JP5216556B2 - DIP surface treatment apparatus and dip surface treatment method - Google Patents

Description

  The present invention relates to a dip-type surface treatment apparatus and a dip-type surface treatment method used when surface treatment is performed on a vehicle body of a vehicle such as an automobile.

  In vehicles such as automobiles, the vehicle body is subjected to surface treatment. In the dip type surface treatment apparatus used for performing the surface treatment, the surface of the vehicle body is subjected to rust prevention treatment by immersing the vehicle body after the welding process in a treatment tank in which the electrodeposition liquid is accommodated. Since the electrodeposition liquid in the treatment tank is gradually soiled by foreign matter such as iron powder adhering to the vehicle body when immersed, the foreign matter is usually removed and kept clean while constantly circulating the electrodeposition liquid. .

For example, an overflow tank is provided at the end of the processing tank, and a partition wall between the processing tank and the overflow tank is formed in an inclined state toward a hopper that is a suction port of the processing tank, and the flow formed in the processing tank is The flow is divided into a hopper and an overflow tank. Therefore, bubbles on the surface of the liquid generated by the reaction of the processing liquid flow along the surface together with the foreign substances brought along with the object to be processed, reach the overflow tank over the partition wall weir, and flow downward through the inclined portion of the partition wall. The central flow reaches the hopper together with the bottom flow without generating turbulent flow and is discharged out of the system (see Patent Document 1).
Japanese Patent No. 3299922

However, in the above prior art, since the partition wall is inclined toward the suction port of the processing tank, a part of the surface flow sinks downward to become a reverse flow, and in front of the reverse flow, that is, the overflow tank. In the vicinity of the processing tank, a so-called “tide” bubble band is formed, and there is a problem that foreign matters attached to the object to be processed are accumulated in the bubble band and gradually grow and reattach to the object to be processed.
In addition, there is a problem that the above-described reversal flow collides with the bottom flow flowing in the vicinity of the bottom of the processing tank to generate turbulent flow, and this turbulent flow inhibits the smooth flow of the processing liquid to inhibit foreign matter discharge.

  Accordingly, the present invention provides a dip type surface treatment apparatus and a dip type surface treatment method that can suppress the generation of turbulent flow as much as possible, flow the treatment liquid smoothly and eliminate the retention of foreign matters, and discharge it outside the system. With the goal.

In order to achieve the above object, the invention described in claim 1 is a treatment tank (for example, electrodeposition tank 1 in the embodiment) that is attached to the object to be processed (for example, the vehicle body W in the embodiment) and is long in the horizontal direction. A dip type surface treatment apparatus that sucks and discharges foreign matter brought into the outside of the treatment tank, with one end surface in the length direction of the treatment tank extending over the entire surface and the length direction of the treatment layer as an axis. Are formed as a plurality of hoppers (for example, the first hopper 10 and the second hopper 20 in the embodiment) whose cross-sectional area gradually decreases toward the end surfaces, and the end surfaces of the hoppers (for example, the end surfaces 11 and 21 in the embodiments). ) Is provided with suction ports (for example, suction ports 14 and 28 in the embodiment).
According to a second aspect of the present invention, there is provided at least a plurality of hoppers formed so that the cross-sectional area gradually decreases toward the end surface with the length direction of the treatment layer as an axis over the entire end surface. The one end face is arranged so as to be divided into an upper part and a lower part.
The invention described in claim 3 is formed such that the bottom surface of the processing tank (for example, the bottom surface 4 in the embodiment) is inclined downward from one end to the other end in the length direction of the processing tank. It is characterized by that.
According to a fourth aspect of the present invention, the bottom surface is formed in two steps so as to incline downward from one end to the other end in the length direction , and one end side (for example, the second bottom surface 6 in the embodiment) is the other end. It is formed so that the inclination angle is larger than the side (for example, the first bottom surface 5 in the embodiment).
According to the fifth aspect of the present invention, the end surface of the hopper formed on the lower side of the one end surface (for example, the end surface 21 in the embodiment) is the bottom surface of the other end of the processing tank (for example, the first bottom surface in the embodiment). 5) It is characterized by being formed below.
The method invention described in claim 6 is a dip type surface treatment method for sucking and discharging foreign matter adhering to an object to be treated and brought into a treatment tank that is long in the horizontal direction, to the outside of the treatment tank. One end face in the length direction is formed as a plurality of hoppers whose cross-sectional area gradually decreases toward the end face with the length direction of the treatment layer as an axis over the entire surface, and is opened on the end face of each hopper. The foreign matter is discharged out of the processing tank through the suction port.

