Hydraulic control check valve for hydraulic support stand column and valve core assembly thereof

Abstract

The utility model relates to a kind of hydraulic control check valve and its valve core subassembly for hydraulic support stand column, valve core subassembly includes screw plug, screw shell, connecting sleeve and screw sleeve, first compression sleeve and second compression sleeve embedded in screw shell;The inner peripheral wall of screw shell has protruding part;First compression sleeve is arranged between protruding part and screw plug, and second compression sleeve is arranged between protruding part and connecting sleeve;Valve stem includes stem end and stem body part;Stem end is slidably connected with the protruding part of screw shell;Left side of stem end is formed as first sealing part, and right side is formed as second sealing part;Valve stem has initial position and right limit position, when initial position, first sealing part and first compression sleeve form first sealing fit;When right limit position, second sealing part and second compression sleeve form second sealing fit, and the sealing effect between valve stem and valve body is enhanced, the stability of the pressure that maintains valve stem in two positions is guaranteed, ensure the stability of one-way valve two-stage unloading process.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic support technology for mining equipment, and in particular to a hydraulically controlled check valve and its valve core assembly for hydraulic support columns. Background Technology

[0002] Hydraulic supports are commonly used roof and floor control equipment in mechanized coal mining processes both domestically and internationally. As an important component of the hydraulic support control system, the working status of the column hydraulic control check valve directly affects the performance of the hydraulic support.

[0003] Under normal circumstances, a hydraulically controlled check valve is the same as a regular check valve, allowing fluid flow in only one direction and preventing reverse flow. When reverse flow is required, simply apply control pressure to the control port. The control piston, under the action of the control pressure, pushes open the check valve core, thus releasing the reverse blocking function.

[0004] Patent CN117662552A discloses a pilot-operated hydraulic check valve and its valve core assembly. The valve core assembly includes a threaded sleeve, a guide sleeve, a push rod, a large valve core, a small valve core, a sealing ring, and a spring. The push rod includes a limiting part and a rod part, with one end connected to the limiting part. The limiting part fits within the guide sleeve, and the limiting part slidably contacts the inner circumferential surface of the guide sleeve. Because the limiting part and the guide sleeve are in direct contact, the sealing effect depends on the precision of their fit. During use, the mating surfaces may experience increased clearance due to wear or hydraulic shock, thus reducing sealing reliability. When the push rod is in the open or closed position, the pressure required for stable opening or closing cannot be maintained, leading to instability in the secondary unloading process of the push rod. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a hydraulic control check valve and its valve core assembly for hydraulic support columns, which solves the technical problem of poor sealing performance of existing hydraulic control check valves leading to instability in the secondary unloading process.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0009] In a first aspect, this utility model provides a valve core assembly for a hydraulically controlled one-way valve used in a hydraulic support column, comprising: a screw plug, a screw housing, a connecting sleeve, and a screw sleeve coaxially connected from left to right; the screw plug covers the left end face of the screw housing and has a damping hole; the connecting sleeve has an inlet hole on its peripheral wall; the screw sleeve has an outlet hole and a pressure relief hole on its peripheral wall, and the right end of the screw sleeve is closed; a first clamping sleeve and a second clamping sleeve are embedded in the screw housing; a valve stem is slidably connected to the inner peripheral wall of the screw housing, the valve stem including a stem end and a stem body; the left side of the stem end is formed as... The first sealing part has a second sealing part formed on the right side; the valve stem has an initial position and a rightward limit position. In the initial position, the first sealing part and the first clamping sleeve form a first sealing fit; in the rightward limit position, the second sealing part and the second clamping sleeve form a second sealing fit; the valve cone and the push rod are located inside the threaded sleeve; when the valve stem moves to the right under the action of the medium from the damping orifice, the stem body first pushes the push rod to the right to connect the pressure relief hole and the liquid inlet hole; then pushes the valve cone and the push rod to move to the right synchronously so that the liquid outlet hole and the pressure relief hole are both connected to the liquid inlet hole.

[0010] Optionally, the inner peripheral wall of the screw housing has a protrusion; the stem end of the valve stem is slidably connected to the protrusion; a first clamping sleeve is disposed between the left end of the protrusion and the screw plug, and a second clamping sleeve is disposed between the right end of the protrusion and the connecting sleeve.

[0011] Optionally, a sealing assembly is provided between the outer peripheral wall of the first and second clamping sleeves and the inner peripheral wall of the screw housing; a sealing assembly is provided between the outer peripheral wall of the stem end of the valve stem and the inner peripheral wall of the protrusion of the screw housing.

[0012] Optionally, the valve stem includes a first stem portion, a second stem portion, and a third stem portion with successively decreasing diameters, and a radial groove is provided at the end of the third stem portion; when the valve stem moves to the right, the third stem portion can push the push rod and the valve cone in sequence; the first stem portion is fixedly connected to one end of the rod end.

[0013] Optionally, the inner peripheral wall of the connecting sleeve is provided with a guide portion, which surrounds the outer periphery of the second rod body of the valve stem, and the second rod body is slidably connected to the guide portion; the peripheral wall of the connecting sleeve is provided with a reflux hole; the reflux hole is located on the left side of the guide portion; the liquid inlet hole is located on the right side of the guide portion; a valve stem return spring is sleeved on the outer periphery of the first rod body and the second rod body of the valve stem, and the two ends of the valve stem return spring abut against the guide portion and the rod end, respectively.

[0014] Optionally, it also includes a third clamping sleeve; the inner peripheral wall of the threaded sleeve and the right end of the connecting sleeve form a groove, and the third clamping sleeve is embedded in the groove; the third clamping sleeve is located on the left side of the liquid outlet hole; the outer peripheral wall of the valve cone is slidably connected to the inner peripheral wall of the threaded sleeve; when the valve cone is in the initial position, the third clamping sleeve and the outer peripheral wall of the left end of the valve cone form a third sealing fit to isolate the liquid outlet hole and the liquid inlet hole.

[0015] Optionally, the push rod includes a front end, a frustum sealing part, a connecting part, a limiting part, and a positioning part that are fixedly connected in sequence; the valve cone is sleeved on the outer periphery of the front end, the frustum sealing part, and the connecting part, and the valve cone and the push rod can slide relative to each other; a push rod return spring is sleeved on the outer periphery of the positioning part, and the two ends of the push rod return spring abut against the limiting part and the threaded sleeve, respectively; a liquid passage is opened at the front end; a gap is provided between the connecting part and the inner wall of the valve cone; when the push rod is in the initial position, the front end protrudes from the left end of the valve cone, and the inner wall of the valve cone and the frustum sealing part form a fourth sealing fit to isolate the pressure relief hole and the liquid inlet hole; when the third rod body of the valve rod pushes the push rod to the right and releases the fourth sealing fit, the pressure relief hole communicates with the liquid inlet hole through the gap, the liquid passage, and the radial groove.

