WO2022141581A1

WO2022141581A1 - Hydraulic support double-cavity post jack structure and energy-absorption, impact-resistance and constant-resistance method thereof

Info

Publication number: WO2022141581A1
Application number: PCT/CN2020/142524
Authority: WO
Inventors: 陈连军; 张治高
Original assignee: 山东科技大学
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2022-07-07

Abstract

A hydraulic support double-cavity post jack structure and an energy-absorption, impact-resistance and constant-resistance method thereof. A movable column (2) is inserted into a cavity of an outer cylinder (1), and the lower end of the movable column (2) separates the cavity into an upper cavity (3) and a lower cavity (4); a piston (5) is provided in the lower cavity (4) to separate the lower cavity (4) into a liquid storage cavity (6) and a buffer cavity (7); the liquid storage cavity (6) is located on the side close to the movable column (2); the buffer cavity (7) is located under the piston (5), an elastic component (8) abutting against the piston (5) is provided in the buffer cavity (7), and the elastic component (8) can be compressed when bearing an impact load, and can be restored after the impact load is released. When bearing an impact load, the post jack can instantaneously yield, solving the problem of damage to a support caused by the fact that the existing safety valves cannot instantaneously release pressure; once the impact load is released, the post jack can recover supporting strength of a support, thereby achieving constant-resistance supporting of a roof and improving the safety of a roof.

Description

A hydraulic support double-chamber column jack structure and its energy absorption, impact resistance and constant resistance method

technical field

The invention relates to the field of ground impact prevention and control, in particular to a hydraulic support double-chamber column jack structure and a method for energy absorption, impact resistance and constant resistance.

Background technique

In the prior art, the unit type advanced hydraulic support has become the standard advanced support form for rockburst mines, and the support strength, stability and impact resistance have been greatly improved compared with other support forms. At present, the unloading and pressure letting function of all supports are realized by opening the safety valve on the hydraulic system of the column to release the liquid, and it takes a certain time from the opening of the safety valve to the liquid releasing. When the impact ground pressure occurs, the huge impact load is instantly transmitted to the safety valve through the bracket. Since the safety valve cannot release the liquid and relieve the pressure instantaneously, the bracket cannot be released through the hydraulic system and become a rigid structure. This is when the impact ground pressure occurs. The root cause of damage to all support and support structures. That is, the column jack, which is the main working part of the bracket, does not have the function of instantaneous liquid release and pressure relief, which causes problems such as column breakage, bracket tipping, top beam breakdown, and bottom bracket damage when impact ground pressure occurs, resulting in frequent injury accidents. send.

In view of the above problems, the existing technology adopts the energy-absorbing nuclear pressure-yielding technology, which is currently the only shock-resistant technology that can achieve mechanical pressure-yielding through the external structure of the column hydraulic system. After the energy-absorbing core technology is applied to the support, the energy-absorbing core can be mechanically compressed when the ground shock occurs, and the energy-absorbing core is deformed to achieve energy absorption, which plays the role of anti-impact and protecting the support structure.

For example, the Chinese patent application number CN201921113811.7 provides a corrugated constant resistance energy absorption device, which is a specific energy absorption core structure, and specifically discloses that the energy absorption device is a multi-faceted shell. Structure, the shell is provided with closed crease lines, including inner concave and outer convex arc crease lines, the inner concave arc crease line and the outer convex arc crease line are alternately arranged on the closed crease line, located at the The diameter of the circumscribed circle of all convex arc fold lines on the outer side of the shell is larger than the diameter of the circumscribed circle of the upper and lower end faces of the shell; the upper and lower sides of the convex arc fold line are respectively provided with an upper arc convex surface and a lower Arc convex surface, upper and lower arc concave positions of the inner concave arc creasing line are respectively provided with an upper arc concave surface and a lower arc concave surface, between the upper arc convex surface and the upper arc concave surface, the lower arc convex surface and the lower arc concave surface They are respectively connected by arc transition, so that the upper end face and lower end face of the shell have a circular corrugated structure.

