Safe lifting appliance for steel coil crane

Abstract

The invention discloses a safe hoisting sling for a steel coil crane, and relates to the technical field of hoisting slings, the safe hoisting sling comprises a box body, a portal frame is fixedly mounted on the outer upper wall surface of the box body, a hanging ring is fixedly mounted on the outer upper wall surface of the portal frame, and a first motor is fixedly mounted on the inner upper wall surface of the portal frame of the box body; after a hanging ring is connected with an external lifting device, a first motor is started to drive a linkage assembly to move, the two ends of the linkage assembly drive vertical plates to move oppositely, the vertical plates can make contact with the two wall faces of a steel coil, meanwhile, a hanging rod is inserted into the center of the steel coil, and the steel coil is hung on the hanging rod. The first motor is stopped until the triggering assembly on the vertical plate is in contact with the steel coil, at the moment, the steel coil is subjected to inner diameter clamping and fixing through the centering and fixing assembly, the triggering assembly on the arc-shaped plate is in contact with the inner diameter of the steel coil and the centering and fixing assembly is stopped until the arc-shaped plate is in contact with the inner diameter of the steel coil, and clamping and fixing of the steel coil are completed; and the steel coil is convenient to hoist.

Description

Technical Field

[0001] The invention relates to the technical field of lifting slings, in particular to a safe lifting sling for a steel coil crane. Background Art

[0002] In the fields of steel metallurgy, processing, storage and transportation, the safe lifting of steel coils is a crucial link, which is directly related to production efficiency, equipment safety and the personal safety of operators. Currently, the lifting equipment used for steel coil cranes on the market mostly adopts the traditional clamping and fixing method; Existing steel coil lifting equipment typically only secures the outer surface of the coil using clamping structures on both sides. In this case, the lifting shaft is simply inserted into the center of the coil. However, this fixing method has obvious technical flaws. Once the coil is lifted, it is prone to shaking during the lifting process due to the lack of effective clamping and centering devices on the inner diameter of the coil. The swaying of steel coils can cause a series of serious problems. On the one hand, it greatly reduces the stability of the sling holding the steel coil, making the steel coil at risk of falling during the lifting process, seriously threatening production safety. On the other hand, the swaying may also cause scratches, deformation and other damage to the surface of the steel coil, affecting the quality of the steel coil and subsequent processing and use. In addition, the unstable lifting state will also cause additional impact and wear on the crane equipment itself, shortening the equipment's service life and increasing maintenance costs. In summary, due to the limitations of the structural design, the existing steel coil lifting slings are unable to achieve multi-directional and stable clamping and fixation of the steel coils. The steel coils are prone to shaking during the lifting process, resulting in poor fixing stability, and can no longer meet the needs of modern industrial production for safe and efficient lifting of steel coils. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention provides a safe lifting sling for a steel coil crane, which solves the technical problem that the existing sling, when in use, only clamps and fixes the steel coil on the left and right sides, and the lifting shaft is only inserted into the steel coil. During the lifting process of the steel coil, it is easy to shake, which leads to the steel coil not being effectively fixed, thereby reducing the stability of the sling in fixing the steel coil.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: A steel coil crane safety lifting sling, comprising a box body, a gantry is fixedly installed on the outer upper wall of the box body, a hanging ring is fixedly installed on the outer upper wall of the gantry, a first motor is fixedly installed on the inner upper wall of the box body gantry, a linkage assembly is provided in the box body, the linkage assembly is connected to the first motor, both sides of the box body linkage assembly respectively pass through the box body, vertical plates are respectively fixedly installed on the through ends of the linkage assembly, a hanging rod is fixedly installed on the lower end of the vertical plate, a centering fixing assembly is provided on the hanging rod, three arc plates are provided on the hanging rod, the three arc plates are connected to the centering fixing assembly, and trigger assemblies are respectively provided on the arc plate and the vertical plate.

