Hydraulic oil control loop for preventing impact of hydraulic motor

Abstract

The utility model relates to an anti-impact hydraulic oil control loop of a hydraulic motor, which comprises the hydraulic motor, an oil way assembly and a control assembly, the oil way assembly comprises a first oil way, a second oil way and a main control valve, the first oil way and the second oil way are respectively connected with the hydraulic motor, and the first oil way and the second oil way are respectively connected with the main control valve. The control assembly comprises a reversing valve, a first one-way valve and a second one-way valve, an oil inlet hole of the reversing valve is communicated with the second oil way, a first oil outlet hole of the reversing valve is communicated with the first oil way, a second oil outlet hole of the reversing valve is communicated with the second oil way, an oil return hole of the reversing valve is closed, and the first oil way is communicated with the oil tank and provided with the first one-way valve. The second oil way is communicated with the oil tank and provided with a second one-way valve. Hydraulic impact inside the hydraulic motor is reduced by arranging the reversing valve, oil is supplemented to a hydraulic motor loop by arranging the first one-way valve and the second one-way valve, the hydraulic motor is braked more accurately, and the service life of the hydraulic motor is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic motor technology, and more specifically, it relates to a hydraulic oil control circuit for shock protection of a hydraulic motor. Background Technology

[0002] Hydraulic motors are actuators that convert hydraulic energy into mechanical energy and are widely used in engineering machinery, ships, mining equipment, and other fields. The working principle of a hydraulic motor is to drive the output shaft to rotate through liquid pressure, outputting torque and speed. The operation of a hydraulic motor is achieved through an external control circuit that pumps hydraulic oil into the motor, causing it to rotate. However, when the hydraulic motor brakes, the directional valve switches to the neutral position, and the motor continues to rotate due to inertia, resulting in hydraulic shock and affecting its service life. Based on this, this invention proposes a new control circuit to solve the above problems. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a hydraulic oil control circuit for hydraulic motor shock protection. By setting a reversing valve to reduce hydraulic shock inside the hydraulic motor, and by setting a first check valve and a second check valve to replenish oil to the hydraulic motor circuit, more precise braking of the hydraulic motor and protection of the hydraulic motor's lifespan are achieved.

[0004] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0005] A hydraulic oil control circuit for shock protection of a hydraulic motor includes a hydraulic motor, an oil circuit assembly, and a control assembly. The oil circuit assembly includes a first oil circuit, a second oil circuit, and a main control valve. The first and second oil circuits are respectively connected to the hydraulic motor and to the main control valve, which is connected to an external oil pump. The control assembly includes a directional valve, a first check valve, and a second check valve. The inlet of the directional valve is connected to the first oil circuit via a third oil circuit, the first outlet of the directional valve is connected to the first oil circuit via a fourth oil circuit, the second outlet of the directional valve is connected to the second oil circuit via a fifth oil circuit, and the return port of the directional valve is closed. The first oil circuit is connected to an oil tank via a sixth oil circuit, and a first check valve is installed on the sixth oil circuit. The second oil circuit is connected to the oil tank via a seventh oil circuit, and a second check valve is installed on the seventh oil circuit.

[0006] In one embodiment, the hydraulic oil control circuit for shock protection of the hydraulic motor further includes an overflow component, which includes a first overflow valve. An eighth oil circuit is provided between the first oil circuit and the second oil circuit. The first overflow valve is located on the eighth oil circuit. When the first overflow valve is working, hydraulic oil flows from the second oil circuit to the first oil circuit.

[0007] In one embodiment, the overflow assembly further includes a second overflow valve, and a ninth oil passage is provided between the first oil passage and the second oil passage. The second overflow valve is located on the ninth oil passage. When the second overflow valve is working, hydraulic oil flows from the first oil passage to the second oil passage.

[0008] In one embodiment, the reversing valve is a two-position three-way solenoid valve.

[0009] In one embodiment, the main control valve is a three-position four-way solenoid valve.

[0010] In one embodiment, the first oil circuit is provided with a first throttle valve, and the first oil circuit is also provided with a first bypass oil circuit. The first bypass oil circuit is provided with a first bypass check valve, and the first throttle valve is located between two connection points of the first bypass oil circuit and the first oil circuit.

