A screw conveyor and a dryer discharge system incorporating the screw conveyor with grading and crushing functions.

Abstract

This application discloses a screw conveyor and a dryer discharge system with grading and crushing functions. The screw conveyor includes a cylinder, a shaft, screw blades a and b, a motor, and a separation pipe and a feeding pipe perpendicular to the cylinder. A feed inlet is located at the left end of the cylinder. The feeding pipe and separation pipe are located at the top and bottom of the cylinder, respectively, and their air passages are connected. An air chamber is located on the outside of the separation pipe. A smooth shaft is located in the middle of the shaft, corresponding to the junction of the separation pipe and the feeding pipe. Screw blades a are located at the left end and b at the right end, with the two screw blades rotating in opposite directions. Material enters the cylinder through the feed inlet and falls into the separation pipe under the action of screw blades a. Smaller particles are carried by the airflow and flow out through the upper air outlet a via the feeding pipe for gas-solid separation. Larger particles and lumps are directly crushed. The screw conveyor and discharge system of this application can grade, convey, and crush dried products, reducing the transportation and crushing processes of lumps, saving manpower, and being environmentally friendly.

Description

Technical Field

[0001] This invention belongs to the field of drying equipment technology, specifically relating to a screw conveyor and a dryer discharge system with grading and crushing functions. The dryer discharge system of this application has a simple structure, a friendly working environment, saves manpower, and has grading and crushing functions. Background Technology

[0002] During the continuous drying process, a certain amount of lumps will inevitably form. These lumps are considered unqualified products and must be separated and crushed.

[0003] Typically, materials are discharged directly after drying and screened to obtain qualified products. Lump materials are transported to other equipment for centralized crushing and screening, which is a complex process. If it is an open operation, there will be a lot of dust and great hazards.

[0004] To enable timely crushing of lumps, reduce crushing steps, and minimize inter-step transportation, a screw conveyor and dryer discharge system with grading and crushing functions is proposed. An air classifier is connected to the discharge port, sending small-sized materials to a baghouse dust collector for gas-solid separation to obtain the final product. Simultaneously, larger particles and lumps are directly fed into the crusher for further crushing. The crushed material is then transported back to the baghouse dust collector for gas-solid separation to obtain the final product. This eliminates the need for a separate crushing process, reducing manpower and space requirements. Summary of the Invention

[0005] In view of the above-mentioned problems in the existing technology, the purpose of the present invention is to provide a screw conveyor and a dryer discharge system that also has a grading and crushing function.

[0006] The technical solution adopted in this invention is as follows:

[0007] The spiral discharge machine is characterized by comprising a concentrically mounted cylinder, a shaft, spiral blades a and b, and a motor for driving the shaft to rotate within the cylinder, as well as a separation pipe and a feeding pipe perpendicular to the cylinder. The cylinder has a feed inlet at its left end. The feeding pipe and separation pipe are respectively located at the upper and lower ends of the cylinder's center and are connected by air passages. A wind chamber is provided on the outer side of the separation pipe. The shaft is configured as a smooth rod at the junction of the separation pipe and the feeding pipe, with spiral blade a at its left end and spiral blade b at its right end. Material enters the cylinder through the feed inlet and falls into the upper opening of the separation pipe under the action of spiral blade a. Under the upward airflow, small-sized material is carried by the airflow and flows out through the upper outlet a of the feeding pipe for gas-solid separation processing. Large-sized material and lumpy material are discharged from the outlet for crushing. Separation gas enters the separation pipe through the wind chamber to classify the material, carrying small-sized material into the feeding pipe.

[0008] The spiral discharge machine is characterized in that the feeding pipe and the separating pipe are coaxially arranged and perpendicular to the axis.

[0009] The spiral discharge machine is characterized in that a spiral blade a is provided at the left end of the shaft and a spiral blade b is provided at the right end. The spiral blades a and b rotate in opposite directions. During use, both convey the material to the upper opening of the separation pipe. The spiral blade b is used to clean the material in the motor section and prevent the material from accumulating.

