A cutter head lifting lug device

Abstract

The present invention discloses a cutter head lifting lug device, comprising: a movable lifting lug, the movable lifting lug is provided with a hook groove for clamping the large ring of the cutter head, the movable lifting lug is further provided with an oblong hole, and the oblong hole is located below the hook groove; a lifting lug fixing bolt, one end of the lifting lug fixing bolt is used for passing through the oblong hole and fixing to the fixed sleeve of the cutter head; a fixed auxiliary turning-over lifting lug, the fixed auxiliary turning-over lifting lug is used for being fixed adjacent to the side cutter box plate of the cutter head; during the lifting process, the top of the movable lifting lug is fixed to the shackle, the hook groove is clamped to the large ring of the cutter head, the lifting lug fixing bolt is fixedly connected through the oblong hole and the fixed sleeve, and the cutter head is lifted by lifting the movable lifting lug and the fixed auxiliary turning-over lifting lug.

Description

Technical Field

[0001] The present invention relates to the technical field of shield tunneling, and particularly relates to a cutter head lifting lug device. Background Art

[0002] The cutter head is located at the very front end of the shield machine and is an important component of the shield machine. In the processes of manufacturing, shop assembly and commissioning, on-site assembly of the shield cutter head, as well as disassembly after the completion of the engineering project, cutter head maintenance and reuse, etc., hoisting or turning over operations need to be carried out on the cutter head. Looking at the whole process, the cutter head needs to be hoisted several times. How to safely, quickly, conveniently, reliably and economically realize the hoisting of the cutter head is a problem worthy of consideration.

[0003] The hoisting of the shield cutter head initially adopted the form of welded lifting lugs. In this way, the structure of the lifting lugs is simple and reliable, and during the manufacturing process in the workshop, the operability is strong. However, before the assembly is completed on the construction site and tunneling begins, the lifting lugs need to be removed, the positions of the lifting lugs need to be ground, and then wear-resistant plates or surfacing wear-resistant welding need to be welded at the corresponding positions. This operation process belongs to the category of high-altitude operations, with great difficulty and high risk. In addition, after the completion of the engineering project, when the cutter head is disassembled, maintained and reused, etc., the wear-resistant plates or surfacing wear-resistant materials at the lifting points need to be removed, and then the lifting lugs need to be welded. This is time-consuming, laborious and material-consuming, and the repeated welding, grinding, cutting and planing, etc. also cause great damage to the structural strength of the cutter head itself. Therefore, this form of hoisting has gradually been replaced, and detachable hoisting has begun to be designed and used in practice. Summary of the Invention

[0004] The purpose of the present invention is to provide a cutter head lifting lug device, in which the movable lifting lug is detachable, simple to install, convenient to disassemble, and can be recycled.

[0005] To achieve the above purpose, the present invention provides a cutter head lifting lug device, including:

[0006] A movable lifting lug, the movable lifting lug is provided with a hook groove for clamping the large ring of the cutter head, and the movable lifting lug is also provided with an oblong hole, and the oblong hole is located below the hook groove;

[0007] A lifting lug fixing bolt, one end of the lifting lug fixing bolt is used to pass through the oblong hole and is fixed to the fixed sleeve of the cutter head;

[0008] A fixed auxiliary turning-over lifting lug, the fixed auxiliary turning-over lifting lug is used to be fixed adjacent to the side cutter box plate of the cutter head;

[0009] During the hoisting process, the top of the movable lifting lug is fixed to the shackle, the hook groove is clamped to the large ring of the cutter head, the lifting lug fixing bolt is fixedly connected through the oblong hole and the fixed sleeve, and by hoisting the movable lifting lug and the fixed auxiliary turning-over lifting lug, the cutter head can be hoisted.

[0010] Optionally, the movable lifting lug is hook-shaped. The hook groove includes a horizontally connected horizontal section and a vertical section. The horizontal section is used to fit against the inner wall of the large ring, and the vertical section is used to fit against the end face of the large ring. There is a clearance space between the vertical section and the front shield of the cutter head.

