A high-response positive and negative constant force loading device

Abstract

The present invention discloses a high-response positive and negative constant force loading device, which relates to the field of aircraft loading test equipment, and aims to solve the problem that there is a lack of a device that can effectively and accurately test the performance of a servo mechanism. Among them: the installation crossbeam is fixedly installed on the platform, the middle part of the rocker arm is rotatably connected to the installation crossbeam, one ends of the first cylinder and the second cylinder are rotatably installed at one end of the installation crossbeam, the other ends of the first cylinder and the second cylinder are respectively rotatably installed at one end of the rocker arm, the first cylinder and the second cylinder are symmetrically installed along the installation crossbeam, both ends of the connecting rod are respectively rotatably connected to the rocker arm and the installation crossbeam, and the gas storage device is communicated with the first cylinder and the second cylinder through pipelines. The above system and method adopt a double-cylinder lever structure, adapt to the rapid commutation of the servo mechanism, can effectively and accurately test the performance of the servo mechanism, and have high practicability.

Description

Technical Field

[0001] The present invention relates to the field of aircraft loading test equipment, and in particular to a high-response positive and negative constant force loading device. Background Art

[0002] When testing a servo mechanism, it is necessary to apply positive and negative constant loads greater than 16,000 N, and it should be able to adapt to a response speed greater than 500 mm / s generated by the push rod of the servo mechanism under the working load. The following several methods have been used for testing the servo mechanism:

[0003] The torsion bar (plate) loading method cannot meet the requirements of constant force loading;

[0004] The method of using a throttle valve to generate back pressure to provide a constant load, in addition to being difficult to adjust the pressure, cannot achieve the switching of positive loads and cannot adapt to a response speed greater than 500 mm / s;

[0005] The friction force loading method is also difficult to provide a stable and reliable constant force and a high response speed because the dynamic friction coefficient and the static friction coefficient differ greatly, and the state of the friction surface changes with the environment and the working time.

[0006] It can be seen that there is no technical solution that can substantially solve the performance test of the servo mechanism so far. Summary of the Invention

[0007] The purpose of the present invention is to provide a high-response positive and negative constant force loading device to solve the problem that there is a lack of an effective and accurate device for testing the performance of a servo mechanism.

[0008] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0009] Provide a high-response positive and negative constant force loading device, including: a platform, a mounting crossbeam, a rocker arm, a first cylinder, a second cylinder, a connecting rod, and a gas storage device;

[0010] The mounting crossbeam is fixedly installed on the platform, the middle of the rocker arm is rotatably connected to the mounting crossbeam, one ends of the first cylinder and the second cylinder are rotatably installed at one end of the mounting crossbeam, the other ends of the first cylinder and the second cylinder are respectively rotatably installed at one end of the rocker arm, the first cylinder and the second cylinder are symmetrically installed along the mounting crossbeam, both ends of the connecting rod are respectively rotatably connected to the rocker arm and the mounting crossbeam, and the gas storage device is communicated with the first cylinder and the second cylinder through pipelines.

[0011] The above high-response positive and negative constant force loading device adopts a double-cylinder lever structure. The first cylinder and the second cylinder are symmetrically arranged along the installation crossbeam. The first cylinder, the second cylinder and the rocker arm enclose a triangular structure, making the overall structure more stable. Moreover, the first cylinder, the second cylinder and the rocker arm are connected in a rotational manner, which can transmit the received force, effectively adapting to the rapid commutation of the servo mechanism, simulating the actions of the nozzle, the moment of inertia, and the reaction force on the servo mechanism, realizing the performance test of the servo mechanism, solving the problem that there is a lack of a device that can effectively and accurately test the performance of the servo mechanism, and having high practicability.

[0012] Preferably, in the above technical solution, the first cylinder and the second cylinder both include threaded joints; the threaded joints are respectively threadedly connected to the cylinder push rods of the first cylinder and the second cylinder. One end of the threaded joint away from the cylinder push rod is provided with a waist-shaped groove. The first cylinder and the second cylinder are installed at both ends of the rocker arm through a pin shaft with a bushing, and the bushing is located in the waist-shaped groove.

[0013] Preferably, in the above technical solution, the installation crossbeam further includes installation supports; the installation supports are arranged at one end of the installation crossbeam and are symmetrically arranged along the installation crossbeam. One end of the first cylinder and the second cylinder is rotatably installed on the corresponding installation support.

[0014] Preferably, in the above technical solution, the first cylinder and the second cylinder both further include cylinder lugs; the cylinder lugs are respectively installed at one end of the first cylinder and the second cylinder away from the cylinder push rod, and the cylinder lugs are rotatably installed on the installation support through an installation shaft.

