JPH049878B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a surface treatment apparatus that performs electrodeposition coating and its pretreatment process.

[Background technology]

When electrocoating an object to be treated, the following procedure is usually used. That is,
The object to be treated is first subjected to pretreatment such as degreasing, surface conditioning, and chemical conversion treatment, and then electrocoated. Conventionally, there is a continuous type apparatus as shown in FIG. 8 as an apparatus for processing a large amount of objects to be processed. This surface treatment device includes a hot water washing tank 1,
Degreasing tank 2, first washing tank 3, second washing tank 4, surface conditioning tank 5, chemical conversion tank 6, third washing tank 7, fourth washing tank 8
and the fifth washing tank 9 are arranged in the above order.
The object to be treated 10 is sequentially conveyed to each tank by a chain conveyor 11 and subjected to immersion treatment. Alternatively, atomization by spraying may be carried out alone or in combination, if necessary. That is, in the hot water washing tank 1, the degreasing tank 2, the surface conditioning tank 5, the chemical conversion tank 6, and the fifth washing tank 9, the chain conveyor 11 is lowered so that the object to be treated 10 is immersed in the tanks. There is. At the outlet of each of the degreasing tank 2, the surface conditioning tank 5, and the chemical conversion tank 6, a sprayer 13 for spraying the treatment liquid of each treatment tank is provided. On the other hand, the first
In the fourth washing tanks 3, 4, 8, and 9, water from the washing tank is sprayed from a spray 13 to perform washing. In the figure, 14 is a spray riser 13 for spraying the treatment liquid.
This is a pump that supplies

This surface treatment apparatus has 15 entrances and exits for each dipping tank in order to avoid rapid descent and rise of the workpiece 10.
Since it is formed with a taper of ~30°, the immersion layer itself has to be large, requiring a large installation space. Moreover, in lines with a low production volume, continuous processing is performed at a slow conveyance speed, but the chemical in the processing liquid dries unevenly on the surface of the workpiece 10 before and after the chemical conversion tank 6, resulting in quality problems. Due to problems, it was not suitable for small-scale production of less than 5,000 units per month (1 unit/4 minutes).

In order to solve this problem, we adopted a tact method, in which the transport of the processed material is temporarily stopped in each processing tank.
There are two methods: immersion in a treatment liquid or spraying the treatment liquid.

As this tact-type device, there is one that combines a power & free conveyor (P&F) and a drop lift (D/L), or one that uses a hoist. However, with either method, problems remained. That is, P&F and D/
In the combination of L and L, the equipment is expensive, and the D/L has an opening for raising and lowering the lifter arm, and processing liquid vapor can enter through this opening, causing failure due to corrosion. There were problems such as difficulty in maintenance and management due to On the other hand, in the case of hoist type,
Since the hoist runs directly above each treatment tank, there are problems in that the electrical system and mechanical parts of the hoist are corroded by the vapor of the treatment liquid, and poor conductivity occurs.

[Purpose of the invention]

In view of these circumstances, this invention provides a surface treatment that is low cost, suitable for high-mix, low-volume production, and that does not damage equipment or cause poor conductivity due to processing liquid vapor. The purpose is to provide equipment.

[Disclosure of the invention]

In order to achieve such an object, the present invention is provided with a transport means for transporting the object to be processed and a large number of processing tanks, and the object to be processed is sequentially transported to each processing tank by the transport means and is filled with a processing liquid. The surface treatment equipment is configured to perform immersion in water to achieve a desired surface treatment, and the plurality of treatment tanks are covered with a hood, and the hood includes A groove that opens to the outside is formed across the area, and a rail is laid above the groove along this groove.
Runs, stops, and runs according to the built-in program.
An automatically traveling hoist that automatically performs each operation of lifting and lowering is suspended so as to be freely movable, and a hoist for the workpiece provided on the hoist faces into the hood from the groove. , the groove is provided with a leakage prevention means for preventing leakage of the atmosphere inside the hood, and the workpiece is supported by the hanger and transported to each processing tank according to the program and subjected to surface treatment. The gist of this paper is a surface treatment apparatus characterized by the following features:

Hereinafter, the present invention will be explained in detail with reference to the drawings showing embodiments thereof.

