DE10027083A1 - Traveling device for mobile gantry crane, has steering angle fixing section provided to each underframe to fix pivoting bodies to desired steering angles - Google Patents

Abstract

The device includes four corner underframes (20) individually provided with front and rear pivoting bodies (30',30) installed with tires (40',40). A hydraulic cylinder (61) is installed to each underframe, to pivot each front pivoting body along a front axis (11'). A link (70) extends from each front pivoting body to the rear pivoting body, to pivot the rear pivoting body along a rear axis (11). - DETAILED DESCRIPTION - A steering angle fixing section is provided to each underframe to fix the pivoting bodies to desired steering angles. A driving unit is installed to each underframe to drive the tires.

Description

The present invention relates to a conveyor crane and in particular a transport or movement device for a conveyor crane, which is only a wheel turning section and use a steering bracket fixing section per chassis det which bil the transport device of the conveyor crane det.

A conveyor crane according to the prior art is described in conjunction with FIGS. 1 to 4. A conveyor crane in the manner of a gantry crane 1 is shown in FIG. 1. A pair of support beams 3 are supported on four support elements 2 , and a conveyor 4 is mounted on the pair of support beams 3 in order to transport a freight 5 . Such a conveyor crane is often used to convey the cargo 5 , such as a container box, to a freight port or a freight warehouse.

The conveyor crane 1 is equipped with a transport device 100 , which directs the conveyor crane 1 in a desired direction and moves in this direction. In the trans port device 100 , four chassis 110 are provided, each of which has two or four wheels on which a pair of support beams 6 of the crane 1 are supported. The conveyor crane 1 is with the help of the Transportvorrich device 100 , which has the chassis 110 , each with wheels mounted thereon, able to perform a forward and backward movement, a rotation while standing and a lateral movement.

Fig. 2 is a schematic view of a chassis showing an example of a conventional transport device used for a hoist crane. According to FIG. 2, each undercarriage 110 has a front and a rear separate body 130 , which are arranged separately from one another and in each case rotatable about a pair of carrier shafts 120 on which the crane 1 is supported. If the crane 1 is carried with eight wheels, a wheel 140 is mounted on each separate body 130 so that it can be moved or moved. If the crane 1 is carried with sixteen wheels, two wheels are movably mounted on each separate body 130 . A motion drive section 150 for driving the wheels 140 is provided on each chassis 110 . Each separate body 130 of the chassis 110 has a rotating hydraulic cylinder 160 for adjusting a steering angle of the wheel 140 and a fixing hydraulic cylinder 170 for fixing the wheel 140 in a steered state.

In other words, the conventional Transportvor direction 100 of the hoisting crane 1 with the structure shown in FIG. 2 Darge of the chassis 110 includes four motion drive sections 150 , eight rotating hydraulic cylinders 160 and eight fixing hydraulic cylinders 170th

In the con ventional transport device 100 constructed in the manner described above, the following problem arises: Because a rotating hydraulic cylinder 110 and a fixing hydraulic cylinder 170 are mounted on each separate body 130 of the chassis 110 , the structure of the transport device 100 is complex, the weight increased and high manufacturing costs are required.

Furthermore, in the conventional Transportvor direction 100 , as shown in Fig. 2, by an individual drive of the two rotating hydraulic cylinders 160 , which are each provided for two wheels 140 per chassis 110 , a difference between the steering angles of the two wheels 140th , which run along an outer or inner circumference, as a result of which a different position of the wheels 140 is avoided when the hoisting crane 1 is rotating.

This design, however, has the difficulty that all rotating hydraulic cylinders 160 must be controlled independently of one another and precisely, so that all wheels 140 are held exactly orthogonally to imaginary lines which run through a center of rotation of the crane 1 .

Fig. 3 shows a schematic view of another chassis, which illustrates another example of another conventional transport device 100 used for a hoist crane. According to Fig. 3 a chassis 210 for such a conventional transport device in a manner comparable to the chassis aforementioned 110 is constructed according to Fig. 2, namely, inasmuch as two separate bodies 230 are each mounted for rotation about a pair of support shafts 210 on which the Crane 1 supports and at least one wheel 240 is mounted on each separate body 230 .

However, the chassis 210 used in this example differs from the aforementioned chassis 110 of FIG. 2 in that only one rotating hydraulic cylinder 260 and one fixing hydraulic cylinder 270 are used for each chassis 210 and the two separate bodies 230 , which form the chassis 210 , are coupled to one another via a connecting rod 280 . When a steering angle of a wheel 240 is changed by a separate body 230 , the steering angle of the other wheel 240 of the other separate body 230 is also changed by the connecting rod 280 in a coupled or synchronized manner, whereby the steering angle of the front and rear wheels 240 can be adjusted by the same amount at the same time.

