Hoisting accessory and engineering machine

Abstract

The application relates to the technical field of hoisting fittings, and discloses a hoisting fitting and engineering machinery, which are provided with an unhooking structure, the unhooking structure comprises a shell provided with a vertical sliding groove, a lifting hook comprising a hook portion, a hinged portion and a swing portion, the hinged portion being hinged to the shell, a self-locking connecting rod, a first end of the self-locking connecting rod being hinged in the vertical sliding groove and being capable of moving up and down along the vertical sliding groove, a second end of the self-locking connecting rod being hinged to the swing portion, an elastic member, the elastic member being connected to the first end of the self-locking connecting rod, so as to apply a downward force to the second end of the self-locking connecting rod, and the hinged point between the second end of the self-locking connecting rod and the swing portion, the hinged point between the hinged portion and the shell and the vertical center line of the vertical sliding groove being capable of being located on the same plumb line when the hoisting fitting is suspended, so that the unhooking structure has a mechanical dead point position. The hoisting fitting and the engineering machinery realize the purpose of improving operation safety by setting the unhooking structure to perform automatic unhooking operation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of hoisting accessories, and particularly relates to a hoisting accessory and engineering machinery. BACKGROUND

[0002] A telescopic forklift is a multifunctional engineering machinery device widely used in the fields of construction, logistics, energy, and port. In order to adapt to various complex working conditions, the telescopic forklift is usually equipped with various accessories to complete hoisting, carrying, loading and unloading, etc. Among them, the hoisting accessory is one of the most common functional accessories, which is mainly used for lifting and transferring materials. However, when hoisting, the existing hook accessory usually needs manual participation in hooking and unhooking operations. The operator needs to leave the cab to manually complete hooking, then returns to the cab to perform hoisting, and then leaves the cab again to manually complete unhooking. During the hoisting operation, the operator needs to approach the hoisting area or enter the working range of the hoisting equipment to complete the hooking and unhooking operations, which increases the risk of the operator being injured by falling objects or mechanical misoperation, especially when hoisting large heavy objects or dangerous goods, the safety hazard is more obvious. SUMMARY

[0003] The purpose of the present application is to provide a hoisting accessory and engineering machinery to achieve the purpose of improving the safety of operation.

[0004] In order to achieve the above purpose, the present application provides a hoisting accessory having an unhooking structure, which comprises:

[0005] a housing provided with a vertical sliding groove extending in the vertical direction;

[0006] a hook comprising a hook portion, a hinge portion and a swing portion connected in sequence from bottom to top, the hinge portion being hinged to the housing;

[0007] a self-locking link, a first end of the self-locking link being hinged in the vertical sliding groove and being capable of moving up and down along the vertical sliding groove, a second end of the self-locking link being hinged to the swing portion;

[0008] a resilient member, a first end of the resilient member being connected to the housing, a second end of the resilient member being connected to the first end of the self-locking link, for applying a downward force to the second end of the self-locking link;

[0009] wherein the hinge point between the second end of the self-locking link and the swing portion, the hinge point between the hinge portion and the housing, and the vertical center line of the vertical sliding groove can be located on the same plumb line when the hoisting accessory is suspended, so that the hook has a mechanical dead point position, and the resilient member can drive the first end of the self-locking link to move downward along the vertical sliding groove when the hook is located at a non-mechanical dead point position.

[0010] In some embodiments, the lower end of the shell extends downward and is formed with an anti-disengagement portion which is buckled on the hook opening of the hook portion to form a closed lifting ring structure when the disengagement structure is at the mechanical dead point position.

[0011] In some embodiments, a first limiting member is arranged on the anti-disengagement portion, and the outer peripheral wall of the terminal hook head of the hook portion is in abutment with the first limiting member when the disengagement structure is at the mechanical dead point position.

[0012] In some embodiments, a second limiting member is arranged on the shell, and the hook portion is located between the anti-disengagement portion and the second limiting member, and the hook opening of the hook portion is arranged horizontally or slightly upwardly when the outer peripheral wall of the upper end hook body of the hook portion is in abutment with the second limiting member.

[0013] In some embodiments, the shell further comprises a lifting portion above the vertical sliding slot.

