JPH10338475A - Tension applying device of wire rope for winch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly wind a part on the way of a wire rope on a joint drum in the aligned state regardless of the magnitude of tension to be applied to the wire rope. SOLUTION: A part on the way of a wire rope 3 to be supplied from a rope supplying machine 4 to a winch 1 is wound on a body part of a load winding drum 22 in plural turns. Inclined flange parts 22B, 22C whose diameters are increased at the different angles are formed on both right and left sides in the axial direction of the body part. The wire rope 3 from the rope supplying machine 4 is selectively guided to the inclined flange part side of the inclined flange parts 22B, 22C. The wire rope 3 from the load winding drum 22 is guided from the other inclined flange part side toward the drum 2 by a second rope guide 32. Rotational load is applied to a barrel winding drum 6 and the load winding drum 22 by hydraulic motors 10, 22 provided with relief valves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for applying tension to a winch wire rope which is preferably used when a new wire rope is wound around a drum of a rope winch mounted on a construction machine such as a hydraulic crane. .

[0002]

2. Description of the Related Art In general, a rope winch is mounted on a construction machine such as a hydraulic crane, and a wire rope is wound around a drum of the rope winch under a sufficient tension. By operating the winch, the drum is rotated in the forward and reverse directions when performing a load operation or the like, and the wire rope is wound or unwound on the drum.

When a new wire rope or the like is wound around the drum, it is required that the wire rope be wound around the drum with sufficient tension applied to the wire rope.

That is, when the wire rope is wound in multiple layers on the drum without applying sufficient tension to the wire rope, the wire rope is added to the wire rope when the boom is raised or lowered or when a load is suspended. Due to a load such as a tensile load, phenomena such as "the upper wire rope bites into the lower layer" or "the wire rope that bites into the lower layer is released to the upper layer" among the multilayered wire ropes occur, and the suspended load is instantaneous. Troubles such as falling to the ground and causing load swing.

Therefore, in Japanese Patent Application Laid-Open No. 8-40693 and the like, a wooden drum around which a new wire rope is wound is installed at a distance from the rope winch, and a wooden drum is placed between the wooden drum and the rope winch drum. A relay drum as a control drum is provided, and an intermediate portion of a wire rope guided from a wooden drum is placed around the relay drum by 3 to 4 parts.
A wire rope feeding device configured to supply the wire rope to the rope winch side in a wound state is described.

In this prior art, for example, when a wire rope is supplied to the rope winch side via a relay drum, a load is applied to the rotation of the relay drum by using a means such as a hand brake. With sufficient tension applied to the wire rope, the wire rope is wound around a drum on the rope winch side. In addition, by winding the middle part of the wire rope around the relay drum a plurality of times, the contact area between the wire rope and the relay drum is increased, the frictional resistance between the two is increased, and the middle part of the wire rope is formed. Sliding along the outer circumference of the relay drum is prevented.

In this prior art, the outer peripheral side of the relay drum is formed as a drum-shaped tapered portion whose diameter is gradually reduced from both ends in the axial direction toward the center. When the wire rope is wound from the wooden drum to the relay drum, the wire rope is "slided" along the tapered portion from both axial sides of the relay drum to the center, thereby tapering the wire rope. The wire rope is always guided to the center side (the smallest diameter portion side), thereby preventing the wire rope from becoming turbulent around the relay drum.

[0008]

In the above-mentioned prior art, the intermediate portion of the wire rope guided from the wooden drum to the rope winch is wound around a relay drum, and a rotational load is applied to the relay drum to thereby reduce the wire load. While increasing the frictional resistance between the rope and the relay drum, and applying a tension in the direction opposite to the winding direction to this wire rope,
The structure is such that this wire rope is firmly wound around the rope winch. The outer diameter of the wire rope is set to various sizes, depending on the type of the crane and the like.

Therefore, when a wire rope having a relatively large outer diameter is wound around the rope winch, the contact area between the wire rope and the relay drum increases, and the frictional resistance between the two increases. Accordingly, the tension applied to the wire rope tends to increase.

