JPH07470Y2 - Crane swivel mounting device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention separates the crane swivel from the vehicle body when traveling on the road due to the limitation of the size of the mobile crane such as a truck crane and especially the load of the automobile and the axle load. It concerns mobile cranes that must be transported.

[Conventional technology]

Conventionally, a flange is provided on the outer periphery of the contact portion between the lower seat ring fixed to the vehicle body and the upper seat ring on the side of the turntable for crane turning mounted on the lower seat ring, and between the upper and lower seat rings,
Crane swivel with taper fittings cooperating with frustoconical annular projections on the lower seat ring so that the radial thickness of the upper seat ring and annular projection is smaller than that of the lower seat ring. A device for mounting a table is disclosed in Japanese Utility Model Laid-Open No. 184882/1982. The clamp mechanism for both upper and lower flanges in the device is the other end of a pair of lock ring elements, one end of which is pin-connected. An annular groove is provided on the inner circumference of the lock ring, which is connected by expansion cylinders, and the lower groove wall of the annular groove is fitted between the vehicle body and the flange of the lower seat ring when the expansion cylinder is reduced. At the same time, the upper surface of the flange of the upper seat ring is pushed down by the sloped surface of the upper groove wall of the annular groove, and both upper and lower flanges are clamped and tightened by the lock ring. The contracting force is mainly due to the wedge action Spent of pinching. It is also known from Japanese Utility Model Laid-Open No. 52-21685 that a key for preventing the rotation of the upper seat ring is attached between the upper and lower seat rings.

Therefore, when the telescopic cylinder is reduced and the upper and lower flanges are relatively pushed into the annular groove of the lock ring, the pushing force is reduced by the frictional force between the upper and lower flanges. It cannot be bent in the radial direction.

[Problems to be solved by the invention]

With the recent increase in construction work, it is desired to dramatically increase the maximum lifting capacity of mobile cranes to 300 to 360 tons. As shown in the figure, the mounting position of the counterweight 11 with respect to the crane swivel base 10 should be offset to the rear of the crane swivel base as much as possible from the turntable 14 mounted on the vehicle body 13 within a range that does not interfere with the vehicle cab 12. Therefore, the diameter of the turntable and each seat ring is significantly increased (the seat ring outer diameter is about 2.5 US in the embodiment of FIG. 9) to increase the weight of the entire crane swivel including the suspended load and Although it is necessary to deal with an increase in rotational inertia, if the conventional technique is applied to this, the rigidity of the lower seat ring and the vehicle body cannot be increased to the left due to the limitation of the axle load of the vehicle.
The roundness of the upper and lower seat rings decreases and the mounting strain when welding the lower seat ring to the vehicle body becomes large.It is not only difficult to correct this strain, but also the taper fitting part bites when removing the crane swivel base. May hinder the removal of the crane swivel.

[Means for solving problems]

The present invention addresses this problem by providing a flange on the outer periphery of the contact portion between the lower seat ring 1 welded to the vehicle body and the upper seat ring 2 on the turntable side for crane rotation mounted on the lower seat ring 1.
1a and 2a are provided, and between the upper and lower seat rings, a loose loose taper fitting portion that cooperates with a frustoconical annular projection 3 provided on the lower seat ring is provided. The protrusion 3 has a radial thickness smaller than that of the lower seat ring, and at least one key 5 for preventing rotation of the upper seat ring is provided between the upper and lower seat rings. A crane truck in which rings are installed so that they can be separated into upper and lower parts. An annular groove 6a is formed in the inner periphery of which the abutting flanges can fit loosely, and the ring groove can be expanded.
The C-shaped lock ring 6 provided with the notches S is slidably supported on a plurality of abutments on the vehicle body so that the annular groove thereof is always opposed to the both flanges, and the height of the lower seat ring 1 is increased. A pair of upper and lower arms, which are thicker than the radial thickness and project tangentially from the outer surfaces on both ends of the C-shaped lock ring 6 over the notches S, respectively. Pair of arms 8
It is provided so as to be fitted between the arms 7 and 8 and the distal end portions of the both arms 7 and 8 are connected by a telescopic cylinder 9 disposed between a pair of upper and lower arms 7. When the telescopic cylinder is reduced, it is C-shaped. The lock ring is expanded so that it can be separated from the both flanges, and when the telescopic cylinder is extended, the outer circumferential surface of both flanges is bent at the inner end of the annular groove 6a so that the upper seat ring or the annular projection 3 is bent. It is characterized in that it is configured so as to substantially eliminate the roundness of the upper and lower seat rings and the difference in mounting strain.

