Safe self-locking device for fly jib and engineering machinery

Abstract

The invention relates to the technical field of hoisting device auxiliary arms, and discloses an auxiliary arm safety self-locking device and engineering machinery, and the auxiliary arm safety self-locking device comprises a telescopic driving structure which comprises a fixed end and a driving end which are used for being rotationally connected with a main arm; the hook is connected with the driving end, a limiting space is formed in the hook, and the limiting space penetrates through one side of the hook to form an inlet and outlet; the limiting structure is rotatably connected with the hook; the elastic piece is connected with the hook and the limiting structure; wherein the limiting structure blocks the inlet and outlet and cannot rotate towards the outside of the hook when being located at the locking position, the limiting structure can rotate to the unlocking position to unlock the inlet and outlet when being subjected to thrust towards the limiting space, and the elastic piece is used for applying elastic force to the limiting structure so that the limiting structure can tend to return to the locking position. In the recycling and unfolding process of the fly jib, if the pin shaft of the fly jib inserting and pulling device is pulled out and the pin shaft of the fly jib connecting fork is not inserted, the fly jib safety self-locking device can hang the fly jib to prevent the fly jib from falling off, so that danger can be avoided.

Description

Technical Field

[0001] This invention relates to the field of lifting device jib technology, specifically to a jib safety self-locking device and engineering machinery. Background Technology

[0002] Cranes are essential mechanical equipment in the construction of infrastructure, wind power, nuclear power, and other industries. The main boom of a crane is its core component, directly affecting its working range, lifting capacity, and flexibility. The jib is an extension of the main boom, enabling higher and farther lifting. In existing technology, when using the jib for lifting, the jib is rotated until the main boom head pin is inserted and fixed, then the pin of the insertion / removal device is removed, and the jib is rotated again to switch to the jib lifting mode. During this process, if the operator is negligent or unfamiliar with the operation and removes the pin of the insertion / removal device before properly securing the main boom head pin, then continuing to operate the telescopic drive to push the jib down the support plate will cause the entire jib to fall, easily leading to a safety accident. Summary of the Invention

[0003] In view of this, embodiments of the present invention provide a safety self-locking device for a secondary boom and engineering machinery to solve the safety problems in the prior art when the secondary boom is deployed.

[0004] In a first aspect, the present invention provides a safety self-locking device for a secondary boom, comprising: a telescopic drive structure including a fixed end for rotatably connecting to the main boom and a drive end opposite to the fixed end; a hook connected to the drive end, the hook forming a limiting space, the limiting space penetrating one side of the hook to form an inlet / outlet; a limiting structure rotatably connected to the hook; and an elastic element connecting the hook and the limiting structure; wherein the limiting structure has an unlocked position and a locked position, the limiting structure blocking the inlet / outlet and preventing rotation outward from the hook in the locked position, the limiting structure rotating to the unlocked position to unlock the inlet / outlet when subjected to a thrust toward the limiting space, and the elastic element applying a spring force to the limiting structure to give the limiting structure a tendency to return to the locked position.

[0005] Beneficial effects: During the recovery and deployment of the auxiliary boom, if the pin of the auxiliary boom insertion and removal device is pulled out and the pin of the auxiliary boom connecting fork is not inserted, the auxiliary boom safety self-locking device will catch the auxiliary boom and prevent it from falling, thus avoiding danger and increasing the safety protection of the bottom.

[0006] In one optional embodiment, the auxiliary arm safety self-locking device includes a first pin and a second pin disposed on the hook. The first pin connects the hook and the limiting structure. The elastic element is sleeved on the second pin. One end of the elastic element abuts against the hook, and the other end of the elastic element abuts against the side of the limiting structure facing the limiting space.

[0007] Beneficial effects: The first and second pins can limit the position of the limiting structure and the elastic element, avoiding limitation failure caused by misalignment of the limiting structure or the elastic element.

[0008] In one optional embodiment, the hook has an internal receiving space that extends through the side of the hook facing the limiting space. The first pin and the second pin pass through the receiving space. A portion of the limiting structure is located within the receiving space and is rotatably connected to the first pin. The other portion of the limiting structure extends out of the receiving space and into the limiting space.