In this case, however, while the tension of the wire rope is increased, a large frictional force acts between the wire rope and the tapered portion of the relay drum as a sliding resistance.
Due to this sliding resistance, the wire rope does not "slip" along the tapered portion of the relay drum, but stays at an intermediate portion of the tapered portion, and the tip side of the wire rope is sent out to the rope winch side in this state. is there. Then, if the relay drum continues to rotate while the wire rope stays in the middle part of the tapered portion, the next wire rope is placed on the stayed wire rope every time the relay drum makes one rotation. It overlaps and is wound.

As a result, the wire rope becomes turbulent around the relay drum, and the overlapped wire ropes become entangled with each other, causing not only breakage and damage of the wire rope, but also from the relay drum to the rope winch side. There is a problem in that the tension of the wire rope sent out varies, and it becomes difficult to wind the wire rope around the drum of the rope winch in a state where a stable tension is applied to the wire rope.

On the other hand, when a wire rope having a relatively small outer diameter is wound around a rope winch, the contact area between the wire rope and the relay drum is reduced, so that the frictional resistance between the two is reduced. Accordingly, the tension applied to the wire rope tends to be weakened, and the above-described problem is less likely to occur.

However, in this case, the moving speed (sliding speed) when the wire rope "slides" along the tapered portion may be excessively high. There is a problem in that the wire rope vibrates so as to undulate with the winch, and it becomes difficult to stably wind the wire rope around the rope winch.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention has a structure in which a wire rope from a rope source is wound around a winch drum even when the outer diameter of the wire rope is large. Even in this case, the wire rope can be continuously wound in a state of being aligned with the relay drum in a state of being aligned, thereby preventing occurrence of irregular winding and the like, and applying a stable and sufficient tension to the wire rope. It is an object of the present invention to provide a tensioning device for a winch wire rope that enables the rope to be strongly wound around a winch drum.

[0015]

In order to solve the above-mentioned problems, the present invention provides a winch drum for winding and unwinding a wire rope, and a wire rope for supplying the wire rope to the drum. A rope supply source installed at a position distant from the drum, a relay drum disposed between the rope supply source and the drum, and an intermediate portion of a wire rope to be supplied to the drum is wound; The present invention is applied to a winch wire rope tension applying device comprising load generating means for generating a load in rotation of the relay drum and applying tension to the wire rope supplied to the drum.

A feature of the structure adopted in the first aspect of the present invention is that the relay drum is located at an intermediate portion in the axial direction and the wire rope is wound around the outer periphery, , And first and second inclined flange portions which are located on both right sides and have a tapered shape with different inclination angles.

According to the above configuration, when the wire rope is wound around the winch drum, a load is applied to the rotation of the relay drum by the load generating means to increase the frictional resistance between the relay drum and the wire rope. The wire rope can be firmly wound around the drum while applying a tension in a direction opposite to the winding direction to the rope.

One of the first and second inclined flange portions of the relay drum is selected according to the outer diameter of the wire rope, and the wire rope from the rope supply source is selected. By guiding the wire rope toward the inclined flange portion, the wire rope can be kept `` sidewardly displaced '' along the inclined flange portion against the sliding resistance acting between the wire rope and the inclined flange portion, The wire rope can be smoothly guided from the inclined flange portion to the trunk portion.

According to the second aspect of the present invention, the wire rope is provided between the rope supply source and the relay drum so as to be movable in the axial direction of the relay drum, and the wire rope pulled out from the rope supply source is connected to the rope supply source. A first rope guide that selectively guides one of the first and second inclined flange portions of the relay drum toward one of the inclined flange portions; and a first rope guide that is located between the relay drum and the drum. A second rope guide is provided movably in the axial direction, and guides the wire rope toward the drum from the other inclined flange portion side opposite to the first rope guide.

By moving the first rope guide in the axial direction of the relay drum and adjusting the position, the wire rope is connected to one of the first and second inclined flange portions of the relay drum. Can be reliably guided toward the part. Similarly, by moving the second rope guide in the axial direction of the relay drum to adjust the position, the wire rope wound around the relay drum can be reliably guided to the drum.

Further, in the invention of claim 3, the trunk portion of the relay drum has a cylindrical shape, and is configured to extend in the axial direction with a length dimension larger than at least the outer diameter of the wire rope.

Thus, the wire rope can be wound in a state in which the middle part thereof is securely brought into contact with the outer peripheral side of the cylindrical body.

