JP5628622B2 - Tension generator - Google Patents

Description

  The present invention relates to a tension generating device for preventing a wire rope wound around a winch drum of a crane from being wound up randomly.

  Winch wire rope winding is a phenomenon in which the tension of the wire rope is loosened momentarily for some reason during the winding operation, causing a gap in the trough of the wire rope wound around the winch drum, which causes the drum It means that normal winding is not performed when the wire rope wound around the upper layer bites into each other or comes off the winch drum.

  Here, in the “tension generating pulley” described in Patent Document 1, oil is filled into the hollow top sheave at the tip of the boom, and an impeller for generating fluid resistance is built in the outer casing of the sheave. Appropriate tension is applied to the wire rope. As a result, according to the technique described in this document, it is possible to wind a tight wire rope around the winch drum regardless of the weight of the suspended load, and to prevent the occurrence of turbulence and damage to the wire rope. It can be done (see Patent Document 1).

JP 2001-2376 A

However, in the technique described in Patent Document 1, since the inside of the sheave outer casing is a complicated structure in which oil is filled in the hollow top sheave at the tip of the boom and the impeller for generating fluid resistance is built in the sheave, It is difficult to ensure the confidentiality of itself, and there is a risk of oil leakage.
Moreover, since the viscosity of the oil inside the sheave is not constant due to the change in the oil temperature, if the crane usage time becomes long, the oil inside becomes heated and the viscosity becomes low. Therefore, the problem that there exists a tendency for tension to become weak, so that crane use time becomes long.
Therefore, the present invention has been made paying attention to such problems, and there is no risk of oil leakage, and a tension generator capable of applying an appropriate tension to the wire rope regardless of the crane usage time. The purpose is to provide.

In order to solve the above-mentioned problems, a first aspect of the present invention is a tension generator for preventing the wire rope wound around the winch drum of the crane from winding up and is provided at the tip of the boom. A bracket, a pair of guide rollers provided on the bracket for guiding a wire rope hung on the hook from the bottom lower surface of the boom, a shoe provided at a position between the pair of guide rollers, A swing lever provided at the tip thereof with a pressing roller disposed opposite to the shoe with a wire rope interposed therebetween; and a spring that constantly biases the swing lever toward the shoe side. The lever is clamped between the pressing roller and the shoe when the urging force of the spring is stronger than the tension applied to the wire rope when the crane is unloaded. Suppresses relaxation of wire rope, at the time of the crane load, by tension applied to the wire rope is stronger than the biasing force of the spring, is swung to the pressing roller so as to be spaced apart from the shoe, said bracket The base end portion is pivotally supported coaxially with the sheave at the tip end portion of the boom, and is provided so as to be freely rotatable around the shaft .

