A new type of heat-resistant roller screen

Abstract

This utility model discloses a novel heat-resistant roller screen, comprising a screen box, several parallel rollers, and annular cooling bearing seats for supporting the rollers. Each roller is fitted with a heat-insulating sleeve and a roller disc, the heat-insulating sleeve and roller disc being spaced apart axially. A long groove is provided axially along the circumference of the roller, serving both as a connection to the roller disc and, together with the heat-insulating sleeve, forming a hollow cavity / hollow structure to reduce heat transfer towards the bearing. End sleeves are provided at both ends of the roller, abutting against the roller disc via elastic elements and secured with locking bolts to achieve axial pre-tightening of the heat-insulating sleeve and roller disc assembly. Each annular cooling bearing seat contains a cooling water channel, forming a cooling water system through cooling water inlet pipes, cooling water outlet pipes, and other piping. This structure, through a combination of heat insulation and forced cooling, enables the roller screen to operate stably under high-temperature material conditions, significantly reducing bearing temperature rise and extending the service life of the rollers and bearing assemblies.

Description

Technical Field

[0001] This utility model relates to the field of roller screen technology, specifically a novel heat-resistant roller screen. Background Technology

[0002] In recent years, with the widespread application of screening equipment in industries such as coal, metallurgy, mining, and power, roller screens, as an important piece of equipment in material screening systems, have been widely used in cold material screening due to their advantages such as simple structure, large processing capacity, and resistance to clogging. Traditional roller screens typically consist of several parallel rollers forming a screening channel. The rotation of the rollers conveys the material along the screening direction, and particle classification is achieved by relying on the gap between adjacent rollers. They are particularly suitable for medium and coarse screening of lumpy and granular materials.

[0003] However, hot material screening remains an unavoidable process in metallurgical, coking, and some high-temperature material conveying and processing technologies. For high-temperature materials, heat-resistant vibrating screens or specialized hot screening equipment are currently widely used in engineering. While these devices can meet the requirements for high-temperature materials to a certain extent, they generally suffer from complex structures, high manufacturing costs, high energy consumption, frequent maintenance of vibrating components, and short replacement cycles for vulnerable parts. This results in high overall operating and maintenance costs, hindering the long-term stable operation of the system and the achievement of energy conservation and emission reduction goals.

[0004] When conventional roller screens are used directly for screening high-temperature materials, significant technical bottlenecks arise. On the one hand, the high-temperature materials are in prolonged contact with the rollers, and heat is gradually transferred through the roller body to the bearings at both ends of the roller. This can easily cause deterioration of the lubricating grease, changes in bearing clearance, and fatigue damage, severely shortening the service life of the bearings and roller assembly, and even leading to failures such as roller jamming or burning. On the other hand, some existing improvement solutions only reduce the temperature by increasing the heat resistance of the materials or by simply setting up a water-cooling structure on the outside of the bearings. However, due to the rapid heat conduction of the roller body, the long heat transfer path, and insufficient insulation measures, the overall cooling effect is limited, and it is still difficult to maintain stable operation at high material temperatures for a long period of time.

[0005] Furthermore, in existing roller screen technology, some literature proposes optimizing the roller structure to improve the wear resistance of the roller discs. For example, patent document CN221934496U discloses a roller structure for roller screens, which has a roller disc assembly composed of multiple roller discs and spacers outside the main shaft, and wear-resistant rods are embedded inside the roller discs to improve the wear resistance of the roller discs and reduce the maintenance frequency. This type of solution mainly addresses the problem of severe roller disc wear, extending the service life of the roller shaft by improving the roller disc structure, and is suitable for material screening under normal temperature conditions.

[0006] In the high-temperature operation of roller-type equipment, various cooling structures for roller bearing housings have been proposed in the prior art to reduce heat transfer to the bearings and extend their service life. For example, patent document CN205289691U discloses a cooling water channel formed by a combination of oblique and straight holes inside the bearing housing, allowing cooling water to flow close to the bearing area, thereby improving heat exchange efficiency. Furthermore, documents such as "Water-cooled Bearing Housing for Furnace Roller Conveyor" (document CN200944004Y) and "Cooling Device for Heating Furnace Roller Conveyor Bearing Housing" (document CN217633509U) also propose setting cooling water chambers or cooling pipes inside the bearing housing of the roller conveyor, allowing the bearing housing to be cooled by circulating water in a high-temperature environment, thereby suppressing bearing temperature rise and improving the operational stability of the roller conveyor system. The aforementioned existing technologies only achieve heat dissipation by improving the internal water channel structure of the bearing housing, without considering the heat insulation problem of the roller surface, and are not suitable for screening structures with multiple rollers closely arranged. Moreover, the heat of high-temperature materials can still be easily conducted to the bearing area, resulting in a large cooling load and making it difficult to meet the stability and overall heat resistance required for continuous hot material screening. Therefore, there is an urgent need in the field for a heat-resistant roller screen with a relatively simple structure that can reduce heat transfer from the source, effectively cool the roller bearings, and is suitable for high-temperature material conditions. Utility Model Content

