Method for accurately positioning steel ladle at casting position

Abstract

The invention relates to the technical field of steel ladle overturning and positioning of steelmaking continuous casting machines, in particular to a method for accurately positioning a steel ladle at a casting position, a gear limiting mechanism of the casting position is arranged on a rotary table gear, and the gear limiting mechanism limits the rotary table gear to the casting position of the steel ladle; the rotary table gear is in meshed connection with an external detection gear, the rotary table gear rotates to drive the detection gear to rotate, and a rotating shaft of the detection gear is connected with an encoder; the plc system processes the fed-back data to further judge the position of the steel ladle on the large ladle rotary table; the gear limiting mechanism mechanically positions a rotary table gear pouring position, the gear limiting mechanism clamps the rotary table gear, and the gear limiting mechanism transmits positioning information to the plc system to serve as a signal for triggering zero marking of the encoder and serve as the initial position of a large ladle rotary table; according to the invention, the detection value of the encoder is more accurate by using the signal transmitted in a limited manner, and meanwhile, the limiting signal is locked as a condition for triggering zero marking of the encoder.

Description

Technical Field

[0001] The invention relates to the technical field of ladle flipping and positioning of a steelmaking continuous casting machine, and in particular to a method for accurately positioning a ladle at a casting position. Background Art

[0002] Ladles are used in steel mills and foundries to receive molten steel and perform pouring operations in front of open hearth furnaces, electric furnaces or converters. When pouring, a ladle turntable is needed to turn the ladle over for pouring. As the most important equipment on the continuous casting machine, the ladle turntable is in frequent operation every day to rotate the molten steel from the ladle receiving position to the pouring position to meet the needs of subsequent processes.

[0003] During the rotation of the ladle turntable, the numerical feedback of the encoder installed on the rotating part is used to determine whether the ladle has rotated to the pouring position. Relatively accurate numerical feedback and minimization of errors are required to prevent the molten steel from not accurately flowing into the middle ladle.

[0004] The existing large ladle turntable is equipped with an encoder to determine the pouring position. The main problems are as follows: the encoder is installed on the rotating part of the entire large ladle turntable. Since the rotating part of the large ladle turntable is relatively large, and it will shake during the rotation, the accuracy of the encoder data collection will be affected. The values ​​collected and fed back by the encoder will have errors during rotation. This will cause the large ladle turntable to not rotate in place or rotate too much, causing safety derivative accidents in the ladle pouring work.

[0005] Therefore, it is necessary to design a method for accurately positioning the ladle at the casting position to solve the problem of inaccurate positioning of the ladle casting position caused by installing an encoder on the rotating part of the existing ladle turntable. Summary of the invention

[0006] In view of the problems existing in the prior art, the object of the present invention is to provide a method for accurately positioning a ladle at a casting position.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a method for accurately positioning a ladle at a casting position, comprising the following steps:

[0008] S1. The ladle turret on the continuous casting machine rotates to rotate the molten steel in the ladle position to the pouring position;

[0009] S2. The rotation of the ladle turret is driven by gears. A gear limiting mechanism for the casting position is provided on the turret gear. The gear limiting mechanism limits the turret gear to the casting position of the ladle.

[0010] S3, the turntable gear is meshed with the external detection gear, the rotation of the turntable gear drives the detection gear to rotate, and the rotating shaft of the detection gear is connected to the encoder;

[0011] S4, the encoder starts to detect the value and feed it back to the PLC system at the same time, and the PLC system processes the feedback data to further determine the position of the ladle on the ladle turntable;

[0012] S5. At the same time, the gear limit mechanism mechanically positions the turntable gear casting position, the gear limit mechanism clamps the turntable gear, and the gear limit mechanism transmits the positioning information to the PLC system. This position is used as a signal to trigger the encoder zero mark and as the starting position of the large package turntable.

[0013] Specifically, the gear limiting mechanism in step S2 includes a locking pin, a rocker arm and a swing motor. The swing motor is installed in the protective cover. The motor shaft of the swing motor is connected to the rocker arm through a reducer. The swing motor drives the rocker arm to swing. The rocker arm extends out of the strip hole at the top of the protective cover. A locking pin is installed on the top of the rocker arm, and the rocker arm drives the locking pin to approach or move away from the turntable gear.

