CN110307020B - Mining constant-resistance support hydraulic prop - Google Patents
Mining constant-resistance support hydraulic prop Download PDFInfo
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- CN110307020B CN110307020B CN201910642465.XA CN201910642465A CN110307020B CN 110307020 B CN110307020 B CN 110307020B CN 201910642465 A CN201910642465 A CN 201910642465A CN 110307020 B CN110307020 B CN 110307020B
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- 238000005065 mining Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 35
- 239000010959 steel Substances 0.000 claims abstract description 35
- 230000008093 supporting effect Effects 0.000 claims abstract description 27
- 238000007906 compression Methods 0.000 claims description 17
- 230000007704 transition Effects 0.000 claims description 17
- 230000006835 compression Effects 0.000 claims description 14
- 239000011435 rock Substances 0.000 abstract description 10
- 239000006096 absorbing agent Substances 0.000 description 14
- 238000010521 absorption reaction Methods 0.000 description 14
- 238000005452 bending Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 238000004364 calculation method Methods 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 5
- 238000012669 compression test Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010219 correlation analysis Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
- E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/50—Component parts or details of props
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Vibration Dampers (AREA)
Abstract
The invention discloses a mining constant-resistance support hydraulic prop which comprises an upper upright post and a hollow bottom post, wherein the upper upright post is arranged in the bottom post, an energy absorbing device is further arranged in a cavity in the bottom post, the end part of the upper upright post is propped against the upper end of the energy absorbing device, the energy absorbing device is of a multi-surface shell structure formed by steel plate in a surrounding connection mode, the upper end face and the lower end face of the energy absorbing device are of polygonal structures, a closed crease line is arranged on the shell and comprises an inner concave crease line and an outer convex crease line, an upper concave surface and a lower concave surface are respectively arranged at the upper side and the lower side of the inner concave crease line on the shell, an upper outer convex surface and a lower outer convex surface are respectively arranged at the upper side and the lower side of the outer convex crease line on the shell, and a pressure bearing support structure is arranged at the outer side of the outer convex crease line or an inner convex pressure bearing support structure is arranged at the inner side of the outer convex crease line. The pressure-bearing supporting structure and the outer convex surface connected with the pressure-bearing supporting structure form mutual restriction, so that impact energy is fully absorbed, and the problem that an upper upright post is broken when rock burst occurs in a roadway support is solved.
Description
Technical Field
The invention belongs to the technical field of mining safety, and particularly relates to a mining constant-resistance support hydraulic prop.
Background
Rock burst is a serious geological disaster of coal mines, can cause serious damage and casualties to underground roadways and working surfaces, and has become a worldwide difficult problem in the fields of rock underground engineering and rock mechanics. In the exploitation process, active preventive measures and powerful supporting measures are adopted to ensure the safety of working operation.
At present, the mine exploitation and the support field adopt a hydraulic support to support, however, due to the characteristics of short time, high strength and large energy release of rock burst, the traditional hydraulic support safety protection is usually not enough to yield and unload, so that the problems of damage to the support, column breakage and support structure failure occur, the support structure cannot play an effective supporting role, and the operation safety cannot be ensured.
The Chinese patent document CN 202531197U discloses a hydraulic prop for a hydraulic support system, which comprises a hydraulic single prop, an energy-absorbing transition section, an energy-absorbing anti-impact abdicating component and a movable prop bottom, wherein the energy-absorbing anti-impact abdicating component is arranged in the movable prop bottom, one end of the energy-absorbing transition section is sleeved in one end of the movable prop bottom, and the other end of the energy-absorbing transition section is embedded in the hydraulic single prop. The structure of the energy-absorbing impact-preventing abdication component is shown in figure 1.
