JP7517065B2 - Hook block for work machine - Google Patents

Description

The present invention relates to a hook block for a work machine that is equipped with a member that collides with the weight of an over-hoisting prevention device.

Patent Document 1 discloses a configuration in which, when a hook block suspended from the boom of a crane, which is a work machine, is hoisted up, a striker fixed to the hoisting rope collides with the over-hoisting prevention weight of the over-hoisting prevention device, causing the hoisting rope suspending the over-hoisting prevention weight to loosen, activating a limit switch and stopping the hoisting of the hook block.

Utility Model Publication No. 61-44486

As shown in FIG. 8A, which is a front view of the hook device 343, and FIG. 8B, which is a view of FIG. 8A from direction D, in a configuration in which two rod-shaped strikers 302 provided on the upper part of the hook block 301 collide with the weight of the over-hoisting prevention device, a hoisting rope 342 that is wound around the sheave 312 of the hook block 301 is passed between the two strikers 302. However, in this configuration, depending on the angle of the boom and the environment in which the crane is used, the hoisting rope 342 rubs against the striker 302, causing the striker 302 to wear out. For this reason, it was necessary to replace the striker 302 periodically.

The object of the present invention is to provide a hook block for a work machine that can reduce the frequency of replacing parts that collide with the weight of an over-hoisting prevention device.

The present invention is characterized in that it comprises a pair of side plates, a sheave arranged between the pair of side plates and around which a hoisting rope is wound, and a bracket arranged between the pair of side plates and to the side of the sheave, the bracket having an abutment surface that can abut from below against a weight of an overwinding prevention device, the bracket having an opening through which the hoisting rope is inserted, the hoisting rope is inserted through the opening within a range from a position inclined at a first angle in one direction in the fore-aft direction to a position inclined at a second angle in the other direction in the fore-aft direction when the direction in which the pair of side plates face each other and the direction perpendicular to the vertical direction are defined as the fore-aft direction, and the fore-aft length of the range at the upper end of the bracket is longer than the fore-aft length of the bracket.

According to the present invention, the bracket is provided with an abutment surface that can abut against the weight of the over-winding prevention device from below. Therefore, by abutting the abutment surface of the bracket against the weight of the over-winding prevention device, the over-winding prevention device can be activated to stop the winding of the hook device. The bracket is formed with an opening through which the hoisting rope passes. The hoisting rope passes through this opening within a range from a position inclined at a first angle in one direction in the front-rear direction to a position inclined at a second angle in the other direction in the front-rear direction. At the upper end of the bracket, the length of this range in the front-rear direction is longer than the length of the bracket in the front-rear direction. Therefore, the length of the above range in the front-rear direction at the upper end of the bracket is wider than the distance between a pair of strikers in the past. Therefore, even if the hoisting rope rubs against the striker in the past depending on the angle of the boom and the environment in which the crane is used, the hoisting rope is less likely to rub against the bracket. As a result, wear of the bracket, which is a member that collides with the weight of the over-winding prevention device, can be suppressed. This reduces the frequency of replacing the bracket.

FIG. FIG. 2 is a front view of the hook device according to the first embodiment. FIG. 2B is a view of FIG. 2A as seen from direction A. FIG. 2 is a front view of the bracket according to the first embodiment. FIG. 2 is a side view of the bracket according to the first embodiment. FIG. 11 is a front view of a hook device according to a second embodiment. FIG. 4B is a view of FIG. 4A seen from direction B. FIG. 11 is a front view of a bracket according to a second embodiment. FIG. 11 is a side view of the bracket according to the second embodiment. FIG. 13 is a front view of a hook device according to a third embodiment. FIG. 6B is a view of FIG. 6A as seen from direction C. FIG. 13 is a front view of the bracket according to the third embodiment. FIG. 13 is a side view of the bracket according to the third embodiment. FIG. 13 is a front view of a conventional hook device. FIG. 8B is a view of FIG. 8A as seen from direction D.

The following describes a preferred embodiment of the present invention with reference to the drawings.

