WO2018000391A1 - 精确电极力加压系统的点焊机头 - Google Patents
精确电极力加压系统的点焊机头 Download PDFInfo
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- WO2018000391A1 WO2018000391A1 PCT/CN2016/088032 CN2016088032W WO2018000391A1 WO 2018000391 A1 WO2018000391 A1 WO 2018000391A1 CN 2016088032 W CN2016088032 W CN 2016088032W WO 2018000391 A1 WO2018000391 A1 WO 2018000391A1
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- welding
- electrode force
- force
- electrode
- pressure sensor
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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
-
- 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 invention belongs to the field of electric resistance welding, and more particularly to a spot welding machine head of a precise electrode force pressing system, which can be applied to electric resistance spot welding of minute workpieces.
- the pressure sensor has the advantages of accurate detection of force and simple structure, and is therefore widely used for detecting various forces and measuring weight.
- the pressure sensor is usually applied to the spot welding head in a manner of setting the electrode force.
- the basic requirements for precise electrode force for spot welding of fine workpieces cannot be met.
- the object of the present invention is to provide a spot welding machine head of a precise electrode force pressing system, which can meet the requirement that the resistance welding has a precise electrode force for spot welding of a fine workpiece, and can have an electrode force throughout the welding period. Maintain a relatively constant range within the preset range.
- the present invention provides a spot welding head of a precision electrode force pressurization system comprising:
- a welding force transmission shaft mounted on the head frame, one side of the welding force transmission shaft is connected to the welding force providing device by a welding force transmission clip fastened thereto, and the other side of the welding force transmission shaft is tightly placed
- An electrode force transmission clamp is fastened to the electrode force transmission shaft;
- the pressure sensor fastened to the welding force transmission shaft, the pressure sensor is provided with a fixed end fixed to the welding force transmission shaft and a measuring end away from the fixed end;
- the welding force transmission shaft is provided with a compression spring abutting on the electrode force transmission clamp
- the force measurement end of the pressure sensor is provided with a buffer spring abutting on the electrode force transmission clamp
- a tension spring is disposed between the fixed end of the pressure sensor and the electrode force transmission clip.
- the pressure sensor is provided with a pressure sensor circuit including an electrode force detecting circuit and a welding power source trigger circuit.
- a transfer switch is disposed between the electrode force detecting circuit and the welding power source triggering circuit, and a compression spring preload on the welding force transmission shaft is required.
- the welding power source trigger circuit turns on the reference point of the welding power source, and the electrode force detecting circuit uses the detected value of the preset electrode force as a reference point.
- the welding power source is turned on when the electrode force on the weldment is greater than the reference point.
- the pressure sensor circuit, the electrode force detecting circuit, the welding power source triggering circuit, and the changeover switch are mounted on the head frame.
- the spot welding head of the precise electrode force pressing system of the present invention has the following advantages:
- the welding force transmission shaft is provided with a pressure sensor.
- the force measuring end of the pressure sensor abuts against the electrode force transmission clip through the buffer spring, which can accurately detect the pre-set electrode force of the compression spring.
- the pressure sensor circuit is provided with an electrode force detecting circuit and a welding power source trigger circuit, so that the pressure sensor has both the function of detecting the pre-set electrode force and the function of triggering the welding power source for welding.
- the electrode force detecting circuit is cut off by the transfer switch and the welding power source trigger circuit is turned on, and the welding power source is triggered when the force of the welding member is greater than the reference point.
- a tension spring is provided at the fixed end of the pressure sensor to achieve the electrode force throughout the welding period Both remain relatively constant over the pre-set tension range of the compression spring.
- FIG. 1 is a schematic view showing the structure of a spot welding head of a precise electrode force pressurizing system of the present invention.
- FIG. 2 is a schematic view showing the structure of a pressure sensor of a spot welding head of a precise electrode force pressurizing system of the present invention.
- the spot welding head of the precise electrode force pressing system of the present invention comprises: a head frame 101; a welding force transmission shaft 102 mounted on the head frame 101, and a welding force transmission shaft 102.
- One side is connected to the welding force providing device by a welding force transmission clip 105 fastened thereto, and the other side of the welding force transmission shaft 102 is fastened and connected with an electrode force transmission through an electrode force transmission clip 106 immediately placed thereon.
