JP2012149447A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction machine capable of preventing a weld part between a column and a leg portion of a canopy from having high stress.SOLUTION: Right and left leg portions 24 and 25 which fix right and left columns 26 and 27 are formed of half cylindrical bodies 24B and 25B each having a semi-circular inner surface. Weld parts 30 are vertically arranged from top to bottom, between the respective edge parts 24B2 and 24B3 adjacent to the opening of the half cylindrical body 24B and the outer peripheral surface of the left column 26, and between the respective edge parts 25B2 and 25B3 adjacent to the opening of the half cylindrical body 25B and the outer peripheral surface of the right column 27, such that the both parts are fixed to each other. A uniform thickness of the weld part 30 is thereby achieved from top to bottom, preventing the weld part 30 from having high stress.

Description

  The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to a construction machine provided with a canopy that covers an operator sitting on a driver's seat.

  Generally, a hydraulic excavator is known as a typical model of a construction machine having a canopy. This hydraulic excavator is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and an up-and-down movement that can be moved up and down on the front side of the upper revolving body. It is roughly constituted by a working device.

  Here, the upper swing body includes a frame on which a work device is mounted on the front side as a support structure, a driver seat provided on the frame on which an operator is seated, and the work device provided on the rear side of the frame. The weight of the counterweight and a canopy provided so as to cover the upper side of the driver's seat are roughly constituted.

  Here, the canopy of the hydraulic excavator includes, for example, left and right leg portions provided on the rear side of the driver's seat, and left and right leg portions that are attached by fitting the fitting portions of the leg portions on the lower side and extending upward. It is comprised by the support | pillar and the roof provided in the upper part of each support | pillar so that the upper part of a driver's seat may be covered (for example, refer patent document 1).

  Further, as a canopy for a hydraulic excavator, there is also known a configuration in which left and right struts are fitted and attached to a mounting seat plate formed by connecting left and right legs (for example, Patent Document 2). reference).

JP 2007-297841 A JP 2005-350905 A

  The canopy according to the prior art is configured such that the lower end portion of a cylindrical column is fitted into a cylindrical fitting portion provided on the leg portion, and the entire circumference is welded between the lower end portion and the fitting portion of these columns. Thus, the support and the leg are fixed. In this case, the change in the cross section of the weld formed by all-around welding becomes large (the weld becomes a sudden change in the cross section), and the stress based on the load applied from the canopy may increase (stress concentration) in the weld. is there.

  The present invention has been made in view of the above-described problems of the prior art, and provides a construction machine capable of suppressing an increase in stress (stress concentration) in a welded portion between a support column and a leg portion constituting a canopy. It is aimed.

  In order to solve the above-described problems, the present invention provides a frame on which a working device and an engine are mounted as a support structure, a driver seat provided on the frame and seated by an operator, and a pedestal member on the frame side. A canopy covering the upper side of the driver seat, the canopy being located on the rear side of the driver seat and attached to the pedestal member, and a lower side attached to each leg portion, respectively. Thus, the present invention is applied to a construction machine including left and right support columns to which a roof extending upward and covering an upper side of the driver's seat is attached.

  A feature of the configuration adopted by the invention of claim 1 is that each leg is formed by a half cylinder having a semicircular arc-shaped inner surface, and each of the half cylinders forming each leg is formed. The outer peripheral surface of each column is fixed to the opening edge by welding upward and downward.

  According to a second aspect of the present invention, there is provided a connecting plate for connecting the leg portions between the leg portions constituting the canopy, and the canopy is attached to the pedestal member via the connecting plate; It is to have done.

  According to a third aspect of the present invention, the leg is provided with a reinforcing rib extending along the upper surface of the connecting plate.

  According to a fourth aspect of the present invention, the pedestal member on the frame side is provided on the frame across a counterweight provided on the rear side of the frame or the engine in order to balance the weight with the work device. The structure is a support frame.

