Water cooled screw conveyor

Abstract

This invention discloses a water-cooled screw conveyor, relating to the technical field of material conveying equipment. It includes a screw shaft assembly, a screw cylinder, a cooling system, thermocouples, a transmission system, and a discharge unit. The screw shaft assembly comprises a hollow main shaft and screw blades. The hollow main shaft has an axially extending cooling medium circulation channel inside, and a rotary joint is installed at one end of the hollow main shaft, with a main shaft water outlet at one end. The screw cylinder includes an inner cylinder and an outer cylinder, with the outer cylinder fitted over the inner cylinder. The two are sealed and welded together by an annular end plate to form a closed jacketed cooling water chamber. This invention achieves a triple cooling system—internal cooling of the hollow main shaft, external cooling of the cylinder jacket, and internal spray cooling—through an internal cooling subsystem, an external cooling subsystem, and a spray cooling subsystem. This system simultaneously achieves comprehensive cooling of both the material and the conveying body, providing comprehensive cooling functionality and significantly improved cooling efficiency.

Description

Technical Field

[0001] This invention relates to the field of material conveying equipment technology, specifically a water-cooled screw conveyor. Background Technology

[0002] In industries such as metallurgy, cement, and chemicals, effective material cooling and cooling of the screw conveyor itself are critical functional requirements when high-temperature material conveying is involved.

[0003] Existing spiral conveyor cooling mechanisms have limited cooling functions, making it difficult to achieve simultaneous cooling of both materials and the cylinder. Furthermore, their cooling efficiency is low, failing to meet the cooling requirements of high-temperature materials (such as boiler slag and bed ash at 800℃-1000℃). This can easily lead to overheating and wear of conveyor components, affecting the service life and conveying stability of the equipment. Therefore, we propose a water-cooled spiral conveyor. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a water-cooled screw conveyor. The triple cooling system can simultaneously achieve comprehensive cooling of materials and the conveying body, with comprehensive cooling function and significantly improved cooling efficiency, effectively extending the overall service life of the equipment and the conveying stability, and can effectively solve the problems in the background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a water-cooled screw conveyor, comprising a screw shaft assembly, a screw cylinder, a cooling system, a thermocouple, a transmission system, and a discharge unit; The spiral shaft assembly includes a hollow main shaft and spiral blades. The hollow main shaft has an axially extending cooling medium circulation channel inside. A rotary joint is installed at one end of the hollow main shaft, and a main shaft outlet is provided at one end. The spiral cylinder includes an inner cylinder and an outer cylinder. The outer cylinder is fitted onto the outside of the inner cylinder, and the two are sealed and welded together by an annular end plate to form a closed jacketed cooling water chamber. The spiral shaft is coaxially installed in the inner cylinder. The bottom of the outer cylinder is provided with an outer cylinder water inlet, and the top is provided with an outer cylinder water outlet. A cooling system is installed on the spiral cylinder, which includes an internal cooling subsystem, an external cooling subsystem, and a spray cooling subsystem.

[0006] Furthermore, the internal cooling subsystem consists of the rotary joint, the inner cavity of the hollow spindle, and the second water inlet pipe. The second water inlet pipe is connected to the inner cavity of the hollow spindle through the rotary joint, and the cooling water circulates continuously inside the hollow spindle through the rotary joint.

[0007] Furthermore, the external cooling subsystem consists of the jacketed cooling water chamber and the water distribution pipe. One end of the water distribution pipe is connected to the water inlet pipe, and the other end is connected to the water inlet of the outer cylinder.

[0008] Furthermore, the spray cooling subsystem includes a spray water tank and a water inlet pipe. The spray water tank is located on the inner wall of the inner cylinder, and spray holes are provided inside the spray water tank. The water inlet pipe is connected to the water inlet of the spray water tank.

[0009] Furthermore, the inlets of both the first and second water inlets are connected to an external cooling water tank, and both are equipped with solenoid valves and ball valves.

[0010] Furthermore, the transmission system includes a motor, a reducer, and a bearing with a mounting seat; the hollow main shaft is installed in the inner cylinder through the bearing with a mounting seat, one end of which is connected to the output shaft of the reducer through a chain and a sprocket, the input shaft of the reducer is connected to the output shaft of the motor through a belt and a pulley, and the motor and the reducer are installed on a motor support on the feed end side of the inner cylinder.

