JP2007008699A - Working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost working machine possible to be switched between civil engineering work and winch work. <P>SOLUTION: This working machine is provided with a first working device (a soil discharging device) to be operated by a first actuator 8a, a second working device (a bucket) to be operated by a second actuator 10a, a pair of hydraulic winches 12 and 13, a first direction control valve 20a to be connected to the first actuator or one of the hydraulic winches through a first selector valve 28a, and a second direction control valve 28b to be connected to the second actuator or the other one of the winches through the second selector valve 28b. This working machine performs the work using the first working device or the second working device or the work using the pair of hydraulic winches by switching the first selector valve and the second selector valve. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a work machine that can be switched by a simple operation for earthwork work or winch work such as forestry and can be provided at low cost.

Hydraulic excavator equipped with a work arm device with a bucket and a soil removal device with a blade as a working machine that is suitably used for earthwork work such as excavation, loading, and movement of earth and sand in forest road construction, soil preparation, etc. (For example, refer to Patent Document 1).

On the other hand, as a working machine suitable for winch work such as gathering in forestry, there is a swing yarder or a squirer equipped with two winches for drawing and feeding a wire through a guide pulley attached to a work arm device (for example, , See Patent Document 2).
JP 2004-156334 A (FIG. 2) Japanese Patent Laying-Open No. 2005-022793 (FIG. 2)

Each of the working machines as described above is prepared for earthwork work or winch work, and can perform each work efficiently, but it is relatively simple and suitable for small-scale earthwork work or winch work. In such a case, it is uneconomical to prepare two work machines.

The present invention has been made in view of the above facts, and the technical problem thereof is that one work machine can be switched for earthwork work or winch work by a simple operation, and can be provided at low cost. Is to do so.

According to the present invention, the working machine that solves the above technical problem includes a lower traveling body and an upper swinging body that is pivotably mounted on the lower traveling body, and the lower traveling body is operated by the first actuator. Equipped with a first working device, the upper swing body is connected to the second working device operated by the second actuator, a pair of hydraulic winches, and the first actuator or one hydraulic winch via the first switching valve. A first directional control valve to be connected, and a second directional control valve to be connected to the second actuator or the other hydraulic winch via a second directional control valve, and the first directional control valve and the second directional control valve By the switching, a work machine characterized in that work using the first work device and the second work device or work using a pair of hydraulic winches is performed.

Preferably, the first directional control valve has a “floating position” in which a pair of cylinder ports and a tank port communicate with each other. In the operation using the hydraulic winch, the one hydraulic winch is a “feeding winch” of a wire. The other hydraulic winch is used for the “drawing winch” of the wire.

In the present invention, the “drawing winch” means a winch that draws a wire, such as wood connected to a hook at the tip of the wire, and the “feeding winch” means the feeding winch. This means a winch that feeds a wire having a folded tip connected to the hook side of the conveyed object via a pulley provided ahead of the conveyed object in accordance with the drawing. Therefore, when the conveyed product is attracted to a predetermined place and the next conveyance is performed, the “feed winch” and the “drawing winch” are interchanged, and the hook is returned to the next conveyed item. .

According to the work machine configured in accordance with the present invention, one work machine can be used for work using the first work device and the second work device by switching the switching valve, or a winch using a pair of hydraulic winches. It can be used appropriately for work. In addition, since the first working device, the second working device, and the pair of hydraulic winches are controlled using the same hydraulic device by switching the switching valve, a work machine can be provided at low cost.

Hereinafter, a working machine configured in accordance with the present invention will be described in more detail with reference to the accompanying drawings illustrating preferred embodiments.

A description will be given with reference to FIG. 1 which is a hydraulic circuit diagram of the working machine and FIG. 2 which is a side view. First, a description will be given mainly with reference to FIG. The work machine denoted by reference numeral 2 includes a lower traveling body 4 having a pair of left and right crawler belts, and an upper revolving body 6 that is freely mounted on the lower traveling body 4 around a vertical axis 5 so as to be capable of swiveling.

The lower traveling body 4 includes a soil removal device 8 as a first working device that is moved up and down by a blade cylinder 8a as a first actuator.

On one end side of the swing body frame 6a of the upper swing body 6, a work arm device 10 having a bucket 10b as a second work device swingingly operated by a bucket cylinder 10a as a second actuator at the tip, A pair of hydraulic winches 12 and 13 are provided in the vicinity of the base end portion of the work arm device 10. The upper swing body 6 further includes a driver seat 6c having a plurality of control levers 6b, an engine compartment 6d containing the engine and the hydraulic control device, and a canopy 6e covering the upper side of the driver seat 6c on the swing body frame 6a. I have.

