Mechanical and electromagnetic integrated multi-way directional valve

Abstract

The application discloses a mechanical and electromagnetic integrated multi-way reversing valve, comprising an oil inlet body, one or more manual reversing valve pieces, one or more electric control valve pieces, one or more electric control valve pieces two, and an oil return cover plate, wherein the manual reversing valve piece is a three-position six-way middle O-shaped manual reversing valve piece, the electric control valve piece one is a three-position four-way middle O-shaped electromagnetic reversing valve piece, the electric control valve piece two is a three-position four-way middle H-shaped unloading electromagnetic reversing valve piece, and the corresponding A port oil channel and B port oil channel of the electric control valve piece two are respectively connected with double stop electromagnetic valves, the double stop electromagnetic valves are normally closed and are turned on when powered, and the electric control valve piece one is matched with the reversing action of the electric control valve piece two when powered. The multi-way reversing valve can realize any combination operation of mechanical and electromagnetic control of large horsepower tractor accessories, has the characteristics of platformization, high universality, simple and reliable structure, and the like, and can avoid cost waste and realize practicality and intelligent control.

Description

TECHNICAL FIELD

[0001] The present application relates to a mechanical and electromagnetic integrated multi-way directional valve. BACKGROUND

[0002] Agricultural machinery equipment is an indispensable tool to improve the efficiency of agricultural production, and plays a very important role in promoting agricultural yield and efficiency. Higher requirements are put forward for the scientization and intelligentization of agricultural equipment. However, the control mode of domestic tractor hydraulic suspension system is still mainly manual multi-way valve. This mechanical operation mode not only consumes a lot of physical strength of the operator, but also has low production efficiency, and hinders the intelligentization of the whole vehicle.

[0003] Foreign advanced tractors have entered the era of full electric-hydraulic control operation. The popularization of full electric control operation of multi-way valve is not very realistic for the current tractor industry. First, the cost increase brought by full electric control operation of hydraulic system is relatively high. Second, according to the actual working condition of tractors, not all operations need to be electrically controlled. Therefore, a new design idea is needed to solve this problem. SUMMARY

[0004] The purpose of the present application is a mechanical and electromagnetic integrated multi-way directional valve to meet the use requirements of various types of tractor attachments.

[0005] To this end, the present application provides a mechanical and electromagnetic integrated multi-way directional valve, which comprises an oil inlet body, one or more manual directional valve pieces, one or more electric control valve pieces one, one electric control valve piece two, and an oil return cover plate. The manual directional valve piece is a three-position six-way middle O-type manual directional valve piece. The electric control valve piece one is a three-position four-way middle O-type electromagnetic directional valve piece. The electric control valve piece two is a three-position four-way middle H-type unloading electromagnetic directional valve piece, and its corresponding A port oil channel and B port oil channel are respectively connected in series with a double stop electromagnetic valve. The double stop electromagnetic valve is normally closed and conducts when powered. The electric control valve piece one cooperates with the directional action of the electric control valve piece two when it is actuated.

[0006] The multi-way directional valve of the present application can realize any combination operation of mechanical and electromagnetic control of large horsepower tractor attachment work, realize the control design of mechatronic multi-way valve, take into account the practicability and intelligent control, and avoid cost waste. The valve body cavity adopts mechanical-electromagnetic control integrated design, has the characteristics of platformization, high universality, simple and reliable structure, etc.

[0007] In addition to the purposes, features and advantages described above, the present application has other purposes, features and advantages. The present application will be further described below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0008] The drawings accompanying the specification of this application serve to provide further understanding of the present application, the illustrative embodiments thereof, and its description, and do not constitute an improper limitation of the present application. In the drawings:

[0009] Figure 1 is a schematic diagram of the plane layout of each valve disc in the multi-way directional valve provided by the embodiment of the present application;

[0010] Figure 2 is a left view of the multi-way directional valve shown in Figure 1 ;

[0011] Figure 3 is a hydraulic principle diagram of the multi-way directional valve provided by the embodiment of the present application;

