635results about How to "Avoid eccentricity" patented technology

The invention discloses a tensile test fixture used for a tubular product sample, which comprises an integral fixture comprising two concave die fixtures, two concave die cushion blocks, two convex die fixtures and two convex die cushion blocks, an upper positioning plate and a lower positioning plate. The two convex die cushion blocks are respectively fixed on the mounting surfaces of the two convex die fixtures; and the two concave die cushion blocks are respectively fixed on the mounting surfaces of the two concave die fixtures, and the convex arc faces of the convex die cushion blocks and the concave arc faces of the concave die cushion blocks are matched to become a pair of fixtures. The upper positioning plate and the lower positioning plate are respectively fixed on the side surfaces of the two convex die fixtures. The tensile test fixture is connected and positioned with a testing machine by the flanges of the convex die fixtures and the flanges of the concave die fixtures. The invention can firmly fix the tubular product sample and avoids the performance change of a tubular product caused by the condition that both ends of the tubular product sample are flatly clamped, thereby obtaining the accurate tensile property of the tubular product and having the characteristics of simple structure and convenient and reliable use.

The invention provides a welding method for a target assembly. The welding method is used for welding a target and a back plate to form the target assembly. The method includes the steps that the back plate and the target are provided; molten solder is arranged on a welding face of the back plate; a steel brush is used for wetting the welding face of the back plate and the molten solder, and ultrasonic waves are used for processing the welding face of the back plate and the molten solder; the steel brush is used for processing a welding face of the target; and the welding face of the target and the welding face of the back plate are attached so as to weld the target and the back plate. The welding method has the beneficial effects that the contact area between the molten solder and the welding face of the back plate is enlarged, atoms of the solder can be conveniently and more quickly dispersed onto the welding face of the back plate, and therefore the molten solder can conveniently wet the surface of the welding face of the back plate, and the welding quality of the target and the back plate is higher.

The invention discloses a pump driven by a brushless direct current motor, a pump equipped with the brushless direct current motor as well as a manufacturing method of the brushless direct current motor for driving the pump. The brushless direct current motor of the pump comprises a motor shell and a motor shaft, wherein the motor shell comprises a lower end cover and an upper end cover, a statorpart is fixed between the lower end cover and the upper end cover, the motor shaft passes through the lower end cover and extends downwards, surrounding edges extending upwards are arranged at the periphery of the upper end cover, a circuit board chamber is arranged at the upper side of the upper end cover and is internally provided with a control circuit board and an encapsulating body made of encapsulating material, an internal lead of the control circuit board is connected with a connecting wire of the motor after passing through an internal lead hole on the upper end cover, and an external lead of the control circuit board passes through the encapsulating body and extends outwards. The control circuit board is sealed in the circuit board chamber in the way of encapsulating, and the encapsulating body can protect the control circuit board, ensure the reliability of motor control and operation, simplify the structure of the motor and facilitate the assembly of the motor.

The invention relates to a dry-type joint coal rock sampling device and a sampling method thereof. The dry-type joint coal rock sampling device comprises a cutting device and a sampling device, wherein the cutting device is provided with a cutting base, one end of a cutting wall is connected with the cutting base, a saw blade is mounted on the other end of the cutting wall, and a height regulating device is mounted between the cutting base and the saw blade; the cutting base further comprises a cutting track; a sliding rail base is connected with the cutting track, the sliding rail base is a two-way sliding rail and capable of moving along the cutting track or in a direction perpendicular to the cutting track, and a base translation control handwheel is mounted on the sliding rail base; a turnplate is mounted at the center of the sliding rail base and is provided with a handwheel, and rock samples are arranged on the turnplate; the sampling device comprises a sampling base, a clamping device, a diamond sampling drill bit, an openable transparent cover, a refrigerating device, an air blowing device and an exhaust fan. The dry-type joint coal rock sampling device is capable of either effectively avoiding coal briquette falling and coal rock cracking due to instability in the coal rock cutting process or accurately controlling the cutting thickness of the coal rock, and therefore, the purpose of accurate cutting is achieved.

