An internal cooling conveyor roller for metallurgical processes

Abstract

An internal cooling conveyor roller for metallurgical processes belongs to the technical field of metallurgical equipment. The present invention solves the problem that the cooling direction of the roller body of the internal cooling conveyor roller is unclear and the cooling media entering and exiting the inner cavity of the roller are mixed and intertwined. The present invention installs the internal cooling guide cylinder inside the roller body of the conveyor roller. The outer cylindrical surface of the internal cooling guide cylinder cooperates with the inner cylindrical surface of the roller body to form a matching space. Its inner hole is tightly matched with the outer cylindrical surface of the cooling medium introduction cylinder installed in the center of the conveyor roller; the matching space between the outer cylindrical surface of the internal cooling guide cylinder and the inner cylindrical surface of the roller body forms a sandwich cooling layer; the rotary joint is installed on the driven side shaft head end face of the conveyor roller by bolt connection. The present invention realizes the full closure of the cooling circuit, one-way flow, and complete separation of water inlet and return water, which strengthens the cooling effect of the roller body, effectively reduces the roller surface temperature, and achieves the goals of low deformation and long life.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical equipment, and in particular relates to an internal cooling conveying roller for metallurgical processes. Background Art

[0002] Roller conveying is a crucial step in the metallurgical process, used to transport or move various billets (such as continuously cast billets). The temperatures of the transported billets and other objects are relatively high, and through contact heat transfer, convection heat transfer, and thermal radiation, the overall temperature of the conveyor rollers rises, with the roller surface temperature rising even more significantly. Under extremely harsh operating conditions, the rollers can experience additional thermal deformation over time, significantly reducing their mechanical strength and wear resistance. This increases the probability of cracks in the transported special billets, thus affecting billet quality. Consequently, stringent requirements are placed on the integrity of conveyor roller equipment.

[0003] The roller body is usually cooled by water, which is to introduce water into the interior of the roller through a rotary joint, filling the entire roller cavity. The incoming water and the return water are intertwined and mixed together. A large amount of incoming water is retained, and the drainage is mis-drained. The direct cooling of the roller body is unclear, the cooling medium efficiency cannot be fully utilized, the cooling effect is poor, and a large amount of power energy for transporting the cooling medium is wasted. Summary of the Invention

[0004] The present invention aims to solve the problems of unclear cooling direction of the internally cooled conveyor roller body and mixing and interweaving of cooling media entering and exiting the inner cavity of the roller body. The present invention implements enhanced directional cooling of the conveyor roller body, completely separates the inlet and outlet of the cooling medium, and quickly discharges the conveyor roller body through a rotary joint. The conveyor roller body is forced to cool according to the outlet water temperature, and the temperature of the entire conveyor roller is controlled below 70°C, thereby improving the service life of the conveyor roller.

[0005] The present invention adopts the following technical solution: the internal cooling conveyor roller includes a roller body 1, an internal cooling guide tube 2, a cooling medium inlet pipe 3, a driven side bearing 4, a driven side bearing seat 5, a rotary joint 6, a roller support beam 7, a driving side shaft head 8, a bolt 9, a driving side bearing 10, a driving side bearing seat 11, a driving side steel plate 12, a driven side steel plate 13, and a driven side shaft head 14.

