System and method for preventing bridge crane from drawing and tipping

Abstract

The invention relates to the technical field of mechanical equipment, and provides a system and method for preventing a bridge crane from drawing a tipping machine, and the system comprises a positioner mounted on the longitudinal side surface of a longitudinal moving mechanism, and a baffle plate which is mounted on the inner side of a longitudinal running track and is the same as the tipping machine in transverse position, the position positioner is used for detecting the baffle and outputting a position positioning completion signal; the height positioner is arranged on the hoisting trolley and is used for outputting a lifting hook height safety signal when the height of the lifting hook positioned above the tipping machine is not lower than the height of the lifting lug of the molten steel tank; the clamp state detectors are mounted at positions close to clamps of the tipping machine and are used for outputting clamp unlocking signals when detecting that the clamps are released; and the controller is used for controlling the crane carriage to pull up the molten steel tank when the received three signals are judged to be effective. According to the scheme, the accuracy of judging whether the molten steel tank can be pulled up or not is improved, and the safety accident risk is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical equipment, and in particular to a system and method for preventing a bridge crane from pulling and tipping over. Background Art

[0002] The steel ladle needs to be regularly maintained or cleaned to extend its service life. When the steel ladle needs to be maintained or cleaned, the steel ladle is hung on the tilting machine on the ground by a bridge crane, and then the tilting machine changes the steel ladle from a vertical state to an inclined or horizontal state and locks it to facilitate the operator to operate. When the steel ladle is maintained or cleaned, the tilting machine is started and the steel ladle is turned back to its original vertical state. During this process, it is necessary to confirm that the steel ladle is currently in a state where it can be pulled up. Otherwise, the steel ladle is directly pulled up by the bridge crane without confirmation, which may cause the tilting machine to be pulled up at the least, or the crane beam of the bridge crane to be damaged at the worst, causing a safety accident.

[0003] During the process of starting the tilting machine and then turning the molten steel ladle to its original vertical state, the prior art generally only detects the locking device of the tilting machine. When it is detected that the locking device is unlocked, the bridge crane is commanded to pull up the molten steel ladle. This single method of judging whether the molten steel ladle can be pulled up reduces the accuracy of judging whether the molten steel ladle can be pulled up, and it is easy to cause the molten steel ladle to be pulled up by mistake due to abnormalities in the locking device or detection errors, which may also easily lead to safety accidents.

[0004] Based on this, the existing technology is in urgent need of improvement. Summary of the invention

[0005] In view of this, and in response to the problems in the prior art, the present invention provides a system and method for preventing a bridge crane from pulling and tipping over.

[0006] According to a first aspect of the present invention, a system for preventing a bridge crane from pulling out and tipping over is provided. The bridge crane comprises a longitudinal moving mechanism and a longitudinal track for movement thereof, a transverse main beam and a lifting trolley mounted thereon, and a hook is connected to the lower end of the lifting trolley. The system comprises: A position locator installed on the longitudinal side of the longitudinal moving mechanism and a baffle installed on the inner side of the longitudinal running track and at the same lateral position as the tilting machine, the position locator is used to detect the baffle and output a position positioning completion signal; A height positioner installed on the lifting trolley is used to output a hook height safety signal when it is detected that the height of the hook located vertically above the tipping machine is not lower than the height of the steel ladle lifting lug; a plurality of clamp state detectors installed in the vicinity of the clamp of the tipping machine, for outputting a clamp unlocking signal upon detecting that the clamp is released; A controller that is communicatively connected to the position locator, height locator, and multiple clamp status detectors is used to control the lifting trolley to pull up the molten steel ladle when it is determined that the position positioning completion signal, hook height safety signal, and all clamp unlocking signals are valid.

[0007] In some embodiments, the system further comprises: A wireless receiving device is installed in a distribution box in the driver's cab at one end of the transverse main beam; The wireless transmitting device is installed in a ground distribution box close to the tipping machine and is used to convert the position positioning completion signal, the hook height safety signal and the all clamp unlocking signal into corresponding wireless signals and then send them to the wireless receiving device.

