A sintering method for thick material layer of sintering machine trolley super-bar plate

Abstract

The present application relates to a kind of sintering machine trolley super column plate thick material layer distribution sintering method, the method includes the following steps: step 1: in the area of sintering machine multi-roller distributor drop point, set movable material baffle, step 2: form trapezoidal slope by movable material baffle;Step 3: adjustable counterweight sieve-shaped material pressing device is set in the two sides of trapezoidal slope;Step 4: prolong the residence time of shuttle distribution trolley drop point at the edge of mixed material bin;Step 5: increase the length of two side flame of igniter step 6: improve the structure of igniter nozzle.This scheme realizes super column plate thick material layer sintering production, and solves the problems such as mixed material overflow from the two sides of trolley, increased return ore rate and environmental pollution etc..At the same time, by improving the distribution and ignition method of sintering machine, slow down the edge effect of the two sides of trolley, reduce the unevenness of super column plate distribution along the transverse vertical sintering speed of trolley, increase the strength and yield of sinter, and can effectively reduce the concentration of pollutant emission in sintering flue gas.

Description

Technical Field

[0001] This invention relates to a sintering method, specifically a sintering method for a thick material layer on a sintering machine trolley with a super-thick material layer, belonging to the field of sintering technology in iron and steel metallurgy. Background Technology

[0002] In recent years, thick-layer sintering has become the mainstream of sintering technology development. Utilizing the automatic heat storage principle of thick-layer sintering, the proportion of low-strength sinter in the upper layer can be reduced, sintering reaction time can be increased, sinter strength and yield can be improved, the carbon ratio in the sinter mixture can be reduced, fuel consumption can be lowered, and the nitrogen oxide content in the sintering flue gas can be reduced, thus helping to lower the emission concentration in the flue gas. Newly commissioned large-scale sintering machines in China generally have a side rail height of over 800mm, even reaching 1000mm, and operate according to the thick-layer slow-rotation process. However, many existing sintering machines, due to limitations imposed by their design production mode, generally have a lower side rail height, typically between 700 and 720mm, making it difficult to achieve thick-layer sintering, with the layer thickness remaining around 720mm for a long time. Low-layer sintering affects the improvement of sintering technical and economic indicators, manifested in high fuel consumption, low sinter strength, high return rate, and high nitrogen oxide concentration in the sintering flue gas.

[0003] Increasing the height of the existing sintering machine's side rails requires modifications to the machine itself. At the sintering machine's head feed point, the height of the mixed ore trough discharge port needs to be increased, as do the height of the material distribution rollers and multi-roller distributors, and the material passage height of the igniter. Modifications to the sintering machine's frame and tail feed box are also necessary. This project is time-consuming and expensive, and can only be carried out during major sintering machine overhauls. Since the sintering machine's overhaul cycle is 4-5 years, routine maintenance makes it difficult to complete the side rail modification project, resulting in long-term low-material-layer production. Without increasing the side rail height, increasing the material layer thickness beyond the side rail height causes the mixed material to easily overflow from the top of the side rail. This spilled material enters the return ore and returns to the sintering machine, increasing production costs. Therefore, it is necessary to develop a super-thick material layer technology without increasing the height of the slab, so as to increase the thickness of the material layer, prevent material spillage on the trolley, solve the problems of uneven air permeability of the thick material layer and poor ignition quality on both sides of the trolley, and realize the sintering of the thick material layer of the super-thick slab. Summary of the Invention

[0004] This invention addresses the problems existing in the prior art by providing a method for sintering thick material layers on a sintering machine trolley with an overhanging side plate. This technical solution, without increasing the height of the trolley side plate, achieves sintering production of thick material layers on the overhanging side plate by setting up a movable baffle, while solving problems such as overflow of sintered mixture from the trolley side plate, spillage polluting the site, and increased sinter return rate. Furthermore, by adding dual-sided pressing devices and adjustable-height scrapers, the edge effect on both sides of the trolley is reduced. By improving the structure of the igniter burner nozzle, the uniformity and ignition quality of the thick material layer sintering process on the overhanging side plate are improved, thereby increasing the quality of sintered ore and yield, and reducing fuel consumption and harmful gas emission concentrations.

