JP5168180B2 - Mounting structure of operation pattern switching valve in work machine - Google Patents

Description

  The present invention relates to an operation pattern switching valve mounting structure for switching a combination of a remote control valve and a control valve operated by a remote control valve in a work machine such as a hydraulic excavator.

  The background art will be described using a hydraulic excavator as an example.

  A driver's seat is provided on the upper swinging body that is pivotably mounted on the lower traveling body, and an operation pattern switching valve (for example, a rotary switching valve, usually called a multi-control valve) is installed on the floor portion in front of the driver's seat. The

  This operation pattern switching valve is provided between a remote control valve in terms of hydraulic circuit and a plurality of control valves that are operated by this remote control valve and individually control the operation of the hydraulic actuator. By this operation pattern switching valve, The combination pattern of the remote control valve and each control valve can be switched as desired by the operator.

  The operation pattern switching valve is installed at a position that does not interfere with pedal operation, etc. on the driver's seat floor (for example, the left or right foot of the operator seated on the driver's seat). Connected by piping (hydraulic hose).

  One end of this pilot pipe is connected to the operation pattern switching valve, and the other end is connected to the remote control valve or the control valve through the space under the floor.

  The above configuration is shown in Patent Documents 1 and 2.

Japanese Utility Model Publication No. 6-4160 JP 2002-227249 A

  In the known techniques described in Patent Documents 1 and 2, the operation pattern switching valve is provided in a state of passing through the floor plate up and down, the upper part protruding on the floor plate, and the lower part positioned in the space below the floor. .

  Further, the pilot pipe is connected to a number of connection ports provided around the operation pattern switching valve via connectors, and is introduced below the floor by dropping the outer peripheral side of the switching valve apart.

  According to this known technique, the following problems have occurred.

  i) A switching valve occupation space combining the operation pattern switching valve and its pilot piping is required at the foot portion.

  In this case, since the pilot piping is separately introduced below the floor on the outer peripheral side of the operation pattern switching valve as described above, the horizontal switching valve occupation space becomes large, and the floor foot space is greatly eroded. . For this reason, pedal operability deteriorates.

  ii) Since the through hole for passing the operation pattern switching valve and its pilot pipe also becomes large, especially in a small excavator without a cabin (so-called mini excavator), valves (control valve and remote controller) arranged in the space under the floor Rainwater and garbage easily enter the pressure reducing valve).

  iii) Since the operation pattern switching valve is installed in a state of penetrating the floor plate (only the upper part protrudes on the floor plate), the entire switching valve including the connection portion of the pilot pipe is inspected. Visibility and accessibility are poor, and maintenance is poor in this respect.

  Therefore, the present invention eliminates the above problem, reduces the space occupied by the switching valve and expands the foot space, and can reduce the through hole of the floor plate to be provided for the operation pattern switching valve. An operation pattern switching valve mounting structure capable of improving maintainability is provided.

  According to the first aspect of the present invention, there are provided a plurality of control valves for controlling the operation of a plurality of hydraulic actuators, a plurality of remote control valves for operating the control valves, and an operation pattern switching for switching a combination pattern of the remote control valve and each control valve. The operation pattern switching valve is provided on the floor plate on which the driver's seat is provided, and the switching valve mount causes the entire switching valve to protrude above the floor plate to form a space between the floor plate and the operation plate. The pilot pipe that is attached in a state and connected to the operation pattern switching valve and introduced under the floor plate is bundled by the bundling means in the space portion.

  According to a second aspect of the present invention, in the configuration of the first aspect, the switching valve mount is formed in an L shape, wherein one side of the L shape is horizontal and the other side is vertical, and the lower end of the vertical side is While being attached to the floor plate, the front end portion of the horizontal side portion is attached to a handrail erected on the floor plate in front of the driver's seat.

  The terms “horizontal” and “vertical” include not only perfect horizontal and vertical but also almost horizontal and vertical.

  According to a third aspect of the present invention, in the configuration of the first or second aspect, the operation pattern switching valve is mounted on the floor plate of the upper swing body within the upper swing body swing range that is rotatably mounted on the lower traveling body. It is a thing.

  According to a fourth aspect of the present invention, in the configuration of any one of the first to third aspects, an entrance / exit for the driver's seat is provided, and the operation pattern switching valve is mounted on the floor plate on the side opposite to the entrance / exit. It is.

  According to the present invention, the operation pattern switching valve is mounted by the switching valve mount in a state where a space is formed between the floor plate and the pilot piping is bundled by the binding means in the space below the switching valve. Can be obtained.

I) Compared with a known technique in which pilot pipes are separately introduced below the floor, the horizontal switching valve occupation space combining the operation pattern switching valve and the pilot pipe can be remarkably reduced. For this reason, an operator's foot space can be expanded and improvement of pedal operability, simplification of equipment arrangement, and the like can be realized.

  II) The floor plate only needs to be provided with a piping hole for passing the pilot piping, and the size of the piping hole can be reduced to a minimum by bundling the pilot piping. For this reason, it becomes easy to prevent intrusion of rainwater and dust into valves (floor valves for control valves and remote control valves) under the floor.

