CN110203828B - Method for hoisting plate blank by traveling crane - Google Patents
Method for hoisting plate blank by traveling crane Download PDFInfo
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- CN110203828B CN110203828B CN201810168183.6A CN201810168183A CN110203828B CN 110203828 B CN110203828 B CN 110203828B CN 201810168183 A CN201810168183 A CN 201810168183A CN 110203828 B CN110203828 B CN 110203828B
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- slab
- roller way
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- side pressing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/16—Applications of indicating, registering, or weighing devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/48—Automatic control of crane drives for producing a single or repeated working cycle; Programme control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C2700/00—Cranes
- B66C2700/08—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Control Of Conveyors (AREA)
- Control And Safety Of Cranes (AREA)
Abstract
The invention discloses a method for hoisting a plate blank by a travelling crane, which comprises the following steps that firstly, when the plate blank is conveyed to an inlet from a roller way, a PLC controller controls the roller way to stop running; step two, the upper computer compares the data information of the plate blank with the data information of the next plate blank; if the difference between the data of the plate blank and the data of the following plate blank is within the allowable range, the PLC controls the traveling crane to hoist the plate blank to the upper part of the roller way and controls the roller way to start running; when a slab behind the slab is conveyed to an inlet from the roller way, the PLC controls the roller way to stop running, controls the traveling crane to place the slab on the slab behind the slab, controls the traveling crane to hoist the slab and the slab behind the slab together into a storage area, and controls the roller way to start running; if the difference of the data exceeds the allowable range, the PLC controls the travelling crane to hoist the slab to the storage area and controls the roller way to start running. By adopting the method for lifting the plate blank by the travelling crane, the efficiency of lifting the plate blank by the travelling crane can be improved.
Description
Technical Field
The invention relates to the field of slab hoisting control, in particular to a method for hoisting slabs by a traveling crane.
Background
In the slab production process, slabs are conveyed by a roller way and lifted to a storage area by a crane. Firstly, the slab is conveyed to an inlet of a storage area by a roller way, a PLC controller controls the roller way to stop running, controls a travelling crane to hoist the slab to the storage area, and controls the roller way to start running.
However, in the actual operation process, the traveling cranes have limited number and heavy tasks and cannot be in place in time, so that the slabs on the roller way cannot be lifted in time, and once the slabs on the continuous casting side cannot be lifted in time, the slabs have to be taken off line in advance, so that the production logistics is seriously influenced, and the production efficiency is reduced. In addition, because the slab on the roller way is sent by the steelmaking continuous casting, and because the difference exists between the casting machines, the slab which is off-line also has certain deviation in the aspect of centering with the roller way; moreover, the slab can take place the off tracking at the operation in-process, consequently, the slab that arrives storehouse district entrance is not at the center of roll table, in case the centering deviation is great, can lead to the driving to take place the phenomenon that the clamp collided the slab when snatching the slab, causes great influence to equipment.
Aiming at the problems in the prior art, the novel method for hoisting the plate blank by the travelling crane is of great significance.
Disclosure of Invention
In order to solve the problems, the invention provides a method for lifting a slab by a travelling crane, which can improve the efficiency of lifting the slab by the travelling crane and can also avoid the collision of a clamp of the travelling crane on the slab when grabbing the slab.
In order to achieve the purpose, the invention provides a method for hoisting a slab by a crane, wherein the slab is conveyed to an inlet of a storage area by a roller way, the slab is hoisted into the storage area by the crane, and the method comprises the following steps:
step one, when the plate blank is conveyed to the inlet from the roller way, the PLC controller controls the roller way to stop running;
step two, the upper computer compares the data information of the plate blank and a plate blank behind the plate blank;
if the difference between the data of the plate blank and the data of a plate blank behind the plate blank is within an allowable range, the PLC controller controls the travelling crane to hoist the plate blank to the position above the roller way and controls the roller way to start running; when a slab behind the slab is conveyed to the inlet by the roller way, the PLC controls the roller way to stop running, controls the travelling crane to place the slab on the slab behind the slab, controls the travelling crane to hoist the slab and the slab behind the slab together into the storage area, and controls the roller way to start running;
and if the difference between the data of the slab and the data of a slab behind the slab exceeds an allowable range, the PLC controls the travelling crane to hoist the slab to the storage area and controls the roller way to start running.
Preferably, the data information comprises the length and width of the slab.
