KR200344311Y1 - Panel and Nut Supporting Device for Nut Welding Apparatus for Preventing Eccentric - Google Patents

Abstract

The present invention relates to a panel and nut supporting device of a nut welder to prevent the fastening of the panel and the screw hole of the nut to be eccentrically welded to improve the reliability of the product. Including the first electrode and the second electrode facing the lower portion of the first electrode and pressing and welding the nut on the panel located between the first electrode and the second electrode to match the fastening hole of the panel and the screw hole of the nut In the nut welder, a fixing part having an accommodating groove is fixed to an upper end of the second electrode, and a panel support part is coupled to an upper part of the fixing part to cover the receiving groove. The lower part is accommodated in the receiving groove of the fixing part, the panel guide pin and the panel guide pin are exposed to the upper part through the panel support part, and the nut guide pin is exposed to the upper part through the panel guide pin. The threaded hole of the ball and the nut is fitted to be inclined to maintain a close state without mutual play. By supplying air at a predetermined pressure from the air pump into the receiving groove of the fixing portion, the panel guide pin and the nut guide pin are always constantly supported upward.

Description

Panel and Nut Supporting Device for Nut Welding Apparatus for Preventing Eccentric}

The present invention relates to a nut welder, and more particularly to a panel and nut support device of the nut welder to prevent the fastening of the panel and the screw hole of the nut to be eccentrically welded.

In general, various parts that are bolted to each other are installed in automobiles, airplanes, ships, etc., in order to improve the assemblability of the bolt coupling method, the nut is fixed on the metal panel in advance, Nut welders have been developed that allow only bolts to be assembled.

The nut welding machine mainly uses a spot welding method. A spot welding method is a type of electric resistance welding in which two welding objects are placed on both sides of an electrode and the current and pressure are applied locally. .

As shown in FIG. 1, a conventional nut welder is installed at a main body 10, a nut feeder 12 installed at the main body 10 to supply a nut, and a predetermined height at an upper side of the main body 10. The movable electrode 22 and the fixed electrode for welding the nut supplied from the nut feeder 12 on the elevating device 20 which moves up and down, and the panel 16 interposed with and interposed with the elevating device 20. It consists of 24.

The panel 16 and the nut support device 30 for supporting the panel 16 and the nut welded on the panel 16 are coupled to the upper portion of the fixed electrode 24.

Figure 2 is a cross-sectional view showing a conventional panel and nut support device, Figure 3 is a cross-sectional view showing its operation.

As shown, the conventional panel and nut support device 30 includes a fixing part 32 fixed to the upper end of the fixed electrode 24 and a panel support part 34 screwed to the upper side of the fixing part 32. Is inserted into the panel support portion 34, the upper side portion of the cylindrical guide pin 40 is exposed to the upper side of the panel support portion 34 and provided in the interior of the fixing portion 32, the upper guide pin 40 It consists of a spring 36 for convenience.

The guide pin 40 extends stepped to a larger diameter from the lower end of the nut guide portion 42 and the nut guide portion 42 for determining the position of the nut 14, thereby positioning the panel 16. It includes a staff member panel guide portion 44 for determining the, and the engaging portion 46 is formed to be opened outward from the lower end of the panel guide portion 44.

The panel support part 34 includes a through hole 34a through which the panel guide part 44 of the guide pin 40 passes, and an inclined part 34b at a lower end of the through hole 34a. As the locking portion 46 of the guide pin 40 contacts and latches the inclined portion 34b of the panel support portion 34, the guide pin 40 may not be separated from the panel support portion 34.

In the conventional nut welding machine configured as described above, the panel 16 is positioned on the panel support part 34 by fitting the fastening holes 16a of the panel 16 to the panel guide part 44 of the guide pin 40. After that, the nut 14 is supplied from the nut feeder 12 to be fitted to the nut guide portion 42 of the guide pin 40. Thereafter, the movable electrode 22 is lowered to the upper portion of the guide pin 40 so that the lowering pressure is slightly larger than the rigidity of the spring 36 that elastically supports the guide pin 40 upward. In addition to (14), by electrically conducting the movable electrode 22 and the fixed electrode 24, the nut 14 is spot welded on the panel 16.

