JP2585657Y2 - Boom tip structure of mobile crane - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boom tip structure of a mobile crane.

[0002]

2. Description of the Related Art As a conventional mobile crane of this type, a mobile crane having a folding boom shown in FIG. 3 will be described below as an example. A mobile crane having a folding boom has a boom 3 mounted on a swivel 2 mounted on a vehicle 1 so as to be able to move up and down. The lower boom 4 has a lower boom 4 attached to the swivel base 2 so as to be able to raise and lower, a folded state in which the abdominal surface is attached to the lower boom 4 so as to be closer to the lower boom 4, and a lower boom 4. On the other hand, it is configured as a folding boom including an upper boom 5 which can be raised and lowered between the extended state and the extended state.

[0003] At the tip of the upper boom 5 of the boom 3 is attached a boom tip 7 having both side plates 6 projecting downward, and the boom tip 7 has a wire guide pulley 8 projecting upward. And a hanging tool pulley 9 protruding below the end 7 of the boom. Lower boom 4
A winch 10 is disposed at the base end of the wire rope 11.
Has been wound. A wire rope locking device 12 for locking the wire rope 11 is disposed at an appropriate position at the tip 7 of the boom.

[0004] Further, there is provided a hanger 15 having a pulley 13 above the pulley 13 and a hook 14 for hanging a suspended load below the pulley 13, and the wire rope 11 from the winch 10 is passed through the wire guide pulley 8. After hanging around the hanging tool pulley 9 and the hanging tool 15 and the locking tool 12, the hanging tool 1 is connected to the boom tip 7 with a plurality of wire ropes 11.
5 is suspended.

[0005] The mobile crane of this kind configured as described above pivots the swivel 2, raises and lowers the lower boom 4, and moves the upper boom 5 forward. The crane works by lowering the drive.

However, the mobile crane has the following problems. That is,
As shown in FIG. 6, when the crane work is performed with the upper boom 5 in a substantially horizontal state, the wire rope 11 hung between the hanging hanging pulley 9 and the wire rope locking tool 12 is D
And the crane work can be performed without the wire rope 11 becoming entangled. However, the upper boom 5 is extended with respect to the lower boom 4 and
When the crane work is performed in the state of FIG. 7 in which the lower boom 4 is raised, the wire rope 11 wrapped between the hanging tool pulley 9 and the wire rope locking tool 12 has a distance of d. 4, the distance becomes narrower than that shown in FIG. 4, and the wire rope 11 becomes entangled during crane operation.

In particular, when suspending the hanging tool 15 from the boom tip 7, if the distance between the boom tip 7 and the hanging tool 15 is increased (for example, the upper boom 5 and the lower boom 4).
Is constructed with a telescopic boom and each boom is extended, etc.), the entanglement easily occurs. Further, when the boom 3 is raised, there is a possibility that the hanger 15 may contact the abdominal surface of each boom, or the abdominal surface of each boom may come into contact with or slightly swing the hanger 15. Was. Therefore, the both side plates 6 of the boom tip 7 may be protruded downward as much as possible, and the hanging tool pulley 9 may be disposed below the boom tip 7. There was a problem.

That is, as shown in FIG. 6, there is a case where the crane operation needs to be performed with the boom 3 of the crane being in a substantially horizontal state under the control of an obstacle present on the upper part. In this case, the boom tip 7, the hanger 15, and the suspended load 16 must be located between the obstacles on the ground and the upper part, and the hanger 15 must be brought into contact with the lower part of the boom tip 7. The wire rope 11 must be wound around the winch 10, and the lower part of the boom tip 7 and the hanging device 15 often collide with each other, and both the winch 10 and the winch 10,
The wire rope 11 and the like were sometimes damaged. An object of the present invention is to provide a new mobile crane that solves the above-mentioned problem.

