JP2020152499A - Backstop of front strut - Google Patents

Abstract

To provide a backstop of a front strut capable of reliably restricting a rotation range of the front strut.SOLUTION: A backstop of a front strut includes: a backstop body 2 with a connection part disposed at one end thereof in a longitudinal direction; a link 3 connecting a boom head 14a of a boom 14 and the other end of the backstop body 2 in the longitudinal direction; and a slide part 4 that is disposed on a front strut 19 and which the connection part of the backstop body 2 is slidably attached to. When the front strut 19 is made to stand at a predetermined angle or more with respect to the boom 14, the connection part of the backstop body 2 is connected with the end of the slide part 4. The backstop body 2 restricts a rotation range of the front strut 19 in a state in which the connection part is connected with the end of the slide part 4.SELECTED DRAWING: Figure 2

Description

The present invention relates to a front strut backstop that limits the range of rotation of the crane front struts.

In a crane in which the jib is undulatingly attached to the tip of the boom, the jib may be attached to the tip of the boom and struts (front struts and rear struts) capable of undulating the jib may be attached. In this strut installation work, it is necessary to repeatedly raise and lower the struts by turning the rope and attaching the backstop, and there is a risk of interference with struts, booms and jib, and interference between struts. There was, careful work was required, and workability was not sufficient.
In addition, a rope for undulating the jib is hung between the front strut and the rear strut, but when this is wound up by the jib undulation winch, the front strut is pulled toward the rear strut and the rear strut There was a risk of falling to the side, and more careful work was required for this work as well.

Here, Patent Document 1 discloses a crane provided with a backstop on the front strut.

Japanese Unexamined Patent Publication No. 2014-43317

By the way, the backstop limits the rotation range of the undulating member by contacting the backstop receiver when the undulating member such as a boom or a jib tries to rotate beyond a predetermined range. However, with a short backstop as in the prior art, the distance between the front (front) strut and the part that fixes the backstop (the rear (rear) strut in the prior art) is extremely short, so the front strut And the rear struts may interfere. In addition, when the undulating member or strut rolls, or when the undulating member or strut bends due to its long length, a gap occurs between the backstop and the backstop receiver, and the backstop hits the backstop receiver. Since there is a risk that they will not come into contact with each other, it may not be possible to limit the rotation of the front strut.

An object of the present invention is to provide a front strut backstop capable of reliably limiting the rotation range of the front strut.

The present invention is a backstop of a front strut in a crane in which a front strut is undulatingly attached to the tip of a boom, a backstop main body having a connecting portion at one end in the longitudinal direction, and a tip of the boom. The front has a link connecting the back stop body and the other end in the longitudinal direction, and a slide portion provided on the front strut and to which the connection portion of the back stop body is slidably attached. When the strut is raised by a predetermined angle or more with respect to the boom, the connection portion of the backstop body comes into contact with the end portion of the slide portion, and the connection portion of the backstop body is the end of the slide portion. It is characterized in that the rotation range of the front strut is limited in a state of being in contact with the portion.

According to the present invention, when the front strut is raised by a predetermined angle or more with respect to the boom, the connection portion of the backstop main body comes into contact with the end portion of the slide portion. This makes it possible to limit the rotation range of the front strut with the backstop body. Then, the tip of the boom and the other end in the longitudinal direction of the backstop body are connected by a link, and the connection portion provided at one end in the longitudinal direction of the backstop body is connected to the slide portion provided on the front strut. It is a configuration. Therefore, even when the front strut rolls, lateral displacement between the boom and the backstop body or between the front strut and the backstop body is unlikely to occur. Therefore, the rotation range of the front strut can be reliably limited by the backstop body.

