Safe cantilever crane

Abstract

The utility model discloses a safety type cantilever crane which comprises a supporting column, a suspension frame installed on the locking supporting column, a main beam installed on the suspension frame, a hoisting system arranged on the main beam, and a reinforcing mechanism connected between the main beam and the suspension frame and comprising a first fixing plate, a second fixing plate, a hinge frame and a safety cable, the two ends of the safety cable are both provided with quick-mounting mechanisms connected to the two sets of hinged frames, each quick-mounting mechanism comprises a connecting block, an inserting rod, a fixing sleeve, a clamping block, a clamping groove, a connecting rod and a locking mechanism, the connecting blocks are installed at the two ends of the safety cable, the inserting rods are installed at the top ends of the two sets of connecting blocks, and a user can quickly mount and dismount the safety cable; through cooperation of a sliding groove, a sliding sleeve, a rotating sleeve and a spiral groove, a clamping block can be rapidly released when needed, fixing of an inserting rod by a clamping groove is relieved, therefore, replacement of a safety cable is facilitated, coordinated movement of all components is ensured through cooperation of a connecting rod and a tension spring, and the rapid installation process is stable and efficient.

Description

Technical Field

[0001] This utility model relates to the field of cantilever crane technology, and more specifically, to a safety-type cantilever crane. Background Technology

[0002] In modern industry and construction engineering, cantilever cranes are widely used for lifting heavy objects and handling goods. However, as the service time increases, various components of the crane will be affected by wear and aging. In particular, the safety rope, as a key part to protect the stability and operational safety of the crane, may experience wear and breakage after long-term use. The traditional safety rope replacement process is cumbersome and time-consuming, requiring the disassembly of a large number of parts to complete the replacement work. This causes great inconvenience to the efficient operation and maintenance cycle of the crane. Because the replacement process cannot be done quickly and conveniently, it greatly affects the maintenance efficiency of the equipment and the user's working time.

[0003] Furthermore, in some high-frequency operating conditions, the working environment of cranes is relatively complex, and safety cables may be frequently subjected to stress and external forces. Therefore, timely replacement of safety cables to ensure the safe operation of cranes is particularly important. In the existing technology, the replacement of safety cables requires manual operation. The disassembly and reinstallation process not only takes a long time, but also poses potential safety hazards. Due to the limitations of the installation location and structure, maintenance personnel often find it difficult to ensure the stability and correct installation of safety cables during the replacement process. In fact, improper operation may lead to insecure installation, affecting the safety of subsequent lifting operations. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the problems existing in the prior art, this utility model provides a safety cantilever crane to solve the technical problem mentioned in the background art that the traditional safety rope replacement process is cumbersome and time-consuming, requiring the disassembly of a large number of parts to complete the replacement operation.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a safety cantilever crane, including a support column, a suspension mounted on the support column, a main beam mounted on the suspension, a lifting system mounted on the main beam, and a reinforcing mechanism connecting the main beam and the suspension. The reinforcing mechanism includes a first fixed plate, a second fixed plate, a hinge frame, and a safety cable. The first fixed plate is mounted on the top surface of the main beam, the second fixed plate is mounted on the side wall of the suspension, and the hinge frame has two sets that rotatably connect the first fixed plate and the second fixed plate. Both ends of the safety cable are provided with quick-release mechanisms connected to the two sets of hinge frames. The quick-release mechanism includes a connecting block, a plug rod, a fixing sleeve, a locking block, a locking groove, a connecting rod, and a locking mechanism. The connecting block is mounted on both ends of the safety cable, the plug rod is mounted on the top of the two sets of connecting blocks, the fixing sleeve is mounted on the top surface of the two sets of hinge frames, multiple sets of locking blocks are provided that slide on the inner walls of the two sets of fixing sleeves, the locking groove is provided on the outer walls of the two sets of plug rods, and multiple sets of connecting rods are provided that are mounted on the top of the multiple sets of locking blocks.

