阅读说明：本技术 一种伺服液压缸耐磨密封结构 (Wear-resisting seal structure of servo hydraulic cylinder ) 是由 郑文斌 于 2021-08-13 设计创作，主要内容包括：本发明属于液压缸技术领域,尤其是一种伺服液压缸耐磨密封结构,现提出以下方案,包括缸体和伸缩杆,伸缩杆的底端固定有与缸体内壁滑动连接的活塞件,所述活塞件的外壁套接固定有环状结构的第一橡胶套,所述活塞件内的底部设置有液压腔,且液压腔的底部与缸体底部连通,缸体内注入液体而挤压活塞件进行伸缩时,液体和气压会进入液压腔而挤压第一橡胶套内壁的底部。本发明通过第一橡胶套向外的倾斜挤压而提高实际活塞位置的密封效果,并且通过底部和顶部的倾斜转化,配合液压以及机械向外挤压第一橡胶套,从而提高活塞件长久使用的有效性和耐磨效果,以通过液压和机械挤压的配合大大提高液压缸的耐磨和密封效果。(The invention belongs to the technical field of hydraulic cylinders, and particularly relates to a wear-resistant sealing structure of a servo hydraulic cylinder. The invention improves the sealing effect of the actual piston position by the outward inclined extrusion of the first rubber sleeve, and the first rubber sleeve is extruded outward by matching hydraulic pressure and machinery through the inclined conversion of the bottom and the top, thereby improving the effectiveness and the wear-resisting effect of the piston piece in long-term use and greatly improving the wear-resisting and sealing effects of the hydraulic cylinder through the matching of the hydraulic pressure and the mechanical extrusion.)

1. The utility model provides a servo pneumatic cylinder wear-resisting seal structure, includes cylinder body (1) and telescopic link (2), the bottom mounting of telescopic link (2) have with cylinder body (1) inner wall sliding connection's piston spare (3), a serial communication port, the outer wall of piston spare (3) cup joints first rubber sleeve (4) that are fixed with annular structure, bottom in piston spare (3) is provided with hydraulic pressure chamber (6), and the bottom and cylinder body (1) bottom intercommunication in hydraulic pressure chamber (6), when pouring into liquid and extrude piston spare (3) and stretch out and draw back in cylinder body (1), liquid and atmospheric pressure can get into hydraulic pressure chamber (6) and extrude the bottom of first rubber sleeve (4) inner wall, top in piston spare (3) is provided with extrusion chamber (7), and the position that corresponds with first rubber sleeve (4) in extrusion chamber (7) is provided with mechanical buffer structure, piston spare (3) rise in-process extrusion mechanical buffer structure and outwards extrude the top of first rubber sleeve (4) inner wall .

2. The wear-resistant sealing structure of the servo hydraulic cylinder according to claim 1, characterized in that the piston member (3) is provided with a bottom plate (301) and a top plate (302), a partition plate (5) is fixed between the bottom plate (301) and the top plate (302), a hydraulic cavity (6) is formed between the bottom of the partition plate (5) and the top of the bottom plate (301), a plurality of through holes (8) are formed in the inner wall of the bottom of the hydraulic cavity (6), an extrusion cavity (7) is formed between the top of the partition plate (5) and the bottom of the top plate (302), a plurality of horizontally-arranged first extrusion mechanisms (9) are arranged in the extrusion cavity (7), vertically-arranged connection buffer mechanisms (10) are connected between the plurality of first extrusion mechanisms (9), and the first extrusion mechanisms (9) and the connection buffer mechanisms (10) form a mechanical buffer structure.

