Hoisting apparatus for civil engineering

Abstract

The application provides a hoisting device for civil engineering, which comprises a hook, a connecting piece arranged along a first plane, a first rotating piece and a second rotating piece, one end of the second rotating piece is connected to the connecting piece, the other end of the second rotating piece is rotatably connected to the first rotating piece, and the first rotating piece can rotate in the first plane; the hook has an open state and a closed state in use, when in the open state, the first rotating piece does not contact the connecting piece; when in the closed state, the first rotating piece abuts against the connecting piece, and the first rotating piece has a force acting on the connecting piece. Thus, by dividing the hook into the connecting piece, the first rotating piece and the second rotating piece, the position of stress concentration is changed by the first rotating piece contacting the connecting piece in use, the maximum stress borne by the hook is reduced, and the service life of the hook is improved.

Description

Technical Field

[0001] This invention relates to the field of construction engineering, and in particular to a lifting device for civil construction. Background Technology

[0002] In the construction process of modern civil engineering and building projects, lifting equipment, as a key vertical transportation device, undertakes important tasks such as hoisting and transporting various building materials, components, and construction tools. From hoisting steel bars and formwork during the foundation construction stage, to transporting precast concrete components during the main structure construction, and then to moving decorative materials during the decoration and finishing stage.

[0003] CN112723142A discloses a crane hook that can prevent disengagement, including a first mounting box, a second mounting box, a first clamping mechanism, a second clamping mechanism, a buffer mechanism, and a hook body. The second mounting box is disposed on the first mounting box, the first clamping mechanism is disposed inside the second mounting box, and the working end of the first clamping mechanism passes through both sides of the second mounting box and extends to the outside. There are two sets of second clamping mechanisms, and the two sets of second clamping mechanisms have the same structure. The two sets of second clamping mechanisms are respectively disposed at the two working ends of the first clamping mechanism. There are two sets of buffer mechanisms, and the two sets of buffer mechanisms are symmetrically disposed inside the first mounting box. The top of the hook body is disposed inside the first mounting box.

[0004] However, in the actual use of traditional crane hooks, including those mentioned in the patent, the hook, as a key component that directly bears heavy loads, suffers from significant stress concentration areas during lifting. Excessive stress poses a serious threat to the hook's safety performance and service life. Over long-term use, the dynamic loads from heavy lifting, high operating frequency, and frequent start-stop cycles easily accumulate in these stress concentration areas, leading to fatigue fracture or localized failure. Summary of the Invention

[0005] Therefore, it is necessary to provide a new type of lifting equipment for civil construction to address the problem of excessive stress causing hook damage in current lifting equipment used in civil construction.

[0006] The above objectives are achieved through the following technical solutions:

[0007] A lifting device for civil construction includes: a hook, the hook including a connector, a first rotating member and a second rotating member disposed along a first plane, one end of the second rotating member being connected to the connector, and the other end of the second rotating member being rotatably connected to the first rotating member, the first rotating member being capable of rotating within the first plane;

[0008] The hook has an open state and a closed state during use. When it is in the open state, the first rotating member does not contact the connecting member; when it is in the closed state, the first rotating member abuts against the connecting member and exerts a force on the connecting member.

[0009] Furthermore, a first area for loading lifting equipment is formed inside the hook. The first rotating member is provided with a toggle plate in the first area. The toggle plate rotates in the forward direction, causing the first rotating member to enter a closed state from an open state. When in the closed state, the toggle plate contacts the second rotating member, and the first rotating member contacts the connecting member.

[0010] Furthermore, a protrusion is provided at the end of the first rotating member away from the second rotating member, and the connecting member is provided with a groove that cooperates with the protrusion. When in the closed state, the protrusion is engaged with the groove.

[0011] Furthermore, the first rotating member is rotatably connected to the second rotating member via a first elastic member, and the elastic force of the first elastic member always causes the first rotating member to rotate toward the connecting member or has a tendency to rotate.

[0012] Furthermore, the second rotating member is provided with a limiting rod, which is used to limit the rotation of the first rotating member when the hook is not in use.

[0013] Furthermore, a third elastic element is provided between the limiting rod and the second rotating member. The elastic force of the third elastic element always causes the limiting rod to move away from the second rotating member or has a tendency to move away from the second rotating member. The elastic force of the third elastic element is greater than the elastic force of the first elastic element.

