A rotary kiln chain drive roller screen

Abstract

This utility model relates to a rotary kiln chain-driven roller screen, comprising a left support frame, a right support frame, a roller screen, and a bearing seat. The left and right support frames are symmetrically arranged on both sides of the roller screen, and a roller screen drive mechanism and a water-cooling mechanism are respectively provided on the outer sides of the left and right support frames. This utility model replaces the fixed screen with a rotatable drive roller screen, using the rotation of the roller screen assembly to screen out blocks coming from the kiln head; the chain drive method prevents the roller screen from jamming, ensuring reliable performance; and the water-cooling mechanism protects the roller screen and greatly improves its service life.

Description

Technical Field

[0001] This utility model relates to rotary kiln production equipment with chain grate machine, and in particular to a rotary kiln chain-driven roller screen. Background Technology

[0002] Currently, most large-scale iron ore pellet production in China adopts the chain grate rotary kiln-annular cooler method. This process has advantages such as high output, high quality, and low energy consumption.

[0003] In the pellet production process, pellets are roasted at high temperatures (around 1100℃) in a rotary kiln. Due to the rotation and tilt of the kiln, the pellets fall onto the fixed screen and are cooled on the annular cooler trolley through the gaps (typically 200mm apart). Due to the high-temperature sintering, large sintered pieces inevitably fall onto the fixed screen. Initially, these agglomerated pieces were manually removed or removed by forklifts. While existing forklift removal equipment significantly reduces manual labor, it suffers from problems such as forklift malfunctions and high consumption of spare parts. Routine maintenance of the forklift equipment is also challenging. Forklift hooks are prone to bending and deformation at high temperatures, requiring multiple spare hooks. Furthermore, during concentrated pellet removal, the forklifts' limited maneuverability can prevent timely removal of pieces from the fixed screen, causing kiln head blockage and necessitating a reduction in kiln speed, thus impacting production.

[0004] Furthermore, the existing fixed screen beam and support structure is unreasonable. Due to the high temperature of the agglomerated blocks (up to 1200℃), the spacing between the fixed screens in the original rotary kiln is generally 200-240mm. Blocks smaller than 200mm or flat blocks enter the annular cooler. The large size and number of blocks make manual cleaning extremely difficult and dangerous. Additionally, small blocks trapped between the fixed screens can easily have their protective sleeves (U-shaped, directly fitted onto the fixed screen to protect it) removed by forklifts, causing equipment damage and requiring shutdown for repair and replacement, thus disrupting the pellet plant's continuous production. Utility Model Content

[0005] The purpose of this utility model is to provide a rotary kiln chain-driven roller screen, which uses a rotating roller screen group to screen out the sintered blocks coming down from the kiln head through the rotation of the roller screen group.

[0006] A rotary kiln chain-driven roller screen includes a left support frame, a right support frame, a roller screen, and a bearing housing. The left and right support frames are symmetrically arranged on both sides of the roller screen, and a roller screen drive mechanism and a water-cooling mechanism are respectively provided on the outer sides of the left and right support frames.

[0007] The roller screen is a roller screen group consisting of several roller shafts and a protective sleeve fitted outside the roller shafts. The roller shafts are hollow roller shafts that are closed at one end and open at the other end. Several bearing seats are fixed outside the left support frame and the right support frame respectively. The left and right ends of each roller shaft extend out of the left support frame and the right support frame through the bearing seats and are rotatably connected to the left support frame and the right support frame.

[0008] The roller screen drive mechanism is located at the outer end of the left support frame and consists of a motor, a reducer, a coupling, several sprockets, and chains. Single sprockets are installed at the sealed ends of the roller shafts on both sides of the roller screen, and double sprockets are installed at the sealed ends of the remaining middle roller shafts. The first single sprocket is driven by the first double sprocket through a sleeved single chain. Starting from the first double sprocket, each adjacent double sprocket is driven by a sleeved double chain until the last single sprocket is driven by the sprocket of the last double sprocket through a single chain. The output shaft of the motor is connected to the reducer shaft, and the reducer is connected to the single sprocket at the edge of the left support frame through a coupling.

