Tunnel type metal plate strip composite hot rolling equipment

Abstract

The utility model discloses tunnel type metal plate strip composite hot rolling equipment which comprises a protection tunnel, a rolling mill and a control panel, the front end face and the rear end face of the protection tunnel are sealed, the front end face and the rear end face of the protection tunnel are provided with a feeding port and a discharging port respectively, a high-potential contact, a flame projector, a deviation rectification overlapping mechanism, an air inlet pipe I and an air inlet pipe II are arranged in the protection tunnel, the flame projector is communicated with a fuel gas source, and the deviation rectification overlapping mechanism is communicated with the fuel gas source. The flame thrower seals the feed port and the discharge port, the gas inlet pipe I and the gas inlet pipe II are provided with a control valve I and a control valve II respectively, the gas inlet pipe I and the gas inlet pipe II are communicated with an inert gas source and a hydrogen source respectively, a high-potential contact is in contact with a substrate strip, and a roller of the rolling mill is in contact with a low-potential contact. And the high-potential contact and the low-potential contact are connected with a heating power supply. Compared with the prior art, the production of oxides can be effectively reduced, the heating efficiency is better, and continuous hot rolling compounding can be realized.

Description

Technical Field

[0001] This utility model belongs to the field of metal processing, specifically relating to tunnel-type metal plate and strip composite hot rolling equipment. Background Technology

[0002] Metal composite sheets and strips are multilayer materials formed by the interfacial metallurgical bonding of two or more different metals through special processes (such as explosive bonding, rolling bonding, etc.). Their core characteristic is that while retaining the advantages of a single metal, they compensate for its performance shortcomings. For example, the base metal provides mechanical strength, while the cladding metal enhances corrosion resistance, thereby reducing the cost of using precious metals. Currently, in the process of hot rolling to composite metal sheets and strips, the sheet interface is prone to oxidation, forming a brittle and hard structure, which affects the bonding strength and composite effect. Furthermore, heating the metal sheets and strips in furnaces (such as gas furnaces or resistance furnaces) has poor heating efficiency, making high-speed continuous rolling difficult and limiting production efficiency. Utility Model Content

[0003] The purpose of this invention is to overcome the problems of interface oxides and heating efficiency of the strip in the existing hot rolling composite process of metal sheet and strip, and to provide a tunnel-type hot rolling equipment for metal sheet and strip composite that can effectively reduce oxide generation, has better heating efficiency, and can realize continuous hot rolling composite.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a tunnel-type composite hot rolling equipment for metal sheet and strip, including a front and rear sealed protective tunnel, a rolling mill, and a control panel. The front and rear ends of the protective tunnel are respectively provided with a feed inlet and a discharge outlet for the sheet and strip. An uncoiling machine is provided in front of the protective tunnel, and the rolling mill is located at the discharge outlet behind the protective tunnel. A coiling machine is provided behind the rolling mill. The metal sheet and strip establish tension through the uncoiling machine and the coiling machine. The protective tunnel is equipped with a high-potential contact, a flamethrower, a correction and overlapping mechanism, an air inlet pipe I, and an air inlet pipe. II. The high-potential contact is located in front of the correction and superposition mechanism. The flamethrower is connected to the gas source. The flamethrower seals the feed inlet and outlet. Control valve I and control valve II are respectively installed on the air inlet pipe I and air inlet pipe II. The air inlet pipe I and air inlet pipe II are respectively connected to the inert gas source and the hydrogen source. The high-potential contact is in contact with the base plate strip. The rolling mill roll is in contact with a low-potential contact. The high-potential contact and the low-potential contact are connected to a heating power source. The unwinding machine, winding machine, rolling mill, flamethrower, control valve I, control valve II and heating power source are connected to the control panel.

[0005] Optionally, the correction and overlapping mechanism consists of a guide roller and an overlapping table. The overlapping table is provided with an overlapping component and a correction component. The guide roller guides the plate to the overlapping table, and the overlapping component and the correction component correct the overlapping plate.

[0006] Optionally, the heating power supply has a supply voltage of 20~25V and a supply current of 10~12.5KA.

