KR100301942B1 - Crane - Google Patents

Abstract

While taking the side drum type of installing the winch drum on the side of the boom, the pleat angle of the rope is kept small.

The drum contact plane A, which is a plane orthogonal to the drum shaft 6a past the axial center point Wo of the winch drum shaft 6a, has a rope contact point of the main guide sieve 8, the undulation of the boom 2. Inclined with respect to the boom relief plane B so as to include two points P1 and P2 of the arc trajectory C drawn on the boom relief plane B.

Description

Crane {CRANE}

The present invention relates to a crane in which the winch drum for hoisting is installed in the swing frame of the upper swing body.

Background Art Conventionally, it is known to take a side drum type in which a winch drum for hoisting is usually provided on the side of a boom base in a swing frame in a wheel crane.

In the case of this side drum type, the winch drum is greatly offset to the left and right directions with respect to the boom point sheave provided at the boom tip. Therefore, when the hoist rope drawn from the winch drum is guided directly to the boom point sheave, the pleat angle It becomes too large, the peeling of the rope from the poor winding or the sieve becomes frequent, and the rope life decreases.

For this reason, in the case of the side drum type, an intermediate guide sieve is provided between the winch drum and the boom point sieve, but this alone is still between the winch drum and the intermediate guide sieve, or between the intermediate guide sieve and the boom point. The pleat angle between the sieve cannot be made small enough.

Here, as shown in Japanese Patent Application Laid-Open No. 3-64986 and Japanese Patent Laid-Open No. Hei 7-267583, the winch drum is inclined in plan view so that the end of the winch drum is positioned near the base of the boom rather than the end of the opposite side. For example, when the winch drum is arrange | positioned to the left side of a boom, the technique which tilted so that the left side of a drum may be located ahead rather than the right side in plan view is proposed.

By the way, according to this structure, the following problem remains.

The contact point of the guide sheave and the rope, which is the pleat angle support point, moves on the arc trajectory drawn on the boom relief plane by the relief operation of the boom.

On the other hand, only by inclining the winch drum in a plane view as described above, a plane perpendicular to the arc axis of the winch drum arrangement plane, that is, a plane perpendicular to the drum axis in the axial direction of the drum axis, is at most one point. Since it does not intersect only at, the pleat angle becomes large in the range beyond this intersection.

That is, a large range of pleat angles still remains wide, and problems such as a decrease in rope life cannot be sufficiently solved.

Here, this invention provides the crane which can restrain the pleat angle of a rope small, taking the side drum type.

1 is a plan view of a boom, winch and the like, showing an embodiment of the present invention;

2 is a partially enlarged side view of a boom and a winch in the embodiment;

3 is a rear view of the boom angle shown by the dashed-dotted line in FIG. 2;

4 is a view of the boom and the like viewed from both the plane and the side surface for explaining the relationship between the drum arrangement plane and the boom creeper plane;

5 is an enlarged view of FIG. 4 for explaining a maximum plural angle when the boom angle is 0 °;

FIG. 6 is a view corresponding to FIG. 5 for explaining the maximum plural angle when the boom angle is 12.01 °; FIG.

7 is a view corresponding to FIG. 5 for explaining the maximum Freight angle when the boom angle is 40 °.

(Explanation of symbols on the main parts of drawing

1: slewing frame 2: boom

3: boom footpin 4: boom point sieve

5: winch 6: winch drum

7: hoisting rope

8: Main guide sheave (rope guide means)

9: Auxiliary guide sheave (auxiliary rope guide means)

α: angle of inclination when the winch drum is viewed in plan

β: angle of inclination when the winch drum is viewed from the back

A: Drum placement plane B: Boom relief plane

C: Circular arc trajectory drawn on the boom relief plane

P1, P2: 2 points on arc trajectory

In the invention of claim 1, the boom is freely installed around the boom footpin in a swing frame of the upper swing structure mounted on the lower running body, while a winch drum is provided on the side of the boom in the swing frame. In a crane in which a hoisting rope drawn out from a drum hangs from a boom tip through a boom point sheave provided at the tip of the boom, between the winch drum and the boom point sieve on an upper surface of the boom in a stepped state. Rope guide means for installing the hoisting rope is provided, and at the same time the winch drum,

① tilted in plan so that the end of the boom side is located near the base of the boom rather than the end of the opposite side,

② It is installed to be inclined from the rear side so that the end of the boom side is lower than the end of the opposite side.

