EP4202123A1 - Slipform paver - Google Patents

Abstract

The road construction machine according to the invention, in particular a slipform paver or curing machine for freshly made concrete layers, has a machine frame 1 carried by running gears 3A, 3B, 4A, 4B, on which a working device 11 is provided, which is a working device 18 that can be moved in a direction transverse to the working direction I has, which is attached to a carriage 13, which is guided on a transverse to the working direction linear guide 12. The carriage 13 is connected to a cable 15 that is deflected on one longitudinal side of the machine frame, the free ends of which are attached to the cable drum 19 of a cable winch 16 on the other longitudinal side of the machine frame, so that the carriage can be moved in the transverse direction by rotating the cable drum. The road construction machine is characterized in that the cable drum 19 has a first and a second drum half 20, 21, one end of the cable 15 being attached to one drum half 20 and the other end of the cable to the other drum half 21. The cable winch 16 can assume a first operating mode in which the first and second drum halves 20, 21 are connected to one another in such a way that the carriage 13 is moved by rotating the first and/or second drum half. The cable winch 16 can assume a second operating mode in which the first and second drum halves 20, 21 can be rotated in opposite directions at least in one direction of rotation, so that the cable tension can be adjusted by rotating one drum half relative to the other drum half.

Description

The invention relates to a road construction machine, in particular a slipform paver or a curing machine for freshly made concrete layers, with a machine frame supported by running gear and on which a working device is provided.

Road construction machines include slipform pavers, which have a slipform for placing concrete. The well-known slipform pavers allow particularly economical concrete paving. The concrete to be placed is placed in front of the slipform paver in the working direction. In order to distribute the concrete evenly over the entire paving width, the slipform paver has a distributor device which is arranged in front of the slipform in the working direction.

Slipform pavers are known whose distribution device has a slide that can be moved transversely to the working direction and with which the concrete can be distributed in the transverse direction. The slide, which is also referred to as a distributor sword, is attached to a carriage which is guided on a linear guide running transversely to the working direction.

To move the carriage, traction cables attached to the sides of the carriage can be provided, which can be wound up or unwound by means of cable winches provided on the longitudinal sides of the slipform paver, so that the carriage with the distributor sword can be moved in the transverse direction. In an alternative embodiment, the carriage can be connected to a cable that is deflected on one longitudinal side of the slipform paver, the free ends of which are attached to the cable drum of a cable winch on the other longitudinal side of the machine frame, so that the carriage can be moved in the transverse direction by rotating the cable drum.

In order to create a particularly smooth concrete surface, the slipform pavers can also have a smoothing device that is arranged behind the slipform in the working direction. Slipform pavers are known whose smoothing device has a smoother which is attached to a carriage which is guided on a linear guide running in the transverse direction. To move the carriage, two traction cables can again be provided, which are wound up and unwound by means of cable winches. Alternatively, only one cable winch can be provided, with the cable being deflected on one side of the slipform paver.

The known post-treatment machines used for the post-treatment of freshly made concrete layers can also have such a working device with a working device that can be moved in the transverse direction. In the case of the curing machines, the working device can be a texturing device for texturing the freshly manufactured concrete and the working device can be a brush element that can be moved in a direction running transversely to the working direction. However, the working device can also be a spraying device for spraying the freshly manufactured concrete with a liquid, the working device being a spray head that can be moved in the transverse direction for applying the liquid.

Road construction machines are known which allow different working widths to be set variably. The machine frame of these road construction machines has telescoping frame parts and/or the machine frame is designed in such a way that frame parts can be inserted into or removed from the existing machine frame to increase the working width.

A slipform paver with a variable working width, which has a distributor device as the working device, the working device (distributing blade) of which is moved in the transverse direction by means of two cables, which are connected to cable winches on both sides of the machine frame and pulled down. be settled is from the EP 1 068 397 B1 known. An aftertreatment machine with a working device, which has a spray head as a working device, is from EP 2 886 717 A1 known.

In road construction machines that have a working device of the type described above, the problem arises of setting and maintaining the cable tension required for the proper operation of the working device. Practice has shown that the cable tension can decrease if the construction machine is not in operation for a long period of time. However, the rope tension can also decrease overnight, for example as a result of temperature changes, so that the rope has to be retensioned the next day. In addition, when the working width of the road construction machine is changed, the problem arises that the free length of the cable has to be adjusted, for which purpose the cable has to be wound up or unwound on the cable drum and the cable tension has to be adjusted again.