[0016] Optionally, the plug and the shell, the shell and the connecting sleeve, and the connecting sleeve and the screw sleeve are connected and fixed by a first thread; the outer peripheral wall of the screw sleeve is provided with a second thread; the first thread and the second thread have opposite directions of rotation.

[0017] Optionally, the first sealing fit, the second sealing fit, the third sealing fit, and the fourth sealing fit are all conical sealing fits; the conical sealing fit includes an inner conical surface and an outer conical surface that seal with each other; the angle of the inner conical surface is in the range of 54°-72°, and the angle of the outer conical surface is in the range of the inner conical surface angle +2-10°; or, the inner conical surface is an arc surface.

[0018] Secondly, this utility model provides a hydraulically controlled check valve for a hydraulic support column, comprising a valve body and two valve core assemblies; the valve body has multiple control ports, two inlets and one outlet, the control ports are connected to the upper cavity of the column, and the outlet is connected to the lower cavity of the column; the control ports are connected to the damping holes of the two valve core assemblies; the two inlets have separate cavities and are not connected to each other, and the two inlets are respectively connected to the inlet holes of the two valve core assemblies; the pressure relief holes and outlet holes of the two valve core assemblies are both connected to the outlet.

[0019] (III) Beneficial Effects

[0020] The beneficial effects of this utility model are as follows: The valve core assembly of the hydraulic control check valve for a hydraulic support column of this utility model, when the valve stem is in the initial position, forms a first sealing fit between the first sealing part and the first clamping sleeve; when the valve stem is in the rightward extreme position, the second sealing part and the second clamping sleeve form a second sealing fit. This sealing structure enhances the reliability of the seal between the valve stem and the valve body, reduces the risk of leakage of the medium during the movement of the valve stem, ensures the stability of the pressure maintaining the valve stem in the initial position or the rightward extreme position, and ensures the stability of the two-stage unloading process.

[0021] This utility model discloses a hydraulic control check valve for hydraulic support columns. The connection method of the valve body and valve core assembly is convenient for disassembly and assembly. When maintenance or replacement of parts is required, the components can be quickly separated, reducing maintenance difficulty and cost, reducing equipment downtime, and improving the utilization efficiency of hydraulic support columns. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the valve core assembly of a hydraulic control check valve for a hydraulic support column in Embodiment 1 along the left-right direction.

[0023] Figure 2 This is a cross-sectional view along the left and right directions of the valve core assembly of a hydraulic control check valve for a hydraulic support column in the first-stage open state, as shown in Example 1.

[0024] Figure 3 This is a cross-sectional view along the left and right direction of the valve core assembly of a hydraulic control check valve for a hydraulic support column in Embodiment 1, in the second-stage open state.

[0025] Figure 4 for Figure 1 A schematic diagram of the valve stem structure;

[0026] Figure 5 for Figure 1 A schematic diagram of the top rod in the middle;

[0027] Figure 6 for Figure 5 A schematic cross-sectional view of the top rod along point AA;

[0028] Figure 7 for Figure 1 A cross-sectional view of the screw plug in the middle;

[0029] Figure 8 for Figure 7 A top view of the screw plug;

[0030] Figure 9 for Figure 1 An enlarged schematic diagram of the conical sealing fit shown at point I;

[0031] Figure 10 This is a schematic cross-sectional view of the valve core assembly of a hydraulic control check valve for a hydraulic support column in Embodiment 2 along the left-right direction.

[0032] Figure 11 for Figure 10 An enlarged schematic diagram of the conical sealing fit shown at point II;

[0033] Figure 12This is a schematic cross-sectional view along the left-right direction of a hydraulic control check valve for a hydraulic support column in Embodiment 3, wherein the valve core assembly is in the closed state;

[0034] Figure 13 for Figure 12 The image shown is a bottom view of a hydraulically controlled check valve used for a hydraulic support column.

[0035] [Explanation of Labels in the Attached Image]

[0036] 1: Valve body;

[0037] 2: Valve core assembly; 201: Screw sleeve; 2011: Liquid outlet; 2012: Pressure relief hole;

[0038] 202: Push rod; 2021: Front end; 2022: Conical sealing part; 2023: Connecting part; 20231: Flat part; 2024: Limiting part; 2025: Positioning part; 2026: Push rod return spring;

[0039] 203: Valve cone; 204: Third clamping sleeve;

[0040] 205: Connecting sleeve; 2051: Liquid inlet; 2052: Guide section; 2053: Return hole;

[0041] 206: Valve stem; 2061: Stem end; 20611: First sealing part; 20612: Circumferential groove; 20613: Second sealing part;

[0042] 2062: Shaft section; 20621: First shaft section; 20622: Second shaft section; 20623: Third shaft section; 20624: Radial groove;

[0043] 2063: Valve stem return spring;

[0044] 207: Screw housing; 208: Screw plug; 2081: Damping hole; 2082: Mounting hole; 209: First clamping sleeve; 210: Second clamping sleeve; 211: Locating screw;

[0045] 3: Valve body sealing ring; A: Liquid outlet; K: Control port; P: Liquid inlet; A': Pressure detection port. Detailed Implementation

[0046] To better explain and facilitate understanding of this utility model, a detailed description of its specific embodiments is provided below with reference to the accompanying drawings. In this document, directional terms such as "up," "down," "left," and "right" are used interchangeably. Figure 1 The orientation is used as a reference.

[0047] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0048] Example 1:

[0049] Reference Figures 1-9 This embodiment proposes a valve core assembly 2 for a hydraulically controlled check valve used in a hydraulic support column. For example... Figure 1 As shown, the valve core assembly 2 includes a screw plug 208, a screw housing 207, a connecting sleeve 205, and a screw sleeve 201, which are coaxially connected from left to right. The screw plug 208 covers the left end face of the screw housing 207, and the right end of the screw sleeve 201 is closed, forming a generally cylindrical housing of the valve core assembly 2. As an example, the screw plug 208 and the screw housing 207, the screw housing 207 and the connecting sleeve 205, and the connecting sleeve 205 and the screw sleeve 201 are connected and fixed by first threads, and threadlocker is applied between these first threads when assembling the valve core assembly 2. The outer peripheral wall of the screw sleeve 201 is provided with a second thread for fixing the valve core assembly 2 to the valve body 1 of the hydraulic check valve, and the first thread and the second thread have opposite directions of rotation. This ensures that when disassembling the valve core assembly 2 from the valve body 1, the first threads are in a reverse-tightened state, which facilitates the removal of the valve core assembly 2 as a whole from the valve body 1. The thread-locking adhesive ensures that when the valve core assembly 2 is installed into the valve body 1, there is a certain resistance between the first threads to prevent loosening, thus allowing the valve core assembly 2 to be pressed tightly and function normally.

[0050] The valve core assembly 2 also includes a first clamping sleeve 209, a valve stem 206, a second clamping sleeve 210, a third clamping sleeve 204, a valve cone 203, and a push rod 202 disposed within the housing.

