DE1805972A1 - concrete pump - Google Patents

Description

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* Patent attorney, '-

Wn ₈ -H. PFISTER- 2aOKl! 968 MEMMINGEN / BAVARIA

Mr. Georg Stetter, 894 Memmingen, Strigelstrasse 5

concrete pump

The invention relates to a pump for concrete, mortar or the like.

They are hydraulically driven piston pumps for conveying
Concrete, mortar or similar substances known. The piston of these pumps sucks in the material to be conveyed and pushes it into a pressure line that leads to the processing point. To control the suction and pressure cycle, slide designs are known »the a.ls flat

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slide, rotary slide or piston-shaped slide

can be formed. During the suction stroke, the piston sucks

Goods to be transported from an inlet device to »which preferably,;

is designed as an inlet funnel with storage container. The |

The piston pump is usually started with a horizontal central axis

arranges and it is clear that da.V with the suction cycle that from the inlet.

device in the pump cylinder flowing transport goods right-. ,

must be deflected at an angle · The transported goods must therefore more · ί

or be deflected less sharply. ^ ■!

In order to achieve an approximately uniform conveyance of the transported goods in To achieve the pressure line, it is advisable to provide at least two pump cylinders, the pistons of which work in opposite directions. this but means that in "the known constructions first the flow of the transported goods coming from the filling opening is divided into two individual flows, which alternate with the one or the other pump cylinder can be initiated. In the pressure line the individual streams are brought together again.

Due to the necessity of a plurality of pump cylinders with associated control slides for the inlet and outlet, the inevitable diversion of the direction of the flow of conveyed goods and the goods being transported which, on the one hand, cause wear and tear, on the other hand are poorly pumpable and tend to become clogged, there are many tasks that are only partially solved in the known constructions. A major disadvantage of the known proposals consists in the relatively high wear and tear, in the fact that the pumps are often difficult to clean, in the poor efficiency of the pump and in the relatively high expense of replacing worn parts The arrangement of the slide directly on the cylinder often appears not / possible, so that because of the "distance" between the control slide and the cylinder, an unfavorable volumetric efficiency is obtained.

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The amount of concrete between the cylinder end and the slides will be j

only moved back and forth, but not further promoted. Also loading!

most pumps sit in unfavorable suction conditions. The be j

special type of goods to be transported and also the unfavorable volu- j

metric efficiency means that the negative pressure in the suction ₍

good results in little promotion. The amount of cargo in I

the inlet device, in particular in the inlet funnel:

however, it is limited. Concrete pumps of this type are usually on;

Vehicles arranged, so that for this reason alone the construction j

height of the inlet funnel is limited. For reasons of work- j

It is also not possible to expire a sufficiently large;

Amass amount of transported goods, so that the T & nsportgut the \

Suction stroke flows slowly into the cylinder. This gives partially!

poor flushing and, on the other hand, limits the pump; (

frequency * i

• *

The large distance between the slide and the piston also means that a large, already compressed volume occurs with each return stroke
is relaxed again, which also has a negative effect on the efficiency.

The invention has set itself the task, in particular the "*""
To improve the efficiency of the pump, but also beyond that
reduce the wear per se or the arrangement in such a way
to ensure that wearing parts can be replaced quickly.

The invention is based on a pump for concrete, mortar or
Like. With a movable pump piston in a cylinder, a
Inlet device, in particular an inlet funnel with a storage container, a pressure line and a Steuerschleberein device in the connections between the cylinder, the inlet device and the pressure line. The * invention is in the first place
Line marked by a rotary valve for optional
Connection of the cylinder with the inlet device and the pressure

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line, which rotary valve has at least one channel designed as a pipe bend and where the axis of rotation of the rotary « The slide runs perpendicular to the direction of material flow.

