34results about How to "Accurate preload" patented technology

The invention discloses a method and device for on-line monitoring and pre-tightening force application of assembly of a sandwich type longitudinal vibration transducer. A spiral groove with a spiralstructure is formed in a conical transition section of an amplitude transformer. The transducer is composed of four piezoelectric ceramic sheets, four electrode sheets, a rear end cover and connectingbolts. The polarization directions of two adjacent piezoelectric ceramic sheets are opposite and have the same positive and negative characteristics. The electrode sheets are connected in pairs, thepositive electrode sheet is connected with the positive electrode sheet, and the negative electrode sheet is connected with the negative electrode sheet to form two pairs of electrodes which are symmetrically distributed at 180 degrees. The two pairs of electrode sheets are symmetrically and evenly distributed in two wall grooves at the upper end of a die, a flange of the amplitude transformer isconnected with the die through a threaded tabletting under the die, the two pairs of electrode sheets are separately connected with two jointing clamps of an impedance analyzer, a computer is separately connected with the impedance analyzer and a mechanical arm, and a torque wrench is arranged at the outer end of the mechanical arm. According to the method and device for on-line monitoring and pre-tightening force application of the assembly of the sandwich type longitudinal vibration transducer, a closed loop is formed, data are continuously generated, collected, processed and transmitted, sothat various parameters, instructions and actions are continuously optimized, and the target of pressing the transducer is achieved.

The invention provides a method and a device for exerting an anchor rod pretightening force and is suitable for general tunnel and roadway surrounding rock timbering engineering. During anchor rod pretightening force exerting, an anchor rod drilling hole is firstly constructed through a drilling machine, a resin medicine roll and an anchor rod are filled in the drilling hole sequentially, and a tray and a nut are sleeved on an external road section of the anchor rod. A pneumatic rock drill drives the anchor rod to rotate so as to break the medicine roll, and strength can be formed when the medicine roll is solidified; a hydraulic tensioner is installed; a hydraulic cylinder is started to exert a tension pretightening force on the anchor rod, and a suspended nut is screwed in by a wrench to be contacted with the tray; and the pressure of the hydraulic cylinder is reduced to be zero, and the hydraulic tensioner is removed. By means of the method and the device for exerting the anchor rod pretightening force, anchor rod pretightening force construction can meet the design requirements easily, the process that a traditional torque circumferential force is converted into an axial force in an anchor rod pretightening force construction method is changed, requirements on materials of the anchor is reduced, damage to the anchor rod is avoided, and the construction efficiency is improved.

A two-stage slide valve electro-hydraulic servo valve driven by a giant magnetostrictive actuator belongs to the technical field of hydraulic servo control. The two-stage slide valve electro-hydraulic servo valve comprises a valve body (26), a main valve plug (5), a pilot valve plug (6), a giant magnetostrictive actuator, a micrometric displacement amplifier located between the giant magnetostrictive actuator and the pilot valve plug (6); the above giant magnetostrictive actuator comprises a thermal compensation cover (12), a giant magnetostrictive rod (13) arranged in the thermal compensation cover, a coil framework located at the external side of the thermal compensation cover (12) and a drive coil (4) and a bias coil (3) which are wound around the external side of the coil framework (2) in sequence; and the servo valve has the characteristics of large drive power and quick response speed.

The invention provides a space flexible arm end tool box compression and anti-radiation protection mechanism, which belongs to the technical field of tool box compression and anti-radiation protection. In the present invention, the anti-radiation cover is connected to the transmission shaft through screws; the position detection microswitch, the bearing seat and the L-shaped motor seat are connected to the fixed base through screws; the left end of the transmission shaft is connected to the drive motor and The reducer components are connected, the drive motor and reducer components are connected to the L-shaped motor base through bolts through the heat insulation pad; the limit micro switch is connected to the bearing base through screws, and deep groove ball bearings are installed on the bearing base, and the drive shaft passes through the left Positioning parts such as bearing end cover, right bearing end cover and shaft sleeve are installed on the bearing. The present invention can apply more accurate pre-tightening force, is convenient for assembly and adjustment, and when unlocking, there is no impact or vibration; it can realize the smooth entry and exit of the end tool box and radiation protection; it can prevent the end of the flexible arm from being affected by a large inertial force was thrown out.