[Action]

According to the above configuration, when the telescopic cylinder 9 is extended from the contracted state and the C-shaped lock ring 6 is tightened as shown in FIGS. 1 and 2, the C-shaped lock ring 6 is mediated by the arms 7 and 8. While the annular groove 6a is engaged with the upper and lower flanges by a large tensile force acting tangentially to the outer sides of both ends, the inner end of the annular groove of the C-shaped lock ring is the outer peripheral surface of the flanges 2a, 1a of the upper and lower seat rings. The upper seat ring 2 and the annular projection 3 are pressed in the entire circumference of the upper end of the upper seat ring 2 in a radial direction to substantially eliminate the difference in roundness between the upper and lower seat rings and the difference in mounting strain on the vehicle body. A large frictional force is generated between the upper and lower seat rings and the C-shaped lock ring. The height of the lower seat ring 1 is made larger than the radial thickness thereof in order to prevent the upper surface of the lower seat ring from being bent in the vertical direction due to the bending of the vehicle body supported by the outriggers, and to bend the annular projection 3 in the radial direction. This is to enable

In this state, the upper and lower seat rings, which are regulated by the inner tapered fitting parts (3, 4) so that their centers match,
Since the relative rotating portion is reliably blocked by the frictional force generated between the key 5 and the pressure contact portion of the C-shaped lock ring, a large rotational inertia is sufficiently exerted on the vehicle body when stopping the rotating crane swivel base. Can be communicated. Also, since there are small gaps (for example, about 0.5 or less) between the upper and lower flanges and the upper and lower groove walls of the annular groove 6a respectively, when the C-shaped lock ring is expanded and tightened, It is possible to cope with fluctuations in groove width and mounting distortion of the upper and lower seat rings, and due to the large load moment during loading and unloading work, the upper seat ring 2 allows the groove width of the annular groove 6a with respect to the lower seat ring 1 Even if it tilts inward, the vertical displacement of the tip of the telescopic boom 15 that is maximally extended is small. For example, in the embodiment shown in FIG. 9, even when the maximum boom length is 50 rice, the vertical displacement of the tip is less than 2 mm, and the rapid tilting of the upper seat ring with respect to the lower seat ring causes the C-shaped lock to be tightened. There is no problem in practice because the ring blocks.

When the telescopic cylinder is contracted from the tightened state of the C-shaped lock ring, the C-shaped lock ring expands symmetrically with respect to the central portion. Therefore, if the expanded C-shaped lock ring is slid with respect to the vehicle body until it is separated from both upper and lower flanges 2a and 1a, the crane swings so that the upper seat ring 2 is separated from the lower seat ring 1 upward. It is possible to lift or lift the platform. The C-shaped rock ring after removing the crane swivel is returned to the state in which the lower seat ring 1 is tightened again, and the C-shaped rock ring is fixed to the vehicle body. Therefore, the radial thickness of the lower seat ring is made larger than that of the upper seat ring.

Conversely, when placing the upper seat ring on the lower seat ring by lowering it substantially vertically, the taper fitting parts (3, 4) start to engage and the upper and lower seat rings are engaged.
When the centers of 2 and 1 are substantially aligned, the upper seat ring can be slightly pivoted so that the key 5 attached to one seat ring engages with the key groove of the other seat ring. Key binding is easy. After the lowering of the upper seat ring is completed,
If the telescopic cylinder 9 is extended, the both ends of the C-shaped lock ring can be attracted and tightened by the large extension force to connect the upper and lower seat rings as shown in FIG.

