An explosion-proof pneumatic auxiliary material heating and de-ironing vibrating screen device

Abstract

This invention belongs to the technical field of pneumatic vibrating screen equipment, and discloses an explosion-proof pneumatic-assisted material heating and iron removal vibrating screen device, including a screen box, a screen assembly, a pneumatic vibrator, a gas heater, and a permanent magnet iron separator. The screen assembly includes multiple parallel-arranged hollow screen bars, and the surface of the screen bars is provided with purge micro-holes. The air inlet of the pneumatic vibrator is connected to a compressed gas source, the exhaust port is connected to the inlet of the gas heater, and the outlet of the gas heater is connected to the inner cavity of the screen bars. The pneumatic vibrator drives the screen assembly to vibrate, and the exhaust gas is heated a second time by the gas heater and then sent into the inner cavity of the screen bars and sprayed out from the purge micro-holes to purge and heat the material. The permanent magnet iron separator is installed at the bottom of the material chute and works with a flap to automatically clean the iron. This invention uses pneumatic power instead of electric drive and has the advantages of explosion-proof, energy saving, remotely adjustable excitation force, anti-clogging heating, adjustable screen gap, and high-efficiency iron removal. It is suitable for screening flammable, explosive, and sticky materials.

Description

Technical Field

[0001] This invention belongs to the technical field of pneumatic vibrating screen equipment, specifically relating to an explosion-proof pneumatic auxiliary material heating and iron removal vibrating screen device. Background Technology

[0002] Vibrating screens are widely used in material grading, screening, and dewatering operations in mining, metallurgy, chemical, and building materials industries. Currently, most vibrating screens used in industrial production are electrically driven. Their working principle is as follows: the motor drives the vibrator to generate eccentric vibration, which in turn causes the entire screen box and screen mesh to perform high-frequency reciprocating motion, thereby achieving material separation according to particle size. However, this type of traditional vibrating screen has many technical shortcomings in practical applications.

[0003] First, the vibration of the entire machine results in a significant amount of energy being consumed by components not directly involved in screening, such as the screen box and support. High-frequency vibration also generates continuous impact loads on the foundation, requiring a large mass and rigidity, which significantly increases civil engineering costs. The equipment body must be made of high-strength steel to resist fatigue failure, and fasteners require special anti-loosening treatment, making the equipment heavy and expensive to manufacture.

[0004] Secondly, changing the amplitude of a traditional vibrating screen usually requires stopping the machine and disconnecting the power, then manually adjusting the angle of the vibrator's eccentric block or the counterweight mass, and restarting the machine to verify the adjustment. This process is cumbersome and cannot be adjusted in real time during operation. When the production line frequently changes the type of material or when the material's moisture content and particle size fluctuate significantly, traditional vibrating screens cannot respond quickly, and screening efficiency and effect cannot be guaranteed.

[0005] Third, wet materials with a high content of fine powder easily adhere to the surface of the screen or screen bars, forming a "screen clogging" phenomenon. In severe cases, this can lead to complete screen blockage, making screening impossible. Existing equipment does not have built-in heating or drying functions, and can only passively alleviate the problem by replacing screens with different aperture sizes or materials, significantly reducing equipment efficiency.

[0006] Fourth, under high-frequency vibration conditions, the insulation of the motor and electrical circuits of electrically driven vibrating screens is prone to damage, posing a risk of leakage or electric sparks. In humid environments, dust explosion-prone areas, or chemical production sites, the use of such equipment is strictly limited or even prohibited. Furthermore, the operating noise of traditional vibrating screens typically exceeds 90 dB, causing long-term damage to the hearing health of on-site operators.

[0007] Fifth, iron objects such as bolts, welding slag, and iron ore fragments mixed in the material can not only damage downstream equipment but also affect product quality. Traditional vibrating screens do not have an inherent iron removal function and require an additional iron remover. Moreover, the iron remover is usually installed on the conveyor belt, resulting in low adsorption efficiency and inconvenient cleaning.

[0008] Sixth, the existing screens can only screen materials within a specific particle size range. When changing product specifications, the screens must be replaced, resulting in a high rate of equipment idleness, a wide variety of spare parts, and increased operating costs.

[0009] In summary, there is an urgent need for a new type of vibrating screen device that is driven by safe energy, has remotely adjustable excitation force, has material heating and drying and anti-clogging functions, can efficiently remove iron, has adjustable screen gaps and low noise. Summary of the Invention

[0010] The purpose of this invention is to provide an explosion-proof pneumatically assisted material heating and iron removal vibrating screen device to solve the problems mentioned in the background art.

