JP2005219634A - Construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the strength of a part in a vicinity of a pipe through hole in a floor plate when the floor plate must be reinforced even after a driver's seat or the like is assembled to the floor plate. <P>SOLUTION: When the strength of a part in a vicinity of an air-conditioning pipe through hole 8B and a hydraulic hose through hole 8D in a floor plate 8 must be enhanced, a reinforcement plate 23 is additionally mounted on the floor plate 8, and the strength of the part in a vicinity of the through holes 8B and 8D is enhanced thereby. Even after a driver's seat 13 or the like is assembled to the floor plate 8, when the floor plate 8 must be reinforced, the strength of the floor plate 8 can be enhanced by the reinforcement plate 23, the strength of the floor plate 8 can be enhanced for a part of a hydraulic shovel 1, and durability and reliability can be enhanced thereby. In addition, the floor plate which need not be reinforced for the most of the hydraulic shovel 1 can be manufactured as a regular floor plate 8 without a reinforcement plate 23. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a construction machine suitably used as, for example, a hydraulic excavator, a hydraulic crane, a wheel loader, or the like.

  In general, a hydraulic excavator or the like is known as a construction machine. The hydraulic excavator includes a lower traveling body capable of self-propelling by driving a crawler track, and an upper swing mounted on the lower traveling body so as to be capable of pivoting. The main body and a working device provided on the front side of the upper revolving body so as to be able to move up and down are generally constituted.

  Here, the upper swing body has a floor plate located on the left side of the swing frame, and a cab that defines a cab is provided on the floor plate. Further, a driver's seat on which the operator is seated is provided on the floor board, and operation levers for operating the work device and the like are disposed on the left and right sides of the driver's seat. The left and right operation levers are connected to a control valve provided outside the cab via a plurality of hydraulic hoses.

  Some hydraulic excavators include an air conditioning unit in the cab, and the air conditioning unit supplies conditioned air into the cab to improve the environment in the cab. The air conditioning unit is connected to a condenser on the engine side through a plurality of air conditioning pipes. Furthermore, the floor board is provided with piping through holes through which air conditioning pipes, hydraulic hoses and the like are passed (for example, see Patent Document 1).

JP 2000-96621 A

  By the way, the hydraulic excavator according to the above-described prior art is subject to stress caused by impact or vibration during normal work performed within the range of performance, such as excavation work, earth removal work, and traveling work. It has enough strength to withstand.

  However, hydraulic excavators may be used for work that exceeds the range of performance.For example, work that digs asphalt or the like while directly breaking it with a bucket, work that runs on extreme rough roads for a long time, and front attachments that exceed the specified weight. In some cases, work may be performed with the attached. In this case, a large stress also acts on the floor board provided on the upper swing body due to shock and vibration during work.

  If stress is applied to the floor plate due to work exceeding the performance range, the stress tends to concentrate around the piping through hole provided in the floor plate. There is a possibility that a crack or the like may be generated at the position of, and there is a problem that durability and reliability are lowered.

  Therefore, in order to increase the strength of the floorboard, it is conceivable to increase the thickness of the floorboard, but it is a unique case to perform work exceeding the performance, and to increase the floorboard of all the hydraulic excavators, productivity, It cannot be said that it is a realistic search in terms of manufacturing costs.

  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 to increase the strength by attaching a reinforcing plate in the vicinity of the piping through hole of the floor board when the floor board needs to be reinforced. It is to provide a construction machine that can be used.

  A construction machine according to a first aspect of the present invention includes a frame constituting a vehicle body, a floor plate provided on the frame, and a driver seat provided on the floor plate and seated by an operator, and various pipings are provided on the floor plate. A piping through hole is provided.

  In order to solve the above-described problem, the feature of the configuration adopted by the invention of claim 1 is that a reinforcing plate that increases the strength in the vicinity of the pipe through hole is prepared separately from the floor plate, When the strength needs to be increased, the reinforcing plate is additionally attached to the floor plate.

