JPH0754288Y2 - Dip type surface treatment equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a pretreatment tank such as a degreasing tank, a chemical conversion tank, or a bath for performing pretreatment for coating or plating, or an electrodeposition tank for performing electrodeposition coating. The present invention relates to a dip type surface treatment device in which an object to be treated is immersed in a washing tank or the like.

[Conventional technology]

Surface treatment tanks such as pretreatment tanks, electrodeposition tanks, and water washing tanks are equipped with multiple riser pipes along the bottom of the tank. The chemical liquid or the cleaning liquid to be sprayed is vigorously sprayed on the surface of the object to be processed immersed in the bath, so that the pretreatment effect and the cleaning effect are enhanced. Further, in the electrodeposition tank, the coating liquid stored in the bath is agitated by the coating liquid that is cyclically jetted from the riser pipe to uniformly disperse the coating components and at the same time prevent the pigment from settling. The quality of the electrodeposition coating film is improved (Japanese Patent Laid-Open Nos. 62-192598, 62-199799 and Shokai Kaisho).
63-135656).

[Problems to be solved by the device]

By the way, in these surface treatment tanks, dust and dust mixed in the tank may be sludge, which may be deposited and accumulated on the bottom of the tank, and the sludge may cause clogging of the injection nozzle of the riser pipe.

Also, if a large amount of sludge accumulates on the bottom of the electrodeposition tank, it may be rolled up by the jet flow of the riser pipe and adhere to the surface of the object to be coated, causing serious coating film defects such as spots. , It is necessary to remove sludge settling at the bottom of the tank as soon as possible.

Therefore, in the past, the treatment liquid was completely extracted from the surface treatment tank every holiday when the operation of the device was stopped,
There was a trouble that the inside of the tank had to be cleaned, and the burden of labor and cost was great.

Therefore, the present invention reduces the frequency of cleaning the surface treatment tank, and even if the frequency of cleaning is reduced, clogging of the riser pipe,
In order to prevent coating film defects, etc., in order to achieve that purpose, the sludge that settles on the bottom of the surface treatment tank is collected in one place during operation of the equipment, and this is left as it is. The technical issue is to be able to discharge it outside the tank.

[Means for Solving the Problems]

In order to solve this problem, in the surface treatment apparatus according to the present invention, a riser pipe extending in the width direction along the bottom of the surface treatment tank for immersing the object to be treated is predetermined in the length direction of the surface treatment tank. Along with being arranged at intervals, a nozzle for injecting the surface treatment liquid toward the bottom of the surface treatment tank is attached to each of the riser pipes while being inclined in the direction of the pit recessed in the bottom of the tank. In the pit, the sludge accumulated inside is taken out together with the surface treatment liquid in the surface treatment tank by a pump and collected by a filter, and the surface treatment liquid from which the sludge has been removed is jetted from the nozzles of the riser pipes. A circulation pipe is connected to the surface treatment tank and returned to the surface treatment tank, and the circulation pipe is connected to each of the riser pipes through a plurality of branch pipes each provided with an automatic valve. Same direction There is a control panel that controls the opening and closing of the automatic valve of the branch pipe connected to each riser pipe that is lined up in succession with a certain time delay from the automatic valve of the branch pipe connected to the riser pipe far from the pit. It is characterized by being provided.

[Action]

According to the present invention, the nozzles of the riser pipes arranged at predetermined intervals in the length direction of the surface treatment tank are inclined toward the pit recessed in the bottom of the surface treatment tank, and further, The automatic valves provided on each branch pipe that circulates the surface treatment liquid to each of these riser pipes are controlled to open and close sequentially with a certain time delay from the automatic valve of the branch pipe connected to the riser pipe far from the pit. Therefore, the sludge settled on the bottom of the surface treatment tank is conveyed in the direction of the pit by the jet stream of the surface treatment liquid which is sequentially started to be jetted from the nozzle of the riser pipe far from the pit, and is accumulated therein.

The sludge accumulated in the pit is extracted together with the surface treatment liquid in the surface treatment tank from the circulation pipe connected to the pit, and is collected by the filter provided in the circulation pipe.