  According to the first aspect of the present invention, the left and right leg portions are formed of a half cylinder having a semicircular arc-shaped inner surface. Therefore, the respective struts are brought into surface contact with each leg portion in the upward and downward directions. It can be fixed in the state. Moreover, since the outer peripheral surface of each column is fixed to the edge of each leg by welding up and down, the thickness of the welded portion provided between each leg and each column is reduced. It is possible to suppress the difference from appearing in the upward and downward directions. Thereby, the change of the cross section of a welding part can be made small, and it can suppress that the stress of a welding part becomes high (stress concentration). As a result, the strength and durability of the joint portion between each leg and each column can be improved, and the stability and reliability of the construction machine can be improved.

  According to invention of Claim 2, since it has set it as the structure which connects between each leg part by a connection plate, each leg part connected by the connection plate can be integrally attached to a base member. Thereby, each leg part can be stably attached to the pedestal member, and the attachment property (easy to attach) of each leg part to the pedestal member can be improved.

  According to the invention of claim 3, since the reinforcing ribs are provided on each leg, the strength of each leg can be increased, and the durability and reliability of each leg can be improved.

  According to the invention of claim 4, since the canopy is attached to the counterweight or the support frame, the canopy can be stably attached to the counterweight or the support frame serving as the strength member.

1 is a front view showing a hydraulic excavator according to an embodiment of the present invention. It is a disassembled perspective view which shows a turning frame, a counterweight, a canopy, etc. It is a perspective view which shows a turning frame, a counterweight, a canopy, etc. It is the perspective view seen from the rear side of FIG. 3 which shows a counterweight, a canopy, etc. FIG. 4 is an enlarged perspective view of a part (V) in FIG. 3 showing left and right struts, left and right legs, connecting plates and the like. It is an expanded sectional view seen from the arrow VI-VI direction in FIG. 5 which shows a left support | pillar, a left leg part, a connection plate, etc. It is an enlarged view seen from the arrow VII-VII direction in FIG. 5 which shows a right support | pillar, a right leg part, a connection plate, etc. It is a disassembled perspective view seen from the same direction as FIG. It is sectional drawing similar to FIG. 6 which shows the left support | pillar, the left leg part, connection plate, etc. by the 1st modification of this invention. It is sectional drawing similar to FIG. 6 which shows the left support | pillar, the left leg part, a connection plate, etc. by the 2nd modification of this invention. It is a front view which shows the hydraulic shovel by the 3rd modification of this invention. It is a front view which expands and shows a turning frame, an engine, a support frame, a canopy, etc. It is a perspective view which expands and shows a support frame, a canopy, etc.

  Hereinafter, a case where the embodiment of the construction machine according to the present invention is applied to a small hydraulic excavator will be described as an example, and will be described in detail with reference to FIGS.

  In the figure, reference numeral 1 denotes a hydraulic excavator as a construction machine. The hydraulic excavator 1 includes a self-propelled crawler-type lower traveling body 2 and an upper revolving body 3 that is rotatably mounted on the lower traveling body 2. The working apparatus 4 described later is provided on the front side of the upper swing body 3 so as to be swingable and can be raised and lowered, and the earth removing device 5 is provided on the front side of the lower traveling body 2.

  Reference numeral 4 denotes a swing type working device provided on the front side of the upper swing body 3, and the working device 4 is mounted on a front end side of a swing frame 6 described later so as to be swingable left and right. 4A, a boom 4B attached to the swing post 4A so as to be able to move up and down, an arm 4C attached to the tip of the boom 4B so as to be able to move up and down, and a pivot attached to the tip of the arm 4C A bucket 4D as a working tool, and a bucket link 4E provided between the arm 4C and the bucket 4D.

  A swing cylinder (not shown) that swings the swing post 4A leftward and rightward is provided between the swing frame 6 and the swing post 4A. Between the swing post 4A and the boom 4B, A boom cylinder 4F for raising and lowering the boom 4B is provided, an arm cylinder 4G for raising and lowering the arm 4C is provided between the boom 4B and the arm 4C, and a bucket is provided between the arm 4C and the bucket link 4E. A bucket cylinder 4H that rotates 4D upward and downward is provided.

