Water cooling circulation system for rolling mill

Abstract

The utility model discloses a kind of rolling mill water-cooling circulation systems, including clean ring pool (1), the top of clean ring pool (1) is equipped with cooling tower (2), still including multiple air-water coolers connected with different direct current motor (4) respectively, air-water cooler connects water tank (5), the bottom of clean ring pool (1) is equipped with water inlet main pipe (6), water pump (7) is equipped on water inlet main pipe (6), water inlet main pipe (6) is connected with multiple water tank (5) by multiple water inlet branch pipes (8) respectively, the top of cooling tower (2) is equipped with backwater main pipe (9), backwater main pipe (9) is connected with multiple water tank (5) by multiple backwater branch pipes (10) respectively, multiple water tank (5) is divided into two groups according to the water delivery direction of water inlet main pipe (6), three-way valve (11) is equipped on the backwater branch pipe (10) connected with rear group water tank (5).The utility model has the advantages of avoiding direct current motor overheating, improving rolling mill production efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of rolling mills, and in particular relates to a water-cooling circulation system for rolling mills. Background Technology

[0002] Rolling mills are crucial equipment in steel mills, shaping steel into desired forms. A steel mill typically has multiple rolling mills operating simultaneously. The power source for rolling mills is a DC motor. DC motors bear extremely heavy loads and generate significant heat, necessitating a water-cooling circulation system to dissipate this heat and prevent mill shutdowns due to DC motor overheating protection.

[0003] The existing water-cooled circulation system includes a clean circulating water tank, a cooling tower above the clean circulating water tank, and multiple air-water coolers connected to different rolling mill DC motors. The air-water coolers are connected to water tanks. The bottom of the clean circulating water tank has a main inlet pipe with a water pump. The main inlet pipe is connected to multiple water tanks through multiple inlet branch pipes. The top of the cooling tower has a main return water pipe, which is connected to multiple water tanks through multiple return water branch pipes.

[0004] The existing water-cooled circulation system works by having a built-in internal circulation fan in a DC motor transfer heat to an air-water cooler. The cooling water in the water tank circulates through the air-water cooler, carrying away the heat. A water pump draws cooling water from the clean circulation pool. The cooling water enters multiple water tanks through the main inlet pipe and multiple inlet branch pipes, then enters the main return pipe through multiple return branch pipes, and finally enters the cooling tower. After cooling, it re-enters the clean circulation pool for reuse.

[0005] In actual production, it was found that after the production cycle ended and the equipment entered maintenance mode, the water pump stopped accordingly. Under the action of gravity, the water in the pipeline flowed back to the clean circulation water tank. The pipeline was filled with air. When the equipment was restarted after maintenance, the air in the return water branch pipe was prone to air blockage because the buoyancy of the air was opposite to the downward force of the water flow. This was especially true for the water tank, which was far from the water pump. After the water pump pressure was depressurized in the front, the longer pipeline generated more water delivery resistance, and the water supply pressure was significantly reduced. It was difficult to overcome the air blockage resistance, resulting in no water flow through the water tank. The cooling water in the water tank continued to absorb heat but could not be discharged. After the temperature rose, it was difficult to effectively dissipate heat from the DC motor. The DC motor was prone to overheat protection shutdown, which reduced production efficiency. Utility Model Content

[0006] The purpose of this invention is to provide a water-cooled circulation system for rolling mills. This invention has the advantages of preventing DC motor overheating and improving rolling mill production efficiency.

[0007] The technical solution of this utility model is as follows: a rolling mill water cooling circulation system, including a clean circulation water tank, a cooling tower above the clean circulation water tank, and multiple air-water coolers connected to different DC motors. The air-water coolers are connected to water tanks. A main inlet pipe is located at the bottom of the clean circulation water tank, and a water pump is installed on the main inlet pipe. The main inlet pipe is connected to multiple water tanks through multiple inlet branch pipes. A return water main pipe is located at the top of the cooling tower, and multiple water tanks are connected to the return water main pipe through multiple return water branch pipes. The multiple water tanks are divided into two groups according to the water supply direction of the main inlet pipe. A three-way valve is installed on the return water branch pipe connected to the rear group of water tanks, and two ports of the three-way valve are connected in series on the return water branch pipe.

