JP2006335495A - Boom work machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a boom work machine simplified in a machining process of a connecting member and a boom and a fitting process of the connecting member in the boom, and reduced in the manufacturing cost. <P>SOLUTION: A connector fitting 40 for connecting a work bench 50 to a tip of the boom 30 has an insertion part 41 inserted into a tip opening part 30d of the boom 30 and a lower contact part (a flange part 43) to be brought in contact with a lower part 30e of an end face in the tip opening part 30d of the boom 30. The insertion part 41 of the connector fitting 40 and the tip part of the boom 30 are pivotally connected to the tip part of the boom 30 by the connecting member 45 extended in the right and left direction of the boom 30. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a boom working machine configured to include a working device at the tip of a boom, and more specifically, the working device is connected to the tip of the boom via a connection fitting attached to the tip of the boom. The present invention relates to a boom working machine having a configuration.

  As a boom working machine configured to include a working device at the tip of the boom, for example, an aerial work device having a work platform for boarding an operator at the tip of the boom, or a suspension device at the tip of the boom. Known crane devices and the like are known. In these boom working machines, the working device is attached to the tip of the boom via a coupling fitting attached to the tip of the boom, and the tip of the boom is caused by the weight of the working device, the downward load acting on the working device, or the like. A downward load (hereinafter referred to as a boom tip load) and a moment generated by this load are transmitted to the boom via the connection fitting.

Conventionally, the connecting bracket is attached to the tip of the boom by inserting the insertion portion formed in the connecting bracket into the opening of the tip of the boom, and then connecting the insertion portion of the connecting bracket and the tip of the boom to the left and right sides of the boom. It was performed by fastening with bolts attached to both sides (see, for example, the following patent document). For this reason, the load at the end of the boom and the moment generated thereby are transmitted from the connecting bracket to the boom via the bolt, and it is necessary to provide a relatively large number of bolts at the end of the boom.
Japanese Utility Model Publication No. 5-64186 JP 10-338484 A

  However, in the above-described conventional configuration, it is necessary to drill a large number of bolt holes in the connecting bracket, the tip of the boom, and the connecting bracket, and a large number of man-hours are required for processing the connecting member and the boom. In addition, since it is necessary to assemble the connecting member to the boom with a large number of bolts, a large number of man-hours are required in the assembly process, resulting in high costs.

  The boom working machine according to the present invention has been made in view of such problems, and can simplify the connecting member and boom processing steps and the connecting member assembly step to the boom, thereby reducing the manufacturing cost. An object of the present invention is to provide a boom working machine having a configuration that can be achieved.

  A boom working machine according to the present invention is a boom working machine (for example, an aerial work device 2 in the embodiment) configured to include a working device (for example, the work bench 50 in the embodiment) at the tip of the boom. The apparatus is connected to the tip of the boom via a connecting fitting attached to the tip of the boom, and the connecting fitting is an insertion portion inserted into the tip opening of the boom and a lower portion of the end face at the tip opening of the boom. The connecting portion of the connecting bracket and the tip of the boom are pivotally connected by a connecting member extending in the left-right direction of the boom. In this boom working machine, the front end opening of the boom is positioned at a position closer to the base end side of the boom than the coupling member on the upper surface of the insertion portion of the coupling fitting (for example, the upper portion 41a of the insertion portion 41 in the embodiment). It is preferable to have upper contact portions (for example, left and right front contact portions 47a and left and right rear contact portions 47b in the embodiment) that can come into contact with the upper portion of the inner wall.

