Double-telescopic stand column with supercharging device and hydraulic support

Abstract

The invention relates to the technical field of hydraulic supports, in particular to a double-telescopic stand column with a supercharging device and a hydraulic support, and the double-telescopic stand column comprises a first cylinder body, a second cylinder body and the supercharging device; the supercharging device comprises a movable column which is movably arranged in the second cylinder body, and a supercharging connector is formed at one end of the movable column; the piston assembly is movably arranged in the plunger; and after pressurizing liquid is introduced into the pressurizing interface, the piston assembly is pushed to move. According to the double-telescopic stand column with the supercharging device and the hydraulic support, the supercharging device is designed in a built-in mode, extra space is not needed, the supercharging device and the telescopic stand column can be integrally assembled, extra pipelines and control valves do not need to be arranged, the oil way design is simplified, and the manufacturing cost is reduced; by inputting the pressurizing liquid, the piston assembly is driven to move, the pressurizing liquid is input into the second cylinder body and / or the liquid space in the second cylinder body is compressed, and therefore the pressurizing effect on the double-telescopic stand column is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic supports, and in particular to a double telescopic column with a pressure boosting device and a hydraulic support. Background Art

[0002] The active initial support force of the hydraulic support can improve the support's ability to manage the roof, improve the support's support effect, reduce the amount of column drop from the active initial support to the constant resistance stage, and reduce the amount of roof settlement before and after the frame is moved. However, due to the lengthy industrial pipelines in the comprehensive mining working face, when the emulsion reaches the liquid support through the liquid supply pipeline, considering the opening pressure of the one-way valve and the throttling pressure loss, the actual pressure reaching the column is lower than the liquid supply pressure, which seriously reduces the active initial support force of the support. Therefore, in order to increase the initial support force of the hydraulic support, it is generally necessary to equip it with a booster device. In the prior art, an external booster device is generally used, which requires a booster cylinder or a booster, encroaching on the space of the hydraulic support, resulting in a large occupied area; the prior art pipelines and control valves are complexly arranged, and the existing hydraulic system circuits are modified a lot, which is costly. Summary of the invention

[0003] The present invention provides a double telescopic column and a hydraulic support with a booster device, which are used to solve the problems in the prior art that the external booster device occupies the space of the hydraulic support, resulting in a large occupied area, and the defects of complex pipeline and control valve layout, many modifications and high cost.

[0004] The present invention provides a double telescopic column with a supercharging device, comprising: a first cylinder body, a second cylinder body and a supercharging device; the second cylinder body is movably arranged in the first cylinder body; the supercharging device comprises: A piston is movably disposed in the second cylinder body, and a pressurizing interface is formed at one end of the piston for introducing pressurized liquid; A piston assembly is movably disposed in the piston, and one end of the piston assembly is disposed close to the boost interface; When the pressurized liquid is introduced into the pressurizing interface, the piston assembly is pushed to move in the direction of extending into the second cylinder, thereby inputting the pressurized liquid into the second cylinder and / or compressing the liquid space in the second cylinder.

[0005] According to the double telescopic column with a pressure boosting device provided by the present invention, the pressure boosting device further comprises: a cylinder barrel, fixed in the piston and formed with a liquid discharge passage, one end of which is in communication with the second cylinder body; The piston assembly comprises: a double-headed piston, which is movably arranged in the piston, and one end of which is arranged close to the boost interface, and the other end of which is movably arranged in the cylinder, and an annular chamber for containing liquid is formed between the double-headed piston and the piston, and the annular chamber is communicated with the other end of the discharge channel; A cavity is formed inside the cylinder, and the other end of the double-headed piston is inserted into the cavity and sealed to form a first gas chamber. A first inflation valve is provided in the cylinder for filling the first gas chamber with inert gas.

[0006] According to the double telescopic column with a pressure boosting device provided by the present invention, the pressure boosting device further comprises: A first screw plug is provided at one end of the cylinder barrel and is used to block the first gas chamber from the liquid inside the second cylinder; The first sealing member is sealingly disposed between the first screw plug and the cylinder tube.

[0007] According to the double telescopic column with a pressure boosting device provided by the present invention, a first assembly groove is formed on the outer wall of one end of the double-headed piston, and a second assembly groove is formed on the outer wall of the other end, and the pressure boosting device further includes: A first guide ring, sealingly disposed between the first assembly groove and the piston; The second guide ring is sealed and arranged between the second assembly groove and the cylinder barrel.

[0008] According to the double telescopic column with a pressure boosting device provided by the present invention, a third assembly groove is formed on the outer wall of one end of the double-headed piston, and a fourth assembly groove is formed on the outer wall of the other end, and the pressure boosting device further includes: A second sealing member, sealingly disposed between the third assembly groove and the piston; The third sealing member is sealingly arranged between the fourth assembly groove and the cylinder barrel.