  According to the invention of claim 2, the floor plate is attached to the vehicle body side using a vibration-proof mount, and the reinforcing plate is attached to the vibration-proof mount together with the floor plate.

  According to the invention of claim 3, the cab is attached to the floor board using a bolt, and the reinforcing plate is attached to the floor board together with the cab using the bolt.

  According to the invention of claim 4, the piping through hole provided in the floor board is provided with a hydraulic hose through hole through which a hydraulic hose connected to an operation lever provided on both the left and right sides of the driver's seat passes, and conditioned air. The reinforcing plate is configured to surround the hydraulic hose through hole and the air conditioning pipe through hole.

  According to a fifth aspect of the present invention, the reinforcing plate is provided with a spacer having a thickness dimension adjusted according to a step of the mounting portion on the floor plate side.

  According to the first aspect of the present invention, when it is necessary to increase the strength in the vicinity of the pipe through hole of the floor board, the strength in the vicinity of the pipe through hole can be increased by adding and attaching the reinforcing plate to the floor board. As a result, the strength of the floor board can be increased with respect to a part of construction machines that require reinforcement of the floor board, and the durability and reliability can be improved. In addition, most construction machines that do not require reinforcement can be manufactured as ordinary floorboards that are not provided with a reinforcing plate, and therefore can be manufactured as usual without the need for design changes.

  According to the second aspect of the present invention, since the reinforcing plate is attached to the vibration-proof mount together with the floor plate, the reinforcing plate can receive impact and vibration transmitted from the vibration-proof mount from the vehicle body side. . Thereby, since the stress which acts on a floor board can be made small, damage to a floor board can be prevented and reliability and durability can be improved.

  According to invention of Claim 3, when attaching a reinforcement plate to a floor board, a reinforcement plate can be attached to a floor board with this cab using the volt | bolt which attaches a cab to a floor board. Therefore, additional processing for attaching the reinforcing plate to the floor plate can be performed, or the reinforcing plate can be easily added and installed using pre-installed bolts, etc., without preparing additional bolts. It is possible to improve performance and reduce manufacturing costs.

  According to the invention of claim 4, since the reinforcing plate can surround the hydraulic hose through hole and the air conditioning piping through hole by attaching to the floor plate, the strength around each through hole where stress is likely to concentrate is effective. Can be enhanced.

  According to the invention of claim 5, a step is formed on the floor plate to which the reinforcing plate is attached by the already attached member or the like. However, since the reinforcing plate is provided with a spacer whose thickness is adjusted according to the level difference of the part to be attached, even when a level difference is formed on the floor plate, the entire reinforcing plate can be brought into close contact with the floor side. The strength of the floorboard can be increased efficiently.

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

  In FIG. 1, reference numeral 1 denotes a cab specification hydraulic excavator as a construction machine applied to the present embodiment. The hydraulic excavator 1 is capable of self-propelled lower traveling body 2 and swivel on the lower traveling body 2. The upper revolving structure 3 mounted on the upper revolving structure 2 and constituting the vehicle body together with the lower traveling structure 2 and the working device 4 provided on the front side of the upper revolving structure 3 so as to be able to be lifted and lowered and for performing excavation work of soil and the like. ing.

  Here, as shown in FIG. 1 and FIG. 2, the upper swing body 3 includes a swing frame 5 formed using, for example, a thick steel plate, an engine mounted on the rear side of the swing frame 5, and a hydraulic pump. (All not shown) and the like, and an outer cover provided from the right side to the rear side of the revolving frame 5 and covering the fuel tank, hydraulic oil tank, radiator, oil cooler (none shown), engine, etc. 6, a counterweight 7 attached to the rear end of the revolving frame 5, and a floor plate 8, a cab 12, a driver's seat 13, and the like which are provided on the left side of the revolving frame 5. Further, the swivel frame 5 is provided with screw seats 5A (only one is shown in FIG. 5) for attaching vibration-proof mounts 22 described later at positions corresponding to the four corners of the floor plate 8.

