CN220301073U - Self-adjusting piston - Google Patents

Abstract

The utility model discloses a self-adjusting piston, which belongs to the technical field of piston support, and particularly relates to a self-adjusting piston, comprising a piston column arranged in a piston cavity and a support plate connected to the piston column, wherein a spherical groove is formed in the end part of the piston column, which is far away from the piston cavity, a spherical connecting piece consistent with the spherical radian of the spherical groove is movably arranged in the spherical groove, the spherical connecting piece is connected with the support plate, and the top surface of the support plate is used for stably supporting a piece to be supported. According to the self-adjusting piston, the spherical groove and the spherical connecting piece are used for connection between the supporting plate and the piston column, so that the relative bending angle between the spherical groove and the spherical connecting piece can be automatically adjusted when the to-be-supported piece deflects, the matched abrasion between the piston column and the piston cavity is avoided, and the service life of the self-adjusting piston can be prolonged.

Description

Self-adjusting piston

Technical Field

The utility model relates to the technical field of piston support, in particular to a self-adjusting piston.

Background

The calender is a key device for determining the quality index of paper in a papermaking production line, and can meet the requirements of calendering finishing of different paper types by configuring a hot roller and a soft calender with a controllable middle-high roller. The controllable middle-high roller is an important part in the soft calender, the hot roller and the controllable middle-high roller are extruded relatively, and as the surface of the controllable middle-high roller is coated with the composite material, the surface of the controllable middle-high roller is deformed under the extrusion of the hot roller, so that the radius of an extrusion part is reduced, the linear speed of a deformation area is reduced, and the extrusion part of the controllable middle-high roller and the extrusion part of the hot roller can slide relatively, so that the paper is calendered.

The structure of the controllable middle-high roller mainly comprises an internal mandrel and a cylinder body which is rotationally sleeved outside the mandrel, wherein the cylinder body is coated with a composite material, and the cylinder body is rotationally connected with the mandrel. Because the length of the controllable middle-high roller is longer, the middle part is easy to bend, so that the calendaring effect between the two ends and the middle part is different, and the quality of paper is affected.

For static pressure supporting, in the prior art, a static pressure supporting piston is generally adopted, the height of the supporting is controlled by hydraulic oil to adjust the bending condition of a cylinder, for example, chinese patent with the authority of publication No. CN105648828B discloses a controllable middle-high roller, namely, the structure is adopted, the deformation of the cylinder is adjusted by distributing a plurality of static pressure supporting pistons on a mandrel along the axial direction, the static pressure supporting pistons are arranged in a mounting hole of the mandrel, and due to the deformation of the mandrel, the vertical relationship between the static pressure supporting pistons which are originally arranged perpendicular to the mandrel and the mandrel can be changed, so friction and abrasion can be generated between the static pressure supporting pistons and the mounting hole of the mandrel, even the deformation can cause the reduction of the sealing performance of the static pressure supporting pistons after long-term use, and the use effect of the static pressure supporting pistons is reduced.

In the prior art, less technical schemes related to improvement of controllable middle and high rollers are disclosed in Chinese patent application publication No. CN105544279A, and a super calender is also disclosed in the scheme, but similar to the patent with the publication No. CN105648828B, the technical scheme that a static pressure support piston is arranged in a mounting hole of a mandrel is also disclosed, and the technical problems of friction, abrasion and deformation between the static pressure support piston and the mounting hole of the mandrel still exist.

Therefore, how to solve the matching problem of the static pressure support piston and the mounting hole caused by the deformation of the mandrel and improve the service life of the controllable middle-high roller is a technical problem which is actually existed in the field and needs to be solved.

Disclosure of Invention

The utility model aims to provide a self-adjusting piston, which solves the problems in the prior art, and can automatically adjust the relative bending angle between a spherical groove and a spherical connecting piece when a piece to be supported deflects by connecting the spherical groove and the spherical connecting piece between a supporting plate and a piston column, so that the matched abrasion between the piston column and a piston cavity is avoided, and the service life of the self-adjusting piston can be prolonged.

