DE2909256A1 - Two cylinder reciprocating concrete pump - has swivelling pipe supported in two bearings in line with each other to give clearance below it - Google Patents

Abstract

The pump has two parallel cylinders (1). A swivelling pipe (3) rotates about the axis of the discharge pipe (19) and connects each cylinder in turn to the discharge. The cylinder end of the swivelling pipe is held in a yoke (11, 12) which is carried on the end of two curved arms (8, 9). The other ends of the arms are joined to a common support piece (10.) The section of the swivel pipe (13) in line with the discharge (19) has a solid extension (16) from the point at which it starts to curve and this is joined to the support piece (10) in a bearing (17) in line with the discharge pipe.

Description

2909258

STETTER GMBH Memmingen Memmingen, d. March 5, 1979

Patent application

Control device of a multi-cylinder pump for pulpy masses

The invention relates to a control device for a multi-cylinder pump for pulpy masses such as concrete, with one inside the mass collection container arranged swivel tube that connects a fixed delivery line from alternately with the delivery cylinders about a two-cylinder pump.

There are numerous control devices for multi-cylinder pumps known, which have a straight axis or S-shaped pipe control device inside a mass collecting container is arranged, the exit direction of the conveying flow running approximately in the same direction as that of the conveying cylinder. Here, the main load is absorbed by a bearing on the bulk goods container on the discharge side.

Other control devices use angled bends which are usually arranged to be rotatable about a vertical axis so that the delivery flow is guided approximately vertically upwards or backwards via a further angled bend approximately parallel to the pump cylinders. In these solutions, the main load is absorbed by a very strong bearing under the bend or by a lighter bearing below and a second bearing, approximately 0.8-1.5 m above this and in front of the second angle bend connected to the pump cylinders Bearing plates added.

In most of these solutions there is a clearance between the lower edge of the control device and the bottom surface of the mass collector. This is where concrete sticks and hardens, so that wear and tear on the control device and additional cleaning costs arise. Since the distance is usually greater than the largest grain - for example in the case of concrete - there is of course a larger dead volume, that is, a larger residual volume that cannot be conveyed.

According to DBP 21 62 406, a control device is known in which a C-shaped pipe part at the top of the rear wall of the mass collecting container with an axis of rotation running approximately parallel to the pump cylinder axes is stored. Here the rear wall of the bulk container is used as a storage console. The shear forces in the horizontal direction are received via a flat plain bearing and tie rods, which are connected to the delivery cylinders. Inside the C shape

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if there is no free force in the vertical direction, the resultant in the two elbow parts almost cancel each other out.

> - | It is also known a control device in which the forces

from a bearing, which is above the delivery cylinders, and a 2.

Bearings in the rear wall of the container, are included during the 180 pipe bends outside or on the one from the delivery cylinders * turned page is completely free.

These two solutions also have the disadvantage of solidifying the Concrete between the pipe and the tank bottom and the large dead volume.

A design of the control device according to the invention avoids the disadvantages of these last two solutions in the following way:

The load is not supported on the rear wall of the waste collection container but over two arms, which at one common the same bearing housing of the delivery cylinder, on whose common front

'jsj plate, or articulated on the cylinders themselves spread and on the

Il the side facing away from the delivery cylinders extends to about 0.8 - 1.2 m

Unite elevated bearing console. Arms and bearings are dimensioned so that tilting moments around a vertical axis and impact forces be recorded in the conveying direction or in the longitudinal direction of the conveying cylinder.

This spatial support frame is articulated on one side Supported delivery cylinders and has a bracing on the opposite side. The joint axis lies in the parting plane or the plane of the main wearing parts.

The space between the two arms is created by a spatially curved, Wear-resistant, downwardly hinged emptying flap closed.

The bearing at the raised upper end of the arms accommodates the rotatable discharge pipe, which runs parallel to the feed cylinders, continues as a 180 ° bend up to the end face of the delivery cylinder and either near the rear wall of the mass collection container or is stored a second time at a distance of 2 - 4 m from the external warehouse. I.

This manifold pipe is alternately I with its lower end

pivoted in front of one or the other delivery cylinder.

The shear forces which, due to the separation point, to the 180 ° Elbow pipes are created, are taken up by the external warehouse.

Such a control device makes it possible to control the flow rate with truck-mounted concrete pumps in the smallest space and with the lowest internal deformation resistance in the direction of such pumps

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to always lead the necessary placing boom.

