DE1653415A1 - Concrete pumping device - Google Patents

Description

Patent registration
Thank you Inc. Hartland, Wiaoonein, USA

Betonpurapgerät

The invention relates to a concrete pumping device in which flowing concrete from trucks or a mixer in a reservoir is tipped, pressed by a pair of feed pumps through a transport line and into Areas inaccessible to trucks are encouraged ο More precisely, the invention represents an improvement of the pumping device which is described in U.S. Patent 3,181,469 and in which the pumps are move back and forth in unison but in opposite directions, with a suitable valve arrangement, which is in the the same rhythm as the reciprocation of the pumps is operated, alternating a connection between one Pump and the storage tank establishes, while at the same time a connection between the other pump and the transport line is made so that one pump sucks concrete from the storage tank, while the other pump sucks concrete in promoted transportation

The main object of the invention is to provide new and improved pumping apparatus of those mentioned above Art to create, which is robust and less prone to failure in operation, while on the other hand it is easier in the Construction and more effective in use than known constructions which have been used for related purposes.

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Another object of the invention is to provide an improved and to provide simplified valve having only a single movable member associated with a pair of Closure members are provided which control the flow of concrete from and into the pumps and which are themselves '' At the same time move easily through the concrete and have an extremely long service life.

The invention is also based on the more specific object of the valve member below the storage container to mount a given axis so that it can be swiveled back and forth, wherein one of the closure members moves on an arcuate path which is beneath the reservoir runs and concrete can alternately enter the pumps and daa other closure member in a perpendicular to this axis lying Ebent oscillates and the alternating Connection between the pumpert and the transport line manufactures.

According to the invention, a device is provided in particular for pumping flowing concrete, which has a housing with a first and a second flow channel, which are arranged in the housing next to one another at a lateral distance from one another and see first and second inlet openings arranged laterally from one another erstreckst downwardly * are i sit first and second, laterally spaced from one another. '. subordinate outlet ports in connection, which express the flow channels stands _f and wherein in the housing a valve member around a predetermined axis between two angularly offset next to one another in the lower 0? Positions can be pivoted to and fro »

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This device is characterized in that the valve member is provided with a first upwardly facing closure member which is movable along an arcuate path over the inlet openings and closes the latter alternately during such a swinging movement, and with a second closure member which is in one of the said axis is arranged in the vertical plane and is movable to and fro in this plane, with this oscillating movement closing off the pouring opening of each channel when the inlet opening of the channel is open "

An embodiment of the invention is shown below with reference to the associated dimensions ben j f

Fig »I is a partial plan view of a concrete

according to the present invention =

Fig. 2 is also a partial side view Fig.1 shown pumping device.

Fig. 3 is an enlarged "shown broken away

Sectional view along line 3-3 of FIG.

4 is an enlarged longitudinal division of the tendon Line 4-4 from Pig. 3.

Fig. 5 is a perspective view of a the pump piston.

Figure 6 is a partially exploded view

perspective view of the valve and a file of the valve housing.

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Pig.7 is an enlarged partial sectional view along line 7-7 of Fig. 1

Figure 8 is a partially exploded view Representation of the valve housing and the connection to the transport line.

Pig.S is a scary view with one Flow diagram of the pumping device a.

Wii is shown in the drawings, the invention is a concrete hay pump apparatus of the type realized we at. ' The flowing concrete is tipped from a truck or a bit into a storage container 10 and is pumped to distant points and places to be reached by a transport line not shown. Eir. Such a device is particularly suitable for pumping Be on into the upper floors of multi-storey buildings, di? are under construction, for the pouring of complex architectural constructions and for related operations, where concrete is brought into areas inaccessible to trucks

Tiat. The pump device is arranged on a trailer 11 with a rectangular horizontal frame 12. In another way, the track 12 is mounted on wheel assemblies with rags 12, the latter being rotatably mounted on axle shafts 14 which are attached to opposite ends of longitudinally extending rails 15 on each side of the rack.

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The reservoir 10 is near the front end of the frame is mounted on a housing 17 (FIGS. 1 and 7) and is provided with an open lower end 18 which in size and shape about the upper end of the housing is equivalent to. The concrete flows out of the opening in the reservoir and through inlet openings 19 (see Pig. 6 and 7) into the housing and then to the concrete pumping device, through which it is pushed into the transport line, which can be connected to a trouser piece 20 (Fig.1), which in turn is connected to the front end of the housing through outlet openings 21 (Figo5 and 8) is in connection.

