CN114412533A - Double-telescopic upright column and hydraulic support with same - Google Patents

Abstract

The invention discloses a double-telescopic stand column and a hydraulic support with the same, wherein the double-telescopic stand column comprises an outer cylinder, a middle cylinder, a plunger and a bottom valve assembly, the middle cylinder is slidably inserted into the outer cylinder along the up-down direction, and an outer cylinder lower cavity and an outer cylinder upper cavity are defined between the middle cylinder and the outer cylinder; the plunger is slidably inserted into the middle cylinder along the up-down direction, and a middle cylinder lower cavity and a middle cylinder upper cavity are defined between the plunger and the middle cylinder; the bottom valve assembly is arranged at the bottom of the middle cylinder and comprises a synchronizing piece and a plurality of bottom valves, the synchronizing piece is movably arranged at the bottom of the middle cylinder between a first position and a second position, the synchronizing piece located at the first position can upwards push the valve core of each of the plurality of bottom valves to enable the bottom valves to be opened, the synchronizing piece located at the second position leaves the valve core of each of the plurality of bottom valves to enable the bottom valves to be closed, and each of the plurality of bottom valves is a hydraulic control valve which is opened under a first preset pressure. The double-telescopic upright column provided by the embodiment of the invention has the advantages of high column lifting speed and the like.

Description

Double-telescopic upright column and hydraulic support with same

Technical Field

The invention relates to the technical field of mining hydraulic support supports, in particular to a double-telescopic upright post and a hydraulic support with the same.

Background

The double telescopic vertical columns are the most important working parts of the hydraulic support, and along with the continuous increase of the coal mining strength and the mining depth, the working resistance and the supporting height of the double telescopic vertical columns are continuously increased, and the cylinder diameter of the double telescopic vertical columns is increased. The problem of slow lifting speed caused by the increase of the cylinder diameter of the double telescopic upright columns causes long frame moving time and slow propelling speed, and the coal mining efficiency is seriously influenced.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, the embodiment of the invention provides a double-telescopic stand column to improve the lifting speed of the double-telescopic stand column.

The embodiment of the invention provides a hydraulic support to improve the coal mining efficiency.

The double-telescopic upright column comprises an outer cylinder, a middle cylinder, a plunger and a bottom valve assembly, wherein the middle cylinder is slidably inserted into the outer cylinder along the up-down direction, an outer cylinder lower cavity and an outer cylinder upper cavity are defined between the middle cylinder and the outer cylinder, and the outer cylinder is provided with a first channel communicated with the outer cylinder lower cavity and a second channel communicated with the outer cylinder upper cavity; the plunger is slidably inserted into the middle cylinder along the up-down direction, a middle cylinder lower cavity and a middle cylinder upper cavity are defined between the plunger and the middle cylinder, and the plunger is provided with a third channel communicated with the middle cylinder upper cavity; the bottom valve assembly is arranged at the bottom of the middle cylinder and comprises a synchronizing piece and a plurality of bottom valves, the synchronizing piece is movably arranged at the bottom of the middle cylinder between a first position and a second position, the synchronizing piece located at the first position can upwards push a bottom valve spool of each of the bottom valves so as to open the bottom valves, the synchronizing piece located at the second position leaves the bottom valve spools of the bottom valves so as to close the bottom valves, and each of the bottom valves is a hydraulic control valve which is opened under a first preset pressure.

The double-telescopic upright column provided by the embodiment of the invention has the advantages of high column lifting speed and the like.

In some embodiments, the bottom valve comprises a bottom valve body and a protrusion, the bottom valve core is arranged in the bottom valve body, the protrusion is movably arranged at the bottom of the bottom valve body between an opening position and a closing position, the protrusion in the opening position can push the bottom valve core upwards to open the bottom valve, and the protrusion in the opening position is away from the bottom valve core so that the bottom valve is closed;

the synchronizing member is arranged at the lower side of the plurality of bottom valve bodies, the synchronizing member is movably arranged at the bottom of the middle cylinder along the up-down direction so as to move between the first position and the second position, the synchronizing member is a synchronizing plate, the synchronizing plate is provided with a channel which is through along the up-down direction, the synchronizing member at the first position can push the bulge of each of the plurality of bottom valves upwards to enable the bulge of each of the plurality of bottom valves to be located at the opening position, and the synchronizing member at the second position is away from the bulge of each of the plurality of bottom valves to enable the bulge of each of the plurality of bottom valves to be located at the closing position.

In some embodiments, the base valve assembly further includes a return elastic member provided between the middle cylinder and the synchronizing member, the return elastic member applying a downward elastic force to the synchronizing member.