It is a side view of a rafting crane. It is an enlarged view of the main part A of FIG. It is an enlarged view of the main part C of FIG. It is an enlarged view of the main part D of FIG. FIG. 4 is a view seen from the E direction. It is a side view of the tip part of a boom in a strut assembly operation. It is a side view of the tip part of the boom in the strut assembly operation, and is the figure which shows the operation following FIG. It is a side view of the tip part of the boom in the strut assembly operation, and is the figure which shows the operation which follows FIG. It is a side view of the tip part of the boom in the strut assembly operation, and is the figure which shows the operation following FIG. It is a side view of the tip part of the boom in the strut assembly operation, and is the figure which shows the operation following FIG. It is a side view of the tip part of the boom in the strut assembly operation, and is the figure which shows the operation following FIG. It is a side view of the tip part of the boom in the strut assembly operation, and is the figure which shows the operation which follows FIG. It is a side view of the tip part of the boom in the strut assembly operation, and is the figure which shows the operation following FIG. It is a side view of the tip part of the boom in the strut assembly operation, and is the figure which shows the operation following FIG. It is a side view of the tip portion of the boom in the strut assembly operation, and is the figure which shows the operation following FIG. It is a side view of the tip part of a boom in a jib assembly operation. It is a side view of the tip part of the boom in the jib assembly operation, and is the figure which shows the operation following FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(Structure of roughing crane)
The backstop (backstop) 1 of the front strut of the present embodiment is provided on a roughing crane which is a working machine. As shown in FIG. 1, which is a side view of the ruffing crane 10, the ruffing crane 10 has a configuration in which an upper swinging body 12 is rotatably mounted on a crawler-type lower traveling body 11. The roughing crane 10 may be a mobile crane using a moving means (for example, a wheel) other than a crawler, or a fixed crane having no moving means. Further, the application target of the present invention is not limited to the roughing crane, and for example, the present invention can be applied to a tower crane.

The rafting crane 10 is an upper swinging body 12 corresponding to a crane main body, a lower traveling body 11 that rotatably supports the upper swinging body 12, an undulating member including a boom 14 and a jib 15, and a boom undulating member. It includes a mast 16. Further, a counterweight 17 for adjusting the balance of the ruffing crane 10 is loaded on the rear portion of the upper swing body 12. A cab 13 is provided at the front end of the upper swing body 12. The cab 13 corresponds to the driver's seat of the ruffing crane 10.

The boom 14 is a so-called lattice type, and is composed of a lower boom 14A, one or more intermediate booms 14B (two in the example), and an upper boom 14C. Specifically, the lower boom 14A is connected to the front portion of the upper swing body 12 so as to be rotatable in the undulating direction. The intermediate boom 14B is detachably added to the tip end side of the lower boom 14A. The upper boom 14C is detachably added to the tip side of the intermediate boom 14B. A rear strut 18 and a front strut 19 for rotating the jib 15 are rotatably connected to the tip of the upper boom 14C as described later. The boom 14 is rotatably supported by the upper swing body 12 with the boom foot pin 14s provided at the lower end as a fulcrum.

However, the specific structure of the boom is not limited in the present invention. For example, the boom may have no intermediate boom, or may have a different number of intermediate booms from the above. Further, the boom may be composed of a single member.

The jib 15 is also a so-called lattice type, and is composed of a lower jib 15A, one or more (one in the example) intermediate jib 15B, and an upper jib 15C. Specifically, the lower jib 15A is connected to the tip of the upper boom 14C so as to be rotatable in the undulating direction. The intermediate jib 15B is detachably added to the tip end side of the lower jib 15A. The upper jib 15C is detachably added to the tip end side of the intermediate jib 15B. The rotation center axis of the jib 15 is a horizontal axis parallel to the rotation center axis (boom foot pin 14s) of the boom 14 with respect to the upper swing body 12.

The mast 16 has a base end and a rotating end, and the base end is rotatably connected to the upper swivel body 12. The rotation shaft of the mast 16 is parallel to the rotation shaft of the boom 14 and is located immediately behind the rotation shaft of the boom 14. That is, the mast 16 can rotate in the same direction as the undulating direction of the boom 14. On the other hand, the rotating end of the mast 16 is connected to the tip of the boom 14 via a pair of left and right boom guy lines 20. This connection links the rotation of the mast 16 with the rotation of the boom 14.

A pair of left and right backstops 21 are provided on the upper swing body 12. These backstops 21 come into contact with the left and right sides of the lower boom 14A of the boom 14 when the boom 14 reaches the standing posture shown in FIG. By this contact, it is regulated that the boom 14 is fanned backward by a strong wind or the like.

