KR101556983B1 - Welding tip change apparatus for spot welding - Google Patents

Abstract

A welding tip replacing apparatus for spot welding is disclosed. A welding tip replacing apparatus for spot welding according to an embodiment of the present invention includes: a base frame installed in a worksite provided with a spot welder having upper and lower welding guns; A mounting plate mounted on an upper end of the base frame; A welding tip removing unit installed on one side of the upper portion of the mounting plate for removing the worn welding tip mounted on the upper welding gun or the lower welding gun; A welding tip supply unit installed at an upper portion of the mounting plate at the rear of the welding tip removing unit, for supplying a new welding tip to be mounted to the tip of each welding gun; A welding tip feeding unit mounted on one side of the welding tip feeding unit, in which a plurality of new welding tips to be replaced with the upper and lower welding guns are loaded and the welding tips are inserted into the welding tip feeding units one by one; And a welding tip mounted on the front of the base frame in correspondence with the welding tip supplying unit and adapted to receive the welding tip from the welding tip supplying unit to mount the welding tip on the tip of the upper welding gun or the lower welding gun Unit.

Description

[0001] WELDING TIP CHANGE APPARATUS FOR SPOT WELDING [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding tip exchanging apparatus for spot welding, and more particularly, to a welding tip exchanging apparatus for spot welding that enables a new welding tip to be automatically exchanged when a welding tip mounted on a spot welding gun is worn will be.

Generally, during the assembly process of a vehicle body, spot resistance welding is widely used as a method of welding two panels. Such spot resistance welding forms electric resistance by applying pressure to the panel surface, Is an electric resistance welding.

The spot resistance welding is usually performed by a welding robot, and a spot welding gun is provided at the tip of the welding robot.

1, the spot welding gun includes a fixed electrode rod 1 (i.e., a holder) and a movable electrode rod 3 (i.e., a shank) And a welding gun driving device is provided so as to generate a pressing force for driving the movable electrode rod (3).

The welding tip 5 is fitted to the tip of the fixed electrode rod 1 and the movable electrode rod 3. The diameter of the tip of the welding tip 5 is, for example, 6 mm and the diameter of the other portion is about 16 mm .

The spot welding gun welds the two-panel panel 10 to be welded between the fixed electrode rod 1 and the movable electrode rod 3.

When the panel 10 is sandwiched between the movable electrode rod 1 and the fixed electrode rod 3 repeatedly as described above, the tip of the welding tip 5 is worn by pressure and heat, The welding tip (5) must be replaced periodically as welding failure will occur if it exceeds the allowable limit.

However, in the related art, when the welding tip 5 is replaced, a worker is manually replaced using a pipe wrench and a hammer, so that the replacement time is lengthened, resulting in deterioration in productivity and replacement failure.

In addition, when the worker directly enters the work line and exchanges the welding tip in the spot welding gun mounted on the robot, the worker is exposed to a great deal of risk. When the welding tip 5 is replaced by using the hammer, A partial breakage may occur or a position where the upper and lower welding guns are misaligned may occur.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art. Accordingly, it is an object of the present invention to provide a welding apparatus and a welding method for welding a welding tip mounted on upper and lower welding guns of a spot welding machine, To provide a welding tip supply device for spot welding that can shorten the time required for welding tip replacement and alignment and automate the replacement process.

According to an aspect of the present invention, there is provided an apparatus for exchanging a welding tip for spot welding, comprising: a base frame installed in a worksite provided with a spot welder having upper and lower welding guns; A mounting plate mounted on an upper end of the base frame; A welding tip removing unit installed on one side of the upper portion of the mounting plate for removing the worn welding tip mounted on the upper welding gun or the lower welding gun; A welding tip supply unit installed at an upper portion of the mounting plate at the rear of the welding tip removing unit, for supplying a new welding tip to be mounted to the tip of each welding gun; A welding tip feeding unit mounted on one side of the welding tip feeding unit, in which a plurality of new welding tips to be replaced with the upper and lower welding guns are loaded and the welding tips are inserted into the welding tip feeding units one by one; And a welding tip mounted on the front of the base frame in correspondence with the welding tip supplying unit and adapted to receive the welding tip from the welding tip supplying unit to mount the welding tip on the tip of the upper welding gun or the lower welding gun Wherein the welding tip detaching unit includes a detaching plate having one end protruding outwardly from an upper portion of the mounting plate and having a detachment hole formed at a protruding end thereof; A fixing block fixedly mounted on an upper surface of one end of the removal plate corresponding to the removal hole; A clamping block movably provided on the detachable plate with the detachment hole therebetween in correspondence with the fixed block; And a clamping cylinder mounted on the other end of the removal plate and connected to the clamping block.

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The fixing block may be formed with a support groove in which the welding tip is inserted and supported on one side surface corresponding to the removal hole.

The support grooves are formed along the height direction of the fixing block and are formed in a triangular shape in cross section, and a plurality of support protrusions may be formed along the height direction on the inner surface.

