CN110270740A - Welding wire feeding system and welding system - Google Patents

Welding wire feeding system and welding system Download PDF

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Publication number
CN110270740A
CN110270740A CN201811579379.0A CN201811579379A CN110270740A CN 110270740 A CN110270740 A CN 110270740A CN 201811579379 A CN201811579379 A CN 201811579379A CN 110270740 A CN110270740 A CN 110270740A
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China
Prior art keywords
welding wire
feeding
welding
feeding portion
control unit
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CN201811579379.0A
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CN110270740B (en
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宫部浩一
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Daihen Corp
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Daihen Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/12—Automatic feeding or moving of electrodes or work for spot or seam welding or cutting
    • B23K9/133—Means for feeding electrodes, e.g. drums, rolls, motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/32—Accessories

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Arc Welding Control (AREA)

Abstract

The present invention provide not add new testing agency can detect welding wire arrival welding wire feeding system and have the welding system of the welding wire feeding system.In the welding wire feeding system of welding system (A1), have: feeding portion (21) are fed welding wire (B)；Feeding portion (31), it is configured in the direction of feed side for more depending on welding wire (B) than feeding portion (21), and there are feed motor (311), pass through the swivel feeding welding wire (B) of the feed motor (311)；With control unit (11,22,32), control feeding portion (21) and feeding portion (31).Control unit (32) has: current sensor (322), and detection provides the electric current for arriving feed motor (311)；With arrival test section (323), the current detection value (I detected based on current sensor (322)1) come detect welding wire (B) reach feeding portion (31).

Description

Welding wire feeding system and welding system
Technical field
The present invention relates to feed the welding wire feeding system of welding wire and have the welding system of the welding wire feeding system.
Background technique
The welding wire of feeding is being used as electrode come in the welding system of the consumable-electrode type welded, by by welding wire into It is connected to device with the welding torch cable of welding torch strip, to expand weld job range.If but due to by welding torch cable strip, The feeding resistance of welding wire just will increase, therefore welding wire is no longer smoothly fed.In this case, occur electric arc become it is unstable this The problem of sample.As a solution to the problem, the additional structure for feeding welding wire near the front end of welding wire fed path, leads to Structure traction welding wire is crossed to apply tension, thus makes the feeding drag reduction of welding wire.The feed system of such welding wire is claimed Recommend feed system.
In addition, in the welding system of consumable-electrode type, operating personnel when replacing welding wire, carry out by welding wire from welding wire into The crawl operation of the front end of welding torch is sent to device.Operating personnel is due to cannot confirm welding wire feeding to feeding path halfway Where, therefore be, releasing inching button prominent from the front end of welding torch in the front end for seeing welding wire.The case where recommending feed system Under, due to the feed path path length of welding wire, operating personnel needs (such as tens of seconds are to several points) Continued depression crawl for a long time Button.In addition, welding wire can excessively be stretched out from the front end of welding torch, and operating personnel also needs if releasing the evening on opportunity of inching button Extra welding wire pliers etc. is cut off.
In order to eliminate the burden of these operating personnels, proposition detects the arrival of welding wire to make it be automatically stopped method.Example Such as Patent Document 1 discloses the methods of the ignition tip of the front end of electro-detection welding wire contact welding torch.In addition, in patent document 2 Disclose the method for the arrival with non-contact sensor detection welding wire.
Existing technical literature
Patent document
Patent document 1:JP Beneficial 5-13669 bulletin
Patent document 2:JP special open 2017-24043 bulletin
But in the case where these methods, need to add new testing agency to detect the arrival of welding wire.Due to chasing after Added new testing agency and welding torch or welding supply structure is complicated changes, in addition, manufacturing cost increases.In addition, also examining Consider the amount of feeding that welding wire is calculated according to the rotation number of feed motor, and the feed-disabling when it becomes the given amount of feeding Method.But in misspecification due to the length of welding torch cable and in the case where the different given amount of feeding, or before welding wire In the case where the calculating of the state beginning amount of feeding for entering the midway fed path, welding wire can largely be emitted from the front end of welding torch Out.Therefore, in the case where this method, the additional testing agency for preventing this from emerging is needed.In order to detect in crawl operation The arrival of welding wire and need new testing agency this in the system other than welding system also become problem.Such as in thermal spraying In the case where spraying coating line is fed to thermal spraying gun in system, feeding cored solder wire in soldering system (brazing system) In the case of, it also will appear same problem.
Summary of the invention
The present invention is proposed in view of above-mentioned thing, it is therefore intended that, welding wire can be detected not adding new testing agency The welding wire feeding system of arrival and the welding system for having the welding wire feeding system.
In order to solve the above problems, following technological means is proposed in the present invention.
It is have by the welding wire feeding system features that the 1st side of the invention provides: the 1st feeding portion, feeding weldering Silk；2nd feeding portion, configuration have feed motor in the direction of feed side for more leaning on the welding wire than the 1st feeding portion, Welding wire described in swivel feeding by the feed motor；And control unit, control the 1st feeding portion and the described 2nd into To portion, the control unit has: sensor, and detection provides the electric signal or the feed motor for arriving the feed motor Rotation speed；With arrival test section, detected based on the detected value that the sensor detects described in the welding wire arrival 2nd feeding portion.According to this structure, welding wire is fed by the 1st feeding portion first, by the 1st feeding portion after welding wire reaches the 2nd feeding portion And the 2nd feeding portion feeding.The feed motor in the 2nd feeding portion is all non-loaded shape until welding wire reaches the 2nd feeding portion State, but load is born after welding wire reaches the 2nd feeding portion.Therefore, before and after welding wire reaches the 2nd feeding portion, it is output to feeding The change in electric of motor.The detected value that test section is detected based on sensor is reached, from the electricity for being output to feed motor The variation detection welding wire of signal reaches the 2nd feeding portion.In welding wire feeding system, has detection in order to detect exception and be output to The sensor of the electric signal of feed motor.Due to the arrival with sensor detection welding wire, do not need to add new inspection Survey mechanism.
In addition, including electric current, electric power, voltage etc. in " electric signal ".In addition, " detection provides the electricity for arriving feed motor The sensor of signal " is not limited to the sensor in the connecting line of connection driving circuit and feed motor detection electric signal, example As also comprising by providing the electricity for arriving feed motor in the connecting line detection electric signal of connection driving circuit and power supply to detect The sensor of signal.
Be have by the welding wire feeding system features that the 2nd side of the invention provides: the 1st feeding portion has feeding Motor passes through the swivel feeding welding wire of the feed motor；2nd feeding portion, configuration are more leaning on institute than the 1st feeding portion The direction of feed side for stating welding wire, feeds the welding wire；And control unit, control the 1st feeding portion and the 2nd feeding Portion, the control unit have: sensor, and detection provides the electric signal for arriving the feed motor；With arrival test section, base The 2nd feeding portion is reached in the detected value that the sensor detects to detect the welding wire.According to this structure, welding wire is first It is fed by the 1st feeding portion, is fed after welding wire reaches the 2nd feeding portion by the 1st feeding portion and the 2nd feeding portion.1st feeding portion Feed motor all bears big load until welding wire reaches the 2nd feeding portion, but reaches the 2nd feeding portion back loading in welding wire Mitigate.Therefore, before and after welding wire reaches the 2nd feeding portion, it is output to the change in electric of feed motor.Reach test section base In the detected value that sensor detects, the 2nd feeding portion is reached from the variation for the electric signal for being output to feed motor detection welding wire. In welding wire feeding system, has the sensor that detection is output to the electric signal of feed motor in order to detect exception.Due to Using the arrival of sensor detection welding wire, therefore do not need to add new testing agency.
In the preferred embodiments of the present invention, the arrival test section has: comparing section, by the detected value with Threshold value is compared, described to reach test section the comparison result in portion detects the arrival of the welding wire based on the comparison.Root According to the structure, the arrival of welding wire can be detected when detected value is more than threshold value.
In the preferred embodiments of the present invention, the arrival test section has: calculation section, calculates the detected value Differential value；And comparing section, the differential value is compared with threshold value, the arrival test section is based on the comparison in portion Comparison result detect the arrival of the welding wire.According to this structure, weldering can be detected based on the variation of the increment rate of detected value The arrival of silk.
In the preferred embodiments of the present invention, the finger for reaching test section and corresponding to the feed speed of the welding wire Value is enabled to make the changes of threshold.According to this structure, even if allowing the non-loaded of feed motor in the feed speed due to welding wire In the case where detected value variation when state, it can also inhibit the error detection of the arrival of welding wire.
In the preferred embodiments of the present invention, the electric signal is electric current.It according to this structure, can be based on the change of electric current Change to detect the arrival of welding wire.
In the preferred embodiments of the present invention, the control unit detects the welding wire in the arrival test section When arrival, stop the 1st feeding portion and the 2nd feeding portion.According to this structure, the feeding of welding wire can be made to reach the It is automatically stopped at 2 feeding portions.
In the preferred embodiments of the present invention, the control unit detects the welding wire in the arrival test section When arrival, reduce the feed speed of the welding wire in the 1st feeding portion and the 2nd feeding portion, in feed speed When feeding the time by given low velocity after reduction, stop the 1st feeding portion and the 2nd feeding portion.According to this Structure can make the feeding of welding wire behind the 2nd feeding portion of arrival, be automatically stopped at by the low velocity feeding time.As long as suitable Ground sets low velocity and feeds the time, and welding wire can be made to stop behind the front end for being fed into welding torch.
