Self-balancing type main arm anti-back-tilting structure for crawler crane

Abstract

The utility model discloses a self-balancing type main arm anti-back-tipping structure for a crawler crane, which is characterized in that an anti-over-tipping inhaul cable is arranged between a rotary table and an arm frame of the crawler crane, the inhaul cable is connected with a connecting frame through a balancing pulley, and the connecting frame is connected with a buffer rod. According to the utility model, the backward inclination prevention installation convenience is improved, the safety is improved, and the damage to structural parts when the cantilever crane inclines backwards is reduced.

Description

Technical Field

[0001] The utility model relates to the field of crawler cranes, in particular to a self-balancing main arm anti-backward tilting structure for crawler cranes. Background Art

[0002] GB / T 14560-2022 crawler cranes require that cranes using wire rope luffing should be equipped with devices to prevent the boom, superlift mast, jib mast, etc. from tipping backwards. The device can absorb the impact caused by the sudden release of the load due to a failure of the wire rope or the sling, and prevent the boom or mast from tipping backwards. At present, the main boom anti-tilt mostly adopts the form of an anti-tilt bar. One end of the anti-tilt bar is installed on the bottom arm of the main boom, and the other end is installed on the turntable. The anti-tilt bar can adopt the structure of inner and outer sleeve + spring, or it can adopt the form of a cylinder. When the boom is suddenly unloaded, the anti-tilt bar supports the boom to prevent the boom from tipping backward.

[0003] However, the anti-tilt system of the prior art has the following problems: 1. When the anti-tilt system is in effect, it is mainly subjected to pressure. To ensure the reliability of the anti-tilt system, its compressive stability needs to be considered. The anti-tilt bar is generally large in diameter and heavy in weight. An auxiliary crane is required for installation, which affects the convenience of installation. 2. The anti-tilt bar is connected to the boom at one end and the turntable at the other end. It has high requirements for dimensional accuracy. Affected by the cumulative processing error, the anti-tilt system often acts unilaterally when actually subjected to force, increasing the risk of accidents. 3. When the anti-tilt system is in effect, the vertical component of the force acting on the bottom section of the main arm is large, which can easily cause damage to the bottom section of the arm structure.

[0004] Therefore, it is necessary to develop a new anti-tilt structure to overcome the above problems. Utility Model Content

[0005] Purpose of the utility model: In view of the shortcomings and defects of the prior art, the utility model provides a self-balancing main arm anti-tilt structure for a crawler crane, which improves the convenience of anti-tilt installation, increases safety, and reduces damage to structural parts when the boom tilts backward.

[0006] Technical solution: The utility model discloses a self-balancing main arm anti-tilt backward structure for a crawler crane, which is characterized in that a pull cable for preventing over-tilt is arranged between the turntable and the boom of the crawler crane, the pull cable is connected to a connecting frame through a balancing pulley, and the connecting frame is connected to a buffer rod.

[0007] Wherein, the cable passes through the balance pulley, and both ends of the cable are connected to the arm through connecting ear plates.

[0008] Wherein, the turntable of the crawler crane is provided with a connecting ear plate connected with the buffer rod and the connecting frame.

[0009] Wherein, one end of the buffer rod is hinged to the turntable through a connecting ear plate, and the other end is hinged to the connecting frame through a connecting ear plate.

[0010] Wherein, the buffer rod comprises a core tube, a sleeve and a spring.

[0011] Wherein, a pin is arranged between the core tube and the sleeve.

[0012] Wherein, the connecting frame adopts a single-leaf structure.

[0013] Beneficial effects: Compared with the prior art, the utility model has the following significant advantages: the utility model has a simple structure, high lightness, and convenient installation; the single-leaf structure connecting frame and the balance pulley set are adopted to ensure that the forces on both sides are synchronized, prevent unilateral force, and are safer; when the cable is stressed, the vertical force on the boom is smaller. The utility model improves the convenience of anti-backward tilt installation, increases safety, and reduces damage to structural parts when the boom tilts backward. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the anti-tilt structure of the prior art;

[0015] Figure 2 It is a schematic diagram of the structure of the utility model;

[0016] Figure 3 It is a three-dimensional structural schematic diagram of the utility model;

[0017] Figure 4 It is a structural schematic diagram of the balancing pulley of the utility model;

[0018] Figure 5 It is a structural schematic diagram of the buffer rod of the utility model;

[0019] Figure 6 It is a structural schematic diagram of the connecting frame of the utility model;

[0020] In the figure, 1 is a connecting ear plate; 2 is a cable; 3 is a buffer rod; 4 is a balance pulley; and 5 is a connecting frame. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0022] The crawler crane of the utility model is a crane that installs the lifting operation part on the crawler chassis and moves by the crawler device. Main arm: a component that is hinged with the turntable and used to support the lifting of heavy objects and can be variable in amplitude, including the bottom section arm, the top section arm and the middle section. Anti-tilt: a device to prevent the crane boom from tipping backward during lifting, variable amplitude or working. Turntable: a platform structure used to install the bottom section arm of the main arm, the lifting mechanism, the variable amplitude mechanism, the herringbone frame and other components on the hoist.