〔Example〕

FIGS. 1 to 8 show an embodiment of the present invention applied to the truck crane of FIG. 9, which is a turntable of a crane swivel 10 equipped with a multi-stage telescopic boom 15, its delicate cylinder 16, a crane cab 17, and the like. The reference numeral 14 designates an inner ring 19 fixed to the bottom of the crane swivel base 10 with a large number of bolts 18, and an outer ring 23 attached to the inner ring 19 via upper and lower horizontal rollers 20, 22 and a vertical roller 21 in the middle thereof so as to be rotatable only. And the elastic deformation of the upper seat ring 2 tightened by the C-shaped lock ring 6 reduces the adverse effect on the roller rolling surface. The large gear 24 cut outside the outer ring meshes with a plurality of pinions 25 driven by a plurality of hydraulic motors (not shown) mounted on the crane swivel base, and the swing drive force of the crane swivel base 10 is engaged. Is getting bigger.

The upper seat ring 2 is thinner than the outer ring 23 in the radial direction and is provided so as to project downward from the outer ring. The lower end of the upper seat ring and the flange 2a are welded and fixed to the vehicle body 13 and the lower seat ring 1 and the flange 2a. It is placed on the flange 1a. The tapered fitting portion provided between the inner sides of the abutting upper and lower seat rings has an annular projection 3 protruding upward from the inner upper end of the lower seat ring 1 and a truncated cone shape formed on the outer periphery of the annular projection. A tapered hole 4 whose tapered surface fits loosely is formed in the lower inner circumference of the upper seat ring 2. Therefore, since the upper seat ring 2 and the annular projection 3 are thinner in thickness in the radial direction than the lower seat ring 1 and are easily bent, the upper seat ring 1 and the upper seat ring 1 are coupled with the loose fitting of the tapered fitting portion. The taper fitting portion can be easily engaged and disengaged regardless of the difference in roundness and mounting distortion between the two.

The C-shaped lock ring 6 has a circular shape at the tightening position shown in FIGS. 2 and 3 and the expanded position shown in FIG. The base 7a of the arm 7 is welded to the outside of one end of the C-shaped rock ring forming the cutout S, and the base 8a of the arm 8 sandwiching the arm 7 is welded to the outside of the other end. A telescopic cylinder 9 having a remarkably high hydraulic pressure is connected between the tips of 7,8.
Reference numeral 26 is a lock bolt that holds the C-shaped lock ring in the tightened state shown in FIG. 3, and the lock bolt 26 penetrates a bracket 27 fixed to the outer side of the arm 8 mounting side end of the C-shaped lock ring. It is screwed into the tip end plate 7b and fixed by the lock nut 28. Therefore, when the C-shaped lock ring is expanded, the lock bolt is removed.

As shown in FIG. 7, the width B of the annular groove 6a of the C-shaped lock ring is slightly larger than the total thickness T of the abutting upper and lower flanges 2a and 1a, and the C-shaped lock ring 6 is fixed on the vehicle body. It is slidably supported in the horizontal direction by three plate-shaped abutments 29, 30, 31 so that the annular groove faces the upper and lower flanges.

The plate-shaped abutment 29 and the notch S are located on both ends of the diameter line D, respectively, and the central portion of the C-shaped lock ring 6 has the two-sided engagement pieces 35 projecting from the lower surface of the plate-shaped abutment 29. By holding it,
It is slidably guided along the diameter line D. Reference numeral 32 is a hydraulic cylinder for moving the central portion of the C-shaped rock ring back and forth along the diameter line D, and the base end of the hydraulic cylinder 32 is a bracket 33 on the vehicle body.
Connected to. When the hydraulic cylinder 32 is at its minimum contraction, the expanded C-shaped lock ring is located outside the upper and lower flanges 2a, 1a in the radial direction. 34 is a piston rod connecting bracket on the C-shaped lock ring side.

Two to four keys 5 may be attached by equally dividing the outer circumference between the upper and lower seat rings 2,1. However, even if a plurality of keys are provided, only one of them mainly exerts the key action, so that FIG.
As shown in FIG. 6, one wide key 5 is attached to the upper end of the lower seat ring 1 so as to face the center of the C-shaped lock ring 6, and the key groove for engaging and disengaging the key is located on the upper seat ring 2 side. Can also be provided.

