DE102015104139B4 - Turntable for a large manipulator - Google Patents

Abstract

Turntable (3) for vertically and horizontally pivoting a mast arm (2) of a large manipulator (1) relative to a base frame (4), comprising: - a substantially circular screw connection plate (21) rotatably mounted relative to the base frame (4) for horizontal pivoting of the Mast arm, - two web plates (22, 23) arranged vertically on the screw connection plate (21), spaced apart from one another, between the insides of which the mast arm (2) is mounted vertically pivotable, - two cylindrically shaped, vertically on the circumference of the screw connection plate (21). casing plates (24, 25) arranged on the outer sides of the web plates (22, 23) and supporting the web plates (22, 23) in the front and rear areas of the turntable (3), the height of the casing plates (24, 25) being at their ends , where they connect to the web plates (22, 23), is larger than in the sections away from the web plates (22, 23), and - two flat cover plates (26, 27), each forming a circular segment, each with a straight and a substantially semicircular edge, the straight edge of the cover plates (26, 27) being connected to the outer sides of the web plates (22, 23) in order to form the web plates (22. 23) to be stiffened laterally, and the semicircular edge of the cover plates (26, 27) is connected to the jacket plates (24, 25).

Description

• - eine gegenüber dem Grundrahmen drehbar gelagerte, im Wesentlichen kreisförmige Verschraubungsplatte zum horizontalen Verschwenken des Mastarmes, und
• - zwei vertikal auf der Verschraubungsplatte, zueinander beabstandet angeordnete Stegbleche, zwischen deren Innenseiten der Mastarm vertikal verschwenkbar gelagert ist.

The invention relates to a turntable for vertically and horizontally pivoting a mast arm of a large manipulator relative to a base frame, comprising:

• - a substantially circular screw connection plate which is rotatably mounted relative to the base frame for horizontal pivoting of the mast arm, and
• - Two web plates arranged vertically on the screw connection plate, spaced apart from one another, between the insides of which the mast arm is mounted so that it can pivot vertically.

The invention further relates to a large manipulator with a turntable according to the invention.

Large manipulators, e.g. truck-mounted concrete pumps or distribution masts for concrete, are usually equipped with a mast arm that can be pivoted horizontally and vertically relative to a base frame in order to distribute concrete on a construction site. The concrete is fed by a truck mixer from a hopper to a concrete pump, which pumps the concrete via pipes along the mast arm to the delivery site.

For the horizontal and vertical pivoting of the mast arm, the mast arm is articulated to the base frame via a swivel frame, with the horizontal pivoting of the mast arm typically taking place by means of a ball swivel connection. The horizontal pivoting is usually carried out using a hydraulic motor with a drive pinion that drives a ring gear connected to the ball slewing ring. The vertical pivoting is carried out using one or more hydraulic cylinders that raise or lower the mast arm relative to the turntable. The distribution masts of today's truck-mounted concrete pumps sometimes have a boom length of sixty meters or more, so that due to the large length and weight of the mast arm, the turntable is exposed to extremely high loads, which are introduced into the base frame via the ball slewing ring. It should be taken into account here that the placing boom loads should be introduced into the circular ball slewing ring over the largest possible area via vertical support or web plates. If the introduction of force into the screw connection plate is too local, this can lead to failure of the weld seams and/or the ball slewing ring.

In order to meet the above-mentioned requirements, such turntables are usually complex and heavy welded steel structures, which are often reinforced with bent, folded or three-dimensionally shaped steel stiffening plates. These stiffening plates, which can have a thickness of 10 mm or more, are very complex to manufacture and increase the weight of the turntable. A large manipulator with a turntable designed in this way is, for example, in the WO 2014/040770 A1 described. More turntables are also available CN 203 654 767 U and CN 203 603 498 U known.

The weight of the turntable should be as low as possible because the total weight of a truck-mounted concrete pump with a mast arm mounted on a truck chassis is subject to legal restrictions. It is also more cost-effective to use less steel in the turntable. On the other hand, the forces from the mast arm or from the hydraulic cylinder lifting the mast arm should be able to be safely absorbed and supported by the turntable.

It is the object of the present invention to provide a turntable for a large manipulator that best meets the requirements described above.