In the case of road construction machines that have two cable winches, the working width can be changed and the cable tension adjusted by operating the cable winches with which the cables are wound or unwound. The disadvantage, however, is that two separate cable winches are required for this embodiment. In an embodiment with only one cable winch, a cable clamp can be provided on the carriage to release the cable. A disadvantage, however, is the relatively large force that is required for manual tensioning of the rope. Tensioning the rope also proves to be relatively time-consuming. In addition, releasing the rope clamp and tightening the rope requires work in a hazardous area immediately in front of the road construction machine.

The object of the invention is to create a road construction machine, in particular a slipform paver or a curing machine for freshly made concrete layers, which has a working device of the type described above, in which the tensioning of the rope is easier, faster and safer.

This object is achieved according to the invention with the features of the independent patent claims. The dependent claims relate to preferred embodiments of the invention.

The road construction machine according to the invention, in particular a slipform paver or curing machine for freshly made concrete layers, has a machine frame supported by running gears, on which a working device is provided which has a working device that can be moved in a direction running transversely to the working direction, which is fastened to a carriage which is attached to a linear guide running transversely to the working direction. The carriage is connected to a cable that is deflected on one longitudinal side of the machine frame, the free ends of which are attached to the cable drum of a cable winch on the other longitudinal side of the machine frame in such a way that the carriage can be moved in the transverse direction by rotating the cable drum. A linear guide means all components that allow the carriage to be guided in the transverse direction, for example guide rods, profile rail systems, tongue and groove systems, etc. A carriage means all components that are guided in the transverse direction. The carriage can be gliding or guided with rollers.

The road construction machine according to the invention is characterized in that the rope drum has a first and a second drum half, one end of the rope being fastened to one drum half and the other end of the rope being fastened to the other drum half. In this context, “a” rope is also understood to mean a rope that is composed of several ropes or rope pieces that are connected to one another in such a way that tensile forces can be transmitted. For example, the free ends of two pieces of cable can be connected to one another by being attached to the carriage so that they form a cable.

The cable winch is designed in such a way that the cable winch can assume a first operating mode in which the first and second halves of the drum are connected or coupled to one another in such a way that rotating the first and/or second halves of the drum in one direction or the other causes the carriage to move in one direction or other direction is proceeded. The first operating mode corresponds to normal operation, in which the carriage with the implement is moved in the transverse direction. In this mode of operation, the connection of the first and second drum halves need not be rigid. The decisive factor is that the connection allows the necessary torque to be transmitted from one drum half to the other in order to be able to move the carriage to the left or right under load during operation of the road construction machine if the drive is only on one of the two drum halves. The respective half of the drum can be driven by means of a hydraulic, pneumatic or electromotive drive unit.

The cable winch is also designed in such a way that it can assume a second operating mode, in which the first and second drum halves can be rotated in opposite directions at least in one direction of rotation, so that the cable tension of the cable can be adjusted by a relative rotational movement of one drum half in relation to the other drum half. To rotate one half of the drum relative to the other half of the drum, one of the two halves of the drum can be held in place while the other half of the drum is rotated. Each half of the drum can be driven hydraulically, pneumatically or by an electric motor. The drive unit for the second operating mode can be the drive unit for the first operating mode. However, separate drive units can also be provided.

Consequently, in the first operating mode, the two halves of the drum form a “single cable drum” with which the cable can be wound up or unwound without changing the free cable length. In the second operating mode, however, the two halves of the drum form "two cable drums" so that the free cable length can be changed. The two halves of the drum can therefore also be used as two separate cable drums are understood, which are coupled to one another or decoupled from one another, ie can be separated from one another.

One embodiment of the cable winch provides that the first half of the drum has at least one first connecting element and the second half of the drum has at least one second connecting element, with the at least one first and second connecting element being designed in such a way that in the first operating mode a non-positive connection between the first and second Connecting element is produced. The connecting elements can be clutch discs, for example, which allow a non-positive connection in order to be able to transmit the torque required to move the carriage. The non-positive connection can be released in that at least one of the two halves of the drum is moved in the axial direction, so that the clutch disks are arranged at a distance from one another. A suitable adjustment mechanism can be provided for this purpose. This adjusting mechanism can have an adjusting screw, for example. The drum halves can also be adjusted, for example, with a piston/cylinder arrangement. However, the clutch discs can also be designed in such a way that they act as slip clutches, but the transmittable torque is still so great that the carriage can be moved in the first operating mode and the drum halves can be rotated in opposite directions in the second operating mode. In this case, an adjustment mechanism is not required. The connecting elements can be an integral part of the drum halves or form separate components.