[0012] Figure 4 is a structural schematic diagram of the oil inlet body of the multi-way directional valve provided by the embodiment of the present application;

[0013] Figure 5 is a structural schematic diagram of the manual directional valve disc of the multi-way directional valve provided by the embodiment of the present application;

[0014] Figure 6 is a structural schematic diagram of the electric control valve disc one of the multi-way directional valve provided by the embodiment of the present application;

[0015] Figure 7 is a structural schematic diagram of the electric control valve disc two of the multi-way directional valve provided by the embodiment of the present application. DETAILED DESCRIPTION

[0016] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0017] In the process of implementing the present application, the present inventors found that various implements of the tractor can be divided into frequently operated implements and less frequently operated implements. Therefore, the present application controls the operation of the frequently operated implements by electromagnetism and controls the operation of the less frequently operated implements by hand. Through such combined operation, both cost saving and liberation of the operator from frequent mechanical operation are achieved.

[0018] In combination with reference Figures 1 to 3 to the accompanying drawings, the multi-way directional valve of the present application comprises an oil inlet body 1, one or more manual directional valve discs 2 / 3, one or more electric control valve discs one 4, one electric control valve disc two 5, and an oil return cover plate 6.

[0019] The functions of each valve disc are set as follows: the mechanical operation valve disc (manual directional valve disc) can realize the up, middle, and down control of the implement; the electric control operation valve disc is divided into two groups, one group (electric control valve disc one) realizes the up, middle, and down control of the implement, and the other group (electric control valve disc two) realizes the up, middle, and down, and floating control of the implement.

[0020] In order to realize the design requirements of simple and reliable reversing valve structure, platformization and high universality, we select specific structure of valve and combine these valves together to form a multi-way reversing valve which can meet the different operation frequency requirements of tractor accessories.

[0021] An overflow valve 11 is arranged on the oil inlet body 1, and the structure of the oil inlet body is shown in Figure 4 .

[0022] The manual reversing valve 2 is more than one joint, and in this embodiment, it is two joints, each of which selects a three-position four-way O-type oil valve core. The manual reversing valve 2 includes a valve body 21, a valve core 22, a one-way valve 23, a valve core elastic recovery assembly 24, and additionally, a bypass oil passage 25 is arranged between the corresponding A port oil passage and the oil return passage, and an oil passage switch 26 is arranged on the bypass oil passage. When the oil passage switch is operated to open, the A1 port is communicated with the T port, thereby controlling the accessories to rely on the gravity to drop, which is very useful when plowing in soft soil. The structure of the manual reversing valve is shown in Figure 5 .

[0023] The electric control valve one 4 is more than one joint, and in this embodiment, it is one joint. The valve core of the electric control valve one is a three-position four-way O-type electromagnetic reversing valve. The electric control valve one 4 includes a valve body 41, a valve core 42, plugs 43 / 44, an electromagnetic valve DT1 and an electromagnetic valve DT2. The structure of the electric control valve one is shown in Figure 6 .

[0024] The electric control valve two is one joint, and the valve core of the electric control valve two is a three-position four-way H-type unloading electromagnetic reversing valve. The reversing valve two includes a valve body 51, a valve core 52, an electromagnetic valve DT3 and an electromagnetic valve DT4. The corresponding A port oil passage and B port oil passage are respectively connected in series with double block electromagnetic valves DT5 / DT6. The structure of the electric control valve two is shown in Figure 7 .

[0025] The valve body structures of the electric control valve one and the electric control valve two are the same, and the difference lies in that the double block electromagnetic valves (cartridge valves) of the electric control valve two are replaced by plugs, and the lengths of the two symmetrical oil passage sealing sections in the middle of the valve cores of the electric control valve one and the electric control valve two are different. The lengths of the two symmetrical oil passage sealing sections in the middle of the valve core of the electric control valve one are longer, and the middle position oil inlet passage and the oil return passage are not communicated, while the lengths of the two symmetrical oil passage sealing sections in the middle of the valve core of the electric control valve two are shorter, and the middle position oil inlet passage and the oil return passage are communicated.

