Self-cleaning sintering furnace

Abstract

A self-cleaning sintering kiln comprises a furnace body and a plurality of discharge units, the transmission direction of materials in the hearth of the furnace body is the length direction of the furnace body, the bottom wall of the hearth is divided into a plurality of discharge areas along the length direction of the furnace body, each discharge area comprises a material collecting bottom surface, a discharge port and two discharge inclined surfaces, the two discharge inclined surfaces are located on both sides of the material collecting bottom surface, the discharge port is located in the middle of the material collecting bottom surface, each discharge area corresponds to a discharge unit, the discharge unit comprises a discharge hopper and two material pushing mechanisms, the discharge hopper is connected with the corresponding discharge port, and the two material pushing mechanisms are arranged on both sides of the discharge port in the width direction of the furnace body and are respectively used for pushing the materials on the material collecting bottom surface to the discharge port. The present application can discharge the materials outside the furnace without disassembling the furnace body structure, avoids affecting the sealing effect caused by disassembling the furnace body structure back and forth, realizes the long-time normal operation of the equipment, improves the continuous operation time, reliability and automation of the equipment, improves the production capacity and reduces the energy consumption.

Description

Technical Field

[0001] This invention relates to the field of sintering equipment, and more particularly to a self-cleaning sintering kiln. Background Technology

[0002] Sealed roller furnaces are used for sintering materials under non-air atmosphere conditions. The material is placed in a sagger and moves forward via rotating rollers. Several heating elements are arranged sequentially from front to back above the material's movement area and below the rollers. The furnace cavity is heated to the appropriate temperature according to the customer's process requirements. The material moves from the furnace head to the furnace tail at a set process speed to complete the sintering cycle, enabling mass production. Due to their inherent characteristics, different products exhibit different sintering states during the sintering process. Some products may exhibit boiling phenomena due to sintering reactions, causing material to spray out of the sagger and fall to the bottom of the furnace cavity. If not handled promptly, this material accumulates and can clog the air inlet at the bottom of the furnace, even obscuring the heating elements in the lower layer of the furnace cavity. Furthermore, prolonged high-temperature baking can cause the material to clump together at the bottom of the furnace, making it difficult to clean.

[0003] Currently, there are two methods used in the industry to deal with this phenomenon. One method is for sintered products with minor refractory spraying. During a major kiln overhaul, the refractory material inside the kiln is disassembled, and personnel enter the furnace cavity to clean the material and lumps. However, this method of disassembling the kiln refractory material for maintenance has several drawbacks. First, during cleaning, the feeding needs to be stopped and the temperature lowered to a temperature that is safe for personnel to operate. At the same time, the furnace structure that affects cleaning needs to be removed. After cleaning, the removed structural components need to be reinstalled, and the temperature needs to be raised back to the process temperature. Normal production can resume after the equipment is debugged and is in good working order. This process can take anywhere from a few days to several tens of days, which greatly reduces the normal working time of the equipment, affects normal production, lowers production capacity, and wastes energy during the heating and cooling process. Second, for sealed kilns, frequent disassembly will cause aging and damage to the sealing components, affecting the sealing performance, thereby reducing the performance of the kiln and the product.

[0004] Another method involves opening a maintenance port at a specific location on the furnace body. During normal operation, the port is closed, and it is opened periodically for cleaning the material at the bottom of the furnace. However, this method of periodically cleaning via a maintenance port requires increasing the process gas pressure during maintenance to maintain a high positive pressure inside the furnace. This prevents outside air from entering the furnace cavity during maintenance, which could affect the sintering environment and cause substandard product performance. This results in: firstly, increased process gas and energy consumption, leading to higher production costs; secondly, safety risks for employees during cleaning operations; and thirdly, poor control of process parameters, which can easily lead to substandard sintered product performance. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a self-cleaning sintering kiln that allows materials to be discharged outside the furnace without disassembling the furnace body structure, avoids the impact of repeated disassembly of the furnace body structure on the sealing effect, realizes long-term normal operation of the equipment, and improves the continuous operation time of the equipment.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A self-cleaning sintering kiln includes a kiln body and multiple discharge units. The length direction of the kiln body is defined by the material transport direction within the kiln chamber. The bottom wall of the kiln chamber is divided into multiple discharge zones along the length direction of the kiln body. Each discharge zone includes a material collection bottom surface, a discharge port, and two discharge ramps. The two discharge ramps are located on both sides of the material collection bottom surface, and the discharge port is located in the middle of the material collection bottom surface. Each discharge zone corresponds to one discharge unit. Each discharge unit includes a discharge funnel and two pushing mechanisms. The discharge funnel is connected to the corresponding discharge port, and the two pushing mechanisms are located on both sides of the discharge port in the width direction of the kiln body and are used to push the material on the material collection bottom surface toward the discharge port.