[0011] In one embodiment, the second oil circuit is provided with a second throttle valve, and the second oil circuit is also provided with a second bypass oil circuit. A second bypass check valve is provided on the second bypass oil circuit, and the second throttle valve is located between the two connection points of the second bypass oil circuit and the second oil circuit.

[0012] In one embodiment, the number of hydraulic motors is greater than or equal to one.

[0013] In summary, this utility model has the following beneficial effects:

[0014] This invention reduces hydraulic shock inside the hydraulic motor by setting a reversing valve, and replenishes oil to the hydraulic motor circuit by setting a first check valve and a second check valve, thereby achieving more precise braking of the hydraulic motor and protecting its lifespan. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the present invention.

[0016] In the diagram: 1. First oil circuit, 2. Second oil circuit, 3. Third oil circuit, 4. Fourth oil circuit, 5. Fifth oil circuit, 6. Sixth oil circuit, 7. Seventh oil circuit, 8. Eighth oil circuit, 9. Ninth oil circuit, 10. Main control valve, 11. Directional control valve, 12. First check valve, 13. Second check valve, 14. First relief valve, 15. Second relief valve, 16. First bypass oil circuit, 17. First throttle valve, 18. Second bypass oil circuit, 19. Second throttle valve, 20. Hydraulic motor.

[0017] In the reversing valve: P represents the oil inlet, A represents the first oil outlet, B represents the second oil outlet, and T represents the oil return. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] It is worth noting that the directional terms such as "up" and "down" used in this article are all relative to the perspective of the attached figures and are only for the purpose of description. They should not be interpreted as limitations on the technical solutions.

[0020] like Figure 1 As shown, this utility model proposes a hydraulic oil control circuit for shock protection of a hydraulic motor, including a hydraulic motor 20, an oil circuit assembly, and a control assembly. The oil circuit assembly includes a first oil circuit 1, a second oil circuit 2, and a main control valve 10. The first oil circuit 1 and the second oil circuit 2 are respectively connected to the hydraulic motor 20, and the first oil circuit 1 and the second oil circuit 2 are respectively connected to the main control valve 10. The main control valve 10 is connected to an external oil pump. The control assembly includes a directional valve 11, a first check valve 12, and a second check valve 13. 3. The oil inlet of the reversing valve 11 is connected to the first oil passage 1 through the third oil passage 3. The first oil outlet of the reversing valve 11 is connected to the first oil passage 1 through the fourth oil passage 4. The second oil outlet of the reversing valve 11 is connected to the second oil passage 2 through the fifth oil passage 5. The oil return port of the reversing valve 11 is closed. The first oil passage 1 is connected to the oil tank through the sixth oil passage 6. A first check valve 12 is installed on the sixth oil passage 6. The second oil passage 2 is connected to the oil tank through the seventh oil passage 7. A second check valve 13 is installed on the seventh oil passage 7.

[0021] In this invention, the main control valve 10 is preferably a three-position four-way solenoid valve, and the directional valve 11 is preferably a two-position three-way solenoid valve.

[0022] Combination Figure 1 Explanation of the working process of this utility model:

[0023] The rotation of hydraulic motor 20 is defined as the state where oil enters the first oil passage 1 and causes hydraulic motor 20 to rotate. Figure 1 As shown, the case where the hydraulic motor 20 rotates due to the oil entering through the second oil passage 2 is considered as the reverse rotation of the hydraulic motor 20.

[0024] When the hydraulic motor 20 rotates forward, the reversing valve 11 controls the oil inlet to connect with the first oil outlet and the oil return to connect with the second oil outlet. That is, the third oil circuit 3 is connected with the fourth oil circuit 4, and the fifth oil circuit 5 is closed. At this time, oil enters the first oil circuit 1, and the hydraulic oil can flow into the hydraulic motor 20 along the first oil circuit 1. The third oil circuit 3 is connected with the fourth oil circuit 4, forming a bypass oil circuit of the first oil circuit 1, which does not affect the normal operation of the hydraulic motor 20. The oil in the hydraulic motor 20 returns through the second oil circuit 2.