[0014] In some embodiments, the lifting accessory further comprises:

[0015] a main body frame, one end of the main body frame being provided with an interface structure for connecting with the engineering machinery;

[0016] a disengagement buckle, the upper end of the disengagement buckle being hingedly connected with the main body frame, and the lower end of the disengagement buckle being connected with the lifting portion.

[0017] In some embodiments, the lifting portion comprises a lifting hole buckled with the lower end of the disengagement buckle, the center line of the lifting hole, the center line of the hinge rotation shaft between the upper end of the disengagement buckle and the main body frame, the center line of the hinge rotation shaft between the first end of the self-locking connecting rod and the vertical sliding slot, the center line of the hinge rotation shaft between the second end of the self-locking connecting rod and the swinging portion, and the center line of the hinge rotation shaft between the hinge portion and the shell are parallel to each other.

[0018] In some embodiments, the shell further comprises a main body portion connected below the lifting portion, the main body portion comprising two shell side walls arranged at intervals and a clamping cavity clamped between the two shell side walls, the self-locking connecting rod, the elastic member, the hinge portion and the swinging portion being respectively accommodated in the clamping cavity, the two shell side walls being respectively provided with the vertical sliding slot in position, the self-locking connecting rod being hingedly connected with the two vertical sliding slots through sliding rod shafts, and the hinge portion being hingedly connected with the two shell side walls through hook rotation shafts.

[0019] In some specific embodiments, the elastic member is a spring, the first end of the elastic member is hinged to the shell, the second end of the elastic member is hinged to the first end of the self-locking link, and the hinge point between the first end of the elastic member and the shell is located below the hinge point between the second end of the elastic member and the first end of the self-locking link.

[0020] A second aspect of the present application provides an engineering machine, which includes the above-mentioned lifting accessories.

[0021] With the above technical solution, when preparing to lift a heavy object, the lifting attachment can be swung, causing the hook to rotate relative to the housing. The self-locking link, under the action of the elastic member, can release the unhooking structure from its mechanical dead point position, unlocking it. When the hook is hooked onto the object and lifted, the weight of the object causes the unhooking structure to return to its mechanical dead point position, locking it. Furthermore, when it is necessary to release the object, the lifting attachment can be swung, causing the hook to rotate relative to the housing. The self-locking link, under the action of the elastic member, can release the unhooking structure from its mechanical dead point position, unlocking it, allowing the hook to reach the unhooking position for the object, thereby achieving automatic unhooking. This eliminates the need for manual unhooking, improving the efficiency of the telescopic forklift during lifting operations, reducing the safety risks associated with manual intervention, and enhancing the safety and ease of operation of the equipment. Furthermore, the automatic unhooking structure of this lifting attachment is based on mechanical principles, avoiding the use of complex electrical or hydraulic systems, reducing manufacturing costs and maintenance.

[0022] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without inventive work. In the drawings:

[0024] Figure 1 A schematic diagram of the installation of a lifting attachment and a telescopic forklift arm head according to a specific embodiment of the present application is shown;

[0025] Figure 2 for Figure 1 Exploded diagram of the installation structure of the lifting attachment and the telescopic forklift arm head;

[0026] Figure 3 for Figure 1 A cross-sectional view of the lifting attachment in FIG, wherein the unhooking structure is located at the mechanical dead point;

[0027] Figure 4 Fig. 2 is a sectional view of the lifting accessory in Fig. 1, wherein the unhooking structure is located at a non-mechanical dead point position. Figure 1

[0028] Reference signs

[0029] 1 main frame 11 interface structure

[0030] 12 shackle hole 2 shackle

[0031] 21 shackle screw 3 shell

[0032] 31 vertical sliding groove 32 anti-disengagement part

[0033] 33 first limiting part 34 second limiting part

[0034] 35 lifting hole 4 hook

[0035] 5 self-locking connecting rod 6 elastic member

[0036] 7 spring fixing shaft 8 sliding rod shaft

[0037] 9 connecting rod rotating shaft 10 hook rotating shaft

[0038] 100 arm head quick-change connecting device DETAILED DESCRIPTION

[0039] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0040] The telescopic forklift is usually designed for single-person operation. The traditional lifting needs additional manual cooperation to complete the unhooking operation when unloading at high altitude. The manual unhooking operation needs additional time, increases the complexity of the operation, greatly limits the operation efficiency of the forklift, and violates the original design intention of the equipment being convenient, efficient and safe.

