19results about How to "Avoid secondary impact" patented technology

The invention discloses a distribution line inter-phase permanent fault identification method and system based on SOP detection, and relates to the technical field of active injection protection. Based on an active detection idea, when an inter-phase short-circuit fault occurs in a distribution line containing SOP, a fault current limiting control measure is firstly started; limiting the output current of the fault side converter to be zero so as to enable the fault to extinguish arc; secondly, injecting pilot frequency positive sequence detection signals to obtain response characteristics by adopting a constant current injection strategy; solving the permanent fault equivalent model, and carrying out permanent fault identification by utilizing voltage structure similarity based on a model identification idea; and finally, fault isolation and power supply recovery are carried out based on a fault property identification result. Additional injection equipment is not needed, the fault property can be effectively judged, the fault section can be quickly determined under the permanent fault, and the power supply reliability of a power distribution system can be improved.

The invention discloses an electromagnetic lossless anti-collision method and device for a bridge pier stud, and the device comprises two annular circular pipes, the two annular circular pipes are provided with two moving devices used for rapidly moving on the two annular circular pipes, the right side of the right moving device is provided with a ship anti-collision device used for ship anti-collision, and the right side of the ship anti-collision device is provided with a ship anti-collision device used for ship anti-collision. A ship body stabilizing device is installed on the rear side of the left side moving device, a pier is arranged on the right side of the annular round pipe, and a plurality of fixed anti-collision devices are installed on the pier. And the moving device comprises a moving frame assembly, locking assemblies and a driving assembly, the moving frame assembly is installed on the annular circular pipe, and the two locking assemblies are installed on the upper side of the moving frame assembly. In this way, the height of each device away from the water surface can be independently adjusted, collision prevention and rapid maintenance are facilitated, non-contact collision prevention can be conducted, the ship deviation direction can be adjusted in an auxiliary mode after a ship collides with a pier, and the ship is prevented from colliding with the pier for the second time.

The utility model discloses an impact test bench which comprises a base, two vertical plates are fixedly connected to the upper surface of the base, two first supporting plates are fixedly connected to the side faces, close to each other, of the two vertical plates, and second supporting plates are connected to the ends, close to each other, of the first supporting plates through locking bolts. The top end of each second supporting plate is connected with a third supporting plate through a locking bolt. According to the device, the first supporting plate, the second supporting plate, the third supporting plate, the supporting block and the carrying plate are matched, the first supporting plate, the second supporting plate, the third supporting plate and the supporting block are connected, after the impact force borne by the carrying plate is increased, the angle between the second supporting plate and the first supporting plate and the angle between the second supporting plate and the third supporting plate are changed, and meanwhile the carrying plate can descend; after the impact head rebounds, the impact head does not collide with the test sample for the second time, so that secondary impact is avoided, the impact test effect is not affected, and meanwhile, the test sample is not damaged or deformed.

The invention relates to the technical field of anti-collision devices of thread scanner probes, and discloses an anti-collision device of a thread scanner probe, which comprises a scanning rotating shaft, and a protection cavity is formed in the scanning rotating shaft. According to the anti-collision device, the shearing force borne by the connecting part is larger than the adsorption force between a first powerful magnet block and a second powerful magnet block, at the moment, a first sliding round block drives a side head anti-collision sliding base to slide towards the end, close to a wire passing hole, of a protection cavity, and relative displacement is generated between a side head anti-collision fixing base and the side head anti-collision sliding base; when the computer detects that the input of the corresponding IO port is disconnected, the control software executes a collision exception handling program, at the moment, all control motor movement operations on the software are prohibited, a collision prompt window pops up, and the scanning rotating shaft stops driving the measuring head on the measuring rod to rotate; thus, secondary impact caused by continuous rotation of the measuring head is avoided, and the measuring head is protected from being further damaged.

The application relates to the technical field of power distribution control, in particular to an active power distribution network fault self-healing system and a method thereof, which comprises a data sensing module, a fault positioning module, an isolation control module, a fault self-healing module and a power supply recovery module, and realizes intelligent processing of the whole process from fault detection to power supply recovery through cooperation of the multiple modules. The system can quickly position faults based on FTU layout structure and operation data, optimizes analysis efficiency in combination with a GPU computing power dynamic distribution mechanism, and realizes accurate isolation of a fault area, self-healing repair and smooth grid recovery by using intelligent strategy generation and digital twin technology. The application effectively improves the power supply reliability, system stability and operation intelligent level of the power distribution network.

