WO2009039711A1 - An inserted closure construction with a threaded pipe - Google Patents

Abstract

An inserted closure construction with a threaded pipe includes a protruding platform (3) at the top of a drum, a threaded pipe (14), a sealing gasket (31) and a plug (29) for the drum. Wherein the top of the protruding platform is extruded by a die and forms an indention portion, and it keeps close to the outer wall of the threaded pipe. The bend edge of the platform keeps close to the inner wall of the upper of the threaded pipe so as to wrap and tighten the pipe permanently. The sealing is appeared between the plug and the pipe due to the sealing gasket. A sealing method and a securing method therefor are disclosed in the invention. In theinvention, the sealing is well and there is no leakage when the deformation of the drum is caused.

Description

 Embedded straight tube spiral ring closure

 The invention relates to a built-in straight tube spiral ring sealer in the field of packaging steel drums. The closing device adopts a concave-convex tooth meshing positioning and a concave table riveting method, so that the straight pipe coil is permanently fixed in the hole of the barrel top boss, and the barrel top boss turning hole serves as a sealing surface to directly contact the sealing gasket and the barrel plug to form a sealing device. . The present invention also provides a method of sealing and securing an embedded straight tube coil closure.

Background technique

 The embedded octagonal coil closure is currently the most widely used steel barrel closure in the world. The G2 sealer is used as a liquid injection port (discharge port) from a 17-liter bucket to a 230-liter container. Use a G3/4 closure as an auxiliary vent. China Steel Bar Closer Standard GB/T 13251-2002, European Standard EN 12928: 2000 and International Standard ISO 15750-3: 2002 provide a detailed introduction and specification of the structure, size and performance of the embedded octagonal coil closure. .

 In order to continuously improve the performance of steel drum seals against impact, drop and leakage prevention, since the invention of the embedded octagonal coil sealer, all countries in the world are working hard. US Patent No. 7,168,585 B2, issued Jan. 30, 2007, discloses a "closer for preventing leakage caused by deformation of a steel drum", which enlarges the top of the bucket and the snail The volume of the seal between the rings, an annular groove is pressed around the top of the bucket, and an annular V-shaped indentation is punched on the octagonal edge of the top of the bucket, consciously weakening the strength of the steel drum. When the steel drum is accidentally impacted and dropped, the annular groove around the top of the bucket and the annular V-shaped indentation with weakened strength on the octagonal edge of the bucket top are first deformed, absorbing a large amount of impact energy, reducing the edge of the boss The closure within the annular V-shaped indentation is affected by the impact deformation. Even if there is a large deformation between the top octagonal boss and the embedded octagonal coil, the larger sealing gasket will use its own follow-up deformation ability to rapidly expand the elastic rubber gasket to fill the newly created gap. Space, to prevent leakage. These patents continue to improve the leak resistance of steel drum sealers.

The embedded octagonal coil closure uses an octagonal flange edge for radial positioning to prevent rotation of the coil when the barrel is tightened. Therefore, the octagonal boss and the boss turn hole should be punched out on the top of the bucket first, then the octagonal flange coil of the sealing rubber gasket is placed in the top octagonal boss of the bucket, and the octagonal coil is pressed by the die. Straight pipe wall rolled outwards, And wrap the top of the bucket top of the bucket. The octagonal coil is permanently positioned in the barrel top boss hole when the octagonal coil flange is radially positioned and the coil is rolled outwardly and longitudinally wrapped. The sealing rubber gasket is filled under the action of the squeeze into the gap between the arc of the boss of the barrel and the octagonal coil to form a sealing barrier belt, preventing the liquid in the barrel from passing through the top of the barrel and the octagonal burr Leakage out of the gap. After the steel drum is filled with liquid, a sealing gasket is required between the embedded octagonal coil and the barrel plug. It can be seen that the embedded octagonal coil closure is a kind of closure that needs to be installed with two sealing gasket structures, and there are two passages for liquid leakage in the barrel. Of course, the steel drum is well sealed under normal conditions and will not leak. However, when the steel drum is impacted and dropped during transportation and loading and unloading, the liquid pressure in the barrel rises instantaneously, and the top of the barrel is deformed, so that the embedded octagonal coil closure is turned over at the top of the bucket top, and is pulled up by the top of the barrel. The gap between the top of the bucket and the octagonal coil is caused to be large or disengaged, so that the sealing gasket loses the sealing effect, causing liquid leakage in the barrel.

