A coal mill overheating monitoring and protection device

Abstract

The application relates to a coal mill overheating monitoring and protecting device, in particular to a coal mill overheating monitoring and protecting device. The application provides a circuit hardware basis of the coal mill overheating monitoring and protecting device. The application comprises a power supply circuit, a touch screen control circuit, an audible and visual alarm circuit, a data control processing circuit, an Ethernet circuit, a temperature acquisition circuit, a crushing head control circuit, a nitrogen fire extinguishing valve control circuit, a cooling liquid pump control circuit, a three-dimensional posture sensor communication circuit, a grinding disc rotation control circuit and a wheel hub motor control circuit, characterized in that the power output ports of the power supply circuit are connected with the power supply ports of the touch screen control circuit, the power supply ports of the audible and visual alarm circuit, the power supply ports of the data control processing circuit, the power supply ports of the Ethernet circuit, the power supply ports of the temperature acquisition circuit, the power supply ports of the crushing head control circuit and the power supply ports of the nitrogen fire extinguishing valve control circuit respectively.

Description

Technical Field

[0001] This invention belongs to the field of coal mill circuit control technology, and particularly relates to a coal mill overheat monitoring and protection device. Background Technology

[0002] A coal mill is a machine that crushes and grinds coal into pulverized coal; it is an important auxiliary equipment for pulverized coal boilers. Existing coal mills typically employ a drum or roller-disc structure, lacking temperature detection and fire extinguishing devices, as well as the ability to detect the volume of raw coal lumps and handle larger lumps specially. Larger lumps can also jam the pressure rollers. Therefore, there is room for improvement in the existing coal mill structure regarding automation, intelligent monitoring, cooling systems, safety protection, and increasing grinding efficiency (crushing and grinding). Thus, designing an overheat monitoring and protection device for a coal mill is essential. Summary of the Invention

[0003] This invention addresses the aforementioned problems by providing the circuit hardware foundation for a coal mill overheat monitoring and protection device.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: the present invention includes a power supply circuit, a touch screen control circuit, an audible and visual alarm circuit, a data control and processing circuit, an Ethernet circuit, a temperature acquisition circuit, a crushing head control circuit, a nitrogen fire extinguishing valve control circuit, a coolant pump control circuit, a three-dimensional attitude sensor communication circuit, a grinding disc rotation control circuit, and a hub motor control circuit. The power supply circuit's power output port is connected to the power ports of the touch screen control circuit, the audible and visual alarm circuit, the data control and processing circuit, the Ethernet circuit, the temperature acquisition circuit, the crushing head control circuit, and the nitrogen fire extinguishing valve control circuit, respectively. The power ports of the coolant pump control circuit, the three-dimensional attitude sensor communication circuit, the grinding disc rotation control circuit, and the hub motor control circuit are connected. The signal transmission ports of the data control processing circuit are connected to the signal transmission ports of the touch screen control circuit, the audible and visual alarm circuit, the Ethernet circuit, the temperature acquisition circuit, the crushing head control circuit, the nitrogen extinguishing valve control circuit, the coolant pump control circuit, the three-dimensional attitude sensor communication circuit, the grinding disc rotation control circuit, and the hub motor control circuit, respectively.

[0005] The data control processing circuit controls the drive motor for driving the grinding disc assembly to rotate through the grinding disc rotation control circuit, the data control processing circuit controls the hub motor of the hub motor grinding roller module through the hub motor control circuit, and the data control processing circuit controls the crushing and extrusion drive motor of the coal block crushing and extrusion device through the crushing head control circuit.

[0006] The power supply circuit includes EWN10-24S12H module U4, LM2576-5.0 module U2, TPS62040DGQ module U6, TPS62040DGQ module U7, AMS1117-2.5 module U8, and AMS1117-1.8 module U9. Pin 1 of U4 is connected to 24IN+, pin 6 of U4 is connected to pin 1 of U2 through inductor L1, and pin 4 of U2 is connected to 5V.

[0007] Pins 1, 2, and 3 of U6 are connected to 5V. Pins 7 and 8 of U6 are connected to VCC-1.2V and one end of resistor R8 respectively through inductor L4. The other end of R8 is connected to pin 5 of U6 and one end of resistor R12 respectively. The other end of resistor R12 is connected to GND.

[0008] Pins 2 and 3 of U7 are connected to 5V. Pins 7 and 8 of U7 are connected to VCC-3.3V and one end of resistor R10 through inductor L5. The other end of R10 is connected to pin 5 of U7 and one end of resistor R13. The other end of resistor R13 is connected to GND.

[0009] Pin 3 of U8 is connected to 5V, and pins 2 and 4 of U8 are connected to VCC-2.5V.

[0010] Pin 3 of U9 is connected to AVCC-3.3, and pins 2 and 4 of U9 are connected to VCC-1.8.

[0011] The touchscreen control circuit uses ATK-MD0700R module J4. Pins 3-10, 12-19, 21-28, and 30-40 of J4 are respectively connected to LCD-R0-LCD-R7, LCD-G0-LCD-G7, LCD-B0-LCD-B7, LCD-CLK, LCD-HSYNC, LCD-VSYNC, LCD-DE, LCD-BL, TP-CS, TP-MOSI, TP-MISO, TP-SCK, TP-PEN, and RESET.

[0012] The sound and light alarm circuit includes an EL357 chip OP14, an SS8050 transistor Q6, an HL2-PS-K relay K10, and an LTE-1101J alarm J14. The anode of the input terminal of OP14 is connected to BJKZ through a resistor R67, the cathode of the input terminal of OP14 is connected to GND, the collector of the output terminal of OP14 is connected to +12V2 through a resistor R66, the emitter of the output terminal of OP14 is connected to the base of Q6, the emitter of Q6 is connected to GND, and the collector of Q6 is connected to XL1.

[0013] Pin 7 of K10 is connected to XL1, pin 8 of K10 is connected to +12V2, pins 3 to 6 of K10 are connected to BJPUT+, BJPUT-, +12V2, and GND respectively, and pins 1 and 2 of J14 are connected to BJPUT+ and BJPUT- respectively.

[0014] Alarm J14 can be installed in a location easily observable by relevant personnel. Alarm J14 will alert in case of potential fire.

[0015] The data control and processing circuit uses the EP4CE10F17C8 chip U49. The J2, J1, J6, K6, L6, K2, K1, L2, L1, L3, N2, N1, K5, L4, R1, P2, and P1 ports of U49 are respectively connected to LCD-R0~LCD-R7, LCD-G0~LCD-G7, and LCD-B0.

[0016] Pins 1, 2, 5, and 6 of the EPCS4SI8N chip U51 are connected to FPGA-nCSO, FPGA-DATA0, FPGA-ASDO, and FPGA-DCLK respectively.

[0017] U49's D4, E5, F5, B1, C2, C1, F3, D2, D1, G5, F2, F1, G2, G1, and H2 ports are respectively connected to WD-DIN, WD-CLK, WD-CS, WD-DOUT, CLK-PS, FPGA-ASDO, DIN-PS, FPGA-nCSO, PSNetLabel34, PSDJ2-ZCTR, PSDJ2-FCTR, PSPLUSB, PSPLUSA, PSWZFK1, and FPGA-DATA0.

[0018] The N3, P3, R3, T3, T2, R4, T4, N5, N6, M6, P6, K8, R5, T5, R6, T6, L7, R7, T7, L8, and M8 ports of U49 are respectively connected to RESET, TP-PEN, TP-SCK, TP-MISO, TP-MOSI, TP-CS, LCD-BL, LCD-DE, LCD-VSYNC, LCD-HSYNC, LCD-CLK, LCD-B7~LCD-B1, BJKZ, QMA-SDA, and QMA-SCL ports.

[0019] U49's N13 and M12 ports are connected to DOUT-PS and CS-PS respectively;

[0020] The R9, T9, K9, L9, M9, N9, R10, T10, R11, T11, R12, T12, K10, L10, and P9 ports of U49 are respectively connected to MH1, MH2, SBKZ, RTS1, TXD1, RXD1, RTS2, TXD2, RXD2, MPNetLabel34, MPDJ2-ZCTR, MPDJ2-FCTR, MPPLUSA, MPPLUSB, and MPWZFK1.

[0021] U49's C14, D14, D11, D12, A13, B13, A14, B14, E11, E10, and A12 ports are respectively connected to ETH-TXEN-G, ETH-TXD0-G, ETH-TXD1-G, ETH-RST-G, REFCLK-G, ETH-MDC-G, ETH-MIDO-G, ETH-CRS-DV-G, ETH-RXER-G, ETH-RXD0-G, and ETH-RXD1-G;

[0022] Ports A8, B8, C8, D8, E8, F8, A7, B7, F6, F7, C6, A6, B6, E7, E6, A2, B5, A4, and B4 of U49 are respectively connected to LGNetLabel34, LGDJ2-ZCTR, LGDJ2-FCTR, LGPLUSA, LGPLUSB, LGWZFK1, CLK-LG, CS-LG, DIN-LG, DOUT-LG, LG1NetLabel34, LG1DJ2-ZCTR, LG1DJ2-FCTR, LG1PLUSA, LG1PLUSB, CLK-LG1, CS-LG1, DIN-LG1, and DOUT-LG1.

[0023] U51 is used to store FPGA source code.

[0024] The Ethernet circuit includes an HR871155A chip T1 and a LAN8742 chip U14. Pins 3 of T1 are connected to TX-PG and one end of resistor R75, respectively. The other end of R75 is connected to VCC-3.3V,

[0025] One end of resistor R79, one end of resistor R80, one end of resistor R78, and one end of capacitor C170 are connected together. The other end of C170 is grounded. The other end of R78 is connected to pin 4 and TX-NG of T1 respectively. Pins 6 and 7 of T1 are connected to one end of capacitor C175 and one end of resistor R77 respectively. The other end of R77 is connected to VCC-3.3V, and the other end of C175 is grounded.

[0026] The other end of R79 is connected to pin 5 of RX-PG and T1 respectively, and the other end of R80 is connected to pin 8 of RX-NG and T1 respectively;

[0027] Pin 11 of T1 is connected to LEDA-G via resistor R82; pin 14 of T1 is connected to LEDB-G via resistor R83.

[0028] Connect pins 12, 13, and 1 of T1 to GND, and pins 15, 16, and 10 of T1 to ground (ground is the casing ground, filtering out external interference).

[0029] Pins 20 to 23 of U14 are connected to TX-NG, TXP-G, RX-NG, and RX-PG respectively.

[0030] Pins 2 and 3 of U14 are connected to LEDB-G and LEDA-G respectively;

[0031] Pins 7, 8, 10, 11, and 12 of U14 are connected to ETH-RXD1-G, ETH-RXD0-G, ETH-RXER-G, ETH-CRS-DV-G, and ETH-MIDO-G respectively. Pins 13 to 18 of U14 are connected to ETH-MDC-G, REFCLK-G, ETH-RST-G, ETH-TXEN-G, ETH-TXD0-G, and ETH-TXD1-G respectively.

[0032] U49 communicates with Ethernet and transmits information via LAN8720A chip U14 and HR871155A connector T1.

