JP2017206842A - Compact hydraulic shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact hydraulic shovel having a space secured for moving from an entrance to a driver seat when getting on/off, a wide operating range of a boom secured, and a living space secured around the driver seat within a range that would not hinder operation.SOLUTION: A rear small revolving-type mini shovel of the present invention includes: a revolving superstructure 2 having a rear edge part formed to be rotatable within a vehicle width; a work device 3 including a boom 3a; a driver seat 4; a pair of driving levers 7a, 7b; and an openable front guard 11 disposed between the boom 3a and the pair of driving levers 7a, 7b for blocking a flying foreign object on the driver seat 4. The front guard 11 includes a recess 11c for avoiding interference with the boom 3a of the work device 3 when the boom 3a is in a highest lifted state. A height position of the recess 11c has been set to be higher than a top edge of the pair of driving levers 7a, 7b.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a small hydraulic excavator such as a mini excavator provided with a front guard that prevents foreign objects from flying into a driver's seat.

  In a small hydraulic excavator, for example, a rear small turning type excavator, the turning body is made compact so that the rear end of the turning body can turn within the vehicle width. Along with this, the driver's seat is placed above the engine room where the engine, hydraulic equipment, etc. are placed, and two travel levers, a left travel lever and a right travel lever, are placed on the floor in front of the driver's seat. At both side positions of the seat, operation levers for turning, booming, arming, and bucket are arranged. In addition, a canopy is provided to cover the driver's seat. When excavation work or dismantling work is performed with such a small hydraulic excavator, foreign materials such as earth and sand that have been excavated toward the driver's seat may fly during the operation. There was a case where a front guard was installed to prevent the intrusion.

  Japanese Patent Application Laid-Open No. 2004-228561 describes a conventional technique including such a front guard. In this Patent Document 1, one side end is swingably connected to a support column arranged at the right front position when viewed from the driver's seat and is openable and closable, and a frame member and a lattice shape attached to the frame member A mini excavator provided with a front guard including a guard body is disclosed.

Japanese Patent Laying-Open No. 2015-96673

  By the way, the mini excavator disclosed in Patent Document 1 also has a revolving structure that is compact so that the rear end of the revolving structure revolves within the vehicle width as described above. A driver's seat covered with a canopy is arranged on the swivel body, a pair of travel levers for operating the travel body are arranged in front of the driver's seat, and the swivel body and the work device are operated on both sides of the driver's seat. An operation device for operating various actuators to be operated is arranged. Further, a floor seat that extends backward from a low position on the front side of the driver's seat and rises midway to form a seating portion of the driver's seat is provided on the revolving structure. An engine room in which the engine and the hydraulic pump are housed is provided below the driver seat difference portion on the revolving structure, and the rear end side of the revolving structure is arranged so as to cover the rear of the engine room in the left-right direction. A counter-curved counterweight extending in an arc shape is provided. Further, various devices such as a fuel tank, a hydraulic oil tank, and a control valve are arranged on the revolving structure, and the entrance to the driver's seat is narrow due to restrictions on securing the installation area of the driver's seat.

  Thus, in the situation where the installation area of the driver's seat is restricted, in the conventional technology disclosed in Patent Document 1, the entrance / exit is gradually narrowed from the floor seat toward the ceiling by the front guard. Therefore, there is a problem that it is difficult to get on and off the driver's seat from the entrance / exit. Moreover, in order to avoid interference with a front guard and a boom, there existed a problem that the operation range to the front guard side of a boom was restrict | limited.

  In order to solve the above-described problems, the object of the present invention is to secure a moving space when getting on and off from the entrance to the driver's seat, to ensure a wide operating range of the boom, and not to disturb the living space of the driver's seat. The object is to provide a small hydraulic excavator that can be secured within a range.