[0025] When the hydraulic motor 20 reverses, the reversing valve 11 controls the oil inlet to connect with the first oil outlet and the oil return to connect with the second oil outlet. That is, the third oil passage 3 is connected with the fourth oil passage 4 and the fifth oil passage 5 is closed. At this time, oil enters the second oil passage 2 and hydraulic oil flows into the hydraulic motor 20 along the second oil passage 2. The oil in the hydraulic motor 20 returns through the first oil passage 1 or through the first oil passage 1 and the reversing valve 11.

[0026] When the forward-rotating hydraulic motor 20 brakes, the main control valve 10 closes, the first oil circuit 1 stops receiving oil, and the second oil circuit 2 stops returning oil. The hydraulic motor 20 continues to rotate due to inertia. At this time, the reversing valve 11 controls the oil inlet to connect with the second oil outlet and the oil return to connect with the first oil outlet. That is, the third oil circuit 3 connects with the fifth oil circuit 5, and the fourth oil circuit 4 is closed. The hydraulic oil in the second oil circuit 2 that was originally compressed by the hydraulic motor 20 due to inertia can return to the first oil circuit 1 along the fifth oil circuit 5 and the third oil circuit 3. This part of the hydraulic oil is no longer compressed, thus reducing the impact caused by braking.

[0027] Similarly, when the reverse hydraulic motor 20 brakes, the main control valve 10 closes, and the reversing valve 11 controls the oil inlet to connect with the second oil outlet and the oil return to connect with the first oil outlet. That is, the third oil circuit 3 is connected with the fifth oil circuit 5, and the fourth oil circuit 4 is closed. The hydraulic oil in the first oil circuit 1 that was originally compressed by the hydraulic motor 20 due to inertia can return to the second oil circuit 2 along the third oil circuit 3 and the fifth oil circuit 5. This part of the hydraulic oil is no longer compressed, thus reducing the impact caused by braking.

[0028] The first check valve 12 on the sixth oil circuit 6 allows hydraulic oil in the tank to flow into the first oil circuit 1, while restricting the flow of hydraulic oil in the first oil circuit 1 into the tank through the seventh oil circuit 7. Similarly, the second check valve 13 on the sixth oil circuit 6 allows hydraulic oil in the tank to flow into the second oil circuit 2, while restricting the flow of hydraulic oil in the second oil circuit 2 into the tank through the seventh oil circuit 7. During braking of the hydraulic motor 20, leakage is unavoidable. After the reversing valve 11 is activated, if the suction chamber of the first oil circuit 1 and / or the second oil circuit 2 becomes empty due to leakage, hydraulic oil enters the first oil circuit 1 and / or the second oil circuit 2 through the sixth oil circuit 6 and / or the seventh oil circuit 7 to replenish the oil supply. This effectively reduces the impact pressure generated inside the hydraulic motor 20 during braking, thus protecting the hydraulic motor 20.

[0029] Furthermore, the hydraulic oil control circuit for shock protection of the hydraulic motor also includes an overflow assembly, which includes a first overflow valve 14, such as... Figure 1 As shown, an eighth oil passage 8 is provided between the first oil passage 1 and the second oil passage 2. A first relief valve 14 is installed on the eighth oil passage 8. When the first relief valve 14 is working, hydraulic oil flows from the second oil passage 2 to the first oil passage 1. It is easy to understand that under normal circumstances, the first relief valve 14 is in a normally closed state. When the forward-rotating hydraulic motor 20 generates a large impact pressure during braking, the hydraulic oil in the second oil passage 2 can also flow back to the first oil passage 1 through the first relief valve 14, thus limiting the impact pressure during braking.

[0030] Furthermore, the overflow assembly also includes a second overflow valve 15, such as Figure 1As shown, a ninth oil passage 9 is provided between the first oil passage 1 and the second oil passage 2. A second relief valve 15 is installed on the ninth oil passage 9. When the second relief valve 15 is working, hydraulic oil flows from the first oil passage 1 to the second oil passage 2. It is easy to understand that under normal circumstances, the second relief valve 15 is in a normally closed state. When the reverse-rotating hydraulic motor 20 generates a large impact pressure during braking, the hydraulic oil in the first oil passage 1 can also flow back to the second oil passage 2 through the second relief valve 15.