[0007] The technical problem to be solved by this utility model is to overcome the existing defects and provide a new type of heat-resistant roller screen, which can realize the screening of hot materials using heat-resistant roller screen, while still having the advantages of high screening efficiency, stable and reliable operation, and low maintenance cost; moreover, it can make the screening system more meet the requirements of high efficiency and cost saving, and can effectively solve the problems in the background technology.

[0008] To achieve the above objectives, this utility model provides the following technical solution: A novel heat-resistant roller screen includes a screen box, rollers, and an annular cooling bearing seat. Several rollers are arranged in parallel within the screen box. Both ends of the rollers are connected to the annular cooling bearing seat. A heat-insulating sleeve and a roller disc are fitted onto the rollers. The heat-insulating sleeve and roller disc are spaced apart. The heat-insulating sleeve significantly reduces heat transfer to the inside of the rollers and towards the bearing, thereby improving the screening performance of the rollers in high-temperature environments. The rollers have long grooves along the circumference and axial direction. These grooves serve to connect the roller discs and form a hollow structure with the heat-insulating sleeve. The axially extending cavity inside the groove reduces heat transfer to the bearing. The heat-insulating sleeve is slidably connected to the long groove. End retainers are provided at both ends of the rollers. The retaining sleeve abuts against the roller disc via an elastic element, and the end retaining sleeve is fixedly connected to the roller shaft by locking bolts. Each annular cooling bearing housing is interconnected via cooling water pipes. The annular cooling bearing housings at both ends are respectively connected to cooling water inlet pipes and cooling water outlet pipes. The annular cooling bearing housings, cooling water inlet pipes, and cooling water outlet pipes together constitute a cooling water system. This cooling water system cools the bearings at both ends of the roller shaft, enabling the roller screen to screen high-temperature materials. This heat-resistant roller screen achieves heat resistance through a combination of two methods: firstly, it fundamentally reduces heat transfer, and secondly, it uses cooling water to cool the bearings, thereby achieving high-temperature resistance. In addition, the heat insulation sleeve not only has the ability to withstand high temperatures and provide heat insulation, but also protects the roller shaft and extends its service life.

[0009] It also includes a circulating water pump, a water tank, a main inlet pipe, a main return pipe, and branch water pipes that are connected to the inlet and outlet of each annular bearing housing. Cooling water is pumped into each annular bearing housing by the circulating water pump, and after heat exchange through the internal cooling water channel, it flows back to the water tank through the outlet.

[0010] Furthermore, a base is provided below the screen box, and a feed chute is provided on the left side of the screen box.

[0011] Furthermore, the insulation sleeve is made of zirconia ceramic or silicon carbide composite ceramic material.

[0012] Furthermore, it also includes a three-phase asynchronous motor and a reducer. The three-phase asynchronous motor drives the reducer to output low-speed torque. The output shaft of the reducer is fixedly connected to at least one roller shaft and drives the remaining roller shafts to rotate through a coupling or transmission mechanism. The other roller shafts can be driven to rotate through gear transmission, sprocket transmission or synchronous belt transmission, thereby realizing the synchronous or equal speed rotation of multiple roller shafts.

[0013] Furthermore, the roller disc is set to an elliptical shape.

[0014] Furthermore, the elastic element is a spring pad or a disc spring.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model enables the roller screen to operate stably at high material temperatures by setting a heat insulation structure on the roller surface and combining bearing seat cooling with the roller body's reduced heat transfer. The heat insulation layer effectively blocks the transfer of material heat to the inside of the roller, and the special structure of the roller body reduces heat accumulation. Combined with the cooling water circulation channel inside the bearing seat, the bearing operating temperature is controlled within a reasonable range. This fundamentally solves the problem that traditional roller screens are difficult to use for hot material screening, and greatly improves the equipment's heat resistance and operational stability.