[First embodiment]
(Crane configuration)
The hook block for a work machine in the first embodiment of the present invention is provided on a crane, which is a work machine. As shown in Fig. 1, which is a side view of a crane 30, the crane 30 is configured such that an upper rotating body 32 is rotatably mounted on a crawler-type lower traveling body 31. Note that the crane 30 may be a mobile crane that uses moving means other than crawlers (for example, wheels), or may be a fixed crane that does not have moving means. In addition, the work machine is not limited to the crane 30.

The upper rotating body 32 has a rotating frame 33, a boom 34, a gantry 36, a lower spreader 38, a hook winch (not shown), a boom raising and lowering winch (not shown), and a counterweight 39.

The swivel frame 33 is attached to the lower carrier 31 via a swivel bearing (not shown). The boom 34 is connected to the front of the swivel frame 33 so that it can be raised and lowered relative to the swivel frame 33. One end of a boom guy line 49 is connected to the tip of the boom 34.

A point sheave 41 is provided at the tip of the boom 34. A hook device 43 is suspended from this point sheave 41 via a hoisting rope 42.

The gantry 36 is attached to the rear of the revolving frame 33. The lower spreader 38 is attached to the upper end of the gantry 36. A boom hoisting rope 51 is hung between the lower spreader 38 and an upper spreader 50 connected to the other end of the boom guy line 49.

The hook winch and the boom hoist winch are each located in the center of the rotating frame 33. The hook winch winds up or pays out the hoisting rope 42 to raise or lower the hook device 43. The boom hoist winch winds up or pays out the boom hoist rope 51 to raise or lower the boom 34 around the boom foot pin, which serves as its fulcrum.

The counterweight 39 is mounted to the rear of the rotating frame 33.

(Configuration of hook block)
As shown in FIG. 2A which is a front view of the hook device 43 and FIG. 2B which is a view from a direction A of FIG. 2A, the hook device 43 has a hook block 1 and a hook 2.

The hook block 1 has a pair of side plates 11. A number of spacers 14 are arranged between the pair of side plates 11. The spacers 14 maintain a predetermined distance between the pair of side plates 11. The spacers 14 are hollow, and a pin 18 is inserted through a hole in the side plate 11, the spacer 14, and then a hole in the side plate 11, thereby connecting the pair of side plates 11 with the spacer 14 in between. As shown in FIG. 2A, four spacers 14 are arranged in a row along the outer periphery of the lower half of the sheave 12, which will be described later.

A trunnion pin 15 and a sheave pin 16 are supported between the pair of side plates 11. The trunnion pin 15 is disposed at the lower end of the side plate 11. The sheave pin 16 is disposed at the center of the side plate 11. The hook 2 is supported by the trunnion pin 15 so that it can rotate and swing freely.

The hook block 1 also has a sheave 12. The sheave 12 is disposed between a pair of side plates 11 and is rotatably supported by a sheave pin 16. A hoisting rope 42 (not shown) is wound around the sheave 12.

The lower half of the sheave 12 is covered by a sheave guard 17. Four spacers 14 are welded to each of the sheave guards 17.

In this embodiment, as shown in FIG. 2B, a notch 17a is formed in the sheave guard 17. This notch 17a is formed in a portion where the lower end of the bracket 13, which will be described later, is located. In this portion, the spacer 14 is divided into two split spacers 14a. A space is formed between the two split spacers 14a in which the lower end of the bracket 13 (the lower end of the plate 22, which will be described later) is located.

The hook block 1 also has a bracket 13. The bracket 13 is disposed to the side of the sheave 12 between the pair of side plates 11. The bracket 13 has a curved shape that follows the outer peripheral surface of the sheave 12.

As shown in FIG. 3A, which is a front view of the bracket 13, the bracket 13 has a pair of first pins 21, a pair of plates 22, and a second pin 23. The front of the bracket 13 is the surface when the hook device 43 is viewed from the direction A in FIG. 2A (see FIG. 2B).

Each of the pair of first pins 21 extends horizontally. A horizontal gap is formed between the pair of first pins 21. This gap forms an opening 25, which will be described later. As shown in FIG. 2B, each end of the pair of first pins 21 fits into a hole 11a provided in the side plate 11. This hole 11a is for fixing a conventional striker.