- the pressure sensor 107 is provided with a fixed end 113 fixed to the welding force transmission shaft 102 and a measuring end 114 away from the fixed end 113; wherein, the welding force
- the transmission shaft 102 is provided with a compression spring 109 abutting against the electrode force transmission clip 106.
- the force measuring end 114 of the pressure sensor 107 is provided with a buffer spring 108 abutting against the electrode force transmission clip 106.
- the head frame 101 is further provided with a positioning shaft 104, and the welding force transmission shaft 102, the electrode force transmission shaft 103 and the positioning shaft 104 are longitudinally parallelly mounted on the head frame 101, and The welding force transmission shaft 102 and the electrode force transmission shaft 103 are smoothly slidable along the head frame 101 and the positioning shaft 104.
- One end of the welding force transmission clip 105 is fastened to the welding force transmission shaft 102, and the other end of the welding force transmission clip 105 is connected to a welding force providing device.
- the welding force transmission The other end of the clip 105 is coupled to the cable 112 of the artificial power foot pedal.
- the positioning shaft 104 is not indispensable in the present invention, but when the illustrated embodiment is coupled to the artificial power cable 112, its function is to make the welding force transmission clip 105 and the electrode force transmission clip 106 better. Positioning.
- One end of the electrode force transmission clip 106 is fastened to the electrode force transmission shaft 103, and the electrode force transmission clip 106 is coupled to a compression spring 109 that provides a predetermined electrode force.
- the pressure sensor 107 is provided with a fixed end 113 fixed to the welding force transmission shaft 102 and a measuring end 114 away from the fixed end 113.
- the fixed end 113 is fastened to the welding force transmission shaft 102, and the force measuring end 114 of the pressure sensor 107 passes.
- the buffer spring 108 is coupled to the electrode force transmission clip 106.
- the front outer surface of the head frame 101 is provided with a rectangular recess 115 for mounting a pressure sensor circuit.
- the spot welder head of the precision electrode force pressurization system is mounted to the table by the nose column 116.
- the fixed end 113 of the pressure sensor 107 and the electrode force transmission clip 106 are mounted with a tension spring 117 having the following two functions:
- the self-weight of the electrode force transmission mechanism is all pressurized on the force measuring end 114 of the pressure sensor 107.
- the self-weight of the electrode force transmission mechanism is about 0.5 kg. If the welding is smaller than the small diameter weldment of ⁇ 0.05 mm, the self-weight of 0.5 kg is not a small force, and the initial force of the electrode is displayed. The value must be the self-weight of the electrode force transmitting mechanism, and therefore, if it is not resistant to the self-weight of the electrode force transmitting mechanism, the accuracy of the spot welding head of the precise electrode force pressurizing system of the present invention will be affected.
- the second is to preset the electrode force maintenance and the relatively constant function during the welding period. It can be known from the structure shown in FIG. 1 that when the force on the weldment is less than the preset electrode force of the force measuring end 114, the welding power source is triggered. At this time, if there is no suitable tension against the electrode force preset by the compression spring 109, the electrode force during the welding period changes, and the electrode force during the welding period cannot be maintained and relatively constant in the preset range.
- the present invention is on the fixed end 113 of the pressure sensor 107 and the electrode force transmission clip 106.
- the tension spring 117 is installed to not only have the function of resisting the self-weight of the electrode force transmission mechanism, but also to maintain and relatively constant the electrode force in the preset range during the welding period.
- the force measuring end 114 and the fixed end 113 of the pressure sensor 107 shown in FIG. 1 are respectively abutted against the electrode force conducting clip 106 by the buffer spring 108 or the tension spring 117, the specific mounting manner is not special.
- the fixed end 113 and the force measuring end 114 of the pressure sensor 107 may be mounted as shown in FIG. 1, or the mounting positions of the fixed end 113 and the measuring end 114 may be interchanged, which are all equivalent structures of the present invention. It falls within the scope of protection of the patent of the present invention.
- the structure and circuit principle of the pressure sensor 107 will be described below with reference to FIG.