  Reference numeral 6 denotes a revolving frame as a frame that forms a support structure of the upper revolving structure 3, and the swing post 4 </ b> A of the working device 4 described above is attached to the front end side of the revolving frame 6 so as to be swingable left and right. ing. Here, as shown in FIGS. 2 and 3, the revolving frame 6 has a bottom plate 6A formed using a thick steel plate or the like, and a left plate erected on the bottom plate 6A so as to extend forward and backward. A vertical plate 6B, a right vertical plate 6C, a left side frame 6D and a right side frame 6E provided to extend forward and rearward on the left and right sides of the vertical plates 6B and 6C, and the vertical plates 6B and 6C. And a plurality of overhanging beams 6F that connect the side frames 6D and 6E, and a support bracket 6G that is provided at the front end of each of the vertical plates 6B and 6C and supports the swing post 4A.

  Reference numeral 7 denotes an engine mounted on the rear side of the revolving frame 6 (see FIG. 1). The engine 7 drives a hydraulic pump (not shown), and is arranged in a horizontally placed state extending in the left and right directions.

  Reference numeral 8 denotes a counterweight located on the rear side of the engine 7 and attached to the rear portion of the turning frame 6. The counterweight 8 balances the weight with the work device 4 and is formed as an arc-shaped heavy object whose central portions in the left and right directions protrude rearward. The counterweight 8 serves as a pedestal member on the revolving frame 6 side to which a canopy 21 described later is attached. Further, as shown in FIG. 2, three bolt holes 8B are formed on the upper surface portion 8A of the counterweight 8 so as to be separated from each other in the left and right directions. Bolts 23 for fixing 24 and 25 via the connecting plate 22 are screwed.

  A seat base 9 is provided so as to cover the upper front side of the engine 7, and a driver's seat 12 described later is mounted on the seat base 9. Reference numeral 10 denotes a floor board laid on the front side of the seat base 9, and 11 denotes an exterior cover that covers both the left and right sides of the seat base 9.

  A driver's seat 12 is mounted on a seat base 9 on the revolving frame 6, and the operator's seat 12 is seated by an operator. Further, left and right work operation levers 13 for operating the work device 4 and the like are disposed on both the left and right sides of the driver seat 12. Further, on the front side of the driver's seat 12, a traveling operation lever 14 that is located at the front portion of the floor board 10 and travels the lower traveling body 2 is disposed.

  Next, the canopy 21 attached to the upper swing body 3 will be described.

  That is, reference numeral 21 denotes a two-column canopy provided on the upper swing body 3. The canopy 21 is attached to the upper surface portion 8A of the counterweight 8 and covers the upper side of the driver's seat 12. The canopy 21 includes a connecting plate 22, left and right legs 24 and 25, which will be described later, left and right struts 26 and 27, It is comprised by the roof 29 grade | etc.,.

  Reference numeral 22 denotes a connecting plate provided between left and right leg portions 24 and 25, which will be described later. The connecting plate 22 is formed as a plate that is curved in an arc shape by a metal material such as a steel material. The parts 24 and 25 are integrally connected. For this purpose, left and right leg portions 24 and 25 are spaced apart from each other and fixed to the upper surfaces of the connecting plate 22 in the longitudinal direction by welding. Further, the connection plate 22 is provided with bolt insertion holes 22 </ b> A penetrating upward and downward at three positions corresponding to the bolt holes 8 </ b> B of the counterweight 8. Bolts 23 for fixing the canopy 21 to the upper surface portion 8A of the counterweight 8 are inserted through these bolt insertion holes 22A.

  Reference numeral 24 denotes a left leg portion that is located behind the driver seat 12 and is attached to the left side of the counterweight 8, and 25 is a right leg portion that is located behind the driver seat 12 and is attached to the right side of the counterweight 8. Yes. These left and right leg portions 24 and 25 are formed in a half-cylinder shape having a semicircular arc-shaped inner surface, and are attached to the counterweight 8 via the connecting plate 22 so as to be located on the rear side of the driver's seat 12. ing.

