Roller press with automatic adjustment of the original roll gap and method for adjusting the original roll gap thereof

Abstract

The present application relates to a kind of automatic adjustment original roll gap roller and its original roll gap adjusting method.The roller includes original roll gap adjusting device, multiple displacement sensors and controller.Original roll gap adjusting device includes step block one, step block two and driving mechanism.Step block one is fixedly connected on fixed roll bearing seat.Step block two is slidably connected with movable roll bearing seat along vertical direction.Driving mechanism is fixedly connected on movable roll bearing seat, for driving step block two to lift.Multiple displacement sensors are used to detect the height of step block two and roll gap respectively.Controller is used to query and obtain the ideal height of step block two in a pre-stored conversion table according to a preset original roll gap, and control driving mechanism to drive step block two to ideal height.The present application can adjust original roll gap under the condition that roller does not stop, not only reduce manual labor intensity, but also improve the efficiency of original roll gap adjustment, meet the needs of industrial production.

Description

Technical Field

[0001] This invention relates to a roller press, and more particularly to a roller press with automatic adjustment of the initial roller gap and a method for adjusting the initial roller gap of a roller press. Background Technology

[0002] Please see Figure 1 and Figure 2 . Figure 1 This is a schematic diagram of the feeding process of the roller press in the background art of this invention; Figure 2 This is a schematic diagram of the initial roller gap adjustment in an existing roller press according to the background art of this invention. When the roller press is working, the material passes through the roller gap between two rollers (a fixed roller and a movable roller). The size of the roller gap can be characterized by measuring the distance between the bearing seats of the movable roller and the fixed roller. The size of the roller gap directly affects the material throughput and the extrusion effect of the roller press. When the roller press is first started, if... Figure 1 As shown, the gap between the two rollers is called the initial gap, which is the minimum gap that the roller press can achieve during operation (mechanically limited). The initial gap directly affects the operating performance of the roller press and is one of the parameters that is most important during operation. Generally, after the rollers have been running for a period of time, the roller surfaces will wear down, and the distance between the two rollers will naturally increase, at which point the initial gap needs to be adjusted. Another situation is when changing materials or proportions, which alters the operating characteristics of the roller press, requiring corresponding adjustments to the initial gap to adapt to production.

[0003] The current method of limiting the roll gap mainly relies on the mechanical limiting of the shims between the two bearing seats. Adjusting the original roll gap mainly involves replacing the shims with different thicknesses, such as... Figure 2 As shown, bolt holes are drilled on the side of the bearing housing of the fixed roller of the roller press, and there are also bolt holes on the shims. The shims are fixed to the side wall of the roller press bearing housing by tightening the bolts. The original roller gap is adjusted by changing shims of different thicknesses. There are a total of shim adjustment positions on the roller press. Manually adjusting the original roller gap is time-consuming and labor-intensive. In addition, when manually changing the shims, a certain amount of operating space is required. The movable roller of the roller press must be moved back to a relatively far position; otherwise, the operator cannot reach in and tighten the bolts. Therefore, the roller press must be stopped before changing the shims. Summary of the Invention

[0004] Therefore, it is necessary to provide a roller press with automatic adjustment of the original roll gap and its original roll gap adjustment method to address the problem that existing roller presses require a shutdown operation when adjusting the original roll gap, resulting in a low original roll gap adjustment rate.

[0005] The present invention is achieved through the following technical solution: a roller press for automatically adjusting the original roll gap includes a frame, a fixed roll bearing seat, a movable roll bearing seat, a hydraulic device, an original roll gap adjustment device, multiple displacement sensors and a controller.

[0006] The fixed roller bearing housing is fixedly connected to the frame. A sliding groove is provided within the frame for the movable roller bearing housing to slide. The movable roller bearing housing and the fixed roller bearing housing are positioned opposite each other. A hydraulic device is used to drive the movable roller bearing housing to slide within the groove, causing the movable roller bearing housing to move closer to or further away from the fixed roller bearing housing. To visually illustrate the adjustment effect of this invention, the distance between the movable roller bearing housing and the fixed roller bearing housing is defined as the roll gap, and the minimum distance that the movable roller bearing housing and the fixed roller bearing housing can achieve during the operation of the roller press is defined as the initial roll gap.

[0007] The original roll gap adjustment device includes a stepped block one, a stepped block two, and a drive mechanism. Stepped block one is fixedly connected to the fixed roller bearing seat. Stepped block two is slidably connected to the movable roller bearing seat in the vertical direction. The drive mechanism is fixedly connected to the movable roller bearing seat and is used to drive stepped block two to move up and down. Stepped block two and stepped block one each have n identical steps, and the step surfaces of stepped block two are opposite to the step surfaces of stepped block one, but in opposite directions. Let the height of the step be h. s The first step is defined as when step two is at the same height as step one. If step two is a forward step, then step two rises i h steps at a time. s Let be the (i+1)th gear. If the second step is a reverse step, then every i steps down from the second step... s Let be the (i+1)th gear, where i∈{1,2,3,……,n-1}.

