JP4387893B2 - Construction machinery cab - Google Patents

Description

  The present invention relates to a cab for construction machinery that is suitably used for, for example, a hydraulic excavator, a wheel loader, and the like.

  In general, a hydraulic excavator as a construction machine is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a front-rear side of the upper revolving body that can be raised and lowered. And a work device.

  A cab is mounted on the revolving frame constituting the upper revolving structure so as to be located on the left front side. The cab of this hydraulic excavator includes, for example, a base frame made of a frame structure, a hollow cab box that is provided on the base frame and defines a cab inside, and closes the lower side of the cab box. And a floor plate attached to the base frame.

  A driver's seat on which the operator is seated is provided on the floor board, work lever devices for operating the work device and the like are provided on the left and right sides of the driver seat, and a travel lever device is provided on the front side. Is provided. The working lever device provided on both the left and right sides of the driver's seat has an operation lever tiltably attached to the front side of the console on which various switches, indicators and the like are arranged.

  On the other hand, the base frame forming the lower part of the cab is formed as a rectangular frame structure extending in the front and rear directions. Further, the base frame is provided with a vibration isolating mount for supporting the cab in a vibration isolating state at the left front, right front, left rear, and right rear corner positions, and a floor plate is attached to the lower side.

  Here, the base frame body is provided with mount mounting holes through which the mounting screws of the anti-vibration mounts are inserted at the respective corner positions, and a floor plate is provided below the base frame body between the mount mounting holes. A bolt insertion hole through which a bolt for fastening is inserted is provided. On the other hand, the floor plate is provided with mount mounting holes at respective corner positions corresponding to the mount mounting holes of the base frame, and screw holes (welding nuts) at positions corresponding to the bolt insertion holes.

  Next, the procedure for assembling the cab will be described. First, a driver's seat is attached to the center of the floor board, working lever devices are attached to both the left and right sides of the driver's seat, and a traveling lever device is attached to the front side of the floor board. Thus, if a driver's seat, each lever apparatus, etc. are previously attached to a floor board, the floor board with which the driver's seat etc. were attached will be mounted in the left front side of a turning frame.

  And if a floor board is mounted on a turning frame, the base frame body to which the cab box was attached will be arrange | positioned on a floor board. In this state, a nut is screwed to the tip of the mounting screw of each anti-vibration mount protruding from the mounting holes formed at the four corners of the base frame and the floor plate, and the bolt inserted into the bolt insertion hole of the base frame is fixed to the floor plate. By screwing into the screw holes, the base frame body, the cab box, and the floor board can be integrated to assemble the cab, and the cab can be mounted on the revolving frame via the four anti-vibration mounts.

  Here, since a working lever device is attached to both the left and right sides of the driver's seat, there is no space for handling a tool such as a spanner on the lower side of each lever device, and the bolt cannot be turned. For this reason, among the multiple bolts (bolt insertion holes, screw holes) that fasten the base frame and the floorboard, the bolts located on the left and right sides of the driver's seat should be forward and backward to avoid the lever device. They are arranged with a wide space.

  However, if the bolts that fasten the base frame and the floorboard on the left and right sides of the driver's seat are arranged with a wide space in the front and rear directions, the support strength of the center part of the floorboard located between these bolts will decrease. End up. As a result, vibration is likely to occur at the center portion of the floorboard.

  Therefore, some cabs of hydraulic excavators have a configuration that suppresses vibrations at the center portion of the floor board in order to solve the above-described problem. In this cab, a beam plate or a reinforcing member extending in the left and right directions is provided at the center portion on the floor plate, and the center of the floor plate is separated between the floor plate and the swivel frame separately from the anti-vibration mounts at the four corners. Two anti-vibration mounts that support the portion are added and arranged (see, for example, Patent Document 1).

JP-A-9-32037

  By the way, according to the above-described prior art, a beam plate or the like is mounted on the floor plate, and two additional vibration-proof mounts are additionally mounted between the swivel frame and the floor plate. In addition, there is a problem that labor and time are required for attaching the cab to the revolving frame, and the manufacturing cost is also increased.

  In addition, between the floor plate and the swivel frame, hydraulic piping, electrical wiring, valve devices, etc. are arranged so as to be dense, so when an anti-vibration mount is arranged between the floor plate and the swivel frame, There is a risk of problems such as interference.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is a construction machine capable of suppressing vibration of a floor board with a simple configuration and improving assembly workability, work environment, and the like. It is to provide a cab for use.