As shown in FIG. 3A, each of the pair of plates 22 extends in the vertical direction. The upper end of each of the pair of plates 22 is connected to the first pin 21. A gap is formed between the pair of plates 22 in the horizontal direction. This gap forms an opening 25, which will be described later. In the horizontal direction, the width of the gap is larger than the width of the hoisting rope 42.

The second pin 23 extends horizontally. The second pin 23 is inserted into a hole formed in the lower end of each of the pair of plates 22. As shown in FIG. 2B, instead of the pin 18 inserted into the spacer 14, the second pin 23 is inserted through the hole in the side plate 11, the split spacer 14a, the hole in the plate 22, the hole in the plate 22, the split spacer 14a, and the hole in the side plate 11 in that order, connecting the pair of side plates 11.

As shown in FIG. 3B, which is a side view of the bracket 13, each of the pair of plates 22 has a curved shape that follows the outer circumferential surface of the sheave 12. The bracket 13 has an abutment surface 24 facing upward. The abutment surface 24 is formed in the middle of each of the pair of plates 22. The abutment surface 24 can be abutted from below by a weight (not shown) of the overwinding prevention device. The weight of the overwinding prevention device abuts the curved surface of the plate 22, slides along the curved surface, and then abuts the abutment surface 24. By abutting the abutment surface 24 of the bracket 13 against the weight of the overwinding prevention device, the overwinding prevention device can be activated to stop the winding of the hook device 43. The side surface of the bracket 13 is the surface when the hook device 43 is viewed from the front (see FIG. 2A).

As shown in FIG. 3A, an opening 25 is formed in the bracket 13. The opening 25 is a gap above the second pin 23 (the lower end of the plate 22). The hoisting rope 42 is inserted through this opening 25. Here, as shown in FIG. 3B, the direction in which the pair of side plates 11 face each other and the direction perpendicular to the vertical direction are defined as the front-rear direction. The right direction in the figure is defined as the front, and the left direction in the figure is defined as the rear. The hoisting rope 42 is inserted through this opening 25 within a range from a position inclined forward at a first angle θ1 to a position inclined backward at a second angle θ2. In this embodiment, the first angle θ1 and the second angle θ2 are each 30° or more. On the other hand, in a configuration using a conventional pair of strikers 302, the angles corresponding to the first angle θ1 and the second angle θ2 are each about 8° (see FIG. 8A). At the upper end of the bracket 13, the length of this range in the front-rear direction (indicated by an arrow) is longer than the length of the bracket 13 in the front-rear direction. Therefore, the length of the above-mentioned range in the front-rear direction at the upper end of the bracket 13 is wider than the distance between a pair of strikers 302 in the conventional manner. Therefore, even if the hoisting rope 42 rubs against the striker 302 in the conventional manner depending on the angle of the boom 34 and the usage environment of the crane 30, the hoisting rope 42 is less likely to rub against the bracket 13. As a result, wear of the bracket 13, which is the member that collides with the weight of the over-winding prevention device, can be suppressed. This reduces the frequency of replacement of the bracket 13.

(effect)
As described above, according to the hook block 1 of this embodiment, the bracket 13 is provided with the abutment surface 24 that can abut against the weight of the over-winding prevention device from below. Therefore, by abutting the abutment surface 24 of the bracket 13 against the weight of the over-winding prevention device, the over-winding prevention device can be activated to stop the winding of the hook device 43. The bracket 13 is formed with an opening 25 through which the hoisting rope 42 passes. The hoisting rope 42 passes through this opening 25 within a range from a position inclined forward at a first angle θ1 to a position inclined backward at a second angle θ2. At the upper end of the bracket 13, the length of this range in the front-rear direction is longer than the length of the bracket 13 in the front-rear direction. Therefore, the length of the above-mentioned range at the upper end of the bracket 13 in the front-rear direction is wider than the distance between a pair of strikers 302 in the conventional manner. Therefore, even in cases where the hoisting rope 42 rubs against the striker 302 in the conventional case depending on the angle of the boom 34 and the environment in which the crane 30 is used, the hoisting rope 42 is less likely to rub against the bracket 13. As a result, it is possible to suppress wear of the bracket 13, which is a member that collides with the weight of the over-hoisting prevention device. This makes it possible to reduce the frequency of replacing the bracket 13.

