JP4317100B2 - Excavator - Google Patents

Description

  The present invention relates to a hydraulic excavator including a front device that performs, for example, excavation work of earth and sand.

  Generally, a hydraulic excavator is provided with 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 and rear of the upper revolving body that can be moved up and down. The front apparatus is generally configured. The front device includes a boom, an arm, a bucket, and a boom cylinder, an arm cylinder, and a bucket cylinder that drive these.

  The upper swing body includes an engine as a prime mover, a hydraulic pump driven by the engine, a swing frame equipped with a control valve for supplying pressure oil discharged from the hydraulic pump to each cylinder of the front device, and the like, A foot of the front device for connecting a driver seat on which the operator sits, a building having a cab box or a canopy covering the driver seat, and the control valve and each cylinder of the front device. And a plurality of hydraulic hoses extending through the upper surface of the part.

  Here, the hydraulic excavator includes a small hydraulic excavator called a mini excavator suitable for work in a narrow work site. In this small hydraulic excavator, devices such as an engine, a hydraulic pump, and a control valve are arranged in a space below the building.

  In this case, the building is located on the front side with respect to the swivel frame so that maintenance work such as inspection and maintenance can be performed on equipment such as the engine, hydraulic pump, and control valve disposed below. As a fulcrum, the rear side is attached so as to be tilted (tilted) (see, for example, Patent Document 1).

JP 2000-72048 A

  By the way, since the small hydraulic excavator described above has a low height from the ground to the driver's seat, even when excavation work is performed on a flat ground, stones, concrete fragments, earth and sand, etc. are directed toward the building. Fly away. Therefore, it is conceivable to provide a protective guard for protecting an operator seated in the driver's seat at the front position of the building.

  Here, since the small hydraulic excavator has a small width in the left and right directions, a front device is disposed on the front side of the building. Moreover, when the protective guard is provided in the front position of the building, the protective guard protrudes on the front side of the building.

  Therefore, when the protection guard is provided in the building, if the front device is lifted upward, the boom or the hydraulic hose of the front device may interfere with the protection guard protruding to the front side of the building. For this reason, there is a problem that the front device needs to limit its lifting and lowering the working range of the front device.

  Furthermore, even if the rear side of the building is lifted and tilted up to maintain equipment such as engines, hydraulic pumps, and control valves, the front device and hydraulic hose may interfere with the protective guard. The tilt-up angle must be kept small. As a result, there is a problem that sufficient work space cannot be secured between the turning frame and the building, and workability when maintaining the engine, the hydraulic pump, the control valve, and the like is deteriorated.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to be able to lift the front device upward and to tilt the building greatly even when a protective guard is provided at the front position of the building. It is to provide a hydraulic excavator that can be improved.

  A hydraulic excavator according to a first aspect of the present invention is a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and an up / down direction on a front portion of the upper revolving body. The upper revolving body comprises a revolving frame on which equipment including a prime mover, a hydraulic pump, and a control valve are mounted, and the revolving side has an upper side and a lower side with the front side serving as a fulcrum. Via a top surface near the foot portion of the front device to connect the control valve and the actuator provided in the front device to connect the building having a driver's seat that is mounted so as to tilt in the direction and on which the operator sits. And a hydraulic hose that extends.

Then, in order to solve the above problems, characteristic of the structure of the invention of claim 1 is employed, the in front position of the building is provided with a protective guard for protecting the operator seated in the driver's seat, the protective The guard is provided with a hose relief opening at a position where the hydraulic hose interferes with the protective guard when the front device is lifted upward or the building is tilted up.

  According to a second aspect of the present invention, a swing post that supports the front device so as to be swingable leftward and rightward in front of the building is provided at a front portion of the swing frame, and the hydraulic hose is disposed in front of the swing frame. Forming a slack portion for allowing the front device to move up and down between the upper portion of the swing post and the upper surface of the foot portion and extending from the portion to the upper surface of the foot portion of the front device through the inside of the swing post; The hose relief opening of the protective guard is provided at a position where the slack portion of the hydraulic hose interferes.

  According to a third aspect of the present invention, the protective guard is provided so as to cover substantially half or the entire lower surface of the front surface of the building.

  According to a fourth aspect of the present invention, the protective guard is configured to be detachably provided with an opening closing guard capable of closing the hose escape opening.