In the invention of claim 2, the boom is freely installed around the boom footpin in the swing frame of the upper swing structure mounted on the lower running body, while the winch drum is provided on the side of the boom in the swing frame. A crane in which a hoisting rope drawn out from a winch drum hangs from a boom tip through a boom point sheave provided at the tip of the boom, between the winch drum and the boom point sieve, It is installed in the rope guide means for guiding the hoisting rope, and at the same time the winch drum,

It was installed under the following conditions.

Condition

A drum arrangement plane, which is a plane orthogonal to the drum axis after the axial middle portion of the drum axis, is referred to as A,

Two points on the arc trajectory on which the rope contact as the pleat angle support point at which the hoisting rope contacts the rope guide means are drawn on the boom relief plane B by the ups and downs of the boom are called P1 and P2.

Incline with respect to the boom relief plane such that the drum placement plane (A) comprises approximately the two points (P1, P2).

Moreover, the "axial middle part of the drum" includes not only the intermediate point in a strict sense, but also a position slightly shifted from the intermediate point to the extent that the effect of the invention of claim 2 is not impaired.

In addition, the said "it includes substantially said two points P1 and P2" means not only including completely, but also including the case where it does not contain completely in the limit which does not impair an effect.

According to a third aspect of the present invention, in the configuration of claim 1 or 2, a horizontal guide sheave that is horizontal in a boom horizontal state is provided as a rope guide means.

The invention of claim 4, wherein in any one of claims 1 to 3, the pivot frame is provided with auxiliary rope guide means for guiding the hoisting rope drawn out from the winch drum to the upper surface of the boom between the rope guide means and the winch. will be.

The invention of claim 5 is the auxiliary rope guide means in which the auxiliary rope guide sheave is rotatably provided around the sieve shaft substantially parallel to the drum shaft.

In the sixth aspect of the present invention, in the configuration of the fifth aspect, the auxiliary rope guide sheave is slidably supported in the axial direction with respect to the sieve shaft.

According to a seventh aspect of the present invention, in the configuration of claim 5 or 6, the same sheave is arranged so that the contact point of the hoisting rope with respect to the auxiliary rope guide sheave is overlapped with the boom foot pin from the side.

According to the said structure, the following action can be obtained.

The boom detonation plane is a vertical plane parallel to the boom axis, whereas the drum placement plane can be expressed by the inclination angle θX as seen from the above back surface and the inclination angle θY as viewed in the plane. In addition, the intersection of the boom relief plane and the drum arrangement plane (the straight line connecting the intersections) can be expressed by Y = aX + b.

Also, on the boom relief plane, the pleat angle support point moves while drawing an arc-shaped trajectory by the relief of the boom. The intersection of this trajectory and the above formula becomes the point which can make the pleat angle smallest, and the pleat angle becomes larger as the pleat angle support point moves away from this intersection.

That is, in the configuration described in Japanese Patent Laid-Open No. 7-267583, which gives only the incline viewed from the plane, the intersection becomes vertical lines (X, O), and the intersection is limited to one point at the maximum.

On the other hand, as in the present invention, the winch drum is inclined not only when viewed in a plane but also when viewed from the rear (in Claim 2, the pleat angle support point is inclined so as to include approximately two points on the arc trajectory). Since the intersection is a line inclined parallel to the string of the arc, the intersection can be up to two points.

Therefore, it becomes possible to ensure many boom angle ranges which can make a pleat angle small.

In particular, according to the configuration of claim 2, the pleat angle is minimized at two points P1 and P2 on the arc trajectory drawn by the rope contact means in the rope guide means (guide sieve).

Accordingly, by setting the positions of the two points P1 and P2, that is, the inclination angles in two directions of the drum arrangement plane so that the change of the pleat angle through the entire relief angle range of the boom is as small as possible, the overall boom relief Through the angular range, the absolute value of the pleat angle can be reduced.

Moreover, when working only in a limited boom angle, or when there is a commonly used boom angle, it can be set so that the pleat angle may be minimum at these boom angles.

For this reason, while taking the side drum type, it is possible to prevent the occurrence of the unwinding of the hoisting rope in the winch drum and to improve the rope life.

