Control system for double telescopic stand columns

Abstract

The invention relates to the technical field of hydraulic supports, in particular to a control system for a double-telescopic stand column, which comprises the double-telescopic stand column, a first valve, a second valve and a control device, the double-telescopic stand column comprises a first cylinder body, a second cylinder body and a supercharging device. The supercharging device comprises a plunger and a piston assembly; the movable column is movably arranged in the second cylinder body, and a pressurization connector is formed at one end of the movable column; the piston assembly is movably arranged in the plunger, and one end of the piston assembly is arranged close to the pressurization connector; the first valve is arranged at the pressurization connector, and the second valve is arranged at a liquid opening of the second cylinder body. The control device is in electric control connection with the first valve and the second valve. The double-telescopic stand column adopts a structure with a built-in supercharging device, so that the occupied space is reduced, and the structure is simple; in the column descending process, due to the fact that the first valve is opened firstly, the pressure in the second cylinder body is reduced, when the second valve is opened, the impact pressure of liquid on the second valve is reduced, and therefore the safety of the valve is effectively protected.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic supports, and in particular to a control system for double telescopic columns. 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 support column lowering 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 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 improve the initial support force of the hydraulic support, it is generally necessary to equip a booster device and configure a modified hydraulic system. However, the existing hydraulic system is too large to be modified, occupies a large space, and has complex system pipelines; and when the column is lowered, the hydraulically controlled one-way valve opens, and there is a problem of large pressure shock. The existing solution only relies on increasing the volume of the cavity to absorb the shock and improve the shock resistance, which also leads to the problem of large space occupied by the telescopic column. Summary of the invention

[0003] The present invention provides a control system for double telescopic columns, which is used to solve the defects of large space occupied by the hydraulic system configured in the prior art, such as large modification, large occupied space, complex system pipelines, and large pressure shock when the column is lowered. The shock is absorbed by increasing the volume of the cavity, and the shock resistance is improved, which also leads to the large occupied space.

[0004] The present invention provides a control system for a double telescopic column, comprising: the double telescopic column comprises: a first cylinder body, a second cylinder body, a piston and a piston assembly; The second cylinder body is movably disposed in the first cylinder body; The plunger is movably disposed in the second cylinder body, and a pressurizing interface is formed at one end of the plunger for introducing pressurized liquid; The piston assembly is movably disposed in the piston, and one end of the piston assembly is disposed close to the boost interface; The control system comprises: a first valve, a second valve and a controller; The first valve is connected to the boost interface; The second valve is connected to the liquid port of the second cylinder; The controller is electrically connected to the first valve and the second valve respectively; Among them, based on the fact that the piston assembly moves toward the second cylinder body and increases pressure during the pressurization process, the pressure sealed by the first valve is lower than the pressure sealed by the second valve; in the column lowering process, the first valve is opened first to allow the piston assembly to retreat and at the same time reduce the pressure in the second cylinder body, thereby reducing the pressure shock on the second valve.

[0005] The control system for the double telescopic column provided according to the present invention further includes: a third valve, which is electrically connected to the control device, and the third valve is respectively connected to the first valve and the second valve to control the opening and closing state of the first valve and / or the second valve.

[0006] The control system for the double telescopic column provided by the present invention further includes: a spray device; The first valve includes: a double hydraulically controlled one-way valve; The third valve comprises: a spray valve, which is connected to the spray device and the double-hydraulic-controlled one-way valve respectively through corresponding spray valve cores, and controls liquid to enter the boost interface through the double-hydraulic-controlled one-way valve through the spray valve.

[0007] The control system for the double telescopic columns provided in accordance with the present invention further comprises: a two-position two-position normally closed logic valve, through which the spray valve core is connected to the spray device.

