JP2007285003A - Construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a vertically elongated handrail to be arranged in a position not to be a hindrance to the opening/closing of an openable/closable door, even if the door is provided on the left side of a utility room. <P>SOLUTION: In a handrail 30 for getting on and off construction machinery, which is provided in a left rear corner position of a front utility cover 24, a vertical pipe part 30A elongated in a vertical direction is arranged in a position to deviate from a range of a locus 28 in the opening/closing of an intermediate door 23, and a range of a locus 29 in the opening/closing of a front-side door 27. Thus, the handrail 30, which is gripped when a person gets on/off a side step 12, can be provided on the left side of the utility cover 24, so that the person can easily and safely get on/off. Additionally, the intermediate door 23 and the front-side door 27 can be opened wide without being inhibited by the handrail 30, so that the workability of inspection work, repair work, etc. can be enhanced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a construction machine such as a hydraulic excavator, for example, and more particularly to a construction machine in which doors that can be opened and closed on the side of a building cover are arranged side by side in the front and rear directions.

  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. It is roughly constituted by a working device.

  Here, the upper revolving structure includes a revolving frame forming a support structure, an engine mounted on the rear side of the revolving frame, a cab mounted on the left front side of the revolving frame and on which an operator rides, and the rear of the cab. A building cover provided on the revolving frame so as to cover the engine from the side is roughly configured (see, for example, Patent Document 1).

JP 2001-262618 A

  In addition, excavator work includes, for example, excavation of deep holes. When performing this deep hole excavation work, the standard specification cab can be looked into the hole bottom away from the excavation position. Can not. Therefore, some hydraulic excavators include a sliding cab that can move forward and backward with respect to a revolving frame (see, for example, Patent Document 2). In this hydraulic excavator, the operator can work while looking into the hole bottom by moving the cab to the front side and approaching the excavation position (hole).

JP 2001-180381 A

  The building cover of the hydraulic excavator forms an engine chamber that houses the engine therein, and a rear utility chamber that is located on the front left side of the engine chamber and houses, for example, an air cleaner and a grease gun. Some hydraulic excavators having a sliding cab include a front utility cover that can move forward and rearward together with the cab between the cab and the rear utility chamber. The inside of the front utility cover serves as a front utility chamber for accommodating, for example, a hydraulic hose, a cable guide device for guiding cables such as electrical wiring, and a vehicle-mounted tool when the cab moves.

  The building cover also includes a rear door that covers the engine room from the left and right sides, and an intermediate door that covers the rear utility room from the left side. It is configured to open and close using the part as a fulcrum. The front utility cover includes a front door arranged on the front side of the intermediate door so as to cover the front utility chamber from the left side, and the front door is configured to open and close using the front portion as a fulcrum in the same manner as the intermediate door. ing. Then, by opening each door appropriately, maintenance work for the engine, air cleaner, etc., work for putting in and out the grease gun, tools, etc. can be performed.

  On the other hand, the hydraulic excavator of Patent Document 2 is provided with a handrail extending upward and downward on the rear side of the sliding cab. Thereby, the operator and the worker can easily get on and off the upper swing body by grasping the handrail.

  By the way, in the hydraulic excavator of Patent Document 2 described above, it is possible to easily and safely get on and off by grasping the handrail described above when getting on and off the upper swing body.

  However, when handrails are provided at similar positions with respect to the cab having the front utility chamber described above, handrails cannot actually be provided because the handrails obstruct when opening the intermediate door and the front door. There is a problem. Even if a handrail is provided, the opening degree of the door is limited by this handrail, so that there is a problem that inspection, maintenance workability, taking in and out of articles becomes difficult.

  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 provide an upward and downward direction at a position that does not obstruct the opening and closing of the door even when a door that can be opened and closed is provided in the front utility chamber. It is another object of the present invention to provide a construction machine that can be provided with a handrail extending in the direction.

