CA2120962A1 - Method and device for securing an object against an inner surface of a hollow cylinder - Google Patents
Method and device for securing an object against an inner surface of a hollow cylinderInfo
- Publication number
- CA2120962A1 CA2120962A1 CA 2120962 CA2120962A CA2120962A1 CA 2120962 A1 CA2120962 A1 CA 2120962A1 CA 2120962 CA2120962 CA 2120962 CA 2120962 A CA2120962 A CA 2120962A CA 2120962 A1 CA2120962 A1 CA 2120962A1
- Authority
- CA
- Canada
- Prior art keywords
- cylinder
- pin
- positioning
- sharp projection
- hollow cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000006073 displacement reaction Methods 0.000 claims abstract description 7
- 238000003825 pressing Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- WWYNJERNGUHSAO-XUDSTZEESA-N (+)-Norgestrel Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](CC)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 WWYNJERNGUHSAO-XUDSTZEESA-N 0.000 description 1
- 101100524753 Bacillus subtilis (strain 168) ribR gene Proteins 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/30—Compensating imbalance
- G01M1/36—Compensating imbalance by adjusting position of masses built-in the body to be tested
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/10—Removing condensate from the interior of the cylinders
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/0073—Accessories for calenders
- D21G1/008—Vibration-preventing or -eliminating devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/30—Compensating imbalance
- G01M1/32—Compensating imbalance by adding material to the body to be tested, e.g. by correcting-weights
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Paper (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Drying Of Solid Materials (AREA)
Abstract
METHOD AND DEVICE FOR SECURING AN OBJECT
AGAINST AN INNER SURFACE OF A HOLLOW CYLINDER
ABSTRACT OF THE DISCLOSURE
An object, such as a balancing weight or a turbulence-producing strip, is pressed against an inner surface of a hollow cylinder preferably utilizing radially oriented springs. Positioning pins are partially disposed in the object. Each pin has a point which is driven into the hollow cylinder to position the object securely against the inner surface of the cylinder to prevent displacement of the object with respect thereto. The positioning pins are made from a material which is harder than that of the hollow cylinder.
AGAINST AN INNER SURFACE OF A HOLLOW CYLINDER
ABSTRACT OF THE DISCLOSURE
An object, such as a balancing weight or a turbulence-producing strip, is pressed against an inner surface of a hollow cylinder preferably utilizing radially oriented springs. Positioning pins are partially disposed in the object. Each pin has a point which is driven into the hollow cylinder to position the object securely against the inner surface of the cylinder to prevent displacement of the object with respect thereto. The positioning pins are made from a material which is harder than that of the hollow cylinder.
Description
212~962 METHOD AND DEVICE FOR SECURING AN OBJECT
AGAINST AN INNER SURFACE OF A XOLLOW CYLINDER
The invention relates to methods and devices for positioning objects with respect to one ano~her and in particular to methods and devices for positioning and securing an object against an inner surface of a hollow cylinder to prevent displacement of the object with respact to the cylinder~s inner surface.
Hollow cylinders or roll~ utilized as drying cylinders in paper manufac~uxing or paper proce~sing machines may be equipped with elements that are dlspo3ed within the hollow cyli.nder and pressed agains~
an inner surface thereof. For example, balancing weights and/or ~trip~ which cause turbulence in the conden~ate accumulating at the cylinder inner surface may be positioned against the i.nner ~urface. The balancing weights or turbulence-prcducing strip~ are held at the inner surface of the cylinder by a holding force which may be applied by a ~pring, screw, or magnet.
The following publication~ disclose various hollow cylinders and means for holding an object at an inner surface thereo~: DE 26 59 130 (corresponding to Banzhaf et al. U.S. Patent No. 4,235,124 issued November 25, 19aO), DB 28 49 454 (corre~ponding to Schiel, U.S. Patent No. 4,282,656, is~ued August 11, 1981), DE 29 03 784 (corresponding to Schiel/ U.S.
Patent No. 4,267,644 issued May 19, 1981) and Wedel, U.S. Patent No. 4,369,586, issued January 25, 1983.
According to DE 26 59 130, a balancing weight which i~ held between an inside surface of a roll ~hell and an U-shaped groove. The weight i~ pressed again~t an inside surface of the cylinder by force applied by a radially oriented spring and by cen~rifugal force during operation. Thus, the weight is not secured ~o the inner surface of the cylinder in a manner to 2~20~2 prevent displacement of the weight with respect to the cylinder surface.
DE 28 49 454 and DE 29 03 784 each disclose a drying cylinder having objects ~ecured to an inner surface thereof. The objects are condensate turbulence producing strips which extend essentially parallel to the axis of rotation of the cylinder. The strips can be pressed ayainst the inner surface of the cylinder by springs, for example. Furthermore, the strips are positioned against ~he cylinder utilizing positioning elementg 90 that the 9trips do not ~hift with respect to the inner surface of the cylinder. The positioning elements are cylinder'pins which are secured ~o the strip and extend into a bore of the cylinder which may be undesirable because any bore made into the cylinder weakens the cylinder wall. A further consideration is that chips produced during the boring operation must be removed, requiring additional manufacturing time and expense when the drying cylinder would otherwise be ready for use. In some instancles, it is not possible ~o form bores inside a cylinder because sufficient space i9 not available.
