US3262420A - Coating and oven system including work handling means - Google Patents

Coating and oven system including work handling means Download PDF

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Publication number
US3262420A
US3262420A US267020A US26702063A US3262420A US 3262420 A US3262420 A US 3262420A US 267020 A US267020 A US 267020A US 26702063 A US26702063 A US 26702063A US 3262420 A US3262420 A US 3262420A
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United States
Prior art keywords
oven
carrier
articles
coating
cars
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US267020A
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English (en)
Inventor
Bossi Giovanni
Pasqualini Bruno
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Galvarplast SNC
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Galvarplast SNC
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
    • B05C19/02—Apparatus specially adapted for applying particulate materials to surfaces using fluidised-bed techniques

Definitions

  • the process consists of placing an article into a heated oven for a certain time depending on the size of the article and the desired thickness of the coating after the surface has been preferably treated with a so-called wash primer, dipping the hot article into a fluidized bed for some seconds, drawingit out and putting it into the ovens again for a fraction of a minute-for the time required for the so-called fusion or postheatingand removing it after it has left the post heat oven and has cooled almost completely.
  • the characteristics of the coating operation depend on various factors, such as the temperature and the heat accumulation within the article during the time or times of the stay in the oven or ovens as well as the dipping time, it becomes evident that a treating process with continuously uniform conditions should be observed if a mass produced article is to be coated. Because of this necessity and according to the cycle of the process, the designers of installations suitable for the process constructed semiautomatic or automatic systems, with complete closed circuit conveyor chains which move the article to be coated through one or two tunnel ovens.
  • a bell-shaped oven is used, i.e. the opening equipped with suitable doors, preferably with sliding doors, is placed at the bottom of the oven.
  • the bell-shaped oven is placed above a container which contains the fluidized bed of pulverulent material.
  • the oven and the container are connected with each other by a vertically movable car carrying device, called carrier hereafter, moved up and down between the container and the upper part of the oven and which can be stopped in the middle of the way in order to pick up or to deliver the proper car which bears the articles to be coated and which is placed in horizontal rails at the rolling device.
  • the reciprocating vertical movement of the carrier is mechanical. This movement is achieved by a cylinder with a piston controlled hydraulically which actuates a system of pulleys or sprockets. So, by means of a short piston stroke a long and quick stroke of a rope or chain is achieved which holds the car carrying device.
  • the same hydraulic device which moves the piston for the carrier serves also for moving two other pistons. These pistons are connected with the half-doors forming the closure of the opening at the bottom of the oven.
  • the installation is equipped with a device driven preferably by an electric motor in order to put into oscillation a shaft with a pulley which bears the rope or chain of the carrier with the articles to be coated.
  • the oscillation takes place while the latter are dipped into and immediately after they have been taken out of the fluidized bed.
  • the to and fro motion during dipping is useful in order to make the powder adhere evenly to the surface to be coated, whereas after emerging it serves to remove from the article the surplus powder particles which do not sinter on or melt together. It is of advantage if the installation is equipped with four cars on which the articles to be coated are suspended.
  • rolling devices are provided for the installation, which carry rails of the same kind as those of the carrier. These rails are placed at an elevation equal to that where the rails of the carrier stop half way between the oven and the container- The function of the rolling device is to sup port the cars immediately before and after the heating and coating and to receive them from and deliver them to the carrier which runs up and down between the oven and the fluidized bed of powder.
  • the control system of the installation should be operated by means of three levers, the first one serving for opening and shutting the doors, the second one for moving the carrier and the third one for shaking the carrier and the articles respectively.
  • One workman is able not only to operate the control system of the installation but also to take ofl the coated and cooled articles from the car at the end of the line and to make the uncoated parts ready to be moved into the oven. All this is done during'the preheating itme.
  • the workman himself pushes the car with the uncoated parts thus moving the car with the coated parts out of the carrier. This car rolls onto the rolling device arranged on the other side of the oven.
  • FIG. 1 is a front view partially in section of the apparatus of the present invention
  • FIG. 2 is a detail of a portion of the apparatus of FIG. 1,
  • FIG. 3 is a side view of the structure at the top of the oven in a larger scale
  • FIG. 4 is a side view of the rolling device in a larger scale
  • FIG. 5 is a schematic designation of the loading and unloading of the rolling devices.
  • the installation comprises a container 1 with a fluidized bed'2.
  • the container is put into the ground, preferably in such a way that it lies completely under the floor level 3 of the room in which the installation is mounted.
  • the container is of the common type and the fluidized bed 2 consists of powder which is held in suspension by a bloweralso of the common typewhich is not shown on the drawing.
  • the bellshaped oven 4 is installed which has the opening 5 at the bottom.
  • the opening 5 has two horizontal sliding doors 6 and 7 with hydraulical movement which will be described later.
  • the carrier 9 is suspended on rope or chain 10. This rope or chain leads through the hole 11 in the top of the oven into the interior part of the oven and is fixed at a fixed point 44.
  • the rope or chain .10 winds itself with fii-turn around the pulleys or sprockets 12 and 13 and is controlled by means of the device 14.
  • the device 14 consists of two series of five pulleys or sprockets 14.
  • the latter are mounted on two parallel movable shafts 14 which can be brought towards or away from each other by means of a hydraulic device which is described later on.
  • the rope 16 Winds itself changeably around an upper and a lower pulley or sprocket, thus forming an advantageous system for hoisting or lifting and lowering the carrier 9.
  • the pulley 12 is mounted on the shaft 12' which is borne by two bearings 15. However, this pulley can be moved vertically in the grooves 15' existing therein.
  • the shaft 12 lies on a cam 16 which give the shaft an up and down movement when turned, together with the pulley 12 and the rope or chain 10.
  • the cam 16 is slidably connected with the shaft 12'.
  • a shaft 16 bears the cam 16 and the sprocket 16" which is driven by the chain 17 which again is driven by the sprocket 18 of the motor 19.
  • the motor 19 is connected with the electric power supply 21 by means of the cable 20, between them there is the switch 22 with the corresponding control lever C.
  • the installation is also equipped with a hydraulic device 23 with the pump 23.
  • This pump drives the pistons 24-24 and 25-25.
  • the pump is connected with the valves and 31 by means of the inlets 26 and 27 and the outlets 28 and 29.
  • the valves are equipped with the control levers A and B respectively.
  • Two conduction lines go out from the valve 30; one (32) is connected with the external ends of the cylinders 24 and the other one (33) with the internal ends of the cylinders.
  • the pistons 24 and 24' are placed in the cylinders 24".
  • Each installation has some article holding cars 36 e.g. four on each side of the rolling devices.
  • Each car consists of two opposite arranged frames 46. Between the frames 46 a number of rollers 47 is provided on which with coated articles for cooling.
  • the car is slidably guided in the rails 39' of the rolling device.
  • Connected with the cars is a number of hooks 48 to which the articles 38 can be attached by further hooks 37.
  • the rolling devices 39a, 39b, 39c, 39d (four) form also part of the installation. They consist of two rails 39 which are equal to those 9" of the carrier 9. They are supported by four feet 39 equipped with wheels 45 in order to facilitate the movement over the floor level 3. All rolling devices have the rails in the same height.
  • the sliding of the cars goes on as following: In the carrier there are two cars at which coated articles are hanging. In the rolling device 39a (Pos. I) there are two cars with articles prepared for coating. In the rolling device 39b (Pos. II) there are no cars. In the rolling devices 39c (Pos. III) and 39d (Pos. IV) there are cars In the free spaces between the rolling devices 39b and 39c, 39c and 39d as well as 39d and 39a there are further rolling devices provided which have been left out in the drawing for simplifying explanation.
  • the bell-shaped oven can be heated with any known system. However, it has proved to be of advantage to apply the system shown in the drawing; this system is also part of the present invention.
  • a chamber 40 with an upper inlet 41 to the interior of the oven is placed on one side, or several sides of the oven.
  • a heat exchanger 42 is installed e.g. of nonoxidizing steel.
  • the burners 43 of any type heat the exchanger. Thus, an ascending warm air current arises drawing into the interior of the oven.
  • the installation works as follows: When the car with the articles to be coated is put in the carrier the workman operates the lever A thus putting under pressure the line 34 and, as a consequence, the car rises to the cover of the oven 4. It is supposed that the oven is warm. Then the workman operates the lever B, thus putting under pressure the line 32, so that the doors 6 and 7 close. The installation should remain in this position about three minutes to heat the articles. After the heating time has passed the workman operates at first the lever B and then the lever A but this time in the opposite direction and longer, so that the half-doors are opened and the articles are dipped into the fluidized bed. Then the workman shuts the doors by means of the lever B and operates the lever C.
  • the cam 16 shakes the shaft 12, the pulley or sprocket 12 and finally the article 38. This shaking is necessary to make the powder penetrate into the finest grooves, notches and corners.
  • the dipping time is, in general, short and after the few seconds prescribed the workman opens the half-doors 6 and 7 (lever B), makes the carrier 9 rise again (lever A) till under the top of the oven 4 for the fusion or post-heating phase; he shuts the door (lever B) and stops the shaking (lever C). This phase lasts some fractions of a minute, e.g. 30 seconds. Then, the workman opens the door (lever B) and makes the carrier sink into the position shown in the drawing. Now the next cycle begins for coating articles which hang on a new car.
  • the rolling devices 39a, 39b, 39c and 39d can be moved along the rails 145 leading at all Positions I-IV (FIG. 5). These rails can form a closed ring so that the cars pushed by the workman would have to come back to the position from which the workman operates the installation. Thus, he would not have to travel the way from Position I to Position IV at each charging and discharging.
  • the rolling devices between the Positions II and IV are necessary for storing the coated articles for some time because otherwise the articles could not cool down and the coating would not become solid.
  • the levers A, B and C can be synchronized if necessary, and be equipped with common already existing devices in order to avoid a false operation or in order to simplify the operation itself. Besides, the workman has at his disposal a timer in order to control the exact duration of the phases.
  • Apparatus for coating articles with coating substances by dipping heated articles into a fluidized bed of the coating substance comprising acontainer for holding the fluidized bed, an oven above said container, means for heating said oven, doors at the bottom of said oven, means for opening and closing said doors, a carrier for the articles to be coated, hoist means for raising and lowering said carrier whereby said carrier is movable to and from a position in said oven and in said container, means for stopping the movement of said carrier in a position between said oven and said container, holding means for horizontally moving the articles, means on said carrier for receiving said holding means and horizontally moving articles, said hoist means for lowering and raising said carrier including pulley means mounted on parallel shafts arranged to be displaced in relation to one another, and shaking means including a rotatable cam operatively associated with said hoist means to impart a shaking movement to said carrier.
  • said holding means includes a plurality of cars, and said means on said carrier for receiving said holding means including horizontal rails which receive said cars for transporting the articles to be coated.
  • rolling devices are provided adjacent both sides of said carrier to receive the cars from and deliver them to said carrier, said rolling devices including horizontally extending rails, and the rails of said rolling devices and of said carrier being disposed for alignment with each other for the exchange of said cars in said carrier.
  • said hoist means includes a rope secured to said carrier, a shaft disposed above said oven, a pulley mounted on said shaft, aperture means in said oven, said rope extending through said aperture means and around said pulley, slidable mounting means for said pulley including vertical guides, said shaft being slidably mounted in said vertical guides, and said rotatable cam being disposed against said shaft for imparting a shaking movement thereto and thence to said rope and the articles on said carrier.
  • said oven includes a plurality of side walls, at least one of said walls having a chamber exposed to the top of said oven, said heating means including a heat exchanger being provided in said chamber, and said heat exchanger including at least one burner.

