A new type of intermediate suspension device for screw conveyors

Abstract

The utility model discloses a novel intermediate suspension device for screw conveyor, and the intermediate suspension device is connected with the upper and lower section shafts of the novel screw conveyor through connecting flanges and is fixed with the top cover plate of the screw conveyor through bolts. The bearing seat is split type, and the split type bearing is built-in, which facilitates disassembly and assembly and maintenance. The top cover plate is provided with a grease filling port, which facilitates daily maintenance, reduces bearing wear and improves bearing service life. The bearing seat is provided with a built-in sealing box on both sides, and the sealing box is provided with a packing ring and sealing packing mud, forming a dynamic sealing layer to effectively prevent materials from entering. The top cover plate is provided with a packing mud filling pipe to supplement the lost sealing packing mud. The sealing packing mud is in the form of mortar, containing graphite and low-friction coefficient fibers, and is suitable for a temperature range of -20 DEG C to 200 DEG C, capable of reducing friction, reducing wear, maintaining sealing performance, absorbing impact load, prolonging the service life of the sealing system and the screw conveyor and improving the overall operation efficiency of the equipment.

Description

Technical Field

[0001] This utility model belongs to the field of conveyor technology, specifically relating to a novel intermediate suspension device for a screw conveyor. Background Technology

[0002] A screw conveyor is a mechanical device that uses a motor to drive a screw shaft to rotate, thereby propelling materials horizontally, inclined, or vertically. When conveying long distances, the screw shaft is prone to bending deformation due to its own weight and material load. Therefore, an intermediate suspension device is required to provide support, prevent the screw shaft from bending, vibrating, or rubbing against the casing, and ensure stable conveying operation.

[0003] Currently, the intermediate suspension devices of screw conveyors commonly used in the chemical industry mostly employ copper bushings or oil-impregnated bearings as support structures, which have the following significant drawbacks: Insufficient sealing, leading to accelerated wear due to material intrusion: Powdered or granular materials being conveyed easily enter the bushings or bearing gaps, creating an abrasive effect, accelerating the wear of the shaft and bearings, and even causing the suspension device to fail. Once the support fails, the screw shaft sinks and rubs against the housing, ultimately causing the motor to overload and trip, affecting continuous production; Difficult maintenance and high upkeep costs: Existing suspension devices mostly use a socket connection, fixed in the middle by a pin. During maintenance, the tail connecting shaft must be completely pulled out to disassemble the suspension device and replace the bushings or bearings. This structure is cumbersome to assemble and disassemble, time-consuming, and labor-intensive, seriously affecting equipment maintenance efficiency.

[0004] Therefore, there is an urgent need for a reliable and easy-to-maintain intermediate suspension device for screw conveyors to solve the problems of material intrusion leading to rapid wear and difficult maintenance in existing technologies, and to improve the operational stability and service life of the equipment. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a novel intermediate suspension device for screw conveyors. By adopting a novel sealing filler mud and split bearings, and a flange connection method, the service life of the suspension bearing device is extended, and it can be easily and quickly repaired in the event of a sudden failure.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A novel intermediate suspension device for a screw conveyor is fixedly connected to the top cover plate of the screw conveyor. The intermediate suspension device includes a split bearing housing and a split bearing inside the split bearing housing. Both sides of the split bearing are provided with sealing glands and split sealing caps. The sealing glands are located between the split sealing caps and the split bearing housing. An intermediate shaft is provided inside the split bearing. The two ends of the intermediate shaft are connected to the rotating shaft inside the screw conveyor through connecting flanges.

[0008] The sealing gland contains, in sequence, an inner support packing, sealing filler, and an outer pre-tightening packing. The inner support packing is located on the side closest to the split bearing. The split sealing gland is fixedly connected to the split bearing seat by bolts, and the seal is achieved by pre-tightening the connecting bolts.

[0009] As a further preferred embodiment, the split bearing housing is provided with a grease filling port. One end of the grease filling port is located on the outer surface of the top cover plate of the screw conveyor, and the internal channel at the other end is connected to the space where the split bearing is located for connecting an external grease filling device.

[0010] As a further preferred embodiment, the top cover plate is provided with an opening that communicates with one end of the filler mud injection pipe, and the other end of the filler mud injection pipe communicates with the sealing chamber of the sealing gland for replenishing the sealing filler mud.

[0011] As a further preferred embodiment, the sealing filler mud is a putty-like substance containing graphite and low-friction coefficient fibers, and is suitable for a temperature range of -20℃ to 200℃.

