Cargo boom assembly and engineering machinery
By setting up a support structure and a limit hook on the main boom, the problem of the auxiliary boom accidentally falling before the pin is pulled out is solved, and the safety protection of the auxiliary boom during the connection state switching process is realized, which improves the reliability and safety of operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-03-03
- Publication Date
- 2026-04-17
AI Technical Summary
In existing technologies, there is a risk of the auxiliary boom falling before it is fully connected to the end of the main boom after all the pins have been pulled out, which could lead to structural damage and safety hazards.
A support structure is installed on the main boom to provide temporary support before the jib is disengaged. The jib is also secured by a limit hook and a hook-and-hook structure to prevent accidental disengagement during swinging.
It effectively prevents the auxiliary boom from accidentally falling during the connection state switching process, improves the safety and reliability of operation, and reduces the risk of structural damage.
Smart Images
Figure CN121872256A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of lifting equipment technology, specifically to a lifting boom assembly and engineering machinery. Background Technology
[0002] Wheeled cranes are widely used lifting equipment in engineering construction. To meet the needs of high-altitude and long-distance lifting operations, wheeled cranes are usually equipped with a jib structure. In the transport and non-working state, the jib is in the folded storage position, in which the jib is connected to the bracket on the side of the main boom via a first pin. When the jib needs to be used, the operator removes the first pin, then manually unfolds the jib, and connects the end of the jib to the end section of the main boom via two pins, completing the preparation for operation.
[0003] Before storing and using the boom, the pins at different positions must be inserted and removed in a specific order. In actual operation, due to differences in operator experience, complex construction site environment, or tight schedules, operational errors such as incomplete insertion of pins or incorrect insertion / removal sequence are prone to occur. In particular, when all the pins securing the boom to the main boom are pulled out before the boom head is fully connected to the end of the main boom, the boom will detach from the main boom and fall directly from the side of the main boom under its own weight, causing structural damage to the boom, impact deformation of the main boom, and even endangering the personal safety of nearby workers. Summary of the Invention
[0004] In view of the problem in the prior art that the auxiliary boom is at risk of falling after all the pins are pulled out but before it is connected to the end of the main boom, the present invention provides a lifting boom assembly and engineering machinery that can prevent the auxiliary boom from falling accidentally.
[0005] In a first aspect, the present invention provides a lifting boom assembly, comprising: a main boom; a secondary boom having a retracted position, an intermediate position, and an extended position relative to the main boom, one end of which is rotatably and detachably connected to the end of the main boom, allowing the secondary boom to swing relative to the main boom between the extended position and the intermediate position; a connecting structure disposed on one side of the main boom for rotatably and detachably connecting to the secondary boom when the secondary boom is in the intermediate position, allowing the secondary boom to swing relative to the main boom between the retracted position and the intermediate position; and a supporting structure disposed on the main boom for supporting the secondary boom during the swinging of the secondary boom between the retracted position and the intermediate position.
[0006] The lifting boom assembly provided by this invention, when the auxiliary boom is in the retracted position, is connected to the main boom via a connecting structure. Simultaneously, the auxiliary boom is fully retracted to the side of the main boom, with the support structure abutting against it. When it is necessary to deploy the auxiliary boom, the operator first swings the auxiliary boom from the retracted position to the intermediate position. During the swing, the support structure remains in contact with the auxiliary boom, temporarily bearing its weight. After reaching the intermediate position, its end is connected to the end of the main boom, forming a partial connection. Then, the connection between the auxiliary boom and the connecting structure is released, and the auxiliary boom is completely transferred to the end of the main boom for support. Next, the auxiliary boom is swung to the deployed position, and its end is fully connected to the end of the main boom, completing the deployment operation.
[0007] When the auxiliary arm needs to be retracted, first disconnect the partial connection between the end of the auxiliary arm and the end of the main arm, and swing the auxiliary arm back from the deployed position to the middle position; then reconnect the auxiliary arm to the connecting structure, and then disconnect all connections between the end of the auxiliary arm and the end of the main arm; then continue to swing the auxiliary arm back to the retracted position. During the process of the auxiliary arm falling back to the retracted position, the support structure abuts against the auxiliary arm again, providing cushioning and temporary support for the auxiliary arm.
[0008] This invention utilizes a support structure fixed to the main boom to temporarily support the auxiliary boom after it is disconnected from the connecting structure but before it is fully connected to the end of the main boom. This fundamentally eliminates the safety hazard of the auxiliary boom accidentally falling during connection transitions. The support structure ensures that the auxiliary boom will never completely lose support at any time; even if the operator disconnects all connections at once, the auxiliary boom can still be temporarily supported by the support structure, providing reliable safety protection for on-site operations.
