Flame-retardant coal crushing device

Abstract

The invention belongs to the technical field of thermal power fuel treatment equipment and coal conveying system safety, and particularly relates to a flame-retardant coal crushing device which comprises a main machine base and further comprises an upper crushing chamber arranged above the main machine base, and the lower surface of the upper crushing chamber is fixedly connected with a lower crushing chamber. The upper crushing chamber is fixedly connected with the main machine base, the lower crushing chamber is fixedly connected with the main machine base, the upper surface of the upper crushing chamber is fixedly connected with a feeding hopper, the lower surface of the main machine base is fixedly connected with a discharging hopper, crushing rollers are symmetrically arranged in the upper crushing chamber, and breaking hammers are symmetrically arranged in the lower crushing chamber; the whole crushing process can be covered through the three-component annular gas distribution pipe and the tangent nitrogen spray head, the cooling jacket is matched for temperature control, spontaneous combustion of coal is avoided, nitrogen is recycled, energy consumption is reduced, different coal can be adapted, equipment can be stabilized and noise can be reduced through the damping spring and the adjusting screw rod, and the overall structural stability is improved through the supporting reinforcing piece; the operation and maintenance cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of safety technology of thermal power fuel processing equipment and coal conveying system, and specifically relates to a flame-retardant coal crushing device. Background Technology

[0002] In thermal power production, coal is the main fuel, and the safety and efficiency of its processing are directly related to the stable operation of the entire power plant. Among them, lignite, long-flame coal and other coal types that are easy to spontaneously combust or have high volatile matter content usually need to be crushed before entering the boiler for combustion in order to improve their combustion efficiency. However, this critical crushing process is fraught with huge safety risks. During the crushing process, the high-speed impact and intense friction of the mechanical parts on the coal not only generate a large amount of combustible coal dust, but also accumulate considerable heat and may generate potential sparks. When the concentration of coal dust suspended in the crushing chamber reaches the explosion limit and encounters sufficient ignition energy, it is very easy to trigger a chain dust explosion, which has enormous destructive power and seriously threatens the safety of personnel and equipment in thermal power plants, and may cause incalculable production accidents and economic losses. Most existing crushing devices use high-impact crushing, which is highly energy efficient. However, due to the lack of effective control over the heat, sparks and high concentration of coal dust generated during the crushing process, there is a high risk of dust explosion and spontaneous combustion, resulting in insufficient safety. In particular, it is not suitable for coal conveying systems for thermal power plants with extremely high safety requirements. Therefore, a flame-retardant coal crushing device is designed to solve the above problems. Summary of the Invention

[0003] To address the problems mentioned in the background section, this invention provides a flame-retardant coal crushing device. This device utilizes a three-component annular gas distribution pipe and a tangential nitrogen nozzle to cover the entire crushing process. Combined with a cooling jacket for temperature control, it prevents spontaneous combustion of the coal and recovers nitrogen to reduce energy consumption. It is adaptable to different types of coal. Furthermore, it features shock-absorbing springs and an adjusting screw to stabilize the device and reduce noise. Supporting reinforcements enhance overall structural stability and reduce maintenance costs.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a flame-retardant coal crushing device, comprising a main unit base and an upper crushing chamber disposed above the main unit base. A lower crushing chamber is fixedly connected to the lower surface of the upper crushing chamber, and the lower crushing chamber is fixedly connected to the main unit base. A feed hopper is fixedly connected to the upper surface of the upper crushing chamber, and a discharge funnel is fixedly connected to the lower surface of the main unit base. Crushing rollers are symmetrically arranged inside the upper crushing chamber, and crushing hammers are symmetrically arranged inside the lower crushing chamber. An annular gas distribution pipe is installed on the inner wall of the upper and lower crushing chambers. Nitrogen nozzles are symmetrically fixedly connected to the surface of the annular gas distribution pipe. An air inlet main pipe is provided on one side of the upper and lower crushing chambers. The annular gas distribution pipe penetrates the surface of the upper and lower crushing chambers and is fixedly connected to the air inlet main pipe. Cooling jackets are installed on the outer walls of both the upper and lower crushing chambers.

