CN205414458U - Core anchor clamps are decided to interior expanding - Google Patents
Core anchor clamps are decided to interior expanding Download PDFInfo
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- CN205414458U CN205414458U CN201620141134.XU CN201620141134U CN205414458U CN 205414458 U CN205414458 U CN 205414458U CN 201620141134 U CN201620141134 U CN 201620141134U CN 205414458 U CN205414458 U CN 205414458U
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- elastic expansion
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Abstract
The utility model discloses a core anchor clamps are decided to interior expanding, the elasticity of coinciding mutually including the dabber, with the dabber axis the expand body, bloated body coupling spare, cone, a fastening nut, the 2nd fastening nut, end pressing plate, end pressing plate is ring shape, elasticity expands, and it is expanded to personally experience sth. Part of the body at least two lamella formulas to personally experience sth. Part of the body is formed by connecting through the body coupling spare that expands, the bloated body of elasticity is followed its axial cross -section of perpendicular to and is ring shape, the both ends medial surface that elasticity expands the body is provided with the outside circular conical surface of opening respectively, the lamella formula expands to personally experience sth. Part of the body and is trapezoidally along its radial cross -section, the cone sets up the both ends at the bloated body of elasticity for a set of and cone in opposite directions, the conical surface of cone cooperatees with the circular conical surface of the bloated body of elasticity, a fastening nut, the 2nd fastening nut, end pressing plate are a set of respectively, a fastening nut sets up respectively and can push in the cone of spindle setting up at the both ends of dabber and a fastening nut, end pressing plate, the 2nd fastening nut set gradually in the cone.
Description
Technical field
This utility model relates to assembling field, especially a kind of internal-expansion type Centering clamp.This utility model can be used in fixing, the clamping of cylinder cover parts, it is particularly suited for the grinding of fragility thin wall cylinder cover parts, meet the process requirements of the cylinder cover parts that petroleum drilling and mining, selecting and purchasing ore deposit etc. are wear-resistant, corrosion-resistant, high temperature high voltage resistant performance requirement is higher, there is preferable application prospect.
Background technology
Petroleum reservoir compared with drilling environment deep, that geologic structure is severe and offshore oil, natural gas development process in, it usually needs use geological prospecting equipment slush pump, and ceramic cylinder jacket be the key fitment of slush pump.Ceramic cylinder jacket is as a kind of consumable accessory, and it uses batch big, and wall is thin, form and position tolerance and surface roughness requirements higher (ceramic cylinder jacket surface roughness can reach 0.2 ~ 0.4 μm), and material and hardness are also had higher requirements by it simultaneously.
Lining of ceramic cylinder jacket earthenware belongs to large diameter thin wall part, and cylinder sleeve external diameter about 165mm, wall thickness is only 5.5mm.Owing to ceramic material thin-walled parts has high intensity, high rigidity and the feature of high fragility, it is in Grinding Process, acted on by cutting force, clamping force, grinding heat and internal stress etc., ceramic cylinder jacket easily produces various types of surface/sub-surface damage, such as deformation layer, surface/Asia crizzle, ambiguity surface, phase change region, residual stress etc., and along with the carrying out of the course of processing, its surface defect also may can spread and come.The existence of aforementioned drawback makes its processing and manufacturing relatively difficult, the dimensional accuracy of impact pottery pipe fitting and form accuracy, it is difficult to ensure the crudy of part.Therefore, clamping tool and method is reasonably selected to be to ensure that the key of lining of ceramic cylinder jacket thin-wall ceramic pipe machining accuracy.
Conventional thin-walled major diameter part when carrying out grinding, first grinding part outer on general-purpose grinder, then inner bore of part, the top location of other end lathe will be clamped in one end scroll chuck of part.When using this installation way to be processed ceramic cylinder jacket, in grinding process, ceramic material is little due to rigidity clamping, contact area, brittle crack easily occurs, affects the performance of product.