[0008] According to the control system for double telescopic columns provided by the present invention, the second valve comprises: a hydraulically controlled one-way valve; The third valve also includes: a lifting column electromagnetic pilot valve and a lowering column electromagnetic pilot valve, the lifting column electromagnetic pilot valve is connected to the hydraulically controlled one-way valve through a corresponding lifting column valve core, and the lowering column electromagnetic pilot valve is connected to the hydraulically controlled one-way valve through a corresponding lowering column valve core.

[0009] The control system for the double telescopic column provided according to the present invention further includes: a pressure detection device, which is arranged on the second valve.

[0010] According to the control system for double telescopic columns provided by the present invention, when the pressurized liquid is introduced into the pressurization interface, the piston assembly is pushed to move in the direction of extending into the second cylinder, thereby inputting pressurized liquid into the second cylinder and / or compressing the liquid space in the second cylinder.

[0011] According to the control system for a double telescopic column provided by the present invention, the double telescopic column 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.

[0012] According to the control system for a double telescopic column provided by the present invention, the double telescopic column 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.

[0013] According to the control system for a double telescopic column provided by the present invention, the double telescopic column 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.

[0014] The present invention provides a control system for a double telescopic column, which includes: a double telescopic column, a first valve, a second valve and a control device. The present invention provides a control system for a double telescopic column, wherein the double telescopic column adopts a structure of a built-in boosting 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, thereby simplifying the oil circuit design and reducing the cost; by inputting a boosting liquid, the piston assembly is driven to move, and the boosting liquid is input into the second cylinder and / or the liquid space in the second cylinder is compressed, thereby achieving a boosting effect on the double telescopic column; in the process of lowering the column, since the first valve is opened first, the pressure in the second cylinder is reduced, and when the second valve is opened, the impact pressure of the liquid on it is reduced, thereby effectively protecting the safety of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] Figure 1 It is a schematic diagram of the structure of a control system for double telescopic columns provided in one embodiment of the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of the boosting device provided in Example 1 of the present invention.

[0018] Figure 3 It is a schematic structural diagram of a double telescopic column with a pressurizing device provided in Example 1 of the present invention.

[0019] 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 first working state.

[0020] Figure 5 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.

[0021] Figure 6 It is a schematic diagram of the structure of the boosting device provided in Example 2 of the present invention.

[0022] Figure 7 It is a schematic structural diagram of a double telescopic column with a pressurizing device provided in Example 2 of the present invention.

[0023] Figure 8 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.

[0024] Fig. 9 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.

[0025] Reference numerals: 41. Emulsion pump; 42. Unloading valve; 43. Third valve; 44. Control device; 45. Stop valve; 46. Double telescopic column; 47. Hydraulic-controlled one-way valve; 48. Pressure sensor; 49. Pressure gauge; 410. Safety valve; 411. Two-position two-way normally closed logic valve; 412. Spray device; 413. Double hydraulic-controlled one-way valve; 4131. Shuttle valve; 431. Solenoid pilot valve for raising column; 432. Solenoid pilot valve for lowering column; 433. Spray valve; 401. Valve core for raising column; 402. Valve core for lowering column; 403. Valve core for spray; 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

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] Combine the following Figure 1-Figure 9 The present invention describes a system for increasing initial support force and reducing impact by increasing pressure in a double telescopic column 46 , which includes: a double telescopic column 46 , a first valve, a second valve and a control device 44 .

[0032] The double telescopic column 46 comprises: a first cylinder body 101 , a second cylinder body 102 , a piston 5 and a piston assembly. The second cylinder body 102 is movably arranged in the first cylinder body 101 ; the piston 5 and the piston assembly constitute a built-in boosting device 104 .

[0033] 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 .

[0034] The first valve is disposed at the boost interface 16 , the second valve is disposed at the liquid port of the second cylinder 102 , and the control device 44 is electrically connected to the first valve and the second valve respectively.

[0035] In the process of boosting, the piston assembly moves toward the second cylinder 102 and boosts the pressure, so that the pressure sealed by the first valve is lower than the pressure sealed by the second valve; in the process of lowering the column, the first valve is opened first to allow the piston assembly to retreat, while reducing the pressure in the second cylinder 102, thereby reducing the pressure shock on the second valve.