According to U.S. Patent No. 4,369,586, the head of a siphon for removing condensate is secured to an in3ide wall of a hollow cylinder utilizing screws.
Additional means for securing the siphon head in a selected position to guard against displacement of the ~iphon head with respect to the cylinder wall are not disclosed. Thus, there is a danger that a~ a result of different thermal expansions of the siphon head and the cylinder, th~ screw connection will loosen.
Attempts have been made to secure certain objects, such as balancing weight~, to an inner surface of a cylinder by adhesive bondlng. However, such methods have not been found to be sufficiently reliable, especially when the hollow cylinder i3 a heated drying cylinder. Not even the best adhesives - currently available have exhibited sufficient thermal stability for u~e in a drying cylinder.
2 ~ 2 It i an ob~ct of th~ invontlon to obvi~t~ or ~itigat~ at lea3t one of ~he problem~ described above.
According to one aspect of the invention, a m~thod and device for positioning an obj~ct aga~nst an inner surEace sf a hollow cyli~der and ~ecuring the object thereagainst in a manner to prev@nt displace~ent o~ the object with respect to th~ inn~r ~r~ce includ~
providing a device for po3itioning the object agai~st the inner surface adapted to penetrate the hollow cylinder. The po~itioning device inclu~e~ at least one positioning pin disposed at a side of ~he o~ject. The pin has a sharp projec~ion. Th~s inventive method include~ the step of driving thle sharp projection into the cylinder at the inner surface.
Other objects and adviantage~ of th~ invention will be apparent to those skilled in the art from the following detailed de3cription taken i~ conjunction with ~he drawings and the appended claims.
Pre~erred embodiment~ of the pre~ent invention :~
will now be descri~ed, by way of example only, with referenc~ to the attached Figures, wher~in: :
Fig. 1 is a partially schema~ic sectional view of a device according to the invention.
Fig. 2 i~ a partially schematic ~ectional view o~ a second emhodiment of a devicc according to the in~ention.
Fig. 3 is a partially ~chematic sectional view of a third embodiment of a devic~ according to the invention.
~ ig. 4. i~ a par~ially schematic ~ectional view of a siphon shoe screwed into an inner cylinder wall secured into position by a fourth embodiment of a device according to the invention.
Fig. S is a partially schematic longitudinal sectional view taken along line V-V of Fig. 4 showing 2~ 20962 the fourth embodiment of a device according to the invention.
Fig. 6 is a partially schematic sectional view of an inte~nally ribbed drying cylinder utilizing a fifth embodiment of a device according to the invention.
Fig. 7 is a partially schematic longitudinal sectional view taken along line VII-VII of Fig. 6 showing the fifth embodiment of a device according to the invention.
Fig. 8 is a partially schematic cross-sectional view of a guide roll showing a sixth embodiment of a device~ according to the invention.
Fig. 9 is a partially schematic sectional view of a seventh embodiment of a device according to the invention.
Fig. 10 is a partially schematic longitudinal sectional view of a drying cyliIlder showing an eighth embodiment o~ a device accordin~7 to the invention.
Fig. 11 is a partial cro3s-3ectional view of a hollow cylinder including nin~:h and tenth embodiments of a device according to the invention.
~ device and method according to the 2~ invention reduces the expense typically encountered in mounting an object against an inner surface of a hollow cylinder so that it is positioned securely against the cylinder with any shifting or displacement between the object and the cylinder being kept at a minimum. In various embodiments of the invention, bores need not be made in the inner cylinder wall to provide means for securing the object to the cylinder wall. It has been found that a positioning element or elements preferably having two sharp projections which are driven into the hollow cylinder or shell may be utilized for this purpose. The frictional engagement between the points of the sharp projections and the cylinder wall in combination with a force which presses the object against the wall, securely positions the object against the wall.
212~9~2 Fig. 1 illustrates an embodiment of a device according to the invention wherein an object or part 2 is pressed against an inside wall W of a hollow cylinder or roll shell 1 by a force of a biasing mechanism shown as springs B. A positioning pin 3 having a substantially sharp projection or point 4 i9 substantially disposed in a blind bore 5 of the object 2 with the projection 4 protruding out of the object 2.
According to a method of the invention, the sharp projection 4 is driven into the cylinder 1 at a surface W thereof (i.e. pressed into the cylinder in a non-cutting manner), forming a recess in the cylinder 1, with the projection 4 frictionally engaging the cylinder 1. The steps oE pres~ling the object 2 against the inner ~urface W of the cyli.nder 1 and of driving the sharp projection 4 lnto the inner surface W may be performed simultaneously. The projection 4 preferably ~0 penetrates about 0.25 mm to about 2~5 mm into the cylinder 1.