  According to the first and sixth aspects of the present invention, the surface of the object to be processed is effectively collected and removed by the hopper regardless of which part of the processing tank the foreign matter flowing in the processing tank flows. Since the treatment can be performed, there is an effect that the problem that the foreign matter adheres to the workpiece is less likely to occur.

  According to the second aspect of the present invention, foreign substances having different depth positions flowing depending on weight by the upper hopper and the lower hopper can be collected from the suction port and discharged out of the system.

  According to the invention described in claim 3, the relatively heavy foreign matter flowing near the bottom surface inclined from the other end to the one end is effectively flowed down to the hopper using the falling force of the foreign matter itself caused by the inclination angle. There is an effect that can be guided.

  According to the invention described in claim 4, since the flow in the lower layer of the treatment tank does not collide with the flow above it to form a turbulent flow, foreign matter having a high specific gravity such as iron powder is again treated with the treatment liquid. It can be surely prevented from scattering inside.

  According to the fifth aspect of the present invention, since the foreign matter flowing down the vicinity of the bottom surface can be gradually guided to the lower side and guided to the hopper, the foreign matter flowing down near the bottom surface is surely transferred to the lower hopper. There is an effect that can be guided.

Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a dip type surface treatment apparatus, and FIG. 2 is a cross-sectional explanatory view of the dip type surface treatment apparatus. 1 and 2, a dip type surface treatment apparatus mainly performs surface treatment for rust prevention in a pretreatment process of a painting process of an automobile production line.

  The electrodeposition tank 1 is formed of a steel plate material and stores an electrodeposition liquid, and a storage portion S supported by a plurality of legs K is disposed along a conveyance path 49 of the vehicle body W to be electrodeposited. Yes. 1 and 2, the left side is an entrance tank side 2 for carrying the vehicle body W, and the right side is an exit tank side 3 for carrying out the vehicle body W, and in the accommodating portion S of the electrodeposition tank 1, FIG. 1 and FIG. The electrodeposition liquid flows from the right side to the left side, that is, from the outlet side 3 toward the inlet side 2.

  Above the electrodeposition tank 1, a transport conveyor 51 for transporting the vehicle body W placed on the hanger 50 is provided. The transfer conveyor 51 is gradually immersed in the electrodeposition liquid 2 on the entrance tank side 2 of the electrodeposition tank 1 to be fully immersed, and on the exit tank 3 the vehicle body W is gradually lifted from the electrodeposition liquid from the fully immersed state. It is configured to be. Specifically, in the conveyor conveyor 51, the conveyance path 49 is installed obliquely downward so that the front portion of the vehicle body W is inclined obliquely downward on the tank side 2 so as to be immersed in the electrodeposition liquid. Thereafter, the vehicle body W is dipped and transported to the discharge tank side 3 in a horizontal state. In the discharge tank side 3, the front part of the vehicle body W is first exposed from the electrodeposition liquid with the rear part of the vehicle body W directed obliquely downward. A conveyance path 49 is installed obliquely upward so as to exit.

