Material feed receptacle for a thick matter pump

ES 2 331 702 T3

DESCRIPTION

Material supply container for a thick material pump.

The invention relates to a material supply container for a thick material pump according to the generic term of claim 1.

In EP 1 076 596 B1 a material supply container for thick material pumps is disclosed which has an upwardly open container bottom and a container overlay which is detachably attached thereto by a connection flanged. The upper perimeter edge of the container overlay limits the material supply opening. A stripper mechanism is housed in the bottom of the container, the bearings of which are located in an open-edge recess of the bottom of the container, so that the stripper mechanism is easily replaceable after removing the container insert. The container overlay forms a loading hopper for thick material, such as concrete. Loading of the concrete generally takes place because a mobile concrete mixer approaches the material supply container and loads the concrete through a chute into the material supply container. To prevent the container insert from being damaged due to a collision with the approaching mobile concrete mixer, the container insert must be made of sturdy sheet metal. This implies a high weight, so that the container overlay cannot be simply removed manually. Also from WO O3 / 042535 A a material supply container of the type mentioned at the beginning is known.

Material supply containers according to EP 1 076 596 B1 have intermediate rings as wear parts at the transport cylinder openings, which protect the inner surface, which corresponds to the front wall of the container, of the transport cylinder opening against wear from flowing concrete. These intermediate rings need to be replaced regularly due to wear. Since the intermediate rings are inserted into the transport cylinder opening on the transport cylinder side, the transport cylinder must first be removed from the container front wall for mounting and dismounting. This is very complicated.

The invention has the object of improving a material supply container of the type mentioned at the beginning in such a way that it is easier to maintain and that wear parts can be replaced more easily.

The object is achieved by means of a material supply container with the attributes of claim 1. Advantageous configurations of the invention are the subject of the dependent claims.

The invention is based on the concept of making the interior of the material supply container more easily accessible to maintenance personnel by presenting a container insert, which can be easily disassembled and removed. However, the container overlay does not extend to the rear wall facing the approaching mobile concrete mixer. Thus, the circumferential edge delimiting the material supply opening has, on the rear wall side, an edge section belonging to the lower container part. The container overlay is thus protected from damage by the mobile concrete mixer. For this reason it does not need to be so robustly shaped and can have a relatively low weight.

Advantageously, the first edge section found on the container overlay is aligned with the second edge section belonging to the lower container part. The material supply opening can then be covered in a simple manner by means of a hinged hinged lid in the upper front wall section on the container insert. The hinged lid is preferably made of plastic, so that concrete residues adhere worse to the lid than to a metal lid. This makes the hinged lid easier to clean.

The container bottom conveniently has a rear wall, a bottom, a front wall bottom section, and side wall bottom sections that slope downward toward the front wall bottom section. The upper front wall section and the upper side wall sections of the container insert favorably carry at their lower edge a first flange which is detachably connected with a second complementary flange on the lower front wall section and the lower sections. side wall of the bottom of the container. Between the first flange and the second flange a sealing means is conveniently arranged. This results in a good sealing effect in the parting line between the container bottom and the container overlay.

The lower front wall section, the rear wall, the lower side wall sections of the container bottom part and / or the bottom are suitably made of sheet metal, preferably of robust sheet steel. An advantageous alternative is that the lower front wall section, the rear wall, the lower side wall sections and / or the bottom are at least partially of a lightweight construction material. The lightweight construction material may have a carbon fiber reinforced plastic and / or a glass fiber reinforced plastic. It is also possible that the lightweight construction material is silicon carbide or a metallic sponge, preferably with titanium components. The lightweight construction material suitably carries an abrasion resistant and / or hard coating, particularly from the chromium, silicon carbide or ceramic group of materials. The transport cylinder openings are preferably arranged in the lower front wall section. At the bottom of

The container ES 2 331 702 T3 is furthermore preferably housed a support device for a tubular branch. In addition, the container bottom conveniently features pivot bearings for a stirring mechanism. In this way, the partly considerable forces transmitted by the transport cylinders, the tubular branch and the stirrer mechanism are absorbed in the pumping operation through the bottom of the container. The container insert, which only has to absorb the forces resulting from the loading of thick material, can thus be made considerably less robust and therefore lighter.

