A quick locking device for belly-mounted auxiliary arm

Abstract

The present application relates to a kind of belly formula auxiliary arm quick locking device, including main hoist arm, fixed support, swing bracket, hook, auxiliary arm, cam mechanism, U bolt and B type clamp.Fixed support is fixedly installed in the side of main hoist arm, swing bracket is movably installed on fixed support by pin shaft, cam support is fixedly installed on swing bracket, cam handle is movably installed on cam support by pin shaft, U bolt is movably installed on the end of cam handle by pin shaft, and hook is fixedly installed on auxiliary arm.By swinging cam handle, U bolt is hooked on hook, and the locking of auxiliary arm is realized using the cam self-locking characteristics of tightening cam handle;Reverse swing cam handle realizes unlocking.The present application realizes the quick locking and unlocking of auxiliary arm, and is easy and fast to operate, avoids the problems of poor position accuracy and difficult insertion and extraction existing in traditional pin shaft fixation, greatly improves the disassembly and assembly efficiency of auxiliary arm.

Description

Technical Field

[0001] This invention relates to the field of crane auxiliary devices, specifically to a belly-mounted quick-locking device for crane jib, used to achieve quick locking and unlocking operations for crane jib. Background Technology

[0002] A belly-mounted jib is a commonly used accessory for cranes, primarily used to extend the boom, thereby increasing lifting height and distance. In practice, the belly-mounted jib requires on-site installation each time it is used; when not in use, it is fixed to the side of the boom.

[0003] Currently, the traditional method for securing a belly-mounted jib is to use pins at both the front and rear positions. While this method is convenient for disassembly, it also has significant drawbacks. When the crane experiences bumps during long-distance transport, the jib can tilt due to gravity and vibration. To ensure the stability of the jib during transport, an additional securing point is needed. However, adding another pin fixing point in this situation will inevitably affect the efficiency of jib assembly and disassembly, increasing the workload of the operators.

[0004] Traditional pin fixing methods also have the following technical problems: (1) The positional accuracy between the pin and the pin hole is poor. In actual assembly, the pin hole often cannot be aligned, and repeated adjustments are required to complete the installation; (2) The surface roughness of the pin is difficult to guarantee, making insertion and removal difficult and operation not smooth; (3) The pin is prone to wear and corrosion during long-term use, which further exacerbates the assembly difficulties.

[0005] Patent application CN201922022340.5 discloses a crane jib installation device, including a main boom, a jib, and ball joint supports. The jib is mounted on one side of the main boom, and a fixing plate is bolted to the top of the main boom. Ball joint supports are bolted to both sides of the jib. A tie rod is connected to the ball joint inside the ball joint support, and a locking nut is threaded onto the tie rod. The advantages are: when raising the jib, the locking nut can fix the tie rod and the fixing plate together, forming a triangular structure between the jib, the fixing plate, and the tie rod. This provides stable support for the jib's raising process, prevents the jib from rotating to the sides, and improves the safety of the jib's raising process. By setting a sliding seat and a rotating shaft, the second pin joint can be adjusted arbitrarily in the horizontal direction to align with the first pin joint. By inserting a pin into the pin hole, a quick connection between the main boom and the jib is achieved.

[0006] However, the crane boom installation equipment in the aforementioned patented technology cannot solve the defects in the existing technology, nor does it provide any technical inspiration for solving the existing problems. In response to the problems in the existing technology, there is an urgent need for a device that can quickly lock and unlock the boom to replace the traditional pin-shaft fixing method, which would greatly improve the assembly and disassembly efficiency of the boom while ensuring locking reliability. Summary of the Invention

[0007] The purpose of this invention is to provide a belly-mounted auxiliary arm quick-locking device to solve the problems mentioned in the background art above:

[0008] This invention addresses the problems of low assembly and disassembly efficiency, difficult operation, and high positional accuracy requirements associated with the pin-fixed auxiliary boom in existing technologies, and enables rapid locking and unlocking of the auxiliary boom.

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] A quick-locking device for a belly-mounted auxiliary arm;

[0011] Includes a fixed bracket, a swing bracket, a hook, a cam mechanism, and U-bolts;

[0012] The fixed bracket is fixedly installed on the side of the main boom of the crane, and one end of the swing bracket is hinged to the fixed bracket.