[0015] Preferably, in the above technical solution, the first cylinder and the second cylinder both further include a fine-tuning mechanism; the fine-tuning mechanism includes two fine-tuning bushings, and the two fine-tuning bushings are respectively threaded on both sides of the installation support, and the installation shaft is inserted into the two fine-tuning bushings.

[0016] Preferably, in the above technical solution, the gas storage system includes a gas storage tank, a gas pressure control device and a connecting pipe; the gas storage tank and the gas pressure control device are installed on the platform, the gas pressure control device is communicated with the gas storage tank, and the gas pressure control device is communicated with the first cylinder and the second cylinder through the connecting pipe.

[0017] Preferably, in the above technical solution, the first cylinder and the second cylinder both include an air inlet and an air outlet; the connecting pipe is communicated with the air inlet, and a stop valve is installed at the position of the air outlet.

[0018] Preferably, in the above technical solution, the gas storage tank further includes a safety overflow valve, a pressure gauge, and a pressure relief stop valve; the safety overflow valve, the pressure gauge, and the pressure relief stop valve are all installed on the gas storage tank and communicate with the gas storage tank.

[0019] Preferably, in the above technical solution, the rocker arm includes a swing rod and a fixing member; the fixing member is arranged at one end of the swing rod, and both ends of the connecting rod are rotatably connected to the fixing member and the mounting cross beam respectively.

[0020] Preferably, in the above technical solution, the platform includes a plurality of universal wheels; the plurality of universal wheels are installed at the bottom of the platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention, and constitute a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation to the present invention. In the drawings:

[0022] Figure 1 is a schematic diagram of a high-response positive and negative constant force loading device provided by an embodiment of the present invention;

[0023] Figure 2 is Figure 1 a schematic diagram of the high-response positive and negative constant force loading device after being installed on the platform;

[0024] Figure 3 is Figure 1 a partially enlarged view of the position of the threaded joint in ;

[0025] Figure 4 is Figure 1 a sectional view of the position of the fine adjustment mechanism in ;

[0026] Figure 5 is Figure 1 a schematic diagram of the position of the fine adjustment mechanism in ;

[0027] Figure 6 is Figure 1 a connection schematic diagram of the gas storage tank with the first cylinder and the second cylinder in.

[0028] Reference numerals:

[0029] 100 - Platform, 105 - Castor, 210 - Mounting crossbeam, 215 - Mounting support, 216 - Base lug, 220 - Rocker arm, 226 - Swing rod, 225 - Fixing part, 230 - First cylinder, 231 - Threaded joint, 2315 - Kidney-shaped slot, 232 - Air inlet, 233 - Air outlet, 234 - Cylinder lug, 235 - Fine adjustment mechanism, 2355 - Fine adjustment bushing, 2356 - Mounting shaft, 236 - Pin shaft, 237 - Bushing, 300 - Servo mechanism, 400 - Air storage tank, 401 - Air compressor, 402 - Filter, 403 - Pressure regulating valve, 404 - First pressure relief stop valve, 405 - Relief valve, 406 - Second pressure relief stop valve, 407 Pressure gauge. Detailed implementation mode

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] It should be noted that when an element is referred to as being fixed to or disposed on another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being connected to another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] In addition, the terms first and second are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with first and second may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of plural is two or more unless otherwise specifically defined. The meaning of several is one or more unless otherwise specifically defined.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "linkage" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Referring to Figure 1 , the high-response positive and negative constant force loading device provided by the present invention includes: a platform 100, a mounting crossbeam 210, a rocker arm 220, a first cylinder 230, a second cylinder 240, a connecting rod (not marked in the figure, which is replaced by a servo mechanism 300 during the actual experiment), and a gas storage device; the mounting crossbeam 210 is fixedly installed on the platform 100, the middle of the rocker arm 220 is rotatably connected to the mounting crossbeam 210, one ends of the first cylinder 230 and the second cylinder 240 are rotatably installed at one end of the mounting crossbeam 210, the other ends of the first cylinder 230 and the second cylinder 240 are respectively rotatably installed at one end of the rocker arm 220, the first cylinder 230 and the second cylinder 240 are symmetrically installed along the mounting crossbeam 210, both ends of the connecting rod are rotatably connected to the rocker arm 220 and the mounting crossbeam 210 respectively, and the gas storage device is communicated with the first cylinder 230 and the second cylinder 240 through a pipeline.

