Hook multiplying power switching device for small and medium-sized luffing jib tower crane

Abstract

The utility model provides a lifting hook multiplying power switching device of a small and medium-sized movable arm tower crane, which belongs to the technical field of lifting hook multiplying power switching and comprises an arm support, a steel wire rope and a lifting hook, the arm support is connected with the lifting hook through the steel wire rope, the lifting hook comprises a main hook and an auxiliary hook, the auxiliary hook is arranged at the upper end of the main hook and is detachably arranged with the main hook, and the auxiliary hook is detachably connected with the arm support. After the auxiliary hook and the arm support are detached, the auxiliary hook is connected with the arm support through a steel wire rope and connected with the main hook. On the premise that the steel wire rope is not disassembled and wound again, four / three / two multiplying power rope penetrating mode switching of the lifting hook of the movable arm tower crane is completed, and the project construction progress is not affected while the lifting performance of the movable arm tower crane is fully exerted.

Description

Technical Field

[0001] This utility model relates to the field of construction hoisting machinery technology, and in particular to a hook ratio switching device for small and medium-sized luffing tower cranes. Background Technology

[0002] To fully utilize the lifting performance of small and medium-sized luffing tower cranes, a four-fold rope threading method is adopted in the initial stage of tower crane use. When the tower crane is raised to a height where the wire rope can no longer meet the requirements of the four-fold rope threading method, the wire rope is disassembled and re-threaded to switch to the three-fold rope threading method. Similarly, when the tower crane is raised to a height where the wire rope can no longer meet the requirements of the three-fold rope threading method, the wire rope is disassembled and re-threaded to switch to the two-fold rope threading method.

[0003] For the 2x and 4x rope threading methods, the end of the wire rope is fixed to the end of the boom; for the 3x rope threading method, the end of the wire rope is fixed to the hook. During construction, as the tower crane rises, and the 4x / 3x / 2x rope threading methods are used sequentially, each switch requires disassembling and re-threading the wire rope, reducing construction efficiency.

[0004] Current technology allows for switching between 4x and 2x rope threading methods without disassembling the wire rope by fixing the auxiliary hook to the end of the boom. However, switching between 4x / 3x and 3x / 2x rope threading methods requires disassembly and re-threading of the wire rope due to the different fixing positions at the ends. To avoid impacting project progress, construction companies often choose to switch the rope threading method directly from 4x to 2x without disassembling the wire rope. This method ensures construction efficiency but sacrifices some of the tower crane's lifting performance. Utility Model Content

[0005] The purpose of this invention is to provide a hook ratio switching device for small and medium-sized luffing tower cranes, solving the technical problem that existing crane hook rope ratio switching between four / three and three / two ratios requires disassembling and rewinding the wire rope. This invention enables the switching of the luffing tower crane hook between four / three and three / two ratios without disassembling and rewinding the wire rope.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A hook ratio switching device for a small to medium-sized luffing tower crane includes a boom, a wire rope, and a hook. The boom is connected to the hook via the wire rope. The hook includes a main hook and an auxiliary hook. The auxiliary hook is located at the upper end of the main hook and is detachably connected to the main hook. The auxiliary hook is detachably connected to the boom. After the auxiliary hook is detached from the boom, it is connected to the boom via the wire rope, and at the same time, it is connected to the main hook.

[0008] Furthermore, a pin hole is provided at the bottom of the auxiliary hook, through which the pin can be detachably connected to the main hook.

[0009] Furthermore, stops are provided on both sides of the secondary hook, and a 2x and a 3x connection hole are provided at the upper end of the secondary hook. The 2x connection hole is located in the middle position, and the 3x connection hole is located to the right of the 2x connection hole. A wedge sleeve fixing block is provided on the secondary hook.

[0010] Furthermore, a switching pin is provided at the top of the auxiliary hook, which is detachably connected to the boom.

[0011] Furthermore, the boom includes a boom end, a rope delivery pulley, a pulley frame, and a connecting device. The rope delivery pulley, pulley frame, and connecting device are all located at the bottom of the boom end, which is configured as a triangular structure.

[0012] Furthermore, the connecting device includes a venting device, a secondary hook fixing hole, a connecting plate, and a wedge sleeve. The secondary hook fixing hole is located at the lower right corner of the pulley frame, the venting device is located at the bottom of the boom end, the connecting plate is located at the bottom of the venting device, and the wedge sleeve is located at the bottom of the connecting plate.

