JPS5820381A - Watertight gun for underwater stud welding - Google Patents

Abstract

PURPOSE:To obtain a watertight gun for underwater stud welding free from leakage of compressed gas by housing the body of a welding gun in a watertight housing and elastically sealing the bearing of an operation shaft. CONSTITUTION:The body of a gun for stud welding that uses a ferrule is enclosed airtightly by a watertight housing 2 provided with a cylindrical part 6 enclosing a stud 15. An operation shaft 3 to which a ferrule holding part 6 and a stud chuck 23 are attached is installed in the cylindrical part 6, and allowed to go in and out by arc length. An elastically sealed part 4 is provided in the bearing 30 of the gun body side of the operation shaft 3. Compressed air is sent from an air supply pipe 29 to inside of the housing 2 and the cylindrical part of the housing. The elastic seal 4 has non-return sealing action, and when internal pressure of the housing 2 is made higher than surrounding water pressure, compressed gas leaks out from the sealed part 4 in a quantity suitable for lubrication. By this way, inside and outside of the housing 2 are kept at very small differential pressure. Interference to the operation shaft is eliminated and welding quality is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a waterproof underwater stud welding gun, and aims to improve and generalize the invention of the same name disclosed in Japanese Patent Application Laid-open No. 55-53877, which was previously developed by one of the inventors of the present invention. . Its main features are that the main body of the gun for normal stud welding, which uses a ferrule, is housed in a waterproof nozzle, and that an elastic seal is provided on the bearing on the gun body side of the compressed air inside the housing. If the internal pressure of the elastic seal sFi housing exceeds the external pressure, compressed gas will leak out, and by constantly balancing the internal pressure of the housing with the external pressure, the effect of the force difference between the inside and outside is affected by the movement of the operating shaft in and out. In addition, gas is leaked from the seal part to facilitate sliding of the operating shaft sliding part, and furthermore, K11m1! It is better to prevent II spatter from flying into and adhering to the sliding part of the operating shaft.

In addition, as a second invention, in order to wipe away and dry the moisture on the stud tip and the surface of the base material, the compressed gas in the ferrule holding part is injected at high pressure from the open area between the stud and the ferrule. This is from KLI.

The above-mentioned invention of Special Patent No. 55-55877 removes moisture from the welded part in the shortest time l[K in underwater stud welding.
Compressed gas is sent into the outer tube that surrounds the outer circumference of the stud, and at the same time, the compressed gas eliminates water in the outer cylinder, and at the same time, it is ejected from the gap between the stud and ferrule to wipe away moisture from the stud tip and the base metal surface. This is the first basic invention to solve the problem using a method.

However, there were the following problems in aggregation.

In other words, the problem of making the gun body itself water-resistant can be solved by resin impregnation, but by attaching a stud, moisture and impurities can get into the sliding parts of the operating shaft and bearing that move in and out of the gun body, preventing insulation. There were still moments in practice where breakage occurred or welding spatter became stubborn and obstructed the movement in and out.

In addition, even if the compressed gas sent to eliminate the water in the outer cylinder is ejected from the opening WltP between the stud and the ferrule, the ferrule retaining S is usually made with two vertical grooves to ensure retention. Since the four pieces are cut to provide a spring action, they can escape from the weld and cause weld defects due to insufficient KH removal of moisture from the weld.

As mentioned above, the waterproof housing of the gun body and the elastic seal IIK of the operating shaft bearing eliminate the first problem and prevent high-pressure gas from escaping into the gap between the stud and the 7-way rule. It was nine days after I sent it.

Next, the configuration and solid line embodiment of the present invention will be explained with reference to the drawings.

Fig. 1 is a cross-sectional view of the invention vs. the embodiment. When the main component is opened, the main body of a gun for stud welding using 7 errules is shown, the main body is airtightly wrapped, and the front section is A waterproof housing with 1111s4 surrounding the stud lj, a ferrule holding s10 provided in the s4, a stud gripping fitting 3 attached to the tip, an operating shaft J that moves in and out of the gun body l by an arc length, and this operation These include an elastic seal st provided with a bearing JOfC on the gun body side of the shaft J, an air supply pipe for sending compressed air into the inside of the housing, and the cylindrical portion of the housing.