The extrusion deformation process of the whole energy-absorbing anti-impact yielding component is shown in fig. 2, and the relation curve between displacement and axial bearing force formed in the extrusion deformation process is shown in fig. 3.
and a stage: the whole component is basically free from deformation, and the bearing capacity is increased linearly;
b, stage: the upper concave surface 32 of the whole member begins to shrink inwards, the bearing capacity is rapidly reduced, the compression displacement is rapidly increased, the upper convex surface 34 is gradually bent and folded, the bearing capacity is temporarily reduced, and the bearing capacity is in a bending and folding resistant state;
and c, stage: the outer convex crease line 312 expands slightly outwards, the upper outer convex surface 34 starts to bend, the upper inner concave surface 32 is axially folded, and the bearing capacity is improved; at the end, radial expansion is maximized;
and d, stage: the lower concave surface 33 and the lower convex surface 35 are consistent with the upper convex surface 34 and the upper concave surface 32, after mutual extrusion to a certain extent, the bearing capacity begins to be reduced, and finally, the bearing capacity is completely flattened;
stage e: the lower part repeats stage c again, with the lower concave surface 33 and the lower convex surface 35 being folded.
The whole anti-collision yielding member has larger axial bearing force fluctuation in the gradual extrusion deformation process, is unfavorable for protecting the hydraulic support, and has the problem of failure easily in the whole hydraulic support.
Disclosure of Invention
Aiming at the problems that the load drops faster and is not easy to keep after the rock burst exceeds the limit load of the existing mining energy absorber, the hydraulic prop can be protected, and basically constant axial supporting force can be provided for the hydraulic prop in the compression deformation process of the energy absorber, so that the hydraulic prop is protected to the greatest extent; therefore, the invention provides a mining constant-resistance support hydraulic prop.
The technical scheme adopted is as follows:
the utility model provides a mining constant resistance support hydraulic prop, includes upper column and a cavity sill pillar, the upper column set up in the sill pillar, and with the medial surface of sill pillar sliding connection still is equipped with energy-absorbing device in the cavity in the sill pillar, the tip of upper column with energy-absorbing device's upper end forms the contact that offsets, energy-absorbing device is the multiaspect shell structure that the steel sheet encloses to connect and forms, the up end and the lower terminal surface of casing are polygonal structure, be equipped with the closed fold line that at least one head and the tail connected formed on the casing, closed fold line includes indent fold line and evagination fold line, indent fold line and evagination fold line are in be the alternate set up on the closed fold line, both sides position is equipped with respectively with the interior concave surface and the interior concave surface that are the contained angle setting that are connected with it down on the indent fold line on the casing, both sides position is equipped with respectively with the outer convex surface and the lower convex surface that is the contained angle setting with it on the shell, the outside that is equipped with the evagination fold line is equipped with the pressure-bearing surface and evagination support structure simultaneously with the evagination fold line is towards the medial surface.
The lower end of the upper upright post is provided with an energy-absorbing transition section, the energy-absorbing transition section is in sliding fit with the inner side surface of the bottom post, the length of the superposition part of the energy-absorbing transition section and the bottom post is not less than 1/8 of the height of the energy-absorbing device, and the energy-absorbing transition section is propped against the upper end of the energy-absorbing device.
The outer convex bearing support structures are upper bearing support structures arranged along the axial bearing force direction of each upper outer convex surface, a plurality of upper bearing support structures are arranged at intervals in the direction perpendicular to the axial bearing force, the upper bearing support structures enable the wall thickness of the upper outer convex surfaces in the direction perpendicular to the axial bearing force to be arranged in a non-uniform thickness mode, and the maximum axial bearing force born by the upper bearing support structures in compression deformation is kept in a nearly constant state.
The outer convex pressure-bearing support structure further comprises a plurality of lower pressure-bearing support structures arranged along the outer side face of each lower outer convex surface, and the lower pressure-bearing support structures and the corresponding upper pressure-bearing support structures are arranged in a split mode.
The lower bearing support structure on the lower outer convex surface is arranged in the extending direction of the upper bearing support structure on the upper outer convex surface corresponding to the lower bearing support structure.
Each upper outer convex surface is provided with two upper bearing support structures, each lower outer convex surface is provided with two lower bearing support structures, and the upper bearing support structures and the lower bearing support structures are arranged close to two ends of the outer convex crease line.