[0036] Optionally, the system uses an emulsion pump 41 to provide hydraulic pressure and is equipped with an unloading valve 42 .

[0037] Specifically, the double telescopic column 46 provided by the present invention is a double telescopic column 46 with a booster device 104, and the booster device 104 is designed to be built-in. 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 boosting liquid, the piston assembly is driven to move, and the boosting liquid is input into the second cylinder and / or the liquid space in the second cylinder is compressed, thereby achieving a boosting effect on the double telescopic column 46.

[0038] The system consisting of the double telescopic columns 46 with the booster device has two functions: 1. increasing the initial support force by means of internal boosting; 2. reducing the pressure impact on the second valve body in the column lowering link through the action of the booster device in the boosting link.

[0039] 1. Improving the initial support force by internal pressurization. Specifically, when the pressurized liquid is introduced into the pressurization interface, the piston assembly is pushed to move in the direction of 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.

[0040] Among them, 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 46, which can be through the movement of the piston assembly, the pressurized liquid is transported into the second cylinder 102, and / or, the piston assembly moves and extends into the second cylinder 102, reducing the volume in the second cylinder 102, that is, compressing the liquid space in the second cylinder 102. Both of the above methods can play a pressurization role, and the two methods can also be used in combination.

[0041] The pressurization process of the above-mentioned pressurization device 104 is as follows: When the pressurized liquid is introduced into the pressurizing 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 46 can be pressurized in two ways: 1. The pressurized liquid is delivered into the second cylinder by the movement of the piston assembly, and the double telescopic column 46 is pressurized by increasing the liquid volume in the second cylinder; 2. The piston assembly is extended into the second cylinder by the movement of the piston assembly, and the double telescopic column 46 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 delivered into the second cylinder, and the piston assembly is used to extend into the second cylinder at the same time.

[0042] 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.

[0043] 2. Through the action of the boosting device 104 in the boosting link, the pressure impact on the second valve body in the column lowering link is reduced. Specifically: it can be understood that the double telescopic column 46 includes three processes of column raising, boosting and column lowering. The column lowering process is after the boosting process. According to the description of the boosting process, when the piston 5 moves toward the direction of the second cylinder 102, the pressure of the boosting liquid inside the piston 5 decreases, that is, the pressure sealed by the first valve decreases. Due to the action of the boosting device 104, the pressure in the second cylinder 102 increases, that is, the pressure sealed by the second valve increases.

[0044] When the pressurization is completed and the column is lowered, control liquid is introduced into the first valve and the second valve in order to control the operation of the first valve and the second valve. The control liquid from the same pressure source is input into the first valve and the second valve, that is, the pressure of the control liquid entering the first valve and the second valve is the same. When the pressure of the control liquid increases continuously, due to the low pressure of the first valve, the first valve opens first, and part of the pressurized liquid in the piston 5 is discharged through the pressurization interface. The piston 5 moves in the direction away from the second cylinder 102, that is, it resets to the initial state. At the same time, the pressure in the second cylinder 102 decreases; afterwards, the control liquid reaches the sealing pressure of the second valve, and the second valve opens. At this time, due to the reset movement of the piston 5, the second cylinder 102 has reduced part of the pressure, reducing the pressure relief pressure, that is, reducing the pressure shock to the second valve. The above shock reduction measures do not need to increase the volume of the chamber, thereby reducing the space occupied by the equipment.

[0045] It should be understood that the double telescopic column 46, the first valve and the second valve may be provided in plurality, preferably, as shown in FIG. Figure 1 In the system shown, two double telescopic columns 46 are provided, and two first valves and two second valves matched therewith are also provided respectively.

