CN1003283B

CN1003283B - High fine tube mill

Info

Publication number: CN1003283B
Application number: CN85106781.6A
Authority: CN
Inventors: 蒋玉灿
Original assignee: HEFEI CEMENT RESEARCH and DESIGN INSTITUTE OF STATE ADMINISTRATION OF BUILDING MATERIALS
Current assignee: HEFEI CEMENT RESEARCH and DESIGN INSTITUTE OF STATE ADMINISTRATION OF BUILDING MATERIALS
Priority date: 1985-09-09
Filing date: 1985-09-09
Publication date: 1989-02-15
Also published as: CN85106781A

Abstract

A high-fine tube grinding machine achieves the effect of high-fineness grinding by installing a novel material ball separating device and a novel material forging separating device in the grinding machine and adjusting the gradation of three-bin material balls . Industrial tests prove that the mill has good performances. Under the condition of first-level open flow, the grinding effect on various kinds of cement can reach a specific surface area of 5500 cm²More than g. For the ground fly ash clinker-free cement, the specific surface area can reach 7000 to 8000 cm²(ii) in terms of/g. And has the characteristics of simple structure, convenient processing, reasonable mill process flow, obvious electricity-saving effect and the like.

Description

High tubule mill

The invention relates to a grinding machine, which is mainly used for grinding materials finely and can be widely applied to industries such as building materials, metallurgy, chemical industry, refractory materials, pigments and the like. The high-strength cement grinding machine is particularly suitable for the cement industry, cement is subjected to high-fineness grinding to manufacture high-strength cement, or mixed materials are added after the high-fineness grinding, so that the cement yield is increased under the condition of ensuring that the grade is not changed.

As is well known, in many industries such as building materials, metallurgy, chemical engineering, etc., materials need to be ground into fine powder, but the requirement is difficult to meet by using a common tube mill. After the material is ground to a certain fineness, the phenomena of material sticking and aggregation often occur, and the normal work of the grinding machine is influenced. Reference is made to the prior art in US-3964717. A small bin is arranged between a first bin and a second bin of a common mill. The small bin is connected with the first bin through a common bin partition plate and connected with the second bin through a blind plate. The small bin is divided into a front half bin and a rear half bin by using an intermediate partition plate, a hole is formed in the position, far away from the mill cylinder, of the intermediate partition plate, and the front half bin and the rear half bin of the small bin are communicated. In the first half of the small bin (i.e. near the first bin part), no material raising device is used, so that the first half is at the same level as the first bin. The second half cabin (namely, the part close to the second cabin) of the small cabin is internally provided with the material lifting devices, and the material in the second half cabin is conveyed into the second cabin through the material lifting devices. Through set up little storehouse between first, the two storehouses of second, can make the material in the first storehouse keep a stable charge level, intermediate bottom in the little storehouse is owing to just trompil (i.e. use overflow type perforated plate) keeping away from mill barrel position for the material can obtain comparatively effectual grinding in first storehouse. Adopt the blind plate of central trompil to be connected between little storehouse and second storehouse for in the rinding body in the second storehouse is difficult for backward scurrying into little storehouse, in the latter half storehouse of little storehouse, use the lifting device moreover, make the material can get into the second storehouse smoothly, moreover, even there is a small amount of rinding body to scurrying into the latter half storehouse of little storehouse by the second storehouse, also can make it return to the second storehouse through the lifting device, guaranteed not have the rinding body state in the little storehouse.

Although the grinding process in the mill can be more stable by the mill, the problem of high-fineness grinding can not be obviously solved under the condition of primary open flow. Especially, the small bin behind the first bin can not realize the thickness separation of the materials, so that the materials entering the second bin and the materials entering the small bin from the first bin have the same fineness. When the above mill is used to grind the material to high fineness (such as cement to 3400 cm)²Above/g), the materials are seriously aggregated and agglomerated in the grinding machine, thus hindering the high-fineness grinding. At the moment, the unit power consumption of the ground materials rises rapidly, the fixing screws on the lining plate are frequently broken, and the lining plate falling accident also frequently occurs. Meanwhile, due to the fact that the temperature in the mill is too high, materials can be modified, such as ground cement, gypsum can be dehydrated, and cement false set can be formed. In addition, the mill is adjustable for maintaining the position of the intermediate perforated plate (which allows the grinding state to be optimized), resulting in complicated fixing and assembling.

