Coal mill structure capable of improving efficiency

Abstract

The invention belongs to the technical field of coal mills, and particularly relates to a coal mill structure capable of improving efficiency. The invention provides a coal mill structure capable of improving efficiency. The device comprises a shell, the upper end of the shell is provided with a coal inlet 1 and a coal outlet 2, the lower part of the shell is provided with an air inlet 7, and the lower end of the shell is provided with a driving motor 8 for driving a millstone assembly 49 to rotate; the device is characterized in that a pressing frame 12 is arranged on the upper portion in the shell, the end of the pressing frame 12 is connected with the upper end of a hydraulic rod 18, and a hydraulic cylinder 19 of the hydraulic rod 18 is arranged on a base 20 on the lower portion in the shell; the lower end of the pressing frame 12 is connected with a hub motor grinding roller module 24 and a coal briquette crushing and extruding device 23, and a millstone assembly 49 is arranged below the pressing frame 12.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mills, and in particular relates to a coal mill structure with improved efficiency. Background Art

[0002] Coal mill is a machine that crushes coal blocks and grinds them into coal powder. It is an important auxiliary equipment for pulverized coal furnace. Existing coal mills usually adopt drum or roller disc structure, without crushing head, temperature detection and fire extinguishing device, raw coal block volume detection and special treatment of large raw coal blocks. Large raw coal blocks will get stuck in the roller. Therefore, the existing coal mill structure still has room for improvement in automation, intelligent monitoring, cooling system, safety protection and improving coal grinding efficiency (crushing and grinding). Summary of the invention

[0003] The present invention is aimed at the above-mentioned problem and provides a coal mill structure capable of improving efficiency.

[0004] To achieve the above object, the present invention adopts the following technical solution, which comprises a housing, a coal inlet 1 and a coal outlet 2 are arranged at the upper end of the housing, an air inlet 7 is arranged at the lower part of the housing, and a driving motor 8 for driving the grinding disc assembly 49 to rotate is arranged at the lower end of the housing;

[0005] It is characterized in that a press frame 12 is arranged at the upper part of the shell, the end of the press frame 12 is connected to the upper end of the hydraulic rod 18, and the hydraulic cylinder 19 of the hydraulic rod 18 is arranged on the base 20 at the lower part of the shell; the lower end of the press frame 12 is connected to the hub motor grinding roller module 24 and the coal block crushing and extrusion device 23, and a grinding disc assembly 49 is arranged below the press frame 12.

[0006] As a preferred solution, the top end of the top shell 4 of the present invention is provided with a top support plate 3, and the coal inlet 1 and the coal outlet 2 are arranged on the top support plate 3. The top support plate 3 and the top shell 4 provide stable support and protection for the equipment to prevent interference with the equipment by the external environment.

[0007] As another preferred embodiment, an inverted truncated cone-shaped cylinder 61 is provided in the middle of the top shell 4 of the present invention, and the upper end of the inverted truncated cone-shaped cylinder 61 is connected to the top support plate 3 through the top support plate connecting bolt 62; a plurality of strip openings 63 are evenly distributed along the circumferential direction on the lower side wall of the inverted truncated cone-shaped cylinder 61. The airflow carrying the coal powder enters the coal outlet 2 from the lower end opening of the inverted truncated cone-shaped cylinder 61 and the strip opening 63 at the same time, thereby improving the air circulation rate. The strip opening 63 helps the airflow to flow out evenly from the outlet, rather than concentrating in certain areas; it is conducive to uniform air outlet. The strip opening 63 can effectively adjust the direction of the airflow, so that the airflow is more evenly distributed in the outlet area.

[0008] As another preferred embodiment, a cyclone separator 69 is arranged below the inverted truncated cone-shaped cylinder 61 in the housing of the present invention, and the upper outlet of the cyclone separator 69 is connected to the inlet of the inverted truncated cone-shaped cylinder 61. Wind carries coal powder into the cyclone separator from the upper inlet 70, and coal powder that meets the size is discharged from the upper outlet of the cyclone separator 69, and coal powder that does not meet the size (larger particles) falls back to the grinding disc assembly 49 from the slag discharge port 71 at the lower end of the cyclone separator for further grinding.

[0009] As another preferred solution, the present invention has two coal outlets 2, which are respectively arranged on both sides of the coal inlet 1. The two coal outlets 2 are arranged on both sides of the coal inlet 1 to increase the coal outlet efficiency.

[0010] As another preferred embodiment, the air inlet pipe at the air inlet 7 of the present invention is arranged to be inclined from the inner bottom to the outer top.

[0011] As another preferred solution, the press frame 12 of the present invention is triangular, the combination of the hydraulic rod 18 and the hydraulic cylinder 19 is three groups, there is one coal block crushing and squeezing device 23, and there are two hub motor grinding roller modules 24; the lower ends of two sides of the triangular press frame 12 are each connected to a hub motor grinding roller module 24, and the lower end of the other side of the triangular press frame 12 is connected to the coal block crushing and squeezing device 23. The press frame 12 is designed as a triangular structure, which is convenient for installing the hub motor grinding roller module 24, evenly distributing gravity, and facilitating the arrangement of the hydraulic rod 18.

[0012] As another preferred embodiment, the hub motor grinding roller module 24 of the present invention includes a U-shaped grinding roller frame 33, and hinges 32 are arranged on 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 through 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 on the inner side of the front end of the grinding roller motor shell 41, and is connected to the front end of the grinding roller motor shell 41 through a front ball bearing 44; the rear end of the grinding roller motor shell 41 is connected to the grinding roller motor rear cover plate 45 through fasteners; the middle part of the grinding roller motor shaft 31 passes through the middle part of the grinding roller motor rear cover plate 45, and is connected to the grinding roller motor rear cover plate 45 through a rear ball bearing 46; a grinding roller sleeve 34 is arranged on the periphery of the grinding roller motor shell 41. The lower end of the hinged member 32 is hinged to the upper end of the grinding roller frame 33, and the grinding roller sleeve 34 can change the movement direction during operation and adapt to the size of the coal block to perform grinding work.

[0013] As another preferred embodiment, the grinding roller sleeve 34 of the present invention is provided with an annular coolant groove 51 at the front end, and a grinding roller front cover plate 35 is provided at the front end of the coolant groove 51. A sealing gasket 40 is provided between the grinding roller front cover plate 35 and the end surface 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 supply 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.

[0014] The structure of the stator, winding and rotor arranged in the grinding roller motor shell 41 is a conventional structure of the existing hub motor. The present invention makes the grinding roller sleeve 34 into a hollow structure (i.e., an annular coolant groove 51) on the basis of the existing hub motor for the flow of coolant. The grinding roller motor shaft 31 is equivalent to the rotating shaft of the hub motor. The grinding roller motor shaft 31 is fixedly connected to the grinding roller frame 33. The grinding roller motor shaft 31 does not rotate, and the grinding roller motor shell 41 rotates around the grinding roller motor shaft 31, driving the grinding roller sleeve 34 to rotate. When the grinding roller sleeve 34 has been used for a long time, it can be replaced with a new one. The grinding roller sleeve 34 can be made of alloy steel or cast iron. Figure 7 As shown, when the grinding roller sleeve 34 needs to be replaced, the grinding roller motor rear cover 45 is separated from the grinding roller motor shell 41, the grinding roller sleeve 34 is removed, and a new grinding roller sleeve 34 is replaced, and then the grinding roller motor rear cover 45 is connected to the grinding roller motor shell 41.

[0015] As another preferred embodiment, the other end of the coolant inlet pipe 37 and the other end of the coolant return pipe 36 of the present invention are both connected to a universal joint 39 .

[0016] As another preferred embodiment, the upper end of the press frame 12 of the present invention is provided with a transmission pipeline 13, which includes a hydraulic coolant input pipe 52, a hydraulic coolant output pipe 53 and a nitrogen transmission pipe 64. One end of the hydraulic coolant input pipe 52 is connected to the coolant source pipe 37 through a universal joint, one end of the hydraulic coolant output pipe 53 is connected to the coolant return pipe 36 through a universal joint, the other end of the hydraulic coolant input pipe 52 is connected to the oil outlet of the coolant tank 10, and the other end of the hydraulic coolant output 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 branch pipe 64 faces the grinding disc assembly 49. The part of the transmission pipeline 13 passing through the press frame 12 can be arranged inside the press frame 12.

