JP2005053681A - Telescopic boom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a telescopic boom capable of reducing overall height of a line member and facilitating installation of the line member to a boom main body. <P>SOLUTION: The line member 40 extending along the boom main body 36 is guided by a first guiding protective member 42a of which one end side is fixed to a first boom member 31, the other end side is fixed to a third boom member 33 and an intermediate part has a bend and reverse part G1 projecting toward a base end side of the boom main body 36 and by a second guiding protective member 42b of which one end side is fixed to the third boom member 33, the other end side is fixed to a fifth boom member 35 and an intermediate part has a bend and reverse part G2 projecting toward the base end side of the boom main body 36. The second guiding protective member 42b is arranged so as to be positioned in an inside region of the first guiding protective member 42a at the time of contraction of the boom main body 36. At the time of full contraction of the boom main body 36, the bend and reverse part G2 of the second guiding protective member 42b enters inside of the bend and reverse part G1 of the first guiding protective member 42a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a telescopic boom in which line-shaped members such as an oil feeding hose and a signal transmission line are disposed along a boom body that is configured to be telescopically movable.

  A telescopic boom provided in an aerial work platform, a crane truck or the like includes a boom main body in which a plurality of boom members are nested, and a boom telescopic means for moving the boom main body relative to each other by relatively moving the plurality of boom members. (For example, a telescopic cylinder). For such telescopic booms, pressure oil is supplied to actuators arranged on the tip side of the boom (for example, telescopic cylinders arranged on the upper side of the boom or hydraulic motors that swing the work platform of an aerial work platform). A line-shaped member consisting of an oil feeding hose and a signal transmission line connecting the base end side and the tip end side of the boom is provided, and the whole is expanded and contracted in accordance with the expansion and contraction movement of the boom body. ing.

In order to enable expansion / contraction in accordance with the expansion / contraction movement of the boom body, the line-shaped member is installed in a form having a plurality of bending inversion portions inside or outside the expansion / contraction boom. Specifically, the line-shaped member is bent and inverted so as to be convex toward the proximal end side of the telescopic boom and bent so as to be convex toward the distal end side. The reversing sections are alternately arranged in the height direction of the boom. Here, the line-shaped member is supported on the telescopic boom by a belt-shaped protective guide member or the like installed along the boom body (see, for example, the following patent document).
JP-A-8-108997

  However, when the line-shaped members are arranged so that the reversing portions bent and reversed in the U-shape as described above are alternately positioned in the height direction of the boom, the height direction of the entire line-shaped member ( In some cases, the dimension of the telescopic boom (in the height direction) becomes large, and the mounting design (layout) for the telescopic boom becomes difficult.

  The present invention has been made in view of such a problem, and can reduce the overall dimension in the height direction of the entire line-shaped member, and can facilitate the design of the attachment of the line-shaped member to the boom body. The purpose is to provide a telescopic boom.

  In order to achieve such an object, the telescopic boom according to the present invention includes a boom body in which first, second, third, fourth and fifth boom members are configured in a nested manner in order from the base end side, At least one of a boom expansion / contraction means (for example, the expansion cylinder 37 in the embodiment) that moves each boom member to expand and contract the entire boom body, and an oil supply member and a power transmission member that extend in the expansion / contraction direction of the boom body. In the telescopic boom having one line-shaped member, one end side is fixed to the first boom member, the other end side is fixed to the third boom member, and the intermediate portion is directed toward the base end side of the boom body. A first protection guide member (for example, the first protection guide member 42a in the embodiment) having a bent reversal portion having a convex shape, one end side is fixed to the third boom member, and the other end side is fifth. A second protection guide member (for example, the second protection guide member 42b in the embodiment) having a bent reversal portion fixed to the boom member and projecting toward the proximal end of the boom body at the intermediate portion; The second protection guide member is disposed so as to be positioned in the inner region of the first protection guide member when the boom body is reduced, and the line-shaped member is guided by the first protection guide member. After extending from the one end side of the first protective guide member to the other end side through the intermediate portion, it is guided by the second protective guide member and from the one end side of the second protective guide member to the other end side through the intermediate portion. It extends.

