A full steel ball type electromagnetic multi-way valve for a harvester and an operating method thereof

Abstract

The present application relates to the technical fields of harvester full steel ball type electromagnetic multi-way valve, and discloses a harvester full steel ball type electromagnetic multi-way valve and an operating method, which comprises a composite hydraulic control plunger, the composite hydraulic control plunger comprises a second steel needle, a sealing element and a second guide column, the sealing element comprises a third steel ball and a second ball seat, the second ball seat is connected in the second guide column, one end of the second ball seat is connected with the third steel ball, one end of the second steel needle is connected with the third steel ball, the third steel ball is used for blocking the opening A1, the other end of the second steel needle is connected with a combined hydraulic control plunger, the combined hydraulic control plunger is slidingly connected with a control chamber f, an oil inlet chamber h and an oil return chamber g are communicated, the opening A1, a chamber j, the oil inlet chamber h, the oil return chamber g and an oil return channel T1 are sequentially communicated. The harvester full steel ball type electromagnetic multi-way valve is composed of a double-ball type pilot valve and a steel ball type hydraulic control one-way valve. The anti-pollution ability is extremely strong, and the reliability is high.

Description

Technical Field

[0001] This invention relates to the technical field of all-steel ball electromagnetic multi-way valves for harvesters, specifically to an all-steel ball electromagnetic multi-way valve for harvesters and its operating method. Background Technology

[0002] Electromagnetic multi-way valves for harvesters have long been used abroad, but imported valves were difficult to accept due to their high price and stringent oil cleanliness requirements. In recent years, due to industry competition, electromagnetic valves have gradually gained popularity. Currently, the most commonly used domestically produced valves are... Figure 1 The image shows a direct-acting solenoid multi-way valve. Direct-acting means the electromagnet directly pushes the spool valve to change direction, resulting in a very small clearance between the spool valve and its orifice. Even tiny impurities in the oil can cause jamming, and since harvesters have difficulty troubleshooting such problems, direct-acting valves are not suitable for harvesters.

[0003] To address the aforementioned issues, this patent describes a highly contamination-resistant "all-steel-ball multi-way solenoid valve for harvesters." The term "all-steel-ball" means that all directional valves consist of a double-ball pilot valve and a steel-ball hydraulically controlled check valve. This design offers exceptional contamination resistance and extremely high reliability. Summary of the Invention

[0004] The purpose of this invention is to provide a harvester all-steel ball electromagnetic multi-way valve and its operation method to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a harvester all-steel ball type electromagnetic multi-way valve, including a valve body;

[0006] The valve body has an opening A at the top; the valve body is provided with a control chamber f, a chamber j, an oil inlet chamber h, an oil return chamber g, and an oil return passage T;

[0007] The valve body is equipped with a composite hydraulically controlled plunger, a two-way valve, and a hydraulically controlled one-way valve; the composite hydraulically controlled plunger, the hydraulically controlled one-way valve, and the two-way valve are connected in sequence;

[0008] The composite hydraulic plunger includes a combined hydraulic plunger, a second steel needle, a seal, and a second guide post; the seal includes a third steel ball and a second ball seat.

[0009] The second guide post is connected to the second ball seat; one end of the second ball seat is connected to the third steel ball; one end of the second steel needle is connected to the third steel ball; the third steel ball is used to seal opening A; the other end of the second steel needle is connected to the combined hydraulic plunger; the combined hydraulic plunger is slidably connected to the control chamber f; the oil inlet chamber h is connected to the oil return chamber g. Opening A, chamber j, oil inlet chamber h, oil return chamber g, and oil return passage T are sequentially connected.

[0010] Preferably, the valve body is further provided with an oil passage P; an unloading valve electromagnet, a first electromagnet and a second electromagnet are externally connected to the valve body; the oil passage P is connected to the unloading valve electromagnet; one end of the two-way valve is connected to the first electromagnet; the other end of the two-way valve is connected to the second electromagnet.

[0011] The bidirectional valve includes a first electromagnet push rod, a first pilot valve body, a first steel ball seat, a first steel ball, a first steel needle, a second steel ball, a first guide post, a second electromagnet push rod, a second pilot valve body, a third steel ball seat, a fifth steel ball, a fourth steel needle, and a sixth steel ball.

[0012] One end of the first electromagnet push rod is internally connected to the first electromagnet push rod; the other end of the first electromagnet push rod enters the first pilot valve body and is connected to one end of the first steel ball seat.