- the pressure sensor 107 includes a pressure sensor metal portion and a pressure sensing circuit, and the metal portion of the pressure sensor is conventionally referred to as a pressure sensor.
- the pressure sensor 107 is a metal body with a dumbbell-shaped frame, and the pressure sensor 107 is provided with a fixed end 113 fastenable to the welding force transmission shaft 102 and a force measuring end 114 away from the fixed end 113, the pressure sensor
- the pressure sensor circuit 202 is electrically connected through the wire 201.
- the pressure sensor circuit 202 includes an electrode force detecting circuit 203 and a welding power source trigger circuit 204, and a changeover switch 205 is provided between the electrode force detecting circuit 203 and the welding power source trigger circuit 204.
- the welding power source trigger circuit 204 When it is necessary to preset the electrode force on the compression spring 109 of the welding power transmission shaft 102, the welding power source trigger circuit 204 is turned off by the changeover switch 205 and the electrode force detecting circuit 203 is turned on; when the welding is required, the switching switch 205 is cut off.
- the electrode force detecting circuit 203 turns on the welding power source trigger circuit 204.
- the electrode force detecting circuit 203 detects that the compression spring 109 pre-sets the value of the electrode force, the electrode force detecting circuit is cut off. 203 and the welding power source trigger circuit 204 is turned on, and the welding power source triggering circuit 204 uses the detection value of the preset electrode force by the electrode force detecting circuit 203 as a reference point. When the force on the welding member is greater than the reference point, the welding is performed. The power trigger circuit 204 sends a signal to turn on the welding current for soldering.
- the working principle of the pressure sensor circuit 202 includes deforming the deformation frame
- the weak potential difference is converted into a force display.
- the pressure sensor circuit 202 (including the electrode force detecting circuit 203, welding)
- the power trigger circuit 204 and the changeover switch 205) are all mounted on the head frame 101.
- Resistance welding requires spot welding of fine workpieces to provide a precise power pressurization system that includes precise electrode force pre-settings and maintains a relatively constant electrode force over a predetermined range throughout the weld period.
- the preset electrode force is generated by changing the compression amount of the compression spring 109, and the spring compression force directly acts on the force measuring end 114 of the pressure sensor 107 through the buffer spring 108 and the electrode force transmission clip 106.
- the accuracy of the pressure sensor for detecting weight and force is less than five ten thousandths.
- This embodiment is the first to accurately detect the electrode force with a pressure sensor.
- the inventor of the present application proposed a patent application (patent number ZL01114856.X) of "point welding machine head with pressure display” in 2003, which is an indirect calculation of the resistance value change of the sliding potentiometer driven by the stroke of the compression spring. Pre-set electrode force, so the patented "point welder head with pressure display" accuracy is not high enough for pre-set electrode force detection.
- the present invention first proposes that the pressure sensor circuit 202 includes an electrode force detecting circuit 203 and a welding power source trigger circuit 204.
- the detection value of the preset electrode force can be obtained by the electrode force detecting circuit 203, and it is further proposed that the electrode force detecting circuit 203 is turned off by the changeover switch 205 and the welding power source trigger circuit 204 is turned on at the same time.
- the spot welding head of the precise electrode force pressing system of the embodiment can enter the following welding work process:
- the welding force is driven by the welding force transmission clip 105 to include a welding force transmission shaft 102, a pressure sensor 107 fastened to the welding force transmission shaft 102, an electrode force transmission clip 106, an electrode force transmission shaft 103, and an electrode force transmission shaft.
- the welding head clamp 111 and the six parts of the welding head 110 act together to pressurize the weldment.
- the welding head 110 is pressurized at the moment when the force of the weldment is greater than the pre-set electrode force, that is, the buffer spring 108 and
- the welding power source trigger circuit 204 is turned on to achieve the welding.
- the tension spring 117 can provide a proper tension to ensure that the electrode force is maintained within a preset range throughout the welding period. And relatively constant.
- the spot welding head of the precise electrode force pressurizing system of the present invention has the following advantages over the prior art:
- the welding force transmission shaft 102 is provided with a pressure sensor 107.
- the force measuring end 114 of the pressure sensor 107 abuts against the electrode force transmission clip 106 through the buffer spring 108, and accurate detection of the pre-set electrode force of the compression spring 109 can be realized.