[0008] In the aforementioned rolling mill water cooling circulation system, a water flow indicator is installed on the return water branch pipe equipped with a three-way valve.

[0009] In the aforementioned rolling mill water-cooling circulation system, the three-way valve and the water flow indicator are both connected to the rolling mill's control system.

[0010] In the aforementioned rolling mill water cooling circulation system, the water inlet branch pipe is equipped with a first shut-off valve.

[0011] In the aforementioned rolling mill water cooling circulation system, a second shut-off valve is installed on the return water branch pipe connected to the front water tank.

[0012] In the aforementioned rolling mill water-cooling circulation system, both the first shut-off valve and the second shut-off valve are connected to the rolling mill's control system.

[0013] Compared with existing technologies, this invention adds a three-way valve to the return water branch pipe of the rear water tank, based on the existing water cooling circulation system. When there is no water flow through the rear water tank due to air blockage, the end of the three-way valve not connected to the return water branch pipe can be opened to allow air to escape from the return water branch pipe, eliminating the air blockage. This allows the cooling water pumped by the water pump to flow smoothly through the rear water tank, ensuring that the cooling water in the tank is at a lower temperature, preventing the DC motor from overheating and shutting down, and improving the production efficiency of the rolling mill. Therefore, this invention has the advantages of preventing DC motor overheating and improving rolling mill production efficiency.

[0014] Furthermore, by installing a water flow indicator connected to the rolling mill control system on the return water branch pipe, the water flow in the return water branch pipe is detected by the water flow indicator. When no water is flowing, timely intervention is taken to further prevent the DC motor from overheating. By setting a first shut-off valve and a second shut-off valve, the water pressure originally delivered to the front water tank can be temporarily transferred to the rear water tank, further ensuring smooth venting of the return water branch pipe of the rear water tank. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] The labels in the attached diagram are: 1-Clean circulation water tank, 2-Cooling tower, 4-DC motor, 5-Water tank, 6-Inlet main pipe, 7-Water pump, 8-Inlet branch pipe, 9-Return main pipe, 10-Return branch pipe, 11-Three-way valve, 12-Water flow indicator, 13-First shut-off valve, 14-Second shut-off valve. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0018] Example 1: Water-cooled circulation system for rolling mills, such as Figure 1 As shown, the system for cooling the DC motors on four rolling mills includes a circulating water tank 1, a cooling tower 2 above the circulating water tank 1, and four air-water coolers connected to the DC motors 4 on different rolling mills respectively. Figure 1 (omitted in the middle), the air-water cooler is connected to the water tank 5.

[0019] The bottom of the circulating water tank 1 is equipped with a main inlet pipe 6, and a water pump 7 is mounted on the main inlet pipe 6. The main inlet pipe 6 is connected to four water tanks 5 via four branch inlet pipes 8. The top of the cooling tower 2 is equipped with a main return water pipe 9, and the main return water pipe 9 is connected to four water tanks 5 via four branch return water pipes 10. The characteristics of the rolling mill water cooling circulation system are as follows: The four water tanks 5 are divided into two groups according to the water supply direction of the main water inlet pipe 6. The front group and the rear group each include two water tanks 5. The rear group water tank 5 ( Figure 1 The two on the right side are connected to the return water branch pipe 10, which is equipped with an electrically controlled three-way valve 11. Two of the ports of the three-way valve 11 are connected in series with the return water branch pipe 10, and the other port of the three-way valve 11 is used to vent air.

[0020] A water flow indicator 12 is installed on the return water branch pipe 10, which is equipped with a three-way valve 11.

[0021] Each of the four inlet branch pipes 8 is equipped with an electrically controlled first shut-off valve 13. The return branch pipe 10 connected to the front water tank 5 is equipped with an electrically controlled second shut-off valve 14.