The rear strut 18 and the front strut 19 are rotatably pivotally supported at the tip of the boom 14. The rear strut 18 is held in a posture of projecting from the tip of the upper boom 14C to the boom standing side (left side in FIG. 1). As a means for maintaining this posture, a pair of left and right backstops 22 and a pair of left and right guy links 23 are interposed between the rear struts 18 and the boom 14. The backstop 22 is interposed between the upper boom 14C and the intermediate portion of the rear strut 18, and supports the rear strut 18 from below. The guy link 23 is stretched so as to connect the tip end portion of the rear strut 18 and the lower boom 14A of the boom 14, and the position of the rear strut 18 is regulated by the tension thereof. The rear struts 18 and the front struts 19 may be rotatably supported by the base end portion of the jib 15. Further, the rear strut 18 may be rotatably pivotally supported at the tip end portion of the boom 14, and the front strut 19 may be rotatably pivotally supported at the base end portion of the jib 15.

The front strut 19 is connected to the jib 15 so as to rotate (integrally) with the jib 15. Specifically, a pair of left and right jib guy lines 24 are stretched so as to connect the tip of the front strut 19 and the tip of the jib 15. Therefore, the jib 15 is also rotationally driven by the rotational drive of the front strut 19. The rear strut 18 described above is arranged on the rear side of the front strut 19 as shown in FIG. 1, and forms a substantially isosceles triangular shape with the front strut 19.

Various winches are mounted on the rafting crane 10. Specifically, a boom undulating winch 25 for undulating the boom 14, a jib undulating winch 26 for rotating the jib 15 in the undulating direction, and a main winding for hoisting and lowering the suspended load. A winch 27 for use and a winch 28 for auxiliary winding are mounted. In the rafting crane 10 according to the present embodiment, the boom undulating winch 25 is installed near the base end of the mast 16. Further, the jib undulating winch 26, the main winding winch 27, and the auxiliary winding winch 28 are all installed on the lower boom 14A of the boom 14. These winches 25, 26, 27, 28 may be mounted on the upper swing body 12.

The boom undulating winch 25 winds up and unwinds the boom undulating rope 29. Then, the boom undulating rope 29 is arranged so that the mast 16 rotates by this winding and unwinding. Specifically, sheave blocks 30 and 31 in which a plurality of sheaves are arranged in the width direction are provided at the rotating end of the mast 16 and the rear end of the upper rotating body 12, respectively, from the boom undulating winch 25. The pulled-out boom undulating rope 29 is hung between the sheave blocks 30 and 31. Therefore, when the boom undulating winch 25 winds up and extends the boom undulating rope 29, the distance between the two sheave blocks 30 and 31 changes, whereby the mast 16 and the boom 14 interlocking with the mast 16 change. It rotates in the undulating direction.

The jib undulating winch 26 winds up and unwinds the jib undulating rope 32 wound between the rear strut 18 and the front strut 19. Then, the jib undulating rope 32 is arranged so that the front strut 19 rotates by this winding and unwinding. Specifically, the upper boom 14C of the boom 14 is provided with a guide sheave 33, and a plurality of sheaves are arranged in the width direction at the rotating end of the rear strut 18 and the rotating end of the front strut 19. Sheave blocks 34 and 35 are provided. Then, the jib undulating rope 32 pulled out from the jib undulating winch 26 is hung on the guide sheave 33 and is hung between the sheave blocks 34 and 35. Therefore, the winding and unwinding of the jib undulating rope 32 by the jib undulating winch 26 changes the distance between the two sheave blocks 34 and 35, and rotates the front strut 19 and the jib 15 linked thereto in the undulating direction. Let me.

The main winding winch 27 winds up and lowers the suspended load by the main winding rope 36. Regarding this main winding, guide sheaves 37, 38, and 39 for main winding are rotatably provided at a portion near the base end of the rear strut 18, a portion near the base end of the front strut 19, and a tip portion of the jib 15, respectively. Further, a main winding sheave block in which a plurality of main winding point sheaves 40 are arranged in the width direction is provided at a position adjacent to the main winding guide sheave 39. The main winding rope 36 pulled out from the main winding winch 27 is hung on the main winding guide sheaves 37, 38, 39 in order, and is attached to the main winding point sheave 40 of the sheave block and the main hook 41 for hanging. It is hung between the sheave 42 of the provided sheave block. Therefore, when the main winding winch 27 winds up or unwinds the main winding rope 36, the distance between the sheaves 40 and 42 changes, and the main winding rope 36 connected to the main winding rope 36 hanging from the tip of the jib 15 changes. The hook 41 is wound and unwound.

