DE2421322A1 - PUMPING DEVICE FOR PUMPING CONCRETE OR OTHER MATERIAL - Google Patents

Description

Pumping device
for pumping concrete or other material

The invention relates to a pumping device for pumping concrete or other material, with a pump tube arrangement, a variable-volume pump chamber with a material inlet that can be connected to a material container and forms a material outlet which is located at a distance from this and can be connected to a material conveying device an inlet valve with which the connection between the material inlet and the material container is interrupted as required can, and with an outlet valve with which the connection between the material outlet and the material conveying device can be interrupted as required.

The invention is directed in particular to pumping concrete, but is not limited to this application .

The pumping of concrete has become relatively common, especially in the construction industry, where it is, for example

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when building multi-storey buildings for a transport mixer it is difficult to get to the construction site where concrete is needed. Concrete pumps have to be used after pumping Concrete filling is flushed out to the pump and the connected delivery lines for the next pumping process keep free. Concrete pumps are usually placed on a suitable truck so that they can be driven by a Construction site can be transported to the other. Quick cleaning of the pump and the connected delivery lines is therefore useful in order to be able to utilize the pump to the maximum during a given period of time.

A known concrete pumping device or concrete pump has a cylinder-piston unit. During a filling stroke, while the piston goes back to suck concrete into the cylinder, the cylinder is connected to one via a valve Filling funnel connected. Then the valve is closed and the piston is pushed into the cylinder with force, to expel the concrete. This device is relatively difficult to clean and to replace or maintenance of worn or damaged parts is difficult.

When pumping an abrasive Gemiseh, like e.g. of concrete, the wear resistance of the pump parts is an important factor in the acquisition costs for the pump and for the economical operation of a pumping system.

Another known concrete pump has a hopper connected semicircular flexible pipe. The concrete is pumped by squeezing it of the tube in a similar way to squeezing toothpaste out of a tube with rollers around the semicircle hike. The flexible tube of this device is subject to considerable internal wear, its maintenance can therefore be relatively expensive.

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The invention is based on the object with simple Means an economically producible pumping device for pumping concrete or other material of the initially to create mentioned genus that can be cleaned without difficulty.

According to the invention, this object is achieved in that the pump tube arrangement is at least two relative to one another Has telescopic pump tubes in their telescopic Relative movement can be driven by a drive to the pump chamber with the inlet valve open and closed exhaust valve during each filling stroke and with the exhaust valve open and closed To reduce the size of the inlet valve during each exhaust stroke.

Preferably, both the inlet and the outlet valve have a flexible pipe section and a shut-off device, with which the flexible pipe section compress to close the associated valve as required lets on. Each shut-off device preferably has a pair of Abklemmteile on both sides of the arranged flexible pipe section and are adjustable with relative movement against each other to the flexible To squeeze pipe section between you. The pinch-off parts can be designed as pinch rollers. At this relatively simple arrangement, there are no parts that come into contact with the material could clog, and the exposed pipe sections can be replaced without difficulty.

In the device according to the invention, each pair of adjacent pump pipes between the inner and outer pipe of this pair of pipes seals exhibit. The seals and ch opposite surfaces of the inner and outer tubes can be a Limit the washing chamber into which the washing liquid can be introduced.

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This reduces the possibility of damage to the pipes through abrasion.

A plurality of pumping devices according to the invention can arrange themselves in parallel and with a staggered work cycle to ensure a more continuous flow in to achieve a common material conveyor.

Advantageous further developments of the invention emerge from the subclaims.

The invention is explained below with the aid of schematic drawings of several exemplary embodiments with further details explained. In the drawing shows:

1a and 1b side views in section of an embodiment of a pumping device according to the invention,

Pig. Fig. 2 is a plan view of one with that in Figs. 1a and 1b shown device according to the invention usable valve, and

Fig. 3 is a simplified side view in section of a Pump device in a further embodiment according to the invention.

Pig. 1a and 1b show a pumping device which has a telescopic Pump tube assembly 10 with two pump tubes 12 and 14, which have a telescopic relative movement are able to perform and a variable-volume pump chamber 16 with one that can be connected to a material container 20 Material inlet 18 and one located at a distance therefrom and connected to a material conveying device 24 Form connectable material outlet 22. If necessary, more than two pump tubes 12 and 14 can be provided.

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The device also has an inlet valve 26, with which the connection between the material inlet 18 and interrupt the materi al container 20 as needed leaves. With an outlet valve 28 can be as required the connection between the material outlet 22 and the material conveying device 24 close.

