EP1232812A2 - Rivet setting apparatus with means to control the removal of broken-off mandrels - Google Patents

Abstract

The blind riveting gun has a pneumatic drive to feed the rivet shafts through a sensor (3) to detect if it has a pre fitted rivet head (9) or not. The sensor can be mounted on the nozzle head (12) of the riveter. The sensor can control air pressure feed to the riveter depending on the state of the rivet.

Description

The invention relates to a rivet setting tool with a pneumatic device for removing torn off Head pin.

From the German utility model DE 298 22 652 is a Rivet setting tool with a device for removal torn rivet pins known, in which by a Actuator on the handle of the rivet setting tool Airflow to remove the torn rivet pins can be interrupted or turned off. Although this Rivet setting tool excellent properties in terms of Saving pneumatic fluid has and is already through saved energy costs themselves after a short time amortized, there is a constant effort, such Rivet setting tools, in particular with regard to their consumption to further improve compressed air or energy.

It was found that, surprisingly, the Consumption of pneumatic fluid can be reduced even further can if the pneumatic device for removal ripped rivet pins by a sensor device is controllable, which is the existence or the No rivet pin detected. In extremely The sensor device can advantageously The presence or absence of a rivet pin in the mouthpiece of the rivet setting tool and thereby only then the supply of pneumatic fluid, in particular Press compressed air to the suction device when the rivet pin a rivet is inserted into the tool. This will the rivet pin in the vacuum created Rivet setting tool held as soon as this from the front in the Mouthpiece was introduced and will also be the demolished one The rivet pin is transported away safely after the rivet setting process.

With another sensor for recording the removal torn rivet pins, which is particularly preferred embodiment in the area of the end of the Rivet setting tool and the passage of the Rivet pin, towards a collecting container or to one Line to a central collection container can be the The user is shown the correct removal and they are informed about correct functioning.

This can be identified, for example, by the Turn off the feed or a pulsating feed from Pneumatic fluid take place, which is then usually acoustic is perceived by the user. Furthermore, a optical control display, for example in the form of LEDs or an LCD display on the device signal and if necessary to the Forward rivet setting tool to connected computer, which creates an error log for the corresponding device can be performed.

A preferred sensor comprises a pneumatic sensor, especially in the form of a sensor that a pneumatic Check valve is assigned.

A particularly wear-free sensor takes the form of a Optical sensor use, especially in the form of a Light barrier or reflex measuring device, which either interrupted by the inserted rivet pin or one Triggers back reflex to the optical photo receiver.

A particularly inexpensive design includes one electrical button or switch to trigger a electrically operated valve. Here, if necessary there is no need for an electrical control device, if the electrical button or switch is electrical Actuates directly actuated valve.

In a particularly advantageous manner, the optical sensor and the electric button or switch with an electric or electronic control device, which controls the electrically actuated valve. This can Delay or delay times can be set while which is the pneumatic fluid of the device for removal is still fed when the rivet pin is already through the Tear-off process no longer in operative connection with the sensor stands. Furthermore, electrical or electronic control device also the amount of for Compressed air provided can be controlled if that electrically operated valve next to a closed and fully open position also one or more Has positions with partial opening. This can for example a reduced amount of compressed air are supplied when the rivet is only in one position The mouthpiece is to be held and can be used immediately after the demolition process the compressed air is increased to the torn rivet pin to be transported safely.

In a further advantageous embodiment, the Sensor device for a hydraulic encoder include hydraulically controlled pneumatic valve.

With an inductive sensor, the electrical or electronic control device also permanent and can be controlled safely.

With lower power consumption, the Sensor device are usually operated when this is a capacitive instead of the inductive sensor Sensor includes.

Another simple embodiment can be a mechanical Include encoder, for example by means of a push rod or a flexible, pressure-transmitting wire or Bowden cable controls a pneumatic shut-off valve.