The clamping block may have a clamping groove formed along a height direction on a surface corresponding to the support groove.

The clamping groove may have a triangular shape in cross section, and a plurality of clamping projections may be integrally formed on the inner surface along the height direction.

The clamping cylinder may comprise a pneumatic cylinder whose working pressure is pneumatic or a hydraulic cylinder whose working pressure is hydraulic pressure.

Wherein the welding tip supply unit includes: an operating cylinder mounted on a rear side of the mounting plate; A connecting block in which a rear surface is mounted to an operating rod of the operating cylinder; A supply housing mounted on the connection block and having a through hole formed along a longitudinal direction thereof and having the welding tip inside the through hole; And a supply cylinder which is mounted in a state where the operating rod is inserted into the through hole at the rear of the supply housing and discharges the welding tip provided inside the through hole to the outside of the supply housing.

The operating cylinder may be a pneumatic cylinder whose working pressure is pneumatic or a hydraulic cylinder whose working pressure is hydraulic pressure.

The supply housing is disposed on the upper portion of the welding tip mounting unit and can be selectively moved toward the upper portion of the welding tip mounting unit depending on whether the operating cylinder is operated or not.

Wherein the welding tip feeding unit comprises: a loading housing having one end thereof opened and connected to the through-hole of the supply housing, and in which a plurality of the welding tips are loaded; And a plurality of welding tips mounted on the other end of the loading housing so that the operating rod is positioned inside the loading housing, and a plurality of the welding tips loaded in the loading housing are inserted one by one into the welding tip feeding unit And a feeding cylinder.

The loading housing may have a cover on the top surface to selectively open the inside.

The lid may be rotatably connected to an upper surface of the loading housing.

The feeding cylinder may comprise a pneumatic cylinder whose working pressure is pneumatic or a hydraulic cylinder whose working pressure is hydraulic pressure.

Wherein the welding tip mounting unit comprises: a lifting plate disposed in front of the mounting plate; A lifting cylinder mounted on a front upper end portion of the base frame and connected to a lower portion of the lifting plate; A rotating cylinder including a rotating rod and mounted on an upper surface of the ascending / descending plate; A rotating plate mounted on a rotating rod of the rotating cylinder; And a welding tip fixing means mounted on one surface of the rotary plate and fixing the welding tip supplied from the welding tip supply unit.

The ascending / descending cylinder may be a pneumatic cylinder having an operating pressure of pneumatic pressure or a hydraulic cylinder having an operating pressure of hydraulic pressure.

Wherein the welding tip fixing means comprises: a stationary cylinder mounted on one surface of the rotary plate; At least two sliding rods installed on the upper portion of the fixed cylinder and slidable toward the center of the fixed cylinder depending on whether the fixed cylinder is operated or not; And a clamper mounted on the sliding rod and fixing the outer circumferential surface of the welding tip.

The sliding rod may be disposed at a position spaced apart from the center of the fixed cylinder by an angle of 90 degrees around the outer circumferential surface.

The fixed cylinder may include a four-axis finger cylinder slidingly moving each of the sliding rods toward the center or slidably moving toward the outer circumferential surface depending on whether the operating pressure is supplied.

The fixed cylinder may be a pneumatic cylinder whose working pressure is pneumatic or a hydraulic cylinder whose working pressure is hydraulic pressure.

The lifting and lowering plate can be guided up and down through guiding means mounted on both sides of the base frame when lifted or lowered by the operation of the lifting and lowering cylinder.

Wherein the guide means comprises: a mounting bracket mounted on the base frame; A guide block mounted on the mounting bracket; And a guide rod which is slidably mounted through the guide block and whose upper end is mounted on the lifting plate.

The guide rod is slidably inserted into a sliding hole formed in the guide block, and may be formed as a circular rod.

As described above, according to the welding tip exchanging apparatus for spot welding according to the embodiment of the present invention, the welding tips of the upper and lower welding guns are automatically replaced when the welding tips mounted on the upper and lower welding guns of the spot welding machine are worn , It is possible to shorten the time required for replacement and alignment of the welding tip, to improve the productivity by automating the replacement process, and to prevent occurrence of defective replacement of the welding tip.

In addition, there is also an effect of shortening the time for supplying a new welding tip by automatically supplying the welding tip to be replaced to each welding gun through the welding tip supplying unit.

In addition, by automating the welding tip replacement work, which has conventionally been performed manually, it is possible to prevent the operator from being exposed to the risk factors, thereby preventing the occurrence of safety accidents and securing the safety of the worker. It is possible to prevent a phenomenon that the position of the upper and lower welding guns of the upper and lower welding guns is changed.

In addition, since the welding tips mounted on the upper and lower welding guns can be replaced with one welding tip exchanging apparatus, there is also an effect of reducing manufacturing costs such as the labor cost of the worker according to the conventional manual work.