[0013] The cam mechanism includes a cam support, a cam handle, a first pin, a second pin, and two connecting plates on both sides. The cam support is fixedly installed on the other end of the swing bracket. One side of the two connecting plates is hinged to the cam support through the first pin, and the other side of the two connecting plates is hinged to the cam handle through the second pin. The cam surface of the cam handle can cooperate with the cam surface of the cam support. U-bolts are provided on the cam mechanism.

[0014] The hook is fixedly installed on the auxiliary boom of the crane and can be used with a U-bolt.

[0015] Based on the above technical solution, the present invention can be further improved as follows.

[0016] Furthermore, two limiting plates are fixedly connected to the side wall of the swing bracket near the fixed bracket, and there is a gap between the two limiting plates to accommodate the end of the cam handle.

[0017] Furthermore, it also includes a B-type clamp, with limit through holes on the two limit plates, which can be engaged with the limit through holes of the two limit plates.

[0018] Furthermore, the range of the active stroke angle of the cam handle is from 0 degrees to 90 degrees.

[0019] Furthermore, the U-bolt is made of high-strength alloy steel.

[0020] Furthermore, the area where the hook mates with the U-bolt is provided with a transition fillet.

[0021] Furthermore, the cam handle is provided with an anti-slip grip.

[0022] The beneficial effects of this abdominal-mounted auxiliary arm quick-locking device are:

[0023] (1) It realizes the quick locking and unlocking function of the auxiliary arm, which is simple and quick to operate, greatly improves the disassembly and assembly efficiency of the auxiliary arm, and saves operation time;

[0024] (2) A cam mechanism is used instead of the traditional pin fixing method. The self-locking characteristic of the cam is used to achieve reliable locking, avoiding the problems of poor pin position accuracy and misalignment of pin holes.

[0025] (3) The swivel operation of the cam handle is more effortless and smoother than the traditional pin insertion and removal operation, avoiding the problem of insertion and removal difficulties caused by poor pin surface roughness;

[0026] (4) The U-bolt hook connection method is easy to position, has low technical requirements for operators, and is suitable for rapid assembly in various working environments;

[0027] (5) The overall structure is compact and reasonable, without adding extra weight and volume to the jib, and without affecting the overall performance of the crane. Attached Figure Description

[0028] Figure 1 This is a front view of the usage state of this embodiment of the abdominal-mounted auxiliary arm quick-locking device.

[0029] Figure 2 yes Figure 1 Sectional view along AA.

[0030] Figure 3 This is a top view of the usage state of this embodiment of the belly-mounted auxiliary arm quick-locking device.

[0031] Figure 4 yes Figure 3 Enlarged view of section B, showing the quick-locking device of the centrally located auxiliary arm in the disengaged state.

[0032] Figure 5 yes Figure 3 Enlarged view of section B, showing the mid-section auxiliary arm quick-locking device in the locked state.

[0033] Figure 6 This is a schematic diagram of the swing bracket in an embodiment of the abdominal-mounted auxiliary arm quick-locking device.

[0034] Figure 7This is a schematic diagram of the structure of the cam handle, the first pin, the second pin, and the connecting plate in an embodiment of the abdominal-mounted auxiliary arm quick-locking device.

[0035] Explanation of the labels in the diagram:

[0036] Fixed bracket - 100; Swing bracket - 200; Limiting plate - 210; Limiting through hole - 211; Third pin - 220; Type B clamp - 300; Cam support - 410; Cam handle - 420; First pin - 430; Second pin - 440; Connecting plate - 450; U-bolt - 500; Hook - 600; Main lifting boom - 710; Auxiliary boom - 720. Detailed Implementation

[0037] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] The terms “vertical,” “horizontal,” “left,” “right,” and similar expressions used in this document are for illustrative purposes only and do not represent the only possible implementation.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] Please refer to Figure 1 to Figure 7 .

[0041] This abdominal-mounted auxiliary arm quick-locking device includes a fixed bracket 100, a swing bracket 200, a hook 600, a cam mechanism, a B-type clamp 300, and a U-bolt 500.

[0042] The main boom 710 of the crane is the core load-bearing component of the crane. The fixed bracket 100 is welded and fixed to the side of the main boom 710 of the crane, providing the installation base for the entire locking device. The fixed bracket 100 is made of high-strength steel, and its main function is to serve as the installation base and support structure for the swing bracket 200.