3. The wear-resistant sealing structure of the servo hydraulic cylinder as claimed in claim 2, the bottom of the clapboard (5) is fixed with fixing parts (501) distributed in an annular array, and the top of baffle (5) is fixed with installation department (502) that the annular array distributes, interval sets up in turn between fixed part (501) and the installation department (502), first rubber sleeve (4) circumference inner wall is located and is fixed with contact site (11) between two adjacent fixed part (501), the arc length of contact site (11) is greater than the arc length of installation department (502), first rubber sleeve (4) circumference inner wall is located and is fixed with extrusion portion (12) between two adjacent installation departments (502), the arc length of extrusion portion (12) is greater than the arc length of fixed part (501), extrusion portion (12) are corresponding with the position of first extrusion mechanism (9), contact site (11) and extrusion portion (12) are close to piston spare (3) one side at the center and all set up the arc structure of hunch-up.

4. The wear-resistant sealing structure of the servo hydraulic cylinder as claimed in claim 3, wherein the first extrusion mechanism (9) is provided with a fixing plate (13) fixed on the top and bottom inner walls of the extrusion chamber (7), a fixing hole is formed in the middle position of one side of the fixing plate (13), a horizontally placed fixing rod (14) is slidably connected to the circumferential inner wall of the fixing hole, a first extrusion piece (15) with an arc structure is fixed at one end of the fixing rod (14) close to the extrusion part (12), a first connecting piece (16) is fixed at one end of the fixing rod (14) far away from the extrusion part (12), a first spring (17) is connected between the first connecting piece (16) and the fixing plate (13), the outer wall of one side of the first connecting piece (16) far away from the fixing rod (14) is provided with an outwardly arched structure, and the top and bottom outer walls of the first connecting piece (16) are respectively slidably connected with the top and bottom inner walls of the extrusion chamber (7), the bottom end of the connecting buffer mechanism (10) is provided with a connecting block (29) corresponding to the connecting piece (16), and the connecting block (29) is arranged into a hemispherical structure which can move in the vertical direction in an arched manner.

5. The wear-resistant sealing structure of the servo hydraulic cylinder according to any one of claims 2 to 4, characterized in that a fixing member (18) is fixed at the bottom end of the telescopic rod (2), a second rubber sleeve (20) with an annular structure is sleeved on the outer wall of the fixing member (18), a connection buffer mechanism (10) is connected between the bottom of the fixing member (18) and the middle position of the top of the piston member (3), a connection cavity (19) is formed in the fixing member (18), a plurality of horizontally arranged second extrusion mechanisms (21) are arranged in the connection cavity (19), the second extrusion mechanisms (21) are matched with the connection buffer mechanism (10), and the second extrusion mechanisms (21) and the first extrusion mechanisms (9) are distributed at intervals on the circumferential surface.

6. The wear-resistant sealing structure of the servo hydraulic cylinder according to claim 5, wherein the fixing piece (18) is provided with a connecting plate (1801) located at the bottom and a positioning plate (1802) located at the top, the middle position of the top of the positioning plate (1802) is fixedly connected with the bottom end of the telescopic rod (2), the middle position of the connecting plate (1801) is provided with through holes (22) distributed in an annular array, positioning blocks (1803) distributed in an annular array are fixed between the connecting plate (1801) and the positioning plate (1802), an auxiliary portion (2001) is fixed at a position, located between two adjacent positioning blocks (1803), of the circumferential inner wall of the second rubber sleeve (20), and the inner side of the auxiliary portion (2001) is provided with an arched arc-shaped structure.

7. The wear-resistant sealing structure of the servo hydraulic cylinder according to claim 6, wherein the outer wall of one side of the positioning block (1803) close to the second rubber sleeve (20) is provided with connecting grooves which are equidistantly distributed in the vertical direction, two sides of each connecting groove penetrate through the connecting grooves, the inner walls of the connecting grooves are arranged into an inwardly arched arc-shaped structure, and the connecting portions (1804) are fixed on the circumferential inner wall of the second rubber sleeve (20) at positions corresponding to the connecting grooves.

