Safety relief valve for piston type double-acting hydraulic cylinder or hydraulic jack
A double-acting hydraulic cylinder and pressure relief valve technology, applied in the field of safety relief valves, can solve problems such as hydraulic cylinder damage
Pending Publication Date: 2021-12-07
陈向华
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Problems solved by technology
Among them, the double-acting hydraulic cylinder is the most widely used, and its structure is usually composed of main parts such as rear end cover, cylinder barrel, piston rod, piston assembly, front end cover, etc. In use, the maximum movement distance of the piston is according to the design requirements of the hydraulic cylinder. Certainly, if the movement exceeds its limit position, it will cause damage to the hydraulic cylinder
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Embodiment Construction
[0033] The present invention will be described in further detail below with reference to the drawings and embodiments, but it is not intended to limit the protection scope of the present invention.
[0034] Such as Figure 1-8 As shown, a safety relief valve for a piston-type double-acting hydraulic cylinder includes an upper thimble 4, an upper steel ball 5, a spring 6, a lower steel ball 7, a lower thimble 10, a copper washer 8, and a valve body 9. Wherein the upper thimble 4 has the same structural size as the lower thimble 10; the upper steel ball 5 has the same structural size as the lower steel ball 7. The scheme is installed on the four-stage stepped hole machined in the piston of the hydraulic cylinder. The four-stage stepped hole runs through the piston up and down to communicate with the upper and lower oil chambers, and an internal thread is provided in the hole with the largest diameter at the bottom of the four-stage stepped hole to match the external thread on t...
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The invention discloses a safety relief valve for a piston type double-acting hydraulic cylinder or hydraulic jack. The safety relief valve comprises an upper steel ball, a spring, a lower steel ball and a valve body in sequence from top to bottom, the valve body is fixed in a multi-stage stepped hole of a piston and limits the upper steel ball, the spring and the lower steel ball, the valve body and the multi-stage stepped hole are sealed through a sealing gasket, an upper ejector pin is installed on the upper steel ball, a lower ejector pin is installed on the lower steel ball, the upper end of the upper ejector pin is exposed out of the upper end of the multi-stage stepped hole, and the lower end of the lower ejector pin penetrates through the whole valve body and then is exposed out of the lower end of the multi-stage stepped hole. The safety relief valve is installed in the multi-stage stepped hole of the piston and used for preventing the movement distance of the piston from exceeding the limit position, and the multi-stage stepped hole penetrates through the piston to enable an upper cavity and a lower cavity of the piston to communicate. According to the safety relief valve, by detecting the relative positions of the piston relative to an upper end cover and the bottom of the hydraulic cylinder or the hydraulic jack, when the piston reaches a limit position, the upper cavity and the lower cavity of the piston communicate to discharge hydraulic oil so as to prevent the piston from continuously moving.
Description
technical field [0001] The invention relates to a safety hydraulic component, in particular to a safety relief valve for a piston-type double-acting hydraulic cylinder or a hydraulic jack. Background technique [0002] A hydraulic cylinder or a hydraulic jack is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swing motion). It has simple structure and reliable operation. When it is used to realize reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the motion is stable, so it is widely used in various mechanical hydraulic systems. Among them, the double-acting hydraulic cylinder is the most widely used, and its structure is usually composed of main parts such as rear end cover, cylinder barrel, piston rod, piston assembly, front end cover, etc. In use, the maximum movement distance of the piston is according to the design requirements of the hydraulic c...
Claims
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IPC IPC(8): F15B15/14F15B15/20F15B13/02
CPCF15B15/14F15B15/1447F15B15/202
Inventor 陈向华
Owner 陈向华