A furnace door oil pipe cooling protection device and a cooling method thereof

Abstract

The application discloses a furnace door oil pipe cooling protection device, which comprises a first hydraulic hard pipe (2) and a second hydraulic hard pipe (3) connected with a furnace door lifting oil cylinder (1), the oil outlet end of the first hydraulic hard pipe (2) is connected with a rodless cavity of the furnace door lifting oil cylinder (1), and the oil outlet end of the second hydraulic hard pipe (3) is connected with a rod cavity of the furnace door lifting oil cylinder (1); the furnace door lifting oil cylinder (1) is further connected with a cooling water inlet hard pipe (4) and a cooling water return hard pipe (5) respectively, the cooling water inlet hard pipe (4) is sleeved outside the first hydraulic hard pipe (2), the cooling water return hard pipe (5) is sleeved outside the second hydraulic hard pipe (3), and a mutual communication cross pipe (6) is connected between the cooling water inlet hard pipe (4) and the cooling water return hard pipe (5). The furnace door lifting oil cylinder oil pipe explosion phenomenon is eliminated, and the production efficiency and the production safety are improved.

Description

Technical Field

[0001] This invention belongs to the technical field of furnace door oil pipe cooling equipment, and particularly relates to a furnace door oil pipe cooling protection device and its cooling method. Background Technology

[0002] In the iron and steel smelting industry, electric arc furnaces (EAFs) have become one of the core pieces of equipment for producing special steels and high-alloy steels due to their advantages such as flexible smelting processes and strong adaptability to raw materials. To reduce steel consumption and improve the precision control of the smelting process, many EAF manufacturers have installed furnace door devices at the slag outlet. This allows operators to frequently open the furnace door according to process requirements during smelting, enabling precise control of the smelting state inside the furnace and effectively reducing steel waste.

[0003] However, during furnace door opening, a large amount of high-temperature steel slag easily overflows from the furnace, and some of the slag comes into contact with the inlet and return oil pipes of the furnace door lifting cylinder in the form of high-speed splashes. This high-temperature steel slag can reach temperatures of thousands of degrees Celsius, causing severe thermal shock and physical wear to the inlet and return oil pipes. Currently, most electric furnaces use only conventional protective structures for the inlet and return oil pipes of the furnace door lifting cylinder, and some even lack dedicated cooling protection devices. Under the continuous corrosion of high-temperature steel slag, the material properties of the oil pipes deteriorate rapidly, the pipe wall thickness decreases continuously, and eventually leads to oil pipe rupture. After an oil pipe ruptures, not only will it cause hydraulic oil leakage and trigger equipment hydraulic system failure, but it also requires immediate furnace shutdown for repair and replacement. During the shutdown and repair process, the electric furnace is at a high temperature, and maintenance personnel face multiple safety risks such as burns and mechanical injuries. At the same time, the shutdown disrupts the normal production rhythm, causing production interruptions, significantly reducing production efficiency, increasing production costs, and seriously affecting smooth production operations. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of existing electric furnace door oil pipes being susceptible to high-temperature corrosion, frequent bursting failures, time-consuming and labor-intensive maintenance, and significant safety hazards. It provides a furnace door oil pipe cooling and protection device to eliminate the phenomenon of furnace door lifting cylinder oil pipe bursting, thereby improving production efficiency and production safety.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A furnace door oil pipe cooling protection device includes a first hydraulic hard pipe and a second hydraulic hard pipe connected to a furnace door lifting cylinder. The oil outlet end of the first hydraulic hard pipe is connected to the rodless chamber of the furnace door lifting cylinder, and the oil outlet end of the second hydraulic hard pipe is connected to the rod chamber of the furnace door lifting cylinder, so as to supply oil to the rodless chamber or the rod chamber of the furnace door lifting cylinder respectively. The furnace door lifting cylinder is also connected to a cooling water inlet hard pipe and a cooling water return hard pipe. The cooling water inlet hard pipe is sleeved outside the first hydraulic hard pipe, and the cooling water return hard pipe is sleeved outside the second hydraulic hard pipe. There is an interconnecting horizontal pipe between the cooling water inlet hard pipe and the cooling water return hard pipe.

[0006] Furthermore, the first hydraulic rigid pipe is connected to the first hydraulic hose via a first connector, the second hydraulic rigid pipe is connected to the second hydraulic hose via a second connector, and the first hydraulic hose and the second hydraulic hose are then respectively connected to an external oil supply system.

[0007] Furthermore, the cooling water inlet hard pipe is connected to the cooling water inlet hose through a cooling water inlet pipe joint, and the cooling water return hard pipe is connected to the cooling water return hose through a cooling water return pipe joint. The cooling water inlet hose and the cooling water return hose are then connected to the external cooling water supply system respectively.

