JPS6032055Y2 - falling block - Google Patents

Description

[Detailed description of the invention] The present invention relates to a four-link block, and more specifically, a four-link block that can be configured by modifying an existing block so that the rotation of the block can be braked at any point and the suspended load can be stopped at any point. Regarding the ring block.

Generally, an overhead crane is often used to transport heavy or long objects, and the falling block of this overhead crane is constructed as shown in FIG.

That is, FIG. 1 is a front view of a conventional falling block, in which the sheave 1 is connected to the pin 6.
The sheave 1 is attached to the side plate 7 by a wire rope 2, and the sheave 1 is suspended from the sheave main body via a wire rope 2.

Further, the hook 3 is attached to a trunnion 5 via a nut 4, and a ball bearing 9 is inserted between the trunnion 5 and the nut 4, so that the hook 3 can freely rotate.

Further, the trunnion 5 and sheave pin 6 are connected to a side plate 7, and the nut 4 is fixed with a pin 8 so as not to rotate.

However, with a block having this structure, when a long object such as a pipe is suspended and turned, a large force is required to accelerate or decelerate the turning.

For example, in order to decelerate a swing, a worker is often positioned on the forward side of the swing to slow the speed, which can result in the worker being caught between another structure and the crane, which is extremely dangerous. .

In addition, when traveling with a long object suspended, the long object turns freely due to the inclination of the ball bearing 9, wind pressure, etc., and the work under it must be interrupted, which is wasteful.

Furthermore, when lowering a long object onto the ground, it is necessary to return the object to its original state from the swiveled state, which is undesirable as it requires extra work.

In order to solve these problems, it may be possible to brake the hook with some kind of braking force, but this hook is expensive, has a complicated structure, and is large, so it cannot be easily installed on any crane. The problem was that it couldn't be done.

Embodiments of the present invention will be described below with reference to the drawings.

Note that FIG. 2 is a front view showing a cross section of a part of a block according to one embodiment of the present invention, and FIG. 3 is an explanatory view taken from the direction of arrow A--A in FIG.

First, in FIGS. 2 and 3, as in the conventional example shown in FIG. 1, 1 is a sheave, 2 is a wire rope, 3 is a hook, 4 is a nut, 5 is a trunnion, 6 is a sheave pin,
Reference numeral 7 indicates a side plate, 8 indicates a pin, and 9 indicates a ball bearing, and this hook 3 is used to lift a long object. A ball bearing 9 is interposed between them.

Further, the tip of the hook 3 is engaged with a gear mechanism by a nut 4 at the upper part of the ball bearing 9, and the rotational force of the hook is braked by a brake mechanism, which will be described later, via this gear mechanism.

This gear mechanism usually consists of a large gear 10 and a pinion 12, as shown in FIG. 2, and the large gear 10 is fixed to the nut 4 by a fixing bolt 11.

Furthermore, a brake disk 13 is attached to each pinion shaft 12a of each pinion 12 that meshes with the large gear 10 using, for example, a key 14, and a brake coil 15 is provided corresponding to each brake disk 13. is normally attached and fixed to a frame 17 with bolts 16, and the brake disk 13 and brake wheel 15 constitute a brake mechanism.

With this configuration and further connecting the power supply cable 22 to the brake coil 15 of this brake mechanism, the rotation of the hook can be braked by turning the cable 22 on and off, for example, in the crane operating room when lifting a long object. The speed is increased or decelerated.

First, when slinging a long object, etc., turn off the coil supply power in the crane operator's cabin, rotate the hook 3, and sling the long object.

Next, after the slinging is completed, the coil supply power is turned on, and even if the hook rotates in this state, the rotational force is transmitted to the pair of pinions 12 via the large gear 10, and in particular, each brake coil 15 is attached. Brake coil 15
The rotation is braked by a brake mechanism provided from the brake desk 13.

Further, the trunnion 5 is interposed between a pair of side plates 7 as shown in FIG. 20 is connected to the frame 17.

With this configuration, when the hook 3 is rotated, the trunnion 5 is held down without rotating, and furthermore, after the sling is completed and transported to the destination as described above, the coil supply power is turned off and the hook 3 is When you rotate and position the
Long items can be easily transported.

As explained in detail above, the present invention is constructed so that the rotational force of the hook can be braked by a brake mechanism, and since the brake mechanism can be stored extremely compactly, even if it is a normal block, It can be modified without major modification and can be easily attached to a regular hook.

In addition, since the brake mechanism can be attached to the hook with a ball bearing interposed, good meshing of the gears and an appropriate brake gap can be ensured, ensuring smooth rotation when the brake is released.

Furthermore, since the frame is supported between a pair of side plates without being directly fixed to the trunnion, smooth rotation of the large gear of the gear mechanism supported only by ball bearings is guaranteed.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional falling block;
FIG. 2 is a front view showing a cross section of a part of a block according to one embodiment of the present invention, and FIG. 3 is an explanatory view taken from the direction of arrow A--A in FIG. Code 1... Sheave, 2... Wire rope, 3... Hook, 4... Nut, 5
...Trunion, 6...Sheave pin,
7...Side plate, tail...pin, 9
... Ball bearing, 10 ... Large gear, 11.
...Fixing bolt, 12...Each pinion,
12a... Each pinion shaft, 13... Brake desk, 14... Key, 15... Brake coil, 16... Porto, 17 ...Frame, 20...Torque arm, 21...Bracket.

Claims (1)

[Scope of utility model registration request] The sheave 1 is rotatably supported between a pair of side plates 7 via a pin 6, and the hook 3 is attached to the lower part of the side plates 7 via a nut 4 and a trunnion 5. A ball bearing 9 is inserted between the nut 4 and the nut 4, the hook 3 can freely rotate, and the sheave 1 is suspended from the overhead crane via the wire rope 2 in a falling block of a crane. A large gear 10 is fixed to the main gear 10, a gear mechanism in which a pinion 12 is meshed around the large gear 10, and a brake disk 13 is attached to the shaft 12a of the pinion 12.
a brake mechanism to which brake coils 15 are attached so as to correspond to these brake desks 13;
A frame 17 to which the brake coil 15 is fixed, a power supply cable 22 for feeding power to the brake coil 15, and a fixing bolt 1 for fixing the large gear 10 to the nut 4.
0 and a bracket 21 attached to the trunnion 5
and a torque arm 20 that connects the bracket 21 and the frame 17.