JP2003336285A - Frame of revolving superstructure for construction equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate mounting of a bed frame of a revolving superstructure on a center frame of the same. <P>SOLUTION: The bed frame 40 consists of first and second longitudinal beams 41, 42, and first to fifth-transverse beams 43 to 47 arranged across the first and second longitudinal beams 41, 42, wherein both edges of each of the first to fifth transverse beams 43 to 47 are welded to the first and second longitudinal beams 41, 42, to thereby form a closed structure of the bed frame 40 as a whole. The bed frame 40 in a preassembled state is mounted on a frame lower plate 31 of the center frame 30, and then a bottom surface 42b of the second longitudinal beam 42, bottom plates 44a, 45a, of the second and third transverse beams 44, 45, and bottom surfaces 46a, 47a of the fourth and fifth transverse beams 46, 47 are welded to the frame lower plate 31, but the second longitudinal beam 42 is not welded to a frame longitudinal plate 32. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a structure of an upper revolving body frame in a construction machine such as a hydraulic shovel, and more particularly, to a cabin as an operator cab installed in the upper revolving body. The present invention relates to improvement of a bed frame to be installed. 2. Description of the Related Art As an example of a construction machine, a hydraulic excavator generally has a configuration shown in FIG. In the figure, 1 is a lower traveling body, 2 is an upper revolving superstructure, 3 is an excavating work means provided on the upper revolving superstructure 2, 4 is a cabin provided for an operator to operate and operate a hydraulic shovel,
5 is a counter weight. In the construction machines other than the hydraulic excavator, other working means such as a crane are provided instead of the excavating work means. FIG. 9 shows an upper revolving structure 2 of a hydraulic excavator.
1 shows a frame structure of the present invention. As is clear from the figure, a center frame 10 is provided at the center, and bed frames 11 and 12 are provided on the left and right sides of the center frame, respectively. The center frame 10 includes a frame lower plate 13,
The frame lower plate 13 is erected, and comprises a frame vertical plate 14 extending over the entire length at a predetermined interval from the front and rear with a predetermined interval therebetween, and a rear end portion projecting rearward by a predetermined length. The excavation work means 3 includes the frame vertical plates 14, 1.
4 and a counter weight 5 is provided at the rear end of the frame vertical plates 14, 14. Further, one side of both bed frames 11 and 12 is a first bed frame 11 on which the cab 4 is installed, and the other side is a second bed frame 12 on which the tanks 6 and the like are installed. A building 7 including an engine room is provided at a position behind the cabin 4, the excavating work means 3 and the tanks 6, and at a position in front of the counterweight 5. FIG. 10 shows a structure of a connecting portion of the first bed frame 11 on which the cab 4 is installed to the center frame 10. As is clear from this figure, the first bed frame 11 has a vertical beam 15, and a plurality of horizontal beams are connected to the vertical beam 15. Of the lateral beams, the first lateral beam 16 located on the most distal side is L
This is an L-shaped beam formed in the shape of a letter, and second and third horizontal beams 17 and 18 are provided behind the first horizontal beam 16. The vertical beam 15 and the first to third horizontal beams 16 to 18 are box-shaped, and the cab 4
Are installed on the first to third transverse beams 16 to 18. The fourth and fifth transverse beams 1 are located behind the third transverse beam 18.
A battery and the like are mounted on the fourth and fifth horizontal beams 19 and 20. Since these are not very heavy, they are constituted by L-shaped plates. Is done. The first to fifth horizontal beams 16 to 20
Has one end fixed to the vertical beam 15 by welding means, and the other end of the L-shaped first horizontal beam 16 is
The other ends of the second to fifth horizontal beams 17 to 20 are fixed to the frame vertical plate 14 by welding means and are also welded to the frame lower plate 13. ing. That is, the first to fifth horizontal beams 16 to 20 are welded to the vertical beam 15 in advance and the first bed frame 11
The first bed frame 11 pre-assembled in this manner is mounted on the frame lower plate 13 and connected to the center frame 10 by welding to the above-described welds. [0006] Incidentally, the bed frame has a horizontal beam with respect to the vertical beam, especially the first and second horizontal beams having an independent frame shape. The transverse beam is completely cantilevered.
