JP2010249243A - Torque limiter and wire feeding auxiliary device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire feeding auxiliary device capable of confirming and regulating wire feeding force by a lug of housing exterior. <P>SOLUTION: The wire feeding auxiliary device is configured so that one part is located inside a housing and other part is located outside the housing and is configured so as to provide a torque limiter which is provided with a moving member capable of linearly moving in direction from a housing interior to the housing exterior or in a direction from the housing exterior to the housing interior, a passive member which changes the direction of motion of the moving member and changes the distance between a pole permanent magnet plate and a hysteresis material, a lug portion for moving the moving member which is provided on outside the housing of the moving member and moves together with the moving member and a scale which includes a plurality of scales for indicating position of the lug portion. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a welding wire feeding device that feeds a welding wire to a welding torch, and more particularly, to a wire feeding assistance device for assisting in feeding a welding wire.

  2. Description of the Related Art Conventionally, a feeding system in which a main wire feeding device and a wire feeding auxiliary device are provided in the middle of a path from a welding wire storage container to a welding torch is known. And, by adjusting the wire feeding force of the wire feeding auxiliary device to an appropriate feeding force, the feeding resistance of the wire feeding path is reduced, and the welding wire is fed to the welded portion with high accuracy by the main wire feeding device. Was.

  The wire feeding auxiliary device is equipped with, for example, a torque limiter (hereinafter simply referred to as a torque limiter) constituted by a magnetic coupling, and the wire feeding speed of the main wire feeding device is adjusted by the action of the torque limiter. It does not depend on the welding wire, and a certain wire feeding force is applied to the welding wire to reduce the feeding load of the feeding path.

  As such a conventional wire feeding auxiliary device, as shown in FIG. 7, a device including a motor and a torque limiter is known (for example, see Patent Document 1).

  In the conventional wire feeding assist device shown in FIG. 7, an input side case 304 of a torque limiter 303 that is housed in a housing and protected by a cover is attached to a shaft 302 of an electric motor 301 via a joint 305. Further, a feed roller 307 having a groove for feeding the welding wire is attached to the output side shaft 306 of the torque limiter. A structure in which the welding wire is sandwiched between the feeding roller 307 and the pressure roller 308 paired with the feeding roller 307, and the welding wire is fed with a constant force by a constant rotational torque adjusted by the torque limiter 303. It has become.

  Here, the detailed structure of the torque limiter of the conventional wire feeding assist device will be described. The input side case 304 of the torque limiter has a covered cylindrical shape made of a nonmagnetic material, and a female screw is provided on the inner peripheral surface of the cylinder. A bearing 309 for rotating and supporting the output shaft 306 is accommodated in the inner center portion of the lid portion. The outer ring is fixed in the axial direction, and the inner ring is fixed to the output shaft 306 by a set screw 310. . Therefore, the axial movement of the output shaft 306 is restricted. Similarly to the input side case 304, the output side case 311 has a covered cylindrical shape made of a non-magnetic material. A male screw is provided on the outer peripheral surface of the cylinder and is screwed into the female screw of the input side casing 304. ing.

  Further, a disc-shaped hysteresis material 312 is fixed to the inner surface side of the lid portion of the output side case 311, and a bearing 313 is accommodated in the center portion, and the output shaft is paired with the bearing 309 of the input side case 304. 306 is rotatably supported. A disk-shaped multipolar permanent magnet plate 314 that is radially magnetized is fixed to the output shaft 306, and is opposed to the disk-shaped hysteresis material 312 fixed to the output side case 311 with a magnetic field gap in parallel. ing.

  In this conventional wire feeding assist device, the adjustment of the transmission torque, that is, the adjustment of the wire feeding force, is performed by adjusting the relative positions of the input side case 304 and the output side case 311 in the rotational direction. More specifically, the magnetic field between the hysteresis member 312 and the multipolar permanent magnet plate 314 facing the hysteresis member 312 is adjusted by adjusting the degree of screwing of the male screw of the output case 311 with respect to the female screw of the input casing 304. The transmission torque is adjusted by changing the gap.

