COMMINUTION DEVICE

Abstract

The invention relates to a device (10; 50) for mechanically comminuting materials, including a vertically extending comminuting chamber (14) having an upwardly extending supply side (15) and a downwardly extending discharge side. The comminuting chamber is enclosed by an in circular cylindrical and/or conical downwardly expanded comminuting chamber wall (12), and in which at least one rotor (16, 18) rotating about a vertical rotor axis (R) is arranged, which is provided with striking tools (38) that extend radially into the comminuting chamber, at least during operation. The rotors(16, 18) are held in a stationary manner with respect to a support base (20) of the device, and the comminuting chamber wall is supported on the support base. According to the invention, the comminuting chamber wall is held in place by way of a lifting device in the direction of the rotor axis (R) in a height adjustable manner relative to the support base (20). The lifting device (36) has a working position, in which the lower edge of the comminuting chamber wall (12) is arranged close to the support base (20) or to a part connected thereto, and a maintenance position, in which the lower edge (32) of the comminuting chamber wall (12) is vertically raised above at least one of the striking tools (22, 24). The invention allows easy maintenance and an uncomplicated exchange of the striking tools of the comminuting device.

Claims

1. A comminution device for the mechanical crushing of materials, comprising: a rotor rotating around a vertical rotation axis (R) located in a crushing chamber, the crushing chamber includes a plurality of striking tools which at least during operation project radially into the crushing chamber, the crushing chamber is enclosed by a circular cylindrical and/or conically flared crushing chamber wall, and the crushing chamber on its an upper front end has an infeed side and on a bottom front end has an outlet side; whereby the at least one rotor is held at a bottom end in a fixed stationary position in relation to a supporting base and whereby the circular cylindrical and/or conically flared crushing chamber wall is supported by the supporting base, wherein the circular cylindrical and/or conically flared crushing chamber wall is held in a direction of a rotor axis (R) by a lifting device, that is height-adjustable relative to the supporting base, the lifting device has a working position wherein the a bottom edge of the circular cylindrical and/or conically flared crushing chamber wall is arranged in close proximity either to the supporting base or to a part connected to the supporting base and a maintenance position wherein the bottom edge of the circular cylindrical and/or conically flared crushing chamber wall is lifted vertically above at least one of the plurality of striking tools.

2. The comminution device according to claim 1, wherein the lifting device comprises at least one hydraulic cylinder.

3. The comminution device according to claim 1, wherein the lifting device has between two and four vertically arranged, parallel hydraulic cylinders.

4. The comminution device according to claim 3, wherein the between two and four vertically arranged, hydraulic cylinders are arranged equidistantly around an axis of the crushing device.

5. The comminution device according to claim 1, wherein the bottom side of the lifting device is connected to the supporting base.

6. The comminution device according to claim 1, wherein an electrical circuit breaker for a drive of the at least one rotor which is in contact with the supporting base or a partially connected to the supporting base, or in contact with the circular cylindrical and/or conically flared crushing chamber wall or partially connected to the circular cylindrical and/or conically flared crushing chamber wall.

7. The comminution device according to claim 1, further comprising a speed detection device for the at least one rotor which issues an enabling signal when all the at least one rotor is at a standstill, and a safety circuit which shuts off a power supply to a drive of the lifting device until the enabling signal is received.

8. The comminution device according to claim 1, wherein the circular cylindrical and/or conically flared crushing chamber wall is a cylinder wall with a circular or polygonal footprint.

9. The comminution device according to claim 1, wherein the crushing chamber is arranged vertically, with the infeed side on top and the outlet side on the bottom.

10. The comminution device according to claim 1, further comprising a loading cone arranged at the infeed side in connection with the crushing chamber, the loading cone is moved by the lifting device either separately and/or in conjunction with the circular cylindrical and/or conically flared crushing chamber wall.

11. the comminution device according to claim 10, further comprising a feed hopper attached to the infeed side of the crushing chamber wall, and that distance between the feed hopper and the loading cone can be adjusted by an adjusting device via activation of the lifting device.

