阅读说明：本技术 一种双框架板片液压机油缸与柱塞的密封结构 (Sealing structure for oil cylinder and plunger of double-frame plate hydraulic press ) 是由 张振 王凤 于 2019-09-26 设计创作，主要内容包括：本发明公开一种双框架板片液压机油缸与柱塞的密封结构,包括油缸的缸筒以及与所述缸套配合的柱塞,所述柱塞的外圆面上形成台阶状的密封圈安装结构,所述台阶状的密封圈安装结构与缸筒之间形成密封圈安装空间,安装在所述台阶状的密封圈安装结构上的密封圈的下端近缸筒的内壁一侧形成向上倾斜的斜面结构,所述斜面结构与缸筒之间设置有截面为三角形状的保护垫圈,以避免密封圈挤入所述缸筒与柱塞的间隙中。本发明可以避免油缸的漏油的发生。(The invention discloses a sealing structure of a cylinder and a plunger of a double-frame plate hydraulic press, which comprises a cylinder barrel of the cylinder and the plunger matched with the cylinder barrel, wherein a step-shaped sealing ring installation structure is formed on the outer circular surface of the plunger, a sealing ring installation space is formed between the step-shaped sealing ring installation structure and the cylinder barrel, an inclined surface structure which is inclined upwards is formed at one side, close to the inner wall of the cylinder barrel, of the lower end of a sealing ring installed on the step-shaped sealing ring installation structure, and a protective gasket with a triangular section is arranged between the inclined surface structure and the cylinder barrel so as to prevent the sealing ring from being squeezed into a gap between the cylinder barrel. The invention can avoid oil leakage of the oil cylinder.)

1. The utility model provides a seal structure of double-frame plate hydraulic press hydro-cylinder and plunger, including the cylinder of hydro-cylinder and with cylinder liner complex plunger, form the sealing washer mounting structure of step form on the outer disc of plunger, form sealing washer installation space between the sealing washer mounting structure of step form and the cylinder, its characterized in that installs the inner wall one side of the nearly cylinder of lower extreme of the last sealing washer of step form forms the inclined plane structure of tilt up, be provided with the protecting washer that the cross-section is the triangle-shaped form between inclined plane structure and the cylinder to avoid the sealing washer to crowd into in the clearance of cylinder and plunger.

2. The seal structure for the cylinder and the plunger of the double-frame plate hydraulic press according to claim 1, wherein the outer side surface of the protective washer is in sliding contact with the inner wall surface of the cylinder tube, the lower end surface of the protective washer is in contact with the step surface of the stepped seal ring mounting structure and completely seals and shields the gap between the cylinder tube and the plunger at the upper part, and the inclined surface is in contact with the inclined surface structure.

Technical Field

The invention relates to the technical field of double-frame plate hydraulic presses, in particular to a sealing structure of an oil cylinder and a plunger of a double-frame plate hydraulic press.

Background

In modern manufacturing industry, hydraulic presses of more than 3000T are required for processing metal sheets, and the metal sheets need high unit pressure when deformed, so that the working pressure of the press must be greatly increased. At present, domestic double-frame sheet hydraulic machines for forming occupy a large share in the compression forming process of civil plate heat exchangers. The cylinder barrel of the oil cylinder of the existing double-frame plate hydraulic machine is an elastic body, and the cylinder barrel expands along with the increase of the liquid pressure, so that the expansion amount of the cylinder body is a key parameter, the larger the expansion amount is, the larger the gap relative to a plunger is, and the larger the gap is, the poorer the sealing effect and the service life of the seal are. The technology adopted for preventing oil leakage is to install a sealing ring between a cylinder barrel and a plunger piston, but the existing sealing device has poor sealing effect and cannot completely prevent oil leakage. Therefore, improvements are necessary.

Disclosure of Invention

The invention aims to provide a sealing structure for an oil cylinder and a plunger of a double-frame plate hydraulic press aiming at the technical defects in the prior art.

