Device for preventing temperature jump of bearing bush of air blower

Abstract

The utility model relates to the technical field of stable operation of blast furnace blowers in steel plants, in particular to a device for preventing temperature jump of a bearing bush of a blower. The device comprises an air blower bearing bush supporting an air blower shaft to rotate, three temperature measuring holes are additionally formed in the air blower bearing bush, three sets of temperature sensing thermocouples are additionally arranged, and each temperature sensing thermocouple is connected with a temperature sensing thermocouple wire, a connector bar and a transmission wire and is connected with a plc control system. And the temperature sensing thermocouple is fixedly mounted by a fixing screw. Three groups of temperature sensing thermal resistors are added to collect temperature signals at the same time, when the temperature signals of one group of thermocouples exceed a specified alarm value, the control system does not act, and when the temperature signals of more than or equal to two groups of thermocouples exceed the specified alarm value, the plc control system judges that the signal data is true and controls the air blower to trip. A large amount of economic loss caused by misoperation of a control system due to faults of a single thermocouple, a wire and a connector bar is avoided, the fault risk is reduced, and the probability of misoperation of equipment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of stable operation of blast furnace blowers in steel plants, namely a device for preventing the temperature of the bearing bush of the blower from jumping Background Art

[0002] During the production process of the blast furnace, it is necessary for the blast furnace blower to operate stably to provide air with stable pressure and flow for the blast furnace. After being heated by the hot blast stove of the blast furnace, the air is blown into the lower tuyeres of the blast furnace. At high temperatures, the carbon in the coke reacts with the oxygen in the blown air to generate a combustion reaction. During the upward movement in the furnace, carbon monoxide and hydrogen generated remove the oxygen in the iron ore through a reduction reaction, thereby obtaining iron by reduction. The molten iron produced is discharged from the iron notch. After the blast furnace blower trips, the mixture of coke, iron ore, etc. falls, blocking the lower tuyeres, causing an emergency shutdown of the blast furnace and an interruption in production. The bearing bush of the blast furnace blower stops due to the aging of spare parts and the friction heat generated between the bearing bush of the blower and the blower shaft, affecting the production of the blast furnace and even causing safety accidents. Content of the Utility Model

[0003] The purpose of the utility model is to provide a device for preventing the temperature of the bearing bush of the blower from jumping, which is efficient, safe and can prevent misoperation caused by the temperature jump of the bearing bush of the blower in view of the above deficiencies.

[0004] The technical solution of the utility model is: a device for preventing the temperature of the bearing bush of the blower from jumping, which is characterized by including a bearing bush of the blower shaft that supports the rotation of the blower shaft. Three temperature measurement holes are added at the bearing bush of the blower shaft, and three groups of temperature-sensitive thermocouples are added. Each temperature-sensitive thermocouple is connected to a temperature-sensitive thermocouple wire, a wiring row, a transmission wire and is connected to a plc control system. The temperature-sensitive thermocouple is fixedly installed by a fixing screw.

[0005] The embodiments of the utility model have the following beneficial effects: 1. The bearing bush of the blower unit of the blast furnace is transformed. On the premise that the babbit alloy, overall dimensions and strength of the bearing bush are not changed, three groups of temperature-sensitive thermal resistors collect temperature signals at the same time. When the temperature signal of one group of thermocouples exceeds the specified alarm value, the control system does not act. When the temperature signals of two or more groups of thermocouples exceed the specified alarm value, the plc control system judges that the signal data is true and controls the blower to trip, avoiding the failure of a single thermocouple, wire and wiring row, causing misoperation of the control system and a large amount of economic losses, and reducing the risk of failure. 2. The transformation difficulty is small, and the bearing bush can be machined on the original bearing bush body. 3. The operation difficulty of operators and maintenance personnel is reduced, and the probability of equipment misoperation is reduced.

[0006] The embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Description of the Drawings

[0007] Figure 1This is the structural schematic diagram of the present utility model.

[0008] Figure 2 is Figure 1 the structural schematic diagram along the A-A section. Specific embodiments

[0009] Refer to Figure 1 and 2 for the names of the components as follows: blower bearing 1, temperature-sensing thermocouple 2, temperature-sensing thermocouple wire 3, wiring terminal 4, transmission wire 5, PLC control system 6, blower shaft 7, and fixing screw 8.

[0010] Refer to Figure 1 and 2 for the device to prevent the temperature of the blower bearing from jumping, which includes the blower bearing 1 that supports the rotation of the blower shaft 7. Three temperature-measuring holes are added at the blower bearing 1, and three groups of temperature-sensing thermocouples 2 are added. Due to the friction between the lubricating oil and the blower bearing 1 and the blower shaft 7, a large amount of heat is generated and measured by the temperature-sensing thermocouples 2. Each temperature-sensing thermocouple 2 is connected to a temperature-sensing thermocouple wire 3, a wiring terminal 4, a transmission wire 5 and is connected to the PLC control system 6 to monitor whether the bearing is operating normally. The temperature-sensing thermocouples 2 are fixedly installed by fixing screws 8.

[0011] By processing the installation positions of three groups of temperature-sensing thermocouples 2 on the original blower bearing 1 and fixedly installing them with fixing screws 8, the temperature-measuring signals are connected to the control system 6 through the temperature-sensing thermocouple wires 3, the wiring terminals 4 and the transmission wires 5. When any two of the three groups of temperature-sensing thermocouples 2 alarm for temperature through the logical judgment of the PLC control system 6, the signal is true, thus avoiding the purpose of the tripping accident of the blast furnace blower caused by the failures of components such as the temperature-sensing thermocouples 2, the temperature-sensing thermocouple wires 3, the wiring terminals 4, and the transmission wires 5.

[0012] Increase the number of temperature-sensing thermocouples 2 of the blower bearing 1. Through the logical judgment of the control system, establish the "AND" relationship of the data of each temperature-measuring point. When the values of two temperature-measuring points exceed the specified value, the system determines that the measurement result is true and the control program acts. When the value of a certain temperature-measuring point exceeds the specified value, the system determines that the measurement result is false and the control program does not act, thereby reducing the probability of misoperation caused by equipment failures and improving the stability of the system.

[0013] The above description is only the specific embodiments of the present utility model, and various examples do not constitute a limitation to the essential content of the present utility model.

Claims

1. A device for preventing the temperature jump of the blower bearing, characterized in that The invention comprises a blower bearing (1) for supporting the rotation of a blower shaft (7), three temperature measuring holes are added to the blower bearing (1), three groups of temperature-sensing thermocouples (2) are added, and each temperature-sensing thermocouple (2) is connected to a temperature-sensing thermocouple wire (3), a terminal block (4), a transmission wire (5), and is connected to a PLC control system (6).

2. The device for preventing the temperature jump of the blower bearing according to claim 1, characterized in that The temperature sensing thermocouple (2) is fixedly installed by a fixing screw (8).

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