[0005] Preferably, the linkage assembly includes a shaft, which is rotatably mounted on the lower wall of the box body, the upper end of the shaft passes through the upper wall of the box body and is fixedly mounted with a driven gear, the driving end of the first motor is fixedly mounted with a driving gear, the driving gear is meshed with the driven gear, the driving gear is fixedly mounted on the shaft, the driving gear is located in the box body, the upper and lower walls of the box body and on one side of the gear are provided with a first dovetail groove, the first dovetail rod is slidably mounted in the first dovetail groove, the first dovetail rod passes through the side wall of the box body, a first movable plate is fixedly mounted between the first dovetail rods, and the first movable plate The first rack is fixedly installed on the first movable plate and is meshed with the driving gear. The upper and lower walls of the box body are provided with a second dovetail groove on the other side of the gear. The second dovetail rod is slidably installed in the second dovetail groove. The second dovetail rod passes through the other side wall of the box body. The second movable plate is fixedly installed between the second dovetail rods. The second movable plate passes through the other side wall of the box body. The second rack is fixedly installed on the second movable plate and is meshed with the driving gear. The vertical plates are respectively fixedly installed on the first movable plate and the through-end of the second movable plate.

[0006] Preferably, the driving gear is engaged with the first rack and the second rack at the same time, and the first dovetail rod slides in the first dovetail groove to drive the first movable plate to move toward one side of the steel coil, and the second dovetail rod slides in the second dovetail groove to drive the second movable plate to move to the other side of the steel coil, and the vertical plates on both sides move toward each other with the first movable plate and the second movable plate until the side walls of the vertical plates contact the outer walls of the steel coil.

[0007] Preferably, the driving gear and the driven gear are both bevel gear structures.

[0008] Preferably, the first motor is started to drive the driving gear to rotate, the driving gear is engaged with the driven gear, and the power is transmitted to the shaft, and the shaft drives the driving gear to rotate in the box.

[0009] Preferably, the centering and fixing assembly includes a second motor, an inner cavity is opened on the suspension rod, the second motor is fixedly installed on the side wall of the suspension rod, the driving end of the second motor passes through the suspension rod and is fixedly installed with a bidirectional screw, the other end of the bidirectional screw is rotatably installed on the other side wall of the inner cavity, three openings are opened on the inner cavity, a pair of moving blocks are meshed and connected to the bidirectional screw, and three connecting rods are respectively hinged on the moving blocks, and one end of the connecting rod passes through the opening and is hinged to the lower wall of the arc plate.

[0010] Preferably, the two ends of the lower wall of the arc-shaped plate are respectively fixedly mounted with limit rods, a limit hole is provided on the hanging rod, and the lower end of the limit rod passes through the limit hole and is fixedly mounted with the limit plate.

[0011] Preferably, the trigger assembly includes a trigger plate, and the side walls of the vertical plate and the upper wall of the curved plate are respectively provided with mounting grooves, a guide rod is fixedly installed on the lower wall of the mounting groove, and the trigger plate is inserted into the mounting groove, a cavity is provided on the mounting groove and above the guide rod, a guide hole is provided on the lower wall of the cavity, the guide rod passes through the guide hole and a baffle is fixedly installed on the upper end, a spring is fixedly installed between the baffle and the upper wall of the cavity, and a pressure sensor is fixedly installed in the mounting groove and on one side of the guide rod.

[0012] Preferably, after the trigger plate on the vertical plate contacts the outer wall of the steel coil, the trigger plate compresses the spring along the guide rod, and the baffle drives the guide rod to move upward until the lower wall of the trigger plate presses the pressure sensor, and the pressure sensor sends a signal to the controller to control the first motor to stop rotating, thereby completing the preliminary fixation of the outer side of the steel coil.

[0013] Preferably, an alarm is fixedly mounted on the outer upper wall of the box body and located on one side of the first motor.

[0014] Beneficial effect: The present invention provides a safe lifting sling for steel coil crane, which solves the technical problem that the existing sling, when in use, only clamps and fixes the steel coil on the left and right, and the lifting shaft is only inserted in the steel coil, which is prone to shaking during the lifting process of the steel coil, thereby causing the steel coil to not be effectively fixed, thereby reducing the stability of the sling in fixing the steel coil. After the present invention is connected to the external lifting device through a hanging ring, the first motor is started to drive the linkage component to move, and the two ends of the linkage component drive the vertical plates to move toward each other, and enable the vertical plates to contact the two wall surfaces of the steel coil. At the same time, the hanging rod is inserted into the center of the steel coil until the trigger component on the vertical plate contacts the steel coil, and the first motor is stopped. At this time, the inner diameter of the steel coil is clamped and fixed by the centering and fixing component until the arc plate avoids contact with the inside of the steel coil, the trigger component on the arc plate contacts the inner diameter of the steel coil, the centering and fixing component stops, and the clamping and fixation of the steel coil is completed, which is convenient for lifting the steel coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the main structure of a steel coil crane safety lifting device described in the present invention.