[0005] The technical concept of this invention: The sintering machine material feeding system generally includes a material feeding shuttle trolley, a mixing ore trough, a material feeding mud roller, a multi-roller feeder, a flat material plate, and a pressure plate. First, the sintering mixture falls into the mixing ore trough via a reciprocating shuttle trolley, avoiding the formation of a significant pile in the middle of the trough, which would cause coarse particles to segregate to both sides. Then, relying on the rotation of the material feeding mud roller at the trough outlet, the mixture is thrown onto the multi-roller feeder, and finally, the mixture slides down the multi-roller feeder onto the sintering machine trolley moving below. After the trolley enters the igniter, it is ignited at a high temperature of 1150℃, igniting the added solid fuel. Under the suction of the exhaust fan, the combustion, cooling, and solidification process begins from top to bottom along the height of the material layer, producing sintered ore. Along the direction of the trolley's movement, the igniter has three rows of parallel burners, which are perpendicular to the material surface and serve as ignition points for sintering. There are three ignition burners on each side of the igniter, which are located above the material surface of the trolley and are parallel to the material surface.

[0006] Thick-layer production is a current trend in sintering production. However, due to the structural modifications involved in sintering machines, these modifications often only occur during major overhauls, resulting in the long-term inability to increase the height of the sintering machine's side rails. When implementing thick-layer material feeding with extra-thick side rails, the sintering material easily overflows from both sides of the trolley side rails, scattering onto the sides of the trolley and the hub. Current technical solutions for extra-thick side rail feeding typically involve fixing an inward-sloping baffle or guide plate inside the trolley side rails to prevent sintering material from overflowing. The disadvantages of these solutions are: the baffle angle and position are fixed and cannot be adjusted according to changes in material layer thickness, easily causing material accumulation and compression on the sides of the trolley, and the baffle is prone to material adhesion; in trapezoidal thick-layer sections, the lack of a baffle plate limits the height of the extra-thick side rail material layer, and excessively high layers can easily cause the trapezoidal slope to collapse; because the leveler is located inside the trolley, a narrow, elongated "convex" material layer is formed between the outside of the leveler and the side rails, making it difficult to level and often resulting in raw material.

[0007] To solve the above problems and achieve sintering of thick material layers in super-thick sintering plates, the technical solution of the present invention is as follows: a method for sintering thick material layers in super-thick sintering plates on a sintering machine trolley, the method comprising the following steps:

[0008] Step 1: Install a movable baffle with a backstop function. Install a spill-proof sealing rubber on the outside of the material collection section of the movable baffle;

[0009] Step 2: Form a thick material layer trapezoidal surface using the movable baffle plate;

[0010] Step 3: Install adjustable counterweight hopper-shaped pressing devices on both sides of the trapezoidal inclined surface. Install an adjustable height scraper on the upper part of the thick trapezoidal material layer to level the material surface;

[0011] Step 4: Extend the dwell time of the shuttle feeding trolley at the edge of the mixed material trough, and add blind furnace bars on both sides of the trolley;

[0012] Step 5: Extend the flame length on both sides of the igniter;

[0013] Step 6: Improve the igniter nozzle structure to adapt to trapezoidal material surface ignition.

[0014] As an improvement of the present invention, in step 1, a movable baffle plate with a length of 600-900mm and a height of 150-250mm is set on each side of the sintering machine trolley at the material feeding point of the feeding roller, with the movable baffle plate spaced 20-30mm from the upper edge of the trolley sideboard.