8. The wear-resistant sealing structure of the servo hydraulic cylinder as claimed in claim 6, wherein the second extrusion mechanism (21) is provided with a mounting plate (23) fixed between the top and bottom inner walls of the connecting cavity (19), a mounting hole is formed in the middle position of one side of the mounting plate (23), a horizontally placed mounting rod (24) is connected to the inner wall of the mounting hole in a sliding manner, a second extrusion piece (25) with an arc structure is fixed to one end of the mounting rod (24) close to the auxiliary part (2001), a second connecting piece (26) with a hemispherical structure is fixed to one end of the mounting rod (24) far away from the auxiliary part (2001), a second spring (27) is connected between the second connecting piece (26) and the mounting plate (23), the second connecting piece (26) is arched to one side far away from the mounting rod (24), and a connecting block (29) matched with the second connecting piece (26) is arranged at the top end of the connecting and buffering mechanism (10), the connecting block (29) is arranged into an upward arched hemispherical structure.

9. The wear-resistant sealing structure of the servo hydraulic cylinder according to claim 5, characterized in that sliding holes are formed in the middle position of the outer wall of the top of the piston member (3) and the middle position of the outer wall of the bottom of the fixing member (18), a sliding groove is formed in one end of each sliding hole, the connecting and buffering mechanism (10) is provided with a connecting rod (28) which is slidably connected between the two sliding holes, connecting blocks (29) which are slidably connected with the inner wall of the sliding groove are fixed to the top end and the bottom end of each connecting rod (28), each connecting block (29) is of a hemispherical structure, each connecting block (29) is arranged in a mode of being arched towards the end far away from the corresponding connecting rod (28), and a buffering spring (30) is connected between the top of the piston member (3) and the fixing member (18) and corresponds to the corresponding connecting rod (28).

Technical Field

The invention relates to the technical field of hydraulic cylinders, in particular to a wear-resistant sealing structure of a servo hydraulic cylinder.

Background

The hydraulic cylinder is a hydraulic actuating element which converts hydraulic energy into mechanical energy and makes linear reciprocating motion (or swinging motion), and the hydraulic cylinder generally used at present mainly comprises a cylinder body and a rod body, wherein one end of the rod body slides in the cylinder body through a piston, and the piston is extruded to realize the extension and retraction of the rod body through the flowing and changing of liquid in the cylinder body.

The in-process that uses the pneumatic cylinder among the prior art often can make the body of rod and the long-time reciprocating operation of piston, and the wearing and tearing to the piston are big and lead to the sealed effect of piston position to reduce, and only focus on the sealed protection effect to cylinder body opening position among the prior art, also only consider to use wear-resisting material to be used for the piston to the piston position, and does not have protection architecture and the mode to the wear-resisting sealed effect of piston position.

Disclosure of Invention

Based on the technical problem of the background art, the invention provides a wear-resistant sealing structure of a servo hydraulic cylinder.

The invention provides a wear-resistant sealing structure of a servo hydraulic cylinder, which comprises a cylinder body and a telescopic rod, wherein a piston piece connected with the inner wall of the cylinder body in a sliding manner is fixed at the bottom end of the telescopic rod, a first rubber sleeve with an annular structure is sleeved and fixed on the outer wall of the piston piece, a hydraulic cavity is arranged at the bottom in the piston piece, the bottom of the hydraulic cavity is communicated with the bottom of the cylinder body, when liquid is injected into the cylinder body and the piston piece is extruded to stretch, the liquid and air pressure can enter the hydraulic cavity to extrude the bottom of the inner wall of the first rubber sleeve, an extrusion cavity is arranged at the top in the piston piece, a mechanical buffer structure is arranged at a position in the extrusion cavity, which corresponds to the first rubber sleeve, and the mechanical buffer structure is extruded to extrude the top of the inner wall of the first rubber sleeve outwards in the ascending process of the piston piece.

Preferably, the piston piece is provided with bottom plate and roof, and is fixed with the baffle between bottom plate and the roof, constitutes between the bottom of baffle and the top of bottom plate has the hydraulic pressure chamber, and a plurality of through-holes have been seted up to the bottom inner wall in hydraulic pressure chamber, constitutes between the top of baffle and the bottom of roof has the extrusion chamber, is provided with the first extrusion mechanism that a plurality of levels were placed in the extrusion chamber, is connected with the connection buffer gear of vertical placing between a plurality of first extrusion mechanisms, and first extrusion mechanism constitutes mechanical buffer structure with connecting buffer gear.