[0046] It can be seen that the system for increasing pressure in a double telescopic column 46 and reducing impact provided by the present invention comprises: a double telescopic column 46, a first valve, a second valve and a control device 44. The system for increasing pressure in a double telescopic column 46 and reducing impact provided by the present invention adopts a structure of a built-in supercharging device 104 in the double telescopic column 46. On the one hand, no additional space is required and it can be assembled integrally with the telescopic column. On the other hand, no additional pipeline and control valve are required, which 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 on the double telescopic column 46. In the process of lowering the column, since the first valve is opened first, the pressure in the second cylinder is reduced. When the second valve is opened, the impact pressure of the liquid on it is reduced, thereby effectively protecting the safety of the valve.

[0047] In one embodiment of the present invention, the system for increasing the initial support force and reducing the impact in the double telescopic column 46 further includes: a third valve 43, which is electrically connected to the control device 44, and the third valve 43 is respectively connected to the first valve and the second valve to control the opening and closing state of the first valve and / or the second valve. Specifically, the liquid outlet pressure is controlled by the third valve 43, thereby controlling the opening and closing state of the first valve and / or the second valve.

[0048] In one embodiment of the present invention, the system for increasing the initial support force and reducing the impact in the double telescopic column 46 further includes: a spray device 412. The first valve includes: a double hydraulically controlled one-way valve 413; the third valve 43 includes: a spray valve 433, the spray valve 433 is respectively connected to the spray device 412 and the double hydraulically controlled one-way valve 413 through the corresponding spray valve core 403, and the spray valve 433 controls the liquid to enter the pressurization interface from the double hydraulically controlled one-way valve 413. Specifically, the first valve in this embodiment adopts a double hydraulically controlled one-way valve 413, and the spray valve 433 is connected to the spray device 412 and the double hydraulically controlled one-way valve 413 through the spray valve core 403, one way leads to the spray device 412 for spraying, and the other way leads to the double hydraulically controlled one-way valve 413 for pressurization, that is, the main supply liquid of the pressurization control circuit is shared with the spray valve core 403 (during spraying, the hydraulic supports are in normal support, and pressurization has no effect at this time; similarly, spraying during pressurization does not affect the normal operation of the working surface), that is, spraying while pressurizing, and spraying and pressurization on the same support are carried out simultaneously. A shuttle valve 4131 is added to the pressurization control circuit, and the pressurized liquid enters the double hydraulically controlled one-way valve 413 from the spray valve core 403 and the shuttle valve 4131. If there is no special control single-column lifting column, the shuttle valve 4131 can be cancelled. On the basis of the existing principle, one side of the interface is blocked, and a pipeline from a lifting column to the double hydraulically controlled one-way valve 413 is removed.

[0049] In one embodiment of the present invention, the internal pressurization system for increasing initial support force and reducing impact in the double telescopic column 46 also includes: a two-position two-position normally closed logic valve 411, and the spray valve core 403 is connected to the spray device 412 through the two-position two-position normally closed logic valve 411, and the two-position two-position normally closed logic valve 411 controls the spray device 412 to spray.

[0050] In one embodiment of the present invention, the system for increasing the initial support force and reducing the impact in the double telescopic column 46 further includes: a pressure detection device, which is arranged on the second valve. Preferably, the pressure detection device includes a pressure sensor 48, a pressure gauge 49 and a safety valve 410 connected to the hydraulically controlled one-way valve 47. The pressure in the second cylinder 102 is detected by the pressure sensor 48 and the pressure gauge 49.

[0051] In one embodiment of the present invention, the second valve includes: a hydraulically controlled one-way valve 47; the third valve 43 also includes: a column raising solenoid pilot valve 431 and a column lowering solenoid pilot valve 432, the column raising solenoid pilot valve 431 is connected to the hydraulically controlled one-way valve 47 through the corresponding column raising valve core 401, and the column lowering solenoid pilot valve 432 is connected to the hydraulically controlled one-way valve 47 through the corresponding column lowering valve core 402. The hydraulically controlled one-way valve 47 is used to ensure effective support of the column when the column is not supplied with liquid, and the stop valve 45 is connected to the column liquid inlet pipeline to control the on and off of the column liquid inlet.

