Lifting appliance and hoisting equipment

Abstract

The utility model provides a lifting appliance and hoisting equipment, and belongs to the field of cranes. The lifting appliance comprises a flexible rigging, a connecting piece and a lifting appliance head, the lifting appliance head is provided with a rotating curved surface used for being in rolling fit with the surface of the prefabricated part, a sliding groove is formed in the rotating curved surface, the width of a groove opening part of the sliding groove is smaller than that of the groove bottom of the sliding groove, and the lifting appliance head has a hanging state before rolling on the prefabricated part and a connecting state after rolling on the prefabricated part. The hoisting equipment comprises a hoisting sling and a sling connected to the lower end of the hoisting sling. The lifting appliance head can roll on the prefabricated part under the traction of the flexible rigging and the connecting piece, and the head of the lifting nail enters the sliding groove after rolling, so that automatic connection of the lifting appliance and the lifting nail is completed, and the lifting safety of the prefabricated part is improved.

Description

Technical Field

[0001] The utility model belongs to the field of cranes, and particularly relates to a spreader and a lifting device. Background Art

[0002] During the process of tunnel boring construction using an open-type hard rock tunneling machine (TBM), it is necessary to synchronously lay inverted arch precast blocks at the bottom of the tunnel to facilitate the laying of tracks for the follow-up system to travel. The inverted arch precast blocks are transported into the tunnel by a material transport vehicle and then hoisted and laid by a crane in the tunnel.

[0003] Generally, lifting nails are buried in concrete precast components such as inverted arch precast blocks. Before hoisting, it is necessary to connect the spreader on the lifting sling of the equipment installed therein to the lifting nail. The Chinese utility model patent with the authorized announcement number CN210393395U discloses a spreader for lifting nails of precast components and a spreader assembly. The background art part thereof records a duckbill spreader for hoisting precast components. The duckbill spreader includes a rotatable spreader head. An arc-shaped groove is provided at the bottom of the spreader head. The notch of the arc-shaped groove is narrow and the bottom of the groove is wide. The width of the notch of the arc-shaped groove is smaller than the diameter of the head of the lifting nail, and the width of the bottom of the arc-shaped groove is greater than or equal to the diameter of the head of the lifting nail. After the head of the lifting nail enters the arc-shaped groove, it cannot escape from the notch of the arc-shaped groove. One end in the length direction of the arc-shaped groove is provided with an inlet for the head of the lifting nail to enter the arc-shaped groove. After the head of the lifting nail enters the arc-shaped groove from the inlet, rotate the spreader head so that the head of the lifting nail slides along the arc-shaped groove to the other end to start the hoisting work. A convex block is also provided on the spreader head. The convex block can be used as an operating handle for manually rotating the spreader head and can also adjust the center of gravity of the spreader head.

[0004] The above duckbill spreader needs to be installed manually. The operator needs to hold the spreader head and place the inlet on the spreader head downward in the spherical pit on the precast component. During this process, it is necessary to make the head of the lifting nail pass through the inlet and enter the arc-shaped groove. After that, the operator also needs to manually rotate the spreader head. The spreader head rotates in the pit, and the head of the lifting nail reaches the other end of the arc-shaped groove so that the spreader head is in a state where it can be hoisted. The above operations require the operator to be under the crane for a long time, which poses a great safety hazard. Summary of the Utility Model

[0005] One of the purposes of the present utility model is to provide a spreader to solve the technical problem of large safety hazards existing in the prior art that the operator needs to manually connect the spreader to the lifting nail before hoisting the precast component.

[0006] Another purpose of the present utility model is to provide a lifting device to solve the above technical problem.