Preferably, in the first step, after the roller way stops operating, the slab is centered; and in the second step, after the rear slab of the slab is conveyed to the inlet and the roller way stops running, centering the rear slab of the slab.
Further, the method adopts a centering device to center the slab, the centering device comprises two side pressing plates, the two side pressing plates are symmetrically arranged at the positions of the inlet, which are positioned at two sides of the roller way, one side of each side pressing plate, which is far away from the roller way, is connected with a driving mechanism, the driving mechanism can drive the side pressing plates to move towards and away from the slab positioned at the inlet, and when the driving mechanism drives the side pressing plates to move towards the slab positioned at the inlet, the two side pressing plates can push the slab at the inlet to center the slab at the inlet.
Further, the driving mechanism is a hydraulic driving mechanism.
Further, when the plate blank is conveyed to the inlet from the roller way, the PLC controller controls the roller way to stop running and sends a signal of the roller way stopping running to an upper computer; the upper computer calculates the high-speed displacement of the side pressing plates according to the initial distance between the two side pressing plates and the width of the plate blank, and sends the high-speed displacement to the PLC;
the PLC controls the driving mechanism to drive the two side pressing plates to move from the initial positions to the direction close to the slab at the inlet at a first speed, and then to move to the direction close to the slab at the inlet at a second speed, so that the two side pressing plates can push the slab at the inlet to center the slab at the inlet; the second speed is less than the first speed.
Further, the calculation formula of the high-speed displacement is as follows:
S＝(D-W-100)/2，
wherein S is the high-speed displacement; d is the initial distance between the two side pressing plates; w is the width of the slab at the entrance.
Furthermore, a pressure sensor is arranged between the driving mechanism and the side pressing plate, and the pressure value fed back by the pressure sensor is monitored in the process that the side pressing plate moves towards the direction of the plate blank close to the inlet;
if the pressure values fed back by the two pressure sensors are both larger than a set value and the time that the two pressure values are larger than the set value can be kept for a set time continuously, the slab at the inlet is considered to be centered, and the PLC controller controls the driving mechanism to drive the two side pressure plates to return to the initial positions;
if the pressure values fed back by the two pressure sensors are smaller than the set value or the time that the pressure values are larger than the set value cannot be kept for the set time, the driving mechanism continues to drive the two side pressing plates to move towards the direction of the plate blank close to the inlet.
According to the method for hoisting the slab by the travelling crane, whether the front slab and the rear slab can be hoisted to the storage area by the travelling crane or not is judged by comparing the length and the width of the front slab and the rear slab, so that the efficiency of hoisting the slab by the travelling crane is improved, the time for hoisting the slab by the travelling crane to the storage area is shortened, and the smoothness of production logistics is ensured. Meanwhile, the slab is centered relative to the roller way at the entrance of the storage area by arranging the centering device, so that the slab is prevented from being collided by a travelling crane clamp when the slab is grabbed, and equipment is prevented from being damaged; further, by setting the high-speed displacement of the side pressing plates, the efficiency of slab centering can be improved, and the production efficiency is further improved.
Drawings
FIG. 1 is a schematic diagram of the distribution of parts in a slab warehouse of the present invention;
fig. 2 is a flow chart of the method for lifting slabs by the travelling crane.
Detailed Description
The structure, operation, and the like of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, which shows a schematic distribution diagram of each part in a slab warehouse, slabs produced by a continuous casting machine are conveyed to the slab warehouse by a roller way 3, the slab warehouse comprises a plurality of warehouse areas 2 for storing slabs and a plurality of traveling cranes 1 for lifting slabs, and the traveling cranes 1 lift slabs on the roller way 3 to different warehouse areas 2 according to needs.
In order to improve the lifting efficiency of the travelling crane 1, the method for lifting the plate blank by the travelling crane comprises the following steps:
step one, when the slab is conveyed to an inlet of the reservoir area 2 from the roller way 3, the PLC controls the roller way 3 to stop running. The position of the thick frame 4 in fig. 1 is the entrance of the reservoir area 2. Judging whether the plate blank reaches the inlet of the reservoir area 2 can be judged by various methods, and can be realized by adopting conventional technical means, for example, a grating 6 can be arranged on the front edge of the inlet, when the head of the plate blank reaches the front edge of the inlet and is detected by the grating 6, the plate blank is judged to reach the inlet of the reservoir area 2, and at the moment, the PLC controller controls the roller way 3 to stop running and sends a signal for stopping running of the roller way 3 to an upper computer.