In order to achieve the above object, the present utility model provides the following solutions:

the utility model provides a self-adjusting piston, which comprises a piston column arranged in a piston cavity and a supporting plate connected to the piston column, wherein a spherical groove is formed in the end part, far away from the piston cavity, of the piston column, a spherical connecting piece with the spherical radian identical to that of the spherical groove is movably arranged in the spherical groove, the spherical connecting piece is connected with the supporting plate, and the top surface of the supporting plate is used for stably supporting a piece to be supported.

Preferably, the spherical connecting piece is of a hemispherical structure, and the spherical groove is of a less hemispherical structure.

Preferably, an annular groove is formed in the inner wall of the piston cavity, and a sealing ring is arranged in the annular groove, and the inner diameter side of the sealing ring is in sealing contact with the piston column.

Preferably, an oil inlet and outlet hole is formed in the bottom of the piston cavity.

Preferably, a capillary channel which is communicated with the piston cavity and the spherical groove is arranged on the piston column.

Preferably, the top surface of the support plate is planar.

Preferably, the piston cavity is arranged on the mandrel, the top surface of the supporting plate is an arc surface, the arc of the arc surface is matched with the arc of the inner circular surface of the cylinder body, a first oil hole communicated with the piston cavity is arranged on the piston column, a second oil hole communicated with the first oil hole is arranged on the spherical connecting piece, a third oil hole communicated with the second oil hole is arranged on the supporting plate, the third oil hole is communicated with a gap between the arc surface and the inner circular surface of the cylinder body, and a static pressure supporting oil film is formed in the gap.

Preferably, the aperture of the second oil hole is larger than that of the first oil hole, and the inlet of the second oil hole always covers the outlet of the first oil hole in the moving range of the spherical connecting piece.

Preferably, four static pressure grooves distributed in a matrix form are formed in the supporting plate, and the static pressure grooves are communicated with the third oil hole.

Compared with the prior art, the utility model has the following technical effects:

(1) According to the self-adjusting piston, the spherical groove and the spherical connecting piece are used for connection between the supporting plate and the piston column, so that the relative bending angle between the spherical groove and the spherical connecting piece can be automatically adjusted when the to-be-supported piece deflects, the matched abrasion between the piston column and the piston cavity is avoided, and the service life of the self-adjusting piston can be prolonged;

(2) The aperture of the second oil hole formed in the spherical connecting piece is larger than that of the first oil hole formed in the piston column, so that the inlet of the second oil hole always covers the outlet of the first oil hole in the movable range of the spherical connecting piece, and the situation that the first oil hole is blocked by the spherical connecting piece to cause unsmooth oil supply and ensure the stability of oil supply pressure when the mandrel is bent can be avoided.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic cross-sectional view of a self-adjusting piston of the present utility model;

FIG. 2 is a schematic view of another form of self-adjusting piston of the present utility model;

FIG. 3 is a top view of the support plate of the present utility model;

FIG. 4 is a schematic illustration of the application of the self-adjusting piston of the present utility model;

FIG. 5 is a schematic cross-sectional view of a mandrel according to the present utility model;

wherein, 1, the mandrel; 11. an oil inlet hole; 12. an oil drain hole; 13. a process tank; 2. a cylinder; 3. a self-adjusting piston; 31. a piston column; 311. a spherical groove; 312. a first oil hole; 313. a capillary channel; 32. a support plate; 321. a spherical connector; 3211. a second oil hole; 322. a static pressure tank; 323. a third oil hole; 33. a seal ring; 34. a piston chamber; 341. an oil inlet and outlet hole; 4. and (3) a bearing.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model aims to provide a self-adjusting piston, which solves the problems in the prior art, and can automatically adjust the relative bending angle between a spherical groove and a spherical connecting piece when a piece to be supported deflects by connecting the spherical groove and the spherical connecting piece between a supporting plate and a piston column, so that the matched abrasion between the piston column and a piston cavity is avoided, and the service life of the self-adjusting piston can be prolonged.

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.

