Counterweight locking structure and engineering machinery equipment

Abstract

This application relates to the field of engineering machinery and discloses a counterweight locking structure and engineering machinery equipment. The counterweight locking structure includes at least two counterweights, a hook, and a limiting member. The at least two counterweights are stacked sequentially in a vertical direction. Each counterweight has a lifting lug and a first hanging lug, with a first hanging lug hole on the first hanging lug. The hook includes a first end with a circular hole and a second end with a second hanging lug hole. In any two adjacent counterweights, the lifting lug of one counterweight passes through the circular hole at the first end, and the first and second hanging lug holes of the other counterweight are concentric. The limiting member is detachably inserted into the second and first hanging lug holes to lock the adjacent counterweights. By using a simple combination of the hook and the limiting member, the overall structure is lightweight and easy for one person to operate. The detachable limiting member allows for easy simultaneous locking of any adjacent counterweights and flexible adjustment to accommodate any number of counterweights in working conditions.

Description

Technical Field

[0001] This application belongs to the field of engineering machinery technology, specifically relating to a counterweight locking structure and engineering machinery equipment. Background Technology

[0002] In crane equipment, the counterweight system is the core component for balancing the lifting load and ensuring the stable operation of the equipment. Counterweights are usually installed at the rear of the crane turntable in a multi-layer stacked manner. A reliable locking structure is required to prevent them from shifting or overturning during the operation of the equipment, which is crucial to the safety and operational accuracy of the whole machine. At present, the mainstream counterweight locking technology in the industry mainly includes the following three implementation methods: (1) Chain locking structure: A ring chain is used to wrap around the bottom and top lifting lugs of the counterweight stack, and the chain is tightened by a special locking buckle in the chain to achieve fixation; (2) Double lug plate structure: Two sets of double lug plates are welded to the upper and lower ends of the counterweight periphery, and the lugs of the adjacent counterweights are connected and locked longitudinally by a single pull plate and a pin shaft passing through them in sequence; (3) "H-type" pull plate structure: The base and the lifting lug of the top counterweight are directly connected by an H-shaped rigid pull plate, and a rotatable locking bolt is set at the lower end of the pull plate to apply pre-tightening force.

[0003] However, existing locking methods all have significant drawbacks: In chain locking, the metal chain itself is heavy, making it extremely difficult for a single operator to tighten the fasteners and adjust the chain length; when the crane is fitted with a small number of counterweights, redundant chains cannot be effectively stored and hang dangling from the outside of the equipment, affecting aesthetics and posing a safety hazard by hooking onto surrounding objects. The double-ear plate structure requires welding ear plate connectors to the outer surface of the counterweight, resulting in the ear plates protruding significantly beyond the counterweight outline after installation, hindering the overall appearance of the equipment; simultaneously, the multi-stage pin assembly process is cumbersome, and the welding quality directly affects structural strength. The rigid pull plate of the "H-type" pull plate structure is excessively heavy, requiring high physical strength from operators for handling and high-altitude installation; its bottom bolt tightening space is narrow, requiring operators to perform high-torque tightening actions in a confined area, making single-person operation infeasible.

[0004] In summary, existing counterweight locking technologies generally suffer from common defects such as bulky structure, inconvenient operation, poor adaptability, and redundant appearance. There is an urgent need for a new locking solution that is lightweight, easy to operate, and can adapt to the number of counterweights. Utility Model Content

[0005] In view of at least one of the above-mentioned defects or deficiencies in the prior art, this application provides a counterweight locking structure that is simple in structure, easy to operate, and can achieve locking between counterweights while being economical and aesthetically pleasing.

[0006] To achieve the above objectives, this application provides a counterweight locking structure, which includes:

[0007] At least two counterweights are stacked sequentially in the vertical direction. Each counterweight has a lifting lug and a first hanging lug. The first hanging lug has a first hanging lug hole.

[0008] The hook includes a first end with a round hole and a second end with a second lug hole. In any two adjacent counterweights, the lug of one counterweight passes through the first end, and the first lug hole and the second lug hole of the other counterweight are concentric.