[0011] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An explosion-proof pneumatically assisted material heating and iron removal vibrating screen device includes a screen box, a screen assembly disposed within the screen box, and a power source for driving the screen assembly to vibrate. It also includes a gas heater and a permanent magnet iron separator disposed at the material discharge port of the screen box. The power source is a pneumatic vibrator, whose inlet is connected to a compressed gas source, and whose exhaust port is connected to the inlet of the gas heater via a first gas pipeline. The screen assembly includes multiple parallel screen bars, each screen bar being a hollow tube with multiple purge micro-holes communicating with its inner cavity distributed on its surface. The inner cavity of the screen bar is connected to the outlet of the gas heater via a second gas pipeline. The pneumatic vibrator drives the screen assembly to vibrate. Simultaneously, the gas discharged from the pneumatic vibrator is heated by the gas heater and then sent into the inner cavity of the screen bar, and ejected from the purge micro-holes to purge and heat the material during the screening process.

[0012] The sieve rods include large-diameter sieve rods and small-diameter sieve rods; along the width direction of the sieve, several large-diameter sieve rods and small-diameter sieve rods are arranged side by side to form a group, and multiple groups are arranged in sequence. Adjacent groups are separated by sieve rod fixing plates and the spacing is controlled to form an uneven sieve surface.

[0013] The screen assembly also includes a spacing adjustment mechanism, which includes a spacing partition plate disposed between adjacent screen rods, a slide rail seat, and a limiting wing plate. The slide rail seat is slidably disposed on the screen rod fixing plate, and the limiting wing plate is disposed on the slide rail seat to limit the screen rod. The gap between adjacent screen rods can be adjusted by replacing the spacing partition plate of different thicknesses or adjusting the position of the slide rail seat on the screen rod fixing plate.

[0014] The pneumatic vibrator is equipped with a pressure regulating valve on the input gas pipeline for remote or on-site adjustment of the input gas pressure, thereby steplessly changing the excitation force of the pneumatic vibrator; the gas heater is equipped with a temperature controller for setting and adjusting the temperature of the heated gas according to the material characteristics.

[0015] The material discharge chute has a bin-like structure, with a hinged flap at the bottom of its front end. The flap is driven to rotate downwards and open by a pneumatic telescopic rod. The permanent magnet separator is fixedly installed at the bottom of the material discharge chute and located behind the flap. After the flap is opened, it forms an iron discharge port. An auxiliary vibrating pneumatic unit is provided on the side of the permanent magnet separator.

[0016] The screen assembly is installed inside the screen box via an upper spring connecting device and a lower spring connecting device; the upper spring connecting device includes an upper pressure plate, a middle pressure plate, a lower pressure plate, connecting bolts, and a shock-absorbing spring; the pneumatic vibrator is fixedly installed on the upper pressure plate; the upper part of the screen frame of the screen assembly is bolted to the upper pressure plate, and the lower part is bolted to the upper connecting pressure plate of the lower spring connecting device; the shock-absorbing spring is sleeved on the connecting bolts to isolate vibration.

[0017] In the upper spring connecting device, spring limiting rings are provided on the lower surface of the upper pressure plate, the upper and lower surfaces of the middle pressure plate, and the upper surface of the lower pressure plate; the spring limiting rings are two arc-shaped plates symmetrically arranged along the axis of the connecting bolt, with an opening between the two arc-shaped plates to discharge compressed air when the pressure plates move relative to each other.

[0018] The compressed gas source and gas heater are both installed on the mounting column located between the front column and the rear column; a front extension plate is provided inside the screen box below the screen assembly, and the front end of the screen box is an open structure corresponding to the end of the front extension plate, so that the screen material falls directly to the outside from the end of the front extension plate; a discharge port is provided at the bottom of the screen box for discharging the screen material.

[0019] The screen frame is provided with mounting holes at both the upper and lower parts, and the screen rod is provided with connecting channels at both the upper and lower ends, so that heating gas can enter the inner cavity of the screen rod simultaneously from both ends.

