Water-cooling roller device for conveying metal plates

Abstract

The utility model relates to the field of transportation or storage devices, in particular to a water-cooling roller device for conveying metal plates. The water-cooling roller device for conveying the metal plates comprises a rack (1) and is characterized by further comprising a water-cooling roller (2), a water return rotating shaft (3), a bearing (4), a rotating joint (5), a water inlet pipe (6) and a water outlet branch pipe (7), and the water-cooling roller (2) comprises an outer cylinder (21), an inner sleeve (22) and an end plate (23); the water cooling roller (2) is arranged on the water return rotating shaft (3) in a sleeving mode through end plates (23) at the two ends. The water inlet pipe (6) is inserted into an inner cavity of the water return rotating shaft (3), and the joints of the water return rotating shaft (3) and the two end plates (23) are communicated with the water return area. The cooling device is uniform in cooling and long in service life.

Description

Technical Field

[0001] This utility model relates to the field of transportation or storage devices, specifically a water-cooled roller device for conveying metal sheets. Background Technology

[0002] Continuous cold-rolled galvanizing units rely on the rolling of rollers to transport steel sheets. Since the temperature is very high during the galvanizing process, it is conducted through the steel sheet to the rollers, causing the rollers to withstand high temperatures. Therefore, the rollers need to be cooled by water cooling.

[0003] The first application scenario: In continuous cold-rolled galvanizing units, the top roller is located at the top of the post-galvanizing cooling tower and is the first roller that the strip steel comes into contact with after immersion in galvanizing. The working characteristics of the post-galvanizing top roller: The strip steel enters the zinc pot from the annealing furnace, where the zinc liquid temperature is generally around 460℃. After exiting the zinc pot, the strip steel passes through an air knife and enters the post-galvanizing cooling tower. The cooling tower uses a vertically upward, non-contact cooling fan to rapidly cool the strip steel before it enters the top roller, where the temperature drops to 260~300℃. The relatively high temperature of the strip steel at the top roller of the tower places demands on the design and manufacturing of the top roller. Therefore, the top roller is generally designed with a large diameter and perforations in the web plates at both ends to increase friction and utilize rotation to achieve natural ventilation cooling. This design is suitable for producing ordinary galvanized products. However, if producing post-galvanized alloyed products, the strip steel undergoes a reheating process, and even after forced cooling, the strip steel temperature may still exceed 300℃. To reduce the impact of high temperatures on the top roller, a water-cooled roller is used, with circulating cooling water flowing inside the roller for cooling. The water-cooled roller is a key component of the top roller. In addition, the top roller surface is generally a spray-coated roller, which has high hardness and good wear resistance. The top roller is equipped with an upper pressure roller, which is used to press down the strip when the machine is stopped or at low speed. Both the top roller and the pressure roller are equipped with drive.

[0004] The second application scenario involves a continuous cold-rolled silicon steel production line where a coating process is sensitive to strip temperature. The strip surface temperature entering the coating process must be kept constant at around 20 degrees Celsius. Under normal summer conditions, achieving this temperature is difficult, leading to a series of coating defects and affecting the quality of subsequent processes. To ensure the strip temperature, water-cooled rollers are needed. The cooling medium differs from the circulating water used in the previous process; the temperature is even lower in this scenario, requiring a chilled water system.

[0005] Current problems with water-cooled roller equipment:

[0006] 1. The water-cooled roller has a complex internal structure and requires high machining precision. The original design used a fully rigid tube connection. After the roller surface comes into contact with the strip steel, the fully rigid tube structure is prone to leakage points due to uneven heating inside and outside, making maintenance difficult and causing significant impact from water leakage.

[0007] 2. Currently, water-cooled rollers have various water inlet and outlet methods, which can easily lead to dead zones and poor water return. This results in uneven temperature on the inner surface of the roller, poor cooling effect, and heat deformation, which can cause problems such as increased dynamic imbalance, abnormal wear of the rotary joint sealing sleeve, and even leakage of new water into the return water pipe. Utility Model Content

[0008] In order to overcome the shortcomings of the prior art and provide a conveying device with uniform temperature distribution and improved cooling effect, this utility model discloses a water-cooled roller device for conveying metal sheets.

[0009] This utility model achieves its invention objective through the following technical solution:

[0010] A water-cooled roller device for conveying metal sheets includes a frame disposed on one side of a metal sheet production line. The device further includes a water-cooled roller, a return water shaft, bearings, a rotary joint, an inlet pipe, and an outlet branch pipe.

