JP2009214229A - Nutrunner support - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nut runner support unit capable of easily managing following performance of a nut runner. <P>SOLUTION: The nut runner support unit 70 is mounted to a robot arm 33 and supports the nut runner 71. The nut runner support unit 70 is provided with a base part 72 mounted to the robot arm 33; and a frame 73 turnably supported on the base part 72 and supporting the nut runner 71. A bolt 723 is thread-engaged with the base part 72, and a storage part 734 for storing the bolt 723 is formed on the frame 73. A shock-absorbing material 735 is interposed between an inner surface of the storage part 734 and an outer surface of the bolt 723. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a nutrunner support. Specifically, the present invention relates to a nutrunner support that is attached to a robot arm and supports a nutrunner.

Conventionally, in a manufacturing process of an automobile, a door is temporarily fixed to a body with a bolt, and coating is performed in this state. Thereafter, the bolt is removed, and the door is gripped and transported to remove the door from the body, and the body and the door are assembled on separate lines.
Here, on the line for removing the door from the body, for example, a robot having a nut runner attached to the tip is installed. When removing the door from the body, the robot arm of this robot is controlled so that the socket of the nut runner is fitted to the bolt, and then the nut runner is driven to loosen and remove the bolt (see Patent Document 1).

  However, even if an attempt is made to remove the bolt with the nut runner, the position of the bolt may deviate from a predetermined reference position. In this case, the nut runner needs to follow the displacement of the bolt.

  Therefore, a nutrunner support device that is attached to the robot arm and supports the nutrunner via a spring or elastic rubber has been proposed (see Patent Document 1). Specifically, a through hole is formed in the support device, and the shaft of the nut runner is inserted into the through hole. Elastic rubber is interposed between the through hole and the shaft, and the support device is provided with a spring that biases the nut runner shaft in the axial direction.

According to this method, the nut runner can follow the displacement of the bolt by deforming the spring or the elastic rubber.
JP-A-6-155191

  However, the amount of deformation of the spring or elastic rubber varies greatly depending on the characteristics. Therefore, it is difficult to manage the follow-up performance of the nutrunner with the above method.

  An object of this invention is to provide the nut runner support which can manage the following performance of a nut runner easily.

  The nutrunner support of the present invention (for example, a nutrunner support 70 described later) is a nutrunner support that is attached to a robot arm (an arm 33 described later) and supports a nutrunner (for example, a nutrunner 71 described later), A base (to be described later, base 72) attached to the robot arm, and a support (to be described later, frame 73) that is rotatably supported by the base and supports the nutrunner. A bolt 723 described later is formed, and a storage portion (a storage portion 734 described later) in which the protrusion is stored is formed in the support portion, and between the inner surface of the storage portion and the outer surface of the protrusion, A cushioning material (a cushioning material 735 described later) is interposed.

  In this case, it is preferable that the protrusion is a bolt, and the cushioning material is cylindrical and is disposed so as to surround a neck portion of the bolt.

According to this invention, the protrusion is formed on the base, the accommodating portion in which the protrusion is accommodated is formed on the support portion, and the buffer material is interposed between the inner surface of the accommodating portion and the outer surface of the protrusion. Therefore, when fitting the nut runner socket to the bolt head, even if the bolt position is deviated from the reference position, the support material supporting the nut runner is slightly rotated with respect to the base by deforming the cushioning material. Thus, the nut runner can follow the displacement of the bolt.
Further, since the rotation amount of the nut runner is substantially equal to the deformation amount of the buffer material, the follow-up performance of the nut runner can be easily adjusted by appropriately selecting the thickness and material of the buffer material.

  According to the present invention, the protrusion is formed on the base, the accommodating portion in which the protrusion is accommodated is formed on the support portion, and the cushioning material is interposed between the inner surface of the accommodating portion and the outer surface of the protrusion. Therefore, when fitting the nut runner socket to the bolt head, even if the bolt position is deviated from the reference position, the support material supporting the nut runner is slightly rotated with respect to the base by deforming the cushioning material. Thus, the nut runner can follow the displacement of the bolt. Further, since the rotation amount of the nut runner is substantially equal to the deformation amount of the buffer material, the follow-up performance of the nut runner can be easily adjusted by appropriately selecting the thickness and material of the buffer material.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a door removal system 1 to which a nutrunner support according to an embodiment of the present invention is applied.
The door removal system 1 removes a door 11 temporarily fixed to a vehicle body 10 with bolts 12 from the body 10. The door removal system 1 includes a double-arm robot 20 that sandwiches the door 11 from above and below, a single-arm robot 30 that removes the bolt 12, and a control device 40 (see FIG. 4) that controls them.

