JPH0629780U - Pressure arm unit for stationary resistance spot welder - Google Patents

Abstract

(57) [Summary] [Object] To provide a pressure arm unit for using a conventional direct pressure type stationary spot resistance welding machine as a rocker arm type stationary spot resistance welding machine. [Structure] A feed link 6 is attached to a feed arm 5 attached to a ram 1a of a pressurizing cylinder 1 of a direct pressure type stationary spot welding machine, and an intermediate portion of an upper electrode holder arm 9 is provided by a feed link 6 and an arm bracket 8. Of the upper electrode holder arm 9, the base of the upper electrode holder arm 9 is pivotally attached to the support bracket 3 by the support pin 4, and the upper electrode tip holder 11 at the tip of the upper electrode holder arm 9 is moved downward by the ram 1a. Lower electrode tip holder 1 at the tip of the holder arm 10
2 is a pressure arm unit of a stationary resistance spot welding machine for contacting and pressing a member to be welded for thin plate structure mounted on No. 2;

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a pressure arm unit for using the direct pressure type of the resistance spot welding machine as a rocker arm type spot welding machine, and is used for welding thin plates of 2 to 3 mm or less, for example, sheet metal box welding. It is a pressure arm unit.

[0002]

[Prior art]

 There are two types of conventional stationary spot welders, a direct pressure type and a rocker arm type, and users are equipped with two types of equipment depending on the application. However, when using a direct pressure type machine to lengthen the arm and use it like a rocker arm welder, the capacity will be greatly reduced. As shown in FIGS. 1 and 2, a general direct pressurization type structure is a system in which a force is applied to an electrode tip d via a guide f by a pressurizing cylinder, but as a disadvantage, this type of machine is The distance l between the guide f and the electrode tip d is about several mm. If the length L is set to several tens of millimeters, strength of the guide f, looseness of the electrode tip portion, insufficient pressurization due to deterioration of pressurization efficiency, and the like are disadvantageous in that sufficient performance cannot be exhibited.

[0003]

[Problems to be solved by the device]

 An object of the present invention is to provide a pressure arm unit of a stationary resistance spot welder, which can be used as a rocker arm type spot welder in a direct pressure resistance spot welder without the conventional drawbacks.

[0004]

[Means for Solving the Problems]

 The present invention is a direct resistance type stationary resistance spot equipped with a pressurizing cylinder 1, a pressurizing ram 1a operated by a pressurizing fluid of the pressurizing cylinder 1, and a power feeding arm 5 attached to the pressurizing ram 1a. In the welding machine, an arm bracket 8 suspended from a power supply arm 5 by a power supply link 6, a base part is pivotally attached to a support bracket 3 of the upper horn 2a, an intermediate part is supported by the arm bracket 8, and a tip part is provided. It comprises an upper electrode holder arm 9 having an upper electrode chip holder 11 and a lower electrode holder arm 10 having a lower electrode tip holder 12 projecting from a lower horn 10a facing the upper electrode tip holder 11. This is the structure of the pressure arm unit of the stationary resistance spot welding machine, which is characterized in that

[0005]

[Action]

