Coal conveying device for boiler

Abstract

The invention discloses a coal conveying device for a boiler, and relates to the technical field of coal conveying, the coal conveying device comprises a conveying frame, and a buffer structure used for reducing coal descending impact force, a coal conveying structure used for conveying coal and an iron conveying structure used for conveying iron impurities are arranged in the conveying frame; the buffering structure and the iron transportation structure are located above the coal transportation structure, and the buffering structure is located on the left side of the iron transportation structure. A feeding hopper is fixed to the left side of the upper end of the conveying frame and located over the buffering structure, and a separation frame is fixed into the feeding hopper. Through cooperation of the separation frame, the triangular rod and the processing structure, the rotating unit is driven by the first motor, so that the extrusion unit forms extrusion action above the triangular rod, and large coal blocks are effectively crushed; and meanwhile, by means of the wedge-shaped structure of the triangular rod and rotation of the first rotating rod and the second rotating rod, secondary dispersion of the coal is achieved, and therefore large coal blocks are prevented from directly impacting the conveying belt, and the conveying device is protected against damage.

Description

Technical Field

[0001] The present invention relates to the technical field of coal conveying, and specifically to a coal conveying device for boilers. Background Art

[0002] In the process of conveying coal for boilers, traditional technologies often face many challenges. First of all, large coal lumps are likely to directly impact the conveyor belt during the conveying process. This not only causes damage to the conveying equipment, increases maintenance costs, but also may affect the conveying efficiency and even lead to safety accidents. Secondly, a large impact force is generated when the coal descends, which poses a serious threat to the conveyor belt and subsequent equipment, and will significantly shorten the service life of the equipment in the long run.

[0003] More critically, iron impurities are often contained in the coal, and these impurities are difficult to effectively separate during the conveying process. This not only reduces the purity of the coal, but also may cause damage to subsequent equipment such as boilers.

[0004] Based on this, a coal conveying device for boilers is now provided, which can eliminate the drawbacks of existing devices. Summary of the Invention

[0005] The purpose of the present invention is to provide a coal conveying device for boilers to solve the problems of direct impact of large coal lumps on the conveyor belt and difficulty in effectively separating iron impurities in the coal in the background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A coal conveying device for boilers, comprising

[0008] Preferably, the processing structure includes a rotating unit and an extrusion unit. The rotating unit includes a motor 1 installed on the outer wall of the right side of the feeding hopper. The output end of the motor 1 extends into the partition frame and is fixedly connected to one end of a rotating rod 1. The other end of the rotating rod 1 extends to the outer wall of the left side of the feeding hopper and is fixedly connected to a gear 1. The gear 1 meshes with two gears 2 on its two sides. The two gears 2 are connected to the extrusion unit. Each gear 2 is fixed to one end of a rotating rod 2. The rotating rod 1 and the two rotating rods 2 are rotatably connected to the partition frame and a triangular rod.

[0009] Preferably, the extrusion unit includes two turntables. Each turntable is fixed to a gear 2. A fixed rod is fixed at a position deviating from the center of the left end of the turntable. The fixed rod is rotatably connected to one end of a connecting plate. The other end of the connecting plate is rotatably connected to a connecting rod. The right end of the connecting rod is fixedly connected to a connecting bar. The other end of the connecting bar is fixedly connected to a push rod. The other end of the push rod extends into the feeding hopper and is fixedly connected to an extrusion plate. The two extrusion plates are located above the triangular rod.

[0010] Preferably, the buffer structure includes two triangular plates symmetrically fixed to the front and rear sides of the inner wall of the conveying frame. A buffer member is provided at the upper ends of the two triangular plates, and the buffer member is hinged to the inner wall of the conveying frame. A pushing unit for jittering the buffer member is provided between the two triangular plates.

[0011] Preferably, the buffer member includes a buffer plate. One end of the buffer plate is rotatably connected to the inside of the conveying frame. A buffer cavity is provided at the upper end of the buffer plate. A plurality of dampers and damping springs are provided in the buffer cavity. The dampers are located inside the damping springs. A bearing plate is fixed to the upper ends of the plurality of dampers and damping springs.

