408results about "Testing vessel construction" patented technology

The invention discloses a multi-sample insulation and voltage resistance test system of an insulation material, the system comprises a protection inductor and a plurality of test units, each test unit comprises a high-voltage relay, a high-voltage electrode, a low-voltage electrode, a detection impedance circuit, a protection resistor, an insulation support and a voltage monitoring unit, the protection inductor is preposed in the system, and the protection resistor is moved backwards; the high-voltage relay obtains power through the protection inductor, the high-voltage electrode is connected with the high-voltage relay, and the insulating material is arranged between the low-voltage electrode and the high-voltage electrode. The high-voltage end of the detection impedance circuit is connected with the low-voltage electrode, and the low-voltage end of the detection impedance circuit is grounded; the voltage monitoring unit is connected with the high-voltage end of the detection impedance circuit to monitor whether the voltage of the high-voltage end exceeds a preset value; and the circuit control end of the voltage monitoring unit is connected with the controlled end of the high-voltage relay, so that the high-voltage relay is in an off state when the voltage of the high-voltage end exceeds a preset value. According to the system, the test efficiency of the withstand voltage breakdown test of the insulating material can be enhanced.

The invention discloses an arc dynamic characteristic regulation and control device and an arc voltage calculation method, and relates to the technical field of physical characteristic measurement. The arc dynamic characteristic regulation and control device comprises a test box, an environment regulation assembly, an electrode assembly, a first driving assembly and a second driving assembly. Wherein the test box is provided with a test cavity; the environment adjusting assembly is communicated with the test cavity so as to adjust the gas environment in the test cavity; the electrode assembly is located in the test cavity and comprises a rod-shaped first electrode and an annular second electrode, the first electrode and the second electrode extend in the vertical direction, and the second electrode is located under the first electrode; the first driving assembly is arranged in the test cavity and is used for driving the first electrode to translate along the radial direction of the second electrode; the second driving assembly is arranged in the test cavity and used for driving the second electrode to ascend and descend in the vertical direction or rotate around the center axis of the second electrode, and the influence of different gas environment conditions on the three-dimensional electric arc generated in the sliding electric contact process can be detected through the regulation and control device.

The invention relates to an experimental device and method for studying the partial discharge aging mechanism of an insulating material, and belongs to the technical field of insulating materials. Comprising a multifunctional closed cavity, a high-voltage circuit, a detection loop and a monitoring sensor, and can accurately control the environment atmosphere, the discharge gap and the discharge voltage, thereby simulating the actual complex operation condition of an insulating material under the high-voltage condition, and monitoring the light intensity, the discharge amount and the discharge energy in the discharge process. The device can obtain solid residues of an insulating material under different discharge conditions and collect gas and liquid products. The analysis method not only considers the partial discharge instantaneous heat effect, but also covers the comprehensive effects of active products, ultraviolet radiation and the like in the partial discharge process, so that the aging mechanism of the insulating material under the partial discharge effect is comprehensively analyzed.

A polyolefin formulation comprising (A) a polyolefin polymer: x weight percent (wt %) of (B) an alkoxyphenol compound of formula (I); and y wt % of (C) a benzophenone compound of formula (II) as described in the specification: wherein y is from 1 to 8 wt %; wherein x is from 0.1 to 3.0 wt %, with the proviso that x is less than 0.5y; and wherein wt % are based on total weight of the polyolefin formulation. Also crosslinked products made therefrom; methods of making and using same; and articles containing same.

The invention relates to the technical field of aircraft thunder and lightning tests and protection, and discloses an aircraft thunder and lightning small test pneumatic discharge device which comprises a pneumatic transmission unit, a thunder and lightning waveform discharge unit and a residual charge discharge unit. The pneumatic transmission unit comprises an air compressor, an air inlet valve, an air storage tank, a pressure regulating valve, an electromagnetic valve driving unit, a main path pneumatic pipeline, a control valve I, a control valve II, a pneumatic cylinder I and a pneumatic cylinder II, and the lightning waveform discharge unit comprises a high-voltage discharge switch I, a high-voltage discharge electrode I and a trigger electrode. The residual charge discharging unit comprises a second high-voltage discharging switch, a first discharging resistor and a second discharging resistor, the discharging device of the mobile aircraft lightning test equipment can achieve high-quality discharging of the maximum 200kV and the maximum 200kA, meanwhile, the safety of an aircraft lightning test can be guaranteed, the designed high-voltage discharging electrode is small in size and convenient to install, and the discharging device of the mobile aircraft lightning test equipment is convenient to use. And interference of a strong electromagnetic environment in the square cabin can be avoided by adopting air pressure transmission.

