High-pressure roller mill with forced parallel function

Abstract

The invention relates to the technical field of high-pressure roller mills in the building material and mine industry, in particular to a high-pressure roller mill with a forced parallelism function, which comprises a rack, a fixed roller, a movable roller, a main oil cylinder, a left synchronous oil cylinder and a right synchronous oil cylinder, through the hydraulic communication design of the left synchronous oil cylinder and the right synchronous oil cylinder, the synchronous movement of two sides of the movable roller is realized, and the deviation of a roller gap is controlled within + / -0.5 mm; compared with a traditional mechanical synchronous structure, the precision is improved by 50%, complex sensor feedback is not needed, automatic deviation correction is achieved only through the hydraulic oil volume ratio and a communicating pipeline, control logic is simplified by 40%, the maintenance cost is reduced, a movable roller and a fixed roller are always kept parallel, eccentric wear and machine frame deformation are reduced, the service life of key components is prolonged by 30% or above, and stable roller gaps ensure that discharged particles are uniform; the crushing efficiency is improved by 15-20%, and the energy consumption is reduced by 10-15

Description

Technical Field

[0001] The present invention relates to the technical field of high-pressure roller grinding machines in the building materials and mining industries, in particular to a high-pressure roller grinding machine with a forced parallel function. Background Art

[0002] As we all know, in the building materials and mining industries, high pressure grinding rollers crush materials through the pressure between the fixed rollers and the movable rollers.

[0003] However, the prior art has the following defects: The reaction force generated on the pressure roller during the material extrusion process will cause the movable roller to retreat, resulting in a larger roller gap. When the material enters the pressure roller, a roller gap deviation is likely to occur on the driving side and the non-driving side. The existing mechanical synchronization structure is complex and bulky, and is prone to elastic and plastic deformation. The hydraulic correction system is complex to control, making it difficult to achieve synchronous movement on both sides of the movable roller. The frame articulation method easily leads to inconsistent deformation of the frames on both sides of the movable roller, and it is impossible to ensure that the movable and fixed rollers are parallel.

[0004] In patent CN111465450A, "Deflection distributor modification kit for roller crusher, roller crusher, and method for installing the kit," Metso's high-pressure roller adopts a mechanical synchronization structure. The structure is complex and large, and the larger the structure, the greater the elastic deformation. At the same time, long-term use will also cause mechanical plastic deformation, resulting in deflection of the two rollers. In patent CN102233288B, "A hydraulic system for a high-pressure roller mill," Chengdu Lijun Company uses a hydraulic system to correct the deviation of both sides of the movable roller. The control is complex and it is difficult to achieve synchronous movement of both sides of the movable roller. In patent CN10452006A, "Roller crusher with cheek plates," Metso's high-pressure roller adopts a frame articulation method to force the movable roller and fixed roller to be in a parallel state. However, after actual use of the high-pressure roller, the frames on both sides of the movable roller produce inconsistent deformation, and the movable and fixed rollers are always in a non-parallel state. Summary of the Invention

[0005] In order to overcome the problems of roll gap deviation, poor synchronization and complex control of existing high pressure roller grinding mills with forced parallel function and control methods thereof, the present invention provides a high pressure roller grinding mill with forced parallel function and control method thereof.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a high pressure roller grinding mill with a forced parallel function, comprising: frame; a fixed roller, fixed on the frame; A movable roller is placed on the guide rail of the frame and can slide along the guide rail; The main oil cylinder has its bottom fixed to the frame by bolts, the piston presses on the movable roller, and is connected to the accumulator and hydraulic station through hydraulic pipes; The left and right synchronous cylinders have their bottoms fixed to the frame by bolts, and their pistons fixed to the movable roller by bolts; and The left hydraulic chamber of the left synchronous cylinder is communicated with the right hydraulic chamber of the right synchronous cylinder through a hydraulic pipe, and the right hydraulic chamber of the left synchronous cylinder is communicated with the left hydraulic chamber of the right synchronous cylinder through a hydraulic pipe.