[0008] Multiple displacement sensors are used to detect the real-time height h and real-time roll gap d of the second stepped block.

[0009] The controller is used to: 1. Query and obtain the ideal height h of step block 2 from a pre-stored conversion table based on a preset target original roll gap. w The conversion table is used to represent the mapping relationship between the original roll gap and the ideal height. Second, the control drive mechanism drives the second step block to the ideal height. The specific process is as follows: Determine if the real-time roll gap d is less than a preset roll retraction distance d1. If so, send a pressure relief signal to the hydraulic device until d > d1. Otherwise, send a drive signal to the drive mechanism until the second step block reaches the ideal height h. w .

[0010] The aforementioned roller press adjusts the height of step block two, allowing it to engage with step block one at different heights, thus regulating the initial roll gap. By setting different speed settings and selecting step block two and step block one of corresponding sizes, step block two is driven to the height corresponding to each setting. This not only adjusts the initial roll gap but also maximizes the contact area between step block two and step block one below the initial roll gap, improving the stability of the roller press. The roller press can adjust the initial roll gap without stopping the machine, reducing manual labor intensity and increasing the efficiency of initial roll gap adjustment, meeting the needs of industrial production.

[0011] In one embodiment, during the movement of the stepped block two driven by the drive mechanism, it is determined whether the real-time roll gap d is less than a preset alarm action distance d2. If so, an alarm signal is generated and a stop signal is sent to the drive mechanism. Subsequently, a pressure relief signal is sent to the hydraulic device until d > d1. Then, a drive signal is sent to the drive mechanism until the stepped block two reaches the ideal height. Finally, a pressurization signal is sent to the hydraulic device until the hydraulic device is pressurized to the initial set value. Wherein, d2 < d1.

[0012] In one embodiment, a guide rail arranged in a vertical direction is fixedly connected to the movable roller bearing seat, and a groove that is slidably connected to the guide rail is provided on the stepped block two.

[0013] In one embodiment, the drive mechanism includes a lead screw assembly, a motor, and a worm gear assembly. The lead screw assembly includes a lead screw and two bearings. The two bearings are positioned opposite each other and are fixedly connected to the movable roller bearing housing. Both ends of the lead screw pass through the two bearings and are fixedly connected to them. An internal thread matching the lead screw is provided within the stepped block. The worm gear assembly includes a worm wheel and a worm. The worm wheel is coaxially arranged with the lead screw and fixedly connected to one end of the lead screw. The worm meshes with the worm wheel. The motor is fixedly connected to the movable roller bearing housing, and the motor's output shaft is fixedly connected to the worm for driving the worm to rotate.

[0014] In one embodiment, the two bearings are positioned at the upper and lower limits, respectively, so that the second step block is always between the first gear and the nth gear.

[0015] In one embodiment, the lead screw is a trapezoidal lead screw. The trapezoidal lead screw and the step block constitute a trapezoidal lead screw assembly.

[0016] In one embodiment, the width of the step is set by: 1. Setting the minimum value d of the original roll gap according to the material size applicable to the roller press. min and maximum value d max 2. Set n gear positions, corresponding to the step width d. s for:

[0017] d s =(d max -d min ) / (n-1), k=1,2,3,...n.

[0018] In one embodiment, the conversion table is established by first calculating the ideal height h of step block two at each position. w Get the height h of each step. s And the initial height h0 of step block two. If step block two is a positive step, then the ideal height h corresponding to each step is... w Expressed as:

[0019] h wk =h0+(k-1)h s .

[0020] If step block two is a reverse step, then the ideal height h corresponding to each step is... w Expressed as:

[0021] h wk =h0-(k-1)h s .

[0022] In the formula, h wk The ideal height for the k-th gear.

[0023] Next, calculate the original roll gap for each gear position. The original roll gap is expressed as:

[0024] d mink =(k-1)×(d max -d min ) / (n-1) +d min

[0025] In the formula, d mink This represents the original roll gap corresponding to the k-th gear.

[0026] Finally, a conversion table is created based on the original roll gap and ideal height corresponding to each gear.

[0027] The present invention also provides a method for adjusting the initial roll gap of a roller press, the method comprising the following steps:

[0028] S1: Obtain the real-time height h and real-time roll gap d of the second step block of the roller press.

[0029] S2: Calculate the ideal height h of the corresponding stepped block two based on the set target original roll gap. w The specific calculation method is as follows:

[0030] S21: Based on the target original roll gap d p Once the corresponding gear is calculated, the gear k is expressed as:

[0031] k = [(d p - d min ) × (n - 1) / (d max - d min )] + 1

[0032] Where, d min is the minimum value of the original roll gap, d max is the maximum value of the original roll gap, and n is the total number of gear positions.

[0033] S22: Calculate the ideal height of the second step block according to the gear position k. If the second step block is a forward step, the ideal height is expressed as:

[0034] h wk = h0 + (k - 1)h s .

