JP3309699B2 - Cleaning equipment for electrodeposition coating - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning apparatus for electrodeposition coating for cleaning unnecessary paint adhered to a workpiece after the electrodeposition coating.

[0002]

2. Description of the Related Art In electrodeposition coating, a workpiece is immersed in an electrodeposition tank, and a potential difference is generated between the workpiece and an electrode provided in the electrodeposition tank, whereby the paint is deposited on the workpiece. Painted. In such an electrodeposition coating, the work taken out of the electrodeposition tank contains a paint that is only physically adhered in addition to the deposited paint.

[0003] The paint merely adhering to such a work is unnecessary, and in the subsequent baking process, the remaining paint only adhering causes a poor appearance. In order to collect the adhesion paint itself,
The work taken out of the electrodeposition tank is cleaned by a cleaning device.

[0004]

However, the shape of the work, for example, the body or parts of an automobile, has a seam or a bag structure in a steel plate, and in the conventional cleaning process,
There is a problem in that the adhered paint cannot be removed, and the remaining paint drops on other parts of the work during transportation or baking, and solidifies to give a poor appearance.

Accordingly, an object of the present invention is to provide a cleaning apparatus for electrodeposition coating which can effectively remove unnecessary paint adhering to a workpiece after electrodeposition coating without remaining as much as possible. is there.

[0006]

[0007]

[0008]

SUMMARY OF THE INVENTION The present invention of claim 1, wherein in order to achieve the above object, after electrodeposition coating, provided along the conveying path of the workpiece taken out of the electrodeposition bath, of the workpiece A moving means for moving along with the conveying movement, a plurality of spray nozzles attached to the moving means for spraying the cleaning water onto the work, a work conveying speed detecting means for detecting a conveying speed of the work, and a type of the work Work determination means for determining the work position, the work position detection means for detecting the position of the work in the transfer path, based on the work transfer speed detected by the work transfer speed detection means,
A movement control unit that controls the movement of the movement unit so that the movement unit moves in synchronization with the movement of the work; and a movement control unit that is suitable for the work determined by the work determination unit from the plurality of spray nozzles. A nozzle selecting means for selecting a spray nozzle and a signal from the work position detecting means determine that the work has come to a cleaning start position, and blowing of cleaning water from the spray nozzle selected by the nozzle selecting means. Cleaning means for controlling electrodeposition coating.

[0009]

[0010]

According to the first aspect of the present invention, after the electrodeposition coating, the transfer speed of the work taken out of the electrodeposition bath, the type of the work, and the work position are respectively determined by the work transfer speed detecting means, the work determining means, The movement of the moving means is controlled by the movement controlling means based on the signals from these means detected by the work position detecting means, the spray nozzle is selected by the nozzle selecting means, and the washing water is blown out by the cleaning controlling means. , Cleaning water can be sprayed intensively following the work to a place where the adhered paint tends to remain depending on the shape of the work, so that effective cleaning can be performed. there is an effect that the excellent economic efficiency requires to use the amount of water is also less.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described.

FIG. 1 is a drawing for explaining the entire cleaning line, FIG. 2 is an enlarged view of a # 5 water washing portion described later, and FIG. 3 shows a schematic configuration of a work following type cleaning device 1 described later. For this reason, this is a drawing including a state where this is viewed from the downstream side in the work transfer direction. In each figure, a dotted line represents a signal path.

As shown in FIG. 1, the cleaning line roughly separates the coated work 2 transported and taken out from the electrodeposition tank 3 for performing the electrodeposition coating by an ultrafiltration (UF) device 40. The UF recovery water washing process (UF water washing) 4 for washing with the used water and the water washing process (industrial / upper water washing) 5 using industrial water or tap water, and the work 2 which has completed the industrial / upper water washing 5 is a baking furnace. 70. The work 2 is transported along the transport line 12 while being held by the carrier 14.

The UF washing step 4 includes a plurality of fixed sprays 4.
# 1 cleaning water is sprayed onto the work 2 for cleaning
Washing, washing the work 2 by immersing the work 2 in a dip tank 42 filled with washing water # 2 washing, and washing by spraying washing water on the work 2 with a plurality of fixed sprays 43 #
It consists of 3 washings. The washing water used here is permeated water from which most of the paint components in the coating liquid have been removed by the ultrafiltration device 40 using the coating liquid in the electrodeposition tank 3 as a supply source (the pigment in the paint is removed by approximately 100%. About 90% or more of the resin component is removed), and the washing water after washing is # 1
In # 3 water washing, the washing water in the dip tank 42 always overflows through the recovery tank 60 and is returned to the electrodeposition tank 3 respectively.