[0009] According to the double telescopic column with a pressure boosting device provided by the present invention, the pressure boosting device further comprises: A guide sleeve, fixed to an end of the piston away from the boost interface; The piston assembly comprises: A piston rod is movably disposed in the piston column, and one end of the piston rod is disposed near the boost interface, and the other end of the piston rod is movably disposed in the guide sleeve and can extend into the second cylinder body. A cavity is formed inside the piston rod and is connected with a chamber formed between the piston rod and the piston column to form a second gas chamber. A second inflation valve is provided at one end of the piston rod for filling the second gas chamber with inert gas; The piston head is fixed to one end of the piston rod close to the boost interface.

[0010] According to the double telescopic column with a pressure boosting device provided by the present invention, the pressure boosting device further comprises: A second screw plug is provided at one end of the guide sleeve and is used to block the liquid in the second gas chamber and the second cylinder; The fourth sealing member is sealingly disposed between the second screw plug and the guide sleeve.

[0011] According to the double telescopic column with a pressure boosting device provided by the present invention, a fifth assembly groove is formed on the outer wall of the piston head, a sixth assembly groove is formed on the outer wall of the piston rod away from the end of the piston head, and the pressure boosting device further comprises: a third guide ring, sealingly disposed between the fifth assembly groove and the plunger; The fourth guide ring is sealed between the sixth assembly groove and the guide sleeve.

[0012] According to the double telescopic column with a pressure boosting device provided by the present invention, a seventh assembly groove is formed on the outer wall of the piston head, an eighth assembly groove is formed on the outer wall of the piston rod away from the end of the piston head, and the pressure boosting device further comprises: a fifth sealing member, sealingly disposed between the seventh assembly groove and the piston; A sixth sealing member is sealingly disposed between the eighth assembly groove and the guide sleeve.

[0013] According to the double telescopic column with a pressure boosting device provided by the present invention, a ninth assembly groove is formed on the outer wall of the guide sleeve, and the pressure boosting device further comprises: A seventh sealing member is sealingly disposed between the ninth assembly groove and the piston.

[0014] According to the double telescopic column with a pressure boosting device provided by the present invention, the pressure boosting device further comprises: The buffer sleeve is sleeved on one end of the piston assembly close to the boost interface, and the end of the buffer sleeve close to the boost interface is formed with a conical structure.

[0015] The present invention further provides a hydraulic support, comprising: the double telescopic columns with a pressure boosting device in the above embodiment of the present invention.

[0016] The present invention provides a double telescopic column with a supercharging device, comprising: a first cylinder, a second cylinder and a supercharging device; the second cylinder is movably arranged in the first cylinder. The supercharging device comprises: a piston and a piston assembly. The piston is movably arranged in the second cylinder, and a supercharging interface is formed at one end of the piston for introducing a supercharging liquid; the piston assembly is movably arranged in the piston, and one end is arranged near the supercharging interface. When the supercharging interface introduces the supercharging liquid, the piston assembly is pushed to move in the direction of extending into the second cylinder, and the supercharging liquid is input into the second cylinder and / or the liquid space in the second cylinder is compressed. The double telescopic column with a supercharging device provided by the present invention adopts a built-in design of the supercharging device, which, on the one hand, does not require additional space and can be integrated with the telescopic column, and on the other hand, does not require additional pipelines and control valves, simplifies the oil circuit design, and reduces the cost; by inputting the supercharging liquid, the piston assembly is driven to move, and the supercharging liquid is input into the second cylinder and / or the liquid space in the second cylinder is compressed, thereby achieving the supercharging effect of the double telescopic column. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the structure of the boosting device provided in Example 1 of the present invention.

[0019] Figure 2 It is a schematic structural diagram of a double telescopic column with a pressurizing device provided in Example 1 of the present invention.

[0020] Figure 3 It is a schematic structural diagram of the boosting device provided in Example 1 of the present invention when it is in the first working state.

[0021] Figure 4 It is a schematic structural diagram of the boosting device provided in Example 1 of the present invention when it is in the second working state.

[0022] Figure 5 It is a schematic diagram of the structure of the boosting device provided in Example 2 of the present invention.

[0023] Figure 6 It is a schematic structural diagram of a double telescopic column with a pressurizing device provided in Example 2 of the present invention.

[0024] Figure 7 It is a schematic structural diagram of the boosting device provided in Example 2 of the present invention when it is in the first working state.

[0025] Figure 8 It is a structural schematic diagram of the boosting device provided in Example 2 of the present invention when it is in the second working state.

