Device and method for preventing central lifting rod of wheel stacking excircle lifting appliance from falling off

Abstract

The invention discloses a central lifting rod anti-falling device of a wheel stacking excircle lifting appliance. The central lifting rod anti-falling device comprises a lifting ring, an anti-unhooking door frame, a lifting rod seat, a retractable lifting hook, a central lifting rod and a lifting hook, the upper ends of the lifting ring and the retractable lifting hook are movably arranged at the upper and lower ends of the suspender seat respectively; the suspender seat is vertically provided with a through hole and sleeves the outer side of the central suspender; the upper end of the central suspender is provided with an external thread, and the lower part of the rod body is sequentially sleeved with a conical sleeve, a slip ring and a transverse framework, and the lower end is provided with a cylinder through a bottom nut; the lower end of the retractable hook is movably connected with the bottom of the conical sleeve; the top of the mousing-hook door frame is fixedly welded to the top end of the center hanging rod, and the two sides of the mousing-hook door frame are fixedly welded to the fixing nuts respectively. The transverse framework is in a trifurcate shape, three outer ends of the transverse framework are movably connected with lifting hooks respectively, and the bottom end of each lifting hook is movably connected with a clamping plate respectively; and pull rods are movably arranged between the outer side of the cylinder and the three lifting hooks respectively. The problem that the center hanging rod of an existing large wheel stacking outer circle hanging tool falls off can be effectively solved by applying the large wheel stacking outer circle hanging tool.

Description

Technical Field

[0001] The invention belongs to the technical field of welding, and in particular relates to a device and method for preventing a central suspension rod of a wheel stacking outer circle suspension device from falling off. Background Art

[0002] At present, the main core process flow of rail wheel production is: qualified steel ingots - machine tool processing and cutting - heating furnace heating - hydraulic press rolling - cooling bed transportation - stacking and slow cooling - heat treatment quenching - rough processing - fine processing - shot blasting inspection - manual flaw detection - painting and packaging - delivery and use. In the core link of wheel stacking (stacked wheels are generally 5-6 single-piece wheels stacked), external cylindrical hoists are used to transport stacked wheels of various specifications to various processes of wheel production in the factory with cranes.

[0003] Chinese patent CN2490131Y discloses a wheel stacking lifting device for wheel production and transportation. The wheel stacking crane is composed of a lifting ring, a lifting rod, a lifting rod seat, a hook, a conical sleeve, a slip ring, a cross frame, a lifting hook, a pull rod, a clamping plate, etc. The lifting ring and the hook are fixed to the upper and lower ends of the lifting rod seat respectively with bolts and can move. The lifting rod is inserted from the upper end of the lifting rod seat and passes through the conical sleeve with a cylinder at the lower end. The head of the lifting rod is clamped at the lower end of the lifting rod seat. The slip ring is inserted from the outer cylinder of the lower end of the conical sleeve. One end of the cross frame is fixed to the cylinder of the conical sleeve below the slip ring, and the other end thereof is fixed with a hook with bolts. The clamping plate is fixed on the hook, one end of the pull rod is fixed to the end of the lifting rod with a bolt clamp, and the other end of the pull rod is fixed to the hook with a bolt. The wheel stacking crane has a simple and durable structure, is easy to operate, is flexible in lifting the stacked wheels, is not restricted by location, and is a good tool for wheel production and transportation operations. However, since the center boom of the large wheel stack outer circle hoist is not only a key integral spare part of the overall hoist structure, but also frequently bears the gravity of the main body and the wheel stack as well as the pulling force of the crane lifting, in the original design of the center boom of the large hoist, the upper part of the center boom is precisely matched with the threaded hole at the bottom of the boom seat (1 / 3 of the total length) through machining, and the lower part of the center rod is mainly connected to the retracting hook, conical sleeve, slip ring, cross frame, tie rod and fixed by the bottom nut at the lower end of the center rod. During normal lifting, the center rod can meet the bearing capacity of various wheel stacks. However, due to improper operation of the operators and other reasons, the large hoist becomes unstable during full-load lifting. In addition, the wheels are stacked and restored by the large hoist frequently due to impact, as well as the rising and falling of the large hoist in daily work. These will directly affect the wear of the threaded connection between the upper part of the center boom and the lower part of the boom seat. With the passage of long-term lifting, the connecting thread of the center boom of the large hoist is seriously worn, which causes the key connected spare parts of the center boom structure of the large wheel stack outer circle hoist to fall off from time to time, which not only affects the production rhythm of the wheel process, but also creates safety hazards for the equipment. Summary of the invention

