JP2010265634A - Construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction machine capable of preventing heat and noise generated by an engine and hydraulic equipment from leaking out outside and improving the work environment of an operator and a worker around the machine. <P>SOLUTION: In this construction machine, a revolving frame 6 includes a shielding cover 26 being positioned between the equipment mounted in the machine such as the engine 7, a control valve 13 or the like and a tilt floor 16 and covering these equipment mounted in the machine to insulate heat and sound. In this case, since the shielding cover 26 being provided separately from the tilt floor 16 does not require the formation of a clearance for allowing the tilting operation, the shielding cover 26 can cover the engine 7, the control valve 13 or the like on the revolving frame 6 without forming a clearance to prevent heat and noise from leaking to the outside. Further, the shielding cover 26 has openings for work 27A, 27B, 29F, 29H to allow the worker to perform periodic maintenance work through these openings for work 27A, 27B, 29F, 29H. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to a construction machine in which an engine and a hydraulic device are mounted on a swing frame.

  Generally, a hydraulic excavator as a construction machine includes a small hydraulic excavator called a mini excavator. The small hydraulic excavator includes a lower traveling body capable of self-propelling, an upper revolving body that is turnably mounted on the lower traveling body, and a working device that is provided so as to be able to move up and down on the front side of the upper revolving body. It is comprised by.

  The upper swing body includes a swing frame provided with a working device on the front side, an engine mounted on the rear side of the swing frame and driving a hydraulic pump, a floor provided on the swing frame, A driver seat that is provided on the upper side and on which an operator sits is roughly configured.

  Here, in the small hydraulic excavator, since the upper swing body is also formed in a small size, it is difficult to secure an installation space for a mounted device such as an engine. For this purpose, the rear side of the floor is extended to the upper side of the engine, and a driver's seat is arranged on the floor so as to be positioned above the engine. In addition, hydraulic equipment such as a control valve is disposed on the revolving frame using the space below the footrest located on the front side of the floor.

  The floor covering the engine, control valve, etc. is configured as a tilt floor that can be tilted on the turning frame with the front side of the turning frame as a fulcrum so that maintenance work can be performed on the engine, control valve, etc. (For example, refer to Patent Document 1).

JP-A-2005-48380

  By the way, in the hydraulic excavator according to Patent Document 1 described above, by lifting the rear side of the floor and tilting up, the entire engine, control valve, and the like can be exposed, and maintenance work can be performed in this fully opened state. .

  However, since the engine becomes high temperature, it is necessary to provide a protective cover that covers the high temperature part so as not to touch it directly during work. Therefore, there are problems that the number of parts increases and that the assembling work is time-consuming.

  In addition, it is necessary to secure a gap between the tilt floor and the surrounding members so that the tilt floor does not come into contact with the surrounding members during the tilting operation. Decreases. For this reason, heat and noise generated by the engine, the control valve, etc. leak from the gap, which is a factor of deteriorating the working environment of the operator and surrounding workers.

  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 prevent the heat and noise generated by the engine and hydraulic equipment from leaking to the outside, and the operation of the operator and surrounding workers. It is to provide a construction machine that can improve the environment.

  Another object of the present invention is to provide a construction machine in which a protective cover attached to a high temperature part such as an engine is omitted, and the number of parts can be reduced to improve the assembly workability.

  A construction machine according to the present invention includes a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a working device that is provided on the front side of the upper revolving body so as to be able to move up and down. The upper revolving structure comprises a revolving frame that forms a support structure, a mounted device that includes an engine and a hydraulic device mounted on the revolving frame, and a front side of the revolving frame that is positioned above the mounted device. And a tilt floor having a driver's seat on which the operator is seated.

  And in order to solve the above-mentioned subject, the feature of the composition adopted by the invention of claim 1 is that the revolving frame is located between the mounted device and the tilt floor and is insulated so as to cover the mounted device. There is a configuration in which a shielding cover for sound insulation is provided.

  According to a second aspect of the present invention, the shielding cover is provided so as to be attached to and detached from the revolving frame.

  According to a third aspect of the present invention, the tilt floor is formed by a footrest portion that is positioned on the front side and on which an operator puts a foot, and a rising portion that rises from the rear portion of the footrest portion, and the shielding cover includes a front side And a front shielding plate portion that faces the footrest portion and covers the hydraulic device, and a vertical shielding plate portion that faces the rising portion and rises and covers a part of the engine.

  According to a fourth aspect of the present invention, the shielding cover is provided with a work opening for performing maintenance work on the mounted device, and a cover for closing the work opening is attached and detachable. It is in.

