JP2007092430A - Backhoe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable various types of pieces of hydraulic equipment to be operated by distributing and arranging a switch, which is used for feeding hydraulic oil to the hydraulic equipment constituting a ground work unit and the hydraulic equipment attached to the ground work unit, in each grip provided in a driver's seat. <P>SOLUTION: The switch for feeding the hydraulic oil to the hydraulic equipment constituting the ground work unit 5 and the hydraulic equipment attached to the unit 5 is distributed to and arranged in each of the grips 32 of two grip-type work operation means 43R and 43L which are provided in the manual operating device 29 of a backhoe 1; either of the grips 32 is provided with a volume switch 80 for feeding the hydraulic oil to the hydraulic equipment attached to the unit 5; and the other grip 32 is provided with an operating switch 81 for feeding the hydraulic oil to the hydraulic equipment constituting the unit 5, or the hydraulic equipment attached to the unit 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a backhoe having various operation switches in two grip type work operation means.

As a conventional backhoe, an excavator equipped with a boom, an arm, and a bucket as a ground work machine at the front of the upper structure that supports the upper structure on the traveling device so as to be rotatable around the vertical pivot axis. In addition, there is a hydraulic equipment such as a breaker attached to the ground work machine that can be replaced. In addition, some conventional backhoes include, for example, two boom pieces and two cylinders for operating the two booms (see, for example, Patent Document 1).
In a conventional backhoe having a two-piece boom, a first operation lever and a second operation lever are provided on the left and right of the front part of the driver's seat, and the second operation lever is a push that can be operated by a driver's finger. Two button-type switches are provided, and two booms are operated by operating these switches and the respective operation levers.
JP-A-8-195041

By the way, a ground work machine having only one boom and a ground work machine having two booms can be exchanged, and an auxiliary hydraulic device such as a breaker can be attached in place of the bucket of these ground work machines. In some cases, it is necessary to provide a further switch on the operating lever.
The present invention has been made in view of the above circumstances, and hydraulic equipment and / or ground work constituting the ground work device is provided on each grip of two grip type work operation means arranged on the left and right sides of the driver's seat. An object of the present invention is to provide a backhoe capable of operating various types of hydraulic equipment by distributing and arranging switches for supplying hydraulic oil to the hydraulic equipment attached to the apparatus.

The present invention takes the following technical means in order to achieve the above-mentioned problems.
That is, firstly, the backhoe according to the present invention is provided with a swivel base that can freely swivel in a traveling device, a support frame is provided at the front portion of the swivel base to support a ground work device that can swing, A platform is arranged from the front to the rear, a driver's seat, a driving control device for traveling and an operating device for operating the ground work device are provided on this platform, and a driver's seat mounting base is provided on the platform via a suspension device. A driver seat and an operation device are provided on the driver seat, and the operation device has two grip types arranged on the right and left sides of the driver seat so as to share a plurality of operations of the ground work device with two grips. It has work operation means, and each of the grips of the two grip-type work operation means is operated on a hydraulic equipment constituting the ground work apparatus and / or a hydraulic equipment attached to the ground work apparatus. A switch for supplying oil is arranged in a distributed manner, and a volume switch for supplying hydraulic oil to a hydraulic device attached to the ground work device is provided on one grip of the two grip type work operation means. The other grip of the grip-type work operation means is provided with an operation switch for supplying hydraulic oil to a hydraulic device constituting the ground work device or a hydraulic device attached to the ground work device.

According to this, a volume switch that supplies hydraulic oil to a hydraulic device that is attached to the ground work device is provided in one grip of the two grip type work operation means, and the hydraulic device that constitutes the ground work machine in the other grip or By providing an operation switch that supplies hydraulic oil to the hydraulic equipment attached to the ground work device, multiple types of hydraulic equipment can be operated, and the switches provided on each grip of the two grip type work means are used. By doing so, it becomes possible to make the hydraulic equipment attached to the ground work device perform complicated operations.
Second, the ground work device has a boom pivotally supported on the front portion of the support frame via a swing shaft, an arm pivotally supported on the tip of the boom so as to be vertically swingable, and a scooping action on the tip of the arm. A working tool pivotally supported, and the boom pivotally connects the first boom and the second boom via a horizontal axis and is provided with a bending / extending cylinder for bending and extending both booms. The grip operation switch is a switch for supplying hydraulic oil to the bending / extending cylinder.