[0007] Optionally, a cooling tunnel is provided between the rolling mill and the winding machine.

[0008] Optionally, the distance between the discharge port and the rolling mill rolls is 2~8cm.

[0009] Optionally, a movable door is provided on one side of the protective tunnel.

[0010] The method of use of this utility model is as follows: Two or more metal coils are placed on an uncoiling machine, and the metal strip is pulled through the feed port into the protective tunnel, so that the base strip is continuously in contact with the high-potential contact. The metal strip in the protective tunnel is pulled through the correction and stacking mechanism. Then, the corrected and stacked metal strip is pulled out of the protective tunnel through the discharge port and contacts the rolls of the rolling mill. Control valve I and control valve II are activated to continuously inject inert gas and hydrogen into the protective tunnel. After a certain period of time, the flamethrower is activated to continuously spray flames at the feed port and discharge port to seal the feed port and discharge port. Then, the heating power supply is turned on, and the heating power supply is used to energize the metal strip through the high-potential contact and the low-potential contact (low voltage and high current) to heat the metal strip. Finally, the rolling mill is started, and the metal strip heated by the rolling mill is pulled to establish a connection with the coiling machine. The uncoiling machine and the coiling machine are used to establish tension on the metal strip to achieve continuous hot rolling composite.

[0011] The principle of this invention is as follows: First, the strip to be heated is placed in a relatively sealed tunnel. Inert gas and hydrogen are continuously injected into the tunnel, causing it to fill with these gases. The inert gas and hydrogen then escape through gaps in the tunnel, forming a positive pressure barrier to prevent oxygen-containing air from entering. Simultaneously, the inlet and outlet of the tunnel are sealed with a continuous flame from a flame burner, further preventing oxygen-containing air from entering. Additionally, the hydrogen filling the tunnel can reduce oxides on the surface of the strip. This reduction is accelerated at high temperatures, thus reducing oxide formation at various points. Second, high and low potential contacts are used to heat the metal strip. Because the strip... The strip moves forward continuously. The substrate strip near the high potential is preheated. After preheating, the substrate strip moves forward and passes through the correction and stacking mechanism to overlap with other strips to form a pre-rolled strip. At this time, the resistance increases and the electron density increases, and the temperature of the pre-rolled strip rises further. Then the pre-rolled strip continues to move forward and contacts the rolls. At this time, the resistance increases further and the electron density increases further. The temperature of the pre-rolled strip rises to a suitable value and is then rolled into a composite strip. Through this heating method, the temperature rise is relatively gradual and the heat loss is small, which can achieve good heating efficiency and does not require high equipment. In addition, using low voltage and high current to heat the composite material can effectively improve heating efficiency, optimize material properties, reduce costs, reduce arc radiation, and improve safety, and the operation is simple.

[0012] Compared with the prior art, the present invention has at least the following beneficial effects: the present invention can effectively reduce oxide generation, has better heating efficiency, and can realize continuous hot rolling composite. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] The following components are labeled as follows: 1. Protective tunnel; 2. Rolling mill; 3. Feed inlet; 4. Discharge outlet; 5. Unwinder; 6. Winding machine; 7. High-potential contact; 8. Flamethrower; 9. Correction and overlapping mechanism; 10. Air inlet pipe I; 11. Air inlet pipe II; 12. Low-potential contact; 13. Cooling tunnel. Detailed Implementation

