A double head flight conveyor for semi-coke

Abstract

The utility model relates to a kind of double head scrapers for semi-coke conveying, to solve the technical problem of current scraper mechanical failure, serious wear and tear. Including lower bottom plate, transmission chain, scraper, head transmission mechanism, tail transmission mechanism, the scraper is connected transmission chain, head transmission mechanism and tail transmission mechanism traction transmission chain form closed loop, the head transmission mechanism includes primary drive transmission shaft, secondary drive transmission shaft, interval baffle roller, the secondary drive transmission shaft is set below primary drive transmission shaft, the interval baffle roller is set above secondary drive transmission shaft, the both ends of primary drive transmission shaft are connected primary drive sprocket, the both ends of secondary drive transmission shaft are connected secondary drive sprocket, the both ends of interval baffle roller are connected baffle roller sprocket, secondary drive sprocket, baffle roller sprocket and primary drive sprocket are sequentially engaged with transmission chain along the direction of transmission chain travel transmission.

Description

Technical Field

[0001] This utility model belongs to the field of semi-coke material conveying and is applied to the conveying of semi-coke products in the coking, magnesium smelting, coal and steel industries; in particular, it relates to a double-head scraper conveyor for semi-coke conveying. Background Technology

[0002] Ordinary mining scraper conveyors face severe challenges when conveying high-temperature materials such as semi-coke and coke. Under harsh conditions of high temperature, high humidity, and corrosive media containing ammonia, critical components of the equipment experience exceptionally severe wear. In particular, the curved section of the bottom plate suffers from vertical pressure concentration due to structural design flaws. The curved section of traditional scraper conveyors typically involves a sharp 90° turn, causing point / line contact between the chain and the bottom plate at the corner, concentrating vertical pressure in a localized area. The chain of traditional scraper conveyors is deformed at the pressure concentration point, with only a few chain links actually in contact with the wear-resistant strips. The contact surface is merely a "line" or a very narrow "band," resulting in significantly insufficient contact area with the wear-resistant strips, leading to localized wear ≥1.5mm / month. More seriously, the continuous direct friction between the chain and the wear-resistant strips generates a severe abrasive wear effect, and the corrosive media in the high-temperature environment further accelerates the material loss process, creating a vicious cycle of erosion. Simultaneously, material characteristics and structural defects jointly contribute to frequent operational failures. Due to the viscous properties of high-temperature materials and the presence of high-hardness particles, stubborn material accumulation easily forms in the head sprocket area. Continued accumulation can completely block the flow channel and forcefully trigger a shutdown protection mechanism. During the return journey, fine coke particles can also intrude into the sprocket meshing gap, causing the chain to instantly jump off the track and derail, potentially leading to breakage. These cascading failures severely limit the actual operating status of the equipment, keeping the uptime rate consistently below 75%. Maintenance shutdowns not only directly reduce conveying capacity but also cause an abnormal surge in energy consumption due to frequent restarts, resulting in a double loss of insufficient conveying capacity and energy waste.

[0003] Current localized material upgrades have proven to be limited in effectiveness, failing to simultaneously address root causes such as uneven pressure distribution, defects in interfacial friction mechanisms, and lack of corrosion protection. Rapid wear of the wear-resistant strips not only incurs high replacement costs but also leads to a continuous deterioration in equipment operational stability. Therefore, a comprehensive upgrade solution encompassing structural design, material selection, and functional optimization is urgently needed to improve equipment reliability. Utility Model Content

[0004] This utility model provides a double-head scraper conveyor for semi-coke conveying, which solves the technical problems of frequent mechanical failures and severe wear in current scraper conveyors.

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

[0006] A double-head scraper conveyor for semi-coke conveying includes a lower base plate, a drive chain, scrapers, a head drive mechanism, and a tail drive mechanism. The scrapers are connected to the drive chain, and the head and tail drive mechanisms pull the drive chain to form a closed loop. The head drive mechanism includes a primary drive shaft, a secondary drive shaft, and intermediate stop rollers. The secondary drive shaft is located below the primary drive shaft, and the intermediate stop rollers are located above the secondary drive shaft. The two ends of the primary drive shaft are connected to primary drive sprockets, the two ends of the secondary drive shaft are connected to secondary drive sprockets, and the two ends of the intermediate stop rollers are connected to stop roller sprockets. The secondary drive sprockets, stop roller sprockets, and primary drive sprockets sequentially mesh with the drive chain along the direction of travel of the drive chain.

