Cement combined grinding and semi-finished grinding system capable of being mutually switched

Abstract

The invention discloses a cement combined grinding and semi-finished grinding system capable of being mutually switched, and relates to the technical field of cement production equipment, the cement combined grinding and semi-finished grinding system comprises a roller press system, a cement grinding system and a material distribution mechanism, the roller press system comprises a roller press, a grinding elevator, a V-shaped powder concentrator and a steady flow bin, the cement grinding mill system comprises a cement grinding mill, an out-of-mill elevator, an OSepa powder concentrator, a 128 dust collector and a first air conveying chute, raw materials are conveyed to the in-mill elevator through a warehouse bottom belt and then conveyed to the V-shaped powder concentrator to be pre-sorted, fine powder enters a double-cyclone cylinder to be collected, and the fine powder is guided to the cement grinding mill in a combined grinding mode or directly conveyed to the OSepa powder concentrator in a semi-finished grinding mode through a material distribution mechanism; and the coarse powder returns to the steady flow bin and is extruded by the roller press until material cakes are formed, and then cyclic sorting is performed again. In the whole process, material path switching is achieved through the material distributing mechanism, and free switching between combined grinding (full-feeding grinding) and semi-final grinding (directly feeding fine powder to a final powder selecting machine) can be achieved without additionally arranging a powder selecting machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cement production equipment. BACKGROUND

[0002] The grinding (milling) in cement production is one of the core links of the cement manufacturing process, and the purpose is to grind the raw materials (raw meal) or clinker into fine powder to meet the requirements of subsequent chemical reactions or final product performance. The whole process has a significant impact on the quality of cement, energy consumption and production efficiency. Grinding accounts for 60-70% of the total energy consumption of cement production, and optimizing equipment (such as vertical mill and roller press) is the key to carbon reduction. At present, the double-closed-circuit combined grinding system composed of roller press and cement ball mill is widely used in the cement industry, and its production system has the disadvantages of over-grinding, high energy consumption, and low cement grinding efficiency.

[0003] Many domestic manufacturers upgrade and transform this double-closed-circuit combined grinding process system, but the commonly used scheme is to add a three-separation powder separator that can screen finished materials to the roller press system, and the upgrade and transformation also need to upgrade the auxiliary conveying equipment and the power of the circulating fan, which involves a large amount of transformation work, high investment, and a complex implementation process. SUMMARY

[0004] The purpose of the present application is to solve the above technical problems, and the present application provides a cement combined grinding and semi-finish grinding system that can be switched with each other.

[0005] In order to achieve the above purpose, the present application specifically adopts the following technical scheme:

[0006] A cement combined grinding and semi-finish grinding system that can be switched with each other, comprising a roller press system, a cement mill system and a material distribution mechanism;

[0007] The roller press system comprises a roller press, a mill inlet elevator, a V-type powder separator, and a flow stabilizing bin, wherein the raw material bin bottom conveying belt machine, the mill inlet elevator and the V-type powder separator are connected in sequence, the V-type powder separator fine powder output end is connected with double cyclone, the V-type powder separator coarse powder output end is connected with the flow stabilizing bin, the flow stabilizing bin output end is connected with the roller press, the roller press output end is connected with the raw material bin bottom conveying belt machine and the mill inlet elevator, and the double cyclone output end is connected with the material distribution mechanism;

[0008] The cement mill system comprises a cement mill, a mill outlet elevator, an OSepa powder separator, a 128 dust collector, and a first air conveying chute, wherein the material distribution mechanism is connected with the input end of the cement mill, the output end of the cement mill is connected with the mill outlet elevator, the output end of the mill outlet elevator is connected with the OSepa powder separator, the fine powder output end of the OSepa powder separator is connected with the 128 dust collector for collecting and inputting into the finished cement bin, and the coarse powder output end of the OSepa powder separator is connected with the first air conveying chute and input into the cement mill.

