EP3505301B1 - Verschraubungsverfahren einer mutter um ein rohr, das eine neuindexierung umfasst, und entsprechende vorrichtung - Google Patents

Verschraubungsverfahren einer mutter um ein rohr, das eine neuindexierung umfasst, und entsprechende vorrichtung Download PDF

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Publication number
EP3505301B1
EP3505301B1 EP18215453.4A EP18215453A EP3505301B1 EP 3505301 B1 EP3505301 B1 EP 3505301B1 EP 18215453 A EP18215453 A EP 18215453A EP 3505301 B1 EP3505301 B1 EP 3505301B1
Authority
EP
European Patent Office
Prior art keywords
motor
end member
screwing
nut
indexing
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.)
Active
Application number
EP18215453.4A
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English (en)
French (fr)
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EP3505301A1 (de
Inventor
Laurent METAIS
Vincent BOUSSARD
DELMAS Antoine
Xavier ISSE
GUZIOLOWSKI Robert
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.)
Georges Renault SAS
Original Assignee
Georges Renault SAS
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Publication date
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Publication of EP3505301A1 publication Critical patent/EP3505301A1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/004—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose of the ratchet type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose
    • B25B21/002—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose for special purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B13/00—Spanners; Wrenches
    • B25B13/48—Spanners; Wrenches for special purposes
    • B25B13/481—Spanners; Wrenches for special purposes for operating in areas having limited access

Definitions

  • the field of the invention is that of screwing techniques for tube connection nuts.
  • a nut is used to press a tube against an element to be supplied with fluid, such as for example a braking fluid supplying braking components, fuel supplying the combustion chambers of a heat engine, ...
  • fluid such as for example a braking fluid supplying braking components, fuel supplying the combustion chambers of a heat engine, ...
  • the nut is mounted movable in rotation around the tube (the latter passes through the nut) and is tightened on or in the element to be fed to press the tube against it and ensure the tightness of the connection.
  • the presence of the tube prevents the use of a conventional tool equipped with a rotary terminal member capable of cooperating with the nut to cause it to rotate, i.e. a screw socket, ordinarily cylindrical.
  • the presence of the tube therefore requires the use of a tool whose casing and the terminal member have a lateral opening allowing the passage of the tube when these openings coincide with each other, i.e. are aligned.
  • FIG. 1 illustrates a top view of the end of a screwing device allowing the tightening of an assembly of this type.
  • This screwdriving device conventionally comprises a V screwdriver (of which only the end is shown) at the end of which is assembled a screwing end for EV tube connection nuts.
  • the internal transmission of the EV screwdriver bit cooperates with the output shaft of the V screwdriver, the latter being driven in movement via the transmission and the internal motor of the V screwdriver.
  • the terminal member 10 of the screwing bit EV is pierced in its center by a hole 100 and has a lateral opening 101 opening into the hole 100.
  • the portion of the casing 11 housing the terminal member 10 also has a side opening 110.
  • the screwing device can take an open position in which the openings 101 and 110 coincide to allow insertion, or the extraction of a tube inside the hole 100 of the terminal member 10.
  • Such re-indexing is implemented at the end of each screwing operation so as to allow on the one hand the release of the screwdriver from the assembly at the end of screwing and on the other hand the engagement of the screwdriver on another assembly to carry out a new screwdriving operation.
  • FIG. 3 illustrates a top view of a portion of the transmission 12 placed between the engine and the terminal member 100.
  • This transmission portion 12 comprises in this example a first pinion 120 intended to be rotated alternately in the direction of screwing and in the direction of unscrewing by the motor of the screwdriver V.
  • This first pinion 120 meshes with a cascade of pinions 121 comprising a first intermediate pinion 1211 meshing with two second intermediate gears 1212 which in turn mesh with a second pinion 122 linked in rotation with the terminal member 10.
  • the presence of the two second intermediate gears 1212 makes it possible to guarantee continuity of meshing by one of these when the opening 101 devoid of teeth coincides with the other second intermediate pinion 1212.
  • the number of pinions integrated in the screwing bit EV depends on the length of the latter depending on the application for which it is doomed.
  • the transmission of the screwing bit EV can integrate a rear stop against which the transmission abuts in the direction of unscrewing when the openings 101, 110 coincide.
  • FIG. 4 illustrates the transmission portion 12 of the Figure 3 from which the first pinion 120 has been removed.
  • FIG 5 illustrates a bottom view of the first pinion 120 on which we observe that a stop 1201 protrudes from the lower face of the first pinion 120 over half of its circumference.
  • This stop 1201 has the shape of a half ring (half moon).
  • the casing 11 houses a pawl 13 mounted movable in rotation, against the effect of a leaf spring 14, around an axis substantially parallel to the axis of rotation of the first pinion 120 in the casing 11.
  • the stop 1201 of the first pinion 120 slides against the pawl 13 which is housed in a groove 15 provided for this purpose in the casing 11. This allows the first pinion 120 to rotate freely to rotate the terminal member 10 in the screwing direction via the cascade of pinions 121.