[0005] In a preferred embodiment of the flame-retardant coal crushing device of the present invention, a sliding bearing seat is symmetrically slidably connected to the surface of the upper crushing chamber. The sliding bearing seat is rotatably connected to one of the crushing rollers, and the other crushing roller is rotatably connected to the upper crushing chamber via a fixed bearing seat. A servo motor is mounted on the surface of the main base. A drive gear is rotatably connected to the surface of the upper crushing chamber. The drive gear is fixedly connected to the output shaft of the servo motor. A driven gear is meshed with the surface of the drive gear. The shaft of the crushing roller connected to the fixed bearing seat passes through the surface of the upper crushing chamber and is fixedly connected to the driven gear. A driven gear is also meshed with the surface of the drive gear. The driven gear is rotatably connected to the surface of the upper crushing chamber. A driven gear is meshed with the surface of the driven gear. A driven gear is connected to the surface of the driven gear. The shaft of the crushing roller connected to the sliding bearing seat passes through the surface of the sliding bearing seat and is fixedly connected to the driven gear. A connecting rod is rotatably connected to the surface of the driven gear. The end of the connecting rod away from the driven gear is rotatably connected to the driven gear.

[0006] In a preferred embodiment of the flame-retardant coal crushing device of the present invention, an adjusting threaded rod is rotatably connected to the surface of the upper crushing chamber, the sliding bearing seat is threadedly connected to the adjusting threaded rod, a transmission wheel one is fixedly connected to the end of the adjusting threaded rod away from the upper crushing chamber, a transmission belt is meshed with the surface of the transmission wheel one, a transmission wheel two is meshed with the end of the transmission belt away from the transmission wheel one, a servo motor two is mounted on the surface of the main base, the output shaft of the servo motor two is fixedly connected to the transmission wheel two, the rotating shaft of the breaker hammer passes through the surface of the lower crushing chamber and is fixedly connected to mutually meshing synchronous gears, and a servo motor three is mounted on the surface of the main base, one of the synchronous gears being fixedly connected to the output shaft of the servo motor three.

[0007] As a preferred embodiment of the flame-retardant coal crushing device of the present invention, each of the surfaces of the sliding bearing seats is symmetrically and fixedly connected with a telescopic dustproof window, and the end of each telescopic dustproof window away from the sliding bearing seat is fixedly connected to the upper crushing chamber.

[0008] In a preferred embodiment of the flame-retardant coal crushing device of the present invention, screening baffles are interspersed between the crushing roller and the crushing hammer, and the screening baffles are fixedly connected to the inner wall of the upper crushing chamber.

[0009] In a preferred embodiment of the flame-retardant coal crushing device of the present invention, the number of annular gas distribution pipes is three, respectively disposed on the upper part of the crushing roller and the upper and lower parts of the crushing hammer, and the injection direction of the nitrogen nozzle is tangent to the rotation direction of the crushing roller and the crushing hammer.

[0010] As a preferred embodiment of the flame-retardant coal crushing device of the present invention, a conveying pipe is fixedly connected to the surface of the discharge funnel, a spiral dust collector is provided on one side of the main base, the end of the conveying pipe away from the discharge funnel is fixedly connected to the spiral dust collector, an exhaust pipe is provided on the upper surface of the spiral dust collector, and a filter screen is installed at the connection between the discharge funnel and the conveying pipe.

[0011] As a preferred embodiment of the flame-retardant coal crushing device of the present invention, the cooling jacket is a hollow structure, and the surfaces of the two cooling jackets are symmetrically fixedly connected with connecting pipes. The surface of the connecting pipe of the upper cooling jacket is provided with a water outlet, and the surface of the connecting pipe of the lower cooling jacket is provided with a water inlet.

[0012] As a preferred embodiment of the flame-retardant coal crushing device of the present invention, the lower surface of the main base is symmetrically fixedly connected with support legs, the surface of the support legs is provided with support reinforcement parts, and the surface of the support reinforcement parts and the support legs are threadedly connected with locking bolts.

