144results about How to "Reduce hydraulic shock" patented technology

The invention discloses a method and a device for improving the operation comfort of an excavator. The device is characterized in that a one-way throttle valve is additionally arranged at one end or both ends of a pilot oil line of a revolving control valve core and a movable arm control valve core; when pilot oil flows to a main control valve core from a corresponding pilot valve, the single throttle valve on the branch is in an opened state; when the pilot oil flows to the corresponding pilot valve from the main control valve core, the one-way throttle valve on the branch is in a closed state, and the pilot oil returns through throttle holes of the one-way throttle valve. By arranging the one-way throttle valve on the pilot oil of the revolving control valve core and the movable arm control valve core, the oil returning speed is limited, and the hydraulic impact is reduced, thus the operation comfort is enhanced.

The invention discloses a braking kinetic energy regenerating hydraulic retarder for an automobile. The hydraulic retarder is an oil pump and hydraulic system arranged on power takeoff windows for gearboxes of large and medium automobiles. The hydraulic retarder not only has functions of the hydraulic retarder for the automobile, but also can recycle kinetic energy to be abandoned when the automobile brakes. The hydraulic retarder is characterized in that: the hydraulic retarder is connected in parallel with main transmission of the automobile, so the hydraulic retarder is convenient to joint and separate; remarkable energy-saving effect is achieved; energy is released and more force is applied when a vehicle is started, so the working condition of an engine is improved and the emission of harmful gas is reduced; starting speed can be increased and running efficiency is improved; mechanical rigid braking is replaced by flexible hydraulic retarding, so riding comfort is improved, the service lives of vehicle braking and a braking system are prolonged, and the safety performance of the vehicle is enhanced; and conventional mature hydraulic technology and hydraulic components produced in a large scale are adopted, so the system is simple and reliable, has low manufacturing cost, and is easy to popularize and apply.

The invention discloses a two-way cartridge type vibration control valve which comprises a valve body, a direction control branch loop, a vibration stop branch loop and a safe branch loop. The direction control branch loop is inserted in the valve body and formed by four two-way cartridge valves and the like. The hydraulic impact of a road roller in the vibration starting process is reduced, the peak pressure of a hydraulic system is lowered, the work reliability and durability of a hydraulic element are improved, the vibration stop time is shortened, and the operation quality of the road roller and the comfort feeling of a driver are improved. Compared with the prior art, a two-way cartridge valve and a control cover plate component of the two-way cartridge valve are omitted, the size is reduced, and the hydraulic system is simpler, more convenient to maintain and lower in production cost. Meanwhile, in the two-way cartridge type vibration control valve, an adjusting flow valve is arranged between the branch oil path position, communicated with the first two-way cartridge valve and the fourth two-way cartridge valve, of an oil inlet connector and an oil return connector, and the vibration frequency of the road roller can be adjusted when needed.

The invention discloses a stamping stretching full-automatic production device and a control method thereof, and aims to provide the stamping stretching full-automatic production device which is highin stability, simple in structure and high in practicability. The stamping stretching full-automatic production device is characterized in that a first buffer oil path comprises a first buffer valve and a first on-off valve, a valve cavity of the first buffer valve is internally provided with an inner valve core, the inner valve core includes a mesa portion and a planar portion, the mesa portion is located in an oil return cavity, the planar portion is located in a re-pressing cavity, a mesa area of the mesa portion is less than the planar portion, the inner valve core is provided with a plurality of through holes communicating with the oil return cavity and the re-pressing cavity, a reset spring is arranged in the re-pressing cavity, and when a workpiece reaches a predetermined stretchingvalue, the first buffer valve is gradually closed by gradually closing the first on-off valve, and when the pressure of the valve core in the first buffer valve is gradually reduced from the pressureof a hydraulic pump until the first on-off valve is closed, the first buffer valve carries out the acting force of the reset spring, so that the plugging effect on the first buffer valve is formed; and the stamping stretching full-automatic production device is suitable for the technical field of machining equipment.

