1331results about How to "Practical structure" patented technology

The invention discloses a city regional railway signal system and a control method thereof. The city regional railway signal system comprises a control center device, a plurality of station devices, a line side unit and a vehicle device; the control center device is used for obtaining the running information of every train and outputting the movement information of the trains to the station devices after processing; the station devices are used for outputting the train movement information output from the control center device and the route information established through the line side unit to the vehicle device after processing; the line side unit is used for detecting the train position information, establishing train routes according to the interlocking information, enabling the route information of the trains to be generated into the message information and outputting the message information to the vehicle device; the vehicle device is used for adjusting the running state of the trains according to the train route control information and the message information and feeding back the adjusted running state of the trains to the station devices. According to the city regional railway signal system and the control method thereof, the functions such as the interconnection and intercommunication of the line network interior, accurate stopping, shielding gate linkage and interval automatic running and automatic turn-back can be achieved based on an ETCS-1 (Europe Train Control System-1) platform.

The invention discloses a telescopic copper pipe component which comprises an inner pipe and an outer sleeve. The outer sleeve is sleeved on the inner pipe. A inner pipe through hole is formed in the center of the inner pipe. A plurality of linear grooves parallel with the central line of the inner tube are evenly distributed on the outer periphery of the inner pipe. Protrusions are disposed on the inner wall of the inner hole of the outer sleeve. The protrusions are disposed in the grooves. By the structure, when the outer sleeve is sleeved on the inner pipe, the protrusions can move linearly along the grooves, and the outer sleeve can move along the inner pipe. In addition, annular grooves are evenly formed in the outer periphery of the inner pipe, and the central line of each annular groove coincides with that of the inner pipe. When the protrusions enter the annular grooves, the outer sleeve can be relatively locked with the inner pipe by rotating the outer sleeve. The telescopic copper pipe is simple in structure and practical.

The invention discloses a rotatable wrist minimally-invasive electrode. The electrode comprises a head, an extension rod, a handle and two joints, wherein the head can complete the activities of five degrees of active freedom, is closer to the functions of a human wrist, and can complete the actions and surgeries which are difficultly completed and even cannot be completed by the certain traditional minimally-invasive surgical instruments; and on the other hand, the handle can perceive the pressure of a working area of the head to a certain degree, and provides certain basis for distinguishing tissues, organs, tumors and calculi for an operator.

A cycle cold wind device used in the high pressure frequency conversion device, includes a high pressure frequency conversion device cabinet for the cooling process to the heating components in the cabinet, a heat exchange cabinet for the separating cool to the hot air by the water in the disk pipeline, an air intake connecting channel for delivering the hot air discharged from the high pressure frequency conversion device into the air inlet of the heat exchange cabinet, and an air outtake connecting channel for delivering the cold air discharged from the heat exchange cabinet into the air inlet of the high pressure frequency conversion device. The air in the high pressure frequency conversion device and the heat exchange cabinet constitutes a sealing space of the cold and hot air cycle flow through the air intake connecting channel and the air outtake connecting channel. The device is changed into the sealing door from the traditional high pressure frequency conversion device, then is added with a heat exchange cabinet and two vent channels, thereby better solving the defect on the heat radiation of the high pressure frequency conversion device, with the advantage of simple structure, practicality, low cost of the manufacture, the use and the maintenance, long service life and marked efficacy.

An optical fiber grating wave length demodulation system belongs to the technical field of optical fiber sensing and optical measurement. The demodulation system comprises a broad band light source (1), a tunable filter (2), a 1x2 coupler, a wave length calibration module, a photodetector, a 1xN optical switch (5) and a signal processing system. The inside connection of the wave length calibration module is that: one end of a standard tool filter (6) is connected with an output end of a third 1x2 coupler (11)m the other end of the standard tool filter is connected with a reference grating (10), an input end of the third 1x2 coupler is connected with an output end of a first 1x2 coupler; the other output end of the third 1x2 coupler is connected with a signal processing system (9) by a second photodetector (4) to implement the wave length calibration. The calibration of the reflected optical fiber grating wave length can be implemented rapidly and accurately by the standard tool filter and the reference grating, the signal can be effectively demodulated for high precision. The system also can be used for monitoring temperature and stress and so on physical quantities.