[0033] The temperature acquisition circuit includes a B0505S-1WR2 module PM4, a TPS76333 module U24, an ADUM1401ARWZ chip U1, a ZJR1002 module U23, and an AD7794BRUZ chip U21. Pin 2 of PM4 is connected to 5V, pin 4 of PM4 is connected to pins 1 and 3 of U24, and pin 5 of U24 is connected to WDVCC.

[0034] JTW-LD-WT302C Temperature Sensing Cable J6 ( Figure 7 J6 and Figure 22 The two ends of the component labeled 16 are connected to DL1+ and DL1- respectively.

[0035] Pins 3-6 and 11-14 of U1 are connected to WD-DIN, WD-CLK, WD-CS, WD-DOUT, WD-DOUT1, WD-CS1, WD-CLK1, and WD-DIN1 respectively.

[0036] Pin 4 of U23 is connected to WDVCC via ferrite bead L10, and pin 6 of U23 is connected to WD2.5.

[0037] DL1+ is connected to CH44+ through inductor L11, and DL1- is connected to CH44- through inductor L12;

[0038] Pins 1, 3, 17, 18, 23, and 24 of U21 are connected to WD-CLK1, WD-CS1, CH44+, CH44-, WD-DOUT1, and WD-DIN1 respectively.

[0039] Temperature detection uses JTW-LD-WT302C temperature sensing cable, which can cover and measure a large area of ​​the liner plate up to 25 mm, detect the highest temperature at the covered location, and report the highest temperature.

[0040] Temperature-sensing cables are similar to thermistors and can detect temperature over a large area. For example... Figure 27 As shown, the temperature sensing cable 16 is coiled on the liner plate 25 and placed in the groove.

[0041] PM4 and U24 work together to power the isolation chip U1. The primary and secondary sides of the isolation chip U1 require isolated power supplies.

[0042] The resistance change of the temperature-sensing cable is connected to the circuit via J6. WD2.5 is the power supply. This power supply is divided by a resistor, filtered by inductor L11 to remove high-frequency components, then divided again by DL1+ and DL1-, and finally connected to WDGND via L12 and R49. The differential signal is obtained at CH44+ and CH44-. That is, when the external temperature changes, the resistance of the temperature-sensing cable 16 changes. The temperature-sensing cable 16, the power supply resistor, and ground are connected in series for voltage division to obtain an equivalent differential voltage. This differential power supply is connected to the U21 differential analog-to-digital converter chip. After conversion, the converted digital signal is transmitted to U1 for processing and then sent to U49. U1 is used for signal isolation. The primary and secondary sides (left and right sides in the circuit) can be regarded as normal circuit connections, but they are actually internally isolated, providing a voltage isolation effect of hundreds of volts.

[0043] The crushing head control circuit includes a URA2415YMD-6WR2 module U50, with pins 1 to 5 of U50 connected to INPUT-, 24IN+, +15V, GND, and -15V respectively.

[0044] Pins 1 and 2 of the LM358D module U22 are connected to VDIN-PS. Pin 3 of U22 is connected to one end of resistor R112 and one end of resistor R15 through resistor R111. The other end of R15 is connected to PSOUT, and the other end of R112 is connected to GND.

[0045] Pins 1-3, 9, and 10 of the AD7788ARMZ-REEL chip U26 are connected to CLK-PS, CS-PS, VDIN-PS, DOUT-PS, and DIN-PS respectively.

[0046] Pin 3 of the HKC-F Hall current sensor J18 is connected to PSOUT;

[0047] The anode of the input terminal of P521 chip U34 is connected to PSK102-NC. The emitter of the output terminal of U34 is connected to pin 1 of HFD4 / 5 relay K9 and one end of resistor R35. The other end of R35 is connected to PSNetLabel34. Pin 2 of K9 is connected to PSDJ2-ZCTR through resistor R36. Pin 3 of K9 is connected to the anode of the input terminal of P521 chip U35. The cathode of the input terminal of U35 is connected to pin 4 of K9. The collector of the output terminal of U35 is connected to +12VPS. The emitter of the output terminal of U35 is connected to the base of S8050 transistor Q3 through resistor R34. The emitter of Q3 is connected to GNDPS. The collector of Q3 is connected to PSXLA.

[0048] The controlled switch terminals of relay K8 in HF49FD / 012-1H11 are connected to N-LINE-IN and PSK7NO respectively, and the control terminals of K8 are connected to 12V and PSXLA respectively.

[0049] The L1, L3, and L5 ports of the CJ20-630A module K101 are connected to A-LINE-IN, B-LINE-IN, and C-LINE-IN respectively. The coil ports of K101 are connected to PSK102-NO and PSK7NO respectively. The first NO port of K101 is connected to PSK101-NC, the second NO port of K101 is connected to 5V, the first NC port of K101 is connected to PSK101-NO, and the second NC port of K101 is connected to B-LINE-IN. The L2, L4, and L6 ports of K101 are connected to pins 3, 2, and 1 of J10 respectively.

[0050] Pin 1 of the EWN10-24S12H module U38 is connected to INPUT+ via fuse F2 and diode D17 in sequence; pin 2 of U38 is connected to INPUT-; and pin 6 of U38 is connected to +12VPS.

[0051] Pin 4 of the H11L1 chip U41 is connected to PSPLUSA, and pin 2 of U41 is connected to PSPINPUTA through resistor R51.

[0052] Pin 4 of the H11L1 chip U40 is connected to PSPLUSB, and pin 2 of U40 is connected to PSINPUTB through resistor R47.

[0053] Pins 2 and 3 of the rotary encoder J13 are connected to PSINPUTA and PSINPUTB respectively;

[0054] The anode of the OP1 input terminal of the EL357N(B)(TA)-G chip is connected to +12VPS through resistor R52, the cathode of the OP1 input terminal is connected to PSWZFK11 through diode E9, the collector of the OP1 output terminal is connected to VCC-3.3V, and the emitter of the OP1 output terminal is connected to PSWZFK1.

[0055] Pin 2 of position detection switch J15 is connected to PSWZFK11.

[0056] The HKC-F Hall current sensor J18 is used to detect the current of the crushing and extrusion drive motor to prevent the motor from being damaged by overcurrent when the crushing head 43 is pressed down and gets stuck or pressed against hard raw coal or other hard rocks.

[0057] J10 is connected to the control signal input port of the crushing and extrusion drive motor of the coal crushing and extrusion device 23.

[0058] like Figure 8 As shown, the combined circuit of P521 chip, HFD4 / 5 relay, HF49FD / 012-1H11 relay, and CJ20-630A(220) module consists of two sets, used for forward and reverse control of the crushing and extrusion drive motor. Forward control lowers the crushing head 43 of the coal crushing and extrusion device 23, crushing the raw coal into smaller pieces. Reverse control raises the crushing head 43 of the coal crushing and extrusion device 23, facilitating the transfer of larger pieces of raw coal by the grinding disc assembly 49 to the area below the coal crushing and extrusion device 23 for crushing.

[0059] like Figure 8 As shown, the forward and reverse rotation control of the crushing and extrusion drive motor is achieved by adjusting the phase sequence of the motor drive power supply. Motors A, B, and C rotate forward, while motors C, B, and A rotate in reverse. Two contactors (K101 and K102) are used for driving, resulting in a simple, reliable, and inexpensive control circuit.

[0060] If both contactors engage simultaneously, phases A and C will be directly connected, causing a short circuit. To avoid this, conventional circuits pause for 2 seconds during phase commutation to allow for a delay between the opening of one contactor and the engagement of the other, preventing simultaneous engagement. The circuit also utilizes the normally closed auxiliary contacts of the contactors for interlocking, connecting the common terminal of contactor K101's coil in series with the normally closed auxiliary contact of contactor K102. When K102 engages, its normally closed auxiliary contact opens, preventing K101's coil from engaging. While these protection methods prevent most simultaneous engagement issues, problems can still occur if the U49 processor cannot detect the fault (due to the lack of a contactor detection circuit in U49) or if the auxiliary contacts become stuck or fail to engage.

[0061] This invention designs a circuit with multiple protection mechanisms, including mechanical protection, drive protection, and control protection. In addition to the two protection methods mentioned above, it also supports U49 for detecting whether the contactor is engaged and for interlocking control when the drive signal is interrupted.

[0062] The NO and NO terminals of contactor K101 are normally open auxiliary contacts. When K101 is energized, auxiliary contacts NO and NO conduct. After conduction, 5V flows through the normally open auxiliary contact NO to the input terminal of U36, and the output terminal of U36 conducts. After conduction, PSNetLabel34 becomes high. At this time, U49 detects that K101 is energized. During the period when K101 is energized, it will not control K102 to be energized. At the same time, 5V flows through U36 to the coil of K12, causing K12 to be energized. PSDJ2-FCTR is connected to pin 2 (normally closed pin) of K12, disconnected from the common terminal of pin 3 of K12. Pin 3 of K12 is connected to pin 4 of K12, disconnecting the drive signal of U37 and shorting it to GND, so that U37 cannot conduct regardless of interference or any drive, thus providing the function of preventing conduction at the drive layer.

[0063] J15 Figure 26 The squeezing device is close to switch 47.

[0064] K8 is an intermediate relay used for power amplification, driving AC 220V signals, and driving contactor coils.

[0065] like Figure 8As shown, the PSDJ2-ZCTR terminal of U49 is connected to R36. When R36 is high, the voltage flows through the normally closed terminal of K9 to the common terminal (pin 3), then to the primary side of U35. After the secondary side of U35 is turned on, +12VPS flows to the coil of K8 and the collector of Q3. Because Q3 is connected to the output of the secondary side of U35, the conduction of Q3 causes relay K8 to engage. The common terminal and normally open contact of K8 are connected, and the coil pin of K101 (PSK7NO) is connected to the N-LINE-IN (neutral line) through the normally open contact of K8 to the common contact. The other pin of the K101 coil is connected to the NC terminal of K102 (PSK102-NO), which is connected to the B-phase line of the mains (B-LINE-IN). Under normal conditions, K102 is not engaged, and its NO terminal is normally closed. At this time, the two pins of the K101 coil are connected to the 220V mains voltage, and the K101 coil is turned on. When K101 is engaged, its common terminals L1, L2, and L3 are connected to L2, L4, and L6 respectively, connecting the three-phase power supply to J10. J10 is connected to the control motor of the coal crushing and extrusion device 23, causing the coal crushing and extrusion device 23 to move downwards.

[0066] The nitrogen fire extinguishing valve control circuit includes P521 chip U3 and P521 chip U5. The anode of the input terminal of U3 is connected to MH1 through resistor R2, the cathode of the input terminal of U3 is connected to GND, the collector of the output terminal of U3 is connected to pin 1 of HF32FA / 012-ZS1 relay K1, pin 2 of K1 is connected to INPUT+, pin 5 of K1 is connected to INPUT+, and pin 4 of K1 is connected to pin 1 of QQP4 / 6 nitrogen tank control port J2.

[0067] The anode of the U5 input terminal is connected to MH2 through resistor R11, the cathode of the U5 input terminal is connected to GND, the collector of the U5 output terminal is connected to pin 1 of relay K2 of HF32FA / 012-ZS1, pin 2 of K2 is connected to INPUT+, pin 5 of K2 is connected to INPUT-, and pin 3 of K2 is connected to pin 2 of J2.

