MX2008005065A - Dosing device - Google Patents

Abstract

In order to increase the fitness for use of a dosing device (1) for continuously and gravimetrically dosing pourable material, particularly rough fuels, a flow of material is conveyed from a charging opening (5) to an emptying opening (7) in a housing (4) with a rotor (3), which is driven about a vertical rotation axis, while determining the instantaneous load over a measuring section, and with a force measuring device (10), which detects the instantaneous load of the flow of material guided via the rotor (3) and which is connected to the housing (4) mounted on a pivot axis (8). According to the invention, a vibrating funnel (50) with a vibration generator (52) is provided above the charging opening (5) of the rotor (3).

Description

DOSAGE DEVICE Description of the Invention The invention relates to a dosing device for the continuous gravimetric supply of a material capable of being poured, comprising the features of prior characterization of claim 1. This dosing device is known from WO 98 / 50764 of the applicant. In this document, a dosing rotor is provided, specifically, for the heating of a cylindrical rotary kiln in a cement calcining process, which is subdivided by drag rims extending, in essence, in the radial direction. To guarantee discharge into the emptying orifice, the latter is provided with a compressed air nozzle. At the loading end, a circulation agitator could be provided in order to homogenize the fuels supplied. 'While this device is the most suitable for bulk material dosing, some problems could be generated with respect to coarse or coarse fuels such as coal or broken lignite being fed, although it is also unloaded and loaded on conveyors. Subsequent, because the bulk material could get stuck and configure rock formations and blocks. The agitators used up to now can handle these disturbances in the supply of the material with great problems and also present a high wear with coarse materials having sharp edges. These transport disturbances can also cause significant inaccuracies in the result of the measurement and therefore in the meter.

SUMMARY OF THE INVENTION Therefore, an object of the invention is to improve such a dosing device with respect to its wear, as well as to allow it to be used with a coarse or coarse bulk material. This objective is achieved through a dosing device according to the features of claim 1. A safe and wear-resistant feed is achieved by placing a vibration funnel having a vibration generator above the loading orifice. . In addition, the vibration generator can be located, so that the latter oscillates predominantly, in a horizontal direction, so that the measurement result of the load cell measuring in a vertical direction is not affected. Therefore, vibrations can also be introduced into the housing and the dosing rotor that rotates therein through a correspondingly designed compensator, whereby, the emptying is favored by the high frequency vibrations avoiding crowding or agglutinations. In addition, the emptying of the material flow can be facilitated, substantially, by a blowing nozzle that exhales hot air or inert gas directly onto the material flow conveyed from the bulk material. The jet of air blown from one or more nozzles that are preferably formed as flat nozzles divides or separates the flow of material passing through the dosing device in its discharge station, thereby achieving separation or disintegration of bulk material that could be attached together. In this way, a reliable supply is achieved and also the complete discharge of the transported flow of material from the dosing device and by disintegration, the flow of material is prepared for further transport. In an advantageous embodiment, the radial outer ends of the drive flanges are connected with a peripheral ring that could be higher than the drive flanges in order to thereby provide an outer limit against any escape of the bulk material to the outside and a spatial limitation of the airflow of the blowing nozzle. In this construction, the central rotor hub is also formed higher for the purpose of locating the vortex area between the peripheral ring and the rotor hub, so that the shaft tip bushing of the bulk material limited to the outside and inwardly it will be carried accurately out of the rotating flow.