[0008] This invention further comprises a locking mechanism including a sliding groove, a sliding sleeve, a rotating sleeve, a spiral groove, a guide block, and a locking sleeve. The sliding groove is disposed on the outer wall of the fixed sleeve, and the sliding sleeve slides within the sliding groove. The rotating sleeve is rotatably mounted on the outer wall of the fixed sleeve. The spiral groove is disposed on the outer wall of the sliding sleeve. Multiple guide blocks are disposed on the inner wall of the rotating sleeve and slidably connected to the spiral groove. The locking sleeve is mounted on the bottom end of the sliding sleeve and abuts against the bottom ends of multiple sets of connecting rods. With this configuration, the locking mechanism can form a stable interaction between the sliding sleeve and the rotating sleeve, making the locking or unlocking process more flexible and smooth, effectively avoiding jamming or unevenness between components, and improving the convenience and safety of operation.

[0009] This invention is further configured such that the bottom ends of multiple sets of connecting rods are all provided with inclined surfaces that abut against the inner wall of the locking sleeve. This design provides a more uniform force transmission, avoids localized wear or damage caused by force concentration, effectively extends the service life of the locking mechanism, and ensures a more balanced force transmission during operation, thereby improving the stability of the overall structure.

[0010] The present invention is further configured such that the inner side of the spiral groove and the guide block are both arc-shaped. The arc shape of the spiral groove and the guide block can ensure that the sliding sleeve slides more smoothly, reduce friction and wear between components, avoid jamming caused by sharp angles or irregular shapes, and make the locking mechanism work more smoothly and steadily.

[0011] This invention is further configured such that tension springs are connected between the inner sides of the multiple sets of connecting rods and the outer wall of the fixed sleeve. The function of the tension springs is to provide elastic restoring force. When the sliding sleeve is displaced, the tension springs can automatically restore the position of each component, ensuring a tight fit between the components. At the same time, they can also buffer external forces during operation, avoiding structural deformation or damage caused by improper operation or excessive external forces.

[0012] This invention is further configured such that each of the multiple sets of connecting rods has an abutment block installed at its top, the sliding sleeve has an inclined surface, and the inner side of each of the multiple sets of abutment blocks is spherical. The inclined surface cooperation between the abutment block and the sliding sleeve ensures that the abutment block can smoothly contact the sliding sleeve during installation or disassembly, reducing friction during operation. The spherical design makes the contact between the components more stable and uniform, further improving the efficiency and safety of operation.

[0013] This invention is further configured such that the outer wall of the fixed sleeve is provided with a positioning mechanism. The positioning mechanism includes a mounting ring, positioning blocks, a return spring, a positioning groove, a pressure sleeve, and a push spring. The mounting ring is mounted on the outer wall of the fixed sleeve. Multiple sets of positioning blocks are slidably mounted on the mounting ring. Multiple sets of return springs are respectively mounted inside the multiple sets of positioning blocks and connected to the outer wall of the mounting ring. Multiple sets of positioning grooves are respectively provided on the outer wall of the rotating sleeve. The pressure sleeve slides on the outer wall of the fixed sleeve. Multiple sets of push springs are provided, with both ends connected to the pressure sleeve and the fixed sleeve, respectively. Through the cooperation of the return spring and the push spring, the positioning mechanism ensures accurate positioning of the rotating sleeve within the fixed sleeve, preventing loosening or displacement due to vibration or external force, improving the stability and reliability of the equipment, and ensuring operational accuracy and safety.