[0008] In some embodiments, the controller is a PLC controller, which is installed in the power distribution box in the driver's cab and is communicatively connected with the wireless receiving device.

[0009] In some embodiments, the wireless receiving device is used to connect all the received clamp unlocking signals in series and input them into the normally open signal terminal of the PLC controller, and to connect the received position positioning completion signal and hook height safety signal in parallel and input them into the normally closed signal terminal of the PLC controller.

[0010] In some embodiments, the wireless transmitting device and the wireless receiving device are both powered by a power supply with an AC voltage of 220V.

[0011] In some embodiments, the height locator is installed at the center of the drum end cover and the drum shaft on the lifting trolley, and rotates with the drum to locate the height of the hook in real time.

[0012] In some embodiments, the baffle is mounted on the inner side of the railing of the lifting platform of the longitudinal running track and is located in a position that can be detected by the position locator.

[0013] In some embodiments, the number of the clamp state detectors is the same as the number of the clamps of the tilting machine, and a clamp state detector is installed near each clamp for detecting whether it is in a released state.

[0014] In some embodiments, the position locator is a photoelectric sensor, and the baffle is a sunshade.

[0015] According to a second aspect of the present invention, a method for preventing a bridge crane from pulling and tipping is provided, wherein the following steps are performed using any of the above-mentioned anti-bridge crane pulling and tipping machine systems: The baffle is detected by the position locator and a position positioning completion signal is output when the baffle is detected; the height of the hook located vertically above the tilting machine is detected by the height locator to be lower than the height of the steel ladle lug and a hook height safety signal is output when the height is detected to be not lower than the steel ladle lug; the plurality of clamp state detectors are used to detect whether the corresponding clamps are opened and a clamp unlocking signal is output when the corresponding clamps are detected to be released; The controller determines whether the received position positioning completion signal, hook height safety signal and all clamp unlocking signals are all valid, and in response to being valid, controls the lifting trolley to pull up the molten steel ladle.

[0016] The above-mentioned anti-bridge crane pulling and tipping machine system, the bridge crane includes a longitudinal moving mechanism and a longitudinal track for its movement, a transverse main beam and a lifting trolley installed thereon, and a hook is connected to the lower end of the lifting trolley. The system includes a positioner installed on the longitudinal side of the longitudinal moving mechanism, and a baffle installed on the inner side of the longitudinal running track and at the same transverse position as the tipping machine. The position locator is used to detect the baffle and output a position positioning completion signal, and a height locator installed on the lifting trolley is used to output a hook height safety signal when it detects that the height of the hook located vertically above the tipping machine is not lower than the height of the steel ladle lifting ear, and multiple clamp state detectors are installed in the vicinity of the clamp of the tipping machine, which are used to output a clamp unlocking signal when the clamp is detected to be released, and a controller communicatively connected to the position locator, the height locator, and the multiple clamp state detectors, which is used to control the lifting trolley to pull up the steel ladle when it is determined that the received position positioning completion signal, hook height safety signal and all clamp unlocking signals are valid. By judging whether the hook position positioning signal, hook height positioning signal and clamp status signal on the tipping machine are all valid, the steel ladle will be pulled up by the bridge crane only if all are valid. If any one of them is invalid, the bridge crane will not perform the pulling up operation. Through the precise coordination and detection of the three, the single judgment of whether the steel ladle can be pulled up based only on whether the locking device of the tipping machine is unlocked is abandoned, the accuracy of judging whether the steel ladle can be pulled up is improved, and the problem of pulling up the steel ladle by mistake due to abnormal locking device or detection error is avoided, reducing the risk of safety accidents.