[0004] In view of the technical problems existing in the background technology, the present invention provides a device and method for preventing the central hanger rod of a wheel stacking outer circular hanger from falling off, which effectively solves the problem that the central hanger rod of the existing large wheel stacking outer circular hanger falls off, affecting production and causing safety hazards to equipment.

[0005] The technical solution of the present invention to solve the technical problem is as follows:

[0006] According to one aspect of the present invention, there is provided a device for preventing the central suspension rod from falling off of a wheel stacking outer circular suspension device, which comprises a lifting ring, an anti-hook gantry, a fixing nut, a suspension rod seat, a retracting and extending hook, a central suspension rod, a conical sleeve, a sliding ring, a transverse frame, a pulling rod, a hook and a clamping plate; the upper ends of the lifting ring and the retracting and extending hook are movably arranged at the upper and lower ends of the suspension rod seat respectively; the suspension rod seat is vertically provided with a through hole and is sleeved on the outer side of the central suspension rod; the upper end of the central suspension rod is provided with an external thread, and the lower part of the rod body is sleeved with the conical sleeve, The sliding ring and the cross frame have a cylinder at the lower end thereof through a bottom nut; the lower end of the retracting and expanding hook is movably connected to the bottom of the conical sleeve; a fixing nut is installed on the external thread, the top of the anti-unhooking door frame is welded and fixed to the top of the central suspension rod, and the two sides are respectively welded and fixed to the fixing nuts; the cross frame is in a trident shape, and its three outer ends are respectively movably connected to the hooks, and the bottom end of each hook is respectively movably connected to the splint; the pull rods are respectively movably arranged between the outer side of the cylinder and the three hooks.

[0007] Furthermore, the anti-unhooking door frame is machined from 16Mn steel plate with a thickness of 30 mm.

[0008] Furthermore, the anti-unhooking door frame is in a vertical relationship with the lifting ring.

[0009] According to another aspect of the present invention, a method for preventing a central suspension rod of a wheel stacking outer circle suspension device from falling off is provided, which is performed using the central suspension rod anti-falling device described in the above technical solution, and the steps are as follows:

[0010] S1. Assembly of the central suspension rod anti-falling device:

[0011] 1.1) Rotate and install the lifting ring and multiple retracting and expanding hooks on the upper and lower ends of the boom seat, pass the upper part of the central boom through the vertical through hole of the boom seat, install the fixing nut on the external thread at the top of the central boom and make the lower surface of the fixing nut horizontally contact the upper surface of the boom seat, sequentially sleeve the conical sleeve, sliding ring and cross frame on the lower part of the central boom, and rotatably connect the lower end of each retracting and expanding hook with the bottom of the conical sleeve, rotatably install the hooks on the three outer ends of the cross frame, and install the clamping plates on the bottom end of each hook, respectively, rotatably connect one end of the three pull rods to the cylinder, and rotatably connect the other ends to the upper part of the corresponding hook;

