CN112698677A - System and method for measuring and controlling liquid level of front box of casting and rolling machine - Google Patents
System and method for measuring and controlling liquid level of front box of casting and rolling machine Download PDFInfo
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- CN112698677A CN112698677A CN202011577487.1A CN202011577487A CN112698677A CN 112698677 A CN112698677 A CN 112698677A CN 202011577487 A CN202011577487 A CN 202011577487A CN 112698677 A CN112698677 A CN 112698677A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
Abstract
The invention discloses a liquid level measurement and control system for a front box of a casting and rolling machine, which comprises a liquid level measuring mechanism, a furnace mouth flow regulating mechanism and an electric cabinet; the liquid level measuring mechanism is arranged on a front box at the front end of the casting and rolling machine, and an angular displacement encoder of the liquid level measuring mechanism can acquire a liquid level signal in the front box; the angular displacement encoder is electrically connected with the input end of a controller of an electric cabinet arranged beside; the bottom end of an electric push rod of the furnace mouth flow regulating mechanism is provided with a pin shaft, the working end of the electric push rod is connected with a rocking handle part of a connecting swing arm, a cross rod part of the connecting swing arm is rotatably supported above the flow channel through a supporting assembly, the middle of the cross rod part is connected with an adjusting blocking rod through an adjusting seat, and a plug at the front end of the adjusting blocking rod can block a liquid outlet hole; the electric push rod is electrically connected to the electric cabinet. The system and the method for measuring and controlling the liquid level of the front box of the casting and rolling machine can accurately measure the liquid level of the aluminum liquid in the front box and simultaneously control the supply flow of the aluminum liquid in a linkage manner, are controlled in a closed loop manner, save labor, ensure the stable liquid level of the aluminum liquid in the front box and improve the casting and rolling quality.
Description
Technical Field
The invention relates to the technical field of continuous casting and rolling, in particular to a system and a method for measuring and controlling the liquid level of a front box of a casting and rolling machine.
Background
In the production process of aluminum casting and rolling, the quality of a rolled aluminum plate can be directly influenced by the fluctuation of the liquid level of the aluminum liquid in the front box. Meanwhile, in order to ensure the continuity of the casting and rolling process, when the casting and rolling speed is changed, the flow of the molten aluminum also needs to be correspondingly changed, so that the accurate measurement and control of the liquid level of the front box are very important.
At present, in the casting and rolling production process, the liquid level of the aluminum liquid of the front box is required to be kept stable, and the mode of controlling the liquid level of the front box is usually manually observed and manually adjusted to form a furnace eye drill plug of a heat preservation furnace. When the condition is serious, the plate can be broken, so that the rolling is interrupted, the production efficiency is reduced, the manufacturing cost is increased, the labor is occupied, and the product quality is unstable.
Therefore, it is necessary to develop a system and a method for measuring and controlling the liquid level of the front box of the casting and rolling machine.
Disclosure of Invention
The invention aims to provide a cast-rolling machine front box liquid level measurement and control system which can accurately measure the liquid level of aluminum liquid in a front box and simultaneously control the supply flow of the aluminum liquid in a linkage manner, is in closed-loop control, saves manpower, ensures the stability of the liquid level of the aluminum liquid in the front box, and improves the cast-rolling quality.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a liquid level measurement and control system for a front box of a casting and rolling machine, which comprises a liquid level measuring mechanism, a furnace mouth flow regulating mechanism and an electric control box, wherein the furnace mouth flow regulating mechanism is arranged on the front box;
the liquid level measuring mechanism is arranged on a front box at the front end of the casting and rolling machine and comprises a support assembly, an angular displacement encoder, a first vertical rod, a first cross rod and a first buoy, the angular displacement encoder is supported on one side above the front box through the support assembly, the middle position of the first cross rod is connected to a middle shaft of the angular displacement encoder, the bottom end of the first vertical rod is connected with the first buoy and is vertically arranged in the front box, the top end of the first vertical rod is connected to the inner end of the first cross rod through a pin shaft, and the outer end of the first cross rod is provided with a first balancing weight for adjusting balance; the angular displacement encoder is electrically connected with the controller input end of the electric cabinet arranged beside;
the furnace mouth flow regulating mechanism comprises an electric push rod, a connecting swing arm, a supporting assembly and an adjusting blocking rod, wherein the bottom end of the electric push rod is installed through a pin shaft, the working end of the electric push rod is connected with a rocking handle part of the connecting swing arm, a cross rod part of the connecting swing arm is rotatably supported above the flow groove through the supporting assembly, an adjusting seat is arranged at the middle position of the cross rod part, the adjusting blocking rod is connected to the adjusting seat through a pin shaft, and a plug at the front end of the adjusting blocking rod can block a liquid outlet hole of the heat preservation furnace; the electric push rod is electrically connected to the electric cabinet.
