32results about How to "Fast action" patented technology

The present invention provides a protection method for a new energy line with a high proportion of polarity differences of the first four voltage traveling waves. The method first derives the expression of the refraction-reflection coefficient of the wave impedance discontinuity point and obtains its value range. Then, according to the refraction-reflection process of the traveling wave when faults occur at different positions, the expression of the line mode voltage traveling wave at the protection installation is derived. The polarity characteristics of the first four voltage traveling waves when faults occur at different positions can be obtained by using the value range of the refraction-reflection coefficient, and it is concluded that the polarities of the first four voltage traveling waves are the same when there is a fault outside the zone, and the polarities of the first four voltage traveling waves are different when there is a fault inside the zone, and fault identification is performed based on this. The method uses the polarity characteristics of the traveling wave for fault identification. Compared with time characteristics and amplitude characteristics, polarity characteristics are easier to identify and have higher reliability, small calculation amount, and wide application range. At the same time, this scheme is a single-ended quantity protection, which has the advantages of no need for communication and fast action speed, and can reliably identify faults.

The invention relates to the technical field of check valves, and particularly discloses a high-precision pneumatic check valve which comprises a metal valve shell, mounting flanges are fixedly mounted on the left side and the right side of the valve shell, an access cover plate is fixedly mounted at the upper end of the valve shell through bolts, and an internal partition plate is fixedly mounted in the middle of the interior of the valve shell. A communicating hole is formed in the middle of the inner partition plate, and a sealing plug is arranged over the communicating hole. According to the high-precision pneumatic check valve, the novel structural design is adopted, when the pressure on the left side in the valve shell is reduced, the sealing plug is pushed to move downwards under the elastic acting force of reset elastic force, the purpose of automatic sealing and check is achieved, at the moment, the pressure sensor can also detect that the pressure is reduced, and therefore the control air pump is controlled to be started; the air pump is controlled to assist in pushing the sealing plug to move downwards, the action speed of the sealing plug is increased, and the situation that the control accuracy of the valve is affected due to slow action under the elastic action is avoided.

The invention discloses a surrounding edge separation and suction conveying device and method for carton forming. The surrounding edge separation and suction conveying device comprises a surrounding edge storage assembly, a surrounding edge left-right movement driving assembly, a surrounding edge suction assembly and a surrounding edge up-down movement driving assembly. The surrounding edge left-right movement driving assembly is installed on a stock bin bottom plate of the surrounding edge storage assembly, the surrounding edge suction assembly is arranged at the position, corresponding to the surrounding edge suction position on the surrounding edge storage assembly, of the surrounding edge storage assembly, and the surrounding edge suction assembly is connected with the surrounding edge up-down movement assembly through a linear sliding rail. The mode that a vacuum suction cup of the surrounding edge suction assembly is combined with a cam driving structure in the surrounding edge left-right movement driving assembly and a cam driving structure in the surrounding edge up-down movement driving assembly is adopted, precise motion control and positioning can be provided through cam driving, rapid action and response speed are made in time, and it is accurate that the vacuum suction cup can provide suction force; and a vacuum breaking assembly in the surrounding edge sucking assembly can achieve the purpose that the surrounding edge is rapidly separated from the surface of a vacuum suction cup, and high-speed and efficient surrounding edge feeding is achieved.

The application discloses a novel full-line fast distance protection method under a power system, which comprises the following steps: S1, continuously monitoring the voltage and current on one side of the line, and starting the protection when detecting that the current mutation variable exceeds a set threshold; S2, establishing an accurate line differential equation based on a pi type equivalent model; S3, constructing the differential equation in the time domain by using the collected voltage and current data, and directly and real-timely solving the equivalent transition resistance of the fault point; S4, establishing a relationship model of the additional measurement impedance and the equivalent transition resistance, accurately compensating the apparent impedance measured by the protection device, and accurately calculating the real distance from the protection installation to the fault point; and S5, comparing the calculated fault distance with a preset protection section, and realizing the fast isolation of the fault; the application has the advantages of weak feed adaptability improvement, strong anti-transition resistance capability, long line anti-maloperation optimization and fast action speed, and can provide effective technical support for the main protection configuration of new energy sending-out lines and high-proportion power electronic power grids.