[0013] In a preferred embodiment of the flame-retardant coal crushing device of the present invention, the surface of the supporting reinforcement is symmetrically threaded with a horizontal adjusting screw one, the lower surface of the supporting leg is threaded with a horizontal adjusting screw two, the lower end of the horizontal adjusting screw one is fixedly connected with a supporting pad, and the surface of the horizontal adjusting screw two is fitted with a shock-absorbing spring, one end of the shock-absorbing spring abutting against the supporting reinforcement, and the end of the shock-absorbing spring away from the supporting reinforcement abutting against the supporting pad.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. Through the coordinated design of the three-component annular gas distribution pipe and the tangential nitrogen nozzle, nitrogen can cover the upper part of the crushing roller and the upper and lower parts of the crusher. As the material rotates, it forms an air curtain that wraps around it, reducing the contact area between the coal and oxygen and completely avoiding the risk of spontaneous combustion caused by frictional heat. At the same time, the spiral dust collector can suck up the mixed gas in the chamber in real time to balance the internal pressure. Combined with the filter screen at the discharge end to intercept dust, it not only avoids the explosion hazard caused by dust leakage, but also provides clean pretreatment for nitrogen recycling and reuse, greatly improving the nitrogen utilization rate and taking into account both safety and economy. Second, the two-stage structure of double crushing rollers and double crushing hammers, combined with cross-distributed screening baffles, can intercept substandard coarse particles for secondary crushing, greatly improving the product qualification rate. The crushing rollers are driven by a servo motor and gear transmission, and with the linkage synchronization mechanism, they can achieve reverse constant speed rotation, avoiding coal slippage and improving coarse crushing efficiency. The combination of sliding bearing seat and adjusting threaded rod can realize roller spacing adjustment to adapt to coal of different hardness, solving the problem of poor applicability of traditional fixed gap devices. 3. The telescopic dustproof window can extend and retract with the sliding bearing seat, preventing dust from entering the transmission components and extending the service life of the gears. The upper and lower cooling jackets are designed in series for circulation, which stabilizes the cavity wall temperature and reduces cooling energy consumption. The support legs are equipped with support reinforcements and shock-absorbing springs, which reduces the vibration amplitude of the equipment during operation. At the same time, the horizontal adjustment screw can compensate for uneven ground and avoid local wear caused by material deviation. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the sieving baffle in this invention; Figure 3 This is a schematic diagram of the connecting rod in this invention; Figure 4 This is a schematic diagram of the retractable dustproof window in this invention; Figure 5This is a schematic diagram of the structure of the servo motor one in this invention; Figure 6 This is a schematic diagram of the nitrogen nozzle in this invention; Figure 7 This is a schematic diagram of the filter screen in this invention; Figure 8 This is a schematic diagram of the water inlet structure in this invention; Figure 9 This is a schematic diagram of the supporting foot structure in this invention; In the picture: 1. Main unit base; 101. Support leg; 102. Support reinforcement component; 103. Locking bolt; 104. Horizontal adjustment screw one; 105. Horizontal adjustment screw two; 106. Support pad; 107. Shock-absorbing spring; 2. Upper crushing chamber; 3. Lower crushing chamber; 4. Feed hopper; 5. Discharge funnel; 6. Crushing roller; 7. Crusher; 8. Main air inlet pipe; 9. Nitrogen nozzle; 10. Annular gas distribution pipe; 11. Cooling jacket; 12. Sliding bearing seat; 13. Adjusting threaded rod; 14. Driven gear one; 15. Driven gear; 16. Driven gear two; 17. Driven gear three; 18. Connecting rod; 19. Servo motor one; 20. Telescopic dustproof window; 21. Water inlet; 22. Transmission wheel one; 23. Transmission belt; 24. Transmission wheel two; 25. Servo motor two; 26. Synchronous gear; 27. Servo motor three; 28. Screening baffle; 29. ​​Conveying pipe; 30. Spiral dust collector; 31. Exhaust pipe; 32. Filter screen; 33. Connecting pipe; 34. Water outlet. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Example 1 Most existing crushing devices use high-impact crushing, which is highly energy efficient. However, due to the lack of effective control over the heat, sparks, and high concentration of coal dust generated during the crushing process, there is a high risk of dust explosion and spontaneous combustion, resulting in insufficient safety. Therefore, a flame-retardant coal crushing device is designed to solve the above problems.

[0018] Furthermore: like Figures 1 to 9 As shown: Based on the above: A flame-retardant coal crushing device includes a main base 1 and an upper crushing chamber 2 disposed above the main base 1. A lower crushing chamber 3 is fixedly connected to the lower surface of the upper crushing chamber 2. The lower crushing chamber 3 and the main base 1 are fixedly connected. A feed hopper 4 is fixedly connected to the upper surface of the upper crushing chamber 2. A discharge funnel 5 is fixedly connected to the lower surface of the main base 1. Crushing rollers 6 are symmetrically arranged inside the upper crushing chamber 2. Crushers 7 are symmetrically arranged inside the lower crushing chamber 3. Annular gas distribution pipes 10 are installed on the inner walls of the upper crushing chamber 2 and the lower crushing chamber 3. Nitrogen nozzles 9 are symmetrically fixedly connected to the surface of the annular gas distribution pipes 10. An air inlet pipe 8 is provided on one side of the upper crushing chamber 2 and the lower crushing chamber 3. The annular gas distribution pipe 10 penetrates the surface of the upper crushing chamber 2 and the lower crushing chamber 3 and is fixedly connected to the air inlet pipe 8. Cooling jackets 11 are installed on the outer walls of both the upper crushing chamber 2 and the lower crushing chamber 3.