[0041] ​Therefore, the first aspect of the present application provides a new lifting accessory, which is provided with a hook release structure, the hook release structure comprising a housing 3, a hook 4, a self-locking connecting rod 5 and an elastic member 6. The housing 3 is provided with a vertical sliding groove 31 extending in the vertical direction, the hook 4 comprises a hooking portion, a hinged portion and a swinging portion connected in sequence from bottom to top, and the hinged portion is hinged to the housing 3. The first end of the self-locking connecting rod 5 is hinged in the vertical sliding groove 31 and can move up and down along the vertical sliding groove 31, and the second end of the self-locking connecting rod 5 is hinged to the swinging portion. The first end of the elastic member 6 is connected to the housing 3, and the second end of the elastic member 6 is connected to the first end of the self-locking connecting rod 5, so as to exert a downward force on the second end of the self-locking connecting rod 5. The hinged point between the second end of the self-locking connecting rod 5 and the swinging portion, the hinged point between the hinged portion and the housing 3 and the vertical center line of the vertical sliding groove 31 can be located on the same plumb line when the lifting accessory is suspended, so that the hook release structure has a mechanical dead point position. When the hook release structure is located at a non-mechanical dead point position, the elastic member 6 can drive the first end of the self-locking connecting rod 5 to move downward along the vertical sliding groove 31.

[0042] As shown in Figure 3 and Figure 4 When the lifting accessory is suspended, the vertical center line of the vertical sliding groove 31 is arranged along the vertical line. Due to the guiding effect of the vertical sliding groove 31, the first end of the self-locking connecting rod 5 can only move vertically and linearly along the vertical sliding groove 31. The self-locking connecting rod 5 is in the shape of a straight rod, the first end of the self-locking connecting rod 5 is hinged in the vertical sliding groove 31, that is, the first end of the self-locking connecting rod 5 is rotatably connected to the vertical sliding groove 31, and the second end of the self-locking connecting rod 5 can swing. The hook 4 is in the shape of an inverted question mark, the hinged portion of the hook 4 is hinged to the housing 3 through a hook rotating shaft 10, that is, the hook 4 can rotate around the hinged point between the hinged portion and the housing 3. The swinging portion is located at the upper end of the hook 4 and is hinged to the second end of the self-locking connecting rod 5 through a connecting rod rotating shaft 9.

[0043] When the lifting accessory is suspended, and the vertical center line of the vertical sliding groove 31, the two hinged points of the first end and the second end of the self-locking connecting rod 5, and the two hinged points of the hinged portion and the swinging portion are located on the same plumb line, the hook release structure is located at the mechanical dead point position, at this time, even if the elastic member 6 exerts a downward force on the second end of the self-locking connecting rod 5, the self-locking connecting rod 5 and the hook 4 will not move, that is, the hook release structure is located at the locking state. When the hook 4 swings, the swinging portion drives the second end of the self-locking connecting rod 5 to swing, at this time, the hook release structure deviates from the mechanical dead point position, under the action of the downward force exerted by the elastic member 6, the first end of the self-locking connecting rod 5 moves downward along the vertical sliding groove 31, the second end of the self-locking connecting rod 5 swings accordingly, thereby driving the swinging portion to swing, the hook 4 rotates around the hinged portion, so that the hooking portion of the hook 4 rotates downward, thereby achieving the purpose of automatic unhooking.

[0044] Specifically, as shown in Figure 3 and Figure 4As shown, during the lifting process, the hook sleeve connected with the heavy object is hung on the hook opening of the hook 4 in the unlocked state, and the whole lifting accessory is lifted by the boom. During the lifting of the heavy object, the gravity of the heavy object presses on the hook 4, and under the action of the gravity of the heavy object, the hook 4 rotates counterclockwise around the hook shaft 10, and the swing part of the hook 4 rotates counterclockwise with the counterclockwise rotation of the hook 4, so that the second end of the self-locking link 5 in the unlocked state rotates with the hook 4, and the first end of the self-locking link 5 moves upward along the vertical sliding groove 31, and the gravity can overcome the downward force of the elastic element 6 until the two hinge holes of the self-locking link 5 and the hook 4 are located on the same vertical line, at which time the unhooking structure is in the locked state, and the self-locking link 5 and the hook 4 are locked in position.