  • the first pinion 120 rotates freely until the pawl 13 comes out of its groove 15 and the stop 1201 of the first pinion 30 comes into engagement with the pawl 13 , the transmission then being blocked in the unscrewing direction.
  • the openings 101, 110 coincide: the device is in the open position. Furthermore, in this position, all the transmission clearances between the motor and the first pinion 120 are taken up in the direction of unscrewing.
  • the screwdriving device comprises means for measuring at least one piece of information representative of the torque delivered by the motor.
  • the motor is operated in the direction of unscrewing, and the stop 1201 comes to rest against the pawl 13, the first pinion 120 blocks in the direction of unscrewing, inducing an increase in the torque delivered by the motor.
  • the controller integrated into the device screwing or to which the screwdriving device is connected controls the stopping of the motor, the device being in the open position.
  • an operator inserts the tube into the hole 100 of the terminal member 10 by passing it through the side openings 110, 101, then makes the terminal member cooperate with the nut to allow it to be screwed.
  • the screwing device Before engaging the screwing device on the assembly to be screwed, the screwing device is in the open position to the extent that it has been reindexed in this position at the end of the previous screwing operation.
  • the tool may undergo an initial re-indexing before the start of the screwdriving operation to ensure that it is well in the open position if the end member had ever rotated since the end of the previous screwing so that it is no longer in its open position.
  • the operator then activates the trigger G of the device in such a way that the screwdriver controller controls the motor according to a pre-programmed screwdriving strategy.
  • the operator releases the nut from the terminal member by translating the screwing device along the axis of the tube, moving it away from the nut so that they do not are more in touch with each other.
  • the tube remains trapped in the hole 100, unless the screwing operation was stopped while the device was in the open position, which rarely occurs.
  • the operator then launches a re-indexing phase controlled by the controller so as to place the device in the open position and thus allow the operator to release the tube from the device.
  • the controller controls the rotation of the terminal member in the direction of unscrewing until the information representative of the torque delivered by the motor reaches the rear stop threshold value in which the transmission is blocked against the rear stop and the device is in the open position.
  • This solution of the prior art is effective in that it allows the device to be easily and reliably returned to the open position to allow it to be positioned on an assembly or to be released from it.
  • the controller assumes that the screwdriving device is not engaged with the nut.
  • the controller implements this re-indexing.
  • the re-indexing being done by rotating the terminal member in the direction of unscrewing, its implementation, while the screwing device is still engaged with the nut, can lead to partial unscrewing of the nut which causes a deterioration in the quality of tightening, or even a safety problem for certain critical applications (partial tightening of a brake hose for example).
  • the invention aims in particular to provide an effective solution to at least some of these different problems.
  • an objective of the invention is to provide a technique for re-indexing a device for screwing a nut around a tube which is improved.
  • the invention aims, according to at least one embodiment, to provide such a technique which is safe and reliable, that is to say which limits the risk of degrading the quality of screwing.
  • Another objective of the invention is, according to at least one embodiment, to provide such a technique which is simple and/or economical.
  • the invention proposes a method of screwing a tube connection nut to an element by means of a screwing device, said tube extending through said nut, said device comprising a casing, a terminal member rotary capable of cooperating with said nut, a motor and a transmission capable of driving said terminal member and having an operating clearance, said casing and said terminal member each having a lateral opening allowing, when they coincide, the passage of said tube into the terminal organ, and thus defining an open position of the terminal organ.
  • said method comprises, between the step of disengaging the end member of the nut and the step of removing the device from the tube, a re-indexing step during which said motor brings back the terminal member in said open position by causing it to rotate in the direction of screwing.
  • the invention makes it possible, in the event of non-disengagement of the terminal member during re-indexing, to eliminate the risk of the nut being loosened.
  • the invention thus makes it possible to eliminate the risk of degrading the quality of tightening during re-indexing.
  • the step of returning to the rear stop when carried out upstream of the tightening step, it provides a reliable indexing position at the stop which will allow, at the end of the tightening, a precise re-indexing step due to the fact that the means control of the screwdriver can calculate the re-indexing position from an angle corresponding to a reliable open position obtained when setting the stop, while avoiding rotation in the direction of unscrewing at the end of the likely tightening to induce loosening of the nut.
  • the control of the re-indexing only depends on the position .
  • the re-indexing step includes a phase of verifying that the operator has disengaged said terminal member from said nut.
  • the invention also relates to a device for screwing a tube connection nut to an element, said tube extending through said nut, said device comprising a casing, a rotary terminal member capable of cooperating with said nut, a motor and a transmission capable of driving the terminal member, said casing and said terminal member each having a lateral opening allowing, when they coincide, the passage of said tube, and thus defining an open position of the terminal member.
  • Such a device can be used to carry out successive screwing cycles and comprises control means capable of controlling the motor in rotation to tighten the nut.
  • said device comprises re-indexing means capable of returning said terminal member to the open position at the end of tightening, by rotation in the screwing direction.
  • the invention also relates to a computer program product, comprising program code instructions for implementing a method according to any of the variants described above, when said program is executed on a computer.
