55results about How to "Improve fretting performance" patented technology

A hydraulic control system and a hydraulic control method are disclosed. The hydraulic control system comprises a first closed pump (P1) and a first engine (M1) connected with each other, a second closed pump (P2) and a second engine (M2) connected with each other, and a hydraulic motor (P3). The first closed pump (P1), the second closed pump (P2) and the hydraulic motor (P3) are connected in parallel. Compared with the prior art, the present hydraulic control system has advantages of wider engine model selection range, higher reliability and better micro-motion performance.

The invention discloses a hydraulic system and an engineering machine. The hydraulic system comprises a hydraulic pump, a main control valve, a pressure-difference adjusting valve and a controller. The pressure-difference adjusting valve is arranged between an oil discharging port of the hydraulic pump and a load feedback oil port of the main control valve and used for adjusting the differential pressure between the oil discharging port and the load feedback oil port; the input end of the controller is connected with an accelerator and used for receiving signals of the accelerator; the first output end is connected with the pressure-difference adjusting valve and used for controlling the pressure-difference adjusting amount of the pressure-difference adjusting valve according to the signals of the accelerator. According to the hydraulic system, the flow of a valve rod of the main control valve can be controlled according to the signals of the accelerator, so that an engine is either at an idle speed or at a high speed, and the adjustment on the flow within the whole stroke of the valve rod of the main control valve can be achieved, namely the flow adjusting gain of the main control valve is small at the idle speed, and the jogging performance is good; the flow adjusting gain of the main control valve is large at the high speed, and the requirements for large flow and high speed are met.

The invention discloses a rotary control valve unit, a rotary control hydraulic system and a crane. The rotary control valve unit comprises a proportional reversing valve, a shuttle valve and a fixed-difference overflow valve, wherein two oil inlets of the shuttle valve are respectively communicated with two working oil ports of the proportional reversing valve, oil outlets of the shuttle valve are communicated with a second pressure sensing port of the fixed-difference overflow valve, a first pressure sensing port of the fixed-difference overflow valve is communicated with oil inlets of the proportional reversing valve, and overflow oil ports are communicated with an oil return path. Under the loading state, the two pressure sensing ports of the fixed-difference overflow valve sense the pressure of the oil inlets and the high-pressure working oil ports of the proportional reversing valve, when the difference of the two pressures is larger than a preset value, the overflow pressure of the fixed-difference overflow valve is correspondingly adjusted, part hydraulic oil of a high-pressure oil source enters the oil return path for decompression through the overflow oil ports of the fixed-difference overflow valve so as to stabilize the difference of oil pressure of the oil inlets and load pressure of the proportional reversing valve, accordingly the influence on flow of the high-pressure working oil ports caused by load pressure changing is reduced, and load flow stability is improved.

The invention discloses a boom variable-amplitude hydraulic system. The system comprises a main pump, a main valve, a variable-amplitude oil cylinder, a first oil way and a second oil way. The first oil way is connected with a first cavity oil port of the variable-amplitude oil cylinder. The second oil way is connected with a second cavity oil port of the variable-amplitude oil cylinder. The first oil way is connected with a first work oil port of the main valve. The second oil way is connected with a second work oil port of the main valve. The main pump is connected with an oil inlet of the main valve, and a pressure control valve is arranged in the first oil way. The hydraulic system further comprises a servo pump and a servo oil way. The servo pump supplies oil to the servo oil way which is connected with a pilot oil port of the pressure control valve. A hydraulic valve is arranged in the servo oil way and controls the opening degree of the pressure control valve. The hydraulic system solves the problem that a balance valve in the prior art is frequently opened and closed and accordingly a beam waggles, and improves boom variable-amplitude operating stability and micro movement performance.

The invention discloses a storage type folding arm rest of an aerial work platform. The storage type folding arm rest comprises a derricking cylinder and a rotating table and is characterized by further comprising a first arm mechanism, a second arm mechanism, a front rotating table support and a rear rotating table support; the front rotating table support and the rear rotating table support are arranged on the rotating table, and the front rotating table support is used for supporting the first arm mechanism; the rear rotating table support is used for supporting the second arm mechanism, and the second arm mechanism is contained in the first arm mechanism under the stationary state; the derricking cylinder is vertically and perpendicularly arranged on the front portion of a folding arm rest; and the derricking cylinder is connected with the first arm mechanism, and the derricking cylinder is further connected with the second arm mechanism. The derricking cylinder can drive the first arm mechanism and the second arm mechanism to move. The storage type folding arm rest of the aerial work platform is simple in structure, low in gravity center, small in using number of oil cylinders, low in cost and convenient to control, and saves space.