[0019] In this implementation scheme: the main unit base 1 provides support for the overall device; the upper crushing chamber 2 is equipped with symmetrical crushing rollers 6; and the lower crushing chamber 3 is equipped with symmetrical crushing hammers 7, forming an upper and lower connection to form a two-stage crushing process. The feed hopper 4 feeds the material, and the discharge funnel 5 discharges the material, realizing directional material conveying. The annular gas distribution pipe 10, nitrogen nozzles 9, and the main gas inlet pipe 8 work together to deliver nitrogen to the upper and lower chambers to inhibit coal oxidation. The cooling jackets 11 on the outer walls of the upper and lower chambers carry away frictional heat through circulating media to prevent high-temperature spontaneous combustion. By integrating the three-in-one structure of "two-stage crushing + nitrogen flame retardancy + jacket cooling", the problem of incomplete flame retardancy and easy spontaneous combustion caused by frictional heat in traditional single-stage crushing devices is solved. The annular gas distribution pipe 10 and the multi-nozzle design ensure that nitrogen evenly covers the entire crushing process, improving flame retardancy efficiency. The two-stage crushing has a clear division of labor and is suitable for different processing needs.

[0020] Furthermore: like Figures 1 to 9 As shown: In an optional embodiment, a sliding bearing seat 12 is symmetrically slidably connected to the surface of the upper crushing chamber 2. The sliding bearing seat 12 is rotatably connected to one of the crushing rollers 6, and the other crushing roller 6 is rotatably connected to the upper crushing chamber 2 via a fixed bearing seat. A servo motor 19 is mounted on the surface of the main base 1. A drive gear 15 is rotatably connected to the surface of the upper crushing chamber 2. The drive gear 15 is fixedly connected to the output shaft of the servo motor 19. A driven gear 14 is meshed with the surface of the drive gear 15. The shaft of the crushing roller 6 connected to the fixed bearing seat passes through the upper crushing chamber 2. The surface of the crushing chamber 2 is fixedly connected to the driven gear 14. The surface of the driving gear 15 is also meshed with the driven gear 16. The driven gear 16 is rotatably connected to the surface of the upper crushing chamber 2. The surface of the driven gear 16 is meshed with the driven gear 17. The shaft of the crushing roller 6 connected to the sliding bearing seat 12 passes through the surface of the sliding bearing seat 12 and is fixedly connected to the driven gear 17. The surface of the driven gear 16 is rotatably connected to the connecting rod 18. The end of the connecting rod 18 away from the driven gear 16 is rotatably connected to the driven gear 17.

[0021] In this embodiment, the servo motor 19 drives the two crushing rollers 6 to rotate in opposite directions through the meshing of the driving gear 15 and the driven gears 14 / 16 / 17, thereby ensuring opposite crushing and synchronous rotation of the two rollers. One of the crushing rollers 6 slides along the surface of the upper chamber through the sliding bearing seat 12, making its position adjustable and allowing for flexible adjustment of the distance between the two rollers. The connecting rod 18 connects the driven gears 16 and 17, limiting their adjustment distance. This ensures that the two crushing rollers 6 rotate in opposite directions at the same speed, preventing the coal from slipping. The sliding bearing seat 12 also allows for adjustable roller spacing, which can be flexibly adapted to the hardness of the coal, solving the problem of poor applicability of traditional fixed-gap devices.

[0022] Furthermore: like Figures 1 to 9 As shown: In an optional embodiment, an adjusting threaded rod 13 is rotatably connected to the surface of the upper crushing chamber 2. The sliding bearing seat 12 and the adjusting threaded rod 13 are threadedly connected. A transmission wheel 22 is fixedly connected to the end of the adjusting threaded rod 13 away from the upper crushing chamber 2. A transmission belt 23 is meshed with the surface of the transmission wheel 22. A transmission wheel 24 is meshed with the end of the transmission belt 23 away from the transmission wheel 22. A servo motor 25 is mounted on the surface of the main base 1. The output shaft of the servo motor 25 is fixedly connected to the transmission wheel 24. The rotating shaft of the breaker 7 passes through the surface of the lower crushing chamber 3 and is fixedly connected to a synchronous gear 26 that meshes with each other. A servo motor 27 is mounted on the surface of the main base 1. One of the synchronous gears 26 is fixedly connected to the output shaft of the servo motor 27.