[0026] Reference numerals: 101, first cylinder; 102, second cylinder; 103, lower chamber liquid inlet joint seat; 104, booster device; 105, upper chamber liquid inlet joint seat; 106, second cylinder guide sleeve; 107, piston guide sleeve; 108, boost control liquid joint; 109, bottom valve; 110, plug; 111, heavy-duty retaining ring; 121, second cylinder piston seal pack; 141, piston piston seal pack; 161, second cylinder guide sleeve seal pack; 162, piston guide sleeve seal pack; 1. First screw plug; 2. circlip; 3. First charging valve; 4. Cylinder; 5. Piston; 6. Double-headed piston; 7. Buffer sleeve; 8. Shaft retaining ring; 9. Eighth sealing member; 10. First guide ring; 11. Second sealing member; 12. Second guide ring; 13. Third sealing member; 14. First gas seal; 15. First sealing member; 16. Pressurization interface; 17. Drain channel; 18. Annular chamber; 19. First gas chamber; 21. Second screw plug; 22. Second inflation valve; 23. Guide sleeve; 24. Piston rod; 25. Piston head; 26. Second gas chamber; 27. Fourth sealing member; 28. Third guide ring; 29. ​​Fourth guide ring; 30. Y-ring; 31. Piston rod combined seal; 32. Piston combined seal; 33. Second gas seal; 34. O-ring with retaining ring; 35. Y-ring with retaining ring. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In the description of the present embodiment, 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 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 embodiment and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present embodiment.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this embodiment, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In this embodiment, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0031] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0032] Combine the following Figure 1-Figure 8 The present invention describes a double telescopic column with a pressure boosting device. The double telescopic column with a pressure boosting device comprises: a first cylinder 101, a second cylinder 102 and a pressure boosting device 104; the second cylinder 102 is movably disposed in the first cylinder 101.

[0033] The pressure boosting device comprises a piston 5 and a piston assembly.

[0034] The piston 5 is movably disposed in the second cylinder body 102 , and a pressurizing interface 16 is formed at one end of the piston 5 for introducing pressurized liquid; the piston assembly is movably disposed in the piston 5 , and one end is disposed close to the pressurizing interface 16 .

[0035] Specifically, the piston 5 is a hollow structure, which can be extended from the second cylinder 102 under the action of liquid. The piston assembly can move inside the piston 5, and the pressurized liquid is introduced through the pressurization interface 16 to provide power for the movement of the piston assembly. The movement of the piston assembly can provide a pressurization effect for the double telescopic column, which can be through the movement of the piston assembly to transport the pressurized liquid into the second cylinder 102, and / or, through the movement of the piston assembly and extending into the second cylinder 102, the volume in the second cylinder 102 is reduced, that is, the liquid space in the second cylinder 102 is compressed. Both of the above methods can play a pressurization role, and the two methods can also be used in combination.

[0036] The supercharging process of the above supercharging device is as follows: When the pressurized liquid is introduced into the pressurization interface 16, the piston assembly is pushed to move in the direction of extending into the second cylinder 102, and the pressurized liquid is input into the second cylinder 102 and / or the liquid space in the second cylinder 102 is compressed. It can be understood that when the pressurized liquid is introduced, the piston assembly is pushed to move, and the double telescopic column can be pressurized in two ways: 1. Through the movement of the piston assembly, the pressurized liquid is transported into the second cylinder, and the double telescopic column is pressurized by increasing the liquid volume in the second cylinder; 2. Through the movement of the piston assembly, it extends into the second cylinder, and the double telescopic column is pressurized by the volume occupied by the piston assembly in the second cylinder. Of course, the above two pressurization methods can also be used in combination, that is, the pressurized liquid is transported into the second cylinder, and the piston assembly is used to extend into the second cylinder at the same time.

[0037] The above two boosting methods can both achieve internal boosting of the hydraulic support column without changing the external dimensions and strength of the hydraulic support column; they are highly integrated and do not occupy the space of the hydraulic support. By blocking the boosting fluid supply port, they can be converted to conventional columns; however, the two boosting methods have their own advantages and can be used in accordance with the actual situation: 1. The first method: (1) by delivering pressurized liquid into the second cylinder, the piston assembly itself does not extend into the second cylinder, thereby reducing contamination of the liquid and the risk of contact between the piston assembly and the second cylinder; (2) by using the ratio of the cross-sectional area of ​​the large-head piston to the cross-sectional area of ​​the small-head piston of the double-head piston of the pressurizing device, the system hydraulic pressure is amplified, and the pressure increase ratio is about 1.5; 2. The second method, (1) the piston assembly is directly extended into the second cylinder body, without the need to set up an additional discharge channel and a chamber for containing the pressurized liquid. The column modification and processing is simple, and the hydraulic system of the existing hydraulic support is slightly modified; (2) the area ratio of the piston head cross-sectional area of ​​the piston rod of the booster device to the piston rod cross-sectional area is used to amplify the system hydraulic pressure.

[0038] Specifically, the first cylinder body 101 and the second cylinder body 102 are both hollow structures, and the first cylinder body 101 and the second cylinder body 102 are nested. The booster device 104 is built inside the second cylinder body 102. On the one hand, no additional space is required and it can be integrated with the telescopic column. On the other hand, no additional pipelines and control valves are required, which simplifies the oil circuit design and reduces the cost.

[0039] It can be seen that the double telescopic column with a pressurizing device provided by the present invention adopts a built-in design of the pressurizing device. On the one hand, no additional space is required and it can be integrated with the telescopic column. On the other hand, no additional pipelines and control valves are required, which simplifies the oil circuit design and reduces the cost. By inputting pressurized liquid, the movement of the piston assembly is driven, and the pressurized liquid is input into the second cylinder and / or the liquid space in the second cylinder is compressed, thereby achieving a pressurizing effect on the double telescopic column.