  According to a fifth aspect of the present invention, the cover body of the shielding cover is provided with a claw portion that engages with the inner edge portion of the work opening, and the cover body engages the claw portion with the inner edge portion of the work opening. In this state, the fastening member is used to fix the shielding cover.

  According to the first aspect of the present invention, since the shielding cover provided separately from the tilt floor does not need to provide a gap for allowing the tilting operation, the mounted device on the turning frame can be covered without a gap. As a result, it is possible to prevent heat and noise generated by the engine, hydraulic equipment, etc. from leaking to the outside, and to improve the working environment of the operator and surrounding workers.

  When the tilt floor is lowered onto the shielding cover, a double partition wall can be formed by the tilt floor and the shielding cover, and an air layer is formed between the tilt floor and the shielding cover. be able to. Thereby, the heat and noise which an engine and hydraulic equipment generate | occur | produce with a double partition and an air layer can be shielded reliably.

  According to the invention of claim 2, in a state where the shielding cover is attached to the turning frame, it is possible to shield heat and noise generated by the engine, hydraulic equipment and the like. Further, by removing the shielding cover from the revolving frame, it is possible to perform inspection work, maintenance work, and the like on the mounted equipment such as the engine and hydraulic equipment.

  According to the invention of claim 3, the operating sound and heat of the hydraulic device can be blocked by the dual structure of the footrest portion of the tilt floor and the front shielding plate portion of the shielding cover. Further, the engine operating sound and heat can be blocked by the double structure of the rising part of the tilt floor and the vertical shielding plate part of the shielding cover.

  According to the fourth aspect of the present invention, the work opening can be opened by removing the lid from the shielding cover, and the maintenance work of the mounted equipment can be performed by the work opening. At the time of this maintenance work, only a necessary part can be opened by the work opening, so that the high temperature part of the engine can be kept covered. As a result, the protective cover covering the high temperature part of the engine can be omitted, the number of parts can be reduced, and the assembly workability can be improved. Further, by attaching a lid to the shielding cover, the work opening can be closed, and heat and noise generated by the engine and hydraulic equipment can be prevented from leaking to the outside.

  According to the invention of claim 5, the lid can be easily attached to the shielding cover by a small number of fastening members by engaging the claw portion with the inner edge portion of the working opening and fastening the fastening member in this state. It is possible to improve the assembly workability.

1 is a front view showing a canopy-spec hydraulic excavator according to a first embodiment of the present invention. It is an external appearance perspective view which expands and shows an upper revolving body in the state which abbreviate | omitted the canopy. It is an external appearance perspective view which shows the upper turning body which tilted up the tilt floor. It is a top view which expands and shows a turning frame, a counterweight, various mounting apparatuses, etc. It is a front view shown in the state which separated the tilt floor and shielding cover of an upper revolving structure. It is a partially broken front view showing a turning frame, an engine, a tilt floor, a shielding cover, a counterweight, and the like. It is an external appearance perspective view which shows the upper turning body which abbreviate | omitted the upper side from the tilt floor. It is an external appearance perspective view of the upper turning body shown in the state where the lid in FIG. 7 is removed. It is an external appearance perspective view which shows a shielding cover alone. FIG. 10 is a right side view of the shielding cover shown in FIG. 9. It is a disassembled perspective view of the shielding cover which shows the state which removed each cover body. It is a principal part expanded sectional view of the shielding cover seen from the arrow XII-XII direction in FIG. It is a principal part expanded sectional view of the shielding cover by the 2nd Embodiment of this invention. It is an external appearance perspective view which shows the shielding cover by the modification of this invention alone.

  Hereinafter, a small hydraulic excavator will be described as a representative example of a construction machine according to an embodiment of the present invention, and will be described in detail with reference to the accompanying drawings.

  First, FIGS. 1 to 12 show a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a canopy-type hydraulic excavator as a construction machine. The hydraulic excavator 1 turns on a self-propelled crawler type lower traveling body 2 and a swiveling device 3 on the lower traveling body 2. The upper swivel body 4 is mounted in a slidable manner, and the swing-type working device 5 is provided on the front side of the upper swivel body 4 so as to be swingable and can be raised and lowered in order to perform excavation work of earth and sand. .

  Further, as shown in FIGS. 2 to 4, the upper swing body 4 is roughly constituted by a swing frame 6, an engine 7, a swing motor 12, a control valve 13, a tilt floor 16, a driver seat 21, a shielding cover 26 and the like which will be described later. ing.