The inner convex pressure-bearing support structure is a steel plate structure with a pre-folding line, and comprises an upper inner convex surface and a lower inner convex surface which are connected with each other in an included angle, each group of the upper outer convex surface and the lower outer convex surface of the shell is respectively provided with an inner convex pressure-bearing support structure extending towards the middle of the shell, and two ends of the inner convex pressure-bearing support structure are respectively fixedly connected with the inner side surface of the upper outer convex surface and the inner side surface of the lower outer convex surface.
The included angle alpha formed between the upper inner convex surface and the lower inner convex surface is smaller than or equal to the included angle beta formed between the upper outer convex surface and the lower outer convex surface, and the pre-folding lines of the inner convex pressure-bearing support structure and the outer folding lines are positioned on the same horizontal plane.
The end of the upper inner convex surface is flush with the end of the upper outer convex surface, the end of the lower inner convex surface is flush with the end of the lower outer convex surface, and an included angle alpha formed between the upper inner convex surface and the lower inner convex surface is equal to an included angle beta formed between the upper outer convex surface and the lower outer convex surface.
Two ends of two adjacent inward convex pressure-bearing support structures are fixedly connected through connecting steel plates.
The inward convex pressure bearing support structure or the outward convex pressure bearing support structure is a steel rod or steel bar structure which is arranged in an included angle.
The technical scheme of the invention has the following advantages:
A. the invention is provided with an energy absorption device which is in contact with an upper upright post in a bottom post, wherein the inner side surface of each group of upper outer convex surface and lower outer convex surface in the energy absorption device is respectively provided with an inner convex pressure bearing support structure, or the outer side of an outer convex crease line is provided with an outer convex pressure bearing support structure; when the pressure bearing deformation is carried out, the inward convex pressure bearing supporting structure or the outward convex pressure bearing supporting structure can be rapidly deformed to give way, the arranged pressure bearing supporting structure and the outward convex surface connected with the pressure bearing supporting structure form mutual restriction in the whole deformation and supporting process, and the impact energy is fully absorbed, so that the hydraulic prop is protected, the upper upright is not damaged or invalid, and the problem that the upper upright is broken when the rock burst of the roadway support occurs is solved.
B. The energy absorption device can meet the performance requirements of ultimate bearing capacity, deformation energy absorption and the like of the hydraulic prop, particularly, in the aspect of providing counter force, can ensure that the supporting force is basically kept constant after the hydraulic prop reaches the ultimate bearing capacity, and does not fall suddenly, thereby protecting the hydraulic prop to the maximum extent on the premise of ensuring the initial supporting force and ensuring that the whole supporting structure is not invalid.
C. When the invention is applied to the hydraulic prop, when the rock burst is pressed, the whole shell of the energy absorbing device generates plastic bending and radial expansion to absorb energy, and the supporting force provided by the energy absorbing device in the compression process is kept stable or gradually increased, so that the possibility of secondary impact is reduced. The shell has reasonable travel when compressing, ensures that certain abdication process exists, and the flattened structure is stable in the bottom column, so that the hydraulic prop can not be transversely extruded, and the original supporting effect of the hydraulic prop is not damaged.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings that are required for the embodiments will be briefly described, and it will be apparent that the drawings in the following description are some embodiments of the present invention and that other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a hydraulic prop provided by the present invention;
FIG. 2 is a perspective view of a prior art energy absorber device provided by the present invention;
FIG. 3 is a diagram illustrating the press deformation process performed on the structure of FIG. 2;
FIG. 4 is a schematic diagram of the load-bearing force curve shown in FIG. 2;
FIG. 5 is a schematic perspective view of an energy absorber device provided by the present invention;
FIG. 6 is a top view of the structure shown in FIG. 5;
FIG. 7 is a cross-sectional view of the structure A-A of FIG. 6;
FIG. 8 is a graph of the model load bearing capacity of the energy absorber device of FIG. 5;
FIG. 9 is an energy absorber device with a raised pressure bearing support structure provided by the present invention;
FIG. 10 is an energy absorber device having an upper pressure bearing support structure and a lower pressure bearing support structure provided by the present invention;
FIG. 11 is a graph of the model load bearing capacity of the energy absorber device of FIG. 10.