[0013] The first pilot valve body is provided with a first steel ball seat and a first steel ball; the first steel ball is connected to the other end of the first steel ball seat; the first steel ball is connected to one end of the first steel needle; the other end of the first steel needle is connected to the second steel ball; the second steel ball is connected to one end of the first guide post;

[0014] The valve body is provided with a return oil chamber d, a chamber c, a chamber b, a chamber a, a chamber b, a return oil chamber d, an oil passage e, and an oil passage e; the chamber a, the chamber b, the chamber c, the return oil chamber d, the oil passage e, and the control chamber f are connected in sequence; the return oil chamber d, the chamber c, the chamber b, and the chamber a are connected in sequence; the chamber c and the oil passage e are connected in sequence.

[0015] The second electromagnet is internally connected to one end of the second electromagnet push rod; the other end of the second electromagnet push rod enters the second pilot valve body and connects to one end of the third steel ball seat; the second pilot valve body is provided with the third steel ball seat and the fifth steel ball; the fifth steel ball is connected to one end of the fourth steel needle; the other end of the fourth steel needle is connected to the sixth steel ball; the sixth steel ball is connected to the other end of the first guide post;

[0016] Preferably, the valve body is provided with a control chamber f and an oil inlet passage P; the control chamber f is connected to the oil inlet passage e;

[0017] The control chamber f is equipped with a hydraulically controlled check valve; the hydraulically controlled check valve includes a first hydraulically controlled plunger, a third steel needle, and a fourth steel ball; one end of the first hydraulically controlled plunger is connected to one end of the third steel needle; the other end of the third steel needle is connected to the fourth steel ball; the fourth steel ball is used to block the inlet oil passage P.

[0018] Preferably, the first guide post is provided with a first spring; the second ball seat is connected to the second guide post through a second spring.

[0019] Compared with existing technologies, the advantages of this invention are: the harvester's all-steel ball electromagnetic multi-way valve and its operating method consist of all directional valves composed of double-ball pilot valves and steel ball hydraulic control check valves. It has extremely strong anti-pollution capabilities and high reliability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the existing technology structure;

[0021] Figure 2 This is a schematic diagram of the main structure of the valve body in this invention;

[0022] Figure 3 This is a top view of the valve body in this invention.

[0023] Figure 4 for Figure 2 Cross-sectional view of AE;

[0024] Figure 5 for Figure 2 Cross-sectional view of ABCDE;

[0025] Figure 6 for Figure 2 Cross-sectional view at the FF section;

[0026] Figure 7 This is a table showing the corresponding oil port operation when the electromagnet is energized.

[0027] In the diagram: 1. Electromagnetic push rod; 2. First pilot valve body; 3. First steel ball seat; 4. First steel ball; 5. First steel needle; 6. Second steel ball; 7. First guide post; 8. First spring; 9. Combined hydraulic plunger; 10. Second steel needle; 11. Seal; 12. Third steel ball; 13. Second guide post; 14. Second ball seat; 15. Second spring; 16. First hydraulic plunger; 17. Third steel needle; 18. Fourth steel ball; 19. Second electromagnet push rod; 20. Second pilot valve body; 21. Third steel ball seat; 22. Fifth steel ball; 23. Fourth steel needle; 24. Sixth steel ball; 25. Unloading valve electromagnet; 26. First electromagnet; 27. Second electromagnet; 28. Third electromagnet; 29. ​​Fourth electromagnet; 30. Fifth electromagnet; 31. Sixth electromagnet; 32. Double-acting hydraulic plunger. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Please see Figures 1-7 The present invention provides a technical solution: a harvester all-steel ball electromagnetic multi-way valve and an operating method thereof, including a valve body;

[0030] The valve body has an opening A1 at the top; the valve body is provided with a control chamber f, a chamber j, an oil inlet chamber h, an oil return chamber g, and an oil return passage T1;

[0031] The valve body is equipped with a composite hydraulically controlled plunger, a two-way valve, and a hydraulically controlled one-way valve; the composite hydraulically controlled plunger, the hydraulically controlled one-way valve, and the two-way valve are connected in sequence;

[0032] The composite hydraulic plunger includes a combined hydraulic plunger 9, a second steel needle 10, a seal 11, and a second guide post 13; the seal 11 includes a third steel ball 12 and a second ball seat 14.

