231 results about "Wire loop" patented technology

The invention belongs to the technical field of fault early warning, and discloses a heater fault early warning method and system based on current analysis. Comprising the steps that transient current signals of all heating wire loops in the copper bush heater are collected in real time, harmonic characteristic parameters are extracted, and a dynamic current fingerprint database and a multi-dimensional harmonic characteristic spectrum are generated respectively; dynamically calculating the contact impedance between each heating wire and the copper sleeve groove according to the dynamic current fingerprint database and the multi-dimensional harmonic characteristic spectrum; the current distribution path of each heating wire in the copper sleeve groove is restored in real time, the abnormal contact form of each heating wire is identified, the falling risk probability and falling risk strength of each heating wire are dynamically predicted by fusing the falling precursor signals of each heating wire detected in real time, and a grading early warning strategy report is generated in real time; according to the invention, fault early warning can be converted into preventive maintenance from post-maintenance, the intelligent level of operation and maintenance of the heater is improved, and the continuity and safety of production are guaranteed.

Methods and apparatuses are disclosed for providing pulsed electrical treatment (including high voltage, sub-microsecond pulsed electric energy) to body vessels. The apparatus may include deployable electrodes that conform to transitional surfaces. These apparatuses may include multiple wire loops forming petal-like electrodes configured to expand with an expandable member, such as a balloon.

The present invention relates to a soft robotic arm, and specifically to a variable stiffness soft robotic arm for minimally invasive surgery and a method for using the same. The variable stiffness soft robotic arm for minimally invasive surgery includes a variable stiffness support arm and a sleeve mounted on the variable stiffness support arm. The sleeve includes a bending section and a torsion section. The bending section and the torsion section are respectively wrapped with multiple wire loops and spiral wires. The bending section and the torsion section are respectively provided with at least two or more chambers distributed radially along the variable stiffness support arm and connected to a charging and discharging module. The chambers are charged and discharged with medium to achieve bending and torsion of the robotic arm. The overall variable stiffness support arm, bending section and torsion section of the present invention have the same structure. The type of bending and torsion can be changed by simply changing the wire loops or spiral wires wrapped around the outer wall. This greatly simplifies the structural design and arrangement of the robotic arm, making it convenient to combine different bending sections and torsion sections according to actual needs, and has good compliance.

The invention discloses an automatic winding device for a mutual inductor and a using method thereof, and relates to the technical field of automatic winding. The automatic winding device comprises a workbench, a driving assembly is installed above the workbench, a wire coil support is installed on the side wall of the driving assembly, a wire storage ring is installed outside the wire coil support, and a belt is installed outside a rotating shaft; driving shaft discs are symmetrically installed at the two ends of the belt, limiting frames are rotationally connected to the outer walls of the driving shaft discs, and sliding plate lock catches are symmetrically and slidably connected into the limiting frames, so that the mutual inductor body gradually moves upwards during winding, and tension fluctuation generated by reverse changes of the coil radius of the wire storage ring and the mutual inductor body is effectively dealt with; the tension stability in the winding process is guaranteed, the quality problems of winding loosening, overlapping and the like caused by uneven tension are avoided, the winding quality is improved, the coil radius change of the wire storage ring and the transformer body in the winding process is matched in real time, the dynamic adjustment mode fits the actual winding situation, and the defect that traditional fixed position winding cannot adapt to the radius change is overcome.

The invention relates to the technical field of electric power, in particular to a cable nondestructive testing method which comprises the following steps: acquiring corresponding calibration parameters from a database according to the model of a to-be-tested cable, and calculating the total length and fault position of the to-be-tested cable at the near end of the to-be-tested cable by adopting a time domain reflection method; at the tail end of the cable to be detected, at the tail end, at least two core wires are short-circuited, a four-wire detection method is adopted to measure the direct-current resistance of a core wire loop at the near end, and standard temperature correction is conducted on the direct-current resistance of a single core wire; the resistivity to be measured is calculated by using the total length of the cable to be measured, the actual cross sectional area of the core wire and the direct current resistance of the single core wire at the standard temperature, and whether the actual core wire material of the cable to be measured is qualified is analyzed according to the resistivity to be measured and a resistivity threshold value set based on the calibrated core wire material. And early warning is carried out based on a core wire material analysis result and a fault position. According to the method, the cable length, the fault position and the core wire material qualification can be quickly, nondestructively and accurately detected on site.