As shown in Figures 3 and 4, the concrete pumping apparatus includes a pair of juxtaposed reciprocating pumps 22 and 23 'having cylinders 24 extending longitudinally of the frame 12 and at their front ends with the rear end of the housing 17 are connected via suction openings 25 (FIGS. 3 and 6) and receive concrete flowing from the storage container 10 to the housing. In each cylinder, a pump piston is reciprocable 26 and arranged reciprocally movable, the dense, but slidably fitted in the cylinder bore and the front, closed end 27 (Figure 3 _o) a hollow tubular piston rod is supported 28th The piston rods also serve as cylinders for hydraulically operated actuating pumps 29 and 30, which move the pistons 26 of the concrete pump back and forth during the pumping process. Hydraulic pressure medium for operating the actuating pumps 29 and 30 is supplied by a pressure medium pump 31 (shown schematically in FIG. 9), which is arranged in an oil storage container 32 (FIGS. 2 and 6) which is arranged on the rear part of the frame and in is known to be driven by a petrol engine 33 *

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By a valve arrangement arranged in the housing 17 35 (Figo 6}, each cylinder 24 of the concrete pump is alternating with the gate rate container 10 and the transport line connected, first to a batch of concrete from the storage tank through one of the inlet openings 19 and to receive one of the suction openings 25 when the associated piston 26 goes back and then to move the batch through the suction opening and through one of the outlet openings 21 to pump back and into the transport line when the Piston moves forward. The pistons are reciprocated in unison, but in opposite directions, so that a piston moves concrete in its forward stroke the transport line pumps, while the other piston pumps concrete from the storage tank into his during its Bückhub Cylinder sucking in «The valve arrangement has closure members 36 and 37 to close off the outlet openings of the individual pumps during filling in order to ensure a complete To ensure filling and to shut off the inlet openings of the individual pumps, if the latter pump to ensure that the entire batch is conveyed into the transport line »

In accordance with an essential aspect of the present invention, the flow of concrete into and out of pumps 22 and 2? controlled by a new and improved valve 35, in which the closure members 36 and 31 are formed as a single, one-piece unit and at the same time are arranged in the housing 17 in a novel manner so that the valve has a longer service life and is self-contained more easily moved through the concrete than known valves used for similar purposes «

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For this purpose, the connecting members are integrally formed with one another and mounted in the housing in such a way that they can be pivoted to and fro in two positions about an essentially horizontal axis, synchronized with the movement of the pump . During the oscillation ata valve, the first closure member 36 swings along an arcuate path which runs above the axis and below the storage container IO, and alternately closes the inlet openings 19t and the second verse hlußglieä 37 swings in a plane perpendicular to the axis and alternately closes the Outlet openings 21 »The arrangement of the closure members in the housing is such that metallic contact between closure members and 3 housings is minimized, whereby the wear of the valve is reduced, and the closure members are shaped so that they pass through the concrete move with an inevitable cutting action »

In the present example, the housing 17 for the valve 35 is a cast part with opposing parallel side walls 38 (FIGS. 6 and 7) which are connected to one another at their edges by a vertical and transverse suction wall 39. The upper edges of the housing walls are _n bent oh outside and form a *? upwardly directed flange 40 which is screwed to a complementary flange 41 which is bent outward at the lower end of the storage container 10, whereby the storage container is fastened to the housing. A substantially vertical partition 42 projects from the central part of the rear wall, which divides the housing into a pair of vertical flow channels 43 and 44, which are laterally spaced from one another,

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with the opening 18 in the storage container via the upwardly opening inlet openings 19 is connected ο These inlet openings 19 are delimited by the partition wall and the side walls 38. At their lower end is the partition is provided with a lower part 45 which has a rounded lower surface which gradually extends into the Sidewall merges and thus forms a curved base for the housing. Pie suction openings for the pumps " cylinders are formed in the rear wall 39 near the lower ends of the flow channels and open into tubes (Fig. 3 and 6), which are arranged at a lateral distance from each other and consist of one piece with the rear wall, and which are connected to the outlet or forward ends of the pump cylinders 24, as best seen in Figure 3 is shown »

The front wall of the housing 17 is formed by a flat, vertical cover plate 47 (FIG. 8) which is removably screwed to a substantially U-shaped spacer plate 48 (FIGS. 6 and 8) which is attached to the front edges of the side walls 38 and the bottom of the housing attached iet. The cover plate closes the front sides of the flow channels 43 and 44 completely off to on at a lateral distance from one another in the cover plate provided openings which lead ^z 8em pants piece 20th These openings represent the Aualaßöff mangen 21 (Fig. 3 and 8} for the pumps 22 and 22 and are aligned with the suction openings 25 so that they form a substantially straight flow path between the pumps and the pants.

