EP3497329A1

EP3497329A1 - Thick stock valve

Info

Publication number: EP3497329A1
Application number: EP17748765.9A
Authority: EP
Inventors: Felix Weber
Original assignee: Putzmeister Engineering GmbH
Current assignee: Putzmeister Engineering GmbH
Priority date: 2016-08-11
Filing date: 2017-08-04
Publication date: 2019-06-19
Anticipated expiration: 2037-08-04
Also published as: WO2018029099A1; KR102334498B1; KR20190038852A; CN109804161B; EP3497329B1; EP3282125A1; US20200182230A1; CN109804161A; JP7019924B2; JP2019525106A

Abstract

The invention relates to a thick stock valve having a first through-opening (27), having a second through-opening (28) and having a valve member (32) associated with both through-openings (27, 28). The valve member (32) is mounted so as to be able to pivot about a pivot axis (36), wherein the valve member (32) has a sealing face (38) that is curved concentrically with the pivot axis (36). In a first state (30), the valve member (32) releases the first through-opening (27) and closes the second through-opening (28). In a second state (29), the valve member (32) releases the second through-opening (28) and closes the first through-opening (27). The valve member (32) comprises a sealing part (35) and a pivot part (34), wherein the pivot part (34) is mounted so as to be able to rotate in the pivot axis (36) and wherein the sealing part (35) is connected to the pivot part (34) via a connection structure (37). The thick stock valve according to the invention is of simple construction and can be used to produce a continuous material flow in the direction of an outlet (23) of a thick stock pump.

Description

Thick stock valve

The invention relates to a thick matter valve having a first passage opening, a second passage opening and a valve member which interacts with both passage openings.

Such valves are used for conveying thick materials, such as fresh concrete or mortar. There is a first conveying state, in which the thick matter passes through the first passage opening, and a second conveying state, in which the thick matter passes through the second passage opening ^¬ . The thick matter valve serves to release the appropriate passage for the respective passage passage for the thick matter.

High-density valves, in which a valve member is associated with two passage ^¬ openings are known, see DE 10 2013 215 990 AI, US 8,827,657, DE 195 93 986 AI, DE 10 2005 008 938 AI. The valve member has the form of an S-shaped pipe section, one end of which can be selectively coupled to the first passage opening or the second passage opening. This is mechanically complicated.

The invention has for its object to introduce a thick matter valve, which is simpler. Based on the ge ^¬ called state of the art, the problem is solved with the Features of claim 1. Advantageous embodiments are given in the dependent claims.

In the case of the thick material according to the invention, the valve member assigned to the two passage openings is pivotably mounted relative to a pivot axis and has a sealing surface which is curved concentrically with respect to the pivot axis. In a first state, the valve member releases the first passage opening and closes the second passage opening. In a second state, the valve member releases the second passage opening and closes the first passage opening. In a variant of the invention, the valve member comprises a sealing part and a pivoting part. The pivoting part is rotatably mounted in the pivot axis. The sealing part is connected via a connection ^¬ structure with the pivoting part

The inventive design, there is a simple spatial association between the passage openings and the pivot axis of the valve member, whereby a constructive simp che design of the thick matter valve is possible. If the sealing part is connected via a connecting structure with the pivoting part, a reliable sealing effect between the sealing part and the passage openings can be achieved. Thick cloth is a generic term for media that are difficult to convey. The thick matter may be, for example, a substance with coarse-grained constituents, a substance with aggressive constituents or the like. The thick matter can also be a bulk material. In one embodiment, the thick stock is fresh concrete. Fresh concrete contains grains up to a size of more than 30 mm, binds, forms deposits in dead spaces and is therefore difficult to convey. The valve member may be arranged in an interior of the thick matter valve. The thick material of the invention alve may be designed so that the thick matter entering through the Durchtrittsöff ^¬ voltages in the interior of the thick matter entils. The thick matter valve can additionally comprise an outlet opening through which the thick material that has entered leaves the valve again. To the output port, a pipe may be connected, through which the further transport of the thick matter takes place. The path between the passage openings and the exit opening can be arranged such that it does not extend through the valve member.