[0035] If the second step block is a reverse step, the ideal height is expressed as:

[0036] h wk = h0 - (k - 1)h s .

[0037] Where, h wk is the ideal height corresponding to the kth gear position, h0 is the initial height of the second step block, and h s is the height of each step of the second step block.

[0038] S3: Control the drive mechanism to drive the second step block to the ideal height. The specific process is as follows: Determine whether the real-time roll gap d is less than a preset roll-back distance d1. If so, send a pressure-relief signal to the hydraulic device until d < d1. Otherwise, send a drive signal to the drive mechanism until the second step block reaches the ideal height h w .

[0039] In one embodiment, in step S3, the following method is used to drive the second step block to the ideal height: Determine whether the real-time roll gap d is greater than the ideal roll gap d w , and make the following decisions: a. When d > d w , send a drive signal to the drive mechanism until the second step block reaches the ideal height h w . b. When d ≤ d w , send a pressure-relief signal to the hydraulic device until d > d w . Subsequently, send a drive signal to the drive mechanism until the second step block reaches the ideal height h w . Finally, send a pressure-boosting signal to the hydraulic device until the hydraulic device is boosted to the initial set value. Among them, the ideal roll gap d w is expressed as:

[0040] dw =d p + .

[0041] In the formula, The error distance is set manually.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] This invention, by setting different speed settings and selecting step blocks two and one of corresponding sizes according to the settings, uses a drive mechanism to drive step block two to the height corresponding to each speed setting. This not only adjusts the original roll gap of the roller press but also maximizes the contact area between step blocks two and one under the original roll gap, improving the stability of the roller press. This invention allows for adjustment of the original roll gap without stopping the machine, reducing manual labor intensity and improving the efficiency of original roll gap adjustment, thus meeting the needs of industrial production. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the feeding process of the roller press in the background art of this invention;

[0045] Figure 2 This is a schematic diagram of the original roller gap adjustment of an existing roller press in the background art of this invention;

[0046] Figure 3 This is a three-dimensional structural diagram of the roller press for automatically adjusting the original roller gap according to Embodiment 1 of the present invention;

[0047] Figure 4 for Figure 3 A schematic diagram of the main structure of a roller press that automatically adjusts the original roll gap;

[0048] Figure 5 for Figure 3 A partial three-dimensional structural diagram of the original roller gap adjustment device;

[0049] Figure 6 for Figure 3 Another partial three-dimensional structural diagram of the original roller gap adjustment device;

[0050] Figure 7 This is a step diagram of the original roll gap adjustment method of the roller press in Embodiment 2 of the present invention.

[0051] Explanation of main component symbols

[0052] The diagram is labeled as follows: 1. Frame; 2. Fixed roller bearing seat; 21. Fixed roller; 3. Movable roller bearing seat; 31. Movable roller; 4. Hydraulic device; 5. Original roller gap adjustment device; 51. Step block one; 52. Step block two; 53. Drive mechanism; 531. Screw assembly; 5311. Screw; 5312. Bearing; 532. Worm gear assembly; 5321. Worm gear; 5322. Worm; 533. Motor.

[0053] The above description of the main component symbols, together with the accompanying drawings and specific embodiments, provides a more detailed explanation of the present invention. Detailed Implementation

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] It should be noted that when a component is said to be "installed on" another component, it can be directly on the other component or it may be in a component that is centered on it. When a component is said to be "set on" another component, it can be directly set on the other component or it may also be in a component that is centered on it. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or it may also be in a component that is centered on it.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0057] Example 1

[0058] Please see Figure 3 and Figure 4 , Figure 3 This is a three-dimensional structural diagram of the roller press for automatically adjusting the original roller gap according to Embodiment 1 of the present invention; Figure 4 for Figure 3 A schematic diagram of the main structure of a roller press that automatically adjusts the initial roll gap. The roller press that automatically adjusts the initial roll gap includes: frame 1, fixed roll bearing seat 2, movable roll bearing seat 3, hydraulic device 4, initial roll gap adjustment device 5, multiple displacement sensors and controllers.

[0059] The fixed roller bearing seat 2 is fixedly connected to the frame 1. A sliding groove is provided inside the frame 1 for the movable roller bearing seat 3 to slide. The movable roller bearing seat 3 is positioned opposite the fixed roller bearing seat 2. Correspondingly, the fixed roller 21 is mounted on the fixed roller bearing seat 2, and the movable roller 31 is mounted on the movable roller bearing seat 3. In typical roller press operation, the distance between the movable roller 31 and the fixed roller 21 is defined as the roller gap. In this embodiment, for ease of understanding, the distance between the movable roller bearing seat 3 and the fixed roller bearing seat 2 is defined as the roller gap. Correspondingly, the minimum distance that the movable roller bearing seat 3 and the fixed roller bearing seat 2 can achieve during roller press operation is defined as the original roller gap.

