Digitally displayed pulping machine grinding disc gap monitoring system

Abstract

The invention relates to the technical field of pulping machines, and particularly discloses a digital display pulping machine grinding disc gap monitoring system, which comprises a mechanical transmission and indication unit, an electric measurement unit and a control unit, the mechanical transmission and indication unit comprises a movable seat, a guide key, a fixed plate, a scale and a cover plate; the guide key is mounted on the movable seat, the fixed plate is fixedly mounted on the guide key through a bolt, and the scale is fixedly mounted on the fixed plate; according to the invention, rapid and visual mechanical reading is carried out through the ruler, high-precision real-time digital feedback can be obtained from the digital display meter, and the reading convenience and accuracy are improved. Meanwhile, the linear displacement sensor is combined with a zero-adjustable scale, and is matched with an intelligent calibration algorithm of the control unit, so that a user can be automatically prompted to compensate for measurement errors caused by abrasion of the abrasive disc or can be prompted to compensate for the measurement errors caused by abrasion of the abrasive disc.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pulp refiners, and particularly relates to a digital display type pulp refiner plate gap monitoring system. BACKGROUND

[0002] In the field of pulp refiners, the gap between the plates is a core process parameter determining the grinding accuracy of pulp. At present, most pulp refiners use mechanical scales or simple electrical sensors for gap monitoring. The mechanical scale usually directly indicates the gap size through a pointer connected to the moving plate and a fixed scale, and some improved devices may be equipped with ordinary displacement sensors to convert mechanical displacement into analog electrical signals and read on a simple display instrument. These methods achieve rough monitoring of the plate gap in basic functions and constitute the main technical basis in current production sites.

[0003] However, the above prior art has obvious limitations. First, the mechanical scale relies on manual visual reading, which has parallax and subjective judgment errors, and is difficult to meet the requirements of high-precision digital production, and reading is difficult when the light is poor or the scale is blurred. Second, the ordinary electrical monitoring system lacks automatic calibration function. Since the plate will be worn during work, its initial "zero position" will drift, resulting in inaccurate long-term monitoring data, which must be frequently corrected by manual experience, which is inconvenient to maintain. More importantly, the existing technology usually only provides isolated displacement monitoring, which cannot be linked with the device running state (such as motor load, body vibration) for analysis, cannot provide early warning for abnormal wear of the plate or potential failure of the device, and lacks a limit protection mechanism based on intelligent judgment of multiple parameters, so that the safety and intelligence level of the device running is low, which restricts the improvement of production efficiency and device reliability. SUMMARY

[0004] The purpose of the present application is to provide a digital display type pulp refiner plate gap monitoring system to solve the problems raised in the background art.

[0005] To achieve the above purpose, the present application provides the following technical solutions:

[0006] A digital display type pulp refiner plate gap monitoring system, comprising:

[0007] a mechanical transmission and indication unit, an electrical measurement unit, and a control unit;

[0008] The mechanical transmission and indication unit comprises a moving seat, a guide key, a fixed plate, a scale, and a cover plate.

[0009] The guiding key is installed on the moving seat, the fixed plate is fixedly installed on the guiding key through bolts, and the scale is fixedly installed on the fixed plate, so that the scale can move synchronously with the moving seat.

[0010] The cover plate is fixed to the machine body, and the edge thereof is aligned with the scale surface of the scale, so that the mechanical indication value of the grinding piece gap can be intuitively read.

[0011] The electrical measurement unit comprises a linear displacement sensor and a digital display meter.

[0012] The housing of the linear displacement sensor is fixedly installed on the cover plate, and the contact head of the self-resetting touch rod is in contact with the fixed plate.

[0013] The linear displacement sensor is electrically connected to the digital display meter through a cable, so as to convert the displacement amount of the fixed plate into an electrical signal and transmit the electrical signal to the digital display meter for real-time digital display.

