JP2018199964A - Small size hydraulic shovel - Google Patents

Abstract

To protect an operator seated in a driver seat, and to secure an upper visual field during work.SOLUTION: On an outside surface 6A of a counterweight 6, a left post support member 6B and a right post support member 6C are provided being separated in the left and right direction. Also, a protection member 13 is constituted by including: a left post 14 which is made of a bar-like body extending vertically and whose lower end is mounted on the left post support member 6B; a right post 19 which is made of a bar-like body extending vertically and whose lower end is mounted on a right post support member 6C; and an eaves member 23 mounted on an upper end of the left post 14 and an upper end of the right post 19 via angle adjustment mechanisms 33 respectively, and projecting above a driver seat 9 in a state where mounting angles with respect to the left post 14 and the right post 19 can be adjusted.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a small hydraulic excavator provided with a protective member for protecting an operator sitting in a driver's seat, for example.

  The hydraulic excavator includes a small hydraulic excavator for performing work in a narrow work site or the like. This small hydraulic excavator is usually called a mini excavator, and is used for dismantling work inside a building or excavation work in a narrow street. Some small hydraulic excavators have, for example, a machine weight reduced to about 1 ton. In this small hydraulic excavator, the entire vehicle body including the lower traveling body and the upper swing body is formed compact.

  The small hydraulic excavator is composed of a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a front device that is provided so as to be able to move up and down on the front side of the upper revolving body. Yes.

  The upper swing body has a swing frame provided with a front device bracket to which the base end of the front device is attached on the front side, a counterweight attached to the rear portion of the swing frame to balance the weight of the front device, and a front side of the counterweight. An engine as a prime mover located on the revolving frame, an engine cover that can be opened and closed forward and backward with the position of the counterweight as a fulcrum to cover the engine from above, and an engine cover A driver's seat provided on the front side of the engine cover and a floor board that forms a scaffold for an operator seated on the driver's seat provided on the driver's seat with a gap between the driver's seat and an upper / lower direction The swivel frame is located behind the front device bracket and protrudes upward from the floor plate. Located on the front side of the counter stand and the lever stand with the operating lever for operating the front device, the outer periphery between the swivel frame and the floor board is surrounded by the left side, right side, and front side. An exterior cover and a protective member that is provided on the rear side of the upper swing body and protects an operator seated on the driver's seat are provided.

  The protective member consists of a rod-shaped body that extends upward and downward, and a lower end that is attached to the left side of the upper part of the upper revolving unit. It is known to include an attached right column and an eaves member attached to each of the upper end of the left column and the upper end of the right column and projecting forward from each column toward the upper side of the driver's seat. (For example, refer to Patent Document 1).

JP 2000-309946 A

  By the way, the small hydraulic excavator is used not only for excavation work outdoors but also for indoor work such as building dismantling work. In the dismantling work, there is a case where the front device is extended upward to dismantle a high position. In this case, the operator seated in the driver's seat performs the operation while visually observing the work tool of the front device located above. However, since the guard member of the protective member is provided above the driver's seat, there is a problem that the upper field of view is limited by the guard member.

  The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to protect an operator seated in a driver's seat and to ensure an upward field of view during work. Is to provide.

  The present invention comprises a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a front device that is provided so as to be able to move up and down on the front side of the upper revolving body, The upper swing body includes a swing frame provided with a front device bracket to which a base end of the front device is attached on the front side, a counterweight attached to a rear portion of the swing frame and balancing the weight of the front device, A prime mover provided on the revolving frame located on the front side of the counterweight, and a prime mover cover provided so as to be openable and closable forward and backward with the position of the counterweight as a fulcrum to cover the prime mover from above There is also an upward and downward gap between the driver seat provided on the prime mover cover and the swivel frame located on the front side of the prime mover cover. A floor plate which is provided on the swivel frame and forms a scaffold for an operator seated on the driver's seat, and is provided in a state of projecting upward from the floor plate, located behind the front device bracket of the swivel frame A lever stand having an operation lever for operating the front device, and a front side of the counterweight, and an outer periphery between the swivel frame and the floor plate is taken from three surfaces of a left side surface, a right side surface, and a front surface. In a small hydraulic excavator comprising an outer cover provided in an enclosed manner, and a protective member that is provided on the rear side of the upper swing body and protects an operator seated on the driver's seat, on the outer surface of the counterweight, A left column support member and a right column support member are provided separately from each other in the left and right directions, and the protection member is formed of a rod-like body extending in the upward and downward directions. A left column having a lower end attached to the left column support member, a right column comprising a rod-like body extending upward and downward, and a lower end attached to the right column support member, an upper end of the left column and the right column And an eaves member that is attached to the upper end of each of the left and right ends via an angle adjusting mechanism and projects above the driver's seat in a state in which the attachment angle with respect to the left strut and the right strut can be adjusted.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to protect the operator who seated in the driver's seat, an upper visual field can be ensured at the time of work.

It is a front view which shows the small hydraulic excavator applied to embodiment of this invention. It is the perspective view which looked at the small hydraulic excavator of FIG. 1 from the diagonal rear side in the state which abbreviate | omitted the front apparatus. It is a disassembled perspective view which shows the small hydraulic excavator of FIG. 2 in the state which isolate | separated the protection member. It is a front view which shows the small hydraulic excavator which abbreviate | omitted the front apparatus in the state which removed the protection member and opened the engine cover. It is a perspective view which expands and shows a turning frame alone. It is a perspective view which expands and shows a turning frame and an exterior cover. It is a disassembled perspective view shown in the state which decomposed | disassembled the protection member. It is a perspective view of the principal part expansion which shows the connection mechanism and angle adjustment mechanism of a protection member in the state which omitted the handle. It is a disassembled perspective view which decomposes | disassembles and shows the connection mechanism and angle adjustment mechanism of a protection member in the state which abbreviate | omitted the handle.