Although the above-mentioned energy absorbing device can play a role of giving way when the impact ground pressure occurs, it can play some protective effect on the upright column and the bracket. However, the existing energy-absorbing core pressure-yielding technology has the following problems. Because the energy-absorbing core cannot be recovered after being compressed, it cannot achieve constant resistance support, and because the energy-absorbing core is an external structure installed at the bottom of the support column through the "extended" column , losing part of the column strength. In addition, since the energy-absorbing core will be severely damaged when it is compressed and destroyed, sparks are easily generated, and another kind of disaster threat is generated. It is necessary to install an explosion-proof shell outside the energy-absorbing core during manufacturing, which is complicated in process and low in reusability.

SUMMARY OF THE INVENTION

The first object of the present invention is to provide a double-chamber column jack structure for a hydraulic support, which can solve the problems of low strength, poor safety, complex process and low reusability existing in the prior art;

Another object of the present invention is to provide a method for energy absorption, impact resistance and constant resistance, which adopts the hydraulic support double-chamber column jack structure as described above.

The invention provides a hydraulic support double-chamber column jack structure, which comprises an outer cylinder and a movable column;

The movable column is inserted into the cavity of the outer cylinder, the lower end of the movable column is sealed with the cavity, and the lower end of the movable column divides the cavity into an upper cavity and a lower cavity;

The lower chamber is provided with a piston, and the piston divides the lower chamber into a liquid storage chamber and a buffer chamber;

The liquid storage chamber is located on the side close to the living column;

The buffer cavity is located at the lower part of the piston, and an elastic part abutting against the piston is arranged in the buffer cavity. The elastic part can maintain the stability of the liquid storage cavity under normal conditions. After release, the elastic member can be reset.

Preferably, the lower end of the movable column is provided with a movable column composite sealing ring, and the movable column is sealedly connected to the cavity through the movable column composite sealing ring.

Preferably, the lower part of the liquid storage chamber is provided with a drain hole, and a safety valve is provided at the drain hole.

Preferably, both the upper cavity and the lower cavity are provided with hydraulic oil holes, and threaded joints are provided at the hydraulic oil holes.

Preferably, the elastic member is a spring.

Preferably, the elastic member is a butterfly spring.

Preferably, the lower end of the piston is provided with a stabilizer pin, the upper end of the butterfly spring is sleeved in the stabilizer pin, and the lower end of the butterfly spring is in contact with the bottom surface of the lower cavity.

Preferably, the lower end of the buffer cavity is provided with an explosion-proof hole.

Preferably, the upper end of the buffer cavity is provided with a limiting portion, and the limiting portion is provided with a channel connecting the liquid storage cavity and the buffer cavity;

The piston is arranged at the lower part of the limiting part to prevent the piston from entering the liquid storage chamber.

Preferably, a piston composite sealing ring is provided on the outside of the piston.

A method for energy absorption, impact resistance and constant resistance, the method adopts the hydraulic support double-chamber column jack structure as described above, and includes the following steps:

Use the hydraulic support double-chamber column jack structure on the hydraulic support;

When the hydraulic support is in a normal support state, the elastic component maintains the stability of the liquid storage chamber;

When the hydraulic support is subjected to impact load, the impact force is transmitted from the movable column to the liquid storage chamber, the liquid in the liquid storage chamber pushes the piston to move, and the piston compresses the elastic parts to achieve energy absorption and pressure release;

After the impact load is released, the elastic part resets, pushes up the piston, transfers the energy to the movable column through the liquid storage chamber, and the movable column recovers the support to achieve constant resistance.

Beneficial effects:

In this embodiment, on the basis of the existing column, the lower chamber is divided into a liquid storage chamber and a buffer chamber by a piston, and an elastic component is arranged in the buffer chamber. Compared with the prior art, the hydraulic support has the functions of instantaneous pressure yielding and constant resistance during the occurrence of the impact ground pressure. At the moment when the impact ground pressure occurs, the impact load of the top plate is transmitted to the piston through the movable column, and then through the compression of the elastic component, the instantaneous pressure relief is realized, which effectively solves the problem of bracket damage caused by the inability of the existing safety valve to instantaneously relieve pressure.

After the impact load is released, the elastic parts return to their original state instantly, push the piston to move upward, and use the hydraulic oil in the liquid storage chamber to lift the live column, so that the jack resumes work, and the support strength of the support is restored to realize the constant resistance support of the top plate. Improve roof safety. The problem that the energy-absorbing core cannot be recovered after being compressed and the constant resistance support cannot be realized in the existing energy-absorbing nuclear pressure-yielding technology is solved.

