8results about How to "Avoid violent impact" patented technology

This invention discloses a testing device and method for tensile deformation of fiber-reinforced cementitious materials, belonging to the field of engineering material testing technology. The testing device mainly includes three parts: a support frame, a lever system, and a specimen mounting system. The main steps of the testing method include: lifting the lever to unload; installing the specimen mounting system, slowly releasing the lever and finely adjusting the position of the tensile specimen to reduce eccentricity and achieve preloading; repeatedly lifting and unloading the lever, and finely adjusting the centering tensile clamp and the tensile specimen; installing the displacement sensor and zeroing it in the unloaded state; adjusting the weight of the lever according to the real-time display value of the force sensor to complete the suspension and precise loading of the tensile specimen. This method applies tensile force to the cement-based composite material through the lever mechanism and performs arbitrary crack propagation evaluation based on the micro-cracks in the cement-based material using digital image processing, which can quantitatively characterize the creep deformation and crack propagation process of cement-based composite materials under continuous tensile load.

The utility model discloses an electric shovel bucket opening and closing hydraulic damping device, a working device and an electric shovel. The electric shovel bucket opening and closing hydraulic damping device comprises a hydraulic cylinder, a first throttling valve, a switching valve, a one-way valve, a speed regulating valve and an energy accumulator. The hydraulic cylinder comprises a hydraulic cylinder barrel and a hydraulic cylinder piston rod; the throttle valve I is connected with a rodless cavity and a rod cavity of the hydraulic cylinder through a pipeline; the switching valve and the one-way valve are connected in series and then connected with the first throttling valve in parallel through a pipeline. The speed regulating valve is connected with a rodless cavity of the hydraulic cylinder and a control port of the switch valve through a pipeline; and the energy accumulator is connected with a rod cavity of the hydraulic cylinder through a pipeline. Opening and closing buffering of the electric shovel bucket door can be achieved through the hydraulic device, noise and impact are reduced, regular adjustment is not needed in the using process, the downtime is shortened, and the operation efficiency of an electric shovel is improved.

The utility model relates to the technical field of motorcycle anti-falling bars, in particular to a motorcycle anti-falling bar which comprises an installation frame, an installation mechanism is arranged on the surface of the installation frame, second movable sleeves are welded to the two sides of the installation frame, and the surfaces of the second movable sleeves are communicated with second installation bases. A second positioning bolt is arranged on the side, away from the second movable sleeve, of the second mounting base in a penetrating mode. A second positioning bolt is screwed out of a second bolt hole by rotating the second positioning bolt, then the mounting frame is rotated to drive a first movable sleeve, a fixed sleeve, a threaded sleeve, a threaded rod and a mounting plate to rotate, the angle of the mounting frame is adjusted, and when falling occurs, a buffering head is in contact with the ground firstly, and the buffering head is in contact with the ground; the buffering head pushes the buffering rod to move in the supporting cylinder, the buffering rod drives the spring to do telescopic motion for buffering, hard contact between the motorcycle and the ground is prevented, and violent collision between the motorcycle and the ground is prevented.

The utility model discloses an emergency unlocking device for an automobile door, and relates to the technical field of emergency unlocking of automobile doors. Comprising a door lock impact buckle piston cylinder barrel, a connecting rod is arranged on the upper wall face of the door lock impact buckle piston cylinder barrel, an emergency unlocking handle is hinged to the connecting rod, an open groove is formed in the emergency unlocking handle, and a locking piston cylinder barrel is arranged on the upper wall face of the door lock impact buckle piston cylinder barrel. A locking piston bolt column is inserted into the upper wall face of the locking piston cylinder barrel in a sliding mode, and the upper end of the locking piston bolt column is installed in the open groove in a sliding mode. The emergency vehicle door unlocking structure is stable in performance, safe and efficient in design, high-strength stainless steel double springs and double pistons are adopted for clamping and pressing, the situation that a vehicle door is opened by mistake due to violent collision, collision, rolling and bumping of a vehicle is effectively prevented, and the emergency vehicle door unlocking structure adapts to an extreme environment and resists limiting temperature; the emergency unlocking handle adopts a lever working principle, is simple to operate and is suitable for children and old people.

The present invention belongs to the field of building detection technology, and specifically relates to an intelligent detection device for engineering buildings based on drone mounting, including a mounting plate and a connecting frame, etc.; the connecting frame is installed on the mounting plate. The present invention realizes informing the personnel in the building that the detection operation is being carried out through the information on two signboards, and buffering through two spring rods to avoid violent collision when the two rotating rollers contact the wall, and then the water stains on the wall surface are absorbed by the water absorbent, and the wall skin that falls off the wall surface is scraped by the scraper, and the shoveled wall skin is adhered by the film, and then the cracks of the wall are detected by starting the operation of the infrared camera, thereby realizing the detection of the cracks of the wall, and improving the shooting quality of the infrared camera and the accuracy of crack recognition, and guiding the fallen wall skin through the top plate so that the fallen wall skin flows into the collection bag, thereby effectively improving the safety of the detection operation.

The present invention relates to the technical field of buffer oil cylinders, and discloses a buffer oil cylinder with high buffer performance and a working method thereof, wherein a one-way valve is movably connected to a buffer plunger through a spring, and a rod chamber and a rodless chamber are respectively provided with two connecting chambers, one connecting chamber is connected to the one-way valve through a buffer hole, and the other connecting chamber is connected to the buffer plunger through a drainage hole. When the piston is about to move to the end of the rod chamber of a cylinder body, the hydraulic oil pushes the one-way valve to compress the spring, and closes the connection between the rod chamber and the buffer plunger, so that a closed space is formed between the piston and the cylinder body. Due to the incompressible property of the liquid, the pressure changes sharply, thereby achieving a buffer effect, which not only helps to avoid high-pressure shocks, but also allows the hydraulic system to operate more stably and efficiently while ensuring the buffer effect.

The utility model discloses a damping buffer door closing structure which comprises an externally fixed door frame and a movable door leaf, the door leaf is connected on the door frame in a sliding or rolling mode, a damping assembly is arranged at the end of the door leaf, and a magnetic adsorption assembly is arranged between the door leaf and the door frame. The magnetic adsorption assembly comprises two magnets which are arranged between the door frame and the door leaf in parallel, and the opposite poles of the two magnets attract each other. When the door leaf of the sliding door is closed, the damping effect is achieved, violent impact is prevented, and the effect of automatically closing the door leaf can be achieved.