A waste heat recovery device for cooling rollers in an aluminized zinc plating production line

Abstract

This utility model belongs to the field of heat exchanger technology, specifically relating to a waste heat recovery device for cooling rollers in an aluminized zinc plating production line. It includes a heat exchanger body, with a mounting base fixedly connected to the right side of the heat exchanger body. A fixed pipe is fixedly connected inside the mounting base and to the heat exchanger body. A connecting pipe is inserted into the outside of the fixed pipe. This utility model, by setting up components such as a limiting block, a limiting sleeve, and a positioning frame, ensures precise positioning and guidance of the connecting pipe when it is inserted into the fixed pipe, guaranteeing coaxial alignment. After the rotating limiting sleeve engages with the threaded connection of the connecting pipe, the limiting sleeve provides a stable limit to the connecting pipe, ensuring a tight connection between the connecting pipe and the fixed pipe and maintaining long-term stability. This effectively solves the problem of loose connections and easy loosening leading to interface leakage in waste heat recovery devices for cooling rollers in aluminized zinc plating production lines.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, specifically to a waste heat recovery device for cooling rollers in an aluminized zinc plating production line. Background Technology

[0002] During the aluminized zinc plating production line, the annealing furnace cooling roller system continuously cools the high-temperature rollers using circulating water, forming a relatively stable waste heat resource. Currently, the design flow rate of this cooling roller circulating water system is 50 m³ / h. Under normal operating conditions, the supply and return water temperature difference is maintained at 10℃, and the operating temperature range is 58~68℃, carrying a large amount of unutilized heat.

[0003] From a process requirement perspective, aluminized zinc plating production lines, especially those producing hard-coated thin sheets (such as high-strength steel grades like G550), have specific requirements for the temperature of the process water in the alkaline washing process. The target temperature must reach ≥55℃ to ensure the cleaning effect. Meanwhile, the existing open-flame zone gas-water heat exchanger, as the main waste heat recovery equipment, is significantly affected by flue gas temperature (e.g., when the flue gas temperature before the open-flame zone gas-water heat exchanger is 306℃) and process load variations. During low-load periods or periods of specific product production, the supply of waste heat from the flue gas is unstable.

[0004] From a system configuration perspective, the cooling roller circulating water system is equipped with a dedicated heat exchanger, and the circulating pump has a rated flow rate of 50 m³ / h. The system has accumulated relatively mature operating experience during its operation. In the existing process, the cooling roller circulating water, after heat exchange, must ensure a supply water temperature ≤ 60℃ to meet the roller cooling requirements. Simultaneously, the production line is equipped with a cooling roller circulating water storage tank to regulate the system's water temperature balance.

[0005] Currently, the industry commonly adopts a technology approach that uses the waste heat from the circulating water of the cooling rollers as an auxiliary heat source, transferring heat energy through a heat exchanger. During implementation, this technology requires close attention to the flow balance between the heat source and cold source sides, temperature control, and the stability of system operation.

[0006] When the waste heat recovery device for the cooling roller of the aluminum-zinc plating production line is in use, the connection between the connecting pipe and the fixed pipe is often not sealed properly due to vibration or thermal expansion and contraction, resulting in unstable connection and loose interface, which can easily cause media leakage. This not only affects the waste heat recovery efficiency, but may also cause environmental pollution around the equipment, increase maintenance frequency and safety risks. Utility Model Content

[0007] The purpose of this utility model is to provide a waste heat recovery device for the cooling roller of an aluminized zinc plating production line, which solves the problem that the connection between the connecting pipe and the fixed pipe is unstable during use, which easily leads to leakage at the connection.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a waste heat recovery device for cooling rollers in an aluminum-zinc plating production line, comprising a heat exchanger body, a mounting base fixedly connected to the right side of the heat exchanger body, a fixed pipe fixedly connected inside the mounting base, the fixed pipe being fixedly connected to the heat exchanger body, a connecting pipe inserted into the outside of the fixed pipe, a limiting block rotatably connected inside the mounting base, the limiting block being rotatably connected to the fixed pipe, a limiting sleeve fixedly connected to the side of the limiting block away from the mounting base, a positioning frame fixedly connected to the outside of the connecting pipe, and a limiting mechanism provided on the mounting base.

[0009] Preferably, a protrusion is fixedly connected to the outer side of the limiting block, and the protrusion is slidably connected to the mounting base. Through the design of the protrusion, the limiting block can play a limiting role.

[0010] Preferably, the limiting sleeve contacts the mounting base, the limiting sleeve is rotatably connected to the fixed tube, and the limiting sleeve is threadedly connected to the connecting tube. Through the design of the limiting sleeve, the connecting tube can be limited.

[0011] Preferably, the positioning frame contacts the limiting sleeve, and the positioning frame is slidably connected to the mounting base. Through the design of the positioning frame, it can play a positioning role for the connecting pipe.