[0009] Beneficial effects: The storage space can accommodate elastic components, etc., which can reduce the overall size of the device.

[0010] In one optional embodiment, the side of the hook facing the limiting space forms a first limiting point and a second limiting point at the through-hole of the receiving space. The first limiting point and the second limiting point are respectively located on opposite sides of the limiting structure along the rotation direction. In the unlocked position, the limiting structure abuts against the first limiting point, and in the locked position, the limiting structure abuts against the second limiting point.

[0011] Beneficial effects: The first and second limit points limit the rotation range of the limiting structure, preventing excessive rotation of the limiting structure and ensuring operational accuracy.

[0012] In one optional embodiment, the limiting structure includes a first guide slope, which is disposed on the side of the limiting structure away from the limiting space, and gradually moves closer to the limiting space in a direction that moves away from the first pin.

[0013] Beneficial effects: The first guide ramp can convert the axial impact force of the pin into the rotational force of the limiting structure, reduce the rigid collision between the auxiliary arm and the limiting structure, avoid deformation of both due to impact, and ensure a smooth connection process.

[0014] In one optional embodiment, the hook includes a second guide ramp, which is disposed on the side of the limiting structure away from the limiting space, and is disposed closer to the limiting space in a direction that gradually approaches the first pin.

[0015] Beneficial effects: The second guide ramp can avoid rigid contact between devices, and achieve flexible docking through ramp sliding, reducing frictional loss between the two and extending the service life of the devices.

[0016] In one optional embodiment, the auxiliary arm safety self-locking device further includes an unlocking drive component adapted to drive the limiting structure to move from the locked position to the unlocked position.

[0017] Beneficial effects: Only when the auxiliary boom safety self-locking device is in the safe state of the auxiliary boom connecting fork pin being properly inserted can the unlocking drive component be used to unlock it. If the auxiliary boom connecting fork pin is not properly inserted, the auxiliary boom will fall, and the auxiliary boom pin will press down on the limiting structure. At this time, the auxiliary boom safety self-locking device cannot be unlocked manually. The unlocking drive component operated manually can avoid the risk of the auxiliary boom falling due to incorrect operation or negligence.

[0018] In one alternative embodiment, the unlocking drive component includes a pushing structure that acts on the side of the limiting structure away from the limiting space;

[0019] Alternatively, the unlocking drive component may include the pull structure, which acts on the side of the limiting structure near the limiting space.

[0020] Beneficial effects: Both the pushing and pulling structures act directly on the limiting structure to achieve unlocking. There are no complex electronic control components; unlocking is achieved solely through mechanical transmission. The failure rate is low, and even if damaged, it can be quickly replaced, reducing maintenance costs and downtime.

[0021] Secondly, the present invention also provides an engineering machine, comprising: a main boom; a secondary boom located on one side of the main boom; and the aforementioned secondary boom safety self-locking device, wherein the fixed end of the telescopic drive structure is rotatably connected to the main boom, in the unlocked position, a portion of the secondary boom is adapted to move into or out of the limiting space, and in the locked position, a portion of the secondary boom is located in the limiting space, and the limiting structure blocks the secondary boom.

[0022] In one optional embodiment, the main arm includes a mounting plate, the fixed end of the telescopic drive structure is rotatably connected to the mounting plate, the mounting plate includes an extension spaced apart from the telescopic drive structure, and a limit member is provided on the side of the extension facing the telescopic drive structure.

[0023] Beneficial effects: The main boom only needs to be connected to the telescopic drive structure through the mounting plate, without the need for major modifications to the main boom and auxiliary boom structures. It can be directly adapted to existing cranes, reducing the cost of equipment upgrades and mass production, and facilitating technology promotion. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the structure of the auxiliary arm safety self-locking device of the present invention is shown;

[0026] Figure 2 It shows Figure 1 The diagram shows a cross-sectional view of the auxiliary boom safety self-locking device at the hook.

