JPH0735483U - Rope guide device for crane boom - Google Patents

Abstract

(57) [Summary] [Purpose] Protect the rope guide roller bearings that support the rope at the rear of the boom from the rope. [Structure] A roller support member 34 is erected on the boom main column 22, and a rope guide roller 24 is mounted on the roller support member 34 via a bearing 36.
Rotatably support the end of the. Further, guards 40 are provided in front of and behind the roller support member 34, and by the guards 40, the rope 18 can be supported from the outer side and the upper side.
Prevent contact with 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rope guide device provided on a lattice boom of a crane or the like.

[0002]

[Prior art]

 FIG. 5 shows an example of a conventional general crane (a mobile crane in the illustrated example). The illustrated crane includes a lower traveling body equipped with traveling means such as a crawler 10 and an upper revolving structure 12 installed on the lower traveling structure. Then, the lattice crane boom) 14 is attached. As shown in FIG. 6, the crane boom 14 has a plurality of boom main columns 22 extending in the boom longitudinal direction (vertical direction in FIG. 6) and a boom lattice member 21 connecting the boom main columns 22 to each other. There is.

A boom hoisting winch 15 and a suspending winch 17 are mounted on the upper swing body 12, and a rope 16 unwound from the boom hoisting winch 15 is connected to the tip end of the crane boom 14 to suspend the winch. A rope 18 fed out from 17 is hung on a sheave (not shown) at the tip of the crane boom and connected to a hanging hook (not shown). The crane boom 14 is undulated by winding and unwinding the rope 16, while the hanging hook is moved up and down by winding and unwinding the rope 18.

Here, the rope 18 is stretched along the rear surface of the crane boom 14. Therefore, if the rope 18 is left unattended, the rope 18 and the crane boom 14 may come into contact with each other, which may lead to peeling off of the crane boom coating or damage to the crane boom. Therefore, in order to prevent the contact and smooth the movement of the rope 18, a rope guide device 20 as shown in FIGS. 7 and 8 is provided on the rear surface of the crane boom 14.

In FIGS. 7 and 8, a pair of front and rear brackets 26 are fixed to two specific boom main columns 22 by U bolts 28 and nuts 30, and roller support members 34 are mounted on these brackets 26. Are fixed by bolts 32 or the like. Both roller support members 34 stand upright from the rear surface of the crane boom 14 and rotatably support both ends of the rope guide roller 24 via bearings 36 on the upper part thereof. The rope guide roller 24 extends in the width direction of the crane boom and supports the rope 18 from the lower side, that is, the side closer to the rear surface of the crane boom, thereby preventing contact between the rope 18 and the crane boom 14.

By the way, in such a rope guide device 20, there is a case where the rope 18 sags and falls off the outside of the roller support member 34 due to a change in operating state (two-dot chain line in FIG. 7). In this case, if no protection is provided on the outer side of the roller support member 34, when the rope 18 is re-tensioned after the drop, the rope 18 will be replaced by a bearing, a bolt, or a roller as shown in FIG. 9 (a). There is a risk that the protrusion such as an end may be caught and may not be able to return, or the bearing 36 and the like at the upper portion of the roller support member 34 may be hit from the side and damaged as shown in FIG.

Therefore, conventionally, arch-shaped guards 38 (see FIGS. 7 and 8) made of a pipe material are erected on both sides of each roller support member 34 on each bracket 26. These guards 38 serve to protect the bearing 36 and the like from the rope 18 and prevent the fallen rope 18 from catching on the protrusion so that the rope 18 is smoothly guided to the rope guide roller 24 side.

[0008]

[Problems to be solved by the device]

 In the above device, the rope 18 may move up and down above the bearing 36 depending on the operating condition of the crane. Here, since the guard 38 is only erected on the outer side of the roller supporting member 34, it is possible to prevent the rope 18 from hitting the bearing 36 from this direction (solid line in FIG. 9 (b)), but it is sharp. It is not possible to prevent the rope 18 from dancing and hitting the bearing 36 from directly above (dashed line in FIG. 9B) due to various load fluctuations.

In view of such circumstances, an object of the present invention is to provide a rope guide device that can more reliably protect the bearing that supports the rope guide roller.