Preferably, the bottom of baffle is fixed with the fixed part that annular array distributes, and the top of baffle is fixed with the installation department that annular array distributes, interval sets up in turn between fixed part and the installation department, first rubber sleeve circumference inner wall is located and is fixed with the contact site between two adjacent fixed parts, the arc length of contact site is greater than the arc length of installation department, first rubber sleeve circumference inner wall is located and is fixed with the extrusion portion between two adjacent installation departments, the arc length of extrusion portion is greater than the arc length of fixed part, extrusion portion is corresponding with the position of first extrusion mechanism, one side that contact site and extrusion portion are close to the piston piece center all sets up the arc structure of hunch-up.

Preferably, first extrusion mechanism is provided with the fixed plate that is fixed in extrusion chamber top and bottom inner wall, and one side intermediate position of fixed plate has seted up the fixed orifices, the circumference inner wall sliding connection of fixed orifices has the dead lever that the level was placed, the one end that the dead lever is close to extrusion portion is fixed with the first extruded article of arc structure, the one end that extrusion portion was kept away from to the dead lever is fixed with first connecting piece, be connected with first spring between first connecting piece and the fixed plate, one side outer wall that the dead lever was kept away from to first connecting piece sets up the arc structure of outside hunch-up, the top and the bottom outer wall of first connecting piece respectively with the top and the bottom inner wall sliding connection in extrusion chamber, the bottom of connecting buffer gear is provided with the connecting block that corresponds with the connecting piece, the connecting block sets up the mobilizable hemispherical structure of decurrent hunch-up in vertical direction.

Preferably, the bottom mounting of telescopic link, and the outer wall of mounting cup joints the second rubber sleeve of loop configuration, is connected with between the intermediate position at mounting bottom and piston spare top and connects buffer gear, and the connection chamber has been seted up to the inside of mounting, connects the intracavity and is provided with the second extrusion mechanism that a plurality of levels were placed, second extrusion mechanism with connect buffer gear looks adaptation, set interval distribution to between second extrusion mechanism and the first extrusion mechanism on the periphery.

Preferably, the mounting is provided with the connecting plate that is located the bottom and the locating plate that is located the top, and the intermediate position at locating plate top and the bottom fixed connection of telescopic link, and the perforation that annular array distributes is seted up to the intermediate position of connecting plate, is fixed with the locating piece that annular array distributes between connecting plate and the locating plate, and the position that second rubber sleeve circumference inner wall is located between two adjacent locating pieces is fixed with the auxiliary part, and the inboard of auxiliary part sets up the arc structure of hunch-up.

Preferably, the locating piece is close to the spread groove that vertical direction equidistance distributes is seted up to one side outer wall of second rubber sleeve, and the both sides of spread groove pierce through the setting, and the inner wall of spread groove sets to the arc structure of inside hunch-up, and the position that second rubber sleeve circumference inner wall and spread groove correspond is fixed with connecting portion.

Preferably, second extrusion mechanism is provided with and is fixed in the mounting panel between connecting chamber top and the bottom inner wall, and the mounting hole has been seted up to the intermediate position of mounting panel one side, the inner wall sliding connection of mounting hole has the installation pole that the level was placed, the one end that the installation pole is close to the assistance portion is fixed with the second extruded article of arc structure, the one end that the assistance portion was kept away from to the installation pole is fixed with hemispherical structure's second connecting piece, be connected with the second spring between second connecting piece and the mounting panel, the second connecting piece is to the one side hunch-up of keeping away from the installation pole, the top of connecting buffer gear is provided with the connecting block with second connecting piece looks adaptation, the connecting block sets up the hemispherical structure of upwards hunch-up.

