Coal gangue belt type decarburization sintering machine with low ventilation resistance

Abstract

The invention relates to the technical field of coal gangue treatment, and particularly discloses a coal gangue belt type decarburization sintering machine with low ventilation resistance, which comprises a plurality of grid section trolleys, a spreading unit is arranged above the grid section trolleys, and a plurality of draught hoods are arranged below the upper row of grid section trolleys side by side; an ignition device is arranged above the portion, close to one side of the material spreading unit, of the grate bar trolley, a hole pricking and material loosening mechanism is arranged between the ignition device and the material spreading unit and comprises a portal frame arranged in the moving direction of the grate bar trolley, a strip-shaped box is arranged in the portal frame, and the lower surface of the strip-shaped box communicates with a row of end pipes. The lower ends of the end pipes communicate with hole pricking pipes, and movable drawing rods with the top ends stretching out of the strip-shaped box in a sealed mode are inserted into the hole pricking pipes correspondingly. According to the coal gangue belt type decarburization sintering machine, the fan power of the calcination section can be effectively reduced, the coal gangue calcination decarburization time is shortened, the sintering efficiency is improved, and meanwhile the performance of a finally prepared product can be effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of coal gangue treatment, and specifically discloses a coal gangue belt-type decarbonization sintering machine with low ventilation resistance. Background Art

[0002] The decarbonization sintering of coal gangue is mainly divided into two methods: shaft kiln sintering and belt (or walking beam) sintering. The traditional shaft kiln sintering has problems such as small processing scale, low decarbonization efficiency, and high energy consumption. Currently, large enterprises in the industry all use belt sintering machines to carry out decarbonization sintering treatment on coal gangue.

[0003] The existing belt sintering machine mainly consists of a driving unit, a grate trolley, a feeding device, an ignition device, a discharging device, and an air extraction system. During operation, the grate trolley is driven by the driving unit to move in a cycle. First, the coal gangue material is spread on the grate trolley by the feeding device, and then the upper layer of coal gangue is ignited by the ignition device. After ignition, during its moving and conveying process, the air extraction system continuously sucks the area below the grate trolley, so that the air flows from top to bottom, realizing the calcination of the material layer from top to bottom. When the grate trolley after sintering moves to the discharging device, it is crushed and discharged by a single-hammer crusher. Among them, the sintering speed and decarbonization effect of coal gangue are not only affected by the carbon content and humidity of the coal gangue itself, but more importantly, by the ventilation resistance of the material layer in the grate trolley. When the particles of the coal gangue material in the material layer are small, the ventilation resistance increases, and a higher operating power is required for the fan in the air extraction system, resulting in an increase in the energy consumption of the equipment operation; while when the particles of the coal gangue material in the material layer are large, although the ventilation resistance of the material layer is small, due to the large particle size of the coal gangue, it affects the sintering uniformity of the coal gangue and cannot effectively guarantee the performance of the final product.

[0004] The invention patent with the application number 202410912594.7 discloses a belt-type sintering decarbonization system for coal gangue, which includes a belt-type sintering decarbonization unit, a feeding unit, and a discharging and crushing unit. The belt-type sintering decarbonization unit includes grate bar trolleys that move cyclically along the track box. Below each of the upper row of grate bar trolleys, there is an air extraction hood, and the lower end of the air extraction hood is connected to an air extraction fan through a pipeline. In addition, in the grate bar trolleys below the feeding unit, there is an air distribution pipe parallel to the running direction of the grate bar trolleys, and air distribution holes are opened on the lower surface of the air distribution pipe. The belt-type sintering decarbonization system for coal gangue disclosed in this invention patent can loosen and preheat and dry the coal gangue material layer laid on the grate bar trolleys through the design of the air distribution pipe, and has a certain effect on reducing the ventilation resistance of the material layer. However, the reduction and adjustment of the ventilation resistance of the material layer by this technical solution are limited. And when the grate bar trolley moves towards the calcination section after being covered with coal gangue above, the air distribution pipe located in the material layer will have a certain pulling effect on the lower end of the material layer, easily causing the situation of material layer deviation or even collapse, thus affecting the subsequent normal calcination. Therefore, in view of the above technical problems and deficiencies of the existing coal gangue belt-type decarbonization sintering machine, this application proposes a coal gangue belt-type decarbonization sintering machine with improved structure and low ventilation resistance. Summary of the Invention