[0007] Preferably, the master cylinder is a single-piston rod cylinder that only applies unidirectional working pressure to the movable roller, and the left synchronous cylinder and the right synchronous cylinder are double-piston rod cylinders that can apply pressure and tension to the movable roller.

[0008] Furthermore, the position adjustment step of the movable roller is as follows: before starting the machine, the roller gap on both sides of the movable roller is adjusted by adjusting the ratio of the hydraulic oil volume V1 in the left hydraulic chamber of the left synchronous oil cylinder and the hydraulic oil volume V2 in the left hydraulic chamber of the right synchronous oil cylinder. When V1:V2=1:2, the movable roller is parallel to the fixed roller. Otherwise, the roller gap deviation is corrected by changing the ratio. Operation synchronization control steps: During equipment operation, when the left side of the movable roller deflects backward, the piston of the left synchronous cylinder retreats, and the hydraulic oil in its right hydraulic chamber flows into the left hydraulic chamber of the right synchronous cylinder, and the hydraulic oil in the right hydraulic chamber of the right synchronous cylinder flows into the left hydraulic chamber of the left synchronous cylinder. The left synchronous cylinder applies thrust to the left side of the movable roller, and the right synchronous cylinder applies pulling force to the right side, pushing both sides of the movable roller to retreat synchronously. Conversely, when the right side of the movable roller deflects, the action is reversed and synchronized.

[0009] Furthermore, the rod chambers of the master cylinders are connected via a hydraulic pipe, and the rodless chambers are connected via a hydraulic pipe, ensuring that the pressures of the master cylinders are consistent.

[0010] A further solution is to control the hydraulic oil volume of the left and right synchronous cylinders through the hydraulic valve and the hydraulic valve when adjusting the position of the movable roller. First close the hydraulic valve and open the hydraulic valve to adjust the left position of the movable roller, and then open the hydraulic valve and close the hydraulic valve to adjust the right position.

[0011] On the basis of the above solution, the piston axes of the left synchronous oil cylinder and the right synchronous oil cylinder are parallel to the sliding direction of the movable roller, ensuring that the thrust and pull are applied along the moving direction of the movable roller.

[0012] Further to the above solution, the piston axis of the main oil cylinder is perpendicular to the sliding direction of the movable roller, ensuring that the unidirectional pressure acts perpendicularly on the movable roller.

[0013] Further on the basis of the above solution, the guide rail of the frame is parallel to the axis of the fixed roller, ensuring that the movable roller slides in a direction parallel to the fixed roller. Beneficial effects

[0014] This high-pressure roller grinding mill with forced parallel function and its control method realize synchronous movement of both sides of the movable roller through the hydraulic connection design of the left and right synchronous cylinders. The roller gap deviation is controlled within ±0.5mm, which improves the accuracy by 50% compared with the traditional mechanical synchronous structure. No complex sensor feedback is required. Automatic correction is achieved only through the volume ratio of hydraulic oil and connecting pipelines. The control logic is simplified by 40%, and the maintenance cost is reduced. The movable roller and the fixed roller are always kept parallel, which reduces eccentric wear and frame deformation. The life of key components is extended by more than 30%. The stable roller gap ensures uniform discharge particles, the crushing efficiency is improved by 15%-20%, and the energy consumption is reduced by 10%-15%. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the main structure of the high pressure roller grinding mill of the present invention; Figure 2 This is a schematic diagram of the connection between the main oil cylinder and the left and right synchronous oil cylinders of the present invention; Figure 3 This is a schematic diagram of the movable roller connection structure of the present invention; Figure 4 It is a schematic diagram of the structure of the left and right synchronous cylinders of the present invention.

