Adjustable combined slewing crane

Abstract

The utility model discloses an adjustable combined jib crane, which relates to the field of cranes, and comprises a pair of supporting seats, the surfaces of the pair of supporting seats are fixedly connected with cantilever supports, the surfaces of the cantilever supports are slidably connected with a plurality of sliding plates, the surfaces of the plurality of sliding plates are fixedly connected with the same mounting plate, and the mounting plate is fixedly connected with the cantilever supports. A winding shaft and an L-shaped plate are mounted above the mounting plate, and a sliding sleeve slides on the surface of the winding shaft. The lifting hook hooks an object, and in the ascending process, if the load of the motor fails, the pawl limits the ratchet wheel and prevents the ratchet wheel from rotating reversely at the moment, so that the winding shaft is prevented from rotating reversely, the lifting hook is prevented from falling off, and protection is carried out, and when descending is needed, the electric telescopic rod is started firstly, the sliding sleeve and the ratchet wheel are pushed to move integrally, and the ratchet wheel is separated from the pawl; the first motor drives the output end of the first motor to rotate reversely, so that falling operation of the lifting hook is realized, and personnel danger and property loss caused by sudden falling of the lifting hook due to overload failure of the first motor are prevented.

Description

Technical Field

[0001] This utility model relates to the field of cranes, and in particular to an adjustable combined jib crane. Background Technology

[0002] A crane is a multi-action lifting machine used for vertically lifting and horizontally moving heavy objects. It is widely used in warehouses, docks, stations, mines, construction sites, and other places. It uses hooks or other lifting devices to suspend heavy objects and perform cyclical operations such as lifting, moving, and transporting in space, and belongs to the category of material handling machinery.

[0003] Existing cranes use motors to drive steel cables to rotate and wind, thus lifting objects. During the lifting process, the motor is under load. If the object is suspended in the air for a long time, the motor will overload and overheat, causing control failure and the object to fall, resulting in personal injury and property damage. To address these issues, an adjustable combined jib crane is needed. Utility Model Content

[0004] The purpose of this invention is to provide an adjustable combined jib crane to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an adjustable combined jib crane, comprising a pair of support seats, a cantilever frame fixedly connected to the surface of each pair of support seats, a plurality of sliding plates slidably connected to the surface of the cantilever frame, a common mounting plate fixedly connected to the surface of the plurality of sliding plates, a winding shaft and an L-shaped plate mounted above the mounting plate, a sliding sleeve slidably connected to the surface of the winding shaft, and a support and protection mechanism mounted on the surface of the sliding sleeve;

[0006] The support and protection mechanism includes a ratchet fixedly connected to the surface of the sliding sleeve, a return spring fixedly connected to the surface of the L-shaped plate, a pawl fixedly connected to the bottom end of the return spring, the inner wall of the pawl being rotatably connected to the surface of the L-shaped plate, a first chamfer on the lower surface of the pawl, and a second chamfer on one side of the ratchet.

[0007] Preferably, the surface of the L-shaped plate is provided with a clearance hole, and an electric telescopic rod is fixedly connected to the surface of the L-shaped plate. The output end of the electric telescopic rod is rotatably connected to one end of the sliding sleeve.

[0008] Furthermore, a first motor and a protective sleeve are fixedly connected to the upper surface of the mounting plate. The protective sleeve and the surface of the mounting plate are provided with through holes. The output end of the first motor is fixedly connected to the surface of the winding shaft. The surface of the winding shaft is rotatably connected to the inner wall of the protective sleeve.

[0009] Preferably, a steel rope is fixedly connected to the surface of the winding shaft, and a hook is fixedly connected to the bottom end of the steel rope, with the steel rope installed inside the through hole.

[0010] Furthermore, a second motor is fixedly connected to the upper surface of one of the cantilever frames, the output end of the second motor passes through the inner wall of the cantilever frame and is fixedly connected to a first bevel gear, and a lead screw is rotatably connected to the inner wall of one of the cantilever frames, the surface of the lead screw is fixedly connected to a second bevel gear, and the first bevel gear meshes with the second bevel gear.

[0011] Preferably, the inner wall of one of the slide plates is threaded to the surface of the lead screw, and multiple rollers are installed on the lower surface of each of the multiple support seats.