Similarly, the auxiliary winding winch 28 winds up and lowers the suspended load by the auxiliary winding rope 43. Regarding this auxiliary winding, the auxiliary winding guide sheaves 44, 45, 46 are rotatably provided coaxially with the main winding guide sheaves 37, 38, 39, respectively, and the auxiliary winding is provided at a position adjacent to the auxiliary winding guide sheave 46. The point sheave 47 is provided so as to be rotatable. The auxiliary winding rope 43 pulled out from the auxiliary winding winch 28 is hung on the auxiliary winding guide sheaves 44, 45, 46 in order, and is hung from the auxiliary winding point sheave 47. Therefore, when the auxiliary winding winch 28 winds up or unwinds the auxiliary winding rope 43, the auxiliary winding hook 48 for suspension connected to the end of the auxiliary winding rope 43 is wound or unwound.

(Backstop configuration)
As shown in FIG. 2, which is an enlarged view of the main part A of FIG. 1, the backstop 1 has a backstop main body 2, a link 3, and a slide part 4. In FIG. 2, the front struts 19 are shown at three different angles, B1 to B3. Further, in FIG. 2, a state in which the boom 14 is laid down is shown.

As shown in FIG. 3, which is an enlarged view of the main part C of FIG. 2, a pin (connecting portion) 2b is provided at one end in the longitudinal direction of the backstop main body 2. The backstop main body 2 has a known configuration in which an inner cylinder is slidably fitted inside the outer cylinder and a coil spring for cushioning is attached to the outer circumference of one end of the inner cylinder. In this embodiment, a pin 2b is provided at one end of the outer cylinder of the backstop main body 2 in the longitudinal direction.

As shown in FIG. 2, the link 3 connects the boom head (tip portion) 14a of the boom 14 and the other end of the backstop main body 2 in the longitudinal direction. One end in the longitudinal direction of the link 3 is connected to the other end in the longitudinal direction of the backstop body 2 with a pin. The other end of the link 3 in the longitudinal direction is connected to the boom head (tip) 14a with a pin. In this embodiment, the inner cylinder of the backstop main body 2 and the link 3 are connected.

The slide portion 4 is provided on the front strut 19. Specifically, the slide portion 4 is provided on the surface of the front strut 19 on the rear strut 18 side. As shown in FIG. 3, the pin 2b of the backstop main body 2 is slidably attached to the slide portion 4. Specifically, the slide portion 4 is formed with a long hole (guide portion) 4a through which the pin 2b of the backstop main body 2 can slide inside. The connection portion provided at one end of the backstop main body 2 in the longitudinal direction and slidably attached to the slide portion 4 is not limited to the pin 2b.

When the front strut 19 is raised by a predetermined angle or more with respect to the boom 14, the pin 2b of the backstop body 2 comes into contact with the end of the slide portion 4, that is, the edge of the elongated hole 4a. Specifically, as shown in FIG. 2, when the front strut 19 is raised from the B1 state (downturned state) to the B2 state, the pin 2b of the backstop main body 2 is attached to the edge of the elongated hole 4a. Abut.

As shown in FIG. 2, when the front strut 19 is further raised from the state of B2, the coil spring of the backstop main body 2 is compressed. Then, when the front strut 19 is in the B3 state, a limit switch (not shown) provided on the backstop main body 2 is turned on. As a result, further rotation of the front strut 19 is restricted.

