Hook multiplying power switching system of small and medium-sized luffing jib tower crane

Abstract

The invention provides a lifting hook multiplying power switching system of a small and medium-sized movable arm tower crane, and belongs to the technical field of lifting hook multiplying power switching, the lifting hook multiplying power switching system 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 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] The invention relates to the technical field of building hoisting machinery, and in particular to a hook ratio switching system for small and medium-sized movable arm tower cranes. Background Art

[0002] In order to give full play to the hoisting performance of small and medium-sized luffing tower cranes, a four-fold rope threading method is adopted in the initial use of the tower crane. When the tower crane is lifted to a point where the wire rope can no longer meet the four-fold rope threading method, the wire rope is removed and re-threaded, and the three-fold rope threading method is switched. Similarly, when the tower crane is lifted to a point where the wire rope can no longer meet the three-fold rope threading method, the wire rope is removed and re-threaded, and the two-fold rope threading method is switched.

[0003] For the two- and four-times-rate threading methods, the end of the wire rope is fixed to the end of the boom, and for the three-times-rate threading method, the end of the wire rope is fixed to the hook. During the construction process, as the tower crane rises, the four- / three- / two-times-rate threading methods are used in sequence. Each time the threading method is switched, the wire rope needs to be disassembled and rewound, which reduces the construction efficiency.

[0004] Under current technology, the auxiliary hook is fixed to the end of the boom, which can realize the switch between the four-times and two-times threading mode without removing the wire rope. However, for the switch between the four-times and three-times threading modes, due to the different fixed positions of the wire rope end, the wire rope must be removed and rewound to achieve. In order not to affect the project construction progress, the construction unit will choose to switch the threading mode from four-times to two-times without removing the wire rope. This method ensures construction efficiency, but it will sacrifice part of the tower crane's hoisting performance. Summary of the invention

[0005] The purpose of the present invention is to provide a small and medium-sized boom tower crane hook ratio switching system to solve the technical problem that the existing crane hook needs to dismantle and rewind the wire rope when switching between the four-times / three-times and three-times / two-times threading mode. It can achieve the switching between the four-times / three-times and three-times / two-times threading mode of the boom tower crane hook without dismantling and rewinding the wire rope.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A hook ratio switching system for a small and medium-sized boom tower crane comprises a boom, a wire rope and a hook, wherein the boom is connected to the hook via a wire rope, the 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, the auxiliary hook is detachably connected to the boom, after the auxiliary hook is detached from the boom, the auxiliary hook is connected to the boom via a wire rope, and the auxiliary hook is connected to the main hook at the same time;

[0008] When the auxiliary hook is connected to the boom, and the boom is connected to the hook through a wire rope, it is in a state of switching from a four-fold rate to a two-fold rate. When the auxiliary hook is connected to the main hook, and both the main hook and the auxiliary hook are connected to the boom through a wire rope, it is in a state of switching from a four-fold rate to a three-fold rate.

[0009] Furthermore, a pin hole is provided at the bottom of the auxiliary hook, and a pin is provided to be detachably connected to the main hook through the pin hole.

[0010] Furthermore, blocks are provided on both sides of the auxiliary hook, a double-rate connection hole and a triple-rate connection hole are provided on the upper end of the auxiliary hook, the double-rate connection hole is provided in the middle position, the triple-rate connection hole is provided on the right side of the double-rate connection hole, and a wedge sleeve fixing block is provided on the auxiliary hook.

[0011] Furthermore, a switching pin is provided at the top end of the auxiliary hook, which is detachably connected to the arm bracket via the switching pin.

[0012] Furthermore, the boom includes a boom end, a rope output pulley, a pulley frame and a connecting device. The rope output pulley, the pulley frame and the connecting device are all arranged at the bottom of the boom end, and the boom end is arranged as a triangular structure.

[0013] Furthermore, the connecting device includes an air deflation device, an auxiliary hook fixing hole, a connecting plate and a wedge sleeve. The auxiliary hook fixing hole is arranged at the lower right corner of the pulley frame, the air deflation device is arranged at the bottom of the arm end, the connecting plate is arranged at the bottom of the air deflation device, and the wedge sleeve is arranged at the bottom of the connecting plate.

