Plug-in mounting type high-flow hydraulic control one-way valve structure with adjustable pilot ratio

Abstract

The invention relates to the technical field of hydraulic control one-way valves, and discloses a plug-in type pilot-ratio-adjustable large-flow hydraulic control one-way valve structure which comprises a pilot valve block and a main valve element. The pilot valve block is provided with a protective cap, one end of the protective cap is provided with a first base, and the interior of the first base is movably connected with a limiting rod; a guide plunger is connected to one end of the limiting rod in a contact mode, an ejector rod is connected to the bottom of one end of the rotating lever in a contact mode, a steel ball is connected to the bottom of the ejector rod in a contact mode, the steel ball is movably connected to the interior of a second base, and a third reset spring is arranged in the second base. The pilot valve block is of a unique mechanical structure, and the control pilot ratio of the hydraulic control one-way valve is changed by adjusting the limiting rod. The two-way cartridge valve is adopted as the main valve element, the characteristic of high flow capacity of the two-way cartridge valve is fully played, the problem of large flow is solved, and the designed flow can reach 5000 L / min.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulically controlled one-way valves, in particular to a plug-in type hydraulically controlled one-way valve structure with adjustable pilot ratio and large flow rate. Background Art

[0002] A hydraulically controlled check valve is a special check valve that allows free flow of fluid in one direction, but requires hydraulic control to achieve reverse flow in the other direction. This valve has important applications in hydraulic systems, especially in situations where precise control of fluid flow direction and pressure maintenance are required.

[0003] The working principle of the hydraulically controlled check valve is based on hydraulic control. When the control oil circuit is not connected to the pressure oil, the hydraulically controlled check valve works like an ordinary check valve. The pressure oil only flows from the oil inlet to the oil outlet and cannot flow in the opposite direction. When the pilot valve block control oil circuit X port has control pressure input, the piston push rod moves to the right under the action of the pressure oil, and the push rod pushes the check valve open, so that the main valve core spring chamber is connected to the pilot valve block drain port Y port. At this time, the main valve core oil outlet can flow to the oil inlet.

[0004] The flow rate of hydraulic systems currently used in high-power ships is often as high as 1000L / min or above. When the system needs to use a hydraulically controlled one-way valve and has high requirements for the pilot control ratio, conventional products on the market cannot be used, and cannot balance the flow capacity and circuit volume problems, let alone solve the problem of adjusting the pilot ratio of the hydraulically controlled one-way valve. Summary of the invention

[0005] In order to solve the technical problems that the existing flow capacity and circuit volume cannot be balanced, and the pilot ratio adjustment problem of the hydraulically controlled one-way valve is controlled, the present invention provides a plug-in type large-flow hydraulically controlled one-way valve structure with adjustable pilot ratio.

[0006] The present invention is implemented by the following technical scheme: a plug-in type adjustable pilot ratio large flow hydraulically controlled one-way valve structure, comprising a pilot valve block (1) and a main valve core (2), one end of the pilot valve block (1) is provided with a protective cap (25), one end of the protective cap (25) is provided with a first base (3), the interior of the first base (3) is movably connected to a limit rod (4), one end of the limit rod (4) is contact-connected to a guide plunger (6), the guide plunger (6) is movably connected to the interior of the pilot valve block (1), and is contact-connected to the guide plunger (6) via an anti-rotation screw (5), so that the rotating guide plunger (6) cannot rotate during movement, the other end of the pilot valve block (1) is fixedly connected to a first mounting seat (10), and the interior of the first mounting seat (10) is provided with a first return spring (8); The middle part of the guide plunger (6) is fixedly connected to a guide seat (7), the bottom end of the guide seat (7) is internally movably connected to a pilot plunger rod (12), the bottom end of the pilot plunger rod (12) is internally movably connected to a pilot push rod (13), one end of the pilot push rod (13) is contact-connected to a rotating lever (14), one end of the rotating lever (14) is pin-connected to the inside of the pilot valve block (1) via a rotating pin (15), and a second return spring (16) is provided at the bottom of the other end of the rotating lever (14); Secondly, one end of the rotating lever (14) is contact-connected to a push rod (17) at the bottom, and a steel ball (24) is contact-connected to the bottom of the push rod (17). A second base (18) is arranged inside the pilot valve block (1), and the steel ball (24) is movably connected to the inside of the second base (18). A third return spring (20) is arranged inside the second base (18), and the top end of the third return spring (20) is contact-connected to the bottom of the steel ball (24). A two-way valve cover plate (34) is arranged on the top of the main valve core (2), a two-way valve sleeve (28) is arranged inside the main valve core (2), and the two-way valve sleeve (28) is movably connected to the two-way valve core (27). A fourth return spring (26) is arranged inside the two-way valve core (27), and a two-way valve cover plate (34) is arranged on the top of the two-way valve sleeve (28).

