JP2012240805A - Auxiliary sheave device of crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an auxiliary sheave device mounted at the end of the boom of a crane which can prevent a lifting capability of the crane from decreasing.SOLUTION: The auxiliary sheave frame 66 of an auxiliary sheave device 1 includes a point sheave pin insertion hole 73 into which a point sheave pin 42 (pin to axially support a point sheave 41) is inserted and an idler sheave pin insertion hole 83 into which an idler sheave pin 52 (pin to axially support an idler sheave 51) is inserted.

Description

  The present invention relates to an auxiliary sheave device attached to the tip of a crane boom.

  Patent Document 1 describes a conventional auxiliary sheave device. FIG. 5 shows a peripheral portion of a conventional auxiliary sheave device 101. A bracket 170 b is provided in the auxiliary sheave device 101, and a bracket 132 is fixed (welded) to the tip of the boom 130. Then, the auxiliary sheave device 101 is fixed to the boom 130 by inserting the pin 141 into the bracket 132 and the bracket 170b.

  Auxiliary sheave devices include those for crane work and those for basic civil engineering work. The auxiliary sheave device for crane work is used when lifting a lightweight object with a ball hook or the like. The auxiliary sheave device for crane operation includes one pulley to pass one wire rope (supplementary wire rope). Further, the auxiliary sheave device for basic civil engineering work is used when working with an attachment for basic civil engineering work such as an excavating bucket. There are two auxiliary sheave devices for basic civil engineering work: a wire rope that supports the attachment for basic civil engineering work, and a wire rope that operates the attachment for basic civil engineering work (opens and closes the bucket) (support and open / close wire rope) Two pulleys are provided to pass through. In recent years, the size of excavation buckets has been increasing in order to improve excavation efficiency in basic civil engineering work.

JP 2008-74564 A

  The conventional auxiliary sheave device has the following problems. When the auxiliary sheave device is used, a large force is applied to the joint portion between the auxiliary sheave device and the tip of the boom. This force becomes particularly large when the above-mentioned basic civil engineering work is performed. Therefore, in the conventional auxiliary sheave device, the bracket 132 of the boom 130 and the peripheral portion of the bracket 132 are reinforced, and the strength of the coupling portion is secured by using a large pin 141. However, when the strength of the coupling portion is improved in this way, the weight of the tip portion of the boom 130 increases, and the lifting capacity of the crane decreases.

  Then, an object of this invention is to provide the auxiliary sheave apparatus of a crane which can suppress the reduction | decrease of the lifting capability of a crane.

  An auxiliary sheave device for a crane according to the present invention includes an auxiliary sheave frame attached to a tip end portion of a boom including a point sheave and an idler sheave, and a pulley supported by the auxiliary sheave frame. The auxiliary sheave frame includes a point sheave pin insertion hole into which a pin that pivotally supports the point sheave and an idler sheave pin insertion hole into which a pin that pivotally supports the idler sheave is inserted.

  In the auxiliary sheave device for a crane of the present invention, it is possible to suppress a decrease in the lifting capacity of the crane.

It is a figure which shows the crane provided with the auxiliary sheave device. It is a figure which shows the auxiliary sheave apparatus periphery shown in FIG. It is the figure which looked at the auxiliary sheave device periphery shown in FIG. 2 from the boom back side. It is IV-IV arrow sectional drawing of the auxiliary sheave apparatus periphery shown in FIG. It is a figure which shows the conventional auxiliary sheave apparatus periphery.

The auxiliary sheave device 1 will be described with reference to FIGS. 2 is an enlarged view of the encircled portion II of the two-dot chain line shown in FIG. 1, and is a view taken along the arrow II shown in FIG. FIG. 3 is a view taken in the direction of arrow III shown in FIG. 4 is a cross-sectional view taken along the line IV-IV shown in FIG. A one-dot chain line IVa shown in FIG. 4 corresponds to a one-dot chain line IVa portion shown in FIG.
As shown in FIG. 1, the auxiliary sheave device 1 is attached to the distal end portion of the upper boom 30 of the crane 10 (the distal end portion of the boom 20).