The invention relates to an unmanned aerial vehicle zero-value insulator live detection device and method, an execution module comprises an AI image recognition unit and a detection probe, the detection probe integrates a voltage sensor and a resistance sensor and supports two modes of live resistance detection and distributed voltage detection, the AI image recognition unit is adjacent to the root of the detection probe, and the AI image recognition unit is adjacent to the root of the detection probe. The image acquisition module is used for acquiring insulator steel cap images and outputting positioning signals; the controller mainboard is electrically connected with the detection probe, the rotating mechanism and the AI image recognition unit through shielding cables, and the controller mainboard is used for receiving a positioning signal of the AI image recognition unit, receiving voltage detection data and / or current detection data transmitted by the detection probe, processing the detection data and obtaining a detection result of the state of the insulator. According to the invention, a dual-mode cooperation mechanism of'distributed voltage preliminary screening + charged resistance verification 'is adopted, and AI automatic positioning and mode automatic switching functions are combined, so that the detection efficiency is remarkably improved.

The invention discloses a test device and method for simulating generation of solid impurities in transformer oil, and relates to the field of power test devices and test mechanisms, the test device comprises a test cavity, and the test cavity is arranged to stimulate generation of the solid impurities and then mix the solid impurities with insulating oil in the test cavity; the filtering mechanism comprises a filter and a receiving container, the receiving container is communicated with the test cavity, the filter is arranged to filter the insulating oil which flows into the receiving container from the test cavity and contains the solid impurities, and the filter is further arranged to collect the solid impurities. According to the invention, the test mechanism and the filtering mechanism are communicated, so that a real solid impurity sample is prepared and is used for the subsequent test research on the influence mechanism of the impurities in the insulating oil, and the purposes of more appropriately simulating the actual form of the impurities in the insulating oil and simulating the actual operation conditions in the research on the impurities in the insulating oil are achieved.

The invention discloses a withstand voltage test device and a withstand voltage test method for an insulating product, and relates to the technical field of withstand voltage tests. The insulation product voltage withstanding test device comprises a workbench, an insulation stand column, a transverse supporting rod, a conductive stand rod, a conductive pressing plate, a box body assembly and a separation support. And when the outer side wall of the heel of the tested insulating boot is pressed on the separation bracket, the steel ball can roll out through the skirt edge opening which is arranged obliquely downwards and falls into the inner cavity of the insulating boot to be tested, and the third conductive liquid at the bottom surface position of the tested insulating boot is adhered to the separation bracket and flows downwards along the separation bracket. The first conductive box body can conduct electricity when being crimped on the conductive pressing plate and is used for forming a loop required by a withstand voltage test of the insulating gloves; the second conductive box body can conduct electricity when being crimped on the conductive pressing plate, and is used for forming a loop required by a withstand voltage test of the insulating boot; and the two wires do not need to be assembled, disassembled and arranged when the two wires are replaced, so that the operation steps of a user are reduced.

The invention discloses a transmission and transformation line insulation test device, comprising a box body, a box door hinged on the upper end of the box body, a leakage current tester arranged on the front side of the bottom wall of the box body, and a connecting mechanism and a fixing mechanism; the connecting mechanism comprises a fixing plate, a plug plate and a socket, the sockets are arranged at the middle of the left and right ends of the box door respectively, the left and right ends of the box body are respectively provided with fixing plates, the upper sides of the ends of the fixing plates close to the inner center of the box body are respectively provided with plug plates, and the ends of the plug plates close to the inner center of the box body are respectively plugged with the laterally adjacent sockets; the fixing mechanism is arranged inside the box body, the transmission and transformation line insulation test device can prevent the equipment inside the box body from being damaged, ensure the performance and life of the transmission and transformation line insulation test device, can make the connection between the wire and the positive electrode interface and the negative electrode interface more stable, and further ensure the test effect of the transmission and transformation line insulation.

