A control method for abnormal vibration of a roller press

Abstract

The present invention belongs to the field of mechanical equipment, and particularly relates to a control method for abnormal vibration of a roller press. The control method comprises the following steps: S1: Preset maximum effect coefficients for rotational speed adjustment, feed rate adjustment, and hydraulic pressure adjustment respectively. S2: Real-time collect the initial vibration deviation degree of the roller press, and perform primary regulation when the initial vibration deviation degree is higher than the target deviation degree. S3: Only adjust the rotational speed of the roller press in the primary regulation stage, and perform secondary regulation if the regulation is unsuccessful. S4: Only adjust the real-time feed rate of the roller press in the secondary regulation stage, and perform final regulation if the secondary regulation is unsuccessful. S5: Adjust the hydraulic pressure in the final regulation process. During each level of regulation process, the product of the maximum effect coefficient and the vibration deviation degree is used as the target adjustment amount, and then the amplitude of adjustment of each index is obtained by querying the single control rule table. The present invention can solve the problem of abnormal vibration caused by various factors in the existing roller press.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical equipment, and particularly relates to a control method for abnormal vibration of a roller press. Background Art

[0002] A roller press, also known as an extrusion mill, a roller press mill or a pair of rollers machine, is a highly efficient grinding equipment. In the raw meal grinding process, since there are no special requirements for the particle morphology of the raw meal grinding finished product in the downstream process, a roller press finish grinding system can be used; in the cement grinding process, since the downstream commercial concrete mixing station has requirements for the particle morphology of the cement grinding finished product, most of them adopt the configuration of a roller press pre-grinding plus a ball mill. The roller press extrudes and crushes large particles and generates a large number of internal cracks, and then the ball mill finely grinds the finished product of the roller press to meet the requirements of particle size and particle morphology. Since the working efficiency of the roller press is relatively high, it has been widely used in both the raw meal grinding and cement grinding processes. During the grinding process, parameters such as the pressure, roll gap, and rotation speed of the equipment need to be preset according to the physical properties of the raw materials. When the physical properties of the raw materials change, it is necessary to timely adjust the settings of parameters such as the pressure, roll gap, and rotation speed of the roller press to ensure the stability of production and the safety of the equipment.

[0003] In the existing cement grinding system, when the roller press vibrates, the on-site operator will suppress the vibration by adjusting the production, such as reducing the feed rate and lowering the pressure value. If the DCS system is set with operation protection for the equipment, it is also possible to achieve real-time suppression of the vibration of the roller press through automatic detection and automatic control means.

[0004] The application scenarios of the roller press equipment are different during the working process, and the properties of the processed materials vary greatly. Therefore, the reasons for the equipment vibration are often diverse. On this basis, the best control methods for different types of jitters should also be different. The existing equipment vibration suppression control methods usually only adjust a single equipment operation parameter and adopt a simple negative feedback control logic, and the control strategy is relatively monotonous and does not have self-adaptability. Therefore, when dealing with the equipment vibration problems caused by different properties of materials, there may be phenomena of poor control effect and lagging control effect. In extreme cases, inappropriate control strategies may even indirectly cause the roller press to gradually become unstable and damaged.

[0005] The abnormal vibration of the roller press will cause equipment shutdown, discontinuous production, reduced production efficiency, and increased costs. Therefore, how to effectively suppress equipment vibration is an important means to improve the operation stability and continuity of the roller press. However, the effects of various vibration suppression means in the prior art are still difficult to meet the requirements. Summary of the Invention

[0006] To solve the problem that the vibration suppression effect of the conventional single-parameter regulation strategy adopted in the existing roller presses is poor, resulting in insufficient equipment stability and continuity, the present invention provides a control method for abnormal vibration of a roller press.

[0007] The present invention is implemented by the following technical solutions:

[0008] A control method for abnormal vibration of a roller press, the control method comprising the following steps:

[0009] S1: Preset the maximum effect coefficients δ 1max , δ 2max , δ 3max respectively for rotational speed regulation, feed rate regulation, and hydraulic pressure regulation. The effect coefficient is used to characterize the proportional coefficient that can achieve the best regulation effect in the actual regulation process for different regulation methods, and this value is a value determined based on the data measured in simulation experiments.

[0010] S2: Real-time collect the initial vibration offset Sh0 of the roller press, and perform the following primary regulation on the roller press when the initial vibration offset Sh0 is higher than the target offset.

[0011] S3: Only adjust the rotational speed v of the roller press in the primary regulation stage, and the regulation process is as follows:

[0012] S31: Take the product of the maximum effect coefficient δ 1max of rotational speed regulation and the initial vibration offset Sh0 as the first target adjustment amount.

