KR101816489B1 - Plating apparatus for detecting a wheel nut lost - Google Patents

Abstract

The present invention relates to a plating apparatus for detecting a loss of a wheel nut. The plating apparatus for detecting a loss of a wheel nut comprises: a hanger to hold a plurality of racks to transport the racks; racks having a plurality of nut hangers to fix a wheel nut to be plated, and a rack hanger on an upper end thereof to be held on the hanger; a hanger transport device to move the hanger from any one plating bath among multiple plating baths arranged on a plating apparatus to a different plating bath in accordance with a plating order; a hanger seating part arranged on each plating bath to support the hanger when the racks held on the hanger are immersed in a plating solution; a weight sensor arranged on the hanger transport device to measure the weight including the hanger, the plurality of racks held on the hanger, and a plurality of wheel nuts fixed on the plurality of racks; and a control unit to compare the hanger weight before plating with the hanger weight after plating to detect a loss of a wheel nut.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a plating apparatus,

More particularly, the present invention relates to a plating apparatus which detects a wheel nut that is dropped from a rack and prevents the plating liquid from being influenced by a drop-off wheel.

Generally, electroplating has a barrel type and a rack type. The barrel type is generally referred to as a "barrel", and a large amount of the object to be plated is put into a cylinder having a plurality of holes for energization and passing, so that the barrel is immersed in a plating bath and the barrel is slowly rotated, Plating is suitable for plating.

Such a barrel method is advantageous in that the processing cost is low due to the mass processing method of the object to be plated, but the current density of the plating liquid is low and the plating quality is inferior because the object to be plated and the object to be plated are in contact with each other in the barrel.

This type of barrel can be used for plating general products but it is not possible to use chrome plating after Nickel plating like car wheel nuts. That is, since the current efficiency of the chromium plating is very low, the current density can not be used for a barrel type having a low density.

The rack method is to plated the object to be plated by hanging it on a plating rack, often called a "rack". Such a rack method is advantageous in that the plating quality is excellent because a predetermined interval is maintained between the objects to be plated because the object to be plated is placed on the rack and the rack is placed on the plating vessel and the plating operation is performed.

The rack is formed with a hook at the upper end of the vertical bar so that it can hang on the plating vessel, and on both sides of the vertical bar, a plurality of nut hangers are formed so as to insert the wheel nut.

In general, automotive wheel nuts are made of copper-nickel-chrome multilayer plating for corrosion prevention and decoration. These wheel nuts are closely related to the stability of automobiles and are exposed to the outside. Do. Therefore, it is recognized that in the plating industry, the barrel method in which the plating quality is relatively poor can not be coated with the wheel nut. Therefore, all of the steps of plating the wheel nut are performed by the rack method, in which the pretreatment for pretreatment of the wheel nut, that is, the pretreatment, the nickel plating, the water rinsing, the chromium plating and the post treatment are performed.

On the other hand, racks are processed in such a manner that a plurality of racks are fixed to the hanger bars for the sake of process efficiency, and racks are inserted / removed into the plating baths in such a manner that the lifting and lowering devices raise and lower the hanger bars.

At this time, the wheel nut mounted on the rack may fall off due to shaking due to the hanger bar lifting and the like, which may affect the plating liquid. If the eliminated wheelet is not immediately removed, the plated film is dissolved in the plating solution in the previous step, thereby changing the composition of the plating solution, leading to deterioration of the plating quality of the wheelet.

Patent Document 1: Korean Patent No. 10-0924569 'Rack for Car Wheelet Plating' (Publication Date October 30, 2009) Patent Document 2: Korean Patent Registration No. 10-0918975 'Car Wheelet Plating Method and Electroless Nickel Plating Device' (September 25, 2009)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a plating apparatus for detecting a missing wheel nut in a rack to prevent a dropped wheel nut from affecting a plating solution.