[0040] In one embodiment of the present invention, the double telescopic column with a boosting device is composed of a first cylinder body 101, a second cylinder body 102, a lower chamber liquid inlet joint seat 103, a boosting device 104, an upper chamber liquid inlet joint seat 105, a second cylinder body guide sleeve 106, a piston guide sleeve 107, a boost control liquid joint 108 (connected to the boost interface 16), a bottom valve 109, a screw plug 110 and a heavy-duty retaining spring 111, a second cylinder body piston sealing package 121, a piston piston sealing package 141, a set screw, a second cylinder body guide sleeve sealing package 161 and a piston guide sleeve sealing package 162, etc.

[0041] Among them, the lower cavity liquid inlet joint seat 103, the upper cavity liquid inlet joint seat 105 and the first cylinder body 101 are welded together, the second cylinder body guide sleeve 106 is fixed on the first cylinder body 101 by a rectangular thread, and is fixed with two set screws to prevent loosening, and the second cylinder body guide sleeve sealing package 161 plays the role of guiding support, high-pressure sealing and dust prevention; the second cylinder body 102 has a liquid through hole inside, which connects the second cylinder body piston rod cavity with the piston rod cavity of the piston rod, and when the column is lowered, only the upper cavity liquid inlet joint seat 105 is used for liquid supply; the piston guide sleeve 107 is fixed on the second cylinder body 102 by a rectangular thread, and is fixed with two set screws to prevent loosening, and the piston guide sleeve sealing package 162 plays the role of guiding support, high-pressure sealing and dust prevention; the second cylinder body piston sealing package 121 plays the role of guiding support and high-pressure sealing to prevent liquid from flowing between the large cavity and the small cavity of the second cylinder body; the piston sealing package 141 plays the role of guiding support and high-pressure sealing to prevent liquid from flowing between the large cavity and the small cavity of the piston.

[0042] In one embodiment of the present invention, the boosting device 104 further includes: a buffer sleeve, which is sleeved on one end of the piston assembly close to the boosting interface, and the end of the buffer sleeve close to the boosting interface is formed with a conical structure.

[0043] The specific structure of the boosting device is described below through two embodiments.

[0044] Embodiment 1: like Figure 1 As shown, in this example, the boosting device 104 further includes: a cylinder barrel 4 which is fixed in the piston 5 and is formed with a liquid discharge channel 17 , one end of which is in communication with the second cylinder body 102 .

[0045] The piston assembly includes: a double-headed piston 6, which is movably arranged in the piston 5, and one end is arranged near the boost interface 16, and the other end is movably arranged in the cylinder 4, and an annular chamber 18 for accommodating liquid is formed between the double-headed piston 6 and the piston 5, and the annular chamber 18 is connected to the other end of the discharge channel 17.

[0046] A cavity is formed inside the cylinder 4 , and the other end of the double-headed piston 6 is inserted into the cavity and sealed to form a first gas chamber 19 . A first inflation valve 3 is provided in the cylinder for filling the first gas chamber 19 with inert gas.

[0047] Specifically, the cylinder barrel 4 and the double-headed piston 6 are both arranged inside the piston 5. Generally, in order to increase the pressure in the double telescopic column when the telescopic column is extended, the pressure-increasing interface 16 should be arranged at the end of the piston 5 away from the second cylinder body 102, and the double-headed piston 6 is pushed to move by inputting the pressurized liquid.

[0048] One end of the cylinder 4 is fixedly connected to the piston 5, and there is no relative movement between the two. The cylinder 4 is also a hollow structure to form a cavity, which is sealed with the double-headed piston 6 to form a first gas chamber 19 inside the two. An inert gas, such as nitrogen or helium, is introduced into the first gas chamber 19 through the first inflation valve 3. When the pressurized liquid pushes the double-headed piston 6 to move, it needs to overcome the gas pressure in the first gas chamber 19 at the same time; when the pressurized liquid returns, the double-headed piston 6 is reset due to the pressure of the compressed gas in the first gas chamber 19 and the liquid inside the second cylinder body 102.

[0049] The double-headed piston 6 can move in the piston 5 and the cylinder 4, with one end of the piston being placed inside the piston 5 and the other end being placed inside the cylinder 4. The double-headed piston 6 moves under the push of the pressurized liquid. The movement of the double-headed piston 6 causes the volume of the annular chamber 18 between the double-headed piston 6 and the piston 5 to change. The liquid is transported to the second cylinder body 102 through the discharge channel 17 to pressurize the double telescopic columns.

[0050] It should be understood that the double-headed piston 6 has working surfaces in both directions, that is, it has piston heads in both directions, allowing bidirectional work in one cylinder and generating forces in both directions. According to the size classification, the piston head located in the piston 5 is a large-headed piston, and the piston head located in the cylinder 4 is a small-headed piston.

[0051] The pressurization process of the pressurization device 104 of the present invention is as follows: When the pressurized liquid is introduced into the pressurizing interface 16, the double-headed piston 6 moves toward the second cylinder body 102 under the push of the pressurized liquid, so that the volume of the annular chamber 18 is compressed, and the internal liquid is transported to the second cylinder body 102 through the discharge channel 17, thereby pressurizing the double telescopic columns.