[0009] Preferably, the support structure includes a first limiting hook; the auxiliary arm is provided with a first hook structure, the first limiting hook being used to hook and cooperate with the first hook structure during the swinging of the auxiliary arm between the storage position and the intermediate position.
[0010] When the auxiliary arm swings from the storage position to the middle position, the first limiting hook can naturally hook onto the first hook structure to form a reliable limit. Even if the auxiliary arm is subjected to vibration, impact or careless operation during the swing process and has a tendency to swing back, the first limiting hook can effectively prevent the auxiliary arm from accidentally disengaging, thus improving safety.
[0011] Preferably, the first limiting hook includes at least two first hook bodies, each of which is connected to the main arm and is distributed at intervals along the length of the main arm.
[0012] Having at least two first hooks helps reduce the risk of deformation or failure of the support structure due to local overload, improves the overall strength and durability of the support structure, and thus reduces the risk of the auxiliary boom falling off unexpectedly.
[0013] Preferably, the auxiliary arm is provided with at least two barbs, the hook openings of which face opposite to the hook openings of the first hook body; when the auxiliary arm is in the storage position, the barbs are hooked and engaged with the first hook body in a one-to-one correspondence, and the first hook structure is hooked and engaged with the first hook body; when the auxiliary arm is in the intermediate position, the barbs are hooked and engaged with the first hook body in a one-to-one correspondence, and at least one of the barbs abuts against the end of its corresponding first hook body to prevent the auxiliary arm from swinging excessively.
[0014] Adding barbs can further reduce the risk of the jib detaching from the support structure.
[0015] Preferably, the support structure further includes a second limiting hook, which is distributed along the length direction of the main arm with the first limiting hook, and the second limiting hook is located on the side of the first limiting hook facing away from the end of the main arm; the auxiliary arm is provided with a second hook structure, which is used to hook and cooperate with the second hook structure during at least part of the swinging process of the auxiliary arm from the storage position to the intermediate position.
[0016] The second limit hook can reduce the burden on the first limit hook, significantly reduce the risk of deformation or fatigue damage to the first limit hook, and at the same time make the force on the auxiliary arm more even, thus making the auxiliary arm more stable and smooth during swing, further improving the safety and reliability of operation.
[0017] Preferably, the second limiting hook includes a support arm and a second hook body. One end of the support arm is connected to the main arm, and the other end is connected to the second hook body. When the auxiliary arm is in the storage position, the second hook structure abuts against the support arm. When the auxiliary arm is in the middle position, the second hook structure hooks and engages with the second hook body.
[0018] When the auxiliary boom is in the retracted position, the second hook structure abuts against the support arm, forming a stable initial load. As the auxiliary boom swings towards the intermediate position, the second hook structure slides smoothly along the support arm, eventually sliding into the hook opening of the second hook body, forming a hook engagement with the second hook body. During this process, the support arm provides continuous and smooth transition support for the auxiliary boom's swing from the retracted position to the intermediate position, avoiding impacts or swaying caused by sudden changes in load. Meanwhile, the second hook body provides reliable hook locking after the auxiliary boom reaches the intermediate position, reducing the risk of the auxiliary boom accidentally swinging back due to vibration, impact, or operational errors, and providing stable and reliable working conditions for connecting or disassembling the end of the auxiliary boom to the end of the main boom.
[0019] Preferably, the support arm is provided with a flat surface, an upward guide slope, and a downward guide slope. One end of the flat surface is connected to the main arm, and the other end of the flat surface is connected to one end of the downward guide slope. The other end of the downward guide slope is connected to the second limiting hook. The second hook structure is located on the side of the auxiliary arm facing the main arm when the auxiliary arm is in the storage position. When the auxiliary arm is in the storage position, the auxiliary arm abuts against the flat surface. When the auxiliary arm abuts against the downward guide slope, the first hook structure disengages from the first hook body.
[0020] When the auxiliary boom is in the retracted position, the flat surface provides a smooth and stable static support, ensuring reliable positioning and providing a stable starting and ending point for subsequent swinging operations. When the auxiliary boom swings from the retracted position to the middle position, the upward guide ramp first contacts the auxiliary boom, smoothly guiding it to the predetermined height, allowing the first hook structure to naturally detach from the first hook body. Subsequently, the downward guide ramp guides the second hook structure downwards, finally smoothly and accurately entering the hooking position of the second limit hook. This three-section structure allows the auxiliary boom to receive appropriate support and constraint in different positions, facilitating the fixing or disassembly of the auxiliary boom in different locations and improving operational reliability and safety.