According to one aspect of the present invention, there is provided a device for plating a wafer, comprising: a hanger for transferring a plurality of racks; A rack having a plurality of nut holders for fixing a wheel nut to be plated and a rack hanger at an upper end to be mounted on the hanger; A hanger conveyor for moving the hanger from one plating bath among the plurality of plating baths provided in the plating apparatus to the other plating bath in accordance with a plating procedure; A hanger compartment disposed in each of the plating tanks and supporting the hanger when a rack mounted on the hanger is immersed in the plating liquid; A load sensing sensor disposed on the hanger conveyor for measuring weight including the hanger, a plurality of racks fixed to the hanger, and a plurality of wheel nets fixed to the plurality of racks; And a controller for comparing the weight of the hanger before plating and the weight of the hanger after plating to detect that the wheel nut has been dropped.

At this time, the controller compares the first weight, which is the weight of the hanger before plating, with the second weight, which is the weight of the hanger that has been raised after plating, to detect that the wheel nut has been dropped.

On the other hand, the eliminator for detecting disappearance of a wheelet may further include a digital hydrometer which is disposed in each plating bath and measures the specific gravity of the plating solution contained in the plating bath.

At this time, the control unit can detect that the wheel nut detachment has occurred by comparing the third weight, which is the weight of the hanger in a plating bath, with the fourth weight, which is the weight of the hanger in the next plating bath.

In addition, the controller may compare the third weight and the fourth weight based on the specific gravity value of each plating liquid measured in the digital density meter provided in each plating tank, and then detect that the wheel nut dropout has occurred.

According to the plating apparatus for detecting dropout of the wheel nut according to the embodiment of the present invention,

First, the first weight, which is the weight of the hanger before plating, is compared with the second weight, which is the weight of the hanger that has been raised after the plating, to detect that the wheel nut has been dropped. Thus, among the various plating vessels provided in the plating apparatus, Can be distinguished. Therefore, it is possible to easily recover the dropped wheel nuts and to prevent deterioration of the plating quality.

Second, the eliminator for detecting disappearance of the wheelet includes a digital atomic scale disposed in each plating tank and measuring the specific gravity of the plating liquid contained in the plating tank, and the control unit controls the concentration of the plating liquid based on the specific gravity value of each plating liquid measured in the digital specific gravity meter provided in the plating tank So that the error caused by the difference in specific gravity of the plating liquid can be corrected.

1 is a perspective view of a device for detecting a fallen-off balloon according to the present invention.
Fig. 2 is a perspective view showing the rack disclosed in Fig. 1. Fig.
3 is a perspective view illustrating a hanger according to an embodiment of the present invention.
4 is a cross-sectional view of a hanger according to an embodiment in which a rack bar and a tightening bar are combined.
5 illustrates an example in which the weight of the hanger is measured through the load sensor.
6 is a view for explaining that a hanger and a hanger according to another embodiment of the present invention are transported by the overfeed conveying unit.
7 is a cross-sectional view of the hanger according to another embodiment, in which the rack hanger is engaged.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that, in the drawings, the same components are denoted by the same reference symbols as possible. Further, the detailed description of known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some of the components in the drawings are exaggerated, omitted, or schematically illustrated.

1 is a perspective view of a device for detecting a fallen-off balloon according to the present invention. Fig. 2 is a perspective view showing the rack disclosed in Fig. 1. Fig. 3 is a perspective view illustrating a hanger according to an embodiment of the present invention. 4 is a cross-sectional view of a hanger according to an embodiment in which a rack bar and a tightening bar are combined. 5 illustrates an example in which the weight of the hanger is measured through the load sensor.

1 to 5, the device for detecting a fallen-off balloon dropout according to the present invention includes a hanger 100, a rack 200, a hanger feeder 300, a hanger stand 400, a load sensor 500, a control unit 600, and a digital specific gravity meter 700.

The hanger 100 is transported through a plurality of racks 200.

The rack 200 is provided with a plurality of nut holders 220 for fixing the wheel nets N to be plated and a rack hanger 210 at the upper end to be mounted on the hanger 100. Referring to FIG. 2, the nut hangers 220 are disposed on both sides of the rack body 230. Since the rack 200 uses the rack disclosed in Patent Document 1 (Korean Registered Patent No. 10-0924569 'Automotive Wheelnut Plating Rack', published on October 30, 2009), a detailed description thereof will be omitted.

