Low-carbon roller press grinding system and working method

Abstract

The invention discloses a low-carbon roller press grinding system and a working method, and belongs to the technical field of material grinding equipment. The system comprises a low-carbon roller press, a V-shaped powder concentrator, a dynamic powder concentrator, a dust collecting device and a grinding bucket elevator, the low-carbon roller press comprises a partition discharging type material stabilizing bin, a material layer stabilizing device and a roller press body. Materials with different particle sizes are stored in a classified mode through the partition discharging type material stabilizing bin, and the materials are fed into the roller press after being compacted and exhausted through the material layer stabilizing device. The roller press adopts an integrated material limiting device to form a closed grinding area; after the ground materials are subjected to powder selection and classification, coarse powder is ground again in a circulating mode, and fine powder is collected as a finished product. The problems of material segregation, roller deviation of the roller press, air vibration and the like of a traditional roller press grinding system are solved, the grinding efficiency and the system stability are remarkably improved, energy consumption and equipment abrasion are reduced, and efficient and low-carbon grinding operation is achieved through the technical means of partitioned material stabilization, forced feeding, closed grinding and the like.

Description

Technical Field

[0001] This invention relates to the field of material grinding equipment technology, specifically to a low-carbon roller press grinding system and its working method. Background Technology

[0002] As a new type of high-efficiency and energy-saving grinding equipment, the roller press is widely used in grinding various materials due to its advantages of high grinding efficiency and low energy consumption. Its working principle involves using two horizontally installed and synchronously rotating extrusion rollers to crush the material under high pressure. Under its own gravity and the friction of the extrusion rollers, the material is forced downwards, subjected to gradually increasing extrusion pressure until it is crushed into a dense cake and discharged. Some of the material reaches the required particle size for the finished product, while micro-cracks form inside the uncrushed particles, improving their grindability.

[0003] However, existing roller press grinding systems still have some technical problems that need to be solved in actual production:

[0004] 1) Material segregation and roller misalignment in roller press: When materials of different particle sizes are mixed and stored in the stabilizing silo, segregation is likely to occur, resulting in uneven thickness of the material entering the roller press along the roller width direction. This causes the roller press to misalign, affecting grinding efficiency, causing uneven wear on the roller surface, shaft tilting and movement, and other problems, thus reducing equipment reliability.

[0005] 2) Challenges in controlling fine powder content: When the fine powder content of the material entering the roller press is high, the material's fluidity increases, making it prone to passing through the roller press without effective compression. This leads to a narrower roller gap, decreased operational stability, and even material collapse. Furthermore, a high fine powder content results in more voids between particles, making it difficult for air to be released quickly during material compaction. This can easily cause air vibration in the roller press, reducing the reliability of the equipment and civil engineering foundations, and there is a lack of effective control measures.

[0006] 3) Limited roller speed of roller press: When the material pressure comes only from the weight of the material in the bin and the friction between the rollers and the material entering the mill is limited, the roller speed of the roller press is usually limited to below 1.5-1.8 m / s. If the roller speed is further increased, relative sliding will occur between the roller surface and the material, resulting in more wasted work and limiting the improvement of the roller press's processing capacity.

[0007] 4) Side baffle wear and limit failure: Traditional roller presses have fixed side baffles at both ends of the rollers to reduce material escape. However, the moving material causes severe wear on the stationary side baffles, resulting in poor continuity of the limit effect. After the side baffles wear down, material escape from both ends of the rollers increases, the edge effect intensifies, the grinding efficiency decreases, and the side baffles need to be replaced frequently, increasing costs and maintenance workload.

[0008] In summary, existing roller press grinding systems have significant shortcomings in terms of material uniformity, fine powder control, roller speed improvement, and side baffle limiting. These problems severely restrict the further improvement of roller press grinding efficiency and processing capacity, increase equipment maintenance costs and energy consumption, and urgently require an innovative grinding system and working method to solve these problems. Summary of the Invention

[0009] To address the aforementioned technical problems in existing technologies, this invention provides a low-carbon roller press grinding system and its operating method. This system improves the uniformity of particle size distribution and cake stability at various points within the roller press, resolving issues such as material segregation, roller misalignment, and air vibration inherent in traditional roller press grinding systems. Through techniques such as zoned material stabilization, forced feeding, and closed grinding, it significantly improves grinding efficiency and system stability, reduces energy consumption and equipment wear, and achieves highly efficient and low-carbon grinding operations. The use of a bed stabilization device in conjunction with a new low-carbon roller press further reduces the roller press speed, significantly increasing the processing capacity of roller presses of the same specifications.

