Electromagnetic directional valve and hydraulic system

Abstract

The utility model relates to a hydraulic valve, in particular to an electromagnetic directional valve and a hydraulic system, the electromagnetic directional valve comprises five logic valves and two electromagnetic valves, and oil outlets of a first logic valve and a third logic valve and oil outlets of a second logic valve and a fourth logic valve are correspondingly communicated with two working oil ports; oil inlets of the first logic valve, the second logic valve and the fifth logic valve are all communicated with the working oil inlet; oil outlets of the third, fourth and fifth logic valves are all communicated with the oil return port; oil outlets of the third logic valve and the fourth logic valve are matched back to back, and valve elements are arranged in an abutting mode; the first electromagnetic valve and the second electromagnetic valve are two-position three-way valves; an oil port C of the first electromagnetic valve is communicated with first and third logic valve spring cavities simultaneously, an oil port D is communicated with second and fourth logic valve spring cavities simultaneously, and an oil port E is communicated with an oil port F of the second electromagnetic valve; and an oil port G and an oil port H of the second electromagnetic valve are correspondingly communicated with a spring cavity and an oil return port of the fifth logic valve. The electromagnetic directional valve is simple in structure, low in manufacturing cost, not prone to clamping stagnation and high in reliability.

Description

Technical Field

[0001] The utility model relates to a hydraulic valve, more specifically, to an electromagnetic reversing valve and a hydraulic system. Background Art

[0002] In hydraulic systems, reversing valves are often used to control the speed and direction of hydraulic actuators. Existing reversing valves often adopt the form of sliding valves, that is, a valve stem is arranged in the valve body, and the oil groove on the valve stem is used to connect the corresponding oil chambers in the valve body. The axial movement of the valve stem changes the connection relationship between the oil chambers to achieve changes in the oil circuit and the flow area of ​​the oil circuit, thereby achieving control of the direction and speed of the hydraulic actuator.

[0003] The reversing valve with a sliding valve structure has a complex structure because it needs to set up many oil chambers in the valve body and cooperate with the valve stem. The valve stem is a slender component and has a clearance with the valve body, which requires high cleanliness of the oil, otherwise sticking may easily occur. In addition, the sliding valve type reversing valve needs to be equipped with a pilot oil source to provide pressure oil for pilot control, and the system cost is high. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide an electromagnetic reversing valve and a hydraulic system.

[0005] The utility model provides a technical solution to achieve its purpose: an electromagnetic reversing valve, which includes a first logic valve, a second logic valve, a third logic valve, a fourth logic valve, a fifth logic valve, a first electromagnetic valve, a second electromagnetic valve, and has a first working oil port, a second working oil port, a working oil inlet port and an oil return port.

[0006] The oil outlet of the first logic valve and the oil inlet of the third logic valve are both in communication with the first working oil port.

[0007] The oil outlet of the second logic valve and the oil inlet of the fourth logic valve are both communicated with the second working oil port.

[0008] The oil inlets of the first logic valve, the second logic valve and the fifth logic valve are all communicated with the working oil inlet.

[0009] The oil outlets of the third logic valve, the fourth logic valve and the fifth logic valve are all communicated with the oil return port.

[0010] The valve cores of the third logic valve and the fourth logic valve are coaxially arranged and are interlocked in opening and closing.

[0011] The first solenoid valve and the second solenoid valve are both two-position three-way valves.

[0012] Among the C oil port, D oil port and E oil port of the first solenoid valve, the C oil port is connected with the spring chambers of the first logic valve and the third logic valve at the same time, the D oil port is connected with the spring chambers of the second logic valve and the fourth logic valve at the same time, the E oil port is connected with the F oil port of the second solenoid valve, and the E oil port is selectively connected with the C oil port or the D oil port.

[0013] Among the F oil port, G oil port and H oil port of the second solenoid valve, the G oil port is connected to the spring chamber of the fifth logic valve, the H oil port is connected to the oil return port, and the H oil port is selectively connected to the F oil port or the G oil port.

