WO2020087959A1 - 冷却水防落装置 - Google Patents

冷却水防落装置 Download PDF

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Publication number
WO2020087959A1
WO2020087959A1 PCT/CN2019/093457 CN2019093457W WO2020087959A1 WO 2020087959 A1 WO2020087959 A1 WO 2020087959A1 CN 2019093457 W CN2019093457 W CN 2019093457W WO 2020087959 A1 WO2020087959 A1 WO 2020087959A1
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Prior art keywords
cooling water
cylinder
electrode
guide rod
water passage
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PCT/CN2019/093457
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English (en)
French (fr)
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刘军良
杨贤德
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广州市极动焊接机械有限公司
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Publication of WO2020087959A1 publication Critical patent/WO2020087959A1/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
    • B23K11/36—Auxiliary equipment
    • 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

Definitions

  • the invention relates to a cooling water fall prevention device which is connected to a spot welding machine and prevents the cooling water for cooling the electrode from the front end of the welding gun when the electrode is removed from the front end of the welding gun during the electrode replacement operation Dripping.
  • Patent Document 1 JPA2014-14843 discloses that a tip of a welding torch (shank) of a spot welding machine is detachably mounted with an electrode that contacts with a welding object during welding and is pressurized and energized. If the electrode reaches a high temperature The deformation affects the quality of the welded part. Therefore, by circulating cooling water through the welding gun inside the electrode, even if the welding operation is repeated, the electrode will not reach an extremely high temperature.
  • the cooling water fall prevention device 1A described above includes a cylindrical body 5A whose one end opening is connected to the cooling water passage 41A, and whose other end opening portion is connected to and covered by the cylinder 6A.
  • the piston rod 6B of the cylinder 6A expands and contracts toward the inside of the cylinder 5A along the cylinder center line c1 of the cylinder 5A.
  • a separator 5B is attached to the front end of the piston rod 6B.
  • the separator 5B divides the inside of the cylinder 5A into a cooling water passage 41A side space s1 and a cylinder 6A side space s2 along the cylinder center line c1.
  • the outer peripheral portion is provided with an annular sealing body 5C that seals between the separator 5B and the inner peripheral surface of the cylindrical body 5A.
  • the shut-off valve 11A provided in the cooling water passage 41A stops the circulation of the cooling water of the cooling unit 4A, and shrinks the piston rod 6B in the cylinder 6A, thereby causing the cylinder
  • the cooling water passage 41A side space s1 inside the body 5A becomes negative pressure, thereby sucking the cooling water of the cooling water passage 41A into the cooling water passage 41A side space s1, and preventing the cooling water from dripping from the opening of the front end of the welding gun 2A.
  • the present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a device capable of reliably preventing the cooling water from dripping from the tip of the welding gun during the electrode replacement operation, and even if the electrode replacement operation is repeated. Cooling water anti-drop device for spot welding machine.
  • the present invention is characterized in that a cylinder that sucks cooling water from the cooling water passage is separated from a fluid pressure cylinder.
  • the cooling water fall prevention device is connected to a spot welding machine having a welding gun with an electrode detachably mounted at the front end, and cooling water passes through the cooling water passage extending to the electrode provided on the welding gun.
  • the internal circulation of the electrode the cooling water fall prevention device is configured to stop the circulation of the cooling water inside the electrode with a shut-off valve provided in the cooling water passage when the electrode attached to the tip of the welding gun is removed.
  • a shut-off valve provided in the cooling water passage when the electrode attached to the tip of the welding gun is removed
  • the cooling water fall prevention device adopts the following solution.
  • the invention of the first aspect is characterized in that the cooling water fall prevention device includes: a cylinder body having an opening connected to the cooling water passage and a guide hole at the center of the other end; One or more fluid pressure cylinders are provided on the cylinder in the direction of the intersection and the piston rod expands and contracts along the center line of the cylinder.
  • a partition and a guide rod are arranged inside the cylinder, and the partition divides the cylinder
  • the inside of the body is divided into a space on the side of the cooling water passage and a space on the side of the guide hole, and seals the inner peripheral surface of the above-mentioned cylinder body
  • the guide rod extends on the center line of the above-mentioned cylinder, and is slidably inserted into the above-mentioned guide
  • one end of the guide rod is connected to the partition plate, and on the other end side of the guide rod, a coupling bracket for connecting the other end of the guide rod to the front end of the piston rod is provided.
