Special lifting appliance for lifting boom of large crawler crane

Abstract

The invention relates to a special lifting appliance for lifting a boom of a large crawler crane, which belongs to the technical field of crane lifting appliances and comprises a lifting seat, a lifting lug is fixedly arranged at the top of the lifting seat, the lifting lug is matched with a lifting hook of a lifting device in a hanging manner and used for lifting a truss boom, and two steel ropes are symmetrically arranged on two sides of the lifting seat. An adjusting assembly used for adjusting the distance between the two steel ropes is arranged in the lifting seat so as to adapt to lifting of truss arms with different widths. The bottom of the chord member is supported, buckled and hung through the arc-shaped supporting blocks, buckling and releasing operation can be rapidly completed, stable buckling and hoisting can be achieved without adopting additional fixing pieces for fixing, single-point stress on the chord member can be avoided, meanwhile, the hoisting process is high in stability and working efficiency, and in addition, the hoisting efficiency is improved. And through the modular design, the whole lifting appliance can be used more flexibly, so that the practicability of the whole lifting appliance is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of crane lifting tools and relates to a special lifting tool for the boom of a large crawler crane. Background Art

[0002] The boom structures of large crawler cranes are diverse, and the common one is a truss structure with variable length. According to the boom structure form, it can be divided into a truss boom crawler crane and a crawler tower crane. In addition to the main boom, the truss boom crawler crane can also be provided with a jib, and both the main boom and the jib can be lengthened or shortened as needed; the crawler tower crane uses the variable amplitude truss boom as the tower body and the jib as the lifting boom.

[0003] During the lengthening process of the truss boom crawler crane, each section of the truss boom needs to be lifted and butted by a lifting device. In the traditional lifting process, the method of bundling with ropes is mostly used. The cost of bundling with ropes is relatively low, but the stability is not strong, and the operation is relatively troublesome. Not only does it require tying knots, but it is also time-consuming to untie. In addition, there is also a method of directly using a hook to hook the chord member for lifting. Although the operation is simple and both disassembly and assembly are convenient, the situation of unhooking is likely to occur, and due to the single-point force of the hook, it is easy to cause the chord member of the truss boom to be bent and deformed, affecting the stress intensity of the truss boom during use and bringing potential safety hazards to the lifting work. Therefore, we propose a special lifting tool for the boom of a large crawler crane to solve the above-mentioned problems. Summary of the Invention

[0004] In view of this, in order to solve the problems that the traditional rope lifting operation is time-consuming and the stability is not strong, while the hook lifting is prone to unhooking, and at the same time it is easy to cause chord member deformation and affect the service life of the truss boom, the present invention provides a special lifting tool for the boom of a large crawler crane.

[0005] To achieve the above object, the present invention provides the following technical solutions: including a lifting seat, the top of the lifting seat is fixedly provided with a lifting lug, and the lifting lug is in hanging connection with the hook of the lifting device for lifting the truss boom;

[0006] Two steel ropes are symmetrically arranged on both sides of the lifting seat, and an adjusting component for adjusting the distance between the two steel ropes is arranged inside the lifting seat to adapt to the lifting of truss booms with different widths;

[0007] Four connection ends are respectively arranged at both ends of the two steel ropes;

[0008] Four hanging members are respectively detachably arranged at the bottoms of the four connection ends for hanging the truss boom, and through the detachable setting, different models of hanging members can be replaced to adapt to different models of truss booms.

[0009] Furthermore, the hanging member includes a hanging block, an arc-shaped groove is opened at the bottom of the hanging block, and the inner wall of the arc-shaped groove is symmetrically limited and slidably connected with two arc-shaped supporting blocks, and the arc-shaped concave surfaces on the two arc-shaped supporting blocks are combined to form a semicircular concave surface, and its inner diameter is adapted to the outer diameter of the chord of the truss arm.

[0010] Furthermore, an arc-shaped strip plate is fixedly connected to the top inner wall of the arc-shaped notch, and the arc-shaped strip plate is arranged between the two arc-shaped supporting blocks to form a complete semicircular concave surface.