[0007] Preferably, a control port X oil port is provided at one end of the pilot valve block (1), an oil drain port Y oil port is provided at the bottom of the pilot valve block (1), an oil port B oil port is provided radially of the main valve core (2), and an oil port A oil port is provided at the bottom of the pilot valve block (1).

[0008] Preferably, the area of ​​the two-way valve core (27) acted on by the pressure oil of the A oil port is AA; the area of ​​the spring cavity of the two-way valve core (27) is AAP; the annular area formed by the pressure oil of the B oil port acting on the two-way valve core (27) and the two-way valve sleeve (28) is AB; wherein the AA area = the AB area, and the AAP area: the AA area = 2:1.

[0009] Preferably, one end of the first return spring (8) is contact-connected to the other end of the guide plunger (6), and the other end of the first return spring (8) is contact-connected inside the first mounting seat (10).

[0010] Preferably, the other end of the rotating lever (14) is contact-connected with a second return spring (16), and the second return spring (16) is installed inside the pilot valve block (1).

[0011] Preferably, an anti-rotation screw (5) is fixedly connected to the internal top of the pilot valve block (1), and a guide plunger (6) is contact-connected to the bottom of the anti-rotation screw (5), so that the guide plunger (6) cannot rotate during movement.

[0012] Preferably, the push rod (17) is installed in the hole of the pilot valve block (1) through its outer cylindrical surface, the outer cylindrical surface of the push rod (17) is matched with the hole of the pilot valve block (1) and can move freely along its axial direction, and the outer cylindrical surface of the push rod (17) is also provided with two symmetrical countersunk surfaces, and the gap between the two countersunk surfaces of the outer cylindrical surface of the push rod (17) and the inner hole of the pilot valve block (1) forms an oil path, which is used to realize the connection between the spring cavity of the second base (18) and the oil port of the oil drain port Y after the steel ball (24) is pushed open, and plays a hydraulic damping role during the connection process.

[0013] Preferably, a first O-ring (9) is arranged inside the first mounting seat (10), a second O-ring (11) is arranged inside the guide seat (7), the bottom of the second base (18) is fixedly connected to the second mounting seat (22), a first retaining ring (19) is arranged outside the second base (18), a third O-ring (23) is arranged outside the second base (18), the third O-ring (23) is located below the first retaining ring (19), and a hole retaining ring (21) is arranged at the bottom of the second mounting seat (22), and the hole retaining ring (21) is fixed inside the pilot valve block (1).

[0014] Preferably, a second retaining ring (29) and a fourth O-ring (30) are provided at the external top end of the two-way valve sleeve (28), and a third retaining ring (31) and a fifth O-ring (32) are provided at the external bottom end of the two-way valve sleeve (28).

[0015] Preferably, a plurality of first cover plate mounting screws (33) are arranged around the two-way valve cover plate (34), a plurality of second valve block mounting screws (35) are arranged around the pilot valve block (1), and a plurality of third mounting seat screws (36) are arranged on one side of the first mounting seat (10).