[0010] One of the objectives of this invention is to provide a low-carbon roller press grinding system, including a low-carbon roller press, a V-shaped classifier, a dynamic classifier, a dust collection device, and a mill outlet bucket elevator;

[0011] The low-carbon roller press includes a partitioned feeding silo, a material layer stabilizing device, and the roller press body; the partitioned feeding silo is used to store materials of different particle sizes in partitions, including a coarse material silo, a medium-coarse powder silo, and a fine powder silo.

[0012] The material stabilizing device is connected to the discharge port of the partitioned material stabilizing silo and is used to compact the mixture, vent air, and regulate the material speed and pressure.

[0013] The roller press body is connected to the discharge end of the material layer stabilizing device, and an integrated material limiting device is provided at its roller gap to form a closed grinding zone;

[0014] The V-shaped classifier is used to receive the raw materials to be ground and the cake after grinding by the roller press, and to break them up and perform preliminary sorting. The coarse powder enters the coarse material stabilizing bin, and the medium and fine powder enters the dynamic classifier.

[0015] The dynamic air classifier is used to further refine the medium and coarse powder separated by the V-shaped air classifier. The qualified fine powder is collected by the dust collection device, and the unqualified material enters the corresponding stable silo.

[0016] The dust collection device is used to collect qualified fine powder separated by the dynamic air classifier and output it as the final product.

[0017] The mill bucket elevator is used to send the pulverized material cake from the roller press and the circulating material from the fine powder silo back to the V-shaped classifier to form a closed-loop circulation.

[0018] As a preferred technical solution, the partitioned material stabilizing silo includes multiple stabilizing silo cylinders arranged side by side. Each stabilizing silo cylinder is provided with an independent inlet and a bottom first material chute. All first material chutes converge to a common discharge port.

[0019] As a preferred technical solution, the first material chute of the fine powder stabilizing silo is equipped with a first gate valve; the bottom of the fine powder stabilizing silo is equipped with a second discharge chute connected to the mill bucket elevator, and a second gate valve is provided on it.

[0020] As a preferred technical solution, the material layer stabilizing device includes two sets of counter-rotating chain conveyor mechanisms to form a gradually changing material channel that is wider at the top and narrower at the bottom, and the bottom width of the channel is adjusted by hydraulic drive.

[0021] As a preferred technical solution, each chain conveyor mechanism includes an upper sprocket group and a lower sprocket group; the upper sprocket group consists of two driven sprockets and a driven sprocket shaft, while the lower sprocket group consists of two driving sprockets and a driving sprocket shaft, with a drive motor provided on one side of the driving sprocket shaft; a matching chain plate assembly is provided between the driven sprockets and driving sprockets of each chain conveyor mechanism, and the front and rear sides of the chain plate assembly mesh with the meshing teeth of the driving and driven sprockets.

[0022] As a preferred technical solution, the chain plate assembly adopts a sleeve-type hinge structure, specifically including multiple columnar male chain bodies arranged at equal intervals and parallel to the driving / driven shaft, and also including a cylindrical female chain body that is sleeved and cooperated with the adjacent male chain body; the two ends of the male chain body are provided with meshing bodies that cooperate with meshing teeth; and a pressure tooth plate facing the material channel is fixed on the outside of the female chain body.

[0023] As a preferred technical solution, the integrated material limiting device includes side baffles and bosses fixed to both ends of the extrusion rollers of the roller press body. The side baffles and bosses are located on the same side of the extrusion rollers and rotate synchronously with the extrusion rollers, forming a nearly enclosed grinding space between the roller gaps of the two rollers.