[0052] Specifically, during the column raising process: high-pressure liquid enters the shuttle valve 4131 through the pipeline, opens the double-hydraulic-controlled one-way valve 413, and connects the boost control chamber to the return liquid. Under the action of the high-pressure liquid of the column raising, the piston assembly of the boosting device is guaranteed to return to the original position (that is, the initial reset position). The control device 44 monitors the pressure of the pressure sensor 48, and the set pressure of the control device 44 can be 20-30MPa. The column raising process is as follows: the column raising solenoid pilot valve 431 is energized, and the high-pressure liquid reaches the controlled column raising valve core 401 through the column raising solenoid pilot valve 431, and switches to the upper position under the action of the high-pressure liquid to control the column raising. After reaching the set pressure, the column raising solenoid pilot valve 431 loses power, completing the column raising process.

[0053] Pressurization process: The control device 44 determines the pressure value of the lower cavity of the column. When the set pressure is reached, the spray valve 433 is energized, and the high-pressure liquid reaches the controlled spray valve core 403 through the spray valve 433. Under the action of the high-pressure liquid, it switches to the upper position. One high-pressure liquid passes through the spray valve core 403 to the upper position to reach the two-position two-normally closed logic valve 411 to control the spray device 412 to spray; the other high-pressure liquid enters the pressurization interface through the hydraulic control one-way valve 47. Under the action of the pressurization device, the pressure in the lower cavity of the column is increased, thereby increasing the initial support force of the hydraulic support column. When the pressure in the lower cavity of the column reaches the set pressure, the spray valve 433 loses power and the pressurization process ends. The set pressure can be 35-45MPa. The control cavity volume of the pressurization device is small, and the flow rate of the emulsion pump 41 is large. The pressurization process can be completed in a short time.

[0054] Column lowering process: the control device 44 controls the column lowering electromagnetic pilot valve 432 to be energized, and the high-pressure liquid reaches the controlled column lowering valve core 402 through the column lowering electromagnetic pilot valve 432, and switches to the upper position under the action of the high-pressure liquid. The high-pressure liquid is divided into three paths, one path enters the second cylinder body and the piston annular cavity (driving the piston assembly to move), and the other path passes through the control cavity of the hydraulically controlled one-way valve 47 to open the valve core of the hydraulically controlled one-way valve 47. According to the above-mentioned pressurization principle, it can be judged that: the pressure sealed by the hydraulically controlled one-way valve 47 is relatively low, and the pressure sealed by the hydraulically controlled one-way valve 47 in the lower cavity of the column is relatively high; at the same Under the action of the high-pressure liquid of the column, it is obvious that the hydraulically controlled one-way valve 47 opens first, and under the action of the high-pressure liquid inside the column, the piston assembly of the booster device retreats, and the internal volume of the column increases, so that the pressure in the second cylinder of the column and the lower cavity of the column is reduced, and the control cavity through the hydraulically controlled one-way valve 47 of the other path opens the valve core of the hydraulically controlled one-way valve 47, the hydraulically controlled one-way valve 47 opens, and the liquid return passage of the lower cavity of the column is opened. After the pressure of the column is reduced, the hydraulic impact on the hydraulically controlled one-way valve 47 becomes smaller, thereby achieving the control of the column lowering while also reducing the pressure impact on the hydraulically controlled one-way valve 47.

[0055] The double telescopic column of the above embodiment is composed of a first cylinder body 101, a second cylinder body 102, a lower cavity liquid inlet joint seat 103, a booster device 104, an upper cavity 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.

[0056] 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.

[0057] 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.

[0058] The present invention provides two embodiments of double telescopic columns according to different forms of a booster device.

[0059] Embodiment 1: like Figure 2 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 .

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] like Figure 3 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 4 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 5 The structure shown.

[0075] like Figure 4 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.

