JPH09315769A - Sheave and crane device using this sheave - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a sheave having a large radius of curvature, which can be mounted in a limited space. SOLUTION: A plurality of blocks 32 each having a groove 32a having a substantially U-shaped cross section are supported with a support shaft 3 with the grooves 32a facing the outer circumference.
1 is connected by a pin 33 and the support shaft 3
A plurality of balls 34 as sliding means are arranged between the block 1 and the block 32. This guide sheave 30, which is composed of a plurality of blocks 32 sliding on the outer peripheral surface of a support shaft 31 having a cross-sectional shape formed long in the longitudinal direction of the boom, receives a wire 15 fed from a winch with a large radius of curvature and is at the center of the boom. To guide you smoothly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane device configured to feed a wire from the tip of a boom that can be undulated, extended and contracted.

[0002]

2. Description of the Related Art Truck cranes, rough terrain cranes, digging column trucks, etc. are known as crane devices having a boom that can be undulated and expanded and contracted. These are configured such that a winch and a telescopic boom are mounted on a self-propelled vehicle such as a truck, and a wire stretched around the boom is unwound and wound by the operation of the winch. .

In operation, the boom is raised and extended to move the tip of the boom, where the wire is fed, to a desired position, and the winch drum is rotated to feed the wire. After a load (object) is hooked on a hook or the like provided at the tip of the wire, the winch drum is reversely rotated to wind up the wire and lift the object to a desired height.

In a crane device using a telescopic boom, in order to improve operability, when the telescopic boom is extended or shortened, the hook hung on the tip of the wire does not move vertically with respect to the tip of the boom. It is preferably designed as follows. Therefore, the wire is
The telescopic boom is hung around a plurality of sheaves arranged on a plurality of boom members and folded back to be stretched to the tip of the boom. That is, utilizing the fact that the relative position of the sheave in the boom longitudinal direction changes as the boom expands and contracts, the folded portion of the wire stretched along the boom is stretched so as to expand and contract according to the expansion and contraction of the boom.

Therefore, when the telescopic boom is telescopically assembled from the proximal boom member, the intermediate boom member, and the distal boom member, the distal end of the proximal boom member and the proximal end side of the intermediate boom member. And sheaves are respectively provided at the tip of the tip boom member, and the wires are stretched around these sheaves and stretched along the boom in a "Z" shape. Hereinafter, the sheave arranged at the tip of the base boom member is the base sheave, the sheave arranged on the intermediate boom member in the base boom member is the middle sheave, and the sheave arranged at the tip of the tip boom member. Is called the tip sheave.

When the boom is extended or shortened, the intermediate boom member is moved within the proximal boom member, so that the intermediate sheave attached to the boom proximal end side of the intermediate boom member is parallel to the upper surface of the intermediate boom member. And is housed within the limited space between the inner surface of the proximal boom member and the outer surface of the intermediate boom member. The wire pulled back from the winch to the base end side of the boom through the base end sheave is returned to the tip end side of the boom, that is, the tip end sheave by the intermediate sheave.

[0007]

The wire thus stretched is displaced in the left and right direction of the boom by the effective diameter of the intermediate sheave at the intermediate sheave at the intermediate sheave. In order to correct this misalignment inward by half the effective diameter of the intermediate sheave and feed the wire to the tip sheave along the length of the boom, it is necessary to provide a guide sheave between the intermediate sheave and the tip sheave. There is. This guide sheave
Since it is mounted on the right side or left side of the upper surface of the intermediate boom member for the purpose, it must be accommodated in a limited small space.

When the ratio of the diameter of the sheave to the diameter of the wire is small, the wire is bent tightly by the sheave, which causes a problem that the durability of the wire is impaired. According to the crane structure standard, the sheave diameter is defined to be 16 times or more the wire diameter.

The present invention has been made in view of the above problems, and an object thereof is to provide a sheave having a large radius of curvature, which can be mounted in a limited space. Furthermore, this sheave is used. The purpose is to provide a crane device.

