Preparation method of dedusting ash cold-pressed pellets

Abstract

The invention relates to the technical field of smelting, and discloses a dedusting ash cold-pressed pellet preparation method which comprises the following steps: S1, raw material preparation: firstly preparing required converter dedusting ash or gas ash, putting the raw materials into a raw material bin for use after the raw materials are prepared, and in order to ensure the iron element in the pellet and the stability of the pellet, preparing a raw material bin; wherein the fly ash or the gas ash with the total iron content of 55% is used. The fly ash anti-calcium oxide pellet adhesive has the advantages that after the fly ash anti-calcium oxide pellet adhesive and materials are stirred with water, high adhesion can be generated, a good adhesion effect is achieved, the pellet forming rate, the wet pellet anti-falling performance and the dry pellet compressive strength are improved, and secondly, the fly ash anti-calcium oxide pellet adhesive can be recycled. The fly ash anti-calcium oxide pellet adhesive can also inhibit the pellets from disintegration and pulverization in the drying or placing process, so that the cold strength of the pellets is improved, finally, the forming rate of the pellets is high, the fly ash pellets replace scrap steel to be put into a converter and used as a cooling agent, the reaction temperature in the converter can be reduced, and the whole steelmaking process is more stable.

Description

Technical Field

[0001] The invention relates to the technical field of smelting, and in particular to a method for preparing dust ash cold-pressed pellets. Background Art

[0002] In recent years, the soaring price of imported iron ore has directly led to a substantial increase in my country's iron ore import costs, which in turn has caused domestic iron ore prices and energy prices. The iron content in converter dust is relatively high, TFe>50%, which is a high-quality iron-containing resource. If it is not utilized, it will not only cause a waste of resources, but also occupy a large amount of land for its stacking, and may also cause environmental pollution. Cold-pressed pellets refer to mixing powdered or small-particle iron concentrate with appropriate binders, and adding them to corresponding equipment to form block materials with a certain shape, size, density and strength after being compressed under a certain external pressure.

[0003] However, the existing method for preparing dust ash cold-pressed pellets has the problem of high pelletization rate. Summary of the invention

[0004] The purpose of the present invention is to provide a method for preparing dust ash cold-pressed pellets, which can solve the problems raised in the above-mentioned background technology.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: a method for preparing dust ash cold-pressed pellets, comprising a feeder, a dust ash digestion bin, a mesh belt dryer, a mixer and a pellet press, one side of the feeder is fixedly connected with a connecting plate, one side of the connecting plate is fixedly connected with a support frame, the upper surface of the support frame is fixedly connected with a fixing plate, one side of the mixer is provided with a notch, the inside of the notch is fixedly connected with a conveyor belt, the lower surface of the conveyor belt is fixedly connected with a support plate, the lower surface of the support plate is fixedly connected with a rectangular plate, both sides of the conveyor belt are fixedly connected with L-shaped plates, the upper surface of the L-shaped plate is fixedly connected with a connecting piece, and one side of the connecting piece is fixedly connected with a baffle.

[0006] By adopting the above technical scheme, converter dust / gas ash (total iron content 55%) → one of the feeders → adding water to the mixer (the amount of water is 8% of the dust ash) → the dust ash digestion bin is digested for more than 24 hours → the arch breaking device on the dust ash digestion bin is broken → the dust ash antioxidant calcium pellet binder (the amount added is 3-5% of the dust ash) is evenly sprayed on the conveyor belt → the material is evenly stirred by the mixer (stirring time is about 2 minutes) → spraying an appropriate amount of water on the second mixer (the amount of water is 8%-10% of the dust ash) → stirring evenly by the second mixer (stirring time is about 2 minutes), and then pressed by the ball press → wet dust ash pellets → drying in a drying furnace (drying temperature 150°C and Drying time 2h) → dry dust ash pellets (water content less than 1%), dust ash antioxidant calcium pellet binder and materials can generate high bonding force after adding water and stirring, and achieve good bonding effect, which not only improves the pellet forming rate, wet ball anti-fall performance and dry ball compressive strength, but also inhibits the disintegration and pulverization of the pellets during drying or placement, thereby improving the cold strength of the pellets, and ultimately making the pellet forming rate high, and making the pellets uniform in particle size, the wet ball 2m falling intact, the drying strength can reach more than 100kg, the pellet pulverization rate is reduced, and the dust ash pellets replace scrap steel to be put into the converter and used as a cooling agent, which can reduce the reaction temperature in the furnace and make the entire steelmaking process more stable.

