JP4390202B2 - Catwalk for construction machinery - Google Patents

Description

  The present invention belongs to the technical field of catwalks in construction machines such as hydraulic excavators.

In general, there is a machine body of a construction machine provided with a catwalk as a scaffold for work when performing maintenance work of an engine room, for example, but a conventional catwalk has a plate material that serves as a scaffold, In some cases, a plurality of support members in the form of beam plates are arranged on the lower surface of the plate member and attached to the machine body in a supported state (see, for example, Patent Document 1). However, since the bottom surface of the plate and the support material are exposed as they are, when this is used in a forest, tree branches, grass, etc. vegetated in the forest are pinched or stabbed by these, Not only is the maintenance work to remove this troublesome and cumbersome, but there is also a problem that the catwalk is deformed early.
Japanese Utility Model Publication No. 5-32451

Therefore, in such forest work, it is advisable to cover the bottom of the plate and the support member with a cover so that the bottom is not exposed and to form a sealed structure, and to increase the strength by increasing the plate thickness of the support. Is done.
However, when trying to increase the strength by increasing the thickness of the support material in this way, the catwalk becomes heavy and not only difficult to handle, but also has a problem that it is forced to attach firmly to the body of the aircraft. Arise.
Furthermore, since the support material is covered with a cover, the sealed catwalk cannot be fixed to the main body by bolts, and therefore cannot be stopped without being attached to the main body by welding. The bolts had to be fixed through the mounting members exposed to the outside. However, with the former, there is a problem that it is difficult to perform maintenance such as exchanging the catwalk, and with the latter, there is a further problem that a tree branch or the like is caught between the mounting member and the bolt exposed to the outside. Here, there is a problem to be solved by the present invention.

The present invention, which was created for the purpose of solving these problems in view of the such circumstances above, the invention of claim 1, the cat walk as a scaffolding construction machine machine body, pipes When the frame is formed with the mounting plate and covered with a cover, the mounting plate is applied from the outside in the horizontal direction to the mounting side fixed to the side frame of the fuselage body and inserted from the outside in the horizontal direction. The pipe is fixed between the front and rear legs projecting outward in the left and right direction with the base end fixed to the front and rear upper ends of the mounting plate and the left and right outer ends of the front and rear legs. A main pipe that is substantially U-shaped with the middle part, a linear upper reinforcing pipe provided between the upper end part of the mounting plate and the middle part of the main pipe, and a base end part at the lower end part of the mounting plate Fixation The lower end of the main pipe is inclined so as to be located at the upper side, and the lower end of the main pipe is bent upward and the lower reinforcement pipe is fixed to the middle of the main pipe. The cover is composed of a top plate that covers the frame from the upper side, a bottom plate that covers the frame from the lower side and the left and right sides, and a front and rear side plate that covers the frames from the front and rear sides. A catwalk for a construction machine, wherein the bolt for fixing the plate is configured not to be exposed to the outside .

With the invention of claim 1, Ru can ensure sufficient strength while reducing the weight of the cat walk.

  Next, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a hydraulic excavator, and the hydraulic excavator 1 includes a crawler type lower traveling body 2, an upper revolving body 3 supported on the lower traveling body 2 through a swivel device so as to be rotatable. Yes. Further, the upper swing body 3 is configured by providing various member devices such as the driver's cockpit 5 and the engine room 6 covering the engine mounted on the swing body frame 4 constituting the bottom surface. It is.

The swivel frame 4 is formed in a rectangular shape by welding members such as a frame material and a plate material set to have an appropriate shape, size, and length. A pair of left and right upright frames 7 is provided at the center, and the upright frame 7 has a tall tower portion 7a for supporting a boom 8 as a front attachment formed at the front, and With the tower portion 7a as a top, the upper end edge is inclined so as to be lower toward the rear side so as to become lower toward the rear side. Side frames 9 are provided on both left and right sides of the upright frame 7, and both left and right sides of the side frame 9 are the left and right side surfaces of the revolving body frame 4. Side frames 9 are provided on both left and right sides of the frame 7a, and mounting brackets 10 are fixed to the left and right side surfaces 4a of the side frame 9 by welding or the like with appropriate intervals in the front-rear direction. The mounting bracket 10 is provided with a mounting side 10a protruding from the revolving body frame side surface 4a. The mounting side 10a has a hole 10b opened for assembling a catwalk 11 described later, and anchored nut 10 c is provided on the side surface.