[0024] As a preferred technical solution, the side baffle is a disc-shaped structure with a diameter larger than that of the extrusion roller, and its edge extends towards the location of the boss. The boss is also disc-shaped and its diameter is smaller than that of the extrusion roller. The outer edge of the side baffle and the outer edge of the boss form a clearance fit, and the gap between the two is directly opposite the end face of the extrusion roller.

[0025] This invention also discloses a working method for a low-carbon roller press grinding system, comprising the following steps:

[0026] S1. The raw material to be ground and the cake after grinding by the roller press enter the V-shaped classifier for dispersion and separation. The coarse powder enters the coarse material stabilizing bin, and the medium and coarse powder enters the dynamic classifier.

[0027] S2. The dynamic classifier sorts qualified fine powder as finished product, while unqualified materials are sent to medium and coarse powder stabilizing bins and fine powder stabilizing bins according to their particle size.

[0028] S3. After the materials from each stabilizing bin converge at the discharge port, they enter the material stabilizing device, are compacted and vented, and then forcibly fed into the roller press.

[0029] S4. The powder cake after grinding by the roller press body and the overflow fine powder from the second material chute of the fine powder stabilizing silo are returned to the V-shaped powder classifier via the mill bucket elevator.

[0030] As a preferred technical solution, the low-carbon roller press includes a control system. When the control system adopts a constant pressure control mode, it sets the roller gap working range a to b. When the real-time detection shows that the roller gap is less than the set lower limit a, the system increases the material quantity and pressure by increasing the feeding speed and increasing the discharge port width, thus causing the roller gap to widen. Conversely, when the roller gap exceeds the upper limit b, the system reduces the material quantity to bring the roller gap back to the normal range; and / or,

[0031] The control system adopts a constant roller gap control mode, with the roller pressure value c to d as the control benchmark: when the roller pressure is lower than the lower limit c, the system increases the material amount of the roller press body by increasing the feeding speed and increasing the discharge port width, so as to promote the roller pressure to rise; when the pressure exceeds the upper limit d, the system reduces the material amount to bring the roller pressure back to the normal range.

[0032] The present invention has the following advantages and beneficial effects:

[0033] The grinding system and method of the present invention optimizes material flowability and grinding efficiency through the synergistic effect of various components: the closed-loop circulation system combines the precise sorting of V-shaped classifier and dynamic classifier, the coarse powder is recycled for re-grinding, and the fine powder is collected efficiently, forming an efficient closed-loop grinding process, reducing energy consumption and the proportion of repeated grinding, and further improving the overall grinding efficiency.

[0034] In particular, the low-carbon roller press performs exceptionally well in terms of stability and efficiency.

[0035] 1. The partitioned feeding silo stores materials of different particle sizes (coarse, medium-coarse powder, and fine powder) separately and discharges them through independent material chutes. This completely solves the problem of uneven rollers caused by material segregation in traditional systems, ensuring uniform feeding of the roller press, balanced force on the roller surface, and avoiding shaft tilting and uneven wear of the roller surface.

[0036] The material stabilization device forms a gradually narrowing material channel through a chain conveyor mechanism that rotates in opposite directions. Combined with hydraulic drive adjustment, it compacts and vents the material, effectively preventing air vibration phenomena under high fine powder content and further enhancing the stability of system operation.

[0037] The integrated material limiting device uses the dynamic cooperation of rotating side baffles and fixed bosses to form a nearly closed grinding zone at the roller gap, which greatly reduces material escape from the edge, reduces the edge effect, makes the material bed more stable, and at the same time reduces the wear of the side baffles and extends the service life of the equipment.

[0038] 2. The forced feeding design applies an active feeding force to the material through the pressure toothed plate of the material bed stabilization device. Combined with the friction force of the roller surface, this significantly improves the material feeding speed, enabling the roller press to operate stably at higher speeds. This invention achieves higher speeds by optimizing feeding and material bed control, thereby greatly improving processing capacity.

[0039] The intelligent control system supports two modes: constant roller gap and constant pressure. By adjusting the feed rate and roller pressure parameters in real time, it ensures that the equipment is always in the best working condition, which not only improves grinding efficiency but also reduces energy consumption per unit output, achieving the goal of high efficiency and low carbon emissions.