The electrical or electronic control device by means of accumulators fed by an induction loop and / or Capacitor plates and one with the induction loop and / or the charging circuit connected to the capacitor plates is loadable. In this embodiment, the charging circuit by means of electrical, magnetic, in particular electromagnetic alternating fields are fed, which for example in a storage area of the rivet setting tool Will be provided. This can be used for a alternative embodiment used leads for The supply of electrical energy is largely avoided and one that is hermetically sealed to the outside and very little failure-prone riveting tool are provided.

The external charging devices can then be dispensed with if, for example, a rotor comprising magnets is pneumatically driven, for example in a Supply of pneumatic fluid is arranged.

If the electrical or electronic control device a device with variable resistance for pneumatic fluid, particularly compressed air, can thereby be controlled for example the speed of the controlled Pneumatic piston and that of the in connection with this standing hydraulic pistons can be controlled. This can the setting speed of the rivet setting process is optimized and on the respective rivet pin can be adjusted.

Furthermore, if the variable resistance device Rotor comprising magnets and at least one coil contains, the resistance of the coil and / or in these fed currents can be controlled, the Riveting process on the increased flow rate and associated associated induced currents detected and subsequently regulated to optimal values.

Such a rotor is in the pneumatic fluid supply also very advantageous because of this Turbine-like start-up for smooth and jerk-free movements of the piston system. External pressure fluctuations will be also mitigated causing it to have a setting process more homogeneous force curve, this means with higher quality comes.

With an external setting device, the Train speed, especially the size of each Rivets are assigned.

Fig. 1

eine teilweise Querschnittsansicht eines pneumatisch-hydraulischen Nietsetzwerkzeugs zeigt,

Fig. 2

eine teilweise Querschnittsdarstellung eines oberen Teils der bevorzugten Ausführungsform eines pneumatisch-hydraulischen Nietsetzwerkzeugs mit optischem Sensor zeigt,

Fig. 3

eine weitere bevorzugte Ausführungsform eines pneumatisch-hydraulisch betriebenen Nietsetzwerkzeugs mit elektrischen Sensoren zeigt, und

Fig. 4

eine nochmals weitere Ausführungsform eines pneumatisch-hydraulisch betätigbaren Nietsetzwerkzeugs mit mechanischen Sensoren darstellt.

The invention is described below with reference to preferred embodiments and with reference to the accompanying drawings, in which

Fig. 1

shows a partial cross-sectional view of a pneumatic-hydraulic rivet setting tool,

Fig. 2

FIG. 2 shows a partial cross-sectional view of an upper part of the preferred embodiment of a pneumatic-hydraulic rivet setting tool with an optical sensor,

Fig. 3

shows a further preferred embodiment of a pneumatically-hydraulically operated rivet setting tool with electrical sensors, and

Fig. 4

represents yet another embodiment of a pneumatically-hydraulically actuated rivet setting tool with mechanical sensors.

Detailed description of the preferred embodiments

In the following description of the preferred Embodiments are first referred to Fig. 1, which is a partial cross-sectional view of a first preferred embodiment of a penumatic-hydraulic Rivet setting tool shows. All in all with the reference number 1 provided pneumatic-hydraulic rivet setting tool its main functions already described in the German patents and utility models DE 34 00 942, DE 196 09 351, G 295 04 316 and G 298 22 652, the content of which Reference also to the subject of the present description is made, and only becomes rough in terms of its function explained.

A pneumatic piston 2 is activated when a pusher 3 is actuated with pneumatic fluid, especially compressed air, in Moved in the direction of arrow X and presses it by means of with this rigidly connected hydraulic piston 4 Hydraulic fluid, especially hydraulic oil, from the bottom Hydraulic cylinder 5 in an upper hydraulic cylinder 6 in Head of the rivet setting tool 1, in which the hydraulic piston 7 is moved back in the direction of arrow Y. The Hydraulic piston 7 is connected to a chuck 8 in a tensile manner (see for example Figures 2 to 4), which the rear Part of a rivet 9, which is also referred to as a rivet pin will hold.

