An equivalent acceleration loading device

Abstract

The present invention discloses an equivalent acceleration loading device, comprising a bracket, a traction rope, a force measuring component, a spring, a transmission mechanism and a traction mechanism; an upper cover plate is arranged above the bracket, a base is arranged below the bracket, the traction mechanism is fixedly mounted on the upper cover plate, and the transmission mechanism is fixedly mounted on the base; a test sample is arranged on the bracket upper cover plate through a suspension device, and the test sample is connected to one end of the traction rope below; the other end of the traction rope is connected in series with the spring and the force measuring component after passing around the transmission mechanism and finally connected to the traction mechanism; the connection point between the traction rope and the test sample is located at the center of gravity of the test sample. The beneficial effects of the present invention are as follows: the size of the bracket can be designed according to the size of the test sample, and acceleration tests can be performed on test samples of any volume, and the bracket is unobstructed on all four sides, which facilitates the connection between the supply channel of the test sample and the test line, and the bracket base can be designed according to other test equipment to be coordinated, so as to perform comprehensive testing.

Description

Technical Field

[0001] The present invention relates to the technical field of acceleration overload testing, in particular to an acceleration loading device. Background Art

[0002] For equipment installed on aircraft, helicopters, manned spacecraft, aircraft external attachments and ground-launched missiles, a large number of testing processes are required during the research and development process. One of the more complex ones is the need to provide some stable inertial loads to evaluate their performance under different acceleration conditions to ensure safety and reliability.

[0003] Currently, there are two main types of acceleration testing machines: centrifugal and rocket-skid. Centrifugal accelerometers occupy a large area and can only perform acceleration tests on small test specimens. Furthermore, connecting the air and power supply channels to the test specimens and test lines is difficult. Rocket-skid accelerometers require several kilometers of guide rails for testing, making their construction and operation extremely expensive. Furthermore, existing testing machines can only be used as standalone testing equipment and are difficult to integrate with other testing equipment for comprehensive testing. Summary of the Invention

[0004] To solve the above problems, the present invention aims to provide an equivalent acceleration loading device that has a simple structure, low cost, and can be combined with other test equipment to conduct comprehensive tests and evaluate performance.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] An equivalent acceleration loading device comprises a bracket, a traction rope, a force measuring component, a spring, a transmission mechanism and a traction mechanism; an upper cover is provided above the bracket, a base is provided below the bracket, the traction mechanism is fixedly mounted on the upper cover, and the transmission mechanism is fixedly mounted on the base; a test sample is arranged on the bracket upper cover via a suspension device, and the test sample is connected to one end of the traction rope below; the other end of the traction rope passes around the transmission mechanism, is connected in series with the spring and the force measuring component, and is finally connected to the traction mechanism; the connection point between the traction rope and the test sample is located at the center of gravity of the test sample.

[0007] The suspension device is a rope.

[0008] The suspension device is a piston cylinder, the cylinder body of the piston cylinder is fixed on the upper cover plate, and the piston end of the piston cylinder is fixedly connected to the test sample.

[0009] The transmission mechanism consists of four fixed pulleys, which are symmetrically fixed on the bracket base with the vertical projection center of the test sample as the origin.

[0010] The traction mechanism includes a motor, a reducer, and a drum; one end of the reducer is connected to the output shaft of the motor, and the other end is connected to the drum; the traction rope passing through the fixed pulley is fixed on one side of the drum, and the surface of the drum is provided with an anti-slip texture to enhance the friction of the traction rope.

[0011] The material of the traction rope is non-elastic material.

[0012] The spring is a coil spring.

[0013] There is a corresponding relationship between the traction mechanism and the fixed pulley, and the line connecting the installation position of the traction mechanism and the installation center of the fixed pulley is perpendicular to the horizontal plane, so that the spring can be adjusted vertically up and down under the action of the traction mechanism.

[0014] The motor and reducer are connected to the upper cover of the bracket by bolts to form a stable support.

[0015] The traction rope is made of nylon fiber, carbon fiber or cotton thread.

[0016] The present invention has the following advantages: the bracket size can be customized according to the size of the test sample, enabling acceleration testing on test samples of any volume. Furthermore, the bracket is unobstructed on all four sides, facilitating easy access to the test sample supply channel and connection to the test line. The bracket base can also be designed based on other test equipment to facilitate comprehensive testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a structural diagram of the traction mechanism. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings. Figure 1 、 Figure 2 As shown, the present invention includes a bracket 1, a traction rope 7, a force measuring component 4, a spring 5, a transmission mechanism 6 and a traction mechanism 3; an upper cover plate 101 is provided above the bracket, and a base 102 is provided below the bracket, the traction mechanism 3 is fixedly mounted on the upper cover plate 101, and the transmission mechanism 6 is fixedly mounted on the base 102; the test sample 2 is arranged on the bracket upper cover plate 101 through a suspension device 8 above, and the test sample is connected to one end of the traction rope 7 below; the other end of the traction rope 7 passes around the transmission mechanism 6, is connected in series with the force measuring component 4 and the spring 5, and is finally connected to the traction mechanism 3; the connection point between the traction rope 7 and the test sample 2 is located at the center of gravity of the test sample 2.

[0020] The suspension device 8 is a rope. Another suspension device is a piston cylinder, the cylinder body of the piston cylinder is fixed on the upper cover plate, and the piston end of the piston cylinder is fixedly connected to the test sample.

[0021] Preferably, the transmission mechanism 6 is composed of four fixed pulleys, which are symmetrically fixedly mounted on the bracket base 102 with the vertical projection center of the test sample as the origin.