  In order to solve the above problems, the present invention provides a traveling body, a revolving body that is disposed on the traveling body and has a rear end portion that is turnable within a vehicle width of the traveling body, A swing post provided at a front position so as to be swingable in the left-right direction; a work device including a boom attached to the swing post and rotatable in the vertical direction; and a driver's seat disposed on the revolving structure; A canopy having a roof covering the driver's seat and a plurality of columns supporting the roof; a counterweight disposed at a rear portion of the revolving body; an engine room disposed below the driver's seat; and the revolving body A pair of travel levers installed at a front side position of the driver's seat to operate the traveling body, and disposed between the pair of travel levers and a base end portion of the boom of the work device, to the driver's seat Prevent foreign objects from flying In a small hydraulic excavator provided with a front guard that can be opened and closed, and a support member that is provided on the revolving structure and supports the front guard, the front guard is connected to the boom in the highest-up state of the boom of the working device. A recess portion for avoiding interference, and the height position of the recess portion is set to a position higher than the upper ends of the pair of travel levers, and the recess portion is at least an intermediate portion in the vertical direction of the front guard. And the upper side of the front guard above the intermediate part is at least from the lower part side to the intermediate part. The amount of entry is limited so that the amount of entry is smaller than the amount of entry to the driver's seat side to the side, and the intermediate portion is the pair of A row lever and an operating lever for operating the swiveling body and the operation device arranged adjacent to the left and right positions of the front portion of the driver seat, respectively, and the boom It is characterized in that it is set at a position where a space for allowing the rear bent portion of the boom to enter when the rear bent portion comes closest to the front guard.

  The small hydraulic excavator according to the present invention can secure a moving space when getting in and out of the driver's seat from the entrance / exit, can ensure a wide operating range of the boom, and can secure a living space of the driver's seat within a range that does not cause trouble. Thereby, this invention can improve work efficiency and workability compared with the past.

It is a perspective view which shows the mini excavator which comprises 1st Embodiment of the small hydraulic excavator which concerns on this invention. It is a side view of a 1st embodiment of a state except a work device. It is a top view of a 1st embodiment in the state where work equipment and a canopy were removed. It is a perspective view which shows the front guard part with which 1st Embodiment was equipped. It is a perspective view which shows the structure of the control part with which 1st Embodiment was equipped. It is a top view which shows the state which the mini excavator which concerns on 1st Embodiment is located in the slope whose inclination angle with respect to a horizontal surface is 25 degrees. It is a perspective view which shows the state except the working device of the small hydraulic excavator which concerns on 2nd Embodiment. It is a perspective view which shows the state which opened the front guard from the state shown in FIG. It is a side view which shows the small hydraulic excavator which concerns on 3rd Embodiment.

  Embodiments of a small hydraulic excavator according to the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1-3, the small hydraulic excavator which concerns on 1st Embodiment of this invention consists of the back small turning type | mold excavator, for example. The mini excavator includes a traveling body 1 having a pair of left and right crawler belts 1a and 1b, a swinging body 2 disposed on the traveling body 1, a swing post 6 provided at a front position of the swinging body 2, and And a work device 3 attached to the swing post 6.

  The work device 3 includes a boom 3a connected to the swing post 6 so as to be swingable in the left-right direction and pivotable in the vertical direction, and an arm 3b coupled to the tip of the boom 3a so as to be pivotable in the vertical direction. The bucket 3c is connected to the tip of the arm 3b so as to be rotatable in the vertical direction. A cushioning material 3a1 having, for example, a flat sliding surface with a low friction coefficient is attached to the convex portion forming the back bent portion of the boom 3a.

  As shown in FIG. 3, this mini excavator has a width dimension of the swing body 2 when the swing body 2 is positioned so that the working device 3 is positioned forward when the traveling body 1 moves forward. The shape of the swivel body 2 is set so as to substantially match the vehicle width that is the distance between the outer portion of 1a and the outer portion of the crawler belt 1b. In addition, the shape of the revolving structure 2 is set so that the rear end portion of the revolving structure 2 including the counterweight 9 formed in a convex curved shape is within the vehicle width of the traveling structure 1.

  A driver's seat 4 is disposed on the swivel body 2, and a pair of travel levers, that is, a left travel lever 7 a that operates a left travel motor that operates the crawler belt 1 a of the travel body 1, A right traveling lever 7b for operating a right traveling motor that operates 1b is disposed. On both sides of the driver's seat 4, operation levers 8 a and 8 b for operating the boom 3 a, the arm 3 b, the bucket 3 c, and the swing motor of the swing body 2 of the work device 3 are arranged. A gate lock lever 8c for connecting and disconnecting the flow of pressure oil supplied to each actuator of the mini excavator is disposed on the boarding / alighting side of the driver's seat 4.

