Large luffing jib tower crane hook multiplying power switching system

Abstract

The utility model discloses a large luffing jib tower crane hook multiplying power switching system, which comprises a jib, a steel wire rope, a connecting plate assembly, a hook assembly and a switching pin shaft, one end of the jib is rotatably connected with a rope outlet pulley, the steel wire rope is contacted with the rope outlet pulley, one end of the connecting plate assembly is connected with the jib, and the other end of the connecting plate assembly is connected with the steel wire rope. The lifting hook assembly comprises an outer hook, an inner hook and a hook head, the outer hook is provided with a one-multiplying-power fixing hole, a two-multiplying-power fixing hole, a one-multiplying-power limiting piece and a two-multiplying-power limiting piece, the hook head is connected with the outer hook, and the switching pin shaft is connected to the outer hook and used for being matched with the one-multiplying-power fixing hole or the two-multiplying-power fixing hole so as to limit the inner hook. On the premise that the steel wire rope is not disassembled and wound again, the one-to-two multiplying power rope penetrating mode of the lifting hook of the movable arm tower crane is switched back and forth, the switching operation is simple and convenient, the switching procedures are greatly reduced, the switching efficiency is improved, and the project construction progress is not influenced while the hoisting performance of the movable arm tower crane is fully exerted.

Description

TECHNICAL FIELD

[0001] The utility model relates to tower crane hook ratio switching technical field especially relates to a large -scale luffing tower crane hook ratio switching system. BACKGROUND

[0002] In order to give full play to the hoisting performance of large -scale luffing tower crane, adopts two ratio rope threading mode in the initial stage of tower crane use, when the tower crane jacking heightens to the steel wire rope and cannot satisfy two ratio rope threading mode, dismounts and rethreading steel wire rope, switches to one ratio rope threading mode.

[0003] For two ratio rope threading mode, the steel wire rope end is fixed on the arm frame end, for one ratio rope threading mode, the steel wire rope end is fixed on the hook, when switching from two ratio to one ratio rope threading mode along with the tower crane jacking heightening in the construction process, needs to dismount and rethreading steel wire rope, reduces the construction efficiency. SUMMARY

[0004] The utility model discloses a large -scale luffing tower crane hook ratio switching system, and under the premise of not dismounting and rethreading steel wire rope, completes the back and forth switching of luffing tower crane hook two ratio rope threading mode, and switching operation is simple, greatly reduces switching procedure, improves switching efficiency, gives full play to the hoisting performance of luffing tower crane, and does not affect project construction progress.

[0005] In order to realize the above-mentioned utility model purpose, the technical scheme that the utility model adopts is as follows:

[0006] According to one aspect of the utility model, a large -scale luffing tower crane hook ratio switching system is provided, including arm frame, steel wire rope, connecting plate assembly, hook assembly and switching pin shaft;

[0007] One end of the arm frame is rotatably connected with the rope outlet pulley, the steel wire rope passes through the rope outlet pulley and contacts the rope outlet pulley;

[0008] The connecting plate assembly includes first connecting plate, second connecting plate and wedge sleeve, the first connecting plate is connected with the arm frame, the second connecting plate is detachably connected with the first connecting plate, the wedge sleeve is connected with the second connecting plate, and one end of the steel wire rope is fixedly connected with the wedge sleeve;

[0009] The hook assembly includes outer hook, inner hook and hook head;

[0010] The inner hook is rotatably connected with the outer hook, a fixed pulley is arranged on the inner hook, the steel wire rope passes through and contacts the fixed pulley, a wedge sleeve fixing block for fixing the wedge sleeve is arranged on the inner hook, and the steel wire rope passes through the wedge sleeve fixing block;

[0011] A one-ratio fixing hole and a two-ratio fixing hole are arranged on the outer hook, and a one-ratio limiting piece and a two-ratio limiting piece are fixedly arranged on the outer hook;

[0012] The hook head is connected with the outer hook;

[0013] The switching pin shaft is connected on the outer hook and is matched with the one-ratio fixing hole or the two-ratio fixing hole to limit the inner hook.

[0014] Preferably, a deflation device is further arranged, one end of the deflation device is connected with the arm support, and the other end of the deflation device is connected with the first connecting plate.

[0015] Preferably, a first pin shaft is further arranged, and the first connecting plate is connected with the second connecting plate through the first pin shaft.