1 is a configuration diagram of a spot welding gun according to the prior art.
2 is a perspective view of a welding tip changing apparatus for spot welding according to an embodiment of the present invention.
3 is a perspective view of a welding tip removal unit applied to a welding tip replacement apparatus for spot welding according to an embodiment of the present invention.
4 is a perspective view of a welding tip feeding unit applied to a welding tip exchanging apparatus for spot welding according to an embodiment of the present invention.
5 is an operational state diagram of a welding tip feeding unit applied to a welding tip changing apparatus for spot welding according to an embodiment of the present invention.
6 is a perspective view of a welding tip mounting unit applied to a welding tip exchanging apparatus for spot welding according to an embodiment of the present invention.
7 is an operational state view of a welding tip mounting unit applied to a welding tip replacement apparatus for spot welding according to an embodiment of the present invention.
Figs. 8 to 11 are operational states of a welding tip replacement apparatus for spot welding according to an embodiment of the present invention. Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory only and are not restrictive of the invention, It should be understood that various equivalents and modifications may be present.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

And throughout the specification, when an element is referred to as " comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

It should be noted that terms such as " ... unit ", " unit of means ", " part of item ", " absence of member ", and the like denote a unit of a comprehensive constitution having at least one function or operation it means.

2 is a perspective view of a welding tip changing apparatus for spot welding according to an embodiment of the present invention.

Referring to the drawings, a welding tip replacing apparatus 100 for a spot welder according to an embodiment of the present invention includes a welding tip 107 mounted on upper and lower welding guns 103 and 105 of a spot welder 101, The welding tip 107 of the upper and lower welding guns 103 and 105 is automatically replaced with the welding tip 107 of the upper and lower welding guns 103 and 105 so as to shorten the time required for the welding tip replacement and alignment and to automate the replacement process.

1, a welding tip replacing apparatus 100 for spot welding according to an embodiment of the present invention includes a base frame 110, a mounting plate 115, a welding tip removing unit 120, A welding tip feeding unit 130, a welding tip feeding unit 140 and a welding tip mounting unit 150. [

First, the base frame 110 has upper and lower welding guns 103 and 105, and is installed in a workshop equipped with a spot welder 107 movably installed by the action of a robot (not shown).

The mounting plate 115 is formed in the shape of a rectangular plate and mounted on the top of the base frame.

In the present embodiment, the welding tip removing unit 120 is installed on one side of the upper portion of the mounting plate 115, and is mounted on the upper welding gun 103 or the lower welding gun 105, Clamped and worn out welded tip 107 is completed and will be described in detail below with reference to Fig. 3 attached hereto.

3 is a perspective view of a welding tip removal unit applied to a welding tip replacement apparatus for spot welding according to an embodiment of the present invention.

3, the welding tip detaching unit 120 includes a detaching plate 121, a fixing block 123, a clamping block 125, and a clamping cylinder 129.

First, one end of the removal plate 121 protrudes outward from the top of the mounting plate 115, and a removal hole 122 is formed at one end of the protrusion.

The fixing block 123 is fixedly mounted on the upper surface of one end of the detaching plate 121 corresponding to the detaching hole 122.

The fixing block 123 may be formed with a support groove 124 through which the welding tip 107 is inserted and supported on one side surface corresponding to the removal hole 122.

The support groove 124 is formed along the height direction of the fixing block 123 and has a triangular shape in cross section and a plurality of support protrusions 127 may be formed on the inner surface along the height direction.

In this embodiment, the clamping block 125 is provided movably on the detaching plate 121 with the detaching hole 122 interposed therebetween in correspondence with the fixing block 123.

In this clamping block 125, a clamping groove may be formed along a height direction on one surface corresponding to the support groove 124. The clamping groove 126 may have a triangular shape in cross section, A plurality of clamping projections 128 may be integrally formed.

The clamping block 129 is attached to the other end of the removal plate 121. The clamping block 125 is connected to the actuating rod so that the clamping block 125 As shown in FIG.

Here, the clamping cylinder 129 may be a pneumatic cylinder having an operating pressure of pneumatic pressure, but the present invention is not limited thereto, and hydraulic pressure capable of replacing the pneumatic pressure may be applied.

The welding tip removing unit 120 configured as described above is configured such that the clamping cylinder 129 is operated in the reverse direction to move the upper welding gun The clamping cylinder 129 is operated to move the clamping block 125 to the fixed block 123 side when the lower welding gun 103 or the lower welding gun 105 is inserted into the upper or lower portion of the removal hole 122. [

The other side of the welding tip 107 is clamped through the clamping groove 126 of the clamping block 125 while one side of the welding tip 107 is supported by the support groove 124 of the fixing block 123.

The support protrusions 127 and the clamping protrusions 128 more reliably clamp the welding tips 107 positioned between the support grooves 124 and the clamping grooves 126.

In this state, when the welding guns 103 and 105 move upward or downward due to the behavior of the robot, the welding tips 107 are removed from the welding guns 103 and 105. When the removal of the worn out welding tip 107 is completed, the clamping cylinder 129 performs a backward operation to release the clamping of the welding tip 107.