When withdrawing, the rivet pin of the rivet 9 is torn off and through a discharge channel 10, which is centrally through the Head of the rivet setting tool 1 extends, backwards, into one Rivet collecting container 11 in the direction of arrow Y transported. The supply of compressed air to the discharge duct 10 is the expert from the property rights cited above known and will not be described in more detail.

According to the invention is in the mouthpiece 12 of the rivet setting tool 1, a sensor 13 is arranged with which the presence or the absence of a rivet pin of a rivet 9 in Mouthpiece 12 is detectable.

Another sensor 14 is preferably near the arranged rear end of the discharge channel 10 and can Passage of a torn rivet pin 9 to capture.

The sensors 13, 14 are in a preferred one Embodiment optical sensors, which in the form of a Photoelectric sensor or reflex measuring device detect whether the Light beam is interrupted or the intensity of the back-reflected light changes.

3 shows, for example, an optical sensor 13 in the form a light barrier in which an optical sensor 15, Light through the discharge channel 10, the corresponding side Has openings towards an optical receiver 16 sends the by means of an electrical lead 17, such also the optical transmitter 15 with a electronic control device 18 is connected.

Becomes the optical sensor for detecting the back reflection used, both transmitter 15 and receiver 16 are found preferably above the discharge channel 10 and measures the Receiver 16 reflects the light back from the transmitter 15.

In an alternative embodiment, as shown in FIG. 3, The sensor 13 comprises an inductive sensor, which the Induction change in an induction coil 19, which the Discharge channel 10 surrounds concentrically, detected.

Instead of the induction coil 19 can on both sides of the Discharge channel 10 can also be arranged capacitor plates, by means of which by inserting the rivet pin caused capacitive change is detectable. hereby a capacitive sensor is provided, in which the Discharge channel 10 preferably to the capacitor plates 19 has openings.

The sensor 13 is preferably close to the feed 8 arranged, which in turn is preferably close located behind the screw sleeve 20 in this way also process rivets with short rivet pins correctly can.

The discharge duct 10 becomes compressed air from an annular space 21 Removed torn rivets supplied, this Annular space 21 is fed by a pneumatic feed line, in which a controllable valve 22 is located.

In the embodiment shown in FIG. 2, this includes Pneumatic valve 22 has a spherical closing body 23, the by the force of an electromagnet 24 from its sealing system on the valve body seat 25 movable down is. The valve seat 25 is located at the top of one narrowing cylindrical bore, which is after below, especially in the interior of the coil Electromagnet 24 extends. By releasing the Valve seat 25 can pressurized air into the annular space 21 and there by a side not shown in the figures Drilling the discharge channel from the annulus into the discharge channel reach. For this purpose, the electromagnet 24 with the electronic control device 18 conductively connected.

It is within the scope of the invention, the electromechanical Pneumatic valve 22 also with a different size or the expert known design at another location in the supply line to Annulus 21, preferably within the rivet setting tool 1, or remotely controlled outside of the rivet setting tool 1 to arrange.

The electronic control circuit 18 is powered by a battery, preferably fed by a rechargeable battery 26, which, like the electronic control device in the field the handle of the rivet setting tool 1 under a removable Cover 27 is arranged. As a result, the battery 26 or the electronic control circuit 18 replaced become.

To charge the rechargeable battery 26 can on lower end of the rivet setting tool 1 capacitor plates 27 be arranged, which with the electrical generated there Alternating field a charging circuit in the electronic Control device 18 AC voltage via feed lines 28 feed which rectifies and charge the battery 26 this is fed in a controlled manner as a DC voltage signal.

With an external electromagnetic or magnetic Alternating field can also be fed to coils 29, which alternatively or additionally, those induced in these AC of the electronic control circuit 18 for Charge the batteries 26.

If a magnetic or Magnets 30 comprising rotor 31 with fan blades arranged, when it rotates in the coils 29 Alternating current can be induced, which to charge the Batteries 26 can be used. This makes a pneumatic-electric Energy converter provided.

