134 results about "Compression testing" patented technology

The utility model discloses a lightweight packaging carton strength detection device, which comprises a compression testing machine main body, an upper pressing plate and a lower pressing plate, the output end of the compression testing machine main body is fixedly connected with the upper pressing plate, and the lower pressing plate is placed at the bottom of the upper pressing plate. Through the cooperative use of the compression testing machine main body, the upper pressing plate, the lower pressing plate, the accommodating groove, the auxiliary assembly, a through groove, a sliding block, a limiting plate, a rack, a screw rod, a motor, a stabilizing groove, an isolation plate and anti-skid grains, the problems that the existing equipment is often lack of effective clamping measures; the problems that paper boxes with different sizes and shapes are difficult to stably and properly fix when the strength of the paper boxes is tested due to the fact that the paper boxes are difficult to fix, the paper boxes are prone to displacement or inclination in the testing process, the stress is uneven, the testing result is distorted, and the operation complexity is obviously increased are solved.

A replacement structure for a hold-down head of a pressure testing machine comprises a pressure testing machine body, a hydraulic cylinder, a fixing cover, a worm gear, a worm, a fastening clamping sleeve, a center shaft sleeve and the hold-down head, the hydraulic cylinder is provided with a fixing plate, the fixing plate is connected with the pressure testing machine body, the hydraulic cylinder is provided with a piston rod, the piston rod penetrates through the pressure testing machine body and is connected with a mounting sleeve, and the mounting sleeve is connected with the worm gear. The right side of the worm gear is provided with an outer supporting plate, the outer supporting plate is provided with a bearing plate, the outer supporting plate is attached to the worm gear, the worm gear is provided with a position control rod, the position control rod is sequentially connected with the outer supporting plate, the fixing cover and the central shaft sleeve, and position control protruding blocks are arranged on the two sides of the central shaft sleeve. The position control rod is provided with a position control groove, the position control protruding block is matched with the position control groove, the position control protruding block is connected with the position control groove, the position control rod is provided with a fastening supporting rod, the fastening supporting rod is connected with the inner side of a fastening supporting sleeve, and the outer portion of the fastening supporting sleeve is connected with a fastening clamping sleeve.

This invention relates to a comprehensive mechanical performance testing platform for articulated bogies of trackless loaders, encompassing the field of mechanical performance testing technology. It includes an integrated platform with tensile / compression and torsional testing components. The tensile / compression testing components include a support frame with mounting side plates fixed to its upper surface. Tension / compression loading modules are telescopically mounted on the mounting side plates. Each loading module includes a compression top support head with a pressure sensor mounted on its side end face. A tension chuck is fixed to the outer peripheral wall of the compression top support head near its end, and four tension jaws with sliding and telescopic movement are mounted on the chuck, each equipped with a tension sensor. This testing platform solves the problems of dispersed testing, low efficiency, reliance on manual labor, insufficient accuracy, platform instability, and poor versatility inherent in traditional technologies for comprehensive mechanical performance testing of articulated bogies of trackless loaders.

The utility model belongs to the technical field of composite bone defect repair materials, and particularly relates to an osteogenic activity nHA / SF composite bone defect repair material compression resistance detection device which comprises a detection frame, and the bottom end of the inner side of the detection frame is fixedly connected with a detection base; a stretching assembly; the pressure sensor is arranged at a position on one side of the pressure detection seat; the stretching assembly is used in cooperation with the detection base and the detection pressure base. A positioning assembly; the detection assembly is arranged at one end of the detection pressure seat and corresponds to the stretching assembly; through the structural matching design of the detection base, the detection pressure base and the stretching assembly, after the bottom end of the bone repair material is fixed to the detection base, the stretching assembly is adjusted to the position below the detection pressure base, and then the stretching assembly is fixed to the top end of the bone repair material; and the detection pressure seat is moved upwards, so that the detection of the stretchability of the bone repair material is facilitated, and the detection diversity of the device is improved.

