WO2016115712A1 - 电极力检测装置和带电极力检测装置的点焊机头 - Google Patents

电极力检测装置和带电极力检测装置的点焊机头 Download PDF

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Publication number
WO2016115712A1
WO2016115712A1 PCT/CN2015/071359 CN2015071359W WO2016115712A1 WO 2016115712 A1 WO2016115712 A1 WO 2016115712A1 CN 2015071359 W CN2015071359 W CN 2015071359W WO 2016115712 A1 WO2016115712 A1 WO 2016115712A1
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Prior art keywords
electrode
pressure sensing
welding head
head
force
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PCT/CN2015/071359
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English (en)
French (fr)
Inventor
杨仕桐
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广州微点焊设备有限公司
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Priority to PCT/CN2015/071359 priority Critical patent/WO2016115712A1/zh
Publication of WO2016115712A1 publication Critical patent/WO2016115712A1/zh

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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

Definitions

  • the present invention relates to the field of electric resistance welding, and more particularly to the detection of electric resistance of electric resistance spot welding.
  • the spot welding machine head In order to maintain the electrode force during the spot welding of the resistance welding, the spot welding machine head has an electrode force pre-setting structure, and the electrode force is generally preset by the compression spring. When the electrode force reaches a preset value, the electrode force is pre-set.
  • the electrode force pre-setting circuit of the set structure triggers the host to provide the welding power source. In order to ensure the consistency and stability of the welding, especially when welding fine workpieces, the welding of the electrode force of the spot welding head must be detected and corrected.
  • the method for detecting and correcting the electrode force of the spot welding machine head is realized by using an electronic scale as follows: First, an electronic book of a book is placed at the lower end of the welding head clip, and then the pressure bar is installed at The welding head clamp is pressed on the pressure sensing block of the electronic scale by a pressure rod to obtain a reading of the electrode force. It can be seen that with the prior art detection method, if the position of the weldment at the lower end of the weld head clamp cannot be placed, the detection and correction cannot be performed.
  • the object of the present invention is to provide an electrode force detecting device that is not affected by the position of the weldment, and to provide a spot welding capable of detecting the electrode force during the welding period in real time on the basis of the electrode force detecting device.
  • the nose is to provide an electrode force detecting device that is not affected by the position of the weldment, and to provide a spot welding capable of detecting the electrode force during the welding period in real time on the basis of the electrode force detecting device.
  • the present invention provides an electrode force detecting device including a pressure sensing block, a pressure bar and a pressure sensing display circuit;
  • the pressure sensing block includes a fixed end and a force measuring end, and the fixed end thereof
  • the welding head clamp mounted on the spot welding machine head is connected to the lower end of the shaft;
  • the pressure rod is mounted on the measuring end of the pressure sensing block, and the pressure sensing display circuit is electrically connected to the pressure sensing block.
  • the pressure sensing display circuit is further electrically connected to an electrode force presetting circuit of the electrode force presetting structure on the spot welding head.
  • the electrode force detecting device of the present invention mounts the fixed end of the pressure sensing block on the welding head clamp connecting shaft of the spot welding machine head, and the pressure rod Installed on the force measuring end of the pressure sensing block, the pressure sensing display circuit is electrically connected to the pressure sensing block and the electrode force presetting circuit at the same time, so that the electronic weighing is suspended above the welding member, so the electrode of the invention
  • the force detecting device has a technological advancement that is not affected by the spatial position of the weldment and is more precise.
  • the present invention also provides a spot welding machine head with an electrode force detecting device, comprising an electrode force detecting device, a spot welding head and a welding head holder;
  • the spot welding machine head includes a head frame The electrode force presetting structure and the welding head clip connecting shaft mounted on the head frame;
  • the electrode force detecting device comprises a pressure sensing block and a pressure sensing display circuit, wherein the pressure sensing block comprises a fixed end and a force measuring end, The fixed end is mounted on the welding head clip connecting shaft; the welding head clip is mounted on the measuring end of the pressure sensing block, and the pressure sensing block is electrically connected to the pressure sensing display circuit.
  • the electrode force presetting structure has an electrode force presetting circuit, and the electrode force presetting circuit and the pressure sensing display circuit are electrically connected.