The hanger feeder 300 moves the hanger 100 from one plating bath among the various plating baths P1, P2, P3... Provided in the plating apparatus to another plating bath in accordance with the plating order. The hanger conveyor 300 includes a top conveyance unit 320 for receiving both ends of the hanger 100, an elevator mechanism for moving up and down the hanger 100, and a conveyance rail 310 for moving the elevator mechanism to another plating vessel do. For the sake of simplicity, the concrete city of the elevator is omitted.

The plating process of the wheel nut (N) proceeds in the order of a copper plating process, a nickel plating process and a chromium plating process, and includes a cleaning process between each plating process. Therefore, in the actual plating apparatus, the cleaning tank is disposed between the plating tanks. However, in the present invention, the cleaning tanks and the plating tanks are collectively referred to as 'plating tanks' for the sake of brevity.

The hanger stand 400 is disposed in each of the plating tanks P1, P2, P3 ..., and when the rack 200 held on the hanger 100 is immersed in the plating liquid W, .

As described with reference to FIGS. 1 and 5, the hanger rest bands 400 are provided on the upper side of the plating vessel in a pair in the width direction.

The hanger stand 400 includes a first conductive plate 410 for applying a current to the hanger 100. The first conductive plate 410 serves to support the hanger 100 and also serves as an electrode for applying a current to the hanger 100. Thus, the hanger conveyor 300 can lower the hanger 100 on the hanger stand 400 and perform work on the hanger placed in another plating vessel.

The load sensing sensor 500 is disposed on the hanger conveyor 300 and includes a hanger 100, a plurality of racks 210-1, 210-2, ... and a plurality of racks 210-1 , 210-2, ...) is measured. A plurality of racks 210-1, 210-2, ... are mounted on the hanger 100 and a plurality of wheelnotes N are provided in each of the plurality of racks 210-1, 210-2, The expression for measuring the weight of the hanger 100 in the present invention is a weight of the hanger 100, the plurality of racks 210-1, 210-2, And does not measure the weight of the hanger 100 alone.

The control unit 600 compares the weight of the hanger before plating and the weight of the hanger after plating to detect that the elimination of the wheel nut has occurred.

That is, when the plating is performed, it is normal that the weight of the hanger is increased by the weight of the coating plated on the wheel nut (N). Therefore, when the weight of the hanger measured after plating is lighter than the weight before plating, the wheel nut (N) .

The control unit 600 compares the first weight, which is the weight of the hanger before plating, with the second weight, which is the weight of the hanger that has been raised after plating, and when the second weight is measured to be less than the first weight, Can be detected.

When the control unit 600 detects that the elimination of the wheel nuts has occurred, the control unit 600 displays an alarm or the like on a control panel (not shown) or the like so that the process manager can retrieve the eliminated wheel nets from the plating vessel.

The digital hydrometer 700 is disposed in each of the plating tanks P1, P2, P3, and measures the specific gravity of the plating liquid contained in the plating tank.

The process of measuring the weight of the hanger 100 in a state where the hanger 100 is lifted by the hanger conveyor 300 includes the steps of raising the rack 200 due to the raising operation, need.

In addition, since the filled plating liquid flows out of the wheel nut (N), it is necessary to wait for the weight measurement until the plating liquid sufficiently escapes for accurate weight measurement. As described above, the method of measuring the weight in the state where the hanger 100 is lifted can slow the progress of the process to the next plating bath.

In order to shorten the waiting time, weight measurement is performed in a state where the hanger 100 is put in the plating tank, and it is possible to detect whether the wheel nut is dropped or not. When the hanger 100 is put into the plating vessel, the swing of the rack 200 is quickly stabilized by the plating liquid W. Further, since the plating liquid W is charged into the flour mill N while the hanger 100 is charged into the plating tank, the waiting time for measuring the weight of the hanger 100 is not long.

The controller 600 may compare the third weight, which is the weight of the hanger in a plating bath, with the fourth weight, which is the weight of the hanger in the next plating bath.

At this time, an error may occur in the weight value measured according to the specific gravity of the plating liquid contained in each plating vessel. (As described above, different kinds of plating tanks are arranged according to the plating process sequence.)

Therefore, the controller 600 corrects the third weight and the fourth weight based on the specific gravity value of each plating liquid measured in the digital hydrometer 700 provided in each of the plating vessels P1, P2, P3, It is possible to detect that the wheel nut dropout has occurred.