[0051] Specifically, refer to Figure 7 and Figure 8 The plug 208 is a disc-shaped structure that covers the left end face of the screw housing 207. Its outer peripheral wall has a left-hand thread, and it is located on the far left of the valve core assembly 2. The inner peripheral wall of the left end of the screw housing 207 has a left-hand thread for threaded connection with the plug 208. To reduce the flow velocity of the medium entering the right side of the plug 208 and reduce the impact of high-pressure medium, a damping hole 2081 is provided on the plug 208. The axis of the damping hole 2081 coincides with the axis of the plug 208. The damping hole 2081 can achieve a damping effect by controlling the flow of the medium. Due to the small diameter of the damping hole 2081, the medium will encounter greater resistance when passing through the hole, resulting in a reduction in the flow velocity of the medium, thus mitigating or suppressing impact or vibration.

[0052] In addition, to facilitate the removal or installation of the plug 208 from the screw housing 207, two mounting holes 2082 are provided on the plug 208 and located on both sides of the damping hole 2081. The diameter of the two mounting holes 2082 is larger than the diameter of the damping hole 2081, and their axes are parallel to the axis of the damping hole 2081, allowing tools to be inserted into the mounting holes 2082 to apply force and rotate the plug 208 for installation or removal. In a specific embodiment, the diameter of the two mounting holes 2082 ranges from 4.8mm to 6.2mm, preferably 5.0mm, and the diameter of the damping hole 2081 ranges from 0.8mm to 2.7mm, preferably 2.0mm.

[0053] The first clamping sleeve 209 is embedded within the screw housing 207. Specifically, the inner peripheral wall of the screw housing 207 has a protrusion, and the first clamping sleeve 209 is disposed between the left end of the protrusion and the screw plug 208. The outer peripheral wall of the first clamping sleeve 209 fits against the inner peripheral wall of the left end of the screw housing 207, the left end of the first clamping sleeve 209 abuts against the right end of the screw plug 208, and its right end abuts against the left end of the protrusion, thereby enabling the threaded connection between the screw plug 208 and the screw housing 207 to clamp the first clamping sleeve 209 to form a tight fit. In addition, a groove for installing a sealing component is provided circumferentially on the outer peripheral wall of the first clamping sleeve 209, which is used to seal the gap between the first clamping sleeve 209 and the inner peripheral wall of the screw housing 207.

[0054] like Figure 4 As shown, the valve stem 206 includes a stem end 2061 and a stem body 2062. The stem end 2061 is slidably connected to the protrusion of the screw housing 207. A sealing assembly is provided between the outer peripheral wall of the stem end 2061 and the inner peripheral wall of the protrusion of the screw housing 207 to achieve a slidable sealing connection between the stem end 2061 of the valve stem 206 and the screw housing 207. Specifically, a circumferential groove 20612 is provided on the outer peripheral wall of the axial intermediate section of the stem end 2061, and the sealing assembly is disposed in the circumferential groove 20612.

[0055] The stem portion 2062 includes a first stem portion 20621, a second stem portion 20622, and a third stem portion 20623, with diameters decreasing sequentially. The first stem portion 20621 is fixedly connected to the right end of the stem end 2061. A tapered transition is used at the diameter change point of the stem portion 2062. A radial groove 20624 is formed on the right end face of the third stem portion 20623 to create a medium flow path, thereby reducing stress concentration on the valve stem 206 and reducing deformation of the valve stem 206 during heat treatment, thus lowering the processing difficulty. The radial groove 20624 can be square, with a width ranging from 1.8mm to 4.1mm, preferably 3.0mm, and a depth ranging from 2.2mm to 3.4mm, preferably 2.4mm. It should be noted that, while ensuring that the push rod 202 and valve cone 203 can be pushed, the diameter of the third rod body 20623 is relatively smaller than that of the first rod body 20621 and the second rod body 20622 in order to accommodate the nominal flow rate of the valve, so as to reduce the pressure loss of the inlet and outlet liquids and meet the nominal flow rate requirements of GB25974.3.

[0056] The left and right ends of the outer peripheral wall of the connecting sleeve 205 are provided with left-hand threads. The left-hand thread at the left end is fixed to the right end of the screw shell 207 by thread, and the left-hand thread at the right end is fixed to the left end of the screw sleeve 201 by thread.

[0057] The second clamping sleeve 210 is embedded within the screw housing 207. Specifically, the second clamping sleeve 210 is positioned between the right end of the protrusion of the screw housing 207 and the connecting sleeve 205. The outer peripheral wall of the second clamping sleeve 210 abuts against the inner peripheral wall of the right end of the screw housing 207, the left end of the second clamping sleeve 210 fits against the right end of the protrusion, and the right end of the second clamping sleeve 210 abuts against the left end of the connecting sleeve 205, so that the threaded connection between the connecting sleeve 205 and the screw housing 207 can clamp the second clamping sleeve 210. Furthermore, the outer peripheral wall of the second clamping sleeve 210 has a circumferentially circumferentially formed groove for installing a sealing component, which seals the gap between the second clamping sleeve 210 and the inner peripheral wall of the screw housing 207.

[0058] The inner peripheral wall of the connecting sleeve 205 is provided with a guide portion 2052. Preferably, the guide portion 2052 is integrally formed with the connecting sleeve 205. The guide portion 2052 is arranged around the outer periphery of the second stem portion 20622 of the valve stem 206, and the second stem portion 20622 is slidably connected to the guide portion 2052. A valve stem return spring 2063 is sleeved on the outer periphery of the first stem portion 20621 and the second stem portion 20622 of the valve stem 206. The left end of the valve stem return spring 2063 abuts against the right end of the stem end 2061, and the right end of the valve stem return spring 2063 abuts against the left end of the guide portion 2052. That is, the two ends of the valve stem return spring 2063 abut against the guide portion 2052 and the stem end 2061, respectively. In a specific embodiment, the spring force of the valve stem return spring 2063 during operation is between 94N and 266N, the outer diameter of the spring should be less than 28.2mm, the inner diameter should be greater than 17mm, and the length during operation is between 31.2 and 42.2mm.

[0059] Preferably, the valve stem return spring 2063 is made of stainless steel (model 06Cr17Ni12Mo2) spring steel wire with a diameter of 3.2mm, an inner diameter of 18.8mm, a mean diameter of 22mm, an outer diameter of 25.2mm, a spring length of 51mm in the free state, a spring length range of 31.2mm-42.2mm in the working state, and a spring force of 108.32N-243.73N.

