JP2003313687A - Cleaning apparatus for pretreatment of painting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning apparatus for pretreatment of painting, which completely cleans foreign materials deposited on an oil adhering to the car body in a cleaning step before a degreasing step, in a pretreatment process carried out before painting a car body. <P>SOLUTION: The cleaning apparatus 1 for the pretreatment is used in the pretreatment process S1 for sequentially performing at least a pre-cleaning step S11, the degreasing step S12, and a first rinsing step S13, prior to painting the car body C, and has a degreasing tank 12 used in the degreasing step S12 and a first rinsing tank 13 used in the first rinsing step S13, which are sequentially and juncturally installed. The cleaning apparatus is characterized by tilting a car body C when transporting it from the degreasing tank 12 to the first rinsing tank 13, to form a liquid mixture through mixing a degreasing liquid heated in the degreasing tank 12 with water in the first rinsing tank 13, and using the liquid mixture heated by the heat of the degreasing liquid for cleaning of the pre-cleaning step S11. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pretreatment cleaning apparatus for coating which removes foreign matter such as iron powder or the like adhering to and remaining on a vehicle body in a pretreatment before coating a vehicle body such as an automobile.

[0002]

2. Description of the Related Art Conventionally, the process of painting a vehicle body of an automobile or the like consists of a pretreatment process and a painting process. Among them, the pretreatment process mainly includes a washing process for washing the vehicle body and a degreasing process for removing oil attached to the vehicle body.

As a pretreatment cleaning device used in the pretreatment step, iron powder or the like adhered to the vehicle body by directing the tip of the pipe toward the conveyance path of the vehicle body and causing water to collide and diffuse inside the vehicle. (Japanese Patent Application No. 2000-288317). This pretreatment cleaning device uses a large amount of normal-temperature industrial water as its treatment liquid because it performs a wide range of cleaning by utilizing the force and dispersion of the water flow due to the collision and diffusion of water.

[0004]

However, in the pretreatment cleaning device as described above, since the cleaning is performed with industrial water at room temperature, the oil attached to the vehicle body is solidified especially at low temperatures such as winter, and the iron adhered thereto In some cases, powder etc. could not be completely removed. For this problem, there is an attempt to remove the above-mentioned deposits by heating industrial water to a predetermined temperature, but heating a large amount of industrial water to a predetermined temperature requires a lot of fuel cost. However, this is not preferable because the production cost due to the fuel cost increases.

As a technique for solving the above-mentioned problem of oil solidification, a technique of using the hot water of the hot water washing process in the washing process before the degreasing process in a pretreatment process in which a hot water washing process of washing with hot water is performed after the degreasing process. Is disclosed in Japanese Examined Patent Publication No. 54-13455. However, even with this technology,
Since a large amount of industrial water is heated in the hot water washing process, the production cost due to the fuel cost increases, which is not preferable.

Therefore, an object of the present invention is to perform a pretreatment before the painting of the vehicle body so that the foreign matter adhering to the oil on the vehicle body can be completely washed in the washing step before the degreasing step. It is to provide a processing cleaning device.

[0007]

The invention according to claim 1 of the present invention, which has solved the above-mentioned problems, provides a pretreatment cleaning for coating in which at least a pre-cleaning tank, a degreasing tank and a water-washing tank are sequentially connected. In the device, when the vehicle body is transferred from the degreasing tank to the water washing tank, the vehicle body is tilted and pulled up, so that the degreasing liquid heated in the degreasing tank is pumped up to the water in the water washing tank. It is characterized in that a mixed liquid of water and a degreasing liquid mixed in the water washing tank is used in the preliminary washing tank.

