Intelligent safety system for movable outrigger and crane

Abstract

The application discloses an intelligent safety system for movable supporting legs and a crane, which comprises a movable supporting leg device, a supporting leg automatic locking device, a pull wire sensor, a detection block, a controller and a display; the movable supporting leg device comprises a first movable supporting leg, a second movable supporting leg, a fixed leg and a vertical oil cylinder; the supporting leg automatic locking device controls the extension and retraction of a piston by means of a lock pin extending into an oil inlet and the lock pin retracting into the oil inlet; after the piston extends, the piston is inserted into a corresponding pin shaft hole to lock the supporting leg; the supporting leg automatic locking device detects whether the piston is in the extended position or the retracted position by means of a lock pin retraction detection switch and a lock pin extension detection switch and outputs corresponding signals. The application takes the supporting leg span requirement as a boundary condition, determines the extension and retraction logical sequence of the first and second supporting legs, the vertical oil cylinder, the supporting leg lock pin and other related components through the cooperation of various mechanisms, further controls the extension and retraction of each component through a driving device, and achieves the purpose of intelligently ensuring the safety of the movable supporting legs.

Description

Technical Field

[0001] The present invention relates to the field of cranes, and in particular to an intelligent safety system for movable outriggers and a crane. Background Art

[0002] Outrigger: A retractable support structure mounted on a crane. Lateral span: The distance between the center point of the vertical cylinder perpendicular to the vehicle's direction of travel between two adjacent outriggers in different extension states. Cylinder: A hydraulic actuator that converts hydraulic energy into mechanical energy, performing linear reciprocating motion. Outrigger lock pin: A component that inserts into the outrigger when the outrigger is in the extended or retracted state to prevent the outrigger from moving. Wire sensor: A component that determines the distance a moving part has moved by being fixed at one end and connected to the moving part at the other. Detection switch: A position switch that operates without direct mechanical contact with the moving part. A contactless proximity switch that turns the switch on or off when an object approaches the switch's sensing surface within the operating distance. Controller: Consists of a microprocessor, memory, input / output (I / O) interface, analog-to-digital converter (A / D), and large-scale integrated circuits such as shaping and drivers. A safe, intelligent controller that converts input signals into output signals through calculations.

[0003] The movable outriggers are the crane's retractable support devices, with different lateral spans typically corresponding to different operating conditions. As a movable component supporting the entire vehicle, high safety and reliability requirements are imposed when reaching the required lateral span for operations or vehicle travel. During crane hoisting operations, the safety requirements for the movable outriggers are that they extend to the specified span and force transmission point to prevent structural damage, and that they securely lock to prevent significant relative movement of the outriggers. When the crane is in motion, the safety requirement is that the outriggers securely lock to prevent them from falling off the vehicle.

[0004] Taking the commonly used double-section movable leg structure as an example, when supporting the vehicle, the second section of the movable leg can be extended and retracted in the horizontal direction inside the fixed leg, and the first section of the movable leg can be extended and retracted in the horizontal direction inside the first section of the movable leg. When extended and retracted to the specified span, the first section of the movable leg and the second section of the movable leg, as well as the second section of the movable leg and the fixed leg, respectively transmit force at their respective overlap blocks. At this time, the first and second section of the movable leg locking pins are inserted, and finally the vertical cylinder is extended. When the vehicle is driving, the first and second sections of the movable leg are all extended and retracted to the inside of the fixed leg, and the leg locking pins are inserted to lock them. The positions of the overlap blocks and the leg locking pin insertion holes are arranged according to the requirements of the horizontal span. The overlap blocks ensure that the structural parts are not damaged when transmitting force, and the leg locking pins prevent relative displacement between the legs. The two together ensure the safety of the operation.

[0005] When the crane is operating due to the negligence or improper operation of the operator, if it is not extended to the specified transverse span, the overlap block does not contact, or the insertion of the support leg lock pin is omitted, a major safety accident may occur, causing personnel injury and property damage. It is necessary to develop targeted safety protection technology.

[0006] The prior art such as application number 202010835497.4 "movable support leg locking device, control method thereof and engineering vehicle" introduces an engineering machinery locking device and control method. The pin assembly includes a pin assembly and a pin position detection mechanism. The pin can be inserted into the pin hole, thereby locking the movement of the movable support leg; the position detection mechanism is used to detect whether the pin is inserted into the pin hole on the movable support leg, and according to the detection result, the working state of the movable support leg driving mechanism and / or the engineering vehicle driving mechanism is controlled, thereby avoiding the omission of inserting the pin into the pin hole on the movable support leg when the engineering vehicle is driving on the road, which may cause the movable support leg to automatically shake out and cause accidents.

