31results about How to "Accurate measurement data" patented technology

The application relates to the field of metal part processing devices, in particular to an ultrasonic rolling device for metal parts. The device comprises a connecting plate, a rotating seat is arranged at the upper end of the connecting plate, an electric telescopic rod is fixed at one side of the lower end of the connecting plate, an ultrasonic roller is fixed at the other side of the lower end of the connecting plate, a fixed plate is fixed on the telescopic rod of the electric telescopic rod, a plurality of inclined movable rods are hingedly connected to the lower end of the fixed plate, the plurality of inclined movable rods are arranged according to the circumferential distribution of the axis of the fixed plate, and two adjacent movable rods are connected through a distance measuring assembly. The distance measuring assembly is used for measuring the distance between the two movable rods connected thereto. When the levelness of the workpiece is measured, the plurality of movable rods are controlled to descend simultaneously through the electric telescopic rod, the lower ends of the plurality of movable rods are in contact with the upper end of the workpiece, the distance between the movable rods is measured through the distance measuring assembly, whether the workpiece is vertical is determined according to the measured data, and therefore the efficiency of measuring the levelness of the workpiece is high.

The utility model provides a kind of for luggage's weighing device, belong to luggage technical field.It solves the existing travel to the luggage weight weighing troublesome problem.The utility model includes box, base assembly, lock.Locker is fixedly connected on the box, and four base assemblies are installed on the other side symmetrical to the box.The lock includes lock shell, display, button, combination lock component.The base assembly includes shell, cover plate and support leg, and the shell is divided into hard shell part and soft shell part of stretchable bending.The shell inner wall has connecting column and protruding portion.The shell inside is equipped with cavity, from top to bottom respectively there is cover plate, gravity sensor, contact piece and support leg, and the cover plate is connected with gravity sensor below.The gravity sensor below has contact piece, and the contact piece is connected with support leg.The lower part of support leg is connected with shell bottom, and the contact piece and support leg can move up and down in shell.The utility model has the advantages of high practicality, high precision.

The invention relates to the technical field of mother and baby products, and particularly provides a control method of a milk shaking device and the milk shaking device. The problem that the milk shaking effect is poor due to the fact that the milk shaking rotating speed of an existing milk shaking device is not accurately controlled is solved. Therefore, the milk shaking device has a plurality of milk shaking modes with different rotating speeds, and the control method comprises the steps that the milk amount in a milk bottle is obtained; determining a milk shaking mode of the milk shaker according to the milk amount; according to the milk shaking device, the milk shaking modes with the different rotating speeds are set, the milk amount in the milk bottle is obtained, and therefore the corresponding milk shaking modes and the milk shaking rotating speeds can be matched according to the different milk amounts, and the situation that due to the fact that the milk shaking rotating speed is too low, milk is not uniform, and the milk shaking speed is too high is avoided. The problems of milk foaming, nutrition loss and the like caused by too high milk shaking rotating speed are solved, so that the milk can be uniformly mixed, nutritional ingredients are locked, and the use experience of a user is improved.

A measuring tool comprises a measuring point A, a measuring point B and a measuring point C. The three points cooperate to measure the horizontal or inclined angle of the unmanned aerial vehicle and adjust the height of the measuring point A, so that the measurement of the gravity center position at different inclined angles can be realized, and based on the numerical values, the measurement accuracy of the unmanned aerial vehicle is improved. The inclination angle sensor is installed on the measurement tool and used for measuring the inclination angle of the unmanned aerial vehicle and providing inclination angle data for calculation of the gravity center position of the unmanned aerial vehicle, and then the gravity center measurement result of the unmanned aerial vehicle is obtained through subsequent calculation. The inclination angle of the unmanned aerial vehicle can be autonomously controlled, the inclination angle is relatively small, the unmanned aerial vehicle with a large size can be measured, the measurement process is relatively simple, and the three-point suspension measurement method adopts a hoisting measurement mode, so that the hoisting frame can move freely, the influence of lateral force is relatively small, and the measurement result of the gravity center position of the unmanned aerial vehicle is more accurate.