The invention aims to manufacture a novel one-stage open-flow high-tubule mill, and when cement is ground, the specific surface area can reach 5500cm²The specific surface area can reach 7000 to 8000cm when the fly ash clinker-free cement is ground²And/g, thereby meeting the production requirements of producing high-strength, quick-hardening and even ultrahigh-strength cement by a primary open flow type process flow. And the requirements of the mill equipment are simple processing, convenient installation, low power consumption and material saving, so as to overcome the defects of the prior art.

The invention is formed by modifying the existing one-stage open-flow multi-bin tube mill. The vicious grinding problems of material aggregation, viscous medium, lining and counting plate existing in the common tube mill during the high-fineness grinding operation are solved by changing the internal structure of the mill and the grading of the grinding body. The specific method is as follows: a small bin is installed between a first bin and a second bin and is used as a material ball separating device, the small bin is connected with the first bin through an overflow type bin partition plate and connected with the second bin through a hole-opening blind plate, the small bin is divided into a front half bin and a rear half bin through an overflow type calculating plate inside the small bin, a steel ball with a small ball diameter is used as a grinding body in the front half bin, a plurality of double-layer arc-shaped separating sieves are installed in the rear half bin and mainly used for screening materials entering the rear half bin of the small bin, the screened fine materials are sent into the second bin, the screened coarse materials return to the front half bin of the small bin, and a material forging separating device composed of a forward rotation angle lining plate and a small calculating hole calculating plate is installed at an outlet of the rear bin, wherein the forward rotation angle lining plate is formed by additionally arranging a protruding stop strip on a common lining plate and used for blocking a grinding body which is abraded into small iron slag to block a calculating hole. In addition, the first bin adopts large-ball-diameter steel balls, the second bin adopts large-forging-diameter steel forging, and the tail bin adopts small-forging-diameter steel forging, so that the primary open-flow tube mill achieves obvious high-fineness grinding effect and good economic benefit through the transformation work of the three aspects. In special cases, a powder selecting machine can be matched to achieve a finer grinding effect.

The invention is proved to be most advanced in technical and economic indexes among various types of high-fine grinding equipment through tests of three stages of small size, medium size, large size and the like, and the unit power consumption of a main machine is lower than that of a vibration mill and a grinding system with a series flow type high-fine powder concentrator. Meanwhile, the invention also has the advantages of less auxiliary equipment, simple flow, small investment, long running period, simple and convenient operation, convenient reconstruction of old mills and the like due to the adoption of the open-flow process. For the ground portland cement, the specific surface area can reach 5500cm²More than one gram, the specific surface area of the ground fly ash clinker-free cement can reach 7000 to 8000cm²The water-based cement admixture meets the requirements of producing high-strength, quick-hardening and ultrahigh-strength cement. In addition, the invention is also simpler than the Combidan (Combidan) mill produced by the Denmark Smith company and used for high fine grinding, is convenient to popularize and apply, and is especially suitable for the improvement of the mill of the old factory.

The invention has good technical and economic effects when producing high-fine cement or other high-fine products, can also improve the machine hour output and reduce the unit power consumption of the main machine and the actual power consumption of the grinder when producing the cement or other products with common fineness.

The preferred embodiments of the present invention can be described with reference to the following drawings.

FIG. 1 is a schematic structural diagram of the novel high fine tube mill of the present invention.

FIG. 2 is a schematic view of an overflow partition plate used for connecting the small bin and the first bin according to the present invention.

Figure 3 is a schematic view of a overflow-type computing pad used in the pod of the present invention.

Fig. 4 is a schematic perspective view of a double-deck curved screen used in the silo of the present invention.

