An oil-free mid-hoist shaft mounting structure

Abstract

The utility model provides an oil -free middle crane axle mounting structure, include: crane axle support and main shaft, crane axle support includes support body, is provided with main shaft mounting hole on support body, is inlayed with oil -containing copper bush in main shaft mounting hole, is evenly provided with felt mounting hole in the left and right sides of oil -containing copper bush in main shaft mounting hole, felt mounting hole is installed with teflon gasket, felt and baffle ring from inside to outside in proper order, the outside of felt mounting hole is provided with snap spring mounting hole, and the inside snap spring mounting hole is installed with inner snap spring, main shaft is along transversely and is installed in main shaft mounting hole, and along transversely and is penetrated the inside snap spring, baffle ring, felt, teflon gasket and oil -containing copper bush. The utility model discloses an oil -free middle crane axle mounting structure need not to add oil, maintenance -free, and the use cost is low, and can effectively prevent dust from entering inside moreover adopts double -sealed structure, plays good protection function.

Description

Technical Field

[0001] This utility model relates to the technical field of hanger shaft installation structure, specifically to an oil-free hanger shaft installation structure. Background Technology

[0002] When a screw conveyor is in operation, the support frame remains stationary, while the sealing ring on the main shaft rotates with the main shaft. Since most screw conveyors are used for conveying materials at an upward incline, the rotating screw shaft pushes the material upwards, resulting in a significant downward axial force. Furthermore, the screw shaft is typically 2.5–5 meters long and rotates at speeds between 145–290 RPM, causing considerable oscillation during operation. Therefore, wear between the main shaft and the support frame is relatively severe. Once the wear reaches a certain level, it will damage the sealing structure formed by the sealing groove and sealing ring, allowing dust to enter and causing abnormal noise, wear, or even breakage of the central shaft, ultimately leading to conveyor malfunction and shutdown.

[0003] To ensure reliable lubrication and sealing of the central hanging shaft, each shaft is individually equipped with an oil injection pipe. To reduce the length of the oil injection pipe, the oil injection points are located at both ends of the screw conveyor. However, because the oil injection pipes for the central hanging shafts in the middle of the screw conveyor are relatively long, reaching 7-14 meters, the oil injection resistance is high, easily leading to blockage of the oil passages. During screw conveyor operation, each central hanging shaft requires manual oiling once a day.

[0004] In summary, the existing central suspension shaft installation structure has the following main shortcomings:

[0005] 1. The oil injection line is long, has high resistance, and is prone to blockage.

[0006] 2. Each intermediate lifting shaft is equipped with a separate oil injection pipeline, which is costly.

[0007] 3. The bracket and spindle are in direct contact, resulting in poor wear resistance and a short service life.

[0008] 4. It requires daily lubrication, and there are many lubrication points, resulting in high maintenance costs.

[0009] 5. There is a certain gap between the bracket and the main shaft, which will cause grease to overflow and contaminate the conveyed materials. Utility Model Content

[0010] To address the shortcomings of existing technologies, this utility model proposes an oil-free central hanging shaft installation structure that requires no oiling, is maintenance-free, has low operating costs, and employs a double sealing structure to effectively prevent dust from entering the interior, providing excellent protection.

[0011] To achieve the above technical solution, this utility model provides an oil-free hanging shaft mounting structure, including: a hanging shaft bracket and a main shaft. The hanging shaft bracket includes a bracket body, on which a main shaft mounting hole is provided. An oil-impregnated copper sleeve is embedded in the main shaft mounting hole. The outer circle of the oil-impregnated copper sleeve is interference-fitted with the main shaft mounting hole and locked by a slab screw. Felt mounting holes are provided on both the left and right sides of the oil-impregnated copper sleeve in the main shaft mounting hole. A Teflon gasket, felt, and a retaining ring are installed sequentially from the inside to the outside of the felt mounting holes. A snap ring mounting hole is provided on the outside of the felt mounting holes. An inner snap ring is installed in the snap ring mounting hole. The inner snap ring locks the Teflon gasket, felt, and retaining ring in the felt mounting hole. The main shaft is installed transversely through the main shaft mounting hole and transversely through the inner snap ring, retaining ring, felt, Teflon gasket, and oil-impregnated copper sleeve.

[0012] In the above technical solution, during actual operation, based on the screw conveyor structure, the hanging shaft support is fixed stationary on the outer tube of the screw conveyor. The two ends of the central hanging shaft are connected to the screw shaft via splines, serving to support and transmit torque. When the screw conveyor is working, the central hanging shaft rotates synchronously with the screw shaft, causing relative motion between the shaft and the oil-impregnated copper sleeve. Due to capillary action, the lubricating oil impregnated in the fine pores of the oil-impregnated copper sleeve seeps out, forming a boundary lubricating oil film at the contact point between the shaft and the sleeve. This prevents direct contact between the shaft and the sleeve, reducing friction and delaying wear. Furthermore, Teflon gaskets and felt are installed at both ends of the oil-impregnated copper sleeve, effectively preventing dust from entering and providing excellent protection.