[0076] like Figure 5 As shown, the column is pressurized: at this time, liquid is supplied to the boost control liquid connector 108, and under the action of the liquid supply pressure, the double-headed piston 6 of the boosting device moves downward, the pressure of the second cylinder is increased through the boosting device, and the pressure in the lower cavity of the column is increased through the transmission of force; at the same time, through the movement of the double-headed piston 6 of the boosting device, the volume of the discharged high-pressure liquid makes up for the compressed volume of the liquid inside the column under the action of high pressure.

[0077] Embodiment 2: like Figure 6 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] like Figure 7 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 8 When 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, Fig. 9 The structure shown.

[0087] like Figure 8 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.

[0088] like Fig. 9 As shown, the column is pressurized: at this time, liquid is supplied to the boost control liquid connector 108, and under the action of the liquid supply pressure, the piston rod of the boosting device moves downward, the pressure of the second cylinder is increased through the boosting device, and the pressure in the lower cavity of the column is increased through the force transmission; at the same time, the piston rod of the boosting 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.

[0089] 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 control system for double telescopic columns, characterized in that: The double telescopic column (46) comprises: a first cylinder body (101), a second cylinder body (102), a piston (5) and a piston assembly; The second cylinder body (102) is movably disposed in the first cylinder body (101); The piston (5) is movably arranged 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 of the piston assembly is disposed close to the pressure boosting interface (16); The control system comprises: a first valve, a second valve and a controller (44); The first valve is connected to the boost interface; The second valve is connected to the liquid port of the second cylinder (102); The controller (44) is electrically connected to the first valve and the second valve respectively; In which, based on the fact that the piston assembly moves toward the second cylinder body (102) and increases pressure during the pressurization process, the pressure sealed by the first valve is lower than the pressure sealed by the second valve; in the column lowering process, the first valve is opened first to allow the piston assembly to retreat, while reducing the pressure in the second cylinder body (102), thereby reducing the pressure shock to the second valve.

2. The control system for double telescopic columns according to claim 1, characterized in that: Also includes: The third valve (43) is electrically connected to the control device (44); the third valve (43) is respectively connected to the first valve and the second valve to control the opening and closing state of the first valve and / or the second valve.

3. The control system for double telescopic columns according to claim 2, characterized in that: Also includes: Spray device (412); The first valve comprises: a double hydraulically controlled one-way valve (413); The third valve (43) comprises: a spray valve (433), wherein the spray valve (433) is respectively connected to the spray device (412) and the double-hydraulic-controlled one-way valve (413) through a corresponding spray valve core (403), and the spray valve (433) controls liquid to enter the boost interface through the double-hydraulic-controlled one-way valve (413).

4. The control system for double telescopic columns according to claim 3, characterized in that: Also includes: A two-position two-way normally closed logic valve (411), wherein the spray valve core (403) is connected to the spray device (412) via the two-position two-way normally closed logic valve (411).

5. The control system for double telescopic columns according to claim 2, characterized in that: The second valve comprises: a hydraulically controlled one-way valve (47); The third valve (43) further comprises: a lifting column electromagnetic pilot valve (431) and a lowering column electromagnetic pilot valve (432); the lifting column electromagnetic pilot valve (431) is connected to the hydraulically controlled one-way valve (47) via a corresponding lifting column valve core (401); and the lowering column electromagnetic pilot valve (432) is connected to the hydraulically controlled one-way valve (47) via a corresponding lowering column valve core (402).

6. The control system for double telescopic columns according to claim 1, characterized in that: Also includes: The pressure detection device is arranged on the second valve.

7. A control system for a double telescopic column according to any one of claims 1 to 6, characterized in that: 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.

8. The control system for double telescopic columns according to claim 7, characterized in that: The double telescopic column (46) 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.

9. The control system for double telescopic columns according to claim 7, characterized in that: The double telescopic column (46) 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).

10. The control system for double telescopic columns according to claim 7, characterized in that: The double telescopic column (46) 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.

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