  • the welding head holder comprises two electrode holders of a fixed electrode holder and a movable electrode holder; and the fixed electrode holder is fastened to the pressure sensing block.
  • the movable electrode holder is connected to the fixed electrode holder by a tension adjusting structure to form a welding head clip.
  • the lower end of the two electrode holders of the welding head holder is provided with an electrode interface for mounting the electrode welding head, and the upper ends of the two electrode holders are provided with A screw that is connected to the spot welding power output cable.
  • the elastic adjusting structure comprises an insulating pin, an adjusting screw, an insulating spacer and a compression spring; and the insulating pin slidably connects the movable electrode holder Fixing one side of the electrode clamping block; the end of the adjusting screw passes through the movable electrode clamping block and is screwed into the corresponding screw hole of the fixed electrode clamping block, and the insulating spacer is spaced between the adjusting screw and the movable electrode clamping block to make the two Maintaining insulation, the compression spring provides the movable electrode holder with a pushing force away from the fixed electrode holder.
  • an electrode welding head is mounted on the welding head holder, and the electrode welding head simultaneously functions as an electrode force of the electrode force detecting device pressure bar.
  • the present invention provides a spot welding head with an electrode force detecting device based on the electrode force detecting device, which mounts the welding head clip on the force measuring end of the pressure sensing block, and the pressure sensing display
  • the circuit is installed on the spot welding machine head or the spot welding machine, and the pressure sensing display circuit is electrically connected with the pressure sensing block and the electrode force presetting circuit, and the electrode welding head mounted on the welding head clip is simultaneously a pressure rod, so that the electrode
  • the force detecting device and the spot welding head are integrated structures, and the present invention solves the technical problem that the electrode welding field has not been able to detect the electrode force in the welding period for a long time.
  • FIG. 1 is a schematic view showing the structure of an electrode force detecting device of the present invention.
  • FIG. 2 is a schematic view showing the structure of an electrode force detecting device of the present invention mounted on a spot welding machine head.
  • FIG. 3 is a schematic view showing the structure of a spot welding head with an electrode force detecting device according to the present invention.
  • FIG. 4 is a structural schematic view of the welding head clip of FIG. 3 installed at the force measuring end of the pressure sensing block.
  • the pressure sensor mentioned in the industry includes a pressure sensing block and a pressure sensing display circuit.
  • the most commonly used pressure sensing block is a pressure sensing block with a deformed cavity, and the pressure sensing block and the pressure sensing display circuit are integrated. Can be called electronic scale.
  • the invention comprises two parts of an electrode force detecting device and a spot welding head with an electrode force detecting device.
  • the spot welding machine head generally includes the head frame.
  • the welding force transmission structure, the electrode force pre-setting structure and the welding force conduction are installed on the machine frame.
  • the structure includes a welding head clip connecting shaft, a lower end for mounting the welding head clip, an electrode welding head mounted on the welding head clip, and an electrode force pre-setting structure including an electrode force presetting circuit, and an electrode on the electrode welding head At the instant when the force reaches the preset value, the welding power source is turned on by the electrode force presetting circuit to supply the welding current to the electrode horn.
  • the electrode force detecting device of the present invention includes a pressure sensing block 101, a pressure bar 102, and a pressure sensing display circuit 103.
  • the two ends of the pressure sensing block 101 are respectively a fixed end 104 and a measuring end 105; the fixed end 104 is provided with a mounting interface 111, and the pressure sensing block 101 can be mounted on the welding head of the spot welding head 106 through the mounting interface 111.
  • the lower end of the shaft 107 is coupled.
  • the pressure bar 102 is a cylindrical small metal bar that is mounted on the force measuring end 105 of the pressure sensing block 101 for transmitting the force to the pressure sensing block 101.
  • the pressure sensing display circuit 103 is electrically connected to the pressure sensing block 101 through the power line 108, and is also electrically connected through the power line 110 and the electrode force presetting circuit 109 of the electrode force presetting structure on the spot welding machine head.
  • the fixed end 104 of the pressure sensing block 101 is connected to the horn clip connecting shaft 107 through the mounting interface 111 for easy detachable connection, and the electrical connection between the electrode force presetting circuit 109 and the pressure sensing display circuit 103 is also For easy-to-assemble connector connections, the connection of the force measuring end 105 of the pressure sensing block 101 to the pressure bar 102 is a connection that facilitates adjustment of the pressure level of the pressure bar 102.
