All-steel-ball type electromagnetic multi-way valve of harvester

Abstract

The utility model relates to the technical field of all-steel-ball type electromagnetic multi-way valves of harvesters, and discloses an all-steel-ball type electromagnetic multi-way valve of a harvester, 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, and the second steel needle is connected with the second steel needle. A second ball seat is connected into the second guide column, one end of the second ball seat is connected with a third steel ball, one end of a 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 slidably connected into the control chamber f, and the oil inlet chamber h is communicated with the oil return chamber g. The opening A1, the cavity j, the oil inlet chamber h, the oil return chamber g and the oil return channel T1 are sequentially communicated. According to the all-steel ball type electromagnetic multi-way valve of the harvester, all reversing valves are composed of double-ball type pilot valves and steel ball type hydraulic control one-way valves. The anti-pollution capacity is extremely high, and the reliability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of a full-steel-ball electromagnetic multi-way valve for a harvester, in particular to a full-steel-ball electromagnetic multi-way valve for a harvester. Background Art

[0002] The electromagnetic multi-way valve for harvesters has been used in foreign countries for a long time. However, due to the high price of imported valves and the high requirements for oil cleanliness, it is difficult to accept them. In recent years, due to industry competition, electromagnetic valves have gradually been used. The domestic valves currently in common use are as follows: Figure 1 The direct-acting solenoid multi-way valve shown in the figure. Direct-acting valves are designed to shift the direction of the spool valve directly through the solenoid, creating a very small clearance between the spool valve and the spool hole. Even small debris in the oil can cause oil jamming, and harvesters are difficult to troubleshoot, so direct-acting valves are not suitable for harvesters.

[0003] To address these issues, this patented "harvester all-steel-ball multi-way solenoid valve" has been developed, offering exceptional pollution resistance. The all-steel-ball design means all directional control valves are composed of a double-ball pilot valve and a steel-ball hydraulically controlled check valve. This design offers exceptional pollution resistance and reliability. Utility Model Content

[0004] The purpose of the utility model is to provide a full steel ball electromagnetic multi-way valve for a harvester to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present utility model provides the following technical solutions: a harvester full steel ball electromagnetic multi-way valve, comprising a valve body;

[0006] The valve body is provided with 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] A composite hydraulically controlled plunger, a two-way valve, and a hydraulically controlled one-way valve are provided in the valve body; the composite hydraulically controlled plunger, the hydraulically controlled one-way valve, and the two-way valve are connected in sequence;

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

[0009] The second guide column is internally 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 block opening A; the other end of the second steel needle is connected to the combined hydraulic control plunger; the combined hydraulic control 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, an oil passage P is further provided inside the valve body; an unloading valve electromagnet, a first electromagnet and a second electromagnet are 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 two-way valve includes a first electromagnetic 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 column, a second electromagnetic 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 connected to the first electromagnet; 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 steel ball seat and the first steel ball are disposed within the first pilot valve body; 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; and the second steel ball is connected to one end of the first guide post.

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

[0015] One end of the second electromagnet push rod is connected to the second electromagnet; the other end of the second electromagnet push rod enters the second pilot valve body and is connected to one end of the third steel ball seat; the third steel ball seat and the fifth steel ball are provided in the second pilot valve body; 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 column.

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

[0017] A hydraulically controlled one-way valve is provided in the control chamber f; the hydraulically controlled one-way 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 oil inlet channel P.

[0018] Preferably, a first spring is provided in the first guide column; and the second ball seat is connected to the second guide column via a second spring.