[0045] During the unhooking process, the lifting object needs to be released, the boom is operated to swing the whole lifting accessory forward, so that the hook 4 rotates clockwise due to inertia, or the bottom of the hook 4 is lightly touched by the object, so that the hook 4 rotates clockwise. After the hook 4 rotates, the two hinge points of the first end and the second end of the self-locking link 5 are not located on the same vertical line with the hook shaft 10, so that the self-locking link 5 is out of the mechanical dead point, the elastic element 6 pulls the self-locking link 5, so that the self-locking link 5 moves downward along the vertical sliding groove 31 in the housing 3, and the self-locking link 5 pushes the swing part of the hook 4 to rotate clockwise during the downward movement, at which time the hook 4 rotates clockwise around the hook shaft 10, so that the hook opening of the hook 4 rotates downward until the hook unhooking limit position is reached.

[0046] Therefore, the unhooking structure of the lifting accessory is simple, efficient and highly adaptable, and can achieve the purpose of automatic unhooking. Through the setting of the mechanical dead point structure of the elastic element 6 and the self-locking link 5, and the rotation cooperation of the hook 4, the hook 4 can be converted between the working state and the unhooking state, realizing automatic unhooking without manual unhooking. Not only does it improve the efficiency of the telescopic boom loader in the lifting operation, reduces the safety risk of manual participation, but also improves the safety and operation convenience of the equipment. Moreover, the automatic unhooking structure of the lifting accessory is based on mechanical principles, avoiding the use of complex electrical or hydraulic systems, reducing manufacturing costs and maintenance difficulty, and making the lifting accessory suitable for a wide range of lifting operation scenarios.

[0047] It should be noted that the structure of the housing 3 and the elastic element 6 can be various, and can be designed according to the actual application needs or manufacturing cost needs. For example, the housing 3 can be an integral molding or a combination of multiple parts, and the housing 3 can be square, circular or irregular in shape, etc. The elastic element 6 can be a spring or a torsion spring, etc. According to the different positions, the elastic element 6 can apply tensile stress or compressive stress to the self-locking link 5.

[0048] Optionally, as Figure 3 and Figure 4As shown, the middle position between the first end and the second end of the self-locking connecting rod 5 is provided with a spring hanging hole. The elastic member 6 can be a spring, the first end of the elastic member 6 is hinged on the housing 3 through a spring fixing shaft 7, and the second end of the elastic member 6 is hinged on the first end of the self-locking connecting rod 5 through the spring hanging hole. Among them, the hinge point between the first end of the elastic member 6 and the housing 3 is located below the hinge point between the second end of the elastic member 6 and the first end of the self-locking connecting rod 5, at this time the elastic member 6 is in a stretched state, and the self-locking connecting rod 5 is applied downward force by applying tensile stress to the self-locking connecting rod 5.

[0049] Optionally, in order to make the structure of the lifting accessory more stable and reliable, as shown in Figure 1 、 Figure 3 and Figure 4 , the housing 3 can also include a main body portion connected below the lifting portion, the main body portion includes two housing side walls arranged at intervals and a clamping cavity clamped between the two housing side walls, and the self-locking connecting rod 5, the elastic member 6, the hinge portion and the swinging portion are respectively accommodated in the clamping cavity. The two housing side walls are respectively provided with vertical sliding grooves 31, that is, each housing side wall is provided with a vertical sliding groove 31, and the two vertical sliding grooves 31 are arranged in position, and the self-locking connecting rod 5 is hinged with the two vertical sliding grooves 31 through sliding rod shafts 8. Each housing side wall is also provided with a spring hinge hole and a lifting hook hinge hole, and the two spring hinge holes are arranged in position, and the elastic member 6 is hinged on the two housing side walls through the spring fixing shaft 7 and the two spring hinge holes. The hinge portion of the lifting hook 4 is hinged on the two housing side walls through the two lifting hook hinge holes and a lifting hook rotating shaft 10.