[0008] As a further improvement to the above technical solution, an air intake channel is provided between two adjacent discharge ramps. The air intake channel is embedded in the bottom wall of the furnace. The air intake channel has two branch outlets, which are located at the top of the slopes of the two adjacent discharge ramps and face the discharge ramps on both sides of the top of the slopes respectively.

[0009] As a further improvement to the above technical solution, an upwardly protruding lower partition is provided between two adjacent discharge zones. The lower partition is located at the top of the slope of the two adjacent discharge slopes, and the branch outlet is located on the lower partition. The top of the lower partition is a pointed tip.

[0010] As a further improvement to the above technical solution, the discharge unit also includes a discharge pipe, the discharge funnel is connected to the discharge pipe and the connection point between the two is on the outer wall of the discharge pipe, and the discharge pipe is provided with a pusher to push the material out of the discharge pipe.

[0011] As a further improvement to the above technical solution, the discharge hopper is equipped with a vibrator and a crushing mechanism.

[0012] As a further improvement to the above technical solution, the discharge hopper is also equipped with an upper material level gauge and an lower material level gauge, the vibrator and the crushing mechanism are both located between the upper material level gauge and the lower material level gauge, and the outlet of the discharge hopper is equipped with an automatic valve.

[0013] As a further improvement to the above technical solution, the furnace chamber is equipped with a roller shaft for conveying materials. The pushing mechanism includes a pushing rod, a transmission rod, a clutch, helical gear one, helical gear two, helical gear three, helical gear four, and helical gear five. The pushing rod passes through the side wall of the furnace chamber, with one end located inside the furnace chamber and the other end located outside the furnace chamber. Helical gear one, the clutch, and helical gear two are all fixed to the part of the roller shaft that extends outside the furnace chamber. The clutch is located between helical gear one and helical gear two. Helical gear one and helical gear two are arranged opposite each other. Helical gear three and helical gear four are respectively located at both ends of the transmission rod. Helical gear five is sleeved on the pushing rod. Helical gear three can mesh with helical gear one or helical gear two to realize the forward and reverse rotation of the transmission rod. Helical gear four meshes with helical gear five. Helical gear five is provided with internal threads. The pushing rod is provided with external threads that cooperate with the internal threads.

[0014] As a further improvement to the above technical solution, the push rod is provided with a push-out proximity switch and a retraction proximity switch, which are respectively located on both sides of the helical gear five.

[0015] As a further improvement to the above technical solution, a torque meter for monitoring transmission torque is provided on the transmission rod.

[0016] As a further improvement to the above technical solution, a heating box is provided on the outer wall of the furnace body, the end of the roller shaft is located inside the heating box, and the transmission rod, clutch, helical gear one, helical gear two, helical gear three, helical gear four and helical gear five are all located inside the heating box.

[0017] Compared with the prior art, the advantages of the present invention are as follows:

[0018] The self-cleaning sintering kiln of this invention, through the setting of a discharge ramp, a material collecting bottom surface, a discharge port, and a pushing mechanism, utilizes gravity to collect materials at the bottom of the kiln body, solving the problem of materials scattering throughout the kiln cavity. This allows materials to be discharged outside the kiln without disassembling the kiln structure, avoiding repeated disassembly of the kiln structure which could affect the sealing effect. This enables long-term normal operation of the equipment, improving continuous operating time, reliability, and automation, thereby increasing production capacity and reducing energy consumption. By controlling the presence of material in the discharge funnel to always isolate the atmosphere inside the kiln from the outside atmosphere, it protects the kiln atmosphere, thus solving the problem of material accumulation at the bottom of the kiln cavity during sintering due to material boiling, requiring regular manual cleaning, and the resulting energy waste and reduced production capacity. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the self-cleaning sintering kiln in this embodiment.