  • the invention of the second aspect is the invention of the first aspect, characterized in that the cylinder is provided at a position close to the cylinder in a direction orthogonal to the center line of the cylinder, and is arranged such that the piston rod faces the cooling The opposite side of the water path expands and contracts.
  • the invention of the third aspect is the invention of the second aspect, characterized in that the cylinders are arranged as a pair of cylinders of the same kind, the pair of cylinders are symmetrically arranged with the cylinder body centered on the cylinder body, and the connection
  • the bracket is in the form of a strip extending in a direction perpendicular to the center line of the cylinder, the other end of the guide rod is fixed to a central portion in the longitudinal direction of the connecting bracket, and the front ends of the piston rods of the pair of cylinders are respectively fixed to the connecting bracket One end and the other end in the length direction.
  • the airtightness between the separator and the inner surface of the cylinder disappears, which in turn causes the cooling water to enter the cylinder
  • the cylinder is separated from the cylinder by the fluid pressure, so the cooling water will not penetrate into the cylinder. Therefore, it is possible to reliably prevent the cooling water from dripping from the front end of the welding torch during the electrode replacement operation, and to prevent the device failure caused by the fluid pressure cylinder due to repeated work.
  • the device since the positional relationship between the cylinder and the fluid pressure cylinder is arranged in a state close to each other in the direction orthogonal to the cylinder center line, the device can be made compact in shape.
  • the device since the device has a symmetrical structure centered on the guide rod, if two fluid pressure cylinders are operated, the guide rod slides straight on the center line of the cylinder by connecting the bracket. Therefore, the cooling water can be stably sucked into the inside of the cylinder, and the load of the movable part of the device can be reduced, thereby preventing malfunction of the device.
  • FIG. 1 is a schematic structural view of a spot welding machine to which a cooling water fall prevention device according to an embodiment of the present invention is connected.
  • FIG. 2 is a perspective view of a cooling water fall prevention device according to an embodiment of the present invention.
  • Fig. 3 is a cross-sectional view taken along line III-III in Fig. 2.
  • FIG. 4 corresponds to FIG. 3 and shows a state in which cooling water is sucked into the cylinder.
  • FIG. 5 is a schematic view of a spot welding machine to which a conventional cooling water fall prevention device is connected.
  • FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 5.
  • Cooling water anti-fall device 2. Welding torch; 3. Electrode; 5. Barrel, 5b, guide hole; 5c, guide rod; 5d, separator; 6, cylinder (fluid pressure cylinder); 6a, piston Rod; 9, connecting bracket; 10, spot welding machine; 11, shut-off valve; 41, cooling water passage; C1, cylinder centerline; S1, cooling water passage side space; S2, guide hole side space.
  • FIG. 1 shows a spot welding machine 10 to which a cooling water fall prevention device 1 according to an embodiment of the present invention is connected.
  • This spot welding machine 10 is used to assemble a plurality of pressed parts (not shown) by spot welding in, for example, an automobile production line, and includes a welding gun 2 that is approximately C-shaped when viewed from the front.
  • a pair of thin rod-shaped handles 2a facing each other, and the portion of the welding torch 2 on the side of one handle 2a may be close to and away from the other handle 2a.
  • An electrode 3 having a substantially bell shape viewed from the front is detachably attached to the tip of each shank 2a, and the welding torch 2 is attached to one shank while the welding target (not shown) is arranged between the two electrodes 3
  • the part on the 2a side is close to the other shank 2a, and the electrode to be welded is sandwiched between the two electrodes 3, and a current flows between the two electrodes 3 to spot weld the object to be welded.
  • a cooling unit 4 for cooling the two electrodes 3 is connected to the welding gun 2.
  • the cooling unit 4 includes a unit body 40 and a cooling water passage 41.
  • the unit body 40 has a pump 40a for circulating cooling water and a tank 40b for storing cooling water.
  • the cooling water passage 41 has a unit extending from the unit body 40 to each electrode 3 the first pipe 41a and the second pipe 41b extending from each electrode 3 to the unit body 40, the cooling unit 4 through the operation of the pump 40a, the cooling water in the storage tank 40b via the first pipe 41a and the second pipe 41b
  • the inside of each electrode 3 circulates to cool each electrode 3.
