JP2004067347A - Mobile working machine and its method for attaching and detaching counterweight - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile crane capable of attaching and detaching a counterweight easily in short time even at a place where there is a height limitation without need for high lift work on a boom. <P>SOLUTION: An arm 24 which is rotated by an arm operating cylinder and which includes a guide sheave 26 at the end of the arm 24 is provided on a gantry 10 at the upper side of a boom supporting bracket 6 protruded at a swing frame 5 of the mobile crane. A first guide sheave 21 and a second guide sheave 22 are mounted on the upper end surface of the boom supporting bracket 6, and a third guide sheave 23 is mounted on the swing frame 5. A weight lifting rope 29 of which one end connects to the counterweight is hung by the guide sheave 26, the first, the second, and the third sheaves 21, 22, 23. The weight lifting rope 29 is hung on a hook 7a and is pulled by a main hoisting winch 11. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to the technical field of a self-propelled work machine capable of attaching and detaching a counterweight by itself and a method of attaching and detaching the counterweight.
[0002]
[Prior art]
For example, when moving a crane that is a self-propelled work machine to the work site, if the total weight of a large crane exceeds the specified weight specified in the Road Vehicle Transportation Act, the total weight should be within the specified weight. There must be. In this case, the counterweight is removed before moving, and the crane vehicle from which the counterweight has been removed is moved by self-propelled or transported. In accordance with this movement, the removed counterweight is transported by a truck or the like, and after arriving at the destination, the counterweight is attached to the crane vehicle.
[0003]
By the way, a separate crane must be used for attaching and detaching the counterweight, so that there are the following problems.
{Circle around (1)} In particular, it is difficult to adjust the position when the counterweight is mounted, and it takes a long time.
{Circle around (2)} It is disadvantageous with respect to the cost of attaching and detaching the counterweight.
A crane capable of solving the above-described problem has been proposed in, for example, JP-A-2002-46982. This crane is provided with a weight attaching / detaching device which can attach / detach the counterweight in a short time without using another crane.
[0004]
Hereinafter, the crane according to the conventional example will be described in more detail with reference to FIG. That is, a gantry 58 that is rotatably supported by a boom foot pin 55 that supports a boom 54 and that is fixed to the boom support frame 53 at a predetermined angle is supported by a boom support frame 53 provided on the turning frame 52. Is provided. Further, on a gantry frame 59 of the gantry 58, there is provided a rotating arm 62 having a guide sheave 63 which is rotatably and fixedly supported by a shaft 60 and on which a connecting rope 65 for attaching and detaching the counterweight 56 is hung. Is provided.
[0005]
One end of the connecting rope 65 is detachably connected to a bracket (not shown) provided at the tip of the boom 54 by a pin, and the other end is detachably connected to the counterweight 65 via a connecting metal. Has become. In this state, the gantry 58 is fixed to the turning frame 52 with the connecting pin 61, and the rotating arm 62 is fixed to the gantry 58 with the connecting pin 64 with the guide sheave 63 facing the boom foot pin 55 side. It is configured to be stored. Reference numeral 57 denotes a backstop.
[0006]
When mounting the counterweight 56 with this weight attaching / detaching device, first, the counterweight 56 separately fed by the truck is moved to a predetermined position by a crane, and the upper revolving unit 51 is turned 180 °. When the angle of the boom 54 is set to, for example, 40 °, the angle between the gantry 58 and the boom 54 becomes a predetermined angle. At this predetermined angle, the gantry 56 is fixed to the boom 54 by the connecting pin 61. Further, the turning arm 62 is turned, and the connecting pin 64 fixes the turning arm 62 to be straight with the gantry 58.
[0007]
Then, the boom 54 is tilted to the maximum lying state, one end of the connecting rope 65 is connected to the distal end of the boom 54, and the other end is guided to the base end of the boom 54. To the counterweight 56 located behind the vehicle. After the connection rope 65 has been set, the boom 54 is erected so that the undulation angle is 40 ° and is extended by a predetermined length. Is lifted. When the boom 54 is tilted to the maximum lying state, the rotating arm 62 stands up, so that the lifted counterweight 56 moves to a position above the weight attachment portion 66 provided at the rear of the turning frame 52. Next, when the boom 54 is contracted, the counterweight 56 descends and is attached to the weight attachment portion 66.