[0016] Figure 2 The present invention provides a schematic cross-sectional view of the gantry structure of a steel coil crane for safely lifting a sling.

[0017] Figure 3 This is a schematic diagram of the longitudinal cross-sectional structure of a box body of a steel coil crane safety lifting sling according to the present invention.

[0018] Figure 4 This is a schematic diagram of the transverse cross-sectional structure of a box body of a steel coil crane safety lifting sling according to the present invention.

[0019] Figure 5 The present invention provides a schematic structural diagram of a centering and fixing assembly for a safe lifting device of a steel coil crane.

[0020] Figure 6 The present invention provides a schematic cross-sectional view of a centering and fixing assembly for a safe lifting device for a steel coil crane.

[0021] Figure 7 The present invention provides a schematic diagram of the transverse cross-sectional structure of a centering and fixing assembly of a steel coil crane safety lifting device.

[0022] In the figure: 1. Box; 2. Gantry; 3. Hanging ring; 4. First motor; 5. Vertical plate; 6. Suspension rod; 7. Arc plate; 8. Shaft; 9. Driven gear; 10. Driving gear; 11. Driving gear; 12. First dovetail groove; 13. First dovetail rod; 14. First movable plate; 15. First rack; 16. Second dovetail groove; 17. Second dovetail rod; 18. Second movable plate; 19. Second rack; 20. Second motor; 21. Bidirectional screw; 22. Moving block; 23. Connecting rod; 24. Limit rod; 25. Limit plate; 26. Trigger plate; 27. Guide rod; 28. Baffle; 29. Spring; 30. Pressure sensor. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] See also Figure 1-Figure 7The present invention provides a technical solution: a steel coil crane safety lifting sling, comprising a box body 1, a gantry 2 is fixedly installed on the outer upper wall of the box body 1, a hanging ring 3 is fixedly installed on the outer upper wall of the gantry 2, a first motor 4 is fixedly installed on the inner upper wall of the gantry 2 of the box body 1, a linkage component is provided in the box body 1, the linkage component is connected to the first motor 4, the two sides of the linkage component of the box body 1 respectively pass through the box body 1, and vertical plates 5 are fixedly installed on the through ends of the linkage component, and a hanging rod 6 is fixedly installed on the lower end of the vertical plate 5, a centering fixing component is provided on the hanging rod 6, and three arc plates 7 are provided on the hanging rod 6, and the three arc plates 7 are connected to the centering fixing component, and trigger components are respectively provided on the arc plate 7 and the vertical plate 5.

[0025] After being connected to the external lifting device through the hanging ring 3, the first motor 4 is started to drive the linkage assembly to move, and the two ends of the linkage assembly drive the vertical plates 5 to move toward each other, and make the vertical plates 5 contact with the two walls of the steel coil. At the same time, the hanging rod 6 is inserted into the center of the steel coil until the trigger assembly on the vertical plate 5 contacts the steel coil, and then the first motor 4 is stopped. At this time, the inner diameter of the steel coil is clamped and fixed by the centering and fixing assembly until the arc plate 7 avoids contact with the inside of the steel coil. The trigger assembly on the arc plate 7 contacts the inner diameter of the steel coil, and the centering and fixing assembly stops, completing the clamping and fixing of the steel coil, which is convenient for lifting the steel coil.

[0026] This embodiment is further configured as follows: the linkage assembly includes a shaft 8, which is rotatably mounted on the lower wall of the box body 1, and the upper end of the shaft 8 passes through the upper wall of the box body 1 and is fixedly mounted with a driven gear 9. The driving end of the first motor 4 is fixedly mounted with a driving gear 10, and the driving gear 10 is meshed with the driven gear 9. A driving gear 11 is fixedly mounted on the shaft 8, and the driving gear 11 is located in the box body 1. A first dovetail groove 12 is provided on the upper and lower walls of the box body 1 and on one side of the gear. A first dovetail rod 13 is slidably mounted in the first dovetail groove 12, and the first dovetail rod 13 passes through the side wall of the box body 1. A first movable plate 14 is fixedly mounted between the first dovetail rods 13, and the first movable plate 1 4 passes through the side wall of the box body 1, a first rack 15 is fixedly mounted on the first movable plate 14, the first rack 15 is meshed with the driving gear 11, and second dovetail grooves 16 are provided on the upper and lower walls of the box body 1 and on the other side of the gear, a second dovetail rod 17 is slidably mounted in the second dovetail groove 16, the second dovetail rod 17 passes through the other side wall of the box body 1, a second movable plate 18 is fixedly mounted between the second dovetail rods 17, the second movable plate 18 passes through the other side wall of the box body 1, a second rack 19 is fixedly mounted on the second movable plate 18, the second rack 19 is meshed with the driving gear 11, and the vertical plates 5 are respectively fixedly mounted on the through ends of the first movable plate 14 and the second movable plate 18.