  III) Since the entire operation pattern switching valve protrudes on the floor plate, the visibility and accessibility in the sense that the entire switching valve including the connection portion of the pilot pipe is inspected is remarkably improved. For this reason, the maintainability of the operation pattern switching valve can be improved.

  According to the second aspect of the present invention, the switching valve mount for mounting the operation pattern switching valve on the floor plate is formed in an L shape, and the vertical side portion is formed in a state where one side of the L shape is horizontal and the other side is vertical. Since the lower end of the frame is mounted on the floor plate and the front end of the horizontal side is mounted on the handrail in front of the driver's seat, the mounting area for the mount on the floor plate can be reduced compared to mounting the mount on the floor plate only. . For this reason, foot space can be expanded correspondingly and pedal operability can be improved.

  In this specification, “front and rear” and “left and right” refer to the front and rear and the left and right viewed from the operator seated in the driver's seat.

  According to the invention of claim 3, since the operation pattern switching valve does not protrude beyond the turning range of the upper-part turning body, there is no possibility that the switching valve comes into contact with the machine peripheral object during turning. In other words, the adverse effect of increasing the turning radius by the operation pattern switching valve does not occur.

  According to the invention of claim 4, since the operation pattern switching valve is mounted on the floor plate on the side opposite to the entrance / exit, there is no possibility that the switching valve becomes an obstacle to the raising and lowering of the operator.

1 is a schematic side view of a hydraulic excavator according to an embodiment of the present invention. It is the same top view. It is an expansion perspective view of an operation pattern switching valve and its attachment part. It is the same side view. It is the figure which expanded a part of FIG. 3 further. It is the perspective view which removed the operation pattern switching valve from FIG. 5, and was seen from another direction.

  In the embodiment, a small hydraulic excavator called a mini excavator is applied.

  As shown in FIGS. 1 and 2, the hydraulic excavator has an upper swing body 2 mounted on a crawler type lower traveling body 1 so as to be rotatable about a vertical axis. A boom and an arm are mounted on a front portion of the upper swing body 2. , Buckets, and work attachments (not shown) including hydraulic actuators (boom, arm, and bucket cylinders) that operate the buckets are attached.

  The upper swing body 2 has an upper frame 3. A driver seat 4 and various operation devices (reference numerals omitted) are provided on the upper surface of the rear portion of the upper frame 3, and an engine and related devices are mounted therein.

  A floor plate 5 is provided in front of the driver's seat 4, and a hand rail 6 serving as a handrail when the operator ascends and descends is erected over the entire width of the upper swing body 2 at the front end of the floor plate 5. ing.

  As shown in FIG. 3 and the like, the handrail 6 includes a plurality of upper and lower (two in the illustrated example) horizontal handrails 9 and 9 spanned between the left and right columns 7 and 8. The lower end is fixed to the upper frame 3.

  An operation pattern switching valve on the floor plate 5 at the front right side of the driver's seat 4, that is, on the side opposite to the operator entrance (front left side) and within the turning range (shown in FIG. 2) X of the upper swing body 2 10 is provided.

  In FIG. 1, in order to clearly distinguish the operation pattern switching valve 10 from other members, an operation device provided in the peripheral portion thereof is omitted.

  The operation pattern switching valve 10 is configured, for example, as a rotary switching valve that switches an oil passage by rotating a shaft (not shown) in a cylindrical body, and is mounted on the floor plate 5 by a switching valve mount 11.

  The switching valve mount 11 is formed in an L shape, and the vertical side portion 11a (only in FIG. 6) is formed with one side portion of the L shape being horizontal (including almost horizontal) and the other side being vertical (including substantially vertical). The lower end portion (with reference numeral) is attached to the floor plate 5, while the front end portion of the horizontal side portion 11 b is attached to the right column 8 of the handrail 6 with a U-bolt 12 and a nut 13.

  The horizontal side portion 11b is provided with a circular seat portion 11c, and the operation pattern switching valve 10 is placed on the seat portion 11c and fixed with bolts and nuts (not shown).

  Thus, the operation pattern switching valve 10 is mounted in a state where the entire switching valve protrudes above the floor plate and the space S is formed between the operation plate and the floor plate 5 (only reference numerals are attached to FIGS. 1 and 4). It has been.

  On the other hand, a circular pipe hole (through hole) 14 is provided at the front right end of the floor plate 5 that is directly below the operation pattern switching valve 10, and a number of pilot pipes connected to the peripheral connection ports of the operation pattern switching valve 10. 15... Penetrate through the piping hole 14 and are introduced into the space below the floor. Reference numeral 16 denotes a ring-shaped grommet (edge frame) attached to the piping hole 14.

  Here, the pilot pipes 15 are bundled by the bundling means 17 in the space S as shown in the figure, and are introduced below the floor in this bundled state.

  As the bundling means 17, a type in which a pipe bundle is fastened and fixed with a stopper like a belt of a trouser may be used, for example, the pilot pipes 15 may be bundled on both upper and lower sides of the space S as shown in the figure, A pair of halved cylindrical binders made of plastic or rubber may be fixed by bolts and nuts to form a cylindrical shape.

