High-precision positioning control system of dry quenching elevator

Abstract

The invention relates to the field of high-precision positioning control, in particular to a high-precision positioning control system for a coke dry quenching hoister, which is characterized in that a hoister 3 is lifted to a derrick upper limit 6 along a lifting derrick 1 under the action of a variable frequency motor, is positioned on a rail of a cross beam 2 at the moment, moves to a corresponding coke dry quenching furnace top under the action of a transverse moving device, and is positioned on the derrick upper limit 6 after being aligned and determined; under the action of the lifting device, the elevator 3 descends into the dry quenching furnace for coke loading, after coke loading is completed, the elevator 3 ascends to the upper limit of the dry quenching furnace under the action of the lifting device, at the moment, the elevator 3 is located on a rail of the cross beam 2, and the elevator 3 moves to the upper limit 6 of the derrick under the action of the transverse moving device; the hoister 3 descends to the ground along a rail of the hoisting derrick 1 under the action of a variable frequency motor; the number of the dry quenching furnaces is multiple, and a range induction limiting device is arranged on the cross beam 2 and corresponds to the front of each dry quenching furnace.

Description

Technical Field

[0001] The invention relates to the field of high-precision positioning control, in particular to a high-precision positioning control system for a dry coke quenching elevator. Background Art

[0002] In the dry coke quenching process, the red coke pushed out from the carbonization chamber is received by the round rotating coke can on the coke can car (some dry coke quenching processes are designed as square coke cans), and the coke can car is towed by an electric locomotive to the bottom of the dry coke quenching process lifting derrick, and the coke can is lifted to the top of the lifting derrick by the hoist; in the process of the hoist moving horizontally toward the top of the dry quenching furnace (under the action of the transverse movement device), the furnace cover connected to the loading device is automatically opened by the electric cylinder, and the coke loading funnel is automatically placed on the upper part of the dry quenching furnace; the hoist is received by the hoisting platform of the loading device, and in the process of the lifting device descending, the bottom gate of the hoist is automatically opened to start loading the red coke; after the red coke is loaded, the hoist is automatically lifted and the coke can is sent to the empty hoist trolley at the bottom of the lifting derrick, during which the loading device automatically runs to close the furnace cover.

[0003] After the hoist runs to the upper limit of the derrick, the hoist moves horizontally to the top of the dry quenching furnace and moves to the deceleration zone, that is, the sensing range of the range sensing limit device (point A). The frequency of the variable frequency motor begins to decrease (such as from 40Hz to 4Hz). After the deceleration time (such as 10s), the hoist is just at the top of the dry quenching furnace (point B). After the limit sensor senses that the hoist has reached the set position (point B), the function of point B is to feedback the centering position of the hoist and the loading device, and start automatic coking. Due to the large sensing range of the range sensing limit device, it may also receive an erroneous centering signal in the case of external interference, resulting in an accident. In addition, the track is relatively slippery in rainy and snowy weather. After the hoist runs to point A, it immediately decelerates. It is very easy to rush through point B on the slippery track, but it is still in the sensing area of ​​the limit sensor. In this way, there is an inaccurate alignment and an accident of red coke overflow occurs. Although a wiper is installed on the hoist track, the effect is not obvious. In addition, the range sensing limiter on the track (beam) is a capacitive sensing limiter, and the sensing part is the upper and side sensing areas. On rainy days, the side sensing area of ​​the limiter may be sticky with coke powder and rust powder, which interferes with the sensing area of ​​the limiter, causing the limiter to generate false sensing signals in advance, causing the elevator to stop in advance to load coke, and it is also easy to cause the accident of red coke overflow. Summary of the invention

[0004] The technical problem to be solved by the present invention is: how to achieve accurate positioning and parking of the elevator at the top of the dry quenching furnace, so as to avoid accidents caused thereby.