  8 is a floor plate attached to the left front side of the revolving frame 5 by using a vibration-proof mount 22 described later. The floor plate 8 is long in the front and rear directions and has a front and rear direction of the left edge as shown in FIG. It is formed as a substantially rectangular plate body projecting from the center. The floor plate 8 is formed with a plate thickness and a structure that can sufficiently withstand the stress caused by the impact or vibration at the time when the excavator 1 performs a normal operation within the performance range. On the other hand, at four corners of the floor plate 8, mount mounting holes 8A for mounting a vibration isolating mount 22 described later are formed.

  Further, as shown in FIG. 3, the floor plate 8 is formed with an air-conditioning pipe through hole 8B as a pipe through hole located near the left side of the mount mounting hole 8A provided at the right rear corner. The air-conditioning piping through hole 8B passes through a cooling water piping 20 and a refrigerant piping 21 described later, and is formed as a rectangular opening elongated in the left and right directions.

  Further, the floor plate 8 is formed with a hydraulic hose through hole 8C as a pipe through hole located at the rear center on the left side of the air conditioning pipe through hole 8B. The hydraulic hose through hole 8C has a left operation lever to be described later. The hydraulic hose 18 connected to 16 passes. The hydraulic hose through-hole 8C has a large opening so that the hydraulic hose 18 can be easily passed therethrough, and the opening can be made small so that the hydraulic hose 18 is not exposed by attaching a presser plate 9 described later.

  Further, the floor plate 8 is formed with a hydraulic hose through hole 8D as a pipe through hole located on the rear right side which is the front side of the air conditioning pipe through hole 8B. The hydraulic hose through hole 8D has a right operation lever which will be described later. The hydraulic hose 19 connected to 17 passes through. The hydraulic hose through-hole 8D is opened wide like the hydraulic hose through-hole 8C described above, and the opening can be reduced by attaching a presser plate 10 described later.

  Here, the air-conditioning pipe through-hole 8B provided in the floor board 8 is close to the engine mounted on the rear side in order to shorten the lengths of the cooling water pipe 20 and the refrigerant pipe 21 as much as possible, that is, the floor board 8. The formation position is determined on the right side of the rear part. In addition, the hydraulic hose through holes 8C and 8D are also formed on the rear side of the floor plate 8 so that the lengths of the hydraulic hoses 18 and 19 are as short as possible and are not disturbed. In addition, the air conditioning pipe through hole 8B and the hydraulic hose through holes 8C and 8D need to be opened to some extent in consideration of the ease of assembly of the cooling water pipe 20, the refrigerant pipe 21, and the hydraulic hoses 18 and 19.

  For this reason, the rear side of the floor plate 8, especially the right corner near the right rear side where the air conditioning pipe through hole 8B and the hydraulic hose through hole 8D approach each other, the large vibrations generated when the work exceeding the performance of the hydraulic excavator 1 is performed. There is a risk of deformation or cracking due to impact. However, a reinforcing plate 23, which will be described later, can be additionally attached to the right rear corner of the floor plate 8, and when the reinforcing plate 23 is attached to the floor plate 8, even against large vibrations and impacts. Sufficient strength can be obtained.

  In addition, a plurality of nuts 8E (only the peripheral side is shown in FIGS. 3 and 6) are welded to the rear surface of the floor plate 8 at the periphery and the rear side. Of the plurality of nuts 8E, each nut 8E at the peripheral portion is used when a cab 12 described later is attached to the floor plate 8. Further, the nuts 8E in the vicinity of the hydraulic hose through holes 8C, 8D of the floor plate 8 are used when attaching the press plates 9, 11 described later. Furthermore, the nut 8E disposed on the rear side of the floor plate 8 and spaced apart to the left and right is used when a pedestal 14 of the driver's seat 13 described later is attached to the floor plate 8.

  Reference numeral 9 denotes a presser plate attached to the position of the hydraulic hose through hole 8C of the floor plate 8. The presser plate 9 presses a hydraulic hose 18 (described later) passed through the hydraulic hose through hole 8C so as not to be exposed. The presser plate 9 is fixed to the floor plate 8 by screwing two bolts 11 to be described later onto the nut 8E.