  In this way, the operation pattern switching valve 10 is mounted on the floor plate 5 by the switching valve mount 11 in a state where the space S is formed with the floor plate 5, and the pilot pipe 15 in the space S under the switching valve. Are combined by the bundling means 17. First, compared with the known technique in which the pilot pipes 15 are separately introduced under the floor, the operation pattern switching valve 10 and the pilot pipes 15 are combined in the horizontal direction. The switching valve occupation space can be greatly reduced.

  For this reason, an operator's foot space can be expanded and improvement of pedal operability, simplification of equipment arrangement, and the like can be realized.

  Second, the floor plate 5 may be provided with a piping hole 14 only for passing the pilot piping 15. Moreover, the size of the pipe hole 14 can be reduced to the minimum by bundling the pilot pipes 15.

  For this reason, it becomes easy to prevent intrusion of rainwater and dust into valves (floor valves for control valves and remote control valves) under the floor.

  Thirdly, since the entire operation pattern switching valve 10 protrudes on the floor plate 5, visibility and accessibility in the sense that the entire switching valve including the connection portion of the pilot pipe is inspected is remarkably improved.

  For this reason, the maintainability of the operation pattern switching valve can be improved.

  Further, the switching valve mount 11 is formed in an L shape, and the lower end of the vertical side portion 11a is operated on the floor plate 5 and the front end portion of the horizontal side portion 11b is operated in a state where one side of the L shape is horizontal and the other side is vertical. Since it is attached to the handrail 6 (right support column 8) in front of the seat, the mounting area of the mount on the floor plate 5 is small compared to the case where the switching valve mount is formed in a U-shape and mounted only on the floor plate 5, for example. I'm sorry.

  For this reason, foot space can be expanded correspondingly and pedal operability can be improved.

  Furthermore, since the operation pattern switching valve 10 does not protrude outside the turning range X of the upper swing body 2, there is no possibility that the switching valve 10 will come into contact with the machine peripheral objects during the turning. In other words, the operation pattern switching valve 10 does not cause the harmful effect of increasing the turning radius.

  Further, since the operation pattern switching valve 10 is mounted on the floor plate 5 on the side opposite to the entrance / exit, there is no possibility that the switching valve 10 becomes an obstacle to raising and lowering the operator.

Other Embodiments (1) In the above embodiment, the front end portion of the switching valve mount 11 is attached to the handrail column 8. However, when the front end of the frame is far from the handrail column 8, the switching valve mount is used. 11 may be mounted on the floor plate in a cantilever state where only the front side is free and the rear side is fixed. Alternatively, the mounting base 11 may be formed in a T shape, and only the lower end portion may be attached on the floor plate.

  (2) In the above embodiment, the operation pattern switching valve 10 is mounted on the floor plate on the right side in front of the driver's seat. However, a machine with the entrance / exit formed on the right side, or a sufficient frontage can be secured even when the entrance / exit is on the left side. In some cases, it may be provided on the left side.

  (3) The present invention is particularly suitable for a small-sized hydraulic excavator called a mini excavator, but can also be applied to medium and large excavators with cabins and work machines other than excavators.

DESCRIPTION OF SYMBOLS 1 Lower traveling body 2 Upper revolving body X Upper revolving body swivel range 3 Upper revolving body upper frame 4 Driver's seat 5 Floor plate 6 Hand rail 8 Hand rail right column 10 Operation pattern switching valve 11 Switching valve mount 11a Switching valve mount Vertical side portion 11b Horizontal side portion 11c Seat for switching valve mounting 12 U-shaped bolt for mounting switching valve mount 13 Nut S Space under switching valve 14 Piping hole 15 Pilot piping 17 Bundling means

Claims (4)

  A plurality of control valves for controlling the operation of a plurality of hydraulic actuators, a plurality of remote control valves for operating the control valves, and an operation pattern switching valve for switching a combination pattern of the remote control valves and the control valves. The pattern switching valve is mounted on the floor plate on which the driver's seat is provided, with the switching valve stand so that the entire switching valve protrudes above the floor plate and a space is formed between it and the floor plate. A structure for mounting an operation pattern switching valve in a work machine, wherein pilot piping connected to the pattern switching valve and introduced under the floor plate is bundled by a binding means in the space portion.   The switching valve mount is formed in an L shape, with one side portion of the L shape being horizontal and the other side portion being vertical, while the lower end portion of the vertical side portion is attached to the floor plate, while the front end portion of the horizontal side portion is 2. The operation pattern switching valve mounting structure in a work machine according to claim 1, wherein the operation pattern switching valve mounting structure is mounted on a handrail erected on a floor plate in front of the driver's seat.   3. The work machine according to claim 1, wherein the operation pattern switching valve is mounted on the floor plate of the upper swing body within a swing range of the upper swing body that is rotatably mounted on the lower traveling body. Mounting structure for operation pattern switching valve.   The operation in the work machine according to any one of claims 1 to 3, wherein an entrance / exit for a driver's seat is provided, and an operation pattern switching valve is mounted on the floor plate on the side opposite to the entrance / exit. Pattern switching valve mounting structure.

Images