Pilot control oil way and hydraulic system of hydraulic machine

Abstract

The utility model discloses a pilot control oil way and a hydraulic system of a hydraulic machine, the pilot control oil way comprises a first oil way, a pressure reducing valve, a one-way valve, a filter, a second oil way, a stop valve, an energy accumulator and a bypass oil way, the first oil way is communicated with an external main oil way, an inlet of the pressure reducing valve is communicated with the first oil way, and an outlet of the one-way valve is communicated with the bypass oil way. An outlet of the pressure reducing valve is communicated with an inlet of the one-way valve, an outlet of the one-way valve is communicated with an inlet of the filter, an outlet of the filter is communicated with one end of the second oil way, the other end of the second oil way is communicated with a pilot execution piece, and a branch of the second oil way is communicated with the stop valve. And the inlet of the energy accumulator is connected between the inlet of the filter and the outlet of the one-way valve. The hydraulic system of the hydraulic machine comprises the pilot control oil way. According to the utility model, the independent adjustment can be realized, and the influence of the load fluctuation of the main oil path is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems of hydraulic presses, in particular to a pilot control oil circuit and a hydraulic system of a hydraulic press. Background Art

[0002] With the continuous development of high-end manufacturing, enterprises have higher and higher requirements for the precision of mechanical manufacturing, and have higher requirements for the response speed and movement accuracy of mechanical manufacturing equipment. The pilot control oil circuit in the hydraulic system of traditional hydraulic presses is usually directly led out from the main oil circuit. Under this structure, since the pressure of the pilot control oil circuit is affected by the load of the main oil circuit, the pilot oil circuit of the traditional structure cannot independently adjust its pressure, which means that under different working conditions, the pressure of the pilot oil circuit cannot be flexibly adjusted or controlled, which limits the application range of the system and the possibility of performance optimization. Moreover, the load changes in the oil circuit will be transmitted to the actuator through the pilot control oil circuit. When the load changes greatly, the pressure of the pilot oil circuit will also fluctuate, resulting in unstable movement of the actuator or failure to adjust as expected. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a pilot control oil circuit which can realize independent regulation and will not be affected by the load fluctuation of the main oil circuit.

[0004] In order to solve the above technical problems, the utility model provides a pilot control oil circuit, including a first oil circuit, a pressure reducing valve, a one-way valve, a filter and a second oil circuit, the first oil circuit is connected to an external main oil circuit, the inlet of the pressure reducing valve is connected to the first oil circuit, the outlet of the pressure reducing valve is connected to the inlet of the one-way valve, the outlet of the one-way valve is connected to the inlet of the filter, the outlet of the filter is connected to one end of the second oil circuit, and the other end of the second oil circuit is connected to the pilot actuator.

[0005] As an improvement of the above scheme, the pilot control oil circuit also includes a stop valve, a branch of the second oil circuit is connected to the stop valve, one end of the stop valve is connected to the pilot actuator through the second oil circuit, and the other end of the stop valve is connected to an external oil tank.

[0006] As an improvement of the above solution, the pilot control oil circuit further includes an accumulator, and the inlet of the accumulator is connected between the filter inlet and the one-way valve outlet.

[0007] As an improvement of the above solution, the pilot control oil circuit also includes a bypass oil circuit, a branch of the second oil circuit is connected to the bypass oil circuit, and the bypass oil circuit is connected to the stop valve.

[0008] As an improvement of the above solution, the pilot control oil circuit also includes a pressure gauge, which is connected to the bypass oil circuit and the second oil circuit in sequence, and the pressure gauge is connected to the pilot actuator through the bypass oil circuit and the second oil circuit.

[0009] As an improvement of the above solution, the filtering accuracy of the filter is not greater than 15μ.

[0010] As an improvement of the above solution, the stop valve is an electromagnetically controlled cone valve or a manually controlled cone valve.

[0011] The utility model also provides a hydraulic system of a hydraulic press, comprising the pilot control oil circuit as described above.

