Double telescopic column and hydraulic support with same

Abstract

The application discloses a double telescopic stand column and a hydraulic support with the same. The double telescopic stand column comprises an outer cylinder, a middle cylinder, a piston rod and a bottom valve assembly. The middle cylinder is slidably inserted into the outer cylinder in the up-down direction, and the middle cylinder and the outer cylinder define an outer cylinder lower cavity and an outer cylinder upper cavity. The piston rod is slidably inserted into the middle cylinder in the up-down direction, and the piston rod and the middle cylinder define a middle cylinder lower cavity and a middle cylinder upper cavity. The bottom valve assembly is arranged at the bottom of the middle cylinder. The bottom valve assembly comprises a synchronizer and a plurality of bottom valves. The synchronizer is movably arranged at the bottom of the middle cylinder between a first position and a second position. When the synchronizer is at the first position, the synchronizer can push the valve core of each of the plurality of bottom valves upward to open the bottom valve. When the synchronizer is at the second position, the synchronizer is away from the valve core of each of the plurality of bottom valves so that the bottom valve is closed. Each of the plurality of bottom valves is a hydraulic control valve which is opened at a first preset pressure. The double telescopic stand column has the advantages of fast lifting speed and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of mining hydraulic support support, in particular to a double telescopic column and a hydraulic support having the same. Background Art

[0002] The telescopic columns are the most important working components of hydraulic supports. As mining intensity and depth continue to increase, the working resistance and support height of the telescopic columns continue to increase, and the cylinder diameter of the telescopic columns has also increased. This increase in cylinder diameter has led to slower lifting and lowering speeds, resulting in lengthy frame movement times and slow advancement, seriously impacting coal mining efficiency. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention provides a double telescopic column to increase the lifting speed of the double telescopic column.

[0005] An embodiment of the present invention provides a hydraulic support to improve coal mining efficiency.

[0006] A double telescopic column according to an embodiment of the present invention includes an outer cylinder, a middle cylinder, a piston, and a bottom valve assembly. The middle cylinder is slidably inserted into the outer cylinder in a vertical direction. The middle cylinder and the outer cylinder define an outer cylinder lower chamber and an outer cylinder upper chamber therebetween. The outer cylinder has a first passage communicating with the outer cylinder lower chamber and a second passage communicating with the outer cylinder upper chamber. The piston is slidably inserted into the middle cylinder in a vertical direction. The middle cylinder lower chamber and the middle cylinder upper chamber are defined therebetween. The piston has a third passage communicating with the middle cylinder upper chamber. The bottom valve assembly is disposed at the bottom of the middle cylinder and includes a synchronizer and a plurality of bottom valves. The synchronizer is movably disposed at the bottom of the middle cylinder between a first position and a second position. When in the first position, the synchronizer can push upward a bottom valve core of each of the plurality of bottom valves to open the bottom valve. When in the second position, the synchronizer moves away from the bottom valve core of each of the plurality of bottom valves to close the bottom valve. Each of the plurality of bottom valves is a hydraulically controlled valve that opens at a first preset pressure.

[0007] The double telescopic columns of the embodiment of the present invention have advantages such as high lifting speed.

[0008] In some embodiments, the bottom valve includes a bottom valve body and a protrusion, the bottom valve core is disposed in the bottom valve body, and the protrusion is movably disposed at the bottom of the bottom valve body between an open position and a closed position. When in the open position, the protrusion can push the bottom valve core upward to open the bottom valve, and when in the open position, the protrusion leaves the bottom valve core to close the bottom valve.

[0009] The synchronizer is provided on the lower side of the valve bodies of the plurality of bottom valves, and the synchronizer is movably provided at the bottom of the middle cylinder in the up-down direction so that the synchronizer moves between the first position and the second position. The synchronizer is a synchronizer plate, and the synchronizer plate has a channel running through in the up-down direction. The synchronizer located at the first position can push the protrusion of each of the plurality of bottom valves upward so that the protrusion of each of the plurality of bottom valves is located in the open position. The synchronizer located at the second position leaves the protrusion of each of the plurality of bottom valves so that the protrusion of each of the plurality of bottom valves is located in the closed position.

[0010] In some embodiments, the bottom valve assembly further includes a reset elastic member, which is disposed between the middle cylinder and the synchronous member and applies a downward elastic force to the synchronous member.