  • the invention also relates to a non-transitory, computer-readable storage medium storing a computer program product according to the invention.
  • FIG. 6 illustrates an example of a screwdriver according to the invention.
  • Such a screwdriver 1 conventionally comprises a casing 16 housing a motor 17 and a transmission 18 and at the end of which is placed an output shaft 19 capable of being rotated by the motor via the transmission.
  • the screwdriver also includes a screwing bit 20 identical to the screwing bit EV described in relation to the figures 1 to 5 . It is therefore not described in more detail again here.
  • the rear stop mechanism is optional so that the stop 1201, the pawl 13, the blade 14 and the groove 15 may not be used.
  • the output shaft 19 is linked in rotation with the first pinion 120.
  • the first pinion comprises in its center a female cavity 1202 inside which is housed the end of the output shaft 19 of complementary form.
  • the screwdriver is connected to a controller 21 by wire and/or wirelessly.
  • the controller can be integrated into the screwdriver.
  • the screwdriver also includes a transmission/reception module 214 to communicate with the controller.
  • the controller also includes an input-output interface 215, a user interface for managing a command input means 216 (keyboard, touch screen, mouse, etc.), a display means 217 (screen, display, indicator light) and possibly, means for emitting a sound signal 218 on an audible frequency, a connector 219 for the electrical power supply, at least one inverter 220 for powering the motor.
  • a command input means 216 keyboard, touch screen, mouse, etc.
  • a display means 217 screen, display, indicator light
  • a connector 219 for the electrical power supply
  • at least one inverter 220 for powering the motor.
  • the screwdriver includes means for measuring at least one piece of information representative of the tightening torque, which is proportional to the torque delivered by the motor. It may for example be a torque sensor 22 with a deforming element carrying strain gauges placed in the transmission, and/or a sensor 23 measuring the current consumed by the motor or other. These measuring means are connected to the controller.
  • the screwdriver also includes means 24 for measuring in real time at least one piece of information representative of the angle of rotation of the terminal member 10 in the casing. It may for example be an angle sensor taking the form of an encoder placed at the level of the motor rotor or elsewhere in the transmission, or other. They in fact make it possible to know the angular position of any element of the transmission knowing the position it occupies in it in relation to the position of the angle measuring means.
  • Such a screwing device is conventionally used to carry out a plurality of successive screwing operations (also called tightening operations).
  • FIG. 7 represents the motor control carried out by the controller.
  • a re-indexing is implemented to place the terminal member in its open position, that is to say in which its opening 101 coincides with that of the casing 11.
  • the screwdriver therefore comprises re-indexing means capable of placing, during a re-indexing step, the terminal member in its open position.
  • These re-indexing means comprise the controller and the means for measuring at least one piece of information representative of the angle of rotation of the terminal member.
  • the controller and the means for measuring at least one piece of information representative of the angle of rotation of the terminal member 10 are capable of determining at least one piece of information representative of the angular position of the terminal member in the casing. in its open position.
  • the controller is able to record this value in its memory as being equal to X. The value in the open position.
  • the controller is programmed to determine, at the end of screwdriving, information representative of the final position of the end member, that is to say the position in which it is at the end of an operation screwing.
  • the controller is capable, via the angle sensor, of measuring an absolute angular position or of counting and/or calculating the integer N of times that the motor travels an angle W between the absolute angular position when the terminal member is in the open position at the start of screwing and the absolute angular position Y of the motor at the end of screwing.
  • This angle value W can be configured in the controller to correspond to the angle to be covered by the motor for the end member to complete a revolution, this without there being any loss of contact between the elements of the transmission.
  • the controller when at the end of screwdriving, an operator orders the controller to carry out a re-indexing operation, the controller is able to act on the motor to return the terminal member essentially to its open position. To do this, it drives the end member, in the direction of screwing, into its open position taking into account the values N and X, measured and/or calculated.
  • the figure 8 represents the angular position of the end member as a function of the angular position of the motor.
  • the controller is able to record a value representative of the angular position X of the motor measured by the angle sensor when the terminal member is in the open position. This value can be recorded in a non-limiting manner during calibration of the device, at the start of screwing after insertion of the device around the tube, at the end of re-indexing, etc.
  • this value is recorded when screwdriving starts. This allows the trigger pull to start tightening to be used as input information that the X position should be recorded.
  • the controller activates the motor to drive the terminal member in the direction of the screwing and tighten the nut for example until an objective tightening torque and/or a tightening angle objective are achieved.
  • the controller stops the motor which is then in a position Y.
  • the end member is also in any angular position Q.
  • the controller controls the motor to return it to position A in the direction of screwing in order to return the end member to its open position.
  • the motor and therefore the end member, is always driven in the direction of screwing. In this way, if during re-indexing, the operator has not disengaged the device from the nut, there is no risk of loosening it.
  • the screwdriving device comprises means for verifying the disengagement of the tool from the nut during the re-indexing phase.