[0009] Through the above scheme, the cement raw material is fed into the V-type powder separator through the bottom conveying belt of the raw material warehouse, the inlet mill elevator, and the V-type powder separator. After being sorted by the V-type powder separator, part of the fine powder enters the double cyclone, and part of the coarse powder enters the steady flow bin. The material in the steady flow bin is extruded and ground by the roller press, and then fed into the V-type powder separator through the inlet mill elevator. This cycle is repeated in the roller press system for extrusion, grinding, and sorting. The material entering the double cyclone is switched and transported by the distribution mechanism, which is equivalent to entering the cement semi-finish grinding system. The material is transported to the outlet mill elevator through the first air conveying chute, and then fed into the OSepa powder separator for sorting. Part of the qualified fine powder is collected by the 128 dust collector and enters the finished cement warehouse. Part of the unqualified coarse powder is transported into the cement mill through the first air conveying chute for grinding. The ground material is fed into the OSepa powder separator through the outlet mill elevator for sorting. This cycle is repeated in the cement mill system for grinding and sorting. The material entering the double cyclone is switched and transported by the distribution mechanism, which is equivalent to entering the cement combined grinding system. The material in the A outlet channel is directly fed into the cement mill for grinding. The ground material is fed into the OSepa powder separator through the outlet mill elevator for sorting. Part of the qualified fine powder is collected by the 128 dust collector and enters the finished cement warehouse. Part of the unqualified coarse powder is transported into the cement mill through the air conveying chute for grinding. This cycle is repeated in the cement mill system for grinding and sorting. The raw material is pre-sorted by the bottom belt of the warehouse, the inlet mill elevator, and the V-type powder separator. The fine powder enters the double cyclone for collection, and the coarse powder returns to the steady flow bin and is extruded by the roller press to form a cake, which is then recycled and sorted. The material at the outlet of the cement mill is sorted again by the outlet mill elevator and the OSepa powder separator. The fine powder becomes finished product, and the coarse powder is returned to the mill for regrinding. The entire process realizes material path switching through the distribution mechanism, without the need for additional powder separators, allowing free conversion between combined grinding (full mill) and semi-finish grinding (fine powder directly sent to the final powder separator). In the semi-finish grinding mode, part of the fine powder bypasses the mill, reducing overgrinding and increasing hourly output.

[0010] Further, the distribution mechanism includes an electric three-way distribution valve arranged at the output end of the double cyclone. The other two ends of the electric three-way distribution valve are respectively the A outlet channel and the B outlet channel. The A outlet channel is connected with the cement mill, and the B outlet channel is provided with a fourth air conveying chute and an outlet mill elevator for conveying to the OSepa powder separator.

[0011] Through the above scheme, when the outlet is switched to the B outlet channel through the electric three-way distribution valve, it is equivalent to entering the cement semi-finish grinding system. When the outlet is switched to the outlet channel 19 through the electric three-way distribution valve, it is equivalent to entering the cement combined grinding system. The electric three-way distribution valve realizes material path switching by combining the A outlet channel and the B outlet channel, without the need for additional powder separators, allowing free conversion between combined grinding and semi-finish grinding.

[0012] Further, the upper end of the double cyclone is provided with a second air conveying chute and a grinding head dust collector, and the output end of the dust collector is connected to a finished product bin.

[0013] Through the above scheme, the fine dust escaping during the sorting process is captured by the dust collector and directly enters the finished product bin through the second air conveying chute, so that the fine powder is separated in advance to avoid over-grinding, and the rationality of the finished product particle size is ensured.

[0014] Further, the cement mill is provided with a mill tail dust collector, and the output end of the mill tail dust collector is provided with a third air conveying chute, and the third air conveying chute is connected to a finished product conveying chute.

[0015] Through the above scheme, the fine powder carried by the cement mill tail exhaust gas is captured by the mill tail dust collector and finally flows into the finished product conveying chute through the third air chute, so that the qualified fine powder escaping from the mill tail is recovered, waste is reduced, and emission is reduced.

[0016] Further, a control computer is additionally provided, and the control computer is electrically connected with the electric three-way distribution valve.

[0017] Through the above scheme, the control computer monitors the current, pressure, fineness and other parameters in real time to dynamically adjust the opening degree of the electromagnetic three-way valve, and when the material is easy to grind, the combined grinding is switched back to ensure the fineness, and when the feeding amount is high, the semi-finish grinding is automatically switched to improve the production capacity.

[0018] The beneficial effects of the present application are as follows:

[0019] 1. The raw materials are pre-separated by the V-type powder separator through the bottom belt to the mill elevator, and the fine powder is collected by the double cyclone, guided by the distribution mechanism to the combined grinding mode cement mill or directly sent to the OSepa powder separator of the semi-finish grinding mode; the coarse powder returns to the steady flow bin and is extruded by the roller press to form a cake and then is recycled and separated. The cement mill outlet material is separated by the OSepa powder separator through the elevator for the second time: the fine powder is the finished product, and the coarse powder is returned to the mill for regrinding. The whole process realizes the switching of the material path through the distribution mechanism, and the OSepa powder separator can be freely converted between the combined grinding (full mill) and the semi-finish grinding (fine powder directly sent to the final powder separator), and part of the fine powder bypasses the mill in the semi-finish grinding mode, reducing over-grinding and improving the hourly output;

[0020] 2. The fine powder carried by the cement mill tail exhaust gas is captured by the mill tail dust collector and finally flows into the finished product conveying chute through the third air chute, so that the qualified fine powder escaping from the mill tail is recovered, waste is reduced, and emission is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a system structure schematic diagram of the present application;