[0006] The internal cooling guide cylinder 2 is installed inside the conveyor roller body composed of the roller body 1, the driving side shaft head 8, the driving side steel plate 12, the driven side steel plate 13 and the driven side shaft head 14. Bearings and bearing seats are symmetrically installed at both ends of the conveyor roller body. The driving side bearing 10 is installed inside the driving side bearing seat 11 and on the shaft neck of the driving side shaft head 8. The driven side bearing 4 is installed inside the driven side bearing seat 5 and on the shaft neck of the driven side shaft head 14. The driving side bearing seat 11 and the driven side bearing seat 5 are installed on the roller support beam 7, and the roller support beam 7 is fixed; the external rotational power is transmitted to the end of the driving side shaft head 8 to connect the shaft extension to realize the rotating transportation function of the conveyor roller. The outer surface of the internal cooling guide tube 2 forms a fitting space with the inner surface of the roller body 1, while its inner bore tightly fits the outer surface of the cooling medium inlet pipe 3 installed in the center of the conveyor roller. The fitting space between the outer surface of the internal cooling guide tube 2 and the inner surface of the roller body 1 forms a gap cooling layer. The rotary joint 6 on the driven side of the conveyor roller is attached to the end surface of the driven-side shaft head 14 of the conveyor roller via bolts 9. The central cylinder of the rotary joint 6 fits tightly within the cooling medium inlet pipe 3, supplying pressurized cooling medium into the pipe. The cooling medium inlet pipe 3 extends into the hole of the driving-side shaft head 8 on the driving side of the conveyor roller, forming an annulus with the inner wall of the hole. The driving-side steel plate 12 forms a gap layer with the left end surface of the internal cooling guide tube 2, while the driven-side steel plate 13 forms a gap layer with the right end surface of the internal cooling guide tube 2. The cooling medium inlet pipe 3 forms an annulus with the inner bore wall of the driven-side shaft head 14. The cooling medium is collected here and then discharged from the conveyor roller body through the rotary joint 6. The annulus and the gap layer are connected to form a closed-loop pipeline.

[0007] The outer circle of the internal cooling guide cylinder 2 is a smooth cylindrical surface, and a gap layer is formed between the outer circle of the internal cooling guide cylinder 2 and the inner circle of the roller body 1.

[0008] The outer circle of the internal cooling guide cylinder 2 is distributed with axially parallel rectangular grooves or rectangular spiral grooves.

[0009] One end of the conveyor roller is provided with a connecting shaft on the driving side thereof, which is connected to drive the conveyor roller to rotate, and the other end is provided with a rotary joint on the driven side. The rotary joint introduces water into the driving side of the roller through the cooling medium inlet pipe provided in the center of the roller to cool the bearings and bearing seats. The water flows in the opposite direction, and after being radially split in the gap formed by the left end face of the internal cooling guide cylinder and the surface of the steel plate on the driving side of the conveyor roller, it flows into the rectangular spiral groove of the internal cooling guide cylinder (to facilitate machining of the cooling water tank of the internal cooling guide cylinder, it can also be a straight cooling water tank, which shortens the cooling length but weakens the cooling effect). The outer circle of the internal cooling guide cylinder and the inner circle of the roller body are matched with the national standard. Under the action of water pressure, the water flows through the rectangular spiral groove of the cooling guide cylinder and flows to the conveyor roller. On the driven side of the conveyor roller, the water flows radially from the gap formed by the right end face of the internal cooling guide cylinder and the surface of the driven side steel plate to the center of the roller, where it flows into the annulus formed by the outer diameter of the cooling medium inlet tube and the inner wall of the driven side shaft head. This cools the driven side bearing and driven side bearing seat of the conveyor roller. The outlet water is discharged from the roller through the rotary joint, while also carrying away the high-temperature heat collected by the conveyor roller during the flow of the cooling medium. The heat exchange method for cooling the conveyor roller is mainly convection heat transfer, supplemented by a small amount of conduction heat transfer. The temperature of the conveyor roller body is controlled by the intensity cooling of the cooling water to achieve the required conveyor roller body temperature. The cooling circuit formed by the flow of the cooling medium in and out is fully enclosed, with the inlet and return water completely separated, fully utilizing the cooling medium energy. The cooling water trough is located on the internal cooling guide cylinder, greatly facilitating machining. The fit between the outer diameter of the internal cooling guide cylinder and the inner diameter of the roller body can be either a clearance fit or an interference fit. While the clearance fit allows for some channeling of the water in the cooling water trough, the water pressure generally propels it forward, eliminating any cooling medium stagnation. The internal cooling guide cylinder, in contact with the interior of the roller body and coaxially assembled, supports and reinforces the conveyor roller body, particularly for long roller bodies.

[0010] When the outer circle of the internal cooling guide cylinder is made into a smooth cylindrical surface, a certain gap is left between the outer circle of the internal cooling guide cylinder and the inner circle of the conveyor roller body to form a gap cooling. The heat accumulated on the conveyor roller body by heat conduction in harsh working conditions is taken away purely through convection heat transfer, which also plays a role in cooling the conveyor roller as a whole.