As shown in fig. 1, the present utility model provides a self-adjusting piston 3 comprising a piston rod 31 mounted in a piston chamber 34 and a support plate 32 connected to the piston rod 31, the piston rod 31 being slidable in the piston chamber 34, and expansion and contraction of the piston rod 31 being achieved by injecting or removing hydraulic oil into or from the piston rod 31. The end of the piston column 31 far away from the piston cavity 34 is provided with a spherical groove 311, a spherical connecting piece 321 consistent with the spherical radian of the spherical groove 311 is movably arranged in the spherical groove 311, the spherical connecting piece 321 is connected with a supporting plate 32, and the top surface of the supporting plate 32 is used for stably supporting a piece to be supported. When the to-be-supported piece deflects, the relative bending angle between the spherical groove 311 and the spherical connecting piece 321 can be automatically adjusted, so that the matched abrasion between the piston column 31 and the piston cavity 34 is avoided, and the service life of the self-adjusting piston 3 can be prolonged.

The self-adjusting piston 3 of the present utility model can be applied to a shoe press or the like.

As shown in fig. 1, the spherical connecting member 321 may be a hemispherical structure, the spherical recess 311 may be a less hemispherical structure, and the more hemispherical structure may freely slide in the less hemispherical structure, so as to ensure a sufficient moving range of the support plate 32, so as to adapt to different bending degrees of the mandrel 1.

As shown in fig. 1, an annular groove is provided in the inner wall of the piston chamber 34, and a seal ring 33 is provided in the annular groove, and the inner diameter side of the seal ring 33 is in sealing contact with the piston rod 31. By providing the sealing ring 33, leakage of hydraulic oil can be avoided, ensuring that the piston column 31 obtains sufficient pressure and maintains sufficient accuracy and stability.

As shown in fig. 1, the bottom of the piston cavity 34 is provided with an oil inlet and outlet hole 341, and the oil inlet and outlet hole 341 may be provided singly, that is, the oil inlet and outlet hole 341 may be used for oil inlet and oil outlet, when oil is fed, the pressure in the piston cavity 34 rises to push the piston column 31 to eject, and when oil is discharged, the pressure in the piston cavity 34 falls, and the piston column 31 retracts.

As shown in fig. 1, the piston column 31 is provided with a capillary channel 313 for communicating the piston cavity 34 and the spherical groove 311, and by setting the capillary channel 313, oil in the piston cavity 34 can be supplemented to the spherical groove 311 to lubricate relative sliding between the spherical connecting piece 321 and the spherical groove 311, thereby reducing friction loss and prolonging service life.

As shown in fig. 1, the top surface of the support plate 32 may be a plane surface that contacts the support member to be supported, which also has a plane surface, to achieve stable support of the support member to be supported.

As shown in fig. 2 to 5, the present utility model provides another form of self-adjusting piston 3, which includes a piston column 31 radially mounted on a mandrel 1 and a support plate 32 connected to the piston column 31, wherein a piston cavity 34 is provided on the mandrel 1, the piston column 31 is slidably disposed in the piston cavity 34, the extending height of the piston column 31 can be adjusted by injecting hydraulic oil into the piston cavity 34, the piston column 31 is fixedly connected with the support plate 32, and the movement of the piston column 31 can drive the support plate 32 to change the position so as to realize the support function of the cylinder 2. The end of the piston column 31 far away from the mandrel 1 is provided with a spherical groove 311, the spherical groove 311 can be a few hemispheres, a hemisphere or a multi-hemisphere, when the spherical groove 311 adopts a multi-hemisphere structure, the spherical groove can be in a split manufacturing and assembling mode, and the spherical connector 321 can be limited by adopting the structure and is restrained in a spherical movable range. The spherical connecting piece 321 which is consistent with the radian of the spherical surface is movably arranged in the spherical groove 311, and the spherical connecting piece 321 can be attached to the contacted spherical surface in the spherical groove 311 to perform multi-degree-of-freedom movement. The spherical surface connecting piece 321 is connected with the backup pad 32, and the top surface radian of backup pad 32 matches with the interior round surface radian of barrel 2, can support barrel 2 and carry out the shape to barrel 2 through backup pad 32 to the bending condition of adjustment barrel 2. The piston column 31 is provided with a first oil hole 312 communicated with the piston cavity 34, the spherical connecting piece 321 is provided with a second oil hole 3211 communicated with the first oil hole 312, the supporting plate 32 is provided with a third oil hole 323 communicated with the second oil hole 3211, the third oil hole 323 is communicated with a gap between the top surface of the supporting plate 32 and the inner circular surface of the cylinder body 2, and hydraulic oil in the piston cavity 34 enters the gap between the top surface of the supporting plate 32 and the inner circular surface of the cylinder body 2 through the first oil hole 312, the second oil hole 3211 and the third oil hole 323 and forms a static pressure supporting oil film in the gap. According to the self-adjusting piston 3, the spherical groove 311 and the spherical connecting piece 321 are arranged between the supporting plate 32 and the piston post 31, and the movable connection of the spherical groove 311 and the spherical connecting piece 321 can be used for replacing the fixed connection between the supporting plate 32 and the piston post 31, so that the relative bending angle between the spherical groove 311 and the spherical connecting piece 321 can be automatically adjusted when the mandrel 1 is bent, the piston post 31 and the piston cavity 34 always keep normal coaxial sliding, the matched abrasion between the piston post 31 and the piston cavity 34 is avoided, and the service life of the self-adjusting piston 3 can be prolonged.