  According to the first aspect of the present invention, since the protective guard is provided at the front position of the building, when the protective guard performs excavation work or the like with the front device, for example, stones, concrete fragments, etc. Even when the aircraft flies away, it is possible to protect an operator or the like sitting on the driver's seat from this stone or the like.

  In addition, since the protective guard is provided with a hose relief opening at a position where it interferes with the hydraulic hose, the hydraulic hose can be prevented from interfering with the protective guard when the front device is lifted upward. Thereby, since the front device can be lifted high, the work range of the front device can be widened and workability can be improved.

  Further, even when the building is tilted up, the hydraulic hose can be prevented from interfering with the protective guard by the hose relief opening. As a result, the building can be greatly tilted up, so that a sufficient working space can be secured between the swing frame and the building, and workability when maintaining the prime mover, hydraulic pump, control valve, etc. is improved. can do.

  According to the invention of claim 2, the hydraulic hose is formed with the slack portion between the upper portion of the swing post and the upper surface of the foot portion of the front device in order to allow the front device to move up and down. However, because the hose relief opening of the protective guard is provided at a position where the slack portion of the hydraulic hose interferes, it can prevent damage to the hydraulic hose and protective guard due to interference, improving durability and reliability be able to.

  According to the invention of claim 3, for example, when excavation work is performed with the front device, stones or the like jump and fly toward the building. These stones, etc., jumped from the ground side, and fly toward a low position in the building. Corresponding to this, when the protective guard is provided so as to cover the lower half of the front surface of the building, the operator can be efficiently protected by the small protective guard. Moreover, since there is no protective guard in the upper half of the front of the building, a good front view can be provided to the operator. On the other hand, when the protective guard is provided so as to cover almost the entire front surface of the building, the operator seated in the driver's seat can be reliably protected, and the reliability can be improved.

  According to the invention of claim 4, the hose escape opening can be blocked by the opening closure guard by attaching the opening closure guard to the hose relief opening of the protective guard. Thereby, the operator seated on the driver's seat can be more reliably protected. Further, by removing the opening blocking guard, it is possible to prevent interference with the hydraulic hose by the hose escape opening.

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

  First, FIGS. 1 to 10 show a first embodiment of the present invention. In this Embodiment, it is set as the structure which provides a protective guard so that the lower half of the front surface of the cab box which comprises a building may be covered.

  In FIG. 1, reference numeral 1 denotes a cab specification hydraulic excavator. The hydraulic excavator 1 includes a self-propelled lower crawler traveling body 2, and an upper revolving body 3 rotatably mounted on the lower traveling body 2. A front apparatus 4 provided on the front side of the upper swing body 3 so as to be able to swing and elevate.

  Here, as shown in FIGS. 1 and 2, the front device 4 includes a boom 4A in which a foot portion 4A1 is attached to a swing post 6 described later so that the foot portion 4A1 can be moved up and down, and a front end portion of the boom 4A. An arm 4B that is pivotably attached, a bucket 4C that is pivotally attached to a tip of the arm 4B, a boom cylinder 4D provided between the swing post 6 and the boom 4A, and a boom 4A This is roughly constituted by an arm cylinder 4E provided between the arm 4B and a bucket cylinder 4F provided between the arm 4B and the bucket 4C.

  On the other hand, the boom cylinder 4D, arm cylinder 4E, and bucket cylinder 4F of the front device 4 constitute an actuator, and each cylinder 4D, 4E, 4F is connected to the control valve 14 via a hydraulic hose 22 described later. .

  Further, the upper turning body 3 is formed in a substantially circular shape when viewed from above so that it can turn substantially within the vehicle width of the lower traveling body 2 (see FIG. 4). The upper swing body 3 includes a swing frame 5, a swing post 6, an engine 7, a hydraulic pump 8, a control valve 14, a building 15, a hydraulic hose 22, a protective guard 23, and the like, which will be described later.

  Reference numeral 5 denotes a turning frame constituting a support structure of the upper turning body 3. As shown in FIG. 4, the swivel frame 5 is provided with a flat bottom plate 5A extending in the left and right directions in the front and rear directions, and standing upright on the upper surface side of the bottom plate 5A. A pair of vertical plates 5B, 5B, a cylindrical support bracket 5C provided at the front end of each vertical plate 5B, and a rear side of the support bracket 5C. The front beam 5D extending in the left and right directions so as to be orthogonal to each other, the middle beam 5E extending in the left and right directions at the rear position of each vertical plate 5B, and the space between the front beam 5D and the middle beam 5E are covered. Thus, it is generally constituted by an under cover 5F laid on the left side of the bottom plate 5A. Further, the support bracket 5C is disposed so as to protrude forward of a cab box 20 constituting a building 15 described later.