[0021] Preferably, it further includes a first pin, a second pin, and a third pin; the auxiliary arm is provided with a first pin hole lug, a second pin hole lug, and a third pin hole lug, the second pin hole lug and the third pin hole lug being located on opposite sides of the end of the auxiliary arm; the connecting structure includes a fourth pin hole lug, and the main arm is also provided with a fifth pin hole lug and a sixth pin hole lug, the fifth pin hole lug and the sixth pin hole lug being located on opposite sides of the end of the main arm; when the auxiliary arm is in the storage position, the pin holes of the first pin hole lug and the fourth pin hole lug are aligned; when the auxiliary arm is in the intermediate position, the pin holes of the first pin hole lug and the fourth pin hole lug are aligned. The pin holes are aligned, and the pin holes of the second pin hole ear and the fifth pin hole ear are aligned; when the auxiliary arm is in the deployed position, the pin holes of the second pin hole ear and the fifth pin hole ear are aligned, and the pin holes of the third pin hole ear and the sixth pin hole ear are aligned; the first pin is used to pass between the first pin hole ear and the fourth pin hole ear to form a rotatable connection between the two; the second pin is used to pass between the second pin hole ear and the fifth pin hole ear to form a rotatable connection between the two; the third pin is used to pass between the third pin hole ear and the sixth pin hole ear to form a rotatable connection between the two.
[0022] Each pin hole corresponds to a pin, enabling precise connection between the auxiliary arm and the main arm in different positions. The first and fourth pin holes engage for the retracted position; the second and fifth pin holes engage for the intermediate position; and the second, third, and sixth pin holes engage for the deployed position. This correspondence ensures accurate fixation of the auxiliary arm in every position. Furthermore, the second and third pin holes are located on opposite sides of the auxiliary arm's end, and the fifth and sixth pin holes are located on opposite sides of the main arm's end. This creates a two-point connection between the auxiliary arm and the main arm in the deployed state, resulting in more even force distribution, stronger bending and torsional resistance, and greater stability in the deployed position.
[0023] Preferably, the auxiliary arm has a first side and a second side, the first side and the second side are disposed opposite to each other and distributed along the rotation axis of the auxiliary arm; the auxiliary arm is provided with a first reinforcing rod, one end of the first reinforcing rod is connected to the first side of the auxiliary arm, and the other end is connected to the second side of the auxiliary arm; the first pin hole lugs are all disposed on the first reinforcing rod.
[0024] The first reinforcing rod, acting as a strengthening frame, significantly improves the overall rigidity and bending load-bearing capacity of the jib, effectively preventing deformation or fatigue damage due to excessive force during hoisting operations and swinging. Simultaneously, the first pin hole lug, located on the first reinforcing rod, allows the load to be directly transferred to the overall structure of the jib through it, thus avoiding localized stress concentration and preventing deformation or fatigue damage due to excessive force, thereby extending the service life of the jib.
[0025] Secondly, the present invention also provides an engineering machine that is equipped with the aforementioned lifting arm assembly.
[0026] The engineering machinery includes, but is not limited to, various types of lifting equipment such as wheeled cranes, crawler cranes, tower cranes, truck cranes, all-terrain cranes, all-terrain tire cranes, and truck-mounted cranes, as well as other engineering machinery that requires the configuration of a main boom and auxiliary boom structure to extend the working height and range.
[0027] The beneficial effects of this invention are: 1. By setting a support structure on the main boom, temporary support is always provided for the auxiliary boom after it is disconnected from the connecting structure and before it is connected to the end of the main boom. This ensures that the auxiliary boom will never completely lose support at any time. Even if the operator disconnects all the pin connections at once, the auxiliary boom can still be supported by the support structure, which can fundamentally eliminate the safety hazard of the auxiliary boom falling accidentally during the connection state switching process.
[0028] 2. By setting the first limiting hook to engage with the first hook structure and the second limiting hook to engage with the second hook structure, the mechanical constraint on the auxiliary arm during the swing process will prevent it from accidentally disengaging even if subjected to vibration or impact, which can significantly improve the safety and stability of the auxiliary arm swing process.
[0029] 3. By segmenting the support arm of the second limiting hook into a flat surface, an upward guiding slope, and a downward guiding slope, the auxiliary arm receives graded support and precise guidance adapted to its posture during swinging. The flat surface provides stable static support in the storage position, ensuring reliable positioning of the auxiliary arm; the upward guiding slope smoothly raises the auxiliary arm to a predetermined height, allowing the first hook structure to naturally detach from the first hook body, achieving a smooth transfer of load; the downward guiding slope guides the second hook structure to accurately slide into the hooking position of the second limiting hook along the inclined surface. This "first raise, then lower" trajectory control allows the second hook structure to smoothly hook with the second hook body, avoiding the impact, jamming, or posture deviation that may occur from direct swinging of the auxiliary arm, significantly improving the smoothness and reliability of operation. Attached Figure Description
[0030] 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.