As shown in FIG. 2 to FIG. 7, a total of three first and second hoppers 10, 20, 20 facing the outside over the entire surface are placed on the tank side tank wall 2 a on the tank side 2 of the electrodeposition tank 1. The first hopper 10 is formed over the entire upper surface portion.
The first hopper 10 has a substantially quadrangular pyramid shape in which the cross-sectional area gradually decreases toward the end surface 11 of the first hopper 10 in a vertical and laterally symmetrical manner with respect to the length direction of the electrodeposition tank 1. (See also FIGS. 5 and 6). The end surface 11 of the first hopper 10 is connected to a circulation pipe 13 in which a suction pump 12 and a filter 30 are interposed. The connection port of the circulation pipe 13 constitutes the suction port 14 of the first hopper 10.

  In addition, a pair of second hoppers 20, 20 are opened symmetrically in the width direction about the length direction of the electrodeposition tank 1 in the substantially lower half of the tank-side tank wall 2 a of the electrodeposition tank 1. . The second hopper 20 has a substantially quadrangular pyramid shape in which the cross-sectional area gradually decreases toward the end face 21 (see also FIG. 7). The end surface 21 of the second hopper 20 is in a position deviated outwardly from its four equal position in the width direction of the electrodeposition tank 1 (see FIG. 3), and at least the electrodeposition in the height direction of the electrodeposition tank 1 The end surface 21 is configured to be positioned below a first bottom surface 5 described later, which is the bottom surface 4 on the outlet side 3 on the tank 1 side (see FIG. 2).

Here, as shown in FIG. 2, the bottom surface 4 of the electrodeposition tank 1 is connected to the first bottom surface 5 which is gradually inclined downward from the outlet tank side 3 to the inlet tank side 2, and is electrodeposited. The second bottom surface 6 is configured to be flush with the bottom surface 22 of the second hopper 20 of the tank 1, and the second bottom surface 6 is configured to be inclined further downward as compared with the first bottom surface 5. . Here, the bottom surface 4 on the exit tank side 3 is an exit tank side bottom surface 7 that rises obliquely upward from the first bottom surface 5.
The end surface 21 of the second hopper 20 is connected to a junction pipe 24a connecting the end faces 21. The junction pipe 24a is connected to a circulation pipe 24 in which a suction pump 23 and a filter 30 are provided. ing. Here, the connection port of the junction tube 24 a constitutes the suction port 28 of the second hopper 20. Reference numeral 29 denotes the upper surface of the second hopper 20.

  As shown in FIG. 4, the circulation pipe 13 and the circulation pipe 24 merge to form a circulation pipe 25 and are connected to a branch pipe 26 in the electrodeposition tank 1. The branch pipes 26 are pipes arranged in the width direction of the electrodeposition tank 1. A plurality of branch pipes 26 are arranged at equal intervals in the length direction of the electrodeposition tank 1, and are connected by a connecting pipe 19 provided on the left side of the electrodeposition tank 1. A circulation pipe 25 is connected to the connecting portion of the connecting pipe 19 and the branch pipe 26 on the outlet tank side 3 of the electrodeposition tank 1. Discharge nozzles 27 for electrodeposition liquid are arranged at equal intervals in the branch pipe 26, and the electrodeposition liquid is ejected obliquely downward from the discharge nozzle 27 toward the bottom surface 4. The electrodeposition liquid discharged from the discharge nozzle 27 and the electrodeposition liquid flow generated by the suction force of the suction pumps 12 and 23 rectify from top to bottom from the outlet tank side 3 to the inlet tank side 2 of the electrodeposition tank 1. The upper layer flow 31, the middle layer flow 32, and the lower layer flow 33 are formed. Here, the branch pipe 26 is disposed in the range from the bottom surface 7 of the electrodeposition tank 1 to the vicinity of the entrance of the second hopper 20 on the first bottom surface 5 and the second bottom surface 6. In addition, the discharge nozzle 27 on the outlet tank side bottom surface 7 discharges the electrodeposition liquid toward the inlet tank side 2, and some of the discharge nozzles 27 discharge the electrodeposition liquid also vertically below.

