JP6985644B2 - hook - Google Patents

Description

The present invention relates to a hook mounted on a mobile crane.

Conventionally, various hooks for mobile cranes have been used. Generally, as a hook, a main hook having a sheave inside the hook and used for two hooks or four hooks, a sub hook used for one hook, and the like are used.

Further, for example, Patent Document 1 discloses a configuration in which a detachable retaining bracket provided with a wire retaining bracket is attached to a side plate of a hook. According to this configuration, the wire rope can be removed from the hook device with the cord end attached.

Japanese Unexamined Patent Publication No. 2000-219478

The hook device of Patent Document 1 described above is provided with a spirally formed weight guard (overwinding weight receiver) so that the wire rope can be removed through the gap of the spiral without disassembling the cord end. .. On the other hand, the spirally formed weight guard has a low strength and has a structure that is fixed to the hook device and cannot be removed, so that the weight guard hinders the replacement of the wire rope. was there.

Therefore, the present invention provides a weight guard that has high strength, allows the wire rope to be replaced without disassembling the cord end when the wire rope is replaced, and does not interfere with the replacement. It is intended to provide a hook to prepare.

In order to achieve the above object, the hook of the present invention is rotatably supported via a pair of side plates arranged to face each other, a rotating shaft spanned between the pair of side plates, and the rotating shaft. A second pin that is bridged between the sheave and the pair of side plates and is arranged on one side of the rotation axis in a plan view, and is bridged between the first pin and the pair of side plates. A second pin arranged on the other side of the rotation axis in a plan view, and a first overwinding weight guard for preventing the overwinding weight from coming into contact with the sheave. It is provided with a first overwinding weight guard, which is bridged from the first pin to the second pin.

As described above, in the hook of the present invention, the side plate, the rotating shaft, the sheave, the first pin bridged between the side plates, the second pin bridged between the side plates, and the overwinding weight come into contact with the sheave. It is a first winding overweight guard that prevents this from happening, and includes a first overwinding weight guard that is bridged from the first pin to the second pin. According to such a configuration, the hook has high strength, the wire rope can be replaced without disassembling the cord end, and the replacement is not hindered.

It is a side view of a rough terrain crane. It is a perspective view of a main hook. It is a front view of the main hook. It is a perspective view of the main hook with the overwinding weight guard open. It is a front view of the main hook with the overwinding weight guard open. It is explanatory drawing about the bending of a wire. (A) is a case where the overwinding weight guard of the present invention is used, and (b) is a case where a conventional overwinding weight guard is used.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the components described in the following embodiments are examples, and the technical scope of the present invention is not limited to them.

(composition)
First, the overall configuration of the rough terrain crane 1 as a mobile crane provided with the main hook 30 as the hook of the present embodiment will be described with reference to FIG. In the following embodiment, the rough terrain crane 1 will be described as an example of a mobile crane, but the present invention is not limited to this, and is widely applied to other mobile cranes such as cargo cranes, truck cranes, and all terrain cranes. The invention can be applied.

(Overall configuration of the crane)
As shown in FIG. 1, the rough terrain crane 1 of the present embodiment includes a vehicle body frame 10, outriggers 11, ..., a swivel base 12, a boom 14 attached to a swivel frame upper portion 13 of the swivel base 12, and the like. ing. Further, the rough terrain crane 1 has a hook containment vessel 20 at the front end of the vehicle body frame 10 and below the boom 14 in the traveling posture.

The swivel table 12 has a driver's cab 18 arranged on the front right side, a swivel frame upper part 13 arranged in the rear center, and a counterweight 19 arranged in the rear lower part.

The boom 14 is configured in a nested manner by a base end boom 141, one or more intermediate booms 142, a tip boom 143, and the like, and can be expanded and contracted by an expansion / contraction cylinder arranged inside. A sheave (pulley) is arranged on the state-of-the-art boom head 144 of the tip boom 143, and a wire rope 16 (hereinafter referred to as a wire 16) is hung around the sheave to hang the main hook 30. Although not shown, a sub-hook (80) is also mounted at a predetermined position on the vehicle body frame 10.

The end of the wire 16 is wound around a winch (not shown). Here, the rough terrain crane 1 of this embodiment is equipped with only one winch (not shown). That is, in this embodiment, unlike the conventional case, the wire 16 is commonly used for the sub hook (80) and the main hook 30. Therefore, either the sub hook (80) or the main hook 30 will be replaced and used depending on the work situation.

An undulating cylinder 15 is bridged between the upper portion 13 of the swivel frame and the lower surface of the base end boom 141, and the entire boom 14 can be undulated by expanding and contracting the undulating cylinder 15.

(Hook configuration)
Next, the configuration of the main hook 30 as the hook of this embodiment will be described. As shown in FIGS. 2 and 3, the main hook 30 is via a pair of side plates 31 and 32 arranged to face each other, a rotation shaft 33 bridged between the pair of side plates 31 and 32, and a rotation shaft 33. It is provided with three sheaves 34 to 36 that are rotatably supported and a hook-shaped hacker portion 37 for suspending a load.