[0011] Optionally, the movable lifting lug is also provided with a through hole, which is located above the hook groove and is used for detachable connection with a shackle.

[0012] Optionally, the first end of the lifting lug fixing bolt is provided with an external thread. The first end is used to pass through the kidney-shaped hole and be fastened to the fixing sleeve of the cutter head. The size of the second end of the lifting lug fixing bolt is larger than that of the first end, and the second end is used to abut against the end face of the movable lifting lug.

[0013] Optionally, a fastening hole is also provided on the outer periphery of the second end. By inserting a tool into the fastening hole and rotating the tool, the connection between the lifting lug fixing bolt and the movable lifting lug can be made reliable.

[0014] Optionally, a lifting lug baffle is also provided between the second end and the end face of the movable lifting lug to increase the friction force between the second end and the end face of the movable lifting lug.

[0015] Optionally, a sealing member is further included, which is used to block the connection hole of the fixing sleeve when not in lifting.

[0016] Optionally, a blocking cover plate is also provided on the outer side of the sealing member. The blocking cover plate is detachably connected to the fixing sleeve through blocking fasteners.

[0017] Optionally, the movable lifting lug includes a movable lifting lug plate and a lifting lug reinforcing plate. The movable lifting lug plate is provided with a kidney-shaped hole, and two lifting lug reinforcing plates are respectively arranged on the two end faces of the movable lifting lug plate.

[0018] Optionally, the movable lifting lug is also provided with a small lifting lug, and the small lifting lug and the hook groove are respectively located on both sides of the movable lifting lug.

[0019] Compared with the above background technology, the cutter head lifting lug device provided by the present invention includes: a movable lifting lug, a lifting lug fixing bolt, and a fixed auxiliary turning-over lifting lug. The movable lifting lug is provided with a hook groove for clamping the large ring of the cutter head. The movable lifting lug is also provided with a kidney-shaped hole, which is located below the hook groove. One end of the lifting lug fixing bolt is used to pass through the kidney-shaped hole and be fixed to the fixing sleeve of the cutter head. The fixed auxiliary turning-over lifting lug is used to be fixed adjacent to the side cutter box plate of the cutter head. During the lifting process, the top of the movable lifting lug is fixed to a shackle, the hook groove is clamped to the large ring of the cutter head, and the lifting lug fixing bolt is fixedly connected to the fixing sleeve through the kidney-shaped hole. By lifting the movable lifting lug and the fixed auxiliary turning-over lifting lug, the cutter head can be lifted.

[0020] The cutter head lifting lug device arranged in this way enables the movable lifting lug to be disassembled relative to the cutter head. It is simple to install and convenient to disassemble. The movable lifting lug can be recycled. The movable lifting lug is connected to the fixed sleeve of the cutter head through the lifting lug fixing bolt. The placement position of the movable lifting lug has little limitation and is less affected by the cutter head structure, with a wide adaptation range. During hoisting, only the inner surface of the large ring is the bearing surface. The structure of the cutter head lifting lug device is reliable and stable. By engaging the large ring through the hook groove of the movable lifting lug, the position of the hoisted cutter head can be effectively fixed, reducing the risk of the cutter head falling off. At the same time, the lifting lug fixing bolt does not bear the gravity of the cutter head and plays a role in connecting and limiting, effectively preventing structural failure. The fixed auxiliary turning-over lifting lug is arranged in the circumferential direction of the side cutter box plate. The fixed auxiliary turning-over lifting lug does not need to be disassembled after hoisting and can limit the particle size during tunneling. The detachable movable lifting lug and the two fixed auxiliary turning-over lifting lugs cooperate with each other, making the hoisting and turning of the cutter head faster and safer. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0022] Figure 1 Schematic diagram of the cutter head lifting lug device provided by the embodiment of the present invention installed on the cutter head;

[0023] Figure 2 For Figure 1 Schematic diagram in the A direction in

[0024] Figure 3 For Figure 1 Schematic diagram in the B direction in

[0025] Figure 4 For Figure 2 Schematic diagram in the C-C direction during hoisting in

[0026] Figure 5 For Figure 2 Schematic diagram in the C-C direction during tunneling in

