Electro-hydraulic main valve cartridge valve string for coal mine

Abstract

The invention discloses an electro-hydraulic main valve cartridge valve string for a coal mine, which comprises a plug with an external thread and an end sleeve arranged on one side of the plug, and the plug is detachably connected with the end sleeve; a center through hole is formed in the center of the plug, an inner clamping jaw is arranged on the outer edge of the center through hole and arranged on the side wall of the side, close to the end sleeve, of the plug in a protruding mode, and the inner clamping jaw and the plug are integrally formed. A necking inner groove is formed in the side wall of the side, close to the plug, of the end sleeve and corresponds to the inner clamping jaw, and a fixing pin is detachably connected into a center through hole of the plug. The inner clamping jaw extends into the necking inner groove and expands outwards through the fixing pin so that the inner clamping jaw can be clamped in the necking inner groove in the expanding state. According to the split type electro-hydraulic main valve, the plug-in mounting performance and the flexibility of the split type electro-hydraulic main valve are guaranteed, friction damage of a sealing piece caused by mounting and rotating actions is avoided, and the sealing reliability of the whole electro-hydraulic main valve is improved.

Description

Technical Field

[0001] The invention relates to the field of hydraulic main valves, and in particular to an electro-hydraulic main valve cartridge valve string for coal mines. Background Art

[0002] The electro-hydraulic main valve is used in coal mine hydraulic supports to control the movement of the hydraulic supports. Therefore, its stability and reliability are of vital importance. At present, the existing electro-hydraulic main valve strings at home and abroad are all plug-in valve strings, and their screw plugs (including threaded parts) and end sleeves (including seals that contact and cooperate with the valve body) are integrated structures. The following problems exist during use: First, during the assembly and matching process of the electro-hydraulic main valve string and the valve body, due to the machining tolerance, the coaxiality of the inner hole of the valve body itself, the matching of the valve body and the end sleeve, the matching of the valve body and the valve sleeve, the matching of the end sleeve, the valve sleeve and the internal valve stem and piston and other parts containing seals and having a sealing function, a series of matching tolerances will be generated, which will affect the coaxial consistency between the various parts in the valve string and the valve body. Due to the existence of this tolerance dimension chain, after the valve string is assembled with the valve body, the position of the seal in contact with the valve body is in a fixed state, and the axial position cannot be fine-tuned. The parts containing seals in other valve strings interact with each other under high-pressure fluids and are prone to jamming; Second, in the cartridge valve string, when the valve string is assembled into the valve body, the rotating thread will inevitably cause friction damage to the seal, affecting the sealing effect of the seal; In summary, it is necessary to study a split-structure coal mine electro-hydraulic main valve cartridge valve string to solve the above problems. Summary of the invention

[0003] The object of the present invention is to provide a cartridge valve string of an electro-hydraulic main valve for coal mines, which can ensure coaxiality and reduce the influence of sticking, in view of the above problems.

[0004] In order to achieve the above object, the technical solution of the present invention is: A cartridge valve string of an electro-hydraulic main valve for coal mines comprises a screw plug with an external thread and an end sleeve arranged on one side of the screw plug, wherein the screw plug and the end sleeve are detachably connected; the screw plug and the end sleeve are both cylindrical in structure, a central through hole is arranged at the center of the screw plug, an inner clamping claw is arranged at the outer edge of the central through hole, the inner clamping claw is protrudingly arranged on the side wall of the screw plug close to the end sleeve and the two are integrally formed; a shrinking inner groove is arranged on the side wall of the end sleeve close to the screw plug, the shrinking inner groove is arranged corresponding to the inner clamping claw, and a fixing pin is detachably connected in the central through hole of the screw plug; the inner clamping claw extends into the shrinking inner groove and is expanded outward by the fixing pin, so that the inner clamping claw is engaged in the shrinking inner groove when in the expanded state.