[0068] J2 is... Figure 18 Control port of nitrogen tank 9.

[0069] The temperature of the grinding disc is detected by the temperature sensing cable 16. It can be set to detect coal heating and ignition when the temperature of the grinding disc exceeds 200℃, control the sound and light alarm, and drive the nitrogen valve to spray nitrogen to extinguish the fire.

[0070] This invention is applied in high-power AC motor environments where external magnetic field interference is significant. To reduce the risk of the nitrogen extinguishing valve control circuit being falsely triggered by interference signals, two pins, MH1 and MH2, are used for driving. To drive nitrogen injection, MH1 must be set high while MH2 is low. The advantage of this design is that, in the event of interference, MH1 and MH2 are routed side-by-side in the circuit design. When interference signals are identical, MH1 and MH2 will either be both high or both low, avoiding a situation where one is high and the other low. Only when the correct driving signal arrives will they be at opposite levels.

[0071] Under normal conditions, MH1 is low, MH2 is high, U3 is not conducting, U5 is conducting, K1 is not energized, K2 is energized, pin 5 of K1 is not connected to the normally open pin 4, pin 1 of J2 is not connected to the power supply INPUT+, pin 2 of J2 is connected to pin 3 of K2. Because K2 is energized, its common terminal is not connected to the normally closed pin 3, pin 2 of J2 is not connected to the power supply negative terminal INPUT-. J2 is not connected to the drive power supply, and the nitrogen extinguishing device connected to J2 does not spray. When a fire is detected, when U49 drives MH1 to high and MH2 to low, U3 and U5 are on, pins 5 and 4 of K1 are connected, passing through pin 1 of J2 to the nitrogen extinguishing device, then to pin 2 of J2, and finally to pin 3 of K2. Because K2 is not engaged, pin 3, normally closed, is connected to pin 5. Pin 2 of J2 passes through pin 3 of K2 to pin 5 of K2, forming a circuit to the negative terminal INPUT- of the power supply. Pins 1 and 2 of J2 are powered to drive the nitrogen extinguishing device to trigger the spray for fire suppression.

[0072] The coolant pump control circuit includes an EL357 chip OP6. The anode of the OP6 input terminal is connected to SBKZ through a resistor R6, the cathode of the OP6 input terminal is connected to GND, the collector of the OP6 output terminal is connected to +12V2 through a resistor R5, the emitter of the OP6 output terminal is connected to the base of SS8050 transistor Q5, the emitter of Q5 is connected to GND, and the collector of Q5 is connected to XL1.

[0073] Pins 3 to 8 of HL2-PS-K relay K5 are connected to AC1-OUT2, AC2-OUT2, AC1-IN, AC2-IN, XL1, and +12V2 respectively; pins 1 and 2 of the coolant pump control port J9 are connected to AC1-OUT2 and AC2-OUT2 respectively.

[0074] J8 connects to the 220V AC power input, and J9 is... Figure 20 The control port of the coolant pump 56 on the coolant tank 10.

[0075] If the temperature sensing cable 16 detects a temperature exceeding 80 degrees Celsius, U49 controls the coolant pump 56 via SBKZ to start working, cooling the grinding roller sleeve 34 and preventing a fire caused by high temperature. Prolonged friction of the grinding roller sleeve 34 will cause its surface temperature to rise continuously.

[0076] The three-dimensional attitude sensor communication circuit includes a B0524S-1WR2 module PM1. Pin 2 of PM1 is connected to 5V. Pin 4 of PM1 is connected to pin 1 of the K7805-1000L module U29 through inductor L8. Pin 3 of U29 is connected to pin 3 of the XC6206P332MR module U10. Pin 2 of U10 is connected to +3.3V.

[0077] Pins 3 to 5 of the ADUM1301 chip U11 are connected to RTS1, TXD1, and RXD1 respectively. Pins 12 to 14 of U11 are connected to pins 1, 4, and 2 of the VP11 chip U13 respectively. Pin 7 of U13 is connected to pin 1 of the ACT45B-510-2P-TL003 common-mode filter L6 through resistor R68. Pin 2 of L6 is connected to AIOB1, pin 4 of L6 is connected to AIOA1, and pin 6 of U13 is connected to pin 3 of L6 through resistor R73.

[0078] Pins 2 and 3 of the WT-VB01-485 vibration sensor J5 are connected to AIOB1 and AIOA1 respectively.

[0079] like Figure 12 , 13 As shown, the three-dimensional attitude sensor communication circuit is configured with two identical circuits, which correspond to the two hub motor grinding roller modules 24 respectively.

[0080] The three-dimensional attitude sensor communication circuit is Figure 26 15. Three-dimensional attitude sensor module.

[0081] The WT-VB01-485 vibration sensor J5 is used to detect the change in the deviation angle when the hub motor grinding roller module 24 grinds raw coal, and to determine the volume of the raw coal based on the change.

[0082] U11 is an isolation module, U13 is an RS485 communication module, R68, R73, and L6 form an anti-interference circuit, and ZD1, ZD2, and ZD3 are overvoltage protection components. U11 protects U49 from interference from external RS485 connection lines. U11 is used for safety isolation, blocking interference signals to the right side of U11.

[0083] The grinding disc rotation control circuit includes a P521 chip U27. The anode of the input terminal of U27 is connected to MPK102-NC through diode D5. The emitter of the output terminal of U27 is connected to pin 1 of HFD4 / 5 relay K4 and one end of resistor R17. The other end of R17 is connected to MPNetLabel34. Pin 2 of K4 is connected to MPDJ2-ZCTR through resistor R18. Pin 3 of K4 is connected to the anode of the input terminal of P521 chip U31. The cathode of the input terminal of U31 is connected to pin 4 of K4. The collector of the output terminal of U31 is connected to +12VMP. The emitter of the output terminal of U31 is connected to the base of S8050 transistor Q1 through resistor R16. The emitter of Q1 is connected to GNDMP. The collector of Q1 is connected to MPXLA.

[0084] The controlled switch terminals of relay K3 in HF49FD / 012-1H11 are connected to N-LINE-IN and MPK7NO respectively, and the control terminals of K3 are connected to 12V and MPXLA respectively.

[0085] The L1, L3, and L5 ports of the CJ20-630A module K103 are connected to A-LINE-IN, B-LINE-IN, and C-LINE-IN respectively. The coil ports of K103 are connected to MPK102-NO and MPK7NO respectively. The first NO port of K103 is connected to MPK103-NC, the second NO port of K103 is connected to 5V, the first NC port of K103 is connected to MPK103-NO, and the second NC port of K103 is connected to B-LINE-IN. The L2, L4, and L6 ports of K103 are connected to pins 3, 2, and 1 of J3 respectively.

[0086] Pin 1 of the EWN10-24S12H module U39 is connected to INPUT+ via fuse F3 and diode D18 in sequence; pin 2 of U39 is connected to INPUT-; and pin 6 of U39 is connected to +12VMP.

[0087] Pin 4 of the H11L1 chip U20 is connected to MPPLUSA, and pin 2 of U20 is connected to MPINPUTA through resistor R106.

[0088] Pin 4 of the H11L1 chip U25 is connected to MPPLUSB, and pin 2 of U25 is connected to MPINPUTB through resistor R109.

[0089] Pins 2 and 3 of the rotary encoder J16 are connected to MPINPUTA and MPINPUTB respectively.

[0090] The anode of the OP19 input terminal of the EL357N(B)(TA)-G chip is connected to +12VMP through resistor R110, the cathode of the OP19 input terminal is connected to MPWZFK11 through diode E3, the collector of the OP19 output terminal is connected to VCC-3.3V, and the emitter of the OP19 output terminal is connected to MPWZFK1.

[0091] Pin 2 of position detection switch J17 is connected to MPWZFK11.

[0092] J16 is the rotary encoder interface that is paired with drive motor 8.

[0093] J3 is the control port for drive motor 8.

[0094] like Figure 14 As shown, the combination circuit of P521 (U27, U32), HFD4 / 5 (K4, K7), HF49FD / 012-1H11, and CJ20-630A (220) is of two types, used to drive the forward and reverse rotation control of motor 8, and to complete the forward and reverse rotation control of the grinding disc.

[0095] The control process of the combined circuit of P521, HFD4 / 5, HF49FD / 012-1H11, and CJ20-630A(220) has been explained in the aforementioned crushing head control circuit.

[0096] Position detection switch J17 is also known as grinding disc proximity switch 59.

[0097] U49 determines the zero-point position of the grinding disc via position detection switch J17. Based on the zero-point position, it begins rotation to process the raw coal. For example, the coal crushing and extrusion device 23 is at the zero-point of 240 degrees, the first hub motor grinding roller module 24 is at 120 degrees, and the second hub motor grinding roller module 24 is at 360 degrees, with the zero point as the calibration reference. Rotation code J16 can only record an increment and does not have a zero-point position. An increment alone cannot determine the position of the hub motor grinding roller module 24 and the coal crushing and extrusion device 23. The zero-point position has a constant angle relative to the hub motor grinding roller module 24 and the coal crushing and extrusion device 23. Using rotation code J16, any position on the grinding disc can be controlled to rotate to the designated hub motor grinding roller module 24 and the coal crushing and extrusion device 23 for operation.

[0098] The hub motor control circuit includes an LM358D module U16. Pins 1 and 2 of U16 are connected to VDIN-LG. Pin 3 of U16 is connected to one end of resistor R26 and one end of resistor R28 through resistor R27. The other end of R26 is connected to LGOUT, and the other end of R28 is connected to GND.

[0099] Pins 1-3, 9, and 10 of the AD7788ARMZ-REEL chip U15 are connected to CLK-LG, CS-LG, VDIN-LG, DOUT-LG, and DIN-LG respectively.

[0100] Pin 3 of the HKC-F Hall current sensor J19 is connected to LGOUT;

[0101] The anode of the input terminal of P521 chip U42 is connected to LGK102-NC. The emitter of the output terminal of U42 is connected to pin 1 of HFD4 / 5 relay K14 and one end of resistor R30. The other end of R30 is connected to LGNetLabel34. Pin 2 of K14 is connected to LGDJ2-ZCTR through resistor R31. Pin 3 of K14 is connected to the anode of the input terminal of P521 chip U43. The cathode of the input terminal of U43 is connected to pin 4 of K14. The collector of the output terminal of U43 is connected to +12VLG. The emitter of the output terminal of U43 is connected to the base of S8050 transistor Q7 through resistor R29. The emitter of Q7 is connected to GNDLG. The collector of Q7 is connected to LGXLA.

[0102] The controlled switch terminals of relay K13 in HF49FD / 012-1H11 are connected to N-LINE-IN and LGK7NO respectively, and the control terminals of K13 are connected to 12V and LGXLA respectively.

[0103] The L1, L3, and L5 ports of the CJ20-630A module K107 are connected to A-LINE-IN, B-LINE-IN, and C-LINE-IN respectively. The coil ports of K101 are connected to LGK102-NO and LGK7NO respectively. The first NO port of K101 is connected to LGK101-NC, the second NO port of K101 is connected to 5V, the first NC port of K101 is connected to LGK101-NO, and the second NC port of K101 is connected to B-LINE-IN. The L2, L4, and L6 ports of K101 are connected to pins 3, 2, and 1 of the J20 module respectively.