  Reference numeral 6 denotes a revolving frame constituting a support structure for the upper revolving structure 4. As shown in FIG. 4, the swivel frame 6 has a flat bottom plate 6A extending in the front and rear directions in the middle in the left and right directions, and spaced apart in the left and right directions on the upper surface side of the bottom plate 6A. Left and right vertical plates 6B and 6C erected in a C-shape, a support bracket 6D provided at the front end of each of the vertical plates 6B and 6C, and a base of the support bracket 6D A left side frame 6E that is bent while extending to the left side from the end portion and extended to the rear side, a right side frame 6F that is bent while extending to the right side from the base end portion of the support bracket 6D and extends to the rear side, and a front portion A left beam extending leftward and rightward above the left side frame 6E, located on the left side, and extending from the left end of the front beam 6G to the rear side. 6H. Further, the front beam 6G, the left beam 6H, and the like are attached so that the periphery of a shielding cover 26 described later can be attached and removed.

  Reference numeral 7 denotes an engine as a mounted device mounted on the rear side of the revolving frame 6, and the engine 7 is disposed in a horizontally placed state extending leftward and rightward with respect to the upper revolving body 4. A hydraulic pump 8 that discharges pressure oil toward actuators such as the lower traveling body 2 and the work device 5 is attached to the left side of the engine 7. On the other hand, a heat exchanger 9 including a radiator, an oil cooler, and the like is disposed on the right side of the engine 7. The front side and the upper side of the engine 7 are covered with a vertical shielding plate portion 29 of a shielding cover 26 described later.

  Further, the engine 7 is provided with an exhaust pipe 7A located at an upper portion on the center front side, and an exhaust gas aftertreatment device 7B such as a silencer, an exhaust gas purification device or the like is connected to a tip portion of the exhaust pipe 7A. ing. On the other hand, an alternator (generator) 7C for power generation is provided at an upper position on the right front side of the engine 7, and the alternator 7C opens the upper work opening by removing a lid 29J of a vertical shielding plate part 29 described later. Maintenance work such as inspection work and maintenance work can be performed via 29H. Furthermore, a starter device 7D for starting the engine 7 is provided at a lower position on the center front side of the engine 7, and the starter device 7D can perform a lower work by removing the lid 29G of the vertical shielding plate portion 29. Maintenance work can be performed through the opening 29F.

  A hydraulic oil tank 10 is provided on the right side of the revolving frame 6 and is located on the front side of the heat exchanger 9. The hydraulic oil tank 10 stores hydraulic oil supplied to the hydraulic pump 8. Reference numeral 11 denotes a fuel tank disposed on the front side of the hydraulic oil tank 10, and the fuel tank 11 stores fuel to be supplied to the engine 7.

  Reference numeral 12 denotes a turning motor as a hydraulic device provided near the center of the bottom plate 6A of the turning frame 6. The turning motor 12 serves as a drive source for the turning device 3 described above. Further, the turning motor 12 is covered with a front shielding plate part 27 described later, and a maintenance work can be performed through the right work opening 27B by removing the lid 27D.

  Reference numeral 13 denotes a control valve as a hydraulic device mounted on the turning frame 6 and positioned on the left side of the left vertical plate 6B. The control valve 13 is formed by a plurality of hydraulic pilot type spool valves. A plurality of hydraulic hoses 13 </ b> A are connected to the control valve 13. The control valve 13 and each hydraulic hose 13A can perform maintenance work through the left work opening 27A by removing the lid 27C of the front shielding plate part 27.

  Reference numeral 14 denotes a counterweight located on the rear side of the engine 7 and attached to the rear end portion of the revolving frame 6. The counterweight 14 balances the weight with the work device 5 and has a convex curved shape extending in an arc shape in the left and right directions. Further, as shown in FIG. 6, the counterweight 14 serves as an attachment base for attaching a building attachment portion 19 of the tilt floor 16 and a vertical shielding plate portion 29 of the shielding cover 26 described later.

  15 is an exterior cover provided around the tilt floor 16, and the exterior cover 15 includes a left side cover 15A extending forward from the left end side of the counterweight 14, as shown in FIGS. A left skirt cover 15B provided so as to cover the periphery of the revolving frame 6 from the tip of the left side cover 15A, a right side cover (not shown) extending forward from the right end side of the counterweight 14, and the right side cover A right skirt cover 15C provided so as to cover the periphery of the swivel frame 6 from the front end thereof, and a rear cover 15D provided on the rear side so as to be openable and closable between the side cover 15A and covering the engine 7 from the rear side. The tank cover 15E that can be opened and closed is located on the right side and covers the hydraulic oil tank 10 and the like.

