CN110587094B - Automatic spot welding equipment for micro-resistance welding and intelligent spot welding equipment for micro-resistance welding - Google Patents
Automatic spot welding equipment for micro-resistance welding and intelligent spot welding equipment for micro-resistance welding Download PDFInfo
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- CN110587094B CN110587094B CN201910757386.3A CN201910757386A CN110587094B CN 110587094 B CN110587094 B CN 110587094B CN 201910757386 A CN201910757386 A CN 201910757386A CN 110587094 B CN110587094 B CN 110587094B
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/10—Spot welding; Stitch welding
- B23K11/11—Spot welding
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/25—Monitoring devices
- B23K11/252—Monitoring devices using digital means
- B23K11/255—Monitoring devices using digital means the measured parameter being a force
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/30—Features relating to electrodes
- B23K11/31—Electrode holders and actuating devices therefor
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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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/36—Auxiliary equipment
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Abstract
The invention discloses a micro-resistance welding automatic spot welding device, which comprises a micro-resistance welding spot welding device, an automatic spot welding operation table and an automatic control device, wherein the automatic spot welding operation table comprises a Y-axis sliding table arranged on an operation table bottom plate and an X-axis sliding table arranged above the Y-axis sliding table through a gantry support, a pulse output transformer is horizontally arranged on an automatic pulley of the X-axis sliding table, and an automatic spot welding machine head is arranged on the outer side of the automatic pulley beside the pulse output transformer in a suspension manner. The invention also provides a prepressing electrode force display circuit and an electrode force detection display circuit which are electrically connected on the spot welding head, and the spot welding head clamp is fixedly arranged at the lower end of the front sliding shaft and is arranged on the middle shaft extension shaft in a sliding way. In addition, the invention further discloses intelligent spot welding equipment for micro resistance welding on the basis of the automatic spot welding equipment for micro resistance welding.
Description
Technical Field
The invention belongs to the field of resistance welding spot welding and the field of automatic intelligent spot welding, and particularly relates to automatic spot welding equipment for micro-resistance welding and intelligent spot welding equipment for micro-resistance welding.
Background
In the related technology, the micro-resistance welding automatic spot welding equipment is characterized in that an automatic spot welding machine head is arranged on a pulley of an X-axis automatic sliding table, a spot welding machine host provided with a pulse transformer is arranged outside an automatic spot welding operation table, and the pulse output transformer on the spot welding machine host is electrically connected with a welding head clamp on the automatic spot welding machine head through two output cables, so that the two output cables are very long and are often more than 200 cm. Because the pulse output transformer installed in the main machine of the spot welding machine does not move along with the automatic spot welding machine head, great trouble is brought to the accuracy of automatic spot welding.
In addition, the existing automatic spot welding of micro resistance welding has the following defects: 1. the spot welding machine head is not provided with a device for detecting and correcting the pre-pressurizing electrode force, so that the pre-pressurizing electrode force cannot be accurate and consistent; 2. the welding head clamp is only fixed on one front sliding shaft, the parallelism and the stability are poor, and the tip of the welding head can easily slide on a weldment; 3. the spot welding machine head is provided with a movable component consisting of a middle shaft, a sliding shaft clamp and a front sliding shaft in a machine head frame, so that the movable stroke is small and the stability is poor.
In view of the above, there is a need for improvements in a spot welder head and a spot welder main body when providing a micro resistance welding automatic spot welding apparatus.
Disclosure of Invention
The invention aims to: overcomes the defects of the prior art and provides novel micro-resistance welding automatic spot welding equipment and micro-resistance welding intelligent welding equipment.
In order to achieve the above object, the present invention provides an automatic spot welding device for micro resistance welding, comprising a spot welding device for micro resistance welding, an automatic spot welding operation table, and an automatic spot welding control device, wherein the spot welding device for micro resistance welding comprises a spot welding machine main body, a pulse output transformer, a spot welding head, a welding head clamp, and a parallel electrode welding head mounted on the welding head clamp,
the automatic spot welding operation table comprises a working table bottom plate, a Y-axis sliding table arranged on the working table bottom plate, an X-axis sliding table arranged above the Y-axis sliding table through a gantry support, and a pulse output transformer and an automatic spot welding machine head arranged on the X-axis sliding table, wherein the pulse output transformer is horizontally arranged on an automatic pulley arranged on the X-axis sliding table, the automatic spot welding machine head is arranged on the outer side of the automatic pulley beside the pulse output transformer in a hanging manner, and the pulse transformer is electrically connected with a welding head clamp of the automatic spot welding machine head through an output cable; the automatic spot welding machine head is formed by assembling a spot welding machine head with a small cylinder, and a work fixture work piece table is arranged on an automatic pulley of the Y-axis sliding table;
spot welding machine host computer and automatic spot welding controlling means set up outside the automatic spot welding operation platform, pulse output transformer and spot welding machine head respectively with spot welding machine host computer electric connection, the driving motor of little cylinder, X axle slip table and Y axle slip table respectively with automatic spot welding controlling means electric connection.