  The crane 10 is a construction machine provided with a boom 20, for example, a mobile crane. The crane 10 is installed in a lower traveling body 11, an upper revolving body 12 that is pivotably mounted above the lower traveling body 11, a boom 20 that is removably mounted on the upper revolving body 12, and the upper revolving body 12. A winch 13, a wire rope 14 wound and unwound by the winch 13, a hook 15 suspended from the tip of the boom 20 via the wire rope 14, and a foundation civil work attachment 16. .

  The foundation civil work attachment 16 is, for example, an excavation bucket.

  The boom 20 can be disassembled and has a lattice structure. The boom 20 includes a lower boom 21 attached to the upper swing body 12, an intermediate boom 22 connected to the lower boom 21, and an upper boom 30 connected to the intermediate boom 22 in order from the proximal end side to the distal end side. Prepare. The boom 20 may not include the intermediate boom 22, may not be disassembled, and may have a box-type structure or a telescopic structure. Hereinafter, the upper surface side of the boom 20 when the boom 20 is in the lying posture is referred to as a “boom rear surface side”, and the lower surface side of the boom 20 when the boom 20 is in the same posture is referred to as a “boom belly surface side”.

  As shown in FIG. 2, the upper boom 30 includes a point sheave 41 and an idler sheave 51 at the tip. More specifically, the upper boom 30 includes an upper boom frame 31. The upper boom 30 includes a point sheave 41, a point sheave pin 42, an idler sheave 51, and an idler sheave pin 52 provided on the upper boom frame 31. The upper boom 30 does not include a bracket (see the bracket 132 in FIG. 5) for attaching the auxiliary sheave device 1.

  As shown in FIGS. 3 and 4, the upper boom frame 31 includes a left and right side plate 31s, a back plate 31b connecting the left and right side plates 31s, and an idler sheave pin support plate 31a disposed inside the left and right side plates 31s. With. The upper boom frame 31 is configured as follows to support the idler sheave pin 52. As shown in FIG. 4, the left and right side plates 31 s protrude from the back plate 31 b toward the boom back side. The left and right idler sheave pin support plates 31a are fixed to the back plate 31b so as to protrude from the back plate 31b to the boom back side.

  As shown in FIG. 2, the point sheave 41 is a pulley provided on the boom stomach side portion of the upper boom frame 31. As shown in FIG. 1, the hook 15 is suspended from the point sheave 41 via the wire rope 14. As shown in FIG. 4, a plurality of (for example, four) point sheaves 41 are provided. One wire rope 14 is wound (multiplied) between a plurality of point sheaves 41 and hooks 15 (see FIG. 1).

  As shown in FIG. 4, the point sheave pin 42 is a shaft that pivotally supports (rotatably supports) the point sheave 41. The point sheave pin 42 is fixed to the upper boom frame 31. Specifically, the point sheave pin 42 is inserted into the left and right side plates 31 s of the upper boom frame 31. Retaining pins 43 are respectively inserted into both ends of the point sheave pin 42 protruding outward from the left and right side plates 31s.

  As shown in FIG. 2, the idler sheave 51 is a pulley provided on the boom back side portion of the upper boom frame 31. As shown in FIG. 4, a plurality (for example, three) of idler sheaves 51 are provided. For example, three idler sheaves 51 are hung with three wire ropes 14 (see FIG. 1), which are a main wire rope, a support wire rope, and an open / close wire rope. The wire rope 14 drawn out from the winch 13 shown in FIG. 1 is changed in direction by an idler sheave 51 and is hung on a point sheave 41 or an auxiliary pulley 61 (described later) shown in FIG.

  The idler sheave pin 52 is a shaft that supports the idler sheave 51 as shown in FIG. The idler sheave pin 52 is fixed to the upper boom frame 31. Specifically, the idler sheave pin 52 is inserted into the left and right side plates 31s of the upper boom frame 31 and the left and right idler sheave pin support plates 31a. That is, the idler sheave pin 52 is supported at four locations (may be supported at two locations). Retaining pins 53 are respectively inserted into both ends of idler sheave pins 52 protruding outward from the left and right side plates 31s.