The upper front wall section and the upper side wall sections of the container insert may also be made of sheet metal, preferably sheet steel. In this case, smaller wall thicknesses are possible than in the sheet of the container bottom part. However, it is preferred that the upper front wall section and the upper side wall sections are made of plastic. Advantageously, the container insert is integrally constructed as an injection molded part. Conveniently, to this injection molded part a support flange is formed, which is oriented towards the inside of the container, for a lattice grate. Likewise, the upper front wall section and / or the upper side wall sections can be formed with reinforcing slats which provide a higher stability to the container insert.

In an alternative or complementary way, the container insert may in this case be in particular the upper front wall section and / or the upper side wall sections, at least partially of a lightweight construction material. The lightweight construction material used for this may conveniently comprise a carbon fiber reinforced plastic and / or a glass fiber reinforced plastic. It is also possible that the lightweight construction material is silicon carbide or a metallic sponge preferably having titanium components. Conveniently, the lightweight construction material carries an abrasion resistant and / or hard coating, particularly from the group of materials chromium, silicon carbide or ceramic.

As an alternative or in addition to the abutment rim on the container overlay, the container bottom piece may have abutment elements for a trellis grill projecting above the lower front wall section. This is especially advantageous when the grid is very heavy and its weight cannot be supported by the container insert. The second edge section, on the rear wall side, of the material supply opening is conveniently formed by means of a rubber skirt attached to the bottom of the container. It is attached to the rear wall and to the side wall sections protruding from the rear wall.

It is preferred that the container bottom and the container insert are attached to each other by means of screws. This results in a simple, robust and yet easily detachable joint.

The favorable manufacturing model according to claim 29 is based on the concept that a hinged lid made of plastic or a lightweight construction material, which covers the material supply opening, which is hinged on a container wall, is easier clean than a conventional sheet metal hinged lid. A thick material, particularly concrete, adheres to plastic considerably worse than to sheet metal. The hinged lid is advantageously formed as a hollow plastic body with a first plastic cover facing the material supply opening and a second plastic cover, which is conveniently connected to the one in one piece, which forms an upper cover face. A hollow plastic body is relatively robust with low weight. This is particularly favorable when the hinged lid is hinged on the container insert and must be removed together with the container insert for maintenance work inside the container.

To facilitate cleaning, the first plastic cover may have a smooth surface facing the material supply opening. On the other hand, it is preferred that the second plastic cover has reinforcing grooves. This gives the hinged lid greater resistance. The hinged lid is advantageously made in one piece by means of a spin casting process.

If the hinged lid is made at least partially of a lightweight construction material, this may advantageously comprise a carbon fiber reinforced plastic and / or a glass fiber reinforced plastic. The lightweight construction material can also be silicon carbide or a metallic sponge that preferably has titanium components. Conveniently, the lightweight construction material carries an abrasion resistant and / or hard coating, particularly from the chrome, silicon carbide or ceramic group of materials.

The hinged lid conveniently has a handle which is preferably made in one piece. Furthermore, it advantageously has hooks, on which closure elements fixed to the wall of the container can be hooked. The hooks are also attached by forming preferably in one piece to the hinged lid. The hinged lid is connected to the front container wall preferably by means of at least one hinge and at least one gas spring. The gas spring makes it easy to open the lid. Close to its side connected to the front wall of the container, the hinged lid conveniently has fixing means for a rubber skirt on the first plastic cover. This hangs down from the hinged lid into the material supply opening and prevents thick material from flowing into the interspace between the hinged lid and the container front wall.

ES 2 331 702 T3

The favorable development according to claim 42 is based on the concept that it requires less effort to mount and dismount the intermediate rings through the inner wall of the container than through the outer wall of the container. This prevents the transport cylinders from having to be uncoupled from the material supply container when replacing the intermediate rings. An intermediate ring is placed through the interior of the container into the transport cylinder opening by moving the cam, along its outer lateral surface, to the bayonet opening and then rotating the intermediate ring about its longitudinal axis so that the cam is inserted into the internal slot. The mounting of an intermediate ring through the interior of the container is particularly favorable when the material supply container is formed in two pieces, as described above. The interior of the container is easily accessible by removing the relatively lightweight container overlay.

