EP3641947A1

EP3641947A1 - Spray nozzle for a spray tool

Info

Publication number: EP3641947A1
Application number: EP18773337.3A
Authority: EP
Inventors: Björn Wollin
Original assignee: Wollin GmbH
Current assignee: Wollin GmbH
Priority date: 2017-09-14
Filing date: 2018-09-11
Publication date: 2020-04-29
Anticipated expiration: 2038-09-11
Also published as: WO2019052601A1; US11161131B2; ES2847415T3; KR102277390B1; HUE053580T2; PL3641947T3; KR20200052365A; US20200206762A1; DE102017121274B3; EP3641947B1; SI3641947T1

Abstract

A spray nozzle (1) has a dosing space (10) inside a nozzle housing (2), in which dosing space a release agent can be introduced, the volume of the dosing space (10) being variable by means of a dosing element (9). An active bleed unit is integrated into the spray nozzle (1) and can be adjusted automatically from a deactivated position to a bleed and open position via an actuation variable.

Description

Spray nozzle for a spray tool

The invention relates to a spray nozzle for a

Spray tool for spraying a release agent into a mold according to the preamble of claim 1.

Such a spray nozzle is described in DE 10 2008 035 632 B4. The spray nozzle has a metering chamber in a nozzle housing into which a separating agent is insertable, wherein the volume of the metering chamber can be changed via a discharge piston. Upon actuation of the ejection piston, the release agent is displaced from the dosing and over a

Outlet channel led to a nozzle body, which is provided with an outwardly open cup, in which the

Release agent is supplied before discharging spray air.

In the dosing empties a vent channel to the

Venting a gas volume in the dosing serves.

For further prior art, reference is made to EP 0 724 486 B1, DE 196 14 957 A1, DE 22 04 942 B and DE 10 2004 020 205 A1. The invention has for its object to effectively vent a spray nozzle for a spray tool with simple measures.

This object is achieved according to the invention with the features of

Claim 1 solved. The dependent claims give appropriate

Further education.

The spray nozzle according to the invention, which is used in a spray tool for applying a release agent in a cavity or a surface of a mold, has in one

Nozzle housing on a metering, in which a release agent, such as oil, is insertable. The volume of the dosing can be changed via a dosing of the spray nozzle, wherein a volume reduction of the dosing a displacement of the release agent, in particular the same volume, from the

Dosing causes.

The metering member is as a metering or ejection piston

formed in the direction of its piston longitudinal axis a

Can perform adjusting movement.

The displaced from the dosing by the adjusting movement of the dosing release agent is in the regular, proper

Operation via a discharge channel to a nozzle body

passed over the release agent from the nozzle housing

is discharged. Optionally, the release agent is a

Supplied spray, in particular spray air to the

Release agent in a spray from the nozzle body

to bring out.

In the spray nozzle, an active ventilation unit is integrated, which serves for venting the metering chamber and optionally the associated with the dosing chamber discharge channel. The Venting is in the case of air accumulation in the dosing chamber or in the

Drainage channel required, which is an ejection of the

Prevent release agent or at least complicate it. Due to the compressibility of the air in the dosing the adjusting movement of the dosing is not or only partially in one

Displacement movement of the release agent implemented. For proper operation, therefore, venting is required in the event that air has accumulated in the dosing space.

The venting takes place via the active ventilation unit by the ventilation unit with an actuation size

is acted upon, whereupon the venting unit automatically from a non-functional position in a vent and

Opening position is adjusted. The venting unit or a component actuated by the venting unit is without proper operation of the spray nozzle

Air accumulation in the dosing of the release agent in the

Venting and opening position adjusted so that the

Release agent can pass through the venting unit. When air has accumulated in the dosing chamber, the venting unit or a component actuated by the venting unit can be automatically adjusted to the venting and opening position by being acted upon with the actuating variable in which the dosing chamber is vented. After completion of the vent, the ventilation unit is again by the venting and

The opening position is returned to the non-functional position, whereupon the proper functioning of the spray nozzle is restored and the regular operation of the spray nozzle can be resumed.

