Variable-multiplying-power lifting hook device and using method thereof

Abstract

The invention provides a variable-magnification lifting hook device and a using method thereof.The variable-magnification lifting hook device comprises a fixed pulley block connected with an arm head, a lifting rope and a movable pulley block connected with the fixed pulley block through the lifting rope, a lifting hook is connected to the middle of the lower end of the movable pulley block, and the movable pulley block comprises a movable pulley frame; two ends of the movable pulley frame are respectively connected with a first movable pulley and a second movable pulley which are parallel, the middle of the upper end of the movable pulley frame is connected with a separable third movable pulley, and the lower end of the fixed pulley block is provided with a lifting rope fixing hole and a movable pulley fixing hole I and a movable pulley fixing hole II which are used for hanging the third movable pulley. By adjusting the installation position of the third movable pulley and the winding mode of the lifting rope, rapid switching of 2 / 3 / 4 multiplying power can be achieved, it is guaranteed that the multiplying power can be rapidly and accurately adjusted in the lifting process, various lifting requirements are met, and therefore the flexibility and efficiency of lifting operation are further improved.

Description

Technical Field

[0001] The present application relates to the technical field of brake systems, and in particular to an auxiliary brake system, a control method and a forklift. Background Art

[0002] A roof crane is a type of lifting equipment used specifically for construction sites. It is usually installed on the roof structure of a building and uses a winch and a retractable cantilever to achieve vertical lifting and horizontal movement of heavy objects. During lifting operations, in order to maximize lifting efficiency and ensure operational safety, the roof crane will flexibly adjust its lifting ratio according to the weight difference of the load it carries. When the load is light, a smaller ratio can save energy and increase the lifting speed; when the load is heavy, it switches to a larger ratio to enhance lifting capacity and stability.

[0003] However, the traditional hook-changing ratio method has limitations. It can usually only achieve the change between the double ratio and the quadruple ratio, but cannot quickly and easily switch to the triple ratio. This limitation affects the flexibility and efficiency of the roof crane in the lifting operation to a certain extent, especially in the scene where the lifting weight needs to be adjusted frequently. Summary of the invention

[0004] In order to solve the technical problems existing in the prior art, the first aspect of the present application provides a variable-ratio hook device, comprising a fixed pulley group connected to the arm head, a lifting rope, and a movable pulley group connected to the fixed pulley group through the lifting rope, a lifting hook is connected to the middle of the lower end of the movable pulley group, the movable pulley group comprises a movable pulley frame, the two ends of the movable pulley frame are respectively connected to a first movable pulley and a second movable pulley in parallel, a detachable third movable pulley is connected to the middle of the upper end of the movable pulley frame, and the lower end of the fixed pulley group is provided with a lifting rope fixing hole and movable pulley fixing holes I and II for hanging the third movable pulley.

[0005] Furthermore, the fixed pulley block includes a fixed pulley frame, which is a double-layer box-type structure, including two oppositely arranged first fixed plates, the top ends of which are fixedly connected to the arm head through a cantilever connecting frame, and a plurality of guide pulleys are connected between the two first fixed plates.

[0006] Furthermore, a V-shaped groove is provided in the middle of the upper end of the movable pulley frame, and a first axial hole is provided below the V-shaped groove; the third movable pulley comprises a pulley body and a pulley bracket, a V-shaped protrusion corresponding to the V-shaped groove is provided on the inner side of the pulley bracket, and a second axial hole corresponding to the first axial hole is provided at the lower end of the pulley bracket; when the third movable pulley is installed on the movable pulley frame, the first axial hole and the second axial hole are connected by a pin shaft so that the third movable pulley is fixedly connected to the movable pulley frame.

[0007] Furthermore, the third movable pulley also includes a first connecting frame hinged to the pulley bracket, and an end of the first connecting frame away from the pulley bracket is provided with a reaming hole hinged to the movable pulley fixing hole I or the movable pulley fixing hole II.

[0008] Furthermore, the variable-magnification hook device also includes a rope fixing device, which includes a second connecting frame and a rope winding frame hinged to each other, a locking assembly is provided at the bottom of the rope winding frame, and the second connecting frame is provided with a hinged hole at one end away from the rope winding frame for hinged connection with the rope fixing hole or the first shaft hole.

[0009] Furthermore, the first fixing plate is a missing-corner triangle structure, the suspension rope fixing hole is arranged on the left side of the lower end of the first fixing plate, the movable pulley fixing hole II is arranged in the middle of the lower end of the first fixing plate, and the movable pulley fixing hole I is arranged between the suspension rope fixing hole and the movable pulley fixing hole II.