[0005] The technical solution adopted by the present invention is: a high-precision positioning control system for a dry coke quenching hoist, wherein the hoist 3 is lifted to the upper limit position 6 of the derrick along the lifting frame 1 under the action of a variable frequency motor, at which time the hoist 3 is on the track of the beam 2, and the hoist 3 is moved to the corresponding dry quenching furnace top under the action of a transverse movement device. After the alignment is determined, the hoist 3 is lowered to the dry quenching furnace for coke loading under the action of a lifting device. After the coke loading is completed, the hoist 3 is raised to the upper limit position of the dry quenching furnace under the action of a lifting device, at which time the hoist 3 is on the track of the beam 2, and the hoist 3 is moved to the upper limit position 6 of the derrick under the action of a transverse movement device, and the hoist 3 is lowered to the ground along the track of the lifting frame 1 under the action of a variable frequency motor; there are multiple dry quenching furnaces, and a range sensing limit device is provided in front of each dry quenching furnace on the beam 2, and a limit sensor is provided at the position of each dry quenching furnace on the beam 2, and a precise position limit device is installed on the beam 2 between the range sensing limit device and the limit sensor.

[0006] The overall control of the present invention is performed by PLC.

[0007] The range sensing limit device is a capacitive sensing limit device and the limit sensing range is 300mm*150mm.

[0008] The positioning accuracy of the precise position limiting device is within 30mm*30mm.

[0009] The limit sensor is a proximity switch.

[0010] The position of the lower limit plate of the range sensing limit device is at a position that cannot be affected by coke powder and dust accumulation.

[0011] After the hoist is aligned, the APS (hydraulic clamping device) clamps the hoist and sends an "APS clamped signal" to the hoist. The hoist performs self-inspection and generates an "allowed lifting signal" after the self-inspection is normal. After receiving the "APS clamped signal" and "allowed lifting signal", the hoist starts to rise. At the same time, the hook hooks the coke drum under the action of gravity and starts to lift. The hoist stops after it is lifted to the upper limit 6 of the derrick, and the furnace number and position of the dry quenching furnace to be loaded are determined according to the dry quenching furnace material level. The hoist 3 moves to the corresponding dry quenching furnace top under the action of the transverse moving device. When the transverse moving device starts to move, the transverse moving device moves to the sensing range of the corresponding range sensing limit device After the surrounding, start to decelerate and decelerate for the set time. When the transverse moving device moves to the corresponding precise position limit device, check whether the speed of the transverse moving device is the set speed. If it is the set speed, after the limit sensor detects that the transverse moving device has reached the set position, start the coking action, and the loading device of the corresponding dry quenching furnace is opened. The elevator 3 starts to descend to load coke under the action of the lifting device. After the coking is completed, the elevator 3 returns to the initial position along the original route, and then moves to the standby position to wait for the next round of cycle. When the transverse moving device moves to the corresponding precise position limit device and checks that the speed of the transverse moving device is not the set speed or the limit sensor detects that the transverse moving device has not reached the set position, stop the coking action.

[0012] When the hoist moves from the upper limit 6 of the derrick to the corresponding CDQ furnace top, the actual travel percentage is calculated by (actual travel value - set minimum value) ÷ (maximum travel value - set minimum value) × 100%, and finally multiplied by the travel track (i.e. beam track), which is the current hoist position. This value is displayed on the display interface for staff to confirm. When the value does not correspond to the hoisting derrick 1, range sensing limit device, limit sensor, precise position limit device, and CDQ furnace position, coke loading is not allowed.

[0013] A mechanical positioning device is installed on the loading device of the CDQ furnace to ensure that the receiving elevator reaches the set position before the loading device is opened.

[0014] The beneficial effects of the present invention are as follows: the present invention is an improvement on the prior art, adding a precise position limit device (such as a proximity switch), and enhancing the positioning accuracy through the positioning of four-in-one (range sensing limit device, limit sensor, precise position limit device, current elevator position display), avoiding the risk of production accidents such as red coke external loading and overflow. At the same time, a mechanical in-place feedback signal is added to the loading device to ensure the accuracy of the actual position of the loading device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the embodiment; Figure 2 It is a schematic diagram of the hoist transmission system of the embodiment; Among them, 1. lifting derrick, 2. crossbeam, 3. hoist, 4. first dry quenching furnace, 5. second dry quenching furnace, 6. upper limit of derrick, 7. upper limit of first dry quenching furnace, 8. upper limit of second dry quenching furnace, 9. first limit sensor, 10. second limit sensor, 11. third limit sensor, 12. first range sensing limit device, 13. second range sensing limit device. DETAILED DESCRIPTION

[0016] like Figure 1 As shown, this embodiment is described by taking two CDQ furnaces as an example, and other multiple CDQ furnaces are processed in the same way.

