JP2014201923A - Handrail for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid acting of an excessive load on a handrail, without hindering a visual field of an operator when operating a construction machine, by being usable as the handrail in work on an upper turning body, without forming the handrail provided in the rear of a cab as a separate shape, in the construction machine.SOLUTION: A construction machine 1 comprises a lower travel body 2, an upper turning body 3 turnably mounted on the lower travel body and having a cab 6 capable of boarding the operator and a front 4 having one end part connected to the upper turning body. The handrail for the construction machine comprises a pipe bending-shaped handrail body 30 provided in an upper part of the upper turning body and on the back face side of the cab, handrail fixing means 40 for fixing a leg part 30a of the handrail body and handrail holding means 20 installed on the back face side of the cab for holding the handrail body in the cab.

Description

  The present invention relates to a handrail for a construction machine, and more particularly to a handrail for a construction machine that is suitable for being disposed in an upper part of a machine room behind a cab.

  An example of a conventional handrail for a construction machine is described in Patent Document 1. In the construction machine described in this publication, the height of the handrail provided on the cover of the machine room can be changed, and the handrail can be transported without being separated from the construction machine. The upper handrail is folded during transportation, or the upper and lower handrails are nested and stored for transportation. In addition, the vertical handrail is nested, and a male screw formed at the tip of one handrail is tightened with a female screw via a taper nut, so that the height can be adjusted.

  Another example of a conventional handrail for a construction machine is described in Patent Document 2. The construction machine described in this publication can be used for maintenance / inspection / maintenance work, and is used as a handrail that does not interfere with surrounding structures during operation. It is described that a handrail is released.

JP-A-9-242122 JP 2011-58267 A

  In the construction machine, an operator climbs to the upper part of the machine room of the upper swing body of the construction machine before and after operation, and performs maintenance work, inspection work, and maintenance work. Therefore, in order to ensure safety such as prevention of falling, a safety fence or a handrail is provided on the periphery of the upper swing body including the rear of the cab.

  On the other hand, it is also important for construction machine operators to monitor the rear of the construction machine, and it is desirable that the rear view is not obstructed during operation. The harder the safety fences and handrails that are provided to ensure safety, the more likely it is that the field of view will be obstructed and driving will be hindered. Therefore, it has been proposed to provide a safety fence or a handrail during work on the upper revolving structure, and to remove them or store them in a predetermined place during operation of the construction machine.

  However, if the safety fence or the handrail is removed, it will be complicated to attach and remove the safety fence and the handrail during operation and maintenance work, and to store the removed safety fence and handrail. Therefore, in Patent Document 1, the handrail is folded in two stages so that the handrail can be transported without being separated from the vehicle. However, the shape of the handrail described in this publication is a structure in which the pipe is bent to form a heel shape and the foot portion of the heel shape is fixed to the construction machine, so the load applied to the upper side of the heel shape Acts as a large moment load at the base of the handrail. In order to withstand this moment load, it is necessary to reinforce the base portion of the handrail.

  Moreover, in the handrail described in the above-mentioned Patent Document 2, only a pin is inserted into the base portion of the column constituting the handrail to hold the handrail, and the load generated on the upper side of the handrail is the handrail. It does not take into account that it acts as a moment load at the root of the slab. In particular, in order to insert a pin at the root portion, it is necessary to form a hole in the handrail, and the rigidity of the handrail is reduced accordingly.

  The present invention has been made in view of the above-described problems of the prior art, and its purpose is to provide a handrail as a handrail during work on the upper-part turning body in a construction machine without making the handrail provided behind the cab a separate shape. It is possible to use it so that the visual field of the worker is not disturbed during operation of the construction machine, and even if a load is applied to the handrail during use as a handrail, it is excessive at the base of the handrail. It is to avoid the application of force or moment load. Another object of the present invention is to allow the handrail to be properly accommodated in the construction machine during operation of the construction machine that is not used as a handrail in addition to the above-described object.

  A feature of the present invention that achieves the above-described object is that a lower traveling body, an upper revolving body that is rotatably mounted on the lower traveling body and has a cab on which an operator can ride, and one end portion of the upper traveling body. In the handrail for a construction machine having a connected front, the handrail is a handrail main body in a pipe-bending shape provided on the back side of the cab above the upper revolving body, and the handrail main body. There is provided handrail fixing means for fixing a leg portion and handrail holding means attached to the back side of the cab in order to hold the handrail main body on the cab.