[0011] The water-cooled roller includes an outer cylinder, an inner sleeve, and end plates. Both the outer cylinder and the inner sleeve are cylindrical tubes. The outer cylinder is fitted outside the inner sleeve, and the central axes of the outer cylinder and the inner sleeve coincide with each other. Both ends of the outer cylinder and the inner sleeve are sealed with end plates. A return water zone is formed between the outer cylinder and the inner sleeve. A water guide plate is provided on the outer side wall of the inner sleeve.

[0012] The water-cooled roller is mounted on the return water shaft through end plates at both ends. The return water shaft is a hollow shaft and is located on the central axis of the water-cooled roller. One end of the return water shaft is held in place by a bearing and a rotary joint and is mounted on the frame through a bearing seat outside the bearing. The other end of the return water shaft is held in place by a bearing and is mounted on the frame through a bearing seat outside the bearing.

[0013] The inlet pipe is inserted into the inner cavity of the return water shaft. A return water pipe is formed between the inner wall of the return water shaft and the outer wall of the inlet pipe. The outlet end of the inlet pipe is connected to one end of at least three outlet branch pipes through a connector. The inlet end of the inlet pipe is connected to a water source. The other end of the outlet branch pipe is connected to the outer side of the inner sleeve, so that the outlet branch pipe and the return water area are connected. The connection between the return water shaft and the two end plates is connected to the return water area.

[0014] The pressure roller is rotatably mounted on one side of the water-cooled roller via the pressure roller frame. The central axes of the pressure roller and the water-cooled roller are parallel to each other. The metal sheet is attached to the outer side of the outer cylinder of the water-cooled roller. The pressure roller frame presses down the pressure roller so that the outer sides of the pressure roller and the outer cylinder clamp the metal sheet.

[0015] The water-cooled roller device for conveying metal sheets is characterized in that: the water guide plate is divided into two sections and is spirally wound and fixed on the outer side wall of the inner sleeve, and the two sections of the water guide plate are left-handed and right-handed respectively.

[0016] The water-cooled roller device for conveying metal sheets is characterized by:

[0017] The bearing housing is water-cooled;

[0018] The outlet branch pipe is made of either a rigid metal pipe and a flexible metal pipe connected in sequence, or a rigid metal pipe and a corrugated metal pipe connected in sequence.

[0019] When using this utility model, the following steps should be followed in sequence:

[0020] S1. Water Inlet: Cooling water is introduced into the water inlet pipe through the water inlet end and then into the return water area between the inner wall of the outer cylinder and the outer wall of the inner sleeve through the water outlet branch pipe;

[0021] S2. Clamping: The metal sheet is attached to the outer side of the water-cooled roller outer cylinder, and the pressure roller frame presses down the pressure roller so that the outer sides of the pressure roller and the outer cylinder clamp the metal sheet;

[0022] S3. Water return: The water return shaft is driven to rotate by the drive motor. The water return shaft drives the outer cylinder to rotate synchronously. The water-cooled roller and the pressure roller rotate relative to each other to transport the metal sheet. The water inlet pipe and the inner sleeve remain stationary. The cooling water in the water return zone between the inner wall of the outer cylinder and the outer wall of the inner sleeve cools the outer cylinder and is collected by the water guide plate to the front and rear ends of the water return zone, and then flows out through the water return pipe.

[0023] When applied to galvanizing units, this invention is used at the top of the post-galvanizing cooling tower, in conjunction with circulating cooling water, to cool the strip steel; when applied to silicon steel units, it is used before the coating machine, in conjunction with a chilled water-water cooling circulation system, to cool the strip steel.

[0024] In this invention, the water outlet branch pipes are designed to be evenly distributed circumferentially, which is beneficial for the rotational balance of the rollers. At the joints between rigid pipes, flexible metal hoses are used instead, which act as "expansion joints" to help absorb thermal deformation. The outer cylinder is the roller itself, and the outer cylinder and inner sleeve are machined separately.

[0025] This invention employs a central water inlet with left and right spiral guide plates designed according to the rotation direction, allowing water to return through both sides. This method is better than other structural forms. By utilizing the centrifugal force of rotation, it can effectively eliminate the dead zone of water return, making the inner surface temperature of the roller more uniform and the cooling effect better.