The internal groove may be circumferentially shaped in the transport cylinder opening. Preferably, the intermediate ring carries on its external lateral surface at least two, preferably three, cams arranged at equal angular distance from each other. The transport cylinder opening then has a number of bayonet openings, which is analogous to the number of cams, which are also arranged at equal angular distance from each other. Since the intermediate ring is fixed in the axial direction by means of the engagement of the cams in the internal groove, this fixation is all the more stable the more cams are arranged on the lateral surface.

Conveniently on the outer container side of the container front wall a connecting plate is arranged for connecting transport cylinders, through which the transport cylinder openings extend. Furthermore, a spectacle plate with two spectacle plate openings is conveniently detachably attached to the inner surface of the container front wall. The spectacle plate openings communicate with the transport cylinder openings and their boundary surfaces are aligned with the boundary surfaces of the passage channels in the intermediate rings. The spectacle plate therefore overlaps a part of the transport cylinder openings and further fixes the intermediate rings in the direction towards the interior of the container. For the replacement of the intermediate rings the spectacle plate is removed.

The intermediate ring and / or the spectacle plate are suitably made at least in part of a material of lightweight wear resistant construction. The lightweight construction material may have a carbon fiber reinforced plastic and / or a glass fiber reinforced plastic. It is also possible that the lightweight construction material is a silicon carbide or a metallic sponge, the latter preferably having titanium components.

Conveniently, the boundary surfaces of the passage channels and / or the spectacle plate openings are coated with a wear layer. It is preferably made of a hard metal or of a material from the group of materials chromium, silicon carbide or ceramic. By means of the wear layer, the spectacle plate and the intermediate rings, which are each wearing parts, are protected against wear and therefore need to be replaced less frequently.

It may be provided that the diameter of the passage channel narrows towards the interior of the container or towards the transport cylinder. In this way, transport cylinders of different internal diameters can be connected by placing different internal rings in the transport cylinder openings. The passage channels are suitably dimensioned such that their boundary surfaces are aligned with the internal surfaces of the transport cylinders.

Conveniently, the intermediate ring has on its lateral surface at least one circumferential groove, which is axially offset with respect to the cam, with a sealing ring for bearing on the front wall of the container and / or the connecting plate. It preferably has two circumferential grooves, one of which houses a sealing ring supported on the front wall of the container and the other, one supported on the connection plate. The intermediate ring can have a further circumferential groove on a front face facing the spectacle plate with a sealing ring resting on the spectacle plate. By means of these measures, a good seal of the material supply container is obtained in the area of ​​the transport cylinder openings.

To facilitate assembly and disassembly, the intermediate ring may have recesses on a front surface facing the spectacle plate for inserting retaining pins. Furthermore, between the intermediate ring and the container front wall, a circumferential cavity can be arranged which can be filled with lubricant through a supply opening and which is enlarged by removing the intermediate ring from the opening of the transport cylinder. To remove the intermediate ring, a mounting ring is then used with retaining pins that engage in the recesses of the intermediate ring. With the help of the mounting ring, the intermediate ring is rotated to open the bayonet lock. A lubricant, such as grease, is then pressed into the cavity so that the intermediate ring is pressed outward, the cams moving through the bayonet openings.

In the following, the invention is explained in detail on the basis of manufacturing examples schematically represented in the drawing. It is shown in:

Figure 1, a side view of a mobile concrete pump with a rear material supply container,

ES 2 331 702 T3 figure 2, a perspective view of the material supply container with a raised container overlay, figure 3, a perspective view of the container overlay without hinged lid, figure 4, a section through the container wall in the area of ​​a transport cylinder opening, figure 5, a perspective view of an intermediate ring removed from the transport cylinder opening, figure 6a and 6b, perspective views of a hinged cover, according to a second manufacturing example, diagonally up and down diagonally, figure 7, a section through the hinged cover according to figures 6a and 6b along the line AA, figure 8a and 8b, detailed representations of the hinged cover according to Figures 6a and 6b in section.

