4 results about "Free fall" patented technology

The invention discloses a device for acoustically detecting the height of a free falling body, and the device comprises a mobile control frame, the upper end of the mobile control frame is fixedly connected with an N-shaped lifting frame and a detection box, the detection box is located at the inner side of the N-shaped lifting frame, and the inner side of the N-shaped lifting frame is movably connected with a clamp. According to the device for acoustically detecting the height of the free falling body, a clamp is positioned on the inner side of an N-shaped lifting frame, a control motor drives an inner main rotating rod to drive a first bevel gear to rotate, and a second bevel gear on the outer wall of the first bevel gear can drive a vertical rotating rod and a control threaded rod to rotate; the lifting block controls the outer wall of the threaded rod to ascend and descend, meanwhile, the clamp is driven to ascend and descend on the inner side of the N-shaped lifting frame, the clamp can clamp an object to adjust different heights for falling detection, the initial falling height of the object can be accurately controlled, and personal errors caused by manual adjustment of the height of the object can be reduced.

The present application relates to a kind of multifunctional angle-changing slamming tower for ship bow free-fall slamming test, comprising top frame, left and right sides of the top frame are respectively provided with left arm frame and right arm frame, the inside of the left arm frame is provided with left rotating rotary frame, the inside of the right arm frame is provided with right rotating rotary frame, the middle part of the left arm frame is provided with linear guide rail angle drive mechanism for controlling the rotation of left rotating rotary frame, the left side surface of the left arm frame is provided with arc plate, and the arc plate is provided with rotating positioning hole for controlling the rotation of left rotating rotary frame;Electromagnet, movable module and variable heeling device are sequentially arranged below the middle part of the top frame, left and right sides of the movable module are provided with left support frame and right support frame, and the side surface of left rotating rotary frame, right rotating rotary frame, left support frame and right support frame is provided with linear guide rail.The present application can realize angle-changing and height adjustment of free-fall slamming test without changing tooling.

This invention discloses a constrained free-fall type fragile cover impact test system and method, belonging to the field of mechanical equipment performance testing. It includes: a support base to ensure the guide frame is perpendicular to the ground; an impact projectile suspended within the guide frame, with an adjustable height; the guide frame connected to the fragile cover by fasteners, simulating the constraint and guidance of the launch box / tube on the impact projectile, allowing the projectile to impact the fragile cover in free fall without jamming or eccentricity; and a sensor for measuring the impact force. This invention replaces the constraint and guidance of the launch box (tube) on the projectile with the constraint and guidance of the guide frame, utilizes the principle of free fall to represent the velocity of the projectile impacting the fragile cover, and measures the impact force that breaks the fragile cover using a sensor. The structure is simple, significantly reducing testing costs; it offers good guidance and centering accuracy, preventing projectile eccentricity and accurately simulating actual working conditions; the fragile cover is easy to assemble and disassemble, resulting in high testing efficiency.

This invention relates to the technical field of engineering experimental equipment and discloses a drop hammer impact testing machine for testing the impact resistance of drainage pipes. To solve the problem of local deceleration due to friction during the downward movement of the experimental hammer, an inner hammer and an experimental hammer are installed on a platform. Both the inner hammer and the experimental hammer descend synchronously under their own weight. During the downward movement of the platform, it moves directionally downward along the emergency stop guide rod and the one-way limiting guide rod. According to the law of free fall, if the resistance between the platform and the emergency stop guide rod and the one-way limiting guide rod causes the downward speed of the platform to decrease, the inner hammer will continue to descend under its own weight, and the movement restriction on the detection push rod will be released. The locking frame finally abuts against the limiting tooth row on the outer side of the one-way limiting guide rod through the locking push rod, thereby obstructing the downward movement of the platform and preventing it from impacting the drainage pipe again after deceleration. Ultimately, the downward speed of the experimental hammer and the inner hammer can be compared in real time.