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  • Coating Apparatus (AREA)
  • Tunnel Furnaces (AREA)
US267020A 1962-03-22 1963-03-21 Coating and oven system including work handling means Expired - Lifetime US3262420A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT553862 1962-03-22

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DE (1) DE1234594B (de)
GB (1) GB955792A (de)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3431887A (en) * 1963-11-13 1969-03-11 Polymer Corp Apparatus for coating articles in a fluidized bed
US3507251A (en) * 1968-03-28 1970-04-21 Schlumberger Technology Corp Coating apparatus
US3574953A (en) * 1968-09-24 1971-04-13 Ayrodev Processes Limited Drying and curing ovens
US3659550A (en) * 1970-11-09 1972-05-02 Spring Tools Corp Fluid operated coating and drying machine
US3683848A (en) * 1966-05-18 1972-08-15 Glavenben Sa Formation of thin oxide layers
US3691988A (en) * 1971-04-05 1972-09-19 Thermolyne Corp Apparatus for automatically staining microscope slides
US3824952A (en) * 1972-10-05 1974-07-23 Riken Light Metal Ind Co Finish dip painting device of metal works on mass production basis
US3839988A (en) * 1969-07-30 1974-10-08 Durr O Apparatus for treating articles by immersion in dip tanks
US3851775A (en) * 1972-01-13 1974-12-03 A Zlotin Mechanism for handling a bullet melted in a hermetically-sealed furnace
US3861352A (en) * 1972-11-24 1975-01-21 Thorvald F Hammer Automatic galvanizing machines
US3968020A (en) * 1973-09-29 1976-07-06 Riken Keikinzoku Kogyo Kabushiki Kaisha Apparatus for surface treating metal members
US4284978A (en) * 1979-08-02 1981-08-18 Systems Engineering & Manufacturing Corp. Conveying system control
US5090362A (en) * 1989-03-17 1992-02-25 Schering Aktiengesellschaft Arrangement for galvanization of treatment goods in a series of baths
US5149353A (en) * 1988-05-11 1992-09-22 Tamglass Oy Method for intermittently storing pairs of glass sheets in a windshield production line
US5195426A (en) * 1991-12-31 1993-03-23 Darlington Dairy Supply Co., Inc. Cheese brining system with collapsible racks
US5340398A (en) * 1993-04-08 1994-08-23 Wayne Sr Jack L Foliage coating method and apparatus
US6676355B1 (en) * 2001-07-20 2004-01-13 American Airlines, Inc. Apparatus and method to effectuate pre-lift positioning for a drop furnace cage
US20180085781A1 (en) * 2012-01-17 2018-03-29 Automatic Coating Limited Coating Apparatus and Method
US10730068B2 (en) 2017-08-15 2020-08-04 Automatic Coating Limited Coating apparatus
CN111515079A (zh) * 2020-04-17 2020-08-11 罗亨发 一种密封式荷兰网浸塑设备

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US22662A (en) * 1859-01-18 Improvement in machinery for tarring oakum
US810394A (en) * 1905-03-13 1906-01-23 Susquehanna Silk Mills Process of oxidizing fabrics.
US1332934A (en) * 1918-08-24 1920-03-09 Glidden Co Dipping-machine
US1790501A (en) * 1931-01-27 of detboit
US1838015A (en) * 1925-12-01 1931-12-22 Bbc Brown Boveri & Cie Annealing apparatus
US2263029A (en) * 1940-07-17 1941-11-18 Northrup Aircraft Inc Heat treating apparatus
US2265849A (en) * 1940-08-02 1941-12-09 Aluminum Co Of America Heat treating apparatus
US2341766A (en) * 1941-12-12 1944-02-15 Vernie A Fox Rapid-quench heat-treating oven
US2413987A (en) * 1942-01-10 1947-01-07 Western Electric Co Heat-treating apparatus
US2458684A (en) * 1946-05-14 1949-01-11 Stevens Arnold Inc Radio-frequency apparatus
US2498339A (en) * 1947-09-11 1950-02-21 William J Miskella Combination paint booth and baking oven
US2844489A (en) * 1957-12-20 1958-07-22 Knapsack Ag Fluidized bed coating process
US2854044A (en) * 1956-09-28 1958-09-30 Edward F Raguse Work table and sawhorse with carrying wheels raised and lowered by a jackscrew
US2855193A (en) * 1955-03-15 1958-10-07 Hayes Inc C I Elevator heat treatment furnace construction
US3136650A (en) * 1961-11-01 1964-06-09 Gen Electric Method for coating a surface of an article with a resin layer