[0040] In summary, this invention not only solves the stability problems of traditional systems such as roller misalignment and air vibration, but also achieves a breakthrough in grinding efficiency through increased rotational speed and efficient sorting, providing the industry with a grinding solution with high output, low energy consumption, and long service life. Attached Figure Description

[0041] Figure 1 This is a process flow diagram of the low-carbon roller press grinding system of the present invention;

[0042] Figure 2 This is a schematic diagram of the overall structure of the low-carbon roller press of the present invention;

[0043] Figure 3 This is a schematic diagram of the partitioned feeding silo structure of the present invention;

[0044] Figure 4 This is a schematic diagram of the material layer stabilization device of the present invention;

[0045] Figure 5 for Figure 3 Side view;

[0046] Figure 6 This is a schematic diagram of the active sprocket structure of the material layer stabilization device of the present invention;

[0047] Figure 7 This is a schematic diagram of the chain plate assembly structure of the material layer stabilization device of the present invention;

[0048] Figure 8 This is a diagram illustrating the constant roll gap / constant pressure control strategy for the roller press of the present invention.

[0049] Figure 9 This is a schematic diagram of the extrusion roller structure of the roller press body of the present invention;

[0050] Figure 10 for Figure 9 Top view.

[0051] In the picture:

[0052] 1. Zoned feeding silo; 11. Coarse material silo; 12. Medium-coarse powder silo; 13. Fine powder silo; 14. First material chute; 15. First gate valve; 16. Second material chute; 17. Second gate valve; 18. Discharge port; 2. Material layer stabilizing device; 21. Drive sprocket; 22. Driven sprocket; 23. Hydraulic push rod; 24. Drive motor; 25. Chain plate assembly; 251. Male chain body; 252. Female chain body; 253. Pressure toothed plate; 254. Toothed plate support; 3. Roller press body; 31. Extrusion roller; 32. Side baffle; 33. Boss; 4. V-shaped classifier; 5. Dynamic classifier; 61. Cyclone dust collector; 62. Bag dust collector; 7. Mill bucket elevator. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0054] Example 1

[0055] like Figure 1 As shown, this embodiment provides a low-carbon roller press grinding system, which includes a low-carbon roller press, a V-shaped classifier 4, a dynamic classifier 5, a dust collection device, and a mill bucket elevator 7; the equipment works together to achieve efficient grinding and low-carbon operation.

[0056] The low-carbon roller press includes a partitioned feeding silo 1, a material layer stabilizing device 2, and a roller press body 3; the partitioned feeding silo is used to store materials of different particle sizes in partitions, including a coarse material silo, a medium-coarse powder silo, and a fine powder silo.

[0057] The partitioned feeding silo 1 is used to classify and store materials of different particle sizes, including a coarse material silo 11, a medium-coarse powder silo 12, and a fine powder silo 13, ensuring that materials are supplied on demand. The material layer stabilization device 2 compacts, vents, and regulates the material speed and pressure of the mixture from the partitioned feeding silo 1, and stably feeds it into the roller press body. The roller press body 3 is the core grinding equipment, with an integrated material limiting device at the roller gap, forming a nearly closed grinding zone, forcing the material through the roller gap for efficient grinding. The V-shaped classifier 4 is used to break up the material cake and... Preliminary sorting separates coarse powder from medium and fine powder. The coarse powder enters the material stabilization device 2, while the medium and fine powder enters the dynamic classifier 5. The dynamic classifier 5 further refines the medium and coarse powder separated by the V-shaped classifier 4 to ensure that the particle size of the finished product meets the standards. The dust collection device includes a cyclone dust collector 61 and a bag dust collector 62: it collects the qualified fine powder separated by the dynamic classifier 5 as the final product output. The mill bucket elevator 7 is used to lift the circulating material from the roller press body 3 and the fine powder stabilization silo 13 and return it to the V-shaped classifier 4 for reprocessing, forming a closed-loop cycle.

[0058] The working method of the low-carbon roller press grinding system is as follows:

[0059] S1. Initial feeding and pre-sorting:

[0060] After the raw material is mixed with the powder cake ground by the roller press body 3, it enters the V-shaped classifier 4 from the top, where it is broken up and initially sorted.