The invention aims at providing surveying equipment for hydrogeological survey, and relates to the technical field of measuring equipment, the surveying equipment comprises an electrode bar assembly, the electrode bar assembly comprises a pole, a pole cap and a drilling rod, and the electrode bar assembly is used for being connected with soil and measuring the resistivity of the soil; the driving assembly comprises a battery pack, a threaded sleeve, a shaft sleeve and a motor and is used for driving the electrode bar assembly to insert underground; the compaction assembly comprises a pressing rod, a first pressing plate and a second pressing plate, and it can be guaranteed that soil is attached to the electrode bar assembly. And the straightening assembly comprises a third mounting plate, a laser range finder, a measuring plate, a lens and a developing plate, plays an auxiliary role in insertion of the electrode bar assembly, ensures that the electrode bar assembly is linearly distributed, and solves the problems that the measurement position is deviated and the accuracy and the reliability of measurement data are influenced due to the fact that the electrode bar is easily inclined when being manually inserted in the prior art.

The utility model discloses a kind of anchor rod cable stress sensors of being convenient for connection and fixed, including sensor body and bottom mat, the outside middle part of sensor body is equipped with transmission line, bottom mat is installed below sensor body, and high-strength shaft is installed in the left side of bottom mat, the below high-strength shaft is equipped with rotary plate, and rotary plate and high-strength shaft are rotationally connected.This kind of anchor rod cable stress sensor of being convenient for connection and fixed, compared with the existing anchor rod cable stress sensor, four groups of positioning components are convenient for the installation and fixation of bottom mat and top mat, and the axis is aligned, rotating stud drives two slide rails to slide in rotary plate, wedge block moves and jolts rotary plate, rotary plate changes angle by high-strength shaft rotation, so that the axis of sensor body and anchor rod axis are aligned, the data measured by sensor body is more accurate, two nuts are clamped by gasket at the junction of stud and slide rail, prevent loosening and cause wedge block to move and change angle, installation is more stable.

The utility model discloses a motor electromagnetic force measuring device concretely relates to motor electromagnetic force measuring technical field, including work table, the work table top is equipped with the detection piece for measuring motor electromagnetic force, and detection piece shifts up and down through drive piece, the detection piece outside is equipped with the auxiliary part for reinforcing the measurement accuracy, the auxiliary part includes the pure copper bellows of being equipped at the work table top, and the pure copper bellows top end and bottom respectively install the link ring and fixed ring. The utility model discloses through the elasticity of pure copper bellows, so that pure copper bellows can always be fitted in the motor outside, and then it is convenient to by pure copper bellows to the electromagnetic interference of external environment carries out reflection and absorption, so it can ensure that the measurement data is more accurate, and by the guidance of two first telescopic rods of inside and outside setting, can avoid the pure copper bellows to appear skew and distortion situation, thereby guarantee the service performance of pure copper bellows.

This application relates to a method, apparatus, and measurement system for dynamic measurement of assembly data. The measurement system includes a moving crossbeam and multiple calibration targets, with a 3D scanner and a laser tracker mounted on the moving crossbeam. The method includes: controlling the moving crossbeam to move to a measurement pose; positioning multiple calibration targets using the laser tracker to construct a geodetic coordinate system and tracking and determining the real-time pose of the 3D scanner in the geodetic coordinate system; controlling the 3D scanner to move and scan to obtain reference point cloud data and key area point cloud data of the assembly workpiece, and establishing the point cloud correlation between the two, establishing a workpiece coordinate system based on the reference point cloud data; based on the workpiece coordinate system, real-time pose, and point cloud correlation, mapping the key area point cloud data to the geodetic coordinate system and performing error correction; and generating an assembly deviation map based on the deviation between the corrected actual measurement data and the expected measurement data. This method can improve the cycle time efficiency and assembly accuracy pass rate of a pulsed assembly production line.

The utility model discloses a side-mounted bearing bush temperature sensor, and aims to solve the problem that the accuracy of a temperature detection result is affected due to the fact that the detection result is deviated from the actual temperature in the traditional bearing bush temperature detection. The side-mounted bearing bush temperature sensor comprises a probe and a fixing plate, the probe is connected with the fixing plate, the fixing plate is fixedly connected with the side edge of a bearing bush, an oil inlet is formed in the side edge of the bearing bush, the probe is located in the oil inlet of the bearing bush, and the end face of the probe is arranged on the upstream of the oil inlet. The probe of the sensor is installed on the side face of the bearing bush and arranged at the position of the oil inlet, the probe can directly make contact with oil flowing into the bearing bush from the outer side of the bearing bush along the oil inlet, then temperature interference after oil mixing or heat dissipation is avoided, and measured data are more accurate. The fixed plate is connected with the side edge of the bearing bush, so that the sensor is kept at a stable position and a stable working environment during running of the bearing bush, and the accuracy of temperature measurement data is further improved.