[0020] The upper and lower spring connecting devices have the same structure, each including an upper pressure plate, a middle pressure plate, a lower pressure plate, and a pneumatic vibrator; the upper and lower pneumatic vibrators are independently controlled to achieve synchronous, alternating, or different frequency combinations of vibration modes.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1) This invention uses compressed air or nitrogen as the driving energy source. The pneumatic vibrator itself does not generate electric sparks, the control power supply uses a safe extra-low voltage of 24V, and the gas heater adopts an explosion-proof structure. The entire machine can operate safely in flammable and explosive environments such as humid, dusty, and chemical production environments, fundamentally eliminating the safety hazards of insulation damage and electrical sparking caused by high-frequency vibration in traditional electrically driven vibrating screens. At the same time, the operating noise of the pneumatic vibrator is much lower than that of traditional electric vibrators, and a silencer can be added to the exhaust port or the first gas pipeline to further reduce noise, effectively improving the hearing protection conditions for on-site workers.

[0022] 2) The exhaust gas discharged after the pneumatic vibrator performs its work in this invention is not directly emitted, but is introduced into a gas heater through a pipeline for secondary heating, and then sent into the inner cavity of the hollow screen bar and ejected at high speed from the purging micro-holes for heating, drying and purging to prevent clogging of materials. Furthermore, by utilizing the residual pressure and waste heat in the exhaust gas, multiple functions are integrated under the premise of a slight increase in heating energy consumption, which significantly improves energy utilization efficiency.

[0023] 3) This invention, through its shock-absorbing springs and multi-layer pressure plate structure, ensures that the vibration force generated by the pneumatic vibrator acts only on the screen rod assembly, while the screen box and foundation are essentially not subjected to high-frequency vibration. It features a small vibrating mass, low energy consumption, and no special requirements for the foundation, significantly reducing equipment manufacturing costs and installation and maintenance expenses.

[0024] 4) By adjusting the gas pressure input to the pneumatic vibrator, the present invention can change the magnitude of the excitation force in real time without stopping the machine or cutting off the power supply. It can flexibly match dry and wet materials as well as light and heavy materials, solving the problem that traditional vibrating screens need to stop the machine to adjust the eccentric block and have a limited adjustment range.

[0025] 5) This invention sets up purge micropores on the surface of the hollow screen bar. High-temperature gas, which has been heated twice, is ejected at high speed from the micropores to continuously dry the material on the screen surface and blow away the fine wet powder adhering to the surface of the screen bar. This fundamentally prevents material blockage and screen clogging, and significantly improves screening efficiency and processing capacity.

[0026] 6) This invention uses two specifications of screen bars, large and small diameter, arranged in a specific pattern along the width of the screen surface to form an uneven screening surface. By changing the spacing plates of different thicknesses or adjusting the position of the slide rail seats, the gap between adjacent screen bars can be adjusted steplessly or in stages. One set of equipment can adapt to materials of various particle sizes and shapes, eliminating the need for frequent screen replacements and greatly improving the equipment's versatility and production efficiency.

[0027] 7) This invention utilizes the dispersed state of the material during its free fall to achieve efficient adsorption by fixing a permanent magnet separator to the bottom of the material chute. During cleaning, a pneumatic telescopic rod drives the hinged flap to rotate downwards and open, forming an iron discharge port. A pneumatic vibration unit then agitates the separator, causing the adsorbed iron to detach and be discharged automatically. The entire process requires no manual intervention, is safe and reliable, and boasts an iron removal efficiency far exceeding that of traditional belt-type separators.

[0028] 8) The present invention adopts a modular design, and the screen bars can be disassembled and replaced individually, resulting in low maintenance costs. It also has multiple advantages such as explosion-proof, energy saving, adjustable excitation force, heating and anti-clogging, adjustable screen gap, high-efficiency iron removal, and low noise. It is a major improvement over the traditional electric-driven vibrating screen and has broad prospects for industrial application. Attached Figure Description

[0029] Figure 1 This is a front structural diagram of Embodiment 1 of the present invention.

[0030] Figure 2 This is a schematic diagram of the back structure of Embodiment 1 of the present invention.

[0031] Figure 3 This is a cross-sectional structural diagram of Embodiment 1 of the present invention.

[0032] Figure 4 This is a schematic diagram of the screen assembly in Embodiment 1 of the present invention.

[0033] Figure 5 This is a schematic diagram of the screen frame structure in Embodiment 1 of the present invention.

[0034] Figure 6 This is a schematic diagram of the structure of the sieve bar in Embodiment 1 of the present invention.

[0035] Figure 7 This is Embodiment 1 of the present invention. Figure 6 A schematic diagram of the structure at point B.

