DEVICE FOR TREATING MATERIAL, COMPRISING A CONTAINER

Abstract

A device for treating material in a container which is equipped with a stirrer that can be rotated about a central axis has a first deflecting device which is arranged in the container above the stirrer in order to deflect a material flow transported by the stirrer to the container center. The stirrer has a coaxial axle element, the diameter of which in the region of the stirrer is at least a quarter of the diameter of the stirrer. The container has a base below the stirrer, and the distance between the base and the deflecting device is maximally half the maximum diameter of the container between the base and the deflecting device. The base can also be designed as a perforated sheet.

Claims

1: A device for treating material with a container (2), in which is arranged a stirrer (6) that can be rotated around a central axis (5), and with a first deflecting device (7), which is arranged in the container (2) above the stirrer (6), so as to deflect a material flow conveyed by the stirrer (6) to the middle of the container, wherein the stirrer (6) has a coaxial axle body (10), the diameter (12) of which in the area of the stirrer (6) measures at least one fourth the diameter (13) of the stirrer (6).

2: The device according to claim 1, wherein the container (2) underneath the stirrer (6) has a base (3), and wherein a distance (16) between the base (3) and deflecting device (7) measures at most half the maximum diameter (17) of the container (2) between the base (3) and deflecting device (7).

3: The device according to claim 1, wherein the diameter (22) of the stirrer (21) measures at least 70%, preferably at least 80%, of the maximum diameter (23) of the container (24) between the base (26) and deflecting device (25).

4: The device according to claim 1, wherein the stirrer (6) has one or several arms (11), which extend radially outward from the central axle body (10).

5: The device according to claim 1, wherein the first deflecting device (7) has a circular blank (8) with a central, free passage (9) that is arranged in the container (2).

6: The device according to claim 1, wherein the first deflecting device (25) comprises a constriction (27) on the container (24).

7: The device according to claim 1, wherein the first deflecting device (7, 43) has a central, free passage (9, 53) with a diameter (55) of at least 0.8 m.

8: The device according to claim 1, wherein the first deflecting device is comprised of a material flow (88) conveyed downwardly toward the middle of the container by an additional stirrer (87) arranged above the first stirrer (84).

9: The device according to claim 1, wherein the container (45) on the central axle (56) has no conveyor that conveys to the stirrer (57), at least above the deflecting device (43).

10: The device according to claim 1, wherein the container (45) has a feed chamber (44) above the deflecting device (43).

11: The device according to claim 1, wherein it has a tangential supply line (52) to the container (45).

12: The device according to claim 1, wherein it has a second concentric deflecting device (29, 61) above the stirrer (21, 62).

13: The device according to claim 12, wherein the second deflecting device (29) has a tapered section (30), which is concentrically arranged above the stirrer (21).

14: The device according to claim 12, wherein the second deflecting device (61) has a truncated cone (63) that tapers toward the stirrer (62), so as to divert the material flow deflected radially inwardly to the central axle (66) toward the stirrer (62).

15: The device according to claim 12, wherein the second deflecting device (29) has a cone (30) or truncated cone that expands toward the stirrer (21), so as to divert the material flow radially outward.

16: The device according to claim 1, wherein the container (45) has a circumferential wall (46), whose radially outermost area has at least one continuous kink (46, 49) with an obtuse angle (48, 50) open toward the container inner side.

17: A method for operating a device according to claim 1, wherein a fill level above the first deflecting device (43) is set in the container (45).

18: The method according to claim 17, wherein the speed of the stirrer (57) is lowered while filling as the load rises.

Description

[0033] Advantageous embodiment variants of devices according to the invention are shown in the drawing, and will be explained in more detail below.

[0034] Shown on:

[0035] FIG. 1 is a simple embodiment of a device according to the invention with circular blank,

[0036] FIG. 2 is an embodiment of the device according to the invention with a truncated cone that expands toward the stirrer,

[0037] FIG. 3 is a device with a feed chamber,

[0038] FIG. 4 is a device with a tangential inflow and a truncated cone that tapers toward the stirrer, and

[0039] FIG. 5 is a device with two stirrers located one over the other.

[0040] The device 1 shown on FIG. 1 has a container 2, in which a screen plate 4 is arranged as the base 3. A stirrer is provided concentrically to the cylindrical container 2 on a central axle 5 directly above the base 3. Provided above the stirrer 6 as a first deflecting device 7 is a horizontally arranged circular blank 8 with a circular, central free passage 9.

[0041] The stirrer 6 has a coaxial axle body 10, from which six bent arms 11 radially extend.

[0042] The axle body 10 has a diameter 12 in the area of the stirrer 6 whose length measures at least one fourth of the diameter 13 of the stirrer 6.

[0043] The stirrer 6 is driven by a gearbox 14 and a motor 5. As a consequence, the arms 11 turn around the central axle 5, so as to circulate material (not shown) between the circular blank 8 and base 3.

[0044] To ensure that the material strikes the lower side of the circular blank 8 and is there diverted, the distance 16 between the base 3 and deflecting device 7 measures at most half the diameter 17. The diameter 17 is the maximum diameter of the container 2 between the base 3 and deflecting device 7.

[0045] When using the device, material with water above the circular blank 8 is put into container 2. The material falls through the free passage 9 in the area below the circular blank 8 and onto the stirrer 6. This stirrer 6 turns the material in the container 2 between the base 3 and deflecting device 7, wherein the material is upwardly driven by the shape of the container 2 and stirrer 6 in the radially outer area, and flows toward the top until it strikes the lower side of the circular plank 8 and gets to the middle 18 of the container. The material there falls downwardly to the stirrer 6, and is conveyed radially outwardly again by the stirrer 6.