  As shown in FIG. 2, an engine room 10 is provided below the driver's seat 4, and an engine 10a installed on the turning frame 2a and a hydraulic pressure driven by the engine 10a are provided in the engine room 10. A pump etc. are stored. A canopy 5 is arranged so as to cover the driver's seat 4. The canopy 5 includes a roof 5 a disposed above the driver's seat 4, a single column 5 b disposed in front of the driver's seat 4, and two columns 5 c and 5 d disposed behind the driver's seat 4. It consists of a three pillar canopy with

  Moreover, this 1st Embodiment is toward the driver's seat 4 during the operation | work by the working device 3 between the base end part of the boom 3a attached to the swing post 6, and the left travel lever 7a and the right travel lever 7b. A front guard 11 is provided to prevent foreign objects such as flying excavated earth and sand from entering the driver's seat 4.

  The front guard 11 is supported by a support member provided on the revolving structure 2, that is, a support portion 12 a extending in the lateral direction that is an upper portion of the front stay 12. The front stay 12 and the front guard 11 are disposed in front of the left traveling lever 7a and the right traveling lever 7b. The front guard 11 is connected to the support portion 12a of the front stay 12 by a pair of connecting tools, for example, a hinge portion 13 so as to be rotatable in the front-rear direction.

  As shown in FIGS. 1 and 2, the front guard 11 has a recessed portion 11 c that avoids interference with the rear bent portion of the boom 3 a when the boom 3 a of the working device 3 is in the highest position. The recess 11c is positioned higher than the upper ends of the pair of left travel lever 7a and right travel lever 7b, and is operated by the left travel lever 7a and right travel lever 7b, that is, held by the operator and swings in the front-rear direction. The position is set so as not to hinder the operation.

  The indentation 11c is at least in the middle of the front guard 11 in the vertical direction, and is formed so as to enter the driver's seat 4 from the lower side located at the front end of the revolving structure 2. The upper side above the intermediate part restricts the amount of entry so that the amount of entry is smaller than the amount of entry into the driver's seat 4 side from at least the lower side to the intermediate part.

  The intermediate portion described above is a pair of traveling levers 7a and 7b, and the upper positions of the operating levers 8a and 8b for operating the working device 3 and the swing body 2 disposed adjacent to the left and right positions of the front portion of the driver's seat 4, respectively. In this case, the boom 3a is set at a position where a space can be formed in which the above-described back-bent portion of the boom 3a can enter when the back-bending portion of the boom 3a is closest to the front guard 11 when the boom 3a is in the highest position.

  Moreover, the intermediate part mentioned above is arrange | positioned in the vicinity including the position according to preset eye level height. Moreover, the intermediate part mentioned above has entered into the driver's seat 4 side from the front support | pillar 5b of the canopy 5, and the front-end | tip of the roof 5a. As shown in FIG. 2, the intermediate portion is linearly limited to the driver's seat 4 side with the same amount of intrusion as that of the recessed portion 11c in relation to the recessed portion 11c. In addition, this intermediate part may incline ahead toward the front-end part side of the turning body 2 from the hollow part 11c.

  As shown in FIG. 4, the front guard 11 is arranged around the lattice-shaped portion 11 a and the lattice-shaped portion 11 a around the lattice-shaped portion 11 a so as to form the lattice-shaped portion 11 a. It consists of a holding member for holding, for example, a pipe material 11b.

  As shown in FIG. 4, the pipe member 11b is arranged at the upper side and extends in the horizontal direction, and the pipe member 11b is arranged at the lower side so as to face the horizontal portion 11b1 and extends in the horizontal direction. A horizontal portion 11b2, a bent portion 11b3 that forms a "<" in a side view in the middle portion to form a recessed portion 11c that is arranged and erected on one side, and a column 5b side. A bent portion 11b4 that is disposed upright on the other side so as to face the bent portion 11b3 and that forms a "<" in a side view in order to form the recess 11c. . As described above, the indented portion 11c is provided in a shape corresponding to the shapes of the bent portions 11b3 and 11b4 of the pipe material 11b, and the boom 3a of the work device 3 is rotated in the horizontal direction and in the vertical direction. Considering this, the width dimension in the horizontal direction is set to a dimension that matches the distance between the bent portions 11b3 and 11b4 of the pipe material 11b.

