Hoisting equipment for civil construction

Abstract

The invention provides hoisting equipment for civil construction, which comprises a lifting hook, the lifting hook comprises a connecting piece, a first rotating piece and a second rotating piece which are arranged in a first plane, 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 lifting hook has an open state and a closed state during use, and the first rotating piece is not in contact with the connecting piece when the lifting hook is in the open state; in the closed state, the first rotating piece abuts against the connecting piece, and the first rotating piece exerts acting force on the connecting piece. Therefore, the lifting hook is divided into the connecting piece, the first rotating piece and the second rotating piece, when the lifting hook is used, the first rotating piece is in contact with the connecting piece to change the stress concentration position, the maximum stress borne by the lifting hook is reduced, and the service life of the lifting hook is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of construction engineering, in particular to a hoisting device for civil construction. BACKGROUND

[0002] In the modern civil housing construction engineering construction process, the hoisting device as the key vertical transportation equipment undertakes the important task of lifting various building materials, components and construction tools. From lifting steel bars and templates in the foundation construction stage, to transporting prefabricated concrete components during the main structure construction, to carrying decoration materials during the decoration stage.

[0003] CN112723142A discloses a hook for a crane that can prevent unhooking, comprising 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 arranged on the first mounting box, the first clamping mechanism is arranged in the second mounting box, and the working end of the first clamping mechanism extends to the outside through both sides of the second mounting box, the second clamping mechanism has two groups, the two groups of second clamping mechanisms are the same in structure, and the two groups of second clamping mechanisms are arranged at the two working ends of the first clamping mechanism, the buffer mechanism has two groups, the two groups of buffer mechanisms are symmetrically arranged in the first mounting box, and the top of the hook body is arranged in the first mounting box.

[0004] However, in the actual use of the conventional hook for a crane including the above-mentioned patent, the hook as the key component directly bearing the load poses a serious threat to the safety performance and service life of the hook due to the large stress concentration area of the hook during lifting. In long-term use, due to the dynamic load caused by large lifting weight, high working frequency and frequent start-stop, damage is easily accumulated in the stress concentration area, leading to fatigue fracture or local failure. SUMMARY

[0005] Therefore, it is necessary to provide a hoisting device for civil construction in view of the problem of large stress leading to damage of the hook in the existing hoisting device for civil construction.

[0006] The above-mentioned purpose is achieved by the following technical solutions: A hoisting device for civil construction, comprising a hook, the hook comprising a connecting piece arranged along a first plane, a first rotating piece and a second rotating piece, one end of the second rotating piece being connected to the connecting piece, the other end of the second rotating piece being rotatably connected to the first rotating piece, and the first rotating piece being capable of rotating in the first plane. The hook has an open state and a closed state in use, in the open state, the first rotating piece does not contact the connecting piece; 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.

[0007] Further, a first area for loading a lifting device is formed inside the hook, the first rotating piece is provided with a pushing piece in the first area, forward rotation of the pushing piece makes the first rotating piece enter the closed state from the open state, in the closed state, the pushing piece contacts the second rotating piece, and the first rotating piece contacts the connecting piece.

[0008] Further, a protrusion is arranged at an end of the first rotating piece away from the second rotating piece, the connecting piece is provided with a clamping groove matched with the protrusion, in the closed state, the protrusion is clamped in the clamping groove.

[0009] Further, the first rotating piece is rotationally connected to the second rotating piece through a first elastic piece, the elastic force of the first elastic piece always makes the first rotating piece rotate towards the connecting piece or has a tendency to rotate towards the connecting piece.

[0010] Further, the second rotating piece is provided with a limiting rod, the limiting rod is used to limit rotation of the first rotating piece when the hook is not used.

[0011] Further, a third elastic piece is arranged between the limiting rod and the second rotating piece, the elastic force of the third elastic piece always makes the limiting rod move away from the second rotating piece or has a tendency to move away from the second rotating piece, and the elastic force of the third elastic piece is greater than the elastic force of the first elastic piece.

