JP2001158590A - Entanglement preventing device for hoisting wire of crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent entanglement of a hoisting wire of a back side winch without causing a weight increase of a gantry and a cost increase of this device by complication of its structure. SOLUTION: This entanglement preventing device 11 for a hoisting wire, which is attached to a gantry 5 correspondingly to at least one winch 6B, comprises a sheave 15 to guide the hoisting wire 9BD of the winch by supporting it on a lateral shaft 17 attached to the gantry, a lateral rod body 16 attached to the gantry at an upper position near the sheave, and an upward and downward sliding means to support the sheave and the lateral rod body movably in the direction of the upper and lower shafts of the gantry by following the locus of the hoisting wire shifting in the upward and downward direction of a crane body by the change of a boom derricking angle. In addition, it is structured by providing an upward and downward sliding means to support the sheave movably in the width direction of the gantry by following the locus of the hoisting wire shifting in the width direction of a winch drum produced by the hoisting and lowering operation of the winch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing winding of a hoisting wire provided on a crane such as a crawler crane, and more particularly to a hoisting wire of one winch in a plurality of winches being erroneously mounted on another winch. The present invention relates to a hoisting wire winding prevention device for preventing winding.

[0002]

2. Description of the Related Art A relatively large crane, for example, a crawler crane for civil engineering work, has a structure in which a crane body has a plurality of winches such as four for main winding, auxiliary winding, third (optional), and boom. In this case, a crane body is provided with one boom at the front side, one gantry at the rear side, and a plurality of winches arranged in the longitudinal direction in the front and rear. There are many things. When a plurality of winches are lined up in the longitudinal direction of the crane body in this way, when the rear winch, for example, the third hoisting wire is in a loose state without tension, the boom posture is set. When an operation such as change is performed, there is a problem in that the winding wire in a loose state falls on the winch (supplementary winding) that is operating immediately before the wire and is erroneously wound. It often occurs.

In recent cranes, there are many types of cranes in which a main winch, an auxiliary winch, and a third winch are arranged in this order from the front side to the rear side of the crane body. Conventionally, an idler sheave is provided at the middle or top of the gantry to regulate the 3-wire winch wire route so that large route displacement does not occur. ing.

[0004]

An example of a general gantry structure in a conventional crane of this type is disclosed in Japanese Patent Application Laid-Open No. 9-5.
No. 8980, but in FIG.
Referring to FIG. 2, the right compression member 33 and the left compression member 33 opposite the upper end of the backstay 34 in the width direction of the fuselage are connected to each other by a pin 38 so as to extend over the upper end of the backstay 34. Even if it is attempted to provide the idler sheave with respect to the gantry peak pin axis, since two undulating wire sheaves for guiding the hoisting wire for raising and lowering the boom are already provided, a space for newly providing an idler sheave is provided. Therefore, it is impossible to restrict the route of the rear winding wire from the structural point of view.

In particular, when the third winch is so large that the drum width is equal to the drum width of the main winch and the auxiliary winch, the idler sheave slides in order to follow the locus of the wire moving in the width direction. The width is much larger than that of the conventional small third winch, which complicates the structure.

[0006] If the required idler sheave is provided on the gantry peak pin shaft assuming that it can be installed, the third winch hoisting wire is opposed to the resultant force acting directly on the idler sheave when the winding wire holds the tension. The gantry needs a high-strength peak pin shaft and a compression member that can be obtained, which causes a problem of increasing weight and cost. Furthermore, there is a problem that as the maximum hoisting force of the third winch increases, the weight and cost increase.

In contrast to the above-described arrangement provided at the top of the gantry, it is conceivable to provide a dedicated idler sheave and a gantry peak pin shaft on the winding wire of the third winch in the middle of the gantry. Even if there is a slight difference from the provision example, the problems of weight increase and cost increase still exist.

