FIELD OF THE INVENTION
The present disclosure generally relates to an optical element holding apparatus for holding an optical element and, in particular, to apparatus and method of using optical target glass holder with larger diameter heat exchanger. Also, the present disclosure relates to an apparatus used for hollow shell and tube heat exchanger with circular cross section.
BACKGROUND OF THE INVENTION
Background description includes information that may be useful in understanding the present subject matter. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed subject matter, or that any publication specifically or implicitly referenced is prior art.
In shell and tube heat exchanger, the cylindrical hollow shell is an integral part that holds all the tubes, support structures, various nozzles. The shells are used both as structural part and also as pressure boundary of heat exchanger. The shells are subdivided in to various sub shells of various diameter and length for the ease of manufacturing and handling. Reference axis is to be established on these shells for co-centric matching with other shells and also for fabrication of nozzles and lugs in the shell itself.
The shells are supported internally with a hub and rim pad structures in the ID to avoid deflection during handling. The apparatus is fixed on the center of the hub plate. The apparatus is incepted and developed to locate, adjust and fix the center and axis of shell.

As an example of the prior art, US Pat. No: US4088396A discloses an optical mount enabling independent orthogonal adjustment of the angular position of an optical element comprises a cell adapted to receive an optical element and a base defining a chamber open on one side thereof for receipt of at least a part of the cell therein. The cell comprises a circumferentially extending partial spherical section and a pair of portions extending outwardly of the spherical section, and the base comprises an angular seat on the open side receiving and conforming to at least a portion of the spherical section of the cell and a pair of portions extending outwardly of the seat and facing the cell portions. A pair of independent adjustable means spaced from each other by substantially 90° are secured to one of the portion pairs for movement therewith and have parts adapted to operatively abut against aligned sections of the other of the portion pairs. The parts of the adjustable means and the corresponding aligned sections of the other portion pair are biased towards each other. The cell is pivotable orthogonally about axes passing through the geometric center thereof, without cross-coupling by independent adjustment of the adjustable means.
Existing prior art such as EP1312965B1 relates to an optical element holding device comprises a holding unit for holding the flange portion of an optical element. The holding unit includes a bearing surface block having a bearing surface in contact with the flange portion and a bearing surface block supporting mechanism for supporting the bearing surface block turnably on an axis (Y) in the tangential direction of the optical element. By this construction, the optical element is kinematically held by the optical element holding device thereby to keep a satisfactory image-forming performance of the optical element.

Another example US6930842B2 disclose an optical element holding device includes a ring body for accommodating an optical element and a drive mechanism for driving the optical element. The ring body has an inner ring portion, which engages with a peripheral edge of the optical element, and an outer ring portion integral with the inner ring portion. The drive mechanism includes an actuator, a displacement increasing mechanism and a guide mechanism. The guide mechanism transfers displacement of the actuator to the inner ring and moves the inner ring axially.
For example US8854602B2 disclose a holding device for an optical element in an objective has a mount that is connected to the objective, on the one hand, and at least indirectly to the optical element, on the other hand. Arranged between the mount and the optical element is a reinforcing element whose coefficient of thermal expansion corresponds substantially to the coefficient of thermal expansion of the optical element.
Thus, there remains a need for method and apparatus using optical target glass holder in the manufacturing of larger diameter heat exchanger. Also there remains a need for apparatus to establish the two perpendicular axis and reference center point along of the shell. There remains a need for the method to be employed for permanent marking of reference center to proceed for concentric fit-up with next shell.

OBJECTS OF THE INVENTION
In view of the foregoing limitations inherent in the state of the art, some of the objects of the present disclosure, which at least one embodiment herein satisfy, are listed herein below.
It is an object of the present disclosure to propose an optical holding apparatus for holding a heat exchanger shell enabling a rapid movement and handling of the shell.
It is another object of the present disclosure to manufacture a portable apparatus to easily establish optical alignment of circular cross section shell, preferably with hemispherical structure.
It is yet another object of the present disclosure to optimize a job setting time during the shell positioning
It is still yet another object of the present disclosure to overcome axis mis-alignment and to establish a thermally and mechanically stable process.
These and other objects and advantages of the present invention will be apparent to those skilled in the art after a consideration of the following detailed description taken in conjunction with the accompanying drawings in which a preferred form of the present invention is illustrated.
SUMMARY OF THE INVENTION
This summary is provided to introduce concepts related to an apparatus and method of using optical target glass holder in the manufacturing of larger diameter