An elevator system has an elevator controller system to control movement of an elevator car between a predetermined number of floors of a building, and an elevator operating panel communicatively coupled via a multicore cable to the elevator controller system. The elevator operating panel includes at least one push-button having an open state and a closed state, wherein the push-button is configured to close in the closed state a wire loop of the multicore cable, and wherein the push-button is configured to be in the closed state when a user presses the push-button to enter an elevator call. In addition, the elevator system includes an ancillary operating panel arranged next to the elevator operating panel and having a proximity sensor for touchless entry of an elevator call.

The present invention discloses a tool restriction mechanism and a restriction system composed thereof, including a restriction mechanism. The automatic wire winder is installed on the inner wall of the placement bin. The automatic wire winder includes a connecting rope, and a fixing ring is arranged at the end of the connecting rope; a connecting ring and an anti-metal identity tag are arranged on the connecting rope between the fixing ring and the automatic wire winder; in the restriction system with the tool restriction mechanism, a placement bin is arranged inside the outer box body, and a tool restriction mechanism, i.e., a restriction mechanism, is arranged in the placement bin. The restriction system of the present invention can clearly measure the usage data of each tool corresponding to each person, and the restriction mechanism can prevent it from being taken away by force. The wire loop in the connecting rope will trigger an alarm; to open the blocking plate, the user needs to identify with the corresponding identity recognition card or complete the verification through the fingerprint recognition device, realizing the recording of the usage situation of the user; it is more convenient and safe, and the recorded information will not be lost or incorrect.

The invention relates to the technical field of cable production, and discloses a cable wrapping machine loss-resistant positioning adjusting device which comprises a wrapping structure and a coil holder which are fixed to the left side and the right side of a rack respectively, a driving pipe is rotationally arranged in a wrapping machine body of the wrapping structure, the right end of the driving pipe is connected with a wrapping head, a guide rod and a wire guide wheel are installed on the surface of the wrapping head, and a pulling ball is arranged on a wheel shaft of the wire guide wheel. A middle hole line pipe inserted in the driving pipe is movably connected with a movable open ball of the wrapping head inner constraint pipe through a ball seat; a wire sleeving ring is arranged at the right end of the restraining pipe, a rolling spring rod is arranged in the wire sleeving ring, the side face is connected with a lever, and the lever is rotationally connected with the supporting body through a tilting ball body and provided with a reset spring and a top ball; when the cable deviates, the device can reduce the deviation of the cable by using structures such as the constraint pipe and the like, thereby reducing the abrasion and vibration of equipment; meanwhile, the pull rod, the pull ball and other structures can adjust the position of the wire guide wheel, the wrapping tape is kept tensioned, abrasion to the wire guide wheel is reduced, and the abrasion resistance of the wire guide wheel is improved.

The present invention relates to a dual-interface smart card and / or payment card comprising a first antenna, a second antenna, a wire loop, various inlays, one or more metal layers, one or more printed PVC layers, and optionally one or more contact, non-contact, and / or integrated circuit chips. The first and second antennas are components of an antenna segment inlay designed to fit tightly within the outline of one or more metal layers.

The present invention discloses a method and device for preparing a micro-hook with a fixed function sling, which belongs to the field of medical sling manufacturing. The method and device for preparing a micro-hook with a fixed function sling of the present invention have a process flow including wire loop interruption, surface melt-blowing and cooling; the preparation device includes a wire loop interruption device, a melt-blowing device, a cooling device, a mesh unwinding device and a mesh winding device. The present invention organically combines wire loop interruption and melt-blowing processes, forming irregular fluff on the short burrs formed by wire loop interruption and the surface of the mesh, thereby increasing the friction of the mesh, improving the gripping force of the sling made of the mesh in the body, reducing the risk of the sling sliding on the tissue, and saving surgical time; in addition, due to the presence of melt-blown fluff, the requirements for the shape and size of the barbs on the short burrs are reduced, which can improve the efficiency and process flexibility of the wire loop interruption process, thereby helping to improve the overall production efficiency of the sling.