[0017] As another preferred embodiment, the shell of the present invention includes a top shell 4, a middle shell 5, a lower shell 6 and a bottom casing 11, the lower shell 6 is provided with an inspection port 48, the nitrogen tank 9 and the coolant tank 10 are arranged at the inspection port 48, and the air inlet 7 is arranged below the inspection port 48.

[0018] As a preferred solution, the top shell 4 and the middle shell 5 of the present invention are connected by an upper flange 65 and bolts, and the middle shell 5 and the lower shell 6 are connected by a lower flange 66 and bolts; the top shell 4 is an arc-shaped structure, and the middle shell 5 is an inverted frustum-shaped structure, and the size of the lower end of the top shell 4 corresponds to the size of the upper end of the middle shell 5.

[0019] The coal mill is a large-scale equipment. The outer shell is divided into four parts for easy processing and installation. The four parts can be connected with high-strength bolts. The top support plate 3 is used to support the coal inlet 1 and the coal outlet 2. The top outer shell 4 is the largest, so that the internal space will increase. Under the action of the Bernoulli principle, the wind speed at the coal outlet 2 will increase the coal output efficiency. The middle outer shell 5 and the lower outer shell 6 are set to better transition. At the same time, the middle outer shell 5 and the lower outer shell 6 protect the internal structure of the coal mill and enhance the overall structural strength of the equipment. The bottom casing 11 provides bottom support for the equipment, and the base 20 and the hydraulic cylinder 19 are installed to ensure the stable operation of the equipment.

[0020] As a preferred solution, the inspection opening 48 of the present invention is a four-frame structure, and the nitrogen tank 9 and the coolant tank 10 are arranged in the four-frame structure.

[0021] The four-frame structure is used to store the nitrogen tank 9 and the coolant tank 10. At the same time, the inspection port 48 can be used for daily manual monitoring of the equipment. A small door that can be opened and closed is set on the lower shell 6 at the inspection port 48. The nitrogen tank 9 and the coolant tank 10 are installed close to the pressure frame 12, with a short transmission distance, which increases the efficiency of cooling and fire extinguishing.

[0022] As another preferred solution, the grinding roller frame 33 of the present invention is provided with a three-dimensional posture sensor module 15. The three-dimensional posture sensor module 15 is provided to monitor the angle change of the hub motor grinding roller module 24 and detect the size of the coal block.

[0023] As another preferred embodiment, the grinding disc assembly of the present invention includes a grinding disc base 30, a rotating body 26 is in the middle of the grinding disc base 30, a conical protrusion 57 is provided in the middle of the upper end of the rotating body 26, an annular liner 25 is arranged at the upper end of the rotating body 26 around the center of the rotating body 26, and the outer periphery of the upper end surface of the liner 25 is an arc surface that transitions from the inner bottom to the outer top. The rotating body 26 and the grinding disc base 30 can be connected by interference fit, the shaft end is axially fixed, and the rotating body 26 and the grinding disc base 30 rotate together.

[0024] The liner 25 is used to protect the grinding disc structure and provide wear resistance to extend the service life of the equipment. The liner 25 can be connected to the grinding disc base 30 through fasteners. If the liner 25 is damaged after long-term use, the liner 25 can be separated from the grinding disc base 30 and replaced with a new liner 25. By adjusting the length of the hydraulic rod 18, the distance between the grinding roller sleeve 34 and the liner 25 is controlled to improve the rolling effect and efficiency.

[0025] As another preferred solution, the upper periphery of the rotating body 26 of the present invention is provided with an annular blowing plate 22, the upper end surface of the blowing plate 22 is an arc surface that transitions from the inner bottom to the outer top, and the upper end surface of the blowing plate 22 is provided with a blowing port 42, the blowing direction of the blowing port 42 is upward; the air inlet of the blowing plate 22 is connected with the air inlet 7; the coal inlet 1 is provided at the upper end of the coal inlet pipe 60; the lower end of the coal inlet pipe 60 is placed below the press frame 12, facing the center of the grinding disc assembly 49. The blowing port 42 can be connected with the vertical channel inside the blowing plate 22, and each vertical channel is connected with the transverse channel, and the transverse channel is connected to the air inlet 7.

[0026] As another preferred solution, the blowing plate 22 of the present invention is evenly distributed with two inner and outer circles of blowing holes 42. The small-diameter multiple holes are set to prevent the coal blocks from falling, increase the blowing area, and increase the blowing efficiency.

[0027] As another preferred solution, the outer end of the blowing plate 22 of the present invention is fixedly connected to the inner wall of the lower shell 6. During the operation of the equipment, the blowing plate 22 does not rotate, and the lining plate 25 rotates with the rotating body 26.

[0028] Cold air is introduced through the air inlet 7, which is used to supply air to the blowing plate 22. The air flows upward along the blowing port 42 to blow up the ground coal powder.

[0029] Under the combined effect of centrifugal force (the rotation of the rotating body 26 generates centrifugal force) and continuous coal feeding from the coal inlet pipe 60, the raw coal spreads from the center of the grinding disc assembly 49 to the surrounding area, and the blowing plate 22 blows the coal powder upward. The wind blown upward by the blowing plate 22 carries the coal powder out from the coal outlet 2. Figure 2 As shown, arrows indicate the flow path of wind.

[0030] An air guide channel is provided inside the blowing plate 22, and the air guide channel connects the blowing ports.

[0031] The blowing plate 22 is used to optimize the air flow distribution so that the cold air is blown evenly toward the coal powder particles, helping the coal powder to be discharged from the equipment more efficiently.

[0032] As another preferred solution, the inner upper end of the lining plate 25 of the present invention is a plane, and an annular temperature sensing cable cover plate placement groove is arranged around the center of the rotating body 26 on the plane, and a spiral temperature sensing cable placement groove is arranged around the center of the rotating body 26 on the bottom surface of the temperature sensing cable cover plate placement groove, and a temperature sensing cable 16 is arranged in the temperature sensing cable placement groove, and a temperature sensing cable cover plate 17 is arranged in the temperature sensing cable cover plate placement groove. The temperature sensing cable cover plate 17 can be connected to the lining plate 25 by screws 67. The temperature sensing cable 16 is arranged to monitor the temperature change in the coal mill in real time, and in an emergency, the fire is extinguished through the nitrogen tank 9 and the nitrogen pipe 64.

[0033] As another preferred embodiment, the blowing plate 22 of the present invention is arranged on the periphery of the lining plate 25, and the upper end of the lining plate 25 is lower than the upper end of the blowing plate 22. The upper end of the lining plate 25 is lower than the upper end of the blowing plate 22, ensuring that the coal powder is fully blown.

[0034] As another preferred embodiment, the grinding wheel base 30 of the present invention is arranged at the upper end of the reducer housing 21, and the lower part of the grinding wheel base 30 is connected to the reducer housing 21 through a bearing; the middle part of the lower end 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 in the reducer housing 21 through a bearing.

[0035] As another preferred embodiment, the coal block crushing and extruding device 23 of the present invention comprises a crushing and extruding 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, and an extruding device proximity switch 47 is arranged on the outer wall of the crushing and extruding shell 23-1; the middle part of the crushing and extruding 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 extruding driving motor, and the crushing and extruding shell and the crushing and extruding driving motor are connected to the pressing frame 12;

[0036] A threaded hole is provided in the middle of the upper end of the primary telescopic shell 23-5 corresponding to the primary telescopic threaded rotating shaft 23-2. The outer wall of the primary telescopic shell 23-5 is connected to the inner wall of the crushing and extruding shell 23-1 through a slider slot structure. The middle of the upper end of the primary telescopic shell 23-5 has a connecting portion extending downward, which is connected to the upper end of the secondary telescopic rotating shaft 23-3 through a primary bearing 23-8. The upper end of the secondary telescopic threaded rotating shaft 23-3 is fixedly connected to the lower end of the primary telescopic threaded rotating shaft 23-2.

[0037] A threaded hole is provided in the middle of the upper end of the secondary telescopic shell 23-6 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 slot structure. The middle of the upper end of the secondary telescopic shell 23-6 has a connecting portion extending downward, which is connected to the upper end of the tertiary telescopic rotating shaft 23-4 through a 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.

[0038] 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 a crushing head 43, and the side wall of the crushing head 43 is provided with a trigger block 68 of 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 slot structure. The trigger block 68 of the extrusion device proximity switch can adopt a set screw.