[0013] Preferably, the main shaft is provided with two snap ring mounting slots, and an external snap ring is installed in each snap ring mounting slot.

[0014] Preferably, the bracket body is integrally cast from QT450 ductile iron, and an arc-shaped plate is provided on the top of the bracket body, with fixing screw holes provided on the arc-shaped plate. By integrally casting the bracket body from QT450 ductile iron, the overall strength of the bracket body can be enhanced, and the arc-shaped plate and fixing screw holes on the arc-shaped plate facilitate the installation and docking of the bracket body with external equipment.

[0015] Preferably, the spindle adopts an optical shaft structure and is made of 40Cr alloy structural steel, which can improve the wear resistance of the spindle.

[0016] Preferably, the spindle surface is high-frequency quenched, with a hardness greater than 50 HRC and a hardened layer depth of 1.5-2.5 mm, which can improve the spindle's wear resistance.

[0017] The beneficial effects of the oil-free central hanger shaft mounting structure provided by this utility model are as follows:

[0018] 1) When the spindle comes into contact with the oil-impregnated copper sleeve on the hanger, the spindle and the oil-impregnated copper sleeve move relative to each other. Due to capillary action, the lubricating oil impregnated in the fine pores of the oil-impregnated copper sleeve seeps out and forms a boundary lubricating oil film of a certain state at the contact point between the spindle and the oil-impregnated copper sleeve. This avoids direct contact between the spindle and the oil-impregnated copper sleeve, thereby reducing friction and delaying wear.

[0019] 2) The oil-impregnated copper sleeve has Teflon gaskets and felt on both sides, providing a double seal to prevent dust from entering the interior and improve sealing performance.

[0020] 3) No refueling required, maintenance-free, reducing operating costs.

[0021] 4) Screw conveyors do not require lubrication accessories, reducing product costs.

[0022] 5) Oil-free operation effectively prevents contamination of transported materials. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the assembly structure of this utility model.

[0024] Figure 2 This is a sectional view of the hanging shaft bracket of this utility model.

[0025] Figure 3 This is a side view of the hanging shaft bracket of this utility model.

[0026] Figure 4 This is a side view of the main shaft in this utility model.

[0027] In the diagram: 1. Spindle; 11. Snap ring mounting slot; 2. Hanging shaft bracket; 21. Bracket body; 22. Oil-impregnated copper sleeve; 23. Screw hole; 24. Felt mounting hole; 25. Snap ring mounting hole; 26. Spindle mounting hole; 27. Arc plate; 28. Fixing screw hole; 3. External snap ring; 4. Teflon washer; 5. Felt; 6. Retaining ring; 7. Internal snap ring; 8. Screw on the seam. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0029] Example: An oil-free central suspension shaft mounting structure.

[0030] Reference Figures 1 to 4As shown, an oil-free mid-spindle mounting structure includes: a spindle bracket 2 and a spindle 1. The spindle 1 adopts a smooth shaft structure and is made of 40Cr alloy structural steel. The surface of the spindle 1 is high-frequency quenched, with a hardness greater than 50HRC and a hardened layer depth of 2mm, which can improve the high temperature resistance and wear resistance of the spindle 1 to meet the requirements of various working conditions. The spindle 1 is provided with two snap ring mounting slots 11, and an external snap ring 3 is installed in each snap ring mounting slot 11 to limit the installation position of the spindle 1.

[0031] The hanging shaft bracket 2 includes a bracket body 21, which is integrally cast from QT450 ductile iron. The top of the bracket body 21 is provided with an arc-shaped plate 27, and the arc-shaped plate 27 is provided with fixing screw holes 28. By integrally casting the bracket body 21 from QT450 ductile iron, the overall strength of the bracket body 21 can be enhanced. The arc-shaped plate 27 and the fixing screw holes 28 on the arc-shaped plate 27 facilitate the installation and docking of the bracket body 21 with external equipment.

[0032] The bracket body 21 is provided with a spindle mounting hole 26, and an oil-impregnated copper sleeve 22 is embedded in the spindle mounting hole 26. The outer circle of the oil-impregnated copper sleeve 22 is interference-fitted with the spindle mounting hole 26. A screw hole 23 is provided on the end side of the oil-impregnated copper sleeve 22, and the outer circle of the oil-impregnated copper sleeve 22 is locked to the spindle mounting hole 26 by a saddle screw 8 to prevent loosening. Felt mounting holes 24 are provided on both the left and right sides of the oil-impregnated copper sleeve 22 in the spindle mounting hole 26. A Teflon gasket 4, a felt 5, and a retaining ring 6 are installed sequentially from the inside to the outside of the hole 24. A snap ring mounting hole 25 is provided on the outside of the felt mounting hole 24. An inner snap ring 7 is installed in the snap ring mounting hole 25. The inner snap ring 7 locks the Teflon gasket 4, the felt 5, and the retaining ring 6 in the felt mounting hole 24. The main shaft 1 is installed transversely through the main shaft mounting hole 26, and also transversely through the inner snap ring 7, the retaining ring 6, the felt 5, the Teflon gasket 4, and the oil-impregnated copper sleeve 22.