In some embodiments, the base valve assembly further comprises a fastening member connected to the bottom of the middle cylinder, and the synchronizing member is movably sleeved on the fastening member in the up-down direction; the reset elastic piece is a reset spring, the reset spring is sleeved on the fastener, the lower end of the reset spring abuts against the synchronous piece, and the upper end of the reset spring abuts against the bottom of the middle cylinder.

In some embodiments, the bottom of the middle cylinder has a recess with a downward opening, a portion of the fastener is located in the recess, and the return spring is located between the portion of the fastener and a groove sidewall of the recess in the inward and outward directions.

In some embodiments, a plurality of the bottom valves are uniformly arranged in the circumferential direction of the middle cylinder.

The hydraulic support comprises the double telescopic vertical columns in any one embodiment.

The hydraulic support provided by the embodiment of the invention has the advantages of short support moving time, high propelling speed and the like, and can obviously improve the coal mining speed.

In some embodiments, the hydraulic support further comprises a hydraulic system comprising a hydraulic control check valve, a first main liquid inlet and return pipe, a second main liquid inlet and return pipe, a first liquid inlet and return pipe, a second liquid inlet and return pipe and a third liquid inlet and return pipe, wherein the hydraulic control check valve comprises a check valve body having a first port, a second port, a third port and a fourth port; one end of the first liquid inlet and return main pipe is communicated with the first port, and one end of the second liquid inlet and return main pipe is communicated with the second port; one end of the first liquid inlet and return pipe is communicated with the second port, the other end of the first liquid inlet and return pipe is communicated with the second channel, one end of the second liquid inlet and return pipe is communicated with the third port, the other end of the second liquid inlet and return pipe is communicated with the third channel, one end of the third liquid inlet and return pipe is communicated with the fourth port, and the other end of the third liquid inlet and return pipe is communicated with the first channel; when the double telescopic upright columns are used for lifting columns, the first port is communicated with the fourth port, and the third port is communicated with the second port.

In some embodiments, the check valve body further has a fifth port, and the hydraulic system further comprises a liquid return pipe, one end of which is communicated with the fifth port; wherein when the double telescopic columns are used for column descending operation, the second port is communicated with the third port, and the fourth port is communicated with each of the first port and the fifth port.

In some embodiments, the hydraulic system further comprises a solenoid valve having a first liquid inlet and return port and a second liquid inlet and return port, the other end of the first liquid inlet and return main pipe is communicated with the first liquid inlet and return port, and the other end of the second liquid inlet and return main pipe is communicated with the second liquid inlet and return port.

Drawings

Fig. 1 is a schematic structural view of a double telescopic column according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a dual telescoping mast of one embodiment of the present invention.

Fig. 3 is a schematic bottom structure view of a double telescopic column according to an embodiment of the present invention.

Fig. 4 is an enlarged view at a in fig. 3.

Fig. 5 is a schematic view of the structure of the synchronizing member of fig. 3.

Fig. 6 is a diagram of a control system for a dual telescoping mast in accordance with one embodiment of the present invention.

Reference numerals:

a double telescopic column 100;

an outer cylinder 1; a first channel 101; a second channel 102;

a middle cylinder 2; an outer cylinder lower chamber 201; an outer cylinder upper chamber 202; a groove 203;

a plunger 3; a middle cylinder lower cavity 301; a middle cylinder upper chamber 302; a third channel 303; a living cylinder chamber 304; a fourth channel 305;

a bottom valve 4; a base valve body 401; a protrusion 402;

a synchronizing member 5; a synchronization board 501; a synchronization board channel 502;

a hydraulic control check valve 6; a first port 601; a second port 602; a third port 603; a fourth port 604; a fifth port 605; a first check valve spool 607; a second one-way valve spool 608; a third check valve spool 609;

a return elastic member 7;

a fastener 8;

a first joint 9;

a second joint 10;

a first liquid inlet and return pipe 11; a second liquid inlet-return pipe 12; a third liquid inlet and return pipe 13; a liquid return pipe 14;

a solenoid valve 15;

a first main liquid inlet and return pipe 16;

and a second main liquid inlet/return pipe 17.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

As shown in fig. 1 to 6, a dual telescopic pillar 100 of an embodiment of the present invention includes an outer cylinder 1, an intermediate cylinder 2, a plunger 3, and a base valve assembly. The middle cylinder 2 is slidably inserted into the outer cylinder 1 in the up-down direction, and an outer cylinder lower cavity 201 and an outer cylinder upper cavity 202 are defined between the middle cylinder 2 and the outer cylinder 1. Wherein the outer cylinder 1 has a first passage 101 communicating with an outer cylinder lower chamber 201 and a second passage 102 communicating with an outer cylinder upper chamber 202.

