DE1658034A1 - Boom pivoting device - Google Patents

Description

Boom pivoting device

The invention relates to a device for actuation a boom with one on a base frame for pivoting movement mounted around a substantially vertical axis, the Asuleger supporting swivel frame, with a near the vertical axis located stop, with a swivel drive consisting of two hydraulic cylinders, which with are hinged at one end to the base frame and their piston rods are connected at their free end to a pivot member that engages the swivel frame and extends over part of the arc over which the swivel frame pivots; against the stop. The invention is particularly related to an apparatus like them is used for swinging a boom from side to side on rear shovels.

A pivoting device for pivoting the boom from

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side to side is a common part of Rear shovels and other earthmoving equipment, like them for example, in U.S. Patent 2,973,874 are. The present invention is particularly directed to such dispensing devices in which two hydraulic cylinders are used, one each for pivoting of the boom in one of the two directions and where the actuating device is connected to the boom via slewing rings - Swivel frame in one to compensate for the swivel movement Serving manner is connected, as is the case with the device according to the aforementioned US patent. The one in this The mechanism described in the patent has been found to be supreme Proven to be practical and effective.

However, the disadvantages of the known pivoting device are that it is required for the entire pivoting device Space is large, as a result of which the booms are arranged relatively far away from the respective transport vehicle got to. This leads to an unfavorable transport equilibrium. Furthermore, the formation of the cylinder is here with regard to their dimensions and their sealing disadvantageous. The swivel range is also limited; it extends to less than 180 °.

The object of the invention is to address the aforementioned disadvantages remove.

According to the invention to solve this problem for a

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Pivoting device proposed aer above-mentioned type in that two hydraulic actuating cylinders lie in different horizontal planes and the movement direction of the "piston rods during their working stroke in each case opposite rar pivotal movement of the boom is jerichtet. ■

The pivoting device according to the invention thus leads to. a construction in which all the advantages of the device (J according to the aforementioned USA patent and those of a two-cylinder system are retained, while it is possible to accommodate the entire swivel device on a smaller seam with the advantages resulting therefrom, for example _# that the The rear shovel or other earthmoving tool can be arranged closer to its X-carrier, which led to a better rramspöitgieieligevicht the rear shovel or to use stronger cylinders of the same size * because when calculating the * effective working area which is exposed to the hydraulic fluid that actuates the cylinder, the cross-sectional area of the piston rod must be subtracted from the internal cross-sectional area of the cylinder there is no factor between the piston rod diameter and the cylinder bore, as is the case with the subject of the invention

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the piston rod can be made as strong as is practical for its buckling resistance without sacrificing the dimensions of the Cylinder unfavorably to enlarge or its effective To reduce labor for a given size. Furthermore, in the construction according to the invention per cylinder only a liquid-tight packing is required on the flask instead of two seals, namely on the piston rod and the piston. These advantages are the swivel ^ Mechanisms according to the previous state of the art are not given in which some or all of the working strokes of the Cylinder by pulling back the piston rod of the cylinder under the action of hydraulic fluid that rests on the Print side is let in on the opposite side will.

The drawings show exemplary embodiments of the subject matter of the invention in their application to a rear shovel.

1 is a perspective view of a complete vehicle and rear shovel unit; the one pivot device according to the invention owns;

Fig. 2 is an illustration of the pivot mechanism and its associated Partial perspective view, on an enlarged scale;

Fig. 3 shows an enlarged view of the swivel

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mechanism partly in side view, partly in vertical longitudinal section;

Fig. 4 is a top plan view, partially broken away, of the boom moving into one of its outermost lateral Positions is pivoted;

Fig. 5 is a view corresponding to FIG. 4, but the boom is in a 45 to the longitudinal axis of the Vehicle pivot position illustrated; £

6 is a view similar to FIGS. 4 and 5, but showing the boom in a position extending straight backward from the vehicle;

Fig. 7 is a partial horizontal section along the line 7-7 in Fig. 3, showing a modification at which part other than the pivot bushing of the pivot frame forms the stop part;

Fig. 8 is a horizontal section corresponding to the figure and shows a further modification in which the The pivot pin forms the stop part