  Here, the left and right leg portions 24 and 25 are roughly constituted by bottom plate portions 24A and 25A, half cylinders 24B and 25B, and reinforcing ribs 24C and 25C, and these bottom plate portions 24A and 25A are divided into half portions. The cylinders 24B and 25B and the reinforcing ribs 24C and 25C are integrally formed using, for example, casting means.

  The bottom plate portions 24A and 25A serving as the bases of the left and right leg portions 24 and 25 are attached to the counterweight 8 via the connecting plate 22. For this purpose, the bottom plate portions 24 </ b> A and 25 </ b> A are fixed (fixed) to the both ends of the upper surface of the connecting plate 22 in the length direction by welding. As shown in FIG. 6, FIG. 7, etc., bolt insertion holes 24A1, 25A1 through which the bolts 23 are inserted are located at the top plate portions 24A, 25A corresponding to the bolt insertion holes 22A of the connecting plate 22. It is provided penetrating downward.

  The half cylinders 24B and 25B provided to extend upward from the bottom plate portions 24A and 25A have a shape (half shape) in which the cylindrical member is divided in the vertical direction, and the half cylinders 24B and 25B. Are fixed (adhered) to the lower ends of left and right struts 26 and 27, respectively, which will be described later. Here, the half cylinders 24B and 25B have concave surface portions 24B1 and 25B1 extending in the upward and downward directions in a state in which the cross section has an arc shape and in surface contact with the outer peripheral surface of each support column 26 and 27, and the concave surface portion 24B1. , 25B1 is positioned on one end side in the circumferential direction and extends upward and downward along the support columns 26, 27, and each support column is positioned on the other end side in the circumferential direction of the recessed surface portions 24B1, 25B1. 26 and 27, end edges 24B3 and 25B3 extending upward and downward.

  The concave surface portions 24B1 and 25B1 of the half cylinders 24B and 25B are formed in a semicircular arc shape as shown in FIGS. 6 and 8 and the like, and are arranged at one end side in the circumferential direction of the half cylinders 24B and 25B. The end edge portions 24B2 and 25B2 and the end edge portions 24B3 and 25B3 on the other end side in the circumferential direction are arranged 180 degrees opposite to each other with the centers of the columns 26 and 27 interposed therebetween.

  That is, as shown in FIG. 6, the half cylinder 24B of the left leg portion 24 includes a virtual line P1-O connecting the edge portion 24B2 on one end side in the circumferential direction and the center O of the left column 26, and the other in the circumferential direction. An angle α1 (opening angle α1 of the concave surface portion 24B1 of the half cylinder 24B) formed by a virtual plane P2-O connecting the end edge portion 24B3 on the end side and the center O of the left column 26 is approximately 180 degrees. Is set to As a result, the contact area between the concave surface portion 24B1 and the outer peripheral surface of the left column 26 can be optimized, and the load applied from the canopy 21 to the left leg portion 24 is surfaced by the concave surface portion 24B1 and the outer peripheral surface of the left column 26. It can be supported in a well-balanced manner by the contacting portion and a welded portion 30 described later provided between the end edge portions 24B2 and 24B3 and the outer peripheral surface of the left column 26. The same applies to the half cylinder 25B of the right leg 25.

  Further, as shown in FIG. 2, FIG. 8, etc., the concave surface portion 24 </ b> B <b> 1 of the left leg portion 24 and the concave surface portion 25 </ b> B <b> 1 of the right leg portion 25 are fixed to the connecting plate 22. In a state, they are arranged so as to be substantially back to back. That is, in a state where the left and right leg portions 24 and 25 are fixed (welded) to both ends of the connection plate 22, the concave surface portions 24 </ b> B <b> 1 and 25 </ b> B <b> 1 open toward both ends in the length direction of the connection plate 22. Are arranged so that each. Thereby, for example, when a load in the left and right directions is applied to the canopy 21, the load can be reliably supported by the concave surface portion 24B1 of the left leg portion 24 and the concave surface portion 25B1 of the right leg portion 25. .

