JP2017160738A - Piping structure of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a control valve and a solenoid valve by pilot piping before attaching a placing base to an upper frame while alleviating a load applied to the placing base of the control valve.SOLUTION: A placing base 40 has a pedestal part 41 on which a control valve 30 is placed, a support leg 42 extending downwardly from the pedestal part 41, and a flange part 43 which hangs out along a bottom plate 22 of an upper frame 21 from a lower end part of the support leg 42, and is attached to the bottom plate 22. A columnar support 50 for supporting a protection cover 60 is erectly attached to an upper face of the flange part 43. A solenoid valve 35 is attached to a sidewall face of the columnar support 50. The solenoid valve 35 is connected to the control valve 30 via pilot piping 36.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a piping structure of a construction machine.

  Conventionally, a multiple valve as a control valve unit arranged on the upper frame via a support bracket and an upper surface of the multiple valve provided integrally on the mounting surface of the valve casing of the multiple valve There is known a valve support device for a construction machine including a solenoid valve (see, for example, Patent Document 1).

  By the way, in the configuration in which the solenoid valve is mounted on the upper side of the valve casing of the multiple valve as in the invention of Patent Document 1, the position of the center of gravity becomes high, so that the load applied to the support bracket is increased and the strength is increased. There is a problem that it becomes disadvantageous.

  Therefore, it is conceivable to attach a bracket different from the support bracket of the multiple valve on the upper frame and arrange the solenoid valve at a position above the multiple valve via this bracket.

Japanese Patent No. 3273537

  However, when the multiple valve and the solenoid valve are supported by separate brackets and mounted on the upper frame, there is a problem in that the pilot pipe cannot be routed in advance. In other words, after installing the multiple valve and solenoid valve on the upper frame, it is necessary to perform the work of connecting the multiple valve and solenoid valve with pilot piping in a narrow work space, and the wiring work is complicated. End up.

  The present invention has been made in view of the above points, and an object thereof is to reduce the load applied to the mounting base of the control valve and to pilot the control valve and the solenoid valve before attaching the mounting base to the upper frame. The purpose is to enable connection by piping.

  The present invention includes a mounting table provided on an upper frame of an upper swing body, a control valve mounted on the mounting table, and a solenoid valve connected to the control valve via a pilot pipe. The following solutions were taken for the piping structure of the machine.

That is, according to the first aspect of the present invention, the mounting table includes a pedestal portion on which the control valve is mounted, a support leg extending downward from the pedestal portion, and a lower end portion of the support leg extending along the upper frame. And a flange portion attached to the upper frame,
A protective cover for protecting the control valve;
A support column that stands from the upper surface of the flange portion and supports the protective cover;
The solenoid valve is attached to a side wall surface of the support column.

  In the first invention, the control valve is mounted on the mounting table. A support column that supports the protective cover is attached to the flange portion of the mounting table. A solenoid valve is attached to the side wall surface of the column.

  With such a configuration, the operation of connecting the control valve and the solenoid valve by the pilot pipe can be performed in advance before the mounting table is attached to the upper frame, and the routing workability is improved.

  Specifically, conventionally, after mounting the mounting table on which the control valve is mounted on the upper frame and mounting the mounting member on which the solenoid valve is mounted on the upper frame, the control valve and the solenoid are installed in a narrow work space. Work to connect the valve with the pilot piping had to be done.

  On the other hand, in the present invention, the mounting table, control valve, support column, solenoid valve, and pilot piping can be handled as one unit in a preassembled state, and this unit can be installed by simply attaching it to the upper frame. Since the work is completed, workability is improved. Further, since the solenoid valve is attached to the support column instead of the mounting table, the load applied to the mounting table can be reduced by the weight of the solenoid valve.

  In addition, since the column supporting the protective cover is also used as a mounting member for mounting the solenoid valve, the number of parts can be reduced and the installation space can be effectively utilized as much as the mounting member is no longer needed. Can do.

According to a second invention, in the first invention,
The flange portion is formed with a screw hole penetrating in the thickness direction,
At the lower end of the column, an insertion hole corresponding to the screw hole is formed, and a fixing portion is provided that is fastened to the flange portion by a fastening bolt,
An escape portion for avoiding interference with the front end portion of the fastening bolt is formed at a position corresponding to the screw hole in the upper frame.

