WO2010136097A1

WO2010136097A1 - Mobile crushing system

Info

Publication number: WO2010136097A1
Application number: PCT/EP2010/002336
Authority: WO
Inventors: Frank SEEHÖFER; Josef Scheid
Original assignee: ThyssenKrupp Fördertechnik GmbH
Priority date: 2009-05-13
Filing date: 2010-04-16
Publication date: 2010-12-02
Also published as: DE102009021167A1; DE102009021167B4

Abstract

The invention relates to a mobile crushing system (2) particularly for use in open-cast mining for comminuting raw material. The crushing system (2) comprises a support frame (4), a chassis device (6) connected to the support frame (4), a crushing device (8) connected to the support frame (4), a transport feeder (10) for feeding feedstock (G) to the crushing device (8), and a discharge transport device (12) for removing the comminuted feedstock (G'), wherein the discharge transport device (12) comprises a driven support chassis (14) supporting the discharge transport device (12) in addition to the support by the connection to the support frame (4) at an additional support point opposite a plane (P; P').

Description

Mobile crushing plant

Description:

The present invention relates to a mobile crushing plant according to the preamble of claim 1. Such a mobile crushing plant is already known under the title shredding device from EP 1 615 723 Bl. In this document, a crushing device is designed as a mobile or semi-mobile unit, in particular for use in surface mining and in the recycling industry, described. This crushing plant has all the generic features of the preamble of the present invention and is characterized in that the support structure has a component in the form of a horizontal U. The main purpose of the invention, both for the subject matter of the invention and for the object of the described prior art, are large coal, ore or oil sand mines, said plant according to the invention being used particularly advantageously, for example when the extraction of the raw materials under conditions of freezing or using explosives and backhoes for immediate subsequent loading of the crushing plant to take place.

The present invention is based on the object to provide a mobile crushing plant, which ensures a significant increase in efficiency compared to known from the prior art systems. A mobile crushing plant in the sense of the invention is understood in particular to be a so-called fully mobile crushing plant, which is characterized by the fact that during the entire crushing operation (crushing operation) - following the extraction progress continuously - by parallel or simultaneous operation of the (rough) Chassis (especially without stopping them) can move along a mining front.

The above-described object is achieved by the combination of the features of patent claim 1. Advantageous developments of the invention are part of the dependent claims. Basis for the inventive considerations was a vollmobile crushing plant with a discharge conveyor to create, which is designed in the form of a single conveyor bridge and supplies the crushed feedstock from the crushing means by means of a continuous belt conveyor over a distance of about 30 m to 120 m to Strossenband and at this hands over. This instead of a crushing plant with a separate discharge conveyor, which, installed in the support frame below the crushing device, a further separate conveyor (eg a belt carriage) fed, and then the crushed mining groove then passes to the Strossenband. In a single-stage or multi-stage mining operation (multi-level: Planum with Planumebenen different geographical altitude) works a vollmobile crushing plant usually for material transfer to a Strossenband with a crusher and the Strossenband intermediate auxiliary device, a so-called. The shredded material (crushed feed material) passes through the mobile discharge jib of the fully mobile crushing plant to the feed boom of the belt trolley. The geometry of both devices (fully mobile crusher and belt trolley) is decisively determined by the degradation geometry, ie the number, the length and the height of the mining blocks. For large conveying capacities and thus inevitably large degradation geometry, this leads to dimensions for the belt trolley that can no longer be economically implemented. Among other things, the intention of the invention is to make it possible to dispense substantially with the use or interposition of band conveyors (for material transfer of the feed material comminuted by the crushing device to a conveyor belt).

According to the invention, the described object is achieved in that the swiveling in horizontal and vertical direction Abwurffördereinrichtung (in particular designed as a conveyor belt device) correspondingly long dimensioned and is supported at its free end in addition via a movable support chassis against a planum. In this case, said support undercarriage is advantageously coupled to the support frame of the mobile crushing away from the free end of the discharge conveyor to this. The support undercarriage with its own drive, which is designed in particular in the form of a double crawler undercarriage, is preferably freely movable or positionable in the direction of the longitudinal axis of the discharge conveyor within limits (of, for example, +/- 5 to 10 m) or coupled thereto. The support undercarriage is controlled in particular manually or automatically controlled.