The automatic concrete pump shown in the running state in Figure 1 has a chassis 10, a front driver's cab 12, a concrete placing boom 16 housed in a pivot bearing bracket 14 of chassis 10 and a pump thick materials bicylindrical 18 arranged in the chassis 10. The material supply container 20 arranged at the rear of the chassis 10 has on its front wall 22 transport cylinder openings 24, through which the two transport cylinders 26 of the thick material pump 18 are connected. Rear 28 opposite the front wall 22, of the material supply container 20 is a pressure nozzle 30, to which a transport pipe 32 is connected. Inside the container there is a tubular branch 34, which here is shaped as a tube S, which with its one end is connected to the pressure nozzle 30 and whose other end can be rotated alternately, around the axis of a shaft of rotation, not shown, with hydraulic means in front of the two transport cylinder openings 24.

The material supply container 20 (Figure 2) is subdivided into a container bottom part 38 and a container overlay 40. The front wall 22, as well as the side walls 42 that connect the front wall 22 with the rear wall 28 , are in each case divided into two, into an upper and a lower section. In this case, the container overlay 40 has an upper front wall section 44, as well as upper side wall sections 46, extending away from it, with free ends 48 (FIG. 3). The upper front wall section 44 and the upper side wall sections 46 carry at their lower edge a first flange 50 for fixing the container insert 40 to the container bottom part 38. Here in the example of manufacture shown, the container insert 40 is manufactured in one piece as an injection molded plastic part. For the reinforcement, reinforcement strips 52 are attached by conforming to it.

The container bottom part 38 has, apart from a bottom 54 and the rear wall 28, a lower front wall section 56, as well as lower side wall sections 58. The lower side wall sections 58 slope downward towards the lower front wall section 56 and carry a second flange 60 which is complementary to the first flange 50. The two flanges 50, 60 can be easily joined by screws 62. A rubber gasket may be disposed between these so that the container bottom 38 and the container overlay 40 can be easily joined to form the material supply container.

20.

The material supply container 20 has an upward-facing material supply opening 64 which is delimited by a perimeter edge 66, 68.

The perimeter edge is subdivided into two edge sections 66, 68. The first edge section 66 is formed by the upper edge of the upper front wall section 44 and the upper side wall sections 46. To that is attached the second edge section 68 which is formed by the upper edge of a rubber skirt 70. This is attached to the bottom of the container 38 and protrudes over the rear wall 28 and parts, extending away from the rear wall 28, of the lower side wall sections 58. The two edge sections 66, 68 are aligned with one another.

At the bottom of the container 38 there are provided in the side walls 42 bearing openings 72 which serve to accommodate bearings of a stripper mechanism. In the rear wall 28 a rear wall opening 73 is arranged, by means of which the tubular branch 34 can be connected to the pressure socket 30. In the lower front wall section 56 are the transport cylinder openings 24 for connection transport cylinders 26. Therefore, all the moving components in the pumping operation are housed in the lower part of the container 38 which absorbs the forces emanating from those components. Correspondingly, the container bottom 38 is made of sturdy, thick-walled sheet steel. Only forces caused by the concrete loaded into the material supply opening 64 act on the container insert 40. Considerably less demands must therefore be made on its stability.

The container bottom portion 38 has tube-shaped support members 74 for a trellis grill that protrude above the lower front wall section 56. The trellis grill can be placed alternately

ES 2 331 702 T3 tively also on a bearing flange, which is oriented towards the inside of the container, which is attached by shape to the container insert 40. The material supply container 20 is fixed by means of suspension devices 76 to the chassis 10.

On the outer side of the container a connecting plate 80 for connecting the transport cylinders 26 is placed on the front wall 22. On the inner side of the front wall 22 a spectacle plate 82 is detachably attached (FIG. 4), whose spectacle plate openings 84 communicate with the transport cylinder openings 24. The spectacle plate 82 projects above the transport cylinder openings 24 and thus forms an abutment for an intermediate ring 86 in the direction of the container. The intermediate ring 86 extends in the axial direction over the transport cylinder opening. conveyor 24 extending through front wall 22 and connecting plate 80. Its inner surface delimits a passage channel 88 for thick material. The outer side surface 90 of the intermediate ring 86 carries three cams 92 arranged at an angular distance of 120 °. These can be inserted via bayonet openings 95 into an internal groove 94 which is circumferential in the transport cylinder opening 24 and thus forms a bayonet lock, by means of which the intermediate ring 86 can be fixed, in an axial direction towards the transport cylinder 26, into the transport cylinder opening 24. The boundary surface of the passage channel 88 is aligned with the boundary surface of the spectacle plate openings 84, as well as with the internal surfaces of the transport cylinders 26. Thus they are not located in the transport cylinder opening 24 free edges that would be subject to high wear by thick flowing material. For further reduction in wear, both the spectacle plate 82 and the boundary surface of the passage channel 88 have a wear layer 89 of hard metal. For sealing the opening of transport cylinders 24, the intermediate ring 86 has on its lateral surface 90 two circumferential grooves 96, which are axially displaced with respect to the cams 92, in which the sealing rings 98 are inserted for bearing. on the front wall 22 and the connection plate 80. Another circumferential groove 96 is located on the front face of the intermediate ring 86 facing the spectacle plate 82. The sealing ring 98 contained therein abuts against the spectacle plate 82.