  In the second invention, the fixing portion of the column is fastened to the flange portion by the fastening bolt. Here, since the relief part is formed in the upper frame, even when the tip part of the fastening bolt protrudes from the lower surface of the flange part, it does not interfere with the upper frame.

According to a third invention, in the first or second invention,
The protective cover has a side cover standing on the side of the upper frame, and an inner cover facing the side cover across the control valve,
A cross beam portion for connecting the side cover and the inner cover is provided at an upper end portion of the support column.

  In 3rd invention, the side cover and the inner side cover are connected by the cross beam part provided in the upper end part of the support | pillar. Thereby, one support column can be used as a support member for supporting the side cover and the inner cover, respectively, and the number of parts can be reduced.

According to a fourth invention, in the third invention,
In the upper part of the horizontal beam part, an elevating step for an operator to move up and down to the upper part of the upper swing body is provided.

  In 4th invention, when an raising / lowering step is provided in the upper part of a highly rigid cross beam part, when an operator raises / lowers an raising / lowering step, it can support firmly so that an raising / lowering step may not bend.

  According to the present invention, the operation of connecting the control valve and the solenoid valve by the pilot pipe can be performed in advance before the mounting table is attached to the upper frame, and the routing workability is improved. Further, since the solenoid valve is attached to the support column instead of the mounting table, the load applied to the mounting table can be reduced by the weight of the solenoid valve.

It is a perspective view showing the whole construction machine composition concerning this embodiment. It is a top view which shows the structure of an upper turning body. It is a perspective view when the arrangement structure of a control valve and a solenoid valve is seen from the right front. It is a top view which shows the arrangement structure of a control valve and a solenoid valve. It is a side view which shows the structure of a solenoid valve. It is a perspective view when a protective cover and a support | pillar are seen from the left front. It is a perspective view when a protective cover and a raising / lowering step are seen from the right front.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention, its application, or its use. In each figure, the up / down and front / rear / left / right directions are indicated by arrows. Unless stated otherwise, the vertical direction will be described according to the directions indicated by these arrows.

  As shown in FIG. 1, the construction machine 10 includes a crawler type lower traveling body 11 and an upper revolving body 20 that is rotatably mounted on the lower traveling body 11. The upper swing body 20 is provided with an attachment 13, a cab 14, a machine room 15, an upper frame 21, and the like.

  The attachment 13 is installed in the front part of the upper turning body 20, and is composed of a boom 13a, an arm 13b, a bucket 13c, and the like. Each of the booms 13a and the like operates in conjunction with the expansion and contraction of the hydraulic cylinder 13d that is hydraulically controlled, and performs operations such as excavation. The operation of the boom 13a and the like is performed in the cab 14.

  The cab 14 is a rectangular box-shaped cab, and is installed adjacent to the attachment 13 at the left front portion of the upper swing body 20. The machine room 15 is provided at the rear part of the upper swing body 20. The periphery of the machine room 15 is covered with a machine room cover 16. In the construction machine 10, a part of the machine room cover 16 that covers the rear part of the machine room 15 is configured by a counterweight that secures a front-rear balance with the attachment 13.

  As shown in FIG. 2, the upper frame 21 includes a bottom plate 22, a pair of vertical plates 23, and a horizontal beam 24. The pair of vertical plates 23 extend in parallel in the front-rear direction from the front end portion to the rear end portion of the bottom plate 22 in the middle portion of the bottom plate 22 in the left-right width direction. The vertical plate 23 is erected so as to be welded to the bottom plate 22 and orthogonal to the bottom plate 22.

  The lateral beam 24 is disposed so as to extend in the width direction from the left end portion to the right end portion of the bottom plate 22 in the middle portion of the bottom plate 22 in the front-rear direction, and is integrally joined to the bottom plate 22 and the pair of vertical plates 23.

  The engine 25 is accommodated in the machine room 15 so that the drive shaft thereof faces in the left-right direction of the bottom plate 22. A hydraulic pump 26 is disposed on the right side of the engine 25.