[0011] Furthermore, the discharge unit includes an ash outlet one, an ash outlet two, and a material spray outlet, which are respectively located at the bottom of the inner cylinder. The ash outlet two is used for material output, and the ash outlet one is used for cleaning the material accumulated at the feed end.

[0012] Furthermore, the spiral blades are welded to the hollow main shaft, and the blade surface is in direct contact with the material, which is used to transfer the cooling energy transmitted by the cooling medium inside the hollow main shaft to the material.

[0013] Furthermore, the mounted bearing is a high-temperature self-aligning roller bearing, filled with high-temperature grease, and is suitable for temperatures not lower than 200°C. The inner cylinder is made of heat-resistant stainless steel sheet rolled and welded, and its inner wall forms a material conveying channel.

[0014] Furthermore, multiple thermocouples are provided and installed at the feed end, middle section and discharge end of the inner cylinder, respectively, for real-time monitoring of material temperature and inner cylinder wall temperature.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This water-cooled screw conveyor has the following advantages: 1. The hollow main shaft is cooled internally through an internal cooling subsystem, an external cooling subsystem, and a spray cooling subsystem. This triple cooling system, consisting of internal cooling of the hollow main shaft, external cooling of the cylinder jacket, and spray cooling inside the cylinder, can simultaneously achieve comprehensive cooling of both the material and the conveying body. The cooling function is comprehensive and the cooling efficiency is significantly improved.

[0016] 2. Equipped with a closed-loop temperature control system that monitors and regulates cooling water flow in real time using multiple thermocouples, the system provides precise temperature control and can adjust the operating status of each cooling circuit according to the actual temperature of the material to meet different working conditions.

[0017] 3. The structure is reasonably designed, which facilitates disassembly and maintenance, effectively extending the overall service life of the equipment and improving the stability of the conveying process. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the water-cooled screw conveyor of the present invention; Figure 2 This is a schematic diagram of the water flow direction of the hollow main shaft of the water-cooled screw conveyor of the present invention.

[0019] In the diagram: 1. Spiral shaft assembly; 2. Inner cylinder; 3. Outer cylinder; 4. Motor; 5. Belt and pulley; 6. Reducer; 7. Chain and sprocket; 8. Motor support; 9. Belt bearing; 10. Ash outlet one; 11. Spray water tank; 12. Thermocouple; 13. Ash outlet two; 14. Outer cylinder water inlet; 15. Solenoid valve; 16. Ball valve; 17. Water inlet pipe one; 18. Water inlet pipe two; 19. Outer cylinder water outlet; 20. Main shaft water outlet; 21. Material spray water outlet. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Please see Figure 1-2 This embodiment provides a technical solution: a water-cooled screw conveyor, characterized in that it includes a screw shaft assembly 1, a screw cylinder, a cooling system, a thermocouple 12, a transmission system, and a discharge unit; The spiral shaft assembly 1 includes a hollow main shaft and spiral blades. The hollow main shaft has an axially extending cooling medium circulation channel inside. A rotary joint is installed at the end of the hollow main shaft, and a main shaft outlet 20 is provided at one end. The spiral blades are welded to the hollow main shaft, and the blade surface is in direct contact with the material to transfer the cold energy transferred by the cooling medium inside the hollow main shaft to the material, thereby achieving efficient heat exchange. The rotary joint is installed at the drive end and non-drive end of the hollow main shaft, which can maintain the continuous supply and discharge of cooling water while the hollow main shaft is rotating. The spiral cylinder includes an inner cylinder 2 and an outer cylinder 3. The outer cylinder 3 is fitted outside the inner cylinder 2, and the two are sealed and welded together by an annular end plate to form a closed jacketed cooling water chamber. The spiral shaft assembly 1 is coaxially installed in the inner cylinder 2. The bottom of the outer cylinder 3 is provided with an outer cylinder water inlet 14, and the top is provided with an outer cylinder water outlet 19. A cooling system is installed on the spiral cylinder, which includes an internal cooling subsystem, an external cooling subsystem, and a spray cooling subsystem.