Furthermore, the support assembly comprises a first pin shaft seat and a swing arm, the bottom of the first pin shaft seat is fixedly connected to the casting and rolling machine frame, one end of the swing arm is connected with the first pin shaft seat through a pin shaft, and the angular displacement encoder is arranged at the top of the other end of the swing arm.
Furthermore, the liquid level measuring mechanism further comprises a first bearing seat, a rotating shaft is installed in the first bearing seat, the rotating shaft is coaxially connected with the center shaft of the angular displacement encoder, and the shaft end of the rotating shaft is fixedly connected to the middle position of the first cross rod.
Furthermore, the end face of the first bearing seat is provided with two limit screws, and the two limit screws are respectively arranged on two sides of the rotating shaft to limit the swing range of the first cross rod.
Furthermore, a motor of the electric push rod specifically adopts a servo motor or a variable frequency motor, and the motor is electrically connected to a servo or variable frequency driver in the electric cabinet.
Furthermore, the support assembly comprises a second bearing seat and a connecting seat, the two second bearing seats are respectively provided with the connecting swing arm above the side wall of the launder, the second bearing seat is arranged at the top end of the connecting seat, the inner plate of the connecting seat is connected to a welding block through a bolt, and the welding block is welded on the side wall of the launder; the bottom end of the electric push rod is connected to a supporting frame beside through a second pin shaft seat in a pin joint mode.
The device further comprises a launder liquid level monitoring mechanism, wherein the launder liquid level monitoring mechanism is arranged at one end of the launder close to the heat preservation furnace;
the launder liquid level monitoring mechanism comprises a support, a second cross rod, a fulcrum block, a second upright rod and a second buoy, wherein the support is fixedly connected to the side wall of the launder, the second cross rod is connected to the top of the support at the bottom of the fulcrum in the middle of the support in a swinging manner through the fulcrum block which is penetrated and installed in the middle of the second cross rod, one end of the second cross rod is connected with the second upright rod through a pin shaft, the other end of the second cross rod is provided with an induction flange, the support is provided with a displacement sensor on one side of the induction flange, and the displacement sensor is electrically connected to the input end of; the second vertical rod is vertically arranged in the runner, and the bottom end of the second vertical rod is connected with the second buoy.
Further, the response flange specifically adopts right angle limit shape steel sheet, displacement sensor includes first displacement sensor and second displacement sensor, first displacement sensor cooperation the lower dull and stereotyped limit setting of response flange, the cooperation of second displacement sensor the vertical flange limit setting of response flange.
Further, the first displacement sensor is an inductive sensor, and the second displacement sensor is a proximity switch.
The invention also discloses a method for measuring and controlling the liquid level of the front box of the casting and rolling machine, which applies any one of the systems for measuring and controlling the liquid level of the front box of the casting and rolling machine to carry out closed-loop control on the liquid level of the front box, and utilizes an angular displacement encoder to collect the liquid level position of the front box and control the action of an electric push rod to adjust the supply flow of aluminum liquid.
Compared with the prior art, the invention has the beneficial technical effects that:
according to the liquid level measurement and control system for the front box of the casting and rolling machine, a rod piece structure in a balanced state is established through the arrangement of the liquid level measuring mechanism, so that the load resistance of a first buoy is reduced, the liquid level change can be better reflected, the adoption of an angular displacement encoder with higher precision can convert a liquid level signal into a sensitive angle signal for collection, the liquid level collection precision is improved, a connecting swing arm is driven by an electric push rod to drive an adjusting blocking rod to move back and forth, the flow cross section of a liquid outlet hole can be adjusted, and the supply flow of aluminum liquid is controlled; and performing PID calculation and closed control by cyclic collection, and performing accurate front box liquid level control. The system and the method for measuring and controlling the liquid level of the front box of the casting and rolling machine can accurately measure the liquid level of the aluminum liquid in the front box and simultaneously control the supply flow of the aluminum liquid in a linkage manner, are controlled in a closed loop manner, save manpower, ensure the stability of the liquid level of the aluminum liquid in the front box and improve the casting and rolling quality.