The present application relates to a kind of tool measuring method and system based on UG / NX software, based on UG / NX software, comprising: the tool model created after using reverse scanning device to scan cutting tool is obtained;Obtain the key features of the cutting tool set;Obtain the key parameters of the cutting tool set;Based on the tool model, key features and key parameters, using static installation size automatic measurement algorithm and / or static non-installation size automatic measurement algorithm, the automatic measurement calculation of static installation geometric dimension and / or static non-installation geometric dimension of cutting tool is carried out on the tool model;Output the measurement data calculated by static installation size automatic measurement algorithm and / or static non-installation size automatic measurement algorithm.The present application combines reverse scanning and UG / NX software, can greatly improve the measurement accuracy and measurement efficiency of tool, improve product quality, bring more economic benefits for enterprise.

The invention provides a radar ranging method and device, electronic equipment and a computer readable storage medium, and relates to the technical field of radars, and the method comprises the steps: obtaining a plurality of measurement data sets obtained through the sampling of at least one echo signal in a measurement period based on a plurality of threshold values; wherein the echo signal is sampled based on a threshold value to obtain a measurement data set, and each measurement data set comprises at least one piece of measurement data; determining M pieces of alternative data and N pieces of auxiliary data in the plurality of measurement data sets, and obtaining the total composite degree of each piece of alternative data; wherein M and N are positive integers, and the sum of M and N is equal to the total number of measurement data contained in the plurality of measurement data sets; determining target data from the M pieces of alternative data according to the total composite degree; and determining a measurement distance according to the target data. According to the invention, the dynamic range of the laser radar system can be improved, so that the measurement precision of the laser radar is improved, and the close-range detection blind area of the laser radar is shortened.

The application provides a kind of based on binocular vision's electric arc additive deposition size in-situ acquisition system and method, comprising: electric arc additive manufacturing system, image acquisition and processing system, wherein the electric arc additive manufacturing system is configured with robot, intelligent welding machine, wire feeder, welding torch, welding protection gas bottle, the image acquisition and processing system is configured with binocular camera, computer;The binocular camera is installed on the welding torch, for collecting the deposited pass image in deposition process, and the deposited pass image collected is sent to computer for processing, obtains the overall size of current deposition piece.The application can directly monitor the deposition size in deposition process, obtain the size of deposition piece, with good synchronism, not by large workpiece size limitation advantage.And not by size restriction, can realize the size in-situ monitoring in the process of large piece electric arc additive manufacturing, measurement data is more accurate.

The utility model discloses a windscreen wiper rubber strip friction force testing machine, and relates to the technical field of windscreen wiper rubber strips. The problem that a device in the prior art is inaccurate in testing the friction force of the windscreen wiper rubber strip is solved. Comprising a support, the support is provided with a motor, a speed reducer, a torque sensor, a rotating shaft and a glass cylinder which are assembled, and the motor works to drive the speed reducer to work, drive the torque sensor to work, drive the rotating shaft to rotate and drive the glass cylinder to rotate. The windscreen wiper rubber strip press-fitting adjusting mechanism is provided with a pressure sensor and a windscreen wiper rubber strip clamping piece, and the windscreen wiper rubber strip clamping piece is arranged opposite to the outer side wall of the glass cylinder. The windscreen wiper rubber strip friction force testing machine is used for testing the friction force of a windscreen wiper rubber strip, the friction force is measured through a dynamic torque difference method, inertial interference is eliminated, measured data are accurate, and a windscreen wiper rubber strip friction coefficient curve changing along with the change of the pressure of the windscreen wiper rubber strip pressing on a glass cylinder is generated; and the accuracy of the wiper rubber strip friction force test is improved.

The application discloses a kind of multi-loop power distribution cable overlapping state electromagnetic distribution characteristic simulation device and method, including power frequency power supply, phase modulation unit, flow unit, high-frequency signal coupling unit, multiple cable sections, multiple cable overlapping units, control unit and electromagnetic signal measurement unit, modular design is adopted, only by changing the position of cable connection plug can simultaneously simulate the overlapping state of multiple different cables, and different current loads and high-frequency signals can be applied simultaneously, the real simulation of cable group in cable channel can be realized.

