JP3820126B2 - Excavator for swivel work machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an excavation apparatus for a swing working machine such as a backhoe.
[0002]
[Prior art]
For example, in a backhoe, a swivel base is supported on a traveling machine body having a crawler travel device so as to be capable of swiveling around a vertical axis, and a drilling device is provided at the front of the swivel base.
The excavator is provided with a receiving bracket at the front part of the swivel base, and a swing bracket is pivotally supported on the receiving bracket so as to be swingable around the vertical axis. The end of a boom cylinder that raises and lowers the boom is connected to the swing bracket, and a vertical movement member such as an arm is pivotally supported at the tip of the boom and the vertical movement member swings the vertical movement member. One end of the moving cylinder is connected, and the tip of the boom cylinder and the other end of the vertical moving cylinder are connected to the bent portion of the boom.
[0003]
[Problems to be solved by the invention]
In the prior art, both the boom cylinder and the vertical movement cylinder are arranged on the rear side of the boom so that contact with an obstacle can be avoided. The hydraulic piping is arranged along the outer surface such as the rear surface of the boom, and the hydraulic piping hits an object and is easily damaged, so that it looks bad.
An object of the present invention is to provide an excavating device for a swing working machine that can solve the problems of the prior art.
It is an object of the present invention to provide an excavating device for a swing working machine that can prevent damage to hydraulic piping by forming a boom in a hollow shape and allowing hydraulic piping to be inserted into the boom. .
[0004]
[Means for Solving the Problems]
The first specific means for solving the problems in the present invention is that a receiving bracket 3 is provided at the front portion of the swivel base 2, and the swing bracket 4 is pivotally supported on the receiving bracket 3 so as to be swingable around a vertical axis 5. The base end of the boom 6 bent in the middle is connected to the middle part of the swing bracket 4 in the vertical direction, and the end of the boom cylinder 7 that is disposed on the back side of the boom 6 and moves up and down the boom 6 at the upper part of the swing bracket 4. The vertical movement member 8 is pivotally supported at the tip of the boom 6, and one end of the vertical movement cylinder 9 that swings the vertical movement member 8 is connected to the vertical movement member 8, and the fulcrum member is connected to the bent portion P of the boom 6. 11 is provided in an outward projecting shape, and the tip of the boom cylinder 7 and the other end of the vertical movement cylinder 9 are connected to the fulcrum member 11 so that the boom 6 is formed in a hollow shape and bent at its end. The fulcrum member 11 of the part P Is that which forms the hydraulic pipe 34 through hole 12 in the side.
[0005]
As a result, the hydraulic piping 34 can be inserted from the end of the boom 6 to the bent portion P, and it is possible to avoid placing the hydraulic piping outside the boom 6.
The second specific means for solving the problems in the present invention is that, in addition to the first specific means, the boom 6 is hollow continuously over substantially the entire length between both end portions.
As a result, the hydraulic pipe 34 can be inserted over the entire length from one end to the other end of the boom 6.
[0006]
The third specific means for solving the problems in the present invention is that a hydraulic pipe insertion hole 12 is formed in the swing bracket 4 in addition to the first or second specific means.
As a result, the hydraulic piping can be inserted from the swivel base 2 into the boom 6 through the swing bracket 4.
In addition to any one of the first to third specific means, the fourth specific means for solving the problems in the present invention is that the base end of the boom 6 is bent in a direction opposite to the bending direction of the midway portion. It is that you are.
[0007]
Accordingly, the pivot point of the base end of the boom 6 and the end of the boom cylinder 7 can be arranged closer to the front-rear direction.
The fifth specific means for solving the problems in the present invention includes, in addition to any one of the first to fourth specific means, the fulcrum member 11 and the cylinder tubes 7B of the boom cylinder 7 and the vertical movement cylinder 9, respectively. 9B is connected.
As a result, both the hydraulic piping 34 connected to the boom cylinder 7 and the vertical movement cylinder 9 can be collectively led out from the hydraulic piping insertion hole 12 in the vicinity of the fulcrum member 11 of the bent portion P.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6, reference numeral 25 denotes a backhoe exemplified as a swivel working machine, and a swivel base 2 is supported on a travel machine body 27 having a left and right crawler travel device 26 so as to be turnable around a vertical swivel axis 28. The excavator 1 is provided in the front part of 2.