JP 2003-39169 A

  When using a wire feed assist device, the feed force of the wire feed assist device, that is, the transmission torque of the torque limiter built in the wire feed assist device is appropriately adjusted according to the feed resistance of the wire feed path. There is a need to.

  However, in the conventional wire feeding assist device, the torque limiter is housed in the housing. Therefore, when checking and adjusting the wire feeding force, the housing cover is opened and the input side case 304 of the torque limiter is output. It is necessary to check the positional relationship with the side case 311 and to change the relative position in the rotation direction between the input side case 304 and the output side case 311, and there is a problem that it takes time to confirm and adjust. .

  In addition, if the cover is frequently opened for checking and adjusting the feeding force, there is a problem that dust or the like adheres to the torque limiter or the drive unit, thereby reducing the life of the apparatus.

  Furthermore, since the input side case 304 of the torque limiter is attached to the shaft 302 of the electric motor 301 via the joint 305, the entire torque limiter rotates while the electric motor 301 is driven, and the input of the torque limiter There is also a problem that the relative position in the rotation direction of the side case 304 and the output side case 311 cannot be changed, that is, the wire feeding force cannot be adjusted while the electric motor 301 is being driven.

  In order to solve the above problems, a torque limiter according to the present invention includes a housing, a first magnetic member provided in the housing, and a second magnetic member provided in the housing, A torque limiter capable of adjusting a transmission torque by adjusting a distance between a first magnetic member and the second magnetic member, wherein one part is located inside the casing and the other part is a part of the casing. It is located on the outside and can be linearly moved from the inside of the housing to the outside of the housing or from the outside of the housing to the inside of the housing. A moving member that changes the distance between the first magnetic member and the second magnetic member, and the moving member that is provided in a portion of the moving member that is located outside the casing and that moves the moving member A knob that moves together with the tab A memory unit having a plurality of graduations to indicate the position of the parts, but with the.

  In the torque limiter of the present invention, in addition to the above, the knob portion has a substantially U-shaped cross section in the longitudinal direction of the moving member, and the scale portion is provided between the housing and the knob portion. The tubular member is inserted through the moving member.

  In the torque limiter of the present invention, in addition to the above, the distal end portion of the moving member located in the casing has a tapered shape, and the moving member moves directly or indirectly with the distal end portion. The distance between the first magnetic member and the second magnetic member is changed by changing the contact state with the first magnetic member or the second magnetic member.

  The wire feeding assist device of the present invention includes a motor, one of the above torque limiters, a shaft connected to the torque limiter, and a wire feeding roller connected to the shaft. It is.

  With the above configuration, the magnetic field gap between the first magnetic member provided in the housing and the second magnetic member provided in the housing can be adjusted by a knob outside the housing. Since the magnetic field gap between the first magnetic member and the second magnetic member can be referred to by the position of the knob, it is possible to check and adjust the transmission torque of the torque limiter without opening the cover. The welding wire feeding force can be adjusted more easily than in comparison.

  In addition, since the feeding force of the welding wire feeder can be adjusted without opening the cover as in the case of conventional wire feeders, dust does not adhere to the torque limiter or the drive unit, and the device can be controlled by dust adhesion. It is possible to prevent a decrease in life.

  Moreover, since the magnetic field gap between the first magnetic member and the second magnetic member can be adjusted by a knob outside the housing even while the electric motor is being driven, the welding wire feeding force can be adjusted while driving the electric motor. It is not necessary to turn off the electric motor when adjusting the welding wire feed force, and the adjustment time can be shortened.