[0013] S32: Query a preset rotational speed single-control rule table according to the first target adjustment amount, and then generate the required rotational speed adjustment amplitude Δv.

[0014] S33: Reduce the real-time rotational speed v of the roller press according to the rotational speed adjustment amplitude Δv.

[0015] S34: Collect the preliminary adjustment vibration offset Sh1 of the roller press after the rotational speed adjustment; judge whether the preliminary adjustment vibration offset Sh1 is lower than the target offset:

[0016] (1) If so, complete the vibration suppression task and end the adjustment process.

[0017] (2) Otherwise, perform the following secondary regulation.

[0018] S4: Only adjust the real-time feed rate m of the roller press in the secondary regulation stage, and the regulation process is as follows:

[0019] S41: Take the product of the maximum effect coefficient δ 2max of feed rate regulation and the preliminary adjustment vibration offset Sh1 as the second target adjustment amount.

[0020] S42: Query a preset single-control rule table for the feed rate according to the second target adjustment amount, and then generate the required real-time feed rate adjustment amplitude Δm.

[0021] S43: Reduce the real-time feed rate m of the roller press according to the real-time feed rate adjustment amplitude Δm.

[0022] S44: Collect the secondary adjustment vibration offset Sh2 of the roller press after the real-time feed rate adjustment; determine whether the secondary adjustment vibration offset Sh2 is lower than the target offset:

[0023] (1) If yes, complete the vibration suppression task and end the adjustment process.

[0024] (2) Otherwise, perform the final-stage regulation of the next step.

[0025] S5: Only adjust the hydraulic pressure d of the roller press in the final-stage regulation stage, and the regulation process is as follows:

[0026] S51: Take the product of the maximum effect coefficient δ 3max of the hydraulic pressure adjustment and the secondary adjustment vibration offset Sh2 as the third target adjustment amount.

[0027] S52: Query a preset single-control rule table for the hydraulic pressure according to the third target adjustment amount, and then generate the required hydraulic pressure adjustment amplitude Δd.

[0028] S53: Reduce the hydraulic pressure d of the roller press according to the hydraulic pressure adjustment amplitude Δd.

[0029] S54: Collect the final adjustment vibration offset Sh3 of the roller press after the hydraulic pressure adjustment; determine whether the final adjustment vibration offset Sh3 is lower than the target offset:

[0030] (1) If yes, complete the vibration suppression task and end the adjustment process.

[0031] (2) Otherwise, return to step S3 to perform the next round of regulation.

[0032] Among them, the vibration offset Sh represents the proportion of the excess part relative to the maximum allowable vibration speed when the real-time vibration speed of the roller press is greater than the maximum allowable vibration speed. That is:

[0033]

[0034] The rotational speed adjustment amplitude Δv represents the change amount of the adjusted target rotational speed relative to the current rotational speed. The real-time feed rate adjustment amplitude Δm represents the change amount of the adjusted target real-time feed rate relative to the current real-time feed rate. The hydraulic pressure adjustment amplitude Δd represents the change amount of the adjusted target hydraulic pressure relative to the current hydraulic pressure.

[0035] As a further improvement of the present invention, in step S1, the value ranges of the effect coefficients of rotational speed adjustment, feed rate adjustment, and hydraulic pressure adjustment are respectively: δ1 ∈ [0.47, 0.65], δ2 ∈ [0.14, 0.32], δ3 ∈ [0.10, 0.16].

[0036] The maximum effect coefficient δ 1max , δ 2max , δ 3max Select the maximum value of each effect coefficient, or select the optimal value from the value range of the effect coefficient according to expert experience in different application scenarios.

[0037] As a further improvement of the present invention, in step S2, the vibration offset of the roller press is detected by an acceleration sensor, and the upper limit of the target offset is set to 2%.

[0038] As a further improvement of the present invention, in step S3, the rotational speed of the main shaft motor of the roller press is controlled and adjusted by the PLC and frequency converter of the main shaft motor of the roller press.

[0039] As a further improvement of the present invention, in step S32, the rotational speed single-control rule table is used to represent the rotational speed adjustment ratio V corresponding to different first target adjustment amounts Sh during the vibration of the roller press rate , and the two satisfy the following functional relationship:

[0040]

[0041] Wherein,

[0042] The rotational speed amplitude modulation Δv = V rate × the current rotational speed v of the roller press.

[0043] As a further improvement of the present invention, the real-time feed rate of the roller press is adjusted by adjusting the opening degree of the flap valve of the roller press to complete the corresponding amplitude adjustment.