[0011] In some embodiments, the bottom valve assembly also includes a fastener, which is connected to the bottom of the middle cylinder, and the synchronous part is movably mounted on the fastener in the up and down directions; the reset elastic part is a reset spring, which is mounted on the fastener, and the lower end of the reset spring rests on the synchronous part, and the upper end of the reset spring rests on the bottom of the middle cylinder.

[0012] In some embodiments, the bottom of the middle cylinder has a groove with an opening facing downward, a portion of the fastener is located in the groove, and the reset elastic member is located between the portion of the fastener and the groove side wall in the inward and outward directions.

[0013] In some embodiments, the plurality of bottom valves are evenly arranged along the circumference of the middle cylinder.

[0014] The hydraulic support in the embodiment of the present invention includes the double telescopic columns described in any of the above embodiments.

[0015] The hydraulic support of the embodiment of the present invention has the advantages of short frame moving time and fast propulsion speed, and can significantly improve the coal mining speed.

[0016] In some embodiments, the hydraulic support also includes a hydraulic system, which includes a hydraulically controlled one-way valve, a first liquid inlet and return main pipe, a second liquid inlet and return main pipe, a first liquid inlet and return pipe, a second liquid inlet and return pipe and a third liquid inlet and return pipe, the hydraulically controlled one-way valve includes a one-way valve body, the one-way valve body has 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 connected to the first port, and one end of the second liquid inlet and return main pipe is connected to the second port; one end of the first liquid inlet and return pipe is connected to the second port, the other end of the first liquid inlet and return pipe is connected to the second channel, one end of the second liquid inlet and return pipe is connected to the third port, the other end of the second liquid inlet and return pipe is connected to the third channel, one end of the third liquid inlet and return pipe is connected to the fourth port, and the other end of the third liquid inlet and return pipe is connected to the first channel; when the double telescopic column performs a lifting operation, the first port is connected to the fourth port, and the third port is connected to the second port.

[0017] In some embodiments, the one-way valve body also has a fifth port, and the hydraulic system also includes a return liquid pipe, one end of which is connected to the fifth port; wherein when the double telescopic column performs a column lowering operation, the second port is connected to the third port, and the fourth port is connected to each of the first port and the fifth port.

[0018] In some embodiments, the hydraulic system further includes 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 being connected to the first liquid inlet and return port, and the other end of the second liquid inlet and return main pipe being connected to the second liquid inlet and return port. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of a double telescopic column according to an embodiment of the present invention.

[0020] Figure 2 It is a cross-sectional view of a double telescopic column according to an embodiment of the present invention.

[0021] Figure 3 It is a schematic diagram of the bottom structure of a double telescopic column according to an embodiment of the present invention.

[0022] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0023] Figure 5 yes Figure 3 Schematic diagram of the structure of the synchronizer.

[0024] Figure 6 1 is a control system diagram of a double telescopic column according to an embodiment of the present invention.

[0025] Reference numerals:

[0026] Double telescopic columns 100;

[0027] Outer cylinder 1; first channel 101; second channel 102;

[0028] Middle cylinder 2; outer cylinder lower cavity 201; outer cylinder upper cavity 202; groove 203;

[0029] Piston 3; middle cylinder lower chamber 301; middle cylinder upper chamber 302; third channel 303; piston chamber 304; fourth channel 305;

[0030] Bottom valve 4; bottom valve body 401; protrusion 402;

[0031] Synchronous member 5; Synchronous plate 501; Synchronous plate channel 502;

[0032] Hydraulic control one-way valve 6; first port 601; second port 602; third port 603; fourth port 604; fifth port 605; first one-way valve core 607; second one-way valve core 608; third one-way valve core 609;

[0033] Reset elastic member 7;

[0034] Fastener 8;

[0035] First connector 9;

[0036] Second connector 10;

[0037] First liquid inlet and return pipe 11; second liquid inlet and return pipe 12; third liquid inlet and return pipe 13; return pipe 14;

[0038] Solenoid valve 15;

[0039] The first liquid inlet and return main pipe 16;

[0040] The second liquid inlet and return main pipe 17. DETAILED DESCRIPTION

[0041] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0042] like Figures 1 to 6 As shown, the double telescopic column 100 of this embodiment of the present invention comprises an outer cylinder 1, a middle cylinder 2, a piston 3, and a bottom valve assembly. The middle cylinder 2 is slidably inserted into the outer cylinder 1 in the vertical direction, defining a lower outer cylinder chamber 201 and an upper outer cylinder chamber 202 between the middle cylinder 2 and the outer cylinder 1. The outer cylinder 1 has a first channel 101 communicating with the lower outer cylinder chamber 201 and a second channel 102 communicating with the upper outer cylinder chamber 202.

