JP4448370B2 - Rope sheave mounting structure on crawler crane lattice jib - Google Patents

Description

  The present invention relates to a crawler crane which is a kind of mobile crane, and more particularly to a structure for attaching a rope sheave to a lattice jib of a crawler crane.

  The crawler crane is a specially developed crane with a lattice jib among various front attachments attached to a mechanical excavator excavator. The crawler crane has a traveling speed of 1 to 3 km / h. The structure is not suitable for running on public roads, but it has the advantages of excellent stability, good running performance on rough and soft terrain, and easy movement on the work site. Yes, it is widely used for construction work such as civil engineering, architecture and port construction.

FIG. 1 is a side view of a typical crawler crane disclosed in Non-Patent Document 1. FIG. In the figure, a is a lower traveling body, c is an upper swing body, b is a swing bearing that connects the upper swing body c and the lower travel body a, and d is a lattice jib. FIG. 2 is a perspective view of the lower traveling body a disclosed in Non-Patent Document 2.

Editor Japan Society of Mechanical Engineers, Book Title Mechanical Engineering Handbook, Engineering C3 Transporting Machine, Edition Number, First Edition, Japan Society of Mechanical Engineers, Date of Publication, June 1, 1991, page C3-30 Author Satoshi Ito, Book title Knowledge of mobile crane, edition number First edition, publication place Kashima Publishing Co., Ltd. Date of publication December 20, 1994, page 42

  The lower traveling body a includes a car body e and a crawler frame f attached to the left and right of the car body e. The crawler frame f has a hollow box structure, and a free wheel g is attached to the front end thereof, and a driving wheel h is attached to the rear end thereof, and a crawler shoe j is attached to surround them. The car body e and the crawler frame f are coupled by a crawler coupling device. The crawler coupling device penetrates the four axles m extending in the left-right direction at the front end and the rear end of the car body e and the middle part in the front-rear direction of the crawler frame f, and circumscribes the axle m slidably. This is a combination of a hollow axle box n, and the distance between the left and right crawler frames f can be adjusted by expanding and contracting the crawler telescopic cylinder k. s is a lower roller. u is a winding wire rope.

  A driving diesel engine, a hydraulic pump, a hydraulic oil tank, a main winch, an auxiliary winch, and the like are attached to the upper swing body c in addition to the cab i and the lattice jib d. p is a jib back stop, and the tilt angle of the jib is limited to a required value (for example, 80 °) for safety. For general construction, those up to 50t that can be transported without disassembling the main body are often used, and larger ones are transported with the main body disassembled. The vehicle is driven by a pair of left and right crawlers, but the hydraulically driven one can move the left and right crawlers at different speeds or move in the opposite direction for high mobility. Many small machines use a hydraulic cylinder to reduce the width between the left and right crawlers during transportation, and large machines remove the crawler during transportation.

  As described above, the lattice jib limits the tilt angle to a required value (for example, 80 °) for safety. Therefore, cargo handling work with a small work radius is not possible. The present invention has been devised in view of such problems of the prior art. A rope sheave is attached in the middle of a lattice jib of a crawler crane, and then a cargo handling work hook is hung so that a cargo handling work with a small work radius can be performed. An object of the present invention is to provide a structure for attaching a rope sheave to a lattice jib of a crawler crane that can be made.

An apparatus called a tag line is a structure in which a rope sheave is attached in the middle of a lattice jib. 3A and 3B are explanatory diagrams of the tag line disclosed in Non-Patent Document 3, wherein FIG. 3A is a side view of a crawler crane to which the tag line is attached, and FIG. 3B is a perspective view of a spring-type tag line. In the figure, q is a clamshell bucket which is an attachment for excavation work, and a bucket operated by an opening / closing rope and a support rope is suspended and dropped to grab dirt and the like. r is a tag line, and the clamshell bucket is pulled lightly with a rope to prevent shaking and rotation. The tag line r is supported by a torsion spring and has a rope sheave t around which a tag line rope is wound.

Editor Japan Crane Association, Book Title Safety of Mobile Crane Operation, Number of Editions First Edition, Issuer Japan Crane Association, Date of Publication January 31, 1994, Page 152

  However, since the force applied to the tag line rope is small, the rope sheave t around the tag line rope attached to the lattice jib is different from the rope sheave of the load handling work rope that applies a large force as in the present invention. The structure is completely different from that of the present invention.

  In order to achieve the above object, the rope sheave mounting structure of the crawler crane to the lattice jib of the present invention has a rope sheave attached in the middle of the crawler crane lattice jib, and a winding wire rope is wound around the rope sheave, so that a small working radius can be obtained. A rope sheave attachment structure to a lattice jib that enables loading and unloading work, comprising a support rod having a rope sheave rotatably attached to an intermediate portion, and a pair of support brackets that support both ends of the support rod at the intermediate portion. One end of the support bracket is supported by a connecting pin of a lattice jib, and the other end is fastened by a bolt to a bar of the lattice jib.