  On the right side of the vertical plate 23 on the right side, a control valve 30 and a solenoid valve 35 are arranged side by side. Between the pair of vertical plates 23, two turning motors 27 are arranged side by side.

  The hydraulic pump 26 and the control valve 30 are connected via a hydraulic pipe 31. The hydraulic pump 26 discharges hydraulic oil and pumps it to the control valve 30 via the hydraulic pipe 31.

  The control valve 30 and the solenoid valve 35 are connected via a pilot pipe 36. The control valve 30 controls the amount of hydraulic oil supplied to the hydraulic cylinder 13d, the swing motor 27 and the like according to the pilot hydraulic pressure output from the solenoid valve 35.

  Specifically, when the operator operates an operation lever (not shown), the opening degree of the solenoid valve 35 is adjusted according to the operation amount, and the pilot hydraulic pressure is output. The control valve 30 operates the hydraulic cylinder 13d and the like by supplying the hydraulic oil discharged from the hydraulic pump 26 to the corresponding hydraulic cylinder 13d and the like.

  As shown in FIGS. 3 to 5, the control valve 30 is configured by a block body formed in a substantially rectangular parallelepiped shape, and is placed on a mounting table 40. The mounting table 40 includes a pedestal portion 41 on which the control valve 30 is mounted, a support leg 42 extending downward from the front end portion and the rear end portion of the pedestal portion 41, and lower end portions of the front and rear support legs 42. And a flange portion 43 projecting forward and rearward along the upper frame 21. The flange portion 43 is fastened to the bottom plate 22 of the upper frame 21 by fastening bolts 45.

  In the present embodiment, since the corner on the right front side of the bottom plate 22 has an arc shape, the mounting table 40 is inclined in the left direction toward the front in a plan view according to the arc shape. It is attached to the upper frame 21. Therefore, the control valve 30 mounted on the mounting table 40 is similarly inclined obliquely leftward toward the front in plan view.

  A hydraulic port 32 to which a hydraulic pipe 31 is connected is provided on the left front and right rear side wall surfaces of the control valve 30. A pilot port 33 to which a pilot pipe 36 is connected is provided on the right front and left rear side wall surfaces of the control valve 30.

  The solenoid valve 35 is attached to the side wall surface of the column 50 that supports the protective cover 60. The column 50 includes a column main body 51 extending in the vertical direction, a plate-shaped fixing unit 52 bonded to the lower end of the column main body 51, and a horizontal beam unit bonded to the upper end of the column main body 51 and extending in the horizontal direction. 55.

  The column main body 51 is formed of a plate-like body that is bent into a concave cross section with an opening at the rear. The solenoid valve 35 is attached to the left wall surface of the column main body 51. A plurality of joints 37 are attached to the left side surface of the solenoid valve 35 at intervals in the vertical direction, and a pilot pipe 36 connected to the joint 37 is connected to the pilot port 33 of the control valve 30.

  Two insertion holes 53 are formed in the fixing portion 52 at intervals in the front-rear direction. Further, two screw holes 44 are formed in the flange portion 43 so as to correspond to the insertion holes 53. The screw hole 44 penetrates the flange portion 43 in the thickness direction.

  Then, the fixing portion 52 is fastened to the flange portion 43 by inserting the shaft portion of the fastening bolt 45 through the insertion hole 53 and screwing it into the screw hole 44. Thereby, the support | pillar 50 will be attached to the flange part 43 of the mounting base 40. FIG.

  As described above, according to the piping structure of the construction machine 10 according to the present embodiment, the mounting table 40, the control valve 30, the column 50, the solenoid valve 35, and the pilot piping 36 are assembled in advance as one unit. Since the wiring work is completed simply by attaching this unit to the bottom plate 22 of the upper frame 21, workability is improved.

  Further, since the solenoid valve 35 is attached not to the mounting table 40 but to the support column 50 side, the load applied to the mounting table 40 can be reduced by the weight of the solenoid valve 35.

  Here, as shown in FIG. 5, a recess 22 a as an escape portion is formed at a position corresponding to the screw hole 44 in the bottom plate 22. The recess 22a is for avoiding interference with the bottom plate 22 even when the front end portion of the fastening bolt 45 protrudes from the lower surface of the flange portion 43 when the support column 50 is fastened to the flange portion 43 by the fastening bolt 45. Is formed. In addition, you may form an escape part with a through-hole instead of the recessed part 22a.

