Double-station LF furnace electrode rotating mechanism locking device and control method

Abstract

The invention relates to a double-station LF furnace electrode locking device, which comprises a locking device, the locking device comprises a supporting seat, a locking hydraulic cylinder, a positioning shaft and a guide hole, the guide hole is fixedly connected with a base, the locking hydraulic cylinder is fixed on the supporting seat, the supporting seat is fixedly connected with the base, the positioning shaft is telescopically arranged in the supporting seat, and the positioning shaft is fixedly connected with the base. A piston rod of the locking hydraulic cylinder is axially connected with the positioning shaft, a locking hole is formed in the rotating mechanism, and the piston rod of the locking hydraulic cylinder drives the positioning shaft to penetrate through the guide hole to be inserted into the locking hole for locking and positioning. The locking device has the advantages that the first locking hole and the second locking hole are welded to the rotating mechanism and used for providing the locking position of the station LF furnace cover, the base, the supporting base, the locking hydraulic cylinder, the positioning shaft and the guide hole are fixed parts and do not operate along with the rotating mechanism, the locking holes are simple and practical in structure, the failure rate is low when the locking holes rotate along with the rotating mechanism, and the locking device is convenient to use. The base, the supporting seat, the locking hydraulic cylinder and the like are fixed parts, so that the overall stability of the locking mechanism is guaranteed.

Description

Technical Field

[0001] The invention relates to a locking device for an electrode rotating mechanism of a double-station LF furnace and a control method. Background Art

[0002] The double-station single-set electrode rotary heating LF furnace has been widely used in the metallurgical industry in recent years because of its high production efficiency, simple structure, low cost and ability to process two tanks of molten steel at the same time.

[0003] The No. 1 LF furnace of a steelmaking plant was originally designed as a double-station production mode with a single set of electrodes for rotational heating. However, since it was put into production, there have been problems such as large deviation between the electrode and the pole center circle of the furnace cover, the electrode scraping against the furnace cover, and slow rotation speed; the electrode centering position deviates during the heating period of the electrode system, and the electrode rotation positioning time is long, which seriously restricts production and urgently needs improvement. Summary of the invention

[0004] The purpose of the present invention is to provide a locking device and a control method for a double-station LF furnace electrode rotation mechanism, which improves the accuracy of the alignment between the electrode and the furnace cover polar center circle and shortens the positioning time.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A double-station LF furnace electrode locking device comprises a locking device, which comprises a support seat, a locking hydraulic cylinder, a positioning shaft, and a guide hole. The guide hole is fixedly connected to the base, the locking hydraulic cylinder is fixed on the support seat, the support seat is fixedly connected to the base, the positioning shaft is telescopically installed in the support seat, the piston rod of the locking hydraulic cylinder is axially connected to the positioning shaft, a locking hole is provided on a rotating mechanism, and the piston rod of the locking hydraulic cylinder drives the positioning shaft to pass through the guide hole and insert into the locking hole for locking and positioning.

[0007] The locking holes include locking hole 1 and locking hole 2. The locking hole 1 is located at the locking position of the LF furnace cover at the 1# station, and the locking hole 2 is located at the locking position of the LF furnace cover at the 2# station.

[0008] It also includes an electrode, an electrode cross arm, a rotating mechanism, and a rotating hydraulic cylinder. One end of the electrode cross arm is fixedly connected to the rotating mechanism, and the other end of the electrode cross arm is connected to the electrode. The rotating hydraulic cylinder is used to drive the rotating mechanism to move, and the rotating mechanism drives the electrode to rotate through the electrode cross arm.

[0009] The locking hydraulic cylinder and the rotating hydraulic cylinder are both connected to the hydraulic system.

[0010] A double-station LF furnace electrode locking control method is implemented based on PLC / DCS. Before the rotating mechanism is started, the locking device is unlocked, and the rotating mechanism drives the electrode cross arm and the electrode from the locking position of the LF furnace cover of the 1# station to the locking position of the LF furnace cover of the 2# station. When the rotating mechanism rotates at a set speed to reach the locking position of the LF furnace cover of the 2# station, the rotating mechanism stops rotating, the locking device locks the rotating mechanism in position, and the electrode is inserted into the machine center circle of the LF furnace cover to heat the molten steel.

[0011] After the heating is completed, the rotating mechanism rotates to the locking position of the LF furnace cover of the 1# station, forming a reciprocating motion.