In a particularly preferred embodiment of the invention, the discharge conveyor device designed as a belt conveyor is, in particular in the region of its middle third of its Longitudinal extent provided with a bending axis over which the discharge conveyor can be bent in the vertical direction, so that differences in height in the mining area can be easily bridged. Further embodiments and further developments of the invention can be found in the subclaims.

Also in a particularly preferred embodiment or development of the invention, the support frame of the fully mobile crushing plant according to the invention is designed such that it has a U-shaped support frame part, which is arranged substantially lying and which is turned away with its free leg ends of the feed conveyor. Furthermore, the crushing device is advantageously arranged on the upper free leg of the U-shaped support frame part, while the discharge conveyor is advantageously pivotally mounted between the two free leg ends Ul and U2 both in the horizontal and in the vertical and is arranged in particular at the lower leg end. With regard to the configuration of the partially U-shaped carrying framework, reference is made at this point to the initially mentioned EP 1 615 723 B1 and whose relevant content is expressly included in the disclosure content of the present application.

The invention is illustrated below with reference to drawing figures for different exemplary embodiments and explained in more detail. Show it:

Fig. Ia a mobile crushing plant according to the invention in a schematic representation in

Seen from top view,

FIG. 1b shows the mobile crushing plant according to FIG. 1a in a side view, FIG.

2a a mobile crushing plant according to FIG. 1a, which has a pivotable short discharge boom at the free end of its discharge conveyor;

FIG. 2b shows the mobile crushing plant according to FIG. 2a in a schematic side view, FIG.

3a-3c, the mobile crushing plant according to the preceding figures in a development with abkickenable Abwurffördereinrichtung - shown at different Planumabbaubondiern or Planumhöhen, 4a is a sectional view of the mobile crushing plant according to Fig. Ib along the

Cutting line A-A,

4b shows a sectional view of a detail from FIG. 4a along the section line CC ₁

5 is an enlarged detail of the detail Y of FIG. 3b,

Fig. 6 is an enlarged detail of the detail X of Fig. Ib and

7 is a sectional view taken along the section line B-B in Fig. 6th

In FIGS. 1 a and 1 b, a mobile crushing plant according to the invention in a first possible embodiment is shown in a schematic representation. This is advantageously a fully mobile crushing plant, which is at the same time freely movable during the crushing operation. The vollmobile crushing plant 2 comprises a support frame 4, which is connected to a chassis device 6 (comprising two crawlers), connected to the support frame 4 breaking device 8, a feed conveyor 10 with a feed side arranged feed container 10a and a discharge conveyor 12 for the removal of shredded feed G '. In this case, the discharge conveyor 12 is advantageously designed in the form of a single, optionally multi-part conveyor belt bridge, which is in the region of its free end facing away from the support frame 4 of the mobile crushing plant 2 - preferably in the region of the second half, in particular in the region of the last third of its Longitudinal extent - is provided with a support undercarriage 14, by means of which it is supported against the plane P. The support frame 4 is advantageously designed such that it has a U-shaped support frame part, which is arranged substantially lying and which is turned away with its free leg ends of the feed conveyor 10. In this case, the crushing device 8 is arranged on the upper free leg U2 of the U-shaped support frame part, while the discharge conveyor 12 advantageously pivotable between the two free leg ends Ul and U2 both in the horizontal and in the vertical - in particular on the lower free leg Ul stored - is arranged. The loading conveyor 10, which is likewise arranged on the support frame 4, can be connected in a stationary manner to the support frame 4, wherein both the chassis device 6 embodied as a crawler track, in particular as a two-, three- or four-crawler running gear, and the support frame 4 and the loading conveyor device. tion in its longitudinal extent substantially parallel along the longitudinal axis A of the crushing plant 2 (corresponds to the longitudinal axis of the support frame 4 and the longitudinal axis of the mobile crushing plant 2 without pivoting Abwurffördereinrichtung 12) are aligned. In a preferred embodiment of the invention, the supporting undercarriage 14, which is also advantageously designed as a crawler undercarriage, is designed to be freely movable or positionable in the longitudinal direction of the discharge conveyor 12 at its limits (up to +/- 10 m). This is indicated by the double arrow D shown executed in the illustrated embodiment of a conveyor belt frame frame 12a, in which a driven discharge conveyor 12b is guided, which to be conveyed, crushed feed G 'via a discharge line - T promotes T on a subordinate Strossenband SB (passes). The drive, not shown, for the discharge conveyor 12b is advantageously arranged at the head end at the discharge end of the discharge conveyor 12. On the support frame 4, the ejection conveyor device 12 is designed to be vertically pivotable about a substantially horizontally arranged pivot axis Y2 (FIG. 1a) and pivotable about a substantially vertically arranged pivot axis Z2 (FIG. 1b) in the horizontal plane.