[0043] The plunger 3 is slidably inserted into the middle cylinder 2 along the vertical 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. The plunger 3 has a third channel 303 communicating with the middle cylinder upper cavity 302.

[0044] A bottom valve assembly is located at the bottom of the central cylinder 2 and includes a synchronizer 5 and a plurality of bottom valves 4. A synchronizer 5 is movably located at the bottom of the central cylinder 2 between a first position and a second position. In the first position, the synchronizer 5 pushes upward against the bottom valve core of each of the plurality of bottom valves 4 to open the bottom valve 4. In the second position, the synchronizer 5 moves away from the bottom valve core of each of the plurality of bottom valves 4 to close the bottom valve 4. Each of the plurality of bottom valves 4 is a hydraulically controlled valve that opens at a first preset pressure.

[0045] In the prior art, a single bottom valve is installed at the bottom of the middle cylinder of a double telescopic column, connecting the lower chambers of the middle and outer cylinders. As the diameter of the double telescopic cylinder increases, the flow of the emulsion is limited by the flow area of ​​the bottom valve, resulting in slow lifting and lowering speeds. This results in lengthy shifting times and slow advancement, seriously impacting coal mining efficiency.

[0046] When the double telescopic column 100 of the embodiment of the present invention performs the column lifting operation, emulsion is introduced into the outer cylinder lower chamber 201 through the first channel 101 connected to the outer cylinder lower chamber 201, and the emulsion pushes the middle cylinder 2 to drive the piston 3 to move upward. At this time, the synchronous part 5 is in the second position, and the multiple bottom valves 4 are closed; when the middle cylinder 2 moves upward to the highest position of the middle cylinder 2, it stops, and when the pressure difference between the outer cylinder lower chamber 201 and the middle cylinder lower chamber 301 is greater than or equal to the first preset pressure, at this time, the pressure difference between the lower side and the upper side of the bottom valve core of the bottom valve 4 is greater than or equal to the first preset pressure, the multiple bottom valves 4 on the lower end of the middle cylinder 2 are opened, and the emulsion enters the middle cylinder lower chamber 301 through the multiple bottom valves 4, and the emulsion pushes the piston 3 to move upward. When the piston 3 moves upward to the highest position of the piston 3, it stops, and the column lifting process of the impact-resistant double telescopic column 100 is completed.

[0047] When the double telescopic column 100 of the embodiment of the present invention is lowered, the emulsion is introduced into the upper cavity 202 of the outer cylinder through the second channel 102 connected to the upper cavity 202 of the outer cylinder. At the same time, the emulsion is introduced into the upper cavity 302 of the middle cylinder through the third channel 303 connected to the upper cavity 302 of the middle cylinder. The emulsion in the upper cavity 202 of the outer cylinder pushes the middle cylinder 2 to move downward. At this time, the synchronizer 5 is in the second position and the multiple bottom valves 4 are closed. When the middle cylinder 2 moves downward 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), it stops. At this time, the synchronous member 5 is in the first position, and the synchronous member 5 pushes the bottom valve core of each of the multiple bottom valves 4 upward, so that the pressure difference between the lower side and the upper side of the bottom valve core of the bottom valve 4 is greater than or equal to the first preset pressure, so that the multiple bottom valves 4 are opened so that the lower chamber 301 of the middle cylinder is connected with the lower chamber 201 of the outer cylinder, and the emulsion in the upper chamber 202 of the outer cylinder pushes the piston 3 to move downward. The piston 3 stops when it moves downward to the lowest position of the piston 3 (the bottom of the piston 3 rests on the bottom of the middle cylinder 2), and the lowering process of the impact-resistant double telescopic column 100 is completed.