The figure which shows schematic structure of the wire feeding system using a wire feeding assistance apparatus. The front view which shows schematic structure of the wire feeding auxiliary | assistance apparatus of this Embodiment. Sectional drawing which shows schematic structure of the wire feeding auxiliary | assistance apparatus of this Embodiment (A) The figure which shows adjustment operation with the knob at the time of the lowest transmission torque in this embodiment (b) The figure which shows adjustment operation with the knob at the time of the highest transmission torque in this embodiment The figure which shows the state of the scale part attached to the cover The figure which shows the state of the scale part attached to the cover The figure which shows schematic structure of the conventional wire feeding auxiliary | assistance apparatus.

(Embodiment)
First, an outline of a wire feeding system using the wire feeding assistance device of the present embodiment will be described with reference to FIG.

  The welding wire 2 stored in the pail pack type wire storage box 1 passes through the wire feeding auxiliary device 3 and then is fed to the wire feeding path 4, the main wire feeding device 5, and the welding torch 6. At the time of welding, the wire feeding assisting device 3 feeds the welding wire 2 with a feeding force that matches the feeding resistance of the wire feeding path 4 in advance using a torque limiter described later, and feeds the main wire. The feeding load of the device 5 is reduced. Then, the wire feeding speed of the main wire feeding device 5 is controlled by a welding machine (not shown), and the welding wire 2 is fed to the welding location with high accuracy by the main wire feeding device 5.

  Here, the feeding force of the wire feeding assisting device 3 can give a constant feeding force to the welding wire 2 without depending on the wire feeding speed by the action of a torque limiter described later. Therefore, without disturbing the speed control of the main wire feeding device 5, the feeding load of the wire feeding path 4 is reduced and the speed control is facilitated. In this way, the welding wire 2 is fed at a constant torque by the wire feeding auxiliary device 3, and the welding wire is fed by the main wire feeding device 5 at a predetermined wire feeding speed.

  In the present embodiment, an example in which the wire feeding auxiliary device 3 is attached to the pail pack type wire storage box 1 is shown. However, the box for storing the wire is not limited to the pail pack type wire storage box 1 and is a reel type. The wire storage box may be used.

  Further, in the present embodiment, the case where the feeding force of the wire feeding auxiliary device 3 is matched with the feeding resistance of the wire feeding path 4 has been described. However, the feeding force is more than the feeding resistance of the wire feeding path 4. If the welding wire 2 does not buckle, the same effect can be obtained. On the other hand, even when the feeding force is set below the feeding resistance of the wire feeding path 4, the wire feeding assist The effect of reducing the feeding load of the main wire feeding device 5 can be obtained as compared with the case where the device 3 is not used.

  Furthermore, in the present embodiment, an example in which one wire feeding auxiliary device 3 is used has been described. However, a plurality of wire feeding auxiliary devices 3 may be used according to the length of the wire feeding path 4. . Further, the wire feeding auxiliary device 3 may be disposed on the side close to the welding torch 6, and the main wire feeding device 5 may be disposed on the side close to the pail pack type wire storage box 1.

  Next, the wire feeding assistance device 3 of the present embodiment will be described with reference to FIGS. 2 and 3.

  2 and 3 show a schematic configuration of the wire feeding assisting device 3 in the present embodiment, FIG. 2 is a front view, and FIG. 3 is a cross-sectional view taken along line AA in FIG.

  2 and 3, the electric motor 101 is fixed to the motor base 102 with a bolt (not shown). The motor base 102 is fixed to the housing 103 with bolts (not shown).

  A hysteresis plate 104 is attached to the output shaft of the electric motor 101, and a multipolar permanent magnet plate 105 is disposed at a position facing the hysteresis material 4 with a gap. A magnetic coupling type torque limiter that transmits a constant torque is configured by using hysteresis loss generated by the relative rotational movement of the hysteresis plate 104 and the multipolar permanent magnet plate 105.

  The multi-pole permanent magnet plate 105 is attached to the input gear 106 that is rotatably attached to the housing 103 via a bearing so as to be movable in the axial direction of the input gear 106. The key 107 press-fitted into the key groove of the input gear 106 is fitted into the key groove of the multipolar permanent magnet plate 105 so that the rotational torque of the multipolar permanent magnet plate 105 can be transmitted to the input gear 106. Yes.