Since the gun body is housed in a waterproof housing, it can be used with those normally used on land. In this case, the ferrule is held in the large cylinder S4 attached to the front of the housing.
The intermediate wall 3/ having a diameter 110 is divided into front and rear parts, and communicates through a through hole J (see Fig. 5). The rear part of the cylindrical part t is hard like the housing, but the front slub that contacts the base material MK is made of a breathable material, such as steel wool or sponge made into a cylindrical shape.
It works by dividing the gas pushed into the water into small bubbles. If you make large bubbles and put them out, water will seep in the moment they come out, so make them into small bubbles.

As shown in Fig. 2, since the upper stage of the ferrule L is stepped, the inner cylinder with the vertical slit of the ferrule holding s10 is held in the upper stage of the ferrule L, and the outer cylinder without vertical slits is placed in the lower stage of the ferrule. By setting Da, escape of the compressed gas was prevented. That is, ferrule retention
10 is attached to the center hole of the intermediate wall 31, and in this embodiment, the outer fIIJl has a collar attached to both sides of the intermediate wall 31.
oα and an elastic clamping body (lill) with a collar attached to the rear surface.
A vertical slit is cut in the inner part to form a double-layered ferrule support part, and as shown in Fig. 2, a clamping body with the upper center of the ferrule is used as shown in Figure 2. Scissors, outside of the lower part of the ferrule without a vertical slit @ ioa
The ends are tucked in. A compressed gas introduction path l provided in the intermediate wall J is connected to the ferrule holding s10, and receives compressed gas that is not depressurized from the air supply pipe through the branch pipe core and valve (cock) 7. As mentioned above, the high-pressure gas is ejected from the stud lj1 ferrule/4I connection lItP to blow away the moisture in the welded area and then dry it. The compressed gas is preferably a dry gas, and may be air, carbon dioxide gas, or argon gas.

The operating shaft 3 that moves in and out of the gun body 1 is similar to the known one. This tip of KFi's well-known stud fitting 23 is fitted, and KIF! ! Current is sent and is being energized,
It is pulled back into the gun body l by the magnetic force by the shear arc length, and returned by the spring when the current is turned off. At that time, it is also well known that the 1nis of the stud end and the base metal surface are crimped together.
Gun body L side bearing 3 that prevents lateral vibration of this operating wheel J
As shown in FIG. 4, the elastic seal 11 of this embodiment is commonly called a lip seal tei, which is fixed with a retaining ring.

As is well known, when the external pressure is high, the lip seal is pressed against the shaft 3 to strengthen the sealing action, and when the internal pressure is high, the sealing action is weakened, allowing the gas inside the housing to leak.

There is a needle adjustment valve between the air pipe and the housing.
intervene to appropriately reduce the original pressure above the water and send the water. Adjustment valve j 01lliillt! This is done by an underwater worker, and if the pressure inside the housing is lower than the water pressure, there will be no gas leaking from the elastic seal S. If it is higher, leakage will occur and bubbles will be produced.

In the example shown in FIG. 1, the water in the tank s6 is removed by the leaked gas, and no special gas intake port for water removal is provided.゛Cylinder with ferrule holding part 10 attached 114, middle transparent 31 and 3-J
J, #, JJ@ appear, respectively, support gel)/J is the base material M
K[i is facing directly. The protrusion length of each bolt/3 can be adjusted with a nut.

Next, a supplementary explanation of the details and the operation of this embodiment will be given. Figure 1 shows the state before the base metal MK gun is pressed down, but the gripping metal fittings, 27iC9i stud bolts/! is the ferrule holding m10KFi/4I], ya-
It's out in front. Adjust the protruding length of the tripod bolt 13 to suit your needs, and then hold the Ilp section of the gun housing 2 and press the tip of the stud/j against the base material M. The stud l! In addition, Kin Ako 3 compresses the spring inside the main body l and moves back a little,
It is electrically connected to the base material M.