[0012] Preferably, the limiting mechanism includes a mounting block, a slider is slidably connected inside the mounting block, a locking block is fixedly connected to the side of the slider near the limiting sleeve, a fixing rod is fixedly connected inside the mounting block, the fixing rod is slidably connected to the slider, and a spring is provided on the outside of the fixing rod, with both ends of the spring contacting the slider. Through the design of the limiting mechanism, the limiting sleeve can remain stable when limiting the connecting tube, thereby ensuring stability after the connecting tube and the fixing tube are inserted.

[0013] Preferably, the locking block is slidably connected to the mounting block and to the limiting sleeve. The design of the locking block can limit the movement of the limiting sleeve.

[0014] Preferably, a push block is fixedly connected to the side of the slider away from the mounting block. The push block contacts the mounting block, and the design of the push block allows for easy movement of the locking block.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. This utility model, by setting up components such as limiting blocks, limiting sleeves, and positioning frames, ensures that when the connecting pipe and the fixed pipe are inserted, the positioning frame accurately positions and guides the connecting pipe to ensure coaxial fit. After the rotating limiting sleeve engages with the threaded connection of the connecting pipe, the limiting sleeve forms a stable limit on the connecting pipe, so that the connection interface between the connecting pipe and the fixed pipe is tightly combined and maintains long-term stability. This effectively solves the problem of loose connection and easy loosening of the connecting pipe and the fixed pipe leading to interface leakage in the waste heat recovery device of the cooling roller in the aluminum zinc plating production line.

[0017] 2. This utility model, by setting up components such as sliders, locking blocks, and springs, compresses the spring when the locking block is pressed, and the slider moves with the locking block; after being released, the spring rebounds, pushing the slider to automatically slide the locking block into the limiting sleeve, forming a stable locking position on the limiting sleeve, so that the limiting sleeve and the connecting pipe are tightly fitted and not easy to loosen, ensuring that the limiting sleeve's limiting effect on the connecting pipe is stable and reliable, and effectively enhancing the vibration resistance of the connection part. Attached Figure Description

[0018] Figure 1 This is a perspective view of the overall structure of this utility model;

[0019] Figure 2 For the present utility model Figure 1 A partial three-dimensional structural diagram;

[0020] Figure 3 For the present utility model Figure 1 A partial structural front sectional view;

[0021] Figure 4 For the present utility model Figure 3 Enlarged view of section A in the diagram;

[0022] Figure 5 For the present utility model Figure 2 Enlarged view of section B in the diagram.

[0023] In the diagram: 1. Heat exchanger body; 2. Mounting base; 21. Fixed pipe; 22. Connecting pipe; 23. Limiting block; 24. Protrusion; 25. Limiting sleeve; 26. Positioning frame; 3. Limiting mechanism; 31. Mounting block; 32. Slider; 33. Locking block; 34. Fixed rod; 35. Spring; 36. Push block. Detailed Implementation

[0024] 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.

[0025] Please see Figure 1-5 A waste heat recovery device for cooling rollers in an aluminized zinc plating production line includes a heat exchanger body 1. A mounting base 2 is fixedly connected to the right side of the heat exchanger body 1. A fixing pipe 21 is fixedly connected inside the mounting base 2 and is fixedly connected to the heat exchanger body 1. A connecting pipe 22 is inserted into the outside of the fixing pipe 21. A limiting block 23 is rotatably connected inside the mounting base 2 and is rotatably connected to the fixing pipe 21. A protrusion 24 is fixedly connected to the outside of the limiting block 23 and is slidably connected to the mounting base 2. The protrusion 24, through its design, can limit the movement of the limiting block 23. This project utilizes the waste heat carried by the existing 50m³ / h circulating water (supply and return water temperature difference 10℃, water temperature 58 / 68℃) of the annealing furnace cooling rollers (estimated usable heat capacity 550kW, approximately 300kW during G550 production), which is then connected as a heat source to the heat source side of the newly installed 550kW heat exchanger body 1. The main body of the heat exchanger 1 is connected in parallel with the original cooling roller circulating water heat exchanger. The existing circulating pump on the heat source side is reused to ensure that the cooling roller supply water temperature is ≤60℃ after heat exchange to meet the cooling requirements. At the same time, hot water (as the heating medium) from the insulated water tank in the open flame area is introduced to the cold source side of the new heat exchanger main body 1, with a designed circulating water volume of 50m³ / h. Through heat exchange, the water temperature is raised from 45℃ to 55℃ to supplement the heat for process water such as alkaline washing. The system is dynamically regulated by electric regulating valves (2 on the heat source side and 1 on the cold source side) and temperature sensors: waste heat is used first to heat the process water, and other heat sources are switched when waste heat is insufficient; when the water temperature in the cooling roller storage tank exceeds 75℃, some high-temperature water is bypassed to cool down to 70℃, balancing waste heat utilization and equipment safety, and ultimately realizing the transfer of waste heat from the cooling roller circulating water to the process water supply.