[0011] Furthermore, the two arc-shaped support blocks are fixedly connected to an arc-shaped rod on one side close to each other, the two arc-shaped rods are staggered and slide through the arc-shaped strips, and one end of the two arc-shaped rods respectively penetrates the bottom of the other arc-shaped support block and is fixedly connected to a limiting head, and the interiors of the two arc-shaped support blocks are provided with arc-shaped through holes used in conjunction with the corresponding limiting heads.

[0012] Furthermore, two fixing rods are symmetrically fixedly connected to one side of the two arc-shaped support blocks away from the arc-shaped concave surface, and one end of the two fixing rods away from the arc-shaped support blocks is fixedly connected to the same toggle block, and the toggle block is located outside the hanging block.

[0013] Furthermore, two symmetrically disposed inner walls on both sides of the arc-shaped notch are provided with two clearance notches for movably penetrating and cooperating with corresponding fixing rods.

[0014] Furthermore, the bottoms of the inner walls on both sides of the arc-shaped slot are fixedly connected to limit blocks, and the two arc-shaped supporting blocks are provided with limit slots for use with corresponding limit blocks on the sides away from each other.

[0015] Furthermore, the connecting end comprises a connecting block, the bottom of the connecting block is fixedly connected with a threaded connecting rod, and the top of the hanging block is provided with a connecting screw hole threadedly connected with the threaded connecting rod.

[0016] Furthermore, a circular cavity is opened inside the connecting block, and a circular block is rotatably fitted inside the circular cavity. A steel rope connector is integrally provided on the top of the circular block, and the top of the steel rope connector passes through the top of the connecting block upward and is fixedly connected to one end of the steel rope.

[0017] Furthermore, the lifting seat includes a hanging plate, a lifting ear is arranged on the top of the hanging plate, a through groove is opened inside the hanging plate, two sliders are symmetrically slidably connected inside the through groove, the sides of the two sliders away from each other extend to the outside of the hanging plate, and the sides from which the two sliders extend are opened with rope holes for threading two steel ropes for lifting, and the distance between the two sliders can be adjusted by adjusting the assembly.

[0018] Further, the adjusting assembly includes an adjusting screw rod rotatably connected inside the through groove. A nut block slidably connected to the bottom wall of the through groove is threadedly sleeved on the outer wall of the adjusting screw rod. Two connecting rods are symmetrically and rotatably connected to the top of the nut block. Support blocks are fixedly connected to one side of each of the two sliders close to each other, and the other ends of the two connecting rods are respectively rotatably connected to the tops of the two support blocks.

[0019] Further, one end of the adjusting screw rod rotatably penetrates through one side of the hanging plate and is fixedly connected to a hand wheel.

[0020] Further, two sliding grooves are symmetrically formed in the inner wall of the top of the arc-shaped notch, and the two sliding grooves are respectively located on both sides of the arc-shaped strip plate. Pressure blocks are slidably connected inside the two sliding grooves. The bottom of the pressure block extends downward and is provided with an arc-shaped pressing groove adapted to the chord rod.

[0021] Further, a pressing screw rod is rotatably connected to the top of the pressure block. The top end of the pressing screw rod threadedly penetrates through the top of the hanging block and is fixedly connected to a knob.

[0022] Further, a rubber anti-slip pad is provided on the arc-shaped surface of the arc-shaped pressing groove.

[0023] The beneficial effects of the present invention are as follows:

[0024] By using the arc-shaped supporting block to lift and hook the bottom of the chord rod, the present invention can not only quickly complete the buckling and releasing operations, achieve stable buckling and lifting without using additional fixing parts, but also avoid single-point stress on the chord rod. At the same time, the lifting process has strong stability and high working efficiency. In addition, through the detachable connection between the hanging member and the connection end, the hanging member can be selectively replaced according to different types of truss arms without replacing the entire lifting tool. Through modular design, it can be used more flexibly, thereby improving the practicability of the entire lifting tool.