  Reference numeral 10 denotes a press plate attached to the position of the hydraulic hose through hole 8D of the floor plate 8. The press plate 10 is the hydraulic hose described later passed through the hydraulic hose through hole 8D in the same manner as the press plate 9 described above. 19 and is fixed to the floor plate 8 by screwing two bolts 11 onto the nut 8E.

  Reference numeral 11 denotes a plurality of bolts provided on the floor plate 8, and each bolt 11 fixes other members such as the press plates 9 and 10, the cab 12 described later, and the base 14 of the driver's seat 13 to the floor plate 8. To do. Of the bolts 11, four bolts 11, specifically, one bolt 11 that fixes the presser plate 10 to the floor plate 8, and two bolts 11 that fix the cab 12 to the floor plate 8, The one bolt 11 fixing the pedestal 14 to the floor board 8 is used when a reinforcing plate 23 described later is additionally attached to the floor board 8.

  Reference numeral 12 denotes a cab provided on the upper side of the floor plate 8, and the cab 12 covers a periphery of a driver seat 13 to be described later, thereby defining a driver's cab in which an operator performs various operations. As shown in FIGS. 1 and 2, the cab 12 is formed as a box by a front surface portion 12A, a rear surface portion 12B, a left surface portion 12C, a right surface portion 12D, and a ceiling surface portion 12E, for example. The left side surface portion 12C is provided with an entrance 12F that is located closer to the front side and that an operator gets on and off. A door 12G is attached to the entrance 12F so as to be opened and closed.

  Further, as shown in FIGS. 2, 5, 6, etc., a mounting frame 12 </ b> H is provided at the lower end of the cab 12 so as to be bent inward. Then, the cab 12 mounts the mounting frame 12H on the periphery of the floor plate 8, passes the bolts 11 through a plurality of bolt insertion holes (not shown) formed in the mounting frame 12H, and each bolt 11 to the nut 8E. It is attached to the floor board 8 by screwing.

  A driver's seat 13 is located in the cab 12 and is provided near the rear side of the floor board 8. The driver's seat 13 is seated by an operator. Further, as shown in FIGS. 2, 3, etc., the driver's seat 13 is generally composed of a pedestal 14 to be described later mounted on the floor plate 8 and a seat 15 mounted on the pedestal 14.

  Reference numeral 14 denotes a pedestal serving as a base of the driver's seat 13, and the pedestal 14 is formed, for example, by bending a plate material into a U-shape. Further, the lower end portion of the pedestal 14 is an attachment flange portion 14A bent outward in the left and right directions. The pedestal 14 is placed on the center of the rear side of the floor board 8, and the bolts 11 are respectively passed through a plurality of, for example, four bolt insertion holes (not shown) formed in the left and right mounting flange portions 14A. The bolt 11 is attached to the floor board 8 by screwing it onto the nut 8E.

  Reference numeral 15 denotes a seat (illustrated in FIG. 2) mounted on the upper side of the pedestal 14 via a seating position adjusting mechanism or the like (not shown). The seat 15 is seated by an operator and has a seat portion 15A. And the backrest portion 15B.

  Reference numeral 16 denotes a left operation lever provided on the left side of the driver seat 13, and reference numeral 17 denotes a right operation lever provided on the left side of the driver seat 13. The left and right operation levers 16 and 17 are used to operate the working device 4 and the like, and a hydraulic pilot valve (both not shown) is operated by lever portions 16A and 17A. , 19 is used to drive a control valve (not shown).

  Reference numeral 18 denotes a plurality of hydraulic hoses as pipes for connecting the hydraulic pilot valve of the left operating lever 16 and the control valve. The hydraulic hoses 18 are arranged on the rear side of the driver's seat 13 from the hydraulic pilot valve of the left operating lever 16. It is connected to the hydraulic pilot part of the control valve through the hydraulic hose through hole 8C of the floor plate 8 located at the position.