[0015] As an improvement of the present invention, the movable baffle is divided into two parts: a material gathering section and a material blocking section. The material gathering section is at a certain angle to the trolley sideboard and uses the power generated by the movement of the trolley to gather the mixed material towards the middle of the trolley. The other section is the material blocking section, which is parallel to the trolley sideboard and fixes the side of the trapezoidal thick material layer that is higher than the sideboard. The movable baffle maintains a certain distance from the upper edge of the trolley sideboard to prevent collision with the trolley. A high-temperature resistant rubber is installed on the outside of the material gathering section of the movable baffle. The rubber is fixed to the material gathering section of the baffle with bolts. The rubber is in close contact with the upper edge of the trolley sideboard to prevent the material accumulated at the multi-roller distributor from overflowing outside the trolley.

[0016] The movable baffle plate is connected to the worm gear mechanism via a connecting rod, and the worm gear mechanism is fixed to the platforms on both sides of the machine head. According to step 2, when sintering requires a material layer thicker than the baffle plate, the worm gear mechanism is used to move the movable baffle plate towards the center of the trolley, causing the material flow to converge towards the center of the trolley, forming a trapezoidal material surface for the material layer exceeding the height of the baffle plate. When the material layer thickness does not exceed the baffle plate, the movable baffle plate can be moved to the outside of the trolley baffle plate.

[0017] As an improvement of the present invention, in step 3, after the material is laid on the super-ballast plate, the thick material layer is trapezoidal, and the material layer on both sides of the trolley is thinner, with better air permeability than the middle. After the sintered mixture exits the movable baffle, side pressing devices are installed on both sides of the trapezoidal material surface. The side pressing devices are scoop-shaped, and the counterweight can be added or removed inside to adjust the pressing depth. By moving the movable baffle, the width of the two sides of the trapezoidal material layer can be matched with the width of the side pressing devices. An adjustable height scraper is set on the upper part of the trapezoidal thick material layer, which only scrapes the material surface and does not have a pressing effect. The worm gear mechanism is connected to the rotating shaft. Through the worm gear mechanism, the rotating shaft drives the scraper lifting mechanism to move up and down, which can adjust the height of the scraper and the material surface.

[0018] As an improvement to this invention, in step 4, after the material is laid on the overhead conveyor, the middle thick layer is trapezoidal, enhancing the edge effect of the trolley. Five to eight seamless blind furnace bars are installed on each side of the trolley's overhead conveyor to reduce air permeability on both sides of the trolley, resulting in better air permeability. To further reduce air permeability on both sides of the trolley and decrease the segregation of coarse particles from the mixture to the sides of the mixture trough, the dwell time is extended when the shuttle-type material-laying trolley's material drop point is at the edge of the mixture trough, remaining there for 4 to 6 seconds before turning back.

[0019] As an improvement to this invention, in step 5, after the material is laid on the super-ballast plate, the material layer thickness in the middle of the trolley is high, while the thickness on both sides is relatively thin. In the ignition process, according to a certain air-coal ratio, the opening of the ball valves of the burner gas and air pipelines on both sides of the trolley is increased to increase the gas and air flow and extend the flame length; the opening of the ball valves of the middle burner gas and air pipeline is appropriately reduced to decrease the flow and shorten the flame length.

[0020] As an improvement of the present invention, in step 6, to adapt to the super-balustrade material laying process, the rated ignition intensity of the 1-2 rows of burners on both sides of the trolley is 10-15% higher than that of the inner burners. At the same time, the ignition burner is tilted downwards by 15-30° to increase the contact area between the inclined side of the trapezoidal material surface and the leading edge of the flame of the ignition burner, improve the ignition quality at the inclined side, and solve the problem of ignition quality deviation on both sides of the trolley during super-balustrade material laying, which often results in raw material.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. This technical solution achieves sintering production with a thicker material layer than the standard material layer using existing equipment without increasing the height of the sintering machine trolley sideboard. The material layer thickness can be increased by up to 130mm. The strength of the sintered ore is improved, the proportion of low-strength sintered ore in the upper layer is reduced, and the sinter return rate decreases by 0.6% to 1%. Due to the enhanced heat storage effect of the thick material layer, solid fuel consumption is saved by 0.8 to 1.2 kg / t. At the same time, the concentration of nitrogen oxides in the sintering flue gas is reduced due to the reduction in solid fuel addition.

