Multi-model bolt elastic limiting device

Abstract

The invention relates to an elastic limiting device for multi-model bolts. The elastic limiting device comprises a groove mold, a torsion spring, an outer protective shell, a baffle and a plug pin buckle. Torsion force provided by the torsion spring continuously acts on the nut, looseness of the bolt is limited to a great extent, fastening between the nut and the bolt is guaranteed, and safety of a tower crane system is improved. Nuts of various specifications can be nested through the groove mold, fastening and limiting of bolts of various sizes and models are achieved, repeated switching of equipment in the construction process is avoided, and the adaptability and compatibility of the device are improved. The torsion spring is adopted to provide continuous torsion force, and even if the nut is loosened under the action of dynamic load, the nut can be reset under the action of the continuous torsion force; meanwhile, compared with the mode that the nut is welded and fixed, the elasticity of the whole mechanism is increased through the torsion spring, and when large dynamic load impact is faced, the device provides a certain buffer space, and brittle fracture of the screw and the nut is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of construction equipment safety, in particular to a multi-model bolt elastic limiting device. BACKGROUND

[0002] The assembled steel structure tower crane adopts an assembled steel structure, that is, the main structure of the tower crane (such as a standard section, a hoisting arm, a balance arm, a tower cap, a rotating tower body, a climbing sleeve frame, etc.) is a modular design, a steel structure component precast in a factory, and assembled at a construction site.

[0003] The current assembled steel structure tower crane foundation mainly adopts a multi-layer steel composite system, and the connection between the steel layers and the assembled fixing of the steel lattice column are realized through high-strength bolts. Compared with the traditional welded foundation, it has the advantages of high construction efficiency and reusability, but there are some technical defects in actual application: 1. Pre-tightening force attenuation risk: due to the limitation of construction conditions, high-strength bolts (such as 8.8 M24 bolts) often cannot reach the design pre-tightening torque, and the pre-tightening force attenuation rate can reach 15%-20% within 50 hours under dynamic load; 2. Dynamic loosening hazard: the alternating load generated by the operation of the tower crane easily causes the progressive loosening of the nut-bolt, leading to the redistribution of internal forces of the structure, causing deformation of the steel and even overturning of the tower crane; 3. High maintenance cost: the current manual inspection and tightening method requires high-frequency maintenance (conventional cycle ≤72 hours), increasing labor costs, and there are maintenance blind spots.

[0004] Existing solutions such as double-nut anti-loosening and thread glue fixing also have problems such as poor detachability and insufficient fatigue resistance, and the welding fixing method violates the core advantage of reusability of the assembled structure, therefore, there is an urgent need for a multi-model bolt elastic limiting device to adapt to the dynamic tightening and retaining technology of bolt connection under dynamic load. SUMMARY

[0005] 1. Technical problems solved To solve the above technical problems, the present application provides a multi-model bolt elastic limiting device.

[0006] (II) Technical solutions Based on this, the present application provides the following technical solutions: a multi-model bolt elastic limiting device, comprising a groove mold, a torsion spring, an outer protective shell, a baffle, and a latch; The groove mold is embedded and installed at the inner lower end of the outer protective shell, the groove mold is inserted with the lower right end of the torsion spring, the torsion spring is fixed with the upper left end of the outer protective shell, the inner lower end of the outer protective shell is fixed with the baffle, and the left and right sides of the outer protective shell are oppositely provided with the latches.

[0007] Preferably, the baffle is in a circular ring structure, and the baffle is located at the bottom of the groove mold, facilitating the limiting of the groove mold.

[0008] Preferably, the groove mold is provided with a stepped hexagonal opening, achieving nested cooperation with various types of standard nuts, the groove mold is close to the inner wall of the outer protective shell, the groove mold moves vertically along the inner wall of the outer protective shell, and the groove mold is movably connected with the inner wall of the outer protective shell.

[0009] Preferably, the pre-tightening torque of the torsion spring is -N·m, and the torsion spring is located at the upper end inside the outer protective shell.