[0005] Furthermore, the fixing pin is embedded in the center through hole, and one end of the fixing pin embedded in the center through hole is a conical structure. The inner diameter of the center through hole gradually decreases from the end farthest from the end sleeve to the end close to the end sleeve, so that the outward expansion distance of the inner claw is larger as the embedding length of the fixing pin increases.

[0006] Furthermore, a fixing protrusion is provided on one end of the end sleeve close to the screw plug, and the shrinkage inner groove is provided at the center position of the fixing protrusion; a fixing groove is provided on one side of the screw plug close to the end sleeve, and the center through hole is provided at the center position of the fixing groove; when the inner claw is engaged with the shrinkage inner groove, the fixing protrusion is embedded in the fixing groove.

[0007] Furthermore, a piston groove is provided inside the end of the end sleeve away from the screw plug, a piston is slidably connected in the piston groove and the piston can slide along the length direction of the end sleeve; a valve sleeve is provided on the outer side of the end of the end sleeve away from the screw plug, and the inner wall of one end of the valve sleeve is threadedly connected to the outer wall of one end of the end sleeve; the valve sleeve is a sleeve structure, a valve stem is provided inside the valve sleeve and the valve stem can slide along the length direction of the valve sleeve, and one end of the valve stem is embedded in the inner side of one end of the piston.

[0008] Furthermore, a first limiting convex ring is integrally formed on the inner wall of the valve sleeve, and a second limiting convex ring is integrally formed on the outer wall of the valve stem. The second limiting convex ring is located on one side of the first limiting convex ring, and the first limiting convex ring, the second limiting convex ring, the inner wall of the valve sleeve, and the outer wall of the valve stem together form a spring cavity. A spring is arranged in the spring cavity, and the spring sleeve is arranged on the outside of the valve stem. The axial ends of the spring are respectively abutted against the side walls of the first limiting convex ring and the second limiting convex ring.

[0009] Furthermore, a valve seat cavity is formed between the outer wall of one end of the piston, the second limiting convex ring, and the inner wall of the valve sleeve. A valve seat is arranged in the valve seat cavity. The valve seat sleeve is arranged between the inner wall of the valve sleeve and the outer wall of one end of the piston. One end of the valve seat contacts the side wall of the second limiting convex ring.

[0010] Furthermore, the position of the valve seat near the second limiting convex ring and the outer wall of one end of the piston are both set as inclined structures, and the position of the second limiting convex ring near the valve seat and the position of the outer wall of one end of the piston near the valve seat are also set as inclined structures. The inclined structure on the valve seat is adapted to the inclined structure on the piston and the second limiting convex ring and abuts against each other.

[0011] Furthermore, a sealing groove in a ring shape is arranged on the outer peripheral side wall of the end sleeve, and a first sealing ring is arranged on the outer side of the sealing groove, and the outer diameter of the first sealing ring is larger than the outer diameter of the valve sleeve.

[0012] Furthermore, a second sealing ring is arranged between the outer wall of the piston and the inner wall of the piston groove, between the outer wall of the valve seat and the inner wall of the valve sleeve, between the outer wall of the valve stem and the inner wall of the valve sleeve, and on the outer side wall of the valve sleeve.

[0013] Compared with the prior art, the present invention has the following advantages and positive effects: The present invention adopts a split design of screw plug and end sleeve, so that when performing the assembly operation, the end sleeve, valve sleeve, valve stem and piston are first assembled and installed in the valve body, and then the screw plug thread is connected with the valve body thread. After the thread connection, the inner clamping claw on the screw plug extends into the shrinking inner groove at the center of the end sleeve, and finally, the fixing pin is embedded in the center through hole. The fixing pin expands the inner clamping claw outward and makes the inner clamping claw engage with the shrinking inner groove after expansion, thereby realizing the assembly operation between the screw plug, the end sleeve and the valve body; the matching design of the inner clamping claw and the shrinking inner groove not only realizes the connection operation between the screw plug and the end sleeve, but also makes There is a certain axial movable gap between the two, and the axial movable gap can make each seal inside the valve string automatically correct under high pressure, thereby ensuring the consistency of coaxiality and avoiding the jamming of the parts containing seals inside the valve string, while reducing the impact on the threaded structure outside the screw plug, thereby improving the reliability of the performance of the electro-hydraulic main valve; and, the split valve string structure in the present invention ensures both its plug-in performance and its flexibility. The end sleeve does not need to be rotated during installation, and the seal will not be damaged by friction due to the installation rotation action, thereby improving the sealing reliability of the entire electro-hydraulic main valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 for Figure 1 A magnified view of the local structure at position A in the middle; Figure 3 for Figure 1 A magnified view of the local structure at position B in the middle; Figure 4 This is a cross-sectional structural diagram of the screw plug. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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, any modifications, equivalent substitutions, improvements, etc., should be included in the protection scope of the present invention.

