JPH044824Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is used to crush burnt lime discharged from a kiln that dries and burns lime mud discharged from the causticizing process of the kraft pulp manufacturing process. The present invention relates to a burnt lime pulverizer for producing kraft pulp that can improve the capacity and use efficiency of burnt lime.

[Conventional technology]

The lime mud discharged from the causticizing process, which is the final step in the recovery and regeneration process of cooking waste liquid during kraft pulp production, is dried and fired in a kiln (for example, a rotary kiln) and turned into lumps of burnt lime, which are then removed from the kiln. be discharged. The burnt lime lumps discharged from the kiln are crushed by a burnt lime crusher and fed into a slaker for the next slaked reaction. Such a process of crushing burnt lime is carried out at the terminal end of the vibrating conveyor 1, as shown in the side cross-sectional explanatory diagram of FIG. A plurality of vibrating conveyor case bars 2 are arranged parallel to the longitudinal direction of the vibrating conveyor 1 at predetermined intervals.
A lump of burnt lime S, which has been conveyed by the vibrations of the vibrating conveyor 1, is attached to the fixed shaft 4, which is provided above the vibrating conveyor case bar 2 and perpendicularly to the longitudinal direction of the vibrating conveyor 1, at its upper end. The part is rotatably attached, and when descending, the lower end hits the plurality of crushing bars 3 located between the vibrating conveyor case bars 2, and the vibrating conveyor case bars 2
The crushing bar 3 moves up and down due to the vibration of the burnt lime and the advancing force of the burnt lime lump S itself, and the burnt lime, which has been crushed into powder and coarse particles, is sent from the gap between the vibrating conveyor case bars 2 to the recovery process. It falls onto the screw conveyor 8 for transferring burnt lime and is thrown into a slaker (not shown). As shown in FIG. 4, which is an enlarged cross-sectional view taken along line B-B in FIG. However, in the lump S of burnt lime, there are often hard foreign substances mixed in that are difficult to crush even with the crushing bar 3, so the crushing bar 3 that hits them will crush the lump of burnt lime that is not crushed. The lumps S of burnt lime and hard foreign matter are pushed up in the direction of movement of the limestone S, and the lumps S of burnt lime and hard foreign matter proceed as they are on the vibrating conveyor case bar 2, and are automatically discharged outside the system via the large lump/grain chute 9 for discharge outside the system.

[Problem that the invention attempts to solve]

In the burnt lime crusher used in the burnt lime crushing process during the production of kraft pulp as described above, the crushing bars 3 are only rotatably attached to the fixed shafts 4, so after long-term use, the fixed shafts 4 gradually moves in the axial direction, and the intervals between the crushing bars 3 become irregular, and as a result, the burnt lime lump S is not crushed to the desired particle size, and even if it is crushed, the burnt lime powder and coarse particles are There was a problem that the sizes were uneven. Furthermore, the crushing bar 3 is generally a round bar made of iron, and its lower end must be positioned between the vibrating conveyor case bars 2, and the spacing between the vibrating conveyor case bars 2 depends on the particle size of the burnt lime to be crushed. Grinding bar 3 because the upper part cannot be made very wide.
At present, the size of the diameter of the grinding bar 3, that is, the weight of the grinding bar 3, is naturally limited. As a result, the grinding bar 3 becomes lighter, and the lumps S of burnt lime that should naturally be crushed are not sufficiently crushed and are wasted out of the system, resulting in a problem that the efficiency of using the burnt lime is reduced.

[Means for solving problems]

In order to solve the problems of the conventional burnt lime crusher for producing kraft pulp, the present inventors conducted various studies and found that the A grinding bar spacing regulating plate of a specific size is installed on the grinding bar to prevent the grinding bar from moving in the direction of the fixed axis, and an iron bar is fixed to the lower half of the grinding bar to provide a moment to the grinding bar. The inventors completed the present invention by discovering that even hard lumps of burnt lime could be reliably crushed by increasing the crushing capacity of the lumps of burnt lime by increasing the size of the grinding force.

