JPH0577184U - Wire rope terminal attachment device for crane with over-winding detection device - Google Patents

Abstract

(57) [Summary] [Object] The present invention wraps a wire rope fed from a winch between a top sheave of a boom tip and a hook sheave of a hook block, and uses an overwinding detection switch provided on the boom to wire a wire. In a crane with an overwinding detection device that detects an excessive rise of the hook block due to overwinding of the rope, install the wire rope terminal compactly inside the support frame at the tip of the boom, collide with other objects, and be exposed to wind and rain. Install so that there is no [Structure] A top sheave 4, an overwinding detection switch 13, and a rope terminal attachment means S are provided in the lower part of a support frame 2 fixed to the tip of a boom B.
A lower guide member 20 for guiding the wire rope 5 from above along the top sheave 4, an upper guide member 21 provided thereon for deflecting and guiding the wire rope 5 in a direction substantially parallel to the boom B, and a wire rope. The terminal 5 includes a wire socket 22 that is attached to the tip of the boom B by bypassing the overwinding detection switch 13.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an attachment device for a boom of a terminal of a wire rope suspended between a top sheave of a boom tip and a hook block in a crane equipped with an overwinding detection device.

[0002]

[Prior Art]

 Conventionally, in the above-mentioned crane, it is known to prevent damage and damage to parts such as an overwinding detection switch and a wire socket when the overwinding detection device operates (see Japanese Utility Model Publication No. 3-44789).

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional device, the rope guide, the overwinding detection switch, the wire socket, etc. are attached to the outer surface of the side plate fixed to the boom top in an exposed state. In addition to the inconvenience that they may collide with other objects and cause damage or damage, they also widen the width of the boom tip and deteriorate the operability of the boom in narrow spaces. There are challenges.

The present invention has been made in view of the above situation, and compactly installs an overwinding detection switch and a rope end attaching means for attaching an end of a wire rope to a boom in a support frame fixed to a boom tip. It is an object of the present invention to provide a wire rope terminal attachment device for a new crane with an overwinding detection device, which can solve the above problems.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the first feature of the present invention is that a wire rope extended from a winch between a top sheave pivotally supported on the tip of a boom and a hook sheave pivotally supported on a hook block. In the crane with an overwinding detection device, the overwinding detection switch provided at the tip of the boom is used to detect an excessive rise of the hook block due to overwinding of the wire rope. A support frame is fixed, and a rope terminal attachment means is provided in the lower part of the support frame for attaching the top sheave, overwinding detection switch, and the end of the wire rope to the tip of the boom. The means is a lower guide portion for guiding the wire rope from the hook sheave upward along the wire guide surface of the top sheave. An upper guide member which is provided above the lower guide member and which guides and guides the wire rope guided thereto in a direction substantially parallel to the boom; and an upper guide member which is disposed at substantially the same level as the upper guide member. It consists of a wire socket that connects the end of the wire rope to the tip of the boom, bypassing the overwinding detection switch.

A second feature of the present invention is that the front end surface of the supporting frame fixed to the tip of the boom is formed into a curved surface.

[0007]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a side view of a crane equipped with the device of the present invention, FIG. 2 is a partially cutaway front end view taken along the line 2 of FIG. 3, and FIG. 3 is a view taken along line 3-3 of FIG. FIG. 4 is a side view of the part broken, FIG. 4 is the same side view as FIG. 3 when the hook block is overwound, and FIG. 5 is an enlarged cross-sectional view taken along line 5-5 of FIG.

In FIG. 1, a boom B, which is supported by a revolving frame F so as to be lifted up and down, has a multistage structure, and a support frame 2 is fixed to the tip of a tip boom 1 thereof. The support frame 2 extends below the tip boom 1, and the front end face 2 ₁ thereof is formed into a forward curved convex curved surface. A sheave pin 3 is laid horizontally on the lower portion of the support frame 2, and a pair of top sheaves 4 are rotatably supported on the sheave pin 3.

A hook block 6 suspended from the tip boom 1 via a wire rope 5 has a hook 8 suspended from the lower end of a hook frame 7 and a pair of hook sheaves 10 rotatably laid horizontally via a sheave pin 9. It is constructed by hanging.