[0017] like Figures 1 to 4 As shown, this embodiment discloses an electro-hydraulic main valve cartridge valve string for coal mines, including a screw plug 1 provided with an external thread and an end sleeve 2 provided on one side of the screw plug 1, wherein the screw plug 1 and the end sleeve 2 are detachably connected; the screw plug 1 and the end sleeve 2 are both cylindrical structures, a central through hole 101 is provided at the center of the screw plug 1, an inner clamping claw 102 is provided at the outer edge of the central through hole 101, the inner clamping claw 102 has a certain elastic deformation ability, and the inner clamping claw 102 is protruding and provided on the screw plug 1 near the end sleeve 2 and the two are integrally formed; a shrinking inner groove 201 is provided on the side wall of the end sleeve 2 close to the screw plug 1, and the shrinking inner groove 201 is provided corresponding to the inner clamping claw 102, and a fixing pin 3 is inserted into the central through hole 101 of the screw plug 1; the inner clamping claw 102 extends into the shrinking inner groove 201 and is expanded outward by the fixing pin 3, so that the buckle structure on the outer edge of the inner clamping claw 102 is engaged in the shrinking inner groove 201 when in the expanded state.

[0018] The fixing pin 3 is embedded in the central through hole 101. One end of the fixing pin 3 embedded in the central through hole 101 is a conical structure. The inner diameter of the central through hole 101 gradually decreases from the end far away from the end sleeve 2 to the end close to the end sleeve 2, so that the outward expansion distance of the inner claw 102 is larger as the embedding length of the fixing pin 3 increases.

[0019] A fixing protrusion 202 is provided at one end of the end sleeve 2 close to the screw plug 1, and the shrinkage inner groove 201 is arranged at the center position of the fixing protrusion 202; a fixing groove 103 is provided on one side of the screw plug 1 close to the end sleeve 2, and the center through hole 101 is arranged at the center position of the fixing groove 103; when the inner claw 102 is engaged with the shrinkage inner groove 201, the fixing protrusion 202 is embedded in the fixing groove 103.

[0020] A piston groove 204 is provided inside the end of the end sleeve 2 away from the screw plug 1, and a piston 4 is slidably connected in the piston groove 204 and can slide along the length direction of the end sleeve 2; a valve sleeve 5 is provided on the outer side of the end of the end sleeve 2 away from the screw plug 1, and the inner wall of one end of the valve sleeve 5 is threadedly connected to the outer wall of one end of the end sleeve 2; the valve sleeve 5 is a sleeve structure, and a valve stem 6 is provided inside the valve sleeve 5 and the valve stem 6 can slide along the length direction of the valve sleeve 5, and one end of the valve stem 6 is embedded in the inner side of one end of the piston 4.

[0021] The inner wall of the valve sleeve 5 is integrally formed with a first limiting convex ring 501, and the outer wall of the valve stem 6 is integrally formed with a second limiting convex ring 601. The second limiting convex ring 601 is located on one side of the first limiting convex ring 501, and the first limiting convex ring 501, the second limiting convex ring 601, the inner wall of the valve sleeve 5, and the outer wall of the valve stem 6 together form a spring cavity 8. A spring 9 is arranged in the spring cavity 8, and the spring 9 is sleeved on the outside of the valve stem 6. The axial ends of the spring 9 are respectively abutted against the side walls of the first limiting convex ring 501 and the second limiting convex ring 601.