[0015] Example 1, in conjunction with the following Figure 1 Further description of this utility model: A tunnel-type composite hot rolling mill for metal sheet and strip includes a front and rear sealed protective tunnel 1, a rolling mill 2, and a control panel. The front and rear ends of the protective tunnel are respectively provided with an inlet 3 and an outlet 4 for the entry and exit of the sheet and strip. An uncoiling machine 5 is located in front of the protective tunnel, capable of holding various metal coils at intervals. The rolling mill is located at the outlet behind the protective tunnel, with a roller spacing of 2-8 cm between the outlet and the rolling mill. A coiling machine 6 is located behind the rolling mill. The metal sheet and strip establish tension through the uncoiling and coiling machines. The protective tunnel is equipped with a high-potential contact 7, a flamethrower 8, a correction and overlapping mechanism 9, an air inlet pipe I 10, and an air inlet pipe II 11. The potential contact is located in front of the correction and superposition mechanism. The flamethrower is connected to the gas source. The flamethrower seals the feed inlet and outlet. Control valve I and control valve II are respectively installed on the air inlet pipe I and air inlet pipe II. The air inlet pipe I and air inlet pipe II are respectively connected to the inert gas source and the hydrogen source. The high potential contact is in sliding contact with the base plate strip. The rolling mill roll is in contact with a low potential contact 12. The high potential contact and the low potential contact are connected to a heating power supply. The heating power supply has its own on / off switch. The power supply voltage of the heating power supply is 20~25V and the power supply current is 10~12.5KA. The unwinding machine, winding machine, rolling mill, flamethrower, control valve I, control valve II and heating power supply are connected to the control panel.

[0016] There are many forms of belt alignment and overlapping mechanisms. To facilitate understanding of the alignment and overlapping mechanism, one form is described. The alignment and overlapping mechanism consists of guide rollers and overlapping table. The overlapping table is equipped with overlapping components and alignment components. The guide rollers guide the belt to the overlapping table, and the overlapping components and alignment components align and overlap the belt.

[0017] Since the temperature of the composite strip coming out of the rolling mill is high, it is necessary to appropriately reduce its temperature in order to facilitate safe subsequent winding. Therefore, a cooling tunnel 13 is provided between the rolling mill and the winding machine.

[0018] To facilitate manual adjustment of components inside the protective tunnel, a movable door is installed on one side of the protective tunnel, and the joint between the movable door and the protective tunnel is sealed.

[0019] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tunnel type composite hot rolling equipment of metal plate strip, comprising a closed protective tunnel (1) at the front and rear ends, a rolling mill (2) and a control panel, a feeding port (3) and a discharging port (4) for the plate strip to enter and exit are respectively arranged at the front and rear end faces of the protective tunnel, an unwinding machine (5) is arranged at the front of the protective tunnel, the rolling mill is located at the discharging port at the rear of the protective tunnel, a winding machine (6) is arranged at the rear of the rolling mill, and the metal plate strip passes through the unwinding machine and the winding machine to establish tension, characterized in that: The protection tunnel is provided with a high potential contact (7), a fire sprayer (8), a deviation rectifying and laminating mechanism (9), an air inlet pipe I (10) and an air inlet pipe II (11). The high potential contact is located in front of the deviation rectifying and laminating mechanism. The fire sprayer is connected with a gas source. The fire sprayer is sealed with an inlet and an outlet. The air inlet pipe I and the air inlet pipe II are respectively provided with a control valve I and a control valve II. The air inlet pipe I and the air inlet pipe II are respectively connected with an inert gas source and a hydrogen source. The high potential contact is in contact with a substrate strip. The roller of the rolling mill is in contact with a low potential contact (12). The high potential contact and the low potential contact are connected with a heating power supply. The unwinding machine, the winding machine, the rolling mill, the fire sprayer, the control valve I, the control valve II and the heating power supply are connected with a control panel. ​ 2. The tunnel-type strip-cast combined hot rolling apparatus according to claim 1, characterized by: The deviation rectifying and laminating mechanism is composed of a guide roller and a laminating table. The laminating table is provided with a laminating piece and a deviation rectifying piece. The guide roller guides the substrate strip to the laminating table. The laminating piece and the deviation rectifying piece rectify and laminate the substrate strip.

3. The tunnel-type strip-cast combined hot rolling apparatus according to claim 1, characterized in that: The voltage of the heating power supply is 20-25V. The current of the heating power supply is 10-12.5KA.

4. The tunnel-type strip-cast combined hot rolling apparatus according to claim 1, characterized by: A cooling tunnel (13) is arranged between the rolling mill and the winding machine.

5. The tunnel-type strip-cast combined hot rolling apparatus according to claim 1, characterized by: The distance between the outlet and the roller of the rolling mill is 2-8cm.

6. The tunnel-type strip-cast combined hot rolling apparatus according to claim 1, characterized by: A movable door is arranged on one side of the protection tunnel.

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