[0048] Thus, when the double telescopic column 100 of the present embodiment is performing raising and lowering operations, the lower chamber 301 of the middle cylinder and the lower chamber 201 of the outer cylinder can be connected through multiple bottom valves 4, thereby increasing the flow rate of the emulsion and improving the flow rate of the emulsion into and out of the lower chamber 301 of the middle cylinder. This can further increase the raising and lowering speed of the double telescopic column 100, shorten the hydraulic support moving time, increase the hydraulic support propulsion speed, and improve coal mining efficiency. In addition, the provision of the synchronizer 5 ensures that multiple bottom valves 4 are opened simultaneously during the lowering operation, improving the operating stability of the double telescopic column 100.

[0049] Therefore, the double telescopic column 100 of the embodiment of the present invention has advantages such as high lifting speed.

[0050] The hydraulic support with the double telescopic columns 100 according to the embodiment of the present invention has the advantages of short moving time and high propulsion speed.

[0051] Optionally, a plurality of bottom valves 4 are evenly arranged along the circumference of the middle cylinder 2 .

[0052] In some embodiments, the bottom valve 4 includes a bottom valve body 401 and a protrusion 402. The bottom valve spool is disposed within the bottom valve body 401. The protrusion 402 is movably disposed at the bottom of the bottom valve body 401 between an open position and a closed position. When in the open position, the protrusion 402 can push the bottom valve spool upward to open the bottom valve 4. When in the open position, the protrusion 402 moves away from the bottom valve spool to close the bottom valve 4.

[0053] The synchronizer 5 is provided at the lower side of the plurality of bottom valves 4, the first position being located above the second position, and the synchronizer 5 is provided at the bottom of the middle cylinder 2 movably in the vertical direction so as to move between the first position and the second position. Figures 1 to 4 shown.

[0054] The synchronizer 5 is a synchronizer plate 501 having a vertically extending passage. When the synchronizer 5 is in a first position, it pushes upward on the protrusion 402 of each of the bottom valves 4 to open the protrusion 402. When the synchronizer 5 is in a second position, it moves away from the protrusion 402 of each of the bottom valves 4 to close the protrusion 402 of each of the bottom valves 4.

[0055] For example, Figure 3 and Figure 5 As shown, three bottom valves 4 are provided, each including a protrusion 402. When the synchronizer 5 is in the first position, it can push upward on the protrusion 402 of each of the three bottom valves 4, causing the protrusion 402 of each bottom valve 4 to be in the open position. At this point, the protrusions 402 of the three bottom valves 4 push upward on the corresponding bottom valve spool, opening all three bottom valves 4 simultaneously. When the synchronizer 5 is in the second position, it can move away from the protrusion 402 of each of the three bottom valves 4, causing the protrusion 402 of each bottom valve 4 to be in the closed position. At this point, the protrusions 402 of the three bottom valves 4 can move away from the corresponding bottom valve spool, allowing all three bottom valves 4 to be closed simultaneously. Of course, it will be understood that when the protrusion 402 moves away from the corresponding bottom valve spool, the bottom valve 4 will still open if the pressure difference between the upper and lower sides of the bottom valve spool is greater than or equal to the first preset pressure.

[0056] Therefore, the structure of the synchronizer 5 is simple and convenient to design and process.

[0057] In addition, those skilled in the art can understand that the synchronizer 5 needs to be set on the lower side of the bottom valve 4. Placing the synchronizer 5 at the bottom of the middle cylinder 2 is more convenient for disassembly and assembly of the synchronizer 5 than arranging the synchronizer at the bottom of the outer cylinder 1.

[0058] Optionally, the bottom valve assembly further includes a reset elastic member 7 , which is provided between the middle cylinder 2 and the synchronizer 5 , and applies a downward elastic force to the synchronizer 5 .

[0059] During the lifting column operation of the double telescopic column 100, the reset elastic member 7 always applies an elastic force to the synchronizer 5 to move it toward the second position, and when the pressure of the emulsion applied to the lower side of the synchronizer 5 is greater than the elastic force of the reset elastic member 7, the synchronizer 5 moves from the second position to the first position or the synchronizer 5 remains in the first position; when the pressure of the emulsion applied to the lower side of the synchronizer 5 is less than the elastic force of the reset elastic member 7, the synchronizer 5 moves from the first position to the second position or the synchronizer 5 remains in the second position.

[0060] Therefore, the resetting elastic member 7 facilitates the movement of the synchronizer 5 from the first position to the second position, thereby closing the plurality of bottom valves 4 .