According to this, even if the ground work device having the one-piece boom is replaced with the ground work device having the two-piece boom, the two-piece boom can be bent and stretched by the operation switch of the other grip. .
Third, the ground work device is provided with a second hydraulic device in addition to the first hydraulic device operated by the volume switch of one grip, and the operation switch of the other grip is the second hydraulic device. It is a switch for supplying hydraulic oil to the hydraulic equipment.
According to this, the hydraulic oil can be supplied to and driven by two types of hydraulic equipment by the volume switch of one grip and the operation switch of the other grip.

 Fourth, the ground work device includes a boom pivotally supported on a front portion of a support frame via a swing shaft, an arm pivotally supported on the tip of the boom so as to be vertically swingable, and a scooping operation on the tip of the arm. A working tool that is pivotally supported, and the boom pivotally connects the first boom and the second boom via a horizontal axis and is provided with a bending / extending cylinder for bending and extending both booms. The device is provided with a second hydraulic device in addition to the first hydraulic device operated by the volume switch of one grip, and the use of the operation switch is switched to the other grip adjacent to the operation switch. An application changeover switch is provided, and the operation switch of the other grip is supplied with the operation oil to the bending cylinder by the application changeover switch, and the operation oil is supplied to the second hydraulic device. It characterized that it is switchable into a mode to supply.

  According to this, the use switching switch provided on the other grip can selectively use the two-piece boom ground working device and the hydraulic equipment attached to the ground working device according to the purpose.

  According to the present invention, various types of hydraulic equipment can be operated by the switches that are distributed and arranged on the grips of the two grip type work operation means arranged on the left and right sides of the driver's seat.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 14, reference numeral 1 denotes a rear small turning type backhoe (turning work machine), which includes a lower traveling device 2, an upper upper structure 3, and a dozer device 4 attached to a front portion of the traveling device 2. The ground work device 5 mounted on the upper structure 3 is provided.
The traveling device 2 has crawler traveling means 7 on the left and right sides of the track frame 6 and can be driven by a hydraulic motor, and is a base of the upper structure 3 on the track frame 6 via a swing bearing 11. The swivel base 10 is supported so as to be turnable around a swivel center (vertical axis) X, and is driven by a swivel motor 8 provided on the swivel base 10. The dozer device 4 is provided with a blade that can be raised and lowered at the front portion of the track frame 6.

In the track frame 6, a swivel joint 12 is disposed at the center of the swivel bearing 11, and the swivel joint 12 projects into the swivel base 10.
The track frame 6 is provided with a swivel bearing 11 that swivels and supports a swivel base 10 on the upper surface of the upper plate and a swivel gear on the inner periphery thereof, and an attachment member is attached to the lower surface of the upper plate. The mounting portion of the swivel joint 12 is fixed to the upper plate, and the swivel joint 12 is arranged at the center of the center opening of the upper plate.
2 to 7, the upper structure 3 has an engine 15 on the left and right (right side) and a platform on the left and right other (left side) with respect to the swivel center X on which the swivel joint 12 is located. 16 and a hydraulic oil tank 17 and a fuel tank 18 are arranged at the rear, respectively, and a driver seat 26 on the platform 16 is located at the center side of the swivel base 10 and above the hydraulic oil tank 17 and the fuel tank 18. ing.