The plunger 3 is slidably inserted into the middle cylinder 2 in the up-down direction, and a middle cylinder lower cavity 301 and a middle cylinder upper cavity 302 are defined between the plunger 3 and the middle cylinder 2. Wherein the plunger 3 has a third passage 303 communicating with the upper chamber 302 of the middle cylinder.

A base valve assembly is provided at the bottom of the middle cylinder 2, the base valve assembly comprising a synchronizing member and a plurality of base valves 4, the synchronizing member 5 being movably provided at the bottom of the middle cylinder 2 between a first position and a second position. The synchronizing member 5 in the first position can push the bottom valve spool of each of the plurality of bottom valves 4 upward to open the bottom valve 4, and the synchronizing member 5 in the second position leaves the bottom valve spool of each of the plurality of bottom valves 4 so that the bottom valve 4 is closed. Each of the plurality of base valves 4 is a pilot-controlled valve that opens at a first preset pressure.

In the related technology, only one bottom valve is arranged at the bottom of a middle cylinder of the double telescopic vertical columns, and a lower cavity of the middle cylinder is communicated with a lower cavity of the outer cylinder through the bottom valve. Along with the increase of the diameter of the double telescopic cylinders, the flow of the emulsion is limited by the flow area of the bottom valve, so that the problem of low lifting speed of the double telescopic columns is caused, the frame moving time is long, the propelling speed is low, and the coal mining efficiency is seriously influenced.

When the double-telescopic upright post 100 of the embodiment of the invention carries out the post lifting operation, the emulsion is introduced into the outer cylinder lower cavity 201 through the first channel 101 communicated with the outer cylinder lower cavity 201, the emulsion pushes the middle cylinder 2 to drive the plunger 3 to move upwards, at the moment, the synchronizing part 5 is positioned at the second position, and the bottom valves 4 are closed; when the middle cylinder 2 moves upwards to the highest position of the middle cylinder 2, stopping, when the pressure difference between the outer cylinder lower cavity 201 and the middle cylinder lower cavity 301 is larger than or equal to a first preset pressure, at the moment, the pressure difference between the lower side and the upper side of a bottom valve core of the bottom valve 4 is larger than or equal to the first preset pressure, the bottom valves 4 on the lower end part of the middle cylinder 2 are opened, emulsion enters the middle cylinder lower cavity 301 through the bottom valves 4, the emulsion pushes the plunger 3 to move upwards, the plunger 3 stops when moving upwards to the highest position of the plunger 3, and the process of lifting the shock-resistant double-telescopic upright column 100 is finished.

When the double-telescopic upright post 100 of the embodiment of the invention is used for descending, emulsion is introduced into the outer cylinder upper chamber 202 through the second channel 102 communicated with the outer cylinder upper chamber 202, meanwhile, the emulsion is introduced into the middle cylinder upper chamber 302 through the third channel 303 communicated with the middle cylinder upper chamber 302, the emulsion in the outer cylinder upper chamber 202 pushes the middle cylinder 2 to move downwards, at the moment, the synchronizing part 5 is located at the second position, and the bottom valves 4 are closed; when the middle cylinder 2 moves downwards to the lowest position of the middle cylinder 2 (the bottom of the middle cylinder 2 abuts against the bottom of the outer cylinder 1), stopping, at the moment, the synchronizing member 5 is located at the first position, the synchronizing member 5 pushes up the bottom valve core of each of the bottom valves 4, so that the pressure difference between the lower side and the upper side of the bottom valve core of each bottom valve 4 is greater than or equal to a first preset pressure, the bottom valves 4 are opened, the middle cylinder lower cavity 301 is communicated with the outer cylinder lower cavity 201, the emulsion in the outer cylinder upper cavity 202 pushes the plunger 3 to move downwards, the plunger 3 moves downwards to the lowest position of the plunger 3 (the bottom of the plunger 3 abuts against the bottom of the middle cylinder 2), stopping, and ending the column descending process of the anti-impact double-telescoping upright 100.

