4 results about "Washer" patented technology

The invention relates to a bearing preload adjusting and locking structure for a small and special electrical machine and an implementation method. The bearing preload adjusting and locking structureincludes a rotor, a stator, a first bearing, a second bearing, a lock nut, a bearing washer, a bearing outer ring gasket and a bearing inner ring gasket, wherein the outer ring cylindrical surfaces ofthe two bearings are in contact with the cylindrical surface of a rotor shaft sleeve inner cavity; the outer ring inner end surfaces of the two bearings are in contact with the two end surfaces of arotor shaft sleeve stop; the bearing washer is assembled between the inner rings of the two bearings; the bearing outer ring gasket is installed between the first bearing and the rotor shaft sleeve stop; the bearing inner ring gasket is installed between the first bearing and the bearing washer; the lock nut is disposed on the outside of the first bearing and is in threaded connection with a stator output shaft; the threaded joint is coated with anti-loose paint; the boss at the inner end of the lock nut is in close contact with the inner ring of the first bearing; and four blind holes are machined at the outer end of the lock nut. The bearing preload adjusting and locking structure solves the problems that the locking torque of the electrical machine is uneasy to control and poor in stability, and the preload changes greatly after a strong impact.

The invention provides a structure and load transfer integrated composite material four-point bending loading clamp and a using method, and relates to the technical field of composite material load and environment coupling service conditions. The clamp comprises a bottom plate, supports, a pressure head, long screws, springs, flat washers and nuts, wherein the two supports are in close fit with the bottom plate through screws, the two long screws are in close fit with the bottom plate through threads, the pressure head is in loose fit with the two long screws and can freely slide up and down, the long screws are sleeved with the springs, the springs are arranged above the pressing head, the flat washers are arranged at the top of the sides, which are away from the pressure head, of the springs, and the nuts transmit stable loads to the springs through the flat washers. Under the condition that other electronic equipment is not needed, accurate and quantitative four-point bending loads are provided for a composite material sample in an extreme environment, a simulation test that the material bears the long-time stable accurate four-point bending loads in different service environments is completed, and the four-point bending clamp is small in size, simple in structure, resistant to corrosion, not prone to damage, and capable of achieving certain loading precision. The loading using method is simple, the application range is wide, and testing conditions and steps can be automatically adjusted according to different samples and service environment requirements.

There is provided an abnormality detection device and a fixing structure which are suitable for detecting an abnormality of a fastener such as a bolt or a nut. An abnormality detection device detects an abnormality of a fixing structure including a bolt, a nut, and a washer which include a conductor and fix steel plates to each other, and a spacer which includes an insulator and is disposed between the steel plates and the washer, the abnormality detection device including: a transmission antenna that radiates electromagnetic waves to the fixing structure; a reception antenna that receives electromagnetic waves reflected by the fixing structure; and an abnormality detector that changes a frequency of the electromagnetic waves radiated from the transmission antenna to acquire frequency characteristics of standing waves received by the reception antenna and detects an abnormality of the fixing structure by comparing the frequency characteristics with frequency characteristics in a normal state.

The invention belongs to the field of dust falling and environmental protection, and provides a rapid replacement device suitable for a dust falling nozzle on a mine continuous mining machine. The invention relates to a nozzle core assembly and a nozzle holder. The nozzle core assembly is composed of a nozzle core 1, a hexagon nut 2, a rubber gasket 3 and a fastening pin 5. The two ends of the fastening pin 5 are placed in the corresponding L-shaped groove channels in the nozzle base 4, installation of the nozzle is completed through clockwise screwing, and disassembly is completed through anticlockwise screwing. The fastening pin penetrates through the nozzle core, the nozzle core assembly is tightly connected with the nozzle seat 4, and the nozzle core is prevented from loosening and falling off due to mechanical vibration or external force. And the rubber gasket 3 is used for preventing the nozzle core and the nozzle seat from directly contacting to cause abrasion at the contact part, and also plays a sealing role. The whole device is made of stainless steel materials, and corrosion is prevented. The device has the advantages that a matching structure of the nozzle and the nozzle holder is designed, so that quick mounting and dismounting are realized when the nozzle is replaced, and the device is time-saving, efficient and reliable.