[0022] The internal cooling subsystem consists of a rotary joint, the inner cavity of the hollow spindle, and a second water inlet pipe 18. The second water inlet pipe 18 is connected to the inner cavity of the hollow spindle through the rotary joint. The cooling water circulates continuously in the hollow spindle through the rotary joint, realizing the flow of cooling water in the hollow spindle and axially cooling the spiral shaft assembly 1, the spiral cylinder, and the materials in contact with it. The external cooling subsystem consists of a jacketed cooling water chamber and a water distribution pipe. One end of the water distribution pipe is connected to the water inlet pipe 18, and the other end is connected to the water inlet 14 of the outer cylinder. Cooling water enters the jacketed cooling water chamber from the bottom, flows from bottom to top through the entire outer periphery of the inner cylinder 2, and is discharged from the top, forming an external cooling circulation loop. The spray cooling subsystem includes a spray water tank 11 and an inlet pipe 17. The spray water tank 11 is located on the inner wall of the inner cylinder 2. Spray holes are provided inside the spray water tank 11. The inlet pipe 17 is connected to the inlet of the spray water tank 11. Cooling water is sprayed into the inner cylinder 2 through the spray holes provided inside the spray water tank 11, directly contacting the high-temperature material for heat exchange, and simultaneously performing dust reduction treatment on the material. The inlets of both water inlet pipe 17 and water inlet pipe 2 are connected to an external cooling water tank, and both are equipped with a solenoid valve 15 and a ball valve 16.

[0023] The transmission system includes a motor 4, a reducer 6, and a seated bearing 9. The hollow main shaft is installed in the inner cylinder 2 via the seated bearing 9. One end of the main shaft is connected to the output shaft of the reducer 6 via a chain and sprocket 7. The input shaft of the reducer 6 is connected to the output shaft of the motor 4 via a belt and pulley 5. The motor 4 and the reducer 6 are mounted on a motor support 8 on the feed end side of the inner cylinder 2. Some models are equipped with a variable frequency speed control motor, which can flexibly adjust the speed according to the conveying volume. The seated bearing 9 is fixed to the end plate of the inner cylinder 2 with bolts, isolating it from the high-temperature material area and reducing dust intrusion and heat radiation. The seated bearing 9 is a high-temperature self-aligning roller bearing filled with high-temperature grease, with an applicable temperature of not less than 200℃, extending its service life in high-temperature environments. The front and rear seated bearings 9 jointly support the screw shaft assembly 1, bearing the radial and axial loads generated during the screw conveying process. The inner cylinder 2 is rolled and welded from heat-resistant stainless steel plate, and its inner wall forms a material conveying channel. The hollow main shaft is driven to rotate by the motor 4 and the reducer 6, and the screw blades push the material to move axially from the feed port to the discharge port to complete the conveying.

[0024] The discharge unit includes ash outlet 10, ash outlet 23 and material spray outlet 21, which are respectively located at the bottom of the inner cylinder 2. Ash outlet 23 is used for material output, and ash outlet 10 is used for cleaning the material accumulated at the feed end.

[0025] Multiple thermocouples 12 are installed at the feed end, intermediate section and discharge end of the inner cylinder 2, respectively, to monitor the material temperature and the cylinder wall temperature of the inner cylinder 2 in real time and feed them back to the control system. The control system can adjust the cooling water flow rate through the solenoid valve 15 and ball valve 16 according to the temperature signal monitored by the thermocouples 12, so as to ensure that the material is cooled to the target temperature, which can usually be reduced from 800℃-1000℃ to below 100℃, thus realizing closed-loop temperature control.

[0026] Working principle: After startup, motor 4 drives the hollow main shaft to rotate, pushing the material from the feed port to the discharge port. Cooling water simultaneously exchanges heat through three cooling paths. The internal cooling subsystem continuously circulates the cooling water in the hollow main shaft through a rotary joint, realizing the flow of cooling water in the hollow main shaft and axially cooling the spiral shaft assembly 1, the spiral cylinder, and the material in contact with it. The external cooling subsystem's cooling water enters the jacketed cooling water chamber from the bottom, flows from bottom to top through the entire outer circumference of the inner cylinder 2, and is discharged from the top, forming an external cooling circulation loop. The spray cooling subsystem sprays the cooling water into the inner cylinder 2 through the spray holes set inside the spray water tank 11, directly contacting the high-temperature material for heat exchange, while simultaneously performing dust reduction treatment on the material. Thermocouple 12 monitors the temperature of each section, and the control system adjusts the valves of each water circuit according to the set value, so that the material temperature drops from 800–1000℃ to below 100℃, achieving safe discharge.