The pair of side plates 11 are connected to each other by the second pin 23 of the bracket 13. This allows the number of parts to be reduced compared to providing the pin 18 and bracket 13 separately.

[Second embodiment]
Next, a hook block of a second embodiment will be described with reference to the drawings. Note that the description of the configuration common to the first embodiment and the effects achieved thereby will be omitted, and the description will be focused mainly on the points different from the first embodiment. Note that the same members as those in the first embodiment are given the same reference numerals as those in the first embodiment.

(Configuration of hook block)
In the first embodiment, the second pin 23 of the bracket 13 also serves as the pin 18. In this embodiment, as shown in Fig. 4A which is a front view of the hook device 43, and Fig. 4B which is a view of Fig. 4A from direction B, the bracket 113 of the hook block 101 and the pin 18 are separate bodies.

As shown in FIG. 5A, which is a front view of the bracket 113, the bracket 113 has a pair of first pins 21, a pair of plates 22, a pair of spacers 26, and a third pin 27. The first pins 21 and plates 22 are the same as those in the first embodiment. The front of the bracket 113 is the surface when the hook device 43 is viewed from the direction B in FIG. 4A (see FIG. 4B).

Each of the pair of spacers 26 extends horizontally. The spacers 26 are hollow and are connected around a hole formed in the lower end of the plate 22. This hole is formed above the lower end of the plate 22.

The third pin 27 is inserted through a pair of spacers 26. As shown in FIG. 4B, the third pin 27 is inserted through hole 11c of side plate 11, spacer 26, hole of plate 22, hole of plate 22, spacer 26, and hole 11c of side plate 11 in that order. Hole 11c of side plate 11 is not for passing pin 18 inserted through spacer 14, but is formed above the hole for passing pin 18. The third pin 27 connects the pair of side plates 11 to each other with the pair of spacers 26 and the pair of plates 22 in between. Thus, a predetermined distance can be preferably maintained between the pair of side plates 11.

As shown in FIG. 5B, which is a side view of the bracket 113, the plate 22 has an abutment surface 24 formed thereon, as in the first embodiment. Note that the side surface of the bracket 113 is the surface seen when the hook device 43 is viewed from the front (see FIG. 4A).

Also, as shown in FIG. 5A, an opening 25 is formed in the bracket 113, similar to the first embodiment.

Even with the above configuration, the frequency of replacing the bracket 113 can be reduced.

(effect)
As described above, according to the hook block 101 of this embodiment, the pair of side plates 11 are connected to each other via the spacer 26 of the bracket 113. Therefore, the pair of side plates 11 can be preferably maintained at a predetermined distance from each other.

[Third embodiment]
Next, a hook block of a third embodiment will be described with reference to the drawings. Note that the description of the configuration common to the first embodiment and the effects achieved thereby will be omitted, and the description will be focused mainly on the points different from the first embodiment. Note that the same members as those in the first embodiment are given the same reference numerals as those in the first embodiment.

(Configuration of hook block)
As shown in FIG. 6A which is a front view of the hook device 43, and FIG. 6B which is a view of FIG. 6A from direction C, in this embodiment, the lower end of the bracket 213 of the hook block 201 abuts against the spacer 14.

As shown in FIG. 7A, which is a front view of the bracket 213, the bracket 213 has a pair of first pins 21 and a pair of plates 222. The first pins 21 are the same as those in the first embodiment. The front of the bracket 213 is the surface when the hook device 43 is viewed from the direction B in FIG. 6A (see FIG. 6B).

Each of the pair of plates 222 extends in the vertical direction. The upper end of each of the pair of plates 222 is connected to the first pin 21. A gap is formed between the pair of plates 222 in the horizontal direction. This gap forms an opening 25.

