A positive pressure screw conveyor

Abstract

The present application relates to the technical field of conveyer, specifically disclose a kind of positive pressure screw conveyer, including cylinder and conveying screw, cylinder is hollow double-cylinder structure, two ends of cylinder are rotatably connected with two conveying screws staggered as "H" shape, two ends of each conveying screw are fixedly connected with transmission shaft, the transmission shaft of one end of conveying screw is fixedly connected with gear shaft, warning mechanism is arranged between two gear shafts, the transmission shaft of the other end of conveying screw is rotatably connected with self-aligning roller bearing and the end side wall is provided with self-lubricating assembly, and sealing assembly is arranged on the periphery of self-aligning roller bearing. By improving sealing performance and lubricating effect, the service life of screw conveyer is improved, the maintenance frequency is reduced, and vibration can be conveniently detected, to play a warning role.

Description

Technical Field

[0001] This invention relates to the field of conveyor technology, and more particularly to a positive pressure screw conveyor. Background Technology

[0002] A positive pressure screw conveyor is a continuous conveying device without flexible traction. It uses a rotating screw to push the conveyed material along a fixed casing to carry out the conveying work. The entire transmission process takes place in a sealed cylinder. There are no high-speed rotating parts during the operation of the equipment, resulting in low energy consumption and convenient maintenance.

[0003] In positive pressure screw conveyors, the drive motor is located at the head, and the screw impeller experiences significant force during material transport. Therefore, the tail bearing, located further from the drive motor, often bears greater force, leading to increased wear. During daily use, if the screw impeller is not properly sealed while mixing and conveying materials, fine materials can easily adhere to the screw shaft or even penetrate into the bearing, accelerating wear, reducing bearing life, and affecting normal material transport. External dust and particles can also easily enter the bearing, affecting lubrication and causing wear. While adding lubricating oil to the bearing can reduce wear and improve performance, this requires removing the top cover, which is inconvenient and can easily contaminate the lubricating oil with external dust. To ensure the normal operation of the positive pressure screw conveyor, vibration testing of the drive shaft is necessary to detect problems early and perform maintenance. Currently used handheld vibration testing equipment is not convenient for real-time observation, easily delaying maintenance and causing equipment damage, thus affecting production efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a positive pressure screw conveyor.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A positive pressure screw conveyor includes a cylinder and a conveying screw. The cylinder is a hollow double-cylinder structure. Two conveying screws in a "V" shape are rotatably connected to both ends of the cylinder. A drive shaft is fixedly connected to both ends of each conveying screw. A gear shaft is fixedly connected to the drive shaft at one end of the conveying screw. A warning mechanism is provided between the two gear shafts. A self-aligning roller bearing is rotatably connected to the drive shaft at the other end of the conveying screw, and a self-lubricating component is provided on the end side wall. A sealing component is provided around the self-aligning roller bearing.

[0007] The sealing assembly includes a sealing seat and an inner pressure cover. The sealing seat, which passes through the cylinder, is bolted to the outlet end of the cylinder near the self-aligning roller bearing. The inner pressure cover is screwed to the inner wall of the sealing seat inside the cylinder. The outer pressure cover is bolted to the sealing seat outside the cylinder. An oil nozzle is provided in the center of the outer pressure cover.

[0008] The warning mechanism includes a pointer and a vibration probe. Wear-resistant arc-shaped blocks are slidably connected to the opposing surfaces of the two gear shafts. A hollow mounting plate is fixedly connected between the two arc-shaped blocks. Two vibration probes are symmetrically arranged on the inner wall of the bottom of the mounting plate, which respectively abut against the two gear shafts. Two symmetrical pointers are rotatably connected to the outer wall of the mounting plate.

[0009] The self-lubricating component includes a fixed rod and a ball head. The fixed rod is fixedly connected to the center of the drive shaft near the side wall of the outer pressure cover. The ball head is fixedly installed at the bottom of the end of the fixed rod. The oil nozzle is threadedly connected to an oil nozzle interface. A sliding block is slidably connected inside the oil nozzle interface. An oil groove is opened on the bottom inner wall of the oil nozzle interface.

