WO2011032525A1 - Soupape de limitation de pression pour grandes largeurs de raccordement - Google Patents

Soupape de limitation de pression pour grandes largeurs de raccordement Download PDF

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Publication number
WO2011032525A1
WO2011032525A1 PCT/DE2009/001305 DE2009001305W WO2011032525A1 WO 2011032525 A1 WO2011032525 A1 WO 2011032525A1 DE 2009001305 W DE2009001305 W DE 2009001305W WO 2011032525 A1 WO2011032525 A1 WO 2011032525A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
pressure relief
spring
piston
relief valve
Prior art date
Application number
PCT/DE2009/001305
Other languages
German (de)
English (en)
Inventor
Wolfgang Voss
Original Assignee
Wolfgang Voss
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wolfgang Voss filed Critical Wolfgang Voss
Priority to PCT/DE2009/001305 priority Critical patent/WO2011032525A1/fr
Publication of WO2011032525A1 publication Critical patent/WO2011032525A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
    • F16K17/0446—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with an obturating member having at least a component of their opening and closing motion not perpendicular to the closing faces
    • F16K17/046—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded with an obturating member having at least a component of their opening and closing motion not perpendicular to the closing faces the valve being of the gate valve type or the sliding valve type
    • 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
    • E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
    • E21D15/512—Arrangement of valves