In FIGS. 2 a and 2 b, the mobile crushing plant 2 according to the invention is shown in FIGS. 1 a and 1 b (in plan view and in side view) in or on a plane number P; P ', which has areas of different heights. In FIG. 2a, the discharge conveyor 12 of the crushing plant 2 is shown by way of example in two different pivoting positions. In the illustrated embodiment, the mobile crushing plant 2 is positioned with its landing gear device 6 and arranged thereon or a supporting frame 4 connected thereto on a planum P with lower height, while the bridge of the ejection conveyor 12 is pivoted upwards in the vertical direction and by the support chassis 14th , which is arranged on a higher lying Planum P '(Figure 2b) is supported. In the embodiment according to FIGS. 2 a and 2 b, the mobile crushing plant at the free end of its discharge conveyor 12 has a short discharge boom 16, which likewise swivels about a pivot axis Z 1 arranged vertically within a predetermined tolerance band in the horizontal plane at the free end of the discharge conveyor 12 a substantially horizontally arranged pivot axis Yl is mounted pivotably in the vertical direction. In order to keep the discharge boom 16 with its vertically aligned or aligned pivot axis Zl within the predetermined tolerance band (of eg +/- 3 ° angular degrees deviation) aligned vertically, the discharge boom 16 via a controllable actuating cylinder St to the frame 12a of Abwurffördereinrichtung 12 connected. With the aid of the adjusting cylinder St, the discharge boom 16 can be pivoted about its horizontal pivot axis Y1 in such a way that a substantially vertical alignment of the vertical pivot axis Z1 is always ensured. In addition to the vertical pivotability of the discharge boom 16 about its horizontal pivot axis Yl, the belt conveyor 16a (delivery belt conveyor) is mounted pivotably about a horizontal pivot axis Y4 on the support structure 16b of the discharge boom 16. The pivotability of the belt conveyor 16a about its horizontal pivot axis Y4 is achieved by a controllable tilting cylinder N, via which the boom belt conveyor 16a is connected with its long free end to the support structure 16b. In the illustrated embodiment of the discharge conveyor 16, this has a substantially C-shaped support structure 16b (or the shape of a horizontal U). In this case, the support structure 16b is connected to the discharge conveyor 12 such that it encompasses the free end of the frame 12a of the discharge conveyor 12 at least partially with their free leg ends. Advantageously, the support structure 16b is connected to the frame frame 12a so as to be pivotable (about the horizontal pivot axis Y1) by means of a fastening leg extending inwards (or w perpendicularly downwards) from the upper free C-leg. For improved balancing of the discharge boom 16, a balancing weight B (preferably exchangeable) is arranged on its supporting structure 16b, in particular at the end of the upper free C-leg.

This embodiment described above has the advantage that the comminuted feedstock G ¹ can be transferred to the conveyor belt center of the feed belt SB in exactly the same position and in the lowest possible free fall height. The support trolley 14 may be manually controllable by passing over one on the planum P; P 'located operator (which is located with advantage in the range of the support gear 14) by means of a remote control the support gear 14 (remote) is controlled. Alternatively or in another mode of operation, the support chassis 14 may also be controlled (fully or partially) automatically. In this case, an additional sensor system is required, via which the exact positions of the discharge conveyor 12 and the conveyor belt SB are detected and transmitted to the control, so that a positionally accurate transfer of the comminuted feed material G ¹ can be ensured via this. In one embodiment, in which the ejection conveyor device 12 is provided with an additional short discharge arm 16 at its ejection end, the sensor system would in particular also have to detect its position and transmit it to the control device. Based on FIGS. 2a and 2b, FIGS. 3a, 3b, 3c each show a mobile crushing plant 2 in which it is positioned with its chassis device 6 on a level P, while the discharge end of the bridge of the discharge conveyor 12 is in different positions is supported on different planum heights P ¹ on the support chassis 14. According to FIG. 3 a, the discharge end of the discharge conveyor 12, analogous to the position shown in FIG. 2 b, is supported by the support chassis 14 on a higher level section P '. In FIG. 3 b, the chassis device 6 of the crushing plant 2 is at the same plan height P as the support chassis 14 supporting the ejection conveyor 12, while according to FIG. 3 c the bridge of the ejection conveyor 12 is inclined downwards in the horizontal direction and on a subgrade section P 'Lower height is supported on the support chassis 14. In the exemplary embodiment of the mobile crushing plant 2 shown in FIGS. 3a-3c, the discharge conveyor 12 is advantageously bendable, with a buckling axis YK extending in a horizontal direction transverse to the longitudinal axis A ^{1 of} the discharge conveyor 12, particularly in the middle third of its longitudinal extent. The bendable structural design of the discharge conveyor 12 will be described below.

