13 results about "Single impact" patented technology

The invention discloses a method for predicting accumulation of multiple hail impact damages of a composite radome, and belongs to the technical field of composite mechanics and structural mechanics. The method comprises the following steps: firstly, establishing a hail model by adopting a smoothed particle hydrodynamics (SPH) method so as to accurately simulate the impact crushing behavior of the hail model; secondly, performing refined finite element modeling on the composite panel and the honeycomb sandwich structure of the radome, and introducing a progressive damage evolution model based on a Hashin criterion and fracture energy; the core of the method is that a stress field, a damage variable and a deformation field which are obtained by previous impact simulation are used as initial conditions to be imported into subsequent impact analysis, so that accurate transmission of a damage state under multiple impacts and real simulation of an accumulation process are realized. According to the method, the problems that the damage history cannot be reflected by traditional single-time impact analysis, the grid dependence is high and the like are effectively solved, the accuracy and efficiency of multi-time impact damage prediction can be remarkably improved, and a reliable tool is provided for achieving anti-impact design and life evaluation of the radome.

This utility model relates to an impact test frame for preventing secondary impacts, comprising a stand, a crossbar, and an anti-secondary impact component. A fixed frame is mounted on the stand, and a photovoltaic module is placed on the fixed frame. A test component and an adjustment component are located at the lower end of the crossbar. The test component includes a test line and a pendulum ball connected to the bottom end of the test line. The adjustment component is connected to the pendulum ball via a locking component to adjust the release height of the pendulum ball. The anti-secondary impact component includes an anti-collision cylinder and an anti-collision line located at the upper end of the crossbar. One end of the anti-collision line is connected to the piston rod end of the anti-collision cylinder, and the other end is connected to the pendulum ball. When the pendulum ball completes its first impact and begins to swing back, the anti-collision cylinder immediately contracts, actively pulling and braking the pendulum ball through the anti-collision line, preventing the possibility of secondary impacts on the photovoltaic module. This eliminates interference with the test results caused by multiple inertial impacts, improves the accuracy and reliability of the impact resistance test, and ensures that the test data truly reflects the performance of the photovoltaic module under a single impact.

The invention relates to the technical field of data processing, in particular to a large shield tunneling machine cutter optimization design method utilizing a finite element model. The technical problem that model selection and design of a cutter in a current composite stratum cannot meet terrain requirements is solved. The method comprises the following steps: determining formation resistance torque and formation resistance space change rate of each sector of a cutterhead, and determining vertical bearing capacity borne by a cutter in each sector; and determining the vertical intrusion rate of each position in each sector based on the cutting linear velocity at the position of the cutterhead and the formation resistance space change rate. Querying a single impact damage index from the impact damage characteristic database based on the vertical bearing capacity, the vertical invasion rate and the blade shape geometric parameters; the impact damage characteristic database is pre-established by utilizing finite element simulation; determining a dynamic damage index based on the single impact damage index; and optimizing the cutter at each position on the cutter head according to the dynamic damage index.

The invention discloses a stress detector for a glass product and a detection method, and belongs to the field of strength characteristic testing of the glass product, the stress detector comprises a supporting part and a falling ball detection part connected to the upper end of the supporting part; the stress accumulation preventing assembly comprises a first baffle, a second surrounding plate fixedly connected to the upper end of the first baffle, a ball falling opening formed in the first baffle, a sliding groove formed in the first baffle, a rebound blocking part located in the first baffle and an accumulated force releasing assembly connected to the interior of the first baffle and used for pushing the rebound blocking part to move; when a falling ball falls on glass, generates first impact and rebounds, the rebounded steel ball and the glass can be physically isolated through the first baffle, and therefore the final damage state of the glass is ensured. By intercepting the rebound ball, energy superposition caused by subsequent uncontrolled impact is thoroughly eliminated, and degradation of testing from single impact to fatigue impact is avoided; therefore, the test result completely meets the standard of single load, and the purity of experimental data is ensured.