Then, the welding tip 107 is released from the clamping of the clamping block 125 to the floor of the workplace through the removal hole 122 by its own weight.

Here, the work place is provided with a welding tip collection box for collecting the worn out welding tip 107 discharged from the removal hole 122 at a position corresponding to the removal hole 122, 107 are prevented from being dispersed.

In the present embodiment, the welding tip supply unit 130 is installed on the upper portion of the mounting plate 115 at the rear of the welding tip removing unit 120, and the tips of the welding guns 103 and 105 Which will be described later in detail with reference to FIGS. 4 and 5 attached herewith.

FIG. 4 is a perspective view of a welding tip feeding unit applied to a welding tip exchanging apparatus for spot welding according to an embodiment of the present invention, and FIG. 5 is a perspective view of welding tips Fig.

4, the welding tip supply unit 130 includes an operation cylinder 131, a connection block 133, a supply housing 135, and a supply cylinder 137. As shown in FIG.

First, the operating cylinder 131 is mounted on the rear side of the mounting plate 115.

The operating cylinder 131 may be a pneumatic cylinder having an operating pressure of pneumatic pressure. However, the operating cylinder 131 is not limited to the pneumatic cylinder, and may be a hydraulic cylinder to which the hydraulic pressure can be applied.

The connection block 133 is mounted on the operation rod of the operation cylinder 131 and the supply housing 135 is mounted on the connection block 133.

A through hole 136 is formed in the supply housing 135 so that the welding tip 107 can move inside the supply housing 135 along the longitudinal direction and the welding tip 107 is provided inside the through hole 136. do.

The supply housing 135 is disposed at an upper portion of the welding tip mounting unit 150 and is selectively moved toward the upper portion of the welding tip mounting unit 150 depending on whether the operating cylinder 131 is operated .

The supply cylinder 137 is installed in a state where the operating rod is inserted into the through hole 136 at the rear of the supply housing 135 and the welding tip 107 provided inside the through- To the outside of the front of the supply housing 135.

Here, the supply cylinder 137 may be formed of a pneumatic cylinder whose working pressure is a pneumatic pressure, but the present invention is not limited thereto, and hydraulic pressure capable of replacing the pneumatic pressure may be applied.

In this embodiment, the welding tip feeding unit 140 is configured to feed a plurality of new welding tips 107 internally loaded into the supply housing 135 of the welding tip supply unit 130 one by one, 135, respectively.

In this embodiment, the welding tip feeding unit 140 is composed of a loading housing 141 and a feeding cylinder 143.

The loading housing 141 is installed at one end of the loading housing 135 so as to communicate with the through hole 136 at one side of the supplying housing 135 and is provided with an unused A plurality of welding tips 107 are mounted.

A lid 143 is formed on the upper surface of the loading housing 141 so as to selectively open the inside of the loading housing 141. One end of the lid 143 can be rotatably connected to the upper surface of the loading housing 141.

Accordingly, when the welding tip 107, which has been loaded in the loading housing 141, is exhausted, the worker grips the other end of the lid 143 to rotate the lid 143, Thereby opening the inside.

In this state, the worker loads the unused welding tip 107 into the loading housing 141, and then closes the lid 143 again when the loading is completed, thereby externally exposing the loaded welding tip 107 to the outside And the loading housing 141 from being detached.

The feeding cylinder 145 includes an operating rod and is mounted at the other end of the loading housing 141 so that the operating rod is positioned inside the loading housing 141, A plurality of the welding tips 107 are selectively inserted one by one into the through holes 136 of the supply housing 135.

The feeding cylinder 145 may be formed of a pneumatic cylinder having its working pressure as pneumatic pressure, but the present invention is not limited thereto, and hydraulic pressure capable of replacing the pneumatic pressure may be applied.

That is, the welding tip feeding unit 140 configured as described above inserts the unused welding tip 107 loaded in the loading housing 141 into the through hole 136 of the supply housing 135, Lt; RTI ID = 0.0 > 145 < / RTI >

5 (S1), when the welding tip 107 is not supplied to the welding tip mounting unit 150, the welding tip supplying unit 130 having the above- The unused welding tip 107 mounted on the loading housing 141 is fed into the through hole 136 for feeding.

The welding tip supplying unit 130 supplies the welding tips 107 to be welded to the welding guns 103 and 105 from the welding tip feeding unit 140 into the through holes 136, Thereby maintaining the state of being positioned behind the mounting unit 150.

In this state, when the welding tip is to be supplied to the welding tip mounting unit 150, as shown in (S2) of Fig. 5, the operating cylinder 130 is advanced to feed the supply housing 135 to the welding tip mounting unit 150).

The welding tip supply unit 130 discharges the new welding tip 107 provided in the through hole 136 through the operation of the supply cylinder 137 to the outside of the through hole 136, And the welding unit 107 is supplied with the welding tip 107 to be newly attached to each welding gun 103, 105 by the mounting unit 150.