• - zwei zylindrisch geformte, vertikal auf dem Umfang der Verschraubungsplatte an den Außenseiten der Stegbleche angeordnete und die Stegbleche jeweils im vorderen und hinteren Bereich des Drehschemels abstützende Mantelbleche aufweist, wobei die Höhe der Mantelbleche an deren Enden, an denen sie an die Stegbleche anschließen, größer als in dem von den Stegblechen entfernten Abschnitten ist,, sowie
• - zwei ebene, jeweils ein Kreissegment bildende Deckbleche mit jeweils einer geraden und einer im Wesentlichen halbkreisförmigen Kante, wobei die jeweils gerade Kante der Deckbleche mit den Außenseiten der Stegbleche verbunden ist, um die Stegbleche seitlich zu versteifen, und die jeweils halbkreisförmige Kante der Deckbleche mit den Mantelblechen verbunden ist.

This task is solved based on a turntable of the type mentioned at the beginning in that this

• - two cylindrically shaped casing plates arranged vertically on the circumference of the screw connection plate on the outer sides of the web plates and supporting the web plates in the front and rear areas of the turntable, the height of the casing plates being greater at the ends at which they connect to the web plates than in the sections removed from the web plates, as well
• - two flat cover plates, each forming a circular segment, each with a straight and a substantially semicircular edge, the straight edge of the cover plates being connected to the outer sides of the web plates in order to laterally stiffen the web plates, and the respective semicircular edge of the cover plates connected to the jacket plates.

The cylindrically shaped jacket plates and the flat, essentially semicircular cover plates are easy to produce in terms of production technology and the arrangement of these plates is very suitable, with a low weight of the overall construction of the turntable, in order to minimize the forces from the mast arm or from the hydraulic cylinder lifting the mast arm evenly into the screw connection plate and thus into the ball slewing ring underneath. The construction according to the invention stiffens the screw connection plate very effectively, which is an equal enables moderate power transmission to the ball slewing ring underneath. The essentially semicircular edge (according to the invention this also includes an edge with an elliptical course) of the cover plates is connected to the jacket plates.

According to the invention, the height of the cylindrically shaped jacket plates at the ends with which they connect to the web plates is greater than in a section lying between the ends. In other words, the jacket sheets are raised towards their ends. Through this measure, the web sheets are optimally supported by the jacket sheets, while the weight of the jacket sheets is as low as possible.

The flat cover plates fall from the straight edge with which they are arranged on the web plates to the semicircular edge with which they are connected (e.g. welded) to the jacket plates, opposite the screw connection plate, i.e. towards the outside. Due to this arrangement, the cover plates are, on the one hand, arranged high on the side of the web plates in order to laterally stiffen the web plates, and on the other hand, the cover plates contribute to increasing the transverse rigidity of the casing plates. In a further embodiment of the invention, the web plates have a cutout in the area below the cover plates. Due to the box-like structure of the casing plates in conjunction with the cover plates, the turntable has a very high level of rigidity and therefore the weight of the web plates can be reduced through cutouts in this area without significantly reducing the rigidity of the turntable.

According to a further embodiment of the invention, the cutouts in the web plates below the cover plates are open to the screw connection plate, and the web plates are only connected to the screw connection plate in the front and rear areas. This measure results in a further reduction in weight without significantly reducing the rigidity of the turntable.

At least one stiffening plate can be arranged between the web plates, which connects the web plates to one another, thereby increasing the rigidity of the turntable in a simple manner.

At least one stiffening plate between the web plates is arranged on the outer circumference of the screw connection plate in order to increase the rigidity of the turntable in the lower region.

Advantageously, a stiffening plate connecting the web plates is also arranged in the area of bolt receiving eyes for supporting the mast arm between the web plates. A stiffening plate at this point increases the rigidity of the turntable in the upper area.

Recesses are advantageously inserted into the web plates in the area above the cover plates, which further reduce the weight of the turntable without significantly reducing the rigidity of the entire turntable.

Exemplary embodiments of the invention are explained below with reference to the drawings.

• 1: einen Großmanipulator mit einem Drehschemel nach dem Stand der Technik;
• 2: eine perspektivische Ansicht eines Mastarmes eines Großmanipulators mit einem erfindungsgemäßen Drehschemel;
• 3: eine perspektivische Ansicht des erfindungsgemäßen Drehschemels;
• 4 eine weitere perspektivische Ansicht des erfindungsgemäßen Drehschemels;
• 5 eine Seitenansicht des erfindungsgemäßen Drehschemels;
• 6 eine Draufsicht auf den erfindungsgemäßen Drehschemel.

Show it:

• 1 : a large manipulator with a turntable according to the prior art;
• 2 : a perspective view of a mast arm of a large manipulator with a turntable according to the invention;
• 3 : a perspective view of the turntable according to the invention;
• 4 another perspective view of the turntable according to the invention;
• 5 a side view of the turntable according to the invention;
• 6 a top view of the turntable according to the invention.