  Reference numeral 16 denotes a tilt floor provided on the revolving frame 6. As shown in FIG. 3, the tilt floor 16 is provided to be tiltable on the turning frame 6 with the front side of the turning frame 6 as a fulcrum. As shown in FIG. 6, the tilt floor 16 is supported by a front beam 6 </ b> G whose front position is a front position of the revolving frame 6 via a floor support mechanism 20 described later, and the rear position is on the counterweight 14. It is detachably attached via a vibration-proof mount (not shown). Thereby, the tilt floor 16 is disposed above the engine 7, the turning motor 12, the control valve 13, and the like, and covers these mounted devices.

  Further, as shown in FIGS. 5, 6, and the like, the tilt floor 16 includes a footrest portion 17 serving as a footrest for an operator who is positioned on the front side and seated on a driver seat 21 described later, and a rear portion of the footrest portion 17. The rising portion 18 that covers the upper side from the front side of the rising engine 7 and the building mounting portion 19 that extends from the upper end portion of the rising portion 18 to the rear side.

  Here, a lever / pedal mounting plate 17A for mounting a travel operation lever / pedal 23 and the like, which will be described later, is provided at the front side position of the footrest portion 17 so as to extend in the left and right directions. A front bracket 17B is provided on the front side. Further, the rising portion 18 extends from the rear side of the footrest portion 17 to the upper side and is positioned on the front side of the engine 7, and a driver seat mounting plate that forms a top plate extending from the upper side of the front plate 18A to the rear side. 18B.

  Further, the tilt floor 16 serves as a partition wall between equipment mounted on the turning frame 6, for example, the engine 7, the turning motor 12, the control valve 13, and an operator seated on a driver seat 21 described later. The tilt floor 16 can make it difficult for the heat and noise of the engine 7, the turning motor 12, and the control valve 13 to be transmitted to the operator side in cooperation with a shielding cover 26 described later.

  A floor support mechanism 20 is provided between the front beam 6G of the swivel frame 6 and the front bracket 17B of the footrest portion 17 so as to be separated left and right (only one is shown in FIG. 6). The left and right floor support mechanisms 20 are attached so that the axis extending in the left and right directions at the front side position of the tilt floor 16 is a rotation axis, and the front side of the tilt floor 16 is rotatably (tilted) to the revolving frame 6. Is. Thereby, as shown in FIG. 1, the tilt floor 16 can be tilted in the direction indicated by arrow A (tilt up) from the front side or the upper side (tilt up) and from the direction indicated by arrow B (tilt down) from the rear side or the lower side. Yes.

  Reference numeral 21 denotes a driver seat provided on the driver seat mounting plate 18B of the rising portion 18 of the tilt floor 16 (see FIG. 1 and the like). The driver seat 21 is seated by an operator. Further, on both the left and right sides of the driver's seat 21, as shown in FIGS. 1 and 2, work operation levers 22 for operating the turning device 3, the work device 5, and the like are disposed. The lever / pedal mounting plate 17A of the footrest 17 in front of the driver's seat 21 is provided with a travel operation lever / pedal 23 that is operated manually or by stepping when the lower traveling body 2 is traveled. Yes. Further, a monitor device 24 is provided on the right side of the travel operation lever / pedal 23 so as to face the operator.

  Reference numeral 25 denotes a canopy as a building provided on the tilt floor 16. The canopy 25 covers the upper side of the driver seat 21. As shown in FIG. 1, the canopy 25 includes a left and right front pillar 25A, a left and right rear pillar 25B (both shown only on the left side), and a roof portion 25C. The front portion of the canopy 25 is attached to the front bracket 17B of the footrest portion 17 of the tilt floor 16, and the rear portion is attached to the building attachment portion 19.

  Next, the configuration of the shielding cover 26 according to the first embodiment provided on the revolving frame 6 side separately from the tilt floor 16 will be described.

  That is, reference numeral 26 denotes a shielding cover provided on the revolving frame 6 located below the tilt floor 16. As shown in FIG. 6, the shielding cover 26 is positioned on the upper side to cover the engine 7, the turning motor 12, the control valve 13, etc. constituting the mounted device, and is tilted with the engine 7, the turning motor 12, the control valve 13, etc. It is arranged between the floor 16. Further, the shielding cover 26 is attached to the revolving frame 6 and the counterweight 14 which is a support structure on the revolving frame 6 side so as to be removable.