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.at; the latter consists of a pair of separate and laterally spaced tubes 49 which are aligned with the outlet openings and combine to form a tiny forwardly projecting spout 50 which can be connected to the transport. So does the concrete flow from the storage container 10 to the flow channels 4? and 44 of the housing through the inlet openings 19 and from the ducts into the pump cylinder (iarch the suction openings 25 'When the concrete is pumped out of the Vif soils, it flows back through the suction openings, over the bottoms of the ducts and through the outlet openings 21 into the pipes 49 and finally into the '.i'ille 50 and the transport line for bringing it to a desired location.

If the valve 35 and the housing 17 of FIG That is, to enable 3m of concrete after each pumping operation F) ssnstück 20 mounted pivotably from the housing, see above caß the outlet openings 21 are exposed and water, «Elches up for flushing the casing in this and that Valve is introduced through the outlet ports can. For this purpose are on one of the side wall 38 of the housing at a vertical distance from each other e-.n pair of outwardly protruding eyes 51 (Pig. 8) intended. This access via an approach 52, which is on rear end of the pant is attached. Bas Hüsenstüok is through a vertical pin 53 »which holes in the eyes and the base passes through it, articulated to the side wall. On the opposite Side is the rose piece on the side wall by a removable bolt 54 or other suitable fastening means attached to the duroh holes in the eyes 55

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and a lug 55β on the side wall or the pants bottom is tucked through. Thus, the Hoaenstück be pivoted by removing the bolt around the pin 53 of the housing, so that the drainage of Water and concrete take place directly through the outlet openings 21 can »if the valve and the housing are flushed through for cleaning purposes. In addition, the valve 35 by swiveling the Y-piece from the housing and by unscrewing the cover plate easily for the purpose of Repair or replacement exposed.

As shown in Figures 6-8, the valve is keyed to the forward end of a horizontal shaft 56, which through the rear wall 39 and the partition 42 of the housing 17 through the front durchragir and pivot in a socket 57 = is stored bar, which is arranged in the partition just above the level of the inlet openings. At the rear end of the shaft is a crank 58 (Figs. 1, 7 and 9) attached, which is connected to a power-operated mechanism 59 through which the valve between Can be swiveled back and forth between the two valve positions In the present example, this mechanism is attached to the outside of the rear wall 31 of the housing 17 and contains it a pair of pistons 60 and 61 (Fig.S) * which are in a pair guided by cylinders 62 and 63 and shared by one Piston rod 64 are connected to one another. The latter stands by a pin 65 which extends transversely through the piston rod and is hinged to the free end of the crank is in drive connection with the crank 58

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Pressure oil is first admitted into the cylinder 62 and because in the cylinder 63 to move the piston rod 64 laterally in opposite directions and over Place the crank back and forth to turn the valve between the two.

The valve is provided with a circular hub 66 (Pig.6) which protrudes into a recess 67 in the partition wall, an aector-shaped plate 68 seated thereon protruding radially and essentially upwards from the hub. Because of the spacer plate 48, the cover plate sits at a distance in front of the front surface of the partition 42 and forms a vertically extending gap 69 (FIG. 3) _f through which the sector plate 68 swings when the valve swings with the Y / elle 56.

