Special lifting appliance for lifting boom of large crawler crane

Abstract

The invention relates to the technical field of hoisting of engineering machinery, and discloses a special hoisting tool for hoisting a boom of a large crawler crane, the special hoisting tool comprises a main body, a placing groove is formed in the main body, and a plurality of strip-shaped grooves are formed in the bottom of the placing groove. In the rotating process of the telescopic rod, the pushing assembly on the side wall can be pulled to extend, so that when the rotating shaft rotates under the action force applied by the device to the connecting rod and the connecting block, the rotation of the rotating shaft is delayed through the arc-shaped block by the counter-acting force applied by the telescopic rod and the arc-shaped spring to the arc-shaped block; and the situation that the rotating shaft slightly rotates due to certain acting force generated in the process that the device is changed into a vertical state from an inclined state after being separated from the ground is reduced, so that the influence on the device during hoisting butt joint is reduced, and the hoisting accuracy of the hoisting tool is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering machinery hoisting, in particular to a special lifting appliance for hoisting a large crawler crane jib. BACKGROUND

[0002] The special lifting appliance for hoisting a large crawler crane jib is engineering equipment designed for the modular assembly requirements of super-long and super-heavy jibs. The traditional hoisting method uses steel wire ropes or general lifting appliances, which has problems such as high risk of jib deformation, low positioning accuracy, uneven load distribution of multiple lifting points, etc. Especially in large-tonnage (such as kiloton-level) working conditions, it is easy to cause local stress concentration of the structure, therefore, it is urgent to develop a special lifting appliance with multi-point pressure balance, anti-twist and buffer protection to improve the safety and efficiency of hoisting large jibs.

[0003] In the use of the device, several positioning blocks are generally connected to adapt to the diameter of the hoisted device, then the two ends of the positioning block are connected to the device to be hoisted through the connecting rope, and the crane jib is connected to the interface at the top of the lifting appliance. When the cylindrical device is gradually hoisted by the lifting appliance, the device will be subjected to the tension force of the crane after being lifted off the ground, and will generate a certain force during the transition from tilting to vertical state, which can easily cause the lifting appliance to rotate slightly under the action of the force, thereby affecting the accuracy of the hoisted device during docking and the hoisting efficiency of subsequent hoisting. SUMMARY

[0004] The present application aims to provide a special lifting appliance for hoisting a large crawler crane jib to solve the problems raised in the background.

[0005] To solve the above technical problems, the present application is realized by the following technical scheme:

[0006] The present application is a special lifting appliance for hoisting a large crawler crane jib, comprising a main body, a placing groove is formed in the inside of the main body, a plurality of strip grooves are formed in the bottom of the placing groove, and further comprising:

[0007] A moving mechanism is installed and arranged in the inside of the placing groove, which is used for swinging when the main body is running;

[0008] An auxiliary mechanism is installed and arranged in the inside of the main body, which is used for contraction when the main body is running.

[0009] Further, the main body comprises:

[0010] A fixing assembly is installed and arranged in the inside of the placing groove, which is used for connecting with the equipment to be hoisted;

[0011] The rotating assembly is arranged at the bottom of the placing groove through the mounting of the extrusion piece, and is used for swinging when the fixed assembly moves.

[0012] The extrusion piece comprises a fixed ring fixedly connected at the bottom of the placing groove, and two arc springs fixedly connected to the inner wall of the fixed ring.

[0013] Further, the moving mechanism comprises:

[0014] The swinging assembly is arranged at the inner wall of the fixed ring through the mounting of the connecting piece, and is used for moving when the rotating assembly moves.

[0015] The connecting piece comprises two fixed blocks fixedly connected to the inner wall of the fixed ring, and the fixed blocks are provided with sliding grooves in the interiors.

[0016] The pushing assembly is slidingly arranged in the interior of the rotating assembly, and is used for moving synchronously when the swinging assembly moves.

[0017] Further, the auxiliary mechanism comprises:

[0018] The telescopic assembly is arranged at the side wall of the rotating assembly, and is used for pushing when the rotating assembly moves.

[0019] Further, the fixed assembly comprises a fixed table fixedly connected at the top of the placing groove, a rotating shaft rotatably connected to the bottom of the fixed table, a connecting block fixedly connected to the bottom of the rotating shaft, and two connecting rods rotatably connected to the outer surface of the connecting block.

[0020] The two connecting rods are symmetrically distributed on the connecting block, and a limiting rod is fixedly connected between the two connecting rods.