[0061] Optionally, the bottom valve assembly further includes a fastener 8 connected to the bottom of the middle cylinder 2, and the synchronizer 5 is movably mounted on the fastener 8 in the vertical direction. The return elastic member 7 is a return spring, which is mounted on the fastener 8, with the lower end of the return spring abutting against the synchronizer 5 and the upper end of the return spring abutting against the bottom of the middle cylinder 2.

[0062] For example, Figure 4 and Figure 5 As shown, the fastener 8 is a bolt, the upper end of which is threadedly connected to the bottom of the middle cylinder 2. The synchronizing plate 501 has a through hole, the wall of which is movably mounted on the fastener 8 in the vertical direction. The lower end of the return spring abuts against the upper end surface of the synchronizing member 5, and the upper end of the return spring abuts against the bottom of the middle cylinder 2.

[0063] Therefore, when installing the reset elastic member 7 and the synchronization member 5 on the bottom of the middle cylinder 2, the reset elastic member 7 and the synchronization plate 501 are directly sleeved on the fastener 8, and then the fastener 8 is connected to the bottom of the middle cylinder 2, which facilitates the installation of the reset elastic member 7 and the synchronization member 5 and is beneficial to improving the assembly efficiency of the double telescopic column 100.

[0064] like Figure 3 As shown, the synchronizing plate 501 has a synchronizing plate channel 502 for the emulsion to pass through, so as to prevent the synchronizing plate 501 from blocking the bottom of the middle cylinder 2. Of course, in other embodiments, the edge of the synchronizing plate 501 and the bottom of the middle cylinder 2 may be spaced apart in the inner and outer directions, so that the emulsion can enter and exit through the gap between the edge of the synchronizing plate 501 and the bottom of the middle cylinder 2.

[0065] Optionally, multiple fasteners 8 and return springs are provided, multiple return springs correspond to multiple fasteners 8 one by one, the return springs are sleeved on the corresponding fasteners 8, and the multiple fasteners are arranged at intervals along the circumference of the middle cylinder 2.

[0066] For example, Figure 5 As shown, three fasteners 8 are provided, and three through-holes are provided on the synchronization plate 501. The three through-holes correspond to the three fasteners 8 one by one, and the hole walls of the three through-holes are movably sleeved on the corresponding fasteners 8 along the up and down directions.

[0067] Therefore, the circumferential limitation of the synchronizer 5 can be achieved by using a plurality of fasteners 8 , which is beneficial to simplifying the structure of the double telescopic column 100 .

[0068] Of course, in other embodiments, only one fastener may be provided, and a rotation-stopping structure may be provided between the synchronizer and the middle cylinder. For example, a vertically extending socket may be provided on the middle cylinder, and a vertically extending post may be provided on the synchronizer. The post is inserted into the socket to achieve circumferential positioning of the synchronizer 5, wherein the socket is a blind hole.

[0069] Optionally, the bottom of the middle cylinder 2 has a groove 203 with an opening facing downward, a portion of the fastener 8 is located in the groove 203, and the reset elastic member 7 is located between a portion of the fastener 8 and the groove side wall of the groove 203 in the inward and outward directions.

[0070] Inward refers to the 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 the direction away from the axis of the middle cylinder 2 on a plane perpendicular to the axis of the outer cylinder 1. Figure 5 shown.

[0071] For example, Figure 4 As shown, the side wall of the groove 203 is used as a spring cylinder, thereby limiting the return spring in the inward and outward directions, preventing the return spring from twisting and affecting normal use, which is beneficial to improving the reliability of the double telescopic column 100.

[0072] Alternatively, as Figure 2 As shown, one end of the second channel 102 is provided on the outer surface of the outer cylinder 1 , and the other end of the second channel 102 is communicated with the upper cavity 202 of the outer cylinder.

[0073] Optionally, the double telescopic column 100 includes a first joint 9 , which is provided on the outer cylinder 1 and communicates with the second channel 102 .

[0074] When the emulsion is passed to the outer cylinder upper chamber 202 via the second channel 102 , the pipe for the emulsion to enter can be connected to the first joint 9 , thereby passing the emulsion to the outer cylinder upper chamber 202 via the first joint 9 and the second channel 102 .