Preferably, the slide opening has all been seted up to the intermediate position of piston spare top outer wall and the intermediate position of mounting bottom outer wall, and the spout has been seted up to the one end of slide opening, it is provided with sliding connection's connecting rod between two slide openings to connect buffer gear, the top and the bottom of connecting rod all are fixed with the connecting block with spout inner wall sliding connection, the connecting block sets to hemispherical structure, the connecting block arches the setting to the one end of keeping away from the connecting rod, the position that corresponds with the connecting rod between piston spare top and the mounting is connected with buffer spring.

The beneficial effects of the invention are as follows:

1. in the embodiment of the invention, the first rubber sleeve is arranged in the process of moving along with the extension of the telescopic rod, the bottom position of the first rubber sleeve is extruded outwards because the hydraulic cavity is firstly inclined, the mechanical buffer structure at the top is extruded in the lifting process, the top position of the first rubber sleeve is obliquely extruded, when the bottom of the first rubber sleeve is normal, the extrusion force degree of the mechanical buffer structure at the top is small, namely, the bottom of the first rubber sleeve is only inclined for sealing, and the top of the first rubber sleeve is gradually inclined and extruded after the bottom of the first rubber sleeve is gradually worn, thereby improving the sealing effect of the actual piston position through the outward inclined extrusion of the first rubber sleeve, and the first rubber sleeve is extruded outwards by the inclination conversion of the bottom and the top in cooperation with hydraulic pressure and machinery, thereby improving the effectiveness and the wear-resisting effect of the piston piece in long-term use and greatly improving the wear-resisting and sealing effects of the hydraulic cylinder through the cooperation of hydraulic pressure and mechanical extrusion.

2. In the embodiment of the invention, the extrusion force generated by the vertically-arranged connecting buffer mechanism is transmitted to the horizontally-arranged first extrusion mechanism, so that the rubber material is prevented from being excessively damaged by buffering through the force steering while the alternating oblique extrusion sealing operation effect is ensured, the contact part and the extrusion part which are of arc structures and protrude inwards are utilized, when the first rubber sleeve is hydraulically and mechanically extruded, the first rubber sleeve is locally diffused to each position of the circumferential surface to improve the actual sealing effect, and the sealing effect in the oblique conversion process is improved and the wear-resisting use effect of the rubber sleeve is improved when the rubber sleeve is used for a long time through the alternating interval arrangement of the contact part and the extrusion part.

3. In the embodiment of the invention, the fixed plug and the movable plug are formed by the fixed piece and the piston piece, so that the buffer effect of the connecting buffer mechanism is realized, the mechanical extrusion effect on the top of the first rubber sleeve is realized by using the connecting buffer mechanism, the extrusion sealing effect on the second rubber sleeve is realized, the actual sealing property is improved by arranging the second extrusion mechanism and the first extrusion mechanism at intervals, the protection effect of auxiliary sealing is realized by using the second rubber sleeve after the first rubber sleeve is worn, and the wear resistance, the sealing property and the use effectiveness of the hydraulic cylinder in long-term use are further enhanced.

Drawings

Fig. 1 is a schematic overall structure diagram of a wear-resistant sealing structure of a servo hydraulic cylinder according to the present invention;

FIG. 2 is a schematic cross-sectional structural view of a wear-resistant sealing structure of a servo hydraulic cylinder according to the present invention;

FIG. 3 is a schematic perspective view of a piston member of a wear-resistant sealing structure of a servo hydraulic cylinder according to the present invention;

FIG. 4 is a schematic cross-sectional structural view of a piston member of the wear-resistant sealing structure of the servo hydraulic cylinder according to the present invention;

FIG. 5 is a schematic perspective view of a fixing member of a wear-resistant sealing structure of a servo hydraulic cylinder according to the present invention;

fig. 6 is a schematic cross-sectional structural diagram of a fixing member of a wear-resistant sealing structure of a servo hydraulic cylinder according to the present invention.