[0016] Compared with the prior art, the present invention has the following beneficial effects: When in use, the present invention is composed of a two-stage structure consisting of a pilot valve block and a main valve core. The pilot valve block adopts a unique mechanical structure and changes the control pilot ratio of the hydraulically controlled one-way valve by adjusting the limit rod; the main valve core adopts a two-way cartridge valve to give full play to its strong flow capacity and solve the problem of large flow. The designed flow rate of the present invention can reach 5000L / min. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2It is a schematic diagram of the internal structure of the pilot valve block of the present invention; Figure 3 It is an overall explosion schematic diagram of the present invention; Figure 4 For the present invention Figure 3 The enlarged schematic diagram of the middle A part; Figure 5 It is a schematic diagram of the separate structure of the two-way valve core and the two-way valve sleeve of the present invention; Figure 6 It is a cross-sectional view of a two-way valve core and a two-way valve sleeve of the present invention; Figure 7 It is a schematic diagram of the annular area formed by the pressure oil of the B oil port of the present invention acting on the two-way valve core and the two-way valve sleeve; Figure 8 It is a schematic diagram of the pilot control ratio adjustment principle structure of the present invention; Fig. 9 It is a schematic diagram of the graphic symbols of the present invention.

[0018] In the figure: 1, pilot valve block; 2, main valve core; 3, first base; 4, limit rod; 5, anti-rotation screw; 6, guide plunger; 7, guide seat; 8, first return spring; 9, first O-ring; 10, first mounting seat; 11, second O-ring; 12, pilot plunger rod; 13, pilot push rod; 14, rotating lever; 15, rotating pin; 16, second return spring; 17, push rod; 18, second base; 19, first retaining ring; 20 , third return spring; 21, retaining ring for hole; 22, second mounting seat; 23, third O-ring; 24, steel ball; 25, protective cap; 26, fourth return spring; 27, two-way valve core; 28, two-way valve sleeve; 29, second retaining ring; 30, fourth O-ring; 31, third retaining ring; 32, fifth O-ring; 33, first cover plate mounting screw; 34, two-way valve cover; 35, second valve block mounting screw; 36, third mounting seat screw. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0020] Example 1: Please refer to Figure 1 - Fig. 9The present embodiment provides a plug-in type adjustable pilot ratio large flow hydraulically controlled one-way valve structure, comprising a pilot valve block (1) and a main valve core (2), wherein one end of the pilot valve block (1) is provided with a protective cap (25), one end of the protective cap (25) is provided with a first base (3), the interior of the first base (3) is movably connected to a limit rod (4), one end of the limit rod (4) is contact-connected to a guide plunger (6), the guide plunger (6) is movably connected to the interior of the pilot valve block (1), and is contact-connected to the guide plunger (6) via an anti-rotation screw (5), The guide piston (6) cannot rotate during the movement process. The other end of the pilot valve block (1) is fixedly connected to a first mounting seat (10). A first return spring (8) is arranged inside the first mounting seat (10). The first base 3 is fixed to the pilot valve block 1 by threads. The first base 3 is provided with an ED sealing ring to prevent oil leakage between the first base 3 and the pilot valve block 1. The limit rod 4 is connected to the first base 3 by fine threads to form an axially adjustable mechanism. The protective cap 25 is used to lock the limit rod 4. The protective cap 25 and the first base 3 are sealed with an O-ring to prevent leakage. Furthermore, one end of the rotating lever (14) is contact-connected to a push rod (17) at the bottom, and a steel ball (24) is contact-connected to the bottom of the push rod (17). A second base (18) is provided inside the pilot valve block (1), and the steel ball (24) is movably connected to the inside of the second base (18). A third return spring (20) is provided inside the second base (18), and the top end of the third return spring (20) is contact-connected to the bottom of the steel ball (24). A two-way valve cover plate (34) is provided on the top of the main valve core (2), a two-way valve sleeve (28) is provided inside the main valve core (2), and the inside of the two-way valve sleeve (28) is movably connected to the two-way valve core (27), a fourth return spring (26) is provided inside the two-way valve core (27), and a two-way valve cover plate (34) is provided on the top of the two-way valve sleeve (28); Among them, the middle cylindrical section of the top rod 17 is as follows Figure 2 As shown, planes are symmetrically machined on both sides of the cylindrical surface, and the clearance between the cylindrical surface and the hole of the pilot valve block 1 plays a guiding role, so that the push rod 17 can move along its axial direction and keep the force arm L1 unchanged; the planes are symmetrically machined on both sides, and when the push rod 17 pushes the steel ball 24, it plays an oil-passing function, and connects the oil in the spring chamber of the two-way valve core 27 to the Y oil port; the front end of the push rod 17 is a spherical surface, which ensures that the push rod 17 is well stressed; the small cylindrical surface and the rear end surface of the push rod 17 ensure that only the torque is transmitted to the steel ball 24 during the movement; In some examples, a control port X oil port is provided at one end of the pilot valve block 1, a drain port Y oil