[0017] In addition, a method for preventing a bridge crane from pulling and tipping according to the present invention can at least achieve the above-mentioned technical effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of a system for preventing a bridge crane from pulling out and tipping a machine is provided in accordance with an embodiment of the present invention; Figure 2 A schematic diagram of a PLC controller provided in one embodiment of the present invention controlling a bridge crane to pull up a molten steel ladle; Figure 3 A schematic diagram of a PLC controller controlling a bridge crane to pull up a molten steel ladle is provided in accordance with another embodiment of the present invention.

[0020] The reference numerals are as follows: 1. Lifting lug of molten steel ladle; 2. Molten steel ladle; 3. Clamp; 4. Clamp status detector; 5. Tilt-turning machine; 6. Tilt-turning machine base; 7. Lifting hook; 8. Wireless transmitter; 9. Ground distribution box; 10. Ground distribution box base; 11. Plant column; 12. Bridge crane end beam; 13. Driver's cab distribution box; 14. Wireless receiver; 15. Baffle; 16. Position locator; 17. Horizontal main beam; 18. Lifting trolley; 19. Height locator; 20. Drum end cover; 21. Drum; 22. Bolts for fixing base of tilt-turning machine; 23. Controller. DETAILED DESCRIPTION

[0021] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0022] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0023] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0024] In addition, similar words such as "include" or "comprises" used in the present disclosure mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of covering other elements. It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0025] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0026] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0027] It should be understood that the embodiments of the present invention shown in the exemplary embodiments are only illustrative. Although only a few embodiments are described in detail in the present invention, it is easy for those skilled in the art to appreciate that multiple modifications are feasible without actually departing from the teaching of the subject matter of the present invention. Accordingly, all such modifications should be included within the scope of the present invention. Without departing from the gist of the present invention, other replacements, modifications, changes and deletions may be made to the design, operating conditions and parameters of the following exemplary embodiments.

[0028] According to a first aspect of the present invention, the present invention provides a system for preventing a bridge crane from pulling and tipping over. Figure 1 , Figure 1A schematic diagram of a system for preventing a bridge crane from pulling out a tilting machine provided by an embodiment of the present invention, wherein the bridge crane is installed on a plant column 11 through a bridge crane end beam 12, the bridge crane includes a longitudinal moving mechanism and a longitudinal running track for movement, and also includes a transverse main beam 17 and a lifting trolley 18 installed thereon, the lower end of the lifting trolley 18 is connected with a hook 7, the lifting trolley 18 can move transversely on the transverse main beam 17, the longitudinal moving mechanism of the bridge crane can move longitudinally on the longitudinal running track, the tilting machine 5 is installed on the ground, and the tilting machine base 6 of the tilting machine 5 is installed on the ground through the tilting machine fixing base bolts 22. When the operator completes the cleaning or maintenance of the molten steel ladle 2, the tilting machine 5 is started to restore the molten steel ladle 2 from a horizontal or inclined state to an original state (vertical state), the lifting trolley 18 of the bridge crane moves transversely to a position directly above the tilting machine 5, and then the lifting trolley 18 of the bridge crane controls the hook 7 to pull up the molten steel ladle lifting lug 1 to safely separate the molten steel ladle 2 from the tilting machine 5. In this process, it is necessary to accurately and in real time determine whether the molten steel ladle 2 can be pulled up. Only when the controller 23 of the bridge crane confirms that the molten steel ladle 2 can be pulled up, and then the hook 7 pulls up the molten steel ladle lug 1, will a safety accident not occur.Based on this, the anti-bridge crane pulling and tipping system includes a position locator 16 installed on the longitudinal side of the longitudinal moving mechanism and a baffle 15 installed on the inner side of the longitudinal running track. The lateral position of the baffle 15 is the same as the lateral position of the tipping machine 5. The position locator 16 is used to detect the baffle 15 and output a position positioning completion signal. It also includes a height locator 19 installed on the lifting trolley 18. The height locator 19 is used to output a hook height safety signal when it detects that the height of the hook 7 located vertically above the tipping machine 5 is not lower than the height of the steel ladle ear 1. It also includes a plurality of clamp state detectors 4 installed in the vicinity of the clamp 3 of the tipping machine 5. The clamp state detector 4 is used to output a clamp unlocking signal when it detects that the clamp 3 is released. When the tipping machine 5 is started to lock the steel ladle 2, the clamp 3 is in a locked state to ensure that the steel ladle 2 is stable. When the steel ladle 2 needs to be pulled up by the hook 7, the clamp 3 is in a released state to ensure The hook 7 can pull up the lifting ear 1 of the molten steel ladle without pulling out the molten steel ladle 2, and also includes a controller 23 which is communicatively connected to the position locator 16, the height locator 19 and multiple clamp state detectors 4 respectively. The controller 23 is located in the distribution box 13 in the driver's cab. The controller 23 is used to determine whether the received position positioning completion signal, the hook height safety signal and the all clamp unlocking signal are valid. If it is determined to be valid, the lifting trolley 18 is controlled to pull up the molten steel ladle 2. Through the communication between the controller 23 and the position locator 16, the height locator 19 and multiple clamp state detectors 4, instead of relying solely on the clamp state detector 4 to determine the locking or release state of the clamp 3 to confirm whether the molten steel ladle 2 can be pulled up, the accuracy of judging whether the molten steel ladle 2 can be currently pulled up by the hook 7 is improved, and the safety problem of pulling out the tipping machine 5 in the process of the bridge crane controlling the hook 7 to pull up the lifting ear 1 of the molten steel ladle through the lifting trolley 18 can be effectively avoided.