[0039] The slider and slot structure restricts the telescopic shell to move vertically but not to rotate. For example, a slider is arranged outside the primary telescopic shell 23-5, and a strip-shaped slot is arranged on the inner wall of the crushing and extruding shell 23-1. The slider slides in the strip-shaped slot, and the strip-shaped slot is arranged along the length direction of the crushing and extruding 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. The telescopic shell can only move vertically to realize the lifting and lowering of the crushing head 43 and complete the crushing of large coal blocks.

[0040] The extrusion device proximity switch 47 cooperates with the trigger block 68 of the extrusion device proximity switch to detect the position of the crushing head 43.

[0041] Secondly, the blowing plate 22 of the present invention is provided with a grinding disc proximity switch 59, and the outer end of the lining plate 25 is provided with a triggering protrusion 58 of the grinding disc proximity switch 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.

[0042] The squeezing device proximity switch 47 and the grinding disc proximity switch 59 are provided to accurately control the crushing of large coal lumps by the coal mill and improve the working efficiency of the coal mill.

[0043] In addition, the outer side of the coal block crushing and extruding device 23 of the present invention is provided with a mounting plate 54 for the extruding device proximity switch 47 , and the outer side of the blowing plate 22 is provided with a mounting groove 55 for the grinding disc proximity switch 59 .

[0044] The temperature sensing cable 16 external wiring, the proximity switch external wiring, and the signal transmission of the three-dimensional posture sensor module 15 can be transmitted via Bluetooth or cable. For example, the wiring of the three-dimensional posture sensor module 15 can be routed through the wiring channel on the grinding roller frame 33, the pressure frame 12, and the inspection port 48.

[0045] The invention has beneficial effects.

[0046] The present invention firstly crushes the large raw coal by the coal crushing and squeezing device 23, and then crushes it by the hub motor grinding roller module 24, thereby improving the grinding efficiency, reducing the occurrence of blocking, and improving the overall working efficiency and reliability of the equipment.

[0047] The present invention controls the distance between the hub motor grinding roller module 24 and the grinding disc assembly 49 by adjusting the length of the hydraulic rod 18, thereby improving the rolling effect and efficiency.

[0048] The coal inlet 1 of the present invention is used for feeding raw coal. The raw coal enters the coal grinding area inside the equipment through the channel and starts the crushing and grinding process.

[0049] The driving motor 8 of the present invention is the main power source of the equipment, driving the grinding disc assembly 49 to rotate.

[0050] The air inlet 7 of the present invention allows air to enter, and the processed coal powder is blown out from the coal outlet 2. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is an appearance diagram of the present invention.

[0052] Figure 2 It is a cross-sectional view of the present invention.

[0053] Figure 3 It is a schematic diagram of the internal structure of the present invention.

[0054] Figure 4 It is a cross-sectional view of the grinding disc transmission part of the present invention.

[0055] Figure 5 for Figure 4 Enlarged view of part A.

[0056] Figure 6 It is a schematic diagram of the hub motor grinding roller module of the present invention.

[0057] Figure 7 This is a cross-sectional view of the hub motor grinding roller of the present invention.

[0058] Figure 8 It is a schematic diagram of the transmission pipeline of the present invention.

[0059] Fig. 9 This is a diagram showing the arrangement of the proximity switch and three-dimensional posture sensor module of the present invention.

[0060] Fig.10 It is the front view of the lining plate of the present invention.

[0061] Fig.11 This is a diagram of the coal block crushing and extrusion device of the present invention in an extended state.

[0062] Fig.12 This is a diagram of the coal block crushing and extrusion device in the present invention in a contracted state.

[0063] Figures 1 to 12 The names of the components are:

[0064] Coal inlet 1, coal outlet 2, top support plate 3, top shell 4, middle shell 5, lower shell 6, air inlet 7, drive motor 8, nitrogen tank 9, coolant tank 10, bottom casing 11, press frame 12, transmission pipeline 13, beam collector 14, three-dimensional posture sensor module 15, temperature sensing cable 16, temperature sensing cable cover 17, hydraulic rod 18, hydraulic cylinder 19, base 20, reducer housing 21, blowing plate 22, coal block crushing and extrusion device 23, hub motor grinding roller module 24, lining plate 25, rotating body 26, reduction gear set 27, coupling 28, motor shaft 29, grinding disc base 30, grinding roller shaft 31, hinge 32, grinding roller frame 33, grinding roller sleeve 34, grinding roller front cover 35, coolant circuit pipe 36, coolant inlet pipe 37, grinding roller motor cover 38, universal joint 39, seal Sealing gasket 40, grinding roller motor housing 41, blowing port 42, crushing head 43, front ball bearing 44, grinding roller motor rear cover plate 45, rear ball bearing 46, extrusion device proximity switch 47, inspection port 48, grinding disc assembly 49, vertical transmission shaft 50, coolant tank 51, hydraulic coolant inlet pipe 52, hydraulic coolant outlet pipe 53, mounting plate 54, mounting slot 55, coolant pump 56, conical protrusion 57, triggering protrusion 58 of grinding disc proximity switch, grinding disc proximity switch 59, coal inlet pipe 60, inverted truncated cone-shaped cylinder 61, top support plate connecting bolts 62, strip opening 63, nitrogen transmission pipe 64, upper flange 65, lower flange 66, screw 67, triggering block 68 of extrusion device proximity switch, cyclone separator 69, upper inlet 70 of cyclone separator, slag discharge port 71 at the lower end of cyclone separator.

[0065] Fig.13 It is a schematic diagram of the power supply circuit of the present invention.

[0066] Fig.14 It is a schematic diagram of the touch screen control circuit of the present invention.

[0067] Fig.15 The utility model is a circuit principle diagram of the sound and light alarm of the present invention.

[0068] Fig.16 , 17 It is a schematic diagram of the data control processing circuit of the present invention.

[0069] Fig.18 It is the Ethernet circuit principle diagram of the present invention.

[0070] Fig.19 It is the principle diagram of the temperature acquisition circuit of the present invention.

[0071] Fig. 20 , 21 It is a schematic diagram of the crushing head control circuit of the present invention.

[0072] Fig. 22 The figure is a schematic diagram of a nitrogen fire extinguishing valve control circuit of the present invention.

[0073] Fig.23 It is a schematic diagram of the coolant pump control circuit of the present invention.

[0074] Fig.24 , 25 It is a schematic diagram of the communication circuit of the three-dimensional posture sensor of the present invention.

[0075] Fig.26 , 27 It is the principle diagram of the grinding disc rotation control circuit of the present invention.

[0076] Fig.28 , 29 It is a schematic diagram of the hub motor control circuit of the present invention. DETAILED DESCRIPTION

[0077] The control circuit used in conjunction with the mechanical part of the present invention includes 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 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 output port of the power supply circuit is respectively connected to the power port of the touch screen control circuit, the power port of the audible and visual alarm circuit, the power port of the data control processing circuit, the power port of the Ethernet circuit, the power port of the temperature acquisition circuit, the power port of the crushing head control circuit, the power port of the nitrogen fire extinguishing valve control circuit, and the coolant pump control circuit. The power port of the circuit, the power port of the three-dimensional posture sensor communication circuit, the power port of the grinding disc rotation control circuit, and the power port of the wheel hub motor control circuit are connected; the signal transmission port of the data control processing circuit is respectively connected with the signal transmission port of the touch screen control circuit, the signal transmission port of the sound and light alarm circuit, the signal transmission port of the Ethernet circuit, the signal transmission port of the temperature acquisition circuit, the signal transmission port of the crushing head control circuit, the signal transmission port of the nitrogen fire extinguishing valve control circuit, the signal transmission port of the coolant pump control circuit, the signal transmission port of the three-dimensional posture sensor communication circuit, the signal transmission port of the grinding disc rotation control circuit, and the signal transmission port of the wheel hub motor control circuit.

[0078] The Ethernet circuit is used to transmit the motor operating status, detection temperature, alarm and other information to the monitoring center.

[0079] The power supply circuit includes an EWN10-24S12H module U4, an LM2576-5.0 module U2, a TPS62040DGQ module U6, a TPS62040DGQ module U7, an AMS1117-2.5 module U8 and an 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 an inductor L1, and pin 4 of U2 is connected to 5V;

[0080] Pins 1, 2, and 3 of U6 are connected to 5V, and pins 7 and 8 of U6 are connected to VCC-1.2V and one end of resistor R8 through inductor L4. The other end of R8 is connected to pin 5 of U6 and one end of resistor R12, and the other end of resistor R12 is connected to GND.