[0044] As a further improvement of the present invention, in step S42, the feed rate single-control rule table is used to represent the adjustment ratio M of the real-time feed rate corresponding to different second target adjustment amounts Sh during the vibration of the roller press rate , and the two satisfy the following functional relationship:

[0045]

[0046] Wherein,

[0047] The real-time feed rate amplitude modulation Δm = M rate × the current real-time feed rate m of the roller press.

[0048] As a further improvement of the present invention, in step S5, the hydraulic pressure of the roller press is dynamically adjusted by a hydraulic control system.

[0049] As a further improvement of the present invention, in step S52, the hydraulic pressure single-control rule table is used to characterize the hydraulic pressure adjustment ratio D corresponding to different third target adjustment amounts Sh during the vibration process of the roller press rate , and the two satisfy the following functional relationship:

[0050]

[0051] wherein,

[0052] The hydraulic pressure amplitude modulation Δd = D rate × the current hydraulic pressure d of the roller press.

[0053] The technical solution provided by the present invention has the following beneficial effects:

[0054] The present invention designs a new control method for abnormal vibration of the roller press aiming at the body vibration of the roller press caused by different types of reasons. This control method adjusts the operating parameters of the roller press by means of multi-parameter hierarchical regulation; and designs a new regulation logic relative to the single-parameter control scheme; this control method can achieve the best precise adjustment effect under different abnormal states. And it significantly shortens the adjustment period for the roller press to return to the stable state.

[0055] The control method for abnormal vibration of the roller press provided by the present invention can detect the abnormal state of the roller press in real time, intervene from the early stage of the instability of the roller press, and realize regulation as early as possible. At the same time, combined with the new control method designed by the present invention, the abnormal state of the equipment is precisely adjusted, so as to ensure that the roller press can always be in the best operating state, reduce the failure rate of the equipment, ensure the continuity of production, and improve the product processing efficiency under the condition of unit energy consumption of the equipment.

[0056] In particular, by adopting the control method provided by the present invention, the stable operation of the roller press system can be effectively guaranteed, and the continuity of production can be improved. At the same time, this regulation method also keeps the current stable during the operation process of the equipment without large fluctuations, so the operation power consumption of the equipment can be effectively reduced. For the roller press equipment that needs to operate at high power for a long time, the application of this control system can significantly reduce the operation cost of the equipment and generate considerable economic value. Description of the Drawings

[0057] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification, and are used to explain the present invention together with the embodiments of the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0058] Figure 1 is the step flow chart of the control method for abnormal vibration of the roller press provided in Embodiment 1 of the present invention.

[0059] Figure 2 It is the system framework diagram of the automatic control system for abnormal vibration of the roller press provided in Embodiment 2 of the present invention.

[0060] Figure 3 It is the functional schematic diagram of the automatic control system for abnormal vibration of the roller press provided in Embodiment 2 of the present invention.

[0061] Figure 4 It is the change curve of the vibration amount during the operation of the roller press in Embodiment 3 of the present invention.

[0062] Figure 5 It is the change curve of the feeding amount during the operation of the roller press in Embodiment 3 of the present invention.

[0063] Figure 6 It is the change curve of the hydraulic pressure during the operation of the roller press in Embodiment 3 of the present invention.

[0064] Figure 7 It is the change curve of the roll gap during the operation of the roller press in Embodiment 3 of the present invention.

[0065] Figure 8 It is the change curve of the equipment current during the operation of the roller press in Embodiment 3 of the present invention. Detailed implementation manners

[0066] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0067] Embodiment 1

[0068] This embodiment provides a control method for abnormal vibration of a roller press. This method mainly aims at the body vibration problem that occurs during the actual operation of the roller press. Generally speaking, during the operation of the roller press, the two rollers will run at a preset speed; so that the processing capacity of the roller press is adapted to the feeding rate of the feeding mechanism. At the same time, the hydraulic pressure of the roller press usually also maintains a preset optimal state and works at a constant pressure; the above parameters jointly ensure the stable operation of the equipment. When the roller press is working, the material passes between the two rollers and is squeezed into powder under the pressure of the two rollers.

[0069] However, when there are significant fluctuations in the feeding situation of the equipment, it will lead to a mismatch between the feeding situation and the processing capacity under the preset parameters of the equipment, thereby causing the abnormal working state of the equipment. Under the condition of the fuselage vibration state, the grinding effect of the roller press will be significantly deteriorated, and the processing rate of the material will be reduced; and it will lead to an increase in the power of the roller press, increasing the equipment power consumption. Of course, if the roller press is in an abnormal vibration state for a long time during operation, it may also cause damage to the equipment body. In severe cases, it may even lead to the scrapping of the roller press. Therefore, it is very necessary to suppress the short-time vibration phenomenon of the roller press during operation.