  • the cooling water fall prevention device 1 is provided in the middle portion of the first duct 41 a, and includes a cylindrical body 5 having a substantially cylindrical shape extending in the up-down direction of the cylinder center line C1, and A pair of cylinders 6 (fluid pressure cylinders) provided in the cylinder body 5 in a direction orthogonal to the cylinder center line C1.
  • a connecting hole 5 a communicating with the inside of the cylindrical body 5 is formed in the center of one end of the cylindrical body 5, and the connecting hole 5 a is connected to a T-shaped pipe 42 that constitutes a part of the first pipe 41 a.
  • the one end opening portion of the cylindrical body 5 is connected to the cooling water passage 41.
  • a shut-off valve 11 that can stop the circulation of the cooling water in the cooling water passage 41 is connected to the upstream side of the T-shaped pipe 42.
  • a guide hole 5b communicating with the inside of the cylinder 5 is formed in the center of the other end of the cylinder 5, and the guide hole 5b is slidably inserted in the cylinder centerline Guide rod 5c extending on C1.
  • a disc-shaped partition plate 5d that divides the inside of the barrel body 5 into a space S1 on the side of the cooling water passage 41 and a space S2 on the side of the guide hole 5b is disposed inside the barrel 5, and the center axis of the partition 5d
  • the cylinder center line C1 coincides, and the center of the partition 5d is connected to one end of the guide rod 5c.
  • a ring-shaped rubber sealing body 5e is attached to the outer peripheral portion of the separator 5d, and this sealing body 5e seals between the separator 5d and the inner peripheral surface of the cylindrical body 5.
  • the partition plate 5d makes the sealing body 5e slidingly contact with the inner peripheral surface of the cylinder body 5 and slides along the cylinder center line C1, changing the partition position inside the cylinder body 5 .
  • the two cylinders 6 have the same capability, and are arranged so as to sandwich the cylinder 5 at a position close to the cylinder 5 and symmetrically arranged with the cylinder 5 as the center.
  • each cylinder 6 is arranged such that the piston rod 6a expands and contracts along the cylinder center line C1 toward the side opposite to the cooling water passage 41.
  • the first supply and exhaust portion 6b and the second supply and exhaust portion 6c are provided on both sides of the main body portion of each cylinder 6 in the longitudinal direction, and the first supply and exhaust portion 6b and the second supply and exhaust portion 6c become Compressed air is supplied to each cylinder 6 and a portion that discharges compressed air from each cylinder 6.
  • a strip-shaped fixing plate extending in the direction in which the cylinder 5 and the two cylinders 6 are juxtaposed is arranged 8.
  • the cylinder 5 is fixed to the central portion of the fixing plate 8 in the longitudinal direction, and each cylinder 6 is fixed to both sides of the fixing plate 8 in the longitudinal direction, thereby integrating the cylinder 5 and the two cylinders 6.
  • a first fitting hole 8a is formed through the center of the fixing plate 8 in the longitudinal direction.
  • a first guide bush 8b is fitted into the first fitting hole 8a, and a guide rod 5c is slidably inserted into the first guide bush 8b.
  • second fitting holes 8c are formed through both sides of the fixing plate 8 in the longitudinal direction.
  • the second guide bushes 8d are fitted into the second fitting holes 8c, respectively, and the piston rod 6a of each cylinder 6 is slidably inserted into each second guide bush 8d.
  • a plate-shaped connection bracket 9 is provided which is opposite to the fixing plate in a direction orthogonal to the cylinder center line C1 8 extends in parallel, and is arranged at a predetermined interval from the fixing plate 8.
  • the other end of the guide rod 5c is fixed to the center portion of the connecting bracket 9 in the longitudinal direction, and the front ends of the piston rods 6a of the cylinders 6 are fixed to one end and the other end of the connecting bracket 9, respectively.
  • the connecting bracket 9 is connected to the other end of the guide rod 5c and the front end of each piston rod 6a.
