JP6950864B2 - boom - Google Patents

Description

The present invention relates to a boom mounted on a work vehicle such as a mobile crane or an aerial work platform.

Conventionally, in aerial work platforms used for electrical work, the work platform at the tip of the boom may come into contact with the live line, so that the boom has been required to have electrical insulation. Therefore, a technique is adopted in which only a part of the boom stages constituting the boom is made of an FRP material having excellent electrical insulation (see, for example, Patent Document 1).

In addition, in recent years, it has been proposed to use a lightweight and high-strength FRP material for the purpose of reducing the weight of the boom. The boom of FRP material installed in aerial work platforms uses a large slide plate that lowers the surface pressure in order to prevent deterioration due to temperature rise due to frictional heat. Further, in the boom made of FRP material, a rotation support method using a roller is also adopted because there is a possibility that the boom is worn and the strength is lowered due to the biting of foreign matter such as sand.

Japanese Patent No. 4959148

However, when the reaction force acting on the boom becomes large in a mobile crane or the like, none of the above-mentioned measures (large slide plate and roller) is realistic. Therefore, a boom that is lightweight and has excellent wear resistance has been desired.

Therefore, an object of the present invention is to provide a boom that is lightweight and has excellent wear resistance.

In order to achieve the above object, the boom of the present invention is a boom formed in a nested manner by an outer boom member and an inner boom member, and the inner boom member can be slidable on the outer boom member. A slide plate for supporting is attached, and the inner boom member is composed of an abrasion-resistant material installed at a position in contact with the slide plate and an FRP material installed at a position not in contact with the slide plate. NS.

Further, another form of the boom of the present invention is a boom formed in a nested manner by an outer boom member and an inner boom member, and the inner boom member is slidably supported by the outer boom member. The outer boom member is composed of a wear-resistant material installed at a position in contact with the slide plate and an FRP material installed at a position not in contact with the slide plate.

As described above, the boom of the present invention is a boom formed in a nested manner by the outer boom member and the inner boom member, and the outer boom member is a slide plate for slidably supporting the inner boom member. Is attached, and the inner boom member is composed of an abrasion-resistant material installed at a position in contact with the slide plate and an FRP material installed at a position not in contact with the slide plate. With such a configuration, it is possible to provide a boom that is lightweight and has excellent wear resistance.

Further, another form of the boom of the present invention is a boom formed in a nested manner by an outer boom member and an inner boom member, and the inner boom member is slidably supported by the outer boom member. The slide plate is attached, and the outer boom member is composed of an abrasion-resistant material installed at a position in contact with the slide plate and an FRP material installed at a position not in contact with the slide plate. With such a configuration, it is possible to provide a boom that is lightweight and has excellent wear resistance.

It is a side view of a rough terrain crane. It is explanatory drawing explaining the structure in the length direction of the boom of Example 1. FIG. It is sectional drawing of the tip side of the boom of Example 1. FIG. It is sectional drawing of the iron plate embedded in the outermost layer of the FRP material. It is sectional drawing of the iron plate adhered to the surface of the outermost layer of the FRP material. It is sectional drawing of the wear-resistant paint applied to the surface of the outermost layer of the FRP material. It is explanatory drawing explaining the structure in the length direction of the boom of Example 2. FIG. It is sectional drawing of the base end side of the boom of Example 2. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiment, a case where the boom 20 of the present invention is mounted on the rough terrain crane 1 as a crane (mobile crane) will be described, but the present invention is not limited to this, and is not limited to this, and is limited to an all-terrain crane, a cargo crane, or a truck. The present invention can be applied to other mobile cranes such as cranes and work vehicles such as aerial work platforms. In the following, a case where the FRP material is used only for the inner boom member will be described as Example 1, and a case where the FRP material is used for both the inner boom member and the outer boom member will be described as Example 2.

In this embodiment, a case where the FRP material is used only for the inner boom member on the tip side will be described.