The first and the second passage opening may each have ei ^¬ ne sealing surface, which is adapted to cooperate with the sealing surface of the valve member. In the sealing ^¬ surface may be, for example, around an inner surface of a housing of the thick stock valve, which extends around the passage opening. The sealing surfaces of

Through openings may have a curvature concentric with the pivot axis of the valve member. Due to the concentric curvature of the cooperating sealing surfaces, the valve member can be rotated about the pivot axis, which corresponds to the axis of the curvature. This makes it possible that ei ^¬ ne of the openings is freely flowed through, while on the other hand, the sealing surface of the valve member cooperating sealingly with the sealing surface of the other passage opening. The term densities is to be understood with reference to the field of application in which 100% tightness is not required. In one embodiment, the concentric curvature corresponds to a segment of a cylinder jacket, wherein the cylinder axis is equal to the pivot axis. In this embodiment, the radial distance between the sealing surface of the valve member and the pivot axis over the length of the pivot axis constant. Also included are embodiments in which the radial distance varies along the pivot axis. In any case, the curvature in the circumferential direction may correspond to a circle segment.

Between the first passage opening and said second passage opening between a surface can be arranged, which also has a concentric to the pivot axis of buckle on ^¬. As a result, a continuous contour concentric with the pivot axis can be created, which extends from the first passage opening via the intermediate area to the second passage opening.

In addition to the aforementioned switching states in which the valve member closes the first or the second passage opening, the thick matter valve may include a third switching state (Zwischenzu ^¬ state), in which both the first passage opening and the second passage opening are released. In the intermediate state, the valve member may be arranged between the first passage opening and the second passage opening. The distance between the two passage openings can be so large that both passage openings are completely released. This has the advantage that the edges of the sealing surface are not exposed to the flow of material extending through the openings. It is also possible that one or both passage openings are still partially covered by the valve member.

The valve member may be a sealing part and a pivot part comprehensive sen, wherein the pivot member in the pivot axis being rotatable gela ^¬ device. At the pivoting part, a motor drive can engage ^{¬ to} effect the switching operations between the various states of the high-density valve. The valve member may include a connecting structure that establishes a connection between the sealing part and the pivoting part. The connection structure may be configured to be rigid with respect to torques that are relative to the pivot axis. Rigid in this sense means that with a rotation of the pivoting part relative to the pivot axis and the sealing part fully ^¬ pulls the corresponding pivoting movement.

Relative to the radial direction, the connecting structure can be a movement of the sealing portion to the pivot member zulas ^¬ relatively sen. By such a relative movement, the radial distance between the sealing surface and the pivot axis can be adjusted so that the desired sealing effect is established between the valve member and the passage opening.

The connecting structure may comprise an elastic element arranged between the sealing part and the pivoting part. In the initial state of the thick stock valve, the elastic ele ^¬ ment may be compressed. If wear occurs between the sealing surfaces during operation, the elastic element expands. The wear is thus automatically compensated ^¬ off.

Additionally or alternatively, the valve member according to the invention may include a drive to move the sealing member in the radial ^¬ direction relative to the pivoting member. The drive can be used to adjust the position of the sealing part to the pivoting part in operation. It is also possible to use the drive to adjust the spring tension of the elastic element. The drive can for example be a hydrauli ^¬ shearing drive or a mechanical drive. In a variant, the valve member comprises a rigid connec ^¬ tion between the sealing surface and the pivotally mounted shaft and the pivotally mounted stub shafts. A rapid movement of the Diale sealing surface relative to the Ventilge ^¬ housing can result if the shaft or the stub shafts are elastically mounted relative to the valve housing. For example, one or more elastic elements may be provided that extend around the shaft or stub shafts. This embodiment has the advantage that the elastic elements are not affected by the Dickstoffström.

The valve member may be arranged in a housing of the high-density material valve according to the invention. The valve member can be arranged Benach ^¬ beard to an end wall of the housing, wherein the end axis is aligned at right angles to the pivot axis. The pivoting movement of the valve member then runs paral ^¬ lel to the end wall. The valve member may be spaced from the end wall, so that the coarse-grained constituents of the thick matter space between the valve member and the end wall have space. Thus, the operation of the valve member he facilitated ^¬ . In an alternative embodiment, the distance between the valve member and the end wall is smaller than the coarse-grained constituents of the thick material. The valve member may comprise a Krat ^¬ zer, which pushes the thick matter along the end wall to the side upon actuation of the valve member, so that no grains between the valve member and the end wall can be clamped. The scratch may rest on the bulkhead or be slightly away from the bulkhead. The housing may have a second end wall, so that the valve member between the first and the second end wall is arranged. The interaction between the valve member and the second end wall may be designed accordingly.