[0016] 2. By setting a heat insulation sleeve on the outer periphery of the roller shaft, forming a hollow or heat-reducing structure on the roller shaft, and forming a cooling water channel close to the bearing area in the bearing housing, this utility model constructs a comprehensive structural layout that coordinates heat dissipation and heat insulation. On the one hand, the heat insulation sleeve has both high temperature resistance and wear resistance, which reduces heat conduction inward and protects the roller shaft body. On the other hand, the cooling water channel inside the bearing housing works in conjunction with the circulating cooling system to continuously remove heat from the vicinity of the bearing, significantly extending the service life of the bearing and roller shaft assembly, and reducing the frequency of downtime and maintenance due to bearing overheating.

[0017] 3. The equipment has a compact overall structure, which makes it easy to be arranged and modified in the existing production line without requiring a significant increase in space or complex auxiliary facilities. At the same time, the improved lifespan of core components and the reduction in maintenance frequency help to reduce spare parts consumption and labor maintenance costs, and shorten downtime. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the roller structure inside the screen box of this utility model; Figure 3 This is an isometric drawing of the roller shaft of this utility model; Figure 4 This is a schematic diagram of the roller shaft end sleeve removal structure of this utility model; Figure 5 This is a partial schematic diagram of the cross-section of the roller shaft of this utility model; Figure 6 This is a schematic diagram of the water pipe connection structure of the annular cooling bearing seat of this utility model.

[0019] In the diagram: 1. Feed chute, 2. Screen box, 3. Base, 4. Reducer, 5. Three-phase asynchronous motor, 6. Roller shaft, 7. Ring bearing seat, 8. Cooling water inlet pipe, 9. End sleeve, 10. Elastic element, 11. Heat insulation sleeve, 12. Roller disc, 13. Locking bolt, 14. Long groove, 15. Cooling water outlet pipe. Detailed Implementation

[0020] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example 1

[0021] Please see Figure 1-6 This utility model provides a technical solution: a novel heat-resistant roller screen, comprising a screen box 2, a base 3, a feed chute 1, several rollers 6, annular cooling bearing seats 7, a cooling water inlet pipe 8, a cooling water outlet pipe 15, an end sleeve 9, an elastic element 10, a heat insulation sleeve 11, a roller disc 12, a locking bolt 13, a long groove 14, and components such as a three-phase asynchronous motor 5 and a reducer 4; the screen box 2 is mounted on the base 3, and the feed chute 1 is located on one side of the screen box 2, through which high-temperature materials enter the interior of the screen box 2; several rollers 6 are arranged in parallel within the screen box 2 along the material's forward direction, with screening gaps formed between adjacent rollers 6 to achieve material grading and screening; both ends of each roller 6 are respectively mounted in the corresponding annular cooling bearing seats 7 via bearings, forming a rotating support structure for the roller 6.

[0022] A heat insulation sleeve 11 and a roller disc 12 are fitted around the outer periphery of each roller shaft 6. The heat insulation sleeve 11 and the roller disc 12 are arranged at intervals along the axial direction of the roller shaft. The roller disc 12 is preferably elliptical to enhance the turning and conveying capacity of the material. A long groove 14 is formed along the axial direction of the circumference of the roller shaft 6. The long groove 14 is used to cooperate with the roller disc 12 to realize the positioning and connection of the roller disc 12 on the roller shaft 6. On the other hand, the long groove 14 and the outer heat insulation sleeve 11 together form a hollow structure, so that the roller shaft locally forms a cavity extending along the axial direction to reduce the heat transfer to the bearing direction. The heat insulation sleeve 11 is preferably made of zirconia ceramic or silicon carbide composite ceramic material, which has good performance. It has high temperature resistance and heat insulation properties, and also has a certain degree of wear resistance, which can protect the surface of the roller shaft 6. The heat insulation sleeve 11 and the long groove 14 have a sliding connection structure, which is convenient for assembly and can adapt to small thermal expansion displacement under high temperature conditions. End sleeves 9 are respectively provided at both ends of the roller shaft 6. The end sleeves 9 abut against the outermost roller disc 12 through the elastic element 10. The elastic element 10 can be a spring washer or a disc spring. The end sleeves 9 are then fixedly connected to the roller shaft 6 through the locking bolts 13, thereby forming an elastic pre-tightening on the heat insulation sleeve 11 and the roller disc 12 in the axial direction, which not only ensures the reliable positioning of each component, but also absorbs the dimensional changes caused by thermal expansion and prevents loosening or jamming.