[0008]
When the mounting work of the counterweight 56 is completed in this manner, the connecting rope 65 is removed, the connection between the gantry 58 and the boom 54 is released, and the gantry 58 is fixed to the revolving frame 52 by the connecting pin 61 which has been removed for the release. I do. Next, the rotation arm 62 is rotated so that the guide sheave 63 is on the boom foot pin 55 side, and the rotation arm 62 is fixed to the gantry frame 59 by the connecting pin 64 pulled out for rotation and stored. . With the above operation, the crane is in a state where it can perform normal lifting work. When removing the counterweight 56 from the turning frame 52, the operation is performed in the reverse order of the above-described operation procedure.
[0009]
[Problems to be solved by the invention]
According to the crane according to the conventional example described above, the counterweight can be attached and detached by itself, which is considered to be extremely useful. However, there are the following problems to be solved.
(1) Since it is necessary to extend the boom, it is difficult to attach / detach the counterweight in places with height restrictions.
{Circle around (2)} There are many work processes, and the work of attaching and detaching the counterweight is troublesome, and it takes a long time.
[0010]
Accordingly, it is an object of the present invention to provide a self-propelled work machine and a counterweight attachment / detachment method capable of attaching / detaching a counterweight easily and in a short time even in a place where height is limited without performing work at a high place. Is to provide a way.
[0011]
[Means for Solving the Problems]
Means for Solving the Problems The present invention has been made in view of the above circumstances, and in order to solve the above problems, means employed by the self-propelled work machine according to claim 1 of the present invention includes a lower traveling body, Self-propelled work with a detachable counterweight mounted on this lower traveling structure and an upper revolving structure equipped with an up-and-down boom with a hook raised and lowered by a winch suspended at the tip The machine is characterized in that a weight attaching / detaching device which is operated via a hook operated by the winch and which raises / lowers the counterweight is provided on the upper revolving superstructure.
[0012]
Means adopted by the self-propelled work machine according to claim 2 of the present invention includes a lower traveling body, a detachable counterweight is provided on the lower traveling body, and a hook that is raised and lowered by a winch has a tip. A self-propelled work machine equipped with an upper revolving structure provided with an up-and-down movable boom suspended on the upper revolving structure, the upper revolving structure being actuated via the hook by either expansion or contraction of the boom or up and down. A weight attaching / detaching device for raising and lowering the counterweight is provided.
[0013]
The means adopted by the self-propelled work machine according to claim 3 of the present invention is the self-propelled work machine according to any one of claims 1 and 2, wherein the weight attaching / detaching device is provided with the hook Characterized in that it is provided with a power conversion means for converting the above operation into an operation of raising and lowering the counterweight.
[0014]
The means adopted by the self-propelled work machine according to claim 4 of the present invention is the self-propelled work machine according to claim 3, wherein the power conversion means has one end connected to the counterweight, A weight elevating rope whose end is detachably connected to the hook, and guide means for guiding the weight elevating rope in a lower direction of the boom are provided.
[0015]
The means adopted by the self-propelled work machine according to claim 5 of the present invention is the self-propelled work machine according to claim 4, wherein the power conversion means has a base end pivotally attached to the upper revolving unit, It is characterized by comprising a rotatable arm provided with a guide sheave on which the weight elevating rope is hung at the tip.
[0016]
The means employed by the self-propelled work machine according to claim 6 of the present invention is the self-propelled work machine according to claim 5, wherein the arm prevents the weight lifting rope from being excessively wound on the arm. Is provided.
[0017]
The means adopted by the method for attaching and detaching the counterweight of the self-propelled work machine according to claim 7 of the present invention is provided with a detachable counterweight and an up-and-down free-hanging mechanism in which a hook that is raised and lowered by a winch is hung at the tip. In the method for attaching / detaching a counterweight of a self-propelled work machine having a boom, a weight lifting / lowering rope having one end connected to the counterweight is guided in a lower direction of the boom, and the other end of the weight lifting / lowering rope is connected to the counterweight. After being hooked, the counterweight is raised and lowered by at least one of a winch hoisting operation, a hoisting operation, a boom extension operation and an undulation operation, and is attached and detached.