The side plates 31 and 32 are formed in an octagonal shape with a long lower portion, and in addition to the rotating shaft 33, the sheaves 34 to 36, and the hacker portion 37, the first pin spanned between the side plates 31 and 32. 41, a wire disconnection prevention pin 42 as a second pin bridged between the side plates 31 and 32, a wire disconnection prevention pin 43 which is a third pin bridged between the side plates 31 and 32, and a side plate 31, Further, a wire disconnection prevention pin 44, which is a fourth pin spanned between the 32, is provided.

The first pin 41 is bridged between the brackets protruding upward from the upper portions of the left and right side plates 31 and 32 so as to be separated from the sheaves 34 to 36 by a predetermined distance. More specifically, the first pin 41 is arranged above one end (corner portion) of the upper side of the octagonal side plates 31 and 32. A first winding weight guard 50 (the first cylindrical portion 51) is rotatably supported on the first pin 41. The configuration of the first overwinding weight guard 50 will be described later.

The three wire disconnection prevention pins 42 to 44 are all installed around the sheaves 34 to 36 in order to prevent the wires 16 from deviating from the sheaves 34 to 36 and to increase the rigidity of the entire main hook 30. More specifically, the wire disconnection prevention pins 42 and 43 are located near the left and right vertical sides of the octagonal side plates 31 and 32 at substantially the same height as the rotating shaft 33 (to be exact, slightly downward). Position). Further, the wire disconnection prevention pin 44 is located at a position downward from the center of the octagonal side plates 31 and 32, and is arranged between the rotation shaft 33 of the sheaves 34 to 36 and the rotation shaft 39 of the hacker portion 37. There is. The wire disconnection prevention pins 42 to 44 are all designed so that bolts can be inserted into the inside, and the wires 16 can be easily removed / attached to the side plates 31 and 32 when the wire 16 is replaced. Has been done.

(Structure of overwinding weight guard)
The first overwinding weight guard 50 is a member attached to prevent the overwinding weight 38 from coming into direct contact with the sheaves 34 to 36. The overwinding weight 38 is suspended from the boom head 144 via a chain, and the wire 16 is inserted therein. Then, the wire 16 is held at a predetermined height below the boom head 144, and when the wire 16 is wound up and the upper part of the hook (main hook or sub-hook) comes into contact (collision) from below, this is detected and the winding operation is stopped. It is configured as follows.

The first overwinding weight guard 50 of the present embodiment is bridged from the first pin 41 spanned between the side plates 31 and 32 to the wire disconnection prevention pin 42 as the second pin. Specifically, the first overwinding weight guard 50 includes a first cylindrical portion 51 through which the first pin 41 is inserted, an arm portion 52 bent along the outer shape of the side plate 32 of the main hook 30, and an arm portion 52. A second cylindrical portion 53 through which a wire disconnection prevention pin 42 is inserted is provided.

The first cylindrical portion 51 is formed in a cylindrical shape, and by inserting the first pin 41, the entire first winding overweight guard 50 can rotate around the first cylindrical portion 51. It has become. An arm portion 52 is projected from the side surface of the first cylindrical portion 51.

The arm portion 52 is bent in parallel with the upper edge of the side plate 32 while leaving a gap for passing the wire 16 between the arm portion 52 and the second overwinding weight guard 60 of the upper edge of the side plate 32, which will be described later. In other words, the arm portion 52 is bent twice and is composed of three straight portions, a horizontal portion, an inclined portion, and a vertical portion. One end of the arm 52 is attached to the first cylindrical portion 51 described above, and the other end is attached to the second cylindrical portion 53 described later.

The second cylindrical portion 53 is formed in a cylindrical shape, and a wire disconnection prevention pin 42 as a second pin is inserted therethrough. Therefore, the second cylindrical portion 53 is released from the fixed state by removing the wire disconnection prevention pin 42. An arm portion 52 is projected from the side surface of the second cylindrical portion 53.

As described above, since the wire disconnection prevention pin 42 as the second pin is configured to be easily removable, as shown in FIGS. 4 and 5, the wire disconnection prevention pin 42 can be removed to obtain a second pin. The cylindrical portion 53 is opened so that the arm portion 52 and the second cylindrical portion 53 can rotate around the first pin 41 (the same applies to the first cylindrical portion 51).

Therefore, when the wire 16 is replaced, all the wire disconnection prevention pins 42 to 44 including the wire disconnection prevention pin 42 are removed, and the arm portion 52 and the second cylindrical portion 53 are moved upward with the first cylindrical portion 51 as the center. By rotating the wire by about 50 to 60 degrees, the sheaves 34 to 36 can be accessed from the front of the main hook 30 to facilitate work. That is, by removing the second wire disconnection prevention pin 42 and rotating the arm portion 52 upward, as shown in FIG. 5, obstacles are completely eliminated in the vicinity of the front surface of the sheaves 34 to 36.