[0012] The implementation of this utility model has the following beneficial effects:

[0013] The utility model provides a pilot control oil circuit with a first oil circuit, a pressure reducing valve, a one-way valve, a filter and a second oil circuit, wherein the first oil circuit is connected to an external main oil circuit, the inlet of the pressure reducing valve is connected to the first oil circuit, the outlet of the pressure reducing valve is connected to the inlet of the one-way valve, the one-way valve is connected to a pilot actuator through the filter and the second oil circuit, the pressure reducing valve and the one-way valve can isolate the pilot control oil circuit from the main oil circuit, and the pressure reducing valve can independently adjust the pressure in the pilot control oil circuit, thereby isolating the influence of load fluctuations in the main oil circuit, realizing independent adjustment, and meeting different working conditions of the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the pilot control oil circuit of the utility model. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail with reference to the accompanying drawings. It is hereby stated that the directional words such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the utility model are only based on the accompanying drawings of the utility model, and are not specific limitations of the utility model.

[0016] See also Figure 1The embodiment of the utility model discloses a pilot control oil circuit, comprising a first oil circuit 1, a pressure reducing valve 2, a one-way valve 3, a filter 4 and a second oil circuit 5. The first oil circuit 1 is communicated with an external main oil circuit 10, and the external main oil circuit 10 can input hydraulic oil to the pilot control oil circuit through the first oil circuit 1. The inlet P1 of the pressure reducing valve 2 is communicated with the first oil circuit 1, the outlet P2 of the pressure reducing valve 2 is communicated with the inlet A1 of the one-way valve 3, and the outlet A2 of the one-way valve 3 is communicated with the inlet B1 of the filter 4. The pressure reducing valve 2, the one-way valve 3 and the filter 4 are connected in series. The pressure reducing valve 2 can reduce the pressure from the external main oil circuit 10, and the one-way valve 3 can prevent the main oil circuit 10 from absorbing oil from the pilot control oil circuit. Therefore, the pressure reducing valve 2 and the one-way valve 3 cooperate to isolate the pilot control oil circuit from the main oil circuit 10 while being able to obtain the hydraulic oil input, so as to prevent the pilot control oil circuit from being affected by the pressure change of the main oil circuit 10. The pressure reducing valve 2 can adjust the overall pressure of the pilot control oil circuit to match different response speeds and meet different working conditions of the hydraulic system. The outlet B2 of the filter 4 is connected to one end of the second oil circuit 5, and the other end of the second oil circuit 5 is connected to the pilot actuator. The filter 4 can filter the hydraulic oil to ensure that the pilot control oil circuit operates stably and cleanly.

[0017] The beneficial effects of the embodiments of the present utility model are as follows:

[0018] The pilot control oil circuit of the utility model embodiment is provided with a first oil circuit 1, a pressure reducing valve 2, a one-way valve 3, a filter 4 and a second oil circuit 5, wherein the first oil circuit 1 is connected with an external main oil circuit 10, the inlet of the pressure reducing valve 2 is connected with the first oil circuit 1, the outlet of the pressure reducing valve 2 is connected with the inlet of the one-way valve 3, the one-way valve 3 is connected with the pilot actuator through the filter 4 and the second oil circuit 5, the pressure reducing valve 2 and the one-way valve 3 can isolate the pilot control oil circuit from the main oil circuit 10, and the pressure reducing valve 2 can independently adjust the pressure in the pilot control oil circuit, thereby isolating the influence of load fluctuation of the main oil circuit 10, realizing independent adjustment, and meeting different working conditions of the hydraulic system.

[0019] Specifically, the pilot control oil circuit also includes a stop valve 6, a branch of the second oil circuit 5 is connected to the stop valve 6, one end C1 of the stop valve 6 is connected to the pilot actuator through the second oil circuit 5, and the other end C2 of the stop valve 6 is connected to the external oil tank. When the system is shut down or in an emergency, the pressure of the pilot control oil circuit can be released in time, thereby ensuring the safety of the system.

[0020] In addition, the pilot control oil circuit also includes an accumulator 7, the inlet of the accumulator 7 is connected between the inlet of the filter 4 and the outlet of the one-way valve 3, and the accumulator 7 can ensure the stability of the overall pressure of the pilot control oil circuit. When the components in the system are switched or the load suddenly changes, the accumulator 7 can buffer the pressure changes of the hydraulic oil, avoiding large pressure fluctuations in the pilot control oil circuit, thereby providing more stable control.