[0022] Attached reference numerals: 1. Raw material silo bottom conveyor belt; 2. Mill feed elevator; 3. V-type classifier; 4. Stabilizing silo; 5. Roller press; 6. Double cyclone separator; 7. Electric three-way distribution valve; 8. Fourth air conveying chute; 9. Mill discharge elevator; 10. OSepa classifier; 11. First air conveying chute; 12. Cement mill; 13. Mill head dust collector; 14. Second air conveying chute; 15. 128 dust collector; 16. Mill tail dust collector; 17. Third air conveying chute; 18. Finished product conveying chute; 19. A discharge channel; 20. B discharge channel. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0025] Example 1

[0026] like Figure 1 As shown, this embodiment provides a cement combined grinding and semi-finished grinding system that can be switched between each other, including a roller press system 5, a cement mill system 12, and a material distribution mechanism;

[0027] The roller press 5 system includes roller press 5, mill feed elevator 2, V-type classifier 3, and flow stabilizing bin 4. The raw material silo bottom conveyor belt 1, mill feed elevator 2, and V-type classifier 3 are connected in sequence. The fine powder output end of V-type classifier 3 is connected to double cyclone 6, the coarse powder output end of V-type classifier 3 is connected to flow stabilizing bin 4, the output end of flow stabilizing bin 4 is connected to roller press 5, the output end of roller press 5 is connected to raw material silo bottom conveyor belt 1 and mill feed elevator 2, and the output end of double cyclone 6 is connected to the material distribution mechanism.

[0028] The cement mill 12 system comprises a cement mill 12, a mill discharge elevator 9, an OSepa powder concentrator 10, a 128 dust collector 15, a first air conveying chute 11, a distribution mechanism connected with the input end of the cement mill 12, the output end of the cement mill 12 connected with the mill discharge elevator 9, the output end of the mill discharge elevator 9 connected with the OSepa powder concentrator 10, the fine powder output end of the OSepa powder concentrator 10 connected with the 128 dust collector 15 for collection and input into a finished cement warehouse, and the coarse powder output end of the OSepa powder concentrator 10 connected with the first air conveying chute 11 and input into the cement mill 12;

[0029] The distribution mechanism comprises an electric three-way distribution valve 7 arranged at the output end of the double cyclone 6, the other two ends of the electric three-way distribution valve 7 being an A discharge channel 19 and a B discharge channel 20, respectively, the A discharge channel 19 connected with the cement mill 12, the B discharge channel 20 provided with a fourth air conveying chute 8 and a mill discharge elevator 9 conveying to the OSepa powder concentrator 10, and further provided with a control computer electrically connected with the electric three-way distribution valve 7.

[0030] In order to reduce dust, avoid over-grinding, and reduce waste, referring to Figure 1 , the upper end of the double cyclone 6 is provided with a second air conveying chute 14 and a mill head dust collector 13, the output end of the mill head dust collector 13 connected with a finished product warehouse, the cement mill 12 is provided with a mill tail dust collector 16, the output end of the mill tail dust collector 16 provided with a third air conveying chute 17, and the third air conveying chute 17 connected with a finished product conveying chute 18. The fine dust escaping during the separation process is captured by the dust collector and directly enters the finished product warehouse through the second air conveying chute 14, the fine powder is separated in advance to avoid over-grinding, the rationality of the finished product particle size is ensured, the fine powder carried by the tail exhaust gas of the cement mill 12 is captured by the mill tail dust collector 16 and finally collected into the finished product conveying chute 18 through the third air chute, the qualified fine powder escaping from the mill tail is recovered, waste is reduced, and emissions are reduced.