[0026] Please see Figure 2-5 A limiting sleeve 25 is fixedly connected to the side of the limiting block 23 away from the mounting base 2. The limiting sleeve 25 is in contact with the mounting base 2 and is rotatably connected to the fixed tube 21. The limiting sleeve 25 is connected to the connecting tube 22 by a thread. The design of the limiting sleeve 25 can limit the connecting tube 22. A positioning frame 26 is fixedly connected to the outside of the connecting tube 22. The positioning frame 26 is in contact with the limiting sleeve 25 and is slidably connected to the mounting base 2. The design of the positioning frame 26 can position the connecting tube 22. A limiting mechanism 3 is provided on the mounting base 2.

[0027] Please see Figure 2-5The limiting mechanism 3 includes a mounting block 31, a slider 32 is slidably connected inside the mounting block 31, a locking block 33 is fixedly connected to the side of the slider 32 near the limiting sleeve 25, the locking block 33 is slidably connected to the mounting block 31, and the locking block 33 is slidably connected to the limiting sleeve 25. Through the design of the locking block 33, the limiting sleeve 25 can be limited. A fixing rod 34 is fixedly connected inside the mounting block 31, the fixing rod 34 is slidably connected to the slider 32, and a spring 35 is provided on the outside of the fixing rod 34. The two ends of the spring 35 are respectively in contact with the slider 32. A push block 36 is fixedly connected to the side of the slider 32 away from the mounting block 31, and the push block 36 is in contact with the mounting block 31. Through the design of the push block 36, the locking block 33 can be easily moved. Through the design of the limiting mechanism 3, the limiting sleeve 25 can be kept stable when limiting the connecting tube 22, so that the connecting tube 22 and the fixing tube 21 remain stable after insertion.

[0028] The specific implementation process of this utility model is as follows: In use, by moving the push block 36 away from the limiting sleeve 25, the push block 36 drives the slider 32 to slide on the fixed rod 34, so that the slider 32 squeezes the spring 35 and drives the locking block 33 to move, so that the locking block 33 slides out of the limiting sleeve 25, thereby releasing the limitation of the limiting sleeve 25; the connecting pipe 22 is inserted into the fixed pipe 21, so that the connecting pipe 22 drives the positioning frame 26 to slide into the mounting base 2; then the limiting sleeve 25 is rotated, so that the limiting sleeve 25 and the connecting pipe 22 have a threaded movement, thereby so that the limiting sleeve 25 plays a limiting role on the connecting pipe 22, and the connecting pipe 22 remains stable after being inserted into the fixed pipe 21.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery device for a cooling roll of an aluminum-zinc plating line, comprising a heat exchanger body (1), characterized in that: A mounting base (2) is fixedly connected to the right side of the heat exchanger body (1). A fixing pipe (21) is fixedly connected inside the mounting base (2). The fixing pipe (21) is fixedly connected to the heat exchanger body (1). A connecting pipe (22) is inserted into the outside of the fixing pipe (21). A limiting block (23) is rotatably connected inside the mounting base (2). The limiting block (23) is rotatably connected to the fixing pipe (21). A limiting sleeve (25) is fixedly connected to the side of the limiting block (23) away from the mounting base (2). A positioning frame (26) is fixedly connected to the outside of the connecting pipe (22). A limiting mechanism (3) is provided on the mounting base (2).

2. The waste heat recovery device for a cooling roll of an Al-Zn alloy plating line according to claim 1, characterized in that: The outer side of the limiting block (23) is fixedly connected to a protrusion (24), and the protrusion (24) is slidably connected to the mounting base (2).

3. The waste heat recovery device for a cooling roll of an Al-Zn alloy plating line according to claim 1, characterized in that: The limiting sleeve (25) contacts the mounting base (2), the limiting sleeve (25) is rotatably connected to the fixing tube (21), and the limiting sleeve (25) is threadedly connected to the connecting tube (22).

4. The waste heat recovery device for a cooling roll of an Al-Zn alloy plating line according to claim 1, characterized in that: The positioning frame (26) contacts the limiting sleeve (25), and the positioning frame (26) is slidably connected to the mounting base (2).

5. The waste heat recovery device for a cooling roll of an Al-Zn alloy plating line according to claim 1, characterized in that: The limiting mechanism (3) includes a mounting block (31), a slider (32) is slidably connected inside the mounting block (31), a locking block (33) is fixedly connected to the side of the slider (32) near the limiting sleeve (25), a fixing rod (34) is fixedly connected inside the mounting block (31), the fixing rod (34) is slidably connected to the slider (32), and a spring (35) is provided on the outside of the fixing rod (34), with the two ends of the spring (35) respectively contacting the slider (32).

6. The waste heat recovery device for a cooling roll of an Al-Zn alloy plating line according to claim 5, characterized in that: The card block (33) is slidably connected to the mounting block (31), and the card block (33) is slidably connected to the limiting sleeve (25).

7. The waste heat recovery device for a cooling roll of an Al-Zn alloy plating line according to claim 5, characterized in that: A push block (36) is fixedly connected to the side of the slider (32) away from the mounting block (31), and the push block (36) is in contact with the mounting block (31).

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