However, as shown in Figure 3, the guide pin 40 of the conventional panel and nut support device is made of a cylindrical shape, the nut guide portion 42 and the panel guide portion 44 are integrally formed Thus, when the movable electrode 22 is pressurized, the panel guide portion 44 descends below the panel 16.

In this case, since the nut guide portion 42 having a diameter smaller than that of the panel guide portion 44 is located in the fastening hole 16a of the panel 16, the panel 16 is equal to the clearance x corresponding thereto. Because of this movement, an eccentricity is generated between the screw hole 14a of the nut 14 and the fastening hole 16a of the panel 16.

In addition, as the lifting and lowering is repeated by the pressing force of the movable electrode 22 and the elastic force of the spring 36, friction occurs with the panel 16 and the nut 14, and the pressing force of the movable electrode 22 is added to the guide pin ( 40 is easily worn or deformed, so that play occurs between the guide pin 40 and the panel 16 and the nut 14, so that the fastening hole 16a of the panel 16 and the threaded hole 14a of the nut 14 are formed. ) Is more eccentric and there is a problem of welding in a shifted state.

Moreover, due to repetitive work, as the elastic force of the spring supporting the guide pin upwards gradually weakens, the eccentricity of the panel and the nut worsens, thereby increasing the defective rate of the product.

In addition, in view of such a problem, a cumbersome work requiring frequent replacement of the guide pin and the spring is required, resulting in a waste of manpower and time, resulting in a decrease in productivity, and a manufacturing cost for these parts.

The present invention is to solve the problems of the prior art, an object of the present invention is to prevent the panel fastening hole and the screw hole of the nut eccentrically welded panel and nut support of the nut welder to improve the reliability of the product To provide a device.

Another object of the present invention is to provide an economical nut welder panel and nut support device by improving the workability and manufacturing cost by eliminating frequent replacement of parts.

1 is a front view showing a conventional nut welder,

Figure 2 is a cross-sectional view showing a panel and nut support device of a conventional nut welder,

Figure 3 is a cross-sectional view of the use state of the conventional panel and nut support device,

4 is a perspective view showing a panel and a nut support device of the nut welder according to the present invention;

5 is an exploded perspective view showing a panel and a nut support device according to the present invention,

6 is a cross-sectional view showing a panel and a nut support device according to the present invention,

Figure 7 is a cross-sectional view of the use state of the panel and nut support device according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: main body 12: nut feeder

14: nut 14a: screwdriver

16: panel 16a: fastener

30: support device 32: fixing part

34: panel support part 34a: through hole

34b: slope 36: spring

40: guide pin 42: nut guide portion

44: panel guide portion 130: panel and nut support device

132: fixing part 132a: receiving groove

134: panel support 133: air passage

134a: through hole 136: air supply pipe

140: panel guide pin 142: inclined portion

144: straight portion 146: locking portion

150: nut guide pin 152: first straight portion

154: inclined portion 156: second straight portion

158: catching part

Panel and nut support device of the nut welder according to the present invention for achieving the above object comprises a first electrode and a second electrode which is located opposite the lower portion of the first electrode and is located between the first electrode and the second electrode In a nut welder for pressure welding a nut on a panel to match the fastening hole of the panel with the screw hole of the nut,

A fixing part fixed to the upper end of the second electrode and having an accommodating groove thereon, coupled to an upper part of the fixing part to cover the accommodating groove, a panel support for supporting the panel, and a lower portion of the accommodating groove in the accommodating groove; The upper part is exposed through the panel support part, and the lower part is accommodated in the accommodating groove of the panel guide member for determining the position of the panel. The upper part is coaxial with the panel guide member and the upper part is exposed through the panel guide member. The nut guide member for determining the position of the nut, and a predetermined pressure is supplied into the receiving groove of the fixing portion so that the upper portion of the panel guide member and the nut guide member can be exposed through the panel support and the panel guide member, respectively. It consists of a pressure applying means for.