As an improvement of the micro-resistance welding automatic spot welding equipment, the spot welding machine head comprises a machine head frame provided with a front sliding shaft and a central shaft, a welding head clamp used for installing a parallel electrode welding head is arranged at the lower end of the front sliding shaft, a compression spring used for pre-pressurizing electrode force is arranged on the central shaft, an electrode force detection display circuit and a preset electrode force display circuit are arranged on the machine head frame, the electrode force detection display circuit is electrically connected with the preset electrode force display circuit, and the display of detecting and correcting the preset electrode force is realized through an external pressure sensor.
As an improvement of the micro-resistance welding automatic spot welding equipment, a trimming resistor is arranged on the preset electrode force display circuit, and the display of the preset electrode force is corrected through the trimming resistor, so that the display of the preset electrode force is the same as the display of the electrode force detected by an external pressure sensor.
As an improvement of the micro-resistance welding automatic spot welding equipment, the lower end of the middle shaft is provided with an extension shaft, and the welding head clamp is respectively installed at the lower end of the front sliding shaft in a fastening mode and on the extension shaft of the middle shaft in a sliding mode.
As an improvement of the micro-resistance welding automatic spot welding equipment, the welding head clamp is respectively arranged at the lower end of the front sliding shaft in a fastening mode and is arranged on the middle shaft extension shaft in a sliding mode through a linear sliding bearing.
As an improvement of the automatic spot welding equipment for the micro resistance welding, the spot welding machine head comprises a groove-shaped rear seat provided with an upper end face and a lower end face, a machine head frame provided with a front sliding shaft and a middle shaft, a welding head clamp used for installing a parallel electrode welding head is arranged at the lower end of the front sliding shaft, two rear sliding shafts installed through linear sliding bearings are arranged on the machine head frame, the machine head frame is installed between the upper end face and the lower end face of the groove-shaped rear seat through the two rear sliding shafts, and the machine head frame can move up and down relative to the groove-shaped rear seat along the two rear sliding shafts as a movable member; the middle shaft is fixed on the frame of the machine head, and a compression spring used for pre-pressurizing the electrode force is arranged on the middle shaft.
As an improvement of the micro-resistance welding automatic spot welding equipment, the lower section of one of the two rear sliding shafts is provided with a return compression spring, and the lower section of the other rear sliding shaft is provided with a stroke limiting metal ring with a set screw.
In order to achieve the purpose, the invention also provides intelligent spot welding equipment for micro resistance welding, which comprises the automatic spot welding equipment for micro resistance welding, a single-cylinder microscope, a CCD camera and an industrial personal computer, wherein the single-cylinder microscope and the CCD camera are connected into a whole, and the industrial personal computer is electrically connected with the CCD camera and the automatic spot welding control device.
As an improvement of the intelligent spot welding equipment for the micro-resistance welding, the single-tube microscope connected with the CCD camera into a whole is arranged on an automatic pulley of the X-axis sliding table, can be translated together with the welding head clamp, and can clearly focus a welding disc of a welded workpiece.
Technical effects of the invention
Compared with the prior art, the automatic spot welding equipment for the micro-resistance welding and the intelligent spot welding equipment for the micro-resistance welding have the following advantages:
1. the invention lists pulse output transformers from a spot welding machine main body independently, and provides a structure of an automatic spot welding operation table. According to the automatic spot welding machine head, the pulse output transformer is horizontally arranged on the automatic pulley of the X-axis sliding table, the automatic spot welding machine head is arranged on the outer side of the automatic pulley beside the pulse output transformer in a hanging mode, so that an output cable for connecting the pulse transformer and a welding head clamp of the automatic spot welding machine head is greatly shortened, and the pulse output transformer moves along with the automatic spot welding machine head, so that the stability of output current and the accuracy of automatic spot welding operation can be effectively improved.