  In the telescopic boom according to the present invention, each of the two protective guide members for guiding the line-shaped member has a bent reversal portion having a convex shape (U-shaped) on the proximal end side of the boom body. Since the protective guide member is disposed so as to be positioned in the inner region of the other protective guide member when the boom body is contracted, when the boom body is fully contracted, one bending inversion portion is located inside the other bending inversion portion. Get in. For this reason, the height direction as a whole line-shaped member compared with the conventional structure by which the line-shaped member is arrange | positioned so that the bending reversal part bent and reversed in U shape may be located in the height direction of a boom main body alternately. The dimension in the height direction of the boom body can be reduced, and the mounting design (layout) of the line-shaped member to the boom body becomes very easy.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 2 shows an aerial work vehicle 1 equipped with a telescopic boom according to an embodiment of the present invention. This aerial work vehicle 1 includes tire-type wheels 11, 11,..., A truck-type traveling body 10 that can be driven from the driver's seat 12, a swivel base 20 provided on the traveling body 10, and the swivel base. The telescopic boom 30 attached to the upper part of the support column 21 extending upward from 20 by a foot pin 22 so as to be swingable up and down, and the work platform 60 for boarding an operator attached to the tip of the telescopic boom 30 It is comprised.

  The swivel base 20 is attached to the upper part of the traveling body 10 so as to be rotatable 360 degrees around a vertical axis. A turning motor (hydraulic motor) 23 is provided inside the traveling body 10, and by rotating the turning motor 23, the turntable 20 can be horizontally turned through a gear (not shown). The telescopic boom 30 has a first boom member 31, a second boom member 32, a third boom member 33, a fourth boom member 34, and a fifth boom member 35 that are arranged in a telescoping manner in the boom body 36. The telescopic cylinder (hydraulic cylinder) 37 has a telescopic cylinder 37, and the telescopic cylinder 37 is telescopically operated so that each boom is connected to each boom via a telescopic wire and a contracting wire (both not shown). By relatively moving the members 31, 32, 33, 34, and 35, the entire boom body 36 can be expanded and contracted in the longitudinal direction. Further, a hoisting cylinder (hydraulic cylinder) 24 is straddled between the first boom member 31 located on the most proximal side and the swivel base 20, and the telescopic boom 30 is operated by extending and retracting the hoisting cylinder 24. It is possible to move the whole up and down within the vertical plane.

  A vertical post holding bracket 38 is attached to the distal end portion of the fifth boom 35 located on the most distal end side of the boom body 36, and the lower end of the vertical post 52 is connected to the vertical post holding bracket 38 via a swing pin 51. Part is attached. The vertical post 52 is configured so that the vertical posture is always maintained by a leveling device (not shown) provided in the telescopic boom 30 regardless of the undulation angle of the telescopic boom 30.

  The work table 60 has a box shape, and is rotatably attached to the upper end portion of the vertical post 52 via a work table holding bracket 61 that protrudes to the outside. A swing motor (hydraulic motor) 62 is provided inside the worktable holding bracket 61. By swinging the swing motor 62, the worktable 60 is swung around the vertical post 52 (horizontal). Swivel motion). Here, since the vertical post 52 is always maintained in the vertical posture as described above, as a result, the floor surface of the work table 60 is always held horizontally regardless of the undulation angle of the telescopic boom 30.