[0010] Preferably, it also includes a bolt, a nut, a gasket, a steel structure tower crane foundation bottom plate, a tower crane foundation main beam, a bolt not reinforced with a limiting device, a bolt reinforced with a limiting device, a foundation platform, and a movable adjusting mechanism. The top of the bolt penetrates the steel structure tower crane foundation bottom plate, and the middle of the bolt and the nut is threadedly connected. The joint of the bolt and the nut is provided with a gasket. The top of the steel structure tower crane foundation bottom plate is fixed with the tower crane foundation main beam. The left front end of the top of the steel structure tower crane foundation bottom plate is provided with a bolt not reinforced with a limiting device. The right front end of the steel structure tower crane foundation bottom plate is provided with a bolt reinforced with a limiting device. The bottom of the steel structure tower crane foundation bottom plate is provided with a foundation platform. The bolt catch is installed on the top of the steel structure tower crane foundation bottom plate. The nut is embedded in the bottom inside of the groove mold. The lower end of the outer protective shell is provided with a movable adjusting mechanism.

[0011] Preferably, the bolt catch includes a metal bolt, a bolt catch, a push rod, a return spring, a push block, and a top support steel ball. The metal bolt is inserted into the lower right end of the outer protective shell. The top of the metal bolt is clamped with the bolt catch. The right end of the metal bolt penetrates the push rod. The left end of the push rod is fixed with the push block. The push rod penetrates the middle of the return spring, and the right end of the return spring is fixed with the push rod. The left end of the return spring is fixed with the metal bolt.

[0012] Preferably, the gasket is provided with two groups, and the gaskets are stacked with each other. The bolt penetrates the middle of the two groups of gaskets.

[0013] Preferably, the cross section of the metal bolt is in an L-shaped structure, and the metal bolt is slidably connected with the inside of the bolt catch, facilitating the adjustment of the position of the metal bolt, so that the metal bolt is slidably embedded in the inside of the side end of the outer protective shell.

[0014] Preferably, the bottom of the bolt catch is fixed with the steel structure tower crane foundation bottom plate, and the bolt catch is provided with two groups, facilitating the buckling positioning with the metal bolt. In this way, the outer protective shell can be fixed on the top of the steel structure tower crane foundation bottom plate.

[0015] Preferably, the upper left end and the lower right end of the torsion spring are both provided with extension rods, and the cross-section of the extension rods is an L-shaped structure, which is convenient for fixing the torsion spring, and the torsion spring can be equipped with a digital torque display, which is convenient for displaying the torsion on the torsion spring. The movable adjustment mechanism includes a support ring, a guide ring, an adjustment sleeve, a positioning hole, and a spiral locking sleeve. The support ring is fixed to the bottom of the outer protective shell, and the support ring is fixed to the middle of the guide ring. The inner lower end of the adjustment sleeve is movably connected to the guide ring, and the adjustment sleeve is movably matched with the outer side of the outer protective shell. Positioning holes are relatively provided at the front and rear ends of the adjustment sleeve, the inner side of the spiral locking sleeve is threadedly matched with the outer protective shell, and the spiral locking sleeve is nested in the top of the adjustment sleeve.

[0016] (3) Beneficial effects Compared with the prior art, the present invention provides a multi-model bolt elastic limit device with the following beneficial effects: 1. This multi-model bolt elastic limit device continuously acts on the nut through the torsional force provided by the torsion spring, which greatly limits the loosening of the bolt, ensures the tightness between the nut and bolt, improves the safety of the tower crane system, and meets the requirements of safe construction on the construction site.

[0017] 2. This multi-model bolt elastic limit device can be nested with nuts of various specifications through a groove mold, realizing the tightening limit of bolts of multiple sizes and models, avoiding repeated switching of equipment during construction, and improving the adaptability and compatibility of the device.

[0018] 3. Compared with the traditional manual inspection and tightening of nuts, the application of this multi-model bolt elastic limit device saves manpower and helps to improve the economic benefits of engineering construction.

[0019] 4. This multi-model bolt elastic limiter uses a torsion spring to provide continuous torsional force. Even if the nut loosens under dynamic load, it can be reset under the continuous torsional force. Compared to welding the nut, the presence of the spring increases the elasticity of the entire mechanism. When faced with large dynamic loads, the device provides a certain buffer space to prevent brittle fracture of the screw and nut, improving the safety of the tower crane system. It is also reusable, environmentally friendly, and saves construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the cross-sectional structure of the elastic limiting device of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the groove mold of the present invention; Figure 4 This is a diagram showing the use scenario of the tower crane foundation of the present invention; Figure 5 This is a schematic diagram of the internal structure of the outer protective shell of the present invention; Figure 6 This is a schematic diagram of the top view of the elastic limiting device of the present invention; Figure 7 This is a schematic diagram of the cross-sectional structure of the latch buckle of the present invention; Figure 8 This is a schematic diagram of the three-dimensional structure of the movable adjustment mechanism of the present invention; Figure 9 It is a schematic diagram of the cross-sectional structure of the movable adjustment mechanism of the present invention.

