Classifications

• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B9/00—Blowing glass; Production of hollow glass articles
  • C03B9/13—Blowing glass; Production of hollow glass articles in gob feeder machines
  • C03B9/193—Blowing glass; Production of hollow glass articles in gob feeder machines in "press-and-blow" machines
  • C03B9/1932—Details of such machines, e.g. plungers or plunger mechanisms for the press-and-blow machine, cooling of plungers
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B9/00—Blowing glass; Production of hollow glass articles
  • C03B9/13—Blowing glass; Production of hollow glass articles in gob feeder machines
  • C03B9/193—Blowing glass; Production of hollow glass articles in gob feeder machines in "press-and-blow" machines
  • C03B9/1932—Details of such machines, e.g. plungers or plunger mechanisms for the press-and-blow machine, cooling of plungers
  • C03B9/1934—Mechanical displacement means of the plunger

Definitions

• the invention concerns a positioner sleeve of the plunger of the pressing mechanism of the IS machines used for the forming of parisons of glass packages.
• the sleeve includes a sleeve body, provided with a flange on its open upper end and with a crossbar situated on the lower open end and fitted with a through-pass hole intended for the piston rod of the pressing mechanism.
• the crossbar with the through-pass hole thus form a part of the sleeve bottom.
• the plunger positioner sleeve for the IS machines serves for the lifting of the plunger, with the help of a spring in the pressing mechanism, to the filling position of the plunger.
• the plunger is a part of the mould device and serves for the forming of a glass blank - a parison of the packaging glass (glassware), e.g. a preserve jar.
• the filling position of the plunger is the position of the plunger in the front mould in which a drop of the full-hot glass melting falls onto the tip of the plunger before the forming of the blank. After the end of the forming process, the plunger goes down and presses the sleeve with the spring to the lower position of the plunger.
• the sleeve with the plunger will lift up again with the help of the compressed spring to the filling position.
• the working process repeats this way continuously before the drop falls, several times per minute, e.g. approx. 6 - 20 times per minute, according to the product size and machine work rate.
• the sleeves are made of steel and are cinematically loaded by regular impacts of the plunger during the plunger movement downwards, through the filling position pipe which is inserted into the sleeve onto its bottom.
• the height of the pipe of the filling position is different, according to the type and size of the glass product.
• the number of the plunger impacts is given by the IS machine work rate, as provided for above.
• the sleeves are subject to tensile and bending loads in a continuous operation by cinematic impacts continually for 24 hours a day. This means that during this operation, the sleeve is subject to both mechanical and thermal loads. For this reason it often happens, in a relatively short time period due to this uninterrupted periodical loading, that the sleeve is damaged by cracking or partial breaking, which may lead up to the falling away of the lower part of the sleeve and thus to its destruction.
• a cracked or partially broken sleeve if retained in the machine work station, produces rejects, which may not be revealed at once and which may only be discovered in the production process after a certain time period, when reject glass packages are found on the station. It is necessary to stop the machine station and to exchange the defective sleeve.
• the machine work station If the sleeve fully breaks off during operation, the machine work station is stuck with glass and it must be stopped as well and the defective sleeve must be replaced.
• the stopping of the machine, exchange of the sleeve and starting up of the machine to the work temperature may represent a time loss of about 30 - 60 minutes.
• the damage of the sleeve and subsequent stopping of the machine work station lead to a worse quality of products, generate rejects and decreases the machine productivity due to failures.
• EP 336 657A deals with a fast-exchange insert into the pressing mechanism for the technology of production of ULF (narrow-neck pressed-and-blown pieces, hereinafter "ULF" only) for the IS machines for production of narrow-neck bottles by using the press-and-blow method in such a way that it can be possible to quickly transform the IS machine from a conventional press-and-blow configuration to a narrow-neck press-and-blow system and vice versa.