[0013] This utility model, by adopting the above-mentioned technical solution, has the following beneficial effects:

[0014] This invention allows for the switching of the luffing jib tower crane hook rope ratio between four / three / two without disassembling or rewinding the wire rope, thus maximizing the lifting performance of the luffing jib tower crane without affecting the project's construction progress. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the switching device of this utility model;

[0016] Figure 2 This is a schematic diagram of the overall structure of the hook of this utility model;

[0017] Figure 3 This is a schematic diagram of the boom end structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the four-magnification switching to two-magnification structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the four-magnification switching to three-magnification structure of this utility model.

[0020] In the attached diagram, 1-boom, 2-wire rope, 3-hook, 4-main hook, 5-secondary hook, 6-pin, 7-stop block, 8-wedge sleeve fixing block, 9-double ratio connection hole, 10-triple ratio connection hole, 11-switching pin, 12-boom end, 13-venting device, 14-rope exit pulley, 15-pulley bracket, 16-secondary hook fixing hole, 17-connecting plate, 18-wedge sleeve, 19-insertion switching pin, 20-removal pin. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are merely to provide the reader with a thorough understanding of one or more aspects of this utility model, and these aspects can be achieved even without these specific details.

[0022] like Figure 1 As shown, a hook ratio switching device for a small to medium-sized luffing tower crane includes a boom 1, a wire rope 2, and a hook 3. The boom 1 is connected to the hook 3 via the wire rope 2. The hook 3 includes a main hook 4 and an auxiliary hook 5. The auxiliary hook 5 is located above the main hook 4 and is detachably connected to the main hook 4. The auxiliary hook 5 is detachably connected to the boom 1. After the auxiliary hook 5 is detached from the boom 1, it is connected to the boom 1 via the wire rope 2, and simultaneously connected to the main hook 4. The wire rope exits from the rope exit pulley, passes sequentially through the main hook pulley, the pulley frame pulley, and the auxiliary hook pulley, and is fixed at the end to a wedge sleeve. This rope threading method is a four-fold rope threading.

[0023] When the auxiliary hook 5 is connected to the boom 1, and the boom 1 is connected to the hook 3 via the wire rope 2, it is in the state of switching from a four-fold to a two-fold ratio. When the auxiliary hook 5 is connected to the main hook 4, and both the main hook 4 and the auxiliary hook 5 are connected to the boom 1 via the wire rope 2, it is in the state of switching from a four-fold to a three-fold ratio.

[0024] In this embodiment of the utility model, such as Figure 2As shown, the auxiliary hook 5 has a pin hole at its bottom, through which a pin 6 is detachably connected to the main hook 4. Stops 7 are provided on both sides of the auxiliary hook 5. A 2x magnification connection hole 9 and a 3x magnification connection hole 10 are provided at the top of the auxiliary hook 5. The 2x magnification connection hole 9 is located in the middle, and the 3x magnification connection hole 10 is located to the right of the 2x magnification connection hole 9. A wedge-shaped fixing block 8 is provided on the auxiliary hook 5. A switching pin 11 is provided at the top of the auxiliary hook 5, allowing for detachable connection to the boom 1. The lower part of the auxiliary hook is connected to the main hook with a pin; there are stops at the lower left and lower right positions of the auxiliary hook to control the limit angle of the auxiliary hook relative to the main hook; a switching pin is fixed to the upper part of the auxiliary hook with an iron chain; there are two connecting holes drilled on the upper part of the auxiliary hook, the middle one is a double-rate connecting hole and the right one is a triple-rate connecting hole. By passing the switching pin through different connecting holes, the double-rate and triple-rate rope threading methods of the hook can be switched; a wedge sleeve fixing block is welded to the inner side of the upper right part of the auxiliary hook, which is used to fix the wedge sleeve at the end of the wire rope when the hook is threaded in triple-rate mode.

[0025] In this embodiment of the utility model, such as Figure 3 As shown, the boom 1 includes a boom end 12, a rope delivery pulley 14, a pulley frame 15, and a connecting device. The rope delivery pulley 14, pulley frame 15, and connecting device are all located at the bottom of the boom end 12, which has a triangular structure. The connecting device includes a venting device 13, a secondary hook fixing hole 16, a connecting plate 17, and a wedge sleeve 18. The secondary hook fixing hole 16 is located at the lower right corner of the pulley frame 15. The venting device 13 is located at the bottom of the boom end 12, the connecting plate 17 is located at the bottom of the venting device 13, and the wedge sleeve 18 is located at the bottom of the connecting plate 17. The boom end has a pulley frame, a venting device, and a rope delivery pulley. The lower right part of the pulley frame has a secondary hook fixing hole for fixing the secondary hook when using the double-ratio rope threading method. The lower part of the venting device is connected to two connecting plates with pins in sequence for loosening the end of the wire rope when switching to the triple-ratio rope threading method. A wedge sleeve is connected below the connecting plate to fix the end of the wire rope.