In a particularly preferred embodiment, this is Rotor 31 arranged in a chamber 32 through which the Pneumatic fluid or the compressed air through to one Feed line 33 flows, with which the rivet setting tool 1 is fed.

As soon as a rivet 9 is inserted into the mouthpiece 12, the sensor 13 detects this and signals the presence of the rivet pin of the electronic control device 18. Which then opens the pneumatic valve 22.

In a particularly preferred embodiment, the Position of the closing body 23 through the Electromagnet 24 influences the current sent that a complete closure, a full opening and partial opening of the pneumatic feed channel is effected.

In this embodiment, the rivet pin is inserted a partial opening of the pneumatic valve 22 through a predefined current through the magnet 24 such causes the rivet 9 used to be securely in place is held. Through this flow of compressed air Rotor 31 set in motion and induce the magnets 30 in the induction coils 29 electrical currents, which for Charging the rechargeable battery 26 is usable.

If the pusher 3 depressed and this moves a valve rod 34 to Compressed air is supplied to the pneumatic cylinder 2 an increased flow and an increased speed of the Rotor 31, which is induced by the increased frequency of the Currents can be detected by the electronic control device 18 is.

The sensor 13 signals that the torn rivet pin has broken off is no longer in place or by detecting the increased speed of the rotor 31, switches the electronic Control device 18 in the pneumatic valve 22 fully open position and this leads to an increased supply of pneumatic fluid, which leads to a Safe removal of the torn rivet pin in the direction Y and past the sensor. Furthermore, the electronic control device a delay circuit comprise, by means of which the increased supply of compressed air is maintained for a period of time which safe removal of the rivet pin is necessary.

These operating states can with the light emitting diodes 35, 36 Users are displayed. In a preferred one Embodiment, the LED 35 lights up green as soon as one Rivet 9 was inserted into the mouthpiece 12.

A light emitting diode 36 lights up red, if after the The riveted pin does not detach the sensor 14 happened. Furthermore, for signaling a incorrect removal is not one in the figures illustrated acoustic warning device, such as a buzzer operated by the electronic control circuit 18 become.

To carry out a correct setting process, the Speed of the flowing to the pneumatic piston 2 Pneumatic fluids set by the speed of the rotor 31 become.

With detection of the rotational frequency 31 based on the frequency of the induced induction currents is electronic Control device 18 is able to flow Measure or control air volume. The control of the inflow of air takes place through a Current applied to the induction coil 29, which thereby are braked and reduce the amount of air flowing through. Furthermore, the speed of the rotor 31 by changing the electrical resistance, which by the control circuit 18 is placed on the coils 29 can be influenced.

By a knurled wheel 37, which is attached to the handle 3, becomes a resistor, not shown in the figures changed, which is sensed by the control circuit 18 and controls a voltage-dependent oscillator in it. A comparison circuit in the control device 18 provides that the rotational frequency of the rotor 31 is not the frequency the voltage-controlled one set with the pusher 37 Oscillator exceeds, so that with the thumb wheel 37 Retraction speed of the hydraulic piston 7 and thus the rivet setting process is adjustable.

Different rivet setting speeds are at one particularly preferred embodiment latching positions of the knurled wheel 37 and assigned to certain rivet sizes. This allows a optimal rivet setting speed for different sizes and different fixed rivets can be set.

A particularly simple embodiment of the rivet setting tool 1 comprises a mushroom-shaped transmitter 38, which in part in the discharge channel 10 protrudes laterally.

This mechanical sensor 13 can be used as a hydraulic piston be formed, which is a hydraulic supply line to Pneumatic valve 22 controls. The valve cross section can be there by a hydraulic not shown in the figures controlled piston changed as described above become.

In an alternative embodiment, the mushroom-shaped encoder moves a Bowden cable that moves the valve body of the valve 22 or does the mushroom-shaped encoder control an electrical one Switch or button on, which as described above in operative connection with the electronic control circuit 18 stands to the rivet setting functions described above perform.