The first valve closure member 36 controls the flow of Bston from the storage container into the flow channels 43 and 44 by opening the inlet openings 19 alternately and closes, and consists of a curved metal plate which is provided at the upper end of the sector plate 68 and from this protrudes backwards. The curved plate is inserted in one position of the valve (Fig. 8) 36 from the inlet opening 19 for the flow channel 43 and thus blocks the flow of concrete from the storage container to the pump 22, while this plate in the other position of the valve (Fig.7) the inlet opening of the channel 44 covers and shuts off the flow of concrete to the pump 23. The curved plate protrudes in every valve position between one of the housing side walls 38 and the partition wall 42, the lower sides of which are alternately beveled The ends of the plate sit on an insert 69a,

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which is inserted in the upper part of the partition wall, which prevents the passage of concrete into the channel over the partition wall. " The top and bottom surfaces
of the plate are concentric about the axis of shaft 56
curved, and as a result the curved upper surface cuts smoothly through the concrete, and the lower surface passes the top of the partition wall at a narrow distance * when the valve moves back and forth “To keep the metallic contact between valve and housing as low as possible , the trailing edge of the curved plate moves in an arcuate groove 70 formed in the back wall 39 and is approximately 1 mm from the top and bottom surfaces of the groove. This arrangement prevents concrete from flowing down between the rear edge of the curved plate 36 and the rear wall 39, and connector ¹ ; but wear and tear caused by direct rubbing
of the plate against the rear wall _o In addition, the upper surface of the plate at each of the ventings extends tangentially to the side walls 38, and
thus the valve has no edges that are brought to rest on the side walls and a roughening or
The breakage of stones between the valve and the housing will result, as a result, the service life of the
Valve increases while the power required to reciprocate the valve is decreased.

In the present example, the second valve closure member is used to control the outlet openings 21
paddle-like plate that sits firmly on the liabe 66 and Ir? the same plane as the sector plate 68.

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When the valve swings, the paddle plate swings in a vertical slot 69 between the bulkhead 42 and the cover plate 47 »with the rear surface of the paddle plate passing close to the front surface of the partition wall · The lower or outer end 71 of the paddle plate is curved concentrically about the axis of the shaft 56 and is preferably approximately 1 mm from the complementarily shaped upper surface 72 of a recess formed in the lower part of the spacer plate 48 is cut out on the housing 17 so that it is not in frictional contact with the spacer plate is. Because the paddle plate lies in a single plane and is relatively thin, it cuts smoothly through the concrete when the valve swings and does not prevent movement of the valve to any appreciable extent. The paddle board is sufficient wide to cover one of the outlet openings 21 (Pig, 3 and 8) in each of the two positions of the valve and is angularly offset from the curved plate 36 such that when the valve is in the position shown in FIG is, the paddle plate closes the outlet opening of the pump 22, while the curved plate 36 closes the inlet opening for the pump 23. In the other valve position (Fig.8) the plates are at an angle of pivoted about 90 ° and so the paddle plate covers the outlet opening for the pump 23, and the curved one Plate covers the inlet opening for the pump 22. Since the valve oscillates in synchronism with the reciprocating movement of the pumps, each pump receives a batch of concrete through its open inlet port and its suction port, while its outlet port is closed by the paddle plate 37, and then pumps the batch

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-At-

through its outlet opening and into the transport line, while its inlet port is closed by the curved plate.

- To move the pistons 26 of the concrete pumps back and forth, direct the actuation pumps 29 and 30 (Figl9) pressure oil from the pressure pump 31 to the tubular piston rods and cooperate with the latter to create the concrete pistons to push forward under the influence of the oil pressure. In addition, the two actuator pumps are connected to one another by a closed hydraulic circuit in such a way that that a forward movement of a concrete piston a corresponding but opposite movement of the other JCoI De ns triggers. To this end, each actuation pump has a stationary cylindrical piston 73 on, which is tightly but slidably fitted into the bore of the piston rod and one end of a pressure-tight Chamber 74 forms, while the rest of the chamber through the closed end 27 and the inner wall of the piston "Tange is limited" from each actuating piston 73 protrudes an elongated tube 75 to the rear which, at its rear end, is rigidly attached to a fixed frame member is attached and forms a longitudinal duct 76 which is connected to the oil pump 31 and extends through the actuating piston 73 into the chamber 74. If Urucköl is pressed through the channel into the chamber, the pressure is supported on the actuating piston 73 and causes the piston rod 28 to slide forward on the actuating piston and push the concrete piston 26 forwards or to the right in Figo3 »

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The closed hydraulic circuit for retracting the concrete pump piston 26 is formed by an outer tube or a Hulse 77 coaxially ⁿ to the inner tube 6 each actuation pump 29 and 30 and separated from the inner Tiohr at such a distance that a longitudinal channel 78 between the Sleeve 77 and the tube 76 is formed. At its rear end, the sleeve 77 is attached to a cap 79 on the frame 12, while the front end of the sleeve telescopes into the bore in the piston rod 28 and is connected to the actuating piston 73.