[0016] Preferably, a second pin shaft is further arranged, and the second connecting plate is connected with the wedge sleeve through the second pin shaft.

[0017] Preferably, a connecting plate fixing hole is further arranged on the outer hook, and the connecting plate fixing hole is connected with the second connecting plate through a third pin shaft.

[0018] Preferably, a rope blocking pulley is further arranged on the inner hook and is used for extruding the steel wire rope.

[0019] Preferably, the inner side of the outer hook is hollow, and the inner hook is arranged in the inner side of the outer hook.

[0020] Preferably, the one-ratio limiting piece comprises a first limiting rod, and two ends of the first limiting rod are fixedly connected with the inner side of the outer hook.

[0021] Preferably, the two-ratio limiting piece comprises a second limiting rod, and two ends of the second limiting rod are fixedly connected with the inner side of the outer hook.

[0022] As the above technical scheme is adopted, the present application has the following beneficial effects:

[0023] The utility model discloses a first connecting plate and second connecting plate setting detachable, and setting a ratio fixed hole and two ratio fixed hole and a ratio limiting piece and two ratio limiting piece on outer hook, realize the location of inner hook, only need to change position to a point position pin shaft, under the premise of not disassembling and rethreading steel wire rope, complete the back and forth switching of the one or two ratio rope threading mode of the movable arm tower crane hook, and the switching operation is simple, greatly reduces the switching procedure, improves switching efficiency, fully develops the hoisting performance of movable arm tower crane, and does not influence project construction progress. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 It is the whole structure schematic diagram of the utility model;

[0025] Fig. 2 It is the mechanism schematic diagram of the utility model's hook assembly;

[0026] Fig. 3 It is the two ratio switching one ratio process schematic diagram of the utility model;

[0027] In the drawings, 1, jib; 2, steel wire rope; 3, rope pulley; 4, first connecting plate; 5, second connecting plate; 6, wedge sleeve; 7, deflation device; 8, outer hook; 9, inner hook; 10, hook head; 11, fixed pulley; 12, wedge sleeve fixed block; 13, one ratio fixed hole; 14, two ratio fixed hole; 15, one ratio limiting piece; 16, two ratio limiting piece; 17, switching pin shaft; 18, connecting plate fixed hole; 19, rope pulley. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the following preferred embodiments are referred to the drawings and are given, and the utility model is further explained in detail. However, it should be explained that, many details listed in the specification are only for making the reader have a thorough understanding of one or more aspects of the utility model, and the aspects of the utility model can be realized even without these specific details.

[0029] Please refer to Figs. 1 to 3 The utility model provides a large movable arm tower crane hook ratio switching system, and the technical scheme is as follows:

[0030] The application discloses a hook ratio switching system of a large-scale luffing tower crane, which comprises a boom, a steel wire rope, a connecting plate assembly, a hook assembly and a switching pin shaft.

[0031] In the double ratio state, one end of the steel wire rope is connected with the crane, the crane is used for controlling the movement of the steel wire rope, and the other end of the steel wire rope is connected with the connecting plate assembly.

[0032] The connecting plate assembly comprises a first connecting plate, a second connecting plate and a wedge sleeve. The first connecting plate is arranged behind the wire rope pulley arranged at the lower side of the end of the boom, and a deflation device is arranged between the first connecting plate and the boom. The deflation device is used for releasing the internal stress of the steel wire rope, so as to solve the problem of internal stress accumulation of the steel wire rope in the hoisting process and relax the end of the steel wire rope when the one ratio wire rope passing mode is switched. One end of the deflation device is connected with the boom, and the other end of the deflation device is connected with the first connecting plate. The second connecting plate is detachably connected with the first connecting plate. Specifically, a first connecting hole is formed in the first connecting plate, a second connecting hole is formed in the second connecting plate, the first connecting hole is connected with the second connecting hole through a first pin shaft, and after the first connecting hole and the second connecting hole are aligned, the first pin shaft is respectively inserted into the first connecting hole and the second connecting hole, so that the first connecting plate and the second connecting plate are connected. The first connecting plate and the second connecting plate can be separated by taking the first pin shaft out of the first connecting hole and the second connecting hole.

