All-steel ball type electromagnetic multi-way valve of harvester and operation method of all-steel ball type electromagnetic multi-way valve

Abstract

The invention relates to the technical field of harvester all-steel-ball type electromagnetic multi-way valves, and discloses a harvester all-steel-ball type electromagnetic multi-way valve and an operation method.The harvester all-steel-ball type electromagnetic multi-way valve comprises a composite hydraulic control plunger, the composite hydraulic control plunger comprises a second steel needle, a sealing piece and a second guide column, and the sealing piece comprises a third steel ball and a second ball seat; 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 invention relates to the technical field of a harvester full-steel ball electromagnetic multi-way valve, and in particular to a harvester full-steel ball electromagnetic multi-way valve and an operating method thereof. Background Art

[0002] The electromagnetic multi-way valve for harvesters has long been used abroad, but it is difficult to accept imported valves because of their high prices and high requirements for oil cleanliness. In recent years, due to industry competition, electromagnetic valves have gradually been used. The domestic valves commonly used now are as follows Figure 1 The direct-acting electromagnetic multi-way valve shown in the figure. The so-called direct-acting type means that the electromagnet directly pushes the slide valve to change direction, and the clearance between the slide valve and the slide valve hole is very small. Tiny debris in the oil will cause jamming, and it is difficult for the harvester to handle the fault, so the direct-acting valve is not suitable for the harvester.

[0003] In response to the above problems, this patent has developed a "harvester full steel ball multi-way solenoid valve" with strong anti-pollution ability. The so-called full steel ball type means that all reversing valves are composed of double ball pilot valves and steel ball hydraulic control check valves. It has strong anti-pollution ability and high reliability. Summary of the invention

[0004] The object of the present invention is to provide a harvester full steel ball electromagnetic multi-way valve and an operating method to solve the problems raised in the above background technology.

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

[0006] The top of the valve body is provided with an opening A; 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 disposed 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 comprises a combined hydraulic control plunger, a second steel needle, a sealing member and a second guide column; the sealing member comprises a third steel ball and a second ball seat;

[0009] The second guide column is connected with the second ball seat; 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 to block the opening A; the other end of the second steel needle is connected with the combined hydraulic control plunger; the combined hydraulic control plunger is slidably connected with the control chamber f; the oil inlet chamber h is connected with the oil return chamber g. The opening A, the chamber j, the oil inlet chamber h, the oil return chamber g and the oil return passage T are connected in sequence.

[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 comprises a first solenoid 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 solenoid 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 inside the first electromagnet; the other end of the first electromagnet push rod enters the first pilot valve body and connects to one end of the first steel ball seat;

[0013] The first steel ball seat and the first steel ball are disposed in 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; the second steel ball is connected to one end of the first guide column;

[0014] The valve body is provided with an oil return chamber d, chamber c, chamber b, chamber a, and chamber b. Chamber c, oil return chamber d, oil passage e, and 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 connected in sequence; the oil return 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] One end of the second electromagnet push rod is connected inside 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 inlet and outlet oil passages P.

[0018] Preferably, a first spring is disposed 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 prior art, the beneficial effects of the present invention are as follows: the harvester full steel ball electromagnetic multi-way valve and the operation method all reversing valves are composed of double ball pilot valves and steel ball hydraulic control check valves, and have 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 It is a schematic diagram of the main structure of the valve body in the present invention;

[0022] Figure 3 It is a schematic diagram of the top view of the valve body in the present invention;

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

[0024] Figure 5 for Figure 2 The cross-section diagram of ABCDE in the figure;

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

[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, sealing member 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 described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1 to Figure 7 ,The present invention provides a technical solution: a harvester full steel ball electromagnetic multi-way valve and an operating method, 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 disposed 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 column 13; the sealing member 11 includes a third steel ball 12 and a second ball seat 14;

[0033] The second ball seat 14 is connected to the second guide column 13; 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. The opening A1, chamber j, oil inlet chamber h, oil return chamber g and oil return passage T1 are connected in sequence.

[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; the other end of the two-way valve is connected to the second electromagnet 27;

[0035] The two-way valve comprises a first solenoid 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 solenoid 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 seat 3 is connected to the first steel ball 4 at the other end; 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, oil return chamber d, oil passage e, and oil passage e1; chamber a, chamber b, chamber c, oil return chamber d, oil passage e, and control chamber f are sequentially connected; oil return chamber d1, chamber c1, chamber b1, and chamber a are sequentially connected; chamber c1 and oil passage e1 are sequentially connected;

[0039] 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 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;

[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 inlet oil 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] The present invention is an integral structure. This embodiment selects a representative 4-way and 7 electromagnets. The other ways are existing structures and will not be described here. Each electromagnet corresponds to a double-ball pilot valve. The unloading valve electromagnet 25 stops, and there is pressure at the unloading P port. When the other 6 electromagnets are energized, the unloading valve electromagnet 25 will also be energized. The opening marked with A1 is the header oil port, which is the large diameter.