The invention provides a free-slewing cushion and brake hydraulic system and method used in a crawler crane. The hydraulic system comprises a main rotary pump, an oil supplementing pump, an overflow valve, a brake valve, a brake, a rotary motor, a free-swing control valve and an inverse-proportional electromagnetic pressure reducing valve, wherein, the inverse-proportional electromagnetic pressure reducing valve is connected between the brake valve and the brake; the main rotary pump and the rotary motor are connected together to form a circuit; and the free-swing control valve is connected between the main rotary pump and the rotary motor. The free-slewing cushion and brake hydraulic system and method used in the crawler crane have the advantages of fast response speed and stable and reliable service performances; and by utilizing the system and method, stable and good brake effect can be provided, hydraulic impact and discomfort of a driver caused by brake are reduced maximally, and inertial impact on the active crawler crane from the passive crawler crane resulting from brake can be effectively prevented so as not to cause damage to the active crawler crane.

The invention provides an intelligent buffering and overflowing device. A hydraulic oil tank (1) is communicated with a reversing valve (2) through a hydraulic pump; a first working oil opening A of a control valve is communicated with one end of a rotary motor (3) through a first executing oil opening C1; a fifth check valve (4.4), a third check valve (4.2), a first direct-acting type overflowing valve (5) and a first check valve (4) are connected between the first working oil opening A of the control valve and a pipeline of the rotary motor in parallel; the check valves and the direct-acting type overflowing valve are connected between a second working oil opening B of the control valve and the pipeline of the rotary motor by a second executing oil opening C2; an electric proportion flow control valve (6) is connected among the four check valves in parallel; a main oil pipeline which is connected between the check valves and the direct-acting type overflowing valve in parallel is in pipeline communication with the hydraulic oil tank through an oil supplementing opening T. The hydraulic impact when a rotary drilling rig does rotary movement is reduced and the getting-on shaking amount when the rotary drilling rig rotates is reduced; the stability of a main engine is improved and the service life of related components is prolonged.

A loader four-pump quantitative confluence hydraulic system comprises an auxiliary pump system. The auxiliary pump system comprises a fist flow switching valve and a second flow switching valve which are used for switching the pressure oil of an auxiliary pump from supplying oil to a steering system or an operating system. The oil outlet of a brake pump is connected to a third flow switching valve used for switching the pressure oil of the brake pump from supplying oil to a full hydraulic brake unit or supplying control oil pressure used for controlling reversing switching to the first flow switching valve. The steering system is provided with a shuttle valve; two inlets of the shuttle valve are connected to two oil outlets of a steering gear and are connected to the second flow switching valve and the third flow switching valve so as to pushing the second flow switching valve and the third flow switching valve to switch during steering. The loader four-pump quantitative confluence hydraulic system has the advantages the multiple pump confluence technology is adopted, displacement of the steering pump and operating pump is reduced, and energy saving is realized; by means of a direct pump unloading manner, hydraulic impact is reduced at the end of the cylinder stroke, and meanwhile, high-pressure large-amount overflow can be avoided.

The invention relates to a hydraulic buffer. The hydraulic buffer comprises a hydraulic cylinder, a piston and a cylinder cover fixedly connected to the hydraulic cylinder, the piston is fixedly connected to a piston rod, wherein the cylinder cover comprises a cylindrical cavity and a throttle orifice, the throttle orifice is communicated with the cavity, the piston is fixedly connected to a buffer ring; the buffer ring is fixedly connected to a blocking ring; the blocking ring is in sliding connection with the piston rod; the end part of the piston rod is fixedly connected to a baffle; the diameter of an outer ring of the baffle is smaller than the inside diameter of the hydraulic cavity. Compared with the traditional throttle buffer of a hydraulic cylinder, the hydraulic buffer provided by the invention adopts a compression structure of the buffer ring and the throttling and buffer actions of the throttle orifice, and has the advantages of good buffer effect, small hydraulic impact and stable running.

The invention particularly relates to a variable speed double-piston series-connection hydraulic cylinder. According to the technical scheme, the end of a large piston rod (25) extends out of a guide sleeve (4) and a large end cap (2), the other side of a large piston (6) is concentrically provided with a small piston hole, the aperture of the small piston hole is equal to the outer diameter of a small piston (11), the depth of the small piston hole is equal to the thickness of the small piston (11), the large piston (6) and the large piston rod (25) are concentrically provided with small piston rod through holes, and a small piston rod (26) penetrates through the small piston rod through holes. The side face of the large piston (6) on the same side with the small piston holes is provided with a valve base hole, the hole wall of the valve base hole is sequentially provided with a first annular oil groove (28) and a second annular oil groove (35) from inside to outside, the first annular oil groove (28) is communicated with a rod cavity (23) of the large piston rod through a first oil channel (20), the second annular oil groove (35) is communicated with the small piston hole of the large piston (6) through a second oil channel (18), and a quick stop valve (19) is fixed to the inside of the valve base hole. The variable speed double-piston series hydraulic cylinder has the advantages of being simple in switch, saving energy, lowering cost, and being convenient to maintain and stable in switch process.