[0025] Other advantages, objectives and features of the present invention will be described to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail preferably with reference to the accompanying drawings, where:

[0027] Figure 1 is a schematic diagram of the state of hoisting the truss of the present invention;

[0028] Figure 2 is a three-dimensional view of the overall structure of the present invention;

[0029] Figure 3 It is a three-dimensional diagram of the lifting seat structure of the present invention;

[0030] Figure 4 It is a three-dimensional cross-sectional view of the lifting seat structure of the present invention;

[0031] Figure 5 It is a three-dimensional diagram of the connection structure between the hanging member and the connection end of the present invention;

[0032] Figure 6 For the present invention Figure 5 A three-dimensional bottom view of the overall structure;

[0033] Figure 7 For the present invention Figure 5 The overall structure of the three-dimensional explosion diagram;

[0034] Figure 8 It is a three-dimensional exploded cross-sectional view of the connection end structure of the present invention;

[0035] Figure 9 It is a three-dimensional cross-sectional view of the hanging component structure of the present invention;

[0036] Figure 10 It is a three-dimensional diagram of the matching structure of two arc-shaped brackets of the present invention;

[0037] Figure 11 It is a schematic diagram of the hanging state of two arc-shaped support blocks on the truss main beam.

[0038] Reference numerals: 10, hanging member; 101, hanging block; 1011, arc-shaped notch; 1012, clearance notch; 1013, connecting screw hole; 1014, slide groove; 102, arc-shaped support block; 1021, limit notch; 1022, arc-shaped through hole; 103, fixing rod; 104, toggle block; 105, arc-shaped strip; 106, limit block; 107, arc-shaped rod; 108, limit head; 109, pressure block; 1091, arc-shaped pressure groove; 11 0. Clamping screw; 111. Knob; 20. Lifting seat; 201. Hanging plate; 2011. Through slot; 202. Slider; 2021. Rope threading hole; 203. Adjusting screw; 204. Nut block; 205. Handwheel; 206. Connecting rod; 207. Lifting ear; 208. Support block; 30. Connecting end; 301. Connecting block; 3011. Circular cavity; 302. Circular block; 303. Threaded connecting rod; 304. Steel rope connector; 40. Steel rope. DETAILED DESCRIPTION

[0039] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0040] Embodiment 1: As Figures 1-3 shown, a special lifting tool for the boom hoisting of a large crawler crane includes four hanging parts 10, a lifting seat 20, four connecting ends 30, and two steel ropes 40. A lifting lug 207 is fixedly provided at the top of the lifting seat 20. The lifting lug 207 is hooked and matched with the hook of the lifting device for lifting the truss boom. The two steel ropes 40 are symmetrically arranged on both sides of the lifting seat 20. An adjusting component for adjusting the distance between the two steel ropes 40 is provided inside the lifting seat 20 to adapt to the hoisting of truss booms with different widths. The four connecting ends 30 are respectively arranged at both ends of the two steel ropes 40. The four hanging parts 10 are respectively detachably arranged at the bottoms of the four connecting ends 30 for hanging the truss boom. And through the detachable setting, different models of hanging parts 10 can be replaced to adapt to different models of truss booms.

[0041] The present invention can be used in the field of special lifting tools for the boom hoisting of large crawler cranes, and can also be applicable to other fields of the present invention.

[0042] Embodiment 2: This embodiment is a further improvement of the previous embodiment: As Figures 1-10 shown, the hanging part 10 includes a hanging block 101. An arc-shaped notch 1011 is opened at the bottom of the hanging block 101. Two arc-shaped supporting blocks 102 are symmetrically and limit-slidingly connected to the inner wall of the arc-shaped notch 1011. And the arc-shaped concave surfaces on the two arc-shaped supporting blocks 102 are combined to form a semi-circular concave surface, the inner diameter of which is adapted to the outer diameter of the chord of the truss boom. First, according to the model of the truss boom to be hoisted, select a suitable hanging part 10, that is, select the semi-circular concave surface formed by the combination of the two arc-shaped supporting blocks 102 to be adapted to the size of the chord of the truss boom, so that the two arc-shaped supporting blocks 102 can just be buckled on the upper half of the chord to complete the preliminary buckling operation. As Figure 1 shown, select a suitable hanging point according to the structure of the truss itself.