2. The electrode force detection display circuit is added on the basis that the preset electrode force display circuit is erected on the machine head frame, the electrode force detection display circuit is electrically connected with the preset electrode force display circuit, the display of the preset electrode force can be detected and corrected at any time as long as the external pressure sensor is connected, and the accuracy and consistency of the displayed electrode force of the micro-resistance welding spot welding machine head are ensured.
3. The middle shaft of the micro-resistance welding spot welding head is provided with an extension shaft, and the welding head clamp is arranged at the lower end of the front sliding shaft in a fastening mode and is arranged on the middle shaft extension shaft in a sliding mode through the linear sliding bearing, so that the stability and the parallelism of the installation of the welding head clamp can be effectively improved.
4. Two rear sliding shafts are mounted on the frame of machine head by means of linear sliding bearings and between upper and lower end faces of groove-shaped rear seat, so that the frame of machine head is changed into moving member, and its central shaft is fixed and does not participate in movement. The structure of the limiting metal ring is arranged on the rear sliding shaft of the groove-shaped rear seat, so that the moving stroke of the machine head frame can be increased or changed easily. In addition, the center shaft is fixed, so that the consistency of the preset electrode force on the parallel electrode welding head can be ensured.
5. The invention provides a mechanical structure of intelligent spot welding equipment for micro-resistance welding on the basis of automatic spot welding equipment for micro-resistance welding.
Drawings
The invention relates to a micro-resistance welding automatic spot welding device and a micro-resistance welding intelligent spot welding device, which are explained in detail with reference to the attached drawings and the specific implementation mode, wherein:
FIG. 1 is a block diagram showing the construction of an automatic spot welding apparatus for micro resistance welding according to the present invention.
Fig. 2 is a schematic structural view of the stitch welding operation table of the present invention.
Fig. 3 is a schematic structural view of a spot welder head and a welding head clamp according to the present invention.
Fig. 4 is a block diagram of the structure of the intelligent spot welding equipment for micro resistance welding of the invention.
Detailed Description
In order to make the objects, technical solutions and technical effects of the present invention more clear, the present invention will be further described in detail with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, fig. 1 is a block diagram of a micro resistance welding automatic spot welding device, and fig. 2 is a schematic structural diagram of an automatic spot welding operation table. The invention relates to a micro resistance welding automatic spot welding device, which comprises: a micro resistance spot welding device 100, a stitch welding work table 200, and a stitch welding control device 300; the micro resistance welding spot welding apparatus 100 includes a spot welder main body 101, a pulse output transformer 102, a spot welder head 103, a welding head holder 104, and a parallel electrode welding head 105 mounted on the welding head holder.
The automatic spot welding workbench 200 comprises a workbench bottom plate 201, a Y-axis sliding table 202 installed on the workbench bottom plate, an X-axis sliding table 204 installed above the Y-axis sliding table 202 through a gantry support 203, a pulse output transformer 102 installed on the X-axis sliding table 204 and an automatic spot welding machine head 206; the pulse output transformer 102 is horizontally installed on an automatic pulley of the X-axis sliding table 204, the automatic spot welding machine head 206 is installed on the outer side of the automatic pulley beside the pulse output transformer 102 in a hanging mode, and the pulse transformer 102 is electrically connected with a welding head clamp 104 of the automatic spot welding machine head 206 through an output cable; the automatic spot welding head 206 is formed by assembling a small cylinder 205 through the spot welding head 103, and the Y-axis sliding table 202 is provided with a work fixture work piece table 207.
The spot welding machine main body 101 and the automatic spot welding control device 300 are arranged outside the automatic spot welding operation table 200, the pulse output transformer 102 and the spot welding machine head 103 are respectively and electrically connected with the spot welding machine main body 101, and the driving motors of the small cylinder 205, the X-axis sliding table 204 and the Y-axis sliding table 202 are respectively and electrically connected with the automatic spot welding control device 300.