  Moreover, this 1st Embodiment is provided with the control part which controls the front guard 11 falling forward. As shown in FIG. 5, the restricting portion includes a first bracket 20 attached to the bent portion 11 b 4 of the pipe material 11 b of the front guard 11, and a first connector 21 fixed to the first bracket 20. It is out. In addition, the second bracket 22 attached to the horizontal portion of the column 5 b of the canopy 5, and the second connector 23 provided to be detachable from the first connector 21 and fixed to the second bracket 22 are included. Yes. Further, a flexible wire 24 having one end connected to the first bracket 20 and the other end connected to the second bracket 22 is provided.

  As shown in FIG. 1, when the front guard 11 is rotated forward and opened when the driver gets on and off the driver's seat 4, the front guard 11 is pulled by the extended wire 24 so that it does not fall forward. Kept.

  Moreover, when the front guard 11 side is rotated toward the driver's seat 4 and the first connector 21 is pushed into the second connector 23, the first connector 21 and the second connector 23 are engaged. The front guard 11 is kept closed as shown in FIG. At this time, the horizontal portion 11b1 forming the upper portion of the front guard 11 is in a position retracted to the driver's seat 4 side from the front end portion 5a1 of the roof 5a of the canopy 5.

  Further, when the lever 23a of the second connector 23 shown in FIG. 5 is operated from the state where the front guard 11 is closed in this way, the first connector 21 is detached from the second connector 23, and in this state, the front When the guard 11 is pushed by hand, the center of gravity of the front guard 11 moves from the rear to the front, the front guard 11 falls to the front in the direction approaching the work device 3, and when the hinge top 13 exceeds the top dead center, The guard 11 is held in the open state shown in FIG.

  As shown in FIG. 6, when the mini excavator is positioned on a slope having a maximum inclination angle of 25 ° with respect to a horizontal plane where the mini excavator can be climbed, when the front guard 11 is fully opened, The shape and dimensions of the front guard 11 are set so that the center of gravity 27 of the front guard 11 is positioned in front of a virtual vertical line 26 passing up and down the hinge portion 13 that forms the rotation center 25. Therefore, even when the airframe is inclined by 25 ° with respect to the horizontal plane, the center of gravity of the front guard 11 moves from the rear to the front by forming the rotation center 25 by pushing the front guard 11 forward as described above. If the rotation top dead center of the hinge portion 13 is exceeded, the front guard 11 can be held open.

  In the first embodiment configured as described above, when the operator gets into the driver's seat 4, the gate lock lever 8 c is lifted and the front guard 11 is opened as shown in FIG. Even though the space is limited, a boarding / exiting space is secured, and the operator can easily get into the driver's seat 4.

  Further, the operator seated in the driver's seat 4 lowers the gate lock lever 8c, rotates the front guard 11 in the direction of the driver's seat 4, and engages the first connector 21 with the second connector 23, The middle part of the wire 24 hangs downward and bends in a U-shape, and the front guard 11 is closed as shown in FIG. 2, so that an operator seated on the driver's seat 4 can work. In the first embodiment, even when the front guard 11 is closed, the amount of entry of the front guard 11 into the driver's seat 4 at the portion above the intermediate portion described above is linearly limited. Therefore, the space above the driver's seat 4 can be basically secured widely. Therefore, the operator can get into the driver's seat 4 even when the front guard 11 is closed.

  As described above, according to the mini excavator according to the first embodiment, it is possible to secure a moving space when getting in and out of the driver's seat 4 from the entrance / exit, and to secure a living space of the driver's seat 4 within a range that does not cause trouble. Moreover, since the grid | lattice-like part 11a of the front guard 11 has the hollow part 11c which avoids interference with the back bending part of the boom 3a in the maximum raising state of the boom 3a of the working device 3, the operating range of the boom 3a is widened. It can be secured. Thereby, 1st Embodiment can improve work efficiency and workability.