[0014] The control unit is integrated in the digital display meter, and is configured to receive the signal of the linear displacement sensor and allow a user to set at least three position limit values, i.e., a zero position, a tool withdrawal limit value, an infeed limit value, and a safety limit value.

[0015] Preferably, the installation position of the scale on the fixed plate is adjustable; when the grinding piece is used for the first time and contacts the zero position, the position of the scale is adjusted so that the scale 0 position is aligned with the observation edge of the cover plate, so as to establish the mechanical zero position of the system.

[0016] Preferably, the linear displacement sensor is electrically zeroed through the digital display meter after the mechanical zero position of the system is established, and the display value is set to 0.

[0017] Preferably, the tool withdrawal limit value is set to a negative value, the infeed limit value is set to a positive value, and the safety limit value is an absolute value greater negative value.

[0018] Preferably, the control unit further comprises a wear self-adaptive calibration module, configured to perform the following steps:

[0019] a. When the grinding piece contacts the zero position, the reading P of the displacement sensor at this moment is recorded c , and the load current data of the driving motor and the vibration data of the machine body are synchronously collected;

[0020] b. Based on the current collected data and the reference data stored in the system, a comprehensive wear factor W is calculated;

[0021] c. The wear factor W is compared with a preset threshold value threshold WCompare, or determine whether the cumulative running time since the last calibration exceeds a preset time threshold threshold W ;

[0022] d. When any of the conditions in step c is met, the system generates a calibration prompt signal or automatically starts a zero calibration program to update the electrical zero reference of the system.

[0023] Preferably, the calculation model of the wear factor W is:

[0024] W = a · (P c -P c0 ) + b · (I avg -I0) + g · (V rms -V0);

[0025] Wherein, P c0 , I0, V0 are the reference parameters established in the last calibration period, I avg is the average motor load current in the current contact process, V rms is the effective value of the vibration signal in the current contact process, a, b, g are weight coefficients preset according to the system characteristics;

[0026] In addition, the calibration decision step also introduces the cumulative effective running time T of the refiner as a decision variable, when T-T last_calibration >Threshold T , the calibration execution step is also triggered.

[0027] Compared with the prior art, the beneficial effects of the present application are:

[0028] (1) Through the cooperative work of mechanical transmission and indication unit, a mechanical and digital double indication channel is constructed, which not only enables the operator to make quick and intuitive mechanical reading through the scale, but also obtains high-precision real-time digital feedback from the digital display table, improving the convenience and accuracy of reading. At the same time, the linear displacement sensor is combined with the adjustable zero scale, and the intelligent calibration algorithm of the control unit can automatically or prompt the user to compensate for the measurement error caused by the wear of the grinding plate, effectively solving the problem of reference drift caused by long-term use of traditional systems, thereby long-term guaranteeing the monitoring accuracy.

[0029] (2) The control unit integrated in the digital display table allows multiple limit values (such as feed, retreat and safety limit) to be preset, and can compare in real time according to the feedback signal of the linear displacement sensor, which can issue an alarm or execute a stop in abnormal working conditions, thereby fundamentally preventing equipment damage and potential production accidents. In addition, by fusing and analyzing displacement readings Pc, motor current and machine vibration data, comprehensive diagnosis and predictive maintenance of the grinding plate state are realized. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The whole structure of the present application is shown in the schematic diagram;

[0031] Figure 2 The application form of the present application is shown in the schematic diagram;

[0032] In the figure: 1, moving seat; 2, guide key; 3, fixed plate; 4, scale; 5, cover plate; 6, linear displacement sensor; 7, digital display. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] Embodiment one:

[0035] Please refer to Figures 1-2 The digital display grinding gap monitoring system of a grinding machine shown in the figure comprises:

[0036] The mechanical transmission and indication unit, the electrical measurement unit and the control unit are included.

[0037] The mechanical transmission and indication unit comprises a moving seat 1, a guide key 2, a fixed plate 3, a scale 4 and a cover plate 5.

