CN114352605A

CN114352605A - Outer sealing structure of hydraulic cylinder

Info

Publication number: CN114352605A
Application number: CN202210274483.9A
Authority: CN
Inventors: 刘兴彬; 刘强
Original assignee: Xuzhou Qianghong Hydraulic Technology Co ltd
Current assignee: Xuzhou Qianghong Hydraulic Technology Co ltd
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2022-04-15
Anticipated expiration: 2042-03-21
Also published as: CN114352605B

Abstract

The invention discloses an external sealing structure of a hydraulic cylinder, which belongs to the field of cylinder sealing, wherein in the moving process of a piston rod, a sealing assisting cover on a moving side end cover moves towards a ring body under the action of gradually increased oil pressure so as to extrude the ring body and deform the ring body in the radial direction, so that the contact area between the ring body and the inner wall of the hydraulic cylinder is greatly increased, the sealing effect is improved, when the ring body is aged, the toughness of the ring body is weakened, the moving span of the sealing assisting cover is enlarged, the pressed shape of the ring body is changed greatly, the contact area between the ring body and the inner wall is larger, the problem of poor sealing caused by aging is effectively solved, and the occurrence of external leakage is effectively avoided; in addition, when the interior state of leaking appearing, because the oil pressure reduces, lead to diminishing from the atress of reset connection layer department, interior compound light hemisphere diminishes, leads to the diminishing condition that the data all obviously appears on the sensor to just carry out the early warning to the staff in the interior initial stage of leaking appearing, reduce the influence.

Description

Outer sealing structure of hydraulic cylinder

Technical Field

The invention relates to the field of oil cylinder sealing, in particular to an outer sealing structure of a hydraulic oil cylinder.

Background

The seal is a mechanism for preventing leakage (internal and external leakage) of the working medium and preventing foreign substances such as air, dust, water, etc. from entering the hydraulic components and the hydraulic system.

In order to ensure that hydraulic oil in the oil cylinder is not easy to leak, a sealing ring is arranged outside an end cover and is in extrusion contact with the inner wall of the oil cylinder and the surface of the end cover to realize sealing, the sealing at the position is static sealing, but when the oil cylinder is in an extrusion state for a long time, the sealing ring is easy to age, so that the sealing performance is gradually weakened, and the leakage is caused; in addition, the external leakage can be found by naked eyes, but when the internal leakage occurs at the dynamic seal part between the piston rod and the oil cylinder, the internal leakage is generally judged by the change of the oil temperature or the action change of the oil temperature in the prior art, and the internal leakage can be found only after the internal leakage occurs for a relatively long time and is difficult to be found at the initial stage, so that the precision and the quality of the product produced by using the oil cylinder are influenced.

Disclosure of Invention

Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide an external sealing structure of a hydraulic cylinder, wherein in the moving process of a piston rod, a sealing assisting cover on a moving side end cover moves towards a ring body under the action of gradually increased oil pressure so as to extrude the ring body and deform the ring body in the radial direction, so that the contact area between the ring body and the inner wall of the cylinder is greatly increased, the sealing effect is improved, when the ring body is aged, the toughness of the ring body is weakened, the moving span of the sealing assisting cover is increased, the pressed shape of the ring body is greatly changed, the contact area between the ring body and the inner wall is larger, the problem of poor sealing caused by aging is effectively solved, and the external leakage condition is effectively avoided; in addition, when the interior state of leaking appearing, because the oil pressure reduces, lead to diminishing from the atress of reset connection layer department, interior compound light hemisphere diminishes, leads to the diminishing condition that the data all obviously appears on the sensor to just carry out the early warning to the staff in the interior initial stage of leaking appearing, reduce the influence.

Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

The utility model provides an external seal structure of hydraulic cylinder, establishes including the cover and helps the closing cap at the ring body that the hydro-cylinder end cover is close to the interior outer end of hydro-cylinder and be close to the interior end clearance fit of hydro-cylinder with the end cover, help closing cap and ring body mutual contact, help fixedly connected with from restoring to the throne even layer between the terminal surface of closing cap and hydro-cylinder end cover, the ring body is hollow circular structure, the gentle ring that props in having placed in the cavity inner chamber of ring body, interior gentle ring that props includes two surrounding layers, is located two positive garrulous balls between the surrounding layer and is located the inboard interior muscle ring of surrounding layer, fixedly connected with a plurality of evenly distributed's spacing rope between interior muscle ring and the surrounding layer inner wall, it is inboard to be located the inside unsaturated packing of surrounding layer has inside lining liquid.

