Corrugated annular section cylinder outward turning energy absorption device

Abstract

A corrugated annular section cylinder outward turning energy absorption device comprises a conical turning table, a straight line pipe type energy absorption component, a round top plate, an energy absorption round pipe and a flower-shaped supporting plate. The circular top plate is fixedly arranged at the top end of the straight-line tubular energy-absorbing component, the energy-absorbing circular tube is coaxially located in the straight-line tubular energy-absorbing component, and the top end of the energy-absorbing circular tube is fixedly connected to the lower surface of the circular top plate. The conical overturning table is located under the straight-line tubular energy-absorbing component, the small-diameter end of the conical overturning table is upwards inserted into a lower-end tube opening of the straight-line tubular energy-absorbing component, the conical overturning table and the straight-line tubular energy-absorbing component are coaxially distributed, and an energy-absorbing round tube limiting groove is formed in the upper surface of the conical overturning table. Deformation energy absorption is conducted through expansion and overturning of the straight line pipe type energy absorption component, interference of boundary constraint is avoided, the flexural rigidity of the energy absorption component is greatly improved, regulation and control of deformation resistance are achieved through the combined action of self-compression deformation energy absorption of the energy absorption circular pipe and overturning energy absorption of the straight line pipe type energy absorption component, and under axial impact compression, the energy absorption effect of the energy absorption circular pipe is improved. Abnormal deformation of expansion, buckling, stacking and instability of the energy absorption component is effectively avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine safety support, and in particular relates to a corrugated annular cross-section cylinder eversion energy absorption device. Background Art

[0002] Rock burst is the main dynamic disaster in coal mines and a global mining problem. At present, rock burst mainly occurs in tunnels, so the anti-shock design of effective tunnel support system has become the most urgent problem facing mines with rock burst.

[0003] In order to improve the anti-impact and anti-shock capabilities of tunnel support, many mines will use high-strength tunnel hydraulic supports to strengthen the support of the tunnel, thereby significantly reducing tunnel impact damage incidents, especially when the tunnel hydraulic supports are equipped with energy absorption devices. When impact ground pressure occurs, the energy absorption devices play a good role in absorbing and displacing, and the anti-impact effect is more obvious.

[0004] Since tunnel hydraulic supports usually regulate their own pressure by releasing pressure through the flow valve of the hydraulic column to achieve self-protection, the pressure relief speed will be subject to certain restrictions. Only when the surrounding rock is quasi-statically loaded or under relatively small vibration impact conditions, the discharge and pressure relief speed of the flow valve can meet the requirements. Once encountering impact ground pressure with large impact energy, the flow valve will be damaged by the instantaneous high pressure, resulting in the flow valve being unable to regulate its own pressure by pressure relief. In severe cases, it may cause the hydraulic column to explode or bend, leading to the overall tipping and damage of the hydraulic support.

[0005] Therefore, when the energy-absorbing device is used in conjunction with the tunnel hydraulic support, the energy-absorbing device can be used to compensate for the slow pressure relief speed of the flow valve of the hydraulic column, thereby greatly improving the safety factor of the hydraulic support and the tunnel support system.

[0006] At present, the energy absorption devices widely used in tunnel hydraulic supports are usually designed based on pre-creased energy absorption components. When impact ground pressure occurs, the pre-creased energy absorption components will deform and absorb energy according to the preset creases. Although pre-creased energy absorption components have advantages such as high energy absorption rate and high space utilization, they are easily disturbed by boundary constraints because their bearing boundaries are quadrilaterals, which makes them prone to abnormal deformation during the buckling process, and ultimately causes the actual energy absorption effect to fail to reach or be far from the design target. Summary of the invention

[0007] Aiming at the problems existing in the prior art, the present invention provides an external turning energy absorption device for a corrugated annular cross-section cylinder, which adopts an innovatively designed straight-grooved tube energy absorption member. Compared with the traditional pre-folded energy absorption member, the straight-grooved tube energy absorption member undergoes expansion and flipping deformation to absorb energy, avoiding the interference of boundary constraints, greatly improving the bending stiffness of the energy absorption member, and realizing the regulation of the deformation resistance through the combined action of the self-compression deformation energy absorption of the energy absorption circular tube and the flipping energy absorption of the straight-grooved tube energy absorption member. Under axial impact compression, it can effectively avoid abnormal deformations such as expansion buckling and stacking instability of the energy absorption member, and reliably ensure that the actual energy absorption effect of the energy absorption member meets the design objectives.

