Safety lifting hook of tower crane

Abstract

The invention discloses a safety hook of a tower crane, which comprises a frame body (12) and a crane steel wire rope (1), the frame body (12) is provided with a hook body (13) and two groups of pulleys (14), the crane steel wire rope (1) is wound on the pulleys (14), the safety hook is characterized in that the frame body (12) is also provided with a safety mechanism, the safety mechanism at least comprises a limiting mechanism and a locking mechanism, and the limiting mechanism is connected with the locking mechanism. The locking mechanism comprises a self-locking fan-shaped swing block (8) and a self-locking baffle (9), the self-locking fan-shaped swing block (8) and the self-locking baffle (9) are arranged on the two sides of the crane steel wire rope (1) respectively, the self-locking fan-shaped swing block (8) can swing towards the self-locking baffle (9) when the steel wire rope is broken, and the self-locking fan-shaped swing block (8) and the self-locking baffle (9) clamp the crane steel wire rope (1) after swinging.

Description

Technical Field

[0001] The invention belongs to the field of cranes, and in particular relates to a safety hook of a crane. Background Art

[0002] In recent years, the country's investment in infrastructure construction has continued to increase, high-rise and super-high-rise buildings have gradually increased, and competition in the construction market has become increasingly fierce, forcing construction companies to continuously improve their productivity. The construction process is developing towards mechanized, intelligent, and green and environmentally friendly buildings. During this period, tower cranes have been widely used on construction sites due to their high work efficiency, large working range, simple, safe and reliable structure, etc.

[0003] The tower crane hooks used in today's construction sites are all double-pulley structures. This type of hook cannot prevent heavy objects from falling due to the breaking of the lifting wire rope, which can easily cause safety accidents such as falling objects injuring people during use, posing a safety hazard. In addition, the crane rope breaking accident has not been effectively solved. In order to effectively prevent production safety accidents caused by the main rope breaking of tower cranes, the safety and reliability of lifting equipment can be improved.

[0004] Therefore, the applicant has proposed a safety hook for a tower crane which has a simple structure, good use effect, and can be used to hook when the crane wire rope breaks to avoid safety accidents. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a safe and reliable crane hook.

[0006] When a rope breaks during the operation of a lifting machine, heavy objects may fall, causing serious safety accidents. The present application proposes a device with high safety performance and simple structure, which can prevent heavy objects from falling when the rope breaks.

[0007] To achieve the above object, the present invention provides the following technical solutions: A tower crane safety hook comprises a frame 12 and a crane wire rope 1, wherein the frame 12 is provided with a hook body 13 and two sets of pulleys 14, and the crane wire rope 1 is wound around the pulleys 14. The hook is characterized in that a safety mechanism is also provided on the frame 12, and the safety mechanism at least comprises a limiting mechanism and a locking mechanism, and the locking mechanism comprises a self-locking fan-shaped pendulum block 8 and a self-locking baffle 9, wherein the self-locking fan-shaped pendulum block 8 and the self-locking baffle 9 are respectively arranged on both sides of the crane wire rope 1, and when the wire rope breaks, the self-locking fan-shaped pendulum block 8 can swing toward the direction of the self-locking baffle 9, and the self-locking fan-shaped pendulum block 8 and the self-locking baffle 9 after swinging clamp the crane wire rope 1.

[0008] As an improvement, the limiting mechanism includes a rocker arm 5, a lever 6, a pull rope 11 and a tension spring 10. One end of the rocker arm 5 is hinged on the frame 12, and the other end is connected to the driving mechanism. The driving mechanism can drive the rocker arm to swing. The middle part of the lever 6 is hinged on the frame 12, and one end of the lever 6 is engaged on the rocker arm 5. The other end of the lever 6 is connected to the straight arm 7 provided on the self-locking fan-shaped pendulum block 8 through the pull rope 11. The self-locking fan-shaped pendulum block 8 and the straight arm 7 are rigidly connected to form a fixed angle. One end of the tension spring 10 is connected to the straight arm 7, and the other end is connected to the frame 12. The swing of the rocker arm 5 can separate the lever 6 from the rocker arm 5. After separation, the self-locking fan-shaped pendulum block 8 can swing toward the direction of the self-locking baffle 9 to clamp the crane wire rope 1.

[0009] As an improvement, the self-locking sector-shaped pendulum block 8 and the self-locking baffle plate 9 are arranged between the two sets of pulleys 14 .

[0010] As an improvement, the self-locking sector-shaped pendulum blocks 8 are provided in two groups, which are respectively arranged at the two ends of the self-locking baffle 9 and are both arranged between the two groups of pulleys 14.

[0011] As an improvement, the driving mechanism at least includes a weightlessness monitoring switch 2, an electromagnetic coil 3, a moving iron core 4 and a power supply unit. The weightlessness monitoring switch 2 includes a steel ball 15, a contact 17 and a conical spring 16. When the steel wire rope breaks, the frame 12 loses weight, and the steel ball 15 touches the contact 17 to connect the circuit composed of the weightlessness monitoring switch 2, the electromagnetic coil 3, the moving iron core 4 and the power supply unit. The electromagnetic coil 3 drives the moving iron core 4 to reciprocate, and one end of the moving iron core 4 is connected to the free end of the rocker arm 5.