FIG. 1 schematically shows an embodiment of the surface treatment apparatus according to the present invention, FIG. 2 shows a part of the apparatus as viewed from the direction of travel, and FIG. 3 shows a part of the apparatus in cross section as seen from the side. As shown in the figure,
This surface treatment equipment includes a hot water washing tank 1, a degreasing tank 2, a first
The washing tank 3, the second washing tank 4, the surface conditioning tank 5, the chemical conversion tank 6, the third washing tank 7, the fourth washing tank 8, and the fifth washing tank 9 are arranged in the above order. These processing tanks 1 to 9 are covered with one hood (booth) 15. The hood 15 is made of, but not limited to, a steel plate or stainless steel. Food 15
A groove 15b is provided in the ceiling portion 15a over the entire length in the longitudinal direction. That is, food 15
is open to the outside through the groove 15b. The groove 15b has both side walls 15c connected to the ceiling 15.
It extends upward from a. Above the groove 15b,
A rail 16 is laid along this groove 15b. An automatically traveling hoist (hereinafter simply referred to as "hoist") 17 is suspended from the rail 16. The hoist 17 includes a control panel 18, a traveling motor 19, four traveling rollers 19a, and a lifting motor 20.
and a hanging tool 30. Hoist 17
is suspended by four rollers 19a placed on the rail 16, and is movable. The control panel 18 includes a programmable controller (not shown) that can freely program drive and stop of the travel motor 19 and the lifting motor 20. In other words, the programmable controller allows the hoist 17 to automatically perform each operation of running, stopping, lowering, and lifting at predetermined positions. The traveling motor 19 has four rollers 1
The hoist 17 is caused to travel by driving one of the hoists 9a. A cylinder 17a with a smooth surface is provided in a portion of the hoist 17 corresponding to the groove 15b. The lower end of the cylinder 17a is flared out. The hanging tool 30 is
It includes two chains 31 and a support member 32. The chain 31 has one end fixed to the drum 23. The drum 23 is rotated in forward and reverse directions by the lifting motor 20, thereby expanding and contracting the length of the chain 31. The other end of the chain 31 passes through the inside of the cylinder 17a and faces into the hood 15. The support member 32 includes a hanger 32a and a table 32b on which the object 10 to be processed is placed. The stand 32b is adapted to be suspended by a hanger 32a. The hanger 32a and the stand 32b are made of a corrosion-resistant conductive material such as stainless steel. An insulator 32c is placed on the top of the hanger 32a.
Two cylindrical members 32d are attached via. The cylindrical member 32d has its distal end connected to the other end of the chain 31, and is configured to fit into the cylinder 17a when the chain 31 is wound up and the length of the cylindrical member 32d is contracted. The cylindrical member 32d has a rounded tip and the lower end of the cylinder 17a is flared, so that it can fit smoothly into the cylinder 17a. In this way, by the columnar member 32d entering into the cylinder 17a, the supporting member 32 and the object to be processed 10
This prevents the hoist 16 from swinging during travel. Nylon brushes 21 are attached to each of the upper and lower edges of the groove 15b. As shown in FIG. 4, the nylon brush 21 is formed into a band shape, with its base portion 21a attached to both sides of the groove 15b, and its tip portion 21b.
cover the groove 15b so as to overlap at the center of the groove 15b. These nylon brushes 21, 21 are
This is provided as one of the leakage prevention means to prevent the atmosphere inside the hood 15 from leaking upward from the groove 15b. The hoist 17 is configured to move by pushing the tips 21b of the nylon brushes 21, 21 apart with a cylinder 17a. The surface of the cylinder 17a is
As mentioned above, since it is smooth, it is not subjected to any resistance from the nylon brush 21 when running. Therefore, the hoist 16 can be run stably without the support member 32 shaking due to resistance. Further, the nylon brush 21 is not scraped off due to friction and the processing liquid is not contaminated. Since the chain 31 is designed to pass inside the cylinder 17a, the chain 31 will not get caught in the nylon brush 21 during lifting or lowering. A duct 22 is connected to the side wall surface of the groove 15b between the upper and lower nylon brushes 21, 21. This duct 22 is connected to, for example, an exhaust device (not shown) such as a scrubber, and is used to reduce the pressure in the small chamber formed between the upper and lower nylon brushes 21, 21. In other words, this reduced pressure makes the leakage prevention of the atmosphere inside the hood 15 by the nylon brush 21 more efficient. In the figure, 24 is an oil pan that prevents the machine oil of the hoist from falling into the processing tank. Although not shown, a power supply trolley is disposed along the rail 16, and power is supplied to the hoist 17 via a power supply roller (not shown) that comes into contact with this trolley. There is.