For the particular embodiments chosen for the purpose of illustrating the subject matter of the invention, reference is first made to FIGS. 1 to 6 of the drawings. A rear shovel or other earthmoving tool 2 of conventional design with a boom 4 is on

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a »frame 6 arranged on the back of a Treckers 8, for example by engaging existing on the frame 6 pin 10 in not shown, of the Tractor made of rearwardly extending slot guides is appropriate. The usual expansion connectors 12 for fixing are arranged on both sides of the frame 6

The boom 4 is mounted on the frame 6 by means of a pivot frame, generally designated 14, which, vie shown, consists of two plates 16, 18 and a swivel bushing 20 welded to these plates. The swivel socket 20 is pivotably arranged on the frame 6 so that it rotates around the vertical axis of a pivot pin can be adjusted. In the exemplary embodiment according to FIGS. 1 to 6, the pivot bushing 20 forms as follows will be described in more detail, the stop part for applying the pivot links. The boom 4 is on the Swivel frame 14 pivotally mounted so that it moves about a horizontal axis formed from a pin.24 and about this axis can be raised and lowered by means of an actuating cylinder 26, the upper end of which connected to the boom and the lower end of which is hinged to the swivel frame 14 via a pin 28.

A plurality of ears 30, 32, 34 and 36 protrude radially from the swivel socket 20, directed opposite to the swivel frame 14 out, each of which has a lowering near its outer end

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have right hole, these holes in the Ausfühi'vUijsbeispiel according to FIGS. 1 to 6 on a common axis parallel to the axis of the pivot pin 22 lie.

On the 'Sestell 6 there are two single-acting swivel cylinders 3c, 40 arranged. These swivel cylinders 3d, 40 agree in their design coincide with one another, but are arranged opposite one another, so that one of the swivel frames 14 in one direction and the other can pivot this frame in the opposite direction. The swivel cylinder 36 consists of a cylinder 42 which is hinged to the frame 6 on its pressure side at 44. Of the Cylinder 42 contains the usual piston 46 and the piston rod protruding from the other end face of the cylinder 48. A corresponding connection 50 is provided for admitting the pressure fluid into the pressure chamber of the cylinder. No pressure fluid is required in the opposite end of the cylinder 42 facing away from the piston pressure surface to be introduced, rather this end is, according to the exemplary embodiments, via a vent connection 52 the outside air in connection. The two swivel cylinders 38, 40 are arranged in such a way that the cylinder 38, as shown in FIG. can be seen, lies in a higher plane than the cylinder 40, so that they do not interfere with one another.

With the outer end of the piston rod 48 is on the

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* Pin 54 connected to one end of a pivot member 56, the * the other end is hinged to the ear 30 via the pin 58. The portion of the pivot member 56 lying between these ends is cut out cylindrically at 60 so that a surface is created against which the outer surface of the pivot bushing rests in the course of certain sections of the pivoting process 20 creates. A. The corresponding pivot member 62 is attached to the outer end of the piston rod by means of the pin 54 hinged and connected to the ear 32 by means of the peg 64 (Pig 3) at its other end. With this construction forms a curses der.Schwenkbuchse 20 the stop, against the pivot members 56, 62 come to rest. This is an expedient execution, but it is not essential, since the stop is also made from other parts of the swing frame or, as will be explained in more detail below, from the »pivot pin can be formed by oneself or the stop can be provided separately and attached to the frame 6.

be good.

• The swivel cylinder 40 and the swivel members connecting it to the swivel socket agree in their construction with the above-described pivot cylinder 38 and its pivot members match. With respect to the swivel cylinder and its swiveling bar they are arranged opposite one another, the pivot cylinder 40 being hinged to the frame 6 at 66, as shown. Its rod is 68 hinged to a pivot member 72 by means of a pin 70,

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which is connected to the ear 34 via a pin 74 at its other end. A lower pivot member 76 corresponding to the pivot member 72 connects the outer pivot member via a pin 78. The end of the piston rod 68 is pivotable with the ear 36. The pivot members 72 and 76 are cut out at 80 in the same way as the pivot member 56 at 60 to form a cylindrical surface for the abutment against part of the pivot sleeve 20. The pivot cylinder 40 is with a connection 82 £ ut the inlet of pressure ™ liquid provided which opens into the pressure chamber, while the other end is connected via a vent pipe 84 with the outside air. The pivot cylinder 40 has a piston (not shown) connected to its piston rod 68. The common axis on which the pivot members are articulated to the pivot frame 14 is on the other side of the axis of the pivot pin 22 from the boom 4, ie from the stern of the tractor as seen, arranged. .