heat exchanger. The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
The present disclosure relates to an optical element holding apparatus comprises a holding portion to hold a heat exchanger shell, wherein the holding portion includes a plurality of hollow circular shells welded to form an outer structure, a target holder fixing plate is placed in co-centric with a drawn hub circle and are fastened using hexagonal screws and a hexagonal nut. A rim and hub pad assembly wherein an ovality is configured to achieve maximum possibility and a reference center point is established before any operation. An outer frame and an inner frame locked by fasteners. Any fastening means is configured in the outer frame to adjust the position and a center point is tracked using a telescopic lenses and adjusted. The center point is fixed to lock the heat exchanger shell and subsequent manufacturing operations are carried out using the reference center point.
The present disclosure relates to a method of using optical element holding apparatus in the manufacturing of heat exchanger, comprising the steps of: positioning a holding portion to hold a heat exchanger shell, wherein the holding portion includes: welding a plurality of hollow circular shells to form an outer structure, placing a target holder fixing plate in co-centric with a drawn hub circle and fastening using hexagonal screws and a hexagonal nut. Configuring a rim and hub pad assembly wherein achieving an ovality to maximum possibility and establishing a reference center point before any operation. Locking an outer frame

and an inner frame using fasteners. Configuring a fastening means in the outer frame for adjusting the position. Tracking a center point using a telescopic lenses and adjusting and fixing the center point for locking the heat exchanger shell and carrying out subsequent manufacturing operations using the reference center point.
In an aspect, the apparatus further comprising the optical glass target holder which is fixed and removed using a two slots. Two locking plates on the inner frame to ensure that the optical target glass holder is held in position and prevent without falling down during handling.
In this aspect the adjustment of the inner frame is from all four perpendicular directions which reduces manual intervention of adjusting the center point of heat exchanger shell.
In an aspect the arrangement in horizontal and vertical position with the datum is positioned due to locking arrangement using a hexagonal socket head screw and a slotted cheese head screw.
Other objects, features and advantages of the present disclosure will become apparent from the following detailed description. It should be understood, however, that the detailed description and the specific examples, while indicating specific embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
While the specification concludes with claims particularly pointing out and distinctly
claiming the subject matter that is regarded as forming the present subject matter,
it is believed that the present disclosure will be better understood from the following
description taken in conjunction with the accompanying drawings, where like
reference numerals designate like structural and other elements, in which:
FIG. 1 shows schematic structural view showing an assembly stage components of
a optical target glass holder in an embodiment of the present invention;
FIG. 2 shows an isometric view of an optical element holding apparatus in an
embodiment of the present invention;
FIG. 3 shows an outer frame of the optical element holding apparatus in an embodiment of the present invention;
FIG. 4 shows an inner frame of the optical element holding apparatus with the
optical target glass holder and locking arrangement in an embodiment of the
present invention; and
FIG. 5 shows cross sectional view of the optical element holding apparatus in an
embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The detailed description of various exemplary embodiments of the disclosure is described herein with reference to the accompanying drawings. It should be noted that the embodiments are described herein in such details as to clearly communicate the disclosure. However, the amount of details provided herein is not intended to limit the anticipated variations of embodiments; on the contrary, the

intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the present disclosure as defined by the appended claims.
It is also to be understood that various arrangements may be devised that, although not explicitly described or shown herein, embody the principles of the present disclosure. Moreover, all statements herein reciting principles, aspects, and embodiments of the present disclosure, as well as specific examples, are intended to encompass equivalents thereof.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a”, “an”, and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises”, “comprising”, “includes”, “consisting” and/or “including” when used herein, specify the presence of stated features, integers, steps, operations, elements and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof.
It should also be noted that in some alternative implementations, the functions/acts noted may occur out of the order noted in the figures. For example, two figures shown in succession may, in fact, be executed concurrently or may sometimes be executed in the reverse order, depending upon the functionality/acts involved.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which example embodiments belong. It will be further understood that

