JPH0128826Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a supply chute for a granular material crushing device that uses a rotating round table and a plurality of roller-like members rotating on the outer periphery of the round table to crush granular materials supplied to the round table. This is related to the improvement of.

The granular material crushing device already proposed by the present applicant will be explained with reference to FIGS. 6, 7, and 8. 1 is a drive device, 2 is a round table that is rotated in a horizontal plane by the drive device 1, and above the table is a pulverization drying chamber. A chute 4 for supplying granular material to the drying chamber 3 is provided so as to protrude into the drying chamber 3 from the outside. In addition, several rollers (or balls) 5 are supported on a shaft 7 passing through the milk case cinder 6 of the drying chamber 3, which presses the granular material supplied onto the round table 2 onto the round table 2 and rotates with the round table 2. There is. Further, an annular opening 8 is provided between the round table 2 and the casing 6 for ventilation and for coarse particles to fall, and directly below the opening 8,
A discharge passage 9 is provided, and around the opening 8,
A hot air chamber 10 for supplying gas to the opening 8 is provided. Moreover, above the grinding drying chamber 3,
A rotary blade 11 rotated by a motor (not shown) concentric with the round table 2, and a fine powder-containing gas outlet 1
An air classifier 13 comprising 2 is provided. In addition, a mechanical conveyor 14 connected to the crushed material discharge path 9 and a bucket elevator 15 for transporting the discharged coarse particles to the supply chute 4 are provided.

Next, to explain the operation of the granular material crushing device using the example of crushing cement raw materials, the exhaust gas from the suspension preheater (not shown) of the firing device is as follows.
Among the granules, which are ejected from the hot air chamber 10 through the opening 8 into the crushing drying chamber 3 by an induction fan (not shown), and moved to the opening 8 by the centrifugal force generated by the rotation of the round table 2, , only relatively fine particles are blown upward and guided to the air classifier 13 along with them. At this time, the rotor blades 11 of the classifier 13 rotate to form a swirling flow.
The coarse powder is separated and the gas containing the fine powder is discharged to the outside of the mill from the fine powder-containing gas outlet 12 located at the center of the top. On the other hand, the granular material supplied from the granular material supply chute 4 onto the round table 2 is moved to the outer periphery of the round table 2 by the centrifugal force generated by the rotation of the round table 2, and is moved to the outer periphery of the round table 2 by the roller 5 provided here. Due to the downward pressing force, it is caught between the round table 2 and crushed and crushed. Note that the amount of hot air is limited to the level necessary for drying, and the rising wind speed at the opening 8 is set to 10 to 25 m/s, so that among the crushed materials that have moved to the opening 8, relatively fine particles, It is blown away by the gas jet, and a part of it is guided to the air classifier 13,
The rest is blown back onto Round Table 2. Also, the opening 8
The relatively coarse particles that were not blown away fall from the opening 8 through the crushed material discharge path 9 onto the mechanical conveyor 14 and are led to the supply chute 4 via the mechanical conveyor 14 and bucket elevator 15. It will be destroyed. Further, the powder guided to the air classifier 13 is beaten by the rotary blade 11 and centrifugal force is applied to it, causing the coarse powder to be blown toward the surrounding wall, then fall along the wall surface, and returned to the round table 2. . On the other hand, the fine powder that has passed through the rotary blade 11 is discharged from the upper fine powder-containing gas outlet 12 and collected as a product by a collector (not shown).

In the granular material crushing device, the granular material falls onto the round table 2 rotating in the direction of the arrow 22 with the width a to b of the chute 4 shown in FIG. 21 direction while spreading across widths a' to b'.
Since the material is crushed and crushed only between the rollers 5 and the rotating round table 2, the load on each roller 5 becomes uneven, causing uneven wear on each roller 5. Furthermore, as mentioned above, the load on each roller 5 becomes uneven, which causes vibrations and a decrease in grinding efficiency. Furthermore, the 8th
The dotted arrows in the figure indicate particulate matter blown back onto the round table 2 by the gas jet around the outer periphery of the round table 2.

Although not shown, in another conventional example of a granular material crushing device, the supply chute is extended above the center of the round table, and the lower end of the supply chute is opened vertically downward, so that the granular material is transported to the center of the round table. There are also things that can be dropped upwards. In this case, the granules that have fallen from the supply chute onto the round table are evenly dispersed and moved toward the entire outer circumference of the round table, so the load on each roller becomes uniform, but as is clear from FIG. The ratio of the rolling part (rolling part) to the round table top is relatively small, and most of the granules pass through the roller part without being bitten by the rollers and overflow from the outer periphery of the round table. As a result, the pulverizing efficiency was reduced as in the granular material pulverizing apparatus shown in FIGS. 6 and 7. Also, since there are many granular materials overflowing from the outer periphery of the round table,
Conveyor power was increased.