[0010]

[Means for Solving the Problems]

 As a means for solving the above problems, the present invention provides a rope guide roller in a crane boom that extends in the width direction of a crane boom and supports a rope arranged along the back surface of the crane boom from the side close to the back surface of the crane boom. And a pair of roller support members that are provided upright on the rear surface of the crane boom and have bearing portions that rotatably support both ends of the rope guide roller. A guard is provided in the region from the outer side of the bearing of the roller supporting member to at least the upper side as viewed in the longitudinal direction of the roller supporting member to prevent the rope from coming into contact with the bearing from the outer side and the upper side. This is true (Claim 1).

It is more preferable that the guards are provided in front of and behind the position where the roller support member is disposed (Claim 2). In this case, each guard is formed by bending a single bar. What was formed by this is suitable (Claim 3).

Further, the guard is formed in an arch shape extending from the outer side of the roller supporting member to the inner side of the roller supporting member across the bearing portion when viewed in the longitudinal direction of the crane boom. It is more preferable to fix both ends to the crane boom side (Claim 4). In this case, the guard is positioned above the roller support member from the outside and inside of the roller support member in the longitudinal direction of the crane boom, and at a position above one of the pillars above the bearing. It is composed of an intermediate part that is connected to the other column part through, and the curvature of the boom width direction inner part of this intermediate part is made larger than the curvature of the boom width direction outer part. The effect is obtained (Claim 5).

[0013]

[Action]

 According to the above device, since the guard is present in the region from the outer side of the bearing part of the roller support member to at least the upper part when viewed in the longitudinal direction of the crane boom, the rope that has fallen outside the guard is prevented. In addition to preventing the above-mentioned bearing from being hit from the outside, the rope is also prevented from hitting the above-mentioned bearing from above due to a sudden load change or the like.

Here, in the apparatus according to the second aspect, since the guards are provided in front of and behind the position where the roller support member is disposed, the roller support member itself is opened outward and laterally thereof. Therefore, it is possible to easily perform maintenance of the bearing and the like without removing the guard. Further, it is possible to use a bent bar as described in claim 3 as a guard, which reduces the size and weight of the guard and simplifies its structure.

Further, in the apparatus according to the fourth aspect, the guard extends from the outer side of the roller support member to the inner side of the roller support member across the bearing portion when viewed in the longitudinal direction of the crane boom. Since it has an arched shape, the rigidity and mounting strength of the guard are significantly increased compared to the structure in which only one end of the guard is fixed to the crane boom side.

Further, in the device according to the fifth aspect, of the guard, in the intermediate portion straddling the bearing portion, the curvature of the inner portion in the boom width direction is large (that is, the guard is sharply bent from the inner column portion). Therefore, in this part, the rope is more effectively prevented from falling out of the guard. On the contrary, since the outer part of the middle part has a small curvature (that is, the guard is smoothly bent from the outer column part), once the rope has fallen out of the guard, it is smooth in the outer part of the middle part. The rope can be guided to the inner rope guide roller.

[0017]

【Example】

 A first embodiment of the present invention will be described with reference to FIGS. The concrete structure of the crane provided with the rope guide device 20 shown in this embodiment is the same as that shown in FIGS. 5 and 6, and the description thereof is omitted here.

The basic structure of the rope guide device 20 shown in this embodiment is the same as that shown in FIGS. 7 and 8. That is, a pair of front and rear brackets 26 are fixed to the specific two main boom columns 22 by U bolts 28 and nuts 30, and a roller support member 34 is fixed to these brackets 26 by bolts 32 or the like. . The roller support member 34 stands upright from the rear surface of the crane boom 14, and rotatably supports both ends (the left end in FIG. 1) of the rope guide roller 24 via bearings 36 on the upper part thereof. As shown in FIG. 7, the rope guide roller 24 extends in the width direction of the crane boom and supports the rope 18 from below, that is, from the side close to the back surface of the crane boom.