Definitions

  • the invention relates to a pressure relief valve for use in
  • Hydraulic and in oil-in-water aggregates especially in underground mining and tunneling with an executed against the force of an adjustable
  • Valve spring in the valve housing between pressure medium inlet and outlet slidably disposed valve piston, which has an axially extending blind bore and a plurality of formed in the end of the blind bore radial bores.
  • Such pressure relief valves are used in a wide variety of industrial areas to avoid pressure peaks in the hydraulic system or quickly reduce. In underground mining and tunneling they are used to protect the hydraulic longwall construction or single stamp removal (DE 35 08 986 A1). These pressure relief valves are switched on in the hydraulic circuit or oil-in-water circuit so that they can emerge in case of sudden overload, for example, by rockfalls or by other subsidence of the hanging, the pending in the stamp pressure medium so that in hydraulic or oil -in-water-aggregate no dangerous overpressure arises or this is degraded immediately.
  • Pressure relief valves adapted to these particular conditions, in particular by ensuring high flow rates.
  • Pressure damping chambers used as known from DE 102 27 976 A1.
  • the pressure medium from the arranged in the lower part of the pressure relief valve introduction to the Hydraulic or oil-in-water system connected, wherein the pressure medium is present against a valve piston which is displaced at corresponding pressure peaks against a valve spring, thereby leading the flow of the pressure medium either to lateral outlets or arranged in the axial direction of the valve outlets. Due to the connections and the holes in the pressure relief valve, the maximum achievable flow rate is limited.
  • the invention is based on the object, a pressure relief valve for flow rates of 10,000 m 3 / min. and to create more cubic meters of pressure medium, which builds small, safely switches and is suitable for high pressures.
  • Pressure relief valve also may advantageously have small dimensions. Due to the structure of the pressure relief valve, the lateral
  • Pressure medium inlet for example, be a DN 32, which in turn gives the opportunity to provide not only large flow rates, but also the
  • Valve piston at the end of a displacement is given, which corresponds to the distance between the lower edge of the radial bore of the upper level and upper edge of the valve piston plus safety dimension of 1 mm. This feature ensures that the valve piston always opens sufficiently in response of the valve and the upper level of the radial bores is fully in the spring chamber and thus discharges into this, while the lower level of the radial bores in the region of the annular channel is arranged and so highly compressed pressure medium can flow safely.
  • valve spring is formed in the valve housing as the valve piston designed as a differential piston adapted cylinder spring.
  • valve piston designed as a differential piston adapted cylinder spring.
  • a cylinder spring which is simple in construction and in dimension is provided, which thus operates very sensitively and, moreover, can certainly influence the movement of the valve piston. It has proven to be advantageous to use a valve spring in the form of a 60 - 80 kg spring.
  • valve piston or the differential pressure-providing stepped outer wall is expediently realized so that the valve piston in the area of the radial bores a larger
  • valve piston has a diameter change jump causing stepped outer diameter of 40/39 mm.
  • Diameter change jump is within the influence of the pressure medium, because according to the invention, the seal is arranged so that the
  • Diameter change jump is positioned between it and the annular channel.
  • the invention further provides that the seal at a distance to the diameter change jump than in a housing groove
  • the pressure medium acts through the gap between the valve piston and
  • Valve housing or inner wall of the valve housing to the seal out, so that the differential pressure can be selectively achieved by the differential piston.
  • blind bore it has up to the second level of the radial bores to the annular channel filling plug. After preparation of the blind bore so a corresponding plug is installed, which limits the pressure chamber within the valve piston so that a pressure change within the valve piston makes very quickly noticeable and to respond the valve contributes.
  • the production of the blind bore is simplified and ensured that it also brings or has exactly the dimensions that are important for effective operation of the pressure relief valve.
  • the stopper has an external thread corresponding to an internal thread formed in the end region of the blind bore. The plug can be placed in this way very quickly and accurately positioned in the blind hole. The necessary sealing ring is provided in the tip region of the plug, so that the pressure medium from the connection region between plug and blind bore remains excluded.
  • the movement of the valve piston within the valve housing is limited by the change in diameter downwards.
  • the movement in the direction of the valve spring is limited according to the invention in that the plug has a support edge at the free end, which is acting as a thrust limiter and slidably guided over the valve piston in an expansion bore in the valve housing.
  • This support rim also limits the threading path of the plug within the blind bore, ensuring that it exactly reaches the position when screwing in, which ensures that the second plane of the radial bore, i. H. So the lower level can not be partially closed by this plug.
  • an always sufficient displacement of the valve piston is predetermined, which ensures a fast and safe removal of the pressure medium.
  • This ring seal is a conventional sealing ring, here a rectangular or square Teflon (PTFE) or Teflon-like or HPU- Material. Exactly this material is also in the others
  • Pressure medium inlet is designed as a flange or equipped with such and moreover has a plurality of retaining screws. While the retaining screws ensure a tight connection, the
  • Flange connection advantageous because control valves are usually equipped with such Flanschan whyn.
  • valve spring can be optimally adjusted in cooperation with the valve piston, when this valve spring is loaded via a displaceable in the valve housing screw, which has the Druckstoffauslass and a long sleeve with sleeve outer thread, which is designed to correspond with the housing internal thread is.
  • Pressure relief valve for example, around 170 mm is given as a sufficient adjustment, because the screw through the long
  • Sleeve outer thread correspondingly far within the valve housing and the spring chamber is displaceable.
  • the outlet for the pressure medium is provided at the top of the set screw so that it once enters the spring chamber and flows purposefully in the direction of the pressure medium outlet and from there into the atmosphere. A quick pressure reduction is ensured.