[0060] Hydraulic device 4 drives the movable roller bearing seat 3 to slide within the groove, allowing it to move closer to or further away from the fixed roller bearing seat 2. After the roller press is started, hydraulic device 4 pressurizes to the set value, and the material falls between the fixed roller 21 and the movable roller 31. The material is squeezed by the fixed roller 21 and the movable roller 31 under the thrust of hydraulic device 4. The reaction force generated by the material being squeezed by the rollers interacts with the thrust of hydraulic device 4. When the reaction force is greater than the thrust of hydraulic device 4, the movable roller bearing seat 3 moves to retract from the roller. When the reaction force is less than the thrust of hydraulic device 4, the movable roller bearing seat 3 moves to advance into the roller.

[0061] When the material feed rate is low, the hydraulic device 4 drives the movable roller bearing seat 3 to approach the fixed roller bearing seat 2. At this time, the distance between the movable roller 31 and the fixed roller 21 reaches its minimum, and the corresponding roller gap also reaches its minimum. This roller gap is defined as the original roller gap. If the hydraulic device 4 reduces the pressure applied to the movable roller bearing seat 3 or applies a reverse pulling force to the movable roller bearing seat 3, the movable roller bearing seat 3 moves away from the fixed roller bearing seat 2 until it reaches a preset limit point. In the prior art, pads of different thicknesses are added between the fixed roller bearing seat 2 and the movable roller bearing seat 3 to change the original roller gap, thereby adjusting the output material size.

[0062] Please combine Figure 5 , it is Figure 3A partial three-dimensional structural diagram of the original roll gap adjustment device 5. The original roll gap adjustment device 5 includes a stepped block 51, a stepped block 52, and a drive mechanism 53. The stepped block 51 is fixedly connected to the fixed roller bearing seat 2. The stepped block 52 is slidably connected to the movable roller bearing seat 3 in the vertical direction. In this embodiment, two guide rails are fixedly connected to the movable roller bearing seat 3 in the vertical direction, and the stepped block 52 has a groove that is slidably connected to the guide rails. The two guide rails not only guide the stepped block 52 and prevent it from deviating from its path during movement, but also make the structure more stable and prevent the stepped block 52 from deflecting to both sides. In other embodiments, a vertically arranged long groove can be opened on the movable roller bearing seat 3, and a corresponding guide rail or slider can be provided on the stepped block 52 to allow the stepped block 52 to move along the long groove.

[0063] Both step block 2 (52) and step block 1 (51) have n identical steps, and the step surfaces of step block 2 (52) and step blocks 1 (51) are positioned opposite each other vertically. Let the height of each step be h. s The first gear is defined as the position where step block 2 52 is at the same height as step block 1 51. In the first gear, if the roll gap reaches the original roll gap, step block 1 51 and step block 2 52 will be perfectly fitted together. That is, each step of step block 1 51 and step block 2 52 will be relatively fitted together, forming a rectangular block structure.

[0064] If step block 2 52 is a forward-facing step, meaning its orientation is similar to that of a typical staircase, then step block 1 51 is a reverse-facing step. Therefore, step block 2 52 ascends i steps... s Let be the (i+1)th gear, and a total of n gears be set. Where i ∈ {1, 2, 3, ..., n-1}. Specifically, for each step the second stair block 52 ascends, a gear is added. Correspondingly, at the k-th (k=1, 2, 3, ..., n) gear, the bottom step of the second stair block 52 has the same height as the k-th step from bottom to top of the first stair block 51.

[0065] If step block 2 52 is a reverse step, then the corresponding step block 1 51 is a forward step. Therefore, step block 2 52 descends i h steps... s Let be the (i+1)th gear position, and there are n gear positions in total. Correspondingly, in the kth (k=1,2,3,...n) gear position, the top step of step block 2 52 has the same height as the kth step from top to bottom of step block 1 51.

[0066] In this embodiment, the number of steps in step block 51 and step block 52 is set to 4, and correspondingly, the number of stops is also set to 4. Of course, in other embodiments, the number of steps can be more or less, but not less than 2.

[0067] The initial roll gap adjustment is related to the required material size. The initial roll gap size is set according to the material size requirements, which in turn sets the number of gears, and then sets the step width based on the number of gears. The step width can be set using the following method:

[0068] 1. Define the minimum distance that the movable roller bearing housing 3 and the fixed roller bearing housing 2 can achieve during the operation of the roller press as the initial roller gap. Set the minimum value d of the initial roller gap according to the material size applicable to the roller press. min and maximum value d max The minimum and maximum values ​​of the initial roll gap are related to the original size of the material and the size of the material output from the roll press, and are preset values.

[0069] II. Set n levels. The first level corresponds to the minimum original roll gap, and the nth level corresponds to the maximum original roll gap. The original roll gap increases sequentially at equal intervals for each level, which corresponds to setting the width d of the step. s for:

[0070] d s =(d max -d min ) / (n-1)

[0071] The original roll gap corresponding to each gear position is:

[0072] d mink =(k-1)×(d max -d min ) / (n-1) +d min

[0073] In the formula, d mink This represents the original roll gap corresponding to the k-th gear.