[0007] To achieve the above purpose, the technical solution of the spreader provided by the present utility model is:

[0008] A lifting device includes a connecting member and a lifting head rotatably fitted with the connecting member. The lifting head has a rotating surface for rolling cooperation with the surface of a precast member. A chute extending along the circumferential direction of the rotating surface is formed on the rotating surface. The width of the notch of the chute is smaller than the width of the bottom of the chute. The lifting device further includes a flexible sling. One end of the flexible sling is connected to the connecting member, and the other end is an installation end for being installed on the lifting sling of a lifting device. During use, the lifting head can roll under the driving action of the flexible sling to generate a suspended state before rolling and a connected state after rolling. The rolling axis of the lifting head is parallel to the rotation axis of the lifting head relative to the connecting member. One end of the lifting head in the extending direction of the chute is provided with an inlet communicating with the chute. The inlet is used to capture the head of the lifting nail at the center of the pit of the precast member during the process of the lifting head switching from the suspended state to the connected state. When in the suspended state, the end of the chute where the inlet is located is higher than the other end of the chute. When in the connected state, the inlet faces downward.

[0009] As a further improvement, the flexible sling is a ring chain.

[0010] As a further improvement, the flexible sling is a transmission chain. A single link of the transmission chain includes two chain plates and a chain shaft arranged between the two chain plates. The chain shaft is located at one end of the chain plate, and a mating hole for rotatably cooperating with the chain shaft of an adjacent link is provided at the other end of the chain plate.

[0011] As a further improvement, the flexible sling is a lifting belt.

[0012] As a further improvement, the rotating surface is a spherical surface.

[0013] As a further improvement, the rotating surface is a straight cylindrical surface.

[0014] As a further improvement, the lifting head includes a main body portion and a flat convex portion protruding from the main body portion. When the lifting head is in the suspended state, the convex portion is located above the main body portion. When the lifting head is in the connected state, the convex portion is on the horizontal side of the main body portion.

[0015] As a further improvement, the connecting member includes a connecting frame and a rotating shaft fixed to the connecting frame. One end of the connecting frame is connected to the flexible sling, and the other end of the connecting frame is a fork-shaped structure with two connecting arms and the rotating shaft is located between the two connecting arms. A mating hole for rotatably cooperating with the rotating shaft is provided on the lifting head, and the axis of the mating hole is the rotation center of the lifting head.

[0016] As a further improvement, mating planes for fitting with the inner sides of the connecting arms are provided on both sides of the lifting head, and both ends of the mating hole penetrate through the two mating planes respectively.

[0017] The beneficial effects are as follows: The sling provided by the present utility model belongs to an improved invention. A flexible sling is connected to the connecting member of the sling. The flexible sling can provide a pulling force to the connecting member of the sling, causing the connecting member to deflect laterally, thereby applying a force to the upper part of the sling head on the upper surface of the prefabricated component. There is a frictional force between the bottom of the sling head and the upper surface of the prefabricated component. Therefore, the sling head can have a rolling tendency. At the same time, the flexible sling can also deform freely and does not affect the free rolling of the sling head. Therefore, the sling head can roll under the driving action of the flexible sling. The sling head switches from the suspended state to the connected state by rolling. During this process, on the one hand, the sling head will roll into the pit of the prefabricated component, and on the other hand, the inlet on the sling head will capture the head of the lifting nail, so that the head of the lifting nail reaches the bottom of the chute. When the sling head is pulled up, the sling head will rotate in place in the pit, and at the same time, the head of the lifting nail will slide along the chute to the other end away from the inlet, completing the connection between the sling and the lifting nail. The sling in the present utility model can connect the sling and the lifting nail without manual operation by the operator before lifting, so that the operator does not need to work under the lifting equipment, greatly improving the safety of the lifting stage of prefabricated component hoisting.

[0018] To achieve the above object, the technical solution of the lifting equipment provided by the present utility model is:

[0019] A lifting equipment, comprising a lifting sling and a sling connected to the lower end of the lifting sling. The sling includes a connecting member and a sling head rotatably engaged with the connecting member. The sling head has a rotating surface for rolling cooperation with the surface of the prefabricated component. A chute extending along the circumferential direction of the rotation of the rotating surface is provided on the rotating surface. The width of the chute opening is smaller than the width of the chute bottom. The sling further includes a flexible sling. One end of the flexible sling is connected to the connecting member, and the other end is an installation end for being installed on the lifting sling of the lifting equipment. During use, the sling head can roll under the driving action of the flexible sling to generate a suspended state before rolling and a connected state after rolling. The rolling axis of the sling head is parallel to the rotation axis of the sling head relative to the connecting member. One end of the sling head in the extending direction of the chute is provided with an inlet communicating with the chute. The inlet is used to capture the head of the lifting nail at the center of the pit of the prefabricated component during the process of the sling head switching from the suspended state to the connected state. When in the suspended state, the end of the chute where the inlet is located is higher than the other end of the chute. When in the connected state, the inlet faces downward.

