37results about How to "Overcoming the effects of friction" patented technology

The invention relates to a standard apparatus for force measurement, comprising a big hydraulic cylinder and a small hydraulic cylinder; wherein, a weight lifting mechanism is fixed on a piston rod of the small hydraulic cylinder, the weight is arranged below the weight lifting mechanism; the small hydraulic cylinder is communicated with the big hydraulic cylinder to form a communicating vessel by a communicating pipe, a force application mechanism is arranged on the piston rod of the big hydraulic cylinder and the force application mechanism comprises a top beam, a bottom beam and two connecting bars, a movable platform is arranged on two pillar stiffeners which are fixed on a pedestal of the standard apparatus and the movable platform is connected with the pillar stiffeners with a screw thread pair, a load-bearing surface is arranged under the movable platform, another load-bearing surface is also arranged on the upper surface of the bottom beam of the force application platform, and the two load-bearing surfaces correspond with each other. In the invention, by means of static press ram-cylinder system, the Pascal's principle is adopted, a small force value is amplified to a standard large force value, thus reducing the effect of friction force to the maximum extent; furthermore, measurement correction, checking, definition and rating can be carried out on a force sensor with large force value accurately, thus being beneficial to major scientific research projects.

The invention discloses a testing device and method for gas-containing soil sample consolidation tests and penetration tests. The testing device comprises a base, a middle ring is connected with the top of the base, an upper ring is mounted at the top of the middle ring, a rubber water bag is arranged at the lower part of the middle ring, a water injection pipe is mounted outside the middle ring,a three-way valve A is communicated with the water injection pipe and communicated with a water inlet pipe and a water outlet pipe, and a pressure sensor B is mounted on the water outlet pipe; a waterflow channel B and a water flow channel C are formed in the middle of the middle ring, a pressure sensor A is connected at the water flow channel B in a closed manner, the water flow channel C is communicated with a three-way valve B through a pipeline A, and the three-way valve B is communicated with a flow measuring pipe and a water supply device through pipelines; a piston is mounted in the upper ring, a top cap is mounted at the top of the piston, and a drain pipeline is formed in the lower part of the top cap and communicated with a liquid metering pipe through a pipeline B; an exhaust pipe is arranged at the top of the top cap. The testing device is suitable for gas-containing soil penetration and consolidation tests, has the advantages of novel structure, lower cost and the like and improves the measurement accuracy of tests.

The invention discloses a recovery type on-site sound emission sensor, which comprises a sound emission probe, a probe installation mechanism, and a delivery mechanism for delivering a combination body of the sound emission probe and the probe installation mechanism to a setting position in a drill hole of a rock mass to be monitored. The probe installation mechanism comprises a shell, a probe sleeve, spring sleeves, springs and a fixed pulley assembly; the probe sleeve is installed in a shell guiding cylinder; the spring sleeves are fixed to two sides of the probe sleeve; the springs are installed in the spring sleeves; one end of a first rope in the fixed pulley assembly is fixedly connected with an end cover on the upper end face of the probe sleeve through a fixed pulley arranged on the top part of the inner wall of the shell. According to the recovery type on-site sound emission sensor provided by the invention, through interaction of the first rope and the springs arranged between the shell and the probe sleeve, a movement direction of the probe sleeve can be controlled, and the effects of effective installation and coupling of the sound emission probe are realized; the effective coupling of the sound emission probe and a drill hole wall is ensured, and the mine rock (body) stability and rock burst dynamic disaster monitoring and predicting reliability are improved.

The invention belongs to the technical field of material mechanical test measurement, and provides a high-precision multi-range novel force sensor set of the series structure. The force sensor set iscomposed of a base, an upper cover, a loading rod, a high-range force sensor, a high-linearity spring, a force transmission shaft, and a low-range force sensor. The series structure composed of a small-range force sensor and a large-range force sensor is introduced, and the readings of the small-range and large-range force sensors can be read at the same time for different measurement accuracies.The high-linearity quality spring can not only pre-tighten and balance the initial force, but also limit and protect the low-range force sensor, and under the condition of increasing seal structure protection, the sensor set can be placed in a pressure chamber for underwater measurement, and the friction force influence of the loading rod can be avoided. The high-precision multi-range novel forcesensor set of the series structure is compact, reasonable and reliable in structure, high in structural stability, overload-protecting, airtight and waterproof, convenient to use, and low in cost. Therange of the sensor can be combined according to actual requirements and the sensor set can be applied to different material testing machines and stressing measuring structures.

