EP3335805B1 - Distributeur piézoélectrique à jet - Google Patents

Distributeur piézoélectrique à jet Download PDF

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Publication number
EP3335805B1
EP3335805B1 EP16205111.4A EP16205111A EP3335805B1 EP 3335805 B1 EP3335805 B1 EP 3335805B1 EP 16205111 A EP16205111 A EP 16205111A EP 3335805 B1 EP3335805 B1 EP 3335805B1
Authority
EP
European Patent Office
Prior art keywords
contact element
jetting dispenser
dispenser according
actuation lever
force
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.)
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Application number
EP16205111.4A
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German (de)
English (en)
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EP3335805A1 (fr
Inventor
Lothar Hentschel
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.)
Nordson Corp
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Nordson Corp
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
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Priority to EP16205111.4A priority Critical patent/EP3335805B1/fr
Priority to PCT/US2017/066692 priority patent/WO2018118686A1/fr
Publication of EP3335805A1 publication Critical patent/EP3335805A1/fr
Application granted granted Critical
Publication of EP3335805B1 publication Critical patent/EP3335805B1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0225—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work characterised by flow controlling means, e.g. valves, located proximate the outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
    • B05C11/1034—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves specially designed for conducting intermittent application of small quantities, e.g. drops, of coating material

Definitions

  • the invention relates to a jetting dispenser comprising a fluid chamber, a fluid inlet to the fluid chamber, a fluid outlet from the fluid chamber, and a valve seat position between the fluid inlet and the fluid outlet, a valve element, a piezoelectric drive assembly configured to reciprocally move at least a portion of the valve element relative to the valve seat, the drive assembly comprising a biasing member acting on a contact element for forcing the valve element against the valve seat in an idle state, the contact element being arranged for contact with the valve element, an actuation lever engaging the contact element, and a piezo actuator engaging the actuation lever for pivoting the actuation lever such that the contact element is moved and the valve element is free to disengage the valve seat.
  • Jetting dispensers of the aforementioned type are for example used in different types of dispensing applications in electronic industry applications in which minute amounts of a fluid material is applied onto a substrate.
  • a “jetting dispenser” is a device which ejects or “jets” a droplet of material from the dispenser to land on a substrate, wherein the droplet disengages from the outlet which is formed in a nozzle, before making contact with the substrate.
  • the droplet dispensed is "in flight" between the dispenser and the substrate, and not in contact with either the dispenser or the substrate, for at least a part of the distance between the dispenser and the substrate.
  • a jetting dispenser that dispense underfill materials, encapsulation materials, surface mount adhesives, solder pastes, conductive adhesives, and solder mask materials, fluxes, and thermal compounds.
  • a jetting dispenser includes a valve element, in particular needle or tappet, with a tip configured to selectively engage the valve seat.
  • the needle of the jetting dispenser is moved relative to the valve seat by a driving mechanism.
  • Contact between the tip of the needle and the valve seat seals off a discharge passage from a fluid chamber supplied with fluid material under pressure.
  • valve element is retracted from contact with the valve seat to allow a finite amount of the fluid material to flow through the newly formed gap and into the discharge passage.
  • the tip of the needle is then moved rapidly toward the valve seat to close the gap which generates a pressure that accelerates the finite amount of fluid material through the discharge passage and causes a droplet of the material to be ejected, or jetted, from an outlet of the discharge passage.
  • Jetting devices are configured for controlled movement above the substrate and the fluid material is jetted to land on an intended application area of a substrate. By rapidly jetting the material "on the fly” (i.e. while the jetting device is in motion), the dispensed droplets may be joined to form a continuous line. Jetting devices may therefore be easily programmed to dispense a desired pattern of fluid material. This versatility has made jetting devices suitable for a wide variety of applications in the electronics industry. For example, underfill material can be applied using a jetting device to dispense a fluid material proximate to one or more edges of the chip, with the material then flowing under the chip by capillary action.
  • the rapid movement toward the valve seat in jetting dispensers as of the aforementioned type is carried out by means of the biasing member acting on a contact element for forcing the valve element against the valve seat.