[0060] The connecting sleeve 205 has an inlet hole 2051 and a return hole 2053 on its peripheral wall. The inlet hole 2051 is located on the right side of the guide portion 2052, and the return hole 2053 is located on the left side of the guide portion 2052. That is, the inlet hole 2051 is opened on the peripheral wall of the connecting sleeve 205 on the right side of the guide portion 2052, and the return hole 2053 is opened on the peripheral wall of the connecting sleeve 205 on the left side of the guide portion 2052. When the medium flows into the connecting sleeve 205 through the inlet hole 2051, it can easily flow into the valve stem spring cavity located on the left side of the guide portion 2052 through the gap between the guide portion 2052 and the second rod body portion 20622. In order to prevent the medium from flowing into the valve stem spring cavity and being unable to be discharged, thus hindering the rightward movement of the valve stem 206, the return hole 2053 is provided so that the medium in the valve stem spring cavity can be discharged, thereby ensuring that the valve stem 206 can move to the right normally.

[0061] The valve stem 206 has a first sealing portion 20611 on its left side and a second sealing portion 20613 on its right side. The valve stem 206 has an initial position and a rightward limit position. In the initial position, the first sealing portion 20611 and the first clamping sleeve 209 form a first sealing engagement. In the rightward limit position, the second sealing portion 20612 and the second clamping sleeve 210 form a second sealing engagement.

[0062] Figure 1The diagram shows the valve stem 206 in its initial position. At this time, the valve stem return spring 2063 is in its initial compressed state, applying a leftward thrust to the stem end 2061 of the valve stem 206. This causes the outer peripheral wall of the first sealing part 20611 to press against the inner peripheral wall of the first clamping sleeve 209, forming a first sealing fit. Preferably, the first sealing fit is a conical sealing fit, where the outer peripheral wall of the first sealing part 20611 constitutes the inner conical surface of the conical sealing fit, and the inner peripheral wall of the first clamping sleeve 209 constitutes the outer conical surface of the conical sealing fit.

[0063] Figure 2 The diagram illustrates the state of valve stem 206 during rightward movement. When the medium enters the control cavity formed by the plug 208, the first clamping sleeve 209, and the stem end 2061 from the damping orifice 2081, the medium in the control cavity exerts a rightward thrust on the stem end 2061. This force overcomes the elastic restoring force exerted by the valve stem return spring 2063 on the stem end 2061, causing the valve stem 206 to slide to the right under the guidance of the protrusion of the screw housing 207 and the guide portion 2052 of the connecting sleeve 205. Simultaneously, the valve stem return spring 2063 is continuously compressed until the valve stem 206 reaches its rightward movement limit position.

[0064] Figure 3 The diagram shows the state of the valve stem 206 when it is in its rightward extreme position. At this time, the valve stem return spring 2063 is in its maximum compressed state, and the outer peripheral wall of the second sealing part 20613 presses against the inner peripheral wall of the second clamping sleeve 210, forming a second sealing fit. Preferably, the second sealing fit is a conical sealing fit, where the outer peripheral wall of the second sealing part 20613 constitutes the inner conical surface of the conical sealing fit, and the inner peripheral wall of the second clamping sleeve 210 constitutes the outer conical surface of the conical sealing fit.

[0065] The valve stem 206 is axially positioned and guided by the inner circular surface of the protrusion of the screw housing 207. It cooperates with the first clamping sleeve 209 and the second clamping sleeve 210, which are also axially positioned and guided by the inner circular surfaces of the left and right sides of the protrusion of the screw housing 207, to form a conical seal. Because the form and position deviation transmission chain between the valve stem 206 and the first clamping sleeve 209 and the second clamping sleeve 210 is very short, it is easier to ensure the coaxiality among the three, which helps to increase the durability of the first and second sealing fits in the hydraulic check valve.

[0066] The first clamping sleeve 209 and the second clamping sleeve 210 adopt a detachable structure so that they can be separated from the screw housing 207. This reduces the processing difficulty of key parts and makes the structure easy to install. It also helps to maintain the coaxiality between the conical sealing mating parts, thereby increasing the durability of the conical seal of the hydraulic control check valve.

[0067] The valve stem 206 employs a two-stage sealing design: the first-stage seal includes a sealing assembly between the outer peripheral wall of the stem end 2061 and the inner peripheral wall of the protrusion of the screw housing 207; the second-stage seal includes a first sealing fit between the first sealing part 20611 of the stem end 2061 and the first clamping sleeve 209, a second sealing fit between the second sealing part 20612 of the stem end 2061 and the second clamping sleeve 210, a sealing assembly between the outer peripheral wall of the first clamping sleeve 209 and the inner peripheral wall of the screw housing 207, and a sealing assembly between the outer peripheral wall of the second clamping sleeve 210 and the inner peripheral wall of the screw housing 207. This two-stage sealing design prevents the first-stage seal from failing due to friction and wear caused by the continuous left-right movement of the sealing assembly against the screw housing 207 after prolonged use.

[0068] The inner circumferential wall of the left end of the threaded sleeve 201 is provided with a left-hand thread, and the left-hand thread of the right end of the connecting sleeve 205 is threadedly connected and fixed to the threaded sleeve 201. Simultaneously, a groove is formed between the inner circumferential wall of the threaded sleeve 201 and the right end of the connecting sleeve 205, and the third clamping sleeve 204 is embedded in this groove. Furthermore, a groove for installing a sealing component is formed circumferentially on the outer circumferential wall of the third clamping sleeve 204, which seals the gap between the third clamping sleeve 204 and the inner circumferential wall of the threaded sleeve 201.

[0069] The outer peripheral wall of the right end of the screw sleeve 201 is provided with a right-hand thread. The right end of the screw sleeve 201 is closed and the end face is an external hexagonal shape. The disassembly tool can be fixed on the external hexagonal shape of the right end of the screw sleeve 201 to apply force to disassemble or install the valve core assembly 2, which facilitates the maintenance and replacement of the valve core assembly 2.

[0070] The sleeve 201 has a liquid outlet hole 2011 on its peripheral wall, and the liquid outlet hole 2011 is located on the right side of the third clamping sleeve 204. The valve cone 203 is located inside the sleeve 201, and the outer peripheral wall of the valve cone 203 is slidably connected to the inner peripheral wall of the sleeve 201. When the valve cone 203 is in the initial position, the outer peripheral wall of the left end of the valve cone 203 abuts against the inner peripheral wall of the third clamping sleeve 204, and the two seal against each other to form a third sealing fit, thereby isolating the liquid outlet hole 2011 and the liquid inlet hole 2051. Preferably, the third sealing fit is a conical sealing fit, where the outer peripheral wall of the left end of the valve cone 203 constitutes the inner conical surface in the conical sealing fit, and the inner peripheral wall of the third clamping sleeve 204 constitutes the outer conical surface in the conical sealing fit. When the valve cone 203 moves to the right under the push of the valve stem 206 or the medium pressure from the liquid inlet hole 2051 to release the seal, the liquid outlet hole 2011 and the liquid inlet hole 2051 are connected.

[0071] The valve cone 203 relies on the inner circular surface of the threaded sleeve 201 for axial positioning and guidance. It cooperates with the third clamping sleeve 204, which also relies on the inner circular surface of the threaded sleeve 201 for axial positioning and guidance, to form a conical seal. Because the form and position deviation transmission chain between the valve cone 203 and the third clamping sleeve 204 is very short, it is easier to ensure their coaxiality, which is beneficial to increasing the durability of the third sealing fit in the hydraulic check valve.