In Fig. 2, another embodiment of a device according to the inventlon is shown wherein an object 2a is pressed against an inside wall of a hollow cylinder or roll shell la by the force of biasing means shown as springs B. A positioning pin 3a having a substantially sharp projection 4a is substantially disposed in a blind bore 5a of the object 2a with the projection 4a protruding out of the object 2a.
According to a method of the invention, the sharp pro~ection 4a is driven into the cylinder la similarly to what is described herein with respect to Fig. 1.
The pin 3a also includes a shoulder 6a which encircles the projection 4a and i9 shown seated against the inner wall of the cylinder la. The shoulder 6a is substantially perpendicular to an axis of a shaft 7a of ' the pin 3a running through a point of the projection 4a.
With reference to Fig. 3, a third embodiment of a device according to the invention includes elements designated by the reference n~merals lb, ~b, ~11 2~9~2 3b, 4b, and 7b, which substantially correspond in design and function to the elements designated by the reference numerals la, 2a, 3a, 4a, and 7a, respectively, described herein with respect to Fig. 2.
The object 2b has a throughbore 5b. The positioning pin 3b i~ frictionally held again~t walls of the bore 5b by a press fit. In the embodiment of the invention 3hown in Fig. 3, the positioning pin 3b includes an annular groove G disposed in an end surface 6b.
Material that is pressed out of the cylinder lb when the projection 4b is dri~en into the wall of the cylinder lb collects in the groove G. The positioning pin 3b i~ pres3ed in ~r hammered into the cylinder lb from an open end of the bore 5b, using a press or hammer, for example.
Fig. 4 shows a siphon. shoe 9 secured with Rcrews 10 on a hollow cylinder lc. The ~crews 10 extend through throughbores 11 of the ~iphon shoe 9 and are Rcrewed into a threaded bore 12 of the cylind~r lc.
Since there is a clearance between the screws 10 and the throughbore3 11, the sipho~l shoe 9 may shift a distance approximately equal to the 8i2e of this clearance when under the influence of transverse forces, thus loosening the screw~ 10.
However, as 3hown in Fig. 5, ~uch a shift is sub~tantially prevented by utilizing an embodiment of a device according to the invention wherein positioning pin~ 3c ~imilar in design and function to the pins 3 described with re3pect to Fig. 1 are di~posed in the shoe 9. The pins 3c are substantially disposed in blind bores 5c of the shoe 9 and are each seated against a wall defining an end or base of the bore 5c.
Projections 4c of the pins 3c are driven into the cylinder lc. A~ a result, the siphon sho~ 9 i5 fixed in a position and secured against rotation with respect to the cylinder lc.
Fig~. 6 and 7 illustrate a sub~tantially rectangular conden~ate collecting tube 13 supported on peripheral ri~s 14 of a hollow cylinder ld which can be shifted in a longitudinal direction (i.e. with respect to the length of the cylinder). In order to prevent 2~2~2 migration of the tube 13 in a peripheral direction (i.e. transverse to the longitudinal direction), a two-part guide piece 15 is clamped securely on the inner peripheral ribR 14 of the cylinder wall ld using a3sembly screws 16. A device according ~o the invention includes positioning pins 3d having projections 4d which are inserted into at lea~t one of the two parts of the guide piece 15. When the assembly screws 16 are tightened, the projections 4d of the po~itioning pin3 3 press into the side3 of the peripheral rib~ 14, thereby securing the guide piece 15 to the rib 14 at a selected location. Alternatively, a tool may be utilized to pre-form holes for the projections 4d in a selected location prior to seating the guide pieces 15 on the ribs 14.
Fig. 8 shows balancing weights 17, which are pressed again~t an inner surface of a hollow cylinder le by springs 19 connected to a common holding frame 18. In order to prevent undesirable shifting of the Z0 balancing weights 17 with re~pe!ct to the inner surface of the cylinder le when vibration3 occur, for example, a device according to the invention is provided ha~ing positioning pins 3e with projec:tions 4e which are inserted in the weights 17. The projections 4e are driven into the hollow cylinder le.
Fig. 9 3how~ another embodiment of a device according to the invention. An object or part shown as a balancing weight 2f is pressed against a hollow cylinder lf by a pressing force designated by an axrow F. Two po~itioning pins 3f with conical projections 4f are dispo~ed in throughbores 5f of the weight 2f. The pins 3f each ha~e a length which is shorter than a length of a corresponding throughbore 5f. The conical projections 4f are driven into the cylinder lf. Grain-or chisel cuts 20 are made in the weight 2f near anopening of the bores 5f which cause a portion of a wall defining each bore 5f to defonm, thereby narrowing the bore 5f, the deformed wall contacting the pin 3f and preventing loosening (i.e. axial shifting in the direction of the bore opening) of the pin 3f in the bore 5f.
212~2 With respect to Fig. 9, a method according ~o the invention preferably includes the sequential steps of introducing the pin 3f into the throughbore 5f, pressing the weight 2f against an inner surface of the cylinder lf, driving the pin 3f into the cylinder lf, and axially fixing the pin 3f within the throughbore 5f by deforming a wall defining the throughbore Sf.
