JP2011026771A - Piping mounting structure of construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piping mounting structure of construction machinery, which can enhance safety by preventing breakage of a relief valve, and which can achieve the miniaturization of the construction machinery and an increase in economical efficiency. <P>SOLUTION: The construction machinery includes: a revolving frame 16 which comprises a bottom plate and a pair of vertical plates erected at a required spacing on the bottom plate; a working machine which is arranged between the pair of vertical plates; a hydraulic cylinder for driving the working machine; a hydraulic hose 28 for transporting oil pressure to the hydraulic cylinder; the relief valve 29 which has a valve operation rod 29a protruded outward; and a cabin which is mounted on the bottom plate in such a manner as to be juxtaposed with the vertical plate 29b. In the construction machinery, the relief valve 29 is mounted on the vertical plate 27b on the side adjacent to the cabin in such a manner as to be integrated with the hydraulic hose 28. In the piping mounting structure of the construction machinery, the relief valve 29 is mounted downward on the vertical plate 27b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a piping mounting structure for construction machines, and in particular, a piping mounting structure for construction machines in which a relief valve provided on a swing frame in a construction machine such as a hydraulic excavator can be protected from falling objects. It is about.

  2. Description of the Related Art Conventionally, a hydraulic excavator as a construction machine has an upper swing body mounted on a lower traveling body via a swing mechanism (swivel wheel) so as to be rotatable. A work machine including a boom or the like is attached to the front center portion of the revolving frame in the upper revolving structure so as to be able to move up and down. In addition, a cabin or the like is provided on one front side of the upper swing body, and a storage box or a tank for storing tools is provided on the other front side.

  As a turning frame in such a conventional hydraulic excavator, for example, there is one as shown in Patent Document 1. 7 and 8 show an example of a conventional turning frame. In the figure, the swivel frame 51 has a bottom plate 52 and a pair of left and right vertical plates 53a and 53b which are erected on the bottom plate 52 at a required interval. A work machine 55 including a boom 54 extending in the front-rear direction is attached between the pair of vertical plates 53a and 53b so as to be able to move up and down, and a cabin 56 is disposed outside the vertical plate 53b.

  The pair of vertical plates 53a and 53b are erected substantially perpendicularly from the bottom plate 52, respectively. A relief valve 57 and a hydraulic hose 58 are attached to the upper inner surface of the vertical plate 53 b adjacent to the cabin 56 via a bracket 60.

  The hydraulic hose 58 is a hose that transports hydraulic pressure to a hydraulic cylinder (not shown) that drives the working machine 55, an attachment hose for options, or the like. The hydraulic hose 58 is connected to a control valve 59 disposed on the bottom plate 52 and the hydraulic cylinder.

  On the other hand, the relief valve 57 is a valve that limits the maximum pressure in the hydraulic hose 58. The relief valve 57 is disposed in the middle of the hydraulic hose 58. The relief valve 57 is provided with a control valve operating rod 57a that can be moved and switched in the vertical direction so as to protrude upward. The valve switching operation is operated by a manual method or an automatic method by electric or hydraulic pressure.

  In this conventional structure of the revolving frame 51, in order to maintain the clearance between the hydraulic hose 58 and the cabin 56 and the clearance between the hydraulic hose 58 and the work implement 55, as shown in FIG. Clearances S3 and S4 are provided between the working machine 55 and the hydraulic hose 58, respectively.

Japanese Patent Application Laid-Open No. 2007-51413.

  As described above, in the structure of the swivel frame in the conventional construction machine, the relief valve 57 is disposed on the upper inner surface of the vertical plate 53b on one side adjacent to the cabin 56, and the relief valve 57 is disposed above the relief valve 57 via the bracket 57. It is arranged in a protruding state. For this reason, for example, when an object falls from above the relief valve 57, or when an operator puts his hand on the relief valve 57, there is a problem that it is damaged.

  Further, clearances that eliminate interference between the hydraulic hose 58 and the cabin 56 and interference between the hydraulic hose 58 and the work machine 55 are respectively defined between the vertical plate 53b and the cabin 56, and between the vertical plate 53b and the work machine 55. Since the gaps S3 and S4 are provided, there is a waste of space, and it is necessary to increase the shape of the bottom plate 52 and the like in the revolving frame 51. For this reason, there existed a problem that economical waste and a construction machine enlarged.

  Therefore, there is a technical problem to be solved in order to improve the safety by eliminating breakage of the relief valve, and to make it possible to reduce the size of the construction machine and improve the economy. The present invention aims to solve this problem.