- the pressure sensor circuit is provided with an electrode force detecting circuit 203 and a welding power source trigger circuit 204, so that the pressure sensor 107 has both a function of detecting a predetermined electrode force and a function of triggering a welding power source for welding.
- the electrode force detecting circuit 203 and the welding power source trigger circuit 204 are cut by the changeover switch 205, and the welding power source is triggered when the force of the weldment is greater than the reference point.
- a tension spring 117 is provided at the fixed end 113 of the pressure sensor 107, so that the electrode force is maintained relatively constant over the pre-set tension range of the compression spring 109 throughout the welding period.
- the present invention effectively solves the technical problem of real-time detection of the electrode force during the welding period in the field of resistance welding.
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Abstract
一种精确电极力加压系统的点焊机头，其包括：机头框架（101）；安装于机头框架（101）上的焊接力传动轴（102），焊接力传动轴（102）的一侧通过紧固于其上的焊接力传动夹（105）与焊接作用力提供装置连接，焊接力传动轴（102）的另一侧通过紧置于其上的电极力传动夹（106）紧固连接有电极力传动轴（103）；以及紧固于焊接力传动轴（103）上的压力传感器（107），压力传感器（107）设有固定于焊接力传动轴（102）上的固定端（113）和远离固定端（113）的测力端（114），其中，焊接力传动轴（102）中设有抵接于电极力传动夹（106）上的压缩弹簧（109），压力传感器（107）的测力端（114）上设有抵接于电极力传动夹（106）上的缓冲弹簧（108）。该点焊机头可满足电阻焊对微细工件点焊预设定电极力必须精确的要求，且能在整个焊接时段电极力都在预设定范围内维持相对恒定。
Description
本发明属于电阻焊领域，更具体地说，本发明涉及一种精确电极力加压系统的点焊机头，其可以适用于对微小工件进行电阻焊点焊。
压力传感器具有能精确检测作用力和结构简单等优点，因此被广泛应用于检测各种作用力和测量重量。现有技术中，压力传感器通常是以设定电极力的方式应用于点焊机头上。但是，由于结构错误随动性能差，无法满足微细工件点焊对精确电极力的基本要求。
有鉴于于此，确有必要提出一种精确电极力加压系统的点焊机头。
发明内容
本发明的目的在于：提供一种精确电极力加压系统的点焊机头，其可满足电阻焊对微细工件点焊预设定电极力必须精确的要求，且能在整个焊接时段电极力都在预设定范围内维持相对恒定。
为了实现上述发明目的，本发明提供了一种精确电极力加压系统的点焊机头，其包括：
机头框架；
安装于机头框架上的焊接力传动轴，焊接力传动轴的一侧通过紧固于其上的焊接力传动夹与焊接作用力提供装置连接，焊接力传动轴的另一侧通过紧置于其上的电极力传动夹紧固连接有电极力传动轴；以及