 Chinese steel drum sealer standard GB/T 13251-2002, European standard EN 12928:2000 and international standard ISO 15750-3: 2002, and US patent specification US 7, 168, 585 B2 published on January 30, 2007 There are two possible leaking channels in the closure, namely: a) the gap between the barrel plug and the G2 unsealed tube thread; b) the barrel top and the octagonal coil sealing contact surface, once the gap is created, the barrel will Leakage occurs in contact with the atmosphere. At the same time, in the case of a pressure difference between the barrel and the atmosphere, the resulting gap continues to expand. Therefore, a gasket is placed on the barrel plug of all current steel drum sealers to prevent leakage from the gap between the G2 non-sealed pipe threads; at least one contact is provided between the top of the bucket and the octagonal coil (usually 1 ~2) Sealing washers are used to prevent leakage of possible gaps between them.

Summary of the invention

 The object of the present invention is to provide a practical problem of two channels that may leak in the above-mentioned closures which are currently used, and to provide an embedding that does not leak under the condition that the top of the barrel is largely deformed on the basis of the above-mentioned closure. Straight tube coil closures, as well as sealing and fixing methods for such embedded straight tube coil closures.

The object of the present invention is achieved by: a built-in straight tube coil closure comprising a bucket top boss (3), a straight tube coil (14), a barrel plug (29) and a sealing gasket (31), The utility model is characterized in that: the top of the bucket top boss (3) is pressed once to form an arc-shaped toothed meshing combined concave platform (22), and the bucket top boss (3) is in close contact with the outer wall of the straight pipe coil (14). The boss edge (5) is in close contact with the upper edge inner wall of the straight tube coil (14), so that the straight tube coil (14) is permanently fixed in the bucket top boss (3), and the barrel plug (29) is fitted with a sealing gasket ( 31) Rotate the straight tube coil (14) to form a sealing device. In the technical solution according to the invention, the straight tube coil (14) comprises a straight tube (16) and a tube thread (21). In the technical solution of the present invention, the upper and inner walls (17) of the outer wall (15) of the straight tube coil are formed by an annular curved concave-convex tooth formed by pressing the locking die and a bucket top boss of the same portion ( The annular curved concave-convex teeth formed by the inner wall (10) of the 3) and the bottom surface (8) of the boss side (5) constitute an internal meshing state.

 In the technical solution of the present invention, the outer diameter of the concave portion formed by the upper portion of the outer wall of the straight tube coil (15) after being squeezed by the locking mold is larger than the inner diameter of the lower portion of the inner hole (13) of the top of the barrel top, straight The tubular spiral cylindrical recess (19) forms a riveted state with the inner hole (13) of the bucket top boss. ,

 In the technical solution of the present invention, the bucket top boss (3) is a vertically protruding 13 mm high cylindrical boss, and the upper surface of the boss has a boss edge bent into the barrel (5) ), the joint between the top of the bucket (3) and the top of the bucket (1) adopts a circular arc transition.

 In the technical solution of the present invention, the installation distance of the center line of the embedded straight tube coil closure to the top of the barrel is 60-55 mm.

 The invention relates to a sealing method for a built-in straight tube spiral ring sealer, which is characterized in that: a barrel top boss edge (5) which adopts a curved tooth shape is used as a sealing surface, and a sealing gasket (31) and a barrel stopper (29) are passed through The sealing surface contacts form a seal, and the gap formed between the contact sides of the boss edge (5) of the bucket top boss (3) and the straight tube coil (14) can only form a closed passage in the barrel.

 In the sealing method of the present invention, there is no sealing gasket in the contact surface of the barrel top boss (3) and the straight tube coil (14) of the embedded straight tube coil closure.