[0026] 1. For example Figure 4 As shown, in the four-fold rope threading mode, when the hook is raised to the point where the two-fold connection hole coincides with the auxiliary hook fixing hole on the pulley frame, this is the two-fold switching position. Pass the switching pin through the two holes, fix the auxiliary hook on the end of the boom, remove the connecting pin between the main hook and the auxiliary hook, lower the hook, and complete the switch from four-fold rope threading to two-fold rope threading.

[0027] 2. For example Figure 5As shown, in the four-fold rope threading mode, after raising the hook to the two-fold switching position, continue raising it until the end wedge sleeve of the wire rope is completely locked in the wedge sleeve fixing block of the auxiliary hook. At this time, continue raising the hook. Because the end wedge sleeve of the wire rope is locked on the auxiliary hook, the wire rope tension originally borne by the venting device is gradually transferred to the auxiliary hook. At the same time, the auxiliary hook tilts to the right under the action of the wire rope tension. When the auxiliary hook tilts to the limit position, this is the three-fold switching position. The venting device no longer bears the wire rope tension, and the two connecting plates are in a relaxed state. Remove the pin between the connecting plates, align the connecting hole of the lower connecting plate with the three-fold connecting hole on the auxiliary hook, insert the switching pin into the two holes, and lower the hook to complete the switch from four-fold rope threading to three-fold rope threading.

[0028] 3. Under the triple-ratio rope threading method, according to Figure 5 Reverse the steps shown, switch the rope threading method to 4x magnification, and then press... Figure 4 The steps shown switch to 2x magnification, and after completing the 3x magnification rope threading, switch back to 2x magnification rope threading.

[0029] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A hook ratio switching device for a small to medium-sized boom tower crane, characterized by: The utility model provides a crane, including arm support (1), wire rope (2) and lifting hook (3), arm support (1) is connected with lifting hook (3) through wire rope (2), lifting hook (3) includes main hook (4) and vice hook (5), vice hook (5) is arranged at the upper end of main hook (4), and vice hook (5) is detachably arranged with main hook (4), vice hook (5) is detachably connected with arm support (1), after vice hook (5) is detached with arm support (1), vice hook (5) is connected with arm support (1) through wire rope (2), and vice hook (5) is connected with main hook (4) simultaneously.

2. A hook ratio switching device for a small to medium-sized luffing tower crane according to claim 1, characterized in that: Vice hook (5) bottom is provided with pin hole, sets up pin (6) and is detachably connected with main hook (4) through pin hole.

3. A hook ratio switching device for a small to medium-sized luffing tower crane according to claim 2, characterized in that: The both sides of vice hook (5) are provided with stopper (7), the upper end of vice hook (5) is provided with two times ratio connecting hole (9) and three times ratio connecting hole (10), two times ratio connecting hole (9) is arranged in the middle position, three times ratio connecting hole (10) is arranged in the right of two times ratio connecting hole (9), and vice hook (5) is provided with wedge sleeve fixing block (8).

4. A hook ratio switching device for a small to medium-sized luffing tower crane according to claim 3, characterized in that: The top end of vice hook (5) is provided with switching pin (11), and vice hook (5) is detachably connected with arm support (1) through switching pin (11).

5. A hook ratio switching device for a small to medium sized luffing tower crane according to claim 4, characterized in that: Arm support (1) includes arm support end (12), rope exit pulley (14), pulley frame (15) and connecting device, and rope exit pulley (14), pulley frame (15) and connecting device are all arranged at the bottom of arm support end (12), and arm support end (12) is provided as a triangular structure.

6. A hook ratio switching device for a small to medium-sized luffing tower crane according to claim 5, characterized in that: The connecting device includes air release device (13), vice hook fixing hole (16), connecting plate (17) and wedge sleeve (18), vice hook fixing hole (16) is arranged at the right lower corner position of pulley frame (15), air release device (13) is arranged at the bottom of arm support end (12), connecting plate (17) is arranged at the bottom of air release device (13), and wedge sleeve (18) is arranged at the bottom of connecting plate (17).

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