The utility model discloses a quick-action eccentric butterfly valve, which relates to the field of butterfly valves and comprises a valve body, a limit ring is mounted in the valve body, two butterfly plates are mounted in the valve body, the surfaces of the two butterfly plates abut against the surface of the limit ring, and the two butterfly plates are mounted and connected through a mounting hinge. Mounting shafts are mounted on the surfaces of the two butterfly plates, the two mounting shafts are located at the two ends of the butterfly plates respectively, and the two mounting shafts are concentric shafts. According to the eccentric butterfly valve capable of acting quickly, the butterfly plates, the first bearing and the installation hinge are arranged, the two butterfly plates are combined into a circular plate, installation is conducted through the first bearing and the installation shaft, the first bearing can guarantee stable and smooth rotation of the butterfly plates, meanwhile, the two butterfly plates are installed through the installation hinge, and therefore the installation efficiency is improved. The two butterfly plates can be opened and closed, the tightness of connection between the two butterfly plates is guaranteed, meanwhile, the two butterfly plates can be closed conveniently through the impact force of fluid, the structure is simple, and the error-tolerant rate is large.

The invention discloses a transformer protection method and system based on positive sequence differential current energy abrupt change. The method comprises the steps of calculating a positive sequence differential current energy value in a single sampling interval of each phase based on positive sequence differential current of each phase on two sides of a transformer; calculating a positive sequence differential flow energy abrupt change value of each phase based on the positive sequence differential flow energy value; summing the sliding windows, and calculating the sum of the positive sequence differential current energy abrupt change values of each phase of the transformer corresponding to each sliding window based on the positive sequence differential current energy abrupt change values corresponding to the sampling points in each sliding window; and for any phase, if the sum of the positive sequence differential flow energy abrupt change values of any phase corresponding to a preset number of continuous sliding windows meets a preset criterion, protection action is performed. According to the method, the protection device does not operate mistakenly, the action speed of transformer protection after a serious fault occurs in the transformer is improved, meanwhile, the fault is isolated, and influence and serious damage to equipment and a system are avoided.

The utility model relates to the technical field of circuit breakers, and discloses an instantaneous tripping circuit breaker which comprises a bottom plate, a handle convenient to toggle is arranged above the bottom plate, the handle is located on the inner side of the bottom plate and connected with a pull rod, the front face of the bottom plate is hinged to a moving contact assembly through a fixing shaft, and the bottom plate is hinged to a jump pin through the outer side of the fixing shaft. The outer side of the fixed shaft is movably connected with a moving contact assembly which is in contact with the static contact assembly for electrification, the moving contact assembly is hinged with a lock catch through a movable shaft, the surface of the lock catch is provided with a fixed hole, the end part, far away from the handle, of the pull rod extends into the inner side of the fixed hole, and the side surface, close to the jump pin, of the lock catch is clamped with the side surface of the jump pin. Instantaneous characteristics of various specifications are met by utilizing the types of the torsional springs, the number of turns of the coils and different assembly positions of the torsional springs, and compared with a traditional product, the process is simple, the number of parts is reduced, and the process consistency is easy to control.

The application discloses a transformer de-blocking of inrush current implementation method, device, medium and equipment. The method comprises the following steps: calculating the differential current sampling value mutation of the transformer corresponding to the sampling point in the first predetermined time interval; in the case that the differential current sampling value mutation of the two continuous sampling points meets the starting criterion, the time corresponding to the latter sampling point is determined as the first starting time; after the second predetermined time interval from the first starting time, in the case that the differential current sampling value mutation of the two continuous sampling points meets the starting criterion, the time corresponding to the latter sampling point is determined as the second starting time; after the first starting time, whether to send a blocking signal is determined according to the differential current sampling value mutation and the intermittent angle blocking criterion; whether to send a blocking signal is determined according to the differential current sampling value mutation of the two sampling points of the second starting time and the intermittent angle blocking criterion, and whether the transformer is de-blocked from the excitation inrush current is determined.