A shaft of the valve member may be mounted in the housing of the thick material ^¬ valve. In this case, two bearings may be arranged so that they enclose the valve member between them. Between the bearings, a shaft may extend, which is a part of the pivoting part of the valve member.

Alve the thick material of the invention may be designed so that a straight connection path between an input ^¬ opening and the output opening of the thick matter entils

Swivel axis cuts. A shaft of the valve ^¬ member extends continuously along the pivot axis, the Mate ^¬ rialstrom must be passed along a curved path on the shaft. In order to keep the flow resistance low, the valve ^¬ member may comprise a guide surface with which the material flow to the shaft is passed over. The baffle may connect to the sealing surface (relative to the direction of movement of the valve member) and define a substantially straight path past the valve member and past the pivot axis. The Leit ^¬ surface may be a planar guide surface, which may be aligned in particular par ^¬ allel to the pivot axis. At its end adjacent to the exit opening, the guide surface may be provided with a recess to facilitate the passage of material flow into the exit opening. The valve member may comprise two such baffles, the sealing surface being enclosed between the baffles. Depending on the switching At the end of the valve, the material flow can be directed either along one and / or the other guide surface.

Such a guide surface may be particularly advantageous if the valve member is designed so that the

Swivel axis is included in the body of the valve member. The elastic member of the valve member may extend around the shaft of the valve member or between the

Be arranged pivot axis and the sealing surface.

In order to keep the flow resistance low, the shaft may comprise two stub shafts, which are guided in bearings of the valve housing. The connection between the two stub shafts can be produced via a connecting structure whose distance from the sealing surface is less than the distance between the pivot axis and the sealing surface. By the Ver ^¬ bond structure does not extend along the pivot axis but is located closer to the sealing surface, there remains a free space which is available for the material flow on its way to the outlet opening. In particular, the connecting structure may be configured so that a straight line extending from the center of the non-occluded passage ^¬ opening to the center of the outlet opening, the valve member does not intersect.

For the connection between the shaft and the sealing part, the connecting structure may comprise a leg which extends to the sealing part. In particular, the leg can be oriented in ra ^¬ dialer direction. Based on the sealing part of the leg can be arranged centrally. If the leg has a distance to the end walls of the valve housing, it can be well flowed around by the thick material. It is also possible that the connecting structure comprises two legs which extend in the direction of the sealing part. The legs may be parallel to each other and aligned in the radial direction. The legs may be arranged so that an area arranged between the pivot axis and the center of the sealing ^¬ part is kept free, so that it can be flowed through by the thick material. Based on the distance between the pivot axis and the sealing surface of the valve member, the freed area may extend over at least 10 -6, preferably at least 30%, more preferably at least 50%.

The two legs may have a distance to the end walls of the housing. Alternatively, the legs may be formed as scratches, so that the thick matter is pushed aside on a Betä ^¬ tion of the valve member along the end face ^¬ .

If the thick matter valve according to the invention is used so that the flow of material through one of the passage openings in the

Enters the interior of the valve, extends to the valve member by and the valve through an outlet opening again leaves (pumping operation), there is regularly a Druckdiffe ^¬ rence between the interior of the thick stock valve and an Au ßenraum of which is located at the closed with the valve member Passage opening connects. The thick stock valve can be ^so-¬ staltet that a force is exerted on the valve member by the pressure differential, which enhances the sealing effect. If the pressure in the interior is higher than in the outer space, then the valve member can be pressed in the radial direction against the sealing surface of the passage opening. The direction indication radially refers to the pivot axis of the valve member. The Ven For this purpose, the tilglied may comprise an outer surface, by which a pressure applied in the inner space is converted into a force acting in the radial direction. Outer surface refers to an area of the valve member that is in contact with the thick material in the interior of the thick matter valve.

In particular, the valve member may have an outer surface which faces the sealing surface. The outer surface may be oriented to intersect the radial direction perpendicularly. A pressure acting on the outer surface is then aligned so that it directly enhances the sealing effect.

