DE102009057507B3 - Method for controlling scrap shear of e.g. excavator for cutting ships for recycling, involves applying pressure to lifting cylinder during increasing of pressure applied to another lifting cylinder and during closing movement of jaws - Google Patents

Abstract

The method involves applying opening force and closing force to a pivotable lower jaw (16) and a pivotable upper jaw (18) at an angle of incidence by a lifting cylinder (41), where the angle of incidence is different from an angle of incidence of another lifting cylinder (26). Pressure is applied to one of the lifting cylinders attached to the jaws for initiating a closing movement of one of the jaws from an opened position (21). Pressure is applied to the other lifting cylinder during increasing of the pressure applied to the former cylinder and during the closing movement of the jaws. An independent claim is also included for a hydraulic extension device comprising an upper jaw and a lower jaw pivotable around a pivoting axis that is supported at a housing.

Description

The invention relates to a method for controlling a hydraulic attachment for shearing or crushing structures and a hydraulic attachment, in particular for demolition, comminution or recycling, according to the preamble of claim 1 and 6 respectively.

From the DE 600 21 539 T2 An attaching device is known, which is connectable to a boom and to a hydraulic system of a carrier device, such as a skid steer loader or excavator. For this purpose, a connection interface is provided on a housing of the mounting device, on the one hand to fix the housing of the hitch on the boom, in particular interchangeable, and on the other hand to connect the hydraulic system of the carrier device with hydraulic pressure lines or with an inlet and a drain of the hitch. On the housing, a fixed lower jaw or a fixed lower jaw and a pivotally arranged upper jaw or a pivoting upper jaw is provided, wherein the upper jaw is pivotally mounted about a housing arranged on the bearing axis. This pivotable jaw is driven by a single lifting cylinder, so that the jaw can be transferred from an open position by a closing movement in a cutting position and on into a closed position and then by an opening movement back into an open position. In this case, the lifting cylinder, in particular its piston rod, engages the pivotable jaw. Opposite the lifting cylinder is pivotally mounted on the housing, but stationary, stored.

A generic method or a corresponding generic attachment is from the DE 33 32 022 A1 known. This mounting device for shearing or crushing structures comprises an upper and a lower jaw, of which the upper and the lower pivotally mounted on a bearing axis on the housing. At the upper pivotable jaw, a first and a second lifting cylinder engage, which transfer the upper jaw in a common pivot point from an open position to a cutting position or a closed position and back.

Such hydraulic attachments are used to process structures such as scrap. Both iron and non-ferrous metal can be crushed. Such scrap can be in many different forms. For example, these may be ships, rigs or the like. Likewise, it may also be individual metallic components, such as supports, channels, tubes or the like. Furthermore, such attachments can be used for processing structures such as buildings, highways or the like, while a road surface, especially concrete, or other structural parts made of concrete are crushed.

The arrangement of the lifting cylinder and the design of the pivoting jaw and their storage on the housing is such that with increasing closing movement of the pivoting jaw an increasing pressure force can be built, the pressure force is strongest, as soon as a tip of the movable jaw at the same level or slightly positioned opposite a tip of an opposing jaw.

As an alternative to this embodiment of the hydraulic attachment, it is further known that this is designed as a pair of scissors, so that an upper and a lower jaw are each driven to pivot about a common bearing axis on the housing.

Depending on the intended use, the jaws are formed with cutting knives, crushing or crushing teeth or a combination of crushing teeth and cutting blades.

The demands on such hydraulic attachments are steadily increasing. In particular, with constant sizes, increased compressive forces, in particular cutting and / or crushing forces, can be generated. This is based, first, on the fact that for these hydraulic attachments, which have a weight of at least 200 kg even in a small embodiment, the previous size is maintained to allow rapid handling. In addition, larger structures and thicker wall thicknesses of the same size are to be crushed, sheared or crushed. In particular, in the crushing of pipes, the problem arises that they can just be embraced by a mouth opening at a maximum opening position, but the initial cutting force is too low, so that often such pipes can not be cut and a larger attachment is required. In addition, such attachments have the disadvantage that a very low opening and closing speed of the pivoting jaw is given, which is caused by the high return volume between pressure piston surface and piston rod surface of the lifting cylinder. As a result, an increased cycle time of a cutting process is given.