[0046] In particular given coarse or pasty material, this gives rise to high shearing forces between the material particles and a thorough mixing of the material.

[0047] The material has the lowest circumferential speed in the center of the stirrer 6, which encourages the formation of clumps here. For this reason, the stirrer has the axial axle body 10, which here prevents material from accumulating, and deflects the material radially outward And toward the stirrer arms 11.

[0048] FIG. 1 shows an especially small stirrer. A stirrer is advantageously of the kind depicted in device 20. The stirrer 21 here has a diameter 22 almost as large as the maximum diameter 23 of the container 24 between the deflecting device 25 and the base 26 of the container 24.

[0049] In this exemplary embodiment, the deflecting device 25 is a container wall that faces radially inward from the maximum container diameter 21, and forms a constriction 27 on the container.

[0050] Above the coaxial axle body 28, this container has a tapered section 30 as a second deflecting device 29, which is arranged concentrically above the stirrer 21. This tapered section 30 is shaped like a cone or truncated cone, whose shell surface expands toward the stirrer.

[0051] A screen plate 31 is located below the stirrer 21, and under that is the motor 32 as the drive for the stirrer 21.

[0052] Material that gets tangentially (not shown) or from above into the container 24 is thus deflected radially outward to the stirrer 21 by the conical jacket surface of the tapered section 30, and wanders upwardly along the inner wall of the container 24 in the radially outward area, so as to be deflected radially inwardly again by the deflecting device 25.

[0053] The device 40 shown on FIG. 3 has a funnel 41, which transitions into a cylindrical collar area 42 and then into a feed chamber 44 bordered by a circular blank 43. The container 45 expands below the circular blank 43. The circumferential wall there has a first continuous kink 46 in the radially outermost area of the container 45, which transitions into a short cylindrical jacket area 47, and in so doing forms an obtuse angle 48 open toward the interior side of the container. This is followed toward the bottom by another kink 49, which once again has an obtuse angle 50 open toward the container interior side 51.

[0054] As a consequence, the material gets into the feed chamber 44 either via the funnel 41 or via a tangential supply line 52, and from there to the tapered section 54 through the free passage 53. In the exemplary embodiment, the free passage has a diameter 55 of about one meter.

[0055] The container 45 has no conveyor that leads to the stirrer 57 both on the central axle 56 and above and below the deflecting device 43.

[0056] FIG. 4 also shows a device 60 with a second concentric deflecting device 61 above the stirrer 62. By contrast, this second deflecting device 61 has a truncated cone 63 that tapers toward the stirrer 62. This truncated cone 63 takes the material conveyed through the tangential inflow 64 into the container 65, which is stirred by the stirrer 62 and flows upwardly in radially outer areas of the container 65, and guides it back down to the stirrer 62. This is accomplished by means of a conical circumferential surface 67 that is concentric to the central axle of the container 65.

[0057] The gearbox 69 of the motor 68 drives the stirrer 62, which stirs the material in the container 65, during which the material is first made to flow upwardly by the stirrer shape, centrifugal forces and shape of the inner wall 70 of the container 65. The material then gets to an inner container wall 71 above the stirrer 62, which as the first deflecting device deflects the material toward the central axle 66. The material is then deflected back down to the stirrer 62 via the conical jacket surface 67 of the truncated cone 63. The material thus circles around a central annular axis of a torus and stirrer and container shape, and the deflecting devices are designed so as to, if at all possible, produce no areas with an especially low speed. This leads to an intensive mixing, and prevents clump formation.

[0058] In the device 80 shown on FIG. 5, the first deflecting device need not necessarily be a container wall or container insert, but rather can also be provided by a second material flow. This device 80 has a container 81, in which a first motor 82 and a first gearbox 83 drive a first stirrer 84 in the container 81. Located above that is the second motor 85, which drives a stirrer 87 in the container 81 via a second gearbox 86. The stirrer 87 thus produces a downward material flow, while the stirrer 84 produces an upward material flow. At the location where these material flows meet, the lower material flow forms a deflecting device for the upper material flow, and the upper material flow forms a deflecting device for the lower material flow. The material flow 88 generated by the second stirrer 87 thus forms the first deflecting device for the material flow 89 produced by the stirrer 84 toward the container middle 90.

[0059] Arranged in the middle of the container as a coaxial axle body is a double tapered section 91, which has a lower conical jacket surface 92 that tapers toward the stirrer, so as to deflect the material flow 89 toward the stirrer 84.

[0060] The upper side of the double tapered section 91 has a conical jacket surface 93 that tapers toward the stirrer 87, which deflects the material flow 88 toward the stirrer 87.

[0061] As evident from the device shown on FIG. 3, it is advantageous that the fill level (not depicted) in the container be set above the first deflecting device 43. As a result, the feed chamber 44 along with the chamber above that up to the funnel 41 can be used as a storage space for material, and a liquid material or a filling with liquid or water produces a hydrostatic pressure that acts on the material in the area of the stirrer 57.

[0062] In order to achieve the desired material flow in the container 45, it is proposed that the speed of the stirrer be lowered while filling the container 45 with material as the load increases. This makes it possible to achieve an especially intensive circulation of the material at a low power consumption.