It is also possible that the valve member has a relation to the radial direction inclined outer surface, so that only a portion of the compressive force acts in the direction of the sealing surface.

The valve member may also have two oppositely oriented inclined ^¬ te outer surfaces. Opposing means that the outer surfaces are aligned so that the components acting in the radial direction of the compressive force add.

If the thick material according to the invention is used in such a way that the flow of material flows in the opposite direction (suction operation), then the pressure difference can generally not be utilized in order to increase the sealing effect of the valve member. The sealing effect then results primarily from the force exerted on the sealing part, starting from the pivoting part. As stated, this force can result either from an elastic bias or from an active drive.

The invention also relates to a pump equipped with such a thick matter valve. The thick matter valve may be arranged so that, in a pumping operation, that Organ of the pump in motion staggered material enters through the first and / or the second opening in the interior of the slum valve. The pump may comprise a first delivery cylinder and a second delivery cylinder. In each of the delivery cylinder, a piston can be arranged, which sucks in the pumping operation with a backward movement thick matter in the interior of the delivery cylinder and promotes the thick material in a forward movement in the direction of the passage opening of the high-density valve.

The flow rates of the two delivery cylinders can be separated in front of the thick matter valve and combined with the thick matter valve to a common flow. The delivery flow from the first delivery cylinder may be through the first delivery cylinder

Passage opening of the thick matter valve in the interior of the thick matter valve. The delivery flow from the second delivery cylinder can enter the interior of the thick matter valve through the second passage opening of the thick matter valve.

The pistons may be controlled so that the reverse movement occurs within a shorter time than the forward movement. The beginning of the forward movement of the one piston can overlap with the end of the forward-Be ^¬ movement of the other piston. There is then a period of time, transported in the both pistons material parallel in the direction of the thick matter ^¬ valve. The switching positions of the thick matter valve can be coordinated with the movement of the pistons ^{¬ movement} in the delivery cylinders. The piston of the first delivery cylinder is in the forward movement and the piston of the second delivery cylinder in the backward movement, the thick matter can be entil switched to the first state in which the first passage ^¬ opening is free and the second passage opening is verschlos ^¬ sen. If the piston of the second delivery cylinder is in the forward movement and the piston of the first delivery cylinder is in the backward movement, then the thick matter can be switched to the second state in which the second passage opening is free and the first passage opening is closed. In the intermediate phase, in which the pistons of both delivery cylinders are in the forward movement, the thick matter valve can be switched to a state in which none of the passage openings is closed. Preferably, both passage openings are free in this intermediate state of the thick matter valve.

If the piston of the first delivery cylinder is in the backward movement and the piston of the second delivery cylinder is in the forward movement, then there is a pressure difference across the first passage of the thick matter valve. The pressure in the interior of the thick stock valve corresponds Wesent ^¬ union to the pressure which the piston of the second feed cylinder exerts with its forward movement to the material. Before the first passage opening, the suction pressure of the first delivery cylinder is located, which is much lower. This pressure difference can be used as described above to increase the sealing effect between the valve member and the first passage opening. Conversely, when the piston of the second delivery cylinder in the backward movement and the piston of the first delivery cylinder in the forward movement, so is the corresponding pressure difference across the first opening of the slum valve on. For a switching operation of Dickstoff entils an overlying the valve member pressure difference is a hindrance. The thick matter valve can therefore be set up so that the

Switching then takes place when there is a pressure difference across the valve member, which is reduced relative to this pressure difference. For this purpose, it is advantageous if the Schaltvor ^¬ gear takes place only when the backward movement of the piston is completed, the passage opening is closed with the valve member. Also of advantage may be that the switching process only occurs when the Subject Author ^¬ Fende piston has started its forward motion, so that a pressure already was rebuilt before the relevant passage opening. The thick matter valve can be set up so that the

Shifting is completed before the reverse movement of the other piston begins. In particular, the density solids may be valve set up so that the shift is abge ^¬ closed before the forward movement of the other piston is finished. The switching operation can be designed so that the valve member is moved from a first switching state, in which one of the passage openings is closed and the other passage opening is free, via an intermediate state, in which none of the passage openings is closed, into a second switching state, in which the other one

Passage opening is closed or free. In particular, the pump may be configured so that the switching operations of the valve member are only made when the pressure difference across the valve member is small.