[0074] Please combine Figure 6 , it is Figure 3 Another partial three-dimensional structural diagram of the original roller gap adjustment device. The drive mechanism 53 is fixedly connected to the movable roller bearing seat 3 and is used to drive the step block 52 to rise and fall. Specifically, the drive mechanism 53 includes a lead screw assembly 531, a motor 533, and a worm gear assembly 532. The lead screw assembly 531 includes a lead screw 5311 and two bearings 5312. The two bearings 5312 are vertically opposite each other and fixedly connected to the movable roller bearing seat 3. The two ends of the lead screw 5311 pass through the two bearings 5312 and are fixedly connected to them. The step block 52 has an internal thread matching the lead screw 5311. The lead screw assembly 531 and the step block 52 together constitute the lead screw 5311 transmission mechanism. In this embodiment, the lead screw 5311 is a trapezoidal lead screw 5311, which not only has a self-locking function but also a stronger load-bearing capacity.

[0075] The two bearings 5312 are designated as upper bearing 5312 and lower bearing 5312 based on their relative positions. Upper bearing 5312 and lower bearing 5312 are positioned at the upper and lower limits, respectively, ensuring that step block 2 52 is always between the first and nth positions. Specifically, when step block 2 52 is a forward step, the lower limit is at the same height as the top surface of step block 1 51. When step block 2 52 is a reverse step, the upper limit is at the same height as the top surface of the step block. The height difference between the upper and lower limits is (2n-1)d. s .

[0076] The worm gear assembly 532 includes a worm gear 5321 and a worm 5322. The worm gear 5321 is coaxially arranged with and fixedly connected to one end of the lead screw 5311. The worm 5322 meshes with the worm gear 5321. The motor 533 is fixedly connected to the movable roller bearing seat 3, and the output shaft of the motor 533 is fixedly connected to the worm 5322 for driving the worm 5322 to rotate.

[0077] When adjusting the height of step block 52, motor 533 drives worm gear 5322 to rotate, which in turn drives worm wheel 5321 and lead screw 5311 to rotate synchronously, thereby driving step block 52 to slide along the guide rail. After motor 533 is turned off, since both lead screw 5311 and worm gear assembly 532 have self-locking function, the stability of step block 52 can be effectively improved, preventing step block 52 from sliding down.

[0078] Multiple displacement sensors are used to detect the height h and roll gap d of the second step block 52. In this embodiment, a first displacement sensor is fixedly connected to the movable roller bearing seat 3. The first displacement sensor is higher than the upper bearing 5312 and detects vertically downwards. Based on its own height and the distance between itself and the second step block 52, the actual height of the second step block 52 can be calculated. A second displacement sensor is installed on the side of the frame 1. The second displacement sensor is located on the side of the movable roller bearing seat 3 away from the fixed roller bearing seat 2, and the second displacement sensor detects along the groove direction of the frame 1. Based on the initial position of the second displacement sensor, the distance between the second displacement sensor and the fixed roller bearing seat 2, and the distance between the second displacement sensor and the movable roller bearing seat 3, the distance between the movable roller bearing seat 3 and the fixed roller bearing seat 2, i.e., the roll gap, can be calculated. Of course, in other embodiments, the displacement sensors can also be set in other positions, as long as they can detect the height of the second step block 52 and the roll gap.

[0079] The controller is used to: 1. Query and obtain the ideal height h of step block 2 (52) from a pre-stored conversion table based on a preset target original roll gap. w The conversion table represents the mapping relationship between the original roll gap and the ideal height.

[0080] The conversion table can be established using the following method: First, calculate the ideal height h of step block 2.52 corresponding to each gear position. w Specifically, first obtain the height h of each step. s And the initial height h0 of step block 52. If step block 52 is a positive step, and each additional step raises step 52 by one step, then the ideal height h is... w It can be expressed as: h wk =h0+(k-1)h s .

[0081] If step block 2 52 is a reverse step, then for each additional step, step block 2 52 decreases by one step height. Therefore, the ideal height h is... w It can be expressed as: h wk =h0-(k-1)h s .

[0082] In the formula, h wk The ideal height for the k-th gear.

[0083] Secondly, a conversion table is established based on the original roll gap corresponding to each gear position and the ideal height corresponding to each gear position. In this conversion table, the ideal height of the corresponding step block 52 can be directly looked up using the original roll gap size, or the ideal height of the corresponding step block 52 can be looked up using the set gear position. In other embodiments, a conversion table between the original roll gap and the ideal height can also be directly established without setting the corresponding gear position.

[0084] 2. Drive step block 2 (52) to the ideal height. The specific process is as follows: First, set the retraction distance d1 and the alarm action distance d2, where d1 > d2 ≥ d1. max The system determines whether the real-time roll gap d is less than a preset roll retraction distance d1. If so, a pressure relief signal is sent to the hydraulic device, causing the movable roll to be pushed away from the fixed roll by the reaction force of the material, thereby driving the movable roll bearing seat away from the fixed roll bearing seat until d > d1. Otherwise, when d > d1, a drive signal is sent to the drive mechanism until the drive mechanism drives the step block two to the ideal height h. w Then, a stop signal is sent to the drive mechanism, and the drive mechanism stops running.