[0007] However, this technology can only detect whether the pin shaft is inserted into the pin shaft hole, and lacks position judgment of the correctness of the pin shaft hole. If the pin shaft is not inserted at the specified overlap position, it may also cause damage to the structure.

[0008] The prior art such as application number 202210611492.2 "support leg extension length detection method, device, equipment, medium and working machine" introduces a support leg extension length detection device and system. The scheme is provided with a distance measuring module on the support leg box of the working machine; a detection block is provided on the support leg, and the detection block is arranged at the detection position of the distance measuring module when the support leg is extended to a preset length. The support leg extension length detection method is to obtain the detection result of the distance measuring module, and based on the detection result, the extension length of the support leg is determined.

[0009] However, this technology can only detect the length of the extended support leg, and cannot determine the position of the first and second support legs, and does not further consider the safety protection of the support leg.

[0010] In summary, the existing technology mainly detects the length of the extended support leg or controls the state of the support leg lock pin. If only the length of the support leg is detected, when the support leg is partially extended, it cannot be determined whether each support leg has the desired length, and it cannot avoid the risk caused by the omission of the insertion of the support leg lock pin by the operator; if only the extension state of the support leg lock pin is controlled, when the support leg is not extended according to the specified sequence, the pin shaft is not inserted into the specified pin shaft hole, causing the support leg to not transmit force at the overlap position, which also has a great risk.

[0011] Therefore, it is necessary to develop a new type of technology to solve the problem of lack of comprehensive safety protection of the movable support leg during crane operation or driving. SUMMARY

[0012] The application aims at the deficiencies and defects of the prior art, and provides an active support leg intelligent safety system and a crane, so as to determine the extension and retraction logic sequence of first and second support legs, a vertical oil cylinder, a support leg locking pin and other related components through the cooperation of various mechanisms, and further control the extension and retraction of each component through a driving device, so as to achieve the purpose of intelligently ensuring the safety of the active support leg.

[0013] Technical scheme: The active support leg intelligent safety system comprises an active support leg device, a support leg automatic locking device, a pull wire sensor, a detection block, a controller and a display.

[0014] The active support leg device comprises a section active support leg, a two-section active support leg, a fixed leg and a vertical oil cylinder. The support leg automatic locking device is arranged on the active support leg device, controls the extension and retraction of a piston through the extension of a locking pin into an oil inlet and the retraction of the locking pin into the oil inlet, and inserts the piston into a corresponding pin shaft hole to lock the support leg after the piston is extended. The support leg automatic locking device detects whether the piston is in the extended or retracted position through a locking pin retraction detection switch and a locking pin extension detection switch and outputs a corresponding signal.

[0015] The one end of the pull wire sensor is fixed to the fixed leg, and the other end is fixed to the tail of the section active support leg. When the section active support leg or the two-section active support leg is extended or retracted, the pull wire sensor obtains the movement distance of the active support leg and transmits a corresponding signal. The inside of the box body of the section active support leg is provided with a section active support leg automatic locking device. The fixed leg overlap block of the fixed leg is provided with a two-section active support leg automatic locking device. The inside of the two-section active support leg is provided with corresponding full extension pin hole detection blocks and extension pin hole detection blocks. The outside of the two-section active support leg is provided with a two-section support leg detection block. When the active support leg moves to a specified span, the pin hole position detection switch detects the corresponding detection block and sends a corresponding signal to control the extension and retraction of the piston.

[0016] The active support leg device, the support leg automatic locking device, the pull wire sensor and the detection block are connected with the controller and the display.

[0017] The active support leg device is provided with a plurality of overlap blocks and support leg locking pins. The plurality of overlap blocks comprise a first overlap block, a second overlap block, a third overlap block, a fourth overlap block and a fixed leg overlap block. The plurality of support leg locking pins comprise a first support leg locking pin and a second support leg locking pin.

[0018] The support leg automatic locking device comprises a piston, a locking pin retraction detection switch, a locking pin extension detection switch, a pin hole position detection switch, a locking pin extension oil inlet and a locking pin retraction oil inlet. The detection block comprises full extension pin hole detection blocks, extension pin hole detection blocks and a two-section support leg detection block.