In the preferred embodiments of the present invention, it is also equipped with notification unit, is detected in the arrival test section described The arrival of the welding wire is reported when the arrival of welding wire.It according to this structure, can be by the arrival notice of welding wire to operating personnel.
In the preferred embodiments of the present invention, the control unit is also equipped with: speed detecting portion, detection the described 1st The feed speed of the welding wire in feeding portion；Amount of feeding calculation section passes through the feeding speed detected to the speed detecting portion Degree is integrated to calculate the amount of feeding from feeding of the welding wire；And abnormity detection portion, even if in the feeding The amount of feeding that amount calculation section calculates becomes the 1st given value the above and reaches the arrival that the welding wire is also not detected in test section In the case of, it is detected as exception.According to this structure, the exception in press-bending, the 1st feeding portion of welding wire etc. can be detected.
In the preferred embodiments of the present invention, the control unit is also equipped with: speed detecting portion, detection the described 1st The feed speed of the welding wire in feeding portion；Amount of feeding calculation section, by speed that the speed detecting portion is detected into Row integrates to calculate the amount of feeding from feeding of the welding wire；And abnormity detection portion, it is calculated in the amount of feeding calculation section The amount of feeding out is described when being the 2nd given value or less to be reached in the case that test section detects the arrival of the welding wire, is detected as It is abnormal.According to this structure, the exception in the 2nd feeding portion etc. can be detected.
It is characterized in that having by the welding system that the 2nd side of the invention provides: welding torch；Electric power is provided to the welding torch Welding supply；With the welding wire feeding system provided by the 1st side of the invention to welding torch feeding welding wire.
In the preferred embodiments of the present invention, the 2nd feeding portion is configured at the welding torch.According to this structure, energy The position that will test the arrival of welding wire is set as the position closer to the front end of welding torch.
The effect of invention
According to the present invention, welding wire first by the 1st feeding portion feed, welding wire reach the 2nd feeding portion after by the 1st feeding portion with And the 2nd feeding portion feeding.The feed motor in the 2nd feeding portion is all no-load condition until welding wire reaches the 2nd feeding portion, But load is born after welding wire reaches the 2nd feeding portion.Therefore, before and after welding wire reaches the 2nd feeding portion, it is electronic to be output to feeding The change in electric of machine.The detected value that test section is detected based on sensor is reached, from the electric signal for being output to feed motor Variation detection welding wire reach the 2nd feeding portion.In welding wire feeding system, has detection in order to detect exception and be output to feeding The sensor of the electric signal of motor.Due to the arrival with sensor detection welding wire, do not need to add new detection machine Structure.
Other features and advantage of the invention, in the detailed description of following progress, can be become brighter by reference to attached drawing Really.
Detailed description of the invention
Fig. 1 is the integrally-built synoptic diagram for indicating welding system involved in the 1st embodiment.
Fig. 2 is the block diagram for indicating the functional structure of welding system shown in FIG. 1.
Fig. 3 is the self-braking timing diagram for illustrating the feeding of welding wire.
Fig. 4 is the flow chart for illustrating the processing of the crawl in welding system involved in the 1st embodiment, and (a) is indicated The point operation control processing that the control unit of welding supply is carried out (b) indicates the arrival detection that the control unit of welding torch is carried out Processing.
Fig. 5 is the flow chart for illustrating the processing of the crawl in variation.
Fig. 6 is the self-braking timing diagram for illustrating the feeding of the welding wire in variation.
Fig. 7 is the block diagram for indicating the functional structure of welding system involved in the 2nd embodiment.
Fig. 8 is the block diagram for indicating the functional structure of welding system involved in the 3rd embodiment.
Fig. 9 is the self-braking timing diagram for illustrating the feeding of the welding wire in the 3rd embodiment.
Figure 10 is the integrally-built synoptic diagram for indicating welding system involved in the 4th embodiment.
Figure 11 is the block diagram for indicating the functional structure of welding system shown in Fig. 10.
The explanation of appended drawing reference
A1, A2, A3, A4 welding system
1 welding supply
11 control units
111 abnormity detection portions
2 wire feed units
21 feeding portions
211 feed motors
212 feed rolls
213 pressure rollers
22 control units
221 driving portions
222 speed detecting portions
223 amount of feeding calculation sections
224 current sensors
225 reach test section
23 welding wire reels
3,3 ' welding torch
31 feeding portions
311 feed motors
312 feed rolls
313 pressure rollers
32 control units
321 driving portions
322 current sensors
323 reach test section
33 operation portions
34 display units
9 drawing-type wire-feed motors
91 feeding portions
911 feed motors
912 feed rolls
913 pressure rollers
92 control units
921 driving portions
922 current sensors
923 reach test section
39,39 ' welding torch cable
41,42 power supply line
5 power transmission lines
6 gas tanks
7 gas pipes
8 communication lines
B welding wire
P electric system
W machined object
Specific embodiment
Embodiments of the present invention are illustrated below with reference to attached drawing.
(the 1st embodiment)
FIG. 1 to FIG. 2 is the figure for illustrating welding system A1 involved in the 1st embodiment.Fig. 1 is to indicate welding system The integrally-built synoptic diagram of A1.Fig. 2 is the functional block diagram for indicating welding system A1.
As shown in Figure 1, welding system A1 has welding supply 1, wire feed unit 2, welding torch 3, power supply line 41,42, power transmission line 5, gas tank 6, gas pipe 7, communication line 8 and welding torch cable 39.Welding supply 1 and welding wire Feed arrangement 2 is connected by power supply line 41, power transmission line 5 and communication line 8.In addition, wire feed unit 2 and welding torch 3 are logical Cross the connection of welding torch cable 39.Welding torch cable 39 cable inner configure power supply line 41, gas pipe 7, sleeve, power transmission line with And communication line.The length of welding torch cable 39 such as more than ten m degree.The sleeve for being configured at welding torch cable 39 is the feed path of welding wire B A part of diameter is fed path also elongated since welding torch cable 39 is long.Power supply line 41, the gas of the inside of welding torch cable 39 Body piping 7, sleeve, power transmission line and communication line respectively with the power supply line 41 of the inside of wire feed unit 2, gas pipe 7, sleeve, power transmission line 5 and communication line 8 connect.
The output terminal of one side of welding supply 1 is connect via power supply line 41 with welding torch 3.Wire feed unit 2 will Welding wire B is sent out to welding torch 3, and keeps the front end of welding wire B prominent from the front end of welding torch 3.It is being configured at the not shown of the front end of welding torch 3 Ignition tip electric connection of power supply line 41 and welding wire B.The output terminal of another party of welding supply 1 is via power supply line 42 and quilt Machining object W connection.Welding supply 1 makes to generate between the front end and machined object W of the front end of welding torch 3 welding wire B outstanding Electric arc provides electric power to electric arc.Welding system A1 carries out the welding of machined object W with the heat of the electric arc.
In addition, in the present embodiment, as shown in Figure 2, welding torch 3 has the structure i.e. feeding portion 31 of feeding welding wire B. That is, welding wire B feed path configuration feeding portion 21 (wire feed unit 2) and feeding portion 31 (welding torch 3) this, as with In the structure of feeding welding wire B.Welding wire B is sent in feeding portion 21 (wire feed unit 2) to direction of feed (direction that welding wire B advances) (push side feeding portion) out.In addition, feeding portion 31 (welding torch 3) configuration than feeding portion 21 (wire feed unit 2) more by feed Welding wire B is drawn (drawing side feeding portion) to direction of feed by direction side.That is, feeding portion 21 (wire feed unit 2) and feeding portion The welding wire feeding system of 31 (welding torches 3) composition push pull mode.In addition, can also consider that welding torch 3 has feeding portion 31, moreover it is possible to consider weldering The feeding portion 31 of a part of structure of silk feed system is configured at welding torch 3.
It provides from welding supply 1 to wire feed unit 2 via power transmission line 5 for making feed motor 211 The electric power (such as DC24V) of equal drivings.In addition, from welding supply 1 provide electric power also by from wire feed unit 2 via Power transmission line (not shown) inside welding torch cable 39 is supplied to welding torch 3.In addition, welding torch 3 can also be by electric from welding Source device 1 is provided directly electric power.In addition, wire feed unit 2 and welding torch 3 can be mentioned other than welding supply 1 For electric power.
Welding supply 1 and wire feed unit 2 are communicated via communication line 8.In addition, 2 He of wire feed unit Welding torch 3 is communicated via the communication line (not shown) being set to inside welding torch cable 39.Welding torch 3 and welding supply 1 will weld Silk feed arrangement 2 is communicated between two parties.In addition, welding torch 3 and welding supply 1 can also be communicated directly.In addition, logical Letter method can be the power line communication using power transmission line or power supply line 41,42, be also possible to channel radio there is no limiting Letter.In addition, the transmitting of the information between welding supply 1, wire feed unit 2 and welding torch 3 can be carried out via control line, It can also be carried out by the level of voltage or electric current, pulse.
Welding system A1 uses protective gas in welding.The protective gas of gas tank 6 is by passing through wire feed unit 2 If gas pipe 7 and be provided to the front end of welding torch 3.In addition, welding system A1 can be such that cooling water recycles in welding torch 3.
The electric power for being used for arc welding is supplied to welding torch 3 by welding supply 1.Welding supply 1 will be from power train The three-phase ac power of system P input is transformed into electric power and output suitable for arc welding.In addition, welding supply 1 will be from electricity The three-phase ac power of Force system P input is transformed into the direct current for driving the feed motor 311 of wire feed unit 2 to wait Power, and it is output to wire feed unit 2 via power transmission line 5.