Therefore, when the double-telescopic upright post 100 performs the post lifting and post lowering operation, the middle cylinder lower cavity 301 and the outer cylinder lower cavity 201 can be communicated through the plurality of bottom valves 4, so that the flow of the emulsion can be increased, the flow speed of the emulsion entering and exiting the middle cylinder lower cavity 301 can be increased, the lifting speed of the double-telescopic upright post 100 can be increased, the frame moving time of a hydraulic support can be shortened, the propelling speed of the hydraulic support can be increased, and the coal mining efficiency can be improved. In addition, the setting of synchronizing member 5 can guarantee that a plurality of bottom valves 4 open simultaneously when falling the operation, improves the job stabilization nature of two flexible stands 100.

Therefore, the dual telescopic pillar 100 of the embodiment of the present invention has the advantages of fast pillar lifting speed, etc.

The hydraulic support with the double telescopic vertical columns 100 provided by the embodiment of the invention has the advantages of short frame moving time, high propelling speed and the like.

Alternatively, a plurality of bottom valves 4 are arranged uniformly in the circumferential direction of the middle cylinder 2.

In some embodiments, the base valve 4 includes a base valve body 401 and a protrusion 402, the base valve spool is disposed within the base valve body 401, and the protrusion 402 is movably disposed at the bottom of the base valve body 401 between an open position and a closed position. The protrusion 402 in the open position can push the base valve spool upward to open the base valve 4, and the protrusion 402 in the open position moves away from the base valve spool so that the base valve 4 is closed.

The synchronizing member 5 is provided on the lower side of the plurality of bottom valves 4, the first position is located above the second position, and the synchronizing member 5 is provided movably in the up-down direction on the bottom of the middle cylinder 2 so that the synchronizing member 5 moves between the first position and the second position. Wherein the vertical direction is as shown in fig. 1 to 4.

The synchronizing member 5 is a synchronizing plate 501, and the synchronizing plate 501 has a passage penetrating in the vertical direction. The synchronizer 5 in the first position can push the projection 402 of each of the plurality of bottom valves 4 upward to place the projection 402 in the open position, and the synchronizer 5 in the second position moves away from the projection 402 of each of the plurality of bottom valves 4 to place the projection 402 of each of the plurality of bottom valves 4 in the closed position.

For example, as shown in fig. 3 and 5, the bottom valves 4 are provided in three, and each bottom valve 4 includes a protrusion 402. The synchronizing member 5 located at the first position may push the protrusion 402 of each of the three bottom valves 4 upward, so that the protrusion 402 of each bottom valve 4 is located at the open position, and at this time, the protrusions 402 of the three bottom valves 4 push the valve core of the corresponding bottom valve 4 upward, so that the three bottom valves 4 are opened simultaneously. The synchronizing member 5 in the second position moves away from the boss 402 of each of the three base valves 4 to position the boss 402 of each of the base valves 4 in the closed position, in which the bosses 402 of the three base valves 4 move away from the base valve spools of the corresponding base valves 4, so that the three base valves 4 can be closed at the same time. Of course, it is understood that when the protrusion 402 is away from the bottom valve spool of the corresponding bottom valve 4, the bottom valve 4 will still open if the pressure difference between the upper side and the lower side of the bottom valve spool is greater than or equal to the first predetermined pressure.

Therefore, the synchronous piece 5 is simple in structure and convenient to design and process.

Furthermore, as will be understood by those skilled in the art, the synchronizing member 5 needs to be disposed at the lower side of the base valve 4, and the synchronizing member 5 is disposed at the bottom of the middle cylinder 2, thereby facilitating the assembly and disassembly of the synchronizing member 5 as compared to the case where the synchronizing member is disposed at the bottom of the outer cylinder 1.

Optionally, the base valve assembly further includes a return elastic member 7, the return elastic member 7 being provided between the middle cylinder 2 and the synchronizing member 5, the return elastic member 7 applying a downward elastic force to the synchronizing member 5.

During the operation of lifting the column by the double telescopic vertical column 100, the elastic resetting member 7 always applies an elastic force to the synchronizing member 5 to move to the second position, and when the pressure of the emulsion received by the lower side of the synchronizing member 5 is greater than the elastic force of the elastic resetting member 7, the synchronizing member 5 moves from the second position to the first position or the synchronizing member 5 is kept at the first position, and when the pressure of the emulsion received by the lower side of the synchronizing member 5 is less than the elastic force of the elastic resetting member 7, the synchronizing member 5 moves from the first position to the second position or the synchronizing member 5 is kept at the second position.

Thus, the movement of the synchronizing member 5 from the first position to the second position is facilitated by the return elastic member 7, and the closing of the plurality of bottom valves 4 is achieved.