The utility model relates to the technical field of flow meters, and discloses a flow adjusting mechanical device of a runner flow meter, which comprises a flow meter main body, a liquid inlet joint and a liquid outlet joint are respectively arranged on the upper wall and the lower wall of the shell, the impellers are fixedly arranged on the same rotating shaft, and the rotating shaft is rotatably connected in the shell. The rear end of the shell extends out of the shell and is fixedly provided with a first positioner, the rear side of the shell is fixedly provided with a second positioner matched with the first positioner, and the front side of the shell is detachably provided with a shell cover; the flow adjusting pipe is arranged on the liquid inlet connector in a sealed connection mode and is detachable, and an electric control valve is arranged on the flow adjusting pipe. The utility model has the advantages that an external rotating speed sensing structure is used, the accuracy is higher, errors are not easy to occur, and the flow can be directly controlled by using control equipment.

This utility model relates to the field of microcrack detection technology and discloses a high-pressure vessel microcrack detection device based on time-series data aggregation analysis. The device includes a support ring with three connecting blocks extending outwards at equal intervals. Each connecting block has a support rod connected to its end. A telescopic rod is mounted on the support rod, and an adjustment knob is located between the telescopic rod and the support rod. A magnetic strip is connected to the lower end of the telescopic rod. A torque block is installed in a threaded hole, and a limit block is located at the lower end of the torque block. A spring connects the limit block and the support ring, and a cylindrical head is located at the lower end of the limit block. A probe is mounted on the cylindrical head, and a transmission line is connected to the probe. Through the combined use of the support ring, torque block, and specific fixing device, the detection personnel can accurately control the applied stress during the detection process, improving the accuracy of the measurement data, reducing the number of measurements, and accelerating the measurement speed.

The utility model discloses a corrugated board measuring and cutting device which comprises a machining table, a damping mechanism is arranged on the lower side of the machining table, a fixing mechanism is arranged on the upper side of the machining table, telescopic rods are fixedly connected to the two ends of the upper side of the machining table respectively, and connecting bases are fixedly connected to the ends of the two telescopic rods. And a moving mechanism is arranged on the inner side of the connecting base, an empty groove is formed in the machining table, four supporting lugs are connected to the lower side of the machining table through bolts, a waste chip collecting box is fixedly connected to the inner sides of the four supporting lugs, and the waste chip collecting box is located on the lower side of the empty groove. Compared with the prior art, the corrugated board measuring and cutting device has the advantages that sweeps can be conveniently cleaned, and the damping function is achieved.

The utility model discloses a laser range finder for high-precision engineering surveying, which belongs to the field of laser range finders and comprises a laser range finder main body, an adjusting mechanism is mounted on the lower surface of the laser range finder main body, and a cleaning protection mechanism is mounted on the surface of the laser range finder main body. The cleaning protection mechanism comprises a protection shell connected to the surface of the laser range finder body in a sleeving mode, one side of the protection shell is fixedly connected with a limiting rod, and the surface of the limiting rod is slidably connected with a protection cover in a sleeving mode. Through cooperative use of the devices, when the laser range finder is used, a protective cover is pulled, so that a linkage toothed plate drives a driving gear to rotate, the driving toothed plate drives a cleaning rod to move on a display screen of the laser range finder main body to clean the display screen, and the laser range finder main body can clean the display screen after measurement. A worker can observe data on the display screen more conveniently, and the worker does not need to clean dust manually.

The utility model relates to medical instrument technical field, especially a head measuring device, the head measuring device includes main part and measurement unit, the main part is configured as the contact with user's head, the measurement unit is connected with the main part, the measurement unit is configured as adjustable structure, the adjustable structure includes first adjusting part and second adjusting part, and the different position of adjusting the first adjusting part and the second adjusting part is combined to realize the adjustment. When using, the head measuring device adjusts the different position of first adjusting part and second adjusting part to realize the adjustment, obtains the head perimeter, has the advantage that the adjustment is simple and convenient, can avoid the deviation when measuring, and then makes the measurement data accurate, realizes the selection accurate wearing specification's ventilation head belt pipe, to increase the treatment effect.