  The shielding cover 26 according to the first embodiment covers the engine 7, the turning motor 12, the control valve 13, etc. constituting the mounted equipment without gaps as shown in FIG. Is to block. Further, as shown in FIGS. 9 and 10, the shielding cover 26 is formed of a metal plate, and includes two members, a front shielding plate portion 27 and a vertical shielding plate portion 29 described later.

  Reference numeral 27 denotes a front shielding plate portion that forms a front portion of the shielding cover 26, and the front shielding plate portion 27 covers the upper side of the swing motor 12, the control valve 13, and the like as hydraulic equipment without any gaps. Further, the front shielding plate portion 27 is located on the front side and faces the footrest portion 17 of the tilt floor 16. The front shielding plate portion 27 is made of a substantially rectangular metal plate, and as shown in FIG. 7, the surrounding structure is provided on the front beam 6G, the left beam 6H, and the other revolving frame 6 of the revolving frame 6. It is attached to the body using a plurality of bolts 28 so as to be removable.

  Further, as shown in FIG. 8, the front shielding plate portion 27 is formed with a rectangular left working opening 27 </ b> A positioned above the control valve 13, and is positioned above the swing motor 12. A right working opening 27B is formed. These openings 27 </ b> A and 27 </ b> B expose only parts where maintenance work such as inspection work and maintenance work needs to be performed, and are openings for performing maintenance work of the control valve 13 and the turning motor 12, for example. .

  Further, as shown in FIG. 12 and the like, the front shielding plate portion 27 is provided with a lid body 27C that closes the left work opening 27A. The lid body 27C uses a plurality of bolts 28 for the left work. It is attached around the opening 27A and is detachably attached. Further, as shown in FIGS. 9 and 11, the front shielding plate portion 27 is provided with a lid body 27D for closing the right working opening 27B. The lid body 27D is attached by using a plurality of bolts 28. Removably mounted.

  Reference numeral 29 denotes a vertical shielding plate portion that forms a rear portion of the shielding cover 26. As shown in FIGS. 6 to 9, the vertical shielding plate portion 29 includes a vertical plate 29A rising from the rear portion of the front shielding plate portion 27, and a horizontal plate 29B extending rearward from the upper portion of the vertical plate 29A. A rear plate 29C extending obliquely upward from the rear portion of the horizontal plate 29B, a rear mounting plate 29D extending rearward from the upper portion of the rear plate 29C, and the vertical plate positioned on the right side of the horizontal plate 29B. The inclined plate 29E extends obliquely across the rear portion of 29A and the front portion of the rear mounting plate 29D.

  The vertical plate 29A covers the front side of the engine 7, and a rectangular lower work opening 29F elongated in the left and right directions is formed at the center lower side position corresponding to the starter device 7D of the engine 7. Has been. The vertical plate 29A is provided with a lid 29G for closing the lower work opening 29F. The lid 29G can be attached to and removed from the lower work opening 29F using a plurality of bolts 28. Installed.

  On the other hand, the horizontal plate 29B and the inclined plate 29E cover the upper side of the engine 7, and the inclined plate 29E corresponding to the alternator 7C of the engine 7 has a rectangular upper work opening 29H that is long in the front and rear directions. Is formed. Further, the inclined plate 29E is provided with a lid 29J that closes the upper work opening 29H, and the cover 29J can be attached to and removed from the upper work opening 29H using a plurality of bolts 28. Installed.

  The vertical shielding plate portion 29 is integrally bolted to the rear portion of the front shielding plate portion 27 at the lower portion of the vertical plate 29A located on the front side. Further, the rear mounting plate 29D positioned on the rear side of the vertical shielding plate portion 29 is attached to the upper portion of the counterweight 14 and is bolted so as to be removable.

  Thus, the shielding cover 26 fixedly attached to the revolving frame 6 side can cover the revolving motor 12 and the control valve 13 without any gaps by the front front shielding plate portion 27. In addition, the engine 7 and the hydraulic pump 8 can be covered with the rear vertical shielding plate portion 29 without any gap. On the other hand, work openings 27A, 27B, 29F, and 29H that are normally closed by the lid bodies 27C, 27D, 29G, and 29J are provided at positions corresponding to devices that require maintenance work such as inspection work and maintenance work. Therefore, normal maintenance work can be performed by removing the lids 27C, 27D, 29G, and 29J.

  Reference numeral 30 denotes a transverse sheet member for heat insulation and sound insulation provided on the lower surface side of the front shielding plate portion 27 facing the turning motor 12 and the control valve 13. The horizontal sheet member 30 is provided so as to cover the lower surface of the front shielding plate portion 27. The horizontal seat member 30 absorbs heat and noise generated by the turning motor 12 and the control valve 13, thereby blocking the heat and noise from being transmitted to the operator and surrounding workers.