  • each electrode 3 attached to the front end of the welding gun 2 (each handle 2a) when removing the electrode 3 from the front end of the welding gun 2
  • the shut-off valve 11 is used to circulate the cooling water in each electrode 3 Stop, and supply compressed air to each cylinder 6 via the first air duct 7a and discharge air from the cylinder 6 via the second air duct 7b to extend each piston rod 6a.
  • the guide rod 5c and The partition 5d slides away from the cooling water passage 41.
  • each piston rod 6a As shown in FIG. 3, the guide rod 5c and the separator 5d slide close to the cooling water passage 41 and return to the original position. Then, if the stop valve 11 stops the cooling water circulation, the spot welding machine 10 can perform spot welding. status.
  • the sealing body 5e of the separator 5d inside the cylinder 5 is deteriorated due to the repeated operation of the cooling water fall prevention device 1, the distance between the separator 5d and the inner circumferential surface of the cylinder 5 The air-tightness between the two disappears, and the cooling water infiltrates into the space S2 on the side of the guide hole 5b inside the cylinder 5. Since the cylinder 6 is separated from the cylinder 5, the cooling water does not infiltrate into the cylinder 6. Therefore, it is possible to reliably prevent the cooling water from dripping from the front end of the welding gun 2 during the replacement operation of the electrode 3, and to prevent the failure of the cooling water fall prevention device 1 caused by the cylinder 6 due to repeated operations.
  • the cooling water fall prevention device 1 can be made compact in shape.
  • the cooling water fall prevention device 1 has a symmetrical structure centered on the guide rod 5c, when the two cylinders 6 operate, the guide rod 5c slides straight on the cylinder center line C1 of the cylinder 5 by the connecting bracket 9. Therefore, the cooling water can be stably sucked into the inside of the cylinder 5, and the load of the movable part of the cooling water fall prevention device 1 can be reduced, and the malfunction of the cooling water fall prevention device 1 can be prevented.