[0008] To achieve the above object, the present invention adopts the following technical solutions: An external turning energy absorption device for a corrugated annular cross-section cylinder, comprising a conical turning table, a straight-grooved tube energy absorption member, a circular top plate and an energy absorption circular tube; the straight-grooved tube energy absorption member is arranged vertically; the circular top plate is horizontally and fixedly arranged at the top end of the straight-grooved tube energy absorption member, and the circular top plate and the straight-grooved tube energy absorption member are coaxially distributed; the conical turning table is located directly below the straight-grooved tube energy absorption member, and the small-diameter end of the conical turning table is inserted upward into the lower pipe orifice of the straight-grooved tube energy absorption member, and the conical turning table and the straight-grooved tube energy absorption member are coaxially distributed; the energy absorption circular tube is located inside the straight-grooved tube energy absorption member, the top end of the energy absorption circular tube is fixedly connected to the lower surface of the circular top plate, the energy absorption circular tube and the straight-grooved tube energy absorption member are coaxially distributed, and the axial length of the energy absorption circular tube is less than the axial length of the straight-grooved tube energy absorption member.

[0009] A flower-shaped support plate is arranged in the circumferential space between the energy absorption circular tube and the straight-grooved tube energy absorption member. The outer contour shape and size of the flower-shaped support plate are the same as the inner surface contour shape and size of the straight-grooved tube energy absorption member, and the diameter of the central hole of the flower-shaped support plate is equal to the diameter of the energy absorption circular tube; the number of the flower-shaped support plates is several, and several flower-shaped support plates are axially spaced apart.

[0010] An energy absorption circular tube limit groove is arranged at the center of the upper surface of the small-diameter end of the conical turning table, a threaded hole is arranged at the center of the energy absorption circular tube limit groove, and a lifting lug bolt is installed in the threaded hole; a circular through hole is arranged at the center of the circular top plate.

[0011] A straight-grooved tube turning stop edge is arranged circumferentially at the large-diameter end of the conical turning table, and a first circular chamfer is arranged at the junction of the upper surface of the straight-grooved tube turning stop edge and the side conical surface of the conical turning table.

[0012] A second circular chamfer is arranged at the junction of the annular bottom surface and the inner side elevation at the lower pipe orifice of the straight-grooved tube energy absorption member.

[0013] The cross-sectional shape of the straight corrugated tube energy absorption member is flower-shaped, including petal convex ribs and petal concave ribs, and the petal convex ribs and petal concave ribs are evenly and alternately distributed along the circumferential direction.

[0014] The number of petal convex ribs and petal concave ribs of the straight corrugated tube energy absorption member is equal and both are denoted as m, then the total number of petal convex ribs and petal concave ribs is denoted as 2m, and the included angle between adjacent petal convex ribs and petal concave ribs is denoted as γ, and it is required to satisfy γ = π / m.

[0015] The cross-sectional shapes of the petal convex ribs and petal concave ribs are both circular arcs, the inner circular arc of the petal convex rib is tangent to the outer circular arc of the petal concave rib, and the outer circular arc of the petal convex rib is tangent to the inner circular arc of the petal concave rib.

[0016] Denote the center point of the straight corrugated tube energy absorption member as O 1 , denote the cross-sectional center point of the petal convex rib as O 2 , denote the cross-sectional center point of the petal concave rib as O 3 , denote the connection distance between the center point O 1 and the center point O 2 as R 1 , denote the inner circular arc radius of the petal convex rib as R 2 , denote the inscribed circle radius of the petal concave rib as R 3 , denote the connection distance between the center point O 1 and the center point O 3 as R 4 , denote the circumscribed circle radius of the petal convex rib as R 5 , set the wall thickness of the straight corrugated tube energy absorption member as t, denote the semi-included angle of the inner circular arc of the petal convex rib as θ, denote the arc length of the middle line of the petal convex rib as L t , denote the arc length of the middle line of the petal concave rib as L a , denote the total length of the corrugation middle line of the straight corrugated tube energy absorption member as L z , then it is required to satisfy the following relationship:

[0017] R 4 = R 2 + R 3 ;

[0018] (2R 2 ) 2 = R 4 2 + R 1 2 - 2cos(γ)·R 4 ·R 1 ;

[0019]

[0020] 0﹤t﹤R2 ;

[0021] R 5 = R 1 + R 2 + t;

[0022]

[0023] L z = m(L t + L a ) = 4θR 2 m - 2πR 2 + πt.