[0009] The water-cooling mechanism is located at the outer end of the right support frame and consists of a main inlet pipe, several inlet water pipes connected to the main inlet pipe, a main return pipe, and several return water boxes connected to the main return pipe. Several water outlets are opened on the main inlet pipe. The several inlet water pipes are composed of long water conveying pipe sections with a diameter smaller than that of the hollow roller shaft and short curved pipe sections connected in one piece. The return water boxes are straight pipe return water boxes. Each return water box has two holes of different diameters opened radially. The outer end hole matches the inlet water pipe, and the inner end hole is larger than the roller shaft. The long water conveying pipe sections of the several inlet water pipes pass through the outer end hole and the inner end hole respectively and extend into the roller shaft. The short curved pipes are respectively connected to the water outlets opened on the main inlet pipe. The open end of each roller shaft is inserted into the inner end hole of the return water box.

[0010] As a further description of the above technical solution: the roller shaft is provided with protruding buckles at equal intervals, the outer surface of the sheath is hexagonal, the inner surface is a circular structure larger than the diameter of the roller shaft, and a groove is opened on the circular structure. The groove of the sheath is directly embedded into the protruding buckles of the roller shaft and is fixedly connected to the protruding buckles of the roller shaft.

[0011] As a further description of the above technical solution: The motor, reducer and coupling are two sets, which are respectively connected to two single sprockets at the edge of the left end support frame, forming one working and one standby.

[0012] This utility model has the following beneficial effects:

[0013] This invention replaces the fixed screen with a rotating drive roller screen, which uses the rotation of the roller screen assembly to screen out the blocks coming down from the kiln head; the chain drive method prevents the roller screen from getting stuck, ensuring reliable performance; and the water-cooling mechanism protects the roller screen and greatly improves its service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the roller screen structure;

[0016] Figure 3 This is a schematic diagram of the roller shaft structure;

[0017] Figure 4 This is a structural diagram of the sheath;

[0018] Figure 5 This is a schematic diagram of the water cooling mechanism of this utility model;

[0019] Figure 6 This is a schematic diagram of the water inlet pipe of the water cooling mechanism;

[0020] Figure 7 A schematic diagram showing the structure with the water-cooling mechanism located at the outer end of the right support frame. Detailed Implementation

[0021] This utility model will now be described in more detail with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0022] Please refer to Figures 1-7 As shown, this utility model discloses a rotary kiln chain-driven roller screen, comprising a left support frame 11, a right support frame 12, a roller screen, and a bearing seat 13. The left support frame 11 and the right support frame 12 are symmetrically arranged on both sides of the roller screen, and a roller screen drive mechanism and a water-cooling mechanism 5 are respectively provided on the outer sides of the left support frame 11 and the right support frame 12.

[0023] The roller screen is a roller screen group consisting of several roller shafts 31 and a protective sleeve 32 sleeved on the roller shafts 31. The roller shaft is a hollow roller shaft that is closed at one end and open at the other end. The roller shaft 31 is provided with protruding buckles 311 at equal intervals. The outer surface of the protective sleeve 32 is hexagonal 321, and the inner surface is a circular structure 322 larger than the diameter of the roller shaft. The circular structure has a groove 323, which is directly embedded into the protruding buckles 311 of the roller shaft and is fixedly connected to the protruding buckles of the roller shaft.

[0024] Several bearing seats 13 are fixed to the outside of the left support frame 11 and the right support frame 12 respectively. The left and right ends of each roller shaft 31 extend out of the left support frame 11 and the right support frame 12 through the bearing seats 13 and are rotatably connected to the left support frame 11 and the right support frame 12.

[0025] The roller screen drive mechanism is located at the outer end of the left support frame 11 and consists of a motor 41, a reducer 42, a coupling 43, several sprockets, and chains. Single sprockets 45 are installed at the sealed ends of the roller shafts 31 on both sides of the roller screen, and double sprockets 46 are installed at the sealed ends of the remaining intermediate roller shafts. The first single sprocket 45 is driven by the first double sprocket 46 via a sleeved single chain 44. Starting from the first double sprocket 46, each adjacent double sprocket 46 is driven by a sleeved double chain 47, until the last single sprocket 45 is driven by the last double sprocket 46 via a single chain 44. The output shaft of the motor 41 is connected to the shaft of the reducer 42, and the reducer 42 is connected to the single sprocket at the edge of the left support frame via a coupling 43. This drives the entire roller screen to rotate around its axis. The motor, reducer, and coupling described in this invention are in two sets, each connected to two single sprockets at the edge of the left support frame, forming a system of one working and one standby unit, or one set of motors and reducers driving a portion of the roller screen while the other drives the remaining portion. The chain drive system prevents the roller screen from jamming, effectively improving the overall reliability of the roller screen.