[0027] Start the first motor 4, and the driving end of the first motor 4 drives the driving gear 10 to rotate. The driving gear 10 is meshed and connected with the driven gear 9, so that when the driving gear 10 rotates, it has a driving effect on the driven gear 9, and the driven gear 9 drives the shaft 8 to rotate. At this time, the shaft 8 drives the driving gear 11 to rotate. Since the first rack 15 and the second rack 19 are meshed and connected with the driving gear 11, when the driving gear 11 rotates, it has a driving effect on the first rack 15 and the second rack 19. The first rack 15 and the second rack 19 respectively drive the first movable plate 14 and the second movable plate 18 to move along the first dovetail groove 12 and the second dovetail groove 16 paths under the action of the first dovetail rod 13 and the second dovetail rod 17, so that the vertical plates 5 move toward each other.

[0028] This embodiment is further configured such that both the driving gear 10 and the driven gear 9 are bevel gear structures.

[0029] This embodiment is further configured as follows: the centering and fixing assembly includes a second motor 20, an inner cavity is provided on the suspension rod 6, the second motor 20 is fixedly installed on the side wall of the suspension rod 6, the driving end of the second motor 20 passes through the suspension rod 6 and is fixedly installed with a bidirectional screw 21, the other end of the bidirectional screw 21 is rotatably installed on the other side wall of the inner cavity, three openings are provided on the bidirectional screw 21, a pair of moving blocks 22 are meshed and connected on the two-way screw 21, and three connecting rods 23 are respectively hinged on the moving blocks 22, and one end of the connecting rod 23 passes through the opening and is hinged to the arc The lower wall of the plate 7; start the second motor 20, and the driving end of the second motor 20 drives the bidirectional screw 21 to rotate. Since the bidirectional screw 21 is meshed with a moving block 22, the bidirectional screw 21 has a driving effect on the moving block 22. Since the moving block 22 is hinged with a connecting rod 23, the moving blocks 22 move toward each other while the connecting rod 23 performs a supporting movement. Under the action of the opening, the connecting rod 23 not only limits the moving block 22, but also allows the connecting rod 23 to be moved out of the opening. At this time, the connecting rod 23 supports the curved plate 7 until the curved plate 7 contacts the inner diameter of the steel coil.

[0030] This embodiment is further configured such that limiting rods 24 are fixedly installed at both ends of the lower wall of the arc-shaped plate 7, a limiting hole is provided on the hanging rod 6, the lower end of the limiting rod 24 passes through the limiting hole and is fixedly installed with a limiting plate 25; the limiting rod 24 enables the arc-shaped plate 7 to move straight up and down.

[0031] This embodiment is further configured as follows: the trigger assembly includes a trigger plate 26, and mounting grooves are respectively provided on the side walls of the vertical plate 5 and the upper wall of the curved plate 7. A guide rod 27 is fixedly installed on the lower wall of the mounting groove. The trigger plate 26 is inserted into the mounting groove, and a cavity is provided on the mounting groove and above the guide rod 27. A guide hole is provided on the lower wall of the cavity. The guide rod 27 passes through the guide hole and a baffle 28 is fixedly installed on the upper end. A spring 29 is fixedly installed between the baffle 28 and the upper wall of the cavity. A pressure sensor 30 is fixedly installed in the mounting groove and on one side of the guide rod 27.

[0032] When the vertical plate 5 and the curved plate 7 respectively contact the outer wall and inner diameter of the steel coil, the contact plate first contacts the outer wall and inner diameter of the steel coil respectively. At this time, the spring 29 is squeezed, causing the guide rod 27 to enter the cavity until the lower wall of the contact plate contacts the pressure sensor 30. At this time, the pressure sensor 30 detects the pressure signal, and the pressure signal is transmitted to the external controller.