The outer contour of the manifold pipe is provided with scraper lugs over at least 35 - 60% of the circumference of the outer bearing, which during their pivoting movement against the Bodenverschi u.ßplatte or further against its closed extension to the outer bearing only have a small distance of approx. 0.5-2 mm.

If the discharge pipe is removed from the external storage area on the feed side stored, so is a bending and torsion-resistant connection behind the inner wall of the between this and the swivel pipe bend Bulk collection container required.

The adjusting force is expediently from the outside, i.e. the the side of the bearing arms facing away from the delivery cylinders.

Set in another embodiment of the subject matter of the invention the bearing arms continue in the area above and within the delivery cylinder and carry a second bearing there. The adjustment force is then introduced directly next to the bearing. Behind it in the conveying direction is the rotary coupling, which is the stationary one Conveyor pipe connects to the movable elbow pipe.

For pumps whose working pressure is between 50 and 100 bar, it may be necessary in order not to have to make the support arms of the outer bearing and the connecting parts between the control device including the mass collecting container so difficult to divert the thrust forces, for example by installing a connection between the inner bearing and the conveyor cylinders.

After swiveling away the control device / mass collection container part The front wear plate on the manifold pipe and the wear plate opposite it in front of the delivery cylinders are up to about 90 immediately accessible. In addition, the delivery piston can easily be viewed from the front and replaced if necessary.

The support arms are preferably designed as hollow arms and inside, lower area se that a plant of the wear-resistant bottom closure plate is guaranteed on all sides. The contact surface can be made of metal in the form of a labyrinth or with an elastic seal.

It is also possible to mount the base plate on the joint side for example by eccentric bushings, on the clamping side for example by adjusting pins adjustable in the vertical direction.

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The outline of the bottom closure plate is larger than the outer contour of the swiveled-out swivel pipe elbow or its stripping lugs and the shape of the inner sidewall is c'er arms arched inward as an extension of the lateral surface, so that between the cutting edge of the stripping lugs and the inner surface the hollow arms create an angle of at least 150 and no material to be conveyed solidifies between the angle bend and the support arms or wedged.

In the area between the bottom closure plate and the outer bearing of the control device, the space between the swivel pipe bend can have the outer contour and upwardly converging support arms be closed, for example by wipers that are attached to the pipe itself and end at the closed wall, or it can, provided with a larger fillet, remain open.

The bulk collection container only rests on the two arms.

In the case of a solution with a second bearing arranged on the rear wall of the container, the rear wall of the container can also rest against the bearing foot.

Both bearings of the control device are designed in such a way that after loosening a few screws they can be lifted off together with the swivel pipe elbow.

The agitator shaft is split in two. Both halves are under the Swing pipe elbow coupled with mechanical means.

Another feature of the invention is the design of the wearing parts to see at the point of separation between the conveyor cylinder and the control device.

After the greatest wear on both facing end faces arises in the center of the axis, and n ^ .ch decreases above and below, it has proven to be advantageous to increase the surface area of the sliding surfaces adapt to the local wear size, d. H. At the end of the manifold pipe, the ring cross-section is larger at axle height than above and below. This widening is also tapered at an acute angle as a knife edge. The fastening screws are above and below.

The wear plate is not on the front plate of the delivery cylinder rectangular closed, but shaped like glasses. The area between the cylinders is made of more wear-resistant material than the outer parts.

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Instead of a three-part wear plate, it is possible to use a single one Provide plate and design this in the zone between the cylinder openings with a different hardness or with a higher wear value.

In this way, the face plates wear out evenly over the entire vertical contact surface and replacement is more difficult often required; In addition, more or less conveyed material or fine material does not escape locally, for example when conveying concrete and it can can be worked with higher pressures.

The following representations show examples of the subject matter of the invention, namely:

Fig. 1 shows a control device in vertical section, the storage of the swivel pipe bend is located at the front and rear container wall and both bearings are part of the pivotable overall arrangement. The coupling between the pivotable Krumme r pipe with drive and the discharge pipe are located directly behind the inner bearing.

Fig. 2 is a control device in vertical section, the rear

Storage is further away from the front, the manifold pipe with a flexurally and torsionally rigid coupling behind the Container and the rotary coupling is located behind the inner bearing, and after releasing the flexurally and torsionally rigid coupling Swiveling away from the mass collecting container and control device is given.

FIG. 3 shows the top view of FIGS. 1 and 2

Fig. 4 shows a vertical section through the support arm. «And the bottom closure plate in the vicinity of the separation point with a view the delivery cylinder.