According to the structure of claim 4, the auxiliary rope guide means is interposed between the winch drum and the rope guide means, so that the hoisting rope can be stably wound on the winch drum and released from the drum.

in this case,

i) the construction of claim 5 in which the auxiliary rope guide sheave as auxiliary rope guide means is rotatably installed around the sieve shaft approximately parallel to the drum shaft,

ii) The structure of claim 6 in which the guide sheave is freely disposed in the axial direction.

By adopting or combining these configurations, a more stable rope winding and unwinding action can be obtained, and thus the effect of preventing unwinding becomes higher.

Further, according to the configuration of claim 7, in which the rope contact with respect to the auxiliary rope guide sheave is overlapped with the boom footpin, the rope length preceding the same from the sheave does not change due to the boom's ups and downs. .

For this reason, the boom can be undulated with the hook attached to the boom by the hoisting rope.

Embodiment of the Invention

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

1 to 3, 1 is a swing frame of an upper swing structure mounted on a lower running body (not shown), and 2 is a boom provided freely with respect to the swing frame 1 around the boom foot pin 3. .

The boom 2 is freely stretched by a basic (fixed boom) 2a and a plurality of stages of the movable boom 2b .. The boom 2 includes a boom point sheave at the distal end of the tip movable boom 2b. 4) is installed.

The hoisting rope 7 withdrawn from the drum 6 of the winch 5 (only the drum 6 of the winch 5 is shown in FIGS. 2 and 3) is boom-tip sieve 4 by the boom point sieve 4. It is guided downward from, and the hook not shown is suspended by the rope 7.

The winch 5 including the winch drum 6 is pivoted at a position which is displaced to the boom 2 to the rear and at the same time to the left and right one side (right side as seen from the boom base end side in the drawing, hereinafter described in this example). It is provided in the frame 1.

In each figure, 6a is a winch drum axis as a rotation center axis of the winch drum 6, and Wo in FIG. 1 is an axial center of this winch drum axis 6a.

Accordingly, the winch drum 6 is in a state in which the winch drum 6 is largely displaced downward at the same time to the boom point sieve 4 at the same time. In such an arrangement, the winch drum 7 is directly boomed from the winch drum 6 as it is. It cannot be guided to the point sieve 4.

Here, the main guide sieve 8 is freely installed on the upper surface of the distal end of the basic boom 2a around the sieve shaft 8a, which is vertical in the boom horizontal state, and at the same time, the auxiliary guide above the winch drum 6 is provided. Guide sieve (9) is installed in the turning frame (1),

① The amount of the left and right shifts of the winch drum 6 and the boom point sieve 4 by the main guide sieve 8;

② Amounts shifted vertically between the winch drum 6 and the boom point sieve 4 by the auxiliary guide sieve 9.

It is comprised so that each may cover.

The auxiliary guide sheave 9 is, as shown in Figs.

(A) the sieve shaft 9a is approximately parallel (completely parallel or almost parallel) with the winch drum shaft 6a,

(B) With the contact with the hoisting rope (7) overlapped with the boom foot pin (3) from the side,

(C) Sliding freely in the axial direction with respect to the sieve shaft 9a.

It is installed.

By the configuration of (a) and (c), the auxiliary guide sieve 9 releases the unwinding point and the main guide sieve 8 in response to the axial movement of the unwinding point of the rope from the winch drum 6. Since it moves so as to be located on the straight line to connect, a stable rope guide action is ensured.

In addition, since the rope length of the front (boom tip side) is hardly changed by the boom ups and downs from the contact with the auxiliary guide sheave 9 of the hoisting rope 7 by the structure of (b), a hook is attached to the boom tip part. It is possible to ups and downs the boom 2 with it being fixed to it.

On the other hand, the winch drum 6 is positioned so that the end of the drum right side (opposite side of the boom 2) is in front of the left side (boom 2 side) in plan view, and the drum right side is positioned above the left side in view of the back side. It is provided in the revolving frame 1 in a state inclined in two directions with respect to an axis parallel to the boom foot pin 3. Y in FIG. 1 is the inclination angle seen from the plane, and X in FIG. 3 is the inclination angle seen from the back surface.