A cab for a construction machine according to a first aspect of the present invention is a base frame comprising a frame structure provided on a frame of a construction machine and having left and right connection frames that are spaced apart in the left and right directions and extend in the front and rear directions. A body, a hollow cab box provided on the base frame and defining a cab inside, and a plurality of first bolts fastened to the base frame so as to close the lower side of the cab box And a driver's seat provided on the floor plate and seated by an operator.

Then, in order to solve the above problems, characteristic of the structure of the invention of claim 1 is employed, the lower side of the floor plate, along at least one of the connection frame of each connection frame of the base frame A reinforcing member extending in the front and rear directions is provided, and the reinforcing member is fastened together with the base frame and the floor plate using the first bolt in a state of sandwiching the floor plate with the base frame. In addition , the floor plate and the reinforcing member are configured to be fastened using a second bolt that is separate from the first bolt that fastens the base frame body, the floor plate, and the reinforcing member together .

According to the invention of claim 2 , a lever device having an operation lever is provided on the left and right sides of the driver's seat, and the reinforcing member is provided along the connection frame of the base frame body. before the lower lies in that the extension building structure backward.

According to the invention of claim 3, the reinforcing member is provided so as to extend between adjacent first bolts among the bolts, and the second bolt is located between the adjacent first bolts and the floor plate. The configuration is such that the reinforcing member is fastened.

According to the first aspect of the present invention, the reinforcing member that extends in the front and rear directions along the portion where the connection frame of the base frame is disposed below the floor board is formed using the plurality of first bolts. And the floor plate and the reinforcing member are fastened using a second bolt that is separate from the first bolt that fastens the base frame body, the floor plate and the reinforcing member together. Therefore, the floor board can be supported from the lower side by the reinforcing member, and the vibration of the floor board can be suppressed. Therefore, for example, it is not necessary to add an anti-vibration mount separately from the anti-vibration mount that elastically supports the cab on the frame, and it is only necessary to fasten the reinforcing member on the lower side of the floor plate. In addition, workability such as the work of attaching the cab to the frame can be improved, and the manufacturing cost can be reduced. In addition, by suppressing the vibration of the floor board by the reinforcing member, it is possible to improve the working environment of the operator who sits on the driver's seat and works.

Furthermore , when attaching the base frame and the floor board, the reinforcing member can be attached to the floor board in advance using a second bolt that is separate from the first bolt. This can be easily performed, and the assembly workability can be improved. Further, the floor board and the reinforcing member can be firmly fastened by the second bolt, and the vibration of the floor board can be effectively suppressed.

According to the invention of claim 2, the reinforcing member is left of the driver's seat, at least one position of the right, front the lower lever device along the connecting frame of the base frame, and configured to Ru extending rearward Therefore, for example, the reinforcing member can be provided while avoiding hydraulic piping, electrical wiring, valve devices and the like disposed between the floor plate and the frame.

According to the invention of claim 3 , the second bolt separate from the first bolt for fastening the base frame body, the floor plate and the reinforcing member together is located between the first bolts where the supporting strength of the floor plate is lowered . And the reinforcing member can be fastened, so that the support strength of the floor board can be increased and vibration can be effectively suppressed.

  Hereinafter, as a construction machine cab according to an embodiment of the present invention, a cab provided in a crawler type hydraulic excavator will be described as an example and described in detail with reference to FIGS. 1 to 11.

  In FIG. 1, reference numeral 1 denotes a crawler-type hydraulic excavator as a construction machine. The hydraulic excavator 1 includes a lower traveling body 2 capable of self-propelling and an upper revolving body 3 mounted on the lower traveling body 2 so as to be capable of swiveling. And a work device 4 that is provided on the front side of the upper swing body 3 so as to be able to move up and down and that performs excavation work of earth and sand. The upper swing body 3 includes a later-described swing frame 5 that is turnable on the lower traveling body 2 and a later-described cab 11 that is disposed on the left front side of the swing frame 5. Yes.