  • This biasing member acts on the contact element all the time and thus forces the valve element to the valve seat in an idle state.
  • These types of valves are also called “normally closed valves".
  • the actuation lever is used to raise the contact element, thus giving free the valve element to move out of engagement with the valve seat.
  • the disengaging movement of the valve element may be carried out due to an attachment to the contact element, or by means of an additional biasing member, such as a spring.
  • the spring raises the valve element away from the valve seat, such that the finite amount of fluid may pass into the discharge channel.
  • the actuation lever according to the jetting dispenser of the aforementioned type is actuated by a piezo actuator comprising a piezo crystal which, under influence of electric energy, acts on the actuation lever so as to rotate the actuation lever
  • a known jetting dispenser of such a type in general is disclosed in US 2013/0048759 .
  • WO 2014/048643 discloses a jetting dispenser with a direct contact of the piezo crystal and the valve element.
  • the piezo crystal also is used to raise and lower the valve element.
  • a further device which has a direct contact between the piezo actuator and valve element without actuation lever is disclosed in WO 2014/140195 .
  • a problem associated with dispensers with a direct contact between the piezo actuator and the valve element is that the piezo actuator does not provide a large displacement, and therefore an actuation lever normally is necessary to translate the small movement of the piezo crystal into a large movement for the valve element.
  • a larger movement is required to provide a larger gap through which liquid to be dispensed may flow.
  • An actuation lever may also reduce the overall size of the jetting dispenser which is beneficial in view of electronic applications.
  • a jetting dispenser with such an arrangement is for example disclosed in EP 1 652 588 A1 , EP 2 736 657 A1 or EP 2 143 503 A1 .
  • a problem associated with jetting dispensers in general is that the valve element accurately needs to seal the outlet and therefore needs to be seated within the valve seat in a predetermined force range.
  • the force is too low, the cut-off of the droplet tends to be not accurate and therefore an unclear application pattern is the result.
  • a too low force may also lead to an insufficiency of the valve.
  • the force is too high, there might be problems when disengaging the valve element from the valve seat, leading to droplets which are too small or form satellites, splashes or an irregular application pattern. Such effects are even worse when a too high force causes bouncing of the valve element in the valve seat.
  • a high force also tends to increase the wear on the contacting parts.
  • a solution for this problem is to use high precision replacement parts to ensure that the valve element seals the nozzle. In these parts, there is no possibility to compensate wear and the parts when experiencing wear need to be replaced. This results in high maintenance costs.
  • a sensor is used for the adjustment of the valve element in respect to the valve seat.
  • the valve seat in this solution is provided in a nozzle member which is screwable against a jetting dispenser body, carrying the valve element.
  • a sensor measures the contact between the valve seat and the valve element and indicates, with a signal, when the force is accurate.
  • the signal normally is a lamp, switching from red to green light to indicate to a customer that the position of the nozzle is correct and shall not be screwed further.
  • the invention solves this problem with a jetting dispenser of the aforementioned type, comprising an adjustment device for adjusting the position of the contact element such that a force acting on the valve element in the idle state is adjusted.
  • the invention is based on the idea that it is not only possible to set a contact force between the valve element and the valve seat by means of a screwable nozzle element, but also the position of the valve element could be adjusted. This is carried out according to the present invention by means of the contact element which is movable in the present invention. By providing the contact element in a movable manner with respect to the actuation lever, the force which acts on the valve element in the idle state can be adjusted. It is not necessary to adjust the nozzle member, the piezo actuator or the biasing member which acts on the contact element.
  • the jetting dispenser is greatly simplified. It is not necessary to use high precision parts, since due to the movable contact element which is adjustable by the adjustment device, the position of the valve element and the force acting on the valve element in the idle state can be set after assembly of the jetting dispenser. Moreover, when wear occurs, the contact element can be further adjusted to achieve again the desired contact force between the valve element and the valve seat. It is not necessary to replace the nozzle body, the valve element or other parts for a certain time, since the jetting dispenser can be again adjusted to meet the requirements.
  • the adjustment device is adapted to adjust the position of the contact element relative to the actuation lever. Moreover, it is preferred that the adjustment device is adapted to adjust a distance between the contact element and the actuation lever in the idle state, the distance being measured along the central axis of the valve element.