  Hereinafter, as a representative example of the small hydraulic excavator according to the embodiment of the present invention, a small hydraulic excavator (ultra-mini excavator) provided with a swing type (oscillating type) front device is taken as an example, and according to FIGS. 1 to 9. This will be described in detail.

  1 to 4, a small hydraulic excavator 1 includes a crawler-type lower traveling body 2 capable of self-propelling, an upper revolving body 3 that is turnably mounted on the lower traveling body 2, and a front side of the upper revolving body 3. And a swing-type front device 4 provided so as to be able to move up and down. Here, the small excavator 1 is an ultra-mini excavator having a machine weight (total weight) of about 1 ton, for example, so that it can be used for dismantling work inside a building or excavation work in a narrow place such as a street. It is configured as.

  The front device 4 includes a swing post 4A attached to a front device bracket 5G of a revolving frame 5 to be described later so as to be swingable in the left and right directions, and a boom 4B having a base end attached to the swing post 4A so as to be movable up and down. The arm 4C attached to the tip of the boom 4B so as to be able to move up and down, the bucket 4D attached to the tip of the arm 4C so as to be rotatable, the boom cylinder 4E that moves up and down the boom 4B, and the arm 4C up and down. An arm cylinder 4F and a bucket cylinder 4G that rotates the bucket 4D are included. A swing cylinder (not shown) that swings the swing post 4A leftward and rightward is provided between the swing post 4A and the swing frame 5. The front device 4 can be operated by expanding and contracting these cylinders 4E, 4F, and 4G.

  The upper swing body 3 includes a swing frame 5, a counterweight 6, an engine 7, an engine cover 8, a driver's seat 9, a floor board 10, a lever stand 11, an exterior cover 12, and a protective member 13.

  As shown in FIG. 5, the revolving frame 5 extends in a V shape so as to approach each other toward the front side on the bottom plate 5A and a bottom plate 5A made of a thick metal plate having a rectangular shape extending in the forward and backward directions. A left front vertical plate 5B and a right front vertical plate 5C, a horizontal plate 5D which is located at the rear of each front vertical plate 5B and 5C and extends left and right, and left and right. The left rear vertical plate 5E and the right rear vertical plate 5F extending from the horizontal plate 5D to the rear side with an interval are included.

  A front device bracket 5G is provided on the front side of the swivel frame 5, that is, on the front part of the left front vertical plate 5B and the right front vertical plate 5C, protruding forward from the front end of the bottom plate 5A. The front device bracket 5G supports a swing post 4A constituting the base end of the front device 4 so as to be swingable in the left and right directions.

  On the other hand, on the rear side of the revolving frame 5, four engine mounting brackets are located at the upper positions of the horizontal plate 5D, the left rear vertical plate 5E, and the right rear vertical plate 5F and spaced apart in the front, rear and left and right directions. 5H is provided. Each engine mounting bracket 5H constitutes a prime mover mounting bracket and supports the engine 7 via a vibration isolation mount.

  The counterweight 6 is attached to the rear part of the turning frame 5. This counterweight 6 balances the weight with the front device 4 and is formed as a heavy object made of an iron-based material. Here, as shown in FIG. 2, the outer surface 6 </ b> A (rear circumferential surface) of the counterweight 6 is formed as a curved surface in which the center in the left and right directions protrudes rearward. As shown in FIG. 3, on the outer side surface 6A, a left column support member 6B is provided at a position below the driver's seat 9 behind the driver's seat 9 in the left and right direction, that is, at a position below the driver's seat 9, that is, on the left side of the outer surface 6A. A right column support member 6C is provided at a right position of the outer surface 6A.

  The left column support member 6B forms a flat mounting surface to which the mounting plate 15A of the lower column portion 15 constituting the left column 14 of the protection member 13 described later is mounted. The left column support member 6B is provided with, for example, two screw holes 6B1 with an interval in the upward and downward directions. On the other hand, the right column support member 6C, like the left column support member 6B, forms a flat mounting surface on which a mounting plate 20A of the lower column portion 20 of the right column 19 described later is mounted, and is spaced upward and downward. For example, it has two screw holes 6C1.

  Further, as shown in FIG. 4, a hinge member 8 </ b> C described later is attached to the upper surface 6 </ b> D of the counterweight 6. Thereby, the below-mentioned engine cover 8 can be supported via the hinge member 8C so as to be opened and closed.

  The engine 7 constitutes a prime mover and is provided on the turning frame 5 on the front side of the counterweight 6 (see FIG. 4). The engine 7 is arranged in a horizontally placed state extending in the left and right directions, and is mounted on each engine mounting bracket 5H of the revolving frame 5 via an anti-vibration mount. The engine 7 drives a hydraulic pump (not shown). As the prime mover, a hybrid prime mover composed of an engine and an electric motor, or an electric motor can be used.

  The engine cover 8 covers the engine 7 as a prime mover, a hydraulic pump and the like from above, and constitutes a prime mover cover. The engine cover 8 is formed as a prone cover in which the upper side of the square cylindrical peripheral surface portion 8A is closed by the upper surface portion 8B. The engine cover 8 is attached to the upper surface 6D of the counterweight 6 through the hinge member 8C at the rear portion of the peripheral surface portion 8A. As a result, the engine cover 8 can be opened and closed forward and backward with the fulcrum 8D positioned above the upper surface 6D of the counterweight 6 as the center.

