Single-acting plunger type buffering hydraulic oil cylinder

Abstract

The invention discloses a single-acting plunger type buffering hydraulic oil cylinder comprising a cylinder body, a piston and a plunger rod, wherein the lower part of the cylinder body is a cylinder bottom; an oil cavity is arranged between the cylinder bottom and a piston; an oil port is communicated from the cylinder bottom and with the oil cavity and is provided with a limited valve core which can reciprocate in the piston; the valve core is provided with a plurality of radial holes; and the radial holes are communicated with the oil cavity and the oil port. The single-acting plunger type buffering hydraulic oil cylinder prevents a piston body from impacting the cylinder bottom, also prevents tremble caused by a second-level movable door frame and a first-level fixed door frame due to intense impact, and ensures the strength and the stable work of a hydraulic oil cylinder and a whole hydraulic system of a fork lift.

Description

Technical field: [0001] The invention relates to an oil cylinder, in particular to a single-acting plunger type buffer hydraulic oil cylinder. Background technique: [0002] At present, the main lifting cylinder of the two-stage gantry free lifting of the forklift is a single-acting plunger hydraulic cylinder. figure 1 The oil cylinder includes cylinder body 1, plunger rod 2, and piston 3. The process of extending the plunger rod 2 is called the hydraulic cylinder lifting process, which is hereinafter referred to as the oil cylinder lifting process, and the process of the plunger rod retracting to the cylinder body is called the hydraulic cylinder lowering process. The process is hereinafter referred to as the lowering of the oil cylinder. combine figure 2 , the lifting of the oil cylinder is realized in this way, the hydraulic oil enters the oil chamber 6 from the oil port 5 of the cylinder bottom 4, and the piston 3 and the plunger rod 2 are lifted up by pressure, such ...

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Problems solved by technology

to combine figure 2 , the lifting of the oil cylinder is realized in this way, the hydraulic oil enters the oil chamber 6 from the oil port 5 of the cylinder bottom 4, and the piston 3 and the plunger rod 2 are lifted up by pressure, such as figure 1 As shown, when the piston 3 descends, it descends with a certain acceleration under the action of gravity of the plunger rod, mast and goods, and impacts the bottom of the cylinder at a speed of about 400mm / s and great inertia when approaching the bottom of the cylinder, and the piston There will be a strong impact with the cylinder bottom, the secondary movable mast and the primary fixed mast, which will cause the tremor of the forklift, which will inevitably seriously affect the strength and normal operation of the hydraulic cylinder and the entire hydraulic system.

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