port is provided at the bottom of the pilot valve block 1, a B oil port is provided in the radial direction of the main valve core 2, and an A oil port is provided at the bottom of the pilot valve block 1; Furthermore, the area of ​​the two-way valve core (27) acted on by the pressure oil of the A oil port is AA; the area of ​​the spring cavity of the two-way valve core (27) is AAP; the annular area formed by the pressure oil of the B oil port acting on the two-way valve core (27) and the two-way valve sleeve (28) is AB; wherein the AA area = the AB area, and the AAP area: the AA area = 2:1; The working process of the present invention is as follows: 1) One-way function: When there is no pressure at both X and Y ports, the pressure oil at port A acts on the area AA of the two-way valve core 27, and the two-way valve core 27 overcomes the spring force of the fourth return spring 26 and moves upward, and the oil flows freely from the bottom of the two-way valve sleeve 28 through the radial hole from port A to port B; 2) Locking function: By installing the main valve core 2 and the two-way valve cover plate 34, Figure 1 As shown in the oil circuit connection, the pressure oil of the oil port B acts on the spring cavity area AAP of the two-way valve core 27. The two-way valve core 27 is subjected to the pressure of the oil port B and the spring force of the fourth return spring 26, and is in close contact with the two-way valve sleeve 28 downward, forming a line seal at the contact position to achieve a locking function and zero leakage; the pressure oil of the oil port B also acts on the steel ball 24. The steel ball 24 is subjected to the pressure of the oil port B and the spring force of the third return spring 20, and is in close contact with the second base 18, forming a line seal at the contact position to achieve zero leakage; the oil port B cannot flow freely to the oil port A; 3) Hydraulic control function: To realize the flow of oil from port B to port A, control oil is introduced into port X of the pilot, and oil is returned to port Y. When the product of the control oil pressure introduced into port X and the control pilot ratio is greater than the pressure of port B (a necessary condition for opening), the control oil pressure of port X acts on the pilot push rod 13, and the pilot push rod 13 pushes the rotating lever 14 to rotate around the rotating pin 15. The rotating lever 14 rotating around the rotating pin 15 pushes the push rod 17, and the front end of the push rod 17 contacts the steel ball 24, thereby opening the line seal between the steel ball 24 and the second base 18, and port B is opened. The pressure oil is connected to the Y oil port through the oil circuit formed by the second mounting seat 22, the second base 18, the push rod 17 and the pilot valve block 1, causing the spring chamber pressure of the two-way valve core 27 to be less than the pressure of the B oil port. The pressure oil of the B oil port acts on the annular area AB formed by the two-way valve core 27 and the two-way valve sleeve 28. The two-way valve core 27 will overcome the spring force of the fourth return spring 26 and move upward, opening the line seal formed by the two-way valve core 27 and the two-way valve sleeve 28 at the contact position, and the oil flows from the radial hole of the two-way valve sleeve 28 to the bottom hole, realizing the free flow of the B oil port and the A oil port; 4) Adjustment and control of pilot ratio function: the guide seat 7 is fixed to the guide plunger 6 through the pilot plunger rod 12. Under the action of the first return spring 8 or the control pressure of the X oil port, the guide plunger 6 is always subjected to the left axial force, and the left end face of the guide plunger 6 is closely attached to the spherical surface of the limit rod 4. Therefore, the axial position of the guide plunger 6 in the pilot valve block 1 will be determined by the limit rod 4. By moving the limit rod 4 to the left or right, the control pilot ratio of the present invention can be changed; Furthermore, an anti-rotation screw 5 is fixedly connected to the top of the inner part of the pilot valve block 1, and a guide plunger 6 is contact-connected to the bottom of the anti-rotation screw 5. By providing the anti-rotation screw 5, the movement of the guide plunger 6 is limited to prevent the guide plunger 6 from rotating. Further, a first O-ring 9 is disposed inside the first mounting seat 10, a second O-ring 11 is disposed inside the guide seat 7, a second mounting seat 22 is fixedly connected to the bottom of the second base 18, a first retaining ring 19 is disposed outside the second base 18, a third O-ring 23 is disposed outside the second base 18, the third O-ring 23 is located below the first retaining ring 19, a hole retaining ring 21 is disposed at the bottom of the second mounting seat 22, the hole retaining ring 21 is fixed inside the pilot valve block 1, a second retaining ring 29 and a fourth O-ring 30 are disposed at the external top end of the two-way valve sleeve 28, and a third retaining ring 31 and a fifth O-ring 32 are disposed at the external bottom end of the two-way valve sleeve 28; Among them, a first O-ring 9, a second O-ring 11, a third O-ring 23, a fourth O-ring 30 and a fifth O-ring 32 are provided. The O-ring is an annular seal, usually made of rubber or other elastic materials. The main function of the O-ring is to form a seal between two surfaces to prevent fluid leakage; a first retaining ring 19, a hole retaining ring 21, a second retaining ring 29 and a third retaining ring 31 are provided. The retaining rings are used to withstand the oil port pressure to prevent the O-ring from being damaged due to high pressure or pulsating pressure.