The application provides an edge compression testing device and an operating method. The edge compression testing device comprises a base, a positioning part arranged on the base and used for positioning a to-be-tested plate, and a testing part comprising a limiting structure and a movable structure. The limiting structure limits the movable structure on the base with a set force matching a required edge compression. In operation, the to-be-tested plate is moved to make an edge part of the to-be-tested plate press the movable structure. If the movable structure moves and the to-be-tested plate is not deformed, it is determined that the edge compression of the to-be-tested plate meets the requirement. If the to-be-tested plate is deformed, it is determined that the edge compression of the to-be-tested plate does not meet the requirement. In this way, the plate is not damaged, the consumption of the plate is avoided, and the testing method is simple. Compared with the existing edge compression tester, the edge compression testing device has relatively simple structures, is convenient to move and carry, has flexible application scenarios, and is suitable for wide use.

The utility model discloses a shell compression resistance testing device which comprises a base, vertical frames are symmetrically and fixedly connected to the base, second limiting sliding grooves are formed in the vertical frames, a transverse frame is arranged between the two vertical frames, second limiting sliding blocks are fixedly connected to the two ends of the transverse frame, and the second limiting sliding blocks are in sliding fit with the second limiting sliding grooves. A sliding rod is installed in the transverse frame in a sliding mode, a connecting threaded hole is formed in the lower end of the sliding rod, a connecting stud is installed in the connecting threaded hole in a threaded mode, a testing head is fixedly connected to the lower end of the connecting stud, an installation base is fixedly connected to the upper end of the sliding rod, and a limiting screw rod is fixedly connected to the upper face of the installation base. By starting the driving motor, the testing head can be driven to move upwards and then move downwards quickly to hit the equipment shell to carry out dynamic pressure bearing capacity testing, the testing head can also press the equipment shell in a static state directly to carry out static pressure testing on the equipment shell, and the anti-pressure capacity of the equipment shell can be detected more effectively and comprehensively.

The present application relates to the technical field of shield muck treatment, and discloses a method and system for predicting the resource utilization of shield muck, which comprises collecting samples and pretreating, measuring quality and particle size distribution, obtaining initial parameters through initial pressure compression testing, obtaining parameters under different pressures through step-by-step pressure testing, inputting data into a prediction model to determine the availability and determine the optimal utilization mode, and generating a report for storage. The system comprises sample selection and pretreatment, fixation and measurement, initial parameter collection, test parameter collection, and resource utilization prediction modules. The method and system can accurately predict the resource utilization potential of shield muck, determine the optimal utilization mode, improve the resource utilization efficiency, and have good economic and environmental benefits.

The invention relates to a metal material strain rate effect measurement method based on multiple stress relaxation, which comprises the following steps: carrying out a standard quasi-static stretching or compression test on a material sample at a constant strain rate to obtain a stress-strain curve; analyzing a strain range according to a stress-strain curve, and determining a stress relaxation frequency N to be developed and a corresponding relaxation strain value sequence epsilon i, i = 1... N; a material sample is taken to be subjected to a tensile or compression test at a set strain rate, stress relaxation lasts for relaxation time delta t when the strain sequentially reaches values in each relaxation strain value sequence, and after each stress relaxation, the tensile or compression test is performed according to the set strain rate; obtaining a stress-plastic strain rate curve corresponding to each relaxation strain epsilon i; and obtaining a stress-strain curve corresponding to each strain rate. Stress-strain curves corresponding to different plastic strain rates in a quasi-static range can be obtained through a single sample.

The utility model discloses an elastic member suspension tension and compression testing device, which relates to the technical field of tension and compression testing devices and comprises a base, a fixed seat is fixedly connected to the left side of the top of the base, a central controller is fixedly connected to the rear side wall of the fixed seat, and fixed frames are fixedly connected to the tops of the fixed seat and a movable sliding seat. Pressure compensation clamping assemblies are arranged in the two fixing frames, and a testing assembly is arranged on the right side of the top of the base. According to the utility model, through the arranged pressure compensation clamping assembly, pressure adjustment can be carried out according to a pressure signal fed back by a pressure sensor, and the clamping force of the elastic member suspension is ensured to be within a proper range, so that the reliability of test data is improved; the device can accurately control and adjust the magnitude of the applied tension or pressure to meet different test requirements, so that the performance of the elastic part suspension under different tension and pressure conditions is accurately evaluated.

The invention discloses a point load and compression testing device and method. The invention provides a device for a point load and compression test and a method for carrying out the point load and / or compression test by using the device. The device comprises; a first plate; a reconfigurable second plate having a first configuration 5 and a second configuration wherein the spacing between the first plate and the second plate is adjustable; a test region between the first plate and the second plate; the centering mechanism is used for placing the sample in the center of the test area; wherein the first plate and the second plate are arranged, in use, such that when the spacing between the first plate and the second plate is adjusted to reduce the spacing, the compression test is performed if the second plate is in the first configuration; if the second plate is in the second configuration, a point load test is performed.