[0019] Compared with the existing technology, the beneficial effect of the utility model is that the harvester full steel ball electromagnetic multi-way valve has all the reversing valves composed of double ball pilot valves and steel ball hydraulic control check valves, which has strong anti-pollution ability and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the prior art structure;

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

[0022] Figure 3 This is a schematic diagram of the top view of the valve body in the utility model;

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

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

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

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

[0027] In the figure: solenoid push rod 1, first pilot valve body 2, first steel ball seat 3, first steel ball 4, first steel needle 5, second steel ball 6, first guide column 7, first spring 8, combined hydraulic control plunger 9, second steel needle 10, seal 11, third steel ball 12, second guide column 13, second ball seat 14, second spring 15, first hydraulic control plunger 16, third steel needle 17, fourth steel ball 18, second electromagnet push rod 19, second pilot valve body 20, third steel ball seat 21, fifth steel ball 22, fourth steel needle 23, sixth steel ball 24, unloading valve electromagnet 25, first electromagnet 26, second electromagnet 27, third electromagnet 28, fourth electromagnet 29, fifth electromagnet 30, sixth electromagnet 31, double-acting hydraulic control plunger 32. DETAILED DESCRIPTION

[0028] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0029] See also Figures 1 to 7 ,The utility model provides a technical solution: a harvester full steel ball electromagnetic multi-way valve, comprising a valve body;

[0030] The top of the valve body is provided with an opening A1; 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] A composite hydraulically controlled plunger, a two-way valve, and a hydraulically controlled one-way valve are provided in the valve body; the composite hydraulically controlled plunger, the hydraulically controlled one-way valve, and the two-way valve are connected in sequence;

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

[0033] The second guide post 13 is internally 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 block the opening A1; the other end of the second steel needle 10 is connected to the combined hydraulic control plunger 9; the combined hydraulic control plunger 9 is slidably connected to the control chamber f; the oil inlet chamber h is connected to the oil return chamber g. Opening A1, chamber j, oil inlet chamber h, oil return chamber g, and oil return passage T1 are sequentially connected.

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

[0035] The two-way valve includes a first electromagnetic 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 column 7, a second electromagnetic 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] The first electromagnet 26 is 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;

[0037] The first steel ball seat 3 and the first steel ball 4 are provided in the first pilot valve body 2; 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 column 7;

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

[0039] One end of the second electromagnet push rod 19 is connected to the second electromagnet 27; 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 third steel ball seat 21 and the fifth steel ball 22 are provided in the second pilot valve body 20; 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 column 7.

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

[0041] A hydraulically controlled one-way valve is provided in the control chamber f1; the hydraulically controlled one-way 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 oil inlet passage P1.

[0042] Furthermore, a first spring 8 is provided in the first guide column 7 ; and the second ball seat 14 is connected to the second guide column 13 via a second spring 15 .

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

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

[0045] This utility model is a monolithic structure. This embodiment utilizes a representative four-way system with seven electromagnets. The remaining circuits are conventional structures and are not described here. Each electromagnet corresponds to a double-ball pilot valve. When the unloading valve electromagnet 25 is deactivated and pressure is present at the unloading port P, the remaining six electromagnets are energized, and the unloading valve electromagnet 25 is also energized. The opening marked A1 is the header oil port and has a large diameter.

[0046] like Figure 4 The figure shows the cross-section of a large-diameter, 3-position, 3-way valve, also known as a header valve, and the oil flow sequence during cylinder lowering. The focus is on the "compound hydraulic control plunger."

[0047] The composite hydraulic control plunger includes a second steel needle 10 , a sealing member 11 and a second guide post 13 ; the sealing member 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 causes the first steel ball 4 to block the return oil valve port in the pilot valve body 2 through the first steel ball seat 3, thereby cutting off the control oil chamber C and the return oil chamber d. At the same time, 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 so that pressure oil channel P has pressure. The pressure oil flows into chamber a and chamber b, and enters chamber c. It then enters the left end of the compound hydraulic control plunger, that is, the control chamber f, through chamber c and oil channel e. It pushes the compound hydraulic control plunger to the right to the end point. The second steel needle 10 on the compound hydraulic control plunger pushes open the third steel ball 12 and drives the second ball seat 14 to unlock. It should be noted here that when the compound hydraulic control plunger is unlocked, the two annular grooves opened on the cylindrical surface of the compound hydraulic control plunger connect the oil inlet chamber h and the oil return chamber g in the valve hole. Therefore, the third steel ball 12 moves to return oil from opening A1, causing the opening and chamber j, oil inlet chamber h to the oil return channel T1 of chamber g. The composite hydraulic control plunger is a design that combines the unlocking function with the flow distribution function.