[0009] The limiting component is detachably inserted into the second and first hanging ear holes to lock the adjacent counterweights.

[0010] In some embodiments, the counterweight has a groove on its side wall, and the lifting lug is disposed in the groove; the lifting lug includes a connecting part and a stop part, one end of the connecting part is connected to the bottom wall of the groove, and the other end is connected to the stop part, the diameter of the stop part is smaller than the diameter of the circular hole.

[0011] In some embodiments, the counterweight further includes a positioning block connected to the top wall of the counterweight. The positioning block has a first plane, and the first hook is connected to the first plane and extends in a direction perpendicular to the first plane, such that the hook connecting two adjacent counterweights is vertically positioned.

[0012] In some embodiments, the counterweight is provided with a receiving groove for accommodating the positioning block of the lower counterweight among any two adjacent counterweights.

[0013] In some embodiments, the counterweight includes a bottom counterweight and a side counterweight. The upper surface of the bottom counterweight is a planar bearing area, the area of ​​which is larger than the bottom area of ​​the side counterweight. The side counterweights are stacked on the planar bearing area.

[0014] In some embodiments, the planar load-bearing area includes extended load-bearing areas symmetrically arranged at both ends along its length, the extended load-bearing areas being used to place the side counterweights;

[0015] A positioning block is provided on the extended bearing area, and the positioning block is used to position the side counterweight.

[0016] In some embodiments, the hook has two second hook ears, the second hook ear holes are disposed on the two second hook ears, the two second hook ears are arranged side by side with a gap, and the first hook ear is placed between the two second hook ears;

[0017] The second end also has a hollowed-out portion, which is disposed between the two second hooks and is used to accommodate the first hook.

[0018] In some embodiments, the hook also includes a handle, the handle comprising two connecting arms and a horizontal beam connecting the two connecting arms, the two connecting arms being respectively fixed to the hook, the horizontal beam being parallel to and spaced apart from the hook, forming a lifting space between the hook for a person to pass through.

[0019] In some embodiments, the limiting member includes a free end and a limiting end. The diameter of the free end is smaller than the inner diameter of the first and second ear holes, and the diameter of the limiting end is larger than the inner diameter of the first and second ear holes. The first and second ear holes are sleeved on the free end. The free end has a limiting hole for a limiting pin to pass through. The limiting pin passes through the limiting hole to limit the limiting member.

[0020] The second aspect of this application provides an engineering machinery device, including the counterweight locking structure described in any one of the above claims.

[0021] The above technical solution, through a simple combination of hooks and limiting components, results in a lightweight overall structure that is easy for one person to operate. The first end of the hook connects to the lug of a counterweight, while the second end, through a concentric design, aligns the first and second lug holes of another counterweight. A detachable limiting component then secures the connection. This connection method, which has no specific order requirement, allows for easy simultaneous locking of any adjacent counterweights and flexible adjustments to accommodate any number of counterweights. Furthermore, this design fully considers the characteristics of the lugs and hooks, efficiently connecting adjacent counterweights with the hook, reducing redundant components, lowering economic costs, and maintaining a simple and aesthetically pleasing structure.

[0022] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0024] Figure 1 This is a schematic diagram of the counterweight locking structure in this utility model;

[0025] Figure 2 for Figure 1Enlarged view of section A;

[0026] Figure 3 This is a structural diagram of the side counterweight in this utility model;

[0027] Figure 4 This is a structural diagram of the midsole counterweight of this utility model;

[0028] Figure 5 This is a structural diagram of the hook in this utility model;

[0029] Explanation of reference numerals in the attached figures

[0030] Detailed Implementation

[0031] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0032] The present application will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0033] like Figures 1 to 5 As shown, this application provides a counterweight locking structure, including: at least two counterweights 10, a hook 20, and a limiting member 30. The at least two counterweights 10 are stacked sequentially in the vertical direction. Each counterweight 10 has a lug 13 and a first hook 14. The first hook 14 has a first hook hole 14a. The hook 20 includes a first end 21 with a round hole 21a and a second end 22 with a second hook hole 22b. In any two adjacent counterweights 10, the lug 13 of one counterweight 10 passes through the round hole 21a of the first end 21, and the first hook hole 14a and the second hook hole 22b of the other counterweight 10 are concentric. The limiting member 30 is detachably inserted into the second hook hole 22b and the first hook hole 14a to lock the vertically adjacent counterweights 10.