The utility model provides a kind of cord fabric pressure test device, the lower part of the clamp is provided with compression testing machine platform, the upper part of the clamp is provided with down device, the clamp includes clamp main body, the lower part of the clamp main body is provided with connecting flange, connecting pin passes from the inside of connecting flange, the clamp main body is surrounded with cord fabric, large clamp piece is installed in the both sides of the cord fabric, the large clamp piece is fixed in the clamp main body with cord fabric, small clamp piece is installed in the both sides of the upper side of the cord fabric, the small clamp piece is compacted in the upper side of cord fabric, spring is installed between the large clamp piece and clamp main body, the top of the clamp main body is provided with pressure head, connecting pin passes from the top of pressure head;The utility model can make contrastive analysis to data by a series of standardization test to cord fabric, prevent the risk of structural failure in advance, to reduce the risk of tire burst.

The utility model discloses a carton compression tester capable of fast loading and unloading, which relates to the technical field of carton compression tests and comprises a pressure measuring box, a hydraulic push rod and a pressure measuring plate, the hydraulic push rod is arranged at the top of the pressure measuring box in a penetrating manner, and a mounting plate is arranged at the bottom of the hydraulic push rod. According to the carton compression tester capable of achieving rapid feeding and discharging, rapid feeding and discharging of cartons can be achieved through stretching and retracting of an electric telescopic rod, convenience and time saving are achieved, the working efficiency of the carton compression tester can be effectively improved, the bottom of a hydraulic push rod is connected with a mounting plate through a pressure equalizing rod, the cartons can be evenly extruded, and the working efficiency of the carton compression tester is improved. According to the carton compression tester capable of rapidly loading and unloading, the stress of each part of the carton can be better monitored, and the compression simulation effect is better, so that the carton compression tester capable of rapidly loading and unloading solves the problems that after the carton compression tester completes pressure measurement, an operator needs to manually clean a carton body and chippings on the upper side of the supporting platform, and the working efficiency of the carton compression tester is reduced.

A simulation method of battery mechanical impact test, comprising: respectively performing tensile test on a sample of a preset positive plate, a sample of a preset negative plate, a sample of a preset separator and a sample of a preset shell to obtain corresponding mechanical data; and / or, respectively performing compression test to obtain corresponding mechanical data; constructing a battery model according to the corresponding material parameters and mechanical data of the preset positive plate, the preset negative plate, the preset separator and the preset shell; constructing an impact process model according to a preset impact condition, and using the impact process model to perform impact simulation test on the battery model corresponding to the preset battery to obtain a simulation test result, which includes energy data corresponding to the preset positive plate, the preset negative plate, the preset separator and the preset shell. The impact simulation test of the battery model by the impact process model makes the energy change of the preset positive plate, the preset negative plate, the preset separator and the preset shell in the impact process quantifiable.

The utility model discloses an expandable compression testing machine, and relates to the technical field of compression testing machines. The device comprises a bottom plate, a compression mechanism is arranged on the bottom plate, the compression mechanism comprises a [-shaped frame fixedly connected to the top of the bottom plate, an electric push rod is fixedly connected to the top of the [-shaped frame, and an output shaft of the electric push rod extends into the [-shaped frame and is in sliding connection with the [-shaped frame. Accurate control over the moving path of the hold-down device in the compression process can be achieved through the compression mechanism, the possibility that the hold-down device deviates in the operation process is fundamentally eradicated, the accurate control enables the hold-down device to be kept highly stable in the moving process, and therefore when pressure is applied to a sample piece, the sample piece is not prone to deviation. The pressure can be ensured to uniformly and accurately act on the sample piece, the test error caused by non-uniform pressure or deviation is effectively avoided, the reliability and precision of the test result are remarkably improved, and more valuable data support is provided for scientific research and production.