[0010] The spiral discharge machine is characterized in that the spiral blades b used for cleaning the material in the motor section and preventing material accumulation are 0.5 to 2, preferably 1.

[0011] The spiral discharge machine is characterized in that the air chamber includes an upper straight pipe section and a lower cone, both of which are located outside the separator. The upper side of the straight pipe section is connected to an air inlet pipe, and the lower end of the cone is provided with a discharge port. Gas enters tangentially from the air inlet a of the air inlet pipe or the volute, flows through the annular gap between the straight pipe section and the separator, and enters the separator at the cone to classify the material.

[0012] The spiral discharge machine is characterized in that the cross-sectional area of ​​the straight pipe section is 2 to 4 times that of the cross-sectional area of ​​the separation pipe, preferably 2.5 to 3 times; the lower end of the straight pipe section is flush with the lower opening of the separation pipe, and the cone apex angle of the cone is 75° to 110°, preferably 85° to 95°.

[0013] A dryer discharge system with both grading and crushing functions is characterized by comprising a screw conveyor, a star-shaped conveyor a, a crusher, a horizontal feeder, a filter, and a blower, as described in this invention. The upper feed inlet of the crusher is connected to a feed pipe cavity, and the side of the feed pipe cavity is provided with an air inlet b. The top of the feed pipe cavity is connected to the discharge outlet at the lower end of the air chamber of the screw conveyor through the star-shaped conveyor a. The lower discharge outlet of the crusher is connected to the top feed inlet of the horizontal feeder, and the left and right ends of the horizontal feeder are respectively provided with an air inlet c and an air outlet b.

[0014] The inlet of the blower is connected to the filter through a pipeline, and the outlet of the blower is divided into three paths, which are respectively connected to the air inlet b of the upper feed chamber of the crusher, the air inlet c of the horizontal feeder, and the air inlet a of the air chamber of the screw conveyor. The crushed material is carried by the gas and discharged from the air outlet b of the horizontal feeder for gas-solid separation and subsequent processing.

[0015] The dryer discharge system with both grading and crushing functions is characterized by further including a bag filter a and a bag filter b. The air outlet b of the horizontal feeder is connected to the bag filter a through a pipeline, and the air outlet a at the upper end of the feeding pipe of the screw conveyor is connected to the bag filter b through a pipeline.

[0016] The dryer discharge system with both grading and crushing functions is characterized in that it further includes a bag filter b, and the air outlet b of the horizontal feeder and the air outlet a at the upper end of the feeding pipe of the screw feeder are both connected to the bag filter b through pipelines.

[0017] The dryer discharge system that also has a grading and crushing function is characterized by the following process flow:

[0018] 1) Air delivery process

[0019] Air is filtered, pressurized by a fan, and then delivered in three separate streams.

[0020] The first airflow enters from the air inlet a of the air chamber, flows through the separation pipe of the screw conveyor to classify the material, and the small-sized material is discharged from the air outlet a at the upper end of the feeding pipe of the screw conveyor and enters the bag filter b, where the material is separated and centrally processed.

[0021] The second air supply enters from the air inlet b of the feed pipe at the top of the crusher, conveying the block material into the crusher, where it merges with the third air supply.

[0022] The third airflow enters from the air inlet c of the horizontal feeder, carrying the material that has been broken up from the clumps and is discharged from the air outlet b of the horizontal feeder. The material is then separated by a bag filter and processed centrally.

[0023] 2) Material flow

[0024] After drying, the material enters the cylinder of the screw conveyor through the feed inlet and is conveyed to the upper opening of the separation pipe by the screw blades a. The small-sized material is discharged from the upper outlet a of the screw conveyor under the action of the first air flow and is collected by the bag filter b to obtain the product. The larger-sized and lumpy material is crushed by the crusher through the star-shaped conveyor a and falls into the horizontal feeder. Under the action of the third air flow, it is discharged from the outlet b of the horizontal feeder and is collected by the bag filter a or the bag filter b to obtain the product.