The invention relates to the technical field of liquid oxygen impact tests, in particular to a device and method for preventing a heavy hammer of a liquid oxygen impact testing machine from rebounding and falling back to secondarily impact a test piece, the device comprises a base, the upper surface of the base is provided with a test piece cup, and a firing pin is arranged above the test piece cup; the connecting seat is arranged above the base, and a heavy hammer is arranged on the lower end face of the connecting seat; the fixing rod is arranged on the upper surface of the base, and a lower limiting switch is arranged on the outer surface of the fixing rod; the air cylinder is arranged on the upper surface of the base, and the output end of the air cylinder is connected with a rubber damper; the device has the beneficial effects that the impact on a test piece in a liquid oxygen environment is simulated through the cooperation of the freely falling heavy hammer and the firing pin, when the connecting seat moves downwards along the guide rod, the lower limiting switch is triggered to send out a signal, the console sends out a signal to the electromagnetic valve after receiving the signal, and the electromagnetic valve controls the air cylinder to eject out the rubber shock absorber; and the counter weight after rebounding and rising is limited, so that the purpose of preventing the counter weight from rebounding and falling back to secondarily impact the test piece is achieved.

The invention discloses a zinc coating adhesion performance test device, which comprises a base, a first test table, a second test table and a third test table, the sliding seat is horizontally and slidably connected to the base, a screw rod is horizontally and rotatably connected to the base, and the screw rod is in threaded connection to the sliding seat; the knocking hammer is rotationally connected to the sliding seat; the supporting frame is vertically arranged at the rear end of the sliding seat; the supporting rod is horizontally connected to the upper end of the supporting frame in a threaded mode, and the position of a hammer head of the knocking hammer leans against the supporting rod, so that the knocking hammer is in a vertical state; the fixing mechanism is arranged at the front end of the sliding seat and is used for fixing the test piece. The device has the following advantages and effects: the sliding seat is arranged to drive the knocking hammer to move, so that the falling point position of the knocking hammer is adjusted, the test requirements of different test pieces are met, the accuracy is ensured, different falling point positions of the knocking hammer can be quickly positioned when the same test piece is tested, the quick test of different positions of the test piece is met, and the test efficiency is improved. And the test efficiency and the test accuracy are improved.

The present invention provides a pendulum impact source excitation device based on SH waves, comprising a mobile body and a striking module, a driving module and an anvil mounted on the mobile body; the striking module comprises a heavy hammer with a rotating shaft at the end; the driving module comprises an impact cylinder that strikes the heavy hammer to make it swing around the rotating shaft in a vertical plane, a clutch and a hydraulic motor connected to one end of the rotating shaft, and a brake connected to the other end of the rotating shaft; the anvil is arranged at the lowest point of the swing trajectory of the heavy hammer to receive the impact of the heavy hammer to generate an acceleration transverse wave, and the brake locks the rotating shaft after the heavy hammer hits the anvil. Beneficial effects of the present invention: the generated SH wave has large output energy, large detection depth, and high resolution, and can be applied to deep exploration of underground space.

The invention provides a hybrid power disaster simulation experiment device under a cyclic dynamic load condition, which comprises a main body supporting mechanism, and is characterized in that the main body supporting mechanism comprises a top beam, a base and a stand column vertically supported between the top beam and the base, a driving mechanism is arranged at the lower end of the top beam, and the driving mechanism is connected with a lifting mechanism; the lifting mechanism is connected with the heavy hammer mechanism, an auxiliary testing mechanism and a monitoring mechanism are arranged on the base, and the monitoring mechanism is arranged above the auxiliary testing mechanism and connected with the auxiliary testing mechanism; a sample mechanism is arranged in the monitoring mechanism. According to the invention, a hybrid dynamic disaster simulation experiment under a cyclic dynamic load condition is realized, and data of absorption energy of samples including coal rock and other samples can be obtained under the condition of hybrid dynamic disasters through a drop hammer and a residual impact energy testing device; and the output of different impact energy is realized by changing the mass or height of the heavy hammer mechanism. The experimental device is simple in energy conversion and ensures the accuracy of an output energy value.