The application discloses a novel IGBT high-voltage capacitor pre-charging system, and belongs to the technical field, comprising: a DC power supply module for providing a high-voltage input voltage; a high-voltage capacitor module connected in parallel with the DC power supply module for storing electric energy; and two IGBT single-pipe switches (IGBT1 and IGBT2). The application adopts IGBT components as switching elements, and thus has many advantages, the action speed of the IGBT is extremely fast, the switching action can be completed within several us, the pre-charging power-on time is shortened, the IGBT has no mechanical wear, the service life is longer than that of a mechanical relay, and the switching life can reach more than several million times, no electric arc is generated during the switching process of the IGBT, and thus no contact ablation is caused, and thus the arc extinguishing problem does not need to be considered, the IGBT has a small size, is convenient to integrate and layout, and can monitor parameters such as current and temperature in the circuit control design, and thus more accurate control can be realized.

The invention relates to the technical field of electric power automation, and provides a distance protection method and system based on fault quantity network characteristics, and the method comprises the steps: carrying out the analysis to obtain a fault state network equivalent circuit and a fault component network equivalent circuit of a double-end power system under an R-L model; obtaining a distance measurement equation according to the fault point current equation and the fault point voltage equation; integral taking processing is carried out on two sides of the distance measurement equation; a sliding window lists a linear equation to obtain a ranging overdetermined equation set; solving the distance measurement overdetermined equation set to obtain a single-phase system fault distance measurement result; expanding the analysis and calculation process of the single-phase system in the previous step to a three-phase system, constructing and solving a linear equation distance measurement formula when a single-phase earth fault and an inter-phase fault occur, and obtaining a fault distance measurement result of the three-phase system; and comparing the distance measurement result with the setting method, and determining whether the fault is an internal fault or an external fault. The method has high robustness, and can adapt to the parameter change of the power system and the dynamic characteristics of the system.

A PPU combined mechanical hand is characterized in that motors of X-axis movement modules, Y-axis movement modules and C-axis movement modules are all installed on a base and transmission connection is realized through light telescopic rods. Its advantages are that X-axis movement modules, Y-axis movement modules and C-axis movement modules are additionally arranged on X-axis guide rails of a PPU driving module, the limitation that a conventional PPU mechanical hand can only move for two-point grabbing is solved, and the PPU mechanical hand can meet automatic picking operation in a larger range; meanwhile, all motors for driving X-Y-C movement modules are installed on a machine base, and transmission connection is realized through light telescopic rods, the moving weight borne by the PPU driving module is greatly reduced, and thus the PPU driving module can move faster and the overall operation speed is improved.

The invention provides a conductive loop of a molded case circuit breaker, which mainly solves the problems of insulation protection and quick action in the fault current breaking process of the molded case circuit breaker, and comprises a contact piece, a contact, a rotating shaft, a shell, a protective cover, a flexible connector, a conductive piece, a fixed piece and an elastic piece. The contact is tightly attached and fixed to one end of the contact piece, the other end of the contact piece is fixedly conducted with one end of the flexible connector, the other end of the flexible connector is fixedly conducted with the conductive piece, and the contact, the contact piece, the flexible connector and the conductive piece are sequentially connected and conducted to jointly form a conductive loop of the molded case circuit breaker. The flexible connector is provided with an upper flexible section and a lower flexible section, and the space between the upper flexible section and the lower flexible section is hollow, so that circulation of heat dissipation air in the middle is facilitated, and related heat is taken away. Through the electromagnetic force between the upper flexible section and the lower flexible section, the speed of the upward overturning action of the contact piece is increased, and the molded case circuit breaker can cut off current more quickly. A conductive section protective tongue arranged on the protective cover is coupled with the limiting block, so that the contact piece is isolated from the arc extinguishing cavity in the shell, and the contact piece is prevented from being damaged by high-temperature metal particles and non-metal particles in the arc extinguishing cavity when the molded case circuit breaker breaks current.

The utility model discloses a compact environment-friendly gas-insulated circuit breaker, which comprises an external gas tank, a vacuum circuit breaking structure is arranged in the external gas tank, the vacuum circuit breaking structure comprises an assembly support which is arranged in the external gas tank and comprises a left side plate, a right side plate, an upper plate, a middle plate, a lower plate, a back plate and four middle partition plates, the upper plate, the middle plate, the lower plate, the back plate and the middle partition plate are spliced through a mortise and tenon joint structure, and the assembling support and a bottom support on the inner wall of the external air box are fixedly connected with a grounding copper bar. According to the compact type environment-friendly gas insulation circuit breaker, the vacuum circuit breaking structure is installed and supported through the assembling support, so that the whole structure is compactly arranged, metal plate and other metal piece materials used by the whole are reduced, the total mass of a cabinet body is lighter, field installation and implementation are facilitated, and the three permanent magnet operating mechanisms are still adopted; the reliability which cannot be achieved by a spring structure is high, and maintenance is avoided.