According to the above embodiment, the vehicle body W to be transported while being suspended on the transport conveyor 51 in the transport path 49 is immersed from the entrance tank side 2 of the electrodeposition tank 1 with the front portion of the vehicle body W directed obliquely downward. Surface rust prevention treatment is performed by electrodeposition.
Here, in the upper layer flow 31 in the electrodeposition tank 1, bubbles floating on the surface of the electrodeposition liquid due to the electrodeposition reaction, and fiber dust brought into the vehicle body W when the electrodeposition tank enters the electrodeposition tank are brought in. It flows down toward the first hopper 10.
Further, in the middle laminar flow 32 in the electrodeposition tank 1, foreign substances having a relatively small specific gravity such as fiber dust brought in contact with the vehicle body W when entering the electrodeposition tank 1 are attracted by the first hopper 10 and the second hopper 20. It flows down toward.

Therefore, the first hopper 10 reliably collects foreign matters having relatively small specific gravity such as bubbles and fiber dust floating on the surface of the electrodeposition liquid, and these foreign matters are collected from the suction port 14 of the circulation pipe 13 provided on the end surface 11. It is discharged out of the system by the suction pump 12 and removed by the filter 30.
At this time, since the first hopper 10 is configured to be vertically and horizontally symmetrical with respect to the longitudinal axis of the electrodeposition tank 1, a turbulent flow is generated even if the upper laminar flow 31 and the middle laminar flow 32 become a collective flow. There is no, and relatively light foreign matter does not go downstream.

On the other hand, as shown in FIG. 8, in the lower layer flow 33, the electrodeposition liquid ejected from the discharge nozzles 27 arranged at equal intervals of the branch pipes 26 laid at equal intervals in the length direction of the electrodeposition tank 1. Due to the flow, foreign matter having a relatively high specific gravity, such as iron powder and welding sealer brought in contact with the vehicle body W when entering the electrodeposition tank 1, flows down toward the second hopper 20.
Therefore, the second hopper 20 reliably collects foreign matter having a relatively large specific gravity, such as iron powder and welding sealer, and this foreign matter is sucked from the suction port 28 formed in the end face 21 through the junction pipe 24a and the circulation pipe 24. It is discharged out of the system by the pump 23 and removed by the filter 30.
As described above, the separate suction pumps 12 and 23 from the first hopper 10 and the second hopper 20 and 20 can remove foreign matters having different depth positions depending on the weight regardless of which part of the electrodeposition tank 1 flows. The surface treatment of the vehicle body W can be performed while collecting and removing, so that the generation of turbulent flow is suppressed, the electrodeposition liquid is smoothly flowed, foreign matter stays away, and the foreign matter adheres to the vehicle body W. Is less likely to occur.

At this time, as described above, the first bottom surface 5 in which the bottom surface 4 is gradually inclined downward in the range from the outlet tank side 3 to the inlet tank side 2 of the electrodeposition tank 1, is connected to the first bottom surface 5. Compared with the second bottom surface 6 which is configured to be inclined further downward and connected to the bottom surface 22 of the second hopper 20, the inclination angle of the first bottom surface 5 and the second bottom surface 6 is brought about. By using the falling force of the foreign matter itself, the foreign matter having a relatively large specific gravity can be effectively flowed down and guided to the second hopper 20.
In particular, by making the second bottom surface 6 steeply inclined from the first bottom surface 5, the lower layer flow 33 itself also flows down with a further inclination below the second bottom surface 6, so that the foreign matter is effective in the second hopper 20. Can be discharged.

  On the other hand, when a part of the lower layer flow 33 and the middle layer flow 32 flows down to the second hopper 20, the middle layer flow 32 is deflected downward on the upper surface 29 of the second hopper 20. Is inclined downward further along the bottom surface 22 of the second hopper 20 and collides with the deflected middle laminar flow 32, so that no turbulent flow is generated. It is possible to reliably prevent the particles from being scattered again in the electrodeposition liquid.