  In the boom working machine according to the present invention, the connecting bracket for connecting the working device to the tip end portion of the boom is not only the insertion portion inserted into the tip opening portion of the boom, but also the lower portion in contact with the lower portion of the end surface at the tip opening portion of the boom. A boom tip load that acts on the connecting bracket and has a contact portion (the lower load acting on the tip of the boom due to the weight of the working device, the lower load acting on the working device, etc.) and the moment generated thereby are combined. The reaction force received from the member and the reaction force received from the lower part of the end face of the boom tip opening at the lower contact portion provided on the connecting fitting are supported. In such a configuration, most of the reaction force received by the connecting bracket from the bolt in the configuration in which the conventional boom and the connecting bracket are fastened by a large number of bolts is such that the lower contact portion is the end face at the tip opening of the boom. Therefore, it is not necessary to fasten the connecting member and the tip of the boom with a large number of bolts as in the prior art. Therefore, according to the present invention, the step of drilling the bolt hole can be reduced as compared with the conventional case, the boom processing step can be simplified, and the connecting bracket and the tip of the boom can be connected to each other. Since it is only necessary to couple these at the two places on the left and right side portions, it is easy to assemble the connecting bracket to the tip portion of the boom, and the manufacturing cost can be greatly reduced as compared with the prior art.

  In addition, if there is an upper contact portion that can come into contact with the upper part of the inner wall of the tip opening of the boom at a position closer to the base end of the boom than the coupling member on the upper surface of the insertion portion of the connection bracket, Since the acting moment can be supported also by the reaction force that the contact portion receives from the inner wall upper portion of the boom tip opening, it is possible to reduce the possibility that the boom tip will buckle and deform. It is possible to reduce the weight and increase the strength.

  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 an embodiment of the boom working machine of the present invention. The aerial work vehicle 1 has a revolving body 20 on an upper part of a traveling body (crawler traveling body) 10, and a boom (extensible boom) 30 is attached to the upper part of the revolving body 20 via a foot pin 23 so as to be freely raised and lowered. ing. A work table 50 is provided at the tip of the boom 30, and an operator (operator) OP can be on the work table 50. In the aerial work vehicle 1, the aerial work device 2 including the boom 30 and the work platform 50 corresponds to the boom working machine according to the embodiment of the present invention.

  The revolving unit 20 can be swung within a range of 360 degrees in a horizontal plane with respect to the traveling unit 10 by rotating a revolving motor (hydraulic motor) 21 provided inside the revolving unit 20, and the boom 30 can be revolved. The swinging body 20 can be raised and lowered by extending and contracting a lifting cylinder (hydraulic cylinder) 22 provided between the body 20 and the body 20. The boom 30 includes a proximal boom 30a, an intermediate boom 30b, and a distal boom 30c. The boom 30 is telescopically moved by extending and contracting a telescopic cylinder (hydraulic cylinder) 31 provided inside the boom 30. Can be made.

  A vertical post 32 is provided at the tip of the boom 30, and the work table 50 is rotatably attached to the vertical post 32. The work table 50 can be swung in the horizontal plane with respect to the vertical post 32 by rotating a swing motor (hydraulic motor) 51 provided in the vicinity of the vertical post 32. The vertical post 32 is always held in a vertical posture by a balancing device (not shown). As a result, the floor surface of the work table 50 is always kept in a horizontal posture.

  The work table 50 is provided with an upper operation device 52, which is provided with levers (not shown) for raising and lowering the boom 30, telescopic turning operation, and swinging operation of the work table 50. For this reason, the operator OP can freely move the work platform 50 on which he / she is riding by performing an operation of raising / lowering, extending / contracting and turning the boom 30 from the upper operation device 52 and an operation of swinging the work platform 50 around the vertical post 32. It is possible to work at a desired position at a desired position.

  The traveling body 10 includes one crawler traveling device 12 on each of the left and right sides of the frame 11. Each crawler traveling device 12 includes an activation wheel 12a attached to the rear part of the frame 11, an idler wheel 12b attached to the front part of the frame 11, and a crawler belt 12c wound around the activation wheel 12a and the idler wheel 12b. It is comprised. The starter wheels 12a of the left and right crawler travel devices 12 can be driven by rotating sprockets (not shown) by travel motors (hydraulic motors) 13 attached to the frames 11, respectively. By operating levers (not shown) provided in the device 52, the rotation / stop operation can be performed as desired.