[0019] Wherein, the wire pulling sensor is an infrared length sensor.

[0020] When the movable leg is extended: the leg panel issues an extension command for the movable leg, the controller receives the instruction sent by the leg panel, and controls the piston of the automatic locking device of the leg to be pulled out from the pin shaft hole; after the piston retracts to the specified position, the lock pin retraction detection switch detects the piston retraction and sends a signal to the controller; the controller sends instructions according to the required working span, and controls the one section of the movable leg and the second section of the movable leg to extend through the actuator; when the pull wire sensor detects that the leg has reached the predetermined length, and the pin hole position detection switches of the first and second sections detect the corresponding detection blocks, the three send signals to the controller; if the three cannot send signals to the controller at the same time, it is determined that the leg extension sequence is wrong, and the extension lengths of the one section of the movable leg and the second section of the movable leg need to be adjusted until the conditions are met; after receiving the signal, the controller controls the piston of the automatic locking device of the leg to be inserted into the pin shaft hole; after the piston is inserted to the specified depth, the lock pin extension detection switch detects the piston extension, and sends a signal to the controller, and the controller sends a vertical cylinder extension instruction to support the vehicle.

[0021] When the movable leg is retracted: the leg panel issues a retraction command for the movable leg, the controller receives the instruction sent by the leg panel, and controls the piston of the automatic locking device of the leg to be pulled out from the pin shaft hole; after the piston retracts to the specified position, the lock pin retraction detection switch detects the retraction of the piston and sends a signal to the controller; the controller sends a retraction command for the vertical cylinder, the vertical cylinder is retracted into place, and then controls the retraction of the first and second movable legs through the actuator; during the retraction process, the pull-wire sensor sends the detected leg length signal to the controller, and when it retracts to the specified span, the corresponding pin hole position detection switch detects the corresponding detection block and sends the detection signal to the controller; after receiving the signal, the controller controls the piston of the automatic locking device of the leg to be inserted into the pin shaft hole; after the piston is inserted to the specified depth, the lock pin extension detection switch detects the extension of the piston, and sends a signal to the controller, and the retraction of the movable leg is completed;

[0022] When the vehicle is driving: the lock pin retraction detection switch sends the detected signal to the controller. When the signal is missing, the display alarm prompts to remind the driver to stop and check whether the movable leg has been safely locked.

[0023] A crane using the movable leg intelligent safety system of the present invention.

[0024] Beneficial effects: Compared with the existing technology, the present invention has the following significant advantages: the present invention combines the structural form, working principle and mechanical locking mechanism of the existing movable legs, and intelligently coordinates the relationship between the extension and retraction of the legs, the extension and retraction of the vertical cylinder and the locking of the legs by determining the lateral span of the legs, so as to achieve the purpose of providing reliable safety protection for the crane during operation and driving.

[0025] The present invention uses signals from a pull-wire sensor and a pinhole position detection switch to accurately determine whether the first and second movable legs have been extended or retracted to the specified position as required. When the movable legs are not in the overlapped position, the vertical cylinder cannot be extended normally, eliminating the risk of vehicle tipping due to misoperation. The present invention uses an automatic leg locking device to control the locking of the legs, eliminating the risk of missing leg locking pins during vehicle operation. The locking status of the legs can also be monitored while the vehicle is in motion to prevent the legs from slipping off the vehicle and causing risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the existing double-section movable outrigger structure;

[0027] Figure 2 This is the structural diagram of the prior art patent 202010835497.4;

[0028] Figure 3 This is the structural diagram of the prior art patent 202210611492.2;

[0029] Figure 4 It is a structural schematic diagram of the movable supporting leg of the present invention;

[0030] Figure 5 It is a structural schematic diagram of the automatic locking device for supporting legs of the present invention;

[0031] Figure 6 This is a schematic diagram of the arrangement structure of the automatic locking device of the outrigger and the pull-wire sensor of the present invention;

[0032] In the figure, 1 is a movable leg; 2 is a two-section movable leg; 3 is a fixed leg; 4 is a vertical oil cylinder; 5 is a first overlap block; 6 is a second overlap block; 7 is a third overlap block; 8 is a first leg locking pin; 9 is a fourth overlap block; 10 is a fixed leg overlap block; 11 is a second leg locking pin; 12 is an automatic locking device for the two-section movable leg; 13 is a pull wire sensor; 14 is a piston; 15 is a lock pin retraction detection switch; 16 is a lock pin extension detection switch; 17 is a pin hole position detection switch; 18 is a lock pin extension oil inlet; 19 is a lock pin retraction oil inlet; 20 is an automatic locking device for a movable leg; 21 is a fully extended pin hole detection block; 22 is an extended pin hole detection block; 23 is a two-section leg detection block. DETAILED DESCRIPTION

[0033] The technical solutions of the present application are further described below in combination with the drawings and specific embodiments.