[0031] Figure 1 This is a schematic diagram of the structure of a lifting boom assembly according to an embodiment of the present invention, with the auxiliary boom in the retracted position; Figure 2 for Figure 1 The top view shown; Figure 3 for Figure 2 A magnified view of part B in the diagram; Figure 4 This is a schematic diagram of the structure of a lifting boom assembly according to an embodiment of the present invention, with the auxiliary boom in the middle position; Figure 5 for Figure 1 A magnified view of part A in the diagram; Figure 6 for Figure 4 A magnified view of part of C; Figure 7 This is a schematic diagram of a partial structure of the auxiliary arm; Figure 8 This is a schematic diagram of the second limiting hook. Figure 9 for Figure 4A magnified view of part of D; Figure 10 for Figure 4 A magnified view of part of E in the diagram.
[0032] Explanation of reference numerals in the attached figures: 1. Main arm; 101. Fifth pin hole ear; 102. Sixth pin hole ear; 2. Secondary arm; 201. First hook structure; 202. Second hook structure; 203. First pin hole ear; 204. Second pin hole ear; 205. Third pin hole ear; 3. Connecting structure; 4. First limiting hook; 401. First hook body; 402. Second reinforcing rod; 5. Barb; 6. Second limiting hook; 601. Support arm; 6011. Flat surface; 6012. Upward guide slope; 6013. Downward guide slope; 602. Second hook body; 7. First reinforcing rod. Detailed Implementation
[0033] 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.
[0034] The following is combined with Figures 1 to 10 The following describes embodiments of the present invention.
[0035] According to an embodiment of the present invention, in one aspect, a lifting boom assembly is provided, combined with Figures 1 to 4 As shown, it includes: a main arm 1; a secondary arm 2, which has a retracted position, a middle position, and an extended position relative to the main arm 1, one end of which is rotatably and detachably connected to the end of the main arm 1, so that the secondary arm 2 can swing between the extended position and the middle position relative to the main arm 1; a connecting structure 3, which is disposed on one side of the main arm 1, and is used to rotatably and detachably connect to the secondary arm 2 when the secondary arm 2 is in the middle position, so that the secondary arm 2 can swing between the retracted position and the middle position relative to the main arm 1; and a support structure, which is disposed on the main arm 1, and is used to support the secondary arm 2 during the swinging process between the retracted position and the middle position.
[0036] In this embodiment, the lifting boom assembly, when the auxiliary boom 2 is in the retracted position, is connected to the main boom 1 via the connecting structure 3. Simultaneously, the auxiliary boom 2 is fully retracted to the side of the main boom 1, with the support structure abutting against it. When it is necessary to deploy the auxiliary boom 2, the operator first swings it from the retracted position to the intermediate position. During the swing, the support structure remains in contact with the auxiliary boom 2, temporarily bearing its weight. After reaching the intermediate position, the auxiliary boom 2's end is connected to the end of the main boom 1, forming a partial connection. Then, the connection between the auxiliary boom 2 and the connecting structure 3 is released, and the auxiliary boom 2 is completely transferred to be supported by the end of the main boom 1. Next, the auxiliary boom 2 is swung to the deployed position, and its end is fully connected to the end of the main boom 1, completing the deployment operation.
[0037] When it is necessary to retract the auxiliary arm 2, first disconnect the part of the connection between the end of the auxiliary arm 2 and the end of the main arm 1, and swing the auxiliary arm 2 back from the deployed position to the middle position; then reconnect the auxiliary arm 2 to the connecting structure 3, and then disconnect all the connections between the end of the auxiliary arm 2 and the end of the main arm 1; then continue to swing the auxiliary arm 2 back to the retracted position. During the process of the auxiliary arm 2 falling back to the retracted position, the support structure abuts against the auxiliary arm 2 again, providing cushioning and temporary support for the auxiliary arm 2.
[0038] In this embodiment, the boom assembly utilizes a support structure fixed to the main boom 1 to temporarily support the auxiliary boom 2 after it is disconnected from the connecting structure 3 and before it is fully connected to the end of the main boom 1. This fundamentally eliminates the safety hazard of the auxiliary boom 2 accidentally falling during the connection state switching process. The support structure ensures that the auxiliary boom 2 will never completely lose support at any time. Even if the operator disconnects all connections at once, the auxiliary boom 2 can still be temporarily supported by the support structure, providing reliable safety protection for on-site operations.
