Liquid filling valve, liquid filling valve installing structure and hydraulic machine

Abstract

The invention discloses a liquid filling valve, a liquid filling valve installing structure and a hydraulic machine. The liquid filling valve comprise a valve body and a valve element, wherein the valve element is positioned in the valve body, a first oil inlet is formed in one end of the valve body, a first oil passing opening is formed in the other end of the valve body, second oil passing openings and a second oil inlet are formed in the outer wall of the valve body, the valve element is movably arranged between the first oil inlet and the first oil passing opening, when the valve element is located at the first oil passing opening, the first oil passing opening and the second oil passing openings are disconnected, oil inlet of the first oil inlet enables the valve element to move fromthe first oil inlet to the first oil passing opening, a floating cavity communicating with the second oil inlet is arranged between the outer wall of the valve element and the inner wall of the valvebody, the second oil inlet introduces oil to the floating cavity so as to enable the valve element to move from the first oil inlet to the first oil passing opening, the plurality of second oil passing openings are formed, an annular cavity is formed in the inner wall of the valve body, and the second oil passing openings communicate with the annular cavity. After the first oil passing opening andthe valve element are separated, the second oil passing openings are larger in unloading area, and therefore high in unloading speed.

Description

[0001] 【Technical Field】 [0002] The invention relates to a filling valve, a filling valve installation structure and a hydraulic press, belonging to the field of hydraulic presses. [0003] 【Background technique】 [0004] The function of the filling valve for hydraulic machines is to quickly replenish oil when the cylinder is descending due to its own weight, and to discharge oil when returning. The main problems existing in the filling valve at present: [0005] 1. The sealing process relies on elastic, and the spring is easily damaged; [0006] 2. When the charging valve is opened, the high pressure side of the cylinder needs to be relieved first. After reducing the pressure, the valve core is opened by the piston rod of the small cylinder above. Under normal circumstances, it is difficult to completely relieve the pressure on the high pressure side of the cylinder, causing the piston rod of the small cylinder to bend damage; [0007] 3. Because the charging valve needs to be unload...

AI Technical Summary

Problems solved by technology

[0005] 1. The sealing process relies on springs, and the springs are easily damaged;

[0006] 2. When the filling valve is opened, it is necessary to release the pressure on the high pressure side of the oil cylinder first. After the pressure is reduced, the valve core is opened by the piston rod of the upper small oil cylinder. Generally, it is difficult to completely relieve the pressure on the high pressure side of the oil cylinder, causing the piston rod of the small oil cylinder to bend. damage;

[0007] 3. Because the filling valve needs to unload the oil cylinder first, this is achieved by connecting the relatively slender oil pipe to the oil cylinder. The slender oil pipe leads to incomplete pressure relief, and the pressure relief time is relatively long;

[0008] 4. The impact of the cylinder pressure relief process is relatively serious

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