The invention provides an initial phase position and phase sequence detection method of a motor and a permanent magnet synchronous motor control system. The initial phase position and phase sequence detection method of the motor is applied to the permanent magnet synchronous motor control system. The method provided by the invention comprises the following steps: using an encoder to respectively obtain first displacement data of a motor rotor rotating to a Q axis, second displacement data of the motor rotor rotating from the Q axis to a D axis, third displacement data of the motor rotor rotating from the D axis to a -Q axis, and fourth displacement data of the motor rotor rotating from the -Q axis to the D axis in sequence; according to the second displacement data, the fourth displacementdata, and the line value of the encoder, obtaining initial phase position information of the motor to be detected; and according to the first displacement data, the second displacement data, and theline value of the encoder, determining a phase sequence of the motor to be detected. That is to say, according the method provided by the invention, not only the initial phase position of the rotor can be automatically detected, but also a motor wiring phase sequence can be automatically detected; in addition, influence caused by the friction is overcame, and the detection accuracy of the initialphase position is improved.

The invention relates to a mechanical type end surface sealing specific pressure measuring device for a high-speed liquid oxygen turbine pump. The mechanical type end sealing specific pressure measuring device is used for accurately measuring end surface sealing specific pressure data. The device comprises a sealed static ring assembly, a movable ring, a first shaft sleeve, a housing, a shaft, a pressurizing mouthpiece, a sealing gasket, a second shaft sleeve and a pressure sensor. According to the mechanical type end surface sealing specific pressure measuring device of the invention, the problem that specific pressure data cannot be accurately measured in original sealing design can be solved, a piston shaft can be stressed in a balanced manner, and measurement accuracy is improved. The mechanical type end surface sealing specific pressure measuring device is suitable for the mechanical sealing of the high-speed oxygen turbine pump and can meet the requirements of a variety of liquid and gas media; the mechanical type end surface sealing specific pressure measuring device is easy to operate and simple in processing, and can adapt to engine operating conditions; and the mechanical type end surface sealing specific pressure measuring device can meet sealing end surface specific pressure tests for product tests and has a wider application range.

The invention relates to a horizontal well jarring jam releasing device and a construction method thereof used for underground jam releasing work of horizontal wells. The device comprises a jar and a jarring force increasing device, a jarring accelerator is connected between the jar and the jarring force increasing device through an oil pipeline, and comprises a transmission shaft and a center pipe, the transmission shaft is connected with a transmission sleeve through a connecting key, and energy storage springs are arranged in a work barrel outside the center pipe; the upper portion of the transmission shaft is connected with the jarring force increasing device through an accelerator upper joint or an oil pipe coupler, the lower portion of the transmission shaft is connected with the center pipe, the upper portion of the work barrel is connected with the transmission sleeve, and the lower portion of the work barrel is connected with the jar through an accelerator joint; the transmission shaft can drive the center pipe to move upwards to compress the energy storage springs. The device is connected in a jam releasing pipe column, if a fish jam point is not released, ground pumping pressure is increased, force is increased for jam releasing, the requirement for the load of ground equipment is lowered, and the applicability of the jam releasing device is improved. The jam releasing success rate of the horizontal wells can be improved, and the work cost of the horizontal wells is greatly lowered.

The invention discloses a vertical air conditioner and air deflector sliding mechanisms. Each air deflector sliding mechanism comprises a rack, a motor, a gear and a guide rail groove, wherein the rack is located on the side, close to an air conditioner body, of an air deflector and comprises a tooth portion and a guide rail portion, the motor is located on the air conditioner body, the gear is rotationally connected with the motor and meshed with the tooth portion of the rack, the guide rail groove is located on the air conditioner body, the guide rail portion of the rack is located in the guide rail groove, the groove bottom and / or the groove wall of the guide rail groove are / is provided with a plurality of protruding support bodies, and the support bodies are in contact with the guide rail portion. In this way, the air deflector sliding mechanisms greatly reduce the contact areas between the guide rail portions and the guide rail grooves, so that the motion friction force is reduced, the racks are prevented from being influenced by the friction force during movement, the potential hazard that the air deflectors are stopped suddenly and even gets stuck when the air deflectors are driven to move is effectively avoided, and stable and smooth operation of the air deflectors is guaranteed.