The panel guide member is formed in a cylindrical shape, the diameter gradually increases from the top to the lower side, and the inclined portion to which the fastening holes of the panel are fitted and is in close contact, the straight portion extending vertically downward from the lower end of the inclined portion, and the straight portion passing through the panel support portion. It extends outwardly from the lower end and is located in the receiving groove of the fixing portion is composed of a locking portion for preventing the separation from the panel support.

The nut guide member is formed in a cylindrical shape, and extends downwardly from the top vertically, the first straight portion into which the threaded hole of the nut is fitted, and the diameter gradually increases from the bottom to the lower side of the first straight portion, and the lower edge of the threaded hole of the nut is The inclined portion in close contact, the second straight portion extending vertically downward from the lower end of the inclined portion, passing through the panel guide member, and extending outwardly from the lower end of the second straight portion and located in the receiving groove of the fixing portion, It is made of a locking portion for preventing the departure.

Preferably, the panel guide member and the nut guide member are formed of a ceramic material.

The pressure applying means includes an air pump and an air supply pipe, one end of which is connected to the air pump and the other end of which is connected to the fixed portion, to communicate with the receiving groove of the fixed portion.

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

4 to 6 are a perspective view, an exploded perspective view and a cross-sectional view showing a panel and a nut support device of the nut welder according to the present invention, respectively. The overall configuration of the nut welder to which the panel and nut support device according to the present invention is mounted is the same as in the related art, and thus a detailed description of the welder will be omitted.

As shown, the panel and the nut support device 130 of the nut welder according to the present invention is fixed to the upper end of the fixed electrode 24 (see FIG. 1) and the upper portion of the fixing portion 132 The panel support pin 134 to be coupled to the panel support pin 134 is inserted into the panel support 134, and an upper portion of the panel support pin 134 is exposed to the upper side of the panel support 134. It is inserted coaxially to the pin 140 and the upper portion is exposed to the upper side of the panel guide pin 140 is composed of a nut guide pin 150 for determining the position of the nut (14).

Panel guide pin 140 is formed in a substantially cylindrical shape, the inclined portion 142 and the straight line extending vertically downward from the lower end of the inclined portion 142 to form a predetermined angle from the top to the lower side and gradually increasing the diameter A portion 144 and a locking portion 146 that extends and extends to a larger diameter at the lower end of the straight portion 144. The fastening hole 16a of the panel 16 is fitted into the inclined portion 142 of the panel guide pin 140 to be in contact with the panel 16 so that the panel 16 is held in close contact with the panel guide pin 140 without any play.

In the center of the panel guide pin 140, a through passage 148 is formed in the longitudinal direction so that the nut guide pin 150 passes.

The nut guide pin 150 is formed in a substantially cylindrical shape, and has a first angle 152 extending downward from the top vertically, and forming a predetermined angle from the lower end of the first straight portion 152 toward the lower side. An inclined portion 154 gradually enlarged, a second straight portion 156 extending vertically downward from the lower end of the inclined portion 154, and extended and extended to a larger diameter at the lower end of the second straight portion 156. It includes a locking portion 158.

The diameter of the through passage 148 of the panel guide pin 140 is set so that the second straight portion 156 of the nut guide pin 150 is inserted into the first guide portion 152 of the nut guide pin 150. Only the inclined portion 154 is exposed to the upper side of the panel guide pin 140. Thereby, the screw hole 14a of the nut 14 is fitted in the 1st linear part 152, and the lower edge of the screw hole 14a is caught by the inclined part 154, and the nut 14 is a nut guide. The pin 150 may be supported in close contact with no play.

As such, the panel guide pin 140 and the nut guide pin 150 provided separately include the inclined portion 142 to which the fastening hole 16a of the panel 16 and the screw hole 14a of the nut 14 are fitted. 154, the fastening hole 16a and the nut of the panel 16 due to the characteristic that the diameter of the inclined portions 142 and 154 gradually wears down, even if the outer circumferential surfaces of the inclined portions 142 and 154 gradually wear out with the use for a long time. The screw hole 14a of the 14 is to be in close contact with the inclined portions 142 and 154 without play.

Preferably, the panel guide pin 140 and the nut guide pin 150 is made of a ceramic material that is not wear well.

The fixing part 132 is formed in a cylindrical shape having an upper end, and therein is provided a receiving groove 132a in which the locking parts 146 and 158 of the panel guide pin 140 and the nut guide pin 150 are accommodated. do.

The panel support part 134 is press-fitted or screwed into the opened upper part of the fixing part 132 to cover the receiving groove 132a of the fixing part 132, and the straight portion 144 of the panel guide pin 140 at the center thereof. The through hole 134a through which is passed is formed. The locking portion 146 of the panel guide pin 140 is caught on the bottom surface of the panel support portion 134 to prevent the separation, and only the inclined portion 142 of the panel guide pin 140 is exposed to the upper side of the panel support portion 134. do.

In addition, the fixing portion 132 is provided with an air passage 133 in communication with the receiving groove 132a, the air passage 133 is coupled to the air supply pipe 136 connected to the air pump (not shown). The air supplied from the air pump is supplied into the receiving groove 132a of the fixing part 132 through the air supply pipe 136 and the air passage 133, and the air pressure is supplied to the panel guide pin 140 and the nut guide pin 150. By acting on the engaging portions (146, 158) of the), the guide pins (140, 150) are pressed upward.

Hereinafter, the operation and effect of the nut welder having a panel and nut support device according to the present invention configured as described above will be described with reference to FIGS. 6 and 7.

First, as shown in FIG. 6, when the air pump is operated to supply air into the receiving groove 132a of the fixing part 132 through the air supply pipe 136, the air pressure is applied to the panel guide pin 140 and the nut. The inclined portion 142 of the panel guide pin 140 is exposed to the upper side of the panel support portion 134 by acting on the engaging portions 146 and 158 of the guide pin 150, and the first of the nut guide pin 150. The straight portion 152 and the inclined portion 154 are exposed to the upper side of the panel guide pin 140. In this case, the panel guide pin 140 and the nut guide pin 150 are prevented from being separated from the panel support part 134 by the engaging parts 146 and 158 formed at the lower end thereof.

The fastening hole 16a of the panel 16 is fitted to the inclined portion 142 of the panel guide pin 140 so that the panel 16 is in close contact with each other without any gap. 1, the nut 14 is supplied from the nut 14, and the threaded hole 14a of the nut 14 is fitted into the first straight portion 152 of the nut guide pin 150. In contact with the inclined portion 154 of the nut guide pin 150 to be in close contact with each other without play.

Subsequently, as shown in FIG. 7, the movable electrode 22 is lowered to the upper portion of the nut guide pin 150 and the nut 14 to have a larger size than the air pressure for pressing the nut guide pin 150 upward. To lower the nut guide pin 150 and the nut (14). As a result, the nut guide pin 150 and the nut 14 are lowered together, and after the nut 14 contacts the upper surface of the panel 16, the nut 14 receives a predetermined pressure toward the panel 16. It is in close contact with the panel 16.

That is, as shown in FIG. 3, the guide pin 40 has a nut guide portion 42 and a panel guide portion 44 formed as a single body so that the guide pin 40 descends to the panel. The guide portion 44 was also lowered at the same time, so that a play occurred in the panel A, resulting in an eccentricity.

However, in the present invention, as shown in Figure 7, the guide means is composed of a nut guide pin 150 and a panel guide pin 140, the nut guide pin 150 of the panel guide pin 140 When descending along the through-hole 148, the panel guide pin 140 supports the panel 16 as it is by air supplied from the lower side, so no play occurs in the panel 16. Eccentricity does not occur between the threaded hole 14a of 14 and the fastening hole 16a of the panel 16.

At this time, the receiving groove 132a of the fixing part 132 through a minute gap between the panel support part 134 and the panel guide pin 140 and a minute gap between the panel guide pin 140 and the nut guide pin 150. The air inside is strongly blown toward the panel 16 and the nut 14 to remove various foreign matters such as dust and the like attached thereto.

Thereafter, the electric conduction is conducted between the movable electrode 22 and the fixed electrode 24, whereby the nut 14 is spot welded on the panel 16.