The invention relates to a method for repairing heavy metal-polluted soil or sludge with nano-zero-valent iron (nZVI). The method comprises the following steps of: fully mixing treated soil, sludge and the nZVI by using a nanotechnology, wherein a part of heavy metals in the soil or sludge is reduced by the nZVI, and the other part is adsorbed onto the surface of the nZVI, so that the heavy metals in the soil or sludge are removed; and separating the nZVI containing heavy metals by adopting a magnet, so that the change of the physicochemical property of the soil or sludge during or after the removing process is reduced. The method is easy to operate, has a remarkable effect, can be used for removing copper, nickel, zinc, cobalt, chromium, cadmium, lead and the like existing in the soil orsludge in one step, and has the characteristics of low cost, high repairing rate and the like when applied to the type of heavy-metal-polluted soil. In the invention, certain adjustment can be performed on parameters, such as nZVI concentration, treating time, liquid-solid rate and the like, according to different kinds and contents of heavy metals contained in different polluted soil or sludge. Purified soil or sludge gets back to farmlands, so that secondary pollution is not caused.

This invention relates to permanent simultaneous motor control system based on NN with five free degree and with no bearing, which is characterized by the following: one two-free degree with no bearing simultaneous motor, one three-free degree alternating radium and axis direction mixed magnetic bearing form one sample body; three Clark anti-conversion, three current tracing anti-converter and one linear power amplifier, sample machine and its load work as one integration to form compound controlled subject; using static NN summer through study formula to form NN reverse for non-linear dynamic decoupling control on five free degrees bearing.

The invention relates to a welding gun adjusting device and an automatic welding gun with the same. The welding gun adjusting device comprises a welding head (2) and a welding gun (1) mounted on the welding head (2), wherein the welding head (2) can drive the welding gun (1) to realize position adjustment in three-dimensional direction. By adopting the welding gun adjusting device, the welding gun (1) can realize position adjustment in three-dimensional direction, and a welding angle adjusting mechanism can adjust the welding angle of the welding gun (1); and through adoption of a welding tracking device, corresponding position adjustment of the welding gun (1) can be taken along with a rolling pinch roller (4) so as to realize accurate positioning of the welding gun (1). The automatic welding machine provided by the invention can control the driving devices respectively through a welding control system so as to realize automatic welding.

The invention discloses a constructing method of a nerval net generalized inversing bearingless permanent magnet synchronous motor decoupling controlling device, which takes two Clark inverse transformations, two electric current tracing type inverters, a bearingless permanent magnet and a load model as a whole to form a composite controlled object, a nerval net generalized inverse of the composite controlled object is formed through adopting static nerval net added with a plurality of linear links, then the nerval net generalized inverse is reversely arranged before the composite controlled object to form a generalized pseudolinear system, the generalized pseudolinear system is decoupled to three single input and output subsystems through linearization, finally a nerval net generalized inverse, the two Clark inverse transformations and the two electric current tracing type inverters are all formed to a nerval net generalized inversing bearingless permanent magnet synchronous motor controlling device, the controlling device can not only realize dynamic decoupling between a radial position system of a motor and torque moment system and between radial forces, but also be taken as a nonlinear open-cycle controlling device to use directly, and stable suspension and operation of a rotor of a motor can be ensured.

A gutter inlet automatic overflow pollutant intercepting device comprises a clamping seat. At least one extensible rod is connected with the portion below the clamping seat. The lower end of the extensible rod is connected with a metal support. The metal support and the extensible rod are sleeved by a filter screen. The gutter inlet automatic overflow pollutant intercepting device is characterized in that the clamping seat comprises a grease absorbing cable clamping groove. According to the gutter inlet automatic overflow pollutant intercepting device, pollutants entering a gutter inlet is intercepted through the pollutant intercepting filter screen, so that the gutter inlet and a rainwater pipeline are prevented from being blocked, and the water discharging capacity of a rainwater pipeline network is improved; the pollutants are controlled from a source through the rainwater pipeline network, so that disposing pressure of a sewage disposal plant and pollution to city water by runoff pollution are reduced. Grease type pollutants in runoff rainwater can be effectively controlled through the arrangement of a grease absorbing cable, so that the following disposing cost of the sewage disposal plant and the pollution of city water are reduced, and the gutter inlet automatic overflow pollutant intercepting device has obvious environment and economic benefits. According to the gutter inlet automatic overflow pollutant intercepting device, the structure of an existing gutter inlet is not changed, the improving cost of the gutter inlet is reduced, and the gutter inlet automatic overflow pollutant intercepting device is simple in structure, practical and low in production cost.