[0026] The water-cooling mechanism 5 of this utility model is located at the outer end of the right support frame 12. It consists of a main water inlet pipe 51, several water inlet branches connected to the main water inlet pipe 51, a main return water pipe 53, and several return water boxes 54 perpendicularly connected to the main return water pipe 53. Several water outlets 511 are opened on the main water inlet pipe 51. The several water inlet branches are composed of a long water conveying pipe section 522 with a diameter smaller than that of the hollow roller shaft and a short curved pipe section 521 integrally connected to the long water conveying pipe section 522. The return water box 54 is a straight pipe. The return water box 54 has two radially sized holes. The outer hole matches the inlet water pipe, and the inner hole 541 is larger than the roller shaft 31. The long water pipe sections 522 of the several inlet water pipes pass through the outer and inner holes and extend into the roller shaft 31, with the length of each long water pipe section 522 being 2 / 3 of the roller shaft 31. The short curved pipes 521 are connected to the outlets 511 on the main inlet water pipe 51. The open end of each roller shaft 31 is inserted into the inner hole 541 of the return water box. The water cooling mechanism effectively improves the service life of the roller screen.

[0027] This utility model's chain-driven roller screen, except for the roller shaft and roller screen sleeve which operate under high temperature conditions, has all other components installed on the external platform of the kiln head hood, unaffected by high temperatures. It can operate when blocks are being fed and stops operating when blocks are not being fed, at which point it functions the same as a fixed screen. The distance between the roller screens described in this utility model is 100mm or less, which can screen out broken and large pieces, significantly improving the cooling effect on the ring cooler and avoiding the block-scraping process in the ring cooler.

[0028] It should be noted that in the description of this utility model, the terms "horizontal", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" 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 simplifying the description, 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.

Claims

1. A rotary kiln chain-driven roller screen, comprising a left support frame, a right support frame, a roller screen, and a bearing housing, characterized in that, The left and right support frames are symmetrically arranged on both sides of the roller screen. A roller screen drive mechanism and a water-cooling mechanism are respectively provided on the outer sides of the left and right support frames. The roller screen is a roller screen group consisting of several roller shafts and a protective sleeve fitted outside the roller shafts. The roller shafts are hollow roller shafts that are closed at one end and open at the other end. Several bearing seats are fixed outside the left support frame and the right support frame respectively. The left and right ends of each roller shaft extend out of the left support frame and the right support frame through the bearing seats and are rotatably connected to the left support frame and the right support frame. The roller screen drive mechanism is located at the outer end of the left support frame and consists of a motor, a reducer, a coupling, several sprockets, and chains. Single sprockets are installed at the sealed ends of the roller shafts on both sides of the roller screen, and double sprockets are installed at the sealed ends of the remaining middle roller shafts. The first single sprocket is driven by the first double sprocket through a sleeved single chain. Starting from the first double sprocket, each adjacent double sprocket is driven by a sleeved double chain until the last single sprocket is driven by the sprocket of the last double sprocket through a single chain. The output shaft of the motor is connected to the reducer shaft, and the reducer is connected to the single sprocket at the edge of the left support frame through a coupling. The water-cooling mechanism is located at the outer end of the right support frame and consists of a main inlet pipe, several inlet water pipes connected to the main inlet pipe, a main return pipe, and several return water boxes connected to the main return pipe. Several outlets are opened on the main inlet pipe. Each inlet water pipe consists of a long water delivery pipe section with a diameter smaller than the hollow roller shaft and an integrally connected short curved pipe section. The return water boxes are straight pipe return water boxes, each with two radially opened holes of unequal diameter. The outer end hole matches the inlet water pipe, and the inner end hole is larger than the roller shaft. The long water delivery pipe sections of the several inlet water pipes pass through the outer and inner end holes and extend into the roller shaft. The short curved pipes are connected to the outlets on the main inlet pipe. The open end of each roller shaft is inserted into the inner end hole of the return water box.

2. The rotary kiln chain-and-sprocket drive roll screen according to claim 1, characterized in that: The roller shaft is provided with protruding buckles at equal intervals. The outer surface of the sheath is hexagonal, and the inner surface is a circular structure larger than the diameter of the roller shaft. A groove is opened on the circular structure. The groove of the sheath is directly embedded into the protruding buckle of the roller shaft and is fixedly connected to the protruding buckle of the roller shaft.

3. The rotary kiln chain and roller screen of claim 1, wherein: The motor, reducer and coupling are in two sets, which are respectively connected to two single sprockets at the edge of the left support frame, forming one working and one standby.

4. The rotary kiln chain and roller screen of claim 1, wherein: The distance between the roller screens is 100mm.

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