An alternative embodiment provides that the first half of the drum has at least one first connecting element and the second half of the drum has at least one second connecting element, wherein the at least one first and second connecting element are designed in such a way that in the first operating mode there is a positive connection between the first and second connecting element will be produced. The fasteners can for example, have claws or external or internal teeth that are engaged in the first operating mode and disengaged in the second operating mode. In this embodiment, an adjusting mechanism for axially moving the drum halves can be provided for releasing the connecting elements.

A particularly preferred embodiment provides that the cable winch is designed in such a way that the first and second cable drums form a coupling that acts only in one direction of rotation, so that the first half of the drum and the second half of the drum can only be rotated in one direction of rotation. This direction of rotation is preferably the direction of rotation in which one half of the drum must be rotated when the other drum is held in place in order to tension the cable.

In the most preferred embodiment, the first half of the drum may include at least one ratchet and the second half of the drum may include at least one spring biased pawl, the at least one ratchet blade being snapably engaged with the at least one ratchet. The two halves of the drum can be twisted against each other to tension the rope, with the locking effect in one direction of rotation facilitating tensioning because the rope system remains under the set pretension. The required torque can be easily transmitted in one direction of rotation. Torque transmission in the other direction of rotation, ie counter to the locking effect, can be made possible by rigidly connecting the two halves of the drum to one another. The rigid connection can be made, for example, with a screw or a bolt or other locking elements that can be actuated electromagnetically, hydraulically or pneumatically. However, locking is not necessary if the freewheel is designed such that, for example, the spring preload of the pawl is dimensioned such that the two halves of the drum are still held together in the other direction of rotation to such an extent that the required torque is transmitted.

The first drum half may have a plurality of ratchets circumferentially spaced around an axis of rotation of one of the two drum halves at predetermined intervals, and the other of the two drum halves may have a plurality of pawls spaced circumferentially around a rotational axis of the drum half at predetermined intervals are arranged. This makes it possible to connect one half of the drum to the other half of the drum in different intermediate positions. A particularly large number of intermediate positions can be achieved in that the predetermined distances at which the locking pieces of one of the two drum halves are arranged and the predetermined distances at which the pawls of the other of the two drum halves are arranged overlap in the manner of a vernier are matched.

In order to completely separate the first half of the drum and the second half of the drum, the two halves of the drum can, in the particularly preferred embodiment, be switched between a first position, in which the at least one pawl engages in the at least one locking piece, and a second position, in which the at least one pawl is not in which engages at least one locking piece, be axially displaceable in relation to one another. If both halves of the drum are completely separated from each other, the cable can be wound up or unwound from one or both cable drums if the working width is increased or decreased. A suitable adjustment mechanism can be provided for the axial displacement of the drum halves. This adjusting mechanism can have an adjusting screw, for example. However, the drum halves can also be adjusted, for example, with a piston/cylinder arrangement.

For tensioning or for winding or unwinding the rope, only a relative movement of the drum halves to one another is required. For this purpose, both halves of the drum or only one of the two halves of the drum can be rotated, with only one rotary drive on one side or rotary drives on both sides of the Cable drum can be provided. Preferably, only one rotary drive is provided for driving the first half of the drum, which can be arranged on the inside facing the machine frame. The rotary drive can thus be attached to the machine frame.

A further embodiment provides a locking device which is designed in such a way that one of the two halves of the drum can be locked in relation to the machine frame. If only one of the two halves of the drum is to be driven, the second half of the drum can be locked by means of the locking device.

The locking device can comprise a perforated body on one of the two drum halves with holes arranged circumferentially around the axis of rotation of the drum half and a stationary frame assigned to the drum half with a bore, so that a bolt for locking the drum half can be pushed through the bore of the frame into one of the holes . However, the locking can also take place by means of other locking devices, for example by means of a braking device acting on the cable drum or its drum half.