In the example shown, a drive 30 is a hydraulic cylinder 32 formed. With this drive, the pump tubes 12 and 14 can be telescoped relative to one another Adjust movement to pump chamber 16 with inlet valve 26 open and outlet valve closed to increase during each filling stroke, and with the outlet valve 28 open and the inlet valve 26 closed during to reduce each discharge stroke. Between the drive 30 and the respective shut-off device of the inlet and outlet valves A synchronizing device (not shown) is interposed between 26 and 28.

In the embodiment shown, the interior is Pump tube 12 almost, and the external pump tube 14 is adjustable in the longitudinal direction of the pump tube arrangement 10. The material outlet 22 is connected to the outlet valve 28 with a transfer pipe 23. The diameter of a the bore passing through the transfer pipe 23 decreases in the direction of the outlet valve 28.

Both the inlet and outlet valves 26 and 28 have a flexible pipe section 34 and 36, respectively, and one Shut-off device 38 or 40, with which the flexible Pipe section 34 and 36 for closing the associated Can compress valve 26 or 28 as required, on. The flexible pipe sections can be made with at least a braid layer, for example a steel braid layer reinforced rubber. Any of the shut-off devices 38 and 40 has a pair of pinch-off parts 42,44

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or 46,48, which in the example shown are designed as nip rollers, which are each on both sides of the flexible Pipe section 34 or 36 arranged and with relative movement are mutually adjustable in order to squeeze the flexible pipe section 34 or 36 between them. When in Fig. 1a The example shown in FIG. 1 and FIG. 1b, the pinch-off parts 42 and 44 or 46 and 48 are designed as nip rollers, although each Shut-off device 38 and 40 with a squeegee roller 42 or 46 can be provided, which the pipe section 34 and 36 press against a stationary plate. The inlet valve 26 is shown in its open position, so that an unimpeded Flow through the pipe section 34 is possible. The outlet valve 28 is drawn in its closed position, in which the connection between the material outlet 22 and the material conveyor device 24 is effectively interrupted.

Each of the shut-off devices 38 and 40 has a pivot bracket 50,52 and 54,56, in each of which an associated nip roller 42 and 44 or 46 and 48 is rotatably mounted. Furthermore, the shut-off devices 38 and 40 each have a drive 58 and 60 for themselves, which is shown in FIG Example are designed as hydraulic cylinders and with which the squeeze rollers 42 and 44 or 46 and 48 depending on If necessary, can be adjusted against each other in the closed position and away from each other in the open position. The drives 58 and 60 for the shut-off devices can also be actuated pneumatically or any other suitable one have mechanically or electrically operated device.

At the outlet valve 28 are the opposite nip rollers 46 and 48 can be adjusted relative to one another with a toggle lever arrangement, which can be adjusted by the reciprocating drive can be driven for the shut-off device. The toggle lever assembly for the exhaust valve 28 includes a pair of levers 62, 64, which are pivotally connected to one another at one end 66. Each of the opposing nip rollers 46 and 48 is on the associated lever 62 and 64 in one

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Pivot bearing 68 or 70 rotatably mounted. The drive 60 of the shut-off device engages the lever 62 at its end 72, facing away from the pivot connection point 66 between the levers 62 and 64.

The nip rollers 46 and 48 are arranged so that their axes are substantially parallel to each other and transverse to the run along the longitudinal axis of the flexible pipe section 36. the Squeegee rollers 46 and 48 can be constructed with a steel spindle and the self-lubricating liners are made of nylon or another material. The steel spindle can be provided with a protective cover made of rubber.

Each of the pivot brackets 54 and 56 is pivotally received on a bracket 74 at one end. The hydraulic cylinder 60 is also pivotably connected to the support 74. A single hydraulic cylinder 60 is also then usable when at each end of the nip rollers 46 and 48 toggle lever assemblies and pivot brackets 54,56, the interact with each other, are connected. This is possible because the piston rod 61 is on a cross rod 76 (Eig. 2) engages, which connects the ends 72 of the levers 62 to one another.

The structure of the intake valve 26 is the same as that of the exhaust valve similar. The inlet valve 26 has a hydraulic cylinder 58 which is pivotably connected to a support 78 and engages levers 80 and 82 on which the nip rollers 42 and 44 are rotatably mounted.