[0010] Preferably, a motor reducer is provided on one side of the cylinder, and a gearbox is provided between the motor reducer and the cylinder. Two meshing transmission gears are rotatably connected in the gearbox. One of the transmission gears is fixedly connected to the output shaft of the motor reducer, and a gear shaft is fixedly connected to the side of the two transmission gears away from the motor reducer.

[0011] Preferably, the cylinder has a discharge port on the side closer to the motor reducer and a feed port on the side farther away from the motor reducer.

[0012] Preferably, a wear-resistant sleeve is fitted between the sealing seat and the drive shaft, and a copper sleeve is fitted on the outer wall of the wear-resistant sleeve near the inner pressure cover. Two Y-shaped sealing rings are provided between the outer wall of the wear-resistant sleeve and the sealing seat, with the Y-shaped sealing rings located away from the inner pressure cover.

[0013] Preferably, a sealing outer sleeve is bolted to the inner wall of the cylinder near the self-aligning roller bearing, and a sealing inner sleeve is snapped into the end of the sealing outer sleeve. The sealing inner sleeve is screwed to the bushing on the outer wall of the drive shaft.

[0014] Preferably, a shaft elastic retaining ring is provided between the outer wall of the self-aligning roller bearing and the drive shaft, and a liquid level sensor is fixedly installed on the bottom side of the outer pressure cover near the shaft elastic retaining ring.

[0015] Preferably, a lubricating oil tank is fixedly connected to the end of the oil nozzle interface. The lubricating oil tank contains lubricating oil. An air hole and an oil filling port are opened on the top of the lubricating oil tank. A truss is fixedly installed on the inner wall of the top of the lubricating oil tank. An electric cylinder is fixedly installed at the top of the truss. A sealing plug is fixedly installed at the top of the telescopic end of the electric cylinder. The sealing plug is adapted to the air hole. The electric cylinder is electrically connected to the liquid level sensor.

[0016] Preferably, the sliding block is a cylindrical structure with a wedge-shaped block at the top, and the oil groove is located below the sliding block with a length less than the bottom length of the sliding block.

[0017] Preferably, the bottom shaft of the pointer passes through the mounting plate and a magnet is fixedly connected to the end of the shaft. A piezoelectric sensor is fixedly connected to the end of the vibration probe. The side wall of the piezoelectric sensor faces the magnet. Two back plates are symmetrically arranged on the top of the mounting plate near the pointer. The side wall of the back plate is divided into a scale. Microswitches are arranged on the top of both sides of the scale. A warning light is arranged at the center of the top of the back plate. The warning light on each back plate is electrically connected to the two microswitches on the current back plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This invention features a conveying screw system. The positive pressure screw conveyor has a double-screw structure, with a left-handed screw shaft and a right-handed screw shaft arranged side by side. The screw blades, which are fixedly connected to the left-handed and right-handed screw shafts respectively, have the same screw size and are staggered and coupled in a "V" shape. Two meshing transmission gears cause the two conveying screws to rotate in opposite directions. This ensures that the material is subjected to the axial force of the screw blades of the left-handed or right-handed screw shaft, as well as the axial force of the screw blades of the right-handed or left-handed screw shaft. This ensures thorough mixing while preventing the material from sticking to the screw shaft.

[0020] This invention features a sealing assembly where the sealing seat and cylinder are bolted together. The sealing seat has an internal cavity with a sealing ring, forming an oil chamber filled with lubricating oil. Even in dusty environments, dust entering the sealing seat is adhered to the lubricating oil and is less likely to leak out, thus preventing dust from causing sealing assembly failure. This increases the sealing assembly's lifespan and replacement cycle, reducing production costs while meeting the lubrication and sealing requirements of the bearings in positive pressure screw conveyors. It also prevents wear on bearing components caused by particulate matter during bearing operation, further extending bearing life. The entire sealing structure enhances the sealing protection of the tail bearing, delaying wear on vulnerable parts such as bearing balls and cages, thereby reducing the number of maintenance operations due to bearing damage and improving production efficiency. The entire sealing structure is simple and reliable, maximizing the prevention of fine particles from entering the bearing. Installation and maintenance are easy, meeting the needs of various operating conditions.