[0029] Further, the baffle 15 is installed on the inner side of the railing of the lifting platform of the longitudinal running track, and the position of the baffle 15 is a position that can be detected when the position locator 16 moves to the corresponding position. In other words, when the longitudinal moving mechanism moves to the corresponding position, the position locator 16 can detect the baffle 15. The position locator can be a photoelectric sensor, and the corresponding baffle is a shading plate. When the photoelectric sensor moves to the corresponding position and detects the shading plate, it means that the horizontal operation of the bridge crane is in place.

[0030] Furthermore, the controller 23 may be a PLC (Programmable Logic Controller) controller, such as Figure 2 and Figure 3The schematic diagram of the PLC controller provided in the two embodiments of the present invention respectively controlling the bridge crane to pull up the molten steel tank is that the PLC controller is also arranged in the power distribution box 13 in the driver's cab. The programmable feature of the PLC is that the operator can flexibly adjust the control logic through software programming without changing the hardware equipment.

[0031] Furthermore, each clamp 3 is equipped with a clamp state detector 4 for detecting whether it is locked or released. The number of clamp state detectors 4 is the same as the number of clamps 3 of the tilting machine 5. For example, Figure 1 In the embodiment, there are two clamps 3 on both sides of the tilting machine 5, and two clamp state detectors 4 are also provided near the clamps 3. The clamp state detectors 4 can be arranged below the clamps 3 at a preset distance therefrom, and the preset distance is obtained by the operator based on experience, and is generally 50-100 mm.

[0032] The above-mentioned system for preventing a bridge crane from pulling out a tilting machine determines whether the hook position positioning signal, the hook height positioning signal, and the clamp status signal on the tilting machine are all valid. Only when all three are valid will the bridge crane be used to pull up the molten steel ladle. If any one of them is invalid, the bridge crane will not perform the pulling up operation. Through the precise coordination and detection of the three, the single judgment of whether the molten steel ladle can be pulled up based solely on whether the locking device of the tilting machine is unlocked is abandoned, the accuracy of judging whether the molten steel ladle can be pulled up is improved, and the problem of mistakenly pulling up the molten steel ladle due to abnormal locking device or detection error is avoided, reducing the risk of safety accidents.