And step two, judging whether the slab and a slab behind the slab can be lifted into the storage area 2 by the crane 1. Specifically, the upper computer reads the data information of a slab behind the slab, and compares the data information of the slab with the data information of a slab behind the slab;
if the difference between the data of the plate blank and the data of the plate blank behind the plate blank is within the allowable range, the PLC controller controls the traveling crane 1 to hoist the plate blank to the position above the roller way 3 so as to wait for the plate blank behind the plate blank to be in place, and controls the roller way 3 to start running; when a plate blank behind the plate blank is conveyed to an inlet from the roller way 3, the PLC controls the roller way 3 to stop running, controls the travelling crane 1 to put the plate blank (namely the plate blank positioned above the roller way 3 at the moment) behind the plate blank (namely the plate blank positioned at the inlet at the moment), controls the travelling crane 1 to lift and convey the two plate blanks into the storage area 2, and controls the roller way 3 to start running;
if the difference between the data of the plate blank and the data of the plate blank behind the plate blank exceeds the allowable range, the PLC controller controls the travelling crane 1 to directly hoist the plate blank to the storage area 2, controls the roller way 3 to start running, and then executes the steps one to two on the subsequent plate blank.
The data information of the slab includes the length and the width of the slab, the data are stored in the upper computer, the allowable range can be set according to the grabbing capacity of the clamp of the traveling crane 1, for example, the difference between the lengths of the front and the rear slabs is less than 2500mm, and the difference between the widths is less than 50 mm.
In order to avoid the phenomenon that the clamp of the travelling crane 1 collides the slab due to the misalignment of the slab, the slab can be centered before the clamp grabs the slab, even if the center line of the slab and the center line of the roller way 3 are parallel in a vertical plane, specifically, in the first step, after the roller way 3 stops operating, the slab is centered; and step two, after the rear slab of the slab is conveyed to the inlet and the roller way 3 stops running, centering the rear slab of the slab.
As shown in fig. 1, in the crane lifting method of the present invention, a centering device (not shown) is used to center the slab, the centering device includes two side pressing plates 5, the two side pressing plates 5 are symmetrically disposed at the inlet at two sides of the roller way 3, one side of the side pressing plate 5 away from the roller way 3 is connected to a driving mechanism, the driving mechanism can drive the side pressing plates 5 to move towards and away from the slab at the inlet, and when the driving mechanism drives the side pressing plates 5 to move towards the slab at the inlet, the two side pressing plates 5 can push the slab so as to center the slab at the inlet relative to the roller way 3. Preferably, the drive mechanism is selected as a hydraulic drive mechanism, and a piston rod 7 of the hydraulic drive mechanism is connected with the side pressure plate 5.
In order to improve the slab centering efficiency, the process that the side pressing plate 5 moves towards the slab close to the inlet can be divided into two sections, namely a high-speed moving section and a low-speed moving section, wherein in the high-speed moving section, the side pressing plate 5 moves towards the slab close to the inlet at a higher speed so as to improve the slab centering efficiency at the inlet; in the low-speed moving section, the side pressing plates 5 continue to move towards the direction close to the slab at the inlet at a lower speed, so that the impact of the high-speed moving side pressing plates 5 on the slab at the inlet is avoided.
Specifically, when the plate blank is conveyed to an inlet from the roller way 3, the PLC controls the roller way 3 to stop running and sends a signal of the roller way 3 stopping running to the upper computer; the upper computer calculates the high-speed displacement of the side pressing plates 5 according to the initial distance between the two side pressing plates 5 and the width of the plate blank, and sends the high-speed displacement to the PLC;
the PLC controls the driving mechanism to drive the two side pressing plates 5 to move at a high speed from the initial positions in the direction close to the plate blank at the inlet at a first speed, and then move in the direction close to the plate blank at the inlet at a second speed, so that the two side pressing plates 5 can push the plate blank at the inlet to enable the plate blank at the inlet to be centered relative to the roller way 3. Wherein, the high-speed displacement is the displacement of the high-speed moving section of the side pressure plate 5, and the second speed is less than the first speed.
Preferably, the calculation formula of the high-speed displacement is:
S＝(D-W-100)/2，
wherein S is high-speed displacement; d is the initial distance between the two side pressing plates 5; w is the width of the slab at the entrance. Obviously, if the value of the high-speed displacement S is smaller than 0, the value of 0 is adopted, that is, the alignment between the slab at the inlet and the roller table 3 can be rapidly completed by directly moving at the second speed without high-speed movement because the distance between the side pressure plate 5 and the slab at the inlet is too short.