  • a pair of cylinders 6 are provided on both sides of the cylinder 5, but it may be a structure in which only one cylinder 6 is provided on the side of the cylinder 5, or it may be a cylinder A structure in which three or more cylinders 6 are provided on the side of 5.
  • each cylinder 6 is provided at a position close to the cylindrical body 5, but it may be configured to provide each cylinder 6 at a position away from the cylindrical body 5.
  • each cylinder 6 is symmetrically arranged with the guide rod 5c of the cylinder 5 as the center, but the position of each cylinder 6 may also be asymmetrically arranged with the guide rod 5c of the cylinder 5 as the center.
  • the cylinder 6 is used as the fluid pressure cylinder, but an oil pressure cylinder may be used as the fluid pressure cylinder.
  • the invention is suitable for a cooling water fall prevention device which is connected to a spot welding machine and prevents the cooling water for cooling the electrode from the front end of the welding gun when the electrode is removed from the front end of the welding gun during the electrode replacement operation Dripping.

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

Abstract

一种用于连接至点焊机上的冷却水防落装置，所述冷却水防落装置(1) 包括筒体(5)，所述筒体(5)的一端开口部分与冷却水通路(41)连接，另一端中央具有导孔(5b)。在与筒体(5)的筒中心线(C1)正交的方向上并设有活塞杆(6a)沿着筒中心线(C1)伸缩的气缸(6)。在筒体(5)的内部配设有隔板(5d)和导杆(5c)，隔板(5d)将筒体(5)的内部分隔成冷却水通路(41)侧的空间(S1)和导孔(5b)侧的空间(S2)，并将筒体(5)的内周面之间密封，导杆(5c)在筒中心线(C1)上延伸，并且可滑动接触地嵌插在导孔(5b)内，一端与隔板(5d)连接，导杆(5c)的另一端侧设置有将导杆(5c)的另一端与活塞杆(6a)的前端连接的支架(9)。该冷却水防落装置可防止冷却水从焊枪前端滴落，即使反复进行电极的更换操作，气缸也不会发生故障。

Description

冷却水防落装置 技术领域
本发明涉及一种冷却水防落装置，该冷却水防落装置与点焊机连接，在电极的更换操作中将电极从焊枪的前端取下时，不让用于冷却电极的冷却水从焊枪的前端滴落。
背景技术
以往，例如专利文献1(JPA2014-14843)中公开了在点焊机中焊枪的前端(shank)可装卸地安装有在焊接时与焊接对象接触进行加压和通电的电极，该电极若达到高温而变形则会影响焊接部的质量，因此通常具有通过使冷却水经由焊枪在电极内部循环，即使反复进行焊接操作电极也不会达到极度高温的结构。