The application relates to the technical field of compression resistance testing, and particularly relates to a stress compression resistance testing device of a robot modular fingertip structure and a testing method thereof, which comprises a cabinet body, a placing table arranged in the cabinet body and used for placing a robot hand, a horizontal moving seat movably arranged in the cabinet body and an assembly plate, the horizontal moving seat can be driven by a second linear driving module arranged in the cabinet body to move horizontally, the assembly plate can be driven by a pressure applying driving mechanism arranged in the cabinet body to move away from or close to the horizontal moving seat, so that a pressure applying piece arranged on the side of the assembly plate away from the horizontal moving seat is in contact with the robot finger; the first pressure applying plate and the second pressure applying plate are arranged to form a V-shaped structure, the robot finger can be directly pressed, and the stress condition of the robot finger when a local part of a gripped object enters the finger gap during the working process of the robot can be simulated, so that the diversification of the stress compression resistance mode of the robot during testing is realized.

The application provides a manufacturing method of cement mixing piles of soft soil in coastal areas, and belongs to the field of cement mixing piles. The method determines a plurality of sample parameter groups, creates a plurality of cement mixing pile samples corresponding to the plurality of sample parameter groups, respectively performs impermeability testing and compression testing on the plurality of cement mixing pile samples, and obtains an impermeability parameter group and a compression parameter group of each cement mixing pile sample, determines the impermeability parameter and the compression parameter of each cement mixing pile sample, obtains a comprehensive parameter of each cement mixing pile sample in the plurality of cement mixing pile samples, and the comprehensive parameter is the sum of the compression parameter and the impermeability parameter of the cement mixing pile sample; the sample parameter group corresponding to the cement mixing pile sample with the maximum comprehensive parameter is determined as a target parameter group, and the cement mixing pile is manufactured based on the target parameter group, so that the performance of the manufactured cement mixing pile is improved.

The utility model discloses a compression resistance testing device for an automobile charger. The compression resistance testing device comprises a U-shaped rack at the top of a base, an air cylinder installed on the inner side of the top end of the U-shaped rack, a lifting platform slidably installed on the inner side of the U-shaped rack and connected with the free end of the air cylinder, and an extrusion testing head installed at the bottom of the lifting platform. The rotary testboard is rotatably mounted on the top surface of the base, and the two clamp assemblies are arranged at the top of the rotary testboard; according to the utility model, through improvement and optimization of an automobile charger compression resistance test device in the prior art, the rotary test bench is adopted and the rapid limiting structure is matched, so that an operator can rapidly change the direction of the charger through direct rotation of the test bench under the condition of not interrupting the test in the process of testing the automobile charger, and the test efficiency is improved. Therefore, continuous and efficient extrusion testing on different positions of the surface of the charger is achieved, the testing steps are simplified, and the operation difficulty is lowered.

The utility model discloses a device for a wave spring compression test, which relates to the technical field of wave spring compression tests and comprises a bottom support, a longitudinal driving portal frame fixedly mounted at the upper end of the bottom support, a moving plate mounted on the longitudinal driving portal frame, and an extrusion component fixedly mounted on the moving plate. The extrusion assembly is composed of a connecting rod and an extrusion plate, three notch grooves are formed in the extrusion plate, the limiting measurement assembly, the adjusting assembly and the supporting assembly are arranged, wave springs of different diameters can be limited and blocked, and therefore when the wave springs of different diameters are tested, horizontal movement of the wave springs can be avoided, and the test accuracy is improved. Therefore, the smooth operation of the compression test of the wave spring can be ensured, and meanwhile, when the recovery capability of the wave spring under different compression degrees is measured, the recovery capability of the wave spring can be directly observed through the scales on the baffle without the help of external equipment, so that the measurement efficiency can be improved.

The utility model discloses a pressure resistance testing device for a buffer air bubble film for packaging, which relates to the technical field of production and detection of the buffer air bubble film and comprises a counterweight base and a frame, a fixed die holder is fixedly connected to a lower table top of the frame, a movable die sleeve is detachably sleeved on the fixed die holder, and a pressure resistance testing device for the buffer air bubble film for packaging is arranged on the movable die sleeve. The upper table top of the rack is movably connected with a test rod which is vertically distributed, the bottom of the test rod is detachably provided with a tip, the middle part of the test rod is provided with a circular truncated cone, a long spiral spring which is sleeved on the test rod is arranged between the circular truncated cone and the bottom of the upper table top, and a support spring which is sleeved on the test rod is arranged between the test rod and the top of the upper table top. According to the utility model, an air bubble film sample is fixed and positioned after being unfolded by buckling the fixed die holder and the movable die sleeve, the test rod releases downward pressure to impact the air bubble film sample under the elasticity of the long spiral spring after being manually lifted, and the tip can be mounted on the test rod, so that the impact resistance and puncture resistance of the air bubble film can be detected.

