JP2006334580A - Cap with pressure sensing valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cap with a pressure sensing valve which is free from intrusion of a liquid in a pretreatment and flying or falling down of a cap to remarkably prolong the life and facilitate the attaching and detaching work to improve work efficiency. <P>SOLUTION: An attachment flange 2 penetrated by a slid 4 is provided to be integrally provided to a tubular primary cap main body 1 which is the inserting part 14 of a tubular work 9 and is provided with a ring-like projecting part 3 in the inside of a hollow. An inscribed engaging part 6 is provided to be integrally with the primary cap main body insertion side 10 of a lid-like secondary cap main body 5 and a ventilation hole 7 and a lip board 8 are provided integrally with the back side 11 of the lid like secondary cap main body 5. A lip-like pressure sensing valve 13 is provided to the inside 12 of the lip board 8. The cap with pressure sensing valve is constituted so that the tubular primary cap main body 1 and the lid-like secondary cap main body 5 which are integrally formed respectively as the whole are covered to be in close contact with each other and assembled. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique added to a rubber cap for preventing the penetration of paint, chemicals, etc. into the pipe of a pipe product in the field of surface treatment such as electrodeposition coating and plating.

  Conventionally, pipe caps for electrodeposition coating and plating surface treatment have been provided with rubber caps. The purpose of use is to prevent the pretreatment liquid from entering the pipes. Alternatively, prevent treatment chemicals such as paint and plating solution from entering. Furthermore, it is to prevent dust and dust from entering.

However, when a conventional rubber cap enters a water draining drying oven or a baking drying oven, the rubber cap flies in the furnace due to the internal pressure increase. For this reason, the rubber caps in the drying furnace must be recovered at the end of the operation. Moreover, since it cannot be recovered unless the work is completed, it is exposed to a high temperature in the furnace for a long time, which causes rubber deterioration and the life of the rubber cap is greatly shortened. As a countermeasure, the rubber cap is designed with a tight mounting diameter so that it will not be blown in the furnace. Therefore, it is difficult to remove when removing the rubber cap, and the workability is extremely poor, causing the worst efficiency deterioration. Further, even if the rubber cap is dealt with tightly in this way, depending on the tubular work (9), that is, the pipe of the object to be coated, it will fly easily.
The present invention has been made to improve such problems.

As means for solving these problems, first, the invention according to claim 1 is a hollow primary cap body (1) which is an insertion part (14) of a tubular work (9) such as a pipe to be coated. A ring convex part (3) is provided inside. Further, a mounting collar (2) penetrated by a slide (4) is integrally provided at the head of the tubular primary cap body (1). All of these are formed by molding. On the other hand, an inward latching portion (6) is integrally provided on the primary cap body insertion side (10) of the lid-like secondary cap body (5) to be attached. In addition, a ventilation hole (7) and a lip disc (8) are provided integrally on the back side (11). The lip disc (8) is formed by arranging several vent holes (7) in a shape along the circumference. Further, on the inner side (12) of the lip disc (8), a lip-shaped pressure sensing valve (13) formed as a ring-shaped projection inscribed and intimately contacts the mounting collar (2) of the tubular primary cap body (1). Provide one.
Since these are also provided as a whole, they are formed by molding. In this way, the tubular primary cap body (1) and the lid-like secondary cap body (5), which are separately formed by molding, are covered with the inscribed hook portion (6) and the mounting collar (2). Close and complete in combination.

  Next, the invention according to claim 2 is a type in which the tubular primary cap body (1) is inserted into the tubular work (9), and has a feature of being formed in a stopper shape. The type of claim 1 is called an outer cap type, and the inner cap type is effective for large-sized pipe products.

  For the present invention, it is best to mold with the raw materials listed in claim 3.

  Since there was no intrusion of liquid during pre-treatment, cap jumping or falling off in the drying furnace, the service life was greatly increased. In addition, the installation and removal work has become easier, so the work efficiency has been improved and the cap collection work in the furnace at the end of the work has been eliminated, greatly improving work efficiency.

  The present invention relates to a rubber cap used to prevent masking of a surface of a pipe product or the like subjected to electrodeposition coating and plating, and intrusion of processing liquid, dust, and dust into the pipe. Even if the conventional product was installed, when it entered the drying furnace, the air pressure inside the pipe increased with the temperature rise, and the phenomenon of blowing away in the furnace was repeated. In other words, the conventional rubber cap is used by being inserted into the tubular work (9), which is a pipe product, but it is caused by being attached in a completely sealed state.

  A slit (4) was penetrated in part, and the rising internal pressure was released from here. However, since there is a washing process, etc., it is cooled at this time, the internal air pressure etc. becomes negative pressure, liquid, dust, dust etc. are sucked together with the outside air, and the tubular work is drawn from this slide (4). (9) will be invaded. In order to eliminate this phenomenon, a secondary cap is combined. The treatment process of the present invention will be described. Capturing the tubular work (9) → hanging frame → degreasing → washing → surface adjustment → chemical conversion film → water washing → electrodeposition coating → water washing → pure water washing → baking drying → normal cooling → The cap removal and such a series of processing steps are included.