The invention provides a dam body device for treatment of an urban artificial watercourse. The dam body device comprises a first dam body, a first plugging device, an aquatic plant planting zone and a blocking device, wherein the first dam body extends in the width direction of the urban artificial watercourse; the lower part of the first dam body is provided with a first drainage channel; the side surface, facing the downstream part of the urban artificial watercourse, of the first dam body is a slope surface; a plurality of first salient points are arranged on the slope surface; the first plugging device is arranged to conduct or cut off the first drainage channel; the aquatic plant planting zone is arranged at the downstream part of the first dam body; the aquatic plant planting zone is arranged for planting aquatic plants; the blocking device is arranged at the downstream part of the aquatic plant planting zone, and is provided with at least one blocking unit; and the blocking units are provided with first fish screens, activated carbon fiber filter cloth, chitosan fiber filter cloth and second fish screens which are sequentially arranged in the water flowing direction. The dam body device is simple in structure, can isolate algae floating objects like blue-green algae in a water body, can block and remove parts of organic substances and heavy metals, and has an excellent treatment effect.

The invention discloses a hydraulic rotation control system of a dynamic compaction machine. The system comprises a two-way quantitative hydraulic motor, a shuttle valve, a balance valve and a cushionvalve. Two oil inlets of the two-way quantitative hydraulic motor are each connected with one oil supply line. The shuttle valve, the balance valve and the cushion valve are arranged between the twooil supply lines in a connected manner. The shuttle valve is used to supply oil to the cushion valve. An oil inlet and an oil outlet of the cushion valve are located on the two oil supply lines respectively, and are located between the balance valve and the two-way quantitative hydraulic motor. After rotation operation stops, the balance valve plays a role in hydraulic braking; after rotation stops suddenly, because of the inertia of the motor, the pressure of an oil return chamber rises, and when the pressure rises to a set pressure, because the cushion valve loses balance at the moment, a higher chamber and a lower chamber communicate with each other, a peak pressure will disappear, and shaking impact of a complete machine will not happen; and additionally, compared with a traditional overload valve or an overload time delay valve system, the cushion valve directly adopts rotation pressure control, and thereby being capable of meeting the requirement for control in time, and then theresponse speed is high.

The invention discloses a compound electro-hydraulic downhole control system of a deepwater test tubular column safety device. The compound electro-hydraulic downhole control system comprises a groundplatform, an umbilical cable, an underwater energy accumulator group, a downhole control module and a hydraulic actuator. Through sensor devices installed on the interface circuit and control circuitof the hydraulic actuator, environmental parameter data such as the pressure are collected, the ground platform analyzes and compares the collected data with a database, and then sends out control command, the control command is transmitted to the downhole control module through the umbilical cable, and the hydraulic actuator is controlled. According to the compound electro-hydraulic downhole control system, two modes of electro-hydraulic control and pilot valve pressure control are achieved, the reliability of the deepwater test tubular column safety device is effectively improved, the characteristics of fast response, real-time monitoring, high flexibility and the like are achieved, and the deepwater test safety operation can be better ensured.

The invention provides a hydraulic-driven reciprocating water pump used in a fresh water cooling and dust removal system. The water pump comprises a water pump shell and a reversing valve, wherein thereversing valve is provided with an oil inlet, an oil return port and two working ports, a water inlet and a water outlet are formed in the water pump shell, a reversing mechanism for switching the valve core station is arranged on the reversing valve, and the inner cavity of the water pump shell is divided into an oil cavity and two water cavities which are arranged on the left side and the right side of the oil cavity respectively; an oil piston is arranged in the oil cavity, and water pistons rigidly connected with the oil piston is arranged in the two water cavities respectively; the twoworking ports communicate with the parts, at the two sides of the oil piston, of the oil cavity respectively; and the two water cavities are provided with first one-way valves communicating with the water outlet correspondingly, and the two water cavities are provided with second one-way valves communicating with the water inlet correspondingly. According to the work of the oil pressure-driven reciprocating type water pump, the hydraulic impact of pumped water flow is small, the water flow is stable, meanwhile, the water pump can be automatically reversed, control is simple, the manufacturingand maintenance cost is low, and the operation is simple and reliable.