[0022] A valve seat cavity 10 is formed between the outer wall of one end of the piston 4, the second limiting convex ring 601, and the inner wall of the valve sleeve 5. A valve seat 7 is arranged in the valve seat cavity 10. The valve seat 7 is sleeved between the inner wall of the valve sleeve 5 and the outer wall of one end of the piston 4. One end of the valve seat 7 contacts the side wall of the second limiting convex ring 601.

[0023] The main improved structure of the technical solution is the split connection structure of the screw plug and the end sleeve. The coordinated control structure between the valve stem, the piston and the valve body inside the valve string is completely consistent with the working principle of the valve string in the prior art. It controls the connectivity between the liquid inlet chamber and the liquid return chamber in the valve body through the movement of the valve stem and the piston, thereby completing the control of different oil paths in the reversing valve string and realizing the reversing control effect of the reversing valve string.

[0024] The position of the valve seat 7 near the second limiting convex ring 601 and the outer wall of one end of the piston 4 are both set as inclined structures, and the position of the second limiting convex ring 601 near the valve seat 7 and the outer wall of one end of the piston 4 near the valve seat 7 are also set as inclined structures. The inclined structure on the valve seat 7 is adapted to the inclined structure on the piston 4 and the second limiting convex ring 601 and abuts against each other.

[0025] The outer peripheral side wall of the end sleeve 2 is provided with a ring-shaped sealing groove, and a first sealing ring 203 is sleeved outside the sealing groove. The outer diameter of the first sealing ring 203 is greater than the outer diameter of the valve sleeve 5.

[0026] A second sealing ring 11 is arranged between the outer wall of the piston 4 and the inner wall of the piston groove 204 , between the outer wall of the valve seat 7 and the inner wall of the valve sleeve 5 , between the outer wall of the valve stem 6 and the inner wall of the valve sleeve 5 , and on the outer side wall of the valve sleeve 5 .

[0027] The present invention adopts a split design of screw plug and end sleeve, so that when performing the assembly operation, the end sleeve, valve sleeve, valve stem and piston are first assembled and installed in the valve body, and then the screw plug thread is connected with the valve body thread. After the thread connection, the inner clamping claw on the screw plug extends into the shrinking inner groove at the center of the end sleeve, and finally, the fixing pin is embedded in the center through hole. The fixing pin expands the inner clamping claw outward and makes the inner clamping claw engage with the shrinking inner groove after expansion, thereby realizing the assembly operation between the screw plug, the end sleeve and the valve body; the matching design of the inner clamping claw and the shrinking inner groove not only realizes the connection operation between the screw plug and the end sleeve, but also makes There is a certain axial movable gap between the two, and the axial movable gap can make each seal inside the valve string automatically correct under high pressure, thereby ensuring the consistency of coaxiality and avoiding the jamming of the parts containing seals inside the valve string, while reducing the impact on the threaded structure outside the screw plug, thereby improving the reliability of the performance of the electro-hydraulic main valve; and, the split valve string structure in the present invention ensures both its plug-in performance and its flexibility. The end sleeve does not need to be rotated during installation, and the seal will not be damaged by friction due to the installation rotation action, thereby improving the sealing reliability of the entire electro-hydraulic main valve.

Claims

1. An electro-hydraulic main valve cartridge valve string for coal mines, comprising a screw plug provided with an external thread and an end sleeve provided on one side of the screw plug, characterized in that: The screw plug is detachably connected to the end sleeve; the screw plug and the end sleeve are both cylindrical structures, a central through hole is provided at the center of the screw plug, an inner clamping claw is provided at the outer edge of the central through hole, the inner clamping claw is protrudingly provided on the side wall of the screw plug close to the end sleeve and the two are integrally formed; a shrinking inner groove is provided on the side wall of the end sleeve close to the screw plug, the shrinking inner groove is provided corresponding to the inner clamping claw, and a fixing pin is detachably connected to the central through hole of the screw plug; the inner clamping claw extends into the shrinking inner groove and is expanded outward by the fixing pin, so that the inner clamping claw is engaged in the shrinking inner groove when in the expanded state.