Further, the surrounding layer is in a folded state, vacuumizing treatment is carried out after lining liquid is poured into the inner side surrounding layer, and LINE-X coating layers are coated on the inner surface and the outer surface of the surrounding layer.

Furthermore, the filling degree of the lining liquid is 70-85%, and the lining liquid is consistent with hydraulic oil of an applicable oil cylinder.

Furthermore, the positive type broken ball is a high-temperature-resistant fragile structure, and the limiting rope is made of a high-temperature-resistant elastic structure.

Further, it is equipped with a plurality of evenly distributed's the gasbag that resets and a plurality of fixed connection in a plurality of interior compound light hemispheres that are close to the end cover inner wall to link the in situ from resetting, it is a plurality of interior compound light hemispheres distribute with a plurality of gasbag that reset each other at intervals respectively, still install pressure sensor and light sensor from the inner wall that the layer is close to the end cover that resets, and reset the gasbag both ends all with link the inner wall fixed connection from resetting.

Furthermore, the inner double-light hemisphere comprises a supporting plate fixed with the self-resetting connecting layer and a double-light layer fixedly connected to the outer end of the supporting plate, the supporting plate is made of a hard material, and the double-light layer is made of an elastic material.

Further, the light sensing end of the light sensor is lower than the force measuring end of the pressure sensor, and the force measuring end of the pressure sensor is higher than the edge of the supporting plate.

Further, in the longitudinal direction, the inner wall of the maximum span of the double-light layer is fixedly connected with a fluorescent flexible ring, the double-light layer is of a double-layer structure, a plurality of shading row rings are fixedly connected inside the double-layer double-light layer, and the cross sections of the shading row rings completely cover the outer surface of the fluorescent flexible ring.

Furthermore, two adjacent shading row rings are mutually contacted, the position of the complex light layer corresponding to the shading row rings is of a transparent structure, and the rest part of the complex light layer is of an opaque structure.

Furthermore, the edge section of the ring body close to the inner wall of the oil cylinder is of a double-convex structure, a U shape is formed between the double convex structures, a sealing ring is embedded in the U shape, the outer surface of the sealing ring is lower than the convex surface, and the surfaces of the sealing ring and the convex surface are both in contact with the inner wall of the oil cylinder.

Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) in the scheme, in the moving process of the piston rod, the sealing-assisting cover on the moving side end cover moves towards the ring body under the action of gradually increased oil pressure, so that the ring body is extruded and radially deformed, the contact area with the inner wall of the oil cylinder is greatly increased, the sealing effect is improved, when the ring body is aged, the toughness of the ring body is weakened, the moving span of the sealing-assisting cover is increased, the pressed shape of the ring body is changed greatly, the contact area with the inner wall is larger, the problem of poor sealing caused by aging is effectively solved, and the leakage condition is effectively avoided; in addition, when the interior state of leaking appearing, because the oil pressure reduces, lead to diminishing from the atress of reset connection layer department, interior compound light hemisphere diminishes, leads to the diminishing condition that the data all obviously appears on the sensor to just carry out the early warning to the staff in the interior initial stage of leaking appearing, reduce the influence.

Drawings

FIG. 1 is a schematic view of the present invention when installed on a cylinder end cap;

FIG. 2 is a schematic view of the structure at A in FIG. 1;

FIG. 3 is a schematic structural view of a cross section of the ring body of the present invention;

FIG. 4 is a schematic structural view of a cross section of the inner compliant ring of the present invention;

FIG. 5 is a schematic structural view of a seal ring of the present invention in cross section after receiving;

FIG. 6 is a schematic structural view of a self-resetting landing layer of the present invention;

FIG. 7 is a schematic cross-sectional view of a portion of the middle of a self-resettable tie layer of the present invention;

FIG. 8 is a schematic view of the structure of the inner composite hemisphere of the present invention when being squeezed;

fig. 9 is a schematic structural view of a cross section of the ring body in embodiment 2 of the present invention.