In other words, the corrected third weight is compared with the compensated fourth weight, and it is possible to detect that the wheel nut dropout occurs when the fourth weight is measured to be less than the third weight.

On the other hand, the plating liquid flows through the gap between the rack hanger 210 and the hanger bar 110, thereby deteriorating electrical connectivity.

3 is a perspective view illustrating a hanger according to an embodiment of the present invention. The hanger 100 according to the embodiment will be described with reference to FIG.

The hanger 100 includes a hanger bar 110, a second conductive plate 120, a hanger hanger 130, and a contact member 140.

The hanger bar 110 is formed to have a length corresponding to the width of the plating bath for mounting the plurality of racks 200. The hanger bar 110 is preferably formed of a metal having a high conductivity for energizing, for example, high purity copper, and is preferably in the form of a rod having a rectangular cross section to increase the contact area with the rack hanger 210.

The second conductive plate 120 is provided at both ends of the hanger bar 110 and contacts the first conductive plate 410 of the hanger station 400 to apply a current to the hanger 100. The second conductive plate 120 is also preferably formed of a high-purity copper member having high conductivity for energization.

The hanger hanger 130 extends upward from the second conductive plate 120 and has a structure in which the hanger hanger 130 is mounted on the overhanging portion 320 of the hanger conveyor 300. The hanger hook 130 has a Λ shape so as to correspond to the shape of the overfeed conveying part 320. The hanger hook 130 has a Λ shape so as to prevent the hanger 100 from moving when the hanger 100 moves up and down, So as to be overlapped with the conveying unit 320.

The contact member 140 pushes and fixes the outer surface of the rack hanger 210 so that the inner surface of the rack hanger 210 is brought into close contact with the hanger bar 110. [

To this end, the contact member 140 includes a contact bar 142 and a contact bar gauge 141.

The tightening bar 142 closely contacts the outer surface of the rack hanger 210 so that the inner surface of the rack hanger 210 closely contacts the hanger bar 110.

Shaped hooking structure 142 in which the tightening bar 142 is fitted so that the tightening bar 142 applies the tightening pressure to the outer surface of the racking hinge 210, .

4 is a cross-sectional view of the hanger according to the embodiment in which the rack hanger and the tightening bar are combined. Fig. 4 (a) is a side view of the hanger bar A gap is formed between the hanger bar 110 and the inner surface of the rack hanger 210 by the tightening bar 142. [

The hanger bar 110 and the rack hanger 210 are located close to the plating liquid in order to immerse the wheel nut N in the plating liquid. However, due to the swinging of the plating liquid upon the introduction of the rack 200 or air injection for smooth circulation of the plating liquid The plating liquid may flow into the gap between the inner side of the rack hanger 210 and the hanger bar 110. [ The rack hanger 210 and the hanger bar 110 must be in electrical contact with each other. However, due to contamination of the plating liquid, an unnecessary chemical reaction occurs at the contact portion and electrical contact deterioration occurs. (N).

According to the tightening bar 142, since the inner surface of the rack hanger 210 and the hanger bar 110 are in close contact with each other even if the plating liquid splashes, the plating liquid can not flow into the hanger bar 110,

6 is a perspective view illustrating a hanger according to another embodiment of the present invention. Specifically, the hanger 100 'and the hanger 100' according to another embodiment are conveyed by the overfeed conveying unit 320 ' do. 7 is a sectional view of the hanger 100 'according to another embodiment, in which the rack hanger 210' is coupled.

A hanger 100 'according to another embodiment will be described with reference to FIGS. 6 and 7. FIG.

The hanger 100 'includes a first hanger bar 110a, a second hanger bar 110b, and a hinge member 150. [

The first hanger bar 110a and the second hanger bar 110b are formed to have a length corresponding to the width of the plating tank P. [ The first hanger bar 110a and the second hanger bar 110b are preferably formed of a metal having a high conductivity for energizing, for example, high purity copper, and may be formed of a rectangular cross-section to increase contact with the rack hanger 210 ' It is preferable to have a rod shape.

The hinge member 150 connects the upper ends of the first and second hanger bars 110a and 110b such that the first and second hanger bars 110a and 110b have a trapezoidal cross section. At this time, the hinge member 150 is preferably an M-shaped unfolding hinge.