  • the sleeve has a% of the valve body depth corresponding length.
  • the adjusting screw may protrude slightly out of the spring chamber, but this does not impair the effectiveness of the pressure relief valve and also does not impose any load on the overall length.
  • the setting range will only begin when the Adjusting screw is immersed in the valve body accordingly or just concludes.
  • About the mentioned length of the sleeve ensures that it is always connected over a sufficient number of turns with the valve body.
  • valve piston Due to the shape of the valve piston and thus the inflow of the high pressure medium in the spring chamber, the pressure medium is guided on the inner wall of the spring chamber along.
  • the interior of the valve spring is usually left out, if only because
  • the sleeve has a flow-trained inclined edge and the valve housing or the spring chamber has a pioneered from the edge of the valve piston bevel.
  • the print medium will do so
  • Pressure limiting valve provides that the valve spring, the valve piston when re-closing the valve in the sealing position is arranged pulling and formed. While according to the previously described embodiment, the valve spring is compressed in each case when opening the valve to then push the valve piston to its original position when re-closing the valve, according to this embodiment, the valve spring is initially subjected to pressure during extension of the valve piston, but then the valve piston not to push back into its starting position, but rather to pull. This has the advantage that the hydraulic fluid and other
  • the stepped outer wall is advantageously realized, so that the advantages described earlier can be achieved safely even in this embodiment of the valve. Due to its specially designed outer wall, the stepped valve piston effects a differential pressure and the certainty that the valve piston will always be displaced in the same direction, namely against the valve spring, when the pressure fluid is applied.
  • the design of the pressure medium inflow and outflow as well as the radial bores arranged in the area of the annular channel ensures that large quantities of 10,000 m 3 / min.
  • valve can be passed through such a pressure relief valve.
  • the valve responds, the annular channel increases and the pressure in the interior of the valve housing or the valve piston increases so that the valve piston shifts slightly.
  • the interior of the valve piston remains connected to the annular channel and thus the high pressure, so then after a small displacement of the valve piston, the pressure medium from the
  • Valve housing can escape and relax quickly.
  • Such a valve piston brings a higher pressure when opening and makes it possible to manage with relatively small and simple and "weak" valve springs, so that the whole
  • Pressure relief valve also advantageously has small dimensions.
  • Pressure medium inlet for example, be a DN 32, which in turn gives the opportunity not only to achieve high flow rates, but also the
  • valve spring comprising the valve piston between the other hand via the
  • valve spring is arranged clamped. This allows a relatively short design of a valve housing, which will be explained in more detail later, Advantageously, the entire space of the valve spring is kept free from the pressure medium.
  • the plug which is inserted into the valve piston from below, is anyway provided with such a support edge, which now advantageously takes over the function with, to ensure the spring tension.
  • valve spring it is expedient if it is arranged inside the valve housing, which is also the case with the valve described above, except that in this case the valve housing must have a different construction in order to encompass the correspondingly differently assigned valve spring.
  • valve housing forms as described one
  • the ring seal is assigned, which can thus be brought close to the valve piston and arranged, so that the spring chamber as such is also effectively sealed against the annular channel and the pressure medium.
  • valve piston is connected to the stepped outer wall via a connecting screw with the stopper, which is formed with its support edge having approach in the valve body enclosed by the valve spring inserted, wherein the valve spring between the support edge and one of the pressure medium inlet and annular channel formed on the valve housing formed opposite edge.
  • the actual valve piston can build very short, because now the tight-fitting valve housing no longer receives the valve spring, but rather is designed only outside leading.
  • the actual valve piston is connected to the plug and the support edge via a connecting screw, which can be done via this connecting screw clamping of the valve spring, for the support edge on the one hand and the special shape of the valve housing defines the annular surfaces against which this can support the valve spring. Since the entire valve body according to the DIN regulations anyway must be covered by a protective housing, which is special
  • valve spring on the outer edge of the valve housing without problems.
  • the advantage is that it gets along with much less sealing rings, which has a positive effect in terms of cost.
  • valve spring is advantageously secured with respect to bias, because the end edge of the valve spring encompassed by the valve housing at the same time
  • valve piston can thus be retracted only to the spring safety, when the valve piston in the
  • valve piston When tensioning the valve spring, the valve piston must not rotate, which can be prevented according to the invention, characterized in that the valve piston has a protruding over the valve housing piston head, in the free head surface, a fixing slot is recessed.
  • a fixing slot is recessed.
  • valve housing has an annular stem in the region of the annular channel and the pressure medium inlet with mounting holes.
  • Mounting bores usually six, can be fitted with screws or other fasteners so as to cover the entire valve body with valve piston and others
  • the invention is characterized in that a pressure relief valve is proposed, which initially builds very small and thus is particularly well used in the field of control units and is also constructed so that with a relatively simple and small valve spring large amounts of pressure medium then can dissipate when the valve has responded and the quantities by the again sized accordingly large
  • FIG. 1 shows a longitudinal section through a pressure relief valve
  • Figure 2 is an external view of the pressure relief valve in
  • Figure 4 is a pressure relief valve with a by a
  • Figure 5 is a pressure relief valve with external
  • FIG. 6 shows the embodiment of the invention shown in FIG.
  • Figure 1 shows a pressure relief valve 1 with a one-piece
  • Valve housing 2 Within the spring chamber 44, a valve spring 3 is arranged, which is clamped between the adjusting screw and the valve piston 5.