The above statements relate to the pumping operation of the pump. The pump can also be operated in the reverse direction in a suction mode. The suction operation can For example, serve to clean the thick matter entil and a subsequent delivery line or to eliminate constipation in this area. The interaction of the delivery cylinder and the Dickstoff valve is then matched in a reverse manner to each other.

In suction a present across the valve member pressure ^¬ difference has to regularly reduce the tendency, the sealing action of the valve member. The valve member should therefore be ge ^¬ staltet that it also negative under such

Pressure difference has a sufficient sealing effect by a force acting in the direction of the passage opening force is exerted on the sealing part via the pivoting part.

The invention will be described below with reference to the attached drawings beige on the basis of advantageous embodiments by way of example. Show it:

Fig. 1: a vehicle with a sludge pump, which is equipped with a slender valve according to the invention;

Fig. 2 is a block diagram of a with an inventive

Thick matter valve equipped sludge pump (in Hy ^¬ drauliknotation);

3 is a perspective view of a thick matter pump with a thick matter valve according to the invention;

4 shows a sectional view of the pump according to FIG. 3;

FIGS. 5 to 8 are schematic representations of different states of the slurry pump according to FIG. 3;

Fig. 9: a schematic representation of an inventive

Valve member;

Figure 10 is a representation of the forces acting on the sealing part of the valve member ^¬ pressures;. 11 is a valve member of a thick material according to the invention entils in a partially sectioned view;

Figures 12 and 13: valve members in alternative embodiments of the invention; and

Fig. 14 is a sectional view of the embodiment according to

Fig. 13.

On the bed of a truck 14 shown in Fig. 1, a slurry pump 15 is arranged in the form of a concrete pump. The slurry pump 15 includes a prefill container 16 into which the concrete from a supply (not shown) is filled. The slurry pump 15 sucks in the concrete from the prefill container and conveys the concrete through a connection pipe 17 which extends along a distributor boom 18. The distributor mast 18 is mounted on a turntable 19 and can be folded over a plurality of joints, so that the end of the tube 17 can be brought into a spaced-apart position from the truck 14. In this position, the concrete is discharged from the connection pipe 17.

The thick matter pump comprises according to FIG. 2 a first Förderzy ^¬ linder 21 and a second feed cylinder 22. Each feeding cylinders 21, 22 includes a piston, which aspirates with a backward movement concrete from the pre-fill container 16, and with a forward movement of the concrete in Direction of an outlet 23 of the pump promotes.

The first delivery cylinder 21 is associated with a first inlet valve 24. The inlet valve 24 is opened during the backward movement of the first conveyor loading cylinder 21, so that the För ^¬ the cylinders 21 can suck from the concrete pre-fill sixteenth The inlet valve 24 is closed during the forward movement of the first delivery cylinder 21, so that the concrete in Direction pump outlet 23 can be promoted. The second delivery cylinder 22 is associated with a second inlet valve 25, the switching operations are adjusted according to the backward and forward movements of the second delivery cylinder 22.

The pump comprises a thick matter valve 26, which forms a common outlet valve for the first delivery cylinder 21 and the second delivery cylinder 22. The thick matter valve 26 comprises a first passage opening 27 for concrete conveyed with the first delivery cylinder 21 and a second passage opening 28 for concrete conveyed with the second delivery cylinder 22. A valve member 32 of the thick matter valve closes in a first switching state 29, the first passage opening 27 and leaves the second passage opening 28 open. In a second switching state 30, the thick matter valve 26 closes the second through ^¬ outlet opening 28 and leaves the first passage opening 27 open. In a third switching state 31 (intermediate state) both passage openings 27, 28 are open.

The two conveyor cylinders 21, 22 are driven so that the backward movement takes place within a shorter period of time than the forward movement. The beginning of the forward movement of the one conveying cylinder overlaps with the end of the forward movement of the other conveying cylinder. At any time, therefore, at least one of the delivery cylinders 21, 22 conveys concrete in the direction of the thick matter valve 26.

