DE2622342A1 - HYDRAULICALLY CONTROLLED GRIPPING UNIT - Google Patents

Description

F-ö97 ^ o Genas / France

Hydraulically controllable gripping unit

The invention relates to a hydraulically controllable gripping unit j whose gripping cradles over rods with a Power lifts are connected as it is in DT-OS 2 128 712 Is written. Gripping units of this type are usually used for excavation, where they work as grabs chare, on the other hand also for shoveling or shoveling of materials. The grab shells help out when excavating actuation by the power lift with its edges relatively deep in the ground. For shoveling or shoveling, however, the gripping shells with their edges are negligible flat, essentially parallel to the ground, without doing noticeably deep into the existing pile of material penetrate, as is the case when loose debris is removed from the ground, from a platform, from a Car surface or the like. Must be included. The two excitation processes of the gripping bowls briefly indicated here are therefore very different and require different controls.

In the Aushuo, the two gripping bowls are hinged to the lower ϊοϋ of a liahmens, and their movements are controlled by lateral, inclined cylinders, on the one hand with the gripping trays, on the other hand

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are verounden with the taking. Excavation shovels of this type are described in DT-PS 1 23ö 754 and in Gri-i ^J £> 712 759.

Another version is known from FK-PS 1,339,635. Here the gripping shells are hinged to the lower part of a support body. To control your swivel movements a centrally arranged, vertical power cylinder is provided, which is connected to each gripping bowl by lateral connecting rods.

The gripping trays are included for shoveling material articulated to the lower, movable end of a radial, vertical hydraulic cylinder, and each grab bowl is connected via connecting rods connected to the stationary part of the hydraulic cylinder. Designs of this type are described in the FK-PS 2 o4y 191, in aer DT-PS 1 18y 24ö and in the uö-Pü 1 535 o7B.

^ s are therefore completely different aggregate formations needed. Due to the compulsion to produce different trainings and to keep them in stock, are Not only is the manufacturer heavily burdened, the user also has to keep the various unit designs in stock hold to swap them out as necessary. Such an exchange then requires mostly a time-consuming one, which can only be carried out with the help of a lot of tools and other accessories Conversion, as can be seen in DT-PS 1 169 248 is.

The object of the invention is to overcome these difficulties and To rule out imperfections to a large extent by creating a gripping unit that can be used both for digging and excavation can also be used for shoveling or shoveling, with neither when changing functions Parts of the aggregate dismantled nor additional parts have to be added.

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To solve this problem are a hydraulic controllable gripping unit whose gripping shells over Rods are connected to a centrally vertically arranged power lift, these rods according to the invention designed as variable-length power lifts that can be acted upon on both sides and are used for control purposes the hydraulic fluid either to the central power lift for excavation movements or to the ones arranged on the side of this, with the upper part of the gripping shells articulated Karfthebern or to all of these Power lifts switchable control valves are provided.

Through this controlled different supply of pressure fluid to the middle, which can be acted upon on both sides The power lift or the side power transmitters are not operated with hydraulic fluid loaded power lift locked so that they keep the set length. I'll be the middle one When the power lift is locked, the pivot pins of the grab shells remain on a solid line. To these pivot pins the gripping shells are caused to pivot when the lateral power lifters pressurized fluid is supplied, as in the case of those previously mentioned in the first place on the prior art Scriptures is the case. On the other hand, if the side power lifts are locked, they work as if they were fixed Connecting rods. The pivot pins are created by supplying hydraulic fluid to the central power lift alone the grab shells are raised vertically and thus the grab shells are conventional for shoveling Movement granted.

Are the various power lifts connected to switchable control devices, from which the different power lifters controlling a certain movement process of the gripping trays hydraulic fluid is fed, so needs when crossing from the ditch

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to paddle and vice versa the gripping unit neither retrofitted a nor parts of it to be dismantled, since the functional changes are triggered solely by switching control organs, such as distribution devices and valves and consequently by means such as those in the field of hydraulic control and regulation ehnilc are currently in use.

A gripping unit designed according to the invention is shown in an exemplary embodiment in the drawing ^ is in the drawing

Fig. 1 is a partially sectioned side view in the open Position of the grab shells,

FIG. 2 shows a side view corresponding to FIG. 1 with gripping ducts 5 closed for excavation

3 shows a side view corresponding to FIG. 1 with the gripping shells in the shovel position;

3 shows a plan to illustrate the liquid circuit for controlling the two paddle functions,

In a vertically arranged cylinder 3 of a Jiraftheber 1, a piston rod 2 suspended, for example, on the boom of an earthmoving machine and loadable on both sides, is guided displaceably. Whether gripping shells 5a, 5b are hinged »On their upper side, the gripping knuckles carry pivot pins 7a, 7b to which the piston rods of power lifts Oa ₉ , which are arranged in an inclined position and can be acted upon on both sides, are articulated

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Ends, the linkage about articulation folds 9a, 9b connected to a cross member Io, which extends transversely to the piston rod 2 is freely rotatable ₅ against it, and thus the gripping unit, the piston rod is secured against displacement but longitudinally.

Each gripping bowl carries a quadrant designed toothed segment 11a, 11b, the center of which lies in the pin 6a and 6b, respectively. These segments are located in engagement with each other to ensure precise motion synchronization to ensure the grab shells. The movement of the grab shells for digging is thus controlled by the lateral power lift 8a and 8b and the movements to be carried out when shoveling through the middle Power lift 1 controlled.