The invention is based on the consideration that in a pump with a pump piston moved in a cylinder, the deflection of a flow of conveyed material is unavoidable, otherwise a pump cannot be implemented on this basis. If, however, the deflection of the flow of conveyed material, for example a pipe bend or the like, is brought into the immediate vicinity of the pump cylinder, the amount of material moved back and forth, but not conveyed, can be reduced to a minimum. If further, as proposed in the invention, the pipe elbow is combined with the slide in the form of a rotary slide, the entire paths, in particular between the inlet device and the cylinder, can be reduced so much that the degree of filling is also favorable "^;

Since the invention tube-like spacers between your slide and avoids the pipe elbow or these parts and the cylinder, cleaning is also simplified. and the number of parts to be cleaned is few «If, for example, the rotary valve housing is expanded are the cylinder and also. the inlet device is directly accessible This means that in turn, the exchange option beiia replacement of seal Share improved. . ,. .

In the embodiment of the invention it is provided that the rotary slide valve has two channels, one channel in one slide position serving to connect the inlet device to the cylinder and the other channel in the other slide position serving to connect the cylinder to the pressure line. This arrangement of 2 channels in the same rotary valve has considerable advantages: it is possible to adapt each channel end to a specific connection, which results in more favorable channel cross-sections or flow ratios.

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\ can be held.

For example, the invention proposes that the connecting channel between the inlet device and the cylinder is designed as a pipe elbow * while the other, the Cylinder with the pressure line connecting channel a substantially has straightforward training. In general, the. Cylinder be arranged essentially horizontally while. the opening of the inlet device into the valve housing is directed downwards. ' During the intake stroke, the conveyed material is deflected approximately at right angles, while it can be conveyed in a straight line during the printing cycle.

Particularly favorable conditions are obtained when the central axis of the cylinder and the central axis of the inlet channel of the inlet device opening into the slide enclose a smaller than a right angle, in particular an angle of about 70 degrees. The required slider movement at the moment of reversing can then also be smaller than a right angle. However, the design has a particularly favorable effect with regard to the cylinder arrangement. Here the invention proposes that the central axis of the cylinder encloses a small acute angle with the horizontal and that the rotary valve is set directly to the lower end of the cylinder. This provides an overall arrangement in which the rotary valve the. occupies the lowest position. The opposite end of the cylinder is raised slightly, which means that the ground clearance that is important for the drive elements of the pump piston in the case of training as a road vehicle: 'is obtained. But since the rotary valve has the lowest position in the ■ invention, is the most optimal size of the inlet funnel? obtained, whereby ^: favorable conditions are given especially during the intake stroke.

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The rotary valve is preferably fold in the invention **! well trained. The channels of the rotary valve are thus

on the one hand from the rotary valve itself and on the other hand from the '

Rotary valve housing limited. Such training results in>

benefits not only in production. It can be preferential · j

easy to clean and the number of wear and tear

set control edges of the rotary valve is low. <

According to a further feature of the invention, the t Cylinder leading connection in the rotary actuator housing a;. rhombic cross-section .. Aichdie with this connection together "j acting ends of the two rotary slide channels are these Rhombus shape adapted. The rhombic shape of the control edge on the rotary valve and the opposite edge on the rotary valve housing has different effects Closing process is reduced more slowly. The process of closing - * - The process adapts itself well to the resistance that results from the closing movement. While at relatively large, open cross-sections stones can still move well to the side and will also move quickly, takes the Clamping effect and thus the resistance towards the end of the closing process. Towards the end of the closing movement, any jammed stones will be smashed "

The invention also suggests that only those rhombus corners on the rotary valve and the rotary valve housing that Control the end of the closing process, provided with armor are. The armoring of all control edges is not necessary for the reasons mentioned above, without affecting the service life would be reduced. -. · "

The invention also provides that the 'sealing on the housing A plurality of surfaces of the rotary valve that are parallel to one another

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or have concentric notches. These notches are grounded in operation quickly add fine concrete so that the interacting surfaces of the control spool and the housing are protected from metallic wear. Even a good seal is obtained, since the notches give the effect of a labyrinth seal. ·

It is advisable to make the arrangement such that the Rotary valve with its housing can be swiveled away around a preferably vertical axis in order to make the cylinder and the rotary valve accessible for cleaning *

It is clear that the invention in itself applies to a cylinder can be realized with a pump piston. Is cheaper However, if a reciprocal number, in particular 2 pump cylinders, are arranged next to one another, the funp pistons of which are driven in opposite directions. In general, the pump piston movement is derived from a common drive. It is advantageous to have a special one for each pump piston Inlet funnel is assigned «In particular, the invention provides that here the rotary valve / each cylinder has a special drive. Such a «training. facilitates the above-mentioned swiveling out of the rotary slide housing.

