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
  • B05B7/1472—Powder extracted from a powder container in a direction substantially opposite to gravity by a suction device dipped into the powder
• • 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
  • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
  • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
  • B05B15/557—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids the cleaning fluid being a mixture of gas and liquid
• • 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
  • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
  • B05B15/55—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter using cleaning fluids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
  • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
  • B05B12/149—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet characterised by colour change manifolds or valves therefor
• • 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
  • B05B7/1254—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated
  • B05B7/1263—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means being fluid actuated pneumatically actuated
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
  • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
  • F04B53/10—Valves; Arrangement of valves
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
  • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
  • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
  • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
  • B05B9/0413—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material with reciprocating pumps, e.g. membrane pump, piston pump, bellow pump

Definitions

• the coating material is transported from a storage container to a spray applicator by means of a conveyor device, and then sprayed onto the workpiece using the spray applicator.
• the coating material can be, for example, paint, adhesive, or an emulsion containing zinc dust.
• the conveyor device, the material-carrying lines, and the spray applicator should be cleaned or flushed.
• the coating material is replaced with a flushing medium.
• the flushing medium can be, for example, flushing gas (e.g., compressed air or nitrogen), flushing agent (e.g., solvent or water), or a mixture of flushing gas and flushing agent.
• EP 2 956 242 B1 is a coating agent pump and a cleaning process for the coating agent pump is known.
• the coating agent pump comprises a supply line and a connected pump inlet through which coating agent is fed to the pump.
• the pump inlet is connected to the pump chamber via a check valve.
• the pump also includes an exhaust opening through which compressed air is supplied to the pump.
• the exhaust opening is also connected to the check valve.
• compressed air is blown through the check valve, blowing the coating material out of the pump chamber towards the pump outlet.
• An object of the invention is to provide a conveying device with a flushing device in which, in addition to the conveying device, its upstream, material-carrying components, such as the supply line, can also be cleaned with the flushing device.
• a further object of the invention is to provide a method for operating the conveying device which is particularly time-efficient.
• the operating personnel can switch the conveying device according to the invention from conveying mode to cleaning mode particularly easily.
• Another advantage is that the amount of detergent required per color change can be significantly reduced. This also reduces disposal costs for waste material (a mixture of coating material and detergent).
• the conveying device according to the invention with a flushing device comprises a material conveyor for conveying coating material.
• the material conveyor in turn, has an inlet valve comprising a valve inlet and a valve outlet.
• the material conveyor also has a conveyor inlet for coating material, which is connected or connectable to the valve inlet.
• the conveying device further comprises a flushing agent conveyor for conveying flushing agent, which is also connected to the valve inlet.
• the inlet valve is designed as a check valve. This ensures that the fluid can flow unhindered in one direction and the backflow (i.e., flow in the opposite direction) is automatically prevented. This can be achieved by a return spring in the check valve, which ensures that the check valve closes automatically. This increases the efficiency of the conveying device and the application system and minimizes the risk of backflow damage.
• the inlet valve is designed as a poppet valve, ball valve, or needle valve.
• a poppet valve is particularly advantageous because it can be designed for optimal flushing.
• the poppet valve can handle large flow rates.
• the poppet valve has a simple design that is reliable and low-maintenance.
• the material conveyor is designed as a bellows pump, diaphragm pump, centrifugal pump, gear pump, peristaltic pump, piston pump, piston metering device, or positive displacement pump. Which material conveyor design is most suitable depends on the application. The most suitable material conveyor can be selected depending on the application.
• the rinsing agent conveyor is connected to the valve inlet via a check valve. This ensures that no coating material enters the rinsing agent line.
• the check valve is located close to the valve inlet. This minimizes dead space.
• a shut-off device is provided, which is connected to the conveyor inlet on the inlet side and to the inlet valve on the outlet side.
• the shut-off device is thus arranged between the conveyor inlet and the inlet valve.
• the pressure in the flushing medium can be increased even further.
• the increased flushing medium pressure allows the conveying chambers as well as the downstream material lines and components connected to the conveying chamber to be cleaned even more effectively. Without the shut-off device, most of the flushing medium would be discharged through the supply line.
• a control system is provided that is designed and operable to control the shut-off device. This enables user-friendly use of the conveying device.
• the conveying device has a compressed gas source that can be connected to the valve inlet.
• compressed gas as a flushing medium or as an additive in the flushing medium enables significant savings in flushing agent.
• the conveying device comprises a compressed gas valve, via which compressed gas originating from the compressed gas source is supplied to the rinsing agent This creates a mixture of detergent and gas, known as the rinsing medium, which achieves a very high cleaning effect through high flow velocities and turbulence.
• Flushing with the flushing medium can be continuous, discontinuous, or pulsed. If compressed air is mixed with the flushing agent in pulses via a timed valve and has a higher pressure than the flushing agent, the flushing agent flow is interrupted intermittently.
• the flushing agent conveyor is connected to the inlet valve via a flushing line.
• the compressed gas source is connected to the flushing line via a check valve. Without this check valve, there would be a risk of flushing agent from the flushing line entering the compressed gas line.
• the conveying device according to the invention have a further shut-off device, which is connected on the output side to a conveying chamber inlet of the conveying chamber and on the input side to the flushing agent conveyor.
• This embodiment does not require a shut-off device in front of the valve inlet.
• flushing of the conveying device can also take place without the shut-off device.
• the conveying device according to the invention can be provided with a flushing agent control valve which is designed and operable to control whether the flushing agent flows to the valve inlet or to the conveying chamber inlet.
• a flushing agent control valve which is designed and operable to control whether the flushing agent flows to the valve inlet or to the conveying chamber inlet.
• the flushing agent control valve When the flushing agent control valve is designed to flush the conveying device and the supply line sequentially.
• the flushing agent control valve can also be designed and operated in such a way that the conveying device and the supply line are flushed simultaneously.
• a throttle can be provided in the compressed gas line leading to the purging line.
• the compressed gas line can be connected directly to the purging line, i.e., bypassing the throttle.
• the throttle can be used to limit the volume flow so that the volume flow in the supply line (intake hose) does not become too high. This can prevent the material from splashing out of the supply line.
• Another embodiment of the conveying device comprises a pinch valve, which is designed and operable to open or close the conveyor inlet.
• a pinch valve offers the possibility of effective sealing by squeezing a hose or pipe to stop the flow. This is particularly advantageous when conveying abrasive or viscous media. Due to its simple design and the absence of moving parts, a pinch valve is low-maintenance and offers reliable performance over extended periods of operation.
• an application system which comprises the above-mentioned conveying device and an applicator which is connected to the conveying device. enables the advantages of the rinsing process to be extended to the supply line to the applicator and the applicator itself.
• the downstream side of the conveying device is closed to flush the supply line. This can be done, for example, with a valve.
• the flushing agent conveyor then pumps flushing agent into the supply line.
• the downstream side of the conveying device is opened, and flushing agent is pumped into the first conveying chamber using the flushing agent conveyor.
• the upstream side of the conveying device should be closed, for example, via a valve or a shut-off device.
• the optimal sequence of rinsing operations allows a rinsing process to be carried out with a high degree of material recovery and high rinsing agent effectiveness, saving both time and rinsing agent.
• rinsing is carried out in pulsed fashion. Whether rinsing is best in pulsed fashion or continuously, and whether rinsing is carried out with a mixture of pressurized gas and rinsing agent or only with rinsing agent, depends on the material to be rinsed. Accordingly, in one case, the pulsed method may be more efficient, while in another, rinsing with a mixture of pressurized gas and rinsing agent may be more efficient. Because the proposed embodiment provides various rinsing methods, the most efficient method can always be selected.
• compressed gas with a first compressed gas volume flow V ⁇ 1 is fed to the conveyor inlet with the aid of the first compressed gas valve when the compressed gas valve is open.
• a second compressed gas volume flow V ⁇ 2 is set with the aid of the second compressed gas valve. This prevents unnecessary contamination when the compressed gas exits the supply line.
• valve operation can be carried out both manually, i.e. by hand, or automatically by a control system.
• the valves can also be controlled automatically using a control system.
• Other components can also be controlled or regulated by the control system. This could be, for example, the pump pressure of the material conveyor.
• the drain valve for the drain line on the filter and the drain valve for the drain line on the spray applicator can also be controlled with the control system.
• the application system can be further automated. For example, changing the containers or lifting the suction hose out of the container can be automated. This also eliminates manual intervention in cleaning mode.
• FIG. 1 and 2 A first possible embodiment of the lower (suction-side) section of a material conveyor 1 is shown. This suction-side section of the material conveyor 1 is also referred to below as the intake tract 1.7. In addition, Figures 1 and 2 the lower part of the compressor stage 1.8 is shown.
• the coating material conveyor 1 is also referred to below as the material conveyor or conveyor.
• the material conveyor 1 is preferably part of an application system.
• Figure 3 The basic structure of a first embodiment of the application system is shown. The application system is designed to convey coating material 31 from a storage container 22 via a supply line 9.
• the storage container 22 is also referred to as a material storage container or container for coating material.
• the material conveyor 1 conveys the coating material 31, or material for short, out of the storage container 22 and to an applicator 45. From there, it can be applied to a workpiece (not shown in the figures).
• the applicator 45 can, for example, be a manually operated spray gun. An automatically operated spray gun is also not excluded. There can also be several spray guns connected to the material conveyor 1.
• the material conveyor 1 can be designed, for example, as a bellows pump, diaphragm pump, centrifugal pump, gear pump, peristaltic pump, piston pump, piston dosing pump or positive displacement pump.
• Figures 1 to 4 The material conveyors shown are piston pumps driven by an air motor. Instead of the air motor, an electric motor or a hydraulic motor can also be used to drive the piston 1.4.
• the electric motor is preferably a servo motor.
• the material conveyor 1 comprises an inlet for coating material 1.1, or in short material inlet or conveyor inlet, to which a supply line 9 is connected.
• the supply line 9 can be designed, for example, as a pipe or hose and is provided to conduct coating material 31 from a storage container 22 to the material conveyor 1.
• the material inlet 1.1 can be closed by means of a shut-off device 1.5.
• the shut-off device 1.5 is preferably designed as a pinch valve.
• the pinch valve 1.5 is controlled via a control connection 1.6. When pressurized air is applied to this connection, the pinch in the pinch valve 1.5 expands and closes the channel 1.9 behind the inlet 1.1. In the pressure-free state, the pinch in the pinch valve 1.5 is relaxed and the channel 1.9 is open.
• the shut-off device 1.5 can be operated automatically or manually.
• the shut-off device 1.5 can be operated electrically (not shown in the figures) or pneumatically (see Figures 3 and 4 ) is controllable.
• the pinch valve 1.5 is preferably made of solvent-resistant rubber.
• the material conveyor 1 also comprises an inlet valve 7, which has a valve inlet 7.1 and a valve outlet 7.9 and a valve plate 7.7 in between. In the closed state, the valve plate 7.7 sits on the valve seat 7.2.
• the inlet valve 7 is preferably designed as a self-closing valve.
• the inlet valve 7 can have a return spring 7.8 (see Figure 2 ), which ensures that the inlet valve 7.7 in the pressure-free state is closed. It is also advantageous if the inlet valve 7 is designed as a check valve.
• the inlet valve 7 is preferably installed in the material conveyor 1 in such a way that it closes the conveyor inlet 1.1 when the first conveyor chamber 1.11 is under pressure.
• the inlet valve 7 ensures that the coating material 31 can only flow in one direction, namely in the direction of the spray applicator 45.
• the inlet valve 7 is preferably designed such that it has the smallest possible dead space. This has the advantage that only a small amount of coating material can deposit there, so that the risk of color carryover during a color change is minimized.
• the inlet valve 7 is preferably designed as a poppet valve because a poppet valve has a particularly small dead space.
• the flushing agent inlet 1.2 is connected to the valve inlet 7.1 even when the inlet valve 7 is closed.
• the conveyor inlet 1.1 When the shut-off device (pinch valve) 1.5 is open, the conveyor inlet 1.1 is connected to the valve inlet 7.1. When the pinch valve 1.5 is closed, the conveyor inlet 1.1 is not connected to the valve inlet 7.1. Therefore, the pinch valve 1.5 can connect the conveyor inlet 1.1 to the valve inlet 7.1.
• the material conveyor 1 also has a rinsing agent inlet 1.2 for a rinsing medium / rinsing agent 30.
• rinsing agent 30 can be sucked from a storage container 20 via a rinsing line 32 and fed via a rinsing line 33, a check valve 24, a flushing line 34, a check valve 8, and a flushing line 35 to the valve inlet 7.1.
• the flushing medium can be, for example, solvent, water, air, or a mixture thereof.
• the check valve 8 is preferably arranged in the immediate vicinity of the valve inlet 7.1 (see Figure 2 ). It comprises an inlet 8.1 and an outlet 8.9, with a valve plate 8.7 between them.
• the inlet 8.1 of the check valve 8 simultaneously forms the flushing agent inlet 1.2 of the material conveyor 1.
• the check valve 8 is preferably designed to be self-closing. It can also have a return spring 8.8, which ensures that the check valve 8 is closed in the depressurized state.
• the material conveyor 1 also includes a second conveyor chamber 1.12, which is connected or connectable to the first conveyor chamber 1.1 via a check valve 1.14.
• a second conveyor chamber 1.12 which is connected or connectable to the first conveyor chamber 1.1 via a check valve 1.14.
• a filter 44 can be located between the material line 42 and the material line 43. The coating material can be drained into the residue container 21 or back into the storage container 22 via a drain valve 41.
• a controller 2 can be provided to control the material conveyor 1 and the rinsing agent conveyor 3.
• the controller 2 has a control valve 13, which is connected on the inlet side via a Line 39 and a shut-off valve 11 are connected to a compressed gas source 10.
• the compressed gas source 10 provides a compressed gas at a defined pressure.
• the compressed gas can be, for example, compressed air or nitrogen.
• the control valve 13 When the control valve 13 is open, the compressed gas flows via a control line 36 to the control inlet 1.6 of the pinch valve 1.5.
• the controller 2 further comprises a compressed gas valve 14, which is connected to the compressed gas source 10 on the inlet side via a flow reducer 18, a compressed gas valve 12, and the shut-off valve 11.
• a compressed gas valve 14 When the compressed gas valve 14 is actuated, compressed gas is fed into the purge line 34 via a flow reducer 17, a compressed gas line 37, and a check valve 23.
• the flow reducer 17 can be, for example, a throttle or an orifice.
• the flow reducer 18 is provided to regulate the mass flow of the compressed gas.
• the compressed gas valve 12 serves as a safety valve to prevent the system operator from accidentally activating one of the valves 14, 15, or 16, which could cause flushing medium to enter the material conveyor 1 during conveying operation. Only after the compressed gas valve 12 has been activated can the system switch to cleaning mode.
• the compressed gas valve 12 is optional.
• the control unit 2 also has a compressed gas valve 15, which is connected to the compressed gas source 10 on the inlet side via the flow reducer 18, the compressed gas valve 12 and the shut-off valve 11.
• a compressed gas valve 15 When the compressed gas valve 15 is actuated, compressed gas is supplied via the compressed gas line 37 and the check valve 23 into the flushing line 34.
• compressed gas valve 14 When the compressed gas valve 14 is actuated, compressed gas is introduced into the purge line 34 at a first pressure or compressed gas volume flow V ⁇ 1. However, when the compressed gas valve 15 is actuated, compressed gas is introduced into the purge line 34 at a second pressure or compressed gas volume flow V ⁇ 2.
• the control system 2 also has a flow valve 16, which is connected to the compressed gas source 10 on the inlet side via the compressed gas valve 12 and the shut-off valve 11.
• a flow valve 16 When the flow valve 16 is actuated, compressed gas is supplied to the rinsing agent conveyor 3 via a compressed gas line 38 and a flow reducer 25 to drive it.
• the control 2 also comprises a cam control 60, with which the valves 13, 14, 15 and 16 can be actuated.
• the principle of a possible embodiment of the cam control 60 is shown in Figure 5.
• the cam control 60 has a camshaft 61 rotatable about its longitudinal axis with a plurality of cams, wherein Figure 5 only the cams 61.1, 61.2,... 61.8 are visible.
• the camshaft 61 can be rotated to seven different positions 0 - 6 (see arrow). When the camshaft 61 is in position 0, the delivery device enters the delivery mode. In position 0, the cams do not actuate the control valve 13, any of the pressure gas valves 14 and 15, or the flow valve 16. The valves 13 - 16 are closed.
• camshaft 61 For example, if camshaft 61 is moved to position 4, the compressed gas valve 15 and the flow valve 16 are actuated via cam 61.7. This opens valves 15 and 16. Furthermore, the control valve 13 is actuated (opened) via cam 61.6. In position 2, the control valve 13 and the compressed gas valve 15 are actuated (opened) by cams 61.2 and 61.4. In position 1, the compressed gas valve 14 is actuated by cam 61.3.
• the coating material conveyor 1 has a conveyor chamber inlet 1.13, which is connected to a flushing agent control valve 51 via a flushing agent line 48 and a check valve 47.
• the flushing agent inlet 1.2 is also connected to the flushing agent control valve 51.
• the control valve 13 now controls (unlike in Figure 3 ), whether the delivery chamber inlet 1.13 or the flushing inlet 1.2 is supplied with flushing agent 30 via the flushing agent control valve 51.
• the system operator turns the rotary knob 71 (see Figure 6 ) on the control panel 70 until the rotary knob 71 points to the spray gun pictogram 72.
• the camshaft 61 connected to the rotary knob 71 is then in position 0.
• the application system is now in feed mode. As soon as the system operator pulls the trigger on the spray applicator 45, the coating material 31 is sprayed.
• the camshaft 61 of the cam control 60 causes the valves 13, 14, 15, and 16 to be locked.
• no compressed gas enters the control line 36 and the compressed gas lines 37 and 38.
• the shut-off device (pinch valve) 1.5 is open, allowing coating material 31 to reach the valve inlet 7.1 via the coating material supply line 9.
• the piston 1.4 now moves upward, the coating material 31 is sucked from the reservoir 22 and drawn via the supply line 9, the inlet 1.1, the valve inlet 7.1, and through the inlet valve 7 into the first delivery chamber 1.11.
• the check valve 1.14 is closed, i.e., blocked.
• the coating material already in the second feed chamber 1.12 is pushed out of the second feed chamber 1.12 by the piston 1.4 and transported via the material line 42, the filter 44, and the material line 43 to the spray applicator 45.
• the inlet valve 7 closes, so that the first feed chamber 1.11 is closed on the inlet side.
• the coating material 31 is pushed from the first feed chamber 1.11 through the check valve 1.14 into the second feed chamber 1.12.
• the piston 1.4 then moves upward again, and the process described above repeats.
• the conveying device can be operated with different pressures, such as pump pressure, spray pressure, circulation pressure, Filling pressure and/or cleaning pressure can be set or regulated.
• the pump pressure is the pressure at which the coating material 32 is present at the conveyor outlet 1.3. It can be adjusted in conveyor mode.
• the spray pressure is the pressure at which the coating material 31 is sprayed onto the workpiece.
• the circulation pressure is the pressure at which the material 31 is circulated via a drain valve in the conveyor device. The circulation pressure is generally lower than the spray pressure.
• the filling pressure is the pressure at which the material conveyor 1 is filled with coating material 31. The filling pressure is generally lower than the spray pressure.
• the cleaning pressure is the pressure of the rinsing medium with which the material conveyor 1 is to be cleaned (before switching to cleaning mode). The cleaning pressure is normally lower than the spray pressure.
• the system operator turns the rotary knob 71 on the control panel 70 to the cleaning position (position 1).
• the compressed gas valve 14 is actuated by the cam 61.3 of the camshaft 61 and opened. This causes compressed gas to flow via the compressed gas valve 14, the flow reducer 17, the purge line 37, and the check valve 23 into the purge line 34.
• the compressed gas in the purge line 34 has a throttled volume flow V ⁇ 1. From there, it flows via the check valve 8 into the purge line 35 and to the valve inlet 7.7.
• the closing force of the return spring 7.8 on the inlet valve 7 is preferably so large that the inlet valve 7 remains closed even when gas pressure is applied.
• the pinch valve 1.5 is open, the compressed gas transports the coating material back into the supply line 9 and ultimately reaches a residual agent container 21. In this way, the valve inlet 7.1, the pinch valve 1.5, the conveyor inlet 1.1, and the supply line 9 are emptied.
• the control valve 13 When the system operator moves the rotary knob 71 to position 2, the control valve 13 is opened by the cam 61.2, so that compressed air reaches the control connection 1.6 and the shut-off device 1.5 closes the channel 1.9.
• the compressed gas valve 15 is actuated and opened by the cam 61.4.
• compressed gas with the second compressed gas volume flow V ⁇ 2 flows from the compressed gas source 10 via the compressed gas valve 15 and the compressed gas line 37 into the purge line 34.
• the inlet valve 7 opens, since the pressure in the compressed gas is greater than the restoring force of the return spring 7.8 in the inlet valve 7.7.
• the purge gas thus reaches the first delivery chamber 1.11. From there, the purge gas flows via the check valve 1.14 into the second conveying chamber 1.12 and then into the material hoses 42 and 43 up to the spray applicator 45. The remaining coating material is sprayed out via the spray applicator 45.
• the drain valve 46 on the spray applicator 45 can be opened so that the remaining coating material can be drained via a line 49 into the residue container 21 or back into the storage container 22. Once the rinsing process is complete, the drain valve 46 is closed again.
• the drain valve 41 on the filter 44 can be opened so that the remaining coating material can be drained via a line into the residue container 21 or back into the storage container 22. Once the rinsing process is complete, the drain valve 41 is closed again.
• valves 14 and 16 are actuated and opened by the cams 61.1 and 61.8 of the camshaft 61.
• compressed gas with the first compressed gas volume flow V ⁇ 1 flows from the compressed gas source 10 via the compressed gas valve 14, the flow reducer 17 and the compressed gas line 37 into the purge line 34.
• the purge pump 3 is driven by the compressed gas, which flows via the flow valve 16 and the line 38 to the purge pump 3.
• This pump then pumps purge 30 from the Detergent container 20 into the detergent lines 33 and 34 and from there via the check valve 8 into the detergent line 35.
• the detergent then reaches the valve inlet 7.1 via the rinse inlet 1.2.
• the closing force of the return spring 7.8 on the inlet valve 7 is preferably so great that the inlet valve 7 remains closed even when the flushing agent pressure is applied. Because the pinch valve 1.5 is open, the supply line 9 is flushed with the help of the compressed gas and the flushing agent, ultimately reaching a residual agent container 21. In this way, the valve inlet 7.1, the pinch valve 1.5, the conveyor inlet 1.1, and the supply line 9 are flushed.
• the cams 61.6 and 61.7 of the camshaft 61 actuate the valves 13, 15 and 16 and open them. This causes compressed gas to flow via the control valve 13 and the line 36 to the control inlet 1.6 of the pinch valve 1.5, closing the pinch valve 1.5. Furthermore, compressed gas with the volume flow V ⁇ 2 flows from the compressed gas source 10 via the compressed gas valve 15 and the compressed gas line 37 into the purge line 34. Furthermore, the purge pump 3 is driven by the compressed gas, which flows via the flow valve 16 and the line 38 to the purge pump 3. This pump then pumps purge 30 from the purge container 20 into the purge line 32. Flushing agent lines 33 and 34 and from there via the check valve 8 into the flushing agent line 35.
• the flushing agent then flows via the flushing inlet 1.2 to the valve inlet 7.1.
• the inlet valve 7 opens because the pressure in the compressed gas (flushing gas) and flushing agent is greater than the return force of the return spring 7.8 in the inlet valve 7.7.
• the mixture of flushing gas and flushing agent (flushing medium) thus reaches the first conveying chamber 1.11. From there, the mixture flows via the check valve 1.14 into the second conveying chamber 1.12 and then into the material hoses 42 and 43 up to the spray applicator 43.
• the flushing medium is thus sprayed out via the spray applicator 45.