[0011] The present invention has the following advantages: Due to the structural design provided by the present invention, the cooling circuit of the internally cooled conveyor roller used in the metallurgical process is fully enclosed, with unidirectional flow of the cooling medium, thus improving cooling efficiency. The internal cooling guide cylinder is machined separately, making the cooling trough formation and assembly of the internal cooling guide cylinder simple and easy. Targeted, enhanced cooling of the conveyor roller body is achieved at a set temperature, and forced cooling of the conveyor roller body is performed according to the outlet water temperature of the rotary joint to achieve the desired conveyor roller body temperature. This maintains the mechanical performance of the conveyor roller equipment in good condition, thus ensuring the quality of the conveyed objects. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a design diagram for an internally cooled conveyor roller for metallurgical processes. It includes: 1. Roller body; 2. Internal cooling guide cylinder; 3. Cooling medium inlet pipe; 4. Driven side bearing; 5. Driven side bearing seat; 6. Rotary joint; 7. Roller support beam; 8. Driven side shaft end; 9. Bolts; 10. Driven side bearing; 11. Driven side bearing seat; 12. Driven side steel plate; 13. Driven side steel plate; 14. Driven side shaft end.

[0013] Figure 2 This is a structural diagram of an internal cooling guide tube of part 2. The left and right internal cooling guide tubes of part 2 have the same structure, radially diverting or converging the cooling medium, and the outer surface is machined with cooling grooves or formed into a smooth cylindrical surface. DETAILED DESCRIPTION

[0014] The specific implementation of the present invention will be described in detail below with reference to the accompanying drawings.

[0015] The roller body 1, the driving side shaft head 8, the driving side steel plate 12, the driven side steel plate 13 and the driven side shaft head 14 constitute the conveyor roller body. The external rotational power is input to the connecting shaft extension at the end of the driving side shaft head 8 of the conveyor roller. The driving side bearing 10 on the left side of the conveyor roller is installed inside the driving side bearing seat 11 and on the journal of the driving side shaft head 8; the driven side bearing 4 on the right side of the conveyor roller is installed inside the driven side bearing 5 and on the journal of the driven side shaft head 14; the driving side bearing seat 11 and the driven side bearing seat 5 are installed on the roller support beam 7, and the roller support beam 7 is fixed. The interaction of several parts realizes the function of rotating transportation of the conveyor roller.

[0016] See also Figure 1 As shown, the rotary joint 6 on the driven side of the conveyor roller conveyor introduces cooling water into the cooling medium inlet pipe 3. The cooling medium inlet pipe 3 extends into the interior of the conveyor roller conveyor and passes into the hole inside the driving side shaft head 8 on the driving side of the other end of the conveyor roller conveyor, forming an annulus with the inner wall of the hole. The cooling medium has almost no heat exchange during the conveying process; please refer to Figure 2As shown, the direction of the arrow indicates the flow direction of the cooling medium. After cooling the driving side bearing 10 and the driving side bearing seat 11 on the driving side of the conveyor roller, the cooling medium is radially diverted into the rectangular spiral groove of the internal cooling guide tube 2 in the gap layer formed by the driving side steel plate 12 and the left end face of the internal cooling guide tube 2. The pitch of the rectangular spiral groove is set to the length of the internal cooling guide tube 2, that is, the cooling medium cools the inner surface of the conveyor roller body for one circle and then flows out into the driven side of the conveyor roller; taking the outer diameter of the conveyor roller body Ф415mm as an example, the number of circumferential segments of the rectangular spiral groove on the outer circle of the internal cooling guide tube 2 is 8 to 12; the groove width of the rectangular spiral groove is 30 to 40mm on the axial section of the internal cooling guide tube 2, the groove depth is 5 to 30mm, and the groove spacing is evenly distributed in the length direction of the internal cooling guide tube 2; as shown If the cooling groove depth is set to 0mm, that is, when the outer circle of the internal cooling guide cylinder 2 is made into a smooth cylindrical surface, a certain gap is left between the outer circle of the internal cooling guide cylinder 2 and the inner circle of the roller body. The circumferential radial gap distance is 5 to 20mm and is evenly distributed. A gap cooling is formed between the outer circle of the internal cooling guide cylinder 2 and the inner circle of the conveyor roller body 1; the cooling medium forms a gap layer in the driven side steel plate 13 on the driven side of the conveyor roller and the right end face of the internal cooling guide cylinder 2, and then flows radially toward the middle to form an annulus formed by the outer circle of the cooling medium inlet pipe 3 and the inner hole wall of the driven side shaft head 14, so as to cool the driven side bearing 4 and the driven side bearing seat 5 on the right side of the conveyor roller. The outlet water is discharged from the conveyor roller by the rotary joint 6, and at the same time, it takes away the high-temperature heat of the conveyor roller collected by the cooling medium in the cooling circuit, thereby realizing the overall cooling of the conveyor roller.