Here, in this embodiment, as shown in FIG. 4 as a preferable aspect of this invention,

(i) A drum arrangement plane which is a plane orthogonal to the drum shaft 6a past the axial center point Wo of the winch drum shaft 6a is referred to as A,

(ii) P1, P2 of two points on arc trajectory (C) where the rope contact (flip angle support point) for the main guide sheave (8) draws on the boom relief plane (B) by the undulation of the boom (2). By

The winch drum 6 is provided in an inclined state with respect to the boom relief plane B such that the drum arrangement plane A includes the two points P1 and P2.

By this drum arrangement, a straight line (intersecting line) L where the boom relief plane B and the winch arrangement plane A including the two points P1 and P2 and the drum axial center point Wo meet is vertical. It becomes inclined with respect to Lv.

Moreover, the said boom relief plane B means the surface parallel to the boom longitudinal axis passing through the rope contact in the main guide sieve 8.

On the other hand, the drum arrangement plane (A) includes a case where the drum arrangement plane (A) is not completely included in the limit that achieves the same effect except in addition to completely including the two points (P1, P2). In addition, the coplanar plane A includes the case where it is not only passing through the drum axial center point Wo in a strict meaning, but the case which is slightly shifted from this center point Wo.

With this configuration, the two auxiliary guides are mainly used at two points (P1, P2) on the arc of the trajectory (C), which are drawn by the rope contact point by the inclination (two-way inclination) seen from the plane of the drum arrangement plane (A). The pleat angle of the rope 7 between the eves 8 and 9 becomes minimum.

Thus, the position of the two points P1 and P2, i.e., the drum, so as to be as small as possible the change of the pleat angle through the entire relief angle range (0 ° to 80 ° in the example of FIG. 4) of the boom 2 By setting the inclination angles X and Y in the two directions of the placement plane A, the absolute value of the pleat angle can be reduced small through the entire boom relief angle range.

When a concrete example is demonstrated using FIG. 5-7 together, the boom angle when a rope contact reaches the intersection P1 will be 12.01 degrees, and the boom angle (theta) when reaching the intersection P2 will be 67.2 degrees. If the angle of inclination (X, Y) of the winch drum 6 is set as much as possible,

A) the maximum pleat angle (θ) is 1.82 ° at 0 boom angle (see FIG. 5),

B) The maximum pleat angle θ is 1.3 ° at the boom angle 12.01 ° (intersection P1) (see Fig. 6).

C) Maximum pleat angle of 1.82 ° at boom angle 40 ° (intermediate angle) (see Fig. 7)

D) The maximum pleat angle (θ) is 1.3 ° at the boom angle of 67.2 ° (intersection P2).

ㅁ) Maximum pleat angle of 1.82 ° at boom angle of 80 ° (maximum angle)

The maximum pleat angle θ can be suppressed to within 2 °, which is a legal standard value through the entire boom relief angle range.

Α in FIGS. 5 to 7 shows the maximum displacement amount in the axial direction at the point where the rope is released in the winch drum 6 in each boom angle state.

However, the above setting is one example, and the boom angles of the intersection points P1 and P2 can be changed in various ways in addition to the above.

In addition, when the work is performed only at a limited boom angle, or when there is a boom angle that is used well, the maximum pleat angle θ can be set to the minimum at these boom angles.

By the way, in the said embodiment, although the main guide sieve 8 was installed so that it might become horizontal in a boom horizontal state, it set so that the said sieve 8 might be vertical in a boom horizontal state (it makes horizontal the sieve shaft 8a). You may also do it.

On the other hand, in order to stably wind or unwind the hoisting rope 7 with respect to the winch drum 6, it is preferable to provide the auxiliary guide sheave 9 as in the above embodiment, but the present invention is, for example, a boom foot pin. By installing the winch drum 6 at approximately the same height as (3), the rope 7 is guided directly from the winch drum 6 to the main guide sieve 8 without using the copper sieve 9. It can also be applied when taking a configuration.

According to the present invention described above, the winch drum is inclined not only when viewed from the plane but also from the rear (in the invention of claim 2, the pleat angle support point is inclined so as to include approximately two points on the arc trajectory). As a result, since the intersection becomes a line inclined parallel to the string of the arc, the intersection can be made up to two points.

Therefore, it becomes possible to ensure many boom angle ranges which can make a pleat angle small.