A door 11 is attached to the body 10 of the automobile via a pair of upper and lower hinge members 13 and 14.
Each of the pair of hinge members 13 and 14 is fixed to the body 10 and is temporarily fixed to the end surface on one end side in the length direction of the door 11 with one bolt 12.
The door 11 is formed by joining an inner panel 15 and an outer panel 16.
The inner panel 15 includes a substantially flat rectangular panel main body 151 and a substantially U-shaped frame portion 152 provided at the upper end of the panel main body 151. A region surrounded by the frame portion 152 and the upper side of the panel body 151 is an opening through which a window glass (not shown) is exposed.
The outer panel 16 is attached to the outside of the panel body 151 of the inner panel 15. A gap for accommodating the window glass is formed between the upper side of the outer panel 16 and the upper side of the panel main body 151 of the inner panel 15.

The double-arm robot 20 includes a robot main body 21, and a first manipulator 22A and a second manipulator 22B provided with the robot main body 21 interposed therebetween.
The manipulators 22A and 22B have seven axes. The arms 23A and 23B are pivotally supported by the robot main body 21, and the first gripping jig 50 and the first gripping jig 50 pivotally supported by the front end flange surfaces 24A and 24B of the arms 23A and 23B. 2 gripping jigs 60.

  The robot body 21 includes a slide portion 211 that can slide in a predetermined direction with respect to the floor surface, and a turning portion 212 that can turn around the turning portion 213 about a substantially vertical direction.

The slide portion 211 is slidable in the transport direction of the body 10 of the automobile, that is, in the direction of arrow A in FIG.
The slide portion 211 is provided with a torque sensor 214 that detects torque acting on the turning shaft 213. Specifically, the torque sensor 214 detects torque that acts on the rotating shaft of the motor that drives the turning shaft 213.

  The swivel unit 212 is provided with load sensors 215A and 215B that detect loads acting on the manipulators 22A and 22B in the vertical direction.

  The arms 23A and 23B are, in order from the robot body 21 side, the first arm part 231, the second arm part 232, the third arm part 233, the fourth arm part 234, the fifth arm part 235, and the sixth arm part 236. Is provided.

The first arm portion 231 extends substantially linearly and is pivotally supported by the robot body 21. The robot body 21 rotates the first arm portion 231 around a rotation axis 216 extending in a substantially horizontal direction.
The rotation shaft 216 of the first arm portion 231 of the arm 23A and the rotation shaft 216 of the first arm portion 231 of the arm 23B are located on the same straight line.
The load sensors 215A and 215B described above detect torque that acts on the rotation shafts of the motors that drive the rotation shafts 216.

The second arm portion 232 extends substantially linearly and is pivotally supported by the first arm portion 231. The first arm portion 231 rotates the second arm portion 232 about a direction intersecting the extending direction of the first arm portion 231 by a driving mechanism (not shown). As a result, the angle formed between the extending direction of the first arm portion 231 and the extending direction of the second arm portion 232 changes.
The third arm portion 233 extends substantially linearly and is pivotally supported by the second arm portion 232. The second arm portion 232 rotates the third arm portion 233 by using a driving mechanism (not shown) around the extending direction of the second arm portion 232 as the rotation center.

The fourth arm portion 234 extends substantially linearly and is pivotally supported by the third arm portion 233. The third arm portion 233 rotates the fourth arm portion 234 with a driving mechanism (not shown) about the direction intersecting the extending direction of the third arm portion 233 as the rotation center. As a result, the angle formed between the extending direction of the third arm portion 233 and the extending direction of the fourth arm portion 234 changes.
The fifth arm portion 235 extends substantially linearly and is pivotally supported by the fourth arm portion 234. The fourth arm portion 234 rotates the fifth arm portion 235 about the extending direction of the fourth arm portion 234 as a rotation center by a driving mechanism (not shown).