[0039] Furthermore, combined Figure 1 , Figures 4 to 7 As shown, the support structure includes a first limiting hook 4; the auxiliary arm 2 is provided with a first hook structure 201. The first limiting hook 4 is used to hook and cooperate with the first hook structure 201 during the swinging process of the auxiliary arm 2 between the retracted position and the intermediate position. The first hook structure 201 can be a structure of the auxiliary arm 2 itself, or it can be an additional structure provided on the auxiliary arm 2. In this embodiment, the first hook structure 201 is a structure of the auxiliary arm 2 itself, and it is in the shape of a round rod.
[0040] When the auxiliary arm 2 swings from the storage position to the middle position, the first limiting hook 4 can naturally hook the first hook structure 201 to form a reliable limit. Even if the auxiliary arm 2 is subjected to vibration, impact or careless operation during the swing process and has a tendency to swing back, the first limiting hook 4 can effectively prevent the auxiliary arm 2 from accidentally disengaging, thus improving safety.
[0041] Furthermore, the first limiting hook 4 includes two first hook bodies 401, each connected to the main arm 1 and spaced apart along the length of the main arm 1. Of course, the number of first hook bodies 401 is not limited to two; there can be multiple. Specifically, one end of each first hook body 401 is fixedly connected to the main arm 1, and its body portion is a horizontally extending load-bearing section used to slide against the first hook structure 201 on the auxiliary arm 2 during the swinging process, thereby bearing the weight of the auxiliary arm 2; the other end of the first hook body 401 forms an upwardly bent hook-shaped structure used to hook and limit the first hook structure 201, preventing the first hook structure 201 from accidentally detaching from the end of the first hook body 401.
[0042] Setting up two first hooks 401 helps reduce the risk of deformation or failure of the support structure due to local overload, improves the overall strength and durability of the support structure, and thus reduces the risk of the auxiliary boom 2 falling off accidentally.
[0043] Furthermore, the first limiting hook 4 also includes a second reinforcing rod 402, which is connected to the main arm 1 and extends along the rotation axis of the auxiliary arm 2. Both first hook bodies 401 are connected to the second reinforcing rod 402.
[0044] The second reinforcing rod 402, acting as a reinforcing frame, improves the overall rigidity and bending load-bearing capacity of the main boom 1. The load it bears can be directly transferred to the overall structure of the main boom 1 through the first reinforcing rod 7, thereby avoiding local stress concentration and preventing the main boom 1 from deforming or fatigued due to excessive force, which helps to extend the service life of the main boom 1.
[0045] Furthermore, the auxiliary arm 2 is provided with two barbs 5, the hook openings of which face opposite directions to the hook openings of the first hook body 401, i.e., the hook openings of the barbs 5 face downwards and the hook openings of the first hook body 401 face upwards. When the auxiliary arm 2 is in the retracted position, the barbs 5 and the first hook body 401 are hooked and engaged in a one-to-one correspondence, and the first hook structure 201 is hooked and engaged in a one-to-one correspondence with the first hook body 401. When the auxiliary arm 2 is in the middle position, the barbs 5 and the first hook body 401 are hooked and engaged in a one-to-one correspondence, and at least one barb 5 abuts against the end of its corresponding first hook body 401 to prevent the auxiliary arm 2 from swinging excessively.
[0046] Setting up barbs 5 can further reduce the risk of the auxiliary boom 2 detaching from the support structure.
[0047] In this embodiment, when the auxiliary arm 2 is in the middle position, the first hook structure 201 disengages from the first hook body 401.
[0048] Furthermore, combined Figure 1 , Figure 2 , Figure 4 , Figure 8 and Figure 9 As shown, the support structure also includes a second limiting hook 6, which is distributed along the length of the main arm 1 along with the first limiting hook 4, and the second limiting hook 6 is located on the side of the first limiting hook 4 facing away from the end of the main arm 1. The auxiliary arm 2 is provided with a second hook structure 202, and the second limiting hook 6 is used to hook and cooperate with the second hook structure 202 during at least a portion of the swinging process of the auxiliary arm 2 from the retracted position to the intermediate position. The second hook structure 202 can be a structure of the auxiliary arm 2 itself, or it can be an additional structure provided on the auxiliary arm 2. In this embodiment, the second hook structure 202 is a structure of the auxiliary arm 2 itself, and it is in the shape of a round rod.
[0049] The setting of the second limiting hook 6 can reduce the burden on the first limiting hook 4, greatly reduce the risk of deformation or fatigue damage of the first limiting hook 4, and at the same time make the force on the auxiliary arm 2 more even, so that the auxiliary arm 2 is more stable and smooth during the swinging process, further improving the safety and reliability of operation.
