JPS6028908B2 - Chromate treatment device and chromate treatment method using the treatment device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chromate treatment apparatus and a chromate treatment method using the treatment apparatus.

Traditionally, this type of chromate treatment requires a nitric acid treatment solution,
The objects to be treated were immersed in a predetermined order into a treatment tank filled with a chromate treatment solution or washing water.

For example, in the case of chromate treatment, the steps are plating → water washing → nitric acid treatment → water washing → chromate treatment → water washing → dehydration → drying, and the object to be treated is plating tank → water washing tank → nitric acid treatment tank →
They were transported in the order of washing tank → chromate treatment tank → washing tank → dehydrator → dryer, and were submerged. According to this method, one processing tank or one processing machine is required for one process, and a large space is required to accommodate these processing tanks or one processing machine. It is necessary for the material to be processed to be transported between the processing tank and the processing machine, and the transport requires manpower or equipment, and there is a risk of damage to the material during transport. Mixing with each other or between the treatment solution and the cleaning water - Particularly in the case of chromate treatment, a considerable amount of hexavalent chromium is mixed into the cleaning water, which must be removed before it is drained. This method has the first drawback that the amount of hexavalent chromium removed is large.

The present invention improves the shortcomings of the above-mentioned conventional techniques, improves space efficiency, minimizes the transportation of objects to be treated, improves drainage, and allows mixing of treatment liquids with each other or mixing of treatment liquid and cleaning water. The purpose of this system is to prevent waste water from washing, and to effectively reuse cleaning wastewater to minimize emissions.
The processing tank is characterized by being porous and rotatable.

The present invention will be described with reference to an embodiment shown in the drawings. A is a surface treatment device, B is a nitric acid tank, C is a chromate liquid tank, D is a cleaning storage tank device, and E is a cleaning liquid spraying device. , and F is a hot air drying device.

Two or more chromate liquid tanks C may be provided depending on the type of chromate liquid, for example, colored chromate liquid, glossy chromate liquid, black chromate liquid, etc. In addition, the cleaning liquid storage tank D
It is desirable to provide two or more filters corresponding to each cleaning process so that the cleaning wastewater from each cleaning process does not mix. In the surface treatment apparatus A, a container 1 is supported from a base 11 via legs 12 and a spring 13. A rhombus 30 is pivotally attached to the upper part of the container 1 with a hinge 31, and a container 1 is attached to the outer periphery of the container 1. A liquid distribution tank 9 is provided which communicates with the interior through a communication hole 10, and a liquid drain pipe 28A is provided with an automatic valve MV interposed at the bottom.
, drain pipe 28B with automatic valve MN2 interposed, automatic valve MV4
The drain pipe 28A is connected to the nitric acid tank B, the drain pipe 28B is connected to the chromate liquid tank C, and the discharge pipe 29A is connected to the cleaning liquid storage tank D. Automatic valves here refer to solenoid valves, electric valves, etc. A rotary bearing 2 is suspended from the center of the bottom of the container 1, and a vertical rotary shaft 3 supported by a bearing 4 and sealed with a mechanical seal 5 passes through the rotary bearing 2.
A processing tank 6 having a large number of pores 23 is fixed by a fixing nut 8 at the upper end of the tank. Pulleys 16 and 17 are mounted on the lower end of the rotating shaft 3.
is the brake motor M via the belts 16A and 17A,
, M2 pulleys 14 and 15. In order to switch the rotation of the processing tank 6 into two stages of low speed and high speed, in addition to providing two brake motors M, M2 as in this embodiment, switching by gears or pulleys using a single drive source is also possible. The known switching method is applied. Nitric acid tank B,
From the chromate liquid tank C and the cleaning liquid storage tank D, liquid distribution pipes 24, 25, and 26 with pumps P, , P2, and P3 interposed, respectively, are extended and communicated with the liquid distribution tank 9. A level gauge L is arranged in the liquid distribution tank 9. The cleaning liquid injection device E is placed directly above the processing tank 6 in the container 1, and consists of a nozzle pipe 21 provided with a large number of holes 20, and the nozzle pipe 21 communicates with a cleaning liquid supply pipe 22 in which an automatic valve MV3 is interposed. The hot air drying device F is arranged on the top of the container 1 of the surface treatment device A, and consists of a cylinder body 27 with a jet pipe 27A at the tip, a hot wire 27B inside, and a blower 27C attached to the rear. 27C is controlled by the actuator. To perform chromate treatment using the above-mentioned surface treatment system, the object to be treated 18, such as a galvanized bolt, is filled into a wire mesh basket 7 having a pair of handles 19 on both sides of the upper edge. The lid 30 of the container is opened and the container is inserted into the processing tank 6.