According to the first aspect of the present invention, when the vehicle body is transferred (conveyed) from the degreasing tank to the water washing tank, the vehicle body is inclined and transferred, so that the vehicle body becomes, for example, a bag-like shape. Degreasing liquid is pumped up in the part and transferred to the water washing tank. When this degreasing liquid mixes with the water in the washing tank, the calorific value of the degreasing liquid heated in the degreasing tank is given to the water, and the temperature of the mixed liquid is raised. Then, the heated mixed liquid is returned to the preliminary cleaning step and used for the cleaning. In the preliminary cleaning step, the temperature of the cleaning liquid becomes high and the cleaning liquid mixes with the degreasing liquid, so that the solidification of the oil on the vehicle body is alleviated and the foreign matter is cleaned cleanly.

According to a second aspect of the present invention, in the structure of the first aspect of the invention, the height of the liquid surface of the preliminary cleaning tank is set lower than the height of the liquid surface of the water washing tank, so that the mixed liquid is formed. Is flowed from the water washing tank to the side of the preliminary washing tank by using gravity.

According to the invention of claim 2, claim 1
In addition to the operation according to the invention described in (1), since the height of the liquid surface of the pre-wash tank is lower than the height of the liquid surface of the washing tank, the mixed liquid mixed in the washing tank naturally utilizes the pre-wash tank by using gravity. Supplied to the side. Here, it suffices if the mixed solution is allowed to flow to the side of the preliminary cleaning tank, for example, the mixed solution may be allowed to flow into the preliminary cleaning tank, or the cleaning solution from the preliminary cleaning tank is temporarily stored before being supplied to the cleaning solution injection device. It may be poured into a settling tank for keeping.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The details of a pretreatment system for cleaning a coating according to the present invention will be described below with reference to the drawings. In this embodiment, as shown in FIG. 1, the present invention is applied to a pretreatment cleaning apparatus 1 used in a pretreatment step S1 performed before painting a vehicle body. Here, this pretreatment step S
In 1, the preliminary washing step S11, the degreasing step S12, the first water washing step S13, the second water washing step S14, and the final dip water washing step S15 are sequentially performed.

As shown in FIG. 1, the pretreatment cleaning apparatus 1 includes a preliminary cleaning tank 11 used in the preliminary cleaning step S11, a degreasing tank 12 used in the degreasing step S12, and a first water washing step S1.
3, first washing tank 13 used for the second washing step S14, second
The water washing tank 14 and the dip (Dip) water washing tank 15 used in the final dip water washing step S15 are sequentially connected to each other. Then, at least in the pretreatment step S1, an overhead conveyor (not shown) for holding and transporting the vehicle body C so that it can be horizontally, forwardly inclined, or backwardly inclined is provided with the preliminary cleaning tank 11, the degreasing tank 12, and the dip washing tank. It is provided so as to move along the inner wall of 15. In addition, this overhead conveyor is used in the first water washing step S13 and the second water washing step S14 while the vehicle body C is in a horizontal state.
It is provided so as to move above 3,14.

The preliminary cleaning tank 11 includes front and rear walls 11a, 1
Since 1b is formed at approximately 45 ° with respect to the bottom wall 11c, it is formed with a size in consideration of the length of the pre-cleaning tank 11 in the carrying direction (front-back direction) and the increase of the carrying distance of the vehicle body C. There is. Here, the depth of the preliminary cleaning tank 11 is about 2.5 m, and the length of the bottom wall 11c in the front-rear direction is about 5.4 m. The settling tank 3 is provided below the preliminary cleaning tank 11 via the communication pipe 2.
Is provided.

The communication pipe 2 is arranged so as to communicate with the interiors of the preliminary cleaning tank 11 and the sedimentation tank 3. Further, the communication pipe 2 is formed such that the bottom portion thereof is inclined downward from the preliminary cleaning tank 11 toward the settling tank 3,
The diameter on the upstream end side gradually increases toward the downstream side.