Still further, according to the invention of claim 4, the load generating means is provided in the middle of a pair of main pipelines connecting the hydraulic motor to a hydraulic power source connected to a rotary shaft of the relay drum and a hydraulic source. And a relief valve positioned between the switching valve and the hydraulic motor and provided between the pair of main pipelines.

When the wire rope is wound around the drum via the relay drum, the switching valve is switched to disconnect the hydraulic motor from the hydraulic power source in advance, and the drum is driven to rotate in this state. . Since the pulling force is transmitted to the relay drum side by pulling the wire rope with the drum, the relay drum integrated with the hydraulic motor is forcibly rotated by the pulling force, and is rotated by the rotation of the hydraulic motor. As a result, a brake pressure is generated in the main line of the hydraulic motor, and the brake pressure rises to the set pressure of the relief valve, so that a large rotational load can be applied to the relay drum.

[0025]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 8 show a winch wire rope tension applying device according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a rope winch mounted on a hydraulic crane or the like. The winch 1 rotates a drum 2 in a forward or reverse direction by a hydraulic motor (not shown) or the like, thereby forming a wire rope on the outer peripheral side of the drum 2. 3 is wound or unwound.

Here, the outer diameter of the wire rope 3 is set to various sizes depending on the type of the hydraulic crane and the like. For example, as shown in a wire rope 3 'shown in FIGS. In some cases, the outer diameter is set smaller than 3.

Reference numeral 4 denotes a rope feeder as a rope supply source for supplying a new wire rope 3 or the like to the drum 2 of the winch 1. The rope feeder 4 is placed on the base 5 at a position which is spaced from the winch 1 in advance. It comprises a wooden barrel winding drum 6 and supports 7, 8, etc., which are arranged to rotatably support the barrel drum 6 between the rotating shafts 7A, 8A. A new wire rope 3 is wound around the outer periphery of the barrel winding drum 6 in a multi-layer winding state, and the tip end of the wire rope 3 is pulled out to the winch 1 side by an operator or the like.

The support table 7 among the support tables 7 and 8 is configured as a movable table provided on the base 5 so as to be movable via the rails 9, and the support table 8 is provided with bolts (see FIG. (Not shown) or the like.

Reference numeral 10 denotes a hydraulic motor provided on the rope feeder 4 side. The hydraulic motor 10 is provided with a speed reducer 11 and the like, and its output shaft (not shown) has a rotating shaft 8A of the support base 8.
Connected to the side. Then, as shown in FIG. 6, the hydraulic motor 10 is driven to rotate by supply of pressurized oil from a hydraulic pump 12, which will be described later, to transmit a rotational force to the barrel winding drum 6 via a rotary shaft 8A and the like. 12 is a tank 13
And a hydraulic pump that constitutes a hydraulic power source.
The hydraulic oil in the main line is a high-pressure oil, and the main lines 14A, 1
It discharges to the 4B side.

Reference numerals 14A and 14B denote a pair of main conduits connecting the hydraulic motor 10 to the hydraulic pump 12 and the tank 13, and 15 denotes a directional control valve disposed in the middle of the main conduits 14A and 14B. 15 is switched from the neutral position (a) to the switching positions (b) and (c) by the operator manually operating the operation lever 15A, and the hydraulic pump 12 is switched from the hydraulic pump 12 to the hydraulic motor 10 at the switching positions (b) and (c). The direction of the pressure oil supplied to and discharged from the motor is switched.

Reference numerals 16A and 16B denote a pair of relief valves provided in the middle of the main pipelines 14A and 14B, respectively. The relief valves 16A and 16B have a fixed relief pressure and a constant pressure value (for example, about 40 kg / cm ^2). ) Is predetermined.

Here, the direction switching valve 15 is moved to the neutral position (a).
When the barrel winding drum 6 is forcibly rotated by an external force together with the hydraulic motor 10 in a state where the hydraulic motor 10 is switched, a large brake pressure is generated in one of the main pipelines 14A and 14B by the rotation of the hydraulic motor 10, and the brake pressure causes a relief. The valve 16A or 16B is forcibly opened and the main line 14A, 1
The pressure oil flows between 4B. As a result, a hydraulic brake corresponding to the relief set pressure is applied to the hydraulic motor 10, and a rotational load (braking force) corresponding to the hydraulic brake is applied to the barrel drum 6.