  • the valve element In the idle state, the valve element is seated in the valve seat and the contact element contacts the valve element to transmit the biasing force of the biasing member to the valve element.
  • the actuation lever is free to move in a predetermined range which is also dependent on the movement of the piezo actuator. Therefore, by means of varying the distance between the contact element and the actuation lever in the idle state, the force applied to the valve element can be varied. The distance is measured along the central axis of the valve element, starting from a contact surface of the contact element which contacts the valve element, and a surface of the actuation lever.
  • the contact element comprises a threaded portion and is received in a corresponding threaded through-hole in the actuation lever.
  • Providing the contact element in such a threaded through-hole with a threaded portion provides a simple measure for adjusting the distance of the contact surface of the contact element to the actuation lever.
  • the threads are preferably formed as fine-pitch threads such that a self-locking effect can be achieved.
  • the contact element comprises a contact surface for contacting the valve element and a screw head, the screw head being engageable by said adjustment device.
  • the screw head is preferably arranged opposite the contact surface.
  • the contact element preferably has a substantially pin-shaped form, extending along a longitudinal axis which forms the rotational axis of the threaded portion. While the contact surface projects out of the actuation lever from a first side of the actuation lever, the screw head extends from a second, opposite side of the actuation lever.
  • the screw head being engageable by said adjustment device.
  • the adjustment device in this instance may comprise a hand driven tool for engaging the screw head, for rotating the contact element, such that the position of the contact element is adjusted.
  • the adjustment mechanism comprises a rotatable shaft engaging the screw head, while allowing movement of the contact element in conjunction with said actuation lever.
  • the actuation lever moves, it is raised away from the valve element and thus into the direction of the screw head.
  • the contact element is moved into the direction of the tool or shaft.
  • the contact element is slightly rotated, since the actuation lever itself rotates about a rotational point when actuated by the piezo actuator.
  • the rotatable shaft engages the screw head while still allowing movement of the contact element on this rotational movement.
  • the shaft may have an engagement section which provides space for movement, such as a long recess or the like.
  • the rotatable shaft comprises a gimbal joint.
  • a gimbal joint allows torque transmission via an angled connection and thus allows bending of the shaft. Since the contact element is not only moved along a vertical axis, but also rotated, it is preferred that the shaft comprises such a gimbal joint.
  • a gimbal joint also is known under the name of a Cardan joint.
  • the contact element is in the form of a wedge positioned between the actuation lever and the valve element.
  • the adjustment device preferably is adapted to adjust the lateral position of the wedge. When the wedge is laterally moved between the valve element and the actuation lever, the distance of the valve element (in the idle state) and the actuation lever is adjusted.
  • a screw or the like can be provided for moving the wedge.
  • an eccentric element is provided which acts together with the wedge for repositioning the wedge and adjusting its position.
  • the adjustment device comprises a force limiting mechanism, limiting the force acting on the valve element.
  • the force limiting mechanism preferably limits the force to a predetermined threshold force which is in the range that the valve element is securely seated in the valve seat. As described in the introductory portion, it is important that the force is not too low and not too high. A force which is too low causes insufficient cut-off of the fluid and therefore insufficient drops which tend to produce so-called satellites. A force which is too high causes a relatively high wear at the parts which again results in a poor application pattern. When adjusting the contact element for increasing the force, it might happen that the force is set to a value which is too high.
  • the force limiting mechanism limits the force so that the service personnel is prevented from adjusting the contact element in a manner that a too high force is the result.
  • the force limiting mechanism comprises a tightening torque limiting device.
  • This embodiment in particular is preferred when the contact element is provided with the threaded portion and has to be rotated to be repositioned.
  • the torque acting on the contact element for rotating the contact element is an indicator for the force acting on the valve element.
  • the force limiting mechanism comprises a clutch, the clutch being adapted to open at a predetermined torque limit.
  • the clutch can be formed as a friction clutch which opens when a predetermined friction is exceeded.
  • the clutch may also be formed with a spring loaded part which opens when the spring force is exceeded.