[0020] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0021] Figure 3 yes Figure 1 AA view in the middle.

[0022] Figure 4 yes Figure 3 A magnified view of a portion of the image.

[0023] Figure 5 This is a schematic diagram of the material pushing mechanism in this embodiment.

[0024] Figure 6 This is a schematic diagram of the control principle of the self-cleaning sintering kiln in this embodiment.

[0025] The labels in the diagram represent:

[0026] 100. Furnace body; 110. Furnace chamber; 120. Discharge area; 121. Material collection bottom surface; 122. Discharge port; 123. Discharge slope; 130. Air inlet channel; 131. Branch outlet; 140. Lower partition; 141. Upper partition; 150. Roller; 160. Heating box; 170. Sagger; 181. Upper heating element; 182. Lower heating element; 190. Flue gas outlet; 200. Discharge funnel; 210. Vibrator; 220. Crushing mechanism; 221. Crusher 222 Crushing cylinder body; 230 Crushing rod; 240 Loading level gauge; 250 Unloading level gauge; 300 Automatic valve; 310 Pushing mechanism; 311 Pushing rod; 312 Pushing out proximity switch; 312 Retracting proximity switch; 320 Transmission rod; 321 Torque meter; 330 Clutch; 340 Helical gear one; 350 Helical gear two; 360 Helical gear three; 370 Helical gear four; 380 Helical gear five; 400 Discharge pipe; 410 Pusher. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 4 As shown, the self-cleaning sintering kiln of this embodiment includes a kiln body 100 and multiple discharge units. The direction of material transport within the furnace chamber 110 of the kiln body 100 is defined as the length direction of the kiln body 100. Figure 1Arrow k indicates the material conveying direction. Material is loaded through the sagger 170 and conveyed forward by the conveying mechanism. The bottom wall of the furnace 110 is divided into multiple discharge zones 120 along the length of the furnace body 100. Each discharge zone 120 includes a collecting bottom surface 121, a discharge port 122, and two discharge ramps 123. The two discharge ramps 123 are located on both sides of the collecting bottom surface 121, and the discharge port 122 is located in the middle of the collecting bottom surface 121. In other words, the bottom wall of the furnace 110 has been changed from a flat bottom structure to an inverted trapezoidal structure. Each discharge zone 120 corresponds to a discharge unit, which includes a discharge funnel 200 and two pushing mechanisms 300. The discharge funnel 200 is connected to the corresponding discharge port 122, and the two pushing mechanisms 300 are located on both sides of the discharge port 122 in the width direction of the furnace body 100 and are used to push the material on the collecting bottom surface 121 towards the discharge port 122. Figure 1 Two discharge areas and two discharge units are shown.

[0029] like Figure 2 As shown, the bottom surface 121 of the material collection is along the width of the furnace body 100. Since the furnace body 100 is usually a cuboid structure, in order to reduce the sealing problem caused by an excessively large discharge port 122, the discharge port 122 is located in the middle of the bottom surface 121 of the material collection. Then, pushing mechanisms 300 are set at the bottom surfaces 121 of the material collection on both sides. In this way, when the material overflows from the sagger 170 due to heating and falls into the various discharge areas 120, the material falling on the discharge slope 123 slides down the slope under the action of gravity and gathers on the bottom surface 121 of the material collection for easy cleaning. Some of it directly enters the discharge port 122 and falls into the discharge funnel 200. The material falling on the bottom surface 121 of the material collection is pushed into the discharge port 122 by activating the pushing mechanisms 300 on both sides. After the material in the discharge hopper 200 is filled to a certain amount, it is periodically discharged. During the discharge process, it is necessary to ensure that a certain amount of material is always left in the discharge hopper 200 to prevent external air from entering the furnace 110.