The reference numbers in the figures illustrate:

the device comprises a ring body 1, a sealing-aid cover 2, a self-resetting connecting layer 3, an inner flexible support ring 4, an outer cladding layer 41, a positive broken ball 42, an inner rib ring 43, a limiting rope 5, a supplementary sealing ring 6, a resetting air bag 7, an inner light-recovering hemisphere 8, a supporting plate 81, a light-recovering layer 82, a fluorescent flexible ring 91 and a light-shielding row ring 92.

Detailed Description

The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; but not all embodiments, are based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1-2, a in the drawings shows an end cover, an external sealing structure of a hydraulic cylinder includes a ring body 1 sleeved on the end cover of the cylinder near the inner and outer ends of the cylinder and an auxiliary sealing cover 2 in clearance fit with the end cover near the inner end of the cylinder, the auxiliary sealing cover 2 and the ring body 1 are in contact with each other, and a self-resetting connection layer 3 is fixedly connected between the auxiliary sealing cover 2 and the end surface of the end cover of the cylinder.

Referring to fig. 3-4, the ring body 1 is a hollow circular structure, when the ring body is hollow, it deforms faster and easier in the radial direction when being stressed, so that the sealing performance is better, the inner flexible support ring 4 is placed in the hollow inner cavity of the ring body 1, the inner flexible support ring 4 plays a flexible supporting effect on the ring body 1 in the hollow cavity, so that when it is stressed and deformed, the angle of local deformation is not too large, and the cracking caused by stress concentration in the ring body 1 is effectively avoided, the inner flexible support ring 4 includes two outer claddings 41, a positive broken ball 42 located between the two outer claddings 41, and an inner rib ring 43 located inside the outer cladding 41, a plurality of evenly distributed limiting ropes 5 are fixedly connected between the inner rib ring 43 and the inner wall of the outer cladding 41, the inner unsaturated filling degree of the outer cladding 41 located inside is filled with lining liquid, the filling degree of the lining liquid is 70-85%, so that more folds of the outer cladding 41 are formed, when receiving the extrusion force of helping the closing cap 2, interior gentle supporting ring 4 can take place adaptability deformation in radial to difficult messenger's circle body 1 takes place deformation in radial, and the inside lining liquid keeps unanimous with the hydraulic oil that is suitable for the hydro-cylinder, makes its unexpected back of leaking, is difficult for causing the pollution to inside hydraulic oil.

The positive type broken ball 42 is a high-temperature-resistant brittle structure, when molten rubber is wrapped outside the ring body 1 in the preparation process, the ring body can better shape a hollow cavity inside the ring body 1, so that overlarge concave-convex parts are not easy to appear on the inner wall of an inner cavity, force can be applied to the section of the ring body 1 after forming, the positive type broken ball 42 is cracked, the inner flexible support ring 4 mainly supports the ring body 1 by lining liquid inside the ring body to present flexible support, the limiting rope 5 is made of a high-temperature-resistant elastic structure, the outer cladding 41 is in a folded state, the inner part of the inner outer cladding 41 is vacuumized after the lining liquid is filled into the inner cladding 41, the strength of the inner flexible support ring 4 is effectively ensured, the inner surface and the outer surface of the ring body 1 are better supported, LINE-X coating layers are respectively coated on the inner surface and the outer surface of the outer cladding 41, so that the strength of the outer cladding 41 is higher, the broken positive type broken ball 42 is not easy to crack, and the ring body 1 is effectively protected, so that the cracking is not easy to occur.

Referring to fig. 6-7, a plurality of reset airbags 7 are uniformly distributed in the self-reset connecting layer 3, and a plurality of inner complex light hemispheres 8 fixedly connected to the inner wall of the end cover, the plurality of inner complex light hemispheres 8 are respectively distributed at intervals with the plurality of reset airbags 7, a pressure sensor and a light sensor are further installed on the inner wall of the self-reset connecting layer 3 close to the end cover, both ends of the reset airbags 7 are fixedly connected with the inner wall of the self-reset connecting layer 3, when the ring body 1 is not aged and the dynamic seal position is well sealed, the moving distance of the sealing-aid cover 2 towards the ring body 1 is relatively stable, so that the stress data of the pressure sensor is stable, when the dynamic seal position has internal leakage, the oil pressure is reduced, and the data is obviously reduced, according to the data change, the staff can find in time at the initial stage of inner leakage, and further the influence on the quality and the precision of the produced product caused by the inner leakage is effectively avoided.