On the other hand, it is possible to provide a horizontal bar inside the gantry to prevent the winding of the hoisting wire from dropping, but it is possible to prevent the winding of the hoisting wire under tension from the front winch. It is necessary to arrange a horizontal bar at a position avoiding the trajectory in consideration of the trajectory in which the upper wire is displaced in the vertical direction of the crane body due to the change in the boom hoisting angle. In particular, when the working posture has a small boom angle, the hoisting wire of the rear winch interferes with the horizontal bar for preventing winding and is inevitably bent.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and accordingly, an object of the present invention is not to increase the weight of the gantry, complicate the structure, and increase the cost of the apparatus due to the increase. This ensures that the hoisting wire is not entangled in the rear winch, and prevents the hoisting wire from sagging in any position of the boom. It is intended to provide a crane to be improved.

[0010]

The present invention has the following configuration to achieve the above object. That is, the invention of claim 1 according to the present invention includes one boom 4 and one gantry 5 provided before and after the crane body 2.
And a crane 1 having a plurality of winches 6A to 6D arranged side by side in the longitudinal direction of the crane body 2, except for the boom winch 6D and the winch 6C immediately before the boom winch 6C. Hoisting wire entanglement prevention device 11 correspondingly attached to gantry 5
A sheave 15 pivotally supported by a horizontal shaft 17 attached to the gantry 5 and guided by a hoisting wire 9B of a winch 6B;
The sheave 15 and the horizontal bar 16 are moved in the vertical direction of the gantry 5 by following the trajectory of the horizontal bar 16 attached to the gantry 5 and following the trajectory of the hoisting wire 9B displaced in the vertical direction of the crane body 2 caused by a change in the boom undulation angle. And a vertical sliding means for movably supporting the movable member.

Further, the invention of claim 2 according to the present invention is characterized in that one of the booms 4 and 1 provided before and after the crane body 2 is provided.
In a crane 1 including a base gantry 5 and a plurality of winches 6A to 6D arranged side by side in the longitudinal direction of the crane body 2, at least one of the boom winches 6D and a winch 6C immediately before the boom winch 6D are arranged from the rear side. A hoisting wire winding-in prevention device 11 attached to the gantry 5 corresponding to the two winches 6B. The sheave is supported by the horizontal shaft 17 attached to the gantry 5 and guided by the hoisting wire 9B of the winch 6B. 15, a horizontal bar 16 attached to the gantry 5 at an upper position near the sheave 15, and a sheave following the trajectory of the hoisting wire 9B displaced in the vertical direction of the crane body 2 caused by a change in the boom up / down angle. Up / down sliding means for supporting the gantry 5 and the horizontal bar 16 so as to be movable in the up / down axial direction, and the winch 6B is formed by a hoisting / lowering operation of the winch 6B. To follow the trajectory of the winding wire 9B displaced in the width direction of the drum, characterized in that a structure comprising right and left sliding means for supporting movably the sheaves 15 in the width direction of the gantry 5.

According to a third aspect of the present invention, there is provided a crane hoisting wire winding-in prevention device according to the first or second aspect, wherein the vertical sliding means comprises a width of the crane body 2 in the gantry 5. A pair of guide rails 18 extending in parallel to the vertical axis direction along a pair of compression members 12 provided opposite to each other in the direction, and slidably engaged with each guide rail 18. The horizontal bar 1 comprises a pair of holders 19.
6 and the horizontal shaft 17 are provided laterally across the width of the gantry 5 between the pair of holders 19, and the horizontal bar 16 of the
It is characterized in that the connecting member for connecting the pair of holders 19 and the winding preventing member for preventing winding of the wire are also used.

According to a fourth aspect of the present invention, there is provided the crane hoisting wire winding-in prevention device according to the third aspect, wherein the vertical slide means is provided with one of the pair of holders and the boom or the boom. A link member (28) is provided between the back stop (27) connected to the boom (4) and linked to the back stop (27). The holder (19) is displaced by a predetermined amount in the vertical axis direction of the gantry (5) in conjunction with the up and down movement of the boom (4). It is characterized by being formed so as to be.