[0018]
According to the self-propelled work machine according to the first to sixth aspects, or the counterweight attaching / detaching method of the self-propelled work machine according to the seventh aspect, the counterweight is raised and lowered via the hook located below the boom. be able to. Therefore, it is not necessary to work on the boom when attaching and detaching the counterweight, and the counterweight can be attached and detached without extending the boom. Also, since any one of the winch hoisting operation, the lowering operation, the extension / retraction operation of the boom, and the undulating operation may be performed, the attaching / detaching operation of the counterweight is easy, and the attaching / detaching operation of the counterweight can be performed in a short time. Can be finished.
[0019]
When the counterweight is raised or lowered via a hook by a winch hoisting or lowering operation, a main winding or an auxiliary winding rope is wound around a plurality of sheaves provided on a boom head. Therefore, since the hook can be finely operated, the position of the counterweight can be easily adjusted to the mounting position, and the counterweight can be easily handled even if the counterweight is heavy. Further, according to the self-propelled work machine according to the sixth aspect of the present invention, since the overwinding prevention device is provided, the rope for lifting the weight can be prevented from being overwound and the counterweight can be safely attached and detached. It can be performed.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a self-propelled working machine according to an embodiment of the present invention will be described with reference to the accompanying drawings, taking a case where the self-propelled working machine is a self-propelled crane as an example. FIG. 1 is an overall side view of a self-propelled crane, FIG. 2 is an explanatory diagram of a main part configuration of an upper revolving structure of the self-propelled crane, omitting an operator cab and guards, and FIG. 1 is an overall side view of a self-propelled crane showing an example of a mounted state.
[0021]
Reference numeral 1 shown in FIG. 1 is a self-propelled crane according to the present embodiment. The self-propelled crane 1 includes a lower traveling body 2 of a crawler traveling type. On the lower traveling body 2, an upper rotating body 4 that rotates around a vertical axis via a rotating bearing 3 is mounted. Have been. The upper swing body 4 includes a swing frame 5 having a boom support frame 6, a boom 7 which is connected to the boom support frame 6 via a boom foot pin 6 a, and which can be raised and contracted and is extendable, and a swing frame. 5 comprises an operator's cab 8 mounted on the front side and a counterweight 9 mounted on the rear side of the turning frame 5. The main hook 7a for hanging a suspended load is provided vertically at the end of the boom 7.
[0022]
The boom support frame 6 of the self-propelled crane 1 having such a configuration has a gantry 10 projecting in the direction of the counterweight 9 at a position above the counterweight 9. Further, a weight attachment / detachment device 20 which is used when attaching / detaching the counterweight 9 and which will be described later is provided between the gantry 10 and the boom support frame 6.
[0023]
The weight attachment / detachment device 20 has one end side detachably connected to connection brackets (not shown) provided at two places above the counterweight 9 via a connection fitting (not shown) such as a shackle. (See FIG. 2 only one, but actually two) weight lifting ropes 29 in which a ring-shaped hook formed on the main hook 7a is detachably mounted. I have.
Further, the weight attaching / detaching device 20 is provided with a power conversion unit having a configuration described below, which converts the operation of the main hook 7a into the lifting / lowering operation of the counterweight 9 via the weight lifting / lowering rope 29.
[0024]
The power conversion means includes two weight lifting ropes 29 and a plurality of guide sheaves as guiding means for guiding the weight lifting rope 29 in a lower direction of the boom 7, that is, in a direction of the main hook 7a. I have. These guide sheaves are a first guide sheave 21, a second guide sheave 22 provided at the upper end of the boom support frame 6, and a third guide sheave provided on the front side of the boom support frame 6 of the turning frame 5. 23. The first, second, and third guide sheaves 21, 22, and 23 are also provided on a boom support frame on the opposite side of the boom 7 in FIG. Note that the first, second, and third guide sheaves 21, 22, and 23 can be provided on the boom 7 and are not limited to the above positions.