Welding supply 1 has control unit 11 as shown in Figure 2.Control unit 11 is such as real as microcomputer It is existing, control welding supply 1.Control unit 11 controls inverter circuit (not shown), makes it correspond to the welding condition of setting Output power.In addition, control unit 11 is controlled by the control unit 32 of control unit 22 and welding torch 3 via wire feed unit 2 Feeding portion 21 and feeding portion 31, come the feeding of welding wire B when controlling welding and when crawl.Specifically, 11 butt welding of control unit The control unit 22 of silk feed arrangement 2 sends the speed command S of the feed speed of instruction welding wire B1.In addition, control unit 11 is to welding torch 3 Control unit 32 send instruction welding wire B feed speed speed command S2.Control unit 22 is based on the speed command S received1Come Control feeding portion 21.In addition, control unit 32 is based on the speed command S received2To control feeding portion 31.
11 transmission speed of control unit instructs S1、S2, so that the feed speed in feeding portion 31 becomes faster than the feeding in feeding portion 21 Degree will big several percentages.Since the feed speed in feeding portion 31 (drawing side feeding portion) is greater than (the push side feeding of feeding portion 21 Portion) feed speed, therefore welding wire B bear tension.The feeding resistance for thereby inhibiting welding wire B, prevents the press-bending of welding wire B. The control of the crawl for welding wire B carried out about control unit 11 in detail after describe.
Wire feed unit 2 sends out welding wire B to welding torch 3.Wire feed unit 2 has feeding portion as shown in Figure 2 21 and control unit 22.
Feeding portion 21 is the structure for being driven by the driving signal inputted from control unit 22 and being sent out welding wire B.Feeding portion 21 have feed motor 211, feed rolls 212 and pressure roller 213.
Feed motor 211 generates the driving force for feeding welding wire B.Feed motor 211 is by (aftermentioned from control unit 22 Driving portion 221) input driving signal driving.Feed motor 211 is, for example, brushless motor, by adjusting driving signal To control rotation speed.Control unit 22 (aftermentioned driving portion 221) adjusts driving signal such as by being modulated with pulse width Pulse width control the rotation speed of feed motor 211.
Feed rolls 212 are mounted on the rotary shaft of feed motor 211, are passed the torque generated by feed motor 211 And it rotates.In addition, feed rolls 212 are not limited to be directly installed on the rotary shaft of feed motor 211.It is also possible to by 1 A above gear makes the torque transfer of feed motor 211 to feed rolls 212 and makes the structure of the rotation of feed rolls 212.Welding wire B is contacted with feed rolls 212, by the torque transfer of feed motor 211 at the tangential force for sending out welding wire B.Therefore, pass through feeding Motor 211 is driven to send out welding wire B.
Pressure roller 213 clip welding wire B be configured to it is opposed with feed rolls 212, by welding wire B to 212 side of feed rolls pressurize.Thus Welding wire B corresponds to the rotation of feed rolls 212 and is fed.
Control unit 22 controls wire feed unit 2 such as by realizing microcomputer.Control unit 22 is based on carrying out self-brazing The instruction of the control unit 11 of power supply device 1 is connect to drive feeding portion 21, thus carries out the feeding of welding wire B, in addition, by making not scheme The gas solenoid valve shown is open to provide protective gas to welding torch 3.Control unit 22 as shown in Figure 2 has driving portion 221.
Driving portion 221 controls the driving in feeding portion 21 to control the feeding of welding wire B.Driving portion 221 is based on from the source of welding current The speed command S that the control unit 11 of device 1 receives1Driving signal is output to the feed motor 211 in feeding portion 21.? Feed motor 211 installs encoder (not shown), and control unit 22 is electric from the pulse signal detection feeding inputted by the encoder The rotation speed of motivation 211.In addition, encoder can be the encoder of optical profile type, it is also possible to the encoder of magnetic-type.Driving portion 221 adjustment driving signals so that the rotation speed of the feed motor 211 detected and with speed command S1Corresponding rotation speed Degree is consistent, Lai Jinhang feedback control.In addition, there is no limit for the detection method of rotation speed.
In addition, wire feed unit 2 has the guidance structure of the tubulars such as inlet sleeve, inlet guiding and outlet guide vane Part, but illustration omitted.Welding wire B is directed to feeding from the welding wire reel 23 of winding welding wire B by inlet sleeve and inlet guiding Roller 212.The welding wire B sent out by feed rolls 212 is directed to the submitting mouth of wire feed unit 2 by outlet guide vane.From welding wire into The inside that the sleeve set on the inside of welding torch cable 39 and welding torch 3 is passed through to the welding wire B that device 2 is sent out, is directed into welding torch 3 Front end.The guiding elements such as inlet sleeve, inlet guiding and outlet guide vane and welding torch cable 39 and be set to welding torch 3 The sleeve of inside constitute welding wire B and feed path.
Welding torch 3 carries out the welding of machined object W with the weld power provided from welding supply 1.In addition, welding torch 3 has The structure of standby feeding welding wire B, applies tension by traction welding wire B, makes the feeding drag reduction of welding wire B.Such as Fig. 2 institute of welding torch 3 Show have feeding portion 31, control unit 32, operation portion 33 and display unit 34 like that.
Feeding portion 31 is to be driven by the driving signal inputted from control unit 32 and draw the structure of welding wire B.Feeding portion 31 has Standby feed motor 311, feed rolls 312 and pressure roller 313.
Feed motor 311 generates the driving force for feeding welding wire B.Feed motor 311 is by (aftermentioned from control unit 32 Driving portion 321) input driving signal driving.Feed motor 311 is, for example, brushless motor, by adjusting driving signal To control rotation speed.Control unit 32 (aftermentioned driving portion 321) adjusts driving signal such as by being modulated with pulse width Pulse width control the rotation speed of feed motor 311.
Feed rolls 312 are mounted on the rotary shaft of feed motor 311, are passed the torque generated by feed motor 311 And it rotates.In addition, limiting the torque transfer of feed motor 311 not to the method for feed rolls 312.Welding wire B and feeding Roller 312 contacts, and the torque of feed rolls 312 is transformed into the tangential force of traction welding wire B.Therefore, it is carried out by feed motor 311 Driving, so that welding wire B is drawn.
Pressure roller 313 clip welding wire B be configured to it is opposed with feed rolls 312, by welding wire B to 312 side of feed rolls pressurize.Thus Welding wire B corresponds to the rotation of feed rolls 312 and feeds.
Control unit 32 controls welding torch 3 such as by realizing microcomputer.Control unit 32 corresponds to defeated from operation portion 33 The operation signal entered carries out given processing.In addition, the control of control unit 32 and welding supply 1 and wire feed unit 2 communication, storage unit (not shown) information write-in and reading, the receiving of operation signal from operation portion 33 and into Display etc. in row reply processing, display unit 34.In addition, control unit 32 is based on the control unit 11 from welding supply 1 Instruction carries out the feeding of welding wire B by making the driving of feeding portion 31.As shown in Figure 2, control unit 32 have driving portion 321, Current sensor 322 and arrival test section 323.
Driving portion 321 controls the driving in feeding portion 31 to control the feeding of welding wire B.Driving portion 321 is based on from the source of welding current The speed command S that the control unit 11 of device 1 receives2Driving signal is output to the feed motor 311 in feeding portion 31.? Feed motor 311 installs encoder (not shown), and control unit 32 is electric from the pulse signal detection feeding inputted by the encoder The rotation speed of motivation 311.In addition, encoder can be the encoder of optical profile type, it is also possible to the encoder of magnetic-type.Driving portion 321 adjustment driving signals so that the rotation speed of the feed motor 311 detected and with speed command S2Corresponding rotation speed Degree is consistent, Lai Jinhang feedback control.In addition, there is no limit for the detection method of rotation speed.
Current sensor 322 is the current value for detecting the driving signal that feed motor 311 is output to from driving portion 321 Sensor.Control unit 32 has excess current protective function, the current detection value I for being detected based on current sensor 3222Come Feed motor 311 etc. is protected not influenced by overcurrent.In addition, the current detection value I that current sensor 322 detects2Also defeated Test section 323 is reached out.
Test section 323 is reached based on the current detection value I inputted from current sensor 3222Feeding is reached to detect welding wire B Portion 31.Welding wire B is fed by the feeding portion 21 of wire feed unit 2 first, welding wire B reach welding torch 3 feeding portion 31 after, by into It is fed to portion 21 and feeding portion 31.The feed motor 311 in feeding portion 31 is all nothing until welding wire B reaches feeding portion 31 Load condition, but reach feeding portion 31 (being strictly speaking feed rolls 312) in welding wire B and bear load afterwards.Therefore, it is arrived in welding wire B Up to the front and back in feeding portion 31, the current value for being output to the driving signal of feed motor 311 from driving portion 321 changes.It arrives Up to test section 323 based on the current detection value I inputted from current sensor 3222, from the driving for being output to feed motor 311 The variation detection welding wire B of the current value of signal reaches feeding portion 31.Specifically, reaching test section 323 will be from current sensor 322 The current detection value I of input2With current threshold I2thIt is compared, in current detection value I2As current threshold I2thAbove feelings It is judged as that welding wire B reaches feeding portion 31 under condition.Current threshold I2thIt is set as (welding wire B when 311 no-load condition of feed motor Reach feeding portion 31 before) current detection value I2LWith (the just feeding welding wire B of feeding portion 31 when feed motor 311 bears to load When) current detection value I2HBetween value.