In the figure: 1 cylinder body, 2 telescopic rods, 3 piston pieces, 301 bottom plates, 302 top plates, 4 first rubber sleeves, 5 partition plates, 501 fixing parts, 502 mounting parts, 6 hydraulic cavities, 7 extrusion cavities, 8 through holes, 9 first extrusion mechanisms, 10 connection buffer mechanisms, 11 contact parts, 12 extrusion parts, 13 fixing plates, 14 fixing rods, 15 first extrusion parts, 16 first connecting pieces, 17 first springs, 18 fixing pieces, 1801 connecting plates, 1802 positioning plates, 1803 positioning blocks, 1804 connecting parts, 19 connecting cavities, 20 second rubber sleeves, 2001 auxiliary parts, 21 second extrusion mechanisms, 22 through holes, 23 mounting plates, 24 mounting rods, 25 second extrusion parts, 26 second connecting pieces, 27 second springs, 28 connecting rods, 29 connecting blocks and 30 connecting springs.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Example 1

Referring to fig. 1-4, a servo hydraulic cylinder wear-resistant sealing structure comprises a cylinder body 1 and an expansion link 2, a piston member 3 slidably connected with the inner wall of the cylinder body 1 is fixed at the bottom end of the expansion link 2, a first rubber sleeve 4 with an annular structure is sleeved and fixed on the outer wall of the piston member 3, a hydraulic chamber 6 is arranged at the bottom in the piston member 3, the bottom of the hydraulic chamber 6 is communicated with the bottom of the cylinder body 1, when liquid is injected into the cylinder body 1 to extrude the piston member 3 to expand, the liquid and air pressure can enter the hydraulic chamber 6 to extrude the bottom of the inner wall of the first rubber sleeve 4, an extrusion chamber 7 is arranged at the top in the piston member 3, a mechanical buffer structure is arranged at a position in the extrusion chamber 7 corresponding to the first rubber sleeve 4, the piston member 3 extrudes the mechanical buffer structure to extrude the top of the inner wall of the first rubber sleeve 4 outwards in the ascending process of the expansion link 2, the first rubber sleeve 4 moves along with the expansion link 2, its bottom position is because the outside extrusion of the earlier one step slope of hydraulic pressure chamber 6, and the mechanical buffer structure who extrudees the top at the in-process that rises makes the top position slope extrusion of first rubber sleeve 4 again, when first rubber sleeve 4 bottom is normal, the extrusion force degree that top mechanical buffer structure received is little, only rely on the bottom slope of first rubber sleeve 4 to seal promptly, and its top slope extrusion gradually after the wearing and tearing gradually in first rubber sleeve 4 bottom, thereby extrude and improve the sealed effect of actual piston position through the outside slope of first rubber sleeve 4, and through the slope conversion of bottom and top, cooperate hydraulic pressure and the first rubber sleeve 4 of mechanical outside extrusion, thereby improve validity and the wear-resisting effect of 3 permanent uses of piston spare, wear-resisting and the sealed effect of pneumatic cylinder are greatly improved through the cooperation of hydraulic pressure and mechanical extrusion.

In the invention, the piston piece 3 is provided with a bottom plate 301 and a top plate 302, a partition plate 5 is fixed between the bottom plate 301 and the top plate 302, a hydraulic cavity 6 is formed between the bottom of the partition plate 5 and the top of the bottom plate 301, the inner wall of the bottom of the hydraulic cavity 6 is provided with a plurality of through holes 8, a squeezing cavity 7 is formed between the top of the partition plate 5 and the bottom of the top plate 302, a plurality of horizontally arranged first squeezing mechanisms 9 are arranged in the squeezing cavity 7, a vertically arranged connecting buffer mechanism 10 is connected between the plurality of first squeezing mechanisms 9, the first squeezing mechanisms 9 and the connecting buffer mechanisms 10 form a mechanical buffer structure, the partition plate 5 separates the hydraulic cavity 6 from the squeezing cavity 7 to avoid hydraulic pressure from influencing mechanical squeezing, and squeezing force generated by the vertically arranged connecting buffer mechanism 10 is transmitted to the horizontally arranged first squeezing mechanism 9, so as to ensure the alternately inclined squeezing and sealing operation effect, buffering is carried out through the turning of force, so that excessive damage to rubber materials is avoided.