[0012] 1.2) The anti-unhooking door frame is manufactured according to the specifications of the fixing nut and the length of the center suspension rod extending out of the suspension rod seat, and grooves are respectively provided on both sides of the lower surface of the top of the anti-unhooking door frame at positions corresponding to the center suspension rod, and grooves are respectively provided on both sides of the inner surface of both sides of the anti-unhooking door frame at positions corresponding to the fixing nut, and the anti-unhooking door frame is arranged on both sides of the fixing nut, so that the grooves on both sides of the center suspension rod and the lower surface of the top of the anti-unhooking door frame form a K-shaped groove for horizontal butt joint of the crossbeam, and the grooves on both sides of the inner surface of the anti-unhooking door frame and the surfaces on both sides of the fixing nut form K-shaped grooves for butt joint of the door legs;

[0013] S2. Preparation before welding:

[0014] 2.1) Welding equipment: CMT cold welding system;

[0015] 2.2) Welding materials: ER50-6 welding wire, φ1.2mm;

[0016] 2.3) Groove size: double-sided K groove;

[0017] 2.4) Welding materials: dissimilar metals Q345 and 45#;

[0018] 2.5) Welding position: flat surfacing;

[0019] 2.6) Auxiliary facilities: sample, magnifying glass, mask, gloves, slag hammer, hammer, chisel, file, wire brush, sandpaper, steel ruler, level, adjustable wrench, straight grinder, angle grinder, wire cutters, hacksaw blade, labor protection supplies;

[0020] 2.7) Cleaning before welding: Use acetone and sandpaper to remove rust, grease and moisture from the welding groove and the surface of the welding wire;

[0021] 2.8) Welding requirements: The cladding layer meets the requirements of compressive and tensile strength;

[0022] 2.9) Welding technical requirements: The weld cladding layer fuses the parent material, the weld has no welding defects and meets the design dimensions;

[0023] 2.10) Assembly and spot fixing: The assembly is spot fixed up and down, left and right without gaps. ER50-6 welding wire is used for positioning welding. The length of the positioning weld is 20~30mm;

[0024] 2.11) Welding process parameters: Welding parameters are determined according to welding equipment, welding materials and welding requirements;

[0025] S3, welding implementation;

[0026] 3.1) First, fix and spot weld the horizontal K-shaped groove of the crossbeam and the contact parts of the K-shaped grooves on both sides of the door legs on the installed anti-unhooking door frame, including the bottom of the anti-unhooking door frame that contacts the upper surface of the boom seat;

[0027] 3.2) During normal welding, place the entire hoist horizontally, and then perform bottom layer welding on any side of the horizontal K-shaped groove of the beam and the K-shaped groove on both sides of the door leg. When welding the horizontal K-shaped groove of the beam, use oxygen-acetylene flame to slightly heat the top of the central suspension rod to 40°C, and then use the small crescent-shaped wire feeding method to weld. After the bottom layer welding of the K-shaped groove on this side is completed, use visual inspection or a 5x magnifying glass to confirm that there are no defects, then turn the entire large hoist 180°, and then perform the bottom layer welding of each K-shaped groove on the reverse side in the same way as above; after the bottom layer welding is completed, turn the large hoist 180° as a whole, and perform the filling welding of each welding layer of each K-shaped groove filling layer on one side, and the wire feeding method is used. The method is an equilateral triangle. After the welding is completed, visual inspection or a 5x magnifying glass is used to confirm that there are no defects, and then the overall large-scale lifting device is turned over 180° to complete the filling welding of each K-shaped groove filling layer and each welding layer on the other side; after the filling layer welding is completed, the overall large-scale lifting device is turned over 180° to weld the K-shaped groove cover layer on one side, and after the cover layer welding on this side is completed, the overall large-scale lifting device is turned over 180° to weld the K-shaped groove cover layer on the other side; after the cover layer welding is completed, the overall large-scale lifting device is turned over 180° and the weld surface is ground with a manual angle grinder to ensure a smooth transition of the weld, and then the large-scale lifting device is turned over 180° as a whole, and the weld surface on the other side is ground using the same method;

[0028] 3.4) After all welding is completed, wait for the weld to cool to room temperature, perform flaw detection, and then spray further. When welding the base layer, the welding current is 180-220A, the arc voltage is 25±1V, and the welding speed is 25±1 cm·min -1 ; When welding the filling layer and the cover layer, the welding current is 220-280A, the arc voltage is 26±1V, and the welding speed is 25±1 cm·min -1 .