[0034] By employing a simple combination of hook 20 and limiting member 30, the overall structure is lightweight and easy for one person to operate. The first end 21 of hook 20 is connected to the lug 13 of a counterweight 10, while the second end 22 is designed concentrically to align the first lug hole 14a and the second lug hole 22b of another counterweight 10. The detachable limiting member 30 is then inserted and locked in place. This connection method, which does not require a specific order, can easily achieve simultaneous locking of any adjacent counterweights and can flexibly adjust to any number of counterweights in working conditions. At the same time, this design fully considers the characteristics of the lug 13 and the lug, and uses hook 20 to efficiently connect adjacent counterweights 10, reducing redundant parts, which not only reduces economic costs but also maintains a simple and beautiful structure.

[0035] In some implementations, such as Figure 3 As shown, the counterweight 10 has a groove 15 on its side wall 19, and a lifting lug 13 is disposed in the groove 15. The lifting lug 13 includes a connecting part 13a and a stop part 13b. One end of the connecting part 13a is connected to the bottom wall 15a of the groove 15, and the other end is connected to the stop part 13b. The diameter of the connecting part 13a is smaller than the diameter of the circular hole 21a, and the diameter of the stop part 13b also needs to be smaller than the diameter of the circular hole 21a. Simultaneously, the diameter of the connecting part 13a is also smaller than the diameter of the stop part 13b, allowing the hook 20 to flexibly pass through the circular hole 21a through the stop part 13b, fit into the connecting part 13a, and freely rotate and adjust around the connecting part 13a, significantly reducing assembly difficulty. (Reference) Figure 2 The hook 20 is fitted onto the connecting part 13a through the round hole 21a. Since the diameter of the connecting part 13a is smaller than the diameter of the stop part 13b, the hook 20 descends to a certain height. After the hook 20 is inserted, the stop part 13b forms axial and circumferential limits, effectively preventing the hook 20 from accidentally coming off the lug 13 and improving the reliability of the connection. At this time, among the two adjacent counterweights 10, the first lug hole 14a and the second lug hole 22b of the lower counterweight 10 are concentric. The limiting member 30 can be inserted into the second lug hole 22b and the first lug hole 14a to lock the adjacent counterweights 10. Moreover, the lug 13 is set in the groove 15, which optimizes the spatial layout and makes the overall structure more compact and flat. The groove 15 design also has the function of protecting the lug 13, preventing the lug 13 from protruding, bumping, or deforming under force, taking into account both safety and aesthetics. To ensure the stability of the counterweight locking structure, the counterweight 10 can be provided with grooves 15 and lifting lugs 13 on multiple side walls 19. At the same time, multiple positioning blocks 16 and first hanging lugs 14 are provided on the top wall 18 to lock the counterweight 10 on multiple sides.

[0036] In some implementations, reference Figure 3 The counterweight 10 also includes a positioning block 16, which is connected to the top wall 18 of the counterweight 10 via a base. The positioning block 16 is located at the edge of the top wall 18 and has a first plane 16a. The first plane 16a is coplanar with the bottom wall 15a of the groove 15. The first hook 14 is connected to the first plane 16a and extends in a direction perpendicular to the first plane 16a, ensuring that the first hook 14 extends vertically and is aligned with the lifting lug 13. This makes the hook 20 connecting two adjacent counterweights 10 vertically set, eliminating angular deviation and greatly improving the stability and accuracy of locking. At the same time, the edge arrangement facilitates quick alignment and installation, simplifies the assembly process, and achieves efficient operation.