[0021] Further, the rotating assembly comprises a telescopic rod fixedly connected to the end of the arc spring away from the fixed ring, an arc-shaped block rotatably connected to the bottom of the output shaft of the telescopic rod, and an arc-shaped strip fixedly connected to the bottom of the arc-shaped block.

[0022] The interior of the arc-shaped block is provided with an arc-shaped groove, the bottom of the arc-shaped groove is provided with two movement grooves, and the end of the telescopic rod close to the fixed ring is rotatably connected to the inner wall of the fixed ring.

[0023] Further, the swinging assembly comprises a spring one fixedly connected to the inner wall of the sliding groove, a sliding block fixedly connected to the end of the spring one away from the sliding groove, and two swinging rods one rotatably connected to the bottom of the sliding block.

[0024] The outer surface of the sliding block is slidingly connected to the inner wall of the sliding groove, and the top of the sliding block is slidingly connected to the bottom of the telescopic rod.

[0025] Further, the pushing assembly comprises a rotating block rotatably connected to the sliding block away from the spring, and a swing rod II rotatably connected to the top of the rotating block, and a pushing plate rotatably connected to the end of the swing rod II away from the rotating block.

[0026] Wherein the outer surface of the rotating block is slidably connected to the inner wall of the fixed ring, and the bottom of the pushing plate is fixedly connected with a moving block, and the moving block is slidably connected to the inside of the strip-shaped groove.

[0027] Further, the telescopic assembly comprises a pushing block fixedly connected to the side wall of the telescopic rod, and the side wall of the pushing block is provided with an elastic plate.

[0028] Wherein the bottom of the elastic plate is fixedly connected with two moving blocks, and the outer surface of the moving block is slidably connected to the inside of the moving groove.

[0029] Further, the inner wall of the elastic plate is fixedly connected with a spring II, and the end of the spring II away from the elastic plate is fixedly connected with a pressing plate.

[0030] Wherein the side wall of the pressing plate is slidably connected to the inside of the arc-shaped groove.

[0031] The present application has the following advantages:

[0032] 1、The present application, when the arc-shaped block rotates, the telescopic rod will rotate on the side wall of the fixed ring and pull the telescopic rod to extend, and in the process of rotating the telescopic rod, the pushing assembly of the side wall will be pulled to extend, so that when the rotating shaft is rotated by the force applied by the device to the connecting rod and the connecting block, the counterforce applied by the telescopic rod and the arc-shaped spring to the arc-shaped block will delay the rotation of the rotating shaft through the arc-shaped block, reduce the force generated in the process of changing from an inclined state to a vertical state after the device leaves the ground, so as to reduce the influence of the device on the docking of the hoist, and improve the accuracy of the hoist during hoisting.

[0033] 2、The present application, when the sliding block moves, the swing rod I will be pushed to slide on the inner wall of the fixed ring through the rotating block, and in the process of sliding the rotating block, the pushing plate will be pushed to move towards the direction of the rotating shaft through the swing rod II, and in the process of moving the pushing plate, the pushing plate will contact the arc-shaped strip, so as to limit the arc-shaped strip when the arc-shaped block drives the arc-shaped strip to rotate, reduce the situation that the rotating shaft and the surface of the arc-shaped block are separated due to the change of the angle of the arc-shaped block when the rotating shaft drives the connecting rod to rotate, so as to ensure the stability of the arc-shaped block when it rotates with the rotating shaft, and improve the stability of the device during hoisting.

[0034] 3、The arc-shaped block rotates, the pushing block installed on the side wall of the telescopic rod will be affected by the change of the angle between the arc-shaped block and the telescopic rod, so that the distance between the arc-shaped block and the rotating shaft is reduced, so that the pushing block moves to the inside of the arc-shaped groove, in the process of moving the pushing block, the elastic plate connected with it will be pushed to slide to both sides in the inside of the movement groove through the movement block, so that the elastic plate is stretched, in the process of stretching the elastic plate, a pushing force is applied to spring two, when spring two is contracted by the pushing force, a part of the pushing force is dispersed, so that the extrusion plate slides to the rotating shaft in the inside of the arc-shaped groove, so that the inner wall of the extrusion plate is attached to the outer surface of the rotating shaft, thereby increasing the friction between the arc-shaped block and the connecting block, further improving the accuracy of the lifting appliance during lifting.