In Fig. 10, an object 2g illustrated as a condensate turbulence-producing strip, is shown mounted parallel to an axis of a cylinder lg and pressed by springs l9g thereagainst. Another embodiment of a device according to the invention, illustrated by position:ing pins 3g having projection~ 4g partially disposed in the strip 2g preven.t shifting or rotation of the strip 2g relative to the cylinder lg.
Instead of the sprinss 19, magnet~ may be u~ed to hold the strips 2g against the cylinder lg.
Also, the strips 2g may be composed of magnets, optionally combined with other materials.
Fig. 11 shows two em~)odiments of a devic~
according to the invention, one of which ~hows a strip 2h mounted on a hollow cylinder lh in a direction parallel to an axis of the cylinder lh. The ~trip 2h i9 held at an inside wall of the cylinder 1 by horseshoe magnets 21 which surround the strip 2h. The poles of the hor~eshoe magnets 21 are designated by the numerals N and S. The strip 2h i~ secured to the cylinder lh in a manner substantially preventing di~placement of the strip 2h with respect thereto, by a positioning pin 3h ha~ing a projection 4h. The pin 3h i5 substantially disposed in a throughbore 5h of the strip 2h. The projection 4h can be conical or wedge-shaped and i3 driven into the cylinder lh.
¦ Instead of a positioning pin 3h, a positioning ~crew (not shown) having a wedge-~haped projection can be provided which i9 ~crewed into the ~trip 2h. When the wedge-shaped projection i8 driven into the cylinder lh according to a method of the invention, the ~crew cannot un3crew from the thread, i.e., the wedge-shaped point ensures that the positioning screw does not turn.
2~2~9~2 g Fig. 11 shows another embodiment of a device according to the invention wherein strips 2i made from rod-shaped magnets aligned behind one another are held within a track 22. Positioning pins 3i are substantially disposed in the strips 2i. Each of the pins 3i includes a projection 4i which i9 driven into the hollow cylinder lh.
With respect to all of the embodiments of devices according to the in~ention described herein, the positioning pins (or at least the projections of the positioning pins)~are made of material that i9 harder than the material of the hollow cylinder, or the projection3 are other~ise hardened so that they can be driven easily into the relatively soft material of the cylinder. Also, projections may be formed on the positioning pins and then the projections hardened to result in a driving point which i9 harder than the material of the hollow cylinder.
The foregoirlg detailed description is given for clearness of under3tanding only, and no unnecessary limitations should be understood therefrom, as modifications within the scope of the invention will be apparent to those skilled in the art.
AGAINST AN INNER SURFACE OF A XOLLOW CYLINDER
The invention relates to methods and devices for positioning objects with respect to one ano~her and in particular to methods and devices for positioning and securing an object against an inner surface of a hollow cylinder to prevent displacement of the object with respact to the cylinder~s inner surface.
Hollow cylinders or roll~ utilized as drying cylinders in paper manufac~uxing or paper proce~sing machines may be equipped with elements that are dlspo3ed within the hollow cyli.nder and pressed agains~
an inner surface thereof. For example, balancing weights and/or ~trip~ which cause turbulence in the conden~ate accumulating at the cylinder inner surface may be positioned against the i.nner ~urface. The balancing weights or turbulence-prcducing strip~ are held at the inner surface of the cylinder by a holding force which may be applied by a ~pring, screw, or magnet.
The following publication~ disclose various hollow cylinders and means for holding an object at an inner surface thereo~: DE 26 59 130 (corresponding to Banzhaf et al. U.S. Patent No. 4,235,124 issued November 25, 19aO), DB 28 49 454 (corre~ponding to Schiel, U.S. Patent No. 4,282,656, is~ued August 11, 1981), DE 29 03 784 (corresponding to Schiel/ U.S.
Patent No. 4,267,644 issued May 19, 1981) and Wedel, U.S. Patent No. 4,369,586, issued January 25, 1983.
According to DE 26 59 130, a balancing weight which i~ held between an inside surface of a roll ~hell and an U-shaped groove. The weight i~ pressed again~t an inside surface of the cylinder by force applied by a radially oriented spring and by cen~rifugal force during operation. Thus, the weight is not secured ~o the inner surface of the cylinder in a manner to 2~20~2 prevent displacement of the weight with respect to the cylinder surface.
DE 28 49 454 and DE 29 03 784 each disclose a drying cylinder having objects ~ecured to an inner surface thereof. The objects are condensate turbulence producing strips which extend essentially parallel to the axis of rotation of the cylinder. The strips can be pressed ayainst the inner surface of the cylinder by springs, for example. Furthermore, the strips are positioned against ~he cylinder utilizing positioning elementg 90 that the 9trips do not ~hift with respect to the inner surface of the cylinder. The positioning elements are cylinder'pins which are secured ~o the strip and extend into a bore of the cylinder which may be undesirable because any bore made into the cylinder weakens the cylinder wall. A further consideration is that chips produced during the boring operation must be removed, requiring additional manufacturing time and expense when the drying cylinder would otherwise be ready for use. In some instancles, it is not possible ~o form bores inside a cylinder because sufficient space i9 not available.
