Double pump,especially for concrete transportna

PATENT DESCRIPTION

119 945

<img file="PL119845B1_D0001.tif" />

OFFICE

PATENTOWT

PRL

Additional patent to patent No. Pending: July 21, 77 (P. 199794)

Priority: 21.07.76 Federal Republic of Germany

The application was announced: 27.02.78

Patent description published: 15.01.1985 reading room

Urrędo Patentowego ql «« in |

Int. Cl.³ F04B 15/02

Creator of the invention: Patent holder: Friedrich Wilh. Schwing GmbH, Herne (Federal Republic of Germany)

Double cylinder pump, especially for conveying concrete and

The subject of the invention is a two-cylinder pump, especially for transferring concrete from a pre-filled tank, having two openings to the pressure cylinders, against which the driven distributor pipe swings, which is sealed by means of a solid plate and an axially arranged ring, preferably slidably.

In the case of such pumps, generally used for masses in the form of mash, in practice, however, mainly for transferring concrete, the concrete reaches from one pre-filled tank to one of the pressure cylinders, while the second cylinder during the forward stroke transfers its contents through the distributor pipe to the conduit discharge, attached to a pre-filled tank. The drive is used to provide kinetic energy necessary for the return movement of the distributor pipe, corresponding to subsequent pump strokes. The end of the distributor pipe from the pressure cylinder side must be sealed to prevent, especially when flowing through the discharge cylinders, especially liquid and fine-grained material components transferred between the cylinder bore and the manifold pipe. In addition, there is a danger of concrete being impoverished when handling concrete.

On one hand, the sealing should be resistant to high pressures, resulting from significant discharge heights, to which modern concrete pumps must be adapted. On the other hand, the seal must lead to a leveling of wear between the moving parts of the seal.

It is known from the German lining description DT-AS 2 104 191 to insert into the ring plate for each bore of the discharge cylinder and to position the shaft of the distributor tube in an axially adjustable way, so that the end of the distributor tube, lying on the side of the discharge cylinder, can be moved in order to leveling the defect created between the rings and the plate holes in the pre-filled tank.

While in this known device the distributor shaft's drive shaft is adjustable by means of a screwed nut, in another device of this type known from the German publication description DT ^ OiS 2 362 670 a pressure screw is used, which is located between the distributor pipe and the swinging lever.

It is also known to mount a distributor pipe at the end of the distributor tube slightly axially displaced axially and leave between the end of the distributor pipe and the fillet ring in which the hydrostatic pressure of the transfer medium affects the face of the ring and the end of the distributor pipe. Thanks to this, the distribution ring is pressed automatically to the plate, i.e. under the influence of hydrostatic pressure,

119 845

119 845 according to the resulting wear and shifts (magazine Baumaschinen-Dienst, issue 5, May 1976, p. 234).

~ "Practical experience with this kind of TFM seal shows that the operation of concrete pumps constructed in this way is unsatisfactory. On the one hand, there is uneven wear, as long as the distances traveled by the various parts when tilting the distributor tube differ significantly.

Therefore, in these cases there is a significant loss at an increased distance from the rotary shaft. This uneven wear occurs after a relatively short period of operation, as the aim is to keep the distance between the axis of rotation and the cylinder openings as small as possible. However, the wear cannot be completely compensated by axial adjustment of the ring. In addition, the distributor pipe under the influence of the hydrostatic pressure of the transfer medium, due to the flexible deformation of the pipe body and / or its bearing by the necessary clearance at the place of bearing of the distributor pipe, tilts out of the plate plane outwards.

This creates a gap that increases in the seal area remote from the rotary shaft of the drive. However, if only the hydrostatic pressure takes over the task of pressing the ring, then the ring, especially when there is a slight pressing resistance, can easily rise above the plate due to the penetration of sand or foreign bodies between both elements, which will cause seizing of the manifold pipe.

The object of the invention is to shape the seal at the end of the distributor pipe from the pressure cylinder side so that its quality does not deteriorate under the influence of deformations and shifts caused by the action of hydrostatic pressure, and that in a further embodiment of the invention it is possible to compensate the resulting uneven wear in the case of a pump in which usually used there are relatively small distances between the rotary shaft and cylinder bores.

A double cylinder pamphlet, especially for transferring concrete from a pre-filled tank, having two holes, leading to pressure cylinders, against which the driven distributor pipe swings, which is sealed by means of a solid plate and an axially located ring, preferably slidably, according to the invention is characterized by in that the ring is mounted on the tensioning device, and the end of the pipe and the ring are arranged movably with respect to each other and sealed with a sealing ring.