  In the aerial work vehicle 1 having such a configuration, the work table 50 provided at the tip of the boom 30 is connected to a metal fitting attached to the tip of the boom 30 as shown in FIGS. 1, 3, and 4. 40 is connected to the tip of the boom 30 via 40. As shown in the figure, the connecting bracket 40 includes an insertion portion 41 inserted into the distal end opening 30d of the boom 30 (the distal end boom 30c), a vertical post support portion 42 extending outward from the boom 30, and an insertion portion 41. It has a frame-like flange portion 43 located at an intermediate portion with respect to the vertical post support portion 42. The insertion portion 41 and the vertical post support portion 42 are integrally formed parts, and a flange portion 43 is attached between the insertion portion 41 and the vertical post support portion 42 by welding or the like. The insertion part 41 of the connection fitting 40 has an upper part 41a provided extending in the left-right direction and left and right side parts 41b provided extending downward from the left and right end parts of the upper part 41a. A circular hole 44 is provided at the center. The vertical post support part 42 has two plate-like parts 42 a facing left and right, and the pin support part 42 b formed at the tip of each vertical post support part 42 penetrates the lower part of the vertical post 32 laterally. The both ends of the vertical post support pin P (see FIG. 3) provided in this manner are attached.

  In order to attach the connection fitting 40 to the boom 30, first, the insertion portion 41 of the connection fitting 40 is inserted into the tip opening 30d (of the tip boom 30c) of the boom 30. As a result, when the circular hole portions 44 provided on the left and right sides of the insertion portion 41 of the connecting fitting 40 coincide with the circular holes 33 provided on the left and right sides of the tip boom 30c, the cylindrical coupling member 45 is connected to the circular hole 33. And the two bolts B are attached through screw attachment holes 45a provided in the coupling member 45 so as to penetrate both the circular hole portions 44 (that is, in a state of extending in the left-right direction of the boom 30). The end portions of these two bolts B are respectively screwed into two screw holes 46a of a plate member 46 provided inward of the insertion portion 41. Note that a total of two plate members 46 are provided corresponding to the left and right coupling members 45 (in FIG. 1, the coupling member 45, the bolt B, and the plate member 46 are shown only on one side because of the space shown. ). Thereby, the insertion part 41 of the connection metal fitting 40 and the front-end | tip part of the boom 30 will be in the state linked by the two coupling members 45 extended in the left-right direction of the boom 30. FIG.

  In the state in which the connection fitting 40 is attached to the tip of the boom 30 in this way, the flange 43 of the connection fitting 40 is at least the lower end 30e of the end face of the tip opening 30d (of the tip boom 30c) of the boom 30 (FIG. 1). The upper surface 41 of the connecting metal fitting 40 is connected to the boom 30 via four upper contact portions (left and right front contact portions 47a and left and right rear contact portions 47b) provided at the upper four corners of the connection bracket 40. The inner wall upper portion 30f of the tip opening 30d can be contacted from below. Here, as shown in FIG. 3, of the four upper contact portions, the left and right front contact portions 47 a are more distal to the boom 30 than the coupling member 45 on the upper surface of the insertion portion 41 (upper portion 41 a) of the coupling fitting 40. The left and right rear contact portions 47b are located on the base end side of the boom 30 with respect to the coupling member 45 on the upper surface of the insertion portion 41 of the connecting bracket 40 (see FIG. 3). 3 on the right side of the drawing).