[0010]

In order to achieve the above object, the present invention comprises a sheave composed of a plurality of blocks, a support shaft, a connecting means and a sliding means. The plurality of blocks are formed with a groove having a substantially U-shaped cross section on one side, and are connected around the support shaft by a connecting means so that the grooves are connected to each other in an annular shape toward the outer peripheral side. At this time, the slide means is arranged between the plurality of blocks and the outer peripheral surface of the support shaft. In this sheave, the blocks can continuously slide on the outer peripheral surface of the support shaft.

Since this sheave is preferably used as a guide sheave which can be installed in a limited space, the present invention is applicable to a crane device composed of a telescopic boom, a winch, a plurality of sheaves and wires. Is used as a guide sheave.

The telescopic boom includes a base boom member,
An intermediate boom member fitted and inserted in the base end boom member,
A sheave is assembled from the tip boom member fitted and inserted in the intermediate boom member, and sheaves are attached to the boom members. A proximal sheave is provided at the tip of the proximal boom member, an intermediate sheave is provided at the proximal side of the intermediate boom member, and a distal sheave is provided at the distal end of the distal boom member. These sheaves have
The wire fed from the winch is hung on the base sheave, the intermediate sheave, and the tip sheave in this order. The winch is arranged near the base of the base boom member.

The guide sheave is arranged in a limited space on the upper surface of the intermediate boom member in the proximal boom member, and guides the wire hung from the intermediate sheave to the distal sheave along the longitudinal direction of the boom. . The support shaft of the guide sheave is formed to have a cross-sectional shape extending in the longitudinal direction of the boom, for example, an elliptical shape, and a plurality of blocks are connected around this support shaft with the U-shaped groove facing the outer circumference. There is. Therefore, the guide sheave maintains the outer peripheral shape extending in the boom longitudinal direction and receives the wire with a large radius of curvature. Therefore, the wire can be guided from the intermediate sheave to the tip sheave, or vice versa, without impairing the durability of the wire. Further, since the bending force acting on the support shaft from the tension of the wire is widely dispersed in the boom longitudinal direction, it has sufficient strength against bending.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. FIG. 3 shows a mobile crane equipped with the crane device 10 according to the present invention. This mobile crane has a loading platform 3 behind the cabin 2.
And a crane device 10 mounted on the loading platform 3, and an outrigger jack 4 that is located on the front and rear sides of the truck 1 and supports the truck 1 during work.

A swivel base 11 which can be swung by a built-in motor (not shown) is disposed on the cargo bed 3, and a boom 12 is pivotally supported on the swivel base 11. In addition, the hoisting cylinder 13 is attached to the boom 12 from the lower part of the swivel base 11,
The boom 12 can be hoisted by the hoisting cylinder 13. The boom 12 includes a base boom member 12a,
The intermediate boom member 12b and the tip boom member 12c are assembled in a telescopic manner, and can be telescopically operated by a built-in telescopic cylinder (not shown). Further, a boom head 14 is attached to the tip of the tip boom member 12c.

The swivel base 11 is further provided with a winch (not shown), and a wire 15 extends from the winch winding drum along the boom 12. As will be described in detail later, the wire 15 is wound around the sheave inside the boom 12, and then is fed from the tip of the boom head 14 via the tip sheave 17 and the point sheave 18.

The wire 15 is wound around a hook sheave 16a pivotally supported inside the hook 16, and then has a tip end formed in an annular shape, and is fixed to the boom head 14 by an end pin 19. Therefore, the crane device 10 has a movable pulley and a hook sheave 16a in the hook 16 suspended by the wire 15. As shown in FIG.
The wire 15 is wound around a plurality of sheaves along the upper surface of the boom 12 and stretched in a "Z" shape.