[0021] This invention, by setting up a warning mechanism, can visually amplify the vibration of transmission components to a visible level through the transmission of the rotating shaft and the magnification of the pointer. Personnel can judge the vibration of the gear shaft and the wear of the transmission components according to the scale, without the need to use a handheld vibration meter. The warning light can remind staff to perform maintenance and replacement, preventing greater damage to the equipment. Generally, personnel can make judgments based on actual usage experience, rather than waiting for an alarm to sound before maintenance. The warning light mainly serves as a reminder to prevent omissions due to negligence.

[0022] This invention features a self-lubricating mechanism that operates continuously as the drive shaft rotates. During operation, the ball head pushes the sliding block along the grease nipple interface as it rotates one revolution. Each time the sliding block is pushed open by the ball head, the oil groove is exposed. When the level sensor monitors the oil level and it is within a safe range, no lubricating oil needs to be added. At this time, the extension end of the electric cylinder extends and inserts the sealing plug into the air hole, ensuring the airtightness of the lubricating oil tank. Under air pressure, the lubricating oil cannot flow down the oil groove during the sliding of the sliding block. When the lubricating oil level reaches the warning line, the level sensor transmits a signal to the controller, which controls the electric cylinder to retract, causing the sealing plug to disengage from the air hole. At this point, the lubricating oil tank is connected to the outside air, and the lubricating oil can flow smoothly into the grease nipple through the oil groove to replenish the lubricating oil for the self-aligning roller bearing. The self-lubricating mechanism automatically determines the oil level and can automatically add lubricating oil accordingly, eliminating the need for frequent disassembly and reassembly of the cover plate. The intermediate bearing can be lubricated without disassembling the trough and cover plate, and it does not affect the sealing performance of the equipment, effectively protecting the safety of components and improving the performance. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of a positive pressure screw conveyor proposed in this invention;

[0024] Figure 2 This is a side view of a positive pressure screw conveyor proposed in this invention;

[0025] Figure 3 This is a top view of a positive pressure screw conveyor proposed in this invention;

[0026] Figure 4 This is a side sectional view of a positive pressure screw conveyor proposed in this invention;

[0027] Figure 5 This is a left view of a positive pressure screw conveyor proposed in this invention;

[0028] Figure 6 This is a schematic diagram of the sealing assembly structure of a positive pressure screw conveyor proposed in this invention;

[0029] Figure 7This is a schematic diagram of the self-lubricating component structure of a positive pressure screw conveyor proposed in this invention;

[0030] Figure 8 This is a schematic diagram of the oil nozzle interface structure of a positive pressure screw conveyor proposed in this invention;

[0031] Figure 9 This is a schematic diagram showing the positional relationship between the sliding block and the ball head of a positive pressure screw conveyor proposed in this invention;

[0032] Figure 10 This is a schematic diagram showing the connection state between the gear shaft and the warning mechanism of a positive pressure screw conveyor proposed in this invention;

[0033] Figure 11 This is a schematic diagram of the warning mechanism structure of a positive pressure screw conveyor proposed in this invention;

[0034] Figure 12 This is a three-dimensional schematic diagram of the warning mechanism of a positive pressure screw conveyor proposed in this invention.