In addition, through constitute by first round pin axle bed and swing arm round pin axle articulated mode the support subassembly installation angular displacement encoder, the first pole setting of messenger that can be nimble takes one's place, and when breaking down moreover and needing to overhaul, rotate the swing arm and just can take out first pole setting and first cursory, the maintenance of being convenient for is overhauld. Through setting up supplementary first bearing frame, increase the rotation axis bears the overturning moment of transmission on the first horizontal pole, has protected angle displacement encoder axis, has guaranteed measurement accuracy and angle displacement encoder life. Through the setting of stop screw, can restrict the swing range of first horizontal pole, avoid appearing exceeding the scope and deflect and can't reset. By adopting the electric push rod of the servo motor, the telescopic stroke of the electric push rod can be accurately controlled, and the displacement of the plug is further controlled to adjust the flow sectional area of the liquid outlet hole; the supporting assembly of the second bearing seat can reduce the rotation resistance and has higher stability; through the setting of the open slot at handle and adjustment seat top, the manual work of being convenient for is nimble to be taken the adjustment stifled pole, carries out manual intervention. Through the setting of chute liquid level monitoring mechanism, can gather the liquid level of flowing aluminium liquid in the one end that the chute is close to the heat preservation stove, transmit the controller for the electric cabinet, as the foundation of supplementary judgement. Through the setting of first displacement sensor and second displacement sensor, can gather the adjustment point of this place liquid level.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a schematic view of a composition structure of a liquid level measurement and control system of a front box of a casting and rolling machine;
FIG. 2 is a schematic front view of the liquid level measuring mechanism of the present invention;
FIG. 3 is a schematic top view of the fluid level gauge mechanism of the present invention;
FIG. 4 is a schematic view of the structure of FIG. 3 from direction A;
FIG. 5 is a schematic structural view of the furnace mouth flow regulating mechanism of the present invention;
FIG. 6 is a schematic top view of the furnace mouth flow regulating mechanism of the present invention;
FIG. 7 is a schematic side view of the furnace mouth flow regulating mechanism of the present invention;
fig. 8 is a schematic view of the main structure of the flow cell liquid level monitoring mechanism of the invention.
Description of reference numerals: 1. a holding furnace; 2. a launder; 201. welding a block; 202. welding a base plate; 3. a front box; 4. a casting and rolling machine; 5. a liquid level measuring mechanism; 501. a first pin shaft seat; 502. swinging arms; 503. an angular displacement encoder; 504. a first upright rod; 5041. connecting blocks; 505. a first cross bar; 5051. a pinning arm; 5052. a first weight block; 506. a first bearing housing; 5061. a limit screw; 507. a first buoy; 6. a furnace mouth flow regulating mechanism; 601. a second pin shaft seat; 602. an electric push rod; 603. connecting the swing arm; 6031. an adjusting seat; 604. a second bearing housing; 605. a connecting seat; 606. adjusting the blocking rod; 6061. a plug; 6062. a handle; 7. an electric cabinet; 8. a launder liquid level monitoring mechanism; 801. a support; 8011. a fulcrum bottom bracket; 802. a second cross bar; 8021. inducing the flange; 803. a fulcrum block; 804. a second counterweight block; 805. a third counterweight block; 806. a second upright stanchion; 807. a second buoy; 808. a first displacement sensor; 809. a second displacement sensor.