[0023] 2. This technical solution uses a movable baffle plate to solve the problem of mixed material overflowing and spilling from both sides of the trolley during the sintering production of thick material layers in the super-thick sintering plate, thereby reducing the amount of raw material returned to the sintering machine for reprocessing and the pollution from spilled material, and reducing the sintering processing cost.

[0024] 3. The movable baffle in this technical solution adopts a worm gear mechanism, which facilitates adjustment of the moving distance of the movable baffle to adapt to different material layer thicknesses and maintain uniform material flow. The worm gear's backstop function is used to fix the movable baffle in place.

[0025] 4. The material collection section of the movable baffle in this technical solution is covered with high-temperature resistant rubber, which is in close contact with the trolley sideboard. This not only prevents the material baffle from being bumped by the trolley's movement, but also enhances the sealing performance of the baffle and prevents material spillage at the drop point.

[0026] 5. The movable baffle plate makes the material surface on both sides of the trapezoidal thick material layer flat, and the baffle section plays a role in consolidating the trapezoidal inclined surface.

[0027] 6. In this technical solution, blind furnace bars are installed on both sides of the trolley, and an adjustable weighted scoop-shaped pressing device is used to extend the dwell time of the shuttle feeding trolley at the edge of the mixed material trough, reduce air permeability, and reduce the edge effect of the trolley.

[0028] 7. An adjustable-height scraper is installed on the upper part of the trapezoidal thick material layer. The height of the scraper relative to the material surface is flexibly adjusted using a worm gear mechanism. The scraper only serves to level the material layer, making the permeability of the thick material layer more uniform and thus improving the quality of the sinter.

[0029] 8. This technical solution shortens the flame length in the thick material layer area by extending the flame length on both sides of the igniter. It improves the igniter's nozzle structure, increasing the gas and air flow to the first two rows of nozzles on both sides of the trolley, thereby increasing the rated ignition intensity. Simultaneously, the downward tilt of the ignition burners on both sides of the igniter helps resolve ignition quality deviations at the trapezoidal slope of the trolley, which often results in raw material issues, thus improving the sintering yield. Attached Figure Description

[0030] Figure 1 , Figure 2 Schematic diagrams of the front and top views of the overall material feeding device for the sintering machine's super-ballast plate;

[0031] Figure 3 for Figure 1 Schematic diagram of a partial structure;

[0032] Figure 4 , Figure 5 A schematic diagram and a partial enlarged view of the installation of the movable baffle.

[0033] In the diagram: 1—Sintering machine trolley; 2—Trolley wheel; 3—Sintering machine track; 4—Trolley sideboard; 5—Mixed material; 6—Support platform; 7—Pressure plate; 8—Scraper; 9—Scraper lifting mechanism; 10—Nine-roller distributor; 11—Distribution mud roller; 12—Mixed material trough; 13—Modible baffle; 14—Gathering section; 15—Sealing rubber; 16—Blocking section; 17—Worm gear mechanism A; 18—Handwheel A; 19—Rotating shaft; 20—Handwheel B; 21—Worm gear mechanism B. Detailed Implementation

[0034] To enhance understanding of the present invention, the embodiments will be described in detail below with reference to the accompanying drawings.

[0035] Example 1: See Figures 1-5 A method for sintering a thick material layer on a sintering machine trolley with a super-thick material layer, the method comprising the following steps:

[0036] Step 1: Install movable baffles and sealing rubber in the material drop point area of ​​the multi-roller feeder of the sintering machine;

[0037] Step 2: Form a thick material layer trapezoidal surface using the movable baffle plate;

[0038] Step 3: Install adjustable counterweight hopper-shaped material pressing devices on both sides of the trapezoidal inclined surface. Install an adjustable height scraper on the upper part of the trapezoidal thick material layer;

[0039] Step 4: Extend the dwell time of the shuttle feeding trolley at the edge of the mixed material trough, and add blind furnace bars on both sides of the trolley;

[0040] Step 5: Extend the flame length on both sides of the igniter;

[0041] Step 6: Improve the structure of the igniter nozzle.