A laser radar optical path autocollimation method and collimator are disclosed that comprise reflector, laser, signal detecting element, receiving telescope and computer. It's characterized in that it includes mirror bracket, a fixed plate is mounted on the mirror bracket, a movable plate is mounted on the fixed plate, the fixed plate is connected with the movable plate via springs, the reflector is located on the movable plate, two sets of slide blocks / micrometer mechanism and driven step motor are mounted in the mirror bracket, there are push-rods on the slide blocks which extend from the hole on top of the bracket and the fixed plate to the underside of the movable plate. The slide blocks and the push-rods are motivated upwards by the rotation of the driven step motor, the movable plate is adjusted to rotate along the X, Y axis, and the target position of the reflector is fixed at last with high accuracy. The application prospect: atmosphere scientific experiment measuring apparatus and measuring means can be used in various laser radar systems.

The invention discloses a multifunctional food baking tray which comprises a machine body, wherein three heating elements capable of heating hamburgers in a layered manner are arranged on the machine body and arranged at intervals; a heating area for heating raw materials of the hamburgers uniformly is formed between two adjacent heating elements; the raw materials are heated in the heating areas in a layered manner; the three heating elements are a top heating element, a bottom heating element and a middle heating element which are arranged up and down; and the middle heating element is arranged between the top heating element and the bottom heating element. The multifunctional food baking tray capable of heating uniformly is provided by the invention according to the laminated structure of the hamburgers; as three heating trays are arranged on the baking tray, raw materials at the upper, middle and lower parts of the hamburgers can be heated by heaters simultaneously, which ensures uniform heating of the hamburgers; and especially, the raw materials in the middle of the hamburgers are heated, which avoids the phenomenon that the raw materials in the middle of the hamburgers are undercooked while raw materials on two sides of the hamburgers are burned.

The invention relates to a process for restoring heavy metal contaminated soil / sludge through combining nanometer zero-valent iron (nZVI) with an electromagnetic rake. The specific procedures are as follows: soil / sludge to be treated and nanometer zero-valent iron are mixed intensively; a part of heavy metal in the soil / sludge is reduced by nZVI and the other part is adsorbed to the surface of the nZVI; after reaction, clean soil / sludge and the nZVI are separated through an electromagnetic rake device; and the electromagnetic rake adsorbs the nZVI through the acting force of a generated magnetic field, so that the nZVI can be fixed on a column of the electromagnetic rake to be separated effectively. Through the physical separation, changes to the physical chemical property of the soil / sludge are reduced during or after the process of removal. The process is simple to operate and obvious in effect; copper, nickel, zinc, cobalt, chromium, cadmium, lead and the like in soil can be removed at one time, and then heavy metal adsorbed on nZVI is reclaimed and separated through the electromagnetic rake. The process of restoring heavy metal contaminated soil / sludge through the nZVI technology has the characteristics of low cost, high restoring efficiency and the like; and resources are reclaimed through the electromagnetic rake, so that secondary pollution is not caused.

The invention belongs to the field of hydraulic engineering, and provides a model and a method for studying landslide surge propagation rules and predicting the service life of a dam, and aims to build a landslide surge model which can embody interaction of a landslide mass and a water body and can take features of the landslide surge in river channels into consideration on the premise that materials and movement states of the landslide mass are considered. According to the method, a reservoir landslide surge calculation model is built on the basis of a water wave model algorithm adopting an N-S (Navier-Stokes) equation, with combination of a numerical simulation and landslide surge model test and with use of source data acquired by relevant instruments, the rationality and universality of the built landslide surge calculation model are verified through multiple landslide surge model schemes, a lost boundary surface is introduced for consideration of a dam damage effect, not only are the landslide surge propagation rules disclosed, but also one method for predicting the residual life of the dam is worked out, and theoretical basis and scientific evidence are provided for further study of the landslide surge propagation rules and reasonable prediction of the service life of the dam.