The tensioning device is shaped as a drive for horizontal oscillation of the distributor pipe.

The ring is pivotably mounted pivotably, the pump has pivots for pivoting ring bearings, through which the axis of rotation runs, and for pivots it has bearing sleeves in a fork lever, which is a connection with a rotary shaft.

The plugs are placed on a guide ring in which the end of the tube is axially and rotatably pivotably mounted and then sealed, the ring being supported by a guide ring.

For swiveling ring bearings, the pump has a bearing system consisting of concave and convex segments. The convex segments are located on the guide ring and the concave segments are located on the lever fork.

The ring is mounted at the end of the pipe. The pump has a frame, staggeredly mounted relative to the plate for guiding movable sealing elements, and has positioning screws for positioning the frame relative to the plate. '

The advantages of the solution according to the invention lie in the fact that even with significant discharge heights, and therefore high pressures, reliable connections between the distribution pipe and the cylinder bores are obtained and that, when using known devices and adjusting systems, the alignment of different defects and additional gaps in the seal are prevented, which would reduce its quality.

The object of the invention is illustrated in the drawings, in which Fig. 1 shows the preferred configuration of the subject of the invention in longitudinal section, Fig. 2 - the object of Fig. 1 in a front view and in partial cross-section, Fig. 3 - schematic sealing after the resulting and even defect according to the state of Fig. 1, all non-essential sealing elements are omitted, Fig. 4 - top view of the object of Fig. 3, the bearing is shown in partial section, Fig. 5 - object of the invention in another embodiment of the manifold pipe, Fig. 6 - object of the invention in a different embodiment of the manifold pipe, Fig. 7 - a different embodiment of the subject of the invention, which includes frame for pressing the wear-resistant ring, in section, fig. 8 - the object in fig. 7, in the condition of fig. 2, in view and in cross section, fig. 9 - another embodiment of the subject-matter of the invention corresponding to the substance of Fig. 3, Fig. 10 - another embodiment of the invention corresponding to the state of Fig. 9, Fig. 11 - a different embodiment of the invention corresponding to the image of Fig. 3, Fig. 12 - a further different embodiment of the invention according to the picture in Fig. 3 and Fig. 13 - a different embodiment of the subject of the invention compared to Fig. 5 in terms of ring bearings.

Fig. 1 and 2 show in cross section one of the two pressure cylinders 1. In the cylinder, the piston 2 with the piston rod 3 moves in such a way that when the piston 2 returns, the concrete can be sucked from the pre-filled tank 4, and when the piston moves forward 2, the concrete can be pushed out of the cylinder 1. The tank 4 has two holes 5 or 6, depending on the number of cylinders, as shown in Fig. 2. The pre-filled tank 4 has, according to the illustrated embodiment, a loading hopper 7 and a closed opening with a lid 8 in its lower part. Holes 5 and 6 are alternately connected to the end of the piping 9 from the side of the pre-filled tank through which the concrete sucked in by the discharge cylinders is transferred.

The required separation of concrete takes place in the S-shaped distributor pipe 10, whose end 11, associated with the pipe 9, is rotatably mounted and sealed. To this end, the end 11 is welded to the hollow cylinder 12 guided in the fitting 14, screwed to the bottom 13 and supported by the ring 14a. A seal 15 is also provided. The end of the pipe 9 is fixed with a fitting 16 and a suitably shaped seal 17 at the bearing location of the distributor pipe 10.

The pipe end 22, lying on the cylinder side, is in the form of a hollow body welded to the manifold pipe 10. The task of the hollow body is to receive two cams 18 or 19, each displaced by 180 °, which together with the slits 20 or 21 allow movable bearing of the pipe end 22 in the guide ring 23. In the guide ring 23, the end 22 of the pipe is additionally sealed by a sealing ring 24.

The leading side of the guide ring 23 carries the ring 26, which rests on the front side of the guide ring 23 and on the plate 27. Due to the fact that the guide ring 23 is equipped with two pivot pins 28 or 29, 180 ° adjusted to each other, the ring 26 can also lean so that, regardless of the size of the defect, it adheres to plate 27. For this purpose, the pivot pins 28 and 29 are housed in the pivot bearings 30 or 31 of the forked lever 32, which is fixed by means of a hitch on a rotary shaft 33 from the side of the pre-filled tank. The rotary shaft is connected by means of wedge grooves 34 to a driving lever 35, which is moved forward and backward by a motor not shown in detail 36.