[0012] In summary, the technical effects and advantages of this utility model are as follows:

[0013] In this invention, when the hook hooks an object and is lifting, if the motor fails due to overload, the pawl limits the ratchet to prevent it from reversing, which in turn prevents the winding shaft from reversing, thus preventing the hook from falling and providing protection. When it is necessary to lower the hook, the electric telescopic rod is first activated, which pushes the sliding sleeve and ratchet to move as a whole. The ratchet disengages from the pawl, and the first motor drives its output end to reverse, thus lowering the hook. The advantage of this is that it prevents the hook from suddenly falling due to overload failure of the first motor, which could cause personal injury and property damage. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0016] Figure 2 This is a three-dimensional structural diagram of the lead screw in an embodiment of the present utility model;

[0017] Figure 3 This is a cross-sectional view of the protective sleeve in an embodiment of the present invention;

[0018] Figure 4 This is a three-dimensional structural diagram of the pawl in an embodiment of the present invention;

[0019] Figure 5 This is a three-dimensional structural diagram of the second chamfered angle in an embodiment of this utility model.

[0020] In the diagram: 1. Support base; 2. Cantilever frame; 3. Slide plate; 4. Roller; 5. Mounting plate; 6. First motor; 7. Protective sleeve; 8. Winding shaft; 9. Through hole; 10. Steel rope; 11. Hook; 12. L-shaped plate; 13. Electric telescopic rod; 14. Sliding sleeve; 15. Clearance hole; 16. Ratchet; 17. Return spring; 18. Pawl; 19. First chamfer; 20. Second chamfer; 21. Second motor; 22. First bevel gear; 23. Second bevel gear; 24. Lead screw. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example: Reference Figures 1-5 An adjustable combined jib crane is shown, including a pair of support seats 1. A cantilever frame 2 is fixedly connected to the surface of each pair of support seats 1. Multiple slide plates 3 are slidably connected to the surface of the cantilever frame 2. The same mounting plate 5 is fixedly connected to the surface of the multiple slide plates 3. A winding shaft 8 and an L-shaped plate 12 are installed above the mounting plate 5. A sliding sleeve 14 is slidably connected to the surface of the winding shaft 8. A support and protection mechanism is installed on the surface of the sliding sleeve 14.

[0023] The support and protection mechanism includes a ratchet 16 fixedly connected to the surface of the sliding sleeve 14, a return spring 17 fixedly connected to the surface of the L-shaped plate 12, a pawl 18 fixedly connected to the bottom end of the return spring 17, the inner wall of the pawl 18 being rotatably connected to the surface of the L-shaped plate 12, a first chamfer 19 being provided on the lower surface of the pawl 18, and a second chamfer 20 being provided on one side of the ratchet 16.

[0024] Using the above structure, by setting up the cantilever 2, multiple slide plates 3 are guided to slide and adjust their positions, changing the position of the mounting plate 5. By setting up the mounting plate 5, the support protective sleeve 7 and the first motor 6 are installed. By setting up the return spring 17, the return of the pawl 18 is kept stable. By setting up the pawl 18, the ratchet 16 is prevented from reversing and returning to its original position. When the ratchet 16 suddenly reverses, a limit protection is provided. By setting up the second chamfer 20 and the first chamfer 19, when the first chamfer 19 contacts the second chamfer 20, the pawl 18 is driven to be subjected to force and returns to its original position, cooperating with the ratchet 16 again.

[0025] Preferably, the surface of the L-shaped plate 12 is provided with a clearance hole 15, and an electric telescopic rod 13 is fixedly connected to the surface of the L-shaped plate 12. The output end of the electric telescopic rod 13 is rotatably connected to one end of the sliding sleeve 14.

[0026] By setting the clearance hole 15, space is provided for the ratchet 16 to move and avoid obstacles. By setting the electric telescopic rod 13, the position of the ratchet 16 is adjusted so that it disengages from the pawl 18.

[0027] Preferably, a first motor 6 and a protective sleeve 7 are fixedly connected to the upper surface of the mounting plate 5. The protective sleeve 7 and the surface of the mounting plate 5 are provided with through holes 9. The output end of the first motor 6 is fixedly connected to the surface of the winding shaft 8. The surface of the winding shaft 8 is rotatably connected to the inner wall of the protective sleeve 7.

[0028] The protective sleeve 7 is used to protect the winding shaft 8, and the through hole 9 is used to avoid the steel rope 10.

[0029] Preferably, a steel rope 10 is fixedly connected to the surface of the winding shaft 8, and a hook 11 is fixedly connected to the bottom end of the steel rope 10. The steel rope 10 is installed inside the through hole 9.

[0030] By setting up a hook 11, an object is lifted. By setting up a steel rope 10, when the winding shaft 8 rotates, the hook 11 is driven to change at high speed through the steel rope 10.

[0031] Preferably, a second motor 21 is fixedly connected to the upper surface of one of the cantilever frames 2, the output end of the second motor 21 passes through the inner wall of the cantilever frame 2 and is fixedly connected to a first bevel gear 22, and a lead screw 24 is rotatably connected to the inner wall of one of the cantilever frames 2, and a second bevel gear 23 is fixedly connected to the surface of the lead screw 24, and the first bevel gear 22 meshes with the second bevel gear 23.