terms, e.g., those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Embodiments explained herein pertain to an apparatus and method of using optical target glass holder 06 in the manufacturing of larger diameter heat exchanger shell 01. FIG. 1 shows schematic structural view showing an assembly stage components of a optical target glass holder 06 in an embodiment of the present invention. The heat exchanger shell 01 is having variable large diameter. FIG. 1 shows the full assembly where the heat exchanger shell 01 which is hollow circular in shape, a hub and rim pad assembly 02 along with the target holder fixing plate 03. The optical target glass holder 06 is fixed by fastening means such as hexagonal screw 13 with the measurement of M8*40 and hexagonal nut 14 (M8).
As can be appreciated by those skilled in the art, in shell and tube heat exchanger especially with larger diameter heat exchanger, multiple hollow circular shells are welded to form the outer structure. These shells have to be matched co-centrically with the other shell or components. Hence a reference center point is established on them before start of any subsequent manufacturing activities.
FIG. 2 shows an isometric view of an optical element holding apparatus 100 in an embodiment of the present invention. The method using optical target glass holder 06 on the center of the job to hold hollow heat exchanger shell 01 with axis marking. The optical element holding apparatus 100 to hold the hollow heat exchanger shell

01 is similar to portable target glass holder. The optical element holding apparatus 100 further comprises a hub and with multiple pad rim 02 assay/ structure to be fitted in the ID of the heat exchanger shell 01. Then the optical element holding apparatus 100 is fitted with its outer frame 04 to the central hub plate 08 using four hexagonal head screws. An inner frame 05 of the optical element holding apparatus 100 that holds the target glass is placed inside the outer frame 04. There are four tapped holes orthogonally apart in the outer frame 04 periphery. These holes help to support and adjust the square shaped inner frame 05 using screws. There are guiding slots in all the four peripheral sides of the inner frame 05. These slots are used by four hexagonal socket head screws and washers 07. The fixing process renders both weight balancing and precise alignment of the inner frame 05 holder from all four directions. The arrangement in horizontal and vertical position with the datum is positioned due to locking arrangement using a hexagonal socket head screws 10 and a slotted cheese head screw 11. Slots to be locked upon using slotted grub screw 12. The sheet 09 is measuring 1.5mm* 8* 10.
FIG. 3 shows an outer frame 04 of the optical element holding apparatus 100 in an embodiment of the present invention. The outer frame 04 which is having a square cross section, constitutes the base frame. This frame has four holes in its periphery to fix four hexagonal socket head screws (10).
FIG. 4 shows an inner frame 05 of the optical element holding apparatus 100 with the optical target glass holder 06 and locking arrangement in an embodiment of the present invention. The inner frame 05 is placed inside the outer frame 04. The target holder fixing plate 03 holds the target/optical glass and it is locked using lock

sheet 09 and hexagonal socket head cap screw 10. The apparatus 100 is configured with two opened slots for easy manual handling to place and remove the target glass using fingers. In the inner frame 05, there are open slots in all its four peripheries. These slots enable central hub plate 08 to be locked upon using slotted grub screw 12. This arrangement helps to guide and take reaction force through hexagonal socket head cap screw 10. Washers 07 are placed in the slot to increase surface contact area and act as self-guiding mechanism inside the slots.
FIG. 5 shows cross sectional view of the optical element holding apparatus 100 in an embodiment of the present invention. Prior to fixing the target holder fixing plate 03, the rim and hub pad assembly 02 is tightened in the ID of the heat exchanger shell 01 to inherent ovality and corrected to the maximum extent. After this an approximate center is established using trammel method. Once the approximate center is found, then a circle of 160 mm diameter is drawn of the hub plate. The target holder fixing plate 03 is placed in co-centric with the drawn hub circle and are fastened using four hexagonal screws 13 and hexagonal nut 14. Once the heat exchanger shell 01 is placed, hexagonal socket head cap screw 10, the inner frame 05 could be precisely adjusted in both the perpendicular axis. The central hub plate 08 to be locked upon is fitted using the slotted grub screw 12.
In a preferred embodiment a base plate in the outer frame 04 which provides the support for the heat exchanger shell 01 with larger diameter to fit with the hub using fasteners. Varying the heat exchanger shell 01 diameter and the optical glass holder 06 diameter for which the outer frame 04 and the inner frame 05 modified accordingly.

In one embodiment the heat exchanger shell 01 is with variable and large diameter. The fastening means is selected from a screw, a washer a nut or a bolt. The optical glass target holder 06 fixed. The threaded holes with socket head cap screw 10 attached in the peripheries of the outer frame 04. The adjustment of the inner frame 05 is from all four perpendicular directions which reduces manual intervention of adjusting the center point of heat exchanger shell 01. The two locking plates on the inner frame 05 to ensure that the optical target glass holder 06 is held in position and prevent without falling down during handling. Two another slots easily locate and remove the optical target glass holder 06 in the inner frame 05. The washer 07 is in the measurement of M6*OD12mm and the central hub plate 08 configuration is 6mm*10*60. The apparatus 100 is configured using the list of components listed below and its quantity is mentioned in the table.