[0033] This embodiment is further configured such that an alarm is fixedly mounted on the outer upper wall of the box body 1 and located on one side of the first motor 4 .

[0034] The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process. The specific operations are as follows.

[0035] Embodiment: According to the drawings in the specification, after being connected to the external lifting device through the hanging ring 3, by starting the first motor 4, the driving end of the first motor 4 drives the driving gear 10 to rotate, and the driving gear 10 is meshed and connected with the driven gear 9, so that when the driving gear 10 rotates, it has a driving effect on the driven gear 9, and the driven gear 9 drives the shaft 8 to rotate. At this time, the shaft 8 drives the driving gear 11 to rotate. Since the first rack 15 and the second rack 19 are meshed and connected with the driving gear 11, when the driving gear 11 rotates, the first rack 15 and the second rack 19 are meshed and connected. The rack 19 has a driving function. The first rack 15 and the second rack 19 respectively drive the first movable plate 14 and the second movable plate 18 to move along the first dovetail groove 12 and the second dovetail groove 16 under the action of the first dovetail rod 13 and the second dovetail rod 17, so that the vertical plate 5 moves toward each other and the vertical plate 5 can contact the two walls of the steel coil. At the same time, the hanging rod 6 is inserted into the center of the steel coil until the trigger plate 26 on the vertical plate 5 contacts the two side walls of the steel coil. At this time, the spring 29 is squeezed, causing the guide rod 27 to enter the cavity until it contacts the lower wall of the plate. The surface is in contact with the pressure sensor 30. At this time, the pressure sensor 30 detects a pressure signal, and the pressure signal is transmitted to the external controller. The external sensor controls the first motor 4 to stop working and starts the second motor 20. The driving end of the second motor 20 drives the bidirectional screw 21 to rotate. Since the bidirectional screw 21 is meshed with a moving block 22, the bidirectional screw 21 has a driving effect on the moving block 22. Since the moving block 22 is hinged with a connecting rod 23, the moving block 22 moves toward each other while the connecting rod 23 supports the moving block. Under the action of the opening, the connecting rod 23 not only supports the moving block 22 but also supports the moving block 22. 22 plays a limiting role, and allows the connecting rod 23 to move out of the opening. At this time, the connecting rod 23 supports the arc plate 7 until the arc plate 7 contacts the inner diameter of the steel coil, and the contact plate on the arc plate 7 contacts the inner diameter of the steel coil. At this time, the spring 29 is squeezed, causing the guide rod 27 to enter the cavity until the lower wall of the contact plate contacts the pressure sensor 30. At this time, the pressure sensor 30 detects a pressure signal, and the pressure signal is transmitted to the external controller. At this time, the external controller controls the second motor 20 to stop rotating, completing the clamping and fixation of the steel coil, which is convenient for the lifting of the steel coil.

[0036] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

Claims

1. A steel coil crane safety lifting device, comprising a box (1), characterized in that: A gantry (2) is fixedly mounted on the outer upper wall of the box (1), a hanging ring (3) is fixedly mounted on the outer upper wall of the gantry (2), a first motor (4) is fixedly mounted on the inner upper wall of the gantry (2) of the box (1), a linkage assembly is provided in the box (1), the linkage assembly is connected to the first motor (4), both sides of the linkage assembly of the box (1) respectively penetrate the box (1), vertical plates (5) are fixedly mounted on the through ends of the linkage assembly, a hanging rod (6) is fixedly mounted on the lower end of the vertical plate (5), a centering fixing assembly is provided on the hanging rod (6), three arc plates (7) are provided on the hanging rod (6), the three arc plates (7) are connected to the centering fixing assembly, and trigger assemblies are provided on the arc plates (7) and the vertical plates (5).

