Material pre-pressurizing device with automatic deviation correction function, material stabilizing bin and method

Abstract

The present application belongs to the technical field of stable material bin, and particularly relates to a material pre-pressing device with automatic deviation rectifying function, a stable material bin and a method. The material pre-pressing device is arranged between the bottom of the stable material bin and a roller press, and is used for feeding the material from the stable material bin into the roller press after exhausting the material. A box is arranged outside the material pre-pressing device. The box is provided with a feeding inlet communicated with the bin body of the stable material bin. The feeding inlet is located directly above an extrusion channel formed by the pressing roller and the inner wall of the box. The material pre-pressing device comprises a pre-pressing power structure, a pressing roller and a pressing mechanism. The pre-pressing power structure is used for driving the pressing roller to rotate. The pressing mechanism is arranged on the side of the pressing roller away from the feeding inlet, and is used for providing horizontal pressure to the pressing roller towards the inner wall of the box. The pressing roller continuously meshes the material into the extrusion channel formed between the pressing roller and the inner wall of the box under the pressure provided by the pressing mechanism, so as to pre-press the material. The present application effectively prevents the roller press from being subjected to air vibration, and is helpful to improve the effective work of the roller press.

Description

Technical Field

[0001] This patent relates to the field of material silo technology, specifically to a material pre-pressurization device, material silo, and method with automatic deviation correction function. Background Technology

[0002] Roller presses are a type of high-efficiency and energy-saving grinding equipment. They adopt the advanced material layer grinding principle, which can form many micro-cracks inside the un-crushed particles while crushing the material, thereby improving the grindability of the material. Therefore, they are widely used in raw material and cement grinding.

[0003] In the grinding process of raw materials and cement, the materials need to be repeatedly circulated and extruded by a roller press to form the final product. The higher the fineness index of the finished product, the more times the material circulates in the roller press. The circulating material with a high fine powder content is mixed with the new feed and then fed back into the roller press for extrusion. To ensure the continuity and stability of the feeding into the roller press, a stabilizing hopper is usually set up in conjunction with the roller press. In actual production, the particle size distribution of the material discharged from the stabilizing hopper along the width direction of the roller press has a significant impact on the operational stability of the roller press.

[0004] When fresh feed and multiple streams of circulating materials with varying fine powder content enter the stabilizing silo simultaneously without pre-mixing, uneven particle size distribution occurs throughout the silo. This results in inconsistent particle size distribution along the width of the roller press. Because fine materials have better flowability and pass through the roller gap faster, for a given amount of material per unit time, the roller gap width on the fine material side will be smaller than that on the coarse material side, causing roller misalignment. This misalignment problem, caused by uneven particle size distribution in the roller press feed, not only reduces the grinding efficiency of the roller press but also easily leads to uneven roller surface wear, shaft tilting and misalignment, and other problems, affecting the service life of the equipment.

[0005] When the roller gap deviation of a roller press is too large, the industry usually increases the roller pressure on the side with a larger roller gap or decreases the roller pressure on the side with a smaller roller gap to reduce the roller gap deviation. However, this method will result in the material on the side with lower pressure not being fully ground, and the grinding effect will be worse.

[0006] Since the material in the silo is accumulated solely by its own gravity, a large amount of air will exist between the particles. When the roller press squeezes and grinds it, the material volume shrinks rapidly to form a cake. If this gas cannot be discharged in time, it will cause air vibration in the roller press, affecting the stable and effective work of the roller press. In severe cases, it can also damage the foundation of the roller press. Especially when the material contains more fine particles, the gas is less likely to be discharged, and the probability of air vibration is greater.

[0007] Patent CN115007269B discloses a material adjustment system for a roller press, including a weighing and stabilizing silo, a feeding mechanism, a compaction and venting mechanism, and a feeding box. The compaction and venting mechanism uses the telescopic motion of a hydraulic cylinder to drive a pressure plate to reciprocate around a fixed axis, reciprocatingly compressing the material passing through the pressure plate to expel air from the material, thus pre-pressurizing the material and improving the working efficiency of the roller press. In summary, the problems with the existing technology are:

[0008] (1) When the roller gap deviation of the roller press is large, there is no effective means of adjustment. Adjusting the roller press to eliminate the roller gap deviation will affect the working efficiency of the roller press.