[0027] Figure 3 It shows Figure 1 A schematic diagram of the hook structure of the safety self-locking device for the mid-arm boom;

[0028] Figure 4 It shows Figure 3 A schematic diagram of the hook from another angle is shown;

[0029] Figure 5 It shows Figure 1 A schematic diagram of the limiting structure of the safety self-locking device for the mid-arm boom;

[0030] Figure 6 It shows Figure 5 A schematic diagram of the limiting structure from another angle;

[0031] Figure 7 It shows Figure 1 A schematic diagram showing the status of the hook lock pin of the auxiliary boom safety self-locking device;

[0032] Figure 8 It shows Figure 1 Schematic diagram of the second state of the hook lock pin of the auxiliary boom safety self-locking device;

[0033] Figure 9 It shows Figure 1 A schematic diagram showing the state of the hook lock pin of the auxiliary boom safety self-locking device;

[0034] Figure 10 It shows Figure 1 Schematic diagram of the status of the hook lock pin of the auxiliary boom safety self-locking device;

[0035] Figure 11 It shows Figure 1 A schematic diagram of the head structure of the mid-arm's safety self-locking device in the locked state;

[0036] Figure 12 A schematic diagram of the pushing structure in the unlocking drive component of the present invention is shown;

[0037] Figure 13 A schematic diagram of the unlocking process of the pull structure in the unlocking drive component of the present invention is shown;

[0038] Figure 14 A schematic diagram of the structure of an engineering machine according to an embodiment of the present invention is shown;

[0039] Figure 15 It shows Figure 14 A schematic diagram of the retracted arm of a medium-sized construction machine.

[0040] Figure 16 It shows Figure 14 A structural diagram illustrating the deployment process of the auxiliary boom in a Chinese engineering machine.

[0041] Figure 17 It shows Figure 14 Schematic diagram of the connection structure of the safety self-locking device between the main boom and auxiliary boom of Chinese construction machinery;

[0042] Figure 18 It shows Figure 14 A schematic diagram of the connection root of the safety self-locking device between the main boom and auxiliary boom of a Chinese construction machinery.

[0043] Explanation of reference numerals in the attached figures:

[0044] 11. Telescopic drive structure; 111. Fixed end; 112. Drive end; 12. Hook; 121. Limiting space; 1211. Inlet / outlet; 122. Accommodation space; 123. First limiting point; 124. Second limiting point; 125. Second guide slope; 126. Hook hole; 13. Limiting structure; 131. First guide slope; 132. Actuating column; 14. Elastic element; 15. First pin; 16. Second pin; 17. Unlocking drive Moving parts; 171, Pushing structure; 1711, Straight rod; 1712, U-shaped rod; 17121, Rod groove; 172, Pulling structure; 10, Auxiliary boom safety self-locking device; 20, Main boom; 21, Mounting plate; 211, Extension; 2111, Limiting component; 22, Main boom head pin hole; 30, Auxiliary boom; 31, Auxiliary boom pin; 32, Auxiliary boom insertion / removal device pin; 33, Auxiliary boom connecting fork pin; 34, Auxiliary boom head pin hole; 100, Construction machinery. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] The following is combined with Figures 1 to 18 The following describes embodiments of the present invention.

[0047] According to an embodiment of the present invention, in one aspect, a safety self-locking device 10 for a secondary arm is provided, such as... Figure 1 and Figure 11 As shown, it includes: a telescopic drive structure 11, including a fixed end 111 for rotatably connecting the main arm and a drive end 112 opposite to the fixed end 111; a hook 12 connected to the drive end 112, the hook 12 forming a limiting space 121, the limiting space 121 penetrating one side of the hook 12 to form an inlet / outlet 1211; a limiting structure 13 rotatably connected to the hook 12; and an elastic member 14 connecting the hook 12 and the limiting structure 13; wherein the limiting structure 13 has an unlocked position and a locked position, the limiting structure 13 blocks the inlet / outlet 1211 and cannot rotate outward from the hook 12 when in the locked position, the limiting structure 13 can rotate to the unlocked position and unlock the inlet / outlet 1211 when subjected to a pushing force toward the limiting space 121, and the elastic member 14 is used to apply a spring force to the limiting structure 13 so that the limiting structure 13 tends to return to the locked position.