[0014] This invention is further characterized in that the outer walls of the multiple sets of positioning blocks and the bottom ends of the pressure sleeve are all provided with rounded corners. The rounded corner design effectively reduces the friction between the positioning blocks and the pressure sleeve, avoids wear or jamming problems that may be caused by sharp corners, ensures smooth operation and long-term stable operation of the positioning mechanism, reduces maintenance costs and improves the durability of the overall structure.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, this utility model provides a safe cantilever crane, which has the following features:

[0017] Beneficial effects:

[0018] 1. The reinforced mechanism, through the connection of the first and second fixed plates, provides a more stable support between the main beam and the suspension, ensuring the safety of the lifting system. The articulated frame design effectively connects the main beam and the suspension, enhancing the stability of the overall structure and preventing displacement or deformation caused by vibration or external forces during operation. The safety rope is connected to the articulated frame at both ends through a quick-release mechanism, ensuring a tight and stable connection, thereby improving the overall anti-overturning ability and safety performance of the machine. The reinforced mechanism design allows the crane to withstand greater working loads during actual use, while preventing loosening or instability between the main beam and the suspension, providing reliable protection for subsequent work.

[0019] 2. The quick-installation mechanism greatly simplifies the safety cable replacement process. Through the cooperation of structures such as the insertion rod, locking block, and locking slot, users can quickly install and remove the safety cable. In particular, the locking mechanism, through the cooperation of the sliding groove, sliding sleeve, rotating sleeve, and spiral groove, can quickly release the locking block when needed, allowing the locking slot to release the fixing of the insertion rod, thus facilitating the replacement of the safety cable. The cooperation of the connecting rod and tension spring ensures the coordinated movement of each component, making the quick-installation process both smooth and efficient. The quick-installation mechanism not only improves replacement efficiency but also reduces the labor intensity of maintenance personnel, reduces potential risks and misoperations during maintenance, and provides technical support for the efficient operation of the crane.

[0020] 3. The positioning mechanism precisely locks the position of the rotating sleeve through the cooperation between the fixed sleeve and the rotating sleeve, thereby restricting the movement of the locking mechanism and ensuring the stability of the safety rope in the working state. When unlocking is required, the interaction between the pressure sleeve and the positioning block is pushed by the push spring, causing the positioning block to disengage from the positioning groove, thereby releasing the lock on the rotating sleeve. This design makes the positioning process simpler and more efficient, avoiding cumbersome adjustments and excessive operation of components when replacing the safety rope. The positioning mechanism, through precise spring action and positioning groove design, ensures that each component can be accurately positioned during the replacement process, ensuring safety and operational reliability, and further improving the efficiency and safety factor of the equipment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a safety-type cantilever crane according to the present invention;

[0022] Figure 2 This is a schematic diagram of the hinge frame in this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the fixing sleeve in this utility model;

[0024] Figure 4 This is a cross-sectional view of the quick-assembly mechanism in this utility model;

[0025] Figure 5 This is a cross-sectional view of the positioning mechanism in this utility model.

[0026] In the diagram: 1. Support column; 2. Suspension; 3. Main beam; 4. Lifting system; 5. First fixed plate; 6. Second fixed plate; 7. Articulated frame; 8. Safety rope; 9. Connecting block; 10. Insert rod; 11. Fixed sleeve; 12. Locking block; 13. Locking groove; 14. Connecting rod; 15. Sliding groove; 16. Sliding sleeve; 17. Rotating sleeve; 18. Spiral groove; 19. Guide block; 20. Locking sleeve; 21. Tension spring; 22. Abutment block; 23. Inclined surface; 24. Mounting ring; 25. Positioning block; 26. Return spring; 27. Positioning groove; 28. Pressure sleeve; 29. ​​Push spring. Detailed Implementation