The automatic spot welding control device 300 and the spot welding machine main body 101 are both arranged outside the automatic spot welding operation table 200 in a box structure, wherein the automatic spot welding control device 300 is provided with a drive control device of driving motors of the X-axis sliding table 204 and the Y-axis sliding table 202, drive control of a small cylinder, and programming control of various kinds of software. The automatic spot welding control device 300 is electrically connected with the small cylinder 205, the X-axis sliding table 204 and the driving motor of the Y-axis sliding table 202, and a work fixture work piece table 207 for installing a work piece to be welded is arranged on the automatic sliding table vehicle of the Y-axis sliding table 202. For example, the movement of the X-axis slide 204, the Y-axis slide 202 and the stitch welder head 206 on the stitch welding operation table 200 can be controlled by the general PLC software programming, so as to realize the stitch welding operation for the welded workpiece.
A main circuit for controlling output pulses, a power transformer, a large capacitor and the like are arranged in a case of the spot welding machine main machine 101. The pulse output transformer 102 and the spot welding head 103 are electrically connected with the spot welding machine main body 101, and when the electrode force applied to the parallel electrode welding head 105 reaches a preset value, the spot welding machine head 103 can send out an electric signal to trigger the spot welding machine main body 101, so that pulse output current is provided for the parallel electrode welding head 105 to realize welding.
The improved structure of the spot welder head 103 of the micro resistance welding automatic spot welding equipment comprises the following components: the handpiece frame 304 is provided with an electrode force detection display circuit and a preset electrode force display circuit which are electrically connected with each other, and the display of detecting and correcting the preset electrode force is realized by the external pressure sensor 320; the weld head clamp 104 is mounted on the middle shaft extension shaft 315 in a sliding manner in addition to being mounted on the lower end of the front sliding shaft 305 in a fastening manner; the head frame 304 is changed to the contents of three parts of the movable member of the spot welder head 103.
Referring to fig. 3, the spot welding machine head 103 includes a machine head frame 304 having a front sliding shaft 305 and a central shaft 306, a welding head clamp 104 disposed at the lower end of the front sliding shaft 305 and used for mounting a parallel electrode welding head 105, and a compression spring 308A disposed at the central shaft 306 and used for pre-pressurizing an electrode force and a lower compression spring 308B for increasing the electrode force following property, wherein the machine head frame 304 is provided with an electrode force detection display circuit and a preset electrode force display circuit for detecting and correcting the preset electrode force through an external pressure sensor 320, the electrode force detection display circuit is electrically connected with the preset electrode force display circuit, and the display for detecting and correcting the preset electrode force is realized through the external pressure sensor 320.
In one embodiment of the present invention, a trimming resistor is provided on the preset electrode force display circuit, and the display of the preset electrode force is corrected by the trimming resistor to be the same as the display of the electrode force detected by the external pressure sensor.
As shown in fig. 3, a preset electrode force display circuit is disposed on the front outer groove 316 of the handpiece frame 304, an upper compression spring 308A for pre-pressurizing the electrode force and a lower compression spring 308B for increasing the electrode force followability are mounted on the central shaft 306, a slide shaft clamp 309 is mounted between the upper compression spring 308A and the lower compression spring 308B, and the slide shaft clamp 309 is clamped on the front slide shaft 305. So configured, the pre-set electrode force of the upper compression spring 308A can be applied to the front slide shaft 305 via the slide shaft clamp 309.
It should be noted that the structure of the front sliding shaft 305, the sliding shaft clamp 309, and the upper and lower compression springs 308A,308B mounted on the central shaft 306 may be referred to as an "electrode force following structure", which can ensure that the provided electrode force is very soft, and through detection, the electrode force provided by the structure is at least 0.1N, and the preset electrode force can be increased or decreased with the accuracy of 0.1N.
In order to detect and correct the electrode force preset by the compression spring, a preset electrode force display circuit and an electrode force detection display circuit for detecting the preset electrode force through an external pressure sensor are arranged on the spot welding head 103, and the preset electrode force display circuit is electrically connected with the electrode force detection display circuit. As shown in fig. 3, the front outer side of the head frame 304 of the spot welding head 103 is provided with a groove 316 for mounting a preset electrode force display circuit and an electrode force detection display circuit, which are electrically connected. When the preset electrode force needs to be detected and corrected, the electrode force of the preset electrode force at the moment of triggering the welding current can be detected only by externally connecting the pressure sensor 320 and electrically connecting the electrode force detection display circuit through the electric signal outgoing line 324 of the pressure sensor.