  • the controller is able, during re-indexing, to verify that the tightening torque does not exceed a predetermined threshold torque for non-disengagement. This can be done for example by means of measuring means of information representative of the tightening torque (for example the strain or current gauge sensor). If it detects that the information representing the tightening torque exceeds, during re-indexing, this non-disengagement threshold value, then it deduces that the end member has not been released from the screw or the nut and stops the engine. This ensures that the screwdriving device has been disengaged from the nut so as not to tighten it during re-indexing.
  • a predetermined threshold torque for non-disengagement for example by means of measuring means of information representative of the tightening torque (for example the strain or current gauge sensor). If it detects that the information representing the tightening torque exceeds, during re-indexing, this non-disengagement threshold value, then it deduces that the end member has not been released from the screw or the nut and stops the engine.
  • This embodiment makes it possible to guarantee a return to position of the screwing device in the open position with simple implementation and without risk of harming the tightening quality, that is to say without risk of loosening or over- tightening during re-indexing.
  • the re-indexing means comprise, in addition to the controller and the means for measuring at least one piece of information representative of the angle of rotation of the terminal member, the means for measuring at least one piece of information representative of the tightening torque (also called screwing torque).
  • the return to the rear stop is carried out before carrying out a tightening operation. It can be performed before or after inserting the device around the tube.
  • the controller is able to control the motor in the manner shown in Figure 9 .
  • the controller can drive the motor in the direction of screwing by a predetermined angle K corresponding to an angle of the first pinion 120 allowing the pawl 13 to be placed under the effect of the leaf spring 14 in a position in which it is extends outside the groove 15 so that it is ready to come against the stop 1201 of the first pinion 120 following rotation of the motor in the direction of unscrewing.
  • This angle value K is determined during the design of the device and can be configured in the controller.
  • the controller then drives the motor in the unscrewing direction until the stop of the first pinion 120 comes into contact with the pawl 13 and causes an increase in torque detected by the controller.
  • the controller is then able to record the angular position of the motor as being the position X" when it detects reaching the rear stop threshold.
  • the J value corresponds to the angle traveled by the motor to take up the play in the transmission between the motor and the end member.
  • controlling the motor in the direction of unscrewing up to the stop ensures that the terminal member is in the open position, but also that the transmission is in the position 1.
  • the control of the motor during re-indexing must therefore take into account the value J to be recovered to determine the position A to which to bring the motor. This J value can be determined when designing the screwdriving device and configured in the controller.
  • the Figure 10 presents the angular position of the terminal member as a function of the angular position of the motor, in the case of a return to the stop before screwing.
  • the controller controls the motor to return to the rear stop. To do this, it controls the motor in the direction of screwing by a predetermined angle K in order to cause the first pinion 120 (and therefore the end member) to travel through an angle of between 5 and 15 degrees to trigger the pawl 13 of the system. of stop. The motor is then driven in the direction of unscrewing until the detection of the threshold of rear stop. The end member is then guaranteed to be in the open position and the controller records the value of the angular position of the motor as being the position X".
  • the return to rear stop is carried out at the end of screwing after disengagement of the device from the nut.
  • the controller will then control the motor to return to the rear stop. To do this, the motor is driven in the direction of screwing by a predetermined angle K necessary for triggering the stopper pawl. In order to prevent loosening of the nut during the implementation of the stop return, this angle is relatively small, that is to say it is less than an angle corresponding to the level of the terminal member at a loosening angle of the nut.
  • the motor is then driven in the unscrewing direction until the rear stop threshold is reached.
  • Means for verifying the disengagement of the tool from the nut during the re-indexing phase can also be implemented within a device with a rear stop system.
  • the controller is programmed to carry out each of the steps of a corresponding method according to the invention.
  • the method includes a first step 61 of positioning the device around the tube. In this step, while the screwdriver is in the open position, the operator can pass the tube through the openings 110, 101 of the casing 11 and the terminal member 10 to insert it into the hole 100 of the member terminal 10.
  • a step 62 of engagement with the nut the operator can then make the terminal member cooperate with the nut to be tightened by sliding the device along the tube.
  • a step 63 of tightening the nut can then be implemented.
  • This tightening step is for example started by pressing the operator on the screwdriver trigger.
  • the controller records the absolute angular position X of the motor (step 68).
  • the tightening step is then conventionally managed by the controller 21 according to a screwing strategy pre-programmed therein.
  • At least one piece of information representative of the tightening torque and at least one piece of information representative of the screwing angle of the end member are measured in real time.
  • Screwing continues conventionally until the controller detects that the objective screwing angle and/or the objective tightening torque to which it is desired to tighten the nut has been reached. (s).
  • the controller 21 counts and/or calculates then records (step 630) the integer number N of times that the motor travels an angle W between the position open at the start of screwing and the Y position of the motor at the end of screwing, the angle W being recorded in the controller and corresponding to the angle to be covered by the motor for the terminal member to complete one revolution.
  • the operator can then disengage the end member of the nut (step 64).
  • the screwdriver is generally not in the open position. The operator cannot therefore release the screwdriver from the assembly, the tube remaining trapped in the hole 100 of the terminal member 10.