The inner walls of the piston rod and the outer walls of the sleeve form a chamber 80 which is closed at its front end by the actuating piston 73 and at its rear end by a flanged sleeve 81 which is screwed into the rear end of the piston rod iat and slid on the sleeve 77. The chamber 80 communicates with the channel 78 through openings 82 which are provided in the front end of the sleeve near the actuating piston 73, and the channels 78 each * ¹ actuating pump communicate with one another via a C) outer tube 83 in connection which connects openings 84 (Pigo4) provided in each cap and in the rear end of each sleeve with one another. In this Anardrustg image η the chambers 80 and channels 78 of the two loading "tätigungtroumpen together with the transverse tube 83 a geeohioa .i 'nen hydraulic circuit between the pump and Fieser Kr Ji? 3: Ust constant with a constant oil volume is filled. If, therefore, one of the piston rods 28 moves under the I-influt VJi pressure medium which is introduced through the channel 76 - ":" 2: itet n'i;<i _t '/ orwürt nf? If "ltf" -t, no pjoh dje with

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a flange provided socket 81 on the operating lever 73 and thereby reduces the size of the associated chamber 80 and pushes the oil out of it the openings 82 and into the channel 78. From this channel 01 flows into the transverse tube 83 and then into the channel 78 and the chamber 80 of the other actuation purape “If As the pressure medium enters the opposite chamber 80, it exerts pressure between the back of the Actuating piston 73 and the flange provided Bushing 81, whereby it pushes the piston rod 28 back on the actuating piston 73 and the concrete piston 26 withdraws. In the closed circuit, there is no oil flow except that between the two actuators ^ ungspurapen, and the direction of this current is reversed periodically so that the concrete pistons 26 are alternately withdrawn »

In order to move the concrete pistons 26 back and forth in unison, but in opposite directions, and to swivel the valve back and forth with the back and forth movement of the pump pistons, oil from the pressure pump is alternately fed into the channels of the actuating valves 29 and through a single four-way valve 85 30 and also introduced into the cylinders 62 and 63 of the pivot mechanism 59. The four-way valve 85 is automatically controlled by the movement of the concrete pumps.

As shown in Pig _o 9, the pressure pump 31 draws oil from a? Reservoir 32 by a line 86, and; "uropt ÖIE UIO via a supply line 80 into the housing dee Ventivs 85th

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Depending on the position of a slide 89 which is slidably arranged in the valve housing 87, oil flows from the housing 87 into one of a pair of lines 90 and 91 1 which connects the valve housing with the channels 76 of the actuating pumps 29 and 30 the slide, as shown in Fig. 9 is arranged, pressure medium is introduced from the pressure pump 31 into the line 90 and then into the channel 76 and the chamber 74 of the actuating pump 29 and pushes the piston 26 of the W concrete pump 22 forward ο the piston of the The other concrete pump 23 is simultaneously moved back because of the closed hydraulic circuit between the pumps, and as a result, oil in the chamber 74 of the actuation pump 30 flows through the channel 76 and line 91 into the valve housing and then via a return line 92 which runs between the valve housing and the Storage container switched off in the storage container. In addition, oil flows from the line 90 via a branch line 93, which is connected to the cylinder 62 for pivoting the valve, and pushes the piston rod 64 to the left (Fig. 7K whereby the concrete valve 35 is switched according to the state of the M concrete pumps Oil from cylinder 61 drains through branch line 94 connected to line 91. Since less power is required to move the valve back and forth than is needed to move the pumps back and forth, this switches Valve to its correct position just before the piston 26 begins its forward stroke.

When the piston 26 of the concrete pump 22 reaches the end of its forward stroke, the flange engages the bushing 81 at the end of a lever 95 (Figo9) and pivoted the Lever around the peg on the frame in an anti-clockwise direction.