TECHNICAL ADVANTAGE
The present disclosure proposes an apparatus for using optical target glass holder in the manufacturing process of larger diameter heat exchanger.
The present disclosure proposes the method and apparatus allows adaptability of a device for shell for hemispherical dished end, of different diameter and length.
Furthermore, each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the “invention” may in some cases refer to certain specific embodiments only. In other cases, it will be recognized that references to the “invention” will refer to subject matter recited in one or more, but not necessarily all, of the claims.
Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.

Furthermore, those skilled in the art can appreciate that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.
The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.
While the foregoing describes various embodiments of the present disclosure, other and further embodiments of the present disclosure may be devised without departing from the basic scope thereof. The scope of the present disclosure is determined by the claims that follow. The present disclosure is not limited to the described embodiments, versions or examples, which are included to enable a person having ordinary skill in the art to make and use the invention when combined with information and knowledge available to the person having ordinary skill in the art.

WE CLAIM:
1. An optical element holding apparatus (100) comprising:
a holding portion to hold a heat exchanger shell (01) , wherein the holding portion includes:
a plurality of hollow circular shells welded to form an outer structure, a target holder fixing plate (03) is placed in co-centric with a drawn hub circle and are fastened using hexagonal screws (13) and a hexagonal nut (14); a rim and hub pad assembly (02) wherein an ovality is configured to achieve a highest probable reference center point;
an outer frame (04) and an inner frame (05) locked by fasteners; fastening means configured in the outer frame to adjust the position; wherein a center point is tracked using and adjusting a telescopic lense; wherein the center point is fixed to lock the heat exchanger shell (01) for carrying – out subsequent manufacturing operations based on the reference center point.
2. The apparatus as claimed in claim 1, wherein the heat exchanger shell (01) is formed with variable diameter.
3. The apparatus as claimed in claim 1, wherein the fastening means is selected from a screw, a nut or a bolt.
4. The apparatus as claimed in claim 1, wherein the optical glass target holder (06) is fixed and removed using at least two slots.

5. The apparatus as claimed in claim 1, comprising threaded holes with screws (10) attached on the peripheries of the outer frame (04).
6. The apparatus as claimed in claim 1, wherein the adjustment of the inner frame (05) is made from all four perpendicular directions, which reduces manual intervention of adjusting the center point of the heat exchanger shell (01).
7. The apparatus as claimed in claim 1, comprising two locking plates on the inner frame (05) to ensure that the optical target glass holder (06) is held in position and prevent without falling down during handling.
8. The apparatus as claimed in claim 1, comprising two additional slots to easily locate and remove the optical target glass holder (06) in the inner frame (05).
9. The apparatus as claimed in claim 1, comprising a base plate in the outer frame (04) which provides the support for the heat exchanger shell (01) with larger diameter to fit with the hub using fasteners.
10.The apparatus as claimed in claim 1, wherein varying the diameter of the heat exchanger shell (01) and the optical glass holder (06) is possible with corresponding modification of the outer frame (04) and the inner frame (05).

11.The apparatus as claimed in claim 1, wherein positioning of the shell in horizontal and vertical position with the datum is possible due to locking arrangement using a hexagonal socket head screws (10) and a slotted cheese head screw (11).
12.A method of using optical element holding apparatus (100) in the manufacturing of a heat exchanger, comprising the steps of:
positioning a holding portion of the apparatus to hold a heat exchanger shell (01), wherein the holding portion includes:
welding a plurality of hollow circular shells to form an outer structure, placing a target holder fixing plate (03) in co-centric with a drawn hub circle and fastening using hexagonal screws (13) and a hexagonal nut (14);
configuring a rim and hub pad assembly (02) wherein an ovality of a highest possible reference center point is determined before subsequent operation; locking an outer frame (04) and an inner frame (05) using fasteners; configuring a fastening means in the outer frame for adjusting the position; wherein
tracking a center point using and adjusting a telescopic lenses; and fixing the center point for locking the heat exchanger shell (01) and carrying out subsequent manufacturing operations using the determined reference center point.