Optionally, the base valve assembly further comprises a fastening member 8, the fastening member 8 is connected with the bottom of the middle cylinder 2, and the synchronizing member 5 is movably sleeved on the fastening member 8 in the up-down direction. The reset elastic part 7 is a reset spring, the reset spring is sleeved on the fastener 8, the lower end of the reset spring is abutted against the synchronizing part 5, and the upper end of the reset spring is abutted against the bottom of the middle cylinder 2.

For example, as shown in fig. 4 and 5, the fastening member 8 is a bolt, an upper section of the bolt is screwed with the bottom of the middle cylinder 2, and the synchronizing plate 501 has a through hole, and a hole wall of the through hole is movably fitted over the fastening member 8 in the up-down direction. The lower end of the reset spring is abutted against the upper end face of the synchronous piece 5, and the upper end of the reset spring is abutted against the bottom of the middle cylinder 2.

From this, when installing elastic component 7 and synchronous piece 5 that resets in the bottom of well jar 2, directly will reset elastic component 7 and synchronous board 501 cover and establish on fastener 8, later with fastener 8 with well jar 2 bottom link to each other can, conveniently reset the installation of elastic component 7 and synchronous piece 5, be favorable to improving the packaging efficiency of two flexible stands 100.

As shown in fig. 3, the synchronizing plate 501 has a synchronizing plate passage 502 through which emulsion passes so as not to block the bottom of the middle cylinder 2 by the synchronizing plate 501. Of course, in other embodiments, the edge of the synchronizing plate 501 and the bottom of the middle cylinder 2 may be spaced in the inside-outside direction, so that the emulsion may enter and exit through the space between the edge of the synchronizing plate 501 and the bottom of the middle cylinder 2.

Optionally, the fastening members 8 and the return springs are provided in plurality, the return springs and the fastening members 8 are in one-to-one correspondence, the return springs are sleeved on the corresponding fastening members 8, and the fastening members are arranged at intervals along the circumferential direction of the middle cylinder 2.

For example, as shown in fig. 5, three fastening members 8 are provided, three through holes are provided on the synchronization plate 501, the three through holes correspond to the three fastening members 8 one by one, and hole walls of the three through holes are movably sleeved on the corresponding fastening members 8 in the up-down direction.

Therefore, the circumferential limitation of the synchronizing piece 5 can be realized by utilizing the plurality of fastening pieces 8, and the structure of the double telescopic vertical column 100 is simplified.

Of course, in other embodiments, only one fastener may be provided, with a rotation stop arrangement provided between the synchronizing member and the central cylinder. For example, the middle cylinder is provided with a jack extending in the vertical direction, the synchronizing member is provided with an insert column extending in the vertical direction, and the insert column is inserted into the jack to realize circumferential limit of the synchronizing member 5, wherein the jack is a blind hole.

Alternatively, the bottom of the middle cylinder 2 has a groove 203 with a downward opening, a part of the fastener 8 is located in the groove 203, and the return spring 7 is located between a part of the fastener 8 and a groove side wall of the groove 203 in the inward and outward direction.

Inward refers to a direction adjacent to the axis of the middle cylinder 2 on a plane perpendicular to the axial direction of the middle cylinder 2, and outward refers to a direction away from the axis of the middle cylinder 2 on a plane perpendicular to the axis of the outer cylinder 1, wherein the inward and outward directions are as shown in fig. 5.

For example, as shown in fig. 4, the groove side wall of the groove 203 serves as a spring housing, so that the return spring is limited in the inward and outward directions, the return spring is prevented from being twisted to affect normal use, and the reliability of the dual telescopic pillar 100 is improved.

Alternatively, as shown in fig. 2, one end of the second passage 102 is provided on the outer side surface of the outer cylinder 1, and the other end of the second passage 102 communicates with the outer cylinder upper chamber 202.

Optionally, the double telescopic column 100 comprises a first joint 9, the first joint 9 being provided on the outer cylinder 1, the first joint 9 being in communication with the second channel 102.

When the emulsion is passed to the outer cylinder upper chamber 202 using the second passage 102, the pipe for the emulsion to enter may be connected to the first joint 9, thereby passing the emulsion to the outer cylinder upper chamber 202 through the first joint 9 and the second passage 102.

Alternatively, as shown in fig. 2 and 3, the plunger 3 has a plunger head protruding out of the middle cylinder 2, and a third channel 303 is provided on the plunger head. The plunger 3 is provided with a plunger cavity 304 and a fourth channel 305, one end of a third channel 303 is arranged on the outer side surface of the plunger head, and the other end of the third channel 303 is communicated with the plunger cavity 304; one end of the fourth passage 305 communicates with the plunger chamber 304, and the other end of the fourth passage 305 communicates with the middle cylinder upper chamber 302, so that the third passage 303 communicates with the middle cylinder upper chamber 302.

