DE1974431U - CONCRETE PUMP EQUIPMENT. - Google Patents

Description

PJU15 M 1 * July 25, 67

Utility model registration

Thank Inc «Hartland, Wisconsin, USA

Concrete pumping device

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 is promoted that are inaccessible to trucks ο More precisely, the invention represents an improvement of the pumping device, which is incorporated in the USA patent 3 181 469 is described and in which the pumps reciprocate in unison but in opposite directions move around, using a suitable valve arrangement, in the same rhythm as the reciprocation of the pumps is actuated, alternately establishes a connection between a pump and the reservoir, 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 the transport line promotes =

The main object of the invention is to provide a new and improved pumping device of the foregoing Art to create, which is robust and less prone to failure in operation, while on the other hand it is easier in the Structure and is more effective in use than known structures that have been used for related purposes <.

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Another object of the invention is to provide an improved and simplified valve which has only a single movable member which is connected to 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 the other closure member in a perpendicular to This axis lying plane oscillates and the alternating connection between the pumps and the transport line manufactures »

According to the invention, a device is provided in particular for pumping flowing concrete, which has a housing having a first and a second flow channel, which in the housing side by side at a lateral distance are arranged from each other and from first and second, laterally spaced apart inlet openings from extending downward and having first and second, laterally spaced from each other Outlet openings are in communication, which open side by side in the lower part of the flow channels, and at which in the housing a valve member to and fro about a predetermined axis between two angularly offset positions is pivotable »

This device is characterized in that the valve member with a first facing upward Closing member is provided along an arcuate Path over the inlet openings is movable and the latter alternately in such a swinging movement closes, and with a second closure member which is arranged in a plane perpendicular to said axis and is movable to and fro in this plane, with this oscillating movement being the outlet opening;} of each channel shuts off when the inlet opening of the channel is open »

An embodiment of the invention is described below with reference to the accompanying drawings:

Figot is a partial top plan view of concrete pumping equipment according to the present invention »

FIG _o 2 is a partial side view of the pump apparatus shown in l.

Figc3 is an enlarged, broken away

Sectional view along line 3-3 of FIG.

FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG.

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

Fig. 6 is a partially exploded view

perspective view of the valve and part of the valve housing.

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Figure 7 is an enlarged partial sectional view

along line 7-7 of Figure 1

FIg _n S is a partially expanded one

Representation of the valve housing and the connection to the transport line.

Fig. 9 is a schematic view with a Flow diagram of the pumping device.

π η is shown in the 2 drawings, the invention is implemented in a concrete pumping device of the type in which the flowing concrete is tipped from trucks or a mixer i, n a storage container 10 and through a transport line shown ui lit to distant points raif £ m hard-to-reach places is pumped »I!;. ~; --olcbea device is particularly suitable for pumping from 'JutGi: in the upper floors of multi-storey buildings, (■ :) - in eau are, for casting complicated architectoiiidisr constructions and for related operations, with <! ·· en Beior in for Trucks brought inaccessible areas

■> 8ΐ pumping device is arranged on a trailer 11 with a ΤΘ-: ": htackigen horizontal frame 12" The frame 2 is mounted in tandem on wheel arrangements with wheels 13, the latter being rotatably mounted on stub axles H * which are at opposite ends of longitudinally extending rails 15 on each side of the frame an = £ e'urc; oht are β

The reservoir 10 is near the front end of the frame on a housing 17 (Pig.1 and 7) and is provided with an open lower end 18, the corresponds approximately in size and shape to the upper end of the housing. 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 pressed into the transport line, which can be connected to a Y-piece 20 (Pig.1), that in turn with the front end of the housing through outlet openings 21 (Mgο5 and 8).

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 (Pig »3 and 6) and receive concrete flowing from the storage container 10 to the housing. In each cylinder there is a reciprocating pump piston 26, which fits tightly but slidably into the cylinder bore and is held at the front, closed end 27 (Pig «3) of a hollow, tubular piston rod 28» 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 Pigo9), which is arranged in an oil storage container 32 (Pig.2 and 6), which is arranged on the rear part of the frame and in a known manner is driven by a gasoline engine 33.