The invention discloses a crane luffing control valve, comprising a valve body and a valve core. The valve body is provided with an oil inlet, a first oil outlet, a second oil outlet and an oil return opening. One end of the valve core seals the second oil outlet shoulder and is equipped with a first groove for connecting the oil inlet and the second oil outlet; the other end of the valve core is equipped with a second groove for connecting the second oil outlet and the oil return opening; at least one of the second groove and the first groove has an axial spacing less than a width of an under cut groove of the second oil outlet. The control valve can substantially enhance jiggle characteristic of the crane during luffing and eliminate jitter phenomenon of a handle in a micro opening. The invention also discloses a crane luffing hydraulic system equipped with the crane luffing control valve.

The invention discloses a method, device and system for processing handle signals. The method includes the steps of receiving the actual torque of an engine and a handle angle analog quantity input value of a control handle, determining a step size set value preset by a controller according to the received actual torque, detecting change values of the handle angle analog quantity input value in each control period, and determining a handle analog output quantity by comparing the change values of the handle angle analog quantity input value and the step size set value. By means of the technical scheme, the problems that after the controller is buffered and processed in correlative techniques, due to the fact that a buffer processing result is fixed, the requirement for more precise operation control can not be met, and the problem that system stability is poor can be solved.

The invention discloses a multi-way valve hydraulic system which comprises a multi-way valve set connected with a performing mechanism, first and second oil pumps connected with the oil supply line of the valve set, and a flow distributing and converging device, wherein the flow distributing and converging device is arranged between the second oil pump and the oil supply line; when the difference between the oil supply pressure of the oil supply line and the load pressure of the hydraulic system is greater than a preset value, the flow distributing and converging device is in a first state, so that hydraulic oil output by the second oil pump flows back to an oil tank through the flow distributing and converging device; when the difference between the oil supply pressure of the oil supply line and the load pressure of the hydraulic system is smaller than the preset value, the flow distributing and converging device is in a second state, so that the hydraulic oil output by the second oil pump enters the oil supply line to be converged with hydraulic oil in the first oil pump. The hydraulic system is capable of outputting the hydraulic oil with the corresponding flow quantity according to the flow quantity required by the performing mechanism, so that the energy waste is avoided and the smoothness and the micro-motion property of the system are improved. The invention further discloses a crane to which the multi-way valve hydraulic system is applied.

The invention discloses a rotary system and a crane, relates to the field of engineering machinery and is used for optimizing the performance of an existing crane rotary control system. The rotary system comprises a working oil pump, a micro oil pump, a rotary reversing valve and a changeover valve; the working oil pump is used for providing working pressure oil for the rotary reversing valve, and the working pressure oil flows to a rotary motor so as to realize the working steering of the rotary motor; the micro oil pump is used for providing micro pressure oil for the rotary reversing valve, the micro pressure oil flows to the rotary motor so as to realize the micromotion of the rotary motor; when the changeover valve is in an electric state, only the micro pressure oil provided by the micro oil pump can flow to the rotary motor; when the changeover valve is in a power-loss state, only the working pressure oil provided by the working oil pump can flow to the rotary motor through the rotary reversing valve. According to the technical scheme, the micro control of the rotary motor can be realized.

The invention discloses an electro-hydraulic compound control hydraulic system of a loader. The electro-hydraulic compound control hydraulic system comprises a hydraulic tank, an engine, a variable pump, an electric control reversing valve block, a first shuttle valve, a second shuttle valve, a third shuttle valve, a distribution valve, a pilot valve, a pilot oil source block, an electric control handle and a controller. The invention further provides a control method which uses the electro-hydraulic compound control hydraulic system of the loader. According to the electro-hydraulic compound control hydraulic system of the loader and the control method, staged compound control is performed according to actual working conditions of the loader, so as to guarantee good inching performance and manoeuverability when the loader slowly moves; when the loader quickly moves, energy losses can be further reduced, the loader can automatically adapt to actual load, and load impact on the pump is reduced; under high pressure and large load, the output of the hydraulic system is automatically adjusted, so as to reduce load impact on the engine and guarantee stable and reliable operation of the engine.