[0007] The transmission chain has a horizontal section and a ramp section. The angle between the horizontal section and the ramp section of the upward transmission chain is 22°-27°. The angle between the horizontal section and the ramp section of the downward transmission chain is 30°-38°. The bottom plate is parallel to the upward transmission chain at the bottom of the upward transmission chain.

[0008] A lower sprocket is provided between the horizontal section and the ramp section of the upward transmission chain for guidance, and an upper sprocket is provided between the horizontal section and the ramp section of the downward transmission chain for guidance.

[0009] A cover plate is provided above the horizontal section of the downward transmission chain, and the cover plate is provided with multiple feed ports. A top cover plate parallel to the slope section of the downward transmission chain is also provided above it.

[0010] Both the primary drive shaft and the secondary drive shaft are equipped with a motor, a reducer, a coupling, a coupler, and a brake.

[0011] Compared with existing technologies, the beneficial effects of this utility model are:

[0012] 1. Significantly Reduced Wear Rate: By adding a secondary drive sprocket and designing a 3%–5% speed gradient for it, active tension is generated when the chain passes through the turning zone of the lower sprocket, optimizing load distribution. Combined with the conjugate constraint formed by the guide roller sprocket and the intermediate guide roller, the radial offset of the chain is controlled within ≤2mm. Simultaneously, the arc angles of the downward drive chain (30°–38°) and the upward drive chain (22°–27°) are optimized. This optimization allows the chain to transition with a gentle slope, reducing the impact angle between the chain and the base plate during turning, increasing the contact area, and distributing concentrated loads into uniform loads, thus solving the structural defect of concentrated vertical pressure in traditional equipment. The gentle arc angle allows the chain to contact the wear-resistant strip with an inclined surface, increasing the contact length, and ensuring that all chain links on the entire inclined section are in contact with the wear-resistant strip. This increases the contact area of ​​the wear-resistant strip, and actual measurements show that the wear rate has decreased from ≥1.5mm / month in the background technology to below 0.1mm / month, extending the equipment lifespan by 2 times.

[0013] 2. Significantly reduced operational failures: The most common operational failures are material blockage and chain derailment. This invention adopts a dual-drive sprocket traction mechanism to ensure operational stability, and combined with the angle design of the arc section (30°-38° in the upper section and 22°-27° in the lower section), it ensures that the material maintains a reasonable sliding speed in the head sprocket area; at the same time, the rigid constraint of the chain on the side by the interstitial rollers effectively prevents coke particles from entering the sprocket meshing gap, completely eliminating the risk of jumping off the trough and derailing, and significantly reducing forced shutdown accidents caused by blockage.

[0014] 3. Substantial improvement in continuous operation cycle: The active tension force generated by the secondary drive speed gradient works in synergy with the thermal elongation compensation of the tensioning component to form a dynamic balance; the closed-loop transmission design of the end sprocket / upper and lower sprocket meshing and the staged braking significantly improve the uptime and extend the continuous operation time of the equipment.

[0015] 4. Overall improvement in system reliability: Optimization of speed gradient, radial offset, arc angle, thermal compensation tension and staged braking reduces abrasive wear and unstable conveying, resulting in a significant increase in the overall failure interval. Attached Figure Description

[0016] Figure 1 This is the front view of the scraper conveyor of this utility model.

[0017] Figure 2 This is a top view of the scraper conveyor.

[0018] Figure 3 This is a schematic diagram of the scraper structure.

[0019] Figure 4 This is a side view of the sprocket structure.

[0020] Figure 5 This is the front view of the sprocket structure.