[0009] (2) Before the material enters the roller press, it is piled up by its own gravity. There is a lot of air between the loose particles. If the high pressure gas is applied in time and not removed in time, it will easily cause the roller press to vibrate, affecting the stability of the roller press grinding system.

[0010] (3) The existing technology adopts an intermittent pressurization method. After one pressurization action is completed, the volume of the material channel increases as the pressure plate returns to the initial position. The material that has completed pressurization and degassing will become loose to a certain extent, resulting in poor pre-pressurization effect. Furthermore, when the pressure plate is in the initial position, some material only passes through the pressure plate without being pressurized.

[0011] (4) When the material is pressurized by the existing technology, the reduction in the volume of the material channel will hinder the descent of the material, reduce the material throughput per unit time of the roller press, and affect the production efficiency. Summary of the Invention

[0012] To address the shortcomings of existing technologies, this invention provides a material pre-pressurization device, a material stabilizing bin, and a method with automatic deviation correction function. The intelligent deviation correction control method of the roller gap is used to adjust the distribution of material entering the roller press, effectively avoiding and adjusting the roller deviation phenomenon, ensuring that the roller press works efficiently and stably, extending the service life of the roller press, and reducing equipment maintenance costs.

[0013] This invention is achieved through the following technical solution:

[0014] A material pre-pressurization device with automatic deviation correction function is provided. The material pre-pressurization device is located between the bottom of the material stabilizing silo and the roller press. It is used to squeeze and degas the material from the material stabilizing silo and then feed it into the roller press.

[0015] The material pre-pressurization device has a housing on its outer side; the housing has an inlet that communicates with the material stabilizing hopper with automatic correction function, and the inlet is located directly above the extrusion channel formed by the pressure roller and the inner wall of the housing; the material pre-pressurization device includes a pre-pressurization power structure, a pressure roller, and a pressurization mechanism; the pre-pressurization power structure is used to drive the pressure roller to rotate; the pressurization mechanism is located on the side of the pressure roller away from the inlet, and is used to provide horizontal pressure towards the inner wall of the housing to the pressure roller; under the pressure provided by the pressurization mechanism, the pressure roller continuously bites the material into the extrusion channel formed between the pressure roller and the inner wall of the housing to pre-pressurize the material.

[0016] Furthermore, the pre-pressurization power structure includes a matching pre-pressurization variable frequency motor and a pre-pressurization reducer; the pressurization roller includes a roller sleeve and a roller shaft sleeved together, with both ends of the roller shaft fixed in bearing seats on both sides of the roller sleeve, and the end of the roller shaft near the pre-pressurization variable frequency motor connected to the pre-pressurization reducer, and the pre-pressurization variable frequency motor and the pre-pressurization reducer connected by a universal coupling; the pre-pressurization reducer is connected to the hinged support of the reducer torque support mechanism by a connecting rod.

[0017] Furthermore, the pressurizing mechanism includes an electro-hydraulic actuator perpendicular to the roller shaft, an oil pipe, and an electro-hydraulic actuator hinge support; the electro-hydraulic actuator hinge support is fixed on the bearing housing, one end of the electro-hydraulic actuator is horizontally fixed on the bearing bracket, and the other end is movably connected to the electro-hydraulic actuator hinge support and faces the roller shaft; the oil pipe is threaded to the interface of the pressurizing mechanism; a vertically arranged guide key is connected below the bearing housing, and a guide groove that mates with the guide key is provided on the bearing bracket; the guide key includes a guide rod fixed in the bearing housing and a disc-shaped guide seat fixed at the bottom of the guide rod, and the guide seat moves or rotates linearly or rotates within the guide groove, thereby driving the guide rod and the bearing housing to move or rotate.

[0018] Furthermore, multiple pressure plates are provided on the outer side of the inner wall of the extrusion chamber, and pressure plate supports are provided below the pressure plates.

[0019] Furthermore, the box body is connected to the end of the roller shaft, and a horizontal waist-shaped hole is provided at the connection point. The roller shaft can move or rotate horizontally within the waist-shaped hole, thereby driving the bearing seat and the pressure roller to move or rotate horizontally. A return hole is provided on the box body below the waist-shaped hole, and the material falling out from the waist-shaped hole returns to the material pre-pressurization device through the return hole.