[0016] In the figure: 1. Frame; 2. Fixed roller; 3. Moving roller; 4. Main cylinder; 41. Rod chamber; 42. Rodless chamber; 5. Left synchronous cylinder; 6. Right synchronous cylinder; 561. Left hydraulic chamber; 562. Right hydraulic chamber; 7. Accumulator; 8. Hydraulic station; 91. Hydraulic pipe A; 92. Hydraulic pipe B; 93. Hydraulic pipe C; 94. Hydraulic pipe D; 95. Hydraulic valve A; 96. Hydraulic valve B. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] See Figures 1 to 4, a high-pressure roller mill with forced parallel function and a control method thereof, through the hydraulic connection design of the left and right synchronous cylinders 6 and the coordinated effect of the main cylinder 4, high-precision parallel control of the movable roller 3 and the fixed roller 2 is achieved. The core solution is: the main cylinder 4 applies unidirectional working pressure to the movable roller 3, and the left and right synchronous cylinders 6 are cross-connected through hydraulic pipelines (the left hydraulic chamber 561 of the left synchronous cylinder 5 is connected with the right hydraulic chamber 562 of the right synchronous cylinder 6, and the right hydraulic chamber 562 of the left synchronous cylinder 5 is connected with the left hydraulic chamber 561 of the right synchronous cylinder 6). The dynamic allocation of the hydraulic oil volume is used to drive the two sides of the movable roller 3 to move synchronously. This system solves the problems of large roll gap deviation and poor synchronization of traditional high-pressure roller mills, controls the roll gap deviation within ±0.5mm, improves the crushing efficiency by 15%-20%, and reduces energy consumption by 10%-15%.

[0019] First, see Figure 1 In this embodiment, the frame 1 is welded with high-strength cast steel, with anchor bolt mounting holes at the bottom and the fixed roller 2 fixed on the top. The guide rails on both sides are parallel to the axis of the fixed roller 2, providing a linear sliding guide for the movable roller 3. The surface of the guide rail is quenched (hardness HRC55-60) and cooperates with the slider at the bottom of the movable roller 3 to ensure that the sliding friction coefficient is ≤0.05, thereby reducing movement resistance.

[0020] The fixed roller 2 is fixed to the frame 1 through a bearing seat, and its surface is welded with a wear-resistant alloy (such as tungsten carbide) with a hardness of ≥60HRC. The movable roller 3 is placed on a guide rail and can slide horizontally along the guide rail. The roller surface structure is consistent with that of the fixed roller 2, and the two form an extrusion crushing chamber. The two sides of the movable roller 3 are rigidly connected to the pistons of the left and right synchronous cylinders 6 by bolts to ensure that the thrust / pull force of the synchronous cylinders directly acts on the movable roller 3.

[0021] Then, see Figure 2 In this embodiment, the main oil cylinder 4 is a single piston rod oil cylinder, the number of which is usually 2-4, which are symmetrically arranged behind the movable roller 3. The bottom of the oil cylinder is fixed to the frame 1 by bolts, and the piston axis is perpendicular to the sliding direction of the movable roller 3. The rodless cavity 42 is connected to the accumulator 7 and the hydraulic station 8 through a hydraulic pipe, and the rod cavities 41 are connected to each other to ensure that the pressure of each main oil cylinder 4 is consistent. The main oil cylinder 4 provides a working pressure of 10-30MPa to push the movable roller 3 to squeeze the material toward the fixed roller 2.

[0022] Secondly, see Figure 2 In this embodiment, the left and right synchronous cylinders 6 are both double-piston-rod cylinders, the bottom of which is fixed to the frame 1, and the piston axis is parallel to the sliding direction of the movable roller 3. The left hydraulic chamber 561 of the left synchronous cylinder 5 is connected to the right hydraulic chamber 562 of the right synchronous cylinder 6 through a high-pressure oil pipe, and the right hydraulic chamber 562 of the left synchronous cylinder 5 is connected to the left hydraulic chamber 561 of the right synchronous cylinder 6, forming a cross hydraulic circuit. The areas at both ends of the cylinder piston are equal, ensuring that the thrust and pull generated when the hydraulic oil flows are balanced.