(Overall configuration of the crane)
As shown in FIG. 1, the rough terrain crane 1 of the present embodiment includes a vehicle body portion 10 which is a main body portion of a vehicle having a traveling function, outriggers 11 provided at four corners of the vehicle body portion 10, and a vehicle body. A swivel base 12 attached to the portion 10 so as to be horizontally swivel, and a boom 20 attached to a bracket 13 erected on the swivel base 12 are provided.

The out-trigger 11 can slide out / slide outward from the vehicle body 10 in the width direction by expanding / contracting the slide cylinder, and the jack can be extended / jack-stored in the vertical direction from the vehicle body 10 by expanding / contracting the jack cylinder. It is possible.

The swivel base 12 has a pinion gear to which the power of the swivel motor is transmitted, and the pinion gear meshes with a circular gear provided on the vehicle body portion 10 to rotate around the swivel shaft. The swivel table 12 has a driver's cab 18 arranged on the front right side, a bracket 13 arranged in the rear center, and a counterweight 19 arranged in the rear lower part.

The boom 20 is formed in a nested manner by a base end boom 201, an intermediate boom 202, and a tip boom 203, and can be expanded and contracted by an expansion / contraction cylinder arranged inside. A sheave is arranged on the state-of-the-art boom head 204 of the tip boom 203, and a wire rope 16 is hung around the sheave to hang a hook block 17. Although the boom 20 having a three-stage configuration has been described here, the number of stages of the boom 20 is not limited, and the present invention can be applied to the boom 20 having two or more stages.

The outermost base end boom 201 is rotatably attached to a support shaft whose base portion is horizontally installed on the bracket 13, and can be undulated up and down with the support shaft as the center of rotation. Further, an undulating cylinder 15 is bridged between the bracket 13 and the lower surface of the base end boom 201, and the entire boom 20 can be undulated by expanding and contracting the undulating cylinder 15. Although not shown, a jib (not shown) can be further attached to the tip side of the tip boom 203.

(Composition of cross section of boom)
Hereinafter, two consecutive boom members arbitrarily selected from the nested booms 20 (201 to 203) will be described as the outer boom member 30 and the inner boom member 40. For example, the intermediate boom 202 is the outer boom member 30, and the tip boom 203 is the inner boom member 40.

Then, as shown in FIG. 2, a slide plate 32, ... For slidably supporting the inner boom member 40 is attached to the outer boom member 30 of this embodiment. More specifically, the outer boom member 30 has a slide plate 32, ... On the inner surface on the tip side (front). The inner boom member 40 has a slide plate 43, ... On the outer surface on the base end side (rear). FIG. 3 shows a cross section taken along the line AA, which is a cross section on the tip side of the boom 20 in FIG.

As shown in FIG. 3, the vicinity of the tip of the outer boom member 30 is formed of a quadrangle with rounded corners by a thin iron plate, and the main body 31 having a quadrangular cross section with rounded corners and the inner boom member 40 can be slidable. A plurality of slide plates 32, ... The present invention can be applied to any shape of the outer boom member 30, such as a quadrangle, a hexagon, and a lower round shape.

The slide plate 32 is formed in a plate shape by a synthetic resin or the like, and is arranged at a predetermined position between the outer boom member 30 and the inner boom member 40 in order to reduce friction. In the cross section, the slide plate 32 can be arranged in the vicinity of the corner portion, for example, as shown in FIG. In addition, a slide plate formed in an L shape is often placed at the corner. The slide plate 32 is arranged on the inner surface of the tip end portion of the outer boom member 30 in the length direction of the boom 20.

As shown in FIG. 3, the inner boom member 40 is formed of a quadrangle with rounded corners as a whole, and has an iron plate 41 as a wear-resistant material installed at a position in contact with the slide plate 32 on its outer surface. , The FRP material 42 installed at a position not in contact with the slide plate 32. However, since they basically do not come into contact with each other in a state where a load is applied, the two iron plates 41 and 41 arranged at the upper part may not be provided. The present invention can be applied to any shape of the inner boom member 40, such as a quadrangle, a hexagon, or a lower round shape. The iron plate 41 is arranged over the entire length of the boom 20 in contact with the slide plate 32 in the length direction. That is, the iron plate 41 is arranged over a substantially overall length excluding a part of the base end portion and the tip end portion of the inner boom member 40.