[0007] The present invention is further configured as follows: one side of the fixing plate is fixedly connected to the surface of the mixer, and the lower surface of the rectangular plate is fixedly connected to the upper surface of the supporting frame.

[0008] By adopting the above technical solution, the fixing plate plays the role of connecting the mixer and the supporting frame together.

[0009] The present invention is further configured as follows: the lower surfaces of the feeder and the support frame are both fixedly connected with a Forma wheel, and the interior of the support frame is fixedly connected with a cross bar.

[0010] By adopting the above technical solution, the setting of the Fomar wheel can facilitate the transportation of the equipment.

[0011] The present invention is further configured as follows: the number of the Foma wheels is four, and the four Foma wheels are fixedly connected to the lower surface of the feeder and the support frame in the form of a rectangular array.

[0012] By adopting the above technical solution, the arrangement of four Forma wheels makes the stability stronger.

[0013] The present invention is further configured as follows: an arc-shaped groove is provided on the upper surface of the fixing plate, and a bolt is inserted into the interior of the arc-shaped groove.

[0014] By adopting the above technical solution, the provision of the bolts plays a role in fixing and limiting the fixing plate.

[0015] The present invention is further configured as follows: a bracket is fixedly connected to one side of the mesh belt dryer, and a bearing seat is fixedly connected to the inside of the bracket.

[0016] By adopting the above technical solution, the setting of the bracket plays a role in fixing the bearing seat.

[0017] The present invention is further configured as follows: a rotating shaft is fixedly connected to the interior of the bearing seat, and a motor is fixedly connected to one end of the rotating shaft.

[0018] By adopting the above technical solution, the setting of the motor can drive the rotating shaft to rotate.

[0019] The present invention is further configured as follows: a support plate is fixedly connected to the lower surface of the motor, and one side of the support plate is fixedly connected to the bracket.

[0020] By adopting the above technical solution, the support plate is provided to support and fix the motor.

[0021] The present invention is further configured as follows: a rotating roller is fixedly connected to the outside of the rotating shaft, and a belt is provided on the surface of the rotating roller.

[0022] By adopting the above technical solution, the rotation of the output end of the motor can drive the rotating shaft and the rotating roller to rotate, thereby driving the belt to transport the material.

[0023] The present invention is further provided as follows: a method for preparing dust ash cold-pressed pellets, characterized in that it comprises the following steps:

[0024] S1: Raw material preparation. First, prepare the required converter dust ash or gas ash. After the raw materials are prepared, they are put into the raw material warehouse and wait for use. In order to ensure the iron element in the pellets and the stability of the pellets, the dust ash or gas ash with a total iron content of 55% is selected for use.

[0025] S2: Raw material transportation, the raw materials in the raw material bin are transported by a star feeder;

[0026] S3: Raw materials are mixed and stirred. The star feeder conveys the raw materials to the mixer for water addition and stirring. After the stirring is completed, the raw materials are conveyed to the next process for processing through the conveying device;

[0027] S4: Digestion and crushing. The raw materials are stirred with water and then transported to the dust ash digestion bin for digestion for more than 24 hours. Since the ingredients in the raw materials are relatively complex, such as iron oxide, calcium oxide, silicon oxide, etc., in order to achieve the ideal digestion effect, it is necessary to ensure that the digestion time is more than 24 hours. After the digestion is completed, the arch breaking device on the dust ash digestion bin is used for crushing;

[0028] S5: stirring and mixing, the crushed raw materials are transported through a conveyor belt, and the dust removal ash antioxidant calcium pellet binder is evenly sprayed on the conveyor belt during transportation. After the dust removal ash antioxidant calcium pellet binder is added, it is stirred evenly by a mixer;