By means of a valve arrangement 35 (Pig »6) arranged in the housing 17, each cylinder 24 of the concrete pump is alternately connected to the storage container 10 and the transport, initially in order to receive a batch of concrete from the storage container through one of the inlet openings 19 and one of the suction openings 25 when the associated piston 26 goes back and then to pump the charge back through the suction opening and through one of the outlet openings 21 and into the transport line when the piston moves forward. "And moved so that one piston pumps concrete into the transport line on its forward stroke, while the other piston sucks concrete from the storage container into its cylinder on its return stroke." The valve arrangement has closure members 36 and 37 for closing the outlet openings of the individual pumps during filling to ensure full filling and to shut off the inlet openings of the individual pumps when the latter are pumping to ensure that the entire batch is conveyed into the Tranaport line »

In accordance with an essential aspect of the present invention, the flow of concrete into and out of pumps 22 and 23 controlled by a new and improved valve 35, in which the closure members 36 and 37 as a single, formed as a single 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 moves more easily through the concrete than known valves used for similar purposes.

For this purpose, the closure members are one piece with one another and are mounted in the housing in such a way that they can be swiveled back and forth between two positions about an essentially horizontal axis synchronously with the reciprocating movement of the pump ο when the valve vibrates first closure member 36 along an arcuate path which runs above the axis and below the storage container 10, and alternately closes the inlet openings 19, and the second closure member 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 a metallic contact between the closure members and the housing is reduced to a minimum, whereby the wear of the valve is reduced ι and the closure members are shaped so that they move through the concrete with an inevitable cutting effect »

In the present example, the housing 17 for the valve 35 is a cast part with opposite parallel side applications 38 (Pig. 6 and 7) which are connected to one another at their rear edges by a vertical and transverse rear wall 39. The upper edges of the housing walls are _n bent ash outside and form a, iet upward Plansch 40 which is bolted to a complementary Plansch 41 which is bent at the lower end of the reservoir 10 to the outside, whereby the reservoir is attached to the housing "From a substantially vertical partition 42 projects from the middle 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,

oil is connected to the opening 18 in the storage container via the inlet openings 19 which open upwards. These inlet openings 19 are delimited by the partition! and the side walls 38. At its lower end, the partition wall is provided with a lower part 45 which has a rounded lower surface which gradually merges into the side wall and forms a curved base for the housing. The suction openings for the pump cylinders are formed in the rear wall 39 near the lower end of the flow channels and open into tubes (FIGS. 3 and 6) which are arranged at a lateral distance from one another and are made in one piece with the rear wall aind connected to the outlet or front ends of the Purapen- Zl linder 24 as shown in Figure 3 most clearly isto

D: l3 Torderwand of the housing 17 is formed by a flat vertical cover plate 47 (Figure "8) detachably to a shaped U-substantially spacer plate 48 (Fig _o 6 and 8) is screwed, which at the front edges of the side walls 38 and attached to the bottom of the housing eats "the cover plate closes the front sides of the DurchflaSkanälf 43 and 44 from fully down to each other provided at a lateral distance in d.er cover plate openings lead di3 ^Z Hem pants piece 20th These openings provide the outlet openings 21 (FIGS. 3 and 8) for the pumps 22 and the and are aligned with the suction openings 25 so that they form an essentially straight flow path between the pumps and the trouser piece.

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T ^ BB latter consists of a pair of separate and spaced apart in aeitliohem extending tubes 49 'are aligned with the outlet openings and unite into a single aioh forwardly projecting spout 50, which is connectable to the transport line. Thus, UQT flows of the concrete from the reservoir 10 to the flow channels 43 and 44 of the housing through the inlet openings 19 and from the channels in the pump cylinder through the suction openings 25. When the concrete is pumped out of the cylinders, it flows back through the suction openings, Via the bottoms of the channels and through the outlet openings 21 into the bore 49 and finally into the CMIlIe 50 and the transport for bringing it to a desired location.