[0033] One end of the second connecting plate, away from the first connecting plate, is provided with the wedge sleeve. The wedge sleeve is detachably connected with the second connecting plate. Specifically, a third connecting hole is formed in the second connecting plate, a fourth connecting hole is formed in the wedge sleeve, the third connecting hole is connected with the fourth connecting hole through a second pin shaft, and after the third connecting hole and the fourth connecting hole are aligned, the second pin shaft is respectively inserted into the third connecting hole and the fourth connecting hole, so that the second connecting plate and the wedge sleeve are connected. The end of the steel wire rope is fixedly connected with the wedge sleeve. The wedge sleeve is used for fixing the steel wire rope. By passing the steel wire rope through the wedge sleeve and applying appropriate tension, the fixed position of the steel wire rope in the wedge sleeve can be ensured, so that movement or falling of the steel wire rope in the use process is prevented.

[0034] In the double ratio state, the hook assembly is hung on the steel wire rope.

[0035] The hook assembly comprises an outer hook, an inner hook and a hook head. The inner side of the outer hook is hollow. The inner hook is arranged on the inner side of the outer hook, and the inner hook is rotatably connected with the outer hook. Specifically, a first inner hook connecting hole is formed on the outer hook, and a second inner hook connecting hole is formed on the inner hook. The first inner hook connecting hole is connected with the second inner hook connecting hole through a rotating shaft, so that the inner hook and the outer hook can rotate relative to each other. The inner side of the inner hook is hollow, and a fixed pulley is arranged on the inner side of the inner hook. The fixed pulley can rotate relative to the inner hook and is used in a two-ratio rope threading mode. The steel wire rope passes through the fixed pulley and contacts the fixed pulley.

[0036] A wedge sleeve fixing block for fixing the wedge sleeve is arranged on the inner hook. The steel wire rope passes through the wedge sleeve fixing block, and the wedge sleeve is used to fix the end of the steel wire rope when the hook is in a one-ratio rope threading mode. When the crane recovers the steel wire rope, the wedge sleeve continuously approaches the inner hook until the wedge sleeve contacts the wedge sleeve fixing block. The wedge sleeve fixing block can limit the wedge sleeve, so that the steel wire rope cannot move any more. After the wedge sleeve contacts the wedge sleeve fixing block, the wedge sleeve will be clamped on the wedge sleeve fixing block under the continuous pulling force of the crane.

[0037] The hook head is rotatably connected to the bottom of the outer hook. Specifically, a first hook head connecting hole is formed on the bottom of the outer hook, and a second hook head connecting hole is formed on the hook head. The first hook head connecting hole is connected with the second hook head connecting hole through a rotating shaft, so that the outer hook and the hook head can rotate relative to each other. The hook head is used to hook the heavy object.

[0038] A one-ratio fixing hole and a two-ratio fixing hole are formed on the outer hook. The one-ratio fixing hole is located on the right oblique upper side of the outer hook. The two-ratio fixing hole is located on the left oblique upper side of the outer hook. A two-ratio limiting piece is arranged on the right oblique lower side of the one-ratio fixing hole. The two-ratio limiting piece comprises a first limiting rod, and the two ends of the first limiting rod are fixedly connected with the inner side of the outer hook. A one-ratio limiting piece is arranged on the left oblique lower side of the two-ratio fixing hole. The two-ratio limiting piece comprises a second limiting rod, and the two ends of the second limiting rod are fixedly connected with the inner side of the outer hook. The two-ratio limiting piece and the one-ratio limiting piece are used to limit the limit position of the inner hook in the two-ratio state and the one-ratio state.

[0039] The switching pin shaft is connected with the upper part of the outer hook through a chain. One end of the chain is fixedly connected with the outer hook, and the other end of the chain is fixedly connected with the switching pin shaft. The switching pin shaft is used to cooperate with the one-ratio fixing hole or the two-ratio fixing hole to limit the inner hook. Specifically, the switching pin shaft is inserted through the two-ratio fixing hole or the one-ratio fixing hole to fix the position of the inner hook, so that the hook is kept in the two-ratio or one-ratio rope threading mode.

[0040] A connecting plate fixing hole is also formed on the outer hook, and the connecting plate fixing hole is connected with the second connecting plate through a third pin shaft.

[0041] Further, a rope blocking pulley is arranged on the inner hook and is used to limit the position of the steel wire rope when the hook is in the one-ratio rope threading mode.