[0061] The separated coarse powder enters the coarse material stabilizing silo 11, while the medium and coarse powder is drawn by the blower to the dynamic powder classifier 5.

[0062] S2. Dynamic powder selection and finished product collection:

[0063] The dynamic air classifier further separates the medium and coarse powders into five pairs. The qualified fine powder is collected by the dust collection device as the finished product, while the unqualified medium and coarse powders and fine powders are respectively sent to the corresponding medium and coarse powder stabilizing bin 12 or fine powder stabilizing bin 13.

[0064] S3. Stable feed bin consolidation and forced feeding:

[0065] After the materials in each stabilizing bin are mixed through the discharge port 18, they enter the material stabilizing device 2. After being compacted and vented, they are fed into the roller gap of the roller press body 3 for grinding.

[0066] S4. Grinding and Circulation:

[0067] The powder cake after grinding by the roller press body 3, together with the excess fine powder in the fine powder silo 13, is lifted by the mill bucket elevator 7 and sent back to the V-shaped classifier 4 to form a closed loop and improve grinding efficiency.

[0068] S5. Confined and Closed Grinding:

[0069] An integrated material limiting device is installed at the roller gap of the roller press body 3 to ensure that the material is fully compressed in the closed grinding zone, avoid material leakage, and improve the grinding effect.

[0070] In this embodiment, the V-shaped classifier 4, the dynamic classifier 5, and the dust collection device are all existing technologies, and their specific structures and working principles will not be described in detail.

[0071] In this embodiment, the partitioned feeding silo 1 ensures material uniformity, the material bed stabilization device 2 optimizes the material bed structure, the roller press body 3 operates stably at high speed, and the dynamic powder classifier 5 precisely controls the quality of the finished product, forming a positive cycle.

[0072] Example 2

[0073] like Figure 2 , 3 As shown in the figure, this embodiment discloses the specific structure of the partitioned feeding silo 1, including a coarse material silo 11, a medium-coarse powder silo 12 and a fine powder silo 13 arranged side by side, for partitioned storage of materials with different particle size compositions, and each silo cylinder is provided with an independent feed port above it;

[0074] Each material silo is connected to an independent material chute 14 at its bottom, and all material chutes 14 converge at their bottoms to a common discharge port 18. Downstream of the discharge port 18 is a material stabilizing device 2 to compact and pre-treat the converged material before conveying it to the roller press body 3. In this technical solution, because materials of different particle sizes are stored in separate zones, the particle size distribution in each zone is relatively narrow, and the particle size is more concentrated, effectively reducing material segregation. In contrast, the traditional method of mixing materials from different parts into a stabilizing silo results in a relatively wide particle size distribution within the silo. When the particle size difference within the silo is large, the greater the difference in their relative sliding tendency, the more prone segregation becomes.

[0075] Each material silo has an independent material chute 14 at its bottom, and each material silo cylinder has a first material chute 14 at its bottom. The outlets of all material chutes 14 converge at a common discharge port 18. The material discharged from the discharge port 18 is compacted by the material layer stabilizing device 2 and then enters the roller press body 3. Preferably, in order to control the total feed rate of the roller press body 3, the material chute 14 of the fine powder material silo 13 is equipped with a first baffle valve 15 to control the fine powder discharge rate. In addition, the bottom of the fine powder material silo 13 is also equipped with a second discharge chute 16 connected to the mill bucket elevator. The second discharge chute 16 is equipped with a second baffle valve 17 to prevent excess fine powder from entering the material layer stabilizing device 2.

[0076] During operation, the proportion of fine-grained material in the material to be ground can be flexibly adjusted by controlling the first gate valve 15 and the second gate valve 17 according to the operating status of the roller press body 3, so as to adapt to the different operating requirements of the roller press body 3. When the roller gap of the roller press body 3 fluctuates greatly, or the material has good flowability, the roller press body 3 passes through for a short time, and the roller gap suddenly decreases, some fine-grained material can be transported to the V-shaped classifier 4 through the outlet bucket elevator. This reduces the fine powder content in the material to be ground in a short time. The sorting by the V-shaped classifier 4 also reduces the amount of fine-grained material returning to the stabilization bin. After the roller press body 3 runs smoothly, the bypass amount of fine-grained material can be gradually reduced by controlling the second gate valve 17. This method is beneficial for stabilizing and controlling the working status of the roller press body 3 and improving the grinding efficiency of the roller press body 3.

