JPH0711791Y2 - Partition center metal fittings with tube mill flow rate adjustment function - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a tube mill for crushing limestone and other ores and rocks as a raw material for cement, especially an inlet-side crushing chamber and an outlet-side crusher which are divided along the axial direction. The present invention relates to a novel technique regarding a mill that constitutes a partition to form a chamber.

[Prior Art] A tube mill rotates a crushing chamber by mixing an object to be crushed (raw material lime, etc.) and a crushing medium (steel rod, steel ball, etc.) in a cylindrical crushing chamber, and by mutual collision and rubbing action. This is a device for pulverizing. Since the crushing efficiency is increased and the action progresses with a small energy consumption rate, the crushing chamber is divided into a large mass of crushing medium for the raw material on the inlet side and a small mass for the raw material that has already advanced to some extent on the outlet side. It is customary to carry out the crushing by tying the crushing media of the lumps together. A conventional partition structure for partitioning the tube crushing chamber for this purpose is shown in FIG. 4, in which a partition plate 1a is fixed to the tube body D and installed on the partition frame 1a on the inlet side, and the partition plate 1a on the outlet side. The partition blind plates 2a are attached to each other to form a storage chamber 4a by the gap between them. Fifth
The figure is an enlarged cross-sectional view of only this partition portion, and the crushed material that has entered from the inlet side crushing chamber Ca-1 into the reservoir chamber 4a is centered along the partition blind plate 2a as the tube body D rotates. It slides down toward and is guided here to the next outlet side crushing chamber Ca-2 from the central opening 11a along the conical surface of the cone-shaped central metal 5a. An air flow is blown into the tube mill body from the inlet side to the outlet side, and this air flow forms a flow path as shown by the arrow in FIG. It works effectively to prevent deterioration of crushability due to rise.

Next, in the partitioning section of the prior art shown in FIGS. 4 and 5, only the function of sieving the object to be crushed and simply moving it to the next crushing chamber is achieved, but each crushing chamber (in the compartment)
In order to control the amount of raw material in the outlet side crushing chamber, the efficiency of crushing is greatly affected by the ratio of the amount of raw material mixed with the crushing medium, and also has a significant effect on the particle size distribution of the final crushed product. There is another prior art proposal to add a special configuration to the partition. It is "a method for controlling the amount of material in a crushing section of a tube mill and a partition used for this" (Japanese Patent Publication No. 53-7653, Fig. 6), in which a partition plate 1b and a partition blind plate 2b are provided in a frame 3b. It is no different from the conventional method that the chamber 4b is attached to form the accommodating chamber 4b, and the cone-shaped central metal 5b is fitted in the center of the partition. A feature is that a frame 12 is provided to partition the inside of the reservoir 4b from the center, an opening 13 is formed in this frame, and a long vertically split semi-cylindrical scoop 14 connected to this opening is horizontally installed in the reservoir. In addition, the inclination of the scoop 14 on the horizontal plane is variably configured. The object to be crushed passes from the entrance side crushing chamber Cb-1 through the eyes of the partition plate 1b and the accumulation chamber 4b.
, And the scoop 14 is buried, but only the crushed object stored inside the semi-cylindrical shape as the tube rotates is lifted up and slides down by gravity in the upper half of the tube and passes through the opening 13. The central metal 5b (referred to as a baffle plate) slides on the conical surface and is guided from the central opening 11b to the next outlet side crushing chamber Cb-2. Therefore, by adjusting the angle of the scoop 14 with respect to the horizontal, the amount of crushed objects to be scooped from below can be changed, and the raw material level in the sump chamber, and consequently the raw material level in Cb-2, can be freely adjusted for optimum operation. It is said that the crushing conditions of can be obtained. Further, in Japanese Patent Publication No. 57-56376 shown in FIG. 7, an inlet side crushing chamber side (coarse crushing chamber side) is provided with an eye plate 1c, and an outlet crushing chamber side (fine crushing chamber side) is provided with a blind plate 2c. Is set up and a hollow reservoir 4c (lifting wall) is set between them. The axial center side of this hollow chamber is adjacent to the central metal 5c (transmission cone) with an opening 7c,
The structural feature is that the chamber is divided in the circumferential direction and a long lifting blade 101 is attached, and the end portion is sandwiched between adjacent side plates 102 of a central metal piece of a split type (segment) and fixed by bolting. It is in. When this form is adopted, the amount of the object to be crushed that enters from the opening to the adjacent outlet side crushing chamber along the conical surface of the central metal object is that after coarse crushing, it passes through the eye plate and enters the hollow reservoir The length of the lifting blade extending into the chamber controls the flow rate of the crushed object, because it depends on how much the crushed object is lifted in the chamber and guided toward the axial center. (Known so far) Conventionally, this lifting blade does not move as it is once attached, and therefore has no function of adjusting the flow rate of the object to be crushed. If the operating conditions change, such as changes in the properties of the material to be crushed or changes in production, the bolts that have been fixed are pulled out, and the protruding length of the lifting blade in the circumferential direction is expanded / contracted to change the fixing position By doing so, it is said that it is possible to change the lifting amount of the crushed material that has entered the storage chamber and make adjustments that follow the changes in operating conditions.