In order to enable the valve 35 and the housing 17 to be kept from 6 mm concrete after each pumping operation, the fitting 20 is pivoted away from the housing so that the outlet openings 21 are exposed and water, filches on top for flushing the housing in this and the fontiX is introduced through the outlet openings. For this purpose, a pair of outwardly projecting eyes 51 (FigoS) are provided on one of the side walls 38 - a housing at a vertical distance from one another. These grip via an attachment 52, which is attached to the rear end of the pants-piece. The pants-piece is articulated to the side wall by a vertical pin 53 that goes through holes in the eyes and the attachment. On the opposite side, the pants-piece is attached to the side wall by a removable bolt 54 or other suitable fastening means, which passes through holes in the eyes 55

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uad an approach 55a on the side wall or the trouser piece is inserted through. Thus, by removing the bolt around the pin 53, the pants-piece can be removed from the Housing are pivoted 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 for cleaning purposes. In addition, the valve 35 by pivoting the pants piece from the housing and by unscrewing the cover plate easily for the purpose of Repair or replacement exposed.

As in the Pig. 6 to 8 is shown, the valve is keyed to the front end of a horizontal shaft 56 which protrudes through the rear wall 39 and the partition wall 42 of the housing 17 to the front and is pivoted in a socket 57, which is mounted in the (partition is arranged just above the level of the inlet openings. at the rear end of the shaft is a crank 58 ( "Pig. 1, 7 and 9) fixed $ which is connected to a servo-operated mechanism 59, back through the valve between the two Tentilstellungen and herschwenkbar isto in the present example, this mechanism is fixed externally to the rear wall 31 of the housing 17 and includes a pair of pistons 60 and 61 (Fig 9 _o)> which are connected out 63 in a pair of cylinders 62 and by a common piston rod 64 together The latter is driven by a pin 65 which extends transversely through the piston rod and is hinged at the free end of the crank _E to the crank 58 in driving connection manure.

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Brueköl is eingelaaaen only into the cylinder 62 and the piston rod 64 öann to move laterally in opposite directions and forth over the crank daa valve between the two layers and h "jr swing shut _β in the cylinder 63 '

The valve is equipped with a circular hub 66 (Fig. 6) provided that in a recess 6? protrudes into the partition wall, with a sector-shaped plate attached to it 68 extends radially and substantially upward from the hub. Because of the spacer plate 48, the cover plate is in place at a distance in front of the front surface of the partition wall 42 and forms a vertically extending gap 69 (FIG. 3), through which the sector plate 68 pivots when the valve vibrates with the shaft 56.

The first valve closure member 36 controls the flow of concrete out of the reservoir into the Burchflußkanäle 43 nnü 44 "by alternately the intake ports 19 opens and closes, and consists of a curved metal plate, the lot provided at the upper end of the sector plate 68 and rearwardly protrudes «. In one position of the valve (Pig. 8), the curved plate 36 sticks off the inlet opening 19 for the flow channel 43 and also 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) covers the inlet opening of the channel 44 and shuts off the flow of concrete to the pump 23. In each valve position the curved plate protrudes between one of the housing side walls 38 and the partition wall 42, with the lower sides of alternating beveled ends of the plate on an insert 69a sit up,

oar is inserted in the upper part of the partition which prevents the passage of concrete into this channel across the partition _β The upper and lower surfaces of the plate are curved concentrically about the axis of the shaft 56 and as a result the curved upper surface intersects smoothly through the concrete, and the lower surface passes the top of the partition at a narrow distance when the valve pans back and forth »To keep the metallic contact between valve and housing as low as possible, the rear edge of the curved plate moves in an in The arcuate gutter 70 formed on the rear wall 39 and is spaced approximately 1 mm from the top and bottom surfaces of the groove. This arrangement prevents that "concrete between the trailing edge of the gekrümraten plate 36 and the rear wall 39 flows down, but prevents wear and which would be caused by directly rubbing the plate against the back wall _o In addition, the upper surface of the plate extends in each of the The valve positions are tangential to the side walls 38, and thus the valve has no edges which are brought into contact with the side walls and which would cause chunks of stone to be ground up or broken between the valve and the housing. As a result, the life of the valve is increased while the power required to move the valve and reciprocate is decreased.

