Hoisting limiting device of tower crane

Abstract

The utility model discloses a lifting limiting device of a tower crane, which relates to the technical field of tower cranes and comprises a frame component and a lifting limiting component, and the lifting limiting component comprises a pulley, a pulley yoke, a weight limiter and an outer support wheel. An auxiliary supporting assembly is arranged in the area below the outer supporting wheel and the weight limiter. By arranging the auxiliary supporting assembly, when the hoisting capacity limiter breaks and loses efficacy, the concave supporting frame limits and supports the downward movement of the outer supporting wheel, so that the pulley yoke can be prevented from continuing to rotate downwards, the effect of temporarily supporting the pulley yoke is achieved, sudden falling of the pulley yoke is avoided, and meanwhile the hoisting capacity limiter is prevented from being damaged. When the tower crane is used, broken and invalid lifting limiters and fragments generated by breakage can be borne by the bearing net frame, potential safety hazards caused by high-altitude falling objects are avoided, in addition, the steel wire rope can be prevented from falling off from the groove of the pulley through the middle limiting wheel, and the use safety of the tower crane is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of tower crane technology, specifically a tower crane lifting limit device. Background Technology

[0002] Tower cranes are rotating cranes with their booms mounted on the upper part of a tall tower. They have a large working range and are mainly used for the vertical transportation of materials and the installation of components in the construction of multi-story and high-rise buildings. They consist of three parts: a metal structure, a working mechanism, and an electrical system. The metal structure includes the tower body, boom, base, and anchor rods. The working mechanism has four parts: hoisting, luffing, slewing, and traveling. The electrical system includes motors, controllers, switchboards, connecting lines, signaling and lighting devices, etc.

[0003] A lifting capacity limiter is a device that protects lifting machinery from accidents, ensuring that the load lifted by the crane does not exceed its rated lifting capacity. The working principle of the lifting capacity limiter is as follows:

[0004] During operation, the pressure from the main hoisting wire rope triggers the sensing element to deform. The internal metal plate generates a minute voltage change signal due to the deformation. After amplification, the voltage change signal is converted into a digital signal by a high-resolution A / D converter. The microcontroller or microprocessor acquires the digital signal and compares it with the rated value for judgment. For example, if the rated value is reached 110%, a pair of passive relay contact signals (normally closed) are output to cut off the power supply to the hoisting motor, trigger a pre-alarm for the lifting weight, and sound an alarm.

[0005] On the boom of a tower crane, the pulley frame used to install the lifting capacity limiter is only connected to the lifting capacity limiter at the end, without any additional fixing means. Once the lifting capacity limiter breaks and fails, the pulley frame will uncontrollably fall out of place under the tension of the lifting wire rope, posing a risk of injury. Based on this, a lifting capacity limiter device for tower cranes is provided. Utility Model Content

[0006] The purpose of this utility model is to provide a tower crane lifting limit device in order to solve the problems mentioned above.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a tower crane lifting restriction device, comprising a frame assembly consisting of a boom web, a first connecting seat, a second connecting seat, and a third connecting seat, and a lifting restriction assembly, wherein the first connecting seat, the second connecting seat, and the third connecting seat are horizontally distributed and fixed to the lower surface of the boom web, and the lifting restriction assembly includes a pulley, a pulley frame, a weight limiter, and an outer support wheel;

[0008] The pulley is rotatably mounted between two pulley frames. One end of each pulley frame is fixedly connected by a fixed cylinder and rotates inside the first connecting seat. One end of the weight limiter is rotatably connected to the middle area of ​​the other end of the two pulley frames, and the other end of the weight limiter is rotatably connected to the inside of the second connecting seat.

[0009] The outer support wheel is rotatably connected to the two pulley frames on opposite sides and close to the rotatable connection point between the weight limiter and the pulley frame;

[0010] An auxiliary support assembly is provided in the area below the outer support wheel and the weight limiter. In the event of the weight limiter breaking and failing, the auxiliary support assembly is used to support the outer support wheel and intercept the fragments generated by the breakage of the weight limiter.

[0011] As a further embodiment of this utility model: the auxiliary support assembly includes a concave support frame and an arc-shaped connecting arm;

[0012] Two concave support frames are provided, each located directly below the two outer support wheels. One end of each concave support frame is fixedly connected to the boom web via a vertical connecting rod. The concave support frames are used to intercept and support the downward-moving outer support wheels.

[0013] One end of the arc-shaped connecting arm is rotatably connected to the middle of the other end of the two concave support frames, and the other end of the arc-shaped connecting arm is rotatably connected to the inner side of the third connecting seat. The arc-shaped connecting arm is used to provide tension to the concave support frame, thereby ensuring the support strength of the concave support frame.

[0014] As a further improvement of this utility model: the auxiliary support component also includes a supporting mesh frame;

[0015] The arc-shaped connecting arms are distributed in the area below the weight limiter, and the receiving mesh frame is symmetrically fixed on both sides of the arc-shaped connecting arms. The receiving mesh frame is used to receive and intercept the fragments generated by the breakage of the weight limiter.