(Auxiliary sheave device)
As shown in FIG. 1, the auxiliary sheave device 1 is an attachment attached to the distal end portion of the upper boom 30 (the distal end portion of the boom 20). The auxiliary sheave device 1 is a device suitable for suspending the attachment 16 for basic civil engineering work. As shown in FIG. 2, the auxiliary sheave device 1 includes an auxiliary sheave frame 66 that is attached to the tip of the upper boom 30. Further, the auxiliary sheave device 1 includes an auxiliary sheave 61 (pulley) provided on each of the auxiliary sheave frames 66 and an auxiliary sheave pin 62. The auxiliary sheave device 1 does not include a bracket (see the bracket 170b in FIG. 5) for attaching the auxiliary sheave device 1 to the upper boom 30.

  The auxiliary pulley 61 (pulley) is a sheave supported by the auxiliary sheave frame 66. The auxiliary pulley 61 is provided at the boom tip side portion of the auxiliary sheave frame 66. As shown in FIG. 3, a plurality of auxiliary pulleys 61 (for example, two) are provided. Two wire ropes 14 (see FIG. 2) of a support wire rope and an open / close wire rope are hung on the two auxiliary pulleys 61 (that is, a single wire is hooked). Note that only one auxiliary pulley 61 may be provided on the auxiliary sheave frame 66 shown in FIG. 2, the wire rope 14 may be hung, and the hook 15 (see FIG. 1) may be suspended by the auxiliary pulley 61. That is, the auxiliary sheave device 1 may be an attachment for crane work (for assisting normal crane work).

  As shown in FIG. 1, when the basic civil engineering attachment 16 is suspended by the auxiliary pulley 61, multiple third ropes (wire ropes 14) are hung on the point sheave 41 and the hook 15 is suspended from the point sheave 41. . Then, using the hook 15, for example, handling of a full turning excavator is performed. When the hook 15 is not used (for example, during excavation work), the hook 15 is fixed to the upper swing body 12.

  As shown in FIG. 3, the auxiliary sheave pin 62 is a shaft that is fixed to the auxiliary sheave frame 66 and pivotally supports the auxiliary sheave 61. Just as the point sheave pin 42 is fixed to the upper boom frame 31 using the retaining pin 43, the auxiliary sheave pin 62 is fixed to the auxiliary sheave frame 66 using the retaining pin 63.

  As shown in FIG. 2, the auxiliary sheave frame 66 includes a main body portion 70 (first frame) and a link portion 80 (second frame) connected to the main body portion 70.

  The main body 70 (first frame) is a part of the auxiliary sheave frame 66 and supports the auxiliary pulley 61. As shown in FIG. 3, the main body 70 includes left and right side plates 70 s and a connection plate 70 c that connects the left and right side plates 70 s. As shown in FIG. 2, the main body 70 includes an auxiliary sheave pin insertion hole 71, a main body side link pin insertion hole 72, and a point sheave pin insertion hole 73.

  The auxiliary sheave pin insertion hole 71 is a hole that is formed in the vicinity of the boom tip side end of the main body 70 and into which the auxiliary sheave pin 62 is inserted.

  The main body side link pin insertion hole 72 is a hole that is formed in the vicinity of the boom rear side end of the main body 70 and into which a link pin 75 (described later) is inserted.

  The point sheave pin insertion hole 73 is a hole that is formed in the main body 70 (in the auxiliary sheave frame 66) and into which the point sheave pin 42 is inserted. The point sheave pin insertion hole 73 is formed in the vicinity of the boom proximal end of the main body 70. In addition, arrangement | positioning with respect to the upper boom 30 of the point sheave pin insertion hole 73 is mentioned later.

  The link unit 80 (second frame) is a part of the auxiliary sheave frame 66. The link portion 80 is a member that connects the main body portion side link pin insertion hole 72 of the main body portion 70 and the idler sheave pin 52, and is, for example, a rod-shaped member. As shown in FIG. 3, the link portion 80 includes a link portion 80 r and a link portion 80 l and is connected to the left and right side plates 70 s of the main body portion 70 one by one. Each of the link portion 80r and the link portion 80l is a set of two plate-like members (the total number of the link portion 80 is four). Each of the link part 80r and the link part 80l may be one. As shown in FIG. 2, the link portion 80 includes a link portion side link pin insertion hole 82 and an idler sheave pin insertion hole 83.