As shown in fig. 2, the aperture of the second oil hole 3211 may be larger than that of the first oil hole 312, so that the inlet of the second oil hole 3211 always covers the outlet of the first oil hole 312 in the moving range of the spherical connecting piece 321, when the mandrel 1 is bent, the first oil hole 312 is prevented from being blocked by the spherical connecting piece 321, so that the oil supply is not smooth, the smoothness of the oil path is always maintained, and the stability of the oil supply pressure is ensured.

As shown in fig. 3, four static pressure grooves 322 distributed in a matrix form may be formed on the support plate 32, the static pressure grooves 322 are communicated with the third oil hole 323, and hydraulic oil enters a gap between the top surface of the support plate 32 and the inner circular surface of the cylinder 2 after passing through the static pressure grooves 322, and a static pressure supporting oil film is formed in the gap. The provision of the plurality of static pressure grooves 322 can ensure the support stability of each piston rod 31. When the paper web is calendered, the cylinder 2 bends under the action of pressure, and the support plate 32 and a static pressure bearing oil film formed on the surface of the support plate can play a supporting role on the cylinder 2, so that the cylinder 2 is prevented from bending, friction between the support plate 32 and the inner wall of the cylinder 2 is greatly reduced by the static pressure bearing oil film, and the service life of the cylinder 2 is prolonged.

Referring to fig. 2 to 5 again, the utility model also provides a controllable middle-high roller, which comprises a mandrel 1 and a cylinder body 2 rotatably sleeved on the outer diameter side of the mandrel 1, wherein in a working state, the mandrel 1 is kept still, and the cylinder body 2 rotates relative to the mandrel 1. A plurality of piston cavities 34 are axially formed in the mandrel 1, and each piston cavity 34 is internally provided with a self-adjusting piston 3 as described above. By controlling the amplitude of the motion of the self-adjusting piston 3 in different positions, the degree of bending of the cylinder 2 in different positions can be adjusted.

As shown in fig. 4, the two ends of the mandrel 1 are provided with shaft shoulders, the shaft shoulders are provided with bearings 4, the outer diameter of each bearing 4 is sleeved on the inner diameter side of the corresponding barrel 2, the barrel 2 is supported to rotate relative to the mandrel 1 through the bearings 4, an oil cavity is formed between the two bearings 4, and an end cover is arranged on the outer side of each bearing 4 to keep sealing.

The piston chambers 34 are symmetrically arranged on the mandrel 1 at the axial middle point of the cylinder body 2, the arrangement intervals of the adjacent piston chambers 34 are equal, the specific arrangement quantity can be determined according to the length of the mandrel 1, and the number can be even (for example, 6, 8 or 12, etc.) or singular, and it should be noted that when the number is singular, the middle piston chamber 34 is positioned at the axial middle point. When the cylinder 2 is bent, the curvature radius of the two ends of the cylinder is larger than that of the middle part, so that a plurality of piston cavities 34 are arranged at equal intervals, different positions of the cylinder 2 are supported by utilizing different piston columns 31, the curvature change condition of the cylinder 2 can be adapted, and the adjustment effect meeting the requirement is achieved.