  Reference numeral 5 denotes a revolving frame formed as a support structure that forms the base of the upper revolving structure 3, and the revolving frame 5 includes a thick bottom plate 5A provided extending in the front and rear directions, as shown in FIG. The left and right vertical plates 5B and 5B are installed on the bottom plate 5A so as to extend in the front and rear directions, and the working device 4 is attached to the front side, and the bottom plate 5A and the vertical plates 5B from the left and right sides to the left and right. A plurality of overhanging beams 5C, left and right side frames 5D and 5D provided to extend forward and rearward at the front ends of the overhanging beams 5C, and a later-described left front frame The cab support portion 6 is generally configured.

  Reference numeral 6 denotes a cab support portion that forms a part of the revolving frame 5 and is provided on the left front side of the revolving frame 5. The cab support portion 6 is separated from the bottom plate 5 </ b> A and the left vertical plate 5 </ b> B to the left side. Two horizontal beams 6A and 6B, the front ends of which are fixed to the left side frame 5D, a vertical beam 6C extending from the right end of the horizontal beam 6A to the front side in parallel with the left side frame 5D, and the horizontal beam 6A. A front frame 6D that extends in the left and right directions with a gap on the front side of the frame and that connects the left side frame 5D and the vertical beam 6C.

  Further, the horizontal beam 6B and the front frame 6D of the cab support portion 6 are provided with two mount insertion openings 6B1 and 6D1 which are spaced apart from each other on the left and right, respectively, and the mount insertion openings 6B1 and 6D1 are described later. The anti-vibration mount 23 is attached.

  Next, 11 is a cab of the hydraulic excavator 1 mounted on the cab support portion 6 of the revolving frame 5, and the cab 11 is provided on the cab support portion 6 via a vibration-proof mount 23 described later. The cab 11 includes a base frame 12, a cab box 13, a floor plate 14, bolts 15, 17, 18, a reinforcing member 16, a driver's seat 19, a work, which will be described later, as shown in FIGS. This is roughly constituted by the lever device 21 for use.

  Reference numeral 12 denotes a base frame provided on the lower side of the cab 11, and the base frame 12 is formed as a rectangular frame structure elongated in the front and rear directions, as shown in FIGS. ing. That is, the base frame 12 has a front connecting frame that connects the left front corner portion 12A, the right front corner portion 12B, the left rear corner portion 12C, the right rear corner portion 12D, and the corner portions 12A to 12D. 12E, a rear connection frame 12F, a left connection frame 12G, and a right connection frame 12H. Further, the left and right connection frames 12G and 12H are provided with mounting seats 12J protruding inward at the respective front and rear positions.

  On the other hand, each corner portion 12A to 12D of the base frame body 12 is formed with a mount mounting hole 12K through which the mounting screw 23A of the anti-vibration mount 23 is inserted. The front connection frame 12E and the rear connection frame 12F of the base frame body 12 are provided with, for example, two bolt insertion holes 12L through which bolts 15 to be described later for fastening the base frame body 12 and the floor plate 14 are inserted. . Furthermore, a bolt 17 into which a later-described bolt 17 for fastening the three members of the base frame body 12, the floor plate 14, and a later-described reinforcing member 16 together is inserted into each mounting seat 12 </ b> J of the left and right connection frames 12 </ b> G and 12 </ b> H. An insertion hole 12M is provided.

  Here, as shown in FIG. 3, the mounting seat 12J (bolt insertion hole 12M) of the base frame 12 that is the fastening position of the base frame 12 and the floor plate 14 is provided on both the left and right sides of the driver seat 19 described later. A position where the provided working lever device 21 is avoided in the front and rear directions, that is, a bolt 17 for tightening three members to be described later is tightened using a tool such as a spanner without being obstructed by the working lever device 21. It is arranged far away in the front and rear direction to the position where it can be.

  13 is a cab box provided on the base frame 12, and the cab box 13 constitutes the outer shape of the cab 11, and defines a cab inside. 1, 3 and 5, the cab box 13 is formed as a box-like body by four surfaces of the front surface portion 13A, the rear surface portion 13B, the left side surface portion 13C, the right side surface portion 13D and the top surface portion 13E. Yes. A front window (not shown) is attached to the front surface portion 13A, and a door 13F (shown in FIG. 1) is attached to the left side surface portion 13C so as to be openable and closable. In the cab box 13, the lower portions of the front surface portion 13A, the rear surface portion 13B, the left side surface portion 13C, and the right side surface portion 13D are fixed around the base frame 12 using, for example, welding means.