The valve member 32 of the thick matter valve 26 is actively switched over a drive between the various switching states. If the first feed cylinder 21 in the forward-Be ^¬ movement and the second feed cylinder 22 in the reverse movement, the thick stock valve 26 is in the switched state 30, in which only the coming of the first delivery cylinder 21 material flow through the thick material can pass through valve 26. If the second delivery cylinder 22 in the forward movement and the first delivery cylinder 21 in the backward movement, then the Dickstoff is entil 26 in the switching state 29 in which only the coming of the second delivery cylinder 20 material flow can pass through the sludge valve 26. In the Überschnei ^¬ tion phase, in which both conveyor cylinders 21, 22 are in the forward movement, the sludge valve 26 in the intermediate state 31, in which the material flows of both För ^¬ derzylindern 21, 22 through the thick matter valve 26 hindurchtre ^¬ th can ,

Both conveyor cylinders 21, 22 have a basic speed for the forward movement. The base speed of the roughing ^¬ Windwärts movement is applied, while the respective other conveyor cylinder 21 is in the backward movement 22nd By the basic speed of the material flow is defined, which is promoted in this phase towards the pump outlet 23. In the overlapping phase, in which both conveyor cylinders 21, 22 are in the forward motion, the speed is reduced from the base speed so that the speeds of the two forward motions add up to the basic speed. In this way, a constant flow of material towards the pump outlet 23 is maintained even during the overlapping phase.

Fig. 3 shows the sludge pump according to the invention in a perspective view. The inlet valve 25 is in the open state, so that the associated inlet opening 45 of the pump is continuous and that with the second delivery cylinder 22 thick material from the Vorfüllbehälter 16 (Fig. 1) can be sucked. The first inlet valve 24 is in the closed Status. When the piston of the first delivery cylinder 21 is in the forward movement, the material flow moves through the first passage opening 27 of the Dickstoff valve 26 towards the pump outlet 23, see Fig. 4th

The sequence in the operation of the pump will be explained below with reference to the schematic representations of Figures 5 to 8. In Fig. 5A, the valve member 32 of the Dickstoff valve 26 is connected so that it closes the passage opening 27 of the first conveyor 21 and that it leaves the passage opening 28 of the second conveyor cylinder 22. The inlet valve 25 of the second delivery cylinder 22 is closed, see Fig. 5B. The second delivery cylinder 22 is in the forward movement and conveys concrete through the passage opening 28 into the interior of the thick matter valve 26 and to the pump outlet 23.

By the pressure difference across the valve member 32, the sealing effect between the valve member 32 and the passage opening 27 is amplified. The inlet valve 24 of the first delivery cylinder 21 is opened so that the first delivery cylinder 21 can suck in concrete from the prefill container 16 with a backward movement through the inlet port 44 of the pump.

The backward movement of the first feeding cylinder 21 ends earlier than the forward movement of the second feed cylinder 22. In Fig. 6 is shown the state in which the forward-Be ^¬ movement of the first feeding cylinder 21 starts and the forward movement of the second feeding cylinder 22 is about to end. Both inlet valves 24, 25 are closed. The order ^¬ the thick stock valve 26 in the intermediate state 31 off loading begins, after the first feeding cylinder 21 has already established pressure before the passage opening 27 again, so that the valve member 32 only abuts a minor Druckdiffe ^¬ rence. After switching, the thick matter valve 26 in the intermediate state 31 in which the valve element 32 leaves open both the first port 27 and the second passage opening ^¬ 28th In both delivery cylinders 21, 22, the speed of the forward movement is reduced, so that the delivery cylinder 21, 22 now jointly promote the amount of material that has previously promoted the second delivery cylinder 22 alone.

After the end of the forward movement of the second delivery cylinder 22, the inlet valve 25 is opened, see FIG. 7. To relieve the pressure, the second delivery cylinder 22 can already perform a first backward movement before opening the inlet valve 25. When the inlet valve 25 is opened, the second delivery cylinder 22 sucks in concrete from the prefill container 16 with a backward movement through the inlet opening 45 of the pump. The first delivery cylinder 21 moves forward at its basic speed, so that the flow of material to the pump outlet 23 remains unchanged. In Fig. 8, the forward movement of the second begins again

Delivery cylinder 22, while the forward movement of the first delivery cylinder 21 ends. With the end of the forward movement of the first delivery cylinder 21, the cycle ends and the pump returns to the state shown in FIG.