1 shows a large manipulator 1 in the form of a truck-mounted concrete pump with a turntable 3 according to the prior art. The truck-mounted concrete pump 1 has a base frame 4 on which a chassis and a driver's cab 10 are arranged. The truck-mounted concrete pump 1 is supported with extendable supports 7 for concreting operations. On the base frame, below the mast arm 2, a concrete pump, not shown, which is usually designed as a two-cylinder piston pump, is arranged.

The foldable mast arm 2, shown here in the folded state, in 2 is shown in detail, is connected to the turntable 3 via a joint 14 and can be lifted out of the mast support 8 for the concreting operation by means of a hydraulic cylinder 11 supported on the turntable 3. During the concreting operation, the mast arm 2 is pivoted vertically by means of the hydraulic cylinder 11.

Liquid concrete, for example from a truck mixer, is fed to the concrete pump via the filling funnel 9. The still liquid concrete is then pumped by the concrete pump via a pipeline, not shown, through the mast trestle 5 and the turntable 3 along the mast arm 2 to the top of the mast and over an end, not shown hose deployed at the desired application location.

A ball swivel connection 6 is arranged between the turntable 3 and the mast support 5 in order to pivot the turntable 3 horizontally after the mast arm 2 has been lifted out of the mast support 8. For this purpose, for example, a drive with a hydraulic motor, a drive pinion and a ring gear that is driven by the pinion is provided. Other options for the rotary drive, such as a direct drive or rack and pinion drive with hydraulic cylinders, would also be possible. In order to achieve the most even distribution of the forces introduced by the mast arm 2 into the turntable 3 into the ball slewing ring 6, there are located on the side of the turntable 3 according to the prior art 1 two essentially conical reinforcements 3a, which direct the forces as evenly as possible to the outer circumference of the bottom of the turntable 3.

2 shows the mast arm 2, which can be pivoted horizontally and vertically via a turntable 3 according to the invention. The mast arm 2 consists of the mast arm segments 12, 13, 39 visible here and other mast segments not visible here. The mast segments 12 and 13 are straight and can be pivoted against each other by means of the hydraulic cylinder 18 and the joint kinematics 15. The mast segment 39, which can be pivoted relative to the mast segment 13 by means of the hydraulic cylinder 19 and the deflection gear 16, is provided with an offset so that further mast segments can be arranged to the side of the mast segments 12 and 13 in the folded state, of which only one is shown here Hydraulic cylinder 20 and joint kinematics 17 are visible, which are followed by further mast segments.

In 3 the turntable 3 according to the invention is shown in a perspective view obliquely from above. The information on the components arranged on the right and left refers to the direction of travel of the truck-mounted concrete pump.

The turntable 3 consists of a screw plate 21, on which a left web plate 22 and a right web plate 23 are arranged vertically. Unless otherwise noted, the components of the turntable 3 are usually welded together. However, it would also be conceivable to connect the components together using screws or other technologies, such as gluing. The turntable 3 is usually made of steel, but other materials, such as fiber-reinforced plastics CFRP or GRP, or combinations of these materials, are also possible. The web plates 22, 23 each have an inside and an outside, with the inside 3 Not shown first mast segment 12 of the mast arm 2 between the web plates 22, 23 is mounted vertically pivotable by means of at least one bolt connection in bolt receiving eyes 28, 29. The eyes 30, 31 form the articulation points for the mast cylinder 11, with which the mast arm 2 is raised and lowered. On the outer sides of the web plates 22, 23 there are two cylindrically shaped jacket plates 24, 25 which are arranged vertically on the screw connection plate 21 and which laterally support the web plates 22, 23. The jacket plates 24, 25 can also be arranged in such a way that they are not welded laterally to the web plates 22, 23 and, as shown here, part of the web plates 22, 23 protrude on the screw connection plate 21 in the front and rear areas, but that the Jacket plates 24, 25 are flush with the front and/or rear edges of the web plates 22, 23 or are arranged in front of the web plates 22, 23 on the circumference of the screw connection plate 21, so that the jacket plates 24, 25 enclose the web plates 22, 23 on the outside. Likewise, the jacket plates 24, 25 in the front and/or rear area of the turntable 3 can form a unit or a closed tube with a straight underside, which is welded onto the screw plate 21 and connected to the web plates 22, 23.

The height of the casing plates 24, 25 is greater at the ends at which they connect to the web plates than in the sections further away from the web plates 22, 23, i.e. in the sections lying between the ends, in order to keep the casing plates 24 as light as possible , 25 to optimally support the web plates 22, 23 laterally.