  6 is a swing post attached to the support bracket 5C of the revolving frame 5. The swing post 6 is connected to the support bracket 5C via a connecting pin (not shown). It can swing rightward. Further, the swing post 6 is disposed at a front position of the cab box 20 constituting the building 15. The boom 4A of the front device 4 is attached to the swing post 6 so as to be able to move up and down, and the front device 4 can be swung left and right by extending and retracting a swing cylinder (not shown). . Moreover, the inside of the swing post 6 is hollow, and the hydraulic hose 22 is inserted from the side to the upper side.

  Reference numeral 7 denotes an engine as a prime mover mounted on the rear side of the turning frame 5, and the engine 7 is arranged in a horizontally placed state extending in the left and right directions. A hydraulic pump 8 driven by the engine 7 is provided on the left side of the engine 7, and a radiator 9 and an oil cooler 10 are disposed on the right side of the engine 7.

  Further, 11 is a hydraulic oil tank located on the front side of the radiator 9 and provided on the right side of the revolving frame 5, and 12 is a fuel tank provided on the front side of the hydraulic oil tank 11. Reference numeral 13 denotes a battery disposed on the fuel tank 12.

  A control valve 14 is located on the left front side of the revolving frame 5 and is disposed on the under cover 5F. The control valve 14 is formed by connecting a plurality of hydraulic pilot spool valves. That is, the control valve 14 includes a boom control valve that controls the boom cylinder 4D of the front device 4, an arm control valve that controls the arm cylinder 4E, a bucket control valve that controls the bucket cylinder 4F, a swing control valve that controls the swing cylinder, It is generally configured by other actuator control valves and the like. And the control valve 14 is connected to each cylinder 4D, 4E, 4F etc. of the front apparatus 4 via the below-mentioned hydraulic hose 22 grade | etc.,.

  Next, reference numeral 15 denotes a building provided on the revolving frame 5, and the building 15 is configured as a cab specification building including a cab box 20 that covers a periphery and an upper side of a driver seat 17 described later. In addition, the building 15 is mounted so that the front side can be rotated upward and downward on the front side of the revolving frame 5, thereby tilting the rear side up and down with the front side as a fulcrum (tilt) Up and tilt down). And the building 15 is roughly comprised by the below-mentioned floor board member 16, the driver's seat 17, the cab box 20, etc.

  Reference numeral 16 denotes a floor board member (illustrated in FIG. 3) constituting the bottom of the building 15. The floor board member 16 is a floor board (not shown) whose front side serves as a footrest for the operator, and the rear side of the floor board is stepped. The driver's seat pedestal 16A is raised. Further, a control valve 14 is disposed below the floor plate constituting the floor plate member 16, and an engine 7, a hydraulic pump 8, and the like are disposed below the driver seat base 16A. The floor plate member 16 is attached to the front beam 5D of the revolving frame 5 so that the front side of the floor plate member 16 can be pivoted upward, downward, frontward, and rearward, and the rear side is provided with a support member provided so as to straddle the engine 7 ( (Not shown) is detachably attached.

  Reference numeral 17 denotes a driver seat provided on the driver seat base 16A of the floor plate member 16, and the driver seat 17 is seated by an operator. Further, work levers 18 and 18 for operating the front device 4 and the like are disposed on both the left and right sides of the driver's seat 17. Further, on the front side of the driver's seat 17, a traveling lever / pedal 19 that is located on the floor plate of the floor plate member 16 and that travels the lower traveling body 2 is disposed.

  Reference numeral 20 denotes a cab box that forms the outer shape of the building 15. The cab box 20 is provided on the floor plate member 16 and is formed as a hollow structure that covers the periphery and the upper side of the driver's seat 17. The cab box 20 includes, as shown in FIGS. 1, 3, 5, and the like, a front surface portion 20 </ b> A formed as a vertically long rectangular frame positioned on the front side, and a rear surface portion 20 </ b> B positioned on the rear side. The left side surface portion 20C positioned on the left side, the right side surface portion 20D positioned on the right side, and the ceiling surface portion 20E closing the upper side are formed in a box shape. Further, a door 20F is attached to the left side surface portion 20C so as to be openable and closable, being positioned closer to the front side.