  The input gear 106 constitutes a speed reduction mechanism together with the output gear 108, and is configured to amplify the rotational torque of the input gear 106 and transmit it to the output gear 108. The output gear 108 is attached to an output shaft 109 that is rotatably attached to the housing 103 via a bearing, and the key 110 press-fitted into the key groove of the output shaft 109 is fitted in the key groove of the output gear 108. Thus, the rotational torque of the output gear 108 is transmitted to the output shaft 109.

  A feed roller 111 is attached to the opposite side of the output shaft 109 where the output gear 108 is attached. The key 112 press-fitted into the key groove of the output shaft 109 is inserted into the key groove of the feed roller 111. The structure is such that the rotational torque of the output shaft 109 is transmitted to the feed roller 111.

  The pressure roller 113 is rotatably attached to the pressure arm 114 by a pin and a bearing (not shown). The welding wire 2 is sandwiched between the feeding roller 111 and the pressure roller 113 by the pressure applied by the pressure arm 114.

  Next, the feeding operation of the welding wire 2 will be described. The electric motor 101 is controlled to rotate at a constant rotational speed by a motor control device of a wire feeding assist device (not shown), and the hysteresis plate 104 attached to the output shaft of the electric motor 101 similarly rotates at a constant rotational speed. . The rotational movement of the hysteresis plate 104 transmits a constant torque to the multipolar permanent magnet plate 105 due to the hysteresis loss generated by the relative rotational movement with the multipolar permanent magnet plate 105. The transmission torque at this time is adjusted by adjusting the distance (magnetic field gap) between the hysteresis plate 104 and the multipolar permanent magnet plate 105 described later.

  The rotational torque transmitted to the multipolar permanent magnet plate 105 is amplified by a speed reduction mechanism constituted by the input gear 106 and the output gear 108 and transmitted to the output shaft 109 and the feed roller 111. The welding wire 2 is fed in the direction of the arrow 115 shown in FIG. 2 with a constant force by the rotational torque transmitted to the feeding roller 111.

  Next, a torque limiter composed of the hysteresis plate 104 and the multipolar permanent magnet plate 105 will be described with reference to FIGS.

  On the input gear 106 side of the multipolar permanent magnet plate 105, a flange-shaped passive portion 116 having an inclined portion is attached to the multipolar permanent magnet plate 105 via a passive portion bearing 117. The passive portion 116 has a structure that can move in the axial direction of the input shaft 106 together with the multipolar permanent magnet plate 105. The passive portion 116 also has a role as a case that encloses the multipolar permanent magnet plate 105. Here, the passive portion 116 is attached to the multipolar permanent magnet plate 105 via the passive portion bearing 117 because the passive portion 116 rotates even when the multipolar permanent magnet plate 105 is rotating. This is because the movement of the multipolar permanent magnet plate 105 in the axial direction of the input shaft 106 is restricted.

  As shown in FIG. 4, the passive unit 116 forms a straight cam via the moving unit slider 118 and the inclined unit 201, and converts the movement of the moving unit shaft 119 in the axial direction into the movement of the input shaft 106 in the axial direction. It has a structure.

  The moving part shaft 119 is fixed to the opposite end of the inclined part 201 of the moving part slider 118 so as to be rotatable with respect to the moving part slider 118, and restricts the movement of the moving part slider 118 in the axial direction of the moving part shaft 119. is doing. A screw part is provided in addition to the fixed part of the moving part shaft 119 to the moving part slider 118, and the moving part shaft 119 is formed by the screw part of the moving part shaft 119 and the screw part provided on the cover 120 fixed to the housing 103. Is restricted from moving in the axial direction. Then, by rotating a U-shaped knob portion 121 fixed to the side opposite to the moving slider 118 side of the moving portion shaft 119, the screw portion of the moving portion slider 118 and the screw portion of the cover 120 are engaged with each other. Changes, and the moving part shaft 119 can be moved in the axial direction (longitudinal direction).