The invention discloses a modified clamping piece type anchorage device which comprises an anchor ring assembly, a clamping piece assembly, a jacket and an isolation sleeve tube, wherein an anchor eye is formed in the anchor ring assembly, an expansion portion is arranged in the anchor eye, the jacket is arranged in the anchor eye, when the clamping piece assembly is inserted into the anchor eye, the jacket is clamped in the anchor eye through the anchor ring assembly and the clamping piece assembly, the isolation sleeve tube is arranged at the end portion of the anchor ring assembly, an electric heating device is arranged on the jacket, and the jacket is made from fusible materials. The modified clamping piece type anchorage device can bear the drawing force of 28 tons in the process of support of a foundation pit and a slope and can fully meet existing support requirements. In addition, when the modified clamping piece type anchorage device is needed to be recycled, the electric heating device can be powered on through a line and heat, the jacket can be softened or melted, friction resistance between core materials and the clamping piece assembly can be reduced, and therefore the purpose of convenient recovery of the core materials is achieved. The modified clamping piece type anchorage device is simple in scheme, practical, simple in recovery method of the core materials and convenient to operate.

The invention relates to a method and a device for removing heavy metals in industrial wastewater by a multilevel reversed filter type system. The invention provides unitized airtight reactors which can be connected with one another in series in a multilevel way. Each level of the reactor adopts a reversed filter type design, and is respectively to be a clarification region, a mixed reaction region and a compact reaction region from bottom to top, the bottom of each level of the reactor is provided with a water distributor, and the pretreated heavy metals-containing sewage enters into the compact reaction region to be mixed according to a certain hydraulic condition, and respectively passes through each region from bottom to top. Various heavy metals in sewage, such as Zn, Cu, Pb, Cd, Ni and the like can be removed by the nanoscale zero-valent iron for once due to the auxiliary functions of the absorption, the reduction and the like, the removed heavy metals are attached onto the nanoscale zero-valent iron, and the nZVI in the unit can be recovered and the fresh nanoscale zero-valent iron can be refreshed after the reaction of one reaction unit is saturated. The invention is simple to operate, and prominent in effect, various metals in the medium and low-concentration heavy metals-containing sewage can be removed for once, the water is stably discharged, and the device is easy to maintain. The method has the characteristics of being low in treatment cost, high in removal efficiency, free from secondary pollution and the like.

The present invention relates to a method and its equipment for accurately measuring and analyzing vibratino of body by utilizing laser technique. The equipment includes laser, laser light source, focusing lens, transmission grating, light diaphragm, lambda / 4 wave plate, reflecting prism, focusing lens, lens Wollaston prism, two photoelectric receivers, amplification circuit unit, signal processing unit and frequency mixing element.

A pipe cutting machine is composed of machine frame, mainshaft positioned on machine frame via two bearings, two clamping units positioned at both ends of mainshaft on the machine frame, tool carrier-roller assemblage fixed to mainshaft, slide rod passing through said assemblage, the sliding rotary cage with guide disks connected to both ends of said slide rod, the driver unit consisting of motor, chain wheel and chain, stroke switch and electric control box.

The invention discloses a reinforcing mesh sheet binding machine, and belongs to the technical field of construction equipment. The reinforcing mesh sheet binding machine comprises a material bearingframe, a rack and one or more automatic binding mechanisms. A plurality of steel bars arranged crosswise are borne on the material bearing frame. The rack comprises longitudinal brackets, a transversebracket and vertical brackets. The longitudinal brackets are arranged on the two sides of the material bearing frame. The vertical brackets are slidably arranged on the longitudinal brackets. The transverse bracket is slidably arranged on the vertical brackets and located on the steel bars. The automatic binding mechanisms are slidably arranged on the transverse bracket and can bind binding wiresat the crossing joints of the steel bars. According to the reinforcing mesh sheet binding machine, automatic binding forming of large-diameter reinforcing mesh sheets is achieved, the reinforcing mesh sheet binding machine is high in automation degree, simple and practical in structure, easy to operate, safe and efficient, high-intensity manual labor can be replaced, meanwhile, the reinforcing mesh sheet binding machine is good in binding effect and high in operation efficiency, and steel wires are saved advantageously.

The invention discloses a damping crawler type unmanned mobile platform. The damping crawler type unmanned mobile platform comprises a vehicle body, a module carrying platform body and two sets of crawler wheel mechanisms. The module carrying platform body is arranged at the center of the top face of the vehicle body, a module mounting position is reserved on the module carrying platform body, and different modules can be carried according to the task requirements, such as manipulators and batteries. The two sets of crawler wheel mechanisms are symmetrically arranged on the left side and the right side of the vehicle body. Five damping mechanisms are arranged below the inner portion of each crawler wheel mechanism, vibration of crawler wheels can be reduced, and accordingly stress applied on the crawlers is even. According to the damping crawler type unmanned mobile platform, the crawler travelling mechanisms are designed by adopting an integrated mode that motors are buried in the crawler wheels, the structure is compact, the space use ratio is high, the damping crawler type unmanned mobile platform can passively adapt to the environment by additionally arranging the damping mechanisms, it is ensured that the unmanned mobile platform can still travel stably and not bump on the ground surface with barriers, and the structure is simple, practical and reliable.