At present, the method for improvement mainly uses following two class fixtures to complete the processing of part outer: rigidity mandrel fixture, elastic spindle fixture.Wherein, using rigidity mandrel fixture time workpiece is carried out clamping, workpiece, using the cylindrical of rigidity mandrel as positioning datum, passes through face clamping.When using elastic spindle fixture clamping, workpiece is using the cylindrical of elastic spindle as positioning datum, by tightening or loosening pinching screw, it is achieved moving axially of elastic spindle.Owing to coordinating between rigidity mandrel and elastic spindle is cone match, therefore, while elastic spindle is axially moveable, it will produce distending radially or contraction, thus realize the radial clamping to workpiece or unclamp.
Undeniable, the advantage of aforementioned two class fixtures is apparent from.When the machining accuracy of part to be processed endoporus is higher, the fit clearance between rigidity mandrel fixture and workpiece is the least, makes the contact stiffness between workpiece and fixture the highest, improves the ability of workpiece opposing chip force deformation.Simultaneously as rigid central spindle's clamp structure is simple, number of parts is less, and the error link of generation is few, thus is readily available the higher fixture accuracy of manufacture, and manufacturing cost is the lowest.And the radial direction expansible of elastic spindle fixture makes it be especially suitable for the processing of the poor bulk of components of hole size concordance.
But, find after serious analysis, in application, there is significant limitation in this two classes fixture.Wherein, the size adaptability of rigidity mandrel fixture is poor, and it requires that the hole size precision of part to be processed is increased, otherwise, rigidity mandrel will and different workpieces endoporus between radial fit gap difference suddenly big or suddenly small, it is impossible to ensure bulk of components to the requirement of positional precision between positioning datum and cylindrical.And though elastic spindle fixture is adapted to hole size fluctuation bigger bulk of components processing, due on spring leaf the radial direction distending of each point all launch with its root for the center of circle, the radial direction distending amount of each point cylindrical is different in the axial direction.And for some the most yielding part, such as sleeve thin wall component, the clamping force of elastic central spindle's fixture is the most serious to the negative effect of part to be processed cylindrical precision.
To this end, in the urgent need to a kind of new fixture to solve the problems referred to above.
Utility model content
Goal of the invention of the present utility model is: carries out clamping for large diameter thin wall part (especially lining of ceramic cylinder jacket earthenware) and adds man-hour, the size adaptability of rigidity mandrel fixture is poor, and use the poor problem of the precision of elastic central spindle's fixture, a kind of internal-expansion type Centering clamp, a kind of internal-expansion type Centering clamp for thin-walled tubular workpiece are provided.This utility model relates to field of machining, is particularly well-suited to the clamping of fragility thin wall cylinder cover parts, can be used for the operations such as corresponding grinding.This utility model can be used in the clamping to tubular workpiece, meets the following process demand of its cylindrical and end face.This utility model uses the radial clamping mode of Double-conical-surface, the internal-expansion type face achieved between workpiece with fixture contacts, clamped one time can meet the clamping demand of multiple operation, it is effectively guaranteed the machining accuracy of workpiece, simultaneously, achieve automatically reseting of elastic expansion body by O, realize self-centering function by the swollen body of flap-type.This utility model is reasonable in design, easy to use, it is possible to realizes the clamping to tubular workpiece (especially thin-walled tubular workpiece), has preferable application prospect.Through practical measurement, use this utility model that ceramic cylinder jacket is processed, the ceramic cylinder jacket processed has higher machining accuracy, it is possible to meets the needs of the workplace that petroleum drilling and mining, selecting and purchasing ore deposit etc. are wear-resistant, corrosion-resistant, high temperature high voltage resistant performance requirement is higher, has preferable effect.
The technical solution adopted in the utility model is as follows:
A kind of internal-expansion type Centering clamp, the elastic expansion body coincided including mandrel and mandrel axis, swollen body connector, cone, the first clamp nut, the second clamp nut, end clamp plate, described end clamp plate is annular；
Described elastic expansion body is formed by connecting by swollen body connector by the swollen body of at least two flap-type, and described elastic expansion body is annular along being perpendicular to its axial cross section；
The two ends medial surface of described elastic expansion body is respectively arranged with the taper seat of outward opening, described flap-type is swollen, and body cross section radially is trapezoidal, described cone is one group and cone is oppositely arranged at the two ends of elastic expansion body, and the conical surface of described cone matches with the taper seat of elastic expansion body；
Described first clamp nut, the second clamp nut, end clamp plate are respectively one group, described first clamp nut is separately positioned on the two ends of mandrel and the cone being arranged on mandrel can be extruded by the first clamp nut, and described end clamp plate, the second clamp nut are successively set in cone.