Further, as a feature of this embodiment, a guard 40 is fixed to the front and rear brackets 26. Each guard 40 is formed by bending one rod (preferably a pipe) into a U-shape, and when viewed in the longitudinal direction of the crane boom (state of FIG. 1), the outside of the roller support member 34. 1 (the left side in FIG. 1) and the inner side (the right side in FIG. 1) in a straight line, and a column portion 41 straddling the bearing 36 of the roller support member 34 in an arc shape. And the lower ends of both pillars 41 are fixed to the side surface of the bracket 26.

Next, the operation of the roller guide device 20 will be described.

Normally, the rope 18 is in a state of being supported from below by a rope guide roller 24 as shown in FIG. 7, and the rope guide roller 24 prevents contact between the rope 18 and the rear surface of the crane boom 14. However, when the rope 18 is loosened due to a change in operating conditions, the rope 18 may cross over the guard 40 in front of and behind the roller support member 34. In this case, if the rope 18 is tensioned again, the rope 18 can be smoothly guided to the inner rope guide roller 24 while sliding on the guard 40 (see arrow A in FIG. 1).

Here, in the conventional device shown in FIG. 7, the outside of the roller support member 34 is only covered by the guard 38, so that the rope 18 may dance and hit the bearing 36 from above. However, in the apparatus shown in FIGS. 1 and 2, since the guard 40 projects to above the bearing 36 in FIG. 1, it is possible to prevent the rope 18 from hitting from the outer side as well as from above. Therefore, the bearing 36 can be protected more reliably.

A second embodiment is shown in FIG. In this embodiment, the curvature of the inner portion 42b of the middle portion of the guard 40 is set to be larger than the curvature of the outer portion 42a. That is, the middle portion inner portion 42a has an arc shape with a large radius of curvature, while the middle portion outer portion 42b is in a state of being sharply bent at a substantially right angle.

According to such a device, the amount of curvature of the inner portion 42b of the intermediate portion is large, that is, the length of the inner column portion 41 is long, so that it is more effective than that shown in FIG. 1 above the rope guide roller 24. It is possible to prevent the rope 18 of the vehicle from overcoming the guard 40 and falling off to the outside (see the rope 18 shown by the solid line in FIG. 3). The outer portion 42a allows the rope 18 to be smoothly guided to the rope guide roller 24 in the same manner as the device shown in FIG. 1 (see the rope 18 shown by the chain double-dashed line in FIG. 1).

The present invention is not limited to the above embodiments, but may take the following modes as examples.

(1) In each of the above embodiments, the bearing 36 is protected by arranging the guard 40 formed by bending a rod material such as a pipe material in front of and behind the roller support member 34. It is possible to protect the bearing 36 even if the bearing 36 is directly covered from the outer side and the upper side with a guard. However, compared to such a structure, according to the apparatus of each of the above-described embodiments, the guard 40 can be made smaller and lighter, and the roller support member 34 itself is opened outward and laterally. Therefore, there is an advantage that the bearing 36 and the like can be easily maintained without removing the guard 40.

(2) In the above embodiment, the arch-shaped guard 40 extending from the outer side of the roller supporting member 34 to the inner side of the roller supporting member 34 through the upper portion of the bearing 36 is shown. Is to prevent the rope 18 from contacting the bearing 36 from at least the outer side and the upper side. For example, as shown in FIG. 4, the roller support member 34 is cut from the outer side to the upper side on the way. It may be hook-shaped. However, as compared with such a cantilever beam-like structure, if the guard 40 is formed in the arch shape shown in each of the above-mentioned embodiments, there is an advantage that the rigidity and the mounting strength can be dramatically improved. Further, the pillar portion 41 does not necessarily need to be orthogonal to the back surface of the crane boom 14, and may be upright in an inclined state.

(3) In the present invention, the roller support member and the guard may be attached to the rear surface of the crane boom by welding or the like regardless of the specific mounting structure.

(4) The present invention is not limited to the crawler crane as shown in FIG. 5, but can be widely applied to various cranes in which a rope is stretched on the back surface of the crane boom.