[0010] Furthermore, a notch is provided on the left side of the lower end of the first fixing plate, and the hanging rope fixing hole is provided above the notch.

[0011] Furthermore, the plurality of guide pulleys include a first guide pulley and a second guide pulley which are arranged on the right side of the first fixing plate.

[0012] A second aspect of the present application provides a method for using a variable-rate hook device as described in any one of the above items, the method comprising: When the double ratio is used, the third movable pulley is fixed to the movable pulley frame, and the suspension rope passes through the fixed pulley block and is sequentially wound around the first movable pulley, the third movable pulley and the second movable pulley, and finally fixed to the fixed pulley block through the suspension rope fixing device; When the triple ratio is used, the third movable pulley is fixed to the movable pulley fixing hole I of the fixed pulley block, and the suspension rope passes through the fixed pulley block and is wound around the first movable pulley, the second movable pulley and the third movable pulley in sequence, and is finally fixed to the movable pulley frame through the suspension rope fixing device; When the quadruple rate is used, the third movable pulley is fixed to the movable pulley fixing hole II of the fixed pulley block, and after the suspension rope passes through the fixed pulley block, it is wound around the first movable pulley, the third movable pulley and the second movable pulley in sequence, and finally fixed to the fixed pulley block through the suspension rope fixing device.

[0013] Compared with the prior art, the beneficial effects of this application are: The variable ratio hook device of the present application is provided with a detachable third movable pulley in the movable pulley group. By adjusting the installation position of the third movable pulley and the winding method of the lifting rope, rapid switching of 2 / 3 / 4 ratios can be achieved to ensure that the ratio can be adjusted quickly and accurately during the lifting process to meet various lifting needs, thereby further improving the flexibility and efficiency of the lifting operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the variable-rate hook device of the present application in a double-rate state; Figure 2 It is a schematic diagram of the structure of the variable-rate hook device of the present application in three-rate states; Figure 3 It is a schematic diagram of the structure of the variable-rate hook device of the present application in four-rate states; Figure 4 It is a structural schematic diagram of the fixed pulley block of the present application; Figure 5 It is a structural schematic diagram of the movable pulley block of the present application; Figure 6 is a schematic structural diagram of the third movable pulley of the present application; Figure 7 It is a structural schematic diagram of the hanging rope fixing device of the present application; Description of reference numerals: 1. Arm head; 2. Fixed pulley block; 21. Rope fixing hole; 22. Movable pulley fixing hole I; 23. Movable pulley fixing hole II; 24. First fixing plate; 25. First guide pulley; 26. Second guide pulley; 3. Movable pulley block; 31. Movable pulley frame; 311. V-shaped groove; 312. First axial hole; 32. First movable pulley; 33. Second movable pulley; 34. Third movable pulley; 341. Pulley body; 342. Pulley bracket; 343. V-shaped protrusion; 344. Second axial hole; 345. First connecting frame; 4. Rope; 5. Hook; 6. Rope fixing device; 61. Second connecting frame; 62. Rope-wrapping frame; 63. Locking assembly; 7. Cantilever connecting frame. DETAILED DESCRIPTION

[0015] In order to facilitate the understanding of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0016] refer to Figures 1 to 3As shown, a variable ratio hook device provided in this embodiment is connected below the boom head of the roof crane, and the variable ratio hook device comprises a fixed pulley block 2 connected to the boom head 1, a suspension rope 4, and a movable pulley block 3 connected to the fixed pulley block 2 through the suspension rope 4, a suspension hook 5 is connected to the middle of the lower end of the movable pulley block 3, and the movable pulley block 3 comprises a movable pulley frame 31, and the two ends of the movable pulley frame 31 are respectively connected to a first movable pulley 32 and a second movable pulley 33 in parallel, and a detachable third movable pulley 34 is connected to the middle of the upper end of the movable pulley frame 31, and the lower end of the fixed pulley block 2 is provided with a suspension rope fixing hole 21 and a movable pulley fixing hole Ⅰ22 and a movable pulley fixing hole Ⅱ23 for hanging the third movable pulley 34. By adjusting the installation position of the third movable pulley 34 and the winding method of the suspension rope 4, a rapid switching of 2 / 3 / 4 ratios can be achieved, so as to ensure that the ratio can be adjusted quickly and accurately during the hoisting process, meet various hoisting requirements, and further improve the flexibility and efficiency of the hoisting operation.