[0020] As a further improvement, the flexible sling is a ring chain.

[0021] As a further improvement, the flexible sling is a transmission chain. A single link of the transmission chain includes two chain plates and a chain shaft arranged between the two chain plates. The chain shaft is located at one end of the chain plate, and a mating hole for rotatably engaging with the chain shaft of the adjacent link is provided at the other end of the chain plate.

[0022] As a further improvement, the flexible rigging is a sling.

[0023] As a further improvement, the rotating surface is a spherical surface.

[0024] As a further improvement, the rotating surface is a straight cylindrical surface.

[0025] As a further improvement, the sling head includes a main body part and a flat convex part protruding from the main body part. When the sling head is in the suspended state, the convex part is located above the main body part, and when the sling head is in the connected state, the convex part is on the horizontal side of the main body part.

[0026] As a further improvement, the connecting member includes a connecting frame and a rotating shaft fixed to the connecting frame. One end of the connecting frame is connected to the flexible rigging, the other end of the connecting frame is a fork-shaped structure with two connecting arms, and the rotating shaft is located between the two connecting arms. A mating hole that rotates in cooperation with the rotating shaft is provided on the sling head, and the axis of the mating hole is the rotation center of the sling head.

[0027] As a further improvement, mating planes for fitting with the inner sides of the connecting arms are provided on both sides of the sling head, and both ends of the mating hole penetrate through the two mating planes respectively.

[0028] The beneficial effects are as follows: The lifting equipment provided by the present utility model belongs to an improved invention. A flexible rigging is connected to the connecting member of the sling in this lifting equipment. The flexible rigging can provide a pulling force to the connecting member of the sling, causing the connecting member to laterally shift, thereby applying a force to the upper part of the sling head on the upper surface of the precast component. There is a frictional force between the bottom of the sling head and the upper surface of the precast component, so the sling head can have a tendency to roll; at the same time, the flexible rigging can also freely deform and does not affect the free rolling of the sling head. Therefore, the sling head can roll under the driving action of the flexible rigging. The sling head switches from the suspended state to the connected state by rolling. During this process, on the one hand, the sling head will roll into the pit of the precast component, and on the other hand, the inlet on the sling head will capture the head of the lifting nail, so that the head of the lifting nail reaches the bottom of the chute. When the sling head is pulled up, the sling head will rotate in place in the pit, and at the same time, the head of the lifting nail will slide along the chute to the other end away from the inlet, completing the connection between the sling and the lifting nail. The sling in the present utility model can connect the sling and the lifting nail without manual operation by the operator before lifting, so the operator does not need to work under the lifting equipment, greatly improving the safety of the lifting stage of precast component hoisting. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1 of the sling in the present utility model;

[0030] Figure 2Schematic diagram of the structure of the sling head in Embodiment 1 of the sling in the present utility model;

[0031] Figure 3 Cross-sectional view of the sling head in Embodiment 1 of the sling in the present utility model;

[0032] Figure 4 State diagram of the sling head in Embodiment 1 of the sling in the present utility model at the edge of the pit;

[0033] Figure 5 State diagram of the sling head in Embodiment 1 of the sling in the present utility model located in the pit and in the connected state;

[0034] Figure 6 State diagram of the sling head in Embodiment 1 of the sling in the present utility model located in the pit and in the suspended state.