[0021] Furthermore, a plurality of first cover plate mounting screws 33 are arranged around the two-way valve cover plate 34, and the two-way valve cover plate 34 can be fixed by the plurality of first cover plate mounting screws 33; a plurality of second valve block mounting screws 35 are arranged around the pilot valve block 1, and the pilot valve block 1 can be fixed by the plurality of second valve block mounting screws 35; a plurality of third mounting seat screws 36 are arranged on one side of the first mounting seat 10, and the first mounting seat 10 can be fixed by the plurality of third mounting seat screws 36.

[0022] Embodiment 2: Based on Embodiment 1, this embodiment introduces the specific structure of the guide plunger 6 and the guide seat 7. The middle part of the guide plunger 6 is fixedly connected with the guide seat 7, the bottom end of the guide seat 7 is internally movably connected with the pilot plunger rod 12, the bottom end of the pilot plunger rod 12 is internally movably connected with the pilot push rod 13, one end of the pilot push rod 13 is contact-connected with a rotating lever 14, one end of the rotating lever 14 is pin-connected to the inside of the pilot valve block 1 through a rotating pin 15, and the other end of the rotating lever 14 is provided with a second return spring 16 at the bottom; The guide seat 7 and the outer cylindrical surface of the guide plunger 6 are gap-matched, the guide seat 7 is threadedly connected with the pilot plunger rod 12, the pilot plunger rod 12 and the radial blind hole of the guide plunger 6 are gap-matched, and a second O-ring 11 is sealed at the gap-matching position, and the guide seat 7 is fixed to the guide plunger 6 through the pilot plunger rod 12; Secondly, in the hydraulic control function, the line seal formed by the two-way valve core 27 and the two-way valve sleeve 28 at the contact position needs to be opened, and the oil flows from the radial hole of the two-way valve sleeve 28 to the bottom hole to achieve free flow between the oil port B and the oil port A. The key is to achieve that the spring chamber pressure of the two-way valve core 27 is less than the pressure of the oil port B, so it is necessary to open the line seal between the steel ball 24 and the second base 18; like Figure 8 As shown, the present invention utilizes a rotating lever 14 that can rotate around a rotating pin 15 to form a set of levers, and the position of the rotating lever 14 is determined by the state of the force it is subjected to; When there is no control pressure at the X oil port, the pilot push rod 13 does not exert force on the rotating lever 14, the steel ball 24 is in contact with the second base 18 under the pressure of the B oil port, and the push rod 17 is installed on the pilot valve block 25 and can move slightly along its axial direction (a small moving position is left in its axial direction during design), so the push rod 17 does not exert force on the rotating lever 14, and the rotating lever 14 is tightly attached to the pilot push rod 13 under the action of the second return spring 16 (the second return spring 16 only plays a return role, which can be ignored compared with the hydraulic pressure); When there is a control pressure PX at the X oil port, the control pressure acts on the pilot push rod 13, and applies a force F2=PX•S2 to the rotating lever 14 through the effective area S2 of the pilot push rod 13. The force arm of the pilot push rod 13 on the rotating lever 14 is L2, so the rotating lever 14 is subjected to a torque M2=F2•L2; driven by the torque M2, the rotating lever 14 rotates around the rotating pin 15, and at this time, the push rod 17 is pushed to move axially until the push rod 17 is pushed to contact the steel ball 24; under the action of the oil pressure at the B oil port, the steel ball 24 is subjected to a liquid pressure of F1=PB•S1, and the rotating lever 14 needs to overcome a torque of M1=F1•L1 to open the line seal between the