  • the clutch comprises a disc with a plurality of recesses and a corresponding spring biased protrusion element, wherein upon circumferential movement of said protrusion element, which acts as a drive pin, said disc is driven, and wherein a force of a spring biasing the spring biased protrusion element against the disc is set such that, when a predetermined torque acting on the disc is reached, the protrusion element is pushed out of the corresponding recess against the force of the spring rather than driving the disc.
  • the disc preferably is provided at the driven side of the clutch and the spring biased pin on the drive side. The other way round however is also preferred.
  • the recesses may be formed as semi-sphericals and the protrusion element as a ball.
  • the spring biased protrusion element preferably is carried by a rotatable handle which is accessible from outside the jetting dispenser.
  • the clutch is a magnetic clutch, wherein upon exceeding a magnetic force the clutch opens.
  • a disc may be provided with a first plurality of magnets and a second disc may be provided with a second plurality of magnets, both discs do not contact each other, however the first disc is able to drive the second disc due to the magnetic forces.
  • This embodiment also has the benefit that wear of the parts is prevented, since the parts of the clutch do not contact each other.
  • the adjustment device comprises electromagnetic elements for adjusting the position of the contact element.
  • the electromagnetic elements may form a clutch which is electromagnetically driven, such that the force limit can be adjusted.
  • the electromagnetic elements may also be used for actively rotating the contact element, for adjusting its position.
  • Each electric motor also has a maximum torque which is the limit of the tightening torque it can deliver.
  • an electric motor comprises a torque limit which can be matched with the predetermined torque and force limit for the contact element.
  • three electromagnet elements are arranged offset to each other by approximately 120°.
  • the electromagnetic elements preferably are arranged such that they form a stator of an electric motor. In this instance, preferably an electric rotor is provided, which is connected to the contact element.
  • the electromagnetic elements preferably are controlled such that the electric rotor is rotated for adjusting the position of the contact element.
  • the electric rotor preferably comprises a magnet which is attached to the contact element.
  • the magnet preferably is a permanent magnet. This allows holding the rotational position of the magnet even when the electromagnetic elements are powerless. The magnet thus is hold by the cogging torque of the electromagnetic elements or a yoke which is part of the respective electromagnetic element.
  • a jetting dispenser 1 comprises a dispenser body 2 and a nozzle member 4.
  • the nozzle member 4 forms the fluid chamber 6 which has an inlet 8 and an outlet 9. Between the inlet 8 and the outlet 9 a valve seat 10 is provided. Between the valve seat 10 and the outlet 9 a discharge channel 12 is formed.
  • the inlet 8 is provided with a barb connector 14 and can be connected with a pressurized fluid cartridge.
  • the nozzle member 4 is connected to the dispenser body 2 via a fixing portion 16. It is removably fixed against the dispenser body 2.
  • valve element 18 is arranged which has a tip 20 for engaging the valve seat 10.
  • the valve element 18 runs into the dispenser body 2 and comprises a head 22.
  • the valve element 18 is guided within a bushing 24 which carries a sealing ring 26 at its lower end.
  • the jetting dispenser 1 moreover comprises a piezoelectric drive assembly 30 configured to reciprocally move at least a portion of the valve element 18 relative to the valve seat 10.
  • the piezoelectric drive assembly 30 comprises a piezo actuator 32 which is formed as a piezo stack.
  • the piezo actuator 32 is supported at a first support 33 against the dispenser body 2 and engages at the opposite end an actuation lever 34.
  • the actuation lever 34 is pivotably seated on a support 36 and comprises a protrusion 38 engaging the piezo actuator 32.
  • actuation lever 34 comprises an engagement portion 40 for engagement with the valve element 18.
  • a biasing member 42 in the form of a coiled spring 44 is provided in the dispenser body 2.
  • a coiled spring 44 rests on the engagement section 40 of the actuation lever 34, and on its other end is supported by a plate 46.
  • Plate 46 is supported in turn by a shaft 48 comprising a screw threaded portion 50 running through a respective threaded through-hole 52 of the dispenser body 2.
  • Shaft 48 is outside the dispenser body 2 provided with a knob 54 for rotating the shaft 48 such that the vertical position of plate 46 is adjustable. This provides in this embodiment ( Fig. 1 ) means for adjusting the force of the spring 44.