[0035] Explanation of reference numerals:

[0036] 1. Chain; 2. Sling head; 21. Main body part; 22. Protruding part; 23. Fitting plane; 24. Fitting hole; 25. Chute; 251. Notch part; 252. Bottom part of the chute; 26. Entrance; 3. Connecting piece; 31. Connecting frame; 32. Rotating shaft; 4. Prefabricated part; 5. Pit; 6. Hanging nail; 61. Head of the hanging nail. Detailed implementation manners

[0037] The following further describes the present utility model in detail with reference to embodiments.

[0038] To solve the problems in the prior art, the basic concept of the present utility model is to enable the sling head to roll on the prefabricated part driven by the flexible sling and the connecting piece, and after rolling, make the head of the hanging nail enter the chute to complete the automatic connection of the sling and the hanging nail, improving the safety of lifting the prefabricated part.

[0039] Specific Embodiment 1 of the sling provided by the present utility model:

[0040] A sling, see the attached Figure 1 , including a flexible sling, a connecting piece 3 and a sling head 2. One end of the flexible sling is connected to the connecting piece 3, the other end of the flexible sling is an installation end for installing on a lifting device, and the end of the connecting piece 3 away from the flexible sling is connected to the sling head 2.

[0041] The connecting member 3 includes a connecting frame 31 and a rotating shaft 32 fixed to the connecting frame 31. One end of the connecting frame 31 is hinged to the flexible sling by a pin shaft. The other end of the connecting frame 31 is a fork-shaped structure with two connecting arms, and the rotating shaft 32 is located between the two connecting arms. Specifically, openings for installing the rotating shaft 32 are provided on both connecting arms. One opening is a smooth hole, and the other opening is a threaded hole. The rotating shaft 32 passes through the smooth hole and is in threaded cooperation with the threaded hole. In other embodiments, both ends of the rotating shaft 32 can extend out of the corresponding openings and be connected with nuts or use a retaining pin to prevent the rotating shaft 32 from disengaging. In other embodiments, the rotating shaft 32 can also be directly welded and fixed to the connecting arm.

[0042] See appendix Figure 2 and appendix Figure 3 , the sling head 2 includes a main body portion 21 and a protruding portion 22 protruding from the main body portion 21. The main body portion 21 is spherical as a whole. Parallel mating planes 23 are formed on both sides of the main body portion 21. A mating hole 24 is provided through the two mating planes 23 on the main body portion 21 of the sling head 2. The mating hole 24 is in rotational cooperation with the rotating shaft 32, and the axis of the mating hole 24 is the rotation center of the sling head 2. After the sling head 2 and the connecting member 3 are assembled together, the two mating planes 23 are respectively in contact with the inner side surfaces of the two connecting arms. On the one hand, it can ensure the axial relative fixation between the sling head 2 and the connecting member 3, and on the other hand, it can also make the sling head 2 have a smaller size in the axial direction, and this axial direction is the axial direction of the mating hole 24. In other embodiments, the mating planes 23 may not be provided on the sling head 2. The protruding portion 22 is fixedly connected to the main body portion 21, and the protruding portion 22 is flat. The protruding portion 22 can be used as a handle for rotating the sling head 2, which is convenient for the operator to operate.

[0043] The outer surface of the main body portion 21 of the sling head 2 is a spherical surface, which enables the sling head 2 to roll on the upper surface of the prefabricated member 4. This spherical surface can be regarded as a rotating surface, and its rotating axis 32 line is parallel to the axis of the mating hole 24. An arc-shaped chute 25 is provided on this spherical surface. The chute 25 extends along the circumferential direction of the spherical surface rotation. The distances from the chute 25 to the two mating planes 23 are equal, and the center of curvature of the chute 25 is parallel to the axis of the mating hole 24. The width of the notch portion 251 of the chute 25 is smaller than the width of the bottom portion 252 of the chute 25. The chute 25 is specifically a T-shaped groove. An inlet 26 for the head 61 of the lifting nail to enter the bottom portion 252 of the chute 25 is provided at one end of the sling head 2 in the length direction of the chute 25. The inlet 26 is circular and its diameter dimension is equal to the width dimension of the bottom portion 252 of the chute 25, which is convenient for the head 61 of the lifting nail to enter the chute 25.