[0035] 4、In the process of moving the pushing plate to the rotating shaft direction, the moving block located at the bottom of the pushing plate moves to the rotating shaft direction in the inside of the strip-shaped groove, so that the pushing plate is limited by the action of the moving block during movement, and the inner wall of the pushing plate is attached to the outer surface of the arc-shaped strip, so as to assist the arc-shaped strip to attach the outer surface of the rotating shaft, so that the arc-shaped block can better apply a counter force to the rotating shaft during rotation, thereby reducing the counter force brought by the rotating shaft when being acted on, further improving the stability of the device during lifting.

[0036] Of course, implementing any product of the present application does not necessarily require all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0038] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0039] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present application;

[0040] Figure 3 It is a schematic diagram of the fixed assembly of the present application;

[0041] Figure 4 It is a partial cross-sectional view of the main body of the present application;

[0042] Figure 5 It is a schematic diagram of the partial cross-sectional structure of the rotating assembly of the present application;

[0043] Figure 6Figure 1 is a schematic view of a rotating assembly of the present application;

[0044] Figure 7 Figure 2 is a schematic view of a swinging assembly of the present application;

[0045] Figure 8 Figure 3 is a partial sectional view of the swinging assembly of the present application;

[0046] Figure 9 Figure 4 is a schematic view of a pushing assembly of the present application;

[0047] Figure 10 Figure 5 is a schematic view of a telescopic assembly of the present application.

[0048] In the drawings, the components represented by the respective reference numerals are listed as follows:

[0049] In the drawings, the components represented by the respective reference numerals are listed as follows: 1, main body; 101, placing groove; 102, strip-shaped groove; 11, fixing assembly; 111, fixing table; 112, rotating shaft; 113, connecting block; 114, connecting rod; 12, rotating assembly; 121, fixing ring; 122, arc-shaped spring; 123, telescopic rod; 124, arc-shaped block; 125, arc-shaped strip; 2, moving mechanism; 21, swinging assembly; 211, fixing block; 212, sliding groove; 213, spring one; 214, sliding block; 215, swinging rod one; 22, pushing assembly; 221, rotating block; 222, swinging rod two; 223, pushing plate; 3, auxiliary mechanism; 31, telescopic assembly; 311, pushing block; 312, elastic plate; 313, spring two; 314, extrusion plate. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0051] The terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device including a series of steps or units is not limited to the listed steps or units, but can optionally further include steps or units not listed, or can optionally further include other steps or units inherent to the process, method, product, or device.

[0052] Reference to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all referring to a common set of embodiments. It is expressly understood that the described embodiments are merely examples from a

[0053] Referring to Figures 1-10 As shown in the drawings, the present application is a large crawler crane jib hoist special lifting device, including the main body 1, the inside of the main body 1 is provided with a placing groove 101, the bottom of the placing groove 101 is provided with a plurality of strip grooves 102, further comprising:

[0054] The moving mechanism 2 is installed and arranged in the inside of the placing groove 101, and is used for swinging when the main body 1 runs;

[0055] The auxiliary mechanism 3 is installed and arranged in the inside of the main body 1, and is used for shrinking when the main body 1 runs.

[0056] The main body 1 comprises:

[0057] The fixed assembly 11 is installed and arranged in the inside of the placing groove 101, and is used for connecting with the equipment to be hoisted;

[0058] The rotating assembly 12 is installed and arranged at the bottom of the placing groove 101 through the extrusion piece, and is used for swinging when the fixed assembly 11 moves.

[0059] The extrusion piece comprises a fixed ring 121 fixedly connected at the bottom of the placing groove 101, and the inner wall of the fixed ring 121 is fixedly connected with two arc springs 122.

[0060] The moving mechanism 2 comprises:

[0061] The swinging assembly 21 is installed and arranged at the inner wall of the fixed ring 121 through the connecting piece, and is used for moving when the rotating assembly 12 moves;

[0062] The connecting piece comprises two fixed blocks 211 fixedly connected at the inner wall of the fixed ring 121, and the inside of the fixed block 211 is provided with a sliding groove 212;

[0063] The pushing assembly 22 is slidably arranged in the inside of the rotating assembly 12, and is used for moving synchronously when the swinging assembly 21 moves.

[0064] The auxiliary mechanism 3 comprises:

[0065] The telescopic assembly 31 is arranged on the side wall of the rotating assembly 12 and is used to push when the rotating assembly 12 moves.