In the present example, the second valve closure member 37 for controlling the outlet openings 21 is a paddle-shaped plate that sits firmly on the hub 66 and lies in 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 partition 42 and the cover plate 47 with the rear surface of the paddle plate passing close to the front surface of the partition. 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 which is cut into the lower part of the spacer plate 48 on the housing 17, such that it is not in rubbing contact with the spacer plate. 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 plate is sufficiently wide to be in either position of the valve to cover one of the outlet openings 21 (FIGS. 3 and 8) and is angularly offset from the curved plate 36 such that, when the valve is in the position shown in FIG. 7, the paddle plate closes the outlet opening of the pump 22 ₉ during the curved plate 36 closes the inlet opening for the pump 23. In the other valve position (J ¹ Ig ₀ S) the plates are pivoted through an angle of approximately 90 ° and so the paddle plate covers the outlet opening for the pump 23 and the curved one Plate covers the inlet port for pump 22. Since the valve swings in synchronism with the reciprocating motion of the pumps, each pump receives a batch of concrete through its oven ne 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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■ / Γ

through her © outlet opening and into the 3? _r anaportleitung, while its inlet port is closed by the curved plateo

In order to reciprocate the pistons 26 of the concrete pumps, the actuation pumps 29 and 30 supply pressure oil from the pressure pump 31 to the tubular piston rods and cooperate with the latter to forward the concrete pistons under the influence of the oil pressure · press addition are connected by a closed hydraulic circuit with each other so the two Betätigerpumpen that a forward movement of a concrete piston dee triggers other piston a corresponding but opposite movement. for this purpose, each Betätigungspuiape a fixed cylindrical piston 73 _s which dense, but slidably fitted into the bore of the piston rod and forms one end of a pressure-tight chamber 74, while the rest of the chamber is delimited by the closed end 27 and the inner wall of the piston rod. ? / ärtigen end rigidly on a fixed path The member is attached and forms a longitudinal channel 76 which is connected to the oil pump 31 and runs through the actuating basket »73 into the chamber 74.» When return oil is pressed through the channel into the chamber, the pressure is supported on the actuating piston 73 and thereby causes the piston rod 28 to slide forward on the actuating piston and push the concrete piston 26 forwards or to the right in Pig »3»

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3> he closed hydraulic circuit for retracting the concrete purple piston 26 is formed by an outer tube or sleeve 77 which is coaxial with the inner tube 76 of each actuating pump 29 and 30 and spaced from the inner tube such that a longitudinal channel 78 between the sleeve 77 and the tube 76 is formed. At its rear end, the sleeve 77 is fastened to a cap 79 on the frame 12, while the front end of the sleeve pushes telescopically 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 cer sleeve form a chamber 80, which at its front End by the actuating piston 73 and at its rear end by a liner 81 provided with a flap is completed, which is in the rear end of the piston rod is screwed in and slid on the sleeve 77. The chamber 80 is with the channel 78 through openings in connection, which is provided in the front end of the sleeve in the Sähe öes actuating piston 73, and the channels 78 of each actuating pump are connected to one another via a cross tube 83, which has openings 84 (FIG. 4), ciie are provided in each cap and in the rear end of each sleeve. With this arrangement The chambers 80 and channels 78 of the two actuation pumps together with the cross tube 83 form a closed one hydraulic circuit between the pumps, and crieaer Kr sis is always with a constant oil volume filled * Therefore, if one of the piston rods 28 slides forward under the influence of pressure medium which is introduced through the channel 76, it moves with it