[0030] This self-cleaning sintering kiln, through the design of the discharge ramp 123, the collecting bottom surface 121, the discharge port 122, and the pushing mechanism 300, utilizes gravity to collect materials at the bottom of the kiln body, solving the problem of materials scattering throughout the kiln cavity. It allows materials to be discharged outside the kiln without disassembling the kiln structure, avoiding repeated disassembly of the kiln structure which could affect the sealing effect. This enables the equipment to operate normally for extended periods, improving continuous operating time, reliability, and automation, thereby increasing production capacity and reducing energy consumption. By ensuring that there is always material in the discharge hopper, the atmosphere inside the kiln is isolated from the outside atmosphere, protecting the kiln atmosphere. This solves the problem of material accumulation at the bottom of the kiln cavity during sintering due to material boiling, requiring regular manual cleaning, and the resulting energy waste and reduced production capacity.

[0031] In this embodiment, the sintering kiln is a roller conveyor furnace, and the conveying mechanism consists of multiple rollers 150. An upper heating element 181 and a lower heating element 182 are provided inside the furnace chamber 110. The upper heating element 181 is above the rollers 150, and the lower heating element 182 is below the rollers 150. A heating box 160 is provided on the outer wall of the furnace body 100. The portions of the upper heating element 181 and the lower heating element 182 extending outside the furnace chamber 110 are located inside the heating box 160 and sealed by the heating box. The ends of the rollers 150 are also located inside the heating box 160.

[0032] In this embodiment, an air inlet channel 130 is provided between two adjacent discharge ramps 123. The air inlet channel 130 is embedded in the bottom wall of the furnace 110. The air inlet channel 130 has two branch outlets 131, which are located at the top of the slopes of the two adjacent discharge ramps 123 and face the discharge ramps 123 on both sides of the top. With this air inlet structure, the branch outlets 131 slope downwards along the discharge ramps 123, allowing process gas to enter the interior of the furnace 110. The airflow creates a purging effect on the discharge ramps 123, causing the material on the discharge ramps 123 to slide onto the bottom collecting surface 121, further improving the cleaning effect. A flue gas outlet 190 is provided at the top of the corresponding furnace.

[0033] Specifically, a protruding lower partition 140 is provided between two adjacent discharge zones 120. The lower partition 140 is located at the top of the slopes of the two adjacent discharge ramps 123, and the branch outlet 131 is located on the lower partition 140. Correspondingly, an upper partition 141 is provided at the top of the furnace 110. The upper and lower partitions form multiple temperature zones within the furnace 110 for individual temperature control. The top of the lower partition 140 is pointed, resembling a conical structure, and extends close to the roller 150. The conical design of the top of the lower partition 140 prevents material from accumulating on it. Through the arrangement of the lower partition 140 and the discharge ramps 123, the bottom surface of the furnace 110 has virtually no flat surface for material accumulation, thus ensuring thorough cleaning and improving cleaning efficiency.

[0034] In this embodiment, the discharge unit also includes a discharge pipe 400. The discharge funnel 200 is connected to the discharge pipe 400, and the connection point between the two is on the outer wall of the discharge pipe 400. A pusher 410 is provided inside the discharge pipe 400 to push the material out of the discharge pipe 400. The discharge pipe 400 is horizontally set and slightly inclined downward at a certain angle. An automatic valve 250 is provided at the outlet of the discharge funnel 200. The material enters the discharge pipe 400 by opening and closing the automatic valve 250 and is discharged out of the furnace under the action of gravity. The pusher 410 is located at the rear end of the discharge pipe 400 and is driven by electric, pneumatic or other power sources. It can push back and forth inside the discharge pipe 400 to help the material be discharged smoothly from the discharge pipe 400.