The swivel base 2 is equipped with an engine at the rear, a fuel tank, an oil tank, etc. are mounted on the right side, covered with a cover 29, and a driver's seat 30 is disposed behind the excavator 1 on the front side of the engine. A sunshade 31 is provided so as to surround the driver's seat 30 and the like.
[0009]
In the plan view, the swivel base 2 has a left and right side portion that is substantially parallel to the front and rear direction, a front portion that is substantially parallel to the front and rear direction, a rear portion that has an arc shape, and a corner portion between the front portion and the left and right side portions. Has an arc shape.
The left and right crawler traveling device 26 can move to the left and right with respect to the traveling machine body 27, that is, the distance between the heads can be adjusted. The peripheral portion including the shape of the left and right crawler traveling device 26 does not protrude so much outward from the outermost end.
[0010]
The excavator 1 has a receiving bracket 3 provided at the front part of the swivel base 2. The receiving bracket 3 is formed integrally with a member constituting the swivel base 2 or is separately formed and attached to the swivel base 2, and the receiving parts 3U and 3D separated in the vertical direction are projected forward from the front part thereof. The lower receiving part 3D has a bifurcated shape, and a hole through which the vertical axis 5 is inserted is formed in the upper and lower receiving parts 3U, 3D.
The excavator 1 includes a swing bracket 4 pivotally supported by a receiving bracket 3 via a longitudinal axis 5, a boom 6 pivotally supported by the base of the swing bracket 4, and a pivot around the horizontal axis at the tip of the boom 6. The arm 8 is freely pivotally supported, and the bucket 13 is pivotally supported at the tip of the arm 8 via a horizontal axis.
[0011]
The boom 6 is moved up and down by the boom cylinder 7, the arm 8 is swung up and down by the arm cylinder 9, and the bucket 13 is operated by the bucket cylinder 21 so as to be scooped and dumped. The cylinders 7, 9, and 21 are hydraulic cylinders.
In FIG. 2, the boom 6 can be raised and lowered by the boom cylinder 7 from the rising posture shown by the solid line to the lowering posture shown by the one-dot chain line through the two-dot chain line posture, and the arm 8 moves up and down by the arm cylinder 9 in each posture of the boom 6. The bucket 13 can be scooped and dumped by the bucket cylinder 21 in each posture of the boom 6 and the arm 8.
[0012]
The swing bracket 4 has upper and lower support portions 4U and 4D. The upper and lower support portions 4U and 4D have a hole through which the vertical axis 5 can be inserted, and the upper support portion 4U has a bifurcated shape. The lower support portion 4D is fitted into the bifurcated lower support portion 3D, and the vertical axis 5 is inserted through the lower support portion 4D so as to be swingably connected to the bracket 3 by receiving the swing bracket 4. .
The vertical axis 5 is divided into two concentric upper and lower axes, the upper axis connects the upper receiving part 3U and the upper supporting part 4U, and the lower axis connects the lower receiving part 3D and the lower supporting part 4D, There is a space between them. However, one vertical axis 5 may penetrate the upper and lower parts.
[0013]
In the swing bracket 4, the middle of the upper and lower support portions 4U and 4D is bifurcated in the left-right direction, and a hole surrounded by the left and right side walls 4A and the upper and lower support portions 4U and 4D is formed. Is an insertion hole 4 </ b> B for hydraulic piping, which will be described later, and a base end portion of the boom 6 is inserted and pivotally supported via a connecting pin 15.
The connecting pin 15 is disposed at a position very close to the vertical axis 5, and the base end portion of the boom 6 overlaps with the vertical support portions 4U and 4D in the front-rear direction.
[0014]
On the upper part of the swing bracket 4, a pair of left and right chicken crown-shaped support portions 4C are formed upward from the upper support portion 4U, and the cylinder rod 7A of the boom cylinder 7 is connected to the support portions 4C via pins 16. ing.
Further, the swing bracket 4 is in contact with a connecting arm portion 4E from one side of the upper and lower support portions 4U, 4D to the side, and a piston rod of the swing cylinder 33 pivotally supported by the swivel base 2 is connected.
The pin 16 to which the cylinder rod 7A is connected is located substantially immediately above the vertical axis 5 and is located closer to the swivel base 2 than the case where the pin 16 is positioned in front of the vertical axis 5, and this approached distance. Accordingly, the base end of the boom 6 can be disposed at the rear position, and the base end of the boom 6 can be disposed at the rear position by forming the insertion hole 4B in the swing bracket 4.