Referring to fig. 8, the inner double-light hemisphere 8 includes a supporting plate 81 fixed to the self-resetting connection layer 3 and a double-light layer 82 fixedly connected to an outer end of the supporting plate 81, the supporting plate 81 is made of a hard material, the double-light layer 82 is made of an elastic material, a light sensing end of the light sensor is lower than a force measuring end of the pressure sensor, so that the light sensor is not easily subjected to an extrusion force of the sealing aid cover 2 and is not easily damaged, and the force measuring end of the pressure sensor is higher than an edge of the supporting plate 81, so that the extrusion force generated by the force measuring end when the sealing aid cover 2 moves is effectively ensured.

In addition, the distance between the force measuring end of the pressure sensor and the sealing assisting cover 2 can be adjusted by a technician according to normal oil pressure during specific implementation, so that the sealing assisting cover 2 is extruded when moving.

In the longitudinal direction, the inner wall of the maximum span of the light-shielding layer 82 is fixedly connected with a fluorescent flexible ring 91, the light-shielding layer 82 is of a double-layer structure, the inner part of the double-layer light-shielding layer 82 is fixedly connected with a plurality of light-shielding row rings 92, the cross sections of the light-shielding row rings 92 completely cover the outer surface of the fluorescent flexible ring 91, two adjacent light-shielding row rings 92 are in mutual contact, the light-shielding layer 82 corresponding to the light-shielding row rings 92 is of a transparent structure, and the rest parts of the light-shielding layer 82 are of an opaque structure, so that the light-transmitting condition of the light-shielding layer 82 is not easy to occur under normal conditions, when the oil cylinder works, the inner light-shielding hemisphere 8 is extruded, the light-shielding layer 82 is stretched, at this time, the light-shielding row rings 92 are far away from each other, the gap between the light-shielding rings is increased, so that the light-transmitting condition occurs, and the data change occurs in the light sensor, when the oil pressure is reduced, the distance between the light-shielding row rings 92 is reduced, or is not far away from each other, at this time, the maximum value of the light sensor is reduced, and the data change of the pressure sensor is matched, so that the judgment accuracy of the internal leakage condition of the working personnel is higher.

In the moving process of the piston rod, the sealing assisting cover 2 on the moving side end cover moves towards the ring body 1 under the action of gradually increased oil pressure, so that the ring body 1 is extruded, as shown in fig. 5, the sealing assisting cover is radially deformed, the contact area with the inner wall of the oil cylinder is greatly increased, the sealing effect is improved, when the ring body 1 is aged, the toughness of the ring body 1 is weakened, the moving span of the sealing assisting cover 2 is increased, the pressed shape of the ring body 1 is greatly changed, the contact area with the inner wall is larger, the problem of poor sealing caused by aging is effectively solved, the leakage condition is effectively avoided, and meanwhile, the service life of the sealing assisting cover is effectively prolonged; in addition, when the interior state of leaking appearing, because the oil pressure reduces, lead to diminishing from the atress of reset even layer 3 department, interior compound light hemisphere 8 diminishes, lead to the diminishing condition that the data all obviously appears on the sensor to just carry out the early warning to the staff in the initial stage of leaking appearing, reduce the influence.

Example 2:

as shown in fig. 9: the edge cross-section that the circle body 1 is close to the hydro-cylinder inner wall is two evagination structures, and form the U-shaped between the two evaginations, the embedded benefit seal ring 6 that is equipped with of U-shaped, the outer surface of benefit seal ring 6 is less than the evagination surface, and the two surface all contacts with the hydro-cylinder inner wall, under the effect of evagination structure, the contact atress between benefit seal ring 6 and the hydro-cylinder inner wall is less relatively, make its ageing speed be slower than circle body 1, thereby make circle body 1 after ageing, it can continue to play sealed effect, realize the life of extension circle body 1 and the effect of sealed effect.

In this embodiment, because the setting of evagination structure, the sealing contact of circle body 1 and hydro-cylinder inner wall presents the bilayer, realizes double-deck sealed effect to after circle body 1 ages, along with the ageing degree deepening, circle body 1 deformation range further increases, makes the contact atress between benefit seal ring 6 and the hydro-cylinder bigger, thereby the sealing layer is strengthened to the formation one deck of compensation type after it ages, further prolongs the sealed effect of this sealing washer.