The embodiment of the application provides a control method and device of a rod wire loop device and a storage medium, the control method comprises the following steps: determining a loop starting time of the loop device according to a rolling piece running speed of a target rolling piece and a downstream rack biting time; determining a real-time loop height value according to the loop starting time, a loop starting initial height, a steady-state target loop height and a ramp rising time, and controlling the loop device to start the loop according to the real-time loop height value; acquiring a real loop height value of the loop device, and correcting an upstream rack running speed according to the real loop height value and the real-time loop height value; and when a tail of the rolling piece leaves the upstream rack, the loop device is controlled to fall back according to a tail loop closing target height. The method realizes adaptive control of the rod wire loop.

The present application relates to a method for tying a connecting wire loop in a wire anchor and a wire anchor. The method for tying a connecting wire loop in a wire anchor specifically includes the following steps: the two ends of a long wire are respectively a braided end A and a braided end B, the braided end A is wrapped around itself to form a first coil, and the braided end B passes through the first coil to form a second coil; the braided end A is tightened to form a first knot, and the second coil forms a first loop; the first knot passes through the head and tail of the anchor body, and one end of the suture passes through the first loop; the braided end B is wrapped around the first loop and then around itself to form a third coil; the braided end B is tightened to form a second knot; the suture is pulled in a direction away from the first loop until the first knot and the second knot are located in the wire-holding hole and pressed against the bottom of the wire-holding hole. The present application can be suspended in the wire-holding hole by the first knot and the second knot, so that the first knot and the second knot will not be separated from the anchor body due to external force, thus meeting the requirements of biomechanics.

1. Name of the Design Product: Notebook (Zhimum Pig-shaped Insert Double-wire Loop Notebook). 2. Use of the Design Product: Writing and recording text. 3. Design Key Points of the Design Product: The combination of shape and pattern. 4. Picture or Photograph that Best Illustrates the Design Key Points: Perspective view.

The invention relates to a wireless anti-pinch control method for a sliding door, which is characterized in that when a movable sash slides along a first direction, if a sash frame of the movable sash is externally touched, the touch force can be applied to an anti-pinch adhesive tape; and the anti-pinch rubber strip is extruded to deform, so that the originally disconnected pressure-sensitive sensors are in contact with each other, and a conductive wire loop is formed. And a wireless transmitting module is started to send a signal to a wireless receiving module on the fixed frame, so that the movable sash is controlled to execute an anti-pinch instruction, external touch of the movable sash in the closing process is detected in time, and an anti-pinch action is quickly triggered. The clamping injury accident caused by the fact that a user (especially a child or a pet) is clamped between the door leaf and the door frame is effectively avoided, and the use safety of the sliding door is greatly improved. Meanwhile, a wireless communication mode is adopted, so that the friction problem caused by line connection between the movable sash and the fixed frame is avoided, and the risk of anti-pinch control failure caused by line damage is greatly reduced.

The present technology provides systems, devices, and methods for forming blebs to treat ocular hypertension or glaucoma. In some embodiments, a minimally invasive bleb formation device comprises an introducer sheath having a lumen extending longitudinally therethrough. The lumen has a distal end aperture insertable adjacent to a target tissue. The device further includes a wire positionable within the lumen of the introducer sheath. The wire has a first end portion, a second end portion, and an intermediate region between the first end portion and the second end portion. At least a segment of the intermediate portion is configured to extend through the distal end aperture to form a wire loop. The wire loop is moveable between a plurality of positions and is configured to disrupt and cauterize the target tissue.

The utility model discloses a heat preservation barrel soft felt cutting machine which comprises a connecting beam, a cutting device and a cutting device. The connecting beam comprises a first connecting beam body and a second connecting beam body connected to the first connecting beam body. The supporting assembly comprises a first supporting column, a second supporting column and a third supporting column, the first supporting column and the second supporting column are arranged on the first connecting beam, the third supporting column is arranged on the second connecting beam, and the first supporting column, the second supporting column and the third supporting column comprise connecting sections, vertical limiting sections and transverse limiting sections which are sequentially arranged; the diameter of the vertical limiting section is larger than that of the transverse limiting section; the cutting assembly comprises a diamond coil used for cutting the soft felt, a roller assembly used for winding the diamond coil and a driving assembly used for driving the roller assembly to rotate so as to drive the diamond coil to cut the soft felt. The whole cutting machine is fixed to the opening of the heat preservation barrel through the connecting beam and the supporting assembly, and redundant felt above the opening of the heat preservation barrel can be cut by driving the diamond coil to rotate at a high speed through the driving assembly.