[0023] In this embodiment: Servo motor 25 drives the adjusting threaded rod 13 to rotate through transmission wheel 24, transmission belt 23, and transmission wheel 1 22, thereby causing the sliding bearing seat 12 to move horizontally and achieve precise adjustment of the roller spacing. Servo motor 3 27 drives the symmetrical crusher 7 in the lower chamber to rotate in the opposite direction at high speed through the meshing synchronous gear 26. The adjustment structure of servo motor 25 and adjusting threaded rod 13 ensures that the roller spacing adjustment accuracy can meet the requirements of fine crushing. The synchronous gear 26 ensures that the two crushers 7 rotate in opposite directions, so that the coal is subjected to bidirectional impact force more evenly and avoids local wear of the chamber caused by unidirectional impact.

[0024] Furthermore: like Figures 1 to 9 As shown: In an optional embodiment, telescopic dustproof windows 20 are symmetrically fixedly connected to the surface of the sliding bearing seat 12, and the end of the telescopic dustproof window 20 away from the sliding bearing seat 12 is fixedly connected to the upper crushing chamber 2.

[0025] In this embodiment, a telescopic dustproof window 20 is connected between the sliding bearing seat 12 and the upper crushing chamber 2. The telescopic dustproof window 20 can slide and extend with the sliding bearing seat 12, which solves the problem of dust leakage between the sliding bearing seat 12 and the chamber. The amount of dust escaped is reduced, avoiding dust pollution and explosion risk in the workshop. The telescopic structure does not affect the adjustment function of the bearing seat.

[0026] Furthermore: like Figures 1 to 9 As shown: In an optional embodiment, screening baffles 28 are interspersed between the crushing roller 6 and the breaker hammer 7, and the screening baffles 28 are fixedly connected to the inner wall of the upper crushing chamber 2.

[0027] In this implementation scheme: screening baffles 28 are distributed crosswise between the crushing roller 6 and the breaker hammer 7. The crosswise distribution design guides the coal to enter the lower chamber evenly, avoiding uneven load on the breaker hammer 7 caused by local accumulation, while reducing the impact force of the coal on the breaker hammer 7 and extending the service life of the equipment.

[0028] Furthermore: like Figures 1 to 9 As shown: In an optional embodiment, there are three annular gas distribution pipes 10, which are respectively arranged on the upper part of the crushing roller 6 and the upper and lower parts of the breaker hammer 7, and the injection direction of the nitrogen nozzle 9 is tangent to the rotation direction of the crushing roller 6 and the breaker hammer 7.

[0029] In this embodiment: the three-point distribution covers the key crushing area, avoiding local oxygen deficiency dead zones, improving flame retardant reliability, and the tangential spray can form an "air curtain" as the material rotates, increasing the contact area between nitrogen and coal, and making oxygen content control more stable.

[0030] Furthermore: like Figures 1 to 9 As shown: In an optional embodiment, a conveying pipe 29 is fixedly connected to the surface of the discharge hopper 5, a spiral dust collector 30 is provided on one side of the main base 1, the end of the conveying pipe 29 away from the discharge hopper 5 is fixedly connected to the spiral dust collector 30, an exhaust pipe 31 is provided on the upper surface of the spiral dust collector 30, and a filter screen 32 is installed at the connection between the discharge hopper 5 and the conveying pipe 29.

[0031] In this embodiment: the discharge hopper 5 is connected to the spiral dust collector 30 through the conveying pipe 29 to draw out the gas and release the excessive gas pressure inside the device. A filter screen 32 is provided at the connection to filter the drawn-out gas. An exhaust pipe 31 is provided at the top of the spiral dust collector 30 to discharge the dust-containing gas.

[0032] It should be noted that the discharged gas is filtered and collected into the tank, thereby realizing the recycling of nitrogen.

[0033] Furthermore: like Figures 1 to 9 As shown: In an optional embodiment, the cooling jacket 11 has a hollow structure, and the surfaces of the two cooling jackets 11 are symmetrically fixedly connected with connecting pipes 33. The surface of the connecting pipe 33 of the upper cooling jacket 11 is provided with a water outlet 34, and the surface of the connecting pipe 33 of the lower cooling jacket 11 is provided with a water inlet 21.

[0034] In this embodiment: the cooling jacket 11 has a hollow structure, and the upper and lower jackets are connected in series through the connecting pipe 33. The lower jacket is provided with a water inlet 21 for low-temperature medium to enter, and the upper jacket is provided with a water outlet 34 for high-temperature medium to exit, forming a circulating cooling. The circulating cooling design stabilizes the cavity wall temperature and avoids spontaneous combustion of coal caused by high temperature. The upper and lower series connection improves the utilization rate of the medium, reduces cooling energy consumption, and the hollow structure of the jacket does not affect the strength of the cavity.