On the turntable 3 there are also two flat cover plates 26, 27, each forming a circular segment, each with a straight and a substantially semicircular edge, the straight edge of the cover plates 26, 27 being connected to the outer sides of the web plates 22, 23, and the each semicircular edge of the cover plates 26, 27 is connected to the jacket plates 24, 25 in sections or over the entire length. The cover plates 26, 27 stabilize the construction of the turntable 3 in the direction transverse to the boom plane and give the turntable 3 a high level of torsional rigidity.

Regarding the use of the term “substantially semicircular” in relation to the cover plates 26, 27, see 6 referenced, from which it can be seen that the web plates 22, 23 do not have to be arranged symmetrically on the turntable 3. In order to be able to place the folded mast arm 2 as symmetrically as possible, ie in the middle of the truck-mounted concrete pump 1, it is necessary to use the bridge che 22, 23 should be arranged laterally offset from the center line of the truck-mounted concrete pump 1 on the screw connection plate 21, which results in a different size for the jacket plates 24, 25 and the cover plates 26, 27 do not each describe a full semicircle. Due to the oblique arrangement of the cover plates 26, 27 on the casing plates 24, 25, ie the cover plates 26, 27 are arranged sloping from the straight edge to the semicircular edge in relation to the screw connection plate 21, they are also slightly elliptical in shape.

Both the cylindrical jacket plates 24, 25 and the flat cover plates 26, 27 are simple and inexpensive to manufacture and this design eliminates the need for complex and inaccurate folding of these plates.

Between the insides of the web plates 22, 23, stiffening plates 32, 33, 34, 35 are arranged, which connect the web plates 22, 23 to one another in order to achieve high rigidity of the construction. The two stiffening plates 32, 33 are arranged on the outer circumference of the screw plate 21. These stiffening plates 32, 33, like the jacket plates 24, 25, can be cylindrical in shape or can be made of flat plates to simplify the construction. A flat stiffening plate 34 is arranged between the web plates 22, 23 at the same height as the cover plates 26, 27. The stiffening plate 35 is bent and arranged in the upper area between the web plates 22, 23 below the bolt receiving eyes 28, 29. The stiffening plates 32, 33, 34, 35 are shaped similarly to the jacket plates 24, 25, i.e. they are relatively narrow in the area in the middle between the web plates 22, 23, become wider towards the web plates 22, 23 and run at the ends pointed in order to ensure maximum stiffening and durability of the construction over the longest possible weld seam to the web plates 22, 23 with the lowest possible weight of the stiffening plates 32, 33, 34, 35.

To reduce weight, two large recesses 36a, 36b, 36c, 36d are made in the web plates 22, 23. These recesses 36a, 36b, 36c, 36d can, as shown in the figures, be designed as openings in the web plates 22, 23 or alternatively they can also be milled outs in which a small thickness of the web plates 22, 23 in the area of the recesses 36a, 36b , 36c, 36d is retained. In order to compensate for a somewhat reduced rigidity of the construction due to the recesses 36a, 3b, 36c, 36d, the stiffening plate 35 is attached above the recesses 36a, 36b close to the edges of the recesses.

In the side view of the turntable 3 in 5 It can be seen that the recesses 36b, 36d in the web plate 22 are arranged in such a way that a web of sufficient width remains between them to allow the force F acting from the mast cylinder 11 via the eye 30 to pass between the recesses 36b, 36d into the lower one Area of the turntable 3 to pass through without the web plates 22, 23 being severely deformed. The web between the cutouts 36b, 36d is so wide that even with different angular positions of the mast arm segment 12, a safe transmission of force between the sections 36b, 36d can take place.

From the side view of the turntable in 5 It can also be seen that the cover plate 26 is arranged sloping towards the rear side of the turntable 3 along the web plate 22.

In this illustration, the openings 41 in the cover plates 26, 27 serve the purpose of making screw connections underneath the cover plates 26, 27 accessible. To reduce the weight of the cover plates 26, 27, they can also be provided with larger recesses, similar to the recesses 36a to 36d of the web plates 22, 23, for example as a centrally or eccentrically arranged, oval or round opening.

In 4 a perspective view of the underside of the turntable 3 is shown. In this figure it can be seen that the screw connection plate 21 is designed essentially annularly. Blind hole threads 40 are introduced into the annular screw connection plate 21 over the entire circumference, by means of which the turntable 3 is screwed to the ball slewing ring underneath. In principle, holes could also be provided here, and the screw connection plate would be screwed to the ball slewing ring using nuts and screws, as is usual in the prior art. However, the use of the blind hole thread 40 has the advantage that the top of the screw connection plate 21 can be used freely for the arrangement of the web plates 22, 23 and the jacket plates 24, 25. The weld seams for welding the web plates 22, 23 and the jacket plates 24, 25 to the screw connection plate 21 should, if possible, not run directly over one or more of the blind hole threads 40 in order to achieve the greatest possible strength of the welded connection.