RKIll! The adjusted regulating valve jKX is elastic and the elastic seal fills the ring with leaked gas and expels water.

In the first @ sideways position, water is pushed out through the breathable hole 1111111tlll#:fi- through the hole opened at the bottom 11 of the intermediate wall 31, and then the pushed out leakage gas forms bubbles and comes out. In the case of the downward position, blind plugs are provided in the hole at the bottom of l1ls6 and the hole l at the bottom of the intermediate wall 31, so most of the water comes out through 111111#IIIz+.

In addition, in the case of the upward position, since only the intermediate wall J/lower hole/JK is blind plugged, it comes out through the lower hole ll of @s4 and the front s16 of the cylindrical part. Unlike the basic invention described above, in this invention, the removal of water within the area IB≦ and the blowing off and drying of the moisture near the welded part are different.

Therefore, the flow rate (flow rate) of gas leakage from seal 54I-
It is sufficient if the amount is small enough to prevent the backflow of water before AM S14.

As a guideline, it is sufficient that Qi/1K comes out without interruption from either the hole l in the butterfly intermediate wall j/'Fill or the hole /i on the lower side of the fim part 1.

Just before welding starts, turn cock 7 on the air supply branch pipe core to 15 for a short time.
Seconds later, it opens and the compressed gas at the original pressure is directly introduced into the ferrule holding part io through the intermediate wall J/internal gas introduction path It. The high-pressure gas advances along the stud lj outside the ferrule holding part @)ton and blows out from the 7-work rule lI interval II>, blowing off the moisture remaining on the stud /j*, the end, and the base material M11 surface. Dry together.

In this case, if there is only an inner cylinder that holds the upper part of the ferrule O, there is a vertical slit in this inner cylinder, so the compressed gas escapes from the ferrule and the stud. In order to prevent this and concentrate the entire amount of compressed air to the 7 ferrules and the gap between the studs and ensure a refreshing blow drying effect, place the bottom of the ferrule in your mouth III! It is provided with an outside without a slit. This compressed air exits into the prelimbum @/1 and then exits into the water outside.

When the start switch /j, which has a tree-proof structure, is made conductive,
Housing JK waterproof connector - welding current cord connected via heco λ 0. By control current cord l], stud l! , a short circuit current initially flows between the base metal M, and for a certain period of time, the stud l! Pull up to generate an arc, then use the spring to attach the stud! Stud welding is completed using a well-known mechanism that crimps the material onto the base material's melted surface.

In addition, in this example, since the valve 7 of the branch pipe 27 is used as a cock, the gas i of the compressed gas to be injected is adjusted by the original pressure, and is approximately 7 (−, the surface after water is removed. Dry moisture.

The adjustment of the tripod (Pol)/J is a well-known technique, so I omitted the explanation, but ll! is a stud l! The support legs should be placed so that they stand perpendicular to the base material MK, and any support legs may be used.

The method of fixing the gun body/housing to the housing is left to the designer, but as shown in Figure 1, the main body! Airtight seal (O ring) 2 on front 11! Tighten the front part of the removal jack with a screw with a sealing pad (not shown). Drain hole/
/It is also a good idea to use a valve (cock) on the saw that can be opened and closed.

In addition, the eleven aspects of the present invention are well known to the designer and can be varied and applied in various ways without changing the gist of the invention.

In this 1jiFi underwater stud welding gun, the gun body is housed in a waterproof housing, so that the land gun body can be used as is. A great effect was produced by providing an elastic seal portion that acts as a non-return seal on the operating shaft that protrudes from the main body or housing to the outside. In other words, if the internal pressure of the housing is low (like the water pressure), stop the water from entering, and if the internal pressure is raised by the regulating valve or the external pressure, the seal will act as a safety valve to maintain a minute pressure difference between the inside and outside of the housing, and the operating shaft will operate due to the pressure difference between the inside and outside. This means that the gas leaking outward from the elastic seal stP reduces the friction between the bearing sliding surface and the operating shaft, and the leaking airflow from the elastic seal prevents the adhesion of the molten II nupatta. It is something that can be prevented. There is no need for a troublesome automatic adjustment mechanism to adjust the regulating valve that sends compressed gas to the housing according to the water depth, and the operator can easily adjust it by hand according to the level of air bubbles leaking from the seal.