In addition, the column jack provided by this embodiment only needs to add a piston in the lower chamber of the column, divide the lower chamber into a liquid storage chamber and a buffer chamber, and set an elastic component in the buffer chamber, and the newly added structure is arranged in the column jack, It solves the problem that the structural strength of the column is reduced because the energy-absorbing core is externally connected to the outside of the jack structure. The overall strength of the column jack structure is guaranteed, and there is no need to increase the external hydraulic pipeline system. The structure is simple, safer, and has intrinsic safety characteristics.

Finally, in this embodiment, the functions of energy absorption, pressure yielding, and constant resistance are realized by the compression and reset of the elastic components. This process is relatively smoother than the yielding pressure of the energy absorption core, and can be reused. The invention solves the problems of complicated process and low reusability caused by the fact that the existing energy-absorbing nuclear technology will be severely damaged due to the compression and destruction of the energy-absorbing nuclear, and sparks are easily generated.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a double-chamber column jack structure of a hydraulic support provided by a specific embodiment of the present invention.

Description of reference numbers:

1: outer cylinder; 2: movable column; 3: upper cavity; 4: lower cavity; 5: piston; 6: liquid storage cavity; 7: buffer cavity; 8: elastic part; 9: movable column compound sealing ring; 10: Drain hole; 11: Safety valve; 12: Hydraulic oil hole; 13: Threaded joint; 14: Stabilizer; 15: Explosion-proof hole; 16: Limiting part; 17: Piston compound seal.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "top", "bottom", "front", " Or The positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, Therefore, it should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined as "first", "second" may expressly or implicitly include one or more of said features. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be It is directly connected, or it can be indirectly connected through an intermediate medium, and it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

As shown in FIG. 1 , in this embodiment, a hydraulic support double-chamber column jack structure is provided, which includes an outer cylinder 1 and a movable column 2 .

The movable column 2 is inserted into the cavity of the outer cylinder 1 , the lower end of the movable column 2 is sealedly connected with the cavity, and the lower end of the movable column 2 divides the cavity into an upper cavity 3 and a lower cavity 4 . Here, the lower end of the movable column 2 is in sealing connection with the cavity, specifically, the lower end of the movable column 2 is slidably and sealingly connected with the cavity.

A piston 5 is arranged in the lower chamber 4, and the piston 5 divides the lower chamber 4 into a liquid storage chamber 6 and a buffer chamber 7, so that the lower chamber 4 forms a double-chamber structure.

The liquid storage chamber 6 is located on the side close to the movable column 2 .

The buffer chamber 7 is located at the lower part of the piston 5 and is provided with an elastic member 8 abutting against the piston 5 in the buffer chamber 7. The elastic member 8 can maintain the stability of the liquid storage chamber 6 under normal conditions, and when bearing an impact load, the elastic member 8 can After compression and release of the shock load, the elastic member 8 can be reset. That is to say, under normal conditions, the elastic member 8 is in a partially compressed state, and after being subjected to an impact load, the elastic member 8 can continue to compress to achieve pressure relief.

The elastic member 8 can maintain the stability of the liquid storage chamber 6 under normal conditions, specifically, the liquid storage chamber 6 and the upper chamber 3 are connected with the hydraulic pipeline, and hydraulic oil is input into the liquid storage chamber 6 and the upper chamber 3 through the hydraulic pipeline or Return the oil to adjust the position of the movable column 2. In the process of inputting hydraulic oil or returning oil to the liquid storage chamber 6 and the upper chamber 3, ensure that the position of the piston 5 remains unchanged or does not change much. Therefore, it is possible to ensure that the liquid storage chamber 6 has a stable pressure when hydraulic oil is input or oil is returned, to ensure that the column jack is normally in a supporting state, to bear the self-weight pressure of the roof, and to maintain the force balance of the roadway.

When bearing the impact load, the elastic member 8 can be compressed. Specifically, when the bracket is subjected to the impact dynamic load, the impact force will be transmitted to the liquid storage chamber 6 through the movable column 2, and the liquid storage chamber 6 compresses the elastic member 8 through the piston 5. That is, the piston 5 moves to the buffer chamber 7, so the space of the liquid storage chamber 6 will become larger, which provides a running space for the retraction of the movable column 2, and realizes the pressure relief, that is, when the impact load is received, the elastic member 8 instantaneously Compression absorbs energy, realizes pressure yielding, protects the column and bracket, and completes the function of absorbing and yielding pressure.