The present disclosure provides an insulation detection apparatus and method, and an energy storage apparatus, and relates to the technical field of energy storage safety. The insulation detection apparatus includes: a coupling conductor and a signal acquisition unit, where the coupling conductor and the signal acquisition unit are electrically connected, the coupling conductor and the signal acquisition unit are used to form an insulation detection loop with a device under test, and the signal acquisition unit is further used to detect an electrical signal in the insulation detection loop. The coupling plate and signal acquisition unit used in the present disclosure have a simple structure and low cost. Compared with the existing insulation impedance detection, the present disclosure has a high detection sensitivity and more reliable detection result.

The invention relates to a high-voltage experiment system and method for testing the breakdown voltage of an air gap suspended conductor, and the system comprises a pulse voltage generation device which is used for generating a high voltage required by a test; the first electrode and the second electrode are arranged in a spaced mode, and the suspension conductor is located between the first electrode and the second electrode. A measurement observation device; the system further comprises an insulation discharge cavity, a gas exchange device connected with the insulation discharge cavity and an electrode fixing device arranged in the insulation discharge cavity, and the electrode fixing device comprises a device base, a fixed supporting column, a first sliding rod and a second sliding rod, the first sliding rod and the second sliding rod are slidably connected along the fixed supporting column so as to adjust the distance between the first electrode and the second electrode and the distance between the suspension conductor and the first electrode and the distance between the suspension conductor and the second electrode, and the first electrode and the second electrode are connected to a pulse voltage generating device. Compared with the prior art, the method has the advantages of improving accuracy and safety and the like.

The invention discloses a terahertz reflectance spectrum-based insulating oil micro-water content and aging detection method, device and equipment and a storage medium, and relates to the technical field of dielectric spectroscopy, and the method comprises the following steps: sampling each standard sample to obtain a to-be-detected sample, placing each to-be-detected sample in a sample bearing vessel to obtain an oil film layer, reflecting terahertz wave beams are utilized to irradiate each oil film layer to obtain a terahertz amplitude spectrum and a terahertz phase spectrum, a target three-layer optical model is utilized to perform inversion to obtain a complex dielectric function frequency spectrum, and a preset sub-dielectric model is utilized to fit the complex dielectric function frequency spectrum to obtain a main resonance characteristic and a characteristic parameter set; determining a reference micro-water content based on the main resonance characteristics, determining training data based on the characteristic parameter set, and constructing a target multi-task regression model; and processing the characteristic parameter set by using the model to obtain an initial prediction result and a confidence interval, verifying the prediction result to obtain a target prediction result, and improving the efficiency of detecting the micro-water content and aging of the insulating oil.

The invention provides an AC-DC arc fault detection method based on Rogowski coil magnetic coupling resonance, and the method comprises the steps: enabling a to-be-detected line to pass through a uniformly wound Rogowski coil, and obtaining a specified resonant frequency through adjusting the size of a skeleton structure, the number of turns of a winding, and the capacitance value of a parallel inductor; when the circuit to be detected has an arc fault, the Rogowski coil amplifies the characteristic frequency band signal corresponding to the resonant frequency through magnetic coupling resonance so as to detect the arc fault state.

The invention belongs to the technical field of electrical equipment insulation detection, and particularly relates to a cable insulation wide-temperature-range dielectric loss detection system which comprises a human-computer interaction interface, a main control processor, an acquisition card, a linear high-voltage amplifier, a micro-current preamplifier, a three-electrode test, a gear shifting communication control module, a power module and a signal conditioning module. The main control processor is connected with the power supply module and the acquisition card, the main control processor is connected with the temperature sensor through the signal conditioning module, the acquisition card is connected with the linear high-voltage amplifier and the micro-current pre-amplifier, and the micro-current pre-amplifier is connected with the gear shifting communication control module; the ultrathin thin film resistance type PT100 temperature sensor is combined with a wave-shaped groove isolation structure, so that the heat conduction error of adjacent temperature measurement nodes is effectively reduced. The depth of the wave-shaped groove is 1.5-3 times of the wire diameter of the thermocouple, and the groove is filled with a nanometer aerogel heat insulation material, thereby guaranteeing the independent measurement of a temperature field, and enabling the thermal interference among a plurality of measurement points to be reduced.