[0085] During the process of the driving mechanism driving the second stepped block to move, due to the instability of the particle size and feeding rate of the material itself, the movable roller swings to both sides under the action of the reaction force of the material and the driving force of the hydraulic device. In order to ensure that there is no collision interference between the second stepped block and the first stepped block during the adjustment of the original roll gap, it is also necessary to judge whether the real-time roll gap d is less than the warning action distance d2. If so, an alarm signal is generated and a shutdown signal is sent to the driving mechanism, and then a pressure relief signal is sent to the hydraulic device until d < d1, and then a driving signal is continuously sent to the driving mechanism until the second stepped block reaches the ideal height. Finally, a pressurization signal is sent to the hydraulic device until the hydraulic device is pressurized to the initial set value.

[0086] The roll press for automatically adjusting the original roll gap in this embodiment can automatically adjust the original roll gap according to the set original roll gap. The adjustment process is as follows: First, the user sets the safety distance d1 and the roll-back alarm distance d2 by himself. When the user needs to adjust the original roll gap between the two rollers of the roll press, the user sets the target gear k of the second stepped block 52 in the controller and starts the original roll gap gear adjustment program. The controller controls the hydraulic device 4 to gradually relieve pressure. Since the pressure of the hydraulic device 4 decreases, the movable roller 31 cannot extrude the material, and the movable roller 31 is pushed open by the reaction force of the material and rolls back. At this time, the displacement sensor detects the position of the movable roller bearing seat 3, and stops relieving pressure after confirming that the distance of the movable roller bearing seat 3 reaches the safety distance d1. When adjusting the position of the second stepped block 52, it is necessary to ensure stable feeding of the roll press to prevent the reaction force of the material from suddenly decreasing, resulting in a sudden decrease in the roll gap between the two rollers. If the reaction force of the material suddenly decreases and causes the movable roller bearing seat 3 to reach the roll-back alarm distance d2, the hydraulic device 4 will be triggered to relieve pressure again and roll back to d1.

[0087] Secondly, after the movable roller bearing seat 3 moves to the roll-back safety distance d1, the controller controls the motor 533 to rotate,带动 the worm and gear reducer 5322 to rotate, and then带动 the trapezoidal screw rod 5311 to rotate. Since the trapezoidal screw rod 5311 is in threaded配合 with the second stepped block 52, it can drive the second stepped block 52 to move longitudinally along the trapezoidal screw rod 5311. By controlling the forward and reverse rotation of the motor 533, the up and down movement of the second stepped block 52 can be实现. When the displacement sensor 1 detects that the second stepped block 52 reaches the ideal height corresponding to the set target gear K, the controller controls the motor 533 to stop rotating, and the adjustment of the original roll gap gear is completed.

[0088] Finally, the hydraulic device 4 is gradually pressurized to恢复 to the working pressure before pressure relief, and the roll-back alarm position d2 no longer起作用.

[0089] The roll press in this embodiment can adjust the original roll gap without停机, which not only reduces the manual labor intensity, but also提高 the efficiency of adjusting the original roll gap and meets the needs of industrial production.

[0090] Embodiment 2

[0091] This embodiment provides a method for adjusting the initial roll gap of a roller press, which can be applied to the roller press with automatic initial roll gap adjustment in Embodiment 1. Please refer to... Figure 7 This is a flowchart illustrating the initial roll gap adjustment method for the roller press in this embodiment. The initial roll gap adjustment method includes the following steps:

[0092] S1: Obtain the height h and real-time roll gap d of the second stepped block 52 of the roller press. Both the height h and the real-time roll gap d of the second stepped block 52 can be detected in real time by a displacement sensor.

[0093] S2: Calculate the ideal height h of the corresponding stepped block 252 based on the set target original roll gap. w The specific calculation method is as follows:

[0094] S21: Based on the set target original roll gap d p Once the corresponding gear is calculated, the gear k is expressed as:

[0095] k=[(d p -d min )×(n-1) / (d max -d min )+1

[0096] In the formula, d min d is the minimum value of the original roll gap. max is the maximum value of the original roll gap, and n is the total number of gaps;

[0097] S22: Calculate the ideal height of step block 52 based on gear position k; if step block 52 is a positive step, then the ideal height is expressed as:

[0098] h wk =h0+(k-1)h s ;

[0099] If step block 252 is a reverse step, then the ideal height is expressed as:

[0100] h wk =h0-(k-1)h s ;

[0101] In the formula, h wk h0 is the ideal height corresponding to the k-th gear, h0 is the initial height of step block 52, and h s The height of each step in step block 252.