The conventional transport device according to FIG. 3 has the advantage that the number of rotating hydraulic cylinders 260 and the fixing hydraulic cylinders 270 is reduced by half compared to that of the rotating hydraulic cylinders 160 and the fixing hydraulic cylinders 170 according to the embodiment in FIG. 2 , which simplifies the construction of the entire transport device. Due to a structural limitation dahinge basis that the respective wheels 240 may not be orthogonal held for rotation center of the crane 1 during a standing rotation of the conveyor crane 1 and, therefore, an (imaginary) center line L1 of the chassis 210 can not pass through the center of rotation of the crane 1 , the conventional transport device has disadvantages insofar as not all wheels 240 can be arranged parallel to (imaginary) tangent lines at the location of the standing rotation of the hoisting crane 1 , but only in slightly different positions, in which it is not, from the outset the possibility prevent misalignment of the wheels 240 inwards or outwards.

This problem of the conventional transport device according to FIG. 3 is particularly prevalent when a ro tation is carried out while the hoisting crane 1 is standing. This is explained in more detail with reference to FIG. 4: Assuming that a center 01 is the center of rotation of the conveyor crane 1 and two vertical lines are center lines of the right and left chassis 210 , which are each separated by the same distance, a change of direction of the wheels 240 of each chassis 210 is carried out by rotating two parallel sides of an (imaginary) parallel logram formed by two separate bodies 230 , which are connected to one another by the rotating hydraulic cylinder 260 and the connecting rod 280 . As a result, the front wheel 240 'and the rear wheel 240 "cannot be steered by each chassis 210 at the same steering angle.

When the wheels 240 of the four chassis 210 move along a circumference of a circle C to perform a standing rotation of the hoisting crane 1 , the front wheels 240 'of the front chassis 210 ' and the rear wheels 240 "of the rear chassis 210 " on a circle forced, the radius of which is larger by the distance ΔR compared to the circle on which the rear wheels 240 "of the front chassis 210 'and the front wheels 240 ' of the rear chassis 210 " run.

When the front wheels 240 'of the front chassis 210 ' and the rear wheels 240 "of the rear chassis 210 ", which run along the outer circumference, and the rear wheels 240 "of the front chassis 210 'and the front wheels 240 ' of the rear chassis 210 ", which run along the inner circumference, are driven at the same speed, the former wheels have a reduced angular speed in comparison to the latter wheels. Because the chassis 210 due to the difference in the angular velocity between the first and last mentioned wheels are tensioned or pressed in or out, the rotation process of the hoisting crane 1 is impaired when standing, and there is partial wear on the tires of the wheels on.

Even if the relative speed of the front wheels 240 'of the front chassis 210 ' and the rear wheels 240 "of the rear chassis 210 ", which run along the outer circumference, is increased, the problem related to tensioning or misalignment of the chassis cannot be solved. Due to the fact that the two separate bodies 230 of each chassis 210 are connected to each other by the rotating hydraulic cylinder 260 and the connecting rod 280 , which essentially determine the shape of the parallelogram described above, and therefore the front and rear wheels 240 ' and 240 "of each trolley 210 can be changed in one direction only by the same angle by having a (imaginary) line from the center of each of the front and rear wheels 240 'and 240 " to the center of rotation 01 of the crane 1 and an orthogonal line to one axis of each of the front and rear wheels 240 'and 240 ", it goes without saying that there is a large difference between the steering angles A and A' of the front and rear wheels 240 'and 240 " of each chassis 210 . These angles are indicated by the two lines drawn.

In Fig. 4, the location of the rotation of the conveyor crane 1 is indicated as a circle C, which runs through the centers of the respective chassis 210 , and the direction of movement of each wheel 240 runs parallel to a tangent line, which is drawn on the circle C. When a standing rotation of the conveyor crane 1 is carried out at this rotation location, the left front chassis 210 'a and the right rear chassis 210 "b are pressed inwards and the left ke rear chassis 210 " a and the right front chassis 210 ' b are pushed outwards. Even in the event that the speed of movement of the front wheels 240 'and the rear wheels 240 "of the respective chassis differs from one another, a smooth rotation of the conveyor cranes is not ensured.

This disadvantage is exacerbated in the case of a 16-wheel crane in which each chassis is equipped with a pair of front wheels and a pair of rear wheels. Since in the case of a 16-wheel crane four wheels, which are mounted on each chassis, have different rotation radii, tangential directions and win kel velocities with a standing rotation of the För derkranes 1 , the misalignment between the wheels is even greater, whereby a smooth rotation of the Conveyor crane 1 can not be ensured. Furthermore, since a rotation radius of the 16-wheeled conveyor crane 1 is significantly increased in comparison to its width, the space efficiency in a freight port or a container or freight warehouse is considerably deteriorated.

