Winch drum

Abstract

To provide a winch drum that is able to easily and firmly fix an end of a wire rope even if the wire rope has a large diameter.SOLUTION: A winch drum includes: a cylindrical winding drum 33 that winds a wire rope 36; a flange portions 35 provided at both ends of the winding drum; and a wedge-shaped member 37 that fixes an end part of the wire rope. A mounting hole 38, into and from which the wedge-shaped member can be inserted and removed, is formed in one end of the winding drum. The mounting hole has a tapered shape from a large opening 38a to a small opening 38b, which are different in size. The wedge-shaped member includes an inner member 39 and an outer member 40 whose contact surfaces 39a, 40a inclined with respect to a pulling direction of the wire rope are brought into contact with each other. An end part of the wire rope 36 and the outer member 40 are joined by brazing.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a winch drum, and more particularly to a winch drum used in construction machines such as cranes, pile drivers, and earth drills. [Background technology]

[0002] In a winch drum for winding ropes used in various construction machines, flanges are generally provided on both ends of a cylindrical hoisting drum that winds up the wire rope, and an attachment hole is formed inside the hoisting drum into which a cotter (wedge-shaped member) around which the end of the wire rope is wound is inserted. As a result, even if a force is applied in the direction in which the wire rope is pulled out from the hoisting drum, the cotter bites into the rope end (tail end) and tightens it even more firmly to prevent it from coming loose (see, for example, Patent Document 1).

[0003] Furthermore, in the case of a thick wire rope, since it is difficult to wind the end of the wire rope around a cotter, a simple plate clamping method has been proposed in which the rope end is clamped between fixed plates and fixed with bolts (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-347680 A [Patent Document 2] JP 2016-120979 A Summary of the Invention [Problem to be solved by the invention]

[0005] Comparing various methods for fixing wire ropes, the wedge method described in Patent Document 1 is preferable in terms of reliability, while the plate clamping method described in Patent Document 2 is preferable in terms of ease of assembly. However, in the methods for fixing wire ropes, there is a trade-off between improved reliability and improved ease of assembly, and there is a problem in that it is difficult to achieve both at the same time.

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a winch drum that can easily and firmly secure the end of a wire rope, even if the wire rope has a large diameter. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the winch drum of the present invention comprises a cylindrical hoisting drum for winding up a wire rope, flange portions provided at both ends of the hoisting drum, and a wedge-shaped member for fixing the end of the wire rope, and an attachment hole through which the wedge-shaped member can be inserted and removed is formed inside one end of the hoisting drum, the attachment hole has a tapered shape from a large opening to a small opening of different sizes, the wedge-shaped member consists of an inner member and an outer member which abut against each other with abutment surfaces inclined with respect to the pulling direction of the wire rope, and the end of the wire rope and the outer member are joined by brazing.

[0008] The outer member is sized to pass through the small opening. The abutment surfaces are paired with a concave surface and a convex surface that are uneven in the width direction of the mounting hole in a cross-sectional view of the wedge-shaped member. In addition, the inner member is characterized in that, when the inner member is integrally provided in the mounting hole with the outer member, the front end of the inner member in the insertion direction into the mounting hole is aligned with the edge of the large opening. Effect of the Invention

[0009] According to the winch drum of the present invention, the wedge-shaped member that fixes the end of the wire rope to the mounting hole is composed of an inner member and an outer member that abut each other with abutment surfaces inclined with respect to the pulling direction of the wire rope, and the end of the wire rope and the outer member are joined by brazing, so that the wire rope itself can have a wedge function, and the work of folding back the wire rope that was previously required can be eliminated, and yet the end of the wire rope can be firmly fixed by obtaining the same wedge effect as in the past. In other words, a winch drum that can easily and firmly fix the end of the wire rope is achieved, even if the wire rope has a large diameter.