[0104] Pin 1 of the EWN10-24S12H module U46 is connected to INPUT+ via fuse F4 and diode D23 in sequence; pin 2 of U46 is connected to INPUT-; and pin 6 of U46 is connected to +12VLG.

[0105] Pin 4 of the H11L1 chip U48 is connected to LGPLUSA, and pin 2 of U48 is connected to LGINPUTA through resistor R64.

[0106] Pin 4 of the H11L1 chip U47 is connected to LGPLUSB, and pin 2 of U47 is connected to LGINPUTB through resistor R62.

[0107] Pins 2 and 3 of the rotary encoder J22 are connected to LGINPUTA and LGINPUTB respectively.

[0108] J19 is a Hall current sensor that is paired with the hub motor in the hub motor grinding roller module 24.

[0109] J20 is the control interface for the hub motor in the hub motor grinding roller module 24.

[0110] Figure 16 , 17 Each hub motor has two corresponding grinding roller modules. The combined circuits of P521, HFD4 / 5 (K14), HF49FD / 012-1H11, and CJ20-630A (220) in each module are of two types, used for the forward and reverse rotation control of the hub motor, thus controlling the forward and reverse rotation of the grinding roller sleeve 34. When the grinding roller sleeve 34 is stuck by a large coal block, it can automatically free itself by rotating the grinding roller sleeve 34.

[0111] The control process of the combined circuit of P521, HFD4 / 5, HF49FD / 012-1H11, and CJ20-630A(220) has been explained in the aforementioned crushing head control circuit.

[0112] When a large amount of raw coal gets stuck on the grinding roller sleeve 34, the operating current of the hub motor increases sharply. Current transformers J19 and U49 detect this current change and control the hub motor to stop rotating and reverse, thus extricating it from the stuck state. Each time power is applied, the grinding disc rotates automatically. When J17 is triggered, this point is defined as zero degrees, and the counting pulses of the rotary encoder J16 are cleared. The grinding disc then rotates and counts the pulses from the rotary encoder. U49 accumulates the pulses sent by encoder J16 and determines the current rotation angle of the grinding disc based on the current count value. The pulse encoder sends approximately 36,000 pulses per revolution of the grinding disc, with 1,000 pulses representing 1 degree. The positions of the hub motor grinding roller module 24 and the coal crushing and extrusion device 23 are both at a fixed angle to the zero-degree position of the grinding disc. When a large chunk of raw coal gets stuck in the grinding roller sleeve 34, after detecting the position of the large chunk, U49 records which hub is currently stuck (the hub whose motor current increases sharply indicates which hub is stuck). The grinding disc is then controlled to move the larger chunk of raw coal under the coal crushing and extrusion device 23. The forward and reverse rotation of the coal crushing and extrusion device 23 and the drive motor 8 is controlled, causing the coal crushing and extrusion device 23 to repeatedly press downwards, performing repeated crushing operations on a small area. The raw coal falls in small increments from the center, and subsequent falling coal will impact the larger chunks into the outer crushing area of ​​the grinding disc. By controlling the forward and reverse rotation of the hub motor and drive motor 8, as well as the raising and lowering of the pressure frame 12, the stuck coal chunk is separated from the grinding roller sleeve 34, and the grinding disc assembly 49 moves the large coal chunk under the coal crushing and extrusion device 23. When the grinding roller sleeve 34 presses down on a larger piece of raw coal, it will be determined by the detection value of the three-dimensional attitude sensor module 15. At this time, the current rotation angle of the grinding disc is recorded, and the angle of the larger piece of raw coal at the reference zero point position of the grinding disc is determined, that is, the position of the larger piece of raw coal is detected.

[0113] U49 drives the grinding roller sleeve 34 to rotate clockwise via LGDJ2-ZCTR, and U49 drives the grinding roller sleeve 34 to rotate counterclockwise via LGDJ2-FCTR. When both LGDJ2-ZCTR and LGDJ2-FCTR are low, the hub motor stops rotating. Taking the hub motor rotating from forward to stop as an example, initially LGDJ2-FCTR is always low, and LGDJ2-ZCTR is initially high, so the hub motor rotates. When LGDJ2-ZCTR changes from high to low, U43 enters the off state, R129 is low, Q7 enters the cutoff region, Q7 is off, and because Q7 is off, the K13 coil is released and does not engage, and the common terminal and normally open terminal of K13 are disconnected.

[0114] When the coil pin LGK7NO of K107 is disconnected from the N-LINE-IN, the L1 port of K107 is disconnected from the L2 port, the L3 port from the L4 port, and the L5 port from the L6 port. The hub motor loses its connection to the power supply and stops rotating.

[0115] Through the three-dimensional attitude sensor module 15 (i.e. Figure 12 (J5) Collect the offset angle of the grinding roller frame 33 to determine whether there is a large coal block passing through the lower end of the grinding roller sleeve 34, and lift the grinding roller sleeve 34. Since the grinding roller frame 33 is connected to the pressure frame 12 through the grinding roller frame hinge 32, the grinding roller frame 33 is lifted.

[0116] like Figure 16 As shown, when R31 is high, the hub motor rotates forward; when R56 is high, the hub motor rotates in reverse; when both R31 and R56 are low, the hub motor stops rotating.

[0117] U49's LGDJ2-ZCTR is connected to R31. When R31 is high, the voltage flows through the normally closed terminal of K14 to the common terminal (pin 3), then to the primary side of U43. After the secondary side of U43 is turned on, +12VLG1 flows to the coil of K13 and the collector of Q7. Because Q7 is controlled by the output of the secondary side of U43, Q7's conduction causes relay K13 to engage. The common terminal and normally open contact of K13 are connected. The coil pin of K107 (LGK7NO) is connected to the N-LINE-IN (neutral line) through the normally open contact of K13 to the common contact. The other pin of the K107 coil is connected to the NC terminal of K106 (LGK102-NO), which is connected to the B-LINE-IN (phase B line). Under normal conditions, K106 is not engaged, and its NO terminal is normally closed. At this time, the two pins of the K107 coil are connected to the 220V AC mains, and the K107 coil is turned on. When K107 is engaged, its common terminals L1, L2, and L3 are connected to L2, L4, and L6 respectively, connecting the three-phase power supply to J20. J20 is connected to the hub motor, which rotates in the forward direction.

[0118] The drive motor that drives the grinding disc assembly to rotate is located at the lower end of the outer casing. The upper end of the outer casing is provided with a coal inlet and a coal outlet, and the lower part of the outer casing is provided with an air inlet. A pressure frame is provided in the upper part of the inner casing. The end of the pressure frame is connected to the upper end of a hydraulic rod. The hydraulic cylinder of the hydraulic rod is located on a base in the lower part of the inner casing. The lower end of the pressure frame is connected to the hub motor grinding roller module and the coal crushing and extrusion device. The grinding disc assembly is located below the pressure frame.

[0119] The beneficial effects of this invention.

[0120] The data control and processing circuit of this invention transmits motor operating status, detected temperature, and alarm information to the monitoring center via an Ethernet circuit.

[0121] The power supply circuit of this invention provides the required power voltage to each part of the circuit.

[0122] The touch screen control circuit of this invention can display relevant detection and alarm information; it can also perform related controls, such as controlling the crushing head, grinding disc, or fire extinguishing valve.

[0123] The audible and visual alarm circuit of this invention is used to issue alarm information.

[0124] The temperature acquisition circuit of this invention is used to acquire the temperature of the grinding disc.

[0125] The data control processing circuit of this invention controls the crushing head through the crushing head control circuit.

[0126] The data control processing circuit of this invention controls the opening and closing of the nitrogen valve through the nitrogen fire extinguishing valve control circuit to extinguish the fire.

[0127] The data control processing circuit of this invention controls the circulation of coolant through a coolant pump control circuit to cool the grinding roller sleeve.

[0128] The data control processing circuit of this invention acquires the attitude of the hub motor grinding roller module through a three-dimensional attitude sensor communication circuit and performs corresponding control.

[0129] The data control processing circuit of this invention controls the movement of the grinding disc through a grinding disc rotation control circuit.

[0130] The data control processing circuit of this invention controls the operation of the hub motor through the hub motor control circuit. Attached Figure Description

[0131] Figure 1 This is the schematic diagram of the power supply circuit of the present invention.

[0132] Figure 2 This is a schematic diagram of the touch screen control circuit of the present invention.

[0133] Figure 3 This is the circuit diagram of the sound and light alarm of the present invention.

[0134] Figure 4 , 5 This is a schematic diagram of the data control and processing circuit of the present invention.

[0135] Figure 6 This is the schematic diagram of the Ethernet circuit of this invention.

[0136] Figure 7 This is a schematic diagram of the temperature acquisition circuit of the present invention.

[0137] Figure 8 , 9 This is a schematic diagram of the control circuit for the crushing head of this invention.

[0138] Figure 10 This is a schematic diagram of the nitrogen fire extinguishing valve control circuit of the present invention.

[0139] Figure 11 This is a schematic diagram of the coolant pump control circuit of the present invention.

[0140] Figure 12 ,13 This is a schematic diagram of the communication circuit for the three-dimensional attitude sensor of this invention.

[0141] Figure 14 , 15 This is a schematic diagram of the grinding disc rotation control circuit of the present invention.

[0142] Figure 16 , 17 This is a schematic diagram of the hub motor control circuit of the present invention.

[0143] Figure 18 This is an external view of the coal mill of the present invention.

[0144] Figure 19 This is a cross-sectional view of the coal mill of the present invention.

[0145] Figure 20 This is a schematic diagram of the internal structure of the coal mill of the present invention.

[0146] Figure 21 This is a cross-sectional view of the grinding disc transmission part of the present invention.

[0147] Figure 22 for Figure 21 Enlarged view of part A.

[0148] Figure 23 This is a schematic diagram of the hub motor grinding roller module of the present invention.

[0149] Figure 24 This is a cross-sectional view of the grinding roller of the hub motor of the present invention.

[0150] Figure 25 This is a schematic diagram of the transmission pipeline of the present invention.

[0151] Figure 26 This is a diagram showing the arrangement of the proximity switch and three-dimensional attitude sensor module of the present invention.

[0152] Figure 27 This is a front view of the liner of the present invention.

[0153] Figure 28 This is a diagram showing the extended state of the coal crushing and extrusion device of the present invention.

[0154] Figure 29 This is a diagram showing the contraction state of the coal crushing and extrusion device of the present invention.

