JP2573979Y2 - Turning position fixing device for upper revolving unit such as vertical excavator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an upper revolving unit for a construction machine such as a vertical excavator in which an upper revolving unit is provided so as to be able to revolve horizontally with respect to a lower traveling unit such as an excavator and a pile driver. The present invention relates to a turning position fixing device.

[0002]

2. Description of the Related Art In this type of construction machine such as a vertical excavator,
A slewing bearing is arranged between the upper revolving unit and the lower traveling unit, and an internal gear coaxial with the slewing bearing is fixed on the upper surface of the lower traveling unit on the inner periphery of the slewing bearing. It is common to mount a turning device that meshes a small gear of the output shaft of the turning drive motor with the internal gear, and turns the upper turning body by rotation of the turning drive motor,
The turning device is provided with a brake device for stopping the turning of the upper turning body.

However, simply stopping the turning of the upper revolving structure by the brake device causes a play due to the accumulation of the backlash of each of the small gear and the internal gear, and the accumulated play depends on the turning radius of the turning of the upper revolving structure. Related, but in particular,
In a vertical excavator that performs simultaneous multi-hole excavation work, play at the excavation position cannot be ignored and becomes an important problem.

[0004] As an adverse effect of this play, since the excavation hole is obliquely dug or becomes an elliptical hole, a bending moment is applied to a screw rod or the like, which is disadvantageous in the strength of the rod. In addition, an impact due to a change in load of the excavating force during the operation adversely affects the swivel bearing in the swivel device, and indents or sets on the meshing surfaces of the gears.

[0005] For this reason, there is an apparatus provided with a fixing device for locking the swing of the upper swing body at a predetermined position. For example, a fixing device disclosed in Japanese Utility Model Laid-Open Publication No. Hei 2-106053 has a ring-shaped braked plate fixedly mounted on the outer periphery of a cylindrical bracket of a lower traveling body that supports the inner ring of the turning device, and an upper revolving structure around the outer ring of the turning device. A holding device for holding the braked plate from above and below is fixed to the lower surface.

The holding device includes a pair of upper and lower holding portions having tapered surfaces converging toward the distal end formed inside the holding plate and arranged vertically opposite the plate to be braked. It is composed of a pair of wedge-shaped holding pieces and a cylinder that moves the two holding pieces forward and backward and presses and releases the brake plate from above and below with both holding pieces.

In the fixing device disclosed in Japanese Utility Model Laid-Open No. 3-58351, a plurality of brake plates are erected on the lower traveling body outside the turning device, and the same plate as the above-described holding device is provided on the lower surface of the upper turning structure. In the configuration, a clamping device for clamping and releasing the brake plate from both sides is fixed.

[0008]

However, in the above configuration, since the plate to be braked is sandwiched between the two holding pieces of the holding device, if the plate to be braked is locally deformed by an external force or the like, the plate to be braked is damaged. When the braking plate and the holding piece slide, the resistance of the turning operation is caused. When the deformation is large, the holding device may not operate reliably. Furthermore, if mud or the like gets into the holding portion where the wedge-shaped holding piece slides, the device may not operate reliably. In addition, since the wedge-shaped holding piece and the cylinder are provided inside the holding portion, maintenance and inspection are troublesome. It is.

Accordingly, the present invention is to provide a device for fixing the turning position of an upper turning body such as a vertical excavator which can be operated reliably even when the brake target plate is locally deformed and which can be easily maintained and inspected. The purpose is.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an upper revolving unit which is pivotable with respect to a lower traveling unit in a horizontal direction via a revolving device. A shaft provided with a plate to be braked concentrically with the center of rotation of the revolving device on one of the revolving structures, and a clamping device for clamping the plate to be braked on the other of the lower traveling structure and the upper revolving structure; In a turning position fixing device for an upper turning body such as an excavator, the plate to be braked is formed of a cylindrical body that opens vertically, and the cylindrical body is fixed to the outer periphery of the turning apparatus. A pair of left and right chuck levers for holding the cylindrical body from both sides, and a cylinder disposed between the two chuck levers for opening and closing both chuck levers, wherein the holding device is provided so as to be movable in the horizontal direction. And

[0011]

[Operation] According to the above configuration, the cylinder is pinched from both sides by pushing the chuck lever with the cylinder.
The swing of the upper swing body can be fixed at any position. Further, the cylindrical body is continuously fixed to the outer periphery of the turning device, and
Because the holding device is provided so as to be movable in the horizontal direction,
Even if the cylindrical body is locally deformed such as falling down or warping, the upper swing body can be fixed at an arbitrary position of 360 degrees with respect to the lower running body.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments in which the present invention is applied to an excavator will be described below with reference to the drawings.