[0016] As a further embodiment of this utility model: a central limiting wheel is sleeved on the outer side of the rotating shaft of the outer support wheel at the middle position of the two pulley frames, and the arc surface of the central limiting wheel is tangent to the outer arc surface of the pulley.

[0017] As a further improvement of this utility model: the bottom of the groove inner wall of the concave support frame is provided with a number of evenly distributed drainage holes, and the drainage holes completely penetrate to the bottom of the concave support frame.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] By setting up auxiliary support components, when the lifting capacity limiter breaks and fails, the concave support frame moves downwards to support and limit the pulley frame, thus preventing it from continuing to rotate downwards and providing temporary support to the pulley frame, preventing it from suddenly falling. At the same time, the broken lifting capacity limiter and the fragments generated by the breakage can be caught by the receiving mesh frame, avoiding safety hazards caused by falling objects from heights. In addition, the central limit wheel can prevent the wire rope from falling out of the pulley groove, effectively improving the safety of tower crane operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram showing the disassembled lifting restraint component and frame component of this utility model;

[0022] Figure 3 This is a structural distribution diagram of some parts of the lifting restraint assembly of this utility model;

[0023] Figure 4 This is a structural distribution diagram of the auxiliary support component and the frame component of this utility model.

[0024] In the diagram: 1. Frame assembly; 101. Lifting boom web; 102. First connecting seat; 103. Second connecting seat; 104. Third connecting seat; 2. Lifting limiting assembly; 201. Pulley; 202. Pulley frame; 203. Weight limiter; 204. Outer support wheel; 205. Middle limiting wheel; 3. Auxiliary support assembly; 301. Concave support frame; 302. Arc-shaped connecting arm; 303. Receiving mesh frame; 304. Drainage hole. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1-4 In this embodiment of the present invention, a tower crane lifting restriction device includes a frame assembly 1 composed of a lifting boom web 101, a first connecting seat 102, a second connecting seat 103, and a third connecting seat 104, and a lifting restriction assembly 2. The first connecting seat 102, the second connecting seat 103, and the third connecting seat 104 are horizontally distributed and fixed to the lower surface of the lifting boom web 101. The lifting restriction assembly 2 includes a pulley 201, a pulley frame 202, a weight limiter 203, and an outer support wheel 204.

[0027] The pulley 201 is rotatably mounted between two pulley frames 202. One end of the two pulley frames 202 is fixedly connected by a fixed cylinder and rotates inside the first connecting seat 102. One end of the weight limiter 203 is rotatably connected to the middle area of ​​the other end of the two pulley frames 202, and the other end of the weight limiter 203 is rotatably connected to the inside of the second connecting seat 103.

[0028] The outer support wheel 204 is rotatably connected to the two pulley frames 202 on opposite sides and close to the rotatable connection point between the weight limiter 203 and the pulley frame 202;

[0029] An auxiliary support assembly 3 is provided in the area below the outer support wheel 204 and the weight limiter 203. When the weight limiter 203 breaks and fails, the auxiliary support assembly 3 is used to support the outer support wheel 204 and intercept the fragments generated by the breakage of the weight limiter 203.

[0030] The auxiliary support component 3 includes a concave support frame 301 and an arc-shaped connecting arm 302;

[0031] Two concave support frames 301 are provided. The two concave support frames 301 are located directly below the two outer support wheels 204, and one end of the two concave support frames 301 is fixedly connected to the boom web 101 through a vertical connecting rod. The concave support frames 301 are used to intercept and support the downward-moving outer support wheels 204.

[0032] One end of the arc-shaped connecting arm 302 is rotatably connected to the middle of the other end of the two concave support frames 301, and the other end of the arc-shaped connecting arm 302 is rotatably connected to the inner side of the third connecting seat 104. The arc-shaped connecting arm 302 is used to provide tension to the concave support frame 301, thereby ensuring the support strength of the concave support frame 301.

[0033] The auxiliary support component 3 also includes a receiving frame 303;

[0034] The arc-shaped connecting arms 302 are distributed in the area below the weight limiter 203, and the receiving mesh frame 303 is symmetrically fixed on both sides of the arc-shaped connecting arms 302. The receiving mesh frame 303 is used to receive and intercept the fragments generated by the breakage of the weight limiter 203.

[0035] In this embodiment, it should be noted that the crane's wire rope path passes sequentially through the middle area of ​​the two concave support frames 301, the inner side of the pulley 201, and the middle area of ​​the vertical connecting rod connecting the two concave support frames 301. The concave support frames 301 and the vertical connecting rod will not interfere with the operation of the wire rope.

[0036] When the crane is lifting, the wire rope applies a downward force to the pulley 201, and the pulley frame 202 deflects downward around the first connecting seat 102. According to the lever principle, the front end of the pulley frame 202 will move downward a greater distance, which will cause more deformation to the sensing element of the lifting weight limiter 203. The sensing element of the lifting weight limiter 203 generates a small voltage change signal due to the deformation. After the voltage change signal is amplified, it is converted into a digital signal by a high-resolution A / D converter. After the microcontroller or microprocessor obtains the digital signal, it compares and judges it with the set lifting weight. For example, if it reaches 110% of the rated value, it outputs a pair of passive relay contact signals (normally closed) to cut off the power supply of the lifting motor, thereby limiting the lifting action of the load and achieving the purpose of lifting weight limit.