Both at the inlet valve 26 and outlet valve 28 are in the relative lengths of pivot mountings 50,52 and 54,56 and the lever 80,82 and 62,64 as well as the diameter of the nip rollers 42,44 and 46,48 and the flexible pipe sections 34 and 36 selected so that when the piston associated with the hydraulic cylinder 58 and 60 fully in the

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Cylinder is retracted, the nip rollers 42 and 44 or 46 and 48, as shown in Fig. 1a, no pressure on the exercise flexible pipe section 34 and 36, respectively. If, as shown in Fig. 1b, the piston rod or the piston 61 to extended into the outer end position from its hydraulic cylinder 60, causes the game of the toggle lever arrangement and the pivot brackets 54,56 that the opposite Adjust nip rollers 46 and 48 against each other and compress the flexible pipe section 36 between them, so that the flow of concrete or other material through the flexible pipe section 36 is stopped.

The inner and outer tubes 12 and 12, respectively, coupled to form a pair. 14 have seals 84 and 86 between them, which prevent the escape of material between the tubes. to these seals include an outer seal assembly 84 attached to the outer tube 14 at the end at which the inner tube 12 penetrates, as well as an inner sealing arrangement 86, which is attached to the inner tube 12 on the is arranged within the outer tube 14 lying end. Preferably, the inner and outer seal assemblies 86 and 84, respectively, impede the relative telescopic movement the tubes 12 and 14 not to a significant extent.

The inner seal assembly 86 has a seal retainer ring 85 in a recess on the inside of a End of the inner tube 12 is added. A seal retaining shoulder 87 on the ring 85 holds the seal 86 in contact on the inner tube 12. The ring 85 can be attached to the inner tube 12 with a (not shown) threaded pin must be attached. The bore through the ring 85 is preferably the same area with the bore penetrating the inner tube 12.

This design of the inner seal assembly 86 allows easy access to the seal for maintenance purposes when at removed transfer tube 23, the inner tube 12 through the Material outlet 22 is pulled out.

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The inner seal assembly 86, the outer seal assembly 84, the inner surface of the outer tube 14 and the outer surface of the inner tube 12 define a flushing chamber 88, in the rinsing liquid can be introduced via a feed device 90 is. The rinsing liquid is preferably water. The rinsing liquid located in the rinsing chamber 88 can be used to rinse the inner surface of the outer tube 14 to thereby reduce wear on this surface.

To the feed device 90 for introducing rinsing liquid A liquid jacket 91 also belongs in the rinsing chamber 88 an inlet 92 for the rinsing liquid inlet and an outlet 93 for the discharge of used rinsing liquid. Of the The liquid jacket 91 is in communication with the rinsing chamber 88 via openings 94.

The material inlet 18 of the pumping device or the pump tube assembly 10 can be connected directly or indirectly to the material container 20. This is shown in the Example embodied as a filling funnel 96 into which the material, for example concrete, can be filled from a transport mixer is. An agitator 98 is arranged in the filling funnel 96, with which the material located in the filling funnel is disposed lets stir before entering the pumping device. In the case of concrete, stirring will separate the Mixed ingredients in the material container before pumping reduced to a minimum.

The material outlet 22 of the pump tube arrangement 10 is coupled to the material conveying device 24, which is a conveying tube 100 has. At least part of the conveyor pipe 100 or, in another (not shown) embodiment, at least part of the connection between the material container 20 and the material inlet 18 of the pump tube assembly 10 is to compensate for the telescopic movement

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the pump tube assembly 10 made movable. For example For example, a part of the conveying pipe 100 can be formed by a flexible hose which is connected between the lines shown in FIG. 1b The positions shown in solid and dashed lines are adjustable. In a (not shown) modified In the embodiment, a portion of the conveyor pipe 100 can have a pair of telescopic pipes that are positively driven are or are in a reverse movement of the pump tubes 12 and 14 in the telescopic pump tube arrangement Adjust 10 so that the delivery pipe 100 increases accordingly when the pump pipe arrangement 10 is reduced in size, and vice versa.

The conveyor pipe 100 is attached to at least one wear ring 102 made of Hylon or another wear-resistant material supported and slides with this during the telescopic movement of the pump tube assembly 10 over a (not drawn) lubricated plate on the body of the truck or on another platform on which the pumping device is mounted.

In an embodiment shown in FIGS. 1a and 1b resulting modification, the outer tube 14 is fixed and is. connected to the material container 20. That Inner tube 12 is displaceable in outer tube 14 and stands with the material conveyor device 24 in connection. In this example, the outer tube 14 would be over with the inlet valve 26 a pipe similar to the transfer pipe 23 is connected, the bore diameter of which extends in the direction of the inlet side of the outer tube 14 would increase.

In the embodiment shown in Fig. 3, the inner pump tube 112 has a scoop tube 111 which is inside the Material container 120 is displaceable in order to advance in material in the material container 120 during each filling stroke and to be able to withdraw towards the container outlet during each ejection stroke.