In the 4 It can also be seen that the web plate 23 has a recess 38 in the area below the cover plate 26 and that the web plate 22 is only pulled down in the front and rear areas to the screw connection plate 21 and connected to it there is. In those areas in which the web plate 22 rests on the annular screw connection plate 21, the screw connection plate 21 is designed to be somewhat widened. The recess 38 in the web plate 23 is in 4 not recognizable, but in principle designed in the same way as the recess 38 in the web plate 22. A tab 37 with four holes is arranged on the web plate 22 in the area of the cutout 38, to which, for example, a holder for the passage of the concrete delivery line can be attached.

Reference symbol list

1

Truck-mounted concrete pump

2

mast arm

3

Turntable

4

Basic frame

5

masthead

6

Ball slewing ring

7

Support

8th

Mast support

9

Filling funnel

10

Cab

11

Mast cylinder

12

First mast segment

13

Second mast segment

14

Joint turntable / mast

15

first joint kinematics

16

second joint kinematics

17

third joint kinematics

18

Hydraulic cylinder

19

Hydraulic cylinder

20

Hydraulic cylinder

21

screw plate

22

Web plate on the left

23

Right web plate

24

Cover plate on the left

25

Cover plate on the right

26

Cover plate on the left

27

Cover plate right

28

Bolt receiving eye on the left

29

Bolt receiving eye on the right

30

Hydraulic cylinder eye on the left

31

Hydraulic cylinder eye right

32

rear casing plate

33

front casing plate

34

Stiffening plate below

35

Stiffening plate at the top

36

recesses

37

Pipe holder

38

Section of web plates

39

Third mast arm segment

40

Blind hole thread

41

Openings cover plates

Claims (10)

Turntable (3) for vertically and horizontally pivoting a mast arm (2) of a large manipulator (1) relative to a base frame (4), comprising: - a substantially circular screw connection plate (21) which is rotatably mounted relative to the base frame (4) for horizontal pivoting of the mast arm, - two web plates (22, 23) arranged vertically on the screw connection plate (21), spaced apart from one another, between the insides of which the mast arm (2) is mounted so that it can pivot vertically, - two cylindrically shaped jacket plates (24, 25) arranged vertically on the circumference of the screw connection plate (21) on the outer sides of the web plates (22, 23) and supporting the web plates (22, 23) in the front and rear areas of the turntable (3). ), the height of the jacket plates (24, 25) at the ends at which they connect to the web plates (22, 23) being greater than in the sections away from the web plates (22, 23), and - two flat cover plates (26, 27), each forming a circular segment, each with a straight and a substantially semicircular edge, the straight edge of the cover plates (26, 27) being connected to the outer sides of the web plates (22, 23), in order to stiffen the web plates (22, 23) laterally, and the semicircular edge of the cover plates (26, 27) is connected to the jacket plates (24, 25). turntable (3). Claim 1 , characterized in that the cover plates (26, 27) are arranged sloping from the straight edge to the semicircular edge relative to the screw connection plate (21). Turntable (3) according to one of the preceding claims, characterized in that the screw plate (21) is essentially annular. Turntable (3) according to one of the preceding claims, characterized in that the web plates (22, 23) each have a cutout (38) in the area below the cover plates (26, 27). turntable (3). Claim 4 , characterized in that the cutout (38) in the web plates (22, 23) is open to the screw connection plate (21) and the web plates (22, 23) are only connected to the screw connection plate (21) in their front and rear areas. Turntable (3) according to one of the preceding claims, characterized in that at least one stiffening plate (32, 33, 34, 35) is arranged in the area between the web plates (22, 23) that connects the web plates (22, 23) to one another. turntable (3). Claim 6 , characterized in that at least one stiffening plate (32, 33) is arranged between the web plates (22, 23) on the outer circumference of the screw connection plate (21). turntable (3). Claim 6 or 7 , characterized in that at least one stiffening plate (35) connects the web plates (22, 23) to one another in the area of bolt receiving eyes (28, 29) of the mast arm (2). Turntable (3) according to one of the preceding claims, characterized in that the web plates (22, 23) have at least one recess (36a, 36b) above the cover plates (26, 27). Large manipulator, characterized by a turntable (3) according to one of Claims 1 until 9 .

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