Particularly, according to the configuration of claim 2, the drum arrangement plane is inclined with respect to the boom relief plane so that the rope contact includes two points P1 and P2 on the arc trajectory, which is drawn on the boom relief plane, so that the entire relief angle range of the boom By setting the positions of the two points P1 and P2, i.e., the inclination angles in the two directions of the winch drum, so as to be as small as possible, the absolute angle of the pleat angle can be reduced.

Moreover, when working only with a limited boom angle, or when there is a frequently used boom angle, it can be set so that the maximum plural angle may become minimum at these boom angles.

For this reason, while taking the side drum type, it is possible to prevent the occurrence of difficulty winding of the hoisting rope in the winch drum and to improve the rope life.

According to the invention of claim 4, the auxiliary rope guide means is interposed between the winch drum and the rope guide means, so that the hoist rope can be stably wound on the winch drum or released from the drum.

in this case,

i) the invention of claim 5, wherein the auxiliary rope guide sheave as auxiliary rope guide means is rotatably installed around the sieve shaft substantially parallel to the drum shaft.

ii) invention of claim 6 in which the guide sheave is freely disposed in the axial direction;

By adopting or combining these inventions, a more stable rope winding and unwinding action can be obtained, which results in a higher anti-railing effect.

Further, according to the invention of claim 7, in which the rope contact with respect to the auxiliary rope guide sieve is arranged so as to overlap with the boom footpin, the length of the preceding rope from the sieve does not change due to the ups and downs of the boom. .

For this reason, the boom can be undulated with the hook attached to the boom by the hoisting rope.

Claims (9)

The boom is freely installed around the boom footpin in the swing frame of the upper swing body mounted on the lower running body, while the winch drum is installed on the side of the boom in the swing frame, and the hoist pulled out from the winch drum In the crane which hangs from a boom tip part through the boom point sheave provided in the tip part of the boom, the rope guides the hoist rope between the winch drum and the boom point sieve on the upper surface of the boom in the insulated state. Rope guide means is provided, and at the same time the winch drum, ① tilted in plan so that the end of the boom side is located near the base of the boom rather than the end of the opposite side, (2) A crane characterized by being inclined from the rear so that the end of the boom side is positioned below the end of the opposite side. The boom is freely installed around the boom footpin in the swing frame of the upper swing body mounted on the lower running body, while the winch drum is installed on the side of the boom in the swing frame, and the hoist pulled out from the winch drum In the crane which hangs from a boom tip part through the boom point sheave provided in the tip part of the boom, the rope guides the hoist rope between the winch drum and the boom point sieve on the upper surface of the boom in the insulated state. A rope guide means is provided, and at the same time, the winch drum is installed under the following conditions. Condition A drum arrangement plane, which is a plane perpendicular to the drum axis after the axial middle portion of the drum axis, is referred to as A, The rope contact point as a pleat angle support point at which the hoisting rope contacts the rope guide means is defined as two points on the arc trajectory drawn on the boom relief plane B by the ups and downs of the boom, P1 and P2. The drum arrangement plane (A) is inclined with respect to the boom detonation plane so as to roughly include the two points (P1, P2). The crane according to claim 1 or 2, wherein as a rope guide means, a horizontal guide sheave is provided which is horizontal in a boom horizontal state. The crane according to claim 1 or 2, wherein an auxiliary rope guide means for guiding the hoisting rope drawn out from the winch drum to the upper surface of the boom between the rope guide means and the winch is provided in the swing frame. 5. The crane according to claim 4, wherein as auxiliary rope guide means, the auxiliary rope guide sheave is rotatably installed around the sieve shaft which is approximately parallel with the drum shaft. 6. The crane according to claim 5, wherein the auxiliary rope guide sheave is slidably supported axially with respect to the sheave shaft. 6. The crane according to claim 5, wherein the same sheave is arranged such that the contact of the hoisting rope with respect to the auxiliary rope guide sheave overlaps the boom footpin when viewed from the side. 4. The crane according to claim 3, wherein the swing frame is provided with auxiliary rope guide means for guiding the hoisting rope drawn out from the winch drum to the upper surface of the boom between the rope guide means and the winch. 7. The crane according to claim 6, wherein the same sheave is arranged such that the contact of the hoisting rope with respect to the auxiliary rope guide sheave overlaps the boom footpin as viewed from the side.