  Further, a scale portion 122 with scales displayed at equal intervals in the axial direction of the moving portion shaft 119 is fixed to the cover 120. The movement amount of the moving part shaft 119 is visible to the operator by the position of the reference part 123 at the lower end of the knob part 121 that moves simultaneously with the moving part shaft 119 and the plurality of scales displayed on the scale part 122. It has a structure.

  The scale portion 122 only needs to be fixed to the cover 120, and may be a cylindrical member as shown in FIG. 5 through which the moving portion shaft 119 is inserted, or, as shown in FIG. 6, the moving portion shaft 119. It may be a plate-like member provided away from the plate.

  In the present embodiment, the shape of the knob portion 121 is a U-shape, and the reference portion 123 is provided at the lower end. However, the movement amount of the moving portion shaft 119 can be confirmed together with the scale portion 122. There is no problem with any shape or configuration.

  Next, the operation of the torque limiter composed of the hysteresis plate 104 and the multipolar permanent magnet plate 105 will be described.

  When the operator rotates the knob part 121, the moving part shaft 119 rotates simultaneously with the knob part 121. The moving portion shaft 119 moves in the axial direction according to the pitch of the screw portion and the rotational speed of the moving portion shaft 119 by the screw portion provided on the moving portion shaft 119 and the screw portion provided on the cover 120. . The movement of the moving part shaft 119 in the axial direction is caused by the rectilinear cam formed by the moving part slider 118 and the passive part 116, that is, the movement of the passive part 116 in the axial direction of the input gear 106, that is, the longitudinal direction of the moving part shaft 119. It is converted to a movement in the orthogonal direction. Then, the passive part bearing 117 and the multipolar permanent magnet plate 105 move in the axial direction of the input gear 106 together with the passive part 116, thereby changing the distance between the multipolar permanent magnet plate 105 and the hysteresis plate 104, that is, the magnetic field gap. be able to. In this way, the transmission torque can be changed.

  As described above, the magnetic field gap between the multipolar permanent magnet plate 105 and the hysteresis plate 104 can be adjusted by rotating the knob portion 121 outside the housing 103 of the wire feeding auxiliary device 3.

  4A shows a configuration in which the knob portion 121 is adjusted to a position where the magnetic field gap between the multipolar permanent magnet plate 105 and the hysteresis plate 104 is maximized, that is, the transmission torque is minimized. (B) shows a configuration in which the knob portion 121 is adjusted to a position where the magnetic field gap between the multipolar permanent magnet plate 105 and the hysteresis plate 104 is minimized, that is, the transmission torque is maximized.

  As shown in FIGS. 4A and 4B, a plurality of scales displayed on the scale part 122 fixed to the cover 120, and a reference part at the lower end of the knob part 121 that moves simultaneously with the moving part shaft 119 The distance between the multipolar permanent magnet plate 105 and the hysteresis plate 104 can be visually recognized by the position of 123. Therefore, if the transmission torque of the torque limiter configured by the hysteresis plate 104 and the multipolar permanent magnet plate 105 at each position of the reference portion 123 is measured in advance and the transmission torque is described in the scale portion 122, the reference portion 123 The torque transmitted by the torque limiter can be referred to by the position.

  At this time, since the passive part 116 is attached to the multipolar permanent magnet plate 105 via the passive part bearing 117, when the multipolar permanent magnet plate 105 is rotating, that is, the electric motor 101 is operated. Even when the passive unit 116 is present, the passive unit 116 does not rotate. Therefore, even when the electric motor 101 is in operation, the transmission torque of the hysteresis plate 104 and the multipolar permanent magnet plate 105 can be adjusted by the knob portion 121.