Reference numerals illustrate:
1-an upper upright post; 2-bottom post
3-energy absorber
31-closed crease line
311-concave crease lines and 312-convex crease lines
32-upper concave surface; 33-a lower concave surface; 34-upper convex surface; 35-lower outer convex surface
36-evagination pressure-bearing supporting structure
361-upper bearing support structure and 362-lower bearing support structure
37-inward convex pressure-bearing supporting structure
371-upper inner convex surface, 372-lower inner convex surface
38-connecting steel plates; 39-closing the support rib.
4-energy-absorbing transition section.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
1. As shown in fig. 1, the invention provides a mining constant-resistance support hydraulic prop, which comprises an upper upright column 1 and a hollow bottom column 2, wherein the upper upright column 1 is arranged in the bottom column 2 and is in sliding connection with the inner side surface of the bottom column 2, an energy absorbing device 3 is further arranged in a cavity in the bottom column 2, the end part of the upper upright column 1 is in abutting contact with the upper end of the energy absorbing device 3, the energy absorbing device 3 is a multi-surface shell structure formed by encircling steel plates, the upper end surface and the lower end surface of the shell are of polygonal structures, at least one closed fold line 31 formed by connecting the front and the rear is arranged on the shell, the closed fold line 31 comprises an inner concave fold line 311 and an outer convex fold line 312, the inner concave fold line 311 and the outer convex fold line 312 are alternately arranged on the closed fold line 31, an upper concave surface 32 and a lower concave surface 33 which are connected with the inner concave fold line and are arranged in an included angle, an upper side 34 and a lower convex fold line 35 which are connected with the upper side and the lower side surface are respectively arranged on the upper side and the lower side of the shell, the inner concave fold line 311 and the outer concave fold line is provided with an included angle formed by the upper side surface 34 and the lower side 35, the outer side surface is arranged on the outer side surface of the shell and the outer side surface which is connected with the outer side surface of the outer concave fold line 35 or the outer side surface which is provided with the outer concave fold line 35 and the outer side surface of the outer support structure and the outer side surface is provided with the outer concave fold line 35 and the inner side surface which is arranged on the inner side surface of the inner concave support layer 35 and the inner side surface is 35 and the outer side surface is 9 and the support layer is shown and 9 and 35. Further, a section of energy-absorbing transition section 4 is arranged at the lower end of the upper upright post 1, the energy-absorbing transition section 4 is in sliding fit with the inner side surface of the bottom post 2, the length of the overlapping part of the energy-absorbing transition section 4 and the bottom post 2 is not less than 1/8 of the height of the energy-absorbing device 3, and the energy-absorbing transition section 4 is in butt joint with the upper end of the energy-absorbing device 3. When the energy absorbing device is gradually flattened, the energy absorbing transition section 4 gradually slides downwards along the inner side surface of the bottom pillar 2.
As shown in fig. 9, the outer convex pressure-bearing support structure 36 of the present invention may be an upper pressure-bearing support structure 361 disposed along the axial bearing force direction on each of the upper outer convex surfaces 34, in which a plurality of upper pressure-bearing support structures 361 are disposed at intervals in the direction perpendicular to the axial bearing force, and the upper pressure-bearing support structures 361 make the wall thickness of the upper outer convex surfaces 34 in the direction perpendicular to the axial bearing force non-uniform, and the maximum axial bearing force that the upper pressure-bearing support structures 361 bear during compression deformation maintain near constant state. The upper bearing support structures 361 are round steel bar structures or rectangular steel bar structures, and can also be steel plate strips formed by cutting steel plates, two upper bearing support structures 361 are arranged at intervals and respectively positioned at two sides of the upper outer convex surface, and three or more upper bearing support structures can be arranged.