Described elastic expansion body is made up of 3 ~ 8 swollen bodies of flap-type.
Described elastic expansion body is made up of 3 swollen bodies of flap-type.
Described mandrel is cylindrical.
Described flap-type is swollen, and body uses aluminium to be prepared from.
Described swollen body connector includes O and the ring flat-plate of elastic expansion mates, screw, and the outside of described flap-type is swollen body is provided with the groove matched with O, and described O is arranged in groove, and described ring flat-plate is connected by screw body swollen with flap-type.
The application of aforementioned internal-expansion type Centering clamp, is used for the clamping of tubular workpiece by this internal-expansion type Centering clamp.
This internal-expansion type Centering clamp is used for ceramic cylinder jacket grinding.
Comprise the steps: first end clamp plate, the second clamp nut to be successively set in cone, constitute end outer cone, an end outer cone is arranged on one end of mandrel again, again elastic expansion body, workpiece to be processed are sequentially sleeved on mandrel, another end outer cone is arranged on the other end of mandrel again, finally the first clamp nut is separately positioned on the two ends of mandrel, and is coordinated by the taper seat between cone with elastic expansion body workpiece to be processed is positioned on elastic expansion body.
Described first clamp nut lays respectively at the outside of cone.
End clamp plate, the second clamp nut are taken off respectively, the pipe end of workpiece to be processed can be processed.
For foregoing problems, this utility model provides a kind of internal-expansion type Centering clamp.This internal-expansion type Centering clamp includes the elastic expansion body that mandrel and mandrel axis coincide, swollen body connector, cone, the first clamp nut, the second clamp nut, end clamp plate, and end clamp plate is annular.Wherein, the second clamp nut, end clamp plate, cone are respectively one group, and end clamp plate, the second clamp nut are successively set in cone.Using this structure, tubular workpiece (especially thin-walled tubular workpiece) can be positioned by end clamp plate, and during clamp, using the teaching of the invention it is possible to provide support accordingly.
In this utility model, elastic expansion body is formed by connecting by swollen body connector by the swollen body of at least two flap-type, and elastic expansion body is annular along being perpendicular to its axial cross section.The two ends medial surface of elastic expansion body is respectively arranged with the taper seat of outward opening, and flap-type is swollen, and body cross section radially is trapezoidal, and cone is one group and cone is oppositely arranged at the two ends of elastic expansion body, and the conical surface of cone matches with the taper seat of flexible cone.Use this structure, inside the two ends of elastic expansion body, form the taper seat that big mouth is outside, cooperating of the taper seat of the conical surface of cone and elastic expansion body, coordinate so that form taper seat between elastic expansion body and cone.Meanwhile, this fixture also includes that the first clamp nut, the first clamp nut are separately positioned on the two ends of mandrel and the cone being arranged on mandrel can be extruded by the first clamp nut.Use this structure, by regulating first clamp nut relative position on mandrel, it is possible to cone, elastic expansion body are extruded, and then realizes this utility model clamping to workpiece.
When using this utility model that workpiece is carried out clamping, first end clamp plate, the second clamp nut are successively set in cone, constitute end outer cone, one end outer cone is arranged on one end of mandrel, again elastic expansion body, workpiece to be processed are sequentially sleeved on mandrel, afterwards, another end outer cone is arranged on the other end of mandrel, finally the first clamp nut is separately positioned on the two ends of mandrel, by regulating the position of the first clamp nut, allow the taper seat between cone and elastic expansion body be in close contact, make workpiece to be processed be positioned on elastic expansion body.Use this utility model, it is possible to realize the clamping to tubular workpiece (especially thin-walled tubular workpiece, such as ceramic cylinder jacket etc.), to carry out the operations such as grinding.