The road construction machine can be a slipform paver, the machine frame of which has a right-hand frame part running in the working direction and a left-hand frame part running in the working direction, between which a slipform is arranged, the working device having a distributor device arranged in the working direction in front of the slipform for distributing the concrete to be paved in a transverse to the working direction, the working device being a pusher that can be moved in the transverse direction.

The road construction machine can also be a slipform paver, the machine frame of which has a right frame part running in the working direction and a left frame part running in the working direction, between which a slipform is arranged, the working device having a working direction behind the sliding formwork is a smoothing device for smoothing the freshly made concrete, and the working device is a smoothing device that can be moved in a direction running transversely to the working direction.

In addition, the road construction machine can also be an after-treatment machine for freshly made concrete layers, the working device being a texturing device for texturing the freshly made concrete, and the working device being a brush element that can be moved in a direction running transversely to the working direction, or the working device being a spraying device for spraying the freshly made concrete with a liquid, the working device being a spray head which can be moved in a direction transverse to the working direction.

The advantages of the invention come into play in particular when the machine frame of the road construction machine and the linear guide of the working device are designed for the variable setting of different working widths, so that not only the problem of setting the cable tension but also the adjustment of the free cable length to the different working widths. The required cable tension can be established quickly and easily by twisting one or both halves of the drum. The rope supply can be distributed over both halves of the drum. It is particularly advantageous if the supply of rope is not equally distributed over the two halves of the drum, but instead the majority of the supply of rope is on one of the halves of the drum. The rope can be tightened outside the danger area on one side of the road construction machine. The cable can be re-tensioned manually on one side only or with a single rotary drive on one side only. With suitable drive units and adjustment mechanisms, the tensioning of the cable and the setting of the appropriate free cable length can also be partially or fully automated.

Exemplary embodiments of the invention are described in detail below with reference to the drawings.

Fig. 1

eine schematische Darstellung eines Gleitschalungsfertiger mit einer variablen Arbeitsbreite als ein Beispiel für eine Straßenbaumaschine in der Draufsicht, welcher über eine in Arbeitsrichtung vordere und hintere Arbeitseinrichtung verfügt,

Fig. 2

eine schematische Darstellung einer Nachbehandlungsmaschine für frisch gefertigte Betonschichten mit einer variablen Arbeitsbreite als ein Beispiel für eine Straßenbaumaschine in der Draufsicht, welche über eine Arbeitseinrichtung verfügt,

Fig. 3A, 3B und 3C

eine schematische Darstellung einer ersten Ausführungsform der Seilwinde der Arbeitseinrichtung zur Veranschaulichung des Funktionsprinzips,

Fig. 4A und 4B

eine schematische Darstellung einer zweiten Ausführungsform der Seilwinde in der Draufsicht,

Fig. 5A

eine der beiden Trommelhälften der Seiltrommel der Seilwinde in der Draufsicht einer dritten Ausführungsform der Seiltrommel,

Fig. 5B

die andere der beiden Trommelhälften der Seiltrommel der Seilwinde der dritten Ausführungsform in der Draufsicht, und

Fig. 5C

eine Sperrklinke der Seiltrommel der dritten Ausführungsform.

Show it:

1

a schematic representation of a slipform paver with a variable working width as an example of a road construction machine in plan view, which has a front and rear working device in the working direction,

2

a schematic representation of a curing machine for freshly made concrete layers with a variable working width as an example of a road construction machine in plan view, which has a working device,

Figures 3A, 3B and 3C

a schematic representation of a first embodiment of the cable winch of the working device to illustrate the functional principle,

Figures 4A and 4B

a schematic representation of a second embodiment of the cable winch in plan view,

Figure 5A

one of the two drum halves of the cable drum of the cable winch in the top view of a third embodiment of the cable drum,

Figure 5B

the other of the two drum halves of the cable drum of the cable winch of the third embodiment in plan view, and

Figure 5C

a pawl of the rope drum of the third embodiment.

1 shows a highly simplified schematic representation of a slipform paver as an example of a self-propelled construction machine.

The slipform paver has a machine frame 1 which is supported by a chassis 2 . The chassis 2 comprises a front left chain drive unit 3A in the working direction I and a front right chain drive unit 3B and a rear left chain drive unit 4A in the working direction and a rear right chain drive unit 4B. The crawlers are fixed to the machine frame by means of front left and right jacks 5A, 5B and rear left and right jacks 6A, 6B.