[0012] Preferably, the pushing unit includes a second motor installed at the rear end of the conveying frame. The output end of the second motor extends between the two triangular plates and is fixedly connected to a cam. The other end of the cam is fixedly connected to a first synchronous pulley. The first synchronous pulley is rotatably installed at the front end of the conveying frame. The first synchronous pulley is connected to the coal transportation structure through a first synchronous belt.

[0013] Preferably, the coal transportation structure includes a second synchronous pulley rotatably installed at the front end of the conveying frame. The second synchronous pulley is connected to the first synchronous pulley through a first synchronous belt. The rear end of the second synchronous pulley extends into the conveying frame and is fixedly connected to a first transport roller. The other end of the first transport roller is fixedly connected to a third synchronous pulley. The third synchronous pulley is drivingly connected to a fourth synchronous pulley through a second synchronous belt. The fourth synchronous pulley is fixed to one end of a second transport roller. Coal transportation belts are sleeved on the outer walls of the first transport roller and the second transport roller. The other end of the second transport roller is fixedly connected to a fifth synchronous pulley. The fifth synchronous pulley is connected to the iron transportation structure through a third synchronous belt.

[0014] Preferably, the iron transportation structure includes a sixth synchronous pulley installed at the front end of the conveying frame. The sixth synchronous pulley is connected to the fifth synchronous pulley through a third synchronous belt. The sixth synchronous pulley is fixed to one end of a third transport roller. The other end of the third transport roller is fixedly connected to a seventh synchronous pulley. The seventh synchronous pulley is connected to an eighth synchronous pulley through a fourth synchronous belt. The eighth synchronous pulley is fixed to one end of a fourth transport roller. Iron transportation belts are sleeved on the outer walls of the third transport roller and the fourth transport roller. The iron transportation belts are located above the coal transportation belts.

[0015] Preferably, a ninth synchronous pulley is fixed to the other end of the fourth transport roller. The ninth synchronous pulley is drivingly connected to a tenth synchronous pulley through a fifth synchronous belt. The tenth synchronous pulley is fixed to one end of a magnetic roller, and the magnetic roller is located above the coal transportation belt. A scraper is fixed to the inner wall of the conveying frame. The top end of the scraper is in contact with the outer wall of the magnetic roller, and the bottom end of the scraper is located above the iron transportation belt.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. The present invention combines a partition frame, triangular rods, and a processing structure. By driving a rotating unit with a first motor, an extrusion unit forms an extrusion action above the triangular rods, effectively crushing large coal blocks. At the same time, by utilizing the wedge-shaped structure of the triangular rods and the rotation of the first rotating rod and the second rotating rod, secondary dispersion of the coal is achieved, thereby preventing large coal blocks from directly impacting the conveyor belt and protecting the conveying device from damage.

[0018] 2. The present invention combines a buffer member and a pushing unit. The buffer member in the buffer structure works in cooperation with a damping spring and a damper to convert the kinetic energy during the impact of the coal into elastic potential energy, significantly reducing the impact force when the coal descends and protecting the conveyor belt from excessive impact. The second motor of the pushing unit drives the cam to rotate, causing the buffer plate to vibrate periodically, which not only prevents the coal from accumulating on the surface of the buffer member but also accelerates the transition of the coal to the conveyor belt through vibration, improving the conveying efficiency.

[0019] 3. In the iron transport structure of the present invention, a magnetic roller can adsorb ferromagnetic impurities in the coal, and a scraper scrapes off the adsorbed iron filings onto the iron conveyor belt, achieving effective separation and transportation of the ferromagnetic impurities and significantly improving the purity of the coal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural view of the front end position of the present invention.

[0021] Figure 2 It is a schematic structural view of the rear end position of the present invention.