[0020] Furthermore, a limiting plate is provided below the pressure roller, and the bottom of the side away from the pressure mechanism is a vertical limiting plate. The limiting plate extends downward to the discharge port, and a feeding space is formed between the limiting plate and the inner wall of the box and located directly below the extrusion channel. This feeding space is suitable for the size of the pre-pressurized material, and the pre-pressurized material enters the roller press for pressurization through the discharge port.

[0021] Furthermore, the width of the discharge port is greater than the width between the limiting plate and the inner wall of the box.

[0022] Furthermore, a bottom plate is inclinedly provided directly below the pressure roller, and there is a gap between the material limiting plate and the bottom plate. The material passing through the gap between the pressure roller and the two side boxes is mixed with the pre-pressurized material again through the gap and discharged out of the box through the discharge port.

[0023] A material silo includes the aforementioned material pre-pressurization device with automatic deviation correction function.

[0024] This invention also discloses a method for operating the aforementioned material pre-pressurization device with automatic deviation correction function, the steps of which include:

[0025] S1. The material to be ground falls evenly into the horizontal section of the material silo;

[0026] S2. When the material enters the box from the feed port above the pressure roller and comes into contact with the pressure roller, the pressure roller uses the friction between the roller surface and the material to continuously bite the material between the pressure roller and the inner wall of the box, pre-pressurize the material, and expel a large amount of air between the materials.

[0027] S3. The pre-pressurization intensity is adjusted by adjusting the stroke of the electro-hydraulic actuator of the pressurization mechanism, and the material falling speed is adjusted by adjusting the speed of the pre-pressurization variable frequency motor.

[0028] S4. When the roller press material silo is working, the roller press roller gap deviation is calculated in real time using the roller press roller gap online measurement sensor, and the data signal of the deviation is transmitted to the controller. The controller calculates and controls the advance stroke of the electro-hydraulic actuator.

[0029] Furthermore, the material pre-pressurization device has an automatic roller gap correction function: when the roller press stabilizing hopper is working, the roller gap deviation of the roller press is calculated in real time using the roller press online measurement sensor, and the data signal of the deviation is transmitted to the controller. The controller calculates and controls the advancement stroke of the electro-hydraulic actuator.

[0030] Furthermore, when the deviation of the roll gap at both ends of the roller press exceeds the upper limit allowed for normal operation, the electro-hydraulic actuators automatically adjust their respective actuator strokes according to the instructions issued by the controller, forcibly reducing the feed amount of the roller press on the side with a larger roll gap and increasing the feed amount of the roller press on the side with a smaller roll gap. When the roll gap deviation returns to normal, the electro-hydraulic actuators on both sides automatically resume the stroke before adjustment.

[0031] Furthermore, the absolute upper limit of the difference between the left and right roller gaps of the roller press is set to a mm. When the roller gap deviation is less than a, the strokes of the two electro-hydraulic actuators are consistent, with both left and right electro-hydraulic actuators having a stroke of b mm. When the roller gap deviation is greater than a, if the left roller gap of the roller press is greater than the right roller gap, the stroke of the left electro-hydraulic actuator of the pre-pressurization device increases by c mm, and the stroke of the right electro-hydraulic actuator decreases by d mm. If the left roller gap of the roller press is less than the right roller gap, the stroke of the right electro-hydraulic actuator of the material pre-pressurization device increases by c mm, and the stroke of the left hydraulic actuator decreases by d mm. When the roller gap deviation is less than a, the strokes of the left and right electro-hydraulic actuators return to b mm.

[0032] The advantages and technical effects of this invention are as follows:

[0033] 1) By adopting a continuous pressurization method, all materials passing through the pressurization rollers are pre-pressurized and de-gassed, and the material channel volume in the pressurization area is constant, preventing material loosening and ensuring a more stable pre-pressurization effect.

[0034] The speed of the pressure roller can be infinitely adjusted. The friction between the moving roller and the material can be used to improve the efficiency of material feeding and discharge, offset the resistance to material descent caused by the reduction of the material channel volume, and maintain the material throughput per unit time of the roller press.

[0035] The rotating pressure roller can simultaneously achieve the roller gap adjustment function of the roller press, effectively avoiding the occurrence of roller misalignment.