The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.

Claims

1. The utility model provides an external seal structure of hydraulic cylinder, establishes including the cover and helps closing cap (2) near the ring body (1) of the interior outer end of hydro-cylinder and the end cover tip clearance fit in the hydro-cylinder near the hydro-cylinder end cover, help closing cap (2) and ring body (1) the mutual contact, its characterized in that: the self-resetting connecting layer (3) is fixedly connected between the sealing-aid cover (2) and the end face of the oil cylinder end cover, the ring body (1) is of a hollow circular structure, an inner flexible supporting ring (4) is placed in a hollow inner cavity of the ring body (1), the inner flexible supporting ring (4) comprises two outer claddings (41), a positive broken ball (42) positioned between the two outer claddings (41) and an inner rib ring (43) positioned on the inner side of the outer claddings (41), a plurality of uniformly-distributed limiting ropes (5) are fixedly connected between the inner rib ring (43) and the inner wall of the outer claddings (41), and lining liquid is filled in the inner unsaturated outer claddings (41) positioned on the inner side;

a plurality of reset air bags (7) which are uniformly distributed and a plurality of inner complex light hemispheres (8) which are fixedly connected with the inner wall of the end cover are arranged in the self-reset connecting layer (3), the plurality of inner complex light hemispheres (8) are respectively distributed with the plurality of reset air bags (7) at intervals, a pressure sensor and a light sensor are further arranged on the inner wall of the self-reset connecting layer (3) close to the end cover, and two ends of each reset air bag (7) are fixedly connected with the inner wall of the self-reset connecting layer (3);

the inner light-recombination hemisphere (8) comprises a supporting plate (81) fixed with the self-resetting connecting layer (3) and a light-recombination layer (82) fixedly connected to the outer end of the supporting plate (81), the supporting plate (81) is made of a hard material, and the light-recombination layer (82) is made of an elastic material.

2. The outer sealing structure of a hydraulic cylinder according to claim 1, wherein: the outer cladding layer (41) is in a folded state, the inner side of the outer cladding layer (41) is vacuumized after lining liquid is filled in the inner cladding layer, and the inner surface and the outer surface of the outer cladding layer (41) are coated with LINE-X coating.

3. The outer sealing structure of a hydraulic cylinder according to claim 2, wherein: the filling degree of the lining liquid is 70-85%, and the lining liquid is consistent with hydraulic oil of an applicable oil cylinder.

4. The outer sealing structure of a hydraulic cylinder according to claim 2, wherein: the positive broken ball (42) is a high-temperature-resistant brittle structure, and the limiting rope (5) is made of a high-temperature-resistant elastic structure.

5. The outer sealing structure of a hydraulic cylinder according to claim 1, wherein: the light sensing end part of the light sensor is lower than the force measuring end of the pressure sensor, and the force measuring end of the pressure sensor is higher than the edge of the supporting plate (81).

6. The outer sealing structure of a hydraulic cylinder according to claim 1, wherein: in the longitudinal direction, the inner wall of the maximum span of the light coating layer (82) is fixedly connected with a fluorescent flexible ring (91), the light coating layer (82) is of a double-layer structure, a plurality of shading row rings (92) are fixedly connected inside the double-layer light coating layer (82), and the cross sections of the shading row rings (92) completely cover the outer surface of the fluorescent flexible ring (91).

7. The outer sealing structure of a hydraulic cylinder according to claim 6, wherein: two adjacent shading row rings (92) are mutually contacted, the position of the light-shading layer (82) corresponding to the shading row rings (92) is of a transparent structure, and the rest part of the light-shading layer (82) is of an opaque structure.

8. The outer sealing structure of a hydraulic cylinder according to claim 1, wherein: the edge section of the ring body (1) close to the inner wall of the oil cylinder is of a double-convex structure, a U shape is formed between the double convex structures, a sealing ring (6) is embedded in the U shape, the outer surface of the sealing ring (6) is lower than the outer convex surface, and the surfaces of the sealing ring and the outer convex surface are in contact with the inner wall of the oil cylinder.