[0017] The dry quenching coke hoist of a certain enterprise uses Siemens s120 series inverters, and adopts a set of rectifier feedback system with a hoist inverter unit (controlling 2 335kw hoist motors) and a travel inverter unit (controlling 1 75kw travel motor). The hoist has a total of 4 hoist motors and 2 travel motors, using two sets of rectifier feedback devices, two sets of hoist inverter units and two sets of travel inverter units. Figure 2 shown.

[0018] In the prior art, the elevator is usually in full-automatic operation mode and does not require human intervention. Working principle: After the coke tank car is aligned, the APS clamps the coke tank car. After the elevator receives the "APS clamped signal" and the "lifting allowed signal", the elevator begins to rise slowly. At the same time, the hook hooks the coke tank under the action of gravity and begins to lift. After lifting to the upper limit of lifting (upper limit of the derrick), the loading furnace number is judged by the material levels of the two dry quenching furnaces, and the lifting stops and starts to move. After moving to the top of the corresponding dry quenching furnace, it senses the centering position signal (the signal from the limit sensor) and then descends to load coke. After 20 seconds of coke loading, it is automatically lifted to the upper limit, and finally runs to the lifting derrick and descends to the standby position to wait for the next cycle. There are many problems with the current elevator positioning method, which are as follows: After the elevator runs to the furnace area, the original stop brush of the elevator has a large range in the sensing range. After the elevator brush reaches the limit at point A, the inverter starts to decelerate, and the speed is reduced from 40Hz to 4Hz. The ramp deceleration time is 10s. At this time, it just reaches point B to stop. The function of point B is to feedback the centering position of the elevator and the loading device. After receiving the feedback, the PLC program starts to automatically focus. Due to the large position, the elevator may also receive the centering signal (wrong signal) in the case of external interference, resulting in an accident.

[0019] The elevator track is slippery in rainy and snowy weather. After the elevator runs to point A, it immediately slows down. It is very easy to rush through point B on the slippery track, but it is still within the sensing area of ​​the brush. This will cause the elevator to be inaccurately positioned and cause the accident of red coke overflow. Although a wiper is installed on the elevator track, the effect is not obvious.

[0020] The inductive limiter on the rail platform is a capacitive inductive limiter, and the inductive part is the upper part and the side of the upper inductive area. On rainy days, there is coke powder and rust powder on the limiter bracket. After the three are mixed, they interfere with the inductive area of ​​the limiter, causing the limiter to generate false inductive signals in advance, causing the elevator to stop in advance to load coke, and it is also easy to cause the accident of red coke overflow.

[0021] Specific plan Install precise positioning limiter (precise position limiter) 2m in front of the original centering limiter (limit sensor of the first CDQ furnace and the second CDQ furnace, Figure 1 Not shown in the figure), the limit sensing area is installed downward to ensure that coke dust and rust and other materials cannot accumulate on the limit working area. The positioning brush (lower limit piece) on the hoist is the same width as the limit (upper limit piece), and the positioning accuracy is below 30mm. Under normal circumstances, there is no interference and no accidents. After the hoist reaches 0 speed after 10s of running deceleration time, it stops here, just in time with this limit sensing, achieving accurate positioning.

[0022] Adjust the installation position of the center limit (lower limit piece of the range sensing limit device) so that the yellow sensing part of the limit protrudes more than 10mm from the bracket to ensure that coke dust, rust and other substances do not interfere with the limit working area. The sensing range of this limit brush is 300mm×150mm, and its function is to command the hoist to stop. When the hoist runs to this limit, the inverter starts to decelerate and stop, and the speed gradually drops from 40Hz to 0Hz after 10s deceleration time.