  A construction machine according to the present invention is mounted on a frame that forms a support structure, a sliding cab that is provided on the left front side of the frame and is movable forward and backward with respect to the frame, and on the rear side of the frame. The cab between the cab and the rear utility chamber, and a building cover that forms a prime mover chamber that is attached to the frame and accommodates the prime mover inside, and a rear utility chamber located on the front side of the prime mover chamber. And a front utility cover that is movable forward and rearward and has a front utility chamber formed therein. The building cover covers the rear utility chamber from the left side and opens and closes with the front portion as a fulcrum. The front utility cover is arranged side by side on the front side of the intermediate door so as to cover the front utility chamber from the left side. The part or the rear and a front door for opening and closing as a fulcrum.

  In order to solve the above-mentioned problem, the feature of the configuration adopted by the invention of claim 1 is that the front utility cover is provided with a handrail extending upward and downward at the left rear corner position of the front utility cover. There is a configuration in which the front door is disposed at a position outside the range of the locus when the front door is opened and closed and the locus when the intermediate door is opened and closed.

  According to a second aspect of the present invention, in the upper left position of the front utility cover, another handrail extending in the front and rear directions from the upper portion of the handrail toward the cab is provided.

  According to a third aspect of the present invention, the cab is provided with an upper handrail that is located on the left side of the ceiling and extends in the front and rear directions.

  According to the first aspect of the present invention, the range of the locus when the front door opens and closes and the range of the locus when the intermediate door opens and closes between the front door and the intermediate door at the left rear corner position of the front utility cover. A handrail extending upward and downward is provided at a position deviated from the position. Therefore, even when a front door and an intermediate door that can be opened and closed are provided, a handrail can be provided at a position that does not obstruct the opening and closing of each door, and both a door that opens and closes the utility room and a handrail that is gripped when getting on and off are provided. be able to.

  As a result, various devices, tools, maintenance tools and the like can be accommodated in the utility room by the openable door, and can be easily taken out. Furthermore, operators and workers can get on and off easily and safely by grasping the handrail.

  According to the second aspect of the present invention, since the front utility cover is provided with another handrail extending in the forward and rearward directions from the top of the handrail toward the cab, the cab is slid forward. Even when getting on and off the cab, it is possible to easily and safely get on and off by grasping another handrail.

  According to the invention of claim 3, since the upper handrail extending in the front and rear directions is provided on the left side of the ceiling portion of the cab, when moving the side of the cab, it is easy to grasp the upper handrail. And can be moved safely.

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

  1 to 8 show a first embodiment of the present invention. 1 and 2, reference numeral 1 denotes a hydraulic excavator as a construction machine. The hydraulic excavator 1 includes a self-propelled crawler-type lower traveling body 2 and an upper portion mounted on the lower traveling body 2 so as to be able to turn. The revolving unit 3 and a work device 4 that is provided on the front side of the upper revolving unit 3 so as to be able to move up and down and perform excavation work of earth and sand and the like are roughly constituted.

  Reference numeral 5 denotes a revolving frame that forms a support structure of the upper revolving structure 3. As shown in FIG. 3, the revolving frame 5 is formed in a thick flat plate shape, and the front and rear bottom plates 6, and the front and the left and right sides of the bottom plate 6 standing on the bottom plate 6, Left and right vertical plates 7 extending in the rearward direction, and a left-hand side of a D-shaped cross section supported via a plurality of overhanging beams (not shown) extending in the front and rear directions with a gap on the left side of the left vertical plate 7 A side frame 8 and a right side frame (not shown) having a D-shaped cross section that extends in the front and rear directions with a gap on the right side of the right vertical plate 7 and is supported via a plurality of overhanging beams. Yes.

  Reference numeral 9 denotes a left and right extension frame (only the left side is shown) which is located on the left front side of the revolving frame 5 and extends forward from the left side frame 8 and the like. It is added to the swivel frame of the standard specification so that it can be movably mounted. A slide mechanism 10 described later is provided on the left front side of the revolving frame 5 including the extension frames 9.