[0023] This cross-connected structure enables the left and right synchronous cylinders 6 to form a "linked effect" - when one side of the movable roller 3 deflects, the hydraulic oil in the cylinder automatically flows to the other side, pushing the movable roller 3 to reset through the pressure difference, without the need for additional sensor feedback.

[0024] Again, see Figure 3 In this embodiment, the roller gap calibration is achieved by adjusting the ratio of the hydraulic oil volume V1 of the left hydraulic chamber 561 of the left synchronous cylinder 5 to the volume V2 of the left hydraulic chamber 561 of the right synchronous cylinder 6. When V1:V2=1:2, the gaps between the two sides of the movable roller 3 and the fixed roller 2 are equal (parallel state). If it is detected that the roller gap on the left side is larger than that on the right side, V1 is increased or V2 is decreased, so that the hydraulic oil pushes the piston of the left synchronous cylinder 5 forward, shortening the roller gap on the left side until the gap difference on both sides is ≤0.5mm.

[0025] When the material is squeezed and causes the left side of the movable roller 3 to deflect backward, the piston of the left synchronous cylinder 5 retreats, and the hydraulic oil in its right hydraulic chamber 562 flows into the left hydraulic chamber 561 of the right synchronous cylinder 6. At the same time, the hydraulic oil in the right hydraulic chamber 562 of the right synchronous cylinder 6 flows into the left hydraulic chamber 561 of the left synchronous cylinder 5, forming a "left push and right pull" force, pushing the two sides of the movable roller 3 to retreat synchronously to correct the deflection. When it deflects on the right side, the action is reversed to ensure that the movable roller 3 is always parallel to the fixed roller 2.

[0026] In addition, see Figure 1 In this embodiment, during the pretreatment of iron ore crushing, the hydraulic station 8 is started to supply oil to the rodless chamber 42 of the main cylinder 4, so that the movable roller 3 slowly approaches the fixed roller 2. The initial roller gap is set to 5 mm. The volume V1 of the left hydraulic chamber 561 of the left synchronous cylinder 5 is adjusted to 5 L, and the volume V2 of the left hydraulic chamber 561 of the right synchronous cylinder 6 is adjusted to 10 L (V1:V2=1:2) through the hydraulic valve group. At this time, the movable roller 3 is parallel to the fixed roller 2, and the roller gaps on both sides are 5 mm.

[0027] Iron ore powder enters the crushing chamber at a flow rate of 200t / h, and the pressure of the main cylinder 4 is maintained at 15MPa. When it is detected that the left side of the movable roller 3 moves back 0.8mm due to the reaction force of the material, the hydraulic oil (about 0.3L) in the right hydraulic chamber 562 of the left synchronous cylinder 5 flows into the left hydraulic chamber 561 of the right synchronous cylinder 6, and the hydraulic oil in the right hydraulic chamber 562 of the right synchronous cylinder 6 flows into the left hydraulic chamber 561 of the left synchronous cylinder 5. The left synchronous cylinder 5 applies a thrust of 20kN to the left side of the movable roller 3, and the right synchronous cylinder 6 applies a pulling force of 20kN to the right side, pushing the two sides of the movable roller 3 to move back 0.3mm synchronously. Finally, the roller gap on the left side is restored to 5.5mm, and the right side maintains 5.2mm, with a deviation of ≤0.5mm.

[0028] The cement clinker is finely crushed and the pressure of the main oil cylinder 4 is increased to 25MPa, which is suitable for the high hardness of the cement clinker (Mohs hardness 6-7).

[0029] Before starting the machine, set V1=8L ​​and V2=16L to ensure a parallelism of 3mm between the roller gaps. During operation, if the right side moves back 0.6mm due to uneven clinker particle size, the hydraulic oil in the synchronous cylinder will flow automatically and correct the deviation within 1 second, maintaining a qualified rate of ≥95% for discharge particle size ≤3mm, and reducing energy consumption by 12% compared to traditional roller mills.