[0027] Figure 6 Schematic diagram of the movable lifting lug of the cutter head lifting lug device provided by the embodiment of the present invention;

[0028] Wherein:

[0029] Cutter head 1, large ring 1-1, first side cutter box plate 1-2, reinforcing plate 1-3, second side cutter box plate 1-4, third side cutter box plate 1-5, fixed sleeve 1-6, sealing plate 1-7

[0030] Movable lifting lug 2, movable lifting lug plate 2-1, lifting lug reinforcement plate 2-2, small lifting lug 2-3, through hole 2-1-1, kidney-shaped hole 2-1-2, horizontal section 2-1-3, vertical section 2-1-4,

[0031] Lifting lug fixing bolt 3,

[0032] Lifting lug baffle 4,

[0033] Fixed auxiliary turning-over lifting lug 5,

[0034] Sealing cover plate 6,

[0035] Sealing member 7,

[0036] Sealing fastener 8,

[0037] Front shield 9. Specific implementation mode

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] In order to enable those skilled in the art in the technical field to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0040] The cutter head lifting lug device provided in the embodiment of the present application is referred to the attached drawings of the specification Figure 1 to the attached Figure 6 , and includes: a movable lifting lug 2, a lifting lug fixing bolt 3, and a fixed auxiliary turning-over lifting lug 5. The cutter head lifting lug device is used for lifting the cutter head 1.

[0041] The movable lifting lug 2 is provided with a hook groove for clamping the large ring 1-1 of the cutter head 1. The hook groove can effectively fix the position of the lifted cutter head 1 and reduce the risk of the cutter head 1 falling off. The movable lifting lug 2 is also provided with a kidney-shaped hole 2-1-2, and the kidney-shaped hole 2-1-2 is located below the hook groove; one end of the lifting lug fixing bolt 3 passes through the kidney-shaped hole 2-1-2 and is fixed to the fixed sleeve 1-6 of the cutter head 1.

[0042] The large ring 1-1 serves as the main structure of the cutter head 1, on which components such as the fixed sleeve 1-6, the sealing plate 1-7, and the side cutter box plates are welded. The side cutter box plates include the first side cutter box plate 1-2, the second side cutter box plate 1-4, and the third side cutter box plate 1-5. The first side cutter box plate 1-2 and the fixed sleeve 1-6 are located at the upper part of the cutter head 1, and the second side cutter box plate 1-4 and the third side cutter box plate 1-5 are located at the lower part of the cutter head 1. A through hole is provided on the first side cutter box plate 1-2 for welding and fixing with the fixed sleeve 1-6; a reinforcing plate 1-3 can be welded on the outer side of the first side cutter box plate 1-2 to effectively enhance the structural strength; the fixed sleeve 1-6 is welded and fixed with the first side cutter box plate 1-2 and the reinforcing plate 1-3 on the outer side. It can be seen that the length of the fixed sleeve 1-6 should be determined according to the center line of the movable lifting lug 2 passing through the center position of the cutter head 1 when the movable lifting lug 2 is in the vertical position, so as to fully ensure the stability and reliability of the hoisting and effectively reduce the force on the movable lifting lug 2; a wear-resistant welding layer can also be welded on the cylindrical surface of the exposed outer circumference of the fixed sleeve 1-6, which can effectively prevent wear during tunneling.

[0043] Two fixed auxiliary turning lifting lugs 5 can be provided. One fixed auxiliary turning lifting lug 5 is arranged close to the second side cutter box plate 1-4, and the other fixed auxiliary turning lifting lug 5 is arranged close to the third side cutter box plate 1-5. The second side cutter box plate 1-4 and the third side cutter box plate 1-5 can be symmetrically arranged at the lower part of the cutter head 1, that is, two fixed auxiliary turning lifting lugs 5 are welded at appropriate positions close to the second side cutter box plate 1-4 and the third side cutter box plate 1-5 for the orientation conversion and turning of the cutter head 1.