[0036] Figure 8 This is a front structural diagram of the upper spring connecting device in Embodiment 1 of the present invention.

[0037] Figure 9 This is a schematic diagram of the bottom structure of the upper spring connecting device in Embodiment 1 of the present invention.

[0038] Figure 10 This is a schematic diagram of the upper pressure plate in Embodiment 1 of the present invention.

[0039] Figure 11 This is a schematic diagram of the front structure of the intermediate pressure plate in Embodiment 1 of the present invention.

[0040] Figure 12This is a schematic diagram of the bottom structure of the intermediate pressure plate in Embodiment 1 of the present invention.

[0041] Figure 13 This is a schematic diagram of the lower pressure plate in Embodiment 1 of the present invention.

[0042] Figure 14 This is a front structural diagram of the lower spring connecting device in Embodiment 1 of the present invention.

[0043] Figure 15 This is a schematic diagram of the bottom structure of the lower spring connecting device in Embodiment 1 of the present invention.

[0044] Figure 16 This is Embodiment 1 of the present invention. Figure 3 A schematic diagram of the structure at point A in the middle.

[0045] Figure 17 This is Embodiment 1 of the present invention. Figure 3 A schematic diagram of the structure at point C.

[0046] Figure 18 This is Embodiment 1 of the present invention. Figure 3 A schematic diagram of the structure at point D.

[0047] Figure 19 This is a cross-sectional structural diagram of Embodiment 2 of the present invention.

[0048] Attached Figures and Their Names: 1. Screen Box; 2. Material Chute; 3. Flip Plate Hinge; 4. Screen Rod; 5. Screen Assembly; 6. Front Extension Plate; 7. Bottom Frame; 8. Front Column; 9. Mounting Column; 10. Compressed Gas Source; 11. Rear Column; 12. Fixed Base; 13. Auxiliary Vibration Pneumatic Unit; 14. Permanent Magnet Separator; 15. Pipe Connection Port; 16. Lower Spring Connection Device; 17. Upper Spring Connection Device; 18. Screen Pressure Plate; 19. Gas Pipe; 20. Screen Rod Fixing Horizontal Plate; 21. Fastening Bolt; 22. Pressure Shim; 23. Slide Rail Seat; 24. Limiting Wing Plate; 25. Discharge Port 25. Connecting channel; 26. Welding base plate; 401. Blowing micro-hole; 402. Large diameter screen rod; 403. Small diameter screen rod; 404. Mounting base; 405. Push plate; 406. Spacing partition; 407. Screen frame; 501. Mounting groove; 502. Mounting hole; 503. Upper connecting pressure plate; 1601. Lower connecting pressure plate; 1602. Upper pressure plate; 1701. Middle pressure plate; 1702. Lower pressure plate; 1703. Pneumatic vibrator; 1704. Connecting bolt; 1705. Shock-absorbing spring; 1706. Spring limit ring; 1707. Through hole; 1708. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0051] Example 1 like Figures 1 to 18 As shown, this embodiment provides an explosion-proof pneumatically assisted material heating and iron removal vibrating screen device, including a screen box 1, a screen assembly 5 disposed within the screen box 1, and a power source for driving the screen assembly 5 to vibrate. The screen box 1 is integrally mounted on a bottom frame 7. A front column 8 and a rear column 11 are respectively provided at the front and rear ends of the bottom frame 7. A compressed gas source 10 and a gas heater are installed on a mounting column 9 located between the front column 8 and the rear column 11. The specific model of the gas heater can be a commercially available explosion-proof air heater selected according to the required heating power and explosion-proof rating. The top of the screen box 1 is provided with a material chute 2, the bottom with a discharge port 25, and several pipe connection ports 15 are provided on the side walls.

[0052] The screen assembly 5 includes a screen frame 501 and multiple screen rods 4 arranged parallel to each other in the screen frame 501. Each screen rod 4 is hollow and tubular, with multiple purge micropores 402 communicating with its inner cavity distributed along its length. The screen rods 4 include two specifications: large-diameter screen rods 403 and small-diameter screen rods 404. Along the width direction of the screen, several large-diameter screen rods 403 and small-diameter screen rods 404 are arranged side by side to form a group. Multiple groups are arranged sequentially, and adjacent groups are separated by screen rod fixing plates 20 to control the spacing, forming an uneven screening surface. Each group of screen rods consists of two small-diameter screen rods 404, two large-diameter screen rods 403, and two small-diameter screen rods 404 arranged side by side along the width direction. This arrangement pattern facilitates the tumbling effect of materials on the screen surface and reduces the clogging of flat materials.