[0008]

In order to achieve the above object, a mobile crane boom tip structure according to the present invention is provided with a boom mounted on a swivel mounted on a vehicle so as to be able to move up and down, and mounted on the tip of the boom. Boom tip with both side plates protruding downward, a wire guide pulley protruding above the boom tip, a hanging tool pulley disposed below the boom tip, the swivel or the base of the boom. A winch disposed at the end, a wire rope fed out from the winch, a wire rope locking device disposed at an appropriate position at the tip of the boom to lock the wire rope, and a pulley having a pulley thereabove and a suspended load thereunder. A hanging tool having a hook to be suspended is provided, and after the wire rope from the winch has passed through the wire guide pulley, the hanging tool hanging pulley and the hanging tool and In a mobile crane configured to hang around the locking device and suspend the hanging device with a plurality of wire ropes from the end of the boom, the locking device is disposed at the rear ends of the side plates. A hanging tool pulley is provided, and the hanging tool pulley is projected downward from both side plates, and is separated from the locking tool. A swing bracket pivotally supported on the side plate and a fixing device disposed between the side plates and the swing bracket for fixing the swing bracket to the extended position and the retracted position. Things.

[0009]

According to the boom tip structure of the mobile crane of the present invention constructed as described above, the swinging bracket provided with the suspending pulley is swung to project downward from both side plates to separate from the locking fixture. By fixing to the extended position by the fixing device, the distance between the hanging tool pulley and the locking tool can be increased, and the problem of the wire rope getting tangled during the crane operation can be solved. Also, by separating the distance between the hanging pulley and the locking device, the distance between the boom and the abdominal surface of the boom can also be increased.When the boom is raised, the hanging device and the abdominal surface of each boom come into contact. Can be prevented, and the swing of the hanger can be prevented, and the hanger can also be prevented from colliding with the abdominal surface of each boom. Further, even when an obstacle is present at the top and the suspended load must be lifted with the boom in a substantially horizontal state, the swing bracket is swung to be stored in both side plates and fixed by a fixing device. By
The lifting load can be lifted by the height of the swing bracket stored in the both side plates, and the lower part of the boom tip and the lifting tool collide, damaging both the winch, wire rope, etc. Is prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a boom tip structure of a mobile crane according to the present invention will be described below with reference to FIGS. In describing the present invention, a mobile crane having a folding boom as shown in FIGS.
The case where the present invention is implemented will be described below. The present invention differs from the mobile crane having a folding boom shown in FIGS.
Only the configuration of the boom tip 7 is different, and the other parts are the same. Therefore, reference numerals 1 to 16 shown in FIGS. 5 to 7 and described in the related art are used as the same in the following description, and the description is omitted.

In FIG. 1 and FIG. 2, a wire rope stopper 12 is disposed at the rear end of one of the side plates 6 so that the tip of the wire rope 11 is connected to the boom tip 7 at the cable end 1.
It is fastened by a pin 18 via 7. Reference numeral 19 denotes a swing bracket, which is provided with the hanging tool pulley 9 and the side plates 6.
The hanging tool pulley 9 is pivotally supported by a pivot 20 disposed therebetween to project the hanging tool hanging pulley 9 downwardly from both side plates 6.
It is possible to swing between a protruding position separated from the main body and a storage position stored in the both side plates 6.

Reference numerals 21 and 22 denote pin holes provided between the side plates 6, and reference numeral 23 denotes a pin hole provided in the swing bracket 19. Reference numeral 24 denotes a pin that penetrates these pin holes.
That is, as shown in FIG. 1, the pin hole 22 provided between the both side plates 6 and the pin hole 23 provided in the swing bracket 19 are overlapped, and the pin 24 is passed through these pin holes, whereby the swing bracket is formed. The swing bracket 19 is fixed by projecting the hanging tool pulley 9 provided at 19 downward from the both side plates 6 and at a projecting position separated from the locking tool 12.