[0014] Specifically, a proximity switch is installed on the outer side of the locking pin, and a detection stop iron is installed on the outer side of the turntable gear. When the turntable gear rotates to the casting position, the detection stop iron is opposite to the proximity switch. The proximity switch is connected to the PLC system. The proximity switch transmits the signal that the turntable gear rotates to the casting position to the PLC system. The PLC system controls the operation of the swing motor and controls the locking pin to be inserted into the tooth groove of the turntable gear to lock and limit.

[0015] Specifically, the detection gear in step S3 uses a small gear with the same module as the turntable gear to transmit the power of the large bag turntable to the small gear on which the encoder is installed.

[0016] Specifically, the rotation of the turntable gear in step S3 drives the detection gear to rotate, that is, when the large bag turntable rotates, the turntable gear will synchronously drive the small gear to rotate, and the encoder also starts to perform numerical detection and feedback to the PLC system at the same time.

[0017] Specifically, the encoder in step S3 is an angular displacement encoder.

[0018] The present invention has the following beneficial effects:

[0019] The method for accurately positioning the ladle at the casting position designed by the present invention first transmits the turntable gear transmission on the large ladle turntable to an external small gear with the same module, so that the detection position of the encoder is reduced. The meshing clearance between the small gear and the turntable gear eliminates the error influence caused by jitter, thereby making the detection accuracy of the encoder higher.

[0020] The method for accurately positioning the ladle at the casting position designed by the present invention utilizes the casting position of the mechanical position to add a gear limit mechanism to lock and unlock the limit, and utilizes the signal transmitted by the limit to make the detection value of the encoder more accurate, and simultaneously locks the limit signal as a condition for triggering the encoder to mark zero, and utilizes the position of the machinery and the encoder to more accurately confirm that the ladle is in the casting position, thereby avoiding safety derivative accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the gear limiting mechanism of the present invention not being limited at the casting position.

[0022] Figure 2 It is a structural schematic diagram of the gear limiting mechanism of the present invention for limiting the casting position.

[0023] In the figure: 1-turntable gear; 2-detection gear; 3-encoder;

[0024] 4- gear limit mechanism, 4.1- locking pin, 4.2- proximity switch, 4.3- detection stop iron, 4.4- rocker arm, 4.5- swing motor, 4.6- protective cover. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely further describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] Embodiment 1:

[0027] like Figure 1-Figure 2 As shown, a method for accurately positioning a ladle at a casting position comprises the following steps:

[0028] 1. The ladle turret on the continuous casting machine rotates to rotate the molten steel in the ladle position to the pouring position.

[0029] 2. A gear transmission device is designed on the rotating part of the entire ladle turntable. The rotation of the ladle turntable is transmitted through gears. The turntable gear 1 is meshed and connected to the external detection gear 2. The rotation of the turntable gear 1 drives the detection gear 2 to rotate. The encoder 3 is connected to the rotating shaft of the detection gear 2.

[0030] The detection gear 2 uses a small gear with the same module as the turntable gear 1 to transmit the power of the large bag turntable to the small gear installed with the encoder 3 to achieve power transmission.

[0031] 3. A gear limit mechanism 4 at the casting position is set on the turret gear 1, and the gear limit mechanism 4 limits the turret gear 1 to the casting position of the ladle, which is equivalent to the mechanical casting position, and the gear limit mechanism 4 is designed to lock and unlock the position.

[0032] The gear limiting mechanism 4 includes a locking pin 4.1, a proximity switch 4.2, a detection stop iron 4.3, a rocker arm 4.4 and a swing motor 4.5. The swing motor 4.5 is installed in a protective cover 4.6. The motor shaft of the swing motor 4.5 is connected to the rocker arm 4.4 through a reducer. The swing motor 4.5 drives the rocker arm 4.4 to swing. The rocker arm 4.4 extends out of the strip hole at the top of the protective cover 4.6. The locking pin 4.1 is installed on the top of the rocker arm 4.4. The rocker arm 4.4 drives the locking pin 4.1 to approach or move away from the turntable gear 1.

[0033] A proximity switch 4.2 is installed on the outside of the locking pin 4.1, and a detection stop iron 4.3 is installed on the outside of the turntable gear 1. When the turntable gear 1 rotates to the casting position, the detection stop iron 4.3 faces the proximity switch 4.2. The proximity switch 4.2 is connected to the PLC system. The proximity switch 4.2 transmits the signal that the turntable gear 1 rotates to the casting position to the PLC system. The PLC system controls the swing motor 4.5 to work, and controls the locking pin 4.1 to be inserted into the tooth groove of the turntable gear 1 to lock and limit.