Moreover, in order to solve the said subject, a 2nd aspect among this invention is a tension generator for preventing the random winding of the wire rope wound by the winch drum of the crane, Comprising: Boom tip part A bracket provided on the bracket, a pair of guide rollers provided on the bracket for guiding a wire rope hung on the hook from the lower surface of the tip of the boom, and a shoe provided at a position between the pair of guide rollers. A swing lever provided at the tip thereof with a pressing roller disposed opposite to the shoe across a wire rope, and a spring that constantly biases the swing lever toward the shoe, When the crane is unloaded, the swing lever is clamped between the pressing roller and the shoe because the urging force of the spring is stronger than the tension applied to the wire rope. Thus to suppress the relaxation of the wire rope, at the time of the crane load, by tension applied to the wire rope stronger than the biasing force of the spring, is swung to the pressing roller so as to be spaced apart from the shoe, the shoe There is configured to be rotatable, it characterized that you have regenerative motor is attached to the shaft coaxially.
Furthermore, in order to solve the above-described problem, in the third aspect of the present invention, in the first aspect, the shoe is configured to be rotatable, and a regenerative motor is attached coaxially with the shaft. It is characterized by that.
According to the present invention, since the configuration in which the swing lever is always urged toward the shoe by the spring is employed, there is no risk of oil leakage as in the technique described in Patent Document 1. And the structure of this invention does not use fluid resistance like the technique of patent document 1 for an action mechanism, balances with the tension | tensile_strength added to a wire rope by the urging | biasing force of a spring, and is suitable for a wire rope. Therefore, it is possible to apply an appropriate tension to the wire rope regardless of the crane usage time.
Then, if the first aspect of the present invention, the bracket has its base end, is supported by a sheave and coaxial boom tip are freely rotatably provided around the shaft Runode Even after the hook device is brought into contact with the boom tip, the hook device is rotated and stored so that it is substantially parallel to the boom longitudinal direction. The device can be stored.
Further, if the second aspect of the present invention, the shoe is configured to be rotatable, its axis coaxial to have regenerative motor is mounted Runode, during crane no load, regenerating motor having a moderate resistance When the wire rope is brought into contact with the shoe, the regenerative motor generates electricity as the winch is wound up and down. This generated electric power can be used, for example, as electric power for a winding alarm provided at the tip of the boom.
Furthermore, if it is the 3rd aspect of this invention, both the effects which the 1st and 2nd aspect of this invention show | play can be show | played.

  Moreover, if the wire rope irregular winding prevention means for holding the wire rope wound around the winch drum is further provided, the effect of preventing irregular winding is further enhanced. In particular, when the boom is extended to the maximum, there is nothing to suppress the wire rope between the tip of the boom and the winch drum at the base end position. Therefore, the effect of generating tension at the tip of the boom and pressing down the wire rope even at the winch drum portion is more suitable for suppressing flapping of the wire rope.

As described above, according to the present invention, the risk of oil leakage is rather name can impart appropriate tension to the wire rope regardless of the crane operating time.

It is a lineblock diagram explaining one embodiment of a vehicle loading crane provided with a tension generating device concerning the present invention. It is an enlarged view ((a)) of the boom front-end | tip part of the vehicle-mounted crane of FIG. 1, The same figure (b) is a right view of (a). It is a perspective view which shows typically the principal part which concerns on this invention. FIG. 2 is an enlarged view of a boom tip portion of the vehicle-mounted crane of FIG. 1 and shows a state in which a hook device is stored. BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram (at the time of a crane no load) explaining one Embodiment of the tension generator which concerns on this invention, the figure (a) is the front view, (b) is a right view of (a). It is a block diagram explaining the embodiment of the tension generator according to the present invention (when the crane is loaded). It is a figure explaining the state at the time of load of a vehicle-mounted crane provided with the tension generator concerning the present invention. It is a figure explaining the sheave of the tension generator concerning the present invention, the figure (a) is the front view, and (b) is the right view of (a). It is a figure explaining the modification of the tension generator concerning the present invention, the figure (a) is the front view, and (b) is the right view of (a).

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate.
As shown in FIG. 1, this vehicle-mounted crane (hereinafter also simply referred to as “crane”) 1 has a column 6 on a base 4 provided with outriggers 2 on the left and right so that the column 6 can turn by driving a turning hydraulic motor 5. Is provided. A boom 7 is provided at the upper end of the column 6 so that it can be raised and lowered by the operation of the boom expansion / contraction hydraulic cylinder 8 and the boom raising / lowering hydraulic cylinder 9. Further, a winch 11 is provided on the column 6 so as to be driven by a winch hydraulic motor 10, and a wire rope 12 is led from the winch 11 to the tip 7 s of the boom 7 so as to be hooked to the tip of the boom 7. The hook device 20 is suspended from the distal end portion 7s of the boom 7 by hanging the wire rope 12 around the hook 13 of the hook device 20 for hanging load through the sheave 16 of the portion 7s. As shown in FIG. 4, the hook device 20 of the crane 1 is configured such that when the hook is stored (see, for example, Japanese Patent No. 2548473), the hook device 20 is brought into contact with the tip portion 7 s of the boom 7. It is a specification with a storage device that rotates and stores the hook device 20 so as to be substantially parallel to the boom longitudinal direction. Specifically, the hook device 20 is rotated along the storage guide surface 20t around the pin 16a of the sheave 16 of the tip 7s of the boom 7.
Here, as shown in an enlarged view in FIGS. 2 and 3, the wire rope 12 wound around the winch drum (see reference numeral 11 d in FIG. 3) of the winch 11 is wound around the tip 7 s of the boom 7. A tension generator 30 is provided to prevent the above.