[0029] S6: stirring and mixing again, adding the dust ash antioxidant calcium pellet binder raw materials into the second mixer and spraying an appropriate amount of water for stirring, the stirring time is 2 minutes, the dust ash antioxidant calcium pellet binder and the material can generate high bonding force after adding water and stirring, and achieve good bonding effect, which not only improves the pellet forming rate, wet ball anti-fall performance and dry ball compressive strength, but also the dust ash antioxidant calcium pellet binder can also inhibit the disintegration and pulverization of the pellets during drying or placement, thereby improving the cold strength of the pellets, making it difficult to break during use, improving the smelting recovery rate, and thus optimizing the pellet performance, making it difficult to break during use, improving the smelting recovery rate, and thus optimizing the pellet performance;

[0030] S7: preparing pellets, after the stirring is completed, pressing the pellets through a pellet press to prepare wet dust ash pellets;

[0031] S8: Drying: Drying the wet dust ash pellets at a temperature of 150° C. for 2 hours. After drying, a finished product is obtained, and the moisture content of the dust ash cold-pressed pellets of the finished product is below 1%.

[0032] The beneficial effects of the present invention are as follows: converter dust / gas ash (total iron content 55%) → one of the feeders → adding water to the mixer for stirring (the amount of water is 8% of the dust ash) → the dust ash is digested in the digestion bin for more than 24 hours → the arch breaking device on the dust ash digestion bin is broken → the dust ash antioxidant calcium pellet binder (the amount added is 3-5% of the dust ash) is evenly sprayed on the conveyor belt → the material is evenly stirred by the mixer (stirring time is about 2 minutes) → an appropriate amount of water (the amount of water is 8%-10% of the dust ash) is sprayed on the second mixer → the material is evenly stirred by the second mixer (stirring time is about 2 minutes), and then the pellets are pressed by the pellet press → wet dust ash pellets → drying in a drying furnace (drying temperature is 150°C and Drying time 2h) → dry dust ash pellets (water content less than 1%), dust ash antioxidant calcium pellet binder and materials can generate high bonding force after adding water and stirring, and achieve good bonding effect, which not only improves the pellet forming rate, wet ball anti-fall performance and dry ball compressive strength, but also inhibits the disintegration and pulverization of the pellets during drying or placement, thereby improving the cold strength of the pellets, and ultimately making the pellet forming rate high, and making the pellets uniform in particle size, the wet ball 2m falling intact, the drying strength can reach more than 100kg, the pellet pulverization rate is reduced, and the dust ash pellets replace scrap steel to be put into the converter and used as a cooling agent, which can reduce the reaction temperature in the furnace and make the entire steelmaking process more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is a structural schematic diagram of the present invention;

[0035] Figure 2 It is a front view structural schematic diagram of the dust removal ash digestion bin of the present invention;

[0036] Figure 3 It is a structural schematic diagram of the support frame of the present invention;

[0037] Figure 4 This is a schematic diagram of the structure of the dust removal ash digestion bin of the present invention;

[0038] Figure 5 For the present invention Figure 1 The enlarged structural diagram at A in the middle;

[0039] Figure 6 For the present invention Figure 3 Enlarged structural diagram at B in the middle.