Optionally, the double telescopic mast 100 comprises a second joint 10, the second joint 10 being provided on a plunger head, the second joint 10 being in communication with the third channel 303.

When the emulsion is communicated by the cylinder upper chamber 302 in the third passage 303, a conduit for the emulsion can be connected to the second joint 10, thereby communicating the emulsion to the cylinder upper chamber 302 through the second joint 10 and the third passage 303.

Alternatively, the third passage 303 includes a first portion and a second portion that communicate with each other, the first portion extending in the up-down direction, the second portion extending in the inward-outward direction, the second portion having a plurality of portions, each of the plurality of portions communicating with the first portion.

The hydraulic support of the embodiment of the invention comprises the double telescopic vertical columns 100 of any one of the embodiments.

Therefore, the hydraulic support provided by the embodiment of the invention has the advantages of short support moving time, high propelling speed and the like, and can effectively improve the coal mining efficiency.

Optionally, the hydraulic support further comprises a hydraulic system, and the hydraulic system comprises a hydraulic control check valve 6, a first main liquid inlet and return pipe 16, a second main liquid inlet and return pipe 17, a first liquid inlet and return pipe 11, a second liquid inlet and return pipe 12, and a third liquid inlet and return pipe 13. The pilot operated check valve 6 includes a check valve body having a first port 601, a second port 602, a third port 603, and a fourth port 604. One end of the first main fluid inlet/outlet pipe 16 communicates with the first port 601, and one end of the second main fluid inlet/outlet pipe 17 communicates with the second port 602. One end of the first liquid inlet/return pipe 11 is communicated with the second port 602, and the other end of the first liquid inlet/return pipe 11 is communicated with the second channel 102. One end of the second liquid inlet/return pipe 12 is communicated with the third port 603, and the other end of the second liquid inlet/return pipe 12 is communicated with the third channel 303. One end of the third liquid inlet/return pipe 13 is connected to the fourth port 604, and the other end of the third liquid inlet/return pipe 13 is connected to the first passage 101. When the double telescopic columns perform a column lifting operation, the first port 601 is communicated with the fourth port 604, and the third port 603 is communicated with the second port 602.

When the double telescopic column 100 according to the embodiment of the present invention performs a column lifting operation, the emulsion enters the first main liquid inlet/return pipe 16 through the other end of the first main liquid inlet/return pipe 16. Then, the emulsion enters the third liquid inlet and return pipe 13 through the first port 601 and the fourth port 604 of the pilot operated check valve 6 in sequence. Then the emulsion enters the outer cylinder lower cavity 201 through the first channel 101 communicated with the third liquid inlet and return pipe 13, and sequentially pushes the middle cylinder 2 to drive the plunger 3 to move upwards and pushes the plunger 3 to move upwards; meanwhile, the emulsion in the outer cylinder upper chamber 202 flows out sequentially through the second channel 102, the first liquid inlet and return pipe 11 and the second liquid inlet and return main pipe 17, the emulsion in the middle cylinder upper chamber 302 flows out sequentially through the second liquid inlet and return pipe 12, the third port 603 of the hydraulic control one-way valve 6, the second port 602 of the hydraulic control one-way valve 6 and the second liquid inlet and return main pipe 17, and the column lifting operation is finally completed.

Therefore, the hydraulic system is arranged, so that the lifting operation of the double telescopic vertical columns 100 is conveniently controlled and realized.

Optionally, the check valve body further has a fifth port 605, and the hydraulic system further includes a liquid return pipe 14, and one end of the liquid return pipe 14 is communicated with the fifth port 605. When the double telescopic columns perform column descending operation, the second port 602 is communicated with the third port 603, and the fourth port 604 is communicated with each of the first port 601 and the fifth port 605.