In order to be able to judge whether the slab at the inlet is centered in time, a pressure sensor may be disposed between the driving mechanism and the side pressing plate 5, specifically, a pressure sensor (not shown in the figure) may be connected between the piston rod 7 and the side pressing plate 5, and a pressure value fed back by the pressure sensor is monitored during the process that the side pressing plate 5 moves towards the slab at the inlet;
if the pressure values fed back by the two pressure sensors are both larger than the set value and the time that the pressure values are larger than the set value can be kept for the set time continuously, the slab at the inlet is considered to be centered, and the PLC controls the driving mechanism to drive the two side pressing plates 5 to return to the initial positions.
If the pressure values fed back by the two pressure sensors are smaller than the set value or the time that the pressure values are larger than the set value cannot be kept for the set time, the driving mechanism continues to drive the two side pressing plates 5 to move towards the direction of the plate blank close to the inlet.
The set value and the set time may be set empirically, and for example, the set value may be set to 10 tons and the set time may be set to 3 seconds.
According to the method for hoisting the slab by the travelling crane, whether the slab can be hoisted to the storage area 2 by the travelling crane 1 or not is judged by comparing the lengths and the widths of the front slab and the rear slab, so that the efficiency of hoisting the slab by the travelling crane 1 is improved, the time for hoisting the slab into the storage by the travelling crane 1 is shortened, and the smoothness of production logistics is ensured. Meanwhile, the slab is centered relative to the roller way 3 at the entrance of the storage area 2 by arranging the centering device, so that the slab is prevented from being collided by a clamp of the travelling crane 1 when the slab is grabbed, and equipment is prevented from being damaged; further, by setting the high-speed displacement of the side platen 5, the efficiency of slab centering can be improved, and the production efficiency can be further improved.
The following describes a specific flow of the method for lifting slabs by the traveling crane 1 according to the present invention, taking four slabs as an example, with reference to fig. 2.
The data information of the four slabs is shown in the following table:
| serial number | Length of | Width of |
| 1 | 95000 | 1300 |
| 2 | 95000 | 1300 |
| 3 | 95000 | 1000 |
| 4 | 95000 | 900 |
The four plate blanks are sequentially conveyed by a roller way 3 according to the sequence of the serial numbers 1, 2, 3 and 4, the initial distance between two side pressing plates 5 is 1580mm, the first speed is 200mm/s, the second speed is 50m/s, and the concrete flow of the traveling crane 1 for hoisting the four plate blanks is as follows:
step A, conveying a first plate blank to an inlet of a storage area 2 from a roller way 3, controlling the roller way 3 to stop running by a PLC (programmable logic controller), and sending a signal of stopping running of the roller way 3 to an upper computer;
step B, the upper computer calculates the high-speed displacement S of the side pressure plates 5 to be (1580-;
step C, the PLC controls the driving mechanism to drive the two side pressing plates 5 to move 90mm from the initial position to the direction close to the first plate blank at the speed of 200mm/s, and then the two side pressing plates continue to move at the speed of 50mm/s, in the process, if the pressure values fed back by the two pressure sensors are larger than 10 tons and the time that the two pressure values are larger than 10 tons can be continuously kept for 3 seconds, the first plate blank is considered to be centered relative to the roller way 3, and the PLC controls the driving mechanism to drive the two side pressing plates 5 to return to the initial position at the speed of 200 mm/s;
d, judging whether the first plate blank and the second plate blank can be lifted to a storage area 2 by the crane 1 together, comparing the length and the width of the first plate blank and the second plate blank by the upper computer, wherein the length difference between the first plate blank and the second plate blank is 0 and less than 2500mm, and the width difference between the first plate blank and the second plate blank is 0 and less than 50mm, considering that the first plate blank and the second plate blank can be combined, namely the first plate blank and the second plate blank can be lifted to the storage area 2 together by the crane 1, controlling the crane 1 to lift the first plate blank to a position 1m above the roller way 3 by the PLC controller to wait for the second plate blank to be in place, and controlling the roller way 3 to start to operate by the PLC controller so as to convey the second plate blank;
e, conveying a second plate blank to an inlet from the roller way 3, controlling the roller way 3 to stop running by the PLC, and sending a signal of stopping running of the roller way 3 to an upper computer;
step F, the upper computer calculates the high-speed displacement S of the side pressure plates 5 to be (1580-;