[0035] It should be noted that outlet 34 will be connected to a collection tank to avoid water waste.

[0036] Furthermore: like Figures 1 to 9 As shown: In an optional embodiment, a support leg 101 is symmetrically fixedly connected to the lower surface of the host base 1, and a support reinforcement member 102 is provided on the surface of the support leg 101. Both the support reinforcement member 102 and the surface of the support leg 101 are threadedly connected with locking bolts 103.

[0037] In this embodiment: the support leg 101 on the lower surface of the host base 1 is reinforced with support reinforcement 102 to enhance the structural strength. The two are fixed by locking bolt 103. The support reinforcement 102 improves the overall rigidity, reduces the vibration amplitude of the equipment during operation, and avoids loosening of components due to resonance. The locking bolt 103 can be adjusted according to the installation environment to adapt to different ground strengths and improve installation stability.

[0038] Furthermore: like Figures 1 to 9 As shown: In an optional embodiment, the surface of the support reinforcement 102 is symmetrically threaded with a horizontal adjustment screw 104, and the lower surface of the support leg 101 is threaded with a horizontal adjustment screw 105. The lower ends of the horizontal adjustment screws 104 are fixedly connected with support pads 106. The surface of the horizontal adjustment screw 105 is fitted with a shock-absorbing spring 107. One end of the shock-absorbing spring 107 abuts against the support reinforcement 102, and the end of the shock-absorbing spring 107 away from the support reinforcement 102 abuts against the support pads 106.

[0039] In this embodiment: the support leg 101 achieves fine adjustment of levelness through the horizontal adjustment screws 104 and 105, the support pad 106 works with the shock absorption spring 107 to absorb vibration, the horizontal adjustment screw can compensate for uneven ground and avoid material deviation caused by tilting, the shock absorption spring 107 can absorb operating vibration, reduce the impact on the foundation, and at the same time reduce noise and improve the operating environment.