[0014] In the electromagnetic reversing valve of the utility model, the oil outlet of the third logic valve is arranged opposite to the oil outlet of the fourth logic valve, and the valve cores of the two are connected to each other. Further, the oil outlet of the third logic valve is connected to the oil outlet of the fourth logic valve opposite to each other, and the valve cores of the two are abutted in the oil outlet; or the valve cores of the two are fixedly connected in the oil outlet.

[0015] In the electromagnetic reversing valve of the utility model, the first electromagnetic valve is configured so that when the power is off, its E oil port is connected to the C oil port and the D oil port is blocked; the second electromagnetic valve is configured so that when the power is off, its F oil port is connected to the H oil port and the G oil port is blocked.

[0016] In the electromagnetic reversing valve of the utility model, the oil inlets of the first logic valve, the second logic valve and the fifth logic valve are connected to the spring chamber via the damping hole.

[0017] In the electromagnetic reversing valve of the utility model, the damping holes in the first logic valve, the second logic valve and the fifth logic valve are respectively arranged in the respective valve cores.

[0018] In the electromagnetic reversing valve of the utility model, the electromagnetic reversing valve includes a valve body, the first working oil port, the second working oil port, the working oil inlet port and the oil return port are all arranged on the valve body, the first logic valve, the second logic valve, the third logic valve, the fourth logic valve, the fifth logic valve, the first solenoid valve, and the second solenoid valve are all cartridge valves and are inserted in the valve body, and a connecting oil path connecting the corresponding oil ports is arranged in the valve body.

[0019] In the electromagnetic reversing valve of the utility model, the third logic valve and the fourth logic valve are arranged in the same cartridge valve.

[0020] The utility model provides a technical solution for achieving the purpose: a hydraulic system, which has the above-mentioned electromagnetic reversing valve.

[0021] Compared with the prior art, the electromagnetic reversing valve of the utility model is formed by combining multiple logic valves and electromagnetic valves, does not need a pilot oil circuit for control, has low manufacturing cost, simple logic valve structure, is not easy to get stuck during operation, and has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a principle diagram of the electromagnetic reversing valve of the utility model.

[0023] Figure 2 It is a schematic diagram of the hydraulic system of the utility model.

[0024] Parts names and serial numbers in the figure:

[0025] The electromagnetic reversing valve 10 , the first logic valve 11 , the second logic valve 12 , the third logic valve 13 , the fourth logic valve 14 , the fifth logic valve 15 , the first electromagnetic valve 21 , and the second electromagnetic valve 22 .

[0026] Hydraulic oil tank 3, hydraulic pump 4, hydraulic actuator 5. DETAILED DESCRIPTION

[0027] The specific implementation scheme is described below with reference to the accompanying drawings.

[0028] like Figure 1 As shown, the solenoid reversing valve in this embodiment includes a first logic valve 11, a second logic valve 12, a third logic valve 13, a fourth logic valve 14, a fifth logic valve 15, a first solenoid valve 21, and a second solenoid valve 22, and has a first working oil port (A oil port), a second working oil port (B oil port), a working oil inlet port (P oil port) and an oil return port (T oil port).

[0029] The oil outlet of the first logic valve 11 and the oil inlet of the third logic valve 13 are both connected to the first working oil port (A oil port).

[0030] The oil outlet of the second logic valve 12 and the oil inlet of the fourth logic valve 14 are both connected to the second working oil port (B oil port).

[0031] The oil inlets of the first logic valve 11 , the second logic valve 12 , and the fifth logic valve 15 are all connected to the working oil inlet (P oil port).

[0032] The oil outlets of the third logic valve 13 , the fourth logic valve 14 , and the fifth logic valve 15 are all connected to the oil return port (T oil port).