[0023] Each annular bearing housing 7 is connected in sequence by pipelines. The two ends of the annular bearing housing 7 are respectively connected to the cooling water inlet pipe 8 and the cooling water outlet pipe 15. The annular bearing housing 7, the cooling water inlet pipe 8 and the cooling water outlet pipe 15 together constitute a cooling water system. In actual use, it can also be connected to a circulating water pump, a water tank, a main inlet pipe and a main return pipe, so that the cooling water is sent by the circulating water pump into the cooling water channel inside each annular bearing housing 7. After flowing along the water path close to the outer ring of the bearing and carrying away the heat of the bearing area, it flows back to the water tank through the cooling water outlet pipe 15, forming a closed-loop cooling circuit, thereby effectively controlling the bearing working temperature. The three-phase asynchronous motor 5 drives the reducer 4 through a coupling. The reducer 4 outputs low speed and high torque. Its output shaft is fixedly connected to at least one roller shaft 6. Other roller shafts 6 can achieve synchronous or constant speed rotation through gear transmission, sprocket transmission or synchronous belt transmission, so that multiple roller shafts 6 together form a continuous screening and conveying channel.

[0024] During operation, high-temperature materials fall from the feed chute 1 into the screen box 2 and onto several rotating rollers 6. Driven by the roller disc 12, the materials move forward along the direction of the roller arrangement and are constantly tumbling. Materials smaller than the gap between adjacent rollers 6 fall through the gap and are screened, while materials larger than the gap continue to be discharged forward, achieving effective screening of high-temperature materials. Due to the heat insulation sleeve 11 set on the outer periphery of the roller and the hollow structure formed by the long groove 14, the conduction of heat from the material to the inside of the roller and the bearing direction is significantly reduced. At the same time, the cooling water channel inside the annular cooling bearing seat 7 continuously cools the bearing, so that the roller screen can still keep the bearing temperature within a safe range when processing high-temperature materials, avoiding lubrication failure and bearing burnout, ensuring long-term stable operation of the whole machine, and taking into account the advantages of compact structure, convenient maintenance and long service life.

[0025] The foregoing has shown and described the basic principles, main features and advantages of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. A novel heat-resistant roller screen, comprising a screen box (2), a roller (6), and an annular cooling bearing seat (7), characterized in that: Several rollers (6) are arranged in parallel in the screen box (2). The two ends of the rollers (6) are respectively connected to the ring bearing seat (7). A heat insulation sleeve (11) and a roller disc (12) are fitted on the rollers (6). The heat insulation sleeve (11) and the roller disc (12) are spaced apart. A long groove (14) is provided along the axial direction in the circumferential direction of the rollers (6). The heat insulation sleeve (11) and the long groove (14) are slidably connected. End retainers are provided at both ends of the rollers (6). 9) The end sleeve (9) abuts against the roller disc (12) through the elastic element (10). The end sleeve (9) and the roller shaft (6) are fixedly connected by the locking bolt (13). The annular cooling bearing seats (7) are connected by pipelines. The annular cooling bearing seats (7) at both ends are respectively connected to the cooling water inlet pipe (8) and the cooling water outlet pipe (15). The annular cooling bearing seats (7), the cooling water inlet pipe (8) and the cooling water outlet pipe (15) together constitute the cooling water system.

2. The novel heat-resistant roller screen according to claim 1, characterized in that: A base (3) is provided below the screen box (2), and a feed chute (1) is provided on the left side of the screen box (2).

3. The novel heat-resistant roller screen according to claim 1, characterized in that: The heat insulation sleeve (11) is made of zirconia ceramic or silicon carbide composite ceramic material.

4. The novel heat-resistant roller screen according to claim 1, characterized in that: It also includes a three-phase asynchronous motor (5) and a reducer (4). The three-phase asynchronous motor (5) drives the reducer (4) to output low-speed torque. The output shaft of the reducer (4) is fixedly connected to at least one roller shaft (6) and drives the remaining roller shafts (6) to rotate through any one of gear transmission, sprocket transmission or synchronous belt transmission.

5. A novel heat-resistant roller screen according to claim 1, characterized in that: The roller (12) is set to be elliptical.

6. A novel heat-resistant roller screen according to claim 1, characterized in that: The elastic element (10) is a spring pad or a disc spring.

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