Fig. 5 is a perspective view of a forward rotary angle liner used at the exit of the tail bin of the present invention.

Referring to fig. 1, in a primary open-flow multi-bin tube mill barrel 1, a small bin serving as a material ball separating device is arranged between a first bin and a second bin, the small bin is connected with the first bin through an overflow type bin partition plate 2, and the small bin is connected with the second bin through a hole-opening blind plate 5. Inside the small bin, it is divided into front and rear half bins using an overflow type of computing plate 3. The front half cabin of the small cabin is provided with a small ball diameter steel ball, and the rear half cabin of the small cabin is provided with a plurality of double-layer arc-shaped separating sieves 4. A round cylinder 6 is fixed at the position of the rear half cabin of the small cabin close to the axis of the mill by utilizing an overflow type calculating plate 3 and an opening blind plate 5, and a ventilation calculating plate 7 is arranged in the round cylinder 6 close to the second cabin and vertical to the axis direction of the mill. Wherein: the structure of the overflow type partition plate 2 is shown in figure 2, and the common partition plate is not provided with holes on an annular ring close to a mill cylinder, and the width of the holes is determined according to the performance of ground materials and the fineness requirement of products, and is generally 20 to 40 percent of the effective radius of the mill. The function of the overflow type cabin plate is to improve grinding efficiency, prevent the material ball ratio of the first cabin from reducing along with the improvement of the specific surface area of the ground material, enable the output not to be influenced, meanwhile, the cabin plate can also protect the calculation hole of the overflow type calculation plate 3 from being deformed by the impact abrasion of a large steel ball, the structure of the overflow type calculation plate 3 is shown in figure 3, the structure of the overflow type calculation plate 3 is basically the same as that of the overflow type cabin plate 2, the opening radius and the opening mode determined only according to the performance of the ground material and the fineness requirement of the product are different, and the width of the overflow type calculation plate 3 without the calculation hole is generally 15 to 25 percent of the effective radius of the grinding machine. The structure of the perforated blind plate 5 is basically the same as that of a common blind plate, only a plurality of holes are formed at the position close to the center, the holes are used as central discharge openings of the blind plate and are connected with fine material outlets of the double-layer arc-shaped separation sieve 4, and the number of the holes is the same as that of the double-layer arc-shaped separation sieve 4. The schematic perspective structure of the double-layer arc-shaped separating screen 4 is shown in fig. 4, and the separating screen is of a double-layer structure, the upper layer is a separating screen, the lower layer is a separating plate, and the separating screen screens materials entering the rear half cabin of the small cabin from the overflow type calculating plate 3. The fine material falls through the counting holes on the screen onto the lower layer of the separating plate and then flows into the second bin through the central discharge opening on the perforated blind plate 5, while the coarse material on the screen rolls back to the central discharge opening (not shown in fig. 1, see fig. 3) on the overflow counting plate 3 and returns to the front half bin of the small bin. The arc curve of the separating screen is verified by theory and experiment, the Archimedes spiral curve and the hyperbolic curve are good, other curves close to the Archimedes spiral curve and the hyperbolic curve have the same effect, the calculated hole width on the separating screen has the fluctuation range of 1.8 mm to 0.5 mm and the flow area of 25 percent to 35 percent according to the performance of the ground material and the fineness requirement of the product. In addition, the number of the double-layer arc-shaped separating screen is determined according to the specific situation, and the double-layer arc-shaped separating screen can be more or less, and the double-layer arc-shaped separating screen can be connected with the grinding machine and can be fixed on the circular cylinder 6 by using common welding, flange connection and other methods, so that the double-layer arc-shaped separating screen can rotate along with the grinding machine. The first half of the small bin is filled with small-ball-diameter steel balls, so that the small-size calculating holes of the overflow calculating plate 3 can be protected from being easily deformed due to impact of a grinding body, the small steel balls formed by abrasion of the large steel balls in the first bin can be effectively utilized, and cost reduction is facilitated.