The wire rope 5 unreeled from the winch W provided on the revolving frame F is normally extended forward along the boom B and hangs over the pair of the top sheave 4 and the hook sheave 10. It is rotated and its terminal is bound to the wire socket 22 described later (see FIG. 5). Since the wire rope 5 is suspended between the top sheave 4 and the hook sheave 10 by a conventionally known means, a detailed description thereof will be omitted.

The support frame 2 is provided with a detection device D for detecting an excessive rise of the hook block 6 due to excessive winding of the wire rope 5. Next, the device D will be explained. An overwinding detection switch 13 is attached to the inner surface of one side wall of the boom 1 of the support frame 2, and a detection wire 15 is connected to its operating arm 14. A weight 16 which is vertically guided by the wire rope 5 is connected to the lower end. A weight receiver 17 is fixed to the upper surface of the one-way hook block 6 so as to face the weight 16. If the hook block 6 rises excessively due to excessive winding of the wire rope 5, the weight receiver 17 collides with the weight 16. Then, the detection wire 15 is loosened, the overwinding detection switch 13 is turned on to detect this, and an alarm is issued.

The lower portion of the support frame 2 is formed in a channel shape with the front and back opened, and the free end portion of the wire rope 5 extending upward from the hook sheave 10 is provided in the lower portion of the support frame 2. Rope terminal mounting means S for mounting in the support frame 2 is provided.

Next, the structure of the rope terminal attaching means S will be described with reference to FIGS. 3 to 5, which is composed of a lower guide member 20, an upper guide member 21, and a wire socket 22. The lower guide member 20 is formed in an arc shape and fixed to the inner surface of the lower side of the support frame 2 at one side, and the arc guide surface 20 ₁ is concentric with the rotation center of the top sheave 4 and the top sheave 4 It is formed with the same curvature as the guide surface of the wire rope 4. A guide plate 20 ₂ is fixedly installed on the inner surface of the lower guide member 20, and the wire rope 5 is held between the guide plate 20 ₂ and the inner surface of the support frame 2 to prevent lateral displacement thereof.

The upper guide member 21 is fixed to a front portion of a support plate 23 that is horizontally fixed to the support frame 2 in a substantially horizontal position above the top sheave 4. The upper guide member 21 is formed by bending a pipe member in a semicircular shape so as to guide the wire rope 5 guided by the lower guide member 20, and a half portion of the lower guide member 20. is downwardly inclined toward the guide surface 20 ₁ or other halves extend substantially horizontally on the support plate 23. Then, the wire rope 5 from the lower guide member 20 is inserted into the upper guide member 21 and guided in a substantially horizontal direction.

As shown in FIG. 5, on the support plate 23, the wire socket 22 is fixed to the side of the overwinding detection switch 13 and is opposed to the upper guide member 21. .. This wire socket 22 has a socket main body 22 ₁ having an inclined surface narrowing toward the upper guide member 21 in order to bind a free end of the wire rope 5 guided substantially horizontally by the upper guide member 21, and a floating inside thereof. A free end of the wire rope 5, which is composed of a wedge piece 22 ₂ that can be accommodated and is bound in a loop by a wire clip 24, is sandwiched between the socket body 22 ₁ and the wedge piece 22 ₂ and the wire socket 22 _2. Is detachably attached.

A cord reel 27 for winding an electric cord 25 for supplying electric power to electric equipment such as the overwinding detection switch 13 is rotatably mounted on the upper portion of the support frame 2 via a stay 26. Is pivotally supported.

Reference numeral 28 in the figure denotes a support roller for supporting the wire rope 5.

The operation of this embodiment will be described next. As shown in FIGS. 1 to 3, when the hook block 6 is normally supported by the boom B via the wire rope 5, the wire rope 5 is overwound. As shown in FIG. 4, when the hook block 6 rises excessively and the weight receiver 17 collides with the weight 16, the detection wire 15 is loosened, the overwinding detection switch 13 is turned on, and an alarm device (not shown) is activated. Although an alarm is issued, the end of the wire rope 5 is guided by the lower guide member 20 and the upper guide member 21 to bypass the overwinding detection switch 13, so that the overwinding detection switch 13, the wire clip 24, etc. are supported. There is no risk of being caught between the lower surface of the frame 2 and the upper surface of the hook block 6, and they will not be damaged or damaged. The lower guide member 20, the upper guide member 21, and the wire socket 22, which constitute the rope end attachment means S of the wire rope 5 to the support frame 2, are all attached to the lower part of the support frame 2 in a compact manner, and Since the width of the tip of the boom B does not expand, they do not collide with or interfere with other objects, and the supporting frame 2 has a device such as a cord reel 17 therein. It is possible to secure a relatively large space that can be stored.