  • the jetting dispenser 1 For adjusting the force acting on the valve seat 10, the jetting dispenser 1 according to the present invention comprises a contact element 60 which is positioned between the engagement portion 40 of the actuation lever 34 and the head 22 of the valve element 18. The position of the contact element 60 is adjustable by means of an adjustment device 62.
  • the contact element is in the form of a wedge and comprises an inclined surface 64 which in inclined with respect to axis A which is the longitudinal axis of the valve element 18 and also the movement axis of valve element 18.
  • the inclined surface 64 is moved relative to axis A and thus relative to the valve element 18, such that a distance between the head 22 of valve element 18 and the actuation lever 34 can be adjusted.
  • the adjustment device comprises a spring 66 forcing the wedge-shaped contact element 60 into engagement with the head 22.
  • the spring 60 has a predetermined spring force and in turn excerpts a predetermined force onto the contact element 60.
  • the spring 60 consequently acts in a force limiting manner, limiting the contact force of the tip 20 and the valve seat 10.
  • a screw 72 is provided for fixing the relative position of the contact element 60 with respect to the actuation lever 34.
  • Screw 72 is screwed into a respective screw threaded portion of the contact element 60 and runs through an elongated hole in the actuation lever 34 and thus can fix the contact element 60 to the actuation lever 34.
  • Screw 72 is accessible via an opening 74 in the dispenser body 2. By means of inserting a respective tool through the opening 74 the screw 72 can be screwed or unscrewed.
  • the position of the contact element 60 in this embodiment first of all the screw 72 has to be loosened and afterwards the position of the contact element 60 can be adjusted by means of the force of the spring 66. When the desired position and thus the desired distance between head 22 and actuation lever 34 has been set, screw 72 can be fastened again.
  • the adjustment device further comprises an eccentric element 68 limiting the movement of the contact element 60.
  • Eccentric element 68 comprises a recess 70 into which a screw driver can be seated. Recess 70 or slot is accessible from outside the jetting dispenser 1 by a service personnel.
  • the contact element 60 may be moved to the right direction with respect to Fig. 1 . This movement is used when the nozzle member 4 has to be changed for maintenance reasons.
  • the nozzle member 4 is demounted it is beneficial to limit the movement of the contact element, since otherwise the spring 66 would push the contact element 60 too far to the left in Fig. 1 . This may lead to a too high contact force when a replacement nozzle member 4 would be mounted in this state. Therefore, when replacing the nozzle member 4, the service person would use the eccentric element 68 during replacement and after mounting has been completed, release the eccentric element 68 again so that the spring 66 is able to act on the contact element 60 as described above.
  • the piezo actuator 32 When now the piezo actuator 32 is powered, it will extend its volume and thus push against support 38, in turn rotating the actuation lever 34 and lifting the engagement section 40 together with the contact element 60.
  • the piezo actuator 32 When the piezo actuator 32 is depowered again, the volume is reduced and the biasing spring 44 can push down the valve element 18 again into engagement with the valve seat 10. The pressure in discharge channel 12 is increased and a droplet will be jetted out of the outlet 9.
  • FIG. 2 to 4 differ from the first embodiment ( Fig. 1 ) in particular therein, that the contact element 80 in the embodiments of Figs. 2 to 4 is substantially pin-shaped and not wedge-shaped, as it is in the embodiment shown in Fig. 1 .
  • the further elements are depicted with the reference signs used in Fig. 1 and in so far reference is made to the above description of Fig. 1 . In the following, in particular the difference between the first and the further embodiments will be described.
  • the contact element 80 comprises a contact surface 82 in contact with the head 22 of valve element 18. Moreover, the contact element 80 comprises a threaded portion 84 seating in a respective threaded through-hole 86 formed in the engagement portion 40 of the actuation lever 34. In this embodiment, biasing spring 44 is again seated against a plate 46 which however is not adjustable in position.
  • the distance between contact surface 82 and actuation lever 34 can be adjusted by respectively rotating the contact element 80.