[0072] The third clamping sleeve 204 adopts a detachable structure, which can be separated from the threaded sleeve 201. This reduces the processing difficulty of key parts, makes the structure easy to install, and helps maintain the coaxiality between the conical sealing mating parts, thereby increasing the durability of the conical seal of the hydraulic control check valve.

[0073] The sleeve 201 is also provided with a pressure relief hole 2012 on its peripheral wall, and the pressure relief hole 2012 is located on the right side of the valve cone 203.

[0074] The push rod 202 is located inside the threaded sleeve 201. For example... Figure 5 As shown, the push rod 202 includes a front end portion 2021, a frustum-shaped sealing portion 2022, a connecting portion 2023, a limiting portion 2024, and a positioning portion 2025, which are fixedly connected in sequence. The front end portion 2021, the connecting portion 2023, the limiting portion 2024, and the positioning portion 2025 are all cylindrical. The diameter of the front end portion 2021 is smaller than the diameter of the connecting portion 2023, and the diameter of the limiting portion 2024 is larger than the diameter of the connecting portion 2023 and also larger than the diameter of the positioning portion 2025.

[0075] like Figure 1As shown, the valve cone 203 is sleeved on the outer periphery of the front end 2021, the frustum sealing part 2022, and the connecting part 2023, and the valve cone 203 and the push rod 202 can slide relative to each other. The push rod 202 is axially positioned and guided by the inner circular surface of the valve cone 203 through the connecting part 2023. A push rod return spring 2026 is sleeved on the outer periphery of the positioning part 2025, and the two ends of the push rod return spring 2026 abut against the right end of the limiting part 2024 and the threaded sleeve 201, respectively. In the initial state of the valve core assembly 2, the push rod return spring 2026 is compressed, and the push rod return spring 2026 applies a leftward thrust to the push rod 202 through the limiting part 2024, so that the outer peripheral wall of the frustum sealing part 2022 abuts against the inner peripheral wall of the valve cone 203, and the two seal against each other to form a fourth sealing fit to isolate the pressure relief hole 2012 and the liquid inlet hole 2051. Preferably, the fourth sealing fit is a conical sealing fit, where the outer peripheral wall of the conical sealing part 2022 forms the inner conical surface of the conical sealing fit, and the inner peripheral wall of the valve cone 203 forms the outer conical surface of the conical sealing fit. Simultaneously, under the thrust of the push rod return spring 2026, the front end 2021 protrudes from the left end face of the valve cone 203, forming a third sealing fit between the valve cone 203 and the third clamping sleeve 204. That is, in the initial state of the valve core assembly 2, both the liquid outlet 2011 and the pressure relief hole 2012 are isolated from the liquid inlet 2051.

[0076] The push rod 202 relies on the inner circular surface of the valve cone 203 for axial positioning and guidance, and the cone sealing part 2022 of the push rod 202 and the inner peripheral wall of the valve cone 203 cooperate to form a cone surface seal. Since the push rod 202 and the valve cone 203 are directly axially positioned, the coaxiality deviation between them is extremely small, which is beneficial to increasing the durability of the cone surface seal.

[0077] The positioning part 2025 of the push rod 202 forms a limiting relationship with the screw sleeve 201. When the medium flows into the valve core assembly 2 from the inlet hole 2051, the medium overcomes the leftward thrust applied by the push rod return spring 2026 and pushes the valve cone 203, push rod 202 and push rod return spring 2026 to move to the right in approximately synchronously. In the initial state, the distance between the right end of the positioning part 2025 and the screw sleeve 201 limits the maximum compression of the push rod return spring 2026, preventing it from shortening its rebound length due to excessive compression and maintaining its good working condition.

[0078] In a specific embodiment, the outer diameter, middle diameter, inner diameter, elastic force range, length in the free state, and length range in the working state of the push rod return spring 2026 and the valve stem return spring 2063 are the same, and will not be described again here.

[0079] like Figure 5As shown, the front end 2021 of the push rod 202 has a liquid passage, which is specifically a T-shaped circular hole channel. The diameter of the circular hole ranges from 1.5mm to 3.2mm, preferably 2.0mm. More specifically, the T-shaped circular hole channel includes a first circular hole channel coaxial with the axis of the push rod 202 and a second circular hole channel perpendicularly intersecting the axis of the first circular hole channel, and the second circular hole channel penetrates the circumferential sidewall of the front end 2021.

[0080] Furthermore, at least one flat portion 20231 is provided on the circumferential sidewall of the connecting portion 2023. The length of the flat portion 20231 is equal to the axial length of the connecting portion 2023, and the extending direction of the flat portion 20231 is parallel to the axial direction of the connecting portion 2023. Preferably, there are three flat portions 20231, which are evenly arranged circumferentially on the connecting portion 2023. By providing the flat portions 20231, a gap is left between the connecting portion 2023 of the push rod 202 and the inner wall of the valve cone 203, forming a high-pressure medium channel while satisfying the axial positioning of the push rod 202, so as to achieve the purpose of smooth passage of high-pressure medium.

[0081] Specifically, such as Figure 5 and Figure 6 As shown, when the third stem portion 20623 of the valve stem 206 pushes the top rod 202 to the right, causing the fourth sealing engagement to be released, the pressure relief hole 2012 communicates with the liquid inlet hole 2051 through the gap between the connecting portion 2023 and the valve cone 203, the gap between the cone sealing portion 2022 and the valve cone 203, the liquid passage of the front end portion 2021, and the radial groove 20624 on the right end face of the third stem portion 20623.

[0082] The aforementioned sealing assembly includes an O-ring and retaining rings, and more specifically, includes an O-ring and two retaining rings disposed on both sides of the O-ring.

[0083] The first, second, third, and fourth sealing fits mentioned above are all conical sealing fits. A conical sealing fit includes an inner and an outer conical surface that seal against each other. The angle of the inner conical surface ranges from 54° to 72°, and the angle of the outer conical surface ranges from the inner conical surface angle +2° to 10°. Preferably, the inner conical surface angle is 60°, and the outer conical surface angle ranges from the inner conical surface angle +4°. The inner conical surface angle is twice the angle between the axis of symmetry of the cone to which the inner conical surface belongs and the inner conical surface itself; that is, the apex angle of the entire inner conical surface. The outer conical surface angle is twice the angle between the axis of symmetry of the cone to which the outer conical surface belongs and the outer conical surface itself; that is, the apex angle of the entire outer conical surface.

[0084] The valve core assembly 2 operates in two states: one-way flow and reverse flow. In the one-way flow state, the hydraulic check valve functions similarly to a regular check valve. The medium can flow into the valve core assembly 2 from the inlet port 2051 and overcome the elastic force of the push rod return spring 2026 to push the valve cone 203 and the push rod 202 to the right synchronously until the third sealing engagement is released, after which the medium flows out from the outlet port 2011. That is, the medium can only flow from the inlet port 2051 to the outlet port 2011. When no external force is applied, the medium cannot flow back from the outlet port 2011 to the inlet port 2051.