[0033] According to some embodiments of the present invention, the anti-bridge crane pulling and tipping machine system also includes a wireless receiving device 14 installed in a cab distribution box 13 at one end of the transverse main beam, and a wireless transmitting device 8 installed in a ground distribution box 9, the ground distribution box 9 is installed on the ground through a ground distribution box base 10, and the wireless transmitting device 8 is used to collect the position positioning completion signal, the hook height safety signal and the all clamp unlocking signal and convert them into wireless communication signals to send to the wireless receiving device 14. Through the communication between the wireless transmitting device 8 and the wireless receiving device 14, the positioning completion signal, the hook height safety signal and the all clamp unlocking signal generated by the anti-bridge crane pulling and tipping machine system can be collected in real time and transmitted to the controller 23 in real time, which can ensure that the controller 23 responds in time after receiving the above signal, thereby improving the efficiency of the system in real-time monitoring whether the steel ladle ear 1 of the steel ladle 2 can be pulled up by the hook 7.

[0034] Furthermore, the wireless transmitting device 8 and the wireless receiving device 14 are both powered by a power supply with an AC voltage of 220V.

[0035] According to some embodiments of the present invention, the controller 23 (such as a PLC controller) is connected to the wireless receiving device 14 for communication, and the wireless receiving device 14 receives the radio signal sent by the wireless transmitting device 8. The wireless receiving device 8 is used to connect all the received clamp unlocking signals in series and input them to the normally open signal end of the PLC controller 23. For example, there are a total of 4 clamp state detectors 4. After the wireless receiving device 8 receives the four-way clamp unlocking signal, the four-way point position changes from the open point to the closed point conduction state, and the received position positioning completion signal and the hook height safety signal are connected in parallel and then output. The signals are input into the normally closed signal terminal of the PLC controller 23, and finally all the clamp unlocking signals, position positioning completion signals and hook height safety signals connected in series are input into the PLC controller 23 in parallel, so as to judge whether each signal is valid through the PLC controller. If valid, the lifting trolley 18 is controlled to pull up the lifting eye 1 of the molten steel ladle, thereby improving the accuracy of judging whether the molten steel ladle 2 can be pulled up. Judging whether the molten steel ladle 2 can be pulled up from multiple dimensions greatly improves the accuracy compared with judging whether the molten steel ladle 2 can be pulled up only by whether the locking device of the tilting machine is unlocked.

[0036] According to some embodiments of the present invention, the height locator 19 can be a pull-rope displacement sensor, which measures the displacement by the extension and contraction of the pull rope to locate in real time whether the height of the hook 7 is lower than the height of the steel ladle lug 1. The height locator 19 is installed at the position of the center of the axis of the drum end cover 20 and the drum 21 on the lifting trolley 18, which can ensure that the height locator locates the current height of the hook 7 in real time as the drum 21 rotates. When the current height of the hook 7 is not lower than the height of the steel ladle lug 1, it means that the current height of the hook 7 will not cause safety problems, and the height locator 19 will output a hook safety signal. Otherwise, the current height of the hook 7 is lower than the height of the steel ladle lug 1, which means that the current height of the hook 7 will cause safety problems, and the hook safety signal will not be output.

[0037] According to the second aspect of the present invention, the present invention also provides a method for preventing a bridge crane from pulling and tipping, using any of the above-mentioned systems for preventing a bridge crane from pulling and tipping to perform the following steps: detecting a baffle plate by a position locator and outputting a position positioning completion signal when the baffle plate is detected, detecting whether the height of a hook located vertically above the tipping machine is lower than the height of a steel ladle lug by a height locator and outputting a hook height safety signal when detecting that the height is not lower than the steel ladle lug, detecting whether the corresponding clamps are released by multiple clamp state detectors and outputting a clamp unlocking signal when detecting that the corresponding clamps are released; The controller determines whether the received position positioning completion signal, hook height safety signal and all clamp unlocking signals are all valid, and controls the lifting trolley to pull up the molten steel ladle in response to that they are all valid.