The wire 15 first comprises a base boom member 12
It extends from the winch drum toward the distal end side of the boom 12 along the upper surface of a, and is wound around a proximal end sheave 21 provided upright on the distal end of the proximal boom member 12a. After being folded back by the base end sheave 21, the base end boom member 12a
An intermediate sheave 22 provided on the upper surface of the intermediate boom member 12b on the proximal end side.
Be hung up around. The intermediate sheave 22 is provided in a limited space between the inner surface of the upper wall of the base end boom member 12a and the upper surface of the intermediate boom member 12b. For this reason,
The wire 15 is folded laterally in the intermediate sheave 22 (at right angles to the longitudinal direction of the boom and parallel to the upper surface of the boom).
Will be misaligned to.

After the wire 15 has rotated around the intermediate sheave 22, it extends toward the tip side again, and the tip boom member 12c.
Is hung on the tip sheave 17 provided at the tip of the. At this time, the guide sheave 30 guides the lateral position of the wire 15 to the center of the boom 12 between the intermediate sheave 22 and the tip sheave 17.

For the purpose of guiding the wire 15 coming out of the intermediate sheave 22 to the center of the boom 12, the guide sheave 30 is provided inside the proximal boom member 12a in the limited space of the upper surface of the intermediate boom member 12b. The center sheave 22 is laterally offset from the center sheave 22. For this reason, space limitation is imposed on the intermediate sheave 22 and above.

Since the mounting space is limited in the lateral direction as described above, the guide sheave 30 is formed in a substantially elliptical shape, and when viewed from above the boom, the center of the wire 15 that exits the intermediate sheave 22 and enters the guide sheave 30. Line and boom 1
The intermediate boom member 12 is formed so that the triangle connecting the center line of 2 and the long axis of the guide sheave 30 draws an isosceles triangle.
It is mounted on the right side of the upper surface of b, toward the tip of the boom. Since the guide sheave 30 is arranged in this manner, the wire 15 is received by the portion having a large radius of curvature of the guide sheave 30 so as to draw a tangent line to the outer periphery of the guide sheave 30, and is guided onto the center line of the boom. . Since the wire 15 is smoothly guided in this manner, the durability of the wire 15 is not impaired by the guide sheave 30 in the crane device 10 of the present invention.

As a first embodiment of the sheave of the present invention, FIG.
And the guide sheave 30 is shown in FIG. The guide sheave 30 includes a support shaft 31 and a plurality of blocks 32.
, A pin 33 as a connecting means, and a plurality of balls 34 as a sliding means. Support shaft 31
Consists of a column portion having a substantially elliptical cross-sectional shape consisting of two radii of curvature, and flange portions formed at the upper and lower ends of the column portion, and inside and above these upper and lower flange portions. The intersecting portion is formed with the same radius as the ball 34 and is smoothly rounded all around. still,
The support shaft 31 is bolted to the intermediate boom member 12b.

A wire 15 is provided on one end side of each block 32.
A groove 32a having a substantially U-shaped cross section for receiving is formed. Further, on the other end side, both edge portions extending in the same direction as the groove 32a are cut into a concave shape with the same radius as the ball 34 to form shoulder portions 32d, and these shoulder portions 32 are formed.
A step sandwiched by d is formed in the center. Groove 3
A joint portion 32b for passing the pin 33 through is formed in a ring shape in a top view at the center of one surface perpendicular to 2a, and the joint portion 32b is provided at the center of the other surface perpendicular to the groove 32a. Two joint portions 32c for receiving the pin 33 are formed with a hole for the pin 33 to pass through. This joint portion 32b is connected to the joint portion 32c of the other block 32.
The plurality of blocks 32 can be connected in a chain manner by inserting the insert pin 33 between them.

Further, each block 32 is appropriately chamfered from the joint portions 32b and 32c to the support shaft side in a top view. For this reason, 16 blocks 32 with the grooves 32a directed toward the outer peripheral side include a plurality of balls 34 arranged in two rows in the shoulder portion 32d of the arc of the block 32, and are annularly formed by 16 pins 33. Are linked to.