The application relates to the field of laser measuring instruments and discloses an engineering surveying laser range finder, which comprises a base, a laser range finder body and a support for bearing the laser range finder body, the base is provided with a driving assembly, a lifting assembly and a rotating assembly, the support is movably clamped with the rotating assembly, and the support is rotatably installed on the lifting assembly; the driving assembly synchronously drives the lifting assembly and the rotating assembly to move, the height and the angle of the laser range finder body can be double-regulated, the foundation pit can be measured at multiple angles and multiple points, the whole machine does not need to be manually moved, the measuring range is effectively expanded, and the foundation pit measuring requirements of different depths and different shapes can be met; the laser range finder body can be driven to reciprocatingly move along the length direction of the support through the stretching reset assembly, the horizontal measuring interval is further expanded on the basis of the rotation regulation, the measuring blind area is reduced, and the measuring data is more comprehensive and accurate.

This invention discloses a detection and adjustment method for planetary motion mechanisms to solve the problem of low adjustment efficiency caused by relying on the experience of assembly and adjustment personnel when existing planetary motion mechanisms experience jamming during operation. Specifically, it includes: Step 1, establishing a reference coordinate system with the axis of the drive motor output shaft as the Z0 axis; Step 2, measuring the runout ΔT of the driven gear during circular motion and determining whether it meets the preset accuracy constraint. If not, marking the runout position of the driven gear and adjusting the driven gear according to the runout position; Step 3, establishing a coordinate system with the central axis of the worm gear as the Z1 axis; Step 4, aligning the Z1 axis with the Z0 axis, and recording its displacement as the measured center distance d1 between the driving gear and the driven gear; Step 5, determining whether the measured center distance d1 meets the tolerance accuracy constraint. If not, correcting the center distance between the driving gear and the driven gear.

The utility model relates to the technical field of water conservancy supports, in particular to a portable water conservancy water level measuring instrument support which comprises a fixing platform, a plurality of stabilizing mechanisms are arranged below the fixing platform, and supporting mechanisms are arranged in the stabilizing mechanisms. The stabilizing mechanism comprises a fixing support rotationally connected to the lower end of the fixing platform, and a first electric telescopic rod is fixed to the middle of the lower end of the fixing support. By means of the second electric telescopic rod and the micro motor, unfolding of the stabilizing mechanism and adjustment of the supporting mechanism can be automatically completed, the labor intensity of workers is reduced, meanwhile, the problems caused by manual operation errors are reduced, the installation and recovery processes of the support are more stable and reliable, and the work efficiency is improved. The fixing platform in the device is always kept in a horizontal state, the situation that the water level measuring instrument topples over due to the weight of the water level measuring instrument is avoided, the supporting legs are unfolded to a proper angle for supporting, and the stability of the support in a complex environment is effectively improved.

The utility model provides a fixing clamp for detecting the hardness of a conical bearing roller, which is characterized in that a notch is formed in the middle of a base, and each side wing is provided with an arc-shaped groove; arc-shaped racks are fixedly installed on the side wings, the inner arc faces of the racks are tooth faces, the inner arc faces of the two racks are opposite, the racks are located between the arc-shaped grooves and the notches, and the racks and the arc-shaped grooves are concentric. The positioning block laterally extends out of the pipe body and is provided with a through screw hole, the pipe body is provided with external threads, and the through screw hole is perpendicular to the pipe body; the gear is fixedly installed outside the pipe body, the pipe body is inserted into the arc-shaped groove of the base, the other face of the side wing is exposed, and the gear is meshed with the rack. The nuts are located on the two sides of the side wings relative to the gears and screwed on the external threads of the pipe body. The bolt is matched with the through screw hole of the positioning block in a threaded manner and penetrates through the through screw hole; the conical roller is placed in the notch, and the bottom ends of the two bolts abut against the two end faces of the conical roller. According to the utility model, the conical roller can be fixed in the clamp for measurement.