[0027] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A water-cooled screw conveyor, characterized in that: It includes a screw shaft assembly (1), a screw cylinder, a cooling system, a thermocouple (12), a transmission system, and a discharge unit; The spiral shaft assembly (1) includes a hollow main shaft and spiral blades. The hollow main shaft has an axially extending cooling medium circulation channel inside. A rotary joint is installed at the end of the hollow main shaft, and a main shaft outlet (20) is provided at one end. The spiral cylinder includes an inner cylinder (2) and an outer cylinder (3). The outer cylinder (3) is fitted outside the inner cylinder (2). The two are sealed and welded together by an annular end plate to form a closed jacketed cooling water chamber. The spiral shaft assembly (1) is coaxially installed in the inner cylinder (2). The bottom of the outer cylinder (3) is provided with an outer cylinder water inlet (14) and the top is provided with an outer cylinder water outlet (19). A cooling system is installed on the spiral cylinder. The cooling system includes an internal cooling subsystem, an external cooling subsystem and a spray cooling subsystem.

2. The water-cooled screw conveyor according to claim 1, characterized in that: The internal cooling subsystem consists of the rotary joint, the inner cavity of the hollow spindle, and the second water inlet pipe (18). The second water inlet pipe (18) is connected to the inner cavity of the hollow spindle through the rotary joint, and the cooling water circulates continuously inside the hollow spindle through the rotary joint.

3. A water-cooled screw conveyor according to claim 2, characterized in that: The external cooling subsystem consists of the jacketed cooling water chamber and the water distribution pipe. One end of the water distribution pipe is connected to the second water inlet pipe (18), and the other end is connected to the water inlet (14) of the outer cylinder.

4. A water-cooled screw conveyor according to claim 3, characterized in that: The spray cooling subsystem includes a spray water tank (11) and an inlet pipe (17). The spray water tank (11) is located on the inner wall of the inner cylinder (2). Spray holes are provided inside the spray water tank (11). The inlet pipe (17) is connected to the inlet of the spray water tank (11).

5. A water-cooled screw conveyor according to claim 4, characterized in that: The inlets of the first water inlet pipe (17) and the second water inlet pipe (18) are both connected to the external cooling water tank, and both are equipped with a solenoid valve (15) and a ball valve (16).

6. A water-cooled screw conveyor according to claim 1, characterized in that: The transmission system includes a motor (4), a reducer (6), and a bearing (9); the hollow main shaft is installed in the inner cylinder (2) through the bearing (9), and one end of it is connected to the output shaft of the reducer (6) through a chain and a sprocket (7). The input shaft of the reducer (6) is connected to the output shaft of the motor (4) through a belt and a pulley (5). The motor (4) and the reducer (6) are installed on a motor support (8) on the feed end side of the inner cylinder (2).

7. A water-cooled screw conveyor according to claim 1, characterized in that: The discharge unit includes an ash outlet one (10), an ash outlet two (13) and a material spray outlet (21), which are respectively located at the bottom of the inner cylinder (2). The ash outlet two (13) is used for material output, and the ash outlet one (10) is used for cleaning the material accumulated at the feed end.

8. A water-cooled screw conveyor according to claim 1, characterized in that: The spiral blades are welded to the hollow main shaft, and the blade surface is in direct contact with the material.

9. A water-cooled screw conveyor according to claim 6, characterized in that: The seated bearing (9) is a high-temperature self-aligning roller bearing, with an applicable temperature of not less than 200℃. The inner cylinder (2) is made of heat-resistant stainless steel sheet rolled and welded, and its inner wall forms a material conveying channel.

10. A water-cooled screw conveyor according to claim 5, characterized in that: Multiple thermocouples (12) are provided and are respectively installed at the feed end, middle section and discharge end of the inner cylinder (2) for real-time monitoring of material temperature and inner cylinder wall temperature (2).

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