In this way, when the front strut 19 is raised by a predetermined angle or more with respect to the boom 14, the pin 2b of the backstop main body 2 comes into contact with the edge of the elongated hole 4a. As a result, the rotation range of the front strut 19 can be limited by the backstop main body 2. Then, the boom head 14a of the boom 14 and the other end in the longitudinal direction of the back stop main body 2 are connected by a link 3, and a pin 2b provided at one end in the longitudinal direction of the back stop main body 2 is provided on the front strut 19. It is configured to be connected to the slide portion 4. Therefore, even when the front strut 19 rolls, lateral displacement between the boom 14 and the backstop main body 2 or between the front strut 19 and the backstop main body 2 is unlikely to occur. Therefore, the rotation range of the front strut 19 can be reliably limited by the backstop main body 2.

As shown in FIG. 4 which is an enlarged view of the main part D of FIG. 3 and FIG. 5 which is a view of FIG. 4 viewed from the E direction, the rib 2a provided at one end in the longitudinal direction of the backstop main body 2 Pins 2b are continuously inserted through the holes and the elongated holes 4a of the slide portion 4. The pin 2b slides in the elongated hole 4a of the slide portion 4. The guide portion through which the pin 2b can slide inside is not limited to the elongated hole 4a, and may be a groove or a rail.

(Strut assembly operation)
Next, the strut assembly operation will be described with reference to FIGS. 6 to 15. 6 to 15 are side views of the tip end portion of the boom 14. The boom 14 is in a prone state.

First, as shown in FIG. 6, the front strut 19 and the rear strut 18 are carried in by an auxiliary crane in a state where the rear strut 18 is placed on the front strut 19 and integrated. Next, as shown in FIG. 7, the base end portion of the front strut 19 is connected to the boom head 14a with a pin. Then, the rear strut 18 is separated from the front strut 19.

Next, as shown in FIG. 8, the base end portion of the rear strut 18 is connected to the boom head 14a with a pin. At this time, the rear strut 18 is supported from below by the support member 51 provided on the front strut 19. Next, as shown in FIG. 9, the other end of the link 3 in the longitudinal direction is connected to the boom head 14a with a pin while suspending the backstop main body 2 with an auxiliary crane. Further, one end of the strut-side jib guy line 24a, which is a part of the jib guy line 24, is connected to the front strut 19.

Next, as shown in FIG. 10, while feeding out the jib undulating rope 32 hung between the rear struts 18 and the front struts 19, the tip of the rear struts 18 is moved by an auxiliary crane using a dedicated sling 52. I will lift it. Then, as shown in FIG. 11, the rear strut 18 is caused by setting the distance between the rear strut 18 and the front strut 19 to a predetermined length.

Next, as shown in FIG. 12, the hoisting rope 53 and the raising wire 54 are connected with the distance between the rear strut 18 and the front strut 19 maintained at a predetermined length. Then, as shown in FIG. 13, with the distance between the rear strut 18 and the front strut 19 maintained at a predetermined length, the hoisting rope 53 is wound up to raise the rear strut 18, and the backstop 22 of the rear strut 18 The end is pinned to the boom head 14a.

Next, as shown in FIG. 14, the hoisting rope 53 is wound up to further raise the rear strut 18 while maintaining the distance between the rear strut 18 and the front strut 19 at a predetermined length. Then, the strut-side guy link 23a, which is a part of the guy link 23 and one end of which is connected to the rear strut 18, is connected to the guy link 23. At this time, the backstop 22 of the rear strut 18 is in the most contracted state. On the other hand, the back stop 1 of the front strut 19 limits the rotation of the front strut 19 when the limit switch is turned on. Next, as shown in FIG. 15, the hoisting rope 53 and the raising wire 54 are removed, and the dedicated sling 52 is stored in the rear strut 18. Then, the rear strut 18 is caused by defeating the front strut 19 while paying out the jib undulating rope 32.

(Jib assembly operation)
Next, the jib assembly operation will be described with reference to FIGS. 16 and 17. 16 and 17 are side views of the tip end portion of the boom 14. The boom 14 is in a prone state.

First, as shown in FIG. 16, by winding up the jib undulating rope 32, the front strut 19 is raised at a predetermined angle or more with respect to the boom 14. The pin 2b of the backstop body 2 comes into contact with the edge of the elongated hole 4a of the slide portion 4. Further, by raising the front strut 19, the limit switch provided on the back stop main body 2 is turned on. This limits further rotation of the front struts 19. In this state, the lower jib 15A alone is suspended by the auxiliary crane, and the base end portion of the lower jib 15A is moved to the tip end portion of the boom 14. Since the front strut 19 is sufficiently raised with respect to the boom 14, there is no possibility that the hook of the auxiliary crane interferes with the front strut 19.