[0155] Figures 18-29 The names of the components are as follows:

[0156] 1. Coal inlet; 2. Coal outlet; 3. Top support plate; 4. Top outer shell; 5. Middle outer shell; 6. Lower outer shell; 7. Air inlet; 8. Drive motor; 9. Nitrogen tank; 10. Coolant tank; 11. Bottom casing; 12. Pressure frame; 13. Transmission pipeline; 14. Coil gatherer; 15. Three-dimensional attitude sensor module; 16. Temperature sensing cable; 17. Temperature sensing cable cover plate; 18. Hydraulic rod; 19. Hydraulic cylinder; 20. Base; 21. Reducer housing; 22. Pulse jet plate; 23. Coal block crushing and extrusion device; 24. Hub motor grinding roller module; 25. Liner plate; 26. Rotating body; 27. Reduction gear set; 28. Coupling; 29. ​​Motor shaft; 30. Grinding disc base; 31. Grinding roller motor shaft; 32. Hinge; 33. Grinding roller frame; 34. Grinding roller sleeve; 35. Grinding roller front cover plate; 36. Coolant return pipe; 37. Coolant inlet pipe; 38. Grinding roller motor cover; 39. Universal joint. 40. Sealing gasket, 41. Grinding roller motor housing, 42. Injection nozzle, 43. Crushing head, 44. Front ball bearing, 45. Rear cover plate of grinding roller motor, 46. Rear ball bearing, 47. Proximity switch of extrusion device, 48. Inspection port, 49. Grinding disc assembly, 50. Vertical drive shaft, 51. Coolant tank, 52. Hydraulic coolant inlet pipe, 53. Hydraulic coolant outlet pipe, 54. Mounting plate, 55. Mounting groove, 56. Coolant pump, 57. Conical protrusion, 58. Trigger protrusion of grinding disc proximity switch, 59. Grinding disc proximity switch, 60. Coal inlet pipe, 61. Inverted frustum-shaped cylinder, 62. Top support plate connecting bolt, 63. Strip opening, 64. Nitrogen transmission pipe, 65. Upper flange, 66. Lower flange, 67. Screw, 68. Trigger block of extrusion device proximity switch, 69. Cyclone separator, 70. Upper inlet of cyclone separator, 71. Lower slag discharge port of cyclone separator. Detailed Implementation

[0157] The mechanical structure of the coal mill used in conjunction with the coal mill overheat monitoring and protection device of the present invention includes an outer shell, with a coal inlet 1 and a coal outlet 2 at the upper end of the outer shell, an air inlet 7 at the lower part of the outer shell, and a drive motor 8 at the lower end of the outer shell for driving the grinding disc assembly 49 to rotate.

[0158] A pressure frame 12 is provided in the upper part of the outer shell. The end of the pressure frame 12 is connected to the upper end of the hydraulic rod 18. The hydraulic cylinder 19 of the hydraulic rod 18 is provided on the base 20 in the lower part of the outer shell. The lower end of the pressure frame 12 is connected to the hub motor grinding roller module 24 and the coal crushing and extrusion device 23. A grinding disc assembly 49 is provided below the pressure frame 12.

[0159] Large pieces of raw coal are first crushed by the coal crushing and extrusion device 23, and then crushed by the hub motor grinding roller module 24, which improves grinding efficiency, reduces the occurrence of jamming, and improves the overall working efficiency and reliability of the equipment.

[0160] By adjusting the length of the hydraulic rod 18, the distance between the hub motor grinding roller module 24 and the grinding disc assembly 49 is controlled, thereby improving the crushing effect and efficiency.

[0161] Coal inlet 1 is used for feeding raw coal. The raw coal enters the coal grinding area inside the equipment through this channel and begins the crushing and grinding process.

[0162] The drive motor 8 is the main power source of the equipment, driving the grinding disc assembly 49 to rotate.

[0163] Air is introduced through air inlet 7, and the treated coal powder is blown out from coal outlet 2.

[0164] A top support plate 3 is provided on the upper end of the top outer shell 4, and the coal inlet 1 and the coal outlet 2 are located on the top support plate 3. The top support plate 3 and the top outer shell 4 provide stable support and protection for the equipment, preventing interference from the external environment.

[0165] The top outer shell 4 has an inverted frustum-shaped cylinder 61 in the middle. The upper end of the inverted frustum-shaped cylinder 61 is connected to the top support plate 3 via a top support plate connecting bolt 62. Multiple strip-shaped openings 63 are evenly distributed circumferentially on the lower sidewall of the inverted frustum-shaped cylinder 61. Airflow carrying pulverized coal enters the coal outlet 2 simultaneously through the lower opening of the inverted frustum-shaped cylinder 61 and the strip-shaped openings 63, improving air circulation. The strip-shaped openings 63 help to ensure that the airflow flows out of the outlet evenly, rather than concentrating in certain areas; this promotes uniform airflow. The strip-shaped openings 63 can effectively regulate the airflow direction, making the airflow more evenly distributed in the outlet area.

[0166] A cyclone separator 69 is installed below the inverted frustum-shaped cylinder 61 inside the outer shell. The upper outlet of the cyclone separator 69 is connected to the inlet of the inverted frustum-shaped cylinder 61. Air carrying coal dust enters from the upper inlet 70 of the cyclone separator. Coal dust that meets the required size is discharged from the upper outlet of the cyclone separator 69, while coal dust that does not meet the required size (larger particles) falls back onto the grinding disc assembly 49 from the lower slag discharge port 71 of the cyclone separator for further grinding.

[0167] There are two coal outlets 2, which are respectively located on both sides of the coal inlet 1. The two coal outlets 2 are located on both sides of the coal inlet 1 to increase the coal output efficiency.

[0168] The air inlet pipe at air inlet 7 is inclined from the bottom inside to the top outside.

[0169] The pressure frame 12 is triangular, with three sets of hydraulic rods 18 and hydraulic cylinders 19, one coal crushing and extrusion device 23, and two hub motor grinding roller modules 24. Two hub motor grinding roller modules 24 are connected to the lower ends of two sides of the triangular pressure frame 12, and the coal crushing and extrusion device 23 is connected to the lower end of the other side of the triangular pressure frame 12. The triangular design of the pressure frame 12 facilitates the installation of the hub motor grinding roller modules 24, evenly distributes gravity, and facilitates the arrangement of the hydraulic rods 18.

[0170] The hub motor grinding roller module 24 includes a U-shaped grinding roller frame 33. Hinges 32 are provided at the upper ends of both sides of the grinding roller frame 33. The upper ends of the hinges 32 are connected to the pressure frame 12 via fasteners, and the lower ends of the hinges 32 are hinged to the upper ends of the grinding roller frame 33. The middle part of the grinding roller frame 33 is fixedly connected to one end of the grinding roller motor shaft 31. The other end of the grinding roller motor shaft 31 is placed inside the front end of the grinding roller motor housing 41 and connected to the front end of the grinding roller motor housing 41 via a front ball bearing 44. The rear end of the grinding roller motor housing 41 is connected to a grinding roller motor rear cover plate 45 via fasteners. The middle part of the grinding roller motor shaft 31 passes through the middle of the grinding roller motor rear cover plate 45 and is connected to the grinding roller motor rear cover plate 45 via a rear ball bearing 46. A grinding roller sleeve 34 is provided on the outer periphery of the grinding roller motor housing 41. The lower ends of the hinges 32 are hinged to the upper ends of the grinding roller frame 33. The grinding roller sleeve 34 can change its direction of movement during operation to adapt to the size of the coal block and perform grinding work.

[0171] The front end of the grinding roller sleeve 34 is provided with an annular coolant groove 51, and the front end of the coolant groove 51 is provided with a grinding roller front cover plate 35. A sealing gasket 40 is provided between the grinding roller front cover plate 35 and the end face of the coolant groove 51. The grinding roller front cover plate 35 and the grinding roller sleeve 34 are connected by fasteners. The coolant groove 51 is connected to one end of the coolant inlet pipe 37 through one side, and the coolant groove 51 is connected to one end of the coolant return pipe 36 through the other side.

[0172] The stator, windings, and rotor structure within the grinding roller motor housing 41 is a conventional structure for existing hub motors. This invention modifies the existing hub motor design by making the grinding roller sleeve 34 a hollow structure (i.e., an annular coolant groove 51) for coolant flow. The grinding roller motor shaft 31 acts as the hub motor's rotating shaft, fixedly connected to the grinding roller frame 33. The grinding roller motor shaft 31 does not rotate; instead, the grinding roller motor housing 41 rotates around it, driving the grinding roller sleeve 34 to rotate. After prolonged use, the grinding roller sleeve 34 can be replaced with a new one. The grinding roller sleeve 34 can be made of alloy steel or cast iron. Figure 24 As shown, when the grinding roller sleeve 34 needs to be replaced, separate the grinding roller motor rear cover plate 45 from the grinding roller motor housing 41, remove the grinding roller sleeve 34, replace it with a new grinding roller sleeve 34, and then connect the grinding roller motor rear cover plate 45 to the grinding roller motor housing 41.

[0173] The other end of the coolant inlet pipe 37 and the other end of the coolant return pipe 36 are both connected to a universal joint 39.

[0174] The upper end of the pressure frame 12 is provided with a transmission pipeline 13, which includes a hydraulic coolant inlet pipe 52, a hydraulic coolant outlet pipe 53, and a nitrogen transmission pipe 64. One end of the hydraulic coolant inlet pipe 52 is connected to the coolant inlet pipe 37 via a universal joint, and one end of the hydraulic coolant outlet pipe 53 is connected to the coolant return pipe 36 via a universal joint. The other end of the hydraulic coolant inlet pipe 52 is connected to the oil outlet of the coolant tank 10, and the other end of the hydraulic coolant outlet pipe 53 is connected to the oil return port of the coolant tank 10. The inlet of the nitrogen transmission pipe 64 is connected to the outlet of the nitrogen tank 9, and the outlet of the nitrogen transmission pipe 64 faces the grinding disc assembly 49. The portion of the transmission pipeline 13 passing through the pressure frame 12 can be arranged inside the pressure frame 12.

[0175] The outer casing includes a top outer casing 4, a middle outer casing 5, a lower outer casing 6, and a bottom casing 11. An inspection port 48 is provided on the lower outer casing 6. A nitrogen tank 9 and a coolant tank 10 are located at the inspection port 48, and an air inlet 7 is located below the inspection port 48.

[0176] The top outer shell 4 and the middle outer shell 5 are connected by an upper flange 65 and bolts, and the middle outer shell 5 and the lower outer shell 6 are connected by a lower flange 66 and bolts. The top outer shell 4 has an arc-shaped structure, and the middle outer shell 5 has an inverted frustum-shaped structure. The lower end dimension of the top outer shell 4 corresponds to the upper end dimension of the middle outer shell 5.

[0177] The coal mill is a large piece of equipment, with its outer casing divided into four parts for easy processing and installation. These four parts can be connected using high-strength bolts. The top support plate 3 supports the coal inlet 1 and the coal outlet 2. The top outer casing 4 is the largest, increasing the internal space. Due to Bernoulli's principle, the air velocity at the coal outlet 2 increases coal extraction efficiency. The middle outer casing 5 and the lower outer casing 6 provide a smooth transition, while also protecting the internal structure of the coal mill and enhancing the overall structural strength of the equipment. The bottom casing 11 provides bottom support for the equipment and houses the base 20 and hydraulic cylinder 19, ensuring stable operation of the equipment.

[0178] The inspection port 48 has a four-sided frame structure, and the nitrogen tank 9 and coolant tank 10 are located inside the four-sided frame structure.

[0179] The four-sided frame structure is used to store the nitrogen tank 9 and the coolant tank 10. Meanwhile, the inspection port 48 allows for routine manual monitoring of the equipment. A small, operable door is provided on the lower outer casing 6 at the inspection port 48. The nitrogen tank 9 and coolant tank 10 are installed close to the pressure frame 12, resulting in a short transmission distance and increased cooling and fire suppression efficiency.