  Reference numeral 10 denotes a slide mechanism provided on the left front side of the revolving frame 5. The slide mechanism 10 slides the cab 11 forward and backward relative to the revolving frame 5. Further, as shown in FIG. 5, the slide mechanism 10 includes a slide frame 10A provided so as to be movable forward and backward relative to the left side frame 8, the left and right extension frames 9, and the like. Connected to the slide cylinder 10B provided between the frame 10A and moving the slide frame 10A forward and backward, and to the revolving frame 5 side and the cab 11 side which are located on the rear side of the slide frame 10A and move relative to each other. The cable guide device 10C is generally configured.

  Here, in the cab 11, various lever devices, switches, and the like are provided, and these use a plurality of cables such as a hydraulic hose and an electric wiring, etc. (Not shown). Therefore, the cable guide device 10C is provided at the lower rear portion of the cab 11, and the cables are entangled or worn when the cab 11 is moved in the front and rear directions by passing the cables through the cable guide device 10C. Is preventing. The cable guide device 10C is configured to always form a gentle arc by, for example, connecting a large number of rectangular cylinders so as to be rotatable.

  Then, by extending the slide cylinder 10B, the slide mechanism 10 moves the cab 11 and the front utility cover 24 (to be described later) together with the slide frame 10A to the front side and arranges them at the front position as shown in FIG. On the other hand, when the slide cylinder 10B is reduced, the cab 11 and the front utility cover 24 are retracted to a position where the front utility cover 24 is close to the building cover 16 as shown in FIG.

  Reference numeral 11 denotes a cab mounted on the left front side of the revolving frame 5, that is, on the slide frame 10 </ b> A of the slide mechanism 10. The cab 11 is entered by an operator to operate the hydraulic excavator 1, and a driver's seat, various lever devices, switches, and the like (all not shown) are disposed therein. The cab 11 is configured as a box structure by a front surface portion 11A, a rear surface portion 11B, a left side surface portion 11C, a right side surface portion 11D, and a ceiling portion 11E, as shown in FIGS. A cab door 11F for entering and exiting the cab 11 is provided on the left side surface portion 11C so as to be openable and closable. Further, on the left side of the cab 11, a cab handrail 32 to be described later is provided that extends upward and downward at the front position and extends forward and rearward at the upper position.

  A side step 12 is located on the lower left side of the cab 11 and extends laterally. The side step 12 is attached to the slide frame 10 </ b> A of the slide mechanism 10. As a result, the side step 12 can move forward and backward together with the cab 11 and the front utility cover 24. The side step 12 is for an operator or the like to get on and off the cab 11. In particular, in a state where the cab 11 is moved to the front side together with the slide frame 10 </ b> A, it becomes a communication passage that enables the passage between the ground and the cab 11.

  Reference numeral 13 denotes an engine (illustrated by a dotted line in FIG. 3) as a prime mover mounted on the rear side of the turning frame 5, and the engine 13 is disposed in a horizontally placed state extending in the left and right directions, for example. A hydraulic pump 14 for supplying pressure oil as a power source to various hydraulic actuators is attached to the right end side of the engine 13, and heat exchange including a radiator, an oil cooler, a cooling fan, and the like is provided on the left side of the engine 13. A device 15 is provided.

  Reference numeral 16 denotes a building cover provided on the revolving frame 5. As shown by a dotted line in FIG. 3, the building cover 16 includes an engine chamber 17 as a prime mover chamber that houses the engine 13, the hydraulic pump 14, and the heat exchange device 15, and a rear portion that is located on the left front side of the engine chamber 17. The utility room 18 is formed. The rear utility chamber 18 accommodates, for example, an air cleaner, a grease gun for grease supply, and the like (none of which are shown).

  The building cover 16 is provided on the left upper side of the engine upper cover 19, an engine upper cover 19 that covers the upper side of the engine chamber 17, a rear door 20 that covers the engine chamber 17 from the left and right sides, and a rear utility chamber. The upper plate 21 that covers the rear utility chamber 18 from the upper side, the partition plate 22 that covers the rear utility chamber 18 from the front side, and the intermediate door 23 that is arranged so as to be arranged in front of the rear door 20 and covers the rear utility chamber 18 from the left side. It is configured.