• This technology system also uses the plunger positioner sleeve, but of an absolutely different design than the one used for a classical press-and-blow production method.
• the invention need not deal with any problems concerning the cracking of the plunger positioner sleeves - whether for the ULF process or the conventional press-and-blow technology, because these classical sleeves are not used at all for the ULF process.
• EP 347 071 A2 deals with one of the modes of the fast-exchange insert of the pressing mechanism for the ULF technology and new attachment of the cooling pipe for the cooling of the plunger.
• This patent uses also a plunger positioner sleeve in the pressing mechanism in the design for ULF.
• the patent does not mention any problems concerning the cracking of the sleeves or a change in the sleeve shape or a proposal of another design solution of the sleeve.
• the above mentioned inconveniences can be removed or essentially reduced for the plunger positioner sleeve at the pressing mechanism of the IS machines for the forming of front shapes of glass packages according to the present invention.
• the essence of this invention consists in the fact that the body of the sleeve on the lower open end oriented to the flange is terminated at the crossbar level.
• the main advantage of this invention is the fact that the cross-section of the sleeve body markedly increases in the place which is subject to highest mechanical and thermal loads, and this will lead to an increase in the strength of the sleeve and to a decrease in the bending load of the sleeve.
• the termination of the sleeve body can be made in fact in any place of the crossbar, on the lower open end oriented towards the flange.
• the sleeve body on the lower open end oriented towards the flange is terminated at the lower level of the crossbar circumference, whereby the sleeve strength rises. It is also quite advantageous if the sleeve body is provided, on its open circumference of the lower end oriented towards the crossbar and in the area out of the crossbar connection with the lower edge of the sleeve body, at least with one relief recess, preferably with two relief recesses, oriented oppositely. The relief recess contributes to reduction of the weight of the sleeve on condition of maintaining the increased strength of the sleeve.
• the sleeve body is provided with at least one relief hole.
• the relief holes may be arranged along the entire height of the sleeve body and along its entire circumference. Also the relief holes in the sleeve body contribute to reduction of its weight while maintaining the condition of increased strength of the sleeve.
• the sleeve body is provided with at least one relief hole in the area which is situated above the open lower circumference of the body, and this open lower circumference is situated out of the crossbar connection with the lower edge of the sleeve body.
• the location of the sleeve in this specified place of the sleeve body reduces its weight without any risk of reducing its strength.
• At least one relief recess is situated above two oppositely oriented recesses.
• the combination of the relief recess and the relief holes in the specified place ensures a higher reduction of the weight than it is the case in the above mentioned solutions, under the condition of maintaining its strength.
• Fig. 1 Axonometric view of the sleeve
• FIG. 2 Top view of the sleeve
• FIG. 3 A-A section from Fig. 2,
• FIG. 5 Axonometric view of an alternative design of the sleeve
• FIG. 6 Top view of the sleeve from Fig. 5,
• FIG. 9 Axonometric view of an alternative design of the sleeve
• FIG. 10 Top view of the sleeve from Fig. 9,
• FIG. 1 A-A section from Fig. 10 and
• Fig. 1 - 4 illustrates the plunger positioner sleeve of the pressing mechanism of the IS machines for the forming of front shapes of glass packages, which includes the cylindrical body 1 of the sleeve, provided on the open upper end with a ring-type flange 2 and on the lower open end with a crossbar 3 with a through-pass hole 4, intended for the piston rod of the pressing mechanism.
• the sleeve lifts up the plunger into the filling position in the pressing mechanism.
• the flange 2 serves as a precision stop during the movement of the sleeve into the filling position of the plunger.
• the crossbar 3 is a part of the sleeve and serves as a support for the pipe of the filling position of the plunger, and this pipe lifts up the plunger to the filling position.
• the crossbar 3 with a through-pass hole 4 thus actually creates a part of the sleeve bottom.
• Fig. 2 clearly shows, in the view of the sleeve from above, the forming of the crossbar which is approximately of a belt shape and both its opposite ends are interconnected with the body 1 of the sleeve.