Then, the surface treatment liquid from which sludge has been removed by the filter is circulated and supplied to each riser pipe through each branch pipe connected to the circulation pipe, sprayed from the nozzle of each riser pipe, and returned to the surface treatment tank again. Be done.

As a result, sludge settled on the bottom of the surface treatment tank is automatically removed during the operation of the surface treatment apparatus.

〔Example〕

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 is a front view showing an example configuration of a surface treatment apparatus according to the present invention, and FIG. 2 is a time chart showing its operation.

In this example, two pairs of riser pipes R _{1 to} R ₇ extending in the width direction along the bottom 2 of the surface treatment tank 1 into which the object W is immersed are the lengths of the surface treatment tank 1. The riser pipes R _{1 to} R ₅ are arranged at predetermined intervals in the direction, in that order from the outlet side of the workpiece W toward the inlet side, and the remaining riser pipes R ₆ , R ₇ are arranged in that order from the inlet side to the outlet side, and between the riser pipes R ₇ and R ₅ , a pit 3 which is a sludge accumulation is formed in the bottom 2 of the tank. There is.

The riser pipes R ₁ and R ₂ are provided along the slope bottom 2a on the outlet side, and the riser pipes R ₆ and R ₇ are provided along the slope bottom 2b on the inlet side.

Further, each riser pipe R _{1 to} R ₇ has a bottom 2 of the surface treatment bath 1.
The nozzle 4 for injecting the surface treatment solution toward the pit 3
It is installed with an inclination in the direction of.

Next, in the pit 3, a pump 5 for withdrawing sludge accumulated therein together with the surface treatment liquid in the surface treatment tank 1,
A circulation pipe 7 is connected with a filter 6 for collecting the extracted sludge.

The circulation pipe 7 is connected to the riser pipes R _{1 to} R ₇ through the branch pipes 9 and 9 provided with the automatic valves V _{1 to} V _{7 that} are opened and closed by the control signal output from the control panel 8. Has been done.

The control panel 8 includes branch pipes 9 and 9 connected to the riser pipes R _{1 to} R ₅ and R ₆ and R ₇ arranged side by side in the same direction toward the pit 3.
... automatic valve V ₁ ~V ₅ and V _6, the V _7, respectively distant riser tubes R _1, automatic valve of each branch pipe 9 connected to R ₆ from the pit 3
The opening and closing control is performed in order from V ₁ and V _{6 with} a delay of a certain time T.

The automatic opening / closing control of automatic valves V ₆ and V ₇
Following the sequential opening / closing control of V _{1 to} V ₅ , it is performed with a time delay of T. Therefore, the automatic valves V _{1 to} V ₇ are sequentially controlled to be opened / closed with a constant time delay. ing.

Therefore, during operation of the surface treatment device, automatic valves V _{1 to} V ₇
Are opened and closed in that order, and each riser pipe is connected to R ₁ , R ₂ ,
The surface treatment liquid is started to be jetted from the nozzle 4 in sequence of R ₃ , R ₄ , R ₅ , R ₆ , R ₇ with a time delay of T.

As a result, first, the sludge settling to the most outlet side of the surface treatment tank 1 is forced to flow to the riser pipe R ₂ side by the jet flow of the surface treatment liquid injected from the nozzle 4 of the riser pipe R ₁ .

At this time, since the riser tubes R ₂ is not ejecting the surface treatment solution, sedimentation sludge is transported to the riser tubes R ₂ side jets surface-treatment liquid ejected from the riser pipe R ₁ is, riser pipe R ₁
It is not pressed back to the side.

Next, the surface treatment liquid is ejected from the nozzle 4 of the riser pipe R ₂ with a delay of time T, and the sludge that has been forced to flow from the riser pipe R ₁ side is forced to flow to the riser pipe R ₃ side.

Then, after that, with a delay of time T, each riser pipe R ₃ , R ₄ ,
A surface treatment liquid sequentially sprayed from the nozzle 4 R _5, wherein the sludge is dropped are conveyed in the direction of the pit 3 in the pit 3.

Further, the nozzle 4 of the riser pipe R ₆ starts jetting the surface treatment liquid at a delay of time T after the nozzle 4 of the riser pipe R ₅ starts jetting the surface treatment liquid, and the surface treatment tank 1 is the most filled tank. Sludge that settles to the side is pressed and flowed to the riser pipe R ₇ side.