[0022] Figure 3 It is a schematic structural view of the processing structure of the present invention.

[0023] Figure 4 It is a schematic structural view of the extrusion unit of the present invention.

[0024] Figure 5 It is a schematic structural view of the buffer structure of the present invention.

[0025] Figure 6 It is a schematic structural view of the buffer member of the present invention.

[0026] Figure 7 It is a schematic structural view of the front end position of the coal transport structure and the iron transport structure of the present invention.

[0027] Figure 8 It is a schematic structural view of the rear end position of the coal transport structure and the iron transport structure of the present invention.

[0028] Annotation of the reference numerals: 1. Conveyor frame; 2. Feeding hopper; 21. Partition frame; 22. Triangular rod; 3. Processing structure; 31. Rotating unit; 311. Motor 1; 312. Rotating rod 1; 313. Gear 1; 314. Gear 2; 315. Rotating rod 2; 32. Extrusion unit; 321. Turntable; 322. Fixed rod; 323. Connecting plate; 324. Link rod; 325. Connecting rod; 326. Push rod; 327. Extrusion plate; 4. Buffer structure; 41. Triangular plate; 42. Buffer member; 421. Buffer plate; 422. Buffer chamber; 423. Damper; 424. Damping spring; 425. Bearing plate; 43. Pushing unit; 431. Motor 2; 432. Cam; 433. Synchronous pulley 1; 434. Timing belt 1; 5. Coal transportation structure; 511. Synchronous pulley 2; 512. Transportation roller 1; 513. Synchronous pulley 3; 514. Timing belt 2; 515. Synchronous pulley 4; 516. Transportation roller 2; 517. Synchronous pulley 5; 518. Timing belt 3; 519. Coal transportation belt; 6. Ferrous transportation structure; 611. Synchronous pulley 6; 612. Transportation roller 3; 613. Synchronous pulley 7; 614. Timing belt 4; 615. Synchronous pulley 8; 616. Transportation roller 4; 617. Synchronous pulley 9; 618. Timing belt 5; 619. Ferrous transportation belt; 620. Synchronous pulley 10; 621. Magnetic roller; 622. Scraper. Detailed implementation manners

[0029] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] In one embodiment, as Figures 1 - 8 shown, a coal conveying device for a boiler includes a conveyor frame 1. A buffer structure 4 for reducing the impact force of the falling coal, a coal transportation structure 5 for transporting coal, and a ferrous transportation structure 6 for transporting ferrous impurities are arranged inside the conveyor frame 1. The buffer structure 4 and the ferrous transportation structure 6 are located above the coal transportation structure 5, and the buffer structure 4 is located on the left side of the ferrous transportation structure 6;

[0031] A feeding hopper 2 is fixed to the upper left side of the conveyor frame 1. The feeding hopper 2 is located directly above the buffer structure 4. A partition frame 21 is fixed inside the feeding hopper 2. A plurality of triangular rods 22 are fixedly arranged at equal intervals inside the partition frame 21. A processing structure 3 is arranged inside the feeding hopper 2.

[0032] In this embodiment, coal enters through the feeding hopper 2 and encounters the partition frame 21 and the triangular rods 22. The processing structure 3 processes the coal. The processed coal falls onto the coal transportation structure 5 after passing through the buffer structure 4, and the ferrous transportation structure 6 separates and transports the ferrous impurities in the coal.

[0033] In an alternative embodiment, asFigures 3 - 4 As shown in the figure, the processing structure 3 includes a rotating unit 31 and an extrusion unit 32. The rotating unit 31 includes a first motor 311 installed on the right outer wall of the feeding hopper 2. The output end of the first motor 311 extends into the inner part of the partition frame 21 and is fixedly connected to one end of a first rotating rod 312. The other end of the first rotating rod 312 extends to the left outer wall of the feeding hopper 2 and is fixedly connected to a first gear 313. The first gear 313 meshes with two second gears 314 on its two sides. The two second gears 314 are connected to the extrusion unit 32. Each second gear 314 is fixedly connected to one end of a second rotating rod 315. The first rotating rod 312 and the two second rotating rods 315 are rotatably connected to the partition frame 21 and the triangular rod 22.