[0035] In the diagram: 1. Motor reducer; 2. Gearbox; 201. Gear shaft; 3. Discharge port; 4. Cylinder; 5. Conveying screw; 501. Drive shaft; 6. Inlet; 7. Self-aligning roller bearing; 8. Outer pressure cover; 801. Oil nozzle; 802. Liquid level sensor; 9. Sealing assembly; 10. Sealing seat; 11. Sealing outer sleeve; 12. Inner pressure cover; 13. Sealing inner sleeve; 14. Copper sleeve; 15. Wear-resistant sleeve; 16. Y-type sealing ring; 17. Shaft elastic 18. Retaining ring; 19. Lubricating oil tank; 10. Oil nozzle interface; 11. Oil trough; 12. Electric cylinder; 13. Sealing plug; 14. Air hole; 15. Self-lubricating component; 26. Sliding block; 27. Fixing rod; 28. Ball head; 29. ​​Warning mechanism; 20. Arc block; 21. Mounting plate; 22. Back plate; 23. Micro switch; 24. Warning light; 25. Pointer; 26. Magnet; 27. Vibration probe; 28. Piezoelectric sensor. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] Reference Figure 1-12A positive pressure screw conveyor includes a cylinder 4 and a conveying screw 5. The cylinder 4 is a hollow double cylinder structure. Two conveying screws 5 are rotatably connected to both ends of the cylinder 4 in a "V" shape. A drive shaft 501 is fixedly connected to both ends of each conveying screw 5. A gear shaft 201 is fixedly connected to the drive shaft 501 at one end of the conveying screw 5. A warning mechanism 22 is provided between the two gear shafts 201. A self-aligning roller bearing 7 is rotatably connected to the drive shaft 501 at the other end of the conveying screw 5, and a self-lubricating component 19 is provided on the end side wall. A sealing component 9 is provided around the self-aligning roller bearing 7.

[0038] The sealing assembly 9 includes a sealing seat 10 and an inner pressure cover 12. The sealing seat 10, which passes through the cylinder 4, is bolted to the end outlet of the cylinder 4 near the self-aligning roller bearing 7. The inner pressure cover 12 is screwed to the inner wall of the sealing seat 10 inside the cylinder 4. The outer pressure cover 8 is bolted to the outer end of the sealing seat 10 outside the cylinder 4. An oil nozzle 801 is opened in the center of the outer pressure cover 8.

[0039] The warning mechanism 22 includes a pointer 25 and a vibration probe 27. Wear-resistant arc-shaped blocks 23 are slidably connected to the opposing surfaces of the two gear shafts 201. A hollow mounting plate 24 is fixedly connected between the two arc-shaped blocks 23. Two vibration probes 27 are symmetrically arranged on the bottom inner wall of the mounting plate 24, which respectively abut against the two gear shafts 201. Two symmetrical pointers 25 are rotatably connected to the outer wall of the mounting plate 24.

[0040] The self-lubricating component 19 includes a fixed rod 21 and a ball head 211. The fixed rod 21 is fixedly connected to the center of the side wall of the outer pressure cover 8 near the drive shaft 501. The ball head 211 is fixedly installed at the bottom of the fixed rod 21. The oil nozzle 801 is threadedly connected to the oil nozzle interface 181. A sliding block 20 is slidably connected inside the oil nozzle interface 181. An oil groove 182 is opened on the bottom inner wall of the oil nozzle interface 181. Considering that the drive shaft 501 needs frequent lubrication, but it is inconvenient to frequently disassemble and assemble the cover plate, a self-lubricating component 19 with good sealing performance is specially designed. It can lubricate the intermediate bearing without disassembling the material trough and the cover plate, and will not affect the sealing performance of the equipment. The sealing component 9 prevents dust and other particles from entering the bearing, avoiding wear of bearing parts by particles during bearing operation, thereby extending the service life of the bearing. The warning mechanism 22 can visually amplify the vibration of the transmission component to a visible level. Personnel can judge the vibration of the gear shaft 201 and the wear of the transmission component according to the scale, without the need to use a handheld vibration meter for measurement.