Fig. 5 show an example of the formation of the front wear

and 6 plate on the feed cylinder side in front view and

in vertical section through the middle

Fig. 7 show in front view and horizontal section the erfindungsu. 8 proper design of the front wear plate on the swivel tube elbow in front view and in plan view,

9 show the design of the floor wear plate in frontal view. 10 looks in the direction of the delivery cylinder and in vertical section

through the longitudinal center.

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Fig. 11 shows the overall structure of a stationary pump with the control device according to the invention and finally

12 shows the structure of a pump according to the invention, as a concrete pump on a three-axle truck chassis.

The pump device according to Fig. 1 consists of the two delivery cylinders 1 with flushing water tank 2 and the hydraulic cylinders 3. This delivery cylinder 1 can be in a frame not shown be stored and carry an end connection plate at least on the suction side 4, which in turn is provided on one side with bearing eyes 5, the axis of which is preferably perpendicular to the axis of the Delivery cylinder 1 runs. On the opposite side is a clamping device consisting of a pivotable clamping bolt 6 and a clamping nut 7, present.

The support arms 8/9 connect to these bearing and clamping parts and arch upwards in the front, in order to unite there in a storage console 10. On the delivery cylinder side, the support arms are expediently connected by an upper and a lower yoke 1 l / l2, so that a passage for the swivel pipe bend is created, slightly larger than the envelope curve of the swivel pipe bend 13. Area A between the support arms 8/9 is closed by a base plate 15 which can be folded down by 14.

The control device consists of a 180 pipe elbow 13, the one axis runs at a distance from the axis of the conveyor pipe and the other coincides parallel with the axes of the conveyor cylinder 1.

The elbow part on the discharge pipe side is seated with a pin 16 beyond the outer contour of the bend and is in the transverse and Longitudinal bearing 17 held.

With 18 the inwardly continuing and there forming a plate-like support arms are identified. A second bearing 19 for the swivel pipe bend 13 is placed on this support foot 18. The Schwenkrohrkrümmer 13 is now connected by means of swivel coupling 20 with the rigid discharge line 21 and the pan ^[<l lever 22 by a support leg 18 is supported on the hydraulic cylinder 23

* | pivoted. Axial wear readjustment at the point of separation

The swivel pipe elbow / conveyor is carried out from the external storage area 17.

Via tie rod 24, cross yoke 25 with clamping nut 26 can be used when working

the load on the support arms and joints is relieved with higher delivery pressures.

The mass collection container 27 is provided with a frame 28 and

r the cylinder jacket-shaped wall rests on the support arms 8/9 and on

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Support foot 18 on. The agitator axis is designated by 29. The rejuvenation the line cross-section is in a known manner in the swivel pipe elbow itself or in a subsequent pipe section relocated.

In an embodiment according to FIG. 2, only the support 18 and thus the second bearing 19 is located remotely. In order to be able to pivot the mass collecting container 28 with the control device, between Swivel pipe elbow 13 and discharge pipe 21, a coupling 30 is required.

The introduction of force for pivoting takes place here from the hydraulic cylinder 23 via lever 22 from the feed side.

The top view of Fig. 3 shows the course of the support arms 8/9 more clearly From the bearing and clamping point 5,6,7 to the front swivel bearing, the swivel pipe elbow assembly is used with bearings and a mass collection container swiveled away after the dash-dotted line, then the front wear plate 46 is on the swivel pipe bend 13, the end wear plate 40 on the end face of the feed cylinder 1 and the end face of the feed piston 34 easily accessible.

Fig. 4 shows how the support arms 8/9 are connected to one another in the front connection part by an upper and lower yoke 1 l / l2. Along the inner contour B (the top view) is a contact surface 35 for the bottom cover 15 is formed. The inner surface of the The bottom cover merges into a smaller circular arc C. Between the stripping nose 36 on the pivot tube 13 and the tangent an angle pCS 60 is created. The end of the The swivel pipe elbow extends through the upper and lower yoke 11/12 to the end wear plate of the cylinder, with there is a distance D of approx. 50 min between the movable and the fixed part.

The support arm cross-sections taper towards the top and merge into one another.

The upper surface 37 of the support arms form the support for the mass collection container (27). Both support arms can also be designed as an open profile with a corresponding section modulus.

At the lower cross yoke 12 are bearing eyes 38 for the bottom cover 15 attached.