[0033] The valve cores of the third logic valve 13 and the fourth logic valve 14 are coaxially arranged and interlocked. Interlocking means that when one of the two logic valves is turned on, the other logic valve is turned off, that is, in the third logic valve 13 and the fourth logic valve 14, when the valve core of one of the logic valves (valve one) moves from the open state to the closed state under the action of the hydraulic oil pressure in its spring chamber and the elastic force of the spring, the valve core of the logic valve (valve one) will push the valve core of the other logic valve (valve two) to move, so that the other logic valve (valve two) changes from the closed state to the conducting state, so that there is an interlock between the conduction and closure of the two logic valves.

[0034] Optionally, the oil outlet of the third logic valve 13 is arranged opposite to the oil outlet of the fourth logic valve 14 and the valve cores of the two are connected top to top. The oil outlet of the third logic valve 13 and the oil outlet of the fourth logic valve 14 can be connected through an oil channel, or can be connected directly, that is, the third logic valve 13 and the fourth logic valve 14 share an oil outlet, and the valve cores of the two are connected in the oil outlet. The valve cores of the two logic valves can be abutted, that is, when the valve core of one of the logic valves (valve one) moves toward the direction of the other logic valve (valve two), the valve cores of the two are abutted and move together; when the valve core of one of the logic valves (valve one) moves away from the direction of the other logic valve (valve two), the valve cores of the two are disengaged. In some embodiments, the valve core of the third logic valve 13 and the valve core of the fourth logic valve 14 can also be fixedly connected together.

[0035] The first solenoid valve 21 and the second solenoid valve 22 are both two-position three-way valves. Among the C oil port, D oil port and E oil port of the first solenoid valve 21, the C oil port is connected to the spring chambers of the first logic valve 11 and the third logic valve 13 at the same time, the D oil port is connected to the spring chambers of the second logic valve 12 and the fourth logic valve 14 at the same time, the E oil port is connected to the F oil port of the second solenoid valve 22, and the E oil port is selectively connected to the C oil port or the D oil port;

[0036] Among the F oil port, G oil port and H oil port of the second solenoid valve 22, the G oil port is connected to the spring chamber of the fifth logic valve 15, the H oil port is connected to the return oil port (T oil port), and the H oil port is selectively connected to the F oil port or the G oil port.

[0037] The first solenoid valve 21 is configured such that when the power is off, its E oil port is connected to the C oil port and the D oil port is blocked; the second solenoid valve 22 is configured such that when the power is off, its F oil port is connected to the H oil port and the G oil port is blocked.

[0038] The oil inlets of the first logic valve 11 , the second logic valve 12 , and the fifth logic valve 15 are connected to the spring chamber via a damping hole, and the damping hole is arranged on the valve core of each logic valve.

[0039] Optionally, the solenoid reversing valve includes a valve body, (A oil port), the second working oil port (B oil port), the working oil inlet port (P oil port) and the oil return port (T oil port) are all arranged on the valve body, the first logic valve 11, the second logic valve 12, the third logic valve 13, the fourth logic valve 14, the fifth logic valve 15, the first solenoid valve 21, and the second solenoid valve 22 are all cartridge valves and are inserted in the valve body, and a connecting oil path connecting the corresponding oil ports is arranged in the valve body. Further, the third logic valve 13 and the fourth logic valve 14 are arranged in the same cartridge valve.

[0040] This embodiment also provides a hydraulic system, such as Figure 2 As shown, it has the aforementioned electromagnetic reversing valve 10, and also includes a hydraulic oil tank 3, a hydraulic pump 4 whose oil suction port is connected to the hydraulic oil tank 3, and a hydraulic actuator 5. The pump port of the hydraulic pump 4 is connected to the working oil inlet (P port) of the aforementioned electromagnetic reversing valve 10 through a pipeline, and the oil return port (T port) of the electromagnetic reversing valve 10 is connected to the hydraulic oil tank 3. The hydraulic actuator 5 can be a hydraulic cylinder or a hydraulic motor, etc., and its two working interfaces are connected to the first working oil port (A port) and the second working oil port (B port) of the electromagnetic reversing valve.