The invention relates to an oil agent for the spinning of viscose staple fibers. The oil agent is compounded by, by weight, 18-35 parts of composition F and 65-82 parts of composition S, wherein the composition F comprises polyoxyethylene oleate, tetradecyl alcohol oleate, fatty acid polyoxyethylene ether, liquid paraffin and ethanol; the composition S comprises fatty alcohol ether phosphate potassium, castor oil polyoxyethylene ether, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester and a water component. The oil agent for the spinning of the viscose staple fibers has the advantages that the oil agent can effective regulate the dynamic and static friction coefficient in the fiber spinning, the friction performance of the fibers can be improved, the cohesive force among fibers can be increased, good smoothness and softness can be provided for the fibers, undesirable phenomena such as tow loosening, fuzziness, breaking and static can be eliminated or reduced, and the needs of the spinning can be satisfied.

The invention discloses a clamping device for a thin plate compression experiment, which belongs to the technical field of plate forming test equipment and is used for clamping a thin plate of a compression experiment. The technical scheme is as follows: the middle of a sample is placed between a front sample clamping plate and a rear sample clamping plate; a strain measuring hole opposite to themiddle of the sample is arranged on the plate surface of the front sample clamping plate; a screw rod connects a clamping support plate with the front sample clamping plate and the rear sample clamping plate by nuts; the two ends of a spring are separately embedded in the spring seat between the clamping support plate and the rear sample clamping plate; the front sample clamping plate is connectedto a front upper groove shape clamping plate and a front lower groove shape clamping plate respectively; the rear sample clamping plate is connected to a rear upper groove shape clamping plate and arear lower groove shape clamping plate respectively; and the upper and lower parts of the sample are placed between the front upper groove shape clamping plate, the rear upper groove shape clamping plate and the front lower groove shape clamping plate and the rear lower groove shape clamping plate. The clamping device for the thin plate compression experiment has a simple structure and high test accuracy, can facilitate strain collection, and can complete all experiments of compression and tension-compression cyclic loading of thin plates with different strength levels and thicknesses.

The invention discloses a testing device of the radial rigidity of a piston ring. The testing device comprises a fixed platform, a rotating table and a testing assembly, wherein the testing assembly comprises a tension spring, a back-up post, a pressure sensor and a rigid rope; the fixed platform is fixed on a horizontal base; an annular drop pit is formed in the middle of the fixed platform; the position of the center of circle of the drop pit is round and hollow, and the rotating table is installed in the position; the rotating table comprises a rifled tube, a knob and a bolt, the bolt is installed in the rifled tube, and the knob is arranged on the bolt; a sliding chute is formed along the circumference direction of the drop pit, and the testing assembly is installed in the sliding chute; the side wall of the sliding chute is connected with one side of the back-up post, and a groove matched with the pressure sensor is formed at the other side of the back-up post and used for installing the pressure sensor; the pressure sensor is abutted against the outer side of the piston ring; and bosses are respectively arranged at the upper and lower ends of the back-up post, one end of the rigid rope is wound on the bosses, and the other end of the rigid rope is wound on the bolt. The testing device of the radial rigidity of the piston ring avoids the influence of friction force in the traditional method, and is simple in testing operation, high in efficiency, applicable to constant wall pressure rings and non-constant wall pressure rings, and high in practicability.

The invention discloses a detector for low-speed drop hammer impact test of circular pipe fitting and an impact test instrument. The detector comprises a test bench assembly, a drop hammer impact assembly, a vibration signal measurement assembly and a displacement signal measurement assembly. The test bench assembly comprises a base, a sliding guide rod, a material bearing mechanism and a photoelectric door. The drop hammer impact assembly comprises an impact plate, a force sensor, a hammer head and a shading sheet. The vibration signal measurement assembly comprises a first laser vibration meter and a second laser vibration meter. The displacement signal measurement assembly comprises a first linear displacement sensor and a second linear displacement sensor. The first linear displacementsensor is used for detecting the displacement of the impact plate when the hammer head hammers the circular pipe fitting, and the second linear displacement sensor is used for detecting the displacement of a measuring point of the circular pipe fitting when the hammer head hammers the circular pipe fitting. The detector obtains the impact deflection of each measuring point of the circular pipe fitting in the axial direction according to the displacements, the impact deflection is data of the impact moment, and the data is very accurate.