[0012] Further, the second rotating piece is rotationally connected to the connecting piece, after the protrusion is clamped in the clamping groove, in the closed state, the angle of forward rotation of the second rotating piece and the force between the protrusion and the clamping groove are in a positive correlation.

[0013] Further, the connecting piece is provided with a rotating groove, the second rotating piece 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 amplitude of the second rotating piece.

[0014] Further, a second elastic piece is arranged at the connection between the second rotating piece and the connecting piece, the elastic force of the second elastic piece always makes the second rotating piece rotate reversely or has a tendency to rotate reversely.

[0015] Further, the elastic force of the second elastic member is greater than the elastic force of the first elastic member, so that the second rotating member and the connecting member do not rotate relative to each other when in the open state.

[0016] The present application has the following advantages: The present application provides a lifting device for civil engineering, comprising: a hook, the hook comprising a connecting member, a first rotating member and a second rotating member arranged along a first plane, one end of the second rotating member being connected to the connecting member, the other end of the second rotating member being rotatably connected to the first rotating member, the first rotating member being able to rotate in the first plane; the hook having an open state and a closed state when in use, when in the open state, the first rotating member does not contact the connecting member; when in the closed state, the first rotating member abuts against the connecting member, and the first rotating member has a force acting on the connecting member. Thus, by dividing the hook into the connecting member, the first rotating member and the second rotating member, the position of stress concentration is changed by the first rotating member contacting the connecting member when in use, the maximum stress borne by the hook is reduced, and the service life of the hook is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A structural schematic diagram of the lifting device for civil engineering provided by an embodiment of the present application is provided; Figure 2 A structural schematic diagram of the hook of the lifting device for civil engineering provided by an embodiment of the present application is provided; Figure 3 A static stress analysis diagram of the hook of the conventional lifting device for civil engineering when lifting a weight is provided; Figure 4 A static stress analysis diagram of the hook of the lifting device for civil engineering provided by an embodiment of the present application is provided; Figure 5 A side view of the hook of the lifting device for civil engineering provided by an embodiment of the present application is provided; Figure 6 A Figure 5 An A-A cross-sectional view of the hook of the lifting device for civil engineering in an open state is provided; Figure 7 A Figure 6 A structural schematic diagram of the hook of the lifting device for civil engineering at position B is provided; Figure 8 A Figure 5 An A-A cross-sectional view of the hook of the lifting device for civil engineering in a closed state is provided; Figure 9 A front exploded view of the hook of the lifting device for civil engineering provided by an embodiment of the present application is provided; Figure 10The back explosion view of the hook of the hoisting equipment for civil construction is provided for an embodiment of the present application.

[0018] Wherein: 100, support; 200, hook; 210, connecting piece; 211, clamping groove; 212, rotating groove; 220, first rotating piece; 221, actuating piece; 222, protruding block; 223, first elastic piece; 224, first limiting groove; 230, second rotating piece; 231, second elastic piece; 232, rotating block; 233, limiting rod; 234, second limiting groove; 235, third elastic piece; 300, slide rail force arm. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below with examples and in conjunction with the drawings. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0020] The serial numbers of components in this paper, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequence or technical meaning. And the "connection" and "coupling" in the present application include direct and indirect connection (coupling) unless otherwise specified. In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0021] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0022] The following refers to Figures 1-10 The hoisting equipment for civil construction is described.

[0023] The hoisting device for civil construction provided by the embodiment of the present application is particularly suitable for hoisting building materials in the construction process of high-rise buildings and other main body structures. Of course, the hoisting device for civil construction can also be applied to hoisting heavy objects in other construction engineering scenarios.