The invention is therefore based on the object to propose a method for controlling a hydraulic hitch and a hydraulic hitch for shearing or crushing structures, in particular for demolition, comminution or recycling, so that at the beginning of a closing movement of at least one pivoting jaw an increased cutting force is achieved and, moreover, shortened cycle times during an opening and closing movement of the at least one pivotable jaw into an opening and cutting and / or closing position are made possible.

This object is achieved by a method according to claim 1, namely for controlling a hydraulic mounting device with an upper and a lower jaw, of which at least one jaw is pivotally mounted on a bearing axis on the housing, wherein the pivotable jaw by a first and at least a further attacking lifting cylinder from an opening in a cutting and / or a closed position and is moved back, wherein the at least one further lifting cylinder engages in a different from the first lifting cylinder angle of attack on the pivoting jaw.

In the first embodiment according to the invention for controlling the at least one pivotable jaw, the lifting cylinders acting on the jaw are simultaneously subjected to pressure. By acting with a different angle of attack on the pivoting jaw lifting cylinder an increased pressure force is already generated at the beginning of a closing movement, so that the sum of the generated compressive forces by acting on the pivoting jaw lifting cylinder already at the beginning of the closing movement is significantly higher than that at the beginning The cited prior art is the case in which the construction device has only a single lifting cylinder.

An alternative embodiment according to the invention for controlling the at least one pivotable jaw provides that initially only one lifting cylinder is pressurized to initiate a closing movement of the at least one pivoting jaw from an opening position and pressure is also applied to the at least one further lifting cylinder. As a result, only one lifting cylinder is acted upon to achieve a fast closing speed and as soon as the application of an increased pressure force is required, which is switched on at least one further lifting cylinder at a low labor force, which only a closing movement without cutting and Zemalmarbeit. Thus, a demand-oriented cutting force increase can be achieved in a preceding closing movement in rapid traverse.

According to a preferred embodiment of the method, only one lifting cylinder for an opening movement of the at least one pivotable jaw, in particular from a closing or cutting position, is pressurized into an opening position with pressure. This allows a simplified control and a shortening of the cycle time by quickly transferring the at least one pivotable jaw to an open position, before the next cutting process is initiated.

Furthermore, it is preferably provided that the lifting cylinder or cylinders acting on the at least one pivotable jaw are actuated for an opening and / or closing movement via at least one valve of a hydraulic control device. By such a valve, a faster travel speed can be achieved.

A further preferred embodiment of the method provides that for a closing movement of the at least one pivotable jaw initially only that lifting cylinder is driven, which has a higher closing speed than the at least one further lifting cylinder in a first closing phase and in a further closing movement, in which a pressure increase takes place, the at least one further lifting cylinder is switched on and controlled, so that at this time the closing movement, an increased cutting force is generated. This arrangement has the advantage that until the actual application of the required cutting force, a rapid feeding or closing movement can take place and at the time when the increased cutting force is required, such is generated.

A further preferred embodiment of the method provides that the at least one further lifting cylinder is controlled during a closing movement of the pivotable jaw as a damping cylinder, which counteracts the at least one, the closing movement performing lifting cylinder. During a cutting process, in particular in the case of a cast material or hardened material, an abrupt break takes place, which causes rapid relief of the at least one controlled lifting cylinder. This can cause seals in the lift cylinder, such as piston seals and piston rod seals, to be damaged. To avoid this, preferably at least one further lifting cylinder is operated as a damping cylinder, which is driven with opposite pressure force to the cutting movement performing lifting cylinder to dampen this sudden discharge and counteract this. This has the advantage that in such sudden discharges resulting damage to the seal of the lifting cylinder can be avoided.