[0041] As a technical optimization of the present invention, a motor reducer 1 is provided on one side of the cylinder 4, and a gearbox 2 is provided between the motor reducer 1 and the cylinder 4. Two meshing transmission gears are rotatably connected in the gearbox 2. One of the transmission gears is fixedly connected to the output shaft of the motor reducer 1, and the gear shaft 201 is fixedly connected to the side of the two transmission gears away from the motor reducer 1. The motor reducer 1 serves as the power source for the conveying screw 5, driving the transmission gears to rotate. The two meshing transmission gears cause the two conveying screws 5 to rotate in opposite directions, so that the material is subjected to the axial component force of the left-hand or right-hand screw shaft and the spiral blades of the right-hand or left-hand screw shaft, while also being subjected to the axial component force of the right-hand or left-hand screw shaft and the spiral blades of the right-hand or left-hand screw shaft. This ensures thorough mixing while preventing the material from sticking to the screw shaft.

[0042] As a technical optimization of the present invention, a discharge port 3 is provided on the side of the cylinder 4 closest to the motor reducer 1, and a feed port 6 is provided on the side of the cylinder 4 away from the motor reducer 1. After the material enters the cylinder 4 through the feed port 6, it is conveyed by the conveying screw 5 to the discharge port 3 and then output to the designated position.

[0043] As an optimized technical solution of the present invention, a wear-resistant sleeve 15 is fitted between the sealing seat 10 and the drive shaft 501. A copper sleeve 14 is fitted onto the outer wall of the wear-resistant sleeve 15 near the inner pressure cover 12. Two Y-shaped sealing rings 16 are provided between the outer wall of the wear-resistant sleeve 15 and the sealing seat 10, with the Y-shaped sealing rings 16 located away from the inner pressure cover 12. The wear-resistant sleeve 15 is used to isolate the sealing seat 10 from the drive shaft 501. Because the wear-resistant sleeve 15 has better wear resistance, it can prevent the sealing seat 10 from directly rubbing against the drive shaft 501 and causing wear on the drive shaft 501. The inner wall of the copper sleeve 14 has an oil passage to ensure the flow of lubricating oil, so that the drive shaft 501 and the seal are always lubricated.

[0044] As a technical optimization of the present invention, a sealing outer sleeve 11 is bolted to the inner wall of the cylinder 4 near the self-aligning roller bearing 7. A sealing inner sleeve 13 is snapped into the end of the sealing outer sleeve 11, and the sealing inner sleeve 13 is screwed to the bushing on the outer wall of the drive shaft 501. The drive shaft 501 is directly connected to the conveying screw 5. The material conveyed by the conveying screw 5 is mostly large particles. These large particles are enclosed in the cylinder 4 by the sealing outer sleeve 11 and the sealing inner sleeve 13 and cannot approach the drive shaft 501. This effectively protects the drive shaft 501 from material wear, extends the service life of the drive shaft 501, reduces the number of maintenance times, and ensures the normal transportation of materials.

[0045] As a technical optimization of the present invention, a shaft elastic retaining ring 17 is provided between the outer wall of the self-aligning roller bearing 7 and the drive shaft 501, and a liquid level sensor 802 is fixedly installed on the bottom side of the outer pressure cover 8 near the shaft elastic retaining ring 17. The shaft elastic retaining ring 17 is used to seal the tail end of the drive shaft 501 to prevent external dust and particles from entering the outer wall of the drive shaft 501 through the outer pressure cover 8 and causing wear.

[0046] As a technical optimization of the present invention, a lubricating oil tank 18 is fixedly connected to the end of the oil nozzle interface 181. The lubricating oil tank 18 contains lubricating oil. The top of the lubricating oil tank 18 has an air hole 185 and an oil filling port. A truss is fixedly installed on the inner wall of the top of the lubricating oil tank 18. An electric cylinder 183 is fixedly installed at the top of the truss. A sealing plug 184 is fixedly installed at the top of the telescopic end of the electric cylinder 183. The sealing plug 184 is adapted to the air hole 185. The electric cylinder 183 is electrically connected to the liquid level sensor 802. The lubricating oil level of the self-aligning roller bearing 7 is monitored by the level sensor 802. When the oil level is within the safe range, no lubricating oil needs to be added. At this time, the telescopic end of the electric cylinder 183 extends and inserts the sealing plug 184 into the air hole 185 to ensure the airtightness of the lubricating oil tank 18. Under the action of air pressure, the lubricating oil cannot flow down through the oil groove 182 during the sliding process of the sliding block 20. Only when the lubricating oil level reaches the warning line will the level sensor 802 transmit a signal to the controller. The controller controls the electric cylinder 183 to retract, so that the sealing plug 184 is removed from the air hole 185. At this time, the lubricating oil tank 18 is connected to the outside air, and the lubricating oil can flow smoothly into the oil nozzle 801 through the oil groove 182 to replenish the lubricating oil of the self-aligning roller bearing 7.