While usually an 8-wheel in the prior art Crane can be used more often than a 16-wheel crane  he due to the fact that an 8-wheeled crane has one Has basic contact pressure that is twice as large as that of a 16-wheel crane is not useful in white chem reason be used. There is also the cargo port or a freight warehouse must be designed in such a way that the Bear the increased permissible basic contact pressure additional expenses for a foundation or fun concrete for concrete necessary.

The invention seeks to remedy this. H. the above Avoid disadvantages of the prior art.

The invention achieves this aim through the subject of Claim 1. Advantageous embodiments of the invention are specified in the dependent claims.

In one aspect of the present invention, it comprises Transport device according to the invention for a conveyor crane with several chassis, each with a front and have a rear separate body on which at least one wheel is mounted: a movement instruction drive section for driving the wheels, which on little at least one of the front and rear separate body each the chassis is arranged; a wheel turning section, the one on the front and rear separate body each chassis acts and a steering force on at least applies a wheel mounted on it; a connection cut to transfer the steering force, which one of the before whose and rear separate body is fed, too on the other body, the connection from cut between the front and rear separate bodies is arranged such that a difference between the Steering angles of the front and rear separate body is fathered; and a steering angle fixing section for fixie the steering angle of the front and rear separate bodies pers in the desired position.

With the structure according to the invention can advantageously be avoided be changed that the wheels during z. B. a forward and  Backward movement, a rotation while standing or one lateral movement of the conveyor crane, in an unfavorable Angular position are directed inwards or outwards; and the wheels can be adjusted to the respective optimal steering angle placed and held in a fixed position.

Furthermore, the invention advantageously provides transportation direction for a conveyor crane, which only one Rä the turning section used and verver for each chassis can casually prevent wheels when the Conveyor cranes, e.g. B. forward and backward movement, a rotation while standing or a lateral movement, in can be distracted inwards or outwards.

Furthermore, the present invention advantageously provides one Transport device for a conveyor crane, which only uses a steering angle fixing section per chassis and the wheels in the angles set, each z. B. a forward and backward movement, a standing Rotation or a lateral movement of the conveyor crane possible, keeps fixed.

In a preferred embodiment of the present Invention, the connecting portion comprises a long ver tie rod, which with one of the front and rear separate body connected, a short connection rod, which with the other of the front and rear separate body is connected and a connecting link, which has one end with the chassis between the front and rear separate body is connected and with the other end with the long connecting rod and the short connecting rod is connected.

In a further preferred embodiment of the above lying invention includes the steering angle fixing section a swivel bracket on one of the front and rear se separate body is mounted to ge together with this to be turned, and with engaging grooves in a manner is formed that the engagement grooves the steering angle of the  Wheels correspond which move forward and backward movement, a standing rotation or a lateral movement enable the conveyor crane, as well as a fixing cylinder with an engaging pin, which is optionally in one of the one handle grooves is indented to a deflected state from one of the front and rear separate bodies fi keep anchored.

Other aims, features and advantages of the present Er are based on the detailed Be Description of preferred embodiments in connection with the attached schematic drawing light. The drawing shows:

Fig. 1 is a schematic perspective view illustrating the structure of a conventional hoisting crane;

Fig. 2 is a schematic view of a chassis, which illustrates an example of a conventional transport device which is used for a conveyor crane;

Fig. 3 is a schematic view of another chassis, which illustrates another example of another conventional transport device which is used for a conveyor crane;

Fig. 4 is a view illustrating an arrangement of chassis to explain a problem that occurs with a stationary rotation of the trans port device of FIG. 3;

Fig. 5 to 7 are schematic plan views of a driving frame which processing the structure of a Transportvorrich for a hoisting crane according to one Ausführungsbei of the present invention game illustrated, where 5 wheels shows in Fig., Which are provided for performing a forward and backward movement of the conveyor crane, Fig. 6 shows wheels which are made to perform a standing rotation of the hoisting crane, and Fig. 7 shows wheels which are made to perform a lateral movement of the hoisting crane;

Which are Figs. 8 to 10 are schematic views which illustrate the operation of limit switches disposed port device to a Lenkwinkelfixierabschnitt the Trans, in which Fig. 8 shows a state in which the steering angle of the wheels fixed for a forward and backward movement of the conveyor crane, Fig. 9 shows another state in which the steering angles of the wheels are fixed for a standing rotation of the hoisting crane, and Fig. 10 shows another state in which the steering angles of the wheels are fixed for a lateral movement of the hoisting crane; and

Fig. 11 is a view showing the operation of limit switches, which are installed on a rear separate body.