The machine frame 1 comprises a left frame part 7A in the working direction I, a right frame part 7B and a middle frame part 8. The middle frame part 8 can be lengthened or shortened to change the working width of the slipform paver. For this purpose, piston/cylinder arrangements 9 that are only indicated in outline can be provided, or individual frame pieces 8A can be inserted into or removed from the middle frame part 8 .

Between the outer frame parts 7A, 7B there is a sliding formwork 10 running transversely to the working direction for producing a concrete layer for a roadway. The slipform 10 also has a variable working width, for example by inserting and removing individual slipform segments 10A.

In addition, the slipform paver comprises a front working device 11 in the working direction I, which is arranged in front of the slipform 10, and a rear working device 11' in the working direction I, which is arranged behind the slipform in the working direction.

The front and rear working devices 11, 11' each comprise a longitudinal guide 12 running transversely to the working direction, on which a carriage 13 is guided in the transverse direction, as well as a cable system 14 for moving the carriage. The same reference numbers are used for the parts of the working device that correspond to one another. The working width of the longitudinal guide 12 can also be changed by inserting and removing longitudinal guide parts 12A. The cable system 14 of the two working devices has a cable 15 running in the transverse direction, which is wound up or unwound by means of a cable winch 16 on the left in the working direction I and is deflected on a deflection roller 17 on the right in the working direction I. The carriage 13 is fastened to the cable 15 . An implement 18, 18' is attached to the carriage 13.

If the working width of the slipform paver is changed, the width of the working device 11, 11' must be adjusted. To do this, the free cable length of the cable system 14 must be changed. In addition, the cable 15 must be tensioned or re-tensioned for the cable system 14 to function properly. The structure and the function of the cable system 14 are described in detail below.

The front working device 11 is a distribution device for distributing the concrete to be placed in a direction running transversely to the working direction over the entire working width, with the working device 18 being a pusher, which is also referred to as a distributor blade. The rear working device 11' is a smoothing device for smoothing the freshly made concrete, and the working implement 18' is a smoothing device.

2 shows as an example of a self-propelled construction machine with a working device a curing machine for freshly made concrete layers. The components corresponding to the slipform paver are denoted by the same reference numbers. In the after-treatment machine, the working device 11" can be a texturing device for texturing the freshly made concrete, with the working device 18" being a brush element that can be moved in a direction running transversely to the working direction I. However, the working device 11" can can also be a spray device for spraying the freshly made concrete with a liquid, the working device 18'' being a spray head which can be moved in the transverse direction.

The Figures 3A, 3B and 3C show a first embodiment of the cable winch 16 of the cable system 14 in a simplified schematic representation. The cable winch 16 has a cable drum 19 which comprises a first and a second drum half 20, 21. The first and second drum halves 20, 21 are attached to the machine frame 1 such that they can rotate about a common axis of rotation 22. Figure 3A shows the cable winch 16 in the first operating mode and Figure 3C shows the cable winch in the second operating mode. Figure 3B shows a view of the end face of the cable drum 19 from a direction opposite to the working direction I.

The first drum half 19 is driven by means of a drive unit 23 which is provided on the machine frame 1 . The drive unit 23 can have a hydraulic motor or an electric motor, for example.

The first and second drum halves 20, 21 each have a connecting element 20A, 21A on the end faces, which in the present exemplary embodiment is a clutch disk with a clutch lining. The two drum halves 20, 21 are resiliently prestressed against one another in the axial direction, as a result of which the clutch discs are pressed against one another. The torque that can be transmitted with the clutch discs is sufficient to be able to transmit the carriage 13 during operation of the road construction machine. The torque that can be transmitted is determined by the design of the clutch discs and the contact pressure.