  A pair of reinforcing ribs 24C and 25C which are provided between the bottom plate portions 24A and 25A and the half cylinders 24B and 25B and face the front and the rear are widened toward the lower side (the connection plate 22 side). 22 is formed as a substantially triangular plate extending along the upper surface of 22. Then, the reinforcing ribs 24C and 25C are reinforced so as to support the half cylinders 24B and 25B between the half cylinders 24B and 25B and the bottom plate parts 24A and 25A. , 25 to increase the strength.

  26 indicates a left column disposed on the left rear side of the driver's seat 12, and 27 indicates a right column disposed on the right rear side of the driver's seat 12. The left and right struts 26 and 27 are attached to the left and right leg portions 24 and 25 on the lower side and extend upward, and a roof 29 (described later) covering the upper side of the driver's seat 12 is attached to the upper side. Here, the left and right struts 26 and 27 are formed in a substantially inverted L shape, for example, by subjecting a hollow pipe member to a desired bending process, and extend upward from the left and right leg portions 24 and 25. The upper end side extends to the front side above the driver's seat 12.

  Reference numeral 28 denotes a connecting beam provided between the left column 26 and the right column 27. The connecting beam 28 extends in the left and right directions and connects the left and right support columns 26 and 27. The connecting beam 28 is a state in which the left and right support columns 26 and 27 are separated in the left and right directions. Reinforce with.

  Reference numeral 29 denotes a roof provided at an upper position of the left and right support columns 26 and 27, and the roof 29 covers the upper side of the operator seated on the driver's seat 12. Here, the roof 29 covers the upper side of the driver's seat 12 by being attached to the upper end sides of the left and right support columns 26 and 27, and protects the operator seated on the driver's seat 12 from rainwater and the like.

  Next, a welding structure between the left and right leg portions 24 and 25 and the left and right support columns 26 and 27 will be described.

  Reference numeral 30 denotes a welded portion for fixing (joining) the outer peripheral surfaces of the left and right struts 26 and 27 to the half cylinders 24B and 25B of the left and right leg portions 24 and 25. Between each edge 24B2, 24B3 on the opening side of the split cylinder 24B and the outer peripheral surface of the left column 26, each edge 25B2, 25B3 on the opening side of the half cylinder 25B and the outer peripheral surface of the right column 27 Are provided in the upward and downward directions, respectively.

  Here, the welded portion 30 is in a state in which the lower end portions of the support columns 26 and 27 are fitted to the concave surface portions 24B1 and 25B1 of the half-cylinders 24B and 25B. Welding between the edge portions 24B2 and 24B3 and the outer peripheral surface of the left column 26 and between the respective end edge portions 25B2 and 25B3 of the half cylinder 25B and the outer peripheral surface of the right column 27 in the upward and downward directions, respectively. It is formed by. Thereby, compared with the case where all-around welding as in the prior art is performed, it is possible to suppress the difference in the thickness of the welded portion 30 in the upward and downward directions (reducing the change in the cross section of the welded portion 30). It is possible to suppress an increase in stress at the welded portion 30 (stress concentration).

  Next, the assembly procedure of the canopy 21 will be described.

  That is, when the canopy 21 is assembled, for example, the left and right leg portions 24 and 25 are fixed to both ends of the connecting plate 22 in the length direction by welding. Further, for example, both ends of the connecting beam 33 are fixed by welding between the left and right struts 26 and 27, and the roof 29 is attached to the upper ends of the left and right struts 26 and 27. Then, the lower ends of the left and right struts 26 and 27 are fitted into the half cylinders 24B and 25B of the left and right legs 24 and 25 (uneven fitting), and in this fitted state, the half cylinders are fitted. Up and down between the end edges 24B2 and 24B3 of the body 24B and the outer peripheral surface of the left column 26, and between the end edges 25B2 and 25B3 of the half cylinder 25B and the outer peripheral surface of the right column 27, respectively. The canopy 21 can be assembled by welding over (providing the welded portion 30).