[0077] Example 3

[0078] like Figures 4-7 As shown in the figure, this embodiment discloses in detail the specific structure of the material layer stabilization device 2 to solve the air vibration problem during the grinding process of materials with high fine powder content. Specifically, the device includes two sets of chain plate conveying mechanisms arranged parallel to and rotating in opposite directions with the rollers of the roller press body 3. A gradually narrowing material channel with a wider top and narrower bottom is formed between the two sets of chain plate conveying mechanisms. This gradually narrowing channel design can realize the natural aggregation and pre-compression of materials, creating favorable conditions for subsequent compaction. The material to be ground falls along the channel under the action of gravity, forming a high-density aggregation in the bottom area of ​​the channel. At the same time, the width of the bottom of the channel is dynamically adjustable through hydraulic drive, realizing the staged compression of materials and effectively preventing air vibration.

[0079] Each chain conveyor mechanism adopts a modular design, including an upper sprocket assembly and a lower sprocket assembly. The upper sprocket assembly consists of two driven sprockets 22 and a driven sprocket shaft, while the lower sprocket assembly consists of two driving sprockets 21 and a driving sprocket shaft. The driving and driven sprockets adopt a standardized design with meshing teeth in the circumference. A matching chain plate assembly 25 is provided between the driven sprockets 22 and the driving sprockets 21 of each chain conveyor mechanism. The front and rear sides of the chain plate assembly 25 mesh with the meshing teeth of the driving and driven sprockets. A drive motor 24 is provided on one side of the driving sprocket shaft, so that the driving sprocket shaft drives the driving sprockets 21 to rotate in opposite directions, and then the chain plate assembly 25 drives the driven sprockets 22 to rotate in opposite directions. Under the combined action of gravity and the chain plate assembly 25, the material gathers at the bottom of the material channel and is compacted.

[0080] Furthermore, the chain plate assembly 25 adopts a sleeve-type hinge structure, specifically including multiple columnar male chain bodies 251 arranged equidistantly and parallel to the main / driven shaft, and a cylindrical female chain body 252 that is sleeved and fitted with adjacent male chain bodies 251; the two ends of the male chain bodies 251 are provided with meshing bodies that engage with meshing teeth; all male chain bodies 251 and female chain bodies 252 cooperate to form a rotating body driven by the main and driven sprockets; a pressure toothed plate 253 facing the material channel is fixed on the outside of the female chain body 252 to form a forced feeding effect, and a toothed plate support 254 is provided between the pressure toothed plate 253 and the female chain body 252. The setting of the pressure toothed plate 253 greatly improves the feeding speed and realizes forced feeding of the roller press body 3.

[0081] Furthermore, the hydraulic drive structure consists of a pair of hydraulic push rods 23, which are respectively mounted on the drive sprocket shafts outside the two drive sprockets 21, and the axial direction of the hydraulic push rods 23 is perpendicular to the axial direction of the drive sprocket shafts. Thus, the hydraulic push rods 23 of the two chain conveyor mechanisms push against each other, causing the distance between the two drive sprocket shafts to gradually decrease.

[0082] The low-carbon roller press also includes a roller press control system. By setting the stroke of the hydraulic push rod 23 and the speed of the drive motor 24, the amount of material entering the roller gap of the lower roller press body 3 can be controlled, and the constant pressure or constant roller gap of the roller press body 3 can be automatically controlled.

[0083] Specifically, such as Figure 8 As shown, the roller press control system provides two intelligent control modes: constant roller gap and constant pressure, and ensures the stability of the grinding process through closed-loop regulation.

[0084] When the control system adopts constant pressure control mode, the working range of the roller gap is set from a to b. When the real-time detection shows that the roller gap is less than the set lower limit a, the system increases the material quantity and pressure by increasing the feeding speed and increasing the discharge port width, so as to make the roller gap larger. Conversely, when the roller gap exceeds the upper limit b, the system reduces the material quantity to make the roller gap return to the normal range.