[0005] The purpose of the present invention is to provide a coal gangue belt-type decarbonization sintering machine with low ventilation resistance, so as to solve the problem that when the existing belt-type decarbonization sintering machine calcines coal gangue, it is necessary to reduce the ventilation resistance of the relatively thick material layer, improve the sintering speed and ensure the sintering effect.

[0006] The present invention is achieved through the following technical solutions: A coal gangue belt-type decarbonization sintering machine with low ventilation resistance includes a plurality of grate bar trolleys that move cyclically along the track box with a belt-type conveyor. Above one end of the track box, there is a feeding unit, and at the other end, there is a crushing and discharging unit. Below the upper row of grate bar trolleys, a plurality of air extraction hoods are arranged side by side. The air extraction hoods are connected to an air extraction fan through air extraction pipes. Above the grate bar trolleys near the feeding unit side, there is an ignition device, and between the ignition device and the feeding unit, there is a hole-punching and material-loosening mechanism; The hole-punching and material-loosening mechanism includes a gantry frame arranged across the moving direction of the grate bar trolleys. In the gantry frame, there is a strip box, and a cylinder for driving the strip box to move up and down is arranged on the gantry frame. The lower surface of the strip box communicates with a row of end pipes, and the lower ends of the end pipes communicate with hole-punching pipes. The hole-punching pipes are concentric with the end pipes and have a smaller diameter than the end pipes. Air outlet holes are opened on the hole-punching pipes. In each hole-punching pipe, there is an activity extraction rod with a sealed top end extending out of the strip box. The upper ends of the plurality of activity extraction rods are commonly connected to a lifting plate. On the gantry frame, there is a lifting mechanism for realizing the up and down movement of the lifting plate. The side end of the strip box is connected to an external air source through an air delivery pipe.

[0007] As a further configuration of the above scheme, a magnetic attraction component is arranged between the lifting plate and the upper surface of the strip box, and the lifting mechanism includes a connecting rope connected to the lifting plate, and the upper end of the connecting rope is connected to a winding wheel, and the winding wheel is connected to the rotating motor through a rotating shaft.

[0008] As a further configuration of the above scheme, two bearing seats are provided at the upper end of the gantry, the rotating shaft is rotatably arranged between the two bearing seats, and one end of the rotating shaft is connected to the rotating motor through a one-way transmission.

[0009] As a further arrangement of the above scheme, a sealing plate is connected to the side end of the strip box, an air inlet connected to the interior of the strip box is opened at the upper end of the sealing plate, an air connecting pipe corresponding to the air inlet is connected to the lower end of the side of the gantry, and the air connecting pipe is connected to the air supply pipe through a solenoid valve.

[0010] As a further configuration of the above scheme, the external gas source includes a high-temperature gas compressor connected to a gas pipeline, the air inlet end of the high-temperature gas compressor is connected to a heat exchanger through a pipeline, and the heat source medium in the heat exchanger is connected to the exhaust end of the exhaust fan through a pipeline.

[0011] As a further configuration of the above scheme, the movable draw rod is arranged to fit the inner wall of the perforated tube, and the lower end of the movable draw rod extending out of the perforated tube is connected with a pointed cone head.

[0012] As a further configuration of the above scheme, the shape of the air outlet holes is circular or waist-shaped, and the air outlet holes are evenly arranged along the length direction and circumferential direction of the perforated tube.

[0013] As a further configuration of the above scheme, a cross frame is provided at the lower end of the gantry, and a row of shovel barrels for passing through the perforated pipes and cleaning the outer walls of the perforated pipes are provided on the cross frame.