[0066] The fixed assembly 11 comprises a fixed table 111 fixedly connected to the top of the placing groove 101, the bottom of the fixed table 111 is rotatably connected with a rotating shaft 112, the bottom of the rotating shaft 112 is fixedly connected with a connecting block 113, and the outer surface of the connecting block 113 is rotatably connected with two connecting rods 114.

[0067] The two connecting rods 114 are symmetrically distributed on the connecting block 113, and a limiting rod is fixedly connected between the two connecting rods 114.

[0068] The rotating assembly 12 comprises a telescopic rod 123 fixedly connected to the arc-shaped spring 122 away from the fixed ring 121, the bottom of the output shaft of the telescopic rod 123 is rotatably connected with an arc-shaped block 124, and the bottom of the arc-shaped block 124 is fixedly connected with an arc-shaped strip 125.

[0069] The inside of the arc-shaped block 124 is provided with an arc-shaped groove, the bottom of the arc-shaped groove is provided with two movement grooves, one end of the telescopic rod 123 close to the fixed ring 121 is rotatably connected with the inner wall of the fixed ring 121, and the arc-shaped block 124 in contact with the outer surface of the rotating shaft 112 is driven to rotate by friction in the process of rotating the rotating shaft 112.

[0070] The swinging assembly 21 comprises a spring one 213 fixedly connected to the inner wall of the sliding groove 212, the end of the spring one 213 away from the sliding groove 212 is fixedly connected with a sliding block 214, and the bottom of the sliding block 214 is rotatably connected with two swinging rods one 215.

[0071] The outer surface of the sliding block 214 is slidably connected with the inner wall of the sliding groove 212, and the top of the sliding block 214 is slidably connected with the bottom of the telescopic rod 123.

[0072] The pushing assembly 22 comprises a rotating block 221 rotatably connected to the sliding block 214 away from one end of the spring 213, and the top of the rotating block 221 is rotatably connected with a swing rod 222, and the end of the swing rod 222 away from the rotating block 221 is rotatably connected with a pushing plate 223;

[0073] Wherein, the outer surfaces of the rotating blocks 221 are slidably connected with the inner wall of the fixed ring 121, the bottom of the pushing plate 223 is fixedly connected with a moving block, and the moving block is slidably connected in the inner part of the strip-shaped groove 102; when the sliding block 214 moves, the swing rod 215 is pushed to slide on the inner wall of the fixed ring 121 through the rotating block 221; in the process of sliding of the rotating block 221, the pushing plate 223 is pushed to move towards the direction of the rotating shaft 112 through the swing rod 222.

[0074] The telescopic assembly 31 comprises a pushing block 311 fixedly connected to the side wall of the telescopic rod 123, and the side wall of the pushing block 311 is provided with an elastic plate 312;

[0075] Wherein, the bottom of the elastic plate 312 is fixedly connected with two moving blocks, and the outer surfaces of the moving blocks are slidably connected in the inner part of the moving groove; when the arc-shaped block 124 rotates, the pushing block 311 fixedly connected to the side wall of the telescopic rod 123 will be affected by the change of the angle between the arc-shaped block 124 and the telescopic rod 123, so that the distance between the arc-shaped block 124 and the rotating shaft 112 decreases, so that the pushing block 311 moves to the inner part of the arc-shaped groove.

[0076] The inner wall of the elastic plate 312 is fixedly connected with a spring 313, and the end of the spring 313 away from the elastic plate 312 is fixedly connected with a pressing plate 314;

[0077] Wherein, the side wall of the pressing plate 314 is slidably connected in the inner part of the arc-shaped groove; in the process of moving of the pushing block 311, the elastic plate 312 connected with the pushing block 311 is pushed to slide to both sides in the inner part of the moving groove through the moving blocks, so that the elastic plate 312 is stretched; in the process of stretching of the elastic plate 312.