According to a fifth aspect of the present invention, there is provided the crane hoisting wire winding-in prevention device according to the third aspect, wherein the vertical sliding means is provided between one of the pair of holders and the gantry. A link member (30) is provided, which is linked to a lower spreader (29) pivotally supported at the upper end.
9 is formed so as to be displaced by a predetermined amount in the vertical axis direction of the gantry 5.

According to a sixth aspect of the present invention, there is provided the crane hoisting wire winding-in prevention device according to the third aspect, wherein the vertical slide means detects the undulation angle of the boom 4. A detector 32, a driving device 31 that is dynamically connected to the pair of holders 19, and a detection device that receives a detection signal from the boom angle detector 32 and drives the driving device 31
And a controller 33 that outputs an operation output to the pair of holders 19 and displaces the pair of holders 19 in the vertical axis direction of the gantry 5 by an amount corresponding to a change in the boom undulation angle.

According to a seventh aspect of the present invention, there is provided the crane hoisting wire winding-in prevention device according to the third aspect, wherein the left and right sliding means is configured such that the width of the gantry is between the pair of holders. A horizontal shaft 17 formed on a sliding shaft that is provided horizontally across the direction and rotatably and axially slidably supports the sheave 15, and is rotatable and movable in an axial direction interlocked with the sheave 15. Horizontal axis 1 via support arm 25
And a roller 24 for preventing the cable from being pulled out, which is held by the sheave 15 and supported by the sheave 15 and supported by the hoisting wire 9B of the winch 6B.

According to the present invention as described above, even if the trajectory of the hoisting wire 9B under tension of one winch 6B may be displaced due to a change in the elevation angle of the boom 4, the trajectory follows the displacement. Since the hoisting wire wind-in prevention device 11 can be moved in the vertical axis direction of the gantry 5 by the vertical sliding means, regardless of the allowable boom posture and the wire hoisting / lowering work, the winch 6 at the rear thereof is provided.
c can be prevented from dropping onto the drum of the winch 6B.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

FIG. 1 shows an elevational view of a mobile crane 1 according to a first embodiment of the present invention. The illustrated mobile crane 1 includes a crane body 2 composed of an upper swing body, a lower traveling body 3 having crawler tracks, one boom 4 provided at the front of the upper swing body 2, and one gantry provided at the rear. 5, the first winch 6A, the second winch 6B, and the front winch 6A, the second winch 6B
The third winch 6C and the boom winch 6D are composed of a plurality of, for example, four winches.

The boom 4 is a lattice boom mounted to be able to be raised and lowered in an extended state. A main hook 7 and a supplementary hook 8 are hung from the tip of the boom, and the main hook 7 is a first winch. The hoisting wire 9A unwound from the second winch 6B is lifted by winding (winding) the hoisting wire 9A, and the auxiliary hook 8 is hoisted by the hoisting wire 9B unwinding from the second winch 6B. The boom 4 is supported by a wire rope 10, and the wire rope 10 is connected to a boom winch 6.
The hoisting wire (not shown) unwound from D
The boom 4 is pulled / pulled out by being lowered, and the boom 4 is raised and lowered. A counterweight 14 is attached to the rear end of the upper swing body 2 so that the counterweight 14 can be balanced with the moment due to the suspension load. Further, the wire rope 10 is a gantry 5 formed by the compression member 12 and the back stay 13.
Supported by the upper swing body 2.

Incidentally, the third winch 6C is a winch for an attachment member used for the companion work, and in the case of the all casing method in civil engineering work,
There is an example in which when the first winch 6A and the second winch 6B are used for excavating work using a hammer club, the third winch 6C is used for suspending a full swing excavator. Although the winding wires 9A and 9B are tight, the winding wire 9C of the third winch 6C does not have any tension and is in a loose state.