The invention relates to a DC line protection method and system for a multi-terminal flexible DC system, belongs to the technical field of relay protection, and solves the problem that the DC line protection of the multi-terminal flexible DC system in the prior art is difficult to ensure accurate identification of a DC line fault under a low communication requirement. Comprising the steps of collecting voltage and current of current-limiting reactors at two ends of a DC line to be protected in the multi-terminal flexible DC system before and after a fault occurs, and further obtaining voltage break variables and current break variables of the current-limiting reactors at the two ends of the DC line to be protected when the high-frequency component frequency is omegaf; then obtaining the sudden change energy of the current limiting reactors at the two ends of the direct current line needing to be protected when the high-frequency component frequency is omega f; according to the sudden change energy of the current limiting reactors at the two ends of the direct current line needing to be protected when the high-frequency component frequency is omega f and the fault protection criterion, whether an internal fault occurs in the direct current line needing to be protected or not is determined; and if yes, starting a protection action of the direct-current line needing to be protected.

A leakage protection method for a low-voltage distribution system based on the variation of residual current at both ends belongs to the field of relay protection for distribution networks. Traditional leakage protection methods only use the amplitude information of residual current at one end, which has poor selectivity, is prone to false operation, has slow action speed, and low sensitivity. The present invention proposes a leakage protection method for a low-voltage distribution network based on the variation of residual current at both ends, which can be implemented based on a distribution Internet of Things platform, and uses the amplitude of the variation of residual current at both ends of the protected section as a comprehensive protection criterion. When the criteria at both ends meet the requirements of their respective setting thresholds, the protection is activated to achieve leakage protection. This method comprehensively utilizes the phasor information of residual current at both ends of the section. On the one hand, it can eliminate the influence of factors such as unbalanced leakage current of the line during normal operation, thereby improving the protection utilization rate; on the other hand, it does not require multi-stage delay coordination, and has a fast action speed; at the same time, it has a low setting threshold and high sensitivity.

The invention relates to the field of power system protection, and relates to a transient characteristic-based distributed power supply-containing power distribution network islanding protection method, which comprises the following steps of: acquiring distributed power supply grid-connected point data, and determining a voltage setting value of islanding protection and an impedance setting value of islanding protection; determining an island protection setting value; obtaining harmonic impedance of the grid-connected point, and determining a harmonic voltage effective value according to the harmonic impedance; determining a voltage continuity parameter according to the harmonic voltage effective value and the voltage setting value, and determining an impedance continuity parameter according to the harmonic impedance and the impedance setting value of the grid-connected point; determining an island fusion action value; judging whether an island protection condition is met or not based on the island fusion action value and the island protection setting value, if yes, judging that the distributed power supply has an island, and otherwise, collecting data again; according to the method, the island protection criterion based on voltage and impedance is formed by using the weighting coefficient, the operation mode of the power distribution network is comprehensively judged from two aspects, and the probability of operation refusal and misoperation of island protection is effectively reduced.

The invention discloses a direct drive type steam turbine valve control device, and relates to the technical field of steam turbines, the direct drive type steam turbine valve control device comprises a spring cover, a spring seat, a spring, a guide seat, a hydraulic servo-motor, a hydraulic servo-motor nut and a coupler assembly, and a spring cavity is formed between the spring seat and the spring cover; a guide sleeve is arranged in the middle of the spring cover, self-lubricating bearings are fixed in the middle of the spring seat and the guide sleeve, and the two ends of the guide seat are in shaft diameter fit with the self-lubricating bearings respectively; a positioning convex ring is arranged on the guide seat; a spring is arranged in a spring cavity; a threaded section is arranged at the end of a piston rod of the hydraulic servo-motor, the piston rod moves leftwards and extends to the left end of the guide seat, and the threaded section is connected with a valve rod through a coupler assembly. The hydraulic servo-motor nut is arranged at the left end of the guide seat and is in threaded connection with the threaded section. According to the invention, the axial guiding and centering functions of the moving part are realized, the guide seat is lubricated, the friction force of the moving part is greatly reduced, and the device can be widely applied to the control of high-thermal-parameter steam turbine valves in various arrangement forms.