Referring to fig. 3, the external pressure sensor has a measuring range of 5KG and a size of about 30x 15x 15mm (length x width x height), the pressure sensor 320 has a fixed end 321 and a force measuring end 322, a dumbbell-shaped deformation frame 323 is arranged in the middle of the pressure sensor 320, a pressure sensing sheet is mounted on the deformation frame 323, and an electrical signal generated by the pressure sensing sheet when the deformation frame 323 deforms can be led out through an electrical signal outgoing line 324.
In the illustrated embodiment, the fixed end 321 circumscribing the pressure sensor 320 is mounted on the housing of the pressure sensor 320, and the load end 322 of the pressure sensor 320 is suspended. When the preset electrode force needs to be detected and corrected, only the electric signal lead-out wire 324 of the external pressure sensor 320 is electrically connected with the electrode force detection display circuit through the electric socket, and the parallel electrode welding head 105 is installed on the welding head clamp 104 or an electrode force pressurizing rod like the welding head is installed on the welding head clamp 104, so that the force measuring end 322 of the pressure sensor 320 is pressurized by the parallel electrode welding head 105 or the electrode force pressurizing rod. When the pressurized force reaches the preset electrode force, the electrode force detection display circuit is electrically connected with the preset electrode force display circuit, so that the electrode force detection display circuit can read the electrode force of the electrode force at the moment when the power supply is switched on.
The preset electrode force display circuit, the electrode force detection display circuit, the preset electrode force display circuit and the electrode force detection display circuit are electrically connected, and the structure and the working principle of the external pressure sensor are further described respectively.
Firstly, presetting the structure of an electrode force display circuit to connect the compressed stroke of a compression spring with the stroke of a sliding resistor; the resistance value of the sliding resistor is changed at the same time when the compression stroke of the spring is changed, and the change of the resistance value realizes that the size of the electrode force of the compression amount of the spring is displayed by a digital display tube through an A/D conversion circuit. Because the change of the spring compression amount and the compression force is not linear, but the change of the stroke of the sliding resistor and the change of the resistance value are linear, the force displayed by the preset electrode force display circuit inevitably has inevitable errors, and the resistance welding spot welding head in the prior art has no structure for detecting and correcting the display of the preset electrode force.
Next, it should be noted that the principle of the electrode force detection display circuit of this embodiment is substantially the same as that of the detection display circuit of the commercially available electronic scale of the pressure sensor, as shown in fig. 3, when the pressure sensor 320 is stressed, the deformation frame 323 generates a deformation to generate a potential difference, the change of the potential difference is detected by the pressure sensing sheet tightly attached to the deformation frame 323 and is led out by the wire 324, and the precise electrode force displayed by a digital code can be obtained by a/D conversion on the circuit.
And thirdly, the electrode force displayed by the preset electrode force display circuit is substantially an indication for triggering the welding power supply, and when the electrode force applied to the weldment by the welding head reaches the display value of the preset electrode force, the preset electrode force display circuit sends an electric signal to trigger the welding power supply. In the embodiment, the welding head or the electrode force pressurizing rod is arranged on the welding head clamp 104 to replace the force measuring end 322 of the externally connected pressure sensor 320, so that the magnitude of the electrode force can be detected, and the magnitude of the electrode force is completely the same as the electrode force applied to the weldment by the welding head for welding. Because the electrode force detection display circuit is electrically connected with the preset electrode force display circuit, the electrode force applied to the weldment for welding can be used as the peak value of the electrode force detection display circuit, and when the force of the force measuring end of the external pressure sensor reaches the peak value, the electric signal of the welding power supply is triggered and simultaneously transmitted to the pressure sensor detection display circuit, and the digital display is converted. In other words, the electrode force detection display circuit of the present embodiment detects only the electrode force (i.e., the peak value) applied to the weldment for welding by the external pressure sensor, and corrects the display of the preset electrode force accordingly.
This embodiment is equipped with the digital display screen of presetting electrode strength display circuit and the digital display screen of electrode strength detection display circuit simultaneously on aircraft nose frame 304, the electrode strength that shows presetting electrode strength display circuit and demonstration electrode strength detection display circuit external pressure sensor actual measurement when presetting electrode strength respectively, be provided with trimming resistor simultaneously on presetting electrode strength display circuit, through trimming resistor the demonstration correction of presetting electrode strength, it is the same with the electrode strength display that external pressure sensor detected to make it.