In the work / water washing step 5, the work 2 is immersed in a dip tank 54 filled with the wash water to wash the work 2 and a plurality of fixed sprays 55 are used to spray the wash water onto the work 2 to perform the washing. It comprises a # 5 rinsing to be performed, and a work-following-type cleaning apparatus 1 described below to which the present invention is applied. The washing water used here is industrial water or tap water (or deionized water or detergent-containing washing water may be used), and the water after washing used in the engineering / washing water washing step 5 is It is collected by the collection tank 71, and part or all of it is purified and reused.

In the present embodiment, the work-following type cleaning apparatus 1 is provided after the fixed spray 55 of the # 5 water washing in the work / water washing step 5, and as shown in FIG. 2 and FIG. (The arrow A in FIG. 2).
Direction) Two spray nozzles 11 are provided in a moving device 10 as moving means. The moving device 10 moves on the guide rail 22 when, for example, the rotation of the motor 21 is transmitted by a belt or a wire (not shown) or the like,
The electric system including the motor 21 is housed in a drip-proof case (not shown). The motor 10 is connected to an inverter 91 controlled by a control device 9 described below,
The rotation speed changes, and the moving speed of the moving device 10 is appropriately adjusted. In addition, the moving device 10 may be configured to run on a guide rail by a roller or the like connected to a motor, and the drip-proof case is not limited to the electric system. The entire moving device may be stored.

# 5 At the entrance of the washing, a work transfer speed detecting means 6 for detecting a work transfer speed, a work determining means 7 for determining the type of work, and a work position detecting means for detecting that a work has arrived. 8 are provided.

A control device 9 functioning as a movement control means, a nozzle selection means and a cleaning control means adjusts the moving speed of the moving device 10 and cleans the movement based on signals from the detection means 6, 7, and 8. The selection of the spray nozzle 11 that blows out the water and the timing at which the cleaning water is blown out are adjusted so that the cleaning water is intensively sprayed on a specific portion of the work 2 following the movement of the work 2.

Here, the work speed detecting means 6 includes:
For example, the speed at which the work is actually being conveyed is detected using a non-contact speedometer such as an optical sensor or an ultrasonic sensor, and the speed information is sent to the control device 9.
Work 2 or carrier 1 on which work 2 is placed
The information processing device, which is attached to the communication device 4 and wirelessly exchanges information, transmits to the control device 9 what kind of work (for example, vehicle type, specification, shape, etc.) has come to this process. Feed and work position detecting means 8
As a result, the passage of the work is detected by a limit switch or an optical sensor, and the information is sent to the control device 9. In order to carry out the present invention, these detecting means may be of any type as long as the transport speed of the work, the work position and the type of the work are known. Things don't have to be, for example,
The information may be obtained from a host computer that manages the entire cleaning line, and control may be performed. Further, the host computer may also serve as the control device.

The washing water in the work-following washing apparatus 1 is supplied from a washing water tank 15 storing industrial water or tap water by a pump 16 to an electromagnetic three-way valve 17.
Is supplied to the electromagnetic three-way valve 18 immediately before the spray nozzle 11, and the electromagnetic three-way valve 18 is switched according to an instruction from the control device 9, and cleaning water is blown out from one of the two spray nozzles 11.

Each of the spray nozzles 11 is connected to a piping path 26 branched from the electromagnetic three-way valve 18 by a flexible pipe 20 whose blowing angle can be freely adjusted. The spray pattern of the spray nozzle 11 is shaped such that a beam of water 25 can be discharged so that local cleaning can be performed. The angle of each spray nozzle 11 is adjusted to the shape of the type of the work 2 passing through the washing line, and the angle of the spray nozzle 11 is set such that the beam-shaped water discharge 25 hits the portion where the paint is most difficult to be washed. Depending on the type of the workpiece to be cleaned, more spray nozzles may be provided and switched by a multi-way valve that switches a plurality of spray nozzles instead of a three-way valve, or a plurality of spray nozzles directed in different directions. May be blown out at once.

As described above, the use of the work-following cleaning device 1 concentrates on a specific place on the work, for example, a place where the adhered paint tends to remain, such as a joint or a bag structure on the work. And since cleaning water can be sprayed following the movement of the work,
In the case of conventional dip washing or fixed type spray washing alone, the number is significantly reduced.