This utility model discloses an easily assembled lighting component, comprising: a tubular tree trunk body, with a plurality of downwardly inclined insertion holes penetrating the circumferential outer wall and / or the top of the tree trunk body, the axial direction of the insertion holes forming an acute angle with the axial direction of the tree trunk body; a complete wire loop communicating with its inner cavity at the bottom end of the tree trunk body; at least one branch body, one end of which is provided with a plug end, the insertion holes and the plug end being plugged in; a string of lights is wound around the outer wall of the branch body, the string of lights passing through the corresponding insertion holes and sequentially passing through the interior of the tree trunk body and the interior of the complete wire loop. This easily assembled lighting component not only improves the decorative and aesthetic appeal of the lighting fixture but also increases structural flexibility and ease of assembly, making the installation and maintenance of the lighting component more convenient.

The invention relates to a smart card and / or payment card with dual interfaces. The smart card and / or payment card optionally comprises one or more of a first antenna, a second antenna, a wire loop, various inserts, one or more metal layers, one or more printed PVC layers and one or more contact, non-contact and / or integrated circuit chips. The first antenna and the second antenna are part of an antenna section insert designed to fit closely into the profile of the one or more metal layers.

The utility model relates to a fiber distribution box, in particular to a mini fiber distribution box supporting quick connection and rubber-insulated wire head cable outgoing, which comprises an outer shell provided with a cable inlet and a cable outlet for a rubber-insulated wire optical cable to be inserted and led out; the adaptive connector is installed in the outer shell, two sets of connecting positions which are symmetrically arranged are formed on the adaptive connector, and the two sets of connecting positions directly face the cable inlet and the cable outlet respectively; the plurality of wire rings are installed in the outer shell, the tail fiber connected with the connection position of the adaptive connector is wound around the wire rings and then enters the welding clamping seat arranged at the side end of the adaptive connector for welding, and the tail fiber connected with the connection position of the adaptive connector is wound around the wire rings and then enters the welding clamping seat arranged at the side end of the adaptive connector for welding. The tail fiber is wound on the wire ring, so that the curvature radius can be effectively increased, the tail fiber is not easy to break, and meanwhile, the volume occupation of the fiber distribution box is reduced to a certain extent.

The invention relates to the technical field of spinning equipment, and particularly discloses a spinning device and a spinning method for improving resultant yarn quality, the spinning device comprises a cabinet, a drafting mechanism, a yarn guide mechanism and a winding assembly; an upper supporting table and a lower supporting table are fixedly arranged on the inner side of the cabinet, the drafting mechanism is arranged on the top of the cabinet, the yarn guiding mechanism comprises two rotary drums A, the rotary drums A are rotationally arranged at the upper end of the upper supporting table, supports are fixedly arranged on the outer sides of the rotary drums A, and yarn rings are arranged on the tops of the supports. The power assembly controls the rotating drum A and the rotating drum B to rotate, yarn is wound on the rotating polygonal winding shafts according to a specific track, in the rotating process of the rotating drum A and the rotating drum B, the two polygonal winding shafts can be driven to do reciprocating lifting motion, and the yarn is evenly distributed in the center axis direction of the polygonal winding shafts in the winding process. The yarn is evenly and tightly wound on the winding mechanism, the problems that the yarn is loose or overlapped or wound irregularly and the like are avoided, and the yarn forming quality is improved.

The utility model discloses a tight cotton yarn breakage alarm device, and particularly relates to the technical field of yarn breakage alarm, the tight cotton yarn breakage alarm device mainly comprises a sleeve column, the top end of the outer wall of the sleeve column is fixedly connected with a plurality of positioning slip rings, and the positioning slip rings are internally provided with synchronous alarm components; the synchronous alarm assembly comprises a sliding column installed in the positioning sliding ring, one side of the sliding column is fixedly connected with a sliding strip, the sliding strip and the sliding column are both in sliding connection with the inner wall of the positioning sliding ring, and the sliding column and the sliding strip are both in sliding connection with the inner wall of the sleeve column. Wire rings are welded to the top ends of the sliding columns. The line ring drives the sliding column and the sliding strip to move downwards synchronously, the sliding column and the sliding strip move downwards and slide along the inner wall of the lantern ring, a gap is formed between the connecting block and the pressing strip, when one cotton yarn is broken, the line ring is under the action of resilience force of the spring, the pressing strip is extruded on the button switch, and the alarm lamp gives an alarm for prompting. And batch yarn breakage alarm is synchronously realized for a plurality of pieces of tight cotton yarn.