Detailed Description
The core of the invention is to provide a system and a method for measuring and controlling the liquid level of the front box of the casting and rolling machine, which can accurately measure the liquid level of the aluminum liquid in the front box and simultaneously control the supply flow of the aluminum liquid in a linkage manner, realize closed-loop control, save labor, ensure the stability of the liquid level of the aluminum liquid in the front box and improve the casting and rolling quality.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Referring to the attached drawings, FIG. 1 is a schematic structural diagram of a liquid level measurement and control system of a front box of a casting and rolling machine; FIG. 2 is a schematic front view of the liquid level measuring mechanism of the present invention; FIG. 3 is a schematic top view of the fluid level gauge mechanism of the present invention; FIG. 4 is a schematic view of the structure of FIG. 3 from direction A; FIG. 5 is a schematic structural view of the furnace mouth flow regulating mechanism of the present invention; FIG. 6 is a schematic top view of the furnace mouth flow regulating mechanism of the present invention; FIG. 7 is a schematic side view of the furnace mouth flow regulating mechanism of the present invention; fig. 8 is a schematic view of the main structure of the flow cell liquid level monitoring mechanism of the invention.
In a specific embodiment, as shown in fig. 1 to 7, the liquid level measurement and control system for the front box of the casting and rolling machine of the present invention includes a liquid level measurement mechanism 5, a furnace mouth flow regulation mechanism 6 and an electric cabinet 7:
the liquid level measuring mechanism 5 is installed on a rack housing of the casting and rolling machine 4 and used for detecting the liquid level of the front box 3, the liquid level measuring mechanism 5 comprises a support component, an angular displacement encoder 503, a first upright rod 504, a first cross rod 505 and a first buoy 507, the angular displacement encoder 503 is supported on one side above the front box 3 through the support component, the middle position of the first cross rod 505 is tightly supported and fixedly connected on the extending end of a middle shaft of the angular displacement encoder 503 through a jackscrew, the bottom end of the first upright rod 504 is connected with the first buoy 507 and vertically arranged in the front box 3, the top end of the first upright rod 504 is provided with a screw rod and is in threaded connection with a connecting block 5041, the connecting block 5041 is in pin shaft connection with a pin joint arm 5051, and the pin joint arm 5051 is arranged at the inner end. The outer end of the first cross bar 505 is provided with a first weight 5052 for adjusting balance. The angular displacement encoder 503 is electrically connected to a controller input of the electric cabinet 7 disposed at one side. After the liquid level of aluminum liquid in the front box 3 changes, the first buoy 507 drives the first vertical rod 504 to move in the vertical direction, so that the balance state of the first cross rod 505 is broken, the middle shaft of the angular displacement encoder 503 is driven to rotate by a certain angle, and an angle signal is fed back to the input end of the controller.
The furnace mouth flow regulating mechanism 6 comprises an electric push rod 602, a connecting swing arm 603, a supporting assembly and an adjusting blocking rod 606, wherein the bottom end of the electric push rod 602 is installed through a pin shaft, and the working end of the electric push rod is connected with a rocking handle part of the swing arm 603 through a pin shaft. The cross rod part connected with the swing arm 603 is rotatably supported above the launder 2 through a support assembly, an adjusting seat 6031 is arranged in the middle of the cross rod part, an adjusting blocking rod 606 is connected to the adjusting seat 6031 through a pin shaft, and a plug 6061 at the front end of the adjusting blocking rod 606 can block a liquid outlet hole of the holding furnace 1; the electric push rod 602 is electrically connected to the electric cabinet 7. When the electric push rod 602 performs telescopic motion, the rocking handle part of the connecting swing arm 603 is driven to rotate the cross rod part of the connecting swing arm 603, and then the adjusting seat 6031 swings back and forth to drive the adjusting blocking rod 606 to move back and forth, so that the flow cross-sectional area of the liquid outlet hole can be reduced when the adjusting seat 6031 moves forward, and the flow cross-sectional area of the liquid outlet hole can be increased when the adjusting seat 6031 moves backward.
The controller specifically adopts a PLC control unit and is configured with an analog input/output module, the controller calculates to obtain the liquid level information of the aluminum liquid in the front box 3 according to the collected angle signal, the program makes a judgment according to a set value range, controls the electric push rod 602 to move in an extending and contracting mode, adjusts the flow rate, and circularly collects to perform PID calculation and close control.