A detailed explanation of the operation of this surface treatment equipment is as follows.
It is as follows. It goes without saying that the movement of the hoist 17 is programmed into the programmable controller in advance.

The object to be processed 10 is placed on the support member 32 .

The support member 32 is lifted up to the top.

The hoist 17 is moved to the top of the hot water washing tank 1.

The object to be treated 10 is suspended together with the support member 32 and immersed in hot water to remove dirt from the surface.

After the processing time, the object to be processed 10 is lifted up to the top together with the support member 32.

The hoist 17 is moved to the top of the degreasing tank 2.

The workpiece 10 is suspended together with the support member 32 and immersed in a degreasing liquid to perform degreasing. The degreasing liquid is
Use what is normally used. In degreasing tank 2,
A heater is installed to heat the degreasing liquid to around 50°C.

After a predetermined period of time, the object to be processed 10 is lifted up to the top together with the support member 32.

The hoist 17 is moved toward the surface conditioning tank 5. Before the hoist 17 reaches the surface conditioning tank 5, the workpiece 10 is transported to the outlet of the degreasing tank 2,
It passes between each spray 13 of the first washing tank 3 and the second washing tank 4. Each sprayer 13 is configured to spray degreasing liquid or water pumped up by a pump 14 onto the object 10 to be treated. Pump pressure is 0.3~2.0
It is set at around Kg/ ^cm2 . The spray 13 at the outlet of the degreasing tank 2 is used to ensure more reliable degreasing and to prevent the degreasing liquid from drying out. In other words, if the degreasing liquid hardens on the surface of the object to be treated 10, sufficient washing with water will not be possible, resulting in quality problems. First washing tank 3
and the second washing tank 4, as shown in FIG.
It includes an upper tank 41 provided with a spray 13 and a water storage tank 43. Water in a storage tank 43 is pumped up by a pump 14 and sprayed from a sprayer 13. The sprayed water returns to the storage tank 43 from a drain pipe 42 provided at the bottom of the upper tank 41.
Although not shown in the drawings, the storage tank 43 is provided with a water supply pipe so that the water in the storage tank 43 can be replaced with new water one after another.

The hoist 17 is stopped above the surface conditioning tank 5.

The workpiece 10 is suspended together with the support member 32 and immersed in a surface conditioning liquid to condition the surface. As the surface conditioning liquid, one that is commonly used is used.

After a predetermined period of time, the object to be processed 10 is lifted up to the top together with the support member 32.

The hoist 17 is moved toward the chemical conversion tank 6.
The object to be treated 10 is designed to pass between sprays 13 at the outlet of the surface conditioning tank 5 before reaching the chemical conversion tank 6 . The spray 13 at the outlet of the surface conditioning tank 5 is provided to spray the surface conditioning liquid pumped up by the pump 14 onto the object 10 to more reliably condition the surface.

The hoist 17 is stopped above the chemical conversion tank 6.

The object to be treated 10 is suspended together with the support member 32 and immersed in a chemical liquid to undergo chemical conversion treatment. A commonly used chemical liquid is used. Although not shown, the chemical conversion tank 6 is provided with a heater, and the chemical conversion liquid is heated to around 50°C.

After a predetermined period of time, the object to be processed 10 is lifted up to the top together with the support member 32.

