JP5392750B2 - Welding wire feeder and welding apparatus - Google Patents

Description

  The present invention relates to an improved welding wire feeder for feeding welding wires used in consumable electrode gas shielded arc welding.

  In consumable electrode gas shielded arc welding, a welding wire feeder is used to stably feed a welding wire. (For example, refer patent document 1.) Conventionally, the apparatus shown in FIG. 6 was proposed as this welding wire feeder. FIG. 1 is an internal view of a conventional welding wire feeder 1. In the figure, a drive gear 2 is connected to a motor 7 attached to a welding wire feeder 1. The first feeding roll 3a is rotatably supported by the feeding apparatus main body 8. A first gear 4 a is coaxially attached to the first feed roll 3 a, and the first gear 4 a is engaged with the drive gear 2.

  The first pressure roll 5a is attached to the first pressure holder 12a. The base end portion of the first pressure holder 12a is rotatably supported by the feeding device body 8. In addition, the first lever portion 14a provided at the tip of the first pressure holder 12a is a first feeding roll by the spring force of a spring (not shown) attached to the first pressure holder 12a. It is pushed up in the direction away from 3a.

  For example, when the material of the welding wire 11 is hard like iron, it can be strongly pressed by the first pressure roll 5a. In that case, there is no slip between the first feed roll 3a and the first pressure roll 5a, so there is no need to provide a gear on the first pressure roll 5a. On the other hand, when the material of the welding wire 11 is soft like aluminum, it is necessary to lightly press with the 1st pressurization roll 5a. For this reason, since slip may occur between the first feeding roll 3a and the first pressure roll 5a, a gear (not shown) is coaxially attached to the first pressure roll 5a. The gear is meshed with the first gear 4a of the first feeding roll 3a.

  Further, the first feed roll 3a and the first pressure roll 5a are respectively formed with grooves for feeding the weld wire 11 while being pressed. Reference numeral 15 denotes a wire insertion opening, reference numeral 16 denotes a wire delivery port, and the center guide 10 is provided to guide the welding wire 11.

  Next, FIG. 7 is an exploded view of the first pressure handle 17a of the conventional welding wire feeder 1, and FIG. 8 is a cross-sectional view of the first pressure handle 17a of the conventional welding wire feeder 1. FIG. 6 and 7, the first handle shaft portion 19a is attached to the first handle body 18a of the first pressure handle 17a. The distal end portion (X1 direction in the drawing) of the first handle shaft portion 19a is supported on the first support member 22a attached to the feeder main body 8 so as to be tiltable by the first fixing pin 21a. . Further, the base end portion (X2 direction in the drawing) of the first handle shaft portion 19a can be hooked on the first lever portion 14a of the first pressure holder 12a. A first pressure spring 20a is provided in the first handle body 18a, and the first feeding roll 3a is pressurized by the first pressure roll 5a.

  Further, by manually rotating the first knob portion 23a attached to the first handle body 18a, the spring force of the first pressure spring 20a is changed, and the first pressure roll 5a The applied pressure can be adjusted. An appropriate set value is determined by the material and diameter of the welding wire 11 for the pressing force of the first pressure roll 5a, and is set with reference to the setting scale displayed on the first handle body 18a.

  FIG. 6 shows a state in which the second pressure handle 17b is tilted downward, and the first pressure handle 17a shows a state of being hooked on the first lever portion 14a of the first pressure holder 12a. ing. The second feed roll 3b, the second gear 4b, the second pressure roll 5b, the second pressure holder 12b, the second lever portion 14b, the second pressure handle 17b, the second The handle main body 18b, the second handle shaft portion 19b, the second pressure spring 20b, the second fixing pin 21b, the second support member 22b, and the second knob portion 23b are connected to the first feeding roll 3a, First gear 4a, first pressure roll 5a, first pressure holder 12a, first lever portion 14a, first pressure handle 17a, first handle body 18a, first handle shaft portion 19a, the first pressure spring 20a, the first fixing pin 21a, the first support member 22a, and the first knob portion 23a have the same functions, and thus the description thereof is omitted. In the following description of the operation, the same is omitted.

  The operation will be described below. 6 to 8, first, when the first pressure handle 17a is tilted toward the front of the drawing, the base end portion of the first handle shaft portion 19a of the first pressure handle 17a (X2 direction in the drawing). And the first lever portion 14a of the first pressure holder 12a are disengaged. Then, by the spring force of a spring (not shown) attached to the first pressure holder 12a, the first pressure holder 12a is rotated upward with the base end as a fulcrum, and as a result, The first pressure roll 5a integrated with the first pressure holder 12a is also lifted in the same manner.