The invention discloses a portable lightning arrester performance detection device and a use method thereof, and relates to the field of lightning arrester detection. The portable lightning arrester performance detection device comprises a direct-current high-voltage generator and a box cover arranged on the direct-current high-voltage generator, a flat cable is arranged between the direct-current high-voltage generator and the box cover, two test main lines are embedded in the flat cable, a placement cavity is formed in the box cover, and the test main lines are arranged in the placement cavity. And a plurality of contact type power connection seats are arranged in the placement cavity in parallel based on the test main line, and each contact type power connection seat can be used for placing the lightning arrester main body and is electrically connected with the lightning arrester main body in a contact manner. According to the portable lightning arrester performance detection device, the multi-station parallel contact type power connection seat is arranged in the placement cavity of the box cover, the test branch line is connected with the test main line, a plurality of lightning arrester main bodies can be placed at the same time, a single detection loop is independently controlled through the change-over switch, and batch detection and station switching are achieved.

The invention discloses a partial discharge detection device for power equipment. Comprising a built-in defect simulation electrode used for simulating various types of discharge defects and generating partial discharge, a power frequency AC voltage and test loop, a partial discharge pulse current detection system used for collecting high frequency pulse current signals, and a partial discharge ultrasonic signal detection system used for collecting ultrasonic signals. The partial discharge multispectral signal detection system is used for collecting multiple paths of optical pulse signals; the power frequency AC voltage and test loop is used for outputting power frequency AC voltage to the electrode so as to enable the electrode to generate partial discharge; and the multi-channel data acquisition card is used for accessing the acquired three signals to the computer for waveform display and signal processing. According to the invention, through the multichannel data acquisition card, acoustic, optical and electric signals obtained by synchronously detecting the partial discharge process are accessed to the computer for waveform display and signal processing, so that the characteristics and change rules of the partial discharge signals can be comprehensively known.

The invention provides a long-gap in-oil arc test platform and an energy calculation method, and relates to the technical field of in-oil arc energy calculation, the long-gap in-oil arc test platform comprises a current source loop and a discharge loop, the current source loop is used for providing large current for the discharge loop, and the discharge loop is used for providing large current for the discharge loop. The discharge loop comprises an in-oil arc test tank body, a voltage measuring instrument, a current measuring instrument, a temperature measuring instrument, an image acquisition instrument and N metal probes, wherein N is a positive integer. According to the energy calculation method, short arc injection energy and loss energy are calculated through piecewise linear discretization, and energy calculation errors are reduced; meanwhile, the arc energy space-time distribution characteristics are obtained, and a theoretical basis is provided for research of an arc dynamic breakdown mechanism.

A method for detecting a partial discharge in electric power equipment is disclosed. Two or more narrowband signals corresponding to respective frequency bands of the partial discharge are obtained by two or more receivers, and a temporal coincidence of the two or more narrowband signals is detected, thereby indicating a possible presence of the partial discharge. Then a synchronous recurrence of the partial discharge over a plurality of power cycles is determined, thereby validating the possible presence of the partial discharge. A corresponding system is also provided.

The invention relates to a test system and method for multiple environmental factors of a composite insulator and a medium. According to the invention, based on the environment control parameters corresponding to the target test environment of the composite insulator, through the control module in the test system for the multiple environmental factors of the composite insulator, a negative pressure module, a temperature and humidity module, a salt mist module, a raining module, a light module and a power supply module in the test system for controlling the multiple environmental factors of the composite insulator dynamically simulate various different environmental factors, and provide various climatic environments for the composite insulator in a low-pressure cabin of the test system to carry out related durability aging tests. The influence of various environmental factors on the durability aging test of the composite insulator can be comprehensively considered, and the accuracy and the test efficiency of the durability aging test of the composite insulator can be greatly improved.

The utility model discloses an insulation product insulation degree detector, which is characterized in that the left inner wall of a support plate is provided with a chute, the interior of the chute is movably connected with a control rod, the left end of the control rod is fixedly connected with a bottom plate, the right end of the control rod is fixedly connected with a control box, and the right surface of a shell is fixedly connected with a function box. A telescopic rod is fixedly connected to the left surface of the function box, a clamping plate is fixedly connected to the left end of the telescopic rod, a cover plate is movably connected to the left inner wall of the shell, a signal lamp is fixedly connected to the upper surface of the cover plate, a sensing line is fixedly connected to the lower surface of the cover plate, an induction bead is fixedly connected to the lower end of the sensing line, and the sensing line is electrically connected with the signal lamp. Through the above structure, the power-on detection of insulating products with different shapes and sizes is facilitated, and through the up-down sliding and opening and closing of the bottom plate, sundries appearing in the detection can enter the drawer, and the cleaning is convenient.