[0024] Specifically, as shown in the figure, Figure 1 The hoisting device for civil construction includes a support 100, a sliding rail force arm 300, and a hook 200. The support 100 is fixedly installed on the ground or other solid fixed platform as the stable foundation of the hoisting device for civil construction. The sliding rail force arm 300 is stably connected to one end of the support 100 to realize the positioning of the hook 200 between different positions, and the sliding rail force arm 300 provides displacement support in the horizontal direction for the hoisting operation. The hook 200 is suspended below the other end of the sliding rail force arm 300 to hoist heavy objects. The hook 200 is driven by the sliding rail force arm 300 to complete the hoisting and transferring of various building materials and components. When heavy objects need to be transported, the heavy objects are first hung on the hook 200 by a lifting tool, so that the heavy objects move with the hook 200, and when the destination is reached, the lifting tool is removed from the hook 200, and then the heavy objects are removed.

[0025] In order to reduce the damage caused by stress, as shown in the figure, Figures 2-4 The hook 200 includes a connecting piece 210, a first rotating piece 220, and a second rotating piece 230 arranged along a first plane. One end of the second rotating piece 230 is connected to the connecting piece 210, and the other end of the second rotating piece 230 is rotatably connected to the first rotating piece 220. The first rotating piece 220 can rotate in the first plane.

[0026] The hook 200 has an open state and a closed state when in use. In the open state, the first rotating piece 220 does not contact the connecting piece 210. In the closed state, the first rotating piece 220 abuts against the connecting piece 210, and the first rotating piece 220 has a force acting on the connecting piece 210.

[0027] Specifically, when the lifting tool is hung on the hook 200, the first rotating piece 220 rotates under the action of the gravity of the hoisted object and contacts the connecting piece 210, and the connecting piece 210 is subjected to the force of the first rotating piece 220. Before and after the rotation of the first rotating piece 220, the hook 200 has corresponding open and closed states. In the open state, the first rotating piece 220 does not contact the connecting piece 210. In the closed state, the first rotating piece 220 contacts the connecting piece 210.

[0028] An external load of 100N is applied to the hook 200, and the direction of the force is downward. The static stress analysis of the conventional hook 200 is as shown in the figure. Figure 3As 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Thus, the force generated by the gravity of the heavy object on the lifting hook makes the lifting hook move downward in the first region while driving the actuating piece 221 to move forward to complete the rotation of the first rotating piece 220.

[0036] In one embodiment, as shown in Figures 5-10 In order to better disperse the stress of the vulnerable area, a protrusion 222 is arranged at the end of the first rotating piece 220 away from the second rotating piece 230, and a clamping groove 211 is arranged on the connecting piece 210 to cooperate with the protrusion 222. When in the closed state, the protrusion 222 is clamped in the clamping groove 211.

[0037] Specifically, when in the open state, the first rotating piece 220 rotates towards the connecting piece 210, and the protrusion 222 approaches the clamping groove 211 with the rotation of the first rotating piece 220. When in the closed state, the first rotating piece 220 and the connecting piece 210 are in full abutment, and the protrusion 222 is clamped in the clamping groove 211.

[0038] Because when a force acts on a structure with a certain shape and connection mode, the force will be redistributed along the contact interface according to the size of the contact area. Therefore, the clamping relationship between the protrusion 222 and the clamping groove 211 makes the stress of the vulnerable area of the lifting hook 200 more dispersed to the contact surface of the protrusion 222 and the clamping groove 211.

[0039] Thus, by the cooperation of the protrusion 222 and the clamping groove 211, the stress originally concentrated on a small contact surface is dispersed to a larger contact area, effectively reducing the stress of the vulnerable area and reducing the risk of damage to the lifting hook 200 due to excessive stress. At the same time, the clamping mode of the protrusion 222 and the clamping groove 211 enhances the connection strength between the first rotating piece 220 and the connecting piece 210, making the lifting hook 200 more stable when bearing external force.

