A method of reducing equipment damage in a paper industry pulp line double disk refiner

Abstract

The application discloses a method for reducing equipment damage of a double-disc refiner of a pulp line in a papermaking industry, and relates to the technical field of a double-disc refiner of a papermaking industry. The double-disc refiner comprises the following steps: step one: a knife withdrawal motor is connected to three-phase voltage through a frequency converter; the U, V and W terminals of the frequency converter are connected to the knife withdrawal motor; and the R, S and T terminals of the frequency converter are connected to phase lines; step two: the K1, K2 and K5 coils of intermediate relays are connected to DCS, and are used for controlling the quick forward and reverse rotation of the knife withdrawal motor; and step three: one end of a contact switch of the K1 intermediate relay is connected to the Di0 terminal of the frequency converter. The present application solves the problems in the prior art that when a DCS system of a refiner fails, the refiner cannot receive the feedback signals of field sensors, or the sensors fail to feed back signals to the DCS, the transmission equipment cannot stop and keeps outputting, and the transmission mechanism is twisted and broken, which causes economic losses and hidden dangers in safety production.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of papermaking double-disc refiner, in particular to a method for reducing equipment damage of double-disc refiner in papermaking pulp line. BACKGROUND

[0002] The refiner is the most basic instrument used in the field of pulp and paper industry test and research. The refiner can make wood chips into pulp, improve pulp or make wood chips into synthetic fibers, glass fibers and carbon fibers. The high-voltage motor main circuit of the double-disc refiner adopts a vacuum circuit breaker for control. The DCS system compares the actual power and the set power of the high-voltage cabinet feedback. The DCS control system remotely outputs signals to control the forward and reverse rotation of the advance and retreat knife frequency converter to adjust the size of the refiner plate gap, thereby realizing constant power automatic control.

[0003] For example, the Chinese authorized patent with the publication number CN214459167U (a refiner blade) includes a coarse blade assembly, a half blade assembly and a fine blade assembly. The coarse blade assembly includes a coarse blade fixed knife and a coarse blade rotating knife. The half blade assembly includes a half blade fixed knife and a half blade rotating knife. The fine blade assembly includes a fine blade fixed knife and a fine blade rotating knife. The pulp is processed through the coarse blade assembly, the half blade assembly and the fine blade assembly in sequence. The blade angle gradually increases in the coarse blade assembly and the half blade assembly, or the blade angle gradually increases in the half blade assembly and the fine blade assembly. The blade angle in the coarse blade assembly is 4 degrees. The blade angle in the half blade assembly is 8 degrees. The blade angle in the fine blade assembly is 8 degrees.

[0004] However, the above-mentioned prior art refiner cannot receive the signals feedback by the on-site sensor when the DCS system fails, or the sensor fails to feedback signals to the DCS. The transmission equipment cannot stop and keeps outputting, resulting in a torsional fracture accident of the transmission mechanism, which is prone to economic losses and safety production hazards. Therefore, the existing needs are not met. To solve the above problems, we propose a method for reducing equipment damage of double-disc refiner in papermaking pulp line. SUMMARY

[0005] The present application aims to provide a method for reducing equipment damage of double-disc refiner in papermaking pulp line, to solve the above-mentioned problems in the prior art. When the DCS system fails, the refiner cannot receive the signals feedback by the on-site sensor, or the sensor fails to feedback signals to the DCS. The transmission equipment cannot stop and keeps outputting, resulting in a torsional fracture accident of the transmission mechanism, which is prone to economic losses and safety production hazards.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a method for reducing equipment damage of double-disc refiner in papermaking pulp line, comprising the following steps:

[0007] Step one: first retractor motor through the frequency converter three-phase voltage, frequency converter U, V, W terminal retractor motor, frequency converter R, S, T terminal phase line;

[0008] Step two: intermediate relay K1, K2, K5 coil are connected to DCS, respectively, for control retractor motor fast forward and reverse;

[0009] Step three: intermediate relay K1 contact switch one end of the Di0 terminal of the frequency converter, intermediate relay K2, K5 contact switch one end of the Di1 terminal of the frequency converter;

[0010] Step four: intermediate relay K1 contact switch the other end and the intermediate relay K2 contact switch the other end connected through the limit switch to the +24V terminal of the frequency converter;

[0011] Step five: limit switch installed in the limit position of the retractor pulp machine, used to control the limit position of the retractor.