  Reference numeral 14 denotes a floor plate that closes the lower side of the cab box 13, and the floor plate 14 constitutes a part of the cab 11, and is a rectangular plate that is long in the front and rear directions according to the base frame body 12. It is formed as. Mount attachment holes 14 </ b> A are provided at positions corresponding to the mount attachment holes 12 </ b> K of the base frame body 12 at the left front, right front, left rear, and right rear corner positions of the floor plate 14. Further, on the front side and the rear side of the floor plate 14, for example, two screw holes 14B are provided at positions corresponding to the bolt insertion holes 12L of the base frame body 12 so as to be separated to the left and right.

  Further, on the left side and the right side of the floor plate 14, for example, four pieces are spaced apart from each other at a position corresponding to a bolt insertion hole 12 </ b> M of the base frame 12 and a position corresponding to a screw hole 16 </ b> B of a reinforcing member 16 described later. The bolt insertion hole 14C is provided. Further, for example, four screw holes 14D are provided in the substantially central portion of the floor plate 14, and bolts 20 for attaching a pedestal 19A of the driver's seat 19 described later are screwed into the screw holes 14D. In addition, the screw holes 14B and 14D described above may be formed by directly engraving female screws in the floor plate 14, or a nut (not shown) may be welded to the lower surface of the floor plate 14.

  Here, as shown in FIGS. 5 to 8, the floor plate 14 is fastened together with the base frame 12 by inserting the mounting screws 23 </ b> A of the anti-vibration mount 23 into the mount mounting holes 14 </ b> A at the four corners. . Further, the floor plate 14 is fastened to the base frame body 12 at the front side and the rear side by screwing the floor plate bolts 15 inserted into the bolt insertion holes 12L of the base frame body 12 into the front and rear screw holes 14B. ing. Further, the floor plate 14 inserts bolts 17 for fastening three members, which will be described later, inserted into the bolt insertion holes 12M of the base frame body 12 into the bolt insertion holes 14C at the front and rear ends, and the bolts 17 will be described later. By being screwed into the screw holes 16 </ b> B of the reinforcing member 16, they are fastened together while being sandwiched between the base frame body 12 and the reinforcing member 16.

  Reference numeral 16 denotes two reinforcing members located on the left and right sides of a driver's seat 19 which will be described later, located below the floor plate 14. The reinforcing member 16 suppresses the vibration of the floor plate 14 by supporting the front and rear intermediate portions of the floor plate 14 from the lower side. Further, as shown in FIG. 11, the reinforcing member 16 is made of, for example, an angle member having a sufficient strength and a substantially L-shaped cross section, and left and right connection frames 12 </ b> G and 12 </ b> H constituting the base frame body 12 are arranged. It extends in the front and back directions over the mounting seats 12J so as to be along the part. Further, the reinforcing member 16 is formed with four screw holes 16B that are located on the upper surface portion 16A that abuts the floor plate 14 and correspond to the bolt insertion holes 12M of the base frame body 12 and the bolt insertion holes 14C of the floor plate 14. ing.

  Here, the reinforcing member 16 has the bolts 17 inserted through the bolt insertion holes 12M of the base frame body 12 and the bolt insertion holes 14C of the floor plate 14 into the screw holes 16B at the front and rear ends of the four screw holes 16B. The base frame 12 and the floor plate 14 are fastened together by screwing. Accordingly, the reinforcing member 16 can be supported with the floor plate 14 sandwiched between the base frame body 12 and the fastening position of the base frame body 12 and the floor plate 14 as shown in FIGS. Even when the position of the bolt insertion hole 12M (mounting seat 12J) of the base frame body 12 is greatly separated with a wide interval in the front and rear directions, the central portion of the floor plate 14 located in this separated portion vibrates. Can be prevented.

  Further, the reinforcing member 16 inserts an additional bolt 18 to be described later into two bolt insertion holes 14C located in the middle of the four bolt insertion holes 14C of the floor board 14, and is screwed into the intermediate screw hole 16B. By doing so, it can be fastened to the floor board 14. Thereby, when attaching the floor board 14 to the base frame 12, the reinforcement member 16 can be previously attached to the floor board 14 by the bolts 18. Further, the floor plate 14 and the reinforcing member 16 can be firmly fastened by the additional bolt 18.