[0031] Working process: the cement raw materials are fed into the V-type powder concentrator 3 through the bottom conveying belt of the raw material warehouse, the inlet mill elevator 2, and a part of the fine powder is fed into the double cyclone 6 after being separated by the V-type powder concentrator 3, and a part of the coarse powder is fed into the steady flow bin 4, and the material in the steady flow bin 4 is extruded and ground by the roller press 5, and the ground material is fed into the V-type powder concentrator 3 through the inlet mill elevator 2, and the cycle is extruded and ground by the roller press 5 system, and the material in the double cyclone 6 is switched and conveyed by the material distribution mechanism, which is equivalent to entering the cement semi-finished grinding system, and the material is conveyed to the outlet mill elevator 9 through the first air conveying chute 11, and then fed into the OSepa powder concentrator 10 for separation, and a part of the qualified fine powder is collected by the 128 dust collector 15 and enters the finished cement warehouse, and a part of the unqualified coarse powder is fed into the cement mill 12 through the first air conveying chute 11 for grinding, and the ground material is fed into the OSepa powder concentrator 10 through the outlet mill elevator 9 for separation, and the cycle is ground and separated in the cement mill 12 system; the material in the double cyclone 6 is switched and conveyed by the material distribution mechanism, which is equivalent to entering the cement combined grinding system, and the material in the A discharge channel 19 is directly fed into the cement mill 12 for grinding, and the ground material is fed into the OSepa powder concentrator 10 through the outlet mill elevator 9 for separation, and a part of the qualified fine powder is collected by the 128 dust collector 15 and enters the finished cement warehouse, and a part of the unqualified coarse powder is fed into the cement mill 12 through the air conveying chute for grinding, and the cycle is ground and separated in the cement mill 12 system. The raw materials are pre-separated by the bottom belt to the inlet mill elevator 2 to the V-type powder concentrator 3: the fine powder is collected in the double cyclone 6, guided by the material distribution mechanism to the combined grinding mode of the cement mill 12 or directly to the semi-finished grinding mode of the OSepa powder concentrator 10; the coarse powder is returned to the steady flow bin 4 to the roller press 5 to form a cake and then recycled and separated. The material at the outlet of the cement mill 12 is twice-separated by the elevator to the OSepa powder concentrator 10: the fine powder is finished, and the coarse powder is returned to the mill for regrinding. The whole process realizes the switching of the material path by the material distribution mechanism, and the combined grinding (full grinding) and the semi-finished grinding (fine powder directly to the final powder concentrator) can be freely converted without adding a powder concentrator, and part of the fine powder bypasses the mill to reduce overgrinding and improve the hourly output.

[0032] It should be noted that the connection relationship of the components not mentioned in the present application is defaulted to be the prior art, and since it does not involve the invention point and is generally applied in the prior art, the structure connection relationship is not described in detail.

Claims

1. A cement inter-switchable combined grinding and semi-finish grinding system, characterized in that, The roller press (5) system, the cement mill (12) system and the distribution mechanism are included. The roller press (5) system includes a roller press (5), a mill inlet elevator (2), a V-type powder concentrator (3), a steady flow bin (4), the raw material warehouse bottom conveying belt (1), the mill inlet elevator (2) and the V-type powder concentrator (3) are sequentially connected, the V-type powder concentrator (3) is connected with a double cyclone (6) at a fine powder output end, the V-type powder concentrator (3) is connected with the steady flow bin (4) at a coarse powder output end, the steady flow bin (4) is connected with the roller press (5) at an output end, the roller press (5) is connected with the raw material warehouse bottom conveying belt (1) and the mill inlet elevator (2) at an output end, and the double cyclone (6) is connected with the distribution mechanism at an output end. The cement mill (12) system includes a cement mill (12), a mill outlet elevator (9), an OSepa powder concentrator (10), a 128 dust collector (15) and a first air conveying chute (11), the distribution mechanism is connected with an input end of the cement mill (12), the cement mill (12) is connected with the mill outlet elevator (9) at an output end, the mill outlet elevator (9) is connected with the OSepa powder concentrator (10) at an output end, the OSepa powder concentrator (10) is connected with the 128 dust collector (15) at a fine powder output end to collect and input a finished cement warehouse, and the OSepa powder concentrator (10) is connected with the first air conveying chute (11) at a coarse powder output end to input the cement mill (12).

2. A cement inter-changeable combined grinding and semi-finish grinding system as claimed in claim 1, wherein, The distribution mechanism includes an electric three-way distribution valve (7) arranged at an output end of the double cyclone (6), the electric three-way distribution valve (7) has another two ends which are an A discharge channel (19) and a B discharge channel (20), the A discharge channel (19) is connected with the cement mill (12), and the B discharge channel (20) is provided with a fourth air conveying chute (8) and the mill outlet elevator (9) to convey to the OSepa powder concentrator (10).

3. A cement inter-changeable combined grinding and semi-finish grinding system as claimed in claim 1, wherein, A second air conveying chute (14) and a mill head dust collector (13) are arranged at an upper end of the double cyclone (6), and the mill head dust collector (13) is connected with a finished product bin at an output end.

4. A cement inter-changeable combined grinding and semi-finish grinding system as claimed in claim 1, wherein, A mill tail dust collector (16) is arranged on the cement mill (12), a third air conveying chute (17) is arranged at an output end of the mill tail dust collector (16), and the third air conveying chute (17) is connected with a finished product conveying chute (18).

5. A cement inter-changeable combined grinding and semi-finish grinding system as claimed in claim 1, wherein, A control computer is additionally arranged and electrically connected with the electric three-way distribution valve (7).

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