The problem underlying the invention is also achieved by a hydraulic mounting device according to claim 6, namely by a hydraulic attachment for shearing or crushing structures, in particular for the demolition, comminution or recycling, in which at least one pivoting jaw, the one a bearing mounted on a housing bearing axis is pivotally mounted, a first lifting cylinder and a further lifting cylinder engages, wherein the longitudinal axis has a different angle to the longitudinal axis of the first lifting cylinder. This arrangement has the advantage that the at least two lift cylinders acting on the pivotable jaw have different lever arms due to their different angles of attack and thus produce different initial cutting forces, wherein it is provided in particular that an increased cutting force is generated already at the beginning of a closing movement from an opening position. In the further course of the closing movement, due to the different angle of attack, the pressure force of the lifting cylinder acting on the pivoting jaw continuously changes to produce the cutting force, the lifting cylinders acting together in such a way that a consistently high force curve of the cutting force over the entire cutting area, in particular between an open position and a closed position.

The embodiment according to the invention also has the advantage that by the use of at least two lifting cylinders there is a force distribution during the introduction of force into the pivotable jaw.

Thus, compared to a Einzelhubzylinder each lower Einzelhubzylinderkraft be achieved, which acts on the pivoting jaw and the housing. As a result, a better distribution of force in the housing of the hitch and / or in the pivoting jaw can be achieved.

According to a further preferred embodiment of the invention, it is provided that a point of application of the at least one further lifting cylinder is adjacent to that of the first lifting cylinder. This allows in a simple manner the positioning of the at least one further lifting cylinder in a different angle of attack to the first lifting cylinder while maintaining the pivoting movement of the pivoting jaw. In addition, targeted different degrees of closing forces can be achieved over the course of a closing movement of the pivoting jaw, so that the cutting force curve over the cutting area can be designed accordingly.

In particular, it is provided that at the beginning of a closing movement of the at least one pivotable jaw, a cutting force increase is generated. The arrangement of at least two lifting cylinders, which engage with different angles of attack on the pivoting jaw, a cutting force increase at the beginning of a closing movement of the pivoting jaw is achieved by up to 50%, for example.

An alternative preferred embodiment of the invention provides that a point of application of the at least one further lifting cylinder is located in the point of application of the first lifting cylinder. As a result, usually the angle of attack of the lifting cylinder can be increased to each other and a central force on the jaw can be achieved.

A further preferred embodiment of the invention provides that the first and at least one further lifting cylinder are supported or counter-supported on the housing. This can be given a simple structural design. This usually also means that lifting cylinders are used with different lengths, which can be used by controlling the pivoting movement by at least two lifting cylinders generally smaller lifting cylinder than is the case in the prior art. The use of smaller lifting cylinders has the advantage that they have a larger stroke with the same installation length, as they have a smaller dead size. The dead size of a lifting cylinder is determined by the difference between the total length of the lifting cylinder and its stroke length. In addition, the use of smaller lifting cylinders has the advantage that a higher operating speed is possible and that in addition there is a smaller inertia.

Furthermore, it is preferably provided that the first and at least one further lifting cylinder engage with the respective piston rods on the pivotable jaw. This allows a space-optimized use can be achieved. Alternatively, it can also be provided that the housing of the lifting cylinder is arranged on the pivotable jaw. In special cases, the lifting cylinder can also be oriented in opposite directions.

In a further preferred embodiment of the hydraulic mounting device, the first lifting cylinder at an opening position of the pivotable jaw on a larger lever arm than the at least one further lifting cylinder. By arranging at least one further lifting cylinder, the first lifting cylinder can be arranged in a more favorable lever arm ratio than this when using only a single lifting cylinder is the case. As a result, and by the addition of at least one further lifting cylinder, an increased cutting force is achieved, in particular at the beginning of the cutting movement, at least at the beginning of the closing movement of the at least one jaw.