[0040] In one embodiment, as shown in Figures 5-10 In order to ensure that the first rotating piece 220 can still contact the connecting piece 210 when the heavy object is being lifted and is disturbed by external force or vibration, the first rotating piece 220 is rotatably connected to the second rotating piece 230 by a first elastic member 223, and the elastic force of the first elastic member 223 always makes the first rotating piece 220 rotate towards the connecting piece 210 or has a tendency to rotate.

[0041] Specifically, before lifting the heavy object, the hook 200 is in the initial state, and the first rotating member 220 is rotated to abut against the connecting member 210 under the action of the first elastic member 223. When placing the lifting tool, the elastic force of part of the first elastic member 223 is offset by external force, so that the first rotating member 220 is away from the connecting member 210, and the hook 200 is in the open state. The lifting tool is placed in the first region of the hook 200, and after the external force is removed, the first rotating member 220 is rotated towards the connecting member 210 until the protrusion 222 is clamped into the clamping groove 211, and enters the closed state.

[0042] In the process of lifting the heavy object, when there is no external force interference or vibration, the first rotating member 220 is stably kept in contact with the connecting member 210 by the clamping of the protrusion 222 and the clamping groove 211 and the elastic force of the first elastic member 223. When the hook 200 is interfered by external force or vibration, the elastic force of the first elastic member 223 can offset part of the external force, so that the first rotating member 220 always keeps in contact with the connecting member 210 or quickly recovers to the state of being in contact with the connecting member 210.

[0043] Therefore, by the elastic force generated by the stress deformation of the first elastic member 223, the connection stability between the first rotating member 220 and the connecting member 210 is enhanced.

[0044] In one embodiment, as shown in Figures 5-10 In order to make the hook 200 in the initial state be in the open state, a limiting rod 233 is arranged on the second rotating member 230.

[0045] Specifically, a first limiting groove 224 is arranged on the first rotating member 220, and a second limiting groove 234 matched with the first limiting groove 224 is arranged on the second rotating member 230.

[0046] When the hook 200 is in the open state, the limiting rod 233 is placed in the first limiting groove 224 and the second limiting groove 234, so that the first rotating member 220 and the second rotating member 230 are limited and cannot relatively rotate. When the lifting tool is placed in the first region of the hook 200, the limiting rod 233 is separated from the first limiting groove 224, and the limitation on the relative rotation of the first rotating member 220 and the second rotating member 230 is removed. After the use of the hook 200 is completed, the limiting rod 233 is placed in the first limiting groove 224 and the second limiting groove 234, so that the hook returns to the open state.

[0047] Therefore, when the lifting tool is placed in the initial state of the hook 200, the hook 200 is in the open state.

[0048] In one embodiment, as shown in Figures 5-10As shown, in order to improve the working efficiency of the hook 200, a third elastic member 235 is arranged between the limiting rod 233 and the second rotating member 230, and the elastic force of the third elastic member 235 always makes the limiting rod 233 move away from the second rotating member 230 or has a tendency to move away from the second rotating member 230, and the elastic force of the third elastic member 235 is greater than the elastic force of the first elastic member 223.

[0049] Specifically, the part of the limiting rod 233 entering the first limiting groove 224 is designed as a slope structure. When the hook 200 is in an open state, the limiting rod 233 enters the first limiting groove 224 under the elastic force of the third elastic member 235, and the relative rotation of the first rotating member 220 and the second rotating member 230 is limited. At this time, since the elastic force of the third elastic member 235 is greater than the elastic force of the first elastic member 223, the first rotating member 220 cannot rotate to overcome the elastic force of the third elastic member 235 to escape from the limitation of the limiting rod 233.

[0050] When the lifting appliance moves downward in the first area under the gravity of the heavy object, an acting force is generated on the first rotating member 220. The part of the limiting rod 233 entering the first limiting groove 224 is designed as a slope structure, and when the force applied by the lifting appliance on the first rotating member 220 reaches a certain degree, the elastic force of the third elastic member 235 is overcome, so that the first rotating member 220 pushes the limiting rod 233 along the slope, and the limiting rod 233 is pressed by the third elastic member 235. The limiting rod 233 is gradually extruded out of the first limiting groove 224, thereby removing the limitation on the relative rotation of the first rotating member 220 and the second rotating member 230.