[0047] As a technical optimization of the present invention, the sliding block 20 is a cylindrical structure with a wedge-shaped block at the top. The oil groove 182 is located below the sliding block 20, and the length of the oil groove 182 is less than the length of the bottom of the sliding block 20. The tail of the sliding block 20 is elastically connected to the oil nozzle interface 181, ensuring that the sliding block 20 can automatically reset after being squeezed and slid by the ball head 211 each time. The oil groove 182 is used to guide the lubricating oil in the lubricating oil tank 18 to the oil nozzle 801, and can be repeatedly blocked and opened by the sliding block 20 as it slides, so that the lubricating oil can be automatically replenished as the drive shaft 501 rotates during use.

[0048] As a technical optimization of the present invention, the bottom shaft of the pointer 25 passes through the mounting plate 24 and the end of the shaft is fixedly connected to a magnet 26. The end of the vibration probe 27 is fixedly connected to a piezoelectric sensor 28. The side wall of the end of the piezoelectric sensor 28 faces the magnet 26. Two back plates 241 are symmetrically arranged on the top of the mounting plate 24 near the pointer 25. The side wall of the back plate 241 is divided into a scale. Micro switches 242 are arranged on the top of both sides of the scale. A warning light 243 is arranged at the center of the top of the back plate 241. The warning light 243 on each back plate 241 is electrically connected to the two micro switches 242 on the current back plate 241. The piezoelectric sensor 28 contains a built-in piezoelectric quartz crystal. When the piezoelectric quartz crystal receives pressure from the vibration probe 27, it generates an electric charge. The charge increases with increasing pressure, and this charge attracts the magnet 26 electrostatically, causing it to swing. The distance from the end of the pointer 25 to the shaft is longer than the distance from the magnet 26 to the shaft. Through the transmission of the shaft and the amplification by the pointer 25, the vibration of the transmission component can be visually magnified to a visible level. Personnel can judge the vibration of the gear shaft 201 and the wear of the transmission components based on the scale, without needing to use... When a handheld vibration meter is used for measurement, and the vibration displacement reaches the warning line, the charge generated by the piezoelectric sensor 28 attracts the magnet 26 to deflect and the swing continues to increase. Eventually, the end of the pointer 25 touches the micro switch 242 during the swing, causing the warning light 243 to flash and alarm, reminding the staff to perform maintenance and replacement to prevent greater damage to the equipment. Generally, personnel can determine from actual use experience that maintenance is required when the vibration reaches a specific value, rather than only after an alarm is triggered. The warning light 243 serves more as a reminder to prevent omissions due to negligence.