12. The comminution device according to claim 1, further comprising an airflow device for conveying a mix of air and particles generated in the crushing chamber, the airflow device is arranged in connection with the crushing chamber and comprises at least one fan rotor arranged coaxially to the axis of the crushing chamber, the fan rotor is powered by a fan drive enabling the fan rotor to rotate independently of the at least one fan rotor, whereby the at least one fan rotor is located below the bottom edge of the circular cylindrical and/or conically flared crushing chamber wall when the circular cylindrical and/or conically flared crushing chamber wall is raised up into a maintenance position of the lifting device.

13. The comminution device according to claim 12, wherein the fan rotor is located at the supporting base at a height of an outlet.

14. The comminution device according to claim 12, wherein the bottom edge of the circular cylindrical and/or conically flared crushing chamber wall while in the maintenance position of the lifting device is lifted above a fastening point of the plurality of striking tools.

15. the device according to claim 1, wherein the at least one rotor are held at the supporting base.

16. The comminution device according to claim 1, wherein the bottom edge of the circular cylindrical and/or conically flared crushing chamber wall while in a working position of the lifting device, is in contact with the supporting base.

17. The comminution device according to claim 1, wherein the crushing chamber has at least two successive sections arranged in axial direction, whereby the at least one rotor is arranged coaxially to the crushing chamber, and whereby each rotor of the at least one rotor at least during operation comprises the plurality of striking tools which at least during operation are projecting at least mainly radially into the crushing chamber.

18. The comminution device according to claim 1, wherein the circular cylindrical and/or conically flared crushing chamber wall is held height-adjustably by the lifting device.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The invention is described in the following e.g. by the schematic drawings:

[0017] FIG. 1 shows a first embodiment of a crushing device with the lifting device in the working position;

[0018] FIG. 2 shows a perspective view of the first embodiment of the invention with the lifting device in the maintenance position, and

[0019] FIG. 3 shows a second embodiment of a crushing device where it is possible to also adjust the feed hopper's distance relative to the loading cone with the lifting device.

DETAILED DESCRIPTION OF THE INVENTION

[0020] The crushing device 10 contains a plain cylindrical crushing chamber wall 12 enveloping the crushing chamber 14, whose vertical central axis features two rotors 16, 18 (FIG. 2) which are preferably mounted on a supporting base 20 with its own drives (not shown). The rotors 16, 18 rotate around the vertical rotation axis R, which constitutes the axis of the crushing device. The crushing chamber 14 is arranged vertically and features an infeed side 15 on top and an outlet side facing the supporting base 20. The two rotors 16, 18, which are located in different axial segments of the crushing chamber 14, can therefore be actuated separately from each other, both in different directions of rotation and at different speeds. Each rotor 16, 18 features its own striking tools 22, 24, in the present case e.g. beater blades projecting radially into the crushing chamber 14. Instead of the metal beater blades shown herein, it is also possible to use chains or swivel-mounted beater rods for striking tools. The outlet side of the crushing chamber 14 features a fan rotor 26 which is arranged in the supporting base 20, below a feeder plate 30 fitted to the top of supporting base 20, for forwarding the particles atomized during crushing to a lateral outlet for further processing, in order to separate the recoverable minerals. The outlet 66 is preferably arranged at the same height as the fan rotor for effective removal of the crushed particles. The supporting base 20 is held on a supporting frame 28, and the feeder plate 30 for accommodating the bottom edge of the crushing chamber wall 12 during the working position portrayed in FIG. 1 forms the top of the supporting base 20. The supporting base 20, underneath feeder plate 30, features a housing 34 which accommodates the drives for the rotors 16, 18 and an exhaust duct. The corner areas of frame 28 of the supporting base 20 contain four hydraulic cylinders 36 which constitute the active parts of a lifting device. The hydraulic cylinders 36 are connected on their bottom sides to the frame 28 of the supporting base 20, and on their top sides to the horizontal support arms 40, which project radially from the crushing chamber wall 12. The four hydraulic cylinders 36, together with the support arms 40 and the electrical control not shown herein, constitute the lifting device of the crushing device 10.