Current detection value I when in the present embodiment, due to no-load condition2LFor 0.3A degree, when bearing load Current detection value I2HFor 0.6A degree, therefore by current threshold I2thIt is set as 0.45A.In addition, current threshold I2thIt is unlimited It is fixed.Although current threshold I2thCloser to current detection value I2LCan detect the arrival of welding wire B fastlyer, but error detection reach can Energy property can be got higher.On the other hand, although current threshold I2thCloser to current detection value I2HThe error detection reached can more be inhibited, but The timing that detection reaches can postpone.Current threshold I2thIn current detection value I2LWith current detection value I2HBetween be suitable for setting be It can.
If reaching test section 323 detects that welding wire B reaches feeding portion 31, just generates and reach detection signal.Reach detection letter Number it is sent to welding supply 1.
Display unit 34 carries out various displays, such as has the display (not shown) of liquid crystal display device.34 quilt of display unit Control unit 32 controls, and carries out the display of various information.Display unit 34 is equivalent to " notification unit " of the invention.
Operation portion 33 has multiple operating units, and operating personnel exports the operation of each operating unit as operation signal To control unit 32.As operating unit, there are welding torch switch, inching button and operation button (not shown).In addition, operation portion 33 Can also have other operating units.
Welding torch switch is beginning/operating unit for stopping operation for receiving to weld.The connection behaviour switched by welding torch Make (pressing), so that operation signal is output to control unit 32.The control unit 32 for being entered the operation signal generates instruction welding The signal of beginning, and send it to welding supply 1.Receive the signal welding supply 1 start welding wire B into It gives, in addition, starting the output of weld power.In addition, being output to control unit 32 by releasing connection operation operation signal.It is defeated The control unit 32 for entering the operation signal generates the signal that instruction welding terminates, and sends it to welding supply 1.It receives The welding supply 1 of the signal stops the feeding of welding wire B, in addition stops the output of weld power.Thus only welding torch is being pressed It is welded during switch.In addition, welding torch switches on-off the transmitting of operation, it can be via the water of the electric signal of control line Flat variation carries out.
Inching button is for receiving the beginning of crawl operation/operating unit for stopping operation.Pass through connecing for inching button Logical operation (pressing), so that operation signal is output to control unit 32.The control unit 32 for being entered the operation signal generates instruction point The dynamic signal started, and send it to welding supply 1.The welding supply 1 for receiving the signal starts welding wire B's Feeding.In addition, by releasing connection operation, so that operation signal is output to control unit 32.It is entered the control of the operation signal Portion 32 generates the signal that instruction crawl terminates, and sends it to welding supply 1.Receive the source of welding current of the signal The feeding of the stopping of device 1 welding wire B.Thus welding wire B is only fed during pressing inching button.In addition, the operation of inching button There is no limit for method.Can be set as whenever press inching button just switch welding wire B feeding and feeding stop.In addition, point The transmitting of the on-off line operation of dynamic button can be to carry out via the horizontal variation of the electric signal of control line.In addition, inching button Welding supply 1 or wire feed unit 2 can be set to.In the present embodiment, even if not indicating that the feeding of welding wire B stops Only, in the case where welding wire B reaches the feeding portion 31 of welding torch 3, also stop the feeding of welding wire B.About chatting later in detail for crawl It states.
Operation button is the operating unit of the operation of the switching or the various setting values of change for carrying out picture.Operation button Such as have upper button, lower button, left button and right button.If pressing each button, corresponding operation signal is output to control Portion 32 processed, control unit 32 carry out corresponding processing.If such as press left button or right button, with regard to switch mode, switching is shown in The picture of display is shown in the setting value of display with regard to changing if pressing button or lower button.In the present embodiment, When can be switched to " Manual Mode " in the operation by left button or right button, receive the operation of inching button.In addition, crawl Operation can be set as carrying out with the operation of operation button (such as left button or right button).Set-point is not needed in this case Dynamic button.
In the present embodiment, feeding portion 21 is equivalent to " the 1st feeding portion " of the invention, and feeding portion 31 is equivalent to the present invention " the 2nd feeding portion ".In addition, control unit 11, control unit 22 and control unit 32 are equivalent to " control unit " of the invention.
Crawl will be illustrated next.
Crawl is for example carried out as new welding wire reel 23 to be mounted on to the preparation work after wire feed unit 2.Operation Personnel by manual work make from welding wire reel 23 pull out welding wire B front end insert wire feed unit 2 inlet sleeve with And inlet guiding, it is directed to feed rolls 212.
Then operating personnel presses the inching button of welding torch 3.Corresponding to pressing for inching button, welding supply 1 is opened The feeding of beginning welding wire B.Specifically, control unit 22 transmission speed of the welding supply 1 (control unit 11) to wire feed unit 2 Instruct S1, S is instructed to 32 transmission speed of control unit of welding torch 32.Control unit 22 (driving portion 221) is based on the speed command received S1To control the rotation speed of feed motor 211.Thus welding wire B with speed command S1Corresponding speed feeding.In addition, control Portion 32 (driving portion 321) processed is based on the speed command S received2To control the rotation speed of feed motor 311.
Welding supply 1 (control unit 11) makes speed command S1Slowly increase from " 0 ", becomes the speed command of setting S1H.In addition, making speed command S2Slowly increase from " 0 ", becomes the speed command S of setting2H.Make speed command S1、S2Slowly increase Add be the current value in order to inhibit the driving signal generated because sharply increasing overshoot.The case where overshoot will not become problem Under, it can also be by speed command S1(S2) from " 0 " it is switched to S1H(S2H)。
Operating personnel releases pressing for the inching button of welding torch 3 in the case where stopping crawl.Corresponding to inching button Releasing, welding supply 1 stop welding wire B feeding.Specifically, welding supply 1 (control unit 11) make to welding wire into The speed command S sent to the control unit 22 of device 21And S is instructed to 32 transmission speed of control unit of welding torch 32Slowly reduce And become " 0 ".Thus the feeding of welding wire B stops.Alternatively, it is also possible to by speed command S1(S2) from S1H(S2H) it is switched to " 0 ".
In the present embodiment, though operating personnel do not indicate welding wire B feeding stop, welding wire B reach welding torch 3 into In the case where portion 31, the feeding of welding wire B also stops.It is described below with reference to Fig. 3 about being automatically stopped for the feeding.
Fig. 3 is the self-braking timing diagram for illustrating the feeding of welding wire B.(a) of Fig. 3 is indicated from welding supply 1 is sent to the speed command S of wire feed unit 21Time change, Fig. 3 (b) expression be sent to from welding supply 1 The speed command S of welding torch 32Time change.(c) of Fig. 3 indicates the current detection value I that current sensor 322 detects2When Between change.(d) of Fig. 3 indicates that reaching the arrival that test section 323 is sent detects signal.What (e) expression of Fig. 3 was born in welding wire B The time change of tension.(f) of Fig. 3 indicates the time change of the amount of feeding of welding wire B.
If starting crawl, speed command S in moment t01、S2Slowly increase.Then speed command S1Speed as setting Degree instruction S1H, speed command S2Speed command S as setting2H((a), (b) with reference to Fig. 3).When feeding beginning, driving Portion 321 is output in the current value of the driving signal of feed motor 311 and generates overshoot, thus current detection value I2As electric current Threshold value I2thAbove (with reference to (c) of Fig. 3).Therefore, since feeding to by until given time T1 (from moment t0 to given Between moment t4), test section 323 is reached without detection.Then welding wire B is fed with constant speed, and the amount of feeding increases (with reference to figure 3 (f)).At this moment, since welding wire B is not yet reached feeding portion 31 (feed rolls 312), it is nothing that feed motor 311, which dallies, Load condition.Therefore, current detection value I2Current detection value I when as no-load condition2L(with reference to (c) of Fig. 3).
If the front end of welding wire B reaches feeding then when the amount of feeding of moment t1 welding wire B becomes L1 (with reference to (f) of Fig. 3) Tension slowly bears feeding path interior several curved welding wire B in portion 31 (feed rolls 312) (with reference to (e) of Fig. 3).Due to right It should bear to load in feed motor 311 in this, therefore current detection value I2Increase (with reference to (c) of Fig. 3).
If in moment t2 current detection value I2As current threshold I2thAbove (with reference to (c) of Fig. 3), then test section is reached 323 detect that welding wire B reaches feeding portion 31, will reach detection signal and are sent to welding supply 1 (with reference to (d) of Fig. 3).It connects The welding supply 1 for receiving arrival detection signal makes speed command S1、S2It reduces and becomes " 0 " ((a), (b) with reference to Fig. 3). Thus feed motor 211 and feed motor 311 stop, and the feeding of welding wire B stops (with reference to (f) of Fig. 3).At this moment, exist The tension that welding wire B is born reduces and becomes " 0 " (with reference to (e) of Fig. 3), corresponds to this current detection value I2It reduces and becomes " 0 " (with reference to (c) of Fig. 3).In addition, (moment t1) plays the arrival detection of test section 323 when reaching feed rolls 312 from the front end of welding wire B Until (moment t2) when reaching, all persistently feedings of welding wire B.But the time (t2-t1) fills compared with the whole feeding time It is point small, it is extremely micro (such as counting cm degree) in the amount of feeding of the welding wire B of time feeding.
In the case where the feeding of welding wire B is automatically stopped, the control unit 32 of welding torch 3 makes to show on the display of display unit 34 It is automatically stopped.Operating personnel can be automatically stopped by seeing that the display is known.In addition, make operating personnel know into Self-braking method of having gone does not limit.It can also be notified by the sound from loudspeaker (not shown), it can be with Light lamp (not shown) to notify.Alternatively, it is also possible to notify the vibration of welding torch 3.In addition, control unit 32 can pass through arrival The arrival detection signal that test section 323 exports is automatically stopped to detect, and can also be believed by the communication from welding supply 1 Number (speed command S2Or notify self-braking signal) detection be automatically stopped.