  The present invention has been proposed in order to achieve the above-mentioned object, and the invention according to claim 1 is a revolving frame having a bottom plate and a pair of vertical plates erected on the bottom plate at a required interval. A working machine disposed between the pair of vertical plates so as to be movable up and down, a hydraulic cylinder for driving the working machine, a hydraulic hose for transporting hydraulic pressure to the hydraulic cylinder, and projecting outward A relief valve having a valve operating rod, and a cabin or tank mounted on the bottom plate in juxtaposition with the vertical plate, and the vertical plate on the side adjacent to the cabin or tank In a construction machine pipe mounting structure in which the relief valve is mounted integrally with the hydraulic hose, a construction machine pipe mounting structure is provided in which the relief valve is disposed on the vertical plate and the valve operating rod is directed downward. To.

  According to this configuration, since the relief valve is arranged on the vertical plate facing downward, even if an object falls from above the relief valve and the fallen object hits the relief valve, the fallen object remains There is no direct hit. In addition, it is possible to prevent the worker from putting his hand on the relief valve and damaging the relief valve.

  According to a second aspect of the present invention, in the pipe mounting structure for a construction machine according to the first aspect, the relief valve is disposed on the vertical plate with the tip of the relief valve inclined to the inside of the pair of vertical plates. Provided a pipe mounting structure for a construction machine.

  According to this configuration, the tip of the relief valve is separated from the cabin or tank, and a large clearance between the tip of the relief valve and the cabin or tank can be secured. Further, by providing the relief valve at an angle, the thickness of the relief valve in the left-right direction can be absorbed by a portion such as a clearance, and the relief valve can be arranged in a small space.

  According to a third aspect of the present invention, in the pipe mounting structure for a construction machine according to the first or second aspect, the vertical plate has a lower end side parallel to the vertical plate and an upper end side facing the cabin or tank side. A pipe mounting structure for a construction machine is provided, in which a plate-like bracket that is inclined in an inclined manner is provided, and the relief valve is disposed integrally with the hydraulic hose at the upper end of the bracket.

  According to this configuration, the leaf valve and the hydraulic hose can be integrally attached to the vertical plate via the bracket.

  According to a fourth aspect of the present invention, there is provided the construction machine pipe mounting structure according to the first, second or third aspect, wherein the hydraulic hose is arranged outside the region between the pair of vertical plates. provide.

  According to this configuration, by disposing the hydraulic hose outside the region between the pair of vertical plates, interference of the hydraulic hose with the work machine can be avoided.

  In the invention according to claim 1, even if an object falls from above the relief valve and hits it, the falling object does not damage the relief valve, and an operator puts his hand on the relief valve, It is possible to prevent the relief valve from being damaged. Thereby, damage can be eliminated and improvement in safety can be expected.

  According to the second aspect of the present invention, since the clearance between the tip of the relief valve and the cabin or tank can be ensured, interference with the cabin or tank of the relief valve can be reliably avoided. As a result, the pressure of the valve can be adjusted smoothly, and in addition to the effect of the first aspect of the invention, an improvement in operability can be expected. Further, since the relief valve can be disposed in a small space by absorbing the thickness of the relief valve in the left-right direction at the clearance with the cabin or tank, the shape of the bottom plate of the swivel frame can be reduced. . As a result, it is possible to reduce the size of the construction machine and to improve the economy.

  According to the third aspect of the present invention, the leaf valve and the hydraulic hose can be integrally attached via the bracket. Therefore, in addition to the effects of the first or second aspect, the structure is simplified and the assembly workability is improved. Can be expected.

  Since the invention according to claim 4 can avoid the interference between the working machine and the hydraulic hose, in addition to the effect of the invention according to claim 1, 2 or 3, further improvement in safety can be expected.

1 is a side view showing an overall structure of a hydraulic excavator to which an embodiment of the present invention is applied. The perspective view of the turning frame applied to the hydraulic excavator same as the above. The top view of the turning frame applied to the hydraulic excavator same as the above. The partial expanded side view which shows the principal part structure concerning the piping mounting structure of a hydraulic excavator same as the above. The top view which shows the principal part structure concerning a piping attachment structure same as the above seeing from the arrow A direction of FIG. The partial expanded side view shown seeing from the BB arrow direction of FIG. The partial expanded side view which shows the principal part structure concerning the piping mounting structure of the conventional hydraulic shovel. The top view which shows the principal part structure concerning the conventional piping attachment structure seeing from the arrow C direction of FIG.

  In order to achieve the purpose of preventing breakage of the relief valve and improving safety, as well as reducing the size of the construction machine and improving the economy, the present invention is provided with a required interval on the bottom plate and the bottom plate. A revolving frame having a pair of vertical plates, a working machine disposed between the pair of vertical plates so as to be movable up and down, a hydraulic cylinder for driving the working machine, and the hydraulic cylinder A hydraulic hose for transporting hydraulic pressure, a relief valve having a valve operating rod projecting outward, and a cabin or tank mounted on the bottom plate in parallel with the vertical plate, and the cabin Alternatively, in a construction machine pipe mounting structure in which the relief valve is mounted integrally with the hydraulic hose on the vertical plate adjacent to the tank, the relief valve is arranged on the vertical plate facing downward. It was realized by the.