The platform 16 includes a case where a two-column type or four-column type lops is provided on the upper side thereof, and a case where the cabin device 27 is configured by mounting the cabin main body 27A.
On the swivel base 10, a bifurcated support frame 21 having left and right vertical ribs 19R and 19L and a swing bearing member 20 at the front end is provided. A swing shaft 22 is attached to the swing bearing member 20 of the support frame 21. The ground work device 5 is supported so as to be able to swing, and a swing cylinder 23 that swings the ground work device 5 is disposed on the left side of the turntable 10.
The swing shaft 22 is shifted to the left or right side (right side) with respect to the turning center X, and the center of the driver's seat 26 is shifted to the left or right side (left side) so that the work state by the ground work device 5 can be visually observed. ing.

The engine 15 is arranged on the swivel 10 on the right side of the left and right (right) vertical ribs 19R with the crankshaft 15A facing in the front-rear direction, and a radiator 57 and an oil cooler 58 are arranged in front of the engine 15. A hydraulic pump 59 is disposed on the rear side.
As described in detail in FIGS. 6 to 10, the support frame 21 has the right vertical rib 19 </ b> R substantially along the front-rear direction and is positioned substantially parallel to the engine 15, and the left vertical rib 19 </ b> L has a front portion 19 </ b> La. The swing bearing member 20 is attached to the front surface of the front portion 19La of the right vertical rib 19R.

The front surface of the front portion 19La has substantially the same vertical dimension as the rear surface of the swing bearing member 20, and the left and right dimensions are slightly longer. The left and right protruding portions are welded portions with the swing bearing member 20. It has become. The lower surface of the front portion 19La is welded to the swivel base 10, and the upper surface forms a mounting surface for attaching the platform 16 via the cushion material 76 together with the rear upper portion of the swing bearing member 20.
The left vertical rib 19L supports the swing cylinder 23 by extending the front portion 19La, an inclined portion 19Lb inclined rearward and outward from the front portion 19La, and the rear end of the inclined portion 19Lb in the left and right other directions. The rear portion 19Lc has a tail portion 19Ld bent rearward from the rear portion 19Lc. The rear portion 19Lc is also along the left-right direction and substantially parallel to the front portion 19La.

A connecting portion between the front portion 19La and the right vertical rib 19R is reinforced by a connecting member 86. A coupling member similar to the coupling member 86 may be provided at a bent portion between the front portion 19La and the inclined portion 19Lb.
On the front surface of the rear portion 19Lc, a pair of upper and lower brackets 23a that pivotally support the base portion of the swing cylinder 23 via a pin is provided. The upper bracket 23a is also welded to the inclined portion 19Lb, and reinforces the bent portion between the inclined portion 19Lb and the rear portion 19Lc.

A rear vertical rib 24 is provided from the rear portion 19Lc of the left vertical rib 19L to the rear portion of the swivel base 10, and the rear vertical rib 24 and the rear portion of the right vertical rib 19R are connected by a connecting member 25. The frame 21, including the rear vertical rib 24 and the connecting member 25, has a closed frame shape with a substantially trapezoidal shape in plan view, and is particularly robust against loads applied in the front-rear direction.
Since the left vertical rib 19L is bent in a substantially S shape in plan view, the left vertical rib 19L has a high mounting strength with the swivel base 10 and also serves to increase the strength in the left-right direction of the swivel base 10, and the rear vertical rib 24 and the connecting member The mounting strength of 25 is also increased.

A right vertical rib 19R on the engine 15 side is extended from the front part to the rear part of the swivel base 10 to form a lower partition part of the engine room 14, and an arrangement space for the engine room 14, the hydraulic oil tank 17 and the fuel tank 18 The vertical frame 61 of the engine room 14 is provided upward from the right vertical rib 19R.
The right vertical rib 19R is provided with mounting members 19Ra and 19Rb at the front and rear. The mounting members 19Ra and 19Rb and the front and rear mounting tables 63 provided at the right end of the swivel base 10 outside the mounting members 19Ra and 19Rb And an auxiliary equipment frame 65 that supports the engine auxiliary equipment 64 such as an air cleaner is mounted between the two.