[0043] In one aspect of this embodiment, an arc-shaped strip plate 105 is fixedly connected to the inner wall at the top of the arc-shaped notch 1011. The arc-shaped strip plate 105 is disposed in a fitting manner between the two arc-shaped supporting blocks 102 and forms a complete semi-circular concave surface. Arc-shaped rods 107 are fixedly connected to the mutually approaching sides of the two arc-shaped supporting blocks 102. The two arc-shaped rods 107 are arranged in a staggered manner and both slide through the arc-shaped strip plate 105. One ends of the two arc-shaped rods 107 respectively penetrate through the bottom of the other arc-shaped supporting block 102 and are fixedly connected with limit heads 108. Arc-shaped through holes 1022 which are used in cooperation with the corresponding limit heads 108 are formed in the interiors of the two arc-shaped supporting blocks 102. The mutually approaching sides of the two arc-shaped supporting blocks 102 are in contact with the arc-shaped strip plate 105 and form a complete semi-circular groove, and this semi-circular groove is adapted to the outer diameter of the chord rod. After the entire hanging block 101 is adaptively buckled on the chord rod through the two arc-shaped supporting blocks 102, then the two arc-shaped supporting blocks 102 are moved away from each other on the inner wall of the arc-shaped notch 1011, so that the two arc-shaped supporting blocks 102 can rotate and move along the outer wall of the chord rod. When the two arc-shaped supporting blocks 102 both rotate 90 degrees, at this time they are both located in the lower half of the chord rod, and at the same time one side of the two arc-shaped supporting blocks 102 is in contact, as Figure 11 shown, the lower half of the chord rod is lifted, so that the chord rod can be buckled in cooperation with the arc-shaped strip plate 105. In addition, during the process of the arc-shaped supporting blocks 102 moving away from each other, the corresponding arc-shaped rods 107 can be driven to move simultaneously, and the limit heads 108 can pass through the corresponding arc-shaped through holes 1022 and abut against one side of the arc-shaped strip plate 105, which can not only limit the movement of the arc-shaped supporting blocks 102, but also strengthen the stable buckling and lifting of the two arc-shaped supporting blocks 102 on the chord rod. When the two arc-shaped supporting blocks 102 are buckled on the lower half of the chord rod, one side of the two arc-shaped supporting blocks 102 is still located in the arc-shaped notch 1011. Through the limitation of the hanging block 101 on the arc-shaped supporting blocks 102, the lifting stability of the arc-shaped supporting blocks 102 on the chord rod can be strengthened.

[0044] In one aspect of the present embodiment, the two arc-shaped support blocks 102 are symmetrically fixedly connected to two fixing rods 103 on one side away from the arc-shaped concave surface, and the two fixing rods 103 are fixedly connected to the same toggle block 104 on one end away from the arc-shaped support block 102, and the toggle block 104 is located on the outside of the hanging block 101, and the inner walls on both sides of the arc-shaped notch 1011 are symmetrically provided with two clearance notches 1012 that are movably penetrated and matched with the corresponding fixing rods 103. The arc-shaped support block 102 can be operated on the outside of the hanging block 101 through the toggle block 104. Specifically, by operating the toggle block 104 to rotate downward, the arc-shaped support block 102 can be driven by the fixing rod 103 to slide downward on the inner wall of the arc-shaped notch 1011, so as to achieve a quick buckle on the chord rod, and no fixing parts are needed to fix the arc-shaped support block 102, so as to achieve an effective buckle and support effect. In the process of lifting the truss arm, the arc-shaped support block 102 is subjected to the downward pressure of the truss arm, so that it can be stably lifted. The operation and use are very simple and convenient. By setting the clearance notch 1012, the normal up and down movement of the fixing rod 103 can be ensured. Conversely, by operating the toggle block 104 to rotate upward, the arc-shaped support block 102 can be moved upward to release the buckle of the chord rod, so as to achieve a quick removal effect without the need to use the traditional operation method of untying ropes or removing bolts, which not only saves time and effort, but also effectively improves the lifting and installation efficiency.

[0045] In one aspect of this embodiment, the bottoms of the inner walls on both sides of the arc-shaped slot 1011 are fixedly connected to the limit blocks 106, and the two arc-shaped support blocks 102 are provided with limit slots 1021 for use with the corresponding limit blocks 106 on the sides away from each other. When the arc-shaped support blocks 102 slide downward, the limit blocks 106 can enter the limit slots 1021. Figure 11 As described above, after the two arc-shaped support blocks 102 collide with each other in the lower half of the chord rod, the limit block 106 can collide with the inner wall of the limit slot 1021 to form a limit interference fit, thereby achieving a limit sliding effect on the arc-shaped support block 102 and further improving the stable supporting effect of the arc-shaped support block 102.