  As a result of various verification experiments, the method of assembling the secondary cap to the primary cap was the best mode. According to the first aspect of the present invention, as shown in FIG. 1, the mounting collar (2) that is penetrated by the slide (4) is provided in the tubular primary cap body (1) provided with the ring protrusion (3). These are integrally formed by a molding technique. Next, the inscribed latching portion (6) is integrally provided on the skirt portion of the lid-shaped secondary cap body (5), that is, the primary cap body insertion side (10). The back side (11) is integrally provided with a vent hole (7) and a lip disc (8). The lip disc (8) is naturally formed by arranging several vent holes (7) in a shape along the circumference and punching them. Furthermore, a lip-shaped pressure sensing valve (13) formed as a ring-shaped protrusion, which is the essential know-how of the present invention, is also integrally provided on the inner side (12) of the lip disk (8). Thus, the whole lid-shaped secondary cap body (5) is also integrally formed by a molding technique. The mounting collar (2) of the tubular primary cap main body (1) formed separately in this way is covered with the inscribed latching portion (6) of the lid-like secondary cap main body (5) to be in close contact. Install and install. According to the second aspect of the present invention, the tubular primary cap body (1) is inserted into the tubular work (9) as shown in FIG. The lid-like secondary cap body (5) is similarly assembled and mounted as described in claim 1.

The present invention is configured as described above, and the mechanism and operation of each step of the cap mounted on the pipe product, that is, the tubular work (9) will be described below.
First, the cap of the present invention is attached to the tubular workpiece (9). Next, it is hung on the hanging frame of the line. Next, it enters a degreasing tank and is immersed in a liquid temperature of 40 ° C. to 50 ° C. Here, the air inside the tubular work (9) expands to become a high positive pressure, and the positive pressure inside the tubular primary cap body (1) is positive. This positive pressure air flows through the slide (4), positive pressure is applied to the lip disk (8) of the lid-like secondary cap body (5), and the lip pressure sensing valve (13) is pushed up. , It is discharged outside through the vent hole (7), and entry of the degreasing liquid is also prevented by this positive pressure phenomenon.
Moreover, since it becomes 230 degreeC in a baking drying furnace, the height of this pressure is in a severer situation.

  Also, with this mechanism, the inside of the cap was depressurized and no longer jumped off from the tubular work (9). Next, the temperature of the tubular work (9) coming out of the degreasing tank is 40 ° C. or more due to the influence of the degreasing liquid temperature. This is then carried into the washing tank while maintaining this temperature and immersed in a water temperature of 16 ° C. to 22 ° C., so that the internal air of the tubular work (9) is cooled at a stretch to become negative pressure, and the tubular primary cap A phenomenon of sucking air or the like through the slit (4) of the main body (1) occurs. Due to this negative pressure, air and flush water become a pressing force, and the negative pressure of the slide (4) strongly sucks and pulls the lip disc (8), so that the lip pressure sensing valve (13) as shown in FIG. Since it closes tightly close to the tubular primary cap body (1), it prevents intrusion of washing water or the like. As described above, even in a severe environment where the temperature rise and cooling pass through each process and repeated several times, the cap was completely blown away and dropped off. In particular, the process of entering the baking and drying furnace from the water washing tank is the most severe situation because the inside of the drying furnace is set at 180 ° C. to 230 ° C., but has been completely eliminated. Table 1 shows performance comparison verification results of the conventional outer cap and inner cap, and the outer cap and inner cap of the present invention. Moreover, the test situation was performed by attaching a silicon rubber cap to the pipe work 300 in the state of FIG. 7, FIG. 8, FIG. 9, and FIG. However. A conventional cap is attached to one side of both ends of the workpiece.

また、テスト時の前処理およびカチオン電着塗装条件は表２に示す。

Table 2 shows the pretreatment and cationic electrodeposition coating conditions during the test.

    It is sectional drawing of this invention.     It is a top view of the present invention.     It is explanatory drawing of the positive pressure state of this invention.     It is explanatory drawing of the negative pressure state of this invention.     It is sectional drawing of the inner cap type | mold of this invention.     It is a cap assembly drawing of the present invention.     It is test explanatory drawing of the conventional inner cap type | mold.     It is test explanatory drawing of the conventional outer cap type | mold.     It is test explanatory drawing of the inner cap type | mold of this invention.     It is test explanatory drawing of the outer cap type | mold of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tubular primary cap main body 2 Mounting collar 3 Ring convex part 4 Slid 5 Lid-like secondary cap main body 6 Inner latching part 7 Vent hole 8 Lip board 9 Tubular work 10 Primary cap main body insertion side 11 Back side 12 Inner 13 Lip Pressure sensing valve 14 Insertion section 15 Negative pressure 16 Positive pressure

Claims (3)

A fitting collar (2), which is penetrated by a slide (4), is inserted into a tubular primary cap body (1) provided with a ring convex part (3) inside the hollow, which is an insertion part (14) of the tubular work (9). Provided integrally therewith, in addition to the primary cap main body insertion side (10) of the lid-like secondary cap main body (5), an inward latching portion (6) is provided, and also integrated with the back side (11). The air hole (7) and the lip plate (8) are provided, and the lip pressure sensing valve (13) is provided on the inner side (12) of the lip plate (8). A cap with a pressure sensing valve, which is formed by combining a tubular primary cap body (1) and a lid-like secondary cap body (5), which are formed in close contact with each other. 2. Cap with pressure sensing valve according to claim 1, characterized in that the tubular primary cap body (1) is formed in the shape of a plug that is inserted into the tubular workpiece (9). The raw material is formed of natural rubber, styrene butadiene rubber, butadiene rubber, chloroprene rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber silicone rubber, urethane rubber, fluorine rubber, butyl rubber, nitrile rubber or the like. The cap with a pressure sensing valve according to 1.

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