The hoist 17 is moved toward the fifth washing tank 9. Before the hoist 17 reaches the fifth washing tank 9, the object to be treated 10 is sprayed at the outlet of the chemical conversion tank 6, the third washing tank 7, and the fourth washing tank 8.
It is designed to pass between 3. 1 spray each
3 is configured to spray the chemical liquid or water pumped up by the pump 14 onto the object 10 to be treated. The spray 13 at the outlet of the chemical conversion tank 6 is used to perform chemical conversion treatment more reliably.
This is to prevent the chemical conversion treatment solution from drying out. In other words, if the chemical conversion treatment liquid solidifies on the surface of the object to be treated 10, sufficient washing with water cannot be performed, resulting in a quality problem. Chemical tank 6
has a tapered bottom, and the pump's suction port is located above this tapered surface. This is done in order to prevent the sludge generated during the chemical conversion treatment from being collected at the bottom of the tapered surface and being sucked up by the pump 14. Third washing tank 7 and fourth washing tank 8
has the same structure as the first washing tank 3.

The hoist 17 is stopped above the fifth washing tank 9.

The object to be processed 10 is suspended together with the support member 32 and immersed in water, and then washed with water.

After a predetermined period of time, the object to be processed 10 is lifted up to the top together with the support member 32.

The hoist 17 is moved to the exit of the hood 15. The object to be treated 10 passes between the sprays 13 at the outlet of the fifth washing tank 9 before coming out of the hood 15. This spray 13 is for more reliably washing with water.

The workpiece 10 coming out of the hood 15 is lowered from the support member 32 and then sent to a subsequent process. The hoist 17 has a looped rail 16, so after lowering the workpiece 10,
It is designed to return to the hood 15 entrance side.

Since this surface treatment device is as described above,
The electrical system and mechanical parts of the hoist 17 will not be damaged by adhesion of vapor generated from each processing tank, or conduction failure will occur. The leakage prevention means is particularly effective when the hood is filled with droplets of liquid due to spraying, as in this embodiment. Costs can be reduced by using an automatically traveling hoist. Moreover, since it is an automatically traveling hoist, it is possible to more accurately adjust the immersion time in the processing tank compared to a manual hoist, resulting in better processing accuracy and stable quality.

FIG. 6 shows another embodiment of the surface treatment apparatus according to the present invention. As shown in the figure, in this surface treatment device, nylon brushes 21 are attached to both sides only at the upper edge of the groove 15b. In this embodiment, the cylindrical member 32d is formed of a member with a smooth surface and extends upwardly from the insulator 32c.
d passes between the nylon brushes 21. Further, a collar 15d is provided at the lower edge of the groove 15b.
are formed from both sides, and a gap is formed that is large enough for the columnar member 32d to pass through. In this embodiment, the collar 15d and the nylon brush 21 prevent the atmosphere inside the hood 15 from leaking from the groove 15b. Note that the structure other than the above is similar to that of the previous embodiment.

The surface treatment apparatus according to the present invention is not limited to the above embodiments. In the embodiment, the hoist 17 was running when the spray 13 was spraying the treatment liquid, but the hoist 17 may be temporarily stopped between sprays. In the case of the second embodiment as well, the duct 2
2 may be provided. In the embodiment, a nylon brush was used as the band-like flexible member, but a rubber plate material, for example, may also be used. In the embodiment, a chain was used, but a wire rope may also be used. In the embodiment, the pressure inside the small chamber was reduced by suction, but the pressure may be increased.

For example, as shown in Fig. 7, the electrodeposition coating tank 6
It can also be used for 0. The electrodeposition coating tank 60 is
A negative electrode 61 and a positive electrode 62 are provided. The negative electrode 61 is arranged so as to face into the electrodeposition coating liquid 65. The positive electrode 62 is provided at the upper edge of the electrodeposition coating tank 60.