[0014] Furthermore, the second rotating member and the connecting member are rotatably connected. When the protrusion is engaged in the slot and is in the closed state, the angle of the second rotating member's forward rotation and the magnitude of the force between the protrusion and the slot are positively correlated.

[0015] Furthermore, the connector is provided with a rotating groove, and the second rotating member is provided with a rotating block, the rotating block being located within the rotating groove. The rotating block and the rotating groove are used to limit the rotation amplitude of the second rotating member.

[0016] Furthermore, a second elastic element is provided at the connection between the second rotating member and the connecting member, and the elastic force of the second elastic element always causes the second rotating member to rotate in the opposite direction or has a tendency to rotate in the opposite direction.

[0017] Furthermore, the elastic force of the second elastic member is greater than that of the first elastic member, so that when in the open state, the second rotating member and the connecting member do not rotate relative to each other.

[0018] The beneficial effects of this invention are:

[0019] This invention provides a lifting device for civil construction, comprising: a hook, the hook including a connector, a first rotating member, and a second rotating member disposed along a first plane, one end of the second rotating member being connected to the connector, and the other end of the second rotating member being rotatably connected to the first rotating member, the first rotating member being capable of rotating within the first plane; the hook has an open state and a closed state during use, in the open state the first rotating member does not contact the connector; in the closed state the first rotating member abuts against the connector and exerts a force on the connector. Thus, by dividing the hook into a connector, a first rotating member, and a second rotating member, and by having the first rotating member contact the connector during use to change the stress concentration location, the maximum stress borne by the hook is reduced, and the service life of the hook is improved. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of a lifting device for civil construction provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of a lifting hook for a civil engineering construction device according to an embodiment of the present invention.

[0022] Figure 3 This is a static stress analysis diagram of the hook of a traditional lifting equipment used in civil construction to lift heavy objects.

[0023] Figure 4 A static stress analysis diagram of a hook for a lifting device used in civil construction, provided according to an embodiment of the present invention;

[0024] Figure 5 A side view of a lifting hook for a lifting device used in civil construction, provided according to an embodiment of the present invention;

[0025] Figure 6 for Figure 5 A cross-sectional view of section AA of the lifting equipment used in civil construction with the hook in the open position;

[0026] Figure 7 for Figure 6 A schematic diagram of the structure of the hook at point B of the lifting equipment used in civil construction;

[0027] Figure 8 for Figure 5A cross-sectional view of section AA of the lifting equipment used in civil construction with the hook in the closed state;

[0028] Figure 9 An exploded front view of the hook of a lifting device for civil construction provided in an embodiment of the present invention;

[0029] Figure 10 This is an exploded view of the back of a hook of a lifting device used in civil construction, provided as an embodiment of the present invention.

[0030] in:

[0031] 100. Bracket;

[0032] 200. Hook; 210. Connector; 211. Slot; 212. Rotating groove; 220. First rotating component; 221. Actuating piece; 222. Protrusion; 223. First elastic component; 224. First limiting groove; 230. Second rotating component; 231. Second elastic component; 232. Rotating block; 233. Limiting rod; 234. Second limiting groove; 235. Third elastic component;

[0033] 300. Slide rail lever arm. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0035] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] The following reference Figures 1-10 This invention describes a lifting device for civil construction provided by an embodiment of the present invention.

[0038] The lifting equipment for civil construction provided in this embodiment of the invention is particularly suitable for hoisting building materials during the construction of main structures such as high-rise buildings. Of course, the lifting equipment for civil construction can also be used for heavy lifting operations in other construction engineering scenarios.

[0039] Specifically, such as Figure 1 As shown, the lifting equipment used in civil construction includes a support frame 100, a sliding rail arm 300, and a hook 200. The support frame 100 serves as a stable foundation for the lifting equipment and is fixedly installed on the ground or other solid, fixed platform. One end of the sliding rail arm 300 is securely connected to the support frame 100 to position the hook 200 at different locations, providing horizontal displacement support for lifting operations. The hook 200 is suspended below the other end of the sliding rail arm 300 to lift heavy objects. Driven by the sliding rail arm 300, the hook 200 performs lifting and transferring operations on various building materials and components. When heavy objects need to be transported, they are first suspended from the hook 200 using a lifting device, allowing the object to move with the hook 200. When the object reaches its destination, the lifting device is removed from the hook 200, and the object is then unloaded.

