Cooling system for continuous rolling core rod of hot-rolled seamless steel pipe

Abstract

The utility model relates to the technical field of hot-rolled seamless steel pipe production equipment, and discloses a cooling system for a hot-rolled seamless steel pipe continuous rolling core rod, which comprises a fixing frame, a water tank fixedly connected to the upper surface of the fixing frame, flow dividing pipes fixedly connected to the left side and the right side of the water tank, and cooling branch pipes fixedly connected to the bottoms of the flow dividing pipes. The bottom ends of the cooling branch pipes are in threaded connection with threaded cylinders, the bottoms of the threaded cylinders are fixedly connected with sprayers, supporting rings are fixedly connected into the sprayers, the upper surfaces of the supporting rings are fixedly connected with elastic rubber rings, and filter covers are arranged above the elastic rubber rings. According to the cooling device, the cooling branch pipes made of high-temperature-resistant engineering plastics are adopted, blockage caused by rusting in the pipelines or influence on the flushing and cooling effect on the core rod are avoided, cooling liquid at the spraying position can be completely filtered through cooperation of the threaded cylinder, the supporting ring, the elastic rubber ring and the filtering cover, and the cooling effect is improved. And the nozzle is prevented from being blocked by mixed impurities in cooling liquid.

Description

Technical Field

[0001] This utility model relates to the technical field of hot-rolled seamless steel pipe production equipment, and in particular to a cooling system for a mandrel used in the continuous rolling of hot-rolled seamless steel pipes. Background Technology

[0002] The mandrel in hot-rolled seamless steel pipe continuous rolling is a key tool in the production of hot-rolled seamless steel pipe. It is mainly used in continuous rolling mills (such as limited-movement mandrel continuous rolling mills, MPM) to ensure that the steel pipe maintains accurate inner diameter, wall thickness uniformity and surface quality during the rolling process. In the continuous rolling process of POF hot-rolled seamless steel pipe, the mandrel is subjected to a great heat load in the high-temperature rolling environment and needs to be cooled efficiently through the cooling circulation zone to extend its service life.

[0003] Existing cooling systems for mandrels in continuous hot rolling of steel pipes mostly use iron cooling water pipes, which are prone to corrosion under high temperature and high environment for a long time, leading to cooling water pollution, pipe blockage, and reduced cooling efficiency. In addition, traditional water nozzles have simple structures, and impurities in the cooling water are easy to accumulate, which can easily lead to uneven spraying and make the mandrel risk of local overheating. Therefore, a cooling system for mandrels in continuous hot rolling of seamless steel pipes is proposed to solve the above problems. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a cooling system for mandrels in hot-rolled seamless steel pipe continuous rolling, which aims to improve the problems of easy corrosion and blockage of mandrels in steel pipe continuous rolling in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a cooling system for continuously rolling mandrels of hot-rolled seamless steel pipes, comprising a fixed frame, a water tank fixedly connected to the upper surface of the fixed frame, a diversion pipe fixedly connected to both the left and right sides of the water tank, a cooling branch pipe fixedly connected to the bottom of the diversion pipe, a threaded cylinder threadedly connected to the bottom end of the cooling branch pipe, a nozzle fixedly connected to the bottom of the threaded cylinder, a support ring fixedly connected inside the nozzle, an elastic rubber ring fixedly connected to the upper surface of the support ring, and a filter cover provided above the elastic rubber ring.

[0006] As a further description of the above technical solution:

[0007] The upper surface of the elastic rubber ring is in contact with the bottom surface of the filter cover.

[0008] As a further description of the above technical solution:

[0009] The upper surface of the filter cover is in contact with the bottom surface of the cooling branch pipe.

[0010] As a further description of the above technical solution:

[0011] A fixing ring is fixedly connected to the outside of the cooling branch pipe, and the bottom surface of the fixing ring is in contact with the upper surface of the threaded cylinder.

[0012] As a further description of the above technical solution:

[0013] A fan-shaped nozzle is fixedly connected to the bottom end of the nozzle.