  • a re-indexing step 65 is consequently implemented so as to place the screwdriver essentially in the open position and allow the operator to disengage the screwdriver from the assembly.
  • the controller 21 controls (step 650) the driving of the terminal member 10 in the screwing direction until the terminal member 10 reaches an open position.
  • the controller then controls the motor to return it, in the direction of screwing, to position A corresponding to the device reaching its open position.
  • a check (step 653) of the disengagement of the screwdriver from the assembly can be implemented. This makes it possible to ensure that the operator has disengaged the terminal member 10 of the nut so that the driving in the screwing direction of the terminal member 10 does not induce over-tightening of the nut.
  • the controller 21 checks whether the screwing torque measured in real time reaches the predetermined threshold value of non-disengagement so as to know whether or not the screwing device is disengaged from the nut (step 653). This value is predetermined to correspond to the detection of over-tightening. As long as this threshold value is not reached, the driving of the end member in the screwing direction towards position A continues. If this predetermined threshold value is reached, then the operator has not disengaged the terminal member 10 from the nut and the controller 21 stops the re-indexing (step 654).
  • the operator can launch a new re-indexing to finalize the unfinished re-indexing.
  • the operator can then remove the device from the tube (step 66).
  • the step of returning to the rear stop 67 is carried out before screwing.
  • this step can for example be implemented before positioning the device around the tube, or even before engaging the terminal member with the nut, etc.
  • step 67 of returning to the rear stop the controller 21 firstly controls the motor to rotate it by a predetermined angle K in the direction of screwing (step 671), then in the direction of unscrewing until until it is in the open position (step 672).
  • the terminal member 10 is rotated in the direction of unscrewing until the stop 1201 comes to rest against the pawl 13 so that the transmission in the unscrewing direction is blocked.
  • the controller compares the measured unscrewing torque to the predetermined torque threshold value at the rear stop and stops the motor when this value is reached.
  • the terminal member 10 is then in the open position.
  • the controller then records (step 673) the angular position of the motor as being position X".
  • the controller then controls the motor to return it, in the direction of screwing, to position A corresponding to the device reaching its open position, then the process continues as in the first embodiment.
  • the step of returning to the rear stop 67' is carried out directly after the re-indexing step.
  • the controller therefore records, when tightening starts, the position X' of the motor corresponding to the open position of the terminal member (68).
  • the controller 21 then triggers the return to stop step 67' in which it first controls the motor to rotate it by a predetermined angle K in the direction of screwing (step 671'), then in the direction of the screwing. unscrewing until it is in the open position (step 672').
  • the terminal member 10 is rotated in the direction of unscrewing until the stop 1201 comes to rest against the pawl 13 so that the transmission in the unscrewing direction is blocked.
  • the controller compares the measured unscrewing torque to the value predetermined torque threshold at rear stop and stops the motor when this value is reached. The terminal member 10 is then in the open position.
  • a method as described above can be implemented by a screwdriving device as shown schematically in Figure 17 .
  • a screwdriving device for example a portable screwdriver as presented previously, comprises a casing (16), a rotary terminal member (10) having a cavity configured to be able to engage with the nut in order to drive the nut rotating to achieve tightening. It also comprises a motor (17) capable of driving the terminal member (10) in rotation.
  • a transmission (18) is conventionally placed between the motor (17) and the end member (10) to achieve a reduction between the rotation of the motor (17) and that of the end member (10).
  • the casing (16) and the terminal member (10) each have a lateral opening allowing, when they coincide, the passage of said tube.
  • the terminal member (10) is in the open position when it is in an angular position in which its lateral opening coincides with that of the casing (16) so as to allow the tube to pass.
  • the device further comprises control means (21) capable of controlling the motor (17) in rotation.
  • control means (21) capable of controlling the motor (17) in rotation.
  • These control means (21) are able in particular to control the motor (17) to carry out one or more predetermined tightening strategy(s). For example, they are able to start the motor (17) in rotation to carry out tightening, and to stop it when information on the end of tightening reaches it (reaching a predefined tightening torque, reaching an angle of predefined tightening, etc).
  • the device can therefore include means for measuring different tightening information to transmit the latter to the control means (21). This may for example be the torque sensor with strain gauges, and the angle sensor as presented previously.
  • control means (21) also comprise re-indexing means (42) capable of returning the terminal member (10) to the open position after tightening, by rotation in the clockwise direction.
  • re-indexing means (42) can be the controller itself or a module integrated into it.
  • the re-indexing means (42) make it possible to remove the tube from the device. This re-indexing is performed clockwise so as not to unscrew the nut if the end member is not removed from the nut.
  • the re-indexing means (42) are able to determine the position A to which to control the motor (17) to return the terminal member (10) to the open position.
  • the re-indexing means (42) comprise recording means (46) of the position X of the motor (17) when the terminal member (10) is in the open position.
  • the re-indexing means (42) are suitable, after a phase in which the terminal member (10) is in the open position (for example after having carried out a re-indexing, or after engagement of the device around the tube), to record the angular position of the motor (17) measured by the angle sensor.