This utility model belongs to the field of medical devices and discloses an endotracheal tube with automatic feedback of pressure deformation and its monitoring and early warning device, including a cannula with openings at both ends; the cannula is made of elastic material; a reinforcing layer made of metal wire is embedded in the wall of the cannula; the reinforcing layer includes multiple wire loops and multiple wire strips, the wire loops are all placed coaxially with the cannula, the multiple wire loops are arranged along the axial direction of the cannula, the multiple wire strips are all placed coaxially with the cannula, and the multiple wire strips are evenly distributed in a ring around the central axis of the cannula, and each wire strip is fixed to each wire loop in sequence; a monitoring sensor is installed at each intersection node of the wire strip and the wire loop, and the monitoring sensor is used to monitor the pressure deformation signal of the cannula; the monitoring sensor includes a position sensor or a pressure sensor; it solves the problem in the prior art that the endotracheal tube lacks real-time deformation monitoring means, resulting in difficulty in timely detection of collapse.

This invention relates to a movable thread cutter with a sweeping function, a thread cutting mechanism, and a sewing machine for thread cutting operations in a sewing machine. The movable thread cutter has a thread separating tip for insertion into a thread loop. The right side of the thread separating tip has a thread separating side. The movable thread cutter can move relative to the thread cutter until the two engage to cut the thread or separate. The thread separating tip also has a sweeping structure, which includes a sweeping hole and a sweeping opening connecting the sweeping hole and the thread separating side. The sweeping hole forms a sweeping stop on at least one side of the sweeping opening.

The application discloses a control method and device for double-vehicle connection of straddle-type monorail vehicles, and is applied to the field of vehicle control. The method provided by the application is applied to a slave vehicle which has a communication line and a hard-wire loop with a driver's cab controller and a central control unit of a master vehicle, and the connection jumper line between the slave vehicle and the master vehicle comprises a communication line, an emergency braking hard-wire loop and other hard-wire loops for controlling straddle-type monorail vehicles. The method comprises the following steps: acquiring a communication state between the master vehicle and the slave vehicle; if the communication state is normal, receiving a control instruction transmitted by the master vehicle through network communication according to a network control mode, and executing the control instruction; and if the communication state is abnormal, switching the network control mode to a hard-wire control mode, receiving a control instruction transmitted by the master vehicle through a hard-wire loop according to the hard-wire control mode, and executing the control instruction. The network control mode and the hard-wire control mode can meet the demand of different communication states between the master vehicle and the slave vehicle, and can avoid serious consequences caused by communication abnormalities.

The application discloses an automatic winding device for a mutual inductor and a use method thereof, and relates to the technical field of automatic winding, which comprises a workbench, a driving assembly is installed above the workbench, a wire reel support is installed on the side wall of the driving assembly, a wire storage ring is installed outside the wire reel support, a rotating shaft is installed outside the wire reel support, a belt is installed on the rotating shaft, driving shaft discs are symmetrically installed at both ends of the belt, a limiting frame is rotationally connected to the outer wall of the driving shaft disc, slide plate locks are symmetrically and slidably connected to the inside of the limiting frame, the mutual inductor body is gradually moved upwards during winding, the tension fluctuation caused by the reverse change of the coil radius of the wire storage ring and the mutual inductor body is effectively coped with, the tension is stable during winding, the quality problems such as loose winding and overlapping caused by uneven tension are avoided, the winding quality is improved, and the change of the coil radius of the wire storage ring and the mutual inductor body in the winding process is matched in real time, the dynamic adjustment mode is in line with the actual winding, and the defect that the traditional fixed-position winding cannot adapt to the change of the radius is made up.

The invention relates to the technical field of automobile wire harness cost analysis, in particular to an automobile wire harness cost estimation method and device, and the method comprises the steps: obtaining a whole automobile wire harness topological structure in an automobile project planning stage or an automobile product definition stage; determining segmentation cost information of a corresponding wire harness application area according to the whole vehicle wire harness topological structure; and based on the wire harness application area where the wire loop of each wire harness is located and the corresponding segmentation cost information, estimating the automobile wire harness cost including at least one of the processing cost, the loop material cost and the cost average cost of the wire harness supplier. Therefore, the problem that according to a wire harness cost estimation method in the related technology, the wire harness cost cannot be quickly, efficiently and reasonably analyzed and estimated according to an implementation scheme of a whole vehicle function requirement in the stage that wire harness drawings such as project planning and product definition are not developed yet and specific material information of wire harness composition is not given yet is solved; and the analysis and estimation requirements of the initial-stage wire harness cost of the project are difficult to meet.