[0081] Pins 2 and 3 of U7 are connected to 5V, and 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, and the other end of resistor R13 is connected to GND.

[0082] Pin 3 of U8 is connected to 5V, and pins 2 and 4 of U8 are connected to VCC-2.5V;

[0083] Pin 3 of U9 is connected to AVCC-3.3, and pins 2 and 4 of U9 are connected to VCC-1.8.

[0084] The touch screen control circuit adopts ATK-MD0700R module J4, and pins 3 to 10, 12 to 19, 21 to 28, and 30 to 40 of J4 are respectively connected to LCD-R0 to LCD-R7, LCD-G0 to LCD-G7, LCD-B0 to LCD-B7, LCD-CLK, LCD-HSYNC, LCD-VSYNC, LCD-DE, LCD-BL, TP-CS, TP-MOSI, TP-MISO, TP-SCK, TP-PEN, and RESET.

[0085] The sound and light alarm circuit includes an EL357 chip OP14, an SS8050 tube Q6, an HL2-PS-K relay K10 and an LTE-1101J alarm J14, the anode of the OP14 input terminal is connected to BJKZ through a resistor R67, the cathode of the OP14 input terminal is connected to GND, the collector of the OP14 output terminal is connected to +12V2 through a resistor R66, the emitter of the OP14 output terminal is connected to the base of Q6, the emitter of Q6 is connected to GND, and the collector of Q6 is connected to XL1;

[0086] 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.

[0087] The alarm J14 can be set at a position that is convenient for relevant personnel to observe. The alarm J14 alarms possible fire situations.

[0088] The data control processing circuit adopts EP4CE10F17C8 chip U49, and 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;

[0089] Pins 1, 2, 5, and 6 of the EPCS4SI8N chip U51 are connected to FPGA-nCSO, FPGA-DATA0, FPGA-ASDO, and FPGA-DCLK respectively;

[0090] The D4, E5, F5, B1, C2, C1, F3, D2, D1, G5, F2, F1, G2, G1, and H2 ports of U49 are 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 respectively;

[0091] The N3, P3, R3, T3, T2, R4, T4, N5, N6, M6, P6, K8, R5, T5, R6, T6, L7, R7, T7, L8, 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;

[0092] The N13 and M12 ports of U49 are connected to DOUT-PS and CS-PS respectively;

[0093] The R9, T9, K9, L9, M9, N9, R10, T10, R11, T11, R12, T12, K10, L10, and P9 ports of U49 are connected to MH1, MH2, SBKZ, RTS1, TXD1, RXD1, RTS2, TXD2, RXD2, MPNetLabel34, MPDJ2-ZCTR, MPDJ2-FCTR, MPPLUSA, MPPLUSB, and MPWZFK1 respectively;

[0094] The C14, D14, D11, D12, A13, B13, A14, B14, E11, E10, and A12 ports of U49 are 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 respectively;

[0095] The A8, B8, C8, D8, E8, F8, A7, B7, F6, F7, C6, A6, B6, E7, E6, A2, B5, A4, and B4 ports 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.

[0096] U51 is used to store FPGA source program.

[0097] The Ethernet circuit includes a HR871155A chip T1 and a LAN8742 chip U14. The 3 pins of T1 are connected to TX-PG and one end of a resistor R75 respectively. The other end of R75 is connected to VCC-3.3V,

[0098] One end of resistor R79, one end of resistor R80, one end of resistor R78, and one end of capacitor C170 are connected, 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;

[0099] The other end of R79 is connected to RX-PG and pin 5 of T1 respectively, and the other end of R80 is connected to RX-NG and pin 8 of T1 respectively;

[0100] Pin 11 of T1 is connected to LEDA-G through resistor R82; Pin 14 of T1 is connected to LEDB-G through resistor R83;

[0101] Pins 12, 13, and 1 of T1 are connected to GND, and pins 15, 16, and 10 of T1 are connected to the ground (the ground is the shell grounding to filter out external interference);

[0102] Pins 20 to 23 of U14 are connected to TX-NG, TXP-G, RX-NG, and RX-PG respectively;

[0103] Pins 2 and 3 of U14 are connected to LEDB-G and LEDA-G respectively;

[0104] 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, and 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.

[0105] U49 communicates with Ethernet through LAN8720A chip U14 and HR871155A connector T1 to transmit information.

[0106] 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, the 2nd pin of PM4 is connected to 5V, the 4th pin of PM4 is connected to the 1st and 3rd pins of U24, and the 5th pin of U24 is connected to WDVCC;

[0107] JTW-LD-WT302C temperature sensing cable J6( Fig.19 J6 in Figure 5 The two ends of the DL1+ and DL1- are connected to each other respectively;

[0108] Pins 3 to 6 and 11 to 14 of U1 are connected to WD-DIN, WD-CLK, WD-CS, WD-DOUT, WD-DOUT1, WD-CS1, WD-CLK1, and WD-DIN1 respectively;

[0109] Pin 4 of U23 is connected to WDVCC through magnetic bead L10, and pin 6 of U23 is connected to WD2.5;

[0110] DL1+ is connected to CH44+ through inductor L11, and DL1- is connected to CH44- through inductor L12;

[0111] 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.

[0112] The temperature detection uses JTW-LD-WT302C temperature sensing cable, which can cover and measure a large area of ​​the lining board 25, detect the highest temperature at the covered position, and report the highest temperature.

[0113] Temperature sensing cables are similar to thermistors and can detect temperature over a large area. Fig.10 As shown, the temperature sensing cable 16 is coiled in the temperature sensing cable placement groove on the lining plate 25.

[0114] 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.

[0115] The resistance change value of the temperature sensing cable is connected to the circuit through J6. WD2.5 is the power supply. The power supply is filtered by the inductor L11 through the resistor voltage divider to remove the high-frequency part, and then divided by DL1+ and DL1-, and then by L12 and R49 to WDGND, where the differential signal can be obtained at the CH44+ and CH44- positions; that is, when the external temperature changes, the resistance value of the temperature sensing cable 16 changes, and the temperature sensing cable 16 and the power supply resistor and the temperature sensing cable 16 are connected in series to divide the voltage to obtain an equivalent differential voltage. The differential power supply is connected to the U21 differential analog-to-digital conversion chip, and after conversion, the converted digital signal is transmitted to U1 for processing and then sent to U49. U1 is used for signal isolation. The original secondary side (the left and right sides in the circuit) can be regarded as a normal circuit connection. In fact, the interior is isolated, with a voltage isolation effect of hundreds of volts.

[0116] The crushing head control circuit includes a URA2415YMD-6WR2 module U50, and pins 1 to 5 of U50 are respectively connected to INPUT-, 24IN+, +15V, GND, and -15V;

[0117] Pins 1 and 2 of LM358D module U22 are connected to VDIN-PS, and 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.

[0118] The 1~3, 9, and 10 pins of the AD7788ARMZ-REEL chip U26 are connected to CLK-PS, CS-PS, VDIN-PS, DOUT-PS, and DIN-PS respectively;

[0119] HKC-F Hall current sensor J18's 3rd pin is connected to PSOUT;

[0120] The anode of the input terminal of the P521 chip U34 is connected to PSK102-NC, and the emitter of the output terminal of U34 is connected to the 1st pin of the HFD4 / 5 relay K9 and one end of the resistor R35 respectively, and the other end of R35 is connected to PSNetLabel34; the 2nd pin of K9 is connected to PSDJ2-ZCTR through the resistor R36, the 3rd pin of K9 is connected to the anode of the input terminal of the P521 chip U35, and the cathode of the input terminal of U35 is connected to the 4th pin of K9; the collector of the output terminal of U35 is connected to +12VPS, and the emitter of the output terminal of U35 is connected to the base of the S8050 tube Q3 through the resistor R34, the emitter of Q3 is connected to GNDPS, and the collector of Q3 is connected to PSXLA;

[0121] The two ends of the controlled switch of HF49FD / 012-1H11 relay K8 are connected to N-LINE-IN and PSK7NO respectively, and the two ends of the control end of K8 are connected to 12V and PSXLA respectively;

[0122] 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 the 3rd, 2nd, and 1st pins of J10 respectively;

[0123] The 1st pin of the EWN10-24S12H module U38 is connected to INPUT+ through fuse F2 and diode D17, the 2nd pin of U38 is connected to INPUT-, and the 6th pin of U38 is connected to +12VPS;

[0124] Pin 4 of H11L1 chip U41 is connected to PSPLUSA, and pin 2 of U41 is connected to PSINPUTA through resistor R51;

[0125] Pin 4 of H11L1 chip U40 is connected to PSPLUSB, and pin 2 of U40 is connected to PSINPUTB through resistor R47;

[0126] The 2nd and 3rd pins of the rotary encoder J13 are connected to PSINPUTA and PSINPUTB respectively;

[0127] The anode of OP1 input terminal of EL357N(B)(TA)-G chip is connected to +12VPS through resistor R52, the cathode of OP1 input terminal is connected to PSWZFK11 through diode E9, the collector of OP1 output terminal is connected to VCC-3.3V, and the emitter of OP1 output terminal is connected to PSWZFK1;

[0128] Pin 2 of position detection switch J15 is connected to PSWZFK11.