According to U.S. Patent No. 4,369,586, the head of a siphon for removing condensate is secured to an in3ide wall of a hollow cylinder utilizing screws.
Additional means for securing the siphon head in a selected position to guard against displacement of the ~iphon head with respect to the cylinder wall are not disclosed. Thus, there is a danger that a~ a result of different thermal expansions of the siphon head and the cylinder, th~ screw connection will loosen.
Attempts have been made to secure certain objects, such as balancing weight~, to an inner surface of a cylinder by adhesive bondlng. However, such methods have not been found to be sufficiently reliable, especially when the hollow cylinder i3 a heated drying cylinder. Not even the best adhesives - currently available have exhibited sufficient thermal stability for u~e in a drying cylinder.
2 ~ 2 It i an ob~ct of th~ invontlon to obvi~t~ or ~itigat~ at lea3t one of ~he problem~ described above.
According to one aspect of the invention, a m~thod and device for positioning an obj~ct aga~nst an inner surEace sf a hollow cyli~der and ~ecuring the object thereagainst in a manner to prev@nt displace~ent o~ the object with respect to th~ inn~r ~r~ce includ~
providing a device for po3itioning the object agai~st the inner surface adapted to penetrate the hollow cylinder. The po~itioning device inclu~e~ at least one positioning pin disposed at a side of ~he o~ject. The pin has a sharp projec~ion. Th~s inventive method include~ the step of driving thle sharp projection into the cylinder at the inner surface.
Other objects and adviantage~ of th~ invention will be apparent to those skilled in the art from the following detailed de3cription taken i~ conjunction with ~he drawings and the appended claims.
Pre~erred embodiment~ of the pre~ent invention :~
will now be descri~ed, by way of example only, with referenc~ to the attached Figures, wher~in: :
Fig. 1 is a partially schema~ic sectional view of a device according to the invention.
Fig. 2 i~ a partially schematic ~ectional view o~ a second emhodiment of a devicc according to the in~ention.
Fig. 3 is a partially ~chematic sectional view of a third embodiment of a devic~ according to the invention.
~ ig. 4. i~ a par~ially schematic ~ectional view of a siphon shoe screwed into an inner cylinder wall secured into position by a fourth embodiment of a device according to the invention.
Fig. S is a partially schematic longitudinal sectional view taken along line V-V of Fig. 4 showing 2~ 20962 the fourth embodiment of a device according to the invention.
Fig. 6 is a partially schematic sectional view of an inte~nally ribbed drying cylinder utilizing a fifth embodiment of a device according to the invention.
Fig. 7 is a partially schematic longitudinal sectional view taken along line VII-VII of Fig. 6 showing the fifth embodiment of a device according to the invention.
Fig. 8 is a partially schematic cross-sectional view of a guide roll showing a sixth embodiment of a device~ according to the invention.
Fig. 9 is a partially schematic sectional view of a seventh embodiment of a device according to the invention.
Fig. 10 is a partially schematic longitudinal sectional view of a drying cyliIlder showing an eighth embodiment o~ a device accordin~7 to the invention.
Fig. 11 is a partial cro3s-3ectional view of a hollow cylinder including nin~:h and tenth embodiments of a device according to the invention.
~ device and method according to the 2~ invention reduces the expense typically encountered in mounting an object against an inner surface of a hollow cylinder so that it is positioned securely against the cylinder with any shifting or displacement between the object and the cylinder being kept at a minimum. In various embodiments of the invention, bores need not be made in the inner cylinder wall to provide means for securing the object to the cylinder wall. It has been found that a positioning element or elements preferably having two sharp projections which are driven into the hollow cylinder or shell may be utilized for this purpose. The frictional engagement between the points of the sharp projections and the cylinder wall in combination with a force which presses the object against the wall, securely positions the object against the wall.
212~9~2 Fig. 1 illustrates an embodiment of a device according to the invention wherein an object or part 2 is pressed against an inside wall W of a hollow cylinder or roll shell 1 by a force of a biasing mechanism shown as springs B. A positioning pin 3 having a substantially sharp projection or point 4 i9 substantially disposed in a blind bore 5 of the object 2 with the projection 4 protruding out of the object 2.
According to a method of the invention, the sharp projection 4 is driven into the cylinder 1 at a surface W thereof (i.e. pressed into the cylinder in a non-cutting manner), forming a recess in the cylinder 1, with the projection 4 frictionally engaging the cylinder 1. The steps oE pres~ling the object 2 against the inner ~urface W of the cyli.nder 1 and of driving the sharp projection 4 lnto the inner surface W may be performed simultaneously. The projection 4 preferably ~0 penetrates about 0.25 mm to about 2~5 mm into the cylinder 1.