When the double telescopic column 100 of the embodiment of the present invention performs the column lowering operation, the emulsion enters the second liquid inlet/return main pipe 17 through the other end of the second liquid inlet/return main pipe 17. Then, a part of the emulsion in the second main liquid inlet and return pipe 17 sequentially enters the outer cylinder upper chamber 202 through the second port 602, the first liquid inlet and return pipe 11 and the second channel 102 of the pilot-controlled check valve 6, and another part of the emulsion in the second main liquid inlet and return pipe 17 sequentially enters the middle cylinder upper chamber 302 through the second port 602, the third port 603, the second liquid inlet and return pipe 12 and the third channel 303 of the pilot-controlled check valve 6. Then, the emulsion in the upper cavity 202 of the outer cylinder pushes the middle cylinder 2 to move downwards, and then the emulsion in the upper cavity 202 of the outer cylinder pushes the plunger 3 to move downwards; meanwhile, a part of the emulsion in the outer cylinder lower cavity 201 sequentially flows out through the first passage 101, the third liquid inlet/return pipe 13, the fourth port 604 of the hydraulic control one-way valve 6 and the first liquid inlet/return main pipe 16, and the other part of the emulsion in the outer cylinder lower cavity 201 and the middle cylinder lower cavity 301 sequentially flows out through the first passage 101, the third liquid inlet/return pipe 13, the fourth port 604 of the hydraulic control one-way valve 6, the fifth port 605 and the liquid return pipe 14, so that the column descending operation is finally completed.

That is, when the dual telescopic vertical column 100 is used for column descending operation, the emulsions in the outer cylinder lower cavity 201 and the middle cylinder lower cavity 301 can flow out through the first liquid inlet and return main pipe 16 and the liquid return pipe 14, so that the emulsions in the outer cylinder lower cavity 201 and the middle cylinder lower cavity 301 can flow out of the dual telescopic vertical column 100 quickly, thereby realizing the rapid column descending of the dual telescopic vertical column 100 and being beneficial to further improving the column descending speed.

Optionally, the pilot-controlled check valve 6 includes a first check valve plug 607, a second check valve plug 608, and a third check valve plug 609, the first check valve plug 607, the second check valve plug 608, and the third check valve plug 609 are all disposed in the check valve body, and the on-off relationship among the first port, the second port, the third port, the fourth port, and the fifth port is realized by controlling the first check valve plug 607, the second check valve plug 608, and the third check valve plug 609.

Optionally, the hydraulic system further includes a solenoid valve 15, the solenoid valve 15 has a first liquid inlet and return port and a second liquid inlet and return port, the other end of the first liquid inlet and return main pipe 16 is communicated with the first liquid inlet and return port, and the other end of the second liquid inlet and return main pipe 17 is communicated with the second liquid inlet and return port.

During the column lifting operation, the electromagnetic valve 15 is controlled to make the emulsion enter the first main liquid inlet/return pipe 16 from the first liquid inlet/return port, and the second main liquid inlet/return pipe 17 is communicated with the second liquid inlet/return port to make the emulsion in the upper chambers (including the outer cylinder upper chamber 202 and the inner cylinder upper chamber 302) flow out from the second liquid inlet/return port. When the column descending operation is performed, the electromagnetic valve 15 is controlled to make the emulsion enter the second main liquid inlet/return pipe 17 from the second liquid inlet/return port, and at the same time, the first main liquid inlet/return pipe 16 is communicated with the first liquid inlet/return port to make a part of the emulsion in the lower chamber (including the outer cylinder lower chamber 201 and the middle cylinder lower chamber 202) flow out from the first liquid inlet/return port, and make another part of the emulsion in the lower chamber (including the outer cylinder lower chamber 201 and the middle cylinder lower chamber 202) flow out through the liquid return pipe 14.

Thus, the operation of raising and lowering the column of the double telescopic column 100 is easily controlled by the solenoid valve 15.

The double-telescopic upright column 100 provided by the embodiment of the invention has the advantages of safety, reliability, quick liquid feeding and returning and the like. Through designing the bottom valve assembly with a plurality of bottom valves 4 and the hydraulic control check valve 6 with a plurality of check valve cores, on one hand, the liquid inlet and return speed of the double-telescopic stand column 100 is improved remarkably, on the other hand, the problem that the flow capacity of a single bottom valve cannot meet the speed of a large-cylinder-diameter lifting column is solved, and the flow balance between the liquid supply system of the double-telescopic stand column 100 and the liquid inlet and return system comprising a plurality of bottom valves 4 is realized. The through-flow performance of the large-cylinder-diameter double-telescopic stand column is improved, and the method has important significance for guaranteeing high-efficiency mining of a working face.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (10)