  The driver's seat 9 is provided on the upper surface portion 8B of the engine cover 8. The driver's seat 9 is seated by an operator who operates the small excavator 1. An operator seated in the driver's seat 9 is protected by a protective member 13 described later when the small excavator 1 is operated.

  The floor board 10 forms a scaffold for an operator seated on the driver's seat 9 and is disposed on the front side of the engine cover 8. The floor plate 10 is provided on the revolving frame 5 with a gap in the upward and downward directions between the bottom plate 5A of the revolving frame 5 and the bottom plate 5A.

  The lever stand 11 is provided behind the front device bracket 5 </ b> G of the revolving frame 5, that is, in a state of protruding upward from the floor plate 10 at a position on the front side of the floor plate 10. The lever stand 11 is positioned at the center of the floor plate 10 in the left and right directions, and the stand main body 11A is erected on the floor plate 10, and the left work operation is provided on the upper portion of the stand main body 11A so as to be separated in the left and right directions. A lever 11B, a right work operation lever 11C, and left and right travel operation levers 11D which are positioned between the work operation levers 11B and 11C and are provided on the upper portion of the stand body 11A so as to be pivotable forward and backward. It is configured. The left and right work operation levers 11B and 11C can be tilted forward and backward and left and right. The left and right work operation levers 11B and 11C can operate the front device 4 and the like by tilting.

  The exterior cover 12 is located in front of the counterweight 6 and is provided between the turning frame 5 and the floor board 10. As shown in FIG. 6, the exterior cover 12 includes a left cover portion 12 </ b> A and a right cover portion 12 </ b> B that are disposed so as to surround the outer periphery of the revolving frame 5. The left cover portion 12A is formed as an L-shaped bent plate by a left side surface 12A1 that covers the left side of the revolving frame 5 and a front surface 12A2 that is bent rightward from the front end of the left side surface 12A1 and covers the front side of the revolving frame 5. Yes. On the other hand, the right cover portion 12B is symmetrical with the left cover portion 12A in the left and right directions, and is formed as an L-shaped bent plate from the right side surface 12B1 and the front surface 12B2. Thereby, the exterior cover 12 can surround the revolving frame 5 and the floor board 10 from the three surfaces of the left side surface, the right side surface, and the front surface.

  Next, the configuration, the mounting structure, and the angle adjustment work for the protective member 13 that is a characteristic part of the present invention will be described.

  The configuration and mounting structure of the protection member 13 will be described. The protection member 13 is provided on the rear side of the upper swing body 3 and protects the operator seated on the driver's seat 9. The protection member 13 is formed by connecting rod-like bodies (pipe materials) that have been bent into a desired shape, and is called a roll over bar or a roll bar. The protection member 13 includes a left column 14, a right column 19, a flange member 23, and an angle adjustment mechanism 33.

  The left column 14 is formed as a rod-like body extending upward and downward. As shown in FIG. 7, the left column 14 is divided into a lower column portion 15 and an upper column portion 17 at an intermediate position in the length direction (up and down direction).

  The lower column portion 15 of the left column 14 is formed on the basis of a rod-like body extending upward and downward, specifically, a metal round pipe material. A mounting plate 15A is fixed to the lower end of the lower column portion 15 so as to face the left column support member 6B of the counterweight 6. In the mounting plate 15A, two bolt insertion holes 15B are formed at positions corresponding to the screw holes 6B1 of the left column support member 6B.

  On the other hand, a connecting cylinder portion 15 </ b> C having a smaller diameter than the diameter of the lower column 15 is provided on the upper end of the lower column 15 so as to protrude upward. The connecting cylinder portion 15 </ b> C is inserted into the insertion opening 17 </ b> A at the lower end of the upper column portion 17. The connecting cylinder portion 15C is provided with pin insertion holes 15D penetrating in the diametrical direction at, for example, two places spaced apart in the upward and downward directions.

  When the lower column portion 15 is attached to the counterweight 6, the attachment plate 15 </ b> A of the lower column portion 15 is disposed facing the left column support member 6 </ b> B of the counterweight 6. In this state, the bolt 16 inserted into each bolt insertion hole 15B is screwed into the screw hole 6B1 of the left column support member 6B. As a result, the lower column portion 15 can be attached to the left side position of the counterweight 6 while extending upward.

  Here, as shown in FIGS. 1 and 2, the lower column portion 15 is attached to the left side of the counterweight 6, and the boundary portion between the engine cover 8 and the driver seat 9 (the upper surface portion of the engine cover 8). A bent portion 15E is provided in the vicinity of 8B. The bent portion 15E is formed as a crank-like bent structure that extends upward while being bent away from the driver's seat 9.

  The upper column portion 17 of the left column 14 extends upward and downward while the upper side is bent inward in the left and right directions from the middle portion in the upper and lower directions. The upper column portion 17 is formed using a metal round pipe material similar to the lower column portion 15. The lower end of the upper column portion 17 is an insertion opening 17A into which the connecting cylinder portion 15C of the lower column portion 15 is inserted. In addition, the pin insertion hole 17B penetrates in the diametrical direction at two locations corresponding to each pin insertion hole 15D in a state where the connecting cylinder portion 15C of the lower column portion 15 is inserted below the upper column portion 17. Is provided. On the other hand, at the upper end of the upper column portion 17, a left column side joint 28 of a coupling mechanism 27 described later is provided.