[0052] Preferably, the booster device 104 further includes: a screw plug 1 and a first seal 15. The screw plug 1 is disposed at one end of the cylinder 4 to block the first gas chamber 19 from the liquid inside the cylinder; the first seal 15 is sealed between the screw plug 1 and the cylinder 4. In this embodiment, the screw plug 1 and the first seal 15 are used to block the first gas chamber 19 in the cylinder 4 from the liquid in the cylinder, to ensure the sealing of the inert gas and the sealing of the liquid in the second cylinder 102, to avoid gas-liquid mixing and contamination of the liquid.

[0053] Preferably, the cylinder barrel 4 is connected to the piston 5 through a thread, and is fixedly connected to the piston 5 through a retaining ring 2 at one end of the cylinder barrel 4. Specifically, the piston 5 has an internal thread, and the cylinder barrel 4 has an external thread, which are connected through internal and external threads, and a retaining ring 2 is arranged at the end, so that the cylinder barrel 4 and the piston 5 are fixed. Preferably, the cylinder barrel 4 and the piston 5 are connected through a rectangular thread and fixed with a heavy retaining ring.

[0054] Preferably, a first assembly groove is formed on the outer wall of one end of the double-headed piston 6, and a second assembly groove is formed on the outer wall of the other end. The booster device 104 further includes: a first guide ring 10 and a second guide ring 12. The first guide ring 10 is sealed between the first assembly groove and the piston 5; the second guide ring 12 is sealed between the second assembly groove and the cylinder 4. Specifically, assembly grooves are processed at both ends of the double-headed piston 6, and guide rings are arranged in the assembly grooves to guide and support the double-headed piston 6, thereby ensuring that the double-headed piston 6 is centered and moves axially.

[0055] Preferably, a third assembly groove is formed on the outer wall of one end of the double-headed piston 6, and a fourth assembly groove is formed on the outer wall of the other end. The boosting device 104 also includes: a second seal 11 and a third seal 13. The second seal 11 is sealed between the third assembly groove and the piston 5; the third seal 13 is sealed between the fourth assembly groove and the cylinder 4. Since both ends of the double-headed piston 6 are working surfaces, both ends need to be sealed. Specifically, assembly grooves are respectively processed at both ends of the double-headed piston 6, and a sealing connection between the double-headed piston 6 and the cylinder 4 and the piston 5 is achieved by arranging seals in the assembly grooves. The above-mentioned second seal 11 and third seal 13 can be in the form of a combined seal, which seals the high-pressure liquid, and preferably adopts a thickened retaining ring piston assembly, etc.; a first air seal 14 is formed between the double-headed piston 6 and the cylinder 4 to seal the nitrogen.

[0056] Preferably, the boosting device 104 further includes: a buffer sleeve 7, which is sleeved on one end of the double-headed piston 6 close to the boosting interface 16, and a conical structure is formed on the end of the buffer sleeve 7 close to the boosting interface 16. Specifically, after the boosted liquid returns to the oil, under the action of the inert gas pressure and the liquid pressure in the cylinder, the double-headed piston 6 returns to its original position and may collide with the piston 5. Therefore, the buffer sleeve 7 is installed on the end of the double-headed piston 6 close to the boosting interface 16. When the double-headed piston 6 is reset and moved, it contacts the piston 5 through the buffer sleeve 7, thereby avoiding damage to the double-headed piston 6. On the other hand, the end of the buffer sleeve 7 close to the boosting interface 16 is a conical structure, which changes the annular area of ​​liquid flow between it and the piston 5, forming throttling to further play a buffering role.

[0057] Preferably, a tenth assembly groove is formed at one end of the double-headed piston 6, and the booster device 104 also includes: an eighth sealing member 9, which is sealed between the tenth assembly groove and the buffer sleeve 7 and is used to seal the buffer sleeve 7 to prevent liquid from entering the buffer sleeve 7.

[0058] Preferably, an eleventh assembly groove is formed at one end of the double-headed piston 6, and the booster device 104 further includes: a shaft retaining ring 8, which is arranged between the eleventh assembly groove and the buffer sleeve 7, and the buffer sleeve 7 is fixed to one end of the double-headed piston 6 through the shaft retaining ring 8.

[0059] like Figure 2 In the structure shown, the booster device 104 of this embodiment is applied to the double telescopic column, and its working process includes two working states: in the first working state, the liquid supply device supplies liquid to the double telescopic column, and the second cylinder 300 and the plunger 5 extend at the same time, that is, Figure 3 When in the second working state, the liquid supply device supplies liquid to the boost interface 16, forcing the double-headed piston 6 to move, and the liquid is delivered to the second cylinder 300 through the discharge channel 17 to achieve column boosting, that is, Figure 4 The structure shown.

[0060] like Figure 3 As shown, the column rises: the system supplies liquid to the lower chamber liquid inlet connector seat 103, and at the same time pushes the second cylinder body 102 and the internal booster piston to move simultaneously, and at the same time the liquid in the annular cavity of the piston cylinder of the second cylinder body 102 returns through the upper chamber liquid inlet connector seat 105.