In Fig. 2, another embodiment of a device according to the inventlon is shown wherein an object 2a is pressed against an inside wall of a hollow cylinder or roll shell la by the force of biasing means shown as springs B. A positioning pin 3a having a substantially sharp projection 4a is substantially disposed in a blind bore 5a of the object 2a with the projection 4a protruding out of the object 2a.
According to a method of the invention, the sharp pro~ection 4a is driven into the cylinder la similarly to what is described herein with respect to Fig. 1.
The pin 3a also includes a shoulder 6a which encircles the projection 4a and i9 shown seated against the inner wall of the cylinder la. The shoulder 6a is substantially perpendicular to an axis of a shaft 7a of ' the pin 3a running through a point of the projection 4a.
With reference to Fig. 3, a third embodiment of a device according to the invention includes elements designated by the reference n~merals lb, ~b, ~11 2~9~2 3b, 4b, and 7b, which substantially correspond in design and function to the elements designated by the reference numerals la, 2a, 3a, 4a, and 7a, respectively, described herein with respect to Fig. 2.
The object 2b has a throughbore 5b. The positioning pin 3b i~ frictionally held again~t walls of the bore 5b by a press fit. In the embodiment of the invention 3hown in Fig. 3, the positioning pin 3b includes an annular groove G disposed in an end surface 6b.
Material that is pressed out of the cylinder lb when the projection 4b is dri~en into the wall of the cylinder lb collects in the groove G. The positioning pin 3b i~ pres3ed in ~r hammered into the cylinder lb from an open end of the bore 5b, using a press or hammer, for example.
Fig. 4 shows a siphon. shoe 9 secured with Rcrews 10 on a hollow cylinder lc. The ~crews 10 extend through throughbores 11 of the ~iphon shoe 9 and are Rcrewed into a threaded bore 12 of the cylind~r lc.
Since there is a clearance between the screws 10 and the throughbore3 11, the sipho~l shoe 9 may shift a distance approximately equal to the 8i2e of this clearance when under the influence of transverse forces, thus loosening the screw~ 10.
However, as 3hown in Fig. 5, ~uch a shift is sub~tantially prevented by utilizing an embodiment of a device according to the invention wherein positioning pin~ 3c ~imilar in design and function to the pins 3 described with re3pect to Fig. 1 are di~posed in the shoe 9. The pins 3c are substantially disposed in blind bores 5c of the shoe 9 and are each seated against a wall defining an end or base of the bore 5c.
Projections 4c of the pins 3c are driven into the cylinder lc. A~ a result, the siphon sho~ 9 i5 fixed in a position and secured against rotation with respect to the cylinder lc.
Fig~. 6 and 7 illustrate a sub~tantially rectangular conden~ate collecting tube 13 supported on peripheral ri~s 14 of a hollow cylinder ld which can be shifted in a longitudinal direction (i.e. with respect to the length of the cylinder). In order to prevent 2~2~2 migration of the tube 13 in a peripheral direction (i.e. transverse to the longitudinal direction), a two-part guide piece 15 is clamped securely on the inner peripheral ribR 14 of the cylinder wall ld using a3sembly screws 16. A device according ~o the invention includes positioning pins 3d having projections 4d which are inserted into at lea~t one of the two parts of the guide piece 15. When the assembly screws 16 are tightened, the projections 4d of the po~itioning pin3 3 press into the side3 of the peripheral rib~ 14, thereby securing the guide piece 15 to the rib 14 at a selected location. Alternatively, a tool may be utilized to pre-form holes for the projections 4d in a selected location prior to seating the guide pieces 15 on the ribs 14.
Fig. 8 shows balancing weights 17, which are pressed again~t an inner surface of a hollow cylinder le by springs 19 connected to a common holding frame 18. In order to prevent undesirable shifting of the Z0 balancing weights 17 with re~pe!ct to the inner surface of the cylinder le when vibration3 occur, for example, a device according to the invention is provided ha~ing positioning pins 3e with projec:tions 4e which are inserted in the weights 17. The projections 4e are driven into the hollow cylinder le.
Fig. 9 3how~ another embodiment of a device according to the invention. An object or part shown as a balancing weight 2f is pressed against a hollow cylinder lf by a pressing force designated by an axrow F. Two po~itioning pins 3f with conical projections 4f are dispo~ed in throughbores 5f of the weight 2f. The pins 3f each ha~e a length which is shorter than a length of a corresponding throughbore 5f. The conical projections 4f are driven into the cylinder lf. Grain-or chisel cuts 20 are made in the weight 2f near anopening of the bores 5f which cause a portion of a wall defining each bore 5f to defonm, thereby narrowing the bore 5f, the deformed wall contacting the pin 3f and preventing loosening (i.e. axial shifting in the direction of the bore opening) of the pin 3f in the bore 5f.