After the processing completing workpiece body, end clamp plate, the second clamp nut are taken off respectively, keep the first clamp nut invariant position, owing to Workpiece length is slightly longer than the swollen body of flap-type, the end face of workpiece to be processed can be processed.Use this utility model, it is achieved that clamped one time completes the processing of multiple working procedure, and the dimensional accuracy of workpiece and the accuracy of form and position can preferably be ensured.After completing the outer round surface of workpiece, end face processing, unclamping the first clamp nut, flap-type is swollen, and body returns in situ, to realize pulling down and the clamping of next part workpiece of workpiece under the elastic shrinkage effect of O.
Elastic expansion body is made up of 3 ~ 8 swollen bodies of flap-type, is preferably and is made up of 3 swollen bodies of flap-type.In this utility model, flap-type is swollen, and body coordinates face all with the tapered identical conical surface with interpyramidal, and tightening of the first clamp nut can cause moving axially of cone with unscrewing, and then drives the swollen body of flap-type radially to stretch, produce distending radially or contraction, it is achieved to the clamping of workpiece with unclamp.
Further, swollen body connector includes O and the ring flat-plate of elastic expansion mates, screw, and the outside of flap-type is swollen body is provided with the groove matched with O, and O is arranged in groove, and ring flat-plate is connected by screw body swollen with flap-type.In this structure, by O, the interconnection function of ring flat-plate, swollen for flap-type body is connected into elastic expansion body.
This utility model is with Conventional processing methods difference, " stiff points contact " in the past is changed into " contact of internal-expansion type face ", add clamping area, clamping force is made to be uniformly distributed on thin-wall ceramic pipe, and increase thin-walled parts rigidity in the course of processing, decrease the vibration of workpiece, improve the machining accuracy of ceramic material.
Clamping mode of the present utility model is unique, and ceramic cylinder jacket internal-expansion type Centering clamp uses radial clamping mode, different from the spring leaf elastic deformation clamping mode of elastic spindle fixture.The swollen body of flap-type being separated from each other by polylith due to elastic expansion body forms, by regulating the position of the first clamp nut, can make to keep between cone and elastic expansion body being in close contact, i.e. when cone translates along mandrel, clamping force is uniformly distributed on thin-wall ceramic pipe, now can realize the function automatically determining axle center of workpiece.Now, the radial dimension of change of flap-type is swollen body each point cylindrical vertically is consistent, and workpiece is basically identical with the clamping force of the radial direction that elastic expansion body contacts, it is to avoid the local of workpiece causes local deformation because of the difference of clamping force.
It addition, clamping mode of the present utility model is manual mode, workpiece loading and unloading is easy.Workpiece, after cylindricalo grinding completes, is pulled down end clamp plate and can be carried out cross grinding, it is achieved that clamped one time completes the processing of different operation, it is ensured that the dimensional accuracy of earthenware and the accuracy of form and position.
Meanwhile, this utility model is less demanding to clamp material, and the material of the swollen body of key components and parts-----flap-type in fixture uses general aluminum material, different from elastic spindle, it is not necessary to use elastic bigger material manufacture.The advantage of elastic expansion body aluminium prepared material is as follows: be on the one hand that aluminium density is little, it is possible to alleviate the weight of fixture；On the other hand it is that aluminium material is soft, little to the contact stress of earthenware inwall.The material of remaining parts is common materials, and such as 45 steel, Q235 etc., in principle, material possesses preferable wearability can meet use requirement of the present utility model.
In sum, internal-expansion type Centering clamp of the present utility model is to design the special fixture of use for solving large diameter thin wall cylinder sleeve class part outer and the high-precision requirement of cross grinding processing aborning.Production practices show, the use of this fixture decreases the uneven distortion inaccuracy producing earthenware of clamp force distribution, and end clamp plate pulled down after cylindricalo grinding completes by earthenware can carry out cross grinding, achieve clamped one time and complete the processing of different operation, substantially increase machining accuracy and the production efficiency of earthenware.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the structural representation of internal-expansion type Centering clamp in embodiment 1.