  Here, the engine upper cover 19 is provided on the rear side of the building cover 16 and is provided over the entire width of the revolving frame 5 so as to cover the engine 13, the hydraulic pump 14, and the heat exchange device 15 from above. The engine upper cover 19 is provided with an engine hood 19A that can be opened and closed. Further, the rear door 20 is provided on both the left and right sides of the engine upper cover 19 and opens and closes with the rear portion as a fulcrum so as to be opened with a middle door 23 described later as shown in FIG. On the other hand, the upper surface plate 21 is located on the left front side of the engine upper cover 19 and covers the rear utility chamber 18 from above, and is formed so as to be substantially flush with the engine upper cover 19. Further, the partition plate 22 is erected on the front portion of the upper surface plate 21 and the intermediate door 23 so as to extend leftward and rightward (illustrated in FIGS. 6 and 7). The building cover 16 is provided with another partition plate (not shown) formed in substantially the same manner as the partition plate 22, and the partition plate separates the engine chamber 17 from the rear utility chamber 18. Yes.

  Reference numeral 23 denotes an openable intermediate door provided on the left side of the top plate 21. The intermediate door 23 covers the rear utility chamber 18 from the left side. Further, as shown in FIG. 7, the intermediate door 23 is composed of an outer surface plate 23A, and two reinforcing members 23B that are spaced apart from each other in the width direction inside the outer surface plate 23A and extend upward and downward. Has been. The intermediate door 23 has a front reinforcing member 23B attached to a partition plate 22 described later via two hinges 23C. Accordingly, the intermediate door 23 is configured to open and close with the front portion as a fulcrum, contrary to the rear door 20 described above, as indicated by a two-dot chain line in FIG.

  Reference numeral 24 denotes a front utility cover which is provided on the rear side of the cab 11 and forms a front utility chamber 25 therein. The front utility cover 24 is mounted on the slide frame 10A of the slide mechanism 10 and can move forward and backward together with the cab 11, as shown in FIG. Further, the front utility cover 24 is disposed between the cab 11 and the rear utility chamber 18. Further, the front utility cover 24 can accommodate the cable guide device 10C of the slide mechanism 10 in a state in which the cab 11 is retracted, and can accommodate an in-vehicle tool or the like in the remaining space.

  The front utility cover 24 includes an upper plate 26 that covers the upper side of the front utility chamber 25, an openable front door 27 that covers the left side of the front utility chamber 25, and a partition plate (not shown) that closes the front and rear. And is roughly composed. Here, as shown in FIG. 6, the front door 27 constituting the front utility cover 24 is configured to open and close with the front portion as a fulcrum, similar to the intermediate door 23 described above.

  Reference numeral 28 denotes a locus when the intermediate door 23 is opened / closed around the rotation center point A of the hinge 23 </ b> C, and 29 denotes a position when the front door 27 is opened / closed around the hinge (not shown) like the intermediate door 23. The trajectory is shown (both are shown by two-dot chain lines in FIGS. 6 and 8). Both loci 28 and 29 are formed in a fan shape.

  Reference numeral 30 denotes a handrail for getting on and off which is provided at the position of the left rear corner of the front utility cover 24. The handrail 30 for getting on and off is gripped when getting on and off the side step 12, and is provided to extend upward and downward. Further, as shown in FIGS. 4 and 6, the boarding handrail 30 is formed, for example, by bending one pipe member into a U-shape. That is, the handrail 30 for getting on and off is grasped when getting on and off the vertical pipe part 30A in the upper and lower direction, the upper mounting part 30B bent from the upper part of the vertical pipe part 30A and extending in the lateral direction, and the vertical pipe part The lower mounting portion 30C is bent from the lower portion of 30A and extends in the lateral direction.