  The upper column portion 17 inserts the connecting cylinder portion 15C of the lower column portion 15 into the insertion opening 17A on the lower end side, and enters each pin insertion hole 17B of the upper column portion 17 and each pin insertion hole 15D of the lower column portion 15. The fixing pin 18 is inserted. Thereby, the lower pillar part 15 and the upper pillar part 17 can be connected as one rod-shaped body. The fixing pin 18 has a retaining function by a retaining pin, a retaining ring, or the like.

  On the other hand, the right column 19 of the protection member 13 is formed as a rod-like body extending upward and downward. The right column 19 is symmetrical with the left column 14 in the left and right directions. That is, the right column 19 is composed of a lower column portion 20 and an upper column portion 21. The lower column part 20 has a mounting plate 20A, a bolt insertion hole 20B, a connecting cylinder part 20C, a pin insertion hole 20D, and a bent part 20E. The upper column part 21 has an insertion opening 21A and a pin insertion hole 21B.

  The lower column portion 20 and the upper column portion 21 can be connected as a single rod-like body by the fixing pin 22. Further, the lower column portion 20 is arranged with the mounting plate 20 </ b> A facing the right column support member 6 </ b> C of the counterweight 6. In this state, the bolt 16 inserted into each bolt insertion hole 20B is screwed into the screw hole 6C1 of the right column support member 6C. Accordingly, the lower column portion 20 can be attached to the right position of the counterweight 6 so as to extend upward.

  The eaves member 23 is attached to the upper end of the left column 14 and the upper end of the right column 19, that is, the upper end of each upper column part 17, 21 via a coupling mechanism 27 and an angle adjusting mechanism 33 described later. The eaves member 23 protrudes above the driver's seat 9 in a state in which the attachment angle with respect to each of the columns 14 and 19 can be adjusted. The eaves member 23 is formed in a U shape using a metal round pipe material. The flange member 23 is located on the left angle adjustment mechanism 33A side and supported by the connecting shaft 30, and the starboard member 24 is positioned on the right angle adjustment mechanism 33B side and supported on the connection shaft 30. 25 and two members. Note that a roof member (not shown) that covers the upper side of the driver's seat 9 can be attached to the eaves member 23.

  The port member 24 of the flange member 23 is formed in a J shape by bending the front side of a metal round pipe member extending in the front and rear directions to the right side. The front end of the port member 24 is an insertion opening 24A that opens to the right. Further, a first bracket 24B is provided at a position of the insertion opening 24A of the port member 24. The first bracket 24B is a plate that protrudes rearward and extends to the right side beyond the insertion opening 24A. The first bracket 24B is provided with a bolt insertion hole 24C.

  The starboard member 25 is formed in a J shape by bending the front side of a metal round pipe member extending in the front and rear directions to the left side so as to be symmetrical with the port member 24 in the left and right directions. ing. The front end of the starboard member 25 is an insertion cylinder portion 25A that protrudes leftward and is inserted into the insertion opening 24A. Further, the starboard member 25 is provided with a second bracket 25B at a position overlapping the first bracket 24B in a state where the insertion cylinder portion 25A is inserted into the insertion opening 24A. The second bracket 25B is provided with a screw hole 25C at a position corresponding to the bolt insertion hole 24C of the first bracket 24B.

  The port member 24 and the starboard member 25 insert the insertion tube portion 25 </ b> A of the starboard member 25 into the insertion opening 24 </ b> A of the port member 24. In this state, the bolt 26 inserted into the bolt insertion hole 24C of the first bracket 24B of the port member 24 is screwed into the screw hole 25C of the second bracket 25B of the starboard member 25. Thereby, the flange member 23 can be assembled by connecting the port member 24 and the starboard member 25.

  The connection mechanism 27 connects the left support | pillar 14, the right support | pillar 19, and the collar member 23 so that rotation is possible. The connection mechanism 27 includes a left column side joint 28, a right column side joint 29, a connection shaft 30, a port side joint 31, and a starboard side joint 32.

  As shown in FIGS. 8 and 9, the left support column side joint 28 is provided at the upper end of the upper column part 17 constituting the left support column 14. The left column side joint 28 has a rectangular base plate 28A extending in the horizontal direction at the upper end of the upper column part 17, and is positioned on the left and right sides of the base plate 28A in the front and rear directions. The shaft mounting plate 28B extends and stands, and the reinforcing plate 28C stands on the base plate 28A so as to extend outward from the shaft mounting plate 28B in the left and right directions. The shaft attachment plate 28B is provided with a shaft insertion hole 28D penetrating in the left and right directions so as to be located immediately above the reinforcing plate 28C. The shaft mounting plate 28B is provided with a left column-side first pin hole 34 and a left column-side second pin hole 35 which will be described later.

  The right column side joint 29 is provided at the upper end of the upper column part 21 that constitutes the right column 19. The right strut side joint 29 is symmetrical with the left strut side joint 28 in the left and right directions. That is, the right column side joint 29 includes a base plate 29A, a shaft mounting plate 29B, a reinforcing plate 29C, and a shaft insertion hole 29D. The shaft mounting plate 29B is provided with a right column-side first pin hole 38 and a right column-side second pin hole 39, which will be described later.

  The connecting shaft 30 extends in the left and right directions and connects the left strut side joint 28 and the right strut side joint 29. The connecting shaft 30 is formed as a pipe material extending linearly in the left and right directions. The connecting shaft 30 has a left end portion 30A side that passes through the shaft insertion hole 28D of the left support column side joint 28, and a tip end of the connecting shaft 30 that extends to the left side beyond the reinforcing plate 28C. On the other hand, the right end portion 30B side of the connecting shaft 30 passes through the shaft insertion hole 29D of the right column side joint 29, and the tip thereof extends to the right side beyond the reinforcing plate 29C. The connecting shaft 30 is fixed to the shaft mounting plates 28B and 29B and the reinforcing plates 28C and 29C using welding means.