The wear glasses Fig. 5 in front of the cylinder openings consisting of The x-shaped inner part 40 and U-shaped outer parts 41 are held with screws 42. The inner part is made of more wear-resistant material manufactured as the outer parts, the hatched area 43 of

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is set back approx. 2 mm. The wear center piece is supported on the Außenver wear plates 41 from. The outline of the wear glasses thus forms approximately ellipses with respect to the cylinder center. The increase in area in area E compared to F achieves that the entire face wears evenly. The wearing parts are designed so that they can be turned 180 degrees can.

Fig. 6 also shows how the bottom plate 15 with its End face 44 comes to rest on the lower yoke 12 via a seal 45.

In the same way, the end wear plate 46 is also on the swivel pipe bend 13 designed elliptically and held in the zones F of lower wear volume by means of 47 screws - Fig. 7 This wear plate 46 is shaped at least in the lateral area in such a way that an acute angle / 5 is formed to the foremost end face. In the lower area, noses 48 are machined as blade scrapers against the bottom cover plate 15 and they agree with the contour the stripping lugs 36 of the swivel pipe elbow - FIG. 8

As a modification of this version, it is also possible to use the swivel pipe elbow insert a concentric, possibly compressible, highly wear-resistant ring.

8 and 9 is a spherically curved one Part with an edge reinforcement 50 the front bearing eyes 51 and the upper clamping claw 52. Due to the curvature on all sides, the plate is inherently very rigid.

The core of the floor wear plate can be made from a pressed perforated plate exist. The inner surface forms the contact surface with the scraper edges 36 of the swivel pipe elbow. A vertical wear readjustment is achieved by eccentric bolts 52 below and by contact bolts 53 above. This reenactment can also be reached by other means. The stripping lugs 36 can extend from area A to the upper transverse and longitudinal bearing 17 continue.

A two-cylinder pump, especially for concrete for stationary use, is expediently constructed according to FIG. The swivel pipe bend 13 is provided with a radius R, which is so large that the drive motor 55, hydraulic system 56, hydraulic control 57 and compressed air or pressurized water system 58 in the room between the pump cylinders 1 and the discharge pipe 21 to be

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bring the whole unit on rigid or adjustable supports 59 is released.

Such built concrete pump is feed end completely free of tubing after pivoting away of the mass collecting / Schwenkrohrkrümmer component of the wear-conveying cylinder can after the object side in a known "manner are removed. The dead volume, shown by the broken line in the mass storage tank, is smaller than in the embodiment according to DBP 216 24 06.

In the case of mobile concrete pumps, the pump unit must be installed at a certain incline (f ) because of the drive, suspension and transverse reinforcement parts 60 in the chassis frame 61 The design of the control device as a swivel pipe bend with an external bearing and a second bearing, which is pulled far back, together with the swivel drive, satisfies this requirement in a favorable manner.

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Position overview

1 delivery cylinder

2 flush water tank

3 hydraulic cylinders

4 front connecting plate

5 swivel joint

6 clamping bolts

7 clamping nut

8 support arm

9 support arm

10 storage console

11 upper yoke

12 lower yoke

13 swivel pipe elbow

14 bearing eye

15 bottom cover plate

16 tenons

17 longitudinal and transverse bearings

18 support leg

19 transverse bearings

20 rotary joint

21 discharge line

22 swivel lever

23 hydraulic cylinders

24 tie rods

25 cross yoke

26 clamping nut

27 Bulk Collection Container

28 frames

29 Agitator axis

30 clutch

31 32

33 Contact sealing surface

34 End face of delivery piston

35 contact surface

36 wiper nose

37 upper support surface

38 bearing eyes 39

40 Inner part wear glasses (delivery cylinder)

41 outer part

42 screws

43 Recessed surface

44 front face d. Bottom cover plate

45 seal

46 Front wear plate (swivel pipe elbow

47 screws

48 noses 49

50 edge reinforcement

51 bearing eyes

52 eccentric bolts

53 Contact pin 54

55 drive motor

56 hydraulic system

57 Hydraulic control

58 Pressurized water system

59 Adjustable support

60 cross bracing parts

61 chassis frame

A opening between the support arms downwards

B B Contour of this opening in plan view

C Arc curvature in support arms

D Distance from envelope curve swivel pipe elbow to upper and lower cross yoke and transition of the cross yokes in the support arms