The work arm device 10 is an articulated arm device, and can swing freely in the vertical direction (vertical direction in FIG. 2) around the base end portion of the revolving body frame 6a and in the horizontal direction (perpendicular to the plane of FIG. 2). ) Swingably attached to the boom 10c, and an arm 10d attached to the tip of the boom 10c so as to be swingable in the vertical direction and a bucket 10b attached to the tip of the boom 10c so as to be swingable in the vertical direction. A boom cylinder 10e that swings the boom 10c is provided between the swing frame 6a and the boom 10c, and an arm cylinder 10f that swings the arm 10d is provided between the boom 10c and the arm 10d. The bucket cylinder 10a to be moved is provided between the arm 10d and the bucket 10b.

A guide pulley 14 on which a wire wound around a pair of hydraulic winches 12a and 12b is provided on the lower surface of the tip of the boom 10c. In addition, the installation position of this guide pulley 14 may be the end side to which the bucket 10b of the arm 10d is attached according to the form of the winch work, the size of the work machine, and the like.

Next, a description will be given mainly with reference to FIG. The work machine 2 has a pair of hydraulic pumps 18a and 18b driven by the engine 16, and a plurality of directional control valves operated by an operator that controls the discharged oil to supply and discharge the hydraulic actuators. A direction control valve group 20 is provided.

The plurality of hydraulic actuators include a hydraulic motor 12a of one hydraulic winch 12, a blade cylinder 8a, a hydraulic motor 13a of the other hydraulic winch 13, a bucket cylinder 10a, a boom cylinder 10e, a traveling motor 22a for driving a pair of crawler belts, 22b, an arm cylinder 10f, a turning motor 24 for turning the upper turning body 6, and a swing cylinder 26 for swinging the boom 10c to the left and right.

The directional control valve group 20 includes a first directional control valve 20a connected to the blade cylinder 8a or the hydraulic motor 12a of one hydraulic winch 12 via a first switching valve 28a, and the bucket cylinder 10a or the other hydraulic winch 13. A second directional control valve 20b connected to the hydraulic motor 13a via a second switching valve 28b is provided, and each of the boom cylinder 10e, the traveling motors 22a and 22b, the arm cylinder 10f, the swing motor 24, and the swing cylinder 26 is provided. Directional control valves 20c, 20d, 20e, 20f, 20g, and 20h are provided for connection.

The directional control valves 20b to 20h other than the first directional control valve 20a of the directional control valve group 20 are substantially the same, and have a three-position position having a pair of cylinder ports, a pump port, and a tank port. It is a switching valve. In the neutral position (the illustrated position) where no switching operation is performed, the communication between the respective ports is closed. The switching operation is performed by the control lever 6b in the driver's seat 6c (FIG. 2).

The first directional control valve 20a is a four-position switching valve having a “floating position” that has one more operating position than other directional control valves. In the “floating position” (the position indicated by F in the figure), the pair of cylinder ports A and B connected to the first switching valve 28 a and the tank port T connected to the tank 21 are communicated. In this “floating position”, a directional control valve is provided with a lock means (not shown) for releasably fixing the operation position such as a detent means.

The first switching valve 28a and the second switching valve 28b are substantially the same, and are a 6-port 2-position valve that is switched by manual operation, and is a first directional control valve 20a and a second directional control valve 20b. 2 ports connected to each other, 2 ports connecting these 2 ports to the bucket cylinder 10a or the dozer cylinder 8a at one switching position (shown position), and the hydraulic motor 12a or the hydraulic motor 13a at the other switching position, respectively. Two ports to connect are provided.

Accordingly, the first switching valve 28a and the second switching valve 28b are operated by the operation levers 29a and 29b, respectively, and are positioned at positions (positions shown) connected to the blade cylinder 8a and the bucket cylinder 10a. Further, the winch operation can be performed by operating the first directional control valve 20a and the second directional control valve 20b by positioning the hydraulic motors 12a and 13a at positions where they are connected. The operation levers 29a and 29b are installed at appropriate positions (not shown) near the driver's seat 6c (FIG. 2) or the hydraulic winches 12 and 13 (FIG. 2).

A typical winch operation using the two hydraulic winches 12 and 13 will be described with reference to FIGS. 1 and 2 and FIG. In the winch operation, one hydraulic winch 12 functions as a “feeding winch” of the wire and the other hydraulic winch 13 functions as a “drawing winch” of the wire, and the drawing wire 30 of the drawing winch 12 and the drawing wire of the drawing winch 13 The transport work of the transported object such as the wood 34 is performed by the 32 wires.

That is, the feeding wire 30 connected to the feeding winch 12 passes through the guide pulley 14 provided in the work arm device 10 of the work machine 2 and extends to the pulley 36a provided on the front post 36 ahead of the lumber 34 to be collected. These are connected to a carrier 38 movably attached to a feeding wire 30 stretched between the guide pulley 14 and the pulley 36a. On the other hand, the pulling wire 32 connected to the pulling winch 13 passes through the guide pulley 14 of the work arm device 10 and passes through the transporter 38, and a loading hook 40 is attached to the tip.