As shown in FIG. 1, a pin hole 21 provided between the side plates 6 and a pin hole 23 provided in the swing bracket 19 are overlapped, and a pin 24 is passed through these pin holes. The swinging bracket 19 is fixed by positioning the hanging tool pulley 9 provided on the swinging bracket 19 at the storage position stored in the side plates 6. 25 (shown by a dashed line) is composed of the pin holes 21, 22, 23 and the pin 24, and the both side plates 6 and the swing bracket 1
9 is a fixing device that is disposed between the fixing members 9 and fixes the swing bracket 19 to the extended position and the retracted position.

The boom tip structure of the mobile crane thus constructed according to the present invention operates as follows. That is, when the crane work is performed with the upper boom 5 extended with respect to the lower boom 4 and the lower boom 4 raised with respect to the swivel 2, the swing bracket 19 is extended as shown in FIG. The crane work may be performed with the swing bracket 19 being fixed to the extended position by the fixing device 25 at the extended position. In this state, even if the lower boom 4 is raised, the distance between the wire rope 11 wrapped around the hanging tool pulley 9 and the wire rope locking tool 12 is large, and the wire rope 11 is entangled. Crane work without the need.

Next, when the crane operation must be performed with the crane boom 3 in a substantially horizontal state under the control of an obstacle present at the top, the swing bracket 19 is moved to the storage position as shown in FIG. And the crane work may be performed with the swing bracket 19 fixed to the storage position by the fixing device 25. In this state, it is possible to lift the suspended load 16 by the height of the swing bracket 19 stored in the both side plates 6, so that the lower part of the boom tip 7 and the suspender 15 collide with each other. It is possible to prevent both of them from being damaged or the winch 10 and the wire rope 11 from being damaged.

As described above, the conventional problem can be solved by appropriately positioning the swinging bracket 19 in the extended position and the retracted position according to the content of the crane operation. In the above-described embodiment, the case where the present invention is applied to a mobile crane having a folding boom has been described. In this case, if the swinging bracket 19 is stored and the upper boom 5 and the lower boom 4 are folded, the upper boom can be folded. 5 and the lower boom 4 can be folded close to each other, so that there is an effect that the height of the swivel base 2 can be reduced accordingly and the overall height of the mobile crane during traveling movement can be reduced.

Next, in the above embodiment, the hanger 15 is suspended from the boom tip 7 by two wire ropes 11 (so-called two hooks), but two or more wires are used. The hanging tool 15 may be hung by the rope 11.
For example, as shown in FIGS. 3 and 4, two hanging tool hanging pulleys 9 are arranged on the swing bracket 19, and two pulleys 13 are also arranged on the hanging tool 15, and the wire rope locking tool 12 is provided. The pulley 26 is disposed here without simply fixing the tip of the wire rope 11, and the tip of the wire rope 11 is fixed to an appropriate position in both side plates 6 of the boom tip 7 as a so-called four hook. Good. In this case, the pulley 26 is pivotally supported by a bracket 27 so as to be orthogonal to the hanging tool pulley 9, and the bracket 27 is swingable at the rear ends of the both side plates 6 of the boom tip 7 in the direction of the locus of the boom. Should be supported on

The embodiment shown in FIG. 1 is provided with an overwinding prevention device. That is, this overwinding prevention device includes an overwinding detection switch 29 disposed in both side plates 6 of the boom tip portion 7, a rope 30 having one end connected to the overwinding detection switch 29, and an other end of the rope 30. A suspended weight 31 is provided. The weight 31 has the wire rope 11 penetrated therein, and when the lifting device 15 is lifted up together with the lifting device 15, the winding detection switch 29 operates to move the lifting device 15 to the boom tip 7.
Is alerted to approaching the lower part of the vehicle, and the driving of the winch 10 is stopped to prevent the hanging tool 15 from hitting the lower part of the boom tip 7.

