Screening equipment for pulverized coal

Abstract

The utility model discloses a pulverized coal screening device which comprises a screening frame, the inner side of the screening frame is connected with a conveying belt in a winding mode through two transmission rollers, and one of the transmission rollers of the screening frame is provided with a first motor through a coupler. According to the screening device, the two second motors of the screening square cylinder are started to rotate the two square rollers respectively, the right-angle ends of the two square rollers are welded with the multiple material stirring columns, and the material stirring columns of the two square rollers are arranged in a staggered mode; impurities doped in coal powder in a falling state or larger coal briquettes are guided to corresponding side openings by two square rollers respectively, are transferred to an auxiliary coal outlet hopper under the action of a material guide plate and are discharged out of a screening square cylinder, and a third motor is started to promote a transmission belt to drive a supporting shaft and a cam on the surface of the supporting shaft to rotate, so that the coal powder is conveyed to the screening square cylinder. Due to the fact that the main coal outlet hopper abuts against the cam through the contact block, and the side lugs on the two sides of the main coal outlet hopper are connected with the T-shaped rods with the springs in a sleeved mode, the main coal outlet hopper can do reciprocating motion.

Description

Technical Field

[0001] The utility model relates to the technical field of screening equipment, in particular to a screening equipment for coal powder. Background Art

[0002] The combustible material used in thermal power plants is coal fuel. In order to ensure the full combustion of coal, it needs to be made into coal powder. The fineness of the coal powder determines its combustion effect. Too much fineness will lead to insufficient and incomplete combustion of the coal powder. Therefore, the coal powder needs to be screened before use.

[0003] After searching, announcement number CN217043409U discloses a fuel screening device for a thermal power plant, comprising a heated feed cover, a screening box movably mounted on the bottom of the heated feed cover, a discharge hopper fixedly mounted on the bottom of the screening box, a vibration base movably mounted on the bottom of the discharge hopper, and a vibration assembly movably mounted inside the vibration base. In the above scheme, the stirring device is movably mounted inside the hot air rack, and the stirring device is movably mounted inside the screening box, so that the fuel is dried and heated in the screening device, and at the same time, it is stirred by the first stirring blade, the connecting block is fixedly mounted on the bottom of the vibration base plate, and the rotating wheel is movably mounted under the raised block. The movement of the rotating wheel causes the discharge rack to shake, and the spring assembly, under the action of the pad, causes the discharge rack to shake and vibrate at the same time, making the screening effect more obvious, saving screening time, avoiding fuel agglomeration during screening, preventing large screening errors, and making the screening effect more ideal.

[0004] However, this solution does not have a corresponding impurity removal structure, which makes it inconvenient to clean up impurities or larger coal lumps online, and has the problem of poor screening and classification effect.

[0005] To this end, a screening device for coal powder is proposed, which has the advantages of easy classification and screening, and removal of debris or larger coal lumps, thereby solving the problems in the above-mentioned background technology. Utility Model Content

[0006] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a screening device for coal powder.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a screening device for coal powder, comprising a screening frame, the inner side of the screening frame is connected to a conveyor belt by winding two transmission rollers, and a first motor is installed on one of the transmission rollers of the screening frame through a coupling, a screening square drum is arranged above the conveyor belt, and the lower part of the screening square drum is welded to the inner wall of the screening frame, two second motors are fixedly installed on the upper surface of the screening square drum, and the output ends of the two second motors respectively pass through the screening square drum and are fixedly connected to square rollers, each right-angle end of the two square rollers is welded with a plurality of material-diverting columns, and the material-diverting columns of the two square rollers are staggered, and the square rollers A main coal hopper is provided at the bottom, and one end of the main coal hopper with an opening extends to the outside of the screening square cylinder, and a screen is welded to the bottom of the main coal hopper. A support shaft is rotatably installed at the opening opened on the side wall of the screening frame, and a cam is fixedly connected to the surface of the support shaft. A contact block is welded to one end of the main coal hopper close to the support shaft, and the contact block is in contact with the cam. A third motor is fixedly installed on the outer surface of the screening frame corresponding to the support shaft, and a transmission belt is wound between the output end of the third motor and the support shaft. Side openings are provided on the left and right sides of the lower part of the screening square cylinder, and two auxiliary coal hoppers are welded to the corresponding side openings in the screening frame, and one end of the two auxiliary coal hoppers extends to the outside of the screening frame.