  The link part side link pin insertion hole 82 is a hole formed in the end part on the boom tip side of the link part 80 and into which the link pin 75 is inserted. The link pin 75 is inserted into the link part side link pin insertion hole 82 and the body part side link pin insertion hole 72, and the retaining pin 76 is inserted into the link pin 75. Thereby, the link part 80 and the main-body part 70 are connected (pin-coupled).

  The idler sheave pin insertion hole 83 is a hole formed in the link portion 80 (in the auxiliary sheave frame 66) and into which the idler sheave pin 52 is inserted. The idler sheave pin insertion hole 83 is formed at the boom base end side end portion of the link portion 80.

(Details of attaching the auxiliary sheave device 1 to the upper boom 30)
As shown in FIGS. 3 and 4, the auxiliary sheave device 1 is attached to the upper boom 30 so as not to interfere with the left and right side plates 31 s of the upper boom frame 31, the point sheave 41, and the idler sheave 51. Specifically, the auxiliary sheave frame 66 is disposed inside the left and right side plates 31 s of the upper boom frame 31. More specifically, as shown in FIG. 4, the point sheave pin insertion holes 73 of the auxiliary sheave frame 66 are disposed inside the left and right side plates 31 s of the upper boom frame 31 and outside the point sheave 41. The idler sheave pin insertion hole 83 of the auxiliary sheave frame 66 is disposed inside the left and right side plates 31s of the upper boom frame 31, outside the idler sheave 51, and outside the idler sheave pin support plate 31a. Since the point sheave pin insertion hole 73 and the idler sheave pin insertion hole 83 are both holes formed in the plate-like member, the above arrangement can be easily performed. In order to prevent the position of the point sheave pin insertion hole 73 or the idler sheave pin insertion hole 83 of the auxiliary sheave frame 66 from shifting to the left and right, spacers (not shown) are provided on the point sheave pin 42 and the idler sheave pin 52. Arranged appropriately. Further, the arrangement of the auxiliary sheave frame 66 relative to the components of the upper boom 30 may be changed as appropriate. For example, the auxiliary sheave frame 66 may be attached to the outside of the left and right side plates 31 s of the upper boom frame 31.

  The auxiliary sheave frame 66 is formed so that it can be mounted and arranged as described above. That is, as shown in FIG. 2, the auxiliary sheave frame 66 is formed in a shape that can support three locations (three locations when viewed from the left and right directions) of the point sheave pin 42, the idler sheave pin 52, and the auxiliary sheave pin 62. The The auxiliary sheave frame 66 is formed so as not to interfere with the components of the upper boom frame 31 (except for the pins 42 and 52). For example, the auxiliary sheave frame 66 is formed to avoid the back plate 31b of the upper boom frame 31. Specifically, for example, the auxiliary sheave frame 66 is formed in a V shape, a U shape, a J shape, or the like when viewed from the left-right direction.

(effect)
Next, the effect of the auxiliary sheave device 1 shown in FIGS. As shown in FIG. 2, the auxiliary sheave device 1 includes an auxiliary sheave frame 66 that is attached to the tip of the upper boom 30 that includes a point sheave 41 and an idler sheave 51, and an auxiliary sheave 61 supported by the auxiliary sheave frame 66. .

(Effect 1)
The auxiliary sheave frame 66 of the auxiliary sheave device 1 includes a point sheave pin insertion hole 73 into which the point sheave pin 42 (pin that supports the point sheave 41) is inserted, and an idler sheave pin 52 (supports the idler sheave 51). An idler sheave pin insertion hole 83 into which a pin is inserted.
With this configuration, when the point sheave pin 42 is inserted into the point sheave pin insertion hole 73 and the idler sheave pin 52 is inserted into the idler sheave pin insertion hole 83, the auxiliary sheave frame 66 is fixed to the tip of the upper boom 30. . In other words, the auxiliary sheave device 1 of the upper boom 30 is provided by utilizing the (existing) point sheave pin 42 and the idler sheave pin 52 (shared pin) provided at the tip of the upper boom 30 conventionally. Fixed to the tip. Therefore, it is not necessary to provide the bracket 132 (see FIG. 5) at the distal end portion of the upper boom 30 in order to attach the auxiliary sheave device 1 to the distal end portion of the upper boom 30. Further, there is no need to reinforce the periphery of the bracket 132 (referred to as “reinforcement A”). Therefore, an increase in the weight of the tip of the boom 20 shown in FIG. 1 can be suppressed. As a result, a decrease in the lifting capacity of the crane 10 can be suppressed. In particular, when the auxiliary sheave device 1 is not used, a decrease in the lifting capacity of the crane 10 can be more reliably suppressed.