  The port side joint 31 is provided at the rear end of the port member 24 constituting the rod member 23. The port side joint 31 is inserted through the left end 30A of the connecting shaft 30 so as to be rotatable. The port side joint 31 includes a rectangular base plate 31A provided orthogonally so as to close the rear end of the port member 24, and a rear side from the base plate 31A with a left-right spacing. And two shaft mounting plates 31B extending in the direction. Each shaft attachment plate 31 </ b> B extends downward so that the tip side extending rearward is curved. Each shaft mounting plate 31B is provided with a shaft insertion hole 31C penetrating in the left and right directions. Also, a port side pin hole 36 to be described later is provided on the tip side of each shaft mounting plate 31B.

  The starboard side joint 32 is provided at the rear end of the starboard member 25 constituting the flange member 23. The starboard side joint 32 is inserted through the right end 30B of the connecting shaft 30 so as to be rotatable. The starboard side joint 32 is constituted by a base plate 32A and two shaft mounting plates 32B in the same manner as the port side joint 31. Each shaft mounting plate 32B is provided with a shaft insertion hole 32C penetrating in the left and right directions. Further, a starboard side pin hole 40 to be described later is provided on the tip side of each shaft mounting plate 32B.

  The coupling mechanism 27 integrally connects the upper portion of the upper column portion 17 of the left column 14 and the upper portion of the upper column portion 21 of the right column 19 by the left column side joint 28, the right column side joint 29 and the coupling shaft 30. ing. Then, the left end 30 </ b> A of the connecting shaft 30 is inserted into the shaft insertion hole 31 </ b> C of the port side joint 31, and the right end 30 </ b> B of the connecting shaft 30 is inserted into the shaft insertion hole 32 </ b> C of the starboard side joint 32. Thereby, the connection mechanism 27 can connect the collar member 23 to the left support column 14 and the right support column 19 so as to be rotatable about the axis OO of the connection shaft 30.

  Next, the configuration of the angle adjusting mechanism 33 and the angle adjusting operation, which are characteristic portions of the present invention, will be described in detail.

  The angle adjustment mechanism 33 adjusts the attachment angle of the flange member 23 with respect to the left column 14 and the right column 19. In the angle adjustment mechanism 33 according to the present embodiment, the attachment angle of the eaves member 23 to the left column 14 and the right column 19 can be adjusted in a plurality of stages, for example, two stages in the upward and downward directions. Specifically, as shown in FIG. 1, the angle adjustment mechanism 33 rotates the mounting angle of the eaves member 23 in a normal position (position indicated by a solid line) that is horizontal and a front side of the normal position upward. It can be adjusted to two angular positions with the high work position (position indicated by a two-dot chain line).

  As shown in FIGS. 7 to 9, the angle adjustment mechanism 33 includes a left angle adjustment mechanism 33 </ b> A that is rotatably provided between the left column 14 and the flange member 23 via a connecting shaft 30, the right column 19, and the like. A right angle adjustment mechanism 33 </ b> B is provided between the flange member 23 and the hook member 23 so as to be rotatable via the connecting shaft 30.

  The left angle adjusting mechanism 33 </ b> A includes a left column side first pin hole 34, a left column side second pin hole 35, a port side pin hole 36, and a left engagement pin 37 which will be described later.

  The left strut-side first pin hole 34 constitutes a left strut-side pin hole, and is formed through the shaft mounting plate 28B of the left strut-side joint 28 in the left and right directions. The left strut-side first pin hole 34 is arranged on a circumference centered on the axis OO of the connecting shaft 30, that is, on a virtual circle C indicated by a one-dot chain line in FIG. The left strut-side first pin hole 34 is inserted with the left engagement pin 37 when the attachment angle of the flange member 23 is fixed at a normal position that is horizontal. Here, the left column-side first pin hole 34 is located on the same axis as the port-side pin hole 36 provided in the port-side joint 31 when the rod member 23 is horizontally disposed, specifically, Is arranged in the vicinity of the rear edge at the middle part of the upper and lower shaft mounting plates 28B.

  The left strut-side second pin hole 35 constitutes a left strut-side pin hole, and is closer to the front side (reinforcing plate 28C) than the left strut-side first pin hole 34 to the shaft mounting plate 28B of the left strut-side joint 28. Is located. The left column-side second pin hole 35 is disposed on the virtual circle C, similarly to the left column-side first pin hole 34. The left strut-side second pin hole 35 is inserted with the left engagement pin 37 when the attachment angle of the eaves member 23 is fixed at a high work position rotated forward from the normal position. . Here, when the port-side second pin hole 35 is inclined so that the front side of the flange member 23 is raised, the port-side second pin hole 35 is located on the same axis as the port-side pin hole 36 on the port-side joint 31 side. Has been placed.

  The port side pin holes 36 are formed through the respective shaft mounting plates 31B of the port side joint 31 in the left and right directions, respectively. Each port side pin hole 36 is disposed on the virtual circle C described above on the tip side of each shaft mounting plate 31B. Here, each port side pin hole 36 is inserted with a left engagement pin 37 described later. At this time, the port side pin hole 36 is formed in the shaft mounting plate 31B spaced apart in the left and right directions, thereby suppressing the inclination of the left engagement pin 37 and connecting the left engagement pin 37 to the connecting shaft. It can be held in parallel with 30 axes OO.