[0031] Furthermore, the first oil circuit 1 is provided with a first throttle valve 17, and the first oil circuit 1 is also provided with a first bypass oil circuit 16. A first bypass check valve is provided on the first bypass oil circuit 16, and the first throttle valve 17 is located between the two connection points of the first bypass oil circuit 16 and the first oil circuit 1.

[0032] Furthermore, the second oil circuit 2 is equipped with a second throttle valve 19, and the second oil circuit 2 is also equipped with a second bypass oil circuit 18. A second bypass check valve is installed on the second bypass oil circuit 18, and the second throttle valve 19 is located between the two connection points of the second bypass oil circuit 18 and the second oil circuit 2.

[0033] Furthermore, the number of hydraulic motors 20 is greater than or equal to one, meaning that this utility model can be connected to multiple hydraulic motors 20 simultaneously.

[0034] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A hydraulic shock absorbing hydraulic oil control circuit for a hydraulic motor, characterized by, The hydraulic system comprises a hydraulic motor (20), an oil path assembly and a control assembly, the oil path assembly comprises a first oil path (1), a second oil path (2) and a main control valve (10), the first oil path (1) and the second oil path (2) are connected with the hydraulic motor (20) respectively, and the first oil path (1) and the second oil path (2) are connected with the main control valve (10) respectively, the control assembly comprises a reversing valve (11), a first check valve (12) and a second check valve (13), an oil inlet hole of the reversing valve (11) is communicated with the first oil path (1) through a third oil path (3), a first oil outlet hole of the reversing valve (11) is communicated with the first oil path (1) through a fourth oil path (4), a second oil outlet hole of the reversing valve (11) is communicated with the second oil path (2) through a fifth oil path (5), an oil return hole of the reversing valve (11) is closed, the first oil path (1) is communicated with an oil tank through a sixth oil path (6), the first check valve (12) is arranged on the sixth oil path (6), the second oil path (2) is communicated with the oil tank through a seventh oil path (7), and the second check valve (13) is arranged on the seventh oil path (7).

2. The hydraulic shock absorbing hydraulic oil control circuit of claim 1, wherein, The hydraulic system further comprises an overflow assembly, the overflow assembly comprises a first overflow valve (14), an eighth oil path (8) is arranged between the first oil path (1) and the second oil path (2), and the first overflow valve (14) is arranged on the eighth oil path (8), when the first overflow valve (14) works, hydraulic oil flows from the second oil path (2) to the first oil path (1).

3. The hydraulic shock absorbing hydraulic oil control circuit of claim 2, wherein, The overflow assembly further comprises a second overflow valve (15), a ninth oil path (9) is arranged between the first oil path (1) and the second oil path (2), and the second overflow valve (15) is arranged on the ninth oil path (9), when the second overflow valve (15) works, hydraulic oil flows from the first oil path (1) to the second oil path (2).

4. The hydraulic shock absorbing hydraulic oil control circuit of any one of claims 1-3, wherein, The reversing valve (11) is a two-position three-way electromagnetic valve.

5. The hydraulic shock absorbing hydraulic oil control circuit of any one of claims 1-3, wherein, The main control valve (10) is a three-position four-way electromagnetic valve.

6. The hydraulic shock proof hydraulic oil control circuit of claim 1, wherein, The first oil path (1) is provided with a first throttle valve (17), and the first oil path (1) is further provided with a first bypass oil path (16), a first bypass check valve is arranged on the first bypass oil path (16), and the first throttle valve (17) is located between two connection points of the first bypass oil path (16) and the first oil path (1).

7. The hydraulic shock mitigating hydraulic oil control circuit of claim 6, wherein, The second oil path (2) is provided with a second throttle valve (19), and the second oil path (2) is further provided with a second bypass oil path (18), a second bypass check valve is arranged on the second bypass oil path (18), and the second throttle valve (19) is located between two connection points of the second bypass oil path (18) and the second oil path (2).

8. The hydraulic shock proof hydraulic oil control circuit of claim 1, wherein, The number of the hydraulic motor (20) is greater than or equal to one.

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