[0037] In some implementations, reference Figure 3The counterweight 10 is provided with a receiving groove 17, which is used to accommodate the positioning block 16 of the lower counterweight 10 in any two adjacent counterweights 10. The receiving groove 17 is located at the lower end of the counterweight 10 and corresponds to the position of the positioning block 16 of the lower counterweight 10. When the upper and lower counterweights 10 are stacked, the receiving groove 17 of the upper counterweight 10 precisely engages with the positioning block 16 of the lower counterweight 10, forming a positioning function, preventing the adjacent counterweights 10 from shifting horizontally, and improving assembly stability. The nested design significantly simplifies the assembly process; only alignment and stacking are required for automatic position calibration, greatly improving locking efficiency. In addition, the positioning block 16 is integrated into the top wall 18, which also optimizes space utilization and reduces additional components.

[0038] In some implementations, reference Figure 3 and Figure 4 The counterweight 10 includes a bottom counterweight 11 and side counterweights 12. The upper surface of the bottom counterweight 11 is a planar bearing area 11a, and the area of ​​the planar bearing area 11a is larger than the bottom area of ​​the side counterweights 12. The side counterweights 12 are stacked on the planar bearing area 11a. By using the upper surface of the bottom counterweight 11 as the planar bearing area 11a, and its area being larger than the bottom area of ​​the side counterweights 12, when the side counterweights 12 are stacked on this planar bearing area 11a, the planar bearing area 11a provides a stable support platform, ensuring that the side counterweights 12 are placed firmly and are not easily overturned.

[0039] In some implementations, reference Figure 1 The planar load-bearing area 11a includes extended load-bearing areas 11b symmetrically arranged at both ends along its length. The extended load-bearing areas 11b are used to place the side counterweights 12. It is understood that both ends of the symmetrically arranged extended load-bearing areas 11b can hold the side counterweights 12, making the force on the bottom counterweight 11 more balanced. Positioning blocks 16 are provided on the extended load-bearing areas 11b. The positioning blocks 16 are used to position the side counterweights 12. It is understood that the positioning blocks 16 on the bottom counterweight 11 and the positioning blocks 16 on the side counterweight 12 have the same structure, but due to the larger area of ​​the planar load-bearing area 11a... The bottom area of ​​the side counterweight 12 is used to position the side counterweight 12 by means of the positioning block 16. Therefore, the positioning block 16 does not need to be set at the edge of the planar bearing area 11a. It only needs to be arranged within the bottom projection range of the side counterweight 12. The position of the positioning block 16 corresponds to the position of the receiving groove 17 at the lower end of the side counterweight 12. When the side counterweight 12 is lowered, its receiving groove 17 will automatically engage with the positioning block 16 to limit the position, which greatly reduces the requirements for processing and assembly accuracy. Even if there is a small installation deviation, the position can be quickly corrected by the engaging guide, which significantly improves the positioning error tolerance rate.

[0040] In some implementations, such as Figure 2 and Figure 5As shown, the hook 20 has two second hook ears 22a, and second hook ear holes 22b are provided on the two second hook ears 22a. It can be understood that each of the two second hook ears 22a has a second hook ear hole 22b, and the two second hook ears 22a are arranged side by side with intervals. Therefore, when the hook is attached to the hanging ear 13, the first hook ear 14 is placed between the two second hook ears 22a. Moreover, the second end 22 of the hook 20 also has a hollow part 22c, which is provided between the two second hook ears 22a to accommodate the first hook ear 14. The two parallel second lugs 22a form a clamping zone, allowing the first lug 14 to be precisely guided into the hollow section 22c when the hook 20 is engaged. Simultaneously, the hollow section 22c provides physical space for the first lug 14, ensuring it is fully embedded between the two second lugs 22a. This forcibly aligns the first lug hole 14a with the two second lug holes 22b, achieving automatic concentric positioning of the three holes and reducing the difficulty of inserting the limiting component 30. The structure of the two second lugs 22a also enhances torsional rigidity, preventing the hook 20 from wobbling; while the hollow design reduces the weight of the hook 20 and provides a visual alignment reference for assembly, resulting in efficient and precise locking.

