CN-116806181-B - Coolant drip prevention system

Abstract

In the coolant drip prevention system (1), one end of a first pipe (4) is connected to a coolant supply pipe (15) on the side of a welding gun (11) with respect to a first shut-off valve (2). One end of the second pipe (5) is connected to a coolant discharge pipe (16) on the side of the welding torch (11) with respect to the second shut-off valve (3). One end of the discharge pipe (6) is connected to a coolant discharge pipe (16) on the side remote from the welding torch (11) with respect to the second shut-off valve (3). The pump unit (7) discharges the coolant sucked from the first pipe (4) and the second pipe (5) into the discharge pipe (6).

Inventors

• KUSANO HIROKAZU

Assignees

• 极动焊接机械有限公司

Dates

Publication Date

20260508

Application Date

20211217

Priority Date

20210120

Claims (1)

1. 1. A coolant anti-drip system for preventing coolant circulated into an electrode through a coolant supply passage and a coolant discharge passage from dripping from a tip of a welding torch in a spot welding machine when the electrode is removed from the tip of the welding torch, the coolant anti-drip system comprising: a first shut-off valve at an intermediate position along the coolant supply passage to stop supply of the coolant into the electrode; A second shut-off valve at an intermediate position along the coolant discharge passage to stop discharge of the coolant from the electrode; A first pipe having a first end connected to a portion of the coolant supply passage closer to the welding gun than the first shut-off valve; A second pipe having a first end connected to a portion of the coolant discharge passage closer to the welding gun than the second shut-off valve; a discharge pipe having a first end connected to a portion of the coolant discharge passage farther from the welding gun than the second shut-off valve, and A pump unit connected to a second end of each of the first pipe, the second pipe, and the discharge pipe to suck coolant from the first pipe and the second pipe and discharge the sucked coolant into the discharge pipe, wherein, The pump unit includes a first connection pipe, a second connection pipe connecting a second end of the second pipe and a second end of the discharge pipe, a pair of first check valves connected in series at an intermediate position along the first connection pipe to guide a flow of a coolant inside the first connection pipe from the first pipe toward the discharge pipe, a partition plate, a guide rod, a fluid pressure cylinder, a first suction pipe, a second suction pipe, and a second suction pipe, the first connection pipe connecting a second end of the first pipe and a second end of the discharge pipe, the second connection pipe connecting a second end of the second pipe, the first check valves being connected in series at an intermediate position along the first connection pipe to guide a flow of a coolant inside the first connection pipe from the second pipe toward the discharge pipe, the partition plate dividing an inner space of the cylinder body into a first end with a guide hole, a second end with a guide hole, the first check valve being fitted between the first end and the first suction pipe and the second pipe at an intermediate position along the second connection pipe to guide rod, a first check valve being fitted between the first suction pipe and the second suction pipe and the first suction pipe connecting a second end with a guide hole, a second check valve being connected in series at an intermediate position along the second connection pipe to guide rod, a first check valve being fitted between the first suction pipe and the second suction pipe and the first suction pipe and the second suction pipe The fluid pressure cylinder is a double-acting cylinder and is configured to increase a first space and decrease a second space by extending a piston rod such that the diaphragm moves with a guide rod sliding in a first direction, and to decrease the first space and increase the second space by retracting the piston rod such that the diaphragm moves with a guide rod sliding in a second direction.

Description

Coolant drip prevention system Technical Field The present invention relates to a coolant drip prevention system. The coolant drip prevention system prevents coolant for an electrode from dripping from the tip of a welding gun when the electrode at the tip of the welding gun is removed for replacement in a spot welder. Background The welding gun in the spot welder includes an electrode at the tip. The electrode is replaced after a predetermined period of use. Replacement involves closing a shut-off valve on the coolant channel to stop the circulation of coolant, removing the used electrode from the tip of the torch, and attaching a new electrode to the tip of the torch. After removal of the electrode used, a portion of the coolant remaining in the coolant channel may drip through an opening at the tip of the torch. The dripping coolant may wet, for example, the body of the operator and other equipment. In this regard, the coolant drip-preventing device described in patent document 1 includes, for example, a tube body and a pair of fluid pressure cylinders. The cartridge body has an opening at one end and a guide hole at the center of the other end. The opening is connected with the coolant channel. A pair of fluid pressure cylinders are arranged in parallel in a direction perpendicular to the center line of the cylinder body. The cartridge body encloses a partition dividing an inner space of the cartridge body into a space closer to the coolant passage and a space closer to the guide hole, and a guide rod slidably fitted through the guide hole. The guide rod has one end connected to the diaphragm and the other end coupled to the piston rod in each fluid pressure cylinder with an engagement bracket. After the electrode is removed from the tip of the torch, a shut-off valve on the coolant channel is operated to stop the circulation of coolant circulated by the cooling unit. Then, the piston rod in each fluid pressure cylinder is elongated to generate a negative pressure in the space inside the cylinder body closer to the coolant passage. Coolant is drawn from the coolant channel into a space closer to the coolant channel and does not drip from an opening at the tip of the torch. Prior art literature Patent literature Patent document 1 WO 2020/087959 Disclosure of Invention Technical problem The coolant drip-preventing device described in patent document 1 cannot suck coolant in a volume exceeding a predetermined volume into a space inside the cylinder body. When used with, for example, a larger welding torch, the coolant drip guard may not be able to draw all of the coolant in the portion of the coolant channel closer to the welding torch than the shut-off valve into the cartridge body. In this case, the coolant may drip from the tip of the torch. In response to the foregoing, one or more aspects of the present invention are directed to a coolant anti-drip system for a spot welder that reliably prevents coolant from dripping from the tip of a welding gun during electrode replacement regardless of the size or type of equipment. Solution to the problem In response to the foregoing, a system according to one or more aspects of the present invention allows for replacement of an electrode when repeatedly sucking coolant from a coolant channel using a pump unit. More specifically, a coolant drip prevention system has a structure described below for preventing coolant circulated into an electrode through a coolant supply passage and a coolant discharge passage from dripping from a tip of a welding torch in a spot welding machine when the electrode is removed from the tip of the welding torch. The coolant anti-drip system according to the first aspect of the invention includes a first shut-off valve at an intermediate position along the coolant supply passage to stop the supply of coolant into the electrode, a second shut-off valve at an intermediate position along the coolant discharge passage to stop the discharge of coolant from the electrode, a first pipe having a first end connected to a portion of the coolant supply passage closer to the torch than the first shut-off valve, a second pipe having a first end connected to a portion of the coolant discharge passage closer to the torch than the second shut-off valve, a discharge pipe having a first end connected to a portion of the coolant discharge passage farther from the torch than the second shut-off valve, and a pump unit connected to a second end of each of the first pipe, the second pipe, and the discharge pipe to suck coolant from the first pipe and the second pipe and discharge the sucked coolant into the discharge pipe. The coolant drip prevention system according to a second aspect of the present invention is the coolant drip prevention system according to the first aspect of the present invention, wherein the pump unit includes a first connection pipe, a second connection pipe, a pair of first check valves, a pair of second check valves, a cylinder body,