CN102966631A - Rated flow and pressure determining method of elevator hydraulic pump - Google Patents

Abstract

The invention discloses a rated flow and pressure determining method of an elevator hydraulic pump, wherein the flow of the pump should is required to satisfy a requirement of the highest speed of an executing member and the output flow is determined according to the maximum flow and leakage amount required by a system; firstly, the output flow of the pump, the leakage factor of the system, the maximum flow required by a hydraulic cylinder actually and the number of the executing members are calculated orderly; in the working process, a system regulated with the speed by a throttle valve is always used; when the flow of the pump is determined, then the minimum overflow amount of an overflow valve is added; the working pressure of the pump is determined according to the working pressure of the hydraulic cylinder; the system of which an inlet oil line is having provided with a more complex speed-adjusting valve and a pipeline to an oil inlet is analyzed; and considering the dynamic pressure of the hydraulic system and the service life of an oil pump, generally when the oil pump is selected, the rated pressure of the oil pump is larger than the working pressure with by 25 percent to 60 percent. The method has the beneficial effects that the motion stationary and accuracy of the executing part are good for ensuring; and the safety is excellent; and meanwhile, the operation controllability and the energy-saving effect are good for increasing.

Description

A kind of rated flow and pressure of lift oil hydraulic pump are determined method

Technical field

The present invention relates to the elevator technology field, the rated flow and the pressure that relate in particular to a kind of lift oil hydraulic pump are determined method.

Background technique

Hydraulic system has that power is large, working pressure and the flow adjustability is good, heat can be brought back the advantages such as fuel tank.Lift is that a kind of lifting performance is good, goods lifting structure applied widely, can be used between the production line height difference equipment goods handling, material loading, roll off the production line, places such as the lifting of parts, large-scale hangar material loading, blanking, storage loading and unloading during the part assembling altogether support the use with the vehicle such as fork truck and the quick loading and unloading of goods etc.It adopts hydraulic system to produce more power than other devices, and under equal power, the volume of hydraulic pressure installation is little, lightweight, specific power large, compact structure; Simultaneously, the hydraulic pressure installation Comparision is steady because lightweight, inertia is little, reaction is fast, hydraulic pressure installation is easy to realize quick startup, braking and commutating frequently.Certainly also there are many shortcomings in the hydraulics that is used for lift, for example, hydraulic pressure has more energy loss, hydraulic transmission easily to reveal in transmission process, not only pollutes the work-yard, limits its application area, causes fire casualty, and affects robust motion and the correctness of do-part; Oil temperature is changed relatively more responsive, the hydraulic element accuracy of manufacturing is had relatively high expectations, involve great expense, break down and be difficult for finding reason, thereby, in the application of reality, need to reduce one by one the impact that unfavorable factor is brought to All aspects of by effective measures, particularly to the analysis of rated flow and rated pressure.

Summary of the invention

The purpose of this invention is to provide a kind of be conducive to make power system and lifting module coupling more perfect, be conducive to improve the operation controllability, the rated flow and the pressure that are conducive to improve the lift oil hydraulic pump of energy-saving effect determines method, to solve many deficiencies of prior art.

Purpose of the present invention is come specific implementation by the following technical programs:

A kind of rated flow and pressure of lift oil hydraulic pump are determined method, mainly are comprised of following steps:

⑴ the flow of pump should satisfy the requirement of executive component maximum speed, its output flow is determined according to the needed peak rate of flow of system and leakage rate, calculate at first, successively output flow, system leak coefficient, the peak rate of flow of oil hydraulic cylinder actual demand, the executive component number of pump;

⑵ in the working procedure, use all the time the system of throttle valve speed governing, when determining the flow of pump, add the minimum overflow amount of relief valve;

⑶ the working pressure of pump is determined according to the working pressure of oil hydraulic cylinder, when just calculating, analysis has the system of series flow control valve and pipeline more complicated for in-line, consider the working life of dynamic pressure and the oil pump of hydraulic system, usually when selecting oil pump, select its rated pressure than the large 25%--60% of working pressure, getting its rated pressure is 4MPa.

The rated flow of lift oil hydraulic pump of the present invention and pressure determine that the beneficial effect of method is: be conducive to make power system and lifting module coupling more perfect, guarantee rational in infrastructure, Security is good, be used in various different occasions, simultaneously, be conducive to improve operation controllability, raising energy-saving effect.

Embodiment

Rated flow and the pressure of the described lift oil hydraulic pump of the embodiment of the invention are determined method, and its key step comprises:

⑴ the flow of pump should satisfy the requirement of executive component maximum speed, its output flow is determined according to the needed peak rate of flow of system and leakage rate, calculate at first, successively output flow, system leak coefficient, the peak rate of flow of oil hydraulic cylinder actual demand, the executive component number of pump;

⑵ in the working procedure, use all the time the system of throttle valve speed governing, when determining the flow of pump, add the minimum overflow amount of relief valve;

⑶ the working pressure of pump is determined according to the working pressure of oil hydraulic cylinder, when just calculating, analysis has the system of series flow control valve and pipeline more complicated for in-line, consider the working life of dynamic pressure and the oil pump of hydraulic system, usually when selecting oil pump, select its rated pressure than the large 25%--60% of working pressure, getting its rated pressure is 4MPa.

Claims (1)

1. the rated flow of a lift oil hydraulic pump and pressure are determined method, it is characterized in that, mainly are comprised of following steps:

⑴ the flow of pump should satisfy the requirement of executive component maximum speed, its output flow is determined according to the needed peak rate of flow of system and leakage rate, calculate at first, successively output flow, system leak coefficient, the peak rate of flow of oil hydraulic cylinder actual demand, the executive component number of pump;

⑵ in the working procedure, use all the time the system of throttle valve speed governing, when determining the flow of pump, add the minimum overflow amount of relief valve;

⑶ the working pressure of pump is determined according to the working pressure of oil hydraulic cylinder, when just calculating, analysis has the system of series flow control valve and pipeline more complicated for in-line, consider the working life of dynamic pressure and the oil pump of hydraulic system, usually when selecting oil pump, select its rated pressure than the large 25%--60% of working pressure, getting its rated pressure is 4MPa.