[0041] The working principle of the electromagnetic reversing valve in this embodiment is as follows:

[0042] When the first solenoid valve 21 and the second solenoid valve 22 are not powered, in the first solenoid valve 21, the C oil port and the E oil port are connected, and the D oil port is cut off. In the second solenoid valve 22, the F oil port and the H oil port are connected, and the G oil port is cut off. The oil in the spring chamber of the first logic valve 11 returns through the first solenoid valve 21 and the second solenoid valve 22, the first logic valve 11 is opened, the working oil inlet (P oil port) is connected with the first working oil port (A oil port) through the first logic valve 11, and the first working oil port (A oil port) flows out the pressure oil toward the hydraulic actuator 5; at the same time, the spring chamber of the third logic valve 13 also returns through the first solenoid valve 21 and the second solenoid valve 22. At the same time, the oil in the spring chamber of the second logic valve 12 and the spring chamber of the fourth logic valve 14 are cut off by the first solenoid valve 1, and the second logic valve 12 is closed under the action of the hydraulic pressure in its spring chamber and the spring force, and the oil circuit between the working oil inlet (P oil port) and the second working oil port (B oil port) is closed and cut off. The fourth logic valve 14, under the action of the hydraulic pressure in its spring chamber and the spring force, pushes the valve core of the third logic valve 13 to move in the direction of the open state, and the third logic valve 13 is opened, and the oil circuit between the second working oil port (B oil port) and the return oil port (T oil port) is connected through the third logic valve 13, and the second working oil port (B oil port) returns oil.

[0043] When the first solenoid valve 1 is energized and the second solenoid valve 7 is not energized, in the first solenoid valve 21, the D oil port and the E oil port are connected, and the C oil port is cut off. In the second solenoid valve, the F oil port and the H oil port are connected, and the G oil port is cut off. The oil in the spring chamber of the second logic valve 12 returns oil through the first solenoid valve 21 and the second solenoid valve 22, the second logic valve 12 is opened, the oil path between the working oil inlet (P oil port) and the second working oil port (B oil port) is connected through the second logic valve 12, and the second working oil port (B oil port) outputs working pressure oil to the hydraulic actuator 5; at the same time, the spring chamber of the fourth logic valve 14 also returns oil through the first solenoid valve 21 and the second solenoid valve 22. At the same time, the high-pressure oil in the spring chamber of the first logic valve 11 and the spring chamber of the third logic valve 13 are cut off by the first solenoid valve 21, and the first logic valve 11 is closed under the action of the hydraulic pressure and spring force of the spring chamber, and the oil circuit between the working oil inlet (P oil port) and the first working oil port (A oil port) is closed. Under the action of the hydraulic pressure and spring force of the spring chamber, the third logic valve 13 pushes the valve core of the fourth logic valve 14 to move in the direction of opening the fourth logic valve 14, and the fourth logic valve 14 is opened. The oil circuit between the first working oil port (A oil port) and the oil return port (T oil port) is connected through the fourth logic valve 14, and the oil in the first working oil port (A oil port) returns.

[0044] When the second solenoid valve 22 is not energized, the oil in the spring chamber of the fifth logic valve 15 is cut off by the second solenoid valve 7, and the fifth logic valve 15 is closed under the action of the oil pressure in its spring chamber and the spring force.

[0045] When the second solenoid valve 21 is energized: the oil in the spring chamber of the fifth logic valve 15 is connected to the oil return port through the second solenoid valve 7 and the fifth logic valve 15 is opened under the hydraulic pressure of the working oil inlet (P oil port) and connected to the oil return port (T oil port). Since the F oil port of the second solenoid valve 22 is cut off, at this time, whether the first solenoid valve 21 is energized or not, the oil circuit between the C oil port and the D oil port of the first solenoid valve 21 and the oil return port (T oil port) is cut off, the hydraulic oil in the spring chamber of the first logic valve 11 and the second logic valve 12 is always cut off by the first solenoid valve 21 and the second solenoid valve 22, the first logic valve 11 and the second logic valve 12 are always in a closed state, the oil circuit between the first working oil port (A oil port) and the second working oil port (B oil port) and the working oil inlet (P oil port) is cut off, the hydraulic system is in a unloading state, and the pressure oil output by the hydraulic pump 4 is unloaded through the fifth logic valve 15 of the electromagnetic reversing valve.