  It is preferable that the support bracket is bent in a U-shape and the support rod is supported by the bent portion.

  The diameter of the rope sheave in the middle of the lattice jib is preferably substantially the same as the diameter of the rope sheave of the wire rope for cargo handling attached to the tip of the lattice jib.

  The other end of the support bracket is preferably fastened with a U-bolt so as to hold a lattice jib bar.

  As described above, the structure for attaching the rope sheave to the lattice jib of the crawler crane of the present invention has the following excellent effects. Because the rope sheave is attached in the middle of the crawler crane lattice jib, even if the inclination angle of the lattice jib is limited to the required value (for example, 80 °), the hook for cargo handling work can be moved closer to the crawler crane body. It is possible to carry out cargo handling work with a small work radius. The rope sheave is mounted in the middle of the support rod, both ends of the support rod are supported by a pair of support brackets, one end of the support bracket is supported by a connecting pin of the lattice jib, and the other end is fastened by a bolt to the bar of the lattice jib. Therefore, the structure is sturdy, and even if a large force is applied to the rope sheave during loading / unloading work, the position of the rope sheave is not shifted and the mounting structure is not damaged, which is highly safe.

  Since the support bracket is bent in a U-shape and the support rod is supported by the bent portion, the rope sheave is mounted so as to protrude from the lower surface of the lattice jib, and the winding wire rope can be easily wound. Since the diameter of the rope sheave in the middle of the lattice jib is substantially the same as the diameter of the rope sheave of the winding wire rope attached to the tip of the lattice jib, the winding wire rope is not damaged.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a drawing of the lower lattice jib, (A) is a plan view, and (B) is a side view. FIG. 5 is an AA arrow view of FIG. FIG. 6 is a side view of the crawler crane, and shows a state where the inclination angle of the lattice jib is 30 °, 60 ° and 80 °. FIG. 7 is an assembly view of a rope sheave provided near the base end of the lattice jib, (A) is a plan view, and (B) is a side view. In these drawings, the same parts as those described in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description is omitted.

  4 to 6, 1 is a crawler crane, and 2 is a lattice jib. The lattice jib 2 includes a lower lattice jib 2 a and an upper lattice jib 2 b, which are connected by four jib joint pins 12. The jib joint pin 12 has a frustoconical shape at both ends as shown in FIGS. 3 is a winding wire rope when the intermediate rope sheave 8 is used, and 4 is a winding wire rope when the tip rope sheave 6 is used. Reference numerals 5 and 5a denote hoist winches, which are arranged side by side and are driven separately. Reference numeral 6 denotes a tip rope sheave attached to the tip of the lattice jib 2, and reference numeral 8 denotes an intermediate rope sheave attached to the middle of the lattice jib 2 using the jib joint pin 12. The tip rope sheave 6 and the intermediate rope sheave 8 have substantially the same diameter.

  Reference numeral 7 denotes a rope sheave mounting structure for mounting the intermediate rope sheave 8 to the lattice jib 2. The rope sheave mounting structure 7 includes a support rod 9 having an intermediate rope sheave 8 rotatably attached to the center, and a pair of support brackets 10 that support both ends of the support rod 9 at intermediate portions. One end of the support bracket 10 is supported by a connecting pin 12 of a lattice jib, and the other end is fastened to a bar 2c of the lattice jib 2 by a U bolt 14.

  The support rod 9 is a cylindrical rod and supports the intermediate rope sheave 8 via a ball bearing 8a at the center in the length direction. The pair of support brackets 10 are two pieces in which the left and right ends of the support rod 9 are inserted and the sleeve 10a is bent like a boomerang and the sleeve 10a is welded through the bent portion. Plate 10b, 10c. 10d is a gusset provided to reinforce the welded portion between the sleeve 10a and the inner plate 10c. Reference numeral 9a denotes a pin for stopping the support rod 9 from coming off the sleeve 10a.

  One end of the two bent plates 10b and 10c constituting the support bracket 10 is provided with a hole through which the connecting pin 12 of the lattice jib passes, so that the connecting portion of the bar 2c of the lattice jib 2 is sandwiched between them. It is supported by the connecting pin 12. The other ends of the two bent plates 10b and 10c are welded to one side of the groove-type bracket 10e as shown in FIG. The other side of the groove-shaped bracket 10e is fastened with a U bolt 14 so as to hold the bar 2c of the lattice jib 2.

  Reference numeral 11 denotes a tubular spacer, which is externally fitted to the support rod 9 between the sleeve 10a and the ball bearing 8a, and holds the ball bearing 8a so as not to move left and right. Reference numeral 13 denotes a rod stretched between the two plates 10c in the vicinity of the outer diameter of the intermediate rope sheave 8, and is used to prevent the winding wire rope 3 from coming off the intermediate rope sheave 8. A hook 15 is attached to the hoisting wire rope 4. Reference numeral 16 denotes a sulcan hook attached to the hoisting wire rope 3 and is rotatable around an axis. An overwinding prevention device 17 has a limit switch and regulates the upper limit on the winding of the hooks 15 and 16.