[0024] The processing method of the ruled tube energy absorption member includes the following steps:

[0025] Step 1: Manufacture the processing equipment. The processing equipment includes a reaction frame, a core mold, a pressure head and a hydraulic cylinder; the reaction frame adopts an annular structure, the hydraulic cylinders are uniformly arranged on the reaction frame along the circumferential direction, the end of the piston rod of each hydraulic cylinder is fixedly installed with a pressure head, the core mold is fixedly arranged at the center inside the reaction frame, and the central axes of all hydraulic cylinders intersect at the center of the core mold;

[0026] Step 2: Manufacture the blank of the ruled tube energy absorption member. First, cut a rectangular plate. The thickness of the rectangular plate is selected according to the wall thickness t of the ruled tube energy absorption member, and the length dimension of the rectangular plate is cut according to the total length L of the corrugation center line of the ruled tube energy absorption member z , and then send the cut rectangular plate into a rolling machine for rolling until a cylindrical blank is formed, and then weld and fix the joint of the cylindrical blank.

[0027] Step 3: Set the cylindrical blank on the outside of the core mold, and then synchronously start all the hydraulic cylinders in the circumferential direction. Under the pressing force applied by the hydraulic cylinders, the pressure heads in the circumferential direction synchronously approach the core mold until the cross-sectional shape of the cylindrical blank becomes a flower shape;

[0028] Step 4: Take out the manufactured ruled tube energy absorption member from the processing equipment, and then grind the boundary of the ruled tube energy absorption member blank, and at the same time complete the grinding of the second circular chamfer at the junction of the annular bottom surface and the inner vertical surface at the lower end pipe orifice of the ruled tube energy absorption member.

[0029] The beneficial effects of the present invention:

[0030] The corrugated annular cross-section barrel outer-turning energy absorption device of the present invention adopts an innovatively designed straight-grooved tube energy absorption component. Compared with the traditional pre-folded energy absorption component, through the expansion and flipping of the straight-grooved tube energy absorption component for deformation energy absorption, the interference of boundary constraints is avoided, and the flexural rigidity of the energy absorption component is greatly improved. Through the combined action of the self-compression deformation energy absorption of the energy absorption circular tube and the flipping energy absorption of the straight-grooved tube energy absorption component, the regulation of the deformation resistance is realized. Under axial impact compression, it can effectively avoid abnormal deformation such as expansion buckling and stacking instability of the energy absorption component, and reliably ensure that the actual energy absorption effect of the energy absorption component meets the design goal. Description of the Drawings

[0031] Figure 1 It is a structural schematic diagram (axial side view) of a corrugated annular cross-section barrel outer-turning energy absorption device of the present invention;

[0032] Figure 2 It is a structural schematic diagram (front cross-sectional view) of a corrugated annular cross-section barrel outer-turning energy absorption device of the present invention;

[0033] Figure 3 It is a structural schematic diagram (axial side view) of the flower-shaped support plate of the present invention;

[0034] Figure 4 It is a schematic diagram of the dimensional parameters of the straight-grooved tube energy absorption component of the present invention (top view);

[0035] Figure 5 It is a schematic diagram of the processing equipment for pressing the straight-grooved tube energy absorption component (top view);

[0036] Figure 6 It is an effect diagram of the simulation test of a corrugated annular cross-section barrel outer-turning energy absorption device of the present invention;

[0037] Figure 7 It is a relationship diagram of the reaction force and energy absorption of the straight-grooved tube energy absorption component of the present invention with the impact displacement during the test;

[0038] In the figure, 1 - conical flipping table, 2 - straight-grooved tube energy absorption component, 3 - circular top plate, 4 - threaded hole, 5 - straight-grooved tube flipping edge, 6 - first round chamfer, 7 - second round chamfer, 8 - circular through hole, 9 - petal convex rib, 10 - petal concave rib, 11 - reaction force frame, 12 - core mold, 13 - pressing head, 14 - hydraulic cylinder, 15 - energy absorption circular tube, 16 - flower-shaped support plate, 17 - energy absorption circular tube limiting groove, 18 - lifting lug bolt. Detailed Embodiment

[0039] The following further elaborates on the present invention in detail in conjunction with the drawings and specific embodiments.