The engine 15 is mounted using the right vertical rib 19R and is connected to the right vertical rib 19R to reinforce the right vertical rib 19R. The auxiliary device frame 65 also reinforces the right vertical rib 19R.
2, 7, 13, and 14, the vertical frame 61 includes a square frame 61A, a front partition plate 61B, and a rear partition plate (not shown) disposed between the engine room 14 and the platform 16 (or the cabin device 27). And the cover frame member 66, and are fixed to the auxiliary device frame 65 and the right vertical rib 19R.

The square frame 61A is a quadrangle made of a square pipe as a loop, and is a strength member. The front partition 61B is provided on the front side of the square frame 61A and covers the left side of the engine room 14. The rear partition plate is provided on the rear side of the square frame 61A and serves as a mounting member for the oil filter 88 as well as partitioning from the tank arrangement space, and these are fixed to the right vertical rib 19R.
The cover frame member 66 covers the upper edges of the square frame 61A and the front partition plate 61B, and has a cover portion 66A that covers the upper surface and the right side surface of the radiator 57.

The front partition 61B may extend to the rear partition and cover the entire surface of the square frame 61A, that is, cover the entire left side surface of the engine room 14.
The auxiliary device frame 65 includes a strip between the square frame 61A and the right end of the swivel base 10, and a strip between the square frame 61A and the right vertical rib 19R. Is located.
When the bonnet 35 covering the engine room 14 is pivotally supported on the vertical frame 61 and / or the auxiliary device frame 65 through a pivotal support portion in the front-rear direction, and the cabin device 27 is mounted. The upper side wall of the cabin device 27 on the engine side overlaps with the upper side of the vertical frame 61.

4, 6, and 7, a mounting frame 30 is mounted across the hydraulic oil tank 17 and the fuel tank 18 between the rear vertical rib 19 and the rear portion (or rear partition plate) of the right vertical rib 19 </ b> R. . The mounting frame 30 reinforces the rear portion of the support frame 21 and is mounted with a control valve 13.
The hydraulic oil tank 17 and the fuel tank 18 are vertically long and longitudinally formed and have a necessary and sufficient volume. Similarly, the hydraulic oil tank 17 and the fuel tank 18 are arranged side by side with an air conditioner 31 that is vertically long and longitudinally formed. Has been placed.

The hydraulic oil tank 17 is formed of sheet metal and is fixed to the upper surface of the swivel base 10, and the fuel tank 18 is formed of synthetic resin and is attached to the hydraulic oil tank 17 by an attachment band 18A. The hydraulic oil tank 17 may be formed of synthetic resin and the fuel tank 18 may be formed of sheet metal. The fuel tank 18 may be fixed to the swivel base 10 independently of the hydraulic oil tank 17.
The fuel tank 18 is arranged at a central position where the influence of the right / left inclination is small so that the fuel can be taken out even when the fuel is low and the swivel base 10 is inclined left / right.

A counterweight 73 is mounted on the rear part of the swivel base 10 and the connecting member 25, and a battery 74 is mounted on the left part of the swivel base 10. The counterweight 73 is formed with an opening 73A that exposes the fuel inlet 18B of the fuel tank 18 at the upper center, and a door 39 that opens and closes the opening 73A.
The platform 16 is arranged from the front part to the rear part of the swivel base 10, and from above the swing cylinder 23 and the battery 74 of the swivel base 10 to above the hydraulic oil tank 17, the fuel tank 18 and the counterweight 73. The front part is detachably mounted on the support leg 75 and the swing bearing member 20 at the front part of the swivel base 10 and the rear part is detachably mounted on the counterweight 73 (or the mounting frame 30) via the cushion material 76, respectively.

  4, 5, 12, and 13, the platform 16 is integrally formed of sheet metal or synthetic resin, and a step portion 16 </ b> A that forms a step surface above the swing cylinder 23 and the battery 74, A rising portion 16B that rises from the rear end of the step portion 16A and is positioned in front of the hydraulic oil tank 17 and the fuel tank 18, and extends upward from the upper end of the rising portion 16B to the hydraulic oil tank 17 and the fuel tank 18. A mounting portion 16C forming a driver seat mounting surface, a rear connecting portion 16D extending rearward and upward from the rear end of the mounting portion 16C to the counterweight 73, a step portion 16A, a rising portion 16B, Side wall portion 16E rising from the side edge on the engine side of mounting portion 16C and rear connecting portion 16D To have.