[0012] Preferably, the DCS in step two includes a control cabinet, the inside of the control cabinet is provided with a DCS system, the inside of the DCS system is provided with a retractor module, a relay module, a frequency converter module and a limit switch module, the inside of the relay module is provided with intermediate relay K1, K2, K5 and relay K3, K4.

[0013] Preferably, the retractor module, the relay module, the frequency converter module and the limit switch module are electrically connected with the DCS system, and the DCS system is electrically connected with a communication module.

[0014] Preferably, the bottom of the control cabinet is provided with a base, the front end face of the control cabinet is provided with a cabinet door, and one side of the front end face of the cabinet door is provided with a door handle.

[0015] Preferably, the front end face of the cabinet door is provided with a monitoring device, the lower portion of the monitoring device is provided with an observation port, the top of the control cabinet is provided with a heat dissipation device, the upper surface of the heat dissipation device is provided with a heat dissipation port, and the heat dissipation port is provided with a plurality of heat dissipation ports.

[0016] Preferably, the inside of the control cabinet is provided with a partition plate, the inside of the partition plate is provided with a plurality of air holes, the rear end face of the inside of the control cabinet is provided with a mounting bracket, and the front end face of the mounting bracket is provided with a plug-in slot.

[0017] Preferably, the tool withdrawal limiting assembly in the fifth step is provided with a first fixed plate, and the front end surface of the first fixed plate is provided with fixed screws around, the inside of the first fixed plate is provided with a communication port, the inside of the communication port is provided with a scale rod, the front end surface of the scale rod is provided with a connecting plate, one side of the first fixed plate is provided with a supporting plate, the upper surface of the supporting plate is provided with a controller, and one side of the controller is provided with a support.

[0018] Preferably, the upper surface of the support is provided with a second rotating seat, one side of the second rotating seat is provided with a connecting rod, the other end of the connecting rod is fixedly connected with the connecting rod, and the inside of the connecting rod is provided with a first rotating seat.

[0019] Preferably, the inside of the fixed frame is provided with a connecting groove, the inside of the connecting groove is provided with a fixed hole, the upper and lower ends of the front end surface of the fixed frame are provided with mounting holes, the front end of the fixed frame is provided with a second fixed plate, and the front end surface of the second fixed plate is provided with a control switch.

[0020] Compared with the prior art, the present application has the following advantages:

[0021] 1、The tool withdrawal module, the relay module, the frequency converter module and the travel switch module are arranged in the DCS system, the state of the controller, the communication module and the input and output card in the DCS system is collected, the safety control loop is increased, when any one of the three or four levels of hardware in the system fails, the frequency converter is controlled through the hard-wired interlocking, the tool withdrawal motor is controlled to withdraw in an emergency, and a mechanical travel switch is arranged at the limit position of the tool withdrawal, when the DCS system, the proximity sensor and the position photoelectric switch for controlling the tool withdrawal fail and the limit suppression of the tool withdrawal fails, the travel switch can directly disconnect the power supply of the tool withdrawal motor, the probability of damage of the equipment is effectively reduced, the safety hazard is avoided, the investment cost is small, the failure rate of the inductive proximity switch electronic element is effectively avoided, the safety risk is reduced, the software and hardware bottom layer data of the control system are collected, the major economic loss caused by the equipment damage accident of the control system failure is effectively reduced, and the problems in the prior art that the DCS system of the refiner fails, the signal feedback from the field sensor cannot be received, or the sensor fails and cannot feedback the signal to the DCS, the transmission equipment cannot stop and keeps outputting, the transmission mechanism is twisted off, economic loss and safety production hazards are prone to occur.

[0022] 2. By setting the tool withdrawal limiting assembly, the scale rod and the controller are arranged on the tool withdrawal limiting assembly, the connecting plate of the scale rod is connected with the first rotating seat and the second rotating seat through the connecting rod, and the connecting rod is rotationally connected with the first rotating seat and the second rotating seat, and the first fixed plate and the supporting plate are installed on the device, when the tool withdrawal module drives it to operate, the maximum limit position corresponding to the scale rod is used to ensure that the equipment will not be over-limited.