  • the method for mounting the electrode force detecting device of the present invention on a spot welding machine head and the working principle thereof are as follows: first, the original welding head clamp is removed, and the fixed end 104 of the pressure sensing block 101 is mounted on the welding head of the spot welding machine head. On the clamp connecting shaft 107, the pressure rod 102 is mounted on the force measuring end 105 of the pressure sensing block 101; then, the spot welding head is adjusted to the working state, and the electrode force is preset on the spot welding head, The pressure bar 102 is pressurized by the welding force transmission structure of the spot welding head.
  • the electrode force detected by the pressure sensor is also the preset electrode force. Due to the accuracy of the pressure sensor, it can be used to detect and correct the preset electrode force.
  • the electrode force detection and correction are performed by placing the electronic scale under the welding head clamp, and after the pressure rod is mounted on the welding head clamp, the pressure sensing block of the electronic weighing is pressed, when the pre-reading is heard.
  • the electrode force circuit is configured to instantaneously read the electronic pressure reading of the horn sound that triggers the welding power source.
  • the prior art method for detecting the electrode force is subject to the space and position of the weldment under the welding head clamp. If the position is insufficient to place the electronic scale, the detection cannot be performed; second, when the preset electrode is heard The force circuit emits a horn sound that triggers the welding power source and then reads the pressure reading of the electronic scale.
  • the present invention mounts the pressure sensing block directly on the welding head clamp connecting shaft, and presses the pressure rod on the welding member or the workpiece table.
  • the pressure sensing display The circuit and the electrode force pre-setting circuit are electrically connected, and the instantaneous electrode force displayed by the pressure sensing display circuit is a preset electrode force, which is very direct and accurate, and completely avoids errors caused by time difference and other factors.
  • the pressure sensing block is mounted on the welding head clamp connecting shaft, the electronic weighing is suspended above the welding member, so that the electrode force detecting device of the present invention is completely unaffected by the position of the welding member.
  • the spot welding head of the present invention with an electrode force detecting device includes a spot welding head, an electrode force detecting device, a welding head holder 303, and an electrode welding head 304.
  • the spot welding machine head comprises a head frame 301, a nose column 302 and a welding force transmission structure and an electrode force presetting structure mounted on the head frame 301;
  • the welding force transmission structure has a welding head clip connecting shaft 107A, and the electrode force is pre-
  • the setting structure has an electrode force presetting circuit 109A.
  • the electrode force detecting device includes a pressure sensing block 101A and a pressure sensing display circuit (not shown).
  • the fixed end 104A of the pressure sensing block 101A is mounted at the lower end of the horn clip connecting shaft 107A, and the horn clip 303 is attached to the force measuring end 105A of the pressure sensing block 101A.
  • the pressure sensing display circuit is mounted on the spot welder head or mounted on the spot welder.
  • the pressure sensing display circuit is electrically connected to the electrode force presetting circuit 109A of the spot welding machine head in addition to the pressure sensing block 101A.
  • the electrode force detecting means constitutes the spot welding head of the present invention with the electrode force detecting means together with the spot welding head.
  • the welding head holder 303 can be mounted with the electrode horn 304 or a pressure rod; the electrode horn 304 transmits the electrode force to the pressure sensing block 101A in addition to the welding work, and functions as the pressure bar.
  • the horn clip 303 includes two electrode holders, a fixed electrode holder block 401 and a movable electrode holder block 402.
  • the fixed electrode holder block 401 is vertically attached to the front end surface of the force measuring end 105A of the pressure sensing block 101A by the screw 403, and the movable electrode holder block 402 and the fixed electrode holder block 401 are connected in parallel by the elastic adjustment structure.
  • the two electrode holders 401 and 402 are two longitudinal blocks of substantially the same size and substantially symmetrical in shape, and the upper ends thereof are respectively provided with screws 404 and 405 for connecting with the two output cables of the spot welding power source, and the lower ends are opposite to each other.
  • a longitudinal semi-cylindrical receiving groove is formed, and the two semi-cylindrical receiving grooves are butted to form an electrode interface 407 for mounting a cylindrical horn 406.
  • the two electrode holders 401, 402 of the horn clip respectively cut off the excess portion outside the lower end, so that the shape of the entire horn clip 303 is inverted "convex".