[0021] In the figure: 1. groove mold, 2. torsion spring, 3. outer protective shell, 4. baffle, 5. latch buckle, 6. bolt, 7. nut, 8. gasket, 9. steel structure tower crane foundation base plate, 10. tower crane foundation main beam, 11. bolts not reinforced with limit devices, 12. bolts reinforced with limit devices, 13. foundation platform, 14. movable adjustment mechanism, 51. metal latch, 52. latch buckle, 53. push rod, 54. reset spring, 55. push block, 56. top support steel ball, 141. support ring, 142. guide ring, 143. adjustment sleeve, 144. positioning hole, 145. spiral locking sleeve. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 A multi-model bolt elastic limit device includes a groove mold 1, a torsion spring 2, an outer protective shell 3, a baffle 4, and a latch buckle 5; the groove mold 1 is embedded and installed in the inner lower end of the outer protective shell 3, the groove mold 1 is plugged into the lower right end of the torsion spring 2, the torsion spring 2 is fixed to the upper left end of the outer protective shell 3, the inner lower end of the outer protective shell 3 is fixed with a baffle 4, and the left and right sides of the outer protective shell 3 are oppositely arranged with latch buckles 5.

[0024] In some embodiments, the baffle 4 is annular in structure, and the baffle 4 is located at the bottom of the groove mold 1, which is convenient for limiting the groove mold 1. The groove mold 1 has a stepped hexagonal opening to achieve nesting with various types of standard nuts. The groove mold 1 is close to the inner wall of the outer protective shell 3, and the groove mold 1 moves vertically along the inner wall of the outer protective shell 3. The groove mold 1 is movably connected to the inner wall of the outer protective shell 3. The pre-tightening torque of the torsion spring 2 is 50-1000N·m, and the torsion spring 2 is located at the upper end of the inner part of the outer protective shell 3. Extension rods are provided at the upper left and lower right ends of the torsion spring 2, and the cross-section of the extension rods is L-shaped, which is convenient for fixing the torsion spring 2. The torsion spring 2 can be equipped with a digital torque display to facilitate the display of the torsion on the torsion spring 2. The outer protective shell 3 is a stainless steel shell structure. The digital torque display is an electronic instrument used to accurately measure, display and record the torque value applied during the tightening of bolts or nuts. It is usually used as the core component of a torque wrench or torque tool and is a vital tool in modern industrial assembly, equipment maintenance and quality control.

[0025] See also Figure 4 A multi-model bolt elastic limit device also includes bolts 6, nuts 7, gaskets 8, steel structure tower crane foundation bottom plate 9, tower crane foundation main beam 10, bolts 11 not reinforced with limit devices, bolts 12 reinforced with limit devices, foundation platforms 13, and movable adjustment mechanisms 14. The top of the bolt 6 passes through the steel structure tower crane foundation bottom plate 9, and the middle thread of the bolt 6 and the nut 7 are matched. A gasket 8 is provided at the connection between the bolt 6 and the nut 7. The steel structure tower crane foundation bottom plate 9 and the tower crane are connected. The top of the foundation main beam 10 is fixed, the top left front end of the steel structure tower crane foundation base plate 9 is provided with a bolt 11 that is not reinforced with a limiting device, the right front end of the steel structure tower crane foundation base plate 9 is provided with a bolt 12 that is reinforced with a limiting device, and the bottom of the steel structure tower crane foundation base plate 9 is installed with a foundation platform 13, the pin buckle 5 is installed on the top of the steel structure tower crane foundation base plate 9, the nut 7 is embedded in the bottom inner side of the groove mold 1, and the lower end of the outer protective shell 3 is provided with a movable adjustment mechanism 14.