The invention discloses an automobile active type pre-tightening safety belt, and belongs to the technical field of passenger injury protection during automobile collision accidents. The safety belt comprises a direct current motor, a transmission system, a retractor and a weaving belt kit, wherein the direct current motor is connected with the transmission system, and responds to a control signal of an accident pre-tightening device to work, the transmission system is connected with the direct current motor, and the decelerated power of the motor is transmitted to a one-way device and the retractor. The safety belt has the advantages that a weaving belt double-side pre-tightening structure is adopted, so the safety weaving belt can be simultaneously retracted at the shoulder belt part and the waist belt part to reach the double-side pre-tightening purpose, the wearing gap between a shoulder belt and a waist belt is eliminated, the body forward movement amount of a passenger during collision accidents is obviously reduced, and the slippage of the passenger is prevented; by integrating the force limiting and emergency locking functions, the collision injury to the passenger is minimized.

The invention belongs to the technical field of pushing pre-tightening devices, and particularly relates to a locknut pushing pre-tightening system. The system comprises a fixed base; a main nut, a pushing sliding piece, an auxiliary nut, and a main bolt are included; the main bolt is arranged on a connected part, the main nut is provided with a first thread hole, a thread groove is formed in thebottom end of the main nut, a second thread hole is formed in the auxiliary nut, a mounting groove is formed in the upper end of the auxiliary nut, the main bolt is sleeved with the pushing sliding piece, a first outer thread and a second outer thread are arranged on the outer side of the pushing sliding piece, a pushing spring is arranged in the mounting groove, the top end of the pushing slidingpiece is in threaded connection with the thread groove through the first outer thread, the bottom end of the pushing sliding piece is in threaded connection with the mounting groove through the second outer thread, and the bottom end of the pushing sliding piece is in contact fit with the pushing spring. The phenomenon that when the connected part vibrates, the main bolt loosens can be avoided; and firm connection of the main bolt and the main nut can be improved, and loosening can be avoided.

The invention relates to a test tooling for a tapered bearing and a mounting method for the tapered bearing and belongs to the technical field of bearing mounting. The tapered bearing (3) is horizontally placed in a cylindrical seat (2), a step (101) contacts with the upper end face of an inner ring (301), a pressure-bearing mechanism contacts with the lower side of an outer ring (302), the matching mode between the lower portion of a pressing shaft (1) and the tapered bearing (3) is the same as the matching mode between the tapered bearing (3) and a shaft (4), and the matching mode between the cylindrical seat (2) and the tapered bearing (3) is the same as the matching mode between the tapered bearing (3) and a box. Firstly, the axial relative displacement between the inner ring (301) and the outer ring (302) is measured by using the test tooling of the tapered bearing, then, the absolute expansion of the shaft (4) where the tapered bearing (3) is located relative to the box in a working state is calculated, and the maximum preloading quantity of the tapered bearing (3) is determined. The test tooling for the tapered bearing and the mounting method for the tapered bearing have the advantages that measurement results are accurate, the preloading quantity is accurate, the mounting accuracy of the bearing is high, and the like.

The invention relates to a combined type self-reaction-force locknut with a high-precision torque coefficient. The combined type self-reaction-force locknut comprises a slotted nut, a gasket and a thread ring. When a working bolt is in a tightened state, the thread ring is embedded between the gasket and the bolt in the form of a wedge-shaped ring, and connection between the working bolt and the nut is effectively prevented from loosening. According to the combined type self-reaction-force locknut, in bolt and nut connection in the mechanical industry, mounting is achieved at the level of the small friction coefficient to obtain precise bolt pre-tightening force, and the anti-loose function is kept all the time in the equipment operating process. According to the combined type self-reaction-force locknut, in the equipment operating process of the mechanical industry, especially the petroleum and petrochemical industry, the power generation industry, the offshore wind power industry, the nuclear power industry, the high-speed rail industry, the bridge industry and the like, the reliability and safety of bolt and nut connection are greatly increased, and therefore the frequency of manual point detection and maintenance of bolts and nuts is greatly reduced. By means of scale use and popularization of the combined type self-reaction-force locknut, unlimited economic value can be generated.