[0038] The moving seat 1 is used to carry the grinding plate and move with the change of the gap, the guide key 2 ensures the linear motion of the moving seat 1 along the predetermined direction, the fixed plate 3 connects the scale 4 and transmits the displacement to the scale 4, the scale 4 provides the mechanical scale indication, and the cover plate 5 serves as the reference datum and reflects the change of the grinding gap.

[0039] The guide key 2 is installed on the moving seat 1, the fixed plate 3 is fixedly installed on the guide key 2 through bolts, and the scale 4 is fixedly installed on the fixed plate 3, so that the scale 4 can move synchronously with the moving seat 1.

[0040] The guide key 2 plays a guiding and anti-rotation role, ensures the stability of the moving seat 1 in the linear motion process, so that the scale change of the scale 4 directly corresponds to the actual value of the grinding gap, and the precision of the mechanical indication is improved.

[0041] The cover plate 5 is fixed with the machine body, the edge thereof is aligned with the scale surface of the scale 4, and is used to visually read the mechanical indication value of the grinding gap.

[0042] The cover plate 5 serves as a fixed reference point, and its edge is aligned with the scale surface of the scale 4, so that the operator can directly read the gap value visually. This mechanical indication mode can still provide reliable backup monitoring when the electrical measurement unit fails, ensuring the continuity and safety of the system.

[0043] The electrical measurement unit includes a linear displacement sensor 6 and a digital display meter 7.

[0044] The electrical measurement unit converts mechanical displacement into electrical signals through the linear displacement sensor 6 and displays the gap value in real time through the digital display meter 7.

[0045] The housing of the linear displacement sensor 6 is fixedly installed on the cover plate 5, and the contact of the self-resetting touch lever is in contact with the fixed plate 3.

[0046] The housing of the linear displacement sensor 6 is fixed on the cover plate, ensuring the stability of the reference of the sensor. The self-resetting touch lever can automatically adapt to the displacement of the fixed plate and maintain contact, thereby detecting the displacement change in real time. This design reduces wear and error, improves the service life and measurement accuracy of the sensor;

[0047] The linear displacement sensor 6 is electrically connected to the digital display meter 7 through a cable, for converting the displacement amount of the fixed plate 3 into an electrical signal and transmitting it to the digital display meter 7 for real-time digital display.

[0048] The electrical signal transmission is realized through a cable, ensuring the real-time and reliability of the data. The digital display meter 7 processes and displays the signal, usually including a filter and amplifier circuit to eliminate noise interference and provide stable and clear digital readings. The gap change can be monitored in real time through the display meter 7, facilitating timely adjustment of operating parameters;

[0049] The control unit is integrated in the digital display meter 7, for receiving the signal of the linear displacement sensor 6 and allowing the user to set at least three position limit values: zero position, tool withdrawal limit value, tool feeding limit value, and safety limit value.

[0050] In an embodiment of the present application, the installation position of the scale 4 on the fixed plate 3 is adjustable. When the grinding piece is used for the first time and contacts zero, the position of the scale 4 is adjusted so that the scale 0 is aligned with the observation edge of the cover plate 5, thereby establishing the mechanical zero of the system.

[0051] The adjustable design of the position of the scale 4 allows zero calibration after installation or replacement of the grinding piece. After adjusting the position of the scale 4 by loosening the fixing bolts and then tightening them again, the zero calibration can be completed.

[0052] In one embodiment of the present application, the linear displacement sensor 6 is electrically zeroed by the digital display meter 7 after the mechanical zero is established by the system, and the display value is set to 0.

[0053] In one embodiment of the present application, the retraction limit value is set to a negative value, the feed limit value is set to a positive value, and the safety limit value is a negative value with an absolute value greater than the retraction limit value.