 The invention relates to a method for fixing a built-in straight tube spiral ring sealer, which is characterized in that: the top plate of the barrel is stamped to form a barrel top convex having a boss edge (5), a process hole (7), and a barrel top boss inner hole (13). Table (3); Place the straight tube coil (14) into the inner hole (13) of the top bracket of the barrel, and insert the top of the straight tube coil (14) into the top of the barrel (3) under the squeeze of the locking mold. The annular groove formed by the boss edge (5) is clamped and radially expanded, and the barrel top boss (3), the straight pipe (16) and the boss edge (5) are locked in the locking die concave and convex tooth positioning sleeve. Under the action, the curved concave and convex tooth meshing combined concave platform (22) is finally formed, and the straight pipe coil (14) is permanently fixed on the top plate of the bucket.

 In the fixing method according to the present invention, the outer diameter (15) of the outer wall (15) of the straight tube coil (14) which is formed by the radial expansion is formed to be larger than the inner diameter of the lower barrel boss (13). the inside diameter of.

 Through the above scheme, the top plate of the barrel is directly sealed by the sealing gasket and the barrel plug; the traditional two seals are changed into one seal; the positioning of the traditional octagonal coil flange is replaced by the concave tooth positioning, and the center line of the closure is barreled The distance between the curls is reduced by 10mm.

BRIEF abstract Figure 1. Overall cross-sectional view of the bucket top boss before assembly. After assembly, the shape of the boss edge 5 will change to the shape of the inversion hole 5.

 Figure 2. is an overall cross-sectional view of the straight tube coil before it is assembled. After assembly, the wall of the straight tube coil is changed into a four-concave mesh-shaped recess.

 Figure 3. is a cross-sectional view of the embedded straight tube coil assembly. It shows on the left side of the section that the embedded straight tube coil combination recess is subjected to the biaxial extrusion clamping portion microstructure, and the right side of the section shows the microstructure after the unidirectional extrusion deformation of the combined concave and convex teeth.

 Figure 4. is a front view of the embedded straight tube spiral assembly.

 Figure 5. is a cross-sectional view of the embossed tooth profile A_A of Figure 4. Make it easy for the viewer to understand the microscopic engagement of the concave and convex teeth! Graphics. Figure 6. is a partial cross-sectional view of the embedded straight tube coil closure under normal conditions.

 Figure 7. is a partial cross-sectional view of the embedded straight tube coil closure when the top cover of the bucket is severely deformed.

 In the figure: 1, the top of the bucket, 2, the outer transition arc, 3, the top of the bucket, 4, the outer convex arc, 5, the boss edge, 7, the process hole, 8, the bottom of the boss, 9, Inner boss arc, 10, inner wall of the boss, 11, inner transition arc, 12, inner wall of the barrel top, 13, inner hole of the boss, 14, straight tube coil, 15, straight tube outer wall, 16, straight Tube, 17, straight inner wall of the coil, 18, micro-arc convex teeth, 19, straight tube screw hole, 20, straight end of the straight tube, 21, G2 non-sealed pipe thread, 22, combined recess, 26, barrel Tip of the plug cover, 28, bottom of the bucket plug, 29, barrel plug, 30, barrel arc, 31, sealing washer, 32, barrel neck, 33, annular groove space, 34, barrel thread, 35 , with clearance, 36, contact gap.

BEST MODE FOR CARRYING OUT THE INVENTION

 BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an overall cross-sectional view of the bucket top boss 3 of the embedded straight tube coil closure prior to assembly. It can be seen from the figure that the bucket top 1 is bent by the inner transition arc 11 and the outer transition arc 2 to form the bucket top boss 3, and the inner diameter of the bucket top boss 3 is 62.7 mm, at the 13 mm edge of the bucket top boss 3. The outer boss arc 4 and the inner boss arc 9 are bent to form a 4 mm wide boss edge 5, and a 56 mm diameter process hole 7 is formed in the middle of the boss. The bucket top boss 3 can be punched by a combined die. Stretching, punching.