According to Fig. 4, in which the pivot frame 14 is in a its extreme positions - in this figure in the right position - is the piston rod 48 of the swivel cylinder 38 is fully extended and by means of the pivoting members 56, 62 it has the ears 30, 32 in the one shown in FIG Position drawn. With the extension of the piston rod 48 of the swivel cylinder 38 is the piston rod 68 of the swivel cylinder 40 by adjusting the swivel associated therewith. members 72, 76 mechanically returned. In the position

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after Pig. 4 is the piston rod 68 of the pivot cylinder 40 fully retracted, with its pivot members 72 and 76 with their intermediate sections 80, as shown, against a part the pivot bushing 20. In the case of the particular one shown The swing frame has a total swing capacity of about 185 °.

If the swivel frame 14 is now to be swiveled from its extreme position shown in FIG. 4 into its other extreme position towards Iink3, pressure fluid is admitted into the swivel cylinder 40 via the inlet 82, which increases the advance of the piston rod 68 and, as can be seen from FIG. 4, the adjustment of the pin 70 upwards and to the right (in the drawing) causes. The pivot members 72 and 76, the ears 34 and 36, the pivot bushing 20 and pivot frame 14 to pivot all the pivotal members 72 and 76 abutting together as a unit about the axis of the pivot pin 22 against W, the pivot bushing 20th As the pivoting movement progresses, the pivoting frame 14 and the parts assigned to it reach the 45 ° position according to FIG. 5, the pivoting members 72, 76 still resting against the pivoting bushing 20. As the movement continues, the swivel frame 14 reaches the position according to FIG. 6. When the swivel frame moves through this position, the swivel members 72, 76 come out of contact with the swivel bushing 20. With the further swivel movement of the swivel frame 14 to the left over the position after Fig. 6 also remain the

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Pivot members 72 »76 with the pivot bushing 20 out of contact. In the position according to FIG. 5 corresponding but opposite 45 ° division, the pivot members take 72, 76 to the pivot bushing 20, the position of the pivot member 56 according to FIG. The pivot links 72, 76 remain in the further movement to the left in the position according to FIG. 4 corresponding, but opposite to this left extreme position still out of contact with swivel socket 20

A swivel movement in the opposite direction is effected in the same way by actuating the swivel cylinder 38

Due to the fact that the swivel links move against the stop during part of the swiveling process, in the example described against a part of the pivot bushing 20, and that they are in the course the rest of the pivoting process from this stop, f remains the lever arm over which the pivot cylinder on the pivot frame 14 acts, i.e. the distance between the axis of the pivot pin 22 and the axis of the working Piston rod, more evenly over the entire pivoting process, than would be the case if the piston rod were simply connected directly to the ears of the pivot bushing. As the piston moves with the piston rod at a constant speed, both the torque and the

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* the degree of panning or the speed for all ' kept sufficiently uniform for practical purposes.

In the embodiment of FIGS. To 6 described above, the pivot members 56, 62, 72 and 76 all have the equal length and this is equal to the hypotenuse of the right triangle whose sides are equal to the distance between the axis of the pivot pin 22 and the axis of the bores in the ears 30, 32, 34 and 36. This ratio will when viewing Fig. 4 is clear. If - in the figure, the swivel frame 14 is moved slightly upwards, so that if it runs exactly at right angles to the center line of the vehicle, the pivot member 72 coincides with the hypotenuse such a triangle, with the axes of the pins at each end of the pivot link on two of the corners of the triangle and the axis of the pivot pin 22 lies on the third corner of this triangle

In the modification according to FIG. 7, another part of the . Swivel frame 14 as the pivot bushing 20 part of the stop for the contact of the swivel links · Here the swivel link 72 has been replaced by the swivel link 72 *, which, as shown, has such a shape that it does not come into abutment against the pivot bushing 20, and that with a protruding part 73 is provided, which is connected to the pivot member with the piston rod 68 via the pin extends out to a position in which he is

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against part of the outer surface of the plate 18, which 'thus forms the stop part. In this modification, all the other pivot members have the same shape as the pivot member 72 '. This embodiment is the same as the embodiment described above , worked according to Figures 1 to 6.