[0036] Furthermore, the device is also equipped with an air compressor 401, the working pressure of the air compressor 401 is 0.8 Mp, and the volume is 20 liters. The compressed air of the air compressor 401 enters the gas storage tank 300, the first cylinder 230, and the second cylinder 240 through a filter 402, a pressure regulating valve 403, and a pressure relief stop valve. Still further, the pressure relief stop valve includes a first pressure relief stop valve 404 and a second pressure relief stop valve 406. The first pressure relief stop valve 404 is arranged between the pressure regulating valve 403 and the gas storage tank 400, and the second pressure relief stop valve 406 is arranged between the gas storage tank 400 and a pressure gauge 407.

[0037] The specific implementation is as follows:

[0038] The working principle and operation description of the technical solution of the present invention: For details, see Figure 2 and Figure 3, a connecting rod with holes at both ends and a hole pitch of b1 is used to replace the servo mechanism 300 to connect the rocker arm 220 and the base lug 216. Among them, the base lug 216 is installed on the connecting cross beam and is used to install the connecting rod or the servo mechanism 300. Start the air compressor 401 to fill the first cylinder 230 and the second cylinder 240 of the air storage tank 300 with compressed air. The pistons of the first cylinder 230 and the second cylinder 240 are tightly attached to the bottom of the cylinders under the air pressure provided by the air storage tank 300. Adjust the screwing length of the threaded joint 231 on the first cylinder 230 and the second cylinder 240 with the cylinder push rod, and connect the rocker arm 220 and the threaded joint 231 with the bushing 237 with a fixed shaft. Adjust the fine adjustment mechanism 235 on the mounting support 215 corresponding to the first cylinder 230 and the second cylinder 240, so that the pin shaft 236 fits the arc of the waist-shaped groove 2315 of the threaded joint 231 on the first cylinder 230 and the second cylinder 240, and prevent the pistons of the first cylinder 230 and the second cylinder 240 from detaching from the bottom of the cylinders. Record the engraved line position of the fine adjustment mechanism 235 corresponding to the first cylinder 230 and the second cylinder 240. Remove the connecting rod and install the servo mechanism 300. Calculate and determine the air pressure of the first cylinder 230 and the second cylinder 240 through the feedback hydraulic pressure of the servo mechanism 300, and adjust the outlet pressure of the pressure regulating valve 403 to the determined pressure value. So far, the positive and negative constant force loading device is ready.

[0039] During the test of the servo mechanism 300, a positive command is sent to the servo mechanism 300. The push rod of the servo mechanism 300 extends, pushing the rocker arm 220 to rotate clockwise. The pin shaft 236 of the first cylinder 230 drives the bushing 237 to roll in the waist-shaped groove 2315 of the threaded joint 231 of the first cylinder 230, and the first cylinder 230 does not apply a load. The cylinder push rod of the second cylinder 240 is subjected to a tensile force, so the second cylinder 240 applies a load to the servo mechanism 300. Since the telescopic distance of the push rod of the servo mechanism 300 is short, the ratio of the telescopic distance of the cylinder push rod to the working stroke of the cylinder is small. Coupled with the connection between the air storage tank 300 and the cylinder, the air pressure change in the cylinder is very small, which can meet the allowable pressure change of the servo mechanism 300. When a negative command is applied to the servo mechanism 300, the push rod of the servo mechanism 300 retracts, pulling the rocker arm 220 to rotate counterclockwise. The first cylinder 230 applies a force, and the second cylinder 240 does not apply a force.

[0040] The above high-response positive and negative constant force loading device adopts a double-cylinder lever structure. The first cylinder and the second cylinder are symmetrically arranged along the installation cross beam. The first cylinder, the second cylinder and the rocker arm form a triangular structure, making the overall structure more stable. And the first cylinder, the second cylinder and the rocker arm are connected in a rotational connection form, which can transmit the force received, effectively adapting to the rapid commutation of the servo mechanism 300, simulating the actions of the nozzle, the moment of inertia, and the reaction force on the servo mechanism, realizing the performance test of the servo mechanism, solving the problem that there is a lack of a device that can effectively and accurately test the performance of the servo mechanism, and having high practicability.

[0041] As an implementable manner, both the first cylinder 230 and the second cylinder 240 include threaded joints 231; the threaded joints 231 are respectively threadedly connected to the cylinder push rods of the first cylinder 230 and the second cylinder 240. One end of the threaded joint 231 away from the cylinder push rod is provided with a waist-shaped groove 2315. The first cylinder 230 and the second cylinder 240 are installed at both ends of the rocker arm 220 through a pin shaft 236 with a bushing 237, and the bushing 237 is located in the waist-shaped groove.