After this, the lid 30 of the container 1 is closed, the automatic valve MV4 is closed while the brake motor M is driven to cause the processing tank 6 to rotate at low speed, intermittently or in reverse, and the pump P3 is turned on.
is operated to fill the container 1 with cleaning water from the cleaning liquid storage tank. The cleaning water is supplied until the object 18 in the treatment tank 6 is completely immersed, and the water level at that time is detected by the bell gauge L, and the pump P3 is stopped by a signal from the level gauge L to supply the cleaning water. cut off the supply of Intermittent rotation is, for example, repeating a cycle of forward or reverse rotation for 0.5 to 3 seconds and then stopping for 0.5 to 3 seconds.
Reverse rotation is, for example, intermittent reverse rotation in which forward rotation is performed for 0.5 to 3 seconds, then stopped for 0.5 to 3 seconds, then reverse rotation is performed for 0.5 to 3 seconds, and then stopped for 0.5 to 3 seconds. , refers to continuous reversal rotation in which forward rotation and reverse rotation are repeated, for example, for 0.5 to 3 seconds each without providing a stop period. During the above-mentioned low-speed rotation and reverse rotation, the objects 18 to be processed are pressed toward the outer wall of the processing tank 6 by centrifugal force, and are almost fixed, with almost no collision between the objects 18 and the objects 18 being processed. Only the washing water moves radially into the processing tank due to centrifugal force without damaging the objects, and thus the washing water is sufficiently distributed over the objects to be processed. Since the reverse rotation causes more disturbance than the cleaning water in the processing tank, the cleaning effect is further improved. When the pump P3 stops, if the processing tank 6 is being rotated intermittently or in reverse, it is switched to low speed rotation.
Then, the automatic valve MV is opened and the cleaning waste water in the container 1 is collected into the cleaning liquid storage tank D via the discharge pipe 29 (cleaning method 1), and/or the automatic valve MN3 is opened and the cleaning water is discharged from the cleaning liquid supply pipe 22 to the nozzle pipe 21. A cleaning method 2 is applied in which cleaning water is supplied and sprayed from the nozzle pipe 21 onto the objects 18 to be processed in the basket 7 inserted into the processing tank 6. In this way, the object to be treated 18 is effectively cleaned, and the cleaning waste water is collected from the discharge pipe 29 into the cleaning liquid storage tank D. Automatic valve M when cleaning is completed
Close V3 to stop the supply of cleaning fluid and, if desired, continue to do so for now to shake off the cleaning waste water. At this time, the amount of cleaning wastewater increases by the amount of cleaning water supplied from the nozzle pipe 21, but the amount corresponding to the increase in cleaning wastewater overflows from the cleaning liquid storage tank D. The cleaning water supplied from the nozzle pipe 21 dilutes the cleaning waste water and maintains it at a constant level of cleanliness. The above is the first cleaning step. Next, the low-speed rotation of the processing tank 6 is maintained as it is, or is switched to intermittent or reverse rotation, and the pump P is operated to fill the container 1 with the nitric acid solution via the liquid distribution pipe 24 and the liquid distribution tank 9.

The nitric acid solution is supplied until the material to be processed 18 in the processing tank 6 is completely immersed, and the liquid level at that time is detected by the level gauge L, and the pump P is activated based on the signal from the level gauge L.
, stops and cuts off the supply of nitric acid. After maintaining this state for about 3 to 5 seconds, if the processing tank 6 is being rotated intermittently or in reverse, switch to low speed rotation, open the automatic valve MN, and drain the nitric acid solution in the container 1 to the drain pipe 28A. from the nitric acid tank B. After most of the nitric acid solution in the container 1 has been discharged, the state is maintained for about 5 seconds to shake off the nitric acid adhering to the object to be treated. In this case, since the processing tank 6 is not rotating at high speed until the object to be processed 18 is immersed in the nitric acid solution after the first cleaning step, the surface is not completely dry and a monomolecular film of water remains. Therefore, the nitric acid treatment is performed in this state, and the treatment proceeds smoothly. The above is the nitric acid treatment step. Next, the processing tank 6 is kept rotating at a low speed, or is rotated intermittently or in reverse, and the above-mentioned cleaning method 1 and/or cleaning method 2 is applied. At this time, it is desirable to collect the washing wastewater in a separate washing liquid storage tank D so as not to mix it with the washing wastewater collected in the first washing step. In this way, the object to be treated 18 is effectively cleaned as in the previous case, and the cleaning waste water is discharged from the discharge pipe 29 to the cleaning liquid storage tank D.
will be collected.