[0026] The electric control valve two is sealed by the oil return cover plate 6, which is a solid plate without any oil passage arranged thereon.

[0027] The operation of each valve is as follows: Due to the flow limitation of the multi-way directional valve, only one valve is allowed to operate at a time. When the manual directional valve is activated, the other subsequent valves stop operating, i.e., no oil is supplied to the other valves. When the electrically controlled valve one is activated, DT3 of the electrically controlled valve two is energized. When the electrically controlled valve two is activated, the double-stop solenoid valves DT5 / DT6 are activated, opening the corresponding ports A and B.

[0028] The sequence of solenoid valve actions during the reversing action of the electronically controlled valve plate is shown in Table 1 below.

[0029] Table 1

[0030]

[0031] The sequence of solenoid valve actions during the reversing action of the second electrically controlled valve plate is shown in Table 2 below.

[0032] Table 2

[0033]

[0034] The multi-way directional valve in the above embodiments can realize any combination of mechanical and electromagnetic control operations for the operation of attachments of high-horsepower tractors, realize the mechatronics integrated multi-way valve control design, and the multi-way directional valve has the advantages of high platformization, strong versatility, and simple and reliable structure.

[0035] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A mechanically and electromagnetically integrated directional multi-way valve, characterized in that, This includes an oil inlet body, one or more manual directional valves, one or more electrically controlled valves (one unit), one electrically controlled valve (two units), and a return cover. The manual directional valve is a three-position, six-way, center-position O-type manual directional valve for oil passage. The first electrically controlled valve plate is a three-position four-way neutral-position O-type solenoid directional valve plate, and the second electrically controlled valve plate is a three-position four-way neutral-position H-type unloading solenoid directional valve plate, with its corresponding A-port oil passage and B-port oil passage each connected in series with a double-stop solenoid valve. The double-stop solenoid valve is normally closed and opens when energized. Due to the flow limitation of the multi-way directional valve, only one valve plate is allowed to work at a time. When the manual directional valve is activated, the other subsequent valve plates stop operating, that is, no oil is supplied to the other subsequent valve plates. When the first electrically controlled valve plate is activated, the second electrically controlled valve plate cooperates in the directional operation. When the second electrically controlled valve plate is activated, the double shut-off solenoid valves connected in series in its A port oil passage and B port oil passage are activated, opening the corresponding A port and B port.

2. The mechanically and electromagnetically integrated reversing multi-way valve according to claim 1, characterized in that, The two electrically controlled valve plates, namely valve plate one and valve plate two, have the same valve body structure and are interchangeable.

3. The mechanically and electromagnetically integrated reversing multi-way valve according to claim 1, characterized in that, The manual reversing valve includes two valves, one of which is a single valve and the other is a single valve.

4. The mechanically and electromagnetically integrated reversing multi-way valve according to claim 1, characterized in that, The reversing multi-way valve is a valve used for tractor and agricultural machinery attachments.

5. The mechanically and electromagnetically integrated reversing multi-way valve according to claim 4, characterized in that, The manual directional valve is used for controlling the lifting, neutral, and lowering of the attachment cylinder, and a bypass oil passage is provided between its A-port oil passage and the return oil passage. An oil passage switch is installed on this bypass oil passage. The electronically controlled valve plate is used for the lifting, neutral, and lowering control of the attachment cylinder. The second electrically controlled valve plate is used for the lifting, neutral, lowering, and floating control of the attachment cylinder. During floating control, the double-stop solenoid valves of its A port oil passage and B port oil passage are opened respectively.

6. The mechanically and electromagnetically integrated reversing multi-way valve according to claim 4, characterized in that, The first and second electrically controlled valve plates are adapted to the attachments with a first operating frequency, and the manual reversing valve plate is adapted to the attachments with a second operating frequency, wherein the first operating frequency is greater than the second operating frequency.

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