212~2 With respect to Fig. 9, a method according ~o the invention preferably includes the sequential steps of introducing the pin 3f into the throughbore 5f, pressing the weight 2f against an inner surface of the cylinder lf, driving the pin 3f into the cylinder lf, and axially fixing the pin 3f within the throughbore 5f by deforming a wall defining the throughbore Sf.
In Fig. 10, an object 2g illustrated as a condensate turbulence-producing strip, is shown mounted parallel to an axis of a cylinder lg and pressed by springs l9g thereagainst. Another embodiment of a device according to the invention, illustrated by position:ing pins 3g having projection~ 4g partially disposed in the strip 2g preven.t shifting or rotation of the strip 2g relative to the cylinder lg.
Instead of the sprinss 19, magnet~ may be u~ed to hold the strips 2g against the cylinder lg.
Also, the strips 2g may be composed of magnets, optionally combined with other materials.
Fig. 11 shows two em~)odiments of a devic~
according to the invention, one of which ~hows a strip 2h mounted on a hollow cylinder lh in a direction parallel to an axis of the cylinder lh. The ~trip 2h i9 held at an inside wall of the cylinder 1 by horseshoe magnets 21 which surround the strip 2h. The poles of the hor~eshoe magnets 21 are designated by the numerals N and S. The strip 2h i~ secured to the cylinder lh in a manner substantially preventing di~placement of the strip 2h with respect thereto, by a positioning pin 3h ha~ing a projection 4h. The pin 3h i5 substantially disposed in a throughbore 5h of the strip 2h. The projection 4h can be conical or wedge-shaped and i3 driven into the cylinder lh.
¦ Instead of a positioning pin 3h, a positioning ~crew (not shown) having a wedge-~haped projection can be provided which i9 ~crewed into the ~trip 2h. When the wedge-shaped projection i8 driven into the cylinder lh according to a method of the invention, the ~crew cannot un3crew from the thread, i.e., the wedge-shaped point ensures that the positioning screw does not turn.
2~2~9~2 g Fig. 11 shows another embodiment of a device according to the invention wherein strips 2i made from rod-shaped magnets aligned behind one another are held within a track 22. Positioning pins 3i are substantially disposed in the strips 2i. Each of the pins 3i includes a projection 4i which i9 driven into the hollow cylinder lh.
With respect to all of the embodiments of devices according to the in~ention described herein, the positioning pins (or at least the projections of the positioning pins)~are made of material that i9 harder than the material of the hollow cylinder, or the projection3 are other~ise hardened so that they can be driven easily into the relatively soft material of the cylinder. Also, projections may be formed on the positioning pins and then the projections hardened to result in a driving point which i9 harder than the material of the hollow cylinder.
The foregoirlg detailed description is given for clearness of under3tanding only, and no unnecessary limitations should be understood therefrom, as modifications within the scope of the invention will be apparent to those skilled in the art.
Claims (17)
1. A method for positioning and securing an object against an inner surface of a hollow cylinder to prevent displacement of the object with respect to the inner surface, the method comprising the step of providing means for positioning the object against the inner surface wherein said positioning means is adapted to penetrate the hollow cylinder, said positioning means comprising at least one positioning pin disposed at a side of the object, said pin having a sharp projection, said method including the step of driving the sharp projection into the cylinder at the inner surface.
2. The method of claim 1 wherein the positioning pin is disposed at least partially within the object.
3. The method of claim 1 comprising the simultaneous steps of pressing the object against the inner surface and driving the sharp projection into the inner surface.
4. The method of claim 2 wherein the object has at least one throughbore and comprising the sequential steps of introducing the pin into the throughbore, pressing the object against the inner surface of the cylinder, driving the pin into the cylinder, and axially fixing the pin within the throughbore.
5. A device for positioning and securing an object against an inner surface of a hollow cylinder to prevent displacement of the object with respect to the inner surface, said device comprising means for positioning the object against the inner surface adapted to penetrate the hollow cylinder, the positioning means comprising at least one sharp projection disposed at a side of the object facing the inner surface, said sharp projection disposed in a recess in the cylinder wherein the recess is formed by driving the sharp projection into the cylinder at the inner surface.
6. The device of claim 5 wherein the positioning means comprises at least one positioning pin disposed at least partially within the object, the pin having a sharp projection.
7. The device of claim 5 wherein the sharp projection is made from a material having a greater hardness than the hollow cylinder material.
8. The device of claim 5 wherein the sharp projection penetrates about 0.25 mm to about 2.5 mm into the cylinder.
9. The device of claim 6 wherein the object has at least one bore having a wall and the positioning pin is at least partially disposed in the bore and press fit against a wall defining the bore.
10. The device of claim 9 wherein the bore is a blind bore.
11. The device of claim 9 wherein the bore is a throughbore.
12. The device of claim 11 wherein the positioning pin is shorter than a corresponding throughbore and the pin is fixed axially therewithin.
13. The device of claim 12 wherein the pin is axially fixed to the object by deforming a portion of the wall defining the bore.