As shown in fig. 10, the outer convex bearing support structure 36 further includes a plurality of lower bearing support structures 362 disposed along the outer side surface of each lower outer convex surface 35, and the lower bearing support structures 362 are disposed separately from their corresponding upper bearing support structures 361. The upper and lower bearing support structures shown in fig. 10 are arranged in such a way that the lower bearing support structure 362 on the lower outer convex surface 35 is arranged in the extending direction of the upper bearing support structure 361 on the corresponding upper outer convex surface 34.
Preferably, for the constant resistance performance of the entire energy absorber, two upper bearing support structures 361 are provided on each upper outer convex surface 34, two lower bearing support structures 362 are provided on each lower outer convex surface 35, and the upper bearing support structures 361 and the lower bearing support structures 362 are disposed near both ends of the outer convex crease line 312.
As shown in FIG. 10, the energy absorber device is subjected to stress analysis, and the adopted model has the following dimensions: the thickness of the corrugated steel plate is 8mm, the thickened part with the closed supporting rib is 12mm, the upper end face and the lower end face of the energy absorbing device are square, the side length is 188mm, the shape of the closed corrugated line in the middle is approximate to octagon, the side length is about 90mm, the whole corrugated steel plate is one-step corrugated, and the structural height is 168mm.
The energy absorption device shown in fig. 10 is placed in a bottom pillar to form a hydraulic pillar, and the load-bearing capacity curve of the obtained energy absorption device model is shown in fig. 11 through utilizing a uniaxial compression test and combining finite element calculation. Through calculation, finite element simulation and indoor experiments, reasonable collocation between the material properties and the dimensions of the steel plate is obtained, so that the energy absorption device can absorb larger energy and stably form a preset compression structure when in compression deformation.
With reference to fig. 10 and 11, a specific compression test procedure is as follows:
the shell of the energy absorbing device 3 basically has no deformation, and the bearing capacity basically linearly increases;
b, stage: the upper concave surface 32 of the energy absorber 3 begins to retract inwardly, the compressive displacement increases rapidly, the upper convex surface 34 flexes and folds gradually, and the load carrying capacity decreases briefly, creating a flexing and folding resistance. The bending strength of the upper bearing support structure 361 is high, and the bearing capacity is not obviously reduced;
and c, stage: after the upper outer convex surface 34 is bent to some extent, the local bending strength increases. The entire shell structure finds a location in the whole where the local bending strength is weak, expanding slightly outward from the convex crease line 312. Simultaneously, the upper outer convex surface 34 starts to bend, the upper inner concave surface 32 is axially folded, and the bearing capacity is improved;
and d, stage: the lower concave surface 33 and the lower convex surface 35 are consistent with the upper concave surface 32 and the upper convex surface 34, and after mutual extrusion to a certain extent, the bearing capacity begins to be reduced, and finally, the bearing capacity is completely flattened. In the figure, the steel rod and the steel plate are bent together, so that the bearing capacity is reduced by a small value;
and E, stage: the lower end part repeats the c stage again, the lower concave surface 33 and the lower convex surface 35 are folded, the part which is not completely overlapped in the abcd stage is completely overlapped, a flat stable structure is formed, and the bearing capacity is improved.
As can be seen from fig. 11, the spaced bearing support structures enhance the bending ability of the steel sheet, and the stress is not substantially reduced during bending and folding.