The invention belongs to the technical field of anti-impact protection engineering and intelligent material application, and particularly relates to an active self-adaptive high-impact-resistant buffering device based on the synergistic effect of foamed aluminum and a dielectric elastomer. According to the device, foamed aluminum and a dielectric elastomer are innovatively combined, and an energy absorption-immobilization dual protection mechanism is constructed; a foamed aluminum layer performs passive energy absorption by utilizing buckling deformation of a porous structure, so that effective attenuation of an impact load and uniform distribution of stress are realized; the dielectric elastomer layer is used as an intelligent soft material, a control algorithm is introduced, remarkable electrodeformation and variable stiffness characteristics are generated along with the increase of the electric field intensity under impact, and active expansion hardening is carried out to fill structural gaps generated after foamed aluminum deformation. Compared with a traditional passive protection technology, the buffering device has the advantages that efficient buffering is achieved, meanwhile, equipment displacement and oscillation caused by deformation of the buffering layer are effectively prevented, secondary impact caused by rebounding of the buffering structure after impact can be effectively restrained, and the reliability of test data and the survivability of equipment in the high-impact environment are remarkably improved.

The utility model relates to the technical field of battery and product shell test equipment, and discloses an impact test device, which comprises a base provided with a test bench, and the test bench is provided with a test center point; the supporting frame is assembled on the base; the positioning pipe is provided with a center hole, and the central axis of the center hole passes through the test center point; the baffle has an opening state for opening the central hole and a closing state for at least partially closing the central hole; the driver is in transmission connection with the baffle; the limiting sensor is used for sensing one end, close to the test bed, of the test ball passing through the positioning pipe; and light emitted by the laser positioner passes through the test center point. The laser positioner can point out the test position of a test object, when the test ball passes through the positioning pipe, the driver adjusts the baffle to be switched to the closed state to close the center hole, no space for secondary bounce exists between the test table and the baffle, the test ball is prevented from secondarily impacting the test object after bounce, and the accuracy of test data is guaranteed.

The invention relates to the technical field of die casting, in particular to heat dissipation shell die casting equipment which comprises a fixed die and a movable die. A buffering unit is arranged on the periphery of the movable mold and comprises a buffering sleeve arranged in the vertical direction, a buffering groove is formed in the buffering sleeve in the vertical direction in a penetrating mode, the sections of an upper opening and a lower opening of the buffering groove are large, the section of the middle section of the buffering groove is small, and a buffering block is arranged on the lower portion of the buffering groove in a sliding mode in the vertical direction. A pressing plate is slidably arranged on the upper portion of the middle section of the buffering sleeve in the vertical direction, hydraulic oil is arranged in the buffering groove between the buffering block and the pressing plate, a first gap exists between the pressing plate and the upper end of the buffering sleeve, and a first spring is arranged in the first gap in the vertical direction. A bearing plate is arranged at the upper part of the fixed mold. The safety of the movable mold and the fixed mold during daily operation is guaranteed, and meanwhile the abrasion loss of the movable mold and the fixed mold during contact is reduced.

The present invention discloses a component limiting device and an electrical control cabinet, comprising: a bracket; a locking mechanism, installed at one end of the bracket, comprising an end support and an intermediate ring, the end support is connected to the end of the intermediate ring; the intermediate ring is equipped with power teeth, the end support is equipped with a limiting structure, the power teeth are transmission-connected to the limiting structure, and the limiting structure is used to lock the components; a tensioning mechanism, installed on the bracket and connected to the power teeth; the tensioning mechanism is used to pull the power teeth and fix their positions, thereby driving the limiting mechanism to lock the components. A plurality of components and component limiting devices are installed in the electrical control cabinet. A component limiting device and an electrical control cabinet according to an embodiment of the present invention have a compact structure, are easy to install, and can accommodate larger processing errors, thereby improving the fatigue strength of the front-end constraints of components under vibration-resistant conditions.

This invention belongs to the field of lead screw transmission technology and discloses a lead screw end limiting and buffering structure, including a lead screw and a limiting and buffering device. The limiting and buffering device is located at the end of the lead screw. When the nut on the lead screw moves to the end of the lead screw, the limiting and buffering device first limits the axial and rotational movement of the nut. When the limiting torque set by the limiting device is exceeded, the limiting device fails, thereby buffering. The buffer is located between the fixed part and the rotating part. The closer the distance between the fixed part and the rotating part, the greater the force exerted by the buffer on the rotating part. During normal operation, this invention achieves a reliable mechanical limiting function through the limiting pin, with high limiting accuracy. Under abnormal impact conditions, the limiting pin fails at the set torque threshold, limiting the peak instantaneous impact load below the set value, effectively protecting the lead screw, nut, and other structural components from damage, and avoiding the problem of excessive impact load generated by rigid limiting structures.