[0026] In some embodiments, there are two groups of gaskets 8, and the gaskets 8 are arranged in a superimposed manner. The bolt 6 runs through the middle of the two groups of gaskets 8. The bolt 6 is a fastener with an external thread and is usually used in conjunction with a nut 7 (with an internal thread). The clamping force generated by tightening connects two or more components together. The bolt 6 includes a bolt head, a screw rod, and a thread. The bolt head provides a force surface during tightening. Common shapes include hexagonal heads, hexagonal socket heads, round heads, square heads, etc. Large hexagonal heads are most commonly used in steel structures. The screw rod is a rod with an external thread. The thread is a spiral protrusion on the screw rod, which engages with the internal thread of the nut to transmit force. Coarse threads are commonly used in steel structures. Nut 7 is a fastener with internal threads, used in conjunction with bolt 6 (with external threads). Tightening bolt 6 generates axial pretension, thereby forming a strong clamping force between the steel structure tower crane foundation base plate 9 and the tower crane foundation main beam 10, achieving a reliable mechanical connection. Nut 7 can be a hexagonal nut, the most commonly used, providing six load-bearing surfaces for easy wrench tightening. Nut 7 is embedded in the bottom inner side of the groove mold 1 and fits into the stepped hexagonal opening of the groove mold 1. Washer 8 is a thin, sheet-like component installed below the head of bolt 6 or nut 7, positioned between the surfaces of the connecting parts. In high-strength bolt connections in prefabricated steel structures, washers, although small, play a vital role in the reliability, corrosion resistance, and load transfer of the connection. The steel structure tower crane foundation base plate 9 is the core load-bearing component of the tower crane support system, directly bearing all loads transmitted by the tower crane (deadweight, hanging weight, wind load, overturning moment, etc.), and distributing them safely and evenly to the foundation platform 13. Its design and construction quality are directly related to the stability, safety and service life of the tower crane. It is used to transmit the huge vertical pressure, horizontal force, bending moment and torque generated by the tower crane to the foundation platform 13. The tower crane foundation main beam 10 is the core force transmission component of the tower crane foundation support system. Especially in the cross-beam foundation or lattice foundation, it plays a key role in dispersing the huge load (pressure, tension, bending moment) transmitted by the tower crane legs to the foundation platform 13. The foundation platform 13 refers to a horizontal bearing surface that has been specially treated and has sufficient bearing capacity and stability, which is used to safely support the superstructure or equipment.

[0027] See also Figure 7, a multi-model bolt elastic limit device, the latch buckle 5 includes a metal latch 51, a latch buckle 52, a push rod 53, a reset spring 54, a push block 55, and a supporting steel ball 56. The metal latch 51 is plugged into the lower right end of the outer protective shell 3, and the top of the metal latch 51 is snapped into the latch buckle 52. The right end of the metal latch 51 is penetrated by a push rod 53, and the left end of the push rod 53 is fixed to the push block 55. The push rod 53 passes through the middle of the reset spring 54, and the right end of the reset spring 54 is fixed to the push rod 53. The left end of the return spring 54 is fixed to the metal latch 51. The cross-section of the metal latch 51 is L-shaped, and the metal latch 51 slides with the inner side of the latch buckle 52, which is convenient for adjusting the position of the metal latch 51 so that the metal latch 51 is slidably embedded in the inner side of the side end of the outer protective shell 3. The bottom of the latch buckle 52 is fixed to the steel structure tower crane foundation base plate 9, and there are two groups of latch buckles 52, which are convenient for buckling and positioning with the metal latch 51. In this way, the outer protective shell 3 can be fixed to the top of the steel structure tower crane foundation base plate 9.

[0028] In this application, the metal latch 51 is a simple mechanical device that can be quickly inserted into a hole or sleeve to position, connect or lock components. In the fields of engineering and assembly (including tower crane systems), it has become a key safety connection element due to its simple structure, easy assembly and disassembly, and high reliability.

[0029] See also Figure 8-Figure 9 , a multi-type bolt elastic limiting device, the movable adjustment mechanism 14 includes a support ring 141, a guide ring 142, an adjustment sleeve 143, a positioning hole 144, and a spiral locking sleeve 145. The support ring 141 is fixed to the bottom of the outer protective shell 3, the support ring 141 is fixed to the middle of the guide ring 142, the inner lower end of the adjustment sleeve 143 is movably connected to the guide ring 142, and the adjustment sleeve 143 is movably matched with the outer side of the outer protective shell 3. Positioning holes 144 are relatively provided at the front and rear ends of the adjustment sleeve 143, the inner side of the spiral locking sleeve 145 is threadedly matched with the outer protective shell 3, and the spiral locking sleeve 145 is nested in the top of the adjustment sleeve 143.