The catwalk 11 is composed of a frame 12 and a cover 13 covering the frame 12, and a mounting plate 12a that is long in the front-rear direction constituting the frame 12 is applied to the mounting side 10a from the outside in the left-right direction . As is clear from FIG. 4, it is fixed by a bolt 14 inserted from the outside in the left-right direction , whereby the catwalk 11 is attached. Further, a cover attachment piece 12b that is bent outward in the left-right direction is formed at the upper edge of the attachment plate 12a , and an attachment hole 12c is formed in the cover attachment piece 12b with an appropriate interval in the front-rear direction. The nut 15 is fixed to the lower surface thereof.

On the other hand, in the present embodiment, the pipes constituting the skeleton 12 are composed of a cylindrical hollow main pipe 12d having a large diameter and upper and lower reinforcing pipes 12e and 12f having a hollow cylindrical shape and a smaller diameter than the main pipe 12d. However, the main pipe 12d is substantially U-shaped with both the front and rear leg portions 12g and the intermediate portion 12h between the left and right outer ends of the leg portions 12g (obviously apparent from FIG. 3) . The main pipe 12d is configured such that the intermediate portion 12h protrudes outward in the left-right direction by fixing the base ends of the front and rear legs 12g to the front and rear upper ends of the mounting plate 12a. . Further, between the mounting plate 12a and the main pipe intermediate portion 12h, the upper and lower reinforcing pipes 12e and 12f are respectively provided in a cross-linked manner at two front and rear positions (which can be increased or decreased if necessary) located between the main pipe leg portions 12g. ing. The upper reinforcing pipe 12e is provided in a straight line between the upper end portion of the mounting plate 12a and the main pipe intermediate portion 12hd, and the lower reinforcing pipe 12f is inclined so as to be positioned higher toward the outer side in the left-right direction. The base end is fixed to the lower end portion of the mounting plate 12a, is bent upward at the lower position of the main pipe 12d, and the distal end is fixed to the main pipe intermediate portion 12h.

  On the other hand, the cover 13 includes a top plate 13a, a bottom plate 13b, and front and rear side plates 13c. The bottom plate 13b is formed in a shape along the lower edge of the lower reinforcing pipe 12f, and is fixed in a state where the base end is abutted against the mounting plate 12a. Furthermore, the lower reinforcing pipe 12f and the middle of the main pipe It is fixed to the part 12h. The front and rear side plates 13c are shaped along the bottom plate 13b, the mounting plate 12a, and the main pipe leg portion 12g, and slightly protrude in the front-rear direction from the front and rear leg portions 12g of the main plate on the mounting plate 12a and the bottom plate 13b. The catwalk 11 is a semi-finished product 16 that is sealed at the front and rear sides, the lower side, and the left and right sides, and opened upward. A mounting bracket 18 to which a nut 17 is fixed is fixed to the main pipe intermediate portion 12h.

On the other hand, the top plate 13a is composed of a rectangular plate material, and as shown in FIG. 3, covers the frame 12 from above, but the upper plate portion 12b of the mounting plate 12a covers the cover mounting piece portion 12b. Through holes 13d and 13e are opened corresponding to the nut 15 provided and the nut 17 provided on the mounting bracket 18, and are attached to the semi-finished product 16 via the mounting bolts 19 that pass through the through holes 13d and 13e. The opening is closed so that a sealed catwalk 11 is formed. The through-hole 13e on the mounting bracket 18 side has a size that allows the bolt head 19a to be loosely fitted, and a bolt receiver in which a through-hole 20a through which a bolt screw portion passes is formed in the lower surface of the through-hole 13e. A plate 20 is provided.

  In the embodiment of the present invention configured as described above, the catwalk 11 is attached to the body body by providing the side plate 4a of the body revolving body frame 4 with the mounting plate 12a of the semi-finished product 16 assembled in advance. After attaching to the mounting bracket 10 via the bolts 14, the mounting bolts 19 that have passed through the through holes 13 d and 13 e of the top plate 13 a are provided with nuts 15 provided on the upper piece 12 b of the mounting plate 12 a and the cover attaching piece 12 b Since the top board 13a is attached to the semi-finished product 16 by screwing onto the nut 17 provided on the mounting bracket 18, the cat walk 11 can be attached to the body body. Furthermore, since the catwalk 11 is attached to the main body through the bolts 14 inside the catwalk 11, the bolts 14 are not exposed to the outside after the attachment, and a tree branch or the like is sandwiched between the bolts 14. Can be prevented.