[0026] To improve reliability, the rotary joint adopts a design where the inlet pipe does not rotate but extends deep into the roller core. It is connected to the water-cooled roller by a gap-sealed copper sleeve, with a gap range of 0.2~0.6mm. Cooling water enters the rotating water-cooled roller body through this gap and begins to flow. At the same time, the other side is connected to the return water area. Due to the gap, a small amount of cooling water that leaks normally can directly return to the return water pipe. The return water pipe rotates with the roller and is connected by a flange. The rotary joint ensures a tight seal during rotation.

[0027] To better protect the bearing and extend its lifespan, a water-cooled bearing housing is designed, through which circulating cooling water is introduced to cool the outer ring of the bearing.

[0028] This utility model has the following beneficial effects:

[0029] The system effectively utilizes centrifugal force to solve problems such as dead zones in the return water and thermal deformation caused by uneven cooling; the water cooling system is directly connected to the ring cooling water and kept in a constantly open state, eliminating the need for a control system, making it simple and convenient; field feedback indicates stable performance, easy maintenance, and few malfunctions; it improves the cooling effect of the fluid and extends the service life of the water-cooled roller. Attached Figure Description

[0030] Figure 1 This is the front view of this utility model.

[0031] Figure 2 This is the right view of this utility model.

[0032] Figure 3 This is a cross-sectional view of the water-cooled roller in the main view direction of this utility model.

[0033] Figure 4 This is a cross-sectional view of the water-cooled roller in this utility model from the right-hand side.

[0034] Figure 5 This is a schematic diagram of the water guide plate installed inside the water-cooling roller in this utility model. Detailed Implementation

[0035] The present invention will be further illustrated by specific embodiments below. Example

[0036] A water-cooled roller device for conveying metal sheets includes a frame 1, a water-cooled roller 2, a return water shaft 3, a bearing 4, a rotary joint 5, an inlet pipe 6, and an outlet branch pipe 7. Figures 1-5 As shown, the specific structure is:

[0037] Frame 1 is located on one side of the metal sheet production line;

[0038] The water-cooled roller 2 includes an outer cylinder 21, an inner sleeve 22, and an end plate 23. Both the outer cylinder 21 and the inner sleeve 22 are cylindrical tubes. The outer cylinder 21 is sleeved outside the inner sleeve 22 and the central axes of the outer cylinder 21 and the inner sleeve 22 coincide with each other. Both ends of the outer cylinder 21 and the inner sleeve 22 are closed by the end plate 23 respectively. A water return zone is formed between the outer cylinder 21 and the inner sleeve 22. A water guide plate 24 is provided on the outer side wall of the inner sleeve 22.

[0039] The water-cooled roller 2 is mounted on the return water shaft 3 through the end plates 23 at both ends. The return water shaft 3 is a hollow shaft and is located on the central axis of the water-cooled roller 2. One end of the return water shaft 3 is held in sequence by the bearing 4 and the rotary joint 5 and is mounted on the frame 1 through the bearing seat 41 outside the bearing 4. The other end of the return water shaft 3 is held in sequence by the bearing 4 and is mounted on the frame 1 through the bearing seat 41 outside the bearing 4.

[0040] The inlet pipe 6 is inserted into the inner cavity of the return water shaft 3. A return water pipe is formed between the inner side wall of the return water shaft 3 and the outer side wall of the inlet pipe 6. The outlet end of the inlet pipe 6 is connected to one end of at least three outlet branch pipes 7 through a connector. The inlet end of the inlet pipe 6 is connected to a water source. The other end of the outlet branch pipes 7 is connected to the outer side of the inner sleeve 22, so that the outlet branch pipes 7 and the return water area are connected. The connection between the return water shaft 3 and the two end plates 23 is connected to the return water area.

[0041] The pressure roller 8 is rotatably mounted on one side of the water-cooled roller 2 via the pressure roller frame 81. The central axes of the pressure roller 8 and the water-cooled roller 2 are parallel to each other. The metal sheet 9 is attached to the outer side of the outer cylinder 21 of the water-cooled roller 2. The pressure roller frame 81 presses down on the pressure roller 8 so that the outer sides of the pressure roller 8 and the outer cylinder 21 clamp the metal sheet 9.

[0042] In this embodiment, as shown in the figure, the water guide plate 24 is divided into two sections and is spirally wound and fixed on the outer side wall of the inner sleeve 22. The two sections of the water guide plate 24 are left-handed and right-handed, respectively.

[0043] In this embodiment:

[0044] Bearing housing 41 is water-cooled;

[0045] The outlet branch pipe 7 is made of metal rigid pipe and metal flexible pipe connected in sequence or metal rigid pipe and metal corrugated pipe connected in sequence.