This proposal addresses the above-mentioned problems, and is a granular material crushing device that uses a rotating round table and a plurality of roller-like members that rotate on the outer periphery of the round table to crush granular materials supplied to the round table. A bottomed distributor is provided at the bottom of the supply chute that guides the granular material above the center of the round table, and a plurality of granular material supply ports are provided on the side of the distributor corresponding to each of the roller-like members. The purpose of the granular material crushing device is to equalize the load on each roller-shaped member and prevent uneven wear of each roller-shaped member. Another object of the present invention is to provide an improved supply chute for a granular material crushing device that can reduce the amount of granular materials that pass through without passing through each roller-like member and improve the pulverizing efficiency.

Next, the supply chute of the granular material crushing device of the present invention will be explained with reference to an embodiment shown in FIGS. 1, 2, and 5.
2 is a rotating round table, 4 is a supply chute extending above the center of the round table 2, 5 is three rollers (or balls) in this embodiment, and 40 is a cylindrical shape provided at the bottom of the supply chute 4. 41 is a bottom cover that closes the bottom of the distributor 40, 42 is a granular material supply port provided on the side of the distributor 40, and in the case of this embodiment, the granular material supply port 42 is 3 There are two rollers, each corresponding to each roller 5. Note that the bottom cover 41 is located directly above the center of the round table 2.
The other configurations are the same as those shown in FIGS. 6 and 7 above.

Next, the operation of the supply chute of the granular material crushing device will be explained. The granular material that has entered the distributor 40 through the chute 4 falls onto the bottom cover 41 and is further discharged onto the round table 2 from the granular material supply port 42 . The supply ports 42 are provided on the side wall of the distributor 40 in correspondence with the respective rollers 5, and the granular material discharged onto the round table 2 from the respective supply ports 42 is directed to the arrow 2 in FIG.
It heads toward each roller 5 in a converged state as shown in FIG. In other words, the opening width and the circumferential position of each supply port 42 are such that the granular material can reach the round table 2 as shown in FIG.
It is set in consideration of the curved trajectory when moving on the top, and the granular material is placed in the rolling part 30 of each roller 5.
be led to. Further, the opening area of each supply port 42 is set so that the particulate matter does not block the inside of the distributor 40. Further, the lower end of the distributor 40 is close to the upper surface of the round table 2 to minimize scattering due to impact when the granules fall from each supply port 42 to the round table 2. However, the distributor 40 is maintained at a height that prevents particles from getting caught between the round table 2 and the distributor 40 and damaging the device. In Figures 1 and 2 above, the distributor 40 has a cylindrical shape, but in Figures 3 and 4, the lower part of the distributor 40 is shaped like a cone, and each supply port 42 provided therein is inclined. , the discharge of the agglomerates from the distributor 40 to the round table 2 becomes easier.

The supply chute of the granular material crushing device of the present invention is configured as described above, and the granular material supplied to the round table is supplied to each roller-shaped member evenly and in a focused state, and is bitten. Therefore, the load on each roller-shaped member can be made equal, and uneven wear of the roller-shaped members can be prevented. In addition, with the structure described above, it is possible to reduce the amount of granular material that passes through each roller member without passing through, thereby improving the crushing efficiency. It is useful for application to roller mills, ballless mills, etc.

[Brief explanation of drawings]

Fig. 1 is a side view showing one embodiment of the supply chute of the granular material crushing device according to the present invention, Fig. 2 is a cross-sectional plan view taken along the arrow line in Fig. 1, and Fig. 3 shows another embodiment. FIG. 4 is a cross-sectional plan view taken along the arrow line in FIG. 3, FIG. 5 is an explanatory diagram of its operation, and FIG.
FIG. 7 is a plan view taken along the line, FIG. 7 is a side view thereof, and FIG. 8 is an explanatory diagram of its operation. 2... Round table, 4... Supply chute, 5... Roller-shaped member, 40... Distributor, 41... Bottom cover thereof,
42... Granular material supply port.

Claims (1)

[Scope of utility model registration request] A granular material crushing device for pulverizing granular materials supplied onto the round table using a rotating round table and a plurality of roller-like members rotating on the outer periphery of the round table,
A bottomed distributor is provided at the bottom of the supply chute that guides the granular material above the center of the round table, and a plurality of granular material supply ports are provided on the side of the distributor, corresponding to each of the roller-shaped members. A supply chute for a granular material crushing device characterized by: