Classifications

• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B3/00—Ohmic-resistance heating
  • H05B3/40—Heating elements having the shape of rods or tubes
  • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/72—Heating or cooling
  • B29C45/74—Heating or cooling of the injection unit
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/20—Injection nozzles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/17—Component parts, details or accessories; Auxiliary operations
  • B29C45/20—Injection nozzles
  • B29C45/24—Cleaning equipment

Definitions

• the invention relates to a surface heating element with an electrical resistance heater for tool and machine parts, with an annular outer shell, an inner part and the heating conductor or heating conductors provided between the inner part and the outer shell.
• a ring-shaped, known surface heating element has a heat protection jacket, which consists of two articulated segment shells, is equipped on the inside with a wave-shaped reflector and covers heating tapes on the outside, which are drawn onto a ring that is directed towards it heating machine part can be put on.
• the overall structure of this surface heating element is very complex and its service life is short, since the heated tapes can come into contact with the atmospheric oxygen, which results in scaling, which results in wear of the heating tapes.
• the invention has for its object to design a surface heater of the type mentioned in such a way that the heating conductor marge ⁇ based wear and erosion is freely disposed in the heating element, the heating element with a long lifespan 'provides a highly Schule Itemize and in a simple manner to be heated Tool and machine parts can be adapted.
• each heating conductor enclosed with a thin insulating layer is arranged without play in a receptacle delimited by two components of the heating element and the receptacle is sealed gas and liquid-tight from the atmosphere.
• the receptacle for the heating conductor is limited by the outer shell and by the inner part. This results in a surface heating element with small dimensions. So that the heating conductor, which is located in the receptacle without play, remains firmly clamped between the outer shell and the inner part even during operation, a metal is selected for the outer shell whose coefficient of expansion is less than or equal to the coefficient of expansion of the inner part.
• the outer shell and the inner part can form several receptacles for the heating conductors lying side by side. It is also possible to provide one or more ring-shaped intermediate parts between the outer shell and the inner part, so that each of the outer shell and the adjacent ring-shaped intermediate part and / or of two ring-shaped intermediate parts and / or of an annular intermediate part and the inner part one or more receptacles for heating conductors lying next to one another are limited.
• the gas- and liquid-tight sealing of the receptacles of the heating conductors from the atmosphere can be achieved by welding the connecting surfaces of the components delimiting the receptacle in the outer region of the heating element.
• the firm clamping of the heating conductors in the receptacles delimited by the components of the heating element and the prevention of the penetration, in particular, of atmospheric oxygen into the receptacles means that the mechanical wear of the heating conductors and the wear due to corrosion are kept small.
• FIG. 1 shows a ring-shaped surface heating element with a power connection running parallel to the longitudinal axis of the heating element, partly in section
• FIG. 2 shows the heating element corresponding to FIG. 1 with an obliquely running power connection on average
• FIG. 3 shows a machine nozzle with a heating element attached Section
• Fig. 4 is a partial view of a plastic injection molding machine with a heated portafilter in section
• Fig. 5 is a machine nozzle of a zinc die casting machine with two surface heating elements partially in section.
• the surface heating element 1 consists of an outer shell 2 and an annular inner part 3, the form-fitting auf ⁇ basic engage a stepped formation and one in the "Quer ⁇ cut circular seating 4 for a heat conductor 5 limit provided by electrical Is enclosed insulating layer 6, which can be made of ceramic and has a thickness of 0.1 to 0.5 mm Together with this insulating layer, the heating conductor 5 is arranged in the receiving channel without play.
• weld seams 9, 10 are provided, by means of which the receptacles 4 for the heating conductors 5 are closed in a liquid-tight and gas-tight manner with respect to the atmosphere.
• the heating conductor 5 is led out at one point of the heating element, by a Enclosed insulating sleeve 11, which is inserted into a sleeve 12, which in turn is welded to the outer shell or to the inner part.
• the power connection consists of a plug socket 13, a connecting adapter: 14, which is fixed to the socket 11 by means of a clamping screw 15.
• the heating conductor 5 as well as the outer shell 2 and the inner part 3 can be heated up to red heat. Before this, the inner part 3 is placed on the machine part to be heated.
• the embodiment according to FIG. 2 differs from that according to FIG. 1 only in the inclined current connection.
• the remote from the power connection end of the heating conductor can be guided out of the heating element and fertil with an electrical connection to the education of the circuit to be provided or it may be the outer shell or * the inner ring is welded, so that the power supply has to go to ground.
• the annular inner part 3 can be machined to adapt to the machine part 1 to be heated in order to enlarge the inner diameter.
• the inner part can also be disc-shaped, so that the heating element can be screwed flat onto the areas of a tool or a machine to be heated.
• the inner part of the heating element is a functional part of the machine.
• the machine nozzle 16 of an injection molding machine forms the inner part of the heating element, the outer shell 2 being fixedly connected to the machine nozzle, for example by a weld seam 17.
• the heating conductor is clamped with the insulating layer without play.
• the inner part of the surface heating element is formed by a sieve carrier 18, to which the plasticized plastic granulate is fed in a plastic injection molding machine 19 through a channel 20 by means of a piston screw (not shown).
• the plastic mass emerging from the filter holder is fed in the direction of arrow 21 to the machine nozzle.
• the outer shell 22 has a ring of push-through bores 26 for fastening screws with which the heating element is fixed on the machine. Between two adjacent through holes of this ring, the heating conductor 5 is led to the power connection 27 and extends in this area through a sleeve 28 made of an electrical insulating material.
• the machine nozzle 29 of a zinc die casting machine which is shown partly in section, is equipped with two surface heating elements 30 and 31.
• the inner ring 32 of the heating element 30 is provided with a conical bore and is placed on the conical front end 33 of the machine nozzle.
• the heating element 31 circumscribes a cylindrical part 34 of the machine nozzle.
• the inner rings of the heating elements can be easily adapted to the machine nozzle, since the inner rings can be machined.
• the surface heating elements 30 and 31 have the additional function of mechanically stiffening the machine nozzle, so that load forces can be transferred from the machine nozzle to these heating elements.