  On the other hand, 19 is a plurality of hydraulic hoses as piping for connecting the hydraulic pilot valve and control valve of the right operating lever 17, and each hydraulic hose 19 is similar to the hydraulic hose 18 described above, and the right operating lever 17. The hydraulic pilot valve is connected to the hydraulic pilot portion of the control valve through the hydraulic hose through hole 8D of the floor plate 8 located on the right side of the driver's seat 13.

  Reference numeral 20 denotes two cooling water pipes as air conditioning pipes for supplying and discharging engine cooling water to and from a heater (not shown) of an air conditioning unit provided in the cab 12, and each of the cooling water pipes 20 includes: The heater of the air conditioning unit is connected to a water jacket (not shown) of the engine through an air conditioning piping through hole 8B of the floor plate 8 located on the right rear side of the driver's seat 13.

  Reference numeral 21 denotes two refrigerant pipes as air-conditioning pipes for supplying and discharging the refrigerant to and from the condenser (not shown) of the air-conditioning unit provided in the cab 12, and each of the refrigerant pipes 21 includes the cooling water described above. Similarly to the pipe 20 for the operation, the condenser of the air conditioning unit is connected to a refrigerant compressor (not shown) attached to the engine through the air conditioning pipe through hole 8B of the floor plate 8.

  2 are provided at the four corners of the floor plate 8 as shown in FIG. 2 and the like, for example, four vibration-proof mounts for attaching the floor plate 8 to the revolving frame 5 side. This reduces vibration and shock transmitted to the side. Here, among the four anti-vibration mounts 22, the anti-vibration mount 22 positioned on the right rear side is provided by sandwiching the floor plate 8 and a later-described reinforcing plate 23 as shown in FIG. 5.

  That is, the right rear anti-vibration mount 22 is attached from below to the cylindrical upper anti-vibration rubber 22A attached to the mount attachment hole 23G of the reinforcing plate 23 and the mount attachment hole 8A of the floor plate 8. A cylindrical lower vibration-proof rubber 22B, disk-shaped stoppers 22C and 22D provided so as to sandwich the vibration-proof rubbers 22A and 22B, the stoppers 22C and 22D, and the vibration-proof rubbers 22A and 22B. And a fixing bolt 22E which is provided through the center from above and is screwed onto the screw seat 5A of the swivel frame 5. On the other hand, the three anti-vibration mounts 22 other than the right rear anti-vibration mount 22 are provided with the floor plate 8 interposed therebetween, and are configured similarly to the right rear anti-vibration mount 22.

  23 is a reinforcing plate prepared separately from the floor plate 8, and the reinforcing plate 23 is shown in FIG. 2 when it is necessary to increase the strength of the floor plate 8 in the vicinity of the air conditioning piping through hole 8B and the hydraulic hose through hole 8D. In addition, it is additionally attached to the floor board 8. Further, as shown in FIG. 5, the reinforcing plate 23 is configured to be attached to the anti-vibration mount 22 located on the right rear side together with the floor plate 8.

  Specifically, as shown in FIGS. 4 and 7, the reinforcing plate 23 is formed in a shape surrounding the air conditioning piping passage hole 8 </ b> B and the hydraulic hose passage hole 8 </ b> D of the floor plate 8 using a strength member such as a steel plate, for example. By attaching to the right rear corner, the strength in the vicinity of the air conditioning piping through hole 8B and the hydraulic hose through hole 8D is increased. The reinforcing plate 23 can be additionally attached to the floor plate 8 even after the presser plate 10, the cab 12, and the driver's seat 13 are assembled to the floor plate 8.

  That is, the reinforcing plate 23 includes a wide front extending portion 23B extending forward from the corner corner portion 23A, a left extending portion 23C extending leftward from the corner corner portion 23A, and a left extending portion 23B extending from the corner corner portion 23A to the left extending portion. It is roughly constituted by an obliquely extending portion 23D extending obliquely between the extending portion 23C. Further, in the reinforcing plate 23, a notch 23E is formed between the front extension 23B and the oblique extension 23D, and a notch 23F is formed between the left extension 23C and the oblique extension 23D. In addition, a mount mounting hole 23G is formed in the corner portion 23A, and bolt insertion holes 23H are formed in the corner portion 23A, the front extension portion 23B, the left extension portion 23C, and the oblique extension portion 23D, respectively. .