This invention provides a compression testing device for corrugated cardboard box production, belonging to the field of corrugated cardboard box technology. The device includes a base, a testing platform and a controller on the upper end of the base, a square frame above the testing platform, and a lifting mechanism on the base to drive the square frame to rise and fall. The square frame is equipped with a guide rail, a moving trolley and a scanning imager, and a feeding mechanism on one side. The scanning imager can perform all-round real-time scanning of the initial state and compression process of the cardboard box. The top pressing mechanism can complete accurate pressure testing of empty box compression resistance, holding pressure and stacking simulation, and simultaneously realize synchronous monitoring of pressure and deformation. Through the ingenious linkage and cooperation of various components, the entire process of corrugated cardboard box testing is automated, the stacking test has strong stability, and the pressure and deformation detection is accurate and comprehensive, greatly improving the testing efficiency. Moreover, the device has strong versatility and convenient maintenance, and can meet the compression testing needs of corrugated cardboard boxes in large-scale production lines.

The application provides a verification method and device for compression function in an SOC system, and relates to the chip detection technical field. The method comprises the following steps: determining a master device and a corresponding slave device in the SOC system; calling a test case of the SOC system; performing multiple access operations on the master device and the slave device based on a write / read data path between the master device and the slave device to perform compression / decompression test and obtain bandwidth data corresponding to each access operation, wherein the access operation comprises a write operation and a read operation; determining a compression efficiency corresponding to each write data path based on first bandwidth data corresponding to the write operation on the write data path; and determining a decompression efficiency corresponding to each read data path based on second bandwidth data corresponding to the read operation on the read data path. The application has the advantages of high working principle efficiency, fast simulation speed, and accurate SOC system compression efficiency and decompression efficiency.

The utility model relates to the technical field of battery detection, in particular to a power battery puncture and extrusion detection device, which comprises a puncture cabin and a power cabin which are arranged in a test machine body along the vertical direction, a lifting driving part is arranged in the power cabin, and a battery platform is arranged in the puncture cabin in a liftable manner. The battery platform is connected to the lifting movable end, the bottom of the lifting driving piece is hinged to the testing machine body, the movable end of the lifting driving piece is hinged to the bottom of the battery platform, and the puncture head is located at the top of the testing machine body of the moving track of the battery platform. The two cabins are arranged, different functions can be achieved, mutual influence in the puncturing process is avoided, reaction generated after battery puncturing occurs in the puncturing cabin, the influence on power elements in the power cabin is reduced, and safety threats to the surrounding working environment are avoided.

The invention discloses an electric reactor compression resistance testing machine and method, and relates to the technical field of electric reactor tests.The electric reactor compression resistance testing machine comprises a detection table, a bottom plate, a supporting frame, compression resistance detection assemblies, a limiting sliding rod and a second hydraulic push rod, and an adjusting mechanism used for synchronously adjusting the heights of the two compression resistance detection assemblies is arranged above the detection table; and a clamping mechanism for clamping and fixing the reactor is arranged on the detection table. According to the invention, through the adjusting mechanism, accurate, stable and synchronous adjustment of the two pressure-resistant detection assemblies can be realized, balance of detection forces at two sides can be effectively ensured, and vertical precision of the pressure-resistant detection assemblies in a lifting process can be ensured, so that detection requirements of reactor insulation sleeves with different height specifications can be met; meanwhile, the height of the compression resistance detection assembly can be conveniently and finely adjusted according to the detection progress, sectional type comprehensive detection of the large-size insulation sleeve is achieved, a detection blind area is effectively avoided, and therefore the integrity and efficiency of compression resistance detection are further improved.

A kind of automatic feeding mechanism of compression testing block, including positioning mechanism, transposition mechanism, push mechanism and lifting mechanism, positioning mechanism is fixedly arranged on pedestal, and positioning mechanism has positioning cavity inside;Transposition mechanism is fixedly arranged on pedestal and is located at the front end of positioning mechanism, and transposition mechanism has transfer mechanism and cleaning mechanism on it;Push mechanism is fixedly arranged on fixed column, and push mechanism has push plate on it;Lifting mechanism is fixedly arranged on the rear end of push mechanism;Two cement test blocks are placed in transfer mechanism, under the action of push plate, the previous cement test block is located in lifting mechanism and is lifted upward under the action of lifting mechanism, the following cement test block enters positioning cavity and carries out compression strength test, the following cement test block is cleaned after compression strength test by cleaning mechanism, then, the previous cement test block enters positioning cavity and carries out compression strength test under the action of lifting mechanism, the utility model discloses higher degree of automation, can quickly handle batch cement test block's compression strength test.