[0008] As a further description of the above technical solution: a bell mouth is provided on the top of the screening square drum, and two material discharge inclined plates are symmetrically welded below the bell mouth, and the two material discharge inclined plates are respectively located above the two square rollers.

[0009] As a further description of the above technical solution: the upper part of the auxiliary coal hopper is welded with a guide plate obliquely through a support rod, and the higher end of the guide plate corresponds to the side opening, and the lower end of the guide plate corresponds to the auxiliary coal hopper.

[0010] As a further description of the above technical solution: the part of the main coal hopper extending out of the screening square cylinder is welded with a side ear, and the side wall of the screening frame is welded with a T-shaped rod corresponding to the side ear, and the surface of the T-shaped rod is provided with a spring, the side ear is connected to the T-shaped rod, and the side ear and the spring on the surface of the T-shaped rod are against each other.

[0011] As a further description of the above technical solution: the main coal hopper and the auxiliary coal hopper are both inclined relative to the screening frame, and the cross-sections of the main coal hopper and the auxiliary coal hopper are both U-shaped structures.

[0012] As a further description of the above technical solution: one of the square rollers of the screening square drum rotates clockwise, and the other square roller of the screening square drum rotates counterclockwise.

[0013] The utility model has the following beneficial effects:

[0014] The utility model discloses that by starting the two second motors of the screening square drum, the two square rollers rotate respectively. Since the right-angle ends of the two square rollers are welded with a plurality of stripping columns, and the stripping columns of the two square rollers are staggered, the impurities or larger coal lumps mixed in the falling coal powder are respectively guided to the corresponding side openings by the two square rollers, and are transferred to the auxiliary coal hopper and discharged from the screening square drum under the action of the guide plate. By starting the third motor, the transmission belt drives the support shaft and the cam on its surface to rotate. Since the main coal hopper is abutted against the cam through the contact block, and the side ears on both sides of the main coal hopper are socketed with the T-bar with a spring, the main coal hopper makes a reciprocating motion. Combined with the setting of the screen, the coarse coal powder and the fine coal powder are screened. Compared with the prior art, a screening frame with a conveyor belt and a screening square drum is adopted, so that impurities or larger coal lumps, coarse coal powder and fine coal powder can be respectively discharged from the auxiliary coal hopper, the main coal hopper and the conveyor belt, thereby achieving the effect of online and fast screening of coal powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of a screening device for coal powder according to the present utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of a screening frame of a screening device for coal powder according to the present invention;

[0017] Figure 3 The utility model is a schematic diagram of the screening frame and main coal hopper structure of a screening device for coal powder.

[0018] Legend:

[0019] 1. Screening frame; 2. Conveyor belt; 3. First motor; 4. Screening drum; 5. Second motor; 6. Third motor; 7. Square roller; 8. Main coal hopper; 9. Auxiliary coal hopper; 10. Guide plate; 11. Unloading inclined plate; 12. Material shifting column; 13. Side opening; 14. Contact block; 15. Screen; 16. Support shaft; 17. Cam; 18. Drive belt; 19. T-bar; 20. Side ear; 21. Spring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] According to an embodiment of the present invention, a screening device for coal powder is provided.