[0078] In use, first, the top of the main body 1 is connected with the crane boom, and the bottom of the connecting rod 114 is sleeved on the connecting rope, and then the other end of the connecting rope is connected with the device to be lifted, and the crane is started, and when the crane drives the main body 1 and the device connected with the connecting rod 114 upward through the boom, a certain force is generated during the process of the device changing from a tilted state to a vertical state after leaving the ground, which causes the device to drive the connecting rod 114 and the connecting block 113 to swing, and in the process of the connecting block 113 swinging, the rotating shaft 112 connected therewith is driven to rotate, and in the process of the rotating shaft 112 rotating, the arc-shaped block 124 in contact with the outer surface thereof is driven to rotate by the friction force, and in the process of the arc-shaped block 124 rotating, the telescopic rod 123 is rotated on the side wall of the fixed ring 121 while being pulled to extend, and in the process of the telescopic rod 123 rotating, the pushing assembly 22 of the side wall is pulled to extend, so that when the rotating shaft 112 is rotated by the force applied by the device to the connecting rod 114 and the connecting block 113, the counterforce applied by the telescopic rod 123 and the arc-shaped spring 122 to the arc-shaped block 124 delays the rotation of the rotating shaft 112 through the arc-shaped block 124, reduces the case that the rotating shaft 112 slightly rotates in the process of the device changing from a tilted state to a vertical state after leaving the ground, and thus reduces the influence of the device on the lifting and connection, and improves the accuracy of the lifting device during lifting.

[0079] In the process of the telescopic rod 123 rotating, the sliding block 214 at the bottom thereof moves in the sliding groove 212 to the direction of the fixed ring 121, and in the process of the sliding block 214 moving, the spring 213 is pushed to contract, and in the process of the sliding block 214 moving, the swinging rod 215 is pushed to slide on the inner wall of the fixed ring 121 through the rotating block 221, and in the process of the rotating block 221 sliding, the pushing plate 223 is pushed to move to the direction of the rotating shaft 112 through the swinging rod 222, and in the process of the pushing plate 223 moving, the arc-shaped strip 125 is contacted, so as to limit the arc-shaped strip 125 when the arc-shaped block 124 drives the arc-shaped strip 125 to rotate, and thus the stability of the arc-shaped block 124 rotating with the rotating shaft 112 is ensured, and the stability of the device during lifting is improved.

[0080] In the process that the arc-shaped block 124 follows the rotating shaft 112 to rotate, since the angle between the arc-shaped block 124 and the telescopic rod 123 changes in the process of rotating, when the arc-shaped block 124 rotates, the pushing block 311 installed on the side wall of the telescopic rod 123 will be affected by the angle change between the arc-shaped block 124 and the telescopic rod 123, so that the distance between the arc-shaped block 124 and the rotating shaft 112 decreases, thus the pushing block 311 moves to the inside of the arc-shaped groove, in the process that the pushing block 311 moves, the elastic plate 312 connected with the pushing block 311 will slide to both sides in the inside of the movement groove through the movement block, so that the elastic plate 312 is stretched, in the process that the elastic plate 312 is stretched, a pushing force is applied to the spring 313, when the spring 313 is contracted under the pushing force, a part of the pushing force is dispersed, so that the extrusion plate 314 slides to the direction of the rotating shaft 112 in the inside of the arc-shaped groove, so that the inner wall of the extrusion plate 314 is attached to the outer surface of the rotating shaft 112, thus the friction between the arc-shaped block 124 and the connecting block 113 is increased, and the accuracy of the lifting appliance when hoisting is further improved.

[0081] In the process that the pushing plate 223 moves to the direction of the rotating shaft 112, the movement block at the bottom of the pushing plate 223 moves to the direction of the rotating shaft 112 in the inside of the strip-shaped groove, so that the pushing plate 223 is limited by the movement block when moving, thus the inner wall of the pushing plate 223 is attached to the outer surface of the arc-shaped strip 125, so as to assist the arc-shaped strip 125 to attach the arc-shaped block 124 to the outer surface of the rotating shaft 112, thus the arc-shaped block 124 can better apply a counterforce to the rotating shaft 112 when rotating, so as to slow down the counterforce of the rotating shaft 112 when being affected, and the stability of the device when lifting is further improved.

[0082] The preferred embodiments disclosed above are only used to help explain the present application. The preferred embodiments do not describe all the details, and the application is not limited to the specific embodiments described. Obviously, according to the content of the specification, many modifications and changes can be made. The specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the application, so that those skilled in the art can well understand and utilize the application. The application is limited by the claims and their entire scope and equivalents.

Claims

1. A large crawler crane boom hoisting special lifting device, including the main body (1), the inside of the main body (1) is provided with a placing groove (101), the bottom of the placing groove (101) is provided with a plurality of strip grooves (102), characterized in that, Also includes; The moving mechanism (2) is installed and arranged in the inside of the placing groove (101), and is used for swinging when the main body (1) operates; The auxiliary mechanism (3) is installed and arranged in the inside of the main body (1), and is used for shrinking when the main body (1) operates.