A further preferred embodiment of the invention provides that the lifting cylinder acting on the pivotable jaw can be acted upon in parallel with pressure. In this case, in particular a hydraulic control device is used, from which a piston-side and a piston rod-side connecting line are guided to the respective lifting cylinder. By the parallel loading of the attacking on the pivoting jaw lifting cylinder requires no additional control effort. The controlled lifting cylinder hinder each other during a closing movement or an opening movement of the at least one pivotable jaw each other.

Furthermore, it is preferably provided that the sum of the cylinder volumes of the lifting cylinders, which act on the pivotable jaw, is less than or equal to the hydraulic delivery volume of the hydraulic system. As a result, a maximum pressurization of the lifting cylinder acting on the pivotable jaw can be ensured. At the same time increased opening and closing movements of the at least one pivoting jaw can be achieved.

Furthermore, it is provided that the lift cylinders acting on the pivotable jaw have different piston diameters. This allows a high degree of flexibility in the design of the cutting force curve and to control the opening and closing movement of the at least one jaw can be achieved.

The invention and further advantageous embodiments and developments thereof are described in more detail below with reference to the examples shown in the drawings and explained. Show it:

1a and b is a schematic side view of a hydraulic mounting device with a pivoting jaw in an opening and a closing position according to the prior art,

2a a schematic side view of a hydraulic attachment device according to the invention with a pivoting jaw in an open position,

2 B a schematic side view of the hitch according to 2a with a pivoting jaw in a cutting position,

2c a schematic side view of the hitch according to 2a in a closed position and

3 a schematic diagram of a hydraulic control device of the hitch.

In the 1a and 1b is a hydraulic attachment 11 shown, which from the DE 600 21 539 T2 is known. Full reference is made to this document. The hydraulic attachment 11 includes a housing 12 with a connection interface 14 about which this hydraulic attachment 11 on a non-illustrated boom and a hydraulic system of a carrier device, not shown, for example, a skid steer loader or excavator, connectable and easily replaceable. The housing 12 includes a fixed lower jaw 16 or a fixed lower jaw and a pivoting upper jaw 18 or a pivoting upper jaw. The upper cheek 18 is about a bearing axis 19 pivotable, the bearing axis 19 stationary on the housing 12 is provided. As an alternative to this described embodiment, the lower jaw can also 16 in analogy to the upper jaw 18 pivotable about the bearing axis 19 be movable.

The upper and lower cheeks 18 . 16 are with a cutting tool 20 fitted. By such a hitch 11 In particular, the cutting of iron and non-ferrous metals allows and thus be used for recycling. Alternative to the cutting tool 20 The upper and lower cheeks may also be provided exclusively with Zermalmzähnen or additionally with Zermalmzähnen.

For controlling the upper jaw 18 from an in 1a illustrated opening position 21 in a cutting position 22 according to 1b or a closed position of the upper jaw 18 to the lower cheek 16 like this example in 2c is shown, is a hydraulic lift cylinder 26 pressurized, this hydraulic lifting cylinder 26 via a hydraulic control device 28 is controlled. This control device 28 comes with a feed 29 supplied by the hydraulic system. The hydraulic fluid is drained 30 starting from the control device 28 returned to the hydraulic system.

At the beginning of a closing movement of the upper jaw 18 or to initiate a cutting phase of the hydraulic lifting cylinder 26 pressurized, leaving a piston rod 32 along a longitudinal axis 33 the lifting cylinder 26 is extended. Due to the swiveling arrangement of the upper jaw 18 around the bearing axis 19 results in a lever arm 31 , which at the beginning of the cutting hare is substantially smaller than the lever arm 31 in 1b in which the upper cheek 18 in a cutting position 22 was transferred.