The free ends of the cable 15 deflected on the deflection roller 17 are attached to the cable drum 19 in opposite directions. The free end of the upper piece of rope ( Figure 3B ) is attached to the first drum half 20 ( Figure 3A ), and the free end of the lower piece of rope ( Figure 3B ) is attached to the second drum half 21 ( Figure 3A ) fixed so that when the cable drum 19 rotates clockwise A (in the Top view of the cable drum viewed from a direction opposite to working direction I) the incoming, upper piece of cable is wound up on the first half of the drum 20 and the outgoing, lower piece of cable is unwound from the second half of the drum 21. Consequently, the carriage 13 attached to the upper piece of cable is moved with the working device 18, 18', 18" in the direction of the arrow a ( 1 , Figures 3A, 3B ) move from right to left (seen in working direction) ( 1 ). However, the carriage can also be attached to the lower piece of cable, which reverses the direction of movement. A counter-clockwise rotation of the cable drum B results in a movement of the implement in the direction of arrow b from left to right (seen in the working direction). Consequently, the implement can be moved in both directions a, b, which corresponds to the first operating mode.

For tensioning the cable 15, the cable winch 16 has a locking device 24 attached to an outer frame 1A of the machine frame 1, which in the present exemplary embodiment has a hydraulically, pneumatically or electromagnetically actuated locking element 24A, for example a bolt, which can be displaced. On the outside, the second drum half 21 has a perforated body 25 with holes 25A arranged circumferentially around its axis of rotation 22, into which the locking element 24A, which can be pushed forward through a bore 1AA in the frame 1A, can engage in order to attach the second drum half 21 to be locked to the stationary frame 1A. Instead of a locking device with an automatically actuable locking element, a bolt can also be pushed manually through the bore 1AA into one of the holes 25A for locking.

To set the second operating mode, the second drum half 21 is locked by means of the locking device 24 ( Figure 3C ). To tension the cable 15 in the second operating mode, the first drum half 20 is rotated clockwise A by means of the drive unit 23, with the second drum half 21 being held in place. The two halves of the drum 20, 21 act as slip clutches ( Figure 3C ), which corresponds to the second mode of operation.

To adapt the free cable length to a reduced or increased working width, the second drum half 21 is locked and the first drum half 20 is rotated clockwise A or counterclockwise B, which corresponds to the second operating mode.

A control unit 26 ( Figure 3A ) provided, which can be part of the central control unit of the road construction machine, not shown. The drive unit 23 and the locking device 24 are connected to the control unit 26 via control lines 23A, 24C. The control unit 26 can be configured in such a way that the individual method steps for tensioning the cable or for adjusting the free cable length are carried out fully automatically.

The Figures 4A and 4B show an alternative embodiment in which the connecting elements do not produce a non-positive connection, but rather a positive connection. Corresponding parts are denoted by the same reference numbers. The connecting element 20A of the first drum half 20 has in the present embodiment in the Figures 4A and 4B claws 20AA, shown only in outline, which engage in corresponding recesses 21AA provided on the second drum half 21, so that a form-fitting connection is produced.

In the alternative embodiment, the cable winch has an adjustment device 27 which is designed in such a way that the first drum half 20 can be moved in the axial direction relative to the second drum half 21 . The adjusting device 27 can include hydraulic, pneumatic or electromagnetic drive means, for example a piston/cylinder arrangement, which are connected to the control unit 26 via a control line 27A. The control unit 26 can again be configured in such a way that the individual process steps for tensioning the cable or for adjusting the free rope length can be carried out fully automatically. However, the adjusting device 27 can also include, for example, an adjusting screw that can be operated manually.

To tension the cable 15, the control unit 26 actuates the adjusting device 27 in such a way that the first cable drum 20 moves from a first position in which the claws 20AA are engaged ( Figure 4A ), is moved axially to a second position in which the claws 20AA are disengaged ( Figure 4B ). In addition, the control unit 26 actuates the locking device 24 in such a way that the second drum half 21 is locked. After locking the second half of the drum 21, the control unit 26 activates the drive unit 23 so that the cable 15 is wound up on the first cable drum 20 to tension it (rotational direction A is clockwise as seen from a direction opposite to the working direction I) or in the event of a change of the working width to shorten or lengthen the free rope length, the rope is wound up on the first rope drum 20 or unwound from the rope drum 20 (direction of rotation A or B). The first cable drum 20 is then moved back into the first position and the locking device 24 is released again ( Figure 4A ).

The Figures 5A , 5B and 5C show a further alternative embodiment in a simplified schematic representation, which differs from the embodiment of the Figures 4A and 4B differs in that the cable winch 16 is designed such that the first and second drum halves 20, 21 form a clutch acting only in one direction of rotation. Structure and function of the cable winch 16 from the Figures 5A , 5B and 5C otherwise correspond to the embodiment of the Figures 4A and 4B . The winch 16 therefore also has in the Figures 4A and 4B illustrated drive unit 23, locking device 24 and adjusting device 27 as well as the control unit 26. Figure 5A shows a plan view of the end face of the first drum half 20, while Figure 5B shows a plan view of the end face of the second drum half 21 .