A socket 81 provided with a splash towards the actuating cable 73 and thereby reduces the size of the associated chamber 80 and forces the oil out of it through the openings 82 and into the channel 78. From this channel 01 flows into the cross tube 83 and then into the channel 78 and the chamber 80 of the other actuating pump. When the pressure medium enters the opposite chamber 80, it exerts a pressure between the rear of the actuating piston 73 and the lapped sleeve 81, thereby pushing the piston rod 28 back on the actuating piston 73 and the Concrete piston 26 withdraws "In the closed circuit there is no flow of oil except that between the two actuating pumps, and the direction of this flow is reversed periodically so that the concrete pistons 26 are alternately withdrawn _e

To move the concrete pistons 26 back and forth in unison, but in opposite directions, and the valve «Swinging back and forth synchronously with the in-and-out movement of the pump pistons, oil from the pressure pump flows through a single four-way valve 85 alternately in the channels of the actuation pumps 29 and 30 and also in the cylinders 62 and 63 of the pivot mechanism 59 initiated. The four-way valve 85 is operated automatically by the movement of the concrete pumps controlled.

As shown in FIG. 3? Igo9, the pressure pump 31 draws oil from a storage container 32 through a line 86 and pumps this through a supply line 88 into the housing the valve 85.

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Depending on the position of a slide 89, it can be displaced Located in the valve housing 87, oil flows from the housing 87 into one of a pair of conduits 90 and 91, which connects the valve housing with the channels 76 of the actuating pumps 29 and 30 o If the slide, as shown in FIG. 9, is arranged as pressure medium from the pressure pump 31 into the line 90 and then introduced into the channel 76 and the chamber 74 of the actuation pump 29 and pushes the piston 26 of the Concrete pump 22 forward “The piston of the other concrete pump 23 is moved back at the same time because of the closed hydraulic circuit between the pumps, and as a result, oil in chamber 74 of actuation pump 30 flows through passage 76 and line 91 into the Valve housing and then via a return line 92, the is connected between the valve housing and the reservoir, into the reservoir. It also flows Oil from line 90 via branch line 93 which connects to cylinder 62 for pivoting the valve is, and pushes the piston rod 64 to the left (Fig »?), whereby the concrete valve 35 according to the state of the Concrete pumps is switched. The oil from the cylinder 61 flows through a branch line 94, which is connected to the line 91 is connected. Since less power is required to move the valve back and forth than is necessary to To move the pumps back and forth, the valve switches to its correct position just before the piston 26 is Forward stroke begins.

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 (Fig. 9) and pivots the lever counterclockwise around the pin on the frame.

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 creates a pressure medium connection between the supply line 88 and the line 91 produces the one to the channel 76 of the actuating pump 30 * Accordingly, the piston 26 of the concrete pump 30 is then pushed forward, and the piston of the concrete pump 22 becomes moved back, the pressure medium from the chamber 74 through the line 90 into the valve housing 87 and from there over one connecting the valve housing 87 to the return flow line 92 Return line 98 to the reservoir 32 from. At the same time, oil is added to the branch 94 and the Cylinder 63 supplied, whereby 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 of the pump 23 begins its forward stroke. The valve slide 89 is brought back to the age shown in Fig. 9, when the piston of the concrete pump 23 reaches the end of its forward stroke and the flange on the associated one Bushing 81 engages at the opposite end of the lever 95 and rotates it clockwise. Accordingly the valve slide becomes one of its two each time 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 actuation 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 is the flow of concrete to the transport pipe essentially continuous during the entire pump operation