After the welding is completed, when the movable electrode 22 is raised, the panel guide pin 140 and the nut guide pin 150 are raised by the air pressure in the fixing part 132, and the nut 14 is returned to its original position. The welded panel 16 may be removed from the panel guide pin 140.

The present invention is not limited to the above-described embodiment, and any person having ordinary skill in the art to which the present invention pertains may make various modifications without departing from the gist of the present invention claimed in the claims.

As described above in detail, in the panel and nut support device of the nut welder according to the present invention, the panel guide pin and the nut guide pin separately provided to support the panel and the nut, respectively, the fastening holes of the panel, Since the inclined portion is in close contact with each other without clearance, there is an effect of allowing the nut to be welded in a state where the fastening hole of the panel and the screw hole of the nut are exactly matched.

In addition, since only the nut guide pin is lowered together with the nut when the movable electrode is lowered, and the panel guide pin is configured to support the panel as it is, unlike the related art, there is no play in the panel. Since the eccentricity is eliminated, the eccentricity between the screw hole of the nut and the fastening hole of the panel can be prevented twice.

In addition, by forming the nut guide pin and the panel guide pin made of a ceramic material, there is an effect that the wear or deformation does not occur in the friction with the nut or the panel, as well as the strong pressing force of the movable electrode.

In addition, since the guide pin is always constantly supported upward by the pressure of the air supplied from the air pump, the operation reliability is improved, and the cumbersome work such as replacing the conventional spring is unnecessary, and the strong blowing force of the air There is an advantage that can easily remove various foreign matter attached to the panel and the nut.

Claims (5)

And a nut of the fastening hole of the panel and the nut of the nut including a first electrode and a second electrode disposed to face the lower part of the first electrode, and press-weld the nut on a panel positioned between the first electrode and the second electrode. An apparatus for supporting the panel and the nut in a nut welder for coinciding and welding yarns, A fixing part fixed to an upper end of the second electrode and having a receiving groove thereon; A panel support part coupled to an upper part of the fixing part to cover the receiving groove and support the panel; A lower portion of the lower portion is accommodated in the receiving groove of the fixing portion, and an upper portion of the upper portion is exposed through the panel support to determine the position of the panel; A nut guide member configured to receive a lower portion in the receiving groove of the fixing portion, form a coaxial axis with the panel guide member, and expose an upper portion through the panel guide member to determine a position of the nut; And It is made of a pressure applying means for supplying a predetermined pressure into the receiving groove of the fixing portion to maintain the upper part of the panel guide member and the nut guide member exposed through the panel support and the panel guide member, respectively. Panel and nut support of the nut welder. The method of claim 1, wherein the panel guide member is formed in a cylindrical shape, The diameter gradually increases from the upper side to the lower side, and the inclined portion to which the fastening hole of the panel is fitted and is in close contact with each other, a straight portion extending vertically downward from the lower end of the inclined portion, passing through the panel support portion, and spreading outward from the lower end of the straight portion to extend. And a catching part positioned in the receiving groove of the fixing part to prevent the panel from being separated from the panel supporting part. The method of claim 2, wherein the nut guide member is formed in a cylindrical shape, A first straight portion extending vertically downward from an upper end thereof, into which a screw hole of the nut is fitted, an inclined portion of which a diameter gradually increases from the lower end of the first straight portion toward the lower side, and the bottom edge of the screw hole of the nut is in close contact; A second straight portion extending downward from the lower end of the inclined portion and passing through the panel guide member, and extending outwardly from the lower end of the second straight portion and positioned in the receiving groove of the fixing portion to be separated from the panel guide member; Panel and nut support device of the nut welder, characterized in that it comprises a locking portion for preventing. The panel and nut support device of claim 1, wherein the panel guide member and the nut guide member are made of a ceramic material. The air supply pipe according to any one of claims 1 to 4, wherein the pressure applying means includes an air pump and one end of which is connected to the air pump and the other end of which is connected to the fixing part to communicate with the receiving groove of the fixing part. Panel and nut support device of the nut welder comprising a.