[0025] The continuous drying system of this invention connects the dryer's discharge port to a screw conveyor, which also functions as an air-separation and crushing unit. During continuous discharge, air separation is performed first, sending smaller particles to a bag filter for gas-solid separation to obtain the final product. Simultaneously, larger particles and lumps are separated and directly fed into a crusher for further crushing. The crushed material is then conveyed by airflow to the bag filter for gas-solid separation to obtain the final product. This eliminates the need for a separate crushing process, reducing manpower and space requirements.

[0026] Compared with existing technologies, the technical effects achieved by this invention are as follows:

[0027] 1. This invention proposes a dryer discharge system that can also perform grading and crushing functions. The system includes a screw conveyor and a crusher to grade the dried material, break up lumps in a timely manner, reduce the transportation and crushing processes of lumps, and save manpower and space.

[0028] 2. This invention is a closed-loop operation, where materials are transported by airflow, which reduces dust pollution from open-loop operations and the possibility of materials becoming damp. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the screw conveyor of this application;

[0030] Figure 2 This is one of the flow diagrams of the dryer discharge system that also has a grading and crushing function in this application;

[0031] Figure 3 This is the second schematic diagram of the dryer discharge system that also has a grading and crushing function in this application.

[0032] 1. Filter, 2. Fan, 3. Horizontal feeder, 4. Crusher, 5. Rotary rotary valve (a), 6. Screw conveyor, 7. Bag filter (a), 8. Bag filter (b), 9. Exhaust fan (a), 10. Exhaust fan (b), 11. Rotary rotary valve (b), 12. Rotary rotary valve (c)

[0033] 3-1 Air inlet c, 3-2 Air outlet b

[0034] 4-1 Air inlet b, 4-2 Feed pipe cavity

[0035] 6-1 Feed inlet, 6-2 Spiral blade a, 6-3 Cylinder, 6-4 Shaft, 6-5 Spiral blade b, 6-6 Separation pipe, 6-7 Air chamber, 6-8 Air inlet pipe, 6-9 Straight pipe section, 6-10 Cone, 6-11 Discharge outlet, 6-12 Air inlet a, 6-13 Feeding pipe, 6-14 Air outlet a. Detailed Implementation

[0036] The present invention will be further described below with reference to specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0037] Example: Control Figure 1-3

[0038] A screw conveyor includes a concentrically mounted cylinder 6-3, a shaft 6-4, screw blades a 6-2 and b 6-5, and a motor for driving the shaft 6-4 to rotate within the cylinder 6-3. It also includes a separation pipe 6-6 and a feeding pipe 6-13 perpendicular to the cylinder 6-3. The left end of the cylinder 6-3 has a feed inlet 6-1. The feeding pipe 6-13 and the separation pipe 6-6 are respectively located at the upper and lower sides of the middle of the cylinder 6-3 and are connected by air passages. Figure 1 The feeding pipe 6-13 and the separating pipe 6-6 are coaxially arranged and perpendicular to the shaft 6-4. A smooth rod is set in the middle of the shaft 6-4 corresponding to the junction of the separating pipe 6-6 and the feeding pipe 6-13. A spiral blade a 6-2 is installed at the left end of the shaft 6-4, and a spiral blade b 6-5 is installed at the right end. The spiral blades a 6-2 and b 6-5 rotate in opposite directions. During operation, both convey material to the upper opening of the separating pipe 6-6. Spiral blade b 6-5 is used to clean the material inside the cylinder 6-3 near the motor section to prevent material accumulation.

[0039] An air chamber 6-7 is provided on the outside of the separator 6-6. The air chamber 6-7 includes an upper straight pipe section 6-9 and a lower cone 6-10. Both the straight pipe section 6-9 and the cone 6-10 are located on the outside of the separator 6-6. An air inlet pipe 6-8 is connected to the upper side of the straight pipe section 6-9, and an outlet 6-11 is provided at the lower end of the cone 6-10. Gas enters from the air inlet a 6-12 of the air inlet pipe 6-8, flows through the annular gap between the straight pipe section 6-9 and the separator 6-6, and enters the separator 6-6 at the cone 6-10 to classify the material.