  The sixth arm 236 extends substantially linearly and is pivotally supported by the fifth arm 235. The fifth arm 235 rotates the sixth arm 236 with a driving mechanism (not shown) around the direction intersecting the extending direction of the fifth arm 235 as the rotation center. As a result, the angle formed between the extending direction of the fifth arm 235 and the extending direction of the sixth arm 236 changes.

  The first gripping jig 50 and the second gripping jig 60 are pivotally supported on the sixth arm portion 236 by the tip flange surfaces 24A and 24B of the arms 23A and 23B. The sixth arm 236 rotates the first gripping jig 50 and the second gripping jig 60 about the extending direction of the sixth arm 236 by using a driving mechanism (not shown).

FIG. 2A is a perspective view of the first gripping jig 50.
The first gripping jig 50 includes a support portion 51 attached to the distal end flange surface 24A of the arm 23A, a substantially U-shaped locking portion 52 supported by the support portion 51, a laser measurement device (not shown), and .

  The locking portion 52 includes a frame 53 attached to the distal end flange surface 24 </ b> A of the arm 23 </ b> A, a urethane buffer portion 54 provided on the surface of the frame 53, and a projection provided from the buffer portion 54 provided on the frame 53. A door opening pin 55.

  The frame 53 is substantially L-shaped, and is provided with a plate-like first frame 531 that extends substantially parallel to the front end flange surface 24 </ b> A, and one end side of the first frame 531, and the first frame 531. A plate-like second frame 532 extending in a substantially orthogonal direction.

The buffer portion 54 includes a first buffer portion 541 provided along the inner surface of the first frame 531, a second buffer portion 542 provided along the inner surface of the second frame 532, and the second buffer portion 542. A third buffer portion 543 provided on the front end side of the buffer portion 542 and extending so as to face the first buffer portion 541.
The door opening pin 55 is provided on the second frame 532 and protrudes from the surface of the second buffer portion 542.

FIG. 2B is a perspective view of the second gripping jig 60.
The second gripping jig 60 includes a support portion 61 attached to the front end flange surface 24B of the arm 23B, and a pair of substantially parallel L-shaped locking portions 62 supported on both ends of the support portion 61. And comprising.
Each of the locking portions 62 has the same configuration as that of the locking portion 52 of the first gripping jig 50, except that a door opening pin is not provided.

Returning to FIG. 1, the single-arm robot 30 includes a robot body 31 and a single manipulator 32 provided on the robot body 31.
The manipulator 32 has seven axes, and includes an arm 33 provided on the robot body 31 and a nut runner 71 supported on the tip of the arm 33 via a nut runner support 70.
The robot body 31 and the arm 33 of the single-arm robot 30 have the same configuration as the robot body 31 and the arms 23A and 23B of the double-arm robot 20, but the slide portion 211 of the single-arm robot 30 is in the direction of arrow A in FIG. It is different from the slide part 211 of the double-arm robot 20 in that it can only slide.

FIG. 3 is a plan view and a side view of the nut runner 71 and the nut runner support 70.
The nut runner 71 includes a socket 711 and a nut runner main body 712 that rotationally drives the socket 711.
The socket 711 is provided on the distal end side of the nut runner main body 712, and the rotation axis C of the socket 711 intersects the extending direction of the nut runner main body 712.

  The nut runner support 70 includes a base portion 72 attached to the distal end flange surface 34 of the arm 33, and a frame 73 as a support portion that is rotatably supported by the base portion 72 and supports the nut runner 71.

The base 72 includes a disc-shaped main body 721 extending along the front end flange surface 34 </ b> A, and bolts 723 as four protrusions protruding from the main body 721.
An insertion hole 722 extending along the central axis R of the front end flange surface 34 is formed in the center of the main body 721. A radial bearing 724 is provided on the inner wall surface of the insertion hole 722, and a thrust bearing 725 is provided on the frame 73 side of the insertion hole 722.
The four bolts 723 are screwed into the main body 721 and are arranged in an annular shape around the shaft portion 722.

  The frame 73 has a substantially L-shaped cross section, and has a flat plate-like first frame 731 extending along the tip flange surface 34, a flat plate-like second frame 732 erected on the first frame 731, and And a shaft portion 733 fixed through the first frame 731.