[0030] In some embodiments, after the bolt 6 is locked, it is necessary to pre-fix the latch buckle 52 to the top of the steel structure tower crane foundation base plate 9. In order to prevent the metal latch 51 from being misaligned with the positioning hole 144 and affecting the installation efficiency, the adjusting sleeve 143 can be rotated to rotate the adjusting sleeve 143 on the guide ring 142 and adjusted to a suitable position, so that the positioning hole 144 can be in the same horizontal direction as the metal latch 51. After the adjustment is completed, the spiral locking sleeve 145 is rotated clockwise to make the spiral locking sleeve 145 threadedly engaged with the outer protective shell 3, thereby transmitting it to the lower end and nesting the top of the adjusting sleeve 143, thereby realizing the adjustment and positioning of the position of the adjusting sleeve 143. In summary, when in use, the foundation platform 13 is first constructed to safely support the steel structure tower crane foundation bottom plate 9 and the tower crane foundation main beam 10; After the construction is completed, a steel structure tower crane foundation base plate 9 is built on the top of the foundation platform 13, and the foundation platform 13 and the steel structure tower crane foundation base plate 9 are locked and fixed by bolts 6 and nuts 7, and a gasket 8 is placed at the connection between the bolts 6 and nuts 7 to increase the connection reliability, corrosion resistance and load transmission of the bolts 6 and nuts 7; After pre-tightening the bolt 6, fix the latch buckle 52 on the front and rear ends of the bolt 6 in advance, and fix the latch buckle 52 to the top of the steel structure tower crane foundation base plate 9, vertically insert the outer protective shell 3 into the nut 7, and embed the nut 7 into the groove of the corresponding size of the groove mold 1; Next, the torque loading stage is carried out. The outer protective shell 3 is rotated clockwise by an angle of 30°-180°, so that the torsion spring 2 generates the designed torque. The torque can be displayed and calibrated through the digital torque display. Then enter the locking stage, while the metal latch 51 is embedded in the inner side of the positioning hole 144 through the latch buckle 52, the push rod 53 is pushed to the left end, so that the push rod 53 presses the return spring 54 to produce deformation and contraction, and at the same time, the push block 55 moves synchronously to the left end, so that the supporting steel ball 56 is embedded in the metal latch 51 in the groove at the left end of the push block 55. When the left end of the metal latch 51 is embedded in the positioning hole 144, the pushing force on the push rod 53 is released, and the elastic potential energy of the deformation is restored by the return spring 54, which drives the push block 55 to reset and push the supporting steel ball 56 to the outer side of the metal latch 51. With a "click" sound, it is prompted to be in place, forming a mechanical lock, and the outer protective shell 3, i.e., the internal components, can be fixed to the steel structure tower crane foundation bottom plate 9; When rotational displacement of the nut 7 is detected, the torque of the torsion spring 2 is automatically compensated to a preset value. Even if the nut 7 becomes loose under the action of a dynamic load, it can be reset under the action of a continuous torsional force. At the same time, compared with welding the nut 7, the presence of the torsion spring 2 increases the elasticity of the entire mechanism. When faced with a large dynamic load impact, the torsion spring 2 provides a certain buffer space to avoid brittle fracture of the nut 7 and the bolt 6, thereby improving the safety of the tower crane system. The torsional force provided by the torsion spring 2 continuously acts on the nut 7, which greatly limits the loosening of the bolt 6 and ensures the tightness between the nut 7 and the bolt 6.

[0031] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A multi-type bolt elastic limit device, characterized by: It includes a groove mold (1), a torsion spring (2), an outer protective shell (3), a baffle (4), and a latch buckle (5); The groove mold (1) is embedded in the lower end of the inner part of the outer protective shell (3), the groove mold (1) is plugged into the lower right end of the torsion spring (2), the torsion spring (2) is fixed to the upper left end of the outer protective shell (3), a baffle (4) is fixed to the lower end of the inner part of the outer protective shell (3), and latch buckles (5) are arranged on the left and right sides of the outer protective shell (3).