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.19-

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 (Fig. 3) on each piston rod and a connecting nut part 101 (Fig. 5) on each piston, these two connecting parts interlocking in such a way 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 Figo3, the connection father is}. a short cylindrical extension 102 protruding from the closed end 27 of the piston rod and provided at its forward end with an annular button or head 103. The forward end of the rod and the rear of the head 103 form a pair of shoulders axially spaced from one another which together with the shoulder 102 delimit an annular groove 104 between the head and the end of the rod. The connecting nut part 101 (Fig. 6) contains a flat washer 104a at the rear end of the piston and a semicircular Idppe 105 which protrudes axially from the washer and at its free end is provided with a retracted radial collar 106 " T.ln pair of lugs 107" which protrude from the lateral ends or legs of the collar cooperate with the latter in the form of a downwardly open, U -shaped recess 108, which has a lateral width of slightly larger diameter than that of the extension 102 of the connecting father part dance »

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as shown most clearly in Figures 3 and 9, fits the collar 106 on the piston 26 into the hat 104 which passes through the connecting father is formed with the lip engaging over the top surface of the head 103 and the lugs 10 7 ride on the shoulder 102 »Opposite surfaces of the collar and the shoulder 107 rest on the shoulders, which are formed by the head and the end of the piston rod and prevent axial movement of the piston, while the U-shaped recess 108 decouples the Rod and the piston allowed 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 piston contains a pair of iJummihülsen 135 (Fig. 9), which over the shaft 136 of a Bolt 136 is pushed, which is screwed into the disc 104a o The sleeves are between the disc 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 all concrete, who see could possibly work past the front stripping edge on the forward stroke, on the return stroke through the rear scraper edge conveyed to the back 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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About frame 12 and the cylinder 24 are arranged so that they allow easy access to the pistons 26, thus allowing 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 caot-shaped spaces 109 (Pig ·?) mounted, the has an open top and longitudinal dimensions that are greater than the length of the piston. The cylinders 24 are mi '; 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 the rear wall of the intermediate frame are attached and after vo: m protrude into the cylinder. When pumps 22 and 23 are working « ten, 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 »3 pistons connected to the rods« wine, however, a piston exchange is required the piston rods are pushed back by hand, so that you can pull the pistons out of the cylinders and into an opening formed by the intermediate frame, as is shown in Fig.3 in dashed lines o The Pistons are then completely free and can of the Rods are lifted off and replaced by pistons, which are provided with new rubber sleeves 135o

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

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It used to be common practice to block each side of the wheels 13 or to raise and jack up the frame hydraulically, to keep the frame stable, although these operations required a considerable amount of installation and dismantling time » According to another aspect of the present invention this provides that the frame and the wheels are relative to one another 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 actuating the hydraulic lifting elements. »For this purpose, each Rail 15 on which the wheels sit, pivotable at 116 with the lower end of a vertical pillar 117 (3? Igo1 and 2) connected, which in one on the side of the Frame-attached vertical U-piece 118 is guided displaceably β TJm the movement of the rails around the pivot point 116 are semi-elliptical springs between the top of the rails and splash 120 provided * which protrude outwards from the pillars 117. Pie piston rods 121 of the hydraulic lifting members are attached to the upper ends of the pillars 117 and slide in cylinders 122 rigidly attached to the frame,

In Pig * 2 the trailer is shown in the transport position, the frame 12 being at a distance above the ground and the pillars being in the lower ends of the U-pieces 118 are In this position, oil is applied to the lifting elements, which is transported through a line 125 (Pig »9) in the cylinder 122 is initiated o The line 125 is connected to the pressure pump 31 and is operated by a Valve 126 masters ο

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Ura lowering the frame in operation, it is only necessary to open the valve 126 and a valve 127 in a return line 128 and thereby drain the oil from the cylinders, whereupon the frame slides down on the pillars and relative to the wheels. As a result, the sheets can be lowered in seconds, ^S he 8aß directly on the ground or under it "= planks laid seated, and therefore during the operation of pumps in a very stable condition

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Claims (13)