  • the re-indexing means are able to record the angular position X when the operator presses the trigger to initiate the start of tightening.
  • They also include means (47) for measuring and/or calculating the integer number N of times that the motor (17) travels, since the last recorded position (17) when the end member (10) makes a turn.
  • the device comprises a rear stop system comprising means (44) for blocking the rotation of the terminal member (10) in the counterclockwise direction when it is in the open position.
  • This system makes it possible to guarantee a precise open position of the end member (10).
  • the device comprises in this case means (43) for measuring the torque transmitted to the terminal member in the counterclockwise direction. It may for example be a torque sensor with a strain gauge, and in particular the same sensor as that used to measure the tightening torque.
  • the control means (21) are then able to control the motor (17) in the clockwise direction by a parameterized angle K, to control the motor (17) in the counterclockwise direction, and to stop the counterclockwise rotation of the motor (17).
  • the control means (21) are able to implement a phase of verifying the disengagement of the terminal member of the nut when they control the motor (17). clockwise.
  • This phase can be implemented during the re-indexing of the terminal member (10) or during the advancement of the angle K in the case of returning to the stop after tightening has been carried out.
  • the device comprises means (45) for measuring the torque transmitted to the terminal member in a clockwise direction. It may for example be a torque sensor with strain gauges, and in particular the same torque sensor used for measuring the tightening torque of the nut, or for measuring the torque transmitted to the terminal member. counterclockwise in the case of return to the stop.
  • the control means (21) are then able to compare the measured torque to a threshold value and to stop the motor (17) when the measured torque exceeds the threshold value.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Motor Or Generator Frames (AREA)
  • Automatic Assembly (AREA)

Claims (11)

  1. Verfahren zur Verschraubung einer Rohranschlussmutter an einem Element mittels einer Verschraubungsvorrichtung, wobei das Rohr sich durch die Mutter erstreckt, wobei die Vorrichtung ein Gehäuse (16), ein drehbares Endorgan (10), das geeignet ist, mit der Mutter zusammenzuwirken, einen Motor (17) und ein Getriebe umfasst, die geeignet sind, das Endorgan (10) anzutreiben, und ein Betriebsspiel aufweisen, wobei das Gehäuse (16) und das Endorgan (10) jeweils eine seitliche Öffnung aufweisen, die, wenn sie zusammenfallen, den Durchgang des Rohrs in dem Endorgan (10) ermöglichen und somit eine geöffnete Position des Endorgans (10) definieren,
    wobei das Verfahren mindestens einen Verschraubungszyklus umfasst, der mindestens die folgenden aufeinanderfolgenden Schritte umfasst:
    - einen Schritt (61) zum Platzieren der sich in der geöffneten Position befindlichen Vorrichtung um das Rohr, indem das Rohr durch die seitlichen Öffnungen des Gehäuses und des Endorgans (10) geführt wird;
    - einen Schritt (62) zum Ineingriffbringen des Endorgans (10) mit der Mutter;
    - einen Schritt (63) zum Anziehen (3) der Mutter;
    - einen Schritt (64) zum Außereingriffbringen des Endorgans (10) von der Mutter;
    - einen Schritt (66) zum Entfernen der Vorrichtung von dem Rohr;
    dadurch gekennzeichnet, dass das Verfahren zwischen dem Schritt (64) zum Außereingriffbringen des Endorgans aus der Mutter und dem Schritt (66) zum Entfernen der Vorrichtung von dem Rohr einen Schritt (65) zum Neuindexieren umfasst, während dem der Motor das Endorgan (10) in die geöffnete Position rückführt, indem er es in der Richtung der Verschraubung drehbar antreibt,
    wobei die Vorrichtung einen Anschlag umfasst, wobei sich das Getriebe in hinterem Anschlag gegen den Anschlag befindet, wenn sich das Endorgan in der geöffneten Position befindet, nachdem es von dem Motor in Aufschraubrichtung angetrieben wurde, wobei das Verfahren einen Schritt der Echtzeitmessung von mindestens einer Information umfasst, die für ein Aufschraubmoment repräsentativ ist,
    wobei das Verfahren einen Schritt (67, 67') zur Rückkehr zum hinteren Anschlag umfasst, der aufeinanderfolgend Folgendes umfasst:
    - einen Teilschritt (671, 671') zum Antreiben des Motors (17) in der Verschraubungsrichtung um einen vorbestimmten Winkel K;
    - einen Teilschritt (672, 672') zum Antreiben des Motors (17) in der Aufschraubrichtung, bis die Information, die für ein Aufschraubmoment repräsentativ ist, einen vorbestimmten Schwellenwert überschreitet, der dem Inanschlagbringen des Getriebes gegen den Anschlag entspricht, wobei das Endorgan sich in der geöffneten Position befindet,
    wobei der Schritt (67, 67') zur Rückkehr zum hinteren Anschlag dem Schritt (63) zum Anziehen vorgeschaltet oder im Anschluss an den Schritt (65) zum Neuindexieren durchgeführt wird.
