DE102007031254A1 - Wear ring for use in concrete pumps - Google Patents

Abstract

The invention relates to a wear ring for two-cylinder thick matter pumps. The wear ring (44) has a carrying structure (46) provided with at least one circular opening (50) and a plurality of circumferentially extending openings (50) forming an annularly closed flat sealing surface (52) via butt joints (54) the support structure (46) cohesively connected ring segments (48) made of wear-resistant material. According to the invention, the ring segments (48) have edge portions (56, 58) which are complementary to one another in pairs and engage one another in a form-fitting manner in the circumferential direction at their abutment edges bounding the butt joints (54). Another feature of the invention is that the ring segments (48) have an L-shaped cross-section. The wear rings (44) according to the invention can likewise be used in the spectacle plate (32) and as the cutting ring (32) of a diverter valve (18) for two-cylinder thick matter pumps.

Description

The The invention relates to a wear ring, in particular for use in concrete pumps, with a circular opening in the outline having support structure and with a plurality of circumferentially of the opening to form a annularly closed flat sealing surface over butt joints together subsequent, integral with the support structure connected ring segments made of wear-resistant material.

Wear rings of this Type are for example in diverters of two-cylinder concrete pumps needed. Two-cylinder concrete pumps have two delivery cylinders whose frontal openings in a material feed container flow and alternately during the respective pressure stroke over the Diverter with a delivery line connectable and while of the suction stroke while sucking in material to the material feed container are open. The frontal openings the delivery cylinder are through a spectacle-shaped wear plate covered. The pipe switch contains Further, an engaging in the interior of the material feed container pivot tube, the with its cutting ring bearing front side in front of the spectacle-shaped wear plate arranged so that it can be swiveled back and forth about a horizontal axis is that its cylinder-side opening alternately in front of one or the other, each with one of the delivery cylinder communicating opening the wear plate passes and the other opening to the interior of the material feed container releases. For the pressure-tight Connecting the pivot tube to the wear plate is the cutting ring axially displaceable on a cylindrical centering surface of the pivot tube stored. The operation of the pivot tube via a controllable by hydraulic means shift lever. The openings in the spectacle plate have the shape of wear rings, as well as the wear ring designed as a swivel tube side Cutting ring one with a circular opening in the ver-provided support structure and a plurality of to form an annular closed flat sealing surface via butt joints together then, integral with the support structure having connected ring segments made of wear-resistant material. The following versions apply accordingly to the same the spectacle plate and provided on the pivot tube wear rings.

It is known that on the friction surfaces the wear rings a pipe turn segment-shaped plates on a carrier soldered from steel become. For this purpose, the carrier is inserted through a shoulder milled limited seat, in the plate-shaped Ring segments are soldered to form a closed ring. The ring segments are made appropriately a hard metal material with a very low coefficient of thermal expansion. This is when making the solder joint with the substrate, the one much higher thermal expansion has to take into account. Between the ring segments have to column be kept free to internal stresses in the manufacturing process may occur, to avoid. The gaps form joints that are soldered filled become. However, the use of simple plate-shaped ring segments has the disadvantage that in the interior of the openings additional welding jobs of wear-resistant Material are necessary, which inevitably lead to soft material bridges. The Soft material bridges result from that at the crossing points so-called layer thickness transitions between the build-up welding and the hard metal arise where the soft carrier material exposed to wear remains. This also applies to the standing in the production of the insert seat remaining outer investment bond for the Carbide plates. These vulnerabilities intervene with each switching operation from the printing cylinder in the material feed container exiting material beam which leads to washouts at the relevant points. The result conditional hard metal undercurrents gradually lead to a carrier material and loss of strength with the consequence of premature destruction of the entire wear ring. Even with the manufac turing of the known wear rings problems arise, because the welding jobs and the Soldering in two Stages performed Need to become. First the tank material needs to be at a higher temperature welded become. Afterwards, the Ring segments are soldered at a lower temperature. The chronological order This order must be strictly adhered to as the solder material can not be melted again. Another disadvantage of consists of known wear rings in that, that's the jagged lines extending radially in the region of the gaps between the ring segments, so while of the soldering process the danger exists that the ring segments dodge radially outwards. It can larger annular gap with correspondingly small flow resistance for the abrassive Material arise.

outgoing This is the object of the invention, a wear ring for use in thick matter pumps to develop a mechanically stable Structure has, is easy to produce and a comparatively subject to low overall wear.

to solution This object is achieved by the features specified in claim 1 proposed. Advantageous embodiments and developments The invention will become apparent from the dependent claims.