[0017] Specifically, refer to Figure 4 As shown, the fixed pulley block 2 includes a fixed pulley frame, which is a double-layer plate box-type structure, including two first fixed plates 24 arranged opposite to each other, and the two first fixed plates 24 are fixedly connected by a bracket. The top of the first fixed plate 24 is connected to the lower end of the cantilever connecting frame 7 through a pin, and the upper end of the cantilever connecting frame 7 is connected to the arm head 1 through a pin. A plurality of guide pulleys are connected between the two first fixed plates 24; one end of the suspension rope 4 passes through the plurality of guide pulleys and is connected to the winch of the roof crane; the other end of the suspension rope 4 passes through the movable pulley block 3 and is connected to the fixed pulley block 2 or the movable pulley block 3, and the vertical lifting or lowering of the heavy object is realized under the drive of the winch.

[0018] Secondly, the first fixed plate 24 is a missing-corner triangle structure, and the multiple guide pulleys include a first guide pulley 25 and a second guide pulley 26 arranged on the right side of the first fixed plate 24; the rope fixing hole 21 is arranged on the left side of the lower end of the first fixed plate 24, the movable pulley fixing hole II 23 is arranged in the middle of the lower end of the first fixed plate 24, and the movable pulley fixing hole I 22 is arranged between the rope fixing hole 21 and the movable pulley fixing hole II 23.

[0019] In some embodiments, reference Figure 5 , Figure 6As shown, a V-shaped groove 311 is provided in the middle of the top of the movable pulley frame 31, and a first shaft hole 312 is provided below the V-shaped groove 311; the third movable pulley 34 includes a pulley body 341 and a pulley bracket 342, and the pulley bracket 342 includes two relative second fixing plates, and the inner sides of the two second fixing plates are provided with a V-shaped protrusion 343 corresponding to the V-shaped groove 311, and the bottom end of the second fixing plate is provided with a second shaft hole 344 corresponding to the first shaft hole 312. When the double ratio is used, the third movable pulley 34 is installed on the movable pulley frame 31, and the two second fixing plates are respectively engaged on both sides of the movable pulley frame 31, and the V-shaped protrusion 343 on the inner side of the second fixing plate is engaged in the V-shaped groove 311 on the top of the movable pulley frame 31, and the first shaft hole 312 and the second shaft hole 344 are connected by a pin shaft so that the third movable pulley 34 is fixedly connected to the movable pulley frame 31. The third movable pulley 34 can be prevented from moving during the lifting process, thereby improving the stability and safety of the variable ratio hook device.

[0020] In some embodiments, the third movable pulley 34 further comprises a first connecting frame 345 hinged to the pulley bracket 342, and one end of the first connecting frame 345 away from the pulley bracket 342 is provided with a reaming hole hinged to the movable pulley fixing hole I22 or the movable pulley fixing hole II23. When the triple ratio is used, the reaming hole on the first connecting frame 345 is connected to the movable pulley fixing hole I22 through a pin shaft, and the third movable pulley 34 is fixed at the movable pulley fixing hole I22. When the quadruple ratio is used, the reaming hole on the first connecting frame 345 is connected to the movable pulley fixing hole II23 through a pin shaft, and the third movable pulley 34 is fixed at the movable pulley fixing hole II23.

[0021] In some embodiments, reference Figure 7 As shown, the variable ratio hook device also includes a rope fixing device 6, which includes a second connecting frame 61 and a rope reel frame 62 that are hinged to each other, and a locking assembly 63 is provided at the bottom of the rope reel frame 62. The locking assembly 63 includes a locking nut and a locking bolt, and a slot is provided on the inner side of the locking nut. The end of the rope 4 away from the winch is wound around the rope reel frame 62, and its end is wound in the slot of the locking nut. The locking bolt is screwed to achieve a fixed connection between the rope 4 and the rope fixing device 6. The end of the second connecting frame 61 away from the rope reel frame 62 is provided with a reaming hole for hinged connection with the rope fixing hole 21 or the first shaft hole 312. When the double ratio or quadruple ratio is used, the reaming hole on the second connecting frame 61 is connected to the rope fixing hole 21 on the fixed pulley block 2 through a pin shaft, so that the rope 4 is fixed to the fixed pulley block 2. When the triple ratio is used, the reaming hole on the second connecting frame 61 is connected to the first shaft hole 312 on the movable pulley block 3 through the pin shaft, so that the lifting rope 4 is fixed to the movable pulley block 3. After the lifting rope 4 is fixedly connected to the lifting rope fixing device 6, it is only necessary to connect the lifting rope fixing device 6 to the fixed pulley block 2 or the movable pulley block 3 through the pin shaft, which is convenient for installation and disassembly, and greatly improves the working efficiency of the variable ratio hook device In some embodiments, reference Figure 4 As shown, a notch is provided on the left side of the lower end of the first fixing plate 24, and the rope fixing hole 21 is provided above the notch. When the rope 4 is fixed to the first fixing plate 24 through the rope fixing device 6, the notch on the first fixing plate 24 can limit the rope fixing device 6, preventing it from contacting the third movable pulley 34 installed at the movable pulley fixing hole II 23 when swinging left and right, causing a potential safety hazard caused by the rope 4 being tangled and disordered.