 The upper electrode tip holder 11 is attached to the feeding arm 5 of the pressurizing ram 1a of the pressurizing cylinder 1 so as to face the lower electrode tip holder 12 of the lower electrode holder arm 10, and the pressurizing ram 1a is pushed down to move the upper electrode tip holder. A member to be welded for thin plate structure is sandwiched between 11 and the lower electrode tip holder 12 to supply electric power to be used as a stationary direct pressure welding machine. When the tip of the upper electrode tip holder 11 is at a distance L farther than the power feeding arm 5, that is, in order to use it as a rocker arm type welding machine, the base of the upper electrode holder arm 9 is supported on the support bracket 3. The upper electrode holder arm 9 is pivotally attached to the pin 4, the intermediate portion of the upper electrode holder arm 9 is attached to the power feeding arm 5 by the arm bracket 8 and the power feeding link 6, and the upper electrode tip holder 11 is attached to the tip of the upper electrode holder arm 9. It is attached and used so as to face the lower electrode tip holder 12 of the lower electrode holder arm 10.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. A pressure cylinder 1 is provided above the pressure guide 2. Reference numeral 1a is a pressurizing ram of a pressurizing cylinder 1 which is inserted through a pressurizing guide 2 of an upper horn 2a of a welding machine A so as to advance and retreat, and 3 is an upper electrode whose base end is pivotally supported by a fulcrum pin 4. The support brackets 5 of the holder arm 9 are power supply arms vertically provided on the pressure guide 2, and the arm brackets 8 of the upper electrode holder arm 9 are suspended from the power supply arms 5 by power supply links 6. Reference numeral 11 is an upper electrode chip holder disposed at the tip of the upper electrode holder arm 9, and 10 is a lower electrode holder arm projectingly provided on the lower horn 10a of the welding machine A, and a lower electrode tip is provided at the tip thereof. A holder 12 is provided. INDUSTRIAL APPLICABILITY The present invention is configured so that even if a stationary resistance spot welding machine of a general direct pressure type is used as a rocker arm type spot welding machine, it is constructed efficiently so as not to cause insufficient pressurizing force. The two types of spot welding, the rocker arm method and the rocker arm method, can also be used as a single direct pressure type spot welding machine. That is, when used as a direct pressure type stationary spot welding machine, as shown in FIG. 4, the upper electrode tip holder 11 is directly attached to the feeding arm 5 and the upper electrode holder arm 9. Further, when used as a rocker arm type stationary spot welding machine, as shown in FIG. 3, the upper end of the power feeding link 6 is axially attached to the power feeding arm 5, and the upper electrode holder arm is attached to the support bracket 3 attached to the upper horn 2a. The base portion of 9 is pivotally attached by the fulcrum pin 4, and the arm bracket 8 attached to the lower end portion of the feed link 6 at the middle portion of the upper electrode holder arm 9 is pivotally attached by the feed pin 7. The upper electrode tip holder 11 is attached to the tip of the.

Further, the lower electrode tip holder 12 is attached to the tip of the lower electrode holder arm 10 of the welding machine A so as to face the upper electrode tip holder 11. Therefore, in order to operate the pressurizing cylinder 1 to descend the pressurizing ram 1a to descend the upper electrode holder arm 9 from the position of the phantom line in FIG. 1 to the position of the solid line in FIG. As shown in the figure, the strength of the pressure guide is not reduced, the electrode tip is loose, and the efficiency of pressurization is not deteriorated.

[0008]

[Effect of device]

 As described above, the present invention (1) improves the function by adding the rocker arm unit, and is able to obtain the functions of two models, and (2) the existing stationary direct contact pressure resistance spot welding machine. Can also be added easily. Moreover, (3) it is compact and easy to install because it has a built-in power supply. Also, (4) the stationary direct pressure welding machine can be used also as the rocker arm welding machine, and (5) the functions of the stationary direct pressure welding machine can be used as they are (pressurization, timer, power supply, etc.). ), A rocker arm system is available, and this unit has the effect of (6) transmitting pressure, holding the holder arm, and combining the functions of the secondary conductor.

[Brief description of drawings]

FIG. 1 is a front view of a stationary spot welding machine of a direct pressure type, which is shown with a part cut away.

FIG. 2 is a front view of a rocker arm type electrode holder arm.

FIG. 3 is a partially cutaway front view of a rocker arm type spot welder using a direct pressure type stationary spot welder.

FIG. 4 is a front view in which a part of a conventional direct pressure type stationary spot welding machine is cut away.

[Explanation of symbols]

 A Welder 1 Pressurizing cylinder 1a Pressurizing ram for pressurizing cylinder 2 Pressurizing guide 2a Upper horn 3 Support bracket 4 Support point pin 5 Feeding arm 6 Feeding link 7 Feeding pin 8 Arm bracket 9 Upper electrode holder arm 10 Lower electrode holder arm 10a Lower horn 11 Upper electrode tip holder 12 Lower electrode tip holder

Claims (1)

[Scope of utility model registration request] 1. A pressurizing cylinder 1, a pressurizing ram 1a operated by a pressurizing fluid of the pressurizing cylinder 1, and a pressurizing ram 1
In a direct pressure type stationary resistance spot welder equipped with a power feeding arm 5 attached to a, an arm bracket 8 attached to the power feeding arm 5 by a power feeding link 6.
An upper electrode holder arm 9 having a base portion pivotally attached to a support bracket 3 of the upper horn 2a, an intermediate portion supported by an arm bracket 8, and an upper electrode tip holder 11 disposed at a tip portion; and an upper electrode tip holder. 11. A pressure arm unit structure of a stationary resistance spot welding machine, which comprises a lower electrode holder arm 10 which is provided to project from a lower horn 10a so as to face 11 and a lower electrode tip holder 12 is arranged.