  Outrigger jacks 13, 13,... Are provided at the front, rear, left and right portions of the traveling body 10 to support the traveling body 10 in operation in a stable state. Each outrigger jack 13 includes an outer jack (cylinder tube) 13a extending in the up / down direction, an inner jack (piston rod) 13b provided in the outer jack 13a that is extendable in the vertical direction, and a lower end portion of the inner jack 13b. Each of the outrigger jacks 13 is moved (extends) the inner jack 13b downward, and the jack pad 13c is grounded and stretched to the ground. The traveling body 10 can be supported in the lifted state. Further, each outrigger jack 13 can be extended to the side of the traveling body 10, so that higher stability of the traveling body 10 can be obtained.

  On the work table 60, a work table moving operation device 63 for performing the operation of moving the work table 60, that is, the swiveling operation of the swivel table 20, the raising and lowering of the telescopic boom 30, and the swinging operation of the work table 60 is provided. ing. An operator who has boarded the work table 60 operates the work table moving operation device 63 to rotate the turning motor 23, extend / contract the hoisting cylinder 24, extend / contract the expansion cylinder 37, and rotate the swing motor 62. Each work operation can be performed to move the workbench 60 to a desired position.

  FIG. 1 is an enlarged side view of a telescopic boom 30 in the aerial work platform 1. As shown in this figure, on the side surface of the boom body 36 in the telescopic boom 30, there are an oil feeding hose for supplying hydraulic oil to the swing motor 62, and the work table moving operation device 63 provided on the work table 60. A line-shaped member 40 including a signal transmission line and the like that connects to a controller (not shown) provided on the traveling body 10 is provided. The line-shaped member 40 is guided by a belt-shaped protective guide member 42 (this protective guide member is composed of two members, a first protective guide member 42a and a second protective guide member 42b). The two protective guide members 42a and 42b are provided with two fixed support members 43 (first support member 43a and second support member 43b) and two telescopic support members 45 (third support member) provided on the side surface of the boom body 36. 45a and a fourth support tool 45b).

  Protective guide members 42 (first protective guide member 42a and second protective guide member 42b) that protect the line-shaped member 40 from external impacts and smoothly guide the line-shaped member 40 according to the expansion and contraction of the boom body 36. As shown in FIG. 3, the first link member 42p and the second link member 42q are alternately connected via the pin member 42r, and the direction of the arrow A shown in the figure (line (Corresponding to the extending direction of the shaped member 40). A space 42s is formed inside the first link member 42p and the second link member 42q, and the line-shaped member 40 is accommodated in the space 42s. Further, as shown in FIG. 4A, the fixed support tool 43 is formed of a member having a U-shaped cross section that opens upward, and the boom body 36 (specifically, the first boom member 31). Fixed on top. On the other hand, as shown in FIG. 4 (B), the telescopic support tool 45 is constructed by nesting two members having a U-shaped cross section that opens upward (hereinafter, the outer member is referred to as the outer member). 45p, the inner member may be referred to as an inner member 45q). The distal end portion of the outer member 45p and the distal end portion of the inner member 45q are different from the distal end portions of the boom members (for example, the distal end portion of the second boom 32 and the distal end portion of the third boom member 33 in the case of the third support 45a). The boom body 36 is expanded and contracted in the direction of arrow B shown in FIG. The inner member 45q of the telescopic support tool 45 is supported by a roller rotatably provided on the side surface of the boom member, so that the posture is maintained stable even when the boom body 36 is expanded and contracted. (The roller will be described later).

  As described above, the protection guide member 42 includes the first protection guide member 42a and the second protection guide member 42b. The first protection guide member 42 a has one end fixed to the first boom member 31 and the other end fixed to the distal end portion of the third boom member 33, and projecting toward the proximal end side of the boom body 36 at the intermediate portion. It has the bent reversal part G1 of the shape. The second protection guide member 42b has one end fixed to the third boom member 33 and the other end fixed to the fifth boom member 35. The second protection guide member 42b protrudes toward the proximal end of the boom main body 36 at the intermediate portion. It has a bent inversion portion G2 having a shape. As shown in FIG. 1, the second protection guide member 42 b is disposed so as to be positioned in the inner region of the first protection guide member 42 a when the boom body 36 is reduced.

