JPH04201996A - Turning locking device for construction machine - Google Patents

Abstract

PURPOSE:To set a turning lock easily and positively in an optional turning position and prevent play by providing a turning body with a hydraulic cylinder for making a locking claw bite into a tooth groove, and a guide member receiving reaction generated during turning lock operation. CONSTITUTION:When a lock switch or a lock lever is operated into the 'on' state to switch a hydraulic change-over valve for the feeding of pressure oil to a hydraulic cylinder 13, a locking claw 11 is pushed out, and its tip part is fitted into the tooth groove of an internal tooth gear 10 to obtain the locked state. At this time, the locking claw 11 slides in the guide groove 12a of a guide member 12. At the time of turning lock operation, the tooth groove of the internal tooth gear 10 is not necessarily positioned on the extended line of the locking claw 11, so that locking is not performed because of the contact between the tip of the locking claw 11 and the tooth tip of the internal tooth gear 10, but locking is completed by turning a turning body 1 slightly as it is in the locking operation. At the locked time, turning torque is received by the guide member 12 through a bolt 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a swing lock device for construction machinery such as crawler cranes, truck cranes, hydraulic excavators, and pile drivers.

[Prior Art] Next, a conventional swing lock device for a crawler crane will be described with reference to FIGS. 4 to 6.

As shown in FIG. 4, a revolving body l is mounted on the traveling body 2 via a swing wheel 3 so as to be freely swingable, and a boom 4 is attached to the front part of the revolving body l so that it can be raised and lowered. ing. A hook 5 is suspended from a hoisting lobe extended from a hoisting drum installed on a revolving body l.

As shown in FIG. 5, crawlers 2a are attached to both sides of the truck frame 2b (Illll) constituting the traveling body 2. As shown in FIG. 5 and FIG. A lock boss 8 with a lock 88 is fixed to the plate 6 by welding or the like, or front and back, and left and right, and a lock boss 8 is fixed to the frame bottom plate 7 of the revolving body 1 by operation from the driver's seat when the swing is locked. lock f4
A bottle hole is provided into which a lock bottle 9 is inserted.

When performing a swing operation, the lock pin 9 is separated from the lock groove 88, and when the swing lock is performed, it is dropped into the lock groove 8a and fitted into the lock groove 8a by an operation from the driver's seat.

[Problems to be Solved by the Invention] Such a turning lock device has the following problems.

That is, the position where the rotation lock can be performed is limited by the position of the lock post 8. For this reason, even when it is better to carry out some work (for example, cargo handling, piling, excavation, etc.) with the swing lock engaged.

The direction of the traveling body 2 is restricted due to ground conditions, obstacles, etc.
Rotation lock may not be possible. In addition to the swing lock, a swing brake is usually installed as a means of keeping the swing body 3 in a stopped position. However, since this brake is generally attached to the input shaft of the swing reducer, it prevents gear backlash. The play is large (for example, about twice the play of the swing lock), and the rotating body l cannot be reliably stopped at a fixed position. Further, since it is necessary to easily insert and extract the lock pin 9 into and out of the lock groove 8a, there is a large play between the two. For example, the diameter of lock bin 9 is 50 m.
m, and if the width of the lock groove 8a is about 55 mm, this backlash will be as thick as 501 for a crane with a working radius of 10 m. For example, there is an earth drill.

Earth drills have a Kerry bar rotating device on the front attachment, and the reaction force must be received by turning force, and if there is play at this time, it will not be possible to drill a perfectly circular and vertical hole. (Become.

This invention was made in view of these problems, and an object of the present invention is to provide a swing locking device that can easily and reliably lock the swing at any swing position and that does not have play. shall be.

[Means for Solving the Problems] In order to achieve the above object, the swing locking device of the present invention is provided with a tapered tip portion that approximates the tooth groove of the internal gear of the inner ring fixed on the traveling body. A hydraulic cylinder that moves the lock pawl horizontally in a radial direction from the center of rotation and engages the tooth groove, and a hydraulic cylinder that guides the movement of the lock pawl and engages the lock pawl in the tooth groove during rotation locking. The present invention is characterized in that a guide member that receives a reaction force is attached to the revolving body.