2 is an overall cross-sectional view of the embedded straight tube coil 14 before assembly. The straight tube coil 14 comprises a straight tube 16, wherein a G2 non-sealing tube thread 21 is arranged in the lower part of the inner wall 17 of the straight tube coil, and the G2 non-sealing tube thread 21 extends straight to the lower end surface 20 of the straight tube. Before assembly, the straight tube 16 The straight tube spiral outer wall 15 is a smooth surface. Straight tube coil 14 can be in steel drum The packaging requirements are divided into light and heavy specifications. The outer diameter is 62.4 mm for light and the outer diameter is 63.5 mm for heavy duty. The light straight tube coil 14 is composed of a straight tube 16 having an outer diameter of 62.4 mm, a height of 12 mm, and a wall thickness of 1.0 mm, and a G2 non-sealed tube thread 21. It can choose special low-carbon straight seam electric welded steel pipe to be processed by cutting without cutting, squeezing, punching, tapping G2 unsealed pipe thread, trimming and galvanizing the surface.

 3 is a cross-sectional view of the embedded straight tube coil assembly of the present invention. When the straight tube coil 14 is placed in the boss inner hole 13 at the top of the bucket, under the squeeze of the lock mold, the bucket top boss edge 5 is bent downward from the inner boss arc 9 to enter the straight tube coil hole 19 Inside, gradually enclosing the inner wall 17 of the straight tube coil, the annular groove formed by the inner wall 10 of the boss top of the bucket top boss 3 and the bottom surface 8 of the boss base clamps the straight tube 16 in the annular groove, and the boss side 5 is locked Under the action of the die, it becomes a boss turning hole. At the same time, the bucket top boss 3, the straight pipe 16 and the boss turn hole initially form a combined recess. The outer diameter of the concave portion formed by the upper portion of the outer wall 15 of the straight tube coil after being squeezed by the locking mold is larger than the inner diameter of the lower portion of the inner hole 13 of the top of the barrel top, and the surface between the barrel top boss 3 and the straight tube coil 14 is combined. No gaskets are installed.

 Figure 4 is a front elevational view of the embedded straight tube coil assembly. The upper portion of the bucket top boss 3 has an annular boss, and the outer wall of the bucket top boss 3 has eight microscopic curved teeth 18.

Figure 5 is a cross-sectional view taken along line A-A of the curved convex tooth of Figure 4. It is mainly convenient to understand the process of forming the embossed teeth. When the outer core of the bucket top boss 3 is expanded to the embossed tooth positioning sleeve of the locking mold, the convex tooth surface is positioned. The barrel top boss 3, the straight tube 16 and the boss side 5 are subjected to bidirectional extrusion from the core and the convex tooth surface, and enter the plastic deformation pressing process. The extruded material begins to move into the concave tooth cavity on both sides of the convex tooth surface. At this time, the combined concave table 22 at the concave tooth cavity portion rapidly protrudes into the concave tooth cavity under the unidirectional pressing force of the core and the material movement on both sides of the convex tooth surface, and produces plastic permanent deformation, so that the bucket top boss 3. The straight pipe 16 and the boss edge 5 generate different degrees of arcuate protrusions in the assembly of the combined recess 22, and the boss edge 5 is bi-directionally pressed on the convex tooth surface, and the material moves toward the concave tooth cavity to make the concave tooth The material of the boss portion 5 of the cavity portion is thickened, and the bottom surface 8 of the boss portion of the boss portion 5 forms an arc-shaped protrusion. The straight pipe 16 is bi-directionally pressed on the convex tooth surface, and the material also moves toward the concave tooth cavity, so that the concave tooth The thickness of the straight tube 16 in the cavity is increased, and is convex toward the concave tooth cavity along the bottom surface 8 of the boss side 5, and the bucket top boss 3 is bi-directionally pressed on the convex tooth surface, and the material is also moved to the concave tooth cavity. The thickness of the bucket top boss 3 in the concave cavity is increased, and at the same time, the arc of the outer wall 15 of the straight pipe 16 is convex toward the concave tooth cavity. At this time, the concave teeth of the inner wall 17 of the straight pipe 16 in the concave tooth cavity are in arc-shaped engagement with the convex teeth of the boss bottom surface 8 of the boss side 5. The convex teeth of the outer wall 15 of the straight pipe 16 and the concave teeth of the inner wall 10 of the boss of the bucket top boss 3 also form an arcuate engagement. When the lock-and-fit combination die is finished, a concave-toothed arc-shaped mesh with a depth of 4 mm is finally formed. The recessed table 22 is combined. Although the arc-shaped toothed engagement height formed by the straight pipe 16 and the bucket top boss 3 is only 0.25 to 0.5 mm, the contact pressure between them and the screwing force of the barrel plug are sufficient to prevent the diameter of the straight pipe coil 14 from being generated. When rotating, the combined concave table is radially enlarged, so that the outer diameter of the upper portion of the straight pipe 16 is larger than the inner diameter of the lower portion of the inner hole 13 of the top of the barrel, and the cylindrical concave groove of the straight tube is riveted in a bell mouth so that it cannot be axially Moving, the straight tube coil 14 is permanently fixed in the inner hole 13 of the bucket top boss.