A valve element of a hydraulic multi-way valve comprises a valve element body, and the valve element body is provided with a first throttling groove set, a second throttling groove set, a third throttling groove set, a fourth throttling groove set and a fifth throttling groove set. The throttling groove sets of different shapes and different opening lengths are formed in the valve element body so that the flow of the valve element can be directly proportional to the whole process of valve element displacement; the impact phenomenon generated in the opening and closing process of the valve element can be effectively avoided, motion stationarity can be effectively achieved, and therefore microoperation performance and precise location of lifting or descending of a working device of a loader are improved.

The invention discloses a hydraulic control system and a hydraulic control method to solve the problems that an engine of the hydraulic control system has high model selection limitation, or the system has complicated pipelines, high heat productivity, many fault sources, not ideal micromotion performance of motions and the like in the prior art. The hydraulic control system comprises a first closed pump and a first engine connected with each other, a second closed pump and a second engine connected with each other, and a hydraulic motor, wherein the first closed pump, a second closed pump and the hydraulic motor are connected in parallel. Through the technical scheme, the hydraulic control system has the advantages of wider engine model selection range, higher reliability and better micromotion performance.

The invention discloses a machine tool descending stability control method and system and a tractor, and belongs to the technical field of tractors. An outlet of a main pump is respectively connected with inlets of a main overflow valve, a fixed-difference overflow valve and a machine tool control valve; an oil outlet of the machine tool control valve is connected with a spring cavity of the fixed-difference overflow valve through a steady-state throttle valve, and meanwhile, the oil outlet of the machine tool control valve is connected with an inlet of a switch valve; an oil outlet of the switch valve is connected with a rodless cavity of a suspension oil cylinder in a suspension mechanism; the rodless cavity of the suspension oil cylinder is simultaneously connected with an inlet of a lowering valve; a rod cavity of the suspension oil cylinder is connected with an inlet of a secondary overflow valve; a position sensor, a force sensor, a descending knob, a target position setting knob and a descending speed setting knob are electrically connected with the input end of a controller; and the output end of the controller is electrically connected with an electromagnetic valve of the machine tool control valve, an electromagnetic valve of the lowering valve and an electromagnetic valve of the switching valve. The machine tool descending stability control method and system and the tractor have the characteristics of being good in micro-motion performance, stable in starting, controllable in descending speed, stable in descending process and the like.

The invention discloses an engineering truck support leg electrohydraulic control system, method, a detection method and an engineering truck. An oil outlet of a pilot valve module is connected with an oil inlet of a support leg operation handle; an oil outlet of a support leg electronic control valve set is connected with a work oil outlet of a reversing valve; the work oil outlet of the reversing valve is respectively connected with a rodless cavity and a rodlike cavity of a left support leg retracting oil cylinder; the work oil outlet of the reversing valve is respectively connected with a rodless cavity and a rodlike cavity of a right support leg retracting oil cylinder; and a control device is electrically connected with the support leg electronic control valve set and the pilot valve module individually. Great micro-motion and maneuverability can be achieved when the engineering truck slowly moves by the use of the electrohydraulic control system, the method, the detection method and the engineering truck; high signal collection precision is achieved; accurate judgments can be conducted to practical work conditions of the engineering truck; the engineering truck has strong controllability; mis-operation by operators can be avoided, so whole truck safety can be improved; service life of a balance valve is prolonged; detection time can be reduced; and occurrence rate of high risk accidents can be lowered.

The invention discloses a load sensitive hydraulic control system, comprising a multipath directional control valve and a load sensitive pump having a load sensitive valve, wherein, a liquid inlet and an oil drain port of the multipath directional control valve are respectively communicated with a liquid outlet and an oil tank of the load sensitive pump, a load feedback port of the multipath directional control valve is communicated with a sensitive cavity of the load sensitive valve, and each uniting valve oil port of the multipath directional control valve is respectively connected with the corresponding executive component; the passage between the load feedback port of the multipath directional control valve and the sensitive cavity of the load sensitive valve is provided with a damper valve; the oil duct between an oil inlet and an oil outlet of the damper valve is provided with at least two dampings, and the oil duct between the adjacent two dampings is provided with a chamber having an enlarged cross section; and the oil outlet is communicated with the load feedback port of the multipath directional control valve, and the oil inlet is communicated with the sensitive cavity of the load sensitive valve. In addition, the invention provides a crane having the load sensitive hydraulic control system.