[0012] Compared with the prior art, the present invention has the advantages of simple structure, good use effect, and the ability to stop the hook when the crane wire rope breaks, thereby avoiding safety accidents.

[0013] In actual use: a weightlessness monitoring switch is installed on the outer side of the hook frame 12, that is, when the lifting wire rope on either side of the hook breaks at any point, the hook will be in a weightlessness state. At this time, the weightlessness monitoring switch will detect the weightlessness state of the hook at the first time, and the steel ball in the weightlessness monitoring switch will also be in a weightlessness state. The weightless steel ball 15 will lose the pressure on the conical spring 16. Under the action of the tension of the conical spring, the steel ball moves upward to the door contact 17, thereby triggering the microswitch to turn on the electromagnetic coil circuit to close, and the electromagnetic coil 3 can drive the moving iron core 4 to reciprocate, and the rocker arm 5 is pushed to swing under the action of the electromagnetic force. The rocker arm 5 swings After the movement, the lever 6 is separated from the rocker arm 5, and the lever rotates clockwise under the action of the tension spring 10. The two self-locking fan-shaped pendulum blocks 8 rotate in their respective self-locking directions under the action of the tension spring 10. The self-locking fan-shaped pendulum blocks simultaneously produce a self-wedge effect with the lower baffle under the action of the tension spring 10 and the traction force of the wire rope, thereby locking the wire rope and stopping the hook from falling, thereby playing a protective role. The device can play a protective role in the event of a sudden disconnection of the wire rope. It is safe and reliable to use, and effectively curbs lifting injuries caused by broken lifting wire ropes. The indirect economic benefits of the belt device are significantly improved after use, and the promotion prospects are broad.

[0014] A weightlessness monitoring switch and a self-locking fan-shaped pendulum block are installed on the hook. When the weightlessness monitoring switch detects that the hook is weightless, the wire rope is locked through the connecting rod mechanism and the pendulum block self-locking device to prevent the hook from falling, thereby playing a safety protection role.

[0015] It realizes the automatic detection of crane hook weightlessness and the real-time tracking of crane rope breakage. The improvement cost is low and the protection effect is obvious. The device can lock the main rope in the first time to prevent the hook from falling.

[0016] By installing a weightlessness monitoring switch on the outside of the hook, the physical state of the hook losing weight can be detected in real time. That is, when the lifting wire rope on either side of the hook breaks at any point, the hook is in a weightlessness state. At this time, the weightlessness monitoring switch can quickly capture the physical phenomenon of the hook losing weight, and will connect the trigger linkage circuit. Through the connecting rod self-locking device, the lifting rope is clamped to prevent the hook from falling, thereby playing a protective role in preventing the hook from falling.

[0017] A weightlessness monitoring switch and a fan-shaped pendulum self-locking device are installed; they can provide protection against rope breakage throughout the entire length of the lifting wire rope, preventing the hook from falling and causing production safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the structure of the limiting mechanism and the driving mechanism.

[0020] As shown in the figure: 1 is the crane wire rope, 2 is the weightlessness monitoring switch, 3 is the electromagnetic coil, 4 is the moving iron core, 5 is the rocker arm, 6 is the lever, 7 is the straight arm, 8 is the self-locking fan-shaped pendulum block, 9 is the self-locking baffle, 10 is the tension spring, 11 is the pull rope, 12 is the frame, 13 is the hook body, 14 is the pulley, 15 is the steel ball, 16 is the conical spring, and 17 is the contact. DETAILED DESCRIPTION

[0021] The above contents of the present invention are further described in detail below through embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1: Reference Figure 1 , is a structural schematic diagram of Example 1 of the present invention, which discloses a safety hook for a tower crane, comprising a frame 12 and a crane wire rope 1, wherein the frame 12 is provided with a hook body 13 and two sets of pulleys 14, and the crane wire rope 1 is wound around the pulleys 14, and is characterized in that: a safety mechanism is also provided on the frame 12, and the safety mechanism at least includes a limiting mechanism and a locking mechanism, and the locking mechanism includes a self-locking fan-shaped pendulum block 8 and a self-locking baffle 9, and the self-locking fan-shaped pendulum block 8 and the self-locking baffle 9 are respectively arranged on both sides of the crane wire rope 1, and when the wire rope breaks, the self-locking fan-shaped pendulum block 8 can swing toward the direction of the self-locking baffle 9, and the self-locking fan-shaped pendulum block 8 and the self-locking baffle 9 after swinging clamp the crane wire rope 1.

[0023] As an improvement, the limiting mechanism includes a rocker arm 5, a lever 6 and a pull rope 11. One end of the rocker arm 5 is hinged on the frame 12, and the other end is connected to the driving mechanism. The driving mechanism can drive the rocker arm to swing. The middle part of the lever 6 is hinged on the frame 12, one end of the lever 6 is engaged on the rocker arm 5, and the other end of the lever 6 is connected to the self-locking fan-shaped pendulum block 8 through the pull rope 11. The swing of the rocker arm 5 can separate the lever 6 from the rocker arm 5. After separation, the self-locking fan-shaped pendulum block 8 can swing toward the direction of the self-locking baffle 9 to clamp the crane wire rope 1.