[0022] The three-way valve 11, the first shut-off valve 13, the second shut-off valve 14, and the water flow indicator 12 are all connected to the rolling mill's control system.

[0023] Example 1 adds a three-way valve 11, a first shut-off valve 13, a second shut-off valve 14, and a water flow indicator 12 to the existing circulation system and connects them to the control system of the rolling mill.

[0024] Working principle of Example 1: For the rear water tank 5, since it is located at the end of the water supply, the total length of the front water supply pipe is longer, and the water supply resistance is inherently greater. When there is air blockage in the return water branch pipe 10, all the water flow circulates through the front water tank, causing the temperature of the rear water tank 5 to rise continuously. Consequently, the heat dissipation effect of the corresponding air-water cooler is reduced, and the DC motor 4 is prone to overheating protection. Based on this, a water flow indicator 12 is installed on the return water branch pipe 10 of the rear water tank to detect whether there is water flow through the return water branch pipe 10. When there is no water flow, it indicates that there is air in the return water branch pipe 10. The water flow indicator 12 sends a signal to the rolling mill control system, and the control system opens the vent end of the three-way valve 11, allowing the air to be discharged from the return water branch pipe 10. After water flow is generated in the return water branch pipe 10, the vent end of the three-way valve 11 is closed. If the vent of the three-way valve 11 is open for a period of time, such as 1 minute, and the water flow indicator 12 still does not detect water flow in the return branch pipe 10, the control system closes the first shut-off valve 13 and the second shut-off valve 14 on the inlet branch pipe 8 and the return branch pipe 10 connected to the front water tank, and concentrates the water pump pressure to supply water to the rear water tank until the air in the return branch pipe 10 of the rear water tank is discharged. After the water flow indicator 12 detects water flow, the control system opens the first shut-off valve 13 and the second shut-off valve 14 again and closes the vent of the three-way valve 11.

[0025] Example 2: Compared with Example 1, the difference is that the three-way valve 11, the first shut-off valve 13, and the second shut-off valve 14 are mechanical valves and are not connected to the control system.

[0026] When the water flow indicator 12 detects that there is no water flow in the return water branch pipe 10, the control system sends the information to the display panel of the rolling mill and activates the alarm system of the rolling mill to remind the workers to handle the situation. The workers then manually open the three-way valve 11 to release the air.

[0027] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A rolling mill water cooling circulation system, comprising a clean circulating water tank (1), a cooling tower (2) above the clean circulating water tank (1), and multiple air-water coolers connected to different DC motors (4), the air-water coolers being connected to water tanks (5), a main inlet pipe (6) at the bottom of the clean circulating water tank (1), a water pump (7) on the main inlet pipe (6), the main inlet pipe (6) being connected to multiple water tanks (5) via multiple inlet branch pipes (8), and a return water main pipe (9) at the top of the cooling tower (2), the return water main pipe (9) being connected to multiple water tanks (5) via multiple return water branch pipes (10), characterized in that: Multiple water tanks (5) are divided into two groups according to the water supply direction of the main water inlet pipe (6). The return water branch pipe (10) connected to the rear group water tank (5) is equipped with a three-way valve (11). Two ports of the three-way valve (11) are connected in series on the return water branch pipe (10).

2. The rolling mill water-cooling circulation system according to claim 1, characterized in that: A water flow indicator (12) is provided on the return water branch pipe (10) equipped with a three-way valve (11).

3. The rolling mill water-cooling circulation system according to claim 2, characterized in that: The three-way valve (11) and the water flow indicator (12) are both connected to the control system of the rolling mill.

4. The rolling mill water-cooling circulation system according to claim 1, characterized in that: The water inlet branch pipe (8) is equipped with a first shut-off valve (13).

5. The rolling mill water-cooling circulation system according to claim 4, characterized in that: A second shut-off valve (14) is installed on the return water branch pipe (10) connected to the front water tank (5).

6. The rolling mill water-cooling circulation system according to claim 5, characterized in that: The first shut-off valve (13) and the second shut-off valve (14) are both connected to the control system of the rolling mill.

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