Next, as shown in FIG. 17, the jib 15 is assembled by connecting the intermediate jib 15B and the upper jib to the lower jib 15A. After that, the backstop 55 of the jib 15 is connected to the boom head 14a with a pin. Then, the jib undulating rope 32 is paid out. Then, the strut-side jib guy line 24a, which is a part of the jib guy line 24 and has one end connected to the front strut 19, is connected to the jib guy line 24.

(effect)
As described above, according to the backstop 1 according to the present embodiment, when the front strut 19 is raised by a predetermined angle or more with respect to the boom 14, the pin 2b of the backstop main body 2 is attached to the edge of the elongated hole 4a. Contact. As a result, the rotation range of the front strut 19 can be limited by the backstop main body 2. Then, the boom head 14a of the boom 14 and the other end in the longitudinal direction of the back stop main body 2 are connected by a link 3, and a pin 2b provided at one end in the longitudinal direction of the back stop main body 2 is provided on the front strut 19. It is configured to be connected to the slide portion 4. Therefore, even when the front strut 19 rolls, lateral displacement between the boom 14 and the backstop main body 2 or between the front strut 19 and the backstop main body 2 is unlikely to occur. Therefore, the rotation range of the front strut 19 can be reliably limited by the backstop main body 2.

(Modification example)
In addition, in FIG. 4 and FIG. 5, the pin 2b may be rotatable. The pin 2b moves while rotating in the elongated hole 4a of the slide portion 4. As a result, one end of the backstop body 2 in the longitudinal direction can be suitably slid on the slide portion 4.

Although the embodiments of the present invention have been described above, only specific examples are illustrated, and the present invention is not particularly limited, and the specific configuration and the like can be appropriately redesigned. In addition, the actions and effects described in the embodiments of the present invention merely list the most preferable actions and effects resulting from the present invention, and the actions and effects according to the present invention are described in the embodiments of the present invention. It is not limited to what has been done.

1 Backstop 2 Backstop body 2b pin (connection part)
3 Link 4 Slide part 4a Long hole (guide part)
10 Roughing Crane 11 Lower Rope 12 Upper Swing 13 Cab 14 Boom 14a Boom Head 14A Lower Boom 14B Intermediate Boom 14C Upper Boom 15 Jib 15A Lower Jib 15B Intermediate Jib 15C Upper Jib 16 Mast 17 Counterweight 18 Rear Strut 19 Boom Guy Line 21 Backstop 22 Backstop 23 Guy Link 23a Strut Side Guy Link 24 Jib Guy Line 24a Strut Side Jib Guy Line 25 Boom Unraveling Winch 26 Jib Unraveling Winch 27 Main Winding Winch 28 Supplementary Winding Winch 29 Boom Unraveling Rope 30 31 Sheave block 32 Jib undulating rope 33 Guide sheave 34,35 Sheave block 36 Main winding rope 37,38,39 Main winding guide sheave 40 Main winding point sheave 41 Main hook 42 Sheave 43 Supplementary winding rope 44,45,46 Supplementary winding guide sheave 47 Supplementary winding point sheave 48 Supplementary hook 49 Sheave 51 Support member 52 Dedicated sling 53 Winding rope 54 Wire 55 Backstop

Claims (2)

A backstop for front struts in a crane with undulating front struts attached to the tip of the boom.
A backstop body with a connection at one end in the longitudinal direction,
A link connecting the tip of the boom and the other end of the backstop body in the longitudinal direction,
A slide portion provided on the front strut and to which the connection portion of the backstop body is slidably attached.
Have,
When the front strut is raised by a predetermined angle or more with respect to the boom, the connection portion of the backstop body comes into contact with the end portion of the slide portion.
The backstop main body is a backstop of a front strut, which limits the rotation range of the front strut in a state where the connection portion is in contact with an end portion of the slide portion. The connection is rotatable
The back stop of the front strut according to claim 1, wherein the slide portion includes a guide portion that guides the movement of the connection portion.

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