  With the above configuration, it is possible to check and adjust the torque transmitted by the torque limiter without opening the cover 120 by the knob portion 121 and the reference portion 123 outside the housing 103 of the wire feeding assisting device 3. The feeding force of the welding wire 2 can be easily adjusted as compared with the auxiliary device.

  In addition, since the feeding force of the wire feeding assisting device 3 can be confirmed and adjusted without opening the cover as in the conventional wire feeding assisting device, dust does not adhere to the torque limiter or the drive unit, It is possible to prevent the life of the apparatus from being reduced due to adhesion.

  Further, since the knob portion 121 outside the housing 103 can be adjusted even while the electric motor 101 is driven, the feeding force of the welding wire 2 can be adjusted while feeding the welding wire 2 while driving the electric motor 101. Adjustment is possible. Therefore, when adjusting the feeding force of the welding wire 2, it is not necessary to turn off the power source of the electric motor 101, and the adjustment time of the feeding force of the welding wire 2 can be shortened.

  And if the wire feeding system mentioned above is comprised using the wire feeding auxiliary | assistance apparatus 3 of the said structure, the feeding force of the wire feeding auxiliary | assistant apparatus 3 does not depend on wire feeding speed by the effect | action of a torque limiter. Since a constant feeding force can be applied to the welding wire, it works to help speed control without interfering with the speed control of the main wire feeding device 5, and when the wire feeding path 4 is long, Also, it is possible to improve the welding quality even in aluminum welding or the like in which the wire feedability greatly affects the welding quality.

  In the present embodiment, the torque limiter and the wire feeding assist device including the torque limiter have been described. However, the torque limiter includes at least a hysteresis plate 104, a multipolar permanent magnet plate 105, and a case including them. It is comprised from the passive part 116 which has the role of.

  The wire feeding auxiliary device of the present invention can reduce the feeding load of the main wire feeding device and improve the welding quality in the welding wire feeding system, and the main wire feeding device in the welding wire feeding system. It is industrially useful as a wire feeding auxiliary device used together.

DESCRIPTION OF SYMBOLS 1 Pail pack type wire storage box 2 Welding wire 3 Wire feeding auxiliary device 4 Wire feeding path 5 Main wire feeding device 6 Welding torch 101 Electric motor 102 Motor base 103 Housing 104 Hysteresis plate 105 Multipolar permanent magnet plate 106 Input Gear 107 Key 108 Output gear 109 Output shaft 110 Key 111 Feed roller 112 Key 113 Pressure roller 114 Pressure arm 115 Arrow 116 Passive part 117 Passive part bearing 118 Moving part slider 119 Moving part shaft 120 Cover 121 Knob part 122 Scale part 123 Reference part 201 Inclined part

Claims (4)

A housing, a first magnetic member provided in the housing, and a second magnetic member provided in the housing, and a distance between the first magnetic member and the second magnetic member A torque limiter that can adjust the transmission torque by adjusting
One part is located inside the case and the other part is located outside the case, and the case is directed from the inside of the case to the outside of the case or from the outside of the case. A moving member that is capable of linear movement in the direction of the inside, and that changes the distance between the first magnetic member and the second magnetic member by moving,
A knob portion that is provided on a portion of the moving member located outside the housing and moves together with the moving member for moving the moving member;
A scale portion having a plurality of scales for indicating the position of the knob portion;
Torque limiter with The knob portion has a substantially U-shaped cross-section in the longitudinal direction of the moving member, and the scale portion is provided between the housing and the knob portion, and has a cylindrical shape that passes through the moving member. The torque limiter according to claim 1, wherein the torque limiter is a member. The tip of the moving member located in the housing has a tapered shape, and the moving member moves to directly or indirectly contact the tip with the first magnetic member or the second magnetic member. The torque limiter according to claim 1 or 2, wherein a distance between the first magnetic member and the second magnetic member is changed by changing. A motor, a torque limiter according to any one of claims 1 to 3 connected to the motor, a shaft connected to the torque limiter, and a wire feed roller connected to the shaft. Wire feeding assist device.

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