In the second invention, there is an opening between the ferrule and the stud.
The high-pressure compressed gas ejected from the ferrule is directly introduced into the ferrule support tube, creating a strong moisture removal effect.During the injection, the ferrule hits the base material, so there is a risk of it being blown away. .

In this way, we were able to make the operation easier, increase the equilibrium force during crimping, and completely remove moisture from the weld.We conducted an underwater test of the above-mentioned refreshing example gun by polishing and corroding the cross section of the weld. Tohiro achieved excellent results, similar to those obtained on land.

This invention proves the superiority of the principle of the above-mentioned basic invention, improves its durability and welding quality, and enables a wide range of inexperienced underwater workers to refresh their skills in underwater welding, resulting in great technical effects. is big.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view of an example of the present invention, FIG. 2 is an enlarged cross-sectional view of its tip, FIG. 5 is a bottom view thereof, and FIG. 4 is an explanatory cross-sectional view of the vicinity of the elastic seal portion. /-...Gun body, Co...Waterproof housing, J-...
Operating shaft, ri...elastic seal part, λ79.2 li...air pipe, 10...ferrule support part. Figure 3 Procedural amendment (voluntary) August 25, 1980 Haruki Shimada, Commissioner of the Patent Office 1 Indication of the case % Resin No. 118494/1983 2 Title of the invention Waterproof underwater stud welding gun 5 Amendment pipe case Relationship with Applicant 1-5-1 Enokigaseki, Chiyoda-ku, Tokyo 2-3-5 Hananomiya-cho, Takamatsu-shi, Kagawa Prefecture Director of Shikoku Industrial Technology Laboratory, Agency of Industrial Science and Technology 5g1 Agent Contents L Invention In the detailed explanation, (1) page 9, line 11, “ana ni” was corrected to “ana l ko”, (2)
1G page 9 line 9 r ts seconds” was corrected to “3 seconds”, (3) 10
Page 15, line 15, “Rule/j J is corrected as “rule team”, (4) Page 12, line 5 r@I, J is corrected as “4th”, (5)
After ``tsukin'' on page 12, line 5, join the rJkJ association and read ``(1
omitted) J1krj Hiroshi” and corrected, Figure 1 of the drawing, code “6”
Add a leader line as shown in the attached drawing S. that's all

Claims (2)

[Claims] (1) A stud welding gun body that uses a ferrule, a waterproof housing that airtightly encloses this body and has a light-proof housing that surrounds the stud at the front, a ferrule holding part provided inside the housing, and a stud gripper. An operating shaft with a metal fitting attached to the tip and an operating shaft that moves in and out of the gun body by the length of the gun, an elastic seal section on the gun body side of the operating shaft, and a supply for sending compressed gas into the housing and the housing. A waterproof layer for underwater stud welding characterized by having a trachea and increasing the internal pressure of the housing above the surrounding water pressure so that compressed gas leaks from the elastic seal part at a flow rate suitable for anti-friction action. gun. (2) A gun body for stud welding that uses a feather gun, a waterproof housing that airtightly encloses this body and has a cylindrical part surrounding the stud in the front part, and the housing 1i1 mentioned above.
A ferrule holding part provided at 111, an operating shaft with a stud gripping fitting attached at the tip, which moves in and out of the gun body by an arc length, an elastic seal part provided on the gun body side of the operating shaft that loosens due to internal pressure, and the above. Inside the housing, tas
and an air vent for sending compressed gas into the 7-work rule holding section, and the compressed gas at high pressure sent to the 7-work rule holding section escapes to the other side via the 7-work rule support circle. This is a waterproof underwater stud welding tube which has a mechanism in which the entire amount of water is ejected from the ferrule and the gap between the studs, and which dries the moisture on the stud tip and the base metal surface.