  The left engagement pin 37 is inserted between any one of the left column side first pin hole 34 and the left column side second pin hole 35 and the port side pin hole 36. . The left engaging pin 37 has a retaining function by a retaining pin, a retaining ring or the like, like the fixing pin 18 described above.

  Similarly to the left angle adjustment mechanism 33A, the right angle adjustment mechanism 33B includes a right column side first pin hole 38, a right column side second pin hole 39, a starboard side pin hole 40, and a right engagement pin 41, which will be described later. Has been.

  The right strut-side first pin hole 38 is formed in the shaft mounting plate 29B of the right strut-side joint 29. The right strut-side first pin hole 38 has the same position and function as the left strut-side first pin hole 34, and therefore description thereof is omitted. Also, the right strut-side second pin hole 39 has the same position and function as the left strut-side second pin hole 35, and thus the description thereof is omitted. The right strut-side first pin hole 38 and the right strut-side second pin hole 39 constitute a right strut-side pin hole.

  The starboard side pin hole 40 is formed through each shaft mounting plate 32B of the starboard side joint 32 in the left and right directions, respectively. Since each starboard side pin hole 40 has the same position and function as each port side pin hole 36, description is abbreviate | omitted.

  The right engagement pin 41 is inserted between any one of the right column side first pin hole 38 and the right column side second pin hole 39 and the starboard side pin hole 40. . Similarly to the left engagement pin 37, the right engagement pin 41 has a retaining function by a retaining pin, a retaining ring, or the like.

  Next, an example of a work procedure when the angle of the collar member 23 with respect to the left column 14 and the right column 19 is adjusted by the angle adjustment mechanism 33 (the left angle adjustment mechanism 33A and the right angle adjustment mechanism 33B) will be described.

  First, when performing excavation work on the ground, the eaves member 23 is held in a horizontal state. In this state, the left angle adjusting mechanism 33A arranges the left column-side first pin hole 34 and the port side pin hole 36 on the same axis. Then, the left engagement pin 37 is inserted over the left column-side first pin hole 34 and the port side pin hole 36. Similarly, the right angle adjustment mechanism 33 </ b> B inserts the right engagement pin 41 across the right column side first pin hole 38 and the starboard side pin hole 40. Thereby, the angle adjustment mechanism 33 can fix the collar member 23 in the normal position which becomes horizontal.

  On the other hand, when dismantling a high position such as a wall, it is necessary to widen the upper field of view. Therefore, the respective engagement pins 37 and 41 are pulled out and the front side of the flange member 23 is rotated upward. The left angle adjusting mechanism 33A has the left column side second pin hole 35 and the port side pin hole 36 arranged on the same axis, and extends across the left column side second pin hole 35 and the port side pin hole 36. The left engagement pin 37 is inserted. Similarly, the right angle adjustment mechanism 33 </ b> B inserts the right engagement pin 41 across the right column side second pin hole 39 and the starboard side pin hole 40. Thereby, as shown with a dashed-two dotted line in FIG. 1, the eaves member 23 can be fixed to the high work position which inclined upwards toward the front side. At the high working position of the flange member 23, a wide upper field of view can be provided to the operator.

  The handle 42 is provided on each of the upper end side of the left column 14 and the upper end side of the right column 19. The handle 42 is provided on the lower side of the angle adjusting mechanism 33, that is, on the front side of the upper portions of the upper column portions 17 and 21. Thereby, the operator can get on and off stably by gripping the handle 42 when getting on and off the driver's seat 9.

  The earth removal device 43 is provided on the front side of the lower traveling body 2 so as to be rotatable upward and downward. The earth removal device 43 is used to acclimate the ground or perform earth removal work.

  The small excavator 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  The operator can travel the lower traveling body 2 by sitting on the driver's seat 9 and operating the travel operation lever 11D of the lever stand 11. On the other hand, when the operator operates the left and right work operation levers 11B and 11C, the turning operation of the upper turning body 3, the excavation work of earth and sand by the front device 4, and the like can be performed.

  Further, when performing maintenance of the engine 7, each bolt 16 is loosened and the left column 14 and the right column 19 are removed from the counterweight 6. In this state, the front side of the engine cover 8 is grasped and lifted. As a result, as shown in FIG. 4, the engine cover 8 can be opened upward or rearward with the fulcrum 8D at the position of the counterweight 6 as the center. When the engine cover 8 is opened, the engine 7 can be exposed and maintenance of the engine 7 can be performed.

  Thus, according to the present embodiment, the left strut support member 6B and the right strut 6 are provided on the outer surface 6A of the counterweight 6 so as to be spaced apart in the left and right directions and behind the back of the driver seat 9 and below the driver seat 9. Support member 6C is provided. Further, the protective member 13 is composed of a rod-like body extending upward and downward, and a lower column 14 having a lower end attached to the left column support member 6B, and a rod-like body extending upward and downward, and the lower end thereof is a right column support member 6C. Are attached to the right strut 19 attached to the upper end of the left strut 14 and the upper end of the right strut 19 via the angle adjusting mechanism 33, respectively, and the attachment angle to the left strut 14 and the right strut 19 can be adjusted. And a flange member 23 that projects from the position of the angle adjustment mechanism 33 to a position above the driver's seat 9.