The means for controlling the piston rod 2 and the power lifts 8a, 8b are in Pig. 4 illustrates. she consist of the three-way valves 12 and 13, which, as shown schematically at 14, simultaneously by hand can be adjusted, and a distribution valve of known training, via which the inlet of Pressure fluid is controlled to inlet openings 12a and 13a, via a further provided on valve 12 Opening 12b, pressure fluid can be fed to the laterally arranged power lifters 8a and 8b, whereby whose piston rods are ejected. The opening 13b provided in the valve 13 can likewise the power lifts 8a and 8b hydraulic fluid are fed, but with the effect that the piston rods pushed in the opposite direction, so drawn in xverden. These opposing functions are possible because the power lifts can be acted upon on both sides, in a similar "way" is provided in the valve 12 opening 12c pressure fluid fed to the centrally arranged power lift 1 with the effect that the cylinder 2 is pushed upwards. In the case of liquid

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feed line through the opening 13c of the valve 13, the reverse movement can be brought about with the Effect that the piston rod 2 is ejected.

This described positive cycle can also be designed in another known manner. So the distributor valve can also be used as a be designed drenbaren distributor around the piston rod 2 of the power lift 1 around on the ^ uertraverse Io arranged three power lifts 1, 8a and ob Supply hydraulic fluid.

For digging, pressure fluid is supplied from the distributor valve after appropriate adjustment by means of the hand linkage 14 15 to the opening 12a of the valve 12, flows through this and leaves it through the opening 12b towards the power lifts Ba and bb, the piston rods of which are thereby ejected. The ones from the piston rods Liquid displaced in the process makes its way through openings 13b and 13a and via the distributor valve 15 back to the container, not shown, as illustrated by arrows in FIG. The one with the Middle power lift 1 connected valve openings 12c and 13c remain closed. The one so hydraulically locked iLowerhub 1 provides for the two grab shells 5a and 5b represent a solid support.

While the piston rods of the power lifts 8a, 8b are being ejected, the gripping shells 5a, 5b pivot around their pivot pin there, whether up to that shown in FIG Closed position. The edges or cutting edges 16a and 16b of the gripping trays move along the Curves IYes and l? "b and penetrate from the starting position according to Fig. relatively deep into the ground, the upper limit of which

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It is indicated in this case: “The opening of the fire bowls, their flow reversal into the starting position, is achieved in a simple manner by switching the liquid flow circuit by adjusting the distribution valve 1§ .

Shovels are turned off by actuating the mandrel 14, whereby the iifßnmmgeaa 12c., 13ε open and the opening 12b ₃ 13ib are closed. will. Dadiareii be the seiifcli'ßheia iöraffäielier Ba ₃ -Öib iiydratuliseii Trerriegelt and form sanireräiaäert in itorer Läaage lasting ₃ to 2u the ßelenicszapfem Yes _3? B reicnende support rods seiaalen door the Kreif-. olnifcer this ¥ oraiassetzo3ng i-Jird upon actuation of the? erteilerventils 15 liroiEMTüssigkeit on the üifnnMag 12b the upper! eil supplied to the, cylinder 3 ₃ dadiaren this cylinder Naen moved above iiänrend duren the liquid located in the lower part ■ the üffniangen 13ß and 13a of the valve 13 is forced into the container ₃ as shown by the arrows in verainseiaialiieb.t.

the yerseidebiing of the cylinder 3 with respect to the x-piston rod 2 of the power transmitter 1, sow the Sreifselkalen 5a at least 5b from the position shown in Pig, I into the position shown in J ¹ Ig. 3 as in the given position ₃ and this is due to the joint movement of the pegs 6a ₃ 6b and the simultaneous distortion of the gel cones? A ₃ century van. the upper selenium bolts 9a, 5b on a pool ₃ which corresponds to the shortest length of the jirafthber 8a _{3 Bb.}

Mäibreiad follow this movement the Sehneidkianten 16a aasaüi 16b of the © ripe shells 5a and 5b the symmetrical fiar ^ EII have 19a ₃ 19b ₃ erlauf the one parallel to the bottom surface 18 is substantially ₉ bit deeply penetrating ¥ «Bas open the Sreifschalen is dureh adjustment of the

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Distribution valve 15 brought about. By then adjusting fluid circuit is the cylinder 3 of the power lift 1 is pressed down into the position shown in FIG. 1.

If the three power lifts I ₅ 8a are operated simultaneously, there is a function that lies between the excavation and the shovel movement ₃ whereby, according to the invention, an additional advantage XfGr de η can be achieved.

Although the gripping pan control described primarily is intended for trd-motion machines, it can for every type of gripping unit and for treatment very different materials and very different products are used, for example for coal, soil, beets, Wood and the like. The gripping shells can therefore also be designed very differently and represent shovels, jaws, arms, forks and the like.

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Claims (1)

y - Claim Hydraulically controllable gripping unit _s whose gripping trays are via rods with the variable length
Part of a centrally vertically arranged power lift are connected, d adurch ge markz eich net ₃ that the
Rods are designed as variable-length power lifts (8a, 8b) that can be acted upon on both sides, and
to control the hydraulic fluid either to the central power lift (1) for excavation movements or to the power lifts (8a ₃ 8b) for shoveling movements or switchable control valves (12, 13) for all these power lifts. 609849/0327 Blank page