The welding tip mounting unit 150 is installed in front of the base frame 110 corresponding to the welding tip supplying unit 130 and receives the welding tip 107 from the welding tip supplying unit 130 A new welding tip 107 in an unused state is mounted at the tip of the upper welding gun 103 or the lower welding gun 105. This will be described below in more detail with reference to FIGS. 6 and 7 attached hereto.

Fig. 6 is a perspective view of a welding tip mounting unit applied to a welding tip exchanging apparatus for spot welding according to an embodiment of the present invention, and Fig. 7 is a perspective view showing a welding tip And Fig.

6, in this embodiment, the welding tip mounting unit 150 includes a lifting plate 151, a lifting cylinder 153, a rotating cylinder 155, a rotating plate 157, (160).

The lifting plate 151 is disposed at a predetermined distance from the mounting plate 115 in front of the mounting plate 115.

In this embodiment, the lifting / lowering cylinder 153 is mounted on the front upper end of the base frame 110, and the operating rod is connected to the lower portion of the lifting plate 153.

The upward / downward cylinder 153 may be a pneumatic cylinder having a working pressure as a pneumatic pressure. However, the present invention is not limited thereto, and hydraulic pressure capable of replacing the pneumatic pressure may be applied.

The rotating cylinder 155 includes a rotating rod 156 positioned toward the front of the lifting plate 151. The rotating cylinder 155 is rotatably supported by the feed housing 135 of the welding tip feeding unit 130, As shown in Fig.

The rotating cylinder 155 may be a pneumatic cylinder having a working pressure of pneumatic pressure. However, the present invention is not limited thereto. The rotating cylinder 155 may be formed of a hydraulic cylinder to which the hydraulic pressure can be applied, And is configured to rotate the rotary rod 156 in the forward or reverse direction.

The rotating plate 157 is mounted on a rotating rod 156 of the rotating cylinder 155 and rotated together with the rotating rod 156 according to whether the rotating cylinder 155 is operated.

The welding tip fixing means 160 is mounted on one surface of the rotary plate 157 and fixes the welding tip 107 supplied from the welding tip supply unit 130.

In this embodiment, the welding tip fixing means 160 is composed of a fixed cylinder 161, a sliding rod 163, and a clamper 165.

First, the fixed cylinder 161 is mounted on one side of the rotation plate 157.

The sliding rod 163 may be installed on the upper portion of the fixed cylinder 161 along the circumference of the fixed cylinder 161 and may be fixed to the fixed cylinder 161. [ The fixed cylinder 161 can be slid toward the center of the fixed cylinder 161 depending on the operation.

Here, the sliding rod 163 may be disposed at a position spaced apart from the center of the fixed cylinder 161 by an angle of 90 degrees around the outer circumferential surface thereof.

In this sliding rod 163, the welding tip 107 supplied from the welding tip supply unit 130 is positioned at the center of the fixed cylinder 161, and the periphery of the welding tip 107 The clamper 165 to be fixed is mounted.

That is, the sliding rod 163 is disposed at a position spaced apart from the fixed cylinder 161 by 90 ° around the outer circumference of the fixed cylinder 161, and the clamper 165 is mounted.

The fixed cylinder 161 may include a four-axis finger cylinder for slidably moving each of the sliding rods 163 toward or away from the outer circumferential surface of the sliding rod 163 depending on whether the operating pressure is supplied thereto, However, the present invention is not limited thereto, and may be constituted by a hydraulic cylinder to which hydraulic pressure can be applied instead of the pneumatic cylinder.

Here, the finger cylinder is slid toward the center of the center of the sliding rod with respect to the center according to whether the operating pressure is supplied or is slid so as to be collected toward the center, and this corresponds to a well-known technology. A detailed description of the operation is omitted.

7, the welding tip 107 is supplied from the welding tip supply unit 130 to the welding tip fixing means 160, When the sliding rod 163 is positioned at the center of the cylinder 161, the fixed cylinder 161 is operated to slide the sliding rods 163 toward the center thereof, The outer peripheral surface of the welding tip 107 is stably clamped and fixed.

In this state, when the welding tip is mounted on the upper welding gun 103, the welding tip mounting unit 150 rotates the welding tip 107 clamped through the welding tip fixing means 160 upward The plate 157 is maintained in the initial state in which the welding tip fixing means 160 is mounted.

On the other hand, when the welding tip 107 is mounted on the lower welding gun 105 located at the lower portion of the welding tip mounting unit 150, as shown in FIG. 7 (S20), the operation of the rotating cylinder 155 The rotary plate 157 is rotated by 180 ° so that the welding tip 107 clamped by the welding tip fixing means 160 is kept rotated to face the floor of the workplace.