FIGS. 1 to 5 show a first embodiment of the present invention. In an excavator 1, an upper revolving unit 4 is provided on a lower traveling unit 2 via a revolving unit 3 so as to be pivotable in the horizontal direction. A work attachment 5 such as a leader is provided at the front of the upper rotating body 4.
It has.

A cylindrical body 6 concentric with the turning center of the turning device 3 is fixed to the outer periphery of the turning device 3 of the lower traveling body 2 so as to open upward. On the other hand, a holding device 7 is provided on the lower surface of the upper swing body 4.

The holding device 7 is provided between a pair of left and right chuck levers 9 and 10 rotatably supported by a bracket 8 on the lower surface of the upper revolving unit 4, and is provided between the two chuck levers 9 and 10. It comprises a cylinder 11 for opening and closing the levers 9 and 10, and a spring 12 provided on the upper part of the cylinder 11 for urging both chuck levers 9 and 10 in the releasing direction.

The chuck levers 9 and 10 are connected to the bracket 8
The lower end of the support shaft 13 is slightly pivoted from the intermediate portion to the support shaft 13 inserted in the horizontally elongated hole 8a formed by the rod 11a. The rod 11a of the cylinder 11 disposed above the support shaft 13 extends. The lower end chuck portions 9a and 10a are closed to hold the cylindrical body 6 therebetween.

The chuck portions 9a and 10a are formed in an arc surface conforming to the curvature of the cylindrical body 6 and machined so as to make a curved surface contact with the cylindrical body 6, and have a plurality of vertical grooves on the surface thereof. This is provided as a non-slip for firmly holding the cylindrical body 6. In addition, the uneven shape as a non-slip
Various things can be applied.

The cylinder 11 is a single-acting type. When pressure oil is supplied into the cylinder 11, the rod 11a is extended to overcome the pulling force of the spring 12, and the chuck lever 9,
When the distance between the upper part of the cylinder 10 and the chuck parts 9a and 10a at the lower ends of the chuck levers 9 and 10 is closed with the support shaft 13 as a fulcrum and the hydraulic oil in the cylinder 11 is released to a hydraulic tank (not shown), the spring 12 The gap between the upper portions of the chuck levers 9 and 10 is reduced, and the chuck portions 9a and 10a at the lower ends of the chuck levers 9 and 10 are opened.

The bottom of the cylinder 11 is fixed to the chuck lever 9 with bolts, the tip of the rod 11a is connected to the chuck lever 10 with a pin, and the piston-side end surface of the rod 11a is formed into a spherical shape. When opening and closing cylinders 10 and 10, no tangling occurs.
The bottom side of 1 may be connected to the chuck lever 9 with a pin.

With this configuration, the swing of the upper swing body 4 is determined by the jogging operation of the swing unit 3 by operating from the driver's seat, and the chuck levers 9 and 10 are supplied by supplying pressure oil into the cylinder 11. Since the lower chuck portions 9a and 10a sandwich the cylindrical body 6, the turning of the upper turning body 4 can be firmly fixed at a predetermined position.

The cylindrical body 6 sandwiched between the chuck portions 9a and 10a is provided continuously on the outer periphery of the swivel device 3 of the lower traveling body 2, so that the upper revolving body 4 is moved three times with respect to the lower traveling body 2.
It can be firmly fixed at any position of 60 degrees.

Further, since the cylindrical body 6 on the outer periphery of the turning device 3 is clamped by the clamping device 7, the clamping device 7 can fix the upper revolving unit 4 with a small force, and an impact load on the turning device 3 due to work. This reduces the load on the slewing bearing of the slewing device 3 and the dents and sags on the meshing surfaces of the slewing device drive system gears. In addition, since there is no play at the excavation position due to the cumulative backlash of the swivel drive system gear, an accurate excavation position can be secured, and oblique digging and elliptical holes do not occur, so that the rod is not subjected to an excessive bending moment load.

Thus, the durability of the turning device 3 and the rod is improved. In addition, since an accurate excavation position can be ensured, especially for an excavator or the like performing simultaneous perforation, the arrangement angle of perforated rows can be determined, and thus the effect is large.

Further, the spindle 1 of the chuck levers 9 and 10
Since the long hole 8a of the bracket 8 through which the 3 is inserted is formed to be long in the horizontal direction, it can cope with a wide deformation such as an irregularity of the roundness of the cylindrical body 6, a local fall of the cylindrical body 6, and a warp. Then, since the holding device 7 can move in the horizontal direction, the cylindrical body 6 can be securely held and the turning of the upper turning body 4 can be fixed at an arbitrary position.