The utility model discloses a magnetic attraction knocking vibration hammer of an activated carbon heating rotary kiln, and particularly relates to the technical field of knocking vibration hammers, the magnetic attraction knocking vibration hammer comprises a supporting plate, one side of the supporting plate is provided with a limiting groove, the middle of the limiting groove is fixedly connected with a first stabilizing rod, and the middle of the first stabilizing rod is sleeved with a sliding plate; a magnetic plate is embedded in the top of one end of the sliding plate, and an electric push rod is fixedly connected to the top of the supporting plate. When the magnetic suction plate is separated from the magnetic plate, the first impact rod drives the vibration hammer head at the bottom to fall down naturally for knocking, and the second impact rod drives the vibration hammer head at the bottom of the second impact rod to fall down again for knocking through inertia after single knocking, so that secondary knocking is realized; and the strength of the secondary knocking is obviously smaller than that of the first knocking, accumulated materials which do not completely fall off after the first knocking can be shaken off, the situation that the accumulated materials remain is avoided, and the cleaning effect is improved.

This invention discloses a collision-resistant energy dissipation structure and method for a triangular gate, comprising a collision-resistant plate and energy dissipation devices. Each energy dissipation device includes an energy dissipation cylinder and a fixed base. The fixed base is fixedly connected to the main beam, and a connecting rod is connected to the fixed base. The top of the energy dissipation cylinder has an opening for the connecting rod to pass through, and the energy dissipation cylinder is slidably fitted onto the connecting rod. The other end of the energy dissipation cylinder is fixedly connected to the collision-resistant plate, and multiple butterfly spring groups are provided inside the energy dissipation cylinder. This invention, by distributing multiple energy dissipation devices on the collision-resistant plate, ensures that the impact force is effectively dispersed through multi-point displacement and spring deformation during ship collisions, reducing the force on a single impact point, thereby reducing the risk of damage to the lock equipment. The butterfly springs in each energy dissipation device are combined differently according to the position, displacement, and stiffness requirements of the energy dissipation cylinder to ensure balanced reaction forces at each position and avoid local overload.

The invention relates to a sheet impact performance detection method, and belongs to the technical field of metallurgical test detection in the metallurgical industry. According to the technical scheme, the method comprises the following steps: respectively fixing two ends of a plurality of impact samples (5) together by using microsection clamps to form a sample, vertically placing the two ends of the sample and the microsection clamps into a square cold inlay mold (1) one by one, pouring blended cold inlay resin (4) into the mold (1), curing, taking out, processing a V-shaped notch or a U-shaped notch in the middle of the sample, and carrying out cold inlay molding. An impact testing machine is used for carrying out an overall impact test on the embedded samples, the total impact absorption energy is recorded, and the impact absorption energy of a single impact sample (5) is equal to the total impact absorption energy divided by the number of the impact samples (5). The device has the beneficial effects that the device can ensure that the sample is not distorted and deformed in the impact test process, the striking center position of the sample is proper, the impact absorption energy is within the accuracy of a testing machine, and the detection deviation is small.

The invention relates to the technical field of impact energy testing, and discloses a pendulum bob device based on single impact energy calibration, which comprises a bottom plate, and a slide block guide rail is arranged on the top surface of the bottom plate; one end of the swing rod module is connected with the bottom plate, and the other end is vertically upward; the top of the swing rod is hinged to the swing rod module, and the other end of the swing rod is connected with a swing block; the impact rod fixing module is matched with the sliding block guide rail; the cement block moving module is arranged at the end, away from the swing rod module, of the sliding block guide rail. An angle encoder; during use, the swing rod is lifted to a preset angle, the swing rod is released, the test rod exerts impact force on the stress surface of the cement block moving module, the swing angle variable quantity and the instantaneous angular speed of the swing rod are collected in real time through the angle encoder, and one-time impact calibration is completed. According to the invention, by arranging the swing rod module hinged with the swing rod, the swing rod can swing, and then the swing block used for fixing the test rod is connected with the swing rod, so that an existing free falling body test is changed into a simple pendulum test, the centering difficulty is reduced, and the test precision is improved.

The invention relates to the technical field of anti-stamping detection, and provides photovoltaic panel anti-stamping detection equipment which comprises a machine shell, an angle adjusting module, a falling point adjusting module, a cleaning module, a transmission module and an ice ball emitting module, a driving part in the angle adjusting module is in transmission connection with a rotating pipe, and a clamping part in the falling point adjusting module is used for fixing a photovoltaic panel; a Y-direction telescopic air cylinder is used for controlling a movable frame to be slidably connected into a swing frame, a scraping piece and a CCD camera in the cleaning module are both arranged on a base frame, the inclination angle of a photovoltaic panel below can be automatically adjusted, and the falling point of an ice hockey on the surface of the photovoltaic panel can be adjusted at any angle; the real scene that external force impacts the photovoltaic panel at a time from different positions can be simulated through multi-point intermittent ice hockey stamping detection, the natural environment that a plurality of hails continuously stamp the photovoltaic panel can be simulated through multi-point continuous ice hockey stamping detection, and stamping detection in different scenes can be simulated.