On the end face of the first drum half 20, locking pieces 20AB are provided circumferentially distributed around its axis of rotation 22 at predetermined intervals ( Figure 5A ). The second drum half 21 has on the end face around its axis of rotation 22 circumferentially distributed locking pawls 21AB which engage in the first position of the drum halves in the locking pieces 20AB ( Figure 5B ), so that the drum halves 20, 21 form a freewheel. Figure 5C 12 shows one of the plurality of pawls 21AB engaging one of the plurality of pawls 20AB. The pawl 21AB is equipped with an in Figure 5C spring (not shown) is resiliently pretensioned, so that a force F acts on the pawl, as a result of which the pawl is supported with a first contact surface 28A on a stop surface 28B on the end face of the second drum half 21 and with a second contact surface 29A on a second stop surface 29B the locking piece 20AB of the first drum half 20 is supported. When the first drum half 20 is rotated relative to the fixed second drum half 21 in the direction of arrow A, which corresponds to the direction of rotation A in Figure 4A corresponds, the locking piece 20AB catches the pawl 21AB on its inclined surface 30, so that the pawl moves in the direction of the arrow C ( Figure 5C ) is rotated (freewheel). A rotation of the first drum half 20 in the opposite direction of rotation B ( Figure 5C ) is not possible because the pawl 21AB blocks rotation in this direction. The torque required to move the implement 18, 18', 18" can therefore be easily transmitted in the direction of rotation B. The spring tension F can be dimensioned such that in the event that the first cable drum 20 is driven by the drive unit 23 in the direction of rotation A and the locking device 24 releases the second cable drum 21 (first operating mode), the torque required to move the implement in both directions (left and right) can be transmitted without "the clutch slipping".

To tighten the cable 15 or to shorten the free cable length, the second half of the drum 21 is locked, with the first half of the drum 20 being rotated in the direction of rotation A. The specified distances in which the Locking pieces 20AB of one of the two drum halves 20 are arranged, and the predetermined distances at which the locking pawls 21AB of the other of the two drum halves 21 are arranged are matched to one another in the manner of a vernier scale. This creates a large number of locking positions, so that the cable tension can be adjusted in relatively small steps.

When the first drum half 20 is in the first position, however, the free length of rope cannot be extended because the "clutch is engaged" (cf. Figure 4A ). In order to lengthen the free cable length, the first half of the drum 20 is moved into the second position by means of the adjusting device 27, in which the locking blades 21AB are disengaged (cf. Figure 4B ). The first drum half 20 is then rotated in the direction of rotation B so that the rope 15 can unwind from the first drum half 20 . For this purpose, the second half of the drum 21 does not need to be locked.

Claims (15)