[0044] The fixed auxiliary turning lifting lugs 5 are welded along the circumferential direction of the cutter head 1 and do not need to be removed after the hoisting of the cutter head 1. When the cutter head 1 is tunneling, the fixed auxiliary turning lifting lugs 5 can play a role in restricting the particle size and prevent the phenomenon that large particle size pebbles or large rocks enter the back soil bin of the cutter head 1 but cannot be output by the screw conveyor.

[0045] During the hoisting process, the top of the movable lifting lug 2 is fixed to the shackle, the hook groove of the movable lifting lug 2 is stuck in the large ring 1-1 of the cutter head 1, and the lug fixing bolt 3 is fixedly connected with the fixed sleeve 1-6 through the kidney-shaped hole 2-1-2. The cutter head 1 is hoisted by hoisting the movable lifting lug 2 and the fixed auxiliary turning lifting lug 5.

[0046] It can be seen that a hook groove is provided on the movable lifting lug 2, and the large ring 1-1 is stuck into the hook groove. When the cutter head 1 is hoisted, only the inner surface of the large ring 1-1 is the bearing surface, making the hoisting process reliable and stable. At the same time, a kidney-shaped hole 2-1-2 for passing through the lug fixing bolt 3 is provided in the lower half of the movable lifting lug 2. The movable lifting lug 2 and the lug fixing bolt 3 are in clearance fit. When the cutter head 1 is hoisted, the lug fixing bolt 3 is not stressed. The lug fixing bolt 3 is only used to connect the movable lifting lug 2 and the cutter head 1 and plays a role in restricting the horizontal sliding of the movable lifting lug 2.

[0047] The movable lifting lug 2 can be set in a hook shape. The hook groove includes a horizontally connected horizontal section 2-1-3 and a vertical section 2-1-4. The horizontal section 2-1-3 is used to fit against the inner wall of the large ring 1-1, and the vertical section 2-1-4 is used to fit against the end face of the large ring 1-1. There is a clearance space between the vertical section 2-1-4 and the front shield 9 of the cutter head 1. That is, the length of the horizontal section 2-1-3 is guaranteed to match the height of the large ring 1-1, and the height of the vertical section 2-1-4 is ensured not to interfere with the inner surface of the front shield 9.

[0048] The movable lifting lug 2 is also provided with a through hole 2-1-1, which is located above the hook groove and is used for detachably connecting with a shackle.

[0049] The steps for lifting the cutter head 1 (from the horizontal to the vertical process) can be generally summarized as follows:

[0050] First: From inside the large ring 1-1 of the cutter head 1, install the movable lifting lug 2 along the top surface of the large ring 1-1 towards the bottom surface, and snap the large ring 1-1 into the hook groove of the movable lifting lug 2;

[0051] Then: The lug fixing bolt 3 passes through the kidney-shaped hole 2-1-2 opened in the lower half of the movable lifting lug plate 2-1 to connect the movable lifting lug 2 with the fixed sleeve 1-6 of the cutter head 1. A lug baffle 4 can be installed between the lug fixing bolt 3 and the movable lifting lug 2 to increase the friction force between the second end and the end face of the movable lifting lug 2 and increase the contact force-bearing surface;

[0052] Next: The sling shackle pin passes through the through hole 2-1-1 opened in the upper half of the movable lifting lug 2 to connect the movable lifting lug 2 with the sling shackle, and is ready for lifting by the steel wire rope;

[0053] After that: Two shackles for another sling are respectively connected with two fixed auxiliary turning-over lifting lugs 5 on the cutter head 1 through shackle pins, and are ready for lifting by the steel wire rope;

[0054] Finally: The sling simultaneously lifts the movable lifting lug 2 and the fixed auxiliary turning-over lifting lug 5 from the same side, lifts the cutter head 1 to a suitable height above the ground (that is, the position where the cutter head 1 is placed vertically without touching the ground), and then slowly lowers the fixed auxiliary turning-over lifting lug 5 until the cutter head 1 is in a vertical lifting state, that is, the lifting of the cutter head 1 (from the horizontal to the vertical process) is completed.