Hereinafter, the tension generator 30 will be described in detail.
As shown in FIG. 2, the tension generating device 30 has a bracket 31 provided at the tip 7 s of the boom 7. As shown in FIG. 2B, the bracket 31 includes two side plates 32, and the base end portion of the bracket 31 sandwiches the sheave 16 of the distal end portion 7 s of the boom 7 with the two side plates 32. The shaft 16 is pivotally supported coaxially with the pin 16a of the sheave 16, and is rotatably provided around the pin 16a.

  Here, as a sheave sandwiched at the base end portion of the bracket 31 (a sheave to which the tension generator 30 is attached), in the example of this embodiment, as shown in a perspective view of FIG. The sheave 16 that the wire rope 12 from 11 is first hooked is sandwiched. This is because it is more effective to suppress the relaxation of the wire rope 12 at a position close to the winch 11 in order to suppress the jumping of the wire rope 12 that passes through the lower surface of the boom.

  A pair of rollers 34 provided along the direction in which the wire rope 12 is stretched are disposed inside the two side plates 32 of the bracket 31. The two rollers 34 function as guide rollers for the wire rope 12 that is hung on the hook device 20 from the lower surface of the distal end portion 7 s of the boom 7. Further, a shoe 33 having an arc-shaped depression of about 1/3 circle is provided at the center position between the pair of rollers 34. A swing lever 38 is disposed opposite to the shoe 33 with the wire rope 12 interposed therebetween. In the example of the present embodiment, the swing lever 38 is also composed of a pair of plate members, and the sheave 35 is attached so as to be sandwiched between the pair of swing levers 38. In order to contact the shoe 33, a small-diameter sheave 35 having an outer ring as a contact portion is rotatably provided as a pressing roller (see FIG. 5B).

Further, springs 36 that are torsion coil springs are attached to both sides of the base end portion of the swing lever 38. As shown in FIG. 5A, the upper roller 34 (the base end side of the bracket 31) of the two rollers 34, the swing lever 38 and the spring 36 are attached by a coaxial pin 29. Yes.
One end of the spring 36 is hung on the base end portion of the swing lever 38, and the other end is hooked on the side plate 32. With this spring 36, the sheave 35 at the tip of the swing lever 38 is always on the shoe 33 side. It is energized.

  In the tension generator 30, the wire rope 12 from the boom tip 7 s passes between the roller 34 and the sheave 35 and reaches the hook device 20. More specifically, the wire rope 12 passes from the sheave 16 on the base end side of the bracket 31 through the boom tip side of the upper roller 34, then passes through the shoe 33 side of the sheave 35, and then passes through the lower roller 34. It passes through the boom tip side and is hooked on the hook device 20.

  Here, in the tension generating device 30, the sheave 35 at the tip of the swing lever 38 is urged toward the shoe 33 by the swing lever 38 and the spring 36. In particular, the sheave 35 is set so that the urging force of the spring 36 is stronger than the tension applied to the wire rope 12 when the crane is not loaded. Accordingly, the shoe 33 comes into contact with the outer ring portion of the sheave 35 so as to press it. Therefore, when no load is applied, as shown in FIG. 5 (a), the sheave 35 comes into contact with the shoe 33 and the rotation of the sheave 35 is locked, and the tension is applied by the frictional force caused by the vertical movement of the wire rope 12. Since this occurs, the relaxation of the wire rope is suppressed. On the other hand, as shown in FIG. 6, when the crane is loaded, the tension applied to the wire rope 12 is stronger than the urging force of the spring 36, so that the swing lever 38 swings so as to separate the sheave 35 from the shoe 33. It has come to be.

