Multi-safety proportional pressure servo torque tracking hydraulic control system

Abstract

The utility model discloses a multi-safety proportional pressure servo torque tracking hydraulic control system which comprises an oil tank, an oil pump and a servo motor, the oil tank is connected with an inlet of the oil pump, the servo motor drives the oil pump, an outlet of the oil pump is connected with an inlet of a high-pressure filter, an outlet of the high-pressure filter is divided into two paths, and the two paths are connected with the servo motor. A second path of an outlet of the high-pressure filter is connected with an inlet of a one-way valve, an outlet of the one-way valve is divided into two paths, a pressure sensor is connected to a pipeline of the one-way valve in parallel, a feedback signal line of the pressure sensor is connected to the connecting-in end of a servo driver, and the servo driver is connected with a servo motor; according to the multi-safety proportional pressure servo torque tracking hydraulic control system, the system pressure of the hydraulic system is controlled through the proportional pressure valve, torque control of the servo motor serves as follow pressure safety control, and the pressure of the hydraulic system is directly controlled to run within the normal range only after the system detects that hydraulic proportional pressure fails; and the phenomenon that the pressure is out of control is avoided.

Description

Technical Field

[0001] The utility model relates to the control field of super-large large-tonnage multi-cylinder synchronous CNC bending machines, in particular to a multi-safety proportional pressure servo torque tracking hydraulic control system. Background Art

[0002] At present, the thickness of bent plates is getting thicker and thicker. To complete the bending of ultra-thick plates, ultra-large-ton multi-cylinder bending machines are needed. At the same time, very stringent requirements are placed on the control of the hydraulic system of the cylinder. For example, for a normal 2,500-ton forming machine, the hydraulic pressure of the machine tool is 28MPa. At this time, the bending tonnage corresponding to 1MPa is 89.29 tons. The total tonnage of the bending forming machine is 18,000 tons, and the operating pressure of the hydraulic system is also 28MPa. In this way, the bending tonnage corresponding to 1MPa is 642.86 tons. Compared with a 2,500-ton forming machine, 1MPa is magnified 7.2 times, and it also brings great danger.

[0003] If the pressure of the hydraulic system cannot be well controlled during use, once the pressure of the hydraulic system is overloaded, it is quite terrible. For example, during the folding process, the pressure valve is stuck and does not move, and the system has high pressure. The high pressure of the system is a momentary process, and the operator has no reaction time at all. The system pressure reaches the highest or the highest pressure of the oil pump, causing inevitable losses. It can be imagined that if it exceeds 4MPa, the tonnage of the machine tool will exceed 2571.44 tons, that is to say, the 4MPa of this machine tool is equivalent to the working capacity of a 2500-ton molding machine, which is quite terrible during the accident. It must be ensured that the machine tool cannot be overpressured or overloaded. Therefore, how to ensure that there is no overpressure or overload under any circumstances is a technical bottleneck that the hydraulic system needs to solve urgently. In order to better complete the smooth progress of the project, we propose a multi-safety proportional pressure servo torque tracking hydraulic control system to solve the above problems. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a multi-safety proportional pressure servo torque tracking hydraulic control system, which can solve the technical problems of deficiencies and unsatisfactory safety in the prior art proposed in the above background technology.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: an oil tank, an oil pump and a servo motor,

[0006] The oil tank is connected to the oil pump inlet, the servo motor drives the oil pump, the oil pump outlet is connected to the inlet of the high-pressure filter, the high-pressure filter outlet is divided into two paths, the second path of the high-pressure filter outlet is connected to the inlet of the one-way valve, the one-way valve outlet is divided into two paths, a pressure sensor is connected in parallel on the one-way valve pipeline, the feedback signal line of the pressure sensor is connected to the access end of the servo driver, and the servo driver is connected to the servo motor to form a closed-loop control circuit for the torque control of the servo motor.

[0007] As a preferred technical solution of the utility model, the first outlet of the high-pressure filter is connected to the inlet of the electromagnetic overflow valve.

[0008] As a preferred technical solution of the utility model, the outlet of the electromagnetic overflow valve is connected to the oil tank.

[0009] As a preferred technical solution of the utility model, the first outlet of the one-way valve is connected to the inlet of the proportional relief valve.

[0010] As a preferred technical solution of the utility model, the outlet of the proportional relief valve is connected to the oil tank.

[0011] As a preferred technical solution of the utility model, the second outlet of the one-way valve is connected to a hydraulic control system.