  • the movable electrode holder block 402 is connected to the fixed electrode holder block 401 by the elastic adjustment structure, and realizes the right and left smooth opening and closing of the welding head holder 303 while ensuring the verticality of the cylindrical welding head 406.
  • the elastic adjusting structure comprises an insulating spacer 408, an insulating pin 409, an adjusting screw 410 and a compression spring 411.
  • the connecting structure and the operation mode are: the insulating pin 409 slidably connects the movable electrode holder 402 to the fixed electrode holder.
  • a cylindrical horn 406 between the clamps 401, 402, an insulating spacer 408 and a compression spring 411 are disposed between the two electrode holders 401, 402; wherein the insulating spacer 408 is spaced apart at the fixed electrode holder 401 and active
  • the electrode holder block 402 is insulated between the two, and the compression spring 411 provides the movable electrode holder block 402 with a driving force away from the fixed electrode holder block 401; the head of the adjustment screw 410 is provided with a hand wheel.
  • the horn clip 303 is connected by the elastic adjustment structure, so that the electrode interface 407 can firmly clamp the cylindrical electrode horn 406, and the two electrode holders 401, 402 can be reliably connected only at the electrode interface 407. The other parts remain insulated.
  • the movable electrode holder 402 and the electrode interface 407 disposed at the lower end of the fixed electrode holder 401 can be used for mounting a cylinder after removing the connection of one of the output cables, in addition to the cylindrical parallel electrode horn.
  • the shape of the single-electrode welding head can also be installed with the same size of pressure bar.
  • the electrode welding head is mounted on the welding head clamp, and the electrode force is pre-set on the spot welding machine head; then the welding force transmission structure is adopted. Pressurizing the electrode horn, when the electrode force on the electrode horn reaches a preset value, the spot welding machine outputs current, because the pressure sensing display circuit is connected with the electrode force presetting circuit, and the electrode aligning electrode is connected With the transmission of force, the pressure sensor can then display the detected electrode force.
  • the welding head clip is directly mounted on the force measuring end of the pressure sensing block, and the self-weight of the welding head clip and the self-weight of the output cable mounted on the welding head clip can be "returned to zero" in the pressure sensing display circuit.
  • directly mounting the welding head clamp on the force measuring end of the pressure sensing block is equivalent to directly installing a pressure sensor on the welding head.
  • the pressure sensing block has no and in addition to detecting the real-time electrode force of the welding head. Without being disturbed by any external force, the electrode force detected by the spot welding head of the electrode force detecting device is and can only be the real-time electrode force of the welding period.
  • the resistance welding spot welding process has the characteristics of extremely short nucleation time, inability to observe in a closed state, and difficulty in extracting characteristic signals. Therefore, the electrode which is firstly subjected to thermal expansion after the spot welding period is crushed and nucleated. Force changes cannot be monitored in real time and only indirect inferences can be made.
  • the spot welding head with the electrode force detecting device of the invention solves the problem that the field of resistance welding has been unable to detect the real-time electrode force for a long time. technical challenge.
  • the prior art has a structure in which a pressure sensing block is installed in the head frame of the spot welding machine head, since the pressure sensing block is installed in the head frame, the detected electrode force includes at least the welding head clip connecting shaft.