Reference numeral 17 denotes four three-member fastening bolts as first bolts for fastening the base frame body 12, the floor plate 14, and the reinforcing member 16. The bolts 17 are adjacent to each other in the front and rear directions. Is arranged. Further, as shown in FIG. 6 and the like, each bolt 17 is inserted through each bolt insertion hole 12M of the base frame body 12 and the bolt insertion hole 14C of the floor plate 14, and into the screw holes 16B at the front and rear ends of the reinforcing member 16. By screwing, the floor plate 14 is fastened together between the base frame 12 and the reinforcing member 16 as shown in FIG.

Reference numeral 18 denotes, for example, four additional bolts as second bolts provided separately from the bolts 17 for fastening the three members. Each of the bolts 18 is located between the two bolts 17 separated in the front and rear directions. Is arranged. Then, as shown in FIG. 6, each bolt 18 is inserted into two bolt insertion holes 14 </ b> C located between the bolts 17 for fastening the three members together, and the tip portion is screwed into the screw hole 16 </ b> B of the reinforcing member 16. By doing so, as shown in FIG. 10, the floor board 14 and the reinforcing member 16 are combined.

  Reference numeral 19 denotes a driver's seat provided at a substantially central portion on the floor board 14, and the operator's seat 19 is seated by an operator. The driver's seat 19 includes a pedestal 19A attached to the substantially central portion of the floor plate 14 using a mounting bolt 20, an adjustment mechanism 19B provided on the pedestal 19A, for adjusting the seating position, and the adjustment mechanism 19B. And a seat 19C on which an operator is seated.

  Reference numeral 21 denotes a working lever device provided on both the left and right sides of the driver's seat 19, and each working lever device 21 operates the working device 4 and the like. The working lever device 21 is roughly constituted by a console 21A provided with various switches, indicators, and the like, and an operation lever 21B provided on the front side of the console 21A so as to be tiltable.

  Here, in the working lever device 21, the console 21 </ b> A is approaching the cab box 13 as shown in FIG. 3. For this reason, the space which handles tools, such as a spanner, cannot be secured under the console 21A. For this reason, in the base frame body 12 described above, the mounting seat 12J to which the bolts 17 are attached is spaced apart in the front and rear directions so as to avoid the console 21A of the working lever device 21.

  Reference numeral 22 denotes a traveling lever device provided at the front portion of the floor plate 14, and the traveling lever device 22 is roughly composed of a lever 22A for traveling the lower traveling body 2 and a pedal 22B linked to the lever 22A. ing.

  Reference numeral 23 denotes, for example, four anti-vibration mounts (shown in FIG. 5 and the like) provided between the cab support 6 and the cab 11 of the revolving frame 5. The cab 11 is elastically supported with respect to the cab support portion 6 by being arranged at four locations on the right front, left rear, and right rear. The anti-vibration mounts 23 are attached to the mount insertion openings 6D1 formed in the front frame 6D of the cab support portion 6 and the mount insertion openings 6B1 formed in the horizontal beam 6B. In addition, each anti-vibration mount 23 has a mounting screw 23A protruding upward inserted into the base frame 12 and the mounting holes 12K and 14A of the floor plate 14 from below, and a nut 24 is screwed to the protruding end. The cab 11 is supported.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, an operation for assembling the cab 11 and mounting it on the revolving frame 5 will be described.

  First, the cab box 13 is fixed integrally around the base frame 12 using, for example, welding means. On the other hand, a driver's seat 19 is attached to a substantially central portion of the floor plate 14, and work lever devices 21 are attached to the left and right sides of the driver's seat 19. A traveling lever device 22 is attached to the front side of the floor plate 14. Further, the reinforcing member 16 is fastened to the lower side of the floor plate 14 using an additional bolt 18.

  Thus, when the driver's seat 19 and the lever devices 21 and 22 are mounted on the floor plate 14 and the reinforcing member 16 is mounted on the lower side of the floor plate 14, the floor plate 14 to which the driver's seat 19 and the like are mounted is attached to the cab of the revolving frame 5. The mounting screws 23A of the vibration-proof mounts 23 are inserted into the mount mounting holes 14A formed at the four corners of the floor board 14 by being transported onto the support portion 6. Next, the base frame 12 to which the cab box 13 is attached is moved onto the floor plate 14, and the base frame 12 is brought into contact with the periphery of the floor plate 14. At this time, the mounting screws 23 </ b> A of the anti-vibration mounts 23 are inserted into the mount mounting holes 12 </ b> K of the base frame body 12.