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0028] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0029] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0030] Please see Figures 1-5 A safety-type cantilever crane includes a support column 1, a suspension 2 mounted on the support column 1, a main beam 3 mounted on the suspension 2, a lifting system 4 mounted on the main beam 3, and a reinforcing mechanism connecting the main beam 3 and the suspension 2. The reinforcing mechanism includes a first fixed plate 5, a second fixed plate 6, a hinge frame 7, and a safety cable 8. The first fixed plate 5 is mounted on the top surface of the main beam 3, the second fixed plate 6 is mounted on the side wall of the suspension 2, the hinge frame 7 has two sets of components rotatably connecting the first fixed plate 5 and the second fixed plate 6 respectively, and the safety cable 8... Both ends are equipped with quick-connect mechanisms connected to the two sets of hinge frames 7. The quick-connect mechanism includes a connecting block 9, a plug rod 10, a fixing sleeve 11, a locking block 12, a slot 13, a connecting rod 14, and a locking mechanism. The connecting block 9 is installed at both ends of the safety rope 8, the plug rod 10 is installed at the top of the two sets of connecting blocks 9, the fixing sleeve 11 is installed on the top surface of the two sets of hinge frames 7, the locking block 12 is provided with multiple sets that slide on the inner wall of the two sets of fixing sleeves 11, the slot 13 is provided on the outer wall of the two sets of plug rods 10, and the connecting rod 14 is provided with multiple sets that are installed on the top of the multiple sets of locking blocks 12.

[0031] The locking mechanism includes a slide groove 15, a slide sleeve 16, a rotating sleeve 17, a spiral groove 18, a guide block 19, and a locking sleeve 20. The slide groove 15 is provided on the outer wall of the fixed sleeve 11, the slide sleeve 16 slides in the slide groove 15, the rotating sleeve 17 is rotatably mounted on the outer wall of the fixed sleeve 11, the spiral groove 18 is provided on the outer wall of the slide sleeve 16, the guide block 19 is provided with multiple sets mounted on the inner wall of the rotating sleeve 17 and slidably connected to the spiral groove 18, and the locking sleeve 20 is mounted on the bottom end of the slide sleeve 16 and abuts against the bottom ends of multiple sets of connecting rods 14.

[0032] The bottom ends of multiple connecting rods 14 are all provided with inclined surfaces 23 and abut against the inner wall of the locking sleeve 20. The principle of this design is that the cooperation of the inclined surfaces allows for more uniform contact and smoother force transmission between the bottom ends of the connecting rods 14 and the inner wall of the locking sleeve 20, avoiding excessive friction or wear caused by excessive local pressure. This makes the locking or unlocking process smoother and the force transmission more uniform, improving the stability and durability of the entire locking mechanism.

[0033] Both the inner side of the spiral groove 18 and the guide block 19 are designed in an arc shape. The arc shape reduces frictional resistance, allowing the guide block 19 to move smoothly within the spiral groove 18 during sliding, reducing the risk of wear and jamming, improving the stability and efficiency of the entire locking mechanism, and extending the service life of the components.

[0034] Tension springs 21 are connected between the inner side of multiple connecting rods 14 and the outer wall of the fixed sleeve 11. The tension springs 21 provide elastic restoring force, which enables the components to automatically return to their original positions when displacement occurs, ensuring tight cooperation between the components during operation and effectively reducing the impact force during operation. This avoids structural deformation or damage caused by improper operation or excessive external force, thereby improving the stability and safety of the system.

[0035] Each of the multiple connecting rods 14 has an abutment block 22 mounted at its top, and the sliding sleeve 16 has an inclined surface 23. The inner sides of the multiple abutment blocks 22 are all spherical. The combination of the abutment block 22 and the inclined surface 23 of the sliding sleeve 16 allows the connecting rods 14 to make more stable contact during installation or disassembly, reducing friction and improving operational efficiency and smoothness. The spherical design of the inner side of the abutment block 22 helps to provide a more uniform contact force, further enhancing the stability of the connection and avoiding wear or imbalance caused by uneven contact.