[0040] When the screw conveyor of this application is working, the material enters the cylinder 6-3 through the feed inlet 6-1 and falls into the upper opening of the separation pipe 6-6 under the action of the screw blades a 6-2. Under the action of the upward airflow, the small particles are carried by the airflow and flow out through the feed pipe 6-13 and the upper air outlet a 6-14 for gas-solid separation processing. The gas introduced from the air chamber 6-7 can enter the separation pipe 6-6 to classify the material, carrying the small particles into the feed pipe 6-13. The large particles and lumps in the separation pipe 6-6 are discharged from the lower outlet 6-11 of the air chamber 6-7 for crushing processing.

[0041] Furthermore, the cross-sectional area of ​​the straight pipe section 6-9 is 2 to 4 times that of the cross-sectional area of ​​the separation pipe 6-6, preferably 2.5 to 3 times; the lower end of the straight pipe section 6-9 is flush with the lower opening of the separation pipe 6-6, and the cone apex angle of the cone 6-10 is 75° to 110°, preferably 85° to 95°.

[0042] This application also discloses a dryer discharge system that also has a grading and crushing function, including the aforementioned screw conveyor 6, star conveyor a 5, crusher 4, horizontal feeder 3, filter 1, and blower 2. The upper feed inlet of the crusher 4 is connected to a feed pipe 4-2. The side of the feed pipe 4-2 is provided with an air inlet b 4-1, and the top is connected to the discharge port 6-11 at the lower end of the air chamber 6-7 of the screw conveyor 6 through the star conveyor a 5. The lower discharge port of the crusher 4 is connected to the top feed inlet of the horizontal feeder 3. The left and right ends of the horizontal feeder 3 are respectively provided with an air inlet c 3-1 and an air outlet b 3-2.

[0043] The inlet of the blower 2 is connected to the filter 1 through a pipeline. The outlet of the blower 2 is divided into three paths, which are respectively connected to the air inlet b 4-1 of the upper feed chamber 4-2 of the crusher 4, the air inlet c 3-1 of the horizontal feeder 3, and the air inlet a 6-12 of the air chamber 6-7 of the screw conveyor. The crushed material is carried by the gas and discharged from the air outlet b 3-2 of the horizontal feeder 3 and undergoes gas-solid separation processing.

[0044] Comparison Figure 2 The dryer discharge system of this application also includes bag dust collectors a7 and b8. The air outlet b3-2 of the horizontal feeder 3 is connected to the bag dust collector a7 via a pipeline. The air outlet a6-14 at the upper end of the feeding pipe 6-13 of the screw conveyor 6 is connected to the bag dust collector b8 via a pipeline. The top of the bag dust collectors a7 and b8 is connected to the induced draft fan a9 and induced draft fan b10 via pipelines, and the bottom discharge port is equipped with a star-shaped discharge machine b11 and a star-shaped discharge machine c12.

[0045] Comparison Figure 3 The dryer discharge system of this application may further include a bag filter b 8. The air outlet b 3-2 of the horizontal feeder 3 and the air outlet a 6-14 at the upper end of the feeding pipe 6-13 of the screw conveyor 6 are both connected to the bag filter b 8 through pipelines. The top of the bag filter b 8 is connected to an induced draft fan b 10 through a pipeline, and a star-shaped discharge machine c 12 is provided at the bottom discharge port.

[0046] Comparison Figure 2 This invention discloses a process flow for a dryer discharge system that also has a grading and crushing function, including the following processes:

[0047] 1) Air delivery process

[0048] Air is filtered by filter 1, pressurized by fan 2, and then delivered in three separate streams.

[0049] The first airflow enters the separation pipe 6-6 of the screw conveyor 6 through the air inlet a 6-12 of the air chamber 6-7 to classify the material. The material with smaller particle size is discharged from the air outlet a 6-14 at the upper end of the feeding pipe 6-13 of the screw conveyor 6 and sent to the bag filter b 8 for gas-solid separation.

[0050] The second air supply enters from the air inlet b 4-1 of the upper feed pipe 4-2 of the crusher 4 and transports the block material into the crusher, where it merges with the third air supply.