[0012] As a further preferred embodiment, both the split bearing housing and the split bearing are of an upper and lower split structure, and are connected by bolts.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. A high-performance sealing filler mortar is used. This material is a putty-like composite with a wide applicable temperature range (-20~200℃). It contains graphite and low-friction coefficient fibers, extending the service life of the shaft and reducing the cost and downtime caused by frequent shaft replacements. During operation, the fibers in the filler mortar adhere evenly to the shaft surface and rotate synchronously with the shaft, forming a dynamic protective layer. As the shaft rotates, a stationary layer and a rotating layer spontaneously form inside the filler mortar, creating an irregular microchannel structure between the two layers, effectively preventing external materials from intruding into the bearing.

[0015] 2. This utility model is improved to a flange connection structure and is equipped with split bearings and upper and lower split bearing seats. When the bearing or bearing seat fails, the entire shaft does not need to be disassembled and can be directly replaced online, which greatly shortens the maintenance time. Even in extreme cases such as shaft wear or breakage, only the flanges at both ends need to be removed to quickly take out the suspension device for inspection and repair, which significantly improves maintenance efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] The components include: a) rotating shaft; b) intermediate shaft; 1) connecting flange; 2) split sealing gland; 31) outer pre-tightening packing; 32) inner support packing; 4) sealing packing mud; 5) packing mud filling pipe; 6) grease filling port; 7) split bearing; 8) split bearing housing; and 9) top cover plate. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] like Figure 1 As shown, this invention discloses a novel intermediate suspension device for a screw conveyor, which is fixedly connected to the top cover plate 9 of the screw conveyor by bolts. The intermediate suspension device includes a split bearing seat 8 and a split bearing 7 inside the split bearing seat 8. Both sides of the split bearing 7 are provided with sealing boxes. An intermediate shaft b is provided inside the split bearing 8. The two ends of the intermediate shaft b are respectively connected to the rotating shaft a inside the screw conveyor through connecting flanges 1.

[0020] Furthermore, the bearing housing is a split bearing housing 8, which is composed of two parts, upper and lower. The upper part is provided with bolt holes, which are fastened to the corresponding mounting holes on the top cover plate 9 by bolts. During installation, it is necessary to ensure that the bolts are tightened evenly to ensure a tight, stable and horizontal connection. A split bearing 7 is built into the split bearing housing 8. A grease filling port 6 is provided on the outer surface of the top cover plate 9 of the screw conveyor for connecting external grease filling equipment.

[0021] Specifically, the connection between the split bearing housing 8 and the top cover plate 9 enhances the stability of the suspension device and facilitates inspection, maintenance, and component replacement; the split bearing 7 is easy to replace, can adapt to shaft deformation and displacement, and extends component life; the grease filling port 6 provides convenience for bearing lubrication, ensures uniform lubrication, reduces friction and wear, and ensures stable operation of the screw conveyor.

[0022] Furthermore, the sealing gland is sequentially equipped with an inner support packing 32, a sealing filler 4, and an outer pre-tightening packing 31. The split sealing gland 2 is fixedly connected to the split bearing seat 8 by bolts. The tight seal is achieved by pre-tightening the connecting bolts. The sealing gland is located between the split sealing gland 2 and the split bearing seat 8.

[0023] Specifically, the split sealing gland 2 is cylindrical or disc-shaped, with a central shaft hole for the intermediate shaft b to pass through, and bolt holes on the outer periphery of the split sealing gland 2. It is connected to the split bearing seat 8 by bolts, and the bolts are evenly distributed to ensure that the gland is subjected to uniform force.

[0024] Specifically, the semi-circular hole inside the split bearing housing 8, after closing, transitionally or with an interference fit with the outer ring of the split bearing 7. The shoulder inside the split bearing housing 8 restricts the axial movement of the outer ring of the split bearing 7. The split bearing 7 is also divided into upper and lower halves, which fit tightly inside the split bearing housing 8 during assembly. The base of the split bearing 8 is bolted to the top cover plate 9. The outer shell of the split bearing housing 8 completely encloses the split bearing 7. The inner ring of the split bearing 7 achieves a tight fit with the intermediate shaft b, providing a low-friction support environment for the rotation of the intermediate shaft b. The sealing gland is connected to the flange on the outside of the split bearing housing 8 by bolts, allowing the intermediate shaft b to pass smoothly through the sealing gland, the split bearing housing 8, and the split bearing 7. When the gland is tightened by bolts, the gland squeezes the internal packing, causing it to elastically deform. This not only tightly fits the surface of the intermediate shaft b but also fills the gap between the inner wall of the packing cavity and the shaft. While ensuring the stable rotation of the intermediate shaft b, it effectively prevents media leakage and the intrusion of external impurities, ensuring the normal operation of the mechanical system.