[0014] Furthermore, the specific process of switching from four-rate to two-rate is as follows: in the four-rate rope threading mode, lift the hook until the two-rate connecting hole coincides with the auxiliary hook fixing hole on the pulley frame, which is the two-rate switching position. Pass the switching pin through the two-rate connecting hole and the auxiliary hook fixing hole, 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-rate rope threading to two-rate rope threading.

[0015] Furthermore, the specific process of switching from four-rate to three-rate is as follows: in the four-rate rope threading mode, lift the hook to the two-rate switching position and continue to lift it until the wedge sleeve at the end of the wire rope is completely stuck in the wedge sleeve fixing block of the auxiliary hook. At this time, continue to lift the hook. The wedge sleeve at the end of the wire rope is stuck on the auxiliary hook, and the wire rope tension originally borne by the deflation 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 extreme position, this is the three-rate switching position. The deflation 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-rate connecting hole on the auxiliary hook, insert the switching pin into the connecting hole and the three-rate connection, lower the hook, and complete the switch from four-rate rope threading to three-rate rope threading.

[0016] Furthermore, in the triple-rate rope threading mode, the triple-rate is switched to the reverse operation at the quadruple rate, the rope threading mode is switched to the quadruple rate, and then the quadruple rate is switched to the double rate, completing the switch from the triple-rate rope threading to the double-rate rope threading.

[0017] The present invention has the following beneficial effects due to the adoption of the above technical solution:

[0018] The present invention completes the switching of the four-fold / three-fold / two-fold rope threading mode of the boom tower crane hook without disassembling and rethreading the wire rope, and does not affect the project construction progress while giving full play to the lifting performance of the boom tower crane. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the switching system of the present invention;

[0020] Figure 2 It is a schematic diagram of the overall structure of the hook of the present invention;

[0021] Figure 3 It is a schematic diagram of the arm end structure of the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of switching from quadruple rate to double rate of the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of switching from quadruple rate to triple rate according to the present invention.

[0024] In the accompanying drawings, 1-arm, 2-wire rope, 3-hook, 4-main hook, 5-auxiliary hook, 6-pin, 7-block, 8-wedge sleeve fixing block, 9-double-rate connecting hole, 10-triple-rate connecting hole, 11-switching pin, 12-arm end, 13-deflation device, 14-rope output pulley, 15-pulley frame, 16-auxiliary hook fixing hole, 17-connecting plate, 18-wedge sleeve, 19-insertion of switching pin, 20-removal of pin. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are only for the purpose of enabling the reader to have a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be implemented even without these specific details.

[0026] like Figure 1As shown, a hook ratio switching system for a small and medium-sized boom tower crane includes a boom 1, a wire rope 2 and a hook 3. The boom 1 is connected to the hook 3 through the wire rope 2. The hook 3 includes a main hook 4 and an auxiliary hook 5. The auxiliary hook 5 is arranged at the upper end of the main hook 4 and is detachably arranged with 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, the auxiliary hook 5 is connected to the boom 1 through the wire rope 2, and the auxiliary hook 5 is connected to the main hook 4. The wire rope is discharged from the rope outlet pulley, and passes through the main hook pulley, the pulley frame pulley, and the auxiliary hook pulley in sequence, and the end is fixed on the wedge sleeve. The rope threading method is a four-fold rope threading method.

[0027] When the auxiliary hook 5 is connected to the boom 1, and the boom 1 is connected to the hook 3 through the wire rope 2, it is in a state of switching from four-fold rate to two-fold rate. 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 through the wire rope 2, it is in a state of switching from four-fold rate to three-fold rate.