  As shown in FIGS. 1 and 5, the line-shaped member 40 is protected by the first protective guide member 42 a and the second protective guide member 42 b, and the side surface portion of the boom body 36 extends from the proximal end side to the distal end side. However, in the stage before being protected by the first protection guide member 42a, first, the first support tool 43a fixed to the first boom member 31 is extended from the proximal end side of the boom body 36 to the distal end side. Supported by Thereafter, the line-shaped member 40 is folded upward at the distal end portion of the first boom member 31 and bent and inverted so as to be convex toward the distal end side of the boom body 36 (to be U-shaped), The second support member 43b fixed at a position above the first support member 43a in the first boom member 31 extends from the distal end side of the boom body 36 to the proximal end side while being protected by the first protection guide member 42a. Supported by Then, after the first protection guide member 42a is folded upward at the base end portion of the first boom member 31 and bent and inverted so as to protrude toward the base end side of the boom body 36 (first protection guide member). This bending reversal portion in 42a corresponds to the bending reversal portion G1), and this time, while being protected by the first protective guide member 42a, the third support tool 45a moves from the base end side to the front end side of the boom body 36. Supported to extend. Here, as for the 3rd support tool 45a, the front-end | tip part of an outer member (member equivalent to the outer member 45p in FIG. 4 (B)) is attached to the front-end | tip part of the 2nd boom member 32 via fixing tool S1. The distal end portion of the inner member (the member corresponding to the inner member 45q in FIG. 4B) is attached to the distal end portion of the third boom member 33 via the fixture S2. Further, the outer surface of the outer member of the third support tool 45 a is lowered by the first roller R 1 provided at the distal end portion of the first boom member 31 and the second roller R 2 provided at the proximal end portion of the first boom member 31. It is supported.

  The line-shaped portion 40 that extends to the distal end side of the boom body 36 relative to the portion supported by the third support tool 45a is temporarily removed from the distal end portion of the third boom member 33 after being removed from the protection by the first protective guide member 42a. Wrapped to Then, after being bent and inverted so as to be convex toward the distal end side of the boom body 36, this time, it is protected by the second protective guide member 42 b and extends from the distal end side of the boom body 36 to the proximal end side. The second protection guide member 42b is folded downward at the base end portion of the first boom member 31 and then bent and inverted so as to protrude toward the base end side of the boom body 36 (second protection guide member). 42b, the bending reversal portion corresponds to the bending reversal portion G2), and the fourth support tool 45b extends from the proximal end side to the distal end side while being protected by the second protection guide member 42b. Supported by Here, as for the 4th support tool 45b, the front-end | tip part of an outer member (member equivalent to the outer member 45p in FIG. 4 (B)) is attached to the front-end | tip part of the 4th boom member 34 via fixing tool S3. The distal end portion of the inner member (the member corresponding to the inner member 45q in FIG. 4B) is attached to the distal end portion of the fifth boom member 35 via the fixture S4. The outer member of the fourth support 45b is a third roller R3 provided at the tip of the third boom member 33, a fourth roller R4 provided at the tip of the second boom member 32, and the first boom member. The lower surface is supported by a fifth roller R5 provided at the distal end of 31 and a sixth roller R6 provided at the proximal end of the first boom member 31.

  Here, the line-shaped member 40 is fixed to the inner member of the third support 45a while being protected by the first protective guide member 42a, and is protected by the second protective guide member 42b. It is being fixed with respect to the inner member in the 4th support tool 45b with a state. For this reason, when the boom main body 36 expands and contracts, the first and second protection guide members 42a and 42b move together with these inner members.