[0070] The existing methods mainly adjust the operation state of the equipment through various single parameters to overcome the instantaneous jitter phenomenon. This method has obvious regulation effects in some targeted abnormal states and can quickly restore the fuselage to normal. However, if the regulation method is improper, it may instead exacerbate the abnormality of the equipment. And this embodiment provides a multi-parameter control method and designs a new regulation logic for different regulation means; thereby realizing the rapid solution of the fuselage vibration problem caused by various abnormal phenomena; having very high practical value.

[0071] Specifically, the control method for the abnormal vibration of the roller press provided in this embodiment is as Figure 1 shown and includes the following steps:

[0072] S1: Preset the maximum effect coefficients δ 1max 、δ 2max 、δ 3max for the rotational speed adjustment, the feed rate adjustment, and the hydraulic pressure adjustment respectively. The effect coefficient is used to characterize the proportional coefficient that can achieve the best regulation effect in the actual adjustment process of different regulation methods. This value is an expert experience value determined based on the data measured from simulation experiments.

[0073] The probabilities of occurrence of the abnormal problems targeted by different regulation methods in actual applications are different. At the same time, when different abnormal problems lead to the fault state of the fuselage vibration, each regulation means can often have an impact, but the effects on suppressing the fuselage jitter are different, and the adjustment ranges that can produce the best regulation effect are also different. In view of this characteristic, this embodiment determines the proportional coefficients that can produce the best regulation effect in actual applications for various regulation means by combining simulation and real test measurement methods, and defines this coefficient as the effect coefficient δ.

[0074] In this embodiment, the value ranges of the effect coefficients δ1, δ2, and δ3 for the rotational speed adjustment, the feed rate adjustment, and the hydraulic pressure adjustment are respectively: δ1 ∈ [0.47, 0.65], δ2 ∈ [0.14, 0.32], δ3 ∈ [0.10, 0.16]. The preset maximum effect coefficients δ 1max 、δ 2max 、δ 3maxThe maximum value of each effect coefficient can be selected, or the optimal value can be selected from the value range of the effect coefficient according to expert experience in different application scenarios.

[0075] S2: Real-time collect the initial vibration deviation Sh0 of the roller press. When the initial vibration deviation Sh0 is higher than the target deviation, perform the next-step primary regulation on the roller press.

[0076] The vibration deviation Sh represents the ratio of the excess part relative to the maximum allowable vibration speed when the real-time vibration speed of the roller press is greater than the maximum allowable vibration speed.

[0077] The calculation formula is as follows:

[0078]

[0079] In this embodiment, the vibration deviation of the roller press is detected by an acceleration sensor. The target deviation represents the desired vibration deviation of the equipment set manually, and the target deviation is the threshold for triggering regulation; the upper limit of the target deviation set manually is 2%. That is: in the regulation logic of this embodiment, if the vibration deviation of the roller press reaches more than 2%, the equipment needs to be regulated, and if it is lower than 2%, it is considered that the equipment is still in a safe state.

[0080] S3: Only adjust the rotation speed v of the roller press in the primary regulation stage. The regulation process is as follows:

[0081] S31: Take the product of the maximum effect coefficient δ 1max of the rotation speed adjustment and the initial vibration deviation Sh0 as the first target adjustment amount.

[0082] S32: Query a preset rotation speed single-control rule table according to the first target adjustment amount, and then generate the required rotation speed adjustment amplitude Δv. The rotation speed adjustment amplitude Δv represents the change amount of the adjusted target rotation speed relative to the current rotation speed.

[0083] The rotation speed single-control rule table is used to characterize the rotation speed adjustment ratio V rate corresponding to different first target adjustment amounts Sh during the vibration process of the roller press.

[0084] Table 1: Rotation speed single-control rule table for the vibration suppression process of the roller press

[0085]

[0086] The rotation speed single-control rule table can also be expressed as the following functional relationship:

[0087]

[0088] Among them,

[0089] the rotation speed adjustment amplitude Δv = Vrate The current rotational speed v of the roller press.

[0090] S33: Reduce the real-time rotational speed v of the roller press according to the rotational speed amplitude adjustment Δv.

[0091] S34: Collect the initial adjustment vibration offset Sh1 of the roller press after the rotational speed adjustment; determine whether the initial adjustment vibration offset Sh1 is lower than the target offset:

[0092] (1) If yes, complete the vibration suppression task and end the adjustment process.