[0033] The second guide post 13 is connected to the second ball seat 14; one end of the second ball seat 14 is connected to the third steel ball 12; one end of the second steel needle 10 is connected to the third steel ball 12; the third steel ball 12 is used to seal the opening A1; the other end of the second steel needle 10 is connected to the combined hydraulic plunger 9; the combined hydraulic plunger 9 is slidably connected to the control chamber f; the oil inlet chamber h is connected to the oil return chamber g. The opening A1, chamber j, oil inlet chamber h, oil return chamber g, and oil return passage T1 are connected in sequence.

[0034] Furthermore, the valve body is also provided with an oil passage P; the valve body is externally connected to an unloading valve electromagnet 25, a first electromagnet 26, and a second electromagnet 27; the oil passage P is connected to the unloading valve electromagnet 25; one end of the two-way valve is connected to the first electromagnet 26; the other end of the two-way valve is connected to the second electromagnet 27.

[0035] The bidirectional valve includes a first electromagnet push rod 1, a first pilot valve body 2, a first steel ball seat 3, a first steel ball 4, a first steel needle 5, a second steel ball 6, a first guide post 7, a second electromagnet push rod 19, a second pilot valve body 20, a third steel ball seat 21, a fifth steel ball 22, a fourth steel needle 23, and a sixth steel ball 24.

[0036] One end of the first electromagnet 26 is connected to the first electromagnet push rod 1; the other end of the first electromagnet push rod 1 enters the first pilot valve body 2 and is connected to one end of the first steel ball seat 3.

[0037] The first pilot valve body 2 is provided with the first steel ball seat 3 and the first steel ball 4; the first steel ball 4 is connected to the other end of the first steel ball seat 3; the first steel ball 4 is connected to one end of the first steel needle 5; the other end of the first steel needle 5 is connected to the second steel ball 6; the second steel ball 6 is connected to one end of the first guide post 7;

[0038] The valve body is provided with a return oil chamber d1, a chamber c1, a chamber b1, a chamber a, a chamber b, a return oil chamber d, an oil passage e, and an oil passage e1; the chamber a, the chamber b, the chamber c, the return oil chamber d, the oil passage e, and the control chamber f are connected in sequence; the return oil chamber d1, the chamber c1, the chamber b1, and the chamber a are connected in sequence; the chamber c1 and the oil passage e1 are connected in sequence.

[0039] The second electromagnet 27 is internally connected to one end of the second electromagnet push rod 19; the other end of the second electromagnet push rod 19 enters the second pilot valve body 20 and is connected to one end of the third steel ball seat 21; the second pilot valve body 20 is internally provided with the third steel ball seat 21 and the fifth steel ball 22; the fifth steel ball 22 is connected to one end of the fourth steel needle 23; the other end of the fourth steel needle 23 is connected to the sixth steel ball 24; the sixth steel ball 24 is connected to the other end of the first guide post 7;

[0040] Furthermore, the valve body is provided with a control chamber f1 and an oil inlet passage P1; the control chamber f1 is connected to the oil inlet passage e1;

[0041] The control chamber f1 is equipped with a hydraulically controlled check valve; the hydraulically controlled check valve includes a first hydraulically controlled plunger 16, a third steel needle 17 and a fourth steel ball 18; one end of the first hydraulically controlled plunger 16 is connected to one end of the third steel needle 17; the other end of the third steel needle 17 is connected to the fourth steel ball 18; the fourth steel ball 18 is used to block the inlet oil passage P1.

[0042] Furthermore, the first guide post 7 is provided with a first spring 8; the second ball seat 14 is connected to the second guide post 13 through a second spring 15.

[0043] The top surface of the valve body is provided with: opening A1, opening A2, opening A3, opening B3, oil inlet P and oil return T.

[0044] The valve body is provided with chamber a, chamber b, chamber b1, chamber c, chamber c1, return oil chamber d, return oil chamber d1, oil passage e, oil passage e1, control chamber f, control chamber f1, chamber j, inlet oil chamber h, return oil chamber g, return oil passage T1 and inlet oil passage P1;

[0045] This invention features a monolithic structure, and this embodiment uses a representative 4-way, 7-electrode configuration. Other routes follow existing structures and will not be described in detail here. Each electromagnet corresponds to a double-ball pilot valve. When the unloading valve electromagnet 25 stops, pressure is present at the unloading port P. When the other 6 electromagnets are energized, the unloading valve electromagnet 25 must also be energized. The port marked with an opening A1 is the cutting table oil port, which is a large-diameter port.

[0046] like Figure 4 The diagram shows the cross-sectional structure of a large-diameter 3-position 3-way valve, also known as a cutting platform valve, and the oil flow sequence during cylinder descent. The focus is on the "composite hydraulic plunger."