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The scoop tube 111 is in a sealing arrangement 123 an outlet 121 of the material container 120 is displaceable. The inlet end 113 of the scoop tube 111 is funnel-shaped expanded outward in order to accommodate material from the material container 120 into the scoop tube 111 favor.

The scoop tube 111 is shown in a simplified manner Inlet valve 126 in connection, which is in the same shape like those in connection with the form of training according to Pig. 1a, 1b and 2 described valves 26 and 28 executed can be. The inlet valve 126 is on the inner pump tube 112 of the pump tube assembly 110 connected.

The inner tube 112 of the pump tube assembly 110 is in the outer tube 114 of the pump tube arrangement 110 guided displaceably and carries at its outlet end a seal 142, the leakage of material between the inner tube 112 and the outer tube 114 prevented.

With the scoop tube 111, the inlet valve 126 and the inner Pump tube 112 is a drive 130, for example in the form of a hydraulic cylinder 132 connected to the from the Above-mentioned components assembled unit is able to give a back and forth movement. During the expansion or pill stroke of the pump tube assembly 110, the inner pump tube 112 is pulled out of the outer pump tube 114 and the Scoop tube 111 is advanced into material container 120. During the reduction or discharge stroke of the pump tube assembly 110 becomes the inner pump tube 112 into the outer pump tube 114 is pushed in and the scoop tube 111 is partially pulled out of the material container 120.

The outer pump tube 114 is connected to an outlet valve 128, which in turn is connected to a conveying hose. The conveyor hose can in this form of training

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be substantially rigid as the outer pump tube 114 and the outlet valve 128 are attached to a frame or other support member for the pumping device ".

The operation of the pumping device in the in Fig. 1a and 1b illustrated embodiment according to the invention is described below on the basis of the normal state, in which the pump device is switched on when the pump chamber 16 is empty. Assuming that the telescopic pump tube assembly 10 at the beginning in FIG The first movement is a reduction stroke. Driving this reduction stroke the inlet valve 26 is closed, the outlet valve 28 is open. At the end of the reduction stroke, the intake valve 26 opened and the outlet valve 28 closed, so that material during the subsequent expansion stroke is sucked through the inlet valve 26 to partially fill the pump chamber 16. At the next reduction stroke air remaining in the pump chamber 16 is expelled and the pump chamber becomes by the following expansion stroke 16 filled with material. On the next downsizing stroke, material is passed through the outlet valve 28 into the Conveyor pipe 100 ejected.

As soon as the material container 20 connected to the pumping device has been emptied, the pumping device can be shut down and a plug of sponge-like material can be inserted through the inlet valve 26, which is able to separate the material in the pump device from a cleaning liquid, for example water. Of the Material container 20 can then be filled with the cleaning liquid and the pump switched on again to to force the cleaning fluid through the pump and the delivery line. As soon as the plug at the outlet of the delivery pipe 100 appears, the pump can be shut down or the material flowing out of the outlet can be removed from the area to which it was pumped to be diverted.

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For practical operation, the invention preferably provides that a plurality of pumping devices of the above-described Art is combined in parallel connection with a time-shifted work cycle to form a pump unit. the The respective material outlets 22 of the pumping devices are connected to a common material conveying device 24. In operation with such a pump unit there is a more continuous delivery of material than with a single one used pumping device on the material conveying device 24 can be achieved.

In the preferred embodiment of the pump assembly, the outlets 22 of the pump devices are each connected to a corresponding one Branch of a Y-pipe connected, the third branch of which is connected to a conveyor pipe 100. the Working cycles of the first and the second pump device take place with a mutual phase shift of im substantially 180 °, i.e. if the first device has a When the filling stroke begins, the second device begins its discharge stroke, and vice versa. At the outlet of the Y-pipe is therefore a substantially continuous flow of material is achieved.

The device according to the invention is mainly directed to use for pumping concrete. However, it glows one that other materials can also be pumped with the device described, in particular materials from pulpy consistency.

The use of a continuous pumping and conveying line ensures that the device is after Can be used to clean easily. The main parts of the pump set that are subject to wear are the relatively short flexible ear sections 34 and 36 in the valves 26 and 28, which, however, are easily accessible and can be replaced at relatively low cost.

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The invention is not restricted to the exemplary embodiments described above, but rather within this framework The basic idea can be modified in many ways.