After being automatically stopped, operating personnel is welded by the operation of inching button from feeding portion 31 to the front end of welding torch 3 The feeding of silk B.At this moment, the control unit 11 of welding supply 1 is by speed command S1It is set as and speed command S1HCompared to feeding speed Degree wants slow speed command S1L, by speed command S2It is set as and speed command S2HSlow speed command S is wanted compared to feed speed2L。 In the present embodiment, by speed command S1HIt is set as the speed of welding wire B every 1 minute feeding 15~20m degree, by speed command S1LIt is set as the speed of welding wire B every 1 minute feeding number m degree, by speed command S2H(S2L) it is set as specific rate instruction S1H (S1L) big several percentages speed.In addition, speed command S1H、S1L、52H、S2LThere is no restrictions.Due to from feeding portion 31 to The distance of the front end of welding torch 3 is short (such as tens of cm degree), therefore even if feed speed is slack-off, and the increase of the time needed is also few On the other hand, slack-off by feed speed, it is easy to make operator in suitable timing feed-disabling.Alternatively, it is also possible to be not control Portion 11 processed carries out speed command S automatically1、S2Change, but operator carries out speed by the operation of the operation portion 33 of welding torch 3 Degree instruction S1、S2Change.Alternatively, it is also possible to by speed command S1(S2) keep speed command S1H(S2) constant.
Fig. 4 is the flow chart for illustrating the processing of the crawl in welding system A1.Fig. 4 (a) indicates welding supply 1 The point operation control processing that control unit 11 is carried out, Fig. 4 (b) indicate the arrival detection processing that the control unit 32 of welding torch 3 is carried out.
The processing of point operation control shown in Fig. 4 (a) starts when welding supply 1 starts.In addition, the processing can be " Manual Mode " Shi Zhihang is switched in welding torch 3.Control unit 11 discriminates whether that indicating crawl starts (S1) first.Specifically, Control unit 11 discriminates whether the signal since the control unit 32 of welding torch 3 receives instruction crawl.Do not indicating what crawl started In the case of (S1 "No"), return to step S1, repeat the differentiation.That is, control unit 11 is all standby until indicating that crawl starts.If It indicates crawl and starts (S1 "Yes"), then control unit 11 indicates that the feeding of welding wire B starts (S2).Specifically, 11 one side of control unit Make speed command S1Increase to S from " 0 "1HIt is sent to wire feed unit 2 on one side.In addition, making speed command S on one side2Increase from " 0 " It is added to S2HIt is sent to welding torch 3 on one side.
Following control unit 11 discriminates whether that indicating crawl terminates (S3).Specifically, control unit 11 is discriminated whether from weldering The control unit 32 of torch 3 receives the signal that instruction crawl terminates.(S3 "No"), control unit in the case where not indicating that crawl terminates 11 discriminate whether to receive arrival detection signal (S4) from the control unit 32 of welding torch 3.The feelings for reaching detection signal are not being received Under condition (S4 "No"), step S3 is returned to, repeats the differentiation of step S3 and step S4.That is, control unit 11 is until indicating crawl knot Beam receives all standby until arrival detects signal.If indicating crawl terminates (S3 "Yes") or receives arrival detection signal (S4 "Yes"), then control unit 11 indicates that the feeding of welding wire B stops (S5).Specifically, control unit 11 makes speed command S on one side1From S1HIt is reduced to " 0 " and is sent to wire feed unit 2 on one side.In addition, making speed command S on one side2From S2H" 0 " is reduced to send on one side To welding torch 3.Then processing returns to step S1, and control unit 11 is all standby until indicating that crawl starts.
Arrival detection processing shown in Fig. 4 (b) starts when welding torch 3 starts.In addition, control processing can only switch For " Manual Mode " Shi Zhihang.Control unit 32 discriminates whether to receive speed command S from control unit 11 first1(S11).It is not connecing In the case where receiving (S11 "No"), step S11 is returned to, repeats the differentiation.That is, control unit 32 is until receiving speed command S1 Until it is all standby.If receiving speed command S1(S11 "Yes"), then control unit 32 waits for given time T1 (S12).Due to Understand the arrival that allow because of the overshoot for the current value for feeding the driving signal that generate when beginning and reach 323 error detection welding wire B of test section, Therefore detection until overshoot convergence all without reaching test section 323.This therebetween, control unit 32 corresponds to from control The speed command S that portion 11 receives1Increase the rotation speed of feed motor 311.
After given time T1 warp (S12 "Yes"), the detection of control unit 32 is input to the driving signal of motor 311 Current value (S13).Specifically, control unit 32 obtains the current detection value I that current sensor 322 detects2And it is entered into Reach test section 323.Test section 323 is next arrived at by current detection value I2With current threshold I2thIt is compared (S14).? Current detection value I2Insufficient current threshold I2thIn the case where (S14 "No"), processing return to S13.On the other hand, in current detecting Value I2For current threshold I2thIn the case where above (S14 "Yes"), reach test section 323 and generate arrival detection signal.Control unit 32 Detection signal will be reached and be sent to welding supply 1 (S15).Following control unit 32 waits for given time T2 (S16). This therebetween, control unit 32 corresponds to the speed command S that receives from control unit 111Make the rotation speed of feed motor 311 It reduces, stops feed motor 311.Then processing returns to S11, and 32 latency speed of control unit instructs S1Reception.
In addition, processing shown in each flow chart of Fig. 4 is an example, point operation control processing and control that control unit 11 is carried out The arrival detection processing that portion 32 processed is carried out is not limited to above-mentioned.
The function and effect of welding system A1 will be illustrated next.
According to the present embodiment, test section 323 is reached in the current detection value I inputted from current sensor 3222As electricity Flow threshold value I2thIn the case where above, it is judged as that welding wire B reaches feeding portion 31, detection signal will be reached and be sent to source of welding current dress Set 1.If the control unit 11 of welding supply 1 receives arrival detection signal, make speed command S1、S2Reduce and become " 0".Thus feed motor 211 and feed motor 311 stop, and the feeding of welding wire B stops.Therefore, operating personnel can be from length Phase persistently presses time inching button and waits or the extra welding wire B cutting excessively emerged from the front end of welding torch etc. is loaded down with trivial details It is freed in affairs.In addition, also having the electric current for overcurrent protection in the existing welding torch for having feed motor Sensor 322.Test section 323 is reached due to the current detection value I that detects based on the current sensor 3222Judged, because This welding system A1 does not need the new testing agency for having for detecting welding wire B.Therefore, capable of inhibiting each device, structure is complicated Change, in addition, the increase of manufacturing cost can be inhibited.
In addition, according to the present embodiment, in the case where the feeding of welding wire B is automatically stopped, the control unit 32 of welding torch 3 makes to show Show that display is automatically stopped on the display in portion 34.Thus operating personnel can be known and seeing the display carried out it is automatic Stop.
In addition, according to the present embodiment, welding torch 3 has feeding portion 31.Due to from feeding portion 31 to the front end of welding torch 3 away from From short, by being automatically stopped, can be shortened for before being manually operated the welding wire B for being fed into feeding portion 31 and being fed into welding torch 3 The time at end.
In addition, in the present embodiment, illustrating to reach test section 323 for current detection value I2With current threshold I2thInto The case where arrival that row relatively judges welding wire B, but it is not limited to this.Such as it can be set and calculate the output of current sensor 322 Current detection value I1Differential value calculation section, reach test section 323 by the differential value that calculates calculation section and threshold value into Arrival of the row relatively to judge welding wire B.In this case, and by current detection value I2With current threshold I2thThe case where comparing phase Than, although the arrival of welding wire B can be detected as early as possible, error detection reach a possibility that get higher.It reaches test section 323 and is based on electric current Detected value I2Judge the arrival of welding wire B, the gimmick of judgement corresponds to current detection value I2Variation waveform be suitable for setting ?.
In the present embodiment, it illustrates current threshold I2thThe case where being set as fixed value, but it is not limited to this.Speed Instruct S2HCurrent detection value I when more big then feed motor 311 is no-load condition2LAlso bigger.Therefore, by current threshold Value I2thIn the case where being set as fixed value, if speed command S2HGreatly, current threshold I2thWith current detection value I2LDifference will become It is small.In this way, which a possibility that reaching the arrival of 323 error detection welding wire B of test section will get higher.This case in order to prevent, Reaching test section 323 can correspond to speed command S2HMake current threshold I2thVariation.Pass through speed command S2HIt is more big just all the more High current threshold value I2th, current threshold I can be inhibited2thWith current detection value I2LDifference become smaller, reach test section 323 can inhibit erroneous detection A possibility that survey.In the present embodiment, speed command S2HIt is equivalent to " instruction value of the feed speed of welding wire " of the invention.Separately Outside, reaching test section 323 can correspond to speed command S1H, feed motor 311 or feed motor 211 actual rotation Speed etc. makes current threshold I2thVariation.