The wear-resistant material may be any material as long as it has a predetermined wear-resistant performance. For example, heat-treated carbon steel, a metal plate containing an iron plate containing graphite, nylon, or high-density polyethylene There is a resin plate containing. It is also possible to apply a lubricating oil having a property of not easily deteriorating the slide plate 32 to the surface of the iron plate 41 as an wear-resistant material.

The FRP material 42 is a so-called CFRP (carbon fiber reinforced plastic), and is characterized by being lightweight and having high strength and rigidity. As described in the first to third aspects below, iron plates 41, 41A or wear resistant paint 41B as wear resistant materials are installed on the outer surface of the FRP material 42.

As a first aspect, as shown in FIG. 4, it is preferable that the iron plate 41 as the wear-resistant material is embedded in the outermost layer of the FRP material 42 at a position in contact with the slide plate 32. That is, a layer having high wear resistance is constructed on the surface of the FRP material 42 by structurally embedding the iron plate 41 in the vicinity of the surface of the FRP material 42 in the middle of the manufacturing process of the FRP material 42.

As a second aspect, as shown in FIG. 5, it is also preferable that the iron plate 41A as the wear-resistant material is adhered to the surface of the outermost layer of the FRP material 42 at a position in contact with the slide plate 32. That is, by applying an adhesive to the surface of the FRP material 42 and attaching the iron plate 41A, a layer having high wear resistance is constructed on the surface of the FRP material 42.

As a third aspect, as shown in FIG. 6, it is also preferable that the wear-resistant paint 41B as the wear-resistant material is applied to the surface of the outermost layer of the FRP material 42 at a position in contact with the slide plate 32. As the abrasion resistant paint 41B, for example, an epoxy-based or fluorine-based resin paint can be considered. Further, it is also preferable to divide these epoxy-based or fluorine-based resin paints into a plurality of layers and coat them in layers.

(Action / effect)
Next, the actions and effects of the boom 20 of this embodiment will be listed and described.

(1) As described above, the boom 20 of this embodiment is a boom 20 formed in a nested manner by an outer boom member 30 and an inner boom member 40, and the outer boom member 30 is an inner boom member 40. The inner boom member 40 has a slide plate 32 that slidably supports the slide plate 32, and the inner boom member 40 is installed at a position that is in contact with the slide plate 32 and an iron plate 41 as an abrasion-resistant material that is installed at a position that does not contact the slide plate 32. It is composed of FRP42 material. With such a configuration, it is possible to provide a boom that is lightweight and has excellent wear resistance.

(2) Further, the wear-resistant material is preferably an iron plate 41 embedded in the outermost layer of the FRP material 42 at a position in contact with the slide plate 32. With such a configuration, the iron plate 41, which is a wear-resistant material, can be firmly fixed in the FRP material 42.

(3) Further, it is also preferable that the wear-resistant material is an iron plate 41A that is adhered to the surface of the outermost layer of the FRP material 42 at a position in contact with the slide plate 32. With such a configuration, the iron plate 41A, which is a wear-resistant material, can be arranged in the FRP material 42 by a simple method without requiring a significant improvement in the structure.

(4) Further, the wear-resistant material is preferably the wear-resistant paint 41B coated on the surface of the outermost layer of the FRP material 42 at a position in contact with the slide plate 32. With such a configuration, the wear-resistant material can be arranged in the FRP material 42 by a simple method without requiring a significant improvement in the structure.

In this embodiment, a case where the FRP material is used for both the inner boom member and the outer boom member will be described. The same or equivalent parts as those described in the first embodiment will be described with the same reference numerals.

(Overall configuration of the crane)
Since the overall configuration of the crane is the same as that of the first embodiment, the description thereof will be omitted.

(Composition of cross section of boom)
Hereinafter, as in the first embodiment, two consecutive boom members arbitrarily selected from the nested booms 20 (201 to 203) will be described as the outer boom member 50 and the inner boom member 60. For example, the intermediate boom 202 is the outer boom member 50, and the tip boom 203 is the inner boom member 60.