 Figure 6 is a partial cross-sectional view of the assembled straight tube coil closure of the present invention after assembly. The bucket top boss 3 utilizes the riveting positioning function of the combined recess 22 to transfer its structural strength and the thread clamping function of the straight tube coil 14 to the bucket top boss 5 so that the bucket top boss 5 is sufficient to withstand 150N · m (G2 barrel plug) The contact pressing force generated by the rotational torque and used as a contact surface. When the barrel stopper 29 with the sealing gasket 31 is screwed into the embedded straight tube coil 14, the sealing gasket 31 directly contacts the barrel top outer boss arc 4 and the boss edge 5, when the barrel stopper 29 is screwed to the barrel stopper When the corner angle 26 is in contact with the outer arc 4 of the bucket top, the barrel stopper 29 is positioned to stop falling. The sealing gasket 31 is formed by the rebounding force generated by the compression at the top of the bucket boss 5, the tip angle 26 of the bucket cover, the bottom surface 28 of the bucket, the arc of the barrel 30, the barrel neck 32 and the straight tube coil 14. A rubber elastomer sealing band is formed in the annular groove space .33 to prevent liquid leakage in the barrel. Because the embedded straight tube coil closure adopts the embossed tooth meshing positioning instead of the octagonal flange edge positioning, the overall size of the embedded straight tube coil closure is reduced to 68 mm, and the installation distance between the center line of the closure and the top of the barrel is reached. 60~55 mm. When the steel drum is turned 180 degrees and the residual liquid is poured, the top of the bucket is between 0 and 20 degrees from the surface of the ground. The sealer is at the lowest position, and the volume of the residual liquid in the barrel can be reduced to less than 50 ml.

 Figure 7 is a partial cross-sectional view of the embedded straight tube coil closure at the top of the barrel. When the steel drum is accidentally impacted and dropped during transportation or loading and unloading, the liquid pressure in the barrel rises instantaneously, forming a liquid impact. Since the flat thin wall structure of the top of the barrel has the worst rigidity, the deformation is first caused, and the top of the barrel is severely bulged outward. The tensile stress generated by the deformation of the top 1 causes the transition arc 11 in the boss around the embedded straight tube coil closure to quickly pick up, so that the bottom of the straight tube coil 14 protrudes into the cylindrical boss hole. Since the sealing gasket is not installed between the straight tube coil 14 and the transition arc 11 in the surrounding boss, it is not sealed by itself, so even if the straight tube coil 14 protrudes from the cylindrical boss hole of the barrel, no leakage accident occurs. .

When the top tensile stress of the bucket picks up the outer transition arc 2, the cylindrical outer wall of the vertical bucket top boss 3 is encountered. Since the cylindrical outer wall generates a large cold working stress during the drawing and drawing, the tensile strength of the cylindrical outer wall is very high. Big. The straight tube coil 14 with strong inner lining of the inner wall of the boss 10 makes the rigidity of the bucket top boss 3 several times larger than the rigidity of the barrel body, and the deformation stress of the top of the barrel encounters the cylindrical outer wall of the embedded straight tube coil closure. Can only change direction along the cylindrical boss, spread to the surrounding Disappeared. A part of the liquid enters the inner wall 8 of the barrel top cover boss 5 and the straight tube spiral recess wall 17 along the contact gap 36 of the bucket top boss inner wall 10 and the straight tube coil outer wall 15 under the pressure of the barrel. Finally, the annular groove space 33 is finally reached, which becomes the only channel that may be generated due to the deformation caused by the top tensile stress of the barrel, which is formed by the boss side 5 and the bottom surface 28 of the barrel cover, the barrel neck 32 and the straight tube coil 14. The annular groove is a fixed space 33, and the sealing band formed by the sealing gasket 31 under the pressure of the barrel is sufficient to prevent liquid leakage under normal conditions. When the pressure in the barrel rises instantaneously, the sealing gasket 31 can move in the direction of the force under the pressure of the liquid in the barrel, so that the contact pressure on the sealing surface rises rapidly, so the contact pressure on the sealing surface is greater than the pressure in the barrel. The process of changing the contact state of the sealing ring by the pressure of the liquid in the barrel to seal it is a self-sealing action of the sealing ring in the fixed space. The other part of the liquid enters the annular groove space 33 under the pressure of the barrel along the fitting gap 35 of the straight tube coil tube thread 21 and the barrel tube thread 34. Their state is the same as the above case, and the straight tube snail cannot be embedded. The ring sealer leaked out.