g, the PLC controls the driving mechanism to drive the two side pressing plates 5 to move 90mm from the initial positions to the direction close to the second plate blank at the speed of 200mm/s, and then the two side pressing plates continue to move at the speed of 50mm/s, in the process, if the pressure values fed back by the two pressure sensors are larger than 10 tons and the time that the two pressure values are larger than 10 tons can be continuously kept for 3 seconds, the second plate blank is considered to be centered relative to the roller way 3, and the PLC controls the driving mechanism to drive the two side pressing plates 5 to return to the initial positions at the speed of 200 mm/s;
step H, the PLC controls the traveling crane 1 to place a first plate blank above the roller way 3 on a second plate blank, then controls a clamp of the traveling crane 1 to grab the first plate blank and the second plate blank at the same time, lifts the first plate blank and the second plate blank to the storage area 2, and simultaneously controls the roller way 3 to start to operate so as to convey a third plate blank to an inlet;
step I, conveying a third plate blank to an inlet of a storage area 2 from a roller way 3, controlling the roller way 3 to stop running by a PLC (programmable logic controller), and sending a signal of stopping running of the roller way 3 to an upper computer;
step J, calculating the high-speed displacement S of the side pressure plates 5 to be (1580-;
step K, the PLC controls the driving mechanism to drive the two side pressing plates 5 to move 240mm from the initial position to the direction close to the third plate blank at the speed of 200mm/s, and then the two side pressing plates continue to move at the speed of 50mm/s, in the process, if the pressure values fed back by the two pressure sensors are both larger than 10 tons and the time that the two pressure values are larger than 10 tons can be continuously kept for 3 seconds, the third plate blank is considered to be centered relative to the roller way 3, and the PLC controls the driving mechanism to drive the two side pressing plates 5 to return to the initial position at the speed of 200 mm/s;
step L, judging whether the third plate blank and the fourth plate blank can be lifted into a storage area 2 by the crane 1 or not, comparing the length and the width of the third plate blank and the fourth plate blank by the upper computer, wherein the length difference between the third plate blank and the fourth plate blank is 0 and less than 2500mm, the width difference between the third plate blank and the fourth plate blank is 100 and more than 50mm, determining that the third plate blank and the fourth plate blank cannot be combined, namely cannot be lifted into the storage area 2 by the crane 1, controlling the crane 1 to directly lift the third plate blank into the storage area 2 by the PLC, and controlling the roller way 3 to start to operate by the PLC so as to convey the fourth plate blank to an inlet;
step M, conveying a fourth plate blank to an inlet of the storage area 2 from the roller way 3, controlling the roller way 3 to stop running by the PLC, and sending a signal of stopping running of the roller way 3 to the upper computer;
step N, the upper computer calculates the high-speed displacement S of the side pressure plates 5 to be (1580-;
step O, the PLC controls the driving mechanism to drive the two side pressing plates 5 to move 290mm from the initial position to the direction close to the fourth plate blank at the speed of 200mm/s, and then the side pressing plates continue to move at the speed of 50mm/s, in the process, if the pressure values fed back by the two pressure sensors are both larger than 10 tons and the time that the two pressure values are larger than 10 tons can be continuously kept for 3 seconds, the fourth plate blank is considered to be centered relative to the roller way 3, and the PLC controls the driving mechanism to drive the two side pressing plates 5 to return to the initial position at the speed of 200 mm/s;
and step P, as the fourth slab is the last slab, the PLC controls the traveling crane 1 to directly hoist the fourth slab to the reservoir area 2, and the hoisting of the four slabs is finished.
The foregoing is merely illustrative of the present invention, and it will be appreciated by those skilled in the art that various modifications may be made without departing from the principles of the invention, and the scope of the invention is to be determined accordingly.
Claims (8)
1. A method for hoisting slabs by a crane, wherein the slabs are conveyed to an inlet of a reservoir area by a roller way, and the slabs are hoisted into the reservoir area by the crane, is characterized by comprising the following steps:
step one, when the plate blank is conveyed to the inlet from the roller way, the PLC controller controls the roller way to stop running;
step two, the upper computer compares the data information of the plate blank and a plate blank behind the plate blank;
if the difference between the data of the plate blank and the data of a plate blank behind the plate blank is within an allowable range, the PLC controller controls the travelling crane to hoist the plate blank to the position above the roller way and controls the roller way to start running; when a slab behind the slab is conveyed to the inlet by the roller way, the PLC controls the roller way to stop running, controls the travelling crane to place the slab on the slab behind the slab, controls the travelling crane to hoist the slab and the slab behind the slab together into the storage area, and controls the roller way to start running;
and if the difference between the data of the slab and the data of a slab behind the slab exceeds an allowable range, the PLC controls the travelling crane to hoist the slab to the storage area and controls the roller way to start running.