In this embodiment according to the prior art, the lever arm 31 in this cutting position largest, so that the compressive force acting in the longitudinal axis 33 lies, a maximum leverage is generated.

The structural design of the hydraulic attachment 11 according to the 1a and b is in the embodiment of the invention the hitch 11 in the 2a retained to c. The same applies to an alternative embodiment, not shown, in which the lower jaw 16 pivotable about the bearing axis 19 is stored so that both jaws 16 and 18 as scissors are pivoting or the upper jaw 18 fixed and the lower jaw 16 is movable.

The in the 2a to c illustrated embodiment of the hitch 11 has a mouth opening 37 on which cutting tips 38 and shear strips 39 include. This attachment 11 is designed as scrap shears for scrapping. Alternatively, as well as the hitch 11 according to the prior art, a combination of cutting tools 20 and crushing tool or at the mouth opening 37 also be provided only a Zermalmwerkzeug. The Zermalmwerkzeug includes, for example, Zermalmzähne.

In a first embodiment of the attachment according to the invention 11 is provided that the upper jaw 18 through a first lifting cylinder 26 and by at least one further lifting cylinder 41 is pressed. The lifting cylinder 41 For example, it engages with its piston rod 42 at a neighboring point of attack 43 to the point of attack 45 on the cheek 18 on which the piston rod 32 the lifting cylinder 26 is arranged. A longitudinal axis 47 the lifting cylinder 41 is in a different angle of attack 49 to the longitudinal axis 33 the lifting cylinder 26 arranged. This results in one of the lever arm 34 of the first lifting cylinder 26 deviating lever arm 48 for the lifting cylinder 41 related to the bearing axis 19 , The angle of attack of the lifting cylinder 26 . 41 to the cheek 18 is determined by the orientation of the longitudinal axis 47 the lifting cylinder 41 or a point of attack 44 the lifting cylinder 41 on the housing 12 on the one hand and the point of attack 43 on the swivel jaw 18 or upper jaw 18 on the other hand. The same applies to reciprocating pistons 26 , The length of the effective lever arm 48 is determined by the angle of attack 49 the lifting cylinder 26 . 41 and the distance of the attack points 43 . 45 to the bearing axis 19 established. This allows a simple design and determination of an initial cutting force and a cutting force curve over the entire closing movement.

Due to the use of, for example, two lifting cylinders 26 . 41 can each of the two lifting cylinders 26 . 41 smaller than the Einzelhubzylinder used in the prior art are formed. This has the advantage that a larger selection of lifting cylinders is available. In addition, this arrangement has the advantage that a better force distribution when introducing the cutting force in the upper jaw 18 due to the separate attack points 43 and 45 on the one hand and the separate support points of the lifting cylinder 26 . 41 on the housing 12 given is. By the arrangement of, for example, two lifting cylinders 26 . 41 can with the same volume of hydraulic fluid for controlling the hydraulic cylinder 26 . 41 a greater cutting force at the beginning of the cutting movement from the open position 21 be achieved because the sum of the lever arms 34 . 48 or these vectors according to 2a greater than the lever arm 31 according to 1a in the prior art. As a result, for example, a doubling of the cutting force at the beginning of the cutting process can be achieved. In particular, this is advantageous when cutting tubes which have a diameter that substantially corresponds to a jaw opening width. Thus, in such applications already applied at the beginning of an increased cutting force and cut such pipes.

After initiation of the cutting motion, the upper jaw becomes 18 in a cutting position 22 convicted like this in 2 B is shown. This cutting position 22 is reached when the cutting tips 28 opposite each other or a cutting tip 28 the upper cheek 18 into the cutting tip 28 the lower cheek 16 dips. In 2c has the upper cheek 18 the closed position 23 ingested.

Alternatively to the illustrated attachment 11 in the 2a to 2c can also be a third lifting cylinder or other lifting cylinder on the upper jaw 18 attack. The more lifting cylinders on the upper jaw 18 attack, the lower the angle of attack of the individual lifting cylinder to each other. On the other hand, it rises to the pivoting jaw 18 acting pressure force.