Reference numeral 17 denotes a tension applying mechanism provided between the drum 2 and the rope feeder 4.
Is configured by a speed reducer 21, a load winding drum 22, a hydraulic motor 23, and the like, which will be described later, and applies tension to the wire rope 3 supplied from the rope supply device 4 toward the winch 1. The tension applying mechanism 17 is installed on a pedestal plate 18 fixed to the base 5, and the pedestal plate 18 is located on a first rope guide 27 side, which will be described later, and has screw holes 18A, 18A shown in FIG. , And screw holes 18B, 18B,... Shown in FIG. 7 are alternately formed along the axial direction of the load winding drum 22. The pedestal plate 18 is located on the side of a second rope guide 32, which will be described later, and has screw holes 18C, 18C,... Shown in FIG.
Are alternately formed along the axial direction of the load winding drum 22.

Reference numerals 19 and 20 denote load-wound drums 2 on the base 5.
2 is rotatably supported by the support bases 19, 2
As shown in FIGS. 1 to 4, the support base 19 is provided with a leg 19A fixed on the base plate 18 of the base 5 via bolts (not shown) or the like, and provided on the leg 19A. And a bearing 19C provided on the support plate 19B and rotatably supporting a rotating shaft 22D described later. Further, the support base 20 also has legs 20A, a support plate 20B, and the like, and a speed reducer 21 is provided on the support plate 20B.

Reference numeral 22 denotes a center position of the base 5 and supports 19,
20 is a load-wound drum as a relay drum rotatably provided between the load motor 20 and the load-wound drum 22.
The rotation load is applied by the relief valves 26A and 26B and the like described later, and the tension is generated on the wire rope 3.

As shown in FIGS. 1 to 5, the load winding drum 22 has a body 22A which extends in a cylindrical shape in the axial direction with at least a length dimension larger than the outer diameter of the wire rope 3. First and second inclined flange portions 22B, 2 which are located on both left and right sides of the body portion 22A and gradually expand and extend in a tapered shape with different inclination angles α, β.
2C, and the wire rope 3 is wound in a single layer around the outer periphery of the body 22A. The load winding drum 22 has a rotating shaft 22D. One end of the rotating shaft 22D is connected to the speed reducer 21, and the other end is rotatably supported by a bearing 19C of the support base 19.

Here, the inclination angle α of the inclined flange portion 22B is set to be larger than the inclination angle β (α> β) of the inclined flange portion 22C. That is, the inclined flange portion 2
Of the 2B and 22C, the outer peripheral surface of the inclined flange portion 22B is formed as a steeply inclined surface, and the outer peripheral surface of the inclined flange portion 22C is formed as a gentle inclined surface with a relatively gentle inclination.

Then, as shown by a dashed line in FIGS. 2 and 5, the wire rope 3 is connected to the inclined flange portions 22B, 22B.
When the wire rope 3 is guided toward the inclined flange portion 22B side of the wire C, the wire rope 3 "winds off" in the direction of arrow A along the inclined flange portion 22B while being wound around the load winding drum 22, Thereby, the wire rope 3 is guided from the inclined flange portion 22B side to the 22C side along the outer peripheral surface of the trunk portion 22A.

On the other hand, when the wire rope 3 ′ is guided toward the inclined flange portion 22 C side as shown by a dashed line in FIGS. 7 and 8, the wire rope 3 ′ is inclined while being wound around the load winding drum 22. The wire rope 3 'comes to "slip laterally" in the direction of arrow B along the flange portion 22C, whereby the wire rope 3' is guided from the inclined flange portion 22C side to the 22B side along the outer peripheral surface of the body 22A.

Reference numeral 23 denotes a hydraulic motor provided on the support base 20 via a speed reducer 21. The hydraulic motor 23 has an output shaft (not shown) having a rotating shaft 22 of the load winding drum 22.
D is connected via a speed reducer 21. The hydraulic motor 23 transmits rotational force to the load winding drum 22 via the speed reducer 21 and the like by being rotationally driven by the supply of pressure oil from the hydraulic pump 12.