Here, an example of the amount of water used when the cleaning water is sprayed on a specific portion on the work will be described. First, in the case of a work-following cleaning device to which the present invention is applied, here, a work-following cleaning device is provided on both sides of a work, and cleaning water is simultaneously blown out from four spray nozzles on one side, so that a specific 4 In the case where the parts are intensively cleaned, the cleaning conditions are as follows: spray time is 30 seconds, tact time is 1 minute / unit, flow rate of one spray is 7 liters / minute (pressure 15 kg / cm ² ), Assuming a distance of 2 m, the amount of water used per work is 7 × 4 × 2 = 56.
Liters / minute.

On the other hand, when the same fixed amount of washing water is sprayed on a specific portion by the conventional fixed spray washing, the washing conditions are as follows: the number of fixed sprays is 20 per side, and the flow rate of one spray is 5 times. 0.7 liter / min (pressure 10kg
/ Cm ² ), assuming that the spray pattern is diffuse radiation, the amount of water used per work is 5.7 × 20 × 2 = 22.
8 liters / minute.

As can be seen from the calculation results, the conventional fixed spray cleaning requires a very large amount of cleaning water, which is not economical, and even if such a large amount of water is used, the shape of the work cannot be reduced. Depending on the case, there is a possibility that the adhered paint remains. On the other hand, according to the work-following type cleaning device to which the present invention is applied, the cleaning water can be sprayed intensively on the portion where the adhered paint is likely to remain and following the work. It is economical and effective, and effective cleaning is possible. Further, in the present embodiment, the embodiment using industrial water or tap water as the washing water has been described. However, when the permeated water by the ultrafiltration device is used as the washing water, the work following type washing to which the present invention is applied is used. The conventional method requires an ultrafiltration apparatus having a filtration capacity about four times that of the conventional apparatus. In this respect, the present invention is more economically advantageous.

In the above-described embodiment, the work-following type cleaning device 1 is disposed after the # 5 rinsing. However, as shown in FIG. 4, for example, as shown in FIG. Alternatively, the work 2 may be arranged so as to be inclined while being conveyed while the work 2 is lifted from the dip tank 42 or 54. As a result, it is not necessary to extend the cleaning line itself as compared with the case where the cleaning line is arranged after the above-mentioned # 5 rinsing, and it is possible to save the space in constructing the cleaning line,
The present invention can be implemented more economically.

[Brief description of the drawings]

FIG. 1 is a drawing for explaining an entire cleaning line in which a work following type cleaning apparatus to which the present invention is applied is used.

FIG. 2 is a drawing for explaining a work following type cleaning apparatus to which the present invention is applied.

FIG. 3 is a drawing for explaining a work following type cleaning apparatus to which the present invention is applied.

FIG. 4 is a drawing for explaining another installation mode of the work following type cleaning apparatus to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Work-following washing | cleaning apparatus, 2 ... Work, 3 ... Electrodeposition tank, 4 ... UF recovery rinsing process, 5 ... Industrial water or tap water rinsing process, 6 ... Work transfer speed detecting means, 7 ... Work position detecting means, 8 ... work discriminating means, 9 ... control device, 10 ... moving device, 11 ... spray nozzle, 15 ... wash water tank, 16 ... pump, 17, 18 ... electromagnetic three-way valve, 20 ... flexible pipe.

Claims (1)

(57) [Claims] 1. After the electrodeposition coating, the wafer removed from the electrodeposition tank is
Is provided along the transport path of the workpiece and transports the workpiece.
Moving means that moves with the moving means; and
A plurality of spray nozzles to be attached, and a work transfer speed detecting means for detecting a transfer speed of the work.
A step, a work determining means for determining the type of the work, and a work position for detecting a position of the work in the transport path.
Position detecting means, and the transfer of the work detected by the work transfer speed detecting means.
Based on the feed speed, the movement is synchronized with the movement of the work.
Moving means for controlling the movement of the moving means so that the means moves;
Motion control means, and the work discriminating means from among the plurality of spray nozzles.
Select a spray nozzle suitable for the work identified by the step
A nozzle selecting means for selecting the workpiece and a signal from the workpiece position detecting means,
Is determined to be at the cleaning start position, and the nozzle selection
Blowing of washing water from the spray nozzle selected by the means
Cleaning control means for controlling
Cleaning equipment for electrodeposition coating.