[0049] Figure 5 The upper and lower groups in Figure 4 Viewed in the exhibition. Figure 5 The hydraulically controlled one-way valve is embodied in it.

[0050] When the second solenoid 27 is energized, it pushes the rod 19 through the third ball seat 21, causing the fourth ball 22 to block the oil return port in the pilot valve body 20, isolating the control chamber c1 from the oil return chamber d1. Simultaneously, the fifth ball 22 pushes the fourth needle 23, opening the sixth ball 24. Simultaneously, the unloading valve solenoid 25 is energized, stopping the unloading valve and allowing pressure to build up in the pressure oil passage P. Pressurized oil flows into chambers a, b1, and c1. It then flows through control chamber c1 to control oil passage e1, delivering it to the control chamber f1 at the right end of the first hydraulic control plunger 16, pushing it leftward. The third needle 17 on the plunger pushes the fourth ball 18 away, allowing pressurized oil to flow from the oil inlet passage P into oil passage P1 and then into the ball chamber, passing through the ball opening and into the oil inlet chamber h. Note that the pressure in the oil inlet chamber h pushes the compound hydraulic control plunger leftward to its final stop. At this time, the sealing band of the composite hydraulic control plunger overlaps with the sealing band between the valve body chamber g and the oil inlet chamber h, isolating the chamber g from the oil inlet chamber h. The pressure oil can only push the third steel ball 12 to the right and be discharged from the opening A1.

[0051] The utility model Figure 5 In the present invention, the hydraulically controlled check valve employs an unconventional design. Conventional designs typically involve installing the third steel ball 12 in a direction that prevents the oil in the cylinder from descending, commonly known as a hydraulic lock. Upon unlocking, the oil in the cylinder descends. However, in the present invention, the hydraulically controlled check valve, comprised of the fourth steel ball 18 and the first hydraulically controlled plunger 16, operates in reverse. When the second electromagnet 27 is energized, the hydraulically controlled check valve unlocks, directing pressurized oil into the oil inlet chamber h, causing the oil in the cylinder to ascend. This design eliminates the need for a reversing valve.

[0052] Will Figure 4 as well as Figure 5 Let's look at the compound hydraulic control plunger together. The two figures show the two working positions of the compound hydraulic control plunger. First look at the AE section. When the first electromagnet 26 is energized, the oil channel e inputs the pressure oil into the control chamber f. Push the compound hydraulic control plunger to the unlocking position at the right end, push the third steel ball 12 away, and the cylinder begins to return oil. At the same time, the switching function of the compound hydraulic control plunger takes effect. Connect the return oil chamber g and the pressure oil inlet chamber h. The return oil of the cylinder passes through the opening A1, the opening at the third steel ball 12, from chamber j to the oil inlet chamber h, and then flows back to the oil tank through the return oil channel T1 connected to chamber g.

[0053] Look again Figure 5 When the second solenoid 27 is energized, pressurized oil enters the oil inlet chamber h through the opening of the fourth steel ball 18. This oil pushes the composite hydraulic control plunger to the left, closing the third steel ball 12. Simultaneously, the composite hydraulic control plunger's switching function activates, isolating the oil return chamber g from the oil inlet chamber h. Pressurized oil can only flow through the oil inlet chamber h, disengaging the third steel ball 12 and exiting through port A1. This not only eliminates the need for a spool-type directional control valve, but also eliminates the need for a spool valve in the multi-way directional control valve.

[0054] In order to ensure the reliable operation of the one-way valve, each steel ball must be pressed with a guide column, such as Figure 4 The third steel ball 12, second guide post 13, and second ball seat 14, shown in FIG. (above), are similar in structure to the first steel ball 4 and first steel ball seat 3, and the second steel ball 6 and first guide post 7. In both cases, the steel balls and guide posts must be perfectly concentric. This is achieved through a process that requires an internal ejector pin to press the press-fit steel ball against the outer diameter of the guide post to maintain concentricity.