  A front glass 20G is attached to the front surface portion 20A, and a ceiling glass 20H is attached to the front side of the ceiling surface portion 20E. On the other hand, on the left side of the front glass 20G, a wiper device 21 is attached, which is located at an approximately middle portion in the upper and lower directions and wipes off water droplets and dirt adhering to the front glass 20G.

  Furthermore, as shown in FIG. 5, a total of four screw seats 20J, two each on the left and right sides, are provided on the front surface portion 20A of the cab box 20. Of the four screw seats 20J provided on the front surface portion 20A, the two screw seats 20J located on the left side correspond to the two brackets 26 provided on the left side of the protective guard 23 described later. They are arranged at large intervals in the upper and lower directions. On the other hand, the two screw seats 20 </ b> J located on the right side are arranged at a small interval in the upward and downward directions corresponding to the two brackets 26 provided on the right side of the protective guard 23.

  Here, since the small hydraulic excavator 1 is formed with a small width in the left and right directions, the cab box 20 disposed on the left side is a front device 4 provided at a substantially central portion in the left and right directions. It extends to the right side beyond (swing post 6). Therefore, since the cab box 20 exists behind the front device 4, the front device 4 lifts the boom 4A upward until it approaches the front surface portion 20A of the cab box 20, that is, FIG. 7 and the position shown in FIG. 8 will be in the state which raised boom 4A most.

  On the other hand, when the building 15 is tilted up to maintain the engine 7, the hydraulic pump 8, the control valve 14, etc., the building 15 moves the front portion 20A of the cab box 20 to the foot portion 4A1 of the boom 4A or the swing post 6. 9, the position shown in FIGS. 9 and 10 is the most tilted up state.

  Reference numeral 22 denotes a plurality of hydraulic hoses that connect the control valve 14 and the cylinders 4D, 4E, 4F provided in the front device 4. These hydraulic hoses 22 connect the boom control valve, arm control valve, and bucket control valve of the control valve 14 to the boom cylinder 4D, arm cylinder 4E, and bucket cylinder 4F of the front device 4. Each hydraulic hose 22 protrudes from the front portion of the swing frame 5 and enters the swing post 6 from the left side, as shown in FIGS. Further, each hydraulic hose 22 that has entered the swing post 6 protrudes from the upper rear side of the swing post 6 while curving in an S-shape, and is bent so as to wrap around the foot portion 4A1 of the boom 4A from the rear side. It extends along the boom 4A via the upper surface 4A2 in the vicinity of the foot portion 4A1.

  Here, each hydraulic hose 22 forms a slack portion 22A between the upper rear side of the swing post 6 and the upper surface 4A2 in the vicinity of the foot portion 4A1 of the boom 4A. The slack portion 22A is for allowing the front device 4 (boom 4A) to move up and down relative to the swing post 6, and is curved so as to swell rearward or upward around the foot portion 4A1 of the boom 4A.

  Next, reference numeral 23 denotes a protective guard provided on the front portion 20A of the cab box 20 constituting the building 15, and the protective guard 23 covers the front glass 20G of the cab box 20 so as to sit on the driver's seat 17. Is to protect. Further, the protective guard 23 is provided so as to cover almost half of the front portion 20 </ b> A of the cab box 20 which is lower than the wiper device 21.

  Here, since the small hydraulic excavator 1 has a low height from the ground to the building 15 (driver's seat 17), for example, even when excavation work is performed on a flat ground, stones, concrete fragments, earth and sand Etc. fly toward the building 15. However, among the stones that fly toward the building 15, most of the relatively large stones or the like fly toward the lower side of the building 15, and are therefore lower than the front portion 20 </ b> A of the cab box 20. The protective guard 23 provided so as to cover almost half of the side can protect the front portion 20A (operator) of the cab box 20 from stones or the like.

  As shown in FIG. 6, the protective guard 23 includes a frame body 24 having a surrounding frame structure, a protective net 25 whose periphery is fixed to the frame body 24 so as to close the inside of the frame body 24, The frame 24 is composed of two brackets 26 provided on both the left and right sides. The frame 24 constituting the protective guard 23 has a substantially rectangular shape elongated in the left and right directions. However, the frame body 24 is a bent portion 24A whose lower right portion is bent in an L shape toward the inside, and a hose escape opening 27 described later is formed by the bent portion 24A.