[0012] The locking device is unlocked when the piston rod of the locking hydraulic cylinder drives the positioning shaft to retract into the support seat.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. Locking hole 1 and locking hole 2 are welded on the rotating mechanism respectively, which are used to provide the locking position of LF furnace cover at station 1# and the locking position of LF furnace cover at station 2#. The base, support seat, locking hydraulic cylinder, positioning shaft and guide hole are fixed parts and do not rotate with the rotating mechanism. The locking hole structure is simple and practical, and the failure rate is low when rotating with the rotating mechanism. The base, support seat, locking hydraulic cylinder, etc. are fixed parts to ensure the overall stability of the locking mechanism.

[0015] 2. A locating shaft is installed at the front section of the piston rod of the locking hydraulic cylinder. The locating shaft and the piston rod of the locking hydraulic cylinder are extended and retracted together. The locating shaft passes through the guide hole. During the extension and retraction process, the guide hole is used for guidance and radial fixation, which improves the accuracy of the alignment of the electrode and the core circle of the furnace cover and shortens the positioning time. The locking hole and the locating shaft are both conical in design to play a role in correcting deviation. The hydraulic cylinder and the locating shaft are designed with high strength and reliable locking. The locking hole and the locating shaft have the same taper and high locking accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the locking device of the electrode rotating mechanism of a double-station LF furnace.

[0017] Figure 2 It is a schematic diagram of the structure of the electrode system of a double-station LF furnace.

[0018] Figure 3 It is the rotation control flow chart of the rotating mechanism.

[0019] Figure 4 It is a curve diagram of the rotation speed and rotation angle of the rotating mechanism.

[0020] In the figure: 1-fixed base 2-support base 3-locking hydraulic cylinder 4-positioning shaft 5-guide hole 6-locking hole 7-rotating mechanism 8-rotating hydraulic cylinder 9-pole core circle 10-locking device 11-electrode 12-electrode cross arm 13-1# station LF furnace cover 14-2# station LF furnace cover. DETAILED DESCRIPTION

[0021] The present invention is described in detail below in conjunction with the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0022] The following examples are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0023] [Example 1]

[0024] A double-station LF furnace electrode rotation mechanism locking device consists of 5 parts, namely: a fixed base 1, a support base 2, a locking hydraulic cylinder 3, a positioning shaft 4, a guide hole 5, and a locking hole 6. Figure 1 The locking device uses a locking hydraulic cylinder 3 for locking. The locking hydraulic cylinder 3 is installed on the support seat 2, and the support seat 2 is installed on the fixed base 1. The front section of the piston rod of the locking hydraulic cylinder 3 is installed with a positioning shaft 4 that stretches together with the piston rod. The positioning shaft 4 passes through the guide hole 5. During the stretching process, the guide hole 5 guides and radially fixes it. There are 2 locking holes 6. Figure 2 , respectively welded on the rotating mechanism, providing the locking position of the LF furnace cover of the 1# station and the locking position of the LF furnace cover of the 2# station. The locking base 1, the support base 2, the locking hydraulic cylinder 3, the positioning shaft 4, and the guide hole 5 are fixed parts and do not rotate with the rotating mechanism. When the rotating mechanism rotates into place, the piston rod of the locking hydraulic cylinder 3 drives the positioning shaft 4 to pass through the guide hole 5 and insert into the locking hole 6 to realize locking positioning.

[0025] A locking control method for the electrode rotation mechanism of a double-station LF furnace, see Figure 3 , Figure 4 The electrode 11 and the electrode cross arm 12 are connected to the rotating mechanism 7 together. Before the rotating mechanism 7 is started, the locking device is unlocked, and the rotating mechanism 7 drives the electrode cross arm 12 and the electrode 11 to start and rotate from the 1# position (0°) to the 2# position (100°). When the set rotation speed reaches the 2# position (100°), the rotating mechanism 7 stops rotating, and the locking device locks the rotating mechanism 7. The electrode 11 can be accurately inserted into the pole center circle of the LF furnace cover to heat the molten steel. After the electrode 11 completes heating at the 2# position (100°), it rotates to the 1# position (0°) in the same way, and the rotating mechanism 7 forms a reciprocating motion.