In the settling tank 3, the cleaning liquid from the preliminary cleaning tank 11 is temporarily stored via the communication pipe 2, and the stored cleaning liquid is pumped by the pump P1 through the pipe T1 to the preliminary cleaning tank 1.
1 is supplied to the cleaning liquid jetting devices 4 ,. Further, the settling tank 3 is provided with an auto valve A1 at the bottom thereof, and a pipe T2 provided so as to communicate with the inside thereof and the inside of the first water washing tank 13. The upstream end of the pipe T2 is provided at a position higher than the downstream end, and an auto valve A2 is provided at an appropriate position on the settling tank 3 side. Further, the settling tank 3 is provided with a pipe T3 which is arranged so as to communicate with the inside of the settling tank 3 and the inside of the cyclone filter 5, and an appropriate position of the pipe T3 is an auto valve A3 and a pump P2 in order from the upstream side. Is provided. Incidentally, the auto valve A1
Is controlled so that when the pretreatment cleaning device 1 is stopped for a predetermined time, the pretreatment cleaning device 1 is automatically opened at the next start-up to discharge the sediment accumulated in the sedimentation tank 3. Further, the auto valves A2 and A3 may be manual valves that open and close manually.

The cyclone filter 5 is provided with a pipe T4 which communicates with the inside of the cyclone filter 5 and the inside of the preliminary cleaning tank 11, and an auto valve A4 is provided at an appropriate position of the pipe T4. Here, this cyclone filter 5
Is for purifying the cleaning water containing foreign matter (sludge) such as iron powder that sinks to the bottom of the settling tank 3, and the purified cleaning water passes through the pipe T4 provided at the upper portion of the preliminary cleaning tank 1.
Returning to 1, the separated sludge is discarded below. Further, in this cyclone filter 5, in order to efficiently discharge the deposits therein, the auto valve A3 and the auto valve A4 are alternately opened and closed to discharge under pressure.

Further, an auto filter F provided for the same purpose as the cyclone filter 5 is provided with a preliminary cleaning tank 11
To the pipe T5. A pump P3 is provided at an appropriate position of the pipe T5. Here, the auto filter F is for removing fiber dust and the like from the cleaning water in the preliminary cleaning tank 11, and the purified cleaning water is returned to the preliminary cleaning tank 11 through the pipe T5 to separate the separated fibers. Garbage is thrown down.

The degreasing tank 12 and the dip washing tank 15 are
It has substantially the same structure as the preliminary cleaning tank 11, and the depth, the length in the front-rear direction, etc. are set to appropriate values. On the other hand, the front and rear walls of the first washing tank 13 and the second washing tank 14 are formed substantially perpendicular to the bottom wall. The first washing tank 13 is provided with a pump P4 for supplying the water accumulated inside to the shower 13a.
The water that has accumulated inside the second washing tank 14 is also showered 14a.
Is provided with a pump P5. As the cleaning water used in the preliminary cleaning tank 11 and the water stored in the first cleaning tank 13, the second cleaning tank 14 and the dip cleaning tank 15, industrial water at room temperature is used. There is. Further, a degreasing liquid (surfactant) is stored in the degreasing tank 12, and as the degreasing liquid, for example, model numbers EC90L and EC90R manufactured by Nippon Paint are used. Then, this degreasing liquid is about 45 to 46 in the degreasing tank 12.
It is stored while being heated to about ℃. Further, the height of the liquid surface of the preliminary washing tank 11 is lower than the height of the liquid surface of the first washing tank 13, so that the liquid in the first washing tank 13 flows by gravity into the sedimentation tank 3 on the side of the preliminary washing tank 11. It has become.

