30results about How to "Reduce alternating stress" patented technology

The invention discloses a directional rotating guide drilling tool. The directional rotating guide drilling tool comprises an outer barrel upper section and an outer barrel, wherein a drill stem and a mandrel are sequentially connected to the outer barrel upper section and the outer barrel from the top to the bottom, the drill stem is connected with the mandrel through a hollow cardan joint, the drill stem is in rotating connection with the outer barrel upper section through a cylindrical roller bearing, a pressure relief cavity positioned in the outer barrel is arranged at the lower end part of the drill stem, the pressure relief cavity is communicated with a draining hole in the drill stem, a biasing mechanism and a knuckle bearing assembly which are positioned in the outer barrel are respectively arranged at the upper end part and the middle of the mandrel, the pressure relief cavity is communicated with the biasing mechanism through a guide pipe, and a drill bit is fixedly connected to the lower end of the mandrel. The biasing of the mandrel is realized by an integrated hydraulic cylinder. The use of the tool is not affected by geological stratification, so that stable and higher drift angle buildup can be obtained. Various work states can be realized without lifting the drill.

A lifting device (1) for lifting and lowering a load (7) in a known manner comprises a lifting drum (2) drivable in both directions and at least one strap (8) used as a traction device ), said strap is fixed at one end to the lifting drum (2) and has a holding device (9) for the load on the other end. The tape (8) can be wound on the drum (2) by rotating the lifting drum (2) in such a way that one loop is superimposed on the other. In order to reduce the mechanical alternating stress at the step formed by the end (15) of the strap (8) fixed on the circumferential wall of the lifting drum (2), on the circumferential wall of the lifting drum (2) At least one spacing element (17) is provided against which the first turn of the strap (8) rests.

A lifting device for raising and lowering a load comprises in a known manner a lifting drum that can be driven in both directions of rotation, as well as at least one belt serving as traction mechanism that is secured to one end of the lifting drum and carries at the other end a holding device for the load. The belt can be wound on the lifting drum by rotation of the latter, in such a way that the windings come to lie on top of one another. In order to reduce repeated mechanical stress reversals at the step that is formed by the end of the belt secured to the circumferential wall of the lifting drum, at least one spacing element is arranged on the circumferential wall of the lifting drum, against which element rests the first winding of the belt.

The invention provides a molten salt constant temperature system and its use method, comprising a molten salt tank, a constant temperature working salt tank and a water heat exchange system, the constant temperature working salt tank is provided with a salt-salt heat exchanger, the outlet of the molten salt tank is connected The heat exchange system is connected, the outlet of the water heat exchange system is connected with the salt-salt heat exchanger, and the outlet of the salt-salt heat exchanger is connected with the molten salt tank. The invention utilizes the low-temperature molten salt to take away the heat of the high-temperature molten salt in the working salt tank, and converts the excess heat into high-temperature steam, thereby achieving the purpose of constant temperature control of the working molten salt, ensuring that the temperature fluctuation of the molten salt is between ±2°C, and at the same time Realized waste heat recovery and utilization. The invention is safe, reliable, simple in structure, stable in performance, energy-saving, environment-friendly and low in cost. By installing a pre-heater between the water supply device and the steam drum, the temperature of the water entering the steam drum can be increased to ensure the good operation of the evaporator; at the same time, it can effectively reduce the fluctuation of the water level in the steam drum, reduce the temperature difference between the upper and lower walls of the steam drum, and reduce the exchange of metals. Variable stress, improve equipment life.

The invention relates to a monometallic compound seal structure for a roller bit. The monometallic compound seal structure for the roller bit is widely used in rotating dynamic seal of oil and gas andmining downhole power tools to prevent oil leakage inside a bearing and prevent external mud from entering the bearing. The monometallic compound seal structure for the roller bit is mainly composedof a dynamic seal ring, a static seal ring, an X type rubber sealing ring, a support ring and a palm shaft journal. According to the technical scheme, the outer end part of a cone inner hole in whichthe dynamic seal ring is located and the root portion of the palm shaft journal constitute a seal cavity, and a monometallic compound seal device formed by the dynamic seal ring, the static seal ring,the X type rubber sealing ring and the support ring is placed into the seal cavity; the dynamic seal ring is in interference fit with the cone inner hole, and the contact face of the dynamic seal ring and the static seal ring is a sealing face; and the X type rubber sealing ring is compressed inside the support ring by the static seal ring. The monometallic compound seal structure for the rollerbit improves the monometallic seal structure, increases the seal reliability, increases the heat dissipation area, improves the wear resistance and prolongs service life.

The invention relates to an electric spindle structure suitable for longhole inner circle processing. The electric spindle structure comprises a motor shell (13), a motor rotor (9), a motor stator (8), a motor spindle (7), and a motor front bearing (6) and a motor front bearing seat (12) which are used for supporting the motor spindle (7), a motor rear bearing (10) and a motor rear bearing seat (11), a grinding spindle shell (3), a grinding spindle (2), a grinding wheel front bearing (1) and a grinding wheel rear bearing (2) which are used for supporting the grinding spindle (2), and a coupler (5) which is connected with the grinding spindle (2) and the motor spindle (7); and the electric spindle structure is characterized in that: the motor stator (8) is arranged in the motor shell (13);and the motor spindle (7) is arranged at the axial line position in the motor shell (3). The processing accuracy and assembly accuracy of the spindle structure can be guaranteed.