[0037] If the lifting capacity limiter 203 breaks and fails during this process, the front end of its pulley frame 202 loses its limit. At this time, the downward deflection angle of the pulley frame 202 increases slightly. The outer support wheel 204 rotates downward to the inside of the concave support frame 301. The concave support frame 301 limits and supports the downward movement of the outer support wheel 204. This prevents the pulley frame 202 from continuing to rotate downward, thus providing temporary support for the pulley frame 202 and preventing the pulley frame 202 from falling suddenly.

[0038] Meanwhile, the broken and failed lifting limiter 203 and the fragments generated by the breakage can be received by the receiving mesh frame 303 to avoid safety hazards caused by falling objects from high altitudes.

[0039] It should also be noted that the outer support wheel 204 is covered with a rubber layer on the outside and a steel wheel in the middle. The rubber layer can buffer the impact contact between the outer support wheel 204 and the concave support frame 301.

[0040] Please refer to this carefully. Figures 1-3 The outer support wheel 204 has a central limiting wheel 205 sleeved on the outer side of the pivot of the two pulley frames 202, and the arc surface of the central limiting wheel 205 is tangent to the outer arc surface of the pulley 201.

[0041] In this embodiment, the central limiting wheel 205 can limit and block the groove opening of the pulley 201, so that when the lifting limiter 203 breaks and fails, the pulley frame 202 falls downward and is caught by the concave support frame 301, the wire rope will not fall out of the groove of the pulley 201.

[0042] Please refer to this carefully. Figure 4 The bottom of the groove of the concave support frame 301 is provided with several evenly distributed drainage holes 304, which completely penetrate to the bottom of the concave support frame 301.

[0043] In this embodiment, the drainage hole 304 can prevent water from accumulating inside the groove of the concave support frame 301.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A tower crane lifting restraint device, comprising a frame assembly (1) and a lifting restraint assembly (2) consisting of a boom web (101), a first connecting seat (102), a second connecting seat (103), and a third connecting seat (104), wherein the first connecting seat (102), the second connecting seat (103), and the third connecting seat (104) are horizontally distributed and fixed to the lower surface of the boom web (101), characterized in that, The lifting limit assembly (2) includes a pulley (201), a pulley frame (202), a weight limiter (203), and an outer support wheel (204); The pulley (201) is rotatably mounted between two pulley frames (202). One end of the two pulley frames (202) is fixedly connected by a fixed cylinder and rotates inside the first connecting seat (102). One end of the weight limiter (203) is rotatably connected to the middle area of ​​the other end of the two pulley frames (202), and the other end of the weight limiter (203) is rotatably connected to the inside of the second connecting seat (103). The outer support wheel (204) is rotatably connected to the two pulley frames (202) on opposite sides and close to the rotatable connection point between the weight limiter (203) and the pulley frame (202); An auxiliary support assembly (3) is provided in the area below the outer support wheel (204) and the weight limiter (203). When the weight limiter (203) breaks and fails, the auxiliary support assembly (3) is used to support the outer support wheel (204) and intercept the fragments generated by the breakage of the weight limiter (203).

2. The tower crane lifting limit device according to claim 1, characterized in that, The auxiliary support assembly (3) includes a concave support frame (301) and an arc-shaped connecting arm (302); Two concave support frames (301) are provided. The two concave support frames (301) are located directly below the two outer support wheels (204), and one end of the two concave support frames (301) is fixedly connected to the boom web (101) through a vertical connecting rod. The concave support frames (301) are used to intercept and support the downward-moving outer support wheels (204). One end of the arc-shaped connecting arm (302) is rotatably connected to the middle of the other end of the two concave support frames (301), and the other end of the arc-shaped connecting arm (302) is rotatably connected to the inner side of the third connecting seat (104). The arc-shaped connecting arm (302) is used to provide tension to the concave support frame (301) to ensure the support strength of the concave support frame (301).

3. The tower crane lifting limit device according to claim 2, characterized in that, The auxiliary support component (3) also includes a receiving frame (303); The arc-shaped connecting arm (302) is distributed in the area below the weight limiter (203), and the receiving mesh frame (303) is symmetrically fixed on both sides of the arc-shaped connecting arm (302). The receiving mesh frame (303) is used to receive and intercept the fragments generated by the breakage of the weight limiter (203).

4. The lifting limit device for a tower crane according to claim 1, characterized in that, The outer support wheel (204) has a central limiting wheel (205) sleeved on the outer side of the shaft, located in the middle position of the two pulley frames (202). The arc surface of the central limiting wheel (205) is tangent to the outer arc surface of the pulley (201).

5. A tower crane lifting limit device according to claim 2, characterized in that, The concave support frame (301) has several evenly distributed drainage holes (304) at the bottom of the groove inner wall, and the drainage holes (304) completely penetrate to the bottom of the concave support frame (301).

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