In the guide sheave 30 thus assembled, the figure drawn by the bottoms of the U-grooves 32a of the continuous blocks 32 is substantially similar to the cross-sectional shape of the support shaft 31, so that the bottom of the grooves 32a, that is, The portion that comes into contact with the wire 15 is not a straight line in top view, but the support shaft 3
It is formed by a curve proportional to the larger radius of curvature of 1. Further, the diameter and the number of balls 34 are the same as those of the blocks 32.
Are always supported on the outer peripheral surface of the support shaft 31 by two balls 34.

Therefore, when the wire 15 is unwound from the winch drum or wound in the opposite direction, the wire 15 comes into contact with the bottom of the groove 32a of the block 32 as a tangent line drawn to the ellipse, and the block 32 is smoothed. It slides around the support shaft 31 in series. Further, as described above, the wire 15 is received by the portion having the large radius of curvature of the guide sheave 30, so that the wire 15 is smoothly guided to the center of the boom 12 without receiving an excessive force.

Further, since the ball 32 is used as the sliding means and the block 32 is moved lightly,
Even if the wire 15 is unwound in the unloaded state, the guide sheave 30 does not cause irregular winding of the winch drum. Furthermore, the guide sheave 30
Has a large strength in the longitudinal direction of the boom 12 in a limited space, and therefore has an advantage that the strength against bending acting from the wire to the guide sheave is large as compared with the case where a circular sheave is simply used.

In the sheave of the present invention, as shown in FIGS. 5 and 6, the roller 44 can be used as a sliding means. This guide sheave 40 as the second embodiment is also
Similar to the guide sheave 30, the support shaft 41, a plurality of blocks 42, and a pin 43 as a connecting means are included. The support shaft 41, like the support shaft 31 of the guide sheave 30, has a substantially elliptical cross-sectional shape with two radii of curvature. However, it is divided into two parts at the upper end of the column part and divided into a support shaft lower part 41b consisting of the column part and a flange part located at the lower end thereof and a support shaft upper part 41a as a flange part attached to the upper end of the column part. Has been formed. The support shaft lower part 41b is the intermediate boom member 12b.
Is welded to the support shaft lower part 41b and the support shaft upper part 41a.
Is bolted. Therefore, the support shaft upper portion 41a
Is removable and multiple blocks 4 are assembled in a ring
2 is easily removable. In addition, inside the upper and lower brim portions, a taper for guiding the roller 44 is provided on the outer peripheral surface of the column portion.

The guide sheave 40 has two types of blocks 42 and 42 '. Each block has, on one end side, a groove 4 having a substantially U-shaped cross section for receiving the wire 15.
2a, and a groove 42b having a rectangular cross section for receiving the roller 44, which is formed in the same direction as the groove 42a on the other end side. Further, at both end portions on the support shaft 41 side, the pin 4
3 is passed through to form another block, that is, a block 42 'in the case of the block 42 and joint portions 42c, 42c' connecting to the block 42 in the case of the block 42 'are formed in a ring shape in a top view. The difference between the block 42 and the block 42 'is that the inner width of this joint portion is different. The inner width of the joint portion 42c of the block 42 is
The width for receiving the roller, that is, the width of the rectangular groove 42b,
Further, the inner width of the joint portion 42c 'of the block 42' is formed so as to receive the lower end portion of the block 42, that is, the joint portion 42c. Therefore, the block 42 and the block 42 'are alternately connected in a chain manner by inserting the block 42' into the block 42 'by overlapping the joint portions 42c, 42c' and stopping it through the pin 43.

As shown in FIG. 5, eight blocks 42,
42 ′ has eight rollers 44, and is connected in an annular shape by eight pins 43 with the groove 42 a facing the outer peripheral side. In the guide sheave 40, the figure drawn by the bottom of the U groove 42a is substantially similar to the cross-sectional shape of the support shaft 41, but like the guide sheave 30, the groove 4 is formed.
The bottom portion of 2a, that is, the portion that comes into contact with the wire 15 is not a straight line in a top view, but is formed as a curve proportional to the larger radius of curvature of the support shaft 41. Further, the number of blocks 42, 42 'is determined so that there are always two or more blocks on the outer peripheral surface formed by the larger radius of curvature of the support shaft 41. For this reason, the blocks 42 and 42 'slide smoothly around the support shaft 41 fixed to the intermediate boom member 12b and guide the wire 15 as the wire 15 is paid out or taken up.