[0036] In this embodiment, the main function of the reinforcing mechanism is to enhance the connection stability between the main beam 3 and the suspension 2, ensuring that the lifting system 4 can operate safely and efficiently. The reinforcing mechanism consists of a first fixed plate 5, a second fixed plate 6, a hinge frame 7, and a safety cable 8. The first fixed plate 5 is installed on the top surface of the main beam 3, and the second fixed plate 6 is installed on the side wall of the suspension 2. The two sets of hinge frames 7 are rotatably connected to the first fixed plate 5 and the second fixed plate 6, respectively, serving as support and connection. The two ends of the safety cable 8 are connected to the two sets of hinge frames 7 through a quick-connect mechanism, ensuring that the two are always tightly connected. By providing additional support force, the reinforcing mechanism avoids excessive offset or deformation between the main beam 3 and the suspension 2, thereby improving the stability and safety of the overall structure. When the safety cable 8 needs to be replaced, the locking mechanism on the rotating sleeve 17 is released, and rotating the rotating sleeve 17 drives multiple sets of guide blocks 19 to rotate. The multiple sets of guide blocks 19 slide in cooperation with the spiral groove 18. This causes the sliding sleeve 16 to slide along the sliding groove 15. The sliding sleeve 16 pushes the locking sleeve 20 to release its contact with the bottom of the multiple sets of connecting rods 14. At the same time, it contacts the multiple sets of abutment blocks 22 through the inclined surface 23 and pushes the abutment blocks 22 to move outward, stretching the tension spring 21. The abutment blocks 22 drive the connecting rod 14 and the multiple sets of locking blocks 12 to move outward, causing the multiple sets of locking blocks 12 to disengage from the locking groove 13, releasing the locking of the insertion rod 10. Then the safety rope 8 can be disassembled. When it needs to be reinstalled, the insertion rod 10 is inserted. Inside the fixed sleeve 11, the rotating sleeve 17 rotates in the opposite direction and slides with the spiral groove 18 through multiple sets of guide blocks 19, causing the sliding sleeve 16 to slide upward along the sliding groove 15, releasing the contact of multiple sets of inclined surfaces 23 to the abutment block 22. Multiple sets of tension springs 21 pull the connecting rod 14 to reset, causing multiple sets of locking blocks 12 to engage in the locking groove 13. At the same time, the locking sleeve 20 abuts against the bottom of multiple sets of connecting rods 14. Finally, the rotating sleeve 17 is locked by the positioning mechanism, completing the replacement and installation of the safety rope 8.

[0037] Please see Figures 4-5 As one implementation of the positioning mechanism: a positioning mechanism is provided on the outer wall of the fixed sleeve 11. The positioning mechanism includes a mounting ring 24, a positioning block 25, a return spring 26, a positioning groove 27, a pressure sleeve 28, and a push spring 29. The mounting ring 24 is mounted on the outer wall of the fixed sleeve 11. Multiple sets of positioning blocks 25 are slidably mounted on the mounting ring 24. Multiple sets of return springs 26 are respectively mounted on the inner side of multiple sets of positioning blocks 25 and connected to the outer wall of the mounting ring 24. Multiple sets of positioning grooves 27 are respectively provided on the outer wall of the rotating sleeve 17. The pressure sleeve 28 slides on the outer wall of the fixed sleeve 11. Multiple sets of push springs 29 are provided and their two ends are respectively connected to the pressure sleeve 28 and the fixed sleeve 11.

[0038] The outer walls of multiple positioning blocks 25 and the bottom of the pressure sleeve 28 are all provided with rounded corners. The rounded corner design reduces the friction between the positioning blocks 25 and the bottom of the pressure sleeve 28, avoids jamming, wear or damage that may be caused by sharp angle contact, and makes the pressure sleeve 28 more stable during positioning, ensuring the stability and durability of the entire positioning mechanism and reducing possible failures during long-term use.