[0029] Compared with the prior art, the device and method for preventing the center suspension rod of the wheel stacking outer circle hoist described in the present invention are improved on the basis of the original hoist. While ensuring that the large hoisting device structure and the use are not affected during the lifting process, the center rod 7 is doubly fixed by a fixing nut and an anti-unhooking gantry, which effectively prevents the center suspension rod from falling off. It is not only safe and easy to operate, but also has a low investment cost, meets the actual needs on site, has high work efficiency, and greatly reduces maintenance costs, thus providing protection for the lifting of wheels of various specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the simple welding device of the present invention when in use;

[0031] Figure 2 It is a structural schematic diagram of the simple welding device of the present invention;

[0032] Figure 3 It is a structural schematic diagram of the water cooling box of the oxygen lance in the present invention;

[0033] In the figure: 1. lifting ring; 2. anti-unhooking door frame; 3. fixing nut; 4. external thread; 5. lifting rod seat; 6. retracting and extending hook; 7. center lifting rod; 8. tapered sleeve; 9. sliding ring; 10. cross frame; 11. pull rod; 12. hook; 13. splint; 14. cylinder; 15. bottom nut; 2A. horizontal K-shaped groove for connecting the crossbeam; 2B. K-shaped groove for connecting the two sides of the door leg. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the usual meanings understood by people with general skills in the field to which the present disclosure belongs. "Up", "down", "left", "right", "front", "back" and the like used in the patent application specification and claims of the present disclosure are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship also changes accordingly; "connected" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The parts not described in detail in the present invention are all known technologies of technicians in the field of this technology.

[0035] Embodiment 1:

[0036] like Figure 1-3 As shown, the present invention provides a device for preventing the central suspension rod from falling off of a wheel stacking outer circle suspension device, which comprises a lifting ring 1, an anti-hook gantry 2, a fixing nut 3, a suspension rod seat 5, a retracting and extending suspension hook 6, a central suspension rod 7, a conical sleeve 8, a sliding ring 9, a transverse frame 10, a pull rod 11, a suspension hook 12 and a clamping plate 13; the upper ends of the lifting ring 1 and the retracting and extending suspension hook 6 are movably arranged at the upper and lower ends of the suspension rod seat 5 respectively; the suspension rod seat 5 is vertically provided with a through hole and is sleeved on the outer side of the central suspension rod 7; the upper end of the central suspension rod 7 is provided with an external thread 4, and the lower part of the rod body thereof is sleeved with a conical sleeve in sequence. 8, slip ring 9 and cross frame 10, the lower end of which is provided with a cylinder 14 through a bottom nut 15; the lower end of the retracting and extending hook 6 is movably connected to the bottom of the conical sleeve 8; a fixing nut 3 is installed on the external thread 4, the top of the anti-unhooking door frame 2 is welded and fixed to the top of the central suspension rod 7, and the two sides are respectively welded and fixed to the fixing nuts 3; the cross frame 10 is in a trident shape, and its three outer ends are respectively movably connected with hooks 12, and the bottom end of each hook 12 is respectively movably connected with a clamping plate 13; pull rods 11 are respectively movably arranged between the outer side of the cylinder 14 and the three hooks 12.