[0102] S3: Drive step block 2 52 to the ideal height. First, set the retraction distance d1 and alarm action distance d2, where d1 > d2 ≥ d1. maxThe system determines whether the real-time roll gap d is less than a preset roll retraction distance d1. If so, a pressure relief signal is sent to the hydraulic device, causing the movable roll to be pushed away from the fixed roll by the reaction force of the material, thereby driving the movable roll bearing seat away from the fixed roll bearing seat until d > d1. Otherwise, when d > d1, a drive signal is sent to the drive mechanism until the drive mechanism drives the step block two to the ideal height h. w Then, a stop signal is sent to the drive mechanism, and the drive mechanism stops running.

[0103] During the movement of the second step block driven by the drive mechanism, due to the instability of the material particle size and feeding rate, the movable roller swings to both sides under the action of the material reaction force and the driving force of the hydraulic device. To ensure that the second step block and the first step block do not collide or interfere during the initial roller gap adjustment, it is also necessary to determine whether the real-time roller gap d is less than the alarm action distance d2. If so, an alarm signal is generated and a stop signal is sent to the drive mechanism, followed by a pressure relief signal to the hydraulic device. After d > d1, a drive signal is sent to the drive mechanism until the second step block reaches the ideal height. Finally, a pressurization signal is sent to the hydraulic device until the hydraulic device pressurizes to the initial set value.

[0104] In other embodiments, the second step block 52 can also be driven to the ideal height by the following method: First, determine whether the current roll gap size interferes with the movement of the second step block 52. That is, during the movement of the second step block 52, a gap should always be maintained between the second step block 52 and the first step block 51 to prevent collisions between them. Specifically, determine whether the roll gap d is greater than the ideal roll gap d. w And make the following decision: a. When d > d w At that time, a drive signal is sent to the drive mechanism 53 until the second step block 52 reaches the ideal height h. w .

[0105] b. When d≤d w At that time, a pressure relief signal is sent to hydraulic device 4 until d > d w After the hydraulic device 4 is depressurized, its driving force on the movable roller bearing seat 3 decreases. Therefore, with the material feeding rate remaining constant, the movable roller bearing seat 3 moves away from the fixed roller bearing seat 2, and the roller gap widens accordingly. A driving signal is then sent to the drive mechanism 53 until the stepped block 52 reaches the ideal height h. w .

[0106] Among them, the ideal roll gap d w It can be represented as:

[0107] d w =d p + ;

[0108] In the formula, The error distance is set manually.

[0109] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A roll press capable of automatically adjusting the original roll gap, comprising a frame, a fixed roll bearing seat, a movable roll bearing seat and a hydraulic device; the fixed roll bearing seat is fixedly connected with the frame; a sliding groove is formed in the frame for the movable roll bearing seat to slide; the movable roll bearing seat is opposite to the fixed roll bearing seat; the hydraulic device is used to drive the movable roll bearing seat to slide in the sliding groove, so that the movable roll bearing seat is close to or away from the fixed roll bearing seat; the distance between the movable roll bearing seat and the fixed roll bearing seat is defined as the roll gap; the minimum distance between the movable roll bearing seat and the fixed roll bearing seat that can be reached when the roll press is running is defined as the original roll gap; characterized in that, The roller press further comprises: The original roll gap adjusting device comprises a step block one, a step block two and a driving mechanism; the step block one is fixedly connected on the fixed roll bearing seat; the step block two is slidably connected with the movable roll bearing seat in the vertical direction; the driving mechanism is fixedly connected on the movable roll bearing seat and used for driving the step block two to ascend and descend; the step block two and the step block one are both provided with n steps with same structure, and the step surfaces of the step block two are oppositely arranged with the step surfaces of the step block one and reversely arranged in up and down directions; the height of the step is defined as h s The step block two is defined as the first gear when the step block two is arranged at the same height with the step block one; if the step block two is the forward step, the step block two is defined as the i+1 gear when the step block two ascends i h s ; if the step block two is the reverse step, the step block two is defined as the i+1 gear when the step block two descends i h s ; wherein, i∈{1,2,3,……,n-1}. a plurality of displacement sensors respectively configured to detect a real-time height h and a real-time roll gap d of the second stepped block; and A controller is configured to: (1) query and obtain an ideal height h of the stepped block two from a preset conversion table according to a preset target raw roll gap w ; the conversion table is configured to represent a mapping relationship between the raw roll gap and the ideal height; and (2) control the driving mechanism to drive the stepped block two to the ideal height; the specific process is as follows: judging whether the real-time roll gap d is less than a preset roll-off distance d1, if yes, sending a pressure relief signal to the hydraulic device until d>d1; otherwise, sending a driving signal to the driving mechanism until the stepped block two reaches the ideal height h w .