[0051] When the hook 200 is in a closed state, the first rotating member 220 and the second rotating member 230 rotate relatively, 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.

[0052] When the first rotating member 220 returns to the initial relative position after the lifting work is completed, the elastic force of the third elastic member 235 is released, the limiting rod 233 is pushed to rebound, the limiting rod 233 enters the first limiting groove 224 again, and the hook 200 returns to the open state.

[0053] Therefore, by arranging the third elastic member 235, when there is not enough external force, the first rotating member 220 cannot overcome the elastic force of the third elastic member 235 to make the limiting rod 233 escape from the first limiting groove 224, thereby effectively limiting the relative rotation of the first rotating member 220 and the second rotating member 230, and ensuring the stability of the initial state of the hook 200.

[0054] Meanwhile, by designing the part of the limiting rod 233 entering the first limiting groove 224 as a slope structure, the downward moving force of the lifting tool and the mechanical properties of the slope are utilized to release the limitation of the limiting rod 233 without the help of additional complex operations, so that the lifting hook 200 can smoothly enter the working state. When the first rotating part 220 and the second rotating part 230 return to the initial position, the third elastic part 235 can automatically reset the limiting rod 233, so that the lifting hook 200 automatically recovers to the open state, thereby improving the work efficiency.

[0055] In one embodiment, as shown in Figures 5-10 In order to better reduce the stress of the vulnerable area, the second rotating part 230 and the connecting part 210 are rotationally connected, and when in the closed state, the angle of the positive rotation of the second rotating part 230 and the size of the force between the protrusion 222 and the clamping groove 211 are in a positive correlation.

[0056] Specifically, when in the open state, the lifting tool moves downward in the first area under the gravity of the heavy object, driving the first rotating part 220 to rotate to the protrusion 222 clamped into the clamping groove 211, and the lifting tool does not contact the second rotating part 230, and the second rotating part 230 and the connecting part 210 do not relatively rotate.

[0057] After the lifting hook 200 enters the closed state, the lifting tool continues to move downward in the first area, and since the protrusion 222 has been clamped into the clamping groove 211 and the second rotating part 230 and the connecting part 210 are rotationally connected, the continued downward movement of the lifting tool will contact the second rotating part 230, prompting the second rotating part 230 to start positive rotation, and the positive movement is Figure 6 the clockwise direction. With the continuous downward movement of the lifting tool, the rotation angle of the second rotating part 230 continuously increases, and when the second rotating part 230 rotates to a certain angle, the structural interference between the protrusion 222 and the clamping groove 211 makes the second rotating part 230 unable to continue to rotate.

[0058] Due to the rotational connection between the second rotating part 230 and the connecting part 210, the force of the protrusion 222 on the clamping groove 211 is increased, so that the stress of the vulnerable area is more dispersed to the connection between the protrusion 222 and the clamping groove 211. Therefore, by rotating the second rotating part 230, the stress at the connection between the protrusion 222 and the clamping groove 211 is increased, the stress of the vulnerable area is greatly reduced, and the service life of the lifting hook 200 is effectively prolonged.

[0059] In other embodiments, the second rotating part 230 and the connecting part 210 are fixedly connected. At this time, when the lifting hook 200 is loaded with the lifting tool, the open state is the same as the above open state, and when in the closed state, the lifting tool continues to move downward in the first area to contact the second rotating part 230, and the second rotating part 230 and the connecting part 210 do not relatively move.

[0060] In one embodiment, as shown in FIG. 2, a rotating groove 212 is provided on the connecting member 210, and a rotating block 232 is provided on the second rotating member 230, the rotating block 232 being located in the rotating groove 212, and the rotating block 232 and the rotating groove 212 being used to limit the rotating range of the second rotating member 230. Figures 5-10

[0061] Specifically, the boundary of the rotating groove 212 on the connecting member 210 forms a clear physical constraint on the movement of the second rotating member 230, and thus precisely limits the rotating range of the second rotating member 230.

