46results about How to "Guaranteed to follow" patented technology

According to an aspect of the present invention, there is provided a power tool including: a motor; a driving circuit that supplies an electric power from a power supply to the motor; a control part that sets a target rotation number for the motor in accordance with a mode selected from a plurality of modes, each mode having a corresponding target rotation number; and a voltage detecting circuit that detects a voltage of the power supply, wherein the target rotation number is varied based on the detected voltage.

The invention aims at providing a slide vane compressor. The problem that backpressure oil supplying of an existing slide vane compressor is not stable is mainly solved. According to the technical scheme, negative pressure is generated in a main oil way in a spindle through a fan, and then an upper oil tube assembly is used for pumping oil from an oil pool; a backpressure oil tank is communicated with the main oil way, and the main oil way supplies pressure oil to the backpressure oil tank. Through the arrangement, oil supplying of the backpressure oil tank is more stable and reliable.

The present invention relates to an unmanned vehicle path-following method based on event-triggered model predictive control. The event-triggered mechanism de-redundantly processes the solution to the optimization problem to determine whether the vehicle's control strategy is updated; the model predictive controller uses the position information, combined with the state constraints and input constraints in the vehicle's global coordinate system, to solve the optimal control strategy. The present invention introduces an event trigger mechanism, which can reduce the calculation amount and ensure the follow-up of the reference path. Compared with the traditional periodic sampling control, the event trigger mechanism only acts when a predetermined event occurs, such as the error exceeds the threshold or reaches the At a specific moment, the path following control is realized, and the amount of calculation is greatly reduced at the same time.

The invention relates to a mechanical sealing device. The mechanical sealing device comprises a sealing box, a dynamic ring base with a dynamic ring and a static ring base with a static ring, wherein a pushing ring is arranged between the static ring base and the sealing box; the dynamic ring base is in fastening connection with a shaft sleeve through a fastening bolt, and the dynamic ring base and the shaft sleeve rotate together; a supporting space is reserved between the inner wall of the static ring base and the outer wall of the shaft sleeve; a static ring radial regulating mechanism which overcomes the problem that the static ring and the static ring base sink as a result of gravity is mounted in the supporting space; and an external adjustable type static ring axial compensating mechanism is arranged on the outer end surface of the sealing box. The mechanical sealing device solves the problem that the dynamic ring and the static ring are not concentric as a result of gravity of a large-shaft-diameter mechanical seal compensating static ring, and the problem that friction force in the circumferential axial direction is not uniformly distributed due to the fact that circumferential clearances of a seal ring between the static ring and the static ring base are not uniform, and the like; and meanwhile, the mechanical sealing device has the advantages that: for a split type mechanical seal and an integrated type mechanical seal, working strength, in a mounting using process, of a spring does not change due to regulation of a pump body, and in use, a damaged spring element can be timely replaced without dismounting equipment.

The invention relates to an external stationary ring axle compensation mechanism for a mechanical sealing device. The external stationary ring axle compensation mechanism comprises a movable ring base which is installed in a sealing box and provided with a movable ring, a seal washer achieving floatation sealing and a first anti-rotating pin preventing rotation are arranged between the movable ring and the movable ring base. An external adjustable stationary ring axle compensation mechanism body is arranged on the outer end face of the sealing box. The external adjustable stationary ring axle compensation mechanism body comprises a gland arranged at the outer end of the sealing box, and the gland is connected with the outer end face of the sealing box through a bolt. An adjusting shim is arranged between the gland and the outer end face of the sealing box. Stationary ring compensation assemblies are evenly distributed in the circumferential direction of the outer end face of the sealing box. According to the structure, elastic components can be adjusted and replaced at will under the situation that the whole device is not dismounted, and the specific pressure of the sealing end face reaches a designed ideal value; and moreover, the concentricity and the following performance of the movable ring and the stationary ring are effectively guaranteed, the sealing effect is improved, and the service life is prolonged.

The invention discloses a compressor and a matching structure of a roller and a sliding plate of the compressor. According to the matching structure of the roller and the sliding plate, the outer circumferential face of the roller is provided with annular protrusions or annular grooves extending in the circumferential direction; and the end, making contact with the roller, of the sliding plate is provided with grooves matched with the annular protrusions, or protrusions matched with the annular grooves. In this way, the matching structure of the roller and the sliding plate of the compressor, the problem that in the prior art, a sliding plate and a roller are separated can be avoided.