[0023] The encoder value is calibrated with the travel centering data. Read the elevator travel encoder value PID516. When the elevator moves from the upper limit (6) of the derrick to the corresponding dry quenching furnace top, the actual travel percentage is calculated by (actual travel value - set minimum value) ÷ (maximum travel value - set minimum value) × 100%, and finally multiplied by the total length of the travel track (i.e., beam track) of 45.6 meters, which is the current elevator position. This value is displayed on the display interface for staff to confirm. When the value does not correspond to the hoist derrick 1, range sensing limit device, limit sensor, precise position limit device, and dry quenching furnace position, coke loading is not allowed.

[0024] In addition to the original signal for opening the loading device, a new set of mechanical feedback signals (i.e., the signal for installing the mechanical positioning device) is added to ensure that after the loading device reaches the specified position, the "loading device is opened" command is sent. This condition is connected in series with the lowering condition of the elevator to prevent the elevator from dropping the coke can.

[0025] In one embodiment, a high-precision positioning control system for a dry coke quenching elevator includes a PLC, an elevator frame 1, a crossbeam 2, an elevator, and a variable frequency motor. The elevator frame 1 is a track for the elevator to move up and down, and the crossbeam 2 is a high-altitude beam for the elevator to move horizontally.

[0026] In one embodiment, after the elevator is aligned, the APS (hydraulic clamping device) clamps the elevator and sends an "APS clamped signal" to the elevator. The elevator performs self-inspection and generates an "allowed lifting signal" after the self-inspection is normal. After the elevator receives the "APS clamped signal" and the "allowed lifting signal", the elevator starts to rise. At the same time, the hook hooks the coke drum under the action of gravity and starts to lift. The elevator stops lifting after it reaches the upper limit 6 of the derrick. At this time, the first limit sensor 9 receives the signal, and the PLC determines the furnace number and position of the dry quenching furnace that needs to be loaded according to the dry quenching furnace material level. In one embodiment, the dry quenching furnace that needs to be loaded is the first dry quenching furnace 4 (or the second dry quenching furnace 5), and the elevator 3 needs to be moved to the top of the first dry quenching furnace (or the top of the second dry quenching furnace) under the action of the transverse movement device (frequency conversion motor). When the transverse movement device starts to move, the transverse movement device moves to the first range sensing limit device 7 After the transverse device reaches the sensing range of the first precise position limit device (or the second range sensing limit device 8), it starts to decelerate and decelerates for a set time (such as 10s). When the transverse device moves to the first precise position limit device (on the beam 2 between the first range sensing limit device and the first limit sensor), it checks whether the speed of the transverse device is the set speed (or checks the time after starting deceleration). If it is the set speed, after the first limit sensor 7 detects that the transverse device has reached the set position, the coking action starts, the loading device of the corresponding dry quenching furnace is opened, and the hoist 3 starts to descend to load coke under the action of the lifting device. After the coking is completed, the hoist 3 returns to the initial position along the original route, and then moves to the standby position to wait for the next cycle. When the transverse device moves to the corresponding precise position limit device and checks that the speed of the transverse device is not the set speed or the limit sensor detects that the transverse device has not reached the set position, the coking action is stopped.

[0027] The range sensing limit device is a capacitive sensing limit device and the limit sensing range is 300mm*150mm.

[0028] The positioning accuracy of the precise position limiting device is within 30mm*30mm.

[0029] The limit sensor is a proximity switch.

[0030] In one embodiment, the first CDQ furnace upper limit 7, the second CDQ furnace upper limit 8, and the first limit sensor 9 are the same upper limit sensor (which can be a proximity switch, etc.) installed on the elevator. When the elevator is on the beam 7, the upper limit is triggered.