[0093] (2) Otherwise, perform the secondary regulation in the next step.

[0094] S4: Only adjust the real-time feed rate m of the roller press during the secondary regulation stage, and the regulation process is as follows:

[0095] S41: Take the product of the maximum effect coefficient δ of the feed rate adjustment 2max and the initial adjustment vibration offset Sh1 as the second target adjustment amount.

[0096] S42: Query a preset single-control rule table for the feed rate according to the second target adjustment amount, and then generate the required real-time feed rate amplitude adjustment Δm. The real-time feed rate amplitude adjustment Δm represents the change amount of the adjusted target real-time feed rate relative to the current real-time feed rate.

[0097] The single-control rule table for the feed rate is used to characterize the adjustment ratio M of the real-time feed rate corresponding to different second target adjustment amounts Sh during the vibration process of the roller press rate . The chart form of the single-control rule table for the feed rate is shown in Table 2 below:

[0098] Table 2: Single-control rule table for the feed rate in the vibration suppression process of the roller press

[0099]

[0100] The single-control rule table for the feed rate can also be expressed as the following functional relationship:

[0101]

[0102] Among them,

[0103] The real-time feed rate amplitude adjustment Δm = M rate × the current real-time feed rate m of the roller press.

[0104] S43: Lower the real-time feed rate m of the roller press according to the real-time feed rate amplitude adjustment Δm.

[0105] S44: Collect the secondary adjustment vibration offset Sh2 of the roller press after the real-time feed rate adjustment; determine whether the secondary adjustment vibration offset Sh2 is lower than the target offset:

[0106] (1) If the vibration suppression task is completed, the adjustment process ends.

[0107] (2) Otherwise, perform the final-stage regulation of the next step.

[0108] S5: During the final-stage regulation, only adjust the hydraulic pressure d of the roller press. The regulation process is as follows:

[0109] S51: Take the product of the maximum effect coefficient δ of the hydraulic pressure adjustment 3max and the secondary-adjustment vibration offset Sh2 as the third target adjustment amount.

[0110] S52: Query a preset hydraulic pressure single-control rule table according to the third target adjustment amount, and then generate the required hydraulic pressure amplitude adjustment Δd. The hydraulic pressure amplitude adjustment Δd represents the change amount of the target hydraulic pressure after adjustment relative to the current hydraulic pressure.

[0111] The hydraulic pressure single-control rule table is used to characterize the hydraulic pressure adjustment ratio D corresponding to the third target adjustment amount Sh during the vibration process of the roller press rate . The chart form of the hydraulic pressure single-control rule table is shown in Table 3 below:

[0112] Table 3: Hydraulic pressure single-control rule table for the vibration suppression process of the roller press

[0113]

[0114] The hydraulic pressure single-control rule table can also be expressed as the following functional relationship:

[0115]

[0116] Among them,

[0117] The hydraulic pressure amplitude adjustment Δd = D rate × the current hydraulic pressure d of the roller press.

[0118] S53: Reduce the hydraulic pressure d of the roller press according to the hydraulic pressure amplitude adjustment Δd.

[0119] S54: Collect the final-adjustment vibration offset Sh3 of the roller press after the hydraulic pressure adjustment; determine whether the final-adjustment vibration offset Sh3 is lower than the target offset:

[0120] (1) If so, complete the vibration suppression task and end the adjustment process.

[0121] (2) Otherwise, return to step S3 to perform the next round of regulation again.

[0122] It should be noted that the strategy adopted in this embodiment is a multi-parameter hierarchical regulation strategy, which is different from the synchronous strategy of multi-parameter fusion regulation. In this embodiment, the priorities of various regulation means are different; and the effect coefficient is also different from the weight coefficient in the multi-parameter fusion regulation scheme. An obvious difference is that the sum of the effect coefficients corresponding to various regulation means adopted in the scheme of this embodiment may not be 1. Another obvious advantage of using the effect coefficient of this embodiment to guide the regulation process is that it can avoid over-regulation of the equipment operating state.

[0123] Embodiment 2

[0124] This embodiment provides an automatic control system for abnormal vibration of a roller press. When the roller press has abnormal vibration, this system uses the control method for abnormal vibration of the roller press in Embodiment 1 to automatically regulate the abnormal vibration state during the equipment operation, so as to make the over-limit vibration state of the roller press return to stability.

[0125] As Figure 2 shown, the over-limit vibration control system provided in this embodiment includes: a vibration measurement mechanism, a roller speed adjustment mechanism, a feed adjustment mechanism, a hydraulic pressure adjustment mechanism, and a controller.