In particular, in this embodiment, since the transport direction of the vehicle body W is set in the direction opposite to the flow direction of the upper layer flow 31, the middle layer flow 32, and the lower layer flow 33, the flow rate of the electrodeposition liquid viewed from the vehicle body W is relatively As a result, the foreign matter is easily separated from the vehicle body W, and the cleaning effect of the vehicle body W can be enhanced.
Further, since the tank entry side 2 of the vehicle body W is the downstream side of the electrodeposition liquid for discharging the electrodeposition liquid out of the system, the most dirty body W to be subjected to surface treatment is immersed from the upstream side of the electrodeposition liquid. Compared to the case, the contamination of the electrodeposition liquid can be minimized.

  In addition, this invention is not limited to the said embodiment, For example, although the case where two 2nd hoppers 20 were provided was demonstrated, one 2nd hopper may be sufficient. And the tank side 2 of the vehicle body W can be set to the upstream side of the flow of electrodeposition liquid, and the tank side 3 of the vehicle body W can also be set to the downstream side of the flow of electrodeposition liquid. Moreover, although the case where one first hopper 10 and two second hoppers 20 are provided has been described, three or more hoppers may be provided. Further, electrodeposition may be performed by immersing the rear part of the vehicle body W downward from the entrance tank side 2 of the electrodeposition tank 1.

It is a side view of the dip type surface treatment apparatus of an embodiment of this invention. It is a longitudinal cross-sectional view of FIG. FIG. 3 is a view as seen from an arrow A in FIG. 2. It is a top view of FIG. It is sectional drawing which follows the BB line of FIG. It is sectional drawing which follows the CC line of FIG. It is sectional drawing which follows the DD line | wire of FIG. FIG. 3 is an enlarged view of a main part of FIG. 2.

Explanation of symbols

1 Electrodeposition tank (treatment tank)
4 bottom surface 5 first bottom surface 6 second bottom surface 11 end surface 10 first hopper 14 suction port 20 second hopper 21 end surface 28 suction port W vehicle body (object to be processed)

Claims (6)

A dip type surface treatment apparatus that sucks and discharges foreign matter adhering to an object to be treated and brought into a treatment tank that is long in the horizontal direction to the outside of the treatment tank, wherein one end surface in the length direction of the treatment tank is the entire surface thereof. A dip type characterized in that it is formed as a plurality of hoppers whose cross-sectional area gradually decreases toward the end surface with the length direction of the treatment layer as an axis, and a suction port is opened at the end surface of each hopper Surface treatment equipment. A plurality of hoppers formed so that the cross-sectional area gradually decreases toward the end surface with the length direction of the processing layer as an axis over the entire end surface is distributed at least to the upper and lower portions of the one end surface. The dip type surface treatment apparatus according to claim 1, wherein the dip type surface treatment apparatus is disposed. The dip type surface treatment according to claim 1 or 2, wherein a bottom surface of the treatment tank is formed so as to incline downward from one end to the other end in the length direction of the treatment tank. apparatus. The bottom surface is formed in two steps so as to incline downward from one end to the other end in the length direction, and the one end side is formed to have a larger inclination angle than the other end side. The dip type surface treatment apparatus according to any one of claims 1 to 3.   5. The dip type surface treatment apparatus according to claim 4, wherein an end surface of a hopper formed on a lower side of the one end surface is formed below a bottom surface of the other end of the treatment tank. A dip-type surface treatment method for sucking and discharging foreign matter adhering to an object to be treated and brought into a treatment tank that is long in the horizontal direction to the outside of the treatment tank, wherein one end surface in the length direction of the treatment tank is entirely covered Forming a plurality of hoppers whose cross-sectional area gradually decreases toward the end face with the length direction of the treatment layer as an axis, and the outside of the treatment tank from the suction port opened in the end face of each hopper A dip-type surface treatment method characterized by discharging foreign matter.

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