[0040] As Figures 1 to 4As shown in the figure, a corrugated annular cross-section barrel external turning energy absorption device includes a conical turning table 1, a straight-grooved tube energy absorption member 2, a circular top plate 3, and an energy absorption circular tube 15. The straight-grooved tube energy absorption member 2 is vertically arranged. The circular top plate 3 is horizontally and fixedly arranged at the top of the straight-grooved tube energy absorption member 2, and the circular top plate 3 and the straight-grooved tube energy absorption member 2 are coaxially distributed. The conical turning table 1 is located directly below the straight-grooved tube energy absorption member 2. The small-diameter end of the conical turning table 1 is inserted upward into the lower pipe orifice of the straight-grooved tube energy absorption member 2, and the conical turning table 1 and the straight-grooved tube energy absorption member 2 are coaxially distributed. The energy absorption circular tube 15 is located inside the straight-grooved tube energy absorption member 2. The top end of the energy absorption circular tube 15 is fixedly connected to the lower surface of the circular top plate 3. The energy absorption circular tube 15 and the straight-grooved tube energy absorption member 2 are coaxially distributed, and the axial length of the energy absorption circular tube 15 is less than the axial length of the straight-grooved tube energy absorption member 2. The regulation of the deformation resistance is achieved through the combined action of the self-compression deformation energy absorption of the energy absorption circular tube 15 and the turning energy absorption of the straight-grooved tube energy absorption member 2.

[0041] A flower-shaped support plate 16 is arranged in the circumferential space between the energy absorption circular tube 15 and the straight-grooved tube energy absorption member 2. The outer contour shape and size of the flower-shaped support plate 16 are the same as the inner surface contour shape and size of the straight-grooved tube energy absorption member 2. The diameter of the central hole of the flower-shaped support plate 16 is equal to the diameter of the energy absorption circular tube 15. The number of the flower-shaped support plates 16 is several, and several flower-shaped support plates 16 are axially spaced apart.

[0042] An energy absorption circular tube limiting groove 17 is arranged at the center of the upper surface of the small-diameter end of the conical turning table 1. A threaded hole 4 is arranged at the center of the energy absorption circular tube limiting groove 17, and a lifting lug bolt 18 is installed in the threaded hole 4 to facilitate the handling and disassembly of the conical turning table 1. A circular through hole 8 is opened at the center of the circular top plate 3 to facilitate the pre-installation and post-disassembly of the circular top plate 3.

[0043] A straight-grooved tube turning stop edge 5 is circumferentially arranged at the large-diameter end of the conical turning table 1. A first circular chamfer 6 is arranged at the connection between the upper surface of the straight-grooved tube turning stop edge 5 and the side conical surface of the conical turning table 1 to facilitate the smooth turning of the straight-grooved tube energy absorption member 2.

[0044] A second circular chamfer 7 is arranged at the connection between the annular bottom surface and the inner vertical surface at the lower pipe orifice of the straight-grooved tube energy absorption member 2 to facilitate the smooth turning of the straight-grooved tube energy absorption member 2.

[0045] The cross-sectional shape of the straight-grooved tube energy absorption member 2 is flower-shaped, including petal convex ribs 9 and petal concave ribs 10. The petal convex ribs 9 and the petal concave ribs 10 are evenly and alternately distributed along the circumferential direction.

[0046] If the number of petal-shaped convex ribs 9 and petal-shaped concave ribs 10 of the straight corrugated tube energy absorption member 2 is equal and both are denoted as m, then the total number of petal-shaped convex ribs 9 and petal-shaped concave ribs 10 is denoted as 2m. Denote the angle between adjacent petal-shaped convex ribs 9 and petal-shaped concave ribs 10 as γ, and it is required to satisfy γ = π / m.