[0126] The vibration measurement mechanism is used to measure the vibration speed of the fuselage during the operation of the roller press in real time and calculate the vibration offset degree Sh corresponding to each moment. The roller speed adjustment mechanism is used to dynamically adjust the speed v of the main shaft motor of the roller press according to the received control instruction. The feed adjustment mechanism is used to dynamically adjust the real-time feed amount m of the electric feed device of the roller press according to the received control instruction. The hydraulic pressure adjustment mechanism is used to dynamically adjust the hydraulic pressure d of the roller press according to the received control instruction.

[0127] Specifically, the vibration measurement mechanism uses an acceleration sensor for measurement. The roller speed adjustment mechanism adjusts the speed of the main shaft motor of the roller press through a frequency converter. The feed adjustment mechanism adjusts the real-time feed amount of the roller press by controlling the opening degree of the flap valve of the roller press. The hydraulic pressure adjustment mechanism adjusts the hydraulic pressure of the roller press through a hydraulic control system.

[0128] Among them, the controller is electrically connected to the vibration measurement mechanism, the roller speed adjustment mechanism, the feed adjustment mechanism, and the hydraulic pressure adjustment mechanism. The controller is used to obtain the vibration offset degree Sh detected by the vibration measurement mechanism. And use the method in steps S1-S5 in Embodiment 1 to generate real-time control instructions sent to the roller speed adjustment mechanism, the feed adjustment mechanism, and the hydraulic pressure adjustment mechanism. Further achieve the purpose of dynamically adjusting the equipment speed, real-time feed amount, and hydraulic pressure according to the over-limit degree of the roller press vibration, so that the roller press can quickly return to stability.

[0129] Specifically, as Figure 3As shown in the figure, the controller of this embodiment includes a storage unit, a data acquisition unit, an overrun evaluation unit, a first regulation unit, a second regulation unit, and a third regulation unit. The data storage unit uses a FLASH memory or an EPROM memory with the performance of electronically erasable and programmable, which will not lose data due to power failure and can quickly read data.

[0130] The data storage unit is respectively used to store the preset maximum effect coefficients δ 1max , δ 2max , δ 3max during speed regulation, feed rate regulation, and hydraulic pressure regulation; the preset target offset; as well as the single-control rule tables for speed, feed rate, and hydraulic pressure. The above data are used as the system parameters of the automatic control system.

[0131] The data acquisition unit is used to obtain the real-time vibration offset Sh of the roller press measured by the vibration measuring mechanism.

[0132] The overrun evaluation unit is a comparator, which is used to evaluate in real time whether the current vibration state of the roller press is overrun according to the real-time vibration offset Sh of the roller press and the preset target offset.

[0133] The first regulation unit is used to calculate a corresponding speed adjustment amplitude Δv according to the real-time vibration offset Sh of the roller press, the maximum effect coefficient δ 1max of speed regulation, and the single-control rule table for speed when the roller press is in the initial state or still in the vibration overrun state after being regulated by the third regulation unit, and generate a control instruction for reducing the speed of the main shaft motor of the roller press by a corresponding amplitude.

[0134] The second regulation unit is used to calculate a corresponding real-time feed rate adjustment amplitude Δm according to the real-time vibration offset Sh of the roller press, the maximum effect coefficient δ 2max of feed rate regulation, and the single-control rule table for feed rate when the roller press is still in the vibration overrun state after being regulated by the first regulation unit, and generate a control instruction for reducing the feed rate of the roller press by a corresponding amplitude.

[0135] The third regulation unit is used to calculate a corresponding hydraulic pressure adjustment amplitude Δd according to the real-time vibration offset Sh of the roller press, the maximum effect coefficient δ 3max of hydraulic pressure regulation, and the single-control rule table for hydraulic pressure when the roller press is still in the vibration overrun state after being regulated by the second regulation unit, and generate a control instruction for reducing the hydraulic pressure of the roller press by a corresponding amplitude.

[0136] The process of generating instructions by the first regulation unit, the second regulation unit, and the third regulation unit is as follows:

[0137] (1) First, take the product of the real-time vibration offset and the maximum effect coefficient of each control index as the target adjustment amount of the vibration amount at the current stage.

[0138] (2) Then, use the target adjustment amount to query the single-control rule table of the corresponding control index to obtain the adjustment ratio of each control index.

[0139] (3) Next, take the product of the adjustment ratio of each control index and the measured value of the corresponding control index as the target amplitude adjustment of the control index at the current stage.

[0140] (4) Finally, generate corresponding control commands according to the amplitude adjustments of each control index.