  Then, the welding wire 11 from the wire reel (not shown) is inserted through the wire insertion port 15, passed through the groove of the second feed roll 3 b, passed through the center guide 10, and the groove of the first feed roll 3 a. And through the wire outlet 16. After this, a conduit cable (not shown) that guides the welding wire 11 is inserted through a welding torch (not shown).

  Next, the first lever portion 14a is rotated downward with each proximal end portion of the first pressure holder 12a as a fulcrum. Then, the first pressure handle 17a is rotated upward with the tip end portion (X1 direction in the drawing) of the first handle shaft portion 19a as a fulcrum, so that the first lever portion 14a of the first pressure holder 12a. To fix the first pressure holder 12a. As a result, the welding wire 11 is sandwiched between the groove of the first feed roll 3a and the groove of the first pressure roll 5a.

  When the motor 7 is driven, the drive gear 2 connected to the motor 7 is rotated, and the first feeding roll 3a meshed with the drive gear 2 is rotated. As a result, the welding wire 11 sandwiched between the first feeding roll 3a and the first pressure roll 5a is fed.

JP-A-6-71444

  As described above, the conventional welding wire feeder 1 changes the spring force of the first pressure spring 20a by manually rotating the first knob portion 23a of the first pressure handle 17a. Thus, the pressing force of the first pressure roll 5b was adjusted. Therefore, whenever it is necessary to change the applied pressure of the first pressure roll 5a every time the material or diameter of the welding wire 11 is changed, the first knob portion 23a is manually rotated. As a result, it took a lot of work.

  In addition, a conduit cable is connected to the welding wire feeder 1, and a welding torch is attached to the tip portion thereof. And the welding wire 11 is penetrated in a conduit cable, is electrically fed by the electric power feeding tip attached to the front-end | tip part of a welding torch, and is supplied to a molten pool. For this reason, if the conduit cable is bent during welding, the feeding resistance of the welding wire 11 at that point increases, and the first pressure roll 5a slips to stabilize the welding wire 11. In some cases, it was not possible to send them.

  Further, even when dust on the welding wire 11 accumulates in the insertion hole of the power feed tip or the tip of the power feed tip is burned out by arc heat, the welding wire 11 cannot be stably fed. In these cases, it is necessary to increase the pressing force of the first pressure roll 5a, but the pressing force cannot be adjusted manually during welding.

  An object of this invention is to provide the welding wire feeder and welding apparatus which can adjust the pressurizing force of the pressure roll of a welding wire feeder to the optimal pressurizing force.

The first invention is
A motor,
A feeding roll driven by the motor;
A pressure roll that feeds a welding wire with the feed roll; and
A pressure holder to which the pressure roll is attached;
A welding wire feeder having a pressure handle that pressurizes the pressure holder and pressurizes the pressure roll onto the feed roll;
In a welding apparatus equipped with a welding power source,
A pressurizing spring for pressurizing the pressurizing holder by the pressurizing handle of the welding wire feeder;
A pressure adjusting drive for adjusting the length of the pressure spring;
The welding power source is a welding wire setting device for setting the material and diameter of the welding wire;
A database in which the material and diameter of the welding wire and the applied pressure corresponding thereto are stored;
The set value output from the welding wire setter is input, and a pressure spring length reference command value corresponding to the pressurizing force selected from the database based on the set value is output to the pressurizing force adjusting drive. A welding apparatus comprising a pressure spring length commander.

The second invention is
An armature current setting device in which an armature current reference value of the motor corresponding to welding conditions is preset;
An armature current detector for detecting an armature current of the motor;
An armature current error calculator for calculating an armature current error value by inputting the armature current reference value and the armature current detection value output from the armature current detector;
The pressure spring length reference command value and the armature current error value are input, and the pressure spring length correction command value obtained by increasing the pressure spring length reference command value corresponding to the armature current error value is A pressure spring length correction commanding device that outputs to a pressure adjusting drive;
The welding apparatus according to claim 1, further comprising:

  According to the welding wire feeder and the welding apparatus of the present invention, the pressure adjusting drive provided in the pressurizing handle can automatically adjust the length of the pressurizing spring based on an external command value. Therefore, the pressing force of the pressure roll of the welding wire feeder can be adjusted to an optimum pressing force.

[Embodiment 1]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the invention will be described based on examples with reference to the drawings. FIG. 1 is a diagram showing a welding wire feeder 31 according to Embodiment 1 of the present invention, showing in detail a pressure handle different from the prior art, and other functions of the conventional welding wire shown in FIG. Since the function is the same as that of the feeder 1, the description thereof is omitted.