Next, the vehicle body C by this pretreatment cleaning device 1
The cleaning method will be described. First, the preliminary cleaning step S1
1, the vehicle body C has inner walls 11a to 1a of the preliminary cleaning tank 11.
When it is conveyed along 1c, it is cleaned by the cleaning liquid sprayed from the cleaning liquid spraying device 4. Then, the degreasing step S
In 12, the vehicle body C is conveyed along the inner wall of the degreasing tank 12, so that the vehicle body C is immersed in the degreasing liquid and the oil content on the surface is decomposed. Then, the vehicle body C is taken out from the degreasing tank 12 in a state of being tilted forward (the rear portion of the vehicle body C is directed forward in the transport direction). At this time, the body C that leans forward
In addition to the degreasing liquid adhering to the outer surface thereof, the degreasing liquid accumulates in the bag-shaped portion on the front part thereof. Then, in the next first washing step S13, the first washing tank 13
The vehicle body C is leveled above and washed with water by the shower 13a. At this time, a large amount of the degreasing liquid accumulated in the front part of the vehicle body C is supplied into the first washing tank 13 by leveling the vehicle body C, and the degreasing liquid deposited on the outer surface of the vehicle body C is removed. It is washed away and supplied into the first water washing tank 13. After that, the vehicle body C is conveyed to the next drying step (not shown) and the like through the second water washing step S14 and the final dip water washing step S15. If the angle when pulling up the vehicle body C from the degreasing tank 12 is set to about 35 ° to 45 ° with respect to the horizontal, the degreasing liquid is positively pumped up in the bag-shaped portion of the vehicle body C as described above. Therefore, it is desirable to set in this way.

When a large amount of degreasing liquid is supplied from the degreasing tank 12 to the first washing tank 13 via the vehicle body C as described above, the water in the first washing tank 13 is mixed with the degreasing liquid, and the mixture thereof is mixed. The temperature of the liquid is raised by the heat of the degreasing liquid. The liquid mixture thus heated is supplied to the sedimentation tank 3 through the pipe T2, and the liquid mixture and the cleaning liquid are mixed in the sedimentation tank 3. Then, the mixed liquid is sprayed from the cleaning liquid spraying device 4 through the pipe T1 by the pump P1.

By repeating the above-mentioned operation, the water in the first washing tank 13 is gradually heated as a mixed liquid, and the temperature becomes about 30 ° C. in the stable period. In this way, in the stable period, mixed water containing degreasing liquid at about 30 ° C. is always supplied to the preliminary cleaning step S11.

According to the above, the following effects can be obtained in this embodiment. (1) Since the mixed liquid heated by the heat of the degreasing liquid is used for the cleaning in the preliminary cleaning step S11, the oil attached to the vehicle body C does not solidify even at a low temperature such as in the winter, and the foreign matter attached to the oil is removed. Can be thoroughly washed. In addition, since the mixed liquid containing the degreasing liquid is used as the cleaning liquid for the preliminary cleaning, most of the oil attached to the vehicle body C can be removed by the components of the degreasing liquid before the degreasing process. Therefore, the oil can be removed twice in the preliminary cleaning step S11 and the degreasing step S12.
The oil will be surely removed from the vehicle body C when the process is completed. (2) By lowering the height of the liquid surface of the preliminary washing tank 11 to be lower than the height of the liquid surface of the first water washing tank 13, the mixed liquid can be naturally supplied without using a pump or the like, so that the manufacturing cost is low. can do. (3) When the pretreatment cleaning apparatus 1 is stopped for a predetermined time, the auto valve A1 provided at the bottom of the settling tank 3 is automatically opened at the time of the next start to discharge the sediment accumulated in the settling tank 3. Therefore, the precipitate accumulated in the settling tank 3 can be reliably removed before the apparatus is activated. (4) Since the diameter of the communication pipe 2 on the upstream end side gradually increases toward the downstream side, it is possible to reliably prevent the communication pipe 2 from being clogged with foreign matter or the like.

As described above, the present invention is not limited to the above embodiment and can be implemented in various forms. (I) Instead of the cyclone filter 5 in this embodiment, a centrifuge for centrifuging water and iron powder may be provided. By using the centrifuge in this way, water and iron powder and the like can be easily separated. (Ii) The degreasing liquid may be contained in advance in the cleaning water in the preliminary cleaning tank 11 of this embodiment. In this way, the oil can be decomposed in the preliminary cleaning step S11 even before the pretreatment cleaning device 1 enters the stable period. (Iii) In the present embodiment, the pretreatment step S1 is composed of the preliminary cleaning step to the final dipping step S11 to S15, but the present invention includes at least the preliminary cleaning step, the degreasing step, and the water washing step. Any other process may be used.