  Moreover, since the weight increase of the front-end | tip part of the boom 20 can be suppressed, the boom 20 can be lengthened (restriction of the longest boom can be reduced).

  Further, it is not necessary to provide the bracket 132 (see FIG. 5) at the tip of the upper boom 30, and it is not necessary to reinforce the periphery of the bracket 132 (reinforcement A), so that the manufacturing cost of the upper boom 30 can be reduced.

  The auxiliary sheave device 1 does not require the reinforcement A, but the following reinforcement B may be performed. That is, when the auxiliary sheave device 1 shown in FIG. 2 is attached to the upper boom 30, the point sheave pin 42, the idler sheave pin 52, and the peripheral portion thereof (hereinafter, these portions are referred to as “the periphery of the point sheave pin 42, etc.”). Therefore, it is also conceivable to reinforce the periphery of the point sheave pin 42 (reinforcement B). However, the periphery of the point sheave pin 42 and the like is configured so that high strength can be secured originally (regardless of whether or not the auxiliary sheave device 1 is attached) in order to support a suspended load with a large mass. Therefore, the reinforcement B around the point sheave pin 42 is unnecessary or a small amount is sufficient. Therefore, the effect of the reduction in the lifting capacity and the cost reduction due to the absence of the reinforcement A can be greater than the reduction in the lifting capacity and the cost increase due to the reinforcement B.

  Further, since the auxiliary sheave device 1 is fixed to the distal end portion of the upper boom 30 using the point sheave pin 42 and the idler sheave pin 52 as described above, the auxiliary sheave device 1 and the upper boom 30 are fixed. The pin 141 (see FIG. 5) is not necessary. Therefore, an increase in the weight of the tip of the boom 20 and its periphery when using the auxiliary sheave device 1 shown in FIG. 1 can be suppressed, and as a result, the lifting capacity of the crane 10 when using the auxiliary sheave device 1 can be reduced. Can be suppressed.

(Effect 2)
As shown in FIG. 2, the auxiliary sheave frame 66 includes a main body portion 70 (first frame) having a point sheave pin insertion hole 73, an idler sheave pin insertion hole 83, and a link connected to the main body portion 70. Unit 80 (second frame).
Therefore, compared with the case where the main-body part 70 and the link part 80 are integral, each of the main-body part 70 and the link part 80 can be made lightweight and compact. Since it can be made compact, each of the main body 70 and the link 80 can be easily stored. Moreover, since it can be lightweight and compact, handling (attachment, removal, transportation, etc.) of the main body part 70 and the link part 80 is easy.

(Modification)
The above embodiment can be variously modified.
For example, in the above embodiment, the auxiliary sheave frame 66 includes the main body portion 70 and the link portion 80. However, the main body portion 70 and the link portion 80 may be integrated.

1 Auxiliary sheave device 20 Boom 41 Point sheave 42 Point sheave pin 51 Idler sheave 52 Idler sheave pin 61 Auxiliary pulley (pulley)
66 Auxiliary sheave frame 70 Main body (first frame)
73 Point sheave pin insertion hole 80 Link part (second frame)
83 Idler sheave pin insertion hole

Claims (2)

An auxiliary sheave frame attached to the tip of the boom with a point sheave and an idler sheave;
A pulley supported by the auxiliary sheave frame,
The auxiliary sheave frame is
A point sheave pin insertion hole into which a pin pivotally supporting the point sheave is inserted;
An idler sheave pin insertion hole into which a pin supporting the idler sheave is inserted;
An auxiliary sheave device for a crane comprising The auxiliary sheave frame is
A first frame comprising the point sheave pin insertion hole;
A second frame having the idler sheave pin insertion hole and connected to the first frame;
The auxiliary sheave device for a crane according to claim 1, comprising:

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