FIG. 2 is a front view of the crane body 2 of the mobile crane 1 according to the first embodiment of the present invention. In FIG. 2, the locus of the hoisting wire 9B unwound from the second winch 6B and extended when the boom 4 is in the fully upright state 4U is shown as a wire upper limit locus 9BU, and the third winch 6C is also shown. The trajectory of the winding wire 9C unwound from and extending from the upper limit trajectory 9CU
Further, the locus of the hoisting wire 9B unwound from the second winch 6B and extended when the boom 4 is in the state 4D in which the boom 4 is fully laid down is shown as the wire lower limit locus 9BD. The locus of the winding wire 9C unrolled from the winch 6C and extending is shown as a wire lower limit locus 9CD. Assuming that the winding wire 9C is loose without tension in this state, the winding wire 9C hangs down on the drum of the second winch 6B and is pulled in with the winding (winding) of the winding wire 9B. Situations may occur. In order to prevent such wire entanglement, the compression member 12 of the gantry 5 includes:
A hoist wire winding prevention device 11 is provided.

FIG. 3 is an enlarged view of the hoisting wire entanglement preventing device 11 in FIG. 2, FIG. 4 is a right side view of the hoisting wire entanglement preventing device 11 corresponding to FIG. 3, and FIG. It is a structural diagram which expands and shows the surrounding part A.

Referring to FIGS. 2 to 5, the hoisting wire entanglement prevention device 11 is provided in association with the pair of compression members 12 of the gantry 5 corresponding to the second winch 6B. A middle recessed ring-shaped sheave 15 which is generally called an idler sheave for guiding the winding wire 9B of the two winches 6B, and the third winch 6C
The horizontal wire 16 for preventing the hoisting wire 9C from being wound around the drum of the second winch 6B, up-down slide means, and left-right slide means.

The vertical sliding means is formed by a pair of guide rails 18 and a pair of holders 19 slidably engaged with the respective guide rails 18. The pair of guide rails 18 are made of, for example, grooved steel, and the pair of compression members 12, which are opposed to each other in the width direction of the crane body 2 and are set up obliquely rearward and upward.
On the other hand, the compression member 12 is provided so as to extend in parallel with the vertical (longitudinal) direction of the compression member 12 with the bottom of the grooved steel attached to the inside thereof. On the other hand, the pair of holders 19 are made of, for example, a saddle-shaped steel material having a length less than half the length of the guide rail 18 and are fitted to the guide rail 18 with a slight gap in the left and right width directions. Mounted. On the holder 19, a roller 20 is rotatably supported via a bracket 21 at a longitudinal central portion near both ends thereof, and is provided so as to be able to roll in contact with the inner bottom surface of the guide rail 18. Buffer pads 22 are attached to the inner surfaces of both side walls, and guide rails 18 are provided.
Are provided so as to be interposed in the gap with the both side walls.

The horizontal rod 1
The horizontal bar 6 and the horizontal shaft 17 are horizontally arranged between the pair of holders 19 in the width direction of the gantry 5 so as to be kept parallel to each other, and at least the horizontal bar 1 of the horizontal bar 16 and the horizontal shaft 17 is provided.
6 functions as a connecting member for holding and connecting the pair of holders 19 in parallel.

The vertical sliding means constructed as described above functions so that the horizontal bar body 16 presses the pair of holders 19 against the pair of guide rails 18, respectively, and the roller 20 is provided on the inner bottom surface of the guide rail 18. It functions to support the holder 19 while rolling in contact with it, and furthermore, since the buffer pad 22 functions to suppress the right-and-left swing of the holder 19, the pair of holders 19 are connected to each of the guide rails 1.
A pair of compression members 1 guided by 8
2 and can be slid smoothly in parallel with the vertical axis direction. 3 and 4, reference numeral 23 denotes a stopper fixed to both ends of the guide rail 18, which prevents the holder 19 from falling off the lower end of the guide rail 18 or jumping up from the upper end. It has become.