2. A multi-type bolt elastic limiting device according to claim 1, characterized in that: The baffle (4) is in a circular ring structure, and the baffle (4) is located at the bottom of the groove mold (1).

3. The multi-type bolt elastic limiting device according to claim 1, characterized in that: The groove mold (1) has a stepped hexagonal opening, the groove mold (1) is closely attached to the inner wall of the outer protective shell (3), the groove mold (1) moves vertically along the inner wall of the outer protective shell (3), and the groove mold (1) is movably connected to the inner wall of the outer protective shell (3).

4. The multi-type bolt elastic limiting device according to claim 1, characterized in that: The pre-tightening torque of the torsion spring (2) is 50-1000 N·m, and the torsion spring (2) is located at the inner upper end of the outer protective shell (3).

5. The multi-model bolt elastic limiting device according to claim 1, characterized in that: The invention also includes bolts (6), nuts (7), washers (8), a steel structure tower crane foundation base plate (9), a tower crane foundation main beam (10), bolts (11) not reinforced with a limiting device, bolts (12) reinforced with a limiting device, a foundation platform (13), and a movable adjustment mechanism (14). The top of the bolt (6) passes through the steel structure tower crane foundation base plate (9), and the middle thread of the bolt (6) and the nut (7) are matched. A washer (8) is provided at the connection between the bolt (6) and the nut (7). The steel structure tower crane foundation base plate (9) and the tower crane foundation main beam (10) are connected. ), the top of the steel structure tower crane foundation base plate (9) is fixed, the left front end of the top of the steel structure tower crane foundation base plate (9) is provided with a bolt (11) that is not reinforced with a limiting device, the right front end of the steel structure tower crane foundation base plate (9) is provided with a bolt (12) that is reinforced with a limiting device, the bottom of the steel structure tower crane foundation base plate (9) is installed with a foundation platform (13), the latch buckle (5) is installed on the top of the steel structure tower crane foundation base plate (9), the nut (7) is embedded in the bottom inner side of the groove mold (1), and the lower end of the outer protective shell (3) is provided with a movable adjustment mechanism (14).

6. The multi-type bolt elastic limiting device according to claim 5, characterized in that: The latch buckle (5) includes a metal latch (51), a latch buckle (52), a push rod (53), a return spring (54), a push block (55), and a supporting steel ball (56). The metal latch (51) is plugged into the lower right end of the outer protective shell (3). The top of the metal latch (51) is snap-fitted with the latch buckle (52). The right end of the metal latch (51) is penetrated by a push rod (53). The left end of the push rod (53) is fixed to the push block (55). The push rod (53) is penetrated by the middle of the return spring (54), and the right end of the return spring (54) is fixed to the push rod (53). The left end of the return spring (54) is fixed to the metal latch (51).

7. The multi-model bolt elastic limiting device according to claim 5, characterized in that: There are two groups of gaskets (8) in total, and the gaskets (8) are stacked on top of each other, and the bolts (6) pass through the middle of the two groups of gaskets (8).

8. The multi-model bolt elastic limiting device according to claim 5, characterized in that: The cross section of the metal latch (51) is L-shaped, and the metal latch (51) is slidably engaged with the inner side of the latch buckle (52).

9. The multi-model bolt elastic limiting device according to claim 5, characterized in that: The bottom of the latch buckle (52) is fixed to the steel structure tower crane foundation bottom plate (9), and two groups of latch buckles (52) are provided.

10. The multi-type bolt elastic limiting device according to claim 1, characterized in that: The upper left end and the lower right end of the torsion spring (2) are both provided with extension rods, and the cross-sections of the extension rods are both L-shaped structures. The movable adjustment mechanism (14) comprises a support ring (141), a guide ring (142), an adjustment sleeve (143), a positioning hole (144), and a spiral locking sleeve (145). The support ring (141) is fixed to the bottom of the outer protective shell (3), and the support ring (141) is fixed to the middle of the guide ring (142). The inner lower end of the adjustment sleeve (143) is movably connected to the guide ring (142), and the adjustment sleeve (143) is movably matched with the outer side of the outer protective shell (3). The front and rear ends of the adjustment sleeve (143) are relatively provided with positioning holes (144). The inner side of the spiral locking sleeve (145) is threadedly matched with the outer protective shell (3), and the spiral locking sleeve (145) is nested in the top of the adjustment sleeve (143).

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