FIG. 4a shows a sectional view from FIG. 1b along the section line AA. It can be seen from the sectional view according to FIG. 4a how, on the one hand, the crushing device 8 is held on the support frame 4 and, on the other hand, the breaker-side end of the ejection conveyor device is held or supported in the support frame 4. About the feed conveyor 10 shown in sections, the crushing device 8 is fed to crushing feed G, which is crushed by crusher in the form of jaw crushers, roll crushers or the like, which are rotationally driven by crusher drives 8a. The crushed feed G 'falls on a funnel Tl guided on the discharge conveyor 12b of the ejection conveyor 12. In this example, the ejection conveyor 12 is formed by a rolling elements W with pivot bearings L to compensate for inclinations of the chassis device 6 of the mobile crushing plant 2 on the support frame 4 of Crushing plant 2 stored. The frame 12a of the ejection conveyor 12 is seen in cross-section substantially U-shaped and open at the top in the region of the illustrated section AA of the illustrated embodiment, wherein it lies between its free leg ends above the upper flange 12b 'and underlying the lower flange 12b' The bottom leg, located between the two free legs of the frame 12a, is guided at its two lateral ends over the rolling elements W on bearing rails LS, as seen in cross section, so that the frame mend 12a banks of the chassis device 6 can compensate by movements of the support frame 12a in the direction of the double arrows DP. In order to prevent lifting of the rolling elements W from the bearing rails LS under unfavorable power conditions, according to Figure 4b (section CC of Figure 4a) between the rolling axis of the rolling elements W and the bearing rail LS acting as a safety catch boom AL ^{1 is} present. In this case, the arm AL ^{1 has} an angled free end, with which it engages in a (groove-like) recess of the bearing rail LS. In order to ensure horizontal pivotability, the discharge conveyor 12 is connected to the support frame 4 of the crushing plant 2 via a ring rolling bearing RW arranged coaxially to the vertical pivot axis Z2. The vertical pivotability of the discharge conveyor 12 about the horizontal axis Y2 is realized (in additional functionality) by the pivot bearing L. The pivot axes described (or pivoting movements) can also be realized by means of, for example, a ball joint (not shown) at the bearing point of the discharge conveyor 12 on the support frame 4.

In Fig. 5 is a structural design of the discharge conveyor 12 in the buckling region in the middle third of the longitudinal extent of the discharge conveyor 12 is shown. In this case, the frame 12a of the discharge conveyor 12 is provided in its bottom region with a transverse to the longitudinal axis A 'of the discharge conveyor 12 extending buckling axis YK to the two on the buckling axis YK interconnected parts of the Abwurfför- dereinrichtung 12 abknickbar to design. In this case, the frame 12a is opposite to the buckling axis YK provided in its upper part with adjusting cylinders V or adjusting spindles or the like, to ensure a winkeleinstellbares bending of the interconnected parts of the discharge conveyor 12 against each other on the one hand and on the other to produce sufficient stability.