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The lever is connected to the valve slide 89 by a link 97 which switches the slide over when the lever is pivoted and thereby a pressure medium ■ connection between the supply line 88 and the line 91 which leads to the channel 76 of the actuating pump 30 The piston 26 of the concrete pump 30 then becomes accordingly pushed forward, and the piston of the concrete pump 22 is moved back, the pressure medium from the chamber 74 through the line 90 into the valve housing 87 and from there via a valve housing 87 to the return line 92 connecting Return line 98 to the reservoir 32 from. At the same time, oil is added to the branch 94 and the Cylinder 63 is supplied, as a result of which the piston rod 64 is moved to the right (FIG. 7) and the position of the concrete valve 35 is switched just before the piston 26 the pump 23 begins its forward stroke. The valve slide 89 is returned to the position shown in Pig.9 when the piston of the concrete pump 23 reaches the end of its Forward stroke reached and the splash at the associated Bushing 81 engages at the opposite end of the lever 95 and rotates it clockwise. Accordingly is the valve slide each time by one of its zv / e: ', Positions switched to the other when one of the concrete pistons reaches the end of its forward stroke and thus causes oil to be conveyed first to one actuating pump and then to the other, and that at the same time oil alternately flows to the cylinders of the swing mechanism 59. Because the reversal of the pumping action and the valve position Controlled by the movement of the pumps themselves, the flow of concrete to the pipeline plumbs essentially continuous during the entire pump operation

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The present invention also provides novel means which enable the concrete pistons 26 to be quickly and easily removed from the piston rods 28 when it is necessary to clean or replace the pistons. In the present example these means consist of a connecting father part 100 (Pig.3) on each piston rod and a connecting nut part 101 (Fig.5) on each piston, these two connecting parts interlocking so that they prevent axial movement of the piston relative to the piston rod while allowing radial movement of the piston against the piston rod to uncouple the piston from the rod. As shown in Figure 3, the connecting father part is a short cylindrical extension 102 which protrudes from the closed end 27 of the piston rod and is provided with an annular button or head 103 at its front end. The front end of the rod and the back of the head 103 form a pair of shoulders at an axial distance from each other, which together with the shoulder 102 delimit an annular groove 104 between the head and the end of the rod "Daa connecting nut part 101 (Fig.6) contains" ine flat disc 104a at the rear end of the Kolbene and a semicircular lip 105, which axially projects from the disc and is provided at its free end with a retracted radial flange 106 "Fin pair of lugs 107, which tl.ichen of the EER ends or Legs of the collar protrude, cooperate with the latter in the form that they form a downwardly open, TJ-shaped recess 108, which has a lateral width of slightly larger diameter than that of the attachment 102 of the connecting father part »

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As shown most clearly in Figures 3 and 9, the collar 106 on the piston 26 fits into the groove 104 formed by the connector male portion, the idppe engaging over the top surface of the head 103 and the lugs 107 on the boss 102 ride. Opposing surfaces of the collar and lugs 107 abut the shoulders formed by the head and end of the piston rod and prevent axial movement of the piston, while the U-shaped recess 108 allows the rod and piston to be uncoupled by simply lifting the latter in the radial direction.

The pistons 26 here consist of a flexible material like rubber so that they maintain a tight fit in the cylinders 24. Specifically, each flask contains a pair of rubber sleeves 135 (Fig. 9) i over the shaft 136 of a Bolt 136 is pushed, which is screwed into the washer 104a »The sleeves are between the washer and an enlarged head 137 on the shaft and have front and rear, outwardly facing doctor edges 13 & provided. As a result of this arrangement, any concrete that may be on the forward stroke will be at the front The scraper edge could work past, promoted during the return stroke through the rear scraper edge to the rear of the cylinder. The sleeve can be removed for replacement by just unscrewing the bolt from the washer and the sleeves are stripped from the shaft.

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Dei Bahraen 12 and the cylinders 24 are arranged so that sit 'allow easy access to pistons 26 and such allow the pistons and piston rods to be uncoupled » without having to remove any other pump parts. For this purpose there is a 12 on the main frame Kaaten-shaped intermediate frame 109 (Pig.3) mounted, which has an open top and longitudinal dimensions that are greater than the length of the pistons. The cylinders 24 are connected to the front wall of the wiper frame and open towards the interior thereof, while the piston rods 28 are slidably mounted in bearings 110 which are attached to are attached to the rear wall of the intermediate frame and protrude into the cylinder. When pumps 22 and 23 are working, the normal stroke of the piston rods is such that the pistons are always guided in the cylinders, as in Pig. 3 is shown in solid lines, and thus remain di? Pistons connected to the rods.