[0129] The HKC-F Hall current sensor J18 is used to detect the current of the crushing and extrusion drive motor to prevent the crushing head 43 from getting stuck or pressing hard raw coal or other hard stones during the downward pressing process, causing overcurrent damage to the motor.

[0130] J10 is connected to the control signal input port of the crushing and extruding driving motor of the coal crushing and extruding device 23.

[0131] like Fig. 20 As shown, the combined circuits of the P521 chip, HFD4 / 5 relay, HF49FD / 012-1H11 relay and CJ20-630A (220) module are two groups, which are used for forward and reverse control of the crushing and extruding drive motor. In forward control, the crushing head 43 of the coal crushing and extruding device 23 descends to crush the raw coal into small pieces. In reverse control, the crushing head 43 of the coal crushing and extruding device 23 rises, which facilitates the grinding disc assembly 49 to carry large pieces of raw coal to the bottom of the coal crushing and extruding device 23 for crushing.

[0132] like Fig. 20 As shown in the figure, the forward and reverse control of the crushing and extruding drive motor is completed by adjusting the phase sequence of the motor drive power supply. A\B\C drives the motor forward, and C\B\A drives the motor reverse. Two contactors (K101, K102) are used for driving, and the control circuit is simple, the reliability is high, and the price is low.

[0133] If the two contactors are attracted and turned on at the same time, phases A and C are directly connected, causing a circuit short circuit accident. In order to avoid such accidents, the conventional circuit will stay for 2 seconds when controlling the phase change, which is used for the delay time of one contactor opening and the other one attracting, to avoid the possibility of simultaneous attraction. The normally closed auxiliary contacts of the contactor will be used for interlocking in the circuit, and the common end of the coil of contactor K101 will be connected in series with the normally closed auxiliary contacts of contactor K102. When K102 is attracted, the normally closed auxiliary of K102 is disconnected, and the common end of the coil of K101 cannot be attracted because it is disconnected. Although the above protection method can avoid most of the simultaneous conduction problems, when a fault occurs, the U49 processor cannot detect it (contactor failure, U49 has no detection circuit and cannot detect it) or the auxiliary contacts are stuck or not attracted, etc., problems will also occur.

[0134] The present 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 to detect whether the contactor is closed and interlock control of drive signal disconnection.

[0135] The NO\NO end of the K101 contactor is a normally open auxiliary contact. When K101 is energized, the auxiliary contacts NO and NO are turned on. After the conduction, 5V passes through the normally open auxiliary contact NO to NO to the input end of U36, and the output end of U36 is turned on. After the conduction, PSNetLabel34 becomes a high level. 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 passes through U36 to the K12 coil to cause K12 to be energized. PSDJ2-FCTR connects K12's 2nd pin (normally closed pin) and disconnects it from the common end of K12's 3rd pin. K12's 3rd pin is connected to K12's 4th pin, disconnecting the drive signal of U37 and short-circuiting it with GND, so that U37 cannot be turned on regardless of interference or any drive, and has the function of preventing conduction at the drive layer.

[0136] J15 Fig. 9 The extrusion device in the proximity switch 47.

[0137] K8 is an intermediate relay used for power amplification, driving AC 220V signal, and driving contactor coil.

[0138] like Fig. 20 As shown, the PSDJ2-ZCTR terminal of U49 is connected to R36. When R36 is at a high level, it is connected to the common terminal 3 pin through the normally closed terminal of K9, to the primary side of U35. After the secondary side of U35 is turned on, +12VPS is connected to the K8 coil and to the collector of Q3. Because Q3 is connected to the output of the secondary side of U35, Q3 is turned on, causing the relay K8 to be energized, the common terminal of K8 and the normally open contact are turned on, and the coil pin (PSK7NO) of K101 is connected to the N-LINE-IN (mains 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), and is connected to the (B-LINE-IN) mains B phase line. Under normal conditions, K102 is not energized, and its NO terminal is in a normally closed state. At this time, the two pins of the K101 coil are connected to the mains 220V, and the K101 coil is turned on. K101 is energized, and 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 extruding device 23, and the coal crushing and extruding device 23 moves downward.

[0139] The nitrogen fire extinguishing valve control circuit includes P521 chip U3 and P521 chip U5. The anode of U3 input terminal is connected to MH1 through resistor R2, the cathode of U3 input terminal is connected to GND, the collector of U3 output terminal 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;

[0140] The anode of U5 input terminal is connected to MH2 through resistor R11, the cathode of U5 input terminal is connected to GND, the collector of U5 output terminal is connected to pin 1 of HF32FA / 012-ZS1 relay K2, 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.

[0141] J2 Figure 1 Control port of nitrogen tank 9.

[0142] The temperature of the grinding disc is detected by the temperature sensing cable 16. When the temperature of the grinding disc exceeds 200°C, it can be set to determine that coal is heated and ignited, control the sound and light alarm action, and drive the nitrogen valve to spray nitrogen to extinguish the fire.

[0143] The present invention is applied in a high-power AC motor environment, where the external magnetic field interference is relatively large. In order to reduce the possibility that the nitrogen fire extinguishing valve control circuit is erroneously triggered by interference signals, two pins MH1 and MH2 are used for driving. If it is necessary to drive the nitrogen injection, MH1 needs to be set to a high level, while MH2 is at a low level, in order to drive the injection. The advantage of such a design is that when interference occurs, MH1 and MH2 are arranged side by side in the circuit design. When interference occurs, the interference signals are the same, and MH1 and MH2 are either all high or all low, and there will not be one high and one low. Only when the correct driving signal arrives, will they be at opposite levels.

[0144] Under normal conditions, MH1 is low level, MH2 is high level, U3 is not conducting, U5 is conducting, K1 is not energized, K2 is energized, K1's 5th pin is not connected to the normally open pin 4, J2's 1st pin is not connected to the power supply INPUT+, J2's 2nd pin is connected to K2's 3rd pin, because K2 is energized, its common terminal is not connected to the normally closed pin 3, J2's 2nd pin is not connected to the power supply negative INPUT-. J2 is not connected to the driving power supply, and the nitrogen fire extinguishing device connected to J2 does not spray. When a fire is detected, U49 drives MH1 high and MH2 low, U3 is turned on, U5 is turned on, and pins 5 and 4 of K1 are connected, and then the connection is made through pin 1 of J2 to the nitrogen fire extinguishing device, to pin 2 of J2, and to pin 3 of K2. Because K2 is not energized, pin 3 is normally closed and connected to pin 5. Pin 2 of J2 passes through pin 3 of K2 to pin 5 of K2 to the negative pole of the power supply INPUT- to form a loop. Pins 1 and 2 of J2 have power to drive the nitrogen fire extinguishing device to trigger the spray for fire extinguishing.

[0145] 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 the SS8050 tube Q5, the emitter of Q5 is connected to GND, and the collector of Q5 is connected to XL1;

[0146] 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.

[0147] J8 is connected to the 220V mains input, J9 is Figure 3 A control port of the coolant pump 56 on the coolant tank 10 .

[0148] The temperature sensing cable 16 can be set to detect that the temperature exceeds 80 degrees, and U49 controls the coolant pump 56 through SBKZ to start working to cool the grinding roller sleeve 34 to prevent the high temperature of the grinding roller sleeve 34 from causing a fire. Long-term friction of the grinding roller sleeve 34 will cause the surface temperature to continue to rise.