The utility model discloses a kind of durable corrugated box compression testing device, including bottom plate, the top side of bottom plate is equipped with long slot, long slot is cross-shaped, fixedly installed with placing plate in long slot, through the collaborative design of driving assembly, transmission assembly and clamping assembly, effectively solve the carton side fixed problem, motor as driving source, drive first bidirectional screw rod rotation, through the multistage transmission of first synchronous wheel, synchronous belt, second synchronous wheel, transmission rod, first bevel gear and second bevel gear, make first bidirectional screw rod and second bidirectional screw rod reverse rotation, since the thread rotation direction of two screw rods is opposite, the slider of its outside drives fixed rod and clamping plate synchronous to carton four sides and adhere, after clamping plate and carton side contact, limit the displacement of carton when testing, inclination, ensure that vertical pressure evenly conducts to carton surface, avoid the test force value deviation caused by side no constraint, improve the accuracy and reliability of test data.

This utility model discloses a filter cartridge testing device that facilitates input pressure adjustment, including a placement and locking structure. An adjusting compression testing structure is fixedly installed above the placement and locking structure. The placement and locking structure includes a mounting frame with a through groove, and a collection box with a through-hole shape at the front and top is fixedly installed below the mounting frame. A recessed frame slides inside the collection box. A connecting plate is fixedly installed above the through groove, and a hollow recessed frame with a locking groove is installed above the connecting plate. The adjusting compression testing structure includes a fixing frame fixed above the mounting frame, and a controller for controlling and driving the adjustment of components is fixedly installed above the fixing frame. A through frame is fixedly installed below the fixing frame, and a drive motor with an output end extending inside the through frame is fixedly installed at one end of the through frame. This filter cartridge testing device, which facilitates input pressure adjustment, uses the locking groove to achieve locking and limiting.

This invention discloses a disc spring tension and compression testing device, relating to the technical field of spring testing equipment. The invention includes a base frame, with a first and second receiving boxes placed on opposite sides of the base frame. Supports and bases are installed at the front and rear ends of the base frame, respectively, and abutments are installed on both sides of the rear end of the supports. It also includes a protective assembly comprising a fixed ring mounted on the upper surface of the support and a protective sleeve connected to the rear end face of the fixed ring. The other end of the protective sleeve is located on the front end face of a moving ring. A cylinder is mounted on the top of the front end face of the moving ring. An air port on the outer wall of the cylinder is connected to two connecting pipes via a three-way pipe. The other end of the connecting pipe is connected to an air outlet pipe via a pipe joint. The other end of the air outlet pipe is located on the top of the outer wall of the air cylinder. A rubber pad is slidably installed inside the air cylinder. This disc spring tension and compression testing device provides good protection for workers, has a wide range of applications, and improves material feeding efficiency.

The utility model relates to the technical field of glass micro-melting pressure sensors, in particular to a compression resistance testing device for a glass micro-melting pressure sensor, which comprises a bottom plate, side plates fixedly arranged on the bottom plate, the tops of the side plates are mutually connected, sliding openings are formed in the inner walls of the side plates, air cylinders are arranged in the sliding openings, and the telescopic ends of the air cylinders are fixedly connected with pressing plates. Foldable and retractable protection plate mechanisms are arranged at the two ends of the pressing plate, a mounting table is arranged in the center of the top of the bottom plate, a mounting groove for mounting a clamp is formed in the mounting table, and a locking mechanism for locking the clamp is arranged on the inner wall of the mounting groove. According to the utility model, the foldable and contractible protection plate mechanism and the turnover plate are arranged and are distributed on the two sides of the top protection cover, and the folding plate on the back and the turnover plate in front of the top protection cover can effectively block high-speed splashing broken glass generated after the sensor is broken, so that the broken glass is prevented from causing body injuries such as cutting injury and stabbing injury to testers; meanwhile, test equipment and peripheral precise instruments are prevented from being damaged, and economic losses are reduced.