  2. Verfahren nach Anspruch 1, das beim Start des Verschraubungsschritts (63) einen Schritt (68) zum Aufzeichnen einer Absolutwinkelposition X' des Motors (17) umfasst, die einer geöffneten Winkelposition O des Endorgans (10) entspricht, wobei das Betriebsspiel in der Aufschraubrichtung ausgeglichen wird, wobei der Schritt (65) zum Neuindexieren einen Schritt zur Steuerung des Motors (651) im Uhrzeigersinn zu einer Absolutwinkelposition A umfasst, derart dass: A = X ′ + N + 1 W + J
    Figure imgb0009
    wobei W ein vorbestimmter Winkelwert ist, der dem Winkel entspricht, der vom Motor (17) zurückgelegt wird, wenn das Endorgan (10) eine Umdrehung ausführt;
    J ein vorbestimmter Winkelwert ist, der dem Winkel entspricht, der vom Motor zwischen der Position, in der das Spiel in der Aufschraubrichtung ausgeglichen wird, und der Position zurückgelegt wird, in der das Spiel in der Verschraubungsrichtung ausgeglichen wird;
    N die Ganzzahl der Male ist, die der Winkel W von dem Motor (17) zwischen der Absolutwinkelposition X' + J und seiner Absolutwinkelposition Y am Ende des Verschraubungsschritts (63) zurückgelegt wird.
  3. Verfahren nach Anspruch 1, das einen Schritt (673) zur Aufzeichnung einer Absolutwinkelposition X" des Motors (17) umfasst, die einer geöffneten Winkelposition O des Endorgans (10) entspricht, die nach dem Inanschlagbringen des Getriebes gegen den Anschlag am Ende des Teilschritts (672) zum Antreiben des Motors (17) in der Aufschraubrichtung erhalten wird, wobei das Betriebsspiel in der Aufschraubrichtung ausgeglichen wird, wobei der Schritt (65) zum Neuindexieren einen Schritt zum Steuern des Motors (652) im Uhrzeigersinn zu einer Absolutwinkelposition A umfasst, derart dass: A = X " + N + 1 W + J
    Figure imgb0010
    wobei W ein vorbestimmter Winkelwert ist, der dem Winkel entspricht, der vom Motor (17) zurückgelegt wird, wenn das Endorgan (10) eine Umdrehung ausführt;
    J ein vorbestimmter Winkelwert ist, der dem Winkel entspricht, der vom Motor zwischen der Position, in der das Spiel in der Aufschraubrichtung ausgeglichen wird, und der Position zurückgelegt wird, in der das Spiel in der Verschraubungsrichtung ausgeglichen wird;
    N die Ganzzahl der Male ist, die der Winkel W von dem Motor (17) zwischen der Absolutwinkelposition X" + J und seiner Absolutwinkelposition Y am Ende des Schritt (63) zum Anziehen zurückgelegt wird.
  4. Verfahren nach einem der Ansprüche 1 bis 3, wobei der Schritt (65) zum Neuindexieren eine Phase (653) zur Überprüfung umfasst, dass der Bediener das Endorgan (10) aus der Mutter außer Eingriff gebracht hat.
  5. Verfahren nach Anspruch 4, wobei die Phase (653) zur Überprüfung umfasst:
    - eine Echtzeitmessung mindestens einer Information, die für das auf das Endorgan (10) angewandte Verschraubungsmoment repräsentativ ist;
    - einen Vergleich der mindestens einen Information, die für das gemessene Moment repräsentativ ist, mit einem vorbestimmten Außereingriffsschwellenwert,
    - ein Anhalten des Schritt (65) zum Neuindexieren, wenn die mindestens eine Information, die für das gemessene Moment repräsentativ ist, höher als der Schwellenwert wird.