Reference numerals 24A and 24B denote a pair of main pipelines connecting the hydraulic motor 23 to the hydraulic pump 12 and the tank 13,
Reference numeral 25 denotes a directional control valve disposed in the middle of the main pipelines 24A and 24B. The directional control valve 25 is operated in the neutral position (d) by the operator manually operating the operation lever 25A similarly to the directional control valve 15. ) To switching position (e),
(F), and the direction of the pressure oil supplied and discharged from the hydraulic pump 12 to the hydraulic motor 23 is switched at the switching positions (e) and (f).

Reference numerals 26A and 26B denote a pair of relief valves provided in the middle of the main pipelines 24A and 24B, respectively. The relief valves 26A and 26B have a relief set pressure of, for example, about 50 to 200 kg / cm ^2. Is set. The relief valves 26A and 26B, together with the hydraulic motor 23 and the direction switching valve 25,
And a load generating means for applying a load to the second rotation.

Then, the directional control valve 25 is moved to the neutral position (d).
And the load winding drum 22 is connected to the hydraulic motor 23
Together with the external motor, the hydraulic motor 2
3, a large brake pressure is generated in one of the main lines 24A and 24B, and the brake pressure forcibly opens the relief valve 26A or 26B.
Pressure oil flows between A and 24B. As a result, a hydraulic brake corresponding to the relief set pressure is applied to the hydraulic motor 23, and a rotational load (braking force) corresponding to the hydraulic brake is applied to the load winding drum 22.

Reference numeral 27 denotes a first rope guide which is provided between the barrel winding drum 6 and the load winding drum 22 so as to be movable in the axial direction of the load winding drum 22. As shown in FIGS. 2 and 3, a support base 28 having a substantially rectangular mounting plate 28A integrally formed on the lower end side, and a base end side turned around the upper end side of the support base 28 via a bearing (not shown) or the like. Movably provided, and the tip side is a bracket portion 2
9A, 29A, a mounting bracket 29 bifurcated in the axial direction of the load winding drum 22, and a pair of guide rollers 30, 30 rotatably provided between the bracket portions 29A of the mounting bracket 29. It is composed of

Then, as shown in FIG. 2, each bolt 31 is screwed into each screw hole 18B shown in FIGS.
When the mounting plate 28A is fixed on the pedestal plate 18, each guide roller 30 is arranged at a position facing the inclined flange portion 22B of the load winding drum 22. When each bolt 31 is screwed into each screw hole 18A shown in FIG. 2 and the mounting plate 28A is fixed on the pedestal plate 18 as shown in FIG. 7, each guide roller 30 becomes the inclined flange of the load winding drum 22. It is arranged at a position facing the part 22C.

Thus, the rope guide 27 is connected to each bolt 3
1 and the like, the wire rope 3 (3 ') pulled out from the barrel winding drum 6 is changed by the attachment position with respect to the pedestal plate 18, as shown by a chain line in FIGS.
The inclined flange portions 22B, 22 are formed by the respective guide rollers 30.
The guide is selectively guided toward one of the inclined flanges C.

Reference numeral 32 denotes a second rope guide which is located between the drum 2 and the load winding drum 22 and is detachably provided on the base plate 18. The rope guide 32 is also similar to the rope guide 27. , A support 33, a mounting bracket 34, each guide roller 35, and the like. Each guide roller 35 is rotatably provided between each bracket portion 34A of the mounting bracket 34.

Then, as shown in FIG.
Are screwed into the screw holes 18C shown in FIG. 7 and the mounting plate 33A of the support base 33 is fixed on the pedestal plate 18.
It is arranged at a position facing C. As shown in FIG. 7, when the bolts 31 are screwed into the screw holes 18D shown in FIG. 2 and the mounting plate 33A is fixed on the pedestal plate 18, each guide roller 35 is inclined by the load winding drum 22. It is arranged at a position facing the flange portion 22B.

Thus, the rope guide 32 is connected to each bolt 3
The wire rope 3 (3 ') wound around the load winding drum 22 is changed to one of the inclined flange portions 22B and 22C by changing the attachment position to the pedestal plate 18 via 1 or the like. , And is guided toward the drum 2 of the winch 1.

The winch wire rope tension applying device according to the present embodiment has the above-described configuration.
The operation will be described.