2. The special spreader for a large crawler crane boom according to claim 1, characterized in that, The main body (1) comprises: The fixed assembly (11) is installed and arranged in the inside of the placing groove (101), and is used for connecting with the device to be lifted; The rotating assembly (12) is installed and arranged at the bottom of the placing groove (101) through the extrusion piece, and is used for swinging when the fixed assembly (11) moves. The extrusion piece comprises a fixed ring (121) fixedly connected at the bottom of the placing groove (101), and the inner wall of the fixed ring (121) is fixedly connected with two arc springs (122).

3. The special spreader for a large crawler crane boom according to claim 2, characterized in that, The moving mechanism (2) comprises: The swinging assembly (21) is installed and arranged at the inner wall of the fixed ring (121) through the connecting piece, and is used for moving when the rotating assembly (12) moves; The connecting piece comprises two fixed blocks (211) fixedly connected at the inner wall of the fixed ring (121), and the inside of the fixed block (211) is provided with a sliding groove (212); The pushing assembly (22) is slidably arranged in the inside of the rotating assembly (12), and is used for moving synchronously when the swinging assembly (21) moves.

4. The special spreader for a large crawler crane boom according to claim 3, characterized in that, The auxiliary mechanism (3) comprises: The telescopic assembly (31) is installed and arranged at the side wall of the rotating assembly (12), and is used for pushing when the rotating assembly (12) moves.

5. The special spreader for a large crawler crane boom according to claim 4, characterized in that: The fixed assembly (11) comprises a fixed table (111) fixedly connected at the top of the placing groove (101), a rotating shaft (112) rotatably connected at the bottom of the fixed table (111), a connecting block (113) fixedly connected at the bottom of the rotating shaft (112), and two connecting rods (114) rotatably connected at the outer surface of the connecting block (113); Wherein, the two connecting rods (114) are symmetrically distributed on the connecting block (113), and a limiting rod is fixedly connected between the two connecting rods (114).

6. The special spreader for a large crawler crane boom according to claim 5, characterized in that: The rotating assembly (12) comprises a telescopic rod (123) fixedly connected at the end of the arc spring (122) away from the fixed ring (121), an arc-shaped block (124) rotatably connected at the output shaft bottom of the telescopic rod (123), and an arc-shaped strip (125) fixedly connected at the bottom of the arc-shaped block (124); Wherein, the inside of the arc-shaped block (124) is provided with an arc-shaped groove, the bottom of the arc-shaped groove is provided with two movement grooves, and the end of the telescopic rod (123) close to the fixed ring (121) is rotatably connected with the inner wall of the fixed ring (121).

7. The special spreader for a large crawler crane boom according to claim 6, characterized in that: The swing assembly (21) includes a spring one (213) fixedly connected to the inner wall of the sliding groove (212), one end of the spring one (213) away from the sliding groove (212) is fixedly connected with a sliding block (214), and the bottom of the sliding block (214) is rotatably connected with two swing rods one (215). Wherein, the outer surface of the sliding block (214) is in sliding connection with the inner wall of the sliding groove (212), and the top of the sliding block (214) is in sliding connection with the bottom of the telescopic rod (123).

8. The special spreader for a large crawler crane boom according to claim 7, characterized in that: The push assembly (22) includes a rotating block (221) rotatably connected to one end of the sliding block (214) away from the spring one (213), the top of the rotating block (221) is rotatably connected with a swing rod two (222), and one end of the swing rod two (222) away from the rotating block (221) is rotatably connected with a push plate (223). Wherein, the outer surface of the rotating block (221) is in sliding connection with the inner wall of the fixed ring (121), the bottom of the push plate (223) is fixedly connected with a moving block, and the moving block is in sliding connection with the inside of the strip-shaped groove (102).

9. The special spreader for a large crawler crane boom according to claim 8, characterized in that: The telescopic assembly (31) includes a push block (311) fixedly connected to the side wall of the telescopic rod (123), and the side wall of the push block (311) is provided with an elastic plate (312). Wherein, the bottom of the elastic plate (312) is fixedly connected with two moving blocks, and the outer surface of the moving block is in sliding connection with the inside of the moving groove.

10. The special spreader for a large crawler crane boom according to claim 9, characterized in that: The inner wall of the elastic plate (312) is fixedly connected with a spring two (313), and one end of the spring two (313) away from the elastic plate (312) is fixedly connected with a pressing plate (314). Wherein, the side wall of the pressing plate (314) is in sliding connection with the inside of the arc-shaped groove.

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