It should be noted that after the work of detecting and correcting the preset electrode force is completed, the external pressure sensor 320 needs to be removed, and the electric signal lead-out wire 324 on the electric socket is removed to perform the micro resistance welding spot welding work.
With continued reference to fig. 3, the lower end of the middle shaft 306 is provided with a middle shaft extension shaft 315, and the welding head clamp 104 is respectively and tightly mounted on the lower end of the front sliding shaft 305 of the head frame 304 and slidably mounted on the middle shaft extension shaft 315. According to a preferred embodiment of the present invention, the weld head holder 104 is fixedly mounted on the lower end of the front slide shaft 305 of the head frame 304 and slidably mounted on the middle shaft extension shaft 315 through linear slide bearings, respectively. The spot welder head of the invention proposes that a middle shaft extension shaft 315 is arranged at the lower end of a middle shaft 306, and the welding head clamp 104 is arranged at the lower end of a front sliding shaft 305 in a fastening mode and is also arranged on the middle shaft extension shaft 315 in a sliding mode through a linear sliding bearing, so that the mounting stability and parallelism of the welding head clamp 104 can be well improved, and the slippage of the tip of a welding head on a weldment during welding can be effectively eliminated.
The head frame of the spot welding head in the prior art is a fixed support, the head frame is used for installing moving components including a front sliding shaft, a middle shaft and the like, the middle shaft is a moving component, and a pre-pressurizing preset electrode force structure and an electrode force following structure are arranged on the middle shaft, so that the provided electrode force is easy to be unstable, and meanwhile, the moving strokes of the front sliding shaft and the middle shaft are limited by the head frame and generally exceed 20 mm. In addition, because the welding head clamp is arranged at the lower end of the front sliding shaft, and the parallel electrode welding head is arranged on the welding head clamp, the moving stroke of the parallel electrode welding head is limited by the frame of the welding head, and the moving stroke of the parallel electrode welding head is too short to meet the requirements of some workpieces with long required strokes.
Referring to fig. 3, the spot welder head 103 includes a groove-shaped rear seat 303 having upper and lower end surfaces 311A,311B, a head frame 304 is provided with two rear slide shafts 307A,307B mounted through linear slide bearings, the head frame 304 is mounted between the upper and lower end surfaces 311A,311B of the groove-shaped rear seat 303 through the two rear slide shafts 307A,307B, and the head frame 304 is movable up and down relative to the groove-shaped rear seat 303 along the two rear slide shafts 311A, 311B. So configured, the head frame 304 becomes a moving member of the spot welder head 103. In addition, in the present embodiment, the middle shaft 306 is fixed on the handpiece frame 304 by the fastening screw, the middle shaft 306 is no longer a moving component, and the front sliding shaft 305 of the sliding shaft clamp 309 can still make a small range of displacement between the upper and lower compression springs 308A, 308B.
So arranged, the head frame 304 is movable up and down relative to the slotted backseat 303 along two rear slide axes 307A, 307B. When welding operation is carried out, as long as a welding acting force and a resetting force are added, the machine head frame 304 is used as a movable component of the spot welding machine head 103, the welding head clamp 104 can be driven to carry out resistance welding spot welding operation of reciprocating movement within the range of the groove-shaped rear seat 303, and the central shaft 306 is fixed, so that the consistency of electrode force can be ensured.
Referring to fig. 3, a pedal cable 312 for providing a welding force to the head frame 304 through a pedal is installed between the two rear sliding shafts 307A,307B, a lower end of the head frame 304 is connected to the cable 312, the two rear sliding shafts 307A,307B are installed on a lower end surface of the groove-shaped rear seat 303, a return compression spring 313 is installed on one rear sliding shaft 307B near the outer side, a stroke limiting metal ring 314 with an adjustable screw is installed on one rear sliding shaft 307A near the inner side, and the installation position of the limiting metal ring 314 on the rear sliding shaft 307A is adjusted through the adjustable screw, so that the moving stroke of the head frame 304 on the groove-shaped rear seat 303 can be increased or decreased.
The machine head frame 304 is used as a moving component of the spot welding machine head 103, so that the mounting stability of the spot welding machine head 103 can be increased, the consistency of the provided electrode force is ensured, and the adjustment of the movable stroke of the parallel electrode welding head through the machine head frame 304 is facilitated. Through testing, the moving stroke of the parallel electrode welding head can be increased to more than 50mm by driving the welding head clamp 104 by the machine head frame 304.