  Therefore, even when the small hydraulic excavator 1 falls, the protection member 13 can secure the operator's living space and can protect the operator. Then, when dismantling a high position such as a wall, the respective engagement pins 37 and 41 constituting the angle adjustment mechanism 33 are pulled out, the front side of the flange member 23 is rotated upward, A left engagement pin 37 is inserted over the pin hole 35 and the port side pin hole 36. Similarly, the right engagement pin 41 is inserted over the right column side second pin hole 39 and the starboard side pin hole 40. Thereby, the eaves member 23 can be fixed to the high work position inclined upward toward the front side.

  As a result, the protection member 13 can protect the operator seated on the driver's seat 9. Moreover, the protective member 13 can adjust the angle of the eaves member 23 to the high working position by the angle adjusting mechanism 33, so that it can provide the operator with a wide upper field of view and improve workability such as dismantling work. be able to.

  The left column side joint 28 provided at the upper end of the left column 14, the right column side joint 29 provided at the upper end of the right column 19, and the left column side joint 28 and the right column side joint 29 are connected to the left. , A connecting shaft 30 extending in the right direction, a port side joint 31 provided at the left rear end of the flange member 23 and through which the left end portion 30A of the connection shaft 30 is rotatably inserted, and provided at the right rear end of the flange member 23. And a starboard side joint 32 through which the right end 30B of the connecting shaft 30 is rotatably inserted. In addition, the angle adjusting mechanism 33 is formed on the left strut side joint 28 and the right strut side joint 29, respectively, and is arranged on the left strut side first (on the virtual circle C) centered on the connecting shaft 30. A pin hole 34, a left column side second pin hole 35, a right column side first pin hole 38, a right column side second pin hole 39, a port side joint 31, and a starboard side joint 32 are formed on the circumference. Port side pin hole 36, starboard side pin hole 40, left strut side first pin hole 34, left strut side second pin hole 35 and port side pin hole 36, and right strut Mounting angle of the port side joint 31 and the starboard side joint 32 with respect to the connecting shaft 30 by being inserted between the side first pin hole 38, the right column side second pin hole 39 and the starboard side pin hole 40, respectively. The left engagement pin 37 and the right engagement pin 41 are set.

  Then, two left column side first pin holes 34 and a left column side second pin hole 35 are provided as left column side pin holes, and one port side pin hole 36 is provided. Similarly, two right strut side first pin holes 38 and right strut side second pin holes 39 are provided as right strut side pin holes, and one starboard side pin hole 40 is provided.

  Thereby, the insertion position of the left engagement pin 37 is set to the left column side first pin hole 34 or the left column side second pin hole 35, and the insertion position of the right engagement pin 41 is set to the right column side first pin hole 38 or the right side. By setting it as the support | pillar side 2nd pin hole 39, the collar member 23 can be adjusted to two angular positions (2 steps | paragraphs) with the normal position which becomes horizontal, and the high place work position where the front side became high.

  The connecting shaft 30 includes a single connecting shaft that connects the left support column 14 and the eaves member 23 and the right support column 19 and the eaves member 23. On this, the flange member 23 is located on the left angle adjusting mechanism 33A side and supported by the connecting shaft 30, and on the right angle adjusting mechanism 33B side is supported on the connecting shaft 30 and on the right side. It is comprised by two members with the collar member 25. FIG.

  Therefore, the left end 30A of the connecting shaft 30 is inserted into the shaft insertion hole 31C of the port side joint 31 provided in the port member 24, and the shaft insertion hole 32C of the starboard side joint 32 provided in the starboard member 25. The right end 30B of the connecting shaft 30 is inserted into In this state, the port member 24 and the starboard member 25 are connected using the bolts 26. Thereby, the eaves member 23 can be rotatably attached to the connecting shaft 30 in a retaining state.

  Of the left column 14 and the right column 19, a boundary portion between the engine cover 8 and the driver seat 9, that is, an upper portion of each lower column portion 15, 20 is bent upwardly away from the driver seat 9. Bending portions 15E and 20E extending in the direction are respectively provided. Thereby, the left support | pillar 14 and the right support | pillar 19 can be released | separated from the operator who seated in the driver's seat 9, and living space can be expanded and comfortability can be made favorable.

  Further, on the upper end sides of the left column 14 and the right column 19, a handle 42 is provided below the angle adjusting mechanism 33, respectively. Therefore, the operator can grip the handle 42 when getting on and off the driver's seat 9.

  In the embodiment, the left column side joint 28 is provided with two left column side first pin holes 34 and a left column side second pin hole 35 along the virtual circle C. Similarly, the right strut-side joint 29 is provided with two right strut-side first pin holes 38 and a right strut-side second pin hole 39. Further, the port side joint 31 is provided with one port side pin hole 36 located on the virtual circle C. Similarly, the starboard side joint 32 is illustrated as having a configuration in which one starboard side pin hole 40 is provided. However, the present invention is not limited to this, and one or three or more left strut side pin holes are provided in the left strut side joint 28, and one or three or more right strut side pin holes are provided in the right strut side joint 29. It is good also as a structure to provide. The port side joint 31 may be provided with two or more port side pin holes, and the starboard side joint 32 may be provided with two or more starboard side pin holes.

  In the embodiment, the left column 14 is formed by connecting the lower column 15 and the upper column 17, and the right column 19 is formed by connecting the lower column 20 and the upper column 21. Illustrated. However, the present invention is not limited to this, and each of the left column 14 and the right column 19 may be formed by a single rod-shaped body.

  In the embodiment, the small hydraulic excavator 1 provided with the swing type (swing type) front device 4 has been described as an example. However, the present invention is not limited to this, and may be applied to a small hydraulic excavator including an offset type (parallel movement type) front device.