[0023] 3. By arranging a wire from the tool withdrawal limiting assembly on the spot to the inside of the control cabinet as a signal feedback line, the start-stop operation control of the tool feeding and withdrawing motor is realized through the on-off of the signal, and the K5 relay is added in the control cabinet for the DCS control system hardware, software and network communication, when the abnormality occurs, the normally closed point is connected to the fast tool withdrawal node. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the control cabinet of the application;

[0025] Figure 2 It is an enlarged schematic diagram of the partial structure inside the control cabinet of the application;

[0026] Figure 3 It is a schematic diagram of the structure of the tool withdrawal limiting assembly of the application;

[0027] Figure 4 It is an enlarged schematic diagram of the partial installation structure of the control switch of the application;

[0028] Figure 5 It is a schematic diagram of the system principle of the application;

[0029] Figure 6 It is a circuit schematic diagram of the application;

[0030] In the figure: 1, control cabinet; 2, base; 3, cabinet door; 4, door handle; 5, monitoring device; 6, observation port; 7, heat dissipation device; 8, heat dissipation port; 9, spacing plate; 10, air hole; 11, mounting bracket; 12, plug-in slot; 13, first fixed plate; 14, fixed screw; 15, communication port; 16, scale rod; 17, connecting plate; 18, connecting rod; 19, first rotating seat; 20, supporting plate; 21, controller; 22, support; 23, second rotating seat; 24, fixed bracket; 25, connecting slot; 26, fixed hole; 27, mounting hole; 28, second fixed plate; 29, control switch; 30, DCS system; 31, tool withdrawal module; 32, relay module; 33, frequency converter module; 34, travel switch module; 35, tool withdrawal limiting assembly. DETAILED DESCRIPTION

[0031] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application.

[0032] Please refer to Figures 1-6 The present application provides an embodiment: a method for reducing equipment damage of a double-disc refiner in a pulp line in a papermaking industry, comprising the following steps:

[0033] Step one: first, the knife withdrawal motor is connected to three-phase voltage through a frequency converter, the U, V and W terminals of the frequency converter are connected to the knife withdrawal motor, and the R, S and T terminals of the frequency converter are connected to phase lines;

[0034] Step two: the coils of the intermediate relays K1, K2 and K5 are connected to DCS, and are respectively used for controlling the quick forward and reverse rotation of the knife withdrawal motor;

[0035] Step three: one end of the contact switch of the intermediate relay K1 is connected to the Di0 terminal of the frequency converter, and one end of the contact switch of the intermediate relays K2 and K5 is connected to the Di1 terminal of the frequency converter;

[0036] Step four: the other end of the contact switch of the intermediate relay K1 and the other end of the contact switch of the intermediate relay K2 are connected, and then are connected to the +24V terminal of the frequency converter through a travel switch;