This is because the upper and lower seat rings are positioned substantially at the center by the taper fitting portion, and the upper and lower seat rings are integrally tightened by the C-shaped lock ring.

[Effect of device]

 The present invention has the following effects.

(1) By applying a large pulling force by the telescopic cylinder 9 in a tangential manner between both ends of the C-shaped lock ring 6, the C-shaped lock ring extends over the outer peripheral surface of the upper and lower seat rings over substantially the entire circumference. By providing a large tightening force in the radial direction, the upper seat ring and the annular projection, which are easy to bend, in the upper and lower seat rings are bent, so that the circularity difference between the upper and lower seat rings and the attachment to the vehicle body are increased. Since the difference in strain is almost eliminated, the outer diameter of the upper and lower seat rings and the lock ring must be increased without increasing the weight as in the conventional case. Not only can the superior ability be dramatically improved, but the man-hours required to correct the roundness of the machined upper and lower seat rings and the difference in their mounting strains can be significantly reduced.

(2) Further, since the taper fitting portion between the upper and lower seat rings is made loose, and the upper seat ring is not bent inward in the radial direction when the C-shaped lock ring is expanded, There is no risk that the fitting portion will bite due to the weight of the crane swivel and hinder the lifting of the crane swivel when the mounting device is disassembled.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an essential part of one embodiment of the present invention, FIG. 2 is a plan view of a C-shaped lock ring in a tightened state, and FIG. 3 is a cross-sectional plan view of both ends thereof, FIGS. 5 is an enlarged view of the main part of FIG. 1 and its X arrow view, and FIG. 6 is Y- of FIG.
Y sectional view, FIG. 7 is a sectional view of a main part when the C-shaped rock ring is expanded, FIG. 8 is a cross-sectional plan view of both ends of the C-shaped rock ring when expanded, and FIG. 9 is a side surface of the truck crane. It is a figure. 10 …… Crane swivel, 12 …… Car cab, 13 …… Body, 14 …… Turntable, 15 …… Telescopic boom.

Claims (2)

[Scope of utility model registration request] 1. A lower seat ring 1 welded on a vehicle body and an upper seat ring 2 mounted on the lower seat ring 1 on the side of a turntable for turning a crane.
Flanges 1a and 2a are provided on the outer circumferences of the abutment portions with and, respectively, and between the upper and lower seat rings, a loose taper fitting which cooperates with the truncated cone-shaped annular projection 3 provided on the lower seat ring. The upper seat ring 2 and the annular projection 3 are provided such that the radial thickness of the upper seat ring 2 and the annular projection 3 is smaller than that of the lower seat ring, and at least one key 5 that prevents the upper seat ring from rotating is placed on both the upper and lower sides. Between the seat rings, a crane vehicle mounted so that the two seat rings can be separated vertically, the both flanges contacting each other is provided with an annular groove 6a which can be fitted loosely on the inner periphery, and A C-shaped lock ring 6 provided with a single notch S that can be opened is slidably supported on a plurality of abutments on the vehicle body so that its annular groove is always opposed to both flanges, and a lower seat ring is provided. The height of 1 is made larger than its radial thickness, and the C
A pair of upper and lower arms protruding tangentially from the outer side surfaces of both ends of the character-shaped lock ring 6 over the notches S are fitted so that one upper and lower pair of arms 7 is inserted between the other upper and lower pair of arms 8. The front and rear ends of the arms 7 and 8 are connected to each other by a telescopic cylinder 9 disposed between a pair of upper and lower arms 7, and when the telescopic cylinder is contracted, a C-shaped lock ring is inserted from the both flanges. When the telescopic cylinder is extended, the outer circumferential surfaces of the flanges are pressed against the outer peripheral surfaces of the both flanges so that the upper seat ring or the annular projection 3 and the upper projection ring 3 are bent so that the upper and lower portions can be bent. A mounting device for a crane swivel, characterized in that the circularity of the seat ring and the difference in mounting strain are substantially eliminated. 2. A utility model registration claim in which the C-shaped lock ring 6 is formed in a circular shape at a substantially central position between an expanding position when the telescopic cylinder is contracted and a flange tightening position when the telescopic cylinder is extended. Crane swivel mounting device according to claim 1.