The Solution according to the invention goes from the idea that by a positive connection between the adjacent ring segments in the circumferential direction a toothing between the ring segments, resulting in a simplified assembly and to an improved sealing function and thus to reduce wear contributes. To achieve this, according to the invention proposed that the ring segments at their butt joints limiting abutting edges pairwise complementary, in the circumferential direction positively into one another have gripping edges. According to a preferred embodiment the invention, the two in the circumferential direction opposite to each other Side dishes ten abutting edges of the individual ring segments on one side a concave and on the other side has a complementary convex edge part, at the reaching to the respective outer edge of the ring segments Connect radial sections can. The consisting of hard metal, preferably containing tungsten carbide Ring segments are useful on the Soldered support structure, for which purpose a copper or silver-containing solder material is preferably used. The support structure consists of a ductile material, preferably from steel.

A preferred embodiment of the invention provides that the wear-resistant Ring segments complementary in their entirety to the closed sealing surface Forehead and a perpendicular thereto, to a closed inner boundary surface the opening in the supporting structure complementary Have inner leg, and thus a substantially L-shaped cross-section to have. The inner legs of the ring segments are in the circumferential direction expedient circular segment with the radius of curvature the opening is curved and close over axial running butt joints in the circumferential direction to each other. The butt joints preferably have one Width of less than 0.3 mm and can be partially soldered filled be.

The The invention further relates to a spectacle plate for a diverter valve of a two-cylinder slurry pump, the two bearing a ring insert receiving openings, in which the ring inserts as wear rings are formed of the above type. Basically, it is possible that the spectacle plate with its circular in outline openings itself as a support structure for the Ring segments according to the invention is trained.

The The invention further relates to a cutting ring for a pivot pipe diverter Two-cylinder thick matter pump, which is designed as a wear ring according to the invention is.

One Another object of the invention is a pivot pipe for a pipe switch a two-cylinder slurry pump, which at its cylinder-side End wearing an axially displaceable cutting ring, wherein the cutting ring as wear ring according to the above described invention is formed.

It also concerns the invention a pipe switch for Two-cylinder thick matter pumps with a cylinder-side spectacle plate, the two with pump cylinders communicating, each limited by a ring insert receiving openings and with one in front of the spectacle plate between the two ring inserts swinging back and forth pivot tube, which on his glasses plate side End of a limited axially displaceable, with a frontal sealing surface against the sealing surfaces Press the ring inserts Wearing cutting ring, according to the invention the ring inserts the spectacle plate and / or the cutting ring of the pivot tube as wear rings according to the above described invention are formed.

One Another object of the invention is a two-cylinder slurry pump with a cylinder-side spectacle plate, the two communicating with pump cylinders, by each having a ring insert limited receiving openings, and with one in front of the spectacle plate between the two ring inserts. and herverschwenkbares swivel tube, which on his glasses plate side End of a limited axially displaceable, with a frontal sealing surface against sealing surfaces the ring inserts wears pressable cutting ring, with the ring inserts the spectacle plate and / or the cutting ring of the pivot tube as wear rings the invention described above are formed.

in the Below, the invention with reference to the in the drawing in more schematic Illustrated embodiments explained in more detail. It demonstrate

1 a section of a two-cylinder slurry pump in perspective partially cut representation;

2 a section through the diverter of the two-cylinder slurry pump after 1 with S-shaped pivot tube and inner-centered cutting ring;

3 an enlarged section of the pivot tube of a two-cylinder slurry pump with externally centered cutting ring in a sectional view;

4a a plan view of a spectacle-shaped wear plate of a two-cylinder slurry pump;

4b and c two sections along the section lines BB and CC of the 4a ;

5 a wear ring for use in a spectacle plate with support structure and ring segments in perspective view;

6a and b is a plan view and a sectional view of a wear ring with support structure and ring segments;

6c a perspective exploded view of the wear ring after 6a and b;

7a and b is a plan view and a sectional view of the wear ring designed as a cutting ring according to 2 in an enlarged view;

8a to c is a plan view, a side view and a sectional view of a carbide ring segment;

9 the ring segment after 8a to c in a diagrammatic representation.

In the 1 shown slurry pump has two delivery cylinder 10 . 12 on, whose frontal openings 14 in a material feed container 18 open and alternately during the pressure stroke (arrow 19 ) via a diverter valve 20 with a conveyor line 22 connectable and during the suction stroke (arrow 24 ) with suction of material to the material feed container 18 are open. The pistons 26 . 28 the delivery cylinder 10 . 12 are driven in push-pull with hydraulic means, not shown.

The frontal openings 14 the delivery cylinder 10 . 12 are through a spectacle-shaped wear plate 30 covered. On the inside of the material feed container 18 this is in the embodiment shown S-shaped pivot tube 32 the diverter 20 with her a cutting ring 34 bearing end face in front of the wear plate 30 around a horizontal axis 35 arranged so swiveling back and forth that its cylinder-side opening 36 alternately in front of one or the other opening 14 the delivery cylinder 10 . 12 passes and the other opening 14 to the interior of the material feed container 18 releases. For pressure-tight connection of the swivel tube 32 to the wear plate 30 is at the front end of the pivot tube 32 the cutting ring 34 mounted axially displaceable. The operation of the swivel tube 32 via a hydraulic means 38 controllable shift lever 40 , As in particular from the 2 and 3 can be seen, wearing the pivot tube 32 also a sealing ring 42 on which the on the swivel tube 32 guided cutting ring 34 is axially supported.

