Abstract: A method for calibrating a short temperature measuring device using a dry body temperature calibrator; wherein a heat soaking block is placed in the furnace of the dry body temperature calibrator, and two temperature measuring holes are in the heat soaking block, the bottom of the furnace includes a temperature control element. This method includes electrically connecting the first standard temperature sensor to the temperature control element through the measuring module and the control module sequentially to form a closed-loop for temperature feedback control, accurately controlling the temperature of the temperature measuring hole, and calculating the temperature difference between the temperature sensor to be calibrated and the standard temperature sensor in the two temperature measuring holes respectively.

Abstract: A calculation method of limit load, deformation and energy dissipating of a ring net panel of a flexible protection net, includes step (1): determining geometrical parameters of the ring net, connection type of steel rings, and diameter of steel wires; step (2): determining a loading rate, a loaded region and a boundary condition of the ring net panel; step (3): obtaining basic mechanical parameters of materials through tests, and establishing a critical damage criterion of the ring net panel; step (4): establishing an equivalent calculation model of a ring net panel based on a fiber-spring unit; and step (5): calculating a puncturing displacement, a puncturing load and energy dissipating of the ring net panel. The method adopts a calculation assumption of load path equivalence.

Abstract: The invention disclose a single-shrapnel bone conduction oscillator, comprising an embedded shrapnel-type bracket, a first combined bracket being snap-connected to a middle of a top of the embedded shrapnel-type bracket, and a second combined bracket being snap-connected an inside of the embedded shrapnel-type bracket, a voice coil being sleeved on an outer surface of the second combined bracket, a washer being placed inside the voice coil, a magnet being placed on a bottom portion of the washer, and a U-CUP being snap-connected to an bottom portion of the embedded shrapnel-type bracket. The invention has a simple structure. The invention adopts the single-shrapnel type design provided, when the oscillator adds an electric signal, the first combined bracket is fixed with the front shell of the headset to generate vibration, and the magnetic circuit is fixed in the embedded shrapnel bracket.

Abstract: A two-stage energy dissipation type shed tunnel support structure connected by a principle of Dougong and a design method thereof are provided. The two-stage energy dissipation type shed tunnel support structure includes a Dougong joint domain, crossbeams and columns. The Dougong joint domain includes section steel members, wavy-wall cylindrical elastoplastic buffers, U-shaped sliding connecting troughs and high-strength bolts. Multiple layers of the section steel members are orthogonally stacked to form a Dougong shape, the wavy-wall cylindrical elastoplastic buffers are arranged between adjacent layers of the section steel members, and the U-shaped sliding connecting troughs are arranged at upper and lower ends of the wavy-wall cylindrical elastoplastic buffers, which realizes a connection between the wavy-wall cylindrical elastoplastic buffers and a section steel in two orthogonal directions.

Abstract: A flexible glass protective net with landscape function for falling objects and a design method thereof includes flexible support ropes, buckling clamps, articulated pieces, glass plates and seam rubber strips; the flexible support ropes are arranged crosswise in a grid shape, the buckling clamps are arranged at grid nodes, and the glass plates are arranged in the grids; the glass plate includes pieces of glass, and the pieces of glass are connected by the seam rubber strips at seams; the glass is clamped and fixed by the articulated piece, the tail end of the articulated piece is connected to the buckling clamp, and the glass plate is connected to the buckling clamp via the articulated piece; mutually crossing and separated slots are reserved in the buckling clamps, and the flexible support ropes at the grid nodes respectively pass through the slots.

Abstract: An expandable modular energy-dissipation protection net unit group includes support columns each provided at each of two ends of each support column with a first horizontal longitudinal rotation reversing device on the left side, a second horizontal longitudinal rotation reversing device on the right side and a transverse rotation reversing device on the bottom; a transverse endless support rope, a longitudinal endless support rope and connectors. The transverse endless support rope is wound on the transverse rotation reversing device. The longitudinal endless support rope is wound on the first horizontal longitudinal rotation reversing device and the second horizontal longitudinal rotation reversing device adjacent. A metal net panel is tied by the plurality of connecting members and hung on the transverse endless support rope and the longitudinal endless support rope.