[0036] 2) By setting up a material pre-pressurization device with automatic roller gap correction function, most of the gas in the loose material is squeezed out. The roller gap deviation of the roller press can be calculated in real time by the online roller gap measurement sensor, and the data signal of the deviation is transmitted to the controller. The controller calculates and controls the stroke of the electro-hydraulic push rod. This effectively prevents the roller press from experiencing air vibration and helps to improve the effective work of the roller press. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of the material silo of the present invention;

[0038] Figure 2 This is a schematic diagram of the material distribution device and the rotary multi-channel material distribution device of the present invention;

[0039] Figure 3 This is a schematic diagram of the material pre-pressurization device of the present invention;

[0040] Figure 4 for Figure 3 Rear view;

[0041] Figure 5 This is a schematic diagram of the pressure roller structure of the present invention;

[0042] Figure 6This is a schematic diagram of the pressurization mechanism of the present invention;

[0043] Figure 7 This is a schematic diagram showing the connection between the pressure roller and the pressure mechanism of the present invention;

[0044] Figure 8 This is a schematic diagram illustrating the working principle of material pre-pressurization in this invention.

[0045] Figure 9 This is a schematic diagram of the box structure of the present invention;

[0046] Figure 10 This is a schematic diagram illustrating the normal working principle of the roll gap in this invention.

[0047] Figure 11 This is a schematic diagram illustrating the working principle of the roller gap correction method of the present invention.

[0048] In the diagram: 11. Material stabilizing silo cylinder; 12. Material stabilizing silo cone; 13. Cylinder support; 2. Rotary multi-channel material distribution device; 3. Material pre-pressurization device; 31. Pre-pressurization variable frequency motor; 32. Universal coupling; 33. Pre-pressurization reducer; 34. Reducer torque support mechanism; 341. Hinge support; 342. Connecting rod; 35. Pressure roller; 351. Roller sleeve; 352. Roller shaft; 36. Bearing housing; 361. Bearing bracket; 37. 38. Guide key; 39. Pressurizing mechanism; 30. Electro-hydraulic actuator; 31. Oil pipe; 32. Electro-hydraulic actuator hinge support; 33. Housing; 34. Return hole; 35. Material limiting plate; 36. Pressure plate; 37. Pressure plate support; 48. Exhaust port; 59. Bottom plate; 60. Feed inlet; 71. Feed chute; 82. Distributor chute; 93. Manhole; 10. Dust collection port; 11. Discharge port; 12. Bin top reinforcing rib; 13. Material. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this patent.

[0050] like Figures 1-11 As shown, this invention discloses a material pre-pressurization stabilizing silo with automatic correction function. The silo includes a silo body, a material distribution device on the top of the silo, a rotary multi-channel material distribution device 2, and a material pre-pressurization device 3 on the bottom of the silo. The material to be ground is evenly distributed into the silo body 1 of the roller press by the material distribution device and the rotary multi-channel material distribution device 2. After being squeezed and degassed by the material pre-pressurization device 3, it is fed into the roller press at the bottom of the silo. At the same time, a certain material level is maintained in the silo to ensure the stable operation of the roller press.

[0051] like Figure 1As shown, the top of the material silo is equipped with a manhole door 6 to facilitate observation of the inside of the silo and the entry and exit of maintenance personnel. At the same time, a dust collection hole 7 is provided to promptly remove dust from the silo. Several silo top reinforcing ribs 9 are arranged in a cross shape on the upper surface of the silo top to ensure that the load-bearing positions of the device have sufficient strength.

[0052] The material silo body includes a material silo cylinder 11, a material silo cone 12, and a cylinder support 13. The material silo cylinder 11 is located at the upper end of the material silo body. The cylinder support 13 is provided on the lower outer wall of the material silo cylinder 11 for fixing and supporting the material silo. The material silo cone 12 provided at the lower end of the material silo cylinder 11 facilitates the conveying of the uniformly dispersed material to be ground to the opening of the material pre-pressurization device 3.

[0053] like Figures 3-11 As shown, the material pre-pressurization device 3 includes a matching pre-pressurization variable frequency motor 31, a pre-pressurization reducer 33, a pressurization roller 35, a bearing seat 36, and a pressurization mechanism 38;

[0054] The pre-pressurization variable frequency motor 31 and the pre-pressurization reducer 33 drive the pressure roller 35 to rotate, pre-pressurizing the continuously feeding material, and adjusting the pre-pressurization intensity as needed through the pressure mechanism 38. Preferably, the pressure roller 35 includes a roller sleeve 351 and a roller shaft 352 sleeved together. The two ends of the roller shaft 352 are fixed in bearing seats 36 on both sides of the roller sleeve 351. The end of the roller shaft 352 near the pre-pressurization variable frequency motor 31 is connected to the pre-pressurization reducer 33. The pre-pressurization variable frequency motor 31 and the pre-pressurization reducer 33 are connected by a universal coupling 32. The pre-pressurization reducer 33 is connected to the hinge support 341 of the reducer torque support mechanism 34 through a connecting rod 342.