[0053] The lower part of the screen frame 501 is provided with mounting holes 503, the inner diameter of which is adapted to the gas pipe 19. The lower end of the screen rod 4 is provided with a connecting channel 26, and the inner cavity of the screen rod 4 is connected to the gas pipe 19 through the connecting channel 26. The connecting channel 26 is a rectangular block with an internal gas guiding channel. Its top and bottom surfaces are both arc-shaped surfaces, and both ends are rounded to form a rectangular block configuration with arc-shaped ends. The arc-shaped surface at the top of the connecting channel 26 matches the radius of the outer cylindrical surface of the screen rod 4, and is fixed to the end of the screen rod 4 by continuous circumferential welding, so that the gas guiding channel opened inside the block is sealed and connected to the inner cavity of the screen rod 4. The arc-shaped surface at the bottom of the connecting channel 26 serves as a plug-in end, and an annular sealing groove is machined on its outer circumference, in which a high-temperature resistant fluororubber O-ring is installed. The gas pipe 19 is arranged horizontally along the width direction of the screen assembly 5, and its cross-section is preferably circular. On the upper surface of the gas pipeline 19, several connecting hole seats are arranged in rows along the length direction at adjustable intervals of the sieve bars 4. Each connecting hole seat is a straight cylindrical section with internal threads or a snap-fit, protruding upwards, and has a connecting hole inside that communicates with the inner cavity of the gas pipeline 19. Each connecting hole seat is equipped with a removable sealing cap, which is quickly installed and removed from the connecting hole seat and airtightly sealed by means of threads, snaps, or clamps. A pressure-resistant sealing gasket is provided on the inner side of the sealing cap to ensure that the unused connecting hole is in a normally closed sealed state. After the sieve bars 4 are adjusted to the target position according to the selected interval through the slide rail seat 23 and the interval partition 407, the operator first removes the removable sealing cap on the connecting hole seat corresponding to the position, and then inserts the bottom arc-shaped plug of the connecting channel 26 welded to the end of the sieve bar 4 vertically downwards into the connecting hole seat until the annular sealing ring enters the sealing surface of the inner wall of the hole seat, forming a socket-type self-sealing connection. To ensure axial fixation after insertion, a spring clip or quick-lock clamp can be added to the side of the connecting hole seat to prevent loosening under vibration conditions. Unused connecting holes remain sealed with the sealing cap to maintain the overall airtightness of the gas pipeline 19. When it is necessary to change the gap between the screen bars 4 again, simply pull the connecting channel 26 upwards, reseal the original connecting hole seat with the sealing cap, and complete the insertion in the new position according to the above steps. The entire process does not require disassembly or replacement of the gas pipeline 19, nor does it require frequent bending of the flexible hose, significantly improving the maintenance convenience and adjustment reliability of the pipeline system.

[0054] The screen component 5 further includes a spacing adjustment mechanism, which includes a spacing partition plate 407 disposed between adjacent screen bars 4, a slide rail base 23, and a limit wing plate 24. The slide rail base 23 is slidably disposed on the screen bar fixing cross plate 20. A "convex"-shaped groove body adapted to the slide rail base 23 is provided on the cross section of the screen bar fixing cross plate 20. A number of opening grooves for removing the slide rail base 23 are also provided on the screen bar fixing cross plate 20. The limit wing plate 24 is disposed on the slide rail base 23 for limiting the screen bar 4. By replacing the spacing partition plates 407 with different thicknesses or adjusting the position of the slide rail base 23 on the screen bar fixing cross plate 20, the adjustment of the gap between adjacent screen bars 4 can be achieved. A pressing gasket 22 is also provided between the slide rail base 23 and the screen bar fixing cross plate 20. The threaded end of the fastening bolt 21 penetrates through the screen bar fixing cross plate 20 and abuts against the pressing gasket 22, and the pressing gasket 22 is pushed to fix the slide rail base 23 on the screen bar fixing cross plate 20. Both ends of the screen bar 4 are fixed to the welding bottom plate 401 through the mounting seats 405, and the mounting seats 405 are fixed on the welding bottom plate 401 through the push plates 406 and the built-in screws to achieve fastening. A "convex"-shaped groove body adapted to the mounting seats 405 and the spacing partition plates 407 is provided on the welding bottom plate 401, and the spacing partition plate 407 is located between two adjacent screen bars 4. Mounting grooves 502 are provided at both ends of the screen frame 501 close to the screen bars 4. The mounting grooves 502 are adapted to the structure of the welding bottom plate 401. The screen pressing plate 18 fastens the assembled multiple groups of screen bars 4 in the mounting grooves 502 of the screen frame 501. Among them, both the pressing gasket 22 and the push plate 406 are polyurethane plates.

