10results about How to "Reduce damping force" patented technology

This invention belongs to the field of pneumatic control valve technology, specifically providing a pneumatic shut-off valve. The invention aims to solve the problem of excessive noise during operation of existing pneumatic shut-off valves. To this end, the pneumatic shut-off valve of this invention includes a valve body assembly, a valve core assembly, and a bidirectional damping assembly. This invention defines a distal variable volume cavity and a proximal variable volume cavity located on opposite sides of the axial direction of the movable yoke by having the valve core assembly and the valve body assembly jointly define such cavities. A connecting channel is provided within the valve core assembly to connect the distal and proximal variable volume cavities. By configuring a pressure-controlled air guide orifice and a damping channel communicating with the air guide orifice in the bidirectional damping assembly, the gas flow velocity between the distal and proximal variable volume cavities is limited. This not only weakens the impact force of the valve core assembly on the valve body assembly, reducing the noise during pneumatic shut-off valve operation, but also ensures the response rate of the valve core assembly when moving in one direction.

The invention discloses a vehicle knob control method, a controller, a vehicle, a medium and a program product, and relates to the technical field of vehicles. The knob comprises a knob part and a force feedback motor, the force feedback motor is connected with the knob part, and the force feedback motor is configured to provide rotation damping force opposite to the rotation direction of the knob part; the vehicle knob control method comprises the steps that the real-time state of a knob part is obtained; the real-time state comprises a real-time rotation speed; determining a target output damping force of the force feedback motor according to the real-time rotation speed; wherein the value of the target output damping force is in negative correlation with the real-time rotation speed; and adjusting driving parameters of the force feedback motor according to the target output damping force. According to the invention, differentiated hand feeling feedback in different scenes can be realized, so that different tactile feedback requirements of drivers in different driving scenes can be met.

The invention relates to the field of sawing machines, and discloses a multi-shaft sawing machine capable of self-adaptive active vibration reduction. An active damping mechanism; the driving damping mechanism is arranged on the rear side of the sawing machine frame, sawing vibration is transmitted to the vibration transmission rod through the push-pull frame and the limiting cross rod in sequence through the arranged driving damping mechanism, the transmission sliding block is driven to do up-down reciprocating motion, linear motion of the sliding block is converted into rotary motion of the transmission disc through cooperation of the first swing arm and the second swing arm, and therefore the sawing machine is driven to rotate. The transmission shaft drives the transmission lead screw to rotate through the transmission belt and the bevel gear set, the lifting driving ring converts rotary motion into linear motion, then the pressing column is driven to compress or release the damping spring, vibration energy is converted into spring damping force through mechanical linkage, and the more violent vibration is, the larger the generated damping force is. Force for resisting vibration is actively generated according to working conditions to eliminate violent vibration generated when the sawing machine cuts hard materials or operates at a high speed, and therefore the flatness and the size precision of a cut section are greatly improved.

The application discloses a kind of block crystalline alkali vibrating devices, it is related to vibrating device technical field, including conveyor frame, conveying belt, vibrating frame, vibrating machine shell being set in vibrating frame inside, vibrating roller rotating in vibrating machine shell inside and vibrating motor being installed on vibrating machine shell, bagged crystal alkali is conveyed to flatten frame by conveying belt, and the agglomerate area on the surface of bagged crystal alkali can be effectively flattened by multiple rollers in flatten frame, so that the overall surface is more flat, flatten frame height is automatically adjusted with bagged crystal alkali size and drives liquid extraction cylinder to move up, and the oil in lifting rod is sucked by the negative pressure generated by closed oil circuit system, so that the sealing plug is slightly moved and exposed part of mesh, so as to reduce oil damping force and improve the vibration frequency of vibrating machine shell, the design realizes the adaptive adjustment of vibration frequency with the size change of bagged crystal alkali, compared with prior art has the advantages of improving the vibrating efficiency and uniformity of different specifications of material.

The utility model relates to the technical field of aluminum profile processing, and discloses an automobile seat aluminum profile extrusion device with high compression resistance, which comprises a mounting seat, an upper die and a lower die, the top of the mounting seat is in bolted connection with two shells, inner cavities of the two shells are provided with main hydraulic chambers, a first-stage sub-chamber is nested in the main hydraulic chamber, and a second-stage sub-chamber is nested in the lower die. A second-stage sub-cavity is embedded in an inner cavity of the first-stage sub-cavity, a first throttling hole is formed in one end of the first-stage sub-cavity, second throttling holes are formed in the two ends of the second-stage sub-cavity, a piston is slidably connected to an inner cavity of the main hydraulic cavity, and an ejector rod is fixedly connected to an inner cavity of the piston. According to the utility model, the movement speed of the ejector rod can be controlled by adopting the shell with a multi-stage hydraulic chamber structure and a multi-stage throttling design, and in the lifting process of the ejector rod, hydraulic oil sequentially passes through all stages of sub-chambers with throttling holes with different diameters to gradually consume energy, so that the movement speed of the ejector rod is effectively inhibited and adjusted.