Therefore, if the bed frame is lifted to place the pre-assembled bed frame on the center frame, or the like, the horizontal beam at the free end may oscillate around the connection point to the vertical beam. Distortion and the like will occur. For this reason, unless the work of installing the bed frame on the center frame is carefully performed, there is an inconvenience that a large stress is generated in the welded portion of the lateral beam and the beam is damaged. Also, after being installed on the center frame,
It is necessary to adjust the position of each lateral beam, and it is extremely troublesome to accurately position all the lateral beams, and there is a problem that the number of work steps increases. [0007] Each lateral beam constituting the bed frame is:
Their lower surfaces are welded to the frame lower plate, but their free ends are also welded to the frame longitudinal plate. As a result, the bed frame is firmly fixed to the center frame. By the way, when the vehicle moves backward or the upper turning body is turned, the counterweight may collide with obstacles such as rocks, structures, and trees. As described above, when the counterweight collides with an obstacle, a high stress acts in a shearing direction on a welded portion of the horizontal beam forming the bed frame to the frame vertical plate, so that a crack or the like may be generated. The present invention has been made in view of the above points, and an object of the present invention is to make it possible to easily attach a bed frame to a center frame. [0009] In order to achieve the above-mentioned object, the present invention relates to a method for manufacturing a vehicle, comprising: an upper revolving body rotatably provided on a lower traveling body; An upper turning part of a construction machine having a center frame including a standing frame, a work frame connected to one end side, a frame vertical plate on which a counterweight is installed on the other end side, and a bed frame on which a cabin is installed. The body frame, wherein the bed frame is composed of a vertical beam made of a hollow member, and a plurality of horizontal beams provided in connection with the vertical beam, and at a position separated from the vertical beam by a predetermined distance. A bridge member for connecting the front and rear transverse beams is provided, and the bed frame is fixed to the frame lower plate by welding means. One end is connected to a vertical beam, and a cross-linking member is bridged between a plurality of horizontal beams arranged in the front-rear direction, whereby the horizontal beam has a closed structure. As a result, when assembling the bed frame and installing it on the center frame,
There is no risk of runout or distortion. Therefore, the positioning of the bed frame on the center frame can be performed extremely easily. The bridging member is bridged between the front and rear horizontal beams arranged in the front-rear direction with respect to the vertical frame. In addition, when the bed frame is transported or installed on the center frame, each cross beam is used. Is to stabilize the position of. For this reason, since the bridge member does not necessarily have to exhibit the function of receiving the load of the cabin as a structural member of the upper swing body, it can be formed of a relatively thin steel plate or a bar steel. A plurality of bridging members can be provided so as to sequentially bridge between the cross beams located in front and rear, and each cross beam can be connected to one bridging member. Further, the mounting position of the bridging member may be provided at the free end of the horizontal beam or in the vicinity thereof. The bridging member can be composed of another longitudinal beam consisting of a hollow member, and the other longitudinal beam is welded to the ends of each transverse beam so that both ends of each transverse beam are connected to both longitudinal beams. Most desirably, it is configured to be fixed to the side surface. The bed frame having the above structure is fixed to the center frame by welding means. This bed frame is fixed by welding at least to the frame lower plate of the center frame, but it is desirable not to weld it to the frame vertical plate which becomes a high stress portion. If the bridging member is formed of another vertical beam, and the other vertical beam is also welded to the frame lower plate, the welding strength can be increased, and there is no need to weld to the frame vertical plate. As a result, even if the counterweight collides with an obstacle, a large impact does not act on the bed frame, and no extreme stress acts on the welded portion, thereby improving the durability of the welded portion. Embodiments of the present invention will be described below with reference to the drawings. 1 shows a state where the bed frame is separated from the center frame, and FIG. 2 shows a state where the bed frame is installed on the center frame and fixed by welding. In these drawings, another bed frame is installed on the opposite side of the center frame, but illustration of the other bed frame is omitted. In these figures, reference numeral 30 denotes a center frame, and the center frame 30 is a frame lower plate 31.
And a pair of frame vertical plates 32 erected at the approximate center of the frame lower plate 31 in the front-rear direction. The frame vertical plates 32 are fixed to the frame lower plate 31 by welding means at positions separated by a predetermined interval. A reinforcing plate 33 is stretched between the frame vertical plates 32, 32 at a substantially intermediate position, and a mounting plate 34 also serving as a reinforcing plate is formed at a front position.