14. The device of claim 10 wherein the positioning pin is disposed against a wall defining a base of the blind bore.
15. The device of claim 6 wherein each positioning pin has an end surface encircling the sharp projection.
16. The device of claim 5 wherein the sharp projection is wedge-shaped.
17. The device of claim 5 wherein the sharp projection is pyramid-shaped.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4311936.0 | 1993-04-10 | ||
| DE19934311936 DE4311936A1 (en) | 1993-04-10 | 1993-04-10 | Balancing weight positioning system for roller, drum or cylinder casing - using hard positioning pins with pointed ends for penetrating material of cylinder inside wall around central support. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2120962A1 true CA2120962A1 (en) | 1994-10-11 |
Family
ID=6485299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2120962 Abandoned CA2120962A1 (en) | 1993-04-10 | 1994-04-11 | Method and device for securing an object against an inner surface of a hollow cylinder |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0623702A3 (en) |
| JP (1) | JPH0727480A (en) |
| CA (1) | CA2120962A1 (en) |
| DE (1) | DE4311936A1 (en) |
| FI (1) | FI941630A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102686797A (en) * | 2009-11-05 | 2012-09-19 | 沃依特专利有限责任公司 | Device and method for producing a material web |
| CN109681538A (en) * | 2019-01-22 | 2019-04-26 | 浙江正泰新能源开发有限公司 | Tracker transmission shaft connecting structure |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4311936A1 (en) * | 1993-04-10 | 1993-10-07 | J M Voith Ag St Poelten | Balancing weight positioning system for roller, drum or cylinder casing - using hard positioning pins with pointed ends for penetrating material of cylinder inside wall around central support. |
| DE102009001593A1 (en) * | 2009-03-17 | 2010-09-23 | Voith Patent Gmbh | Steam-heated drying cylinder with internal strips to increase the heat output |
| CN104190751B (en) * | 2014-08-13 | 2016-06-08 | 崇州广益机械制造有限公司 | A kind of for correct rotating roller body flexible deformation and with the device of equilibrator |
| CN104190749B (en) * | 2014-08-13 | 2016-06-08 | 崇州广益机械制造有限公司 | Rotating roller body flexible deformation's correction device |
| CN104174710B (en) * | 2014-08-13 | 2017-05-17 | 林文财 | Roller body flexibility correction device with balancing device |
| CN104190756B (en) * | 2014-08-13 | 2017-08-04 | 江苏沃林胶辊机械有限公司 | Roll body flexible deformation's means for correcting |
| CN104502021A (en) * | 2014-12-31 | 2015-04-08 | 北京航空航天大学 | Static/dynamic balance adjusting structure of centrifugal machine |
| CN109540458B (en) * | 2018-10-31 | 2021-06-11 | 中国航天空气动力技术研究院 | Variable mass counterweight in thin tube and mass adjusting method |
| CN109707793B (en) * | 2019-01-15 | 2020-06-26 | 合肥工业大学 | Center of mass self-calibration inertia flywheel device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE390330B (en) * | 1975-04-28 | 1976-12-13 | Stal Laval Turbin Ab | METHOD OF PLACING AND FIXING BALANCE FAILURES IN A SALMON TAIL PAIR IN A ROTOR AND TOOL FOR PERFORMING THIS METHOD |
| DE2849454C2 (en) * | 1978-11-15 | 1980-07-24 | J.M. Voith Gmbh, 7920 Heidenheim | Cylinders, in particular drying cylinders for paper machines |
| US4195417A (en) * | 1979-01-19 | 1980-04-01 | Beloit Corporation | Dryer drum with magnetic spoiler bars |
| DE4311936A1 (en) * | 1993-04-10 | 1993-10-07 | J M Voith Ag St Poelten | Balancing weight positioning system for roller, drum or cylinder casing - using hard positioning pins with pointed ends for penetrating material of cylinder inside wall around central support. |
-
1993
- 1993-04-10 DE DE19934311936 patent/DE4311936A1/en not_active Withdrawn
-
1994
- 1994-03-19 EP EP94104375A patent/EP0623702A3/en not_active Withdrawn
- 1994-04-08 FI FI941630A patent/FI941630A/en unknown
- 1994-04-11 CA CA 2120962 patent/CA2120962A1/en not_active Abandoned
- 1994-04-11 JP JP7224894A patent/JPH0727480A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102686797A (en) * | 2009-11-05 | 2012-09-19 | 沃依特专利有限责任公司 | Device and method for producing a material web |
| CN109681538A (en) * | 2019-01-22 | 2019-04-26 | 浙江正泰新能源开发有限公司 | Tracker transmission shaft connecting structure |
| CN109681538B (en) * | 2019-01-22 | 2024-04-19 | 浙江正泰新能源开发有限公司 | Tracker transmission shaft connection structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0727480A (en) | 1995-01-27 |
| FI941630A0 (en) | 1994-04-08 |
| DE4311936A1 (en) | 1993-10-07 |
| FI941630A (en) | 1994-10-11 |
| EP0623702A3 (en) | 1995-02-15 |
| EP0623702A2 (en) | 1994-11-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19970411 |