In order to collect the wood 34 to the work machine 2 side using this embodiment, the loading hook 40 is hung on the wood 34, the pulling winch 13 and the feeding winch 12 are operated, and the drawing wire 32 is wound. The wood 34 is drawn and conveyed to the work machine 2 side by feeding the feeding wire 30 while taking it. At this time, the first directional control valve 20a and the second directional control valve 20b are operated at the same time, and the feeding wire 30 is fed out by the two winches 12, 13 while winding the drawing wire 32 by an equal amount. Thus, the wood 30 can be held and transported at a certain height.

Further, when it is convenient to slide the wood 34 to be conveyed on the ground as shown by a two-dot chain line in FIG. 3, the first directional control valve 20a for operating the feeding winch 12 is set to the “floating position”. By fixing to the feeding wire 30, the transported object is pulled only by the operation of the second directional control valve 20 b that operates the drawing winch 13, that is, only the operation of the drawing winch 13, while giving an appropriate tension to the feeding wire 30. Can do.

In order for the conveyed product 34 to be attracted to a predetermined place and to be conveyed next, the feeding wire 30 is wound up by the feeding winch 12, the drawing wire 32 is fed out by the drawing winch 13, and the loading hook 40 is moved to the front pole 36 side. Return to the transported item.

In the earthwork work by the work machine 2, the drawing wire 30 and the drawing wire 32 are wound and accommodated in the drawing winch 13 and the drawing winch 12, and the earth and sand are excavated by using the bucket 10 b and the earth discharging device 8 of the working arm device 10. , Loading and moving.

The effects of the work machine 2 as described above will be described.

According to the work machine 2, one work machine is appropriately used for earth work using the bucket 10b and the soil removal device 8 by switching the switching valves 28a and 28b, or winch work using the pair of hydraulic winches 12 and 13. Can be used. And since the bucket 10b and the earth removal apparatus 8 and a pair of hydraulic winches 12 and 13 are controlled using the same hydraulic apparatus by installation of the switching valves 28a and 28b, the low-cost work machine 2 can be provided.

In the winch operation, the first directional control valve 20a for operating the first hydraulic winch 12, which is a payout winch, is fixed at the “floating position”, thereby attracting the payout wire 30 with an appropriate tension. The lumber 34 collected by only the operation of the second directional control valve 20b that operates the second hydraulic winch 13 that is a winch can be conveyed only by the operation of the drawing winch 13 by sliding the ground. The winch operation can be easily performed with only one operating lever.

Further, the directional control valve 20a for operating one hydraulic winch 12 has a “floating position” at which the hydraulic motor 12a can freely rotate. The installation of the “clutch” to be rotated is not necessary for the hydraulic winch 12, and the winch can be provided at low cost.

Further, in earthwork work using the earth removal device 8, the first directional control valve 20a for operating the blade cylinder 8a is positioned at the “floating position”, so that leveling work can be effectively performed. .

Furthermore, since the work machine 2 includes the earth removal device 8 in the lower traveling body 4, the work machine 2 pulls the conveyed object such as the wood 34 by bringing the earth removal device 8 into a state of stretching on the ground in the winch operation. The posture of 2 can be stabilized. Further, since the work machine 2 includes the upper swinging body 6 and the multi-joint work arm device 10 that can turn freely, the guide pulley 14 can be used in accordance with the transfer position and situation of the transfer object such as the wood 34 in the winch operation. Can be freely adjusted.

1 is a hydraulic circuit diagram of a work machine configured according to the present invention. The side view of the working machine provided with the hydraulic circuit of FIG. Explanatory drawing of the winch operation | work by the working machine comprised according to this invention.

Explanation of symbols

2: Work machine 4: Lower traveling body 6: Upper swing body 8: Earth removal device (first working device)
8a: Blade cylinder (first actuator)
10: Working arm device 10a: Bucket cylinder (second actuator)
10b: Bucket (second working device)
12: One hydraulic winch (feeding winch)
13: The other hydraulic winch (drawing winch)
20a: first direction control valve 20b: second direction control valve 28a: first switching valve 28b: second switching valve A, B: pair of cylinder ports T: tank port F: floating position

Claims (2)

A lower traveling body, and an upper revolving body that is pivotably mounted on the lower traveling body,
Undercarriage,
Equipped with a first working device actuated by a first actuator;
The upper swing body
A second working device actuated by a second actuator;
A pair of hydraulic winches,
A first directional control valve connected to the first actuator or one hydraulic winch via a first switching valve;
A second directional control valve connected to the second actuator or the other hydraulic winch via a second switching valve;
By switching between the first switching valve and the second switching valve, a work using the first working device and the second working device or a work using a pair of hydraulic winches is performed. Work machine. The first directional control valve has a “floating position” that communicates between a pair of cylinder ports and a tank port;
2. The work machine according to claim 1, wherein in the operation using the hydraulic winch, the one hydraulic winch is used for the “feeding winch” of the wire and the other hydraulic winch is used for the “drawing winch” of the wire.

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