[0040] To reduce stress-induced damage, such as Figures 2-4 As shown, the hook 200 includes a connector 210, a first rotating member 220 and a second rotating member 230 arranged along a first plane. One end of the second rotating member 230 is connected to the connector 210, and the other end of the second rotating member 230 is rotatably connected to the first rotating member 220. The first rotating member 220 is capable of rotating in the first plane.

[0041] The hook 200 has an open state and a closed state during use. When it is in the open state, the first rotating member 220 does not contact the connecting member 210. When it is in the closed state, the first rotating member 220 abuts against the connecting member 210 and exerts a force on the connecting member 210.

[0042] Specifically, when the lifting device is hoisted onto the hook 200, the first rotating member 220 rotates under the weight of the lifted item and comes into contact with the connecting member 210, and the connecting member 210 is subjected to the force of the first rotating member 220. Before and after the first rotating member 220 rotates, the hook 200 has corresponding open and closed states. In the open state, the first rotating member 220 does not contact the connecting member 210; in the closed state, the first rotating member 220 contacts the connecting member 210.

[0043] An external load of 100N is applied to the hook 200, with the force directed downwards. The conventional static stress analysis of the hook 200 is as follows: Figure 3 As shown, the hook 200 is bent on the right side, which is a vulnerable area. This vulnerable area has a stress concentration point, and the maximum stress value is 56.39 kPa.

[0044] Static stress analysis was performed by applying the same load to the hook 200 in this embodiment, such as... Figure 4 As shown, after the first rotating member 220 contacts the connecting member 210, the stress is mainly concentrated at the contact point between the first rotating member 220 and the connecting member 210, as well as on the connecting member 210 itself, with a maximum stress value of 19.77 kPa. Clearly, the maximum stress value of a conventional hook 200 is greater than the maximum stress value of the hook 200 in this embodiment.

[0045] Therefore, by making the first rotating member 220 contact the connecting member 210 and generating a contact force, the location of stress concentration is changed, the maximum stress borne by the hook 200 is reduced, and the service life of the hook 200 is improved.

[0046] In one embodiment, such as Figures 5-10 As shown, in order to drive the first rotating member 220 to rotate by a heavy object, a first area for loading lifting equipment is formed inside the hook 200. The first rotating member 220 is provided with a toggle piece 221 in the first area. The toggle piece 221 rotates in the forward direction, causing the first rotating member 220 to enter the closed state from the open state. When in the closed state, the toggle piece 221 contacts the second rotating member 230, and the first rotating member 220 contacts the connecting member 210.

[0047] Specifically, the hook 200 has a first area inside for loading the lifting device. When no load is placed on the lifting device, the first area is in an unloaded state. The first rotating component 220 is provided with a toggle piece 221 in the first area. When a load is placed on the lifting device, the gravity generated by the load acts on the lifting device, causing the lifting device to move downward in the first area.

[0048] During the downward movement of the spreader, the actuating plate 221 is located in the first area and in contact with the spreader. The downward movement of the spreader will cause the actuating plate 221 to move downward synchronously. The downward movement of the actuating plate 221 is a forward movement, and it is in the open state at this time. When the spreader drives the actuating plate 221 to move forward until the actuating plate 221 contacts the second rotating member 230, the spreader stops moving. At this time, the first rotating member 220 contacts the connecting member 210 and is in the closed state.

[0049] The actuating piece 221 is fixedly connected to the first rotating member 220. When the actuating piece 221 moves forward, it applies a torque to the first rotating member 220, thereby causing the first rotating member 220 to rotate around the center of the connecting shaft of the first rotating member 220 and the second rotating member 230 toward the connecting member 210, thus converting the weight of the object into the driving force for the rotation of the first rotating member 220.

[0050] Thus, the force exerted by the weight of the object on the lifting device causes the lifting device to move downward in the first area, while simultaneously driving the actuating plate 221 to move forward, completing the rotation of the first rotating component 220.