That is, the present invention has a structure in which a vibrating conveyor is installed at the end of the vibrating conveyor for transporting lumps of burnt lime discharged from a kiln that dries and burns lime mud discharged from the causticizing process of the kraft pulp manufacturing process. A plurality of vibrating conveyor case bars are arranged in parallel at predetermined intervals, and the upper end is rotatable on a fixed shaft provided above the vibrating conveyor case bars and perpendicular to the longitudinal direction of the vibrating conveyor. A plurality of crushing bars are installed, and when descending, the lower end is located between each vibrating conveyor case bar. In a burnt lime crusher for producing kraft pulp that crushes at the position of the crushing bar and the crushing bar, the width is slightly narrower than the interval between each crushing bar at the upper part between the fixed shaft and the vibrating conveyor case bar, and the crushing bar is at the upper end. A kraft pulp characterized in that a grinding bar spacing regulating plate is provided at a height higher than the uppermost rotational position of the grinding bar, and an iron bar having a diameter smaller than the grinding bar is fixed above the bottom of the grinding bar. This relates to a burnt lime crusher for manufacturing.

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the burnt lime crusher for producing kraft pulp according to the present invention will be described in detail with reference to the drawings.

Fig. 1 is a side cross-sectional explanatory view showing a state in which lumps of burnt lime are crushed by an embodiment of the burnt lime crusher for producing kraft pulp according to the present invention, and Fig. 2 is a line A-A in Fig. 1. It is an enlarged sectional view.

In the drawing, 1 is a vibrating conveyor that transports lumps S of burnt lime discharged from a kiln (not shown) that dries and burns lime mud discharged from the causticizing process of the kraft pulp manufacturing process, and 2 is a vibrating conveyor. A plurality of vibrating conveyor case bars are provided at the end of the vibrating conveyor 1, supported and fixed by a case bar mounting rod 2a, and are arranged in parallel at predetermined intervals parallel to the longitudinal direction of the vibrating conveyor 1, 3 is a crusher. At the bar,
The upper end is rotatably attached to a fixed shaft 4 provided above the vibrating conveyor case bar 2 and perpendicular to the longitudinal direction of the vibrating conveyor 1, and when lowered, the lower end of each vibrating conveyor case bar 2 It has come to be located in between. Reference numeral 5 denotes a crushing bar spacing regulating plate, which is installed via an arm 6 between each crushing bar 3 at the upper part between the fixed shaft 4 and the vibrating conveyor case bar 2, and its width is equal to the distance between each crushing bar 3. The spacing is slightly narrower than the distance between the two, and the length is such that the upper end is located at a height higher than the uppermost rotational position of the crushing bar 3 (i.e., the position of the crushing bar 3 that rotates to the highest point when it hits the lump S of burnt lime). It has a long length. Reference numeral 7 denotes an iron bar whose thickness is less than or equal to the diameter of the crushing bar 3, and is fixed so as not to protrude laterally above the lower part of the crushing bar 3, that is, on the opposite side to the surface on which the lump S of burnt lime comes into contact. There is. 8 is a burnt lime screw conveyor for sending the burnt lime, in which the lump S of burnt lime is crushed into powder or coarse particles, to the next process;
Reference numeral 9 denotes a large agglomerate chute for discharging uncrushed burnt lime lumps S out of the system.

In such a burnt lime crusher for producing kraft pulp, the burnt lime lump S discharged from the kiln is
is transferred onto the vibrating conveyor case bar 2 while being vibrated by the vibrating conveyor 1, and when this lump S of burnt lime hits the crushing bar 3, it is affected by the pressing force due to the weight of the crushing bar 3 and the vibration of the vibrating conveyor case bar 2. It is crushed by the force of the lump S of burned lime itself, which is pushed out from behind and moves forward. Powder and coarse particles of burnt lime produced by crushing fall onto the burnt lime screw conveyor 8 from between the vibrating conveyor case bars 2, and are then fed into a slaker (not shown) for the next process. On the other hand, unpulverized lumps among the lumps S of burnt lime push up the grinding bar 3, advance on the vibrating conveyor case bar 2, and are discharged outside the system by the large lump granule chute 9 for discharge outside the system.