[0047] The composite hydraulic plunger includes a second steel needle 10, a seal 11, and a second guide post 13; the seal 11 includes a third steel ball 12 and a second ball seat 14.

[0048] When the first electromagnet 26 is energized, the first electromagnet push rod 1, through the first steel ball seat 3, causes the first steel ball 4 to block the return oil valve port in the pilot valve body 2, cutting off the control oil chamber C and the return oil chamber d. Simultaneously, the first steel ball 4 pushes the first steel needle 5 to open the second steel ball 6. At the same time, the unloading valve electromagnet 25 is also energized, stopping unloading and pressurizing the pressure oil passage P. The pressurized oil flows into chambers a and b, and then into chamber c. It then passes through chamber c and oil passage e to the left end of the composite hydraulic control plunger, which is the control chamber f. This pushes the composite hydraulic control plunger to the right to its endpoint. The second steel needle 10 on the composite hydraulic control plunger pushes open the third steel ball 12, causing the second ball seat 14 to unlock. It should be noted that at the same time the composite hydraulic control plunger unlocks, two annular grooves on the cylindrical surface of the composite hydraulic control plunger connect the inlet chamber h and the return chamber g inside the valve hole. Therefore, the movement of the third steel ball 12 at the opening A1 causes the return oil passage T1 of the opening, chamber j, inlet chamber h, and finally chamber g to be affected. The composite hydraulic plunger is a design that integrates the unlocking function and the flow distribution function.

[0049] Figure 5 The upper and lower groups in the middle have already been Figure 4 I have seen it at the exhibition. Figure 5 This embodies the hydraulically controlled check valve.

[0050] When the second electromagnet 27 is energized, the second electromagnet push rod 19, through the third steel ball seat 21, causes the fourth steel ball 22 to block the return port in the pilot valve body 20, cutting off the control chamber c1 from the return chamber d1. Simultaneously, the fifth steel ball 22 pushes the fourth steel needle 23 to open the sixth steel ball 24. At the same time, the unloading valve electromagnet 25 is also energized, stopping the unloading valve and pressurizing the pressure oil passage P. The pressurized oil flows into chamber a, chamber b1, enters chamber c1, and then flows through control chamber c1 to control oil passage e1, delivering the pressurized oil to the right control chamber f1 of the first hydraulic plunger 16, pushing the first hydraulic plunger 16 to the left. The third steel needle 17 on the plunger pushes open the fourth steel ball 18, allowing the pressurized oil to enter from the inlet passage P1 into the steel ball chamber, and then through the steel ball opening into the inlet chamber h. Note that the pressure in the inlet chamber h pushes the composite hydraulic plunger to the left to its endpoint. At this time, the sealing band of the composite hydraulic plunger coincides with the sealing band between the valve body g chamber and the oil inlet chamber h, separating the g chamber and the oil inlet chamber h. The pressure oil can only rush to the right through the third steel ball 12 and be output from the opening A1.

[0051] The present invention Figure 5In this invention, the hydraulic check valve employs an unconventional design. A conventional design would involve mounting the third steel ball 12 in the direction that prevents the oil in the cylinder from dropping, commonly known as a hydraulic lock. After unlocking, the oil in the cylinder drops. However, in this invention, the hydraulic check valve composed of the fourth steel ball 18 and the first hydraulic plunger 16 is used in reverse. When the second electromagnet 27 is energized, the hydraulic check valve unlocks, introducing pressurized oil into the inlet chamber h, causing the oil in the cylinder to rise. This design eliminates the need for a directional valve.

[0052] Will Figure 4 as well as Figure 5 Let's examine the composite hydraulic control plunger together. The two diagrams illustrate its two working positions. First, looking at the AE section, when the first electromagnet 26 is energized, oil passage e inputs pressurized oil into control chamber f. This pushes the composite hydraulic control plunger to the right-hand unlocked position, opening the third steel ball 12, at which point the cylinder begins to return oil. Simultaneously, the switching function of the composite hydraulic control plunger activates, connecting the return oil chamber g and the pressurized oil inlet chamber h. The cylinder's return oil flows through opening A1, the opening at the third steel ball 12, from chamber j to inlet chamber h, and then through the return oil passage T1, which connects to chamber g, back to the oil tank.