[0034] Among them, the extrusion unit 32 includes two turntables 321. Each turntable 321 is fixedly connected to a second gear 314. A fixed rod 322 is fixed at a position deviated from the center of the left end of the turntable 321. The fixed rod 322 is rotatably connected to one end of a connecting plate 323. The other end of the connecting plate 323 is rotatably connected to a connecting rod 324. The right end of the connecting rod 324 is fixedly connected to a connecting bar 325. The other end of the connecting bar 325 is fixedly connected to a push rod 326. The other end of the push rod 326 extends into the feeding hopper 2 and is fixedly connected to an extrusion plate 327. The two extrusion plates 327 are located above the triangular rod 22.

[0035] It should be noted that when the coal is put into the feeding hopper 2, it first contacts the partition frame 21 and the triangular rod 22.

[0036] The first motor 311 drives the first rotating rod 312 to rotate, and through the first gear 313 and the two second gears 314 on both sides, the two turntables 321 generate reverse rotational movements. The fixed rod 322 drives the connecting plate 323 to make reciprocating swings. Through the transmission of the connecting rod 324 and the connecting bar 325, finally, the extrusion plate 327 forms a high-frequency extrusion action above the triangular rod 22.

[0037] This structure crushes large coal blocks through mechanical extrusion, and at the same time uses the wedge-shaped structure of the triangular rod 22 and the rotation of the first rotating rod 312 and the two second rotating rods 315 to realize the secondary dispersion of the coal, effectively preventing large coal blocks from directly impacting the conveyor belt.

[0038] In an alternative embodiment, as Figures 5 - 8 shown, the buffer structure 4 includes two triangular plates 41. The two triangular plates 41 are symmetrically fixed on the front and back sides of the inner wall of the conveyor frame 1. A buffer member 42 is arranged at the upper ends of the two triangular plates 41. The buffer member 42 is hinged to the inner wall of the conveyor frame 1. A pushing unit 43 for jittering the buffer member 42 is arranged between the two triangular plates 41.

[0039] Specifically, the buffer member 42 includes a buffer plate 421. One end of the buffer plate 421 is rotatably connected to the inside of the conveying frame 1. A buffer cavity 422 is formed at the upper end of the buffer plate 421. A plurality of dampers 423 and damper springs 424 are arranged in the buffer cavity 422. The dampers 423 are located inside the damper springs 424. A bearing plate 425 is fixed to the upper ends of the plurality of dampers 423 and damper springs 424.

[0040] Among them, the pushing unit 43 includes a second motor 431 installed at the rear end of the conveying frame 1. The output end of the second motor 431 extends between the two triangular plates 41 and is fixedly connected to a cam 432. The other end of the cam 432 is fixedly connected to a first synchronous pulley 433. The first synchronous pulley 433 is rotatably installed at the front end of the conveying frame 1. The first synchronous pulley 433 is connected to the coal transportation structure 5 through a first synchronous belt 434.

[0041] It should be noted that when the pre-treated coal falls onto the buffer structure 4, it first contacts the bearing plate 425. The buffer plate 421 of the buffer member 42 forms an elastic support surface through a hinged structure. When the coal impacts the bearing plate 425, the damper spring 424 and the built-in damper 423 work together to convert the impact kinetic energy into elastic potential energy. At this time, the second motor 431 of the pushing unit 43 drives the cam 432 to rotate, causing the buffer plate 421 to generate periodic vibrations, which not only prevents the coal from accumulating on the surface of the buffer member, but also accelerates the transition of the coal to the conveyor belt through vibration.