  In this feature, the handrail fixing means has a hinge structure for holding the handrail main body in a foldable manner, and holds the handrail main body on the upper surface of the upper revolving body when the handrail main body is folded. Locking means may be provided.

  According to the present invention, since the means for holding the handrail is provided on the back side of the cab of the construction machine and the handrail is folded, the handrail is always held by the cab and separated from the construction machine. There is no need. In addition, it can be used as a handrail during work on the upper revolving structure, and can be folded so as not to obstruct the operator's field of view during operation of the construction machine. Furthermore, even if a load is applied to the handrail during use as a handrail, the holding means on the cab back side bears the load, so that it is possible to avoid an excessive force or moment load from acting on the base portion of the handrail. Furthermore, during operation of a construction machine that is not used as a handrail, the handrail can be accommodated on the upper surface of the upper swing body of the construction machine.

1 is a perspective view of an embodiment of a construction machine according to the present invention. It is a perspective view of the cab back surface of the construction machine shown in FIG. It is a perspective view of the cab back surface of the construction machine shown in FIG. It is a perspective view of one Example of a handrail holding means. It is a perspective view of one Example of the basic part of a handrail. It is sectional drawing explaining the front view of one Example of the handrail locking pin, and its use condition. It is the perspective view of other Examples of the handrail latching pin, and sectional drawing explaining the use condition. It is a disassembled perspective view of the other Example of the base part of a handrail.

  Hereinafter, an embodiment of a construction machine according to the present invention will be described with reference to the drawings. In the following description, a small hydraulic excavator is taken as a construction machine, but the construction machine is not limited to a hydraulic excavator, and the present invention is applied to various hydraulically driven construction machines such as a wheel loader and various road machines. Applicable.

  FIG. 1 shows a side view of a hydraulic excavator 1 according to the present invention, and FIG. 2 shows a top view of the hydraulic excavator 1. The hydraulic excavator 1 is a self-propelled crawler-type lower traveling body 2, and is mounted on the lower traveling body 2 so as to be able to turn, and together with the lower traveling body 2, an upper revolving body 3 constituting a vehicle body of the hydraulic excavator 1 A front 4 is provided on the front side of the upper swing body 3 so as to be movable up and down. The excavator 1 is used for excavation work of earth and sand.

  The upper swing body 3 includes a swing frame 5 serving as a center of swing, a cab 6 mounted on the upper side of the swing frame 5 and on the front side, and a counter mounted on the rear side of the upper side of the swing frame 5. It has a weight 8 and an engine located between the cab 6 and the counterweight 8. A heat exchanger is disposed on the outside air intake side of the engine, and a hydraulic pump unit is disposed on the exhaust side. A portion where the engine or the like is disposed constitutes a machine room, and a part of the machine room is covered with a machine room cover 17. On the other hand, the side portion of the excavator 1 on the rear side of the cab 6 is covered with a building cover 11.

  As described above, for checking and repairing each part of the construction machine 1, an operator ascends to the upper surface of the upper swing body 3 and opens the machine room cover 17 and the cooler inspection window 15 (see FIG. 2). There is a case. In this case, a handrail as a protective fence is provided at the peripheral edge of the upper swing body 3 to prevent the fall from the construction machine 1. For example, a handrail main body 30 in which a steel pipe is folded into a square shape is provided substantially above the building cover 11 behind the cab 6. Hereinafter, details of the handrail including the handrail body 30, the handrail holding means 20, and the handrail fixing means will be described with reference to FIG.

  FIG. 2 is a perspective view of the upper surface side of the upper swing body 3 on the back surface of the cab 6. FIG. 2 is a diagram showing a state in which the handrail main body 30 is in use. One leg 30a of the handrail main body 30 is located on the left side edge of the upper swing body 3 with a slight gap on the back surface of the cab 6. In the present embodiment, the other leg portion 30 a of the handrail main body 30 is located at a position where the front-rear direction position is close to the front end of the machine room cover 17. In order to reinforce the handrail main body 30 and improve safety, the upper ends and intermediate portions of both leg portions 30a and 30a of the handrail main body 30 are connected by a horizontal fence portion 30b and a horizontal fence 30c.

  The base portions of both leg portions 30a, 30a of the handrail main body 30 are fixed and held by handrail fixing means 40 described in detail later. On the other hand, an intermediate portion of the leg portion 30 a on the front side of the handrail main body 30 and a portion above the horizontal fence 30 c is fixed to the handrail holding means 20 fixed to the back surface of the cab 6. Also, a fitting hole 31 is formed in the middle portion of the horizontal fence portion 30b that is a bent portion of the handrail body 30 and extends horizontally. A stop pin 32 that locks in the fitting hole 31 is attached to a ring 32a provided at an intermediate portion of the horizontal fence portion 30b via a chain 32b. Further, a locking hole 33 into which a locking pin is fitted is formed in the ceiling plate of the upper swing body 3.