[0032] By setting a second motor 21, the first bevel gear 22 is driven to rotate. By setting the first bevel gear 22, the second bevel gear 23 is driven to rotate. By setting a lead screw 24, the positions of the slide plate 3 and the mounting plate 5 are changed.

[0033] Preferably, the inner wall of one of the slide plates 3 is threaded to the surface of the lead screw 24, and multiple rollers 4 are installed on the lower surface of the multiple support seats 1.

[0034] By setting multiple rollers 4, it is convenient to move the entire position of a pair of support bases 1.

[0035] The working principle of this utility model is as follows: An adjustable combined jib crane starts by starting the second motor 21, which drives the second bevel gear 23 to rotate via the first bevel gear 22, thereby driving the lead screw 24 to rotate. The position of the mounting plate 5 is adjusted by the sliding plate 3. After the hook 11 hooks an object, the first motor 6 is started. The output end of the first motor 6 drives the winding shaft 8 to rotate. The rotation of the winding shaft 8 winds the steel rope 10 around the winding shaft 8, causing the hooked object to rise. The winding shaft 8 drives the sliding sleeve 14 and the ratchet 16 to rotate. At this time, the surface of the ratchet 16 contacts the surface of the pawl 18, causing the pawl 18 to rotate. To avoid overloading, the compression return spring 17 shortens. If the first motor 6 suddenly fails due to overload, the sliding sleeve 14 will cause the ratchet 16 to suddenly reverse. The pawl 18 will then engage with the ratchet 16 to maintain a limit position and provide safety protection. During normal use, when the hook 11 needs to be lowered, the electric telescopic rod 13 is activated to push the sliding sleeve 14 and the ratchet 16 to move as a whole, causing the ratchet 16 to disengage from the pawl 18. At this time, the first motor 6 is activated to reverse its output end. The pawl 18 will not interfere with the ratchet 16. Through the above structure, the sudden drop of the hook 11 due to overload failure of the first motor 6 will be prevented, thus avoiding personal injury and property damage.

[0036] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An adjustable combined jib crane, comprising a pair of support bases (1), characterized in that: A cantilever (2) is fixedly connected to the surface of each pair of support bases (1). Multiple slide plates (3) are slidably connected to the surface of the cantilever (2). The same mounting plate (5) is fixedly connected to the surface of the multiple slide plates (3). A winding shaft (8) and an L-shaped plate (12) are installed above the mounting plate (5). A sliding sleeve (14) is slidably connected to the surface of the winding shaft (8). A support and protection mechanism is installed on the surface of the sliding sleeve (14). The support and protection mechanism includes a ratchet (16) fixedly connected to the surface of the sliding sleeve (14), a return spring (17) fixedly connected to the surface of the L-shaped plate (12), a pawl (18) fixedly connected to the bottom end of the return spring (17), the inner wall of the pawl (18) being rotatably connected to the surface of the L-shaped plate (12), a first chamfer (19) being provided on the lower surface of the pawl (18), and a second chamfer (20) being provided on one side of the ratchet (16).

2. The adjustable combined jib crane according to claim 1, characterized in that: The L-shaped plate (12) has a clearance hole (15) on its surface, and an electric telescopic rod (13) is fixedly connected to the surface of the L-shaped plate (12). The output end of the electric telescopic rod (13) is rotatably connected to one end of the sliding sleeve (14).

3. An adjustable combined jib crane according to claim 1, characterized in that: The upper surface of the mounting plate (5) is fixedly connected to a first motor (6) and a protective sleeve (7). The protective sleeve (7) and the surface of the mounting plate (5) are provided with through holes (9). The output end of the first motor (6) is fixedly connected to the surface of the winding shaft (8). The surface of the winding shaft (8) is rotatably connected to the inner wall of the protective sleeve (7).

4. An adjustable combined jib crane according to claim 1, characterized in that: A steel rope (10) is fixedly connected to the surface of the winding shaft (8), and a hook (11) is fixedly connected to the bottom end of the steel rope (10). The steel rope (10) is installed inside the through hole (9).

5. An adjustable combined jib crane according to claim 1, characterized in that: A second motor (21) is fixedly connected to the upper surface of one of the cantilever frames (2). The output end of the second motor (21) passes through the inner wall of the cantilever frame (2) and is fixedly connected to a first bevel gear (22). A lead screw (24) is rotatably connected to the inner wall of one of the cantilever frames (2). A second bevel gear (23) is fixedly connected to the surface of the lead screw (24). The first bevel gear (22) meshes with the second bevel gear (23).

6. An adjustable combined jib crane according to claim 1, characterized in that: The inner wall of one of the slide plates (3) is threaded to the surface of the lead screw (24), and multiple rollers (4) are installed on the lower surface of each of the multiple support seats (1).

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