Through the arrangement of the liquid level measuring mechanism 5, a rod member structure in a balanced state is established, the load resistance of the first buoy 507 is reduced, the liquid level change can be better reflected, the adoption of the angular displacement encoder 503 with higher precision can convert a liquid level signal into a sensitive angle signal for collection, the liquid level collection precision is improved, the electric push rod 602 drives the connecting swing arm 603 to further drive the adjusting blocking rod 606 to move back and forth, the flow cross section of the liquid outlet hole can be adjusted, and the supply flow of aluminum liquid is controlled; and performing PID calculation and closed control by cyclic collection, and performing accurate front box liquid level control. The system and the method for measuring and controlling the liquid level of the front box of the casting and rolling machine can accurately measure the liquid level of the aluminum liquid in the front box and simultaneously control the supply flow of the aluminum liquid in a linkage manner, are controlled in a closed loop manner, save manpower, ensure the stability of the liquid level of the aluminum liquid in the front box and improve the casting and rolling quality.
In an embodiment of the present invention, as shown in fig. 2 and 3, the support assembly includes a first pin shaft seat 501 and a swing arm 502, a bottom of the first pin shaft seat 501 is fixedly connected to a welding backing plate of the frame of the casting and rolling machine 4 through a bolt, one end of the swing arm 502 is connected to the first pin shaft seat 501 through a pin, and an angular displacement encoder 503 is disposed at a top of the other end of the swing arm 502.
Specifically, as shown in fig. 3 and 4, the liquid level measuring mechanism 5 further includes a first bearing block 506, a rotating shaft is installed in the first bearing block 506, the rotating shaft is coaxially connected with the center shaft of the angular displacement encoder 503, and the shaft end of the rotating shaft is inserted into a middle hole of the first cross bar 505 and locked by a jackscrew. The position of the intermediate hole is determined by the distance of the launder headbox from the caster stand and is balanced by a counterweight 5052.
Specifically, as shown in fig. 3 and 4, the end surface of the first bearing block 506 is provided with two limit screws 5061, the number of the limit screws 5061 is two, the two limit screws 5061 are symmetrically installed at the upper positions on both sides of the rotation shaft, and the limit screws 5061 limit the swing lowest position and highest position range of the first crossbar 505.
The angular displacement encoder 503 is installed on the support assembly formed by the first pin shaft seat 501 and the swing arm 502 in a pin shaft hinge mode, so that the first vertical rod 504 can be flexibly in place, and when a fault occurs and the maintenance is required, the first vertical rod 504 and the first buoy 507 can be taken out by rotating the swing arm 502, and the maintenance and the repair are convenient. By arranging the auxiliary first bearing seat 506, the overturning moment transmitted by the rotating shaft on the first cross rod 505 is increased, the middle shaft of the angular displacement encoder 503 is protected, and the measurement accuracy and the service life of the angular displacement encoder 503 are ensured. Through the setting of limit screw 5061, can restrict the swing range of first horizontal pole 505, avoid appearing exceeding the scope and deflect and can't reset.
In an embodiment of the present invention, as shown in fig. 5 to 7, a driving motor of the electric push rod 602 specifically adopts a servo motor or a variable frequency motor, and the motor is electrically connected to a servo or variable frequency driver in the electric cabinet 7.
Specifically, as shown in fig. 5 to 7, the support assembly includes a second bearing seat 604 and a connecting seat 605, the two second bearing seats 604 respectively span a connecting swing arm 603 above the side wall of the runner 2, the second bearing seat 604 is installed on the top end of the connecting seat 605, the inner plate of the connecting seat 605 is connected to the welding block 201 through a bolt, and the welding block 201 is welded on the side wall of the runner 2. The bottom end of the electric push rod 602 is connected to a support bracket by a second pin shaft seat 601 through a pin joint.
Specifically, as shown in fig. 6, one end of the rod body of the adjusting plug rod 606 is provided with a plug 6061, and the other end is provided with a handle 6062, and a pin shaft is disposed at the middle position of the rod body and placed in an open slot at the top of the adjusting seat 6031 to form a pin joint structure convenient to detach.