2. The roll press for automatically adjusting a raw roll gap according to claim 1, wherein, During the movement of the second stepped block driven by the driving mechanism, it is determined whether the real-time roll gap d is less than a preset alarm action distance d2, and if so, an alarm signal is generated and a stop signal is sent to the driving mechanism, then a pressure relief signal is sent to the hydraulic device until d>d1, and the driving signal is continuously sent to the driving mechanism until the second stepped block reaches the ideal height; finally, a pressure increasing signal is sent to the hydraulic device until the hydraulic device is pressurized to the initial set value; wherein d2 3. The roll press automatically adjusting a raw roll gap according to claim 1, wherein, The movable roller bearing seat is fixedly connected with a guide rail arranged in the vertical direction, and the second stepped block is provided with a sliding groove in sliding connection with the guide rail.

4. The roll press automatically adjusting a raw roll gap according to claim 1, wherein, The driving mechanism comprises a lead screw assembly, a motor and a worm gear assembly, the lead screw assembly comprises a lead screw and two bearings; the two bearings are opposite to each other and are fixedly connected to the movable roller bearing seat; the two ends of the lead screw pass through the two bearings and are fixedly connected to the two bearings; the second stepped block is provided with an internal thread matched with the lead screw; the worm gear assembly comprises a worm gear and a worm; the worm gear is coaxially arranged with the lead screw and is fixedly connected to one end of the lead screw; the worm is in meshing connection with the worm gear; the motor is fixedly connected to the movable roller bearing seat, and the output shaft of the motor is fixedly connected with the worm for driving the worm to rotate.

5. A roll press for automatically adjusting a raw roll gap according to claim 4, characterized in that, The two bearings are respectively in upper and lower limit positions, so that the second stepped block is always between the first gear and the nth gear.

6. The roll press automatically adjusting a raw roll gap according to claim 4, wherein, The lead screw is a trapezoidal lead screw; the trapezoidal lead screw and the second stepped block form a trapezoidal lead screw assembly.

7. The roll press automatically adjusting a raw roll gap according to claim 1, wherein, The width of the step is set by the following method:

1. Set the minimum value d min and the maximum value d max of the original roll gap according to the size of the material suitable for the roll press; 2. Set n gears, corresponding to the width d s of the step. d s =(d max -d min ) / (n-1),k=1,2,3,……n。 8. A roll press with automatically adjusted original roll gap according to claim 7, characterized in that, The conversion table is established by the following method: first, calculating the ideal height h of the step block two at each gear position w : obtaining the height h of each step s and the initial height h0 of the step block two; if the step block two is a positive step, the ideal height h corresponding to each gear position is expressed as: w ​ h wk = h0+ (k-1) h s ; If the stepped block two is a reverse step, the ideal height h corresponding to each gear position is w Expressed as: h wk = h0- (k-1) h s ; In the formula, h wk is the ideal height of the kth gear Secondly, the original roll gap corresponding to each gear is calculated; the original roll gap is expressed as: d mink =(k-1)×(d max -d min ) / (n-1) +d min ; In the formula, d mink is the original roll gap corresponding to the kth gear; Finally, the conversion table is established according to the original roll gap corresponding to each gear and the ideal height.

9. A method for adjusting the original roll gap of a roll press, which is applied to the roll press for automatically adjusting the original roll gap according to any one of claims 1 to 8, characterized in that, The original roll gap adjusting method comprises the following steps: S1: obtaining the real-time height h and the real-time roll gap d of the second stepped block of the roller press; S2: calculate the ideal height h of the corresponding step block two according to the set target original roller gap w The specific calculation method is as follows: S21 : according to the target original roll gap d p The corresponding gear is calculated, and the gear k is expressed as: k=[ (d p -d min ) x (n-1) / (d max -d min ) ] + 1; where d min is the minimum value of the original roll gap, d max is the maximum value of the original roll gap, n is the total number of gears S22: calculating the ideal height of the second stepped block according to the gear k; if the second stepped block is a forward stepped block, the ideal height is expressed as: h wk = h0+ (k-1) h s ; If the second stepped block is a reverse stepped block, the ideal height is expressed as: h wk = h0- (k-1) h s ; In the formula, h wk is the ideal height corresponding to the kth gear, h0is the initial height of the second stepped block, h s is the height of each step of the second stepped block; S3: controlling the driving mechanism to drive the second stepped block to a desired height; the specific process is as follows: judging whether the real-time roll gap d is less than a preset roll-off distance d1; if yes, sending a pressure relief signal to the hydraulic device until d>d1; otherwise, sending a driving signal to the driving mechanism until the second stepped block reaches the desired height h w .

10. The method of claim 9, wherein the original roll gap of the roll press is adjusted by, In step S3, the following method is used to drive the second stepped block to the desired height: determine whether the real-time roll gap d is greater than the desired roll gap d w , and make the following decisions: a, when d>d w , send a driving signal to the driving mechanism until the second stepped block reaches the desired height h w ; b, when d≤d w , send a pressure relief signal to the hydraulic device until d>d w ; then send a driving signal to the driving mechanism until the second stepped block reaches the desired height h w ; finally, send a pressure increase signal to the hydraulic device until the hydraulic device is pressurized to the initial set value; wherein the desired roll gap d w is expressed as: d w =d p + ; In the formula, An artificially set error distance.

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