  6. Vorrichtung zur Verschraubung einer Rohranschlussmutter an einem Element, wobei das Rohr sich durch die Mutter erstreckt, wobei die Vorrichtung ein Gehäuse (16), ein drehbares Endorgan (10), das geeignet ist, mit der Mutter zusammenzuwirken, einen Motor (17) und ein Getriebe umfasst, die geeignet sind, das Endorgan anzutreiben, und ein Betriebsspiel aufweisen, wobei das Gehäuse (16) und das Endorgan (10) jeweils eine seitliche Öffnung aufweisen, die, wenn sie zusammenfallen, den Durchgang des Rohrs ermöglichen und somit eine geöffnete Position des Endorgans definieren,
    wobei die Vorrichtung zum Durchführen von aufeinanderfolgenden Verschraubungszyklen eingesetzt werden kann und Steuerungsmittel (21) umfasst, die geeignet sind, den Motor (17) drehbar zu steuern, um das Verschrauben der Mutter auszuführen,
    die Vorrichtung Neuindexierungsmittel (42) umfasst, die geeignet sind, das Endorgan (10) am Ende eines Anziehens durch eine Drehung in der Verschraubungsrichtung in die geöffnete Position zurückzuführen,
    dadurch gekennzeichnet, dass die Vorrichtung Folgendes umfasst:
    - Mittel (43) zum Messen mindestens einer Information, die für das auf das Endorgan (10) übertragene Aufschraubmoment repräsentativ ist,
    - einen Anschlag, wobei das Getriebe sich im hinteren Anschlag gegen den Anschlag befindet, wenn das Endorgan sich in der geöffneten Position befindet, nachdem es von dem Motor in der Aufschraubrichtung angetrieben wurde,
    wobei die Steuerungsmittel (21) während eines Verschraubungszyklus für Folgendes geeignet sind:
    - Steuern des Motors (17) um einen vorbestimmten Winkel K in der Verschraubungsrichtung;
    - Steuern des Motors (17) in der Aufschraubrichtung, bis die Information, die für ein Aufschraubmoment repräsentativ ist, einen vorbestimmten hinteren Anschlagsschwellenwert überschreitet, welcher dem Inanschlagbringen des Getriebes gegen den Anschlag entspricht, wobei das Endorgan sich in der geöffneten Position befindet.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Neuindexierungsmittel (42) Folgendes umfassen:
    - Mittel (46) zur Aufzeichnung der Absolutwinkelposition X, X" des Motors, wenn das Endorgan (10) sich in der geöffneten Position befindet und das Betriebsspiel in der Aufschraubrichtung ausgeglichen wird;
    - Mittel zur Messung und/oder zur Berechnung (47) der Ganzzahl N der Male, die der Motor (17) ausgehend von der Absolutwinkelposition X', X" einen vorbestimmten Winkel W zurücklegt, der dem Winkel entspricht, der von dem Motor (17) zurückgelegt wird, wenn das Endorgan (10) eine Umdrehung durchführt;
    wobei die Neuindexierungsmittel geeignet sind, den Motor (17) zu einer Absolutwinkelposition A = X', X" + (N+1)W + J zu steuern, um das Endorgan (10) in die geöffnete Position rückzuführen, wobei J ein vorbestimmter Winkelwert ist, der dem Winkel entspricht, der von dem Motor zwischen der Position, in der das Spiel in der Aufschraubrichtung ausgeglichen wird, und der Position zurückgelegt wird, in der das Spiel in der Verschraubungsrichtung ausgeglichen wird.
  8. Vorrichtung nach einem der Ansprüche 6 bis 7, dadurch gekennzeichnet, dass sie Folgendes umfasst:
    - Mittel (45) zur Messung mindestens einer Information, die für das an das Endorgan in der Verschraubungsrichtung übertragene Moment repräsentativ ist;
    - Mittel zur Überprüfung des Außereingriffbringens des Endorgans aus der Mutter, wenn die Steuerungsmittel den Motor (17) in der Verschraubungsrichtung steuern, wobei die Mittel zur Überprüfung des Außereingriffbringens des Endorgans aus der Mutter für Folgendes geeignet sind:
    - Vergleichen des gemessenen Moments mit einem vorbestimmten Außereingriffsschwellenwert;
    - Anhalten des Motors (17), wenn das gemessene Moment den Außereingriffsschwellenwert überschreitet.
  9. Vorrichtung nach einem der Ansprüche 6 bis 8, die ferner eine Steuereinrichtung umfasst.
  10. Computerprogrammprodukt, das Programmcodeanweisungen zur Durchführung eines Verfahrens nach einem der Ansprüche 1 bis 5 umfasst, wenn das Programm auf der Steuereinrichtung einer Vorrichtung zur Verschraubung nach Anspruch 9 ausgeführt wird.
  11. Nichtflüchtiger maschinenlesbarer Datenträger, der ein Computerprogrammprodukt nach Anspruch 10 speichert.
EP18215453.4A 2017-12-27 2018-12-21 Verschraubungsverfahren einer mutter um ein rohr, das eine neuindexierung umfasst, und entsprechende vorrichtung Active EP3505301B1 (de)

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CN215617726U (zh) * 2018-10-26 2022-01-25 米沃奇电动工具公司 动力棘轮工具
CN111503436B (zh) * 2020-04-23 2021-11-09 苏州浪潮智能科技有限公司 一种调平装置及系统
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US3987692A (en) * 1975-06-16 1976-10-26 Chicago Pneumatic Tool Company Tube nut wrench
US4064772A (en) * 1976-07-06 1977-12-27 Cooper Industries, Inc. Tubing wrench with air powered return
EP0636458B1 (de) * 1993-06-04 1998-03-11 Ohmi, Tadahiro Spannvorrichtung
DE19704789A1 (de) * 1996-02-16 1997-08-21 Volkswagen Ag Montage von Kraftstoffeinspritzleitungen
JP2001150360A (ja) * 1999-11-24 2001-06-05 Osamu Katai 鉄筋のジョイント金具の締付け具
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US20130305887A1 (en) * 2011-01-31 2013-11-21 Jim LAI Pivoting structure of a tool
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US9381625B2 (en) * 2012-12-29 2016-07-05 Chevron (Hk) Limited Electrical wrench

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