[0034] The movable outrigger intelligent safety system of the present application comprises a movable outrigger device, an outrigger automatic locking device, a pull wire sensor 13, a detection block, a controller and a display. The movable outrigger device comprises a one-section movable outrigger 1, a two-section movable outrigger 2, a fixed leg 3 and a vertical oil cylinder 4. The outrigger automatic locking device is arranged on the movable outrigger device. The outrigger automatic locking device controls the extension and retraction of the piston 14 by means of the lock pin extension inlet 18 and the lock pin retraction inlet 19. After the piston 14 is extended, it is inserted into the corresponding pin shaft hole to lock the outrigger. The outrigger automatic locking device detects whether the piston 14 is in the extended or retracted position by means of the lock pin retraction detection switch 15 and the lock pin extension detection switch 16 and outputs the corresponding signal.

[0035] One end of the pull wire sensor 13 is fixed on the fixed leg 3, and the other end is fixed on the tail of the one-section movable outrigger 1. When the one-section movable outrigger 1 or the two-section movable outrigger 2 is in extension and retraction movement, the pull wire sensor 13 obtains the movement distance of the movable outrigger and transmits the corresponding signal. The inside of the box body of the one-section movable outrigger 1 is provided with a one-section movable outrigger automatic locking device 20. The fixed leg lap joint block 10 of the fixed leg 3 is provided with a two-section movable outrigger automatic locking device 12. The inside of the two-section movable outrigger 2 is arranged with corresponding full extension pin hole detection block 21 and extension pin hole detection block 22. The outside of the two-section movable outrigger 2 is arranged with a two-section outrigger detection block 23. When the movable outrigger moves to the specified span, the pin hole position detection switch 17 detects the corresponding detection block and sends out the corresponding signal to control the extension and retraction of the piston 14.

[0036] The movable outrigger device, the outrigger automatic locking device, the pull wire sensor 13 and the detection block of the present application are respectively connected with the controller and the display. The movable outrigger device is provided with a plurality of lap joint blocks and outrigger lock pins. The plurality of lap joint blocks comprise a first lap joint block 5, a second lap joint block 6, a third lap joint block 7, a fourth lap joint block 9 and a fixed leg lap joint block 10. The plurality of outrigger lock pins comprise a first outrigger lock pin 8 and a second outrigger lock pin 11. The outrigger automatic locking device comprises a piston 14, a lock pin retraction detection switch 15, a lock pin extension detection switch 16, a pin hole position detection switch 17, a lock pin extension inlet 18 and a lock pin retraction inlet 19. The detection block comprises a full extension pin hole detection block 21, an extension pin hole detection block 22 and a two-section outrigger detection block 23. The pull wire sensor 13 is an infrared length sensor.

[0037] When the active leg extension operation is performed: the leg panel sends the extension command of the active leg, the controller receives the instruction sent by the leg panel, controls the piston 14 of the active leg automatic locking device to pull out of the pin hole; after the piston 14 is retracted to the specified position, the lock pin retraction detection switch 15 detects that the piston 14 is retracted and sends a signal to the controller; the controller sends an instruction according to the required operation span, controls the first active leg 1 and the second active leg 2 to extend through the execution element; when the pull wire sensor 13 detects that the leg has reached the predetermined length, and the pin hole position detection switch 17 of the first and second active legs detects the corresponding detection block, the three send signals to the controller; if the three cannot send signals to the controller at the same time, it is determined that the leg extension sequence is wrong, and the respective extension lengths of the first active leg 1 and the second active leg 2 need to be adjusted to meet the conditions; after the controller receives the signal, the piston 14 of the active leg automatic locking device is inserted into the pin hole; after the piston 14 is inserted to the specified depth, the lock pin extension detection switch 16 detects that the piston 14 is extended and sends a signal to the controller, and the controller sends an extension instruction of the vertical cylinder 4 to perform the vehicle supporting operation.