Claims (19)

Rivet setting device with a pneumatic device (10, 21, 22, 23, 24, 25) for removing torn rivet pins, through which torn rivet pins can be removed, which
characterized in that the pneumatic device (10, 21, 22, 23, 24, 25) for removing torn rivet pins can be controlled by a sensor device (3) which detects the presence or absence of a rivet pin of a rivet (9). Rivet setting device according to claim 1, characterized in that the sensor device (3) detects the presence or absence of a rivet pin in the mouthpiece (12) of the rivet setting device (1). Rivet setting device according to claim 1 or 2, characterized in that the sensor device (3) is operatively connected to a valve device (22), whereby pneumatic fluid, in particular air, can be supplied to the device (10, 21, 22, 23, 24, 25) for removal is when a rivet (9) is inserted into the rivet setting tool (1). Rivet setting device according to claim 1, 2 or 4, further characterized by a further sensor (14) for detecting the removal of the torn off rivet pin. Rivet setting device according to claim 1, 2, 3 or 4, characterized in that the sensor device (3) is a pneumatic sensor, in particular in the form of a sensor
a pneumatic shut-off valve (22). Rivet setting device according to claim 1, 2, 3 or 4, characterized in that the sensor device (3) comprises an optical sensor (15, 16), in particular in the form of a light barrier or reflex measuring device. Rivet setting device according to claim 1, 2, 3 or 4, characterized in that the sensor device (3) comprises an electrical button or switch (13, 38) for triggering an electrically actuable valve (22). Rivet setting device according to claim 1, 2, 3 or 4, characterized in that the sensor device (3) comprises a hydraulic transmitter (38) for a hydraulically controlled valve (22). Rivet setting device according to claim 1, 2, 3 or 4, characterized in that the sensor device (3) comprises an inductive sensor. Rivet setting device according to claim 1, 2, 3 or 4, characterized in that the sensor device (3) comprises a capacitive sensor (19). Rivet setting device according to claim 1, 2, 3 or 4, characterized in that the sensor device (3) comprises a mechanical transmitter (38) which controls a pneumatic shut-off valve (22). Rivet setting tool according to one of the preceding claims, in particular one of claims 4 to 11, characterized in that an electrically powered control device (18) actuates a signal transmitter (35, 36) when the rivet pin is not transported away correctly. Rivet setting device according to claim 12, characterized in that the control device (18) controls the pneumatic valve (22) in at least three positions, a first locked position, a second, preferably little pneumatic fluid permeable, partially open position and a third fully open position in order to to consume almost no pneumatic fluid in the first position, in the second position preferably to hold the rivet (9) used with a certain consumption of pneumatic fluid which is sufficient to hold the rivet (9) in essentially any position of the rivet setting tool (1), and in the third position to remove the torn rivet pin with more consumption of pneumatic fluid than in the second position. Rivet setting tool, in particular according to one of the preceding claims, characterized in that the electrical or electronic control device (18) is fed by means of accumulators (26) which are provided by an induction loop (29) and / or capacitor plates (27) and one with the induction loop (29 ) and / or the charging circuit connected to the capacitor plates (27) can be charged, the charging circuit being able to be fed by means of electrical, magnetic and in particular electromagnetic alternating fields. Rivet setting tool, in particular according to claim 14, further characterized by a pneumatic-electrical energy converter. Rivet setting device according to claim 14 or 15, characterized in that the alternating magnetic fields are generated by a pneumatically operated rotor (31) comprising magnets (30). Rivet setting device according to claim 14, 15 or 16, characterized in that the rotor (31) comprising magnets (30) can be driven by the pneumatic fluid supplied to the rivet setting device. Rivet setting tool, in particular according to one of the preceding claims, characterized in that the electrical or electronic control device (18) controls a device with variable resistance for pneumatic fluid, in particular compressed air. Rivet setting tool, in particular according to one of the preceding claims, characterized in that the device with variable resistance contains the rotor (31) comprising magnets (30) and at least one coil (29), the resistance of the coil and / or the currents fed into it , can preferably be controlled by the electrical control device (18).

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