  In the handrail 30 for getting on and off, the upper attachment portion 30B is bolted to the left rear corner position of the upper surface plate 26 of the front utility cover 24, and the lower attachment portion 30C is located at the left rear portion position of the slide frame 10A of the slide mechanism 10. It is bolted. Here, the vertical pipe portion 30 </ b> A of the handrail 30 for getting on and off is disposed at a position set based on each mathematical formula described later, and this position is the middle door 23 of the building cover 16 and the front door 27 of the front utility cover 24. This position is a position that does not hinder the opening / closing operation (position that does not interfere).

  Next, the positional relationship between the intermediate door 23 of the building cover 16, the front door 27 of the front utility cover 24, and the handrail 30 for getting on and off will be described with reference to FIG.

  First, when the vertical pipe portion 30A of the handrail 30 for getting on and off is arranged at a position where it does not interfere with the intermediate door 23 and the front door 27, the vertical pipe portion 30A is separated from the closed intermediate door 23 by a dimension g on the left side. However, it is necessary to dispose the front door by a dimension f from the middle door 23 that is opened most widely, and to dispose a distance h from the locus 29 of the front door 27 by a distance h.

At this time, the rotation center point of the hinge 23C of the intermediate door 23 is A, the center point of the vertical pipe portion 30A of the boarding handrail 30 is B, and the outer surface plate 23A of the intermediate door 23 closed through the point A Let C be the intersection of an orthogonal straight line and a straight line extending in parallel with the outer surface plate 23A of the intermediate door 23 closed through the point B. An intersection of a straight line extending in parallel with the outer surface plate 23A of the intermediate door 23 opened through the point A and a straight line orthogonal to the outer surface plate 23A of the intermediate door 23 opened through the point B is defined as D. Furthermore, let E be the intersection of line AC and line BD. Then, the separation dimensions f, g, and h can be obtained from the relationship between the right triangle ABC and the right triangle ABD. In this case, a, b, r, θ1, and θ2 in FIG. 8 can be defined as follows.
a: Distance dimension from the pivot center point A of the hinge 23C to the outer surface of the outer surface plate 23A b: Linear distance dimension between the pivot center point A of the hinge 23C and the center point B of the vertical pipe portion 30A r: Handrail 30 for getting on and off Radial dimension θ1 of the vertical pipe portion 30A: maximum opening of the intermediate door 23

  Here, the intermediate door 23 can be opened to a position where the reinforcing member 23B is in contact with the hinge 23C as shown by a locus 28 indicated by a two-dot chain line in FIG. 8, and this state is the maximum opening θ1. The separation dimension f between the outer surface plate 23A of the intermediate door 23 and the vertical pipe portion 30A of the handrail 30 for getting on and off that has the maximum opening θ1 can be obtained by the following equation (1).

  In this case, the distance dimension c between the points BE required for obtaining the separation dimension f can be obtained by the following equation (2).

但し、ｘ：点ＢＣ間の距離寸法
θ2：９０−θ1

However, x: Distance dimension between points BC θ2: 90−θ1

  Further, the distance dimension e between the points DE required for obtaining the separation dimension f can be obtained by the following equation (3).

  At this time, the distance d between the points AD used in the above equation 3 can be obtained by the following equations 4 and 5.

但し、ｂ：点ＡＢ間の距離寸法

Where b: distance dimension between points AB

但し、ｙ：点ＡＣ間の距離寸法

Where y: distance between points AC

  Further, the distance g between the outer surface of the outer surface plate 23A of the closed intermediate door 23 and the vertical pipe portion 30A of the handrail 30 for getting on and off can be obtained by the following equation (6).

  And by making the separation dimension f and the separation dimension g larger than 0 (f> 0, g> 0), the vertical pipe portion 30A of the handrail 30 for getting on and off does not interfere with the intermediate door 23 of the building cover 16 to be opened and closed. Can be placed in position.

  Further, since the front door 27 opens and closes with a locus 29 indicated by a two-dot chain line in FIG. 8, a position outside the range of the locus 29, that is, a separation dimension h from the locus 29 becomes larger than zero. (H> 0) The vertical pipe portion 30A of the handrail 30 for getting on and off is disposed.