[0051] The third airflow enters from the air inlet c 3-1 of the horizontal feeder 3, and carries the material after the agglomerates are broken up and discharged from the air outlet b 3-2 of the horizontal feeder 3 to be sent to the bag filter a 7 or bag filter b 8 for gas-solid separation.

[0052] 2) Material flow

[0053] After drying, the material enters the cylinder 6-3 of the screw conveyor 6 through the feed inlet 6-1. Under the push of the screw blades a 6-2, it is conveyed to the upper opening of the separation pipe 6-6. The small particle size material is discharged from the air outlet a 6-14 at the upper end of the feed pipe 6-13 of the screw conveyor 6 under the action of the first air flow, and is collected by the bag filter b 8 to obtain the product. The larger particle size and blocky material are crushed by the star-shaped discharger a 5 and fall into the horizontal feeder 3 after being crushed by the crusher 4. Under the action of the third air flow, it is discharged from the air outlet b 3-2 of the horizontal feeder 3 and is collected by the bag filter a 7 or the bag filter b 8 to obtain the product.

[0054] The contents described in this specification are merely an enumeration of the implementation forms of the inventive concept, and the scope of protection of this invention should not be regarded as limited to the specific forms described in the embodiments.

Claims

1. A dryer discharge system with a function of classifying crushing, characterized in that The system includes a screw conveyor (6), a star-shaped conveyor a (5), a crusher (4), a horizontal feeder (3), a filter (1), and a blower (2). The upper feed port of the crusher (4) is connected to a feed pipe (4-2). The feed pipe (4-2) has an air inlet b (4-1) on its side and is connected to the lower discharge port (6-11) of the air chamber (6-7) of the screw conveyor (6) via the star-shaped conveyor a (5). The lower discharge port of the crusher (4) is connected to the upper feed port of the horizontal feeder (3). The left and right ends of the horizontal feeder (3) are respectively provided with an air inlet c (3-1) and an air outlet b (3-2). The inlet of the blower (2) is connected to the filter (1) through a pipeline. The outlet of the blower (2) is divided into three paths, which are respectively connected to the air inlet b (4-1) of the feed chamber (4-2) at the top of the crusher (4), the air inlet c (3-1) of the horizontal feeder (3), and the air inlet a (6-12) of the wind chamber (6-7) of the screw conveyor. The crushed material is carried by the gas and discharged from the air outlet b (3-2) of the horizontal feeder (3) for gas-solid separation and subsequent processing. It also includes bag filter a (7) and bag filter b (8). The outlet b (3-2) of the horizontal feeder (3) is connected to the bag filter a (7) through a pipeline. The outlet a (6-14) at the upper end of the feed pipe (6-13) of the screw conveyor is connected to the bag filter b (8) through a pipeline. The screw conveyor includes a concentrically mounted cylinder (6-3), a shaft (6-4), screw blades a (6-2), and screw blades b (6-5), and a motor for driving the shaft (6-4) to rotate within the cylinder (6-3), as well as a separation pipe (6-6) and a feeding pipe (6-13) perpendicular to the cylinder (6-3). The left end of the cylinder (6-3) has a feed inlet (6-1). The feeding pipe (6-13) and the separation pipe (6-6) are respectively located at the upper and lower sides of the middle of the cylinder (6-3) and are connected by air passages. A wind chamber (6-7) is provided on the outer side of the separation pipe (6-6). The shaft (6-4) is positioned at the intersection of the separation pipe (6-6) and the feeding pipe (6-13). The connecting part is set as a smooth rod, with a spiral blade a (6-2) on the left end and a spiral blade b (6-5) on the right end; the material enters the cylinder (6-3) from the feed port (6-1), and falls into the upper pipe opening of the separation pipe (6-6) under the action of the spiral blade a (6-2). Under the action of the upward airflow, the small particle size material is carried by the airflow and flows out from the upper air outlet a (6-14) through the feeding pipe (6-13) for gas-solid separation and processing. The large particle size material and the agglomerated material are discharged from the discharge port (6-11) for crushing processing; the separation gas enters the separation pipe (6-6) through the air chamber (6-7) to classify the material, and carries the small particle size material into the feeding pipe (6-13).

