7results about How to "Guaranteed parallelism" patented technology

The utility model belongs to heat exchanger technical field, concretely relates to a heat exchanger double tube plate welding structural member. Heat exchanger double tube plate welding structural member includes: the tube side tube plate is provided with the boss at the right end part of the tube side board tube, is provided with the boss ring main part at the left end part of the shell side tube plate, is provided with the boss ring step at the left end part of the boss ring main part, the right end surface of the boss is with the left end surface of the boss ring main part coaxial contact, the inner side surface of the boss ring step is with the outer side surface of the boss adapts, the outer side surface of the boss ring step and the outer side surface of the boss are the welding position.

The utility model discloses a kind of inner measuring micrometer measuring surface parallelism assembly device, one side of its base is equipped with lock frame, the other side of the base of lock frame rear side is equipped with vertical plate, and left tight force screw and right tight force screw are equipped on vertical plate and are opposite;Lock frame clamps the scale sleeve of inner measuring micrometer to make the left measuring claw I and right measuring claw I of inner measuring micrometer be between left tight force screw and right tight force screw, and the top of each measuring claw is equipped with stick hole, and left measuring stick and right measuring stick are equipped with through clamp parallel clamping corresponding to left and right stick hole;Adjusting each tight force screw side portion of corresponding measuring claw is pressed to eliminate the fit gap between measuring screw and threaded shaft sleeve of inner measuring micrometer;Lower fixture and left measuring stick and right measuring stick are inserted in left and right stick hole, and each stick hole is removed clamp after firmly measuring stick is bonded with glue.Using the utility model, it is guaranteed that the parallelism of measuring surface generatrix when inner measuring micrometer is used meets the requirement of national standard.

A standard calibration frame for a crystal ingot bonding stage and a method for bonding 12-inch semiconductor crystal ingots are disclosed. The standard calibration frame includes a base that can be installed on the workpiece board station of the crystal ingot bonding stage and two calibration crossbars fixed on the base. The base is rectangular, and the two calibration crossbars are spaced apart along the length of the base. The distance from the end of any calibration crossbar to the longitudinal center line of the base is equal, and the line connecting the ends of the two calibration crossbars on the same side of the base's length direction is parallel to the length direction of the base. This invention can eliminate the influence of equipment wear and tear on the crystal ingot bonding accuracy, ensuring the quality of the final product.

The application discloses a composite roller pressing mechanism and a composite roller pressing system, which comprise a roller pressing support, a driving roller rotatably supported on the roller pressing support, a driving roller driving device for driving the driving roller to rotate, a pressing assembly and a driven roller rotatably supported on an output end of the pressing assembly, the pressing assembly being used for driving the driven roller to move close to and away from the driving roller, and a parallelism adjusting device used for adjusting limit positions of two ends of the driven roller, which face one side of the driving roller. The parallelism adjusting device can adjust the limit positions of the two ends of the driven roller, so that when the driven roller cannot keep parallel with the driving roller, the parallelism adjusting device of one end of the driven roller is adjusted, the driven roller can keep parallel with the driving roller, different positions of the driving roller and the driven roller have the same composite pressure, and the composite degrees of different areas of an electrode sheet and a diaphragm are consistent.

The utility model relates to the field of panel door, especially a double-panel fluorine-lined panel door with sealing air, which comprises a main body mechanism, an anticorrosion mechanism arranged around the main body mechanism, a guide mechanism arranged inside the main body mechanism, a transmission mechanism arranged at the upper end of the main body mechanism, and a sealing mechanism arranged at the upper end of the main body mechanism. The utility model prolongs the service life of the anticorrosion mechanism and the sealing mechanism extension device, solves the problem that the existing device adopts a single anticorrosion measure of corrosion-resistant metal material, which is expensive and may cause great economic loss due to the expansion of point corrosion to large-area corrosion perforation of duplex stainless steel or high-nickel-based alloy material over time.

This invention discloses a micro-thrust measurement device and method. The micro-thrust measurement device includes a working base plate, a pivot and fixing module, a three-axis displacement stage, a torsion beam, a linear guide rail, a displacement sensor, a micro-thrust generator, and a counterweight. The linear guide rail is mounted on the working base plate and consists of a long guide rail and a short guide rail. The torsion beam is positioned between the long and short guide rails. Slider blocks are installed at the ends of both the long and short guide rails furthest from the torsion beam. The slider of the long guide rail houses a micro-thrust motor for measuring the micro-thrust, while the slider of the short guide rail houses a counterweight. The displacement sensor and the micro-thrust generator are respectively located on both sides of the long guide rail. The three-axis displacement stage is mounted on the torsion beam via the pivot and fixing module. This invention enables sub-millinewton-level micro-thrust testing of micro- and nano-satellite micro-propulsion systems. It is easy to operate, improves measurement accuracy, increases the measurement range of the testing system, and reduces costs.

A wide-temperature, high-precision optical acceleration sensing chip and acceleration sensor based on the principle of a microcavity interferometer are disclosed. The acceleration sensing chip includes a first substrate, a second substrate, and a third substrate. An optical fiber mounting base and a light-transmitting hole are formed on the first substrate. The chip is characterized by a single-mode optical fiber assembly fixed on the optical fiber mounting base. The end face of the single-mode optical fiber assembly is precision ground and perpendicular to the axis of the optical fiber core. The optical fiber mounting base is a stepped hole with a first stepped portion and a second stepped portion. The single-mode optical fiber assembly includes a glass sleeve disposed on the outer layer and a single-mode optical fiber disposed in the core. The first stepped portion, the second stepped portion, the end face of the glass sleeve, and the end face of the single-mode optical fiber are all perpendicular to the core axis of the single-mode optical fiber. The first stepped portion forms a first fit with the end face of the glass sleeve, and the second stepped portion forms a second fit with the end face of the single-mode optical fiber.