[0049] When using this invention, before assembling the positive pressure screw conveyor, it is necessary to strictly inspect and remove any sharp edges, burrs, etc., left over from the machining of the parts to ensure that the seals are not damaged. Before assembly, the seals are soaked in lubricating oil and sealant is applied to the mating surfaces of each seal. After assembly, industrial gear oil is injected into the gearbox 2 until the oil level reaches the middle position of the oil level indicator. After lubricating oil is injected into the self-aligning roller bearing 7 through the grease nipple 801, the motor reducer 1 is started. The motor reducer 1 drives the transmission gear in the gearbox 2 to rotate, and the gear shaft 201, the conveying screw 5, and the transmission shaft 501 follow suit. The positive pressure screw conveyor is then in working condition. The material enters from the inlet 6 and is conveyed to the outlet 3 to complete the conveying process. During operation, the transmission shaft 501 rotates within the self-aligning roller bearing 7, and the sealing assembly 9 seals the self-aligning roller bearing 7 and the transmission shaft 501. As the working time increases, the lubricating oil content... If there is a loss, the level sensor 802 continuously monitors the lubricating oil level. When the oil level drops to the warning line, the level sensor 802 controls the telescopic end of the electric cylinder 183 to retract through the controller, causing the sealing plug 184 to disengage from the air hole 185. At this time, the continuously rotating fixed rod 21 and ball head 211 push the sliding block 20 to slide back and forth along the oil nozzle interface 181 during one rotation. Each time the sliding block 20 is pushed open by the ball head 211, the oil groove 182 can be exposed, and the lubricating oil in the lubricating oil tank 18 can flow into the oil nozzle 801 through the oil groove 182 to lubricate the self-aligning roller bearing 7. After the oil level reaches the two-thirds safety line, the level sensor 802 controls the telescopic end of the electric cylinder 183 to extend through the controller, so that the sealing plug 184 is connected to the air hole 185, ensuring the airtightness of the lubricating oil tank 18 and preventing the lubricating oil from flowing out of the oil groove 182.

[0050] During the operation of the positive pressure screw conveyor, the vibration probe 27 continuously abuts against the gear shaft 201. The vibration displacement of the gear shaft 201 is transmitted to the piezoelectric sensor 28 via the vibration probe 27. The piezoelectric sensor 28 generates an electric charge under the pressure of the vibration probe 27. As the operating time increases and due to the influence of some external factors, the wear of the transmission components increases, and the vibration of the gear shaft 201 also increases, causing the amount of electric charge generated by the piezoelectric sensor 28 to rise. This electric charge attracts the magnet 26, causing the magnet 26 to deflect and swing. Under the reversing action of the shaft, the pointer 25 is driven. The swinging motion, because the distance from the end of pointer 25 to the shaft is longer than the distance from magnet 26 to the shaft, amplifies the amount of deflection of magnet 26. This allows the amount of swing of pointer 25 to be visually observed on the backplate 241, and the vibration of gear shaft 201 and the wear of transmission components to be judged according to the scale. When the vibration displacement reaches the warning line, the charge generated by piezoelectric sensor 28 attracts magnet 26 to continue to increase the amount of deflection, eventually causing the end of pointer 25 to touch micro switch 242 during the swing, causing warning light 243 to flash and alarm, reminding staff to perform maintenance and replacement to prevent greater damage to the equipment.

[0051] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

[0052] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A positive pressure screw conveyor, comprising a cylinder (4) and a conveying screw (5), characterized in that: The cylinder (4) is a hollow double cylinder structure. Two conveying spirals (5) are rotatably connected at both ends of the cylinder (4) in a "human" shape. Each conveying spiral (5) is fixedly connected to both ends of a drive shaft (501). A gear shaft (201) is fixedly connected to the drive shaft (501) at one end of the conveying spiral (5). A warning mechanism (22) is provided between the two gear shafts (201). A self-aligning roller bearing (7) is rotatably connected to the drive shaft (501) at the other end of the conveying spiral (5), and a self-lubricating component (19) is provided on the end side wall. A sealing component (9) is provided around the self-aligning roller bearing (7). The sealing assembly (9) includes a sealing seat (10) and an inner pressure cover (12). The sealing seat (10) is bolted to the end of the cylinder (4) near the self-aligning roller bearing (7). The inner pressure cover (12) is bolted to the inner wall of the sealing seat (10) inside the cylinder (4). The outer pressure cover (8) is bolted to the outer end of the sealing seat (10) outside the cylinder (4). An oil nozzle (801) is provided in the center of the outer pressure cover (8). The warning mechanism (22) includes a pointer (25) and a vibration probe (27). Wear-resistant arc-shaped blocks (23) are slidably connected to the opposite surfaces of the two gear shafts (201). A hollow mounting plate (24) is fixedly connected between the two arc-shaped blocks (23). Two vibration probes (27) are symmetrically arranged on the inner wall of the bottom of the mounting plate (24) and respectively abut against the two gear shafts (201). Two symmetrical pointers (25) are rotatably connected to the outer wall of the mounting plate (24). The self-lubricating assembly (19) includes a fixed rod (21) and a ball head (211). The drive shaft (501) is fixedly connected to the center of the side wall of the outer pressure cover (8). The ball head (211) is fixedly provided at the bottom of the end of the fixed rod (21). The oil nozzle (801) is threadedly connected to an oil nozzle interface (181). A sliding block (20) is slidably connected inside the oil nozzle interface (181). An oil groove (182) is opened on the bottom inner wall of the oil nozzle interface (181). A shaft elastic retaining ring (17) is provided between the outer wall of the self-aligning roller bearing (7) and the drive shaft (501). The outer pressure cover (8) is close to A liquid level sensor (802) is fixedly installed on the bottom side of the shaft elastic retaining ring (17). A lubricating oil tank (18) is fixedly connected to the end of the oil nozzle interface (181). The lubricating oil tank (18) contains lubricating oil. The top of the lubricating oil tank (18) is provided with an air hole (185) and an oil filling port. A truss is fixedly installed on the inner wall of the top of the lubricating oil tank (18). An electric cylinder (183) is fixedly installed at the top of the truss. A sealing plug (184) is fixedly installed at the top of the telescopic end of the electric cylinder (183). The sealing plug (184) is adapted to the air hole (185). The electric cylinder (183) is electrically connected to the liquid level sensor (802).