In addition, the cat walk 11 is composed of a cylindrical hollow main pipe 12d and upper and lower reinforcing auxiliary pipes 12e and 12f, so that the weight of the cat walk 11 can be reduced as compared with the conventional cat walk 11. The structure can be strengthened. Further, the catwalk 11 is attached to the main body by attaching the mounting bracket 10 provided on the main body and the mounting plate 12a via the bolts 14, and the catwalk 11 of the present embodiment is more conventional than the conventional one. Since the weight is reduced, the number of bolts to be attached to the main body can be reduced, and the attachment and removal of the cat walk 11 including the maintenance can be facilitated.
Further, since the cat walk 11 is configured to cover the outer surface with the cover 13 in a hermetically sealed manner, it is possible to prevent a tree branch or the like from being caught in the cat walk 11.

  The catwalk 11 is attached to the machine body in the state of the semi-finished product 16 from which the top board 13a is removed, and then the top board 13a is screwed through the attachment bolts 19 to become a finished product and attached to the machine body. Therefore, not only is the body attachment part hidden inside and not exposed to the outside, but the attachment bolt 19 for attaching the top plate 13a is located on the upper surface of the catwalk 11, and the bottom plate 13b is attached later. As a result, when it is used for forest work, it is possible to reduce that the vegetation is caught on the catwalk 11 during the work.

Needless to say, the present invention is not limited to the above-described embodiment, and can be implemented, for example, in the second embodiment shown in FIG. In this configuration, the same reference numerals are assigned to the same components as those in the first embodiment, and the detailed description thereof is omitted.
The cat walk 21 according to the second embodiment includes a skeleton 22 and a cover 23 corresponding to the skeleton 12 and the cover 13 according to the first embodiment. Here, the attachment plate 22a constituting the framework 22 corresponds to the attachment plate 12a of the first embodiment, but the upper piece 12d cover attachment piece 22b on the upper side of the attachment plate 212a is also provided on the lower side. The configuration is the same as that of the first embodiment except that it is different from the mounting plate 12a of the first embodiment. Further, the main pipe 22c and the upper and lower reinforcing pipes 22d and 22e constituting the skeleton 22 have the same configuration as that of the first embodiment. Further, the cover 23 is made of an integrally formed plate material, and is formed so as to be a sealed catwalk 21 so as to cover the frame 22.

  In the present embodiment configured as described above, the catwalk 21 is attached to the body body by first attaching the mounting plate portion 22a of the assembled frame 22 to the mounting bracket 10 attached to the side surface of the body via bolts 14. By attaching, the frame 22 is attached to the main body, and then the cover 23 integrally formed with the frame 22 is fitted, and the upper and lower ends of the cover 23 on the main body side are bolted to the cover attaching piece 22b of the frame 22. Therefore, the catwalk 11 can be easily attached to and detached from the main body. Furthermore, since the cover 23 is integrally formed, the weight of the catwalk 11 can be reduced, the strength can be increased, and the fuselage body mounting portion is not exposed to the outside. The same effect as that of No. will be produced.

It is a side view of a hydraulic excavator. It is a perspective view which shows the assembly | attachment to the turning body frame of a turning body frame and a catwalk. It is a disassembled perspective view of a catwalk. It is sectional drawing of a cat walk. It is a disassembled perspective view of the catwalk of 2nd embodiment.

Explanation of symbols

11 Catwalk 12 Frame 12a Mounting Plate 12d Main Pipe 12e Upper Reinforcement Pipe 12f Lower Reinforcement Pipe 13 Cover 13a Top Plate 14 Bolt 16 Semi-finished Product 21 Catwalk 22 Frame 23 Cover

Claims (1)

Install the cat walk as a scaffolding construction machine machine body, to form a framework between the pipes and the mounting plate, in configuring covered with cover bone assembly, wherein the mounting plate is fixed to the side frame of the machine body It is a plate material that is applied to the side from the outside in the left-right direction and fixed by bolts inserted from the outside in the left-right direction, and the pipe has a proximal end fixed to the front and rear upper ends of the mounting plate and protrudes outward in the left-right direction A main pipe that is substantially U-shaped between the front and rear legs and the middle part between the left and right outer ends of the front and rear legs, and a straight line provided between the upper end of the mounting plate and the middle of the main pipe The upper reinforcement pipe and the base end are fixed to the lower end of the mounting plate and tilted so that the outer side in the left-right direction is located upward, and the tip bent upward at the lower position of the main pipe is the main pipe Middle The cover is composed of a top plate that covers the frame from the upper side, a bottom plate that covers the frame from the lower side and the left and right sides, and a front and rear side plate that covers the front and rear sides. A catwalk for a construction machine, characterized in that the frame for fixing the frame and the mounting plate protruding outward in the left-right direction from the side frame is not exposed to the outside .

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