2. The electro-hydraulic main valve cartridge valve train for coal mines according to claim 1, characterized in that: The fixing pin is embedded in the center through hole, and one end of the fixing pin embedded in the center through hole is a tapered structure. The inner diameter of the center through hole gradually decreases from the end farthest from the end sleeve to the end close to the end sleeve, so that the outward expansion distance of the inner claw is larger as the embedding length of the fixing pin increases.

3. The electro-hydraulic main valve cartridge valve train for coal mines according to claim 2, characterized in that: A fixing protrusion is arranged at one end of the end sleeve close to the screw plug, and the shrinkage inner groove is arranged at the center position of the fixing protrusion; a fixing groove is arranged at one side of the screw plug close to the end sleeve, and the center through hole is arranged at the center position of the fixing groove; when the inner claw is engaged with the shrinkage inner groove, the fixing protrusion is embedded in the fixing groove.

4. The electro-hydraulic main valve cartridge valve train for coal mines as claimed in claim 3, characterized in that: A piston groove is provided inside the end of the end sleeve away from the screw plug, and a piston is slidably connected in the piston groove and can slide along the length direction of the end sleeve; a valve sleeve is provided on the outer side of the end of the end sleeve away from the screw plug, and the inner wall of one end of the valve sleeve is threadedly connected to the outer wall of one end of the end sleeve; the valve sleeve is a sleeve structure, and a valve stem is provided inside the valve sleeve and can slide along the length direction of the valve sleeve, and one end of the valve stem is embedded in the inner side of one end of the piston.

5. The electro-hydraulic main valve cartridge valve train for coal mines according to claim 4, characterized in that: The inner wall of the valve sleeve is integrally formed with a first limiting convex ring, and the outer wall of the valve stem is integrally formed with a second limiting convex ring. The second limiting convex ring is located on one side of the first limiting convex ring, and the first limiting convex ring, the second limiting convex ring, the inner wall of the valve sleeve and the outer wall of the valve stem together form a spring cavity. A spring is arranged in the spring cavity, and the spring sleeve is arranged on the outside of the valve stem. The axial ends of the spring are respectively abutted against the side walls of the first limiting convex ring and the second limiting convex ring.

6. The electro-hydraulic main valve cartridge valve train for coal mines according to claim 5, characterized in that: A valve seat cavity is formed between the outer wall of one end of the piston, the second limiting convex ring, and the inner wall of the valve sleeve. A valve seat is arranged in the valve seat cavity. The valve seat sleeve is arranged between the inner wall of the valve sleeve and the outer wall of one end of the piston. One end of the valve seat contacts the side wall of the second limiting convex ring.

7. The electro-hydraulic main valve cartridge valve train for coal mines according to claim 6, characterized in that: The position of the valve seat near the second limiting convex ring and the outer wall of one end of the piston are both set as inclined structures, and the position of the second limiting convex ring near the valve seat and the position of the outer wall of one end of the piston near the valve seat are also set as inclined structures. The inclined structure on the valve seat is adapted to the inclined structure on the piston and the second limiting convex ring and abuts against each other.

8. The electro-hydraulic main valve cartridge valve train for coal mines according to claim 7, characterized in that: The outer peripheral side wall of the end sleeve is provided with a ring-shaped sealing groove, and a first sealing ring is sleeved outside the sealing groove. The outer diameter of the first sealing ring is greater than the outer diameter of the valve sleeve.

9. The electro-hydraulic main valve cartridge valve train for coal mines according to claim 8, characterized in that: A second sealing ring is arranged between the outer wall of the piston and the inner wall of the piston groove, between the outer wall of the valve seat and the inner wall of the valve sleeve, between the outer wall of the valve stem and the inner wall of the valve sleeve, and on the outer wall of the valve sleeve.

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