2. The positive pressure screw conveyor according to claim 1, characterized in that: A motor reducer (1) is provided on one side of the cylinder (4), and a gearbox (2) is provided between the motor reducer (1) and the cylinder (4). Two meshing transmission gears are rotatably connected inside the gearbox (2). One of the transmission gears is fixedly connected to the output shaft of the motor reducer (1), and the gear shaft (201) is fixedly connected to the side of the two transmission gears away from the motor reducer (1).

3. The positive pressure screw conveyor according to claim 1, characterized in that: The cylinder (4) has a discharge port (3) on the side close to the motor reducer (1) and a feed port (6) on the side away from the motor reducer (1).

4. A positive pressure screw conveyor according to claim 1, characterized in that: A wear-resistant sleeve (15) is fitted between the sealing seat (10) and the drive shaft (501). A copper sleeve (14) is fitted on the outer wall of the wear-resistant sleeve (15) near the inner pressure cover (12). Two Y-shaped sealing rings (16) are provided between the outer wall of the wear-resistant sleeve (15) and the sealing seat (10). The Y-shaped sealing rings (16) are located on the side away from the inner pressure cover (12).

5. A positive pressure screw conveyor according to claim 1, characterized in that: The inner wall of the cylinder (4) near the self-aligning roller bearing (7) is bolted with a sealing outer sleeve (11), and the end of the sealing outer sleeve (11) is snapped with a sealing inner sleeve (13). The sealing inner sleeve (13) is screwed onto the bushing on the outer wall of the drive shaft (501).

6. A positive pressure screw conveyor according to claim 1, characterized in that: The sliding block (20) is a cylindrical structure with a wedge-shaped block at the top. The oil groove (182) is located below the sliding block (20) and the length of the oil groove (182) is less than the length of the bottom of the sliding block (20).

7. A positive pressure screw conveyor according to claim 1, characterized in that: The bottom shaft of the pointer (25) passes through the mounting plate (24) and a magnet (26) is fixedly connected to the end of the shaft. A piezoelectric sensor (28) is fixedly connected to the end of the vibration probe (27). The side wall of the end of the piezoelectric sensor (28) faces the magnet (26). Two back plates (241) are symmetrically arranged on the top of the mounting plate (24) near the pointer (25). The side wall of the back plate (241) is divided into a scale. Micro switches (242) are arranged on the top of both sides of the scale. A warning light (243) is arranged at the center of the top of the back plate (241). The warning light (243) on each back plate (241) is electrically connected to the two micro switches (242) on the current back plate (241).

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