[0010] In addition, since the outer member is formed to a size that allows it to pass through the small opening, the wire rope can be fixed to the winch drum efficiently. Furthermore, since the contact surfaces of the inner member and the outer member are paired with a concave curved surface and a convex curved surface that are uneven in the width direction of the mounting hole in a cross-sectional view of the wedge-shaped member, the positional relationship between the inner and outer members can be aligned when the wedge-shaped member is inserted into the mounting hole, and the quality of the fixed state is excellent. In addition, since the front end of the inner member in the insertion direction into the mounting hole is aligned with the edge of the large opening, the workability of the wire rope fixing work is improved, and the quality can be easily checked visually after the work, making it more practical. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a plan view showing an example of a winch drum of the present invention. [Diagram 2] FIG. 4 is a partial cross-sectional side view of the winch drum. [Diagram 3] 1 is a partially cross-sectional side view showing a fixing structure (wedge structure) of a wire rope to a winch drum. [Figure 4] FIG. [Diagram 5] FIG. 5 is a cross-sectional view of FIG. 4 . [Figure 6] FIG. 1 is a side view of an earth drill showing an example of a construction machine to which the winch drum of the present invention can be applied. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] 6 shows an earth drill, which is an example of a construction machine to which the winch drum of the present invention can be applied. This earth drill 11 includes a base machine 14 in which an upper rotating body 13 is rotatably mounted on a lower traveling body 12 equipped with a traveling device, a boom 15 mounted on the front part of the upper rotating body 13 so as to be able to be raised and lowered, a foldable gantry 16 provided on the rear upper part of the upper rotating body 13, a counterweight 17 provided on the rear end part of the upper rotating body 13, a plurality of winches 18, 19, 20 mounted on the center in the width direction of the upper rotating body 13, and a cab 21 provided on the right front end part of the upper rotating body 13.

[0013] A kelly bar drive unit 22 is held at the front of the boom 15 via a plurality of arms 22a and cylinders 22b as equipment for the earth drill, and a kelly bar 25 passing through the kelly bar drive unit 22 is hung from a main hoisting rope 24 hanging down from a top sheave 23 provided at the upper end of the boom 15, and an excavation bucket and a bottom-enlarging bucket 26 are attached to the lower end of the kelly bar 25. Furthermore, an auxiliary hoisting rope 27 hangs down from the top sheave 23, and a derricking rope 29 is connected to the rear side of the boom 15 via a pendant rope 28.

[0014] The main hoisting rope 24, auxiliary hoisting rope 27 and derricking rope 29 are wound around the winches 18, 19 and 20, respectively, and excavation work is performed by operating the first winch 18 to raise and lower the excavation bucket or bottom-expanding bucket 26 via the kelly bar 25 by the main hoisting rope 24 while rotating the excavation bucket or bottom-expanding bucket 26 via the kelly bar 25 by the kelly bar drive device 22. Therefore, a large load acts on the main hoisting rope 24 when raising the excavation bucket or bottom-expanding bucket 26 that has taken in the excavated soil and sand, and the first winch 18 is used under a high load.

[0015] 1 to 5 show an embodiment of the winch drum of the present invention having a structure suitable for use in the first winch 18 of an earth drill used under high load as described above. The winch drum 31 shown in this embodiment is basically formed in the same manner as a conventional winch drum, and as shown in Figs. 1 and 2, includes a cylindrical hoisting drum 33 having a spiral rope groove 32 for aligning the first layer of main hoisting rope 24 (hereinafter referred to as wire rope) on its outer circumferential surface, a pair of flanges 34, 35 provided at both ends of the hoisting drum 33, and a block-shaped wedge member 37 for fixing the end of the wire rope 36. An attachment hole 38 is formed inside one end of the hoisting drum 33, which is inside one of the flanges 35, and through which the wedge member 37 can be inserted and removed.

[0016] The mounting hole 38 is provided in a direction perpendicular to the axial direction of the hoisting drum 33 (left and right direction in FIG. 1), and has a tapered shape from a large opening 38a to a small opening 38b of different sizes. As shown in FIG. 4, the wedge-shaped member 37 is composed of an inner member 39 (in this embodiment, a trapezoid having upper and lower bases perpendicular to the pulling direction of the wire rope 36 in a plan view) and an outer member 40 (in this embodiment, a right-angled trapezoid having upper and lower bases perpendicular to the pulling direction of the wire rope 36 in a plan view) that abuts against each other abutting surfaces 39a, 40a inclined from the extension side end of the wire rope to the distal side end in the same manner as the mounting hole 38 with respect to the pulling direction of the wire rope 36 (arrow direction in FIG. 4), and the end of the wire rope 36 and the outer member 40 are joined by brazing.