[0046] Embodiment 3: This embodiment is a further improvement of the previous embodiment: Figures 5-9As shown in the figure, the connecting end 30 includes a connecting block 301. A threaded connecting rod 303 is fixedly connected to the bottom of the connecting block 301. A connecting screw hole 1013 that is threadedly connected to the threaded connecting rod 303 is provided at the top of the hanging block 101. Through the threaded connection between the threaded connecting rod 303 and the connecting screw hole 1013, the connecting block 301 and the hanging block 101 can be detachably and fixedly connected, which is convenient for quickly replacing different models of hanging members 10 to adapt to the lifting of different models of truss arms. A circular cavity 3011 is provided inside the connecting block 301. A circular block 302 is rotatably fitted inside the circular cavity 3011. A steel rope connecting head 304 is integrally provided at the top of the circular block 302, and the top end of the steel rope connecting head 304 penetrates upward through the top of the connecting block 301 and is fixedly connected to one end of the steel rope 40. Through the fixed connection between the steel rope 40 and the steel rope connecting head 304, the entire connecting end 30 can be suspended below the lifting seat 20 for easy use. When installing the hanging member 10, first align the connecting screw hole 1013 with the threaded connecting rod 303. At this time, the entire hanging member 10 can be rotated, or the connecting block 301 can be rotated, specifically according to personal usage habits, so that the threaded connecting rod 303 is threadedly connected into the connecting screw hole 1013, thereby completing the fixation between the hanging member 10 and the connecting end 30. Through this design, the hanging member 10 can also be hung on the chord, and the disassembly operation with the hanging member 10 can be completed by rotating the connecting block 301, making it more flexible to use. Then, through the cooperation of the lifting seat 20 and the steel rope 40, the truss arm can be lifted through the connection and cooperation between the connecting end 30 and the hanging member 10. The entire process of disassembly, installation, and replacement is very convenient, and the lifting process is highly stable. Compared with directly hanging with a hook or lifting with a rope, the strength is stronger.

[0047] Embodiment 4: This embodiment is a further improvement of the previous embodiment: As Figures 2-4As shown, the lifting seat 20 includes a lifting plate 201, a lifting lug 207 is provided at the top of the lifting plate 201, a through groove 2011 is formed inside the lifting plate 201, two sliders 202 are symmetrically and slidably connected inside the through groove 2011, and one side of each of the two sliders 202 away from each other extends to the outside of the lifting plate 201. A rope passing hole 2021 is formed on one side of each of the two sliders 202 extending out for the threading and lifting of two steel ropes 40, and the distance between the two sliders 202 can be adjusted through an adjusting assembly. The lifting seat 20 is hung on the hook of the lifting device through the lifting lug 207, and then the entire lifting seat 20 is lifted upward by a certain height by the lifting device. At this time, through the cooperation of the sliders 202 and the steel ropes 40, the connecting end 30 can be suspended and lifted. Then, according to different models of truss arms, a suitable hanging member 10 is selected, the hanging member 10 is first installed on the connecting end 30, and then the hanging member 10 is pulled to hook it on the upper chord. The hanging member 10 at the other end of the steel rope 40 can be operated by another person at the same time, and the steel rope 40 is stretched to make the steel rope 40 in a tensioned state. This process can be operated by adjusting the height of the lifting seat 20. Both of the two steel ropes 40 are tightened by the same operation to keep the lifting process of the entire truss arm stable during lifting and avoid tilting lifting. The distance between the two sliders 202 can be adjusted through the adjusting assembly, and then the distance between the two steel ropes 40 can be adjusted to make the distance between the two steel ropes 40 the same as the distance between the two upper chords, so as to ensure that the tension adjustment of the steel rope 40 is convenient during the adjustment and pulling process, and the steel rope 40 will not be in a twisted and tensioned state during lifting, which can better protect the steel rope 40 and improve the service life of the entire device. In addition, in order to facilitate the movement adjustment of the steel rope 40 inside the slider 202, the rope passing hole 2021 is set in an arc shape and polished to make its inner wall smooth, so as to facilitate the smooth movement adjustment of the steel rope 40 in the rope passing hole 2021 and avoid the wear of the steel rope 40 caused by friction.