• the drain valve 46 on the spray applicator 45 can be opened so that the rinsing medium can be drained via line 49 into the residue container 21 or back into the storage container 22. Once the rinsing process is complete, the drain valve 46 is closed again.
• the drain valve 41 on the filter 44 can be opened so that the rinsing gas and rinsing agent can be drained via a line into the residue container 21 or back into the storage container 22. Once the rinsing process is complete, the drain valve 41 is closed again.
• the purge gas thus reaches the first delivery chamber 1.11. From there, the purge gas flows via the check valve 1.14 into the second conveying chamber 1.12 and then into the material hoses 42 and 43 up to the spray applicator 45. The remaining The detergent present is sprayed out via the spray applicator 45.
• the drain valve 46 on the spray applicator 45 can be opened so that the remaining rinsing agent can be blown out via line 49. This allows the pressure stage 1.8 and the lines 42, 43 and components located downstream of the pressure stage to be dried. Once the drying process is complete, the drain valve 46 is closed again.
• Rinsing or drying can be performed in pulsed or continuous mode. Using compressed air as the rinsing medium, the solvent residues in material conveyor 1 are blown out.
• a throttle 26 (see Figure 4 ) between the The flushing agent pump 3 and the check valve 24 are installed.
• the throttle 26 is optional. This also allows the flushing agent flow to be throttled so that not too much flushing agent 30 flows into the flushing line 34. This allows the flow reducer 19, which is designed, for example, as a pressure control valve, to better adjust the supply of flushing gas into the flushing line 34.
• the throttle 26 allows the flushing agent in the flushing line to be atomized into fine droplets, thereby achieving better mixing of the flushing gas and the flushing agent.
• the first conveying chamber 1.11 and preferably also the second conveying chamber 1.12 are emptied before rinsing. This can be done, for example, by opening the drain valve 41 and moving the piston 1.4 up and down several times. This drains most of the coating material still present in the two conveying chambers 1.11 and 1.12 through the drain valve 41.
• the first conveying chamber 1.11 and preferably also the second conveying chamber 1.12 are dried after flushing.
• the drain valve 41 is opened and compressed gas is blown through the conveying chambers 1.11 and 1.12.
• the shut-off device 1.5 is opened.
• the flushing agent introduced via the flushing inlet 1.2 now flows through the intake tract 1.7 toward the supply line 9.
• shut-off device 1.5 When closed, the shut-off device 1.5 allows the flushing agent pressure required for cleaning the compressor stage 1.8 to be built up by preventing the flushing agent from escaping through the supply line 9.
• shut-off device 1.5 When opened, the shut-off device 1.5 allows the detergent to be directed towards the supply line 9 in order to clean it.
• the coating material still in the application system can be recovered by displacing the coating material from the system using compressed gas.
• the cleaning process may also include the following process steps.
• the supply line 9 is removed from the material storage container 22 and directed into the residue container 21. This ensures that no rinsing agent enters the material storage container 22 when flushing the intake tract 1.7 and the supply line 9.
• the material conveyor 1 can also be emptied by activating the spray applicator 45 and moving the piston 1.4 up and down. This causes the remaining coating material to be discharged via the conveyor outlet 1.3 and sprayed via the spray applicator 45.
• the coating material conveyor 1 and the upstream components can be flushed with a gas-solvent mixture.
• the addition of gas can reduce solvent consumption.
• the material conveyor 1 remains filled with flushing agent 30 until the next use (conveying coating material).
• the material conveyor 1 After the material conveyor 1 and the respective lines no longer contain any rinsing agent 30 and have been dried if necessary, the material conveyor 1 be refilled with coating material 31. For this purpose, several piston strokes are performed to convey the coating material 31 into the conveying chambers 1.11 and 1.12. The material conveyor 1 is then ready to convey coating material 31 to the applicator 45.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Coating Apparatus (AREA)
• Spray Control Apparatus (AREA)

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Citations (4)

• 2024
  • 2024-03-14 EP EP24163689.3A patent/EP4616959A1/fr active Pending
• 2025
  • 2025-03-06 US US19/071,952 patent/US20250289018A1/en active Pending
  • 2025-03-12 CN CN202510288660.2A patent/CN120644342A/zh active Pending

Patent Citations (4)

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