After the impact load is released, the elastic member 8 can be reset. Specifically, the elastic member 8 is in a compressed state when bearing the impact load. When the impact dynamic load is over, the elastic member 8 quickly releases elastic energy, pushes the piston 5 to reset, and enters the buffer. The hydraulic oil in the cavity 7 returns to the liquid storage cavity 6, pushes the movable column 2 to restore the support, and realizes the function of constant resistance.

To sum up, the double-chamber column jack structure of the hydraulic support provided in this embodiment has the following advantages.

In this embodiment, on the basis of the existing column, the lower chamber 4 is divided into a liquid storage chamber 6 and a buffer chamber 7 by the piston 5 , and an elastic member 8 is arranged in the buffer chamber 7 . Compared with the prior art, the hydraulic support has the functions of instantaneous pressure yielding and constant resistance during the occurrence of the impact ground pressure. At the moment when the impact ground pressure occurs, the impact load of the roof passes through the movable column 2, and the movable column 2 transmits the impact load to the piston 5 through the hydraulic oil in the liquid storage chamber 6, and then through the compression of the elastic component 8, the instantaneous pressure relief is realized, which effectively solves the problem of the current situation. There is a problem of bracket damage caused by the inability of the safety valve to relieve pressure instantaneously.

After the impact load is released, the elastic member 8 instantly returns to its original state, the elastic member 8 pushes the piston 5 to move upward, and the hydraulic oil in the liquid storage chamber 6 lifts the movable column 2 up, so that the jack resumes work and the support strength of the bracket is restored. The constant resistance support for the roof improves the safety of the roof. The problem that the energy-absorbing core cannot be recovered after being compressed and the constant resistance support cannot be realized in the existing energy-absorbing nuclear pressure-yielding technology is solved.

In addition, the column jack provided in this embodiment only needs to add a piston 5 in the lower chamber 4 of the column, divide the lower chamber 4 into a liquid storage chamber 6 and a buffer chamber 7, and set an elastic member 8 in the buffer chamber 7. The newly added The structure is arranged in the column jack, which solves the problem of reducing the structural strength of the column because the energy absorbing core is externally connected to the outside of the jack structure. The overall strength of the column jack structure is guaranteed, and there is no need to increase the external hydraulic pipeline system. The structure is simple, safer, and has intrinsic safety characteristics.

It should be noted that, if the elastic member 8 wants to achieve the above functions, it is mainly related to the minimum working pressure and the maximum working pressure of the elastic member 8 . Preferably, the minimum working pressure of the elastic member 8 is 41.5Mpa, and the maximum working pressure is not less than 55Mpa.

The lower end of the movable column 2 is provided with a movable column composite sealing ring 9 , and the movable column 2 is sealedly connected with the cavity through the movable column composite sealing ring 9 . Through the arrangement of the movable column composite sealing ring 9, a sliding sealing structure is formed between the movable column 2 and the cavity, and relatively independent upper cavity 3 and lower cavity 4 are formed in the cavity.

The lower part of the liquid storage chamber 6 is provided with a drain hole 10 , and a safety valve 11 is provided at the drain hole 10 . When the force in the liquid storage chamber 6 reaches the opening pressure of the safety valve 11, the safety valve 11 opens to relieve the pressure.

The safety valve 11 is pressure-relieved in a normal working state (without being subjected to an impact load). Under normal working conditions, the hydraulic support bears a static load. If the static load is too large, the safety valve 11 will open to release the oil pressure.

To sum up, in the present embodiment, the safety valve 11 discharges the pressure in the normal working state, and the buffer chamber 7 discharges the pressure when the shock load is applied. The triggering conditions for the pressure relief of the safety valve 11 and the pressure release of the buffer chamber 7 (the opening pressure of the safety valve 11 and the working pressure of the elastic member 8) can be set according to actual needs.