  In FIG. 1, a first handle shaft portion 34a is attached to a first handle body 33a of a first pressure handle 32a. The tip end portion (X1 direction in the drawing) of the first handle shaft portion 34a is supported on the first support member 22a attached to the feeder main body 8 so as to be tiltable by the first fixing pin 21a. Further, the base end portion (X2 direction in the drawing) of the first handle shaft portion 34a can be hooked on the first lever portion 14a of the first pressure holder 12a.

  The first handle main body 33a is attached with a first pressurizing force adjusting drive 35a and fixed with a first fixing nut 36a. A distal end portion (X1 direction in the drawing) of the first pressure spring 37a is provided in the first handle body 33a, and a proximal end portion (X2 direction in the drawing) of the first pressure spring 37a is the first. The pressure adjusting drive 35a is provided. That is, the first pressurizing spring 37a is pressed by the first handle body 33a and the first pressurizing force adjusting drive 35a. For this purpose, the first pressurizing roll 5a is used to The feed roll 3a is pressurized. The first pressure adjusting driver 35a operates in a pneumatic or hydraulic manner, and when a pressure spring length command value to be described later is input, the length of the first pressure spring 37a is set to this command value. Change to length.

  The second pressure handle 32b, the second handle body 33b, the second handle shaft 34b, the second pressure adjusting drive 35b, the second fixing nut 36b, and the second pressure spring 37b. The first pressure handle 32a, the first handle body 33a, the first handle shaft portion 34a, the first pressure adjusting drive 35a, the first fixing nut 36a, and the first pressure spring 37a. Since this is the same function as, the description is omitted. The same is omitted in the following.

  FIG. 2 is a diagram for explaining the operation of the pressurizing force adjusting drive of the welding wire feeder according to the first embodiment of the present invention. FIG. 6A shows a state in which the first pressurizing spring 37a is extended to the maximum before the first pressurizing force adjusting drive 35a operates. From this state, when a pressure spring length command value, which will be described later, is input to the first pressurizing force adjusting drive 35a, the first pressurizing force adjusting drive 35a, as shown in FIG. In operation, the first pressure spring 37a is pushed downward (X2 direction in the drawing) to change the length of the first pressure spring 37a to the length of the pressure spring length command value. As a result, the spring force of the first pressure spring 37a increases.

  FIG. 3 is a block diagram illustrating a control circuit of the welding wire feeder according to the first embodiment of the present invention. In the figure, a control circuit 40 of the welding wire feeder 31 is provided in a welding power source (not shown), and a welding wire setting device 41 provided in the control circuit 40 is used to control the welding wire 11. Material and diameter are set. The database 42 stores the material and diameter of the welding wire 11 and the applied pressure of the first pressure roll 5a corresponding thereto. The pressure spring length command device 43 receives the set value S1 of the material and diameter of the welding wire 11 output from the welding wire setter 41, and sets the set value S2 of the applied pressure from the database 42 based on the set value S1. And a pressure spring length reference command value S3 for setting the length of the first pressure spring 37a so as to be the set value S2 is output to the first pressurizing force adjusting drive 35a.

  The operation will be described below. An operator sets the material and diameter of the welding wire in the welding wire setting device 41 of the control circuit 40 of the welding wire feeder 31 provided in the welding power source (not shown). The pressurizing spring length command device 43 receives the setting value S1 of the material and diameter of the welding wire output from the welding wire setting device 41, and uses the setting value S2 of the pressurizing force from the database 42 based on the setting value S1. Then, a pressure spring length reference command value S3 for setting the length of the first pressure spring 37a so as to be the set value S2 is output to the first pressurizing force adjusting drive 35a. Then, the first pressurizing force adjusting machine 35a is configured so that the pressurizing force of the first pressurizing roll 5a is equal to the pressurizing force corresponding to the material and the diameter of the welding wire 11 and the first pressurizing spring 37a. Change the length.

  As a result, when the material and the diameter of the welding wire 11 are changed, the first knob portion 23b of the first pressurizing handle 17a is manually rotated each time as in the prior art, so that the first There is no need to change the pressing force of the pressure roll 5b, and the operator simply sets the material and diameter of the welding wire 11 in the control circuit 40 of the welding wire feeder 31. Since the pressure is automatically set, work man-hours can be greatly reduced.

[Embodiment 2]
FIG. 4 is a block diagram showing a control circuit 45 of the welding wire feeder according to the second embodiment of the present invention. Since only the functions different from the control circuit 40 of the welding wire feeder of the first embodiment of the present invention described above will be described, and other functions are the same functions as the welding wire feeder of the first embodiment of the present invention. The description is omitted.