[0022] The present invention will now be further described with reference to the accompanying drawings and specific embodiments. Figure 1-3 As shown, a coal screening device according to an embodiment of the present invention includes a screening frame 1, the inner side of the screening frame 1 is connected to a conveyor belt 2 by two transmission rollers, and a first motor 3 is installed on one of the transmission rollers of the screening frame 1 through a coupling, a screening square drum 4 is provided above the conveyor belt 2, and the lower part of the screening square drum 4 is welded to the inner wall of the screening frame 1, two second motors 5 are fixedly installed on the upper surface of the screening square drum 4, and the output ends of the two second motors 5 respectively pass through the screening square drum 4 and are fixedly connected to square rollers 7, each right-angle end of the two square rollers 7 is welded with a plurality of material-dispensing columns 12, and the material-dispensing columns 12 of the two square rollers 7 are staggered, a main coal hopper 8 is provided below the square roller 7, and the main coal hopper 8 with an opening at one end extends to the outside of the screening square drum 4, and a screen 15 is welded on the bottom surface of the main coal hopper 8, and the opening on the side wall of the screening frame 1 is turned to rotate A support shaft 16 is dynamically installed, and a cam 17 is fixed to the surface of the support shaft 16. A contact block 14 is welded to one end of the main coal hopper 8 close to the support shaft 16, and the contact block 14 is in abutment with the cam 17. A third motor 6 is fixedly installed on the outer surface of the screening frame 1 corresponding to the support shaft 16, and a transmission belt 18 is wound between the output end of the third motor 6 and the support shaft 16. Side openings 13 are provided on both sides of the lower part of the screening square cylinder 4. Two auxiliary coal hoppers 9 are welded to the corresponding side openings 13 in the screening frame 1, and one end of the two auxiliary coal hoppers 9 extends to the outside of the screening frame 1. For all motors involved in this device, the control method of the present utility model is to control by manually starting and shutting down the switch. The wiring diagram of the power component and the provision of power supply are common knowledge in this field, and the present utility model is mainly used to protect the mechanical device, so the control method and wiring arrangement are no longer explained in detail in this utility model.

[0023] In one embodiment, a bell mouth is provided on the top of the screening square cylinder 4, and two discharge inclined plates 11 are symmetrically welded below the bell mouth. The two discharge inclined plates 11 are respectively located above the two square rollers 7. Through the setting of the two discharge inclined plates 11, the coal powder can be concentrated in the gap between the two square rollers 7 to increase the primary screening effect.

[0024] In one embodiment, the upper part of the auxiliary coal hopper 9 is welded with a guide plate 10 at an angle through a support rod, and the higher end of the guide plate 10 corresponds to the side opening 13, and the lower end of the guide plate 10 corresponds to the auxiliary coal hopper 9. Through the setting of the side opening 13 and the guide plate 10, debris or larger coal in the coal powder can be transferred to the auxiliary coal hopper 9 for discharge.

[0025] In one embodiment, a side ear 20 is welded to the portion of the main coal hopper 8 extending out of the screening square cylinder 4, and a T-shaped rod 19 is welded to the side wall surface of the screening frame 1 corresponding to the side ear 20, and a spring 21 is sleeved on the surface of the T-shaped rod 19. The side ear 20 is nested with the T-shaped rod 19, and the side ear 20 is against the spring 21 on the surface of the T-shaped rod 19. Since the main coal hopper 8 is against the cam 17 through the contact block 14, and the side ears 20 on both sides of the main coal hopper 8 are nested with the T-shaped rod 19 with the spring 21, the contact block 14 of the main coal hopper 8 is forced to always maintain abutment with the cam 17, which facilitates the reciprocating motion of the main coal hopper 8, thereby achieving the purpose of coal powder screening.

[0026] In one embodiment, the main coal hopper 8 and the auxiliary coal hopper 9 are both inclined relative to the screening frame 1, and the cross-sections of the main coal hopper 8 and the auxiliary coal hopper 9 are both U-shaped structures. Through the arrangement of the main coal hopper 8 and the auxiliary coal hopper 9, it is easy to discharge materials separately in the screening stage. In order to avoid secondary mixing of materials in the main coal hopper 8 and the auxiliary coal hopper 9, the length of the main coal hopper 8 is greater than that of the auxiliary coal hopper 9.

[0027] In one embodiment, one of the square rollers 7 of the screening square drum 4 rotates clockwise, and the other square roller 7 of the screening square drum 4 rotates counterclockwise. With this transmission method, the two screening square drums 4 can continuously remove debris or larger coal blocks in the falling coal powder and transfer them to the auxiliary coal hopper 9 for discharge.