[0040] In the figure, 1. feeder; 2. dust removal ash digestion bin; 3. mesh belt dryer; 4. mixer; 5. ball press; 6. support frame; 7. fixing plate; 8. notch; 9. conveyor belt; 10. support plate; 11. rectangular plate; 12. L-shaped plate; 13. connecting piece; 14. baffle; 15. Fuma wheel; 16. bracket; 17. bearing seat; 18. belt; 19. connecting plate; 20. cross bar. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Reference Figure 1-6A method for preparing dust ash cold-pressed pellets, comprising a feeder 1, a dust ash digestion bin 2, a mesh belt dryer 3, a mixer 4 and a pellet press 5, one side of the mesh belt dryer 3 is fixedly connected with a bracket 16, the inside of the bracket 16 is fixedly connected with a bearing seat 17, the inside of the bearing seat 17 is fixedly connected with a rotating shaft, one end of the rotating shaft is fixedly connected with a motor, the lower surface of the motor is fixedly connected with a support plate, one side of the support plate is fixedly connected to the bracket 16, the outside of the rotating shaft is fixedly connected with a rotating roller, the surface of the rotating roller is provided with a belt 18, the lower surfaces of the feeder 1 and the support frame 6 are fixedly connected with a Forma wheel 15, the number of the Forma wheels 15 is four, and the four Forma wheels 15 are fixedly connected to the feeder 1 and the support frame 6 in the form of a rectangular array. On the lower surface, the interior of the support frame 6 is fixedly connected with a cross bar 20, one side of the feeder 1 is fixedly connected with a connecting plate 19, and one side of the connecting plate 19 is fixedly connected with the support frame 6, converter dust / gas ash (total iron content 55%) → one of the feeders 1 → add water and stir in the mixer 4 (the amount of water is 8% of the dust ash) → the dust ash digestion bin 2 is digested for more than 24 hours → the arch breaking device on the dust ash digestion bin 2 is broken → the dust ash antioxidant calcium pellet binder (the amount of dust ash) is evenly sprayed on the conveyor belt 9 → the material is evenly stirred by the mixer 4 (stirring time is about 2 minutes) → spray an appropriate amount of water on the second mixer 4 (the amount of water is 8% to 10% of the dust ash) → stir evenly through the second mixer 4 (stirring The time is about 2min), and then the pellets are pressed by the pellet press machine 5 → wet dust ash pellets → drying in a drying furnace (drying temperature 150℃ and drying time 2h) → dry dust ash pellets (water content less than 1%). The dust ash antioxidant calcium pellet binder can produce high bonding force and achieve good bonding effect after stirring with the material with water, which not only improves the pellet forming rate, wet ball anti-fall performance and dry ball compressive strength. Secondly, the dust ash antioxidant calcium pellet binder can also inhibit the disintegration and pulverization of the pellets during the drying or placement process, thereby improving the cold strength of the pellets, and finally making the pellet forming rate high, and making the pellet size uniform, the wet ball 2m falling intact, the drying strength can reach more than 100kg, the pellet pulverization rate is reduced, and the dust ash pellets replace scrap steel to be put into the converter. , used as a cooling agent, can reduce the reaction temperature in the furnace, making the entire steelmaking process more stable, the upper surface of the support frame 6 is fixedly connected with a fixing plate 7, one side of the fixing plate 7 is fixedly connected to the surface of the mixer 4, the lower surface of the rectangular plate 11 is fixedly connected to the upper surface of the support frame 6, one side of the mixer 4 is provided with a notch 8, the inside of the notch 8 is fixedly connected with a conveyor belt 9, the lower surface of the conveyor belt 9 is fixedly connected with a support plate 10, the lower surface of the support plate 10 is fixedly connected with a rectangular plate 11, the upper surface of the fixing plate 7 is provided with an arc groove, the inside of the arc groove is plugged with bolts, both sides of the conveyor belt 9 are fixedly connected with L-shaped plates 12, the upper surface of the L-shaped plate 12 is fixedly connected with a connector 13, and one side of the connector 13 is fixedly connected with a baffle 14;

[0043] A method for preparing dust ash cold-pressed pellets, characterized in that it comprises the following steps:

[0044] S1: Raw material preparation. First, prepare the required converter dust ash or gas ash. After the raw materials are prepared, they are put into the raw material warehouse and wait for use. In order to ensure the iron element in the pellets and the stability of the pellets, the dust ash or gas ash with a total iron content of 55% is selected for use.

[0045] S2: Raw material transportation, the raw materials in the raw material bin are transported by a star feeder;

[0046] S3: The raw materials are mixed and stirred. The star feeder conveys the raw materials to the mixer 4 for adding water and stirring. After the stirring is completed, the raw materials are conveyed to the next process for processing by the conveying device;

[0047] S4: digestion and crushing. The raw materials are stirred with water and then transported to the dust removal ash digestion bin 2 for digestion for more than 24 hours. Since the ingredients in the raw materials are relatively complex, such as iron oxide, calcium oxide, silicon oxide, etc., in order to achieve an ideal digestion effect, it is necessary to ensure that the digestion time is more than 24 hours. After the digestion is completed, the arch breaking device on the dust removal ash digestion bin 2 is used for crushing;