Then, after a time delay of T, the surface treatment liquid is started to be jetted from the nozzle 4 of the riser pipe R ₇ , and the sludge that has been forced to flow from the riser pipe R ₆ side is dropped into the pit 3.

The sludge thus accumulated in the pit 3 is extracted together with the surface treatment liquid in the surface treatment tank 1 through the circulation pipe 7 to the outside of the surface treatment tank 1 and is supplied to the filter 6 interposed in the circulation pipe 7. To be collected.

The surface treatment liquid from which sludge has been removed by the filter 6 is supplied to the riser pipes R _{1 to} R ₇ through the branch pipes 9, 9 ... And jetted from the nozzles 4 of the riser pipes R _{1 to} R _7. It is returned to the surface treatment tank 1 again.

In addition, the riser pipe stops the injection of the surface treatment liquid in order of R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , R ₆ , and R ₇ in this order, and at the same time, the riser pipe R ₂ After the injection of the surface treatment liquid is stopped, the surface treatment liquid is started to be injected from each of the riser pipes R _{1 to} R ₇ with a time delay of T sequentially.

As a result, the surface treatment liquid stored in the surface treatment tank 1 is constantly agitated, the pretreatment effect and the water washing effect are enhanced in the pretreatment tank and the water washing tank, and the coating composition is increased in the electrodeposition tank. The uniform dispersion of the pigment and prevention of sedimentation of the pigment improve the coating quality, and at the same time, the sludge settling at the bottom of the tank is automatically removed during the operation of the apparatus.

Therefore, it is not necessary to frequently perform a very troublesome work of completely draining the surface treatment solution stored in the surface treatment bath 1 and cleaning the bottom of the bath, and the labor and cost required for the work are significantly reduced. It

Further, as in the embodiment, after the injection of the surface treatment liquid is started from a large number of riser pipes R _{1 to} R ₅ toward the inlet side of the object to be treated W, it is discharged from a small number of riser pipes R ₆ and R _7. If the surface treatment liquid is started to be jetted toward the tank side, the surface treatment liquid in the surface treatment tank 1 flows from the outlet side to the inlet side along the tank bottom 2 and the liquid surface , A surface flow that flows from the tank side to the tank side occurs.

Therefore, the object W to be treated contained in the surface treatment tank 1 can be treated effectively, and dust or bubbles floating on the liquid surface, paint dregs, or the like is provided on the outlet side by being placed on the surface flow. It can be dropped into a sub-tank (not shown), and the dust and the like can be prevented from adhering to the surface of the workpiece W.

If the bottom 2 of the surface treatment tank 1 is formed so as to gradually incline downward from the riser pipe R ₃ side toward the pit 3 as shown in FIG. 1, riser pipes R _{3 to} R ₅ The transportation efficiency of the settled sludge becomes very good.

Further, in the above embodiment, all the automatic valves V _{1 to} V ₇ are controlled to be opened and closed in sequence, but with the automatic valves V ₁ and V ₆ opened,
The other automatic valves V _{2 to} V ₅ and V ₇ may be sequentially opened / closed in that order.

Further, the sludge settled on the slope bottoms 2a, 2b can be relatively easily pressed and flowed, so that the surface treatment liquid is supplied to the riser pipes R ₃ , R ₄ , R ₅ provided on the flat tank bottom 2. The automatic valves V ₃ , V ₄ , and V ₅ may be sequentially opened and closed in that order.

Further, in the present invention, the control panel 8 is configured such that the automatic valves V _{1 to} V
₇ is divided into one connected to the odd-numbered riser pipes toward pit 3 and one connected to the even-numbered riser pipes, and both automatic valves are alternately opened and closed at predetermined timings. You may be allowed to do so.

Also in this case, the settling sludge can be pressed and flowed toward the riser pipe without being disturbed by the jet flow of the riser pipe adjacent to the pit 3.

Further, since the control for automatically opening and closing the automatic valves V _{1 to} V ₇ in two sets at once is relatively simple, the cost of the control panel 8 can be very low.