  Further, one end side (the lower end side in FIG. 1) of the first protection guide member 42 a is fixed to the first boom member 31 by being fixed to the second support member 43 b fixed to the first boom member 31. The fixed range is indicated by a hatched area D1 in FIG. 1, and the other end side (the upper end side in FIG. 1) of the first protective guide member 42a is fixed to the third boom member 33. It is in a state of being fixed to the third boom member 33 by being fixed to the inner member of the third support tool 45a (this fixed range is indicated by a hatched area D2 in FIG. 1). Further, one end side (the upper end side in FIG. 1) of the second protection guide member 42b is fixed to the third boom member 33 by a fixing tool S5 (this fixing range is indicated by a hatched area D3 in FIG. 1). The other end side (the lower end side in FIG. 1) of the second protective guide member 42 b is fixed to the inner member of the fourth support member 45 b fixed to the fifth boom member 35, thereby being attached to the fifth boom member 35. It is in a fixed state (this fixed range is indicated by a hatched area D4 in FIG. 1).

  Here, when the telescopic cylinder 37 is extended from the fully contracted state of the boom body 36 (the state shown in FIG. 1) (the telescopic cylinder 37 is not shown in FIG. 1), each boom member 31, 32, 33, 34 is operated. , 35 move relative to each other, and the entire boom body 36 extends. When the boom body 36 extends, the inner member of the third support 45a moves relative to the second boom member 32 of the third boom member 33. The third member moves together with the third boom member 33 while sliding on the outer member in accordance with the extension operation, and the outer member of the third support 45a is first in accordance with the extension operation of the second boom member 32 with respect to the first boom member 31. It moves together with the second boom member 32 while rotating the roller R1 and the second roller R2. Further, the inner member of the fourth support tool 45b moves together with the fifth boom member 35 while sliding on the outer member with the extension operation of the fifth boom member 35 with respect to the fourth boom member 34, and the fourth support tool. The outer member 45b rotates the fourth boom member 34 while rotating the third roller R3, the fourth roller R4, the fifth roller R5, and the sixth roller R6 in accordance with the extension operation of the fourth boom member 34 with respect to the third boom member 33. Move with. As a result, the entire line-shaped member 40 moves in the extending direction in accordance with the extending operation of the boom body 36. The second roller R2 that supports the base end side of the boom main body 36 in the third support tool 45a and the sixth roller R6 that supports the base end side of the boom main body 36 in the fourth support tool 45b are respectively extended from the boom main body 36. Sometimes the dimension (the direction of the side of the boom main body 36) is extremely small so as not to interfere with the first protective guide member 42a (the dimension that can support the lower surface of the second support tool 45a or the fourth support tool 45b as a minimum). ).

  Further, when the telescopic cylinder 37 is contracted from the fully extended state of the boom body 36 (the state shown in FIG. 5) (the telescopic cylinder 37 is not shown in FIG. 5), each boom member 31, 32, 33, 34, When the boom body 36 contracts, the inner member of the third support member 45a and the inner member of the fourth support member 45b move to the outer members. Move in the direction of being accommodated inside. As a result, the entire line-shaped member 40 protected by the protection guide member 42 (the first protection guide member 42a and the second protection guide member 42b) moves in the contraction direction.

  Thus, in the telescopic boom 30 provided in the aerial work vehicle 1, the two protective guide members (the first protective guide member 42a and the second protective guide member 42b) for guiding the line-shaped member 40 are respectively boom bodies. 36 has a bent reversal portion (G1 and G2) having a convex shape (U-shape) on the proximal end side of 36, and one of the protective guide members (second protective guide member 42b) is used when the boom body 36 is reduced. Since the other protective guide member (first protective guide member 42a) is disposed so as to be located within the inner region, when the boom main body 36 is fully contracted, one of the bending reversal portions (G2) is bent and reversed. Enter inside the part (G1). Therefore, the overall height of the line-shaped member 40 is higher than that of the conventional configuration in which the line-shaped members are arranged so that the bent reversal portions bent and reversed in the U-shape are alternately positioned in the height direction of the boom body. The dimension in the direction (the height direction of the boom main body 36) can be reduced, and the mounting design (layout) of the line-shaped member 40 to the boom main body 36 becomes very easy.