[0048] S5: stirring and mixing, the crushed raw materials are transported through the conveyor belt 9, and the dust removal ash antioxidant calcium pellet binder is evenly sprayed on the conveyor belt 9 during transportation. After the dust removal ash antioxidant calcium pellet binder is added, it is stirred evenly by the mixer 4;

[0049] S6: stirring and mixing again, adding the dust ash antioxidant calcium pellet binder raw materials into the second mixer 4 and spraying an appropriate amount of water for stirring, the stirring time is 2 minutes, the dust ash antioxidant calcium pellet binder and the material can generate high bonding force after adding water and stirring, and achieve good bonding effect, which not only improves the pellet forming rate, wet ball anti-fall performance and dry ball compressive strength, but also the dust ash antioxidant calcium pellet binder can also inhibit the disintegration and pulverization of the pellets during drying or placement, thereby improving the cold strength of the pellets, making it difficult to break during use, improving the smelting recovery rate, and thus optimizing the pellet performance, making it difficult to break during use, improving the smelting recovery rate, and thus optimizing the pellet performance;

[0050] S7: preparing pellets. After the stirring is completed, the pellets are pressed by a pellet press 5 to prepare wet dust ash pellets;

[0051] S8: Drying: Drying the wet dust ash pellets at a temperature of 150° C. for 2 hours. After drying, a finished product is obtained, and the moisture content of the dust ash cold-pressed pellets of the finished product is below 1%.

[0052] Furthermore, the amount of water added in step S3 is 8% of the raw material, the amount of dust ash antioxidant calcium pellet binder added in step S5 is 3-5% of the raw material, and the amount of water sprayed in step S6 is 8-10% of the raw material.

[0053] In the present invention, converter dust / gas ash (total iron content 55%) → one of the feeders 1 → adding water to the mixer 4 for stirring (the amount of water is 8% of the dust ash) → the dust ash digestion bin 2 is digested for more than 24 hours → the arch breaking device on the dust ash digestion bin 2 is broken → the dust ash antioxidant calcium pellet binder (the amount added is 3-5% of the dust ash) is evenly sprayed on the conveyor belt 9 → the material is evenly stirred by the mixer 4 (stirring time is about 2 minutes) → an appropriate amount of water (the amount of water is 8%-10% of the dust ash) is sprayed on the second mixer 4 → the material is evenly stirred by the second mixer 4 (stirring time is about 2 minutes), and then the pellets are pressed by the pellet press 5 → the wet dust ash pellets are dried in the drying furnace (drying temperature 150 ℃ and drying time 2h) → dry dust ash pellets (water content less than 1%), dust ash antioxidant calcium pellet binder and materials can generate high bonding force after adding water and stirring, and achieve good bonding effect, which not only improves the pellet forming rate, wet ball anti-fall performance and dry ball compressive strength, but also inhibits the disintegration and pulverization of the pellets during drying or placement, thereby improving the cold strength of the pellets, and ultimately making the pellet forming rate high, and making the pellets uniform in particle size, the wet ball 2m falling intact, the drying strength can reach more than 100kg, the pellet pulverization rate is reduced, and the dust ash pellets replace scrap steel to be put into the converter and used as a cooling agent, which can reduce the reaction temperature in the furnace and make the entire steelmaking process more stable.