  A driver seat mounting base 42 is provided on the mounting portion 16C of the platform 16 via a suspension device 41. The driver seat mounting base 42 is provided with a driver seat 26 and an operating device 29. When receiving a large shake, the operation device 29 is shaken integrally with the driver's seat 26. The attachment portion 16 </ b> C is disposed lower than the top of the engine 15, at least the upper portion of the engine room 14. Since the mounting portion 16C can be lowered, the suspension device 41 can be used even when the driver's seat 26 is at the same height as the prior art.

Accordingly, the driver's seat 26 is disposed at an appropriate height and front and rear position without being obstructed by the engine that is the bulkier on the swivel base 10, the hydraulic oil tank 17, and the fuel tank 18. Further, as described above, the hydraulic oil tank 17, the fuel tank 18, and the air conditioner 31 below the driver's seat 26 are compactly accommodated on the swivel base 10 by utilizing the same shape.
The platform 16 is also provided with a traveling control device 28 and can constitute a bottom plate of the cabin device 27. The cabin device 27 surrounds the driver seat 26, the control device 28 and the operation device 29, and a cabin body 27A. Is configured on the platform 16.

1-3, 11-14, the cabin body 27A has a front portion 27a having a windshield, a back portion 27b having a rear glass, a side wall upper portion 27c having an engine side glass and a ceiling portion 27d, and a door 67 on the left side. The lower right side of the cabin body 27A is formed by the side wall portion 16E of the platform 16. The side wall portion 16E can also serve as the side wall of the engine room 14.
The side wall upper portion 27c extends to the upper side of the vertical frame 61, and an elastic seal member 69 is provided between the two. Even if the cabin device 27 vibrates up and down with respect to the swivel base 10, rainwater is generated in the cabin. Intrusion into the device 27 is prevented.

  The control device 28 on the platform 16 switches between the pedal / lever interlocking traveling operation means 43 in front of the driver's seat 26, the swing cylinder operating means 44 operated with the right foot, and the high and low speeds of the traveling device 2. A foot change switch 45 operated by one of the left and right feet and a hand change switch 46 operated by a hand on the same side as the foot change switch 45 are provided. More specifically, the foot changeover switch 45 and the hand changeover switch 46 for switching between the high and low speeds of the traveling device 2 are arranged at positions that can be operated by the right foot and right hand of the driver sitting on the driver seat 26.

In addition, a foot pedal 77 is provided at the left front portion of the platform 16 to supply hydraulic oil to hydraulic equipment attached to the ground work device 5 by left foot operation.
The operation device 29 has two grip-type work operation means 43R and 43L arranged on the left and right sides of the driver's seat 26 in order to share a plurality of operations of the ground work device 5 with two grips 32. The left grip type work operation means 43L is configured such that the driver can turn and retreat upward when getting on and off.
The grips 32R and 32L of the two grip-type work operation means 43R and 43L are pilots that pilot-operate the hydraulic equipment that constitutes the ground work device 5 such as the turning motor 8, the boom cylinder 52, the arm cylinder 54, and the work tool cylinder 56. Valves are allocated and arranged, and if there are other hydraulic equipment that constitutes the ground work device 5, the hydraulic equipment and / or hydraulic equipment to be attached to the ground work device 5 such as a breaker are included in the hydraulic equipment. Switches for supplying hydraulic oil are also distributed.