然而，上述电极若反复进行焊接操作则其前端面会附着氧化被膜，因此为了使焊接部的质量稳定，定期进行将电极前端面切削以除去氧化被膜的操作。这样一来，电极的总长度会逐渐缩短，因此需要在规定时间进行电极的更换操作。该电极的更换操作通过将冷却水通路中设置的截止阀关闭以停止冷却水的循环之后，将安装在焊枪前端的用完的电极拆下并将新电极安装在焊枪前端而完成，但是存在将用完的电极从焊枪前端拆下时，积存在部分冷却水通路中的冷却水从焊枪前端的开口部分滴落而淋湿操作员的身体或其他设备等的问题。
为了解决此问题，例如已知图5和图6所示的将冷却水防落装置1A安装在点焊机10A上的方案。上述冷却水防落装置1A包括筒体5A，该筒体5A的一端开口连接至冷却水通路41A，而另一端开口部分连接至气缸6A且被该气缸6A覆盖。气缸6A的活塞杆6B沿着筒体5A的筒中心线c1朝向筒体5A的内部伸缩。在活塞杆6B的前端安装有隔板5B，该隔板5B将筒体5A的内部沿着筒中心线c1分隔成冷却水通路41A侧空间s1和气缸6A侧空间s2，在该隔板5B的外周部分设置有将该隔板5B与筒体5A的内周面之间密封的环状密封体5C。而且，将电极3A从焊枪2A的前端拆下时，由设置在冷却水通路41A中的截止阀11A使冷却单元4A的冷却水停止循环，并且使气缸6A中的活塞杆6B收缩，从而使筒体5A内部的冷却水通路41A侧空间s1成为负压，由此将冷却水通路41A的冷却水吸入冷却水通路41A侧空间s1内，不让冷却 水从焊枪2A前端的开口部分滴落。
然而，在图5和图6所示的冷却水防落装置1A的情况下，每次进行电极3A的更换操作时装置反复工作，则安装在筒体5A内部的隔板5B上的密封体5C由于与筒体5A内周面的滑动接触动作而磨损，逐渐劣化，因此隔板5B与筒体5A内周面之间气密性消失，冷却水浸入筒体5A内部的气缸6A侧空间s2中，进而有可能由于浸入筒体5A内部的气缸6A侧空间s2中的冷却水而使气缸6A发生故障。
发明内容
本发明是鉴于上述各点而完成的，其目的在于提供一种能够在电极的更换操作中可靠地防止冷却水从焊枪前端滴落，而且即使反复进行电极的更换操作也不会发生故障的用于点焊机的冷却水防落装置。
为了实现上述目的，本发明的特征在于，使从冷却水通路中将冷却水吸入内部的筒体与流体压气缸(fluid pressure cylinder)分隔开。
具体而言，冷却水防落装置连接在点焊机上，该点焊机具有前端可装卸地安装有电极的焊枪，使冷却水经由延伸至该焊枪上设置的上述电极的冷却水通路而在上述电极内部循环，上述冷却水防落装置构成为，将上述焊枪的前端安装的上述电极拆下时，在利用设置于上述冷却水通路中的截止阀使上述电极内部的冷却水的循环停止的状态下，将积存于上述冷却水通路中的一部分或全部冷却水吸入以防止冷却水从上述焊枪的前端滴落，该冷却水防落装置采用以下解决方案。
即，在第一方面的发明中，其特征在于，冷却水防落装置包括：一端开口与上述冷却水通路连接而另一端中央具有导孔的筒体、以及在与该筒体的筒中心线正交的方向上并设在上述筒体上且活塞杆沿着上述筒中心线伸缩的一个以上的流体压气缸，在上述筒体的内部配设有隔板和导杆，该隔板将该筒体的内部分隔成冷却水通路侧空间和导孔侧空间，并且将上述筒体的内周面之间密封，该导杆在上述筒中心线上延伸，并且可滑动接触地嵌插在上述导孔中，上述导杆的一端与上述隔板连接，在该导杆的另一端侧设置有将该导杆的另一端与上述活塞杆的前端连接的连结支架。
第二方面的发明是在第一方面的发明中，其特征在于，上述气缸在与筒中 心线正交的方向上并设于靠近上述筒体的位置，并且配置成上述活塞杆朝向与上述冷却水通路相反的一侧伸缩。
第三方面的发明是在第二方面的发明中，其特征在于，上述气缸配设为相同种类的一对气缸，一对上述气缸夹着上述筒体以该筒体为中心对称设置，上述连结支架呈在与上述筒中心线正交的方向上延伸的条板状，上述导杆的另一端固定在上述连结支架的长度方向中央部分，一对上述气缸的活塞杆前端分别固定在上述连结支架的长度方向一端和另一端。
在第一方面的发明中，即使因装置的反复工作导致筒体内部的隔板的密封部分劣化而使隔板与筒体内周面之间的气密性消失，进而导致冷却水浸入筒体内部的导孔侧空间内，由于流体压气缸与筒体分隔开，所以冷却水也不会浸入气缸内部。因此，能够可靠地防止电极的更换操作中冷却水从焊枪的前端滴落，并防止因反复工作而由流体压气缸引起的装置故障。
在第二方面的发明中，由于筒体和流体压气缸的位置关系为以在与筒中心线正交的方向上彼此靠近的状态排列，因此可以使装置的形状紧凑。
在第三方面的发明中，由于装置为以导杆为中心的对称结构，因此若两个流体压气缸工作，则通过连结支架使导杆在筒体的筒中心线上笔直地滑动。因此，能够稳定地将冷却水吸入筒体内部，并能够减少装置的可动部分的负荷，防止装置的故障。
附图说明