The technical scheme adopted for realizing the purpose of the invention is as follows:

the utility model provides a seal structure of double-frame plate hydraulic press hydro-cylinder and plunger, including the cylinder of hydro-cylinder and with cylinder liner complex plunger, form step form sealing washer mounting structure on the excircle face of plunger, form sealing washer installation space between step form sealing washer mounting structure and the cylinder, install the inner wall one side of the nearly cylinder of lower extreme of the last sealing washer of step form sealing washer mounting structure forms the inclined plane structure of tilt up, be provided with the protecting washer that the cross-section is the triangle-shaped form between inclined plane structure and the cylinder to avoid the sealing washer to crowd into in the clearance of cylinder and plunger.

The outer side face of the protection washer is in sliding contact with the inner wall face of the cylinder barrel, the lower end face of the protection washer is in contact with the step face of the step-shaped sealing ring mounting structure, the gap between the cylinder barrel and the plunger is completely sealed and shielded above, and the inclined face of the protection washer is in contact with the inclined face structure.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the lower end of the sealing ring arranged on the step-shaped sealing ring mounting structure is close to one side of the inner wall of the cylinder barrel to form an inclined plane structure which inclines upwards, and a protective gasket with a triangular section is arranged between the inclined plane structure and the cylinder barrel, so that the sealing ring is prevented from being squeezed into a gap between the cylinder barrel and the plunger piston, and oil leakage of the oil cylinder can be avoided.

Drawings

Fig. 1 is a schematic view showing a sealing structure between a cylinder and a plunger of a double-frame plate hydraulic press.

Fig. 2 is a schematic view showing the forced movement of a protective washer of a sealing structure of a cylinder and a plunger of a double-frame plate hydraulic press.

Fig. 3-5 are views showing the working state of the sealing structure of the oil cylinder and the plunger in the prior art.

Detailed Description

The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1-2, the sealing structure of the oil cylinder and the plunger of the double-frame plate hydraulic press comprises a cylinder barrel 1 of the oil cylinder and a plunger 3 matched with the cylinder barrel, wherein a step-shaped sealing ring installation structure is formed on the outer circular surface of the plunger, a sealing ring installation space 6 is formed between the step-shaped sealing ring installation structure and the cylinder barrel, an inclined surface structure which is inclined upwards is formed at one side, close to the inner wall of the cylinder barrel, of the lower end of a sealing ring 2 installed on the step-shaped sealing ring installation structure, and a protective gasket 4 with a triangular cross section is arranged between the inclined surface structure and the cylinder barrel so as to prevent the sealing ring from being squeezed into a gap 5 between the cylinder.

Due to the adoption of the structure, under the action of the radial force F, the protective gasket 4 with the triangular section moves as shown in figure 2, so that the sealing ring is prevented from being squeezed into the gap 5 between the cylinder barrel and the plunger piston, and oil leakage is prevented.

The triangle shape can be a right-angle triangle shape or an isosceles right-angle triangle shape.

The outer side surface of the protection gasket is in sliding contact with the inner wall surface of the cylinder barrel, the lower end surface of the protection gasket is in contact with the step surface of the step-shaped sealing ring mounting structure and completely seals and shields the gap between the cylinder barrel and the plunger at the upper part, and the inclined surface of the protection gasket is in contact with the inclined surface structure.

In the sealing structure in the prior art shown in fig. 3-5, the bottom surface of the sealing ring 20 between the cylinder and the plunger is a plane, the protective gasket at the bottom is a gasket 40 with a rectangular cross section, the expansion amount of the sealing ring relative to the cylinder is large (generally 3/1000) under the action of large liquid pressure in the working state above the gap 50 between the cylinder and the plunger, and the diameter of the gasket cannot follow up, when the plunger moves relative to the cylinder, the sealing ring is squeezed into the gap between the cylinder and the plunger under large pressure, the sealing ring is gradually damaged to cause oil leakage, and the recovery becomes small during pressure relief, as shown in fig. 5, the oil leakage of the cylinder can be caused in this situation, but after the triangular protective gasket is adopted in the invention, the occurrence of the situation is completely avoided, and the oil leakage phenomenon of the cylinder is completely avoided.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the lower end of the sealing ring arranged on the step-shaped sealing ring mounting structure is close to one side of the inner wall of the cylinder barrel to form an inclined plane structure which inclines upwards, and a protective gasket with a triangular section is arranged between the inclined plane structure and the cylinder barrel, so that the sealing ring is prevented from being squeezed into a gap between the cylinder barrel and the plunger piston, and oil leakage of the oil cylinder can be avoided.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.