[0014] As a further description of the above technical solution:

[0015] A set of rotating rollers is rotatably connected to the inner rear wall surface of the fixed frame, and a sprocket drive assembly is provided on the front side of the fixed frame.

[0016] As a further description of the above technical solution:

[0017] The rotating roller assembly consists of several rotating rollers arranged in a left-right linear array and rotatably connected to the inner rear wall surface of the fixed frame. The rotating rollers are connected to each other via a sprocket drive assembly.

[0018] As a further description of the above technical solution:

[0019] The cooling branch pipes are in a number of units, which are fixedly connected to the bottom of the distribution pipe in a straight line array. The distribution pipe is connected to the water tank through a pipe.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, by using a cooling branch pipe made of high-temperature resistant engineering plastic material, the rust inside the pipe is avoided, which may cause blockage or affect the rinsing and cooling effect on the mandrel. Through the cooperation of the threaded cylinder, nozzle, support ring, elastic rubber ring and filter cover, the coolant at the spraying point can be completely filtered to avoid impurities in the coolant from clogging the nozzle or causing impurities to fall onto the mandrel.

[0022] 2. In this invention, the fan-shaped nozzles increase the spraying range, ensuring uniform cooling of the mandrel surface. The rotating roller assembly and sprocket drive assembly work together to rotate the mandrel, allowing the cooling structure to cool the entire surface of the mandrel and improving cooling efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall cooling system for a hot-rolled seamless steel pipe continuous rolling mandrel proposed in this utility model;

[0024] Figure 2 This is a schematic diagram of the cooling branch pipe of a cooling system for a hot-rolled seamless steel pipe continuous rolling mandrel proposed in this utility model.

[0025] Figure 3 This is a schematic diagram of the cooling branch pipe after disassembly, which is part of the cooling system for the continuous rolling mandrel of hot-rolled seamless steel pipe proposed in this utility model.

[0026] Figure 4 This is a schematic diagram showing the support ring, elastic rubber ring, and filter cover after disassembly of the cooling system for the mandrel in the continuous rolling of hot-rolled seamless steel pipes proposed in this utility model.

[0027] Legend:

[0028] 1. Fixing frame; 2. Water tank; 3. Diverter pipe; 4. Cooling branch pipe; 5. Threaded cylinder; 6. Nozzle; 7. Support ring; 8. Elastic rubber ring; 9. Filter cover; 10. Fixing ring; 11. Fan-shaped nozzle; 12. Rotating roller assembly; 13. Sprocket drive assembly. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Reference Figures 1-2 This utility model provides an embodiment of a cooling system for continuously rolling mandrels of hot-rolled seamless steel pipes, including a fixed frame 1. A water tank 2 is fixedly connected to the upper surface of the fixed frame 1. Diversion pipes 3 are fixedly connected to both sides of the water tank 2. The diversion pipes 3 are connected to the water tank 2 via pipes. An FLC flow control valve, a self-cleaning filter, and a booster pump (known in the art and not directly shown in the drawings) are installed on the outside of the pipes. Cooling water enters the cooling branch pipe 4 through the self-cleaning filter. The water spray volume is adjusted by the FLC flow control valve. The bottom of the diversion pipe 3 is fixedly connected to the cooling branch pipe 4, which carries conventional iron cooling water. The tube is replaced with a high-temperature resistant engineering plastic tube (such as PPS, PIEE, or reinforced nylon), which has the characteristics of corrosion resistance, light weight, and good flexibility. When the water pump starts, it can draw the coolant inside the water tank 2 into the cooling branch pipe 4. The booster pump can increase the water pressure and improve the cooling effect on the mandrel. The above structure is the existing technology in this field and will not be described in detail here. Based on the existing nozzle spray angle and the spray coverage of the mandrel surface, the cooling branch pipe 4 on the left can be lengthened by 787mm (the distance between the nozzle and the mandrel surface is ~350mm); the row of parallel cooling branch pipes with a deflection angle of 15° can be lengthened by 330mm.