Abstract: The present invention provides a Bluetooth headset speaker, comprising a bracket, a diaphragm, a voice coil, a washer, a magnet, a U cup, a pad, a first tuning cloth, and a second tuning cloth, wherein the first tuning cloth is fixedly connected to the one side outer wall of the bracket, the one side outer wall of the bracket corresponding to the first tuning cloth is symmetrically provided with through grooves, a through hole is opened on the one side outer wall of the bracket, the second tuning cloth is fixedly connected to one side outer wall of the through hole. Compared with the existing headset speakers, the pad designed by the present invention is internally welded and does not need to be covered with glue, which not only can effectively reduce the production process, but also improves the simplicity of the appearance of the speaker and improves the integration degree of the overall structure of the speaker.

Abstract: A combined type flexible glass net system used for protection against full-particle falling rocks on plank roads in scenic spots includes a supporting layer, an intercepting throwing layer and a flexible glass net isolating layer, wherein the supporting layer is longitudinally arranged above a protective area along a mountain, and includes a supporting steel frame and an oscillating type supporting rod; the intercepting throwing layer is supported on the supporting layer, and includes metal meshes, an along-cross-slope upper connecting rope, an along-cross-slope lower connecting rope, an along-slope connecting rope and a reinforcing rope; and the flexible glass net isolating layer includes glass plates, glass net supporting cables and a hoop type hinged piece, wherein the glass plates are connected to the glass net supporting cables through the hoop type hinged piece, and the glass net supporting cables are hung below the supporting steel frame.

Abstract: A throwing toughness buffer mesh unit for a rockfall protection and a design method of a critical throwing angle thereof are provided. The throwing toughness buffer mesh unit includes a cable column, wherein the cable column is provided with a sliding device on a top end and connected to a foundation structure via a hinged support at a bottom; a support rope, wherein the support rope is connected to the sliding device on the cable column in a sliding way and provided with a spring buffer on an end, wherein the spring buffer is obliquely anchored to a rock mass base near a protection structure; a protection net, which is obliquely hung on the support rope via a connector. A pavement inclination angle of the protection net is adjusted to a critical throwing angle by adjusting a height difference between cable columns to control a throwing track of falling rocks.

Abstract: A two-stage energy dissipation type shed tunnel support structure connected by a principle of Dougong and a design method thereof are provided. The two-stage energy dissipation type shed tunnel support structure includes a Dougong joint domain, crossbeams and columns. The Dougong joint domain includes section steel members, wavy-wall cylindrical elastoplastic buffers, U-shaped sliding connecting troughs and high-strength bolts. Multiple layers of the section steel members are orthogonally stacked to form a Dougong shape, the wavy-wall cylindrical elastoplastic buffers are arranged between adjacent layers of the section steel members, and the U-shaped sliding connecting troughs are arranged at upper and lower ends of the wavy-wall cylindrical elastoplastic buffers, which realizes a connection between the wavy-wall cylindrical elastoplastic buffers and a section steel in two orthogonal directions.

Abstract: The present invention provides an internally welded ANC Bluetooth headset speaker, comprising: a U CUP, a magnet, a washer, a tuning net, a pad, a tuning net cloth, a bracket, a voice coil, and a diaphragm, wherein the bracket is sleeved on a top of the U cup, the diaphragm is sleeved on a top of the bracket, the voice coil is provided at a bottom of the diaphragm, and the voice coil is located inside the bracket, the bottom of the bracket is bonded with a tuning net cloth, and the tuning net cloth is located outside the U cup, the magnet is sleeved inside the U cup, the washer is provided on a top of the magnet, the pad is provided on a top of the washer, and the pad is located at a bottom of the voice coil, the tuning net is provided on the top of the washer, and the tuning net is located on one side of the pad. The internally welded ANC Bluetooth headset speaker has a simple structure and easy operation. It adopts an internal welding structure and is more firmly fixed.

Abstract: An instrument calibration apparatus and a calibration method using same. The apparatus comprises a physical quantity input/output unit, a physical quantity measurement unit, a physical quantity configuration unit, a display unit, a man-machine interaction unit, a storage unit, and a control unit. The apparatus can be widely applied to automatic calibration of multivariable instruments.

Abstract: A pressure calibration apparatus and a pressure instrument calibration information processing method, belonging to the field of pressure instrument measurement and calibration. The pressure calibration apparatus comprises: a pressure calibration unit (1) externally connected to the calibrated pressure instrument (100); a main control unit (2), which is electrically connected to the pressure calibration unit (1); a communication module (3) that is electrically connected to the main control unit (2), and carries out data interaction with a remote database (300) through a network (200). The pressure calibration apparatus can be in a real-time communication connection with the remote database (300), and implements on-field real-time downloading of historical calibration data and calibration schemes of the calibrated pressure instrument (100) and real-time uploading of current calibration data.