[0180] A three-dimensional attitude sensor module 15 is installed on the grinding roller frame 33. The three-dimensional attitude sensor module 15 monitors the angle change of the hub motor grinding roller module 24 and detects the size of the coal block.

[0181] The grinding disc assembly includes a grinding disc base 30, with a rotating body 26 at the center of the base 30. The rotating body 26 has a conical protrusion 57 at its upper center. An annular liner 25 is arranged around the center of the rotating body 26 at its upper end. The outer periphery of the upper surface of the liner 25 is an arc surface that transitions from the lower inner part to the upper outer part. The rotating body 26 and the grinding disc base 30 are interference-fitted together, and the shaft end is axially fixed. The rotating body 26 and the grinding disc base 30 rotate together.

[0182] The liner 25 protects the grinding disc structure and provides wear resistance, extending the equipment's service life. The liner 25 is connected to the grinding disc base 30 via fasteners. If the liner 25 breaks after prolonged use, it can be separated from the grinding disc base 30 and replaced with a new one. Adjusting the length of the hydraulic rod 18 controls the distance between the grinding roller sleeve 34 and the liner 25, improving the compaction effect and efficiency.

[0183] The upper periphery of the rotating body 26 is provided with an annular spray plate 22. The upper surface of the spray plate 22 is an arc surface that transitions from the inner bottom to the outer top. The upper surface of the spray plate 22 is provided with a spray nozzle 42, and the spray direction of the spray nozzle 42 is upward. The air inlet of the spray plate 22 is connected to the air inlet 7. The coal inlet 1 is located at the upper end of the coal inlet pipe 60. The lower end of the coal inlet pipe 60 is located below the pressure frame 12, directly opposite the center of the grinding disc assembly 49. The spray nozzle 42 can be connected to the vertical channels inside the spray plate 22. Each vertical channel is then connected to the horizontal channel, and the horizontal channel is connected to the air inlet 7.

[0184] The injection plate 22 has two rings of injection nozzles 42 evenly distributed on both the inner and outer sides. The small diameter and multiple holes are designed to prevent coal blocks from falling, increase the injection area, and increase the injection efficiency.

[0185] The outer end of the spray plate 22 is fixedly connected to the inner wall of the lower outer shell 6. During the operation of the equipment, the spray plate 22 does not rotate, while the liner 25 rotates with the rotating body 26.

[0186] Cold air is introduced through air inlet 7, which is used to supply air to the injection plate 22. The air flows upward along the injection nozzle 42, blowing up the ground coal powder.

[0187] Under the combined action of centrifugal force (generated by the rotation of the rotating body 26) and continuous coal feeding through the coal inlet pipe 60, the raw coal diffuses from the center of the grinding disc assembly 49 outwards. The pulverized coal injection plate 22 blows the coal powder upwards, and the upward-blowing air from the pulverized coal injection plate 22 carries the coal powder out of the coal outlet 2. Figure 19 As shown, the arrows indicate the wind's path.

[0188] The blow plate 22 has an internal air guide channel that connects to each blow nozzle.

[0189] The blow plate 22 is used to optimize airflow distribution, so that cold air is blown evenly onto the coal powder particles, helping the coal powder to be discharged from the equipment more efficiently.

[0190] The upper inner side of the liner 25 is flat. A ring-shaped groove for placing a temperature-sensing cable cover is located on this flat surface around the center of the rotating body 26. A spiral groove for placing a temperature-sensing cable is located on the bottom surface of this groove around the center of the rotating body 26. A temperature-sensing cable 16 is placed inside the groove, and a temperature-sensing cable cover 17 is placed inside the groove. The temperature-sensing cable cover 17 is connected to the liner 25 by screws 67. The temperature-sensing cable 16 is installed to monitor temperature changes inside the coal mill in real time. In emergencies, fire can be extinguished via a nitrogen tank 9 and a nitrogen transmission pipe 64.

[0191] The injection plate 22 is disposed on the outer periphery of the liner 25, with the upper end of the liner 25 lower than the upper end of the injection plate 22. This lower upper end of the liner 25 ensures that the pulverized coal is adequately blown onto the liner 22.

[0192] The grinding disc base 30 is located at the upper end of the reducer housing 21, and the lower part of the grinding disc base 30 is connected to the reducer housing 21 through a bearing; the lower middle part of the rotating body 26 is connected to the upper end of the vertical transmission shaft 50, and the lower end of the vertical transmission shaft 50 is connected to the motor shaft 29 of the drive motor 8 through a reduction gear set 27 and a coupling 28; the vertical transmission shaft 50 is connected to the bracket inside the reducer housing 21 through a bearing.

[0193] The coal crushing and extrusion device 23 includes a crushing and extrusion outer shell 23-1, a first-stage telescopic shell 23-5, a second-stage telescopic shell 23-6, and a third-stage telescopic shell 23-7. A crushing and extrusion device proximity switch 47 is provided on the outer wall of the crushing and extrusion outer shell 23-1. The middle part of the crushing and extrusion outer shell 23-1 is connected to the first-stage telescopic threaded rotating shaft 23-2 through a bearing. The first-stage telescopic threaded rotating shaft 23-2 is connected to the output shaft of the crushing and extrusion drive motor. The crushing and extrusion outer shell and the crushing and extrusion drive motor are connected to the pressure frame 12.

[0194] The upper middle part of the first-stage telescopic shell 23-5 is provided with a threaded hole corresponding to the first-stage telescopic threaded rotating shaft 23-2. The outer wall of the first-stage telescopic shell 23-5 is connected to the inner wall of the crushing and extrusion shell 23-1 through a slider groove structure. The upper middle part of the first-stage telescopic shell 23-5 has a downwardly extending connecting part. This connecting part is connected to the upper end of the second-stage telescopic rotating shaft 23-3 through a first-stage bearing 23-8. The upper end of the second-stage telescopic threaded rotating shaft 23-3 is fixedly connected to the lower end of the first-stage telescopic threaded rotating shaft 23-2.

[0195] The upper middle part of the secondary telescopic shell 23-6 is provided with a threaded hole corresponding to the secondary telescopic threaded rotating shaft 23-3. The outer wall of the secondary telescopic shell 23-6 is connected to the inner wall of the primary telescopic shell 23-5 through a slider groove structure. The upper middle part of the secondary telescopic shell 23-6 has a downwardly extending connecting part. This connecting part is connected to the upper end of the tertiary telescopic rotating shaft 23-4 through the secondary bearing 23-9. The upper end of the tertiary telescopic rotating shaft 23-4 is fixedly connected to the lower end of the secondary telescopic threaded rotating shaft 23-3.

[0196] The upper end of the third-stage telescopic housing 23-7 is provided with a threaded hole corresponding to the third-stage telescopic rotating shaft 23-4. The lower end of the third-stage telescopic housing 23-7 is the crushing head 43. The side wall of the crushing head 43 is provided with a trigger block 68 for the extrusion device proximity switch corresponding to the extrusion device proximity switch 47. The outer wall of the third-stage telescopic housing 23-7 is connected to the inner wall of the second-stage telescopic housing 23-6 through a slider groove structure. The trigger block 68 of the extrusion device proximity switch can be a set screw.

[0197] The slider-groove structure restricts the telescopic shell to vertical movement only, preventing rotation. For example, a slider is installed on the outside of the primary telescopic shell 23-5, and a strip-shaped groove is installed on the inner wall of the crushing and extrusion shell 23-1. The slider slides within the strip-shaped groove, which is positioned along the length of the crushing and extrusion shell 23-1. The rotation of the primary telescopic threaded rotating shaft 23-2 drives the rotation of the secondary telescopic threaded rotating shaft 23-3, and so on. This ensures the telescopic shell can only move vertically, enabling the crushing head 43 to rise and fall, thus crushing large coal blocks.

[0198] The proximity switch 47 of the extrusion device cooperates with the trigger block 68 of the proximity switch of the extrusion device to detect the position of the crushing head 43.

[0199] A grinding disc proximity switch 59 is provided on the spray plate 22, and a triggering protrusion 58 for the grinding disc proximity switch is provided on the outer end of the liner 25 corresponding to the grinding disc proximity switch 59. The grinding disc proximity switch 59 is used to detect the rotation angle of the grinding disc.

[0200] By setting up proximity switches 47 for the extrusion device and 59 for the grinding disc, the crushing of large coal pieces in the coal mill can be precisely controlled, thereby improving the working efficiency of the coal mill.

[0201] The outer side of the coal crushing and extrusion device 23 is provided with a mounting plate 54 for the extrusion device proximity switch 47, and the outer side of the injection plate 22 is provided with a mounting groove 55 for the grinding disc proximity switch 59.

[0202] The external wiring of the temperature sensing cable 16, the external wiring of the proximity switch, and the signal transmission of the three-dimensional attitude sensor module 15 can be transmitted via Bluetooth or cable. For example, the wiring of the three-dimensional attitude sensor module 15 can be routed through the wiring channels on the grinding roller frame 33, the pressure frame 12, and the inspection port 48.

[0203] Raw coal enters the coal mill through inlet 1 and falls onto the grinding disc assembly 49 under gravity. The grinding disc is designed with conical protrusions 57, where the coal lumps are initially impacted and compressed, achieving preliminary crushing. This design allows some coal lumps to undergo coarse crushing in the early stages of entering the equipment, contributing to improved subsequent grinding efficiency. However, for larger coal lumps, gravity alone is insufficient for crushing; in this case, the grinding disc continues to feed the coal lumps to the coal lump crushing and compression device 23.

[0204] When the uncrushed large coal blocks are conveyed by the rotating grinding disc to the area below the coal crushing and extrusion device 23, the device further and precisely crushes the coal blocks. The coal crushing and extrusion device 23 is equipped with an extrusion device proximity switch 47 (i.e., Figure 9 (J15) The proximity switch 47 of the extrusion device works in conjunction with the trigger block 68 of the proximity switch to calibrate the zero-point position, ensuring that the crushing head 43 always starts working from the accurate initial position. When the equipment is powered on or started, the system automatically detects whether the position of the crushing head 43 is at the zero point; if not, it returns to its original position. When coal enters the crushing area, the circuit drives the crushing head 43 to descend and perform the crushing operation.

[0205] To ensure crushing accuracy, the crusher head control circuit is equipped with a rotary encoder J13 and a current monitoring device (i.e., a Hall current sensor J18). The encoder records the number of descent revolutions of the crusher head 43, and J18 monitors the current of the vertical motion drive motor of the crusher head 43. Revolution control: When the encoder reaches the set value, crushing is complete and the descent of the crusher head 43 stops. This set value indicates that the coal block has been crushed to the required diameter.

[0206] Current monitoring: In case of current overload, the equipment will trigger repeated crushing actions of the crushing head 43 until the rated number of revolutions is reached to avoid motor overload damage. In this way, it is ensured that the coal is effectively crushed to the appropriate size.