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing dust ash cold pressed pellets, comprising the following steps: S1: Raw material preparation. First, prepare the required converter dust ash or gas ash. After the raw materials are prepared, they are put into the raw material warehouse and wait for use. In order to ensure the iron element in the pellets and the stability of the pellets, the dust ash or gas ash with a total iron content of 55% is selected for use. S2: Raw material transportation, the raw materials in the raw material bin are transported by a star feeder; S3: Mixing and stirring the raw materials. The star feeder conveys the raw materials to the mixer (4) for adding water and stirring. After the stirring is completed, the raw materials are conveyed to the next process for processing by the conveying device; S4: digestion and crushing. The raw materials are stirred with water and then transported to the dust ash digestion bin (2) for digestion for more than 24 hours. Since the components in the raw materials are relatively complex, such as iron oxide, calcium oxide, silicon oxide, etc., in order to achieve an ideal digestion effect, it is necessary to ensure that the digestion time is more than 24 hours. After the digestion is completed, the dust ash digestion bin (2) is crushed using the arch breaking device; S5: stirring and mixing, the crushed raw materials are transported through a conveyor belt (9), and during transportation, the dust removal ash antioxidant calcium pellet binder is evenly sprayed on the conveyor belt (9), and after the dust removal ash antioxidant calcium pellet binder is added, it is stirred evenly by a mixer (4); S6: stirring and mixing again, adding the dust ash antioxidant calcium pellet binder raw materials into the second mixer (4) and spraying an appropriate amount of water for stirring, the stirring time is 2 minutes, the dust ash antioxidant calcium pellet binder and the material can generate high bonding force after adding water and stirring, and achieve good bonding effect, which not only improves the pellet forming rate, wet ball anti-fall performance and dry ball compressive strength, but also the dust ash antioxidant calcium pellet binder can also inhibit the disintegration and pulverization of the pellets during drying or placement, thereby improving the cold strength of the pellets, making them not easy to break during use, improving the smelting recovery rate, and optimizing the pellet performance; S7: preparing pellets, after the stirring is completed, using a pellet press (5) to press the pellets to prepare wet dust ash pellets; S8: Drying: Drying the wet dust ash pellets at a temperature of 150° C. for 2 hours. After drying, a finished product is obtained, and the moisture content of the dust ash cold-pressed pellets of the finished product is below 1%.

2. The method for preparing dust ash cold-pressed pellets according to claim 1, characterized in that: The amount of water added in step S3 is 8% of the raw material.

3. The method for preparing dust ash cold-pressed pellets according to claim 1, characterized in that: In the step S5, the amount of dust ash antioxidant calcium pellet binder added is 3-5% of the raw material.

4. The method for preparing dust ash cold-pressed pellets according to claim 1, characterized in that: The amount of water sprayed in step S6 is 8-10% of the raw material.

5. The method for preparing dust ash cold-pressed pellets according to any one of claims 1 to 4, characterized in that: The invention also comprises a feeder (1), a dust removal ash digestion bin (2), a mesh belt dryer (3), a mixer (4) and a ball press (5), wherein one side of the feeder (1) is fixedly connected to a connecting plate (19), one side of the connecting plate (19) is fixedly connected to a support frame (6), the upper surface of the support frame (6) is fixedly connected to a fixing plate (7), one side of the mixer (4) is provided with a notch (8), the interior of the notch (8) is fixedly connected to a conveyor belt (9), and the The lower surface of the conveyor belt (9) is fixedly connected to a support plate (10), the lower surface of the support plate (10) is fixedly connected to a rectangular plate (11), both sides of the conveyor belt (9) are fixedly connected to L-shaped plates (12), the upper surface of the L-shaped plate (12) is fixedly connected to a connecting piece (13), one side of the connecting piece (13) is fixedly connected to a baffle (14), one side of the fixing plate (7) is fixedly connected to the surface of the mixer (4), and the lower surface of the rectangular plate (11) is fixedly connected to the surface of the mixer (4). The surface is fixedly connected to the upper surface of the support frame (6), the lower surfaces of the feeder (1) and the support frame (6) are fixedly connected with a Forma wheel (15), the interior of the support frame (6) is fixedly connected with a cross bar (20), the number of the Forma wheels (15) is four, and the four Forma wheels (15) are fixedly connected to the lower surfaces of the feeder (1) and the support frame (6) in the form of a rectangular array, the upper surface of the fixing plate (7) is provided with an arc groove, the interior of the arc groove is plugged with bolts, one side of the mesh belt dryer (3) is fixedly connected with a bracket (16), the interior of the bracket (16) is fixedly connected with a bearing seat (17), the interior of the bearing seat (17) is fixedly connected with a rotating shaft, one end of the rotating shaft is fixedly connected with a motor, the lower surface of the motor is fixedly connected with a support plate, one side of the support plate is fixedly connected with the bracket (16), the outside of the rotating shaft is fixedly connected with a rotating roller, and the surface of the rotating roller is provided with a belt (18).

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