  In the figure, a control circuit 45 of a welding wire feeder 44 is provided in a welding power source (not shown), and an armature current setting device 46 provided in the control circuit 45 is used to set welding conditions. The armature current of the corresponding motor 47 is set in advance. An armature current detector 48 is provided in the motor 47, and the armature current detector 48 detects the armature current of the motor 47. The armature current error calculator 49 receives the armature current detection value S4 output from the armature current detector 48 and the armature current reference value S5 set in the armature current setter 46, and receives the armature current error value S4. A current error value S6 is calculated. The pressure spring length correction command device 50 inputs the pressure spring length reference command value S3 and the armature current error value S6 output from the pressure spring length command device 43, and responds to this armature current error value. Then, the pressure spring length correction command value S7 obtained by increasing the pressure spring length reference command value is output to the pressure adjusting drive unit 35a. That is, when the armature current detection value S4 increases from the armature current reference value S5, the pressurizing spring length correction command value S7 for shortening the length of the first pressurizing spring 37a is applied to the pressurizing force adjusting drive. To 35a.

  Hereinafter, the operation will be described with reference to FIG. FIG. 5 is a diagram showing temporal changes in the armature current detection value S4 and the pressure spring length correction command value S7 according to the second embodiment of the present invention. Before starting the welding operation, the armature current setting device 46 provided in the control circuit 45 of the welding wire feeder 44 provided in the welding power source (not shown) is used for the motor 47 corresponding to the welding conditions. A reference value for the armature current is set in advance. Then, at time t1 shown in FIG. 5, inching work or welding in which the welding wire is protruded from the tip end portion of the torch is started, and normal welding wire is fed. At this time, an armature current detector 48 detects the armature current of the motor 47 proportional to the welding wire feeding load.

  At time t2 shown in FIG. 5, the conduit cable (not shown) connected to the welding wire feeder 44 is bent, or dust of the welding wire 11 is accumulated in the insertion hole of the power feed tip (not shown). Or when the front-end | tip part of an electric power feeding tip burns out by arc heat, the feeding resistance of the welding wire 11 in the location increases. Thus, when the feeding load of the welding wire 11 increases, the armature current detection value S4 of the motor 47 increases as shown in FIG. At this time, the armature current error calculator 49 receives the armature current detection value S4 output from the armature current detector 48 and the armature current reference value S5 set in the armature current setter 46. The armature current error value S6 is calculated.

  Then, as shown in FIG. 5B, the pressure spring length correction commanding device 50 calculates the pressure spring length reference command value S3 and the armature current error value S6 output from the pressure spring length commanding device 43. The pressure spring length correction command value S7 obtained by inputting and increasing the pressure spring length reference command value S3 corresponding to the armature current error value is output to the pressurizing force adjusting drive 35a. The first pressurizing force adjusting drive 35a shortens the length of the first pressurizing spring 37a and increases the pressurizing force of the first pressurizing roll 5a.

  When the feeding load of the welding wire 11 decreases at time t3 shown in FIG. 5 and the welding wire feeding returns to a normal state, the armature current detection of the motor 47 is detected as shown in FIG. The value S4 decreases and approaches the armature current reference value S5. At this time, by the operation opposite to the above-described operation, the pressurization spring length correction command value S7 decreases and approaches the pressurization spring length reference command value S3 as shown in FIG.

  As a result, during the inching operation or during welding, when the feeding resistance of the welding wire 11 increases from the normal feeding state, the pressing force of the first pressure roll 5a is automatically increased, and the welding is performed. When the feeding resistance of the wire 11 returns to a normal feeding state, the pressing force of the first pressure roll 5a can be automatically reduced to an appropriate pressing force. Therefore, when the feeding resistance of the welding wire 11 is increased from the normal feeding state, the first pressure roll 5a can be prevented from slipping, and the welding wire 11 can be fed stably.

  Although the pneumatic or hydraulic mechanism has been described as the two pressurizing force adjusting drives 35a and 35b of the welding wire feeder of the present invention, the welding wire feeder of the present invention is not limited to these. The length of the pressurizing spring may be set by attaching a direct acting linear guide instead of the pressurizing force adjusting drive.

  Further, instead of detecting the armature current by the armature current detector 48 of the welding wire feeder of the present invention, a rotary encoder is attached to the motor, the rotational speed of the motor is detected, and the welding wire feeding load is detected. You may judge the change.