Fig. 2 is that the A-A of Fig. 1 is to sectional view.
Labelling in figure: 1 is mandrel, 2 is elastic expansion body, and 3 is cone, and 4 is the first clamp nut, and 5 is the second clamp nut, and 6 is end clamp plate, and 7 is O, and 8 is ring flat-plate, and 9 is screw, and 10 is lined ceramics pipe.
Detailed description of the invention
Below in conjunction with the accompanying drawings, this utility model is described in detail.
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain this utility model, is not used to limit this utility model.
Embodiment 1
As it can be seen, the internal-expansion type Centering clamp of the present embodiment, the elastic expansion body 2 coincided with mandrel 1 axis including mandrel 1, swollen body connector, cone the 3, first clamp nut the 4, second clamp nut 5, end clamp plate 6, end clamp plate 6 is in annular.In the present embodiment, elastic expansion body 2 uses 3 swollen bodies of flap-type to be formed by connecting by swollen body connector, and elastic expansion body 2 is annular along being perpendicular to its axial cross section.The two ends medial surface of elastic expansion body 2 is respectively arranged with the taper seat of outward opening, and flap-type is swollen, and body cross section radially is trapezoidal, and cone 3 is one group and cone 3 is oppositely arranged at the two ends of elastic expansion body 2, and the conical surface of cone 3 matches with the taper seat of elastic expansion body 2.In the present embodiment, swollen body connector includes ring flat-plate 8, the screw 9 that O 7 matches with elastic expansion body 2, and the outside of flap-type is swollen body is provided with the groove matched with O 7, and O 7 is arranged in groove, and ring flat-plate 8 is connected by screw 9 body swollen with flap-type.
First clamp nut the 4, second clamp nut 5, end clamp plate 6 are respectively one group, first clamp nut 4 is separately positioned on the two ends of mandrel 1 and the cone 3 being arranged on mandrel 1 can be extruded by the first clamp nut 4, and end clamp plate the 6, second clamp nut 5 is successively set in cone 3.
Use this device as follows to the clamping process of liner earthenware 10.
First end clamp plate the 6, second clamp nut 5 is successively set in cone 3, constitutes end outer cone.One end outer cone is arranged on one end of mandrel 1.Again elastic expansion body 2, lined ceramics pipe 10 to be processed are sequentially sleeved on mandrel 1.Afterwards, another end outer cone is arranged on the other end of mandrel 1, finally the first clamp nut 4 is separately positioned on the two ends of mandrel 1.By regulating the position of the first clamp nut 4, allow the taper seat between cone 3 and elastic expansion body 2 be in close contact, make lined ceramics pipe 10 to be processed be positioned on elastic expansion body 2.After lined ceramics pipe 10 positioning and clamping completes, it is possible to utilize skive to carry out the operations such as Cylindrical Grinding Processes on cylindrical grinder.
After the processing completing lined ceramics pipe 10 body, end clamp plate the 6, second clamp nut 5 is taken off respectively, keep the first clamp nut 4 invariant position, owing to Workpiece length is slightly longer than the swollen body of flap-type, now the end face of lined ceramics pipe 10 to be processed can be processed.Can preferably be ensured it is achieved thereby that clamped one time completes the processing of multiple working procedure, the dimensional accuracy of lined ceramics pipe 10 and the accuracy of form and position.After completing the outer round surface of lined ceramics pipe 10, end face processing, unclamping the first clamp nut 4, flap-type is swollen, and body returns in situ, to realize pulling down and the clamping of next part workpiece of lined ceramics pipe 10 under the elastic shrinkage effect of O 7.
Use this utility model, it is possible to realize tubular workpiece especially thin-walled tubular workpiece, such as the clamping of ceramic cylinder jacket etc., to carry out the operations such as grinding.In this utility model, in elastic expansion body 2, the quantity of the swollen body of flap-type suitably can increase and decrease according to the size of workpiece to be machined hole size.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all any amendment, equivalent and improvement etc. made within spirit of the present utility model and principle, within should be included in protection domain of the present utility model.