In addition, the present invention also provides an energy absorbing device having an inwardly projecting pressure bearing support structure 37, as shown in FIGS. 5 and 6. The inner convex bearing support structure 37 is a steel plate structure with a pre-bending line, and comprises an upper inner convex surface 371 and a lower inner convex surface 372 which are connected in an included angle, each group of upper outer convex surface 34 and lower outer convex surface 35 of the shell is respectively provided with an inner convex bearing support structure 37 extending towards the middle of the shell, and two ends of the inner convex bearing support structure 37 are fixedly connected with the inner side surface of the upper outer convex surface 34 and the inner side surface of the lower outer convex surface 35 respectively. The inward convex bearing support structure 37 may be a steel rod or bar structure with an included angle, and the inward convex bearing support structure 37 is shown as a steel plate structure formed by bending. The invention sets up the corresponding inner convex bearing support structure 37 on the upper outer convex surface and lower outer convex surface on the same outer convex crease line 312 on the energy-absorbing device, the outer shell provides the initial load, when the shell is deformed, the inner convex bearing support structure provides the load support, make the whole energy-absorbing device keep the load basically constant when receiving the impact load. The synchronous deformation of the outer shell and the inward convex pressure-bearing supporting structure is ensured, and the compression space of the outer shell is not occupied after the inward convex pressure-bearing supporting structure is flattened.
As shown in the structure of fig. 7, an included angle α formed between the upper inner convex surface 371 and the lower inner convex surface 372 is preferably smaller than or equal to an included angle β formed between the upper outer convex surface 34 and the lower outer convex surface 35, and the pre-crease line and the outer crease line 312 on the inner convex pressure-bearing supporting structure 37 are located on the same horizontal plane, so as to realize the anti-symmetrical arrangement of the two structures.
The structure is preferably such that the end of the upper inner convex surface 371 is flush with the end of the upper outer convex surface 34, the end of the lower inner convex surface 372 is flush with the end of the lower outer convex surface 35, and the angle α formed between the upper inner convex surface 371 and the lower inner convex surface 372 is equal to the angle β formed between the upper outer convex surface 34 and the lower outer convex surface 35. Meanwhile, two ends of two adjacent inward convex pressure-bearing supporting structures 37 are fixedly connected through connecting steel plates 38.
The energy absorbing device 3 with the structure shown in fig. 5 is arranged in the bottom column shown in fig. 1, the simulated rock burst is carried out, the stress analysis is carried out, and the adopted model has the following dimensions: the thickness of the corrugated steel plate is 8mm. The upper part and the lower part are square, the side length is 180mm, the middle part is approximately octagonal, the side length is about 90mm, the whole body is a one-step crease, and the structure height is 168mm.
The model load-bearing capacity curve obtained by carrying out correlation analysis on the model load shown in fig. 5 by utilizing a uniaxial compression test and combining finite element calculation is shown in fig. 8. Through calculation, finite element simulation and indoor experiments, reasonable collocation between the material properties and the dimensions of the steel plate is obtained, so that the energy absorbing device 3 can absorb larger energy and stably form a preset compression structure during compression deformation.
In connection with the structure of fig. 5 and the graph shown in fig. 8, a specific compression test procedure is as follows:
and a stage: the outer shell of the energy absorption device bears the bearing capacity, basically has no deformation, and the bearing capacity is in a linear increasing state;
b, stage: the upper concave surface 32 of the energy absorber begins to shrink inwards, the compression displacement increases rapidly, the upper convex surface 34 is gradually bent and folded, the bearing capacity is temporarily reduced, and the energy absorber is in a bending and folding resistant state;
and c, stage: after the upper outer convex surface 34 is bent to a certain extent, an inner convex pressure-bearing supporting structure 37 which is arranged in an anti-symmetrical way and is positioned in the shell bears part of the axial bearing force; the outer shell and the inward convex bearing support structure 37 present alternate deformation and alternate load bearing; the lower concave surface 33 and the lower convex surface 35 are consistent with the upper concave surface 32 and the upper convex surface 34;
and d, stage: gradually and completely overlapped to finally become a stable compression structure.
As can be seen from fig. 8, the inner part is provided with an antisymmetric steel plate structure, and after the outer shell of the energy absorbing device is compressively deformed, the inward convex pressure bearing support structure starts to deform, and the bearing capacity of the inward convex pressure bearing support structure is basically balanced in the gradual compression process.