[Effect of device]

As described above, according to the present invention, the sludge settled in the surface treatment tank is effectively accumulated in the pit recessed at the bottom of the surface treatment device during the operation of the surface treatment device, and the sludge is accumulated in the pit. Since it is collected by the filter of the connected circulation pipe, it is not necessary to frequently perform the troublesome work of completely draining the surface treatment solution stored in the surface treatment tank and cleaning the bottom of the surface treatment tank. It has a great effect that the labor and cost required for it are significantly reduced.

[Brief description of drawings]

FIG. 1 is a front view showing an example configuration of a surface treatment apparatus according to the present invention, and FIG. 2 is a time chart showing its operation. Explanation of symbols 1 …… Surface treatment tank, 2 …… bottom of the tank, 3 …… pits, R _{1 to} R ₇
...... Riser pipe, 4 ... Nozzle, 5 ... Pump, 6 ...
Filter, 7 ...... circulation pipe, 8 ...... control panel, 9 ...... branch pipe, V ₁ ~V ₇ ...... automatic valve.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location C25D 17/00 K 21/18 E

Claims (3)

[Scope of utility model registration request] 1. A riser pipe (R _{1 to} R ₇ ) extending in the width direction along a bottom (2) of a surface treatment tank (1) for immersing an object (W) to be treated is the surface treatment tank (1). 1) The riser pipes (R ₁ ~
A nozzle (4) for injecting the surface treatment liquid toward the bath bottom (2) of the surface treatment bath (1) is provided in R ₇ ) in the direction of the pit (3) recessed in the bath bottom (2). The sludge accumulated in the pit (3) together with the surface treatment liquid in the surface treatment tank (1) is extracted by the pump (5) and collected by the filter (6) in the pit (3). The surface treatment liquid from which the sludge has been removed is passed through the riser pipes (R ₁ ~
A circulation pipe (7) for injecting from the nozzle (4) of R ₇ ) and returning to the surface treatment tank (1) again is connected, and the circulation pipe (7) is connected to each automatic valve (V _{1 to} V). branch of a plurality of provided ₇₎ through (9), wherein each riser tube (R ₁
~ R ₇ ) and further connected to each riser pipe (R _{1 to} R ₇ ) in the same direction toward the pit (3), the automatic valve (V ₁ ) of the branch pipe (9) ~ V ₇ ) is characterized by being provided with a control panel (8) for sequentially opening and closing with a certain time delay from the automatic valve of the branch pipe connected to the riser pipe far from the pit (3). Dip type surface treatment device. 2. The dip according to claim 1, wherein the tank bottom (2) of the surface treatment tank (1) is formed so as to be inclined downward toward the pit (3). Type surface treatment equipment. 3. Riser pipes (R _{1 to} R ₇ ) extending in the width direction along the bottom (2) of the surface treatment tank (1) for immersing the object (W) to be treated are the surface treatment tank (1). 1) The riser pipes (R ₁ ~
A nozzle (4) for injecting the surface treatment liquid toward the bath bottom (2) of the surface treatment bath (1) is provided in R ₇ ) in the direction of the pit (3) recessed in the bath bottom (2). The sludge accumulated in the pit (3) together with the surface treatment liquid in the surface treatment tank (1) is extracted by the pump (5) and collected by the filter (6) in the pit (3). The surface treatment liquid from which the sludge has been removed is passed through the riser pipes (R ₁ ~
A circulation pipe (7) for injecting from the nozzle (4) of R ₇ ) and returning to the surface treatment tank (1) again is connected, and the circulation pipe (7) is connected to each automatic valve (V _{1 to} V). branch of a plurality of provided ₇₎ through (9), wherein each riser tube (R ₁
~ R ₇ ) and further connected to each riser pipe (R _{1 to} R ₇ ) in the same direction toward the pit (3), the automatic valve (V ₁ ) of the branch pipe (9) ~ V ₇ ) are divided into those connected to the odd-numbered riser pipes toward the pit (3) and those connected to the even-numbered riser pipes, and both automatic valves are set at predetermined timings. A dip-type surface treatment device, characterized in that a control panel (8) for alternately controlling opening and closing is provided.