[0055] The power source is a pneumatic vibrator 1704, whose air inlet is connected to a compressed gas source 10, and whose exhaust port is connected to the inlet of a gas heater through a first gas pipeline. The inner cavity of the screen bar 4 is connected to the outlet of the gas heater through a second gas pipeline. A pneumatic pressure regulating valve is provided on the input gas pipeline of the pneumatic vibrator 1704 for remotely or on-site adjusting the input gas pressure, thereby infinitely changing the excitation force of the pneumatic vibrator 1704. A temperature controller is provided on the gas heater for setting and adjusting the temperature of the heated gas according to the material characteristics. The setting range of the temperature controller should be at least 50°C lower than the ignition point or softening point of the material to ensure safety.

[0056] The screen assembly 5 is installed inside the screen box 1 via an upper spring connecting device 17 and a lower spring connecting device 16. The upper spring connecting device 17 includes an upper pressure plate 1701, a middle pressure plate 1702, a lower pressure plate 1703, connecting bolts 1705, and a shock-absorbing spring 1706. A pneumatic vibrator 1704 is fixedly installed on the upper pressure plate 1701 by bolts. The upper part of the screen frame 501 of the screen assembly 5 is bolted to the upper pressure plate 1701, and the lower part is bolted to the upper connecting pressure plate 1601 of the lower spring connecting device 16. A connecting bolt 1705 passes through the intermediate pressure plate 1702 and is used to connect the upper pressure plate 1701 and the lower pressure plate 1703. A damping spring 1706 is sleeved on the connecting bolt 1705 between the upper pressure plate 1701 and the intermediate pressure plate 1702, and between the intermediate pressure plate 1702 and the lower pressure plate 1703. It is used to isolate vibration, so that the vibration force generated by the pneumatic vibrator 1704 mainly acts on the screen assembly 5, while the screen box 1 and the foundation are basically unaffected by high-frequency vibration. The lower spring connecting device 16 includes an upper connecting pressure plate 1601 and a lower connecting pressure plate 1602. A connecting bolt 1705 is also provided in the middle of the upper connecting pressure plate 1601. The connecting bolt 1705 is used to connect the upper connecting pressure plate 1601 and the lower connecting pressure plate 1602, and a damping spring 1706 is sleeved on the connecting bolt 1705 between the upper connecting pressure plate 1601 and the lower connecting pressure plate 1602. In the upper spring connecting device 17 and the lower spring connecting device 16, spring limiting rings 1707 are provided on the lower surface of the upper pressure plate 1701, the upper and lower surfaces of the middle pressure plate 1702, the upper surface of the lower pressure plate 1703, the lower surface of the upper connecting pressure plate 1601, and the upper surface of the lower connecting pressure plate 1602. The spring limiting rings 1707 are two arc-shaped plates symmetrically arranged along the axis of the connecting bolts 1705, with an opening between the two arc-shaped plates to discharge compressed air when the pressure plates move relative to each other, thus avoiding the formation of air cushion damping and affecting the shock absorption effect.

[0057] During operation, the pneumatic vibrator 1704 drives the screen assembly 5 to vibrate. Simultaneously, the gas discharged from the pneumatic vibrator 1704, after being heated by a gas heater, is sent into the inner cavity of the screen rod 4 through a second gas pipeline and ejected at high speed from the purge micro-holes 402, purging and heating the material during the screening process. Compressed air or nitrogen supplied by the compressed gas source 10 first drives the pneumatic vibrator 1704. The exhaust gas, still possessing a certain pressure and temperature after completing its work, enters the gas heater for secondary heating. Then, it enters the inner cavity of the screen rod 4 through the gas pipeline 19, pipeline connection port 15, mounting hole 503 on the screen frame 501, and connecting channel 26 at the end of the screen rod 4, finally ejecting from the purge micro-holes 402. In Example 1, the gas only enters from the lower end of the screen rod 4 and ejects upwards or laterally from the purge micro-holes 402. To reduce heat transfer, thermal insulation material is wrapped around the outer wall of the gas pipeline 19.