[0055] The first end of the lifting ear fixing bolt 3 is provided with an external thread, and the first end is used to penetrate the waist-shaped hole 2-1-2 and then be fastened to the fixed sleeve 1-6 of the cutter disc 1. The size of the second end of the lifting ear fixing bolt 3 is larger than that of the first end, and the second end is used to tighten the end face of the movable lifting ear 2, that is, a countersunk hole is opened on one side of the fixed sleeve 1-6 and is sealed by a sealing plate 1-7, and a threaded hole is opened on the other side of the fixed sleeve 1-6 for threaded connection with the lifting ear fixing bolt 3.

[0056] A fastening hole is also provided on the outer periphery of the second end of the lifting ear fixing bolt 3. By inserting a tool into the fastening hole and rotating the tool, the lifting ear fixing bolt 3 and the movable lifting ear 2 can be reliably fixed. That is to say, an external thread is provided on one side of the lifting ear fixing bolt 3, and four fastening holes can be provided in the radial direction of the bolt head on the other side of the lifting ear fixing bolt 3. The tool is inserted into the fastening hole and rotated to tighten the lifting ear fixing bolt 3. Of course, the tightening method of the lifting ear fixing bolt 3 is not limited to setting four fastening holes, and other methods can also be used to tighten the lifting ear fixing bolt 3.

[0057] The cutter head lifting lug device also includes a seal 7, which is used to seal the connection hole of the fixed sleeve 1-6 when not lifting. A blocking cover plate 6 is also provided on the outside of the seal 7, and the blocking cover plate 6 is detachably connected to the fixed sleeve 1-6 through a blocking fastener 8. That is, after the cutter head 1 is assembled and lifted, the lifting lug baffle 4 and the movable lifting lug 2 are removed, and the blocking cover plate 6, the seal 7 and the blocking fastener 8 are installed, thereby completing the protection of the internal threaded hole (connection hole) of the fixed sleeve 1-6.

[0058] The movable lifting ear 2 includes a movable lifting ear plate 2-1 and a lifting ear reinforcement plate 2-2. The waist-shaped hole 2-1-2 is arranged on the movable lifting ear plate 2-1. The two lifting ear reinforcement plates 2-2 are respectively arranged on the two end surfaces of the movable lifting ear plate 2-1. The two end surfaces of the movable lifting ear plate 2-1 can be welded with the lifting ear reinforcement plates 2-2 to enhance the structural strength of the movable lifting ear 2.

[0059] The movable lifting ear 2 is also provided with a small lifting ear 2-3, and the small lifting ear 2-3 and the hook groove are respectively located on both sides of the movable lifting ear 2. It can be seen that the movable lifting ear 2 includes a movable lifting ear plate 2-1, a lifting ear reinforcement plate 2-2 and a small lifting ear 2-3. The upper part of the movable lifting ear plate 2-1 is provided with a through hole 2-1-1 for passing through the shackle pin shaft. The position of the through hole 2-1-1 is determined by the structure of the lifting shackle to ensure that the shackle can be around the through hole> 90°. The lower part of the movable lifting ear plate 2-1 is provided with a waist-shaped hole 2-1-2 for passing through the lifting ear fixing bolt 3. The small lifting ear 2-3 provided on the movable lifting ear 2 is helpful for transporting and installing the movable lifting ear 2.

[0060] The steps for vertical lifting of the cutter head 1 are as follows:

[0061] The lifting tool for connecting and fixing the auxiliary turning-over lifting lug 5 fails to work. The cutter head 1 is vertically lifted and transported to the target position by the lifting tool pulling the movable lifting lug 2.

[0062] The lifting process of the cutter head 1 from vertical to horizontal is opposite to the above process of the cutter head 1 from horizontal to vertical, which will not be elaborated here.

[0063] The steps for turning over the cutter head 1 are as follows:

[0064] When the cutter head 1 is in a vertical state, remove the lifting tool located on the fixed auxiliary turning-over lifting lug 5, reconnect it from the opposite side of the cutter head 1, then slowly lift the fixed auxiliary turning-over lifting lug 5 and lower the movable lifting lug 2 until the cutter head 1 is in a horizontal state, thus completing the turning over of the cutter head 1.