[0038] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0039] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A system for preventing a bridge crane from pulling out and tipping over, characterized in that: The bridge crane includes a longitudinal moving mechanism and a longitudinal track for movement, a transverse main beam and a lifting trolley mounted thereon, and a hook is connected to the lower end of the lifting trolley. The system includes: A position locator installed on the longitudinal side of the longitudinal moving mechanism and a baffle installed on the inner side of the longitudinal running track and at the same lateral position as the tilting machine, the position locator is used to detect the baffle and output a position positioning completion signal; A height positioner installed on the lifting trolley is used to output a hook height safety signal when it is detected that the height of the hook located vertically above the tipping machine is not lower than the height of the steel ladle lifting lug; a plurality of clamp state detectors installed in the vicinity of the clamp of the tipping machine, for outputting a clamp unlocking signal upon detecting that the clamp is released; A controller that is communicatively connected to the position locator, height locator, and multiple clamp status detectors is used to control the lifting trolley to pull up the molten steel ladle when it is determined that the position positioning completion signal, hook height safety signal, and all clamp unlocking signals are valid.

2. The anti-overturning system for bridge crane pulling according to claim 1 is characterized in that: The system further comprises: A wireless receiving device is installed in a distribution box in the driver's cab at one end of the transverse main beam; The wireless transmitting device is installed in a ground distribution box close to the tipping machine and is used to convert the position positioning completion signal, the hook height safety signal and the all clamp unlocking signal into corresponding wireless signals and then send them to the wireless receiving device.

3. The anti-overturning system for bridge crane pulling according to claim 2 is characterized in that: The controller is a PLC controller, which is installed in the power distribution box in the driver's cab and is communicatively connected with the wireless receiving device.

4. The anti-overturning system for bridge crane pulling according to claim 3 is characterized in that: The wireless receiving device is used to connect all the received clamp unlocking signals in series and input them into the normally open signal terminal of the PLC controller, and to connect the received position positioning completion signal and hook height safety signal in parallel and input them into the normally closed signal terminal of the PLC controller.

5. The anti-overturning system for bridge crane pulling according to claim 2, characterized in that: The wireless transmitting device and the wireless receiving device are both powered by a power supply with an AC voltage of 220V.

6. The anti-overturning system for bridge crane pulling according to claim 1, characterized in that: The height locator is installed at the center of the drum end cover and the drum shaft on the lifting trolley, and rotates with the drum to locate the height of the hook in real time.

7. The anti-overturning system for bridge crane pulling according to claim 6, characterized in that: The baffle is installed on the inner side of the railing of the lifting platform of the longitudinal running track and is located in a position that can be detected by the position locator.

8. The anti-overturning system for bridge crane pulling according to claim 1, characterized in that: The number of the clamp state detectors is the same as the number of the clamps of the tilting machine, and a clamp state detector for detecting whether each clamp is in a released state is correspondingly installed near each clamp.

9. The anti-overturning system for bridge crane pulling according to claim 1, characterized in that: The position locator is a photoelectric sensor, and the baffle is a light shielding plate.

10. A method for preventing a bridge crane from pulling and tipping, characterized in that: The following steps are performed using the anti-overturning system for pulling out a bridge crane according to any one of claims 1 to 9: The baffle is detected by the position locator and a position positioning completion signal is output when the baffle is detected; the height of the hook located vertically above the tilting machine is detected by the height locator to be lower than the height of the steel ladle lug and a hook height safety signal is output when the height is detected to be not lower than the steel ladle lug; the plurality of clamp state detectors are used to detect whether the corresponding clamps are released and a clamp unlocking signal is output when the corresponding clamps are detected to be released; The controller determines whether the received position positioning completion signal, hook height safety signal and all clamp unlocking signals are all valid, and in response to being valid, controls the lifting trolley to pull up the molten steel ladle.

Images