[0149] 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 K7805-1000L module U29 through inductor L8, pin 3 of U29 is connected to pin 3 of XC6206P332MR module U10, and pin 2 of U10 is connected to +3.3V1;

[0150] The 3-5 pins of ADUM1301 chip U11 are connected to RTS1, TXD1, and RXD1 respectively. The 12-14 pins of U11 are connected to the 1, 4, and 2 pins of VP11 chip U13 respectively. The 7 pin of U13 is connected to the 1 pin of ACT45B-510-2P-TL003 common mode filter L6 through resistor R68. The 2 pin of L6 is connected to AIOB1, the 4 pin of L6 is connected to AIOA1, and the 6 pin of U13 is connected to the 3 pin of L6 through resistor R73.

[0151] Pins 2 and 3 of J5 of WT-VB01-485 vibration sensor are connected to AIOB1 and AIOA1 respectively.

[0152] like Fig.24 , 25 As shown, the three-dimensional posture sensor communication circuit is provided with two groups of identical circuits, corresponding to two groups of wheel hub motor grinding roller modules 24 respectively.

[0153] Three-dimensional attitude sensor communication circuit Fig. 9 The three-dimensional posture sensor module 15 is used.

[0154] 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 the raw coal, and judge the volume of the raw coal based on the change.

[0155] 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, and uses U11 for safety isolation to block interference signals on the right side of U11.

[0156] The grinding disc rotation control circuit comprises a P521 chip U27, the anode of the input end of U27 is connected to MPK102-NC through a diode D5, the emitter of the output end of U27 is respectively connected to the 1st pin of the HFD4 / 5 relay K4 and one end of the resistor R17, and the other end of R17 is connected to MPNetLabel34; the 2nd pin of K4 is connected to MPDJ2-ZCTR through a resistor R18, the 3rd pin of K4 is connected to the anode of the input end of the P521 chip U31, and the cathode of the input end of U31 is connected to the 4th pin of K4; the collector of the output end of U31 is connected to +12VMP, the emitter of the output end of U31 is connected to the base of the S8050 tube Q1 through a resistor R16, the emitter of Q1 is connected to GNDMP, and the collector of Q1 is connected to MPXLA;

[0157] The two ends of the controlled switch of HF49FD / 012-1H11 relay K3 are connected to N-LINE-IN and MPK7NO respectively, and the two ends of the control end of K3 are connected to 12V and MPXLA respectively;

[0158] 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 the 3rd, 2nd, and 1st pins of J3 respectively;

[0159] The 1st pin of the EWN10-24S12H module U39 is connected to INPUT+ through fuse F3 and diode D18, the 2nd pin of U39 is connected to INPUT-, and the 6th pin of U39 is connected to +12VMP;

[0160] Pin 4 of the H11L1 chip U20 is connected to MPPLUSA, and pin 2 of U20 is connected to MPINPUTA through resistor R106;

[0161] Pin 4 of H11L1 chip U25 is connected to MPPLUSB, and pin 2 of U25 is connected to MPINPUTB through resistor R109;

[0162] The 2nd and 3rd pins of the rotary encoder J16 are connected to MPINPUTA and MPINPUTB respectively;

[0163] 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;

[0164] Pin 2 of position detection switch J17 is connected to MPWZFK11.

[0165] J16 is a rotary encoder interface matching the drive motor 8.

[0166] J3 is the control port of the drive motor 8.

[0167] like Fig.26 As shown, there are two combination circuits of P521 (U27, U32), HFD4 / 5 (K4, K7), HF49FD / 012-1H11, and CJ20-630A (220), which are used to drive the forward and reverse rotation control of the motor 8 and complete the forward and reverse rotation control of the grinding disc.

[0168] 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.

[0169] The position detection switch J17 is the grinding disc proximity switch 59.

[0170] U49 determines the zero position of the grinding disc through the position detection switch J17, and starts to rotate to process the raw coal according to the zero position. For example, the coal block crushing and extrusion device 23 is at the zero point 240 degrees, the first hub motor grinding roller module 24 is at the 120 degree position, and the second hub motor grinding roller module 24 is at the 360 ​​degree position, and the reference zero point is calibrated. The rotary encoder J16 can only record an increment, without the zero position. Only the increment cannot determine the position of the hub motor grinding roller module 24 and the coal block crushing and extrusion device 23. The zero position has a constant angle with the hub motor grinding roller module 24 and the coal block crushing and extrusion device 23. Then, through the rotary encoder J16, any position on the grinding disc can be controlled to turn to the specified hub motor grinding roller module 24 and the coal block crushing and extrusion device 23 to perform the operation.

[0171] 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;

[0172] The 1~3, 9, and 10 pins of the AD7788ARMZ-REEL chip U15 are connected to CLK-LG, CS-LG, VDIN-LG, DOUT-LG, and DIN-LG respectively;

[0173] Connect the 3rd pin of HKC-F Hall current sensor J19 to LGOUT;

[0174] The anode of the input terminal of the P521 chip U42 is connected to LGK102-NC, and the emitter of the output terminal of U42 is connected to the 1st pin of the HFD4 / 5 relay K14 and one end of the resistor R30 respectively, and the other end of R30 is connected to LGNetLabel34; the 2nd pin of K14 is connected to LGDJ2-ZCTR through the resistor R31, the 3rd pin of K14 is connected to the anode of the input terminal of the P521 chip U43, and the cathode of the input terminal of U43 is connected to the 4th pin of K14; the collector of the output terminal of U43 is connected to +12VLG, and the emitter of the output terminal of U43 is connected to the base of the S8050 tube Q7 through the resistor R29, the emitter of Q7 is connected to GNDLG, and the collector of Q7 is connected to LGXLA;

[0175] The two ends of the controlled switch of HF49FD / 012-1H11 relay K13 are connected to N-LINE-IN and LGK7NO respectively, and the two ends of the control end of K13 are connected to 12V and LGXLA respectively;

[0176] 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 the 3, 2, and 1 pins of J20 respectively.

[0177] The 1st pin of the EWN10-24S12H module U46 is connected to INPUT+ through fuse F4 and diode D23, the 2nd pin of U46 is connected to INPUT-, and the 6th pin of U46 is connected to +12VLG;

[0178] Pin 4 of H11L1 chip U48 is connected to LGPLUSA, and pin 2 of U48 is connected to LGINPUTA through resistor R64;

[0179] Pin 4 of H11L1 chip U47 is connected to LGPLUSB, and pin 2 of U47 is connected to LGINPUTB through resistor R62;

[0180] The 2nd and 3rd pins of the rotary encoder J22 are connected to LGINPUTA and LGINPUTB respectively.

[0181] J19 is a Hall current sensor that is matched with the hub motor in the hub motor grinding roller module 24.

[0182] J20 is the control interface of the hub motor in the hub motor grinding roller module 24.

[0183] Fig.28 , 29 There are two combination circuits of P521, HFD4 / 5 (K14), HF49FD / 012-1H11 and CJ20-630A (220) in each wheel hub motor grinding roller module, which are used for the forward and reverse rotation control of the wheel hub motor and complete the forward and reverse rotation control of the grinding roller sleeve 34. When the grinding roller sleeve 34 is stuck by a large coal block, it can be freed by the forward and reverse rotation of the grinding roller sleeve 34.

[0184] 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.

[0185] When the raw coal is large and jams the grinding roller sleeve 34, the working current of the hub motor will increase sharply. Through the current transformer J19, U49 detects the current change of the hub motor. U49 controls the hub motor to stop rotating and reverse rotation to exit the jam state. Every time the power is turned on, the grinding disc rotates automatically. When J17 is triggered, this position is defined as zero degrees, and the counting pulses of the rotary encoder J16 are cleared. After that, the grinding disc rotates and counts the pulses of the rotary encoder. U49 accumulates and counts the pulses sent by the encoder J16, and judges the current rotation angle of the grinding disc by the current count value. The pulse encoder sends about 36,000 pulses for one rotation of the grinding disc, and every 1,000 pulses is 1 degree. The position of the hub motor grinding roller module 24 and the position of the coal block crushing and extrusion device 23 are both fixed angles with the zero degree of the grinding disc. When a large raw coal block is stuck in the grinding roller sleeve 34, after detecting the position of the large raw coal block, U49 records which wheel hub is currently stuck (which wheel hub motor working current increases sharply, indicating which wheel hub is stuck), controls the grinding disc to transfer the large raw coal block to the bottom of the coal block crushing and extrusion device 23, controls the forward and reverse rotation of the coal block crushing and extrusion device 23 and the drive motor 8, and the coal block crushing and extrusion device 23 repeatedly squeezes downward to repeatedly perform crushing operations on a small area. The raw coal falls from the middle, and the subsequent falling raw coal will collide the large pieces into the outer crushing operation area of ​​the grinding disc. By controlling the forward and reverse rotation of the wheel hub motor and the drive motor 8, as well as the lifting and lowering of the pressure frame 12, the stuck coal block is separated from the grinding roller sleeve 34, and the grinding disc assembly 49 moves the large coal block to the bottom of the coal block crushing and extrusion device 23. When the grinding roller sleeve 34 presses on a larger raw coal, it will be judged through the detection value of the three-dimensional posture sensor module 15. At this time, the current rotation angle of the grinding disc is recorded to judge the angle of the larger raw coal at the reference zero point position of the grinding disc, that is, the position of the larger raw coal block is detected.