Both the upper chamber 3 and the lower chamber 4 are provided with hydraulic oil holes 12 , and threaded joints 13 are provided at the hydraulic oil holes 12 . The hydraulic oil hole 12 communicates with the hydraulic pipeline through the threaded joint 13 , and the hydraulic pipeline transmits hydraulic oil or oil return to the upper chamber 3 and the lower chamber 4 through the hydraulic oil hole 12 , thereby controlling the lifting and lowering of the movable column 2 .

The elastic member 8 is a spring. Further, the elastic member 8 is a butterfly spring. The minimum working pressure of the butterfly spring is 41.5Mpa, and the maximum working pressure is not less than 55Mpa.

The lower end of the piston 5 is provided with a stabilizer 14 , the upper end of the butterfly spring is sleeved in the stabilizer 14 , and the lower end of the butterfly spring is in contact with the bottom surface of the lower cavity 4 .

The stud 14 has a column-shaped protrusion structure, the upper end of the butterfly spring has a hole-shaped structure, and the column-shaped protrusion structure of the stud 14 is inserted into the hole-shaped structure of the butterfly spring. Thereby, the stability of the installation of the butterfly spring can be improved.

In this embodiment, the elastic member 8 adopts a disc spring, as a component for absorbing and releasing energy, mainly the disc spring can complete the instantaneous deformation, absorb the energy converted from the impact pressure, and at the same time can transmit the energy through the piston 5 Give the live column 2, restore the support force, and ensure the support strength of the roof.

In addition, the use of a butterfly spring for the elastic member 8 in this embodiment is only a preferred solution. Of course, other structures that deform under the action of external force and return to the original shape after removing the external force, such as rubber elastic parts, are not excluded.

The lower end of the buffer chamber 7 is provided with an explosion-proof hole 15 . Through the arrangement of the explosion-proof hole 15 , when the piston 5 compresses the elastic member 8 , the gas in the buffer chamber 7 is discharged from the explosion-proof hole 15 , so as to avoid the problem of excessive pressure in the buffer chamber 7 . Of course, if the buffer chamber 7 is set as a vacuum chamber, the buffer chamber 7 may not be provided with the explosion-proof hole 15 .

The upper end of the buffer chamber 7 is provided with a limiting portion 16 , the limiting portion 16 is provided with a channel connecting the liquid storage chamber 6 and the buffer chamber 7 , and the piston 5 is arranged at the lower portion of the limiting portion 16 to prevent the piston 5 from entering the liquid storage chamber 6 .

Specifically, the limiting portion 16 may be a limiting ring disposed at the upper end of the buffer cavity 7 , the limiting ring is coaxially arranged with the buffer cavity 7 , and the inner diameter of the limiting ring is smaller than the outer diameter of the piston 5 , therefore, the limiting ring can A limit for the piston 5 is formed to prevent the piston 5 from entering the liquid storage chamber 6 .

In addition, in order to facilitate the assembly of the limit ring, the limit ring and the outer cylinder 1 are made into an integrated structure.

A piston composite sealing ring 17 is provided on the outside of the piston 5 . Through the arrangement of the piston composite sealing ring 17 , the piston 5 and the lower chamber 4 form a sliding sealing structure, so that the liquid storage chamber 6 and the buffer chamber 7 form two independent chambers, preventing the hydraulic oil in the liquid storage chamber 6 Entering the buffer chamber 7 causes the buffer chamber 7 to disable the pressure function.

In this embodiment, the working resistance that the column jack can withstand is not less than 500KN. The working resistance here can be selected according to the actual needs of the corresponding column jack.

In this embodiment, one buffer chamber 7 is used. In actual use, multiple buffer chambers 7 can also be used, such as two buffer chambers 7, three buffer chambers 7, etc. When multiple buffer chambers 7 are used , a plurality of buffer chambers 7 can be arranged in series in sequence. In addition, the size of the elastic member 8 can also be adjusted as required, so as to adjust the pressure relief capability of the column jack.

In this embodiment, a method for energy absorption, impact resistance and constant resistance is also provided. The method adopts the hydraulic support double-chamber column jack structure as described above, and includes the following steps:

After the impact load is released, the elastic component resets, pushes up the piston, transfers the energy to the movable column through the liquid storage chamber, and the movable column restores the support to achieve constant resistance.

In order to further describe the structure of the double-chamber column jack of the hydraulic support, the present embodiment also provides a specific method of using the structure of the double-chamber column of the hydraulic support.