The invention relates to the field of thickness measurement tools, in particular to pipe thickness measurement, and specifically relates to a handheld pipe full-circumferential wall thickness measurement device and a measurement method. The device overcomes the problems of low speed and inaccuracy caused by limited measurement range in the measurement of the whole peripheral wall of the pipe in the prior art, can quickly and accurately measure the thickness of the whole peripheral wall of the pipe, improves the measurement efficiency and precision, and provides powerful support for the quality control and performance evaluation of the pipe. The upper part of the side surface of the base is provided with a cantilever support which is transversely distributed, the lower part of the side surface of the base is provided with a measuring anvil rod which is transversely distributed, the outer end of the cantilever support is provided with a dial indicator, the outer end of the measuring anvil rod is provided with a spherical measuring anvil head, and the outer side of the inner end of the measuring anvil rod is sleeved with a rotatable miniature bearing; the lower end of the measuring rod of the dial gauge is provided with a rolling wheel measuring head which is arranged right above the measuring anvil head.

The application provides a device and a method for synchronously measuring soil-water characteristic curve and permeability coefficient curve of soil. The device comprises a water supply device, a soil sample device, soil sample blocks, a data acquisition device and a data processing device. The soil sample device comprises a soil sample cylinder with a water inlet and an exhaust port, and a plurality of soil sample blocks wrapped by a first filter paper are arranged in a longitudinal direction of the soil sample cylinder, and a first filter paper is arranged between two soil sample blocks. The data acquisition device measures the resistance of each first filter paper and records the time when the resistance changes and measures the water content of the first filter paper; the data processing device receives the collected data from the data acquisition device, and obtains the soil-water characteristic curve and the permeability coefficient curve through the collected data. The device and the method can quickly and accurately synchronously measure the soil-water characteristic curve and the permeability coefficient curve of unsaturated soil.

The invention provides a multi-channel intelligent acoustic actuation control system and method based on improved LMS filtering, and belongs to the technical field of underwater noise test equipment, and the system comprises an actuation unit, a control unit and a signal processing unit. The actuating unit comprises acceleration sensors and vibration exciters, the multiple vibration exciters are installed in the model and used for simulating mechanical vibration, and the multiple acceleration sensors are arranged nearby the vibration exciters and used for measuring vibration response of the model; the control unit comprises a control computer, a linear power supply module and a signal collector, the control computer is connected with a digital-to-analog converter, and the digital-to-analog converter is connected with a signal conditioner; the signal processing unit comprises an alternating current purification power supply and a power amplifier, and the signal processing unit transmits a collected vibration acceleration signal to the control computer through a signal collector. According to the invention, accurate control and real-time state feedback of the vibration exciter are realized, so that the reliability and accuracy of underwater noise testing are improved.

This invention discloses a method and apparatus for measuring the speed and head warpage of a steel billet. The method includes: transmitting a symmetrical triangular linear frequency modulated continuous wave signal to the steel billet to be tested, wherein the symmetrical triangular linear frequency modulated continuous wave, as the local oscillator signal, is generated by a detection device installed at a preset position at the mill exit; after the linear frequency modulated continuous wave is emitted to the steel billet to be tested, an echo signal is generated; the local oscillator signal and the echo signal are mixed to obtain a difference frequency signal; the difference frequency signal is subjected to spectral analysis to measure the target distance of the steel billet to be tested; the difference between two target distances measured in the direction of travel of the steel billet to be tested is calculated, and it is determined whether the difference is within a first preset threshold range; if the difference is within the first preset threshold range, it is determined that the steel billet to be tested has no warpage. This method of the present invention uses linear frequency modulated continuous wave signal for distance and speed measurement, which is not easily affected by flowing water on the steel plate surface and water mist in the optical path, has strong anti-interference ability, and improves the accuracy and stability of steel plate warpage measurement.

This utility model relates to the field of wine aging technology and discloses a level gauge for measuring the liquid level in oak barrels. It includes a float, a connecting rod, an indicator plate, a flange, and a transparent tube arranged coaxially. The float has a hollow structure with a cylindrical center. The radial dimension of the float's center is smaller than the opening of the oak barrel. One end of the float is spherical, and the other end is fixedly connected to one end of the connecting rod, which in turn is fixedly connected to the indicator plate. The radial dimension of the flange is larger than the opening of the oak barrel, and one end of the flange is fixedly connected to one end of the transparent tube. The transparent tube has graduations, and the indicator plate is fitted inside the transparent tube. A through hole is formed in the center of the flange, and the connecting rod is fitted inside the through hole. This level gauge can accurately measure the liquid level in oak barrels during aging, providing accurate data for calculating the aging volume. It has a simple structure and is convenient to assemble and use.