[Problems to be Solved by the Invention] As described above, the prior art cited first has no function of adjusting the flow rate in the partition, and adjustment for improving the pulverization efficiency is possible only by the input amount at the inlet. However, even if the properties of the raw material (particle size or hardness) change, it is not possible to make minute adjustments that accurately correspond to it. Further, since the cone-shaped central metal 5a is fitted in the center, the circulation of cooling air is cut off at the mill axis, so that the pressure loss is large and the cooling action is significantly reduced.
The problem remains that the crushing efficiency deteriorates due to the temperature rise of the object to be crushed. In addition, the prior art cited below (Fig. 6) has a function of adjusting the raw material level in the outlet side crushing chamber, and a grid 15 is provided on the inlet side of the cone-shaped central metal 5b for moving the cooling air. It is understood that the central opening 11b is provided on the exit side and the problem of the above-mentioned reference is successfully corrected. However, there are many blind spots in the room because the scoop and its mounting equipment are installed in the narrow storage chamber, and there is a concern that powder will accumulate and solidify in this area and obstruct the smooth flow of crushed objects and air. . Since the partition plate and the partition blind plate are divided into radial sections of the tube and mounted on the frame as a large number of fan shapes, a large number of frame bodies cross from the reservoir chamber to the central metal piece, and powder tends to accumulate and solidify. The result is spurs. For this reason, maintenance and inspection work to maintain the original function becomes more difficult, and if the device is locally worn due to the use of the device, the entire central metal fitting including the scoop and its mounting members must be renewed, which increases costs.
This may lead to an increase in the number of repair days and loss of opportunity due to suspension of operations, which may have an unfavorable effect on productivity and economics. Further, in the conventional technique shown in FIG. 7, the reservoir is a space having a very narrow width between the facing eye plate and the blind plate and a wide cross-sectional area over almost the entire cross section of the huge tube mill. However, by fixing a long lifting blade, which is about half the radius even if it is short in the circumferential direction, and 70% if it is long, it is possible to form a blind spot in the flow of the crushed object in the room and to make a smooth flow at once. It becomes an obstacle to prevent Generally, the object to be crushed by the tube mill is mainly cement clinker, and it escapes from the tendency of sticking and depositing on the surface of each member in the reservoir due to the moisture contained at high temperature in summer. Although difficult, it is undeniable that if an abnormal member projects across the reservoir, this tendency will be spurred and troubles that prevent normal powder flow will be encountered. Also,
Although the crusher has an inevitable fate to replace the wear of the members, it is a segment that is integrated by bolting to renew the divided central metal parts and the lifting blades sandwiched between the divided surfaces due to wear during operation. It means that the central metal piece is disassembled, and the number of the members is large, and the work of reassembling the individually disassembled members is complicated and inefficient, and the maintenance disadvantage is unavoidable.