[0048] Applying the auxiliary arm safety self-locking device 10 of this embodiment, such as Figures 7 to 10As shown, the telescopic drive structure 11 extends, and under the abutment of the auxiliary arm pin 31, the limiting structure 13 rotates clockwise, causing the limiting structure 13 to remove its obstruction of the inlet / outlet 1211. The auxiliary arm pin 31 enters the limiting space 121. After the hook 12 engages the auxiliary arm pin 31 (i.e., after the auxiliary arm pin 31 has moved into place in the limiting space 121), the limiting structure 13 rotates counterclockwise to reset under its own weight and the elastic force of the elastic element 14, thus blocking the inlet / outlet 1211 and locking the auxiliary arm pin 31. At this time, without using external force to drive (push open from below or pull open from above) the limiting structure 13, the auxiliary arm pin 31 will not be able to disengage from the hook 12. The elastic element 14 can use its elasticity to limit the rotation angle of the limiting structure 13, realizing the automatic switching between unlocked and locked states of the limiting structure 13. If the pin 32 of the auxiliary boom insertion and withdrawal device is pulled out during the recovery and deployment of the auxiliary boom 30, and the pin 33 of the auxiliary boom connecting fork is not inserted, the auxiliary boom safety self-locking device 10 will hold the auxiliary boom 30 to prevent it from falling, thus avoiding danger and increasing the safety protection of the bottom.

[0049] It is worth noting that in related technologies, the device for fixing the auxiliary arm 30 uses a fixed hook and a movable hook. The auxiliary arm 30 is fixed by manually rotating the movable hook to create a confined space between the fixed hook and the movable hook. This device requires two operations to hook and unhook the auxiliary arm 30, which is cumbersome. If an operational error occurs, the auxiliary arm 30 may fall, causing personal injury or death. In this embodiment, however, when the auxiliary arm 30 is retracted and deployed, the auxiliary arm safety self-locking device 10 automatically controls the auxiliary arm 30 within the confined space 121, thus avoiding accidents caused by operational errors.

[0050] In one embodiment, such as Figure 1 and Figure 2 As shown, the auxiliary arm safety self-locking device 10 includes a first pin 15 and a second pin 16 disposed on the hook 12. The first pin 15 connects the hook 12 and the limiting structure 13. The elastic element 14 is sleeved on the second pin 16. One end of the elastic element 14 abuts against the hook 12, and the other end of the elastic element 14 abuts against the side of the limiting structure 13 facing the limiting space 121. With this configuration, the first pin 15 and the second pin 16 can restrict the position of the limiting structure 13 and the elastic element 14, preventing the limiting structure 13 or the elastic element 14 from misaligning and causing limiting failure.

[0051] It is worth noting that the first pin 15 and the second pin 16 are set in parallel.

[0052] Specifically, in one embodiment, the elastic element 14 is a torsion spring.

[0053] In one embodiment, such as Figure 3 and Figure 4 As shown, the hook 12 has an internal receiving space 122 that extends through the side of the hook 12 facing the limiting space 121. The first pin 15 and the second pin 16 pass through the receiving space 122. A portion of the limiting structure 13 is located within the receiving space 122 and is rotatably connected to the first pin 15. The other portion of the limiting structure 13 extends out of the receiving space 122 and into the limiting space 121. With this configuration, the receiving space 122 can accommodate components such as the elastic element 14, reducing the overall size of the device.

[0054] It is worth noting that in one embodiment, the receiving space 122 not only extends through the side of the hook 12 facing the limiting space 121, but also extends through the side of the hook 12 away from the limiting space 121. This arrangement makes it easier to set up the receiving space 122 and cooperate with components such as the limiting structure 13.