[0015]
Accordingly, the boom 6 and the boom cylinder 7 can be arranged as close as possible to the vertical axis 5 and the swivel base 2, and the swing bracket 4 that forms the outermost end of the front part of the swivel base 2 serves as the swivel base. As the amount of protrusion from 2 is reduced, the maximum radius of turning of the swivel base 2 is reduced, contact with external obstacles is reduced, and the weight balance is also improved.
The boom 6 is formed by fixing a band plate 6b to a U-shaped member 6a made of sheet metal to form an internal cavity main body 6A, and inserting and fixing a base end member 6B and a front end member 6C to both ends of the main body 6A. ing.
[0016]
The base end member 6B and the front end member 6C are cast products, forged products, or sheet metal products, respectively, and are formed with insertion holes 12A and 12B communicating with the inside of the hollow main body 6A. The hydraulic piping 34A can be inserted.
The boom 6 has a main body 6 </ b> A bent in the shape of a square when viewed from the side in the middle in the longitudinal direction, and a fulcrum member 11 formed of a pair of left and right plate members is fixed to the upper side (back surface) of the bent portion P. The fulcrum member 11 is substantially triangular in a side view, and a single pin 14 is provided in the vicinity of the apex.
[0017]
The base of the cylinder tube 7B of the boom cylinder 7 and the base of the cylinder tube 9B of the arm cylinder 9 are both connected to the pin 14, and the pin 14 is a common connecting pin for the two cylinders 7 and 9.
An insertion hole 12 </ b> C that is open upward is formed in the bent portion P to which the fulcrum member 11 is fixed, in the middle of the longitudinal direction of the main body 6 </ b> A of the boom 6, and pressure oil is supplied to the boom cylinder 7 and the arm cylinder 9. The hydraulic piping 34 </ b> A for supplying the gas can be inserted together.
[0018]
A base member 8A of the arm 8 is connected to the tip of the boom 6 via a connecting pin 17, and a cylinder rod 9A of the arm cylinder 9 and a bucket cylinder 21 are connected to the base member 8A.
The hydraulic piping 34 </ b> B for the bucket cylinder 21 passes outside through the insertion hole 12 </ b> B through substantially the entire length of the main body 6 </ b> A of the boom 6. The hydraulic pipe 34 </ b> C disposed along the hydraulic pipe 34 </ b> B is for a service port for supplying pressure oil when using a breaker, an auger or the like instead of the bucket 13.
[0019]
As shown in FIG. 1, the hydraulic pipes 34 </ b> A and 34 </ b> B are connected to a control valve 35 in the swivel base 2, and the control valve 35 can be operated by a control device 36 disposed on the left and right sides of the driver's seat 30. It has become.
The hydraulic pipes 34A and 34B pass from the control valve 35 in the swivel base 2 through the receiving bracket 3 to the outside, pass through the insertion hole 4B of the swing bracket 4, and enter the boom 6 through the insertion hole 12A. 34A exits from the insertion hole 12C and is connected to the boom cylinder 7 and the arm cylinder 9, and the hydraulic pipe 34B reaches the insertion hole 12B at the tip of the boom 6, from which the boom 6 exits and is connected to the bucket cylinder 21. ing.
[0020]
In the boom 6, a base end member 6B on the base end side is bent in a direction opposite to the bending of the main body 6A. That is, the base end side of the boom 6 in a substantially horizontal posture is bent in an upward-shaped shape.
When the boom 6 is swung upward and moved to the position shown by the solid line in FIG. 1 in the almost highest position, the highest position of the boom 6 can be made higher without contacting the upper support 4U as much as possible. This is because the connecting pin 15 at the base end of the boom 6 is brought as close as possible to the vertical axis 5 by the amount bent in reverse.
[0021]
FIG. 7 shows a modified example of the connection of the end portions of the cylinder tube. The fulcrum member 11 fixed to the back surface of the bent portion P of the main body 6A of the boom 6 is provided with two pins 14A and 14B. .
The base of the cylinder tube 7B of the boom cylinder 7 is connected to the pin 14A, the base of the cylinder tube 9B of the arm cylinder 9 is connected to the pin 14B, and the pins 14A and 14B are arranged close to each other. The boom cylinder 7 and the arm cylinder 9 are supported independently, and can be attached and detached separately.
[0022]
In addition, this invention is not limited to the said embodiment, A various deformation | transformation can be carried out. For example, the backhoe 25 exemplifies a small rear turning type in which the rear end of the swivel base 2 substantially coincides with the outermost end of the left and right crawler traveling device 26, but the rear end protrudes from the outermost end of the left and right crawler traveling device 26. A turning type may be sufficient and a power shovel may be sufficient as a turning working machine.