[0037] The above-mentioned device for preventing the center boom of the wheel stacking outer circle hoist is an improvement on the wheel stacking crane disclosed in Chinese patent CN2490131Y, namely: keeping the original center boom 7 at the bottom of the boom seat 5 and the components installed on the center boom 7 unchanged, the original boom seat 5 is penetrated from top to bottom by mechanical means, the original center boom 7 is lengthened and the external thread 4 is processed on the top, and the fixing nut 3 of special size is mechanically processed to meet the assembly size and process strength requirements, and then the anti-unhooking door frame 2 is made according to the specifications of the fixing nut 3 and the length of the center boom 7 extending out of the boom seat 5, and a bevel is opened at the corresponding position to be welded and fixed to the top of the center boom 7 and both sides of the fixing nut 3, so as to effectively prevent the center boom 7 from falling off while ensuring that the large-scale hoisting device structure and the use are not affected during the lifting process.

[0038] As a preferred embodiment, the anti-unhooking door frame 2 is machined from 16Mn steel plate with a thickness of 30 mm.

[0039] As a preferred embodiment, the anti-unhooking door frame 2 is in a vertical relationship with the lifting ring 1, which facilitates the welding of the anti-unhooking door frame 2 and the fixing nut 3.

[0040] Embodiment 2:

[0041] The present invention provides a method for preventing a central suspension rod of a wheel stacking outer circle suspension device from falling off, which is performed using the central suspension rod anti-falling device in Example 1, and the steps are as follows:

[0042] S1. Assembly of the central suspension rod anti-falling device:

[0043] 1.1. Rotate and install the lifting ring 1 and multiple retracting and stretching hooks 6 on the upper and lower ends of the boom seat 5, pass the upper part of the central boom 7 through the vertical through hole of the boom seat 5, install the fixing nut 3 on the external thread 4 at the top of the central boom 7 and make the lower surface of the fixing nut 3 horizontally contact the upper surface of the boom seat 5, sequentially sleeve the conical sleeve 8, the slip ring 9 and the cross frame 10 on the lower part of the central boom 7, and rotate and connect the lower end of each retracting and stretching hook 6 with the bottom of the conical sleeve 8, rotate and install the hooks 12 on the three outer ends of the cross frame 10, and install the clamping plates 13 on the bottom end of each hook 12, and rotate and connect one end of the three pull rods 11 with the cylinder 14 respectively, and rotate and connect the other end with the upper part of the corresponding hook 12 respectively;

[0044] 1.2. According to the specifications of the fixing nut 3 and the length of the center suspension rod 7 extending out of the suspension rod seat 5, the anti-unhooking door frame 2 is manufactured, and grooves are respectively provided at positions corresponding to the center suspension rod 7 on both sides of the lower surface of the top of the anti-unhooking door frame 2, and grooves are respectively provided at positions corresponding to the fixing nut 3 on both sides of the inner surface of both sides of the anti-unhooking door frame 2, and the anti-unhooking door frame 2 is arranged on both sides of the fixing nut 3, so that the grooves on both sides of the center suspension rod 7 and the lower surface of the top of the anti-unhooking door frame 2 form a K-shaped groove 2A for horizontal butt joint of the crossbeam, and the grooves on both sides of the inner surface of both sides of the anti-unhooking door frame 2 and the surfaces on both sides of the fixing nut 3 form K-shaped grooves 2B for butt joint of the door legs;

[0045] S2. Preparation before welding:

[0046] 2.1. Welding equipment: CMT cold welding system;

[0047] 2.2, Welding materials: ER50-6 welding wire, φ1.2mm;

[0048] 2.3. Groove size: double-sided K groove;

[0049] 2.4. Welding materials: dissimilar metals Q345 (anti-unhooking door frame 2) and 45# (center suspension rod 7);

[0050] 2.5. Welding position: flat surfacing;

[0051] 2.6. Auxiliary facilities: sample, magnifying glass, mask, gloves, slag hammer, hammer, chisel, file, wire brush, sandpaper, steel ruler, level, adjustable wrench, straight grinder, angle grinder, wire cutters, hacksaw blade, labor protection supplies;

[0052] 2.7. Cleaning before welding: Use acetone and sandpaper to remove rust, grease and moisture from the welding groove and the surface of the welding wire;

[0053] 2.8. Welding requirements: The cladding layer shall meet the requirements of compressive and tensile strength;