When the rock burst is pressed, the outer shell of the energy absorbing device 3 generates plastic bending and radial expansion to absorb energy, and the supporting force provided by the energy absorbing device in the compression process is kept stable or gradually increased, so that the possibility of secondary impact is reduced. When the outer shell of the energy-absorbing device is compressed, the energy-absorbing device has reasonable travel, a certain abdication process is guaranteed, the flattened structure is stabilized at the bottom of the bottom column, the occupied area of the whole shell after flattening is reduced compared with the prior art, and the flattened energy-absorbing device cannot transversely squeeze the hydraulic prop and does not damage the original supporting function of the hydraulic prop.
The invention is an external shell structure composed of steel plates with specific angle wrinkles, the specific angle is preferably 120-150 degrees, the outer convex surface is arranged in an antisymmetric way outside the inner convex surface, and a certain distance exists between the two surfaces; after the outer shell is deformed under pressure, the inward convex pressure-bearing support steel plate structure in the outer shell does not occupy the space of the outer shell, and the inward convex pressure-bearing support steel plate structure cooperatively deform.
The energy absorption device with the structure shown in the figures 5 and 9 is adopted in the hydraulic prop, when the single-shaft compression is carried out, the integral load of the energy absorption device is effectively maintained, the constant load anti-impact capacity of the energy absorption device under the impact load is enhanced, the specific distance between the outer shell and the inward convex steel plate is obtained through calculation and simulation according to the size of the integral energy absorption device, the two parts are not mutually overlapped and influenced during compression deformation, the inward convex pressure bearing supporting structure does not occupy the deformation space of the outer shell after flattening, the basically stable axial bearing capacity is effectively maintained, and the constant load anti-impact capacity of the energy absorption device under the impact load is enhanced.
In the present invention, the number of upper concave surfaces or the number of upper convex surfaces on both sides of the closed crease line 31 are respectively consistent with the number of sides of a polygonal structure formed by the upper end surface or the lower end surface of the housing. The upper and lower structures of the closed crease line are in a completely symmetrical form, namely, the upper outer convex surface and the lower outer convex surface are completely symmetrical to the outer convex crease line, and the upper inner concave surface and the lower inner concave surface are completely symmetrical to the inner concave crease line.
Of course, the invention can also be provided with a plurality of layers of the structure forms of fig. 5 and 9, and the distribution is specifically carried out according to the space size and the energy absorption strength of the bottom column.
The inward convex bearing support structure 37 in the invention can also be a steel rod structure with a bending included angle, and two ends of the steel rod structure are respectively fixed on the inner side surface of the upper outward convex surface 34 and the inner side surface of the lower outward convex surface 35.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While obvious variations or modifications are contemplated as falling within the scope of the present invention.
Claims (9)
1. The mining constant-resistance support hydraulic prop comprises an upper upright post (1) and a hollow bottom post (2), wherein the upper upright post (1) is arranged in the bottom post (2) and is in sliding connection with the inner side surface of the bottom post (2), an energy absorbing device (3) is further arranged in a cavity in the bottom post (2), the end part of the upper upright post (1) is in abutting contact with the upper end of the energy absorbing device (3), the energy absorbing device (3) is a multi-surface shell structure formed by steel plate circumferential connection, the upper end surface and the lower end surface of the shell are of polygonal structures, a closed crease line (31) formed by at least one head-tail connection is arranged on the shell, the closed crease line (31) comprises an inner concave crease line (311) and an outer convex crease line (312), the inner concave crease line (311) and the outer convex crease line (312) are alternately arranged on the closed crease line (31), concave surface structures (35) are respectively arranged on the upper side and the lower side of the shell, the concave crease line (311) are respectively provided with concave surfaces (32) which are connected, the concave surfaces (35) are arranged on the outer side surfaces (35) of the shell, the outer concave surfaces (35) are respectively arranged on the outer side surfaces of the shell, or an inward convex pressure-bearing supporting structure (37) which is connected with the inner side of the upper outer convex surface (34) and the inner side of the lower outer convex surface (35) at the same time and protrudes towards the middle part of the shell is arranged on the inner side of the outer convex crease line (312);