Further, the boom 6 can be integrally formed with a main body 6A, a base end member 6B, and a front end member 6C, and the boom 6 has a rectangular cross section by welding the left and right side walls and the upper and lower walls separately cut. In addition, the fulcrum member 11 may be integrally formed with the left and right side walls.
[0023]
【The invention's effect】
According to the present invention described above in detail, the hydraulic piping 34 to the boom cylinder 7, the vertical movement cylinder 9, etc. can be inserted into the boom 6 from the end of the boom 6 to the bent portion P. Thus, the hydraulic pipe 34 can be protected by the boom 6.
[Brief description of the drawings]
FIG. 1 is an overall side view showing an embodiment of the present invention.
FIG. 2 is a side view showing an operating range of the excavator.
FIG. 3 is a side view showing a main part.
4 is a view taken in the direction of arrow X in FIG. 3;
FIG. 5 is a side view of the base of the excavator.
FIG. 6 is a partial cross-sectional plan view of the base of the excavator.
FIG. 7 is a side view showing a modified example of coupling of cylinder base end portions.
8 is a view on arrow Y in FIG. 7;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Excavator 2 Swivel 3 Receiving bracket 4 Swing bracket 4A Insertion hole 5 Vertical axis 6 Boom 7 Boom cylinder 8 Vertical movement member 9 Vertical movement cylinder 11 Supporting member 12 Insertion hole 14 Pin 15 Pin 16 Connection pin 25 Backhoe )
34 Hydraulic piping P Bent part

Claims (2)

A receiving bracket is provided at the front part of the swivel base, the swing bracket is pivotally supported around the vertical axis so as to be swingable, and the base end of the boom bent in the middle is connected to the middle part of the swing bracket in the vertical direction. An end portion of a boom cylinder which is disposed on the rear side of the boom and is connected to an upper portion of the swing bracket and which moves the boom up and down is connected to a pivot member which is pivotally supported at the tip of the boom and swings on the vertically movable member. One end of the vertical movement cylinder is connected, and a fulcrum member is provided in an outward projecting shape at the bent portion of the boom, and the tip of the boom cylinder and the other end of the vertical movement cylinder are connected to the fulcrum member. It is formed in a hollow shape, and a hydraulic pipe insertion hole is formed in the vicinity of the fulcrum member of the end portion and the bent portion ,
A swing that bends the base end of the boom in a direction opposite to the bending direction of the middle part, arranges a pin for connecting the boom cylinder of the swing bracket directly above the vertical axis, and supports the base end of the boom on the vertical axis An excavation apparatus for a swing work machine, wherein the excavator is overlapped with a vertical support part of a bracket in a front-rear direction . A receiving bracket is provided at the front part of the swivel base, the swing bracket is pivotally supported around the vertical axis so as to be swingable, and the base end of the boom bent in the middle is connected to the middle part of the swing bracket in the vertical direction. A cylinder rod of a boom cylinder, which is disposed on the rear side of the boom above the vertical axis of the swing bracket and moves up and down the boom, is connected via a pin, and a vertical movement member is pivotally supported at the tip of the boom and the vertical movement is performed. A cylinder rod of a vertically moving cylinder that swings the member is connected to a member, and a fulcrum member is provided in an outward projecting manner at the bent portion of the boom, and each cylinder tube of the boom cylinder and the vertically moving cylinder is connected to the fulcrum member. And
The boom is formed in a hollow shape continuous over substantially the entire length between both ends, and a hydraulic pipe insertion hole is formed in the end and in the vicinity of the fulcrum member of the bent portion,
Forming an insertion hole in the swing bracket and connecting the base end of the boom to the left and right side walls of the insertion hole via a connection pin;
The hydraulic piping connected to the control valve in the swivel base passes through the insertion hole of the swing bracket, the hydraulic piping insertion hole of the end of the boom, and the hydraulic piping insertion hole of the bent portion of the boom. Connected to the cylinder tube,
A swing that bends the base end of the boom in a direction opposite to the bending direction of the middle part, arranges a pin that connects the cylinder rod of the boom cylinder directly above the vertical axis, and supports the base end of the boom on the vertical axis An excavation apparatus for a swing work machine, wherein the excavator is overlapped with a vertical support part of a bracket in a front-rear direction .

Images