Due to the active design of the venting unit is a manual opening and closing to perform the

Bleeding process not required. The deaerator is acted upon by the Aktuierungsgröße, the carrier of the Adjustment energy for transferring the venting unit from the non-functional to the venting and opening position and controls the movement of the venting unit. The

Transfer in the opposite direction - from the vent to the non-functional position - either also takes place in an active manner by acting on the vent unit with the

Aktuierungsgröße or in a passive manner by a permanently acting on the venting unit and this is applied in the direction of the non-functional position acting force, for example, the spring force of a spring element or the weight of the venting unit or other

Component that acts on the venting unit. The adjustment of the ventilation unit from the non-functional to the

Venting and opening position is performed by the

Actuating size opposite to that in the direction of

Non-functional position acting restoring force.

Venting of the spray nozzle is either manually initiated by manually adjusting the actuator size so that the venting unit moves from the non-functional to the venting and opening positions. Alternatively, an automatic adjustment of the comes

Entlüftungsseinheit of the non-functional in the vent ^¬ and opening position into consideration by sensory a

System size is monitored, for example, the pressure of

Release agent in the region of the nozzle body or in the

Discharge channel, and depending on the size of the system size, the ventilation unit by acting on the

Actuating size is automatically adjusted. As a system size comes, for example, an optical monitoring of

Spraying the release agent from the nozzle body into consideration, wherein the venting unit is actuated, if it is visually determined that the release agent is not or not sprayed in the desired manner. According to an advantageous embodiment, the Aktuierungsgröße the venting unit with the Aktuierungsgröße of

Dosing identical, the volume change of the dosing and the ejection of the release agent from the dosing

is used. The actuator size is, for example, pressurized control air with which both the dosing member and the venting unit

be charged. It is possible to supply the control air for the dosing member and the venting unit via a common control air line of the spray nozzle. Alternatively, it is also possible to supply control air for the dosing and control air for the ventilation unit via separate control air lines.

The control air is under pressure, being below a

Threshold only the dosing member and above a compressed air threshold both the dosing member and the venting unit are adjusted.

Advantageously, there is a lower compressed air threshold and a higher, upper compressed air threshold, which are for example 6 bar and 8 bar, below the lower compressed air threshold only the dosing and above the upper compressed air threshold both the dosing and the venting unit

be adjusted. This procedure has the advantage that in regular operation with the ventilation unit in the

Inoperative position, the operation of the dosing member via the compressed air is applied with a control pressure corresponding to the lower compressed air threshold, whereas for the venting only the pressure of the control air must be increased to the upper compressed air threshold to the

Venting unit in the venting and opening position to adjust. Due to the pressure difference between the lower and upper compressed air threshold, a safety distance is guaranteed and accidental, unintentional activation of the ventilation unit is excluded.

By both the dosing and the venting unit are adjusted to perform the vent is

ensures that the operation of the dosing the volume of air from the dosing on the way over the nozzle body despite the high compressibility of the air in the dosing

is ejected.

There are also other actuation variables for the

Venting unit into consideration. The Aktuierungsgröße can for example also be an electric current with which an electric ventilation unit, for example, designed as an electromagnetic actuator, is acted upon. The dosing member may optionally be electrically operated

be educated. Alternatively, a hydraulic actuation of the venting unit and / or the metering member is considered.

Advantageously, for the dosing and the

Venting unit uses the same Aktuierungsgröße. In an alternative embodiment, it is also possible different Aktuierungsgrößen for the dosing and the

Use venting unit, for example, control air for the dosing and electrical power or hydraulic pressure for the venting unit.

According to a further advantageous embodiment is in the

Ableitungskanal arranged a check valve, which represents an operable by the venting unit for venting component and from the venting unit of a

Locking position can be adjusted in an open position. The check valve thus remains for the duration of the vent in the open position in which the air in the metering chamber and optionally remaining release agent are discharged from the metering via the discharge channel and the nozzle body. Also in regular operation of the spray nozzle, in which the

Venting unit is in the non-functional position, the check valve is adjusted with the ejection of the release agent in the open position. After completion of the ejection process - both in normal operation and during venting - the check valve returns to the locked position, in which the discharge channel is locked.

The check valve comprises, according to an advantageous

Execution, a check ball, which is arranged in the discharge channel and in the discharge channel between barrier and

Opening position is adjustable.

The venting unit is, according to further advantageous

Execution, designed as a vent piston, which is axially adjustable along its longitudinal axis between the non-functional position and the venting and opening position. In normal operation without air in the dosing is the

Bleed pistons in the axially retracted

Inoperative position. With the actuation of the

Venting piston, in particular by control air, the pressure is above an upper compressed air threshold, the vent piston is axially displaced from the non-functional position to the venting and opening position and pushes the check valve, in particular the check ball from the lock to the open position, the check valve for the duration of the ventilation. To terminate the venting, the actuation of the venting piston is advantageously stopped, whereupon the venting piston returns, for example, by its own weight in the non-functional position. It is also possible to adjust the vent piston by spring force in the non-functional position. Furthermore, it is possible to carry out the actuation in such a way that the vent piston for terminating the vent in the

Non-functional position returns.

It may be appropriate, in addition, a manual

Provide venting possibility for the spray nozzle. In this case, a bypass is opened manually to the dosing to

vent.

The dosing of the dosing can, according to further

advantageous embodiment, by means of an actuating element

can be adjusted, for example, is designed as a set screw which is screwed into the housing and can be adjusted from the outside. The end face of the adjusting screw forms a contact and support surface for the dosing member whose starting position depends on the position of the adjusting screw. In an adjusting movement of the actuating element, the volume of the metering chamber is changed.

Further advantages and expedient embodiments can be taken from the further claims, the description of the figures and the drawings. Show it:

1 is a perspective view of a spray nozzle for a

Spray tool for spraying a release agent via a nozzle body,

2 shows the spray nozzle of FIG. 1 in a view from below,

3, the spray nozzle in plan view, 4 shows a section through the spray nozzle according to section line A-A from FIG. 3, with a dosing member in the spray nozzle, with which the release agent is ejected, shown in the initial position of the dosing member,

Fig. 5 is a Fig. 4 corresponding representation, but with the

Dosing member in the deflected displacement position,

Fig. 6 is a further plan view of the spray nozzle with

registered section line,

7 shows a section along section line B-B of FIG. 6, with a ventilation unit in non-functional position,

Fig. 8 is a view according to FIG. 7 with the

Venting unit in venting and

Opening position,

Fig. 9 is a view of the spray nozzle from below with registered

Cutting lines,

Fig. 10 is a section along section line M-M of FIG. 9 with

a representation of the dosing and with a check valve in the input region of the release agent,

Fig. 11 is a section along section line N-N of Fig. 9 with

a representation of the work space and the

Inlet opening for the control air.

In the figures, the same components are provided with the same reference numerals.

In Figs. 1 and 2 is a perspective spray nozzle for

Spraying a release agent, such as oil, in the Cavity or shown on the surface of a mold. The spray nozzle 1, which may be part of a spray tool, has a nozzle housing 2, from which a nozzle body 3 protrudes, which is designed as a ball nozzle body and is mounted in a corresponding ball joint in the nozzle housing 2, whereby the ball nozzle body 3 a rotational movement about up to three axes of rotation can perform. About the nozzle body 3, the spraying of the release agent in the form of a

Spray mist in the exit direction 4.

As can be seen from the perspective view of the spray nozzle 1 according to FIG. 2, there are several at the bottom

Inlets 5 to 8, are introduced via the various media in the spray nozzle 1. Spray air is introduced via an inlet opening 5 which is mixed with the separating agent to produce a spray which exits via the nozzle body 3. The mixing of spray air and release agent takes place either in an open-to-the-mouth bowl 18 in the nozzle body 3 or already upstream of the nozzle body 3 in a line 19 through which the release agent is supplied to the nozzle body 3.

About a further inlet opening 6 release agent is introduced into the interior of the nozzle housing 2. Furthermore, two further inlet openings 7 and 8 are arranged over the

Control air is introduced into the spray nozzle 1, which is under pressure and used for the motion control of both a dosing member for the change of the volume of the release agent to be ejected and for the motion control of a venting unit in the spray nozzle.