In the present embodiment, illustrate that reaching test section 323 is based on current detection value I2To judge the arrival of welding wire B Situation, but it is not limited to this.Such as has in control unit 32 and detect the electric power for being output to feed motor 311 from driving portion 321 Sensor in the case where, reach test section 323 can judge welding wire B's based on the electric power detected value that the sensor detects It reaches.In addition, having the feelings for the sensor for detecting the voltage for being output to feed motor 311 from driving portion 321 in control unit 32 Under condition, the arrival of welding wire B can be judged based on the voltage detecting value that the sensor detects by reaching test section 323.In addition, arriving The arrival of welding wire B can be judged based on the rotation speed of feed motor 311 up to test section 323.As described above, feeding electricity The rotation speed of motivation 311 is detected from the output for the encoder for being installed on feed motor 311.If in no-load condition Shi Yiheng Current control (fixed torque control) drives feed motor 311, then is fed electronic due to the load rising when welding wire reaches The rotation speed of machine 311 reduces.Therefore, welding wire can be detected based on the rotation speed of feed motor 311 to reach.In addition, by defeated The setting value for arriving the electric current of feed motor 211,311 out is set as suitable current value, when which makes non-loaded into It is higher than the tangential velocity of feed rolls 212 to the tangential velocity of roller 312.In addition, needing after welding wire reaches for preventing welding wire B's The countermeasure of press-bending.As the countermeasure, such as considers to switch to the method for speed control from constant current controlling, makes speed command S1Drop Low method etc., but do not limit.
In the present embodiment, illustrate that the detection of current sensor 322 is output to feed motor 311 from driving portion 321 Driving signal current value the case where, but it is not limited to this.Such as current sensor 322 can detecte and be had from welding torch 3 Power supply (not shown) provide to driving portion 321 electric current current value.In addition, current sensor 322 can detecte from welding Power supply device 1 or wire feed unit 2 provide the current value of the electric current to the power supply of welding torch 3.If being output to feed motor 311 Driving signal current value variation, then these electric currents similarly change, therefore the electricity that can be detected based on current sensor 322 Flow valuve detects the arrival of welding wire B.In these cases, it may be said that the detection of current sensor 322, which provides, arrives feed motor 311 Electric current.
In the present embodiment, illustrate that control unit 22 has driving portion 221, control unit 32 has driving portion 321, electric current The case where sensor 322 and arrival test section 323, but it is not limited to this.Control unit 11 can have driving portion 221, driving Portion 321, current sensor 322 and arrival test section 323.That is, welding supply 1 can be to provide to feeding The driving signal of motor 211 and feed motor 311 controls the rotation of feed motor 211 and feed motor 311 The structure of rotary speed.It in this case, can be in the driving signal of the inside of welding supply 1 progress current sensor 322 The detection of current value and the judgement for reaching test section 323.In the case where the variation, control unit 11 is equivalent to the present invention " control unit ".
In the present embodiment, the case where driving portion 221 controls the rotation speed of feed motor 211 is illustrated, but simultaneously It is without being limited thereto.Driving portion 221 also can control the torque of feed motor 211.
In the present embodiment, the case where feeding portion 21 is sent out welding wire B by the rotation of feed rolls 212 is illustrated, But it is not limited to this.Feeding portion 21 can also be sent out welding wire B with other methods.
In the present embodiment, illustrate that the case where stopping the feeding of welding wire B when detecting the arrival of welding wire B is (automatic Stop), but it is not limited to this.Welding wire B is reached into welding torch 3 (feeding portion 31) this feelings with can not also stopping the feeding of welding wire B Condition is reported to operating personnel.Report method can be the display on the display of display unit 34, be also possible to from loudspeaker Sound, can also be lighting for lamp, be also possible to the vibration of welding torch 3.Operating personnel can recognize welding wire B according to these notifications Welding torch 3 is reached, the feeding of welding wire B is stopped.
(variation)
Fig. 5 and Fig. 6 is the figure for illustrating the variation of welding system A1 involved in the 1st embodiment.Fig. 5 is to use In the flow chart for illustrating the processing of crawl involved in the variation.Fig. 6 is timing diagram involved in the variation.The variation is not It is the feeding of the stopping welding wire B when welding wire B reaches feeding portion 31, but after welding wire B to be further fed into the front end of welding torch 3 Stop.
Fig. 5 indicates the point operation control processing that control unit 11 involved in variation is carried out.In addition, involved in variation The arrival detection processing that control unit 32 is carried out as same as flow chart shown in Fig. 4 (b), record and say by omission It is bright.
The flow chart of point operation control processing shown in fig. 5, it is same as flow chart shown in Fig. 4 (a) for step S1~S5. Flow chart shown in fig. 5 is proceeding to step the case where step S4 receives arrival detection signal by control unit 11 (S4 "Yes") Before rapid S5, the processing of additional step S6 and step S7 is different from flow chart shown in Fig. 4 (a) in this regard.
In the case where control unit 11 receives arrival detection signal (S4 "Yes"), control unit 11 indicates the feeding of welding wire B The deceleration (S6) of speed.Specifically, control unit 11 makes speed command S on one side1From S1HIt is reduced to S1LIt is sent to welding wire feeding on one side Device 2.In addition, making speed command S on one side2From S2HIt is reduced to S2LIt is sent to welding torch 3 on one side.Following control unit 11 is waiting warp It crosses (S7) after given time T3, the feeding of instruction welding wire B stops (S5).Given time T3 be based on with speed command S1LAccordingly The time of the front end of the front end arrival welding torch 3 of speed feeding welding wire B, welding wire B sets.The setting of given time T3 also consider from The front end of welding wire B is played when reaching feed rolls 312 detects the amount of feeding until reaching, step S6 by arrival test section 323 The feeding of the amount of feeding of deceleration midway and step S5 stop in deceleration when the amount of feeding.Given time, T3 was equivalent to this hair Bright " low velocity feeds the time ".In addition, the given time T2 in the arrival detection processing carried out to control unit 32 is (with reference to figure 4 (b) step S16) add given time T3.In addition, processing shown in the flow chart of Fig. 5 is an example, control unit 11 is carried out Point operation control processing be not limited to it is above-mentioned.
Fig. 6 is the self-braking timing diagram for illustrating feeding involved in variation.Timing diagram shown in fig. 6 when Quarter, t0~moment t2 was same as timing diagram shown in Fig. 3, and and the description is omitted.
If in moment t2 current detection value I2As current threshold I2thAbove (with reference to (c) of Fig. 6), then test section is reached 323 detect that welding wire B reaches 31 this case of feeding portion, and will reach detection signal and be sent to welding supply 1 (with reference to figure 6 (d)).The welding supply 1 for receiving arrival detection signal makes speed command S1From S1HIt reduces and becomes S1L(refer to Fig. 6 (a)), make speed command S2From S2HIt reduces and becomes S2L(with reference to (b) of Fig. 6).Feed motor 211 and feeding as a result, Motor 311 slows down, and the feed speed of welding wire B reduces (with reference to (f) of Fig. 6).Increase in the tension that welding wire B is born given Value, later lasting given value (with reference to (e) of Fig. 6).Corresponding to this, current detection value I2It is also added to current detection value I2H, it Follow current detected value I afterwards2H(with reference to (c) of Fig. 6).
If becoming moment t3 from moment t2 by given time T3, welding supply 1 makes speed command S1、S2Subtract Become " 0 " ((a), (b) with reference to Fig. 6) less.Thus feed motor 211 and feed motor 311 stop, welding wire B's Feeding stops (with reference to (f) of Fig. 6).At this moment it is reduced in the tension that welding wire B is born and becomes " 0 " (with reference to (e) of Fig. 6), with this It is corresponding, current detection value 12It reduces and becomes " 0 " (with reference to (c) of Fig. 6).
In the case of this variation, also when the feeding of welding wire B is automatically stopped, the control unit 32 of welding torch 3 makes display unit Display is automatically stopped on 34 display.Operating personnel can be known and seeing the display to be automatically stopped.Separately Outside, when welding wire B reaches feeding portion 31 (moment t2), the control unit 32 of welding torch 3 can also make to show on the display of display unit 34 Show the meaning.In this case, operating personnel can be automatically stopped by seeing that the display is known immediately in advance.
Alternatively, it is also possible to be after moment t2 welding wire B reaches feeding portion 31, welding supply 1 does not make speed command S1 (S2) from S1H(S2H) change.
According to this modification, after welding wire B is fed into the front end of welding torch 3, feeding is automatically stopped.Therefore, operating personnel The further progress crawl after being automatically stopped is not needed.In addition, in this variation, not needing to have for detecting welding wire B yet New testing agency.
(the 2nd embodiment)
Fig. 7 is the figure for illustrating welding system A2 involved in the 2nd embodiment, is the function of indicating welding system A2 The block diagram of structure.In the figure, same reference numerals are marked to the same or similar element of welding system A1 (Fig. 2 reference), The repetitive description thereof will be omitted.In addition, omitting the record of welding torch 3 in Fig. 7.
Welding system A2 involved in present embodiment is on this abnormal aspect in the structure of detection feeding welding wire B and welds System A1 is different.
Control unit 22 involved in present embodiment has speed detecting portion 222 and amount of feeding calculation section 223.
The feed speed of the detection of speed detecting portion 222 welding wire B.Speed detecting portion 222 for example have be installed on feeding it is electronic The encoder of machine 211.The encoder generates pulse signal corresponding with the rotation speed of feed motor 211.Speed detecting portion 222 detect the rotation speed of feed motor 211 based on the pulse signal that encoder generates.Then it is calculated from the rotation speed The feed speed of welding wire B.The feed speed of calculating is output to amount of feeding calculation section 223 by speed detecting portion 222.In addition, the 1st is real Although applying wire feed unit 2 involved in mode also omits record, also has speed detecting portion 222.