  FIG. 3 is a perspective view similar to FIG. 2 showing a state where the handrail main body 30 is not used while the construction machine 1 is in operation. During the operation of the construction machine 1, the handrail body 30 releases the fixing of the handrail fixing means 40 provided at the base portion so that the rear view of the cab 6 is not obstructed, and is tilted from the base by approximately 90 degrees to turn the upper swing body. 3 is held on the upper surface. And the stop pin 32 is fitted in the through-hole 31 hole formed in the horizontal fence part 30b of the handrail main body 30, and the locking hole 33 formed in the ceiling board of the upper revolving structure 3. The stop pin 32 prevents the handrail main body 30 from vibrating or fluttering even when vibration is applied to the handrail main body 30 while the construction machine 1 is working.

  Details of the handrail main body 30 configured as described above and each means for holding the handrail main body 30 will be described with reference to FIGS. FIG. 4 is a perspective view of the handrail holding means 20 provided on the back side of the cab 6. The handrail holding means 20 closes a rectangular parallelepiped contact block 21 having a contact portion 24 with which a leg portion 30a which is a steel pipe abuts, and a contact portion 24 which is a cutout portion of the contact block 21. The presser plate 22 has a mounting plate 23 that holds the contact block 21 and has a mounting portion that is attached to the cab 6.

  In order to attach the handrail holding means 20 to the cab 6, a hole is formed in the attachment portion of the attachment plate 23. Bolts 26 are inserted into the holes, and the handrail holding means 20 is bolted to the cab 6. The contact block 21 and the mounting plate 23 are fixed by welding in this embodiment, but may be bolted or the like. Moreover, although the handrail holding means 20 is locked to the cab 6 with bolts, it may be fixed by welding. In any case, the attachment portion needs to have a strength capable of bearing a load applied to the handrail main body 30.

  The contact block 21 and the presser plate 22 are detachably fixed with bolts 25. When the handrail main body 30 is not used, the bolts 25 are loosened and the leg portions 30 a of the handrail main body 30 are removed from the contact portion 24, so that the presser plate 22 can be removed from the contact block 21. In order to prevent parts from being lost, it is preferable to prevent the bolt 25 from coming off. Further, since the handrail holding means 20 bears a load and a moment applied to the handrail main body 30, the attachment portion (bolt 25 portion) of the attachment plate 22 may be loaded with the maximum human weight. . The mounting portion (bolt 25 portion) of the mounting plate 22 is configured to withstand the load.

  Next, details of the handrail fixing means 40 provided at the base of the handrail body 30 are shown in FIG. FIG. 5 is a perspective view of the root portion of the handrail main body 30. Since the handrail main body 30 is formed by cutting and bending a steel pipe, the end of the leg portion 30a has a cylindrical shape. Therefore, the handrail fixing means 40 is configured by the steel pipe 41 into which the end of the leg 30a is fitted and the hinge 42 to which the pipe 41 is welded. The hinge 42 has a hinge shape, and is formed by attaching ring-shaped portions of two flat plate members 42a and 42b having one end in a ring shape to a shaft 42d. Although illustration is omitted, after fitting the leg portion 30a to the steel pipe 41, the steel pipe and the leg portion 30a are fixed by bolts and nuts or welding.

  A plurality of through holes are formed in the floor fixing side member 42b, which is one flat plate member, and is fixed to the ceiling of the upper swing body 3 with fixing bolts 42c. The handrail fixing means 42a, which is the other flat plate member, is welded and fixed to the side surface of the pipe 42 at the intermediate portion in the width direction. Therefore, when the hinge 42 is folded, the pipe 41 overlaps the floor fixing side member 42b together with the handrail fixing means 42a. At this time, the ends of the leg portions 30a of the handrail main body 30 inserted through the pipe 41 are also overlapped, and the handrail main body 30 changes its posture from the vertical position to the horizontal position.

  Next, FIG. 6 shows an embodiment of a stop pin 32 for stably holding the handrail body 30 on the construction machine 1 when not in use. FIG. 6A is a front view of the stop pin 32, and FIG. 6B is a cross-sectional view of the stop pin 32 locked to the handrail and the ceiling plate 3 a of the upper swing body 3. The stop pin 32 includes a large-diameter head portion 32c and a small-diameter shaft portion 32d.