[0025]
The weight attaching / detaching device 20 is rotated by a predetermined angle due to expansion and contraction of a rod of an arm operating cylinder 28 whose bottom side is pivotally attached to the turning frame 5, and is supported by the gantry 10 via an arm connecting pin 25. A pair of arms (only one is shown in FIG. 2) 24 is provided. A horizontal shaft 27 is supported at the distal ends of the pair of arms 24, and a guide sheave 26 on which each of the weight elevating ropes 29 is hung is attached to the shaft 27. These guide sheaves 26 serve to raise the counterweight 9 and to change the direction of the vertical lifting rope 29 together with the first, second, and third guide sheaves 21, 22, and 23 in the forward direction of the turning frame 4. Is what you do.
[0026]
At the tip of the arm 24, an overwinding prevention device 15 for preventing the rope 29 for lifting and lowering the weight from being overwound is provided. It is configured to be able to. In FIG. 2, a main winding winch 11 provided at the rear of the upper swing body 4 and indicated by a broken-line circle on the lower side winds and rewinds a main winding rope 12 for raising and lowering a main hook 7a. is there. An auxiliary winding winch 13 which is shown above the main winding winch 11 by a broken line circle and winds and rewinds an auxiliary winding rope 14 for raising and lowering an auxiliary hook (see FIG. 3) 7b.
[0027]
Hereinafter, a case where the counterweight 9 is mounted on the weight mounting portion 5a provided at the rear of the turning frame 5 by the self-propelled crane 1 having the above configuration will be described with reference to FIGS. First, the self-propelled crane 1 from which the counterweight 9 has been removed is moved to a predetermined position by the counterweight 9 separately sent by the truck, and the upper revolving unit 4 is turned by 180 °.
At this time, the boom 7 is in the minimum contracted state, and the arm 24 is tilted to a horizontal or lower state by the contraction of the rod of the arm operating cylinder 28. Further, the connection fitting of the weight lifting rope 29 is connected to and stored in a fitting storage unit (not shown) provided at the rear of the turning frame 5. Further, the ring-shaped hanging portion side of the weight elevating rope 29 is fixed to the turning frame 5. In this case, the weight elevating rope 29 is permanently provided, but may be set when the counterweight 9 is attached or detached.
[0028]
When the self-propelled crane 1 is in the above-described state, the guide sheave 26, the first guide sheave 21, the second guide sheave 22 provided on the upper end of the boom support frame 6, and the boom support frame of the revolving frame 5 are provided. The connection of the connecting member of the weight elevating rope 29 hung on each of the third guide sheaves 23 provided on the front side of the connecting member to the metal fitting storage portion and the fixing of the ring-shaped hooking portion side are released.
Then, the one end side (the connection metal fitting side) of the weight lifting rope 29 is pulled down, and the connection metal fitting is connected to a connection bracket (not shown) provided on the counterweight 9. Next, the boom 7 is raised to move the main hook 7a near the front of the self-propelled crane 1, and the hook 7a is hung by the ring-shaped hook on the other end of the weight lifting rope 29. The weight lifting rope 29 may be connected to the counterweight 9 after being hung on the main hook 7a, and the order of the rope 29 is not particularly determined.
[0029]
When the above-described setting operation of the weight lifting rope 29 is completed, the main winding winch 11 is operated to extend the rod of the arm operation cylinder 28 while winding the main winding rope 12 so that the tip of the arm 24 faces upward. To rotate. As a result, the counterweight 9 is lifted along an arc trajectory, and when the arm 24 is rotated to the maximum, the counterweight 9 comes directly above the weight mounting portion 5a. Then, if the main winding rope 12 is rewound by the main winding winch 11 while maintaining the maximum rotation position of the arm 24, the counterweight 9 descends by its own weight and engages with the weight mounting portion 5a, thereby turning the turning frame. 5 will be attached.
[0030]
When the mounting work of the counterweight 9 is completed in this way, the rod of the arm operation cylinder 28 is reduced, and the arm 24 is stored. Then, after the main winding rope 12 is wound by the main winding winch 11 to eliminate the slack of the weight lifting / lowering rope 29, the rope is removed from the main hook 7a and fixed to the turning frame 5 by fixing means (not shown). By the above operation, the self-propelled crane 1 is in a state in which a normal hanging load operation can be performed. When removing the counterweight 9 from the turning frame 5, the operation is performed in the reverse order of the above-described operation procedure.