  • the respective threaded connection between the threaded shaft 84 and the through-hole 86 causes a movement of the contact surface 82 either into the direction of head 22 or away from it, dependent on the rotational direction.
  • the distance of the contact surface 82 to the actuation lever 34 can be adjusted.
  • the contact element 80 For rotating the contact element 80, the contact element 80 comprises a screw head 88.
  • the screw head 88 comprises two opposing pins which are received in a hollow shaft 90 which has a slot extending in the axial direction.
  • the shaft 90 comprises a hollow interior 92 such that the screw head 88 can be received within the shaft 92.
  • the slot (which cannot be seen in Fig. 2 due to the cut view) provides a formfitting engagement with the respective pins 94 of the screw head 88, such that a formfitting engagement into the circumferential direction is achieved.
  • the shaft 90 is connected via a gimbal joint 96 to tool 98.
  • the gimbal joint 96 is necessary, since when the actuation lever 34 pivots about its pivot point P, on the one hand the contact element 80 will be lifted upwards, but also rotated together with the actuation lever 34 about the pivot point P.
  • Tool 98 is arranged received within an opening 100 of the dispenser body 2 and comprises a top recess 102 engaged by a respective tool. Moreover, tool 98 comprises a circumferential groove 104 in which a respective pin 106 which is fixed by a nut 108 protrudes. The pin 106 causes the tool 98 to stay at the same axial position with respect to axis A.
  • the torque is transmitted via gimbal joint 96 to shaft 90 and via the pins 94 to the contact element 80.
  • the contact element in turn is rotated, thus causing the distance between the contact surface 82 and actuation lever 34 to increase.
  • the valve element 18 contacts the valve seat 10, and by rotating the contact element 84 the force acting from the valve element 18 to the valve seat 10 can be adjusted.
  • tool 98 is rotated under usage of a torque wrench by a service personnel. Using a torque wrench to engage the recess 102, such that the torque supplied to the contact element 80 is limited.
  • FIG. 3 and 4 include in addition to the elements shown in Fig. 2 integrated force limiting means. Again, identical elements from Figs. 1 and 2 are depicted with the same reference signs in Figs. 3 and 4 , and in so far reference is made to the above description to Figs. 1 and 2 .
  • the embodiment is substantially identical to the embodiment of Fig. 2 , however includes a force limiting mechanism 110.
  • the force limiting mechanism 110 comprises a clutch 112 between a drive side and a driven side which will be described now.
  • Shaft 90 is connected via gimbal 96 to a further shaft 114 of the driven side of the clutch.
  • Shaft 114 is connected to a disc 116.
  • Disc 116 is supported by an axial and radial acting bearing 118.
  • the shaft 114 is provided with freewheeling device 120 which also provides a radial bearing for the shaft 114.
  • the drive side comprises a handle 122 which carries eccentrically a protrusion element 124 in the form of a ball.
  • the ball is seated within a recess 126 and biased by means of a spring 128.
  • the disc 116 comprises a plurality of recesses 130 which are provided in a ring shape on the disc 116.
  • the freewheeling device 120 is provided between the shaft 114 and a bushing 121 fixed to the handle 122.
  • the freewheeling device 120 allows rotation of the handle 122 relative to the shaft 114 in the tightening direction.
  • the freewheeling device however is adapted to block the relative movement when the handle is rotated into the loosening direction.
  • the freewheeling device 120 thus acts as a so called clamping roller freewheeling hub. In the loosening direction the rotational movement therefore is rather transferred via the blocked freewheeling device 120 than via the clutch.
  • an adhesive liquid drains into the region of the contact element 80 it may adhere the contact element 80 to the through hole 86. In this case it is possible to break this adhesion due to the blocking of the freewheeling device 120.
  • the force limiting mechanism 110 is based on electromagnetic effects.
  • the force limiting mechanism 110 comprises first, second and third coils 132a, 132b, 132c which are stacked upon each other and rotated against each other by 120 degree.
  • the coils 132a, 132b, 132c are provided with corresponding yokes 133a, 133b, 133c.
  • the yokes 133a, 133b, 133c are substantially U-shaped and run through the respective coil 132a, 132b, 132c.
  • Each yoke 133a, 133b, 133c comprises two legs.