[0028] Working principle:

[0029] When in use, first, the coal powder to be screened is rotated by the two second motors 5 of the screening square drum 4. Since the right-angled ends of the two square rollers 7 are welded with a plurality of material-dispensing columns 12, and the material-dispensing columns 12 of the two square rollers 7 are staggered, the impurities or large coal blocks mixed in the falling coal powder are guided to the corresponding side openings 13 by the two square rollers 7 respectively, and are transferred to the auxiliary coal hopper 9 under the action of the guide plate 10 to be discharged from the screening square drum 4. The coal powder screened by the square rollers 7 enters the main coal hopper 8. By starting the third motor 6, the transmission belt 18 drives the support shaft 16 and the cam 17 on its surface to rotate. Since the main coal hopper 8 is in contact with the cam 17 through the contact block 14, and the side ears 20 on both sides of the main coal hopper 8 are connected with the T-shaped rod 19 with a spring 21, the contact block 14 of the main coal hopper 8 is forced to always maintain an abutment state with the cam 17, causing the main coal hopper 8 to perform reciprocating motion. Combined with the setting of the screen 15, coarse coal powder is discharged from the opening at the rear end of the main coal hopper 8, and fine coal powder passes through the screen 15 and is discharged through the conveyor belt 2.

[0030] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A screening device for coal powder, comprising a screening frame (1), characterized in that: The inner side of the screening frame (1) is connected to a conveyor belt (2) through two transmission rollers, and a first motor (3) is installed on one of the transmission rollers of the screening frame (1) through a coupling. A screening square drum (4) is arranged above the conveyor belt (2), and the lower part of the screening square drum (4) is welded to the inner wall of the screening frame (1). Two second motors (5) are fixedly installed on the upper surface of the screening square drum (4), and the output ends of the two second motors (5) respectively pass through the screening square drum (4) and are fixedly connected to square rollers (7). Each right-angle end of the two square rollers (7) is welded with a plurality of material-dispensing columns (12), and the material-dispensing columns (12) of the two square rollers (7) are staggered. A main coal hopper (8) is arranged below the square roller (7), and the main coal hopper (8) has an opening at one end extending to the outside of the screening square drum (4). , and a screen (15) is welded to the bottom surface of the main coal hopper (8), a support shaft (16) is rotatably installed at the opening opened on the side wall of the screening frame (1), and a cam (17) is fixedly connected to the surface of the support shaft (16), a contact block (14) is welded to one end of the main coal hopper (8) close to the support shaft (16), and the contact block (14) and the cam (17) are in contact with each other, a third motor (6) is fixedly installed on the outer surface of the screening frame (1) corresponding to the support shaft (16), and a transmission belt (18) is wound and installed between the output end of the third motor (6) and the support shaft (16), side openings (13) are opened on both sides of the lower part of the screening square cylinder (4), two auxiliary coal hoppers (9) are welded to the corresponding side openings (13) in the screening frame (1), and one end of the two auxiliary coal hoppers (9) extends to the outside of the screening frame (1).

2. The screening device for coal powder according to claim 1, characterized in that: The top of the screening square cylinder (4) is provided with a bell mouth, and two material discharge inclined plates (11) are symmetrically welded below the bell mouth, and the two material discharge inclined plates (11) are respectively located above the two square rollers (7).

3. The screening device for coal powder according to claim 1, characterized in that: The upper portion of the auxiliary coal hopper (9) is obliquely welded with a guide plate (10) via a support rod, and the higher end of the guide plate (10) corresponds to the side opening (13), and the lower end of the guide plate (10) corresponds to the auxiliary coal hopper (9).

4. The screening device for coal powder according to claim 1, characterized in that: A side ear (20) is welded to the portion of the main coal hopper (8) extending out of the screening square cylinder (4); a T-shaped rod (19) is welded to the side wall of the screening frame (1) corresponding to the side ear (20); and a spring (21) is sleeved on the surface of the T-shaped rod (19); the side ear (20) is sleeved on the T-shaped rod (19), and the side ear (20) and the spring (21) on the surface of the T-shaped rod (19) are abutted.

5. The screening device for coal powder according to claim 1, characterized in that: The main coal hopper (8) and the auxiliary coal hopper (9) are both arranged obliquely with respect to the screening frame (1), and the cross sections of the main coal hopper (8) and the auxiliary coal hopper (9) are both U-shaped structures.

6. The screening device for coal powder according to claim 1, characterized in that: One of the square rollers (7) of the screening square drum (4) rotates clockwise, and the other square roller (7) of the screening square drum (4) rotates counterclockwise.

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