Road construction machine, in particular slipform paver or curing machine for freshly made concrete layers, with a machine frame (1) carried by running gears (3A, 3B; 4A, 4B) and on which a working device (11) is provided, which in a direction transverse to the working direction (I) working device (18) which can be moved in the direction running, which is fastened to a carriage (13) which is guided on a linear guide (12) running transversely to the working direction,
characterized in that the carriage (13) is connected to a cable (15) which is deflected on one longitudinal side of the machine frame (1), the free ends of which are attached to the cable drum (19) of a cable winch (16) on the other longitudinal side of the machine frame (1) in such a way that that the carriage (13) can be moved in the transverse direction by rotating the cable drum, wherein the cable drum (19) has a first and a second drum half (20, 21), one end of the cable (15) being attached to one drum half (20) and the other end of the cable being attached to the other drum half (21), and that the cable winch (16) is designed in such a way that the cable winch can assume a first operating mode in which the first and second drum halves (20, 21) are connected to one another in such a way that rotating the first and/or second drum half into one or other direction, the carriage (13) is moved in one direction or the other, and the cable winch can assume a second operating mode in which the first and second drum halves (20, 21) can be rotated in opposite directions at least in one direction of rotation, so that by a relative rotation of one half of the drum relative to the other Drum half the rope tension of the rope (15) is adjustable. Road construction machine according to Claim 1, characterized in that the first drum half (20) has at least one first connecting element (20A) and the second drum half (21) has at least one second connecting element (21A), the at least one first and second connecting element (20A, 21A ) are designed in such a way that in the first operating mode a non-positive connection is established between the at least one first and second connecting element. Road construction machine according to Claim 1, characterized in that the first drum half (20) has at least one first connecting element (20A) and the second drum half (21) has at least one second connecting element (21A), the at least one first and second connecting element (20A, 21A ) are designed such that in the first operating mode a form-fitting connection is established between the at least one first and second connecting element. Road construction machine according to Claim 1, characterized in that the cable winch (16) is designed in such a way that the first and second drum halves (20, 21) form a clutch which acts only in one direction of rotation. Road construction machine according to Claim 4, characterized in that one of the two drum halves (20) has at least one locking piece (20AB) and the other of the two drum halves (21) has at least one spring-loaded locking pawl (21AB), the at least one locking blade (21AB) in the at least one locking piece (20AB) engages. Road construction machine according to Claim 5, characterized in that one of the two drum halves (20) has a plurality of locking pieces (20AB) which are distributed circumferentially around an axis of rotation (22) of the drum half at predetermined intervals, and the other of the two drum halves (21) has a plurality of pawls (21AB) which are arranged about an axis of rotation (22) of the drum half in predetermined distances are distributed circumferentially. Road building machine according to Claim 6, characterized in that the predetermined distances at which the locking pieces (20AB) of one of the two drum halves (20) are arranged and the predetermined distances at which the pawls (21AB) of the other of the two drum halves (21 ) are arranged, are coordinated in the manner of a vernier, so that the drum halves can assume a variety of locking positions. Road building machine according to one of Claims 5 to 7, characterized in that the first drum half (20) and the second drum half (21) between a first position, in which the at least one pawl (21AB) engages in the at least one locking piece (20AB), and a second position are axially displaceable relative to each other, in which the at least one pawl (22AB) is disengaged from the locking piece (20AB). Road construction machine according to one of Claims 1 to 8, characterized in that the cable winch (16) has a locking device (24) which is designed in such a way that one of the two drum halves (20, 21) can be locked in relation to the machine frame (1). . Road construction machine according to Claim 9, characterized in that on one of the two drum halves (21) there is a perforated body (25) with holes (25A) arranged circumferentially around the axis of rotation (22) of the drum half and a stationary frame (1A) assigned to the drum half (21). are provided with a bore (1AA), so that a locking element (24A) can be pushed through the bore (1AA) of the frame (1A) into one of the holes (25). Road construction machine according to one of Claims 1 to 10, characterized in that the cable winch (16) has a drive unit (23) for driving one of the two drum halves (20, 21). Road construction machine according to one of Claims 1 to 11, characterized in that the road construction machine is a slipform paver whose machine frame (1) has a right frame part (7B) running in the working direction (I) and a left frame part (7A) running in the working direction, between which a sliding formwork (8) is arranged, the working device (18) being a distribution device arranged in the working direction (I) in front of the sliding formwork (8) for distributing the concrete to be placed in a direction running transversely to the working direction (I), the working device (18 ) is a slide that can be moved in the transverse direction. Road construction machine according to one of Claims 1 to 11, characterized in that the road construction machine is a slipform paver whose machine frame (1) has a right frame part (7B) running in the working direction (I) and a left frame part (7A) running in the working direction, between which a sliding formwork (8) is arranged, the working device (11') being a smoothing device arranged behind the sliding formwork (8) in the working direction (I) for smoothing the freshly manufactured concrete, and the working device (18') in a direction transverse to the working direction running direction movable smoother is. Road construction machine according to one of claims 1 to 11, characterized in that the road construction machine is a post-treatment machine for freshly made concrete layers, wherein the working device (11") is a texturing device for texturing the freshly made concrete, and the working device (18") is a brush element that can be moved in a direction running transversely to the working direction, or the working device (11") is a spraying device for spraying the freshly made concrete with a liquid, the implement being a (18") spray head movable in a direction transverse to the direction of work. Road construction machine according to one of Claims 1 to 15, characterized in that the machine frame (1) of the road construction machine and the linear guide (12) of the working device (18', 18", 18") are designed for variable setting of different working widths.

Images