[0055] Further preferably, the pressure roller 35 is provided with a pressure mechanism 38 on both sides. The pressure mechanism 38 includes an electro-hydraulic actuator 381 perpendicular to the roller shaft 352, an oil pipe 382, ​​and an electro-hydraulic actuator hinge support 383. The electro-hydraulic actuator hinge support 383 is fixed on the bearing seat 36. One end of the electro-hydraulic actuator 381 is horizontally fixed on the bearing bracket 361, and the other end is movably connected to the electro-hydraulic actuator hinge support 383 and faces the roller shaft 352. The oil pipe 382 is threaded to the interface of the pressure mechanism 38 to ensure the normal operation and safety of the hydraulic system. A vertically arranged guide key 37 is connected below the bearing seat 36, and a guide groove that cooperates with the guide key is provided on the bearing bracket 361. The guide key includes a guide rod fixed in the bearing seat and a disc-shaped guide seat fixed at the bottom of the guide rod. The guide seat moves or rotates linearly or rotates in the guide groove, thereby driving the guide rod and the bearing seat to move or rotate.

[0056] Preferred, such as Figures 8-9As shown, the material pre-pressurization device 3 has a box 39 on its outer side. The box 39 includes a return hole 391, a limiting plate 392, a pressure plate 393, a pressure plate support 394, an exhaust port 395, a bottom plate 396, and an inlet 397 communicating with the silo body. The inlet 397 is located at the top of the box and directly above the extrusion channel formed by the pressure roller and the inner wall of the box. The pressurization mechanism is located on the side of the pressure roller away from the inlet and is used to provide horizontal pressure to the pressure roller towards the inner wall of the box. When the material in the silo body enters from the inlet 397 above the pressure roller 35 and comes into contact with the pressure roller 35, the pressure roller 35 uses the friction between the roller surface and the material to continuously bite the material into the extrusion channel formed between the pressure roller 35 and the inner wall of the box to pre-pressurize the material, expel a large amount of air between the materials, increase the density of the material fed into the roller press, and help the roller press improve its working efficiency. In order to improve the extrusion strength of the material between the reinforcing pressure roller 35 and the inner wall of the box, multiple pressure plates 393 are provided on the outer side of the inner wall of the box for extruding the material, and pressure plate supports 394 are provided below the pressure plates 393.

[0057] Preferably, the pressure roller 35 rotates around the roller shaft 352 under the drive of the pre-pressurization variable frequency motor 31. The rotation direction of the roller surface is consistent with the material movement direction, and the linear velocity of the roller surface can be infinitely adjusted. Under the thrust of the electro-hydraulic push rods 381 on both sides of the roller shaft 352, the pressure roller 35 continuously pressurizes and exhausts the material passing between the pressure roller 35 and the pressure plate 393, thereby pre-pressurizing the material and improving the working efficiency of the roller press. The stroke of the electro-hydraulic push rods 381 on both sides of the roller shaft 352 can be adjusted independently. While pre-pressurizing the material, the material throughput on both sides of the roller gap can be adjusted, thereby adjusting the distribution of the material when it falls and preventing the roller deviation caused by uneven distribution of the material falling into the roller press.

[0058] Preferred, such as Figure 9 As shown, the housing 39 is connected to the end of the roller 352, and a horizontally oriented oblong hole is provided at the connection point. The roller can move or rotate horizontally within the oblong hole, thereby driving the bearing seat and the pressure roller to move or rotate horizontally, which facilitates the adjustment of the forward and backward stroke of the pressure roller 35 according to the amount of material. A return hole 391 is provided on the housing below the oblong hole. Material falling out of the oblong hole returns to the material pre-pressurization device 3 through the return hole 391. The limiting plate 392 is located on the side of the pressure roller 35 away from the pressurization mechanism 38, and is used to limit the passage range of the pre-pressurized material. The exhaust port 395 is located next to the feed port 397 above the pressure roller 35 and is connected to the dust collection equipment in the grinding system. Excess gas is discharged through the exhaust port 395.