[0050] Furthermore, the second limiting hook 6 includes a support arm 601 and a second hook body 602. One end of the support arm 601 is connected to the main arm 1, and the other end is connected to the second hook body 602. When the auxiliary arm 2 is in the retracted position, the second hook structure 202 abuts against the support arm 601. When the auxiliary arm 2 is in the intermediate position, the second hook structure 202 hooks and engages with the second hook body 602. The shape of the second hook body 602 is adapted to the shape of the second hook structure 202 to make the second hook structure 202 more stable on the second hook body 602.
[0051] When the auxiliary arm 2 is in the retracted position, the second hook structure 202 abuts against the support arm 601, forming a stable initial load. As the auxiliary arm 2 swings towards the middle position, the second hook structure 202 slides smoothly along the support arm 601, eventually sliding into the hook opening of the second hook body 602, forming a hook engagement with the second hook body 602. During this process, the support arm 601 provides continuous and smooth transition support for the auxiliary arm 2 as it swings from the retracted position to the middle position, avoiding impacts or swaying caused by sudden changes in load. The second hook body 602 provides reliable hook locking after the auxiliary arm 2 reaches the middle position, reducing the risk of the auxiliary arm 2 accidentally swinging back due to vibration, impact, or operational errors, and providing stable and reliable working conditions for connecting or disassembling the end of the auxiliary arm 2 to the end of the main arm 1.
[0052] Furthermore, the support arm 601 is provided with a flat surface 6011, an upward guide slope 6012, and a downward guide slope 6013. One end of the flat surface 6011 is connected to the main arm 1, and the other end of the flat surface 6011 is connected to one end of the downward guide slope 6013. The other end of the downward guide slope 6013 is connected to the second limiting hook 6. The second hook structure 202 is located on the side of the auxiliary arm 2 facing the main arm 1 when the auxiliary arm 2 is in the storage position. When the auxiliary arm 2 is in the storage position, the auxiliary arm 2 abuts against the flat surface 6011. When the auxiliary arm 2 abuts against the downward guide slope 6013, the first hook structure 201 disengages from the first hook body 401.
[0053] When the auxiliary arm 2 is in the retracted position, the flat surface 6011 provides a flat and stable static support, ensuring that the auxiliary arm 2 is reliably positioned and providing a stable starting and ending point for subsequent swinging operations. When the auxiliary arm 2 swings from the retracted position to the middle position, the upward guiding slope 6012 first contacts the auxiliary arm 2, smoothly guiding the auxiliary arm 2 to the predetermined height, thereby allowing the first hook structure 201 to naturally detach from the first hook body 401. Subsequently, the downward guiding slope 6013 takes over the guidance, causing the second hook structure 202 to slide downwards and finally smoothly and accurately enter the hooking position of the second limiting hook 6. Through the three-section structure, the auxiliary arm 2 can obtain corresponding support and constraint in different positions, which can facilitate the fixing or disassembly of the auxiliary arm 2 in different positions, improving the reliability and safety of operation.
[0054] The guide ramp guides the second hook structure 202 to slide smoothly and accurately into the hook opening of the second hook body 602, ensuring a reliable hook-and-hook engagement. Once the hook-and-hook engagement is complete, the second hook body 602 effectively locks the auxiliary arm 2. The guide ramp and the second hook body 602 work together to prevent accidental swinging due to vibration, impact, or operational errors, ensuring that the auxiliary arm 2 remains safe and stable in the intermediate position.
[0055] Furthermore, combined Figures 1 to 4 , Figure 6 and Figure 10As shown, the lifting boom assembly also includes a first pin, a second pin, and a third pin (not shown in the figure); the auxiliary boom 2 is provided with a first pin hole lug 203, a second pin hole lug 204, and a third pin hole lug 205, with the second pin hole lug 204 and the third pin hole lug 205 located on opposite sides of the end of the auxiliary boom 2; the connecting structure 3 includes a fourth pin hole lug, which is disposed on the second reinforcing rod 402, i.e., the fourth pin hole lug is connected to the main boom 1 through the second reinforcing rod 402; the main boom 1 is also provided with a fifth pin hole lug 101 and a sixth pin hole lug 102, which are located on opposite sides of the end of the main boom 1; when the auxiliary boom 2 is in the retracted position, the pin holes of the first pin hole lug 203 and the fourth pin hole lug are connected. Alignment: When the auxiliary arm 2 is in the middle position, the pin holes of the first pin hole ear 203 and the fourth pin hole ear are aligned, and the pin holes of the second pin hole ear 204 and the fifth pin hole ear 101 are aligned; when the auxiliary arm 2 is in the extended position, the pin holes of the second pin hole ear 204 and the fifth pin hole ear 101 are aligned, and the pin holes of the third pin hole ear 205 and the sixth pin hole ear 102 are aligned; the first pin is used to pass between the first pin hole ear 203 and the fourth pin hole ear to form a rotatable connection between the two; the second pin is used to pass between the second pin hole ear 204 and the fifth pin hole ear 101 to form a rotatable connection between the two; the third pin is used to pass between the third pin hole ear 205 and the sixth pin hole ear 102 to form a rotatable connection between the two.