[0014] As a further arrangement of the above scheme, a CCD camera facing the grate trolley is installed on the track box near the lower side of the material laying unit, and a cleaning roller assembly for processing the grate trolley is installed in the track box above the CCD camera, and the CCD camera and the cleaning roller assembly are electrically connected to the control system of the coal gangue belt decarbonization sintering machine.

[0015] During the operation of the coal gangue belt decarbonization sintering machine disclosed in the present invention, the grate bar trolley conveys the coal gangue material layer with paving completed to the lower part of the hole punching and material loosening mechanism, and then the hole punching and material loosening mechanism punches holes and loosens the material layer. During specific operation, the air cylinder pushes the strip box downward, so that a row of hole punching pipes on the lower surface of the strip box extends into the material layer (at this time, since the movable draw rod is inserted into the hole punching pipe, it can not only seal the hole punching pipe, but also enhance the bending resistance of the whole hole punching pipe). Then, the lifting mechanism pulls out the movable draw rod in the hole punching pipe upward, so that the hole punching pipe is communicated with the strip box. Then, external high-temperature and high-pressure gas is introduced into the strip box, and the introduced high-temperature and high-pressure gas will be discharged from the air outlet holes on the outer cylindrical surface of the hole punching pipe and its bottom. After being discharged, the high-temperature and high-pressure gas will flow along the material layer at the corresponding depth. On the one hand, it can preheat and dry the coal gangue material, and on the other hand, it can make the originally paved coal gangue material layer softer and the internal pores larger. Combined with the hole punching effect of the hole punching pipe on the material layer, it can effectively reduce the ventilation resistance of the whole material layer.

[0016] The coal gangue material with reduced ventilation resistance then moves with the grate bar trolley to the ignition device for rapid ignition. After ignition is completed, it enters the calcination section, and the air extraction hood continuously extracts air from the bottom of the grate bar trolley, so that the coal gangue material layer burns and decarbonizes from top to bottom. After sintering is completed, it moves with the grate bar trolley to the crushing and discharging unit, and the single hammer crusher in the crushing and discharging unit crushes and discharges it.

[0017] In addition, during the process after the grate bar trolley finishes discharging and is conveyed to the paving unit again, first, the CCD camera takes pictures and captures the picture of its base, and then further judges whether the grate holes on the grate bar trolley are blocked. Once the blocking situation is found, the cleaning roller assembly is started, so that the brush filaments on the surface of the cleaning roller clean and dredge the grate holes during the high-speed rotation, avoiding the situation that the ventilation resistance increases subsequently due to the blockage of the grate holes in the grate bar trolley.

[0018] Compared with the prior art, the present invention has the following beneficial effects: Through the design of the hole punching and material loosening mechanism, the coal gangue belt decarbonization sintering machine disclosed in the present invention can punch holes and loosen the material layer by the hole punching and material loosening mechanism before the material layer paved on the grate bar trolley is ready for ignition and combustion, so that the ventilation resistance of the material layer is lower than that of the material layer on the traditional grate bar trolley. It can not only effectively reduce the fan power in the calcination section, but also reduce the coal gangue calcination and decarbonization time, improve the sintering efficiency, and effectively ensure the performance of the finally prepared product at the same time.

[0019] The present invention further visually judges the blockage condition of the grate holes of the grate trolley before it is sent back after discharging, and can start the cleaning roller assembly immediately after detecting the blockage of the grate holes, so as to dredge the grate holes in the grate trolley, further reducing the ventilation resistance during the subsequent calcination process of coal gangue.