紧固于焊接力传动轴上的压力传感器，压力传感器设有固定于焊接力传动轴上的固定端和远离固定端的测力端；
其中，焊接力传动轴中设有抵接于电极力传动夹上的压缩弹簧，压力传感器的测力端上设有抵接于电极力传动夹上的缓冲弹簧。
作为本发明精确电极力加压系统的点焊机头的一种改进，所述压力传感器的固定端与所述电极力传动夹之间设有张力弹簧。
作为本发明精确电极力加压系统的点焊机头的一种改进，所述压力传感器设有压力传感器电路，压力传感器电路包括电极力检测电路和焊接电源触发电路。
作为本发明精确电极力加压系统的点焊机头的一种改进，所述电极力检测电路和焊接电源触发电路之间设置有转换开关，需要在所述焊接力传动轴上的压缩弹簧预设电极力时，通过转换开关切断焊接电源触发电路并接通电极力检测电路；需要进行焊接时，通过转换开关切断电极力检测电路并接通焊接电源触发电路。
作为本发明精确电极力加压系统的点焊机头的一种改进，所述焊接电源触发电路接通焊接电源的基准点以电极力检测电路对预设定电极力的检测值作基准点，当焊件上的电极力大于基准点的瞬间接通焊接电源。
作为本发明精确电极力加压系统的点焊机头的一种改进，所述压力传感器电路、电极力检测电路和焊接电源触发电路、转换开关安装在所述机头框架上。
相对于现有技术，本发明精确电极力加压系统的点焊机头具有以下优点：
1)焊接力传动轴上设有压力传感器，压力传感器的测力端通过缓冲弹簧与电极力传动夹相抵接，可实现对压缩弹簧预设定电极力的精确检测。
2)压力传感器电路设置了电极力检测电路和焊接电源触发电路，使压力传感器既具有对预设定电极力检测的功能，又具有触发焊接电源实现焊接的功能。
3)以电极力预设定的检测值作基准点，通过转换开关切断电极力检测电路和接通焊接电源触发电路，当焊件的作用力大于基准点的瞬间触发焊接电源。
4)在压力传感器的固定端设置有张力弹簧，可实现在整个焊接时段电极力
都在压缩弹簧预设定的张力范围内维持相对恒定。
下面结合附图和具体实施方式，对本发明精确电极力加压系统的点焊机头及其技术效果进行详细说明。
图1为本发明精确电极力加压系统的点焊机头的结构示意图。
图2为本发明精确电极力加压系统的点焊机头的压力传感器的结构示意图。
为了使本发明的发明目的、技术方案及其技术效果更加清晰，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。
请参照图1和图2所示，本发明精确电极力加压系统的点焊机头包括：机头框架101；安装于机头框架101上的焊接力传动轴102，焊接力传动轴102的一侧通过紧固于其上的焊接力传动夹105与焊接作用力提供装置连接，焊接力传动轴102的另一侧通过紧置于其上的电极力传动夹106紧固连接有电极力传动轴103；以及紧固于焊接力传动轴102上的压力传感器107，压力传感器107设有固定于焊接力传动轴102上的固定端113和远离固定端113的测力端114；其中，焊接力传动轴102中设有抵接于电极力传动夹106上的压缩弹簧109，压力传感器107的测力端114上设有抵接于电极力传动夹106上的缓冲弹簧108。
在图1所示的实施方式中，机头框架101上还设有定位轴104，焊接力传动轴102、电极力传动轴103和定位轴104都纵向平行间隔安装在机头框架101上，且焊接力传动轴102和电极力传动轴103可沿着机头框架101和定位轴104平顺滑动。
焊接力传动夹105的一端紧固在焊接力传动轴102上，焊接力传动夹105的另一端与提供焊接作用力提供装置相连接，在图示实施方式中，焊接力传动
夹105的另一端与人工动力脚踏板的拉索112相连接。需要说明的是，定位轴104在本发明中并非不可或缺，但在图示实施方式与人工动力的拉索112连接时，其作用在于使焊接力传动夹105和电极力传动夹106更好定位。
电极力传动夹106的一端紧固在电极力传动轴103上，电极力传动夹106与提供预设定电极力的压缩弹簧109相连接。
压力传感器107设有固定于焊接力传动轴102上的固定端113和远离固定端113的测力端114，固定端113紧固在焊接力传动轴102上，压力传感器107的测力端114通过缓冲弹簧108与电极力传动夹106相连接。机头框架101的前外立面上设有长方形凹槽115，用于安装压力传感器电路。在图示实施方式中，精确电极力加压系统的点焊机头通过机头立柱116安装在工作台上。