[0043] One end of the swing bracket 200 is movably hinged to the fixed bracket 100 via a third pin 220. Two limiting plates 210 are welded and fixed to the side wall of the swing bracket 200 near the fixed bracket 100. A gap exists between the two limiting plates 210 to accommodate the end of the cam handle 420. Limiting through holes 211 are respectively opened on the two limiting plates 210. The swing angle range of the swing bracket 200 is determined according to the actual design. The design of the swing bracket 200 should ensure sufficient strength and stability to withstand the weight of the cam mechanism and the auxiliary arm 720, as well as various loads during operation.

[0044] The B-type clamp 300 can be engaged with the limiting through holes 211 of the two limiting plates 210. The B-type clamp 300 is a standard clamping component with the characteristics of simple structure, reliable clamping and convenient disassembly.

[0045] The cam mechanism includes a cam support 410, a cam handle 420, a first pin 430, a second pin 440, and two connecting plates 450 on both sides. The cam support 410 is fixedly installed on the other end of the swing bracket 200. One side of the two connecting plates 450 is hinged to the cam support 410 through the first pin 430, and the other side of the two connecting plates 450 is hinged to the cam handle 420 through the second pin 440. The cam surface of the cam handle 420 can cooperate with the cam surface of the cam support 410. The range of the active stroke angle of the cam handle 420 is 0 degrees to 90 degrees. The cam mechanism uses the geometric characteristics of the cam surface to achieve a self-locking function. When the cam handle 420 swings to the locking position, the cam surface and the relevant contact surface produce a wedging effect, and reliable locking is achieved by using the friction self-locking principle. The cam handle 420 is provided with an anti-slip grip.

[0046] The U-bolt 500 is made of high-strength alloy steel, possessing excellent strength and toughness. Its rated load capacity meets the anti-bump requirements of the auxiliary boom 720 during transportation. The U-bolt 500 is mounted on the second pin 440 of the cam mechanism via multiple nuts. The dimensions of the U-bolt 500 precisely match those of the hook 600, ensuring the reliability and stability of the hook attachment.

[0047] The hook 600 is fixed to the crane jib 720 by welding, and the connection strength should meet the usage requirements. A rounded transition area is provided at the mating point between the hook 600 and the U-bolt 500 to reduce stress concentration and improve service life.

[0048] In use, first remove the B-type clamps 300 from the two limiting plates 210. After the auxiliary arm 720 is retracted to the transport position, rotate the cam handle 420 to hook the U-bolt 500 onto the hook 600. Then tighten the cam handle 420 and use the self-locking characteristic of the cam mechanism to lock the auxiliary arm 720. At this time, the end of the cam handle 420 is in the gap between the two limiting plates 210. Then insert the B-type clamps 300 into the limiting holes of the two limiting plates 210.

[0049] Conversely, by loosening and reversing the cam handle 420, the U-bolt 500 is disengaged from the hook 600, thereby unlocking the auxiliary arm 720.

[0050] Compared with existing technologies, this belly-mounted auxiliary arm quick-locking device has the following technical advantages:

[0051] (1) Traditional pin fixing methods require operators to accurately align the pin holes, and inserting or removing the pins often requires considerable force, and the operation is prone to difficulties due to pin corrosion or deformation. The present invention uses the swing operation of the cam handle 420 and the hook connection of the U-bolt 500. The operation process is simple and intuitive, does not require precise alignment, reduces the technical requirements for operators, and greatly improves the disassembly and assembly efficiency of the auxiliary arm 720.

[0052] (2) Traditional pin fixing methods require high pin hole position accuracy. In actual assembly, the pin holes often do not align, requiring repeated adjustments to complete the installation. This invention uses a U-bolt 500 hook connection method, which allows for a certain positional deviation. The U-bolt 500 can be easily hooked onto the hook 600, greatly reducing the positional accuracy requirements.

[0053] (3) The traditional pin insertion and removal operation requires overcoming the friction between the pin and the pin hole. When the pin surface roughness is poor or there is rust, the operation is more difficult. The present invention adopts the self-locking principle of the cam mechanism, which automatically maintains the locked state without the need to continuously apply external force; when unlocking, it is only necessary to rotate the cam handle 420, which requires little operating force and is easy and smooth.