  As described above, when the intermediate door 23 is opened, a distance of the dimension f is provided between the locus 28 and the closed intermediate door 23 is provided with a distance of the dimension g, and when the front door 27 is opened. By arranging the vertical pipe portion 30A of the handrail 30 for getting on and off so as to provide a space of the dimension h between the trajectory 29, the vertical pipe portion 30A hinders the opening / closing operation of the intermediate door 23 and the front door 27. Can be placed in no position. In this case, it is desirable to set the separation dimensions f, g, and h so that the fingers that have grasped the vertical pipe portion 30A do not come into contact with each other.

  Reference numeral 31 denotes a horizontal handrail as another handrail provided at the upper left position of the front utility cover 24. The horizontal handrail 31 is formed, for example, by bending a single pipe member into a U-shape, and is provided so as to extend forward and rearward from the upper portion of the handrail 30 for getting on and off toward the cab 11. The lateral handrail 31 is gripped when walking on the side step 12 and is bolted to the left position of the upper surface plate 26 of the front utility cover 24.

  Further, 32 is a cab handrail provided on the left side of the cab 11, and the cab handrail 32 is formed, for example, by bending one pipe member into an L shape. That is, the cab handrail 32 is curved along the corners of the front surface portion 11A and the left side surface portion 11C and extends upward and downward, and the front handrail 32A is positioned on the left side of the ceiling portion 11E. The upper handrail 32B extends rearward from the upper part of 32A.

  The front handrail 32 </ b> A of the cab handrail 32 is gripped when the cab door 11 </ b> F is opened and the cab 11 is moved in and out, for example. Further, the upper handrail 32B is gripped when walking along the cab 11 on the side step 12.

  Reference numeral 33 denotes a counterweight provided on the rear end side of the revolving frame 5, and the counterweight 33 balances the weight with the work device 4. As shown in FIG. 3, reference numeral 34 denotes a hydraulic oil tank provided on the right side of the front portion of the revolving frame 5, and reference numeral 35 denotes a fuel tank provided on the front side of the hydraulic oil tank 34.

  The hydraulic excavator 1 according to the first embodiment has the above-described configuration. Next, an operation when the operator gets on and off the cab 11 of the hydraulic excavator 1 will be described.

  First, when boarding the cab 11, it rides on the lower traveling body 2, grabs the handrail 30 for getting on and off, and goes up on the side step 12. Then, the operator who goes up to the side step 12 grabs the side handrail 31 and walks on the side step 12 toward the cab 11, and changes the side step to the upper handrail 32B of the cab handrail 32 at the side of the cab 11. You can safely go up to 12 fronts. At the front portion of the side step 12, the user can get into the cab 11 by grasping the front handrail 32 </ b> A of the cab handrail 32.

  Thus, the operator can easily and safely board the cab 11 by grasping the handrail 30 for getting on and off, the handrail 31 on the side, the upper handrail 32B of the handrail 32 for the cab, and the front handrail 32A of the handrail 32 for the cab. be able to. On the other hand, contrary to the above-described operation, the operator can easily and safely grasp the front handrail 32A of the cab handrail 32, the upper handrail 32B of the cab handrail 32, the side handrail 31, and the entry handrail 30 in this order. You can get off the cab 11.

  Next, the operation of the hydraulic excavator 1 according to the first embodiment will be described. The operator gets on the cab 11 in the order described above, and operates various lever devices, switches, and the like while sitting on the driver's seat. Thereby, the lower traveling body 2 can be run, or the work device 4 or the like can be moved up and down to perform excavation work of earth and sand.

  The excavation work includes an operation of excavating a deep hole. In this deep hole excavation work, the cab 11 is moved to the front side by the slide mechanism 10 provided in the revolving frame 5, and the cab 11 is brought close to the deep hole to be excavated. Thereby, the operator can excavate a deep hole efficiently, seeing a hole bottom.

  Next, the case where the excavator 1 is inspected, repaired, etc. will be described. For example, the rear door 20 and the intermediate door 23 can be largely opened by pulling the front portion of the rear door 20 and the rear portion of the intermediate door 23 toward the front. As a result, it is possible to perform inspection work for the heat exchange device 15 and the like housed in the engine chamber 17, and to perform inspection work for the air cleaner housed in the rear utility chamber 18 and greasing work by removing the grease gun. It can be carried out.