[0040] Working Principle: The main unit base 1 provides support for the entire device. The upper crushing chamber 2 is equipped with symmetrical crushing rollers 6, and the lower crushing chamber 3 is equipped with symmetrical crushing hammers 7, forming an upper and lower connection to create a two-stage crushing process. The feed hopper 4 feeds the material, and the discharge funnel 5 discharges the material, achieving directional material conveying. The annular gas distribution pipe 10, nitrogen nozzles 9, and the main air inlet pipe 8 work together to deliver nitrogen to the upper and lower chambers, inhibiting coal oxidation. The cooling jackets 11 on the outer walls of the upper and lower chambers carry away frictional heat through a circulating medium, preventing high-temperature spontaneous combustion. By integrating a three-in-one structure of "two-stage crushing + nitrogen flame retardancy + jacket cooling," the problem of incomplete flame retardancy and easy spontaneous combustion due to frictional heat in traditional single-stage crushing devices is solved. The annular gas distribution pipe 10 and the multi-nozzle design... To ensure uniform nitrogen coverage throughout the crushing process, flame retardant efficiency is improved. The two-stage crushing process is clearly defined and adaptable to different processing needs. Servo motor 19 drives two crushing rollers 6 to rotate in opposite directions via the meshing of drive gear 15 and driven gears 14 / 26 / 37, ensuring opposing compression crushing and synchronous rotation of the two rollers. One crushing roller 6 slides along the surface of the upper chamber via a sliding bearing seat 12, allowing for adjustable position and flexible adjustment of the roller spacing. Connecting rod 18 connects driven gears 26 and 37, limiting their adjustment distance. This ensures the two crushing rollers 6 rotate in opposite directions at equal speeds, preventing coal slippage. The sliding bearing seat 12 also allows for adjustable roller spacing, adapting flexibly to coal hardness and addressing the limitations of traditional fixed-gap devices. To address the issue of uneven grinding, servo motor 25 drives the adjusting threaded rod 13 to rotate via transmission wheel 24, transmission belt 23, and transmission wheel 22, causing the sliding bearing seat 12 to move horizontally, thus achieving precise adjustment of the roller spacing. Servo motor 3 27 drives the symmetrical crusher hammers 7 in the lower chamber to rotate in opposite directions at high speed via meshing synchronous gears 26. The adjustment structure of servo motor 25 and adjusting threaded rod 13 ensures that the roller spacing adjustment accuracy meets the requirements of fine crushing. Synchronous gears 26 ensure that the two crusher hammers 7 rotate in opposite directions, resulting in more uniform bidirectional impact on the coal and avoiding localized wear in the chamber caused by unidirectional impact. A telescopic dustproof window 20 connects the sliding bearing seat 12 to the upper crushing chamber 2. The telescopic dustproof window 20 can slide and extend with the sliding bearing seat 12, solving the problem of the sliding bearing seat... The design addresses the dust leakage issue between chamber 12 and the crusher, reducing dust escape and preventing dust pollution and explosion risks in the workshop. The telescopic structure does not affect the bearing seat adjustment function. Screening baffles 28 are cross-distributed between the crushing roller 6 and the crusher 7. This cross-distribution design guides the coal to enter the lower chamber evenly, avoiding uneven load on the crusher 7 caused by local accumulation. It also reduces the impact force of the coal on the crusher 7, extending the equipment's service life. Three-point distribution covers key crushing areas, avoiding localized oxygen deficiency dead zones. Flame-retardant reliability is improved. Tangential spraying forms an "air curtain" as the material rotates, increasing the contact area between nitrogen and coal, resulting in more stable oxygen content control. The discharge hopper 5 is connected to the spiral dust collector 30 via the conveying pipe 29 to extract gas and release excessive gas pressure inside the device.A filter screen 32 is installed at the connection point to filter the extracted gas. An exhaust pipe 31 is installed at the top of the spiral dust collector 30 to discharge dust-laden gas. The cooling jacket 11 has a hollow structure, with the upper and lower jackets connected in series via a connecting pipe 33. The lower jacket has an inlet 21 for the intake of a low-temperature medium, and the upper jacket has an outlet 34 for the outlet of a high-temperature medium, forming a circulating cooling system. This circulating cooling design stabilizes the cavity wall temperature, preventing spontaneous combustion of the coal due to high temperatures. The series connection improves the utilization rate of the medium and reduces cooling energy consumption. Furthermore, the hollow structure of the jacket does not affect the strength of the cavity. The support legs 101 on the lower surface of the main unit base 1 are reinforced with support reinforcements 102 to enhance structural strength. Secured by locking bolts 103, the support reinforcement 102 enhances overall rigidity, reducing equipment vibration and preventing component loosening due to resonance. Locking bolts 103 can be adjusted for tightness according to the installation environment, adapting to different ground strengths and improving installation stability. Support legs 101 achieve fine-tuning of levelness via leveling screws 104 and 105. Support pads 106, in conjunction with damping springs 107, absorb vibration. The leveling screws compensate for uneven ground, preventing material deviation due to tilting. Damping springs 107 absorb operational vibration, reducing impact on the foundation, lowering noise, and improving the operating environment.

[0041] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A kind of fire-retardant coal material crushing device, including main machine base (1), it is characterized by: Also include the upper crushing chamber (2) is arranged above the host base (1), the lower surface of the upper crushing chamber (2) is fixedly connected with the lower crushing chamber (3), the lower crushing chamber (3) and the host base (1) are fixedly connected, the upper surface of the upper crushing chamber (2) is fixedly connected with the feed hopper (4), the lower surface of the host base (1) is fixedly connected with the discharge funnel (5), the inside of the upper crushing chamber (2) is symmetrically provided with a crushing roller (6), the inside of the lower crushing chamber (3) is symmetrically provided with a breaking hammer (7), the inner wall of the upper crushing chamber (2) and the lower crushing chamber (3) is provided with an annular gas distribution pipe (10), the surface of the annular gas distribution pipe (10) is symmetrically fixedly connected with a nitrogen gas nozzle (9), one side of the upper crushing chamber (2) and the lower crushing chamber (3) is provided with an air inlet main pipe (8), the annular gas distribution pipe (10) penetrates the surface of the upper crushing chamber (2) and the lower crushing chamber (3) and is fixedly connected with the air inlet main pipe (8), the outer wall of the upper crushing chamber (2) and the lower crushing chamber (3) is provided with a cooling jacket (11).