However, if a piston replacement is required, the> 3 piston rods can be pushed backwards by hand. so that you can pull the piston out of the cylinder and into an opening formed υολ the intermediate frame, as shown in Figure 3 in dashed lines. The pistons are then completely exposed and can be lifted off the rods and replaced by pistons that are provided with new rubber sleeves 135 »

When the pumps 22 and 23 are in operation, it is desirable to have the frame 12 as stable as possible in order to a movement of the frame under the influence of the reaction forces to avoid that are generated by the reciprocation of the pump piston 26 »

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It used to be common practice to block each side of the wheels 13 or to hydraulically raise and jack up the frame, to keep the tracks stable, although these operations required a considerable amount of time to set up and dismantle « According to another aspect of the present invention this provides that the frame and the had relative to each other are mounted movably in the vertical direction under the influence of hydraulic lifting members 115, whereby the Frame can be lowered so that it is firmly seated on the ground or other supporting surface, if the pumps work simply by operating the hydraulic lifters. To this end, everyone is Rail 15, on which the baths sit, pivotable at 116 connected to the lower end of a vertical pillar 117 (Figd and 2), which in one on the side of the Boehmens attached vertical U-piece 118 is slidably guided. About the movement of the rails around the pivot point 116 are semi-elliptical springs 119 between the top of the rails and flanges 120 provided which protrude outwards from the pillars 117 «. The piston rods 121 of the hydraulic lifting members are attached to the upper ends of the pillars 117 and slide in cylinders 122 which are rigidly attached to the frame ",

In Fig. 2 the trailer is shown in the transport position, wherein the frame 12 is at a distance above the ground and the columns are in the lower ends of the U-pieces 118 are located., In this position, the lifting members of oil is applied, which via a line 125 (Figo9) in the cylinder 122 is initiated. The line 125 is connected to the pressure pump 31 and is operated by a Valve 126 mastered ",

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lowering the frame in the operating position, it is only necessary to open the valve 126 and a valve 127 in a kick line 128 and thereby drain the oil from the cylinders, whereupon the frame slides down on the pillars and relative to the oars. As a result, the frame can be lowered in seconds, ^S he 8aß directly on the ground or resting on including defined edges, and therefore during the operation of pumps in a very stable condition

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SAD

Claims (1)