[0041] In some implementations, such as Figure 5 As shown, the hook 20 also includes a handle 23, which includes two connecting arms 23a and a horizontal beam 23b connected between the two connecting arms 23a. The horizontal beam 23b smoothly transitions to the two connecting arms 23a. The two connecting arms 23a are respectively fixed to the hook 20. The horizontal beam 23b is parallel to the hook 20 and spaced apart, forming a lifting space for a hand to pass through. The width and height of the lifting space are designed to fit the size of a human hand, allowing the operator to directly grip the horizontal beam 23b to install or remove the hook. The handle 23 is located in the middle of the hook 20 in the vertical direction, that is, between the first end 21 and the second end 22, making the hook 20 structure more compact.

[0042] In some implementations, reference Figure 2The limiting member 30 includes a free end 30a and a limiting end 30b. The diameter of the free end 30a is smaller than the inner diameter of the first ear hole 14a and the second ear hole 22b, and the diameter of the limiting end 30b is larger than the inner diameter of the first ear hole 14a and the second ear hole 22b. The first ear hole 14a and the second ear hole 22b are sleeved on the free end 30a. The free end 30a has a limiting hole for the limiting pin 31 to pass through. The limiting pin 31 passes through the limiting hole to limit the limiting member 30. It is understandable that, since the hook 20 has two second hook ears 22a and the first hook ear 14 is placed between the two second hook ears 22a, the free end 30a passes through the concentrically aligned second hook ear hole 22b-first hook ear hole 14a-second hook ear hole 22b in sequence. Since the diameter of the limiting end 30b is larger than the inner diameter of the first hook ear hole 14a and the second hook ear hole 22b, the limiting end 30b abuts against the second hook ear 22a to form an axial jam, preventing the hook 20 from coming off. The limiting hole through the free end 30a, together with the limiting pin 31, forms a further limiting. When the limiting pin 31 is inserted into the limiting hole, the parts of its two ends that extend beyond the body of the limiting member 30 constitute a physical block, completely eliminating the axial displacement of the limiting member 30 in the hole. The limiting component 30 can be a pin with a flange, with the flange serving as the limiting end 30b and the pin body serving as the free end 30a. The limiting pin 31 can be a type B cotter pin. After the pin body passes through multiple lug holes in sequence, the flange abuts against the second lug 22a. At this time, the type B cotter pin is vertically inserted into the limiting hole. Specifically, the straight end of the type B cotter pin is inserted into the limiting hole, and the bent end relies on its own elasticity to tightly adhere to the surface of the free end 30a, preventing the type B cotter pin from loosening and falling off. Moreover, the type B cotter pin can be directly inserted and removed, enabling single-person manual insertion and removal in seconds, making disassembly and assembly more convenient and faster.

[0043] A second aspect of this application provides an engineering machinery device, including the aforementioned counterweight locking structure. The engineering machinery device may be a crane or similar equipment.

[0044] This utility model employs a simple combination of hook 20 and limiting member 30, resulting in a lightweight overall structure that is easy for one person to operate. The first end 21 of the hook 20 connects to the lug 13 of a counterweight 10, while the second end 22, through a concentric design, aligns the first lug hole 14a of another counterweight 10 with its second lug hole 22b. A detachable limiting member 30 then passes through and locks the connection. This connection method, which does not require a specific order, allows for easy simultaneous locking of any adjacent counterweights and flexibly adapts to any number of counterweights in working conditions. Furthermore, this design fully considers the characteristics of the lug 13 and the hook, utilizing the hook 20 to efficiently connect adjacent counterweights 10, reducing redundant components, lowering economic costs, and maintaining a simple and aesthetically pleasing structure.