[0030]

[Effect of device]

 As described above, according to the present invention, in the area extending from the outer side of the bearing portion of the roller support member to at least the upper portion when viewed in the longitudinal direction of the crane boom, from the outer side and the upper side of the bearing portion. Since a guard is provided to prevent the rope from abutting, the rope not only prevents the rope dropped outside the guard from hitting the bearing part from the outside but also prevents sudden load. It is also possible to prevent the rope from hitting the bearing portion from above due to fluctuations and the like, and it is possible to more reliably protect the bearing portion.

Here, in the apparatus according to the second aspect, since the guards are provided in front of and behind the roller supporting member, the roller supporting member itself can be opened laterally and upwardly of the roller supporting member, and therefore the guard can be removed without removing it. Even so, there is an effect that maintenance of the bearing portion and the like can be easily performed. Further, by using the bent bar as the guard as described in claim 3, it is possible to reduce the size and weight of the guard and to simplify the structure.

Further, in the apparatus according to the fourth aspect, the guard extends from the outer side of the roller support member to the inner side of the roller support member across the bearing portion when viewed in the longitudinal direction of the crane boom. Since it has an arched shape, it has the effect of significantly increasing the rigidity and mounting strength of the guard, compared to a structure in which only one end of the guard is fixed to the crane boom side.

Further, in the device according to the fifth aspect of the present invention, in the guard, the inner portion of the guard straddling the bearing portion has a large curvature (that is, is sharply bent from the column portion), and the rope is outside the guard. While it is more effective to prevent the rope from falling off to the outside, the rope that has fallen outside the guard can be smoothly guided to the rope guide roller at the outer part where the curvature is small (that is, it bends smoothly from the outer column). There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a partial sectional front view showing a main part of a rope guide device according to a first embodiment of the present invention.

FIG. 2 is a plan view showing the main part.

FIG. 3 is a partially sectional front view showing a main part of a rope guide device according to a second embodiment.

FIG. 4 is a partially sectional front view showing a main part of a rope guide device according to another embodiment.

FIG. 5 is a side view showing an example of a crane to which the rope guide device is attached.

FIG. 6 is a plan view showing a part of a crane boom of the crane.

FIG. 7 is a cross-sectional view taken along the line BB in FIG. 6 and is a cross-sectional view showing an example of a conventional rope guide device.

FIG. 8 is a plan view showing a main part of the rope guide device.

9 (a) and 9 (b) are partial cross-sectional front views showing inconveniences when the above-mentioned rope guide device has no guard.

[Explanation of symbols]

 14 Crane boom 18 Rope 20 Rope guide device 24 Rope guide roller 34 Roller support member 40 Guard 41 Column part 42 Middle part 42a Middle part outer part 42b Middle part inner part

Claims (5)

[Scope of utility model registration request] 1. A rope guide roller that extends in the width direction of the crane boom and supports a rope arranged along the back surface of the crane boom from a side close to the back surface of the crane boom, and stands upright on the back surface of the crane boom. A rope guide device for a crane boom comprising a pair of roller support members having bearing portions for rotatably supporting both ends of the rope guide roller, wherein the bearing portion of the roller support member is seen from the longitudinal direction of the crane boom. A rope guide device for a crane boom, characterized in that a guard is provided in a region extending from the outer side to at least the upper side of the crane to prevent the rope from coming into contact with the bearing from the outer side and the upper side. 2. The rope guide device for a crane boom according to claim 1, wherein the guard is provided in front of and behind a position where the roller support member is disposed. 3. The rope guide device for a crane boom according to claim 2, wherein each guard is formed by bending a single rod. 4. The rope guide device for a crane boom according to claim 1, wherein the guard straddles the bearing portion from an outer side of the roller support member when the guard is viewed from a longitudinal direction of the crane boom. A rope guide device for a crane boom, characterized in that the roller support member is formed in an arch shape extending to the inside of the roller support member, and both ends thereof are fixed to the crane boom side. 5. The rope guide device for a crane boom according to claim 4, wherein the guard is a pillar portion that rises upward from the outer side and the inner side of the roller support member when viewed in the longitudinal direction of the crane boom. And an intermediate portion that is connected to the other pillar portion through a position above the bearing portion from one pillar portion,
A rope guide device for a crane boom, wherein a curvature of an inner portion of the intermediate portion in the width direction of the boom is made larger than a curvature of an outer portion of the boom width direction.