[0050] Optionally, as shown in Figure 3 and Figure 4 , the lower end of the housing 3 extends downward and is formed with an anti-falling portion 32, when the unhooking structure is located at the mechanical dead point position, the anti-falling portion 32 is buckled on the hook opening of the hook portion to block at the hook opening of the hook portion and forms a closed lifting ring structure with the hook portion to prevent the article from falling off the lifting hook 4 in the shaking. When the unhooking structure is located at the mechanical dead point position, the lifting hook 4 can rotate away from the anti-falling portion 32, so that the hook opening of the lifting hook 4 can be reopened to facilitate automatic unhooking operation.

[0051] Further, the anti-falling portion 32 is provided with a first limiting member 33, and the outer peripheral wall of the terminal hook head of the hook portion abuts against and is limited by the first limiting member 33 when the unhooking structure is located at the mechanical dead point position. In this way, under the limiting action of the first limiting member 33 on the lifting hook 4, the lifting hook 4 cannot continue to rotate counterclockwise to escape from the mechanical dead point position, and since the hook opening of the lifting hook 4 faces the anti-falling portion 32, the hook opening of the lifting hook 4 cannot continue to rotate upward, thereby avoiding the lifting hook 4 from appearing in a position and orientation that is not conducive to unhooking, and making the unhooking structure more reasonable.

[0052] Further, the shell 3 is provided with a second limiting member 34, the hook portion is located between the anti-disengagement portion 32 and the second limiting member 34, when the upper end of the hook portion abuts on the second limiting member 34, the hook opening of the hook portion is arranged horizontally or slightly upward. In this way, the hook 4 cannot continue to rotate clockwise, and the disengagement structure is more reasonable.

[0053] Optionally, the shell 3 can also include a lifting portion above the vertical sliding groove 31, so that the disengagement structure can be directly hung. Of course, the present application is not limited thereto, and the disengagement structure can also be connected to other structures for hanging.

[0054] Further, the lifting accessory can also include a main frame 1 and a shackle 2, and the disengagement structure can be hung by the main frame 1 and the shackle 2, so as to facilitate swinging of the disengagement structure. Figure 1 and Figure 2 As shown in the drawings, one end of the main frame 1 is provided with an interface structure 11 for connecting with the engineering machinery, the other end of the main frame 1 is provided with a shackle hole 12, the upper end of the shackle 2 is provided with a shackle screw 21, the shackle screw 21 is arranged in the shackle hole 12, so that the upper end of the shackle 2 is hinged with the main frame 1. The lifting portion includes a lifting hole 35, and the lower end of the shackle 2 is connected with the lifting hole 35 of the lifting portion.

[0055] Further, in order to make the swinging action of the disengagement structure more conducive to disengagement, the center line of the lifting hole 35, the hinge shaft center line between the upper end of the shackle 2 and the main frame 1, the hinge shaft center line between the first end of the self-locking connecting rod 5 and the vertical sliding groove 31, the hinge shaft center line between the second end of the self-locking connecting rod 5 and the swinging portion, and the hinge shaft center line between the hinge portion and the shell 3 are parallel to each other.

[0056] The second aspect of the present application provides an engineering machinery, which includes the above-mentioned lifting accessory. Since the engineering machinery includes the above-mentioned lifting accessory, it also has all the technical effects brought by the lifting accessory, and therefore will not be repeated here. The engineering machinery can be a telescopic arm forklift or a forklift boom, etc.

[0057] Optionally, as shown in the drawings, Figure 1 and Figure 2 The engineering machinery is a telescopic arm forklift, the telescopic arm forklift is provided with an arm head quick-change connecting device 100, the interface structure 11 at the rear end of the main frame 1 is detachably connected with the arm head quick-change connecting device 100, so as to realize installation of the lifting accessory on the telescopic arm forklift for lifting operation. It should be noted that the structure principle of the arm head quick-change connecting device 100 is well known to those skilled in the art, and does not belong to the core improvement part of the present application, and therefore will not be repeated here.

[0058] In summary, the hoisting accessory structure is simple and efficient, and has strong adaptability, and can realize automatic unhooking operation, so that the efficiency of the telescopic arm forklift in hoisting operation is improved, the safety risk of manual participation is reduced, and the safety and operation convenience of the equipment are improved.

