EP1156882A1 - Powder coating device - Google Patents
Powder coating deviceInfo
- Publication number
- EP1156882A1 EP1156882A1 EP99968799A EP99968799A EP1156882A1 EP 1156882 A1 EP1156882 A1 EP 1156882A1 EP 99968799 A EP99968799 A EP 99968799A EP 99968799 A EP99968799 A EP 99968799A EP 1156882 A1 EP1156882 A1 EP 1156882A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bellows
- powder coating
- coating device
- powder
- compressed air
- 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
Links
- 239000000843 powder Substances 0.000 title claims abstract description 52
- 239000011248 coating agent Substances 0.000 title claims abstract description 22
- 238000000576 coating method Methods 0.000 title claims abstract description 22
- 230000008878 coupling Effects 0.000 claims abstract description 22
- 238000010168 coupling process Methods 0.000 claims abstract description 22
- 238000005859 coupling reaction Methods 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229940098458 powder spray Drugs 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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
- B05B7/14—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 designed for spraying particulate materials
- B05B7/1404—Arrangements for supplying particulate material
Definitions
- the invention relates to a powder coating device according to the preamble of claim 1.
- the invention relates to a powder coating device containing at least one adjustable throttle device for throttling the flow of at least one compressed air line, which is connected to a powder flow path, can be conveyed pneumatically on soft powder; for each throttle device, an electric motor which is drivingly connected to a rotatable adjusting shaft of the throttle device.
- a powder coating device of this type is known from DE 44 09 493 AI, and similarly also from US 3,625,404.
- Your throttle device contains two throttles, which can be set either by hand or a servomotor.
- the two throttles each consist of a valve seat and a valve body, which are arranged opposite to each other.
- the two valve bodies are connected to each other.
- one throttle is opened to the same extent as the other is closed when a shaft connected to it is adjusted axially manually or by the servomotor mentioned by rotation in a thread.
- a powder spray coating system is known from EP 0 297 309 B1, in which a flow throttle adjustable by a separate actuator is arranged in a conveying air line and an additional air line. Both lines are connected on the one hand to a compressed air shaft and on the other hand to an injector for pneumatic powder conveyance.
- the conveying air creates a negative pressure in the injector and thus sucks in powder from a powder container.
- a greater vacuum or suction is required to suck in the powder, which is generated by a correspondingly stronger conveying air flow.
- An electronic control device regulates the setting of the two throttles as a function of the amount of powder to be conveyed per unit of time.
- the two chokes are not linked mechanically, but only by the electronic control device.
- the adjustment shaft of an adjustable flow restrictor is rotatable and makes axial adjustment movements. Therefore, when using an electric motor to rotate the setting shaft, an axially variable connection between the setting shaft and a motor shaft is required if the motor shaft is not sufficiently axially displaceable. Any desired throttle setting requires a corresponding rotation or change in the angle of rotation of the motor shaft. Such throttle settings generate "click" noises when the electric motor starts and stops.
- Each electric motor is suitable as an actuator for the flow restrictor, provided that it can carry out exact numbers of revolutions and rotational angle positions depending on the control by an electronic control device.
- the object is achieved in that the electric motor is drivingly connected to the adjusting shaft of the throttle device by means of a bellows coupling. and that an output shaft of the stepper motor, the bellows and the adjusting shaft of the throttle device are arranged axially to one another.
- Any type is suitable as an electric motor that can perform defined rotary movements through electrical control, e.g. DC motors, but in particular stepper motors, and motor-gear units, the gear reducing the motor speed.
- a low-noise, exact and reproducible setting of the throttle device A stepper motor can be easily rotated step by step through an angular distance corresponding to each step by means of electrical pulses. Each step corresponds to a specific throttle setting. Since the number of steps required for each throttle setting can be predetermined, each throttle setting can be repeatedly and precisely adjusted at any time. If separate throttles are used for separate pressure lines, this can be done per unit of time flowing air volume in each compressed air line can be set individually and precisely.
- an electronic control device is preferably used, which setpoints can be specified for the amount of powder to be conveyed per unit of time and / or the amounts of air required therefor.
- the adjustable part of the throttle is mechanically connected to an adjusting shaft which can be moved axially for moving the adjustable element back and forth in a thread.
- the thread of the throttle moves its adjustable part, usually not a valve seat but a valve cone, back and forth accordingly.
- This axial movement must be glicked out relative to the axially stationary output shaft of the stepper motor.