[0039] More specifically, multiple sets of push springs 29 push the pressure sleeve 28 against the outside of multiple sets of positioning blocks 25, so that the bottom end of the multiple sets of positioning blocks 25 is engaged in the positioning groove 27 and squeezes the multiple sets of return springs 26, thereby restricting the position of the rotating sleeve 17. When unlocking is required, the locking sleeve 20 is pushed upward to release the contact with the top end of the multiple sets of positioning blocks 25. The elastic return of the return springs 26 pushes the positioning blocks 25 outward, so that the bottom end of the multiple sets of positioning blocks 25 disengages from the positioning groove 27 and releases the lock on the rotating sleeve 17.

[0040] In summary, during the use or operation of the overall equipment: the main function of the reinforcing mechanism is to enhance the connection stability between the main beam 3 and the suspension 2, ensuring that the lifting system 4 can operate safely and efficiently. The reinforcing mechanism consists of a first fixed plate 5, a second fixed plate 6, hinge frames 7, and a safety cable 8. The first fixed plate 5 is installed on the top surface of the main beam 3, and the second fixed plate 6 is installed on the side wall of the suspension 2. The two sets of hinge frames 7 are rotatably connected to the first fixed plate 5 and the second fixed plate 6, respectively, serving as support and connection. The two ends of the safety cable 8 are connected to the two sets of hinge frames 7 through quick-connect mechanisms, ensuring that the two always maintain a tight connection. By providing additional support force, the reinforcing mechanism avoids excessive offset or deformation between the main beam 3 and the suspension 2, thereby improving the stability and safety of the overall structure. When the safety cable 8 needs to be replaced, the locking mechanism on the rotating sleeve 17 is released, and rotating the rotating sleeve 17 drives multiple sets of guide blocks 19 to rotate. The multiple sets of guide blocks 19 slide against the spiral groove 18. The sliding sleeve 16 slides along the sliding groove 15, pushing the locking sleeve 20 to release its contact with the bottom of the multiple sets of connecting rods 14. Simultaneously, it contacts the multiple sets of abutment blocks 22 via the inclined surface 23, pushing the abutment blocks 22 outward and stretching the tension spring 21. The abutment blocks 22 drive the connecting rods 14 and the multiple sets of locking blocks 12 outward, causing the multiple sets of locking blocks 12 to disengage from the locking groove 13, releasing the locking of the insertion rod 10. Then, the safety rope 8 can be disassembled. When reinstallation is required, the insertion rod 10 can be... Inserted into the fixed sleeve 11, the rotating sleeve 17 is rotated in the opposite direction and slides with the spiral groove 18 through multiple sets of guide blocks 19, so that the sliding sleeve 16 slides upward along the sliding groove 15, releasing the abutment of the multiple sets of inclined surfaces 23 against the abutment block 22. The connecting rod 14 is reset by multiple sets of tension springs 21, so that multiple sets of locking blocks 12 are locked in the locking groove 13. At the same time, the locking sleeve 20 is pressed against the bottom of the multiple sets of connecting rods 14. Finally, the rotating sleeve 17 is locked by the positioning mechanism, completing the replacement and installation of the safety rope 8.

[0041] Multiple sets of push springs 29 push the pressure sleeve 28 against the outside of multiple sets of positioning blocks 25, so that the bottom end of the multiple sets of positioning blocks 25 is engaged in the positioning groove 27 and squeezes the multiple sets of return springs 26, thereby restricting the position of the rotating sleeve 17. When unlocking is required, push the locking sleeve 20 upward to release the contact with the top end of the multiple sets of positioning blocks 25. The elastic return of the return springs 26 pushes the positioning blocks 25 outward, so that the bottom end of the multiple sets of positioning blocks 25 disengages from the positioning groove 27 and releases the lock on the rotating sleeve 17.