A pair of flanges 35 is attached to the mounting plate 34, and a base end of a boom (not shown) constituting the excavation work means is raised between the flanges 35 and a front end of the frame vertical plate 32. It will be operably linked.
Further, a swivel wheel 36 is attached to the lower surface side of the frame lower plate 31, and the upper swing body is pivotally connected to the lower traveling body via the swing wheel 36. Numeral 40 denotes a bed frame, which comprises first and second vertical beams 41 and 42,
The first and second vertical beams 41 and 42
-5 horizontal beams 43-47. here,
The second longitudinal beam 42 constitutes a bridging member,
The other ends of the first to fifth horizontal beams 43 to 47 each having one end connected to the first vertical beam 41 are connected by welding means,
The bed frame 40 as a whole has a closed structure.
The portion where the first to third lateral beams 43 to 45 are provided is a cabin installation portion, and the fourth and fifth lateral beams 46 and 47 located behind the cabin are located behind the cabin. , For example, where a battery or the like is installed. The first vertical beam 41 is located on the side of the hydraulic excavator, and has a cross-sectional shape formed of a substantially D-shaped hollow member as shown in FIG. Has a vertical surface 41a. Further, as shown in FIG. 4, the second vertical beam 42 is formed of a hollow member having a quadrangular cross section, and a vertical surface 42 a is formed on a side of the first vertical beam 41 facing the vertical surface 41 a. And the bottom surface 42b is a flat surface. on the other hand,
The first lateral beam 43 is formed of a hollow member having a substantially rectangular cross section shown in FIG. 5, and the upper surface 43a has a planar shape and projects rearward. As shown in FIG. 6, the second and third lateral beams 44 and 45 are
a, 45a, and the upper surfaces 44b, 45b are flat. The width of the second lateral beam 44 and the width of the third lateral beam 45 are slightly different. Further, as shown in FIG. 7, the fourth and fifth horizontal beams 46 and 47 are L-shaped, and the bottom surfaces 46a and 47a are flat. Further, two through holes 48 for mounting a vibration isolator provided in the cabin are formed on the upper surface of the first lateral beam 43 and the third lateral beam 45, respectively. The bed frame 4 having the above-described structure is used.
0 is an example thereof. In short, as a bed frame, at least, two vertical beams extending in the front-rear direction, and two vertical beams provided between these two vertical beams and provided with a cabin are provided. It is only necessary to have a horizontal beam and another horizontal beam provided so as to bridge the rear end of the vertical beam, and the number of horizontal beams can be further increased. Further, the fourth and fifth lateral beams can also be formed by hollow members. Also, the upper surface 43 of the first transverse beam 43
a, the upper surfaces 44b, 4 of the second and third transverse beams 44, 45
The reason why 5b has a planar shape is to install a cabin. The bed frame 40 is set on the frame lower plate 31 of the center frame 30 in a pre-assembled state. To pre-assemble the bed frame 40, both ends of the first to fifth horizontal beams 43 to 47 are connected to the vertical surface 41a of the first vertical beam 41 and the vertical surface 42a of the second vertical beam 42. It is performed by fixing by welding. Thus, the entire bed frame 40 has a closed structure, and does not warp or bend when being transported or installed on the frame lower plate 31 of the center frame 30. The bed frame 40 installed on the frame lower plate 31 is positioned at a predetermined position and fixed by welding. Therefore, when the bed frame 40 is installed on the frame lower plate 31, the shape of the bed frame 40 is not distorted or distorted, so that the installation operation and the positioning operation on the frame lower plate 31 can be performed extremely easily. Further, no unreasonable load acts on each of the above-mentioned welding portions in the bed frame 40. When the bed frame 40 is installed on the frame lower plate 31, the bottom surface 42b of the second vertical beam 42 and the bottom plates 44a and 45a of the second and third horizontal beams 44 and 45 are provided.
And bottom surfaces 46a, 4 of the fourth and fifth lateral beams 46, 47.
7a is partially in contact with the frame lower plate 31. Therefore, the bed frame 40 is fixed to the frame lower plate 31 by welding these contact portions. Here, the second vertical beam 42 faces the frame vertical plate 32. However, even if the second vertical beam 42 is brought into a non-contact state with the frame vertical plate 32 or is brought into contact with the frame vertical plate 32, No welding is performed between the second vertical beam 42 and the frame vertical plate 32. Here, when a gap between the second vertical beam 42 and the frame vertical plate 32 is configured to be sufficiently obtained, welding is performed between the second vertical beam 42 and the frame lower plate 31 through the gap. However, if a sufficient gap cannot be obtained, the frame lower plate 3 of the second vertical beam 42
1 is a vertical surface 42a of the bottom surface 42b.