For example, the right (one) grip 32R is provided with a volume switch 80 and a phone switch 83 for supplying hydraulic oil to a hydraulic device attached to the ground work device 5, and the left (other) grip 32 has An operation switch 81 for selectively operating two types of hydraulic equipment and a use changeover switch 82 are provided.
Reference numeral 85 denotes a monitor for displaying a traveling / working state arranged at the upper right of the platform 16 and is attached to the side wall portion 16E (or a column is erected from the step portion 16A).
2, 3, 5, 11, the upper structure 3 includes a bonnet 35 that covers the upper surface and the outer surface of the engine room 14, a front cover 36 that covers the front surface of the engine room 14 on the front side of the cover portion 66 </ b> A, and the swivel base 10. And a lower side cover 37 that covers the space for arranging the swing cylinder 23 and the battery 74 is provided between the front portion of the platform 16 and the front portion of the platform 16 so as to be freely opened and closed. The outer peripheral edge of the swivel base 10 protrudes outward from the bonnet 35, the front cover 36, and the lower side cover 37, so as to minimize contact with obstacles.

An axial center of the pivot supporting the upper end of the bonnet 35 is arranged in the front-rear direction, and an axial center of the pivot supporting the lower end of the front cover 36 is arranged in the horizontal direction (or in the vertical direction). The shaft center of the pivot portion that pivotally supports the front end portion of the lower side cover 37 is arranged in the vertical direction.
A control valve 13 is disposed on the outer side of the hydraulic oil tank 17 between the swivel base 10 and the rear part of the platform 16, and a rear lateral cover 38 covering the control valve 13 is provided to be openable and closable. The axial center of the pivot part that pivots the part is arranged in the vertical direction. The lateral cover 38 may be opened and closed around the horizontal axis by providing a pivotal support at the lower front part.

While the control valve 13 is mounted on the rear side of the swivel base 10 and in the vicinity of the hydraulic oil tank 17 via the mounting frame 30, a relay junction is provided at a position of the platform 16 disposed in the vicinity thereof. 70 is attached.
Connected to the relay junction 70 are hoses that communicate with the control device 28 and the operation device 29 on the platform 16. These hoses are assembled and attached to the swivel base 10, and the relay junction 70, the control valve 13, Are connected by a hose, and the piping of the swivel base 10 and the piping of the platform 16 can be assembled and easily connected.

  1 and 16, the ground work device 5 is connected to a swing bracket 50 pivotally supported by a swing bearing member 20 of a support frame 21 via a swing shaft 22, and the swing bracket 50. A boom 51 that can be raised and lowered via a boom cylinder 52, an arm 53 that is pivotally connected to the tip of the boom 51 and that can be turned up and down around an abscissa via an arm cylinder 54, and It has a work tool (bucket) 55 that is pivotally connected to the tip and can be scooped through a work tool cylinder 56. The boom 51 is a two-piece boom that allows two members to bend and stretch. In some cases, one or more hydraulic devices having one or two hydraulic drive units are attached to the arm 53 or the work tool 55 or the like. Here, “attached” is a so-called option, and includes a case where it is attached to the arm 53 by exchanging it with a work tool, and a case where it is operated together with the work tool. As the hydraulic equipment attached to the ground work device 5 as described above, for example, there are a breaker, a fork, an auger, a mower, a vibro and other various devices. These attached hydraulic devices are connected to a hydraulic hose 72 from a service port 71 provided on the boom 51, and are driven by hydraulic pressure from a hydraulic pump 59.

The backhoe 1 according to this embodiment includes a ground working device 5 in which the boom 51 is configured by one member as shown in FIG. 1, and the boom 51 as shown in FIG. 16 includes a first boom 51 a and a second boom. The ground work device 5 divided into two parts 51b (hereinafter referred to as a two-piece boom type ground work device 5) can be exchanged and mounted.
FIG. 16 shows the backhoe 1 on which the two-piece boom type ground working device 5 is mounted.
In FIG. 16, the boom 51 of the two-piece boom type ground working device 5 includes a first boom 51a that is pivotally connected to the swing bracket 50 by a horizontal axis, and a top part of the first boom 51a via a horizontal axis 78. A second boom 51b that is movably connected is provided, and a bending / extending cylinder 79 is provided between the first boom 51a and the second boom 51b to bend and extend both the booms 51a, 51b.