[0046] When using this embodiment, follow these steps in sequence:

[0047] S1. Water inlet: Cooling water is introduced into the water inlet pipe 6 through the water inlet end of the water inlet pipe 6 and then into the return water area between the inner wall of the outer cylinder 21 and the outer wall of the inner sleeve 22 through the water outlet branch pipe 7;

[0048] S2. Clamping: The metal sheet 9 is attached to the outer side of the outer cylinder 21 of the water-cooled roller 2, and the pressure roller frame 81 presses down the pressure roller 8 so that the outer sides of the pressure roller 8 and the outer cylinder 21 clamp the metal sheet 9.

[0049] S3. Water Return: The water return shaft 3 is driven by a drive motor to rotate, which in turn drives the outer cylinder 21 to rotate synchronously. The water-cooled roller 2 and the pressure roller 8 rotate relative to each other to convey the metal sheet 9. Figure 2The middle arrows a and b indicate the conveying direction of the metal sheet 9. The water inlet pipe 6 and the inner sleeve 22 remain stationary. The cooling water in the return water zone between the inner wall of the outer cylinder 21 and the outer wall of the inner sleeve 22 cools the outer cylinder 21 and then is collected by the water guide plate 24 to the front and rear ends of the return water zone, and then flows out through the return water pipe.

Claims

1. A water-cooled roller device for conveying metal sheets, comprising a frame (1), the frame (1) being disposed on one side of a metal sheet production line, characterized in that: It also includes a water-cooled roller (2), a return water shaft (3), a bearing (4), a rotary joint (5), an inlet pipe (6), an outlet branch pipe (7), and a pressure roller (8). The water-cooled roller (2) includes an outer cylinder (21), an inner sleeve (22) and an end plate (23). Both the outer cylinder (21) and the inner sleeve (22) are cylindrical tubes. The outer cylinder (21) is fitted outside the inner sleeve (22) and the central axes of the outer cylinder (21) and the inner sleeve (22) coincide. Both ends of the outer cylinder (21) and the inner sleeve (22) are closed by the end plate (23). A water return zone is formed between the outer cylinder (21) and the inner sleeve (22). A water guide plate (24) is provided on the outer side wall of the inner sleeve (22). The water-cooled roller (2) is mounted on the return water shaft (3) through the end plates (23) at both ends. The return water shaft (3) is a hollow shaft and is located on the central axis of the water-cooled roller (2). One end of the return water shaft (3) is held in place by the bearing (4) and the rotary joint (5) in sequence and is mounted on the frame (1) through the bearing seat (41) outside the bearing (4). The other end of the return water shaft (3) is held in place by the bearing (4) and is mounted on the frame (1) through the bearing seat (41) outside the bearing (4). The inlet pipe (6) is inserted into the inner cavity of the return water shaft (3). A return water pipe is formed between the inner side wall of the return water shaft (3) and the outer side wall of the inlet pipe (6). The outlet end of the inlet pipe (6) is connected to one end of at least three outlet branch pipes (7) through a connector. The inlet end of the inlet pipe (6) is connected to the water source. The other end of the outlet branch pipes (7) is connected to the outer side of the inner sleeve (22) respectively, so that the outlet branch pipes (7) and the return water area are connected. The connection between the return water shaft (3) and the two end plates (23) is connected to the return water area respectively. The pressure roller (8) is rotatably mounted on one side of the water-cooled roller (2) via the pressure roller frame (81). The central axes of the pressure roller (8) and the water-cooled roller (2) are parallel to each other. The metal plate (9) is attached to the outer side of the outer cylinder (21) of the water-cooled roller (2). The pressure roller frame (81) presses down the pressure roller (8) so that the outer sides of the pressure roller (8) and the outer cylinder (21) clamp the metal plate (9).

2. The water cooled roll apparatus for metal sheet conveying according to claim 1, characterized in that: The water guide plate (24) is divided into two sections and is spirally wound and fixed on the outer wall of the inner sleeve (22). The two sections of the water guide plate (24) are left-handed and right-handed, respectively.

3. The water-cooled roller device for conveying metal sheets as described in claim 1 or 2, characterized in that: The bearing housing (41) is water-cooled; The outlet branch pipe (7) is made of metal rigid pipe and metal flexible pipe connected in sequence or metal rigid pipe and metal corrugated pipe connected in sequence.

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