[0037] Step five: the travel switch is installed at the limit position of the back-off of the pulp machine, used to control the limit position of the back-off; by setting the back-off module 31, the relay module 32, the frequency converter module 33, the travel switch module 34 in the DCS system 30, by signal acquisition of the state of the controller 21, the communication module, the input and output card in the DCS system 30, a safety control loop is added, when any one of the three or four levels of hardware in the system fails, the frequency converter is controlled by hard-wired interlocking, the control of the back-off motor is realized, and the mechanical travel switch is installed at the limit position of the back-off, when the DCS system 30, the proximity sensor and the position photoelectric switch controlling the back-off fail to cause the limit of the back-off to be suppressed, the travel switch can directly disconnect the power supply of the back-off motor, effectively reducing the probability of damage to the equipment and avoiding safety hazards, the investment cost is small, the electronic element failure rate of the inductive proximity switch is effectively avoided, the safety risk is reduced, the bottom layer data of the software and hardware of the control system are collected, the major economic losses caused by the damage of the equipment due to the failure of the control system are effectively reduced, the problem that the DCS system 30 fails to receive the feedback signal of the on-site sensor or the sensor fails to feedback the signal to the DCS in the prior art, the transmission equipment cannot stop and keeps outputting, causing the transmission mechanism to break and leading to economic losses and safety production hazards is solved, by setting the back-off limiting component 35, the scale rod 16 and the controller 21 are set on the back-off limiting component 35, the connecting plate 17 of the scale rod 16 is connected with the first rotating seat 19 and the second rotating seat 23 through the connecting rod 18, and the connecting rod 18 is rotationally connected with the first rotating seat 19 and the second rotating seat 23, which is installed on the device through the first fixed plate 13 and the support plate 20, when the back-off module 31 drives it to operate, the maximum limit position corresponding to the scale rod 16 is used to ensure that the equipment will not be over-limited, the back-off limiting component 35 is connected with the control cabinet 1 inside through a wire from the field as a signal feedback line, the start-stop operation control of the back-off motor is realized through the on-off of the signal, and the K5 relay is added in the control cabinet 1 for the DCS control system hardware, software and network communication, and the normally closed point is connected to the fast back-off node when the DCS control system hardware, software and network communication are abnormal.

[0038] Please refer to Figures 1-6 , the DCS in the above step two includes the control cabinet 1, the inside of the control cabinet 1 is provided with the DCS system 30, the inside of the DCS system 30 is provided with the back-off module 31, the relay module 32, the frequency converter module 33 and the travel switch module 34, the inside of the relay module 32 is provided with the intermediate relays K1, K2, K5 and the relays K3, K4.

[0039] Please refer to Figures 1-6The tool withdrawal module 31, the relay module 32, the frequency converter module 33 and the travel switch module 34 are electrically connected with the DCS system 30, and the DCS system 30 is electrically connected with the communication module. By setting the tool withdrawal module 31, the relay module 32, the frequency converter module 33 and the travel switch module 34 in the DCS system 30, collecting the states of the controller 21, the communication module and the input / output card in the DCS system 30, adding a safety control loop, when any one of the three or four levels of hardware in the system fails, the frequency converter is controlled through the hard-wired interlocking, the control of the tool withdrawal motor is realized, the tool is withdrawn in an emergency, and a mechanical travel switch is installed at the limit position of the tool withdrawal, when the DCS system 30, the proximity sensor and the position photoelectric switch for controlling the tool withdrawal fail to work, resulting in the failure of the limit suppression of the tool withdrawal, the travel switch can directly disconnect the power supply of the tool withdrawal motor, effectively reducing the probability of damage of the equipment and avoiding the safety hazard. The investment cost is small, the failure rate of the inductive proximity switch electronic element is effectively avoided, the safety risk is reduced, the bottom layer data of the hardware and software of the control system are collected, the major economic losses caused by the equipment damage accidents caused by the failure of the control system are effectively reduced, and the problems in the prior art that the DCS system 30 of the refiner fails to receive the feedback signals of the field sensors or the sensors fail to feed back the signals to the DCS, the transmission equipment cannot stop and keeps outputting, resulting in the torsion fracture of the transmission mechanism and the economic losses and safety production hazards are solved.

[0040] Please refer to Figures 1-6 The bottom of the control cabinet 1 is provided with a base 2, and the front end face of the control cabinet 1 is provided with a cabinet door 3. One side of the front end face of the cabinet door 3 is provided with a door handle 4.

[0041] Please refer to Figures 1-6 The front end face of the cabinet door 3 is provided with a monitoring device 5, and the lower portion of the monitoring device 5 is provided with an observation port 6. The top of the control cabinet 1 is provided with a heat dissipation device 7, and the upper surface of the heat dissipation device 7 is provided with a heat dissipation port 8. The heat dissipation port 8 is provided with a plurality of heat dissipation ports.

[0042] Please refer to Figures 1-6 The inside of the control cabinet 1 is provided with a partition plate 9, and the inside of the partition plate 9 is provided with a plurality of air holes 10. The rear end face of the inside of the control cabinet 1 is provided with a mounting frame 11, and the front end face of the mounting frame 11 is provided with a plug-in slot 12, which facilitates the disassembly and assembly of the internal module and ensures the flexibility and practicality of the module in use.