  Since the fitting hole 31 which penetrates is formed in the intermediate part of the horizontal direction of the horizontal fence part 30b of the handrail main body 30 as mentioned above, the stop pin 32 is fitted in this fitting hole 31. A locking hole 33 is formed in the ceiling plate 3a of the upper swing body 3 at a position corresponding to a place where the fitting hole 31 is positioned when the handrail body 30 is laid down. Since the stop pin 32 can penetrate or fit into the ceiling plate 3a, the stop pin is held on the ceiling plate via the stop pin 32, and the handrail body 30 is prevented from vibrating or rattling during the work of the construction machine 1. it can. If the stop pin 32 can be removed alone, it is easy to lose it. Therefore, the stop pin 32 is connected to the handrail body 30 with a chain 32b or the like. For this reason, it is desirable to provide a locking hole or the like in the locking pin 32.

  When the cab 6 is attached to the revolving frame 5 via a vibration isolating member, the vibration system of the cab 6 (handrail holding means 20) and the vibration system of the handrail body 30 are different. Further, a cushioning material or the like is interposed between the contact block 21 of the handrail holding means 20 and the leg portion 30a of the handrail main body 30 so as to allow a certain degree of displacement without completely restraining the leg portion 30a. It may be fixed.

  Next, another example of the retaining pin will be described with reference to FIG. FIG. 7A is a perspective view of the stop pin 50, and FIG. 7B is a cross-sectional view for explaining a state in which the handrail body 30 is held when the handrail body 30 is not used. The retaining pin 50 is composed of a head portion 50a and a shaft portion 50b. The head 50a includes a lid 51 having a shape in which a part in the circumferential direction of the disk is slightly cut away in the thickness direction, a handle 52 that engages with the notch of the lid 51, and the handle 52 as a lid. It has the axis | shaft 53 attached to the part 51 so that rotation about 90 degrees is possible. That is, if the handle portion is rotated about 90 ° around the shaft 53 as shown in FIG. 7A, it can be used as a handle for lifting or rotating the entire retaining pin 50.

  On the other hand, if the handle portion 52 is rotated about 90 ° from the state of FIG. 7A and laid on the lid portion 51, the upper surface of the lid portion 51 is in a state without projections. Therefore, if the handle 52 is laid down and held in the locking hole 33 for the locking pin 50 formed in the upper swing body 3, for example, the handrail body 30 is stood in a predetermined procedure and provided on the back surface of the cab 6. Even after the handrail main body 30 is held by the handrail holding means 20, it does not hinder the operator's work. In this case, the operator walks around the upper surface of the upper swing body 3, but there is no projection on the upper surface of the retaining pin 50, so there is no fear of scooping.

  Two protrusions 54 and 55 are formed on the shaft portion 50b at two positions in the vertical direction at a 180 ° pitch. The upper protrusion 54 is for holding the stop pin 50 on the ceiling plate 3a of the upper swing body 3 while the handrail main body 30 is in use to prevent the loss of the stop pin 50. On the other hand, as shown in FIG. 7B, the lower projection 55 is for holding the handrail body 30 on the ceiling plate 3 a of the upper swing body 3 when the handrail body 30 is not used. Although not shown in the figure, a circular hole that matches the shape of the retaining pin 50 and elongated grooves at 180 ° pitches are formed in two circumferential directions of the hole, although not shown. .

  Therefore, when the projection 55 of the retaining pin 50 is fitted into the groove formed in the ceiling plate 3a of the upper swing body 3, and the retaining pin 50 is pushed in as it is and the projection 55 reaches below the ceiling plate 3a, the entire retaining pin 50 is handled. The portion 52 is rotated approximately 90 °. As a result, the lateral fence portion 31 b of the handrail body 30 is firmly held on the ceiling plate 3 a of the upper swing body 3 via the stop pin 50. In the case of the set pin of this embodiment, the handrail can be held on the upper swing body more reliably than in the case of the embodiment shown in FIG.

  Next, another embodiment for holding the handrail body 30 when not in use will be described with reference to FIG. In each of the above embodiments, the handrail body 30 is laid sideways and removed from the view of the cab 6 when not in use, but in this embodiment, the height of the handrail body 30 is changed when not in use. So as not to obstruct the view.