To replace the intermediate ring 86, the spectacle plate 82 is first unscrewed. The intermediate ring 86 is then rotated about its longitudinal axis until the cams 92 can be removed from the bayonet openings 95. For this purpose, the intermediate ring has on its front face notches 100 for inserting fastening pins. Between the intermediate ring 86 and the front wall 22 there is further disposed a circumferential cavity 102 which can be filled with grease through a supply opening 104. The cavity 102 is enlarged by removing the intermediate ring 86 from the transport cylinder opening 24. towards the inside of the container. In this way, the introduction of grease under pressure through the supply opening 104 facilitates the removal of the intermediate ring 86. The grease also acts as a lubricant that facilitates the rotation of the intermediate ring 86. As a general rule, the wear parts, spectacle plate 82 and intermediate ring 86 are replaced together.

In the material supply container 20 according to FIG. 2, a hinged lid 108 is hinged on the upper front wall section 44 by hinges 106, which covers the material supply opening 64. Instead of that metal hinged lid 108 According to the second manufacturing example, a plastic hinged lid 110, as shown in FIGS. 6a and 6b, can be used. The hinged cover 110 is designed as a hollow plastic body, as can be seen from the sectional representation in FIG. 7. It has a first plastic cover 112, which faces the material supply opening 64, and a second cover of plastic 114 that is joined thereto in one piece and forms a lid surface. The hinged lid 110 is manufactured in one piece by means of a spin casting process. The first plastic cover 112 has a smooth surface, facing the material supply opening 64, from which soils with thick material, particularly concrete, can be easily removed. The second plastic layer 114 has reinforcing grooves 116 which increase its strength. In addition, to the side of the hinged lid 110 there are hooks 118 attached by forming (figure 8a), in which closure elements can be hooked to firmly close the material supply opening 64, which are attached to the material supply container 20, for the formation of an elbow seal. To the side of the hinged lid 110 there is also a handle 120 that is attached by forming (figure 8b). Gas springs may be arranged between the hinged lid 110 and the material supply container 20 which facilitate an opening of the hinged lid 110. In the first plastic cover 112, the hinged lid 110 has holes 122, 124. A first group of holes 122 serves for the placement of handles and locking elements that hold the hinged lid 110 in an open position. A second group of holes 124 serves for the placement of a rubber skirt that covers the intermediate space between the hinged lid 110 and the material supply container 20 and that prevents thick material from flowing through that intermediate.

In summary, the following should be noted:

The invention relates to a material supply container 20 for a thick material pump 18 with a container bottom 38 and a container overlay 40 removably attached to the container bottom 38, with a divided front wall 22 in two, a rear wall 28 and two side walls 42 which are each divided in two, with a material supply opening 64 facing upwards and delimited by a perimeter edge 66, 68, with two transport cylinder openings 24 arranged in the front wall 22 and with a tubular branch 34, which is arranged inside the container, which on the inlet side can be rotated alternately in front of the transport cylinder openings 24 and which of the The outlet side opens into a pressure tube 30. According to the invention, provision is made for the container insert 40 to have a wall section

ES 2 331 702 T3 upper front 44, as well as upper side wall sections 46, extending away from it, with free ends 48, and the perimeter edge 66, 68 having a first edge section 66, which forms an edge top of the container overlay 40, and a second edge section 68, which is at the bottom of the container 38, which is on the rear wall side, located next to the first edge section 66.