The first frame 731 is formed with four accommodating portions 734 in which the bolts 723 of the base portion 72 are accommodated.
The shaft portion 733 is inserted into the insertion hole 722 of the base portion 72 and supported by the radial bearing 724 and the thrust bearing 725. As a result, the frame 73 is rotatably supported by the base 72 with the central axis R as the center of rotation.

  A cylindrical cushioning material 735 disposed around the neck of the bolt 723 is disposed on the inner wall surface of each housing portion 734. The buffer material 735 is made of elastically deformable urethane, and is interposed between the inner wall surface of the housing portion 734 and the outer peripheral surface of the neck portion of the bolt 723.

  The second frame 732 supports the nut runner main body 712 so that the nut runner 71 extends along the tip flange surface 34A. Thereby, the rotation axis C of the socket 711 of the nut runner 71 is substantially parallel to the central axis R of the tip flange surface 34 of the arm 33.

The nut runner support 70 described above operates as follows.
As described above, the frame 73 is rotatable with respect to the base portion 72 with the central axis R as the rotation center. However, since the bolt 723 of the base portion 72 is housed in the housing portion 734 of the frame 73, the rotation of the frame 73 with respect to the base portion 72 is restricted by the bolt 723.

Here, since the cushioning material 735 is provided between the bolt 723 and the housing portion 734, when the frame 73 is rotated with respect to the base portion 72, the cushioning material 735 is connected to the inner wall surface of the housing portion 734 and the bolt 723. It is elastically deformed by being pressed with the outer peripheral surface of the neck portion of the. Therefore, the amount of rotation of the frame 73 with respect to the base 72 is equal to the amount of elastic deformation of the cushioning material 735.
Since the rotation axis C of the socket 711 of the nut runner 71 is parallel to the central axis R of the front end flange surface 34, the socket 711 rotates slightly with respect to the front end flange surface 34 of the arm 33.

FIG. 4 is a block diagram illustrating a schematic configuration of the control device 40.
The control device 40 includes a door opening portion 41 that opens the door 11 with the manipulator 22A of the double-arm robot 20, a door holding portion 42 that holds the door 11 from above and below with the manipulators 22A and 22B of the double-arm robot 20, and the single-arm robot 30. The bolt removal part 43 which removes the volt | bolt 12 and the door conveyance part 44 which conveys the door 11 with the double arm robot 20 are provided.

  The door opening portion 41 inserts the door opening pin 55 of the first gripping jig 50 of the manipulator 22 </ b> A into the gap between the outer panel 16 and the inner panel 15 of the door 11, and moves the door 11 toward the outside of the body 10. By pulling, the door 11 opens.

  The door clamping unit 42 clamps the door 11 from above and below with the first gripping jig 50 of the manipulator 22A and the second gripping jig 60 of the manipulator 22B. When the door 11 is clamped, a reaction force acting on the manipulators 22A and 22B is detected by a force sensor (not shown), and the manipulators 22A and 22B are feedback-controlled based on the detected reaction force.

The bolt removing unit 43 controls the single arm robot 30 to fit the socket of the nut runner 71 to the bolt 12 and drive the nut runner 71 to remove the bolt 12. Here, the bolt removing unit 43 loosens and removes the upper bolt 12 from the pair of upper and lower bolts 12 and then loosens and removes the lower bolt 12.
Further, when the bolt 12 is loosened, the high torque range of the tightening torque of the bolt 12 is relaxed by rotating the arm 33 around the socket 711 of the nut runner 71, and then the nut runner 71 is driven to Relax the low torque range of the tightening torque.

The door conveyance unit 44 detects the load applied to the manipulator 22B, in this case, the one that supports the lower side of the door 11 among the pair of manipulators 22A and 22B by the load sensor 215B.
Specifically, the rotating shaft other than the rotating shaft 216 is locked with respect to the manipulator 22B, and the torque acting on the motor that drives the rotating shaft 216 of the manipulator 22B is detected by the load sensor 215B. In the present embodiment, the torque acting on the rotating shaft 216 is detected by the load sensor 215B. However, the present invention is not limited to this, and the torque acting on the rotating shaft 216 is based on the current value of the motor that drives the rotating shaft 216. May be calculated.
Then, only when the detected load is equal to or greater than a predetermined value, the turning of the turning shaft 213 of the robot body 21 is started, and the conveyance of the door 11 is started by the pair of manipulators 22A and 22B.