[0055] Furthermore, in this embodiment, the side of the hook 12 facing the limiting space 121 forms a first limiting point 123 and a second limiting point 124 at the through-hole of the receiving space 122. The first limiting point 123 and the second limiting point 124 are respectively disposed on opposite sides of the limiting structure 13 along the rotation direction. In the unlocked position, the limiting structure 13 abuts against the first limiting point 123, and in the locked position, the limiting structure 13 abuts against the second limiting point 124. With this arrangement, the first limiting point 123 and the second limiting point 124 can limit the rotation range of the limiting structure 13, avoid excessive rotation of the limiting structure 13, ensure operational accuracy, and when the limiting structure 13 abuts against the second limiting point 124, the limiting structure 13 can be stably locked, improving the reliability of the locking of the auxiliary boom safety self-locking device 10 to the auxiliary boom pin 31 in this embodiment.

[0056] In one embodiment, such as Figure 5 and Figure 6 As shown, the limiting structure 13 includes a first guide slope 131, which is disposed on the side of the limiting structure 13 away from the limiting space 121. In a direction gradually moving away from the first pin 15, the first guide slope 131 gradually approaches the limiting space 121. The first guide slope 131 can convert the axial impact force of the auxiliary arm pin 31 into the rotational force of the limiting structure 13, reducing the rigid collision between the auxiliary arm pin 31 and the limiting structure 13, preventing deformation of both due to impact, and ensuring smooth engagement.

[0057] Furthermore, in one embodiment, such as Figure 3 and Figure 4As shown, the hook 12 includes a second guide slope 125, which is disposed on the side of the limiting structure 13 away from the limiting space 121. In a direction gradually approaching the first pin 15, the second guide slope 125 gradually approaches the limiting space 121. The second guide slope 125 avoids rigid contact between components, achieving flexible docking through slope sliding, reducing frictional loss and extending the service life of the components.

[0058] It is worth noting that the second guide slope 125 can form a guide channel together with the first guide slope 131, so that the auxiliary arm pin 31 moves along the prescribed route.

[0059] In one embodiment, the auxiliary boom safety self-locking device 10 further includes an unlocking drive component 17, which is adapted to drive the limiting structure 13 from the locked position to the unlocked position. The unlocking drive component 17 is manually operated. Only when the auxiliary boom safety self-locking device 10 is in the safe state of the auxiliary boom connecting fork pin 33 being properly inserted can the unlocking drive component 17 be used to unlock it. If the auxiliary boom connecting fork pin 33 is not properly inserted, the auxiliary boom 30 will fall, and the auxiliary boom pin 31 will press against the limiting structure 13. At this time, the auxiliary boom safety self-locking device 10 cannot be unlocked manually. The manually operated unlocking drive component 17 can avoid the risk of the auxiliary boom 30 falling due to incorrect operation or negligence.

[0060] Furthermore, in one embodiment, the unlocking drive component 17 includes a pushing structure 171 that acts on the side of the limiting structure 13 away from the limiting space 121. The pushing structure 171 applies an upward force to the limiting structure 13 from below, causing the limiting structure 13 to rotate clockwise around the first pin 15, thus completing the transfer of the auxiliary arm safety self-locking device 10 from the locked position to the unlocked position and removing its obstruction of the auxiliary arm pin 31 at the inlet / outlet 1211.

[0061] Specifically, in one embodiment, such as Figure 12 As shown, the pushing structure 171 includes a straight rod 1711 and a U-shaped rod 1712. A rod groove 17121 is formed at the end of the U-shaped rod 1712 away from the straight rod 1711. A lever-operating column 132 protrudes from the side of the limiting structure 13, located near the end of the limiting structure 13 away from the first pin 15. When the pushing structure 171 is used to push the limiting structure 13 upwards, the rod groove 17121 engages with the lever-operating column 132. Force is applied to the lever-operating column 132 by the pushing structure 171, causing the limiting structure 13 to rotate clockwise around the first pin 15, thus unlocking the auxiliary arm pin 31.