  • Yoke 132a comprises legs 142a, 142b
  • yoke 132b comprises legs 144a, 144b
  • yoke 132c comprises legs 146a, 146b.
  • the legs 142a, 142b, 144a, 144b, 146a, 146b are each pairwise parallel to each other.
  • the coils 132a, 132b, 132c are connected via wires 134 to the control 140.
  • the control is adapted to energize the coils 132a, 132b, 132c in such a manner that a rotating electromagnetic field is generated between the legs 142a, 142b, 144a, 144b, 146a, 146b of the yokes 133a, 133b, 133c such that the magnet 94 is caused in rotation and in turn the contact element 80 is screwed into or out of the screw threaded bore 86.
  • the distance between the contact element 80 and the head 22 can be adjusted.
  • the maximum torque is adjustable.
  • the coils it is possible to electrically rotate the contact element 80 and therefore, according to this embodiment ( Fig. 4 , 5 ), adjustment of the position of the contact element 80 can be carried out automatically with a respective control tool.
  • the control 140 can be provided with a respective switch for setting the force and hence the maximum torque.
  • the control 140 can also be connected to other dispensers as well.
  • the control 140 may be programmes such that after each start of the dispenser, the coils 132a, 132b, 132c are energized so that the desired closing force of the valve is set.

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Claims (15)

  1. Distributeur (1) à jet, comprenant :
    une chambre (6) à fluide, une entrée (8) pour faire entrer du fluide dans la chambre (6) à fluide, une sortie (9) pour faire sortir du fluide de la chambre (6) à fluide et un siège (10) de robinet, placé entre l'entrée (8) et la sortie (9) ;
    un obturateur (18) ;
    un ensemble (30) d'entraînement piézoélectrique, configuré pour déplacer en aller et retour au moins une partie de l'obturateur (18) par rapport au siège (10) du robinet ;
    l'ensemble (30) d'entraînement comprenant :
    un élément (42) de poussée, agissant sur un élément de contact, pour obliger l'obturateur (18) à venir sur le siège du robinet dans un état de repos, l'élément de contact étant disposé pour venir en contact avec l'obturateur (18),
    un levier (34) d'actionnement, coopérant avec l'élément (60, 80) de contact,
    un actionneur (32) piézoélectrique, coopérant avec le levier (34) d'actionnement, pour faire pivoter le levier (34) d'actionnement, de manière à ce que l'élément de contact soit déplacé et de manière à ce que l'obturateur (18) soit libre de se séparer du siège (10) du robinet et
    un dispositif de réglage, pour régler la position de l'élément (60, 80) de contact, de manière à ce qu'une force, s'appliquant à l'obturateur (18) à l'état de repos, soit réglable.
  2. Distributeur à jet suivant la revendication 1, dans lequel le dispositif de réglage est conçu pour régler la position de l'élément (60, 80) de contact par rapport au levier (34) d'actionnement.
  3. Distributeur à jet suivant l'une quelconque des revendications précédentes, dans lequel le dispositif de réglage est conçu pour régler une distance entre l'élément (60, 80) de contact et le levier (34) d'actionnement à l'état de repos, la distance étant mesurée suivant l'axe (A) central de l'obturateur (18).
  4. Distributeur à jet suivant l'une quelconque des revendications précédentes, dans lequel l'élément (60, 80) de contact comprend une partie (84) filetée et est reçu dans un taraudage (86) correspondant du levier (34) d'actionnement.
  5. Distributeur à jet suivant la revendication 4, dans lequel l'élément (80) de contact comprend une surface (82) de contact, pour venir en contact avec l'obturateur (18), et une tête (88) de vis, la tête (88) de vis pouvant coopérer avec le dispositif de réglage.
  6. Distributeur à jet suivant la revendication 5, dans lequel le dispositif de réglage comprend un arbre (114) tournant, coopérant avec la tête (88) de la vis, tout en permettant un déplacement de l'élément (80) de contact en liaison avec le levier (34) d'actionnement.