[0033] In this embodiment, during actual operation, according to the screw conveyor structure, the hanging shaft bracket 2 is fixed stationary on the outer tube of the screw conveyor, and the two ends of the main shaft 1 are connected to the screw shaft through splines. The middle hanging shaft plays the role of support and torque transmission. When the screw conveyor is working, the middle hanging shaft main shaft 1 rotates synchronously with the screw shaft, and the main shaft 1 and the oil-impregnated copper sleeve 22 generate relative motion. Due to capillary action, the lubricating oil impregnated in the fine pores of the oil-impregnated copper sleeve 22 seeps out, forming a boundary lubricating oil film of a certain state at the contact point between the main shaft 1 and the oil-impregnated copper sleeve 22, avoiding direct contact between the main shaft 1 and the oil-impregnated copper sleeve 22, thereby reducing friction and delaying wear. In addition, Teflon gaskets 4 and felt 5 are respectively installed at both ends of the oil-impregnated copper sleeve 22, which can effectively prevent dust from entering the interior of the oil-impregnated copper sleeve 22 from the ends, providing a good protective effect.

[0034] The beneficial effects of the oil-free hanging shaft installation structure provided by this utility model are as follows: (1) The main shaft 1 contacts the oil-impregnated copper sleeve 22 on the hanging shaft bracket 2, and the main shaft 1 and the oil-impregnated copper sleeve 22 generate relative movement. Due to capillary action, the lubricating oil impregnated in the fine pores of the oil-impregnated copper sleeve 22 seeps out and forms a certain state of boundary lubricating oil film at the contact point between the main shaft 1 and the oil-impregnated copper sleeve 22, avoiding direct contact between the main shaft 1 and the oil-impregnated copper sleeve 22, so as to reduce friction and delay wear; (2) The oil-impregnated copper sleeve 22 has Teflon gaskets 4 and felt 5 on both sides, which provides double sealing to prevent dust from entering the interior and improves the sealing performance; (3) No oiling is required, maintenance is not required, and the operating cost is reduced; (4) The screw conveyor does not need to be equipped with oiling accessories, which reduces the product cost; (5) Oil-free operation can effectively prevent contamination of the conveyed materials.

[0035] The above description is only a preferred embodiment of the present utility model. However, the present utility model should not be limited to the content disclosed in the embodiment and the accompanying drawings. Therefore, any equivalent or modified embodiments made without departing from the spirit disclosed in the present utility model shall fall within the protection scope of the present utility model.

Claims

1. An oil-free center-mounted shaft installation structure, characterized in that... include: The device comprises a hanger bracket and a main shaft. The hanger bracket includes a bracket body with a main shaft mounting hole. An oil-impregnated copper sleeve is embedded in the main shaft mounting hole. The outer circle of the oil-impregnated copper sleeve is interference-fitted with the main shaft mounting hole and locked by a slit screw. Felt mounting holes are provided on both the left and right sides of the oil-impregnated copper sleeve in the main shaft mounting hole. A Teflon gasket, felt, and a retaining ring are installed sequentially from the inside to the outside of the felt mounting holes. A snap ring mounting hole is provided on the outside of the felt mounting holes. An inner snap ring is installed in the snap ring mounting hole. The inner snap ring locks the Teflon gasket, felt, and retaining ring in the felt mounting hole. The main shaft is installed transversely through the main shaft mounting hole and also transversely through the inner snap ring, retaining ring, felt, Teflon gasket, and oil-impregnated copper sleeve.

2. The oil-free central suspension shaft mounting structure as described in claim 1, characterized in that: The main shaft is provided with two snap ring mounting slots, and an external snap ring is installed in each snap ring mounting slot.

3. The oil-free central suspension shaft mounting structure as described in claim 1, characterized in that: The bracket body is integrally cast from QT450 ductile iron. An arc-shaped plate is provided on the top of the bracket body, and fixing screw holes are provided on the arc-shaped plate.

4. The oil-free central suspension shaft mounting structure as described in claim 1, characterized in that: The main shaft adopts an optical shaft structure and is made of 40Cr alloy structural steel.

5. The oil-free central suspension shaft mounting structure as described in claim 1, characterized in that: The spindle surface is high-frequency quenched, with a hardness greater than 50HRC and a hardened layer depth of 1.5-2.5mm.

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