Hydraulic system of test bed

Abstract

The hydraulic system comprises an oil tank, an oil inlet pipeline, an execution pipeline and an oil return pipeline which are sequentially connected to form a loop, the oil inlet pipeline comprises an oil pump, a servo motor, a controller and a pressure control valve, the oil tank is connected with the oil pump, the oil pump is connected with the execution pipeline, and a flow sensor is further arranged between the oil pump and the execution pipeline. The servo motor is connected with the oil pump, the controller is in circuit connection with the flow sensor and the servo motor, then the controller can control the rotating speed of the servo motor in a closed-loop mode according to the flow obtained by the flow sensor so as to control the flow of a loop, and the pressure control valve is arranged between the output end of the oil pump and the oil tank. The pressure control valve is suitable for controlling the pressure of the loop, the flow and the pressure in the system are controlled through the servo motor and the pressure control valve respectively and do not influence each other, and the flow and the pressure in the system can be accurately controlled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic systems, in particular to a hydraulic system of a test bench. BACKGROUND

[0002] The aircraft reverse thrust component refers to a device for changing the direction of engine thrust, which is mainly used to reduce the speed of the aircraft and shorten the sliding distance of the aircraft after landing. Since the reverse thrust component is not limited by weather conditions such as rain and snow, has good braking effect and high safety factor, it is widely used in civil and military transport aircraft and turbojet and turbofan engines of civil passenger aircraft. The reverse thrust component test bench is suitable for detecting whether the assembly of the reverse thrust component is refrigerated, whether the opening and closing conversion process of the reverse thrust door is smooth and smooth without jamming, the opening and closing time of the reverse thrust door, the adjustment of the working position of various proximity switches, the working condition of the hydraulic system, the working state of various signal sensors, and the determination of the main data of the reverse thrust component to ensure that the reverse thrust component meets the installation requirements.

[0003] The test bench generally uses a hydraulic system to apply a load to the reverse thrust component for testing. In the existing hydraulic control technology, the pressure and flow of the hydraulic system are controlled by pressure valves and flow valves. The hydraulic system of the aircraft reverse thrust component test bench needs to accurately control the pressure and flow of the system at the same time. However, when using pressure valves and flow valves to control the pressure and flow of the hydraulic system at the same time, the change of the system flow will affect the size of the system pressure, resulting in the inability to accurately control the flow and pressure of the system. SUMMARY

[0004] One object of the present application is to provide a hydraulic system of a test bench to solve the problem of mutual influence of pressure control and flow control in the hydraulic system.

[0005] To achieve the above object, the technical scheme adopted by the present application is as follows: a hydraulic system of a test bench, an oil tank, an oil inlet pipeline, an execution pipeline and an oil return pipeline are connected in sequence to form a loop, the oil inlet pipeline comprises an oil pump, a servo motor, a controller and a pressure control valve, the oil tank is connected with the oil pump, the oil pump is connected with the execution pipeline, a flow sensor is further arranged between the oil pump and the execution pipeline, the servo motor is connected with the oil pump, the controller is connected with the flow sensor and the servo motor in an electrical circuit, and then the controller can control the rotation speed of the servo motor according to the flow obtained by the flow sensor to control the flow of the loop, the pressure control valve is arranged between the output end of the oil pump and the oil tank, and the pressure control valve is suitable for controlling the pressure of the loop.

[0006] As a preferred, the pressure control valve is implemented as an overflow valve, which is suitable for opening when the circuit pressure exceeds a preset value, so that the oil can flow back to the oil tank through the overflow valve, thereby keeping the circuit pressure within a preset range.

[0007] As another preferred, a first pressure sensor is further arranged between the oil pump and the execution pipeline, which is suitable for acquiring pressure information of the oil flowing into the execution pipeline.

[0008] Further preferably, the execution pipeline comprises a first valve body and an execution unit, an input end of the first valve body is connected with the oil pump, an output end of the first valve body is connected with the execution unit to form a main pipeline, and a first branch, a second branch and a third branch are arranged in parallel on the main pipeline.

[0009] Further, a first gate valve and a second gate valve are arranged in series on the main pipeline, the first gate valve is located between the execution unit and the first branch, the second gate valve is located between the first branch and the second branch, and a third gate valve is arranged on the second branch.

[0010] Further, a one-way valve is arranged on each of the first branch and the second branch.

[0011] Further, a second pressure sensor and a pressure gauge are arranged on the second branch, and the second pressure sensor and the pressure gauge are arranged in parallel on a side of the third gate valve away from the main pipeline.

[0012] Further, the first valve body is implemented as a two-position two-way electromagnetic valve, an oil inlet P of the first valve body is connected with the oil pump, an oil outlet A of the first valve body is connected with the execution unit to form the main pipeline, the first valve body is in a normally open state, and the first valve body is in an open state when not powered and in a closed state when powered.

[0013] Further, the oil return pipeline comprises a second valve body and a third valve body, an input end of the second valve body is connected with the main pipeline, an output end of the second valve body is connected with the third valve body, and the third valve body is connected with the oil tank.