the outer convex pressure-bearing support structure (36) comprises an upper pressure-bearing support structure (361) arranged along the axial bearing force direction of each upper outer convex surface (34), wherein a plurality of upper pressure-bearing support structures (361) are arranged at intervals in the direction perpendicular to the axial bearing force, the upper pressure-bearing support structures (361) enable the wall thickness of the upper outer convex surfaces (34) in the direction perpendicular to the axial bearing force to be arranged in a non-uniform thickness manner, and the maximum axial bearing force born by the upper pressure-bearing support structures (361) in compression deformation is kept in a nearly constant state; the male pressure bearing support structure (36) further comprises a plurality of lower pressure bearing support structures (362) disposed along the outer side of each lower outer convex surface (35);
the inner convex pressure-bearing support structure (37) is a steel plate structure with a pre-folding line, and comprises an upper inner convex surface (371) and a lower inner convex surface (372) which are connected with each other in an included angle, each group of the upper outer convex surface (34) and the lower outer convex surface (35) of the shell are respectively provided with an inner convex pressure-bearing support structure (37) extending towards the middle of the shell, and two ends of the inner convex pressure-bearing support structure (37) are respectively fixedly connected with the inner side surface of the upper outer convex surface (34) and the inner side surface of the lower outer convex surface (35).
2. The mining constant-resistance support hydraulic prop according to claim 1, wherein a section of energy-absorbing transition section (4) is arranged at the lower end of the upper upright post (1), the energy-absorbing transition section (4) is in sliding fit with the inner side surface of the bottom post (2), the length of the overlapping part of the energy-absorbing transition section (4) and the bottom post (2) is not less than 1/8 of the height of the energy-absorbing device (3), and the energy-absorbing transition section (4) is in propping-against with the upper end of the energy-absorbing device (3).
3. The mining constant-resistance support hydraulic prop according to claim 1, characterized in that the lower pressure-bearing support structure (362) is provided separately from the corresponding upper pressure-bearing support structure (361).
4. A mining constant resistance support hydraulic prop according to claim 3, characterized in that the lower pressure bearing support structure (362) on the lower outer convex surface (35) is arranged in the extension direction of the upper pressure bearing support structure (361) on the upper outer convex surface (34) corresponding thereto.
5. The mining constant-resistance support hydraulic prop according to claim 4, wherein each upper outer convex surface (34) is provided with two upper bearing support structures (361), each lower outer convex surface (35) is provided with two lower bearing support structures (362), and the upper bearing support structures (361) and the lower bearing support structures (362) are arranged near two ends of the outer convex crease line (312).
6. The mining constant-resistance support hydraulic prop according to claim 5, wherein an included angle α formed between the upper inner convex surface (371) and the lower inner convex surface (372) is smaller than or equal to an included angle β formed between the upper outer convex surface (34) and the lower outer convex surface (35), and the pre-crease of the inner convex pressure-bearing support structure (37) and the outer convex crease line (312) are located on the same horizontal plane.
7. The mining constant resistance support hydraulic prop according to claim 6, wherein the end of the upper inner convex surface (371) is flush with the end of the upper outer convex surface (34), the end of the lower inner convex surface (372) is flush with the end of the lower outer convex surface (35), and an included angle α formed between the upper inner convex surface (371) and the lower inner convex surface (372) is equal to an included angle β formed between the upper outer convex surface (34) and the lower outer convex surface (35).
8. The mining constant-resistance support hydraulic prop according to any one of claims 5-7, characterized in that two ends of adjacent two of the inward convex pressure-bearing support structures (37) are fixedly connected by a connecting steel plate (38).
9. The mining constant-resistance support hydraulic prop according to claim 1, characterized in that the inward convex bearing support structure (37) or the outward convex bearing support structure (36) is a steel rod or bar structure arranged at an included angle.
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| CN201910642465.XA CN110307020B (en) | 2019-07-16 | 2019-07-16 | Mining constant-resistance support hydraulic prop |
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| CN110307020A (en) | 2019-10-08 |
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