On the other hand, the left and right sliding means are provided with a horizontal hollow 17 formed on a sliding shaft and a middle hollow ring-shaped out-of-line prevention roller provided in a row in a position close to the sheave 15. 24. The horizontal axis 17 is
The gantry 5 is laterally bridged in the width direction of the gantry 5 between the pair of holders 19, and both ends are fixed, and the shaft body has the sheave 15 and the sheave 15 sandwiched between both sides. A pair of support arms 25 are slidably fitted.
The sheave 15 is slidably and rotatably supported on the horizontal shaft 17. And a pair of support arms 2
The roller 24 is rotatably supported at a free end of the roller 5 at a position close to the sheave 15 and in a row. In FIGS. 3 and 4, reference numeral 26 denotes a guard provided between the horizontal axis 17 and the horizontal bar 16 so as to be surrounded by the horizontal axis 17 by about 1/4 of the circumference.
The third winch 6C serves as a cover so that the winding wire 9C does not contact the sheave 15.

As shown in FIGS. 3 to 5, the left and right sliding means constructed as described above is provided with a second winch 6B.
The winding wire 9B extending from the drum to the tip of the boom 4 is held while being held between the sheave 15 and the roller 24, and is provided with a second winch 6B.
When the hoisting / unwinding operation is performed, the sheave 15 slides freely on the shaft of the horizontal shaft 17 in response to the hoisting wire 9B traversing in the drum width direction. The roller 24 moves in parallel with the axis of the horizontal axis 17 in conjunction with the sheave 15. Therefore, the sheave 15 and the roller 24 in the left and right sliding means play a role of driving a holder for sliding the up and down sliding means up and down following the displacement of the hoisting wire 9B in the up and down axial direction. It is.

Next, an outline of the operation of the hoisting wire entanglement preventing device 11 according to this embodiment will be described. As described above, the trajectory of the hoisting wire 9B of the second winch 6B is displaced within the movement range between the upper wire trajectory 9BU and the lower wire trajectory 9BD with the change in the undulation angle of the boom 4. The locus of the hoisting wire 9C of the three winches 6C is displaced within the movement range between the upper wire locus 9CU and the lower wire locus 9CD (see FIGS. 2 and 3). For example, if the boom 4 is in the lying state close to the state 4D in which the boom 4 is fully folded, the lower limit trajectories 9BD and 9CD are close to each other, and the gantry 5
In this state, the hoisting wire 9B is working and is tensed while the hoisting wire 9C is relaxed without working. There is a possibility that the upper wire 9C may hang down on the drum of the second winch 6B and be pulled in with the winding of the hoisting wire 9B.

At this time, the winding wire entanglement prevention device 11
In the above, since the sheave 15 and the roller 24 sandwich the hoisting wire 9B, the wire 9B moves in accordance with a change in the trajectory of the wire 9B in the vertical and width directions.
In the fall-down state, the hoisting wire entanglement prevention device 11 slides down to the position 11D in FIG. 3 and the horizontal bar 16 at the upper position immediately adjacent to the sheave 15 also slides down. Therefore, the horizontal wire 16 prevents the hoisting wire 9C from hanging down. Thus, the horizontal bar 16
Clearly function as both a connecting member and a sag preventing member.

On the other hand, even in the state 4U in which the boom 4 is upright, the hoisting wire entanglement preventing device 11 slides up to the position 11U in FIG. Since the slide is moving up,
Even if the hoisting wire 9C loses its tension and hangs down, the horizontal wire 16 allows the hoisting wire 9C to move the second winch 6.
No more drooping on B's drum. As described above, the vertical sliding range of the hoisting wire entanglement prevention device 11 is limited to the limited area S between the upright state 11U and the laid-down state 11D in FIG. 3, which is determined at the time of design. You.