A special feature of the invention is that the spectacle-shaped wear plate 30 at their openings 14 with wear rings 44 stocked out of a support structure 46 made of ductile steel and ring segments 48 are composed of wear-resistant material. The ring segments 48 close in the circumferential direction in the support structure 46 located opening 50 forming an annular closed flat sealing surface 52 over butt joints 54 to each other and are in the assembled state with the support structure 46 cohesively connected, preferably with this soldered. Also the cutting ring 34 on the swivel tube 32 forms a wear ring 44 ' , consisting of a supporting structure 46 with a circular opening in outline 50 ' and several in the circumferential direction of the opening 50 ' forming an annular closed flat sealing surface 52 ' over butt joints 54 ' adjoining, with the support structure 46 ' cohesively connected ring segments 48 ' made of wear-resistant material.

Another special feature of the invention is that the ring segments 48 . 48 ' the wear rings 44 . 44 ' at her the butt joints 54 . 54 ' limiting abutting edges in pairs complementary to each other, in the circumferential direction positively interlocking, concave and convex edge portions 56 . 58 have, to which reaching to the respective outer edge of the ring segments radial parts 60 connect. As in particular from 8c and 9 can be seen, have the wear-resistant ring segments 48 . 48 ' an L-shaped cross-section, consisting of a in its entirety to the closed sealing surface 52 . 52 ' supplementary forehead leg 62 and a perpendicular thereto, to a closed inner boundary surface of the opening 50 . 50 ' in the supporting structure 46 . 46 ' supplementary inner thighs 64 , The inner thigh 64 is circular in the circumferential direction with the radius of curvature of the opening 50 . 50 ' curved (cf. 8a ), wherein the inner legs of the ring segments at their side edges 66 over axially parallel butt joints 68 in the circumferential direction connect to each other (see. 2 and 3 ).

The ring segments 48 . 48 ' be used in the production of wear rings 44 . 44 ' with a suitable solder material, for example on copper or silver based on the support structure 46 . 46 ' soldered. This may cause the joint to bend 68 fill at least partially with solder material. During the manufacturing process, the form-fitting interlocking edge sections ensure 56 . 58 for the ring segments 48 . 48 ' can not move radially outward. The edge parts, which are curved in the shape of an outline, roll against one another when they are pushed against each other, so that there are no internal stresses within the material during the joining process composite can build. The interlocking edges 56 . 58 also ensure that the joints in question form a kind of labyrinth seal, which oppose the outflowing material when opening and closing the pipe switch a high, wear-reducing flow resistance. Another significant advantage of the described wear rings 44 . 44 ' is that the L-shaped ring segments 48 . 48 ' form a one-piece element for all wear areas. There are therefore no additional surfacing more necessary.

The described wear rings 44 . 44 ' are both in the spectacle-shaped wear plate 32 as well as a cutting ring 32 used. In principle, it is possible, the wear-resistant ring segments 48 also directly into the two openings of the spectacle wear plate 30 to use and to solder there (cf. 4a to c). We then have a spectacle-shaped support structure 46 at which the wear-resistant ring segments 48 are directly attached. In the intermediate area between the openings 50 are additional gore-shaped wear plates 70 used, providing a smooth transition to the sealing surfaces 52 the wear rings 44 to ensure.

In summary, the following should be noted: The invention relates to a wear ring for two-cylinder thick matter pumps. The wear ring 44 has one with at least one circular opening in the outline 50 provided support structure 46 and several in the circumferential direction of the opening 50 forming an annular closed flat sealing surface 52 over butt joints 54 adjoining, with the support structure 46 material conclusively connected ring segments 48 made of wear-resistant material. According to the invention, the ring segments 48 at her the butt joints 54 limiting abutting edges in pairs complementary to each other, circumferentially positively interlocking edge portions 56 . 58 on. Another feature of the invention is that the ring segments 48 have an L-shaped cross-section. The wear rings of the invention 44 can equally in the spectacle plate 32 and as a cutting ring 32 a pipe switch 18 used for two-cylinder thick matter pumps.