The following is a preferred one in more detail Embodiment of the invention received, which in of the accompanying drawing. As far as possible Lich the same reference numerals in the drawing and in the description below to designate the same or equivalent parts used.

Figs. 5 to 7 show schematic plan views of a chassis, which processing the structure of a crane Transportvorrich of a conveyor according to an embodiment of the present invention. Fig. 5 shows the wheels set to perform forward and backward movement of the hoisting crane; FIG. 6 shows the wheels that are set to perform a stationary rotation of the conveyor crane, and FIG. 7 shows the wheels that are set to perform a lateral movement of the conveyor crane. Figs. 8 to 10 are ten schematic Ansich which illustrate veran the operation of limit switches which are installed at a Lenkwinkelfixierabschnitt of the transport device, wherein Fig. 8 shows a state in which the steering angle of the wheels for the forward and backward movement of the Conveyor cranes are fixed, Fig. 9 shows another state in which the steering angle of the wheels for the stationary rotation of the conveyor crane are fixed and Fig. 10 shows another state in which the steering angle of the wheels for the lateral movement of the conveyor crane is fixed are. Finally, Fig. 11 is a view illustrating the operation of limit switches installed on a rear separate body.

First, the construction of a transport device of a conveyor crane according to an embodiment of the present invention is described below, for example with reference to a 16-wheel conveyor crane, as shown in FIG. 5. The transport device 10 of a conveyor crane according to the present invention can be used in the previously described conveyor crane 1 with a total of four undercarriages 20 , each of which has a front and rear rotatable separate body 30 , to which two wheels 40 are each mounted. Each of the four chassis 20 is designed such that it has a movement drive section 50 in wesentli Chen, a wheel drive section 60 , a connecting section 70 and a steering angle fixing section 80 .

The movement drive section 50 has the function of supplying the wheels 40 with a driving force so that the conveyor crane 1 can be moved. Conventional Antriebsvorrich lines, which can be used for the hoisting crane 1 , can also be used as a section 50 according to the invention. A detailed description of the concrete structure and the energy supply scheme of such a motion drive section 50 are generally known to the person skilled in the art, so that it can be dispensed with here.

While two movement drive sections can also be mounted on the front and rear separate bodies 30 'and 30 "for directly driving all wheels 40 from each chassis 20 , it is preferred in the present invention in view of a design simplification of the entire transport device 10 , that the driving force is directly transmitted only to the rear wheels 40 "and the front wheels 40 'rotate freely, as shown in Fig. 5. As can be easily seen in this case in FIGS . 5 to 7, the movement drive section 50 is mounted on the rear separate body 30 "in order to be rotated together with this when performing a steering operation.

In order to change a direction of movement of the conveyor crane 1, the wheels must be turned around a pair of support shafts 11 around predetermined angle 40, on which the För carried derkran. 1 For this purpose, a wheel turning cut 60 is provided for each chassis 20 in the Transportvor device 10 according to the present invention.

The wheel rotation section 60 is not particularly limited to a specific structure, as long as it is able to rotate the wheels 40 in desired steering directions. Before lying, a hydraulic cylinder 61 is preferably used to form the wheel rotating section 60 in such a way that one end of the hydraulic cylinder 61 is rotatably attached to a support section 21 of the chassis 20 and the other end of the hydraulic cylinder 61 is rotatable with one of the separate bodies 30 'and 30 "of the chassis 20 is connected in a state in which the other end of the hydraulic cylinder 61 is spaced from the carrier shaft 11 ' or 11 " as shown in Figs. 5 to 7.

In the preferred embodiment of the present invention, it is shown that a first rotating plate 62 'is fixedly mounted to the front separate body 30 ' to be rotated therewith, and the hydraulic cylinder 61 between the first rotating plate 62 'and the bracket gerabschnitt 21 of the chassis 20 is connected. In the above-described construction of the wheel rotating section 60, when the hydraulic cylinder 61 is activated and as soon as the first rotating plate 62 'is rotated around the support shaft 11 ', the front separate body 30 'is also rotated around the support shaft 11 ', thereby the steering angle of the wheel 40 'which is mounted on the front separate body 30 ' is changed.

Since only one wheel rotating section per chassis 20 is mounted in the transport device 10 of a conveyor crane according to the present invention in order to transmit a steering force directly to the wheels 40 ′ from a separate body (for example the front separate body 30 ′) and thereby the wheels 40 to steer, it is neces sary that the steering force of the wheel rotating section 30 is also transmitted to the wheels 40 'of the other separate body (for example the rear separate body 30 "), to which the steering force of the wheel rotating section 60 is not immediately supplied. In other words, it is necessary to make provision for the transmission of the steering force of the wheel rotating portion 60 from the front separate body 30 'to the rear separate body 30 ".