The invention discloses a geosynthetic material direct tensile / pull-out tester, which comprises a workbench composed of a horizontal plate and supporting legs, and further comprises a driving device,a pull-out device, a displacement measuring device, a tension measuring device and a data collector which are arranged on the workbench. The invention also discloses a test method for carrying out a drawing test on the geosynthetic material by using the direct tensile / pull-out tester. According to the horizontal direct tensile / pull-out tester and a sample preparation mold and a sample preparationmethod matched with the horizontal direct tensile / pull-out tester, tests find that the designed instrument and mold are scientific and efficient, one machine has two purposes, and direct tensile testsand pull-out tests of plain soil, cement soil and fiber reinforced cement soil samples can be well achieved.

The invention discloses an automatic control device for aero-engine bleed. The automatic control device for aero-engine bleed comprises a shell and a pneumatic valve installed in the shell in a sliding mode. An air inlet A for bleeding air from a low-pressure stage is formed in one axial end of the shell, and an air inlet B for bleeding air from a high-pressure stage of an engine and an air outlet for guiding the air to a lubricating oil sealing cavity of a supporting system are formed in the two side walls, which are relatively staggered in the radial direction, of the shell; a movable limiting groove for limiting the large end of the pneumatic valve is formed in the shell at the air outlet and is used for controlling the communication state of the air outlet and the air inlet A or the air inlet B; a sealing layer is arranged on the periphery of the small end of the pneumatic valve and is in sliding sealing contact with the inner wall of the shell; a force application assembly is installed between the small end of the pneumatic valve and the inner wall of the end of the shell and can drive the pneumatic valve to move; and multiple air holes communicating with the atmosphere are formed in the side wall, provided with the force application assembly, of the shell.

The invention discloses an acoustic emission monitoring system comprising an acoustic emission sensor and a ground work station. The acoustic emission sensor is used for being mounted in a borehole of a monitored rock body and is composed of an acoustic emission probe, a probe mounting mechanism and a transmission mechanism for transmitting the mounting mechanism on which the acoustic emission probe is mounted to a preset position in the borehole. The probe mounting mechanism of the acoustic emission monitoring system of the invention solves the problem of effective installation and coupling of the acoustic emission sensor through the pluggable connection and cooperation between a second cover plate of a guide assembly and an upper end cap of a probe sleeve, not only facilitating acoustic emission probe transmission, but also ensuring the coupling effect between the acoustic emission probe and a borehole wall, thereby enhancing the monitoring and forecast reliability of the rock (body) engineering stability and rock burst dynamic disasters. In addition, the system can also achieve usage of multiple acoustic emission probes at the same time, with a wider range of applications.

The invention relates to a device for connecting a lifting mechanism and a working box and applied to a 3D printer. The device comprises the working box, the lifting mechanism and an even number of electric suction discs, the electric suction discs are arranged at the top of the lifting mechanism and connect the working box with the lifting mechanism through magnetic force, and the electric suction discs are symmetrically arranged at the top of the lifting mechanism; and the lifting mechanism comprises a main frame, a driving member and lifting members, the driving member is arranged inside the main frame, and the lifting members are symmetrically arranged on both sides of the main frame correspondingly. According to the device for connecting the lifting mechanism and the working box and applied to the 3D printer, the fact that an existing working box can't keep the horizontal descent or descends too slowly , and can't reach the expected position quickly and stably in the descent process is overcome, in the non-printing process, the working box is separated from the lifting mechanism, and the maintenance is facilitated; and in the printing process, the working box is connected withthe lifting mechanism through the electric suction discs, a bottom plate of the working box can reach the expected position horizontally, stably and quickly, and the device printing accuracy is improved.

The invention provides an on-phase method for an alternating current servo system capable of overcoming friction force influence. The on-phase method comprises the following steps: establishing an on-phase coordinate system alpha beta coordinate system for compensating the friction force influence, and setting an on-phase front magnetic pole N to be positioned above alpha axis; and recording the reading of a position encoder by using rotations in different rotation directions, so that an ideal on-phase position x0 for compensating the friction force influence is calculated. According to the on-phase method for the alternating current servo system capable of overcoming the friction force influence, by using a twice on-phase method, the influence of friction force is compensated, and the defects of an existing on-phase technology are recovered.