  Reference numeral 31 denotes a vertical sheet member provided on the rear surface side and the lower surface side of the vertical shielding plate portion 29 facing the engine 7. The vertical sheet member 31 is provided so as to cover the rear surface of the vertical plate 29A of the vertical shielding plate portion 29 and the lower surface of the horizontal plate 29B. The vertical sheet member 31 absorbs heat and noise generated by the engine 7 so as to prevent the heat and noise from being transmitted to the operator and surrounding workers.

  Reference numeral 32 denotes an air layer formed between the tilt floor 16 and the shielding cover 26 (see FIG. 6). The air layer 32 is formed between the tilt floor 16 and the shielding cover 26 by forming a double partition when the tilt floor 16 is lowered onto the shielding cover 26 (tilt down). Space. And since the air layer 32 has a heat insulation and a sound insulation function, the heat and noise which the engine 7, the turning motor 12, the control valve 13, etc. generate | occur | produce can be shielded.

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

  First, the operator seated in the driver's seat 21 can drive the lower traveling body 2 by operating the traveling operation lever / pedal 23. Further, by operating the left and right work operation levers 22, the turning device 3 and the work device 5 can be driven to perform excavation work of earth and sand.

  Here, when the hydraulic excavator 1 is traveling and working, the engine 7 provided on the rear side of the swing frame 6 is in an operating state, and the engine 7 generates heat and generates noise (vibration). Similarly, the turning motor 12 and the control valve 13 also generate heat due to a rise in the temperature of the hydraulic oil and generate an operation sound.

  In this case, a shielding cover 26 is provided on the lower side of the tilt floor 16 on which the driver's seat 21 is mounted separately from the tilt floor 16 so that the shielding cover 26 can be attached to the revolving frame 6 without a gap. it can. Further, a double partition wall can be formed by the tilt floor 16 and the shielding cover 26. Further, an air layer 32 in which heat and vibration are not easily transmitted can be formed between the tilt floor 16 and the shielding cover 26. Further, the shielding cover 26 is provided with sheet members 30 and 31 for sound insulation and heat insulation. Therefore, heat and noise generated by the engine 7, the turning motor 12, the control valve 13, and the like are blocked by the sealing structure of the shielding cover 26, the heat insulating and sound insulating seat members 30, 31, and the air layer 32 where heat and sound are not easily transmitted. be able to.

  Next, a case where maintenance work is performed on the engine 7, the turning motor 12, the control valve 13, and the like will be described.

  In this case, the bolt or the like that attaches the building mounting portion 19 of the tilt floor 16 to the counterweight 14 is removed, and the tilt floor 16 or the like is moved by the tilt mechanism (not shown) with the front floor support mechanism 20 as a fulcrum. Tilt up in the direction indicated by A (state shown in FIG. 3).

  As a result, since the shielding cover 26 is exposed, when the maintenance work is performed on the alternator 7C of the engine 7, the bolt 28 is loosened and the lid 29J of the vertical shielding plate portion 29 is removed as shown in FIG. Thereby, the maintenance work can be performed on the alternator 7C through the upper work opening 29H. Further, the starter device 7D of the engine 7 can perform maintenance work through the lower work opening 29F by removing the lid 29G of the vertical shielding plate part 29.

  On the other hand, the turning motor 12 can perform maintenance work through the right work opening 27B by removing the lid 27D of the front shielding plate part 27. Further, the control valve 13 can perform maintenance work through the left work opening 27A by removing the cover 27C of the front shielding plate part 27.

  Here, when maintenance work is performed on the alternator 7C, the starter device 7D, the swing motor 12, and the control valve 13 of the engine 7, only necessary portions are exposed, and therefore the exhaust pipe 7A of the engine 7 that becomes high temperature, etc. Can be kept covered by the shielding cover 26 so that the operator does not touch it.

  Further, the alternator 7C, the starter device 7D, the turning motor 12, and the control valve 13 of the engine 7, the maintenance work of other equipment, the replacement work, and the like are performed only by the respective work openings 27A, 27B, 29F, and 29H. Is difficult. Therefore, the shielding cover 26 is removed by loosening the bolts 28 that attach the shielding cover 26 to the revolving frame 6 and the counterweight 14. As a result, the engine 7, the turning motor 12, and the control valve 13 can be widely opened, and equipment replacement work, maintenance work of equipment disposed in a deep position, and the like can be performed.