By adopting the electric push rod 602 of the servo motor, the telescopic stroke of the electric push rod 602 can be accurately controlled, and further the displacement of the plug 6061 is controlled to adjust the flow cross section of the liquid outlet hole; by adopting the supporting component of the second bearing seat 604, the rotation resistance can be reduced, and the stability is higher; through the setting of handle 6062 and the open slot at adjustment seat 6031 top, the manual work of being convenient for is nimble to be taken adjustment stifled pole 606, carries out manual intervention.
In an embodiment of the present invention, as shown in fig. 8, the system for measuring and controlling the liquid level of the front box of the casting and rolling machine further comprises a launder liquid level monitoring mechanism 8, wherein the launder liquid level monitoring mechanism 8 is disposed at one end of the launder 2 close to the holding furnace 1.
The launder liquid level monitoring mechanism 8 comprises a support 801, a second cross bar 802, a fulcrum block 803, a second upright rod 806 and a second float 807, the support 801 is fixedly connected to the side wall of the launder 2, the second cross bar 802 can be swingably connected to the top of the fulcrum bottom support 8011 in the middle of the support 801 through the fulcrum block 803 which is penetrated and installed in the middle, one end of the second cross bar 802 is connected with the other end of the second upright rod 806 through a pin shaft, an induction flange 8021 is arranged at one side of the induction flange 8021 of the support 801, and the displacement sensor is electrically connected to the input end of a controller of the electric cabinet 7; the second upright rod 806 is vertically arranged in the launder 2 and the bottom end is connected with the second buoy 807.
Specifically, the launder liquid level monitoring mechanism 8 further includes a second balancing weight (804) and a third balancing weight block (805), and the second balancing weight (804) and the third balancing weight block (805) can movably penetrate through the second cross rod 802 and are respectively located at two sides of the fulcrum block 803, so that the balance position of the second cross rod 802 can be adjusted in an auxiliary manner.
Specifically, as shown in fig. 8, the sensing flange 8021 is specifically a steel plate with a right-angled edge shape, the displacement sensor includes a first displacement sensor 808 and a second displacement sensor 809, the first displacement sensor 808 is arranged in cooperation with a lower flat edge of the sensing flange 8021, and the second displacement sensor 809 is arranged in cooperation with a vertical plate edge of the sensing flange 8021.
Specifically, as shown in fig. 8, the first displacement sensor 808 is an inductive sensor, and the second displacement sensor 809 is a proximity switch.
Specifically, the number of the proximity switches is four, the middle of the vertical direction is two, the switch functions to detect the rise or fall of the liquid level, the function of inching the position of the control plug 6061 can be played, and the proximity switches at the upper end and the lower end of the vertical direction function to accelerate the adjustment of the position of the plug 6061 or alarm of the abnormal liquid level.
Through the setting of chute liquid level monitoring mechanism 8, can gather the liquid level of mobile aluminium liquid at the one end that chute 2 is close to heat preservation stove 1, transmit the controller for electric cabinet 7, as the foundation of supplementary judgement. By the arrangement of the first displacement sensor 808 and the second displacement sensor 809, a setpoint of the liquid level can be detected there.
The invention also discloses a method for measuring and controlling the liquid level of the front box of the casting and rolling machine, which applies the system for measuring and controlling the liquid level of the front box of the casting and rolling machine in any embodiment to carry out closed-loop control on the liquid level of the front box, and utilizes an angular displacement encoder to collect the position of the liquid level of the front box and control the action of an electric push rod to adjust the supply flow of aluminum liquid.