The above embodiment is an example in which the hoisting wire entanglement preventing device 11 is provided corresponding to the second winch 6B, but the hoisting wire entanglement device is similarly provided for the first winch 6A. A prevention device 11 may be provided.
For example, when the trajectory of the hoisting wire 9A of the first winch 6A intersects with the compression member 12 of the gantry 5, another hoisting wire entanglement prevention device is added, and the second winch 6B In this case, the winding wire 9B of the second winch 6B can be prevented from being wound around the drum of the first winch 6A. .

FIG. 6 is an elevational view of the mobile crane according to the second and third embodiments of the present invention, and FIG. 7 is a diagram showing a portion of the hoisting wire winding prevention device 11 in FIG. Are shown, respectively. In the second and third embodiments, similar to the first embodiment, corresponding members have the same reference characters allotted, and description thereof will not be repeated. explain.

The feature of the configuration of the hoisting-wire entanglement prevention device 11 according to the second embodiment is as follows.
The movement of a lower spreader 29 provided in connection with the boom 4 is used as holder driving means for sliding the holder 19 of the vertical sliding means up and down following the vertical displacement of the hoisting wire 9B. That is. That is, since the lower spreader 29 pivotally connected to the upper end of the gantry 5 and connecting the wire rope 10 has a structure in which the ground angle changes in the same manner as the boom 4 changes in elevation, This lower spreader 29
Is used as a drive source.

In this case, for example, when the upper end of the lower spreader 29 and the upper end of the holder 19 are connected by a connecting member 30 such as a wire, the boom 4 is moved upright and the ground angle of the lower spreader 29 increases. The movement is transmitted to the holder 19 via the connecting member 30 as an upward movement. Conversely, when the boom 4 is moved to the falling side and the ground angle of the lower spreader 29 decreases, the movement is transmitted to the holder 19. On the other hand, it is transmitted as a downward movement, and thus the holder 19 can be automatically slid up and down.

According to the hoisting wire entanglement preventing device 11 according to the second embodiment, the sheave 15 in the hoisting wire entanglement preventing device 11 according to the first embodiment described above and its related parts are provided. (For example, the horizontal shaft 17 and the rope preventing roller 24) can be omitted, and the structure of the vertical sliding means can be simplified.

On the other hand, the feature of the configuration of the hoisting wire entanglement prevention device 11 according to the third embodiment is that the backstop 27 provided in association with the boom 4 is also provided as a holder driving means. That is to use movement. That is, the backstop 27, which is linked and connected between the lower rear part of the boom 4 and the upper part of the crane body 2, has a structure in which the ground angle changes in the same manner as the boom 4 changes in elevation. For this reason, the movement of the backstop 27 is used as a drive source.

Accordingly, the connecting member 28 made of a metal bar is extended between the backstop 27 and the holder 19, and one end is located near the lower end of the backstop 27 and the other end is located at the upper end of the holder 19. The parts are linked to each other to be used as a displacement transmitting member. According to the hoisting wire entanglement preventing device 11 according to the third embodiment, the same operation as that of the second embodiment is performed. Hoisting wire entanglement prevention device 11 according to the first embodiment
Sheave 15 and its related members (for example, the horizontal axis 1)
7, the roller 24) can be omitted, and the structure of the vertical slide means can be simplified. In addition, instead of connecting the connecting member 28 to the backstop 27, the connecting member 28 may be directly connected to the back of the boom 4 near the lower end.

FIG. 8 shows a main structure of a mobile crane according to a fourth embodiment of the present invention, wherein (a) is a front view of a crane body part, and (b) is a winding wire winding. FIG. 5C is a drive control block circuit diagram of the hoisting wire entanglement preventing device 11.

The fourth embodiment is similar to the first embodiment. Corresponding members have the same reference characters allotted, and description thereof will not be repeated. explain.

The feature of the structure of the hoisting wire entanglement prevention device 11 according to the fourth embodiment is that
The automatic slide control of the vertical slide means is performed by an electric-power conversion mechanism.
And an electric-power conversion mechanism including a boom angle detector 32 and a controller 33 in association with the vertical slide means.