The invention relates to a new method and a testing device for characterizing a PCT (percent) curve of hydrogen absorption and desorption of a hydrogen storage material. The testing device adopts the technical scheme that a high-pressure hydrogen cylinder and a high-pressure helium cylinder are connected with a filter by a reducing valve (3) and a reducing valve (4) and are connected with a valve (7) and a valve (14) by a valve (6) respectively; the valve (7) is connected with a mass flow control meter (8) and a valve (9); the valve (14) is connected with a pressure sensor (13) and a valve (12), is connected with a valve (10) in parallel, and is connected with a vacuum pump (11); a sample room (18) is connected with a filter (16) and a valve (15) and is connected with a gas circuit between the valve (14) and the valve (12) by a cross joint; a main body part of a testing system is placed in a thermostat (23); the sample room (18) is sheathed and connected with a heating jacket (19); a photoelectric isolation driver module (25) is connected with a data acquisition card (24); and the data acquisition card (24) is connected with a computer (26). With the adoption of the new method and the testing device, the defects such as errors, unbalance and low precision are overcome. The new method and the testing device are accurate and convenient to operate.

The invention provides a solar-energy hot airflow station based on solar wall technique, comprising a solar-energy chimney, a wind turbine at the lower part of the chimney and a generator. The invention is characterized in that the chimney is build near the building wall whose face and two sides are made from transparent material, the chimney is arranged with thermal insulated material near the wall, while the outer face of the insulated material is disposed with energy storage device. The invention has the advantages in low cost and wide application.

The invention discloses a deep water pipeline composite polyurethane elastomer heat insulation layer casting molding device. A subsection machining and integral assembly mode is adopted in a die, heating temperature control devices are arranged corresponding to subsection assemblies in subsections, and heating oil passages are arranged opposite; a positioning structure and a sealing structure arearranged in the parting surface of the die; and the die is provided with a die opening device, a die closing and an inclination device controlled by a hydraulic system. The device realizes mechanicaloperation of casting molding of a product, and has practical structure and strong operability; by adopting subsection machining in the die, the machining difficulty and the machining cost are reduced, and the machining precision and the machining quality are improved; and meanwhile, three sets of heating devices are used corresponding to three sections of assemblies, so that the heating temperature difference is reduced, the quality of the cast product is improved, automatic control of the temperature of the casting die can be realized, the heat insulation time of the polyurethane heat insulation layer in the die is shortened, and the service efficiency of the casting die is improved.

An electrochemical sensor for detection of trace mercury in a water body comprises a glassy carbon electrode which can be used as a working electrode in a three-electrode system; the surface of a reaction end of the glassy carbon electrode is deposited with a graphene layer, the surface of the graphene layer is deposited with a nano gold layer, the surface of the nano gold layer is self-assembled with a mercury specific oligonucleotide probe which is modified by a mercapto group and can form a double-stranded DNA structure by using T-Hg<2+>-T mismatching. With adopting of the mercury specific oligonucleotide probe for self-assembly on the surface of the reaction end, a stereoscopic response domain which can specifically capture mercury ions is built; and the electrochemical sensor is used for high-efficiency detection of trace mercury in the water body, and has the advantages of simple structure, practicality, convenient manufacture and use, strong environmental impact resistance, good selective specificity, ultra sensitivity and the like.

The invention relates to a communication system and a method for realizing terminal switching by crossing networks and operators, which are used for converged networks and can realize the terminal switching by crossing different networks such as a telecommunication network, the internet or a radio and television network and the like, or crossing a plurality of different operators. The system is provided with an IP multimedia subsystem (IMS)-based switching terminal application server and three terminals, namely mobile equipment, a computer or a television set provided with a set-top box, wherein the switching terminal application server and the terminals establish or remove a calling by using a session initiation protocol (SIP) and transmit a signaling required by terminal switching. In the method, a switching request initiator is not limited by the network in which the terminal is positioned, and the switching mode is particularly flexible; and the method can realize the switching among different (same)-network same-number terminals or different (same)-network different-number terminals, wherein the switching operation can be performed on any party in a call (a calling party, a called party or a certain party in a multi-party calling), and both a two-party voice-frequency or video call and the terminal switching during the multi-party voice-frequency or video call controlled by a multimedia server are supported.

