Oil inlet system of 160T punch press overload protection hydraulic oil cylinder

Abstract

The invention relates to the technical field of punch press overload protection design, in particular to an oil inlet system of a 160T punch press overload protection hydraulic oil cylinder. The oil inlet system is applied to normal production of a product with punching shear in a range of 1,600 kN; and meanwhile, when the punching shear exceeds 1,600 kN, the 160T punch press overload protection hydraulic oil cylinder is unloaded to perform overload protection. According to the designed oil inlet system of the 160T punch press overload protection hydraulic oil cylinder, pressure oil is supplied by a mechanical oil pump, so that the pressure of the overload protection hydraulic oil cylinder can reach required pressure for punching and shearing normal force of 1,600 kN. By designing a high-pressure one-way valve in a hydraulic oil path, the pressure of the overload protection hydraulic oil cylinder can be maintained. By designing a high-pressure unloading overflow valve in the hydraulic oil path, the overload protection is ensured; and when the pressure of the hydraulic oil cylinder exceeds the punch press normal force, an overflow port of the unloading overflow valve is opened to perform overflowing for the overload protection. A pressure display is designed in the oil inlet system of the 160T punch press overload protection hydraulic oil cylinder and is used for checking whether the pressure is normal or not at any time.

Description

technical field [0001] The invention relates to the technical field of punch press overload protection design, in particular to an oil inlet system for a 160T punch press overload protection hydraulic cylinder. Background technique [0002] The overload protection structure of the 160T punch press has been improved from the original punch safety pad overload protection structure to the punch ball bowl piston hydraulic cylinder overload protection mechanism. The ball bowl piston hydraulic cylinder overload protection mechanism has buffering during punching and stable punching and shear protection when overload Machine tools and molds are not damaged; currently 160T, 250T, 300T, 400T and other large punching machines use hydraulic cylinder overload protection, and the pneumatic oil pump provides high pressure oil for the overload protection of the hydraulic cylinder of the punching machine. In actual use, it is found that the pneumatic oil pump provides The main reasons are: ...

AI Technical Summary

Problems solved by technology

[0002]The overload protection structure of the 160T punch press is improved from the original overload protection structure of the punch safety pad to the overload protection mechanism of the punch ball bowl piston hydraulic cylinder, and the ball bowl piston hydraulic cylinder overload protection structure. The oil cylinder overload protection mechanism has the advantages of buffering during punching, and protecting the machine tool and mold from damage when punching and shearing are stable and overloaded; at present, large punches such as 160T, 250T, 300T, and 400T use hydraulic cylinder overload protection. The pneumatic oil pump provides high-pressure oil. In actual use, it is found that the high-pressure oil pressure provided by the air-operated oil pump cannot reach the pressure required by the nominal force of the press. The main reasons are: 1. The high-pressure oil pressure provided by the air-operated oil pump is greatly affected by the compressed air pressure of the air source. Large; 2. The manufacturing quality of the pneumatic oil pump itself; the air-operated oil pump leaks seriously within a period of time, and the pressure oil provided by the pneumatic oil pump cannot reach the pressure required for the punching and shearing force of the product, so it is compressed by moving the ball bowl (oil plug) distance during punching and shearing Hydraulic cylinder oil to achieve the pressure required for the punching force during punching and shearing; during the production process, when the mold is corrected, if the pressure of the hydraulic cylinder is lower than the product or equal to the pressure required for the product’s punching and shearing force, the corrected mold will close the mold Depth During the production process, due to the loss of oil during the movement of the ball bowl oil plug, the pressure of the hydraulic cylinder drops, and the downward movement distance of the ball bowl piston hydraulic cylinder increases during punching and shearing, resulting in continuous shearing and punching during punching and shearing production. The operator ensures the production by adjusting the ball screw, but the hydraulic cylinder pressure drops to the lower limit, the pneumatic oil pump automatically works to increase the pressure of the hydraulic cylinder, the downward movement distance of the ball bowl piston decreases, and the clamping depth of the upper and lower molds deepens, resulting in punching and shearing. There are many burrs in the product, and the noise is loud when punching and shearing, which shortens the mold repair cycle, shortens the service life of the mold, and restricts production; at the same time, the manufacturing quality of the air-operated oil pump causes the service life of the air-operated oil pump to be short. Imported air-operated oil pumps or new equipment The situation is better; when it is damaged and replaced, the faults are frequent and the price of the pneumatic oil pump is expensive, each of which is tens of thousands of yuan. In view of this situation, it is necessary to redesign the oil inlet system of the 160T punch press overload protection hydraulic cylinder to meet the production requirements and ensure stable product quality. Extend mold repair cycle

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