[0031] There are several cooling branch pipes 4, which are fixedly connected to the bottom of the distribution pipe 3 in a straight line array. The cooling branch pipes 4 and the distribution pipe 3 are connected by stainless steel quick-release flanges for easy maintenance and replacement. The bottom end of the cooling branch pipe 4 is threadedly connected to a threaded cylinder 5, which can be quickly disassembled by turning. The bottom of the threaded cylinder 5 is fixedly connected to a nozzle 6, through which coolant can be sprayed. The bottom end of the nozzle 6 is fixedly connected to a fan-shaped nozzle 11, which can increase the spray cooling range and ensure uniform cooling of the core rod surface. The multiple cooling branch pipes 4 and fan-shaped nozzles 11 can ensure full coverage of the core rod and improve the cooling effect.

[0032] Reference Figures 2-4 The nozzle 6 has a support ring 7 fixedly connected inside. An elastic rubber ring 8 is fixedly connected to the upper surface of the support ring 7. The support ring 7 can support and limit the elastic rubber ring 8. When the elastic rubber ring 8 is compressed downward, it can be compressed and undergo elastic deformation under the limitation of the support ring 7. A filter cover 9 is set above the elastic rubber ring 8. The upper surface of the elastic rubber ring 8 is in contact with the bottom surface of the filter cover 9. The upper surface of the filter cover 9 is in contact with the bottom surface of the cooling branch pipe 4. When the threaded cylinder 5 is threadedly connected to the bottom end of the cooling branch pipe 4, it will place the threaded cylinder 5 on the bottom surface of the cooling branch pipe 4. The internal filter cover 9 is pressed downwards, causing the elastic rubber ring 8 to undergo elastic deformation and apply elastic potential to the filter cover 9. This ensures that the upper end of the filter cover 9 is in close contact with the bottom surface of the cooling branch pipe 4, thus completely filtering the coolant entering the nozzle 6. This prevents impurities from getting stuck in the gap between the filter cover 9 and the inner wall of the threaded cylinder 5, which could cause the filter cover 9 to become stuck and difficult to disassemble. When it is necessary to disassemble the filter cover 9, the threaded cylinder 5 can be unscrewed to release the restriction on the filter cover 9, allowing the filter cover 9 to be quickly disassembled.

[0033] A fixing ring 10 is fixedly connected to the outside of the cooling branch pipe 4. The bottom surface of the fixing ring 10 is in contact with the upper surface of the threaded cylinder 5. The fixing ring 10 can limit the installation of the threaded cylinder 5 and slightly squeeze the filter cover 9. After ensuring that the filter cover 9 is completely in contact with the bottom surface of the cooling branch pipe 4, the bottom surface of the fixing ring 10 will be in contact with the upper surface of the threaded cylinder 5, so that the threaded cylinder 5 can no longer rotate, avoiding excessive twisting that could damage the filter cover 9 and affect its use.

[0034] Reference Figures 1-3A rotating roller assembly 12 is rotatably connected to the inner rear wall surface of the fixed frame 1. A sprocket drive assembly 13 is provided on the front side of the fixed frame 1. The rotating roller assembly 12 is composed of several rotating rollers, which are rotatably connected to the inner rear wall surface of the fixed frame 1 in a left-right linear array. The rotating rollers are connected to each other through the sprocket drive assembly 13. The sprocket drive assembly 13 can drive the rotating rollers that make up the rotating roller assembly 12 to rotate. The gap between adjacent rotating rollers is smaller than the diameter of the mandrel. When the rotating rollers rotate, they can drive the mandrel placed above the rotating roller assembly 12 to rotate, so that the entire surface of the mandrel can be rinsed and cooled, thereby improving the cooling efficiency.