4 and 5 are a sectional view according to the

Section line A-A of Fig. 3 and show a longitudinal section through the nozzle housing 2 of the spray nozzle 1. Shown is a

Dosing member 9 in the nozzle housing 2, which in Fig. 4 in the Starting position and in Fig. 5 is shown in the displacement position and is used to displace the release agent from a metering chamber 10 via a discharge channel 11 to the nozzle body 3. The metering member 9 is formed as a metering piston 9, the piston tip limits the metering chamber 10, so that an axial displacement - based on the

Piston longitudinal axis - the metering 9 to one

Volume reduction of the metering chamber 10 and corresponding to a release agent displacement of the same volume from the metering chamber 10 in the direction of the nozzle body 3 leads. The metering piston 9 is mounted axially displaceably in a working space 12 in the nozzle housing 2. In the area above the metering piston 9 control air, which is under a working or control pressure of, for example, 6 bar, passed into the working space 12, whereupon the metering 9 a working movement of the

Starting position shown in FIG. 4 in the displacement position shown in FIG. 5. This working movement takes place counter to the spring force of a spring element 13 (FIG. 4), which is in the

Nozzle housing 2 is supported and the metering 9 in the

Strengthened starting position. After completion of the

Aussprühvorganges is the pressure of the control air in the upper

Section of the working chamber 12 is reduced above the metering piston 9, whereupon the metering piston 9 returns by the force of the spring element 13 back to the starting position.

The volume of the dosing chamber 10 can be determined by means of a

Adjusting screw 21 (Fig. 4) are set, the one

Stellelement forms. The adjusting screw 21 can be adjusted from the outside, so that changes the position of the screw 21 in the housing. The end face of the adjusting screw 21 forms a contact and support surface for the metering piston 9, whose starting position depends on the position of the adjusting screw 21. Figs. 7 and 8 show a further section through the

Spray nozzle 1 along the section line B-B of Fig. 6. The

Section is angularly offset with respect to the sectional view of FIGS. 3 to 5. In Fig. 7 and 8, a venting unit 14 is shown, which serves to the metering chamber 10 and

if appropriate, also vent the discharge channel 11 in the event that air in the dosing space 10 or in the

Ableitungskanal 11 has accumulated. In this case, a regular operation of the spray nozzle with spraying release agent is not possible because due to the high compressibility of the air in the dosing the movement of the metering 9 does not lead to an ejection of the release agent, but substantially only to a compression of the gas volume.

The venting unit 14 is as a vent piston

formed, which is arranged offset in the nozzle housing 2 to the metering, wherein the longitudinal axes of metering piston and vent piston 14 parallel to each other. The

Venting piston 14 is axially adjustable between the inoperative position shown in Fig. 7 and the venting and opening position shown in Fig. 8. The top of the

Venting piston 14 faces a check valve 15 in the form of a check ball, which in the flow path of the

Release agent from the dosing chamber 10 to the nozzle body 3 in one

Section IIa of the discharge channel 11 is arranged. The

Check ball 15 is adjustable between a locking position and an open position, wherein in the locked position (Fig.

7) an outflow of release agent or air through the

Ableitungskanal 11 prevents and in the open position (Fig.

8) is enabled.

In the regular mode of operation - without air in the metering chamber 10 - is the working movement of the metering 9, the

Release agent via the discharge channel 11 and the nozzle body. 3 pushed out. Here, the check ball 15 is lifted from the locked position shown in FIG. 7 in the open position shown in FIG. The opening position is above the

Locking position. After completion of the ejection operation, the check ball 15 returns spring-actuated from the open position back to the locked position.

In the regular mode of operation is the

Venting piston 14 in the retracted position shown in FIG. 7, in which the vent piston 14 has no influence on the movement of the check ball 15. In the

Transfer of the vent piston 14 from the

8 in the venting and opening position shown in FIG. 8, the vent piston is raised, whereby the tip of the vent piston, the check ball 15 from the locked position in the

Opening position presses, in which the flow path is released through the discharge channel 11. During a working movement of the metering piston 9, the free volume of the metering chamber 10 is reduced and the air contained in the metering chamber 10 and optionally in the discharge channel 11 over the now open

Ableitungskanal 11 and the nozzle body 3 ejected. The venting process is completed when the metering 9 returns to its original position and the vent piston 14 returns to its non-functional position.

The lifting of the vent piston 14 of the

In the venting and opening position shown in FIG. 8 takes place using the control air The vent piston 14 is in a working space 16 in the

Nozzle housing 2 slidably mounted. In the region of the working space 16 at the bottom of the vent piston 14 control air can be introduced, which is a lifting of the Venting piston 14 causes from the non-functional position in the venting and opening position.