Claims (6)
1. an internal-expansion type Centering clamp, it is characterized in that, the elastic expansion body (2) coincided including mandrel (1) and mandrel (1) axis, swollen body connector, cone (3), the first clamp nut (4), the second clamp nut (5), end clamp plate (6), described end clamp plate (6) is in annular；
Described elastic expansion body (2) is formed by connecting by swollen body connector by the swollen body of at least two flap-type, and described elastic expansion body (2) is annular along being perpendicular to its axial cross section；
The two ends medial surface of described elastic expansion body (2) is respectively arranged with the taper seat of outward opening, described flap-type is swollen, and body cross section radially is trapezoidal, described cone (3) is one group and cone (3) is oppositely arranged at the two ends of elastic expansion body (2), and the conical surface of described cone (3) matches with the taper seat of elastic expansion body (2)；
Described first clamp nut (4), the second clamp nut (5), end clamp plate (6) are respectively one group, described first clamp nut (4) is separately positioned on the two ends of mandrel (1) and the cone (3) being arranged on mandrel (1) can be extruded by the first clamp nut (4), and described end clamp plate (6), the second clamp nut (5) are successively set in cone (3).
Internal-expansion type Centering clamp the most according to claim 1, it is characterised in that described elastic expansion body (2) is made up of 3 ~ 8 swollen bodies of flap-type.
Internal-expansion type Centering clamp the most according to claim 2, it is characterised in that described elastic expansion body (2) is made up of 3 swollen bodies of flap-type.
Internal-expansion type Centering clamp the most according to claim 1, it is characterised in that described mandrel (1) is cylindrical.
Internal-expansion type Centering clamp the most according to claim 1, it is characterised in that described flap-type is swollen, and body uses aluminium to be prepared from.
6. according to internal-expansion type Centering clamp described in any one of claim 1 ~ 5, it is characterized in that, described swollen body connector includes ring flat-plate (8), the screw (9) that O (7) matches with elastic expansion body (2), the outside of described flap-type is swollen body is provided with the groove matched with O (7), described O (7) is arranged in groove, and described ring flat-plate (8) is connected by screw (9) body swollen with flap-type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620141134.XU CN205414458U (en) | 2016-02-25 | 2016-02-25 | Core anchor clamps are decided to interior expanding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620141134.XU CN205414458U (en) | 2016-02-25 | 2016-02-25 | Core anchor clamps are decided to interior expanding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205414458U true CN205414458U (en) | 2016-08-03 |
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ID=56541482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620141134.XU Expired - Fee Related CN205414458U (en) | 2016-02-25 | 2016-02-25 | Core anchor clamps are decided to interior expanding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205414458U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105522182A (en) * | 2016-02-25 | 2016-04-27 | 四川聚能核技术工程有限公司 | Internal expansion centering clamp and application thereof |
| WO2024120017A1 (en) * | 2022-12-09 | 2024-06-13 | 浙江亚微精密机床有限公司 | Multi-lobe nut having floating nut lobes |
-
2016
- 2016-02-25 CN CN201620141134.XU patent/CN205414458U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105522182A (en) * | 2016-02-25 | 2016-04-27 | 四川聚能核技术工程有限公司 | Internal expansion centering clamp and application thereof |
| WO2024120017A1 (en) * | 2022-12-09 | 2024-06-13 | 浙江亚微精密机床有限公司 | Multi-lobe nut having floating nut lobes |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180503 Address after: 621700 Huafeng new village, Jiangyou City, Mianyang, Sichuan Province, No. 9 Patentee after: Inst. of Materials, Chinese Academy of Engineering Physics Address before: 621700 De Sheng Nan Road, Jiangyou City, Mianyang, Sichuan Province, No. 87 Patentee before: Sichuan Juneng Nuclear Technology Engineering Co., Ltd. |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160803 Termination date: 20200225 |
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| CF01 | Termination of patent right due to non-payment of annual fee |