[0141] It should be emphasized that the abnormal vibration problem of the body during the operation of the roller press is usually only a short-term phenomenon. When the fault factors causing the abnormality are eliminated, the roller press itself will slowly return to the normal state. Therefore, the automatic control system in this embodiment will only adjust the operating parameters of the roller press when the roller press has severe vibrations. When the roller press returns to normal and operates stably for a period of time, the system will also readjust the operating parameters of the roller press to the initial state. Or re-adjust the parameters according to the instructions of the technicians, so as to complete the grinding processing tasks of various materials.

[0142] Embodiment 3

[0143] This embodiment provides a roller press, which adopts the automatic control system for abnormal vibration of the roller press as in Embodiment 2. Therefore, during the operation, the method as in Embodiment 1 can be used to adaptively adjust the rotational speed of the main shaft motor, the real-time feed rate of the equipment, and the double hydraulic pressure according to its own operating state. Thus, the stable operation state of the equipment is maintained, and the abnormal vibration phenomenon of the body during the operation is suppressed.

[0144] To verify the effectiveness of the solution provided in this embodiment, historical data during the operation was downloaded from the roller press in this embodiment; and the vibration suppression process of the roller press in this embodiment was analyzed based on the data. Figure 4 The vibration curve of the roller press over a period of time is shown. Analyzing the curve in the figure, it can be seen that in the early stage, the fluctuation of the vibration speed of the roller press is large, and the vibration speed remains at a relatively high level, higher than 0.47 mm / s. However, after a period of adaptive adjustment, the vibration speed of the equipment returns to "calm" and remains at 0.37 - 0.38 mm / s, and the decrease in the vibration speed exceeds 19%. At the same time, analyzing the change curves of the feed rate, hydraulic pressure, and roll gap in the same period as Figures 5 - 7 shows that during the vibration suppression process of the equipment, the feed rate and hydraulic pressure were indeed appropriately reduced. Among them, the feed rate decreased from nearly 230 t / h to about 210 t / h; the hydraulic pressure decreased from about 8.50 mPa to about 7.80 mPa.Figure 7 In the curve of Figure 7 , there is no obvious linear relationship between the adjustment of the roll gap and the vibration amount of the equipment. The regulation process of this equipment is indeed consistent with the regulation ideas provided in Embodiments 1 and 2; and the reduction of equipment vibration also verifies the effectiveness of the regulation strategy in this embodiment.

[0145] In particular, observing the change trend of the current of the synchronous equipment as shown in Figure 8 Figure 8 , it can be seen that after the regulation of the automatic control system in this embodiment, on the premise that the system output and quality remain stable, the equipment current drops from nearly 80A in the early stage to about 75A in the late stage, that is, the goal of reducing the energy consumption of equipment operation is achieved. At the same time, analyzing the image can also find that: in the early stage of regulation, the fluctuation of the equipment current is relatively large, which is exactly the influence brought by the regulation process; it also reflects the conclusion that the operating current is related to the working state of the equipment and the amplitude of abnormal vibration.