[0046] like Figure 4 The figure shows the cross-sectional structure of a large-diameter 3-position 3-way valve, also known as a cutter head, and the oil flow sequence when the oil cylinder descends. 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 column 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 oil return valve port in the pilot valve body 2 through the first steel ball seat 3, so that the control oil chamber C and the oil return chamber d are cut off. 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 there is pressure in the pressure oil channel P. 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. Push 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 the opening A1, causing the opening and chamber j, the oil inlet chamber h to the oil return passage T1 of the 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 the exhibition. Figure 5 The hydraulically controlled one-way valve is embodied in it.

[0050] When the second electromagnet 27 is energized, the second electromagnet push rod 19 causes the fourth steel ball 22 to block the oil return port in the pilot valve body 20 through the third steel ball seat 21, so that the control chamber c1 is cut off from the oil return chamber d1. At the same time, 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, so that the unloading valve stops unloading, so that there is pressure in the pressure oil channel P. The pressure oil flows into chamber a, chamber b1, and chamber c1, and then flows to the control oil channel e1 through the control chamber c1 to send the pressure oil to the control chamber f1 at the right end of the first hydraulic control plunger 16, pushing the first hydraulic control plunger 16 to move to the left. The third steel needle 17 on the plunger pushes the fourth steel ball 18 to allow the pressure oil to enter the oil channel P1 from the oil inlet channel P and then enter the steel ball chamber, and enter the oil inlet chamber h through the steel ball opening. Note that the pressure in the oil inlet chamber h pushes the compound hydraulic control plunger to move to the left to the end point. At this time, the sealing belt of the composite hydraulic control plunger overlaps with the sealing belt between the valve body g chamber and the oil inlet chamber h, separating the g chamber from the oil inlet chamber h. The pressure oil can only rush to the right to open the third steel ball 12 and be discharged from the opening A1.

[0051] The present invention Figure 5In the invention, the hydraulically controlled one-way valve adopts an unconventional design. The conventional design should be that the third steel ball 12 is installed in the direction to prevent the oil in the oil cylinder from falling, commonly known as a hydraulic lock. After unlocking, the oil in the oil cylinder falls. In the present invention, the hydraulically controlled one-way valve composed of the fourth steel ball 18 and the first hydraulically controlled plunger 16 is used in reverse. After the second electromagnet 27 is energized, the hydraulically controlled one-way valve is unlocked to introduce the pressure oil into the oil inlet chamber h to make the oil in the oil cylinder rise. This design omits the 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 cylinder return oil 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 electromagnet 27 is energized, the pressure oil enters the oil inlet chamber h through the opening of the fourth steel ball 18. The pressure oil pushes the composite hydraulic control plunger to the left end position to close the third steel ball 12. At the same time, the switching function of the composite hydraulic control plunger takes effect, cutting off the return oil chamber g and the oil inlet chamber h. The pressure oil can only pass through the oil inlet chamber h to flush the third steel ball 12 and output through the A1 port. This not only saves the slide valve type reversing valve, but also makes the whole multi-way reversing valve without a reversing slide 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 As shown in the third steel ball 12, the second guide column 13 and the second ball seat 14, the first steel ball 4 and the first steel ball seat 3, and the second steel ball 6 and the first guide column 7 are similar structures. The steel ball and the guide column are required to be very concentric. Relying on the process guarantee, the inner ejector must be used to push the press-fit steel ball to grind the outer circle of the guide column to ensure concentricity.

[0055] Figure 3 It can be seen that 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 prior art and will not be described in detail here.

[0056] Working principle:

[0057] The rising path of the 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 a chamber j, and the chamber j has several small holes 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 of the chamber j to push the third steel ball 12 to realize the unlocking function. After unlocking, the internal oil flows through the oil chamber j and 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 composite 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 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 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 return oil chamber g and the oil inlet chamber h are isolated, and the pressure oil can only pass through the oil inlet chamber h and chamber j. The pressure oil rushes 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 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 the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0063] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description 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 may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A harvester full steel ball electromagnetic multi-way valve, 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 disposed 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) are respectively matched 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 also provided inside the valve body; a relief 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 relief 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); 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 inside the first electromagnet (26); 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 column (7); The valve body is provided with an oil return chamber d1, a chamber c1, a chamber b1, a chamber a, a chamber b, a 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 inside 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: 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 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 inlet oil passage P1.

4. A harvester full steel ball electromagnetic multi-way valve according to claim 1, characterized in that: A first spring (8) is arranged inside the first guide column (7); and the second ball seat (14) is connected to the second guide column (13) via a second spring (15).

5. An operating method of the harvester full steel ball electromagnetic multi-way valve according to claim 1, characterized in that: The first electromagnet 26 is energized, and the pressurized oil in the control chamber f pushes the combined hydraulic control plunger 9 to stop at the right end. The second steel needle 10 pushes open the third steel ball 12, and 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 oil return channel T1 connected to the oil return chamber g, realizing oil return, and the oil in the cylinder drops. The second electromagnet 27 is energized, and due to the opening of the fourth steel ball 18, the pressure oil enters the oil inlet chamber h, pushing the combined hydraulic control plunger 9 to the left end. At this time, the oil return chamber g and the oil inlet chamber h are isolated, and the pressure oil can only pass through the oil inlet chamber h and chamber j. The pressure oil breaks open the third steel ball 12 and is output from the opening A1, causing the oil in the cylinder to rise.

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