(Iv) The pipe T1 of this embodiment may be provided with a heater such as a heater for heating the cleaning liquid passing through the pipe T1. With such a structure, the vehicle body C can be washed with the heated washing water even before the stable period, so that the oil attached to the vehicle body C does not always solidify at a low temperature such as in the winter, and foreign matter attached to the vehicle body C does not always solidify. Can be thoroughly washed. Further, in this case, it is preferable that the heater is controlled so that the cleaning liquid in the pipe T1 is heated only until the pretreatment cleaning device 1 enters the stable period. According to such a configuration, as compared with the conventional structure in which a hot water washing process that always uses heated water is provided, it is sufficient to drive the heater only until the stable period is reached, so the cost is reduced accordingly. Can be lowered. Further, since this heater needs to heat only a small amount of washing water flowing through the pipe T1, it is possible to use a heater having a small capacity, and the cost can be reduced accordingly.

[0025]

According to the invention as set forth in claim 1, since the mixed liquid heated by the heat of the degreasing liquid is used for cleaning in the preliminary cleaning step, it adheres to the vehicle body even at low temperatures such as in winter. The foreign matter adhering to the oil can be completely cleaned without the oil solidifying. In addition, since the mixed liquid containing the degreasing liquid is used as the cleaning liquid for the preliminary cleaning, most of the oil attached to the vehicle body can be removed by the components of the degreasing liquid before the degreasing process. Therefore, the oil can be removed twice in the pre-cleaning step and the degreasing step, so that the oil can be reliably removed from the vehicle body when these two steps are completed.

According to the invention of claim 2, claim 1
In addition to the effect according to the invention described in (1), by lowering the height of the liquid surface of the preliminary cleaning tank lower than the height of the liquid surface of the washing tank, it is possible to naturally supply the mixed liquid without using a pump, etc. Can be lowered.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a pretreatment cleaning device according to the present invention.

[Explanation of symbols]

S1 pretreatment process S11 Pre-cleaning process S12 Degreasing process S13 First washing step S14 Second water washing step S15 final dip washing process 1 Pretreatment cleaning device 11 Pre-cleaning tank 12 Degreasing tank 13 First flush tank 3 settling tanks C body

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takeshi Sakamoto             1907 Hirata Town, Suzuka City, Mie Prefecture Honda Motor Co., Ltd.             Suzuka Works Co., Ltd. F-term (reference) 3B201 AA46 AB15 BB02 BB05 BB62                       BB92 BB94 BC01 CA01 CB12                       CC01                 4F042 AA09 DA01 DF16 DF34 ED05                 4K053 PA02 PA11 PA18 QA04 QA07                       RA07 RA64 SA04 SA06 TA08                       TA12 TA18 TA19 XA03 XA11                       XA24 XA26 XA45 YA06 YA07                       YA18

Claims (2)

[Claims] 1. A pretreatment cleaning apparatus for coating, wherein at least a pre-cleaning tank, a degreasing tank, and a water washing tank are sequentially connected to each other, wherein the vehicle body is tilted when the vehicle body is transferred from the degreasing tank to the water washing tank. By pulling it up, the degreasing liquid heated in the degreasing tank is pumped up by the vehicle body and mixed with the water in the water washing tank, and the mixed liquid of the water and the degreasing liquid mixed in the water washing tank is added to the preliminary cleaning tank. A pretreatment and cleaning device for painting, which is used in. 2. The height of the liquid surface of the preliminary cleaning tank is made lower than the height of the liquid surface of the water washing tank, so that the mixed liquid flows from the water washing tank to the side of the preliminary cleaning tank by using gravity. The pretreatment cleaning device for coating according to claim 1, wherein