[0042] Specifically as follows:

[0043] (1) At 450m 2At the material drop point of the nine-roller feeder 10 of the sintering machine, on both sides of the sintering machine trolley 1, there is a movable baffle 13, 600-900mm long and 150-250mm high. The movable baffle 13 consists of two parts: a material-gathering section 14 inclined inwards towards the trolley 1 and a material-blocking section 16 parallel to the trolley 1. The movable baffle 13 is made of steel plate with a thickness of 8-12mm. The material-gathering section 14 forms an angle of 10-25° with the trolley sidewall. A layer of high-temperature resistant rubber 15 is covered on the outside of the material-gathering section 14 and fixed to the steel plate of the material-gathering section 14 with bolts. The lower edge of the rubber 15 extends 20-30mm beyond the upper edge of the trolley sidewall. A 30mm gap is maintained between the lower edge of the movable baffle and the upper edge of the trolley sidewall. When the movable baffle 13 moves inward, the rubber 15 presses against the trolley side plate 4, which not only prevents material spillage at the drop point but also avoids the lower edge of the movable baffle 13 rubbing against the trolley 1. The side of the material-blocking section 16 of the movable baffle 13 is connected to the worm gear mechanism A17 via a connecting rod, and the worm gear mechanism A17 is fixed on the two side platforms of the sintering machine head.

[0044] (2) When sintering requires a thicker material layer than the slab, the worm gear mechanism A17 is rotated by handwheel A18, and the connecting rod drives the movable baffle 13 to move laterally towards the center of the trolley 1. The material gathering section 14 of the movable baffle 13 causes the mixed material 5 to gather towards the center of the trolley 1, forming a trapezoidal material surface beyond the trolley slab 4. The moving distance of the movable baffle 13 can be flexibly adjusted according to the change in material layer thickness. The baffle section 16 plays the role of leveling and consolidating the inclined surface of the trapezoidal thick material layer. When the material layer thickness does not exceed the trolley slab 4, the movable baffle 13 can be moved to the outside of the trolley slab 4 by rotating handwheel A (18). The material layer can exceed the height of the trolley slab 4 by 80-130mm, reaching 800-850mm.

[0045] (3) After the movable baffle plate 13 exits the front of the sintered mixture 5, an adjustable counterweight hopper-shaped pressing plate 7 is installed on the material surface on both sides of the trapezoidal material surface and suspended on the support platform 6. The pressing width is 150-250mm and the pressing depth is 10-20mm; an adjustable height scraper 8 is installed on the upper part of the trapezoidal thick material layer area. The worm gear mechanism B21 is connected to the rotating shaft 19, and the rotating shaft 19 is connected to the scraper 8 through the lifting mechanism 9. The scraper only flattens the trapezoidal material surface and does not have a pressing effect, so as not to reduce the air permeability of the thick material layer area. By turning the handwheel B20, the rotating shaft 19 can drive the scraper lifting mechanism 9 to move up and down through the worm gear mechanism B21, which can adjust the height of the scraper 8 and the material surface.

[0046] (4) To reduce the edge effect of the trolley 1, 5 to 8 seamless blind furnace bars are installed on each side of the trolley sidewall 4. To reduce the segregation of coarse particles in the mixture to the sides of the mixture trough 12 and reduce the air permeability of the sides of the trolley 1, when the drop point of the shuttle feeding trolley moves to the edge of the mixture trough 12, the trolley stays for 4 to 6 seconds before turning back.