[0030] Finally, see Figure 1 In this embodiment, the double-piston rod cylinder is replaced by a multi-stage telescopic cylinder to increase the stroke (for example, from 100 mm to 200 mm) to adapt to a larger roller gap adjustment range for processing ores of different particle sizes (for example, from a 50 mm roller gap for coarse crushing to a 5 mm roller gap for fine crushing).

[0031] A proportional servo valve is installed in the hydraulic pipeline of the synchronous cylinder, and the hydraulic oil flow is controlled in real time through the PLC, so that the dynamic correction accuracy is improved to ±0.2mm, which is suitable for scenarios that require ultra-fine crushing such as rare earth ores.

[0032] For copper, lead, zinc and other ores, the roller surface wear-resistant layer is replaced with a ceramic coating, and the synchronous cylinder hydraulic oil is replaced with anti-wear hydraulic oil (viscosity index VI ≥ 180) to maintain stable synchronization performance at an ambient temperature of 25℃-80℃.

[0033] Adjust the pressure of the main cylinder 4 to 10MPa and increase the stroke of the synchronous cylinder to 150mm. A larger roller gap (10-20mm) is allowed when processing construction waste. Combined with the hydraulic connection design, it ensures that the particle size of the crushed recycled aggregate is uniform and the needle-like content is ≤10%.

[0034] Working principle: When using the high-pressure roller grinding mill with forced parallel function and its control method, first adjust the roller gap before starting the machine: Close the hydraulic valve A95, open the hydraulic valve B96, and inject hydraulic oil into the left hydraulic chamber 561 and the right hydraulic chamber 562 of the left synchronous cylinder 5 through the hydraulic station 8. Adjust the left position of the movable roller 3 and record the volume V1 of the left hydraulic chamber 561 at this time. Open hydraulic valve A95 and close hydraulic valve B96. Similarly, adjust the right side position of the movable roller 3 and record the volume V2 of the left hydraulic chamber 561 of the right synchronous cylinder 6. When V1:V2=1:1, the movable roller 3 is parallel to the fixed roller 2; if there is eccentric wear or installation error, the roller gap can be corrected by adjusting the ratio of V1 to V2 (such as 1.1:1).

[0035] Synchronous control during operation: When the material is squeezed and causes the left side of the movable roller 3 to deflect backward, the piston of the left synchronous cylinder 5 retreats, and the hydraulic oil in the right hydraulic chamber 562 flows into the left hydraulic chamber 561 of the right synchronous cylinder 6 through the hydraulic pipe D94. At the same time, the hydraulic oil in the right hydraulic chamber 562 of the right synchronous cylinder 6 flows into the left hydraulic chamber 561 of the left synchronous cylinder 5 through the hydraulic pipe C93. At this time, the left synchronous cylinder 5 applies a forward thrust to the left side of the movable roller 3, and the right synchronous cylinder 6 applies a backward pulling force to the right side, pushing both sides of the movable roller 3 to move backward synchronously to eliminate the deflection; On the contrary, when the movable roller 3 deflects to the right, the hydraulic oil flows in the opposite direction, and the left and right synchronous cylinders 6 move in the opposite direction, ensuring that the movable roller 3 is always parallel to the fixed roller 2.

[0036] Normal operation: The hydraulic station 8 supplies oil to the main cylinder 4, and the system pressure is maintained stable through the accumulator 7. The main cylinder 4 pushes the movable roller 3 to apply working pressure to the fixed roller 2. The synchronous cylinder automatically maintains the parallel state of the movable roller 3 through hydraulic communication.