In addition, the side plate 32 is provided with a rod-shaped second overwinding weight guard 60 along the upper edge of the octagonal side plate 32. That is, the second winding overweight guard 60 is arranged substantially in parallel with the above-mentioned first winding overweight guard 50, and is between the first winding overweight guard 50 and the second winding overweight guard 60. The wire 16 is inserted through the wire 16.

The width of the gap formed between the first overwinding weight guard 50 and the second overwinding weight guard 60 is wider than the thickness of the wire 16 so that the wire 16 can move smoothly, and the overwinding weight is widened. It is formed so as to be narrower than the size of the overwinding weight 38 so that the 38 does not pass through.

(effect)
Next, the effects of the main hook 30 as the hook of this embodiment will be listed and described.

(1) As described above, the main hook 30 as a hook of the present embodiment includes a pair of side plates 31 and 32 arranged to face each other and a rotating shaft 33 spanned between the pair of side plates 31 and 32. , The sheaves 34 to 36 rotatably supported via the rotation shaft 33, the first pin 41 bridged between the pair of side plates 31 and 32, and the second pin spanned between the pair of side plates 31 and 32. The wire disconnection prevention pin 42 as a pin and the first overwinding weight guard 50 for preventing the overwinding weight 38 from coming into contact with the sheaves 34 to 36, as the first pin 41 to the second pin. It is provided with a first overwinding weight guard 50, which is bridged to the wire disconnection prevention pin 42 of the above. With such a configuration, it is possible to prevent the overwinding weight 38 from coming into direct contact with the sheaves 34 to 36. Further, since the first overwinding weight guard 50 has a structure in which both ends thereof are bridged from the first pin 41 to the wire disconnection prevention pin 42 as the second pin, one end thereof is supported in a cantilever shape. The strength is significantly higher than that of the conventional weight guard.

Conversely, since the first overwinding weight guard 50 has a structure in which both ends thereof are bridged from the first pin 41 to the wire disconnection prevention pin 42, the arm portion 52 may be longer than before. become able to. Therefore, in a state where the main hook 30 around which the wire 16 is hung is housed in the hook containment vessel 20, the bending angle of the wire 16 can be minimized. That is, the winding overweight guard 50 is better when the winding overweight guard 50 of the present invention shown in FIG. 6A is used than when the conventional overwinding weight guard 50 shown in FIG. 6B is used. The bending angle of the wire 16 becomes smaller due to the long extension of the wire 16.

(2) Further, the first overwinding weight guard 50 is rotatably supported via the first pin 41, and can be rotated by removing the wire disconnection prevention pin 42 as the second pin. It is configured to be openable. With such a configuration, when the wire 16 is replaced, the wire 16 can be replaced without disassembling the cable end , and the main hook 30 does not interfere with the replacement. ..

That is, by rotating the first overwinding weight guard 50, the wire 16 can be hung around the sheaves 34 to 36 without disassembling the cord end. Further, since there are no obstacles in front of the main hook 30 housed in the hook containment vessel 20, the wire 16 can be replaced from the front of the main hook 30.

(3) Further, by further providing a second overwinding weight guard 60 fixed along the upper edge of the side plate 32 substantially parallel to the first overwinding weight guard 50, the first overwinding weight guard is provided. The wire 16 can be passed between the 50 and the second overwinding weight guard 60. Therefore, it is possible to prevent the wire 16 in contact with the upper edge (corner portion) of the side plate 32 from being rubbed and damaged by friction.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes to the extent that the gist of the present invention is not deviated are made in the present invention. included.

For example, in the embodiment, an example of rotating with the first pin 41 located relatively upward as a fulcrum has been described, but the present invention is not limited to this, and the second pin located relatively downward is not limited to this. It can also be configured to rotate around the (wire disconnection prevention pin) 42 as a fulcrum.

1: Rough terrain crane;
20: Containment vessel;
30: Main hook (hook);
31, 32: Side plate; 33: Rotating shaft; 34 to 36: Sheave; 38: Overwinding weight;
41: 1st pin; 42: Wire disconnection prevention pin (2nd pin);
50: First winding overweight guard;
51: 1st cylinder part; 52: Arm part; 53: 2nd cylinder part;
60: Second winding overweight guard;

Claims (3)

A pair of side plates arranged facing each other,
A rotating shaft spanned between the pair of side plates and
A sheave that is rotatably supported via the rotating shaft,
A first pin that is bridged between the pair of side plates and is arranged on one side of the rotation axis in a plan view .
A second pin that is bridged between the pair of side plates and is arranged on the other side of the rotation axis in a plan view .
A first overwinding weight guard that prevents the overwinding weight from coming into contact with the sheave, the first overwinding weight guard that is bridged from the first pin to the second pin.
Equipped with a hook. The first overwinding weight guard is rotatably supported via the first pin, and is configured to be rotatable and openable by removing the second pin. The hook described in 1. The hook according to claim 1 or 2, further comprising a second overwinding weight guard that is fixed along the upper edge of the side plate substantially parallel to the first overwinding weight guard.

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