[0085] When the control system adopts the constant roll gap control mode, the roll pressure value c to d is used as the control benchmark: when the roll pressure is lower than the lower limit c, the system increases the material amount of the roll press body by increasing the feeding speed and increasing the discharge port width, so as to promote the roll pressure to rise; when the pressure exceeds the upper limit d, the system reduces the material amount to make the roll pressure return to the normal range.

[0086] Both modes employ a real-time data feedback mechanism, dynamically coordinating the operating parameters of the feeding and pressure systems to achieve adaptive control of the grinding process. This control system not only effectively maintains the stability of process parameters but also automatically optimizes the operating state based on material characteristics, ensuring the equipment always operates within its optimal range, significantly improving grinding efficiency and reducing energy consumption.

[0087] Example 4

[0088] like Figure 9 , 10 As shown in the figure, this embodiment discloses the specific structure of the roller press body 3, including two extrusion rollers 31 that are axially parallel and rotate in opposite directions. Each extrusion roller 31 has an integrated material limiting device on both ends. The integrated material limiting device cooperates with the roller surface to form a nearly closed grinding space between the roller gaps of the two rollers. This can fix the movement range of the material cake in the grinding zone within the closed cavity, effectively improve the problem of material escape at the edge, reduce the edge effect, and improve the stability of the material bed and the grinding efficiency.

[0089] Specifically, the integrated material limiting device includes side baffles 32 and bosses 33 connected to both ends of the extrusion roller 31 shaft by fixing bolts 34. The side baffles 32 and bosses 33 are arranged in pairs on the same side of the extrusion roller 31 to form a cooperative limiting mechanism. The side baffles 32 are disc-shaped structures with a diameter larger than that of the extrusion roller 31, and their edges extend towards the location of the bosses 33. The bosses 33 are also disc-shaped and have a diameter smaller than that of the extrusion roller 31. The outer edge of the side baffles 32 and the outer edge of the bosses 33 form a clearance fit, and the gap between them is aligned with the end face of the extrusion roller 31, rather than aligned with the roller gap. This fit forms an almost completely closed grinding chamber at both ends of the extrusion roller 31 shaft.

[0090] According to the above technical solution, the side baffle 32 rotates synchronously with the extrusion roller 31 and has no relative friction with the fixed boss 33, thus improving the static material limiting to dynamic rotational material limiting and completely eliminating the sliding friction between the baffle and the material in the traditional structure; the closed cavity structure strictly limits the movement of the material cake within the set range, so that the material limiting device can maintain a continuous sealing effect in the rotating state. The unique gap position design avoids the possibility of material leakage from the end face, effectively suppresses the edge effect, and improves the stability of the material bed.

[0091] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention may still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-carbon roller press grinding system, characterized in that, This includes a low-carbon roller press, a V-shaped classifier, a dynamic classifier, a dust collection device, and a mill bucket elevator; The low-carbon roller press includes a partitioned feeding silo, a material layer stabilizing device, and the roller press body; the partitioned feeding silo is used to store materials of different particle sizes in partitions, including a coarse material silo, a medium-coarse powder silo, and a fine powder silo. The material stabilizing device is connected to the discharge port of the partitioned material stabilizing silo and is used to compact, vent, and regulate the material speed and pressure of the mixture before feeding it into the roller press body. The roller press body is connected to the discharge end of the material layer stabilizing device, and an integrated material limiting device is provided at its roller gap to form a nearly completely closed grinding zone. The V-shaped classifier is used to receive the raw materials to be ground and the cake after grinding by the roller press, and to break them up and perform preliminary sorting. The coarse powder enters the coarse material stabilizing bin, and the medium and fine powder enters the dynamic classifier. The dynamic air classifier is used to further refine the medium and coarse powder separated by the V-shaped air classifier. The qualified fine powder is collected by the dust collection device, and the unqualified material enters the corresponding stable silo. The dust collection device is used to collect qualified fine powder separated by the dynamic air classifier and output it as the final product. The mill bucket elevator is used to send the pulverized material cake from the roller press and the circulating material from the fine powder silo back to the V-shaped classifier to form a closed-loop circulation.