/ Claims 409846/0373

Claims (12)

EXPECTATIONS Pump device for pumping concrete or other aterial, with a pump tube arrangement that has a variable volume Pump chamber with a material inlet that can be connected to a material container and one at a distance from it located, to a material conveying device connectable material outlet forms, with an inlet valve, with which can interrupt the connection between the material inlet and the material container as required, and with an outlet valve, with which the connection between the material outlet and the material conveyor device depending on Can interrupt demand, characterized in that the pump tube arrangement (10) at least two relatively Has mutually telescopic pump tubes (12,14), which in their telescoping relative movement of a Drive (30) are drivable to the pump chamber (16) with the inlet valve (26) open and the outlet valve closed (28) to be increased during each filling stroke and with the outlet valve (28) open and the inlet valve closed (26) to be reduced during each ejection stroke. 2. Pump device according to claim 1, characterized in that of the inlet and outlet valves (26 or 28) at least one of a flexible pipe section (34 or 36) and a shut-off device (38 or 40), with which is the flexible pipe section (34 or 36) to close the associated valve (26 or 28) depending on Can be compressed as needed, has. 409846/0373 / 2 - 2 - 44 899 3. Pump device according to claim 2, characterized in that g e k e η η, that each flexible pipe section (34, 36) made of rubber reinforced with at least one braid layer is made. 4. Pump device according to claim 2, characterized in that g e k e η η, that each shut-off device (38,40) has a pair of Abklemmteile (42,44 and 46,48) on both sides of the flexible pipe section (34 or 36) are arranged and adjustable with relative movement against each other to to squeeze the flexible pipe section (34 or 36) between you. 5. Pump device according to claim 4, characterized in that g e k e η η, that at least one pinch-off part (42 or 46) is designed as a squeeze roller, and that for the shut-off device (38,40) a swivel bracket (50,52 or 54,56) for the rotatable mounting of one squeeze roller (42 or or 46 or 48) and a drive (58 or 60) for the shut-off device (38 or 40) with which the Squeeze roller (42 or 46), depending on requirements, towards the associated pinch-off part (44 or 48) into the closed position and from this way can be adjusted in the open position. 6. Pump device according to claim '4, characterized in that each Abklemmteil (42,44,46,48) as Squeeze roller is formed, and that the opposing squeeze rollers of each pair of squeeze rollers (42,44 or 46, 48) with a reciprocating drive (58 or 60) for the shut-off device (38 or 40) drivable toggle lever arrangement are mutually adjustable, which are a pair at one end (66) pivotable with one another connected lever (62,64 or 80,82), each of the nip rollers (42,44 and 46,48) of a pair on one associated lever is rotatably mounted, and wherein the associated drive (58 or 60) for the shut-off device (38 or 40) one of the levers (62 or 80) on its the 409846/0373 44 899 Swivel joint between these levers facing away Able to drive the end. 7. Pump device according to claim 1, characterized in that g e k e η η, that at least a pair of adjacent pump tubes (12,14) between the inner and the outer tube (12 or 14) of this pair of tubes has a sealing arrangement (84, 86), to which an outer Sealing arrangement (84) which is arranged on the outer tube (14) at the end at which the inner tube (12) in the outer tube (14) penetrates, and an inner seal anorcbing (86), which are arranged on the inner tube (12) at the end lying inside the outer tube (14) is. 8. Pump device according to claim 7, characterized in that g e k e η η ζ eic h η e t that the outer and inner seals (86 and 84) and the inner surface of the outer tube (14) and the outer surface of the inner tube (12) delimit a rinsing chamber (88) into which rinsing liquid is fed with a feed device (90) can be initiated. 9. Pump device according to claim 1, characterized in that the material conveying device (24) is a Has conveyor pipe (100), which is used to compensate for telescoping Movement of the pump tube assembly (10) is made movable. 10. Pump device according to claim 1, characterized in that g e k e η η, that the connection between the material container (20) and the pump tube arrangement (10) to compensate is made movable by telescoping movement of the pump tube assembly (10). / 4 409846/0373 " - ξ - 44 899 11. Pump device according to claim 1, characterized in that one of the pump tubes (112) is a scoop tube (111), which is displaceable in the interior of the material container (120) in order to during each Iillhubes in material in the material container (120) advance and during retract each discharge stroke towards the container outlet can. 12. Pump device according to claim 1, characterized in that g e k e η η, that in the material container (20; 120) an agitator is arranged with which material in the material container (20; 120) can be stirred before it enters the pump device (10; 110). 13 · Pump device according to claim 1, characterized in that a plurality of pump devices (10; 110) connected in parallel and with a time-shifted working cycle to form a pump unit let, wherein the respective material outlets are connected to a common material conveying device to in operation a more continuous flow of material at the compared to the individual operation of a pumping device To achieve material conveyor. 409846/0373