A boom retraction centering lock

Abstract

The utility model provides a kind of retracting centering locking device of boom, including first arm head and second arm head, the first arm head is provided with centering assembly between second arm head, the centering assembly includes a group of guide blocks welded on the upper surface of first arm head, the outer surface of each guide block is fixedly connected with tongue, the front and rear sides of each tongue are provided with positioning plate, the top end of each positioning plate is connected with the bottom surface of second arm head, the spacing of each positioning plate is the gradual morphism of upper narrow lower wide, the upper surface of each tongue is provided with connecting groove. The device is provided with centering assembly, tongue can be inserted into the narrowest area between positioning plate, so as to complete the transverse centering positioning of basic arm and two-section arm, connecting block is inserted into connecting groove, the centering and locking action in the whole boom retracting process is completed, effectively avoid the swing or deviation of boom under retracting state.

Description

Technical Field

[0001] This utility model relates to the field of crane technology, and in particular to a boom retraction centering locking device. Background Technology

[0002] The boom is an important component of a crane. Through its flexible extension and luffing capabilities, it enables the vertical lifting and horizontal transport of heavy objects. In actual operation, the boom length can be adjusted according to construction needs. In conjunction with the hook and wire rope, it can lift heavy objects to a specific height to complete complex tasks such as transporting building materials in high-rise buildings and hoisting bridge components. At the same time, its luffing capability can change the working radius, allowing the crane to precisely control the landing point of heavy objects in a limited space. Furthermore, the structural strength of the boom directly determines the rated lifting capacity of the crane. High-strength alloy steel material and optimized mechanical design ensure stability when hoisting heavy equipment, preventing deformation and breakage.

[0003] After a hydraulic truck crane finishes lifting work, when the boom retracts from its extended position to its fully retracted position (when the telescopic cylinder is fully retracted), the spacing between the boom sections often becomes inconsistent. This results in different positioning blocks being added to each section head, which is aesthetically unappealing. Furthermore, due to the varying lateral clearances between sections during retraction, a centering guide device is necessary. However, these devices are currently arranged separately, which is both unsightly and space-consuming. To address this, we provide a boom retraction centering locking device. Utility Model Content

[0004] This utility model provides a boom retraction centering locking device, which solves the problem that when a boom changes from an extended state to a fully retracted state (when the telescopic cylinder is retracted to the bottom), the spacing between the heads of each boom section is often inconsistent, which requires different positioning blocks to be added to the heads of each section, resulting in a very unsightly appearance. Furthermore, due to the different lateral gaps between the sections during retraction, a centering guide device is required during retraction, but currently these are all arranged separately, which is both unsightly and space-consuming.

[0005] The purpose and effect of this utility model of a boom retraction centering locking device are achieved by the following specific technical means: A boom retraction centering locking device includes a first boom head and a second boom head. A centering component is provided between the first boom head and the second boom head. The centering component includes a set of guide blocks welded to the upper surface of the first boom head. A tongue is fixedly connected to the outer surface of each guide block. Positioning plates are provided on the front and rear sides of each tongue. The top of each positioning plate is connected to the bottom surface of the second boom head. The spacing of each set of positioning plates is a gradually changing shape with a narrower top and a wider bottom.

[0006] Preferably, each of the tongues has a connecting groove on its upper surface, a connecting block is inserted into the interior of each connecting groove, and the top of each connecting block is connected to the bottom surface of the second arm head.

[0007] Preferably, each of the positioning plates in each group has a reinforcing plate fixedly connected to one side away from the other, and the other end of each reinforcing plate is connected to the bottom surface of the second arm head.

[0008] Preferably, a set of first blocks are fixedly connected to the bottom surface of the second arm head, and a set of second blocks are fixedly connected to the upper surface of the first arm head.

[0009] Preferably, one side of the bottom end of each first stop and one side of the top end of each second stop are both arc-shaped.

[0010] Preferably, two sets of symmetrically arranged positioning blocks are fixedly connected to the upper surface of the first arm head, and the upper surface of each positioning block is in contact with the bottom surface of the second arm head.

[0011] Preferably, the tip of each of the tongues is semi-circular.