  Hereinafter, a preferred embodiment of a pipe mounting structure for a construction machine according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a side view showing the overall structure of a hydraulic excavator to which an embodiment of the present invention is applied. In the following description, the left and right direction left side of FIG. 1 is assumed to be the front, the right side is the rear side, the up and down direction is the up and down direction, and the direction perpendicular to the page is the left and right.

  In FIG. 1, a hydraulic excavator 11 includes a lower traveling body 13 provided with left and right crawlers 12L and 12R (only 12L is shown in FIG. 1) as traveling means, and a swivel wheel above the lower traveling body 13. 14, an upper revolving unit 15 provided so as to be able to swivel through 14, a work machine 17 provided at a front center portion on a revolving frame 16 that forms a basic lower structure of the upper revolving unit 15, and a front of the revolving frame 16. A cabin 18 provided on one side and an upper cover 19 that covers most of the working machine 17 and the cabin 18 on the revolving frame 16 are provided. Although not shown, the upper cover 19 houses equipment such as an engine, a hydraulic pump driven by the engine, and a hydraulic oil tank serving as a hydraulic source of the hydraulic pump.

  The work implement 17 includes a boom 20, an arm 21 that is rotatably connected to the boom 20, and a bucket 22 that is rotatably connected to the arm 21. The boom 20, the arm 21, and the bucket 22 are operated by a boom hydraulic cylinder 23, an arm hydraulic cylinder 24, and a bucket hydraulic cylinder 25, respectively.

  The revolving frame 16 has a bottom plate 26 as shown in FIGS. On the upper surface of the bottom plate 26, a pair of left and right vertical plates 27a and 27b, which serve as boom mounting brackets extending in the front-rear direction, are erected at a required distance from the front center portion. And the one end (base end) side of the boom 20 in the said working machine 17 is attached to the upper part of the front end side of these right and left vertical plates 27a and 27b so as to be able to move up and down, and outside the vertical plate 27b (front one side). The cabin 18 is arranged on the side.

  The boom hydraulic cylinder 23, the arm hydraulic cylinder 24, and the bucket hydraulic cylinder 25 are provided with hydraulic pressure on the upper surface of the bottom plate 26 and on the rear side of the pair of vertical plates 27a and 27b. A control valve 30 for controlling the flow of pressure oil supplied through the hose 28 and the relief valve 29 is provided.

  The relief valve 29 is a valve that limits the maximum pressure in the hydraulic hose 28, and is disposed in the middle of the hydraulic hose 28. Further, the relief valve 29 is provided so as to protrude greatly outward from the block 28a, and the pressure adjustment operation can be performed by a manual method or an automatic method by electric or hydraulic pressure.

  The relief valve 29 is attached to one vertical plate 27b of the pair of vertical plates 27a and 27b via a plate-like bracket 31. On the other hand, the hydraulic hose 28 is provided along one side of the boom 20 and the one side of the cabin 18 of the work machine 17 and holds the clearance with the boom 20 and the clearance with the cabin 56 in the work machine 17. The gaps S1 and S2 are provided between the boom 20 and the cabin 56, respectively. The gap S1 and the gap S2 are appropriately set according to the required clearance.

  The bracket 31 is a metal plate having an upper end 31a and a lower end 31b integrally. As shown in FIG. 6, the bracket 31 is formed such that the upper end portion 31a is inclined outward (vertical plate 27b side) with respect to the lower end portion 31b, and is bent in a substantially reverse letter shape. The bracket 31 has the upper end 31a protruding upward from the upper end of the vertical plate 27b, the lower end 31b is disposed in parallel with the inner surface of the vertical plate 27b, and the lower end 31b and the vertical plate 27b. Is fixed to the vertical plate 27b.

  As a result, the bracket 31 has the upper end portion 31a inclined in the left-right direction by an angle θ1 so that the upper end side of the upper end portion 31a approaches the cabin 18 and the lower end side approaches the center of the pair of vertical plates 27a and 27b. Is provided. Then, as shown in FIG. 6, the protruding tip of the relief valve 29 faces downward on the surface facing the upper side of the upper end portion 31a, and the entire relief valve 29 is inclined to the front by an angle θ2. A relief valve 29 is attached. Further, in this mounted state, the thickness of the control valve 30 is absorbed by the thickness of the vertical plate 27b, the clearance S1 of the cabin 56, and the clearance S2 of the boom 20 because the control valve 30 is inclined by the angle θ1 in the left-right direction. . The relief valve 29 as a whole is inclined to the front side by an angle θ2 so that it escapes to the rear side of the bracket 31, protrudes downward on the rear side of the bracket 31 as shown in FIG. 4, and interferes with the bracket 31. Avoid.