[0022] The traction mechanism 3 includes a motor 31, a reducer 32, and a drum 33; one end of the reducer 32 is connected to the output shaft of the motor 31, and the other end is connected to the drum 33; the traction rope 7 passing through the fixed pulley is fixed on one side of the drum, and the surface of the drum is provided with an anti-slip texture to enhance the friction of the traction rope.

[0023] The traction mechanism is used to pull the traction rope, causing the test sample to move under the tension of the traction rope. The force measuring component and the spring are connected in series in the middle of the traction rope to measure the traction force of the traction rope.

[0024] In order to ensure better technical effects, the material of the traction rope is non-elastic material.

[0025] The spring 5 is a coil spring.

[0026] There is a corresponding relationship between the traction mechanism 3 and the fixed pulley. The line connecting the installation position of the traction mechanism and the installation center of the fixed pulley is perpendicular to the horizontal plane, so that the spring can be adjusted vertically up and down under the action of the traction mechanism.

[0027] The motor 31 and the reducer 32 are connected to the upper cover of the bracket by bolts to form a stable support.

[0028] The traction rope 7 is made of nylon fiber, carbon fiber or cotton thread.

[0029] Each motor of the present invention is controlled by its own controller; the controller and the force measuring component 4 are electrically connected to the control center.

[0030] Principle of the present invention:

[0031] Assume that the mass of the test sample is m, the angle between the traction rope connecting the test sample and the fixed pulley and the center of gravity of the test sample is a, the traction force displayed by the force measuring component is F, and the sum of the traction forces is Fs, Fs=4×F. The sum of the traction forces and the gravitational acceleration experienced by the test sample are related by the following formula:

[0032] g d =g+Fs×cosa / m;

[0033] g d is the equivalent acceleration due to gravity, in m / s 2 .

[0034] The spring's elastic coefficient K, spring stretch length L, and the traction force are related to the spring stretch length as follows: L = F / K (unit: m). During use, ensure that L does not exceed the spring's stretch limit.

[0035] During initial installation, ensure that the force-measuring components display a value of 0. Then, power the equipment on. The four motors simultaneously adjust their speeds according to external control commands, generating torque. After matching the speeds through a reducer, the reducer's output shaft connects to the drum, generating the output speed and causing the drum to rotate. The output speeds of each motor are consistent, ensuring consistent traction. As the drum rotates, the traction rope winds or unwinds around it, increasing or decreasing the tension on the test specimen. The direction of rotation of the drum is controlled by the forward and reverse rotation of the motor.

[0036] By reading the traction force F displayed on the force measuring component and applying the above formula, the equivalent acceleration of the test specimen can be calculated. Adjusting the traction force can change the equivalent acceleration value. This device provides a stable inertial load to the test specimen, allowing evaluation of its performance under different acceleration conditions to ensure safety and reliability.

[0037] For example, when used in conjunction with a vibration table, after applying a certain traction force, the vibration table is turned on, and the test sample vibrates under the action of the vibration table. When the test sample moves upward, the forces that need to be overcome are gravity mg and traction force Fscosa. At this time, the acceleration of the test sample is g d =g+Fs×cosa / m. The test sample can be obtained in g d Dynamic performance under acceleration environment.

Claims

1. An equivalent acceleration loading device, characterized in that: The test sample vibrates under the action of the vibration table. The equivalent acceleration of the test sample is obtained by reading the traction force displayed on the force measuring component. Adjusting the traction force can change the equivalent acceleration value, which is used to provide a stable inertial load for the test sample to evaluate its performance under different acceleration conditions. It includes a bracket, a traction rope, a force measuring component, a spring, a transmission mechanism and a traction mechanism; an upper cover is arranged above the bracket, a base is arranged below the bracket, the traction mechanism is fixedly mounted on the upper cover, and the transmission mechanism is fixedly mounted on the base; the test sample is arranged on the upper cover of the bracket through a suspension device, and the test sample is connected to one end of the traction rope below; the other end of the traction rope passes around the transmission mechanism, is connected in series with the spring and the force measuring component, and is finally connected to the traction mechanism; the connection point between the traction rope and the test sample is located at the center of gravity of the test sample.

2. The equivalent acceleration loading device according to claim 1, characterized in that: The suspension device is a rope.

3. The equivalent acceleration loading device according to claim 1, characterized in that: The suspension device is a piston cylinder, the cylinder body of the piston cylinder is fixed on the upper cover plate, and the piston end of the piston cylinder is fixedly connected to the test sample.

4. The equivalent acceleration loading device according to claim 1, characterized in that: The transmission mechanism consists of four fixed pulleys, which are symmetrically fixed on the bracket base with the vertical projection center of the test sample as the origin.

5. The equivalent acceleration loading device according to claim 1, characterized in that: The traction mechanism includes a motor, a reducer, and a drum; one end of the reducer is connected to the output shaft of the motor, and the other end is connected to the drum; The traction rope passing through the fixed pulley is fixed to one side of the drum, and the surface of the drum is provided with an anti-slip texture to enhance the friction of the traction rope.

6. The equivalent acceleration loading device according to claim 1, characterized in that: The material of the traction rope is non-elastic material.

7. The equivalent acceleration loading device according to claim 1, characterized in that: The spring is a coil spring.

8. The equivalent acceleration loading device according to claim 1, characterized in that: There is a corresponding relationship between the traction mechanism and the fixed pulley, and the line connecting the installation position of the traction mechanism and the installation center of the fixed pulley is perpendicular to the horizontal plane, so that the spring can be adjusted vertically up and down under the action of the traction mechanism.

9. The equivalent acceleration loading device according to claim 5, characterized in that: The motor and reducer are connected to the upper cover of the bracket by bolts to form a stable support.

10. The equivalent acceleration loading device according to claim 6, characterized in that: The traction rope is made of nylon fiber, carbon fiber or cotton thread.

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