  The protective net 25 is formed by arranging a wire rod having a strength that does not cut when a stone or the like collides, in a lattice shape. The protective net 25 may be formed of a net-like steel plate having a large number of holes, for example.

  Further, out of the four brackets 26, the two brackets 26 located on the left side opposite to the hose escape opening 27 are arranged at large intervals in the upper and lower directions, and are located on the right side which is the hose escape opening 27 side. The two brackets 26 are arranged at a small interval in the upward and downward directions corresponding to the provision of the hose relief opening 27.

  Reference numeral 27 denotes a hose relief opening provided in the protective guard 23. The hose relief opening 27 is located at a position where the slack portion 22A of each hydraulic hose 22 interferes with the protective guard 23 when the boom 4A of the front device 4 is lifted upward or when the building 15 is tilted up, that is, The swing post 6 is formed at the lower right portion of the protective guard 23 on the rear side of the boom 4A.

  Further, the hose relief opening 27 is opened in a substantially rectangular shape by the bent portion 24A of the frame body 24, and the opening size thereof is a hydraulic hose even when the swing post 6 is swung at the position where the boom 4A is most lifted. The size is set such that the 22 slack portions 22A do not interfere with each other. That is, the hose escape opening 27 may be large enough to escape the slack portion 22A of the hydraulic hose 22, and is formed with a small opening area. Thereby, the hose escape opening 27 having a small opening area can prevent a stone or the like from colliding with the front surface portion 20 </ b> A of the cab box 20.

  Here, when the protective guard 23 is attached to the front portion 20A of the cab box 20, the protective guard 23 protrudes to the front side. However, as shown in FIG. 7, when the boom 4 </ b> A of the front device 4 is lifted up most as shown in FIG. 7, the hose escape opening 27 is formed so that the slack portion 22 </ b> A of the hydraulic hose 22 becomes the protective guard 23. Interference can be prevented. Further, as shown in FIG. 9, the hose relief opening 27 interferes with the protective guard 23 by the slack portion 22A of the hydraulic hose 22 as shown in FIG. Can be prevented.

  As shown in FIG. 5, the protective guard 23 having the hose escape opening 27 configured in this manner screws the bolts 28 inserted through the brackets 26 onto the screw seats 20 </ b> J provided on the front surface portion 20 </ b> A of the cab box 20. By this, it can attach to the position which covers substantially the lower half of 20 A of front parts. Further, when the protective guard 23 is damaged, it can be easily replaced by loosening each bolt 28.

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

  First, the operator can travel the lower traveling body 2 by sitting on the driver's seat 17 and operating the traveling lever / pedal 19. Further, by operating the left and right work levers 18, the boom 4 </ b> A, the arm 4 </ b> B, and the bucket 4 </ b> C of the front device 4 can be operated to perform soil excavation work and the like.

  Here, when performing excavation work or the like of earth and sand by the front device 4, stones and the like are scattered, and a part of them is flying toward the building 15. However, since the building 15 is provided with the protective guard 23 so as to cover the lower side of the front portion 20A of the cab box 20, it is possible to prevent the front glass 20G from being damaged by flying stones and the like. The seated operator can be protected.

  When the boom 4A of the front device 4 is lifted high, as shown in FIG. 7, a hydraulic hose protrudes rearward or upward from the foot 4A1 of the boom 4A to the protective guard 23 protruding to the front side of the cab box 20. 22 slack parts 22A approach. However, since the hose escape opening 27 is provided in the protective guard 23 at a position where the slack portion 22A of the hydraulic hose 22 interferes, the hydraulic hose 22 can be prevented from contacting the protective guard 23 as shown in FIG. . Thereby, the front apparatus 4 can be operated largely and work can be performed.