  Here, the notch 23E between the front extension 23B and the oblique extension 23D is formed by notching a position corresponding to the hydraulic hose through hole 8D of the floor plate 8, and is formed between the left extension 23C and the oblique extension 23D. The notch 23F in the middle is formed by notching a position corresponding to the air conditioning piping through hole 8B of the floor board 8.

  Further, the mount mounting hole 23G of the corner corner 23A corresponds to the mount mounting hole 8A of the floor plate 8, and the bolt insertion holes 23H and 23H of the corner corner 23A and the left extension 23C are two pieces for fixing the cab 12. Corresponding to the nut 8E, the bolt insertion hole 23H of the front extension 23B corresponds to the nut 8E for fixing the presser plate 10, and the bolt insertion hole 23H of the oblique extension 23D to the nut 8E for fixing the pedestal 14. It corresponds.

  On the other hand, the reinforcing plate 23 has a plurality of spacers 24A, 24B, 24C located on the lower surface side facing the floor plate 8, as shown in FIGS. The spacer 24A for the cab is formed to have a thickness dimension substantially the same as the thickness dimension of the mounting frame 12H of the cab 12, and the front end of the front extension 23B so as to avoid the notch 23E from the periphery of the mount mounting hole 23G of the corner 23A. It extends to. The presser plate spacer 24B is formed to have a thickness that is substantially the same as the difference between the thickness of the cab spacer 24A and the thickness of the presser plate 10, and is provided on the distal end side of the forward extension 23B. . Furthermore, the pedestal spacer 24C is formed to have a thickness that is substantially the same as the difference between the thickness of the cab spacer 24A and the thickness of the mounting flange 14A of the pedestal 14, and is provided on the distal end side of the obliquely extending portion 23D. It has been.

  Each spacer 24 absorbs the step formed on the floor plate 8 by the mounting frame 12H of the cab 12, the presser plate 10, the mounting flange portion 14A of the base 14 and the like when the reinforcing plate 23 is attached to the floor plate 8. Thus, the reinforcing plate 23 is brought into close contact with the floor plate 8.

  Next, a procedure when the reinforcing plate 23 is additionally attached to the floor board 8 will be described. First, the fixing bolt 22E of the anti-vibration mount 22 located on the right rear side is loosened, and the upper stopper 22C and the upper anti-vibration rubber 22A are removed. Also, the mounting frame 12 </ b> H of the cab 12 is fixed to the periphery of the floor plate 8, two bolts 11 on the right rear side, one bolt 11 on the right side fixing the presser plate 10, and mounting of the base 14. Loosen and remove one bolt 11 on the right rear side that fixes the flange portion 14A. Thereby, the preparation for mounting the reinforcing plate 23 can be completed.

  Thus, when the reinforcement plate 23 is ready for attachment, the reinforcement plate 23 is placed on the right rear side of the floor plate 8. Then, the upper vibration-proof rubber 22 </ b> A and the like that have been removed are assembled in the mount mounting hole 23 </ b> G of the reinforcing plate 23, and the fixing bolt 22 </ b> E is fastened to the screw seat 5 </ b> A of the revolving frame 5. Further, the removed four bolts 11 are fastened to their original positions through the bolt insertion holes 23H of the reinforcing plate 23. Thereby, even after the cab 12, the driver's seat 13 and the like are assembled, the reinforcing plate 23 can be attached to the floor board 8 by a simple operation when reinforcement is required.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, the operation thereof will be described.

  First, an operator who opens the door 12G, gets into the cab 12 from the entrance 12F, and sits on the driver's seat 13 operates the traveling lever / pedal (not shown) to cause the lower traveling body 2 to travel. Further, by operating the operation lever 17, the work device 4 and the like can be operated to perform earth and sand excavation work and the like.