[0061] The column completes the column lifting action and enters the initial support stage. The lower cavity liquid inlet joint seat 103 is closed and locked by the hydraulically controlled one-way valve. When the column actively supports the top beam and top plate: F=P1*π / 4*D1 2 =P2*π / 4*D2 2 ; Where: P—system fluid supply pressure; P1—pressure in the lower cavity of the column; P2—pressure of the second cylinder of the column; D1—column lower cavity diameter; D2—bore diameter of the second cylinder of the column; D3—diameter of the small end piston of the double-headed piston of the booster device; D4—diameter of the big end piston of the double-headed piston of the booster device; like Figure 4 As shown, column pressurization: at this time, the pressurization control liquid joint 108 is supplied with liquid. Under the action of the liquid supply pressure, the double-headed piston 6 of the pressurization device moves downward, and the pressure of the second cylinder is increased through the pressurization device, and the pressure of the lower cavity of the column is increased through the force transmission; at the same time, through the movement of the double-headed piston 6 of the pressurization device, the volume of the discharged high-pressure liquid makes up for the volume of the liquid compressed in the column under the action of high pressure. Pressurization ratio A of the pressurization device: A=(D4 / D3) 2 P1'=P*A / (D1 / D2) 2 = P*(D4 / D3) 2 / (D1 / D2) 2 After pressurization, the pressure in the lower chamber of the column becomes P1'; In order to ensure a good internal boost effect, a suitable boost ratio is designed so that P1' is approximately 1.5P1. Because P1=P, in order to prevent the boost pressure from being too high and not exceeding the pressure corresponding to the designed working resistance of the column, a pressure sensor can be set to monitor P1'. After reaching the specified pressure, the boost ends and the boost control liquid connector 108 is closed and locked.

[0062] When the internal boost column is lowered, the liquid is fed into the upper cavity by the joint seat 105, and at the same time, the boost control liquid joint 108 receives the liquid back. Under the pressure inside the second cylinder body and the pressure of the nitrogen gas, the piston rod of the internal boost device retreats, and the second cylinder body descends to complete the column lowering.

[0063] Embodiment 2: like Figure 5 As shown, in this embodiment, the boosting device 104 further includes: a guide sleeve 23, which is fixed to the end of the piston 5 away from the boosting interface 16. The piston assembly includes: a piston rod 24 and a piston head 25. The piston rod 24 is movably arranged in the piston 5, and one end is arranged near the boosting interface 16, and the other end is movably arranged in the guide sleeve 23, and can extend into the second cylinder body 102. A cavity is formed inside the piston rod 24, and is connected with the annular chamber formed between the piston rod 24 and the piston 5 to form a second gas chamber 26. A second charging valve 22 is provided at one end of the piston rod 24 for charging the second gas chamber 26 with inert gas; the piston head 25 is fixed to the end of the piston rod 24 near the boosting interface 16.

[0064] The guide sleeve 23 is fixed to the piston 5 by a rectangular thread and a retaining ring 2. The guide sleeve 23 is used to guide the movement direction of the piston rod 24 and the piston head 25 to prevent the piston rod 24 from being offset and misaligned after extending into the second cylinder body 102, thereby damaging the second cylinder body 102.

[0065] There is a cavity inside the piston rod 24, and an annular chamber is formed between the piston rod 24 and the piston column 5. The cavity is connected to the annular chamber to form a second gas chamber 26. The second gas filling valve 22 is used to fill the second gas chamber 26 with inert gas, such as nitrogen or helium. When the pressurized liquid pushes the piston rod 24 and the piston head 25 to move, it is necessary to overcome the gas pressure in the second gas chamber 26 at the same time; when the pressurized liquid returns, the piston rod 24 and the piston head 25 are reset due to the pressure of the compressed gas in the second gas chamber 26 and the liquid in the second cylinder 102.

[0066] The pressurization process of the pressurization device 104 of the present invention is as follows: The pressurized liquid is introduced through the pressurizing interface 16 to push the piston head 25 to move, thereby driving the piston rod 24 to move toward the second cylinder 102 and extend into the second cylinder 102, thereby compensating for the liquid volume inside the second cylinder 102 and pressurizing the double telescopic column.

[0067] Preferably, the boosting device further comprises: a second screw plug 21 and a fourth sealing member 27. The second screw plug 21 is disposed at one end of the guide sleeve 23 to block the second gas chamber 26 from the liquid inside the second cylinder 102; the fourth sealing member 27 is sealingly disposed between the second screw plug 21 and the guide sleeve 23. In this embodiment, the function of the second screw plug 21 is similar to that of the first screw plug 1 in Example 1, and the function of the fourth sealing member 27 is similar to that of the first sealing member 15 in Example 1.

[0068] Preferably, a fifth assembly groove is formed on the outer wall of the piston head 25, a sixth assembly groove is formed on the outer wall of the piston rod 24 at one end away from the piston head 25, and the booster device 104 further includes: a third guide ring 28 and a fourth guide ring 29. The third guide ring 28 is sealed between the fifth assembly groove and the piston 5; the fourth guide ring 29 is sealed between the sixth assembly groove and the guide sleeve 23. The functions of the third guide ring 28 and the fourth guide ring 29 in this example are similar to the first guide ring 10 and the second guide ring 12 in Example 1.