[0012] Compared with the prior art, the utility model can achieve the following beneficial effects:

[0013] A proportional pressure valve is used to control the system pressure of the hydraulic system, and the torque control of the servo motor serves as a follow-up pressure safety control. Only when the system detects that the hydraulic proportional pressure has failed will the pressure of the hydraulic system be directly controlled to operate within a normal range to avoid pressure out-of-control. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the hydraulic principle structure of the multi-safety proportional pressure servo torque tracking hydraulic control system of the utility model;

[0015] Figure 2 This is a schematic diagram of the principle structure of the servo motor torque control of the multi-safety proportional pressure servo torque tracking hydraulic control system of the utility model;

[0016] Among them: 1. Oil tank; 2. Oil pump; 3. Servo motor; 4. High-pressure filter; 5. Solenoid overflow valve; 6. Check valve; 7. Proportional overflow valve; 8. Pressure sensor; 9. Servo driver. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0018] Example

[0019] Please refer to Figure 1-2 As shown, the utility model provides a technical solution: a multi-safety proportional pressure servo torque tracking hydraulic control system;

[0020] The oil tank 1 is connected to the inlet of the oil pump 2. The servo motor 3 drives the oil pump 2. The outlet of the oil pump 2 is connected to the inlet of the high-pressure filter 4. The outlet of the high-pressure filter 4 is divided into two paths. The second path of the outlet of the high-pressure filter 4 is connected to the inlet of the one-way valve 6. The outlet of the one-way valve 6 is divided into two paths. A pressure sensor 8 is connected in parallel to the pipeline of the one-way valve 6. The feedback signal line of the pressure sensor 8 is connected to the access end of the servo driver 9. The servo driver 9 is connected to the servo motor 3 to form a closed-loop control circuit for the torque control of the servo motor 3. The first path of the outlet of the high-pressure filter 4 is connected to the inlet of the electromagnetic overflow valve 5. The outlet of the electromagnetic overflow valve 5 is connected to the oil tank 1. The first path of the outlet of the one-way valve 6 is connected to the inlet of the proportional overflow valve 7. The outlet of the proportional overflow valve 7 is connected to the oil tank 1. The second path of the outlet of the one-way valve 6 is connected to the hydraulic control system;

[0021] A proportional pressure valve is used to control the system pressure of the hydraulic system, and the torque control of the servo motor 3 serves as a follow-up pressure safety control. Only when the system detects that the hydraulic proportional pressure fails, the pressure of the hydraulic system is directly controlled to operate within the normal range to avoid pressure out of control.

[0022] Specific working principle:

[0023] like Figure 1 and Figure 2As shown, when using the multi-safety proportional pressure servo torque tracking hydraulic control system, first rotate the pressure regulating handle of the electromagnetic overflow valve 5 clockwise to adjust it to the pressure required by the system, and then adjust the control signal of the proportional overflow valve 7 according to the detection pressure of the pressure sensor 8 until the pressure reaches the design requirement. According to the requirements of the servo driver 9, the pressure signal detected by the pressure sensor 8 is compared, and the driving current of the output servo motor 3 is controlled, thereby controlling the output torque of the servo motor 3 to control the oil pressure output by the hydraulic pump. During the operation of the system, the control of the proportional pressure valve is always followed. Once the pressure is detected to be abnormal, the torque output by the servo driver 9 is always controlled within the rated pressure range, thereby ensuring that the pressure is not over-pressured. The total tonnage of the bending forming machine is 18,000 tons, which ensures the safety of the machine tool and avoids the phenomenon of pressure out of control. The above completes a series of operations of the multi-safety proportional pressure servo torque tracking hydraulic control system. The content not described in detail in this description belongs to the prior art known to professional and technical personnel in this field.

[0024] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A multi-safety proportional pressure servo torque tracking hydraulic control system, comprising: an oil tank (1), an oil pump (2) and a servo motor (3), characterized in that: The oil tank (1) is connected to the inlet of the oil pump (2), the servo motor (3) drives the oil pump (2), the outlet of the oil pump (2) is connected to the inlet of the high-pressure filter (4), the outlet of the high-pressure filter (4) is divided into two paths, the second outlet of the high-pressure filter (4) is connected to the inlet of the one-way valve (6), the outlet of the one-way valve (6) is divided into two paths, a pressure sensor (8) is connected in parallel to the pipeline of the one-way valve (6), the feedback signal line of the pressure sensor (8) is connected to the access end of the servo driver (9), and the servo driver (9) is connected to the servo motor (3), forming a closed-loop control circuit for torque control of the servo motor (3).

2. The multi-safety proportional pressure servo torque tracking hydraulic control system according to claim 1, characterized in that: The first outlet of the high-pressure filter (4) is connected to the inlet of the electromagnetic overflow valve (5).

3. The multi-safety proportional pressure servo torque tracking hydraulic control system according to claim 2, characterized in that: The outlet of the electromagnetic overflow valve (5) is connected to the oil tank (1).

4. The multi-safety proportional pressure servo torque tracking hydraulic control system according to claim 1, characterized in that: The first outlet of the one-way valve (6) is connected to the inlet of the proportional relief valve (7).

5. The multi-safety proportional pressure servo torque tracking hydraulic control system according to claim 4, characterized in that: The outlet of the proportional relief valve (7) is connected to the oil tank (1).

6. The multi-safety proportional pressure servo torque tracking hydraulic control system according to claim 1, characterized in that: The second outlet of the one-way valve (6) is connected to a hydraulic control system.

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