[0044] The mating hole 24 on the sling head 2 is offset from its center of gravity and centroid, so that when the sling is freely suspended, the sling head 2 can maintain the same posture.

[0045] During use, the sling head 2 has a suspended state and a connected state.

[0046] The suspended state means that the flexible sling is in a vertical state under the pulling of the lifting equipment. At this time, both connecting arms of the connecting piece 3 are vertically downward. In this state, the center of gravity of the sling head 2 is located below its rotation center, and the end of the chute 25 where the inlet 26 on the sling head 2 is located is higher than the other end of the chute 25.

[0047] Before using this sling to lift the precast member 4, it is necessary to keep the sling head 2 in the suspended state. Then, the operator uses a remote control to operate the lifting equipment to move the sling, so that the bottom of the sling head 2 touches the upper surface of the precast member 4 and is near the spherical pit 5. Then, the equipment lowers the lifting sling while moving the lifting sling, so that the upper end of the flexible sling moves in the direction of the pit 5. See the appendix Figure 4 , at this time the flexible sling is in an inclined state. The flexible sling has pulled the connecting piece 3, causing the connecting piece 3 to move horizontally. The horizontal movement of the connecting piece 3 will exert a horizontal force on the upper part of the sling head 2. At the same time, there is friction between the bottom of the sling head 2 and the upper surface of the precast member 4. Therefore, the sling head 2 will roll. Figure 4 This is the state where the sling head 2 makes a preliminary roll.

[0048] After the sling head 2 makes a preliminary roll, the rotating shaft 32 has rolled to the side of the contact point between the sling head 2 and the precast member 4 close to the pit 5, and the sling head 2 is at the edge of the pit 5.

[0049] After that, see the appendix Figure 5 , the lifting equipment continues to move the lifting sling while increasing the amount of the lifting sling released. After increasing the amount of the lifting sling released, the gravity of the connecting piece 3 and the flexible sling will be applied downward to the rotating shaft 32. Since the rotating shaft 32 has shifted to the side of the contact point between the sling head 2 and the precast member 4 close to the pit 5, a moment that causes it to rotate will be generated on the sling head 2. And the bottom of the sling head 2 is still subject to the friction of the precast member 4. Therefore, under the action of this moment, the sling head 2 rolls into the pit 5.

[0050] After the sling head 2 rolls into the pit 5, it will continue to roll along the inner wall of the pit 5 under its own gravity. When the sling head 2 rolls to the lowest point of the pit 5, the inlet 26 on the sling head 2 just buckles onto the lifting nail 6, and the head 61 of the lifting nail 6 enters the bottom 252 of the chute 25 through the inlet 26. At this time, the sling head 2 is in the connected state, the center of gravity of the sling head 2 rotates to one side of its rotation center, and the inlet 26 faces downward.

[0051] After that, see the appendix Figure 6The lifting equipment retracts the lifting sling upwards while moving in the opposite direction, and finally the upper end of the flexible sling is located directly above the sling head 2, and the flexible sling is in a vertical state, and the sling head 2 rotates in situ in the pit 5 to a suspended state. In this process, the head of the hanging nail 61 will slide along the bottom 252 of the chute 25 to the other end of the chute 25, and the head of the hanging nail 61 will not be able to escape from the chute 25 at this end.

[0052] Finally, the lifting equipment retracts the lifting sling upwards. At this time, the lifting sling is already connected to the lifting nail 6, so the prefabricated component 4 can be directly lifted.

[0053] By using the hoisting device to hoist the prefabricated component 4, the operator does not need to manually connect the hoisting device to the hanging nail 6 during the hoisting stage, so the operator does not need to work under the lifting equipment, which greatly improves the safety of the hoisting stage of the prefabricated component 4.