[0008] Furthermore, the cooling water inlet rigid pipe, cooling water inlet pipe joint, and cooling water inlet hose constitute a cooling water inlet pipeline device, and the first hydraulic rigid pipe, the first joint, and the first hydraulic hose are all located inside the cooling water inlet pipeline device.

[0009] Furthermore, the cooling return water rigid pipe, cooling return water pipe joint, and cooling return water hose constitute a cooling return water pipeline device, and the second hydraulic rigid pipe, the second joint, and the second hydraulic hose are all located within the cooling return water pipeline device.

[0010] Furthermore, the first hydraulic hard pipe and the cooling water inlet hard pipe are on the same axis.

[0011] Furthermore, the second hydraulic hard pipe and the cold water return hard pipe are on the same axis.

[0012] To further achieve the objective of this invention, a method for cooling the furnace door oil pipe is also provided, using the aforementioned furnace door oil pipe cooling protection device. The specific steps are as follows: S1, connect the first hydraulic hard pipe to the oil inlet of the rodless chamber of the furnace door lifting cylinder, and connect the second hydraulic hard pipe to the oil inlet of the rod chamber of the furnace door lifting cylinder. The hydraulic hard pipes supply oil to the chambers of the furnace door lifting cylinder respectively. S2, connect the cooling water inlet hard pipe to the rodless chamber oil inlet of the furnace door lifting cylinder, and the cooling water inlet hard pipe covers the first hydraulic hard pipe; S3, then connect the cooling return water hard pipe to the rod chamber oil inlet of the furnace door lifting cylinder, and the cooling return water hard pipe covers the second hydraulic hard pipe. S4. When the oil supply starts, cooling water is introduced into the cooling water inlet hard pipe, and the cooling water cools the first hydraulic hard pipe inside the pipe. S5. At the same time, a portion of the cooling water flows through the interconnecting horizontal pipe into the cooling return water hard pipe to cool the second hydraulic hard pipe inside the pipe. This cycle continues until the oil supply ends.

[0013] Compared with the prior art, the advantages of the technical solution of the present invention are as follows: (1) The present invention can effectively protect the furnace door lifting oil pipe, avoid production shutdown caused by the hot oil pipe being burned by steel slag, and greatly reduce safety hazards; (2) The present invention can effectively reduce the hydraulic oil temperature of the furnace door lifting cylinder, improve the service life of the cylinder seal, and thus improve the service life of the cylinder. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the furnace door oil pipe cooling protection device of the present invention. Detailed Implementation Example

[0015] To make the present invention clearer, the following description, in conjunction with the accompanying drawings, further illustrates a furnace door oil pipe cooling protection device and its cooling method. The specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0016] See Figure 1 A furnace door oil pipe cooling protection device, characterized in that: It includes a first hydraulic hard pipe 2 and a second hydraulic hard pipe 3 connected to the furnace door lifting cylinder 1. The oil outlet end of the first hydraulic hard pipe 2 is connected to the rodless chamber of the furnace door lifting cylinder 1, and the oil outlet end of the second hydraulic hard pipe 3 is connected to the rod chamber of the furnace door lifting cylinder 1. The first hydraulic rigid pipe 2 is connected to the first hydraulic hose 8 through the first connector 7, and the second hydraulic rigid pipe 3 is connected to the second hydraulic hose 10 through the second connector 9. The first hydraulic hose 8 and the second hydraulic hose 10 are then connected to the external oil supply system respectively, so as to supply oil to the rodless chamber or rod chamber of the furnace door lifting cylinder respectively. The furnace door lifting cylinder 1 is also connected to a cooling water inlet hard pipe 4 and a cooling water return hard pipe 5 respectively. The cooling water inlet hard pipe 4 is sleeved outside the first hydraulic hard pipe 2, and the cooling water return hard pipe 5 is sleeved outside the second hydraulic hard pipe 3. There is an interconnecting horizontal pipe 6 between the cooling water inlet hard pipe 4 and the cooling water return hard pipe 5. The cooling water inlet rigid pipe 4 is connected to the cooling water inlet hose 12 through the cooling water inlet pipe joint 11 to form a cooling water inlet pipeline device. The first hydraulic rigid pipe 2, the first joint 7 and the first hydraulic hose 8 are all located in the cooling water inlet pipeline device. The cooling return water rigid pipe 5 is connected to the cooling return water hose 14 through the cooling return water pipe joint 13 to form a cooling return water pipeline device. The second hydraulic rigid pipe 3, the second joint 9, and the second hydraulic hose 10 are all located in the cooling return water pipeline device. The cooling water inlet hose 12 and the cooling water return hose 14 are then connected to the external cooling water supply system.