  • the valve piston 5 normally prevents a flow of the pressure medium from the pressure medium inlet 6 to the pressure medium outlet 7.
  • the valve spring 3 presses the valve piston 5 in the apparent from Figure 1 seat. Now enters an overload in hydraulic or oil-in-water system Thus, the pressure on the pressure medium, which is present in the region 14 in the interior of the valve piston 5 via the pressure medium inlet 6, increases, and the valve piston 5 is displaced against the force of the valve spring 3 in the direction of the adjusting screw 4 or pressure medium outlet 7.
  • valve housing 2 an annular channel 15 is formed.
  • the corresponding pressure medium is always present around the valve piston 5, which can then penetrate through the radial bores 10 into the blind bore 9 of the valve piston 5 and thus into the region 14.
  • Figure 1 and Figure 3 illustrate that a correspondingly large number of radial bores 10 is formed in two planes 11 and 12, wherein the plane 11 tightly under the lid 13 of the
  • Valve piston 5 is located. Now increases the pressure of the pressure medium within the range 14 so far that thus the contact pressure of the valve spring 3 is overcome or is lower, the valve piston 5 shifts within the range 14 so far that thus the contact pressure of the valve spring 3 is overcome or is lower, the valve piston 5 shifts within the range 14
  • Radial holes 10 is pushed beyond the outer seal 46 and piston seal 50, whereupon the pressure medium penetrates into the spring chamber 44 and then leaves the pressure relief valve 1 via the pressure medium outlet 7 again.
  • the cover 13 forms the end region 8 of the valve piston 5, which is pushed beyond the piston seal 50 when the pressure limiting valve 1 responds. Also in this position, the pressure medium can easily flow into the region 14, because the radial bores 10 in the plane 12 are still in communication with the annular channel 15.
  • Diameter change jump 20 formed.
  • the diameter above this diameter change jump 20 for example, 40 mm and the lower 39 mm.
  • the seal 17 consists of a sealing ring 19, which is arranged in a corresponding housing groove 18.
  • Diameter change jump 20 in the outer wall 21 of the valve piston 5 ensures a smooth and sensitive course of movement of the
  • Valve piston 5 so that you can work with the shown simple and small valve spring 3.
  • the diameter change jump 20 provides a significant increase in the pressure of the valve piston 5 and thus the use of such valve springs.
  • the area 14 within the valve piston 5 and here between the two levels 1 1, 12 is correspondingly sized and kept small, because in the blind bore 9 from the piston portion 16 from a plug 22 is inserted, ie here is screwed.
  • the pressure medium inlet 6 is specified as a side inlet 33, so that the pressure medium can reach the valve piston 5 by the shortest route.
  • the side inlet 33 is designed as a flange connection 34 and equipped with retaining screws 35, 36 or holes for it, so that a secure connection can be made, for example, to a control unit easily and quickly.
  • Adjusting screw 4 accommodated, which can be moved within the valve housing 2 and the spring chamber 4, so as to adjust the valve spring 3.
  • the adjusting screw 4 has an elongated sleeve 38 with the
  • the escaping pressure medium can easily pass this guard or replace it, if correspondingly large amounts of
  • Pressure medium must escape here.
  • the pressure limiting valve 1 responds, the pressure medium, as already explained, flows through the outer seal 46 or piston seal 50 into the spring chamber 44 during the corresponding process of the cover 13.
  • a sloping edge 41 is formed on the inside of the elongated sleeve 38 and further on the inside of the spring chamber 44 a slope 43, so that the pressure medium can be dissipated streamlined as mentioned.
  • Valve piston 5 is a recess 47 with edge 42 is provided.
  • the distance 52 corresponds to the distance 53 and that plus 1 mm.
  • the distance 52 is characterized by the lower edge 54 of the radial bores 10, 1 1 and the upper edge 55 of the valve piston 5, the distance 53 by the
  • Figure 2 illustrates that a large pressure medium inlet 6 is realized, through which the pressure medium can flow into the interior of the valve piston 5.
  • the holes for the retaining screws 35, 36 of the flange 34 recognizable.
  • a very compact pressure relief valve is realized.
  • Within this compact pressure limiting valve 1 is one of the most important components of the reproduced in Figure 3 in a single representation of the valve piston 5. Recognizable here are over the height provided but not These limit the flow of pressure medium within the pressure relief valve as explained further above, here also the blind bore 9 can be seen, the end of the region 23 of the 5 blind bore 9 up to the lid 13 leads. In this lower area then the apparent from Figure 1 plug 22 is screwed, including the
  • Valve spring 3 arranged so that it the valve piston 5 after the response of the valve in the initial position, d. H. retracts to the closed position. This is achieved by the fact that the annular space or the annular channel 15 is formed with the radial bores 10 in two planes 11, 12 as well as in the
  • valve spring 3 is here clamped between an annular channel 15 final annular projection 60 and the valve piston 5 associated plug 22 and the support edge 27, wherein the valve housing 2 here this spring chamber 44 'surrounds.
  • valve piston 5 with its lying in the plane 11 radial bores 10 on the upper edge of the valve piston 5
  • Valve housing 2 has been pushed out. Although the valve is still protected here via the protective housing 75, the pressure medium can already advantageously relax in this area.
  • the protective housing 75 is according to DIN EN
  • Figure 5 shows another embodiment of the pressure relief valve, in which case the valve spring 3 is arranged outside of the valve housing 2. This representation is shown here because it shows well that here the valve housing 2 is annularly widened in the region of the annular channel 15 and the pressure medium inlet 6, so that a stem 72 results, are embedded in the mounting holes 73, 74, which give the opportunity via appropriate
  • FIG. 6 shows the embodiment already shown in FIG. 5, in which the valve spring 3 is arranged outside the valve housing 2, but as shown in FIG. 6 it shows the securing protective housing 75 according to DIN EN 1804/3: 2006 D 5.2.1. is secured against the atmosphere.
  • valve housing 2 is guided here so that it forms a counter edge 65 against which the valve spring 3 can be supported. She relies on the
  • said plug 22 here has a projection 64 which can be inserted into the correspondingly formed valve housing 2. This insertion takes place via the connecting screw 63, the
  • Valve housing protruding end has a piston head 68, in the free head surface 69, a fixing slot 17 is recessed. In this way, co-rotation of the valve piston 5 can be effectively prevented when the valve spring 3 is to be adjusted via the connecting screw 63.
  • the diameter change jump 20 is here as well