[0207] After the large coal blocks processed by the coal crushing and extrusion device 23 are further crushed, they are conveyed to the hub motor grinding roller module 24 for fine grinding by the rotation of the rotating body 26. The hub motor grinding roller module 24 rotates in coordination with the rotation of the rotating body 26, allowing control to align the rotation direction of the hub motor grinding roller module 24 with the rotation direction of the liner plate 25, thus crushing the coal blocks into coal powder. The grinding disc proximity switch 59 on the blower plate 22 (i.e.,...) Figure 15 J17 in the model can control the rotation angle of the rotating body 26, adjust the grinding path of the coal block, and further improve the grinding efficiency. At the same time, the grinding roller frame 33 is equipped with a three-dimensional attitude sensor module 15, which monitors the deviation angle of the hub motor grinding roller module 24 in real time, ensuring that the hub motor grinding roller module grinds the coal block evenly, achieving the ideal coal grinding effect and high-efficiency coal grinding.

[0208] To control the particle size of pulverized coal, three hydraulic cylinders 19 are mounted on the base 20 of the equipment. The upper end of each hydraulic cylinder is connected to a pressure frame 12. By adjusting the length of the hydraulic rod 18, the distance between the grinding roller sleeve 34 and the liner 25 is controlled, thereby precisely adjusting the particle size of the pulverized coal. This design gives the equipment flexible particle size adjustment capabilities, enabling it to meet the requirements of different pulverized coal specifications. In addition, the drive motor 8 is connected to the reduction gear 27 and the grinding disc base 30 via a coupling 28, driving the grinding disc, liner, and other components to rotate smoothly, further enhancing the uniformity and efficiency of the coal grinding process. Based on the calibrated position of the hydraulic rod, and in conjunction with a rotary encoder, the current position of the hydraulic rod is guided, determining whether it has reached its limit position, and adjusting the length of the hydraulic rod 18 accordingly.

[0209] The high temperatures generated during coal grinding may affect the stability of the equipment; therefore, the equipment is equipped with a highly efficient cooling and fire suppression system. The transmission pipeline 13 within the equipment consists of a hydraulic coolant inlet pipe 52, a hydraulic coolant outlet pipe 53, and a nitrogen transmission pipe. The hydraulic coolant inlet pipe 52 and outlet pipe 53 are used for the entry and exit of coolant, controlled by a coolant pump control circuit. The nitrogen transmission pipe supplies nitrogen. The hydraulic coolant forms a cooling circuit through the coolant inlet pipe 37 and the grinding roller sleeve 34, providing continuous cooling to the grinding rollers and preventing overheating. Nitrogen from the nitrogen tank 9 enters the device through an independent channel. In the event of a fire, nitrogen can quickly fill the coal grinding area, effectively suppressing combustion and ensuring the safe operation of the equipment.

[0210] The air inlet 7 introduces a flow of cold air, which evenly blows the ground coal powder to the outlet 2, transporting it to the next processing stage. This airflow conveying method not only facilitates the discharge of coal powder but also reduces dust accumulation inside the equipment, optimizing the working environment.

Claims

1. A coal mill overheating monitoring and protection device, comprising a power supply circuit, a touch screen control circuit, an audible and visual alarm circuit, a data control and processing circuit, an Ethernet circuit, a temperature acquisition circuit, a crusher head control circuit, a nitrogen fire extinguishing valve control circuit, a coolant pump control circuit, a three-dimensional attitude sensor communication circuit, a mill disc rotation control circuit, and a hub motor control circuit, characterized in that... The power output port of the power supply circuit is connected to the power ports of the touch screen control circuit, the audible and visual alarm circuit, the data control processing circuit, the Ethernet circuit, the temperature acquisition circuit, the crushing head control circuit, the nitrogen fire extinguishing valve control circuit, the coolant pump control circuit, the three-dimensional attitude sensor communication circuit, the grinding disc rotation control circuit, and the hub motor control circuit, respectively. The signal transmission port of the data control processing circuit is connected to the signal transmission ports of the touch screen control circuit, the audible and visual alarm circuit, the Ethernet circuit, the temperature acquisition circuit, the crushing head control circuit, the nitrogen fire extinguishing valve control circuit, the coolant pump control circuit, the three-dimensional attitude sensor communication circuit, the grinding disc rotation control circuit, and the hub motor control circuit, respectively. The data control processing circuit controls the drive motor for driving the grinding disc assembly to rotate through the grinding disc rotation control circuit; the data control processing circuit controls the hub motor of the hub motor grinding roller module through the hub motor control circuit; and the data control processing circuit controls the crushing and extrusion drive motor of the coal block crushing and extrusion device through the crushing head control circuit. The drive motor that drives the grinding disc assembly to rotate is located at the lower end of the outer shell. The upper end of the outer shell is provided with a coal inlet and a coal outlet, and the lower part of the outer shell is provided with an air inlet. A pressure frame is provided in the upper part of the outer shell. The end of the pressure frame is connected to the upper end of a hydraulic rod. The hydraulic cylinder of the hydraulic rod is located on a base in the lower part of the outer shell. The lower end of the pressure frame is connected to the hub motor grinding roller module and the coal crushing and extrusion device. The grinding disc assembly is located below the pressure frame. The coal crushing and extrusion device includes a crushing and extrusion shell, a first-stage telescopic shell, a second-stage telescopic shell, and a third-stage telescopic shell. A proximity switch for the extrusion device is provided on the outer wall of the crushing and extrusion shell. The first-stage telescopic threaded rotating shaft is connected to the middle of the crushing and extrusion shell through a bearing. The first-stage telescopic threaded rotating shaft is connected to the output shaft of the crushing and extrusion drive motor. The crushing and extrusion shell and the crushing and extrusion drive motor are connected to the pressure frame. The upper middle part of the first-stage telescopic shell is provided with a threaded hole corresponding to the first-stage telescopic threaded rotating shaft. The outer wall of the first-stage telescopic shell is connected to the inner wall of the crushing and extrusion shell through a slider groove structure. The upper middle part of the first-stage telescopic shell has a downwardly extending connecting part, which is connected to the upper end of the second-stage telescopic rotating shaft through a first-stage bearing. The upper end of the second-stage telescopic threaded rotating shaft is fixedly connected to the lower end of the first-stage telescopic threaded rotating shaft. The upper middle part of the secondary telescopic shell is provided with a threaded hole corresponding to the secondary telescopic threaded rotating shaft. The outer wall of the secondary telescopic shell is connected to the inner wall of the primary telescopic shell through a slider groove structure. The upper middle part of the secondary telescopic shell has a downwardly extending connecting part, which is connected to the upper end of the tertiary telescopic rotating shaft through a secondary bearing. The upper end of the tertiary telescopic rotating shaft is fixedly connected to the lower end of the secondary telescopic threaded rotating shaft. The upper end of the three-stage telescopic shell is provided with a threaded hole corresponding to the three-stage telescopic rotation shaft. The lower end of the three-stage telescopic shell is the crushing head. The side wall of the crushing head is provided with a trigger block for the proximity switch of the extrusion device corresponding to the proximity switch of the extrusion device. The outer wall of the three-stage telescopic shell is connected to the inner wall of the two-stage telescopic shell through a slider groove structure.

2. The coal mill overheat monitoring and protection device according to claim 1, characterized in that... The data control and processing circuit uses the EP4CE10F17C8 chip U49. The J2, J1, J6, K6, L6, K2, K1, L2, L1, L3, N2, N1, K5, L4, R1, P2, and P1 ports of U49 are respectively connected to LCD-R0~LCD-R7, LCD-G0~LCD-G7, and LCD-B0. Pins 1, 2, 5, and 6 of the EPCS4SI8N chip U51 are connected to FPGA-nCSO, FPGA-DATA0, FPGA-ASDO, and FPGA-DCLK respectively. U49's D4, E5, F5, B1, C2, C1, F3, D2, D1, G5, F2, F1, G2, G1, and H2 ports are respectively connected to WD-DIN, WD-CLK, WD-CS, WD-DOUT, CLK-PS, FPGA-ASDO, DIN-PS, FPGA-nCSO, PSNetLabel34, PSDJ2-ZCTR, PSDJ2-FCTR, PSPLUSB, PSPLUSA, PSWZFK1, and FPGA-DATA0. The N3, P3, R3, T3, T2, R4, T4, N5, N6, M6, P6, K8, R5, T5, R6, T6, L7, R7, T7, L8, and M8 ports of U49 are respectively connected to RESET, TP-PEN, TP-SCK, TP-MISO, TP-MOSI, TP-CS, LCD-BL, LCD-DE, LCD-VSYNC, LCD-HSYNC, LCD-CLK, LCD-B7~LCD-B1, BJKZ, QMA-SDA, and QMA-SCL ports. U49's N13 and M12 ports are connected to DOUT-PS and CS-PS respectively; The R9, T9, K9, L9, M9, N9, R10, T10, R11, T11, R12, T12, K10, L10, and P9 ports of U49 are respectively connected to MH1, MH2, SBKZ, RTS1, TXD1, RXD1, RTS2, TXD2, RXD2, MPNetLabel34, MPDJ2-ZCTR, MPDJ2-FCTR, MPPLUSA, MPPLUSB, and MPWZFK1. U49's C14, D14, D11, D12, A13, B13, A14, B14, E11, E10, and A12 ports are respectively connected to ETH-TXEN-G, ETH-TXD0-G, ETH-TXD1-G, ETH-RST-G, REFCLK-G, ETH-MDC-G, ETH-MIDO-G, ETH-CRS-DV-G, ETH-RXER-G, ETH-RXD0-G, and ETH-RXD1-G; Ports A8, B8, C8, D8, E8, F8, A7, B7, F6, F7, C6, A6, B6, E7, E6, A2, B5, A4, and B4 of U49 are respectively connected to LGNetLabel34, LGDJ2-ZCTR, LGDJ2-FCTR, LGPLUSA, LGPLUSB, LGWZFK1, CLK-LG, CS-LG, DIN-LG, DOUT-LG, LG1NetLabel34, LG1DJ2-ZCTR, LG1DJ2-FCTR, LG1PLUSA, LG1PLUSB, CLK-LG1, CS-LG1, DIN-LG1, and DOUT-LG1.

3. The coal mill overheat monitoring and protection device according to claim 1, characterized in that... The temperature acquisition circuit includes a B0505S-1WR2 module PM4, a TPS76333 module U24, an ADUM1401ARWZ chip U1, a ZJR1002 module U23, and an AD7794BRUZ chip U21. Pin 2 of PM4 is connected to 5V, pin 4 of PM4 is connected to pins 1 and 3 of U24, and pin 5 of U24 is connected to WDVCC. The two ends of J6 in the JTW-LD-WT302C temperature sensing cable are connected to DL1+ and DL1- respectively; Pins 3-6 and 11-14 of U1 are connected to WD-DIN, WD-CLK, WD-CS, WD-DOUT, WD-DOUT1, WD-CS1, WD-CLK1, and WD-DIN1 respectively. Pin 4 of U23 is connected to WDVCC via ferrite bead L10, and pin 6 of U23 is connected to WD2.

5. DL1+ is connected to CH44+ through inductor L11, and DL1- is connected to CH44- through inductor L12; Pins 1, 3, 17, 18, 23, and 24 of U21 are connected to WD-CLK1, WD-CS1, CH44+, CH44-, WD-DOUT1, and WD-DIN1 respectively.