[0085] The reverse conduction state is a crucial state that distinguishes the hydraulically controlled check valve from the ordinary check valve. The specific process of changing from the one-way conduction state to the reverse conduction state is as follows: The high-pressure medium flows into the valve core assembly 2 from the damping orifice 2081 and pushes the valve stem 206 to the right, overcoming the elastic force of the valve stem return spring 2063. The stem body 2062 first pushes the push rod 202 to the right until the front end 2021 of the push rod 202 is flush with the left end of the valve cone 203. At this time, the fourth sealing fit is released, thereby connecting the pressure relief hole 2012 and the liquid inlet hole 2051. The medium can flow from the pressure relief hole 2012 to the liquid inlet hole 2051. (Refer to...) Figure 2 At this time, valve core assembly 2 is in the first-stage open state. The rod body 2062 continues to push the valve cone 203 and push rod 202 to the right synchronously under the pressure of the medium until the valve rod 206 reaches its rightward limit. At this point, while maintaining the fourth sealing engagement, the third sealing engagement is also disengaged, thus enabling both the liquid outlet 2011 and the pressure relief hole 2012 to connect with the liquid inlet 2051. (Refer to...) Figure 3 At this time, valve core assembly 2 is in the second-stage open state. At this time, the rod end 2061 of valve stem 206 remains stationary, and the medium can flow from the liquid outlet 2011 and the pressure relief hole 2012 to the liquid inlet 2051 respectively, realizing the reverse conduction state.

[0086] The advantage of the valve core assembly 2 adopting a two-stage opening mode to achieve reverse conduction is that when the hydraulic support is in place, the pressure in the lower chamber of the column can reach 49MPa. If a single-stage direct opening mode is used at this time, it will cause a strong hydraulic shock. However, with the two-stage opening mode, a small portion of the high-pressure medium can first flow out from the liquid passage opened at the left end of the push rod 202 and the radial groove 20624 set at the right end of the valve stem 206. Since the flow rate of the high-pressure medium is small at this time, the hydraulic shock is also small. Therefore, no strong hydraulic shock will be formed when the second stage is opened, which effectively protects the elbows, pressure gauges, pressure sensors and other functional components connected to the hydraulic control check valve and avoids safety accidents.

[0087] Example 2:

[0088] Reference Figure 10 and Figure 11Example 2 provides another valve core assembly for a hydraulically controlled check valve used in a hydraulic support column. Example 2 has essentially the same structure and function as the valve core assembly 2 of Example 1. Only the differences from Example 1 are described here; for the remaining identical structural parts, please refer to the description of Example 1.

[0089] Reference Figure 10 In this embodiment, thread-locking adhesive is removed and a positioning screw 211 is installed at the first threaded connection between the screw plug 208 and the screw shell 207, between the screw shell 207 and the connecting sleeve 205, and between the connecting sleeve 205 and the screw sleeve 201, so as to ensure that the valve core structure is in a compressed state when the valve core assembly 2 is disassembled and installed as a whole, and to avoid relative rotation between the components of the valve core assembly 2.

[0090] Specifically, the locating screw 211 is an M3 internal hex socket locating screw with a length range of 2.5mm-5mm.

[0091] Reference Figure 11 In this embodiment, the inner conical surfaces of the first, second, third, and fourth sealing fits are of an arc-shaped design. The arc-shaped surface exhibits a smooth, curved transition, making it easier to produce minute elastic deformation under pressure. This deformation allows it to better conform to the shape of the outer conical surface, forming a wider and more uniform contact band, resulting in a tighter contact between the two and effectively preventing media leakage, thus achieving a better sealing effect. Preferably, the radius of the arc surface is 2 mm.

[0092] Example 3:

[0093] Reference Figure 12 and 13 The hydraulically controlled check valve for a hydraulic support column of this utility model includes a valve body 1, a valve body end face sealing ring 3, and two valve core assemblies 2. The two valve core assemblies 2 are fixedly connected to the valve body 1 by threads on the outer peripheral wall of a threaded sleeve 201. Multiple fixing holes are provided on the valve body 1 for installing fixing bolts when the valve body 1 is connected to the hydraulic support column.

[0094] The valve body 1 has multiple control ports K, two inlet ports P, two pressure detection ports A', and one outlet port A. Control ports K connect to the upper cavity of the hydraulic support column, and outlet port A connects to the lower cavity of the hydraulic support column. Control ports K communicate with the damping holes 2081 of the two valve core assemblies 2. The two inlet ports P have separate cavities and are not interconnected. The two inlet ports P are respectively connected to the inlet holes 2051 of the two valve core assemblies 2, effectively preventing the superposition of hydraulic shock waves generated when the flow direction changes or the flow is interrupted, thus preventing the formation of a more powerful hydraulic shock wave. The pressure relief holes 2012 and outlet holes 2011 of the two valve core assemblies 2 are both connected to outlet port A, allowing the two valve core assemblies 2 to jointly supply fluid to the lower cavity of the column. The two pressure detection ports A' are respectively connected to the two valve core assemblies 2; more specifically, each pressure detection port A' is connected to the outlet hole 2011 and pressure relief hole 2012 of the same valve core assembly 2. Two pressure detection ports A' are used to connect pressure gauges or pressure sensors to measure the pressure changes of the two valve core assemblies 2 in real time.

[0095] The valve body end face sealing ring 3 is installed in the annular groove at the liquid outlet A on the back of the valve body, and is used to seal when the valve body 1 is connected to the lower cavity of the hydraulic support column.

[0096] After the valve core assembly 2 is installed on the valve body 1, the two larger mounting holes 2082 fit against the valve body 1. When the control port K is pressurized, the pressurized fluid cannot enter the left end of the valve stem 206 through the two mounting holes 2082, but can only enter the left end of the valve stem 206 through the smaller damping hole 2081 in the middle. This can reduce the impact when the control port K is pressurized and at the same time reduce the movement speed of the valve stem 206, so that the speed at which the valve stem 206 pushes the push rod 202 and the valve cone 203 is reduced, thereby reducing the amplitude of the hydraulic shock wave when the valve core is opened.

[0097] Specifically, the valve body 1 has four control ports K. The control ports K are preferably DN12 quick-connect interfaces to accommodate the interface specifications of most hydraulic support column upper chambers. The pressure detection port A' is preferably a DN10 quick-connect interface to accommodate the interface specifications of most pressure gauges or pressure sensors. The inlet port P is preferably a DN19 or DN25 quick-connect interface to accommodate the nominal flow rate requirement of 1000L / min or 1600L / min for the column hydraulic control check valve. The diameter of the outlet port A is preferably 24mm or 30mm to accommodate the nominal flow rate requirement of 1000L / min or 1600L / min for the column hydraulic control check valve. The diameter of the fixing hole is preferably 12.5mm or 16.5mm to accommodate the outer diameter of standard M12 or M16 bolts.