[0021] In the diagram: 1. End sprocket; 2. Feed inlet; 3. Drive chain; 3-1 Upward drive chain; 3-2 Downward drive chain; 4. Scraper; 5. Upper sprocket; 6. Lower sprocket; 7. Primary drive sprocket; 8. Arc-shaped section of lower base plate; 9. Secondary drive sprocket; 10. Hopper; 11. Upper cover plate; 12. Motor; 13. Hopper shell; 14. Baffle roller sprocket; 14-1. Gear ring; 14-2. Hub; 14-3. Shaft hole; 15. Hopper outlet; 16. Interval roller; 17. Primary drive shaft; 18. Secondary drive shaft; 19. Lower base plate; 20. Reducer; 21. Coupling; 22. Coupler; 23. Scraper; 24. Brake. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to embodiments. The following description is only for explaining the present invention and does not limit its content. Unless otherwise specified, the experimental methods used in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0023] A double-head scraper conveyor for semi-coke conveying includes a lower base plate 19, a transmission chain 3, scrapers 4, a head transmission mechanism, and a tail transmission mechanism. The scrapers 4 are connected to the transmission chain 3. The head transmission mechanism and the tail transmission mechanism pull the transmission chain 3 to form a closed loop. The head transmission mechanism includes a primary drive shaft 17, a secondary drive shaft 18, and a stop roller 16. The secondary drive shaft 18 is located below the primary drive shaft 17, and the stop roller 16 is located above the secondary drive shaft 17. The two ends of the primary drive shaft 17 are connected to primary drive sprockets 7, the two ends of the secondary drive shaft 18 are connected to secondary drive sprockets 9, and the two ends of the stop roller 16 are connected to stop roller sprockets 14. The secondary drive sprockets 9, the stop roller sprockets 14, and the primary drive sprockets 7 sequentially mesh with the transmission chain 3 along the direction of transmission chain travel.

[0024] The transmission chain 3 has a horizontal section and a ramp section. The angle between the horizontal section and the ramp section of the upward transmission chain 3-1 is 22°-27°. The angle between the horizontal section and the ramp section of the downward transmission chain 3-2 is 30°-38°. The bottom plate 19 is parallel to the upward transmission chain 3-1 at the bottom of the upward transmission chain 3-1.

[0025] A lower sprocket 6 is provided between the horizontal section and the ramp section of the upward transmission chain 3-1 for guidance, and an upper sprocket 5 is provided between the horizontal section and the ramp section of the downward transmission chain 3-2 for guidance.

[0026] A cover plate is provided above the horizontal section of the downward transmission chain 3-2, and the cover plate has multiple feed ports 2. An upper cover plate 11 is also provided above the inclined section of the downward transmission chain 3-2, parallel to it. The upper cover plate 11 is connected to the cover plate.

[0027] Both the primary drive shaft 17 and the secondary drive shaft 18 are equipped with a motor 12, a reducer 20, a coupling 21, a coupler 22, and a brake 24.

[0028] The present invention relates to a double-head scraper conveyor for semi-coke conveying, which mainly comprises a transmission unit, a feeding unit, and a drive unit.

[0029] The transmission unit consists of a transmission chain 3, an end sprocket 1, an upper sprocket 5, a lower sprocket 6, an intermediate stop roller 16, a stop roller sprocket 14, a primary drive sprocket 7, a secondary drive sprocket 9, and corresponding bearings and tensioning components for each part.

[0030] The end sprocket 1, upper sprocket 5, lower sprocket 6, intermediate stop roller 16, stop roller sprocket 14, primary drive sprocket 7, and secondary drive sprocket 9 are connected by a transmission chain 3 and rotate in the same direction during operation.

[0031] The feeding unit consists of an inlet 2, a scraper 4, a scraper rod 23, an upper cover plate 11, and a lower base plate 19. The lower base plate 19 is divided into a horizontal section and an uphill section, connected in the middle by an arc-shaped section 8. The angle formed by the upper cover plate 11 and the horizontally positioned cover plate is the same as the angle between the horizontal and uphill sections of the downward transmission chain 3-2, which is 30°–38°. The angle at the arc-shaped section 8 of the lower base plate is the same as the angle between the horizontal and uphill sections of the upward transmission chain 3-1, which is 22°–27°. The scraper 4 is fixedly connected to the scraper rod 23, and the scraper rod 23 is fixedly connected to the transmission chain 3. The inlet 2 is located on the cover plate.