请继续参照图1所示，根据本发明的一个优选实施方式，压力传感器107的固定端113与电极力传动夹106之安装有张力弹簧117，张力弹簧117具有以下两个功能：
一是抗电极力传导机构自重功能，本发明把电极力传导夹106、电极力传动轴103、安装在电极力传动轴103上的焊头夹111等结构称为电极力传动机构，从图1可以知道，电极力传动机构的自重全部加压在压力传感器107的测力端114上。例如，在图示实施方式中，电极力传导机构的自重约0.5kg，如果焊接小于Φ0.05mm的小线径焊件，0.5kg的自重是不小的作用力，且在电极力显示的初始值必须是电极力传导机构的自重，因此，如果不能抗电极力传导机构的自重，将影响本发明精确电极力加压系统的点焊机头的精确性。
二是在焊接时段预设定电极力维持和相对恒定功能，从图1所示的结构中可以知道，当焊件上的作用力小于测力端114的预设定电极力时触发焊接电源，此时，如果没有合适的张力对抗压缩弹簧109预设定的电极力，焊接时段的电极力就会发生改变，焊接时段的电极力就不可能在预设定范围维持和相对恒定。
综上所述，本发明在压力传感器107的固定端113与电极力传动夹106上
安装张力弹簧117，不但具有抗电极力传导机构自重的功能，还实现在焊接时段电极力在预设定范围维持和相对恒定。
还需要说明的是，虽然图1所示的压力传感器107的测力端114和固定端113分别通过缓冲弹簧108或张力弹簧117与电极力传导夹106抵接，但是，具体的安装方式没有特别限制，例如，既可以如图1所示安装压力传感器107的固定端113和测力端114，也可以将固定端113和测力端114的安装位置互换，都属于本发明的等同结构而落入本发明专利的保护范围。
以下结合图2，说明压力传感器107的结构和电路原理。压力传感器107包括压力传感器金属部分和压力传感电路，习惯上把压力传感器金属部分称为压力传感器。
如图2所示，压力传感器107为带哑铃形变框的金属体，压力传感器107设有可紧固于焊接力传动轴102上的固定端113和远离固定端113的测力端114，压力传感器107通过导线201电性连接有压力传感器电路202。在图2所示的实施方式中，压力传感器电路202包括电极力检测电路203和焊接电源触发电路204，电极力检测电路203和焊接电源触发电路204之间设有转换开关205。
当需要在焊接力传动轴102的压缩弹簧109上预设定电极力时，通过转换开关205切断焊接电源触发电路204并接通电极力检测电路203；当需要进行焊接时，通过转换开关205切断电极力检测电路203并接通焊接电源触发电路204。
需要说明的是，电极力检测电路203和焊接电源触发电路204两者之间存在内在联系：当电极力检测电路203检测到压缩弹簧109预设定好电极力的值时，切断电极力检测电路203并接通焊接电源触发电路204，而焊接电源触发电路204则以电极力检测电路203对预设定电极力的检测值作基准点，当焊件上的作用力大于基准点的瞬间，焊接电源触发电路204发出讯号，导通焊接电流实现焊接。
还需要说明的是，由于压力传感器电路202的工作原理包括把形变框形变
产生微弱的电势差转化为力的显示，为了避免压力传感器107中连接压力传感器电路202的导线201过长造成讯号衰减，在图示实施方式中，压力传感器电路202(包括电极力检测电路203、焊接电源触发电路204、转换开关205)都安装在机头框架101上。
以下结合图1和图2所示，详细描述本发明精确电极力加压系统的点焊机头的工作过程和工作原理。
电阻焊对微细工件的点焊需要提供精确电力加压系统，精确电极力加压系统包括精确电极力预设定和在整个焊接时段电极力都要在预设定范围内维持相对恒定。
请参照图1所示，预设定的电极力是通过改变压缩弹簧109的压缩量产生，弹簧压缩力通过缓冲弹簧108和电极力传动夹106直接作用于压力传感器107的测力端114。众所周知，压力传感器对重量和力的检测精确度小于万分之五，本实施例率先实现以压力传感器精确检测电极力。本申请的发明人2003年曾提出“带压力显示的点电焊机机头”的专利申请(专利号ZL01114856.X)，该专利技术是以压缩弹簧的行程带动滑动电位器的电阻值改变间接计算预设定电极力，因而“带压力显示的点电焊机机头”专利技术对预设定电极力检测的精确度不高。
请参照图2所示，本发明率先提出压力传感器电路202包括电极力检测电路203和焊接电源触发电路204。可通过电极力检测电路203取得预设定电极力的检测值，进一步提出以该检测值为基准点并通过转换开关205切断电极力检测电路203同时接通焊接电源触发电路204，此时，本实施例精确电极力加压系统的点焊机头可以进入如下焊接工作过程：