The invention relates to a balance valve and an engineering machine. The balance valve comprises a loading cavity, an oil inlet cavity and a balance valve body core, wherein a first oil duct for communicating the loading cavity with the oil inlet cavity is arranged in the balance valve; the balance valve body core is provided with a second oil duct for communicating the loading cavity with the oil inlet cavity; when the balance valve is reversely opened, the initial section of the motion stroke of the balance valve body core is a cover stroke; and in the cover stroke, the first oil duct is closed, so that oil flows back through the second oil duct, wherein the through flow of the second oil duct is smaller than that of the first oil duct. In the cover stroke, the first oil duct is closed, the oil flows back through the second oil duct, and the through flow of the second oil duct is smaller than that of the first oil duct, thereby preventing instantaneous change of the pressure in the balance valve loading cavity and enhancing the jogging property of the system. The balance valve can avoid frequent opening and closing and prevent the hoisting system from being subjected to action impact, whipping or other phenomena, thereby enhancing the stability of the balance valve and system.

The invention discloses a hydrodynamic compensation balance valve. A pilot control end cover assembly comprises a control end cover valve body, and a pilot oil channel is arranged on the control end cover valve body; a valve element assembly comprises a throttling valve element, a main spring and an adjusting valve seat; a one-way valve seat assembly comprises a one-way valve and a one-way valve spring; a balance valve body assembly comprises a balance valve body and a valve seat; the throttling valve element is provided with a throttling opening with the angle of alpha; the right end inner wall conical surface of the one-way valve is mutually matched with a throttling opening conical surface of the throttling valve element to form opening and closing sealing; and the one-way valve moves to the left when the amplitude of variation rises, the one-way valve function of the balance valve to an oil opening B from an oil opening A is realized, the throttling valve element is started to theright under the action of pilot control pressure when the amplitude of variation declines, the balance valve function from the oil opening B to the oil opening A is realized, with the increasing of loading pressure, the opening size of the throttling opening of the throttling valve element is controlled by hydrodynamics generated by an annular overcurrent channel with the angle of the throttling valve element of alpha, and load-flow compensation is realized.

The invention discloses a cocurrent flow control system, a cocurrent flow control method and a crane and relates to the field of engineering machinery. By virtue of utilizing control logic based on an electromagnetic valve, a pilot operated directional control valve and a shuttle valve, automatic control and manual control for the coccurent flow of two dumps can be realized, and the operation rapidness and operation reliability of the crane are improved; during composite action, when the load pressure difference is increased to a certain extent, a dual-pump cocurrent flow state is automatically switched to a dual-pump independent oil supply non-coccurent flow state, performances are not mutually influenced and the composite action effect is improved; by the using of a dual-pump coccurent flow manual control mechanism, independent operations of the two pumps can be realized according to demands of actual working conditions, for instance, single-pump operation is realized when operations such as hoisting jiggle, amplitude variation decrease, and arm stretching and contraction are performed, so that the jiggle property is improved and the energy consumption is reduced.

The telescopic control system comprises a telescopic control valve, a balance valve group, a telescopic oil cylinder and an electromagnetic directional valve, a port A of the telescopic control valve is communicated with a rodless cavity of the telescopic oil cylinder through the balance valve group, and a port B of the telescopic control valve is communicated with a rod cavity of the telescopic oil cylinder; the balance valve group comprises at least two groups of balance valves, a port X1 and a port X2 of the balance valve group are respectively connected with one group of balance valves, and a control port X1 of the balance valve group is connected with a communication oil path between a port B of the telescopic control valve and a rod cavity of the telescopic oil cylinder; a valve port of the electromagnetic reversing valve is communicated with an X2 of the balance valve group and a communication oil path between a port B of the telescopic control valve and a rod cavity of the telescopic oil cylinder; and a port C of the electromagnetic reversing valve is communicated with a control port X2 of the balance valve group. And an adjustable pressure reducing valve is also arranged between the control port X1 and the oil path at the rod cavity end of the telescopic oil cylinder. The problems that in the prior art, the retraction speed is uncontrollable, noise is large due to the fact that a suspension arm is reversely buckled during retraction, and the whole vehicle vibrates are solved.

The invention discloses an arm support motion control method including the following steps: two input components of arm support control signals are obtained; the judgment result whether the arm support is linked is obtained in the condition that both of the amplitudes of the two input components are greater than a preset control threshold value; if the arm support is linked, the two input components are respectively compared with corresponding preset benchmark values so as to determine a current linkage area; according to the difficulty value of a preset arm support motion direction, the input component corresponding to the direction in which the difficulty value of the current linkage area is smaller is selected to be a first target signal, and the other input component is selected to bea second target signal; a first and a second proportionality coefficients corresponding to the first and the second target signals are obtained, wherein, the first proportionality coefficient is smaller than 1 and the second proportionality coefficient is greater than or equal to 1; according to the first and the second proportionality coefficients, the first and the second target signals are respectively varied to generate two output components; and according to the two output components, telescopic and pitching driving signals of the arm support are respectively outputted. The invention cancoordinate the linkage of the arm support and correspondingly further discloses an arm support motion controller and a control system.