FIG. The valve member 32 of the thick stock valve 26 9 includes a pivot member 34 and a seal member 35. The swing member 34 includes two sections of a shaft 33 about the relative said pivot ^¬ part is rotatably supported on a pivot axis 36. Between the shaft 33 and the sealing part 35, a connection structure 48 shown only schematically in FIG. 9 is formed. Via the connecting structure 48, the radial distance between the sealing part 35 and the shaft 33 can be changed. By contrast, the connecting structure 48 is rigid with respect to torques. Thus, when the shaft by a certain angle rotated so 35 performs the sealing member to pivot about Densel ^¬ ben angle.

The underside of the sealing part 35 forms a sealing surface 38 in the form of a concentric with the pivot axis 36 aligned cylinder segment. The housing of the Dickstoff valve 26 has a matching mating surface, which also has the shape of a Zylin- dersegments. In the opposing face the Durchtrittsöff ^¬ voltages 27, 28 of the thick stock valve 26 are formed. The sealing ^¬ surface 38 of the valve member 32 cooperates with the mating surface of the valve housing and, depending on the switching state of the entwe ^¬ seal the through-hole 27 or the through opening 28th

FIG. 10 shows a state of the thick matter valve in which a higher pressure is applied in the interior of the thick matter valve than in front of the passage opening 27, which is closed by the sealing part 35. The valve member 32 has one of the Dichtflä ^¬ che 38 opposite outer surface 43, on which the pressure of the material in the sludge 26 material acts in the radial direction. The pressure difference from the outside helps to enhance the sealing effect between the valve member 32 and the valve housing. The valve member 32 also has two symmetrically arranged outer surfaces 44, 45. An acting on the outer surfaces 44, 45 pressure of the material also has a component in the radial direction, so that the outer surfaces 44, 45 contribute to enhance the sealing effect.

In the valve member 32 shown in FIG

Pivoting part 34 a pin 50, which in a suitable Ausne mung of the sealing part 35 engages. With the pin 50, a sliding guide is formed, along which the sealing member 35 can move in the radial direction relative to the shaft 33. Compared to forces in other directions, the sliding guide is rigid.

Between the pivoting part 34 and the sealing part 35, a plate 37 is arranged made of an elastic material. The Plat ^¬ te 37 is part of the connection structure between the pivot member 34 and the sealing member 35. By pressure in the radial direction, the plate 37 can be elastically compressed, whereby the sealing member 35 along the sliding guide to the

Swivel part 34 is approximated. The thick material of the invention alve 26 is set to its factory ^¬ state so that the plate 37 is elastically Kompri ^¬ mized and 35 thus abuts the sealing member under a elasti ^¬ rule pressure at the valve housing, the plate exerts in the radial direction 37th If, during operation of the pump, wear occurs on the valve member 32 or the valve housing, then this can be compensated automatically by expansion of the elastic plate 37. In suction operation is ensured by the Plat ^¬ te 37 that a sufficient contact pressure sealing member 35 and the valve housing.

The valve member 32 shown in Fig. 11 is also so decor with dark ^¬ tet, that a free space is enclosed between two stub shafts 33 so that the stream of material to a direct way of the passage openings 27, 28 can move in the direction of the pump outlet 23rd The pivoting part 34 comprises two legs 51, 52 which extend in the radial direction and which enclose the space between them. In the radial direction the free space extends over more than 50% of the distance between the pivot axis 36 and the sealing surface 38.

In the embodiment according to FIG. 12, a free space is also enclosed between two stub shafts 33 in order to facilitate the movement of the delivery flow in the direction of the outlet opening. A central leg 53 extends in the radial direction and is centrally connected to the sealing part 35. Around the leg 53 there is sufficient space for the movement of the flow of material. Incidentally, the connection structure is analogous to FIG. 11 designed with an elastic plate 37 and a sliding guide not visible in FIG. 12.

