EP0600846A1 - Düse - Google Patents

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Publication number
EP0600846A1
EP0600846A1 EP93850223A EP93850223A EP0600846A1 EP 0600846 A1 EP0600846 A1 EP 0600846A1 EP 93850223 A EP93850223 A EP 93850223A EP 93850223 A EP93850223 A EP 93850223A EP 0600846 A1 EP0600846 A1 EP 0600846A1
Authority
EP
European Patent Office
Prior art keywords
piston rod
stock
cylinder
nozzle
bore
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.)
Granted
Application number
EP93850223A
Other languages
English (en)
French (fr)
Other versions
EP0600846B1 (de
Inventor
Dick Svensson
Claes-Erik Söderman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Spraying Systems Tecnique ACS AB
Original Assignee
Spraying Systems Tecnique ACS AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Spraying Systems Tecnique ACS AB filed Critical Spraying Systems Tecnique ACS AB
Publication of EP0600846A1 publication Critical patent/EP0600846A1/de
Application granted granted Critical
Publication of EP0600846B1 publication Critical patent/EP0600846B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
    • B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
    • B05B7/0441—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber
    • B05B7/045—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber the gas and liquid flows being parallel just upstream the mixing chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
    • B05B13/0627—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/70—Arrangements for moving spray heads automatically to or from the working position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/14—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts
    • B05B15/16—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts for preventing non-intended contact between spray heads or nozzles and foreign bodies, e.g. nozzle guards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B05B7/1209—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means for each liquid or other fluent material being manual and interdependent

Definitions

  • the present invention is directed to a nozzle unit for the automatic injection of a treatment fluid into a cavity, comprising a spray nozzle, a nozzle holder in which the spray nozzle is secured, a pneumatic cylinder assembly having a cylinder device defined by a cylindrical wall, and forward and rear cylinder end walls, and having a piston device translatably disposed in the cylinder assembly and a piston rod whose ends are fixedly secured respectively to the piston device and nozzle holder for translating the latter in relation to the cylinder device, the piston device being arranged to engage end-position senders adjacent at least one of the cylinder end walls, a bellows device which encloses the piston rod and which is fixedly secured to the forward cylinder end wall and the nozzle holder, means for feeding treatment fluid and means for feeding gas under pressure to a mixing assembly in order to mix the fluid and the gas and to expel the resulting mixture, means for feeding working gas to the cylinder assembly, and a mount on the cylinder assembly for mounting the nozzle unit to a positioning unit.
  • the invention is directed towards a nozzle unit for various treatment processes concerning cavities and the like in constructions which are to be surface treated or filled with a fluid.
  • the unit is especially intended for injecting rust protectant into cavities and beams in vehicle chassis wherein their inner surfaces are coated with a rust protecting oil, wax or similar, and is intended, together with a plurality of similar nozzle units, to automatically treat a vehicle chassis on a production line.
  • a nozzle unit of this sort is described in Swedish patent no. 8703858-4 (publication no. 459 081).
  • this prior art nozzle unit has a comparatively large number of connecting hoses, which can hinder the unit in its operation and adjustment and which are exposed to the risk of damage.
  • the object of the invention is to provide a nozzle unit having a minimal number of externally located, stationary lines at a safe distance from the spray nozzle of the unit.
  • a further object of the invention is to provide a nozzle unit with a comparativelely simple construction, which is easy to clean and which lacks seals for the mixing assembly, an advantage with aggressive fluids.
  • a nozzle unit as defined in the introductory passage, which is characterized in that the piston device and the piston rod present through going, concentrically oriented bores, the piston rod bore being aligned with the spray nozzle bore, a connecting nipple is disposed at the rear cylinder end wall for feeding treatment fluid to a stock conduit fixedly secured to this end wall and which is concentrically disposed in the cylinder assembly and inserts into the piston device bore and the piston rod bore, and which, in the projecting state of the nozzle unit, is arranged, together with a conduit means for feeding mixing gas, to discharge at the inner end of the mixing assembly.
  • the nozzle unit of the invention comprises an interchangable spray nozzle 1 having a central bore 27, which is releasably secured in a nozzle holder 2.
  • the connecting end of the spray nozzle has a control peg with which the spraying direction of the nozzle is adjusted by the peg being fitted into a slot in the nozzle holder, which is schematically depicted in the right hand part of Fig. 2.
  • Reference numeral 3 generally indicates a pneumatic cylinder assembly which is preferably of the Atlas Copco C 43 MD type with rotationally rigid piston rod 4.
  • the cylinder assembly 3 comprises a cylindrical wall 5 having attached forward and rear cylinder end walls, respectively 6 and 7.
  • a piston device 8 is arranged to reciprocate between the cylinder end walls and is equipped with conventional seals.
  • the piston device presents a through going, concentrically arranged bore 9 in which the piston rod 4 is secured.
  • the nozzle holder 2 is fixedly secured to the end of the piston rod which projects from the cylinder assembly, for example with a jam nut and a locking screw.
  • a bellows device 10 protectively encloses the projecting piston rod 4 and is conveniently secured adjacent the forward cylinder end wall 6 and the nozzle holder 2.
  • Fig. 1 also depicts the nozzle unit signal valve 11, working valve 12 with its choke valve 13 and stock valve 14 with its connecting nipple 16 for a treatment fluid (stock) line.
  • Reference numeral 17 indicates the associated control circuit which, together with the above mentioned valves will be presented in more detail below and with reference to Fig. 4.
  • Figs. 2 and 3 will now be referred to for a more detailed description of the internal construction of the nozzle unit.
  • the piston rod 4 which is shown in its completely projecting state, presents a through going and concentrically arranged bore 18 and 19, the bore 18 in the projecting portion of the piston rod having a lesser internal diameter than that of the bore 19 in the piston rod in the inserting portion of the piston device.
  • An intermediate portion 20 having a diameter varying in the longitudinal direction from the bore 18 to the bore 19 and preferably, but not necessarily, of conical form, communicates the bores with each other, see Fig. 3 in particular.
  • a pneumatic, spray position signal sender 11, 26 is disposed in the forward cylinder end wall 6, which will be described in more detail in connection with Fig. 4.
  • An electric, home position sender 29 is disposed in the rear end wall, which is schematically depicted in Fig. 1. Aside from these end position senders, means 21 for feeding working gas under pressure to the cylinder assembly 3, and for venting, are respectively arranged for driving the piston device 8 and consequently the piston rod 4 forwards and backwards in the cylinder assembly.
  • the stock valve 14 is fixedly linked with the rear cylinder end wall 7 and fixedly supports a stock feed conduit 22 which is concentrically arranged in relation to the cylindrical wall 5 and which discharges in the vicinity of the forward cylinder end wall 6.
  • the stock feed conduit 22 accordingly extends through the bore 9 in the piston device 8 and into the bore 18-20 in the piston rod, the outer diameter of the stock feed conduit being in all essential respects of similar size to the bore 18 in the projecting portion of the piston rod, but being substantially smaller than the bore 19 in the inserting portion of the piston rod.
  • a mount 28 is disposed on the cylinder assembly 3 for mounting the nozzle unit on or adjacent a mechanical positioning unit (not depicted), such as those of the prior art in this technical field, see for example the above mentioned Swedish patent no. 8703858-4 to which reference is made in this context.
  • a mechanical positioning unit such as those of the prior art in this technical field, see for example the above mentioned Swedish patent no. 8703858-4 to which reference is made in this context.
  • the nozzle unit of the present invention preferably works in the manner indicated below.
  • the spray cycle is started with a pneumatic control signal 15 which is ceased when the predetermined amount of stock has been sprayed into the cavity.
  • This control may, for example, be carried out with a program in a computer unit (not depicted).
  • the control signal is without pressure, which leads to the cylinder assembly 3 being subjected to pressure on the minus side (on the right hand side of the piston device 8 in Fig. 2) and therefore also the piston device in the home position at the rear cylinder end wall 7, which is detected by the electrical home position sender 29.
  • control signal 15 When the control signal 15 is generated, it prompts the working valve 12 to change position against the action of a compression spring (see Fig. 4 which depicts the starting position for the nozzle unit), the working gas being allowed to flow from the working gas feed line 24, through the valve 12 and the connection 21 in the rear cylinder end wall 7, and into the plus side of the cylinder assembly 3 (to the left of the piston device 8 in Fig. 2).
  • the minus side is vented through the connection 21 in the forward cylinder end wall 6, the piston device 8 moving towards the forward end wall and projecting the hollow piston rod 4 fixed to the piston device therefrom, the spray nozzle 1 secured in the free end of the piston rod being inserted into the cavity which is to be treated.
  • the control signal also branches off to signal valve 11, as is shown with the arrows 15 in Fig. 4.
  • the nozzle unit When the piston device reaches its outer end position adjacent the forward cylinder end wall 6, i.e. the position depicted in Figs. 2 and 3, the nozzle unit is in its spray position and the piston device 8 acts on the operating means 26 of the forward end position sender, which in turn shifts the signal valve 11 against the action of a compression spring, wherein the control signal can pass through the signal valve 11 and be transmitted to the stock valve 14.
  • the spray nozzle 1 can not be entirely projected into the cavity which is to be treated, for example due to missing the spray opening, the signal valve will not be activated in this event and the stock valve will not be acted on by any signal, thus providing automatic monitoring.
  • the control signals allowed through will, however, shift the stock valve 14 against the action of a compression spring, wherein the treatment fluid is allowed to flow from the treatment fluid feed line 25, through the stock conduit 22 and into the bore 18 in the piston rod 4 via its intermediate portion 20.
  • the sealing fit between the stock conduit 22 and the through going bore 18 in the projecting portion of the piston rod leads to the stock conduit acting as a choke for the working gas which is introduced through the rear cylinder end wall 7, so that the piston device 8 is driven with full gas pressure from the starting position adjacent the cylinder end wall 7 to a position shortly in front of the outermost position adjacent the forward cylinder end wall 6, as depicted in Figs. 2 and 3, i.e. the spray position of the nozzle unit.
  • the stock conduit 22 discharges into the intermediate portion 20, which means that the working gas can flow through the channel means 23 and into the bore 18.
  • the treatment fluid is consequently fed through the stock conduit 22 and sprays out within the through going bore 18, 20 in the piston rod 4, where it is atomized and mixed with the working gas (the blowing air) from the "plus side" of the cylinder assembly 3 (the side adjacent the rear cylinder end wall 7).
  • the mixture of blowing air and treatment fluid, which is mixed in the through going bore 18, is thereafter sprayed out into the cavity in the chassis (above all due to the pressure of the blowing gas) through the spray nozzle 1 which is secured in the nozzle unit holder 2 on the end of the piston rod.
  • the working valve 12 is fed with working gas via a distributor block which distributes working gas to several nozzle units in a group.
  • the treatment stock which is to be sprayed is fed from a common feed line 25, wherein the spray amount of stock is measured with a geared meter (not depicted) which is common for the entire group.
  • a magnetic valve (not depicted) ceases the control signal 15.
  • the control signal disappears, this means that the stock valve 14 closes immediately.
  • the signal to the working valve 12 is evacuated via choke valve 13 which maintains the valve 12 in the open position for 0.5 - 1. seconds after the stock valve has closed. This subsequent blowing is carried out to blow the nozzle clean from stock.
  • the treatment fluid may be paint, powder material and similar.
  • the working gas is preferably air but may, if so desired, be any inert gas or gas selected for compatibility with the treatment fluid. It is also possible, when necessary, to swap the working gas for a fluid of some other sort than treatment fluid, for example a liquid such as a diluent.
  • nozzle unit has all the valves etc needed for operating the unit centrally located in the plant and connected to the nozzle unit with hoses.
  • at least four hoses are required, three for compressed air and one for spray stock. Two of these hoses are movable at the nozzle unit.
  • the valves have been shifted out to the cylinder - the air valve for the working air and the stock valve. Now only two hoses are required. None are movable.
  • the stock is now sprayed out through the hollow piston rod of the cylinder, and the position of the cylinder directly activates the opening of the stock valve, which means simplifications in the control system which controls the process. Fewer signals are needed for operation.