[0062] In another embodiment, the unlocking drive component 17 includes a pulling structure 172 that acts on the side of the limiting structure 13 near the limiting space 121. The pulling structure 172 applies an upward force to the limiting structure 13, causing the limiting structure 13 to rotate clockwise around the first pin 15, thus completing the transfer of the auxiliary arm safety self-locking device 10 from the locked position to the unlocked position and removing its obstruction of the auxiliary arm pin 31 at the inlet / outlet 1211.

[0063] Specifically, in this embodiment, such as Figure 13 As shown, the pulling structure 172 is a cable. One end of the cable is attached to the limiting structure 13, passes through the receiving space 122, and then through the hook hole 126. It is wrapped around the side of the hook 12 away from the limiting space 121. Pulling the cable causes the limiting structure 13 to rotate clockwise around the first pin 15, thus unlocking the auxiliary arm pin 31.

[0064] It is worth noting that both the pushing structure 171 and the pulling structure 172 act directly on the limiting structure 13 to achieve unlocking. There are no complex electronic control components. Unlocking is achieved only through mechanical transmission, resulting in a low failure rate. Even if damaged, it can be quickly replaced, reducing maintenance costs and downtime.

[0065] According to an embodiment of the present invention, in another aspect, an engineering machinery 100 is also provided, including: a main boom 20; a secondary boom 30 located on one side of the main boom 20; the fixed end of the telescopic drive structure 11 is rotatably connected to the main boom 20, wherein in the unlocked position, a portion of the secondary boom 30 is adapted to move into or out of the limiting space 121, and in the locked position, a portion of the secondary boom 30 is located in the limiting space 121, and the limiting structure 13 blocks the secondary boom 30.

[0066] It is worth noting that the auxiliary arm 30 includes an auxiliary arm pin 31. In the unlocked position, the auxiliary arm pin 31 moves out of the limiting space 121. In the locked position, the auxiliary arm pin 31 is located in the limiting space 121, ensuring that the auxiliary arm 30 does not fall off.

[0067] In one embodiment, such as Figure 18 As shown, the main boom 20 includes a mounting plate 21. The fixed end of the telescopic drive structure 11 is rotatably connected to the mounting plate 21. The mounting plate 21 includes an extension 211 spaced apart from the telescopic drive structure 11. A limiting member 2111 is provided on the side of the extension 211 facing the telescopic drive structure 11. With this configuration, the limiting member 2111 can limit the downward rotation angle of the telescopic drive structure 11, improving the safety of the telescopic drive structure 11 during operation.

[0068] The engineering machinery 100 used in this embodiment, such as Figure 15 and Figure 16As shown, when the auxiliary boom 30 needs to be deployed, the auxiliary boom 30 rotates around the auxiliary boom insertion and removal device pin 32 under the action of the telescopic drive structure 11 until the auxiliary boom head pin hole 34 is aligned with the main boom head pin hole 22. Then, the auxiliary boom fork pin 33 is inserted into the aligned auxiliary boom head pin hole 34 and the main boom head pin hole 22 for fixation. At this time, the auxiliary boom safety self-locking device 10 has fixed the auxiliary boom 30. After removing the auxiliary boom insertion and removal device pin 32, the auxiliary boom safety self-locking device 10 is unlocked using the unlocking drive component 17, and then the auxiliary boom 30 is rotated to the lifting condition state.

[0069] If, during the recovery and deployment of the auxiliary boom 30, the auxiliary boom fork pin 33 is not yet inserted before the auxiliary boom insertion / removal device pin 32 is pulled out, the auxiliary boom safety self-locking device 10 will hold the auxiliary boom 30 to prevent it from falling, thus avoiding danger and increasing bottoming safety protection.