[0043] Please refer to Figures 1-6In step five above, the retraction of the pulping machine includes a retraction limiting component 35 and a fixing frame 24. The retraction limiting component 35 is provided with a first fixing plate 13. Fixing screws 14 are provided around the front end face of the first fixing plate 13. A connecting port 15 is provided inside the first fixing plate 13. A scale rod 16 is provided inside the connecting port 15. A connecting plate 17 is provided on the front end face of the scale rod 16. The retraction motor is connected to three-phase voltage through a frequency converter. The U, V, and W terminals of the frequency converter are connected to the retraction motor, and the R, S, and T terminals of the frequency converter are connected to the phase lines. The coils of intermediate relays K1, K2, and K5 are all connected to a DCS and are used to control the rapid forward and reverse rotation of the retraction motor. One end of the contact switch of intermediate relay K1 is connected to the Di0 terminal of the frequency converter, and one end of the contact switches of intermediate relays K2 and K5 is connected to the Di1 terminal of the frequency converter. The other end of the contact switch of intermediate relay K1 and the other end of the contact switch of intermediate relay K2 are connected to the +24V terminal of the frequency converter through a limit switch. The limit switch is installed at the extreme position of the retraction of the pulping machine to control the extreme position of the retraction, add safety protection logic and control, and ensure that the equipment protection function can be realized in abnormal conditions by collecting the status signals of controller 21, communication module and input / output card in DCS system 30.

[0044] Please see Figures 1-6 A support plate 20 is provided on one side of the first fixed plate 13, a controller 21 is provided on the upper surface of the support plate 20, and a bracket 22 is provided on one side of the controller 21.

[0045] Please see Figures 1-6 The upper surface of the bracket 22 is provided with a second rotating seat 23. A connecting rod 18 is provided on one side of the second rotating seat 23. The other end of the connecting rod 18 is fixedly connected to the connecting rod 18. A first rotating seat 19 is provided inside the connecting rod 18, so that the connection of the scale rod 16 is prevented from getting stuck when it extends or retracts.

[0046] Please see Figures 1-6The fixing frame 24 has a connecting groove 25 inside, and a fixing hole 26 inside the connecting groove 25. Mounting holes 27 are provided at both the upper and lower ends of the front face of the fixing frame 24. A second fixing plate 28 is provided at the front end of the fixing frame 24, and a control switch 29 is provided on the front face of the second fixing plate 28. A tool retraction limiting component 35 is provided, on which a scale rod 16 and a controller 21 are provided. The connecting plate 17 of the scale rod 16 is connected to the first rotating seat 19 and the second rotating seat 23 via a connecting rod 18. The connecting rod 18 is also connected to the first rotating seat 19 and the second rotating seat 23. Rotary seat 23 is rotatably connected and is mounted on the device via first fixed plate 13 and support plate 20. When the retraction module 31 drives it to operate, the scale rod 16 is used to correspond to the maximum limit position to ensure that the equipment does not exceed the limit. By running a wire from the field to the control cabinet 1 through the retraction limiting component 35 as a signal feedback line, the start and stop operation of the feed and retraction motors are controlled by the on and off of the signal. In addition, a K5 relay is added in the control cabinet 1 so that when the hardware, software and network communication of the DCS control system are abnormal, the normally closed contact is connected to the fast retraction node.