[0186] U49 drives the grinding roller sleeve 34 to rotate forward (clockwise) through LGDJ2-ZCTR, and U49 drives the grinding roller sleeve 34 to rotate reverse (counterclockwise) through LGDJ2-FCTR. When LGDJ2-ZCTR and LGDJ2-FCTR are both low, the hub motor stops rotating. Taking the hub motor from forward rotation to stop as an example, the initial state LG1DJ2-FCTR is always low, the initial state of LGDJ2-ZCTR is high, and the hub motor rotates. When LGDJ2-ZCTR changes from high to low, U43 enters the closed state, R129 is low, Q7 enters the cut-off area, Q7 is closed, K13 is closed because Q7 is closed, K13 coil is released and does not attract, and K13 common terminal and normally open terminal are disconnected.

[0187] The coil foot LGK7NO of K107 is disconnected from N-LINE-IN, the L1 port of K107 is disconnected from the L2 port, the L3 port is disconnected from the L4 port, and the L5 port is disconnected from the L6 port. The hub motor loses the connection with the power supply and the motor stops rotating.

[0188] Through the three-dimensional posture sensor module 15 (i.e. Fig.24 In the process (J5), the offset angle of the grinding roller frame 33 is collected to determine whether a large volume of coal blocks passes through the lower end of the grinding roller sleeve 34, and the grinding roller sleeve 34 is lifted. Since the grinding roller frame 33 is connected to the pressing frame 12 through the grinding roller frame hinge 32, the grinding roller frame 33 is lifted.

[0189] like Fig.28 As shown, when R31 is at a high level, the hub motor rotates forward; when R56 is at a high level, the hub motor rotates reversely; when both R31 and R56 are at a low level, the hub motor stops rotating.

[0190] U49's LGDJ2-ZCTR is connected to R31. When R31 is at a high level, it goes through K14's normally closed end to the common terminal 3 pin, to the primary side of U43. After the secondary side of U43 is turned on, +12VLG1 goes to K13 coil to the collector of Q7. Because Q7 is controlled by the output of the secondary side of U43, Q7 conduction causes relay K13 to be attracted, and K13's common terminal and normally open contact are turned on. K107's coil pin (LGK7NO) is connected to N-LINE-IN (mains neutral line) through K13's normally open contact to the common contact. The other pin of K107 coil is connected to K106's NC terminal (LGK102-NO), and connected to B-LINE-IN (mains B phase line). Under normal conditions, K106 is not attracted, and its NO terminal is in a normally closed state. At this time, the two pins of K107 coil are connected to the mains 220V, and K107 coil is turned on. K107 is energized, and its common terminals L1, L2, and L3 are connected to L2, L4, and L6 respectively, connecting the three-phase power supply to J20, and J20 is connected to the hub motor, and the hub motor rotates in the forward direction.

[0191] The raw coal enters the coal mill from the coal inlet 1 and falls onto the grinding disc assembly 49 under the action of gravity. The grinding disc is designed with a conical protrusion 57, where the coal blocks are first impacted and squeezed, thereby achieving initial crushing. This design allows some coal blocks to be coarsely crushed at the beginning of entering the equipment, which helps to improve the subsequent grinding efficiency. However, for larger coal blocks, gravity alone is not enough to complete the crushing. At this time, the grinding disc continues to send the coal blocks to the coal block crushing and squeezing device 23 area.

[0192] When the unbroken large coal blocks are transported to the bottom of the coal block crushing and squeezing device 23 by the rotating grinding disc, the coal block crushing and squeezing device 23 further crushes the coal blocks accurately. The coal block crushing and squeezing device 23 is equipped with a squeezing device proximity switch 47 (i.e. Fig.21In J15), the extrusion device proximity switch 47 cooperates with the trigger block 68 of the extrusion device proximity switch to calibrate the zero point position to ensure 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 the zero point. When the coal block enters the crushing area, the circuit will drive the crushing head 43 to descend and perform the crushing operation.

[0193] To ensure the accuracy of crushing, the crushing head control circuit is equipped with a rotary encoder J13 and a current monitoring device (i.e., Hall current sensor J18). The encoder records the number of descent turns of the crushing head 43, and J18 monitors the current of the vertical motion drive motor of the crushing head 43. Turns control: When the number of turns of the encoder reaches the set value, the crushing is completed and the crushing head 43 stops descending. This set value indicates that the coal block has been crushed to the required diameter.

[0194] Current monitoring: In case of current overload, the equipment will trigger the crushing head 43 to repeatedly crush until the rated number of turns is reached to avoid motor overload damage. In this way, it is ensured that the coal is effectively crushed to the appropriate size.

[0195] After the large coal blocks processed by the coal block crushing and extrusion device 23 are further crushed, they are transported to the hub motor grinding roller module 24 through the rotation of the rotating body 26 for fine crushing and grinding. The hub motor grinding roller module 24 rotates and cooperates with the rotation of the rotating body 26, and can control the hub motor grinding roller module 24 to rotate in the same direction as the liner 25 to squeeze the coal blocks and grind the coal blocks into coal powder. The grinding disc proximity switch 59 (i.e. Fig. 27 J17 in the figure 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 posture sensor module 15, which monitors the deviation angle of the hub motor grinding roller module 24 in real time to ensure that the hub motor grinding roller module grinds the coal block evenly, achieving an ideal coal grinding effect and efficient coal grinding.

[0196] In order to control the particle size of coal powder, three hydraulic cylinders 19 are installed on the base 20 of the equipment. The upper end of the hydraulic cylinder is connected to the 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 to accurately adjust the particle size of the coal powder. This design gives the equipment flexible particle size adjustment capabilities, enabling it to meet the requirements of coal powder of different specifications. In addition, the drive motor 8 is connected to the reduction gear 27 and the grinding disc base 30 through the coupling 28, driving the grinding disc, liner and other components to rotate smoothly, further enhancing the uniformity and efficiency of the coal grinding process. According to the calibrated position of the hydraulic rod, in conjunction with the rotary encoder, the current position of the hydraulic rod is guided, and it is judged whether it has reached the limit position, and the length of the hydraulic rod 18 is adjusted.

[0197] The high temperature generated during the coal powder grinding process may affect the stability of the equipment. For this reason, the equipment is equipped with an efficient cooling and fire extinguishing system. The transmission pipeline 13 in the equipment is composed of a hydraulic coolant input pipe 52, a hydraulic coolant output pipe 53 and a nitrogen transmission pipe. The hydraulic coolant input pipe 52 and the hydraulic coolant output pipe 53 are used for the entry and discharge of coolant and are controlled by the coolant pump control circuit. The nitrogen transmission pipe is used to supply nitrogen. The hydraulic coolant forms a cooling circuit through the coolant inlet pipe 37 and the grinding roller sleeve 34 to provide continuous cooling for the grinding roller to prevent the temperature from being too high. The nitrogen in the nitrogen tank 9 enters the interior of the device through an independent channel. When a fire occurs, the nitrogen can quickly fill the coal grinding area and effectively suppress combustion, thereby ensuring the safe operation of the equipment.

[0198] The cold air flow entering the air inlet 7 blows the ground coal powder evenly to the coal outlet 2, and transports the coal powder to the next processing step. This air flow transport method not only helps to discharge the coal powder, but also reduces the dust accumulation inside the equipment and optimizes the working environment of the equipment.