[0035] In this embodiment, the discharge hopper 200 is equipped with a vibrator 210 and a crushing mechanism 220. The vibrator 210 is located at the lower part of the discharge hopper 200 and is used to vibrate the discharge hopper 200 to loosen the material in the hopper and allow the material to fall into the discharge pipe 400, thus preventing the material in the hopper from clogging. The crushing mechanism 220 is located on the side wall of the discharge hopper 200 and consists of a crushing cylinder 221 and a crushing rod 222. The crushing cylinder 221 is connected to the discharge hopper 200, and the hopper wall enclosed by the two has a connecting hole. One end of the crushing rod 222 is located inside the crushing cylinder 221 and extends to the connecting hole, while the other end is located outside the crushing cylinder 221 and connected to the power source. The crushing rod 222 can move along the axis of the crushing cylinder 221. When the material in the discharge hopper 200 clumps together and the vibrator 210 cannot vibrate the material out, the crushing rod 222 can reciprocate through the connecting hole in the discharge hopper 200 under the drive of the power source to crush the clumped material and clear the discharge path.

[0036] Specifically, the discharge hopper 200 is also equipped with an upper level gauge 230 and an lower level gauge 240. The vibrator 210 and the crushing mechanism 220 are both located between the upper level gauge 230 and the lower level gauge 240. The upper level gauge 230 and the lower level gauge 240 are used to detect the upper and lower limits of material accumulation in the discharge hopper 200. When the upper limit is reached, it indicates that too much material has accumulated in the discharge hopper 200 during the discharge cycle, and the cleaning cycle needs to be shortened. When the lower limit is reached, the automatic valve 250 is closed to ensure that there is an appropriate amount of material in the discharge hopper 200, preventing the discharge hopper 200 from emptying out and causing external gas to enter the furnace 110 and affect the process environment.

[0037] like Figure 5As shown, in this embodiment, the pushing mechanism 300 includes a pushing rod 310, a transmission rod 320, a clutch 330, a first helical gear 340, a second helical gear 350, a third helical gear 360, a fourth helical gear 370, and a fifth helical gear 380. The pushing rod 310 passes through the side wall of the furnace 110, with one end located inside the furnace 110 and the other end located outside the furnace 110. The first helical gear 340, the clutch 330, and the second helical gear 350 are all fixed to the portion of the roller 150 extending outside the furnace 110. The clutch 330 is located between the first helical gear 340 and the second helical gear 350. Between 0 and 0, helical gear 1 340 and helical gear 2 350 are arranged opposite each other, helical gear 360 and helical gear 4 370 are respectively located at both ends of the transmission rod 320, and helical gear 5 380 is sleeved on the push rod 310. Helical gear 360 can mesh with helical gear 1 340 or helical gear 2 350 to realize the forward and reverse rotation of the transmission rod 320. Helical gear 4 370 meshes with helical gear 5 380. Helical gear 5 380 has an internal thread, and the push rod 310 has an external thread that mates with the internal thread. The rotation of helical gear 5 380 can drive the push rod 310 forward and backward. Among them, the end of the roller 150 is located inside the heating box 160. The transmission rod 320, clutch 330, helical gear 1 340, helical gear 2 350, helical gear 360, helical gear 4 370 and helical gear 5 380 are all located inside the heating box 160. The end of the push rod 310 is provided with a push plate for pushing materials.

[0038] During operation, clutch 330 engages with helical gear 2 350. As roller 150 rotates, power is transmitted to push rod 310 via helical gear 360, transmission rod 320, helical gear 4 370, and helical gear 5 380. Simultaneously, the push rods 310 on both sides move towards the center of the furnace 110, pushing the material deposited at the bottom of the furnace into the discharge port 122 located at the bottom center. After the pushing action is completed, clutch 330 disengages from helical gear 2 350 and engages helical gear 1 340 in the opposite direction. As roller 150 rotates, power is transmitted to push rod 310 via helical gear 360, transmission rod 320, helical gear 4 370, and helical gear 5 380, causing the push rods 310 on both sides to move outwards from the furnace 110 and return to their original positions. A torque meter 321 is installed on transmission rod 320 to monitor the transmission torque.