[0042] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A safety-type cantilever crane, comprising a support column (1), characterized in that: A suspension (2) is installed on the locking support column (1), a main beam (3) is installed on the suspension (2), a lifting system (4) is installed on the main beam (3), and a reinforcing mechanism is provided between the main beam (3) and the suspension (2). The reinforcing mechanism includes a first fixing plate (5), a second fixing plate (6), a hinge frame (7), and a safety rope (8). The first fixing plate (5) is installed on the top surface of the main beam (3), the second fixing plate (6) is installed on the side wall of the suspension (2), the hinge frame (7) is provided with two sets of rotatably connecting the first fixing plate (5) and the second fixing plate (6), and quick-connect machines are provided at both ends of the safety rope (8). The quick-release mechanism is connected to two sets of hinge frames (7). The quick-release mechanism includes a connecting block (9), a plug rod (10), a fixing sleeve (11), a locking block (12), a slot (13), a connecting rod (14), and a locking mechanism. The connecting block (9) is installed at both ends of the safety rope (8). The plug rod (10) is installed at the top of the two sets of connecting blocks (9). The fixing sleeve (11) is installed on the top surface of the two sets of hinge frames (7). The locking block (12) is provided with multiple sets that slide on the inner wall of the two sets of fixing sleeves (11). The slot (13) is provided on the outer wall of the two sets of plug rods (10). The connecting rod (14) is provided with multiple sets that are installed on the top of the multiple sets of locking blocks (12).

2. A safety-type cantilever crane according to claim 1, characterized in that: The locking mechanism includes a sliding groove (15), a sliding sleeve (16), a rotating sleeve (17), a spiral groove (18), a guide block (19), and a locking sleeve (20). The sliding groove (15) is provided on the outer wall of the fixed sleeve (11), the sliding sleeve (16) slides in the sliding groove (15), the rotating sleeve (17) is rotatably installed on the outer wall of the fixed sleeve (11), the spiral groove (18) is provided on the outer wall of the sliding sleeve (16), the guide block (19) is provided with multiple sets installed on the inner wall of the rotating sleeve (17) and slidably connected to the spiral groove (18), and the locking sleeve (20) is installed at the bottom end of the sliding sleeve (16) and abuts against the bottom ends of multiple sets of connecting rods (14).

3. A safety-type cantilever crane according to claim 2, characterized in that: multiple sets The bottom end of the connecting rod (14) and the inner wall of the lock sleeve (20) are both provided with inclined surfaces (23) and abut against each other.

4. A safety-type cantilever crane according to claim 3, characterized in that: The inner side of the spiral groove (18) and the guide block (19) are both set in an arc shape.

5. A safety-type cantilever crane according to claim 4, characterized in that: multiple sets A tension spring (21) is provided between the inner side of the connecting rod (14) and the outer wall of the fixing sleeve (11).

6. A safety-type cantilever crane according to claim 5, characterized in that: multiple sets Each of the connecting rods (14) is equipped with an abutment block (22) at its top end, and the sliding sleeve (16) is provided with an inclined surface (23). The inner sides of the multiple sets of abutment blocks (22) are all spherical.

7. A safety-type cantilever crane according to claim 6, characterized in that: The outer wall of the fixed sleeve (11) is provided with a positioning mechanism, which includes an installation ring (24), a positioning block (25), a return spring (26), a positioning groove (27), a pressure sleeve (28), and a push spring (29). The installation ring (24) is installed on the outer wall of the fixed sleeve (11). Multiple sets of positioning blocks (25) are provided and slidably installed on the installation ring (24). Multiple sets of return springs (26) are provided and are respectively installed on the inner side of multiple sets of positioning blocks (25) and connected to the outer wall of the installation ring (24). Multiple sets of positioning grooves (27) are provided and are respectively provided on the outer wall of the rotating sleeve (17). The pressure sleeve (28) slides on the outer wall of the fixed sleeve (11). Multiple sets of push springs (29) are provided and their two ends are respectively connected to the pressure sleeve (28) and the fixed sleeve (11).

8. A safety-type cantilever crane according to claim 7, characterized in that: The outer walls of the multiple positioning blocks (25) and the bottom of the pressure sleeve (28) are all provided with rounded corners.

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