[0065] After the lifting and transportation of the cutter head 1 are completed, remove the lug fixing bolts 3, the movable lifting lug 2 and the lug baffle 4, and install the plugging cover plate 6, the seal 7 and the plugging fastener 8.

[0066] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0067] The cutter head lifting lug device provided by the present invention has been introduced in detail above. Specific examples are used herein to elaborate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A cutter head lifting lug device, characterized in that, Comprising: A movable lifting lug, the movable lifting lug is provided with a hook groove for clamping the large ring of the cutter head. The movable lifting lug is further provided with an oblong hole which is located below the hook groove; A lifting lug fixing bolt, one end of the lifting lug fixing bolt is used for passing through the oblong hole and being fixed to the fixing sleeve of the cutter head; A fixed auxiliary turning-over lifting lug, provided with a lifting hole, and the fixed auxiliary turning-over lifting lug is used for being fixed adjacent to the side cutter box plate of the cutter head; The movable lifting lug is arranged in a hook shape. The hook groove comprises a horizontally connected horizontal section and a vertical section. The horizontal section is used for fitting with the inner wall of the large ring, and the vertical section is used for fitting with the end face of the large ring. There is an avoidance space between the vertical section and the front shield of the cutter head; The movable lifting lug and the lifting lug fixing bolt are in clearance fit. During the hoisting of the cutter head, the lifting lug fixing bolt is not stressed. The lifting lug fixing bolt is only used for connecting the movable lifting lug and the cutter head to limit the horizontal sliding of the movable lifting lug; During the lifting process, the top of the movable lifting lug is fixed to the shackle, the hook groove is clamped to the large ring of the cutter head, and the lifting lug fixing bolt is fixedly connected to the fixing sleeve through the oblong hole. By hoisting the movable lifting lug and the fixed auxiliary turning-over lifting lug, the cutter head is hoisted; after the cutter head is hoisted, the fixed auxiliary turning-over lifting lug does not need to be removed. When the cutter head is tunneling, the fixed auxiliary turning-over lifting lug plays a role in restricting the particle size to prevent large particle size pebbles or large rocks from entering the rear soil bin of the cutter head but unable to be output by the screw conveyor.

2. The cutter head lifting lug device according to claim 1, characterized in that, The movable lifting lug is further provided with a through hole which is located above the hook groove, and the through hole is used for detachably connecting with the shackle.

3. The cutter head lifting lug device according to claim 1, characterized in that The first end of the lifting lug fixing bolt is provided with an external thread. The first end is used for passing through the oblong hole and being fastened to the fixing sleeve of the cutter head. The size of the second end of the lifting lug fixing bolt is larger than that of the first end, and the second end is used for abutting against the end face of the movable lifting lug.

4. The cutter head lifting lug device according to claim 3, wherein The outer periphery of the second end is further provided with a fastening hole. By inserting a tool into the fastening hole and rotating the tool, the fixing of the lifting lug fixing bolt and the movable lifting lug can be made reliable.

5. The cutter head lifting lug device according to claim 3, characterized in that, A lifting lug baffle is further arranged between the second end and the end face of the movable lifting lug to increase the friction force between the second end and the end face of the movable lifting lug through the lifting lug baffle.

6. The cutter head lifting lug device according to any one of claims 1-5, characterized in that It further comprises a sealing member, and the sealing member is used for plugging the connection hole of the fixing sleeve when not hoisting.

7. The cutter head lifting lug device according to claim 6, characterized in that, A plugging cover plate is arranged on the outer side of the sealing member, and the plugging cover plate is detachably connected to the fixing sleeve through plugging fasteners.

8. The cutter head lifting lug device according to any one of claims 1-5, characterized in that The movable lifting lug comprises a movable lifting lug plate and a lifting lug reinforcing plate. The movable lifting lug plate is provided with the oblong hole, and two lifting lug reinforcing plates are respectively arranged on two end faces of the movable lifting lug plate.

9. The cutter head lifting lug device according to claim 8, characterized in that The movable lifting lug is further provided with a small lifting lug, and the small lifting lug and the hook groove are respectively located on two sides of the movable lifting lug.

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