RA. ίι 1.5 411 * 25.7.67 -24 protection claims 1) Device, especially for pumping flowing concrete, with a housing in which first and second flow channels are provided at a distance next to each other, the first and second at a lateral distance from each other arranged inlet openings run downwards and with the first and second at a lateral distance mutually arranged outlet openings are in communication, the latter side by side in the lower part the flow channels open, and with a valve body in the housing about a predetermined axis between can be swiveled back and forth in 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 Oscillating 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 can be pivoted back and forth during the oscillating movement in this plane is so that it closes the outlet opening (21) of each flow channel when the inlet opening of this Channel is open. "25" = 25- 2) Device according to claim 1, characterized in that that the valve has a hub (66) and a vertical plate (68) extending from the hub (66) upwards protrudes that the first closure member consists of a curved plate (36), the upper and lower Surfaces are curved concentrically about the axis (56), and that the second closure member consists of a plate (37) exists, which protrudes radially downward from the hub (66) and was located in a plane perpendicular to the axis 3) device according to one of the preceding claims, characterized in that that above the housing (17) a storage container (10) for receiving a quantity of flowing concrete to be pumped is arranged, which has an open lower end (18) with the inlet openings (19) of the housing (17) is connected so that a stream of concrete enters the flow channels under the influence of gravity, 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) are opened and closed alternately and control the flow of concrete, -26- that the second closure member (37) in the first valve position over the second outlet opening (21) lies and this closes and lies in the second valve position above the first outlet opening and closes this » and that means for reciprocating the pumps / (22,23) and for pivoting the valve body (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 (39p 47), which connect these side walls to one another, and in that the flow channels of the side walls and a vertical partition wall (42) are formed, which is arranged between these side walls (38) and extending longitudinally from an end wall (39, 47) to the other ₀ 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" and that the first closure member (36) is one upwards is an inverted plate that swings on a path running between the side walls (38), wherein the lower surface of this 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 walls (38) runs o 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 hand which in this groove (70) is movable » 8) Device according to one of claims 4 to 7, characterized in that that the partition (42) ends just before the other end wall (47) and one that runs vertically Forms slot (69) between this end wall (47) and the opposite surface of the partition wall (42), and that the second closure member is a plate (37) which is arranged in a vertical plane and can be swiveled through this gap during the visual swinging movement of the valve body (35) * -28- 9) Device according to claim 8, characterized in that the housing (17) with an arcuate curved Bottom inner surface (72) is provided, and that the second closure member ^ plate (37) with a provided correspondingly curved lower end (71) is, which moves closely over this surface (72) during the oscillating movement of the valve body (35) » 10) Device according to one of claims 3 to 9 »characterized in that that the cylinder (24) with the flow channels via laterally adjacent suction openings (25) in Are connected, which are provided in an end wall (39), and that the outlet openings (21) in the other end wall (47) are formed and aligned with the suction openings (25) so that a substantially straight The flow path from the cylinders (24) to the outlet openings (21) is produced 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, »29- that at one end of the piston rod a connecting father part (100) is attached, which is an annular Has shoulder (103) which sits at an axial distance from the end of the piston rod (28) and a hanging groove (104) delimits between the shoulder (103) and the end of the piston rod (28), and that at the end of the piston (26) facing the piston rod (28) a connecting nut part (101) a misshapen collar (106) is provided which extends over the connecting father part (100) and into the groove (104) engages and acts on the shoulder (103) so that a decoupling movement of the piston (26) axially to the Rod (28 *) is prevented while there is a decoupling movement of the piston (26) radially to the piston rod (28) allows o 13) 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 guided in this way, that it is between a transport position $ in which the frame (11) is above the level of the supporting surface is arranged and the weight of the Eahraens (11) is carried by the chassis units, and an operating position in which the frame is on the supporting On the surface and the chassis units essentially bear none of its weight, and are movable and that between the chassis units and the frame, a lifting mechanism (115) is provided through that the frame (11) can be raised from the operating position to the transport position » = 30 = 14j device according to claim 13, characterized in that that each of the Pahrgeatelle units one lengthways 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 midst of its center is, nnö that the vertical member (117) is guided up and down on the frame (11) relative to the frame (11).