Buffering oil cylinder

Abstract

The invention discloses a buffering oil cylinder. The buffering oil cylinder comprises a power cylinder used for connection with a load, wherein a buffering convertor is independently arranged on theexterior of the power cylinder; a power module and a buffering function module of the buffering oil cylinder are separately arranged and are connected through a channel connector; an oil line system is used for supplying oil to a buffering cavity and an oil return cavity and converting high pressure hydraulic oil from a hydraulic system into high pressure oil of a working cavity of the power cylinder, so that the power cylinder generates push force or pull force; when the power cylinder works reversely, the hydraulic oil of the working cavity of the power cylinder flows into a converting cavity of the buffering convertor so as to push a piston rod and a piston of the buffering convertor to move forwards; and when a buffering body on the piston rod enters a cushioning stroke, the flow areaof a buffering channel decreases to form a throttling channel, the pressure of the buffering cavity rapidly rises, and the pressure of the working cavity of the power cylinder also quickly rises to form resistance acting on the piston and piston rod of the power cylinder, so that a moving part of the power cylinder and a driven object gradually decelerate till stopping.

Description

【Technical field】 [0001] The invention belongs to the technical field of hydraulic oil cylinders, in particular to a buffer oil cylinder with high reliability and suitable for high-speed and heavy-load applications. 【Background technique】 [0002] The biggest advantage of hydraulic transmission is that its power-mass ratio and force-mass ratio are large, especially when it is medium and high-power and realizes linear reciprocating motion. The hydraulic cylinder is the actuator for hydraulic transmission to achieve linear reciprocating motion. When the hydraulic cylinder When the moving part and the moving object with a certain mass reciprocate quickly, there will be a lot of kinetic energy at the end of the stroke. If there is no buffer device at the end of the stroke, the moving part will brake smoothly. The inertial force and hydraulic pressure of the moving part will cause the piston to The mechanical impact with the end cover will produce impact, noise, and even damage t...

AI Technical Summary

Problems solved by technology

This buffering method has various structural forms, which can meet the smooth braking of the oil cylinder in low-speed and light-load applications, and has the advantages of compact structure and high reliability; but no matter what kind of structure it adopts, this buffering method has the following disadvantages: A problem: ①Limited by the structure and installation size of the oil cylinder, its buffer capacity is small, which cannot meet the requirements of smooth braking of the oil cylinder in high-speed and heavy-duty applications; ②Since the buffer device is arranged inside the oil cylinder, the adjustment and maintenance of the buffer device are difficult. Difficult; ③Because part of the buffer device is integrated with or connected to the moving parts of the cylinder, the machining accuracy requirements are high, especially for oil cylinders with long buffer strokes, the processing accuracy is even stricter; ④Since the buffer device may be in the The instantaneous high pressure inside the cylinder has a certain impact on the safety of the hydraulic cylinder

The second valve-controlled buffering method is to set a buffering circuit in the hydraulic circuit of the oil cylinder, and realize buffering by gradually closing the flow area of ​​the hydraulic valve of the oil return line of the oil cylinder. This buffering method can meet the buffering requirements of the oil cylinder in high-speed and heavy-duty applications. However, due to the controllable hydraulic valve that realizes buffering, there are a series of problems such as the spool is easily stuck, causing buffer failure and severe impact caused by control signal failure. This buffering method has the problem of insufficient reliability.

[0003] Although the above two buffering methods have been widely used in existing hydraulic oil cylinders, the prior art has the problem of insufficient buffering capacity or reliability, and cannot reliably realize high-speed and heavy-duty use occasions (especially some safety requirements) Extremely high occasions, such as amusement equipment, passenger elevators, etc.) smooth braking of the oil cylinder

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