In the modification of FIG. 8, the stop member is formed from the pivot pin 22 and the Schvenkglied 72 W has been replaced with a pivotal member 72 ', which, as shown, is formed so that it applies itself against the pivot pin 22. To this Equip To make it possible, "the swivel socket 20 ¹ , as shown, is provided directly below the ear 34 with a slot 75 which is of sufficient width in the vertical direction to accommodate the swivel member 72". All other swivel springs in this embodiment have the same shape as the pivoting member 72 ", wherein the pivot bushing 20, etc. respectively with a slot 'is provided to the slot 75 to be able to receive each of the pivot members. This embodiment works in the same way as that according to FIGS. 1 to 6.

The swivel cylinders do not need to be arranged as in the drawing to be. They can be arranged at any suitable or suitable angle, for example on the Center line of the vehicle or, they can be substantially at right angles to this line.

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stretch or be in any position between these two positions, so that the designer in the construction of the swivel device and the frame assigned to it, there is further scope available stands.

The invention is of course not limited to those described and the embodiments shown are limited make changes that are obvious to the intended application, without thereby departing from the scope of the invention.

Patent claims:

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Claims (9)

Claims 1. Vorrich. ur.j for operating a boom with an an a base frame for a pivoting movement around a substantially vertical axis, the boom supporting swing frame, with one close to the vertical Axis located stop, with a swivel drive consisting of two hydraulic cylinders, which with a End hinged to the base frame and their piston rods are connected at their free end to a pivot member which engages the pivot frame and itself in the course of part of the arc over which the Swivel frame swivels, rests against the stop, characterized in that »two hydraulic actuating cylinders (38, 40) in different horizontal planes and the direction of movement of the piston rods (48, 68) on their working stroke is opposite to the pivoting movement of the boom (4) is directed. 009886/0700 BATH 2. Apparatus according to claim 1, characterized in that with the pivot frame (14) on the opposite of the boom (4) On the side of the pivot axis (22) ears (30, 32, 34, 36) are provided at a perpendicular distance from one another, whose bores lie on a common axis lying parallel to the axis of the pivot pin (22), with which the pivot members (56, 62, 72, 76) are articulated. 3. Apparatus according to claim 1 and 2, characterized in that the pivot pin (22) forms the stop against the the pivot members (72 ") put on (Fig. 8). 4. Apparatus according to claim 1 and 2, characterized in that a part (16, 18) of the pivot frame (14) the stop forms against which the pivot members (72 ·) rest (Fig. 7). 5. Device according to one of claims 1 to 4, characterized in that that the swivel frame (14) has a swivel socket (20) which crosses the swivel axis (22) and Parts of the pivot bushing (20) form the stop against which the pivot members (56, 62, 72, 76) rest (Fig. 2-6). ' 6. Device according to one of claims 1 to 5, characterized in that the pivot members are the same length , to have. 009886/0700 BATH 7. Apparatus according to claim 6, characterized in that · The length of the pivot links is equal to the 'hypotenuse of a right triangle, the sides of which are substantially is equal to the distance between the pivot axis and the common axis of the pivot members (Fig. 5) 8. Device according to one of claims 1 to 7, characterized in that that two swivel links are connected to each piston rod. . 9. Device according to one of claims 1 to 8, characterized in that that the hydraulic actuating cylinder (38, 40) each have only one inlet (50, 82) for hydraulic fluid and the one on the other side of the piston (46) located room via a ventilation port each (52, 84) is related to the atmosphere. Hou / Wi - 17 796/97 009886/0700 BATH ORIGINAL "