The boom angle detector 32 is mounted at an appropriate position near the lower end of the boom 4 so that the boom 4 can detect the ground angle of the boom 4 and output it as an electric signal. The drive device 31 is composed of a drive source, for example, a geared motor mounted on the holder 19, and a chain is bridged between a sprocket fitted on the output shaft of the motor and a sprocket fitted on the shaft of the roller 20, The rotation of the geared motor is transmitted to the roller 20 as a rotational motion. On the other hand, the controller 33 is provided, for example, in a control panel in the cab and has a boom angle detector 32.
When the detection signal from the controller is introduced, an operation output corresponding to the detection signal is output to drive the geared motor.

Such an electric-power conversion mechanism automatically slides the holder 19 to displace the holder 19 in the vertical axis direction of the gantry 5 by a considerable amount corresponding to the change in the boom undulation angle. The rod 16 is wound on the wire 9
It is possible to move following the locus of B. Although not shown, a rack is installed in parallel on the guide rail 18 side, and a pinion is fitted on the shaft of the roller 20 to form a rack and pinion mechanism, so that the slide control of the holder 19 can be more reliably performed. Is possible. Also in this example, the sheave 15 in the hoisting wire entanglement prevention device 11 in the above-described first embodiment and members related thereto (for example, the horizontal shaft 17 and the outrigging prevention roller 24) can be omitted. The structure of the vertical sliding means can be simplified.

The above embodiments have been described based on an example of a mobile crane such as a crawler crane.
It goes without saying that the invention is not limited to mobile cranes but also applies to fixed cranes.

[0046]

The present invention is embodied in the form described above and has the following effects. That is,
ADVANTAGE OF THE INVENTION According to this invention, since the hoist wire winding prevention apparatus was comprised so that it could be moved at least up and down, up and down, and right and left according to the change of the locus | trajectory (position) of the hoist wire of one winch, the permissible boom attitude | position is possible. Regardless of the wire hoisting / lowering operation, it is possible to reliably prevent the hoisting wire of the winch at the rear from hanging down on the immediately preceding winch drum.

Further, the present invention eliminates the need for reinforcing the gantry by increasing the number of winches by providing the above-mentioned hoisting wire entanglement prevention device, which increases the weight, complicates the structure, and the device cost due to the reinforcement. This has the effect of eliminating the problem of ascent and reducing the overall cost of the crane.

[Brief description of the drawings]

FIG. 1 is an elevation view of a mobile crane according to a first embodiment of the present invention.

FIG. 2 is a front view of a crane body of the mobile crane according to the first embodiment of the present invention.

FIG. 3 is an enlarged view of the hoisting wire entanglement prevention device 11 in FIG. 2;

FIG. 4 is a hoisting wire entanglement prevention device 11 corresponding to FIG.
FIG.

FIG. 5 is an enlarged structural view of a circle A in FIG. 4;

FIG. 6 is an elevational view of a mobile crane according to second and third embodiments of the present invention.

FIG. 7 is an enlarged view of a hoisting wire entanglement prevention device 11 in FIG. 6;

8A and 8B show a main structure of a mobile crane according to a fourth embodiment of the present invention, wherein FIG. 8A is a front view of a crane body part, and FIG. FIG. 3C is a drive control block circuit diagram of the hoisting wire entanglement prevention device 11.