  When the floor plate 14, the base frame 12, and the cab box 13 are placed on the cab support portion 6 (on each vibration isolation mount 23) of the revolving frame 5, a nut 24 is used for the mounting screw 23 </ b> A of each vibration isolation mount 23. The base frame 12 and the floor plate 14 are fastened together, and the base frame 12, the floor plate 14, and the reinforcing member 16 are fastened using the floor plate bolts 15 and the three-member bolts 17. . Thus, the base frame body 12, the cab box 13, and the floor plate 14 are integrated to assemble the cab 11, and the cab 11 is mounted on the cab support portion 6 of the revolving frame 5 via the four vibration isolation mounts 23. be able to.

  Here, when the bolt 17 for tightening the three members is screwed to the reinforcing member 16, the reinforcing member 16 is attached in advance to the predetermined position of the floor board 14 with the additional bolt 18. There is no need to support, and the fastening operation of the base frame 12, the floor plate 14, and the reinforcing member 16 can be easily performed.

  In addition, since the four bolts 17 for fastening the three members are arranged at positions avoiding the working lever device 21, each bolt can be moved by a tool such as a spanner without being obstructed by the working lever device 21. 17 can be easily tightened.

  Next, the operation when the excavator 1 in which the cab 11 is mounted on the revolving frame 5 is operated as described above will be described.

  First, the operator gets into the cab 11 and sits in the driver's seat 19. By operating the traveling lever device 22 in this state, the crawler of the lower traveling body 2 can be driven to move the hydraulic excavator 1 forward or backward. An operator seated in the driver's seat 19 can perform work such as excavating earth and sand by operating the left and right working lever devices 21 to raise and lower the working device 4.

  Here, the hydraulic excavator 1 generates vibrations during traveling and work, and the vibrations are transmitted to the cab 11 and act to vibrate the floor plate 14. Since the bolts 17 for fastening the three members that fasten the floor plate 14 to the base frame 12 are separated from each other in the front and rear directions in order to avoid the working lever device 21, the floor plate 14 is provided with each bolt. There is a possibility that the central portion that is not supported by 17 vibrates greatly.

  However, in the present embodiment, the reinforcing member 16 is provided across the bolts 17 adjacent to each other in the front and rear directions, and the floor plate 14 is sandwiched and fixed between the base frame body 12 and the reinforcing member 16. The center part of 14 can be supported and it can prevent that part vibrates. Furthermore, since the reinforcing member 16 is firmly fastened to the floor plate 14 by the additional bolt 18 between the adjacent bolts 17, the vibration of the floor plate 14 can also be suppressed by this. This makes it possible to improve the ride comfort during running and work.

  Thus, according to the present embodiment, the reinforcing member 16 is provided on the lower side of the floor plate 14 between the bolts 17 for fastening the three members separated in the front and rear directions. The floor plate 14 is sandwiched and supported between the body 12 and the reinforcing member 16. Therefore, the reinforcing member 16 can suppress the vibration of the central portion of the floor plate 14 located between the bolts 17 spaced in the front and rear directions.

  As a result, as described in the prior art, for example, it is not necessary to add another anti-vibration mount for supporting the central portion of the floor plate 14 separately from the anti-vibration mounts 23 at the four corners, and the reinforcement is provided below the floor plate 14. Since the vibration of the floor plate 14 can be suppressed only by fastening the member 16, workability such as assembling work of the cab 11 and attaching work of the cab 11 to the revolving frame 5 can be improved, and the manufacturing cost is also reduced. can do. Further, by suppressing the vibration of the floor plate 14 by the reinforcing member 16, it is possible to improve the working environment of the operator who sits on the driver's seat 19 and performs the work.

  In addition, when the floor plate 14 is attached to the base frame body 12, the reinforcing member 16 can be attached to the floor plate 14 in advance using an additional bolt 18, so that the fastening work between the base frame body 12 and the floor plate 14 can be easily performed. As a result, the assembly workability can be improved. Further, the floor plate 14 and the reinforcing member 16 can be firmly fastened by the bolts 18, and the vibration of the floor plate 14 can be effectively suppressed.

  Further, since the reinforcing member 16 is provided to extend in the front and rear directions at both the left and right positions of the driver's seat 19, for example, a hydraulic pressure disposed between the floor plate 14 and the cab support portion 6 of the revolving frame 5. A reinforcement member can be provided avoiding piping, electric wiring, a valve device, etc., and the freedom degree of a layout can be raised.