The backhoe 1 attaches one of a plurality of hydraulic devices such as a breaker, a fork, an auger, a mower, and a vibro to the ground work device 5 as a first hydraulic device, and one other hydraulic device. Is attached as a second hydraulic device in addition to the first hydraulic device, the first hydraulic device can be operated by the volume switch 80, and the second hydraulic device can be operated by the operation switch 81. It has become.
Further, for example, when a rotary fork is attached to the ground work device 5, it is necessary to drive the two operations of the fork itself and the rotating operation of the fork by two driving units. The hydraulic oil can be supplied to one drive unit by operating the volume switch 80, and the hydraulic oil can be supplied to the other drive unit by operating the operation switch 81.

In this way, the backhoe 1 can attach various hydraulic devices to the ground work device 5 by arranging the operation switch 81 and the volume switch 82 to the left and right grips 32R and 32L. It becomes a high quality thing.
The backhoe 1 can also supply hydraulic oil to the first hydraulic device by the volume switch 80 by operating the foot pedal 77.
The application switching switch 82 is provided on the grip 32L in the vicinity of the operation switch 81.

The operation switch 81 supplies hydraulic oil to the bending / extending cylinder 79 when the two-piece boom type ground working device 5 is used by the operation. And when the 2nd hydraulic equipment is mounted in this ground work apparatus 5, the aspect (application) which supplies hydraulic oil to the bending cylinder 79 by the said use changeover switch 82, and a 2nd hydraulic equipment It switches to the mode (application) which supplies hydraulic oil.
The switching by the use changeover switch 82 will be described with reference to FIG.
In the hydraulic circuit diagram of FIG. 17, a state in which the bending cylinder 79 of the two-piece boom type ground working device 5 can be operated by the operation switch 81 is shown.

The operation switch 81 is configured so that two pilot valves for hydraulic pressure increase and hydraulic pressure decrease are interlocked. By operating the operation switch 81, the hydraulic pressure is controlled via the control valve 92a to expand and contract the expansion / contraction cylinder 79. It can be made to.
A pattern change valve 93 is provided between the operation switch 81 and the bending / extending cylinder 79 and the second hydraulic device 91. The pattern change valve 93 is interlocked with the operation of the application changeover switch 82. It has become.
When the application changeover switch 82 is pressed from the state shown in FIG. 17, the pattern change valve 93 is operated, and the oil path is switched so that the hydraulic oil from the hydraulic oil tank 17 flows to the second hydraulic equipment 91 side.

Accordingly, the second hydraulic device 91 can be operated by controlling the hydraulic pressure via the control valve 92b by operating the operation switch 81 again.
The operation switch 81 is a two-piece switch that supplies hydraulic oil to a bending cylinder 79 that causes the second boom 51b to bend and extend relative to the first boom 51a when the two-piece boom type ground working device 5 is used. ing. Thus, the backhoe 1 can replace the ground work device 5 in which the boom 51 is formed of one member and the two-piece boom type ground work device 5 in an exchangeable manner, and uses the two-piece boom type ground work device 5. Sometimes, the bending / extending cylinder 79 can be operated by the operation switch 81, so that not only the hydraulic equipment attached to the ground work machine 5 but also the hydraulic equipment (the bending / stretching cylinder 79) constituting the ground work apparatus 5 is operated. It will be able to do it, and it will be more versatile and convenient.

When an unload circuit is provided between the pilot pump 94 and the hydraulic oil tank 17 shown in FIG. 17 and a switch for operating the unload valve is disposed on one of the left and right grips 32R and 32L, and the driver does not intend. It is also possible to unload the pilot pressure so that the hydraulic equipment does not operate.
In the present invention, the shape of each member and the positional relationship of front / rear / left / right / up / down are best configured as shown in FIGS. However, it is not limited to the said embodiment, A member, a structure can be variously deformed, and a combination can also be changed.