[0038] When the active leg retraction operation is performed: the leg panel sends the retraction command of the active leg, the controller receives the instruction sent by the leg panel, controls the piston 14 of the active leg automatic locking device to pull out of the pin hole; after the piston 14 is retracted to the specified position, the lock pin retraction detection switch 15 detects that the piston 14 is retracted and sends a signal to the controller; the controller sends a retraction instruction of the vertical cylinder 4, the vertical cylinder 4 is retracted to the position, and then controls the first active leg 1 and the second active leg 2 to retract through the execution element; the pull wire sensor 13 sends the leg length signal detected in the retraction process to the controller, and when the specified span is retracted, the corresponding pin hole position detection switch 17 detects the corresponding detection block and sends a detection signal to the controller; after the controller receives the signal, the piston 14 of the active leg automatic locking device is inserted into the pin hole; after the piston 14 is inserted to the specified depth, the lock pin extension detection switch 16 detects that the piston 14 is extended and sends a signal to the controller, and the active leg retraction is completed;

[0039] When the vehicle is running: the lock pin retraction detection switch 15 sends the detected signal to the controller, and when the signal is missing, the display alarm is prompted to remind the driver to stop and check whether the active leg is safely locked.

[0040] The present application combines the structure form, working principle and mechanical locking mechanism of the existing active leg, intelligently coordinates the relationship among the extension and retraction of the active leg, the extension and retraction of the vertical cylinder and the locking of the active leg by judging the lateral span of the active leg, and achieves the purpose of providing reliable and safe protection for the crane in the operation and running processes.

[0041] The application accurately determines whether the first and second movable supporting legs are stretched to the specified position according to the requirements through the signal cooperation of the pull wire sensor and the pin hole position detection switch, and the vertical oil cylinder cannot normally extend at the non-lapping block position of the movable supporting leg, thereby eliminating the risk of vehicle overturning caused by misoperation. The application controls the locking of the supporting leg through the supporting leg automatic locking device, thereby eliminating the risk caused by the omission of inserting the supporting leg locking pin during the operation of the vehicle; and the locking state of the supporting leg can be monitored during the driving of the vehicle, thereby preventing the risk caused by the sliding of the supporting leg from the vehicle.

[0042] The application accurately determines the extension length of each movable supporting leg through the combination of the supporting leg extension length detection and the supporting leg position detection, and the vertical oil cylinder is not allowed to extend the vehicle at the non-lapping transmission point. The supporting leg automatic locking device plays a role in the system, which is to control the automatic locking of the movable supporting leg and to determine the extension position of the supporting leg through the pin hole position detection. The extension length of each supporting leg is determined through the combination of the supporting leg extension length detection and the supporting leg position detection, and then the locking and unlocking of the supporting leg are intelligently controlled according to the required working condition through the controller, thereby eliminating the risk caused by human misoperation or omission.

[0043] The pull wire sensor of the application can be an infrared length sensor or other sensors capable of measuring the moving distance. The supporting leg automatic locking device of the two movable supporting legs can be on the fixed leg lapping block or in the box-shaped interior of the two movable supporting legs. The detection of the piston position in the supporting leg automatic locking device is not limited to the proximity switch, but can also be other detection methods such as the travel switch. The description of the intelligent safety system is only an example of the two supporting legs, and the single or multiple supporting legs are also applicable.