[0051] In one embodiment, such as Figures 5-10 As shown, in order to better disperse the stress in the vulnerable area, a protrusion 222 is provided at the end of the first rotating member 220 away from the second rotating member 230, and a groove 211 that cooperates with the protrusion 222 is provided on the connector 210. When in the closed state, the protrusion 222 is engaged with the groove 211.

[0052] Specifically, in the open state, the first rotating member 220 rotates toward the connecting member 210, and the protrusion 222 moves closer to the slot 211 as the first rotating member 220 rotates. In the closed state, the first rotating member 220 and the connecting member 210 fully abut against each other, and the protrusion 222 is engaged in the slot 211.

[0053] When force is applied to a structure with a certain shape and connection method, the force will be redistributed along the contact interface according to the size of the contact area. Therefore, the snap-fit ​​relationship between the protrusion 222 and the slot 211 allows the stress in the vulnerable area of ​​the hook 200 to be distributed more to the contact surface of the protrusion 222 and the slot 211.

[0054] Therefore, through the cooperation of the protrusion 222 and the slot 211, the stress originally concentrated on a small contact surface is dispersed to a larger contact area, effectively reducing the stress on the vulnerable area and reducing the risk of damage to the hook 200 due to excessive stress. At the same time, the snap-fit ​​method of the protrusion 222 and the slot 211 enhances the connection strength between the first rotating member 220 and the connecting member 210, making the hook 200 more stable when subjected to external forces.

[0055] In one embodiment, such as Figures 5-10 As shown, during the lifting of heavy objects, when subjected to external interference or vibration, in order to ensure that the first rotating member 220 can still maintain contact with the connecting member 210, the first rotating member 220 is rotatably connected to the second rotating member 230 through the first elastic member 223. The elastic force of the first elastic member 223 always causes the first rotating member 220 to rotate toward the connecting member 210 or has a tendency to rotate.

[0056] Specifically, before lifting a heavy object, the hook 200 is in its initial state, and the first rotating member 220 rotates toward the connector 210 under the action of the first elastic member 223 until it abuts against the connector 210. When placing the lifting device, the external force partially offsets the elastic force of the first elastic member 223, causing the first rotating member 220 to move away from the connector 210, and the hook 200 is in the open state. The lifting device is placed in the first area of ​​the hook 200. After the external force is removed, the first rotating member 220 rotates toward the connector 210 until the protrusion 222 engages with the slot 211, entering the closed state.

[0057] During the lifting of heavy objects, when there is no external interference or vibration, the first rotating component 220 maintains stable contact with the connecting component 210 by relying on the engagement of the protrusion 222 and the slot 211, as well as the elastic force of the first elastic component 223. When the hook 200 is subjected to external interference or vibration, the elastic force of the first elastic component 223 can offset part of the external force, so that the first rotating component 220 always maintains contact with the connecting component 210 or quickly returns to the state of contact with the connecting component 210.

[0058] Therefore, the elastic force generated by the deformation of the first elastic element 223 under force enhances the connection stability between the first rotating element 220 and the connecting element 210.

[0059] In one embodiment, such as Figures 5-10 As shown, in order to make the hook 200 open in the initial state, a limiting rod 233 is provided on the second rotating member 230.

[0060] Specifically, a first limiting groove 224 is provided on the first rotating member 220, and a second limiting groove 234 that cooperates with the first limiting groove 224 is provided on the second rotating member 230.

[0061] With the hook 200 in the open state, the limiting rod 233 is placed in the first limiting groove 224 and the second limiting groove 234, restricting the first rotating member 220 and the second rotating member 230 from rotating relative to each other. When the lifting device is placed into the first area of ​​the hook 200, the limiting rod 233 is disengaged from the first limiting groove 224, releasing the restriction on the relative rotation of the first rotating member 220 and the second rotating member 230. After the hook 200 is used, the limiting rod 233 is placed back into the first limiting groove 224 and the second limiting groove 234, returning the hook to the open state.

[0062] Therefore, when the lifting device is initially placed on the hook 200, the hook 200 is in the open state.

[0063] In one embodiment, such as Figures 5-10 As shown, in order to improve the working efficiency of the hook 200, a third elastic element 235 is provided between the limiting rod 233 and the second rotating member 230. The elastic force of the third elastic element 235 always causes the limiting rod 233 to move away from the second rotating member 230 or has a tendency to move away from the second rotating member 230. The elastic force of the third elastic element 235 is greater than the elastic force of the first elastic element 223.