[0062] When the force of the weight acts on the second rotating member 230, the second rotating member 230 rotates forward, and the rotating block 232 fixed on the second rotating member 230 moves forward from the initial position along with the second rotating member 230.

[0063] When the force of the weight is large, the rotating block 232 abuts against the boundary of the rotating groove 212, and 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 member 230 from continuing to rotate, and causing the overfitting of the lug 222 and the clamping groove 211.

[0064] After the weight hoisting work is completed, the rotating block 232 is moved reversely in the rotating groove 212 by an external force until it returns to the initial position.

[0065] Thus, by limiting the rotating range of the second rotating member 230, it is ensured that the lug 222 and the clamping groove 211 always maintain a reasonable fitting relationship, and the loosening of the lifting hook 200 or the damage of the components caused by over-rotation is avoided.

[0066] In other embodiments, when the second rotating member 230 and the connecting member 210 have no limit on the relative rotating range, the friction between the second rotating member 230 and the connecting member 210 can offset part of the force of the weight.

[0067] When the lifting hook 200 is in the initial state, the second rotating member 230 and the connecting member 210 are relatively static due to the initial friction therebetween.

[0068] When the lifting tool starts to rotate the second rotating member 230 relative to the connecting member 210, the friction between the second rotating member 230 and the connecting member 210 is generated, and the direction of the friction is opposite to the rotating direction of the second rotating member 230, and the friction can offset part of the force of the weight transmitted through the lifting tool.

[0069] ​After the heavy lifting work is completed, the lifting tool moves upward to drive the first rotating part 220 to rotate reversely. The second rotating part 230 is reversely rotated relative to the connecting part 210 by an external force to return to the initial position.

[0070] In one embodiment, as shown in the figure, in order to reduce the adverse effects of the instantaneous action of the weight gravity on the lifting hook 200, a second elastic member 231 is arranged at the connection between the second rotating part 230 and the connecting part 210. The elastic force of the second elastic member 231 always reversely rotates or has a tendency to reversely rotate the second rotating part 230. Figures 5-10

[0071] Specifically, when the weight is placed on the second rotating part 230, the gravity of the weight will directly act on the second rotating part 230 in an instant. At this time, the second elastic member 231 can effectively buffer the impact of the weight gravity on the second rotating part 230.

[0072] When the second rotating part 230 is positively rotated due to the action of the weight gravity, the second elastic member 231 will be twisted and deformed, and in the deformation process, the second elastic member 231 will store elastic potential energy and generate an elastic torque opposite to the rotation tendency caused by the action of the weight gravity. This elastic torque can offset the instantaneous force of the weight to a certain extent, reduce the impact force of the weight on the second rotating part 230, and thus achieve a buffering effect.

[0073] Therefore, through the buffering effect of the second elastic member 231, the instantaneous impact force borne by the second rotating part 230 is greatly reduced, and damage to the second rotating part 230 caused by excessive impact force is effectively avoided.

[0074] In one embodiment, as shown in the figure, the rotation of the second rotating part 230 will change the rotation center of the first rotating part 220. When the first rotating part 220 and the second rotating part 230 rotate simultaneously or the second rotating part 230 rotates first, the protrusion 222 will deviate from the predetermined movement track and deviate from the relative position of the clamping groove 211. At this time, an external force is needed to make the protrusion 222 clamped into the clamping groove 211. Figures 5-10 In order to accurately clamp the protrusion 222 into the clamping groove 211, the elastic force of the second elastic member 231 is greater than the elastic force of the first elastic member 223, so that when the second rotating part 230 is in an open state, the second rotating part 230 and the connecting part 210 do not rotate relative to each other.