[0042] In an alternative embodiment, as Figures 7 - 8 shown, the coal transportation structure 5 includes a second synchronous pulley 511 rotatably installed at the front end of the conveying frame 1. The second synchronous pulley 511 is connected to the first synchronous pulley 433 through a first synchronous belt 434. The rear end of the second synchronous pulley 511 extends into the inside of the conveying frame 1 and is fixedly connected to a first conveying roller 512. The other end of the first conveying roller 512 is fixedly connected to a third synchronous pulley 513. The third synchronous pulley 513 is drivingly connected to a fourth synchronous pulley 515 through a second synchronous belt 514. The fourth synchronous pulley 515 is fixed to one end of a second conveying roller 516. A coal conveyor belt 519 is sleeved on the outer walls of the first conveying roller 512 and the second conveying roller 516. The other end of the second conveying roller 516 is fixedly connected to a fifth synchronous pulley 517. The fifth synchronous pulley 517 is connected to the iron transportation structure 6 through a third synchronous belt 518.

[0043] Among them, the iron transportation structure 6 includes a sixth synchronous pulley 611 installed at the front end of the conveying frame 1. The sixth synchronous pulley 611 is connected to a fifth synchronous pulley 517 through a third synchronous belt 518. One end of a third conveying roller 612 is fixed to the sixth synchronous pulley 611. A seventh synchronous pulley 613 is fixed to the other end of the third conveying roller 612. The seventh synchronous pulley 613 is connected to an eighth synchronous pulley 615 through a fourth synchronous belt 614. One end of a fourth conveying roller 616 is fixed to the eighth synchronous pulley 615. An iron transportation belt 619 is sleeved on the outer walls of the third conveying roller 612 and the fourth conveying roller 616. The iron transportation belt 619 is located above the coal transportation belt 519.

[0044] Among them, a ninth synchronous pulley 617 is fixed to the other end of the fourth conveying roller 616. The ninth synchronous pulley 617 is drivingly connected to a tenth synchronous pulley 620 through a fifth synchronous belt 618. One end of a magnetic roller 621 is fixedly connected to the tenth synchronous pulley 620. The magnetic roller 621 is located above the coal transportation belt 519. A scraper 622 is fixed to the inner wall of the conveying frame 1. The top end of the scraper 622 is in contact with the outer wall of the magnetic roller 621. The bottom end of the scraper 622 is located above the iron transportation belt 619.

[0045] It should be noted that the second motor 431 drives the first synchronous pulley 433 to rotate, and drives the second synchronous pulley 511 to rotate through the first synchronous belt 434. The first conveying roller 512 serves as the main driving roller and drives the second conveying roller 516 to rotate synchronously through the transmission of the third synchronous pulley 513, the second synchronous belt 514, and the fourth synchronous pulley 515. The coal transportation belt 519 ensures the stable transportation of coal. The fifth synchronous pulley 517 transmits the power to the iron transportation structure 6 through the third synchronous belt 518 to achieve the overall power coupling.

[0046] The sixth synchronous pulley 611 receives the power from the third synchronous belt 518 and drives the third conveying roller 612 to operate. When the materials on the coal transportation belt 519 pass by, the iron impurities are adsorbed on the surface of the magnetic roller 621. As the magnetic roller 621 rotates, the scraper 622 scrapes off the adsorbed iron filings onto the iron transportation belt 619. The transmission system of the seventh synchronous pulley 613, the fourth synchronous belt 614, and the eighth synchronous pulley 615 ensures that the fourth conveying roller 616 and the magnetic roller 621 rotate synchronously, and finally transports the iron impurities to the designated collection point.

[0047] The above embodiment discloses a coal conveying device for a boiler. Among them, the coal enters through the feeding hopper 2 and meets the partition frame 21 and the triangular rod 22. The first motor 311 drives the first rod 312 to rotate, and the first gear 313 and the second gear 314 cause the turntable 321 to rotate in the opposite direction. The fixed rod 322 drives the connecting plate 323 to swing. Through the transmission of the connecting rod 324 - rod 325, the pressing plate 327 presses and breaks the coal blocks frequently above the triangular rod 22. The wedge-shaped structure of the triangular rod 22 cooperates with the first rotating rod 312 and the second rotating rod 315 to disperse the coal for the second time to prevent large pieces from impacting the conveyor belt.