In this state, the welding tip mounting unit 150 clamps the welding tip 107 clamped and fixed through the welding tip fixing means 160 to the welding tip 107 The welding tip 107 is attached to the tip of each welding gun 103 and 105 by being raised or lowered toward the upper welding gun 103 or the lower welding gun 105 positioned at the upper portion or the lower portion of the welding gun 103 or 105. [

The lifting and lowering plate 151 is lifted and lowered by guiding means 170 mounted on both sides of the base frame 110 when the lifting and lowering cylinder 153 is lifted or lowered by the operation of the lifting and lowering cylinder 153, .

The guide unit 170 includes a mounting bracket 171 mounted on both sides of the base frame 110 with the lifting cylinder 153 therebetween and a guide block 171 mounted on the mounting bracket 171 And a guide rod 175 mounted on the guide block 173 so as to be slidable through the guide block 173 and having an upper end mounted on the lifting plate 151.

Here, the guide rod 175 is slidably inserted into a sliding hole 174 formed in the guide block 173, and may be formed as a circular rod.

Accordingly, when the lifting plate 151 is lifted or lowered from the front of the base frame 110 through the forward and backward reciprocating operation of the lifting cylinder 153, 175 can be moved up and down more stably by guiding the movement of the lifting plate 151 while sliding in the sliding hole 174 of the guide block 173.

Hereinafter, the operation and operation of the welding tip replacing apparatus for spot welding according to the embodiment of the present invention will be described in detail.

Figs. 8 to 11 are operational states of a welding tip replacement apparatus for spot welding according to an embodiment of the present invention. Fig.

First, when the abrasion of the welding tip 107 mounted on the upper welding gun 103 or the lower welding gun 105 is much progressed and replacement is required, the spot welder 101 is welded The welding tip removal unit 120 of the tip exchange apparatus 100 is moved.

In this state, when the welding tip 107 of the lower welding gun 105 is removed, the lower welding gun 105 is inserted into the removal hole 122 of the removal plate 121, .

At this time, the welding tip removing unit 120 keeps the clamping cylinder 129 in a state of being positioned to be apart from the fixing block 123 by the backward operation of the clamping cylinder 129.

Then, when the welding tip 107 of the lower welding gun 105 is inserted upwardly from the lower part of the removal hole 122 and is positioned between the fixing block 123 and the clamping block 125, the clamping cylinder 129 The clamping block 125 moves forward to the fixed block 123 side.

The other side of the welding tip 107 is clamped through the clamping groove 126 of the clamping block 125 while one side of the welding tip 107 is supported by the support groove 124 of the fixing block 123.

The support protrusions 127 formed on the support grooves 124 and the clamping grooves 126 and the respective clamping protrusions 128 are connected to the welding tips 107 located between the support grooves 124 and the clamping grooves 126 ) Is more reliably clamped.

In this state, when the lower welding gun 105 is moved downward by the behavior of the robot, the welding tip 107 is detached from the lower welding gun 105.

When the worn out welding tip 107 is completed, the clamping cylinder 129 performs a backward operation to release the clamping of the welding tip 107, And discharged to the welding tip collection box provided in the workplace.

Here, when the welding tip 107 mounted on the upper welding gun 103 is removed, the operation of the welding tip removing unit 120 is performed by the above-described process of removing the welding tip 107 from the lower welding gun 105 But the upper welding gun 103 is inserted from the upper portion of the removal hole 122 to the lower portion.

The unused new welding tip 107 to be replaced in the upper and lower welding guns 103 and 105 is fed from the welding tip feeding unit 140 to the welding tip feeding unit 130 as described above Is moved to the upper portion of the fixed cylinder 161 of the welding tip fixing means 160 by the operation of the operating cylinder 131 while being provided in the through hole 136 of the supply housing 135. [

The welding tip 107 to be replaced is discharged from the inside of the through hole 136 by the operation of the supply cylinder 137 and is inserted into the upper portion of the fixed cylinder 161, As the clamper 165 is clamped around the outer peripheral surface by the operation, it is fixed to the welding tip fixing means 160. [

In this state, the welding tip fixing means 160, as shown in Fig. 9, rotates the rotary cylinder 155 in response to the lower welding gun 105 in which the worn out welding tip 107 has been removed And is rotated together with the rotating plate 157 rotated by the rotating plate 157.

At this time, the lower welding gun 105 is positioned in a state of being spaced downward from the welding tip 107 to be replaced, which is clamped to the welding tip fixing means 160 by the behavior of the robot.

As shown in FIG. 10, when the lower welding gun 105 is properly positioned, the lifting and lowering cylinder 153 performs a backward operation to lower the lifting plate 151. At the same time, And the clamped welding tip is mounted on the tip of the lower welding gun 105 while the tip fixing means 160 is lowered.

When the replacement welding of the new welding tip 107 to the lower welding gun 105 is completed, the fixing cylinder 161 of the welding tip fixing means 160 is operated to move each clamper through the sliding rod 163, The clamping of the tip 107 is released. In this state, the ascending / descending cylinder 153 advances to return the ascending / descending plate 151 to the original position.