FIG. 13 shows an alternative embodiment of a valve member 32 according to the invention. The seal member 35 he ^¬ extends around the pivot member 34, so that an Ab ^¬ section of the swing member 34 in the interior of the sealing part is positioned ^¬ taken. According to the sectional view in Fig. 14, the pivot member 34 in the interior of the sealing part 35 has a rectangular cross-section. The sealing part 35 has a slot matching the rectangular cross-section, in which elastic elements 37 are arranged above and below the pivoting part 34, so that the sealing part 35 can move in the radial direction relative to the pivoting part 34, while a relative rotational movement between the Sealing part 35 and the pivoting part 34 is excluded ^¬ . The pivot member 34 includes a lever 39 to which a drive can engage to switch the valve member 32 between the various switching states. The valve member 32 is dimensioned so that it bears with its two axially facing end faces directly to the housing 46 of the thick matter valve 26. The end faces of the Ven ^¬ tilglieds are formed as scratches 55. The scratches 55 push in a switching operation of the valve member 32, the thick matter along the end face of the housing to the side.

The side surfaces 57 of the valve member are designed as guide surfaces. Along the baffles, the material flow in

Direction of the outlet opening of the thick matter valve passed. At its upper side, the valve member 32 is provided with a recess 56, through which the movement of the material flow in the direction of the outlet opening is facilitated.

Claims

claims

Thickener entil with a first passage opening (27), with a second passage opening (28) and with the two passage openings (27, 28) associated valve member (32), wherein the valve member (32) relative to a pivot axis (36) is pivotally mounted , wherein the Ven ^¬ tilglied (32) has a concentric with the pivot axis (36) curved sealing surface (38), wherein the valve member

(32) in a first state (30) releases the first passage ^¬ opening (27) and the second passage opening

(28) closes, wherein the valve member (32) in a second state (29), the second passage opening (28) releases and the first passage opening (27) closes, and wherein the valve member (32) is a sealing part

(35) and a pivoting part (34), wherein the pivot ^¬ part (34) in the pivot axis (36) is rotatably mounted and wherein the sealing part (35) via a connecting structure

(37) is connected to the pivoting part (34).

Thick-matter valve according to claim 1, characterized in that the valve member (32) is arranged in an inner space of the high-density material valve.

Density valve according to one of claims 1 to 2, characterized in that between the first Durchtrittsöff ^¬ tion (27) and the second passage opening (28) an intermediate surface is arranged, which has a to the Schwenkach ^¬ se (36) concentric curvature.

Density valve according to one of claims 1 to 3, characterized in that in a third switching state, the valve member (32) between the first passage opening (27) and the second passage opening (28) is arranged.

Thickener according to one of claims 1 to 4, characterized in that the connecting structure (37) is rigid relative to relative to the pivot axis (36) acting torques.

Thicknock valve according to one of claims 1 to 5, characterized in that the connecting structure (37) in the radial direction al ^¬ a movement of the sealing part (35) relative to the pivoting part (34) permits.

Thick-matter valve according to one of claims 1 to 6, characterized in that the connecting structure comprises an elastic element (37) arranged between the sealing part (35) and the pivoting part (34).

Valve according to one of claims 1 to 7, characterized in that between a shaft (33) of the valve member (32) and a housing (46) of the valve, an elastic element is arranged.

Thick-matter valve according to one of claims 1 to 8, characterized in that the valve member (32) comprises two in the pivot axis (36) mounted stub shaft (33) and that the stub shafts (33) include a clearance between them.

Thick-matter valve according to one of claims 1 to 9, characterized in that the valve member (32) comprises a leg (51, 52, 53) extending between the pivot axis (36) and the sealing surface (38), and in that Leg (51, 52, 53) from an end face of a housing (46) of the Dickstoff valve (26) is spaced.

Density valve according to one of claims 1 to 9, characterized in that the valve member (32) has a scratch (55), which in a switching operation of the Ventilglie ^¬ ds (32) along an end face of the housing (46) of the high-density valve (26) out becomes.

Thick-matter valve according to one of claims 1 to 11, characterized in that the valve member (32) comprises an outer surface (43, 44, 45), by which a via valve member (32) applied pressure difference is converted into a force acting in the radial direction.

Slurry pump with a thick matter valve according to one of claims 1 to 13, characterized in that the thick ^¬ material pump is set up so that the by a conveyor ^¬ organ of the pump in motion staggered material through the first and / or second inlet opening (27, 28) enters the interior of the thick matter valve.

Thick matter pump according to claim 14, characterized in that the thick matter pump is adapted to ^¬ between stands of the thick stock valve (26) switch, when there is no pressure difference across the valve member (32) is applied.