图1是连接有本发明的实施方式所涉及的冷却水防落装置的点焊机的结构示意图。
图2是本发明的实施方式所涉及的冷却水防落装置的立体图。
图3是图2中III-III线的剖视图。
图4对应于图3，示出将冷却水吸入筒体内部的状态。
图5是连接有现有的冷却水防落装置的点焊机的示意图。
图6是图5中VI-VI线的剖视图。
图中，1、冷却水防落装置；2、焊枪；3、电极；5、筒体、5b、导孔；5c、导杆；5d、隔板；6、气缸(流体压气缸)；6a、活塞杆；9、连结支架；10、点 焊机；11、截止阀；41、冷却水通路；C1、筒中心线；S1、冷却水通路侧空间；S2、导孔侧空间。
具体实施方式
以下，根据附图对本发明的实施方式进行详细说明。应予说明，以下优选实施方式的说明本质上仅为示例。
图1示出连接有本发明的实施方式所涉及的冷却水防落装置1的点焊机10。该点焊机10用于在例如汽车生产线中通过点焊装配多个压制部件(未图示)，包括从正面看呈近似C字形的焊枪2。
在该焊枪2的前端设置有彼此相对的一对呈细棒状的柄2a，焊枪2上一个柄2a侧的部分可以靠近、远离另一个柄2a。
在各柄2a的前端可装卸地安装有从正面看呈近似吊钟状的电极3，在将焊接对象(未图示)配置在两个电极3之间的状态下，使焊枪2上一个柄2a侧的部分靠近另一个柄2a，由两个电极3夹着焊接对象进行加压后，使电流流过两个电极3之间，从而对焊接对象进行点焊。
在焊枪2上连接有冷却上述两个电极3的冷却单元4。
该冷却单元4包括单元本体40和冷却水通路41，单元本体40具有使冷却水循环的泵40a和储存冷却水的贮罐(tank)40b，冷却水通路41具有从该单元本体40延伸至各电极3的第一管道41a和从各电极3延伸至单元本体40的第二管道41b，冷却单元4通过泵40a的工作，使贮罐40b中的冷却水经由第一管道41a和第二管道41b在各电极3的内部循环而对该各电极3进行冷却。
如图2所示，冷却水防落装置1设置在第一管道41a的中间部分，包括筒中心线C1在上下方向上延伸的呈近似圆筒状的筒体5、以及在与该筒体5的筒中心线C1正交的方向上并设在筒体5上的一对气缸6(流体压气缸)。
如图3所示，在筒体5的一端中央形成有与该筒体5的内部连通的连接孔5a，该连接孔5a与构成第一管道41a的一部分的T字型管道42连接。
即，筒体5的一端开口部分与冷却水通路41连接。
如图1和图2所示，在T字型管道42的上游侧连接有可使冷却水通路41中冷却水的循环停止的截止阀11。
另一方面，如图3所示，在筒体5的另一端中央形成有与该筒体5的内部 连通的导孔5b，在该导孔5b内可滑动接触地嵌插有在筒中心线C1上延伸的导杆5c。
在筒体5的内部配设有将该筒体5的内部分隔成冷却水通路41侧空间S1和导孔5b侧空间S2的呈圆板状的隔板5d，该隔板5d的中心轴与筒中心线C1一致，隔板5d的中央与导杆5c的一端连接。
在隔板5d的外周部分安装有呈环状的橡胶制密封体5e，该密封体5e将隔板5d与筒体5的内周面之间密封。
而且，如果导杆5c在筒中心线C1上滑动，则隔板5d使密封体5e与筒体5的内周面滑动接触并沿着筒中心线C1滑动，改变筒体5的内部的分隔位置。
两个气缸6具有同种能力，配设成分别在靠近筒体5的位置上夹着该筒体5且以筒体5为中心对称设置。
另外，各气缸6配置成活塞杆6a朝向与冷却水通路41相反的一侧沿着筒中心线C1伸缩。
如图2所示，在各气缸6本体部分的长度方向两侧分别设置有第一供排部6b和第二供排部6c，该第一供排部6b和第二供排部6c成为将压缩空气供给到各气缸6以及将压缩空气从各气缸6排出的部分。
如果经由与各第一供排部6b连接的第一空气管道7a向气缸6内部供给压缩空气，并且经由与各第二供排部6c连接的第二空气管道7b从气缸6内部排出空气，则活塞杆6a伸长。另一方面，如果经由与各第二供排部6c连接的第二空气管道7b向气缸6内部供给压缩空气，并且经由与各第一供排部6b连接的第一空气管道7a从气缸6内部排出空气，则活塞杆6a收缩。
如图3所示，在筒体5和两个气缸6的与冷却水通路41相反的一侧配设有在筒体5和两个气缸6并设的方向上延伸的条板状的固定板8。
筒体5固定在该固定板8的长度方向中央部分，而各气缸6分别固定在固定板8的长度方向两侧部，由此使筒体5和两个气缸6成为一体。
在固定板8的长度方向中央贯通形成有第一嵌合孔8a。在该第一嵌合孔8a中嵌合有第一导套(guide bush)8b，导杆5c可滑动地嵌插在该第一导套8b内。
另一方面，在固定板8的长度方向两侧分别贯通形成有第二嵌合孔8c。在该第二嵌合孔8c中分别嵌合有第二导套8d，各气缸6的活塞杆6a可滑动 地嵌插在在各第二导套8d内。
在固定板8的与筒体5和各气缸6相反的一侧设置有条板状的连结支架(connection bracket)9，该连结支架9在与筒中心线C1正交的方向上相对于固定板8平行延伸，从固定板8隔开规定间隔设置。