[0047] The cross-sectional shapes of the petal-shaped convex ribs 9 and the petal-shaped concave ribs 10 are both circular arcs. The inner circular arc of the petal-shaped convex rib 9 is tangent to the outer circular arc of the petal-shaped concave rib 10, and the outer circular arc of the petal-shaped convex rib 9 is tangent to the inner circular arc of the petal-shaped concave rib 10.

[0048] Denote the center point of the straight corrugated tube energy absorption member 2 as O 1 , denote the cross-sectional center point of the petal-shaped convex rib 9 as O 2 , denote the cross-sectional center point of the petal-shaped concave rib 10 as O 3 , denote the center point O 1 and the connection distance with the center point O 2 as R 1 , denote the inner circular arc radius of the petal-shaped convex rib 9 as R 2 , denote the inscribed circle radius of the petal-shaped concave rib 10 as R 3 , denote the center point O 1 and the connection distance with the center point O 3 as R 4 , denote the circumscribed circle radius of the petal-shaped convex rib 9 as R 5 , set the wall thickness of the straight corrugated tube energy absorption member 2 as t, denote the half central angle of the inner circular arc of the petal-shaped convex rib 9 as θ, and denote the central line arc length of the petal-shaped convex rib 9 as L t , denote the central line arc length of the petal-shaped concave rib 10 as L a , denote the total central line corrugation length of the straight corrugated tube energy absorption member 2 as L z , then it is required to satisfy the following relationship:

[0049] R 4 = R 2 + R 3 ;

[0050] (2R 2 ) 2 = R 4 2 + R 1 2 - 2cos(γ)·R 4 ·R 1 ;

[0051]

[0052] 0﹤t﹤R 2 ;

[0053] R 5 = R1 +R 2 +t;

[0054]

[0055]

[0056] L z =m(L t +L a )=4θR 2 m-2πR 2 +πt.

[0057] Therefore, when the number m of the petal convex ribs 9 and the petal concave ribs 10 of the straight corrugated tube type energy absorbing member 2 and the center point O 1 With the center point O 2 The connection distance R 1 , the inner arc radius R of the petal rib 9 2 When the wall thickness t of the straight corrugated tube type energy absorbing member 2 is uniquely determined, the cross-sectional shape of the straight corrugated tube type energy absorbing member 2 can be uniquely determined.

[0058] The processing method of the straight corrugated tube type energy absorbing member 2 comprises the following steps:

[0059] Step 1: Make processing equipment, such as Figure 5 As shown, the processing equipment includes a reaction frame 11, a core mold 12, a pressure head 13 and a hydraulic cylinder 14; the reaction frame 11 adopts an annular structure, the hydraulic cylinders 14 are evenly arranged on the reaction frame 11 along the circumferential direction, the piston rod end of each hydraulic cylinder 14 is fixedly installed with a pressure head 13, the core mold 12 is fixedly set at the inner center of the reaction frame 11, and the central axes of all hydraulic cylinders 14 intersect at the center of the core mold 12; in this embodiment, the number of hydraulic cylinders 14 is six, the maximum pressing force of all hydraulic cylinders 14 is 500kN, the number of pressure heads 13 is six, and the cross-sectional shape of the core mold 12 is a six-petal flower shape;

[0060] Step 2: Make the blank of the straight corrugated tube type energy absorbing component 2. First, cut a rectangular plate. The thickness of the rectangular plate is selected according to the wall thickness t of the straight corrugated tube type energy absorbing component 2. The length of the rectangular plate is selected according to the total length L of the corrugated center line of the straight corrugated tube type energy absorbing component 2. z Cutting is performed, and then the cut rectangular plate is sent to a rounding machine for rounding treatment until a cylindrical blank is formed, and then the seam of the cylindrical blank is welded and fixed; in this embodiment, the rectangular plate is made of HG785D;

[0061] Step 3: Sheath the cylindrical blank on the outside of the core mold 12, and then synchronously start all the hydraulic cylinders 14 in the circumferential direction. Under the pressing force applied by the hydraulic cylinders 14, the punches 13 in the circumferential direction synchronously approach the core mold 12 until the cross-sectional shape of the cylindrical blank becomes a flower shape; in this embodiment, the cross-sectional shape of the cylindrical blank becomes a six-petal flower shape after pressing.