焊接作用力通过焊接力传动夹105带动包括焊接力传动轴102、紧固在焊接力传动轴102上的压力传感器107、电极力传动夹106、电极力传动轴103、安装在电极力传动轴上的焊头夹111和焊头110六部分一起活动向焊件加压。当焊头110加压在焊件的作用力大于预设定电极力的瞬间，也就是缓冲弹簧108与
压力传感器107测力端的压缩力小于基准点的瞬间，接通焊接电源触发电路204实现焊接。需要说明的是，在缓冲弹簧108与压力传感器107测力端114的压缩力小于基准点的焊接时段，张力弹簧117能提供合适的张力，保证在整个焊接时段电极力都在预设定范围维持和相对恒定。
结合以上对本发明实施方式的详细描述可以看出，相对于现有技术，本发明精确电极力加压系统的点焊机头具有以下优点：
1)焊接力传动轴102上设有压力传感器107，压力传感器107的测力端114通过缓冲弹簧108与电极力传动夹106相抵接，可实现对压缩弹簧109预设定电极力的精确检测。
2)压力传感器电路设置了电极力检测电路203和焊接电源触发电路204，使压力传感器107既具有对预设定电极力检测的功能，又具有触发焊接电源实现焊接的功能。
3)以电极力预设定的检测值作基准点，通过转换开关205切断电极力检测电路203和接通焊接电源触发电路204，当焊件的作用力大于基准点的瞬间触发焊接电源。
4)在压力传感器107的固定端113设置有张力弹簧117，可实现在整个焊接时段电极力都在压缩弹簧109预设定的张力范围内维持相对恒定。
此外，需要进一步说明的是，在整个焊接时段，由于压缩弹簧109仍处于预设定电极力的压缩状态，由于压缩弹簧109的压缩力与张力弹簧117的张力相适应，因此能够确保在整个焊接时段电极力都在精确的预设定范围维持相对恒定。本申请的发明人曾以“T型焊头夹”(专利申请号201510033849.3)对焊接时段的电极力进行实时检测，由于T型焊头夹上安装有压力传感器并能够对焊接时段的电极力进行实时检测，发现T型焊头夹检测到的电极力与本实施例对预设定电极力检测值基本相同。电阻焊领域认为，电阻焊的焊接时段处于全封闭状态，无法对各种焊接参数包括电极力参数实时检测认为是电阻焊领域的技术
难题。因此，从另一角度说明，本发明有效解决了电阻焊领域对焊接时段电极力实时检测的技术难题。
根据上述原理，本发明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 (6)
- 一种精确电极力加压系统的点焊机头，包括：机头框架；安装于机头框架上的焊接力传动轴，焊接力传动轴的一侧通过紧固于其上的焊接力传动夹与焊接作用力提供装置连接，焊接力传动轴的另一侧通过紧置于其上的电极力传动夹紧固连接有电极力传动轴；以及紧固于焊接力传动轴上的压力传感器，压力传感器设有固定于焊接力传动轴上的固定端和远离固定端的测力端；其中，焊接力传动轴中设有抵接于电极力传动夹上的压缩弹簧，压力传感器的测力端上设有抵接于电极力传动夹上的缓冲弹簧。
- 根据权利要求1所述的精确电极力加压系统的点焊机头，其特征在于，所述压力传感器的固定端与所述电极力传动夹之间设有张力弹簧。
- 根据权利要求1所述的精确电极力加压系统的点焊机头，其特征在于，所述压力传感器设有压力传感器电路，压力传感器电路包括电极力检测电路和焊接电源触发电路。
- 根据权利要求3所述的精确电极力加压系统的点焊机头，其特征在于，所述电极力检测电路和焊接电源触发电路之间设置有转换开关，需要在所述焊接力传动轴上的压缩弹簧预设电极力时，通过转换开关切断焊接电源触发电路并接通电极力检测电路；需要进行焊接时，通过转换开关切断电极力检测电路并接通焊接电源触发电路。
- 根据权利要求3或4所述的精确电极力加压系统的点焊机头，其特征在于，所述焊接电源触发电路接通焊接电源的基准点以电极力检测电路对预设定电极力的检测值作基准点，当焊件上的电极力大于基准点的瞬间接通焊接电源。
- 根据权利要求3或4所述的精确电极力加压系统的点焊机头，其特征在 于，所述压力传感器电路、电极力检测电路和焊接电源触发电路、转换开关安装在所述机头框架上。
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