Claims I) J device, in particular for pumping flowing concrete, with a housing in which erate and wide flow channels are provided at a distance next to each other, which run down from the first and second laterally spaced inlet openings and with the first and second laterally spaced mutually arranged outlet openings are in communication, the latter opening side by side in the lower part of the flow channels, and with a valve body which can be pivoted back and forth in the housing about a predetermined axis between two angularly offset positions, characterized, that the valve body (35) is provided with a first, upwardly facing closure member (36) which is movable along an arcuate path over the inlet openings (19) and this in such Looping movement alternately opens and closes and with a second closure member (37), which is in a is arranged perpendicular to the axis (56) plane and is bin- and pivotable during the oscillating movement in this plane, so that it closes off the outlet opening (21) of each flow channel when the inlet opening of this Channel is open -25- 109836/0258 _BATH 2) Apparatus according to claim 1, characterized in that the valve has a hub (66) and a vertical plate (68) which protrudes from the hub (66) upwards, that the first closure member consists of a curved plate (36) whose upper and lower surfaces are curved concentrically around the axis (56), and that the second closure member consists of a plate (37) which protrudes radially downwards from the boss (66) and lies in a plane perpendicular to the axis. 3) Qarät according to one of the preceding claims, characterized in that that above the housing (17) a storage container (ic) is arranged to receive a quantity to be pumped flowing concrete, which is connected to an open lower End (18) connected to the inlet openings (19) of the housing (17) so that a stream of concrete under the influence of gravity enters the flow channels, that first and second reciprocating pumps (22, 23) are provided which concrete from the storage tank (10) withdraw via the flow channels and pump the concrete out through the outlet openings (21), that each pump (22,23) has a cylinder (24) which opens into the respective flow channel, that the first closure member (36) closes the first inlet opening (19) in a first valve position and is in a second valve position above the second inlet opening and shuts it off, whereby the Inlet openings (19) open and closed alternately and control the flow of concrete, -26- 109836/0258 BATH -M- that the second locking member (37) in the first valve division above the second outlet opening (21) lies and theeae closes and lies in the second valve division above the first outlet opening and this closes, and that means for moving the pumps (22, 23) in and forth and for pivoting the valve body to and fro (35) are provided synchronously therewith, so that the valve body (35) is held in the first position while the first pump (22) pumps and the second pump (23) concrete from the storage tank (10) subtracts, and that the valve body (35) is held in the second position when the states of the pumps (22,23) are reversed. " 4) Device according to claim 3, characterized in that that the housing (17) opposite longitudinal side walls (38) and transverse end walls (39t 47), which connect these side walls to one another, and that the flow channels are formed by the side walls and a vertical partition wall (42) which is arranged between these side walls (38) and extends in the longitudinal direction from an end wall (39, 47) to the other extends » 5) Device according to claim 4 »characterized in that that the valve body (35) swings about an axis (56) which runs through this partition (42), -27- 109836/0258 -X- and that the first Verachlußglied (36) one upwards swept plate that swings on a path running between the sidecar (38), wherein the lower surface of the plate moves over the upper end of the partition wall (42) as it vibrates » 6} Device according to claim 5 »characterized in that that the plate (36) in the alternating valve positions tangential to alternating side winds (38) runs. 7) Device according to claim 5 or 6, characterized in that an end wall (39) has an arcuate hat (70) and the first closure member plate (36) has a correspondingly curved band, which in this groove (70) is movable. 8} Device according to one of claims 4 to 7, characterized in that » that iifc partition (42) close in front of the other end wall (47) ends and a perpendicular slot (69) between the end wall (47) and the opposite surface of the partition (42) forms, and that the second closure member is a plate (37) which is arranged in a vertical plane and can be pivoted through this gap during the oscillating movement of the valve body (35). -28- 109836/0258 BATH ORIGINAL 1 bb i ι * I ö 9) Device according to claim 8, characterized in that that the housing (17) with an arcuate curved Floor inner surface (72) is provided, and that the second closure member plate (37) with a correspondingly curved lower end (71) is provided, which during the oscillating movement of the valve body (35) moved close to this surface (72). 10) Device according to one of claims 3 to 9, characterized in that that the cylinder (24) with the flow channels over laterally adjacent suction openings (25) are connected, which are provided in an end wall (39), and that the outlet openings (21) are formed in the other end wall (47) and with the suction openings (25) are aligned so that a substantially straight flow path from the cylinders (24) to the outlet openings (21) is created. 11) Device according to one of claims 3 to 10, characterized in that that a trouser piece (20) with the outlet openings (21) is in connection, which is pivotably hinged to the housing. 12) Device according to one of claims 3 to 11, characterized in that that in each of the cylinders (24) a piston (26) and a piston rod (28) are arranged to be movable to and fro, 109836/0258 that at one end of the piston rod a connection father part (100) is attached »which has an annular shoulder (103) which sits at an axial distance from the end of the piston rod (28) and an annular groove (104) delimits between the shoulder (103) and the end of the piston rod (28), and that at the end facing the piston rod (28) of the piston (26) a connecting nut part (101) with a U-shaped collar (106) is provided which extends over the connecting father part (100) and in the hat (104) engages and on the shoulder (103) engages so that a Decoupling movement of the piston. (26) axially to the rod (20) is prevented, while there is a decoupling movement of the piston (26) radially to the piston rod (28) allows. Device according to one of Claims 3 to 12, characterized by chassis units on each side of the frame (11) on which the latter is supported, which chassis units are so guided, that it is between a transport position in which the frame (11) is arranged above the level of the supporting surface and the weight of the frame (11) is carried by the chassis units, and an operating position in which the frame rests on the supporting surface and the driving seat units bear essentially none of their weight, move up and down, and that between the chassis units and the Track »a lifting mechanism (115) is provided, by means of which the frame (11) from the operating position into the The port position can be raised 109836/0258 -30 14) device according to claim 13, characterized in that each of the chassis units has a length having extending rail (15), at the opposite ends of which wheels (13) are rotatably arranged are, that the rail (15) is pivotally supported on a vertical member (117) in the vicinity of its center is, and that the vertical member (117) is guided up and down on the frame (H) relative to the frame (11) 109836/0258