The invention discloses an insulating oil insulation strength detection device and a control system, and relates to the technical field of insulating oil insulation strength testing, and the insulating oil insulation strength detection device comprises an oil storage assembly which comprises a sealed oil tank; the detection assembly comprises a detection box, the detection box is connected with the oil outlet of the sealed oil tank through an oil conveying pipe, vertical partition plates are arranged in the detection box, and the detection box is divided into a plurality of detection units with the same size by the vertical partition plates; and an electrode group for testing the insulating strength of the insulating oil is arranged in the detection unit. The device can simulate the electric heating aging and water-containing state of the insulating oil under the actual working condition, ensures the accuracy of the test result, divides the interior of the detection box into a plurality of detection units through the vertical partition plates, realizes multi-station synchronous detection, remarkably improves the detection efficiency and precision, and reduces the detection cost. Independent moisture control and electrode group gap adjustment are carried out in each detection unit, so that the stability and consistency of experimental conditions are ensured.

The utility model discloses a discharge model for simulating bubbles in transformer oil, which relates to the technical field of electrical test, and comprises an oil cylinder, a high-voltage electrode, a low-voltage electrode and a circulating mechanism, a sealing cavity is formed in the oil cylinder, insulating oil is contained in the sealing cavity, and a first through hole and a second through hole are respectively arranged on two opposite sides of the oil cylinder; the high-voltage electrode is located in the sealing cavity and led out of the oil cylinder through a high-voltage lead. The low-voltage electrode is located in the sealing cavity, is spaced from the high-voltage electrode and is led out of the oil cylinder through a low-voltage lead; the circulating mechanism comprises an oil pump and a circulating pipe, two ends of the circulating pipe are respectively communicated with the first through hole and the second through hole to form a circulating loop, the oil pump can pump the insulating oil to circularly flow along the circulating loop, the circulating pipe is communicated with an air source, and the air source can inject bubbles into the insulating oil through the circulating pipe. The discharge model provided by the utility model can more accurately simulate the discharge process of the bubbles under the flowing of the insulating oil, and improves the simulation degree of the test.

The invention relates to a C-GIS circuit breaker automatic partial discharge test system and a test method thereof, the automatic partial discharge test system comprises a test end device and a production line end device, the test end device comprises a shielding room, and a high voltage test device, an automatic commutation device, an automatic wiring device and an automatic opening and closing control device which are arranged in the shielding room; the production line end equipment comprises an automatic roller line, a visual system, a tool positioning module, an aviation plug automatic butt joint tool, a grounding probe butt joint tool and an automatic triggering circuit breaker opening and closing button tool. According to the automatic partial discharge test system, a circuit breaker is automatically conveyed into a shielding room through an automatic roller line, and according to circuit breaker information obtained by scanning a bar code through a visual system, circuit breaker positioning, automatic aviation plug and grounding probe automatic butt joint are achieved through the tool positioning module, the aviation plug automatic butt joint tool and the grounding probe butt joint tool respectively. The whole set of test process can be completed without personnel entering the laboratory, so that the overall test safety is improved.

A system and method of detecting leakage in a pouch-type battery cell includes a press unit configured to position and press the pouch-type battery cell, and a measurement unit configured to measure the insulation resistance of the cell pressed by the press unit.

Disclosed are a method and system for testing high-voltage ride-through of a photovoltaic inverter. The method for testing high-voltage ride-through of a photovoltaic inverter includes: connecting a board-to-board (BTB) circuit to a passive circuit in series, and connecting circuit breakers to the passive circuit to form an inverter test device; connecting one end of the inverter test device to an alternating current power supply, and connecting the other end of the inverter test device to a tested apparatus; and performing testing by adjusting a parameter of the passive circuit and a switching mode of the circuit breakers by means of the BTB circuit. According to the present disclosure, an influence of the device for testing high-voltage ride-through of a photovoltaic inverter on power supply voltage is eliminated, a requirement on supply of reactive power of the power supply is eliminated, applicability is better, and cost is lower.