First, when a new wire rope 3 wound around the outer periphery of the barrel winding drum 6 in a multilayer winding state is wound around the drum 2 of the winch 1, the rope guides 27, 3
1 and 2 are attached via the bolts 31 and the like, so that each of the guide rollers 30, 35 is disposed so as to face the inclined flange portion 22B of the load winding drum 22. At the same time, each guide roller 35 is arranged so as to face the inclined flange portion 22C. Then, the leading end side of the wire rope 3 is pulled out from the barrel winding drum 6 to the load winding drum 22 side, and the drawn wire rope 3 is passed between the respective guide rollers 30 to be wound in a single layer around the body 22A of the load winding drum 22. 3 ~
Wind 4 times. Then, the leading end side of the wire rope 3 is passed between the guide rollers 35 and pulled out to the winch 1 side,
Hook on the drum 2 side.

Next, the directional control valves 15, 25 of the hydraulic motors 10, 23 are returned to the neutral positions (a), (d), respectively, so that the hydraulic motors 10, 23 are disconnected from the hydraulic pump 12 and the tank 13. In this state, the drum 2 of the winch 1 is driven to rotate. And winch 1 drum 2
The pulling force is transmitted to the barrel winding drum 6 and the load winding drum 22 by pulling the wire rope 3 in the direction of arrow C in FIGS. The barrel winding drum 6 and the load winding drum 22 are forcibly rotated. At this time, with the rotation of the hydraulic motors 10 and 23, each of the relief valves 16A, 16B, 26A,
The hydraulic motor corresponding to the set pressure of 26B is the hydraulic motor 1
0, 23, whereby a rotating load (braking force) is applied to the barrel winding drum 6 and the load winding drum 22.

As a result, the wire rope 3 is connected to the barrel winding drum 6
When the wire rope 3 is unwound from the wire rope 3, a tension of, for example, about 350 to 500 kgf is given to the wire rope 3 in advance by the rotational load of the barrel winding drum 6 and the load winding drum 22. The load winding drum 22
Can be wound. In addition, wire rope 3
Is wound around the load winding drum 22, thereby increasing the frictional resistance between the wire rope 3 and the load winding drum 22, and applying a larger tension (for example, 600 to 3000 kgf / cm) to the wire rope 3 than the above-described tension. ^{About 2} )
, The wire rope 3 can be firmly wound around the drum 1 of the winch 2.

Here, the wire rope 3 is connected to the load winding drum 2
In order to keep the state in which the wire rope 3 is wound around the load winding drum 22, the wire rope 3 is fixed to the outer peripheral surface of the body 22A. You need to keep "sliding" axially along.

Since the outer diameter of the wire rope 3 is relatively larger than that of the wire rope 3 ', the contact area between the wire rope 3 and the load winding drum 22 increases accordingly. Increases, the tension applied to the wire rope 3 tends to be higher than that of a wire rope 3 'described later. When the tension applied to the wire rope 3 increases, an extremely large frictional force acts between the wire rope 3 and the load winding drum 22 as sliding resistance.

Therefore, in this embodiment, of the inclined flange portions 22B and 22C provided on both ends in the axial direction of the load winding drum 22, the inclined flange portion 22B is formed as a steep slope, and the wire rope 3 is connected to each guide. It is configured to guide toward the inclined flange portion 22B via the roller 30. Thereby, the wire rope 3 and the inclined flange portion 22
5, the wire rope 3 can be surely kept "laterally displaced" in the direction of arrow A in FIG. 5 along the inclined flange portion 22B against the sliding resistance acting between the wire rope and the wire rope. 3 can be smoothly guided in the axial direction from the inclined flange portion 22B side to the 22C side along the outer peripheral surface of the body portion 22A without stopping at the middle portion of the inclined flange portion 22B.

On the other hand, since the outer diameter of the wire rope 3 'is relatively small, the contact area between the wire rope 3 and the load winding drum 22 decreases, and the frictional resistance between the two decreases. , The tension applied to the wire rope 3 ′ tends to be smaller than that of the wire rope 3. Thereby, the sliding resistance acting between the wire rope 3 'and the load winding drum 22 is reduced. For example, when the wire rope 3' is guided toward the inclined flange portion 22B as in the case of the wire rope 3, The sliding speed when the wire rope 3 '"slides" along the inclined flange portion 22B may be excessively high.