Although balls and rollers are used as the sliding means in the above embodiments, the sliding means is not limited to these, and it is also possible to simply attach a sliding member to the support shaft or the block. Further, in the above embodiment, the cross-sectional shape of the support shaft is elliptical, but various shapes can be applied depending on the mounting space or the guide method. The present invention is not limited to these, further improvements within the scope of the claims of the present invention,
It is obvious that improvements and changes can be made.

[0032]

As described above, in the sheave according to the present invention, a plurality of blocks each having a U-shaped groove on one side have an annular shape around the support shaft via the sliding means with the U-shaped groove facing the outer peripheral side. Are linked to. For this reason, although each block is continuous, it can individually slide smoothly around the support shaft, which is advantageous in that the cross-sectional shape of the support shaft is not limited to a circular shape.

The crane apparatus according to the present invention has this sheave
It is used as a guide sheave for the wire that can be hung along the telescopic boom. In a telescopic boom that is telescopically assembled from three boom members, this guide sheave has an intermediate sheave provided on the upper surface of the intermediate boom member that is moved in the proximal boom member for telescopic operation, Guide the wire to and from the tip sheave provided at the tip of the boom. In the limited installation space in the lateral direction of the boom, the guide sheave has a large radius of curvature because the support shaft has a cross-sectional shape extending in the longitudinal direction of the boom, for example, an elliptical shape. The wire can be guided at the part and smoothly guided along the boom without impairing the durability of the wire.

Also, due to the support shaft elongated in the longitudinal direction of the boom, the guide sheave has a greater strength against bending acting from the wire to the guide sheave, as compared with a circular sheave which can be mounted in the same limited space. . With this guide sheave, the crane device of the present invention ensures that the wire is "Z" along the telescopic boom while ensuring the durability of the wire.
It is possible to hang it around.

[Brief description of drawings]

FIG. 1 is a top view of a sheave according to the present invention.

FIG. 2 is a sectional side view of the sheave.

FIG. 3 is an overall side view of a crane device using a sheave according to the present invention.

FIG. 4 is a perspective view showing a boom of this crane device.

FIG. 5 is a top view showing another embodiment of the sheave according to the present invention.

FIG. 6 is a sectional side view of this sheave.

[Explanation of symbols]

 10 crane device 11 swivel base 12 boom 15 wire 30, 40 guide sheave 31, 41 support shaft 32, 42 block 33, 43 pin 34 ball 44 roller

Claims (2)

[Claims] 1. A plurality of blocks each having a groove having a substantially U-shaped cross section on one side, a support shaft, and a connecting means for connecting the plurality of blocks so that the grooves are annularly continuous toward the outer peripheral side. The block is slidably mounted on the outer peripheral surface of the support shaft by being arranged between the plurality of blocks connected around the support shaft by the connecting means and the outer peripheral surface of the support shaft. A sheave consisting of sliding means to move. 2. A telescopic assembly assembled from a base boom member, an intermediate boom member fitted and inserted in the base boom member, and a tip boom member fitted and inserted in the intermediate boom member. A free boom, a winch arranged near the base of the base boom member, a base sheave arranged at the tip of the base boom member, and a base side of the intermediate boom member. An intermediate sheave, a distal sheave disposed at the distal end of the distal boom member, a wire fed from the winch, and hung in the order of the proximal sheave, the intermediate sheave, and the distal sheave, and the proximal boom. The guide sheave according to claim 1, wherein the guide shaft is disposed in the member on the intermediate boom member and guides the wire between the intermediate sheave and the tip sheave. Crane apparatus characterized by having a VITA sectional shape.