[0039] In this embodiment, the push rod 310 is equipped with a push-out proximity switch 311 and a retraction proximity switch 312, which are respectively located on both sides of the helical gear 380. The push-out proximity switch 311 and the retraction proximity switch 312 are fixed on the push rod 310, and the spacing between them on the push rod 310 is used to control the depth of the push rod 310 entering the furnace during operation.

[0040] This embodiment also includes an automatic control system, which consists of sensors, a controller, and actuators. The sensors include an upper level gauge 230 and an lower level gauge 240 located on the discharge hopper 200, a torque meter 321 located on the transmission rod 320, and a push-out proximity switch 311 and a retraction proximity switch 312 located on the pusher rod 310. The actuators include a vibrator 210, a crushing mechanism 220, and an automatic valve 250 located on the discharge hopper 200, a pusher 410 located on the discharge pipe 400, a clutch 330 located on the roller 150, and an alarm (not shown in the figure). The controller cleans the material inside the furnace according to a set cycle via the pusher mechanism 300; controls the discharge hopper 200 and the discharge pipe 400 to discharge the material outside the furnace according to set logic; and implements alarms for abnormal cleaning system conditions according to set rules. Figure 6 As shown, the cleaning cycle time is set to T in the controller according to actual usage (the cycle T is set based on the material being cleaned once in the furnace, with the material level in the discharge hopper 200 between the upper material level gauge 230 and the lower material level gauge 240). At the start of cycle T, the controller controls the clutch 330 to drive the helical gear 2 350 to drive the pushing mechanism 300, so that the pushing rod 310 pushes the material accumulated at the bottom of the furnace 110 into the discharge hopper 200 at the bottom of the furnace. When the push-out proximity switch 311 on the pushing rod 310 is triggered, it indicates that the pushing is over. After that, the clutch 330 disengages from the helical gear 2 350 and engages the helical gear 1 340 in the opposite direction, driving the pushing rod 310 to retract outward. When the retraction proximity switch 312 on the pushing rod 310 is triggered, it indicates that the retraction is over, the clutch 330 disengages from the helical gear 1 340, and the pushing rod 310 returns to its original position. The system is in a state of readiness. Next, the controller controls the automatic valve 250 located on the discharge hopper 200 at the bottom of the furnace to open. Then, the vibrator 210 starts working to help the material in the discharge hopper 200 fall into the discharge pipe 400. When the material level in the discharge hopper 200 is lower than the material level gauge 240, the controller controls the automatic valve 250 to close, and then controls the pusher 410 to push the material out of the furnace. If, after a set time △t1 (△t1 < T), the material level gauge 240 detects that there is always material in the discharge hopper 200, then the crushing mechanism 220 is controlled to crush the material in the hopper to ensure that the material can be discharged smoothly. When the material in the hopper exceeds the upper material level gauge 230 within cycle T, the controller activates the alarm to prompt the operator to adjust the cleaning cycle; when the crushing mechanism 220 is started and passes through △t2, if the lower material level gauge 240 still shows material, the controller activates the alarm to prompt that the discharge hopper 200 is blocked; when the torque detected by the torque meter 321 on the transmission rod 320 exceeds the set upper limit, the clutch 330 automatically disengages to prevent the roller shaft 150 from breaking due to excessive force, and at the same time the alarm sounds to indicate abnormal thrust.

[0041] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the present invention, should fall within the protection scope of the present invention.