[0017] During operation, cooling water flows through the cooling inlet hard pipe 4 to cool the first hydraulic hard pipe 2 inside, and then flows through the interconnecting horizontal pipe 6 to the cooling return hard pipe 5 to cool the second hydraulic hard pipe 3 inside. This achieves cooling treatment of the oil pipes during oil supply, controls the temperature of the hydraulic oil in the pipes, prevents the oil pipes from bursting due to high temperature, maintains the normal and stable operation of oil supply, reduces production safety hazards, and improves production efficiency.

[0018] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A furnace door oil pipe cooling protection device, characterized in that: It includes a first hydraulic hard pipe (2) and a second hydraulic hard pipe (3) connected to the furnace door lifting cylinder (1). The oil outlet end of the first hydraulic hard pipe (2) is connected to the rodless cavity of the furnace door lifting cylinder (1), and the oil outlet end of the second hydraulic hard pipe (3) is connected to the rod cavity of the furnace door lifting cylinder (1). The furnace door lifting cylinder (1) is also connected to a cooling water inlet hard pipe (4) and a cooling water return hard pipe (5). The cooling water inlet hard pipe (4) is sleeved outside the first hydraulic hard pipe (2), and the cooling water return hard pipe (5) is sleeved outside the second hydraulic hard pipe (3). There is an interconnecting horizontal pipe (6) between the cooling water inlet hard pipe (4) and the cooling water return hard pipe (5).

2. The furnace door oil pipe cooling protection device according to claim 1, characterized in that: The first hydraulic hard pipe (2) is connected to the first hydraulic hose (8) through the first connector (7), and the second hydraulic hard pipe (3) is connected to the second hydraulic hose (10) through the second connector (9). The first hydraulic hose (8) and the second hydraulic hose (10) are then connected to the external oil supply system respectively.

3. The furnace door oil pipe cooling protection device according to claim 2, characterized in that: The cooling water inlet hard pipe (4) is connected to the cooling water inlet hose (12) through the cooling water inlet pipe joint (11), and the cooling water return hard pipe (5) is connected to the cooling water return hose (14) through the cooling water return pipe joint (13). The cooling water inlet hose (12) and the cooling water return hose (14) are then connected to the external cooling water supply system respectively.

4. The furnace door oil pipe cooling protection device according to claim 3, characterized in that: The cooling water inlet hard pipe (4), cooling water inlet pipe joint (11) and cooling water inlet hose (12) constitute a cooling water inlet pipeline device. The first hydraulic hard pipe (2), the first joint (7) and the first hydraulic hose (8) are all located in the cooling water inlet pipeline device.

5. The furnace door oil pipe cooling protection device according to claim 3, characterized in that: The cooling return water hard pipe (5), cooling return water pipe joint (13) and cooling return water hose (14) form a cooling return water pipeline device. The second hydraulic hard pipe (3), the second joint (9) and the second hydraulic hose (10) are all located in the cooling return water pipeline device.

6. The furnace door oil pipe cooling protection device according to any one of claims 1 to 5, characterized in that: The first hydraulic hard pipe (2) and the cooling water inlet hard pipe (4) are on the same axis.

7. The furnace door oil pipe cooling protection device according to any one of claims 1 to 5, characterized in that: The second hydraulic hard pipe (3) and the cold water return hard pipe (5) are on the same axis.

8. A cooling method for the furnace door oil pipe cooling protection device as described in claim 1, characterized in that: S1, connect the first hydraulic hard pipe (2) to the rodless cavity oil inlet of the furnace door lifting cylinder (1), and connect the second hydraulic hard pipe (3) to the rod cavity oil inlet of the furnace door lifting cylinder (1). The hydraulic hard pipes supply oil to the cavity of the furnace door lifting cylinder respectively. S2, connect the cooling water inlet hard pipe (4) to the rodless chamber oil inlet of the furnace door lifting cylinder (1), and the cooling water inlet hard pipe (4) covers the first hydraulic hard pipe (2); S3, then connect the cooling return water hard pipe (5) to the rod chamber oil inlet of the furnace door lifting cylinder (1), and the cooling return water hard pipe (5) covers the second hydraulic hard pipe (3). S4, when the oil supply starts, cooling water is introduced into the cooling water inlet hard pipe (4), and the cooling water cools the first hydraulic hard pipe (2) inside the pipe. S5. At the same time, a portion of the cooling water flows through the interconnecting horizontal pipe (6) into the cooling return water hard pipe (5) to cool the second hydraulic hard pipe (3) inside the pipe. This cycle continues until the oil supply ends.

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