When the cleaning is completed, the automatic valve MV3 is closed to stop the supply of cleaning liquid, and if desired, the state is continued for a while to shake off the cleaning waste water, and then the automatic valve MV4 is closed. In this case, since the treatment tank 6 is not rotating at high speed until the object 18 comes into contact with the washing water after the nitric acid treatment step, the nitric acid solution remaining on the surface of the object 18 is not dried and concentrated. Therefore, the object to be treated 18 is not corroded by the nitric acid solution. The above is the second cleaning step. If the automatic valve MN5 is set to close and the pump P2 is activated, the chromate solution in the chromate solution tank C is filled by the pump P2 into the distribution tank 9 and further into the container 1 via the distribution pipe 25, and the liquid is The level is adjusted by a level gauge LI that is interlocked with pump P2.

When the chromate solution in the container 1 reaches a predetermined level L, that is, the object to be treated is completely immersed, the pump P2 stops. During this time, the processing tank 6 either maintains low speed rotation or switches to intermittent or reverse rotation. After maintaining this state for a while, if the processing tank 6 is being rotated intermittently or in reverse, it is switched to low speed rotation and the automatic valve M is turned on.
N2 is opened and the chromate solution is collected from the container 1 through the drain pipe 288 into the chromate solution tank C. After most of the chromate solution in the container 1 has been discharged, the container 1 is left in that state, and the chromate solution adhering to the object to be treated is shaken off. During the chromate treatment, a monomolecular film of cleaning water remains on the surface of the object to be treated 18, and the chromate treatment proceeds smoothly under such conditions. The above is the chromate treatment step.
Next, the processing tank 6 is kept rotating at a low speed, or is rotated intermittently or in reverse, and the above-mentioned cleaning method 1 and/or cleaning method 2 is applied. At this time as well, it is desirable to collect the washing wastewater into a separate washing liquid storage tank D so as not to mix with the washing wastewater collected in the first washing step and the second washing step, respectively. When the cleaning is completed, the automatic valve My3 is closed to stop the supply of the cleaning method, and if desired, the cleaning method is continued for a while to shake off the cleaning waste water, and then the automatic valve hW4 is closed.

During the third cleaning step, the chromate solution remaining on the object to be treated is not dried and concentrated, so that the object to be treated is not corroded by the chromate solution. The above is the third cleaning step. As mentioned above, cleaning method 1 must be applied to one or more processes selected from the first cleaning process, second cleaning process, and third cleaning process.
should be applied to recover cleaning waste liquid.

Next, the brake motor rotates at high speed to ensure complete dehydration, and at the same time, the lid 30 of the container 1 is opened, the actuator is activated, and hot air is blown from the hot air dryer F onto the object for 3 to 5 minutes to dry it. complete. Stop the brake motor and hot air dryer F operating system. The above is the drying process. Since the chromate treatment is completed through the six steps described above, the work is completed by taking out the wire mesh basket 7 from the treatment tank 6.

The present invention is useful even when applied to any surface treatment other than the above embodiments, such as electrolytic plating, electroless finishing, zinc-chromium treatment, and others.

The above six steps can be sequenced, thus eliminating the need for any acquisition.

Since the present invention has the above-mentioned configuration, the equipment, manpower, etc. required for moving the object to be treated can be omitted, and the object to be treated in the porous treatment tank is immersed in the treatment liquid and is caused by centrifugal force together with the porous treatment tank. By being constrained, they almost collide with each other,
Because they rotate without damaging each other, the liquid to be treated is quickly distributed to the smallest details of the object, improving treatment efficiency and uniformly processing the object.