[0045] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0048] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A counterweight locking structure, characterized in that, The counterweight locking structure includes: At least two counterweights (10) are stacked in the vertical direction. Each counterweight (10) has a lug (13) and a first hanging lug (14). The first hanging lug (14) has a first hanging lug hole (14a). The hook (20) includes a first end (21) with a round hole (21a) and a second end (22) with a second ear hole (22b). In any two adjacent counterweights (10), the lug (13) of one counterweight (10) is inserted through the first end (21), and the first ear hole (14a) and the second ear hole (22b) of the other counterweight (10) are concentric. The limiting member (30) is detachably inserted into the second ear hole (22b) and the first ear hole (14a) to lock the adjacent counterweights (10).

2. The counterweight locking structure according to claim 1, characterized in that, The counterweight (10) has a groove (15) on its side wall (19), and the lifting lug (13) is disposed in the groove (15). The lifting lug (13) includes a connecting part (13a) and a stop part (13b). One end of the connecting part (13a) is connected to the bottom wall (15a) of the groove (15), and the other end is connected to the stop part (13b). The diameter of the stop part (13b) is smaller than the diameter of the circular hole (21a).

3. The counterweight locking structure according to claim 2, characterized in that, The counterweight (10) further includes a positioning block (16), which is connected to the top wall (18) of the counterweight (10). The positioning block (16) has a first plane (16a), and the first hook (14) is connected to the first plane (16a) and extends in a direction perpendicular to the first plane (16a), so that the hook (20) connecting two adjacent counterweights (10) is vertically arranged.

4. The counterweight locking structure according to claim 3, characterized in that, The counterweight (10) is provided with a receiving groove (17), which is used to receive the positioning block (16) of the lower counterweight (10) in any two adjacent counterweights (10).

5. The counterweight locking structure according to any one of claims 1 to 4, characterized in that, The counterweight (10) includes a bottom counterweight (11) and a side counterweight (12). The upper surface of the bottom counterweight (11) is a planar bearing area (11a). The area of ​​the planar bearing area (11a) is larger than the bottom area of ​​the side counterweight (12). The side counterweight (12) is stacked on the planar bearing area (11a).

6. The counterweight locking structure according to claim 5, characterized in that, The planar load-bearing area (11a) includes extended load-bearing areas (11b) symmetrically arranged at both ends along its length direction, and the extended load-bearing areas (11b) are used to place the side counterweight (12). A positioning block (16) is provided on the extended bearing area (11b), and the positioning block (16) is used to position the side counterweight (12).

7. The counterweight locking structure according to any one of claims 1 to 4, characterized in that, The hook (20) has two second hook ears (22a), and the second hook ear holes (22b) are disposed on the two second hook ears (22a). The two second hook ears (22a) are arranged side by side with a gap between them, and the first hook ear (14) is placed between the two second hook ears (22a). The second end (22) also has a hollow part (22c), which is disposed between the two second hooks (22a) for accommodating the first hook (14).

8. The counterweight locking structure according to any one of claims 1 to 4, characterized in that, The hook (20) also includes a handle (23), which includes two connecting arms (23a) and a horizontal beam (23b) connected between the two connecting arms (23a). The two connecting arms (23a) are respectively fixed to the hook (20). The horizontal beam (23b) is parallel to the hook (20) and spaced apart, forming a lifting space between the hook (20) for a person to put their hand through.

9. The counterweight locking structure according to any one of claims 1 to 4, characterized in that, The limiting member (30) includes a free end (30a) and a limiting end (30b). The diameter of the free end (30a) is smaller than the inner diameter of the first ear hole (14a) and the second ear hole (22b). The diameter of the limiting end (30b) is larger than the inner diameter of the first ear hole (14a) and the second ear hole (22b). The first ear hole (14a) and the second ear hole (22b) are sleeved on the free end (30a). The free end (30a) has a limiting hole for the limiting pin (31) to pass through. The limiting pin (31) passes through the limiting hole to limit the limiting member (30).

10. An engineering machinery equipment, characterized in that, Includes the counterweight locking structure as described in any one of claims 1 to 9.

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