However, in this embodiment, the inclined flange portion 22C of the load winding drum 22 is formed as a gentle slope, and the rope guides 27 and 32 are replaced via the bolts 31 and the like as shown in FIG. As a result, the wire rope 3 ′ can be guided toward the inclined flange portion 22 C side, so that the wire rope 3 ′ slides along the inclined flange portion 22 C in the “laterally displaced” in the direction of arrow B in FIG. Speed can be reduced.

As a result, when the wire rope 3 ′ is wound around the load winding drum 22, an impact when the wire rope 3 ′ collides with the previously wound wire rope 3 ′ or the body 22 A, etc. Can be suppressed, and the wire rope 3 'can be reliably prevented from waving and vibrating between the barrel winding drum 6 and the drum 2 of the winch 1 due to such an impact.

Therefore, according to the present embodiment, the wire rope 3 (3 ') is attached to the wire flange 3 (3') regardless of whether the tension applied to the wire rope 3 (3 ') is large or small. The wire rope 3 (3 ') can be guided smoothly from the inclined flange portion 22B or 22C to the body portion 22A while "sliding", by selectively guiding the wire rope 3 toward one of the inclined flange portions. The sliding speed when the wire rope 3 (3 ') "skids" can be adjusted to a relatively low speed. by this,
The middle part of the wire rope 3 (3 ') is
The wire rope 3 (3 ') can be smoothly wound in a state of being aligned with the body 22A via the 2B and 22C, preventing generation of irregular winding and the like, and applying a stable and sufficient tension to the wire rope 3 (3'). The wire rope 3 (3 ') can be strongly wound around the drum 2 of the winch 1.

Since the tension of the wire rope 3 can be changed according to the set pressure of the relief valves 16A, 16B, 26A, 26B, the magnitude of the tension can be easily confirmed using the set pressure as a guide. The magnitude of this tension can be adjusted accurately.

In the above embodiment, the wire rope 3,
3 'is wound around the load winding drum 22 only four times. Alternatively, the number of turns of the wire rope 3, 3' may be increased to five or more, or reduced to three or less. Is also good.

In the above embodiment, the wire rope 3 having the larger outer diameter is connected to the inclined flange 2 of the load winding drum 22.
Although the wire rope 3 'having a smaller outer diameter is guided toward the inclined flange portion 22C, the present invention is not limited to this. Reduce the tension and wire rope 3 '
When the tension applied to the wire rope 3
May be guided toward the inclined flange portion 22C, and the wire rope 3 'may be guided toward the inclined flange portion 22B.

Further, in the above embodiment, the body 22A is formed as a cylindrical body extending straight in the axial direction. However, the length of the body 22A may be changed to the length of the wire rope 3 instead. , 3 'may be shorter than the outer diameter. Also, a V-shaped or U-shaped trunk may be formed between the inclined flange portions 22B and 22C.

Further, in the above-described embodiment, the rotary support device is described as being used when exchanging the wire rope 3 of the hydraulic crane, but the present invention is not limited to this. It can be widely applied when exchanging a wire rope for use.

[0067]

As described above in detail, according to the present invention, the intermediate portion of the wire rope to be supplied to the winch drum is wound around the relay drum, and the rotation of the relay drum is performed. On the other hand, a load is applied by a load generating means, and the relay drum around which the wire rope is wound has first and second inclined flange portions which are enlarged at different inclination angles from the left and right sides of the body. The wire rope is selectively directed toward either the first inclined flange portion or the second inclined flange portion according to the tension to be applied to the wire rope, the outer diameter of the wire rope, or the like. The wire rope can be kept `` side-sliding '' without staying against the inclined flange portion by guiding the wire rope, and when the wire rope is `` side-sliding '' That the sliding speed of too fast can be prevented. This makes it possible to keep the middle part of the wire rope smoothly wound in a state of being aligned with the trunk via the inclined flange part, thereby preventing occurrence of irregular winding and the like, and providing a stable and sufficient tension to the wire rope. In this state, the wire rope can be strongly wound around the drum.

According to the second aspect of the invention, the first and second rope guides can be moved in the axial direction of the relay drum between the rope supply source and the relay drum and between the relay drum and the drum. And selectively guides a wire rope from the rope supply source to one of the first and second inclined flange portions of the relay drum via a first rope guide, Since the wire rope is guided from the other inclined flange portion side to the drum via the second rope guide, the wire rope is connected to one of the first and second inclined flange portions of the relay drum. The guide can be easily guided from the inclined flange portion to the relay drum and from the relay drum to the drum, and the reliability and the like of the tension applying device can be greatly improved.