Fig. 4 is a block diagram of a structure of the intelligent spot welding equipment for micro resistance welding according to the present invention, the intelligent spot welding equipment for micro resistance welding is based on the automatic spot welding equipment for micro resistance welding, a single-cylinder microscope 401 is arranged near an automatic pulley of an X-axis sliding table 204 adjacent to a welding head clamp 104, the single-cylinder microscope 401 and a CCD camera 402 are integrally installed, an industrial personal computer 400 is further arranged outside an automatic spot welding operation table 200, the industrial personal computer 400 is provided with an image recognition vision system and logic processing software, and the industrial personal computer 400 is electrically connected with the CCD camera 402 and an automatic spot welding control device 300. Because the single-tube microscope 401 provided with the CCD camera 402 can make translational motion with the welding head clamp 104 and can clearly focus and image the welding pad of the welded workpiece, the industrial personal computer 400 can perform visual analysis and logic processing on the image imaged by the welding pad and send an instruction to the automatic spot welding control device 300 to respectively control the automatic spot welding operation of the automatic spot welding head 206, the X-axis sliding table 204 and the Y-axis sliding table 202, and the intelligent spot welding operation controlled by image recognition vision is realized.
Compared with the prior art, the micro-resistance welding automatic spot welding equipment and the micro-resistance welding intelligent spot welding equipment have the technical effects that:
1. the invention lists pulse output transformers from a spot welding machine main body independently, and provides a structure of an automatic spot welding operation table, which comprises a Y-axis sliding table installed on a bottom plate of the operation table, an X-axis sliding table installed above the Y-axis sliding table through a gantry support, and a pulse output transformer and an automatic spot welding machine head installed on the X-axis sliding table.
2. The electrode force detection display circuit is added on the basis that the preset electrode force display circuit is erected on the machine head frame, the electrode force detection display circuit is electrically connected with the preset electrode force display circuit, the display of the preset electrode force can be detected and corrected at any time as long as the external pressure sensor is connected, and the accuracy and consistency of the displayed electrode force of the micro-resistance welding spot welding machine head are ensured.
3. The middle shaft of the micro-resistance welding spot welding head is provided with an extension shaft, and the welding head clamp is arranged at the lower end of the front sliding shaft in a fastening mode and is arranged on the middle shaft extension shaft in a sliding mode through the linear sliding bearing, so that the stability and the parallelism of the installation of the welding head clamp can be effectively improved.
4. The machine head frame of the micro-resistance welding spot welding machine head in the prior art is a fixed support, the machine head frame is used for installing moving components comprising a front sliding shaft, a middle shaft and the like, and because the middle shaft is a moving component and is provided with a pre-pressurizing preset electrode force structure and an electrode force following structure, the electrode force on a parallel electrode welding head is easy to be unstable, and meanwhile, the moving stroke of the front sliding shaft and the middle shaft is limited by the machine head frame and cannot meet the requirements of some workpieces with long required stroke due to too short stroke. In the embodiment, two rear sliding shafts are arranged on the frame of the machine head through linear sliding bearings and are arranged between the upper end surface and the lower end surface of the groove-shaped rear seat, so that the frame of the machine head is changed into a moving component, and meanwhile, the middle shaft is fixed and does not participate in movement. The central shaft is fixed, so that the consistency of preset electrode force on the parallel electrode welding head can be ensured.
5. The invention provides a mechanical structure of intelligent spot welding equipment for micro-resistance welding on the basis of automatic spot welding equipment for micro-resistance welding.