[0034] 4. When the turntable gear 1 rotates, the detection gear 2 rotates. That is, when the ladle turntable rotates, the turntable gear 1 will synchronously drive the pinion to rotate, and the encoder 3 also starts to detect the value and feed it back to the PLC system. The PLC system processes the feedback data to further determine the position of the ladle on the ladle turntable.

[0035] 5. At the same time, the gear limit mechanism 4 mechanically positions the turntable gear 1 at the casting position, and the gear limit mechanism 4 clamps the turntable gear 1. When the ladle turntable rotates to the casting position, the locking pin 4.1 acts to clamp the turntable gear 1 of the ladle, and at the same time, the locking limit of the locking pin 4.1 is triggered. The gear limit mechanism 4 transmits the positioning information to the PLC system. This position is used as a signal to trigger the encoder zero mark and as the starting position of the ladle turntable.

[0036] The encoder 3 is an angular displacement encoder.

[0037] The present invention uses the mechanical position of the casting position to add locking and unlocking limit, uses the signal transmitted by the limit to make the detection value of the encoder 3 more accurate, and simultaneously locks the limit signal as a condition for triggering the encoder 3 to mark zero. The position of the machine and the encoder 3 is used to more accurately confirm that the ladle is in the casting position, avoiding safety derivative accidents.

[0038] The present invention is not limited to the above-mentioned implementation modes, and anyone should be aware of the structural changes made under the enlightenment of the present invention, and all those having the same or similar technical solutions as the present invention fall within the protection scope of the present invention.

[0039] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A method for accurately positioning a ladle at a casting position, characterized in that: The following steps are involved: S1. The ladle turret on the continuous casting machine rotates to rotate the molten steel in the ladle position to the pouring position; S2. The rotation of the ladle turret is driven by gears. A gear limiting mechanism for the casting position is provided on the turret gear. The gear limiting mechanism limits the turret gear to the casting position of the ladle. S3, the turntable gear is meshed with the external detection gear, the rotation of the turntable gear drives the detection gear to rotate, and the rotating shaft of the detection gear is connected to the encoder; S4, the encoder starts to detect the value and feed it back to the PLC system at the same time, and the PLC system processes the feedback data to further determine the position of the ladle on the ladle turntable; S5. At the same time, the gear limit mechanism mechanically positions the turntable gear casting position, the gear limit mechanism clamps the turntable gear, and the gear limit mechanism transmits the positioning information to the PLC system. This position is used as a signal to trigger the encoder zero mark and as the starting position of the large package turntable.

2. The method for accurately positioning a ladle at a casting position according to claim 1, characterized in that: The gear limiting mechanism in step S2 includes a locking pin, a rocker arm and a swing motor. The swing motor is installed in the protective cover. The motor shaft of the swing motor is connected to the rocker arm through a reducer. The swing motor drives the rocker arm to swing. The rocker arm extends out of the strip hole at the top of the protective cover. The locking pin is installed on the top of the rocker arm. The rocker arm drives the locking pin to move closer to or away from the turntable gear.

3. The method for accurately positioning a ladle at a casting position according to claim 2, characterized in that: A proximity switch is installed on the outer side of the locking pin, and a detection stop iron is installed on the outer side of the turntable gear. When the turntable gear rotates to the casting position, the detection stop iron is opposite to the proximity switch. The proximity switch is connected to the PLC system. The proximity switch transmits the signal that the turntable gear rotates to the casting position to the PLC system. The PLC system controls the operation of the swing motor and controls the locking pin to be inserted into the tooth groove of the turntable gear to lock and limit.

4. The method for accurately positioning a ladle at a casting position according to claim 1, characterized in that: The detection gear in step S3 adopts a small gear with the same module as the turntable gear, which transmits the power of the large bag turntable to the small gear on which the encoder is installed.

5. The method for accurately positioning a ladle at a casting position according to claim 1, characterized in that: The rotation of the turntable gear in step S3 drives the detection gear to rotate, that is, when the large bag turntable rotates, the turntable gear will synchronously drive the small gear to rotate, and the encoder also starts to perform numerical detection and feedback to the PLC system at the same time.

6. The method for accurately positioning a ladle at a casting position according to claim 1, characterized in that: The encoder in step S3 is an angular displacement encoder.

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