[0014] Further, the second valve body is implemented as a two-position two-way electromagnetic valve, and the third valve body is implemented as an overflow valve, the second valve body is in a normally open state, the second valve body is in an open state when not powered and in a closed state when powered.

[0015] Compared with the prior art, the application has the following beneficial effects:

[0016] The application provides a hydraulic system, wherein flow information in a pipeline is acquired by a flow sensor as a feedback signal, a controller compares the feedback signal with a preset value and controls a servo motor to make a closed-loop control on rotation of an oil pump, so as to realize accurate control of flow in the pipeline, and pressure in the pipeline is controlled by a pressure control valve, and flow control and pressure control are independent and do not interfere with each other. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Fig. 1 is a schematic diagram of a hydraulic system of a test bench of the application.

[0018] In the figure: 100, oil tank; 200, oil inlet pipeline; 210, filter; 220, oil pump; 230, servo motor; 240, controller; 250, pressure control valve; 260, flow sensor; 270, first pressure sensor; 300, execution pipeline; 310, first valve body; 320, one-way valve; 330, second pressure sensor; 340, pressure gauge; 350, first gate valve; 360, second gate valve; 370, third gate valve; 400, oil return pipeline; 410, second valve body; 420, third valve body. DETAILED DESCRIPTION

[0019] Hereinafter, the application will be further described in conjunction with specific embodiments, and it should be noted that, without conflict, the embodiments described below or the technical features between the embodiments can be combined to form new embodiments.

[0020] In the description of the application, it should be noted that, for orientation words, such as terms "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the application.

[0021] It should be noted that the terms "first", "second", etc. in the specification and claims of the application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0022] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0023] This application provides a hydraulic system for a test bench, including an oil tank 100, an oil inlet pipe 200, an actuation pipe 300, and a return pipe 400 connected in sequence to form a circuit.

[0024] like Figure 1 As shown, the oil inlet pipeline 200 includes a filter 210, an oil pump 220, a servo motor 230, a controller 240, and a pressure control valve 250. The filter 210 is installed inside the oil tank 100 and connected to the input end of the oil pump 220. The output end of the oil pump 220 is connected to the execution pipeline 300. A flow sensor 260 is also connected in series between the oil pump 220 and the execution pipeline 300. The flow sensor 260 is electrically connected to the controller 240 and is adapted to acquire the flow signal at the output end of the oil pump 220 for transmission. The servo motor 230 is connected to the oil pump 220 via a drive connection to control the speed of the oil pump 220. The servo motor 230 is also electrically connected to the controller 240. Therefore, the controller 240 can perform closed-loop control of the servo motor 230's speed based on the flow signal acquired by the flow sensor 260. Since the flow rate output by the oil pump 220 is the product of its volume and its speed, and the volume of the oil pump 220 is fixed, changing the speed of the oil pump 220 will change its output flow rate. When the flow signal acquired by the flow sensor 260 is lower than the preset flow rate, the controller 240 controls the servo motor 230 to increase its speed to increase the flow rate output by the oil pump 220. When the flow signal acquired by the flow sensor 260 is higher than the preset flow rate, the controller 240 controls the servo motor 230 to decrease its speed to decrease the flow rate output by the oil pump 220. This ensures that the flow rate in the pipeline approaches the preset flow rate, achieving precise control of the system flow.

[0025] Further, the output end of the oil pump 220 is also connected with the oil tank 100, and a pressure control valve 250 is arranged in series between the output end of the oil pump 220 and the oil tank 100. The pressure control valve 250 can be implemented as a relief valve, which controls the pressure in the system based on the balance of hydraulic pressure and spring force. The pressure in the pipeline can be changed by changing the set pressure of the relief valve. When the pressure of the oil at the inlet of the relief valve is less than the set pressure of the relief valve, the valve core is pressed by the spring at the inlet of the oil, the inlet of the relief valve is in a closed state, the oil cannot enter the valve body, and also cannot flow from the outlet to the oil tank 100; when the pressure of the oil at the inlet of the relief valve is greater than the set pressure of the relief valve, the valve core is lifted by the oil, the relief valve is opened, the oil flows from the inlet to the outlet, and flows into the oil tank 100, so that the pressure in the pipeline tends to be close to the set pressure of the relief valve, and the accurate control of the system pressure is realized. Preferably, a first pressure sensor 270 is further arranged between the output end of the oil pump 220 and the execution pipeline 300, and the first pressure sensor 270 is adapted to obtain the pressure signal of the oil output by the oil pump 220. The controller 240 can adjust the set pressure of the pressure control valve 250 according to the pressure information of the oil to control the system pressure.

[0026] The flow control of the hydraulic system is realized by the controller 240 and the servo motor 230, and the pressure control of the hydraulic system is realized by the controller 240 and the pressure control valve 250. The two do not affect each other, and the flow and pressure can be accurately controlled.