[0062] Step 4: Take out the made straight-grooved tube energy absorber 2 from the processing equipment, and then grind the boundary of the blank of the straight-grooved tube energy absorber 2. At the same time, complete the grinding of the second circular chamfer 7 at the junction of the annular bottom surface and the inner vertical surface at the lower end pipe orifice of the straight-grooved tube energy absorber 2.

[0063] In this embodiment, the total height of the conical turntable 1 is 80 mm, the diameter of the threaded hole 4 is 16 mm, the depth of the threaded hole 4 is 70 mm, the thickness of the straight-grooved tube turning stop edge 5 is 20 mm, the radius of the first circular chamfer 6 is 13.5 mm, the diameter of the small-diameter end of the conical turntable 1 is 148.18 mm, the diameter of the large-diameter end of the conical turntable 1 is 237.8 mm, and the diameter of the straight-grooved tube turning stop edge 5 is 300 mm; the diameter of the energy-absorbing circular tube limiting groove 17 is 104 mm, the depth of the energy-absorbing circular tube limiting groove 17 is 10 mm, and the vertical groove wall surface of the energy-absorbing circular tube limiting groove 17 has an inclination angle of 5°; the wall thickness of the straight-grooved tube energy absorber 2 is 6 mm, the distance between the center point of the straight-grooved tube energy absorber 2 and the center point of the cross-section of the petal rib 9 is recorded as 80 mm, the axial length of the straight-grooved tube energy absorber 2 is 310 mm, the inner arc radius of the petal rib 9 is 23 mm, the outer arc radius of the petal concave rib 10 is 15 mm, and the radius of the second circular chamfer 7 is 5 mm; the thickness of the circular top plate 3 is 10 mm, the diameter of the circular top plate 3 is 289 mm, and the diameter of the circular through hole 8 is 50 mm; the outer diameter of the energy-absorbing circular tube 15 is 102 mm, the inner diameter of the energy-absorbing circular tube 15 is 88.5 mm, and the axial length of the energy-absorbing circular tube 15 is 265 mm; the thickness of the flower-shaped support plate 16 is 10 mm, the diameter of the central hole of the flower-shaped support plate 16 is 102 mm, the number of the flower-shaped support plates 16 is two, the distance between the upper flower-shaped support plate 16 and the circular top plate 3 is 100 mm, and the distance between the lower flower-shaped support plate 16 and the circular top plate 3 is 150 mm; the thread diameter of the lifting lug bolt 18 is 16 mm.

[0064] As Figure 6As shown, it can be seen from the figure that the buckling deformation process of the straight-grooved tubular energy-absorbing member 2 is mainly divided into straight-groove expansion, circular tube flaring, film deformation, curling deformation and stable deformation; First, the lower end corrugated shape boundary of the straight-grooved tubular energy-absorbing member 2 first undergoes diameter expansion. When it contacts the upper boundary of the first circular chamfer 6, the lower end corrugated shape boundary of the straight-grooved tubular energy-absorbing member 2 is completely expanded; Subsequently, the lower end pipe orifice of the straight-grooved tubular energy-absorbing member 2 contacts the first circular chamfer 6 and continuously undergoes plastic flaring as the diameter of the first circular chamfer 6 increases. During this process, the reaction force slightly rises; When the lower end pipe orifice of the straight-grooved tubular energy-absorbing member 2 contacts the lower boundary of the first circular chamfer 6, due to the limitation of the boundary, the reaction force will rise to the highest point. At this time, the lower end pipe orifice of the straight-grooved tubular energy-absorbing member 2 begins to contact the upper surface of the straight-grooved pipe turning stop edge 5. At this time, the lower end pipe orifice of the straight-grooved tubular energy-absorbing member 2 is subjected to the extrusion stress of the axial load, the extrusion stress of the turning table, and the circumferential tensile stress of flaring; Under the action of the axial compressive load, the lower end pipe orifice of the straight-grooved tubular energy-absorbing member 2 continues to deform along the first circular chamfer 6. Since the deformation is free, when the lower end pipe orifice of the straight-grooved tubular energy-absorbing member 2 breaks away from the first circular chamfer 6, under the action of the circumferential tensile stress, the lower end pipe orifice of the straight-grooved tubular energy-absorbing member 2 begins to curl upwards. When the curling angle reaches a certain value, the reverse bending moment will be equal to the plastic bending moment, and at this time, the curling deformation stops; As the turning pipe deformation continues, the lower end pipe orifice of the straight-grooved tubular energy-absorbing member 2 generates reverse curling and straightening deformation, thereby forming a double-layer pipe wall, and then a stable outward turning deformation can be obtained.