- This axial compensation is carried out according to the invention in a simple manner by means of a bellows coupling.
- the bellows coupling is also used to greatly reduce the noise of the stepper motor, which is chopped off in small increments. These steps of the stepper motor would be a not inconsiderable noise pollution without the bellows coupling.
- a small angular, axial and / or radial axis offset between the output shaft of the stepper motor and the setting shaft of the throttle caused by production and / or assembly is automatically compensated for by the bellows coupling.
- the entire device can be manufactured with simple, commercially available components and is therefore inexpensive.
- the bellows of the bellows coupling has the property that it is very stiff but has a damping effect on torsion and is relatively soft on axial loading.
- the bellows of the bellows coupling can consist of any flexible material, preferably also spring-compressible material, preferably rubber.
- FIG. 1 schematically shows a structural unit of a throttle device with an electric stepper motor connected to it via a single-bellows coupling
- Fig. 2 shows schematically a powder coating device according to the invention
- FIG. 3 schematically shows another embodiment of a
- the assembly 1 according to the invention shown in FIG. 1 consists of a housing 2 shown in longitudinal section, an electric motor attached to a housing end wall 4, preferably a stepper motor 6, a throttle device 10 attached to an opposite housing end wall 8, and one in the housing 2 Bellows clutch 12 arranged axially to the stepper motor 6 and to the throttle device 10.
- the throttle device 10 contains at least one throttle with a fixed (or axially movable) throttle valve seat and a throttle valve body which is axially movable (or stationary) relative thereto.
- the throttle valve body is his axial adjustment with an adjusting shaft 14 rotatably connected.
- the bellows coupling 12 has a bellows 16, which can have several folds, but according to the preferred embodiment has only one fold with a fold 18 on the outer circumference.
- the two inner ends 20 and 22 of the bellows 16, which are on a substantially smaller diameter, are each radially through an outer circumferential groove 25 and 27, respectively, by means of a ring element which is resilient in diameter and preferably also radially elastic, preferably an O-ring 24 and 26, preferably made of rubber and clamped axially.
- One outer circumferential groove 25 is formed in a connecting ring 30, which is non-rotatably mounted on an output shaft 32 of the stepping motor 6.
- the other outer circumferential groove 27 is formed in a connecting ring 34, which is non-rotatably mounted on an adapter shaft 36, which is coupled to the adjusting shaft 14 of the throttle device 10 in a rotational test.
- the bellows 16 is angular, axially and radially movable to compensate for angular, axial and / or radial deviations and changes between the output shaft 32 and the adjusting shaft 14. This means that their radially inner end portions 20 and 22 are angular, axially and radially movable relative to each other. Torsional stress of the bellows 16 is relatively stiff, but s ⁇ OSS absorbing.
- the bellows ends 20 and 22 can only be rotated relative to one another to a limited extent and, in the case of such torsional movements, the bellows has a shock-absorbing effect due to its material properties.
- the bellows 16 is preferably made of rubber or a similarly flexible and inherently resilient material. The application of the assembly 1 of FIG. 1 is described below with reference to FIG. 2.
- the powder coating device of FIG. 2 contains three structural units 1.
- the injector 50 works according to the Venturi principle as a pneumatic pump.
- Conveying air of the winning religiousle device 40 flows into the injector 50 from an injector nozzle 52 axially into an axially opposite powder outlet channel 54 and generates a vacuum or suction in an intermediate vacuum section 56.
- This negative pressure or suction sucks coating powder from a powder container 55 into the conveying air stream via a powder inlet 60.
- the mixture of exhaust air and powder flows via a powder hose 62 to a spray device 64, and is sprayed by the latter onto an object 66 to be coated.
- Additional air line 42 is connected to the powder outlet channel 54 so far downstream of the vacuum region 56 that it has no or only a negligibly small influence on the vacuum.
- This first additional air serves to keep the total amount of air constant by compensating for changes in the conveying air flowing per unit of time when the conveying air of the conveying air line 40 is used to convey more powder is increased or reduced to promote less powder.
- the second auxiliary air line 44 is rarely used and can be used to influence the strength of the negative pressure in the negative pressure region 56 additionally or independently of the conveying air of the conveying air line 40 and thus also to influence the amount of powder conveyed per unit of time.
- An electronic control device 68 regulates in dependence; from at least one target value 70 of the powder quantity to be conveyed per unit time and / or the air quantity of the conveying air line 40, the first additional air line 42 and / or the second additional air line 44 to be conveyed per unit time, the setting of the throttle 46 assigned to it by the electric stepper motor 6 of the unit 1 .
- FIG. 3 shows a structural unit 101 with: an electric stepping motor 6, which is connected to the adjusting shaft 14 of a double valve body 72 in a drive-connected manner via a bellows coupling 12 of the type described.
- the double valve body 72 contains two throttle valve bodies 74 and 76, which are axially rigidly connected to one another, each with in opposite directions. a throttle valve seat 75 or 77 cooperate. To the same extent that one throttle valve body 74 or 76 moves away from its throttle valve seat 75 or 77, the other throttle valve body 76 or 74 in question moves closer to its throttle valve seat 77 or 75.
- the throttle device 10 of Fig. 3 is schematically in Axial section shown.
- the double valve body 72 can be rotated in threads 80 or 81 of a housing 84 either by a manual adjusting element 86 or by the stepper motor 6, which is connected in a rotationally fixed manner to the double valve body 72 arranged axially thereto via the bellows coupling 12 and the adjusting shaft 14.
- a central compressed air inlet 86 is connected on the one hand via a compressed air line 87 with a pressure regulator 88 to the compressed air source 48 and on the other hand in the housing 84 through a channel 90 through which the double valve body 72 extends axially, with the two throttle valve seats 75 and 77 in terms of flow.
- the axial channel 90 is separated by the throttle valve bodies 74 and 76 from a first outlet 91 to the conveying air line 40 and a second outlet 92 to the first additional air line 42.
- 3 can replace the two structural units 1 and their throttle 46 in the conveying air line 40 and the additional air line 42 in FIG. 2.
- This has the advantage that, instead of the two throttles 46 of these two lines, only the double throttle or assembly 101 and only one stepper motor 6 and one bellows coupling 12 are required instead of two stepper motors and two bellows couplings.
- the total air quantity of conveying air and first additional air is always kept constant by the additional air of the first additional air line 42 being increased or reduced in a predetermined ratio by the unit 101, as the conveying air of the conveying air line 40 is reduced or increased.
- a further advantage of the embodiment according to FIG. 3 is that an electronic control device 68 for controlling the stepping motor 6 only requires a single setpoint 70 which is in a direct relationship to the conveyed air quantity to be conveyed Conveying air line 40 and here at the same time is in a predetermined ratio to the amount of powder to be conveyed per unit of time.
Landscapes
- Nozzles (AREA)
- Electrostatic Spraying Apparatus (AREA)
- Seal Device For Vehicle (AREA)
- Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
- Coating Apparatus (AREA)
- Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
- Catching Or Destruction (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19910748 | 1999-03-11 | ||
DE19910748A DE19910748A1 (en) | 1999-03-11 | 1999-03-11 | Powder coating device |
PCT/EP1999/009939 WO2000053334A1 (en) | 1999-03-11 | 1999-12-15 | Powder coating device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1156882A1 true EP1156882A1 (en) | 2001-11-28 |
EP1156882B1 EP1156882B1 (en) | 2003-04-09 |
Family
ID=7900527
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99968799A Expired - Lifetime EP1156882B1 (en) | 1999-03-11 | 1999-12-15 | Powder coating device |
Country Status (11)
Country | Link |
---|---|
US (1) | US6589341B1 (en) |
EP (1) | EP1156882B1 (en) |
JP (1) | JP3553503B2 (en) |
CN (1) | CN1095694C (en) |
AT (1) | ATE236728T1 (en) |
BR (1) | BR9910775A (en) |
CA (1) | CA2334278C (en) |
DE (2) | DE19910748A1 (en) |
ES (1) | ES2194546T3 (en) |
PL (1) | PL191611B1 (en) |