In the above embodiment, the case where the present invention is applied to the tip boom of the multi-stage boom has been described, but it goes without saying that this may be applied to a single boom.

[0021]

[Effect of the device]

 As described above, according to the first feature of the present invention, in the crane with the overwinding detection device, the supporting frame is fixed to the tip of the boom, and the top sheave and overwinding detection are performed below the boom in the supporting frame. Rope end attachment means is provided for attaching the switch and wire rope end to the tip of the boom, and the rope end attachment means is provided for moving the wire rope from the hook sheave upward along the wire guide surface of the top sheave. And a lower guide member for guiding the wire rope, and an upper guide member provided above the lower guide member for diverting and guiding the proposed wire rope in a direction substantially parallel to the boom. Since the wire rope terminals are arranged at the same level and are connected to the tip of the boom by circumventing the overwind detection switch, the wire rope ends are configured. The rope attachment means is compactly installed below the boom in the support frame, protected by the support frame and prevented from being exposed to the weather and interference with other objects, and the rope attachment means is always smooth and safe. The operation can be guaranteed and the service life can be extended. Moreover, since the width of the boom tip portion is not widened by the rope attachment means, the operability of the boom in a narrow space is improved.

Further, a storage space for devices such as cord reels can be secured above the support frame at the tip of the boom.

According to the second aspect of the present invention, since the front end surface of the support frame is formed into a curved surface, it is possible to prevent interference with other objects and improve appearance. be able to.

[Brief description of drawings]

1 is a side view of a crane equipped with the device of the present invention.

FIG. 2 is a partially cutaway front end view taken along the line 2 of FIG.

3 is a partially cutaway side view taken along line 3-3 of FIG.

FIG. 4 is the same side view as FIG. 3 when the hook block is overwound.

5 is a cross-sectional view taken along line 5-5 of FIG.

[Explanation of symbols]

 2 Support frame 4 Top sheave 5 Wire rope 6 Hook block 10 Hook sheave 13 Overwinding detection switch 20 Lower guide member 21 Upper guide member 22 Wire socket B Boom S Rope end attachment means W winch

Claims (2)

[Scope of utility model registration request] 1. A wire fed from a winch (W) between a top sheave (4) pivotally supported by the tip of a boom (B) and a hook sheave (10) pivotally supported by a hook block (6). The rope (5) is suspended, and an overwinding detection switch (13) provided at the tip of the boom (B) is used to detect an excessive rise of the hook block (6) due to overwinding of the wire rope (5). In the crane with the overwinding detection device, the support frame (2) is fixed to the tip end portion of the boom (B), and the top sheave (4) and the overwinding detection switch (13) are provided in the lower portion of the support frame (2). ) And the end of the wire rope (5) at the tip of the boom (B), rope end attachment means (S) is provided, and the rope end attachment means (S) is provided on the hook sheave (1).
A lower guide member (20) for guiding the wire rope (5) from (0) upward along the wire guide surface of the top sheave (4), and provided above the lower guide member (20). Wire rope guided by it (5)
An upper guide member (21) that guides the vehicle in a direction substantially parallel to the boom (B) and is disposed at substantially the same level as the upper guide member (21), and the end of the wire rope (5) is overwound. A wire rope terminal attachment device for a crane with an overwinding detection device, characterized in that it comprises a wire socket (22) that bypasses the detection switch (13) and is bound to the tip of the boom (B). 2. The overwinding detection according to claim 1, wherein a front end surface (2 ₁ ) of the support frame (2) fixed to the tip end portion of the boom (B) is formed into a curved surface. Wire rope terminal attachment device for crane with equipment.