  For example, if the operation starts without closing the front guard 11 and the front guard 11 is pushed in the direction of the driver's seat 4 by the rear bent portion of the boom 3a as the boom is raised, the front portion around the hinge portion 13 is centered. The guard 11 rotates in the direction of the driver's seat 4 and damage to the lattice-like portion 11a of the front guard 11 due to the boom 3a is suppressed. In such a case, since the sliding surface of the cushioning material 3a1 provided on the convex portion that forms the back bent portion of the boom 3a contacts the lattice-like portion 11a of the front guard 11, the frictional resistance is suppressed to be small. The buffer material 3a1 also suppresses damage to the lattice-like portion 11a of the front guard 11.

  The second embodiment of the present invention shown in FIGS. 7 and 8 extends in the vertical direction according to the standing shape of one side 30a corresponding to the shape of the bent portion 11b4 of the front guard 11 and the column 5b of the canopy 5. And a connecting plate 30 that is fixed to the bent portion 11b4 of the front guard 11. Moreover, the side part 30b of the connection board 30 is connected so that rotation of the canopy 5 in the left-right direction is possible, and the hinge part 31 arranged in a pair in the up-down direction is provided. Further, as shown in FIG. 7, a stopper 32 is provided for locking the front guard 11 to the support portion 12 a of the front stay 12 when the front guard 11 is closed.

  The front guard 11 can be engaged with and disengaged from the stopper 32. When the front guard 11 is detached from the stopper 32, the front guard 11 can be opened in the left-right direction away from the driver's seat 4 as shown in FIG. . In this 2nd Embodiment, the control part containing the wire etc. which control the forward fall of the front guard 11 like 1st Embodiment is not provided. Other configurations are the same as those of the first embodiment described above. That is, the small hydraulic excavator according to the second embodiment is also composed of, for example, a rear small turning type excavator.

  In the second embodiment configured as described above, the operator can easily get on and off the driver's seat 4 by rotating the front guard 11 in the left-right direction and opening the same as in the first embodiment.

  In addition, since the front guard 11 has the indented portion 11c that avoids interference with the rear bent portion of the boom 3a when the boom 3a is in the upmost state, the same effects as those of the first embodiment can be obtained. In other words, the vehicle equipped with the front guard 11 can alleviate restrictions on the height position of the boom raising, the boom 3a can be raised to the highest height position that can be secured in terms of function, and work efficiency and Workability can be improved.

  Even in the third embodiment of the present invention shown in FIG. 9, the basic configuration of the front guard 40 is the same lattice-like portion as in the first and second embodiments, and the pipe material 40a holding this lattice-like portion. Indentations 40b that avoid interference with the boom 3a are formed in the lattice-like portion. However, in the third embodiment, when the front guard 40 is closed, the position of the horizontal portion 40a1 that forms the upper portion of the pipe member 40a is substantially coincident with the front end portion 5a1 of the roof 5a of the canopy 5. Thus, the shape of the pipe material 40a is formed. Other configurations are the same as those of the first embodiment, for example.

  In the third embodiment configured as described above, the same operation effect as that of the first embodiment can be obtained, and when the front guard 40 is closed, the upper space in front of the driver's seat 4 is made larger than that in the first embodiment. Can also be secured widely.

  In the first to third embodiments described above, the bent portions 11b3 and 11b4 of the pipe members 11b and 40a of the front guards 11 and 40 are provided in a shape that forms a shape of "K" in a side view. The present invention is not limited to setting the shapes of the front guards 11 and 40 in this way. For example, the bent portions 11b3 and 11b4 that form the side portions of the pipe members 11b and 40a of the front guards 11 and 40 are formed so that the upper portion and the lower portion extend in a vertical direction when viewed from the side, and the boom 3a is positioned at the top. You may form the intermediate part corresponding to the position which avoids interference with the back bending part of the boom 3a when it is set to the raising state, for example in circular arc shape. When configured in this way, the lattice-like portions held by the front guards 11 and 40 also extend in the vertical direction in the side view of the portions held by the upper and lower portions of the pipe members 11b and 40a. The part formed in the shape and held in the arc-shaped intermediate part of the pipe members 11b and 40a is formed so as to have an arc shape in a side view.