BRIEF DESCRIPTION OF THE FIGURES Additional advantageous developments are the subject matter of the claims. Below, an exemplary embodiment will be explained in greater detail and will be described based on the figures, wherein: Figure 1 is a side front view of a dosing device; Figure 2 is a side view rotated through 90 ° of the dosing device; Figure 3 is an enlarged side view in the housing; and Figure 4 is a sectional view corresponding to Figure 3.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Figures 1 and 2 show a dosing device 1 essentially comprising a metering rotor 3 (see Figure 4) rotating in a housing 4 which is completely closed except for an opening or loading orifice 5 and a discharge orifice 7. In this case, the loading orifice 5 and the emptying orifice 7 are placed together to form the longest measuring section possible. The housing 4 is mounted in an oscillating manner in a structure 2, as specified below. The opening or loading hole 5 is provided with a register 6 which is supplied with the bulk material that comes from a supply hopper or hopper through a vibration funnel 50. For the disintegration, the vibration funnel 50 has located therein a vibration generator 52 (also referred to as the so-called compactor) which oscillates, predominantly, in the horizontal direction. The vibration generator 52 can be operated continuously or can also be engaged with particularly difficult types of bulk material and with too small instantaneous loads in the dosing rotor 3, respectively, or also with highly variable instantaneous loads, how they could be defined and detected by determining thresholds. Whereby reliable supply of the bulk material to the dosing device 1 is ensured. Here, the vibration funnel 50 is elastically suspended in the frame 51, in particular through a compensator 54. In addition, the funnel of vibration 50 is connected to the housing 4 through a compensator 53, which decouples the vibration generator 52 to a large extent in order not to affect the result of the measurement, however, it still passes a certain portion of oscillation, in particular, in the horizontal direction (see arrow V in Figure 2) in order to produce vibrations in this way also in the housing 4 and in the metering rotor 3 rotating therein. With this, the clumping can be avoided, as well as the emptying process can be improved. As shown in Figure 3 in an enlarged view, two pivot bearings 18 are provided below the slide 6 to form a pivot shaft 8 around which the housing 4 could rotate when loaded with material. Viewed from above, this pivot axis 8 extends through the center of the upper loading opening 5 and the lower emptying hole 7 for the purpose of eliminating the effects of the errors caused by the supply and emptying of the load, so respective. Likewise, it is preferred that the vibration generator be located on this vertical axis A as shown in Figure 1. A driving means 9 is provided to drive the rotor 3 of the dosing device 1, the driving means 9 is constituted here for example by an electric motor not referred to in greater detail, and a bevel gear, the outlet of which opens to a vertical axis 25 (see Figure 4) that drives the rotor 3. In this case, the driving means 9 is directly mounted in the housing 4, so as to be adapted to follow any of the rotational movements about the indicated pivot axis 8. During the rotational movement about the pivot axis 8, such as that caused by the supply and feeding of material along the measuring section 2, the housing 4 supports a force measuring device 10 fixedly located in the structure 2 and which is connected, for example, with the housing 4 through a coupling rod. Different types of load cells could be used to represent the force measuring device 10, however, direct operating sensors such as strain gauges, shear force sensors, or the like are used. By doing so, the respective mass of the material flow that is being transported along the measurement section is detected, and the product of the instantaneous charge by the transport speed is detected to determine the flow velocity. The rotational speed of the driving means 9 and therefore of the rotor 3 is readjusted through the control device known per se and which is not shown in greater detail in order to modify the flow velocity or set a specific amount . As is apparent from FIG. 4, the drive flanges extending in the radial direction 11 of the rotor 3 simply have a partial height of the interior height of the housing 4. For feeding, the hopper 12 is passed through the upper housing wall 22 of housing 4, hopper 12 comprises an opening or lower discharge orifice which is preferred to be formed by bevel hopper 12. In this case, the drive flanges located in radial position 11 of rotor 3 are connected to each other through the peripheral ring 14, which causes a high stability of the rotor 3. Furthermore, this is an effect of the peripheral ring 14 extended almost to the upper housing wall 22 to prevent the bulk material fed through the opening or loading hole 5 in the hopper 12 is deflected outwards. The same is true for the blowing air jet for the disintegration of the bulk material, which is described below. In a preferred development, the upper ring 15 of the peripheral ring 14 is flanged outwards, so that the latter rotates with little play with respect to the housing cover 21. Here, a circumferential spacing 16 is formed between the peripheral ring 14 and the housing cover 21 to allow the finer particles of the bulk material to accumulate therein, if necessary so that they are also transported towards the emptying orifice 7 by means of the auxiliary cams 17. Preferably, the auxiliary cams 17 are formed by the outer ends of the drive flanges 11, for example, by placing the peripheral ring 14 on the drive flanges 11. It should be noted that the drain hole 7 protrudes lightly beyond the outer edge 14 in the radial direction, in this way, is in communication with the circumferential separation 16, so that the material present in the separation unferential 16 also falls down in the emptying hole 7 and therefore, is also detected in the measuring section with respect to the instantaneous load. Furthermore, in the circumferential separation 16 there is a positive pressure as in the discharge zone, so that the treatment capacity is facilitated and the particles are prevented from agglutinating, respectively. As mentioned previously, Figure 2 shows a side elevational view of the dosing device 1, wherein in particular, the trajectory of the pivot shaft 8 formed by the pivot bearings 18 could be observed. Further, the structure of the housing 4 is illustrated, which has a housing cover 21, an upper housing wall 22 and a lower housing wall 24 coupled with the upper housing wall 22, for example, by means of screw connections. 23. In addition to this, the vibration funnel 50 with the lower compensator 53 is indicated in dotted lines and dotted above the loading orifice 5. The force measuring device 10 shown in Figure 1 is located on the circumference of the housing 4 to achieve the The largest effective lever length possible, however, could also be mounted further or closer to the pivot axis 8. In addition to the already described components of the dosing device 1, FIG. 4 illustrates the drive axis 25 plotted in FIG. dotted lines from the cross section, which extends from the conical gear of the driving means 9 and communicates with a rotor hub 26 having radially located thereon the driving ridges 11. A rotor hub cover 27 is located above the rotor hub 26 and is of a height similar to that of the peripheral ring 14, in this way the hopper 12 is substantially secured between the ring p eriferic 14 and the rotor hub cover 27, as well as, defines the discharge zone. The trailing ridges 11 rotate on a wear plate 28 supported on the lower housing wall 24. In a preferred embodiment, the lower end portion 30 of the hopper 12 projecting towards the housing 4, extends down to the planes orbitals of the trailing ridges 11 with their half being oriented feeding direction, while their half orienting the feeding direction is provided with an opening or bevelled discharge orifice 13. Through this, the material flow of form of the shaft tip bushing is formed above the drive flanges 11 during the rotary movement of the dosing device 1 and is guided towards the emptying orifice 7. The hopper 12 is mounted on the upper housing wall 22 and is in communication with the connection piece of the slide 6 and the vibration funnel 50, respectively, through a flexible connection piece, for example, a band of rubber. Preferably, the end portion 30 is also formed as a flexible end portion, so that this end portion 30 of the hopper 12 is designed to be flexible with respect to the larger blocks of coarse fuel. Here, the essential part is to position a blower nozzle 31 directly above the material flow in the drain hole 7. By this, hot air or inert gas is supplied under pressure, by means of which, the material flow is blown down. By doing so in one way, the flow of material is separated and mixed in its entirety. In contrast to the compressed air known up to now, the hot air is better in the detachment of the agglutinations and in addition, the interior of the housing 4 is cleaned. At the same time, a gas barrier or protection against the downstream units is achieved, for example, a pneumatic supply line to a cylindrical rotary kiln for the production of cement, not shown, or a mill working under positive pressure . Apart from the exact radial alignment drawn here, it should be noted that the drive ridges 11 of the rotor 3 could also be realized in a slightly curved (in the feeding direction) or arc-shaped manner. In order to carry out the verification measurements, the dosing device 1 with its structure 2 can also be supported on the load cells (not illustrated), which are provided in the floor zone of the structure 2. In this In this case, these check load cells are in communication with the aforementioned control / regulation device, so that a continuous supply can be made from the supply hopper (s) according to the reference input (consumption). made out of fuel) .