[0058] The material discharge chute 2 has a bin-like structure, with a hinged flap 3 at its front bottom. The flap 3 is driven to rotate downwards and open via a pneumatic telescopic rod. A permanent magnet separator 14 is fixedly installed at the bottom of the material discharge chute 2, located behind the flap 3. When the flap 3 is open, it forms an iron discharge port. An auxiliary vibrating pneumatic unit 13 is located beside the permanent magnet separator 14. During normal operation, the flap 3 is in the closed position, and the permanent magnet separator 14 adsorbs iron from the falling material. When cleaning is required, feeding is stopped, the pneumatic telescopic rod drives the flap 3 to rotate downwards and open, and the auxiliary vibrating pneumatic unit 13 vibrates the permanent magnet separator 14, causing the adsorbed iron to fall off and be discharged from the open flap 3. After cleaning, the pneumatic telescopic rod resets the flap 3, and feeding resumes for continued screening.

[0059] Inside the screen box 1, below the screen assembly 5, is a front extension plate 6. The front end of the screen box 1, corresponding to the end of the front extension plate 6, is open, allowing the oversize material to fall directly to the outside from the end of the front extension plate 6. A discharge port 25 at the bottom of the screen box 1 is used to discharge the undersize material. Polyurethane wear-resistant liners are installed at the connections between components and on the inner wall of the screen box 1. The liner thickness is designed according to the wear conditions to improve wear resistance and cushioning performance.

[0060] Example 2 like Figure 19 As shown, the difference between this embodiment and Embodiment 1 lies in the following two points. First, the upper and lower parts of the screen frame 501 are provided with mounting holes 503, and the upper and lower ends of the screen rod 4 are provided with connecting channels 26, allowing heating gas to enter its inner cavity simultaneously from both ends of the screen rod 4. This makes the temperature distribution along the length of the screen rod 4 more uniform, avoiding excessive temperature drop at the end due to gas ejection along the path, which is particularly suitable for screen rods 4 with larger lengths. Second, the upper spring connecting device 17 and the lower spring connecting device 16 have the same structure, both including an upper pressure plate 1701, a middle pressure plate 1702, a lower pressure plate 1703, and a pneumatic vibrator 1704. That is, a pneumatic vibrator 1704 is also installed in the lower spring connecting device 16. The upper and lower sets of pneumatic vibrators 1704 are independently controlled, and their respective input air pressure and working sequence can be adjusted by a programmable logic controller to achieve synchronous vibration, alternating vibration, or vibration modes with different frequency combinations. The remaining structure is the same as in Embodiment 1, and will not be described again here.

Claims

1. An explosion-proof pneumatically assisted material heating and iron removal vibrating screen device, comprising a screen box (1), a screen assembly (5) disposed within the screen box (1), and a power source for driving the screen assembly (5) to vibrate, characterized in that, Also includes: Gas heater; A permanent magnet separator (14) is installed at the discharge port of the screen box (1). The power source is a pneumatic vibrator (1704), whose air inlet is connected to a compressed gas source (10), and whose exhaust port is connected to the inlet of the gas heater through a first gas pipeline. The screen assembly (5) includes a plurality of parallel screen rods (4), each screen rod (4) is hollow tubular, and its surface is distributed with a plurality of purge micropores (402) communicating with its inner cavity. The inner cavity of the screen rod (4) is connected to the outlet of the gas heater through a second gas pipeline. The pneumatic vibrator (1704) drives the screen assembly (5) to vibrate. At the same time, the gas discharged from the pneumatic vibrator (1704) is heated by the gas heater and sent into the inner cavity of the screen rod (4), and sprayed out from the purging microhole (402) to purge and heat the material in the sieving process.

2. The explosion-proof pneumatically assisted material heating and iron removal vibrating screen device according to claim 1, characterized in that, The sieve rod (4) includes a large-diameter sieve rod (403) and a small-diameter sieve rod (404). Along the width direction of the sieve, several large-diameter sieve rods (403) and small-diameter sieve rods (404) are arranged side by side to form a group. Multiple groups are arranged in sequence. Adjacent groups are separated by a sieve rod fixing plate (20) and the spacing is controlled to form an uneven sieve surface.