[0046] In this embodiment, the main oil circuit is composed of a logic valve, and the control oil circuit is composed of a solenoid valve. No pilot oil circuit is required for control, and the manufacturing cost is low. There is no slender valve stem in the valve structure, and it is not easy to get stuck during operation, and the reliability is high.

Claims

1. An electromagnetic reversing valve, characterized in that: It includes a first logic valve, a second logic valve, a third logic valve, a fourth logic valve, a fifth logic valve, a first solenoid valve, a second solenoid valve, and has a first working oil port, a second working oil port, a working oil inlet port and an oil return port; The oil outlet of the first logic valve and the oil inlet of the third logic valve are both connected to the first working oil port; The oil outlet of the second logic valve and the oil inlet of the fourth logic valve are both connected to the second working oil port; The oil inlets of the first logic valve, the second logic valve and the fifth logic valve are all connected to the working oil inlet; The oil outlets of the third logic valve, the fourth logic valve and the fifth logic valve are all connected to the oil return port; The valve cores of the third logic valve and the fourth logic valve are coaxially arranged and interlocked in opening and closing; The first solenoid valve and the second solenoid valve are both two-position three-way valves; Among the C oil port, D oil port and E oil port of the first solenoid valve, the C oil port is communicated with the spring chambers of the first logic valve and the third logic valve at the same time, the D oil port is communicated with the spring chambers of the second logic valve and the fourth logic valve at the same time, the E oil port is communicated with the F oil port of the second solenoid valve, and the E oil port is selectively connected to the C oil port or the D oil port; Among the F oil port, G oil port and H oil port of the second solenoid valve, the G oil port is connected to the spring chamber of the fifth logic valve, the H oil port is connected to the oil return port, and the H oil port is selectively connected to the F oil port or the G oil port.

2. The electromagnetic reversing valve according to claim 1, characterized in that: The oil outlet of the third logic valve is arranged opposite to the oil outlet of the fourth logic valve, and the valve cores of the two valves are connected top to top.

3. The electromagnetic reversing valve according to claim 2, characterized in that: The oil outlet of the third logic valve is directly connected to the oil outlet of the fourth logic valve, and the valve cores of the two valves are in contact with each other in the oil outlets.

4. The electromagnetic reversing valve according to claim 2, characterized in that: The oil outlet of the third logic valve is directly connected to the oil outlet of the fourth logic valve, and the valve cores of the two are fixedly connected in the oil outlets.

5. The electromagnetic reversing valve according to claim 1, characterized in that: The first solenoid valve is configured so that when the power is off, its E oil port is connected to the C oil port and the D oil port is blocked; the second solenoid valve is configured so that when the power is off, its F oil port is connected to the H oil port and the G oil port is blocked.

6. The electromagnetic reversing valve according to claim 1, characterized in that: The oil inlets of the first logic valve, the second logic valve and the fifth logic valve are connected to the spring chamber via a damping hole.

7. The electromagnetic reversing valve according to claim 6, characterized in that: The respective damping holes in the first logic valve, the second logic valve and the fifth logic valve are arranged in the respective valve cores.

8. The electromagnetic reversing valve according to any one of claims 1 to 7, characterized in that: The solenoid reversing valve includes a valve body, and the first working oil port, the second working oil port, the working oil inlet port and the oil return port are all arranged on the valve body. The first logic valve, the second logic valve, the third logic valve, the fourth logic valve, the fifth logic valve, the first solenoid valve and the second solenoid valve are all cartridge valves and are inserted in the valve body. A connecting oil path connecting the corresponding oil ports is arranged in the valve body.

9. The electromagnetic reversing valve according to claim 8, characterized in that: The third logic valve and the fourth logic valve are arranged in the same cartridge valve.

10. A hydraulic system, characterized in that: A solenoid reversing valve according to any one of claims 1 to 9.

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