The lower end of each of the pair of plates 222 is in contact with the spacer 14. Therefore, when the contact surface 24 of the bracket 213 is in contact with the weight of the overwinding prevention device, part of the load of the weight can be received by the spacer 14. This reduces the load on the bracket 213.

As shown in FIG. 7B, which is a side view of the bracket 213, the pair of plates 222 are each formed with an abutment surface 24. The abutment surface 24 is the same as in the first embodiment. Note that the side surface of the bracket 213 is the surface when the hook device 43 is viewed from the front (see FIG. 6A).

Also, as shown in FIG. 7A, an opening 25 is formed in the bracket 213, similar to the first embodiment.

Even with the above configuration, the frequency of replacing the bracket 213 can be reduced.

(effect)
As described above, according to the hook block 201 of this embodiment, the lower end of the bracket 213 abuts against the spacer 14. Therefore, when the abutment surface 24 of the bracket 213 abuts against the weight of the over-winding prevention device, a part of the load of the weight can be received by the spacer 14. This makes it possible to reduce the load applied to the bracket 213.

Although the embodiments of the present invention have been described above, they are merely illustrative examples and do not limit the present invention, and the specific configurations and other aspects can be modified as appropriate. Furthermore, the actions and effects described in the embodiments of the invention are merely a list of the most suitable actions and effects resulting from the present invention, and the actions and effects of the present invention are not limited to those described in the embodiments of the present invention.

REFERENCE SIGNS LIST 1, 101, 201 Hook block 2 Hook 11 Side plate 12 Sheave 13, 113, 213 Bracket 14 Spacer 15 Trunnion pin 16 Sheave pin 17 Sheave guard 18 Pin 21 First pin 22, 222 Plate 23 Second pin 24 Abutment surface 25 Opening 26 Spacer 27 Third pin 30 Crane 31 Lower running body 32 Upper rotating body 33 Rotating frame 34 Boom 36 Gantry 38 Lower spreader 39 Counterweight 41 Point sheave 42 Hoisting rope 43 Hook device 49 Boom guy line 50 Upper spreader 51 Boom hoisting rope 301 Hook block 302 Striker 312 Sheave 342 Hoisting rope 343 Hook device

Claims (5)

A pair of side panels;
A sheave disposed between the pair of side plates and around which a hoisting rope is wound;
A bracket disposed on a side of the sheave between the pair of side plates;
having
The bracket has a contact surface that can contact the weight of the overwinding prevention device from below,
The bracket has an opening through which the hoisting rope passes,
When the direction in which the pair of side plates face each other and the direction perpendicular to the vertical direction are defined as front-rear directions,
The hoisting rope is inserted through the opening within a range from a position inclined at a first angle in one direction in the front-rear direction to a position inclined at a second angle in the other direction in the front-rear direction,
A hook block for a work machine, characterized in that at an upper end of the bracket, the length of the range in the fore-aft direction is longer than the length of the bracket in the fore-aft direction. a hollow spacer disposed between the pair of side plates to maintain a predetermined distance between the pair of side plates;
The bracket is
2. A hook block for a work machine as described in claim 1, further comprising a pin that connects the pair of side plates together by being inserted through a hole in the side plate, the spacer, and then a hole in the side plate in that order. The hook block for a work machine according to claim 2, characterized in that the bracket has the spacer. a spacer disposed between the pair of side plates to maintain a predetermined distance between the pair of side plates;
2. The hook block for a work machine according to claim 1, wherein a lower end of said bracket is in contact with said spacer. A pair of side panels;
A sheave disposed between the pair of side plates and around which a hoisting rope is wound;
A bracket disposed on a side of the sheave between the pair of side plates;
having
The bracket is
A pair of plates each having a curved shape along the outer circumferential surface of the sheave and extending in the vertical direction;
a contact surface formed in an intermediate portion of the plate and capable of contacting a weight of an overwinding prevention device from below;
having
A horizontal gap is formed between the pair of plates,
In the horizontal direction, the width of the gap is greater than the width of the hoisting rope,
The upper and lower ends of the plate are fixed to the side plates,
A hook block for a work machine, characterized in that the hoisting rope is inserted through an opening formed by the gap above the lower end of the plate.

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