  In the aerial work device 2 having such a configuration, a lower load (hereinafter referred to as a boom tip load) W due to a weight of the work table 50 or a lower load acting on the work table 50 is referred to as a tip (vertical post) of the boom 30. When acting on the support pin P) (see FIG. 5), this load W and the moment acting around the coupling member 45 by this load W can be expressed as W × L1 (= M) (distance L1 is coupled) The distance from the center O of the member 45 to the line of action of the load W, which varies depending on the hoisting angle θ of the boom 30), and the reaction force that supports the load W and moment M is as shown in FIG. The reaction force S1 (acting in a direction parallel to the load W) and S2 (acting in a direction orthogonal to S1) received by the circular hole portion 44 formed in the insertion portion 41 from the coupling member 45, and the flange portion 43 are the boom 30. Tip opening A reaction force R1 received from the lower portion 30e of the end face at 30d and a reaction force R2 received by the left and right rear contact portions 47b from the inner wall upper portion 30f of the tip opening 30d of the boom 30 are generated. Here, the magnitude of each of the reaction forces R1 and R2 is M = R1 × L2 + R2 × L3 (L2 is the distance from the center O of the coupling member 45 to the line of action of the reaction force R1, and L3 is the center O of the coupling member 45) To the action line of the reaction force R2), and the magnitudes of the reaction forces S1 and S2 are determined by the boom tip load W, the reaction forces R1 and R2, and the undulation angle θ of the boom 30. .

  Thus, in the aerial work device 2 according to the present embodiment, the connection fitting 40 that connects the work table 40 to the tip of the boom 30 is inserted into the tip opening 30d (of the tip boom 30c) of the boom 30. In addition to the portion 41, the boom 30 has a flange portion 43 that comes into contact with the lower end 30 e of the end face of the tip opening 30 d of the boom 30, and the boom tip load W acting on the connecting fitting 40 and the moment M generated thereby are coupled members. 45, the reaction forces S1 and S2 received by the circular hole 44, the reaction force R1 received by the flange 43 of the connecting fitting 40 from the lower end 30e of the end opening 30d of the boom 30, and the insertion portion 41 of the connecting fitting 40. The left and right rear contact portions 47b provided at the base end side of the boom 30 with respect to the upper surface of the coupling member 45 on the upper surface receive from the inner wall upper portion 30f of the tip opening portion 30d of the boom 30. R2 is supported by the. In such a configuration, most of the reaction force received by the connecting bracket from the bolt in the configuration in which the conventional boom and the connecting bracket are fastened by a large number of bolts, the flange portion 43 has the tip opening 30d of the boom 30. Therefore, it is not necessary to fasten the connecting member and the tip of the boom with a large number of bolts as in the prior art. Accordingly, the number of steps for drilling the bolt holes can be reduced as compared with the prior art, the processing step of the boom 30 can be simplified, and the connecting metal fitting 40 and the tip of the boom 30 are connected to the left and right sides of the boom 30. Since it is only necessary to couple these at the two locations of the part, it is easy to assemble the coupling fitting 40 to the boom 30 and the manufacturing cost can be greatly reduced as compared with the conventional case.

  In the above-described embodiment, the connecting metal fitting 40 has an opening at the tip of the boom 30 via upper contact portions (left and right front contact portions 47a and left and right rear contact portions 47b) provided on the upper surface (the upper surface of the upper portion 41a). The upper part 30d of the inner wall 30d can contact the upper part 30f of the inner wall 30d from below, but the connecting bracket 40 does not necessarily have to be able to contact the upper part 30f of the inner wall 30f of the opening 30d of the tip 30 of the boom 30. Absent. In this case, the boom tip load W acting on the connecting fitting 40 and the moment M generated around the connecting member 45 are caused by the reaction forces S1 and S2 that the circular hole 44 of the insertion portion 41 receives from the connecting member 45 and the connecting fitting 45. 40 of the flange portions 43 are supported only by the reaction force R1 received from the lower end 30e of the end face of the tip opening 30d of the boom 30 (the reaction force R1 is determined so as to satisfy R1 = M / L2). . However, as in the above-described embodiment, the inner wall of the opening of the distal end portion of the boom 30 via the upper contact portions (the left and right front contact portions 47a and the left and right rear contact portions 47b) provided on the upper surface of the connecting metal fitting 40. If it is configured to be able to come into contact with the upper portion 30f, it acts on the lower portion 30e of the end face at the tip opening of the boom 30 as compared with the case where all of the moment M acting on the connecting fitting 40 is supported by the reaction force R1. Therefore, it is possible to reduce the possibility that the tip of the boom 30 is buckled and deformed, and to reduce the weight and strength of the boom 30 (in the case of this embodiment, The reaction force S1 increases by an amount commensurate with the magnitude of the reaction force R2, but the increment can be reduced by increasing the distance L3).