[0053] Let's look again. Figure 5 When the second electromagnet 27 is energized, pressurized oil enters the inlet chamber h through the opening of the fourth steel ball 18. This pressurized oil pushes the composite hydraulic control plunger to the left, closing the third steel ball 12. Simultaneously, the switching function of the composite hydraulic control plunger activates, cutting off the return chamber g and the inlet chamber h. Pressurized oil can only pass through the inlet chamber h to open the third steel ball 12 and exit through port A1. This not only eliminates the need for a spool valve-type directional control valve but also eliminates the need for any directional control spool valves in the entire multi-way directional control valve system.

[0054] To ensure the reliable operation of the check valve, each steel ball must be press-fitted with a guide post, such as... Figure 4 As shown in the diagram, the third steel ball 12, the second guide post 13, and the second ball seat 14 represent similar structures to the first steel ball 4 and the first steel ball seat 3, as well as the second steel ball 6 and the first guide post 7. All require the steel ball and the guide post to be perfectly concentric. This concentricity is ensured through a manufacturing process where an inner ejector pin is used to press the steel ball against the guide post's outer circumference while grinding.

[0055] Figure 3 As can be seen from the text, the valve body is also equipped with three electromagnets 28, a fourth electromagnet 29, a fifth electromagnet 30, and a sixth electromagnet 31. The internal passages of these electromagnets are all existing technologies and will not be described in detail here.

[0056] Working principle:

[0057] The upward path of the oil in the cylinder is: oil inlet P - oil inlet P1 - fourth steel ball 18 - oil inlet chamber h - chamber j - third steel ball 12 - opening A1.

[0058] The oil descending path in the cylinder is: opening A1 - third steel ball 12 - chamber j - oil inlet chamber h - oil return chamber g - oil return passage T1 - oil return passage T.

[0059] In this invention, the combined hydraulic plunger 9 in the composite hydraulic plunger has two annular grooves on its outer surface. These two grooves correspond to the inlet chamber h and the return chamber g, respectively, forming a distribution chamber. The composite hydraulic plunger... Figure 4 , Figure 5 At the right end of the device is a chamber j, which has several small holes communicating with the annular groove on the combined hydraulic plunger 9, the oil inlet chamber h, and the oil return chamber g. A second steel needle 10 extends from the center of the holes in chamber j, pushing open the third steel ball 12 to achieve the unlocking function. After unlocking, the internal oil flows through the oil chamber j and the several small holes into the oil inlet chamber h.

[0060] When the first electromagnet 26 is energized, the pressure oil in the control chamber f pushes the combined hydraulic plunger 9 in the composite hydraulic plunger to stop at the right end. The second steel needle 10 pushes open the third steel ball 12. At the same time, the oil inlet chamber h and the oil return chamber g are connected. At this time, the oil return from the opening A1 flows through the opening at the third steel ball 12, the chamber j, the oil inlet chamber h, and the oil return chamber g, and finally flows into the oil return channel T1 connected to the oil return chamber g, realizing oil return and the oil in the cylinder drops.

[0061] When the second electromagnet 27 is energized, the fourth steel ball 18 opens, and the pressurized oil enters the oil inlet chamber h, pushing the combined hydraulic plunger 9 in the composite hydraulic plunger to the left. At this time, the return oil chamber g and the oil inlet chamber h are separated, and the pressurized oil can only pass through the oil inlet chamber h and the chamber j. The pressurized oil pushes open the third steel ball 12 and is output from the opening A1, causing the oil in the cylinder to rise.