[0026] The method for setting the rotation speed of the rotating mechanism 7 is as follows:

[0027] PLC gives the hydraulic proportional valve starting voltage, the valve core of the hydraulic proportional valve moves to drive the rotary hydraulic cylinder 8 to move, the rotary hydraulic cylinder 8 drives the rotary mechanism 7 to move, the rotary mechanism 7 drives the electrode cross arm 12 to rotate, the rotation of the electrode 11 starts from the 1# position (0°), the encoder 6 detects the rotation angle of the rotary mechanism 7, when the rotation angle reaches 90°, the PLC changes the output voltage, and as the angle increases, the voltage gradually decreases, so that the rotary mechanism 7 becomes a uniform deceleration motion mode, when the rotation angle of the rotary mechanism 7 reaches 100°, the PLC control voltage becomes 0, the rotary mechanism 7 stops, and finally forms Figure 3 The rotation speed control curve is shown in the figure. The electrode rotation time of 1#LF furnace is reduced from 8min to 2min, and the rotation positioning accuracy is increased from ±80mm to ±20mm, which can release more than 180t of production capacity per shift on average.

[0028] The locking hole 1 and the locking hole 2 of the present invention are respectively welded on the rotating mechanism, and are used to provide the locking position of the LF furnace cover of the 1# station and the locking position of the LF furnace cover of the 2# station. The base, the support seat, the locking hydraulic cylinder, the positioning shaft, and the guide hole are fixed parts and do not rotate with the rotating mechanism. The locking hole structure is simple and practical, and the failure rate is low when rotating with the rotating mechanism. The base, the support seat, the locking hydraulic cylinder, etc. are fixed parts to ensure the overall stability of the locking mechanism; the front section of the piston rod of the locking hydraulic cylinder is equipped with a positioning shaft, and the positioning shaft and the piston rod of the locking hydraulic cylinder are extended and retracted together. The positioning shaft passes through the guide hole. During the extension and retraction process, the guide hole is used for guiding and radial fixing, which improves the accuracy of the alignment of the electrode and the core circle of the furnace cover and shortens the positioning time. The locking hole and the positioning shaft are both conical in design, which play a role in correcting deviation. The hydraulic cylinder and the positioning shaft have high design strength and reliable locking. The locking hole and the positioning shaft have the same taper and high locking accuracy.

Claims

1. A double-station LF furnace electrode rotation mechanism locking device, characterized in that: It includes a locking device, which includes a support seat, a locking hydraulic cylinder, a positioning shaft, and a guide hole. The guide hole is fixedly connected to the base, the locking hydraulic cylinder is fixed on the support seat, the support seat is fixedly connected to the base, the positioning shaft is telescopically installed in the support seat, the piston rod of the locking hydraulic cylinder is axially connected to the positioning shaft, the rotating mechanism is provided with a locking hole, the piston rod of the locking hydraulic cylinder drives the positioning shaft to pass through the guide hole and insert into the locking hole for locking and positioning.

2. A double-station LF furnace electrode rotation mechanism locking device according to claim 1, characterized in that: The locking holes include locking hole 1 and locking hole 2, wherein locking hole 1 is located at the locking position of the LF furnace cover at station 1#, and locking hole 2 is located at the locking position of the LF furnace cover at station 2#.

3. A double-station LF furnace electrode rotation mechanism locking device according to claim 1, characterized in that: It also includes an electrode, an electrode cross arm, a rotating mechanism, and a rotating hydraulic cylinder. One end of the electrode cross arm is fixedly connected to the rotating mechanism, and the other end of the electrode cross arm is connected to the electrode. The rotating hydraulic cylinder is used to drive the rotating mechanism to move, and the rotating mechanism drives the electrode to rotate through the electrode cross arm.

4. A double-station LF furnace electrode rotation mechanism locking device according to claim 1, characterized in that: The locking hydraulic cylinder and the rotating hydraulic cylinder are both connected to the hydraulic system.

5. The device according to any one of claims 1 to 4 is used for a locking control method of a double-station LF furnace electrode rotation mechanism, which is implemented based on PLC / DCS, and is characterized in that: Before the rotation mechanism is started, the locking device is unlocked, and the rotation mechanism drives the electrode cross arm and the electrode from the locking position of the LF furnace cover of the 1# station to the locking position of the LF furnace cover of the 2# station. When the rotation mechanism reaches the locking position of the LF furnace cover of the 2# station at the set speed, the rotation mechanism stops rotating, and the locking device locks the rotation mechanism in place, and the electrode is inserted into the machine center circle of the LF furnace cover to heat the molten steel; After the heating is completed, the rotating mechanism rotates to the locking position of the LF furnace cover of the 1# station, forming a reciprocating motion.

6. A locking control method for a double-station LF furnace electrode rotation mechanism according to claim 5, characterized in that: The locking device is unlocked by the piston rod of the locking hydraulic cylinder driving the positioning shaft to retract into the supporting seat.

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