Under the case 12 is understood both a closed housing, as in the 2a to 2c is shown, as well as an open housing, which may be formed, for example in the form of a support frame or a support frame.

In 3 schematically is a hydraulic diagram of the control device 28 for controlling the two lifting cylinders 26 . 41 the hitch 11 according to the 2a to c shown. About the inlet 29 becomes the controller 28 supplied with hydraulic fluid to initiate a pivoting movement. From the control device 28 leads to each lifting cylinder 26 . 41 a piston-side connecting line 51 , Likewise is between the reciprocating piston 26 . 41 and the controller 28 a piston rod side connection line 52 arranged. The on the swivel jaw 18 attacking lifting cylinder 26 . 41 are connected in parallel. The swivel jaw 18 , which around the bearing axis 19 is controlled pivotally, is in 3 only symbolically represented. The control device 28 includes at least one valve not shown in detail. In addition, other valves for controlling the lifting cylinder 26 . 41 individually or jointly provided, which can be selectively controlled.

By the control device 28 is a flexible control of the lifting cylinder 26 . 41 possible. For example, according to a first embodiment, the at least two lifting cylinders 26 . 41 be pressurized simultaneously. Due to the fact that these are connected in parallel, they do not interfere. In addition, a valve can be switched on until a pressure force increase takes place or the cutting process begins. Subsequently, the valve is closed to further control the cutting process. During the opening movement of the swiveling jaw 18 at an opening position 21 can, for example, only one of the two lifting cylinders 26 . 41 be pressurized. In addition, a rapid traverse valve can be switched on to achieve short cycle times.

Furthermore, it can be provided for the activation of a closing movement that initially the hydraulic cylinder 26 or the hydraulic cylinder 41 with pressure, in particular via at least one valve, is applied until a cutting force increase is felt, so that then the other lifting cylinder 26 . 41 is switched on to apply the increased cutting force. This has the advantage that previously a fast closing movement is possible. The opening movement is preferred only with a lifting cylinder 26 or 41 , in particular via one or more valves, driven to a fast opening time or return of the upper jaw 18 in an open position 21 to enable.

The same applies in embodiments, the two or more lifting cylinder for controlling the pivoting jaw 18 include.

Claims (14)