[0054] (4) The self-locking characteristic of the cam mechanism enables it to resist external vibrations and bumps in the locked state. Even if there are severe bumps during long-distance transportation, it can maintain a reliable locked state and prevent the auxiliary arm 720 from tilting due to gravity. At the same time, the hook connection between the U-bolt 500 and the hook 600 has a large safety margin and high locking reliability.

[0055] During installation and commissioning, first, the fixed bracket 100 should be installed on the side of the main lifting boom 710. The fixed bracket 100 can be fixed by welding or bolting. During installation, ensure the perpendicularity and positional accuracy of the fixed bracket 100 to the main lifting boom 710 to ensure accurate installation references for subsequent components. Next, install the swing bracket 200 onto the fixed bracket 100 via the third pin 220. During installation, ensure flexible swing without jamming. A lubrication structure should be provided between the swing bracket 200 and the fixed bracket 100 to reduce rotational friction.

[0056] The cam mechanism is fixedly mounted on the swing bracket 200. Then, the cam handle 420 is mounted on the cam support 410 via the first pin 430. Finally, the U-bolt 500 is mounted on the end of the cam handle 420 via the second pin 440. During installation, the clearance between each pin should be adjusted to ensure flexible movement. The hook 600 is fixedly mounted on the auxiliary arm 720, and the position of the hook 600 should precisely correspond to the hooking position of the U-bolt 500. After installation, a simulated hooking test should be performed to confirm that the U-bolt 500 can smoothly hook onto the hook 600.

[0057] After installation, the following tests and inspections should be conducted: whether the swing bracket 200 swings smoothly and flexibly; whether the cam handle 420 swings flexibly and reliably and whether its self-locking is reliable; whether the U-bolt 500 and hook 600 hook smoothly and reliably; and whether the stability of the auxiliary arm 720 in the overall locked state meets the requirements.

[0058] The above description is only one embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the principle of the present invention, and these should also be considered to fall within the protection scope of the present invention.

Claims

1. A belly-mounted auxiliary arm quick-locking device, characterized in that: Includes a fixed bracket (100), a swing bracket (200), a hook (600), a cam mechanism, and a U-bolt (500); The fixed bracket (100) is fixedly installed on the side of the main lifting arm (710) of the crane, and one end of the swing bracket (200) is hinged to the fixed bracket (100); The cam mechanism includes a cam support (410), a cam handle (420), a first pin (430), a second pin (440), and two connecting plates (450). The cam support (410) is fixedly installed on the other end of the swing bracket (200). One side of the two connecting plates (450) is hinged to the cam support (410) through the first pin (430), and the other side of the two connecting plates (450) is hinged to the cam handle (420) through the second pin (440). The cam surface of the cam handle (420) can cooperate with the cam surface of the cam support (410). U-bolts (500) are provided on the cam mechanism. The hook (600) is fixedly installed on the auxiliary boom (720) of the crane, and the hook (600) can be used with the U-bolt (500).

2. The quick-locking device for a belly-mounted auxiliary arm according to claim 1, characterized in that: Two limiting plates (210) are fixedly connected to the side wall of the swing bracket (200) near the fixed bracket (100), and there is a gap between the two limiting plates (210) to accommodate the end of the cam handle (420).

3. The quick-locking device for a belly-mounted auxiliary arm according to claim 2, characterized in that: It also includes a B-type clamp (300), with limit through holes (211) on the two limit plates (210) respectively, and the B-type clamp (300) can cooperate with the limit through holes (211) of the two limit plates (210).

4. The quick-locking device for a belly-mounted auxiliary arm according to claim 1, characterized in that: The range of the active stroke angle of the cam handle (420) is 0 degrees to 90 degrees.

5. The quick-locking device for a belly-mounted auxiliary arm according to claim 1, characterized in that: The U-bolt (500) is made of high-strength alloy steel.

6. The quick-locking device for a belly-mounted auxiliary arm according to claim 1, characterized in that: The hook (600) and the U-bolt (500) are provided with a transition fillet.

7. The quick-locking device for a belly-mounted auxiliary arm according to claim 1, characterized in that: The cam handle (420) is provided with an anti-slip grip.

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