  That is, a plurality of holes 30d penetrating in the horizontal direction are formed in both leg portions 30a, 30a of the handrail main body 30 at different heights. On the other hand, a hole (not shown) through which the leg portion 30a of the handrail main body 30 can pass is formed in the ceiling plate 3a of the upper swing body 3, and the base portion 45 that holds the leg portion 30a is bolted to the upper surface of this hole. Secure with. The base portion 45 includes a base plate 45b having a through-hole formed in the central portion, and a guide tube 45a that is welded and fixed so as to stand upright on the base plate 45b. The guide tube 45a is formed with a through hole 45c penetrating in the horizontal direction. A plurality of fixing bolt holes 45d are formed in the base plate 45b. A screw 30 f is formed at the end of the leg portion 30 a of the handrail main body 30.

  In the handrail main body 30 of the present embodiment configured as described above, the leg portion 30a of the handrail main body 30 is inserted into the guide tube 45a of the base portion, and the upper side in the through hole 30d formed in the leg portion 30a when not in use. When the through hole 30d matches the through hole 45c of the guide tube 45a, the pin 47 is inserted in the horizontal direction to reduce the height of the handrail body 30. Similarly, in use, the lower through hole 30d of the leg 30a is aligned with the through hole 45c of the guide tube, and the pin 47 is inserted into these holes 30d and 45c. Accordingly, the handrail body 30 is fixed in a high state. Although illustration is omitted, also in this embodiment, when the handrail body 30 is used, the handrail body 30 is held by the handrail holding means 20 attached to the back surface of the cab 6. Further, in order to prevent the leg portion 30a of the handrail body 30 from coming out of the guide tube 45a, the leg portion 30a is formed at the end portion of the leg portion 30a when the leg portion 30a is penetrated to the ceiling board 3a portion of the upper swing body 3. A nut 46 is screwed into the threaded portion. Thereby, it can prevent that the leg part 30a slips out from the guide tube 45a. The nut 46 is preferably a double nut.

  In any of the above-described embodiments, the handrail is held by the handrail holding means provided behind the cab when the handrail is used, so that the force and moment applied to the handrail can be dispersed and the reliability of the handrail is improved. To do. Further, since the handrail is folded or the handrail is drawn into the upper revolving body when it is not used, there is no possibility of hindering the operator's view from the cab.

  Further, the shape of the pin is not limited to the above embodiment, and any shape that can hold the handrail on the upper swing body can be used. The handrail holding means 20 attached to the cab is not limited to that shown in the embodiment, and may be a means such as a wire.

DESCRIPTION OF SYMBOLS 1 ... Construction machine (hydraulic excavator), 2 ... Lower traveling body, 3 ... Upper turning body, 3a ... Ceiling board, 4 ... Front, 5 ... Turning frame, 6 ... Cab, 8 ... Counter weight, 11 ... Building cover, DESCRIPTION OF SYMBOLS 15 ... Cooler inspection window, 17 ... Machine room cover, 20 ... Handrail holding means, 21 ... Abutting block, 22 ... Holding plate, 23 ... Mounting plate, 24 ... Abutting part, 25 ... Set screw, 26 ... Mounting screw , 30 ... handrail body, 30a ... leg part, 30b ... side fence part, 30c ... side fence, 30d ... through hole, 30f ... screw part, 31 ... fitting hole, 32 ... set pin, 32a ... ring, 32b ... Chain 33: Hole for locking, 40 ... Handrail fixing means, 41 ... Pipe, 42 ... Hinge (hinge), 42a ... Foundation mounting side member, 42b ... Floor fixing side member, 42c ... Fixing bolt, 42d ... Shaft , ... basic part, 45a ... guide tube, 45b ... bay Splat, 45c ... Through hole, 45d ... Screw fixing hole, 46 ... Nut for retaining, 47 ... Lock pin, 50 ... Lock pin, 51 ... Cover part, 52 ... Handle part, 53 ... Shaft, 54, 55. Locking portion.

Claims (2)

For a construction machine having a lower traveling body, an upper revolving body that is mounted on the lower traveling body in a turnable manner and has a cab on which an operator can ride, and a front end that is connected to the upper revolving body. In the handrail,
The handrail is a pipe-bending handrail body provided on the back side of the cab at the upper part of the upper swing body, handrail fixing means for fixing a leg portion of the handrail body, and the handrail body A handrail for a construction machine, comprising handrail holding means attached to the back side of the cab for holding the cab on the cab.   The handrail fixing means has a hinge structure for holding the handrail main body in a foldable manner, and has a locking means for holding the handrail main body on the upper surface of the upper swing body when the handrail main body is folded. The handrail for a construction machine according to claim 1, wherein the handrail is provided.

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