  Therefore, according to the excavator 11 having the configuration of this embodiment, the relief valve 29 is attached to the vertical plate 27b with the protruding tip facing downward, so that an object falls from above the relief valve 29 and the fall Even if an object hits the leaf valve 29, the falling object does not damage the relief valve 29. Further, it is possible to prevent the worker from putting his hand on the relief valve 29 and damaging the relief valve.

  In addition, the relief valve 29 is attached to the upper end portion 31a side of the bracket 31 that is inclined in the left-right direction toward the cabin side, and is arranged at an angle θ1 so that the distal end portion of the relief valve 29 is separated from the cabin 18, The clearance between the tip of the relief valve 29 and the cabin 18 is secured to a large extent, and the entire relief valve 29 is inclined forward by an angle θ2 to avoid interference with the bracket 31 of the relief valve 29, so that the operation is smooth. It can be carried out.

  Furthermore, since the relief valve 29 is provided to be inclined in the left-right direction, the thickness of the relief valve 29 can be absorbed by the thickness of the vertical plate 27b and the gaps (clearance portions) S1 and S2. As a result, the relief valve 29 can be arranged in a small space, and the shape of the bottom plate 26 and the like of the revolving frame 15 can be reduced to reduce the size of the construction machine. At the same time, the hydraulic hose 28 is disposed outside the region between the pair of vertical plates 27a, 27b due to the inclination of the relief valve 29 in the left-right direction. Interference between the boom 20 of the working machine 17 that moves up and down and the hydraulic hose 28 can be avoided.

  Further, by attaching the relief valve 29 to the vertical plate 27b via the bracket 31, the assembling work can be easily performed.

  In the above embodiment, the structure provided on the side of the vertical plate 27b adjacent to the cabin 18 has been disclosed. However, the relief valve 29 and the hydraulic hose 28 are provided on the side of the vertical plate 27a adjacent to the tank. In the case of a different structure, it can be applied in the same manner. Further, the structure in which the relief valve 29 and the hydraulic hose 28 are attached to the vertical plate 27b via the bracket 31 has been disclosed and described, but the vertical plate 27b corresponds to the upper end portion 31a of the bracket 31 without using the bracket 31. An inclined surface may be provided, and the relief valve 29 and the hydraulic hose 28 may be directly fixed to the inclined surface.

  Furthermore, the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

  In the above-described embodiment, the case where the present invention is applied to a hydraulic excavator has been described.

DESCRIPTION OF SYMBOLS 11 Excavator 12L Crawler 13 Lower traveling body 14 Turning wheel 15 Upper turning body 16 Turning frame 17 Working machine 18 Cabin 19 Upper cover 20 Boom 21 Arm 22 Bucket 23 Boom hydraulic cylinder 24 Arm hydraulic cylinder 25 Bucket hydraulic cylinder 26 Bottom plate 27a Vertical plate 27b Vertical plate 28 Hydraulic hose 29 Relief valve 29a Block 30 Control valve 31 Bracket 31a Upper end 31b Lower end S1, S2 Gap

Claims (4)

A revolving frame having a bottom plate and a pair of vertical plates erected on the bottom plate at a required interval; a work machine disposed between the pair of vertical plates so as to be able to move up and down; A hydraulic cylinder for driving the machine, a hydraulic hose for transporting hydraulic pressure to the hydraulic cylinder, a relief valve having a valve operating rod protruding outward, and mounted on the bottom plate in parallel with the vertical plate. And a pipe mounting structure for a construction machine, wherein the relief valve is mounted integrally with the hydraulic hose on the vertical plate on the side adjacent to the cabin or tank.
A construction machine pipe mounting structure, wherein the relief valve is arranged on the vertical plate and the valve operating rod is directed downward.   2. The pipe mounting structure for a construction machine according to claim 1, wherein the relief valve is disposed on the vertical plate such that a tip end portion of the relief valve is inclined toward the inside of the pair of vertical plates.   The vertical plate includes a plate-like bracket whose lower end side is parallel to the vertical plate and whose upper end side is inclined toward the cabin or tank side, and the relief valve is provided at the upper end portion of the bracket. 3. The pipe mounting structure for a construction machine according to claim 1, wherein the piping hose is disposed integrally with the hydraulic hose.   4. The pipe mounting structure for a construction machine according to claim 1, wherein the hydraulic hose is disposed outside the region between the pair of vertical plates.

Images