[0064] Specifically, the portion of the limiting rod 233 that enters the first limiting groove 224 is designed as an inclined structure. With the hook 200 in the open state, the limiting rod 233, under the elastic force of the third elastic element 235, enters the first limiting groove 224, restricting the relative rotation of the first rotating member 220 and the second rotating member 230. At this time, because the elastic force of the third elastic element 235 is greater than the elastic force of the first elastic element 223, the first rotating member 220 cannot overcome the elastic force of the third elastic element 235 to break free from the limitation of the limiting rod 233 and rotate.

[0065] The lifting device moves downwards in the first region under the weight of the load, exerting a force on the first rotating member 220. The portion of the limiting rod 233 that enters the first limiting groove 224 is an inclined structure. When the force exerted on the first rotating member 220 by the lifting device reaches a certain level, it overcomes the elastic force of the third elastic member 235, causing the first rotating member 220 to push the limiting rod 233 along the inclined surface, thus causing the limiting rod 233 to compress the third elastic member 235. The limiting rod 233 is gradually squeezed out of the first limiting groove 224, thereby releasing the restriction on the relative rotation of the first rotating member 220 and the second rotating member 230.

[0066] When the hook 200 is in the closed state, the first rotating member 220 and the second rotating member 230 rotate relative to each other, the first limiting groove 224 and the second limiting groove 234 move away from each other, and the limiting rod 233 and the third elastic member 235 are located in the second limiting groove 234.

[0067] After the hoisting work is completed, when the first rotating component 220 returns to its initial relative position, the elastic force of the third elastic component 235 is released, pushing the limiting rod 233 to rebound. The limiting rod 233 then re-enters the first limiting groove 224, causing the hook 200 to return to the open state.

[0068] Therefore, by setting the third elastic element 235, the first rotating element 220 cannot overcome the elastic force of the third elastic element 235 to disengage the limiting rod 233 from the first limiting groove 224 when there is no sufficient external force, thereby effectively limiting the relative rotation of the first rotating element 220 and the second rotating element 230 and ensuring the stability of the hook 200 in its initial state.

[0069] Meanwhile, by designing the portion of the limiting rod 233 that enters the first limiting groove 224 as an inclined structure, the downward force of the lifting device and the mechanical properties of the inclined surface are utilized to release the restriction of the limiting rod 233 without additional complex operations, allowing the hook 200 to smoothly enter the working state. When the first rotating component 220 and the second rotating component 230 return to their initial positions, the third elastic component 235 automatically resets the limiting rod 233, causing the hook 200 to automatically return to the open state, thus improving work efficiency.

[0070] In one embodiment, such as Figures 5-10 As shown, in order to better reduce the stress in the vulnerable area, the second rotating member 230 and the connecting member 210 are rotatably connected. When in the closed state, the angle of the positive rotation of the second rotating member 230 and the magnitude of the force between the protrusion 222 and the slot 211 are positively correlated.

[0071] Specifically, when in the open state, the lifting device moves downward in the first area under the action of the weight of the object, causing the first rotating component 220 to rotate until the protrusion 222 is engaged in the slot 211. The lifting device does not contact the second rotating component 230, and the second rotating component 230 and the connecting component 210 do not rotate relative to each other.

[0072] After the hook 200 enters the closed state, the lifting device continues to move downward in the first area. Since the protrusion 222 has been engaged in the slot 211, and the second rotating member 230 and the connecting member 210 are rotatably connected, the continued downward movement of the lifting device will contact the second rotating member 230, causing the second rotating member 230 to begin rotating in the forward direction. The forward movement is... Figure 6 Clockwise. As the lifting device continues to descend, the rotation angle of the second rotating component 230 increases continuously. When the second rotating component 230 rotates to a certain angle, the structural interference between the protrusion 222 and the slot 211 prevents the second rotating component 230 from continuing to rotate.

[0073] The rotational connection between the second rotating member 230 and the connecting member 210 increases the force exerted by the protrusion 222 on the slot 211. This causes more stress in the vulnerable area to be distributed at the connection between the protrusion 222 and the slot 211. Therefore, the rotation of the second rotating member 230 increases the stress at the connection between the protrusion 222 and the slot 211, significantly reducing the stress on the vulnerable area and effectively extending the service life of the hook 200.