[0027] Further, the execution pipeline 300 includes a first valve body 310 and an execution unit (not shown in the figure). The first valve body 310 is implemented as a two-position two-way electromagnetic valve. The first valve body 310 is a normally-off valve body, that is, the first valve body 310 is in an off state when not powered, and is in a conduction state when powered. The first valve body 310 has an oil inlet P and an oil outlet A. The oil inlet P of the first valve body 310 is connected with the output end of the oil pump 220. The oil outlet A of the first valve body 310 is connected with the execution unit and forms a main pipeline therebetween. The first branch, the second branch and the third branch are arranged in parallel on the main pipeline. The first branch and the third branch are each provided with a one-way conduction valve 320. When the oil flows to the first branch and the third branch, it is blocked by the one-way conduction valve 320. The second pressure sensor 330 and the pressure gauge 340 are arranged in parallel on the second branch. The second pressure sensor 330 and the pressure gauge 340 are adapted to obtain the pressure information of the oil in the main pipeline.

[0028] The main pipeline is further connected with a first gate valve 350 and a second gate valve 360 in series, the first gate valve 350 is arranged between the execution unit and the first branch pipeline, the second gate valve 360 is arranged between the first branch pipeline and the second branch pipeline, the second branch pipeline is provided with a third gate valve 370, a second pressure sensor 330 and a pressure gauge 340 are connected in parallel on the side of the third gate valve 370 away from the main pipeline, and the first gate valve 350, the second gate valve 360 and the third gate valve 370 can be operated to be disconnected or conduct the pipeline.

[0029] The oil return pipeline 400 comprises a second valve body 410 and a third valve body 420, the second valve body 410 is implemented as a two-position two-way electromagnetic valve, the second valve body 410 is a normally-off valve body, that is, the second valve body 410 is in the off state when not powered, and is in the on state when powered, the second valve body 410 has an oil inlet P and an oil outlet A, the oil inlet P of the second valve body 410 is connected with the main pipeline, the oil outlet A of the second valve body 410 is connected with the input end of the third valve body 420, and the output end of the third valve body 420 is connected with the oil tank 100, the third valve body 420 is implemented as an overflow valve, connecting the third valve body 420 in series on the oil return pipeline 400 can generate back pressure, so that the execution unit moves more stably, and the set pressure of the third valve body 420 is relatively low at this time.

[0030] The above describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited to the above-mentioned embodiments, the above-mentioned embodiments and descriptions in the specification are only the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A hydraulic system for a test stand, characterized by The oil tank, the oil inlet pipeline, the execution pipeline and the oil return pipeline are connected in sequence to form a circuit, the oil inlet pipeline comprises an oil pump, a servo motor, a controller and a pressure control valve, the oil tank is connected with the oil pump, the oil pump is connected with the execution pipeline, a flow sensor is further arranged between the oil pump and the execution pipeline, the servo motor is connected with the oil pump, the controller is connected with the flow sensor and the servo motor in an electric circuit, and then the controller can control the rotation speed of the servo motor according to the flow obtained by the flow sensor to control the flow of the circuit, and the pressure control valve is arranged between the output end of the oil pump and the oil tank, and the pressure control valve is suitable for controlling the pressure of the circuit.

2. The test stand hydraulic system of claim 1 wherein, The pressure control valve is implemented as an overflow valve, and the overflow valve is suitable for being opened when the circuit pressure exceeds a preset value, so that the oil can flow back to the oil tank through the overflow valve, thereby keeping the circuit pressure within a preset range.

3. The test stand hydraulic system of claim 2 wherein, A first pressure sensor is further arranged between the oil pump and the execution pipeline, and the first pressure sensor is suitable for obtaining pressure information of the oil flowing into the execution pipeline.

4. The test stand hydraulic system of claim 2 wherein, The execution pipeline comprises a first valve body and an execution unit, the input end of the first valve body is connected with the oil pump, the output end of the first valve body is connected with the execution unit to form a main pipeline, and the first branch, the second branch and the third branch are arranged in parallel on the main pipeline.

5. The test stand hydraulic system of claim 4 wherein, A first gate valve and a second gate valve are arranged in series on the main pipeline, the first gate valve is located between the execution unit and the first branch, the second gate valve is located between the first branch and the second branch, and a third gate valve is arranged on the second branch.

6. The test stand hydraulic system of claim 5 wherein, A one-way check valve is arranged on each of the first branch and the second branch.

7. The test stand hydraulic system of claim 5 wherein, A second pressure sensor and a pressure gauge are arranged on the second branch, and the second pressure sensor and the pressure gauge are arranged in parallel on the side of the third gate valve away from the main pipeline.

8. The test stand hydraulic system of claim 4 wherein, The first valve body is implemented as a two-position two-way electromagnetic valve, the oil inlet port P of the first valve body is connected with the oil pump, the oil outlet port A of the first valve body is connected with the execution unit to form the main pipeline, the first valve body is in a normally open state, and the first valve body is in an open state when not powered and in a closed state when powered.

9. The test stand hydraulic system of claim 4 wherein, The oil return pipeline comprises a second valve body and a third valve body, the input end of the second valve body is connected with the main pipeline, the output end of the second valve body is connected with the third valve body, and the third valve body is connected with the oil tank.

10. The test stand hydraulic system of claim 9, wherein, The second valve body is implemented as a two-position two-way electromagnetic valve, the third valve body is implemented as an overflow valve, the second valve body is in a normally open state, the second valve body is in an open state when not powered and in a closed state when powered.

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