  The preferred embodiments of the present invention have been described so far, but the scope of the present invention is not limited to those shown in the above-described embodiments. For example, in the above-described embodiment, the line-shaped member 40 is attached to the outside (side surface portion) of the boom main body 36, but the line-shaped member 40 may be attached to the inside of the boom main body 36.

  In the above-described embodiment, the line-shaped member 40 is described as a single member from the proximal end side to the distal end side of the boom main body 36. However, this is an example, and a connecting member is provided in the middle. A plurality of line-shaped members may be connected to each other. In particular, when the line-shaped member is composed only of a pipe member such as an oil feed pipe, a flexible hose member is disposed at a portion that is deformed (bent) in accordance with the expansion and contraction of the boom main body 36, and the boom main body 36. To a portion that does not deform even if it expands and contracts (for example, in the above example, a portion supported by the first support tool 43a or a portion between the first protection guide member 42a and the second protection guide member 42b). May be arranged with a piping member composed of metal or the like as a base. Moreover, the line-shaped member 40 should just consist of at least one of an oil feeding member and a power transmission member.

  Moreover, although the aerial work vehicle equipped with the telescopic boom according to the present invention is configured to travel by tire wheels in the above-described embodiment, it does not necessarily have to travel by tire wheels. For example, the vehicle may travel. Alternatively, it may be an aerial work platform for traveling on a track with wheels for traveling on a track, or an aerial work vehicle for both track and road equipped with both tire wheels and wheels for traveling on a track. . Further, in the above-described embodiment, the case where the telescopic boom according to the present invention is applied to an aerial work vehicle is shown, but this is an example, and it can also be applied to other boom work vehicles, for example, crane vehicles. It is.

It is a side view of the telescopic boom in the aerial work vehicle including the telescopic boom according to one embodiment of the present invention (when the boom body is fully contracted). It is a side view of the aerial work vehicle. It is a perspective view which shows the structure (part) of the protection guide member which protects and guides a line-shaped member. (A) is a perspective view which shows the structure of a fixed support tool, (B) is a perspective view which shows the structure of a telescopic support tool. It is a side view of the telescopic boom (when the boom body is fully extended).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Aerial work vehicle 30 Telescopic boom 31 1st boom member 32 2nd boom member 33 3rd boom member 34 4th boom member 35 5th boom member 36 Boom main body 37 Telescopic cylinder (boom expansion-contraction means)
40 line-like member 42a first protection guide member (first protection guide member)
42b 2nd protection guide member (2nd protection guide member)
43a 1st support tool 43b 2nd support tool 45a 3rd support tool 45b 4th support tool G1 bending reversal part of the 1st protection guide member G2 bending reversal part of the 2nd protection guide member

Claims (1)

A boom main body in which the first, second, third, fourth and fifth boom members are configured in a nested manner in order from the base end side, and the boom members are expanded and contracted by relatively moving the boom members. In a telescopic boom comprising a boom telescopic means and a line-shaped member comprising at least one of an oil feeding member and a power transmitting member provided extending in the telescopic direction of the boom body,
A first end is fixed to the first boom member and the other end is fixed to the third boom member, and has a bent reversal portion having a shape protruding toward the base end side of the boom body at the intermediate portion. A protective guide member,
A second end having one end side fixed to the third boom member and the other end side fixed to the fifth boom member, and having a bent reversal portion having a shape protruding toward the base end side of the boom body at the intermediate portion. A protective guide member,
The second protection guide member is disposed so as to be located in an inner region of the first protection guide member when the boom body is contracted.
The line-shaped member is guided by the first protection guide member and extends from the one end side of the first protection guide member to the other end side through the intermediate portion, and then the second protection guide member. The telescoping boom is characterized in that the telescopic boom extends from the one end side of the second protective guide member to the other end side through the intermediate portion.

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