[0056] Each pin hole corresponds to a pin, enabling precise connection between the auxiliary arm 2 and the main arm 1 in different positions. The first pin hole 203 engages with the fourth pin hole 1 for the retracted position; the second pin hole 204 engages with the fifth pin hole 101 for the intermediate position; the second pin hole 204 engages with the fifth pin hole 101, and the third pin hole 205 engages with the sixth pin hole 102 for the deployed position. This correspondence ensures accurate fixation of the auxiliary arm 2 in every position. Furthermore, the second pin hole 204 and the third pin hole 205 are located on opposite sides of the end of the auxiliary arm 2, and the fifth pin hole 101 and the sixth pin hole 102 are located on opposite sides of the end of the main arm 1. This creates a two-point connection between the auxiliary arm 2 and the main arm 1 in the deployed state, resulting in more even force distribution, stronger bending and torsional resistance, and greater stability in the deployed position. The number of the second pin hole lug 204, the third pin hole lug 205, the fifth pin hole lug 101, and the sixth pin hole lug 102 is not limited to one; two or more can be provided as needed to make the connection between the auxiliary arm 2 and the main arm 1 more stable when in the extended position. In this embodiment, two of each of the following pin hole lugs are provided: the second pin hole lug 204, the third pin hole lug 205, the fifth pin hole lug 101, and the sixth pin hole lug 102.
[0057] It should be noted that the aforementioned pins and pin holes are all existing technologies, therefore, this embodiment will not further describe their specific structure and mating method.
[0058] Furthermore, combined Figure 1 , Figures 4 to 7 As shown, the auxiliary arm 2 has a first side and a second side, which are arranged opposite to each other and distributed along the rotation axis of the auxiliary arm 2; the auxiliary arm 2 is provided with a first reinforcing rod 7, which is located between two first hook bodies 401, and one end of the first reinforcing rod 7 is connected to the first side of the auxiliary arm 2, and the other end is connected to the second side of the auxiliary arm 2; the barb 5 and the first pin hole lug 203 are both provided on the first reinforcing rod 7.
[0059] The first reinforcing rod 7 functions similarly to the second reinforcing rod 402. As a reinforcing frame, it significantly improves the overall rigidity and bending load-bearing capacity of the jib 2, effectively preventing deformation or fatigue damage due to excessive force during hoisting operations and swinging. Simultaneously, by concentrating two key stress points—the first hook structure 201 for temporary load bearing and the first pin hole lug 203 for secure mounting—on the first reinforcing rod 7, the load can be directly transferred to the overall structure of the jib 2 through the first reinforcing rod 7. This avoids localized stress concentration, prevents deformation or fatigue damage due to excessive force on the jib 2, and helps extend its service life.
[0060] According to an embodiment of the present invention, another aspect provides an engineering machine that is equipped with the aforementioned lifting boom assembly.
[0061] The engineering machinery includes, but is not limited to, various types of lifting equipment such as wheeled cranes, crawler cranes, tower cranes, truck cranes, all-terrain cranes, all-terrain tire cranes, and truck-mounted cranes, as well as other engineering machinery that requires the configuration of a main boom 1 and a jib 2 structure to extend the working height and range.
[0062] 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 crane boom assembly, characterized in that, include: Main arm (1); The auxiliary arm (2) has a storage position, a middle position and an unfolded position relative to the main arm (1). One end of the auxiliary arm (2) is rotatably and detachably connected to the end of the main arm (1), so that the auxiliary arm (2) can swing between the unfolded position and the middle position relative to the main arm (1). A connecting structure (3) is provided on one side of the main arm (1) for rotatably and detachably connecting with the secondary arm (2) when the secondary arm (2) is in the middle position, so that the secondary arm (2) can swing relative to the main arm (1) between the storage position and the middle position; A support structure is provided on the main arm (1) for supporting the auxiliary arm (2) during the swinging process of the auxiliary arm (2) between the storage position and the intermediate position.
2. The lifting boom assembly according to claim 1, characterized in that, The support structure includes a first limiting hook (4); the auxiliary arm (2) is provided with a first hook structure (201), and the first limiting hook (4) is used to hook and cooperate with the first hook structure (201) during the swinging of the auxiliary arm (2) between the storage position and the intermediate position.
