Anti-pressure-trapping guide sleeve and stand column

Abstract

The utility model provides an anti-pressure-trapping guide sleeve and a stand column. The anti-pressure-trapping guide sleeve comprises a guide sleeve component and an anti-pressure-trapping component. The guide sleeve component comprises an outer cylinder body, a middle cylinder body, a bottom valve, a guide outer sleeve, a rod sealing mounting groove and a dustproof ring mounting groove, and the middle cylinder body is arranged in the outer cylinder body; the bottom valve is arranged at one end of the guide sleeve component, the guide outer sleeve is arranged at the other end of the guide sleeve component, and the rod sealing installation groove and the dustproof ring installation groove are formed in the inner wall of the guide outer sleeve. The pressure trapping prevention component is arranged on the guide outer sleeve and communicated with a cavity between the rod sealing installation groove and the dustproof ring installation groove. Air pressure inside and outside the cylinder body can be balanced, the dustproof ring is prevented from being extruded, the dustproof ring protection problem is effectively solved, and the reliability and service life of the oil cylinder are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of mining hydraulic equipment, and particularly relates to a trapped pressure preventing guide sleeve and stand. BACKGROUND

[0002] The guide sleeve is a key component in the oil cylinder structure and is mainly used for sealing, dust prevention and guiding. In a harsh environment such as a coal mine, there are more dust and impurity liquids, and the dust prevention ring plays an especially important role. Once the dust prevention ring is damaged or extruded during operation, dust will enter the inside of the oil cylinder, damaging the guide ring and the seal, and causing the oil cylinder to fail to work normally, which seriously affects the operation of the support and the progress of the coal mining operation. In addition, when the design of the dust prevention ring has too large a holding force, pressure will be generated in the cavity between the dust prevention ring and the rod seal, which easily causes the trapped pressure phenomenon. When the trapped pressure cannot be discharged in time and reaches a certain value, the dust prevention ring will be extruded, and this problem is particularly prominent in the structure of the hydraulic support stand.

[0003] The utility model with the publication number CN221144894U discloses a kind of oil cylinder buffer device for hydraulic oil pumping unit, and the scheme includes cylinder body, cylinder head, flange and buffer device.When piston rod is subjected to lateral force, part of lateral force is absorbed by buffer spring in buffer device, so that piston rod is bent and deformed along conical inclined plane, reduce the lateral force that guide sleeve bears, prolong the service life of oil cylinder.The scheme although reduces the abrasion of lateral force to sealing element, improves the reliability of oil cylinder, but the device mainly concerns the buffer of lateral force, and there is no effective solution to the protection of dust prevention ring and the problem of trapped pressure. UTILITY MODEL CONTENT

[0004] In order to overcome the problem that the guide sleeve dust prevention ring in the prior art is easily damaged or extruded in a harsh environment, causing pollution inside the oil cylinder, and the problem that the dust prevention ring has too large a holding force, causing pressure and trapped pressure phenomenon, the utility model provides a trapped pressure preventing guide sleeve and stand, which can balance the internal and external air pressure, prevent the dust prevention ring from being extruded, and prevent dust and liquid from entering the cavity, effectively solving the problem of dust prevention ring protection, improving the reliability and service life of the oil cylinder, and being suitable for harsh environments such as coal mines.

[0005] The utility model solves the technical problems by adopting the technical scheme of a trapped pressure preventing guide sleeve and stand, characterized by comprising a guide sleeve component and a trapped pressure preventing component, the guide sleeve component comprises an outer cylinder body, a middle cylinder body, a bottom valve, a guide outer sleeve, a rod seal installation groove and a dust prevention ring installation groove, the middle cylinder body is arranged inside the outer cylinder body, the bottom valve is arranged at one end of the guide sleeve component, the guide outer sleeve is arranged at the other end of the guide sleeve component, the rod seal installation groove and the dust prevention ring installation groove are arranged on the inner wall of the guide outer sleeve, and the trapped pressure preventing component is arranged on the guide outer sleeve and communicates the cavity between the rod seal installation groove and the dust prevention ring installation groove.

[0006] The anti-trapping guide sleeve further comprises a small column, which is arranged inside the middle cylinder body.

[0007] The anti-pressure component also includes a through hole, which passes through the outer wall and the inner wall of the guide sleeve. The through hole is located at one end of the outer wall of the guide sleeve and is connected to the external atmospheric environment. The through hole is located at one end of the inner wall of the guide sleeve and is connected to the cavity between the rod seal mounting groove and the dust ring mounting groove. The film is a waterproof, dustproof and breathable film.

[0008] A breathing valve is provided in the anti-pressure component.

[0009] The breathing valve is equipped with a waterproof, dustproof and breathable membrane.