  7. Distributeur à jet suivant la revendication 6, dans lequel l'arbre tournant comprend un joint (96) à la cardan.
  8. Distributeur à jet suivant l'une quelconque des revendications précédentes 1 à 3, dans lequel l'élément (60) de contact est sous la forme d'un coin, placé entre le levier (34) d'actionnement et l'obturateur (18).
  9. Distributeur à jet suivant la revendication 8, dans lequel la position latérale du coin est réglable au moyen du dispositif de réglage.
  10. Distributeur à jet suivant l'une quelconque des revendications précédentes, dans lequel le dispositif de réglage comprend un mécanisme (110) de limitation de force, limitant la force s'appliquant à l'obturateur (18).
  11. Distributeur à jet suivant la revendication 10, dans lequel le mécanisme (110) de limitation de force comprend un dispositif de serrage de limitation du couple.
  12. Distributeur à jet suivant la revendication 10 ou 11, dans lequel le mécanisme de limitation de force comprend un embrayage (112), l'embrayage (112) étant conçu pour s'ouvrir à une limite de couple déterminée à l'avance.
  13. Distributeur à jet suivant la revendication 12, dans lequel l'embrayage (112) comprend un disque (116), ayant une pluralité de cavités (130) et un élément (124) en saillie correspondant, soumis à l'action d'un ressort, dans lequel, après qu'un mouvement circonférentiel de l'élément (124) en saillie a agit comme broche d'entraînement et que le disque (116) est entraîné, une force d'un ressort (128), repoussant l'élément (124) en saillie soumis à l'action d'un ressort, sur le disque (116), étant réglée de manière à ce que, lorsqu'un couple déterminé à l'avance s'appliquant au disque (116) est atteint, l'élément (124) en saillie soit sorti de la cavité (130) correspondant, à l'encontre de la force du ressort (128), plutôt que d'entraîner le disque (116).
  14. Distributeur à jet suivant la revendication 12, dans lequel l'embrayage (112) est un embrayage magnétique, dans lequel, si une force magnétique est dépassée, l'embrayage (112) s'ouvre.
  15. Distributeur à jet suivant l'une quelconque des revendications précédentes, dans lequel le dispositif de réglage comprend des éléments (132a, 132b, 132c) électromagnétiques pour régler la position de l'élément (60, 80) de contact.
EP16205111.4A 2016-12-19 2016-12-19 Distributeur piézoélectrique à jet Active EP3335805B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP16205111.4A EP3335805B1 (fr) 2016-12-19 2016-12-19 Distributeur piézoélectrique à jet
PCT/US2017/066692 WO2018118686A1 (fr) 2016-12-19 2017-12-15 Distributeur à jet piézoélectrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16205111.4A EP3335805B1 (fr) 2016-12-19 2016-12-19 Distributeur piézoélectrique à jet

Publications (2)

Publication Number Publication Date
EP3335805A1 EP3335805A1 (fr) 2018-06-20
EP3335805B1 true EP3335805B1 (fr) 2019-04-03

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EP16205111.4A Active EP3335805B1 (fr) 2016-12-19 2016-12-19 Distributeur piézoélectrique à jet

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EP (1) EP3335805B1 (fr)
WO (1) WO2018118686A1 (fr)

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CN109604107B (zh) * 2018-10-15 2020-10-16 北京派和科技股份有限公司 对称性结构布局的压电喷射阀

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CN110985746B (zh) * 2019-11-28 2022-04-29 东莞理工学院 一种刚度差压电高频气阀
CN111068951A (zh) * 2020-01-06 2020-04-28 常州铭赛机器人科技股份有限公司 流体微量喷射装置
CN111282775B (zh) * 2020-05-12 2020-08-04 江苏高凯精密流体技术股份有限公司 一种压电喷射阀的流量控制装置及其控制方法
TWI742998B (zh) * 2021-02-09 2021-10-11 萬潤科技股份有限公司 液材擠出裝置及其操作方法
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CN113856997B (zh) * 2021-11-09 2022-10-14 上海盛普流体设备股份有限公司 具有两级放大机构的双边致动喷射点胶阀及其喷胶方法
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CN111515082A (zh) * 2020-04-30 2020-08-11 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） 一种超声振动搅拌式压电喷射阀

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