[0042] The bushing 237 is sleeved on the pin shaft 236. The bushing 237 is embodied in the form of a roller in the waist-shaped groove 2315, and the roller can freely roll in the waist-shaped groove 2315, effectively reducing the friction force during the movement of the pin shaft 236 in the waist-shaped groove 2315 and improving the accuracy of the detection result.

[0043] As an implementable manner, the installation cross beam 210 further includes installation supports 215; the installation supports 215 are arranged at one end of the installation cross beam 210 and are symmetrically arranged along the installation cross beam 210. One end of the first cylinder 230 and the second cylinder 240 is rotatably installed on the corresponding installation support 215.

[0044] The setting of the installation support 215 facilitates the installation of the first cylinder 230 and the second cylinder 240. The installation supports 215 are symmetrically arranged along the installation cross beam 210, ensuring the symmetry of the first cylinder 230 and the second cylinder 240 on both sides of the installation cross beam 210 after installation, and further ensuring the accuracy of the detection result.

[0045] As an implementable manner, both the first cylinder 230 and the second cylinder 240 further include cylinder lugs 234; the cylinder lugs 234 are respectively installed at one end of the first cylinder 230 and the second cylinder 240 away from the cylinder push rod, and the cylinder lugs 234 are rotatably installed on the installation support 215 through an installation shaft 2356.

[0046] The setting of the cylinder lugs 234 facilitates the installation of the first cylinder 230 and the second cylinder 240. Adopting the form of rotational installation, the angles between the first cylinder 230 and the second cylinder 240 and the installation cross beam 210 can be adjusted.

[0047] As an implementable mode, both the first cylinder 230 and the second cylinder 240 further include a fine adjustment mechanism 235; the fine adjustment mechanism 235 includes two fine adjustment bushings 2355, the two fine adjustment bushings 2355 are respectively installed on both sides of the mounting holes on the mounting support 215, and the mounting shaft 2356 is inserted into the two fine adjustment bushings 2355.

[0048] By adjusting the fine adjustment bushings 2355 on the first cylinder 230 and the second cylinder 240, the pin shaft 236 can be made to fit the arc of the waist-shaped groove 2315 on the first cylinder 230 and the second cylinder 240, and the pistons of the first cylinder 230 and the second cylinder 240 are prevented from disengaging from the bottom of the cylinder. Further, the fine adjustment bushing 2355 is provided with an adjustment scale. Rotate the fine adjustment bushing 2355 to a suitable position and record the position of the engraved line indicated on the fine adjustment bushing 2355 to ensure that the state of the cylinder when the servo mechanism 300 is installed and connected to the connecting rod is the same.

[0049] As an implementable mode, the gas storage system includes a gas storage tank 300, a gas pressure control device, and a connecting gas pipe; the gas storage tank 300 and the gas pressure control device are installed on the platform 100, the gas pressure control device is communicated with the gas storage tank 300, and the gas pressure control device is communicated with the first cylinder 230 and the second cylinder 240 through the connecting gas pipe.

[0050] The gas storage tank 300 can better store the generated high-pressure gas. By adjusting the gas pressure control device, the high-pressure gas stored in the gas storage tank 300 can be transported to the first cylinder 230 and the second cylinder 240 through the connecting gas pipe. By adjusting the gas pressure control device, the gas pressure output from the gas storage tank 300 can be effectively adjusted.

[0051] As an implementable mode, both the first cylinder 230 and the second cylinder 240 include an air inlet 232 and an air outlet 233; the connecting gas pipe is communicated with the air inlet 232, and a cut-off valve is installed at the position of the air outlet 233.

[0052] The setting of the cut-off valve can effectively control the opening and / or closing of the air outlets 233 of the first cylinder 230 and the second cylinder 240.

[0053] As an implementable mode, the gas storage tank 300 further includes a safety overflow valve 405, a pressure gauge 407, and a pressure relief cut-off valve; the safety overflow valve 405, the pressure gauge 407, and the pressure relief cut-off valve are all installed on the gas storage tank 300 and communicated with the gas storage tank 300.

[0054] The settings of the safety overflow valve 405, the pressure gauge 407, the pressure relief cut-off valve, etc. effectively ensure the safety and operation stability of the gas storage tank 300.

[0055] As an implementable embodiment, the rocker arm 220 includes a swing rod 226 and a fixing member 225; the fixing member is disposed at one end of the swing rod, and two ends of the connecting rod are respectively rotatably connected to the fixing member 225 and the mounting cross beam 210.

[0056] The arrangement of the fixing member 225 facilitates the installation and fixation of the connecting rod and the servo mechanism 300.

[0057] As an implementable embodiment, the platform 100 includes a plurality of universal wheels; the plurality of universal wheels are mounted at the bottom of the platform 100.