[0054] 2.9. Welding technical requirements: The weld cladding layer is fused with the parent material, the weld has no welding defects and meets the design dimensions;

[0055] 2.10. Assembly and spot fixing: The assembly is spot fixed up and down, left and right without gaps. ER50-6 welding wire is used for positioning welding. The length of the positioning weld is 20~30mm;

[0056] 2.11. Welding process parameters: Welding parameters shall be formulated according to welding equipment, welding materials and welding requirements;

[0057] Welding wire model Solder layer Wire diameter / mm Welding current A Arc voltage / v <![CDATA[Welding speed / (cm`min -1 )]]> ER50-6 Base 1.2 180-220 25±1 25±1 ER50-6 Filling cover layer 1.2 220-280 26±1 25±1

[0058] S3, welding implementation;

[0059] 3.1. Considering the need to build up welding on the central boom 7 and boom seat 5, the core key spare parts of large-scale hoisting equipment, in order to prevent a large amount of welding heat input from causing partial or overall deformation of the hoisting equipment, which directly affects the normal use of the hoisting equipment or even causes it to be scrapped, a special cold welding equipment (CMT) is used to perform symmetrical K-shaped groove welding of the horizontal butt K-shaped groove 2A of the crossbeam around the central boom 7 and boom seat 5 and the fixed nut 3 and the butt K-shaped groove 2B on both sides of the door leg; first, the contact parts of the horizontal butt K-shaped groove 2A of the crossbeam and the butt K-shaped groove 2B on both sides of the door leg on the installed anti-unhooking door frame 2, including the bottom of the anti-unhooking door frame 2 that contacts the upper surface of the boom seat 5, are all fixed and spot welded;

[0060] 3.2. During normal welding, place the whole hoist horizontally, and then perform bottom welding on any side of the horizontal K-shaped groove 2A of the beam and the K-shaped groove 2B on both sides of the door leg. Because the center hanger 7 is 45# medium carbon steel, when welding the horizontal K-shaped groove 2A of the beam, when welding the crossbeam of the anti-unhooking door frame 2, use oxygen-acetylene flame to slightly heat the top of the center hanger 7 to 40°C, and then use the small crescent wire feeding method to weld. After all the bottom layers of the K-shaped grooves on this side are welded, use visual inspection or 5x magnifying glass to confirm that there are no defects, then turn the whole large hoist 180°, and then perform the bottom welding of each K-shaped groove on the reverse side in the same way as above; after the bottom layer welding is completed, turn the large hoist 180° as a whole, and perform the bottom welding of each K-shaped groove on one side. For the filling welding of each welding layer of the K-shaped groove filling layer, the wire feeding method is an equilateral triangle. After the welding is completed, visual inspection or a 5-fold magnifying glass is used to confirm that there are no defects, and then the overall large-scale hoist is turned over 180° to complete the filling welding of each welding layer of each K-shaped groove filling layer on the other side; after the welding of the filling layer is completed, the overall large-scale hoist is turned over 180° to weld the cover layer of each K-shaped groove on one side, and after the welding of the cover layer on this side is completed, the overall large-scale hoist is turned over 180° to weld the cover layer of each K-shaped groove on the other side; after the welding of the cover layer is completed, the overall large-scale hoist is turned over 180° and the weld surface is ground with a manual angle grinder to ensure a smooth transition of the weld, and then the large-scale hoist is turned over 180° as a whole, and the weld surface on the other side is ground using the same method;

[0061] 3.4. After all welding is completed, wait for the weld to cool to room temperature, conduct flaw detection, and then spray paint and put it into use.