A circuit breaker comprises a shell, and a phase pole and a leakage protection pole of the circuit breaker arranged side by side on both sides of the shell, characterized in that: the leakage protection pole comprises a zero-sequence current transformer, a leakage operating mechanism, a leakage testing mechanism, and a neutral pole static contact and a neutral pole moving contact relatively arranged in the shell, the phase pole of the circuit breaker comprises a phase pole operating mechanism, and a static contact and a moving contact relatively arranged, the moving contact is connected to the phase pole operating mechanism, the main circuit of the phase pole of the circuit breaker passes through the zero-sequence current transformer, the testing mechanism forms a test circuit with double breakpoints through two contact points, a first contact part and a second contact part on an elastic part, and the first contact part is driven by a neutral line driving member connected to the neutral pole moving contact to contact the first contact member, the neutral line driving member is connected to the phase pole operating mechanism or the leakage operating mechanism, it can ensure that the test circuit is not turned on when the phase pole of the circuit breaker is opened by pressing the test button, thereby improving the reliability of the circuit breaker.

The invention discloses a wetting and spraying device of a marine engine air cooler, which comprises a wetting and spraying water tank, a wetting and spraying water pump, a wetting and spraying valve group and a wetting and spraying control box, the wetting and spraying water tank is used for storing and supplying spraying water, circulating water is introduced into the water tank through a three-way valve to serve as a main water source, and the wetting and spraying water pump is connected with the wetting and spraying valve group. Fresh water is supplemented through the water injection valve only when necessary, so that the lowest use liquid level of the water tank is kept; the wetting and spraying water pump supplies water to the wetting and spraying valve group; the wetting and spraying valve group comprises a plurality of spraying valves, the wetting and spraying valve group is controlled by the wetting and spraying control box to perform spraying operation on the air cooler according to a set cycle period and flow, and comprehensive cleaning of the air cooler is ensured; the wetting and spraying control box indicates opening and closing of the three-way valve and the water injection valve, issues a starting or stopping instruction to the wetting and spraying water pump, and controls the action time of each spraying valve in the wetting and spraying valve set and whether the spraying valves are used or not.

The utility model discloses a high-speed switch nozzle applied to an ink-jet printer, which comprises a nozzle body, an ink quantifying cavity is arranged in the nozzle body, a nozzle is embedded at one end of the nozzle body, and the nozzle is communicated with the ink quantifying cavity; an ink injection connector is arranged at the position, corresponding to the ink quantifying cavity, of the nozzle body in a penetrating mode. A permanent magnet movable valve element is arranged in the ink quantifying cavity in a sliding mode, and a reset spring is arranged on the side, away from the nozzle, of the permanent magnet movable valve element in the ink quantifying cavity. The position, corresponding to the permanent magnet movable valve element, of the outer wall of the spray head body is fixedly sleeved with an electromagnetic coil. According to the utility model, the nozzle and the needle valve are integrally designed, so that ink retained in a channel is effectively reduced, the control response speed of the nozzle is structurally improved, and the permanent magnet is adopted to replace an electromagnet to serve as the movable valve core, so that the structural complexity of the needle valve is reduced, and the volume of the valve body is reduced.

The utility model provides an axial piston type pneumatic actuator. The axial piston type pneumatic actuator comprises a shell; the rotating shaft is rotationally mounted in the shell; the cylinder body is arranged in the working cavity, the cylinder body and the rotating shaft are fixedly connected and can rotate synchronously, a plurality of piston holes are formed in the lower end of the cylinder body, and the piston holes are circumferentially and uniformly distributed around the axis of the rotating shaft; the piston unit is arranged in the piston hole in a sleeved mode and can slide in the axial direction, and the sliding direction of the piston unit is parallel to the rotating axis of the rotating shaft; the guide curved surface is arranged in the working cavity and can be in contact with the end part of the piston unit; the air distribution disc is arranged in the shell and used for supplying air to the piston holes and exhausting air from the piston holes, so that the piston units sequentially move in a reciprocating mode and drive the cylinder body and the rotating shaft to rotate. The axial piston type pneumatic actuator is compact in structure, small in occupied space, suitable for various narrow installation environments, high in axial force transmission efficiency and capable of effectively reducing energy loss.