[0075] Alternatively, as Figure 2 and Figure 3 As shown, the piston 3 has a piston head extending out of the middle cylinder 2, and a third channel 303 is provided on the piston head. The piston 3 has a piston cavity 304 and a fourth channel 305. One end of the third channel 303 is provided on the outer surface of the piston head, and the other end of the third channel 303 is connected to the piston cavity 304. One end of the fourth channel 305 is connected to the piston cavity 304, and the other end of the fourth channel 305 is connected to the middle cylinder upper cavity 302, thereby connecting the third channel 303 with the middle cylinder upper cavity 302.

[0076] Optionally, the double telescopic column 100 includes a second joint 10 , which is provided on the movable column head and communicates with the third channel 303 .

[0077] When the emulsion is passed through the upper chamber 302 of the cylinder via the third channel 303 , the pipe for the emulsion to enter can be connected to the second joint 10 , thereby passing the emulsion to the upper chamber 302 of the cylinder via the second joint 10 and the third channel 303 .

[0078] Optionally, the third channel 303 includes a first part and a second part that are connected, the first part extends in the up-down direction, the second part extends in the inside-outside direction, there are multiple second parts, and the multiple second parts are all connected to the first part.

[0079] The hydraulic support according to the embodiment of the present invention includes the double telescopic columns 100 described in any one of the above embodiments.

[0080] Therefore, the hydraulic support according to the embodiment of the present invention has the advantages of short frame moving time and fast propulsion speed, and can effectively improve the efficiency of coal mining.

[0081] Optionally, the hydraulic support further includes a hydraulic system comprising a hydraulically controlled one-way 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 hydraulically controlled one-way valve 6 includes a one-way 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 liquid inlet and return pipe 16 is connected to the first port 601, and one end of the second main liquid inlet and return pipe 17 is connected to the second port 602. One end of the first liquid inlet and return pipe 11 is connected to the second port 602, and the other end of the first liquid inlet and return pipe 11 is connected to the second channel 102. One end of the second liquid inlet and return pipe 12 is connected to the third port 603, and the other end of the second liquid inlet and return pipe 12 is connected to the third channel 303. One end of the third liquid inlet and return pipe 13 is connected to the fourth port 604, and the other end of the third liquid inlet and return pipe 13 is connected to the first channel 101. When the double telescopic columns are performing a column raising operation, the first port 601 is connected to the fourth port 604 , and the third port 603 is connected to the second port 602 .

[0082] During the raising operation of the double telescopic column 100 according to the embodiment of the present invention, emulsion enters the first main inlet and return pipe 16 through the other end of the first main inlet and return pipe 16. The emulsion then flows sequentially through the first port 601 and the fourth port 604 of the hydraulically controlled one-way valve 6 into the third inlet and return pipe 13. The emulsion then enters the outer cylinder lower chamber 201 through the first channel 101, which is connected to the third inlet and return pipe 13. This in turn pushes the middle cylinder 2 upward, driving the plunger 3 upward. Simultaneously, the emulsion in the outer cylinder upper chamber 202 flows out through the second channel 102, the first inlet and return pipe 11, and the second main inlet and return pipe 17. The emulsion in the middle cylinder upper chamber 302 flows out through the second inlet and return pipe 12, the third port 603 of the hydraulically controlled one-way valve 6, the second port 602 of the hydraulically controlled one-way valve 6, and the second inlet and return pipe 17, ultimately completing the raising operation.

[0083] Therefore, through the above-mentioned setting of the hydraulic system, the lifting operation of the double telescopic column 100 can be conveniently controlled.

[0084] Optionally, the one-way valve body further has a fifth port 605, and the hydraulic system further includes a liquid return pipe 14, one end of which is connected to the fifth port 605. When the double telescopic column is lowering, the second port 602 is connected to the third port 603, and the fourth port 604 is connected to each of the first port 601 and the fifth port 605.