  When the various operations are completed, the maintenance work is completed by tilting down the tilt floor 16 and the like in the direction of arrow B by the tilt mechanism and fixing the building mounting portion 19 of the tilt floor 16 to the counterweight 14. Can do.

  Thus, according to the first embodiment, the swing frame 6 is provided between the mounted device such as the engine 7, the swing motor 12, and the control valve 13 and the tilt floor 16 and covers the mounted devices. The sound shielding cover 26 is provided. In this case, since the shielding cover 26 provided separately from the tilt floor 16 does not need to provide a gap for allowing the tilting operation, it covers the engine 7, the turning motor 12, and the control valve 13 on the turning frame 6 without any gap. be able to.

  As a result, heat and noise generated by the engine 7, the turning motor 12, the control valve 13, and the like can be prevented from leaking to the outside, and the working environment of the operator and surrounding workers can be improved.

  In addition, when the tilt floor 16 is lowered onto the shielding cover 26, a double partition wall can be formed by the tilt floor 16 and the shielding cover 26, and between the tilt floor 16 and the shielding cover 26. Can form an air layer 32. Thereby, the double partition wall and the air layer 32 can reliably shield the heat and noise generated by the engine 7, the control valve 13, and the like.

  On the other hand, when maintenance work is performed on the mounted devices such as the alternator 7C, the starter device 7D, the turning motor 12, and the control valve 13 of the engine 7, the openings 27A, 27B, 29F, and 29H for the shielding cover 26 are opened. As a result, maintenance work for each mounted device can be performed.

  In addition, when performing maintenance work, only the necessary portions can be opened by the respective work openings 27A, 27B, 29F, and 29H, so that the exhaust pipe 7A and the like of the engine 7 that is at a high temperature remain covered. can do. As a result, the protective cover necessary to cover the high temperature part of the engine 7 can be omitted, and the number of parts can be reduced to improve the assembly workability.

  Furthermore, since the shielding cover 26 is attached to the revolving frame 6 using the bolts 28 and is detachably attached, when performing a large-scale replacement work or a maintenance work for a device placed in a deep position, The entire shielding cover 26 can be removed. As a result, the engine 7, the turning motor 12, the control valve 13, and the like can be widely opened, and equipment replacement work, maintenance work of equipment disposed in a recessed position, and the like can be performed.

  Next, FIG. 13 shows a second embodiment of the present invention. The feature of this embodiment is that the cover body of the shielding cover is provided with a claw portion that engages with the inner edge portion of the work opening, and the cover body has the claw portion engaged with the inner edge portion of the work opening. In this state, the fastening member is used to fix the shield cover. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In FIG. 13, reference numeral 41 denotes a front shielding plate portion according to the second embodiment. The front shielding plate portion 41 includes a left work opening 41A, a lid body 41B, a right work opening, and a lid body (both shown in FIG. 13). And at least one bolt 42.

  Here, the lid 41B of the front shielding plate 41 is provided with a claw portion 41B1 that engages with the inner edge portion of the left working opening 41A. Accordingly, one of the lid members 41B in the length direction can be engaged with the inner edge portion of the left work opening 41A by using the claw portion 41B1, and thus the bolt 42 having the other in the length direction as a fastening member can be used. The lid 41 </ b> B can be attached to the front shielding plate 41 simply by using and fixing.

  Thus, also in the second embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. In particular, according to the second embodiment, the lid 41B of the front shielding plate 41 is provided with a claw 41B1 that engages with the inner edge of the left working opening 41A on one side in the length direction. did. Therefore, the other of the lid body 41B in the length direction can be fixed using at least one bolt 42, and the fastening work can be omitted to improve the assembly workability. Further, this configuration can be similarly applied to the right work opening, the lower work opening, and the upper work opening.

  In the first embodiment, the case where the shielding cover 26 includes the two front shielding plate portions 27 and the vertical shielding plate portion 29 made of a metal material has been described as an example. However, the present invention is not limited to this, and the shielding cover 51 may be formed using a resin material as in the modification shown in FIG. In this case, the shielding cover 51 is positioned on the front side and faces the footrest portion 17 and covers the control valve 13 and the like, and the shielding cover 51 faces the rising portion 18 and covers a part of the rising engine 7. The vertical shielding plate 53 can be integrally formed. The vertical shielding plate 53 is formed by a vertical plate 53A covering the front side, a horizontal plate 53B extending from the top of the vertical plate 53A to the rear side, a back plate 53C, a rear mounting plate 53D, and an inclined plate 53E. do it. Each lid 53F, 53G, 53H, 53J can also be formed using a resin material. This configuration can be similarly applied to the second embodiment.