A vibration damping device capable of reducing a change in an order frequency of a reciprocating motion of a pendulum resulting from eccentricity of rotational members therein. The vibration damping comprises a pendulum damping mechanism having a mass to dampen the torsional vibrations by an oscillating motion thereof resulting from the torsional vibrations. An inertial body is arranged in the prime mover side of the rotary shaft, an elastic damping mechanism is connected with a transmission side of the inertial body in a power transmittable manner, a pendulum damping mechanism is connected with the transmission side of the elastic damping mechanism in a power transmittable manner, and a torque limiter mechanism is connected with the transmission side of the pendulum damping mechanism in a power transmittable manner.

The invention relates to a refrigerator. The refrigerator includes a cabinet (10) in which an upper storage space and a lower storage space are defined, a door part (31) inserted and withdrawn to openand close the lower storage space, a drawer part (32) connected to the door part so as to be inserted into and withdrawn from the lower storage space, a support member (35) which is provided in the drawer part and on which a food or container is seated, and an elevation device (51) disposed on each of both side surfaces of the drawer part (32) and coupled to each of both side ends of the supportmember (35) to vertically elevate the support member in a state in which the drawer door is withdrawn.

A spark plug in which a glaze is applied to a rear trunk portion (245), a shoulder portion (240), and a portion of a intermediate diameter portion (230) of an insulator (200), and glaze firing is performed. Even when the glaze (shown by dots in the drawings) softened by heating flows downwards, the glaze is accommodated within a groove portion (235) formed between the shoulder portion (240) and the maximum diameter portion (210), and does not reach the maximum diameter portion (210). Such structure facilitates assembly of the insulator (200) to a metallic shell in a spark plug manufacturing process.

The invention discloses a hydraulic flexible cold-drawing method and equipment in the metallurgical mechanic pipe moulding technique, which comprises the following parts: pushing piston cylinder, pushing core bar cylinder, pushing assembly cylinder, assembly, rail, feeding structure, mould, blanking structure, clamp structure and drawing cylinder. The mould doesn't touch the deformation metal to form the flexible deformation state of mould-hydraulic oil-hollow billet-hydraulic oil-core head, which improves the precision of cold-drawing pipe.

The invention relates to a beam tester of the bonding strength of fibre reinforced composite sheet and concrete. The tester comprises a front compression bar altitude controller, a back compression bar altitude controller, a compression bar, a distributive girder and a steel girder, wherein the distributive girder is arranged above the steel girder, the front and back compression bar altitude controllers are arranged on the sides of the steel girder, the steel girder is connected with a pair of hinge parts, each hinge part is provided with an hinge hole, the inside of the hinge hole is provided with a hinge bar; the front and back compression bar altitude controllers adopt the altitude controllers, each altitude controller contains a base provided with connection holes and a compression bar hole; the inside of each connection hole is provided with a connection bolt, the base is also provided with an upper support and a lower support, a compression bolt is arranged in the upper support, an adjusting bolt is arranged in the lower support; the compression bar hole is arranged between the upper support and the lower support, the compression bar is inserted in the compression bar holes of the front and back compression bar altitude controllers and arranged between the compression bolt and the adjusting bolt, and the front and back compression bar altitude controllers and the pair of hinge parts are arranged on the same side of the steel girder.

The invention discloses an electronic expansion valve. A sleeve (4) is fixed in a main valve cavity (11), a valve core seat (2) is movably arranged in the sleeve (4) axially, a sleeve runner (41) is arranged on the peripheral side wall of the sleeve (4), and a valve core seat side hole (24) is formed in the peripheral side wall of the valve core seat (2). When a refrigerant is in forward flowing, the valve core seat (2) closes a main valve port (441) to break off communication between the sleeve runner (41) and the valve core seat side hole (24), and the refrigerant flows to a valve core valve port (21) through the sleeve runner (41); when the refrigerant is in backward flowing, the valve core seat (2) is moved upwards to open the main valve port (441) to communicated the valve core seat side hole (24) with the sleeve runner (41); when the refrigerant is in forward flowing, by the structural design of the electronic expansion valve, high-pressure refrigerant can be avoided from causing overlarge impact on the valve core seat, and eccentric phenomena of the valve core seat can be prevented.