[0021] The pilot control oil circuit also includes a bypass oil circuit 8, a branch of the second oil circuit 5 is connected to the bypass oil circuit 8, and the bypass oil circuit 8 is connected to the stop valve 6, so that the stop valve 6 can timely control the pressure of the pilot control oil circuit. The stop valve 6 is preferably an electromagnetically controlled cone valve or a manually controlled cone valve. The electromagnetically controlled cone valve can realize automatic control and has high stability; the manually controlled cone valve is simple and convenient to operate and does not require additional electrical or control equipment.

[0022] In order to facilitate the observation of the oil circuit pressure of the pilot control oil circuit, the pilot control oil circuit also includes a pressure gauge 9, which is connected to the bypass oil circuit 8 and the second oil circuit 5 in sequence. The pressure gauge 9 is connected to the pilot actuator through the bypass oil circuit 8 and the second oil circuit 5. The pressure gauge 9 can reflect the actual pressure of the pilot actuator and play a role in observation and monitoring.

[0023] In the embodiment of the utility model, the filtering accuracy of the filter 4 is not greater than 15μ, which can achieve a good filtering effect, thereby keeping the oil circuit clean and ensuring the stability of the system.

[0024] An embodiment of the utility model also discloses a hydraulic system of a hydraulic press, comprising the pilot control oil circuit as described above, wherein the pilot control oil circuit is provided with a first oil circuit 1, a pressure reducing valve 2, a one-way valve 3, a filter 4 and a second oil circuit 5, wherein the first oil circuit 1 is connected to an external main oil circuit 10, the inlet of the pressure reducing valve 2 is connected to the first oil circuit 1, the outlet of the pressure reducing valve 2 is connected to the inlet of the one-way valve 3, the one-way valve 3 is connected to the pilot actuator through the filter 4 and the second oil circuit 5, the pressure reducing valve 2 and the one-way valve 3 can isolate the pilot control oil circuit from the main oil circuit 10, thereby realizing independent regulation, and the pressure reducing valve 2 can independently regulate the pressure in the pilot control oil circuit without being affected by the load fluctuation of the main oil circuit 10, so as to meet the needs of the hydraulic system under different working conditions.

[0025] The above are preferred implementations of the present utility model. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present utility model. These improvements and modifications are also considered to be within the protection scope of the present utility model.

Claims

1. A pilot control oil circuit, characterized in that: It includes a first oil circuit, a pressure reducing valve, a one-way valve, a filter and a second oil circuit, the first oil circuit is connected to an external main oil circuit, the inlet of the pressure reducing valve is connected to the first oil circuit, the outlet of the pressure reducing valve is connected to the inlet of the one-way valve, the outlet of the one-way valve is connected to the inlet of the filter, the outlet of the filter is connected to one end of the second oil circuit, and the other end of the second oil circuit is connected to a pilot actuator.

2. The pilot control oil circuit according to claim 1, characterized in that: The pilot control oil circuit also includes a stop valve, a branch of the second oil circuit is connected to the stop valve, one end of the stop valve is connected to the pilot actuator through the second oil circuit, and the other end of the stop valve is connected to an external oil tank.

3. The pilot control oil circuit according to claim 2, characterized in that: The pilot control oil circuit further includes an accumulator, the inlet of the accumulator is connected between the filter inlet and the one-way valve outlet.

4. The pilot control oil circuit according to claim 2, characterized in that: The pilot control oil circuit further includes a bypass oil circuit, a branch of the second oil circuit is in communication with the bypass oil circuit, and the bypass oil circuit is in communication with the shut-off valve.

5. The pilot control oil circuit according to claim 4, characterized in that: The pilot control oil circuit further includes a pressure gauge, which is sequentially connected to the bypass oil circuit and the second oil circuit, and the pressure gauge is connected to the pilot actuator through the bypass oil circuit and the second oil circuit.

6. The pilot control oil circuit according to claim 2, characterized in that: The filtering accuracy of the filter is no more than 15μ.

7. The pilot control oil circuit according to claim 2, characterized in that: The stop valve is an electromagnetically controlled cone valve or a manually controlled cone valve.

8. A hydraulic system of a hydraulic press, characterized in that: It comprises the pilot control oil circuit as described in any one of claims 1 to 7.

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