In particular, in the overwinding prevention device shown in FIG. 1, the rope 30 is passed through a small pulley 32 which is juxtaposed on a swing bracket 19 on the pivot of the hanging tool pulley 9. Therefore, when the swing bracket 19 is in the extended position, the length of the rope 30 from the lower end 7 of the boom to the weight 31 is shortened, and when the swing bracket 19 is in the retracted position,
The length of the rope 30 from the lower end 7 of the boom to the weight 31 is increased. That is, except for the crane operation illustrated in FIG. 2, in general, when the swing bracket 19 is set in the extended position for the purpose of preventing the hanging tool 15 from coming into contact with the boom even when the boom is raised. When the swing bracket 19 is in the retracted position, it is mostly one hook (in this case, the hanging tool 33 uses a single hanging tool 33). Therefore, the hoisting speed of the hanger 15 is slower in the case of two hooks than in the case of one hanger.
Since the winding speed of the rope 30 is high, the length of the rope 30 must be adjusted. However, the length of the rope 30 can be adjusted by swinging the swing bracket 19 at the same time. It is designed to eliminate the need for adjustment.

Further, in the above embodiment, the case where the present invention is applied to a mobile crane having a folding boom has been described. However, it is needless to say that the present invention can be applied to a mobile crane having no folding boom.

Advantageous Effects of the Invention The boom tip structure of the mobile crane according to the present invention, which is constructed and operated as described above, separates the distance between the suspension hanging pulley and the locking member by setting the swing bracket to the extended position. This can prevent the wire rope from becoming entangled during the crane operation, and prevent the lifting tool from coming into contact with or hitting the abdominal surface of each boom when the boom is raised.
Further, even in the case where an obstacle is present at the top and the boom needs to be lifted with the boom in a substantially horizontal state, the storage position of the swing bracket allows the swing bracket to be stored in the side plates. It is possible to lift a suspended load by only the height of the object, which is very effective.

[Brief description of the drawings]

FIG. 1 is an explanatory view illustrating a boom tip structure of a mobile crane according to the present invention, and is an explanatory view illustrating a case where a swing bracket is in an extended position.

FIG. 2 is an explanatory view illustrating a boom tip structure of the mobile crane according to the present invention, and is an explanatory view illustrating a case where a swing bracket is in a retracted position.

FIG. 3 is an explanatory view illustrating a boom tip structure of the mobile crane according to the present invention, and is an explanatory view illustrating an advanced example.

4 is a view as viewed in the direction of the arrow X in FIG. 3;

FIG. 5 is an explanatory view illustrating a mobile crane having a folding boom.

FIG. 6 is an explanatory view showing a crane operation with a boom in a horizontal state using a conventional mobile crane.

FIG. 7 is an explanatory view of a conventional mobile crane performing crane operation with the boom raised.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle 2 Turntable 3 Boom 6 Both side plates 7 Boom tip 8 Wire guide pulley 9 Hanging device pulley 10 Winch 11 Wire rope 12 Wire rope locking device 13 Pulley 14 Hook 15 Hanging device 19 Swing bracket 25 Fixing device

Claims (1)

(57) [Scope of request for utility model registration] 1. A boom mounted on a swivel mounted on a vehicle so as to be able to move up and down, a boom tip mounted on a tip of the boom and having both side plates protruding downward, and a boom protruding above the boom tip. A wire guide pulley, a hanger hanging pulley arranged below the tip of the boom, a winch arranged at the base end of the swivel or the boom, a wire rope fed out from the winch, and a tip arranged at an appropriate position at the tip of the boom. A wire rope locking device for locking a wire rope, and a hanging device having a pulley above the hook and a hook for hanging a suspended load below the pulley are provided, and the wire guide from the winch is connected to the wire guide pulley. After the passage, the hanging tool is hung on the hanging tool pulley and the hanging tool and the locking tool, and the hanging tool is hung by a plurality of wire ropes from the end of the boom. In the mobile crane configured as described above, the locking tool is arranged at the rear end of the side plates,
A hanging tool pulley is provided between the two side plates at a projecting position where the hanging tool hanging pulley projects downward from both side plates and is separated from the locking tool and a storage position stored in the both side plates. A movement, comprising: a swing bracket pivotally supported pivotally; and a fixing device disposed between the side plates and the swing bracket to fix the swing bracket to the extended position and the retracted position. Boom tip structure of a mobile crane.