[0075]

[0076] ​​Specifically, when the heavy object is placed, the gravity of the heavy object drives the first rotating member 220 and the second rotating member 230 to rotate through the lifting tool. Since the elastic force of the second elastic member 231 is greater than the elastic force of the first elastic member 223, the first elastic member 223 is more likely to deform under the same external force, so that the first rotating member 220 rotates towards the connecting member 210 in the open state, and the second rotating member 230 and the connecting member 210 do not rotate relative to each other.

[0077] In the open state, the first rotating member 220 rotates first to ensure that the protrusion 222 is clamped into the clamping groove 211 according to a predetermined trajectory and angle. During the rotation of the first rotating member 220, the protrusion 222 gradually approaches the clamping groove 211, and at this time the second rotating member 230 has not rotated or has a small rotation amplitude, which does not interfere with the relative position of the protrusion 222 and the clamping groove 211, thereby improving the possibility of accurately clamping the protrusion 222 into the clamping groove 211.

[0078] Therefore, the protrusion 222 can be accurately clamped into the clamping groove 211, reducing the need for external force adjustment due to inaccurate clamping, and improving the efficiency of the installation and lifting operation of the lifting hook 200.

[0079] The technical features of the above embodiments can be combined in any way. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0080] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A hoisting apparatus for civil engineering construction, characterized by The hook comprises a connecting piece, a first rotating piece and a second rotating piece arranged along a first plane, 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, in the open state, the first rotating piece does not contact the connecting piece, and in the closed state, the first rotating piece abuts against the connecting piece and has a force acting on the connecting piece. A first area for loading a sling is formed inside the hook, the first rotating piece is provided with a pushing piece in the first area, forward rotation of the pushing piece makes the first rotating piece enter the closed state from the open state, in the closed state, the pushing piece contacts the second rotating piece and the first rotating piece contacts the connecting piece.

2. The hoisting apparatus for civil engineering work according to claim 1, wherein A protrusion is arranged at the end of the first rotating piece away from the second rotating piece, the connecting piece is provided with a clamping groove matched with the protrusion, in the closed state, the protrusion is clamped in the clamping groove.

3. The hoisting apparatus for civil engineering work according to claim 1, wherein The first rotating piece is rotatably connected to the second rotating piece by a first elastic piece, the elastic force of the first elastic piece always makes the first rotating piece rotate towards the connecting piece or has a tendency to rotate towards the connecting piece.

4. The hoisting apparatus for civil engineering work according to claim 3, wherein The second rotating piece is provided with a limiting rod for limiting rotation of the first rotating piece when the hook is not used.

5. The hoisting apparatus for civil engineering work according to claim 4, wherein A third elastic piece is arranged between the limiting rod and the second rotating piece, the elastic force of the third elastic piece always makes the limiting rod move away from the second rotating piece or has a tendency to move away from the second rotating piece, and the elastic force of the third elastic piece is greater than that of the first elastic piece.

6. The hoisting apparatus for civil engineering work according to claim 5, wherein The second rotating piece is rotatably connected to the connecting piece, in the closed state, the angle of forward rotation of the second rotating piece and the force between the protrusion and the clamping groove are in a positive correlation.

7. The hoisting apparatus for civil engineering work according to claim 6, wherein The connecting piece is provided with a rotating groove, the second rotating piece 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 amplitude of the second rotating piece.

8. The hoisting apparatus for civil engineering work according to claim 7, wherein A second elastic piece is arranged at the connection between the second rotating piece and the connecting piece, the elastic force of the second elastic piece always makes the second rotating piece rotate reversely or has a tendency to rotate reversely.

9. The hoisting apparatus for civil engineering work according to claim 8, wherein The elastic force of the second elastic piece is greater than that of the first elastic piece, so that in the open state, the second rotating piece and the connecting piece do not rotate relatively.

10. The hoisting apparatus for civil engineering work according to claim 9, wherein ​

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