  As shown in FIG. 3, in the above-described embodiment, the end face of the tip opening 30d of the tip boom 30c is formed so as to be substantially perpendicular to the extending direction of the tip boom 30c. The force (reaction force R1 in FIG. 5) acting on the contact portion between the collar portion 43 of the forehead 40 and the lower end 30e of the end face at the tip opening 30d is substantially coincident with the extending direction of the tip boom 30c. 6, the end surface of the tip opening 30d is formed so that the end face of the boom 30 faces slightly upward in the horizontal position of the boom 30, and the contact portion between the flange portion 43 of the coupling metal 40 and the lower portion 30e of the end surface of the tip opening 30d is formed. The acting force may not coincide with the extending direction of the tip boom 30c. With such a configuration, the force (contact surface pressure) acting on the lower end 30e of the end face in the tip opening 30d of the tip boom 30c can be reduced, and the risk of buckling of the tip of the boom 30 is reduced. can do.

  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 boom 30 and the connecting bracket 40 are configured to be coupled by the coupling members provided one by one on the left and right sides of the tip boom 30. Further, it may be coupled by one coupling member that penetrates the left and right of the tip boom 30. Further, in the above-described embodiment, the boom working machine according to the present invention has been described as an aerial work device configured by including a work table at the tip of the boom, but this is an example, and the tip of the boom A crane device or the like that is provided with a suspension device may be used.

It is a disassembled perspective view which shows the coupling | bonding state of the boom and connecting bracket in the aerial work vehicle provided with the boom working machine which concerns on one Embodiment of this invention. It is a side view of the aerial work vehicle. It is an enlarged side view of the tip part of the boom in the aerial work vehicle. FIG. 4 is a cross-sectional view of the boom and the coupling metal seen from the arrow IV-IV in FIG. It is an action figure of reaction force in the state where a boom tip part load is acting on a connecting metal fitting. It is an enlarged side view of the front-end | tip part of a boom which shows the example which formed so that the end surface in the front-end | tip opening part of a boom may face a little upwards in the horizontal attitude | position of a boom.

Explanation of symbols

1 High-altitude work vehicle 2 High-altitude work equipment (boom work machine)
DESCRIPTION OF SYMBOLS 30 Boom 30d Boom front end opening 30e Lower end face of boom front end opening 30f Upper inner wall of boom front end opening 40 Connecting bracket 41 Insertion part 41a Upper part of insertion part 42 Vertical post support part 43 Gutter part (lower contact part) )
45 coupling member 47a front contact part (upper contact part)
47b Rear contact part (upper contact part)
50 work table (work equipment)
B bolt

Claims (2)

In a boom working machine configured with a working device at the tip of the boom,
The working device is connected to the tip of the boom via a connection fitting attached to the tip of the boom,
The connecting fitting has an insertion portion inserted into the tip opening portion of the boom and a lower contact portion that comes into contact with a lower portion of an end surface of the tip opening portion of the boom,
The boom working machine according to claim 1, wherein the insertion portion of the connection fitting and the tip end portion of the boom are pivotally connected by a connecting member extending in a left-right direction of the boom. It has an upper contact part which can contact the upper part of the inner wall of the tip opening part of the boom in the position of the base end side of the boom from the connecting member in the upper surface of the insertion part of the connecting metal fitting. The boom working machine according to claim 1.

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