In the invention, the bottom of the clapboard 5 is fixed with fixing parts 501 distributed in a ring array, the top of the clapboard 5 is fixed with mounting parts 502 distributed in a ring array, the fixing parts 501 and the mounting parts 502 are alternately arranged at intervals, the inner circumferential wall of the first rubber sleeve 4 is positioned between two adjacent fixing parts 501 and is fixed with a contact part 11, the arc length of the contact part 11 is larger than the arc length of the mounting part 502, the inner circumferential wall of the first rubber sleeve 4 is positioned between two adjacent mounting parts 502 and is fixed with a pressing part 12, the arc length of the pressing part 12 is larger than the arc length of the fixing parts 501, the position of the pressing part 12 corresponds to that of the first pressing mechanism 9, one sides of the contact part 11 and the pressing part 12 close to the center of the piston member 3 are both arranged into an arched arc structure, therefore, in the actual use process, when the first rubber sleeve 4 is pressed by hydraulic pressure and mechanical pressure by utilizing the contact part 11 and the pressing part 12 which are in the arc structure and protrude inwards, the sealing effect is improved by locally spreading to each position of the circumferential surface, and the sealing effect in the inclined conversion process is improved and the wear-resisting use effect of the rubber sleeve is improved when the rubber sleeve is used for a long time by the alternative arrangement of the contact part 11 and the extrusion part 12.

In the invention, a first extrusion mechanism 9 is provided with a fixed plate 13 fixed on the top and bottom inner walls of an extrusion cavity 7, a fixed hole is arranged at the middle position of one side of the fixed plate 13, a horizontally arranged fixed rod 14 is connected on the circumferential inner wall of the fixed hole in a sliding manner, a first extrusion piece 15 with an arc-shaped structure is fixed at one end of the fixed rod 14 close to an extrusion part 12, a first connecting piece 16 is fixed at one end of the fixed rod 14 far away from the extrusion part 12, a first spring 17 is connected between the first connecting piece 16 and the fixed plate 13, the outer wall of one side of the first connecting piece 16 far away from the fixed rod 14 is provided with the arc-shaped structure which is arched outwards, the top and bottom outer walls of the first connecting piece 16 are respectively connected with the top and bottom inner walls of the extrusion cavity 7 in a sliding manner, a connecting block 29 corresponding to the connecting piece 16 is arranged at the bottom end of a connecting buffer mechanism 10, and the connecting block 29 is provided with a hemispherical structure which is arched downwards and can move in the vertical direction, in-process of in-service use, utilize the first extruded part 15 of arc structure to cooperate the extrusion portion 12 of arc structure and make the sealed distribution of extrusion to first rubber sleeve 4 even, and make the extrusion of the position that first rubber sleeve 4 and extrusion portion 12 correspond to the intermediate position of outside side, thereby improve the sealed effect of reality and the validity of using for a long time, utilize hemispherical structure's connecting block 29 and the cambered surface looks adaptation of first connecting piece 16, and improve the actual buffering effect to flexible operation, avoid mechanical collision to cause the damage, and utilize the buffering to strengthen buffering effect with vertical power dispersion to a plurality of horizontal force, and further improve the sealed effect of actual use.

Example 2

Embodiment 2 includes all the structures and methods of embodiment 1, referring to fig. 1 to 6, a wear-resistant sealing structure of a servo hydraulic cylinder further includes a fixing member 18 fixed at the bottom end of a telescopic rod 2, a second rubber sleeve 20 of a ring structure is sleeved on the outer wall of the fixing member 18, a connection buffer mechanism 10 is connected between the bottom of the fixing member 18 and the middle position of the top of a piston member 3, a connection cavity 19 is opened inside the fixing member 18, a plurality of second extrusion mechanisms 21 horizontally disposed are disposed in the connection cavity 19, the second extrusion mechanisms 21 are adapted to the connection buffer mechanism 10, the second extrusion mechanisms 21 and the first extrusion mechanisms 9 are disposed at intervals on the circumferential surface, so that the fixing member 18 and the piston member 3 form a fixed plug and a movable plug, so as to achieve the buffer effect of the connection buffer mechanism 10 and the mechanical extrusion effect of the top of the first rubber sleeve 4 by using the connection buffer mechanism 10, and realize the sealed effect of extrusion to second rubber sleeve 20, and set up the leakproofness that improves reality through the interval of second extrusion mechanism 21 and first extrusion mechanism 9 to and utilize second rubber sleeve 20 to carry out supplementary sealed protection effect after first rubber sleeve 4 wearing and tearing, further strengthen wearing resistance, leakproofness and the validity of use that the pneumatic cylinder used for a long time.