Then, as shown in FIG. 7, a slide plate 62, ... To be slidably supported by the outer boom member 50 is attached to the inner boom member 60 of this embodiment. More specifically, the inner boom member 60 has a slide plate 62, ... On the outer surface on the proximal end side (rear). The outer boom member 50 has a slide plate 53, ... On the inner surface on the tip side (front). FIG. 8 shows a cross section taken along the line BB, which is a cross section on the base end side of the boom 20 in FIG. 7.

Here, since the relationship between the "tip side" of the outer boom member 50 and the inner boom 60 is substantially the same as that of the first embodiment, the description thereof will be omitted. In the following, the "base end side" of the inner boom 60 and the outer boom 50 The relationship will be explained.

As shown in FIG. 8, the vicinity of the base end portion of the inner boom member 60 is formed of a quadrangle with rounded corners by a thin iron plate, and the main body 61 (near the tip portion and the vicinity of the base end portion) having a quadrangular cross section with rounded corners. Most of them are composed of an FRP material 61a and an iron plate 61b), and a plurality of slide plates 62, ... For slidably supported by the outer boom member 50. The present invention can be applied to any shape of the inner boom member 60, such as a quadrangle, a hexagon, or a lower round shape.

The slide plate 62 is formed in a plate shape by a synthetic resin or the like, and is arranged at a predetermined position between the outer boom member 50 and the inner boom member 60 in order to reduce friction. In the cross section, the slide plate 62 can be arranged in the vicinity of the corner portion, for example, as shown in FIG. In addition, a slide plate formed in an L shape is often placed at the corner. The slide plate 62 is arranged on the outer surface of the base end portion of the inner boom member 60 in the length direction of the boom 20.

As shown in FIG. 8, the outer boom member 50 is formed as a quadrangle with rounded corners as a whole, and has an iron plate 51 as an wear-resistant material installed at a position in contact with the slide plate 62 on the inner surface thereof. , FRP material 52 installed at a position not in contact with the slide plate 62. However, since they basically do not come into contact with each other in a state where a load is applied, the two iron plates 51 and 51 arranged at the bottom may not be provided. The present invention can be applied to any shape of the outer boom member 50, such as a quadrangle, a hexagon, or a lower round shape. The iron plate 51 is arranged over the entire length of the boom 20 in contact with the slide plate 62 in the length direction. That is, the iron plate 51 is arranged over the substantially overall length of the outer boom member 50 excluding a part of the base end portion and the tip end portion. The details of the wear-resistant material and the FRP material 52 are substantially the same as those in the first embodiment, and thus the description thereof will be omitted.

Although not shown, an iron plate as a wear-resistant material or a wear-resistant paint is installed on the inner surface of the FRP material 52, as described in the first to third aspects of the first embodiment. That is, as a first aspect, it is preferable that the iron plate (51) as the wear-resistant material is embedded in the outermost layer of the FRP material 52 at a position in contact with the slide plate 62, as in FIG. Further, as a second aspect, it is also preferable that the iron plate (51A) as the wear-resistant material is adhered to the surface of the outermost layer of the FRP material 52 at a position in contact with the slide plate 62, as in FIG. Further, as a third aspect, similarly to FIG. 6, the wear-resistant paint (51B) as the wear-resistant material is applied to the surface of the outermost layer of the FRP material 52 at a position in contact with the slide plate 62. Is also preferable.

(Action / effect)
Next, the action / effect of the boom 20 of this embodiment will be described.

(1) As described above, the boom 20 of the present embodiment is a boom 20 formed in a nested manner by the outer boom member 50 and the inner boom member 60, and the inner boom member 60 has an outer boom member. A slide plate 62 for slidably supporting the slide plate 62 is attached, and the outer boom member 50 does not contact the iron plate 51 as a wear-resistant material installed at a position in contact with the slide plate 62 and the slide plate 62. It is composed of FRP52 material installed at the position. With such a configuration, it is possible to provide a boom that is lightweight and has excellent wear resistance.

Since the other configurations and the effects are substantially the same as those of the above-described embodiment, the description thereof will be omitted.

Although the first and second embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to the first and second embodiments, and the design does not deviate from the gist of the present invention. Modifications are included in the present invention.