For this purpose, in the present invention, the connecting portion 70 is provided between the front separate body 30 'and the rear separate body 30 "to transmit the steering force of the intermediate wheel rotating portion 60. According to the present invention, the connecting portion 70 is in a manner constructed such that, when the wheels 40, a steering angle of 0 ° or 90 ° for forward and backward movement and a side BEWE supply of the conveying crane 1 is to be held, provided all the gears 40 exactly at a steering angle of 0 ° or 90 ° be, as shown in Fig. 5 or 7, and when the wheels are to be 40 at predetermined steering angles which are suitable for vertical rotation of the conveyor crane 1, steered, the steering angle of the front wheels 40 'of the front se Paraten body 30 'and the rear wheels 40 "of the rear separate body 30 " are made independent of one another and differently the above Fig. 4 can be seen, the connecting portion 70 of the features forming the vorlie constricting invention hence the transport apparatus 10 according to the present invention, according to which al le wheels orthogonal to the imaginary Li nien made of the chassis 20 40, which extends through a center of a place for standing rotation of the hoisting crane 1 , where is prevented by a deflection or misalignment of the wheels inwards and outwards.

That is, the connecting portion 70 , which constitutes one of the characteristic features of the transportation device 10 according to the present invention, connects the front separate body 30 'and the rear separate body 30 "to each other such that when a standing rotation of the Crane 1 is performed depending on the position (a front position or a rear position) of each chassis 20 with respect to the crane 1 and the position (a front position or a rear position) of the wheels 40 of each chassis 20 which current along an inner periphery of wheels 40 and the running along an outer periphery of wheels 40 orthogonal (imaginary) to the lines to be maintained, passing through the center of the location of the stationary rotation of the conveyor crane. 1 When the crane 1 while standing in the counterclockwise direction, as in Fig. 6 is rotated, the steering angle is Θ1 of the front Ra of 40 'is greater than the steering angle Θ2 of rear wheels 40 ", whereby the front wheels 40 'running along the outer circumference and the wheels 40 " running along the inner circumference are placed orthogonally to the lines which pass through the center of the location of the standing rotation of the hoisting crane 1 , such as has been described above.

Preferably, the connecting portion 70 for changing the steering angle of the front separate body 30 'relative to the steering angle of the rear separate body 30 ", as shown in FIGS . 5 to 7, comprises a long connecting rod 71 which is connected to the front separate body 30 ' is connected, a short connecting rod 72 , which is connected to the rear separate body 30 ", and a connecting member 73 , which is rotatably fastened to a section 21 of the chassis 20 of the chassis 20 between the front and rear separate bodies 30 'and 30 " , and with the other end the long connecting rod 71 and the short connecting rod 72 connec det.

The long connecting rod 71 is rotatably connected at one end to one side of the first rotary plate 62 ', this side being opposite to another side to which the hydraulic cylinder 61 is connected, so that the long connecting rod 71 by a predetermined distance from the carrier shaft 11 'is removed. The long connec tion rod 71 extends towards the rear separate body 30 '. Therefore, when the wheel rotation section 60 is activated to rotate the front separate body 30 'counterclockwise from, for example, a state shown in FIG. 5 to a state shown in FIG. 6, the long connecting rod 71 is pivoted and approached in the horizontal direction the rear separate body by 30 ".

When the long connecting rod 71 is pivoted to the rear, the connecting member 73, which is connected to the long connecting rod 71 is pivoted one of its ends in a clockwise direction, which is rotatably attached to the support portion 23rd When the connecting member 73 is hereby rotated, the short connecting rod 72 , which is connected to the connecting member 73 , is also pivoted to the rear.

A second rotating plate 62 "is mounted on the rear separate body 30 " for rotating together therewith. The short connecting rod 72 is connected to one end on one side of the second rotary plate 62 ", this side being positioned on the same section (ie a left section of the chassis 20 in FIG. 5) of the chassis 20 as the side of the first Rotating plate 62 ', to which the long connecting rod 71 is connected, so that the short connecting rod 72 is a predetermined distance from the carrier shaft 11 "away. When the short connecting rod 72 is pivoted rearward, the rear separate body 30 "is synchronized in the same direction counterclockwise with this rotates ge.