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  • Nozzles (AREA)
EP93850223A 1992-12-02 1993-12-01 Düse Expired - Lifetime EP0600846B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9203628 1992-12-02
SE9203628A SE470535B (sv) 1992-12-02 1992-12-02 Munstycksenhet för automatisk inblåsning av en behandlingsfluid i ett hålrum

Publications (2)

Publication Number Publication Date
EP0600846A1 true EP0600846A1 (de) 1994-06-08
EP0600846B1 EP0600846B1 (de) 1996-04-10

Family

ID=20388002

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93850223A Expired - Lifetime EP0600846B1 (de) 1992-12-02 1993-12-01 Düse

Country Status (3)

Country Link
EP (1) EP0600846B1 (de)
DE (1) DE69302164T2 (de)
SE (1) SE470535B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102626680A (zh) * 2012-03-26 2012-08-08 余姚市安统五金有限公司 一种制动泵活塞腔体涂油机
CN106345632A (zh) * 2015-07-16 2017-01-25 机器人用智能外部设备有限责任公司 用于输出防腐蚀蜡的机器人工具和机器人及对此的方法
CN115106216A (zh) * 2022-07-18 2022-09-27 南京工业大学 一种喷涂装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0311586A2 (de) * 1987-10-07 1989-04-12 Atlas Copco Aktiebolag Vorrichtung zur Positionierung von Werkzeugen relativ zu einem Fahrzeug

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0311586A2 (de) * 1987-10-07 1989-04-12 Atlas Copco Aktiebolag Vorrichtung zur Positionierung von Werkzeugen relativ zu einem Fahrzeug
SE459081B (sv) * 1987-10-07 1989-06-05 Atlas Copco Ab Foerfarande och anordning foer positionering av ett antal arbetsorgan relativt en bilkaross

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102626680A (zh) * 2012-03-26 2012-08-08 余姚市安统五金有限公司 一种制动泵活塞腔体涂油机
CN106345632A (zh) * 2015-07-16 2017-01-25 机器人用智能外部设备有限责任公司 用于输出防腐蚀蜡的机器人工具和机器人及对此的方法
CN106345632B (zh) * 2015-07-16 2020-11-06 机器人用智能外部设备有限责任公司 用于输出防腐蚀蜡的机器人工具和机器人及对此的方法
CN115106216A (zh) * 2022-07-18 2022-09-27 南京工业大学 一种喷涂装置
CN115106216B (zh) * 2022-07-18 2023-08-18 南京工业大学 一种喷涂装置

Also Published As

Publication number Publication date
SE9203628L (sv) 1994-06-03
SE9203628D0 (sv) 1992-12-02
EP0600846B1 (de) 1996-04-10
DE69302164D1 (de) 1996-05-15
DE69302164T2 (de) 1996-09-05
SE470535B (sv) 1994-07-25

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