[0048] After pretreatment, the coal falls to the buffer structure 4 and contacts the bearing plate 425. The buffer plate 421 forms an elastic support surface through a hinge structure, and the damping spring 424 and the damper 423 cooperate to consume energy. The motor 2 431 drives the cam 432 to rotate, so that the buffer plate 421 periodically shakes to prevent accumulation and accelerate the transition of coal to the conveyor belt 519.

[0049] The motor 2 431 drives the synchronous wheel 2 511 through the synchronous wheel 1 433 and the synchronous belt 1 434, and the transport roller 1 512 is the main driving roller. The synchronous wheel 3 513, the synchronous belt 2 514, and the synchronous wheel 4 515 drive the transport roller 2 516 to operate synchronously, and the transport belt 519 stably transports coal. The synchronous wheel 517 transmits power to the iron transport structure 6 through the synchronous belt 3 518, realizing overall power coupling.

[0050] Synchronous wheel six 611 receives power from synchronous belt three 518 and drives transport roller three 612 to operate. When the coal conveyor belt 519 passes through, the magnetic roller 621 absorbs iron impurities, and the scraper 622 scrapes iron filings to the iron conveyor belt 619 as the roller rotates. Synchronous wheel seven 613, synchronous belt four 614, and synchronous wheel eight 615 drive to ensure that the transport roller four 616 is synchronized with the magnetic roller 621, and the iron impurities are transported to the designated collection point.

[0051] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A coal conveying device for a boiler, characterized in that, It includes a conveying frame (1), inside which there is a buffer structure (4) for reducing the impact force of the coal when it drops, a coal transportation structure (5) for transporting coal, and an iron transportation structure (6) for transporting ferromagnetic impurities. The buffer structure (4) and the iron transportation structure (6) are located above the coal transportation structure (5), and the buffer structure (4) is located on the left side of the iron transportation structure (6). On the left side of the upper end of the conveying frame (1), a feeding hopper (2) is fixed. The feeding hopper (2) is located directly above the buffer structure (4). Inside the feeding hopper (2), a partition frame (21) is fixed. Inside the partition frame (21), a number of triangular rods (22) are fixed at equal intervals. A processing structure (3) is arranged inside the feeding hopper (2).

2. The coal conveying device for a boiler according to claim 1, characterized in that, The processing structure (3) includes a rotating unit (31) and an extrusion unit (32). The rotating unit (31) includes a motor one (311) installed on the outer wall of the right side of the feeding hopper (2). The output end of the motor one (311) extends into the partition frame (21) and is fixedly connected to one end of a rotating rod one (312). The other end of the rotating rod one (312) extends to the outer wall of the left side of the feeding hopper (2) and is fixedly connected to a gear one (313). The gear one (313) meshes with two gear twos (314) on its two sides. The two gear twos (314) are connected to the extrusion unit (32). Each gear two (314) is fixed to one end of a rotating rod two (315). The rotating rod one (312) and the two rotating rods two (315) are rotatably connected to the partition frame (21) and the triangular rods (22).

3. The coal conveying device for a boiler according to claim 2, wherein, The extrusion unit (32) includes two turntables (321). Each turntable (321) is fixed to a gear two (314). At a position deviated from the center of its circle at the left end of the turntable (321), a fixed rod (322) is fixed. The fixed rod (322) is rotatably connected to one end of a connecting plate (323). The other end of the connecting plate (323) is rotatably connected to a connecting rod (324). The right end of the connecting rod (324) is fixedly connected to a connecting bar (325). The other end of the connecting bar (325) is fixedly connected to a push rod (326). The other end of the push rod (326) extends into the feeding hopper (2) and is fixedly connected to an extrusion plate (327). The two extrusion plates (327) are located above the triangular rods (22).