[0017] The rotary joint 6 is fixed to the end face of the driven side shaft head 14 of the conveyor roller by bolts 9, which is convenient for the maintenance and replacement of the rotary joint 6; the processing requirements of the installation end face and the installation hole are Ra3.2 or above, and a sealing ring is applied to the connection joint surface to increase the sealing effect. The entire metallurgical process uses an internal cooling conveyor roller cooling circuit to achieve a fully closed and unidirectional cooling flow, making full use of the cooling efficiency of the cooling medium. When the temperature detection element detects that the key part of the conveyor roller has a local high temperature, the cooling intensity is increased by adjusting the cooling medium outlet pressure, thereby ensuring that the conveyor roller operates at a normal temperature, enabling it to exert normal equipment performance and prolonging the life of the conveyor roller.

Claims

1. An internal cooling conveyor roller for metallurgical processes, characterized by: The conveyor roller comprises a roller body (1), an internal cooling guide cylinder (2), a cooling medium inlet pipe (3), a driven side bearing (4), a driven side bearing seat (5), a rotary joint (6), a roller support beam (7), a driving side shaft head (8), a bolt (9), a driving side bearing (10), a driving side bearing seat (11), a driving side steel plate (12), a driven side steel plate (13), and a driven side shaft head (14); The internal cooling guide cylinder (2) is installed inside the conveying roller body composed of the roller body (1), the driving side shaft head (8), the driving side steel plate (12), the driven side steel plate (13) and the driven side shaft head (14). The bearings and bearing seats are symmetrically installed at both ends of the conveying roller body. The driving side bearing (10) is installed inside the driving side bearing seat (11) and on the shaft neck of the driving side shaft head (8). The driven side bearing (4) is installed inside the driven side bearing seat (5) and on the shaft neck of the driven side shaft head (14). The driving side bearing seat (11) and the driven side bearing seat (5) are installed on the roller support beam (7), and the roller support beam (7) is fixed. The external rotational power is transmitted to the end of the driving side shaft head (8) and connected to the shaft extension. The outer cylindrical surface of the internal cooling guide cylinder (2) cooperates with the inner cylindrical surface of the roller body (1) to form a matching space, and the inner hole is tightly matched with the outer cylindrical surface of the cooling medium inlet pipe (3) installed in the center of the conveying roller. The outer The matching space between the cylindrical surface and the inner cylindrical surface of the roller body (1) forms a gap cooling layer; the rotary joint (6) on the driven side of the conveyor roller is connected and installed on the end face of the driven side shaft head (14) of the conveyor roller by bolts (9); the central cylinder of the rotary joint (6) is tightly fitted into the cooling medium introduction pipe (3), and the rotary joint (6) on the driven side of the conveyor roller introduces the cooling medium into the cooling medium introduction pipe (3); the cooling medium introduction pipe (3) extends into the inside of the hole of the driving side shaft head (8) on the driving side of the conveyor roller, and forms an annulus with the inner wall surface of the hole; the driving side steel plate (12) and the left end face of the internal cooling guide cylinder (2) form a gap layer, and the driven side steel plate (13) and the right end face of the internal cooling guide cylinder (2) form a gap layer; the outer circle of the cooling medium introduction pipe (3) and the inner hole wall surface of the driven side shaft head (14) form an annulus, and the cooling medium is collected here and discharged from the conveyor roller body by the rotary joint (6), and the annulus and the gap layer are connected to form a closed loop pipeline; The outer circle of the internal cooling guide cylinder (2) is a smooth cylindrical surface, and a gap layer is formed between the outer circle of the internal cooling guide cylinder (2) and the inner circle of the roller body (1); The outer circle of the internal cooling guide cylinder (2) is distributed with axially parallel rectangular grooves or rectangular spiral grooves.

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