[0047] (5) In order to cope with the change that the ignition distance on both sides of the trolley 1 is higher than that of the middle material layer, the opening of the ball valve of the gas pipe and air pipe of the 2nd to 3rd row of burners on both sides of the trolley is increased, the opening of the ball valve of the gas pipe and air pipe of the middle burner is reduced, the flame length of the ignition burners on both sides is extended, and the flame length of the middle thick material layer area of ​​the mixture 5 is shortened.

[0048] (6) Improve the structure of the igniter nozzle and increase the rated gas flow rate of the 2-3 rows of nozzles on both sides of the trolley 1 by 10-15% compared with the middle nozzle, so as to improve the ignition intensity on both sides of the trolley 1. At the same time, the ignition burners on both sides of the igniter are tilted downward by 15-30° to increase the contact area between the inclined side of the trapezoidal material surface and the leading edge of the flame of the ignition burner, thus solving the problem of poor ignition intensity at the inclined side of the trapezoidal surface.

[0049] Implementation results:

[0050] 450m 2 After adopting the sintering machine trolley with a thicker material layer and a super-high grate plate, the problem of sintered mixture overflowing from both sides of the trolley during material feeding, causing significant spillage and waste, was solved while maintaining the grate plate height at 720mm. The quality of the thicker material layer with the super-high grate plate was improved, enabling sintering with this method using existing equipment. The automatic heat storage effect of the thicker material layer effectively reduces coke powder consumption. Based on actual production results, increasing the sintering layer thickness from 720mm to 800-850mm resulted in a decrease in coke powder consumption of 0.8-1.2 kg / t. Since nitrogen in the sintering flue gas mainly comes from coke powder, the reduced coke powder consumption lowers the sintering combustion temperature, leading to a decrease in nitrogen oxide concentration in the inlet flue gas and creating conditions for ultra-low nitrogen oxide emissions. The strength of the sintered ore was significantly improved after implementing the super-high grate plate material feeding method. This invention makes the sintering speed along the transverse and vertical direction of the sintering trolley more uniform, reduces the sintering edge effect, and improves the sintering ignition quality. In addition, the production of thick material layers reduces the proportion of low-strength sinter in the upper layer, which is beneficial to improving the strength of the sinter and increasing the sintering yield by 0.6-1%.

[0051] Since 2022, with rising ore prices, the structure of ore used in sintering has undergone significant changes. Sintering is increasingly using economical ores, significantly increasing the amount of coarse-grained limonite and reducing the concentrate ratio. This has led to a marked improvement in the original permeability of the sinter bed, necessitating an increase in bed thickness to adapt to the changing ore usage. This invention effectively solves the technical challenge of implementing super-thick bed sintering without raising the sintering machine's trolley rails. Sintering production practice shows that by adopting the super-thick bed material distribution technology and following the thick material slow-turn process production policy, even with the large-scale use of low-priced limonite, the positive effects of maintaining relatively stable sinter strength and yield, reducing environmental pollution, and lowering production costs can be achieved.

[0052] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention. Equivalent transformations or substitutions made based on the above technical solutions all fall within the scope of protection of the claims of the present invention.