Claims

1. A self-cleaning sintering kiln, characterized in that: The furnace includes a furnace body (100) and multiple discharge units. The direction of material transport within the furnace chamber (110) of the furnace body (100) is taken as the length direction of the furnace body (100). The bottom wall of the furnace chamber (110) is divided into multiple discharge zones (120) along the length direction of the furnace body (100). Each discharge zone (120) includes a material collection bottom surface (121), a discharge port (122), and two discharge ramps (123). The two discharge ramps (123) are located on both sides of the material collection bottom surface (121), and the discharge port (122) is located in the middle of the material collection bottom surface (121). The material is loaded through a sagger (170) and conveyed forward by a transport mechanism. Due to heating, the material overflows from the sagger (170) and falls into each of the discharge zones (120). The material falling on the discharge ramps (123) slides down the ramps under gravity and collects at the bottom. On the bottom surface (121) of the collection; each discharge area (120) corresponds to a discharge unit, the discharge unit includes a discharge funnel (200) and two pushing mechanisms (300), the discharge funnel (200) is connected to the corresponding discharge port (122), the two pushing mechanisms (300) are located on both sides of the discharge port (122) in the width direction of the furnace body (100) and are respectively used to push the material on the bottom surface (121) of the collection to the discharge port (122), an air intake channel (130) is provided between two adjacent discharge slopes (123), the air intake channel (130) is buried in the bottom wall of the furnace (110), the air intake channel (130) is provided with two branch outlets (131), the two branch outlets (131) are located at the top of the slope of two adjacent discharge slopes (123) and are respectively facing the discharge slopes (123) on both sides of the top of the slope.

2. The self-cleaning sintering kiln according to claim 1, characterized in that: A protruding lower partition (140) is provided between two adjacent discharge zones (120). The lower partition (140) is located at the top of the slope of two adjacent discharge ramps (123). The branch outlet (131) is located on the lower partition (140). The top of the lower partition (140) is a pointed tip.

3. The self-cleaning sintering kiln according to any one of claims 1 to 2, characterized in that: The discharge unit also includes a discharge pipe (400), the discharge funnel (200) is connected to the discharge pipe (400) and the connection point between the two is on the outer wall of the discharge pipe (400), and the discharge pipe (400) is provided with a pusher (410) to push out the material in the discharge pipe (400).

4. The self-cleaning sintering kiln according to claim 3, characterized in that: The discharge hopper (200) is equipped with a vibrator (210) and a crushing mechanism (220).

5. The self-cleaning sintering kiln according to claim 4, characterized in that: The discharge hopper (200) is also equipped with an upper material level gauge (230) and a lower material level gauge (240). The vibrator (210) and the crushing mechanism (220) are both located between the upper material level gauge (230) and the lower material level gauge (240). The outlet of the discharge hopper (200) is equipped with an automatic valve (250).

6. The self-cleaning sintering kiln according to any one of claims 1 to 2, characterized in that: The furnace chamber (110) is equipped with a roller (150) for conveying materials. The pushing mechanism (300) includes a pushing rod (310), a transmission rod (320), a clutch (330), a helical gear one (340), a helical gear two (350), a helical gear three (360), a helical gear four (370), and a helical gear five (380). The pushing rod (310) passes through the side wall of the furnace chamber (110), with one end located inside the furnace chamber (110) and the other end located outside the furnace chamber (110). The helical gear one (340), the clutch (330), and the helical gear two (350) are all fixed to the part of the roller (150) that extends out of the furnace chamber (110). The clutch ( 330) is located between helical gear one (340) and helical gear two (350). Helical gear one (340) and helical gear two (350) are arranged opposite each other. Helical gear three (360) and helical gear four (370) are respectively located at both ends of the transmission rod (320). Helical gear five (380) is sleeved on the push rod (310). Helical gear three (360) can mesh with helical gear one (340) or helical gear two (350) to realize the forward and reverse rotation of the transmission rod (320). Helical gear four (370) meshes with helical gear five (380). Helical gear five (380) is provided with internal thread. The push rod (310) is provided with external thread that mates with the internal thread.

7. The self-cleaning sintering kiln according to claim 6, characterized in that: The push rod (310) is equipped with a push-out proximity switch (311) and a retraction proximity switch (312), which are respectively located on both sides of the helical gear five (380).

8. The self-cleaning sintering kiln according to claim 6, characterized in that: The transmission rod (320) is equipped with a torque meter (321) for monitoring the transmission torque.

9. The self-cleaning sintering kiln according to claim 6, characterized in that: A heating box (160) is provided on the outer wall of the furnace body (100). The end of the roller (150) is located inside the heating box (160). The transmission rod (320), clutch (330), helical gear one (340), helical gear two (350), helical gear three (360), helical gear four (370) and helical gear five (380) are all located inside the heating box (160).

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