2. The method for crane handling slabs as claimed in claim 1, wherein said data information comprises the length and width of said slab.
3. The method for lifting slabs by travelling cranes as claimed in claim 1, wherein in the first step, after the roller way stops running, the slab is centered; and in the second step, after the rear slab of the slab is conveyed to the inlet and the roller way stops running, centering the rear slab of the slab.
4. The method for lifting slabs by using the travelling crane as claimed in claim 3, wherein the slab is centered by using a centering device, the centering device comprises two side pressing plates, the two side pressing plates are symmetrically arranged at the position of the inlet and located at two sides of the roller way, one side of each side pressing plate, which is far away from the roller way, is connected with a driving mechanism, the driving mechanism can drive the side pressing plates to move towards and away from the slab at the inlet, and when the driving mechanism drives the side pressing plates to move towards the slab at the inlet, the two side pressing plates can push the slab at the inlet to center the slab at the inlet.
5. The method of crane handling slabs as claimed in claim 4, wherein said drive mechanism is a hydraulic drive mechanism.
6. The method for lifting the plate blank by the travelling crane according to claim 4, wherein when the plate blank is conveyed to the inlet by the roller way, the PLC controller controls the roller way to stop running and sends a signal of the roller way stopping running to an upper computer; the upper computer calculates the high-speed displacement of the side pressing plates according to the initial distance between the two side pressing plates and the width of the plate blank, and sends the high-speed displacement to the PLC;
the PLC controls the driving mechanism to drive the two side pressing plates to move from the initial positions to the direction close to the slab at the inlet at a first speed, and then to move to the direction close to the slab at the inlet at a second speed, so that the two side pressing plates can push the slab at the inlet to center the slab at the inlet; the second speed is less than the first speed.
7. The method for lifting slabs by travelling cranes of claim 6, wherein the calculation formula of the high-speed displacement is as follows:
S＝(D-W-100)/2，
wherein S is the high-speed displacement; d is the initial distance between the two side pressing plates; w is the width of the slab at the entrance.
8. The method for lifting slabs by using the travelling crane as claimed in claim 6, wherein a pressure sensor is arranged between the driving mechanism and the side pressing plate, and the pressure value fed back by the pressure sensor is monitored during the process that the side pressing plate moves towards the direction of the slab close to the inlet;
if the pressure values fed back by the two pressure sensors are both larger than a set value and the time that the two pressure values are larger than the set value can be kept for a set time continuously, the slab at the inlet is considered to be centered, and the PLC controller controls the driving mechanism to drive the two side pressure plates to return to the initial positions;
if the pressure values fed back by the two pressure sensors are smaller than the set value or the time that the pressure values are larger than the set value cannot be kept for the set time, the driving mechanism continues to drive the two side pressing plates to move towards the direction of the plate blank close to the inlet.
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| CN201810168183.6A CN110203828B (en) | 2018-02-28 | 2018-02-28 | Method for hoisting plate blank by traveling crane |
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| CN201810168183.6A CN110203828B (en) | 2018-02-28 | 2018-02-28 | Method for hoisting plate blank by traveling crane |
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| CN110203828B true CN110203828B (en) | 2020-08-25 |
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| DE4244152C1 (en) * | 1992-12-24 | 1994-06-30 | Duerkopp Adler Ag | Overhead conveyor system with a push-out device with overload function |
| JP2000159478A (en) * | 1998-11-25 | 2000-06-13 | Okamura Corp | Suspending conveyor |
| CN204396477U (en) * | 2014-12-10 | 2015-06-17 | 宝山钢铁股份有限公司 | A kind of crane device for Wide and Thick Slab driving location |
| CN105584776B (en) * | 2016-01-05 | 2017-10-03 | 中冶东方工程技术有限公司 | A kind of slab template transport system and technique |
| CN108931975B (en) * | 2017-05-24 | 2021-06-15 | 宝山钢铁股份有限公司 | Automatic control method for two traveling vehicles in same span of hot-rolled slab warehouse |
| CN208427528U (en) * | 2018-06-24 | 2019-01-25 | 新疆八一钢铁股份有限公司 | Multilayer slab rotating roller |
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