Since the hanger 100 'according to another embodiment of the present invention has a trapezoidal cross section, the rack hanger 210' should be formed in a shape corresponding to a trapezoidal cross section as shown in FIG.

The hanger 100 'according to another embodiment of the present invention does not require a separate supporting structure for supporting the hanger stand 400. A first conductive plate 410 'having inclined surfaces 410a and 410b corresponding to a trapezoidal cross section is fitted to the inner surfaces of the first and second hanger bars 110a and 110b.

That is, the first conductive plate 410 'allows the M-shaped unfolding hinge 150 to be unfolded when the hanger 100' is laid so that the inner side of the rack hanger 210 ' 2 hanger bar 110b. Therefore, even if the plating liquid splashes, the inner side surface of the rack hanger 210 'is closely contacted with the first hanger bar 110a and the second hanger bar 110b, so that the inflow of the plating liquid does not occur, have.

The first hanger bar 110a and the second hanger bar 110b may be made to exceed the width of the plating bath P so as to have a protrusion A protruding outside the first conductive plate 410 '

At this time, the hanger feeder 300 includes a top conveying unit 320 'having the same shape as the inclined surfaces 410a and 410b of the first conductive plate 410'. Therefore, even when the hanger 100 'is being transported, the inner surface of the rack hanger 210' and the inner surface of the hanger 100 ' The close contact between the first hanger bar 110a and the second hanger bar 110b is maintained.

5, the hanger rest bench 400 is mounted on the upper side of the plating vessel in the width direction to support the hanger 100 when the rack 200 held on the hanger 100 is immersed in the plating liquid W The first conductive plate 410 may be contaminated by the plating liquid in the vicinity of the plating liquid W. Therefore, an unnecessary chemical reaction may occur between the first conductive plate 410 and the second conductive plate 120, resulting in deterioration of electrical contactability. This may result in deterioration of the plating quality of the wheel nut (N) Respectively.

In order to prevent this, it is preferable that the first conductive plate 410 is provided so as to be immersed in the conductive solution. The first conductive plate 410 is immersed in the conductive solution so that the first conductive plate 410 can be prevented from being contaminated even if the plating liquid splashes toward the first conductive plate 410 due to dilution with the conductive solution.

At this time, the conductive solution is accommodated in the container 420 opened at the upper side so that the hanger 100 contacts the first conductive plate 410, and is arranged to be circulated so that the solution contained in the container can be replaced according to a predetermined period . That is, the cleaning of the first conductive plate 410 can be maintained by the periodic replacement of the conductive solution, and the problem of degradation of the electrical connection with the second conductive plate 120 can be prevented in advance.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

1000: Detachable platter device
100: Hanger
200: Rack
300: Hanger conveyor
400: Hanger stand
500: Load sensor
600:
700: Digital Weighing Scale

Claims (5)

A hanger for transferring a plurality of racks;
A rack having a plurality of nut holders for fixing a wheel nut to be plated and a rack hanger at an upper end to be mounted on the hanger;
A hanger conveyor for moving the hanger from one plating bath among the plurality of plating baths provided in the plating apparatus to the other plating bath in accordance with a plating procedure;
A hanger compartment disposed in each of the plating tanks and supporting the hanger when a rack mounted on the hanger is immersed in the plating liquid;
A load sensing sensor disposed on the hanger conveyor for measuring weight including the hanger, a plurality of racks fixed to the hanger, and a plurality of wheel nets fixed to the plurality of racks;
A control unit for comparing the weight of the hanger before plating and the weight of the hanger after plating to detect that the wheel nut has been dropped; And
And a digital hydrometer which is disposed in each of the plating vessels and measures the specific gravity of the plating liquid contained in the plating vessel,
Wherein,
Wherein a third weight of the hanger in a plating bath is compared with a fourth weight of the hanger in a state of being held in the next plating bath to detect that the deterioration of the wheel nut has occurred. delete delete delete The method according to claim 1,
Wherein,
Wherein the first and second weights are corrected based on a specific gravity value of each plating liquid measured in a digital density meter provided in each plating vessel, .

Images