When the lifting plate 151 is returned to its original position, the welding tip fixing means 160 is rotated 180 degrees by the operation of the rotating cylinder 155 and the welding tip supplying unit 130 The welding tip 107 is supplied from the welding tip 107 and clamped again.

On the other hand, when the welding tip 107 is to be replaced with the upper welding gun 103, the upper portion of the welding tip 107 clamped to the welding tip fixing means 160 in the state of (S1) When the upper welding gun 103 is positioned at a position spaced apart from the upper welding gun 103 by a predetermined distance, as shown in FIG. 11, the ascending / descending cylinder advances to raise the ascending / descending plate 131.

Then, the welding tip 107 clamped to the welding tip fixing means 160 is raised toward the tip of the upper welding gun 103 and mounted on the tip of the upper welding gun 105.

When the replacement of the welding tip 107 to the upper welding gun 103 is completed, the lifting cylinder 153 is operated after the welding tip 107 is unclamped through the operation of the welding tip fixing means 160 The welding tip mounting unit 150 is returned to the initial position.

That is, in the welding tip changing apparatus 100 according to the embodiment of the present invention, when the welding tip 107 mounted on the upper and lower welding guns 103 and 105 of the spot welding machine 101 is worn and is required to be replaced, The process as described above is repeated to remove the worn out welding tip 107 and automatically replace the new unused welding tip 107. [

Therefore, when the welding-tip replacing apparatus 100 for spot welding according to the embodiment of the present invention as described above is applied, the welding tips 103 and 105 mounted on the upper and lower welding guns 103 and 105 of the spot- The welding tip 107 of the upper and lower welding guns 103 and 105 is automatically replaced at the time of abrasion of the welding tip 107 to shorten the time required for welding tip replacement and alignment and to automate the replacement process, And it is possible to prevent occurrence of defective replacement of the welding tip.

It is also possible to shorten the time for supplying the new welding tip 107 by automatically supplying the welding tips 107 to be replaced to the welding guns 103 and 105 through the welding tip supplying unit 130. [

In addition, by automating the welding tip replacing work, which has conventionally been performed manually, it is possible to prevent the worker from being exposed to the risk factors, thereby preventing the occurrence of safety accidents and securing the stability of the worker. Or the position of the upper and lower welding guns 103 and 105 of the spot welder 101 is prevented from being changed, thereby improving the welding quality.

In addition, since the welding tip 107 mounted on the upper and lower welding guns 103 and 105 can be replaced by one welding tip changing apparatus 100, it is possible to replace the manufacturing cost of the worker ' Can be saved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

100: welding tip changing device 101: spot welding machine
103: upper welding gun 105: lower welding gun
107: welding tip 110: base frame
115: mounting plate 120: welding tip detaching unit
121: Removing plate 122: Removing hole
123: fixed block 124: support groove
125: Clamping block 126: Clamping groove
127: support protrusion 128: clamping protrusion
129: Clamping cylinder 130: Welding tip feed unit
131: actuating cylinder 133: connecting block
135: supply housing 136: through hole
137: Feed cylinder 140: Welding tip feeding unit
141: stacking housing 143: cover
145: feeding cylinder 150: welding tip mounting unit
151: ascending / descending plate 153: ascending / descending cylinder
155: rotating cylinder 156: rotating rod
157: rotating plate 160: welding tip fixing means
161: fixed cylinder 163: sliding rod
165: clamper 170: guide means
171: mounting bracket 173: guide block
174: Sliding hole

Claims (23)