DESCRIPTION OF SYMBOLS 1 Small hydraulic excavator 2 Lower traveling body 3 Upper revolving body 4 Front device 5 Revolving frame 5G Front device bracket 6 Counterweight 6A Outer side surface 6B Left strut support member 6C Right strut support member 6D Upper surface 7 Engine (motor)
8 engine cover 8C hinge member 8D fulcrum 9 driver's seat 10 floor board 11 lever stand 11B left work operation lever 11C right work operation lever 11D travel operation lever 12 exterior cover 13 protection member 14 left column 15, 20 lower column part 15E, 20E bending Part 19 Right strut 23 Anchor member 24 Port member 25 Starboard member 27 Connecting mechanism 28 Left strut side joint 29 Right strut side joint 30 Connecting shaft 30A Left end (left end)
30B Right end (right end)
31 Port side joint 32 Star side joint 33 Angle adjustment mechanism 33A Left angle adjustment mechanism 33B Right angle adjustment mechanism 34 Left column side first pin hole (left column side pin hole)
35 Left strut side second pin hole (left strut side pin hole)
36 Port side pin hole 37 Left engagement pin 38 Right strut side first pin hole (right strut side pin hole)
39 Right strut side second pin hole (right strut side pin hole)
40 starboard side pin hole 41 right engaging pin 42 handle C virtual circle (circumference)

Claims (7)

A self-propelled lower traveling body, an upper revolving body mounted on the lower traveling body so as to be able to swivel, and a front device provided on the front side of the upper revolving body so as to be able to move up and down,
The upper swing body is
A revolving frame provided on the front side with a front device bracket to which a base end of the front device is attached;
A counterweight attached to the rear part of the swivel frame to balance the weight with the front device;
A prime mover provided on the swivel frame located on the front side of the counterweight;
To cover the prime mover from above, a prime mover cover provided to be openable and closable forward and backward with the counterweight position as a fulcrum;
A driver seat provided on the motor cover;
A floor plate that is located on the front side of the motor cover and forms a scaffolding for an operator seated on the driver's seat provided in the swivel frame with a gap in the upper and lower directions between the swivel frame;
A lever stand provided with an operating lever for operating the front device provided in a state of being projected rearward from the floor plate and positioned rearward of the front device bracket of the swivel frame;
An exterior cover provided on the front side of the counterweight and surrounding the outer periphery between the swivel frame and the floor board from the left side, the right side, and the front side;
In a small hydraulic excavator provided with a protective member provided on the rear side of the upper swing body and protecting an operator seated on the driver's seat,
The outer surface of the counterweight is provided with a left column support member and a right column support member spaced apart in the left and right directions,
The protective member is
A left strut comprising a rod-like body extending upward and downward and having a lower end attached to the left strut support member;
A right strut comprising a rod-like body extending upward and downward and having a lower end attached to the right strut support member;
An eaves member that is attached to the upper end of the left strut and the upper end of the right strut via an angle adjustment mechanism and projects above the driver's seat in a state in which the attachment angle with respect to the left strut and the right strut can be adjusted A small hydraulic excavator characterized in that it is configured to include.   2. The small hydraulic excavator according to claim 1, wherein the angle adjusting mechanism is configured such that the mounting angle of the flange member with respect to the left column and the right column can be adjusted in a plurality of stages in the upward and downward directions.   The angle adjustment mechanism includes a left angle adjustment mechanism provided between the left support column and the flange member via a connection shaft so that the angle can be adjusted, and a connection shaft between the right support column and the flange member. The small hydraulic excavator according to claim 1, wherein the hydraulic excavator is configured by a right angle adjusting mechanism provided so that the angle can be adjusted. The connecting shaft is composed of one connecting shaft that connects between the left column and the flange member and between the right column and the flange member,
The flange member is a port member that is located on the left angle adjustment mechanism side and supported by the connecting shaft, and a starboard member that is located on the right angle adjustment mechanism side and supported by the connection shaft. The small hydraulic excavator according to claim 3, comprising a member. A left strut-side joint provided at the upper end of the left strut, a right strut-side joint provided at the upper end of the right strut, and the left strut-side joint and the right strut-side joint are connected to each other. A connecting shaft extending in a direction, a port side joint provided at the left rear end of the flange member and rotatably inserted at the left end of the connection shaft, and a right end of the connection shaft provided at the right rear end of the flange member And a starboard side joint that is rotatably inserted,
The angle adjustment mechanism is
A left strut side pin hole, a right strut side pin hole, which is formed on each of the left strut side joint and the right strut side joint and arranged on the circumference around the connecting shaft;
A port side pin hole, a starboard side pin hole formed on the port side joint and the starboard side joint, respectively, and arranged on the circumference;
The port side joint with respect to the connecting shaft by being inserted between the left column side pin hole and the port side pin hole and between the right column side pin hole and the starboard side pin hole, respectively. A left engagement pin for setting the mounting angle of the starboard side joint, and a right engagement pin;
Of the left and right strut side pin holes and the left and right collar side pin holes, a plurality of one pin holes are arranged on the circumference around the connecting shaft, and the other pin 2. The small hydraulic excavator according to claim 1, wherein one or a plurality of holes are arranged on the circumference around the connecting shaft.   Of the left strut and the right strut, at the boundary portion between the prime mover cover and the driver's seat, bent portions extending upward while being bent away from the driver's seat are provided, respectively. The small hydraulic excavator according to claim 1.   2. The handle according to claim 1, wherein a grip is provided on an upper end side of each of the left and right struts to be gripped when getting on and off the driver's seat at a position below the angle adjusting mechanism. Small hydraulic excavator as described.

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