The invention discloses a low-pressure-difference high-frequency high-energy impactor driven by a large-drift-diameter turbine, which relates to the field of petroleum and natural industry and mechanical engineering and comprises an upper joint, a main shell, an adjusting gasket, a compression ring cylinder, a through compression ring, a compression rod, a turbine, a lower compression guide sleeve, a lower outer compression sleeve, a bearing, a hard alloy ring, a radial through valve, a rotating shaft and a rotatable two-way through valve. The device comprises an opening shell, a pressing piston, an impact hammer, a lower shell, an impact drill bit, an anti-falling ring and a lower connector. According to the low-pressure-difference high-frequency high-energy impactor driven by the large-drift-diameter turbine, the impact tail end water cushion effect can be avoided, the impact hammer tail speed is remarkably increased so as to increase the single impact energy, meanwhile, the impact frequency is improved, and finally the high-frequency and large-impact-energy efficient rock breaking effect is achieved.

The application discloses an impact test device based on electromagnetic loading. The device comprises a power supply system, an impact gun, a sensor data acquisition system and a clamp and bracket system. The impact gun converts the electric energy of the power supply system into electromagnetic force impact force to act on the to-be-impacted test piece fixed on the clamp and bracket system in the form of impact load. Before the test starts, the impact gun is in zero-distance contact with the to-be-impacted test piece, and the impact load is horizontally loaded in parallel to the ground. During the test, the sensor data acquisition system records the data of the impact force and deformation displacement of the test piece changing with time. After the test ends, the reaction force between the impact gun and the to-be-impacted test piece is consumed in the form of friction and temperature rise through the buffer system of the impact gun, so that the secondary impact on the to-be-impacted test piece is avoided. The energy storage capacitor and the charging voltage in the power supply system are variable. The application can solve the problems of complicated operation and single impact wave form of the current impact test equipment.

The triangular gate anti-collision energy dissipation structure comprises an anti-collision plate and energy dissipation devices, each energy dissipation device comprises an energy dissipation cylinder and a fixed base, the fixed bases are fixedly connected to a main beam, connecting rods are connected to the fixed bases, the top ends of the energy dissipation cylinders are provided with open holes allowing the connecting rods to penetrate, and the energy dissipation cylinders are arranged on the connecting rods in a sliding and sleeving mode; the other end of the energy dissipation cylinder is fixedly connected with the anti-collision plate, and a plurality of belleville spring sets are arranged in the energy dissipation cylinder. According to the anti-collision device, the multiple energy dissipation devices are distributed on the anti-collision plate, it is ensured that the collision force is effectively dispersed in a multi-point displacement and spring deformation mode when a ship collides, the stress of a single collision point is reduced, and therefore the damage risk of ship lock equipment is reduced. The belleville springs in the energy dissipation devices are combined differently according to the position, displacement and stiffness requirements of the energy dissipation cylinders, counter-force balance of all the positions is guaranteed, and local overload is avoided.

The invention discloses a spring damping buffer knocking hammer and a secondary impact prevention method, and belongs to the technical field of engineering detection and rock-soil exploration. The knocking hammer comprises a cylinder barrel, a piston, an energy storage spring, a hammering block, an extension spring and a driving device. Through the set limiting structure, the piston is instantaneously braked when being driven by the energy storage spring to move to the separation position, the hammering block overcomes the tension of the extension spring under the inertia effect to be separated from the piston, and single-time impact on the wall face is independently completed; after impact, kinetic energy rebounded by the hammering block is absorbed by the extension spring and pulled back, and therefore secondary impact is fundamentally eradicated. Stepless adjustment of impact energy is achieved through an adjusting bolt, fine control over the excitation frequency and energy distribution is achieved by replacing the material of the hammering head and a balancing weight, and reliable operation capacity is achieved under the multi-angle working conditions of a tunnel vault, the side wall, the ground and the like. The technical problems that energy of an existing excitation source is uncontrollable, secondary impact exists, and adaptability is poor are solved.