Further, according to the third aspect of the present invention, the trunk of the relay drum is formed in a cylindrical shape, and the length of the trunk is at least larger than the outer diameter of the wire rope.
The wire rope can be wound in a state in which the middle part of the wire rope is securely brought into contact with the outer peripheral side of the trunk, and the frictional resistance between the wire rope and the trunk continues to apply a stable constant tension to the wire rope. Can be.

Further, according to the invention of claim 4, the load generating means is provided in the middle of a pair of main pipelines connecting the hydraulic motor to a hydraulic power source, the hydraulic motor being connected to a rotary shaft of the relay drum. When the wire rope is wound around the drum via each relay drum, the switching valve is constituted by the switching valve provided and the relief valve located between the switching valve and the hydraulic motor and provided between the pair of main pipelines. By switching the switching valve to shut off the hydraulic motor from the hydraulic power source in advance and rotating the drum in this state, a large rotating load corresponding to the set pressure of the relief valve is continuously applied to the relay drum. This eliminates the need for using a means such as a hand brake as in the prior art,
Reliability and the like can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a tension applying device for a winch wire rope according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing a tension applying mechanism in FIG.

FIG. 3 is a cross-sectional view as viewed from a direction indicated by arrows III-III in FIG. 2;

FIG. 4 is a cross-sectional view as seen from the direction of arrows IV-IV in FIG. 2;

FIG. 5 is an enlarged view of a main part showing a load winding drum in FIG. 4;

FIG. 6 is an operation explanatory diagram showing a tension applying device for a winch wire rope according to an embodiment of the present invention, together with a hydraulic circuit diagram.

FIG. 7 is an enlarged view similar to FIG. 2, showing the tension applying mechanism in a state where the attachment position of the rope guide is changed.

8 is an enlarged cross-sectional view as viewed from the direction of arrows VIII-VIII in FIG. 7;

[Explanation of symbols]

 Reference Signs List 1 winch 2 drum 3 wire rope 4 rope feeder (rope supply source) 17 tension applying mechanism 22 load winding drum 22A trunk 22B first inclined flange 22C second inclined flange 22D rotary shaft 23 hydraulic motor (load generation) Means) 24A, 24B Main pipeline 25 Directional switching valve 26A, 26B Relief valve 27 First rope guide 32 Second rope guide

Claims (4)

[Claims] 1. A winch drum for winding and unwinding a wire rope, a rope supply source installed at a position distant from the drum to supply the wire rope to the drum, and the rope A relay drum disposed between a supply source and the drum, around which a wire rope to be supplied to the drum is wound, and a load generated in rotation of the relay drum and supplied to the drum; A winch wire rope tension applying device comprising a load generating means for applying a tension to the wire rope, wherein the relay drum is located at an axially intermediate portion, and the trunk portion is wound around the outer periphery of the wire rope; A first and a second inclined flange portions, which are located on both left and right sides of the body portion and are tapered to have different inclination angles, the first and second inclined flange portions. Tensioning device-flops. 2. The relay drum is provided between the rope supply source and the relay drum so as to be movable in the axial direction of the relay drum. A first rope guide that selectively guides one of the two inclined flange portions toward one of the inclined flange portions, and is provided between the relay drum and the drum so as to be movable in the axial direction of the relay drum. The winch according to claim 1, further comprising a second rope guide for guiding the wire rope toward the drum from the other inclined flange portion side opposite to the first rope guide. Wire rope tensioning device. 3. The trunk portion of the relay drum has a cylindrical shape, and is configured to extend in the axial direction at least with a length dimension larger than an outer diameter of the wire rope.
Or the tension applying device for a winch wire rope according to 2. 4. The load generating means includes: a hydraulic motor connected to a rotary shaft of the relay drum; a switching valve provided in the middle of a pair of main pipelines connecting the hydraulic motor to a hydraulic source; The tension applying device for a winch wire rope according to claim 1, 2, or 3, further comprising a relief valve located between the valve and the hydraulic motor and provided between the pair of main conduits.