3. The lifting boom assembly according to claim 2, characterized in that, The first limiting hook (4) includes at least two first hook bodies (401), each of which is connected to the main arm (1) and is distributed at intervals along the length direction of the main arm (1).
4. The lifting boom assembly according to claim 3, characterized in that, The auxiliary arm (2) is provided with at least two barbs (5), the hook openings of which face opposite to the hook openings of the first hook body (401); when the auxiliary arm (2) is in the storage position, the barbs (5) are hooked and engaged with the first hook body (401) in a one-to-one correspondence, and the first hook structure (201) is hooked and engaged with the first hook body (401); when the auxiliary arm (2) is in the middle position, the barbs (5) are hooked and engaged with the first hook body (401) in a one-to-one correspondence, and at least one of the barbs (5) abuts against the end of the first hook body (401) corresponding to it.
5. The lifting boom assembly according to claim 4, characterized in that, The support structure further includes a second limiting hook (6), which is distributed along the length direction of the main arm (1) along with the first limiting hook (4), and the second limiting hook (6) is located on the side of the first limiting hook (4) facing away from the end of the main arm (1); the auxiliary arm (2) is provided with a second hook structure (202), which is used to hook and cooperate with the second hook structure (202) during at least part of the process of the auxiliary arm (2) swinging from the storage position to the middle position.
6. The lifting boom assembly according to claim 5, characterized in that, The second limiting hook (6) includes a support arm (601) and a second hook body (602). One end of the support arm (601) is connected to the main arm (1), and the other end is connected to the second hook body (602). When the auxiliary arm (2) is in the storage position, the second hook structure (202) abuts against the support arm (601). When the auxiliary arm (2) is in the middle position, the second hook structure (202) hooks and engages with the second hook body (602).
7. The lifting boom assembly according to claim 6, characterized in that, The support arm (601) is provided with a flat surface (6011), an upward guide slope (6012), and a downward guide slope (6013). One end of the flat surface (6011) is connected to the main arm (1), and the other end of the flat surface (6011) is connected to one end of the downward guide slope (6013). The other end of the downward guide slope (6013) is connected to the second limiting hook (6). The second hook structure (202) is located on the side of the auxiliary arm (2) facing the main arm (1) when it is in the storage position. When the auxiliary arm (2) is in the storage position, the auxiliary arm (2) abuts against the flat surface (6011). When the auxiliary arm (2) abuts against the downward guide slope (6013), the first hook structure (201) disengages from the first hook body (401).
8. The lifting boom assembly according to claim 2, characterized in that, It also includes a first pin, a second pin, and a third pin; the auxiliary arm (2) is provided with a first pin hole lug (203), a second pin hole lug (204), and a third pin hole lug (205), the second pin hole lug (204) and the third pin hole lug (205) being located on opposite sides of the end of the auxiliary arm (2); the connecting structure (3) includes a fourth pin hole lug, and the main arm (1) is also provided with a fifth pin hole lug (101) and a sixth pin hole lug (102), the fifth pin hole lug (101) and the sixth pin hole lug (102) being located on opposite sides of the end of the main arm (1); When the auxiliary arm (2) is in the storage position, the first pin hole ear (203) is aligned with the pin hole of the fourth pin hole ear; When the auxiliary arm (2) is in the middle position, the first pin hole ear (203) is aligned with the pin hole of the fourth pin hole ear, and the second pin hole ear (204) is aligned with the pin hole of the fifth pin hole ear (101). When the auxiliary arm (2) is in the unfolded position, the pin holes of the second pin hole ear (204) and the fifth pin hole ear (101) are aligned, and the pin holes of the third pin hole ear (205) and the sixth pin hole ear (102) are aligned. The first pin is used to pass between the first pin hole ear (203) and the fourth pin hole ear so that the two form a rotatable connection; the second pin is used to pass between the second pin hole ear (204) and the fifth pin hole ear (101) so that the two form a rotatable connection; the third pin is used to pass between the third pin hole ear (205) and the sixth pin hole ear (102) so that the two form a rotatable connection.
9. The lifting boom assembly according to claim 8, characterized in that, The auxiliary arm (2) has a first side and a second side, the first side and the second side are arranged opposite to each other and distributed along the rotation axis of the auxiliary arm (2); the auxiliary arm (2) is provided with a first reinforcing rod (7), one end of the first reinforcing rod (7) is connected to the first side of the auxiliary arm (2) and the other end is connected to the second side of the auxiliary arm (2); the first pin hole lug (203) is provided on the first reinforcing rod (7).
10. An engineering machinery, characterized in that, The crane boom assembly as described in any one of claims 1 to 9 is installed.