[Function] During turning work, the hydraulic cylinder is set to the shortest position and the lock pawl is separated from the tooth groove of the internal gear in the inner ring. When locking, the hydraulic cylinder is extended and the tip of the lock pawl is released. Fits into the tooth groove of the internal gear.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

An inner ring 3b, which is a component of the swing ring 3, is provided with an internal gear lO, and is fixed to the upper plate 6 of the trunk frame with bolts 16. The outer ring 3a, which is a component of the swing ring 3, is fixed to the frame bottom plate 7 of the swing body 1 with bolts 17, and the fitting surface between the inner ring 3b and the outer ring 3a has a
Balls 18 constituting a rolling bearing. Or a roller is interposed.

The lock pawl 11, which has a tapered tip similar to the tooth groove of the internal gear lO, is inserted into the guide groove +2a of the guide member 12 attached to the frame bottom plate 7 of the revolving body l by bolts 15.
It is inserted so that it can be moved horizontally in the radial direction from the center of rotation. The cross-sectional shape of the guide groove 12a is, for example, U-shaped. The lock pawl 11 is connected by a pin 14 to a piston rod 13a of a finger-type hydraulic cylinder 13 attached to the plywood portion of the guide member 12. The hydraulic cylinder 13 is activated by operating a lock switch or a lock lever from the driver's seat.

1 and 2 show an unlocked state in which the hydraulic cylinder 13 is shortened to its maximum length and the tip of the lock pawl 11 is retracted from the inner peripheral surface of the internal gear IO.

If the driver operates the lock switch or lock lever (not shown) from the driver's seat to "on" and switches the hydraulic switching valve (not shown) to supply pressure oil to the extension side boat of the hydraulic cylinder 13, the piston The lock pawl 11 is pushed out through the opening 13a, and its tip is fitted into the tooth groove of the internal gear IO as shown in FIG. In other words, it becomes locked. At this time, the lock claw 11 is attached to the guide member 12.
slides in the guide groove 12a. When the driver operates the rotation lock, the internal gear 1 does not necessarily appear on the extension of the lock pawl 11.
There are cases where the tooth groove of 0 is not located and the tip of the lock pawl 11 and the tip of the tooth of the internal gear 10 come into contact and the lock is not engaged. Locking is completed by turning. When locked, the guide member 12- receives a turning torque via the port 15.

After locking is completed, even if the supply of pressure oil is stopped due to stopping the engine or the like, the hydraulic cylinder 13 is locked by a check valve (not shown), and the locked state of the lock pawl 11 is ensured.

[Effects of the Invention] According to the invention described above, the rotation lock can be easily applied at almost any position on the circumference, and furthermore,
Since the tapered tips of the jaws and claws are fitted into the tooth grooves of the internal gear of the swivel ring using a hydraulic cylinder, looseness can be eliminated.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention.
The figure shows the cross-sectional front door in the unlocked state, and Figure 2 shows II of Figure 1.
-11 sectional plan view, Fig. 3 is a sectional plan view equivalent to Fig. 2 in the locked state, Fig. 4 is a side view showing an example of the truck crane, Fig. 5 is an enlarged plane taken along V-V of Fig. 4. 6 is an enlarged sectional front view taken along line Vl-Vl in FIG. 5. l...Swivel body, 2... Traveling body, 3... Swivel wheel, 3
a... Outer ring, 3b... Inner ring, 6... Upper plate of truck frame, 7... Frame bottom plate of rotating body, 10.
・Internal gear, 11 ・Lock claw, 12 ・Guiding member, 13 ・Hydraulic cylinder, 14 ・Bin 1: Noni) Fig. 1 6 ・Tokutsuku frame, 7 One side Miyuan Buddha N Frame Tang λ Anti 10・Inner Wisdom Car 11
・mouth・sokuga＼12・・r内舒〃13-draw Fnlnonda 3 ゝ2 Fig. 5 Fig. 6 Fig. 8a 6

Claims (1)

[Claims] 1. An inner ring equipped with an internal gear that meshes with a swing pinion rotated by a swing drive device attached to the swinging structure is fixed on the running structure, an outer ring that is fitted with the inner ring is fixed to the swinging structure, and the inner and outer rings are connected to each other. In a construction machine that has a rolling bearing with balls or rollers interposed in the mating surface of the inner ring, a lock pawl with a tapered tip similar to the tooth groove of an internal gear radiates from the center of rotation. A hydraulic cylinder that is moved horizontally in the direction to engage the tooth groove, and a guide member that guides the movement of the lock pawl and receives a reaction force when the lock pawl is rotated and locked in the tooth groove. A swing lock device characterized in that it is attached to a swing body.