  Further, when turning the turning shaft 213 of the double-arm robot 20, the torque acting on the turning shaft 213 is detected by the torque sensor 214, and when the detected torque is equal to or greater than a predetermined value, the turning of the double-arm robot 20 is performed. To stop. In this embodiment, the torque acting on the turning shaft 213 is detected by the torque sensor. However, the present invention is not limited to this, and the torque acting on the turning shaft 213 is determined based on the current value of the motor that drives the turning shaft 213. It may be calculated.

Hereinafter, the operation of the door removal system 1 will be described with reference to the flowchart of FIG.
First, the body 10 is conveyed on the line and supplied to the door removal system 1. In this state, the door 11 is in a closed state.

First, in ST10, the single-arm robot 30 is located at the original position.
In ST11, the slide unit 211 of the single-arm robot 30 is slid to move the manipulator 32 outside the opening / closing range of the door 11, and in ST12, the single-arm robot 30 is put on standby.

On the other hand, in ST0, the double-arm robot 20 is located at the original position.
In ST1, the slide unit 211 of the double-arm robot 20 is slid to move the manipulators 22A and 22B to positions where the door 11 is gripped.
In ST2, the position of the door 11 is measured by a laser measuring device (not shown) provided in the first manipulator 22A of the double-arm robot 20.

In ST3, the motion taught in advance is corrected based on the measured position of the door, and the door 11 is opened by the first manipulator 22A of the double-arm robot 20.
Specifically, as shown in FIG. 6, the first manipulator 22 </ b> A is driven so that the door opening pin 55 of the first gripping jig 50 is connected to the upper side of the outer panel 16 of the door 11 and the panel body 151 of the inner panel 15. While being inserted into the gap with the upper side, the third buffer portion 543 of the locking portion 52 is locked to the upper side of the panel body 151 of the inner panel 15, and the door 11 is pulled toward the outside of the body 10. Then, the door 11 opens and the lower side of the door 11 is exposed.

In ST4, the door 11 is gripped by the first manipulator 22A and the second manipulator 22B of the double-arm robot 20 based on the measured position of the door 11.
Specifically, as shown in FIG. 7, the second manipulator 22B is driven to lock the third buffer portion 543 of the locking portion 62 of the second gripping jig 60 on the lower side of the door 11, and The lower side of the door 11 is supported by the second buffer portion 542 of the stop portion 62. In this state, the buffer part 54 of the first gripping jig 50 and the buffer part 54 of the second gripping jig 60 are in a state of being opposed to each other with the door 11 being sandwiched up and down. From this state, the door 11 is clamped by the first manipulator 22A and the second manipulator 22B by bringing the first gripping jig 50 and the second gripping jig 60 closer to each other.

  In ST5, the dual-arm robot 20 is put on standby while the door 11 is gripped by the first manipulator 22A and the second manipulator 22B of the dual-arm robot 20.

  On the other hand, in ST13, after the door 11 is gripped by the double-arm robot 20, the slide unit 211 of the single-arm robot 30 is slid to move the manipulator 32 to a position where the bolt 12 is loosened.

  In ST14, based on the measured position of the door 11, as shown in FIG. 8, the socket of the nut runner 71 is fitted to the bolt 12 of the hinge members 13 and 14, the nut runner 71 is driven, and the upper and lower bolts 12 are moved. Loosen and remove. Here, the bolt 12 of the upper hinge member 13 and the bolt 12 of the lower hinge member 14 are removed in this order.

  Specifically, as shown in FIG. 9, first, the socket 711 of the nut runner 71 is fitted to the bolt 12. Here, the socket 711 is slightly rotated with respect to the central axis R of the distal end flange surface 34 of the arm 33. At the same time, the arm 33 is controlled so that the socket 711 is pressed in the direction of the central axis R of the front end flange surface 34 and is allowed to float in the W-axis direction (see FIG. 3) which is the length direction of the nut runner 71. Thereby, the socket 711 is made to follow the positional deviation of the bolt 12. Thereafter, as indicated by an arrow in FIG. 8, the arm 33 is rotated about the rotation axis C of the socket 711 of the nut runner 71 to loosen the high torque range of the tightening torque of the bolt 12. Is driven and the low torque range of the tightening torque of the bolt 12 is relaxed. In this way, the bolt 12 is removed as shown in FIG.