  At this time, work that exceeds the performance of the hydraulic excavator 1, for example, work that digs asphalt or the like while directly breaking it with the bucket of the work device 4, work that travels on an extremely rough road for a long time, front attachment that exceeds the specified weight (not shown) In the hydraulic excavator 1 in which it is considered that the operation is performed in a state in which the floor plate 8 is attached, the reinforcing plate 23 is added to the floor plate 8 to increase the strength of the floor plate 8 against the large vibration and impact at this time. be able to.

  Thus, according to the present embodiment, when it is necessary to increase the strength of the floor plate 8 near the air conditioning piping passage hole 8B and the hydraulic hose passage hole 8D, even after the driver's seat 13 or the like is assembled to the floor plate 8. The reinforcing plate 23 can be additionally attached to the floor plate 8, and the strength in the vicinity of the through holes 8B and 8D can be increased.

  As a result, when the floor plate 8 needs to be reinforced, the strength of the floor plate 8 can be increased. Therefore, the strength of the floor plate 8 can be increased with respect to a part of the excavator 1, and durability and reliability can be increased. Can be improved. In addition, most of the excavators 1 that do not require reinforcement can be manufactured as ordinary floor boards 8 that are not provided with the reinforcing plate 23, and therefore, it is not necessary to change the design and can be manufactured as usual.

  Further, since the reinforcing plate 23 is attached to the vibration isolating mount 22 together with the floor plate 8, the reinforcing plate 23 can receive an impact and vibration transmitted from the anti-vibration mount 22. Thereby, since the stress which acts on the floor board 8 can be made small, damage to the floor board 8 can be prevented, and reliability and durability can be improved.

  Further, the reinforcing plate 23 uses the bolts 11 used to mount the holding plate 10, the cab 12, and the pedestal 14 of the driver's seat 13 to the floor plate 8, and together with the holding plate 10, the cab 12 and the pedestal 14. Each bolt 11 can be used to attach to the floor board 8. This makes it possible to use the conventional bolt 11 and the nut 8E of the floor plate 8 without performing additional processing (welding, drilling, etc.) for attaching the reinforcing plate 23 to the floor plate 8 or preparing a separate bolt or the like. Thus, the reinforcing plate 23 can be easily attached, and the assembling workability can be improved and the manufacturing cost can be reduced.

  On the other hand, in the state where the reinforcing plate 23 is attached to the floor plate 8, the reinforcing plate 23 can surround the air conditioning piping through hole 8B and the hydraulic hose through hole 8D. Thereby, the intensity | strength around each through-hole 8B and 8D where a stress tends to concentrate can be raised effectively.

  Further, on the lower surface side of the reinforcing plate 23, a cab spacer 24A that absorbs a step due to the mounting frame 12H of the cab 12, a presser plate spacer 24B that absorbs a step due to the presser plate 10, and a mounting flange portion 14A of the base 14 are provided. Since the pedestal spacer 24C that absorbs the step is provided, even if a step is formed on the floor plate 8, the entire reinforcing plate 23 can be brought into close contact with the floor plate 8, and the strength of the floor plate 8 can be increased. It can be further increased.

  In the embodiment, the reinforcing plate 23 is described as being formed from a steel plate having the corner portion 23A, the forward extension portion 23B, the left extension portion 23C, and the oblique extension portion 23D. However, the present invention is not limited to this. For example, as in the modification shown in FIGS. 9 and 10, the reinforcing plate 31 includes a front member 32 having a front extension portion 32A and a diagonal extension portion 32B, and a corner portion 33A. And a rear member 33 having a left extension 33B, and an overlapping portion 32C of the front member 32 may be overlapped with the rear member 33 so that they are integrally attached.

  In the embodiment, the case where the cab 12 is formed as a box by the front surface portion 12A, the rear surface portion 12B, the left side surface portion 12C, the right side surface portion 12D, and the ceiling surface portion 12E has been described as an example. However, the present invention is not limited to this. For example, a cab formed in an arc shape from the left side surface to the rear surface, a cab formed in an arc shape from the front surface, the ceiling surface, and the rear surface, and a cab formed in a cylindrical shape as a whole. Etc., and can be applied widely.