Further, since the processing liquid adhering to the object to be processed is centrifugally removed, the remaining amount is reduced, the recovery rate of the processing liquid is improved, and mixing of the processing liquids with each other is reduced. After the cleaning process, nitric acid process, and chromate treatment process, the processing tank is not rotated at high speed but at low speed or rotated in reverse to prevent the workpiece from drying completely until the subsequent processing. This aims to smooth the process and prevent corrosion caused by the processing liquid. Furthermore, since the cleaning waste water is collected in the cleaning liquid storage tank and used effectively, the amount of cleaning water required for cleaning is extremely small.
The amount of washing waste water is also reduced, and treatment is simple and easy.
Processing costs are also reduced.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a front sectional view, Fig. 2 is a perspective view of the main body of the surface treatment equipment, Fig. 3 is a perspective view of the porous treatment tank, and Fig. 4 is a cage. FIG. In the diagram: 1...Container, 3...Rotation axis, 6...
... Porous treatment tank, 18 ... Treated object, 21
... Nozzle pipe, 22 ... Cleaning liquid supply pipe, MV.
, MV2, MV3, MV4, MV5... automatic valve, L
... Level gauge, M,, M2 ... Brake motor, Day ... Hot air dryer operating device. 4 figures, 1 figure, 2 figures, 3 figures

Claims (1)