[0025] Specifically, the split sealing gland 2 is fixed to both sides of the split bearing housing 8 to apply axial clamping force to the outer pre-tightening packing 32; one end of the inner supporting packing 32 abuts against the sealing gland step to prevent lubricating oil from leaking from the split bearing 7 into the sealing gland area, while preventing the medium in the stuffing gland from entering the bearing housing, avoiding mutual contamination and ensuring their respective normal working environment. The outer pre-tightening packing 31 is used to transfer the axial clamping force of the split sealing gland 2 to the sealing packing mud 4 in the sealing gland, causing the sealing packing mud 4 to expand radially and tightly adhere to the surface of the intermediate shaft b. As the intermediate shaft b rotates, the fibers in the sealing packing mud adhere to the shaft and rotate with it, while simultaneously separating into a stationary layer and a rotating layer, forming irregular fine channels between the stationary and dynamic layers. These fine channels further enhance the sealing effect; even if tiny material particles attempt to pass through, they will be blocked by these channels, thus achieving effective sealing of the material.

[0026] Furthermore, the top cover plate 9 is equipped with a filler mud injection pipe 5, which communicates with the sealing chamber of the stuffing box to replenish the sealing filler mud 4. As the screw conveyor operates, the sealing filler mud 4 will gradually be worn away due to friction, material erosion, and other factors. The filler mud injection pipe 5 can periodically replenish the sealing filler mud to ensure that there is always enough sealing filler mud 4 in the sealing chamber.

[0027] Furthermore, the sealing filler 4 is a putty-like substance containing graphite and low-friction coefficient fibers, with a suitable temperature range of -20℃ to 200℃. During shaft rotation, these components effectively reduce the friction between the shaft and the sealing filler 4. When the shaft rotates at high speed within the sealing filler 4, the low coefficient of friction reduces wear on the shaft surface and also slows down the wear rate of the sealing filler 4 itself. This not only extends the service life of the shaft, reducing the cost and downtime caused by frequent shaft replacements, but also allows the sealing filler 4 to maintain good sealing performance for a longer period without frequent replacements, thus improving the overall operating efficiency of the equipment. The wide suitable temperature range of -20℃ to 200℃ enables the sealing filler 4 to operate normally in various complex working environments of the screw conveyor. Moreover, the filler 4 possesses excellent elastic deformation capabilities, allowing it to absorb occasional impact loads during equipment operation. During operation, screw conveyors may experience impacts due to uneven material transport, equipment vibration, and other factors. When an impact occurs, the sealing filler mud 4 can buffer these impact forces through its own elastic deformation, just like an elastic cushioning pad, thereby further extending the service life of the entire sealing system and the screw conveyor.

[0028] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solution of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A novel intermediate suspension device for a screw conveyor, characterized in that: The intermediate suspension device is fixedly connected to the top cover plate (9) of the screw conveyor; the intermediate suspension device includes a split bearing seat (8) and a split bearing (7) inside the split bearing seat (8). Both sides of the split bearing (7) are provided with a sealing box and a split sealing cover (2). The sealing box is located between the split sealing cover (2) and the split bearing seat (8). The split bearing (7) is provided with an intermediate shaft (b). The two ends of the intermediate shaft (b) are connected to the rotating shaft (a) inside the screw conveyor through connecting flanges (1). The sealing box contains an inner support packing (32), a sealing filler (4), and an outer pre-tightening packing (31) in sequence. The inner support packing (32) is located on the side close to the split bearing (7). The split sealing gland (2) is fixedly connected to the split bearing seat (8) by bolts, and the seal is achieved by pre-tightening the connecting bolts.

2. The novel intermediate suspension device for a screw conveyor according to claim 1, characterized in that: The split bearing housing (8) is provided with a grease filling port (6). One end of the grease filling port (6) is located on the outer surface of the top cover plate (9) of the screw conveyor, and the internal channel at the other end is connected to the space where the split bearing (7) is located, for connecting an external grease filling device.

3. The novel intermediate suspension device for a screw conveyor according to claim 1, characterized in that: The top cover plate (9) has an opening that connects to one end of the filler mud injection pipe (5), and the other end of the filler mud injection pipe (5) connects to the sealing chamber of the sealing box for replenishing the sealing filler mud (4).

4. The intermediate suspension device according to claim 3, characterized in that: The sealing filler mud (4) is a putty-like substance containing graphite and low friction coefficient fibers, and is suitable for a temperature range of -20℃ to 200℃.

5. The intermediate suspension device according to claim 1, characterized in that: Both the split bearing housing (8) and the split bearing (7) are split structures, connected by bolts.

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