E Area of wear surface in swivel pipe bend axis, middle area 030037/04

Area of wear surface above and below

-j Floor scraper on the swivel pipe bend

Face cutting angle horizontally

Wear plate swivel tube elbow

& ■ Installation angle pump in chassis J " ground clearance angle

Claims (9)

f * t t Λ «- '· * · t · β STETTER GMBH Memmingen M * emmingen, d. March 5, 1979 Claims Control device of a multi-cylinder pump for pulpy masses, such as concrete, consisting of a mass collecting container and in this arranged swivel tube, which is connected by means of a rotary tube coupling to a delivery line from and its the other end is pivoted alternately to one or the other delivery cylinder, characterized in that the bearing of the swivel pipe bend (13) in the transverse and longitudinal directions and the load absorption essentially takes place via a spatially curved triangular frame part (8/9 / ll / l2), one side of which has a joint (5) on the front ends of the delivery cylinder (1 ) whose other side is provided with an easily detachable clamping device (6/7) at the ends of the feed cylinder and on the raised third point of which one of two bearings (17) is arranged for a 180 pipe bend , one fixed to the Elbow pipe connected bearing journal (16) with the axis of the discharge side Tube (21) collapses and the space inside and below the triangular shaped part at least in area (A) From about 30-50% of the area of the 90-angled component enclosing the three points, one can be folded down and viewed from above with the outer contour of the swivel pipe bend identical, easily detachable and wear-resistant plate (15) is closed, which the contour of the stripping lugs (36) of the swivel pipe elbow (13) with a gap smaller than approx. 2 mm. 2. Control device according to claim 1, characterized in that the support arms (8/9) from the joint and wear side to I ten and continue above and a bearing foot (18) for a second bearing I (19) of the swivel pipe elbow (13), the drive of the Swivel pipe elbow (13) takes place via lever (22) and hydraulic cylinder close to the bearing foot (18). 3. Control device according to claim 1, characterized in that a second bearing (19) of the swivel pipe elbow separate from the support part of the bearing (17) is arranged approximately above the feed or hydraulic cylinder (1/3) of the feed pump, between these bearings In the vicinity of the bulk container rear wall, a quick coupling (30) between the pipe elbow (13) and the discharge pipe (21) for the purpose of Pivoting the mass container / control device unit is arranged and wherein the drive of the swivel pipe bend (13) -2- 030037 / OA68 • ft ·· ι via the bearing journal attached to the swivel pipe elbow (16), swivel lever (22) and hydraulic cylinder (23). 4. Control device according to the preceding claims, characterized marked that the one provided with the swivel joint (5) and bracing device (6/7), tapering towards the bearing bracket (10) and approximately upwards Right-angled support arms (8/9) on the underside with contact sealing surfaces (33) or sealing edges, on which the corresponding bottom plate (15) come to rest and the floor wear plate in the case of contact surfaces provided with a seal, can be readjusted in the vertical direction via an eccentric bolt (52) and a contact bolt (53). 5. Control device according to the preceding claims, characterized marked that the stripping lugs (36) of the swivel pipe bend (13) sliding on the bottom cover plate (15) extend beyond the area (A) continue up to the pivot bearing (17). 6. Control device according to the preceding claims, characterized in that to relieve the swivel bearing (5) and bracing (6/7) the support part (8/9/18) for both bearings (17/19) of the swivel pipe bend is braced against the delivery cylinder (1) by means of tie rods (24). 7. Control device according to the preceding claims, characterized in that the end face of the swivel pipe bend on the delivery cylinder side is protected by a wearing part (46) whose ring width in the middle or axis area (E) is greater than above and below, and at least in area (E) on both sides a cutting edge of approx. 45-70 ° is formed, which in the lower area in the stripping lugs (36) of the swivel pipe elbow (13) passes over. 8. Control device according to the preceding claims, characterized in that the front wear plate on the feed cylinder side of three Parts consists, a more wear-resistant middle part (40), the outline of which is preferably X-shaped, that is, that the contour around the Delivery cylinder axis elliptically inwards to a central fastening screw (42) runs towards the surface (43) between this contour and the upper edge and the lower edge of the conveyor pipe-0 is set back about 2 mm and this X-shaped component is at the top and bottom, if necessary, against the less wear-resistant outer wear plates (41) is supported. 030037/0468 -3- fcv · * ■ ♦ ··> »· ■ · ft · ο «β I · · f ο · 9. Control device according to claim 8, characterized in that the end wear plate (40/41) on the feed cylinder side is made in one piece, but in the shape of glasses, the zone (E) between the feed cylinder openings being more wear-resistant than the upper, lower and outer zones (F). 030037/0468