[0054] In one embodiment of the present application, the control unit further comprises a wear self-adaptive calibration module for performing the following steps:

[0055] a. Record the reading P of the displacement sensor at the moment when the grinding piece contacts zero c , and simultaneously collect the load current data of the driving motor and the vibration data of the machine body;

[0056] b. Calculate a comprehensive wear factor W based on the currently collected data and the reference data stored in the system;

[0057] c. Compare the wear factor W with a preset threshold value Threshold W , or determine whether the cumulative running time since the last calibration exceeds a preset time threshold Threshold W ;

[0058] d. When any of the conditions in step c is met, the system generates a calibration prompt signal or automatically starts a zero point calibration program to update the electrical zero reference of the system.

[0059] In one embodiment of the present application, the calculation model of the wear factor W is:

[0060] W = a · (P c -P c0 ) + b · (I avg -I0) + g · (V rms -V0);

[0061] where P c0 , I0, V0 are the reference parameters established in the last calibration period, I avg is the average motor load current during the current contact process, V rms is the effective value of the vibration signal during the current contact process, a, b, g are the weight coefficients preset according to the system characteristics;

[0062] The calibration decision step also includes the cumulative effective running time T of the grinding machine as a decision variable, and when T-T last_calibration > Threshold T , the calibration execution step is also triggered.

[0063] From the above, the operator moves the grinding disc to contact zero, at this time, the moving seat 1 connected with the grinding disc transmission mechanism will drive the fixed plate 3 to reach a reference position through the guide key 2, then, adjust the position of the scale 4 on the fixed plate 3, so that the scale "0" is accurately aligned with the edge of the cover plate 5 fixedly installed on the machine body, thereby establishing the mechanical reference zero position of the system. Then, the electrical zero adjustment is carried out: the linear displacement sensor 6 fixedly installed on the cover plate 5 detects the reference displacement signal through the contact with the fixed plate 3 and transmits it to the digital display meter 7, and the operator sets the current display value to "0" through the control interface of the digital display meter 7, so that the digital display is synchronized with the mechanical indication. On this basis, the operator presets the positive feed limit value, the negative retreat limit value and the negative safety limit value in the control unit integrated in the digital display meter 7, to set the boundary for automatic operation and safety protection;

[0064] After entering the daily operation and real-time monitoring stage, the system starts to work in double channels in parallel. When the grinding machine is running, the moving seat 1 moves with the change of the grinding disc gap, and drives the fixed plate 3 and the scale 4 installed thereon to move synchronously through the guidance of the guide key 2;

[0065] The operator can directly read the scale value on the scale 4 relative to the edge of the cover plate 5 through the observation window of the cover plate 5 to obtain the mechanical indication value of the gap, which is an intuitive and reliable backup monitoring method. At the same time, the electrical measurement unit plays a core role: the contact rod of the linear displacement sensor 6 expands and contracts with the displacement of the fixed plate 3, which converts the linear displacement into an electrical signal in real time; the signal is transmitted to the digital display meter 7 through the cable, and after being processed by the internal circuit, the value of the grinding disc gap is finally displayed in the form of high-precision digital value in real time, which is convenient for the operator to accurately monitor;

[0066] The intelligence of the system is reflected in the self-diagnosis and intelligent calibration stage. The control unit will automatically record the reading of the linear displacement sensor 6 and synchronously collect the average load current of the driving motor and the effective value of the vibration of the machine body every time the grinding disc contacts zero;

[0067] The system uses these real-time data, combines the reference parameters stored in the last calibration period, and calculates a comprehensive wear factor W which comprehensively reflects the wear of the grinding disc and the state of the equipment through the preset wear factor model. The system will continuously compare W with the preset threshold Threshold_W, and at the same time monitor the cumulative effective running time since the last calibration. Once the wear factor W exceeds the threshold, or the running time exceeds the preset Threshold_T, and any one condition is met, the system will send a calibration prompt signal to remind the operator through the digital display meter 7, or directly start the zero calibration program to update the zero reference of the electrical system composed of the linear displacement sensor 6 and the digital display meter 7, thereby ensuring the accuracy of the monitoring data in long-term operation;

[0068] Finally, there is the safety protection and intervention phase. Throughout the entire operation, the control unit integrated in the digital display 7 constantly compares the real-time gap value fed back by the linear displacement sensor 6 with the preset limit value. If the gap value reaches the feed or retraction limit, the system can issue an audible and visual alarm or output a control signal to the actuator through the digital display 7; once the gap value reaches a safety limit value with a larger absolute value, the system will trigger the highest level alarm or execute an emergency stop, effectively preventing equipment damage.