  Further, the canopy 21 assembled in this way is arranged on the upper surface portion 8A of the counterweight 8, and in this state, the bolt insertion holes 24A1, 25A1 of the left and right leg portions 24, 25 and the bolt insertion holes of the connecting plate 22 are provided. The bolt 23 inserted through 22A is screwed into the bolt hole 8B of the counterweight 8 so that it can be firmly attached to the counterweight 8 via the connecting plate 22.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. When performing excavation work of earth and sand using the hydraulic excavator 1, first, the operator is seated in the driver's seat 12 and the travel operation lever By operating 14, the excavator 1 can be run. Then, by operating the work operation lever 13, the operator can raise and lower the work device 4 while turning the upper swing body 3, and can perform excavation work of earth and sand using the work device 4.

  Here, in the hydraulic excavator 1 according to the present embodiment, the leg portions 24 and 25 to which the support posts 26 and 27 of the canopy 21 are attached are constituted by the half cylinders 24B and 25B having semicircular inner surfaces. Therefore, each support | pillar 26 and 27 can be fixed in the state which made the surface contact to each leg part 24 and 25 up and down. At this time, between each edge 24B2, 24B3 of the left leg 24 and the outer peripheral surface of the left support 26, between each edge 25B2, 25B3 of the right leg 25 and the outer periphery of the right support 27, It is possible to provide a welded portion 30 that sticks between the two in the upward and downward directions.

  For this reason, the difference in the thickness of the welded portion 30 can be reduced in the upward and downward directions (more preferably, the thickness can be made uniform in the upward and downward directions) (change in the cross section of the welded portion 30 can be reduced). ), It is possible to suppress an increase in the stress of the welded portion 30 (stress concentration). Thereby, the intensity | strength and durability of the junction part of each leg part 24 and 25 and each support | pillar 26 and 27 can be improved, and stability and reliability of the hydraulic shovel 1 can be improved.

  Further, according to the present embodiment, the left and right leg portions 24 and 25 are connected by the connecting plate 22, so that the leg portions 24 and 25 connected by the connecting plate 22 are connected to the counterweight 8. Can be installed integrally. Thereby, each leg part 24 and 25 can be stably attached to the counterweight 8, and the attachment property (easy to attach) of each leg part 24 and 25 with respect to the counterweight 8 can be improved.

  Further, according to the present embodiment, since the reinforcing ribs 24C and 25C are provided on the left and right leg portions 24 and 25, the strength of each of the leg portions 24 and 25 can be increased. , 25 can be improved in durability and reliability.

  In the embodiment described above, the edge portions 24B2 and 25B2 on one end side in the circumferential direction of the half cylinders 24B and 25B and the edge portions 24B3 and 25B3 on the other end side are sandwiched by the center O of the columns 26 and 27. The case where the configuration is arranged on the opposite side of 180 degrees has been described as an example. That is, as shown in FIG. 6, the case where the opening angle α1 of the concave portion 24B1 of the half cylinder 24B is set to 180 degrees has been described as an example.

  However, the present invention is not limited to this. For example, as in the first modification shown in FIG. 9, even if the opening angle α2 of the concave portion 24B1 ′ of the half cylinder 24B ′ is set to be larger than 180 degrees. Good. That is, the phantom line P3-O connecting the edge 24B2 'on one end in the circumferential direction of the half cylinder 24B' and the center O of the left column 26, the edge 24B3 'on the other end in the circumferential direction and the left column The angle α2 formed with a virtual plane P4-O that connects the center O of 26 may be, for example, 230 degrees to 240 degrees.

  On the other hand, for example, as in the second modification shown in FIG. 10, the opening angle α3 of the concave surface portion 24B1 ″ of the half cylinder 24B ″ may be set smaller than 180 degrees. That is, an imaginary line P5-O connecting the edge 24B2 "on one end in the circumferential direction of the half cylinder 24B" and the center O of the left support 26, an edge 24B3 "on the other end in the circumferential direction and the left support The angle α3 formed by a virtual plane P6-O connecting the center O of 26 may be 140 to 150 degrees, for example.