  • the frictional force during the movement, so the electrode force detected by the pressure sensor in the head frame is not the same as the electrode force detected by the present invention, and is not a true electrode force.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Resistance Welding (AREA)

Abstract

一种电极力检测装置，其包括压力感应块(101)、压力棒(102)和压力感应显示电路(103)；把压力感应块(101)的固定端(104)安装在点焊机头(106)的焊头夹连接轴(107)下端，压力棒(102)安装在压力感应块(101)的测力端(105)；压力感应块(101)与压力感应显示电路(103)和电极力预设定电路(109)电性连接。在此基础上，还提出一种带电极力检测装置的点焊机头(106)，其通过把焊头夹(303)安装在压力感应块(101)的测力端(105)上，压力感应显示电路(103)安装在点焊机头(106)或点焊机上，在焊头夹(303)上安装的电极焊头(304)同时又是压力棒(102)，使电极力检测装置与点焊机头(106)成为一体化结构，解决了电阻焊领域长期以来无法对焊接时段的电极力进行实时检测的技术难题。

Description

电极力检测装置和带电极力检测装置的点焊机头 技术领域
本发明涉及电阻焊领域，更具体地说，本发明涉及电阻焊点焊对电极力的检测。
背景技术
为了在电阻焊点焊时段对电极力进行维持，点焊机头上有电极力预设定结构，一般通过压缩弹簧预设定电极力，当电极力达到预设定值时，通过电极力预设定结构的电极力预设定电路触发主机提供焊接电源。为了保证焊接的一致性和稳定性，特别是在焊接微细的工件时，点焊机头对电极力的调控必须要进行检测和校正。
现有技术中检测和校正点焊机头电极力的方法，都是利用电子称以如下方式实现的：首先，取一个较簿的电子称置于焊头夹的下端，然后把压力棒安装在焊头夹上，通过压力棒加压在电子称的压力感应块上，得出电极力的读数。可见，以现有技术的检测方法，如果焊头夹下端焊件的位置放置不了电子称，那么检测和校正就无法进行。
另外，电阻焊领域一直无法对点焊时段的电极力进行实时监测，给分析和研究点焊的形核带来了很大地困扰。
有鉴于此，确有必要提供一种不受焊件位置影响的电极力检测装置和一种能对焊接时段电极力进行实时监测的点焊机头。
发明内容
本发明的目的在于：一是提供一种不受焊件位置影响的电极力检测装置，二是在电极力检测装置的基础上，提供一种能实时检测焊接时段电极力的点焊 机头。
为了实现上述第一个发明目的，本发明提供了一种电极力检测装置，其包括压力感应块、压力棒和压力感应显示电路；所述压力感应块包括固定端和测力端，其固定端安装于点焊机头的焊头夹连接轴下端；所述压力棒安装在压力感应块的测力端，所述压力感应显示电路与压力感应块电性连接。
作为本发明电极力检测装置的一种改进，所述压力感应显示电路还与点焊机头上的电极力预设定结构的电极力预设定电路电性连接。
与需要在焊头夹下方放置电子称检测电极力的现有技术相比，本发明电极力检测装置把压力感应块的固定端安装在点焊机机头的焊头夹连接轴上，压力棒安装在压力感应块的测力端，压力感应显示电路同时与压力感应块和电极力预设定电路电性连接，这样，就相当于把电子称悬挂在焊件的上方，所以本发明的电极力检测装置具有不受焊件空间位置影响和更精确的技术进步。
为了实现上述第二个目的，本发明还提供了一种带电极力检测装置的点焊机头，包括电极力检测装置、点焊机头和焊头夹；所述点焊机头包括机头框架、安装在机头框架上的电极力预设定结构和焊头夹连接轴；所述电极力检测装置包括压力感应块和压力感应显示电路，其中，压力感应块包括固定端和测力端，其固定端安装在焊头夹连接轴上；焊头夹安装在压力感应块的测力端，压力感应块与压力感应显示电路电性连接。