Next, functions and effects of the tension generator 30 will be described.
In the tension generator 30, the tension applied to the wire rope 12 is only the mass of the hook device 20 when the crane is not loaded. In addition, in the four-hanging in this embodiment, the tension applied to each wire rope 12 is ¼. Therefore, in a crane having a lifting capacity of several t, the tension of the hook device 20 is only a slight tension. It must be.

  Therefore, in this case (when no load is applied), the sheave 35 on the swing lever 38 is pressed against the shoe 33 by the spring 36 of the tension generator 30 as described above and as shown in FIGS. Accordingly, the wire rope 12 is restrained from being loosened by sandwiching the sheave 35 and the shoe 33. Therefore, the rotation due to the vertical movement of the wire rope 12 due to the operation of the winch 10 is suppressed. Further, in this tension generating device 30, the wire rope 12 is bent into a “substantially square shape” and the sheave 35 is rotated. Therefore, when the wire rope 12 moves up and down, friction is generated between the sheave 35 and the wire rope 12, and these effectively create a resistance that generates tension.

  On the other hand, as shown in FIG. 7, when a load is generated by suspending the suspended load W from the hook device 20, if tension is applied to the wire rope 12 by the suspended load W, the tension applied to the wire rope 12 is applied to the spring 36. Since the setting is stronger than the urging force, the portion of the wire rope 12 bent by the spring 36 of the tension generator 30 pushes back the sheave 35 as shown in FIG. Stretched in a straight line. Thereby, the sheave 35 is swung so as to be separated from the shoe 33. Accordingly, the rotation of the sheave 35 that has been stopped by the shoe 33 is released, and in accordance with the hoisting / lowering of the winch 10, in particular, without giving resistance to the wire rope 12, to the extent that it is not different from the conventional operation. Operation can be performed.

  Further, the tension generating device 30 is provided such that the base end portion of the bracket 31 is pivotally supported coaxially with the pin 16a of the sheave 16 of the boom distal end portion 7s, and is freely rotatable around the pin 16a. As in this embodiment, after the hook device 20 is brought into contact with the tip 7s of the boom 7, the hook device 20 is rotated and stored so as to be substantially parallel to the boom longitudinal direction (see FIG. 4). ) Even when the hook device 20 is rotated about the pin 16a along the storage guide surface 20t, the tension generating device 30 can be smoothly rotated and stored.

  As described above, according to the tension generating device 30, the structure in which the swing lever 38 is constantly urged toward the shoe 33 by the spring 36 is adopted, which is different from the conventional technique using the fluid resistance of oil. There is no risk of oil leakage, and appropriate tension can be applied to the wire rope 12 regardless of the usage time of the crane 1. Moreover, the tension | tensile_strength to the wire rope 12 which becomes weak at the time of no load can be generated with the simple apparatus which can be retrofitted.

The tension generator according to the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the valley portion of the sheave 35 is not particularly described. For example, when the wire rope 12 to be used is determined and the wire rope 12 is not changed, FIG. As shown in FIG. 8, it is preferable to provide the same “twist” as the wire rope 12 on the surface of the valley portion 35 a of the sheave 35, which is directly touched by the wire rope 12, because the resistance is further increased. When you use.)

Further, for example, in the above-described embodiment, the example in which the shoe 33 having the arc-shaped depression of about 1/3 circle is provided at the center position between the pair of rollers 34 is not limited thereto. You may comprise 33 so that rotation is possible, and you may combine a regeneration apparatus with this shoe 33 part.
Specifically, as shown in FIG. 9, the shoe 33 is configured to be rotatable, and the regenerative motor 40 is attached coaxially with the shaft. With such a configuration, when the wire rope 12 is brought into contact with the shoe 33 of the regenerative motor 40 having an appropriate resistance when the crane 1 is not loaded, the regenerative motor 40 can be operated together with the hoisting and lowering operations of the winch 11. Generate electricity. This generated electric power can be used, for example, as electric power for a winding alarm provided at the tip 7s of the boom. In this example, the sheave 35 as a pressing roller is replaced with a small-diameter roller 35 to facilitate the pressing of the wire rope 12 against the motor.