[0069] Preferably, a seventh assembly groove is formed on the outer wall of the piston head 25, and an eighth assembly groove is formed on the outer wall of the piston rod 24 away from the piston head. The booster device 104 also includes: a fifth seal and a sixth seal. The fifth seal is sealed between the seventh assembly groove and the piston 5; the sixth seal is sealed between the eighth assembly groove and the guide sleeve 23. The fifth seal consists of a Y-ring 30 and a piston rod combination seal 31; the sixth seal consists of a piston combination seal 32 and a second air seal 33. The sealing connection between the piston rod 24 and the guide sleeve 23, and the sealing connection between the piston head 25 and the piston 5 are achieved through the seal.

[0070] Preferably, a ninth assembly groove is formed on the outer wall of the guide sleeve 23, and the booster device 104 further comprises a seventh sealing member, which is sealed between the ninth assembly groove and the plunger 5. The seventh sealing member is composed of an O-ring with a retaining ring 34 and a Y-ring with a retaining ring 35.

[0071] Preferably, the boosting device 104 further comprises: a buffer sleeve 7, which is sleeved on the piston head 25, and has the same structure as that of embodiment 1, and is also equipped with an eighth sealing member 9 and a shaft retaining ring 8, and the connection method is the same, which will not be described in detail.

[0072] like Figure 6 In the structure shown, the booster device 104 of this embodiment is applied to the double telescopic column, and its working process includes two working states: in the first working state, the liquid supply device supplies liquid to the double telescopic column, and the second cylinder 300 and the plunger 5 extend at the same time, that is, Figure 7When in the second working state, the liquid supply device supplies liquid to the booster interface 16, forcing the piston rod 24 and the piston head 25 to move into the interior of the second cylinder 300 to achieve column boosting, that is, Figure 8 The structure shown.

[0073] like Figure 7 As shown, the column rises: the system supplies liquid to the lower chamber liquid inlet connector seat 103, while pushing the second cylinder body 102 and the inner booster piston to move simultaneously, and at the same time, the liquid in the annular cavity of the piston cylinder of the second cylinder body returns through the upper chamber liquid inlet connector seat 105.

[0074] The column completes the column lifting action and enters the initial support stage. The lower cavity liquid inlet joint seat 3 is closed and locked by the hydraulically controlled one-way valve. When the column actively supports the top beam and top plate: F=P1*π / 4*D1 2 =P2*π / 4*D2 2 ; Where: P—system fluid supply pressure; P1—pressure in the lower cavity of the column; P2—pressure of the second cylinder of the column; D1—column lower cavity diameter; D2—bore diameter of the second cylinder of the column; d3—piston rod diameter of booster device; D3—diameter of piston head of booster device; like Figure 8 As shown, column pressurization: at this time, the pressurization control liquid joint 108 is supplied with liquid. Under the action of the supply pressure, the piston rod of the pressurization device moves downward, and the pressure of the second cylinder is increased through the pressurization device, and the pressure of the lower cavity of the column is increased through the force transmission; at the same time, the piston rod of the pressurization device is extended, and the extended volume makes up for the compressed volume of the liquid inside the column under the action of high pressure. Pressurization ratio A of the pressurization device: A=(D3 / d3) 2 P1'=P*A / (D1 / D2) 2 =P*(D3 / D3) 2 / (D1 / D2) 2 After pressurization, the pressure in the lower chamber of the column becomes P1'; In order to ensure a good internal boost effect, a suitable boost ratio is designed so that P1' is approximately 1.5P1. Because P1=P, in order to prevent the boost pressure from being too large and not exceeding the pressure corresponding to the designed working resistance of the column, a pressure sensor can be set to monitor P1'; when the specified pressure is reached, the boost ends and the boost control liquid connector 108 is closed and locked.

[0075] When the internal boost column is lowered, the liquid is fed into the upper cavity by the joint seat 105, and at the same time, the boost control liquid joint 108 receives the liquid back. Under the pressure inside the second cylinder body and the pressure of the nitrogen gas, the piston rod of the internal boost device retreats, and the second cylinder body descends to complete the column lowering.

[0076] The present invention further provides a hydraulic support, which comprises: a double telescopic column with a pressure-boosting device in an embodiment of the present invention.

[0077] The hydraulic support provided by the present invention has the same advantages as above because it includes the double telescopic columns with the boosting device in the above embodiment of the present invention.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double telescopic column with a pressurizing device, characterized in that: include: A first cylinder body (101), a second cylinder body (102) and a pressure boosting device (104); the second cylinder body (102) is movably arranged in the first cylinder body (101); the pressure boosting device (104) comprises: A piston (5) is movably disposed in the second cylinder body (102), and a pressurizing interface (16) is formed at one end of the piston (5) for introducing pressurized liquid; A piston assembly is movably disposed in the piston (5), and one end of the piston assembly is disposed close to the pressure boosting interface (16); When the pressurized liquid is introduced into the pressurizing interface (16), the piston assembly is pushed to move in a direction extending into the second cylinder (102), thereby inputting the pressurized liquid into the second cylinder (102) and / or compressing the liquid space in the second cylinder (102).