  In the embodiment, the cab specification hydraulic excavator 1 on which the cab 12 formed as a box is mounted has been described as an example. However, the present invention is not limited to this. For example, the present invention may be applied to a canopy-type hydraulic excavator including a canopy that covers the upper side of the driver's seat.

  Furthermore, in the embodiment, the hydraulic excavator 1 is exemplified as the construction machine. However, the present invention is not limited to this, and can be widely applied to other construction machines such as hydraulic cranes, wheel loaders, and giraffes.

1 is a front view showing a hydraulic excavator according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of a state in which a reinforcing plate is attached to a floor board to which a cab, a driver's seat, and the like are assembled, as viewed from the direction of arrows II-II in FIG. It is a top view around the floor board which shows the handling of a hydraulic hose, cooling water piping, and refrigerant piping in the state where a cab was removed. It is a cross-sectional view of an enlarged main part showing a state in which a reinforcing plate is added and attached to the right rear side of the floor board. FIG. 5 is an enlarged longitudinal sectional view of a state in which the vibration proof mount is attached to the floor plate and the reinforcing plate as seen from the direction of arrows VV in FIG. 4. FIG. 5 is an enlarged longitudinal sectional view of a reinforcing plate attached to a floor board as viewed from the direction of arrows VI-VI in FIG. 4. It is a top view which expands a reinforcement plate and shows alone. It is the front view which looked at the reinforcement plate from the arrow VIII-VIII direction in FIG. It is a top view which shows the reinforcement plate by the modification of this invention alone. It is the front view which looked at the reinforcement plate from the arrow XX direction in FIG.

Explanation of symbols

1 Excavator (construction machine)
2 Lower traveling body (car body)
3 Upper swing body (car body)
4 Working device 8 Floor plate 8A Mount mounting hole 8B Air conditioning piping through hole (pipe through hole)
8C, 8D Hydraulic hose through hole (Pipe through hole)
8E Nut 9, 10 Presser plate 11 Bolt (fixing means)
12 cab 12A front surface portion 12B rear surface portion 12C left side surface portion 12D right side surface portion 12E ceiling surface portion 12F entrance / exit 12G door 12H mounting frame 13 driver's seat 14 pedestal 14A mounting flange portion 15 seat 16 left operation lever 17 right operation lever 18, 19 hydraulic hose ( Piping)
20 Cooling water piping (air conditioning piping)
21 Refrigerant piping (air conditioning piping)
22 Anti-vibration mount 23, 31 Reinforcement plate 24 Spacer

Claims (5)

A construction machine comprising a frame constituting a vehicle body, a floor plate provided on the frame, and a driver seat provided on the floor plate and seated by an operator, wherein the floor plate is provided with piping through holes through which various pipes are passed. In
In addition to the floor plate, a reinforcing plate for increasing the strength in the vicinity of the pipe through hole is prepared, and when it is necessary to increase the strength in the vicinity of the pipe through hole, the reinforcing plate is additionally attached to the floor plate. A featured construction machine.   The construction machine according to claim 1, wherein the floor plate is attached to the vehicle body side using a vibration-proof mount, and the reinforcing plate is attached to the vibration-proof mount together with the floor plate.   The construction machine according to claim 1 or 2, wherein a cab is attached to the floor board using a bolt, and the reinforcing plate is attached to the floor board together with the cab using the bolt.   Pipe through holes provided in the floor plate are connected to a hydraulic hose through hole through which a hydraulic hose connected to an operation lever provided on both the left and right sides of the driver's seat and an air conditioning unit that supplies conditioned air. The construction machine according to claim 1, 2, or 3, comprising air conditioning piping through holes through which air conditioning piping passes, wherein the reinforcing plate is configured to surround the hydraulic hose through holes and air conditioning piping through holes.   5. The construction machine according to claim 1, 2, 3, or 4, wherein the reinforcing plate is provided with a spacer having a thickness dimension adjusted according to a step of the mounting portion on the floor plate side.

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