Considering the pros and cons of the flow rate adjusting function, which is the object of the invention, when the tube mill becomes the largest scale, it consists of a cylindrical body with a diameter of close to 6 m, so if the total length of the lifting blades installed in the reservoir is long, it can reach 2 m. Expected to extend. The heavy and long blades do not retain their original shape because they are exposed to the severe conditions of abrasion and deformation due to heat generated by collision of the equipment, direct impact of heat generated by collision and impact force, and distortion of the clinker as already explained. Moisture is a disaster, and from the blade to the mounting member,
The clinker is fixedly deposited on all the surfaces reaching the support member, and once the long blade is installed, the bolt is loosened and the position is changed to adjust the protruding length in the room mainly by hand. Will be forced into a difficult task that is almost impossible.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention aims to provide a central metal product having a function of adjusting a raw material level in a partition part and having little opportunity for powder solidification and solidification.

[Means for Solving the Problem] A partition center metal having a flow rate adjusting function of a tube mill according to the present invention comprises a partition plate 1 mounted on a frame radially assembled across a cylindrical grinding chamber and the partition plate 1. A reservoir chamber 4 is formed between the eye plate 1 and a partition blind plate 2 which is opposed to the eye plate 1 with a slight gap, and the reservoir chamber 4 is attached to the center and connected to the reservoir chamber 4. In the center metal part of the partition of the tube mill that guides the crushed material to the next crushing chamber on the outlet side, the center metal part 5 for partitioning is composed of a disc-shaped eye plate 10 on the front side facing the crushing on the inlet side A plurality of communication holes 6 that communicate with the reservoir 4 are formed at a position where the cylindrical surface of the opened central opening 11 is an outer shell, and the cylindrical surface of the cylindrical body is radially divided from the axis.
A bulge 8 that surrounds three sides of the communication hole 6 and forms a pocket-shaped opening 7 only in the direction of the central opening 11 toward the axial line. The above problem is solved by detachably mounting the adjusting plate 9 arbitrarily selected from a plurality of types of plate widths W so as to maintain a desired opening area between the surfaces.

[Operation / Embodiment] The operation of the present invention will be described based on FIG. 1 (front sectional view), FIG. 2 (left side view), and FIG. 3 (right side view) showing an embodiment of the present invention.

The figure is an enlargement of only the central part of the partition part of the tube mill. In FIG. 2, assuming that the left side is the inlet side crushing chamber C-1 and the right side is the outlet side crushing chamber C-2, as shown in FIG. -1
On the side, a partition plate 1 is attached to a partition blind plate 2 which is spaced apart from each other on a partition frame 3 which stands upright in the tube to form a reservoir chamber 4.

A plurality of communication holes 6 are evenly distributed and opened on the cylindrical surface of the central metal 5, and as shown in FIGS. 1 and 3, the inner peripheral side of the communication holes 6 is open toward C-2. A bulge 8 having 7 is projected toward the axis X of the mill, and adjusting plates 9 are fitted in the openings 7. In this embodiment, an L-shaped steel plate is screwed near the open end of the bulging body 8 as shown in the figure, but any other attachment / detachment method can be applied. The adjusting plate 9 is prepared in advance in several types having different plate widths W, provided that the adjusting plate 9 can be fitted into the opening 7.

As shown in FIG. 2, the surface facing the C-1 side is a disc-shaped eye plate 10 having a maximum opening within the range in which the grinding medium is not allowed to pass.
The central opening 11 communicates with the entire C-2 side.

Here, the maximum crushing efficiency can be obtained by selecting and fitting the plate width W of the adjusting plate 9 so as to obtain the optimum opening degree according to the change in the property of the crushed object.

Regarding ventilation resistance, as shown in the arrow in Fig. 1, in the range of the partition plate, it enters the reservoir chamber along with the flow of the crushed object and is bent at a right angle, and then is refracted again in the axial direction through the communication hole to exit side crushing chamber. There is no member in the flow path that is introduced into the central part and there is no resistance to the flow path. .