This tolerance ring, which is for a torque transmission device, preferably has a ring body that comprises an elastic plate and is roughly a hollow cylindrical shape having a pair of edges that extend in the axial direction. The ring body has: a plurality of protrusions that are arranged along the peripheral direction and preferably protrude in the radial direction; a first region having a number of the protrusions including the pair of protrusions adjacent to the pair of edges; and that is positioned at the diametrically opposite side from the first region. The pair of protrusions has the same rigidity as one of the protrusions of the second region.

For manufacturing a high-pressure discharge lamp, a tungsten electrode is welded to a molybdenum foil by bringing a shaft of tungsten electrode into close contact with the molybdenum foil, and by irradiating a laser light, having a metal melting wavelength, to a junction of the molybdenum foil with the tungsten electrode from a location closer to the molybdenum foil to melt both the molybdenum foil and the shaft of the tungsten electrode for bonding.

The invention discloses a concrete performance testing device under the combined action of a constant tensile load and an erosion medium, relates to the field of concrete durability testing and solves the problem that an existing testing device cannot implement concrete performance testing under the combined action of a constant stress and medium erosion. The testing device comprises a bottom plate, a connecting base, a first puller, a middle pressure plate, an upper pressure plate, a pull rod, a dish-shaped spring and a medium circulating device, wherein the bottom plate is fixedly connected with an upright; the connecting base is fixed in the middle of the bottom plate; the first puller is hinged to the connecting base and can rotate around the connecting base; the middle pressure plate passes through the upright and is fixed at a limiting point of the upright; the upper pressure plate passes through the upright; the pull rod passes through through holes in the middle pressure plate and the upper pressure plate; one end of the pull rod is connected with a spherical joint; a second puller is connected to the spherical joint; a nut is screwed at the other end of the pull rod; the dish-shaped spring sleeves the pull rod and is positioned between the middle pressure plate and the upper pressure plate; one end of a concrete test piece is connected to the first puller and the other end of the concrete test piece is connected to the second puller.

A protruding section facing a drive pinion shaft is integrally provided on (or provided as a separate component) a tubular spacer interposed between an inner race of a pilot bearing and an inner race of a tapered roller bearing at an inner section opposite to the drive pinion shaft. In one embodiment, a monolithic protruding section is curved so as to be convex along the overall central axial direction of the spacer, and is arch shaped in cross section. The protruding section protrudes towards the drive pinion shaft along the overall inner peripheral direction of the spacer, and the inner surface of the protruding section comes into contact with or close to the outer surface of the drive pinion shaft. Additional positions include one or a plurality of O-rings interposed between the drive pinion shaft and the inner surface of the tubular spacer.

The invention discloses an all-fiber-texture large-size one-piece flange fan main shaft forging method which comprises the following steps of material selection, heating, primary firing forging, secondary firing forging, heat treatment after forging, rough turning, ultrasonic flaw detection, hardening and tempering, semifinishing, lossless flaw detection, body sampling, mechanical property testing and stable heat treatment. Compared with the conventional twice-forging and welded flange main shaft production method, the all-fiber-texture large-size one-piece flange fan main shaft forging method has the advantages that the welding working procedures are reduced, the time is saved, the raw material consumption is reduced, and the production cost is lowered; a forged flange main shaft is of an all-fiber-texture structure, so that the natural defects that the welded flange is low in balance property and easy to deform and the root is easy to break are totally overcome; a requirement of a large-size fan on the main shaft design is met.

The invention provides a PSD-based deep hole linearity measuring robot, which comprises an advancing mechanism, a deep hole self-centering mechanism, a laser measuring head, a photoelectric processing system, and a PSD position adjusting mechanism. The deep hole self-centering mechanism comprises a sleeve, an end cap, six support measuring rods, two conical circular truncated cones, a press spring, and a centering shaft. The advancing mechanism is used for pushing the deep hole self-centering mechanism to advance along a deep hole. The laser measuring head is arranged on the other end of the centering shaft. The photoelectric processing system is used for acquiring laser signals of the laser measuring head. The PSD position adjusting mechanism is used for adjusting light receiving positions of the photoelectric processing system. A bidirectional symmetrically wedge-form elastic supporting mechanism is realized, ends of the support measuring rods are supported in a sliding manner, and the conical circular truncated cones are pushed to slide along the centering shaft when the support measuring rods shifts in a radial direction to adapt to changes of the aperture of the hole. Moreover, the central line of the hole and the central line of the centering shaft are always the same line so as to match linearity measuring of the deep hole or a blind hole.