[0037] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high pressure roller grinding mill with forced parallel function, characterized in that: include: Rack (1); A fixed roller (2) is fixed on the frame (1); A movable roller (3) is placed on the guide rail of the frame (1) and can slide along the guide rail; The main oil cylinder (4) has its bottom fixed to the frame (1) by bolts, the piston is pressed against the movable roller (3), and is connected to the accumulator (7) and the hydraulic station (8) through a hydraulic pipe; The left synchronous oil cylinder (5) and the right synchronous oil cylinder (6) are fixed to the frame (1) at the bottom by bolts, and the pistons are fixed to the movable roller (3) by bolts; and The left hydraulic chamber (561) of the left synchronous oil cylinder (5) is communicated with the right hydraulic chamber (562) of the right synchronous oil cylinder (6) through a hydraulic pipe, and the right hydraulic chamber (562) of the left synchronous oil cylinder (5) is communicated with the left hydraulic chamber (561) of the right synchronous oil cylinder (6) through a hydraulic pipe.

2. The high pressure roller grinding mill with forced parallel function according to claim 1, characterized in that: The master oil cylinder (4) is a single-piston rod oil cylinder that applies only one-way working pressure to the movable roller (3); the left synchronous oil cylinder (5) and the right synchronous oil cylinder (6) are double-piston rod oil cylinders that can apply pressure and tension to the movable roller (3).

3. A control method for the high pressure roller grinding mill with forced parallel function according to claim 1, characterized in that include: Steps for adjusting the position of the movable roller (3): Before starting the machine, adjust the roller gaps on both sides of the movable roller (3) by adjusting the ratio of the hydraulic oil volume V1 in the left hydraulic chamber (561) of the left synchronous oil cylinder (5) to the hydraulic oil volume V2 in the left hydraulic chamber (561) of the right synchronous oil cylinder (6). When V1:V2=1:2, the movable roller (3) is parallel to the fixed roller (2). Otherwise, the roller gap deviation is corrected by changing the ratio. Operation synchronization control steps: During the operation of the equipment, when the left side of the movable roller (3) deflects backward, the piston of the left synchronous oil cylinder (5) retreats, and the hydraulic oil in its right hydraulic chamber (562) flows into the left hydraulic chamber (561) of the right synchronous oil cylinder (6). The hydraulic oil in the right hydraulic chamber (562) of the right synchronous oil cylinder (6) flows into the left hydraulic chamber (561) of the left synchronous oil cylinder (5). The left synchronous oil cylinder (5) applies a thrust to the left side of the movable roller (3), and the right synchronous oil cylinder (6) applies a pulling force to the right side, pushing the two sides of the movable roller (3) to retreat synchronously. On the contrary, when the right side of the movable roller (3) deflects, the action is reversed and synchronized.

4. The control method for a high pressure grinding roller with a forced parallel function according to claim 3, characterized in that: The rod chamber (41) of the master oil cylinder (4) is connected via a hydraulic pipe, and the rodless chamber (42) is connected via a hydraulic pipe, thereby ensuring that the pressure of each master oil cylinder (4) is consistent.

5. The control method for a high pressure grinding roller with a forced parallel function according to claim 3, characterized in that: When adjusting the position of the movable roller (3), the volume of the hydraulic oil of the left and right synchronous oil cylinders (6) is controlled by the hydraulic valve and the hydraulic valve. The hydraulic valve is first closed and then opened to adjust the left position of the movable roller (3), and then the hydraulic valve is opened and then closed to adjust the right position.

6. The high pressure roller grinding mill with forced parallel function according to claim 1, characterized in that: The piston axes of the left synchronous oil cylinder (5) and the right synchronous oil cylinder (6) are parallel to the sliding direction of the movable roller (3), ensuring that the thrust and pull are applied along the moving direction of the movable roller (3).

7. The high pressure roller grinding mill with forced parallel function according to claim 1, characterized in that: The piston axis of the main oil cylinder (4) is perpendicular to the sliding direction of the movable roller (3), ensuring that the unidirectional pressure acts perpendicularly on the movable roller (3).

8. The high pressure roller grinding mill with forced parallel function according to claim 1, characterized in that: The guide rail of the frame (1) is parallel to the axis of the fixed roller (2), ensuring that the movable roller (3) slides in a direction parallel to the fixed roller (2).

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