  As shown in FIGS. 6 and 7, the left and right sides of the control valve 30 and the solenoid valve 35 are covered with a protective cover 60. The protective cover 60 protects the control valve 30 and the solenoid valve 35, and has an elevating step 65 for the operator to elevate and lower the upper part of the upper swing body 20.

  The protective cover 60 includes a side cover 61 that stands on the right side of the upper frame 21 and an inner cover 62 that faces the side cover 61 with the control valve 30 interposed therebetween. The elevating step 65 is disposed between the side cover 61 and the inner cover 62 and is formed in a step shape.

  The side cover 61 is supported so as to be openable and closable around a central shaft 63 (see FIG. 4) standing on the rear side of the side cover 61. A lock mechanism 64 is provided at the front end of the side cover 61.

  The horizontal beam portion 55 of the column 50 supports the side cover 61 and the inner cover 62 by connecting them. Specifically, a connecting portion 56 that extends downward along the inner cover 62 is provided at the left end portion of the cross beam portion 55. The inner cover 62 and the connecting portion 56 are fastened by fastening bolts 45. Two fastening bolts 45 are arranged at intervals in the vertical direction.

  A stopper 57 that comes into contact with the side cover 61 when the side cover 61 is closed, and a striker 58 that engages with the lock mechanism 64 of the side cover 61 are provided at the right end of the horizontal beam portion 55.

  Thereby, one support column 50 can be used as a support member for supporting the side cover 61 and the inner cover 62, respectively, and the number of parts can be reduced.

  Further, an elevating step 65 is provided on the upper part of the horizontal beam portion 55. Thus, by providing the raising / lowering step 65 on the upper part of the highly rigid cross beam part 55, when the operator raises / lowers the raising / lowering step 65, it can support firmly so that the raising / lowering step 65 may not bend.

  As described above, the present invention is highly practical in that the control valve and the solenoid valve can be connected by a pilot pipe before the mounting table is attached to the upper frame while reducing the load applied to the mounting table of the control valve. Since the effect is obtained, it is extremely useful and has high industrial applicability.

DESCRIPTION OF SYMBOLS 10 Construction machine 20 Upper turning body 21 Upper frame 22a Recessed part (relief part)
30 Control Valve 35 Solenoid Valve 36 Pilot Piping 40 Mounting Base 41 Base Part 42 Support Leg 43 Flange Part 44 Screw Hole 45 Fastening Bolt 50 Post 52 Fixed Part 53 Insertion Hole 55 Horizontal Beam Part 60 Protective Cover 61 Side Cover 62 Inner Cover 65 Lifting Step

Claims (4)

Piping structure of a construction machine comprising a mounting table provided on the upper frame of the upper swing body, a control valve mounted on the mounting table, and a solenoid valve connected to the control valve via a pilot pipe Because
The mounting table includes a pedestal portion on which the control valve is mounted, a support leg extending downward from the pedestal portion, and a flange that projects from the lower end portion of the support leg along the upper frame and is attached to the upper frame. And
A protective cover for protecting the control valve;
A support column that stands from the upper surface of the flange portion and supports the protective cover;
A piping structure for a construction machine, wherein the solenoid valve is attached to a side wall surface of the support column. In claim 1,
The flange portion is formed with a screw hole penetrating in the thickness direction,
At the lower end of the column, an insertion hole corresponding to the screw hole is formed, and a fixing portion is provided that is fastened to the flange portion by a fastening bolt,
A piping structure for a construction machine, wherein a relief portion for avoiding interference with a tip portion of the fastening bolt is formed at a position corresponding to the screw hole in the upper frame. In claim 1 or 2,
The protective cover has a side cover standing on the side of the upper frame, and an inner cover facing the side cover across the control valve,
A pipe structure for a construction machine, characterized in that a lateral beam portion for connecting the side cover and the inner cover is provided at an upper end portion of the support column. In claim 3,
A piping structure for a construction machine, characterized in that an elevating step for an operator to elevate and lower the upper part of the upper swing body is provided at the upper part of the horizontal beam part.

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