2. The dryer discharge system as described in claim 1, characterized in that... The feeding pipe (6-13) and the separating pipe (6-6) are coaxially arranged and perpendicular to the shaft (6-4).

3. The dryer discharge system as described in claim 1, characterized in that... The left end of the shaft (6-4) is provided with a spiral blade a (6-2), and the right end is provided with a spiral blade b (6-5). The spiral blades a (6-2) and b (6-5) rotate in opposite directions. During use, they both convey the material to the opening of the separator (6-6). The spiral blade b (6-5) is used to clean the material in the motor section to prevent material accumulation.

4. The dryer discharge system according to claim 3, characterized in that... The spiral blade b (6-5) uses 0.5 to 2 spiral blades.

5. The dryer discharge system according to claim 4, characterized in that... The spiral blade b (6-5) uses one spiral blade.

6. The dryer discharge system as described in claim 1, characterized in that... The air chamber (6-7) includes an upper straight pipe section (6-9) and a lower cone (6-10). Both the straight pipe section (6-9) and the cone (6-10) are located outside the separator (6-6). The upper side of the straight pipe section (6-9) is connected to an air inlet pipe (6-8), and the lower end of the cone (6-10) is provided with an outlet (6-11). Gas enters tangentially from the air inlet a (6-12) of the air inlet pipe (6-8) or the volute, flows through the annular gap between the straight pipe section (6-9) and the separator (6-6), and enters the separator (6-6) at the cone (6-10) to classify the material.

7. The dryer discharge system as described in claim 6, characterized in that... The cross-sectional area of ​​the straight pipe section (6-9) is 2 to 4 times that of the cross-sectional area of ​​the separation pipe (6-6); the lower end of the straight pipe section (6-9) is flush with the lower opening of the separation pipe (6-6), and the cone apex angle of the cone (6-10) is 75° to 110°.

8. The dryer discharge system as described in claim 7, characterized in that... The cross-sectional area of ​​the straight pipe section (6-9) is 2.5 to 3 times that of the cross-sectional area of ​​the separation pipe (6-6); the lower end of the straight pipe section (6-9) is flush with the lower opening of the separation pipe (6-6), and the cone apex angle of the cone (6-10) is 85° to 95°.

9. The dryer discharge system as described in claim 1, characterized in that... The process includes the following steps: 1) Air delivery process Air is filtered by filter (1), pressurized by fan (2), and then delivered in three directions; The first airflow enters through the air inlet a (6-12) of the air chamber (6-7), flows through the separation pipe (6-6) of the screw conveyor (6) to classify the material, and the small-sized material is discharged from the air outlet a (6-14) at the upper end of the feeding pipe (6-13) of the screw conveyor (6) and enters the bag filter b (8) to separate the material and process it centrally. The second air stream enters from the air inlet b (4-1) of the feed pipe cavity (4-2) at the upper end of the crusher (4) and merges with the third air stream; The third airflow enters from the air inlet c (3-1) of the horizontal feeder (3), and carries the material that has been broken up from the agglomerates out from the air outlet b (3-2) of the horizontal feeder (3). The material is then separated and centrally processed by the bag filter a (7). 2) Material flow After drying, the material enters the cylinder (6-3) of the screw conveyor (6) through the feed inlet (6-1) and is conveyed to the upper pipe of the separation pipe (6-6) under the push of the screw blades a (6-2). The small particle size material is discharged from the air outlet a (6-14) at the upper end of the feed pipe (6-13) of the screw conveyor (6) under the action of the first air path and is collected by the bag dust collector b (8) to obtain the product. The large particle size material and the agglomerated material are crushed by the crusher (4) through the star-shaped discharge machine a (5) and fall into the horizontal feeder (3). Under the action of the third air path, it is discharged from the air outlet b (3-2) of the horizontal feeder (3) and is collected by the bag dust collector a (7) to obtain the product.

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