[Effect]

In the burnt lime crusher for producing kraft pulp according to the present invention having the above-described structure, the upper part between the fixed shaft 4 and the vibrating conveyor case bar 2 has a width slightly narrower than the interval between the respective crushing bars 3, and the upper end By providing the grinding bar spacing regulating plate 5 which is located at a height higher than the uppermost rotational position of the grinding bar 3,
Even if the crushing bar 3 tries to shift in the axial direction of the fixed shaft 4, it hits the end face of the crushing bar spacing regulating plate 5, preventing the crushing bar 3 from shifting, and the crushing bar 3 hits the lump S of burnt lime and rotates upward. Even if the grinding bars 3 are used for a long period of time, the grinding bars 3 will not be displaced in the direction of the fixed shaft 4 beyond the upper end of the grinding bar spacing regulating plate 5, so that the grinding bars 3 will always be kept at the same spacing even if used for a long period of time. As a result, the burnt lime powder and coarse particles produced by crushing the burnt lime lump S always maintain a particle size below a certain level. Further, on the upper side of the lower part of the crushing bar 3, that is, the surface opposite to the surface that is in contact with the lump S of burnt lime, an iron bar 7 having a diameter smaller than that of the crushing bar 3 is fixed so as not to protrude to the side of the crushing bar 3. As a result, the weight of the lower part of the crushing bar 3 increases, and as a result, the moment acting on the crushing bar 3 increases, so that even a hard lump of burnt lime S can be sufficiently crushed. Since the particles do not block or narrow the space between the crushing bars 3, the burnt lime powder and coarse particles fall smoothly onto the burnt lime screw conveyor 8.

[Effect of idea]

As detailed above, the burnt lime crusher for producing kraft pulp according to the present invention has a specific width at the upper part between the fixed shaft to which the upper end of the crushing bar is rotatably attached and the vibrating conveyor case bar. By providing a crushing bar interval regulating plate with a length, the horizontal movement of the crushing bars is prevented, and even after long periods of use, the intervals between the crushing bars are always maintained at equal intervals, which prevents lumps of burnt lime from forming. The powder and coarse particles of burnt lime produced by crushing always maintain a particle size below a certain level, and the weight of the lower part of the crushing bar is reduced by having an iron bar fixed above the bottom of the crushing bar. increases, and a large force acts on the lower part of the crushing bar where the lump of burnt lime hits, so even hard lumps of burnt lime can be sufficiently crushed, and as a result, the efficiency of using the burnt lime can be improved. Therefore, its practical value is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a side cross-sectional explanatory view showing a state in which lumps of burnt lime are crushed by an embodiment of the burnt lime crusher for producing kraft pulp according to the present invention, and Fig. 2 is a line A-A in Fig. 1. An enlarged cross-sectional view, FIG. 3 is a side cross-sectional explanatory view showing a state in which lumps of burnt lime are crushed by a conventional burnt lime crusher for producing kraft pulp, and FIG. 4 is an enlarged cross-section taken along the line B-B in FIG. 3. It is a diagram. DESCRIPTION OF SYMBOLS 1... Vibrating conveyor, 2... Vibrating conveyor case bar, 2a... Case bar mounting rod, 3... Crushing bar, 4... Fixed shaft, 5... Crushing bar interval regulation plate, 6... Arm, 7... ...Iron bar, 8...Burned lime screw conveyor, 9...Large lump granule chute released outside the system, S...Lump of burnt lime.

Claims (1)

[Scope of utility model registration request] Parallel to the longitudinal direction of the vibrating conveyor 1, a belt is installed at the end of the vibrating conveyor 1 that transfers lumps S of burnt lime discharged from a kiln that dries and burns lime mud discharged from the causticizing process of the kraft pulp manufacturing process. The upper end rotates around a plurality of vibrating conveyor case bars 2 arranged in parallel at predetermined intervals and a fixed shaft 4 provided above the vibrating conveyor case bars 2 and perpendicular to the longitudinal direction of the vibrating conveyor 1. A plurality of crushing bars 3 are freely attached and the lower end is located between each vibrating conveyor case bar 2 when lowered.
In a burnt lime crusher for producing kraft pulp, the burnt lime lump S, which is conveyed while vibrating from the vibrating conveyor 1, is crushed at the position of the vibrating conveyor case bar 2 and the crushing bar 3. , a grinding bar interval at the upper part between the fixed shaft 4 and the vibrating conveyor case bar 2, the width of which is slightly narrower than the interval between the grinding bars 3, and whose upper end is located at a height higher than the uppermost rotational position of the grinding bars 3. A regulating plate 5 is provided, and a crushing bar 3 is provided on the upper side of the lower part of the crushing bar 3.
A burnt lime crusher for producing kraft pulp, characterized in that an iron bar 7 having a diameter of less than or equal to is fixedly installed.