[0085] When the double telescopic column 100 of the embodiment of the present invention is lowered, the emulsion enters the second liquid inlet and return main pipe 17 through the other end of the second liquid inlet and return main pipe 17. Then, a portion of the emulsion in the second liquid inlet and return main pipe 17 enters the outer cylinder upper chamber 202 in sequence through the second port 602 of the hydraulically controlled one-way valve 6, the first liquid inlet and return pipe 11, and the second channel 102. Another portion of the emulsion in the second liquid inlet and return main pipe 17 enters the middle cylinder upper chamber 302 in sequence through the second port 602, the third port 603 of the hydraulically controlled one-way valve 6, the second liquid inlet and return pipe 12, and the third channel 303. Afterwards, the emulsion in the upper chamber 202 of the outer cylinder first pushes the middle cylinder 2 to move downward, and the emulsion in the upper chamber 202 of the outer cylinder then pushes the piston 3 to move downward; at the same time, a part of the emulsion in the lower chamber 201 of the outer cylinder flows out through the first channel 101, the third liquid inlet and return pipe 13, the fourth port 604 of the hydraulically controlled one-way valve 6 and the first liquid inlet and return main pipe 16 in sequence, and the other part of the emulsion in the lower chamber 201 of the outer cylinder and the lower chamber 301 of the middle cylinder flows out through the first channel 101, the third liquid inlet and return pipe 13, the fourth port 604, the fifth port 605 and the return pipe 14 in sequence, finally completing the column lowering operation.

[0086] That is, when the double telescopic column 100 is lowering, the emulsion in the outer cylinder lower chamber 201 and the middle cylinder lower chamber 301 can flow out through the first liquid inlet and return main pipe 16 and the liquid return pipe 14 respectively, so that the emulsion in the outer cylinder lower chamber 201 and the middle cylinder lower chamber 301 can quickly flow out of the double telescopic column 100, thereby realizing rapid lowering of the double telescopic column 100, which is conducive to further improving the column lowering speed.

[0087] Optionally, the hydraulically controlled one-way valve 6 includes a first one-way valve core 607, a second one-way valve core 608 and a third one-way valve core 609. The first one-way valve core 607, the second one-way valve core 608 and the third one-way valve core 609 are all arranged in the one-way valve body. The on-off relationship between the first port, the second port, the third port, the fourth port and the fifth port is realized by controlling the first one-way valve core 607, the second one-way valve core 608 and the third one-way valve core 609.

[0088] Optionally, the hydraulic system further includes a solenoid valve 15 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 16 is connected to the first liquid inlet and return port, and the other end of the second liquid inlet and return main pipe 17 is connected to the second liquid inlet and return port.

[0089] When performing a column raising operation, the solenoid valve 15 can be controlled to allow the emulsion to enter the first liquid inlet and return main pipe 16 from the first liquid inlet and return port, while the second liquid inlet and return main pipe 17 is connected to the second liquid inlet and return port, allowing the emulsion in the upper chamber (including the outer cylinder upper chamber 202 and the middle cylinder upper chamber 302) to flow out from the second liquid inlet and return port. When performing a column lowering operation, the solenoid valve 15 can be controlled to allow the emulsion to enter the second liquid inlet and return main pipe 17 from the second liquid inlet and return port, while the first liquid inlet and return main pipe 16 is connected to the first liquid inlet and return port, allowing a portion of the emulsion in the lower chamber (including the outer cylinder lower chamber 201 and the middle cylinder lower chamber 202) to flow out from the first liquid inlet and return port, while the other portion of the emulsion in the lower chamber (including the outer cylinder lower chamber 201 and the middle cylinder lower chamber 202) to flow out through the liquid return pipe 14.

[0090] Therefore, the solenoid valve 15 is used to conveniently control the raising and lowering operations of the double telescopic column 100 .

[0091] The dual telescopic column 100 of the present invention offers advantages such as safety, reliability, and rapid liquid supply and return. By designing a bottom valve assembly with multiple bottom valves 4 and a hydraulically controlled check valve 6 with multiple one-way valve cores, the dual telescopic column 100 significantly improves its liquid supply and return speeds. Furthermore, it addresses the issue of a single bottom valve's insufficient flow capacity to meet the speed requirements of a large-diameter lifting column. Furthermore, it achieves flow balance between the dual telescopic column 100's liquid supply system and the liquid supply and return system, which includes multiple bottom valves 4. This improved flow performance of the large-diameter dual telescopic column is crucial for ensuring efficient mining operations at the working face.