[0024] As an improvement, a tension spring 10 is further provided, one end of which is connected to the self-locking fan-shaped pendulum block 8, and the other end is connected to the crane wire rope 1 or the self-locking baffle 9; or a straight arm 7 is provided on the self-locking fan-shaped pendulum block 8, a pull rope 11 is connected to the straight arm 7, one end of the tension spring 10 is also connected to the straight arm 7, and the other end is connected to a frame 12, a pin is provided on the frame 12, and the tension spring 10 is connected to the pin of the frame 12.

[0025] As an improvement, the self-locking sector-shaped pendulum block 8 and the self-locking baffle plate 9 are arranged between the two sets of pulleys 14 .

[0026] As an improvement, the self-locking sector-shaped pendulum blocks 8 are provided in two groups, which are respectively arranged at the two ends of the self-locking baffle 9 and are both arranged between the two groups of pulleys 14.

[0027] As an improvement, the driving mechanism at least includes a weightlessness monitoring switch 2, an electromagnetic coil 3, a moving iron core 4 and a power supply unit. The weightlessness monitoring switch 2 includes a steel ball 15, a contact 17 and a conical spring 16. When the steel wire rope breaks, the frame 12 loses weight. The steel ball 15 touches the contact 17 to connect the circuit composed of the weightlessness monitoring switch 2, the electromagnetic coil 3, the moving iron core 4 and the power supply unit. The electromagnetic coil 3 drives the moving iron core 4 to reciprocate. One end of the moving iron core 4 is connected to the free end of the rocker arm 5.

[0028] The frame 12 is two plate-like bodies connected by bolts to form an overhead layer in the middle. The locking mechanism is arranged in the overhead layer, and the limiting mechanism and the driving mechanism are arranged outside the overhead layer, that is, the outer surface of the plate body of the frame.

Claims

1. A tower crane safety hook, comprising a frame (12) and a crane wire rope (1), wherein the frame (12) is provided with a hook body (13) and two sets of pulleys (14), and the crane wire rope (1) is wound around the pulleys (14), characterized in that: The frame (12) is also provided with a safety mechanism, the safety mechanism at least comprising a limiting mechanism and a locking mechanism, the locking mechanism comprising a self-locking fan-shaped swing block (8) and a self-locking baffle (9), the self-locking fan-shaped swing block (8) and the self-locking baffle (9) being respectively arranged on both sides of the crane wire rope (1), when the wire rope breaks, the self-locking fan-shaped swing block (8) can swing in the direction of the self-locking baffle (9), and the self-locking fan-shaped swing block (8) and the self-locking baffle (9) after swinging clamp the crane wire rope (1).

2. The tower crane safety hook according to claim 1, characterized in that: The limiting mechanism comprises a rocker arm (5), a lever (6), a pull rope (11) and a tension spring (10); one end of the rocker arm (5) is hinged on the frame (12), and the other end is connected to a driving mechanism, the driving mechanism can drive the rocker arm to swing; the middle part of the lever (6) is hinged on the frame (12); one end of the lever (6) is engaged with the rocker arm (5); the other end of the lever (6) is connected to a straight arm (7) provided on a self-locking fan-shaped swing block (8) through a pull rope (11); the self-locking fan-shaped swing block (8) and the straight arm (7) are rigidly connected to form a fixed angle; one end of the tension spring (10) is connected to the straight arm (7), and the other end is connected to the frame (12); the rocker arm (5) can be swung to separate the lever (6) from the rocker arm (5); after separation, the self-locking fan-shaped swing block (8) can swing in the direction of the self-locking baffle (9) to clamp the crane wire rope (1).

3. The tower crane safety hook according to claim 1, characterized in that: The self-locking sector-shaped pendulum block (8) and the self-locking baffle plate (9) are arranged between the two sets of pulleys (14).

4. The tower crane safety hook according to claim 1, characterized in that: The self-locking sector-shaped swing blocks (8) are provided in two groups, which are respectively arranged at the two ends of the self-locking baffle (9) and are both arranged between the two groups of pulleys (14).

5. The safety hook for a tower crane according to claim 1, 2, 3 or 4, characterized in that: The driving mechanism at least comprises a weightlessness monitoring switch (2), an electromagnetic coil (3), a moving iron core (4) and a power supply unit. The weightlessness monitoring switch (2) comprises a steel ball (15), a contact (17) and a conical spring (16). When the steel wire rope breaks, the frame (12) loses weight. The steel ball (15) touches the contact (17) to connect a circuit consisting of the weightlessness monitoring switch (2), the electromagnetic coil (3), the moving iron core (4) and the power supply unit. The electromagnetic coil (3) drives the moving iron core (4) to reciprocate. One end of the moving iron core (4) is connected to the free end of the rocker arm (5).

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