  Furthermore, when repair work such as the heat exchange device 15 or the air cleaner is performed, the front door 27 can be opened largely by pulling the rear portion of the front door 27 of the front utility cover 24 toward the front. Thereby, the stored vehicle-mounted tool can be taken out and the heat exchange device 15, the air cleaner, etc. can be repaired.

  Here, in the vicinity of the left side of the building cover 16, the vertical pipe portion 30 </ b> A of the handrail 30 for getting on and off is disposed between the intermediate door 23 and the front door 27. As described above, since the vertical pipe portion 30A is arranged at a position deviating from the locus 28 when the intermediate door 23 is opened and closed and the locus 29 when the front door 27 is opened and closed, the intermediate door 23 and the front door 27 are It can be opened widely without being obstructed by the pipe portion 30A.

  As described above, according to the first embodiment, the boarding handrail 30 provided at the left rear corner position of the front utility cover 24 has the vertical pipe portion 30A extending upward and downward, and the intermediate door 23 has the intermediate door 23. It is configured to be disposed at a position outside the range of the locus 28 when the door is opened and closed and the locus 29 when the front door 27 is opened and closed. Therefore, on the left side of the front utility cover 24, a handrail 30 for getting on and off that can be gripped when getting on and off the side step 12 can be provided. In addition, the intermediate door 23 and the front door 27 can be greatly opened without being obstructed by the handrail 30 for getting on and off.

  As a result, the hydraulic excavator 1 can be provided with both the rear utility chamber 18 and the front utility chamber 25 that can accommodate an air cleaner, a grease gun, an in-vehicle tool, and the handrail 30 for getting on and off that is gripped when getting on and off. Thereby, for example, inspection work of the heat exchange device 15 and the like, repair work, greasing work using a grease gun, and the like can be easily performed, and workability can be improved. At this time, since the intermediate door 23 and the front door 27 can be opened largely, workability can be improved. In addition, an operator or a worker can get on and off easily and safely by grasping the handrail 30 for getting on and off. Moreover, since the handrail 30 for getting on and off can be arranged close to the building cover 16, it does not get in the way during traveling and work.

  Further, the upper utility plate 24 has a horizontal handrail 31 extending forward and rearward from the upper portion of the handrail 30 for getting on and off toward the cab 11, so that the cab 11 is slid forward by the slide mechanism 10. Even when getting on and off the cab 11 in a state where the vehicle has been pulled, it is possible to get on and off easily and safely by grasping the handrail 31.

  Further, a cab handrail 32 is provided on the left side of the cab 11, and the cab handrail 32 is provided with an upper handrail 32B which is located on the left side of the ceiling portion 11E of the cab 11 and extends in the front and rear directions. Therefore, even when the side of the cab 11 is moved, even if the handrail 31 is not reachable, it can be easily and safely moved by grasping the upper handrail 32B.

  Next, FIG. 9 and FIG. 10 show a second embodiment of the present invention. The feature of this embodiment is that the front door is configured to open and close with the rear portion as a fulcrum. 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. 9, reference numeral 41 denotes a front door according to the second embodiment used in place of the front door 27 according to the first embodiment. As shown in FIG. 10, the front door 41 includes an outer surface plate 41A and two reinforcing members 41B that are spaced apart in the front and rear directions on the inner side of the outer surface plate 41A. The two reinforcing members 41C provided on the rear reinforcing member 41B are configured.

  Further, the front door 41 is configured to open and close with the rear portion as a fulcrum, contrary to the intermediate door 23, by attaching a hinge 41C provided on the rear reinforcing member 41B to the partition plate 42. As a result, the front door 41 opens and closes with a locus 43 as shown by a two-dot chain line in FIGS. 9 and 10.

  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, since the handrail 30 for getting on and off can be arranged at a position outside the range of the locus 28 of the intermediate door 23 and the locus 43 of the front door 41, the intermediate door 23 and the front door The boarding handrail 30 can be provided at a position that does not interfere with the opening and closing of the 41.