2. A steel coil crane safety lifting device according to claim 1, characterized in that: The linkage assembly includes a shaft (8), the shaft (8) is rotatably mounted on the lower wall of the box (1), the upper end of the shaft (8) passes through the upper wall of the box (1) and is fixedly mounted with a driven gear (9), the driving end of the first motor (4) is fixedly mounted with a driving gear (10), the driving gear (10) is meshed and connected with the driven gear (9), the shaft (8) is fixedly mounted with a driving gear (11), the driving gear (11) is located in the box (1), the upper and lower walls of the box (1) are provided with a first dovetail groove (12) on one side of the gear, a first dovetail rod (13) is slidably mounted in the first dovetail groove (12), the first dovetail rod (13) passes through the side wall of the box (1), a first movable plate (14) is fixedly mounted between the first dovetail rods (13), and the first movable plate (14) passes through the box The first rack (15) is fixedly mounted on the side wall of the box body (1), and the first rack (15) is meshed with the driving gear (11). A second dovetail groove (16) is provided on the upper and lower walls of the box body (1) and is located on the other side of the gear. A second dovetail rod (17) is slidably mounted in the second dovetail groove (16), and the second dovetail rod (17) passes through the other side wall of the box body (1). A second moving plate (18) is fixedly mounted between the second dovetail rods (17), and the second moving plate (18) passes through the other side wall of the box body (1). A second rack (19) is fixedly mounted on the second moving plate (18), and the second rack (19) is meshed with the driving gear (11). The vertical plate (5) is fixedly mounted on the through ends of the first moving plate (14) and the second moving plate (18).

3. A steel coil crane safety lifting device according to claim 2, characterized in that: The driving gear (11) is engaged with the first rack (15) and the second rack (19) at the same time, and slides in the first dovetail groove (12) through the first dovetail rod (13), thereby driving the first movable plate (14) to move toward one side of the steel coil, and slides in the second dovetail groove (16) through the second dovetail rod (17), thereby driving the second movable plate (18) to move toward the other side of the steel coil. The vertical plates (5) on both sides move toward each other with the first movable plate (14) and the second movable plate (18) until the side walls of the vertical plates (5) contact the outer side walls of the steel coil.

4. A steel coil crane safety lifting device according to claim 3, characterized in that: The driving gear (10) and the driven gear (9) are both bevel gear structures.

5. A steel coil crane safety lifting device according to claim 4, characterized in that: The first motor (4) is started to drive the driving gear (10) to rotate, and the driving gear (10) is engaged with the driven gear (9) to transmit power to the shaft (8), and the shaft (8) drives the driving gear (11) to rotate in the box (1).

6. A steel coil crane safety lifting device according to claim 5, characterized in that: The centering and fixing assembly includes a second motor (20), an inner cavity is provided on the suspension rod (6), the second motor (20) is fixedly mounted on the side wall of the suspension rod (6), the driving end of the second motor (20) passes through the suspension rod (6) and is fixedly mounted with a bidirectional screw (21), the other end of the bidirectional screw (21) is rotatably mounted on the other side wall of the inner cavity, three openings are provided on the inner cavity, a pair of moving blocks (22) are meshedly connected on the bidirectional screw (21), and three connecting rods (23) are respectively hinged on the moving blocks (22), and one end of the connecting rod (23) passes through the opening and is hinged to the lower wall of the arc plate (7).

7. A steel coil crane safety lifting device according to claim 6, characterized in that: Limiting rods (24) are fixedly mounted on both ends of the lower wall of the arc-shaped plate (7), a limiting hole is provided on the hanging rod (6), and the lower end of the limiting rod (24) passes through the limiting hole and is fixedly mounted on the limiting plate (25).

8. A steel coil crane safety lifting device according to claim 7, characterized in that: The trigger assembly includes a trigger plate (26), a side wall of the vertical plate (5) and an upper wall of the arc plate (7) are respectively provided with mounting grooves, a guide rod (27) is fixedly installed on the lower wall of the mounting groove, the trigger plate (26) is inserted into the mounting groove, a cavity is provided on the mounting groove and above the guide rod (27), a guide hole is provided on the lower wall of the cavity, the guide rod (27) passes through the guide hole and a baffle (28) is fixedly installed on the upper end, a spring (29) is fixedly installed between the baffle (28) and the upper wall of the cavity, and a pressure sensor (30) is fixedly installed in the mounting groove and on one side of the guide rod (27).

9. A steel coil crane safety lifting device according to claim 8, characterized in that: After the trigger plate (26) on the vertical plate (5) contacts the outer wall of the steel coil, the trigger plate (26) compresses the spring (29) along the guide rod (27), and the baffle (28) drives the guide rod (27) to move upward until the lower wall of the trigger plate (26) presses the pressure sensor (30). The pressure sensor (30) sends a signal to the controller to control the first motor (4) to stop rotating, thereby completing the preliminary fixation of the outer side of the steel coil.

10. A steel coil crane safety lifting device according to claim 9, characterized in that: An alarm is fixedly mounted on the outer upper wall of the box body (1) and located on one side of the first motor (4).

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