4. A coal conveying device for a boiler according to claim 1, characterized in that, The buffer structure (4) includes two triangular plates (41). The two triangular plates (41) are symmetrically fixed on the front and rear sides of the inner wall of the conveying frame (1). At the upper ends of the two triangular plates (41), a buffer member (42) is arranged. The buffer member (42) is hinged to the inner wall of the conveying frame (1). Between the two triangular plates (41), a pushing unit (43) for jittering the buffer member (42) is arranged.

5. A coal conveying device for a boiler according to claim 4, characterized in that, The buffer member (42) includes a buffer plate (421). One end of the buffer plate (421) is rotatably connected to the inside of the conveying frame (1). A buffer cavity (422) is formed at the upper end of the buffer plate (421). A plurality of dampers (423) and damper springs (424) are arranged in the buffer cavity (422). The dampers (423) are located inside the damper springs (424). A bearing plate (425) is fixed to the upper ends of the plurality of dampers (423) and damper springs (424).

6. A coal conveying device for a boiler according to claim 4, characterized in that, The pushing unit (43) includes a second motor (431) installed at the rear end of the conveying frame (1). The output end of the second motor (431) extends between the two triangular plates (41) and is fixedly connected to a cam (432). The other end of the cam (432) is fixedly connected to a first synchronous pulley (433). The first synchronous pulley (433) is rotatably installed at the front end of the conveying frame (1). The first synchronous pulley (433) is connected to the coal transportation structure (5) through a first synchronous belt (434).

7. A coal conveying device for a boiler according to claim 6, characterized in that, The coal transportation structure (5) includes a second synchronous pulley (511) rotatably installed at the front end of the conveying frame (1). The second synchronous pulley (511) is connected to the first synchronous pulley (433) through a first synchronous belt (434). The rear end of the second synchronous pulley (511) extends into the inside of the conveying frame (1) and is fixedly connected to a first transport roller (512). The other end of the first transport roller (512) is fixedly provided with a third synchronous pulley (513). The third synchronous pulley (513) is drivingly connected to a fourth synchronous pulley (515) through a second synchronous belt (514). The fourth synchronous pulley (515) is fixed to one end of a second transport roller (516). A coal transportation belt (519) is sleeved on the outer walls of the first transport roller (512) and the second transport roller (516). The other end of the second transport roller (516) is fixedly provided with a fifth synchronous pulley (517). The fifth synchronous pulley (517) is connected to the iron transportation structure (6) through a third synchronous belt (518).

8. A coal conveying device for a boiler according to claim 7, characterized in that, The iron transportation structure (6) includes a sixth synchronous pulley (611) installed at the front end of the conveying frame (1). The sixth synchronous pulley (611) is connected to the fifth synchronous pulley (517) through a third synchronous belt (518). The sixth synchronous pulley (611) is fixed to one end of a third transport roller (612). The other end of the third transport roller (612) is fixedly provided with a seventh synchronous pulley (613). The seventh synchronous pulley (613) is connected to an eighth synchronous pulley (615) through a fourth synchronous belt (614). The eighth synchronous pulley (615) is fixed to one end of a fourth transport roller (616). An iron transportation belt (619) is sleeved on the outer walls of the third transport roller (612) and the fourth transport roller (616). The iron transportation belt (619) is located above the coal transportation belt (519).

9. The coal conveying device for a boiler according to claim 8, characterized in that, At the other end of the fourth transport roller (616), a ninth synchronous pulley (617) is fixed. The ninth synchronous pulley (617) is drivingly connected to a tenth synchronous pulley (620) through a fifth synchronous belt (618). The tenth synchronous pulley (620) is fixedly connected to one end of a magnetic roller (621), and the magnetic roller (621) is located above the coal transport belt (519). A scraper (622) is fixed to the inner wall of the transport rack (1). The top end of the scraper (622) is in contact with the outer wall of the magnetic roller (621), and the bottom end of the scraper (622) is located above the iron transport belt (619).

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