[0020] In the present invention, the external heat source of the hole-punching and material-loosening mechanism absorbs and utilizes the heat in the combustion tail gas through a heat exchanger, then compresses the heat-exchanged high-temperature gas and discharges it into the hole-punching and material-loosening mechanism. Subsequently, the high-temperature and high-pressure gas flows into the coal gangue material layer through the hole-punching pipe. It can not only preheat and dry the coal gangue material, reducing the subsequent ignition duration and gas consumption, but also make the material layer softer, reducing the ventilation resistance of the whole material layer. At the same time, it also realizes the effective utilization of the heat for coal gangue calcination, having the advantages of energy conservation and environmental protection. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a schematic plan view of the whole of the present invention; Figure 2 It is a schematic plan view of the hole-punching and material-loosening mechanism of the present invention acting on the coal gangue material layer; Figure 3 It is a schematic three-dimensional view of the hole-punching and material-loosening mechanism of the present invention; Figure 4 It is a schematic three-dimensional view of the first part of the hole-punching and material-loosening mechanism of the present invention; Figure 5 It is a schematic three-dimensional view of the second part of the hole-punching and material-loosening mechanism of the present invention; Figure 6 For the present invention Figure 5 The enlarged schematic view of part A in it. Detailed Embodiments

[0023] In order to enable those skilled in the art to better understand the solutions of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 - 6 , and describes the application in detail with reference to embodiments. Example 1

[0025] Example 1 discloses a coal gangue belt decarbonization sintering machine with low ventilation resistance, Figure 1 , including a track box 1, a grate trolley 2, a material laying unit 3 and a crushing and unloading unit 4. The track box 1 is arranged horizontally, and a driving roller group 5 is rotatably arranged at the left and right ends of the track box 1, one of the driving roller groups 5 is connected to a power motor 6 through a chain, and then a belt conveyor 7 is arranged between the two driving roller groups 5. A plurality of grate trolleys 2 are arranged at equal intervals along the periphery of the belt conveyor 7, and the rollers at the front and rear ends of the grate trolley 2 act on the closed-loop track on the track box 1. Under the driving action of the belt conveyor 7, all the grate trolleys 2 move from the material laying unit 3 to one side of the crushing and unloading unit 4.

[0026] A plurality of exhaust hoods 8 are arranged side by side below the upper row of grate trolleys 2, and the upper end opening of the exhaust hood 8 is arranged opposite to the lower surface of the grate trolley 2, and then the exhaust hood 8 is connected to the exhaust fan 9 through an exhaust pipe, so that during the ignition and calcination of the coal gangue layer on the grate trolley 2, the exhaust hood 8 can provide the coal gangue layer with flowing air from top to bottom, thereby providing oxygen for the calcination and decarbonization of the coal gangue.

[0027] An ignition device 11 is arranged above the grate trolley 2 near the side of the material laying unit 3, and a punching and loosening mechanism 10 is arranged between the ignition device 11 and the material laying unit 3. After the material laying unit 3 lays the gangue material on the grate trolley 2 to form a material layer with a thickness of 900-1000mm, it moves to the position of the punching and loosening mechanism 10, and the punching and loosening mechanism 10 processes the gangue material layer to reduce its ventilation resistance, and finally moves to the ignition device 11 for ignition, and after ignition, exhaust calcination is performed along the entire calcination section.

[0028] Reference Figures 2 - 6 The key transformation in this embodiment 1 is the design of the piercing and loosening mechanism 10, which includes a gantry 101 arranged across the moving direction of the grate trolley 2, and a strip box 102 is arranged in the gantry 101. Cylinders 103 for jointly driving the strip box 102 to rise and fall are arranged at both ends of the upper surface of the gantry 101, and a guide rod 104 passing through the top of the gantry 102 is arranged on the strip box 102, thereby ensuring that the strip box 102 can move stably up and down under the drive of the cylinder 103.

