JPS6330796Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a crane overwind detection system in which a pulley is disposed at the tip of a rotatable boom via a support shaft, and a rope for hoisting equipment is pulled out from the pulley. Regarding equipment.

The overwinding detection device of a crane is a device to avoid a collision before the tip of the boom collides with the hoist. An overwinding detection switch is installed at the tip of the boom, and the overwinding detection switch is activated. A weight that is guided by a rope that suspends the hanging tool and slides into contact with the rope is suspended on the actuator via the rope, and when the weight and the lifting tool come into contact, the overwinding detection switch is activated. I'm trying to get it working.

If the rope that suspends the weight is long, it is likely to get entangled with the rope for the lifting equipment and be damaged; if it is too short, it will not be able to fully perform its function in preventing collisions between the lifting equipment and the boom. Therefore, the length is set to a predetermined length. However, if the position of the overwinding detection switch remains unchanged even if the length of this rope is set to a predetermined length, the rotation angle between when the boom is raised to the maximum and when the boom is lowered to the maximum is not large. There was a problem in that the distance between the position where the weight and the hanging tool abut each other and the tip of the boom varied greatly.

The purpose of this invention is to obtain a new overwinding detection device for cranes that solves this problem. A crane is provided with a pulley from which a rope for hoisting equipment is pulled out, wherein a rocking plate is arranged parallel to the pulley on the support shaft, and the rocking plate has a rocking plate arranged in parallel with the pulley. A rolling element is disposed facing the outer periphery of the pulley across the rope and swings the rocking plate following the direction in which the rope is pulled out from the pulley, and an overwinding detection switch is disposed to detect the overwinding. A detection switch has a weight that is guided by the rope and slides in contact with the rope, suspended via a rope installed in parallel with the rope, and when the weight and the hanging tool come into contact with each other, the overwinding detection switch is activated. The configuration is such that it is activated.

With this configuration, when the boom rotates, the overwinding detection switch rotates together with the rocking plate in the same direction as the pulling out direction of the rope for lifting the hanging equipment, and the overwinding detection switch rotates through the rope from the overwinding detection switch. The relative position between the suspended weight and the tip of the boom remains unchanged, and when the lifting tool and the weight come into contact, an overwinding detection switch is activated.

Next, the present invention will be explained based on a specific embodiment shown in the drawings.

In Figure 1, A is a crane boom,
A base boom 1 whose base end is connected to a swivel base C mounted on a vehicle B so as to be adjustable in elevation, and can rotate along the base boom 1 between a retracted and folded storage position and an unfolded position. It consists of a telescopic folding boom 2 whose proximal end is connected to the distal end of a base boom 1. The telescopic folding boom 2
consists of an outer boom 3 on the base end side, an inner boom 4 on the tip side that is telescopically inserted into the outer boom 3, and a hydraulic cylinder 5 internally disposed between the outer boom 3 and the inner boom 4. There is. The hydraulic cylinder 5 forms a power means for driving the telescopic folding boom 2 to extend and retract. In this embodiment, the base boom 1 includes a base boom body 6, a support tube 7 telescopically inserted into the tip of the base boom body 6,
and a hydraulic cylinder 11 which is internally disposed between the base boom body 6 and the support tube 7 and drives the support tube 7 to extend and retract. In this embodiment, the above-mentioned connection between the tip end of the base boom 1 and the base end of the telescopic folding boom 2 is particularly constructed as follows.
That is, a bracket 8 provided at the base end of the outer boom 3, which is the base end of the telescoping folding boom 2, and a bracket 9 provided at the tip of the support tube 7 of the base boom 1.
are pivotally connected by a shaft 10 and an outer boom 3
The bracket 8 provided at the base end is connected to a bracket 13 provided above the tip of the base boom body 6, which is the tip of the base boom 1, via a connecting rod 12.
The connecting rod 12 and the bracket 13 are connected by a shaft 14, and the connecting rod 12 and the bracket 8 are connected by a shaft 15, respectively. In this embodiment, in which the tip end of the base boom 1 and the base end of the telescopic folding boom 2 are connected in this manner, the rotation of the telescopic folding boom 2 is performed as follows. That is, when the hydraulic cylinder 11 is extended from the storage position where the telescoping folding boom 2 is inverted and folded along the base boom 1 and the support cylinder 7 is extended from the base boom body 6, the brackets 9 and 8 are pivotally connected. The shaft 10 portion moves in the longitudinal direction of the base boom 1. On the other hand, the brackets 13 and 8 are connected by a connecting rod 12, and the distance between the shafts 14 and 15 is kept constant, so as the support tube 7 extends, the telescopic folding boom 2 moves as shown in FIG. Rotate counterclockwise at . The contraction movement of the support cylinder 7 by the hydraulic cylinder 11 causes the telescopic folding boom 2 to rotate clockwise in FIG.