[0055] Figure 3 As can be seen, the valve body is further provided with a third electromagnet 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 rising path of oil in the oil cylinder is: oil inlet channel P-oil inlet channel P1-fourth steel ball 18-oil inlet chamber h-chamber j-third steel ball 12-opening A1.

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

[0059] In the present invention, the outer surface of the combined hydraulic control plunger 9 in the composite hydraulic control plunger is provided with two annular grooves, which correspond to the oil inlet chamber h and the oil return chamber g respectively and form a flow distribution chamber. Figure 4 、 Figure 5 The right end of the chamber j has several small holes in it that communicate with the annular groove on the combined hydraulic control plunger 9, the oil inlet chamber h, and the oil return chamber g. The second steel needle 10 extends from the center of the hole in the chamber j to push the third steel ball 12 to unlock the lock. 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 pressurized oil in the control chamber f pushes the combined hydraulic control plunger 9 in the compound hydraulic control plunger to stop at the right end, and 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 return oil of the opening A1 flows through the opening at the third steel ball 12, the chamber j, the oil inlet chamber h, the oil return chamber g, and finally flows into the return oil 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 pressure oil enters the oil inlet chamber h, pushing the combined hydraulic control plunger 9 in the composite hydraulic control plunger to the left end. At this time, the oil return chamber g and the oil inlet chamber h are separated, and the pressure oil can only pass through the oil inlet chamber h and 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.

[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 present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0063] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A full steel ball electromagnetic multi-way valve for a harvester, characterized in that: Including valve body; The top of the valve body is provided with an opening A1; 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; A composite hydraulically controlled plunger, a two-way valve, and a hydraulically controlled one-way valve are provided in the valve body; the composite hydraulically controlled plunger, the hydraulically controlled one-way valve, and the two-way valve are connected in sequence; The composite hydraulic control plunger comprises a combined hydraulic control plunger (9), a second steel needle (10), a sealing member (11) and a second guide column (13); the sealing member (11) comprises a third steel ball (12) and a second ball seat (14); The outer surface of the combined hydraulic control plunger (9) is provided with two annular grooves; the two annular grooves of the combined hydraulic control plunger (9) respectively cooperate with the oil inlet chamber h and the oil return chamber g; The second guide column (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 control plunger (9); the combined hydraulic control plunger (9) is slidably connected to 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 channel T1.

2. A harvester full steel ball electromagnetic multi-way valve according to claim 1, characterized in that: An oil passage P is further provided inside the valve body; an unloading valve electromagnet (25), a first electromagnet (26) and a second electromagnet (27) are connected to the valve body; the oil passage P is in communication with 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 two-way valve comprises a first electromagnetic 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 column (7), a second electromagnetic 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); One end of the first electromagnet push rod (1) is connected to the inside of the first electromagnet (26); the other end of the first electromagnet push rod (1) enters the first pilot valve body (2) and connects to one end of the first steel ball seat (3); The first steel ball seat (3) and the first steel ball (4) are provided in the first pilot valve body (2); 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 column (7); The valve body is provided with an oil return chamber d1, chamber c1, chamber b1, chamber a, chamber b, chamber c, an oil return chamber d, an oil passage e, and an oil passage e1; the chamber a, the chamber b, the chamber c, the oil return chamber d, the oil passage e, and the control chamber f are sequentially connected; the oil return chamber d1, the chamber c1, the chamber b1, and the chamber a are sequentially connected; the chamber c1 and the oil passage e1 are sequentially connected; One end of the second electromagnet push rod (19) is connected to the inside of the second electromagnet (27); 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 a 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 column (7).

3. A harvester full steel ball electromagnetic multi-way valve according to claim 2, characterized in that: A control chamber f1 and an oil inlet passage P1 are provided in the valve body; the control chamber f1 is connected to the oil passage e1; A hydraulically controlled one-way valve is provided in the control chamber f1; the hydraulically controlled one-way 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 oil inlet passage P1.

4. A harvester full steel ball electromagnetic multi-way valve according to claim 2, characterized in that: A first spring (8) is provided in the first guide column (7); and the second ball seat (14) is connected to the second guide column (13) via a second spring (15).

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