Hydraulic upright column capable of operating stably

Abstract

The invention provides a hydraulic upright column capable of reducing the oil return resistance, preventing failure of the upright column and operating stably. According to the technical scheme, the hydraulic upright column capable of operating stably comprises a support base, a top sealing cover, positioning bolts, a piston, an upper body cylinder cover, an upright column body, bottom covers, reset springs, sliding valves, guide rings and a hydraulic control system; the upper body cylinder cover and a starting gate are arranged on the top end of the upright column; the piston is arranged in an inner cavity of the upright column body; the support base and the top sealing cover are connected to the top end of the piston; each of the piston, the top sealing cover and the support base is fixedly arranged by means of the positioning bolts; the reset spring, the bottom cover, the sliding valve and the guide ring are respectively arranged in the inner cavity and on the lower end of the piston, as well as on the upright column body; one end of each reset spring is connected with the top sealing cover, and the other end of each reset spring is connected with the corresponding bottom cover; the hydraulic control system is correspondingly communicated with cavity bodies on the upper side and the lower side of the piston. The hydraulic upright column is mainly used for an oil path system of an upright column cylinder under a coal mine.

Description

technical field [0001] The invention provides a hydraulic column capable of stable operation, belonging to the technical field of coal mine bottom hydraulic supports. Background technique [0002] The hydraulic column is a kind of support and protection equipment that is widely used in underground mines. At present, this kind of hydraulic column is mainly composed of columns, pistons, upper cylinder heads, slide valves, supports, sealing covers and sealing elements. Among them, in the piston structure of the hydraulic column, the piston that plays the main role bears all the weight. In this way, the outer circle of the piston has to be made into two sections with different diameters. High coaxiality, so the existing piston mechanism has complex structure, complicated process, and difficult to guarantee the accuracy. In addition, because the required accuracy cannot be guaranteed, the service life of the column piston mechanism will be reduced and the manufacturing cost will ...

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Problems solved by technology

[0002] The hydraulic column is a kind of support and protection equipment that is widely used in underground mines. At present, this kind of hydraulic column is mainly composed of columns, pistons, upper cylinder heads, slide valves, supports, sealing covers and sealing elements. Among them, in the piston structure of the hydraulic column, the piston that plays the main role bears all the weight. In this way, the outer circle of the piston has to be made into two sections with different diameters. High coaxiality, so the existing piston mechanism has complex structure, complicated process, and difficult to guarantee the accuracy. In addition, because the required accuracy cannot be guaranteed, the service life of the column piston mechanism will be reduced and the manufacturing cost will be higher. High, poor interchangeability, inconvenient maintenance and replacement defects

[0003] Moreover, with the development of the fully mechanized mining industry, the hydraulic support is developing towards a large mining height, and the cylinder diameter of the column is also increased accordingly, and the area difference between the piston cavity and the active column cavity is also increased. In addition, the inner diameter of the return (inlet) liquid hose of the active column cavity is smaller. , when the liquid returns to the liquid, it passes through the tee, the hydraulic control check valve, the reversing valve, the stop valve, the liquid return cut-off valve, etc., forming a large total resistance; and the working face of the large mining height hydraulic support is mostly equipped with a large Flow rate emulsion pump, the main liquid inlet pipe of the liquid supply system is also relatively thick, and the inner diameter of the rubber hose and the pipe joint inner diameter of the column piston chamber liquid supply system are thicker than the inner diameter of the piston chamber liquid return system rubber hose. Due to the above factors, when the column is raised, the piston chamber A pressurized chamber is formed to thicken the deformation of the column cylinder mouth to varying degrees. If the thickening value exceeds the compression amount of the guide sleeve sealing ring, it will cause liquid leakage. If permanent deformation occurs, the column will fail

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