• the through-pass hole 4 of the crossbar 3 passes in its centre and features a circular cross section which is extended on the apposite ends with small semicircular cut-outs 5 serving for the exhaust of the cooling air of the plunger around the piston rod.
• the lower contact area of the crossbar 3 is shifted out below the lower level of the crossbar 3, which is clear from Fig. 1 - 4.
• Fig. 3 in the A-A section from Fig. 2 it is possible to see by how much the contact area of the crossbar 3 is shifted out with regard to the body 1 of the sleeve with a clear well-known design solution of the through-pass hole 4 with its cut-outs 5.
• the contact area of the crossbar 3 represents the stop dog 6 of the lower position of the plunger positioner sleeve in the bottom dead centre of the plunger.
• Fig. 4 in the B-B section from Fig. 3, illustrates a shape of the crossbar 3 in its longitudinal section with a through-pass hole 4 and the stop dog 6 of the crossbar 3.
• the cylindrical body 1 of the sleeve is terminated below the level of the lower edge of the crossbar 3, whereby the cross section of the sleeve in the loaded place is increased.
• Fig. 5 - 8 illustrates an alternative design solution of the sleeve, with the cylindrical body 1, ring flange 2, and with regard to the previous example the implementation with a different design solution of the crossbar 3.
• the crossbar 3 features a circular through-pass hole 4 in its centre for the piston rod.
• the crossbar 3 with the central hole 4 features a plate shape whose both ends are firmly connected with the body 1 of the sleeve.
• the stop dog 6 of the crossbar 3 represents a flat area.
• the body 1 of the sleeve on the lower open end oriented towards the flange 2 is only terminated in the lower level of the circumference crossbar 3.
• the cross-section of the sleeve in the thermally and mechanically loaded place of the sleeve will be increased.
• the shape of this type of the crossbar 3 features a shape which is easy to manufacture.
• Fig. 9 - 12 illustrates another alternative design solution of the sleeve, which corresponds to the sleeve from Example 1 and Figures 1 - 4, with the difference that it further contains two relief recesses 7 and four relief holes 8.
• Both the opposite relief recesses 7 are situated on the open lower end of the sleeve oriented towards the crossbar 3, however, in the area outside the connection of crossbar 3 with the lower edge of the body 1 of the sleeve.
• the relief recesses 7 feature the shape of the elliptic cut-out sector on the circumference.
• each relief recess 7 includes two circular relief holes 8 situated in the body of the sleeve, arranged in one line, parallel with the longitudinal axis of the sleeve.
• This implementation represents a significant relief of the sleeve while maintaining its required strength.
• the cylindrical part of the body 1 of the sleeve is extended, unlike the existing state of the art, along the entire length of the sleeve or to the lower plane of the crossbar 3 of the sleeve. This will lead to an essential strengthening of the sleeve in its place which is subject to the highest load. At the same time, this will make it possible to eliminate the bending loads of the sleeve.
• the cylindrical part of the sleeve may feature a relieved recess 7 of any shape in the place where no tensile load of the sleeve occurs, or it may be relieved through the relief holes 8 of various shapes and sizes, under the condition of maintaining its strength.
• the relieved recess 7 may feature also a shape different from the elliptic cut-out, e.g. circular cut-out, rectangular or square shape or another suitable geometric shape, however reaching such a position of the body 1 that it does not endanger the required strength of the sleeve.
• the relief may be resolved also through one or more relief holes 8 along the entire body 1 of the sleeve.
• the relief holes 8 may feature various geometric shapes, e.g. ellipses, etc., which are suitable for both the production process and use. The size and number of the relief holes 8 must be selected in such a way that it shall not reduce the required strength of the sleeve.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Mechanical Engineering (AREA)
• Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
• Automatic Assembly (AREA)
• Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
• Chair Legs, Seat Parts, And Backrests (AREA)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

Country Status (2)

Citations (2)

Family Cites Families (9)

• 2012
  • 2012-09-06 CZ CZ20120607A patent/CZ304122B6/cs not_active IP Right Cessation
• 2013
  • 2013-09-06 WO PCT/CZ2013/000103 patent/WO2014036980A2/en active Application Filing

Patent Citations (2)

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