A base frame installed in a worksite provided with a spot welder having upper and lower welding guns;
A mounting plate mounted on an upper end of the base frame;
A welding tip removing unit installed on one side of the upper portion of the mounting plate for removing the worn welding tip mounted on the upper welding gun or the lower welding gun;
A welding tip supply unit installed at an upper portion of the mounting plate at the rear of the welding tip removing unit, for supplying a new welding tip to be mounted to the tip of each welding gun;
A welding tip feeding unit mounted on one side of the welding tip feeding unit, in which a plurality of new welding tips to be replaced with the upper and lower welding guns are loaded and the welding tips are inserted into the welding tip feeding units one by one; And
A welding tip mounting unit installed in front of the base frame in correspondence with the welding tip supplying unit and receiving the welding tip from the welding tip supplying unit and mounting the welding tip on the tip of the upper welding gun or the lower welding gun; ≪ / RTI >
The welding tip removing unit
A detaching plate having one end projecting outwardly from an upper portion of the mounting plate and having a detachment hole formed at a protruding end thereof;
A fixing block fixedly mounted on an upper surface of one end of the removal plate corresponding to the removal hole;
A clamping block movably provided on the detachable plate with the detachment hole therebetween in correspondence with the fixed block; And
A clamping cylinder mounted on the other end of the removal plate and connected to the clamping block;
And a welding tip for welding the welding tip for spot welding. delete The method according to claim 1,
The fixed block
And a support groove is formed on one side of the removal hole to support the welding tip. The method of claim 3,
The support groove
Wherein a plurality of support protrusions are formed along a height direction of the fixing block, the support protrusions being formed in a triangular shape in cross section and along a height direction on an inner surface thereof. The method of claim 3,
The clamping block
And a clamping groove is formed along a height direction on one surface of the support groove corresponding to the support groove. 6. The method of claim 5,
The clamping groove
Wherein a shape of a cross section is formed in a triangular shape and a plurality of clamping projections are integrally formed on the inner surface along a height direction. The method according to claim 1,
The clamping cylinder
Wherein the working electrode is made of a pneumatic cylinder whose working pressure is pneumatic or a hydraulic cylinder whose working pressure is hydraulic. The method according to claim 1,
The welding tip supply unit
An actuating cylinder mounted to the rear of the mounting plate;
A connecting block in which a rear surface is mounted to an operating rod of the operating cylinder;
A supply housing mounted on the connection block and having a through hole formed along a longitudinal direction thereof and having the welding tip inside the through hole; And
A supply cylinder mounted in the through hole at the rear of the supply housing in a state where the operation rod is inserted into the through hole and discharging the welding tip provided inside the through hole to the outside of the supply housing;
And a welding tip for welding the welding tip for spot welding. 9. The method of claim 8,
The operating cylinder
Wherein the working electrode is made of a pneumatic cylinder whose working pressure is pneumatic or a hydraulic cylinder whose working pressure is hydraulic. 9. The method of claim 8,
The supply housing
Wherein the welding tip is disposed on an upper portion of the welding tip mounting unit and is selectively moved toward the upper portion of the welding tip mounting unit depending on whether the operating cylinder is operated. 9. The method of claim 8,
The welding tip feeding unit
A loading housing in which one end is opened and connected to the through hole of the supply housing, and a plurality of the welding tips are loaded in the loading housing; And
And a plurality of welding tips mounted on the other end of the loading housing such that the operating rod is positioned inside the loading housing, and a plurality of the welding tips loaded in the loading housing are inserted one by one into the welding tip feeding unit Feeding cylinder;
And a welding tip for welding the welding tip for spot welding. 12. The method of claim 11,
The loading housing
And a cover is formed on the upper surface so as to selectively open the inside of the welding tip. 13. The method of claim 12,
The cover
And one end is rotatably connected to an upper surface of the loading housing. 12. The method of claim 11,
The feeding cylinder
Wherein the working electrode is made of a pneumatic cylinder whose working pressure is pneumatic or a hydraulic cylinder whose working pressure is hydraulic. The method according to claim 1,
The welding tip mounting unit
A lifting plate disposed in front of the mounting plate;
A lifting cylinder mounted on a front upper end portion of the base frame and connected to a lower portion of the lifting plate;
A rotating cylinder including a rotating rod and mounted on an upper surface of the ascending / descending plate;
A rotating plate mounted on a rotating rod of the rotating cylinder;
Welding tip fixing means mounted on one surface of the rotary plate and fixing the welding tip supplied from the welding tip supply unit;
And a welding tip for welding the welding tip for spot welding. 16. The method of claim 15,
The up / down cylinder
Wherein the pneumatic cylinder is a pneumatic cylinder whose working pressure is pneumatic or a hydraulic cylinder whose operating pressure is hydraulic. 16. The method of claim 15,
The welding tip fixing means
A fixed cylinder mounted on one surface of the rotating plate;
At least two sliding rods installed on the upper portion of the fixed cylinder and slidable toward the center of the fixed cylinder depending on whether the fixed cylinder is operated or not; And
A clamper mounted on the sliding rod for fixing an outer circumferential surface of the welding tip;
And a welding tip for welding the welding tip for spot welding. 18. The method of claim 17,
The sliding rod
Wherein the welding head is disposed at a position spaced apart from the center of the stationary cylinder by an angle of 90 degrees around the circumference of the circumference. 18. The method of claim 17,
The fixed cylinder
And a four-axis finger cylinder for slidably moving each of the sliding rods toward the center or slidably moving toward the outer peripheral surface in accordance with whether or not the operating pressure is supplied. 18. The method of claim 17,
The fixed cylinder
Wherein the working electrode is made of a pneumatic cylinder whose working pressure is pneumatic or a hydraulic cylinder whose working pressure is hydraulic. 16. The method of claim 15,
The rising and falling plate
Wherein when the up / down cylinder is raised or lowered by the operation of the up / down cylinder, the up / down movement is guided through guiding means mounted on both sides of the base frame. 22. The method of claim 21,
The guide means
A mounting bracket mounted on the base frame;
A guide block mounted on the mounting bracket; And
A guide rod which is slidably mounted through the guide block and whose upper end is mounted on the lifting plate;
And a welding tip for welding the welding tip for spot welding. 23. The method of claim 22,
The guide rod
Wherein the guide block is slidably inserted into a sliding hole formed in the guide block and is formed of a circular rod.

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