[0092] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0093] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. 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, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0094] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0095] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0096] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0097] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A double telescopic column, characterized in that: include: outer cylinder; a middle cylinder, the middle cylinder being slidably inserted into the outer cylinder in the up-down direction, the middle cylinder and the outer cylinder defining an outer cylinder lower cavity and an outer cylinder upper cavity therebetween, wherein the outer cylinder has a first passage communicating with the outer cylinder lower cavity and a second passage communicating with the outer cylinder upper cavity; a piston, the piston being slidably inserted into the middle cylinder in an up-down direction, the piston defining a middle cylinder lower cavity and a middle cylinder upper cavity between the piston and the middle cylinder, the piston having a third passage communicating with the middle cylinder upper cavity; and a bottom valve assembly, the bottom valve assembly being disposed at the bottom of the middle cylinder, the bottom valve assembly comprising a synchronizer and a plurality of bottom valves, the synchronizer being movably disposed at the bottom of the middle cylinder between a first position and a second position, the synchronizer being capable of pushing upward a bottom valve core of each of the plurality of bottom valves to open the bottom valve when in the first position, and the synchronizer being capable of moving away from the bottom valve core of each of the plurality of bottom valves to close the bottom valve when in the second position, each of the plurality of bottom valves being a hydraulically controlled valve that opens at a first preset pressure; The bottom valve comprises: A bottom valve body, wherein the bottom valve core is arranged in the bottom valve body, and a protrusion, the protrusion being movably disposed on the bottom of the bottom valve body between an open position and a closed position, wherein the protrusion in the open position can push the bottom valve core upward to open the bottom valve, and the protrusion in the open position moves away from the bottom valve core to close the bottom valve; The synchronizer is provided on the lower side of the plurality of bottom valve bodies, and is movably provided at the bottom of the middle cylinder in the up-down direction so that the synchronizer can move between the first position and the second position. A synchronization plate having a channel extending in the up-down direction, wherein the synchronization member located at the first position can push the protrusion of each of the plurality of bottom valves upward so that the protrusion is located in the open position, and the synchronization member located at the second position leaves the protrusion of each of the plurality of bottom valves so that the protrusion of each of the plurality of bottom valves is located in the closed position.

2. The double telescopic column according to claim 1, characterized in that: The bottom valve assembly further includes a reset elastic member, which is disposed between the middle cylinder and the synchronous member and applies a downward elastic force to the synchronous member.

3. The double telescopic column according to claim 2, characterized in that: The bottom valve assembly further includes a fastener connected to the bottom of the middle cylinder, and the synchronizer is movably sleeved on the fastener in the up-down direction; The reset elastic member is a reset spring, which is sleeved on the fastener. The lower end of the reset spring abuts against the synchronizer, and the upper end of the reset spring abuts against the bottom of the middle cylinder.

4. The double telescopic column according to claim 3, characterized in that: The bottom of the middle cylinder has a groove with an opening facing downward, a portion of the fastener is located in the groove, and the reset elastic member is located between the portion of the fastener and the groove side wall of the groove in the inward and outward directions.

5. The double telescopic column according to any one of claims 1 to 4, characterized in that: The plurality of bottom valves are evenly arranged along the circumference of the middle cylinder.

6. A hydraulic support, characterized in that: The invention comprises the double telescopic column according to any one of claims 1 to 5.

7. The hydraulic support according to claim 6, characterized in that: Also included is a hydraulic system, the hydraulic system comprising: A hydraulically controlled one-way valve, the hydraulically controlled one-way valve comprising a one-way valve body having a first port, a second port, a third port, and a fourth port; a first liquid inlet and return main pipe and a second liquid inlet and return main pipe, wherein one end of the first liquid inlet and return main pipe is connected to the first port, and one end of the second liquid inlet and return main pipe is connected to the second port; a first liquid inlet and return pipe, a second liquid inlet and return pipe, and a third liquid inlet and return pipe, wherein one end of the first liquid inlet and return pipe is connected to the second port, the other end of the first liquid inlet and return pipe is connected to the second channel, one end of the second liquid inlet and return pipe is connected to the third port, the other end of the second liquid inlet and return pipe is connected to the third channel, one end of the third liquid inlet and return pipe is connected to the fourth port, and the other end of the third liquid inlet and return pipe is connected to the first channel; When the double telescopic column performs a column raising operation, the first port is connected to the fourth port, and the third port is connected to the second port.

8. The hydraulic support according to claim 7, characterized in that: The one-way valve body further has a fifth port, and the hydraulic system further includes a liquid return pipe, one end of which is connected to the fifth port; When the double telescopic column performs a column lowering 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.

9. The hydraulic support according to claim 8, characterized in that: The hydraulic system further includes 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 connected to the first liquid inlet and return port, and the other end of the second liquid inlet and return main pipe is connected to the second liquid inlet and return port.

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