[0022] refer to Figures 2 to 3 As shown, this embodiment also discloses a method for using the variable-rate hook device as described above, characterized in that the method comprises: When the double rate is used, the third movable pulley 34 is fixed to the movable pulley frame 31, and the suspension rope 4 passes through the fixed pulley block 2, and then is wound around the first movable pulley 32, the third movable pulley 34, and the second movable pulley 33 in sequence, and finally fixed to the fixed pulley block 2 through the suspension rope fixing device 6; When the triple ratio is used, the third movable pulley 34 is fixed to the movable pulley fixing hole Ⅰ22 of the fixed pulley block 2. After the suspension rope 4 passes through the fixed pulley block 2, it is wound around the first movable pulley 32, the second movable pulley 33 and the third movable pulley 34 in sequence, and finally fixed to the movable pulley frame 31 through the suspension rope fixing device 6; When the quadruple rate is used, the third movable pulley 34 is fixed to the movable pulley fixing hole II 23 of the fixed pulley block 2. After the sling rope 4 passes through the fixed pulley block 2, it is wound around the first movable pulley 32, the third movable pulley 34 and the second movable pulley 33 in sequence, and finally fixed to the fixed pulley block 2 through the sling rope fixing device 6.

[0023] Specifically, when the double rate is used, the third movable pulley 34 is installed on the movable pulley frame 31, and the two second fixing plates are respectively engaged with the two sides of the movable pulley frame 31, and the V-shaped protrusion 343 on the inner side of the second fixing plate is engaged with the V-shaped groove 311 on the top of the movable pulley frame 31, and the first shaft hole 312 and the second shaft hole 344 are connected by a pin shaft so that the third movable pulley 34 is fixedly connected to the movable pulley frame 31. Under the guidance of the first guide pulley 25 and the second guide pulley 26, the suspension rope 4 passes through the right side of the fixed pulley block 2, and is wound around the first movable pulley 32, the third movable pulley 34 and the second movable pulley 33 in sequence, and is finally fixed to the suspension rope fixing hole 21 on the left side of the fixed pulley block 2 through the suspension rope fixing device 6.

[0024] When the triple ratio is used, the reaming hole on the first connecting frame 345 of the third movable pulley 34 is connected to the movable pulley fixing hole Ⅰ22 through a pin shaft, and the third movable pulley 34 is fixed to the movable pulley fixing hole Ⅰ22 of the fixed pulley block 2. Under the guidance of the first guide pulley 25 and the second guide pulley 26, the suspension rope 4 passes through the right side of the fixed pulley block 2, and is wound around the first movable pulley 32, the second movable pulley 33 and the third movable pulley 34 in sequence, and is finally fixed to the first shaft hole 312 of the movable pulley block 3 through the suspension rope fixing device 6.

[0025] When the quadruple ratio is used, the reaming hole on the first connecting frame 345 of the third movable pulley 34 is connected to the movable pulley fixing hole II23 through a pin shaft, and the third movable pulley 34 is fixed to the movable pulley fixing hole II23 in the middle of the lower end of the fixed pulley block 2. Under the guidance of the first guide pulley 25 and the second guide pulley 26, the suspension rope 4 passes through the right side of the fixed pulley block 2, and is wound around the first movable pulley 32, the third movable pulley 34 and the second movable pulley 33 in sequence, and is finally fixed to the suspension rope fixing hole 21 on the left side of the fixed pulley block 2 through the suspension rope fixing device 6.

[0026] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present application. Without departing from the spirit and scope of the present application, the present application may have various changes and improvements, which fall within the scope of the present application to be protected. The scope of protection claimed in the present application is defined by the attached claims and their equivalents.