作为本发明带电极力检测装置的点焊机头的一种改进，所述电极力预设定结构上有电极力预设定电路，电极力预设定电路和压力感应显示电路电性连接。
作为本发明带电极力检测装置的点焊机头的一种改进，所述焊头夹包括固定电极夹块和活动电极夹块二个电极夹块；固定电极夹块紧固在压力感应块的测力端，活动电极夹块通过松紧调节结构与固定电极夹块连接构成焊头夹。
作为本发明带电极力检测装置的点焊机头的一种改进，所述焊头夹的二个电极夹块的下端设置有安装电极焊头的电极接口，二个电极夹块的上端设置有 与点焊电源输出电缆连接的螺丝。
作为本发明带电极力检测装置的点焊机头的一种改进，所述松紧调节结构包括绝缘销轴、调节螺杆、绝缘垫片和压缩弹簧；绝缘销轴将活动电极夹块可滑动地连接在固定电极夹块的一侧；调节螺杆的端部穿过活动电极夹块后拧紧在固定电极夹块的对应螺孔中，绝缘垫片间隔在调节螺杆与活动电极夹块之间而使二者保持绝缘，压缩弹簧为活动电极夹块提供远离固定电极夹块的推动力。
作为本发明带电极力检测装置的点焊机头的一种改进，所述焊头夹上安装有电极焊头，电极焊头同时起到电极力检测装置压力棒传递电极力的作用。
与现有技术相比，本发明在电极力检测装置的基础上，提供一种带电极力检测装置的点焊机头，其把焊头夹安装在压力感应块的测力端上，压力感应显示电路安装在点焊机头或点焊机上，压力感应显示电路与压力感应块和电极力预设定电路电性连接，在焊头夹上安装的电极焊头同时又是压力棒，使电极力检测装置与点焊机头成为一体化结构，本发明解决了电阻焊领域长期以来无法对焊接时段的电极力进行实时检测的技术难题。
附图说明
下面结合附图和具体实施方式，对本发明电极力检测装置、带电极力检测装置的点焊机头及其有益技术效果进行详细说明。
图1为本发明电极力检测装置的结构示意图。
图2为本发明电极力检测装置安装在点焊机头上的结构示意图。
图3为本发明带电极力检测装置的点焊机头的结构示意图。
图4为图3中安装在压力感应块测力端的焊头夹的结构示意图。
具体实施方式
为了使本发明的目的、技术方案及其有益技术效果更加清晰，以下结合附图和具体实施方式，对本发明进行进一步详细说明。应当理解的是，本说明书 中描述的具体实施方式仅仅是为了解释本发明，并非为了限定本发明。
需要说明，业界所说的压力传感器包括压力感应块和压力感应显示电路，目前最常用的压力感应块为带形变腔的压力感应块，把压力感应块和压力感应显示电路做成一体化结构则可称之为电子称。
本发明包括电极力检测装置和带电极力检测装置的点焊机头二部分内容。在介绍这二部分内容之前，首先需要了解点焊机头的结构，点焊机头一般包括机头框架，在机头框架上安装有焊接力传导结构、电极力预设定结构，焊接力传导结构包括有焊头夹连接轴，其下端用以安装焊头夹，电极焊头安装在焊头夹上，电极力预设定结构包括有电极力预设定电路，当电极焊头上的电极力达到预设定值的瞬间，通过电极力预设定电路接通焊接电源，为电极焊头提供焊接电流。
下面首先介绍电极力检测装置。请参阅图1和图2，本发明电极力检测装置包括压力感应块101、压力棒102和压力感应显示电路103。其中，压力感应块101的两端分别为固定端104和测力端105；固定端104上设有安装接口111，压力感应块101可以通过安装接口111安装在点焊机头106的焊头夹连接轴107的下端。压力棒102为圆柱形的小金属棒，其安装在压力感应块101的测力端105上，用以把作用力传递到压力感应块101。压力感应显示电路103通过电源线108与压力感应块101电性连接，还通过电源线110和点焊机机头上电极力预设定结构的电极力预设定电路109电性连接。
需要注意的是，压力感应块101的固定端104通过安装接口111与焊头夹连接轴107的连接为易于装拆的连接，电极力预设定电路109与压力感应显示电路103的电连接也为易于装拆的接插件连接，压力感应块101的测力端105与压力棒102的连接则是便于对压力棒102加压高度进行调节的连接。
把本发明电极力检测装置安装在点焊机头上的方法及其工作原理如下：首先卸下原有的焊头夹，把压力感应块101的固定端104安装在点焊机头的焊头 夹连接轴107上，在压力感应块101的测力端105上安装好压力棒102；然后，把点焊机头调至工作状态，并在点焊机头上预设定电极力，随之通过点焊机头的焊接力传导结构对压力棒102加压，当加压的电极力达到预设定值时，由于压力感应显示电路103与电极力预设定电路109电性连接，故此时压力传感器检测到的电极力也就是预设定的电极力。由于压力传感器的准确性，故可用以检测和校正预设定电极力。
需要说明的是，现有技术对电极力检测和校正都是把电子称置于焊头夹的下方，把压力棒安装在焊头夹后对电子称的压力感应块加压，当听到预设定电极力电路发出触发焊接电源的喇叭声的瞬间读出电子称的压力读数。显然，现有技术电极力的检测方法，一是受制于焊头夹下方焊件的空间和位置，如果该位置不足以放置电子称，检测也就无法进行；二是当听到预设定电极力电路发出触发焊接电源的喇叭声再读出电子称的压力读数，不可避免会有时间误差，难以保证准确一致。相比之下，本发明把压力感应块直接安装在焊头夹连接轴上，以压力棒加压在焊件或工件台上，当加压力达到预设定的电极力时，由于压力感应显示电路与电极力预设定电路电性连接，压力感应显示电路显示的瞬时电极力就是预设定的电极力，十分直接、准确，完全避免了时间差及其它因素造成的误差。再者，由于把压力感应块安装在焊头夹连接轴上，相当于把电子称悬挂在焊件的上方，所以，本发明电极力检测装置完全不受焊件位置的影响。
以下接着介绍本发明带电极力检测装置的点焊机头。
请参阅图3，本发明带电极力检测装置的点焊机头包括点焊机头、电极力检测装置、焊头夹303和电极焊头304。
点焊机头包括机头框架301、机头立柱302和安装在机头框架301的焊接力传导结构及电极力预设定结构；焊接力传导结构上有焊头夹连接轴107A，电极力预设定结构上有电极力预设定电路109A。
电极力检测装置包括压力感应块101A和压力感应显示电路(图未示)。压力感应块101A的固定端104A安装在焊头夹连接轴107A的下端，焊头夹303安装在压力感应块101A的测力端105A。压力感应显示电路安装在点焊机头或安装在点焊机上。压力感应显示电路除了和压力感应块101A电性连接外，还和点焊机头的电极力预设定电路109A电性连接。这样，电极力检测装置就和点焊机头一起构成了本发明带电极力检测装置的点焊机头。
焊头夹303可以安装电极焊头304，也可以安装压力棒；电极焊头304除了作焊接工作外，同时也把电极力传递到压力感应块101A，起到与压力棒相同的作用。
请参阅图4，焊头夹303包括固定电极夹块401和活动电极夹块402二个电极夹块。安装时，通过螺丝403把固定电极夹块401垂直安装在压力感应块101A的测力端105A的前端面，再通过松紧调节结构把活动电极夹块402与固定电极夹块401并列连接。
二个电极夹块401、402为大小基本相同、形状基本对称的二个纵向块体，它们的上端分别设置有用于与点焊电源二根输出电缆连接的螺丝404、405，下端则彼此相对地开设有纵向的半圆柱形收容槽，二个半圆柱形收容槽对接后形成用于安装圆柱形的焊头406的电极接口407。为了节约空间以避免遮挡视线，焊头夹的二个电极夹块401、402分别切除了下端外侧的多余部分，使得整个焊头夹303的形状呈倒“凸”字形。
活动电极夹块402通过松紧调节结构实现与固定电极夹块401的连接，并实现焊头夹303的左右平顺开合，同时保证圆柱形焊头406安装的垂直度。所述松紧调节结构包括绝缘垫片408、绝缘销轴409、调节螺杆410和压缩弹簧411，其连接结构和操作方式为：绝缘销轴409将活动电极夹块402可滑动地连接在固定电极夹块401的一侧；将调节螺杆410的一端穿过活动电极夹块402，然后拧在固定电极夹块401的对应螺孔中，调节螺杆410用于锁紧安装在二个电极 夹块401、402之间的圆柱形焊头406，绝缘垫片408和压缩弹簧411设置在二个电极夹块401、402之间；其中，绝缘垫片408间隔在固定电极夹块401和活动电极夹块402之间而使二者保持绝缘，压缩弹簧411则为活动电极夹块402提供远离固定电极夹块401的推动力；调节螺杆410的头部设有手轮。通过松紧调节结构连接成的焊头夹303，使得电极接口407能够牢固夹紧圆柱形的电极焊头406，并且能够保证二个电极夹块401、402只在电极接口407处实现可靠的电连接，其他部分则保持绝缘。
易于理解的是，活动电极夹块402和固定电极夹块401下端设置的电极接口407除了可以安装圆柱形平行电极焊头外，在去除其中一根输出电缆的连接后，还可以用于安装圆柱形的单电极焊头，同样还可以安装相同尺寸的压力棒。