The invention discloses an acoustic sensor for monitoring rock burst. The acoustic sensor comprises an acoustic emission probe, a probe installation mechanism and a transmission mechanism, wherein the transmission mechanism is used for a combination body of the acoustic emission probe and the probe installation mechanism to a set position in a drilling hole of a to-be-monitored rock body; the probe installation mechanism is mainly formed by a sleeve assembly, a guiding assembly, an end cover and a spring; the guiding assembly is in pluggable connection with the sleeve assembly or the end cover; the assembled probe installation mechanism is used for locking the acoustic emission probe in a probe sleeve of the sleeve assembly; the spring in an elastic sleeve of the sleeve assembly is in a compression state. According to the acoustic sensor for monitoring rock burst, disclosed by the invention, through pluggable connection and matching between the guiding assembly and the sleeve assembly or the end cover and by utilizing the action of an elastic restoring force of the spring, the control to a movement direction of the guiding assembly and a probe assembly is realized, so that the problem of effective installing and coupling of the acoustic emission probe is solved, and not only can the acoustic emission probe be conveniently transmitted, but also the coupling effect of the acoustic emission probe and the wall of the drilling hole can be ensured.

The invention discloses an anchor rod pull-out test device, and relates to the field of anchor rod pull-out test detection. The device comprises: a lower counter-force base plate and an upper counter-force base plate which are oppositely arranged, wherein the lower counter-force base plate is provided with a first anchor rod hole; a plurality of connecting beams arranged between the lower counter-force base plate and the upper counter-force base plate, wherein the connecting beams are arranged in the circumferential direction of the first anchor rod hole, and the two ends of each connecting beam are fixedly connected with the lower counter-force base plate and the upper counter-force base plate correspondingly; and a hollow jack fixedly connected to the upper counter-force base plate. Thedrill hole where the anchor rod on the working face is located is located in the orthographic projection of the first anchor rod hole on the working face. By adopting the anchor rod pull-out test device provided by the invention, the pull-out force measured by the hollow jack can be prevented from being influenced by the friction force between the anchor rod and a grouting body.

The invention discloses a test device for dynamic characteristics of extrusion flow of capsule magneto-rheological fluid, which comprises a flexible capsule, the upper edge of the flexible capsule is clamped and sealed by an upper end cover and an upper guide seat installed coaxially, and the lower edge of the flexible capsule is The edge is clamped and sealed by the coaxially installed lower end cover and the lower guide seat, and the outer side of the flexible bag and the inside of the outer cylinder are provided with excitation coils; a working cavity is formed between the flexible bag, the upper end cover and the lower end cover, and injected Magneto-rheological fluid or other liquids to be tested; a guide cavity is formed between the flexible bladder, the upper guide seat and the lower guide seat to guide the extrusion deformation of the flexible bladder. The invention can be used to test the dynamic characteristics of magnetorheological fluid extrusion or extension flow, especially the extrusion or extension flow dynamic characteristics of magnetorheological fluid under high-frequency excitation; it can also be used for other fluids with equal volume or equal area Testing of extrusion flow dynamics.

The invention discloses a testing device of the radial rigidity of a piston ring. The testing device comprises a fixed platform, a rotating table and a testing assembly, wherein the testing assembly comprises a tension spring, a back-up post, a pressure sensor and a rigid rope; the fixed platform is fixed on a horizontal base; an annular drop pit is formed in the middle of the fixed platform; the position of the center of circle of the drop pit is round and hollow, and the rotating table is installed in the position; the rotating table comprises a rifled tube, a knob and a bolt, the bolt is installed in the rifled tube, and the knob is arranged on the bolt; a sliding chute is formed along the circumference direction of the drop pit, and the testing assembly is installed in the sliding chute; the side wall of the sliding chute is connected with one side of the back-up post, and a groove matched with the pressure sensor is formed at the other side of the back-up post and used for installing the pressure sensor; the pressure sensor is abutted against the outer side of the piston ring; and bosses are respectively arranged at the upper and lower ends of the back-up post, one end of the rigid rope is wound on the bosses, and the other end of the rigid rope is wound on the bolt. The testing device of the radial rigidity of the piston ring avoids the influence of friction force in the traditional method, and is simple in testing operation, high in efficiency, applicable to constant wall pressure rings and non-constant wall pressure rings, and high in practicability.

The invention discloses an engineering rock mass acoustic emission monitoring and transmission system, which includes an acoustic emission sensor and a ground workstation. The acoustic emission sensor is installed in a borehole of the rock mass to be monitored, and the received monitoring signal is transmitted to the ground through a cable. In the workstation, the acoustic emission sensor is composed of an acoustic emission probe, a probe installation mechanism and a transmission mechanism that transmits the probe installation mechanism installed with the acoustic emission probe to a set position in the borehole. The probe installation mechanism includes a housing connected to the transmission mechanism and is used for Probe sleeve to accommodate acoustic emission probes. The probe installation mechanism in the engineering rock mass acoustic emission monitoring and transmission system of the present invention solves the problem of effective installation and coupling of the acoustic emission probe through the mutual cooperation of the air bag and the spring arranged between the shell and the probe sleeve, ensuring that the acoustic emission The effective coupling between the transmitting probe and the wall of the borehole enhances the reliability of monitoring and forecasting of the stability of the mine rock (body) and rockburst dynamic disasters.