Therefore, it is not necessary to require much processing accuracy and mounting accuracy of the cylindrical body 6, so that the cylindrical body 6 itself can be retrofitted in a half-split state, and the holding device 7 itself has a simple component structure. The cost is low.

Moreover, the holding device 7 operates reliably even when mud or the like adheres, and maintenance and inspection are easy.

FIG. 6 shows a second embodiment of the present invention in which the positions of the cylinder 11 and the spring 12 of the holding device 7 are switched up and down, and FIG.
This embodiment shows a third embodiment of the present invention in which the holding device 7 is provided on the lower traveling body 2, and both embodiments have the same operation and effects as those of the first embodiment.

[0028]

As described above, the turning position fixing device for the upper revolving unit of the vertical excavator or the like according to the present invention is provided on the outer periphery of one of the lower traveling unit and the upper revolving unit. A cylindrical body that is concentric with the center is fixed, and a pair of left and right chuck levers that sandwich the cylindrical body are provided on either the upper revolving structure or the lower traveling structure, and both chuck levers are opened and closed. Since the holding device consisting of the cylinder to be moved is provided so as to be movable in the horizontal direction, the cylinder can be held by pushing the chuck lever with the cylinder, and the turning of the upper rotating body can be locked at any position, and The clamping device can move in the horizontal direction in response to wide deformations such as irregularity of the circularity of the cylindrical body, local collapse of the cylindrical body, and warpage. Fix turning at any position It can be.

Therefore, there is no need to demand the processing accuracy and the mounting accuracy of the cylindrical body so much that the cylindrical body itself can be retrofitted in a half-split state, and the holding device itself has a simple component configuration, so that the overall cost is low. Costs.

Further, since the cylindrical body is continuously fixed to the outer periphery of the turning device, the upper revolving unit can be fixed at an arbitrary position of 360 degrees with respect to the lower traveling unit, and the cylindrical body on the outer periphery of the turning device can be fixed. Since the clamping device is clamped by the clamping device, the clamping device can fix the upper revolving structure with a small force, and the impact load on the revolving device due to work is reduced, and the load on the revolving device's revolving bearing and the revolving device drive system gear are reduced. Impressions and sags on the engagement surface are reduced, and the durability of the turning device itself is improved. In addition, since there is no play at the excavation position due to the cumulative backlash of the swivel drive system gear, an accurate excavation position can be secured, and oblique digging and elliptical holes do not occur. Durability is improved. Therefore, particularly for an excavator or the like that performs simultaneous perforation, the arrangement angle of perforated rows can be determined, and the effect is great.

Furthermore, the holding device operates reliably even when mud or the like adheres, and maintenance and inspection are easy.

[Brief description of the drawings]

FIG. 1 is an enlarged side view of a main part of an excavator showing a first embodiment of the present invention.

FIG. 2 is a side view of the excavator.

FIG. 3 is a side view of a bracket that supports the holding device.

FIG. 4 is a plan view of a main part of the excavator.

FIG. 5 is a perspective view of a chuck lever.

FIG. 6 is an enlarged side view of a main part showing a second embodiment of the present invention.

FIG. 7 is a side view of an excavator showing a third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Excavator, 2 ... Lower traveling body, 3 ... Revolving device, 4 ... Upper revolving body, 6 ... Cylindrical body, 7 ... Clamping device, 8 ... Bracket,
8a: long hole of bracket 8, 9, 10: chuck lever, 9a, 10a: chuck portion, 11: cylinder, 12
... Spring, 13 ... Spindle

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E02F 9/12 E21B 7/02

Claims (1)

(57) [Scope of request for utility model registration] An upper revolving unit is provided via a revolving device so as to be revolvable in a horizontal direction with respect to a lower traveling unit, and one of the lower traveling unit and the upper revolving unit is concentric with a revolving center of the revolving unit. In the turning position fixing device of the upper revolving body such as a vertical excavator provided with a clamping device for clamping the braked plate on one of the lower traveling body and the upper revolving body, The brake target plate is formed of a cylindrical body that opens vertically, the cylindrical body is fixed to the outer periphery of the turning device, and the holding device is a pair of left and right chuck levers that hold the cylindrical body from both sides. A cylinder disposed between the chuck levers for opening and closing both chuck levers, wherein the holding device is provided so as to be movable in a horizontal direction, and a turning position of an upper revolving body of a vertical excavator or the like is fixed. apparatus.