1. A dual telescoping mast, comprising:

an outer cylinder;

the middle cylinder is inserted into the outer cylinder in a sliding manner along the up-down direction, an outer cylinder lower cavity and an outer cylinder upper cavity are defined between the middle cylinder and the outer cylinder, and the outer cylinder is provided with a first channel communicated with the outer cylinder lower cavity and a second channel communicated with the outer cylinder upper cavity;

the plunger is slidably inserted into the middle cylinder along the up-down direction, a middle cylinder lower cavity and a middle cylinder upper cavity are defined between the plunger and the middle cylinder, and the plunger is provided with a third channel communicated with the middle cylinder upper cavity; and

the bottom valve assembly is arranged at the bottom of the middle cylinder and comprises a synchronizing piece and a plurality of bottom valves, the synchronizing piece is movably arranged at the bottom of the middle cylinder between a first position and a second position, the synchronizing piece located at the first position can upwards push a bottom valve spool of each of the bottom valves so as to enable the bottom valves to be opened, the synchronizing piece located at the second position leaves the bottom valve spools of the bottom valves so as to enable the bottom valves to be closed, and each of the bottom valves is a hydraulic control valve which is opened under a first preset pressure.

2. The dual telescopic column of claim 1, wherein the foot valve comprises:

a foot valve body, in which the foot valve core is arranged, an

The bulge is movably arranged at the bottom of the bottom valve body between an opening position and a closing position, the bulge positioned at the opening position can upwards push the bottom valve core to open the bottom valve, and the bulge positioned at the opening position leaves the bottom valve core so as to facilitate the closing of the bottom valve;

the synchronous piece is arranged at the lower side of the bottom valve bodies and movably arranged at the bottom of the middle cylinder along the up-down direction so as to move between the first position and the second position, and the synchronous piece is

A synchronizing plate having a passage therethrough in an up-down direction, the synchronizing member at the first position being capable of pushing the protrusion of each of the plurality of bottom valves upward to position the protrusion at the open position, the synchronizing member at the second position being spaced from the protrusion of each of the plurality of bottom valves to position the protrusion of each of the plurality of bottom valves at the closed position.

3. The dual telescopic column of claim 2, wherein the base valve assembly further comprises a return spring disposed between the central cylinder and the synchronizing member, the return spring applying a downward spring force to the synchronizing member.

4. The dual telescopic mast of claim 3, wherein the base valve assembly further comprises a fastening member, the fastening member is connected with the bottom of the middle cylinder, and the synchronizing member is movably sleeved on the fastening member in the up-down direction;

the reset elastic piece is a reset spring, the reset spring is sleeved on the fastener, the lower end of the reset spring abuts against the synchronous piece, and the upper end of the reset spring abuts against the bottom of the middle cylinder.

5. The dual telescopic column of claim 4, wherein the bottom of the middle cylinder has a recess opening downward, a portion of the fastener is located in the recess, and the return spring is located between the portion of the fastener and a slot sidewall of the recess in the inside-outside direction.

6. The double telescopic column according to any one of claims 1 to 5, wherein a plurality of the bottom valves are uniformly arranged in a circumferential direction of the middle cylinder.

7. A hydraulic mount comprising a dual telescoping mast as claimed in any one of claims 1 to 6.

8. The hydraulic mount of claim 7, further comprising a hydraulic system, the hydraulic system comprising:

the hydraulic control one-way valve comprises a one-way valve body, and the one-way valve body is provided with a first port, a second port, a third port and a fourth port;

the first liquid inlet and return main pipe and the second liquid inlet and return main pipe are arranged in the shell, one end of the first liquid inlet and return main pipe is communicated with the first port, and one end of the second liquid inlet and return main pipe is communicated with the second port;

the first liquid inlet and return pipe, the second liquid inlet and return pipe and the third liquid inlet and return pipe, one end of the first liquid inlet and return pipe is communicated with the second port, the other end of the first liquid inlet and return pipe is communicated with the second channel, one end of the second liquid inlet and return pipe is communicated with the third port, the other end of the second liquid inlet and return pipe is communicated with the third channel, one end of the third liquid inlet and return pipe is communicated with the fourth port, and the other end of the third liquid inlet and return pipe is communicated with the first channel;

when the double telescopic upright columns are used for lifting columns, the first port is communicated with the fourth port, and the third port is communicated with the second port.

9. The hydraulic mount of claim 8, wherein the check valve body further has a fifth port, the hydraulic system further comprising a fluid return tube, one end of the fluid return tube communicating with the fifth port;

wherein when the double telescopic columns are used for column descending operation, the second port is communicated with the third port, and the fourth port is communicated with each of the first port and the fifth port.

10. The hydraulic mount of claim 9, wherein the hydraulic system further comprises a solenoid valve having a first fluid inlet and return port and a second fluid inlet and return port, the other end of the first fluid inlet and return main pipe being in communication with the first fluid inlet and return port, and the other end of the second fluid inlet and return main pipe being in communication with the second fluid inlet and return port.

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