[0065] As Figure 7 shown, it can be seen from the figure that during the process of simulating rock burst, the energy absorption of the straight-grooved tubular energy-absorbing member 2 during deformation increases with the increase of the impact displacement. Before the lower end pipe orifice of the straight-grooved tubular energy-absorbing member 2 contacts the lower boundary of the first circular chamfer 6, the lower end pipe orifice of the straight-grooved tubular energy-absorbing member 2 is in the straight-groove expansion and circular tube flaring stages, and the reaction force value is small, and the change in energy absorption is also small; When the lower end pipe orifice of the straight-grooved tubular energy-absorbing member 2 contacts the lower boundary of the first circular chamfer 6, due to the limitation of the boundary, the reaction force reaches the peak point, and then it is in the film deformation, bending deformation and stable deformation stages, and the energy absorption rapidly increases and increases linearly. Specifically, the energy absorption obtained in the simulation test is 21.82 kJ, while the maximum energy absorption obtained in the actual test is 19.41 kJ, and the two are basically the same.

[0066] The solutions in the embodiments are not intended to limit the protection scope of the present invention. Any equivalent implementation or modification without departing from the present invention is included in the protection scope of the present invention.

Claims

1. A corrugated annular cross-section cylinder eversion energy absorption device, characterized in that: It includes a conical turning platform, a straight corrugated tube type energy absorbing component, a circular top plate and an energy absorbing circular tube; the straight corrugated tube type energy absorbing component is vertically arranged; the circular top plate is horizontally fixedly arranged on the top of the straight corrugated tube type energy absorbing component, and the circular top plate and the straight corrugated tube type energy absorbing component are coaxially distributed; the conical turning platform is located directly below the straight corrugated tube type energy absorbing component, the small diameter end of the conical turning platform is upwardly inserted into the lower end pipe opening of the straight corrugated tube type energy absorbing component, and the conical turning platform and the straight corrugated tube type energy absorbing component are coaxially distributed; the energy absorbing circular tube is located inside the straight corrugated tube type energy absorbing component, the top end of the energy absorbing circular tube is fixedly connected to the lower surface of the circular top plate, the energy absorbing circular tube and the straight corrugated tube type energy absorbing component are coaxially distributed, and the axial length of the energy absorbing circular tube is less than the axial length of the straight corrugated tube type energy absorbing component.

2. The corrugated annular cross-section cylinder eversion energy absorption device according to claim 1, characterized in that: A flower-shaped support plate is arranged in the annular space between the energy-absorbing circular tube and the straight-corrugated tube-type energy-absorbing component. The outer contour shape and size of the flower-shaped support plate are the same as the inner surface contour shape and size of the straight-corrugated tube-type energy-absorbing component. The diameter of the center hole of the flower-shaped support plate is equal to the diameter of the energy-absorbing circular tube. There are a plurality of flower-shaped support plates, and the plurality of flower-shaped support plates are distributed at intervals along the axial direction.

3. The corrugated annular cross-section cylinder eversion energy absorption device according to claim 1, characterized in that: An energy absorbing circular tube limiting groove is arranged at the center of the upper surface of the small diameter end of the conical turning table, a threaded hole is arranged at the center of the energy absorbing circular tube limiting groove, and a hanging ear bolt is installed in the threaded hole; a circular through hole is opened at the center of the circular top plate.

4. The corrugated annular cross-section cylinder eversion energy absorption device according to claim 1, characterized in that: A straight corrugated tube turning stop edge is circumferentially arranged at the large diameter end of the conical turning platform, and a first round chamfer is arranged at the junction of the upper surface of the straight corrugated tube turning stop edge and the side conical surface of the conical turning platform.