[0098] The working process of the hydraulic control check valve for hydraulic support columns of this utility model is as follows:

[0099] (1) The lifting process of the hydraulic support column is the loading process of the hydraulic control check valve. In the initial state, the valve core assembly 2 of the hydraulic control check valve forms a first sealing fit, a third sealing fit and a fourth sealing fit. The valve stem 206 does not contact the push rod 202 and the valve cone 203. The liquid outlet 2011 and the pressure relief hole 2012 are isolated from the liquid inlet 2051.

[0100] When the hydraulic support column needs to be raised, the high-pressure medium supplied by the hydraulic pump station flows through the hydraulic pipeline to the inlet P of the hydraulically controlled check valve. The high-pressure medium enters the inlet hole 2051 of the valve core assembly 2 through the inlet P. Subsequently, the high-pressure medium exerts a rightward thrust on the valve cone 203 and the push rod 202, overcoming the elastic force of the push rod return spring 2026. The valve cone 203 and the push rod 202 move to the right, connecting the inlet hole 2051 and the outlet hole 2011, and the hydraulically controlled check valve opens in the forward direction. The high-pressure medium flows out of the valve core assembly 2 from the outlet hole 2011 to the outlet A, and finally flows from the outlet A to the lower cavity of the hydraulic support column, providing support force to the column. Meanwhile, the upper cavity of the hydraulic support column remains in a low-pressure or unpressurized state. The pressure difference between the upper and lower cavities helps to push the hydraulic support column upward, completing the column raising process.

[0101] It should be noted that after the column raising process is completed, the hydraulic pump station stops pumping high-pressure medium to the inlet P. The valve cone 203 and the push rod 202 move to the left and return to their initial positions under the action of the push rod return spring 2026, re-forming the third sealing fit to isolate the outlet hole 2011 and the inlet hole 2051. That is, after the column raising process is completed, the valve core assembly 2 automatically switches to the closed state to prevent backflow of the medium in the lower chamber of the column, thus maintaining pressure in the lower chamber and ensuring stable and reliable support force.

[0102] (2) The process of lowering the hydraulic support column, i.e. the unloading process of the hydraulic control check valve. When the hydraulic support is working normally, the hydraulic support column needs to maintain pressure, and the hydraulic control check valve plays a reverse shut-off role.

[0103] When the hydraulic support column needs to be lowered, control pressure needs to be applied through the control port to open the hydraulic check valve in the reverse direction, so that the high-pressure medium flows back from the lower chamber of the column to the hydraulic pump station, thereby unloading the pressure.

[0104] First-stage opening: First, the hydraulic system is controlled to input high-pressure medium into the control port K. Part of the high-pressure medium enters the control chamber at the left end of the valve stem 206 through the damping hole 2081, and the other part of the high-pressure medium is delivered to the upper chamber of the hydraulic support column, so that the pressure in the upper chamber increases and balances with the pressure in the lower chamber, reducing the supporting force of the high-pressure medium in the lower chamber on the column, and at the same time avoiding the phenomenon of jamming due to the low pressure in the upper chamber during the column lowering process. The high-pressure medium in the control chamber pushes the valve stem 206 to move to the right against the elastic force of the valve stem return spring 2063. The valve stem 206 pushes the push rod 202 out of the front end 2021 of the valve cone 203, causing the push rod 202 to move to the right, thus releasing the fourth sealing fit between the push rod 202 and the valve cone 203. At this time, the pressure relief hole 2012 and the inlet hole 2051 are connected. The high-pressure medium in the lower cavity of the hydraulic support column flows through the outlet A to the pressure relief hole 2012, flows through the gap between the inner peripheral wall of the valve cone 203 and the outer peripheral wall of the connection part 2023 of the push rod 202, enters the fluid passage of the front end 2021 of the push rod 202, flows through the radial groove 20624 at the right end of the third rod body 20623 to the inlet hole 2051, and finally flows from the inlet P to the hydraulic pump station. At this time, the flow rate of the high-pressure medium is relatively small, mainly to achieve pressure unloading and reduce the pressure of the high-pressure medium.

[0105] Secondary opening: Under the continuous push of the high-pressure medium in the control chamber, the valve stem 206 continues to move to the right. When the front end 2021 of the push rod 202 is flush with the left end face of the valve cone 203, the valve stem 206 pushes the valve cone 203 and the push rod 202 to move to the right synchronously until the valve stem 206 reaches its rightward limit position. At this time, while maintaining the fourth sealing engagement, the third sealing engagement between the valve cone 203 and the third clamping sleeve 204 is released, and both the outlet hole 2011 and the pressure relief hole 2012 are connected to the inlet hole 2051, realizing the reverse conduction of the hydraulic control check valve. The high-pressure medium in the lower chamber of the hydraulic support column flows not only to the inlet hole 2051 through the pressure relief hole 2012, but also to the inlet hole 2051 through the outlet hole 2011, and finally flows back to the hydraulic pump station, completing the lowering process of the hydraulic support column. At this time, the flow rate of the high-pressure medium is large, realizing the discharge of the high-pressure medium at low pressure and large flow rate.

[0106] This utility model discloses a hydraulically controlled check valve for a hydraulic support column. By employing a two-stage sealing system between the valve stem 206 and the screw housing 207, it effectively prevents seal failure caused by friction and wear between the sealing assembly installed in the circumferential groove 20612 at the end 2061 of the valve stem 206 and the screw housing 207 during prolonged use due to continuous left-right movement. Furthermore, by providing a damping hole 2081 on the screw plug 208 and using a two-stage opening valve core assembly, the hydraulic shock caused by the instantaneous opening of the lower chamber of the column under pressure is mitigated. Simultaneously, the separate, non-communicating cavities at the two inlets P effectively prevent the superposition and resonance of hydraulic shock waves generated when the hydraulically controlled check valve changes flow direction or interrupts flow, thus preventing the formation of a more powerful hydraulic shock wave. This effectively prevents safety accidents caused by a more powerful hydraulic shock wave and protects functional components connected to the hydraulically controlled check valve, such as elbows, pressure gauges, and pressure sensors, from damage due to excessive hydraulic shock.