[0023] The utility model discloses a self-balancing main arm anti-backward tilt structure for a crawler crane, wherein a cable 2 for preventing over-tilting is arranged between the turntable and the boom of the crawler crane, and the cable 2 is connected to a connecting frame 5 through a balancing pulley 4, and the connecting frame 5 is connected to a buffer rod 3. The cable 2 passes through the balancing pulley 4, and both ends of the cable 2 are connected to the boom through a connecting ear plate 1. The turntable of the crawler crane is provided with a connecting ear plate 1 to connect with the buffer rod 3 and the connecting frame 5. One end of the buffer rod 3 is hinged to the turntable through the connecting ear plate 1, and the other end is hinged to the connecting frame 5 through the connecting ear plate 1. The buffer rod 3 includes a core tube, a sleeve and a spring. A pin is arranged between the core tube and the sleeve. The connecting frame 5 adopts a single-leaf structure.

[0024] like Figure 2-6 The utility model prevents the boom from tipping over when the heavy objects are suddenly unloaded by setting a cable 2 between the turntable and the boom of the crawler crane. When the heavy objects are suddenly unloaded, the boom tilts backward, and the cable 2 gradually straightens and is pulled to prevent the boom from tilting backward; the cable 2 straightens and drives the connecting frame 5 to tilt backward, and the spring of the buffer rod 3 is gradually compressed under pressure, which plays a buffering role in the process of the cable 2 being stressed, preventing the structural parts from being damaged due to sudden stress.

[0025] The turntable is provided with an ear plate for installing the illustrated connecting frame 5 and the buffer rod 3. One end of the buffer rod 3 is hinged to the turntable ear plate, and the other end is connected to the connecting frame 5 ear plate. The buffer rod 3 is provided with a core tube, a sleeve and a spring. The spring is used to absorb the impact caused by the sudden unloading of the heavy object to prevent damage to the structural parts; a pin is provided between the core tube and the sleeve to prevent falling off. The connecting frame 5 adopts a single-leaf structure to ensure that the forces on both sides are consistent, and the buffer rods 3 on both sides work at the same time. A balancing pulley 4 is provided to ensure that the forces on the cables 2 on both sides are balanced.

[0026] The utility model has a simple structure, high lightness and convenient installation. It adopts a single-leaf structural connecting frame and a balancing pulley set to ensure that the forces on both sides are synchronized, preventing unilateral forces, which is safer. When the cable is stressed, the vertical force on the boom is smaller. The utility model improves the convenience of anti-backward tilt installation, increases safety, and reduces damage to structural parts when the boom tilts backward.

Claims

1. A self-balancing main arm anti-tilt structure for a crawler crane, characterized in that: An anti-overturning cable (2) is arranged between a turntable and a boom of a crawler crane. The cable (2) is connected to a connecting frame (5) through a balancing pulley (4), and the connecting frame (5) is connected to a buffer rod (3).

2. The self-balancing main arm anti-backward tilting structure for a crawler crane according to claim 1, characterized in that: The cable (2) passes through the balance pulley (4), and both ends of the cable (2) are connected to the arm frame through connecting ear plates (1).

3. The self-balancing main arm anti-tilt structure for crawler crane according to claim 2, characterized in that: The turntable of the crawler crane is provided with a connecting ear plate (1) connected with a buffer rod (3) and a connecting frame (5).

4. The self-balancing main arm anti-backward tilting structure for a crawler crane according to claim 3, characterized in that: One end of the buffer rod (3) is hinged to the turntable through a connecting ear plate (1), and the other end is hinged to the connecting frame (5) through the connecting ear plate (1).

5. The self-balancing main arm anti-backward tilting structure for a crawler crane according to claim 4, characterized in that: The buffer rod (3) comprises a core tube, a sleeve and a spring.

6. The self-balancing main arm anti-backward tilting structure for a crawler crane according to claim 5, characterized in that: A pin is arranged between the core tube and the sleeve tube.

7. The self-balancing main arm anti-backward tilting structure for a crawler crane according to claim 1, characterized in that: The connecting frame (5) adopts a single-leaf structure.

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