4. The coal mill overheat monitoring and protection device according to claim 1, characterized in that... The crushing head control circuit includes a URA2415YMD-6WR2 module U50, with pins 1 to 5 of U50 connected to INPUT-, 24IN+, +15V, GND, and -15V respectively. Pins 1 and 2 of the LM358D module U22 are connected to VDIN-PS. Pin 3 of U22 is connected to one end of resistor R112 and one end of resistor R15 through resistor R111. The other end of R15 is connected to PSOUT, and the other end of R112 is connected to GND. Pins 1-3, 9, and 10 of the AD7788ARMZ-REEL chip U26 are connected to CLK-PS, CS-PS, VDIN-PS, DOUT-PS, and DIN-PS respectively. Pin 3 of the HKC-F Hall current sensor J18 is connected to PSOUT; The anode of the input terminal of P521 chip U34 is connected to PSK102-NC. The emitter of the output terminal of U34 is connected to pin 1 of HFD4 / 5 relay K9 and one end of resistor R35. The other end of R35 is connected to PSNetLabel34. Pin 2 of K9 is connected to PSDJ2-ZCTR through resistor R36. Pin 3 of K9 is connected to the anode of the input terminal of P521 chip U35. The cathode of the input terminal of U35 is connected to pin 4 of K9. The collector of the output terminal of U35 is connected to +12VPS. The emitter of the output terminal of U35 is connected to the base of S8050 transistor Q3 through resistor R34. The emitter of Q3 is connected to GNDPS. The collector of Q3 is connected to PSXLA. The controlled switch terminals of relay K8 in HF49FD / 012-1H11 are connected to N-LINE-IN and PSK7NO respectively, and the control terminals of K8 are connected to 12V and PSXLA respectively. The L1, L3, and L5 ports of the CJ20-630A module K101 are connected to A-LINE-IN, B-LINE-IN, and C-LINE-IN respectively. The coil ports of K101 are connected to PSK102-NO and PSK7NO respectively. The first NO port of K101 is connected to PSK101-NC, the second NO port of K101 is connected to 5V, the first NC port of K101 is connected to PSK101-NO, and the second NC port of K101 is connected to B-LINE-IN. The L2, L4, and L6 ports of K101 are connected to pins 3, 2, and 1 of J10 respectively. Pin 1 of the EWN10-24S12H module U38 is connected to INPUT+ via fuse F2 and diode D17 in sequence; pin 2 of U38 is connected to INPUT-; and pin 6 of U38 is connected to +12VPS. Pin 4 of the H11L1 chip U41 is connected to PSPLUSA, and pin 2 of U41 is connected to PSPINPUTA through resistor R51. Pin 4 of the H11L1 chip U40 is connected to PSPLUSB, and pin 2 of U40 is connected to PSINPUTB through resistor R47. Pins 2 and 3 of the rotary encoder J13 are connected to PSINPUTA and PSINPUTB respectively; The anode of the OP1 input terminal of the EL357N chip is connected to +12VPS through resistor R52, the cathode of the OP1 input terminal is connected to PSWZFK11 through diode E9, the collector of the OP1 output terminal is connected to VCC-3.3V, and the emitter of the OP1 output terminal is connected to PSWZFK1. Pin 2 of position detection switch J15 is connected to PSWZFK11.

5. The coal mill overheat monitoring and protection device according to claim 1, characterized in that... The nitrogen fire extinguishing valve control circuit includes P521 chip U3 and P521 chip U5. The anode of the input terminal of U3 is connected to MH1 through resistor R2, the cathode of the input terminal of U3 is connected to GND, the collector of the output terminal of U3 is connected to pin 1 of HF32FA / 012-ZS1 relay K1, pin 2 of K1 is connected to INPUT+, pin 5 of K1 is connected to INPUT+, and pin 4 of K1 is connected to pin 1 of QQP4 / 6 nitrogen tank control port J2. The anode of the U5 input terminal is connected to MH2 through resistor R11, the cathode of the U5 input terminal is connected to GND, the collector of the U5 output terminal is connected to pin 1 of relay K2 of HF32FA / 012-ZS1, pin 2 of K2 is connected to INPUT+, pin 5 of K2 is connected to INPUT-, and pin 3 of K2 is connected to pin 2 of J2.

6. The coal mill overheat monitoring and protection device according to claim 1, characterized in that... The coolant pump control circuit includes an EL357 chip OP6. The anode of the OP6 input terminal is connected to SBKZ through a resistor R6, the cathode of the OP6 input terminal is connected to GND, the collector of the OP6 output terminal is connected to +12V2 through a resistor R5, the emitter of the OP6 output terminal is connected to the base of SS8050 transistor Q5, the emitter of Q5 is connected to GND, and the collector of Q5 is connected to XL1. Pins 3 to 8 of HL2-PS-K relay K5 are connected to AC1-OUT2, AC2-OUT2, AC1-IN, AC2-IN, XL1, and +12V2 respectively; pins 1 and 2 of the coolant pump control port J9 are connected to AC1-OUT2 and AC2-OUT2 respectively.

7. The coal mill overheat monitoring and protection device according to claim 1, characterized in that... The three-dimensional attitude sensor communication circuit includes a B0524S-1WR2 module PM1. Pin 2 of PM1 is connected to 5V. Pin 4 of PM1 is connected to pin 1 of the K7805-1000L module U29 through inductor L8. Pin 3 of U29 is connected to pin 3 of the XC6206P332MR module U10. Pin 2 of U10 is connected to +3.3V. Pins 3 to 5 of the ADUM1301 chip U11 are connected to RTS1, TXD1, and RXD1 respectively. Pins 12 to 14 of U11 are connected to pins 1, 4, and 2 of the VP11 chip U13 respectively. Pin 7 of U13 is connected to pin 1 of the ACT45B-510-2P-TL003 common-mode filter L6 through resistor R68. Pin 2 of L6 is connected to AIOB1, pin 4 of L6 is connected to AIOA1, and pin 6 of U13 is connected to pin 3 of L6 through resistor R73. Pins 2 and 3 of the WT-VB01-485 vibration sensor J5 are connected to AIOB1 and AIOA1 respectively.

8. The coal mill overheat monitoring and protection device according to claim 1, characterized in that... The grinding disc rotation control circuit includes a P521 chip U27. The anode of the input terminal of U27 is connected to MPK102-NC through diode D5. The emitter of the output terminal of U27 is connected to pin 1 of HFD4 / 5 relay K4 and one end of resistor R17. The other end of R17 is connected to MPNetLabel34. Pin 2 of K4 is connected to MPDJ2-ZCTR through resistor R18. Pin 3 of K4 is connected to the anode of the input terminal of P521 chip U31. The cathode of the input terminal of U31 is connected to pin 4 of K4. The collector of the output terminal of U31 is connected to +12VMP. The emitter of the output terminal of U31 is connected to the base of S8050 transistor Q1 through resistor R16. The emitter of Q1 is connected to GNDMP. The collector of Q1 is connected to MPXLA. The controlled switch terminals of relay K3 in HF49FD / 012-1H11 are connected to N-LINE-IN and MPK7NO respectively, and the control terminals of K3 are connected to 12V and MPXLA respectively. The L1, L3, and L5 ports of the CJ20-630A module K103 are connected to A-LINE-IN, B-LINE-IN, and C-LINE-IN respectively. The coil ports of K103 are connected to MPK102-NO and MPK7NO respectively. The first NO port of K103 is connected to MPK103-NC, the second NO port of K103 is connected to 5V, the first NC port of K103 is connected to MPK103-NO, and the second NC port of K103 is connected to B-LINE-IN. The L2, L4, and L6 ports of K103 are connected to pins 3, 2, and 1 of J3 respectively. Pin 1 of the EWN10-24S12H module U39 is connected to INPUT+ via fuse F3 and diode D18 in sequence; pin 2 of U39 is connected to INPUT-; and pin 6 of U39 is connected to +12VMP. Pin 4 of the H11L1 chip U20 is connected to MPPLUSA, and pin 2 of U20 is connected to MPINPUTA through resistor R106. Pin 4 of the H11L1 chip U25 is connected to MPPLUSB, and pin 2 of U25 is connected to MPINPUTB through resistor R109. Pins 2 and 3 of the rotary encoder J16 are connected to MPINPUTA and MPINPUTB respectively. The anode of the OP19 input terminal of the EL357N(B)(TA)-G chip is connected to +12VMP through resistor R110, the cathode of the OP19 input terminal is connected to MPWZFK11 through diode E3, the collector of the OP19 output terminal is connected to VCC-3.3V, and the emitter of the OP19 output terminal is connected to MPWZFK1. Pin 2 of position detection switch J17 is connected to MPWZFK11.

9. The coal mill overheat monitoring and protection device according to claim 1, characterized in that... The hub motor control circuit includes an LM358D module U16. Pins 1 and 2 of U16 are connected to VDIN-LG. Pin 3 of U16 is connected to one end of resistor R26 and one end of resistor R28 through resistor R27. The other end of R26 is connected to LGOUT, and the other end of R28 is connected to GND. Pins 1-3, 9, and 10 of the AD7788ARMZ-REEL chip U15 are connected to CLK-LG, CS-LG, VDIN-LG, DOUT-LG, and DIN-LG respectively. Pin 3 of the HKC-F Hall current sensor J19 is connected to LGOUT; The anode of the input terminal of P521 chip U42 is connected to LGK102-NC. The emitter of the output terminal of U42 is connected to pin 1 of HFD4 / 5 relay K14 and one end of resistor R30. The other end of R30 is connected to LGNetLabel34. Pin 2 of K14 is connected to LGDJ2-ZCTR through resistor R31. Pin 3 of K14 is connected to the anode of the input terminal of P521 chip U43. The cathode of the input terminal of U43 is connected to pin 4 of K14. The collector of the output terminal of U43 is connected to +12VLG. The emitter of the output terminal of U43 is connected to the base of S8050 transistor Q7 through resistor R29. The emitter of Q7 is connected to GNDLG. The collector of Q7 is connected to LGXLA. The controlled switch terminals of relay K13 in HF49FD / 012-1H11 are connected to N-LINE-IN and LGK7NO respectively, and the control terminals of K13 are connected to 12V and LGXLA respectively. The L1, L3, and L5 ports of the CJ20-630A module K107 are connected to A-LINE-IN, B-LINE-IN, and C-LINE-IN respectively. The coil ports of K101 are connected to LGK102-NO and LGK7NO respectively. The first NO port of K101 is connected to LGK101-NC, the second NO port of K101 is connected to 5V, the first NC port of K101 is connected to LGK101-NO, and the second NC port of K101 is connected to B-LINE-IN. The L2, L4, and L6 ports of K101 are connected to pins 3, 2, and 1 of the J20 module respectively. Pin 1 of the EWN10-24S12H module U46 is connected to INPUT+ via fuse F4 and diode D23 in sequence; pin 2 of U46 is connected to INPUT-; and pin 6 of U46 is connected to +12VLG. Pin 4 of the H11L1 chip U48 is connected to LGPLUSA, and pin 2 of U48 is connected to LGINPUTA through resistor R64. Pin 4 of the H11L1 chip U47 is connected to LGPLUSB, and pin 2 of U47 is connected to LGINPUTB through resistor R62. Pins 2 and 3 of the rotary encoder J22 are connected to LGINPUTA and LGINPUTB respectively.

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