Under these conditions it is possible, depending on the dimensions of the crane 1 that are inherent to each crane, such as the radius of a standing rotation or the distance between the front and rear separate bodies 30 'and 30 "by suitable ones Determination of a first point at which the hydraulic cylinder 61 of the wheel rotating section 60 is connected to the first rotary plate 62 , the distance from the first point to the carrier shaft 11 ', a second point at which the long connecting rod 71 to the first rotary plate 62 ', the distance from the second point to the carrier shaft 11 ', the length of the long connecting rod 71 , the installation position and the length of the connecting member 73 , a third point at which the short connecting rod 72 is connected to the second rotary plate 62 " the distance from the third point to the support shaft 11 ", and so on, the front separate body 30 'and the like nd the rear separate body 30 "each in different Lenkwin angle, in accordance with the radius of standing rotation, which is inherently determined by the hoisting crane 1 , for which the transport device according to the present invention is applied.

Fig. 6 shows an example in which the lengths and installation positions of the respective structural elements are selected in a manner that the steering angles of the front and rear body 30 'and 30 "Θ1 and Θ2 to a standing rotation of the hoist crane. 1 to enable. When set this steering angle all the wheels of the crane 1 are each positioned orthogonally to the imaginary lines which run through the center of the location of the stationary rotation of the conveyor crane 1, whereby a misalignment of the wheels inwardly or outwardly prevented from the outset.

If the wheels rotating portion continues to be driven 60 is in the state of FIG. 6, the front and rear separate body 30 'are and directed in positions 30 ", in wel they chen by 90 ° from the angular positions for forward and backward movement in Fig. 5. In these 90 ° positions, a lateral movement of the lifting crane 1 can be carried out.

After the front and rear separate bodies 30 'and 30 "are set to have predetermined steering angles for performing the forward and backward movement of standing or lateral rotation, it is necessary to fix the steering angles of the wheels 40 , so that the steering angle does not change during the movement of the crane 1 .

To this end, in the present invention, a steering angle fixing portion 80 is installed on any one of the front and rear separate bodies 30 'and 30 ". The steering angle fixing portion 80 is not particularly limited to a specific structure, as long as it is able to do so before and to hold rear body 30 'and 30 "each in their predetermined steering angles. In this embodiment of the present invention, a pivot bracket 81 is mounted on any (e.g., the front separate body 30 ') of the front and rear separate bodies 30 ' and 30 "to be rotated therewith. The pivot bracket 81 is provided with a plurality of engagement grooves ausgebil det, the wheels correspond to each of positions 40, these positions preferably downward movement forward and back, allowing a standing rotation or lateral movement of the conveyor crane. 1 the engaging grooves include a first engagement groove 82 for a forward and backward movement, a second engagement groove 83 for a standing rotation and a third engaging groove 84 for lateral movement of the conveyor crane. 1 is preferably a Lenkwinkelfixierabschnitt 80 is used, which has a Fi comprises xierzylinder 85th the fixing cylinder 85 is fixed to the support portion 21 of the chassis 20 near the Drehbü gels 81 installed and we d driven in such a way that it optionally interacts with one of the first to third engaging grooves 82 , 83 and 84 . An engagement pin 86 is reciprocally received in the fixing cylinder 85 at one end thereof. The other end of Einrückstiftes 86 projects from the fixing cylinder 85 projecting in the direction of the rotary bracket 81 so that it can be brought selectively to one of the first to third engagement grooves 82, 83 and 84 by activating the engagement cylinder 85 engaged.

In this embodiment of the present invention, as shown in FIGS. 5 to 7, the first rotary plate 62 ', to which the hydraulic cylinder 61 and the long connecting rod 71 are connected, also functions as a rotary bracket 81 of the steering angle fixing portion 80 thereby reducing the number of components. In this context, it is self-evident for the person skilled in the art that separate elements can also be used to construct the first rotary plate 62 'and the rotary bracket 81 .

In the transport device 10 according to the present invention, the wheel rotating section 60 is precisely controlled in such a way that the steering angle of the wheels 40 is set precisely at 0 °, in the angles Θ1 and Θ2 or 90 ° which are typical of a standing rotation for the hoisting crane 1 , if you want to perform a forward and backward movement, a standing rotation or a lateral movement. In order to enable the steering angle fixing section 80 to keep the wheels 40 stable in their respective steering states for a certain time when the steering angles of the wheels have been set in the manner just described, a plurality of limit switches 90 to 95 for controlling the operation of the steering angle fixing section 80 are preferred and the wheel rotating section 60 in the vicinity of the Lenkwinkelfelfixierab section 80 and the front and rear separate Kör pers 30 'and 30 "installed, as indicated by circles in Fig. 6.

As is illustrated, for example, in FIGS. 8 to 10, three limit switches 90 , 91 and 92 can be arranged in the vicinity of the fixing cylinder 85 of the steering angle fixing section 80 in such a way that they are spaced apart from one another in order to define a predetermined contour.