Claims

1. A variable-rate hook device, comprising a fixed pulley block (2) connected to a boom head (1), a lifting rope (4), and a movable pulley block (3) connected to the fixed pulley block (2) via the lifting rope (4), wherein a lifting hook (5) is connected to the middle of the lower end of the movable pulley block (3), characterized in that: The movable pulley block (3) comprises a movable pulley frame (31), the two ends of the movable pulley frame (31) are respectively connected to a first movable pulley (32) and a second movable pulley (33) arranged in parallel, the middle of the upper end of the movable pulley frame (31) is connected to a detachable third movable pulley (34), and the lower end of the fixed pulley block (2) is provided with a suspension rope fixing hole (21) and a movable pulley fixing hole I (22) and a movable pulley fixing hole II (23) for hanging the third movable pulley (34).

2. The variable-rate hook device according to claim 1, characterized in that: The fixed pulley block (2) comprises a fixed pulley frame, which is a double-layer plate box-type structure and comprises two first fixed plates (24) arranged opposite to each other, the top ends of which are fixedly connected to the arm head (1) via a cantilever connecting frame (7), and a plurality of guide pulleys are connected between the two first fixed plates (24).

3. The variable-rate hook device according to claim 1, characterized in that: A V-shaped groove (311) is provided in the middle of the upper end of the movable pulley frame (31), and a first shaft hole (312) is provided below the V-shaped groove (311); the third movable pulley (34) comprises a pulley body (341) and a pulley bracket (342), the inner side of the pulley bracket (342) is provided with a V-shaped protrusion (343) corresponding to the V-shaped groove (311), and the lower end of the pulley bracket (342) is provided with a second shaft hole (344) corresponding to the first shaft hole (312); when the third movable pulley (34) is mounted on the movable pulley frame (31), the first shaft hole (312) and the second shaft hole (344) are connected by a pin shaft so that the third movable pulley (34) and the movable pulley frame (31) are fixedly connected.

4. The variable-rate hook device according to claim 3, characterized in that: The third movable pulley (34) further comprises a first connecting frame (345) hinged to the pulley bracket (342); an end of the first connecting frame (345) away from the pulley bracket (342) is provided with a reaming hole hinged to the movable pulley fixing hole I (22) or the movable pulley fixing hole II (23).

5. The variable-rate hook device according to claim 1, characterized in that: The variable-rate hook device also includes a rope fixing device (6), which includes a second connecting frame (61) and a rope winding frame (62) hinged to each other, a locking assembly (63) is provided at the bottom of the rope winding frame (62), and a reaming hole for hinged connection with the rope fixing hole (21) or the first shaft hole (312) is provided at one end of the second connecting frame (61) away from the rope winding frame (62).

6. The variable-rate hook device according to claim 2, characterized in that: The first fixing plate (24) is a missing-corner triangle structure, the hanging rope fixing hole (21) is arranged on the left side of the lower end of the first fixing plate (24), the movable pulley fixing hole II (23) is arranged in the middle of the lower end of the first fixing plate (24), and the movable pulley fixing hole I (22) is arranged between the hanging rope fixing hole (21) and the movable pulley fixing hole II (23).

7. The variable-rate hook device according to claim 6, characterized in that: A notch is provided on the left side of the lower end of the first fixing plate (24), and the suspension rope fixing hole (21) is provided above the notch.

8. The variable-rate hook device according to claim 6, characterized in that: The plurality of guide pulleys include a first guide pulley (25) and a second guide pulley (26) which are arranged on the right side of the first fixing plate (24).

9. A method for using the variable-rate hook device according to any one of claims 1 to 8, characterized in that: The method includes: When the double ratio is used, the third movable pulley (34) is fixed to the movable pulley frame (31), and the suspension rope (4) passes through the fixed pulley block (2), is wound around the first movable pulley (32), the third movable pulley (34) and the second movable pulley (33) in sequence, and is finally fixed to the fixed pulley block (2) through the suspension rope fixing device (6); When the triple ratio is used, the third movable pulley (34) is fixed to the movable pulley fixing hole I (22) of the fixed pulley block (2), and the suspension rope (4) passes through the fixed pulley block (2), is wound around the first movable pulley (32), the second movable pulley (33) and the third movable pulley (34) in sequence, and is finally fixed to the movable pulley frame (31) through the suspension rope fixing device (6); When the quadruple ratio is used, the third movable pulley (34) is fixed to the movable pulley fixing hole II (23) of the fixed pulley block (2), and the suspension rope (4) passes through the fixed pulley block (2) and is sequentially wound around the first movable pulley (32), the third movable pulley (34) and the second movable pulley (33), and is finally fixed to the fixed pulley block (2) through the suspension rope fixing device (6).

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