[0029] A plurality of end pipes 105 are connected in a row on the lower surface of the strip box 102. The lower end of the end pipe 105 is connected to a punching pipe 106. The punching pipe 106 is concentric with the end pipe 105 and its own diameter is smaller than the diameter of the end pipe 105. Its length is set at 1200 mm according to the thickness of the material layer. Then, air outlet holes 1061 are formed on the outer surface of the punching pipe 106. The shape of the air outlet holes 1061 can be circular or oblong, and they are uniformly arranged along its length direction and circumferential direction. An active draw rod 107 that fits against the inner wall of the punching pipe 106 is arranged in the punching pipe 106. When the active draw rod 107 is fully inserted into the punching pipe 106, all the air outlet holes 1061 can be sealed. The lower end of the active draw rod 107 extends out of the bottom end of the punching pipe 106 and is provided with a sharp cone head 1071, so as to facilitate the punching pipe 106 and the active draw rod to be inserted into the material layer together. The upper end of the active draw rod 107 penetrates through the upper surface of the end pipe 105 and the strip box 102 and extends out, and a seal is made at the position where the active draw rod 107 extends out of the upper surface of the strip box 102 to prevent the gas in the strip box 102 from leaking from here.

[0030] A lifting plate 108 is commonly connected to the tops of all the active draw rods 107. And a magnetic attraction assembly 109 is arranged between the lifting plate 108 and the upper surface of the strip box 102. Specifically, the magnetic assembly 109 can be multiple groups of mutually attracting magnets respectively arranged on the lifting plate 108 and the strip box 102. Then, a lifting mechanism for lifting the lifting plate 108 is arranged at the upper end of the gantry 101. Specifically, the lifting mechanism includes two bearing seats 110 arranged at the upper end of the gantry 101. A rotating shaft 111 is rotatably connected between the two bearing seats 110. One end of the rotating shaft 111 is connected to a rotating motor 112 through a one-way transmission, and then a winding wheel 113 is arranged on the rotating shaft 111. A connecting rope 114 connected to the lifting plate 108 is wound around the winding wheel 113.

[0031] An air connection pipe 115 is connected to the lower end of one side of the gantry 101, and a corresponding solenoid valve 116 is arranged on the air connection pipe 115. Then, the outer end of the air connection pipe 115 is connected to an external air source through an air delivery pipe 117. A sealing plate 118 is connected to the end of the strip box 102, and a guiding groove 120 adapted to the sealing plate 118 is arranged on the inner side surface of the gantry 101. An air inlet 119 communicating with the inside of the strip box 102 is formed at the upper end of the sealing plate 118. When the air inlet 119 is aligned with the air connection pipe 115 and the solenoid valve 116 is opened, external gas can be introduced into the inside of the strip box 102 through the air delivery pipe 117.

[0032] Finally, a cross frame 121 is also provided at the lower end of the gantry 101. The cross frame 121 is arranged above the upper row of grate bar trolleys 2 to avoid hindering the movement of the grate bar trolleys 2. A row of material shoveling cylinders 122 for passing through the punching pipes 106 are provided on the cross frame 121. The lower end of the material shoveling cylinder 122 is designed with an annular blade and the inner diameter is equal to the outer diameter of the punching pipe 106, and the upper end is designed as an expanded frustum of a cone, so as to facilitate inserting the punching pipe 106 into the material shoveling cylinder 122. When the punching pipe 106 is pulled out from the coal gangue stone layer, the residual coal gangue on its surface will be shoveled off and cleaned by the material shoveling cylinder 122.

[0033] In addition, the external air source in the first embodiment includes a high-temperature gas compressor 12. The intake end of the high-temperature gas compressor 12 is connected with a heat exchanger 13 through a pipeline. The heat source medium of the heat exchanger 13 is part of the high-temperature flue gas discharged from the induced draft fan 9. The air entering the high-temperature gas compressor 12 is first heated and raised in temperature by the heat exchanger 13, and then pressurized by the high-temperature gas compressor 12 and introduced into the strip box 102 after pressurization.

[0034] During the operation of the coal gangue belt decarbonization sintering machine disclosed in the first embodiment, first, the coal gangue is evenly spread on the grate bar trolleys 2 by the paving unit 3, and then the grate bar trolleys 2 paved with coal gangue are conveyed to the position of the punching and loosening mechanism 10 under the action of the belt conveyor 7.