The invention relates to hydraulic oil cylinders, in particular to an ultra-high pressure sealed structure oil cylinder. The sealing problems of an ultra-high pressure oil cylinder or an oil cylinderwith large pressure fluctuations are solved. The ultra-high pressure sealed structure oil cylinder is composed of a cylinder body assembly and a piston rod assembly. The piston rod assembly is composed of a piston rod and a piston. The piston divides the internal space of the oil cylinder into a rod cavity and a rodless cavity. Valve core holes distributed symmetrically are formed in the outer round end surface of the rodless cavity side of the piston, wherein the valve core holes penetrates through the rod cavity. A left cone valve core and a right cone valve core are installed in the valve core holes, and the cone valve surfaces are compressed by springs. A through hole penetrating through the axis is formed in the bottom of a piston combined seal groove, the through hole is connected tothe two symmetrically distributed e valve core holes. A working principle is: when high pressure oil enters the rodless (rod) cavity of the oil cylinder, pressure oil opens the cone valve cores and acts on the bottom of the combined seal through the valve core holes and the through hole, the combined seal is compressed, and the compression amount of the combined seal is automatically adjusted according to the size of the oil pressure, so that the defects such as short life and large heat generation caused by high pre-compression of the high-pressure oil cylinder combined seal are overcome, and meanwhile, the fretting performance of the oil cylinder can be improved.

The invention discloses an electric forklift gantry action control system which is used for the technical field of forklift gantry control, at least one port A of a multi-way valve is used for being communicated with a rodless cavity of a lifting oil cylinder, when a controller receives a lifting signal, the controller opens the port A and controls a motor to drive an oil pump to rotate, and the lifting signal is sent to the multi-way valve; hydraulic oil in the hydraulic oil tank enters a rodless cavity of the lifting oil cylinder through the oil pump and the port A of the multi-way valve, and the opening degree of the port A and the rotating speed of the motor are gradually increased along with increase of the opening degree O of the controller; when the controller receives the lifting signal and the opening degree O of the controller is smaller than or equal to O12, the controller controls the total flow of hydraulic oil of the oil pump to be larger than the passable flow of the multi-way valve; when the controller receives the lifting signal and the opening degree O of the controller is larger than O12 and smaller than or equal to 100%, the controller controls the total flow of the hydraulic oil to be smaller than the passable flow of the multi-way valve. And throttling speed regulation is adopted at a low rotating speed, and volume speed regulation is adopted at a high rotating speed, so that not only is the micro-motion performance of gantry motion improved, but also the overall energy consumption is reduced.

The invention relates to the technical field of hydraulic pressure, and discloses a pressure-difference valve unit, a hydraulic control system and engineering machinery. The hydraulic control system comprises a hydraulic pump, a main valve, a pressure-difference valve and a controller, wherein the hydraulic pump is used for providing hydraulic oil for an actuating element under the driving effectof an engine; the main valve is used for controlling the actual output flow of the hydraulic oil from the hydraulic pump to the actuating element; the pressure-difference valve comprises a variable-quantity valve and a variable-pressure valve; a constant-pressure element is arranged at a first end of the variable-quantity valve; the variable-pressure valve is arranged at a second end of the variable-quantity valve and is used for adjusting pressure difference between the two ends of the main valve under the different rotating speeds of the engine, so that the maximum output flow of the main valve adjusted by a handle in an output flow range is equal to the output flow of the hydraulic pump; and the controller is connected with the engine and the variable-pressure valve, is used for receiving the rotating speed of the engine, and controls the output pressure of the variable-pressure valve according to the rotating speed of the engine. The whole hydraulic control system runs at high speed and meanwhile has good micro-motion performance.