[0012] Beneficial effects:

[0013] 1. By using the centering component, the tongue can be inserted into the narrowest area between the positioning plates to complete the lateral centering and positioning of the main boom and the second boom. At the same time, the connecting block will be inserted into the connecting slot to complete the centering and locking action during the entire boom retraction process, effectively preventing the boom from swaying or deviating in the retracted state.

[0014] 2. By cooperating with the first and second stops, when the two-section boom is retracted, the first stop will fit against the outside of the second stop, ensuring a tight and stable state between the main boom and the two-section boom. The positioning block further enhances the stability of the boom after retraction. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model.

[0016] Figure 2 This is an exploded structural diagram of the centering component of this utility model.

[0017] Figure 3 This is a three-dimensional structural diagram of the second arm head of this utility model.

[0018] Figure 4 This is a three-dimensional structural diagram of the first arm head of this utility model.

[0019] Figure 1-4 In the diagram, the correspondence between component names and drawing numbers is as follows:

[0020] 1. First arm head; 2. Second arm head; 3. Centering assembly; 301. Guide block; 302. Tongue; 303. Positioning plate; 304. Connecting groove; 305. Connecting block; 306. Reinforcing plate; 4. First stop block; 5. Second stop block; 6. Positioning block. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0022] As attached Figure 1 Appendix Figure 3 With appendix Figure 4 As shown: A boom retraction centering locking device includes a first boom head 1 and a second boom head 2. A set of first blocks 4 are fixedly connected to the bottom surface of the second boom head 2, and a set of second blocks 5 are fixedly connected to the upper surface of the first boom head 1. When the second boom head 2 is retracted by the second boom section, the first blocks 4 will descend synchronously and gradually move to the outside of the second blocks 5 and fit against the outside of the second blocks 5, further improving the tight and stable state of the basic boom and the second boom section. One side of the bottom end of each first block 4 and one side of the top end of each second block 5 are arc-shaped. By setting the first blocks 4 and the second blocks 5 to arc shape, when the first blocks 4 descends, they can automatically correct their position along the arc trajectory of the second blocks 5, guiding the first blocks 4 to slide into the positioning accurately, ensuring that the boom always maintains accurate positioning and stable connection during frequent extension and retraction operations, and effectively reducing the risk of structural fatigue caused by swaying.

[0023] As attached Figure 1 To be continued Figure 4As shown: A centering assembly 3 is provided between the first arm head 1 and the second arm head 2. The centering assembly 3 includes a set of guide blocks 301 welded to the upper surface of the first arm head 1. Each guide block 301 has a tongue 302 fixedly connected to its outer surface. Each tongue 302 has a positioning plate 303 on its front and rear sides. The top of each positioning plate 303 is connected to the bottom surface of the second arm head 2. The spacing between each set of positioning plates 303 is a gradually changing shape, narrower at the top and wider at the bottom. When the two-section arm drives the second arm head 2 to retract, the positioning plates 303 connected to the bottom surface of the second arm head 2 will gradually move towards the tongues 302. 2. Moving to both sides, during the movement, the space between the positioning plates 303, which is narrow at the top and wide at the bottom, will form a guiding constraint on the tongue 302. As the second arm head 2 drives the positioning plates 303 to move inward continuously, the tongue 302 will accurately fall into the narrowest area between the positioning plates 303. At this time, the two are closely fitted to achieve lateral centering and positioning. The top of each tongue 302 is semi-circular. By setting the tongue 302 to be semi-circular, the frictional resistance with the positioning plates 303 can be reduced during contraction to avoid scratch damage. After centering is completed, a surface contact force mode can be formed to make the lateral load evenly distributed.

[0024] As attached Figure 2 As shown: Each group of positioning plates 303 has a reinforcing plate 306 fixedly connected to one of their opposite sides. The other end of each reinforcing plate 306 is connected to the bottom surface of the second boom head 2. The reinforcing plate 306 can enhance the firmness of the connection between the positioning plate 303 and the second boom head 2, resist the impact force generated by the alignment of the positioning plate 303 and the tongue 302, and suppress the slight deformation of the connection part, ensuring that the positioning plate 303 always maintains a precise guiding angle. Its unique inclined support structure allows the positioning force between the positioning plate 303 and the tongue 302 to be evenly transmitted to the second boom head 2, further enhancing the firmness of the positioning of the positioning plate 303 and the tongue 302, effectively avoiding alignment deviation caused by loose connection, and providing a reliable guarantee for the stable operation of the boom.