6 shows a detailed view according to FIG. Ib. In the detail view shown, the coupling of the support chassis 14 to the discharge conveyor 12 is shown in one possible embodiment. Accordingly, the support chassis 14 is connected via a rocker construction WK with the discharge conveyor 12. About the rocker construction WK caused by the horizontal and / or vertical pivoting movements of the ejection conveyor 12 axial relative movement between the support gear 14 and the discharge conveyor 12 along the longitudinal axis A ^{1 of} the discharge conveyor 12 can be compensated. The rocker construction WK is essentially formed by a rocker W1 pivotally mounted about the horizontal axis Y3 and the vertical axis Z3 and has support rollers SR at its free ends, which are supported on the discharge conveyor device at their free ends. tion 12 arranged rails S interact with these. In this case, the rails S advantageously have a length which is dimensioned such that the support chassis 14 can be moved over a certain area along the longitudinal axis A 'at the discharge conveyor 12. In this way it can further be ensured that the support chassis 14 can avoid obstacles located on the platform P. In another, not shown embodiment of the invention, a plurality of such coupling regions for coupling the support chassis 14 to the ejection conveyor 12 may be present. Furthermore, the positionability ensured by the ejection conveyor 12 (in the direction of the longitudinal extension of the ejection conveyor 12) can reduce the occurrence of leverage forces - in the event that the ejection conveyor 12 should be lifted once.

FIG. 7 illustrates in a sectional view a possible connection of the support undercarriage 14 to the guide rail S of the ejection conveyor 12. According to this illustration, it can be clearly seen that the rocker construction WK is provided by the support rollers SR arranged on both sides at the ends of the rocker W1 and by the support rollers SR associated catching rollers FR ₁ which are connected via corresponding arms AL with the support rollers SR, is guided on the running rail S.

LIST OF REFERENCE NUMBERS

Mobile crushing plant 2

Shoring 4

Chassis mechanism 6

Crusher 8

Breaker drive 8a

Feeding conveyor 10

Feeding tank 10a

Dump conveyor 12

Frame 12a

Discharge conveyor 12b

Upper flange 12b ¹

Lower chord 12b '

Support chassis 14

Discharge boom 16

Boom belt conveyor 16a

Support structure 16b

Feedstock G

Comminuted feed G ¹

Planum P ₁ P '

Discharge funnel T

Funnel Tl

Strossenband SB

Swivel bearing L

Rolling elements W

Bearing rail LS

Ring rolling bearing RW

Adjusting cylinder V

Tilting cylinder N

Actuating cylinder St

Balance weight B

Support roller SR

Catching roll FR Rocker construction WK

Rocker Wl

Extension arm AL

(Rocker construction)

Bracket AL '

(Discharge conveyor)

Running track S

Longitudinal axis A (crushing plant or shoring)

Longitudinal axis A '(discharge conveyor)

Double arrow D (supporting landing gear, Fig. Ib)

Double arrow DP (rolling elements, Fig. 4a)

Vertical swivel axis Zl (discharge boom)

Horizontal swivel axis Yl (discharge boom)

Vertical swivel axis Z2 (ejection conveyor / shoring)

Horizontal swivel axis Y2 (ejection conveyor / shoring)

Vertical swivel axis Z3 (rocker construction / support undercarriage)

Horizontal swivel axis Y3 (rocker / support undercarriage)

Horizontal swivel axis Y4 (Boom conveyor / support structure)

Bend axis YK

(Discharge conveyor)

Lower U-thigh Ul

Upper U-thigh U2

Connecting U-leg U3

Claims

claims:

1. Mobile crushing plant (2), in particular for use in opencast mining for the subsequent comminution of raw materials, comprising - a supporting framework (4),

a chassis device (6) connected to the support frame (4) with at least one driven crawler track,

a breaking device (8) connected to the support frame (4),

- A feed conveyor (10) for supplying feed material (G) to the crushing device (8), wherein the feed conveyor (10) on the support frame

(4) is arranged and at its the refracting device (8) facing away, free end carries a feed container (10 a) for receiving the Aufgabeguts (G),

- An ejection conveyor (12) for the removal of the crushed Aufgabeguts (G '), said Abwurffördereinrichtung (12) with one end on the support frame (4) is mounted pivotably in the horizontal and vertical directions, characterized in that

- The ejection conveyor (12) has a driven support undercarriage (14), which supports the ejection conveyor (12) in addition to a support by the connection to the support frame (4) in an additional support point against a planum (P; P ').

2. Mobile crushing plant (2) according to claim I _1, characterized in that

- The support undercarriage (14) on which the support frame (4) facing away, the free end of the ejection conveyor (12) is arranged.

3. Mobile crushing plant (2) according to one of the preceding claims, characterized in that

- The support chassis (14) in the direction of the longitudinal axis (A) of the discharge conveyor (12) is movably arranged on the same.