Claims

1. A method for sintering a thick material layer on a sintering machine trolley with a super-thick material layer, characterized in that, The method includes the following steps: Step 1: Install a movable baffle with anti-backflow function in the material drop point area of ​​the multi-roller feeder of the sintering machine; install anti-spillage sealing rubber on the outside of the material gathering section of the movable baffle. Step 2: A thick material layer trapezoidal surface is formed by the movable baffle plate; Step 3: Install adjustable counterweight hopper-shaped pressing devices on both sides of the trapezoidal inclined surface, and install adjustable height scraper plates on the upper part of the trapezoidal thick material layer; Step 4: Extend the dwell time of the shuttle feeding trolley at the edge of the mixed material trough, and add blind furnace bars on both sides of the trolley; Step 5: Extend the flame length on both sides of the igniter; Step 6: Improve the igniter nozzle structure to adapt to trapezoidal material surface ignition; In step 1, on both sides of the sintering machine trolley, at the material feeding point of the multi-roller feeder, a movable baffle plate with a length of 600-900mm and a height of 150-250mm is set. The lower edge of the movable baffle plate is 20-30mm away from the upper edge of the trolley sideboard. The movable baffle plate consists of two parts: a material gathering section and a material blocking section. The material gathering section is at a certain angle to the trolley sideboard, using the power generated by the trolley's movement to gather the mixture towards the center of the trolley. The other section is a material blocking section parallel to the trolley sideboard, connected to the material gathering section. The parallel material blocking section can flatten the sides of the trapezoidal thick material layer, solidify the slope, and prevent collapse. The movable baffle is connected to the worm gear mechanism via a connecting rod. The worm gear mechanism is fixed on the two platforms on both sides of the machine head. When sintering requires a material layer thicker than the guardrail, the worm gear mechanism is used to move the movable baffle towards the center of the trolley, causing the material flow to converge towards the center of the trolley. The material layer exceeding the height of the guardrail forms a trapezoidal material surface. The higher the material layer thickness, the longer the movable baffle moves towards the center of the trolley, reducing material accumulation on the side of the trolley. When the material layer thickness does not exceed the guardrail, the movable baffle can be moved to the outside of the trolley guardrail for cleaning and maintenance. The movable baffle is spaced apart from the upper edge of the trolley sideboard to prevent collision with the trolley. A high-temperature resistant rubber is installed on the outside of the material gathering section of the movable baffle. The rubber is fixed to the material gathering section of the baffle with bolts. The rubber is in close contact with the upper edge of the trolley sideboard to prevent the material accumulated at the multi-roller distributor from overflowing outside the trolley.

2. The sintering method for thick material layer of the sintering machine trolley overpass plate according to claim 1, characterized in that, In step 3, after the material is laid on the super-ballast plate, the thick material layer is trapezoidal. The material layer on both sides of the trolley is thinner and has better air permeability than the middle. After the sintered material exits the movable baffle, side pressing devices are installed on both sides of the trapezoidal slope. The side pressing devices are scoop-shaped and can be adjusted by adding or removing counterweights to adjust the pressing depth. The width of the trapezoidal material layer on both sides is matched with the width of the side pressing devices by moving the movable baffle. An adjustable height scraper is set on the upper part of the trapezoidal thick material layer. The worm gear mechanism is connected to the rotating shaft, and the scraper lifting mechanism moves up and down through the worm gear mechanism and the rotating shaft to adjust the height of the scraper and the material surface.

3. The sintering method for thick material layer distribution on the sintering machine trolley overpass plate according to claim 2, characterized in that, In step 4, after the material is placed on the super-ballast plate, the middle is a trapezoidal thick material layer, and the air permeability of the trolley edge is enhanced. Five to eight seamless blind furnace bars are installed on each side of the trolley side plate to reduce the air permeability on both sides of the trolley. When the material drop point of the shuttle material placing trolley moves to the edge of the mixed material trough, the dwell time is extended, and it stays for 4 to 6 seconds before turning back.

4. The sintering method for thick material layer distribution on the sintering machine trolley overpass plate according to claim 3, characterized in that, In step 5, in the ignition process, according to a certain air-to-coal ratio, the opening of the ball valves of the burner gas and air pipelines on both sides of the trolley is increased to increase the gas and air flow and extend the flame length. Reduce the opening of the ball valves in the gas and air pipelines of the intermediate burner to decrease the flow rate and shorten the flame length.

5. The sintering method for thick material layer distribution on the sintering machine trolley overpass plate according to claim 4, characterized in that, In step 6, the rated ignition intensity of the first and second rows of burners on both sides of the trolley is 10-15% higher than that of the inner burners, and at the same time, the ignition burner changes from being parallel to being tilted downwards by 15-30°.

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