[0058] The arrangement of the plurality of universal wheels facilitates the movement of the platform 100 and enables it to move to the corresponding position according to actual requirements.

[0059] In the description of the above embodiments, the specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

[0060] The above is only the specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A high-response positive and negative constant force loading device, characterized in that Comprising: a platform, a mounting crossbeam, a rocker arm, a first cylinder, a second cylinder, a connecting rod, and an air storage device; The mounting crossbeam is fixedly installed on the platform. The middle of the rocker arm is rotatably connected to the mounting crossbeam. One ends of the first cylinder and the second cylinder are rotatably installed at one end of the mounting crossbeam. The other ends of the first cylinder and the second cylinder are respectively rotatably installed at one end of the rocker arm. The first cylinder and the second cylinder are symmetrically installed along the mounting crossbeam. Two ends of the connecting rod are respectively rotatably connected to the rocker arm and the mounting crossbeam. The air storage device is communicated with the first cylinder and the second cylinder through a pipeline; Both the first cylinder and the second cylinder include threaded joints; The threaded joints are respectively threadedly connected to the cylinder push rods of the first cylinder and the second cylinder. One end of the threaded joint away from the cylinder push rod is provided with a kidney-shaped groove. The first cylinder and the second cylinder are installed at two ends of the rocker arm through a pin shaft with a bushing. The bushing is located in the kidney-shaped groove, and the bushing freely rolls in the kidney-shaped groove as a roller; The air storage device includes an air storage tank, a pneumatic control device, and an air connection pipe; The air storage tank and the pneumatic control device are installed on the platform. The pneumatic control device is communicated with the air storage tank. The pneumatic control device is communicated with the first cylinder and the second cylinder through the air connection pipe; An air compressor is also equipped. Compressed air of the air compressor enters the air storage tank, the first cylinder, and the second cylinder through a pressure regulating valve; Wherein, Remove the connecting rod, install a servo mechanism, calculate and determine the air pressures of the first cylinder and the second cylinder through the feedback hydraulic pressure of the servo mechanism, and adjust the outlet pressure of the pressure regulating valve to the determined pressure value; Send a positive command to the servo mechanism. The push rod of the servo mechanism extends, pushing the rocker arm to rotate clockwise. The pin shaft of the first cylinder drives the bushing to roll in the kidney-shaped groove of the threaded joint of the first cylinder. The first cylinder does not apply a load, while the cylinder push rod of the second cylinder is subjected to a tensile force, and the second cylinder applies a load to the servo mechanism; When a negative command is applied to the servo mechanism, the push rod of the servo mechanism retracts, pulling the rocker arm to rotate counterclockwise. The first cylinder applies a force, and the second cylinder does not apply a force.

2. The high-response positive and negative constant force loading device according to claim 1, characterized in that, The mounting crossbeam further includes a mounting support; The mounting support is arranged at one end of the mounting crossbeam and is symmetrically arranged along the mounting crossbeam. One ends of the first cylinder and the second cylinder are rotatably installed on the corresponding mounting supports.

3. The high-response positive and negative constant force loading device according to claim 2, characterized in that, Both the first cylinder and the second cylinder further include cylinder lugs; The cylinder lugs are respectively installed at one ends of the first cylinder and the second cylinder away from the cylinder push rod. The cylinder lugs are rotatably installed on the mounting support through a mounting shaft.

4. The high-response positive and negative constant force loading device according to claim 3, characterized in that Both the first cylinder and the second cylinder further include a fine adjustment mechanism; The fine adjustment mechanism includes two fine adjustment bushings. The two fine adjustment bushings are respectively threaded on both sides of the mounting support. The mounting shaft is inserted into the two fine adjustment bushings.

5. The high-response positive and negative constant force loading device according to claim 1, characterized in that, Both the first cylinder and the second cylinder include an air inlet and an air outlet; The connecting pipe is communicated with the air inlet, and a stop valve is installed at the position of the air outlet.

6. The high-response positive and negative constant force loading device according to claim 5, wherein, The air storage tank further includes a safety overflow valve, a pressure gauge and a pressure relief stop valve; The safety overflow valve, the pressure gauge and the pressure relief stop valve are all installed on the air storage tank and communicated with the air storage tank.

7. The high-response positive and negative constant force loading device according to claim 1, characterized in that The rocker arm includes a swing rod and a fixing member; The fixing member is arranged at one end of the swing rod, and the two ends of the connecting rod are respectively rotatably connected with the fixing member and the installation cross beam.

8. The high-response positive and negative constant force loading device according to claim 1, characterized in that The platform includes a plurality of universal wheels; A plurality of the universal wheels are installed at the bottom of the platform.

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