[Effect of the Invention] As described above, the present invention has the effect of reducing the pressure loss because there is no central metal on the axis of the tube mill that obstructs ventilation, and prevents the deterioration of the grinding efficiency. Moreover, not only does the ventilation from the front of the central metal block not be propagated to the next crushing chamber, but also the ventilation and the flow of the crushed material in the peripheral partition plate area are forcibly aggregated in the axial direction of the tube mill to improve crushing efficiency. There is also an effect of realizing further improvement.

In addition, the central metal has a function of adjusting the raw material level to the optimum for operating conditions, but has a simple structure, less powder solidification (condensation), and less risk of narrowing or clogging of the flow path. Yes. The flow rate is adjusted by replacing the adjustment plate 9 and resetting the opening area. As is clear from FIG. 1, this replacement is such that when the operator enters the crushing chamber on the outlet side, the mounting bolt of the adjusting plate is exposed in front of the operator,
It is no exaggeration to say that there is no other convenient position to replace by hand. Also, as a matter of course, since the member that serves as the adjusting function is not inside the reservoir, there is no obstacle that obstructs the smooth flow of the crushed material in the reservoir, and although the clinker is unavoidably adhered, it is most likely to adhere. There are no members across the flow that are susceptible to flow resistance that tends to accumulate.

When viewed at the implementation stage, the conventional partitioning mechanism added a function to adjust the material level to the optimum level even if it could only play the role of partitioning.Therefore, a partition frame, a partition plate, a partition blind plate, a central metalwork, a scoop and It was necessary to attach a large number of parts such as its attached parts, and the construction work was large, and there was a problem that the number of days of operation stoppage was long, but in the case of the present application, it can be easily remodeled by simply replacing the central metal parts of the existing partitioning mechanism. Since the present invention can be carried out in this way, there is an effect that the merit brought to the user side is very large.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front sectional view of an embodiment of the present invention, FIG. 2 is a left side view of the same, FIG. 3 is a right side view of the same, and FIG. 5 and 5 are front sectional views of the central metal and the vicinity of the reservoir, FIG. 6 is a front sectional view showing another prior art, and FIG. 7 is a plan view (A) and a front sectional view of yet another prior art. Figure (B). 1 ... Medium partition plate, 2 ... Blind plate, 3 ... Frame 4 ... Reservoir, 5 ... Central metal part, 6 ... Communication hole 7 ... Opening part, 8 ... Swelling body, 9 ... … Adjusting plate 10 …… Disc-shaped eye plate, 11 …… Central opening C-1 …… Inlet side crushing chamber C-2 …… Outlet side crushing chamber A …… Tube mill axis W …… Adjusting plate width

Claims (1)

[Scope of utility model registration request] 1. A reservoir chamber between a partition plate 1 mounted on a frame radially assembled across a cylindrical grinding chamber and a partition blind plate 2 facing the partition plate 1 with a slight gap. A partition center metal part of a tube mill that forms a No. 4 and guides an object to be crushed, which is installed in the center connected to the reservoir chamber 4 and enters the reservoir chamber from the inlet side crush chamber, to the next outlet side crush chamber. 5, a front surface facing the inlet side crushing chamber is made of a disc-shaped eye plate 10, and a cylindrical body made of a central opening 11 which is fully opened to the outlet side crushing chamber is defined as an outer shell, and the cylindrical surface of the cylindrical body is an axis line. A plurality of communication holes 6 communicating with the reservoir chamber 4 at radially regularly divided positions from the
A bulge 8 that surrounds three sides of the communication hole 6 and forms a pocket-shaped opening 7 only in the direction of the central opening 11 toward the axial line. A partition center equipped with a flow rate adjusting function of a tube mill, in which an adjusting plate 9 arbitrarily selected from a plurality of types of plate width W so as to maintain a desired opening area between the surfaces is detachably attached hardware.