[Scope of Claims] 1. A container, a porous treatment tank installed in the container, a liquid distribution tank communicating with the container, a cleaning liquid spraying device for cleaning the contents in the porous treatment tank, and a porous treatment tank. It consists of a hot air drying device for drying the contents in the treatment tank, a nitric acid tank, a chromate solution tank, and a washing waste liquid storage tank. The nitric acid tank, chromate liquid tank, and cleaning waste liquid storage tank are operated by pumps P_1 and P_1.
_2, P_3 are connected to the liquid distribution tank by intervening liquid distribution pipes, and automatic valves MV_1, MV_2, MV_4
A liquid distribution tank is connected to the container by a drain pipe with an intervening liquid tank, a level gauge L is arranged in the liquid distribution tank, a cleaning liquid spraying device is connected with a liquid supply pipe with an automatic valve MV_3, and a hot air drying device A chromate treatment device characterized in that an actuating device H is attached to the chromate treatment device. 2. A container, a porous treatment tank installed in the container, a liquid distribution tank communicating with the container, a cleaning liquid spraying device for cleaning the contents in the porous treatment tank, and the contents in the porous treatment tank. The porous treatment tank has a rotating shaft in the vertical direction and can be rotated at high speed and in both forward and reverse directions by a drive device M. The nitric acid tank, chromate liquid tank, and washing waste liquid storage tank are rotated at low speed, and
2, P_3 are connected to the liquid distribution tank through liquid distribution pipes, and are also connected to the container through liquid drainage pipes in which automatic valves MV_1, MV_2, and MV_4 are interposed, and the liquid distribution tank has a level. In the chromate treatment equipment, a gauge L is arranged, a cleaning liquid spraying device is connected to a liquid supply pipe with an automatic valve MV_3, and a hot air drying device is equipped with an actuating device H. The processing tank is rotated at low speed by the drive device M, and cleaning water is filled into the container, and MV_4 is opened to collect the cleaning waste water from the discharge pipe to the cleaning liquid storage tank. MV_3 is closed. After that, close MV_4 while maintaining the low speed rotation of the processing tank P_1
MV_1 is opened to fill the container with nitric acid solution through the liquid distribution tank, stop P_1 at the liquid level L where the objects to be processed in the processing tank are completely immersed, and then open MV_1 to remove the nitric acid from the container. Nitric acid treatment step of recovering and shaking off the nitric acid solution, MV_1
The second cleaning process involves closing M and filling the container with cleaning water while maintaining the low speed rotation of the processing tank, and then opening MV_4 to collect the cleaning wastewater from the discharge pipe into the cleaning wastewater storage tank. Stop and interrupt the low-speed rotation of the processing tank, close MV_4 and activate P_2 to fill the container with chromate solution through the liquid distribution tank until the liquid level L is reached at which the object to be processed in the processing tank is completely immersed.
After stopping P_2, the porous treatment tank is rotated intermittently or in reverse by M, and then MN_3 is opened while rotating the treatment tank at low speed to collect the chromate solution from the container into the chromate solution tank and shake it out. Chromate treatment step, MV_2 is closed and cleaning water is filled into the container while maintaining the low speed rotation of the treatment tank, and MV_4 is further opened to collect the cleaning waste water from the discharge pipe into the cleaning liquid storage tank. Third cleaning step, MV_
3 is closed, the processing tank is rotated at high speed by M, and H is operated to shake off the remaining washing water and dry it. Consisting of the above steps, the first, second, and third cleaning steps operate P_3 while rotating the treatment tank at low speed by the drive device M to supply cleaning water from the cleaning liquid storage tank into the container. Cleaning method 1, in which P_3 is stopped at a water level where the objects to be treated in the treatment tank are completely immersed, and MV_4 is opened to collect the cleaning waste water from the discharge pipe into the cleaning liquid storage tank, and/or MV_3 is opened to drain the cleaning water. This is carried out by cleaning method 2, in which the cleaning liquid is sprayed onto the workpiece from a cleaning liquid spraying device, but cleaning is always performed in one or more steps selected from the first cleaning step, second cleaning step, and third cleaning step. A chromate treatment method characterized by applying Method 1. 3. A container, a porous treatment tank installed in the container, a liquid distribution tank communicating with the container, a cleaning liquid spraying device for cleaning the contents in the porous treatment tank, and the contents in the porous treatment tank. The porous treatment tank has a rotating shaft in the vertical direction and can be rotated at high speed in both forward and reverse directions by a drive device M. The nitric acid tank, chromate liquid tank, and cleaning waste liquid storage tank are connected to the liquid distribution tank through liquid distribution pipes with pumps P_1, P_2, and P_3, respectively, and automatic valves MV_1, MV_2, and MV_4 are connected to the liquid distribution tank. Each of them is connected to the container by an intervening drain pipe, a level gauge L is placed in the liquid distribution tank, and the cleaning liquid spraying device is connected to a liquid supply pipe with an automatic valve MV_3, and connected to a hot air drying device. is a chromate treatment apparatus equipped with an actuating device H, in which the object to be treated is accommodated in a porous treatment tank, the treatment tank is rotated at low speed by a drive device M, cleaning water is filled into the container, and the MV
The first cleaning step is to open _4 and collect the cleaning wastewater from the discharge pipe to the cleaning liquid storage tank, then close MV_3, and then close MV_4 while intermittent or reverse rotation of the treatment tank by M.
_1 is activated to fill the container with nitric acid solution through the liquid distribution tank, and at the liquid level L at which the object to be processed in the processing tank is completely immersed, P_1 is reached.
Then, while rotating the processing tank at low speed using M, MV_1 is opened to collect the nitric acid solution from the container into the nitric acid tank, and the nitric acid solution is shaken off. MV_1 is closed and the processing tank is rotated intermittently or in reverse. In the second step, cleaning water is filled into the container, and the treatment tank is rotated at low speed by M, and MV_4 is opened to collect the cleaning waste water from the discharge pipe to the cleaning liquid storage tank.
In the cleaning process, close MV_3 and then stop M to interrupt the low-speed rotation of the treatment tank if desired, or close MV_4 while maintaining the low-speed rotation of the treatment tank and operate P_2 to supply the chromate solution to the distribution tank. P_2 is stopped at a liquid level L at which the object to be processed in the processing tank is completely immersed in the container, and then the porous processing tank is rotated intermittently or in reverse by M, and then the processing tank is rotated at low speed. Chromate treatment process in which MV_2 is opened to collect the chromate solution from the container into the chromate solution tank and shaken out. MV_3 is closed, the treatment tank is rotated at high speed by M, and H is activated to remove the remaining cleaning water. A drying process that involves shaking off and drying. Consisting of the above steps, the first, second, and third cleaning steps operate P_3 while rotating the treatment tank at low speed by the drive device M to supply cleaning water from the cleaning liquid storage tank into the container. Cleaning method 1, in which P_3 is stopped at a water level where the objects to be treated in the treatment tank are completely immersed, and MV_4 is opened to collect the cleaning waste water from the discharge pipe into the cleaning liquid storage tank, and/or MV_3 is opened to drain the cleaning water. This is carried out by cleaning method 2 in which the cleaning liquid is sprayed onto the workpiece from a cleaning liquid spraying device, but cleaning is always performed in one or more steps selected from the first cleaning step, second cleaning step, and third cleaning step. A chromate treatment method characterized by applying Method 1.