The utility model relates to a GIS product insulation basin withstand voltage device, comprising a voltage source, a three-way assembly body and two main switches, one interface of the three-way assembly body is connected with the voltage source, the other two interfaces of the three-way assembly body are respectively connected with the input ends of the two main switches through buses, the output ends of the main switches are connected with an assembly switch, and the assembly switch is connected with the three-way assembly body. A fixing tool is installed on the assembly switch, an insulation basin to be tested is detachably installed in the fixing tool, and the insulation basin to be tested is connected with the output end of the assembly switch. According to the utility model, the three-way assembly body is extended to two sides to form two output loops, one output loop is used for carrying out voltage withstanding detection, and the other output loop is used for carrying out test preparation work, so that the time wasted by the preparation work is greatly reduced, and the test efficiency is improved; a plurality of to-be-tested insulation basins are installed on the fixing tool, and each output loop can be connected in series with a plurality of assembly switches for testing, so that the testing efficiency is further improved, and the utilization rate of testing equipment is improved at the same time.

The invention discloses an insulation and voltage resistance test device, and belongs to the technical field of insulation tests. The device comprises a power supply mechanism, a detection mechanism, a plurality of insulation sealing test boxes and a gas storage mechanism. The power supply mechanism is provided with a plurality of output electrodes, the plurality of output electrodes respectively penetrate through different insulation sealing test boxes in a sealing manner, and the output electrodes are used for being connected with an insulation part to be tested; the detection mechanism is provided with a plurality of input electrodes, the plurality of input electrodes respectively penetrate through different insulation sealing test boxes in a sealing manner, and the input electrodes are used for being connected with an insulation part to be detected; the insulation sealing test box is in sealing communication with the gas storage mechanism, and the insulation sealing test box is used for placing a to-be-tested insulation part. According to the invention, the plurality of to-be-tested insulating parts are not mutually influenced, and the condition that the to-be-tested insulating parts face a gas factor in practical application is fully considered, so that the test accuracy and efficiency are improved.

The utility model relates to the technical field of cable protection, in particular to a sealing protection device for partial discharge detection of a high-voltage cable, which comprises a placement plate, a sleeve is arranged at the top of the placement plate, a circular block is fixedly connected to an inner cavity of the sleeve, first grooves are formed in two sides of the circular block, and insulating sleeve blocks are arranged on two sides of the sleeve. The cable fixing device has the advantage of being convenient to disassemble, in the actual using process, through the arrangement of the fixing mechanism, after a cable is placed, the fixing block can make close contact with the insulation sleeve block, so that the sealing performance of the cable in the placing process is improved, and meanwhile due to the fact that the distance of the fixing block can be moved, the cable can be conveniently detached. According to the cable fixing device, through arrangement of the sleeve, cables of different thicknesses can be placed in the sleeve, through arrangement of the first bolt, the effect of fixing a cable core is achieved, the cables are not prone to being disengaged from inner cavities of the first grooves after being fixed, and the stability of the cables during placement is improved.

This utility model provides a transformer partial discharge testing device, mainly relating to the field of transformer technology. The device includes a housing and metal electrodes. The metal electrodes are slidably disposed on the top of the housing. A rectangular cylinder is fixedly disposed on the top of the housing. A support frame is slidably disposed inside the rectangular cylinder. A limiting block is hinged to the outside of the rectangular cylinder, and the limiting block abuts against the side of the support frame. An L-shaped fixing plate is fixedly disposed on the outside of the rectangular cylinder, and a DC solenoid valve is fixedly disposed on the L-shaped fixing plate. The end of the DC solenoid valve abuts against the limiting block. The advantages of this utility model are: after the test is completed or the monitoring system detects an abnormality, the metal electrodes can be quickly and safely separated from the transformer, effectively avoiding the risk of electric shock due to residual charge and greatly ensuring the safety of operators.

The utility model relates to the technical field of measuring devices, and discloses an electric power synchronous measuring comprehensive device, two fixed plates II are fixedly connected to a door plate I, and one side, far away from a rotating rod III, of a rotating rod II is hinged to the middle of the fixed plates II. According to the device, the first small motor is arranged, the output end of the first small motor rotates to drive the rotating shaft to rotate, the rotating shaft drives the third rotating rod to rotate, the third rotating rod drives the second rotating rod to rotate, the second rotating rod drives the second fixing plate to rotate, and the second fixing plate drives the second fixing plate to rotate along the protection box to be opened; a third rotating rod on the other side drives a first rotating rod to rotate, the rotating rods drive a first fixing plate to rotate, and the fixing plate drives a second door plate to rotate along the protection box to be opened, so that the protection box can be opened more quickly, the measuring pen can be adjusted more quickly, the elastic band is bound on the waist by adjusting the width of the elastic band, and a user can carry the device conveniently.