The hydraulic support double-chamber column jack structure is used on the hydraulic support. The hydraulic support includes the support top beam and the support base, and the column jack is connected and fixed with the support top beam and the support base by pin shafts.

When the hydraulic support is in a normal support state, it bears the self-weight pressure of the roof and maintains the force balance of the roadway.

When the hydraulic support is subjected to an impact force from the upper and/or bottom, the impact force acts on the top beam and/or the base of the support, and the impact force is transmitted from the movable column 2 to the liquid storage chamber 6. When the movable column 2 moves downward, the compression In the liquid storage chamber 6, the impact energy continues to compress the piston 5, the piston 5 transfers the impact force to the disc spring, the disc spring is compressed, and the gas in the buffer chamber 7 is discharged through the explosion-proof hole 15. When the impact energy is released, the disc spring returns to its original state, lifts the piston 5, and transmits the energy to the movable column 2 through the liquid storage chamber 6. The movable column 2 lifts the top beam of the hydraulic support to restore the supporting strength of the hydraulic support, and the hydraulic pressure The support is restored to the state of being connected to the top and the bottom, and then the hydraulic support restores the force on the top and bottom of the roadway to ensure the integrity of the roadway.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims

A hydraulic support double-chamber column jack structure is characterized in that it comprises an outer cylinder and a movable column;

The movable column is inserted into the cavity of the outer cylinder, the lower end of the movable column is sealed with the cavity, and the lower end of the movable column divides the cavity into an upper cavity and a lower cavity;

The lower chamber is provided with a piston, and the piston divides the lower chamber into a liquid storage chamber and a buffer chamber;

The liquid storage chamber is located on the side close to the living column;

The buffer chamber is located at the lower part of the piston, and an elastic member abutting against the piston is arranged in the buffer chamber. The elastic member can maintain the stability of the liquid storage chamber under normal conditions. After the load is released, the elastic member can be reset.
The double-chamber column jack structure of the hydraulic support according to claim 1, wherein the movable column is provided with a movable column composite sealing ring at the lower end, and the movable column is sealed with the cavity through the movable column composite sealing ring.
The double-chamber column jack structure for a hydraulic support according to claim 1, characterized in that, the lower part of the liquid storage chamber is provided with a drain hole, and a safety valve is provided at the drain hole.
The double-chamber column jack structure for a hydraulic support according to claim 1, wherein the upper chamber and the lower chamber are provided with hydraulic oil holes, and threaded joints are provided at the hydraulic oil holes.
The double-chamber column jack structure for a hydraulic support according to claim 1, wherein the elastic component is a spring.
The double-chamber column jack structure for a hydraulic support according to claim 5, wherein the elastic component is a butterfly spring.
The double-chamber column jack structure of the hydraulic support according to claim 6, characterized in that, the lower end of the piston is provided with a stabilizing pin, the upper end of the butterfly spring is sleeved in the stabilizing pin, and the lower end of the butterfly spring is provided with a stabilizing pin. abuts against the bottom surface of the lower cavity.
The double-chamber column jack structure of the hydraulic support according to claim 1, wherein the lower end of the buffer chamber is provided with an explosion-proof hole.
The double-chamber column jack structure of the hydraulic support according to claim 1, characterized in that, a limiting portion is provided on the upper end of the buffer cavity, and a channel connecting the liquid storage cavity and the buffer cavity is provided on the limiting portion;

The piston is arranged at the lower part of the limiting part to prevent the piston from entering the liquid storage chamber.
A method for energy absorption, impact resistance and constant resistance, characterized in that the method adopts the hydraulic support double-chamber column jack structure according to any one of claims 1-9, comprising the following steps:

Use the hydraulic support double-chamber column jack structure on the hydraulic support;

When the hydraulic support is in a normal support state, the elastic component maintains the stability of the liquid storage chamber;

When the hydraulic support is subjected to impact load, the impact force is transmitted from the movable column to the liquid storage chamber, the liquid in the liquid storage chamber pushes the piston to move, and the piston compresses the elastic parts to achieve energy absorption and pressure release;

After the impact load is released, the elastic component resets, pushes up the piston, transfers the energy to the movable column through the liquid storage chamber, and the movable column restores the support to achieve constant resistance.