Claims

1. A device for preventing the central suspension rod from falling off of a wheel stacking outer circle suspension device, characterized in that: It comprises a lifting ring (1), an anti-unhooking door frame (2), a fixing nut (3), a suspension rod seat (5), a retracting and extending lifting hook (6), a central suspension rod (7), a conical sleeve (8), a slip ring (9), a transverse frame (10), a pull rod (11), a lifting hook (12) and a clamping plate (13); the upper ends of the lifting ring (1) and the retracting and extending lifting hook (6) are movably arranged at the upper and lower ends of the suspension rod seat (5) respectively; the suspension rod seat (5) is vertically provided with a through hole and is sleeved on the outer side of the central suspension rod (7); the upper end of the central suspension rod (7) is provided with an external thread (4), the lower part of the rod body of which is sleeved with the conical sleeve (8), the slip ring (9) and the transverse frame (10) in sequence, and the lower end of the rod body is sleeved with the conical sleeve (8), the slip ring (9) and the transverse frame (10) in sequence. A cylinder (14) is provided through the bottom nut (15); the lower end of the retracting and expanding hook (6) is movably connected to the bottom of the conical sleeve (8); a fixing nut (3) is installed on the external thread (4); the top of the anti-unhooking door frame (2) is welded and fixed to the top of the central suspension rod (7), and the two sides are respectively welded and fixed to the fixing nut (3); the cross frame (10) is in a trident shape, and its three outer ends are respectively movably connected to the hooks (12), and the bottom end of each hook (12) is respectively movably connected to the clamp (13); the pull rods (11) are respectively movably provided between the outer side of the cylinder (14) and the three hooks (12).

2. The device for preventing the central suspension rod from falling off of the wheel stacking outer circle suspension device according to claim 1, characterized in that: The anti-unhooking door frame (2) is machined from a 16Mn steel plate with a thickness of 30 mm.

3. The device for preventing the central suspension rod from falling off of the wheel stacking outer circle suspension device according to claim 1, characterized in that: The anti-unhooking door frame (2) is in a vertical relationship with the lifting ring (1).