5. The corrugated annular cross-section cylinder eversion energy absorption device according to claim 1, characterized in that: A second round chamfer is provided at the junction of the annular bottom surface and the inner side vertical surface at the lower end pipe opening of the straight corrugated tube type energy absorbing component.

6. The corrugated annular cross-section cylinder eversion energy absorption device according to claim 4, characterized in that: The cross-sectional shape of the straight corrugated tube type energy absorbing component is a flower shape, including petal convex ribs and petal concave ribs, and the petal convex ribs and petal concave ribs are evenly and alternately distributed along the circumferential direction.

7. The corrugated annular cross-section cylinder eversion energy absorption device according to claim 6, characterized in that: The number of petal convex ribs and petal concave ribs of the straight corrugated tube type energy absorbing component is equal and both are denoted as m, then the total number of petal convex ribs and petal concave ribs is denoted as 2m, and the angle between adjacent petal convex ribs and petal concave ribs is denoted as γ, then it is required to satisfy γ=π / m.

8. The corrugated annular cross-section cylinder eversion energy absorption device according to claim 7, characterized in that: The cross-sectional shapes of the petal convex rib and the petal concave rib are both arc-shaped, the inner arc of the petal convex rib is tangent to the outer arc of the petal concave rib, and the outer arc of the petal convex rib is tangent to the inner arc of the petal concave rib.

9. The corrugated annular cross-section cylinder eversion energy absorption device according to claim 8, characterized in that: The center point of the straight corrugated tube energy absorbing component is recorded as O1, the center point of the cross section of the petal convex rib is recorded as O2, the center point of the cross section of the petal concave rib is recorded as O3, the distance between the center point O1 and the center point O2 is recorded as R1, the inner arc radius of the petal convex rib is recorded as R2, the inscribed circle radius of the petal concave rib is recorded as R3, the distance between the center point O1 and the center point O3 is recorded as R4, the circumscribed circle radius of the petal convex rib is recorded as R5, the wall thickness of the straight corrugated tube energy absorbing component is set to t, the inner arc semi-wrapped angle of the petal convex rib is recorded as θ, and the midline arc length of the petal convex rib is recorded as L t , the length of the midline arc of the petal concave rib is recorded as L a , the total length of the corrugation centerline of the straight corrugated tube energy absorbing component is recorded as L z , then the following relationship is required to be satisfied: R4=R2+R3; (2R2) 2 =R4 2 +R1 2 -2cos(γ)·R4·R1; 0﹤t﹤R2; R5=R1+R2+t; L z =m(L t +L a )=4θR2m-2πR2+πt.

10. The corrugated annular cross-section cylinder eversion energy absorption device according to claim 9, characterized in that: The processing method of the straight corrugated tube type energy absorbing component comprises the following steps: Step 1: Make processing equipment, which includes a reaction frame, a core mold, a pressure head and a hydraulic cylinder; the reaction frame adopts a ring structure, and the hydraulic cylinders are evenly arranged on the reaction frame along the circumferential direction. The end of the piston rod of each hydraulic cylinder is fixedly installed with a pressure head, and the core mold is fixedly set at the inner center of the reaction frame, and the central axes of all hydraulic cylinders intersect at the center of the core mold; Step 2: Make the blank of the straight corrugated tube energy absorbing component. First, cut a rectangular plate. The thickness of the rectangular plate is selected according to the wall thickness t of the straight corrugated tube energy absorbing component. The length of the rectangular plate is selected according to the total length L of the corrugated center line of the straight corrugated tube energy absorbing component. z Cutting is performed, and then the cut rectangular plates are sent to a rounding machine for rounding treatment until a cylindrical blank is formed, and then the seams of the cylindrical blank are welded and fixed; Step 3: Put the cylindrical blank on the outside of the core mold, and then start all the hydraulic cylinders in the circumferential direction synchronously. Under the pressing force applied by the hydraulic cylinders, the pressure heads in the circumferential direction are synchronously moved toward the core mold until the cross-sectional shape of the cylindrical blank becomes a flower shape; Step 4: Take out the manufactured straight corrugated tube energy absorbing component from the processing equipment, then grind the edge of the straight corrugated tube energy absorbing component blank, and complete the grinding of the second round chamfer at the junction of the annular bottom surface at the lower end of the straight corrugated tube energy absorbing component and the inner vertical surface.

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