[0146] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control method for abnormal vibration of a roller press, characterized in that It includes the following steps: S1: Preset the maximum effect coefficient δ for speed regulation, feed rate regulation and hydraulic pressure regulation respectively 1max , δ 2max , δ 3max , the effect coefficient is used to characterize the proportional coefficient of the best regulation effect that can be achieved by different regulation methods in the actual regulation process; S2: Real-time collect the initial vibration offset Sh0 of the roller press. When the initial vibration offset Sh0 is higher than the target offset, perform the primary regulation of the next step on the roller press; S3: During the primary regulation stage, only adjust the rotational speed v of the roller press. The regulation process is as follows: S31: Use the product of the maximum effect coefficient δ of the rotational speed adjustment 1max and the initial vibration offset Sh0 as the first target adjustment amount; S32: Query a preset rotational speed single-control rule table according to the first target adjustment amount, and then generate the required rotational speed adjustment amplitude Δv; S33: Reduce the real-time rotational speed v of the roller press according to the rotational speed adjustment amplitude Δv; S34: Collect the initially adjusted vibration offset Sh1 of the roller press after the rotational speed adjustment; Determine whether the initially adjusted vibration offset Sh1 is lower than the target offset: (1) If yes, complete the vibration suppression task and end the adjustment process; (2) Otherwise, perform the secondary regulation of the next step; S4: During the secondary regulation stage, only adjust the real-time feed rate m of the roller press. The regulation process is as follows: S41: Use the product of the maximum effect coefficient δ for regulating the feed rate 2max and the initial adjustment vibration offset Sh1 as the second target adjustment amount; S42: Query a preset feed rate single-control rule table according to the second target adjustment amount, and then generate the required real-time feed rate adjustment amplitude Δm; S43: Reduce the real-time feed rate m of the roller press according to the real-time feed rate adjustment amplitude Δm; S44: Collect the secondarily adjusted vibration offset Sh2 of the roller press after the real-time feed rate adjustment; Determine whether the secondarily adjusted vibration offset Sh2 is lower than the target offset: (1) If yes, complete the vibration suppression task and end the adjustment process; (2) Otherwise, perform the final regulation of the next step; S5: During the final regulation stage, only adjust the hydraulic pressure d of the roller press. The regulation process is as follows: S51: Take the product of the maximum effect coefficient δ of hydraulic pressure regulation 3max and the secondary adjustment vibration offset Sh2 as the third target adjustment amount; S52: Query a preset hydraulic pressure single-control rule table according to the third target adjustment amount, and then generate the required hydraulic pressure adjustment amplitude Δd; S53: Reduce the hydraulic pressure d of the roller press according to the hydraulic pressure adjustment amplitude Δd; S54: Collect the finally adjusted vibration offset Sh3 of the roller press after the hydraulic pressure adjustment; Determine whether the finally adjusted vibration offset Sh3 is lower than the target offset: (1) If yes, complete the vibration suppression task and end the adjustment process; (2) Otherwise, return to step S3 to perform the next round of regulation; Among them, the vibration offset Sh represents the proportion of the excess part exceeding the maximum allowable vibration speed when the real-time vibration speed of the roller press is greater than the maximum allowable vibration speed; the rotational speed adjustment amplitude Δv represents the change amount of the adjusted target rotational speed relative to the current rotational speed; the real-time feed rate adjustment amplitude Δm represents the change amount of the adjusted target real-time feed rate relative to the current real-time feed rate; the hydraulic pressure adjustment amplitude Δd represents the change amount of the adjusted target hydraulic pressure relative to the current hydraulic pressure; In step S32, the rotational speed single control rule table is used to characterize the rotational speed adjustment ratio V corresponding to different first target adjustment amounts Sh during the vibration of the roller press rate , and the two satisfy the following functional relationship: The rotational speed amplitude modulation Δv = V rate × the current rotational speed v of the roller press.

2. The control method for abnormal vibration of the roll press according to claim 1, characterized in that: In step S1, the value ranges of the effect coefficients of rotational speed adjustment, feed rate adjustment, and hydraulic pressure adjustment are respectively: δ1 ∈ [0.47, 0.65], δ2 ∈ [0.14, 0.32], δ3 ∈ [0.10, 0.16].

3. The control method for abnormal vibration of a roller press according to claim 2, characterized in that: The maximum effect coefficient δ 1max , δ 2max , δ 3max Select the maximum value of each effect coefficient, or select the optimal value from the value range of the effect coefficient according to expert experience in different application scenarios.

4. The control method for abnormal vibration of the roller press according to claim 1, characterized in that: In step S2, the vibration offset of the roller press is detected by an acceleration sensor; the target offset represents the expected vibration offset of the equipment set manually, and the target offset is the threshold for triggering regulation; and the upper limit of the target offset is set to 2%.

5. The control method for abnormal vibration of a roll press according to claim 1, characterized in that: In step S3, the rotational speed of the main shaft motor of the roller press is controlled and adjusted by the PLC and frequency converter of the main shaft motor of the roller press.

6. The control method for abnormal vibration of a roller press according to claim 1, characterized in that: In step S4, the real-time feed rate of the roll press is adjusted by corresponding amplitude by adjusting the opening degree of the flap valve of the roll press.

7. The control method for abnormal vibration of the roll press according to claim 1, characterized in that: In step S42, the single-control rule table for the feed rate is used to characterize the adjustment ratio M of the real-time feed rate corresponding to different second target adjustment amounts Sh during the vibration of the roller press rate , and the two satisfy the following functional relationship: Among them, The real-time feed rate amplitude modulation Δm = M rate × the current real-time feed rate m of the roller press.

8. The control method for abnormal vibration of the roll press according to claim 1, characterized in that: In step S5, the hydraulic pressure of the roll press is dynamically adjusted by the hydraulic control system.

9. The control method for abnormal vibration of the roller press according to claim 1, characterized in that: In step S52, the hydraulic pressure single control rule table is used to characterize the hydraulic pressure adjustment ratio D corresponding to different third target adjustment amounts Sh during the vibration of the roller press rate , and the two satisfy the following functional relationship: Among them, Hydraulic pressure amplitude modulation Δd = D rate × the current hydraulic pressure d of the roller press.

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