The utility model relates to the technical field of box opening equipment, and discloses a box opening device and a box unpacker, the box opening device comprises a fixed mounting plate and a cover folding plate which are rotatably connected, one side of the fixed mounting plate is provided with a first suction cup, the other side of the fixed mounting plate is provided with an overturning driving piece, and the cover folding plate is arranged to be of a hollow structure; a second suction cup is installed on the hollowed-out structure in a penetrating mode, the output end of the overturning driving piece is rotationally connected with the cover folding plate, the overturning driving piece is used for driving the cover folding plate to rotate relative to the fixed installation plate, and the first suction cup and the second suction cup are used for adsorbing the first side face and the second side face which are adjacent to each other on the paper shell box correspondingly. The box opening device is simple in box opening action and structure, rapid and stable in box opening process, high in efficiency and capable of meeting the box opening requirements of cardboard boxes of multiple specifications.

The hydraulic control brake valve comprises a valve body, a valve rod, a first spring, a valve sleeve and a feedback valve element, an inner cavity is formed in the valve body, the valve rod is inserted into the inner cavity and is in sliding connection with the valve body, the valve sleeve is inserted into the inner cavity and is fixed relative to the position of the valve body, and the two ends of the first spring are connected with the valve rod and the main valve element correspondingly; the main valve element is located in a valve sleeve inner cavity of the valve sleeve and connected with the valve sleeve in a sliding mode, a main valve element inner cavity is formed in the main valve element, the feedback valve element is inserted into the main valve element inner cavity, the main valve element is connected with the feedback valve element in a sliding mode, and the main valve element inner cavity is communicated with the valve sleeve inner cavity. The main valve element inner cavity is formed in the main valve element and blocked through the feedback valve element, so that hydraulic oil acts on the inner wall of the upper end of the main valve element to provide upward feedback force, the magnitude of the feedback force is directly separated from the main valve element, the diameter of the main valve element continues to be increased, the flow is increased, and the action speed of the brake is increased; the braking speed is accelerated, and the safety is improved.

The present invention discloses a double-terminal transient quantity protection method, system and device based on oscillation frequency, which relates to the field of line protection. By determining the oscillation characteristics of the line system after a fault occurs, the oscillation component and the power frequency quantity are separated in a short time window, and then the fault is identified by their relative relationship and the energy of the power frequency quantity. Under the condition that the fault outside the area is not misoperated, the reliable action of the fault inside the area can be achieved in most cases. The present invention can effectively improve the action speed of the protection and improve the reliability of the protection. At the same time, the present invention has low requirements on the algorithm, strong engineering feasibility, and has broad application prospects.

The invention discloses a low-resistance circuit breaker for a low-temperature environment, and relates to the field of superconducting magnets, and the main points of the technical scheme are that the low-resistance circuit breaker comprises a power mechanism which is used for providing a normally-closed down force and a rapid-disconnection separating force for a circuit breaking contact; the circuit breaking contact is used for keeping normally closed under the action of downward pressure when the superconducting magnet operates normally, and is quickly disconnected under the action of separating force when the superconducting magnet is abnormal; the box body is used for providing an independent vacuum environment for the circuit break contact and is connected with an external conductor and a liquid nitrogen pipeline; and the cooling conductor is used for providing a superconducting path and continuously cooling the superconducting path. The low-temperature and low-resistance circuit breaker is adopted according to the energy release requirement of the high-temperature superconducting magnet, the problem of continuous large heat leakage load from a normal-temperature end to a low-temperature end caused by using a normal-temperature circuit breaker is solved, the refrigeration power of daily operation of the magnet is greatly reduced, and the operation economical efficiency of the magnet is improved.

The application discloses a DC transmission line asynchronous protection method and system based on a voltage short window relay, and comprises the following steps: calculating a voltage differential value of a rectifier side of a DC transmission line; determining a positive rate of change voltage differential value of the rectifier side of the DC transmission line according to the voltage differential value; constructing a first criterion of DC transmission line asynchronous protection according to the positive rate of change voltage differential value and a voltage short window relay setting value; calculating current differential values of the rectifier side and an inverter side of the DC transmission line; constructing a second criterion of DC transmission line asynchronous protection according to the current differential values of the rectifier side and the inverter side and a sudden change asynchronous differential relay setting value; and when the first criterion and the second criterion are simultaneously satisfied, the whole protection is operated. The method can greatly improve the sensitivity of high-resistance fault protection.