[0054] In this embodiment, the flexible rigging is a chain 1, which is specifically a ring chain in this embodiment. In other embodiments, the flexible rigging can also be a transmission chain, specifically, a single link of the transmission chain includes two chain plates and a chain shaft arranged between the two chain plates, the chain shaft is located at one end of the chain plate, and the other end of the chain plate is provided with a matching hole for rotationally cooperating with the chain shaft of the adjacent link, and the transmission chain can be bent in a fixed plane, so that the rolling stability of the sling head can be improved. The chain 1 has a strong load-bearing capacity, and in the process of switching the sling head 2 from the suspended state to the connected state, it is not necessary to apply a large pulling force to the chain 1. The chain 1 can use its own large gravity to rotate the connector 3 to ensure the accuracy of the operation. In other embodiments, the flexible rigging can also be a lifting belt. Since the wire rope has a certain rigidity, it is impossible to complete the conversion of the sling head 2 from the suspended state to the connected state, so the wire rope cannot be used as a flexible rigging.

[0055] The lifting rigging on the lifting equipment is the rigging that comes with the lifting equipment. There is no restriction on the material of the lifting rigging, and a chain 1 or a wire rope can be used. Regardless of the material of the lifting rigging, the flexible rigging needs to be connected to the lower end of the lifting rigging.

[0056] When the sling head 2 is in a suspended state, the protrusion 22 is located above the main body 21, and the protrusion 22 is located between the two connecting arms. When the sling head 2 is in a connected state, the protrusion 22 is on the horizontal side of the main body 21. Such a configuration of the protrusion 22 can adjust the center of gravity of the sling head 2, so that the center of the sling head 2 is between its centroid and the rotation center, which helps the sling head 2 to roll. The length of the sling head 2 satisfies that when the sling head 2 is in a connected state, the projection of the end of the protrusion 22 away from the main body 21 on the upper surface of the preform 4 is located outside the corresponding pit 5, so that when the sling head 2 rotates excessively, the protrusion 22 will abut against the upper surface of the preform 4 to prevent the sling head 2 from continuing to rotate.

[0057] Specific Embodiment 2 of the lifting device provided by the present utility model:

[0058] This embodiment is based on Embodiment 1. The difference from Embodiment 1 is that in this embodiment, the main body part of the lifting device head is a cylindrical structure, the outer peripheral surface of the main body part is a straight cylindrical surface, the outer peripheral surface of the main body part constitutes a rotating surface, and the rotation axis of the rotating surface coincides with the axis of the main body part.

[0059] In this embodiment, the chute is located in the axial middle of the main body part and extends along the circumferential direction of the main body part. The chute is arc-shaped, and the center of curvature of the chute is located on the axis of the main body part. The two axial end faces of the main body part respectively constitute two mating planes, and the distances from the chute to the two mating planes are equal.

[0060] In this embodiment, the outer peripheral surface of the main body part enables the main body part to roll on the upper surface of the prefabricated part, and the rolling stability is better, which can reduce the risk of tipping in the direction of the rolling axis during the rolling process.

[0061] In order to adapt to this lifting device, a semi-cylindrical pit needs to be formed on the prefabricated part.

[0062] Specific Embodiment 3 of the lifting device provided by the present utility model:

[0063] This embodiment is based on Embodiment 1. The difference from Embodiment 1 is that in this embodiment, the chute is a dovetail groove. In order to adapt to the shape of the chute, the head of the lifting nail used in this embodiment needs to have a conical surface that mates with the dovetail groove.

[0064] Specific Embodiment 4 of the lifting device provided by the present utility model:

[0065] This embodiment is based on Embodiment 1. The difference from Embodiment 1 is that in this embodiment, the connecting piece no longer has a rotating shaft. The connecting piece includes a connecting frame. Arcuate grooves are formed at the ends of the two connecting arms of the connecting frame, and arcuate mounting seats are fixedly arranged through bolts. The mounting seats and the grooves together enclose a mounting hole. Rotating columns with coincident axes are fixedly arranged on both sides of the lifting device head in this embodiment, and the rotating columns are rotationally matched with the corresponding mounting holes.