  Further, since the bolt 17 for tightening the three members is disposed at a position avoiding the working lever device 21 in the front and rear directions, the bolt 17 can be easily tightened during the assembling work, and the assembling workability is improved. Can be improved.

  In the embodiment, the case where the reinforcing member 16 is formed of an angle material having a substantially L-shaped cross section having sufficient strength has been described as an example. However, the present invention is not limited to this, and, for example, four screw holes 31B may be formed in the upper surface portion 31A of the square pipe material as in the reinforcing member 31 according to the modification shown in FIG. In addition, the reinforcing member may be formed using another strength member such as a channel material having a C-shaped cross section.

  Further, in the embodiment, the case where the reinforcing members 16 are provided on both the left and right sides of the driver's seat 19 has been described as an example. However, the present invention is not limited to this. For example, depending on the structure of the cab 11 and the strength required for the floor plate 14, the reinforcing member 16 may be provided only on either the left side or the right side of the driver's seat 19.

  Furthermore, in the embodiment, the cab 11 mounted on the crawler hydraulic excavator 1 is described as an example of the cab for the construction machine. However, the present invention is not limited to this, and may be applied to, for example, a cab of a hydraulic excavator provided with a wheel type lower traveling body. Furthermore, it can be widely applied to cabs of other construction machines such as hydraulic cranes, wheel loaders, tractors, and the like.

It is a front view showing a hydraulic excavator provided with a cab according to an embodiment of the present invention. It is a perspective view which expands and shows the turning frame in FIG. It is sectional drawing which expands and shows a cab from the arrow III-III direction in FIG. FIG. 4 is a cross-sectional view showing a state where a part of the driver's seat and each lever device are removed from the cab of FIG. 3. It is a disassembled perspective view which shows the cab and the cab support part of the revolving frame which were decomposed | disassembled. It is a disassembled perspective view shown in the state which decomposed | disassembled the base frame, the floor board, and the reinforcement member. It is sectional drawing which expands and shows a cab from the arrow VII-VII direction in FIG. FIG. 8 is an exploded cross-sectional view showing the cab shown in FIG. 7 in an exploded state. It is sectional drawing which expands from the arrow IX-IX direction in FIG. 4 and shows the fastening state of the base frame body, floor board, and reinforcement member by the bolt for 3 member joint fastening. It is sectional drawing which expands and shows the fastening state of the floor board and reinforcement member by an additional volt | bolt from the arrow XX direction in FIG. It is a perspective view which expands and shows a reinforcing member alone. It is a perspective view which expands and shows the reinforcement member by the modification of this invention alone.

Explanation of symbols

1 Hydraulic excavator (Construction machinery)
5 slewing frame 11 cab 12 base frame 13 cab box 14 floor board 15 floor board bolts 16, 31 reinforcing member 17 bolts for fastening the three members together 18 additional bolts (other bolts)
19 Driver's seat 23 Anti-vibration mount

Claims (3)

A base frame comprising a frame structure having left and right connection frames provided on the construction machine frame and extending in the left and right directions and extending in the front and rear directions, and an interior provided on the base frame A hollow cab box that defines a cab, a floor plate fastened to the base frame using a plurality of first bolts so as to close the lower side of the cab box, and an operator provided on the floor plate In a construction machine cab comprising a driver's seat on which
On the lower side of the floor plate, the front along at least one of the connection frame of each connection frame of the base frame, provided with a reinforcing member extending backward,
The reinforcing member is configured to be fastened together with said base frame and floor plate by using said first bolt in a state sandwiching the floor between said base frame,
The floor plate and the reinforcing member are configured to be fastened using a second bolt that is separate from the first bolt that fastens the base frame body, the floor plate, and the reinforcing member together . Cab. A lever device having an operation lever is provided on the left and right sides of the driver's seat, and the reinforcing member extends forward and rearward on the lower side of the lever device along the connection frame of the base frame body. construction machine cab according to claim 1 comprising as extending building construction. The reinforcing member is provided to extend between adjacent first bolts among the bolts, and the second bolt is positioned between the adjacent first bolts to fasten the floor plate and the reinforcing member. The cab for construction machines according to claim 1 or 2 .

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