[0035] When the punching and loosening mechanism 10 is in operation, first, the cylinder 103 pushes the strip box 102 downward. At this time, the movable draw rod 107 penetrates through the punching pipe 106 and is firmly fixed to the strip box 102 under the action of the magnetic attraction assembly 109. Therefore, as the strip box 102 moves downward, the movable draw rod 107 and the punching pipe 106 can jointly punch holes in the material layer. At the same time, since the rotating shaft 111 is connected to the rotating motor 112 through a one-way transmission, the winding wheel 113 can synchronously unwind the connecting rope 114.

[0036] Until the air inlet 119 on the side end sealing plate 118 of the strip box 102 is aligned with the connecting air pipe 115, at this time, a part of the punching tube 106 extends into the material layer. Then, start the rotary motor 112 to make the winding wheel 113 rotate along with the rotating shaft 111. During the rotation of the winding wheel 113, the connecting rope 114 is wound, so as to pull the lifting plate 108 and the movable draw rod 107 upward together until the lower end of the movable draw rod 107 extends into the end tube 105, making the inside of the punching tube 106 communicate with the strip box 102. Subsequently, open the solenoid valve 116, and the high-temperature and high-pressure gas generated by the high-temperature gas compressor 12 enters the strip box 102 and quickly discharges from the air outlet hole 1061 and the bottom of the punching tube 106. When the discharged high-temperature and high-pressure gas pre-dries the coal gangue material layer, it can play a good role in loosening the coal gangue material around the punching holes. Combined with the punching effect, the ventilation resistance of the entire coal gangue material layer can be effectively reduced.

[0037] The coal gangue material processed by the punching and loosening mechanism 10 for multiple times moves to the ignition device 11 with the grate bar trolley 2 and is ignited. After ignition, it is moved and conveyed to the calcination section, and the air extraction hood 8 and the air extraction fan 9 continuously extract air from the bottom of the grate bar trolley 2, so that the coal gangue material layer is calcined and decarbonized from top to bottom. Finally, after sintering is completed, it moves to the crushing and discharging unit 4 with the grate bar trolley 2, and then is crushed and discharged by the single-hammer crusher in the crushing and discharging unit 4. Embodiment 2

[0038] Embodiment 2 discloses a coal gangue belt type decarbonization sintering machine which is further optimized and improved based on the technical solution in Embodiment 1, and the same parts as those in Embodiment 1 will not be described again.

[0039] Refer to the appendix Figure 1 As shown in the figure, in this Embodiment 2, a CCD camera 14 facing the grate bar trolley 2 is installed on the track box 1 below the side close to the feeding unit 3, and the CCD camera 14 is electrically connected to the entire sintering machine control system. A cleaning roller 15 is installed in the track box 1 above the CCD camera 14. One end of the cleaning roller 15 is connected to a cleaning motor (not shown in the figure) through a transmission part (which can be a belt or a transmission chain), and brush filaments that can act on the bottom wall of the grate bar trolley 2 are arranged on the roller body of the cleaning roller 15. And the cleaning motor is also electrically connected to the entire sintering machine control system, so that it is actively controlled by the control system to realize start and stop.

[0040] In Embodiment 2, through the above-mentioned design, when the grate car 2 that has unloaded the material and moves towards the material spreading unit 3 is photographed by the CCD camera 14, the taken photo is processed and compared by the entire sintering machine control system, so as to determine whether the grate holes on the base of the grate car 2 are blocked (when the blocked area of the grate holes ≥ 10% of the total area of the grate holes, it is determined that there is a blockage). Once a blockage is found, the control system controls the cleaning motor to operate, so that the cleaning roller 15 rotates. When the grate car 2 moves past the position of the cleaning roller 15, the brush filaments on the cleaning roller 15 dredge and clean the grate holes, effectively solving the problem that the subsequent air extraction hood 8 has an increased air extraction resistance at the bottom of the grate car 2 due to the blockage of the grate holes on the grate car 2.