[0074] In other embodiments, the second rotating member 230 and the connecting member 210 are fixedly connected. In this case, when the hook 200 is loading the lifting device, the open state is the same as the open state described above. When it is in the closed state, the lifting device continues to move downward in the first area until it contacts the second rotating member 230, and the second rotating member 230 and the connecting member 210 do not move relative to each other.

[0075] In one embodiment, such as Figures 5-10 As shown, in order to prevent the protrusion 222 from over-fitting with the slot 211, a rotating groove 212 is provided on the connector 210, and a rotating block 232 is provided on the second rotating member 230. The rotating block 232 is located in the rotating groove 212. The rotating block 232 and the rotating groove 212 are used to limit the rotation amplitude of the second rotating member 230.

[0076] Specifically, the boundary of the rotating groove 212 on the connector 210 forms a clear physical constraint on the movement of the second rotating member 230, thereby precisely limiting the rotation range of the second rotating member 230.

[0077] When the force of the weight acts on the second rotating member 230, the second rotating member 230 rotates in the forward direction, and the rotating block 232 fixed on the second rotating member 230 moves in the forward direction from the initial position along with the second rotating member 230.

[0078] When the force of the heavy object is large, when the rotating block 232 abuts against the boundary of the rotating groove 212, the boundary of the rotating groove 212 generates a blocking force, which effectively hinders the further movement of the rotating block 232, thereby preventing the second rotating component 230 from continuing to rotate, causing the protrusion 222 and the slot 211 to overfit.

[0079] After the heavy object hoisting operation is completed, the rotating block 232 is moved in the opposite direction in the rotating groove 212 by external force until it returns to the initial position.

[0080] Therefore, by limiting the rotation range of the second rotating component 230, it is ensured that the protrusion 222 and the slot 211 always maintain a reasonable fit, thus avoiding loosening of the hook 200 or damage to the components due to excessive rotation.

[0081] In other embodiments, when there is no limitation on the relative rotation of the second rotating member 230 and the connecting member 210, the friction between the second rotating member 230 and the connecting member 210 can offset part of the force of the weight.

[0082] When the hook 200 is in the initial state, the second rotating member 230 and the connecting member 210 are relatively stationary due to the initial friction between them.

[0083] When the lifting device drives the second rotating component 230 to start rotating relative to the connecting component 210, friction is generated between the second rotating component 230 and the connecting component 210. The direction of this friction is opposite to the rotation direction of the second rotating component 230, which can offset part of the force transmitted by the load through the lifting device.

[0084] After the lifting operation is completed, the lifting device moves upward, causing the first rotating component 220 to rotate in the opposite direction. An external force then causes the second rotating component 230 to rotate in the opposite direction relative to the connecting component 210, returning it to its initial position.

[0085] In one embodiment, such as Figures 5-10 As shown, in order to reduce the adverse effects of the instantaneous force of the weight on the hook 200, a second elastic element 231 is provided at the connection between the second rotating element 230 and the connecting element 210. The elastic force of the second elastic element 231 always causes the second rotating element 230 to rotate in the opposite direction or has a tendency to rotate in the opposite direction.

[0086] Specifically, when a heavy object is placed on the second rotating component 230, the weight of the object will act directly on the second rotating component 230 instantaneously. At this time, the second elastic component 231 can effectively buffer the impact of the weight of the object on the second rotating component 230.

[0087] When the second rotating component 230 rotates in the forward direction due to the gravity of the object, it will cause the second elastic component 231 to undergo torsional deformation. During the deformation process, the second elastic component 231 will store elastic potential energy and generate elastic torque that is opposite to the rotation trend caused by the gravity of the object. This elastic torque can offset the instantaneous force of the object to a certain extent, reduce the impact force on the second rotating component 230 caused by the object, and thus achieve a buffering effect.

[0088] Thus, through the buffering effect of the second elastic element 231, the instantaneous impact force borne by the second rotating element 230 is greatly reduced, effectively avoiding damage to the second rotating element 230 due to excessive impact force.