4. A method for preventing the central suspension rod of a wheel stacking outer circle suspension device from falling off, characterized in that: The central suspension rod anti-falling device according to any one of claims 1 to 3 is used, and the steps are as follows: S1. Assembly of the central suspension rod anti-falling device: 1.1) Rotate and install the lifting ring (1) and a plurality of retracting and extending lifting hooks (6) on the upper and lower ends of the suspension rod seat (5), pass the upper part of the central suspension rod (7) through the vertical through hole of the suspension rod seat (5), install the fixing nut (3) on the external thread (4) at the top of the central suspension rod (7) so that the lower surface of the fixing nut (3) horizontally contacts the upper surface of the suspension rod seat (5), and sequentially sleeve the conical sleeves on the lower part of the central suspension rod (7). (8), a slip ring (9) and a transverse frame (10), and the lower end of each of the retracting and extending hooks (6) is rotatably connected to the bottom of the conical sleeve (8), the hooks (12) are rotatably installed on the three outer ends of the transverse frame (10), and the clamping plates (13) are respectively installed on the bottom ends of each hook (12), and one end of the three pull rods (11) is rotatably connected to the cylinder (14) and the other end is rotatably connected to the upper part of the corresponding hook (12); 1.2) The anti-unhooking door frame (2) is manufactured according to the specifications of the fixing nut (3) and the length of the central suspension rod (7) extending from the suspension rod seat (5), and grooves are respectively provided at positions corresponding to the central suspension rod (7) on both sides of the top lower surface of the anti-unhooking door frame (2), and grooves are respectively provided at positions corresponding to the fixing nut (3) on both sides of the inner surface of both sides of the anti-unhooking door frame (2), and the anti-unhooking door frame (2) is arranged on both sides of the fixing nut (3), so that the grooves on both sides of the central suspension rod (7) and the top lower surface of the anti-unhooking door frame (2) form a K-shaped groove (2A) for horizontal butt joint of the crossbeam, and the grooves on both sides of the inner surface of both sides of the anti-unhooking door frame (2) and the surfaces on both sides of the fixing nut (3) form K-shaped grooves (2B) for butt joint of the door legs; S2. Preparation before welding: 2.1) Welding equipment: CMT cold welding system; 2.2) Welding materials: ER50-6 welding wire, φ1.2mm; 2.3) Groove size: double-sided K groove; 2.4) Welding materials: dissimilar metals Q345 and 45#; 2.5) Welding position: flat surfacing; 2.6) Auxiliary facilities: sample, magnifying glass, mask, gloves, slag hammer, hammer, chisel, file, wire brush, sandpaper, steel ruler, level, adjustable wrench, straight grinder, angle grinder, wire cutters, hacksaw blade, labor protection supplies; 2.7) Cleaning before welding: Use acetone and sandpaper to remove rust, grease and moisture from the welding groove and the surface of the welding wire; 2.8) Welding requirements: The cladding layer meets the requirements of compressive and tensile strength; 2.9) Welding technical requirements: The weld cladding layer fuses the parent material, the weld has no welding defects and meets the design dimensions; 2.10) Assembly and spot fixing: The assembly is spot fixed up and down, left and right without gaps. ER50-6 welding wire is used for positioning welding. The length of the positioning weld is 20~30mm; 2.11) Welding process parameters: Welding parameters are determined according to welding equipment, welding materials and welding requirements; S3, welding implementation; 3.1) First, on the installed anti-unhooking door frame (2), the horizontal butt joint K-shaped groove (2A) of the cross beam and the contact part of the K-shaped groove (2B) on both sides of the door leg, including the bottom of the anti-unhooking door frame (2) that contacts the upper surface of the suspension rod seat (5), are all fixed and spot welded; 3.2) During normal welding, the entire hoist is placed horizontally, and then the bottom layer welding is first performed on any side of the horizontal K-shaped groove (2A) of the crossbeam and the K-shaped groove (2B) on both sides of the door leg. When welding the horizontal K-shaped groove (2A) of the crossbeam, the top of the central suspension rod (7) is slightly heated to 40°C using an oxygen-acetylene flame, and then the small crescent wire feeding method is used for welding. After the bottom layer welding of the K-shaped groove on this side is completed, it is confirmed that there are no defects by visual inspection or a 5x magnifying glass. Then, the entire large hoist is turned over 180°, and the bottom layer welding of each K-shaped groove on the reverse side is performed in the same manner as above; after the bottom layer welding is completed, the large hoist is turned over 180° as a whole, and the filling layer of each K-shaped groove on one side is performed. Filling welding, the wire feeding method is an equilateral triangle. After welding is completed, visual inspection or a 5x magnifying glass is used to confirm that there are no defects, and then the overall large-scale hoist is turned over 180° to complete the filling welding of each K-shaped groove filling layer and each welding layer on the other side; after the filling layer welding is completed, the overall large-scale hoist is turned over 180° to weld the K-shaped groove cover layer on one side, and after the cover layer welding on this side is completed, the overall large-scale hoist is turned over 180° to weld the K-shaped groove cover layer on the other side; after the cover layer welding is completed, the overall large-scale hoist is turned over 180° and the weld surface is ground with a manual angle grinder to ensure a smooth transition of the weld, and then the large-scale hoist is turned over 180° as a whole, and the weld surface on the other side is ground using the same method; 3.4) After all welding is completed, wait for the weld to cool to room temperature, perform flaw detection, and then spray paint and put it into use.

5. The method according to claim 3, characterized in that: The single-sided grooves of the horizontal butt joint K-shaped groove (2A) of the crossbeam and the butt joint K-shaped grooves (2B) on both sides of the door legs are both 30°.

6. The method according to claim 3, characterized in that: When welding the base layer, the welding current is 180-220A, the arc voltage is 25±1V, and the welding speed is 25±1 cm·min -1 ; When welding the filling layer and the cover layer, the welding current is 220-280A, the arc voltage is 26±1V, and the welding speed is 25±1 cm·min -1 .

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