WO (1) | WO2000053334A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006087625A1 (en) * | 2005-02-17 | 2006-08-24 | Itw Gema Ag | Compressed air throttle device and a powder spray coating device |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10357814A1 (en) * | 2003-12-10 | 2005-07-14 | Itw Gema Ag | Gas line system, in particular in a powder spray coating device |
US20060102075A1 (en) * | 2004-11-18 | 2006-05-18 | Saylor Austin A | Fluid flow control |
CN105820667A (en) * | 2016-05-06 | 2016-08-03 | 安徽华辉塑业科技股份有限公司 | Child toy surface paint and preparation method thereof |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1752106A (en) * | 1927-12-19 | 1930-03-25 | Cook Electric Co | Flexible coupling |
US3063261A (en) * | 1961-05-15 | 1962-11-13 | Chain Belt Co | Flexible coupling for shafts |
DE1918621C3 (en) * | 1969-04-12 | 1972-01-20 | Stromag Maschf | Elastic shaft coupling |
US3625404A (en) | 1969-06-02 | 1971-12-07 | Ransburg Electro Coating Corp | Apparatus and method for dispensing particulate material |
US3612549A (en) * | 1970-05-25 | 1971-10-12 | Melvin H Berkowitz | Pressure seal |
US3727429A (en) * | 1971-06-10 | 1973-04-17 | Reliance Electric Co | Shaft coupling |
US3888093A (en) * | 1974-02-21 | 1975-06-10 | Reliance Electric Co | Flexible shaft coupling |
DE2927955C2 (en) * | 1979-07-11 | 1982-12-30 | Messerschmitt-Bölkow-Blohm GmbH, 8000 München | Method of manufacturing a coupling element |
EP0171156B1 (en) * | 1984-07-12 | 1988-03-30 | Masanori Mochizuki | Shaft coupling |
DE3721875A1 (en) | 1987-07-02 | 1989-01-12 | Gema Ransburg Ag | METHOD AND DEVICE FOR A POWDER SPRAY COATING SYSTEM |
US5233247A (en) * | 1991-07-16 | 1993-08-03 | The United States Of America As Represented By The Secretary Of The Navy | Precision drive and speed reduction device |
CH688989A5 (en) | 1993-03-26 | 1998-07-15 | Ribnitz Peter | Apparatus for conveying powder |
JP3867176B2 (en) * | 1996-09-24 | 2007-01-10 | アール・アイ・ディー株式会社 | Powder mass flow measuring device and electrostatic powder coating device using the same |
-
1999
- 1999-03-11 DE DE19910748A patent/DE19910748A1/en not_active Withdrawn
- 1999-12-15 CA CA002334278A patent/CA2334278C/en not_active Expired - Fee Related
- 1999-12-15 JP JP2000603815A patent/JP3553503B2/en not_active Expired - Fee Related
- 1999-12-15 BR BR9910775-9A patent/BR9910775A/en unknown
- 1999-12-15 AT AT99968799T patent/ATE236728T1/en not_active IP Right Cessation
- 1999-12-15 ES ES99968799T patent/ES2194546T3/en not_active Expired - Lifetime
- 1999-12-15 EP EP99968799A patent/EP1156882B1/en not_active Expired - Lifetime
- 1999-12-15 DE DE59905012T patent/DE59905012D1/en not_active Expired - Lifetime
- 1999-12-15 WO PCT/EP1999/009939 patent/WO2000053334A1/en active IP Right Grant
- 1999-12-15 CN CN99805981A patent/CN1095694C/en not_active Expired - Fee Related
- 1999-12-15 PL PL345126A patent/PL191611B1/en not_active IP Right Cessation
- 1999-12-15 US US09/701,439 patent/US6589341B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0053334A1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006087625A1 (en) * | 2005-02-17 | 2006-08-24 | Itw Gema Ag | Compressed air throttle device and a powder spray coating device |
AU2006215376B2 (en) * | 2005-02-17 | 2009-09-10 | Gema Switzerland Gmbh | Compressed air throttle device and a powder spray coating device |
US8430346B2 (en) | 2005-02-17 | 2013-04-30 | Hanspeter Michael | Compressed air throttle device and a powder spray coating device |
Also Published As
Publication number | Publication date |
---|---|
PL345126A1 (en) | 2001-12-03 |
EP1156882B1 (en) | 2003-04-09 |
CA2334278A1 (en) | 2000-09-14 |
PL191611B1 (en) | 2006-06-30 |
ES2194546T3 (en) | 2003-11-16 |
CN1300241A (en) | 2001-06-20 |
BR9910775A (en) | 2001-02-13 |
WO2000053334A1 (en) | 2000-09-14 |
CA2334278C (en) | 2005-05-24 |
CN1095694C (en) | 2002-12-11 |
JP2002537999A (en) | 2002-11-12 |
ATE236728T1 (en) | 2003-04-15 |
DE19910748A1 (en) | 2000-09-14 |
DE59905012D1 (en) | 2003-05-15 |
US6589341B1 (en) | 2003-07-08 |
JP3553503B2 (en) | 2004-08-11 |
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