  In ST15, the manipulator 32 of the single-arm robot 30 is moved outside the transfer path of the door 11 by the double-arm robot 20, and in ST16, the slide unit 211 of the single-arm robot 30 is slid to return to the original position.

  On the other hand, in ST6, it is determined whether or not the bolt has been removed. Here, a load acting on the second manipulator 22B is detected by the load sensor 215B, and when the detected load is a predetermined value or more, it is determined that the connection between the door and the body is released. If this determination is NO, the process returns to ST5, and if YES, the process proceeds to ST7.

In ST7, as shown in FIG. 11, the turning shaft 213 of the double-arm robot 20 is turned, and the sliding portion 211 of the double-arm robot 20 is slid in the arrow direction B in FIG. Transport.
Here, when turning the turning shaft 213 of the double-arm robot 20, the torque acting on the turning shaft 213 is detected by the torque sensor 214, and when the detected torque is equal to or greater than a predetermined value, Stop turning.
In ST8, the door 11 is placed on the pallet by the double-arm robot 20, and in ST9, the slide portion 211 of the double-arm robot 20 is slid to return to the original position.

According to this embodiment, there are the following effects.
(1) Bolts 723 are protruded from the base portion 72 to form a housing portion 734 in which the bolts 723 are housed in the frame 73, and a cushioning material is provided between the inner wall surface of the housing portion 734 and the outer peripheral surface of the neck portion of the bolt 723 735. Therefore, when the socket 711 of the nut runner 71 is fitted to the head of the bolt 12, even if the position of the bolt 12 is deviated from the reference position, the shock absorber 735 is deformed, so that the frame 73 that supports the nut runner 71 is The nut runner 71 can be made to follow the positional deviation of the bolt 12 by being slightly rotated with respect to 72.
Further, since the rotation amount of the nut runner 71 is substantially equal to the deformation amount of the buffer material 735, the follow-up performance of the nut runner 71 can be easily adjusted by appropriately selecting the thickness and material of the buffer material 735.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

It is a perspective view of the door removal system concerning one embodiment of the present invention. It is a perspective view of the 1st holding jig and the 2nd holding jig of the door removal system concerning the embodiment. It is the top view and side view of the nut runner and nut runner support of the door removal system which concern on the said embodiment. It is a block diagram which shows schematic structure of the control means of the door removal system which concerns on the said embodiment. It is a flowchart of operation | movement of the door removal system which concerns on the said embodiment. It is a perspective view which shows the state which latched the 1st holding jig of the door removal system which concerns on the said embodiment to the door. It is a perspective view which shows the state which hold | gripped the door with the double arm robot of the door removal system which concerns on the said embodiment. It is a perspective view which shows the state which has removed the volt | bolt with the single arm robot of the door removal system which concerns on the said embodiment. It is a perspective view which shows the state before removing a volt | bolt with the nutrunner of the single arm robot which concerns on the said embodiment. It is a perspective view which shows the state after removing a volt | bolt with the nutrunner of the single arm robot which concerns on the said embodiment. It is a perspective view which shows the state which is conveying the door with the double arm robot of the door removal system which concerns on the said embodiment.

Explanation of symbols

33 Arm 70 Nutrunner support 71 Nutrunner 72 Base 73 Frame (support)
723 bolts 734 housing part 735 cushioning material

Claims (2)

A nutrunner support attached to the robot arm and supporting the nutrunner,
A base attached to the robot arm;
A support portion that is rotatably supported by the base portion and supports the nutrunner;
A protrusion is formed on the base,
The support part is formed with an accommodating part for accommodating the protrusion,
A nut runner support, wherein a cushioning material is interposed between the inner surface of the housing portion and the outer surface of the protrusion. The nutrunner support according to claim 1,
The protrusion is a bolt;
The nut runner support according to claim 1, wherein the cushioning material has a cylindrical shape and is disposed so as to surround a neck portion of the bolt.

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