导杆5c的另一端固定在连结支架9的长度方向中央部分，而各气缸6的活塞杆6a的前端分别固定在连结支架9的长度方向一端和另一端。
也就是说，连结支架9与导杆5c的另一端和各活塞杆6a的前端相连。
而且，在更换安装于焊枪2的前端(各柄2a)的各电极3时将该各电极3从焊枪2的前端拆下之际，如果利用截止阀11使冷却水在各电极3中的循环停止，而且经由第一空气管道7a向各气缸6内部供给压缩空气并经由第二空气管道7b从气缸6内部排出空气而使各活塞杆6a伸长，则如图4所示，导杆5c和隔板5d滑动离开冷却水通路41。由此，积存在冷却水通路41中的一部分或全部冷却水被吸入筒体5的内部，因此即使从焊枪2的前端将各电极3拆下，也能防止冷却水从焊枪2的前端滴落。
另一方面，在焊枪2的前端安装新的电极3之后，如果经由第二空气管道7b向各气缸6内部供给压缩空气并经由第一空气管道7a从气缸6内部排出空气而使各活塞杆6a收缩，则如图3所示，导杆5c和隔板5d滑动靠近冷却水通路41而返回原位，然后，如果解除截止阀11对冷却水循环的停止，则成为可由点焊机10进行点焊的状态。
综上所述，根据本发明的实施方式，即使因冷却水防落装置1的反复工作导致筒体5内部的隔板5d的密封体5e劣化而使隔板5d与筒体5的内周面之间的气密性消失，进而导致冷却水浸入筒体5内部的导孔5b侧空间S2内，由于气缸6与筒体5分隔开，所以冷却水也不会浸入气缸6内部。因此，能够可靠地防止电极3的更换操作中冷却水从焊枪2的前端滴落，并防止因反复工作而由气缸6引起的冷却水防落装置1的故障。
另外，由于筒体5和气缸6的位置关系为以在与筒中心线C1正交的方向上彼此靠近的状态排列，因此可以使冷却水防落装置1的形状紧凑。
进而，由于冷却水防落装置1为以导杆5c为中心的对称结构，因此若两个气缸6工作，则通过连结支架9使导杆5c在筒体5的筒中心线C1上笔直地滑动。因此，能够稳定地将冷却水吸入筒体5的内部，并能够减少冷却水防落 装置1的可动部分的负荷，防止冷却水防落装置1的故障。
应予说明，在本发明的实施方式中，在筒体5的两侧设置有一对气缸6，但也可以是只在筒体5的侧方设置一个气缸6的结构，还可以是在筒体5的侧方设置三个以上气缸6的结构。
另外，在本发明的实施方式中，各气缸6并设于靠近筒体5的位置，但也可以是将各气缸6设置在离开筒体5的位置的结构。
另外，在本发明的实施方式中，各气缸6以筒体5的导杆5c为中心对称设置，但各气缸6的位置也可以以筒体5的导杆5c为中心非对称地设置。
另外，在本发明的实施方式中，使用气缸6作为流体压气缸，但也可以使用油压气缸作为流体压气缸。
-产业上的可利用性-
本发明适合于冷却水防落装置，该冷却水防落装置连接在点焊机上，在电极的更换操作中将电极从焊枪的前端拆下时，不让用于冷却电极的冷却水从焊枪的前端滴落。

Claims (3)

  1. 一种冷却水防落装置，其连接在点焊机上，所述点焊机具有前端可装卸地安装有电极的焊枪，使冷却水经由延伸至该焊枪上设置的所述电极的冷却水通路而在所述电极内部循环，所述冷却水防落装置构成为，将所述焊枪的前端安装的所述电极拆下时，在利用设置于所述冷却水通路中的截止阀使所述电极内部的冷却水的循环停止的状态下，将积存于所述冷却水通路中的一部分或全部冷却水吸入以防止冷却水从所述焊枪的前端滴落，其特征在于，
    所述冷却水防落装置包括：一端开口与所述冷却水通路连接而另一端中央具有导孔的筒体、以及在与该筒体的筒中心线正交的方向上并设在所述筒体上且活塞杆沿着所述筒中心线伸缩的一个以上的流体压气缸，
    在所述筒体的内部配设有隔板和导杆，所述隔板将该筒体的内部分隔成冷却水通路侧空间和导孔侧空间，并且将所述筒体的内周面之间密封，所述导杆在所述筒中心线上延伸，并且可滑动接触地嵌插在所述导孔中，所述导杆的一端与所述隔板连接，
    在所述导杆的另一端侧设置有将该导杆的另一端与所述活塞杆的前端连接的连结支架。
  2. 根据权利要求1所述的冷却水防落装置，其特征在于，
    所述气缸在与所述筒中心线正交的方向上并设于靠近所述筒体的位置，并且配置成所述活塞杆朝向与所述冷却水通路相反的一侧伸缩。
  3. 根据权利要求2所述的冷却水防落装置，其特征在于，
    所述气缸配设为相同种类的一对气缸，一对所述气缸夹着所述筒体以该筒体为中心对称设置，
    所述连结支架呈在与所述筒中心线正交的方向上延伸的条板状，所述导杆的另一端固定在所述连结支架的长度方向中央部分，一对所述气缸的活塞杆前端分别固定在所述连结支架的长度方向一端和另一端。
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