[0048] In one aspect of this embodiment, the adjusting assembly includes an adjusting screw rod 203 rotatably connected inside the through groove 2011. A nut block 204 that is slidably connected to the bottom wall of the through groove 2011 is threadedly sleeved on the outer wall of the adjusting screw rod 203. Two connecting rods 206 are symmetrically and rotatably connected to the top of the nut block 204. A support block 208 is fixedly connected to each of the two sides of the two sliders 202 that are close to each other, and the other ends of the two connecting rods 206 are respectively rotatably connected to the tops of the two support blocks 208. Rotating the adjusting screw rod 203 drives the nut block 204 to move, and can drive the two sliders 202 to move relatively through the two connecting rods 206, thereby adjusting the distance between the two sliders 202, and thus achieving the effect of adjusting the distance between the two steel ropes 40. One end of the adjusting screw rod 203 rotatably penetrates through one side of the hanging plate 201 and is fixedly connected to a hand wheel 205. The hand wheel 205 facilitates the rotation operation of the adjusting screw rod 203.

[0049] Embodiment 5: This embodiment is a further improvement of the previous embodiment: As Figures 5-9 shown, two sliding grooves 1014 are symmetrically formed in the inner wall of the top of the arc-shaped notch 1011, and the two sliding grooves 1014 are respectively located on both sides of the arc-shaped strip plate 105. A pressing block 109 is slidably connected to the inside of each of the two sliding grooves 1014. The bottom of the pressing block 109 extends downward and is provided with an arc-shaped pressing groove 1091 adapted to the chord rod. A pressing screw rod 110 is rotatably connected to the top of the pressing block 109. The top end of the pressing screw rod 110 threadedly penetrates through the top of the hanging block 101 and is fixedly connected to a knob 111. After the hanging member 10 is buckled on the chord rod, the adjusting steel rope 40 is adjusted to be in a tensioned state. Then, the knob 111 is rotated to drive the pressing screw rod 110 to rotate and extend downward. At the same time, the pressing block 109 can be driven to move downward, and is pressed on the upper half of the chord rod through the arc-shaped pressing groove 1091, and cooperates with the two arc-shaped supporting blocks 102 to resist and lift the lower half of the chord rod, so that the entire hanging member 10 can be limited and buckled on the chord rod, thereby preventing the hanging member 10 from sliding during the lifting process, and also ensuring that the steel rope 40 is in a tensioned state, so that the entire truss arm can be lifted smoothly. The arc-shaped surface of the arc-shaped pressing groove 1091 is provided with a rubber anti-slip pad. Through the extrusion contact between the anti-slip rubber pad and the chord rod, the limiting stability of the hanging member 10 can be further improved.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A special lifting device for lifting the boom of a large crawler crane, characterized in that: include: A lifting seat (20), wherein a lifting lug (207) is fixedly provided on the top of the lifting seat (20), and the lifting lug (207) is engaged with a lifting hook of a lifting device and is used to lift the truss arm; Two steel ropes (40) are symmetrically arranged on both sides of the lifting seat (20); an adjustment component for adjusting the distance between the two steel ropes (40) is arranged inside the lifting seat (20) to adapt to the lifting of truss arms of different widths; Four connection ends (30) are respectively arranged at two ends of the two steel ropes (40); Four hanging parts (10) are detachably arranged at the bottom of the four connecting ends (30) and are used for hanging the truss arm. Through the detachable arrangement, hanging parts (10) of different models can be replaced to adapt to truss arms of different models.

2. A special lifting device for lifting the boom of a large crawler crane as claimed in claim 1, characterized in that: The hanging member (10) comprises a hanging block (101), the bottom of the hanging block (101) is provided with an arc-shaped notch (1011), the inner wall of the arc-shaped notch (1011) is symmetrically limited and slidably connected to two arc-shaped support blocks (102), and the arc-shaped concave surfaces on the two arc-shaped support blocks (102) are combined to form a semicircular concave surface, the inner diameter of which is adapted to the outer diameter of the chord of the truss arm.

3. A special lifting device for lifting the boom of a large crawler crane as claimed in claim 2, characterized in that: The top inner wall of the arc-shaped notch (1011) is fixedly connected with an arc-shaped strip plate (105), and the arc-shaped strip plate (105) is arranged between the two arc-shaped supporting blocks (102) to form a complete semicircular concave surface; The two arc-shaped support blocks (102) are fixedly connected to an arc-shaped rod (107) on one side close to each other. The two arc-shaped rods (107) are staggered and slide through the arc-shaped strip (105). One end of the two arc-shaped rods (107) respectively penetrates the bottom of the other arc-shaped support block (102) and is fixedly connected to the limit head (108). The inside of the two arc-shaped support blocks (102) is provided with an arc-shaped through hole (1022) used in conjunction with the corresponding limit head (108).