[0042] In use, if it is needed to switch from the two-fold rope threading mode to the one-fold rope threading mode, the following steps are specifically taken: in the two-fold rope threading mode, the hook is lifted until the wedge sleeve at the end of the steel wire rope is completely clamped in the wedge sleeve fixing block of the inner hook, the switching pin shaft is pulled out from the left two-fold fixing hole, at this time the hook is continuously lifted, the wedge sleeve at the end of the steel wire rope is clamped in the wedge sleeve fixing block of the inner hook, the inner hook is inclined to the left under the action of the tension of the steel wire rope, the tension of the steel wire rope originally borne by the deflation device is gradually transferred to the inner hook, at the same time the hook as a whole gradually translates to the right due to the change of force, the rope blocking pulley is in contact with the steel wire rope, when the inner hook is inclined to contact the one-fold limiting piece, the switching pin shaft is inserted into the one-fold fixing hole, which is the one-fold switching position, the hook is continuously lifted slightly, the deflation device no longer bears the tension of the steel wire rope, the first connecting plate and the second connecting plate are in a relaxed state, the first pin shaft between the first connecting plate and the second connecting plate is removed, the second connecting hole of the second connecting plate is aligned with the connecting plate fixing hole on the outer hook, the pin shaft is inserted into the second connecting hole and the connecting plate fixing hole respectively, the hook is lowered, and the two-fold rope threading is switched to the one-fold rope threading.

[0043] If it is needed to switch from the two-fold rope threading mode to the one-fold rope threading mode, in the one-fold rope threading mode, the reverse operation of the above-mentioned switching from the two-fold rope threading mode to the one-fold rope threading mode is performed, and the one-fold rope threading is switched to the two-fold rope threading.

[0044] The above only describes preferred embodiments of the present application, and it should be noted that for ordinary skilled persons in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A hook ratio switching system for a large luffing jib tower crane, characterized in that, Includes boom, wire rope, connecting plate assembly, hook assembly, and switching pin; One end of the boom is rotatably connected to a rope outlet pulley, and the wire rope passes around the rope outlet pulley and contacts the rope outlet pulley; The connecting plate assembly includes a first connecting plate, a second connecting plate, and a wedge sleeve. The first connecting plate is connected to the boom, the second connecting plate is detachably connected to the first connecting plate, the wedge sleeve is connected to the second connecting plate, and the wedge sleeve is fixedly connected to one end of the wire rope. The hook assembly includes an outer hook, an inner hook, and a hook head; The inner hook and the outer hook are rotatably connected. The inner hook is provided with a fixed pulley. The wire rope passes around the fixed pulley and contacts the fixed pulley. The inner hook is provided with a wedge sleeve fixing block for fixing the wedge sleeve. The wire rope passes through the wedge sleeve fixing block. The outer hook has a first magnification fixing hole and a second magnification fixing hole, and a first magnification limiting member and a second magnification limiting member are fixedly installed on the outer hook; The hook head is connected to the outer hook; The switching pin is connected to the outer hook and is used to cooperate with the first magnification fixing hole or the second magnification fixing hole to limit the inner hook.

2. The hook ratio switching system for a large luffing jib tower crane according to claim 1, characterized in that: It is also equipped with a venting device, one end of which is connected to the boom and the other end of which is connected to the first connecting plate.

3. The hook ratio switching system for a large luffing jib tower crane according to claim 1, characterized in that: It also includes a first pin, through which the first connecting plate is connected to the second connecting plate.

4. The hook ratio switching system for a large luffing jib tower crane according to claim 1, characterized in that: It also includes a second pin, through which the second connecting plate is connected to the wedge sleeve.

5. A hook ratio switching system for a large luffing jib tower crane according to claim 1, characterized in that: The outer hook is also provided with a connecting plate fixing hole, which is connected to the second connecting plate through a third pin.

6. A hook ratio switching system for a large luffing jib tower crane according to claim 1, characterized in that: It also includes a rope-blocking pulley, which is mounted on the inner hook and is used to compress the wire rope.

7. The hook ratio switching system for a large luffing jib tower crane according to claim 1, characterized in that: The outer hook has a hollow inner side, and the inner hook is located inside the outer hook.

8. A hook ratio switching system for a large luffing jib tower crane according to claim 7, characterized in that: The first limiting component includes a first limiting rod, the two ends of which are fixedly connected to the inner side of the outer hook.

9. A hook ratio switching system for a large luffing jib tower crane according to claim 7, characterized in that: The double-ratio limiting component includes a second limiting rod, the two ends of which are fixedly connected to the inner side of the outer hook.

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