The invention discloses a multi-receiving-end magnetic coupling wireless energy transmission system, which comprises a plurality of receiving circuits, a control circuit, a drive circuit controlled by the control circuit and a transmitting circuit, wherein the transmitting circuit comprises a transmitting coil, a plurality of resonant capacitor branches connected in parallel with the transmitting coil, a frequency switch driven by the drive circuit and connected in series with the transmitting coil, and an alternating-current power supply providing electric energy to a circuit formed by connecting the transmitting coil and the frequency switch in series; and each resonant capacitor branch comprises a transmitting end resonant capacitor and a branch switch controlled by the control circuit and connected in series with the transmitting end resonant capacitor. The invention provides the magnetic coupling wireless energy transmission system which can realize the function that a single transmitting end provides electric energy transmission for a designated one in a plurality of receiving ends only by adopting a single transmitting coil. According to the system provided by the invention, wireless power supply to only one receiving end in one state can be achieved under the condition of having the capability of providing wireless electric energy transmission for all the receiving ends, and the system is practical in structure, and easy to implement, and greatly reduces the cost.

The invention relates to a multifunctional and combined type intelligent insulating rod which is applied to the fields such as electric power system operation, examining, repairing and high voltage tests. A split type structure is adopted, and a combined type connector or an electroscope device is connected on an insulating rod body in a threaded mode. An intelligent type leakage current detecting device is connected at the tail end of the insulating rod body in a threaded mode. The multifunctional and combined type intelligent insulating rod has good basic functions such as insulating properties, mechanical properties and effective lengths of a traditional insulating rod or an electroscope and also has the advantages that functions are combined, the connector is in a combined type, conversion is convenient, electricity is checked at any time, alarm is given when leakage exceeds the limit and the multifunctional and combined type intelligent insulating rod is convenient to carry and the like. In the effective length of the insulating rod body, the insulating rod body has the function of an electroscope when an electricity checking device head is connected at the front end of the insulating rod body, and the insulating rod body has the function of the insulating rod when the combined type connector is connected at the front end of the insulating rod body. The insulating rod body has the function of intelligent voice alarm when a leakage current out of limit alarming device is connected at the rear end of the insulating rod body, and the insulating rod body has the advantages of being practical in structure, easy to operate, convenient to carry, fast in conversion, complete in effect and the like.

The invention discloses a vacuum circuit breaker with a closing holding device. A hollow cavity is formed in a housing; switch-off springs are sleeved on a movable conductor pole, and arranged in the middle of the cavity in the housing; a movable contact is connected with an ejector rod at the top part of the movable conductor pole; a static contact is fixed at the top part of the cavity and is separated from the movable contact; paired closing holding pawls are arranged at the lower part of the movable conductor pole; pressure springs are arranged between the side parts of the lower ends of the closing holding pawls and the inner wall of the cavity; protrusions are arranged at the middle parts of the closing holding pawls and clamped at the bottom of the movable conductor pole when the movable contact and the static contact are in contact; inclined planes are arranged at the lower parts of the closing holding pawls; the inclined planes of one pair of closing holding pawls form an erect V-shaped structure; a closing holding unlocking block is arranged in the V-shaped structure; and an isolating switch movable contact is arranged at the lower part of the closing holding unlocking block so as to push the closing holding unlocking block to perform up-and-down motion. The vacuum circuit breaker with the closing holding device provided by the invention is convenient to control.

The invention provides a sheet preload positioning and clamping device which pertains to the field of the machinery and automobile manufacture technology. The device consists substantially of a substrate (1), a clamping block (2), a positioning block (3), a preload slider (4), a fastening bolt (5), a fastening nut (6), a preload spring (9) and a preload screw (10). The positioning block (3) is a two-point positioning structure and arranged on the substrate (1). Under the force of the preload spring (9), the preload screw (10) drives the preload slider (4) to ensure a test piece to be positioned on the substrate (1). Under the force of the fastening nut (6), the fastening bolt (5) drives the clamping block (2) to clamp the test piece. The lower end of the substrate (1) is provided with a boss holding end, which can be clamped on the testing machine conveniently. No fixture needs to be dismounted throughout the test processes. The invention can ensure a spot welding test piece to maintain the same clamping position during a plurality of times of clamping and realize the clamping of the test piece.