An arch bar system for maxillomandibular fixation is disclosed. A contourable, trim-to-fit bar includes a series of elongated oval apertures oriented substantially parallel to the bar axis. The apertures guide wire, coated suture, or other ligatures at varied approach angles, limit vertical clearance to resist slippage, and cooperate with intervening structural columns to distribute loads while the bar is cinched to teeth. Low-profile depending attachment features—cleats and / or J-hooks—project below the lower edge to receive interarch wire loops, guiding elastics, or other connectors. All patient-facing edges and transitions are radiused to minimize gingival and mucosal trauma. Bars may be metal or engineered polymer and segmentable for partial-arch use. Methods include threading ligatures through successive apertures to secure each bar and joining opposing bars at the depending features. Kits include paired bars, ligatures, interarch connectors, and tools.

The application provides an electric driving stitch mechanism and method of a sewing machine, which is applied to the sewing machine and comprises an upper shaft motor, an upper shaft, a needle bar, a needle bar crank, a needle bar lifting connecting assembly, a needle, a lower shaft motor, a lower shaft, a curved needle and a curved needle driving assembly. The upper shaft motor is arranged on a frame of the sewing machine, and the output end of the upper shaft motor is connected with the upper shaft. The needle bar crank is arranged at the end of the upper shaft far from the upper shaft motor. In the application, the vertical movement of the needle is driven by the upper shaft motor, and the horizontal movement of the curved needle is driven by the lower shaft motor. When the thread is hooked, the curved needle first passes through the short needle thread loop, and then the upper shaft motor reduces the lifting speed of the needle, so that the needle can normally hook the thread even if the height of the needle is increased, the needle can be higher than that of a conventional machine when it is lowered to the lowest point, the sewing material can be prevented from being damaged by the needle handle, the needle can be higher than that of a conventional machine when it is lifted to the highest point, and thicker sewing material can be sewn.

The present invention discloses a welding device for a grommet of a hardware rigging, which relates to the technical field of welding equipment and includes a ground-touching mounting plate; two L-shaped support plates are symmetrically welded to the top end of the ground-touching mounting plate, and a waist-shaped support frame is horizontally welded to the top ends of the two L-shaped support plates. The waist-shaped support frame, the two L-shaped support plates and the ground-touching mounting plate are jointly welded to form the main body framework of the equipment; two positioning sleeves are symmetrically welded in the spaces at the left and right ends of the waist-shaped support frame, two sprockets are symmetrically rotatably mounted on the two positioning sleeves, and a chain is tensioned and mounted between the two sprockets; two groups of four threaded shafts are fixedly mounted on the chain, and a limit baffle is welded and fixed to the leading end of each of the four threaded shafts. The present invention can enable the welding gun to automatically switch the welding posture following the feeding and conveying of the cable chain, solving the problem that it is necessary to additionally support a posture adjustment motor and an automatic start-stop controller of the motor for the welding gun, which is not conducive to the equipment reducing energy consumption and cost.

The invention provides a distribution box line monitoring method and device, and belongs to the technical field of distribution box monitoring, and the method comprises the steps: firstly, providing an excitation voltage for a ground wire loop, so as to enable the ground wire loop to generate a loop current; wherein the grounding wire loop comprises a first connecting wire and a second connecting wire which are used for connecting a first grounding end outside the distribution box and a second grounding end inside the distribution box, and the first connecting wire and the second connecting wire form a closed loop; then, sampling the loop current to obtain a loop sampling signal; and finally, obtaining a line monitoring result of the distribution box according to the loop sampling signal. The grounding wire loop is a closed loop connected between the first grounding end and the second grounding end, so that even if the second grounding end is not directly grounded, the grounding reliability of the second grounding end in the distribution box can be indirectly reflected through the resistance condition on the grounding wire loop, and the grounding reliability of the second grounding end in the distribution box can be indirectly reflected for the second grounding end which is not directly grounded. And the grounding condition can be monitored.