The invention discloses an acoustic emission monitoring system comprising an acoustic emission sensor and a ground work station. The acoustic emission sensor is used for being mounted in a borehole of a monitored rock body and is composed of an acoustic emission probe, a probe mounting mechanism and a transmission mechanism for transmitting the mounting mechanism on which the acoustic emission probe is mounted to a preset position in the borehole. The probe mounting mechanism of the acoustic emission monitoring system of the invention solves the problem of effective installation and coupling of the acoustic emission sensor through the pluggable connection and cooperation between a second cover plate of a guide assembly and an upper end cap of a probe sleeve, not only facilitating acoustic emission probe transmission, but also ensuring the coupling effect between the acoustic emission probe and a borehole wall, thereby enhancing the monitoring and forecast reliability of the rock (body) engineering stability and rock burst dynamic disasters. In addition, the system can also achieve usage of multiple acoustic emission probes at the same time, with a wider range of applications.

The invention discloses an acoustic emission sensor which comprises an acoustic emission probe, a probe installation mechanism and a transmitting mechanism, wherein the acoustic emission probe is arranged in a probe sleeve, and the acoustic emission probe is in clearance fit with an inner wall of the probe sleeve; a first spring and second springs are arranged between a shell and the probe sleeve; the first spring is arranged in a frame body of the shell, and the first spring is fixedly connected with an end cover on the probe sleeve, and is in a tension state or free state; the two second springs respectively sleeve guide rods in two spring sleeves, and the two second springs are in contact with stopping plates arranged in inner holes of the spring sleeves, and are in a compressed state. According to the acoustic emission sensor disclosed by the invention, the probe installation mechanism solves the problem that an acoustic emission probe cannot be effectively installed and coupled through controllable extension and retraction of the first spring and the second springs which are arranged between the shell and the probe sleeve; thus, reliability of monitoring and predicting mine rock (body) stability and rock burst dynamic disasters is enhanced.

The invention discloses a load test device. The load test device comprises a base, a deflecting plate, a load distribution beam, a ballast head and a horizontal load plate; one end of the base is provided with a fixed baffle plate, and the other end of the base is provided with a fixed U-shaped horizontal supporting seat; the opening direction of the horizontal supporting seat is away from the baffle plate, a convex part of an opening is arranged on the surface, adjacent to the baffle plate, of the horizontal supporting seat, and a long cylindrical horizontal load head is arranged in the convex part; one end of the deflecting plate is hinged to two wings of the horizontal supporting seat, and the other end of the deflecting plate is hinged to one end of the load distribution beam and can rotate; the other end of the load distribution beam is hinged to the ballast head, the horizontal load plate is arranged below the ballast head, and a joined bearing is arranged between the ballast head and the horizontal load plate. The total load is divided into the ballast and the horizontal plane shearing load by virtue of the load distribution beam according to a lever principle, and the vertical load and the horizontal load can be synchronously applied to a test piece by utilizing one centralized load point, so that the problem that ballast and surface shearing composite load requirement cannot be satisfied by a pressure machine and a universal test machine can be solved.

The invention relates to a contact thermal resistance detection device under micro-stress conditions, which relates to the technical field of contact thermal resistance detection. It solves the problem that the traditional contact thermal resistance detection device can only detect the heat transfer of the tested part under relatively large stress, and cannot realize the contact thermal resistance under micro stress or no stress state. At the same time, there is a contact stress effect caused by the material's own weight. problems that cannot be eliminated. The detection device of the present invention makes the left fixing plate and the right fixing plate clamp the measured piece through the cooperation of the screw rod and the nut, and controls the elongation of the spring through the nut, so as to realize the micro-stress loading of the tested piece. There are scales, so the elongation of the screw can be determined, and then the prestress between the tested parts can be determined. At the same time, the tested parts are supported by the lifting table; The heat in the plate will not be transferred to the vacuum cover through the support frame, so that the heat can be concentrated and the detection accuracy can be improved. The invention is suitable for detecting contact thermal resistance.