[0059] Preferably, a vertical limiting plate 392 is provided at the bottom of the pressure roller on the side away from the pressing mechanism. The limiting plate 392 extends downward to the discharge port 8. The limiting plate 392 and the inner wall of the box form a feeding space located directly below the extrusion channel. This feeding space is suitable for the size of the pre-pressurized material to ensure that the material does not deform or become loose before being conveyed to the discharge port 8. The pre-pressurized material enters the roller press for pressing through the discharge port 8.

[0060] In a further preferred embodiment, the bottom plate 396 is inclinedly disposed directly below the pressure roller, and there is a gap between the material limiting plate 392 and the bottom plate 396. The material passing through the gap between the pressure roller 35 and the gap between the pressure roller 35 and the two side boxes is mixed with the pre-pressurized material again through the gap and discharged out of the chamber through the discharge port 8.

[0061] In a further preferred embodiment, the width of the discharge port is greater than the width between the limiting plate 39 and the inner wall of the box, ensuring that the pre-pressurized material can smoothly pass through the discharge port 8 and enter the inside of the roller press.

[0062] In a further preferred embodiment, the pre-pressurization intensity can be adjusted by finely adjusting the stroke of the electro-hydraulic actuator 381 of the pressurization mechanism, while simultaneously adjusting the speed of the pre-pressurization variable frequency motor 31. This reduces the material discharge cross-section and accelerates the material drop speed, thus meeting the feeding requirements of the roller press.

[0063] like Figure 10 , 11 As shown, the material pre-pressurization device 3 has an automatic roller gap correction function. When the roller press stabilizing hopper is working, the roller gap deviation is calculated in real time using the roller press online measurement sensor (not shown in the figure), and the data signal of the deviation is transmitted to the controller. The controller calculates and controls the stroke adjustment of the electro-hydraulic actuator. When the roller gap deviation at both ends of the roller press (not shown in the figure) exceeds the upper limit allowed by normal operation, the electro-hydraulic actuator 381 adjusts its respective advance stroke according to the instruction issued by the controller, forcibly reducing the feed amount of the roller press on the side with a larger roller gap and increasing the feed amount of the roller press on the side with a smaller roller gap. When the roller gap deviation returns to normal, the electro-hydraulic actuators 381 on both sides automatically resume the previous stroke, realizing intelligent automatic roller gap correction of the roller press.

[0064] Specifically, the upper limit of the roll gap deviation value (the absolute value of the difference between the left and right roll gaps of the roller press) is set to a mm. When the roll gap deviation value is < a, the strokes of the two electro-hydraulic actuators of the material pre-pressurization device are consistent at b mm, and only the material is pre-pressurized. When the roll gap deviation value is greater than a, if the left roll gap of the roller press is greater than the right roll gap, the stroke of the left electro-hydraulic actuator of the material pre-pressurization device increases by c mm, and the stroke of the right electro-hydraulic actuator decreases by d mm. If the left roll gap of the roller press is less than the right roll gap, the stroke of the right electro-hydraulic actuator of the pre-pressurization device increases by c mm, and the stroke of the left hydraulic actuator decreases by d mm. When the roll gap deviation value is less than a, the strokes of the left and right electro-hydraulic actuators return to b mm.

[0065] This invention also discloses a working method for the above-mentioned material pre-pressurization and stabilization silo with automatic correction function, the steps of which include:

[0066] S1. The material to be ground falls evenly into the rotary multi-channel material distribution device 2 at the four points of the feed chute 4 and the distribution chute 5, and then is fed into the horizontal section of the roller press silo by gravity.

[0067] S2. When the material enters the box from the feed inlet 397 above the pressure roller 35 and comes into contact with the pressure roller 35, the pressure roller 35 uses the friction between the roller surface and the material to continuously bite the material between the pressure roller 35 and the inner wall of the box, pre-pressurizing the material and expelling a large amount of air between the materials, increasing the density of the material fed into the roller press, which is beneficial to improving the working efficiency of the roller press; the material falling out from the roller shaft hole of the box returns to the material pre-pressurization device 3 through the return hole 391;

[0068] S3. The limiting plate 392 is located on the side of the pressure roller 35 away from the pressure mechanism 38, and is used to limit the passage range of the pre-pressurized material to ensure that the pre-pressurized material is intact and not loose; the exhaust port 395 is located next to the inlet above the pressure roller 35 and is connected to the dust collection equipment in the grinding system. Excess gas is discharged from the exhaust port 395.