  On the other hand, when inspecting and servicing equipment such as the engine 7, the hydraulic pump 8, and the control valve 14 disposed under the building 15, as shown in FIG. Tilt up the rear side from the upper side to the front side as a fulcrum. At this time, the protective guard 23 and the slack portion 22A of the hydraulic hose 22 approach each other as when the boom 4A of the front device 4 is lifted high. However, since the hose relief opening 27 is provided in the protective guard 23 at a position where the slack portion 22A of the hydraulic hose 22 interferes, the hydraulic hose 22 can be prevented from contacting the protective guard 23 as shown in FIG. . As a result, the building 15 can be largely tilted up, so that a large work space can be provided between the revolving frame 5 and the building 15, and the maintenance work for the hydraulic pump 8, the control valve 14, etc. can be performed efficiently. Can do.

  Thus, according to the first embodiment, since the protective guard 23 is provided on the front surface portion 20A of the cab box 20 constituting the building 15, the protective guard 23 is a stone flying toward the building 15. Further, it is possible to prevent the front glass 20G of the cab box 20 from being damaged by concrete fragments or the like, and to protect the operator seated on the driver's seat 17.

  Moreover, since the hose relief opening 27 is provided in the protective guard 23 at a position where it interferes with the slack portion 22A of the hydraulic hose 22, the slack portion of the hydraulic hose 22 is raised when the boom 4A of the front device 4 is lifted upward. It is possible to prevent 22A from interfering with the protective guard 23. As a result, since the front device 4 can be lifted high, the work range of the front device 4 can be widened to improve workability. Moreover, damage to the hydraulic hose 22 and the protective guard 23 due to interference can be prevented in advance, and durability and reliability can be improved.

  In addition, when the building 15 is tilted up to perform maintenance work on equipment such as the engine 7, the hydraulic pump 8, and the control valve 14, the hose relief opening 27 has the slack portion 22 </ b> A of the hydraulic hose 22 as the protective guard 23. Interference can be prevented. As a result, the building 15 can be largely tilted up, so that a sufficient working space can be secured between the turning frame 5 and the building 15, and the engine 7, the hydraulic pump 8, the control valve 14, etc. are maintained. Workability at the time can be improved.

  On the other hand, since the protective guard 23 is provided so as to cover almost the lower half of the front portion 20A of the cab box 20, the front glass 20G can be protected from a large stone or the like flying low. Can be improved efficiently. Moreover, since the upper half of the front surface portion 20A of the cab box 20 does not have the protective guard 23, it is possible to provide a good front view to the operator and improve workability.

  Furthermore, since the protection guard 23 is configured to be attached to the front portion 20A of the cab box 20 using the bolts 28, it can be easily attached to the existing hydraulic excavator 1. Further, when the protective guard 23 is damaged, it can be easily replaced by loosening each bolt 28.

  Next, FIG. 11 shows a second embodiment of the present invention. The feature of this embodiment is that the protective guard is provided with an opening closing guard that can close the hose escape opening in a detachable manner. In the second embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  In FIG. 11, reference numeral 31 denotes an opening closing guard that is detachably provided so as to close the hose escape opening 27 of the protective guard 23. This opening blockage guard 31 covers the front glass 20G of the cab box 20 exposed at the position of the hose escape opening 27 when the work is performed without raising the front device 4 upward and when the building 15 is not tilted up. Is.

  The opening block guard 31 includes a frame 32, a protective net 33, and a bracket 34, and is bolted to the front portion 20A of the cab box 20 via the bracket 34, in the same manner as the protective guard 23. Thereby, the opening obstruction | occlusion guard 31 can be easily removed when tilting up the building 15 when working by raising the front device 4 high upward.

  In the second embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment described above. In particular, according to the second embodiment, the hose escape opening 27 of the protective guard 23 can be closed by the opening closure guard 31, so that stone or the like passes through the hose escape opening 27 and the front glass 20G of the cab box 20. Can be prevented, and the operator seated on the driver's seat 17 can be more reliably protected.

  On the other hand, when the opening blocking guard 31 is removed, the hose escape opening 27 of the protective guard 23 can be opened. As a result, the slack portion 22A of the hydraulic hose 22 can be prevented from interfering with the protective guard 23 when the boom 4A of the front device 4 is lifted upward. Can be improved. Further, even when the building 15 is tilted up, the slack portion 22A of the hydraulic hose 22 can be prevented from interfering with the protective guard 23, so that a sufficient working space is secured between the revolving frame 5 and the building 15, The workability of the maintenance work can be improved.