Plate 27 adheres to the reinforced walls 39 of the pre-filled tank and I assume a recess to connect the connecting element 40 with the respective discharge cylinders.

In the initial phase, the parts take up the position shown in Figs. 1, 2 and 4 towards each other. If wear occurs, the seal is to be moved. For this purpose, according to the illustrated embodiment, a nut 42 is used, which is screwed onto the outer end 44 of the rotary shaft. By tightening the nut 42, the rotary shaft can move axially, and with it through the rotary lever 32 via the bearing 28-31, the guide ring 23 and thus the rod 26 moves. Because as a result of the pin bearings, the guide ring 23 can rotate together with the ring 26 about the axis of rotation running through the pivots, the position of the plane of the ring 26 relative to the plane 27 changes. As a result, it is possible to compensate for the greater wear that occurs according to the embodiment shown at the lower end of the ring, although the end of the pipe 22 maintains its original position or swings in the opposite direction under the action of hydrostatic pressure.

The mechanical adjustment shown with the nut 42 can of course be automated by the use of hydraulic cylinders or spring tensioning elements.

In the embodiment according to Fig. 5, the distributor pipe generally takes the shape of a U. At the lower arc 45 of the distributor pipe 10 there is a support 46 for accommodating a mating bearing 47, which is fixed in the lower part 13 of the pre-filled tank 4. In this way they find resistance hydrostatic, acting on the U-shaped distributor pipe 10. The other parts correspond to the system shown in Figures 1 to 4 and explained above. Only the tensioning device has been omitted.

The embodiment shown in Fig. 6 differs from the embodiment shown in Figs. 1 to 4 in that the S-shaped distributor pipe 10 is used, but it is placed in a standing manner in the pre-filled tank 4, not lying down. For this reason, the connection 40 is shaped as a 90 ° bend.

In the embodiment according to Fig. 7, the illustrated system for sealing the end 22 of the pipe from the side of the cylinder feeding the manifold 10 differs from the systems shown in the embodiments of Figs. 1 to 6. In this case, the guide ring 23 is mounted in the frame 50, and on the front side 52, however, has a ring 26. Fig. 7 shows uneven wear and thus corresponds to the state in Fig. 3.

As can be seen from figure 8, the frame shown in the embodiment according to figure 7 is adjustable by means of several adjusting screws 50a -50d (according to wear shown in figure 7 against plate 27). The guide ring 23 moves in relation to the plane of the plate and the ring 26 can move after uneven wear. On the other hand, the distributor pipe is mounted directly on the rotary shaft. A swinging bearing of the distributor tube against a rotating shaft is not necessary. Tensioning is carried out by means of setting screws 50a-50d via a 5O frame._S

In the embodiment according to figures 9 and 10 another is shown_: arrangement of pivoting pins than is visible in Figs. 1-8. The lever 32 is equipped for this purpose with a bearing consisting of concave elements 56 for receiving convex cams 57 located on the guide ring 23, the ring 26 being mounted on the front side of the guide ring 23.

The embodiment of figure 10 differs from the embodiment shown in figure 9 in that the ring 26 is located inside the pressure cylinder end 22 of the distributor pipe 10 and sealed by a ring 24a based on the extended end 58 in the shape of a hollow cylinder, ring 28 and groove 59 on the inside of pipe end 22.

This arrangement has the advantage that, compared to the embodiments of Figs. 1 to 9, it consists of fewer elements.

The difference between the embodiments of Figs. 9 and 10 and the embodiments of Figs. 11 and 12 is that the concave segments 56 are located on the guide ring 23 (Fig. 11) or. on the ring 26 and not at the end of the teeth of the fork yoke 32. Therefore, the cam 57 in this embodiment is located on the arms of the fork yoke 32.

The embodiment according to figure 13 is fundamentally different from the embodiment according to figure 5 in that the guide ring is not pivotably mounted in the lever 32, but permanently. This is basically due to the relatively large distances of the rotary shaft from the pressure cylinders 1, as well as the fact that uneven wear does not occur on the ring 26, so that despite the lack of use in the design of the joints, the ring 26 adheres on all sides to the plate 27.

The end of the pipe 22 in all embodiments of the invention in which the end 22 of the pipe is mounted in a guide ring 23 is ball-shaped. The sealing ring 24 is made of a flexible material.