[0041] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gangue belt decarbonization sintering machine with low ventilation resistance, comprising a plurality of grate bar trolleys that move cyclically along a track box with a belt conveyor member. A feeding unit is arranged above one end of the track box, and a crushing and discharging unit is arranged at the other end. A plurality of air extraction hoods are arranged side by side below the upper row of the grate bar trolleys. The air extraction hoods are connected to an air extraction fan through air extraction pipes, and it is characterized in that, An ignition device is arranged above the grate car on one side close to the feeding unit, and a hole-punching and material-loosening mechanism is arranged between the ignition device and the feeding unit; The hole-punching and material-loosening mechanism includes a gantry arranged across the moving direction of the grate car. A strip box is arranged in the gantry, and a cylinder for driving the strip box to move up and down is arranged on the gantry. A row of end pipes is communicated with the lower surface of the strip box, and the lower ends of the end pipes are communicated with hole-punching pipes. The hole-punching pipes are concentric with the end pipes and have a smaller diameter than the end pipes. Air outlet holes are formed in the hole-punching pipes. An active extraction rod with a sealed top extending out of the strip box is inserted into each hole-punching pipe. The upper ends of the plurality of active extraction rods are jointly connected with a lifting plate. A lifting mechanism for realizing the up and down movement of the lifting plate is arranged on the gantry. The side end of the strip box is connected with an external air source through an air delivery pipe.

2. The gangue belt-type decarbonization sintering machine with low ventilation resistance according to claim 1, wherein, A magnetic attraction assembly is arranged between the lifting plate and the upper surface of the strip box. The lifting mechanism includes a connecting rope connected with the lifting plate, and the upper end of the connecting rope is connected with a winding wheel. The winding wheel is connected with a rotating motor through a rotating shaft.

3. The gangue belt decarbonization sintering machine with low ventilation resistance according to claim 2, characterized in that, Two bearing seats are arranged at the upper end of the gantry, and the rotating shaft is rotatably arranged between the two bearing seats. One end of the rotating shaft is connected with the rotating motor through a one-way transmission.

4. The gangue belt type decarbonization sintering machine with low ventilation resistance according to claim 1, characterized in that, A sealing plate is connected to the side end of the strip box, and an air inlet communicated with the inside of the strip box is formed at the upper end of the sealing plate. An air connecting pipe opposite to the air inlet is connected to the lower end of the side surface of the gantry. The air connecting pipe is connected with the air delivery pipe through an electromagnetic valve.

5. The gangue belt type decarbonization sintering machine with low ventilation resistance according to claim 4, characterized in that, The external air source includes a high-temperature gas compressor connected with the air delivery pipe. The air inlet end of the high-temperature gas compressor is connected with a heat exchanger through a pipeline, and the heat source medium in the heat exchanger is connected with the exhaust end of a draft fan through a pipeline.

6. The gangue belt decarbonization sintering machine with low ventilation resistance according to claim 1, characterized in that, The active extraction rod is arranged in fit with the inner wall of the hole-punching pipe, and a pointed cone head is connected to the lower end of the active extraction rod extending out of the hole-punching pipe.

7. The gangue belt decarbonization sintering machine with low ventilation resistance according to claim 1, characterized in that, The shape of the air outlet hole is one of a circle or an oblong, and the air outlet holes are uniformly arranged along the length direction and the circumferential direction of the hole-punching pipe.

8. The gangue belt decarbonization sintering machine with low ventilation resistance according to claim 1, characterized in that A cross frame is arranged at the lower end of the gantry, and a row of shoveling material cylinders for passing through the hole-punching pipes and cleaning the outer walls of the hole-punching pipes are arranged on the cross frame.

9. The gangue belt decarbonization sintering machine with low ventilation resistance according to any one of claims 1-8, characterized in that, A CCD camera facing the grate car is installed on the track box below and on one side close to the feeding unit. A cleaning roller assembly for processing the grate car is installed in the track box above the CCD camera. The CCD camera and the cleaning roller assembly are both electrically connected with the control system of the coal gangue belt type decarbonization sintering machine.

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