Amount of feeding calculation section 223 is entered feed speed from speed detecting portion 222, calculates the welding wire B from crawl The amount of feeding.Amount of feeding calculation section 223 is calculated by being integrated to the feed speed inputted from speed detecting portion 222 from point The amount of feeding of the dynamic welding wire B started.In addition, there is no limit for the calculation method of the amount of feeding.Control unit 22 calculates the amount of feeding The amount of feeding since crawl that portion 223 calculates is sent to welding supply 1.In addition, speed detecting portion 222 can will be into It is output to amount of feeding calculation section 223 to the rotation speed of motor 211, amount of feeding calculation section 223 calculates welding wire B from rotation speed Feed speed.
Control unit 11 involved in present embodiment is also equipped with abnormity detection portion 111.
Abnormity detection portion 111 is based on the feeding since crawl received by the control unit 22 of wire feed unit 2 Amount and the arrival detection signal received by the control unit 32 of welding torch 3, the exception in structure to detect feeding welding wire B.Do not having In the case where having exception, become in the amount of feeding from crawl from feeding portion 21 (feed rolls 212) to (feeding of feeding portion 31 Roller 312) the length L1 fed path when, should receive arrival detection signal.Therefore, in the amount of feeding from crawl It is not received yet more than L1 in the case where reaching detection signal, or be received by before the amount of feeding from crawl reaches L1 In the case where reaching detection signal, it can be judged as there is exception.
Abnormity detection portion 111 becomes the 1st given value (L1+ α) or more in the amount of feeding from crawl and does not receive yet It is judged as there is exception in the case where reaching detection signal.In this case, it is believed that be the feeding that welding wire B is bent in sleeve The exception of portion 21 or driving portion 221, exception of current sensor 322 etc..α (> 0) is the tune for preventing abnormal error detection Whole value.In addition, abnormity detection portion 111 the amount of feeding from crawl be the 2nd given value (L1- β) below when, receiving It is judged as there is exception in the case where reaching detection signal.In this case, it is believed that be feeding portion 31 or driving portion 321 exception, Exception of current sensor 322 etc..β (> 0) is the adjusted value for preventing abnormal error detection.
Control unit 11 stops the feeding of welding wire B in the case where abnormity detection portion 111 detects exception, and notification has occurred It is abnormal.Specifically, control unit 11 is by by speed command S1(S2) from S1H(S2H) " 0 " is switched to stop the feeding of welding wire B.Separately Outside, the control unit 32 that abnormal abnormal signal is sent to welding torch 3 is had occurred in expression by control unit 11.It include table in abnormal signal Show the information of abnormal classification.The control unit 32 for receiving abnormal signal makes display on the display of display unit 34 that exception have occurred And it corresponding with abnormal classification records.In addition, there is no limit for abnormal report method.Furthermore it is possible to by the source of welding current Device 1 or wire feed unit 2 report exception.
According to the present embodiment, the exception in the structure of feeding welding wire B can be detected.And by detecting abnormal feelings Stop the feeding of welding wire B under condition, failure or accident can be prevented.In addition, in the case where detecting exception, it can be by abnormal hair Raw notice gives industry personnel.In addition, not needing the new testing agency for having for detecting welding wire B in the present embodiment yet.
(the 3rd embodiment)
Fig. 8 and Fig. 9 is the figure for illustrating welding system A3 involved in the 3rd embodiment.Fig. 8 is to indicate welding system The block diagram of the functional structure of system A3.Fig. 9 is the self-braking timing diagram for illustrating the feeding of welding wire B.In these figures, right Same reference numerals are marked with welding system A1 (referring to Fig. 2 and Fig. 3) same or similar element, the repetitive description thereof will be omitted.
Welding system A3 involved in present embodiment with wire feed unit 2 detect welding wire B reach feeding portion 31 this It is different from welding system A1 on point.
Control unit 32 involved in present embodiment does not reach test section 323.In addition, about current sensor 322, by It is not related in the detection of the arrival with the welding wire B in present embodiment, therefore omit and record.On the other hand, present embodiment Related control unit 22 has current sensor 224 and reaches test section 225.
Current sensor 224 is the current value for detecting the driving signal that feed motor 211 is output to from driving portion 221 Sensor.Control unit 22 has excess current protective function, the current detection value I for being detected based on current sensor 2241Come Protect feed motor 211 equal not by overcurrent.In addition, the current detection value I that current sensor 224 detects1Also it is output to Reach test section 225.
Test section 225 is reached based on the current detection value I inputted from current sensor 2241Feeding is reached to detect welding wire B Portion 31.Welding wire B is fed by the feeding portion 21 of wire feed unit 2 first, welding wire B reach welding torch 3 feeding portion 31 after, by into It is fed to portion 21 and feeding portion 31.The feed motor 211 in feeding portion 21 is all born until welding wire B reaches feeding portion 31 Big load, but reach (being strictly speaking the feed rolls 312) back loading of feeding portion 31 in welding wire B and mitigate.Therefore, it is arrived in welding wire B Up to the front and back in feeding portion 31, the current value variation of the driving signal of feed motor 211 is output to from driving portion 221.Reach inspection Survey portion 225 is based on the current detection value I inputted from current sensor 2241, from the driving signal for being output to feed motor 211 Current value variation detect welding wire B reach feeding portion 31.
(c) of Fig. 9 indicates the current detection value I that current sensor 224 detects1Time change.Then from moment t4 T1 is carved, as time goes by, the amount of feeding of welding wire B increases.Due to corresponding to this, the feeding resistance of welding wire B bit by bit increases, Therefore also bit by bit increase in the load that feed motor 211 is born.Corresponding to this, current detection value I1Also bit by bit increase Add.And if feeding portion 31 is reached in moment t1 welding wire B, in the load reduction that feed motor 211 is born.Thus electric current is examined Measured value I1It reduces.(d) of Fig. 9 is indicated to current detection value I1Carry out the time change of the current differential value of differential.Such as (d) of Fig. 9 Shown such, current differential value is positive value from moment t4 to moment t1.Also, due in moment t1 current detection value I1It reduces And current differential value becomes negative value.It reaches test section 225 and detects welding wire B arrival feeding portion 31 based on the variation.
Specifically, test section 225 is reached to the current detection value I inputted from current sensor 2241Differential is carried out to calculate Current differential value.And it reaches test section 225 to be compared the current differential value of calculating and differential threshold value, in current differential value As in differential threshold value situation below, be judged as welding wire B reach feeding portion 31.In the present embodiment, differential threshold value is set For " 0 ".In addition, there is no limit for differential threshold value.In addition, reach test section 225 can with other methods detect welding wire B reach into To portion 31.
According to the present embodiment, test section 225 is reached in the current detection value I that will be inputted from current sensor 2241Differential Current differential value become differential threshold value situation below under, be judged as welding wire B reach feeding portion 31, and by reach detect signal It is sent to welding supply 1.If the control unit 11 of welding supply 1 receive arrival detection signal, just make welding wire B into To stopping.Therefore, operating personnel can be from long lasting for according to inching button and waiting or will excessively emerge from the front end of welding torch The loaded down with trivial details affairs such as extra welding wire B cutting in free.In addition, also have in existing wire feed unit for The current sensor 224 of current protection.Reach the current detection value I that test section 225 is detected based on the current sensor 2241 Judged, therefore welding system A3 does not need the new testing agency for detecting welding wire B.Therefore, each device can be inhibited Structure is complicated changes, in addition, can inhibit the increase of manufacturing cost.
In addition, the control unit 32 of welding torch 3, which can have, reaches test section 323 in the 3rd embodiment.In the structure In the case of, the arrival of welding wire B can be detected respectively with arrival test section 323 in arrival test section 225.Test section can be reached 225 and reach 323 liang of sides of test section all detect arrival in the case where make feeding stop, can also reach test section 225 or The one party of arrival test section 323 stops feeding in the case where detecting arrival.
(the 4th embodiment)
Figure 10 and Figure 11 is the figure for illustrating welding system A4 involved in the 4th embodiment.Figure 10 is to indicate to weld The integrally-built synoptic diagram of welding system A4.Figure 11 is the block diagram for indicating the functional structure of welding system A4.In these figures, right Same reference numerals are marked with welding system A1 (referring to Fig. 1 and Fig. 2) same or similar element, the repetitive description thereof will be omitted. In addition, omitting the record of the internal structure of welding torch 3 ' in Figure 11.
In welding system A4 involved in present embodiment, welding torch 3 ' is functioned not as the feed arrangement of drawing side, It replaces, is also equipped with the drawing-type wire-feed motor 9 for becoming the feed arrangement of drawing side, it is different from welding system A1 in this regard.
Without feeding portion 31, driving portion 321, electricity in the welding torch 3 involved in the 1st embodiment of welding torch 3 ' (referring to Fig. 2) Flow sensor 322 and arrival test section 323.That is, welding torch 3 ' does not feed the function of welding wire B, about other function, with welding torch 3 is same.
Drawing-type wire-feed motor 9 feeds welding wire B, applies tension by traction welding wire B, makes the feeding drag reduction of welding wire B. Drawing-type wire-feed motor 9 as shown in Figure 10, lean on by the feeding path for welding wire B between wire feed unit 2 and welding torch 3 ' Nearly welding torch 3 ' and configure.Specifically, drawing-type wire-feed motor 9 is connect by welding torch cable 39 with wire feed unit 2.In addition, leading Pull-type wire-feed motor 9 with the welding torch cable 39 ' of 39 same structure of welding torch cable with welding torch 3 ' by connecting.The length of welding torch cable 39 E.g. more than ten m degree, in contrast, the length of welding torch cable 39 ' are, for example, number m degree.Drawing-type wire-feed motor 9 and welding wire into It is communicated to device 2 via the communication line (not shown) being set to inside welding torch cable 39.In addition, 9 He of drawing-type wire-feed motor Welding torch 3 ' is communicated via the internal communication line (not shown) of welding torch cable 39 ' is set to.Drawing-type wire-feed motor 9 and welding electricity Source device 1 is communicated by transferring in being carried out by wire feed unit 2.In addition, drawing-type wire-feed motor 9 and source of welding current dress Setting 1 can also directly be communicated.In addition, there is no limit for communication means.As shown in Figure 11, drawing-type wire-feed motor 9 has Standby feeding portion 91 and control unit 92.