[0035] Working principle: After the mandrel is transported to the top of the rotating roller group 12 via the conveyor rollers, the sprocket drive group 13 is started to drive the mandrel to rotate. At the same time, the FLC control flow valve and booster pump on the outside of the water tank 2 are activated to draw the coolant from the inside of the water tank 2 into the cooling branch pipe 4. Then, the coolant is sprayed downwards through the fan-shaped nozzle 11 to the top of the mandrel for cooling. When the coolant enters the threaded cylinder 5, it will be completely filtered by the filter cover 9 to prevent impurities from clogging the fan-shaped nozzle 11 or falling onto the mandrel. After the device is used, the backwash mode is turned on periodically to clean the water network with high-pressure water flow. The cooling branch pipe 4 can be directly disassembled and rinsed without rust removal. When the filter cover 9 is severely blocked, affecting the cooling effect, the threaded cylinder 5 can be unscrewed to release the limit on the filter cover 9, so that the filter cover 9 can be directly taken out of the threaded cylinder 5 for cleaning. The operation is simple.

[0036] Then, insert the cleaned or new filter cover 9 into the threaded cylinder 5 and screw the threaded cylinder 5 to install it to the bottom of the cooling branch pipe 4 to complete the installation. When the threaded cylinder 5 is in contact with the fixing ring 10 and can no longer be screwed, the cooling branch pipe 4 will squeeze the filter cover 9, causing the elastic rubber ring 8 to be compressed and generating elastic potential energy. This allows the filter cover 9 to fit against the bottom surface of the cooling branch pipe 4, preventing gaps that could cause impurities to get stuck in the gap between the filter cover 9 and the threaded cylinder 5, making it difficult to disassemble the filter cover 9.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cooling system for mandrels used in the continuous rolling of hot-rolled seamless steel pipes, comprising a fixing frame (1), characterized in that: A water tank (2) is fixedly connected to the upper surface of the fixed frame (1). A diversion pipe (3) is fixedly connected to both the left and right sides of the water tank (2). A cooling branch pipe (4) is fixedly connected to the bottom of the diversion pipe (3). A threaded cylinder (5) is threadedly connected to the bottom of the cooling branch pipe (4). A nozzle (6) is fixedly connected to the bottom of the threaded cylinder (5). A support ring (7) is fixedly connected inside the nozzle (6). An elastic rubber ring (8) is fixedly connected to the upper surface of the support ring (7). A filter cover (9) is provided above the elastic rubber ring (8).

2. The cooling system for a mandrel used in the continuous rolling of hot-rolled seamless steel pipes according to claim 1, characterized in that: The upper surface of the elastic rubber ring (8) is in contact with the bottom surface of the filter cover (9).

3. The cooling system for a mandrel used in the continuous rolling of hot-rolled seamless steel pipes according to claim 1, characterized in that: The upper surface of the filter cover (9) is in contact with the bottom surface of the cooling branch pipe (4).

4. A cooling system for a mandrel used in the continuous rolling of hot-rolled seamless steel pipes according to claim 1, characterized in that: A fixing ring (10) is fixedly connected to the outside of the cooling branch pipe (4), and the bottom surface of the fixing ring (10) is in contact with the upper surface of the threaded cylinder (5).

5. A cooling system for a mandrel used in the continuous rolling of hot-rolled seamless steel pipes according to claim 1, characterized in that: The bottom end of the nozzle (6) is fixedly connected to a fan-shaped nozzle (11).

6. A cooling system for a mandrel used in the continuous rolling of hot-rolled seamless steel pipes according to claim 1, characterized in that: A rotating roller assembly (12) is rotatably connected to the inner rear wall surface of the fixed frame (1), and a sprocket drive assembly (13) is provided on the front side of the fixed frame (1).

7. A cooling system for a mandrel used in the continuous rolling of hot-rolled seamless steel pipes according to claim 6, characterized in that: The rotating roller group (12) consists of several rotating rollers, which are arranged in a left-right linear array and rotated on the inner rear wall surface of the fixed frame (1). The rotating rollers are connected to each other through a sprocket drive group (13).

8. A cooling system for a mandrel used in the continuous rolling of hot-rolled seamless steel pipes according to claim 1, characterized in that: The number of cooling branch pipes (4) is several. Several cooling branch pipes (4) are fixedly connected to the bottom of the diversion pipe (3) in a straight line array. The diversion pipe (3) is connected to the water tank (2) through a pipe.

Images