[0021] During operation, the crushing chamber wall 12 is located in the working position portrayed in FIG. 1, relative to the supporting base 20, wherein the bottom edge 32 of the crushing chamber wall 12 rests on the feeder plate 30 of the supporting base 20, against which it preferably fits tightly to create a hermetic seal. This prevents any crushed material from escaping between the supporting base 20 and the crushing chamber wall 12 during operation of the crushing device. For maintenance of the elements in the crushing chamber 14, e.g. the rotors 16, 18 and the associated striking tools 22, 24, it is possible via the four hydraulic cylinders 36 to lift the crushing chamber wall 12 up into the maintenance position portrayed in FIG. 2, in which all striking tools 22, 24 of the two rotors 16, 18 are freely accessible as the bottom edge 32 of the crushing chamber wall 12 is in that position located vertically above the top-most striking tools 22. This position thereby allows excellent access both to the rotors 16, 18 and to the striking tools, thus permitting easy replacement of defective striking tools or easy maintenance of worn striking tools.

[0022] FIG. 3 shows a side view of a second embodiment of the invention which is largely identical to the embodiments shown in FIGS. 1 and 2, wherein identical or analog parts were labeled with the same reference signs. The crushing device 50 shown in FIG. 3 differs from the embodiment shown in FIGS. 1 and 2 in that the infeed side 52 of the crushing device 50 features a feed hopper 54 whose distance to a loading cone 58 can be variably adjusted by an adjusting device 56, and which loading cone 58 is either firmly attached to or attachable to the crushing chamber wall 12. The top of the adjusting device 56 is connected to horizontal mounting arms 60 which project radially from feed hopper 54. Activating the lifting device, i.e. the hydraulic cylinders 36, into the maintenance position portrayed will cause not only the crushing chamber 12 to be lifted, but also the feed hopper 54 and the loading cone 58. The size of the slot between the feed hopper and the loading cone 58 can be easily adjusted by releasing the adjusting device while the bottom edge 32 of the crushing chamber wall 30 is resting on the feeder plate 30 of the supporting base 20, in which case activating the lifting device 36 will lift only the feed hopper 54 towards the loading cone 58, which in turn is firmly attached to the crushing chamber wall 12.

[0023] After adjusting the infeed slot to the desired size by activating the lifting device, it is now time to set the adjusting device 56. At this point, the lifting device is lifted again to move the loading cone and the crushing chamber wall 12 together with the feed hopper 54, which makes it possible to raise the crushing chamber wall up into the maintenance position and to lower it down into the working position.

[0024] The embodiment 50 shown in FIG. 3, in addition to the two rotors 16, 18 and the associated striking tools 22, 24, also shows a fan rotor 62 with fan rotor blades 64 arranged in an area of the supporting base 20, which are an integral element of an air flow device which, during operation of the crushing device portrayed in FIG. 1, ensures a defined air flow to the crushing chamber and the removal notably of dust particles into an outlet 66 arranged next to it. It is possible to install a collecting container for the crushed goods or a processing plant such as e.g. a cyclone directly downstream of outlet 66.

LIST OF REFERENCE SIGNS

[0025] 10 Crushing device (first embodiment) [0026] 12 Crushing chamber wall [0027] 14 Crushing chamber [0028] 15 Infeed side [0029] 16 Top rotor [0030] 18 Bottom rotor [0031] 20 Supporting base [0032] 22 Top striking tools [0033] 24 Bottom striking tools [0034] 26 Fan rotor [0035] 28 Frame [0036] 30 Feeder plate [0037] 32 Bottom edge of the crushing chamber wall [0038] 34 Housing [0039] 36 Hydraulic cylinder [0040] 40 Support arms [0041] 50 Crushing device (second embodiment) [0042] 52 Infeed side [0043] 54 Feed hopper [0044] 56 Adjusting device [0045] 58 Loading cone [0046] 60 Mounting arms [0047] 62 Fan rotor [0048] 64 Fan rotor blades [0049] 66 Outlet