2. The double telescopic column with a pressurizing device according to claim 1, characterized in that: The boosting device (104) further comprises: A cylinder barrel (4) is fixed in the piston (5) and is provided with a liquid discharge channel (17), wherein one end of the liquid discharge channel (17) is in communication with the second cylinder body (102); The piston assembly comprises: a double-headed piston (6) movably disposed in the piston (5), with one end disposed close to the boost interface (16), and the other end movably disposed in the cylinder (4), an annular chamber (18) for containing liquid is formed between the double-headed piston (6) and the piston (5), and the annular chamber (18) is communicated with the other end of the liquid discharge channel (17); A cavity is formed inside the cylinder (4), and the other end of the double-headed piston (6) is inserted into the cavity and sealed to form a first gas chamber (19). A first inflation valve (3) is provided inside the cylinder (4) for filling the first gas chamber (19) with inert gas.

3. The double telescopic column with a pressurizing device according to claim 2, characterized in that: The boosting device (104) further comprises: A first screw plug (1) is provided at one end of the cylinder (4) and is used to block the liquid inside the first gas chamber (19) and the second cylinder (102); A first sealing member (15) is provided for sealing between the first screw plug (1) and the cylinder barrel (4).

4. The double telescopic column with a pressure boosting device according to claim 2, characterized in that: A first assembly groove is formed on the outer wall of one end of the double-headed piston (6), and a second assembly groove is formed on the outer wall of the other end. The boosting device further comprises: A first guide ring (10) is sealingly disposed between the first assembly groove and the piston (5); A second guide ring (12) is sealingly arranged between the second assembly groove and the cylinder barrel (4).

5. The double telescopic column with a pressure boosting device according to claim 2, characterized in that: A third assembly groove is formed on the outer wall of one end of the double-headed piston (6), and a fourth assembly groove is formed on the outer wall of the other end. The boosting device further comprises: A second sealing member (11) is sealingly disposed between the third assembly groove and the piston (5); A third sealing member (13) is provided for sealing between the fourth assembly groove and the cylinder barrel (4).

6. The double telescopic column with a pressurizing device according to claim 1, characterized in that: The boosting device (104) further comprises: A guide sleeve (23) fixed to an end of the piston (5) away from the boost interface (16); The piston assembly comprises: A piston rod (24) is movably disposed in the piston column (5), and one end of the piston rod (24) is disposed close to the boost interface (16), and the other end of the piston rod (24) is movably disposed in the guide sleeve (23) and is capable of extending into the second cylinder body (102). A cavity is formed inside the piston rod (24) and is connected to a cavity formed between the piston rod (24) and the piston column (5) to form a second gas chamber (26). A second charging valve (22) is provided at one end of the piston rod (24) for charging the second gas chamber (26) with an inert gas. The piston head (25) is fixed to one end of the piston rod (24) close to the pressure boosting interface (16).

7. The double telescopic column with a pressure boosting device according to claim 6, characterized in that: The boosting device (104) further comprises: a second screw plug (21), disposed at one end of the guide sleeve (23), and used to block the liquid inside the second gas chamber (26) and the second cylinder (102); A fourth sealing member (27) is provided for sealing between the second screw plug (21) and the guide sleeve (23).

8. The double telescopic column with a pressure boosting device according to claim 6, characterized in that: A fifth assembly groove is formed on the outer wall of the piston head (25), a sixth assembly groove is formed on the outer wall of the piston rod (24) at one end away from the piston head (25), and the boosting device further comprises: A third guide ring (28) is sealingly disposed between the fifth assembly groove and the piston (5); A fourth guide ring (29) is sealingly disposed between the sixth assembly groove and the guide sleeve (23).

9. The double telescopic column with a pressure boosting device according to claim 6, characterized in that: A seventh assembly groove is formed on the outer wall of the piston head (25), an eighth assembly groove is formed on the outer wall of the piston rod (24) at one end away from the piston head (25), and the boosting device further comprises: a fifth sealing member, sealingly disposed between the seventh assembly groove and the piston (5); A sixth sealing member is sealingly disposed between the eighth assembly groove and the guide sleeve (23).

10. The double telescopic column with a pressure boosting device according to claim 6, characterized in that: A ninth assembly groove is formed on the outer wall of the guide sleeve (23), and the pressure boosting device further comprises: A seventh sealing member is provided for sealing between the ninth assembly groove and the piston (5).

11. The double telescopic column with a pressure boosting device according to any one of claims 1 to 10, characterized in that: The boosting device (104) further comprises: The buffer sleeve (7) is sleeved on one end of the piston assembly close to the boost interface (16), and the end of the buffer sleeve (7) close to the boost interface (16) is formed with a conical structure.

12. A hydraulic support, characterized in that: include: A double telescopic column with a pressure boosting device as claimed in any one of claims 1 to 11.

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