[0028] In the embodiment of the present invention, Figure 2 As shown, a pin hole is provided at the bottom of the auxiliary hook 5, and a pin 6 is provided to be detachably connected to the main hook 4 through the pin hole. Blocks 7 are provided on both sides of the auxiliary hook 5, and a double-rate connection hole 2 and a triple-rate connection hole 10 are provided on the upper end of the auxiliary hook 5. The double-rate connection hole 2 is provided in the middle position, and the triple-rate connection hole 10 is provided on the right side of the double-rate connection hole 2. A wedge sleeve fixing block 8 is provided on the auxiliary hook 5. A switching pin 11 is provided at the top of the auxiliary hook 5, and it is detachably connected to the boom 1 through the switching pin 11. The lower part of the auxiliary hook is connected to the main hook with a pin; there are blocks at the lower left and lower right positions of the auxiliary hook to control the maximum tilt 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; two connecting holes are 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 modes of the hook can be switched; a wedge sleeve fixing block is welded on 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 in triple-rate rope threading mode.

[0029] In the embodiment of the present invention, Figure 3As shown, the boom 1 includes a boom end 12, a rope pulley 14, a pulley frame 15 and a connecting device. The rope pulley 14, the pulley frame 15 and the connecting device are all arranged at the bottom of the boom end 12, and the boom end 12 is arranged in a triangular structure. The connecting device includes a deflation device 13, a secondary hook fixing hole 16, a connecting plate 17 and a wedge sleeve 18. The secondary hook fixing hole 16 is arranged at the lower right corner of the pulley frame 15, the deflation device 13 is arranged at the bottom of the boom end 12, the connecting plate 17 is arranged at the bottom of the deflation device 13, and the wedge sleeve 18 is arranged at the bottom of the connecting plate 17. The boom end has a pulley frame, a deflation device and a rope pulley. The lower right part of the pulley frame has a secondary hook fixing hole, which is used to fix the secondary hook in the double-rate rope threading mode; the lower part of the deflation device is connected to two connecting plates in sequence with a pin shaft, which is used to loosen the end of the wire rope when switching to the triple-rate rope threading mode; the wedge sleeve is connected below the connecting plate, and the wedge sleeve fixes the end of the wire rope.

[0030] 1. If Figure 4 As shown, in the four-rate rope threading mode, when the hook is lifted to the point where the two-rate connecting hole coincides with the auxiliary hook fixing hole on the pulley frame, this is the two-rate switching position, the switching pin is passed through the above two holes, the auxiliary hook is fixed on the end of the boom, the connecting pin between the main hook and the auxiliary hook is removed, the hook is lowered, and the four-rate rope threading is switched to the two-rate rope threading.

[0031] 2. If Figure 5 As shown, in the four-rate rope threading mode, the hook is lifted to the two-rate switching position and then continued to be lifted until the wedge sleeve at the end of the wire rope is completely stuck in the wedge sleeve fixing block of the auxiliary hook; at this time, the hook is continued to be lifted, and the wedge sleeve at the end of the wire rope is stuck on the auxiliary hook, and the wire rope tension originally borne by the deflation device is gradually transferred to the auxiliary hook, and the auxiliary hook tilts to the right under the action of the wire rope tension; when the auxiliary hook tilts to the extreme position, this is the three-rate switching position, the deflation device no longer bears the wire rope tension, and the two connecting plates are in a relaxed state; remove the pin shaft between the connecting plates, align the connecting hole of the lower connecting plate with the three-rate connecting hole on the auxiliary hook, insert the switching pin shaft into the above two holes, lower the hook, and complete the switch from the four-rate rope threading to the three-rate rope threading.

[0032] 3. In the triple-rate threading mode, press Figure 5 Reverse the steps shown in the figure to switch the rope threading mode to four times the rate, and then press Figure 4 The steps shown are to switch to double rate, and after completing triple rate threading, switch to double rate threading.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A hook ratio switching system for small and medium-sized boom tower cranes, characterized in that: The invention comprises a boom (1), a steel wire rope (2) and a hook (3), wherein the boom (1) is connected to the hook (3) via the steel wire rope (2), the hook (3) comprises a main hook (4) and an auxiliary hook (5), the auxiliary hook (5) is arranged at the upper end of the main hook (4) and is detachably arranged from 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), the auxiliary hook (5) is connected to the boom (1) via the steel wire rope (2), and at the same time the auxiliary hook (5) is connected to the main hook (4); When the auxiliary hook (5) is connected to the boom (1), and the boom (1) is connected to the hook (3) through the wire rope (2), it is in a state of switching from a four-fold rate to a two-fold rate; 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) through the wire rope (2), it is in a state of switching from a four-fold rate to a three-fold rate.