For example, a radiator 57 is disposed behind the engine 15 and a hydraulic pump 59 is disposed in front, the left and right positions of the engine 15, the platform 16 and the cabin device 27 on the swivel base 10, and the left and right shapes of the support frame 21 are opposite to each other. Or you may.
Instead of the cabin main body 27A, a two-post type driver's seat protective frame is erected upward from the rear part of the platform 16 behind the driver's seat 26, and the rear column of the rear part of the platform 16 and the front part of the swivel base 10 are arranged. A four-poster type driver's seat protection frame having a front column and a awning roof may be erected.

  The present invention can be applied to a backhoe having various operation switches in two grip type work operation means.

1 is an overall side view showing an embodiment of the present invention. It is a whole perspective view from the right front. It is a whole perspective view from the left rear. It is a side view of an upper structure. It is a front view of an upper structure. It is a top view inside an upper structure. It is a perspective view inside an upper structure. It is a top view of a turntable. It is a perspective view of a turntable. It is a side view of a turntable. It is a schematic plan view of an upper structure. It is a top view of a platform. It is a perspective view of a platform. It is a partial cross section front view of an upper structure. It is an expanded sectional view between an engine room and a cabin device. It is a whole side view of a backhoe equipped with a 2 piece boom type ground working machine. It is a hydraulic circuit of the drive system of a bending cylinder and a 2nd hydraulic equipment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Backhoe 2 Traveling device 5 Ground working machine 10 Pivot 16 Platform 26 Driver's seat 28 Control device 29 Operating device 32 Grip 41 Suspension device 42 Driver's seat mounting base 43 Grip-type work operation means 51 Boom 51a First boom 51b Second boom 53 Arm 55 Work tool 66 Bending and extending cylinder 80 Volume switch 81 Operation switch 82 Application switch

Claims (4)

A swivel base is provided on the traveling device so that it can be swung freely. A support frame is provided at the front of the swivel base to support a ground work device that can swing. A driver's seat, a driving control device for driving, and an operating device for operating the ground work device are provided, a driver seat mounting base is provided on the platform via a suspension device, and a driver seat and an operating device are provided on the driver seat mounting base. And
The operating device has two grip-type work operating means arranged on the left and right sides of the driver's seat to share a plurality of operations of the ground work device with two grips. A switch for supplying hydraulic oil to the hydraulic equipment constituting the ground work device and / or the hydraulic equipment attached to the ground work device is allocated to each grip.
One grip of the two grip type work operation means is provided with a volume switch for supplying hydraulic oil to a hydraulic device attached to the ground work device,
The other grip of the two grip-type work operation means is provided with an operation switch for supplying hydraulic oil to a hydraulic device constituting the ground work device or a hydraulic device attached to the ground work device. . The ground working device includes a boom pivotally supported on a front portion of a support frame via a swing shaft, an arm pivotally supported at the tip of the boom so as to swing up and down, and pivotally supported at the tip of the arm. The boom is provided with a bending / extending cylinder for pivotally connecting the first boom and the second boom via a horizontal axis and for bending and extending both the booms,
2. The backhoe according to claim 1, wherein the operation switch of the other grip is a switch for supplying hydraulic oil to the bending cylinder. The ground work device includes a second hydraulic device in addition to the first hydraulic device operated by the volume switch of one grip,
The backhoe according to claim 1, wherein the operation switch of the other grip is a switch for supplying hydraulic oil to the second hydraulic device. The ground working device includes a boom pivotally supported on a front portion of a support frame via a swing shaft, an arm pivotally supported at the tip of the boom so as to swing up and down, and pivotally supported at the tip of the arm. The boom is provided with a bending / extending cylinder for pivotally connecting the first boom and the second boom via a horizontal axis and for bending and extending both the booms,
The ground work device includes a second hydraulic device in addition to the first hydraulic device operated by the volume switch of one grip,
The other grip is provided with a use switch adjacent to the operation switch for switching the use of the operation switch.
The operation switch for the other grip can be switched between the mode for supplying hydraulic oil to the bending cylinder and the mode for supplying hydraulic oil to the second hydraulic device by the application changeover switch. The backhoe according to claim 1.

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