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US22662A (en) * 1859-01-18 Improvement in machinery for tarring oakum
US1790501A (en) * 1931-01-27 of detboit
US810394A (en) * 1905-03-13 1906-01-23 Susquehanna Silk Mills Process of oxidizing fabrics.
US1332934A (en) * 1918-08-24 1920-03-09 Glidden Co Dipping-machine
US1838015A (en) * 1925-12-01 1931-12-22 Bbc Brown Boveri & Cie Annealing apparatus
US2263029A (en) * 1940-07-17 1941-11-18 Northrup Aircraft Inc Heat treating apparatus
US2265849A (en) * 1940-08-02 1941-12-09 Aluminum Co Of America Heat treating apparatus
US2341766A (en) * 1941-12-12 1944-02-15 Vernie A Fox Rapid-quench heat-treating oven
US2413987A (en) * 1942-01-10 1947-01-07 Western Electric Co Heat-treating apparatus
US2458684A (en) * 1946-05-14 1949-01-11 Stevens Arnold Inc Radio-frequency apparatus
US2498339A (en) * 1947-09-11 1950-02-21 William J Miskella Combination paint booth and baking oven
US2855193A (en) * 1955-03-15 1958-10-07 Hayes Inc C I Elevator heat treatment furnace construction
US2854044A (en) * 1956-09-28 1958-09-30 Edward F Raguse Work table and sawhorse with carrying wheels raised and lowered by a jackscrew
US2844489A (en) * 1957-12-20 1958-07-22 Knapsack Ag Fluidized bed coating process
US3136650A (en) * 1961-11-01 1964-06-09 Gen Electric Method for coating a surface of an article with a resin layer

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3431887A (en) * 1963-11-13 1969-03-11 Polymer Corp Apparatus for coating articles in a fluidized bed
US3683848A (en) * 1966-05-18 1972-08-15 Glavenben Sa Formation of thin oxide layers
US3507251A (en) * 1968-03-28 1970-04-21 Schlumberger Technology Corp Coating apparatus
US3574953A (en) * 1968-09-24 1971-04-13 Ayrodev Processes Limited Drying and curing ovens
US3839988A (en) * 1969-07-30 1974-10-08 Durr O Apparatus for treating articles by immersion in dip tanks
US3659550A (en) * 1970-11-09 1972-05-02 Spring Tools Corp Fluid operated coating and drying machine
US3691988A (en) * 1971-04-05 1972-09-19 Thermolyne Corp Apparatus for automatically staining microscope slides
US3851775A (en) * 1972-01-13 1974-12-03 A Zlotin Mechanism for handling a bullet melted in a hermetically-sealed furnace
US3824952A (en) * 1972-10-05 1974-07-23 Riken Light Metal Ind Co Finish dip painting device of metal works on mass production basis
US3861352A (en) * 1972-11-24 1975-01-21 Thorvald F Hammer Automatic galvanizing machines
US3968020A (en) * 1973-09-29 1976-07-06 Riken Keikinzoku Kogyo Kabushiki Kaisha Apparatus for surface treating metal members
US4284978A (en) * 1979-08-02 1981-08-18 Systems Engineering & Manufacturing Corp. Conveying system control
US5149353A (en) * 1988-05-11 1992-09-22 Tamglass Oy Method for intermittently storing pairs of glass sheets in a windshield production line
US5090362A (en) * 1989-03-17 1992-02-25 Schering Aktiengesellschaft Arrangement for galvanization of treatment goods in a series of baths
US5195426A (en) * 1991-12-31 1993-03-23 Darlington Dairy Supply Co., Inc. Cheese brining system with collapsible racks
US5340398A (en) * 1993-04-08 1994-08-23 Wayne Sr Jack L Foliage coating method and apparatus
US6676355B1 (en) * 2001-07-20 2004-01-13 American Airlines, Inc. Apparatus and method to effectuate pre-lift positioning for a drop furnace cage
US20180085781A1 (en) * 2012-01-17 2018-03-29 Automatic Coating Limited Coating Apparatus and Method
US10464101B2 (en) * 2012-01-17 2019-11-05 Automatic Coating Limited Coating apparatus and method
US10730068B2 (en) 2017-08-15 2020-08-04 Automatic Coating Limited Coating apparatus
US11491506B2 (en) 2017-08-15 2022-11-08 Automatic Coating Limited Coating apparatus
US12064786B2 (en) 2017-08-15 2024-08-20 Automatic Coating Limited Coating apparatus
CN111515079A (zh) * 2020-04-17 2020-08-11 罗亨发 一种密封式荷兰网浸塑设备
CN111515079B (zh) * 2020-04-17 2021-06-15 南京溧水高新产业股权投资有限公司 一种密封式荷兰网浸塑设备

Also Published As

Publication number Publication date
GB955792A (en) 1964-04-22
DE1234594B (de) 1967-02-16

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