[0089] In one embodiment, such as Figures 5-10As shown, the rotation of the second rotating member 230 will cause the rotation center of the first rotating member 220 to change. When the first rotating member 220 and the second rotating member 230 rotate at the same time or the second rotating member 230 rotates first, the protrusion 222 will deviate from the predetermined movement trajectory and the relative position with the slot 211 will deviate. At this time, external force intervention is required to make the protrusion 222 snap into the slot 211.

[0090] In order to ensure that the protrusion 222 is accurately engaged in the slot 211, the elastic force of the second elastic member 231 is greater than that of the first elastic member 223, so that when in the open state, the second rotating member 230 and the connecting member 210 do not rotate relative to each other.

[0091] Specifically, when a heavy object is placed, the weight of the object drives the first rotating member 220 and the second rotating member 230 to rotate via the lifting device. Since the elastic force of the second elastic member 231 is greater than that of the first elastic member 223, the first elastic member 223 is more likely to deform under the same external force. Therefore, when in the open state, the first rotating member 220 rotates toward the connecting member 210, while the second rotating member 230 and the connecting member 210 do not rotate relative to each other.

[0092] In the open state, the first rotating member 220 rotates first to ensure that the protrusion 222 is engaged in the slot 211 according to a predetermined trajectory and angle. During the rotation of the first rotating member 220, the protrusion 222 gradually approaches the slot 211. At this time, the second rotating member 230 has not yet rotated or has only rotated slightly, so it will not interfere with the relative position of the protrusion 222 and the slot 211, thereby increasing the possibility of the protrusion 222 being accurately engaged in the slot 211.

[0093] This allows the protrusion 222 to be precisely engaged in the slot 211, reducing the need for external force adjustment due to inaccurate engagement and improving the efficiency of hook 200 installation and lifting operations.

[0094] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0095] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A lifting device for civil construction, characterized in that, include: A hook, comprising a connector, a first rotating member, and a second rotating member disposed along a first plane, wherein one end of the second rotating member is connected to the connector, and the other end of the second rotating member is rotatably connected to the first rotating member, and the first rotating member is capable of rotating within the first plane; The hook has an open state and a closed state during use. When it is in the open state, the first rotating member does not contact the connecting member; when it is in the closed state, the first rotating member abuts against the connecting member and exerts a force on the connecting member. The first rotating member has a protrusion at the end away from the second rotating member, and the connecting member has a groove that mates with the protrusion. When in the closed state, the protrusion is engaged with the groove. The first rotating member is rotatably connected to the second rotating member through a first elastic member. The elastic force of the first elastic member always causes the first rotating member to rotate toward the connecting member or has a tendency to rotate. The second rotating member is provided with a limiting rod, which is used to limit the rotation of the first rotating member when the hook is not in use; a third elastic member is provided between the limiting rod and the second rotating member, and the elastic force of the third elastic member always causes the limiting rod to move away from the second rotating member or has a tendency to move away from the second rotating member, and the elastic force of the third elastic member is greater than the elastic force of the first elastic member; The second rotating member and the connecting member are rotatably connected. When in the closed state, the angle of the second rotating member's forward rotation is positively correlated with the magnitude of the force between the protrusion and the slot.

2. The lifting equipment for civil construction according to claim 1, characterized in that, The hook has a first area for loading lifting equipment inside. The first rotating member is provided with a toggle plate in the first area. The toggle plate rotates in the forward direction, causing the first rotating member to enter a closed state from an open state. When in the closed state, the toggle plate contacts the second rotating member, and the first rotating member contacts the connecting member.

3. The lifting equipment for civil construction according to claim 1, characterized in that, The connector is provided with a rotating groove, and the second rotating component is provided with a rotating block. The rotating block is located in the rotating groove, and the rotating block and the rotating groove are used to limit the rotation range of the second rotating component.

4. The lifting equipment for civil construction according to claim 3, characterized in that, A second elastic element is provided at the connection between the second rotating member and the connecting member. The elastic force of the second elastic element always causes the second rotating member to rotate in the opposite direction or has a tendency to rotate in the opposite direction.

5. A lifting device for civil construction according to claim 4, characterized in that, The elastic force of the second elastic element is greater than that of the first elastic element, so that when in the open state, the second rotating element and the connecting element do not rotate relative to each other.

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