steel ball 24 and the second base 18, so that the spring chamber pressure of the two-way valve core 27 is less than the pressure at the B oil port, and the free flow between the B oil port and the A oil port is completed; From the force analysis, it can be seen that when M1≦M2, free flow between oil port B and oil port A can be achieved; That is: PB•S1•L1≦PX•S2•L2; Therefore, the ratio of PB / PX must be less than or equal to (S2•L2) / (S1•L1); Areas S1 and S2 are determined by the mechanical dimensions, and in the present invention, S2 = 2•S1; Therefore, the ratio of PB / PX must be less than or equal to (2•L2) / L1; The lever arm L1 is a fixed value; since the plunger 6 can move along its axial direction and the axial position is determined by the limit rod 4, the lever arm L2 is a variable value, which changes according to the different adjustment positions of the limit rod 4. In the present invention, the minimum value of L2 is 2 times of L1, and the maximum value of L2 is 4.5 times of L1; In summary: the control pilot ratio of the present invention is between 2.2 and 2.4.5, that is: 4 to 9. Working principle: The present invention is composed of a two-stage structure of a pilot valve block 1 + a main valve core 2. The control pilot ratio of the hydraulically controlled one-way valve is changed by adjusting the limit rod 4. The main valve core 2 adopts a two-way cartridge valve to give full play to its strong flow capacity and solve the problem of large flow. The designed flow rate of the present invention can reach 5000L / min.

[0023] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A plug-in type adjustable pilot ratio large flow hydraulically controlled one-way valve structure, comprising a pilot valve block (1) and a main valve core (2), characterized in that: A protective cap (25) is provided at one end of the pilot valve block (1), a first base (3) is provided at one end of the protective cap (25), a limiting rod (4) is movably connected inside the first base (3), one end of the limiting rod (4) is contact-connected with a guide plunger (6), the guide plunger (6) is movably connected inside the pilot valve block (1), and contact-connected with the guide plunger (6) via an anti-rotation screw (5), so that the guide plunger (6) cannot rotate during the movement process, and the other end of the pilot valve block (1) is fixedly connected with a first mounting seat (10), and a first return spring (8) is provided inside the first mounting seat (10); The middle part of the guide plunger (6) is fixedly connected to a guide seat (7), the bottom end of the guide seat (7) is internally movably connected to a pilot plunger rod (12), the bottom end of the pilot plunger rod (12) is internally movably connected to a pilot push rod (13), one end of the pilot push rod (13) is contact-connected to a rotating lever (14), one end of the rotating lever (14) is pin-connected to the inside of the pilot valve block (1) via a rotating pin (15), and a second return spring (16) is provided at the bottom of the other end of the rotating lever (14); Secondly, one end of the rotating lever (14) is contact-connected to a push rod (17) at the bottom, and a steel ball (24) is contact-connected to the bottom of the push rod (17). A second base (18) is arranged inside the pilot valve block (1), and the steel ball (24) is movably connected to the inside of the second base (18). A third return spring (20) is arranged inside the second base (18), and the top end of the third return spring (20) is contact-connected to the bottom of the steel ball (24). A two-way valve cover plate (34) is arranged on the top of the main valve core (2), a two-way valve sleeve (28) is arranged inside the main valve core (2), and the two-way valve sleeve (28) is movably connected to the two-way valve core (27). A fourth return spring (26) is arranged inside the two-way valve core (27), and a two-way valve cover plate (34) is arranged on the top of the two-way valve sleeve (28).