The invention relates to a platform swing system and a swing control method, and particularly relates to an aerial work platform swinging system and a swing control method. The invention belongs to the technical field of aerial work platforms. A swing controller obtains the position state of a handle, the swing controller can control the working state of a switching valve, a second three-positionfour-way reversing valve, and the shunt module according to the position state of the handle, so that the speed of the swing oil cylinder driving the hanging basket is matched with the current position state of the handle, namely, different flow rates can be provided to the swing cylinder according to the position state of the handle, so that the speed of the swing oil cylinder driving swing basket can be hierarchically and discretely controlled, and the controllability and the micro-motion are high, safe and reliable. When the handle is in a neutral state, the constant-pressure variable pumpworks in a pressure cut-off state, and the output flow is almost zero,; when the handle is in the non-neutral state, the constant-pressure variable pump works in the constant pressure variable state,the flow rate is automatically adjusted according to the system demand, thereby improving the energy saving performance of the swing system.

The invention discloses a boom luffing hydraulic system, which comprises a main pump, a main valve, an luffing oil cylinder, a first oil passage and a second oil passage, the first oil passage is connected with the oil port of the first chamber of the luffing oil cylinder, The second oil circuit is connected to the oil port of the second cavity of the luffing cylinder, the first oil circuit is connected to the first working oil port of the main valve, the second oil circuit is connected to the second working oil port of the main valve, and the main pump It is connected with the oil inlet of the main valve, and a pressure control valve is arranged in the first oil circuit. It also includes a servo pump and a servo oil circuit. The servo pump supplies oil to the servo oil circuit. The servo oil circuit is connected to the pilot oil port of the pressure control valve. A hydraulic valve is arranged in the servo oil circuit, and the hydraulic valve controls the opening of the pressure control valve. Spend. The invention solves the shaking of the boom caused by the frequent opening and closing of the balance valve in the past, and improves the stability and micro-movement of the boom luffing control.

The invention provides a winch control system which comprises a winch motor, a load sensing pump and a main control valve group. The main control valve group comprises a first working oil port, a second working oil port, an oil inlet and a load feedback oil port, the first working oil port of the main control valve group is connected with a first oil port of the winch motor, the second working oil port of the main control valve group is connected with a second oil port of the winch motor, the oil inlet of the main control valve group is connected with an oil supply port of the load sensing pump, and the load feedback oil port of the main control valve group is connected with a feedback oil port of the load sensing pump. The winch control system further comprises a damping pressure-stabilizing valve group, wherein the damping pressure-stabilizing valve group is installed on the hydraulic pipe between the load feedback oil port of the main control valve group and the feedback oil port of the load sensing pump and used for retarding oil fluctuation in the winch control system. The winch control system effectively eliminates pressure fluctuation in the system, enables the motor to be capable of well working under the low-rotation-speed working condition and remarkably improves the slight movement performance of a crane hoisting mechanism.

The invention discloses a multi-way valve hydraulic system, which includes a parallel multi-way valve group connected with the actuator, and a first oil pump and a second oil pump connected with the oil supply circuit of the valve group; A confluence device, the diversion and confluence device is arranged between the second oil pump and the oil supply circuit, and when the difference between the oil supply pressure of the oil supply circuit and the load pressure of the hydraulic system is greater than a preset value, the diverter The converging device is in the first state, so that the hydraulic oil output by the second oil pump flows back to the oil tank through the dividing and converging device; when the difference is smaller than the preset value, the dividing and converging device is in the second state so that the hydraulic oil output by the second oil pump enters the oil supply passage and merges with the first oil pump. The hydraulic system can output the corresponding flow according to the flow required by the actuator, avoiding energy waste, and improving the smoothness and micro-movement of the system. The invention also discloses a crane using the above-mentioned multi-way valve hydraulic system.

The invention discloses a load sensitive hydraulic control system, comprising a multipath directional control valve and a load sensitive pump having a load sensitive valve, wherein, a liquid inlet and an oil drain port of the multipath directional control valve are respectively communicated with a liquid outlet and an oil tank of the load sensitive pump, a load feedback port of the multipath directional control valve is communicated with a sensitive cavity of the load sensitive valve, and each uniting valve oil port of the multipath directional control valve is respectively connected with the corresponding executive component; the passage between the load feedback port of the multipath directional control valve and the sensitive cavity of the load sensitive valve is provided with a damper valve; the oil duct between an oil inlet and an oil outlet of the damper valve is provided with at least two dampings, and the oil duct between the adjacent two dampings is provided with a chamber having an enlarged cross section; and the oil outlet is communicated with the load feedback port of the multipath directional control valve, and the oil inlet is communicated with the sensitive cavity of the load sensitive valve. In addition, the invention provides a crane having the load sensitive hydraulic control system.