2. The low-carbon roller press grinding system according to claim 1, characterized in that, The partitioned material stabilizing silo includes multiple silo cylinders arranged side by side. Each silo cylinder has an independent inlet and a bottom first material chute. All first material chutes converge to a common discharge port.

3. The low-carbon roller press grinding system according to claim 2, characterized in that, The first material chute of the fine powder stabilizing silo is equipped with a first gate valve; the bottom of the fine powder stabilizing silo is equipped with a second discharge chute connected to the mill bucket elevator, which is equipped with a second gate valve.

4. The low-carbon roller press grinding system according to claim 1, characterized in that, The material stabilizing device includes two sets of counter-rotating chain conveyor mechanisms, forming a gradually narrowing material channel that is wider at the top and narrower at the bottom, and the bottom width of the channel is adjusted by hydraulic drive.

5. The low-carbon roller press grinding system according to claim 4, characterized in that, Each chain conveyor mechanism includes an upper sprocket group and a lower sprocket group; the upper sprocket group consists of two driven sprockets and driven sprocket shafts, while the lower sprocket group consists of two driving sprockets and driving sprocket shafts, with a drive motor on one side of the driving sprocket shaft; each chain conveyor mechanism has a matching chain plate assembly between the driven sprockets and driving sprockets, and the front and rear sides of the chain plate assembly mesh with the meshing teeth of the driving and driven sprockets.

6. The low-carbon roller press grinding system according to claim 5, characterized in that, The chain plate assembly adopts a sleeve-type hinge structure, specifically including multiple columnar male chain bodies arranged at equal intervals and parallel to the driving / driven shaft, and a cylindrical female chain body that is sleeved and fitted with adjacent male chain bodies; the two ends of the male chain body are provided with meshing bodies that cooperate with meshing teeth; and a pressure tooth plate facing the material channel is fixed on the outside of the female chain body.

7. The low-carbon roller press grinding system according to claim 1, characterized in that, The integrated material limiting device includes side baffles and bosses fixed to both ends of the extrusion rollers of the roller press body. The side baffles and bosses are located on the same side of the extrusion rollers and rotate synchronously with the extrusion rollers, forming a nearly enclosed grinding space between the roller gaps of the two rollers.

8. The low-carbon roller press grinding system according to claim 7, characterized in that, The side baffle is a disc-shaped structure with a diameter larger than that of the extrusion roller. Its edge extends towards the location of the boss, which is also disc-shaped and has a diameter smaller than that of the extrusion roller. The outer edge of the side baffle and the outer edge of the boss form a clearance fit, and the gap between them is directly opposite the end face of the extrusion roller.

9. The working method of the low-carbon roller press grinding system according to any one of claims 1 to 8, characterized in that, Includes the following steps: S1. The raw material to be ground and the cake after grinding by the roller press enter the V-shaped classifier for dispersion and separation. The coarse powder enters the coarse material stabilizing bin, and the medium and coarse powder enters the dynamic classifier. S2. The dynamic classifier sorts qualified fine powder as finished product, while unqualified materials are sent to medium and coarse powder stabilizing bins and fine powder stabilizing bins according to their particle size. S3. After the materials from each stabilizing bin converge at the discharge port, they enter the material stabilizing device, are compacted and vented, and then forcibly fed into the roller press. S4. The fine powder from the roller press grinding cake and the overflow fine powder from the second material chute of the fine powder stabilizing silo are returned to the V-shaped classifier via the mill bucket elevator.

10. The working method of the low-carbon roller press grinding system according to claim 9, characterized in that, The low-carbon roller press includes a control system. The control system employs a constant pressure control mode and sets the roller gap working range a to b: when real-time detection shows the roller gap is less than the set lower limit a, the system increases the material quantity to increase the roller gap; conversely, when the roller gap exceeds the upper limit b, the system reduces the material quantity to return the roller gap to the normal range; and / or, The control system adopts a constant roll gap control mode, using the roll pressure value c to d as the control benchmark: when the roll pressure is lower than the lower limit c, the system increases the amount of material to raise the roll pressure; when the pressure exceeds the upper limit d, the system reduces the amount of material to bring the roll pressure back to the normal range.

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