The present invention discloses an artificial muscle imitating plant tendrils, including an artificial muscle tendril body, the artificial muscle tendril body including a silicone skin, a paper-cut structure and a restriction layer, the paper-cut structure is sealed and installed inside the silicone skin, a flexible circuit is etched on the paper-cut structure, and the restriction layer is fixedly installed on the bottom of the silicone skin after pre-stretching. The present invention also discloses a human-like arm and a testing method thereof, the human-like arm includes a large arm unit, a small arm unit and the artificial muscle imitating plant tendrils, the artificial muscle roll is made by imitating plant tendrils with the help of the programmable characteristics of the flexible circuit etching and the embedded paper-cut structure. When the artificial muscle tendril contracts, it drives the small arm unit to rotate and lift the load-bearing part. The changes in the number of spiral turns and the pitch cause the inductance to change, and different bending angles correspond to different electrical signals. It can solve the problem that the existing artificial muscles and artificial arms cannot have both movement and perception capabilities at the same time.

This utility model discloses a high-voltage protection device for power input, comprising: a sensor module; the sensor module is used to collect voltage, current and temperature signals of the power supply in real time; this utility model introduces a MOSFET fast cut-off circuit, the MOSFET's operating speed is much higher than that of a mechanical relay, and it quickly cuts off the input power supply when high voltage is detected, protecting the downstream circuit, effectively dealing with transient high voltage impacts and avoiding equipment damage caused by slow response speed; based on the fast cut-off provided by the MOSFET, a varistor is used as an auxiliary protection element to absorb high voltage transient energy, further mitigating the impact of high voltage on downstream equipment. At the same time, varistor one is used to absorb transient high voltage impacts, and varistor two is used for backup protection under continuous high voltage conditions; by integrating a Wi-Fi communication module and an OLED screen, it provides comprehensive real-time monitoring, remote management and fault diagnosis functions, meeting the needs of modern intelligent equipment protection.

The utility model discloses a double-air-cylinder sliding pressing sealing furnace door which comprises a movable door assembly, a guide rail assembly, an outer swing door assembly, a Y-shaped connecting rod with a pin, an outer swing door air cylinder and a movable door air cylinder. The sealing furnace door is provided with double air cylinders, one air cylinder drives the movable door assembly and the outer swing door assembly to slide towards one side on the guide rail, and the other air cylinder drives the outer swing door assembly to be opened outwards or pressed inwards; a pressing ring is installed on the outer swing door assembly, a filler fixing groove is formed in the guide rail assembly, a high-temperature-resistant filler layer used in cooperation with the pressing ring is installed in the groove, the gas sealing effect can be guaranteed after the outer swing door assembly is pressed, the defects in the prior art are overcome, the furnace door and the sealing filler are tightly connected in a pressing mode, the structure is simple, and safety and reliability are achieved. The problem that high-temperature smoke overflows due to the fact that some boiler doors are not tightly sealed is effectively solved, and the boiler door sealing device can be applied to other sealing scenes with similar requirements.

The utility model discloses a welding wire bending mechanism, which belongs to the technical field of welding wire take-up and comprises a bottom plate, a third cylinder, a linear guide rail and a limit block, the third cylinder, the linear guide rail and the limit block are arranged on the bottom plate, a side plate is further arranged on the linear guide rail, and a first cylinder, a second cylinder and a transverse plate are arranged on the side plate. A stop block, a forming block and other assemblies for controlling the forming block to act are arranged on the transverse plate, the third air cylinder is used for driving all the assemblies arranged on the side plate to integrally move horizontally, the second air cylinder is used for driving the stop block and the forming block to move horizontally, and the first air cylinder is matched with the other assemblies for controlling the forming block to act to jointly drive the forming block to rotate. And then the welding wire tail wire bending action is completed in cooperation with the check block. The utility model can ensure that the formed tail screw is firmly fastened, and has the advantages of compact structure, fast action, high reliability and strong executive force.