4. A special lifting device for lifting a large crawler crane boom as claimed in claim 3, characterized in that: Two fixed rods (103) are symmetrically fixedly connected to the two arc-shaped support blocks (102) at one side away from the arc-shaped concave surface, and the two fixed rods (103) are fixedly connected to the same toggle block (104) at one end away from the arc-shaped support blocks (102), and the toggle block (104) is located outside the hanging block (101); Two symmetrically disposed inner walls on both sides of the arc-shaped notch (1011) are provided with two clearance notches (1012) that are movably inserted into and cooperate with corresponding fixing rods (103).

5. A special lifting device for lifting a large crawler crane boom as claimed in claim 4, characterized in that: The bottoms of the inner walls on both sides of the arc-shaped notch (1011) are fixedly connected to the limiting blocks (106), and the two arc-shaped support blocks (102) are provided with limiting notches (1021) for use with the corresponding limiting blocks (106) on the sides away from each other. When the arc-shaped support blocks 102 slide downward, the limiting blocks 106 can enter the limiting notches 1021.

6. A special lifting device for lifting a large crawler crane boom as claimed in claim 5, characterized in that: The connecting end (30) comprises a connecting block (301), a threaded connecting rod (303) is fixedly connected to the bottom of the connecting block (301), and a connecting screw hole (1013) threadedly connected to the threaded connecting rod (303) is formed on the top of the hanging block (101); A circular cavity (3011) is provided inside the connection block (301), and a circular block (302) is rotatably fitted inside the circular cavity (3011). A steel rope connector (304) is integrally provided on the top of the circular block (302), and the top end of the steel rope connector (304) passes through the top of the connection block (301) upwards and is fixedly connected to one end of the steel rope (40).

7. A special lifting device for lifting a large crawler crane boom as claimed in claim 6, characterized in that: The lifting seat (20) comprises a hanging plate (201), a lifting ear (207) is arranged on the top of the hanging plate (201), a through slot (2011) is provided inside the hanging plate (201), two sliders (202) are symmetrically slidably connected inside the through slot (2011), the two sliders (202) extend away from each other on one side to the outside of the hanging plate (201), and the two sliders (202) extend on one side to form a rope threading hole (2021) for threading two steel ropes (40) for lifting, and the distance between the two sliders (202) can be adjusted by adjusting the component.

8. A special lifting device for lifting a large crawler crane boom as claimed in claim 7, characterized in that: The adjustment assembly comprises an adjustment screw (203) rotatably connected inside the through slot (211); a nut block (204) slidably connected to the bottom wall of the through slot (211) is provided on the outer wall of the adjustment screw (203); the top of the nut block (204) is symmetrically rotatably connected to two connecting rods (206); the sides of the two sliders (202) close to each other are fixedly connected to support blocks (208); and the other ends of the two connecting rods (206) are rotatably connected to the tops of the two support blocks (208) respectively; One end of the adjusting screw rod (203) rotates through one side of the hanging plate (201) and is fixedly connected to a hand wheel (205).

9. A special lifting device for lifting a large crawler crane boom as claimed in claim 8, characterized in that: The top inner wall of the arc-shaped notch (1011) is symmetrically provided with two slide grooves (1014), and the two slide grooves (1014) are respectively located on both sides of the arc-shaped strip plate (105), and the insides of the two slide grooves (1014) are slidably connected with a pressing block (109), and the bottom of the pressing block (109) extends downward and is provided with an arc-shaped pressing groove (1091) adapted to the chord rod; The top of the pressing block (109) is rotatably connected to a pressing screw (110), and the top thread of the pressing screw (110) penetrates the top of the hanging block (101) and is fixedly connected to a knob (111).

10. A special lifting device for lifting a large crawler crane boom as claimed in claim 9, characterized in that: The arc-shaped surface of the arc-shaped pressing groove (1091) is provided with a rubber anti-slip pad.

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