Method for controlling a hydraulic attachment ( 11 ) for shearing or crushing structures, in particular for demolition, comminution or recycling, which comprise an upper and a lower jaw ( 18 . 16 ), of which at least one pivotally mounted on a bearing axis ( 19 ) on the housing ( 12 ) and by a first lifting cylinder ( 26 ) and at least one further lifting cylinder acting on it ( 41 ) from an open position ( 21 ) in a cutting position ( 22 ) or a closed position ( 23 ) and is moved back movable, characterized in that - an opening and closing force of the at least one further lifting cylinder ( 41 ) in one of the first lifting cylinder ( 26 ) different angles of attack ( 49 ) to the pivoting jaw ( 16 . 18 ) and - that the at least two on the pivoting jaw ( 16 . 18 ) attacking lifting cylinder ( 26 . 41 ) for initiating a closing movement of the at least one pivotable jaw ( 16 . 18 ) from an open position ( 21 ) are pressurized simultaneously or - that initially only one lifting cylinder ( 26 . 41 ) is pressurized and at a pressure force increase during the closing movement of the at least one further lifting cylinder ( 41 . 26 ) is also pressurized. Method according to claim 1, characterized in that only one lifting cylinder ( 26 . 41 ) for an opening movement of the at least one pivotable jaw ( 16 . 18 ) in an open position ( 21 ) is pressurized. Method according to claim 1 or 2, characterized in that the lifting cylinder or cylinders ( 26 . 41 ) for an opening movement or closing movement of the at least one pivotable jaw ( 16 . 18 ) via at least one valve of a hydraulic control ( 28 ) is or will be controlled. Method according to one of the preceding claims, characterized in that for a closing movement of the at least one pivotable jaw ( 16 . 18 ) initially only one lifting cylinder ( 26 . 41 ) is controlled, which in a first closing phase, a higher closing speed than the at least one further lifting cylinder ( 26 . 41 ) and in a further closing movement, in which a pressure force increase takes place, the at least one further lifting cylinder ( 26 . 41 ) is switched on and controlled, so that at this time the closing movement, an increased closing force is generated. Method according to one of the preceding claims, characterized in that the at least one further lifting cylinder ( 41 ) during a closing movement of the at least one pivotable jaw ( 16 . 18 ) is controlled as a damping cylinder, the at least one the closing movement performing lifting cylinder ( 26 ) counteracts. Hydraulic attachment for shearing or crushing structures, in particular for demolition, comminution or recycling, - which is connectable to a boom and to a hydraulic system of a carrier device, - with a housing ( 12 ) and with a connection interface ( 14 ), - with an upper jaw ( 18 ) and a lower jaw ( 16 ), wherein at least one of the two jaws ( 16 . 18 ) pivotable about one on the housing ( 12 ) mounted bearing axis ( 19 ) is arranged, and - with a first, on the pivoting jaw ( 16 . 18 ) attacking lifting cylinder ( 26 ), which at its opposite end to the housing ( 12 ) is supported, and - with at least one other on the pivoting jaw ( 16 . 18 ) attacking lifting cylinder ( 41 ), characterized in that the longitudinal axis ( 47 ) of the at least one further lifting cylinder ( 41 ) in a direction to the longitudinal axis ( 33 ) of the first lift cylinder ( 26 ) deviating angle of attack ( 49 ) is arranged. Mounting device according to claim 6, characterized in that a point of application ( 43 ) of the at least one further lifting cylinder ( 41 ) on the pivoting jaw ( 16 . 18 ) adjacent to a point of attack ( 45 ) of the first lift cylinder ( 26 ) on the same cheek ( 16 . 18 ) lies. Mounting device according to claim 6, characterized in that a point of application ( 43 ) of the at least one further lifting cylinder ( 41 ) in a point of attack ( 45 ) of the first lift cylinder ( 26 ) lies. Mounting device according to claim 6 to 8, characterized in that the first and at least one further lifting cylinder ( 41 ) on the housing ( 12 ). Mounting device according to one of claims 6 to 9, characterized in that the first and at least one further lifting cylinder ( 26 . 41 ) with the respective piston rods ( 32 . 42 ) on the pivoting jaw ( 16 . 18 ) or on the housing ( 12 attack). Mounting device according to one of claims 6 to 10, characterized in that the angle of attack ( 49 ) of the first lift cylinder ( 26 ) in an open position ( 21 ) of the pivoting jaw ( 18 ) a larger lever arm ( 43 ) as a lever arm ( 48 ) of the at least one further lifting cylinder ( 41 ) having. Mounting device according to one of claims 6 to 11, characterized in that on the pivoting jaw ( 18 ) attacking lifting cylinder ( 26 . 41 ) can be acted upon in parallel with pressure and preferably between a hydraulic control device ( 28 ) and the first and at least one further lifting cylinder ( 26 . 41 ) in each case a piston-side connection line ( 51 ) and a piston rod side connecting line ( 52 ) is provided. Mounting device according to claim 6 to 12, characterized in that the sum of the cylinder volume of the lifting cylinder ( 26 . 41 ), which on the pivoting jaw ( 16 . 18 ), less than or equal to the maximum displacement of the hydraulic system. Mounting device according to one of claims 6 to 13, characterized in that on the pivoting jaw ( 16 . 18 ) attacking lifting cylinder ( 26 . 41 ) have different piston diameters.

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