  In each embodiment, the case where the protective guard 23 is provided so as to cover substantially the lower half of the front surface portion 20A of the cab box 20 has been described as an example. However, the present invention is not limited to this. For example, a protective guard 41 according to the first modification shown in FIG. 12 may be provided so as to substantially cover the front surface with respect to the front surface portion 20A of the cab box 20. This protective guard 41 is constituted by a frame body 42, a protective net 43, and a bracket 44 in substantially the same manner as the protective guard 23 according to the first embodiment, and a hose escape opening 45 is provided at a lower right position thereof. .

  Moreover, in each embodiment, the cab specification hydraulic excavator 1 provided with the building 15 which has the cab box 20 which covers the circumference | surroundings and upper direction of the driver's seat 17 is illustrated, and the protective guard 23 is provided in the front part 20A of the cab box 20. It was described as an attachment. However, the present invention is not limited to this, and for example, a protective guard 23 may be provided on a canopy-type hydraulic excavator 51 as in a second modification shown in FIG. That is, by attaching the protective guard 23 to the left and right front pillars 54 and 55 located on the front surface of the canopy 53 constituting the building 52, it is possible to obtain substantially the same operational effects as those of the above-described embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a left side view showing a cab specification hydraulic excavator applied to a first embodiment of the present invention. It is a perspective view of the hydraulic shovel shown in FIG. It is a front view of a hydraulic excavator shown in a state where a front device and a swing post are omitted. It is a top view which shows the upper turning body of the state which abbreviate | omitted the building. It is a disassembled perspective view shown in the state which decomposed | disassembled the building and the protection guard. It is an expansion perspective view which shows a protection guard alone. It is a left side view of a hydraulic excavator shown in a state where the front device is most elevated. It is a principal part expansion perspective view which shows the relationship between the slack part of a hydraulic hose when a front apparatus is lifted highest, and the hose escape opening of a protective guard. It is a left view of the hydraulic excavator shown in a state where the building is largely tilted up. It is a principal part expansion perspective view which shows the relationship between the slack part of a hydraulic hose when the building is greatly tilted up, and the hose escape opening of a protective guard. It is a perspective view which shows the opening obstruction | occlusion guard by the 2nd Embodiment of this invention with a protection guard. It is a front view which shows the hydraulic shovel provided with the protection guard by the 1st modification of this invention. It is a front view which shows the hydraulic shovel of the canopy specification applied to the 2nd modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,51 Hydraulic excavator 2 Lower traveling body 3 Upper turning body 4 Front device 4A Boom 4B Arm 4C Bucket 4D Boom cylinder (actuator)
4E Arm cylinder (actuator)
4F Bucket cylinder (actuator)
5 Swing frame 6 Swing post 7 Engine (motor)
8 Hydraulic pump 14 Control valve 15, 52 Building 17 Driver's seat 20 Cab box 20A Front part 22 Hydraulic hose 22A Slack part 23, 41 Protection guard 27, 45 Hose escape opening 31 Opening closure guard 53 Canopy

Claims (4)

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 on the front portion of the upper revolving body so as to be able to move up and down. Become
The upper swing body is mounted with equipment including a prime mover, a hydraulic pump, and a control valve. The upper swing body is attached to the swing frame so that the rear side tilts upward and downward with the front side as a fulcrum, and an operator is seated. In a hydraulic excavator comprising a building having a driver's seat and a hydraulic hose extending through an upper surface near the foot portion of the front device to connect the control valve and an actuator provided in the front device,
Wherein the front position of the building is provided with a protective guard for protecting the operator seated in the driver's seat,
The protective guard is characterized in that a hose relief opening is provided at a position where the hydraulic hose interferes with the protective guard when the front device is lifted upward or the building is tilted up. Hydraulic excavator.   A swing post is provided at the front of the swivel frame to support the front device so that it can swing left and right in front of the building, and the hydraulic hose extends from the front of the swivel frame to the inside of the swing post. A slack portion for allowing the front device to move up and down is formed between the upper portion of the swing post and the upper surface of the foot portion, and extends to the upper surface of the foot portion of the front device. The hydraulic excavator according to claim 1, wherein the excavator is provided at a position where a slack portion of the hydraulic hose interferes.   The hydraulic excavator according to claim 1 or 2, wherein the protective guard is provided so as to cover substantially half or the entire lower surface of the front surface of the building.   The hydraulic excavator according to claim 1, 2 or 3, wherein the protective guard is configured to be detachably provided with an opening closing guard capable of closing the hose escape opening.

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