[0062] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0063] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A harvester's all-steel ball type electromagnetic multi-way valve, characterized in that, Including the valve body; The valve body has an opening A1 at the top; the valve body is provided with a control chamber f, a chamber j, an oil inlet chamber h, an oil return chamber g, and an oil return passage T1; The valve body is equipped with a composite hydraulically controlled plunger, a two-way valve, and a hydraulically controlled one-way valve; the composite hydraulically controlled plunger, the hydraulically controlled one-way valve, and the two-way valve are connected in sequence; The composite hydraulic plunger includes a combined hydraulic plunger (9), a second steel needle (10), a seal (11), and a second guide post (13); the seal (11) includes a third steel ball (12) and a second ball seat (14). The combined hydraulic plunger (9) has two annular grooves on its outer surface; the two annular grooves of the combined hydraulic plunger (9) are respectively engaged with the oil inlet chamber h and the oil return chamber g; The second guide post (13) is connected to the second ball seat (14); one end of the second ball seat (14) is connected to the third steel ball (12); one end of the second steel needle (10) is connected to the third steel ball (12); the third steel ball (12) is provided between the opening A1 and the chamber j; the third steel ball (12) is used to block the opening A1; the other end of the second steel needle (10) is connected to the combined hydraulic plunger (9); the combined hydraulic plunger (9) is slidably connected in the control chamber f; the oil inlet chamber h is connected to the oil return chamber g; the chamber j is connected to the oil inlet chamber h; the oil return chamber g is connected to the oil return passage T1; The valve body is also provided with an oil passage P; the valve body is externally connected to an unloading valve electromagnet (25), a first electromagnet (26) and a second electromagnet (27); the oil passage P is connected to the unloading valve electromagnet (25); one end of the two-way valve is connected to the first electromagnet (26); the other end of the two-way valve is connected to the second electromagnet (27). The bidirectional valve includes a first electromagnet push rod (1), a first pilot valve body (2), a first steel ball seat (3), a first steel ball (4), a first steel needle (5), a second steel ball (6), a first guide post (7), a second electromagnet push rod (19), a second pilot valve body (20), a third steel ball seat (21), a fifth steel ball (22), a fourth steel needle (23), and a sixth steel ball (24). The first electromagnet (26) is internally connected to one end of the first electromagnet push rod (1); the other end of the first electromagnet push rod (1) enters the first pilot valve body (2) and is connected to one end of the first steel ball seat (3); The first pilot valve body (2) is provided with the first steel ball seat (3) and the first steel ball (4); the first steel ball (4) is connected to the other end of the first steel ball seat (3); the first steel ball (4) is connected to one end of the first steel needle (5); the other end of the first steel needle (5) is connected to the second steel ball (6); the second steel ball (6) is connected to one end of the first guide post (7); The valve body is provided with a return oil chamber d1, a chamber c1, a chamber b1, a chamber a, a chamber b, a chamber c, a return oil chamber d, an oil passage e, and an oil passage e1; the chamber a, the chamber b, the chamber c, the return oil chamber d, the oil passage e, and the control chamber f are connected in sequence; the return oil chamber d1, the chamber c1, the chamber b1, and the chamber a are connected in sequence; the chamber c1 and the oil passage e1 are connected in sequence. The second electromagnet (27) is connected to one end of the second electromagnet push rod (19); the other end of the second electromagnet push rod (19) enters the second pilot valve body (20) and is connected to one end of the third steel ball seat (21); the second pilot valve body (20) is provided with the third steel ball seat (21) and the fifth steel ball (22); the fifth steel ball (22) is connected to one end of the fourth steel needle (23); the other end of the fourth steel needle (23) is connected to the sixth steel ball (24); the sixth steel ball (24) is connected to the other end of the first guide post (7).

2. The all-steel ball electromagnetic multi-way valve for harvesters according to claim 1, characterized in that, The valve body is provided with a control chamber f1 and an oil inlet passage P1; the control chamber f1 is connected to the oil inlet passage P1; The control chamber f1 is equipped with a hydraulic control check valve; the hydraulic control check valve includes a first hydraulic control plunger (16), a third steel needle (17) and a fourth steel ball (18); one end of the first hydraulic control plunger (16) is connected to one end of the third steel needle (17); the other end of the third steel needle (17) is connected to the fourth steel ball (18); the fourth steel ball (18) is used to block the oil inlet passage P1.

3. The all-steel ball electromagnetic multi-way valve for harvesters according to claim 1, characterized in that, The first guide post (7) is provided with a first spring (8); the second ball seat (14) is connected to the second guide post (13) through a second spring (15).

4. An operating method for a harvester's all-steel ball electromagnetic multi-way valve based on claim 1, characterized in that, When the first electromagnet (26) is energized, the pressure oil in the control chamber f pushes the combined hydraulic plunger (9) to stop at the right end. The second steel needle (10) pushes open the third steel ball (12). At the same time, the oil inlet chamber h and the oil return chamber g are connected. At this time, the oil return from the opening A1 flows through the opening at the third steel ball (12), the chamber j, the oil inlet chamber h, and the oil return chamber g, and finally flows into the oil return channel T1 connected to the oil return chamber g, realizing oil return and the oil in the cylinder drops. When the second electromagnet (27) is energized, the pressure oil enters the oil inlet chamber h due to the opening of the fourth steel ball (18), pushing the combined hydraulic plunger (9) to the left. At this time, the return oil chamber g and the oil inlet chamber h are separated, and the pressure oil can only pass through the oil inlet chamber h and the chamber j. The pressure oil pushes open the third steel ball (12) and is output from the opening A1, causing the oil in the cylinder to rise.

Images