Appropriate changes and modifications to the embodiments described above will become apparent to those skilled in the art from the disclosure and teachings of the foregoing description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (8)
1. An automatic spot welding device for micro resistance welding comprises a spot welding device for micro resistance welding, an automatic spot welding operation table and an automatic spot welding control device, wherein the spot welding device for micro resistance welding comprises a spot welding machine main machine, a pulse output transformer, a spot welding machine head, a welding head clamp and a parallel electrode welding head arranged on the welding head clamp,
the spot welding machine head comprises a groove-shaped rear seat provided with an upper end face and a lower end face, a machine head frame provided with a front sliding shaft and a middle shaft, a welding head clamp used for mounting a parallel electrode welding head is arranged at the lower end of the front sliding shaft, two rear sliding shafts mounted through linear sliding bearings are arranged on the machine head frame, the machine head frame is mounted between the upper end face and the lower end face of the groove-shaped rear seat through the two rear sliding shafts, and the machine head frame can move up and down relative to the groove-shaped rear seat along the two rear sliding shafts as a movable member; the middle shaft is fixed on the machine head frame, and a compression spring used for pre-pressurizing the electrode force is arranged on the middle shaft;
the automatic spot welding operation table comprises a workbench bottom plate, a Y-axis sliding table arranged on the workbench bottom plate, an X-axis sliding table arranged above the Y-axis sliding table through a gantry support, and a pulse output transformer and an automatic spot welding machine head which are arranged on the X-axis sliding table; the automatic spot welding machine head is arranged on the outer side of the automatic pulley in a hanging manner beside the pulse output transformer, and the pulse transformer is electrically connected with a welding head clamp of the automatic spot welding machine head through an output cable; the automatic spot welding machine head is formed by assembling a spot welding machine head with a small cylinder, and a work fixture work piece table is arranged on an automatic pulley of the Y-axis sliding table;
spot welding machine host computer and automatic spot welding controlling means set up outside the automatic spot welding operation platform, pulse output transformer and spot welding machine head respectively with spot welding machine host computer electric connection, the driving motor of little cylinder, X axle slip table and Y axle slip table respectively with automatic spot welding controlling means electric connection.
2. A micro-resistance welding automatic spot welding device according to claim 1, wherein the spot welding machine head comprises a machine head frame provided with a front sliding shaft and a central shaft, a welding head clamp for installing a parallel electrode welding head is arranged at the lower end of the front sliding shaft, a compression spring for pre-pressurizing the electrode force is arranged on the central shaft, an electrode force detection display circuit and a preset electrode force display circuit are arranged on the machine head frame, the electrode force detection display circuit is electrically connected with the preset electrode force display circuit, and the display of the detection correction preset electrode force is realized through an external pressure sensor.
3. A micro-resistance welding automatic spot welding device according to claim 2, wherein a trimming resistor is provided on the preset electrode force display circuit, and the display of the preset electrode force is corrected by the trimming resistor to be the same as the display of the electrode force detected by the external pressure sensor.
4. A micro-resistance welding automatic spot welding device according to claim 2, wherein the lower end of the center shaft is provided with an extension shaft, and the welding head holder is fixedly mounted on the lower end of the front slide shaft and slidably mounted on the center shaft extension shaft, respectively.
5. A micro-resistance welding automatic spot welding device according to claim 4, wherein said tip holder is fixedly mounted on a lower end of the front slide shaft and slidably mounted on the middle shaft extension shaft through linear slide bearings, respectively.
6. A micro-resistance welding automatic spot welding device according to claim 1, wherein the lower section of one of the two rear sliding shafts is provided with a return compression spring, and the lower section of the other rear sliding shaft is provided with a stroke limiting metal ring with a set screw.
7. An intelligent micro-resistance welding spot welding device is characterized by comprising the micro-resistance welding automatic spot welding device as claimed in any one of claims 1 to 6, a single-cylinder microscope, a CCD camera and an industrial personal computer, wherein the single-cylinder microscope and the CCD camera are connected into a whole, and the industrial personal computer is electrically connected with the CCD camera and the automatic spot welding control device.
8. The intelligent spot welding equipment for micro-resistance welding according to claim 7, wherein the single-tube microscope connected with the CCD camera into a whole is arranged on an automatic pulley of the X-axis sliding table, and can translate together with the welding head clamp and clearly focus the welding pad of the welded workpiece.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910757386.3A CN110587094B (en) | 2019-08-16 | 2019-08-16 | Automatic spot welding equipment for micro-resistance welding and intelligent spot welding equipment for micro-resistance welding |
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| CN201910757386.3A CN110587094B (en) | 2019-08-16 | 2019-08-16 | Automatic spot welding equipment for micro-resistance welding and intelligent spot welding equipment for micro-resistance welding |
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| CN113414482B (en) * | 2021-06-15 | 2023-05-16 | 中国第一汽车股份有限公司 | Device and method for detecting position compensation function of spot welding electrode of robot |
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