In the drawing is an embodiment of the invention with further advantageous features shown schematically. Show it:

Fig. 1 is a side view of the essential parts of a

Required concrete pump in the operating position,

2 shows an enlarged illustration of part of the figure. position of Fig. 1,

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■ "1605972

3 shows a rear view of a road vehicle with a concrete pump according to the invention in the transport station, lung,. .

4 shows an enlarged illustration of a detail of the Representation of Fig. 3 »

5 shows a longitudinal section through the rotary valve with the rotary valve housing the pump according to the invention and

Fig. 6 shows a cross section according to the section line VI -... VI of Fig. 5. '. '

The illustration of Figures 1-4 show that the. Concrete pump essentially consisting of the cylinders 1, the control slide devices 2 and 3 and the inlet device 4 consists. In the drawing of Figures 1 and 2 there is only one cylinder 1 visible, which is assigned to the control slide device 2

is arranged. Control slide device 3, however, has one similar pump cylinder, which is arranged parallel to the pump cylinder 1. The concrete pump is on the frame 5 of the vehicle 6 attached and that appropriate at the middle end, so that the essential parts of the concrete pump that require maintenance are easily accessible. ,

The inlet device 4 consists essentially of the storage container 7 and the inlet funnel * 8 «The storage container? can be made even larger than shown in the drawing. The smaller training is recommended, however, if the storage container is to be charged directly from a car mixer. .

The inlet funnel 8 is designed in two parts · The upper one

X The ·

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Part 9 is firmly connected to the storage container 7, while "the lower part 10 is attached to the valve housing II Inlet channel is formed. The parting line 12 is inclined in order to enable the rotary valve housing to be pivoted away. The seal is preferably made by a rubber seal or the like.

The connection 13 of the rotary valve housing leading to the cylinder 11 is kept very short and is just sufficient, the opening 1 * 1 in the cylindrical rotary valve chamber 15 a to give rhombic shape, or the corresponding transitions bring about. The pump piston of the cylinder 1 is not shown in detail. Its stroke extends to the parting line between cylinder 1 and valve body 11.

The rotary valve 16 has essentially the shape of a Flap that can be rotated about axis 17. For tax movement of the rotary valve, the crank 20 is clamped onto the square end 18 of the rotary valve shaft 19, to which the piston rod 21 of the control cylinder 22 engages. This The control cylinder can be pivoted about the joint 23 and the pivot bearing 24 is supported on the support element 25, which together with the rotary valve housing 11 and the base 26 and the cover 27 of this housing can be pivoted about the axis 28 is. As a result of this pivoting movement, both the connection 13 and the inlet channel 10 are accessible, the same the cylinder and the piston and also part 9 of the inlet funnel. If necessary, the piston seal can be replaced, blockages can be removed and It is also a check of the cylinder surface, the rotary valve and the inner surface of the valve body.

In the operative position engages the ¹ about the pin 42 (Fig. O of the spool valve device 2 movable plate 43 via the bolt 44 of the device 3, thus securing the operating position.

As mentioned, the rotary slide valve 16 is designed like a flap, it thus separates the h g ^ the I | il | 29 and 30 of each other. Of the

Channel 29 is designed as a pipe bend and functions during the intake stroke in which the inlet channel Io is connected to the cylinder. The other channel 3o, which is inoperative in the illustration in FIG. 6, which shows the intake stroke , connects the cylinder with the pressure line 31 (FIG. 1 ) or the connection piece 32 for this pressure line during the pressure stroke. The central axis 33 of the inlet channel forms an angle of approx. 70 degrees with the central axis 3 * t of the cylinder and the channel 29 is suitable, curved, in order to bring about the shortest possible connection without any significant change in cross-section. The canal 30, on the other hand, is only slightly curved. The central axis 35 of the connection piece for the pressure line is only slightly offset from the central axis 3 * 1 of the cylinder and the channel Jo compensates for this offset.