The raising of the venting piston 14 depends on the level of the pressure of the control air at the bottom of the venting piston. Advantageously, the control air has an upper

Reach or exceed compressed air threshold, for example, 8 bar, so that the vent piston 14 is raised. This compressed air threshold is in particular above the regular pressure of, for example, 6 bar, with the

Metering 9 in normal operation against the force of

Spring element 13 is acted upon. The pressure difference

between the regular control pressure for the normal

Operations of the spray nozzle (lower compressed air threshold value) and the increased upper compressed air threshold for the lifting of the vent piston 14 in the venting ^¬ and opening position ensures that remains in its underlying inoperative position during the regular operation of the vent piston fourteenth Also in regular operation, the bottom of the vent piston 14 with a

Control pressure applied, but not high enough to lift the vent piston and adjust to the venting and opening position. Only with the exceeding of the upper compressed air threshold value of the vent piston 14 is moved to the venting and opening position.

After completion of the venting process, the pressure of the control air is reduced again, whereupon the vent piston 14 by the force of a spring element 20 from the raised venting and opening position in the underlying

Out of function position is adjusted. Then the regular operation of the spray nozzle can be resumed. In Fig. 10 is a section through the spray nozzle 1 according to

Section line M-M of Fig. 9 and in Fig. 11 is a section through the spray nozzle 1 according to section line N-N shown in FIG. 9. The cuts are made through the inlet opening 6 for the separating means (FIG. 10) and the inlet opening 7 for the control air (FIG. 11). The release agent is passed via the inlet opening 6 via a check valve 17 in the metering chamber 10. The control air is via the inlet opening 7 - and via the further inlet opening 8 - in the working space 12 above the metering piston 9 and in the working space 16 below the

Venting piston 14 passed.

Claims

claims

1. Spray nozzle for a spraying tool for spraying a

Release agent in a mold, wherein in a nozzle housing (2) of the spray nozzle (1) is introduced a metering chamber (10) into which the release agent is insertable, and the volume of the metering chamber (10) via a metering member (9) is variable, wherein a

Volume reduction of the metering chamber (10) causes a displacement of the release agent of the same volume from the metering chamber (10) and from the metering chamber (10) by the adjusting movement of the metering member (9) displaced release agent via a

Discharge channel (11) is guided to a nozzle body (3) over which the release agent is to be discharged from the nozzle housing (2), characterized

that in the spray nozzle (1) an active ventilation unit (14) for venting the metering chamber (10) is integrated, wherein the venting unit (14) by applying a

Aktuierungsgröße is automatically adjustable from a non-functional position in a venting and opening position.

2. Spray nozzle according to claim 1,

characterized,

the actuation variable of the venting unit (14) is identical to an actuation variable of the dosing member (9) for changing the volume of the dosing chamber (10).

3. Spray nozzle according to claim 1 or 2,

characterized,

the ventilation unit (14) can be activated when a threshold value of the actuation variable is exceeded.

4. Spray nozzle according to one of claims 1 to 3,

characterized,

in that the actuation variable of the ventilation unit (14) is pressurized control air.

5. Spray nozzle according to claim 2, 3 and 4,

characterized,

that the control air for the metering member (9) and the

Venting unit (14) is supplied via a common control air line.

6. Spray nozzle according to claim 2, 3 and 4 or 5,

characterized,

that below a compressed air threshold only the

Dosing member (9) and above a compressed air threshold both the dosing (9) and the venting unit (14) is adjustable.

7. Spray nozzle according to one of claims 1 to 6,

characterized,

a check valve (15) is arranged in the discharge channel (11) and the venting unit (14) is arranged in the

Venting and opening position, the check valve (15) opens.

8. Spray nozzle according to claim 7,

characterized, in that the check valve (15) comprises a check ball in the discharge channel (11).

9. Spray nozzle according to one of claims 1 to 8,

characterized,

in that the venting unit (14) is designed as a venting piston, which along its longitudinal axis between the non-functional position and the venting and

Opening position is axially adjustable.

10. Spray nozzle according to one of claims 1 to 9,

characterized,

that the venting unit (14) by the force of a

Spring element (20) is acted upon in the non-functional position.

11. Spray tool with a spray nozzle (1) according to one of claims 1 to 10.