[0031]
By the way, in the above-mentioned method of attaching and detaching the counterweight 9, the case where the counterweight 9 is attached and detached while the boom 7 is standing up has been described. However, when the boom 7 cannot be raised due to the height limitation, the counterweight 9 can be attached and detached while the boom 7 is lying down. For example, one end of the rope or the like is hooked on a fixed object provided on the ground, a truck bed, or the like while the rope or the like serving as the connecting means is hooked on the main hook 7a. Next, the self-propelled crane 1 is moved forward, and the main winding rope 12 wrapped around the sheave of the main hook 7a is rewound to the end of the weight elevating rope 29 of the power conversion means in front of the upper rotating body 4. The main hook 7a is moved to a position where it can be connected. Then, in this state, the main hook 7a and the weight elevating rope 29 are connected. In this way, the main hook 7a can be arranged at a position where the main hook 7a can be connected to the weight elevating rope 29 in a state where tension is applied to the main winding rope 12 by performing the traveling operation of the self-propelled crane 1. Thereafter, the vehicle moves to a position where the counterweight 9 is connected by running or turning, connects the rear end side of the weight lifting / lowering rope 29 to the counterweight 9, and performs the above-described lifting operation of the counterweight 9.
[0032]
In the above, the case where the main winding winch 11 is used for attaching and detaching the counterweight 9 has been described as an example. However, according to the self-propelled crane 1 according to the present embodiment, the counterweight 9 can be attached to and detached from the rear portion of the turning frame 5 by the following method.
{Circle around (1)} An auxiliary hook (see FIG. 3) 7b which is lifted and lowered by an auxiliary winding rope 14 wound and unwound by an auxiliary winding winch 13 is used.
(2) The hook is operated by the extension operation of the boom 7 or the raising / lowering operation of the boom 7.
Therefore, the present invention is not limited to the counterweight attaching / detaching method according to the above embodiment.
[0033]
Note that the weight lifting rope 29 of the power conversion means can be replaced with a chain or a chain. The guide means may be a roller, a pin, a bent gutter-shaped member other than the sheave, and a sprocket if a chain is used. That is, any member can be used as long as it can efficiently transmit force forward from the counterweight side along the main body of the self-propelled crane by the power conversion means, and the shape is not particularly limited. In addition, when a permanent chain or sprocket is used, only the rear end and front end of the main unit of the self-propelled crane, that is, the connection part with the counterweight and the engagement part with the hook are detachably connected. What is necessary is just to make the structure which can be performed.
[0034]
As described above, according to the self-propelled crane 1 of the present invention, the weight lifting rope 29 previously hung on the guide sheave and the main hook 7a located below the boom 7 are used. The counterweight 9 can be moved up and down to be detached. Therefore, it is not necessary to work on the boom 7 when attaching and detaching the counterweight 9, and the counterweight 9 can be attached and detached without extending the boom 7. Also, any one of the winch hoisting and lowering operations, the boom expansion / contraction operation and the undulating operation may be performed, so that the attaching / detaching operation of the counterweight 9 is simple, and the attaching / detaching of the counterweight 9 in a short time. Work can be completed.
[0035]
When the counterweight is raised or lowered via a hook by a winch hoisting or lowering operation, a main winding or an auxiliary winding rope is wound around a plurality of sheaves provided on a boom head. Therefore, since the hook can be finely operated, the position of the counterweight 9 can be easily adjusted to the position of the weight mounting portion 5a, and in addition, the counterweight 9 can easily cope with a large weight. be able to. Furthermore, since the overwinding prevention device 15 is provided, the weight lifting / lowering rope 29 is not overwound, and the work of attaching and detaching the counterweight 9 can be performed safely. In addition, the tip of the weight lifting rope 29 connected to the counterweight 9 may be hooked on, for example, a stake or the like cast on the ground, and the self-propelled crane 1 may be moved forward or backward to raise the counterweight 9.
[0036]
【The invention's effect】
As described above in detail, according to the self-propelled crane according to claims 1 to 6 or the method for attaching and detaching the counterweight of the self-propelled crane according to claim 7, the hook is located on the lower side of the boom. The counterweight can be raised and lowered.