[0107] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0108] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0109] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0110] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0111] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A valve core assembly for a hydraulically controlled check valve used in a hydraulic support column, characterized in that, include: From left to right, the screw plug (208), screw shell (207), connecting sleeve (205), and screw sleeve (201) are coaxially connected. The screw plug (208) covers the left end face of the screw shell (207) and has a damping hole (2081). The connecting sleeve (205) has a liquid inlet hole (2051) on its peripheral wall. The screw sleeve (201) has a liquid outlet hole (2011) and a pressure relief hole (2012) on its peripheral wall. The right end of the screw sleeve (201) is closed. A first clamping sleeve (209) and a second clamping sleeve (210) are embedded in the screw shell (207); A valve stem (206) is slidably connected to the inner peripheral wall of the screw housing (207). The valve stem (206) includes a stem end (2061) and a stem body (2062). The left side of the stem end (2061) forms a first sealing part (20611), and the right side forms a second sealing part (20613). The valve stem (206) has an initial position and a rightward limit position. In the initial position, the first sealing part (20611) and the first clamping sleeve (209) form a first sealing fit. In the rightward limit position, the second sealing part (20613) and the second clamping sleeve (210) form a second sealing fit. The valve cone (203) and the push rod (202) are located inside the screw sleeve (201); When the valve stem (206) moves to the right under the action of the medium from the damping orifice (2081), the stem body (2062) first pushes the top rod (202) to the right to connect the pressure relief orifice (2012) and the liquid inlet (2051); then pushes the valve cone (203) and the top rod (202) to move to the right simultaneously so that the liquid outlet (2011) and the pressure relief orifice (2012) are both connected to the liquid inlet (2051).

2. The valve core assembly of the hydraulically controlled check valve for a hydraulic support column as described in claim 1, characterized in that, The inner peripheral wall of the screw housing (207) has a protrusion; the rod end (2061) of the valve stem (206) is slidably connected to the protrusion; the first clamping sleeve (209) is disposed between the left end of the protrusion and the screw plug (208), and the second clamping sleeve (210) is disposed between the right end of the protrusion and the connecting sleeve (205).

3. The valve core assembly of the hydraulically controlled check valve for a hydraulic support column as described in claim 2, characterized in that, A sealing assembly is provided between the outer peripheral wall of the first clamping sleeve (209) and the second clamping sleeve (210) and the inner peripheral wall of the screw shell (207); a sealing assembly is provided between the outer peripheral wall of the rod end (2061) of the valve stem (206) and the inner peripheral wall of the protrusion of the screw shell (207).

4. The valve core assembly of the hydraulically controlled check valve for a hydraulic support column as described in claim 1, characterized in that, The stem (2062) of the valve stem (206) includes a first stem (20621), a second stem (20622) and a third stem (20623) with successively decreasing diameters, and the end of the third stem (20623) is provided with a radial groove (20624); When the valve stem (206) moves to the right, the third rod body (20623) can push the top rod (202) and the valve cone (203) in turn. The first shaft portion (20621) is fixedly connected to one end of the shaft end portion (2061).

5. The valve core assembly of the hydraulically controlled check valve for a hydraulic support column as described in claim 4, characterized in that, The inner peripheral wall of the connecting sleeve (205) is provided with a guide portion (2052), which surrounds the outer periphery of the second rod body portion (20622) of the valve stem (206), and the second rod body portion (20622) and the guide portion (2052) are slidably connected. The connecting sleeve (205) has a reflux hole (2053) on its peripheral wall; the reflux hole (2053) is located on the left side of the guide part (2052); the liquid inlet hole (2051) is located on the right side of the guide part (2052); A valve stem return spring (2063) is sleeved on the outer periphery of the first stem portion (20621) and the second stem portion (20622) of the valve stem (206), and the two ends of the valve stem return spring (2063) abut against the guide portion (2052) and the stem end portion (2061) respectively.

6. The valve core assembly of the hydraulically controlled check valve for a hydraulic support column as described in claim 5, characterized in that, It also includes a third clamping sleeve (204); The inner peripheral wall of the threaded sleeve (201) and the right end of the connecting sleeve (205) form a groove, and the third clamping sleeve (204) is embedded in the groove; the third clamping sleeve (204) is located on the left side of the liquid outlet (2011); The outer peripheral wall of the valve cone (203) is slidably connected to the inner peripheral wall of the threaded sleeve (201); when the valve cone (203) is in the initial position, the third clamping sleeve (204) forms a third sealing fit with the outer peripheral wall of the left end of the valve cone (203) to isolate the liquid outlet (2011) and the liquid inlet (2051).

7. The valve core assembly of the hydraulically controlled check valve for a hydraulic support column as described in claim 6, characterized in that, The push rod (202) includes a front end (2021), a frustum sealing part (2022), a connecting part (2023), a limiting part (2024), and a positioning part (2025) that are fixedly connected in sequence; the valve cone (203) is sleeved on the outer periphery of the front end (2021), the frustum sealing part (2022), and the connecting part (2023), and the valve cone (203) and the push rod (202) can slide relative to each other; a push rod return spring (2026) is sleeved on the outer periphery of the positioning part (2025), and the two ends of the push rod return spring (2026) abut against the limiting part (2024) and the threaded sleeve (201) respectively; The front end (2021) has a liquid passage; a gap is provided between the connecting part (2023) and the inner wall of the valve cone (203); When the push rod (202) is in the initial position, the front end (2021) protrudes from the left end of the valve cone (203), and the inner wall of the valve cone (203) forms a fourth sealing fit with the cone sealing part (2022) to isolate the pressure relief hole (2012) and the liquid inlet hole (2051); When the third stem portion (20623) of the valve stem (206) pushes the top rod (202) to the right and releases the fourth sealing engagement, the pressure relief hole (2012) communicates with the liquid inlet hole (2051) through the gap, the liquid passage, and the radial groove (20624).

8. The valve core assembly of the hydraulically controlled check valve for a hydraulic support column as described in claim 1, characterized in that, The plug (208) and the shell (207), the shell (207) and the connecting sleeve (205), and the connecting sleeve (205) and the sleeve (201) are connected and fixed by a first thread; the outer peripheral wall of the sleeve (201) is provided with a second thread; the first thread and the second thread have opposite directions of rotation.

9. The valve core assembly of the hydraulically controlled check valve for a hydraulic support column as described in claim 7, characterized in that, The first sealing fit, the second sealing fit, the third sealing fit, and the fourth sealing fit are all conical sealing fits; the conical sealing fit includes an inner conical surface and an outer conical surface that seal with each other; The range of the inner cone angle is 54°-72°, and the range of the outer cone angle is the inner cone angle +2-10°. Alternatively, the inner conical surface can be a circular arc surface.

10. A hydraulically controlled check valve for a hydraulic support column, characterized in that, Includes a valve body (1) and two valve core assemblies as described in any one of claims 1-9; The valve body (1) is provided with multiple control ports (K), two liquid inlets (P), and one liquid outlet (A). The control ports (K) are connected to the upper cavity of the column, and the liquid outlet (A) is connected to the lower cavity of the column. The control ports (K) are connected to the damping holes of the two valve core assemblies (2). The two liquid inlets (P) are provided with separate cavities and are not connected to each other. The two liquid inlets (P) are respectively connected to the liquid inlet holes (2051) of the two valve core assemblies (2). The pressure relief holes (2012) and the liquid outlet holes (2011) of the two valve core assemblies (2) are both connected to the liquid outlet (A).

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