  Further, in the first and second embodiments, the hinge portion 13 is provided as a connecting member for connecting the front guard 11 to the support portion 12a of the front stay 12 so as to be rotatable in the front-rear direction. Further, the configuration is not limited to the configuration in which the front guard 11 is connected to the support portion 12 a of the front stay 12 by the hinge portion 13. For example, it may be configured that a bearing is provided instead of the hinge portion 13 as a connecting tool. The same applies to the third embodiment, and a bearing may be provided instead of the hinge portion 31.

DESCRIPTION OF SYMBOLS 1 Traveling body 1a Crawler belt 1b Crawler belt 2 Rotating body 2a Rotating frame 3 Working device 3a Boom 3a1 Cushioning material 4 Driver's seat 5 Canopy 5a Roof 5a1 Front end 5b Post 6 Swing post 7a Left traveling lever 7b Right traveling lever 8b Operation lever 8b 8c Gate lock lever 9 Counterweight 10 Engine chamber 10a Engine 11 Front guard 11a Lattice 11b Pipe material (holding member)
11b1 Horizontal portion 11b2 Horizontal portion 11b3 Bending portion 11b4 Bending portion 11c Recessed portion 12 Front stay (supporting member)
12a Support part 13 Hinge part (connector)
20 1st bracket 21 1st connecting tool 22 2nd bracket 23 2nd connecting tool 23a lever 24 wire 25 rotation center 26 vertical line 27 center of gravity 30 connecting plate 30a side part 30b side part 31 hinge part (connecting tool)
32 Stopper 40 Front guard 40a Pipe material 40a1 Horizontal part 40a2 Bent part 40b Recessed part

Claims (5)

A traveling body, a revolving body disposed on the traveling body and having a rear end formed to be able to swivel within a vehicle width of the traveling body, and provided at a front side position of the revolving body so as to be swingable in a lateral direction. A swing post, a work device including a boom attached to the swing post and pivotable in a vertical direction, a driver seat disposed on the swing body, a roof covering the driver seat, and the roof are supported. A canopy having a plurality of support columns; a counterweight disposed at a rear portion of the revolving structure; an engine room disposed below the driver's seat; and the traveling installed at a position in front of the driver's seat of the revolving structure. A pair of travel levers for operating the body, and an openable / closable front guard disposed between the pair of travel levers and a base end portion of the boom of the working device and preventing foreign objects from flying into the driver's seat , Said swirl In small hydraulic excavator provided with a supporting member provided on the body for supporting the front guard,
The front guard has a hollow portion that avoids interference with the boom when the boom of the working device is in the highest position, and the height position of the hollow portion is higher than the upper ends of the pair of travel levers. Set
The indented portion is at least an intermediate portion in the vertical direction of the front guard, and is formed so as to enter the driver's seat side from a lower side located at a front end portion of the revolving structure, and the intermediate portion of the front guard. The upper side above the part limits the amount of entry so that the amount of entry is smaller than the amount of entry to the driver's seat side from at least the lower side to the intermediate part side,
The intermediate portion is located above the pair of travel levers and the operating lever for operating the swivel and the working device disposed adjacent to the left and right positions of the front portion of the driver seat, A compact hydraulic excavator, which is set at a position where a space for allowing the back bent portion of the boom to enter when the back bent portion of the boom is closest to the front guard in the upmost state. The small hydraulic excavator according to claim 1,
The small-sized hydraulic excavator, wherein the support member includes a support portion that rotatably supports the front guard, and includes a connector that rotatably connects the front guard to the support portion. The small excavator according to claim 2,
The front guard includes a lattice-shaped portion in which the recessed portion is formed, and a holding member that is disposed around the lattice-shaped portion and holds the lattice-shaped portion. The small hydraulic excavator according to claim 3,
The support portion of the support member extends in the horizontal direction,
Comprising a restricting part for restricting the front guard from falling forward;
The restricting portion can be engaged with and disengaged from a first bracket attached to the front guard, a first connector fixed to the first bracket, a second bracket attached to the canopy, and the first connector. A small hydraulic excavator, comprising: a second connecting tool provided on the second bracket and fixed to the second bracket; and a wire having one end connected to the first bracket and the other end connected to the second bracket. The small hydraulic excavator according to claim 4,
The canopy comprises a three-column canopy having a single column on the right front side of the driver's seat and two columns on the rear side of the driver's seat.