Claims (19)

Wear ring with at least one circular opening ( 50 . 50 ' ) carrying structure ( 46 . 46 ' ) and with several in the circumferential direction of the opening ( 50 . 50 ' ) to form an annular closed flat sealing surface ( 52 . 52 ' ) over butt joints ( 54 . 54 ' ) adjoining, with the support structure cohesively connected ring segments ( 48 . 48 ' ) made of wear-resistant material, characterized in that the ring segments ( 48 . 48 ' ) at their butt joints ( 54 . 54 ' ) limiting abutting edges in pairs complementary to one another, in the circumferential direction positively interlocking edge parts ( 56 . 58 ) exhibit. Wear ring according to claim 1, characterized in that the two circumferentially opposite sides facing abutting edges of the individual ring segments ( 48 . 48 ' ) on one side a concave and on the other side a complementarily convex edge portion ( 56 . 58 ) exhibit. Wear ring according to claim 2, characterized in that on the concave and convex edge parts ( 56 . 58 ) reaching to the respective outer edge of the ring segments radial parts ( 60 ) connect. Wear ring according to one of claims 1 to 3, characterized in that the ring segments ( 48 . 48 ' ) to the support structure ( 46 . 46 ' ) are soldered. Wear ring according to one of claims 1 to 4, characterized in that the ring segments ( 48 . 48 ' ) consist of hard metal. wear ring according to claim 5, characterized in that the hard metal tungsten carbide. Wear ring according to one of claims 4 to 6, characterized in that between the support structure ( 46 . 46 ' ) and the ring segments ( 48 . 48 ' ) a copper or silver-containing solder material is arranged. Wear ring according to one of claims 1 to 7, characterized in that the support structure ( 46 . 46 ' ) consists of a ductile material, preferably made of steel. Wear ring according to one of claims 1 to 8, characterized in that the wear-resistant ring segments ( 48 . 48 ' ) in its entirety to the closed sealing surface ( 52 . 52 ' ) supplementary forehead leg ( 62 ) and a perpendicular thereto, to a closed inner boundary surface of the opening ( 50 . 50 ' ) in the supporting structure ( 46 . 46 ' ) complementary inner leg ( 64 ) exhibit. Wear ring according to claim 9, characterized in that the ring segments ( 48 . 48 ' ) have an L-shaped cross-section. Wear ring according to claim 9 or 10, as characterized in that the inner leg ( 64 ) in the circumferential direction of a circle segment with the radius of curvature of the opening ( 50 . 50 ' ) is curved. Wear ring according to one of claims 9 to 11, characterized in that the inner legs ( 64 ) of the ring segments ( 48 . 48 ' ) via axially extending butt joints ( 68 ) adjoin one another in the circumferential direction. Wear ring according to one of claims 1 to 12, characterized in that the butt joints ( 68 ) have a width of less than 0.3 mm. Wear ring according to one of claims 1 to 13, characterized in that the butt joints ( 68 ) are at least partially filled with solder material. Spectacle plate ( 30 ) for a pipe switch ( 20 ) of a two-cylinder slurry pump having two annular openings bearing receiving openings, wherein the ring inserts as wear rings ( 44 ) are formed according to one of claims 1 to 14. Cutting ring ( 34 ) for a pipe switch of a two-cylinder thick matter pump, which is used as wear ring ( 44 ' ) is designed according to one of claims 1 to 14. Swivel tube ( 32 ) for a pipe switch ( 20 ) of a two-cylinder slurry pump, which at its cylinder-side end an axially limited slidable cutting ring ( 34 ), characterized in that the cutting ring ( 34 ) as wear ring ( 44 ' ) is designed according to one of claims 1 to 14. Pipe switch ( 18 ) for two-cylinder high-solids pumps with a cylinder-side spectacle plate ( 30 ), the two with delivery cylinders ( 10 . 12 ) communicating, each having a ring insert limited receiving openings, and with a front of the spectacle plate ( 30 ) pivotable back and forth between the two ring inserts pivot tube ( 32 ), which on its spectacle-plate-side end a limited axially displaceable, with a front-side sealing surface ( 52 ' ) against sealing surfaces ( 52 ) of the ring inserts press-on cutting ring ( 32 ), characterized in that the ring inserts of the spectacle plate ( 30 ) and / or the cutting ring ( 32 ) of the pivot tube ( 32 ) as wear rings ( 44 . 44 ' ) are formed according to one of claims 1 to 14. Two-cylinder thick matter pump with a cylinder-side spectacle plate ( 30 ), the two with delivery cylinders ( 10 . 12 ) communicating, each having a ring insert limited receiving openings, and with a front of the spectacle plate ( 30 ) pivotable back and forth between the two ring inserts pivot tube ( 32 ), which on its spectacle-plate-side end a limited axially displaceable, with a front-side sealing surface ( 52 ' ) against sealing surfaces ( 52 ) of the ring inserts press-on cutting ring ( 34 ) carries, characterized in that the ring inserts of the spectacle plate ( 30 ) and / or the cutting ring ( 34 ) of the pivot tube ( 32 ) as wear rings ( 44 . 44 ) are formed according to one of claims 1 to 14.