以下对带电极力检测装置的点焊机头的工作过程和原理进行说明：首先，把电极焊头安装在焊头夹上，在点焊机头上预设置好电极力；随后通过焊接力传导结构对电极焊头加压，当加压在电极焊头上的电极力达到预设定值时点焊机输出电流，由于压力感应显示电路与电极力预设定电路连接，通过电极焊头对电极力的传递，压力传感器能随即显示出其检测到的电极力。
需要说明的是，焊头夹直接安装在压力感应块的测力端，焊头夹的自重和安装在焊头夹上输出电缆的自重等，都可以通过在压力感应显示电路以“归零”的技术处理。也就是说，把焊头夹直接安装在压力感应块的测力端相当于在焊头上直接安装了压力传感器，在焊接时段，压力感应块除了检测到焊头实时的电极力外，没有和不受其它任何外力的干扰，带电极力检测装置的点焊机头检测到的电极力就是而且只能是焊接时段的实时电极力。
还需要说明的是，电阻焊点焊过程具有形核时间极短、处于封闭状态无法观测、特征信号提取困难等特点，因此长期以来对点焊时段焊头先受热膨胀后被压扁形核的电极力变化无法进行实时监测，只能进行间接的推断。本发明带电极力检测装置的点焊机头解决了电阻焊领域长期以来无法检测实时电极力的 技术难题。
另外，现有技术虽然有在点焊机头的机头框架内安装压力感应块的结构，但由于把压力感应块安装在机头框架内，其检测到的电极力至少包括焊头夹连接轴运动时的摩擦力，所以在机头框架内以压力传感器检测到的电极力和本发明检测到的电极力并不相同，不是真实电极力。
根据上述说明书的揭示和教导，本发明所属领域的技术人员还可以对上述实施方式进行适当的变更和修改。因此，本发明并不局限于上面揭示和描述的具体实施方式，对本发明的一些修改和变更也应当落入本发明的权利要求的保护范围内。此外，尽管本说明书中使用了一些特定的术语，但这些术语只是为了方便说明，并不对本发明构成任何限制。

Claims (8)

  1. 一种电极力检测装置，其特征在于：包括压力感应块、压力棒和压力感应显示电路；所述压力感应块包括固定端和测力端，其固定端安装于点焊机头的焊头夹连接轴下端；所述压力棒安装在压力感应块的测力端，所述压力感应显示电路与压力感应块电性连接。
  2. 根据权利要求1所述的电极力检测装置，其特征在于：所述压力感应显示电路还与点焊机头上的电极力预设定结构的电极力预设定电路电性连接。
  3. 一种带电极力检测装置的点焊机头，其特征在于：包括电极力检测装置、点焊机头和焊头夹；所述点焊机头包括机头框架、安装在机头框架上的电极力预设定结构和焊头夹连接轴；所述电极力检测装置包括压力感应块和压力感应显示电路，其中，压力感应块包括固定端和测力端，其固定端安装在焊头夹连接轴上；焊头夹安装在压力感应块的测力端，压力感应块与压力感应显示电路电性连接。
  4. 根据权利要求3所述的带电极力检测装置的点焊机头，其特征在于：所述电极力预设定结构上有电极力预设定电路，电极力预设定电路和压力感应显示电路电性连接。
  5. 根据权利要求3所述的带电极力检测装置的点焊机头，其特征在于：所述焊头夹包括固定电极夹块和活动电极夹块二个电极夹块；固定电极夹块紧固在压力感应块的测力端，活动电极夹块通过松紧调节结构与固定电极夹块连接构成焊头夹。
  6. 根据权利要求5所述的带电极力检测装置的点焊机头，其特征在于：所述焊头夹的二个电极夹块的下端设置有安装电极焊头的电极接口，二个电极夹块的上端设置有与点焊电源输出电缆连接的螺丝。
  7. 根据权利要求5所述的带电极力检测装置的点焊机头，其特征在于：所 述松紧调节结构包括绝缘销轴、调节螺杆、绝缘垫片和压缩弹簧；绝缘销轴将活动电极夹块可滑动地连接在固定电极夹块的一侧；调节螺杆的端部穿过活动电极夹块后拧紧在固定电极夹块的对应螺孔中，绝缘垫片间隔在调节螺杆与活动电极夹块之间而使二者保持绝缘，压缩弹簧为活动电极夹块提供远离固定电极夹块的推动力。
  8. 根据权利要求3至7中任一项所述的带电极力检测装置的点焊机头，其特征在于：所述焊头夹上安装有电极焊头，电极焊头同时起到电极力检测装置压力棒传递电极力的作用。
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