[Explanation of symbols]

1. Crane 2. Crane body 3
… Undercarriage 4… Boom 5… Gantry 6A-D
... winch 7 ... main hook 8 ... supplementary hook 6A-C
... Hoisting wire 10 ... Wire rope 11 ... Hoisting wire entanglement prevention device 12 ... Compression member 1
3 Backstay 14 Counterweight 15 Sheave 1
6 ... Horizontal bar 17 ... Horizontal axis 18 ... Guide rail 1
9: Holder 20: Roller 21: Bracket 2
2 ... Buffer pad 23 ... Stopper 24 ... Roll-out prevention roller 2
5. Support arm 26 ... Guard 27 ... Backstop 2
8 ... connecting material 29 ... lower spreader 30 ... connecting material 3
DESCRIPTION OF SYMBOLS 1 ... Drive device 32 ... Boom angle detector 33 ... Controller
S ... area

Claims (7)

[Claims] 1. A crane having one boom and one gantry provided in front of and behind a crane body, and a plurality of winches arranged side by side in the longitudinal direction of the crane body. A hoisting wire wrap prevention device attached to the gantry corresponding to at least one winch from the rear side except for a winch, the hoisting of the winch being supported by a horizontal shaft attached to the gantry. A sheave guided by a wire, a horizontal bar attached to the gantry at an upper position near the sheave, and following a trajectory of the hoisting wire displaced in a vertical direction of the crane body caused by a change in a boom undulation angle. And a vertical slide means for supporting the sheave and the horizontal bar movably in the vertical axis direction of the gantry. Device to prevent winding of wire. 2. A crane having one boom and one gantry provided in front of and behind a crane body, and a plurality of winches arranged side by side in the longitudinal direction of the crane body. A hoisting wire wrap prevention device attached to the gantry corresponding to at least one winch from the rear side except for a winch, the hoisting of the winch being supported by a horizontal shaft attached to the gantry. A sheave guided by a wire, a horizontal bar attached to the gantry at an upper position near the sheave, and following a trajectory of the hoisting wire displaced in a vertical direction of the crane body caused by a change in a boom undulation angle. A vertical sliding means for supporting the sheave and the horizontal bar so as to be movable in a vertical axis direction of the gantry; and a hoisting / lowering operation of the winch. Left and right slide means for pivotally supporting the sheave so as to be movable in the width direction of the gantry, following a trajectory of the hoisting wire generated by the operation and displaced in the width direction of the winch drum. Anti-winding device for winding wire. 3. A pair of guide rails extending vertically in parallel with the pair of compression members provided opposite to each other in the width direction of the crane body in the gantry. It consists of a pair of holders respectively slidably engaged with the respective guide rails, and the horizontal bar and the horizontal axis are horizontally arranged between the pair of holders across the width direction of the gantry, and The crane hoist wire winding prevention according to claim 1 or 2, wherein the horizontal bar body also serves as a connection member for connecting the pair of holders and a winding prevention member for preventing wire winding. apparatus. 4. An up-and-down sliding means comprising a connecting member which is linked and connected between one of the pair of holders and a boom or a back stop connected to the boom,
4. The apparatus according to claim 3, wherein the holder is displaced by a predetermined amount in the vertical axis direction of the gantry in conjunction with the up and down movement of the boom. 5. An up-and-down sliding means comprising a connecting member which is linked and connected between one of the pair of holders and a lower spreader pivotally supported at an upper end of the gantry, and is provided for raising and lowering movement of the boom. 4. The apparatus according to claim 3, wherein the holder is displaced by a predetermined amount in the vertical axis direction of the gantry. 6. A boom angle detector for detecting up and down angles of a boom, a driving device dynamically connected to a pair of holders, and a detection signal is introduced from the boom angle detector. 4. The apparatus according to claim 3, further comprising: a controller that outputs an operation output to the driving device and displaces the pair of holders in the vertical axis direction of the gantry by an amount corresponding to a change in the boom undulation angle. . 7. A sliding shaft is provided between a pair of holders and is laterally provided across a width of the gantry, and is formed on a sliding shaft which supports the sheave so as to be rotatable and slidable in the axial direction. A horizontal axis, and a roller for preventing a rope from being pulled out and supported by the horizontal axis via a support arm so as to be rotatable and movable in the axial direction interlocked with the sheave and holding the winch winding wire with the sheave. The hoist wire entanglement prevention device for a crane according to claim 3.