  Further, for example, in the above-described embodiment, the example in which the wire rope 12 is prevented from being wound only by the tension generating device 30 is described. However, the present invention is not limited to this, and the wire rope 12 of the winch drum 11d that exists as a conventional device. A combined use with an anti-rolling device is also possible. That is, in order to suppress the jumping of the wire rope 12 passing through the lower surface of the boom (see FIG. 3), a wire rope irregular winding prevention device (for example, Japanese Patent Laid-Open No. 2006-168874) that presses the wire rope 12 hung around the winch drum 11d. When the “drum wire rope turbulence prevention device”) is used in combination, the effect of preventing turbulence is further enhanced. In particular, when the boom 7 is extended to the maximum, there is nothing that holds the wire rope 12 between the distal end portion 7s of the boom 7 and the winch drum 11d corresponding to the base end position. Therefore, the effect of generating tension at the tip 7s of the boom 7 and pressing the wire rope 12 even at the winch drum 11d is more suitable for suppressing the flapping of the wire rope 12.

DESCRIPTION OF SYMBOLS 1 Vehicle-mounted crane 4 Base 6 Column 7 Boom 11 Winch 12 Wire rope 13 Hook 16 Sheave 20 Hook device 30 Tension generator 31 Bracket 32 Side plate 33 Shoe 34 Roller (Guide roller)
35 Sheave (pressing roller)
36 Spring 38 Swing lever

Claims (4)

A tension generator for preventing the wire rope wound around the winch drum of the crane from being overwhelmed,
A bracket provided at the tip of the boom, a pair of guide rollers provided on the bracket for guiding a wire rope hung on the hook from the lower surface of the tip of the boom, and a position between the pair of guide rollers. And a swing lever provided at the tip thereof with a pressing roller disposed so as to face the shoe with a wire rope interposed therebetween, and a spring that constantly biases the swing lever toward the shoe. And
The swing lever prevents the wire rope from being loosened by clamping the pressing roller and the shoe so that the urging force of the spring is stronger than the tension applied to the wire rope when the crane is not loaded. When the load is, the tension applied to the wire rope is stronger than the urging force of the spring, so that the pressing roller is swung away from the shoe ,
The bracket has a base end portion that is coaxially supported with a sheave at the tip end portion of the boom, and is provided so as to be freely rotatable around the shaft .   A tension generator for preventing the wire rope wound around the winch drum of the crane from being overwhelmed,
  A bracket provided at the tip of the boom, a pair of guide rollers provided on the bracket for guiding a wire rope hung on the hook from the lower surface of the tip of the boom, and a position between the pair of guide rollers. And a swing lever provided at the tip thereof with a pressing roller disposed so as to face the shoe with a wire rope interposed therebetween, and a spring that constantly biases the swing lever toward the shoe. And
  The swing lever prevents the wire rope from being loosened by clamping the pressing roller and the shoe so that the urging force of the spring is stronger than the tension applied to the wire rope when the crane is not loaded. When the load is, the tension applied to the wire rope is stronger than the urging force of the spring, so that the pressing roller is swung away from the shoe,
  A tension generator, wherein the shoe is configured to be rotatable, and a regenerative motor is attached coaxially with the shaft. The tension generator according to claim 1 , wherein the shoe is configured to be rotatable, and a regenerative motor is attached coaxially with the shaft.   The tension generator according to any one of claims 1 to 3, further comprising wire rope random winding prevention means for pressing a wire rope wound around the winch drum.

Images