[0069] S4. By finely adjusting the stroke of the electro-hydraulic push rod 381 of the pressurization mechanism, the pre-pressurization intensity is adjusted, and the speed of the pre-pressurization variable frequency motor 31 is adjusted at the same time. While the material discharge section is reduced, the material falling speed is accelerated to meet the feeding requirements of the roller press.

[0070] When the roller press is working, the roller press online gap measurement sensor calculates the roller press gap deviation in real time. When the gap deviation at both ends of the roller press exceeds the upper limit allowed for normal operation, the electro-hydraulic push rods 381 on both sides of the material pre-pressurization device 3 automatically adjust their respective push rod strokes according to the signal, forcibly reducing the feed amount of the roller press on the side with a larger gap and increasing the feed amount of the roller press on the side with a smaller gap. When the gap deviation returns to normal, the electro-hydraulic push rods 381 on both sides automatically resume the previous stroke, realizing intelligent automatic correction of the roller press gap.

[0071] The material silo of the present invention can automatically adjust when the roller gap deviation of the roller press is large, thereby improving the working efficiency of the roller press.

[0072] The above description is only 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 should be included within the protection scope of the present invention.

Claims

1. A material pre-pressurization device with automatic deviation correction function, characterized in that: The material pre-pressurization device is located between the bottom of the stabilizing silo and the roller press, and is used to squeeze and degas the material from the stabilizing silo before feeding it into the roller press. The material pre-pressurization device has a housing on its outer side; the housing has an inlet communicating with the material silo, and the inlet is located directly above the extrusion channel formed by the pressure roller and the inner wall of the housing; the material pre-pressurization device includes a pre-pressurization power structure, a pressure roller, and a pressurization mechanism; the pre-pressurization power structure is used to drive the pressure roller to rotate; the pressurization mechanism is located on the side of the pressure roller away from the inlet, and is used to provide horizontal pressure towards the inner wall of the housing to the pressure roller; under the pressure provided by the pressurization mechanism, the pressure roller continuously bites the material into the extrusion channel formed between the pressure roller and the inner wall of the housing to pre-pressurize the material; the pressurization mechanism includes two electro-hydraulic actuators perpendicular to the roller shaft; The material pre-pressurization device uses an online measurement sensor for the roller gap of the roller press to calculate the roller gap deviation in real time. When the roller gap deviation at both ends of the roller press exceeds the upper limit allowed for normal operation, the electro-hydraulic push rods on both sides of the material pre-pressurization device automatically adjust their respective push rod strokes according to the signal, forcibly reducing the feed amount of the roller press on the side with a larger roller gap and increasing the feed amount of the roller press on the side with a smaller roller gap. When the roller gap deviation returns to normal, the electro-hydraulic push rods on both sides automatically resume the previous stroke, realizing intelligent automatic correction of the roller gap of the roller press.

2. The material pre-pressurization device with automatic deviation correction function as described in claim 1, characterized in that: The pre-pressurization power structure includes a matching pre-pressurization variable frequency motor and a pre-pressurization reducer; the pressurization roller includes a roller sleeve and a roller shaft sleeved together, with both ends of the roller shaft fixed in bearing seats on both sides of the roller sleeve, and the end of the roller shaft near the pre-pressurization variable frequency motor connected to the pre-pressurization reducer, and the pre-pressurization variable frequency motor and the pre-pressurization reducer connected by a universal coupling; the pre-pressurization reducer is connected to the hinged support of the reducer torque support mechanism by a connecting rod.

3. The material pre-pressurization device with automatic deviation correction function as described in claim 2, characterized in that: The pressurizing mechanism also includes an oil pipe and an electro-hydraulic actuator hinge support; the electro-hydraulic actuator hinge support is fixed on the bearing housing, one end of the electro-hydraulic actuator is horizontally fixed on the bearing housing, and the other end is movably connected to the electro-hydraulic actuator hinge support and faces the roller shaft; the oil pipe is threaded to the interface of the pressurizing mechanism; a vertically arranged guide key is connected below the bearing housing, and a guide groove that mates with the guide key is provided on the bearing housing; the guide key includes a guide rod fixed in the bearing housing and a disc-shaped guide seat fixed at the bottom of the guide rod, and the guide seat moves or rotates linearly or rotates in the guide groove, thereby driving the guide rod and the bearing housing to move or rotate.