4. Mobile crushing plant (2) according to one of the preceding claims, characterized in that

- The support undercarriage (14) via coupling means releasably connected to the Abwurffördereinrichtung (12), in particular in the direction of the longitudinal axis (A ') of the discharge conveyor means (12) at different attachment points of the same with this can be coupled.

5. Mobile crushing plant (2) according to any one of the preceding claims, characterized in that - the support undercarriage (14) controlled manually or automatically controlled - in particular optionally controlled manually or automatically - is formed.

6. Mobile crushing plant (2) according to any one of the preceding claims, characterized in that - the discharge conveyor (12) is designed in the form of a single or multi-part belt conveyor.

7. Mobile crushing plant (2) according to claim 6, characterized in that

- The Abwurffördereinrichtung (12) has a at its free, the support frame (4) turned away arranged drive for the operation of the belt conveyor.

8. Mobile crushing plant (2) according to one of the preceding claims, characterized in that

- The discharge conveyor (12) at its free end an additional discharge boom (16).

9. Mobile crushing plant (2) according to claim 8, characterized in that

- The discharge boom (16) pivotally about a within a predetermined tolerance band vertically aligned or vertically aligned within a predetermined tolerance band and aligned about a substantially horizontally oriented pivot axis (Zl; Zl, Yl) is mounted on the ejection conveyor (12) ,

10. Mobile crushing plant (2) according to one of the preceding claims 8 or 9, characterized in that

- The discharge boom (16) has a support structure (16b), which is at least partially C-shaped, or in the form of a horizontal U, executed.

11. Mobile crusher (2) according to claim 10, characterized in that - the support structure (16b) on the frame (12a) of the Abwurffördereinrichrich is arranged (12) that the support structure (16b) with its two free U- or C-leg ends, the free end of the frame (12a) encloses at least partially.

12. Mobile crushing plant (2) according to any one of the preceding claims 8 - 11, characterized in that

- The discharge boom (16) has a about a horizontal pivot axis (Y4) in the vertical direction pivotally mounted boom belt conveyor (16a).

13. Mobile crushing plant (2) according to claim 12, characterized in that

- The boom belt conveyor (16a) about a on the support structure (16b) of the discharge boom (16) acting tilting cylinder (N) about its horizontal pivot axis (Y4) is movable.

14. Mobile crushing plant (2) according to any one of the preceding claims 8 - 13, characterized by

- An on the one hand on the frame (12a) of the ejection conveyor (12) and on the other hand on the support structure (16b) of the discharge boom (16) acting, controllable actuating cylinder (St), so that via the actuating cylinder (St) an orientation of the vertical pivot axis (Zl) of the discharge boom (16) by pivoting the

Abwurfauslegers (16) around its horizontal pivot axis (Yl) is made possible.

15. Mobile crushing plant (2) according to one of the preceding claims 8-14, characterized in that - the discharge boom (16) on its frame structure (16b) on its side facing away from the delivery belt conveyor (16a) side a balancing weight (B) wearing.

16. Mobile crushing plant (2) according to one of the preceding claims, characterized in that

- The Abwurffördereinrichtung (12) has a bending axis (YK), over the two in the direction of the longitudinal axis (A ¹ ) successive parts of the discharge conveyor (12) are bent against each other.

17. Mobile crushing plant (2) according to one of the preceding claims, characterized in that

- The support frame (4) at least partially has the shape of a horizontal U.

18. Mobile crushing plant (2) according to claim 17, characterized in that

- The Abwurffördereinrichtung (12) between the two free U-legs (U1, U2) of the support frame (4) is connected to the same.

19. Mobile crushing plant (2) according to claim 18, characterized in that - the discharge conveyor (12) at the lower U-leg (Ul) of the support frame (4) about a vertical axis (12) is pivotally mounted horizontally on the support frame (4).

20. Mobile crushing plant (2) according to any one of the preceding claims 17-19, character- ized in that

- The Abwurffördereinrichtung (2) at the lower U-leg (Ul) of the support frame (4) about a horizontal axis (Y2) is vertically pivotally connected to the support frame (4).

21. Mobile crushing plant (2) according to one of the preceding claims, characterized in that

- The Abwurffördereinrichtung (12) via a ball joint connection or a weighing construction to the support frame (4) is connected.