2. According to claim 1, a plug-in type adjustable pilot ratio large flow hydraulically controlled one-way valve structure is characterized in that: A control port X is provided at one end of the pilot valve block (1), an oil drain port Y is provided at the bottom of the pilot valve block (1), an oil port B is provided in the radial direction of the main valve core (2), and an oil port A is provided at the bottom of the pilot valve block (1).

3. A plug-in type adjustable pilot ratio large flow hydraulically controlled one-way valve structure according to claim 2, characterized in that: The area of ​​the two-way valve core (27) acted on by the pressure oil at the A oil port is AA; the area of ​​the spring chamber of the two-way valve core (27) is AAP; the annular area formed by the pressure oil at the B oil port acting on the two-way valve core (27) and the two-way valve sleeve (28) is AB; wherein the AA area = the AB area, and the AAP area: the AA area = 2:

1.

4. The plug-in type adjustable pilot ratio large flow hydraulically controlled one-way valve structure according to claim 1 is characterized in that: One end of the first return spring (8) is contact-connected to the other end of the guide plunger (6), and the other end of the first return spring (8) is contact-connected inside the first mounting seat (10).

5. The plug-in type adjustable pilot ratio large flow hydraulically controlled one-way valve structure according to claim 1 is characterized in that: The other end of the rotating lever (14) is contact-connected with a second return spring (16), and the second return spring (16) is installed inside the pilot valve block (1).

6. The plug-in type adjustable pilot ratio large flow hydraulically controlled one-way valve structure according to claim 1 is characterized in that: An anti-rotation screw (5) is fixedly connected to the internal top of the pilot valve block (1), and a guide plunger (6) is contact-connected to the bottom of the anti-rotation screw (5), so that the guide plunger (6) cannot rotate during movement.

7. The plug-in type adjustable pilot ratio large flow hydraulically controlled one-way valve structure according to claim 1 is characterized in that: The push rod (17) is installed in the hole of the pilot valve block (1) through its outer cylindrical surface. The outer cylindrical surface of the push rod (17) is matched with the hole of the pilot valve block (1) and can move freely along its axial direction. The outer cylindrical surface of the push rod (17) is also provided with two symmetrical countersunk surfaces. The two countersunk surfaces of the outer cylindrical surface of the push rod (17) and the gap of the inner hole of the pilot valve block (1) form an oil path, which is used to realize the communication between the spring cavity of the second base (18) and the oil port of the oil drain port Y after the steel ball (24) is pushed open, and plays a hydraulic damping role in the communication process.

8. The plug-in type adjustable pilot ratio large flow hydraulically controlled one-way valve structure according to claim 1 is characterized in that: A first O-ring (9) is arranged inside the first mounting seat (10), a second O-ring (11) is arranged inside the guide seat (7), a second mounting seat (22) is fixedly connected to the bottom of the second base (18), a first retaining ring (19) is arranged outside the second base (18), a third O-ring (23) is arranged outside the second base (18), the third O-ring (23) is located below the first retaining ring (19), a hole retaining ring (21) is arranged at the bottom of the second mounting seat (22), and the hole retaining ring (21) is fixed inside the pilot valve block (1).

9. The plug-in type adjustable pilot ratio large flow hydraulically controlled one-way valve structure according to claim 1 is characterized in that: A second retaining ring (29) and a fourth O-ring (30) are provided at the external top end of the two-way valve sleeve (28), and a third retaining ring (31) and a fifth O-ring (32) are provided at the external bottom end of the two-way valve sleeve (28).

10. The plug-in type adjustable pilot ratio large flow hydraulically controlled one-way valve structure according to claim 1, characterized in that: A plurality of first cover plate mounting screws (33) are arranged around the two-way valve cover plate (34), a plurality of second valve block mounting screws (35) are arranged around the pilot valve block (1), and a plurality of third mounting seat screws (36) are arranged on one side of the first mounting seat (10).

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