This invention discloses a large-tonnage pile foundation testing machine, comprising a base assembly and a hammer assembly. The base assembly includes a base mechanism and a force transmission mechanism, with the force transmission mechanism movably disposed within the base mechanism. The hammer assembly includes a drop hammer frame mechanism and a lifting mechanism. The core of this invention is a modular structure consisting of a base assembly and a hammer assembly. The frame and the base of the base mechanism are detachably connected. The positioning blocks of the base and the positioning holes of the frame form a precise fit, enabling rapid pre-positioning of both. The matching locking mechanism ensures a secure connection between the frame and the base. The disassembly and assembly process requires no complex procedures, and the equipment can be moved flexibly and conveniently. This structure allows for individual adjustment of each assembly component according to testing needs, adapting to the working space and testing requirements of different construction sites, significantly improving the efficiency of multi-point testing at construction sites.

The invention relates to the technical field of bridge engineering, in particular to a multi-energy-consumption pier anti-collision device and a construction method thereof. The pier anti-collision device comprises an anti-collision sleeve arranged on the periphery of a pier, and a plurality of spherical hinge structures are arranged on the periphery of the anti-collision sleeve at intervals in the circumferential direction of the anti-collision sleeve; the anti-collision modules are arranged in the peripheral direction of the anti-collision sleeve at intervals, the anti-collision modules are sequentially connected in series through elastic cables in an elastic tensioning mode to form an overall tensioning structure, and the anti-collision modules are hinged and fixed to the anti-collision sleeve through spherical hinge structures in a one-to-one correspondence mode. Therefore, the technical problems that in the prior art, energy consumption is single, the energy absorption efficiency is low, the adaptive capacity is poor, impact at different angles is difficult to deal with, the buffering effect is poor, an impact object cannot be guided to be separated after impact, and secondary impact is likely to be caused are solved.

The invention relates to a micro-control animal experiment striking device which is characterized in that when an animal is subjected to a striking experiment, the experimental animal does not need to be fixed, and a striking head can quickly and accurately align a working area channel SH to the position of a to-be-struck part of the experimental animal no matter how the experimental animal moves in a sealing body and how the posture is changed. In addition, the striking force of the experimental striking device can be adjusted, and the core rod can be quickly withdrawn after striking, so that secondary striking is avoided, and the accuracy of experimental data is ensured. In addition, the end part of the striking head can be replaced, so that different experiment conditions can be simulated.

The present application belongs to the technical field of wide frequency oscillation suppression of sea wind flexible transmission and delivery system, and discloses a method, system, device and medium for online suppression of wide frequency oscillation of sea wind flexible transmission and delivery system based on intelligent decision-making of operating state, to solve the problems that the prior art is difficult to adapt to operating state changes, intelligent control actions are easy to cause operating out-of-limit and lag of suppression response. The method comprises: obtaining real-time data of operating state and pre-processing grid-connected point voltage and current signals to obtain window data; performing online oscillation mode identification based on the window data, and extracting oscillation mode features; constructing intelligent decision-making state variables according to the oscillation mode features and the real-time data of operating state, and inputting the intelligent decision-making state variables into a pre-trained intelligent decision-making model to output original additional power regulation instructions; obtaining preset operating constraints and constructing a dynamic safety boundary in combination with the current operating state to perform safety checking and correction on the original instructions; and superimposing the corrected instructions into a power control loop to perform online suppression.

Embodiments of the present application provide a servo control method and device, electronic equipment and computer readable storage medium, and relate to the technical field of mechanical hand. The method comprises: obtaining the angular position, angular velocity and torque current feedback of the motor in the current control period; estimating the state vector of the current control period online through a modal energy observer, obtaining an inertia reshaping coefficient according to the estimated value of the equivalent inertia and the preset virtual reference inertia, and determining at least one current compensation amount for inhibiting torsional vibration or vibration excitation according to the inertia reshaping coefficient; and superimposing the at least one current compensation amount to the torque instruction of the current control period of the current loop. The embodiments of the present application effectively inhibit the torsional vibration under high load inertia ratio, and significantly shorten the end stabilization time.