3. The explosion-proof pneumatically assisted material heating and iron removal vibrating screen device according to claim 2, characterized in that, The screen assembly (5) also includes a spacing adjustment mechanism, which includes a spacing partition (407) disposed between adjacent screen rods (4), a slide rail seat (23), and a limiting wing plate (24); the slide rail seat (23) is slidably disposed on the screen rod fixing horizontal plate (20), and the limiting wing plate (24) is disposed on the slide rail seat (23) to limit the screen rod (4); by replacing the spacing partition (407) of different thicknesses or adjusting the position of the slide rail seat (23) on the screen rod fixing horizontal plate (20), the gap between adjacent screen rods (4) can be adjusted.

4. The explosion-proof pneumatically assisted material heating and iron removal vibrating screen device according to claim 1, characterized in that, The pneumatic vibrator (1704) is equipped with a pressure regulating valve on the input gas pipeline, which is used to remotely or on-site adjust the input gas pressure, thereby steplessly changing the excitation force of the pneumatic vibrator (1704); the gas heater is equipped with a temperature controller, which is used to set and adjust the temperature of the heated gas according to the material characteristics.

5. The explosion-proof pneumatically assisted material heating and iron removal vibrating screen device according to claim 1, characterized in that, The material discharge chute (2) has a bin structure, and a hinged flap (3) is installed at the bottom of its front end. The hinged flap (3) is driven to rotate downwards and open by a pneumatic telescopic rod. The permanent magnet separator (14) is fixedly installed at the bottom of the material discharge chute (2) and is located behind the hinged flap (3). After the hinged flap (3) is opened, it forms an iron discharge port. An auxiliary vibrating pneumatic vibration unit (13) is provided on the side of the permanent magnet separator (14).

6. The explosion-proof pneumatically assisted material heating and iron removal vibrating screen device according to claim 1, characterized in that, The screen assembly (5) is installed in the screen box (1) via an upper spring connecting device (17) and a lower spring connecting device (16). The upper spring connecting device (17) includes an upper pressure plate (1701), a middle pressure plate (1702), a lower pressure plate (1703), a connecting bolt (1705), and a shock-absorbing spring (1706). The pneumatic vibrator (1704) is fixedly installed on the upper pressure plate (1701). The upper part of the screen frame (501) of the screen assembly (5) is bolted to the upper pressure plate (1701), and the lower part is bolted to the upper connecting pressure plate (1601) of the lower spring connecting device (16). The shock-absorbing spring (1706) is sleeved on the connecting bolt (1705) to isolate vibration.

7. The explosion-proof pneumatically assisted material heating and iron removal vibrating screen device according to claim 6, characterized in that, In the upper spring connecting device (17), spring limiting rings (1707) are provided on the lower surface of the upper pressure plate (1701), the upper and lower surfaces of the middle pressure plate (1702), and the upper surface of the lower pressure plate (1703); the spring limiting rings (1707) are two arc-shaped plates symmetrically arranged along the axis of the connecting bolt (1705), with an opening between the two arc-shaped plates for discharging compressed air when the pressure plates move relative to each other.

8. The explosion-proof pneumatically assisted material heating and iron removal vibrating screen device according to claim 1, characterized in that, The compressed gas source (10) and the gas heater are both installed on the mounting column (9) located between the front column (8) and the rear column (11); the screen box (1) is provided with a front extension plate (6) located below the screen assembly (5), and the front end of the screen box (1) is open at the end of the front extension plate (6), so that the screen material falls directly to the outside from the end of the front extension plate (6); the bottom of the screen box (1) is provided with a discharge port (25) for discharging the screen material.

9. The explosion-proof pneumatically assisted material heating and iron removal vibrating screen device according to any one of claims 1 to 8, characterized in that, The upper and lower parts of the screen frame (501) are provided with mounting holes (503), and the upper and lower ends of the screen rod (4) are provided with connecting channels (26). Heating gas enters the inner cavity of the screen rod (4) from both ends simultaneously.

10. The explosion-proof pneumatically assisted material heating and iron removal vibrating screen device according to claim 9, characterized in that, The upper spring connecting device (17) and the lower spring connecting device (16) have the same structure, both including an upper pressure plate (1701), a middle pressure plate (1702), a lower pressure plate (1703) and a pneumatic vibrator (1704); the upper and lower pneumatic vibrators (1704) are independently controlled to achieve synchronous, alternating or different frequency combinations of vibration modes.

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