It should be noted that those two ends of the channels 29 and 3o which are assigned to the control edge 36 of the rotary valve 16 are adapted to the rhombic shape of the connection 13. This adjustment is ./deutlich. "In FIG. 5 indicate that makes particular adaptation of the corresponding end clearly the Ka-dimensional 3o.

The cooperating control edges are provided in connection 13 with ) the armor 37 and in the rotary valve with the armor 3B. On all of its outer surfaces, the rotary slide valve has notches 39 which run parallel to the axis of rotation 17 . The notches, on the other hand, which are arranged in the surfaces ¹ Jo and 41 (FIG. 5) , "run either straight, or are curved in such a way that a seal in the manner of a labyrinth seal between the channels 29 and 30 is obtained ν

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Claims (1)

Patent claims 1. Pump for concrete, mortar and the like with a Puap piston movable in a cylinder, an inlet device, In particular an inlet funnel with storage container, a pressure line and a control slide device in the connections between the cylinder, the inlet device and the pressure line, characterized by a rotary valve (l6) for the optional connection of the cylinder (1) with the Inlet device (4) and the pressure line (31), which The rotary valve has at least one duct (29) designed as a pipe bend and wherein the axis of rotation (17) of the rotary valve runs perpendicular to the direction of the material conveyor. Hr 4 « 00982W0615 | 3t im »> o * iii» (Ut www I mi OfiiMi— »|> BATH c - 2. Pump according to claim 1, characterized in that the rotary slide valve (16) has two channels (29, 30) and the one channel (29) in the one slide position of the connection between the inlet device (J)) and the cylinder ( %) and the other channel (30) is used in the other slide position to connect the cylinder (1) to the pressure line (31). 3. Pump according to one or both of the preceding claims, characterized in that the connecting channel (29) between the inlet device and the cylinder is a pipe bend is formed, while the other connecting channel (30) between the cylinder and the pressure line one has substantially rectilinear training. k. Pump according to one or more of the preceding claims, characterized in that the central axis (34) of the cylinder is at a smaller than right angle, in particular an angle of Include 7o degrees. 5. Pump according to one or more of the preceding claims, characterized in that the central axis of the cylinder (1) encloses a small acute angle with the horizontal and the rotary valve (16) is arranged directly at the lower end of the cylinder. \ 6. Pump according to one or more of the preceding claims, ^ characterized in that the rotary valve (16) is designed like a flap and the channels (29} D) of the rotary valve * are thus limited on the one hand by the rotary valve itself and on the other hand by the rotary valve housing (11). '- 3 -009824/0616 7. Pump according to one »or more of the preceding claims» . characterized by »that the one leading to the cylinder Ci) Connection (13) i »rotary valve housing (Ii) a rhombic one Has cross section and that cooperating with the connection Ends of the rotary valve channels (29. 30) of this Raombusform are adapted. 8. Pump according to one »or more of the preceding claims» characterized in that only those rhombus corners on the rotary valve and on the rotary valve housing, which is the end control the closing movement * with armor (3 ?, 38) are provided. 9. Pump according to one or more of the preceding claims » characterized in that the surfaces (40 »Ii) of the rotary valve sealing the rotary valve housing (11) have a plurality mutually "parallel or concentric notches (39) exhibit. ". 10. Pump according to one or more of the preceding claims » characterized »that the rotary valve with its housing is pivotable about a laterally arranged, preferably vertical axis (28). 11. Pump with two parallel cylinders and one Purapkolbea each, the movement of which is derived from a common drive, characterized in that the rotary slide valve (16) each Cylinder has a special drive. 12 »Pump according to one or more of the preceding claims» characterized »that the storage container (7)« it each an inlet funnel (8) is connected to the rotary valve housing (11) of each cylinder (1). / The 00 9824/0615