Also, according to FIG. 11, three further limit switch 93, 94 and 95 for the forward and backward movement, the stationary rotation or lateral movement fixed to the support portion 21 of the chassis 20 in vicinity of the rear separate body 30 "installed, the Carrier shaft 11 "is rotated, in such a way that they are arranged one above the other in a vertical direction. In addition, three protrusions 93 ', 94 ' and 95 'for the forward and backward movement, the standing rotation and the lateral movement on an outer peripheral surface of the rear separate body 30 "are formed in such a way that with a change in the steering angle of the wheels 40, the three projections 93 ', 94 ' and 95 'can be brought into contact with the three limit switches 93 , 94 and 95 one after the other. For this purpose, the projections 93 , 94 , 95 are designed so that they are vertical and circumferential For the person skilled in the relevant art it is understood that the distances between two projections 93 ', 94 ' and 95 'must correspond to those between two of the limit switches 93 , 94 and 95 in order to be reliable Ensure the operation of the three limit switches 93 , 94 and 95 .

In Fig. 8, with such an arrangement of the limit switch 90 to 95, a state is shown in which the steering angle fixing portion 80 is brought into engagement with the first engagement groove 82 for forward and backward movement, the engagement groove 82 being formed in the rotary bracket 83 , whereby the steering angle of the wheels 40 are fixed in a manner suitable for forward and backward movement of the hoisting crane 1 , ie in a state in which the limit switches 90 , 91 and 92 are not in contact with the engagement pin 86 of the steering angle fixing section 80 , When an operating lever is operated to perform a standing rotation of the hoisting crane 1 , the engagement pin 86 of the fixing cylinder 85 is disengaged from the first engagement groove 82 by being retracted. The retraction movement of the engagement pin 86 is interrupted when the engagement pin 86 has reached a position at which it can be brought into engagement with the second engagement groove 83 for a standing rotation or a position at which it has two limit switches 90 and 91 in Is brought in contact, as it is shown in Fig. 9 ge. Correspondingly, the front separate body 30 'is held in a state in which it can be steered into a position for performing the standing rotation of the crane 1 .

If the retraction movement of the engaging pin 86 is interrupted after, for example, 1 or 2 seconds have elapsed, the hydraulic cylinder 81 of the wheel turning cut is driven. Then, the rotation of the front separate body 30 ', the activation of the connecting portion 70 and the rotation of the rear separate body 30 ' are carried out sequentially, as explained above with reference to FIGS. 5 to 7. When the rear separate body 30 "reaches the position at which a standing rotation of the hoisting crane 1 is enabled, the standing rotation limit switch 94 is brought into contact with the standing rotation protrusion 94 'as shown in FIG. 11 , whereby the operation of the hydraulic cylinder 61 is interrupted and the steering process for the stationary rotation of the hoisting crane is completed.

Due to the fact that the rotation of the front separate body 30 'is limited by the engaging pin 86 of the fixing cylinder 86 , which has already been moved into its position in which it is engaged in the second engagement groove 83 for standing rotation the Transportvor device 10 fixed in the steering angles, which allow a Rotati on while standing. As a result, as previously described, the steering operation of the transport device 10 to enable the stationary rotation is completed. Fig. 10 shows, for example, a state in which the fixing cylinder 85 is completely disengaged from the first to third engaging grooves 82 , 83 and 84 which are formed in the rotating bracket 81 , and the front separate body 30 'can be freely rotated.

While here the transport device 10 according to the invention has been described in connection with the change in the steering angle of the wheels, in order to enable the conveyor crane 1 to be moved from a forward and backward movement position into a position for a standing rotation, it is obvious to a person skilled in the art that other steering angle change operations besides the forward and backward movement of the standing rotation and the sideways movement can be performed in a similar manner.

Furthermore, it is understood by those skilled in the art that the positions and functions of the limit switches 90 to 95 as described above are only an example. If the number, position and modes of operation of the limit switches are realized in a different way, the steering angle can be changed just as precisely in order, for. B. egg ne forward and backward movement, a standing rotation or a lateral movement; Likewise, the wheel rotation section 60 and the steering angle fixing section 80 can be controlled in a suitable and adapted manner in order to precisely fix the changed steering angle.

The above-mentioned components, such as the movement drive section 50 , the hydraulic cylinder 61 of the wheel rotating section 60 , the fixing cylinder 85 of the steering angle fixing section 80 and the like, are formed in such a way that they are actuated by a plurality of operating levers which are located in a driver's compartment of the hoisting crane 1 can be controlled, a detailed description of the operating mode can be dispensed with here.