As shown in fig. 5, two sides of the mandrel 1 are provided with axially extending process grooves 13, oil guide pipes (not shown in the figure) are installed in the process grooves 13, each piston cavity 34 is connected with an independent oil guide pipe through an oil inlet 11, or a plurality of piston cavities 34 are connected with the same oil guide pipe in groups, and the oil pressure of different oil guide pipes is independently controlled. Through the setting of technology groove 13, avoided the processing difficulty that directly punches and cause on dabber 1, reduced the manufacturing degree of difficulty, when the maintenance, only need change damaged lead oil pipe or sealing member can, easy dismounting and easy maintenance. When the plurality of piston cavities 34 are connected in groups, an inclined hole can be drilled at the inner bottom of the piston cavity 34 (the normal operation of the piston column 31 is not affected) towards the other piston cavity 34 to be connected, meanwhile, the other piston cavity 34 is reversely drilled with the inclined hole, and the two inclined holes are communicated in an intersecting manner to realize the connection of the two piston cavities 34, and the connection of the plurality of piston cavities 34 can be realized in the same way.

As shown in fig. 4, the oil drain hole 12 is formed in the mandrel 1, the oil drain hole 12 is of a 'falling' T-shaped structure, two ends of a vertical portion of the T-shaped structure are arranged on the upper wall of the outer wall of the mandrel 1, the two conditions that the controllable middle-high roller is arranged on the upper portion of the hot roller and the controllable middle-high roller is arranged on the lower portion of the hot roller can be adapted, the universality of the mandrel 1 is improved, and the end head of a horizontal portion of the oil drain hole 12 is arranged on the end face of the mandrel 1.

The principles and embodiments of the present utility model have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present utility model; also, it is within the scope of the present utility model to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the utility model.

Claims (9)

1. A self-adjusting piston, characterized by: including installing piston post and the connection in the piston intracavity are in backup pad on the piston post, the piston post is kept away from the tip in piston chamber is provided with the sphere recess, the activity in the sphere recess be provided with the consistent sphere connecting piece of sphere radian of sphere recess, the sphere connecting piece is connected with the backup pad, the top surface of backup pad is used for steady support to wait to support the piece.

2. The self-adjusting piston of claim 1, wherein: the spherical connecting piece is of a hemispherical structure, and the spherical groove is of a less hemispherical structure.

3. The self-adjusting piston of claim 1, wherein: an annular groove is formed in the inner wall of the piston cavity, a sealing ring is arranged in the annular groove, and the inner diameter side of the sealing ring is in sealing contact with the piston column.

4. The self-adjusting piston of claim 1, wherein: and an oil inlet and outlet hole is formed in the bottom of the piston cavity.

5. The self-adjusting piston of claim 1, wherein: and a capillary channel which is communicated with the piston cavity and the spherical groove is arranged on the piston column.

6. The self-adjusting piston of claim 1, wherein: the top surface of backup pad is the plane.

7. The self-adjusting piston according to any one of claims 1-5, wherein: the piston cavity is arranged on the mandrel, the top surface of the supporting plate is an arc surface, the arc of the arc surface is matched with the arc of the inner circular surface of the cylinder body, a first oil hole communicated with the piston cavity is formed in the piston column, a second oil hole communicated with the first oil hole is formed in the spherical connecting piece, a third oil hole communicated with the second oil hole is formed in the supporting plate, the third oil hole is communicated with a gap between the arc surface and the inner circular surface of the cylinder body, and a static pressure supporting oil film is formed in the gap.

8. The self-adjusting piston of claim 7, wherein: the aperture of the second oil hole is larger than that of the first oil hole, and the inlet of the second oil hole always covers the outlet of the first oil hole in the moving range of the spherical connecting piece.

9. The self-adjusting piston of claim 7, wherein: four static pressure grooves distributed in a matrix form are formed in the supporting plate, and the static pressure grooves are communicated with the third oil hole.