  In the above-described embodiment, the case where the canopy 21 is configured to be attached to the counterweight 8 serving as a base member has been described as an example. However, the present invention is not limited to this. For example, as in the third modification shown in FIGS. 11 to 13, a support frame (support member) 31 is provided on the turning frame 6 ′ across the engine 7 ′. It is good also as a structure which attaches the canopy 21 to this support frame 31 used as a base member.

  That is, the support frame 31 has four legs 31A, 31B, 31C, and 31D attached to the revolving frame 6 'on the lower end side, and is attached to the upper ends of the legs 31A, 31B, 31C, and 31D on the left, A support member 31E extending in the right direction is roughly configured. The support member 31E is provided with three bolt insertion holes (not shown) corresponding to the bolt insertion holes 22A of the connecting plate 22, and the canopy 21 is attached to the support frame 31 in each bolt insertion hole. A bolt 23 'for mounting is inserted.

  Such a support frame 31 can be assembled by attaching the upper end side of each leg part 31A, 31B, 31C, 31D to the support member 31E. Further, the support frame 31 assembled in this way is provided across the engine 7 'on the revolving frame 6' by attaching the lower end side of each leg 31A, 31B, 31C, 31D to the revolving frame 6 '. be able to. The canopy 21 is attached to the support member 31E of the support frame 31 provided on the revolving frame 6 using the bolt 23 '.

  In the above-described embodiment, the case where the left and right leg portions 24 and 25 are connected by the connecting plate 22 separate from the leg portions 24 and 25 has been described as an example. However, the present invention is not limited to this. For example, the left and right leg portions 24 and 25 and the connecting plate 22 may be integrally formed. That is, the left and right leg portions 24 and 25 and the connecting plate 22 may be integrally formed using, for example, casting means.

  Further, in the above-described embodiment, the crawler hydraulic excavator 1 is described as an example of the construction machine provided with the canopy 21, but the present invention is not limited to this, and any construction machine provided with the canopy may be used. The present invention can also be applied to other construction machines such as a wheel-type hydraulic excavator and a wheel loader.

1 Excavator (construction machine)
2 Lower traveling body 3 Upper revolving body 4 Working device 6, 6 'Turning frame (frame)
7,7 'engine 8 counterweight (base member)
12 Driver's seat 21 Canopy 22 Connecting plate 24 Left leg (leg)
24B, 24B ', 24B "Half cylinder 24B1, 24B1', 24B1" Concave surface (semi-circular inner surface)
24B2, 24B3, 24B2 ', 24B3', 24B2 ", 24B3" Edge 24C Reinforcement rib 25 Right leg (leg)
25B Half cylinder 25B1 Concave surface (semi-circular inner surface)
25B2, 25B3 End edge portion 25C Reinforcement rib 26 Left column 27 Right column 29 Roof 30 Welded portion 31 Support frame (base member)

Claims (4)

A frame on which a working device and an engine are mounted as a support structure; a driver seat provided on the frame on which an operator sits; and a canopy mounted on a base member on the frame side and covering the driver seat. ,
The canopy is located on the rear side of the driver's seat and is attached to the pedestal member, and left and right legs, and the lower side is attached to the legs and extends upward. In construction machinery consisting of left and right struts to which the covering roof is attached,
Each leg is formed of a half cylinder having a semicircular arc-shaped inner surface,
The outer peripheral surface of each support column is fixed to the end edge portion on the opening side of each half cylinder that forms each leg by welding upward and downward, respectively. Construction machinery.   The connecting plate for connecting the leg portions is provided between the leg portions constituting the canopy, and the canopy is configured to be attached to the pedestal member via the connecting plate. Construction machinery.   The construction machine according to claim 1 or 2, wherein each leg is provided with a reinforcing rib extending along an upper surface of the connection plate.   The frame side pedestal member is a counterweight provided on the rear side of the frame in order to balance the weight with the work device, or a support frame provided on the frame across the engine. The construction machine according to claim 1, 2, or 3.

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