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Safety Valves (AREA)

Abstract

L'invention concerne une soupape de limitation de pression (1) destinée à être utilisée dans des systèmes hydrauliques et huile dans l'eau et constituée d'un corps de soupape compact (2), ainsi que surtout du piston de soupape (5) déplaçable dans le corps de soupape (2) à l'encontre de la force du ressort de soupape (3). Ce piston de soupape (5) présente une paroi externe étagée (21) induisant une pression différentielle et dispose d'un ressort de soupape (3) adapté au piston de soupape (5) réalisé en tant que piston différentiel. Le fluide sous pression s'écoule dans le trou borgne (9) par l'entrée latérale (33) aux dimensions importantes appropriées (DN32) ou par l'entrée de fluide sous pression (6), la conduite annulaire (15) et les alésages radiaux (10) de sorte que, en cas de déclenchement de la soupape de limitation de pression (1), le piston de soupape (5) peut être déplacé en conséquence pour évacuer le fluide sous pression.
PCT/DE2009/001305 2009-09-16 2009-09-16 Soupape de limitation de pression pour grandes largeurs de raccordement WO2011032525A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/DE2009/001305 WO2011032525A1 (fr) 2009-09-16 2009-09-16 Soupape de limitation de pression pour grandes largeurs de raccordement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/DE2009/001305 WO2011032525A1 (fr) 2009-09-16 2009-09-16 Soupape de limitation de pression pour grandes largeurs de raccordement

Publications (1)

Publication Number Publication Date
WO2011032525A1 true WO2011032525A1 (fr) 2011-03-24

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Application Number Title Priority Date Filing Date
PCT/DE2009/001305 WO2011032525A1 (fr) 2009-09-16 2009-09-16 Soupape de limitation de pression pour grandes largeurs de raccordement

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Country Link
WO (1) WO2011032525A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110671523A (zh) * 2019-01-22 2020-01-10 安徽理工大学 一种防堵塞安全阀
CN111997663A (zh) * 2020-09-30 2020-11-27 长沙矿山研究院有限责任公司 一种吸能让压型钢支架及其支护工艺

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1149979A (fr) * 1956-04-20 1958-01-03 Perfectionnements apportés aux soupapes de sûreté pour circuits de fluide sous pression
FR1261612A (fr) * 1960-06-30 1961-05-19 Bendix Westinghouse Automotive Dispositif de contrôle de la pression d'un fluide
GB1176590A (en) * 1968-08-29 1970-01-07 Amadyne Inc Improvements in or relating to Cushion Relief Valves
DE3508986A1 (de) * 1984-03-16 1985-09-19 GAT Grubenausbau GmbH, 5840 Schwerte Druckbegrenzungsventil
DE3518472A1 (de) * 1985-05-23 1986-11-27 Jörn 4320 Hattingen Dams Druckbegrenzungsventil

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1149979A (fr) * 1956-04-20 1958-01-03 Perfectionnements apportés aux soupapes de sûreté pour circuits de fluide sous pression
FR1261612A (fr) * 1960-06-30 1961-05-19 Bendix Westinghouse Automotive Dispositif de contrôle de la pression d'un fluide
GB1176590A (en) * 1968-08-29 1970-01-07 Amadyne Inc Improvements in or relating to Cushion Relief Valves
DE3508986A1 (de) * 1984-03-16 1985-09-19 GAT Grubenausbau GmbH, 5840 Schwerte Druckbegrenzungsventil
DE3518472A1 (de) * 1985-05-23 1986-11-27 Jörn 4320 Hattingen Dams Druckbegrenzungsventil

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110671523A (zh) * 2019-01-22 2020-01-10 安徽理工大学 一种防堵塞安全阀
CN111997663A (zh) * 2020-09-30 2020-11-27 长沙矿山研究院有限责任公司 一种吸能让压型钢支架及其支护工艺
CN111997663B (zh) * 2020-09-30 2022-03-01 长沙矿山研究院有限责任公司 一种吸能让压型钢支架及其支护工艺

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