In the figure, 20 is a winch installed on the swivel base C, 21 is a rope wound around the winch 20, and a pulley pivotally supported by the shaft 10 is connected from the winch 20 to the lower side of the base boom 1. 22, the tip of the telescopic folding boom 2 is fixed to the hanger 24 via pulleys 23, 23 arranged opposite to the gooseneck portion 17 at the tip. Reference numeral 25 denotes a support shaft that connects the base end of the base boom 1 to the swivel base C in a freely undulating manner. 26 is a hydraulic cylinder interposed between the base boom 1 and the swivel base C at a proper position.

The crane according to the present invention moves the folding boom 2 in a three-dimensional space by extending and contracting the hydraulic cylinders 5, 11, and 26 to perform cargo handling operations.

Figure 2 shows the gooseneck section 1 at the tip of the inner boom 4.
7 is illustrated. 27 is the spindle 23' of the pulley 23
The swing plate 27 is a substantially triangular plate arranged in parallel on both sides of the pulley 23, and a guide roller 28, which is a rolling element, is attached to the shaft at the end. It is worn. Reference numeral 29 denotes a pin for stopping a rocking plate made up of two plates. The guide roller 28 faces the outer periphery of the pulley 23 with the rope 21 wrapped around the pulley 23 sandwiched between the guide rollers 28 and the rope 21 .
It also serves to prevent the rope from coming off, and also serves to rotate the rocking plate 27 as the line of action of the rope 21 shifts. Note that the swing plate 27 also rotates in the opposite direction due to its own weight.

30 is an overwinding detection switch arranged on one side of the swing plate 27, and an actuator 30' of this overwinding detection switch 30 is guided by the rope 21.
A weight 31 that is in sliding contact with the rope 21 is suspended via a rope 32 that is arranged in parallel with the rope 21.

When the weight 31 and the hanging tool 24 come into contact with each other, the overwinding detection switch 30 is activated and an alarm (not shown) issues an alarm.

As described above, the swing plate 27 freely rotates depending on the rotational posture of the folding boom 2 due to the interference between the rope 21 and the guide roller 28 and due to its own weight, regardless of the bending angle of the folding boom 2. It always tries to be positioned at a constant angle with respect to the suspended rope 21. Therefore, the overwinding detection switch 30 attached to this rocking plate 27 is also connected to the rope 32 on which the weight 31 is suspended.
A certain positional relationship will be maintained with respect to.

Therefore, in this embodiment, the distance between the tip of the boom and the weight is always constant due to the swinging action of the swinging plate 27, and the pulling direction of the actuator 30' and the rope 32 match, so that the folding boom 2 No matter how it is bent, the overwinding detection switch 30 will always be activated, and the overwinding warning function can be effectively performed.

[Brief explanation of the drawing]

Figure 1 is an overall view of a crane showing one embodiment of the invention, Figure 2 is a structural diagram showing the main parts of the invention, and Figure 3 is a structural diagram showing the main parts of the invention.
The figure is a front view of the main part of FIG. 2. 23; Pulley, 21; Rope, 23'; Support shaft, 2
7; Rocking plate, 28; Guide roller (rolling element), 3
0; Overwinding detection switch, 30'; Operator, 31;
Weight, 32; rope.

Claims (1)

[Scope of Claim for Utility Model Registration] A crane in which a pulley is disposed at the tip of a rotatable boom via a spindle, and a rope for hoisting equipment is pulled out from the pulley; A rocking plate is arranged in parallel with the pulley, and the rocking plate is arranged to sandwich the rope, face the outer peripheral edge of the pulley, and follow the direction in which the rope is pulled out from the pulley. A rolling element to be oscillated is arranged, and an overwinding detection switch is also arranged, and a weight that is guided by the rope and slides in contact with the rope is suspended from the overwinding detection switch via a rope installed in parallel with the rope. An overwinding detection device for a crane, characterized in that the overwinding detection switch is actuated when the weight and the hanging tool come into contact with each other.