And only the side connected to the other side is not welded. The bed frame 40 is welded only to the frame lower plate 31 and is not welded to the frame vertical plate 32. The welding location includes not only the horizontal beams 44 to 47 but also the second vertical beam 42. Therefore, the number of welding points increases by that much, and the center frame 30 of the bed frame 40
The bonding strength to the substrate can be sufficiently increased. For this reason, welding to the frame vertical plate 32 is not required. In order to secure a weld between the rear end of the second vertical beam 42 and the fourth and fifth horizontal beams 46 and 47, the rear end of the frame lower plate 31 projects outward from the opposite side. Let me. As described above, when the bed frame 40 is fixed to the center frame 30, a sufficient fixing strength is obtained by welding to the frame lower plate 31, and the bed frame 40 is not fixed to the frame vertical plate 32. When the vehicle is moved backward or the upper revolving structure is turned, even if the counterweight constituting the rear end of the upper revolving structure collides with an obstacle such as a rock, a structure or a tree, it acts on the bed frame 40. Impact can be reduced. The counterweight is fixed to two frame vertical plates 32, and the frame vertical plate 32 is provided in a direction orthogonal to the frame lower plate 31. When the counterweight collides with an obstacle, a force in a direction indicated by an arrow in FIG. 2 acts on the frame vertical plate 32, but the force is a horizontal force, and a vertical force acts. Therefore, the transmission of the impact from the frame vertical plate 32 to the frame lower plate 31 is minimized. Therefore, substantially no impact load acts on the bed frame 40 fixed to the frame lower plate 31, and no high stress acts on the welded portion of the bed frame 40 to the frame lower plate 31. . In addition, a cabin on which the operator rides is installed in the bed frame 40, but it is possible to suppress an impact from being applied to the cabin when the counterweight collides with an obstacle. The present invention is constructed as described above, and has effects such as easy attachment of the bed frame to the center frame.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a center frame and a bed frame separately according to an embodiment of the present invention. FIG. 2 is a plan view showing a state where the bed frame of FIG. 1 is installed and fixed on a center frame. FIG. 3 is a longitudinal sectional view of a first longitudinal beam. FIG. 4 is a longitudinal sectional view of a second longitudinal beam. FIG. 5 is a longitudinal sectional view of a first horizontal beam. FIG. 6 is a longitudinal sectional view of second and third horizontal beams. FIG. 7 is a vertical sectional view of fourth and fifth horizontal beams. FIG. 8 is an overall configuration diagram of a hydraulic excavator. FIG. 9 is an external perspective view showing a frame structure of an upper swing body 2 of the conventional hydraulic shovel. FIG. 10 is a plan view showing a connection structure between a bed frame and a center frame in the frame structure of FIG. 9; DESCRIPTION OF SYMBOLS 30 Center frame 31 Frame lower plate 32 Frame vertical plate 40 Bed frame 41 First vertical beam 42 Second vertical beam 43 First horizontal beam 44 Second horizontal beam 45 Third horizontal beam 46 Fourth lateral beam 47 Fifth lateral beam

Claims (1)

Claims: 1. An upper revolving body rotatably provided on a lower traveling body is provided on a frame lower plate, and is erected on the frame lower plate. On the other end side, a center frame including a frame vertical plate on which a counterweight is installed, and a bed frame on which a cabin is installed, in an upper revolving structure frame of a construction machine, wherein the bed frame is made of a hollow member. Beam and
A plurality of horizontal beams provided in connection with the vertical beam, and a bridge member for connecting the front and rear horizontal beams is provided at a position separated from the vertical beam by a predetermined distance; An upper revolving structure frame for a construction machine, wherein the upper revolving structure frame is fixed to the lower frame plate by welding means. 2. The cross-linking member is constituted by another vertical beam made of a hollow member, and both ends of each of the horizontal beams are fixed by welding to side surfaces of the two vertical beams. The upper revolving unit frame of a construction machine according to claim 1, wherein