[0017] Brazing is generally a method of joining metal members (base materials) to be joined by melting an alloy (brazing material) with a lower melting point than the base materials and using it as a kind of adhesive to join the members without melting the base materials themselves. In this embodiment, the brazing process is incorporated into the process of performing terminal treatment of the wire rope 36, and for example, the wire of the wire rope 36 is passed through the through hole 40b of the outer member 40, and the brazing material applied between the two is heated and melted.

[0018] The outer member 40 is formed to a size that allows it to pass through the small opening 38b, and is inserted into the mounting hole 38 through the small opening 38b together with the wire rope 36. On the other hand, the inner member 39 is inserted into the mounting hole 38 through the large opening 38a on the opposite side to the small opening 38b for assembly purposes.

[0019] 3, when the inner member 39 is integrally provided in the mounting hole 38 with the outer member 40, its front end 39c in the insertion direction into the mounting hole 38 (the right end in FIG. 3) is aligned with the edge (upper edge) 38e of the large opening 38a. In this state, the inner member 39 is accommodated inside the imaginary circumferential surface S that passes through the bottommost portion 32a of the rope groove 32, so that the alignment of the wire rope 36 in the rope groove 32 is not hindered.

[0020] The inner and outer members 39, 40 are aligned in the width direction of the mounting hole (up and down direction in FIG. 4) with their abutment surfaces 39a, 40a in contact with each other, and their side surfaces 39b, 40c (one side surface 39b is a tapered surface) opposite the abutment surfaces 39a, 40a are aligned with the corresponding side wall surfaces 38c, 38d of the mounting hole 38. When tension is applied to the wire rope 36 in this aligned state, the force is resolved into forces perpendicular to the side surfaces 39b, 40c of the inner and outer members 39, 40, and transmitted as a large force (pressing force) to the side wall surfaces 38c, 38d of the mounting hole 38 (FIG. 4).

[0021] As shown in Fig. 5, the wedge-shaped member 37 has a slight gap in the thickness direction (left-right direction in Fig. 5) when inserted into the mounting hole 38, and the thickness of the inner member 39 is slightly smaller than the thickness of the outer member 40. The abutment surfaces 39a, 40a of the members 39, 40 are paired with a concave curved surface 39a and a convex curved surface 40a that are uneven in the mounting hole width direction (up-down direction in Fig. 5) in a cross-sectional view of the wedge-shaped member 37, and these uneven curved surfaces 39a, 40a are formed with the same curvature. On the other hand, the side surfaces 39b, 40c opposite the abutment surfaces 39a, 40a are both formed in a convex curved shape, and a stable surface contact state is ensured when pressing the side wall surfaces 38c, 38d of the mounting hole 38 having a curved shape that matches the abutment surfaces 39a, 40a.

[0022] When replacing the wire rope in the winch drum 31 thus formed, the end of the used wire rope is removed from the hoist 33, and the end of the new wire rope 36 (the outer member 40) is inserted into the small opening 38b. Then, the inner member 39 (not new but reused) is inserted into the large opening 38a, and the inner and outer members 39, 40 are arranged in the width direction of the mounting hole, and tension is applied to the wire rope 36 in a predetermined procedure. When the wedge-shaped member 37 bites into the mounting hole 38, the inner member 39 is also aligned with the direction of the outer member 40 due to the slight movement of the outer member 40, and the wedge-shaped member 37 is held in a stable state within the mounting hole 38. That is, the biting of the wedge-shaped member 37 tightens the wire rope 36 even more firmly, so that the end of the wire rope 36 does not come off the mounting hole 38.