Abstract: An expandable modular energy-dissipation protection net unit group includes support columns each provided at each of two ends of each support column with a first horizontal longitudinal rotation reversing device on the left side, a second horizontal longitudinal rotation reversing device on the right side and a transverse rotation reversing device on the bottom; a transverse endless support rope, a longitudinal endless support rope and connectors. The transverse endless support rope is wound on the transverse rotation reversing device. The longitudinal endless support rope is wound on the first horizontal longitudinal rotation reversing device and the second horizontal longitudinal rotation reversing device adjacent. A metal net panel is tied by the plurality of connecting members and hung on the transverse endless support rope and the longitudinal endless support rope.

Abstract: A calculation method of limit load, deformation and energy dissipating of a ring net panel of a flexible protection net, includes step (1): determining geometrical parameters of the ring net, connection type of steel rings, and diameter of steel wires; step (2): determining a loading rate, a loaded region and a boundary condition of the ring net panel; step (3): obtaining basic mechanical parameters of materials through tests, and establishing a critical damage criterion of the ring net panel; step (4): establishing an equivalent calculation model of a ring net panel based on a fiber-spring unit; and step (5): calculating a puncturing displacement, a puncturing load and energy dissipating of the ring net panel. The method adopts a calculation assumption of load path equivalence.

Abstract: A method and a device for detecting the switching value of a pressure switch. The device comprises: a pressure generator in communication with a pressure switch by means of pressure piping, a pressure control element, a pressure sensor, and a controller provided with a data processing unit. The pressure sensor is installed on the pressure piping and is electrically connected to the controller. The pressure control element is electrically connected to the pressure generator to control the pressure generator, and is electrically connected to the controller. The pressure sensor transfers the pressure change of the pressure piping to the controller in real time, the data processing unit acquires the value of the pressure change and generates a control instruction according to a preset pressure change rule, and the pressure control element controls the pressure generator to change the pressure within the piping.

Abstract: An arbitrary-shaped fabricated test block for a high-steep slope rolling stone test includes a connecting square barrel and test block bodies. The connecting square barrel is formed by enclosing steel plates, the steel plates are provided with connecting grooves on a periphery of the steel plates, and the connecting grooves are provided with connecting groove bolt holes. The test block bodies are printed on printing bases by 3D printing technology, connecting plates are fixedly arranged on the printing bases, connecting plate bolt holes are formed in the connecting plates, and high-strength bolts penetrate through the connecting groove bolt holes and the connecting plate bolt holes to connect the test block bodies to the connecting square barrel. A sensor box is fixedly arranged on an inner side of the connecting square barrel, and a sensor is arranged in the sensor box.

Abstract: A method for calibrating a short temperature measuring device using a dry body temperature calibrator; wherein a heat soaking block is placed in the furnace of the dry body temperature calibrator, and two temperature measuring holes are in the heat soaking block, the bottom of the furnace includes a temperature control element. This method includes electrically connecting the first standard temperature sensor to the temperature control element through the measuring module and the control module sequentially to form a closed-loop for temperature feedback control, accurately controlling the temperature of the temperature measuring hole, and calculating the temperature difference between the temperature sensor to be calibrated and the standard temperature sensor in the two temperature measuring holes respectively.

Abstract: A pressure calibration apparatus and a pressure instrument calibration information processing method, belonging to the field of pressure instrument measurement and calibration. The pressure calibration apparatus comprises: a pressure calibration unit (1) externally connected to the calibrated pressure instrument (100); a main control unit (2), which is electrically connected to the pressure calibration unit (1); a communication module (3) that is electrically connected to the main control unit (2), and carries out data interaction with a remote database (300) through a network (200). The pressure calibration apparatus can be in a real-time communication connection with the remote database (300), and implements on-field real-time downloading of historical calibration data and calibration schemes of the calibrated pressure instrument (100) and real-time uploading of current calibration data.

Abstract: A method and a device for detecting the switching value of a pressure switch. The device comprises: a pressure generator in communication with a pressure switch by means of pressure piping, a pressure control element, a pressure sensor, and a controller provided with a data processing unit. The pressure sensor is installed on the pressure piping and is electrically connected to the controller. The pressure control element is electrically connected to the pressure generator to control the pressure generator, and is electrically connected to the controller. The pressure sensor transfers the pressure change of the pressure piping to the controller in real time, the data processing unit acquires the value of the pressure change and generates a control instruction according to a preset pressure change rule, and the pressure control element controls the pressure generator to change the pressure within the piping.