  In the first embodiment, a horizontal handrail 31 extending in the front and rear directions is provided on the upper plate 26 of the front utility cover 24, and a cab handrail 32 extending in the front and rear directions on the left side of the ceiling portion 11E of the cab 11. The case where the upper handrail 32B is provided is described as an example. The present invention is not limited to this. For example, when the handrail 30 for getting on and off and the upper handrail 32B of the handrail 32 for the cab are within the reach of the hand, the lateral handrail 31 may be omitted. Moreover, when the handrail is provided in the side step 12, it is good also as a structure which abbreviate | omits both the handrail 32 for a cab and the side handrail 31. FIG. This configuration can be similarly applied to the second embodiment.

  Moreover, in each embodiment, the hydraulic excavator 1 provided with the crawler type lower traveling body 2 was 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 hydraulic excavator provided with a wheel-type lower traveling body.

1 is a front view showing a hydraulic excavator according to a first embodiment of the present invention. FIG. 2 is a front view showing the hydraulic excavator of FIG. 1 in a state where a cab is slid forward. FIG. 2 is an enlarged plan view showing an enlarged hydraulic excavator from which a working device is omitted. It is a principal part expansion perspective view which expands and shows the left side of an upper revolving body. It is a principal part expansion perspective view which shows the left front side of a turning frame, and a slide mechanism. It is a principal part enlarged plan view which expands and shows the circumference | surroundings of an intermediate door, a front door, and the boarding railing. It is the principal part expansion perspective view which looked at the attachment state of the intermediate door from the back utility room. It is sectional drawing which looked at the arrangement | positioning relationship of an intermediate | middle door, a front side door, and the handrail for boarding / alighting from the arrow VIII-VIII direction in FIG. It is a principal part enlarged plan view which expands and shows the front door by the 2nd Embodiment of this invention with an intermediate door, the handrail for boarding, etc. It is the principal part expansion perspective view which looked at the attachment state of the front door from the front utility room.

Explanation of symbols

1 Excavator (construction machine)
5 Swivel frame 10 Slide mechanism 11 Cab 12 Side step 13 Engine (motor)
16 Building cover 17 Engine room (Motor room)
18 Rear utility room 20 Rear door 21, 26 Top plate 23 Intermediate door 24 Front utility cover 27, 41 Front door 28 Trajectory when the intermediate door opens and closes 29, 43 Trajectory when the front door opens and closes 30 Handrail for getting on and off ( handrail)
30A Vertical pipe part 30B Upper attachment part 30C Lower attachment part 31 Lateral handrail (other handrails)
32 Handrail for cab 32A Front handrail 32B Upper handrail

Claims (3)

A frame that forms a support structure, a sliding cab that is provided on the left front side of the frame and that can move forward and backward with respect to the frame, a prime mover mounted on the rear side of the frame, A building cover that is installed and forms a prime mover room that houses the prime mover and a rear utility room located on the front side of the prime mover room, and the front and rear directions together with the cab between the cab and the rear utility room It consists of a front utility cover that is movably provided and has a front utility chamber formed inside,
The building cover is provided with an intermediate door that covers the rear utility chamber from the left side and opens and closes with a front portion as a fulcrum, and the front utility cover is arranged side by side on the front side of the intermediate door so as to cover the front utility chamber from the left side. In a construction machine comprising a front door that opens and closes with the front or rear as a fulcrum,
A handrail extending upward and downward is provided at the left rear corner position of the front utility cover, and the handrail is out of the range of the locus when the front door opens and closes and the locus when the intermediate door opens and closes. Construction machine characterized in that it is configured to be placed at a different position.   The construction machine according to claim 1, wherein another handrail extending in the front and rear directions from the top of the handrail toward the cab is provided at an upper left position of the front utility cover.   The construction machine according to claim 1 or 2, wherein the cab is provided with an upper handrail that is positioned on the left side of the ceiling and extends in the front and rear directions.

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