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)
• Resistance Heating (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)
• Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
• Press Drives And Press Lines (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6332023

Family Applications (1)

Country Status (14)

Families Citing this family (4)

Family Cites Families (14)

• 1987
  • 1987-07-21 DE DE19873724088 patent/DE3724088A1/de not_active Withdrawn
• 1988
  • 1988-06-23 WO PCT/DE1988/000376 patent/WO1989000803A1/de not_active Ceased
  • 1988-06-23 US US07/331,661 patent/US5051563A/en not_active Expired - Fee Related
  • 1988-06-23 RU SU884613818A patent/RU1838897C/ru active
  • 1988-06-23 AU AU19495/88A patent/AU603238B2/en not_active Ceased
  • 1988-06-23 KR KR1019890700500A patent/KR890702408A/ko not_active Withdrawn
  • 1988-06-23 JP JP63505045A patent/JPH02500145A/ja active Pending
  • 1988-06-23 BR BR888807137A patent/BR8807137A/pt not_active IP Right Cessation
  • 1988-06-23 EP EP88905358A patent/EP0325625A1/de not_active Withdrawn
  • 1988-07-19 DD DD88318083A patent/DD273541A5/de not_active IP Right Cessation
  • 1988-07-20 YU YU01409/88A patent/YU140988A/xx unknown
  • 1988-07-20 ES ES8802289A patent/ES2007968A6/es not_active Expired
  • 1988-07-20 CA CA000572483A patent/CA1291197C/en not_active Expired - Lifetime
• 1989
  • 1989-02-28 DK DK094189A patent/DK94189A/da not_active Application Discontinuation

Non-Patent Citations (1)

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