The invention discloses a manufacturing process of a three-layer co-extrusion nano-modified BOPP matt film. The manufacturing process comprises the following steps: after mixing and drying raw materials of a coring layer, an upper surface layer and a lower surface layer, entering respective single screw extruders to carry out melt plastification, and then entering a die head through a filter and a metering pump; flowing out after converging a three-layer polymer melt at the position of the die head, quickly attaching to the surface of a quenching roller under the effect of an air knife attaching device, forming a solid sheet through quick cooling of the quenching roller and a water channel, then carrying out longitudinal and transverse stretching in sequence, and then instantly carrying out air cooling treatment; then subsequently carrying out online thickness measurement, boundary material cutting, static elimination, automatic rolling, aging treatment and slitting. The manufacturing process adopts a three-layer co-extrusion compounding technology, the BOPP matt film with high extinction property, good abrasion resistance and high rate of finished products is prepared by using an improved raw material formula.

Provided is a condenser microphone unit that prevents eccentricity as much as possible and achieves improvement of assembly accuracy. A condenser microphone unit including a diaphragm that vibrates upon receiving a sound wave and made by a plurality of configuration components that are assembled, the condenser microphone unit includes a base member including an opening portion to which the plurality of configuration components is attached, and an adjustment member having an outer diameter corresponding to a diameter of the opening portion, and mounted to a side surface of one or more components accommodated in the opening portion, of the plurality of configuration components. The adjustment member is a frame body exhibiting an annular shape and including a notch portion notched to have a pair of end portions, and is fixed in the opening portion in a state of being mounted to the side surface of the one or more components.

The invention discloses an electromagnetic type active vibration absorber which comprises two permanent magnets, a skeleton, two enamelled coils, an insulating sealing shell, a wiring port, two shaft bossings, an ejector pin, screws, two metal springs, a cover plate, a shell and a mass block; the shaft bossings are installed at the two ends of an inner ring of the annular skeleton; the permanent magnets are adhered to the periphery of the skeleton; the enamelled coils are encapsulated in the insulating sealing shell and installed in the shell; the metal springs are of a spring sheet structure with a center hole, are installed on the cover plate in a pressing manner and are installed at the two ends of the shell respectively; the lower end of the ejector pin penetrates through the two shaft bossings and the center holes of the metal springs and is fixed to the metal springs through the screws; the mass block is installed at the upper threaded end of the ejector pin; and the wiring port is adhered to the end of the insulating sealing shell so as to derive the enamelled coils out to be connected with a controller. The electromagnetic type active vibration absorber can better meet the vibration attenuation needs of low-frequency vibration and high-frequency vibration and also has the advantages of compact structure, small energy consumption, sensitiveness in respond, convenience in mounting, strong reliability and the like in engineering application.

The invention discloses a cross rod middle forming die. The forming die comprises: a convex die which is used for punch forming, wherein, the convex die is fixedly arranged on an upper die plate by an upper die holder; a concave die which is matched with the convex die, wherein, the concave die is fixedly arranged on a lower die plate by a lower die holder; and a pair of liftable follow-up positioning devices which are used for positioning a workpiece to cause the axis of the workpiece and the longitudinal center line of the concave die to be kept at the same vertical plane, wherein, the pair of the positioning devices are respectively arranged at two ends of the concave die. The axis of the workpiece is automatically kept at the same vertical plane with the longitudinal center line of the concave die when the workpiece is placed on the positioning devices before forming, and the convex die moves downwards along with the upper die plate to form the workpiece, which can avoid the quality problems that the eccentric centers and microcracks and the like are formed in the workpiece forming, and improve the fatigue property of a cross fabrication device.