Claims

1. A high-precision positioning control system for a dry coke quenching elevator, characterized in that: The hoist (3) carries the coke can and is lifted to the upper limit position (6) of the hoist frame (1) under the action of the variable frequency motor. At this time, the hoist (3) is on the track of the crossbeam (2). The hoist (3) moves to the corresponding dry quenching furnace top under the action of the transverse moving device. After the alignment is determined, the hoist (3) is lowered to the dry quenching furnace under the action of the lifting device to load the coke. After the coke loading is completed, the hoist (3) is raised to the upper limit position of the dry quenching furnace under the action of the lifting device. At this time, the hoist (3) is on the crossbeam (2). On the track, the hoist (3) moves to the upper limit position (6) of the derrick under the action of the transverse movement device, and the hoist (3) is lowered to the ground along the track of the lifting derrick (1) under the action of the variable frequency motor; there are multiple dry quenching furnaces, and a range sensing limit device is provided on the crossbeam (2) in front of each dry quenching furnace, and a limit sensor is provided on the crossbeam (2) at the position corresponding to each dry quenching furnace, and a precise position limit device is installed on the crossbeam (2) between the range sensing limit device and the limit sensor.

2. A high-precision positioning control system for a dry coke quenching elevator according to claim 1, characterized in that: The range sensing limit device is a capacitive sensing limit device and the limit sensing range is 300mm*150mm.

3. A high-precision positioning control system for a dry coke quenching elevator according to claim 1, characterized in that: The positioning accuracy of the precise position limiting device is within 30mm*30mm.

4. A high-precision positioning control system for a dry coke quenching elevator according to claim 1, characterized in that: The limit sensor is a proximity switch.

5. The high-precision positioning control system for a dry coke quenching elevator according to claim 1 is characterized in that: The position of the lower limit plate of the range sensing limit device is at a position that cannot be affected by coke powder and dust accumulation.

6. A high-precision positioning control system for a dry coke quenching elevator according to claim 1, characterized in that: After the elevator is aligned, the APS (hydraulic clamping device) clamps the elevator and sends an "APS clamped signal" to the elevator. The elevator performs self-inspection and generates an "allowed lifting signal" after the self-inspection is normal. After the elevator receives the "APS clamped signal" and "allowed lifting signal", it starts to rise. At the same time, the hook hooks the coke drum under the action of gravity and starts to lift. After the elevator is lifted to the upper limit (6) of the derrick, the lifting stops and the furnace number and position of the dry quenching furnace to be loaded are determined according to the dry quenching furnace material level. The elevator (3) moves to the corresponding dry quenching furnace top under the action of the transverse moving device. When the transverse moving device starts to move, the transverse moving device moves to the sensing range of the corresponding range sensing limit device. After the traverse device is surrounded, it starts to decelerate and decelerates for a set time. When the traverse device moves to the corresponding precise position limit device, it is checked whether the speed of the traverse device is the set speed. If it is the set speed, after the limit sensor detects that the traverse device has reached the set position, the coke loading action starts, the loading device of the corresponding dry quenching furnace is opened, and the elevator (3) starts to descend to load coke under the action of the lifting device. After the coke loading is completed, the elevator (3) returns to the initial position along the original path, and then moves to the standby position to wait for the next cycle. When the traverse device moves to the corresponding precise position limit device, it is checked that the speed of the traverse device is not the set speed or the limit sensor detects that the traverse device has not reached the set position, the coke loading action is stopped.

7. A high-precision positioning control system for a dry coke quenching elevator according to claim 1, characterized in that: When the hoist moves from the upper limit (6) of the derrick to the corresponding CDQ furnace top, the actual travel percentage is calculated by (actual travel value - set minimum value) ÷ (maximum travel value - set minimum value) × 100%, and finally multiplied by the travel track (i.e., beam track) to obtain the current hoist position. This value is displayed on the display interface for staff to confirm. When the value does not correspond to the hoist derrick (1), the range sensing limit device, the limit sensor, the precise position limit device, and the CDQ furnace position, the coke loading action is not allowed.

8. The high-precision positioning control system for a dry coke quenching elevator according to claim 1, characterized in that: A mechanical positioning device is installed on the loading device of the CDQ furnace to ensure that the receiving elevator reaches the set position before the loading device is opened.

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