[0025] As attached Figure 2 As shown: Each tongue 302 has a connecting groove 304 on its upper surface. A connecting block 305 is inserted into the interior of each connecting groove 304. The top of each connecting block 305 is connected to the bottom surface of the second boom head 2. When the tongue 302 is inside the positioning plate 303, the connecting block 305 fixed to the bottom surface of the second boom head 2 will be inserted into the connecting groove 304 on the upper surface of the tongue 302 under the guidance, completing the centering and locking action during the entire boom retraction process, effectively preventing the boom from swaying or deviating in the retracted state.

[0026] As attached Figure 1 With appendix Figure 4As shown: Two sets of symmetrically arranged positioning blocks 6 are fixedly connected to the upper surface of the first arm head 1. The upper surface of each positioning block 6 is in contact with the bottom surface of the second arm head 2. The positioning blocks 6 can support the second arm head 2, bear the load of the two-section arm, form a stable multi-point support structure, and enable the two-section arm to maintain a high degree of stability in the retracted state.

[0027] Working principle: First, the first boom head 1 is installed at the head of the crane's basic boom. Then, the second boom head 2 is installed at the head of the second boom section in the same way. For subsequent multi-section booms, boom heads of different sizes can be installed sequentially. When the second boom section drives the second boom head 2 to retract, the positioning plate 303 connected to the bottom surface of the second boom head 2 will gradually move to both sides of the tongue 302. During the movement, the space between the positioning plates 303, which is narrower at the top and wider at the bottom, will form a guiding constraint on the tongue 302. As the second boom head 2 drives the positioning plates 303 to continue to move inward, the tongue 302 will accurately fall into the narrowest area between the positioning plates 303. At this time, the two are tightly fitted, achieving lateral centering and positioning. At the same time, the connecting block 305 fixed to the bottom surface of the second boom head 2 will be inserted into the connecting groove 304 on the upper surface of the tongue 302 under the guidance, completing the centering and locking action during the entire boom retraction process, effectively preventing the boom from swaying or deviating in the retracted state.

Claims

1. A boom retraction centering locking device, comprising a first boom head (1) and a second boom head (2), characterized in that: A centering component (3) is provided between the first arm head (1) and the second arm head (2). The centering component (3) includes a set of guide blocks (301) welded to the upper surface of the first arm head (1). Each guide block (301) has a tongue (302) fixedly connected to its outer surface. Each tongue (302) has a positioning plate (303) on its front and rear sides. The top of each positioning plate (303) is connected to the bottom surface of the second arm head (2). The spacing of each set of positioning plates (303) is a gradual shape that is narrower at the top and wider at the bottom.

2. The boom retraction centering locking device according to claim 1, characterized in that: Each tongue (302) has a connecting groove (304) on its upper surface, and a connecting block (305) is inserted into the interior of each connecting groove (304). The top of each connecting block (305) is connected to the bottom surface of the second arm head (2).

3. The boom retraction centering locking device according to claim 1, characterized in that: Each of the positioning plates (303) is fixedly connected to a reinforcing plate (306) on one side away from each other, and the other end of each reinforcing plate (306) is connected to the bottom surface of the second arm head (2).

4. The boom retraction centering locking device according to claim 1, characterized in that: A set of first blocks (4) are fixedly connected to the bottom surface of the second arm head (2), and a set of second blocks (5) are fixedly connected to the upper surface of the first arm head (1).

5. The boom retraction centering locking device according to claim 4, characterized in that: One side of the bottom of each of the first blocks (4) and one side of the top of each of the second blocks (5) are both arc-shaped.

6. The boom retraction centering locking device according to claim 1, characterized in that: Two sets of symmetrically arranged positioning blocks (6) are fixedly connected to the upper surface of the first arm head (1), and the upper surface of each positioning block (6) is in contact with the bottom surface of the second arm head (2).

7. The boom retraction centering locking device according to claim 1, characterized in that: The tip of each of the tongues (302) is semi-circular.

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