Feeding portion 91 is to be driven by the driving signal inputted from control unit 92 and draw the structure of welding wire B.Feeding portion 91 Have feed motor 911, feed rolls 912 and pressure roller 913.
Feed motor 911 generates the driving force for feeding welding wire B.Feed motor 911 by from control unit 92 (after The driving portion 921 stated) input driving signal driving.Feed motor 911 is, for example, brushless motor, by adjusting driving letter Number control rotation speed.Control unit 92 (aftermentioned driving portion 921) adjustment driving signal such as being modulated with pulse width Pulse width, to control the rotation speed of feed motor 911.
Feed rolls 912 are mounted on the rotary shaft of feed motor 911, are passed the torque generated by feed motor 911 And it rotates.In addition, limiting the torque transfer of feed motor 911 not to the method for feed rolls 912.Welding wire B and feeding Roller 912 contacts, and the torque of feed rolls 912 is transformed into the tangential force of traction welding wire B.Therefore, it is carried out by feed motor 911 Driving and welding wire B is drawn.
Pressure roller 913 clip welding wire B and be configured to it is opposed with feed rolls 912, by welding wire B to 912 side of feed rolls pressurize.By This welding wire B corresponds to the rotation of feed rolls 912 and feeds.
Control unit 92 controls drawing-type wire-feed motor 9 such as realizing as microcomputer.Control unit 92 is based on from welding The instruction of the control unit 11 of power supply device 1 come make feeding portion 91 drive, thus carry out welding wire B feeding.Control unit 92 has drive Dynamic portion 921, current sensor 922 and arrival test section 923.
Driving portion 921 controls the driving in feeding portion 91 to control the feeding of welding wire B.Driving portion 921 is based on from the source of welding current The speed command S that the control unit 11 of device 1 receives2Driving signal is output to the feed motor 911 in feeding portion 91.? Feed motor 911 installs encoder (not shown), the detection of control unit 92 from the pulse signal detection inputted by the encoder into To the rotation speed of motor 911.In addition, encoder can be the encoder of optical profile type, it is also possible to the encoder of magnetic-type.It drives Dynamic portion 921 adjusts driving signal so that the rotation speed of the feed motor 911 detected and with speed command S2Corresponding rotation Rotary speed is consistent, Lai Jinhang feedback control.In addition, there is no limit for the detection method of rotation speed.
Current sensor 922 is the current value for detecting the driving signal that feed motor 911 is output to from driving portion 921 Sensor.Control unit 92 has excess current protective function, is used for the current detection value I detected based on current sensor 9222 To protect feed motor 911 etc. not influenced by overcurrent.In addition, the current detection value I that current sensor 922 detects2 Also it is output to and reaches test section 923.
Test section 923 is reached based on the current detection value I inputted from current sensor 9222Feeding is reached to detect welding wire B Portion 91.Welding wire B is fed by the feeding portion 21 of wire feed unit 2 first, reaches the feeding portion of drawing-type wire-feed motor 9 in welding wire B After 91, it is fed portion 21 and feeding portion 91 and feeds.The feed motor 911 in feeding portion 91 reaches feeding portion 91 until welding wire B Until be all no-load condition, but welding wire B reach feeding portion 91 (being strictly speaking feed rolls 912) afterwards bear load.Therefore, Before and after welding wire B reaches feeding portion 91, the current value for being output to the driving signal of feed motor 911 from driving portion 921 becomes Change.Test section 923 is reached based on the current detection value I inputted from current sensor 9222, from being output to feed motor 911 The variation detection welding wire B of the current value of driving signal reaches feeding portion 91.Involved by specific detection method and the 1st embodiment Arrival test section 323 it is same.If reaching test section 923 detects that welding wire B reaches feeding portion 91, just generates and reach detection letter Number.It reaches detection signal and is sent to welding supply 1.
In the present embodiment, feeding portion 21 is equivalent to " the 1st feeding portion " of the invention, and feeding portion 91 is equivalent to the present invention " the 2nd feeding portion ".In addition, control unit 11, control unit 22 and control unit 92 are equivalent to " control unit " of the invention.
According to the present embodiment, test section 923 is reached in the current detection value I inputted from current sensor 9222As electricity Flow threshold value I2thIn the case where above, it is judged as that welding wire B reaches feeding portion 91, so that will reach detection signal is sent to welding electricity Source device 1.If the control unit 11 of welding supply 1 receives arrival detection signal, just stop the feeding of welding wire B.Therefore, Operating personnel can be from long lasting for according to inching button and the extra welding wire that waits or will excessively emerge from the front end of welding torch It is freed in miscellaneous affairs such as B cutting.In addition, also having the electricity for overcurrent protection in existing drawing-type wire-feed motor Flow sensor 922.Test section 923 is reached due to the current detection value I that detects based on the current sensor 9222Judged, Therefore welding system A4 does not need the new testing agency for having for detecting welding wire B.Therefore, the structure of each device can be inhibited multiple In addition hydridization can inhibit the increase of manufacturing cost.
And then according to the present embodiment, welding torch 3 ', can small-size light-weight due to the structure for not needing to have feeding welding wire B Change.
In addition, welding torch 3 ' can also have feeding portion 31, driving portion 321, current sensor 322 in the 4th embodiment And reach test section 323 (i.e. welding torch 3).In the case of such a construction, welding wire B is automatic in the feeding portion 31 of arrival welding torch 3 Before stopping, when welding wire B reaches the feeding portion 91 of drawing-type wire-feed motor 9, it can report and be automatically stopped in advance at once.Separately Outside, 2 can also be automatically stopped when welding wire B reaches the feeding portion 91 of drawing-type wire-feed motor 9 and reaches the feeding portion 31 of welding torch 3 It is secondary.
The case where welding wire B is fed in welding system A1~A4 is illustrated in above-mentioned 1st~4 embodiment, but not It is limited to this.The present invention can also be useful in the welding wire feeding system of the welding wire other than feeding welding wire B.Such as in thermal spray system The welding wire feeding system of feeding spraying coating line, the welding wire feeding system that cored solder wire is fed in soldering system, in such systems It can be with the present invention.
Welding wire feeding system according to the present invention and welding system are not limited to above-mentioned embodiment.The present invention The various design alterations of the specific structure in each portion of related welding wire feeding system and welding system are free.

Claims (10)

1. a kind of welding wire feeding system, which is characterized in that have:
1st feeding portion feeds welding wire；
2nd feeding portion, configuration have feed motor in the direction of feed side for more leaning on the welding wire than the 1st feeding portion, Welding wire described in swivel feeding by the feed motor；With
Control unit controls the 1st feeding portion and the 2nd feeding portion,
The control unit has:
Sensor, detection provide the rotation speed of electric signal or the feed motor to the feed motor；With
Test section is reached, the welding wire is detected based on the detected value that the sensor detects and reaches the 2nd feeding portion.
2. a kind of welding wire feeding system, which is characterized in that have:
1st feeding portion with feed motor, and passes through the swivel feeding welding wire of the feed motor；
2nd feeding portion configures in the direction of feed side for more leaning on the welding wire than the 1st feeding portion, feeds the welding wire；With
Control unit controls the 1st feeding portion and the 2nd feeding portion,
The control unit has:
Sensor, detection provide the electric signal for arriving the feed motor；With
Test section is reached, the welding wire is detected based on the detected value that the sensor detects and reaches the 2nd feeding portion.
3. welding wire feeding system according to claim 1 or 2, which is characterized in that
The arrival test section has:
The detected value is compared by comparing section with threshold value,
It is described to reach test section the comparison result in portion detects the arrival of the welding wire based on the comparison.
4. welding wire feeding system according to claim 1 or 2, which is characterized in that
The arrival test section has:
Calculation section calculates the differential value of the detected value；With
The differential value is compared by comparing section with threshold value,
It is described to reach test section the comparison result in portion detects the arrival of the welding wire based on the comparison.
5. welding wire feeding system according to claim 3 or 4, which is characterized in that
The instruction value for reaching the feed speed that test section corresponds to the welding wire makes the changes of threshold.
6. welding wire feeding system according to any one of claims 1 to 5, which is characterized in that
The electric signal is electric current.
7. welding wire feeding system described according to claim 1~any one of 6, which is characterized in that
The control unit makes the 1st feeding portion and described when the arrival test section detects the arrival of the welding wire 2nd feeding portion stops.
8. welding wire feeding system described according to claim 1~any one of 6, which is characterized in that
The control unit makes the 1st feeding portion and described when the arrival test section detects the arrival of the welding wire The feed speed of the welding wire in the 2nd feeding portion reduces, after the reduction of feed speed, when by given low velocity feeding Between when, stop the 1st feeding portion and the 2nd feeding portion.
9. a kind of welding system, which is characterized in that have:
Welding torch；
The welding supply of electric power is provided to the welding torch；With
The welding wire feeding system according to any one of claims 1 to 8 of the welding wire is fed to the welding torch.
10. welding system according to claim 9, which is characterized in that
The 2nd feeding portion is configured at the welding torch.
CN201811579379.0A 2018-03-15 2018-12-21 Wire feeding system and welding system Active CN110270740B (en)

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