[0069] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A digitally displayed refiner plate gap monitoring system, characterized by, The mechanical transmission and indication unit, the electrical measurement unit and the control unit are included. The mechanical transmission and indication unit includes a moving seat (1), a guide key (2), a fixed plate (3), a scale (4) and a cover plate (5). The moving seat (1) is provided with the guide key (2), the fixed plate (3) is fixedly installed on the guide key (2) by bolts, and the scale (4) is fixedly installed on the fixed plate (3), so that the scale (4) can move synchronously with the moving seat (1). The cover plate (5) is fixed with the machine body, the edge thereof is aligned with the scale surface of the scale (4), and is used for visually reading the mechanical indication value of the grinding piece gap. The electrical measurement unit includes a linear displacement sensor (6) and a digital display meter (7). The housing of the linear displacement sensor (6) is fixedly installed on the cover plate (5), and the contact of the self-resetting touch rod thereof is in contact with the fixed plate (3). The linear displacement sensor (6) is electrically connected with the digital display meter (7) through a cable, is used for converting the displacement amount of the fixed plate (3) into an electrical signal and transmitting the electrical signal to the digital display meter (7) for real-time digital display. The control unit is integrated in the digital display meter (7), is used for receiving the signal of the linear displacement sensor (6), and allows a user to set at least three position limit values, i.e., a zero position, a tool withdrawal limit value, an advance limit value and a safety limit value.

2. A digitally displayed refiner plate gap monitoring system as claimed in claim 1, characterized in that: The installation position of the scale (4) on the fixed plate (3) is adjustable; when the grinding piece is used for the first time and is contacted to zero, the position of the scale (4) is adjusted, so that the scale 0 position is aligned with the observation edge of the cover plate (5), so as to establish the mechanical zero position of the system.

3. A digitally displayed refiner plate gap monitoring system as claimed in claim 1, wherein: After the linear displacement sensor (6) establishes the mechanical zero position of the system, the electrical zero is adjusted through the digital display meter (7), and the display value is set to 0.

4. A digitally displayed refiner plate gap monitoring system as claimed in claim 1, wherein: The tool withdrawal limit value is set to a negative value, the advance limit value is set to a positive value, and the safety limit value is an absolute value greater negative value.

5. A digitally displayed refiner plate gap monitoring system as claimed in claim 1, wherein, The control unit further includes a wear self-adaptive calibration module, which is used for performing the following steps: a. At the moment when the contact pair of the grinding piece is zero, record the reading P of the displacement sensor at this moment c And synchronously collect the load current data of the driving motor and the vibration data of the machine body; b. Based on the current collected data and the reference data stored in the system, a comprehensive wear factor W is calculated; c.comparing the wear factor W with a preset threshold value threshold W or determining whether the cumulative running time since the last calibration exceeds a preset time threshold value threshold W ; d. When any condition in step c is met, the system generates a calibration prompt signal or automatically starts a zero point calibration program to update the electrical zero reference of the system.

6. A digitally displayed refiner plate gap monitoring system as claimed in claim 1, wherein The calculation model of the wear factor W is as follows: W=α·(P c -P c0 )+β·(I avg -I0)+γ·(V rms -V0); Wherein, P c0 I0, V0 are the reference parameters established in the last calibration cycle, I avg is the average motor load current in the current contact process, V rms is the effective value of the vibration signal in the current contact process, and α, β, and γ are the weight coefficients preset according to the system characteristics. Furthermore, the calibration decision step also introduces the cumulative effective running time T of the refiner as a decision variable, when T-T last_calibration >Threshold T step is also triggered.

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