As a result, the transport device according to the invention offers tion for a conveyor crane, as before here before has been described, several advantages in that for each chassis has only one motion drive section Wheel turning section, a connecting section and a steering angle fixing section can be used, which makes it possible is, e.g. B. a forward and backward movement, a ste rotation and a lateral movement of the conveyor crane without the appearance of an inside or outside Malposition of the wheels and the wheels in the respective steering angles for performing z. B. the forward and backward movement of the standing rotation and one to keep the lateral movement of the conveyor crane fixed.

Although in the description of the figures and in the drawing Description of a typical preferred embodiment specific terms were used in the invention, are these in a general and functional way, at least not restrictive to understand. The Schutzbe The invention is rich in the following claims certainly.

Claims (9)

1. Transport device for a conveyor crane ( 1 ) with several chassis ( 20 ), each having a front and a rear separate body ( 30 ', 30 "), on each of which at least one wheel ( 40 ', 40 ") is mounted , wherein the transport device ( 10 ) has:
a motion drive section ( 50 ) for driving the wheels ( 40 ', 40 ") disposed on at least one of the front and rear separate bodies ( 30 ', 30 ") of each chassis ( 20 );
a wheel rotation section ( 60 ) which acts on one of the front and rear separate bodies ( 30 ', 30 ") of each chassis ( 20 ) and applies steering force to at least one wheel ( 40 ', 40 ") mounted thereon;
a connecting section ( 70 ) for transmitting the steering force, which is supplied to one of the front and rear separate bodies ( 30 ', 30 "), also to the other body, the connecting section ( 70 ) between the front and rear separate bodies ( 30 ', 30 ") is arranged such that a difference between the steering angles of the front and rear separate bodies ( 30 ', 30 ") is generated; and
a steering angle fixing section ( 80 ) for fixing the steering angles of the front and rear separate bodies ( 30 ', 30 ") in the desired position. 2. Transport device according to claim 1, wherein the wheel rotation section ( 60 ) has a hydraulic cylinder ( 61 ). 3. Transport device according to claim 1 or 2, in which the movement drive section ( 50 ) is arranged on the rear separate body ( 30 "), and the wheel rotation section ( 60 ) and the steering angle fixing section ( 80 ) on the front separate body ( 30 ') ) are arranged. 4. Transport device according to one of the preceding claims, in which the steering angle fixing section ( 80 ) has a rotating bracket ( 81 ) which is mounted on one of the front and rear separate bodies ( 30 ', 30 ") in order to be rotated together with the latter be, and with engagement grooves ( 82 , 83 , 84 ) is designed in such a way that the engagement grooves correspond to steering angles of the wheels ( 40 '; 40 "), in which a forward and backward movement, a standing rotation or a lateral movement of the För derkranes ( 1 ) is made possible, and a fixing cylinder ( 85 ) with an engagement pin ( 86 ), which can optionally be engaged in one of the engagement grooves ( 82 , 83 ), to a Lenkzu state of the front and rear separate body fixed hold. 5. Transport device according to claim 4, wherein a plurality of first limit switches ( 90 , 91 , 92 ) in the vicinity of the fi xierzylinders ( 85 ) are arranged, the first Be limit switches are designed such that they the A back pin ( 86 ) in positions lock, in which this is optionally in engagement with the engaging grooves when one of the front and rear separate bodies is in positions, in which a forward and backward movement, a standing rotation or a lateral movement of the hoisting crane ( 1 ) becomes. 6. Transport device according to one of the preceding claims, in which a plurality of second limit switches ( 93 , 94 , 95 ) are arranged in the vicinity of one of the front and rear separate body, the second Be limit switches are designed such that they operate the loading Interrupt the wheel rotation section ( 60 ) when egg ner of the front and rear separate body is placed precisely in a steering angle, which enables forward and backward movement, a standing rotation or a lateral movement of the hoisting crane ( 1 ). 7. Transport device according to one of the preceding claims, in which the connecting section ( 70 ) has a long connecting rod ( 71 ) which is connected to one of the front and rear separate bodies, a short connecting rod ( 72 ) which is connected to the other of the front and rear separate body is connected, and has a Ver link ( 73 ) which has one end with the chassis ( 25 ) between the front and rear separate body and the other end with the long connec tion rod ( 71 ) and the short connecting rod ( 72 ) is related. 8. Transport device according to claim 7, wherein the wheel rotation section ( 60 ) and the long connecting rod ( 71 ) are connected at one end to a first rotating plate ( 61 ) which is installed such that they co-exist with one of the front and rear separate body is rotatable, and wherein the short connecting rod ( 72 ) is connected at one end to a second rotating plate ( 62 ) connected so that it is rotatable together with the other of the front and rear separate bodies. 9. Transport device according to claim 8, wherein the rotary bracket ( 81 ) and the first rotary plate are formed from the same part.