4. The material pre-pressurization device with automatic deviation correction function as described in claim 1, characterized in that: Multiple pressure plates are provided on the outer side of the inner wall of the extrusion chamber, and pressure plate supports are provided below the pressure plates.

5. The material pre-pressurization device with automatic deviation correction function as described in claim 2, characterized in that: The box body is connected to the end of the roller shaft, and a waist-shaped hole is provided at the connection. The roller shaft can move or rotate horizontally within the waist-shaped hole, thereby driving the bearing seat and the pressure roller to move or rotate horizontally. A return hole is provided on the box body below the waist-shaped hole. Material falling out from the waist-shaped hole returns to the material pre-pressurization device through the return hole.

6. The material pre-pressurization device with automatic deviation correction function as described in claim 1, characterized in that: The bottom of the pressure roller away from the pressure mechanism is a vertical limiting plate. The limiting plate extends downward to the discharge port. The limiting plate and the inner wall of the box form a feeding space located directly below the extrusion channel. This feeding space is suitable for the size of the pre-pressurized material. The pre-pressurized material enters the roller press for pressurization through the discharge port.

7. The material pre-pressurization device with automatic deviation correction function as described in claim 6, characterized in that: The width of the discharge port is greater than the width between the limiting plate and the inner wall of the box.

8. The material pre-pressurization device with automatic deviation correction function as described in claim 6, characterized in that: A bottom plate is inclined directly below the pressure roller. There is a gap between the material limiting plate and the bottom plate. The material passing through the gap between the pressure roller and the two side boxes is mixed with the pre-pressurized material through the gap and discharged out of the box through the discharge port.

9. A material silo, characterized in that: The material pre-pressurization device with automatic deviation correction function as described in any one of claims 1 to 8.

10. The method of operating the material pre-pressurization device with automatic deviation correction function as described in any one of claims 1 to 8, characterized in that: The steps include: S1. The material to be ground falls evenly into the horizontal section of the material silo; S2. When the material enters the box from the feed port above the pressure roller and comes into contact with the pressure roller, the pressure roller uses the friction between the roller surface and the material to continuously bite the material between the pressure roller and the inner wall of the box, pre-pressurize the material, and expel a large amount of air between the materials. S3. The pre-pressurization intensity is adjusted by adjusting the stroke of the electro-hydraulic actuator of the pressurization mechanism, and the material falling speed is adjusted by adjusting the speed of the pre-pressurization variable frequency motor. S4. When the roller press material silo is working, the roller press roller gap deviation is calculated in real time using the roller press roller gap online measurement sensor, and the data signal of the deviation is transmitted to the controller. The controller calculates and controls the advance stroke of the electro-hydraulic actuator.

11. The working method of the material pre-pressurization device with automatic deviation correction function as described in claim 10, characterized in that: When the deviation of the roll gap at both ends of the roller press exceeds the upper limit allowed for normal operation, the electro-hydraulic actuators automatically adjust their respective strokes according to the instructions issued by the controller, forcibly reducing the feed amount of the roller press on the side with a larger roll gap and increasing the feed amount of the roller press on the side with a smaller roll gap. When the roll gap deviation returns to normal, the electro-hydraulic actuators on both sides automatically resume the stroke before adjustment.

12. The working method of the material pre-pressurization device with automatic deviation correction function as described in claim 11, characterized in that: The absolute upper limit of the difference between the left and right roller gaps of the roller press is set to a mm. When the roller gap deviation is less than a, the strokes of the two electro-hydraulic actuators are the same, and the strokes of both the left and right electro-hydraulic actuators are b mm. When the roller gap deviation is greater than a, if the left roller gap of the roller press is greater than the right roller gap, the stroke of the left electro-hydraulic actuator of the pre-pressurization device increases by c mm, and the stroke of the right electro-hydraulic actuator decreases by d mm. If the left roller gap of the roller press is less than the right roller gap, the stroke of the right electro-hydraulic actuator of the material pre-pressurization device increases by c mm, and the stroke of the left hydraulic actuator decreases by d mm. When the roller gap deviation is less than a, the strokes of the left and right electro-hydraulic actuators return to b mm.

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