2. The hook ratio switching system for a small to medium-sized boom tower crane according to claim 1 is characterized in that: A pin shaft hole is arranged at the bottom of the auxiliary hook (5), and a pin shaft (6) is arranged to be detachably connected with the main hook (4) through the pin shaft hole.

3. The hook ratio switching system for a small to medium-sized boom tower crane according to claim 1 is characterized in that: Stoppers (7) are arranged on both sides of the auxiliary hook (5); a double-rate connection hole (2) and a triple-rate connection hole (10) are arranged on the upper end of the auxiliary hook (5); the double-rate connection hole (2) is arranged in the middle position; the triple-rate connection hole (10) is arranged on the right side of the double-rate connection hole (2); and a wedge sleeve fixing block (8) is arranged on the auxiliary hook (5).

4. The hook ratio switching system for a small to medium-sized boom tower crane according to claim 1, characterized in that: A switching pin shaft (11) is provided at the top end of the auxiliary hook (5), and is detachably connected to the arm frame (1) via the switching pin shaft (11).

5. The hook ratio switching system for a small to medium-sized boom tower crane according to claim 1, characterized in that: The arm (1) comprises an arm end (12), a rope outlet pulley (14), a pulley frame (15) and a connecting device. The rope outlet pulley (14), the pulley frame (15) and the connecting device are all arranged at the bottom of the arm end (12). The arm end (12) is arranged in a triangular structure.

6. A hook ratio switching system for small and medium-sized boom tower cranes according to claim 5, characterized in that: The connecting device comprises a deflation device (13), a secondary hook fixing hole (16), a connecting plate (17) and a wedge sleeve (18), wherein the secondary hook fixing hole (16) is arranged at the lower right corner of the pulley frame (15), the deflation device (13) is arranged at the bottom of the arm frame end (12), the connecting plate (17) is arranged at the bottom of the deflation device (13), and the wedge sleeve (18) is arranged at the bottom of the connecting plate (17).

7. The hook ratio switching system for a small to medium-sized boom tower crane according to claim 1, characterized in that: The specific process of switching from four-rate to two-rate is as follows: in the four-rate rope threading mode, lift the hook until the two-rate connecting hole coincides with the auxiliary hook fixing hole on the pulley frame, which is the two-rate switching position. Pass the switching pin through the two-rate connecting hole and the auxiliary hook fixing hole, 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-rate rope threading to two-rate rope threading.

8. The hook ratio switching system for a small to medium-sized boom tower crane according to claim 1, characterized in that: The specific process of switching from four-rate to three-rate is as follows: in the four-rate rope threading mode, lift the hook to the two-rate switching position and continue to lift it until the wedge sleeve at the end of the wire rope is completely stuck in the wedge sleeve fixing block of the auxiliary hook. At this time, continue to lift the hook. The wedge sleeve at the end of the wire rope is stuck on the auxiliary hook, and the wire rope tension originally borne by the air release 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 extreme position, this is the three-rate switching position. The air release 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-rate connecting hole on the auxiliary hook, insert the switching pin into the connecting hole and the three-rate connection, lower the hook, and complete the switch from four-rate rope threading to three-rate rope threading.

9. The hook ratio switching system for a small to medium-sized boom tower crane according to claim 1, characterized in that: In the triple-rate rope threading mode, press the quadruple rate to switch to the triple-rate reverse operation, switch the rope threading mode to the quadruple rate, and then press the quadruple rate to switch to the double rate, completing the switch from the triple-rate rope threading to the double-rate rope threading.

Images