[0066] Specific Embodiment 5 of the lifting device provided by the present utility model:

[0067] This embodiment is based on Embodiment 1. The difference from Embodiment 1 is that in this embodiment, the length of the protruding part is shorter, and the projection of the end of the protruding part far from the main body part on the upper surface of the prefabricated part is located inside the corresponding pit, which can make the overall structure of the lifting device more compact and reduce the overall size of the lifting device.

[0068] Specific Embodiment 6 of the lifting device provided by the present utility model:

[0069] This embodiment is based on Embodiment 1. The difference from Embodiment 1 is that in this embodiment, no protrusion is provided on the sling head. To facilitate the operator to rotate the sling head during the process of detaching the sling from the prefabricated component after hoisting, a jack for inserting a lever tool can be provided on the sling head.

[0070] Specific embodiments of the lifting equipment provided by the present utility model:

[0071] The lifting equipment includes a bottom track and a gantry frame capable of guiding and moving along the bottom track. A top track is provided on the gantry frame, and a hoisting trolley capable of guiding and moving along the top track is provided on the top track. A hoisting sling hanging below the hoisting trolley is provided on the hoisting trolley. The lower end of the hoisting sling is connected to a sling, and the sling is the above-mentioned sling, which will not be elaborated here.

[0072] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still make modifications to the technical solutions described in the foregoing embodiments without creative efforts, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A hanger, comprising a connecting piece and a hanger head rotatably matched with the connecting piece, the hanger head having a rotating curved surface for rolling with the surface of a prefabricated piece, a slide groove extending along the rotating circumferential direction of the rotating curved surface, the width of the notch of the slide groove is smaller than the width of the bottom of the groove of the slide groove, and characterized in that: The sling also includes a flexible rigging, one end of which is connected to the connecting piece, and the other end is a mounting end for mounting on the lifting rigging of the lifting equipment. When in use, the sling head can roll under the driving action of the flexible rigging to produce a suspended state before rolling and a connected state after rolling. The rolling axis of the sling head is parallel to the rotation axis of the sling head relative to the connecting piece. An entry port connected to the slide slot is provided at one end of the sling head in the extension direction of the slide slot. The entry port is used to capture the head of the hanging nail at the center of the pit of the prefabricated part during the process of switching the sling head from the suspension state to the connection state. In the suspension state, the end of the slide slot where the entry port is located is higher than the other end of the slide slot, and in the connection state, the entry port faces downward.

2. The sling according to claim 1, characterized in that: The flexible rigging is a ring chain.

3. The sling according to claim 1, characterized in that: The flexible rigging is a transmission chain, and a single chain link of the transmission chain includes two chain plates and a chain shaft arranged between the two chain plates. The chain shaft is located at one end of the chain plate, and the other end of the chain plate is provided with a matching hole for rotationally matching with the chain shaft of the adjacent chain link.

4. The sling according to claim 1, characterized in that: The flexible rigging is a lifting belt.

5. The sling according to any one of claims 1 to 4, characterized in that: The rotation curved surface is a spherical surface.

6. The sling according to any one of claims 1 to 4, characterized in that: The rotation curved surface is a right cylindrical surface.

7. The sling according to any one of claims 1 to 4, characterized in that: The sling head comprises a main body and a flat protrusion protruding from the main body. When the sling head is in a suspended state, the protrusion is located above the main body. When the sling head is in a connected state, the protrusion is located on a horizontal side of the main body.

8. The sling according to any one of claims 1 to 4, characterized in that: The connecting piece includes a connecting frame and a rotating shaft fixed to the connecting frame. One end of the connecting frame is connected to the flexible rigging, and the other end of the connecting frame is a fork-shaped structure with two connecting arms, and the rotating shaft is located between the two connecting arms. A matching hole for rotating with the rotating shaft is provided on the sling head, and the axis of the matching hole is the rotation center of the sling head.

9. The sling according to claim 8, characterized in that: Matching planes for fitting with the inner side surfaces of the connecting arms are arranged on both sides of the spreader head, and two end portions of the matching hole respectively penetrate the two matching planes.

10. A lifting device, comprising a lifting rigging and a sling connected to the lower end of the lifting rigging, characterized in that: The sling is the sling according to any one of claims 1 to 9.

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