[0032] The drive unit consists of a primary drive and a secondary drive, both of which are composed of a motor 12, a coupler 22, a brake 24, a reducer 20, a coupling 21, etc.

[0033] The operation of a scraper conveyor includes five stages: drive start-up, transmission chain movement, material conveying, chain tension maintenance, and shutdown control.

[0034] Drive start-up phase: The output shaft of the motor 12 of the first-stage drive unit is connected to the input end of the reducer 20 via the coupler 22. The output end of the reducer 20 drives the first-stage drive sprocket 7 to rotate via the coupling 21. Simultaneously, the second-stage drive unit drives the second-stage drive sprocket 9 to rotate along the same transmission path. The pitch circle linear velocity of the second-stage drive sprocket 9 is maintained at 6-10 m / s, and should always be higher than the linear velocity of the first-stage drive sprocket 7 by 5.7-9.5 m / s, with a speed gradient of 2%–5%.

[0035] In the transmission chain motion stage: the primary drive sprocket 7 and the secondary drive sprocket 9 rotate in the same direction, pulling the transmission chain 3 to form a closed motion loop; the transmission chain 3 synchronously meshes with the end sprocket 1, upper sprocket 5, lower sprocket 6, and stop roller sprocket 16, driving each sprocket to rotate synchronously; the stop roller 16 is a non-transmission roller, with stop roller sprockets 14 installed at both ends to mesh with the chain, and the roller surface is in close contact with the side of the chain. The stop roller sprockets 14 restrict the longitudinal runout of the chain; the radial offset of the chain is limited to ≤2mm. The roller surface of the stop roller 16 physically contacts and constrains the lateral offset of the chain, preventing coke particles from entering the sprocket meshing gap and avoiding chain skipping and derailment.

[0036] During the material conveying stage, the semi-coke falls into the lower base plate 19 through the feed inlet 2. The scraper 4, which is fixed to the transmission chain 3, moves linearly with the chain, pushing the semi-coke along the plane of the lower base plate 19. The scraper 4 travels at a speed of 0.5-2 m / s. The semi-coke is then discharged after passing through the arc section 8 of the lower base plate to the uphill section of the lower base plate 19.

[0037] During the chain tension maintenance phase, the speed gradient of the secondary drive sprocket 9 causes the transmission chain 3 to generate active tension when it passes through the turning section of the lower sprocket 6; the stop roller sprocket 14 and the intermediate stop roller 16 together limit the chain radially and laterally, the sprocket teeth meshing controls the radial runout, and the roller surface of the intermediate stop roller 16 controls the lateral offset, ensuring uniform tension distribution and achieving stable tension balance.

[0038] During the shutdown control phase, brake 24 applies braking torque to the output shaft of the first-stage drive unit; the second-stage drive unit activates the brake after a delay of 1.0 ± 0.5 seconds to work together to eliminate the inertial displacement of the transmission chain 3.

[0039] Example 1:

[0040] This scraper conveyor is implemented on a semi-coke conveyor line in a coking plant. The angle between the upper cover plate 11 and the horizontal cover plate plane is set to 35°, and the angle at the arc section 8 of the lower bottom plate is 25°. When the equipment starts, the output shaft of the motor 12 of the first-stage drive unit is connected to the reducer 20 via the coupler 22. The output end of the reducer 20 drives the first-stage drive sprocket 7 to rotate at a linear speed of 7.00 m / s via the coupling 21. Simultaneously, the second-stage drive unit drives the second-stage drive sprocket 9 to run at a linear speed of 7.28 m / s, with a speed gradient of 4.0%. The transmission chain 3 forms a closed motion loop under the traction of the dual drive sprockets, synchronously meshing with the end sprocket 1, upper sprocket 5, lower sprocket 6, and the retaining roller sprocket 14. The roller surface of the intermediate retaining roller 16 is in continuous contact with the side of the transmission chain 3, forming a constraint with the retaining roller sprocket 14. Semi-coke material falls into the lower base plate 19 of the scraper conveyor through the feed inlet 2. The scraper 4, fixed to the transmission chain 3, pushes the material along the plane of the lower base plate 19 at a speed of 0.8 m / s via the scraper rod 23, and exits through the hopper outlet 15 via the uphill section of the lower base plate 19. Real-time monitoring shows that the radial offset of the transmission chain 3 is ≤1.5 mm. When the machine stops, the brake 24 applies braking torque to the primary drive shaft 17, and activates the secondary drive unit brake after a 1.0 second delay. After 720 hours of continuous operation, the maximum wear depth of the arc section 25 of the upper base plate is 0.08 mm, and no chain skipping or material blockage occurs. This represents a significant improvement compared to the previous condition where the monthly wear was ≥1.5 mm.

[0041] Example 2:

[0042] In a semi-coke conveying system of a steel enterprise with 40% coke content, an upper cover plate 11 with a maximum inclination angle of 38° and a lower bottom plate arc section 8 with an inclination angle of 22° are used. The linear speed of the secondary drive sprocket 9 is set to 7.35 m / s, the primary sprocket to 7.00 m / s, and the speed gradient to +5.0%. The drive chain 3 pulls the end sprocket 1 and the lower sprocket 6. After the material enters through the feed inlet 2, the scraper 4 forms an efficient material guide at the 22° lower bottom plate arc section 8 (gentle slope). The 38° arc section angle effectively suppresses the impact of the empty scraper on the bottom plate after unloading. During shutdown operations, the secondary drive delay braking time is adjusted to 1.5 seconds, successfully eliminating chain rebound in the turning area. After 720 hours of operation, the temperature of the sprocket meshing tooth surface remained stable below 110℃, the replacement cycle of wear-resistant strips was extended from 15 days to 180 days, the material blockage failure rate was reduced to zero, and the equipment uptime increased from 75% to 98%.

Claims

1. A double-head scraper conveyor for semi-coke conveying, comprising a lower base plate, a drive chain, scrapers, a head drive mechanism, and a tail drive mechanism, wherein the scrapers are connected to the drive chain, and the head drive mechanism and the tail drive mechanism pull the drive chain to form a closed loop, characterized in that... The head drive mechanism includes a primary drive drive shaft, a secondary drive drive shaft, and a stop roller. The secondary drive drive shaft is located below the primary drive drive shaft, and the stop roller is located above the secondary drive drive shaft. The two ends of the primary drive drive shaft are connected to primary drive sprockets, the two ends of the secondary drive drive shaft are connected to secondary drive sprockets, and the two ends of the stop roller are connected to stop roller sprockets. The secondary drive sprocket, the stop roller sprocket, and the primary drive sprocket sequentially mesh with the drive chain along the direction of the drive chain.

2. The double-head scraper conveyor for semi-coke conveying according to claim 1, characterized in that, The transmission chain has a horizontal section and a ramp section. The angle between the horizontal section and the ramp section of the upward transmission chain is 22°-27°. The angle between the horizontal section and the ramp section of the downward transmission chain is 30°-38°. The bottom plate is parallel to the upward transmission chain at the bottom of the upward transmission chain.

3. A double-head scraper conveyor for semi-coke conveying according to claim 2, characterized in that, A lower sprocket is provided between the horizontal section and the ramp section of the upward transmission chain for guidance, and an upper sprocket is provided between the horizontal section and the ramp section of the downward transmission chain for guidance.

4. A double-head scraper conveyor for semi-coke conveying according to claim 2, characterized in that, A cover plate is provided above the horizontal section of the downward transmission chain, and the cover plate is provided with multiple feed ports. A top cover plate parallel to the slope section of the downward transmission chain is also provided above it.

5. A double-head scraper conveyor for semi-coke conveying according to claim 1, characterized in that, Both the primary drive shaft and the secondary drive shaft are equipped with a motor, a reducer, a coupling, a coupler, and a brake.

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