For example, in Examples 1 and 2, the FRP material is used for a part of the booms 20, but the present invention is not limited to this, and the FRP material may be used for all the booms 201 to 203. Of course you can.

Then, although not particularly limited in Examples 1 and 2, the boom 20 (30, 40, 50, 60) of the present invention is applied only between specific boom members among the boom members (elements) having a plurality of stages. It can be applied or can be applied between all boom members.

Further, the present invention can be applied to a jib attached to the tip of the boom 20. For example, when the jib has a two-stage structure, both the proximal end side (outer) jib member and the distal end side (inner) jib member are made of FRP material, and the wear resistant material is used at the position where the distal end side jib member is in contact with the slide plate. Can be configured to use the FRP material in a position where it does not touch. By forming the jib in a composite structure of the FRP material and the wear-resistant material in this way, the effect of weight reduction becomes extremely large.

In the second embodiment, the FRP material is used for both the inner boom member 60 and the outer boom member 50. However, even when the FRP material is used only for the outer boom member 50, the outer boom member 50 is used. It has a similar configuration.

1: Rough terrain crane;
20: Boom;
201: Base boom; 202: Intermediate boom; 203: Tip boom;
30: Outer boom member;
31: Main body; 32: Slide plate;
40: Inner boom member;
41: Iron plate (embedded); 41A: Iron plate (adhesive); 41B: Abrasion resistant paint (painting);
42: FRP material; 43: slide plate;
50: Outer boom member;
51: Iron plate (embedded); 52: FRP material; 53: Slide plate;
60: Inner boom member;
61: Main body; 62: Slide plate;

Claims (6)

A boom that is nested by an outer boom member and an inner boom member.
A slide plate for slidably supporting the inner boom member is attached to the outer boom member.
The inner boom member is composed of a wear-resistant material installed at a position in contact with the slide plate and an FRP material installed at a position not in contact with the slide plate .
The wear-resistant material is a boom , which is an iron plate embedded in the outermost layer of the FRP material at a position in contact with the slide plate. A boom that is nested by an outer boom member and an inner boom member.
A slide plate for slidably supporting the inner boom member is attached to the inner boom member.
The outer boom member is composed of a wear-resistant material installed at a position in contact with the slide plate and an FRP material installed at a position not in contact with the slide plate .
The wear-resistant material is a boom , which is an iron plate embedded in the outermost layer of the FRP material at a position in contact with the slide plate. A boom that is nested by an outer boom member and an inner boom member.
A slide plate for slidably supporting the inner boom member is attached to the outer boom member.
The inner boom member is composed of a wear-resistant material installed at a position in contact with the slide plate and an FRP material installed at a position not in contact with the slide plate .
The wear-resistant material is a boom , which is an iron plate adhered to the surface of the outermost layer of the FRP material at a position in contact with the slide plate. A boom that is nested by an outer boom member and an inner boom member.
A slide plate for slidably supporting the inner boom member is attached to the inner boom member.
The outer boom member is composed of a wear-resistant material installed at a position in contact with the slide plate and an FRP material installed at a position not in contact with the slide plate .
The wear-resistant material is a boom , which is an iron plate adhered to the surface of the outermost layer of the FRP material at a position in contact with the slide plate. A boom that is nested by an outer boom member and an inner boom member.
A slide plate for slidably supporting the inner boom member is attached to the outer boom member.
The inner boom member is composed of a wear-resistant material installed at a position in contact with the slide plate and an FRP material installed at a position not in contact with the slide plate .
The wear-resistant material is a boom , which is a wear-resistant paint applied to the surface of the outermost layer of the FRP material at a position in contact with the slide plate. A boom that is nested by an outer boom member and an inner boom member.
A slide plate for slidably supporting the inner boom member is attached to the inner boom member.
The outer boom member is composed of a wear-resistant material installed at a position in contact with the slide plate and an FRP material installed at a position not in contact with the slide plate .
The wear-resistant material is a boom , which is a wear-resistant paint applied to the surface of the outermost layer of the FRP material at a position in contact with the slide plate.

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