2. The flame -retardant coal material crushing device according to claim 1, characterized in that: The surface of the upper crushing chamber (2) is symmetrically slidably connected with a sliding bearing seat (12), the sliding bearing seat (12) is rotatably connected with one of the crushing rollers (6), the other crushing roller (6) is rotatably connected with the upper crushing chamber (2) through a fixed bearing seat, the surface of the host base (1) is provided with a servo motor one (19), the surface of the upper crushing chamber (2) is rotatably connected with a driving gear (15), the driving gear (15) is fixedly connected with the output shaft of the servo motor one (19), the surface of the driving gear (15) is meshingly connected with a driven gear one (14), the rotating shaft of the crushing roller (6) connected with the fixed bearing seat penetrates the surface of the upper crushing chamber (2) and is fixedly connected with the driven gear one (14), the surface of the driving gear (15) is also meshingly connected with a driven gear two (16), the driven gear two (16) is rotatably connected with the surface of the upper crushing chamber (2), the surface of the driven gear two (16) is meshingly connected with a driven gear three (17), the rotating shaft of the crushing roller (6) connected with the sliding bearing seat (12) penetrates the surface of the sliding bearing seat (12) and is fixedly connected with the driven gear three (17), the driven gear two (16) is rotatably connected with a connecting rod (18), one end of the connecting rod (18) away from the driven gear two (16) is rotatably connected with the driven gear three (17).

3. The flame -retardant coal material crushing device according to claim 2, characterized in that: The surface of the upper crushing chamber (2) is rotatably connected to an adjusting threaded rod (13). The sliding bearing seat (12) and the adjusting threaded rod (13) are threadedly connected. The end of the adjusting threaded rod (13) away from the upper crushing chamber (2) is fixedly connected to a transmission wheel (22). The surface of the transmission wheel (22) is meshed with a transmission belt (23). The end of the transmission belt (23) away from the transmission wheel (22) is meshed with a transmission wheel (24). The surface of the main base (1) is equipped with a servo motor (25). The output shaft of the servo motor (25) is fixedly connected to the transmission wheel (24). The rotating shaft of the breaker (7) passes through the surface of the lower crushing chamber (3) and is fixedly connected with a synchronous gear (26) that meshes with each other. The surface of the main base (1) is equipped with a servo motor (27). One of the synchronous gears (26) and the output shaft of the servo motor (27) are fixedly connected.

4. The flame -retardant coal material crushing device according to claim 3, characterized in that: The surface of each sliding bearing seat (12) is symmetrically and fixedly connected with telescopic dustproof windows (20), and the end of each telescopic dustproof window (20) away from the sliding bearing seat (12) is fixedly connected to the upper crushing chamber (2).

5. The flame -retardant coal material crushing device according to claim 4, characterized in that: Screening baffles (28) are intersected between the crushing roller (6) and the breaker hammer (7), and the screening baffles (28) are fixedly connected to the inner wall of the upper crushing chamber (2).

6. The flame -retardant coal material crushing device according to claim 5, characterized in that: There are three annular gas distribution pipes (10), which are respectively set on the upper part of the crushing roller (6) and the upper and lower parts of the breaker hammer (7). The injection direction of the nitrogen nozzle (9) is tangent to the rotation direction of the crushing roller (6) and the breaker hammer (7).

7. The flame -retardant coal material crushing device according to claim 6, characterized in that: A conveying pipe (29) is fixedly connected to the surface of the discharge hopper (5). A spiral dust collector (30) is provided on one side of the main base (1). The end of the conveying pipe (29) away from the discharge hopper (5) is fixedly connected to the spiral dust collector (30). An exhaust pipe (31) is provided on the upper surface of the spiral dust collector (30). A filter screen (32) is installed at the connection between the discharge hopper (5) and the conveying pipe (29).

8. The flame -retardant coal material crushing device according to claim 7, characterized in that: The cooling jacket (11) is a hollow structure. The surfaces of the two cooling jackets (11) are symmetrically fixed with connecting pipes (33). The surface of the connecting pipe (33) of the upper cooling jacket (11) is provided with a water outlet (34), and the surface of the connecting pipe (33) of the lower cooling jacket (11) is provided with a water inlet (21).

9. The flame -retardant coal material crushing device according to claim 8, characterized in that: The lower surface of the host base (1) is symmetrically fixedly connected with support legs (101), and the surface of the support legs (101) is provided with support reinforcement parts (102). The surfaces of the support reinforcement parts (102) and the support legs (101) are both threadedly connected with locking bolts (103).

10. The flame -retardant coal material crushing device according to claim 9, characterized in that: The surface of the support reinforcement (102) is symmetrically threaded with a horizontal adjustment screw (104), and the lower surface of the support leg (101) is threaded with a horizontal adjustment screw (105). The lower end of the horizontal adjustment screw (104) is fixedly connected with a support pad (106). The surface of the horizontal adjustment screw (105) is fitted with a shock-absorbing spring (107). One end of the shock-absorbing spring (107) abuts against the support reinforcement (102), and the end of the shock-absorbing spring (107) away from the support reinforcement (102) abuts against the support pad (106).

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