In the invention, a fixing piece 18 is provided with a connecting plate 1801 positioned at the bottom and a positioning plate 1802 positioned at the top, the middle position of the top of the positioning plate 1802 is fixedly connected with the bottom end of an expansion rod 2, the middle position of the connecting plate 1801 is provided with through holes 22 distributed in an annular array, positioning blocks 1803 distributed in an annular array are fixed between the connecting plate 1801 and the positioning plate 1802, an auxiliary part 2001 is fixed on the inner circumferential wall of a second rubber sleeve 20 positioned between two adjacent positioning blocks 1803, and the inner side of the auxiliary part 2001 is provided with an arched arc structure;

the locating piece 1803 is close to the one side outer wall of second rubber sleeve 20 and has seted up the spread groove that vertical direction equidistance distributes, and the both sides of spread groove pierce through the setting, the inner wall of spread groove sets up the arc structure of inside hunch-up, the position that second rubber sleeve 20 circumference inner wall and spread groove correspond is fixed with connecting portion 1804, actually in the use, when second extrusion mechanism 21 outwards extrudes auxiliary portion 2001 and second rubber sleeve 20, part rubber portion extends to the position of connecting portion 1804 to both sides, thereby realize even distributed extrusion sealed, further strengthen the sealed and permanent wear-resisting effect of second rubber sleeve 20 position, in order to strengthen the holistic validity of using for a long time of pneumatic cylinder.

In the invention, the second extrusion mechanism 21 is provided with a mounting plate 23 fixed between the top and bottom inner walls of the connecting cavity 19, a mounting hole is arranged at the middle position of one side of the mounting plate 23, the inner wall of the mounting hole is connected with a horizontally placed mounting rod 24 in a sliding way, one end of the mounting rod 24 close to the auxiliary part 2001 is fixed with a second extrusion piece 25 with an arc structure, one end of the mounting rod 24 far away from the auxiliary part 2001 is fixed with a second connecting piece 26 with a hemispherical structure, a second spring 27 is connected between the second connecting piece 26 and the mounting plate 23, the second connecting piece 26 is arched to one side far away from the mounting rod 24, the top end of the connecting and buffering mechanism 10 is provided with a connecting piece 29 matched with the second connecting piece 26, the connecting piece 29 is arranged into an upwards arched hemispherical structure, when in actual use, the second extrusion piece 25 with the arc structure is matched with the auxiliary part 2001 to ensure that the mechanical extrusion sealing of the second rubber sleeve 20 is uniformly dispersed, the actual sealing effect is improved.

In the invention, the middle position of the outer wall at the top of the piston piece 3 and the middle position of the outer wall at the bottom of the fixing piece 18 are both provided with sliding holes, one end of each sliding hole is provided with a sliding groove, the connecting and buffering mechanism 10 is provided with a connecting rod 28 which is connected between the two sliding holes in a sliding manner, the top end and the bottom end of the connecting rod 28 are both fixed with connecting blocks 29 which are connected with the inner wall of the sliding groove in a sliding manner, the connecting blocks 29 are arranged in a hemispherical structure, the connecting blocks 29 are arranged in an arched manner towards one end far away from the connecting rod 28, and the position between the top of the piston piece 3 and the fixing piece 18 corresponding to the connecting rod 28 is connected with a buffering spring 30.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.