32results about How to "Reduce lateral friction" patented technology

The invention belongs to the technical field of a rammer for foundation treatment in construction engineering, and specifically relates to a special rammer for dynamic compaction replacement treatment of flow-plastic to soft-plastic clay, including a hook part, an anti-buried hammer extension part and a rammer For the hammer body, the height of the anti-buried hammer extension is more than 2.8 meters. The rammer body includes an upper trapezoidal circular table structure and a lower cylindrical structure. The outer wall of the rammer body is evenly distributed with a number of semicircular ventilation holes. The present invention solves the problem of "buried hammer" in the dynamic compaction replacement of flow-plastic to soft-plastic clay foundations. For the problem that it is impossible to carry out dynamic compaction depth replacement due to hammering, dynamic compaction, an environmentally friendly and low-cost treatment technology, can further expand the scope of application, and has a broad application market and good development prospects.

The invention discloses a large wind tunnel test section replacement method. The purpose is to solve the problem that according to an existing wind tunnel test section transportation mode, travellingmechanisms turn inconveniently or positioning is not accurate during replacement. According to the large wind tunnel test section replacement method, test section transportation vehicles are adopted for conducting test section transportation and replacement, a test section is not provided with travelling mechanisms, and through lifting, 90-degree turning of wheels and freely parallel operation ofthe multiple vehicles of the test section transportation vehicles, turning of the wind tunnel test section is achieved; meanwhile, a V-flat slideway mode is adopted for positioning wind tunnel test stations of the test section, round liquid hydrostatic bearings are arranged on the test section transportation vehicles and are used for reducing transverse friction force when the test section falls into a slideway, and through cooperation of the V-flat slideway, the wind tunnel test section and the round liquid hydrostatic bearings, the wind tunnel test section is precisely positioned. By means of the large wind tunnel test section replacement method, the problems that during wind tunnel test section transportation and replacement, positioning is not accurate, and the travelling mechanisms need to turn can be effectively solved, so that the large wind tunnel test section replacement method has a high application value.

The invention relates to an intelligent vibration reduction coordination system applied to high-speed trains and a control method thereof, belonging to the technical field of rail train control, comprising a vibration reduction unit, the vibration reduction unit being respectively arranged in each carriage, and characterized in that it further comprises: an induction unit and a cooperative controller, the induction unit includes an inclination sensor and a speed sensor, the induction unit is used to detect the train inclination and the speed of the train, the output end of the induction unit is connected to the signal input end of the cooperative controller, A delay module is arranged between each car, and the delay module is used to adjust the damping coefficient output by the vibration reduction unit of each car according to the time difference when each car of the train passes the same point. According to the actual situation, actively adjust the state of the wheel to adapt to the rail, reduce the force between the rail and the wheel when the motion state changes, improve the service life of the wheel and the rail, and improve the comfort and operational safety and stability of the train.

The invention relates to an engine, in particular to a four-cylinder horizontal opposed variable compression engine. The compression ratio can be changed. The engine comprises an upper frame, a lowerframe, a gradient gear and a crankshaft, a variable compression ratio control system comprises a servo motor, an adjusting rod connecting piece I, a left control arm, a right control arm and a third piston, so that the effective compression stroke of a piston I in a piston cylinder II changes, the ratio of the effective compression stroke of the piston I in the piston cylinder II to the effectivestroke of the piston I in the piston cylinder II is changed (the effective compression ratio), so that the effective compression ratio of the engine is adjusted; the piston connecting rod I and a piston connecting rod II or a piston connecting rod III and a piston connecting rod IV are horizontally opposite, so that the gravity center of the engine is lowered, and the overall balance is easier toachieve; and a limiting boss is fixedly connected to the inner end of a lower frame body, so that damage to a motor due to overload caused by excessive deflection when a servo motor controls the maximum peak value and the minimum peak value during compression ratio changing can be prevented.

A seat angle adjustment device includes a ratchet wheel, a stop plate, a locking slipper and a pawl, wherein a first stop position limiting part and a second stop position limiting part are arranged on the stop plate, when the first stop position limiting part is subjected to a rotating torque in a rotational direction, the locking slipper in a locking position circumferentially abuts against the first stop position limiting part; when the rotating torque is higher than a first preset torque value, the pawl in an extended state is driven by the ratchet wheel to rotate until the tooth part on one side of the pawl is completely engaged with the ratchet wheel; and when the rotating torque is higher than a second preset torque value, the second stop position limiting part abuts against the pawl. A seat having the seat angle adjustment device is also provided.

The utility model relates to a two-guided and lubricated automobile shock absorber capable of reducing wear and enhancing vibration damping effect. The technical solution is: including an oil storage cylinder, a working oil cylinder is arranged inside the oil storage cylinder, the bottom of the oil storage cylinder and the bottom of the working oil cylinder are connected through a bottom valve, a piston device is arranged in the working oil cylinder, and a first guide is set on the upper part of the working oil cylinder. There is a second guide sleeve on the top of the first guide sleeve, the upper and lower end faces of the two guide sleeves are connected, the two guide sleeves are sleeved on the piston rod through the guide bearing, and an oil seal is arranged on the top of the second guide sleeve. The feature is that conduits are respectively arranged on the connecting rod shafts at both ends of the piston, and shut-off spring brackets are arranged on the two end faces of the conduits connected to the piston, and shut-off springs are arranged oppositely on the shut-off spring brackets, and on the top of the first guide sleeve An oil storage tank is provided, an oil return hole of the first guide sleeve is provided on the first guide sleeve through the upper and lower surfaces of the first guide sleeve, a ring groove is provided on the top of the second guide sleeve, and a second guide sleeve is provided on the inner wall of the ring groove. The oil return hole of the guide sleeve, the oil return hole of the first guide sleeve communicates with the oil return hole of the second guide sleeve, and the lower end of the oil return hole of the first guide sleeve communicates with the oil storage cylinder.

The invention relates to the field of washing equipment and aims at providing a low-pressure maintaining high-pressure washing device. The low-pressure maintaining high-pressure washing device comprises a high-pressure pump which is provided with a motor. The low-pressure maintaining high-pressure washing device further comprises a low-pressure maintaining device. The low-pressure maintaining device comprises a valve body, a low-pressure maintaining valve and a control switch, wherein the valve body is provided with a pressure relief outlet, a high-pressure outlet and a high-pressure inlet communicating with an outlet hole of the high-pressure pump, the rear end of the low-pressure maintaining valve extends out of a valve rod at the rear end of the valve body, and the control switch is provided with a drive rod which is opposite to the rear end of the valve rod and is electrically connected with the motor. According to the low-pressure maintaining high-pressure washing device, when a high-pressure washing machine pauses, the high-pressure pump can achieve pressure maintaining with relatively low pressure, and no damage is caused.