  Reference numeral 18 denotes a rope sheave for the hoisting wire rope 3 provided near the base end of the lattice jib 2. As shown in FIG. 6, the hoisting wire rope 3 extends from the hoisting winch 5 to the sarkan hook 16 through the rope sheave 18 and the rope sheave 6. This rope sheave 18 is also used when the hoisting wire rope 3 is used as a drag line. The drag line means that the bucket suspended from the tip of the lattice jib 2 by the hoisting wire rope 4 is operated to release it into the air by operating the drag rope, the drag rope is pulled toward you, and the bucket is moved along the ground for excavation. Device. For this reason, the wire rope is prevented from coming off.

  As shown in FIG. 7, the rope sheave 18 includes a bracket 18a attached to the front end of the upper swing body c, a hollow cylindrical support member 18b rotatably supported about the axis at the front end of the bracket 18a, and a support member 18b. Side-view substantially U-shaped sheave support member 18c fixed to the front end, a pair of rope sheaves 18d supported side by side by the sheave support member 18c, and the front end of the sheave support member 18c side by side. It comprises a pair of rods 18e that are rotatably supported. The hoisting wire rope 3 passes through a hollow portion of the hollow cylindrical support member 18b. The pair of rope sheaves 18d have outer diameters in contact with each other, and a gap through which the hoisting wire rope 3 can pass is provided between the pair of rods 18e.

  Next, the operation and effect of this embodiment will be described. Since the rope sheave 8 is attached in the middle of the lattice jib 2 of the crawler crane 1, even if the inclination angle of the lattice jib 2 is limited to a required value (for example, 80 °) for safety, the position of the salcan hook 16 for cargo handling work is crawled. The crane 1 can be brought close to the main body, and cargo handling work can be performed with a small work radius. The rope sheave 8 is mounted in the middle of the support rod 9, both ends of the support rod 9 are supported by a pair of support brackets 10, one end of the support bracket 10 is supported by a connecting pin 12 of a lattice jib, and the other end is a lattice jib 2. Because it is fastened to the bar 2c with U-bolts, the structure is strong, and even if a large force is applied to the rope sheave 8 during cargo handling work, the position of the rope sheave 8 will not be displaced and the mounting structure will not be damaged. High safety.

The support bracket 10 is bent in a U-shape, and the support rod 9 is supported by the bent portion. Therefore, the rope sheave 8 is mounted so as to protrude from the lower surface of the lattice jib 2, and the winding wire rope 3 is wound around. Is easy. The diameter of the rope sheave 8 in the middle of the lattice jib 2 is substantially the same as the diameter of the rope sheave 6 of the winding wire rope 4 attached to the tip of the lattice jib 2, so that the winding wire rope 3 is not damaged.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the invention.

1 is a side view of a typical crawler crane. It is a perspective view of a lower traveling body. It is explanatory drawing of a tag line, (A) is a side view of the crawler crane which attached the tag line, (B) is a perspective view of a spring type tag line. It is drawing of the lower lattice jib which provided the attachment structure of the rope sheave of this invention, (A) is a top view, (B) is a side view. It is an AA arrow line view of FIG. It is a side view of the crawler crane which provided the attachment structure of the rope sheave of this invention. It is an assembly drawing of the rope sheave provided near the base end of the lattice jib, (A) is a plan view, (B) is a side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Crawler crane 2 Lattice jib 3 Hoisting wire rope 7 Rope sheave attachment structure 8 Intermediate rope sheave 9 Support rod 10 Support bracket 12 Connection pin 14 U bolt

Claims (4)

A rope sheave is attached to a lattice jib that has a rope sheave attached in the middle of the lattice jib of a crawler crane, and a hoisting wire rope is wound around the rope sheave so that the cargo can be handled with a small working radius. It consists of a support rod on which a rope sheave is freely attached, and a pair of support brackets that support both ends of the support rod at intermediate portions. One end of the support bracket is supported by a connecting pin of the lattice jib, and the other end is a bar of the lattice jib. A structure for attaching a rope sheave to a lattice jib of a crawler crane characterized by being fastened with bolts. 2. The structure for attaching a rope sheave to a lattice jib of a crawler crane according to claim 1, wherein the support bracket is bent in a dogleg shape and the support rod is supported by the bent portion. The rope sheave mounting structure of a crawler crane to a lattice jib according to claim 1 or 2, wherein a diameter of the intermediate rope sheave of the lattice jib is substantially the same as a diameter of the rope sheave of the hoisting wire rope attached to the tip of the lattice jib. 4. The structure for attaching a rope sheave to a lattice jib of a crawler crane according to any one of claims 1 to 3, wherein the other end of the support bracket is fastened with a U-bolt so as to hold a bar of the lattice jib.

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