[0023] Thus, according to the winch drum 31 of the present invention, the wedge-shaped member 37 that fixes the end of the wire rope 36 to the mounting hole 38 is composed of the inner member 39 and the outer member 40 that abut the abutment surfaces 39a, 40a inclined with respect to the pulling direction of the wire rope 36, and the end of the wire rope 36 and the outer member 40 are joined by brazing, so that the wire rope itself can have a wedge function, and the work of folding back the wire rope that was conventionally required can be eliminated, and yet the end of the wire rope 36 can be firmly fixed by obtaining the same wedge effect as in the conventional case. In other words, a winch drum 31 that can easily and firmly fix the end of the wire rope 36 is achieved, even if the wire rope 36 has a large diameter.

[0024] In addition, since the outer member 40 is formed to a size that allows it to pass through the small opening 38b, the wire rope 36 can be fixed to the winch drum 31 efficiently. Furthermore, the abutment surfaces 39a, 40a of the inner member 39 and the outer member 40 are paired with the concave curved surface 39a and the convex curved surface 40a that are uneven in the mounting hole width direction in the cross-sectional view of the wedge-shaped member 37, so that the positional relationship between the inner and outer members 39, 40 can be matched with each other in a state where the wedge-shaped member 37 is assembled in the mounting hole 38, and the quality of the fixed state is also excellent. In addition, since the front end 39c of the inner member 39 in the insertion direction into the mounting hole 38 is aligned with the edge 38e of the large opening 38a, the workability is improved in the fixing work of the wire rope 36, and the quality check after the work can be easily performed visually, making it more practical.

[0025] The present invention is not limited to the above-mentioned embodiment, and the effect becomes more pronounced when the wire rope is applied to a thick and highly straight wire rope (for example, a diameter of 20 to 30 mm). The shape and size of the wedge-shaped member are arbitrary, and the brazing of the outer member can be performed by various methods in which the brazing material is placed at a predetermined location and then melted. Furthermore, the brazed wire rope is particularly effective for the main hoisting rope of an earth drill, which is frequently replaced on site, but is not limited to this, and can be used as a replacement part (wire rope kit) for various conventional winch drums, greatly contributing to easy and quick replacement and safe operation. [Explanation of symbols]

[0026] 11...Earth drill, 12...Lower running body, 13...Upper rotating body, 14...Base machine, 15...Boom, 16...Gantry, 17...Counterweight, 18, 19, 20...Winch, 21...Operator's cab, 22...Kelly bar drive device, 22a...Arm, 22b...Cylinder, 23...Top sheave, 24...Main hoisting rope, 25...Kelly bar, 26...Expanded bottom bucket, 27...Auxiliary hoisting rope, 28...Pendant rope, 29...Deriving rope, 31...winch drum, 32...rope groove, 32a...bottom, 33...hoisting drum, 34, 35...flange, 36...wire rope, 37...wedge-shaped member, 38...mounting hole, 38a...large opening, 38b...small opening, 38c, 38d...side wall surface, 38e...edge, 39...inner member, 39a...contact surface (concave curved surface), 39b...side surface, 39c...front end in insertion direction, 40...outer member, 40a...contact surface (convex curved surface), 40b...through hole, 40c...side surface

Claims

1. A winch drum is provided with a cylindrical hoisting drum for winding a wire rope, flanges provided at both ends of the hoisting drum, and a wedge-shaped member for fixing the end of the wire rope, and an attachment hole is formed inside one end of the hoisting drum so that the wedge-shaped member can be inserted and removed. The mounting hole has a shape that tapers from a large opening to a small opening of different sizes, The wedge-shaped member includes an inner member and an outer member, the inner member and the outer member having abutment surfaces inclined with respect to the pulling direction of the wire rope, the abutment surfaces abutting against each other, A winch drum characterized in that the end of the wire rope and the external member are joined by brazing.

2. 2. The winch drum according to claim 1, wherein the outer member is sized to pass through the small opening.

3. 3. The winch drum according to claim 1, wherein the contact surfaces are paired with each other by a concave surface and a convex surface that are uneven in the width direction of the mounting hole in a cross-sectional view of the wedge-shaped member.

4. The winch drum according to claim 1 or 2, characterized in that when the inner member is integrally installed in the mounting hole with the outer member, the front end portion in the insertion direction into the mounting hole is aligned with the edge portion of the large opening.

Images