[0070] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A safety self-locking device for a secondary boom, characterized in that, include: The telescopic drive structure (11) includes a fixed end (111) for rotatably connecting the main arm and a drive end (112) opposite to the fixed end (111); A hook (12) is connected to the drive end (112). The hook (12) forms a limiting space (121). The limiting space (121) extends through one side of the hook (12) to form an inlet and outlet (1211). The limiting structure (13) is rotatably connected to the hook (12); An elastic element (14) connects the hook (12) and the limiting structure (13); The limiting structure (13) has an unlocked position and a locked position. When the limiting structure (13) is in the locked position, it blocks the inlet and outlet (1211) and cannot rotate outward from the hook (12). When the limiting structure (13) is subjected to a thrust toward the limiting space (121), it can rotate to the unlocked position and unlock the inlet and outlet (1211). The elastic member (14) is used to apply elastic force to the limiting structure (13) so that the limiting structure (13) has a tendency to return to the locked position.

2. The auxiliary boom safety self-locking device according to claim 1, characterized in that, The auxiliary arm safety self-locking device (10) includes a first pin (15) and a second pin (16) disposed on the hook (12). The first pin (15) connects the hook (12) and the limiting structure (13). The elastic element (14) is sleeved on the second pin (16). One end of the elastic element (14) abuts against the hook (12), and the other end of the elastic element (14) abuts against the side of the limiting structure (13) facing the limiting space (121).

3. The auxiliary boom safety self-locking device according to claim 2, characterized in that, The hook (12) has an internal receiving space (122) that extends through the side of the hook (12) facing the limiting space (121). The first pin (15) and the second pin (16) pass through the receiving space (122). A portion of the limiting structure (13) is located within the receiving space (122) and is rotatably connected to the first pin (15). The other portion of the limiting structure (13) extends out of the receiving space (122) and into the limiting space (121).

4. The auxiliary boom safety self-locking device according to claim 3, characterized in that, The side of the hook (12) facing the limiting space (121) forms a first limiting point (123) and a second limiting point (124) at the through-hole of the receiving space (122). The first limiting point (123) and the second limiting point (124) are respectively located on opposite sides of the limiting structure (13) along the rotation direction. In the unlocked position, the limiting structure (13) abuts against the first limiting point (123). In the locked position, the limiting structure (13) abuts against the second limiting point (124).

5. The auxiliary boom safety self-locking device according to any one of claims 2 to 4, characterized in that, The limiting structure (13) includes a first guide slope (131), which is disposed on the side of the limiting structure (13) away from the limiting space (121). In the direction of gradually moving away from the first pin (15), the first guide slope (131) is disposed closer to the limiting space (121).

6. The auxiliary boom safety self-locking device according to any one of claims 2 to 4, characterized in that, The hook (12) includes a second guide slope (125), which is disposed on the side of the hook (12) away from the limiting space (121). In the direction of gradually approaching the first pin (15), the second guide slope (125) is disposed closer to the limiting space (121).

7. The auxiliary boom safety self-locking device according to any one of claims 1 to 4, characterized in that, The auxiliary arm safety self-locking device (10) further includes an unlocking drive component (17), which is adapted to drive the limiting structure (13) to move from the locked position to the unlocked position.

8. The auxiliary boom safety self-locking device according to claim 7, characterized in that, The unlocking drive component (17) includes a push structure (171) that acts on the side of the limiting structure (13) away from the limiting space (121); Alternatively, the unlocking drive component (17) may include a pull structure (172) that acts on the side of the limiting structure (13) near the limiting space (121).

9. An engineering machinery, characterized in that, include: Main arm (20); A secondary arm (30) is located on one side of the main arm (20); The auxiliary arm safety self-locking device (10) according to any one of claims 1 to 8, wherein the fixed end of the telescopic drive structure (11) is rotatably connected to the main arm (20), in the unlocked position, a portion of the auxiliary arm (30) is adapted to move into or out of the limiting space (121), and in the locked position, a portion of the auxiliary arm (30) is located in the limiting space (121), and the limiting structure (13) blocks the auxiliary arm (30).

10. The engineering machinery according to claim 9, characterized in that, The main arm (20) includes a mounting plate (21), and the fixed end of the telescopic drive structure (11) is rotatably connected to the mounting plate (21). The mounting plate (21) includes an extension (211) spaced apart from the telescopic drive structure (11), and a limit member (2111) is provided on the side of the extension (211) facing the telescopic drive structure (11).

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