Claims (11)

1. CLAIMS 1. A dosing device for the continuous gravimetric dosing of a material that can be discharged, particularly coarse fuels, where a flow of material is transported from a loading orifice to a drain hole in a housing with a rotor that is driven around a vertical axis of rotation, while instantaneous loading is determined through a measuring section and with a force measuring device that detects the instantaneous charge of the material flow guided by the rotor and that is connected to the housing that is mounted on a pivot shaft, characterized in that a vibration funnel is provided
2. (50) with a vibration generator (52) above the loading orifice (5) of the rotor (3). The dosing device according to claim 1, characterized in that the vibration funnel (50) is fastened with a compensator (54) in a frame (51) in a suspended arrangement, in particular, oscillating freely in all the directions in space.
3. 3. The dosing device according to claim 1 or 2, characterized in that the vibration funnel (50) is connected to a compensator (53) with the housing (4).
4. 4. The dosing device according to any of claims 1-3, characterized in that the vibration generator (52) is predominantly provided in an oscillating arrangement in a horizontal plane.
5. The dosing device according to any of claims 1-4, characterized in that the vibration generator (52) is located in line with the pivot axis (8) of the housing (4) in a vertical direction.
6. 6. The dosing device according to any of claims 1-5, characterized in that the vibration generator (52) is operated continuously.
7. The dosing device according to any of claims 1-6, characterized in that the rotor (3) with a peripheral ring (14), forming a circumferential spacing (16), has a diameter slightly smaller than the diameter of the housing (4), and the upper ring (15) is formed so as to extend towards an outward direction to cover the circumferential spacing (16).
8. The dosing device according to claim 7, characterized in that the auxiliary cams (17) are provided in the circumferential separation (16), the emptying orifice (7) protrudes beyond the outer limit (14) in one direction radial and communicates with the circumferential separation (16).
9. 9. The dosing device according to the preamble of claim 1 or any of the claims 1-8, characterized in that the blower nozzle (31) is located above the drain hole (7) and is aligned downwards, which is in particular operated with inert gas or hot air.
10. 10. The dosing device according to any of claims 1-9, characterized in that to verify the weights, the dosing device (1) is supported in load cells with its structure (2). The dosing device according to any of claims 1-10, characterized in that the vibration funnel (50) can be activated in case the variation of the instantaneous charges is very small or exceeds the established thresholds.