[0059] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0060] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and other terms should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection or communication with each other; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0062] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A lifting attachment, characterized in that: A decoupling structure is provided, and the decoupling structure comprises: The housing (3) is provided with a vertical slide groove (31) extending in the vertical direction; A hook (4) comprising a hook portion, a hinge portion and a swing portion sequentially connected from bottom to top, wherein the hinge portion is hinged to the housing (3); A self-locking connecting rod (5), wherein a first end of the self-locking connecting rod (5) is hinged in the vertical slide groove (31) and can move up and down along the vertical slide groove (31), and a second end of the self-locking connecting rod (5) is hinged to the swing portion; an elastic member (6), wherein a first end of the elastic member (6) is connected to the housing (3), and a second end of the elastic member (6) is connected to the first end of the self-locking connecting rod (5) for applying a downward force to the second end of the self-locking connecting rod (5); Wherein, the hinge point between the second end of the self-locking link (5) and the swinging part, the hinge point between the hinge part and the shell (3), and the vertical center line of the vertical slide groove (31) can be located on the same plumb line when the lifting attachment is suspended, so that the unhooking structure has a mechanical dead point position, and the elastic member (6) can drive the first end of the self-locking link (5) to move downward along the vertical slide groove (31) when the unhooking structure is located at a non-mechanical dead point position.

2. The lifting attachment according to claim 1, characterized in that: The lower end of the housing (3) extends downward and is formed with an anti-slip portion (32); when the unhooking structure is located at a mechanical dead point, the anti-slip portion (32) is snapped onto the hook opening of the hook portion to form a closed hanging ring structure with the hook portion.

3. The lifting attachment according to claim 2, characterized in that: The anti-slip portion (32) is provided with a first limiting member (33), and when the unhooking structure is located at a mechanical dead point, the outer peripheral wall of the end hook head of the bent hook portion abuts against the first limiting member (33) for limiting position.

4. The lifting attachment according to claim 2, characterized in that: A second limiting member (34) is provided on the housing (3), and the hook portion is located between the anti-slip portion (32) and the second limiting member (34). When the outer peripheral wall of the upper end hook body of the hook portion abuts against the second limiting member (34), the hook mouth of the hook portion is arranged in a transverse direction.

5. The lifting attachment according to claim 1, characterized in that: The housing (3) further comprises a hoisting portion located above the vertical slide groove (31).

6. The lifting attachment according to claim 5, characterized in that: The lifting accessories also include: A main frame (1), one end of the main frame (1) being provided with an interface structure for connection with engineering machinery; A shackle (2), wherein the upper end of the shackle (2) is hinged to the main frame (1), and the lower end of the shackle (2) is connected to the hoisting part.

7. The lifting attachment according to claim 6, characterized in that: The hoisting portion includes a hoisting hole (35) that is buckled with the lower end of the shackle (2), and the center line of the hoisting hole (35), the center line of the hinge axis between the upper end of the shackle (2) and the main frame (1), the center line of the hinge axis between the first end of the self-locking link (5) and the vertical slide groove (31), the center line of the hinge axis between the second end of the self-locking link (5) and the swinging portion, and the center line of the hinge axis between the hinge portion and the shell (3) are parallel to each other.

8. The lifting attachment according to claim 5, characterized in that: The shell (3) also includes a main body connected below the lifting part, the main body includes two shell side walls arranged at intervals and a clamping cavity sandwiched between the two shell side walls, the self-locking connecting rod (5), the elastic member (6), the hinge part and the swinging part are respectively accommodated in the clamping cavity, the two shell side walls are respectively provided with the vertical sliding grooves, the self-locking connecting rod (5) is respectively hinged to the two vertical sliding grooves (31) through the sliding rod shaft (8), and the hinge part is respectively hinged to the two shell side walls through the hook rotating shaft (10).

9. The lifting attachment according to claim 1, characterized in that: The elastic member (6) is a spring, the first end of the elastic member (6) is hinged to the housing (3), the second end of the elastic member (6) is hinged to the first end of the self-locking connecting rod (5), and the hinge point between the first end of the elastic member (6) and the housing (3) is located below the hinge point between the second end of the elastic member (6) and the first end of the self-locking connecting rod (5).

10. An engineering machine, characterized in that: The invention comprises a lifting attachment according to any one of claims 1 to 9.

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