According to the liquid level measurement and control system for the front box of the casting and rolling machine, a rod piece structure in a balanced state is established through the arrangement of the liquid level measuring mechanism 5, the load resistance of the first buoy 507 is reduced, the liquid level change can be better reflected, the adoption of the angular displacement encoder 503 with higher precision can convert a liquid level signal into a sensitive angle signal for collection, the liquid level collection precision is improved, the electric push rod 602 drives the connecting swing arm 603 to further drive the adjusting blocking rod 606 to move back and forth, the flow cross section of a liquid outlet hole can be adjusted, and the supply flow of aluminum liquid is further controlled; and performing PID calculation and closed control by cyclic collection, and performing accurate front box liquid level control. The system and the method for measuring and controlling the liquid level of the front box of the casting and rolling machine can accurately measure the liquid level of the aluminum liquid in the front box and simultaneously control the supply flow of the aluminum liquid in a linkage manner, are controlled in a closed loop manner, save manpower, ensure the stability of the liquid level of the aluminum liquid in the front box and improve the casting and rolling quality. In addition, the angular displacement encoder 503 is installed on the support assembly formed by the first pin shaft seat 501 and the swing arm 502 in a pin shaft hinge mode, so that the first vertical rod 504 can be flexibly in place, and when a fault occurs and the maintenance is needed, the first vertical rod 504 and the first buoy 507 can be taken out by rotating the swing arm 502, and the maintenance and the repair are convenient. By arranging the auxiliary first bearing seat 506, the overturning moment transmitted by the rotating shaft on the first cross rod 505 is increased, the middle shaft of the angular displacement encoder 503 is protected, and the measurement accuracy and the service life of the angular displacement encoder 503 are ensured. Through the setting of limit screw 5061, can restrict the swing range of first horizontal pole 505, avoid appearing exceeding the scope and deflect and can't reset. By adopting the electric push rod 602 of the servo motor, the telescopic stroke of the electric push rod 602 can be accurately controlled, and further the displacement of the plug 6061 is controlled to adjust the flow cross section of the liquid outlet hole; by adopting the supporting component of the second bearing seat 604, the rotation resistance can be reduced, and the stability is higher; through the setting of handle 6062 and the open slot at adjustment seat 6031 top, the manual work of being convenient for is nimble to be taken adjustment stifled pole 606, carries out manual intervention. Through the setting of chute liquid level monitoring mechanism 8, can gather the liquid level of mobile aluminium liquid at the one end that chute 2 is close to heat preservation stove 1, transmit the controller for electric cabinet 7, as the foundation of supplementary judgement. By the arrangement of the first displacement sensor 808 and the second displacement sensor 809, a setpoint of the liquid level can be detected there.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the scope of the present invention is defined by the claims.
Claims (10)
1. A liquid level measurement and control system for a front box of a casting and rolling machine is characterized by comprising a liquid level measuring mechanism (5), a furnace mouth flow regulating mechanism (6) and an electric cabinet (7);
the liquid level measuring mechanism (5) is arranged on a front box (3) at the front end of a casting and rolling machine (4), the liquid level measuring mechanism (5) comprises a support assembly, an angular displacement encoder (503), a first vertical rod (504), a first cross rod (505) and a first buoy (507), the angular displacement encoder (503) is supported on one side above the front box (3) through the support assembly, the middle position of the first cross rod (505) is connected to a middle shaft of the angular displacement encoder (503), the bottom end of the first vertical rod (504) is connected with the first buoy (507) and vertically arranged in the front box (3), the top end of the first vertical rod (504) is connected to the inner end of the first cross rod (505) through a pin shaft, and the outer end of the first cross rod (505) is provided with a first balancing weight (5052) for balance adjustment; the angular displacement encoder (503) is electrically connected with the controller input end of the electric cabinet (7) arranged beside;
the furnace mouth flow adjusting mechanism (6) comprises an electric push rod (602), a connecting swing arm (603), a supporting assembly and an adjusting blocking rod (606), wherein a bottom pin shaft of the electric push rod (602) is installed, a working end of the electric push rod is connected with a rocking handle part of the connecting swing arm (603), a transverse rod part of the connecting swing arm (603) is rotatably supported above the launder (2) through the supporting assembly, an adjusting seat (6031) is arranged at the middle position of the transverse rod part, the adjusting blocking rod (606) is connected to the adjusting seat (6031) through a pin shaft, and a plug (6061) at the front end of the adjusting blocking rod (606) can plug a liquid outlet hole of the heat preservation furnace (1); the electric push rod (602) is electrically connected to the electric cabinet (7).
2. The cast-rolling mill forebox liquid level measurement and control system of claim 1, characterized in that: the support assembly comprises a first pin shaft seat (501) and a swing arm (502), the bottom of the first pin shaft seat (501) is fixedly connected to the rack of the casting and rolling machine (4), one end of the swing arm (502) is connected with the first pin shaft seat (501) through a pin shaft, and an angular displacement encoder (503) is arranged at the top of the other end of the swing arm (502).