The utility model relates to the technical field of shock absorbers, and discloses a floating piston structure for changing the damping of a shock absorber, which comprises a liquid passing shaft, a piston ring, a Teflon ring belt, a large O-shaped ring, a small O-shaped ring, an inner multi-groove valve plate, a backflow valve seat, a spiral spring and an inner multi-groove gasket, and the whole liquid passing shaft is of a rotating body structure. By means of scientific design of an oil channel and a cavity structure, accurate and controllable adjustment of damping force can be achieved, the adaptive capacity of the shock absorber to different working scenes is improved, an extra pressure relief position is avoided through the floating piston structure, and even if part of pressure is released at the position, the damping force can be accurately and controllably adjusted. However, the generated damping force is still far larger than that of an electromagnetic valve without the structure, the low-speed damping force value is effectively increased, the stability and comfort of the shock absorber during low-speed operation are remarkably improved, the floating piston structure allows sufficient oil to flow away smoothly, the damping force is further reduced, and the shock absorber is excellent in performance during high-speed operation.

The invention relates to the technical field of helicopter rotor systems, in particular to a helicopter rotor flapping limiting device which comprises a propeller hub, and a flapping limiting mechanism, a range adjusting mechanism and a double-limiting latch hook mechanism are arranged on the surface of the propeller hub in an annular array with the propeller hub as the circle center. The double-limiting lock hook mechanism comprises a first lower waving limiting lock hook, a limiting support, a second lower waving limiting lock hook, a limiting block, an extension spring and a centrifugal balancing weight which are arranged on the surface of the waving limiting mechanism. When the rotor rotates at a high speed, centrifugal force drives the centrifugal balancing weight to move, the pulling force of the extension spring is overcome, the limiting support rotates, and the first downward-waving limiting lock hook and the second downward-waving limiting lock hook are separated from the initial positions, so that the paddles can freely wave to achieve pneumatic efficiency and operation flexibility, and therefore the double lock hooks are unlocked and closed at different speeds and stages; the overcoming process of centrifugal force is divided into two stages, the action of the lock hook is in a small-angle and slow-stroke gradual change mode, the impact load is reduced, and the action stability is improved.

This invention discloses a magnetorheological fluid torsional vibration damping device and method for rotary guidance, belonging to the field of drilling engineering technology. It includes a shell and a central shaft, with a damping cavity formed between the inner wall of the shell and the outer wall of the central shaft. The damping cavity is filled with magnetorheological fluid. An inertial damping unit is arranged within the damping cavity, comprising a gear bearing and an electromagnetic damping mechanism. The electromagnetic damping mechanism includes an electromagnetic coil, a magnetically conductive outer ring, and a magnetically conductive inner ring. An annular groove is provided on the outer wall of the shell opposite the gear bearing, into which the electromagnetic coil is embedded, and the magnetically conductive outer ring is fixed. The magnetically conductive inner ring is embedded on the inner wall of the central shaft opposite the gear bearing. An axis acceleration sensor and a gyroscope are mounted on the central shaft. This invention obtains the vibration intensity and viscosity-slip vibration index at the current sampling moment, changes the current in the electromagnetic coil in real time, and then adjusts the damping force of the inertial damping unit by adjusting the viscosity of the magnetorheological fluid.

This invention discloses a band saw for cutting metal parts, including a bed, a saw frame, a band saw blade mounted on the saw frame, and a first drive mechanism. The bed has a worktable with a special clamping fixture. The fixture includes a positioning base, a floating main pressure plate, and a lateral clamping mechanism. The lateral clamping mechanism includes a drive block and a clamping block. The drive block has a first inclined surface on its side wall, and the clamping block has a clamping surface and a second inclined surface that mates with the first inclined surface. A first spring is fixedly connected between the clamping block and the positioning base. This band saw for cutting metal parts uses a positioning groove for initial positioning, the floating main pressure plate for vertical clamping, and the lateral clamping mechanism for horizontal clamping. Through mechanical linkage, it achieves bidirectional synchronous clamping of the L-shaped contour of the metal part, effectively solving the problem of torsion and displacement that easily occurs during cutting due to the asymmetry and low rigidity of the metal part, thus ensuring the perpendicularity and flatness of the cut end face from the root.

The application relates to a material tower taper detection technical field, in particular to a material tower core mold taper part radius real-time determination structure and a winding forming system and method, a wire wheel is arranged on a pull rod, the top end of the pull rod is fixedly connected with an outer rod, the inner side of the outer rod is slidably connected with an inner rod, the inner rod can abut against the surface of the taper part upwards, the bottom end of the inner rod is a piston, a second spring is fixedly connected between the piston and the inner side of the outer rod, a potentiometer is fixedly connected on one side of the inner rod, a fixed block is fixedly connected on the inner side of the top end of the outer rod, the fixed block slides on the potentiometer, the real-time radius of the winding position of the taper part is obtained by obtaining the position of the fixed block on the potentiometer, the pull rod moves rightwards under the driving of a lead screw, the wire wheel moves rightwards synchronously, winding movement is realized, the outer rod bends to one side, so that the middle surface of the inner rod and the wire wheel is in the same plane, and the real-time radius of the winding position of the taper part is obtained by obtaining the position of the fixed block on the potentiometer.