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A method for reducing equipment damage in a double-disc refining mill of a pulp line in the papermaking industry, characterized in that: The process includes the following steps: Step 1: First, the retraction motor is connected to a three-phase voltage via a frequency converter. The U, V, and W terminals of the frequency converter are connected to the retraction motor, and the R, S, and T terminals of the frequency converter are connected to the phase lines. Step 2: The coils of intermediate relays K1, K2, and K5 are all connected to the DCS, respectively used to control the rapid forward and reverse rotation of the retraction motor. Step 3: One end of the contact switch of intermediate relay K1 is connected to the Di0 terminal of the frequency converter, and one end of the contact switches of intermediate relays K2 and K5 is connected to the Di1 terminal of the frequency converter. Step 4: The other end of the contact switch of intermediate relay K1 and the other end of the contact switch of intermediate relay K2 are connected to the +24V terminal of the frequency converter through a limit switch. Step 5: The limit switch is installed at the extreme position of the retraction of the pulper to control the extreme position of the retraction. In step two above, the DCS includes a control cabinet (1), and the control cabinet (1) is equipped with a DCS system (30). The DCS system (30) is equipped with a retraction module (31), a relay module (32), a frequency converter module (33), and a limit switch module (34). The relay module (32) is equipped with intermediate relays K1, K2, K5 and relays K3, K4. By acquiring the status signals of the controller (21), communication module, and input / output card in the DCS system (30), a safety control loop is added. When any hardware in the third or fourth level of the system fails, the frequency converter is controlled by hard-wire interlock to realize emergency retraction of the tool advance and retraction motor. A mechanical limit switch is installed at the limit position of the retraction. When the DCS system (30) controlling the retraction, the proximity sensor, and the position photoelectric switch fail, resulting in the failure of the retraction limit suppression, the limit switch can directly disconnect the power supply of the retraction motor.

2. The method for reducing equipment damage in a double-disc refining mill in a papermaking industry according to claim 1, characterized in that: The retraction module (31), relay module (32), frequency converter module (33) and limit switch module (34) are electrically connected to the DCS system (30), and the DCS system (30) is electrically connected to the communication module.

3. The method for reducing equipment damage in a double-disc refining mill in a papermaking industry according to claim 2, characterized in that: The bottom of the control cabinet (1) is provided with a base (2), and the front end of the control cabinet (1) is provided with a cabinet door (3). A door handle (4) is provided on one side of the front end of the cabinet door (3).

4. The method for reducing equipment damage in a double-disc refining mill in a papermaking industry according to claim 3, characterized in that: The front end of the cabinet door (3) is provided with a monitoring device (5), and an observation port (6) is provided below the monitoring device (5). The top of the control cabinet (1) is provided with a heat dissipation device (7), and the upper surface of the heat dissipation device (7) is provided with a heat dissipation vent (8). There are several heat dissipation vents (8).

5. A method for reducing equipment damage in a double-disc refining mill in a papermaking industry according to claim 4, characterized in that: The control cabinet (1) is provided with a partition plate (9) inside, and the partition plate (9) is provided with a number of ventilation holes (10). The rear end face of the control cabinet (1) is provided with a mounting bracket (11), and the front end face of the mounting bracket (11) is provided with a plug-in slot (12).

6. The method for reducing equipment damage in a double-disc refining mill in a papermaking industry according to claim 5, characterized in that: In step five above, the retraction of the pulping machine includes a retraction limiting component (35) and a fixing frame (24). The retraction limiting component (35) is provided with a first fixing plate (13). Fixing screws (14) are provided around the front end face of the first fixing plate (13). A connecting port (15) is provided inside the first fixing plate (13). A scale rod (16) is provided inside the connecting port (15). A connecting plate (17) is provided on the front end face of the scale rod (16).

7. A method for reducing equipment damage in a double-disc refining mill in a papermaking industry according to claim 6, characterized in that: A support plate (20) is provided on one side of the first fixing plate (13), a controller (21) is provided on the upper surface of the support plate (20), and a bracket (22) is provided on one side of the controller (21).

8. A method for reducing equipment damage in a double-disc refining mill in a papermaking industry according to claim 7, characterized in that: The upper surface of the bracket (22) is provided with a second rotating seat (23), and a connecting rod (18) is provided on one side of the second rotating seat (23). The other end of the connecting rod (18) is fixedly connected to the connecting rod (18), and a first rotating seat (19) is provided inside the connecting rod (18).

9. A method for reducing equipment damage in a double-disc refining mill in a papermaking industry according to claim 8, characterized in that: The fixing frame (24) has a connecting groove (25) inside, and a fixing hole (26) inside the connecting groove (25). The upper and lower ends of the front end face of the fixing frame (24) are provided with mounting holes (27). The front end of the fixing frame (24) is provided with a second fixing plate (28), and the front end face of the second fixing plate (28) is provided with a control switch (29).

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