3. The cast-rolling mill forebox liquid level measurement and control system of claim 2, characterized in that: the liquid level measuring mechanism (5) further comprises a first bearing seat (506), a rotating shaft is installed in the first bearing seat (506), the rotating shaft is coaxially connected with a middle shaft of the angular displacement encoder (503), and the shaft end of the rotating shaft is fixedly connected to the middle position of the first cross rod (505).
4. The cast-rolling mill forebox liquid level measurement and control system of claim 3, characterized in that: be provided with stop screw (5061) on the terminal surface of first bearing frame (506), stop screw (5061) quantity is two, two stop screw (5061) set up respectively rotation axis both sides restriction the swing range of first horizontal pole (505).
5. The cast-rolling mill forebox liquid level measurement and control system of claim 1, characterized in that: the motor of the electric push rod (602) is a servo motor or a variable frequency motor, and the motor is electrically connected to a servo or variable frequency driver in the electric cabinet (7).
6. The cast-rolling mill forebox liquid level measurement and control system of claim 5, characterized in that: the support assembly comprises second bearing seats (604) and connecting seats (605), the two second bearing seats (604) are respectively provided with the connecting swing arm (603) above the side wall of the launder (2), the second bearing seats (604) are arranged at the top end of the connecting seats (605), the inner plate of the connecting seats (605) is connected to a welding block (201) through bolts, and the welding block (201) is welded on the side wall of the launder (2); the bottom end of the electric push rod (602) is connected to a supporting frame beside through a second pin shaft seat (601) in a pin joint mode.
7. The system for measuring and controlling the liquid level of the front box of the casting and rolling machine according to any one of claims 1 to 6, is characterized in that: the device also comprises a launder liquid level monitoring mechanism (8), wherein the launder liquid level monitoring mechanism (8) is arranged at one end of the launder (2) close to the heat preservation furnace (1);
the launder liquid level monitoring mechanism (8) comprises a support (801), a second cross rod (802), a fulcrum block (803), a second upright rod (806) and a second float (807), wherein the support (801) is fixedly connected to the side wall of the launder (2), the second cross rod (802) is swingably connected to the top of a fulcrum bottom support (8011) in the middle of the support (801) through the fulcrum block (803) which is penetrated and installed in the middle, one end of the second cross rod (802) is connected with the other end of the second upright rod (806) through a pin shaft, an induction baffle (8021) is arranged at one side of the induction baffle (8021), and the support (801) is provided with a displacement sensor which is electrically connected to the controller input end of the electric cabinet (7); the second vertical rod (806) is vertically arranged in the runner (2) and the bottom end of the second vertical rod is connected with the second buoy (807).
8. The cast-rolling mill forebox liquid level measurement and control system of claim 7, characterized in that: the induction flange (8021) is a steel plate in a right-angle edge shape, the displacement sensor comprises a first displacement sensor (808) and a second displacement sensor (809), the first displacement sensor (808) is matched with a lower flat plate edge of the induction flange (8021), and the second displacement sensor (809) is matched with a vertical plate edge of the induction flange (8021).
9. The cast-rolling mill forebox liquid level measurement and control system of claim 8, characterized in that: the first displacement sensor (808) is specifically an inductive sensor, and the second displacement sensor (809) is specifically a proximity switch.
10. A method for measuring and controlling the liquid level of a front box of a casting and rolling machine is characterized by comprising the following steps: the casting and rolling machine front box liquid level measurement and control system of any one of claims 1-9 is applied to carry out closed-loop control on the front box liquid level, an angular displacement encoder is used for collecting the front box liquid level position, and an electric push rod is controlled to act to adjust the supply flow of aluminum liquid.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011577487.1A CN112698677A (en) | 2020-12-28 | 2020-12-28 | System and method for measuring and controlling liquid level of front box of casting and rolling machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011577487.1A CN112698677A (en) | 2020-12-28 | 2020-12-28 | System and method for measuring and controlling liquid level of front box of casting and rolling machine |
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| CN112698677A true CN112698677A (en) | 2021-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011577487.1A Withdrawn CN112698677A (en) | 2020-12-28 | 2020-12-28 | System and method for measuring and controlling liquid level of front box of casting and rolling machine |
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Cited By (1)
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Application publication date: 20210423 |