Electrodeposition coating is performed, for example, as follows. That is, the workpiece 10 whose front surface treatment has been completed as in the embodiment described above is carried to the top of the electrodeposition coating tank 60 by the hoist 17 while being supported by the support member 32. The object to be treated 10 is suspended to a predetermined position and immersed in the electrodeposition coating liquid 65. When the hanger 32a is hung down to a predetermined position, the protruding pieces 32e protruding from both sides of the hanger 32a are connected to the positive electrode 62. Next, the electrodes are energized. The object to be treated 10 is connected to the anode 62 via the stand 32b and the hanger 32a, so that it serves as an anode, and the electrocoating liquid 65 carrying a negative charge is electrodeposited thereon. Hoist 17 and hanger 32
Since the hoist 1 is electrically insulated from the hanger 32a by the insulator 32c, even if the hanger 32a is energized, the hoist 1
7 control section is not affected. In FIG. 7, 70 is a fan for exhausting the atmosphere inside the hood 15.

In the embodiment, degreasing was carried out only by immersion, but the degreasing tank may be structured like an electrodeposition coating tank to perform electrolytic degreasing.

〔Effect of the invention〕

Since the surface treatment apparatus according to the present invention is configured as described above, it is suitable for low-cost, high-mix, low-volume production, and also prevents equipment such as conveyance means from being damaged by treatment liquid vapor. This eliminates the possibility of malfunction.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram illustrating one embodiment of the surface treatment apparatus according to the present invention, FIG. Fig. 3 is a sectional view of the brush as seen from the side, Fig. 4 is a perspective view of the nylon brush, Fig. 5 is a sectional view of the first to fourth washing tanks as seen from the direction of movement of the hoist, and Fig. 6 is a sectional view of the invention. FIG. 7 is a cross-sectional view of the electrodeposition coating tank viewed from the direction of movement of the hoist, and FIG. 8 is a cross-sectional view of the groove portion illustrating the leakage prevention means of another embodiment of the surface treatment device. It is a schematic diagram explaining an apparatus. 1 to 9, 60... Processing tank (hot water washing tank, degreasing tank, surface conditioning tank, chemical conversion tank, 1st to 5th washing tank, electrodeposition coating tank), 15... Hood, 15a... Ceiling part, 15
b...Groove, 16...Rail, 17...Automatic traveling hoist, 17a...Cylinder, 21...Nylon brush (band-shaped flexible member), 30...Hanger, 31...
...Chain, 32...Support member.

Claims (1)

[Scope of Claims] 1. A method comprising a transport means for transporting the object to be processed and a large number of processing tanks, wherein the object to be processed is sequentially transported to each processing tank by the transport means and immersed in the processing liquid, The surface treatment apparatus is adapted to perform a desired surface treatment, and the plurality of treatment tanks are covered with a hood, and the hood has a groove that opens to the outside over the entire length in the ceiling. A rail is laid above it along this groove, and this rail has a
Runs, stops, and runs according to the built-in program.
An automatically traveling hoist that automatically performs each operation of lifting and lowering is suspended so as to be freely movable, and a hoist for the workpiece provided on the hoist faces into the hood from the groove. , the groove is provided with a leakage prevention means for preventing leakage of the atmosphere inside the hood, and the workpiece is supported by the hanger and transported to each processing tank according to the program and subjected to surface treatment. A surface treatment device characterized in that it is configured to 2. Claim No. 2, wherein the hanging tool includes a support member that supports the object to be processed within the hood, and a chain or wire rope that expands and contracts in length and raises and lowers the support member by driving the motor of an automatic traveling hoist. The surface treatment device according to item 1. 3. The surface treatment apparatus according to claim 1 or 2, wherein the leakage prevention means is a band-shaped flexible member provided on both sides of the groove so as to cover the groove. 4. The surface treatment device according to claim 3, wherein the portion that contacts the band-shaped flexible member of the automatic traveling hoist is formed of a member with a smooth surface. 5. The smooth member is a cylinder, and a chain or wire rope is used to raise and lower the support member through this cylinder, and the lower end of the chain or wire rope is flared out, and a part of the support member is attached to the cylinder. 5. The surface treatment apparatus according to claim 4, which enters into the cylinder from the lower end and prevents the workpiece and the support member from shaking when the hoist travels.