Therefore, it is not necessary to work on the boom when attaching and detaching the counterweight, and the counterweight can be attached and detached without extending the boom. In addition, since any one of the winch hoisting operation, the lowering operation, the boom extension / contraction operation and the undulating operation may be performed, the attaching / detaching operation of the counterweight is easy, and the attaching / detaching operation of the counterweight can be performed in a short time. There is an excellent effect that it can be ended.
[0037]
When the counterweight is raised or lowered via a hook by a winch hoisting or lowering operation, a main winding or an auxiliary winding rope is wound around a plurality of sheaves provided on a boom head. Therefore, since the hook can be finely operated, the position of the counterweight can be easily adjusted to the mounting position, and the counterweight can be easily coped with even when the counterweight is heavy. Furthermore, according to the self-propelled crane according to claim 6 of the present invention, since the overwinding prevention device is provided, the weight lifting rope is not overwound, and the counterweight can be safely attached and detached. An excellent effect that it can be performed can be obtained.
[Brief description of the drawings]
FIG. 1 is an overall side view of a self-propelled crane according to an embodiment of the present invention.
FIG. 2 is an explanatory view of a main part configuration of an upper revolving structure of a self-propelled crane, omitting an operator's cab and guards according to the embodiment of the present invention.
FIG. 3 is an overall side view of a self-propelled crane showing an example of a state in which a counterweight is mounted according to the embodiment of the present invention.
FIG. 4 is an explanatory diagram of a main part configuration of a rear portion of a crane according to a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Self-propelled crane, 2 ... Lower traveling body, 3 ... Revolving bearing, 4 ... Upper revolving body, 5 ... Revolving frame, 5a ... Weight attachment part, 6 ... Boom support frame, 6a ... Boom foot pin, 7 ... Boom , 7a: Main hook, 7b: Supplementary hook, 8: Driver's cab, 9: Counter weight, 10: Gantry, 11: Main winding winch, 12: Main winding rope, 13: auxiliary winding winch, 14: auxiliary winding rope, 15 ... overwinding prevention device 20 ... weight attaching and detaching device, 21 ... first guide sheave, 22 ... second guide sheave, 23 ... third guide sheave, 24 ... arm, 25 ... arm connecting pin, 26 ... guide sheave, 27 ... shaft , 28 ... arm working cylinder, 29 ... weight lifting rope

Claims (7)

An upper revolving structure is provided, which has a lower traveling structure, a detachable counterweight on the lower traveling structure, and an up-and-down movable boom in which a hook raised and lowered by a winch is hung at the tip. A self-propelled work machine, comprising: a weight attaching / detaching device that is operated via a hook operated by the winch and that raises and lowers the counterweight, on the upper revolving superstructure. . An upper revolving structure is provided, which has a lower traveling structure, a detachable counterweight on the lower traveling structure, and an up-and-down movable boom in which a hook raised and lowered by a winch is hung at the tip. In the self-propelled work machine, the upper swing body is provided with a weight attaching / detaching device which is operated via the hook by any of expansion and contraction or undulation of the boom to raise and lower the counterweight. Self-propelled work machine. The self-loading device according to claim 1, wherein the weight attaching / detaching device includes a power conversion unit that converts an operation of the hook into an operation of lifting and lowering the counterweight. A traveling work machine. The power conversion means has one end connected to the counter weight and the other end detachably connected to the hook, and guides the weight elevating rope downwardly of the boom. The self-propelled work machine according to claim 3, further comprising a guide means. The power conversion means is characterized in that the power conversion means comprises a rotatable arm having a base end pivotally attached to the upper revolving structure, and a guide sheave provided with a weight elevating rope at its tip end. The self-propelled work machine according to claim 4. The self-propelled work machine according to claim 5, wherein the arm is provided with an overwind prevention device for preventing the weight lifting rope from being overwound. In the method of attaching and detaching a counterweight of a self-propelled work machine having a detachable counterweight and an up-and-down boom in which a hook raised and lowered by a winch is hung at the tip, one end is connected to the counterweight. The weight lifting rope is guided in the lower direction of the boom, and the other end of the weight lifting rope is hung on the hook, and then the winch is raised, lowered, and the boom extends or retracts or rises and falls. A counterweight attaching / detaching method for a self-propelled working machine, wherein the counterweight is lifted / lowered and attached / detached by at least one of the operations.

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