The material forging separation device at the outlet of the tail bin consists of an outlet calculating plate 9 and a circle of forward turning angle lining plates 8 which are close to the outlet calculating plate 9. The perspective view of the forward rotation angle lining board 8 is shown in fig. 5, which is that a convex barrier strip is added on the common lining board. In the rotation process of the mill, the protruding barrier strips on the forward rotation angle lining plate can push the small iron slag abraded by the small steel forging to the upstream of the mill, so that the small iron slag cannot be close to the outlet counting plate 9, the problem of counting hole blockage caused by the fact that the small iron slag enters the small counting hole of the outlet counting plate 9 is solved, the small counting hole of the outlet counting plate 9 is guaranteed to be applicable, and the purpose of material forging separation is achieved. In addition, the rotation angle of the forward rotation angle lining plate is between 30 degrees and 50 degrees according to the performance of ground materials and the fineness requirement of products.

Finally, to achieve high-fineness grinding, the use of the grinding body also occupies an important position, and the invention successfully solves the grading problem of the grinding body by matching a large-ball-diameter steel ball in the first bin, matching a large-forging-diameter steel forging in the second bin, matching a small-forging-diameter steel forging in the tail bin and using a small-ball-diameter steel ball in the first half of the small bin, thereby realizing the purpose of high-fineness grinding under the condition of primary open flow.

Claims

1. A high-fine tube mill, consisting of a mill cylinder 1, a feed end, a discharge end, etc.; a small bin is arranged between the first and second bins, the small bin is connected to the first bin using a partition plate, and the small bin is connected to the second bin using a blind plate, an overflow-type middle partition is used inside the small bin to separate the small bin into two half bins, front and back, and a circular cylinder 6 is installed near the axis of the mill in the rear half of the small bin, on which a ventilation grate plate 7 is installed, and the tail of the mill is the discharge end, which is characterized in that the partition plate used to connect the small bin with the first bin is an overflow-type partition plate 2, the blind plate used to connect the small bin with the second bin is an open-hole blind plate 5, the partition plate used in the middle of the small bin is an overflow-type counting plate 3, and in the front half of the small bin, small-diameter steel balls are used as grinding bodies, and a double-layer arc-shaped separation screen 4 is installed in the rear half of the small bin, and the upper layer of the double-layer arc-shaped separation screen 4 is a separation The lower layer is a separation plate. The material entering the back half of the small bin through the overflow counting plate 3 is screened by the separation screen. The coarse material returns to the front half of the small bin through the interface between the separation screen and the overflow counting plate 3, and the fine material falls onto the separation plate and enters the second bin through the interface between the separation plate and the open blind plate 5. In addition, the double-layer arc separation screen 4 is fixed on the circular cylinder 6 using conventional welding and flange connections. At the outlet of the tail bin, a material forging separation device consisting of an outlet counting plate 9 with small counting holes and a circle of forward-rotating angle lining plates 8 close to the outlet counting plate 9 is installed. The forward-rotating angle lining plate 8 is a raised baffle added to the ordinary liner. The baffle prevents small iron slag formed by wear of the grinding body from clogging the small counting holes of the outlet counting plate 9. Moreover, large-diameter steel balls are used in the first bin, large-forging diameter steel forgings are used in the second bin, and small-forging diameter steel forgings are used in the tail bin.

2. The tube mill according to claim 1, wherein the arc curve of the double-layer arc-shaped separation screen 4 is preferably an Archimedean spiral or a hyperbola, and other curves close to these two curves can also be used.

3. The tube mill according to claim 1, wherein the calculated hole width of the double-layer arc-shaped separation screen 4 is between 1.8 mm and 0.5 mm.

4. The tube mill according to claim 1, wherein the width of the overflow partition plate 2 without openings is 20% to 40% of the effective radius of the mill.

5. The tube mill according to claim 1, wherein the width of the unopened holes on the overflow type counter plate 3 is 15% to 25% of the effective radius of the mill.

6. The tube mill according to claim 1, wherein the rotation angle of the forward rotation liner at the tail chamber outlet is 30° to 50°.