  Further, upper limit values are set for the pressure spring length reference command value S3 output from the pressure spring length command device 43 and the pressure spring length correction command value S7 output from the pressure spring length correction command device 50. Thus, when this upper limit value is exceeded, it may be determined that the welding wire is fed abnormally, and a function of displaying a warning or stopping may be provided.

  Moreover, although the welding wire feeder of this invention mentioned above demonstrated what provided the two feed rolls 3a and 3b and the two pressurization rolls 5a and 5b, this invention is one feed roll. And a welding wire feeder provided with one pressure roll.

  In the above-described welding wire feeder of the present invention, the drive gear 2 is connected to the motor, and the gears 4a and 4b of the two feed rolls 3a and 3b are respectively engaged with the drive gear 2. Explained. Instead of this, the welding wire feeder of the present invention can also be applied to a case where a reduction gear is attached to a motor and the motor is directly connected to one feeding roll. In this case, the drive gear 2 can be omitted.

It is a figure which shows the welding wire feeder of Embodiment 1 of this invention. It is a figure for demonstrating operation | movement of the driving machine for pressurization adjustment of the welding wire feeder of Embodiment 1 of this invention. It is a block diagram which shows the control circuit of the welding wire feeder of Embodiment 1 of this invention. It is a block diagram which shows the control circuit of the welding wire feeder of Embodiment 2 of this invention. It is a figure which shows the time change of the armature current detection value and pressurization spring length correction command value of Embodiment 2 of this invention. It is an internal view of the conventional welding wire feeder. It is an exploded view of the pressurization handle of the conventional welding wire feeder. It is sectional drawing of the pressurization handle of the conventional welding wire feeder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Welding wire feeder 2 Drive gear 3a 1st feed roll 3b 2nd feed roll 4a 1st gear 4b 2nd gear 5a 1st pressure roll 5b 2nd pressure roll 7 Motor 8 Feeder body 10 Center guide 11 Welding wire 12a First pressure holder 12b Second pressure holder 14a First lever portion 14b Second lever portion 15 Wire insertion port 16 Wire feed port 17a First pressure Handle 17b Second pressure handle 18a First handle body 18b Second handle body 19a First handle shaft portion 19b Second handle shaft portion 20a First pressure spring 20b Second pressure spring 21a Second 1 fixed pin 21a 1st fixed pin 22b 2nd support member 22b 2nd support member 23a 1st knob part 23b 2nd knob part 31 Welding wire feeder 32a 1st 1 pressure handle 32b 2nd pressure handle 33a 1st handle body 33b 2nd handle body 34a 1st handle shaft part 34b 2nd handle shaft part 35a 1st pressure adjusting drive 35b 2 pressure adjusting drive 36a first fixed nut 36b second fixed nut 37a first pressure spring 37b second pressure spring 40 control circuit 41 welding wire setting device 42 database 43 pressure spring length command 44 Welding wire feeder 45 Control circuit 46 Armature current setting device 47 Motor 48 Armature current detector 49 Armature current error calculator 50 Pressure spring length correction command S1 Setting value S2 of welding wire material and diameter Pressure setting value S3 Pressure spring length reference command value S4 Armature current detection value S5 Armature current reference value S6 Armature current error value S7 Pressure spring length correction command value

Claims (2)

A motor,
A feeding roll driven by the motor;
A pressure roll that feeds a welding wire with the feed roll; and
A pressure holder to which the pressure roll is attached;
A welding wire feeder having a pressure handle that pressurizes the pressure holder and pressurizes the pressure roll onto the feed roll;
In a welding apparatus equipped with a welding power source,
A pressurizing spring for pressurizing the pressurizing holder by the pressurizing handle of the welding wire feeder;
A pressure adjusting drive for adjusting the length of the pressure spring;
The welding power source is a welding wire setting device for setting the material and diameter of the welding wire;
A database in which the material and diameter of the welding wire and the applied pressure corresponding thereto are stored;
The set value output from the welding wire setter is input, and a pressure spring length reference command value corresponding to the pressurizing force selected from the database based on the set value is output to the pressurizing force adjusting drive. A welding apparatus comprising a pressure spring length commander. An armature current setting device in which an armature current reference value of the motor corresponding to welding conditions is preset;
An armature current detector for detecting an armature current of the motor;
An armature current error calculator for calculating an armature current error value by inputting the armature current reference value and the armature current detection value output from the armature current detector;
The pressure spring length reference command value and the armature current error value are input, and the pressure spring length correction command value obtained by increasing the pressure spring length reference command value corresponding to the armature current error value is A pressure spring length correction commanding device that outputs to a pressure adjusting drive;
The welding apparatus according to claim 1, further comprising:

Images