[0010] The column includes the above-mentioned anti-pressure guide sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a structural diagram of an anti-trapping guide sleeve and a column of the utility model;

[0013] Figure 2 This is a partial structural diagram of an anti-pressure guide sleeve and column sealing assembly of the utility model;

[0014] Figure numerals: 1. Guide sleeve component; 2. Anti-pressure component; 3. Outer cylinder body; 4. Middle cylinder body; 5. Small column; 6. Bottom valve; 7. Guide sleeve; 8. Rod seal mounting groove; 9. Dust ring mounting groove; 10. Through hole; 11. Breathing valve. DETAILED DESCRIPTION

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] In the present application, unless otherwise explicitly specified and limited, the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0017] As shown in Figure 1 and Figure 2 A kind of anti-trapping pressure guide sleeve and stand, it is characterized in that including guide sleeve component 1 and anti-trapping component 2;The guide sleeve component 1 includes outer cylinder 3, middle cylinder 4, bottom valve 6, guide outer sleeve 7, rod seal installation groove 8, and dustproof ring installation groove 9, the middle cylinder 4 is set to the inside of outer cylinder 3;The bottom valve 6 is arranged at one end of guide sleeve component 1, the guide outer sleeve 7 is arranged at the other end of guide sleeve component 1, the rod seal installation groove 8 and dustproof ring installation groove 9 are arranged in the inner wall of guide outer sleeve 7;The anti-trapping component 2 is arranged on guide outer sleeve 7, and the cavity between the rod seal installation groove 8 and dustproof ring installation groove 9 is communicated.

[0018] The small column 5 is arranged in the middle cylinder 4.

[0019] The anti-trapping component 2 further includes through hole 10, the through hole 10 penetrates the outer wall and inner wall of guide outer sleeve 7, the through hole 10 is located at one end of the outer wall of guide outer sleeve 7 and is communicated with external atmosphere, the through hole 10 is located at one end of the inner wall of guide outer sleeve 7 and is connected with the cavity between the rod seal installation groove 8 and dustproof ring installation groove 9.

[0020] Breathing valve 11 is arranged in the anti-trapping component 2.

[0021] The layout design of the air hole 14 is along linear path into cavity.

[0022] The breathing valve 11 is installed with waterproof and dustproof air-permeable film.

[0023] The stand includes the anti-trapping pressure guide sleeve described above.

[0024] In actual use, in order to solve the problem of pressure caused by the too large holding force of the dustproof ring, a through hole 10 is arranged on the guide sleeve member 1, and a cavity is communicated between the rod sealing installation groove 8 and the dustproof ring installation groove 9, an orifice installation breather valve 11 is arranged, a waterproof and dustproof breathable film is arranged in the breather valve 11, the film can isolate dust and water and keep gas flowing. When gas pressure is generated in the cavity, the gas enters the breather valve 11 through the hole, and is discharged through the waterproof and dustproof breathable film, so that the internal and external gas pressure is balanced, and dust and liquid are prevented from entering the cavity.

[0025] The utility model has the advantages that: through setting waterproof and dustproof breathable film, can effectively prevent outside moisture and dust from entering the guide sleeve member, and keep the internal air pressure balance, prevent the guide sleeve member from being stuck due to the change of gas pressure; through the through hole design, the air resistance can be reduced, the ventilation efficiency can be improved, and the reliability and stability of the guide sleeve member in different working environments can be ensured; through setting the rod sealing installation groove and the dustproof ring installation groove, the sealing performance of the guide sleeve member can be further enhanced, the service life can be prolonged, and the maintenance cost can be reduced.

[0026] Finally, it should be noted that: the above only for the preferred embodiments of the utility model, and does not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for the person skilled in the art, still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features, any modification, equivalent replacement, improvement etc. in the spirit and principles of the utility model, should be contained in the protection scope of the utility model.

Claims

1. An anti-trapping guide sleeve, characterized by: The invention comprises a guide sleeve component (1) and an anti-trapping component (2); the guide sleeve component (1) comprises an outer cylinder body (3), a middle cylinder body (4), a bottom valve (6), a guide outer sleeve (7), a rod seal mounting groove (8), and a dust ring mounting groove (9); the middle cylinder body (4) is arranged inside the outer cylinder body (3); The bottom valve (6) is arranged at one end of the guide sleeve component (1), the guide outer sleeve (7) is arranged at the other end of the guide sleeve component (1), and the rod seal mounting groove (8) and the dust ring mounting groove (9) are arranged on the inner wall of the guide outer sleeve (7); The anti-trapping component (2) is arranged on the guide sleeve (7) and communicates with the cavity between the rod seal installation groove (8) and the dust ring installation groove (9).

2. The anti-pressure guide sleeve according to claim 1, characterized in that: It also includes a small column (5), which is arranged inside the middle cylinder (4).

3. The anti-pressure guide sleeve according to claim 1 or 2, characterized in that: The anti-pressure component (2) also includes a through hole (10), which passes through the outer wall and the inner wall of the guide sleeve (7). The through hole (10) is located at one end of the outer wall of the guide sleeve (7) and is connected to the external atmospheric environment. The through hole (10) is located at one end of the inner wall of the guide sleeve (7) and is connected to the cavity between the rod seal mounting groove (8) and the dust ring mounting groove (9).

4. The anti-pressure guide sleeve according to claim 3, characterized in that: A breathing valve (11) is provided in the anti-pressure component (2).

5. The anti-pressure guide sleeve according to claim 4, characterized in that: The breathing valve (11) is equipped with a waterproof, dustproof and breathable membrane.

6. A column, characterized in that: The column includes an anti-trapping guide sleeve as described in any one of claims 1, 2, 4 and 5.

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