  In the first embodiment, the tilt floor 16 is stepped by the front footrest portion 17 and the rising portion 18 that rises from the rear portion of the footrest portion 17 and covers the upper side from the front side of the engine 7. The driver seat 21 is mounted on the driver seat mounting plate 18B of the rising portion 18. However, the present invention is not limited to this. For example, by forming the footrest portion to the rear side, a driver seat support base is provided at a position closer to the rear side of the footrest portion, and driving on the driver seat support base is performed. It may be configured to attach a seat.

  Further, in the first embodiment, several mounted devices that require maintenance work such as periodic inspection work and maintenance work are illustrated, and specific examples thereof include the front shielding plate portion 27 of the shielding cover 26. Is provided with a left work opening 27A for carrying out maintenance work on the control valve 13 and a right work opening 27B for carrying out maintenance work on the turning motor 12, and the vertical shielding plate 29 is provided with a starter for the engine 7. The case where the lower work opening 29F for performing the maintenance work on the apparatus 7D and the upper work opening 29H for performing the maintenance work on the alternator 7C is illustrated.

  However, the present invention is not limited to this, and an opening corresponding to any one of the control valve 13, the turning motor 12, the starter device 7D of the engine 7, and the alternator 7C may be provided. Moreover, it is good also as a structure which provides the other opening for performing a maintenance operation | work to other mounted apparatuses. This configuration can be similarly applied to the second embodiment.

  On the other hand, in each embodiment, the canopy type hydraulic excavator 1 including the canopy 25 that covers the upper side of the driver's seat 21 with the plurality of pillars 25A and 25B and the roof portion 25C is described as an example of the construction machine. However, the present invention is not limited to this, and may be applied to, for example, a cab type hydraulic excavator provided with a cab that covers the periphery and upper side of the driver's seat.

  Furthermore, in each embodiment, the crawler type hydraulic excavator 1 has been described as an example of the construction machine. However, the present invention is not limited to this, and for example, an engine such as a wheel type hydraulic excavator, a hydraulic crane, or a hydraulic device is provided. It can be widely applied to other construction machines equipped.

1 Excavator (construction machine)
2 Lower traveling body 3 Turning device 4 Upper turning body 5 Working device 6 Turning frame 7 Engine (equipment)
7A Exhaust pipe 7C Alternator 7D Starter device 8 Hydraulic pump 12 Rotating motor (hydraulic equipment)
13 Control valve (hydraulic equipment)
16 Tilt floor 17 Footrest 18 Rise 21 Driver's seat 26, 51 Shield cover 27, 41, 52 Front shield 27A, 41A Left work opening 27B Right work opening 27C, 27D, 29G, 29J, 41B, 53F ~ 53J Lid 28,42 Bolt (fastening member)
29, 53 Vertical shield plate 29A, 53A Vertical plate 29B, 53B Horizontal plate 29E, 53E Inclined plate 29F Lower work opening 29H Upper work opening 32 Air layer 41B1 Claw

Claims (5)

A self-propelled lower traveling body, an upper revolving body mounted on the lower traveling body so as to be able to swivel, and a working device provided on the front side of the upper revolving body so as to be able to move up and down,
The upper revolving structure includes a revolving frame forming a support structure, a mounted device including an engine and a hydraulic device mounted on the revolving frame, and a front side of the revolving frame positioned above the mounted device. In a construction machine comprising a tilt floor having a driver's seat on which an operator is seated so as to be tiltable on the swivel frame,
A construction machine characterized in that the revolving frame is provided with a heat insulating and sound insulating shielding cover that is positioned between the mounted device and the tilt floor to cover the mounted device.   The construction machine according to claim 1, wherein the shielding cover is configured to be attached to and removable from the revolving frame. The tilt floor is formed by a footrest portion on the front side where an operator puts his / her foot, and a rising portion rising from the rear portion of the footrest portion,
The shielding cover is formed by a front shielding plate portion that is located on the front side and faces the footrest portion and covers the hydraulic device, and a vertical shielding plate portion that rises facing the rising portion and covers a part of the engine The construction machine according to claim 1 or 2.   4. The structure according to claim 1, 2 or 3, wherein the shielding cover is provided with a work opening for performing maintenance work of the mounted device, and a cover for closing the work opening is attached and removable. The construction machine described.   The cover body of the shielding cover is provided with a claw portion that engages with the inner edge portion of the work opening, and the cover body is a fastening member with the claw portion engaged with the inner edge portion of the work opening. The construction machine according to claim 4, wherein the construction machine is configured to be fixed to the shielding cover.

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