Claims

1. A coal mill structure for improving efficiency, comprising a shell, a coal inlet (1) and a coal outlet (2) are arranged at the upper end of the shell, an air inlet (7) is arranged at the lower part of the shell, and a driving motor (8) for driving a grinding disc assembly (49) to rotate is arranged at the lower end of the shell; characterized in that A press frame (12) is arranged at the upper part of the shell, the end of the press frame (12) is connected to the upper end of the hydraulic rod (18), and the hydraulic cylinder (19) of the hydraulic rod (18) is arranged on a base (20) at the lower part of the shell; the lower end of the press frame (12) is connected to a hub motor grinding roller module (24) and a coal block crushing and extrusion device (23), and a grinding disc assembly (49) is arranged below the press frame (12).

2. A coal mill structure for improving efficiency according to claim 1, characterized in that The housing comprises a top housing (4), a middle housing (5), a lower housing (6) and a bottom casing (11); an inspection port (48) is provided on the lower housing (6); a nitrogen tank (9) and a coolant tank (10) are provided at the inspection port (48); and an air inlet (7) is provided below the inspection port (48); A top support plate (3) is arranged at the upper end of the top shell (4), and a coal inlet (1) and a coal outlet (2) are arranged on the top support plate (3); an inverted truncated cone-shaped cylinder (61) is arranged in the middle of the top shell (4), and the upper end of the inverted truncated cone-shaped cylinder (61) is connected to the top support plate (3) via a top support plate connecting bolt (62); a plurality of strip-shaped openings (63) are evenly distributed on the side wall of the lower part of the inverted truncated cone-shaped cylinder (61) along the circumferential direction.

3. A coal mill structure for improving efficiency according to claim 1, characterized in that The pressing frame (12) is triangular in shape, and comprises three groups of hydraulic rods (18) and hydraulic cylinders (19), one coal block crushing and squeezing device (23), and two wheel hub motor grinding roller modules (24); the lower ends of two sides of the triangular pressing frame (12) are respectively connected to a wheel hub motor grinding roller module (24), and the lower end of the other side of the triangular pressing frame (12) is connected to the coal block crushing and squeezing device (23).

4. A coal mill structure for improving efficiency according to claim 1, characterized in that The wheel hub motor grinding roller module (24) comprises a U-shaped grinding roller frame (33), wherein hinges (32) are arranged at the upper ends of both sides of the grinding roller frame (33), wherein the upper ends of the hinges (32) are connected to the pressing frame (12) via fasteners, and the lower ends of the hinges (32) are hinged to the upper ends of the grinding roller frame (33), and 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 arranged on the inner side of the front end of the grinding roller motor housing (41), and is 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 the grinding roller motor rear cover plate (45) via fasteners; the middle part of the grinding roller motor shaft (31) passes through the middle part 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); and a grinding roller sleeve (34) is arranged on the outer periphery of the grinding roller motor housing (41).

5. A coal mill structure for improving efficiency according to claim 4, characterized in that The front end of the grinding roller sleeve (34) is provided with an annular cooling liquid groove (51), the front end of the cooling liquid 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 surface of the cooling liquid groove (51), and the grinding roller front cover plate (35) and the grinding roller sleeve (34) are connected by fasteners; the cooling liquid groove (51) is connected to one end of the cooling liquid supply pipe (37) through one side, and the cooling liquid groove (51) is connected to one end of the cooling liquid return pipe (36) through the other side.

6. A coal mill structure for improving efficiency according to claim 1, characterized in that The upper end of the press frame (12) is provided with a transmission pipeline (13), which includes a hydraulic coolant input pipe (52), a hydraulic coolant output pipe (53) and a nitrogen transmission pipe (64). One end of the hydraulic coolant input pipe (52) is connected to the coolant supply pipe (37) through a universal joint, one end of the hydraulic coolant output pipe (53) is connected to the coolant return pipe (36) through a universal joint, the other end of the hydraulic coolant input pipe (52) is connected to the oil outlet of the coolant tank (10), and the other end of the hydraulic coolant output 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 branch pipe (64) faces the grinding disc assembly (49).

7. A coal mill structure for improving efficiency according to claim 1, characterized in that The grinding disc assembly (49) comprises a grinding disc base (30), the middle part of the grinding disc base (30) is a rotating body (26), the middle part of the upper end of the rotating body (26) has a conical protrusion (57), the upper end of the rotating body (26) is provided with an annular lining plate (25) around the center of the rotating body (26), the outer periphery of the upper end surface of the lining plate (25) is an arc surface that transitions from the inner bottom to the outer top; the upper end of the rotating body (26) is provided with an annular blowing plate ( 22), the upper end surface of the blowing plate (22) is an arc surface that transitions from the inner lower part to the outer upper part, the upper end surface of the blowing plate (22) is provided with a blowing port (42), and the blowing direction of the blowing port (42) is upward; the air inlet of the blowing plate (22) is connected with the air inlet (7); the coal inlet (1) is provided at the upper end of the coal inlet pipe (60); the lower end of the coal inlet pipe (60) is placed below the pressing frame (12) and faces the center of the grinding disc assembly (49).

8. A coal mill structure for improving efficiency according to claim 7, characterized in that The inner upper end of the lining plate (25) is a plane, and an annular temperature sensing cable cover plate placement groove is arranged around the center of the rotating body (26) on the plane, and a spiral temperature sensing cable placement groove is arranged around the center of the rotating body (26) on the bottom surface of the temperature sensing cable cover plate placement groove, and a temperature sensing cable (16) is arranged in the temperature sensing cable placement groove, and a temperature sensing cable cover plate (17) is arranged in the temperature sensing cable cover plate placement groove.

9. A coal mill structure for improving efficiency according to claim 1, characterized in that The coal block crushing and extruding device (23) comprises a crushing and extruding 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); the outer wall of the crushing and extruding shell (23-1) is provided with an extruding device proximity switch (47); the middle part of the crushing and extruding shell (23-1) is connected to a 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 extruding driving motor; the crushing and extruding shell and the crushing and extruding driving motor are connected to a pressing frame (12); A threaded hole is provided in the middle of the upper end of the first telescopic shell (23-5) corresponding to the first telescopic threaded rotating shaft (23-2); the outer wall of the first telescopic shell (23-5) is connected to the inner wall of the crushing and extruding shell (23-1) through a slider slide groove structure; the middle of the upper end of the first telescopic shell (23-5) has a connecting portion extending downward, and the connecting portion is connected to the upper end of the second telescopic rotating shaft (23-3) through a first bearing (23-8); the upper end of the second telescopic threaded rotating shaft (23-3) is fixedly connected to the lower end of the first telescopic threaded rotating shaft (23-2); A threaded hole is provided in the middle of the upper end of the secondary telescopic shell (23-6) 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 sliding groove structure; the middle of the upper end of the secondary telescopic shell (23-6) has a connecting portion extending downward, and the connecting portion is connected to the upper end of the tertiary telescopic rotating shaft (23-4) through a 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); The upper end of the third-stage telescopic shell (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 shell (23-7) is a crushing head (43); the side wall of the crushing head (43) is provided with a trigger block (68) of the extrusion device proximity switch corresponding to the extrusion device proximity switch (47); the outer wall of the third-stage telescopic shell (23-7) is connected to the inner wall of the second-stage telescopic shell (23-6) through a slider slot structure.

10. A coal mill structure for improving efficiency according to claim 4, characterized in that The grinding roller frame (33) is provided with a three-dimensional posture sensor module (15); the blowing plate (22) is provided with a grinding disc proximity switch (59); and the outer end of the lining plate (25) is provided with a triggering protrusion (58) of the grinding disc proximity switch corresponding to the grinding disc proximity switch (59); It also includes 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 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 output port of the power supply circuit is respectively connected to the power port of the touch screen control circuit, the power port of the audible and visual alarm circuit, the power port of the data control processing circuit, the power port of the Ethernet circuit, the power port of the temperature acquisition circuit, the power port of the crushing head control circuit, the power port of the nitrogen fire extinguishing valve control circuit, and the power port of the coolant pump control circuit. The power port of the three-dimensional attitude sensor communication circuit, the power port of the grinding disc rotation control circuit, and the power port of the hub motor control circuit are connected, and the signal transmission port of the data control processing circuit is respectively connected to the signal transmission port of the touch screen control circuit, the signal transmission port of the sound and light alarm circuit, the signal transmission port of the Ethernet circuit, the signal transmission port of the temperature acquisition circuit, the signal transmission port of the crushing head control circuit, the signal transmission port of the nitrogen fire extinguishing valve control circuit, the signal transmission port of the coolant pump control circuit, the signal transmission port of the three-dimensional attitude sensor communication circuit, the signal transmission port of the grinding disc rotation control circuit, and the signal transmission port of the hub motor control circuit.

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