Claims

1. An intelligent safety system for movable legs, characterized by: The invention comprises a movable leg device, an automatic leg locking device, a wire sensor (13), a detection block, a controller and a display; the movable leg device comprises a movable leg (1), two movable legs (2), a fixed leg (3) and a vertical oil cylinder (4); the automatic leg locking device is arranged on the movable leg device, and the automatic leg locking device controls the extension and contraction of the piston (14) by extending the locking pin from the oil inlet (18) and retracting the locking pin from the oil inlet (19); after the piston (14) is extended, it is inserted into the corresponding pin shaft hole to lock the leg; the automatic leg locking device is arranged on the movable leg device, and the automatic leg locking device controls the extension and contraction of the piston (14) by extending the locking pin from the oil inlet (18) and retracting the locking pin from the oil inlet (19); after the piston (14) is extended, it is inserted into the corresponding pin shaft hole to lock the leg; The locking device detects whether the piston (14) is in the extended or retracted position through a lock pin retraction detection switch (15) and a lock pin extension detection switch (16) and outputs a corresponding signal; the support leg automatic locking device comprises a piston (14), a lock pin retraction detection switch (15), a lock pin extension detection switch (16), a pin hole position detection switch (17), a lock pin extension oil inlet (18) and a lock pin retraction oil inlet (19); the detection block comprises a fully extended pin hole detection block (21), an extended pin hole detection block (22) and a two-section support leg detection block (23); When the movable leg is extended: the leg panel issues an extension command for the movable leg, the controller receives the command sent by the leg panel, and controls the piston (14) of the leg automatic locking device to be pulled out from the pin shaft hole; after the piston (14) retracts to the specified position, the lock pin retraction detection switch (15) detects the retraction of the piston (14) and sends a signal to the controller; the controller sends a command according to the required working span, and controls the first and second movable legs (1) and (2) to be extended through the actuator; when the wire sensor (13) detects that the leg has reached the predetermined length, the pin holes of the first and second sections are closed. When the position detection switch (17) detects the corresponding detection block, the three send a signal to the controller; if the three cannot send a signal to the controller at the same time, it is determined that the order of extending the legs is wrong, and the extension lengths of the first movable leg (1) and the second movable leg (2) need to be adjusted respectively until the conditions are met; after receiving the signal, the controller controls the piston (14) of the automatic locking device of the legs to be inserted into the pin shaft hole; after the piston (14) is inserted to the specified depth, the lock pin extension detection switch (16) detects that the piston (14) is extended, and sends a signal to the controller, and the controller sends an extension instruction of the vertical oil cylinder (4) to support the vehicle; When the movable leg is retracted: the leg panel issues a retraction command for the movable leg, the controller receives the command sent by the leg panel, and controls the piston (14) of the leg automatic locking device to be pulled out from the pin shaft hole; after the piston (14) retracts to the specified position, the lock pin retraction detection switch (15) detects the retraction of the piston (14) and sends a signal to the controller; the controller sends a retraction command for the vertical oil cylinder (4), and the vertical oil cylinder (4) is retracted into place, and then controls the first section of the movable leg (1), the second section of the movable leg (2) and the second section of the movable leg (3) through the actuator. ) to retract; during the retraction process, the wire sensor (13) sends the detected leg length signal to the controller, and when it retracts to the specified span, the corresponding pin hole position detection switch (17) detects the corresponding detection block and sends the detection signal to the controller; after receiving the signal, the controller controls the piston (14) of the leg automatic locking device to insert into the pin shaft hole; after the piston (14) is inserted to the specified depth, the lock pin extension detection switch (16) detects that the piston (14) is extended, and sends a signal to the controller, and the retraction of the movable leg is completed; When the vehicle is in motion, the lock pin retraction detection switch (15) sends a detected signal to the controller. When the signal is lost, an alarm is displayed to remind the driver to stop the vehicle and check whether the movable legs have been safely locked.

2. The intelligent safety system for movable legs according to claim 1, characterized in that: One end of the pull-wire sensor (13) is fixed on the fixed leg (3), and the other end is fixed on the tail of a movable leg (1). When the movable leg (1) or the second movable leg (2) performs telescopic movement, the pull-wire sensor (13) obtains the movement distance of the movable leg and transmits a corresponding signal; a movable leg automatic locking device (20) is provided on the inner side of the box body of the first movable leg (1), and a second movable leg automatic locking device (12) is provided on the fixed leg overlap block (10) of the fixed leg (3); a corresponding full-extension pin hole detection block (21) and an extension pin hole detection block (22) are arranged on the inner side of the second movable leg (2), and a second leg detection block (23) is arranged on the outer side of the second movable leg (2); when the movable leg moves to a specified span, the pin hole position detection switch (17) detects the corresponding detection block and sends a corresponding signal to control the extension and contraction of the piston (14).

3. The intelligent safety system for movable legs according to claim 1, characterized in that: The movable leg device, the leg automatic locking device, the wire sensor (13), and the detection block are connected to the controller and the display respectively.

4. The intelligent safety system for movable legs according to claim 1, characterized in that: The movable leg device is provided with a plurality of overlapping blocks and leg locking pins.

5. The intelligent safety system for movable legs according to claim 4, characterized in that: Several of the overlapping blocks include a first overlapping block (5), a second overlapping block (6), a third overlapping block (7), a fourth overlapping block (9) and a fixed leg overlapping block (10); and several of the leg locking pins include a first leg locking pin (8) and a second leg locking pin (11).

6. The intelligent safety system for movable legs according to claim 1, characterized in that: The wire pulling sensor (13) is an infrared length sensor.

7. A crane using the movable leg intelligent safety system according to any one of claims 1 to 6.

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