 It can be seen from the above drawings that the sealing method of the present invention is: contacting the sealing top surface 5 with the concave-tooth tooth meshing shape as a sealing surface, and directly forming a sealing device with the sealing surface of the barrel stopper 29, the barrel Once the barrel top boss 5 of the top boss 3 is engaged with the straight tube coil 14, a gap is formed between the contact faces thereof, and the gap can only be returned to the barrel under the action of the sealing device. Therefore, in the embedded straight tube coil closure of the present invention, it is not necessary to provide a sealing gasket when the contact faces of the bucket top boss 3 and the straight tube coil 14 are permanently fixed.

 The fixing method for realizing the embedded straight tube coil closure is: inserting the straight tube coil 14 into the inner hole 13 of the barrel top boss, and embedding the top of the straight tube coil 14 into the barrel top boss under the squeeze of the locking mold 3 is clamped in the annular groove formed by the boss edge 5 and radially expanded, and the bucket top boss 3, the straight pipe 16 and the boss edge 5 are finally formed into bumps under the action of the locking tooth locating sleeve of the locking die. The teeth are combined to form a recess 22 . The barrel top boss 3 and the straight tube 16 are in a state of convex tooth engagement, so that the straight tube coil 14 cannot be rotated radially, and the straight tube spiral cylindrical recess 22 is in a bellowed state, so that the straight tube coil cannot move axially. Thus, the straight tube coil 14 will be permanently fixed to the top cover of the bucket.

 Industrial applicability

 The embedded straight tube coil closure adopts the bucket top boss edge 5 as a sealing surface, and directly contacts the sealing gasket 31 and the barrel stopper 29 to form a sealing device. When the steel drum is subjected to impact, drop, and severe deformation of the top of the bucket during transportation and loading and unloading, when the bucket top boss 3 is combined with the straight pipe coil 14, the contact surface is closed loop with the inside of the bucket, and is not installed. The sealing gasket does not cause a leakage accident even if the straight pipe coil 14 and the bucket top boss 3 generate a large gap.

The embedded straight tube spiral ring sealer and the bucket top boss adopt concave and convex tooth meshing and concave table riveting positioning to cancel the octagonal snail The flange side of the ring reduces the overall size of the straight tube coil seal to 68 mm, and the installation distance between the center line of the sealer and the top of the barrel can reach 60-55 mm. When the steel drum is turned 180 degrees, the residual liquid is poured. When the top cover of the bucket is between 0 and 20 degrees from the ground plane, the sealer is at the lowest position, and the volume of the residual liquid in the bucket can be reduced to less than 50 ml.

 The embedded straight tube spiral ring sealer uses low-carbon straight seam electric welded steel pipe to pass through no cutting and cutting. The corner scrap produced during the manufacturing process is very small, which can save half of the steel compared with the traditional octagonal flanged coil manufacturing process.

Claims

Rights request  1. A built-in straight tube coil closure comprising a bucket top boss (3), a straight tube coil (14), a barrel plug (29) and a sealing gasket (31), characterized in that: the barrel top convex The top of the table (3) is formed by pressing once to form a curved tooth-shaped engaging concave table (22), and the top boss (3) of the bucket is closely attached to the outer wall of the straight pipe coil (14), and the boss edge (5) is tight. Attached to the upper edge of the straight tube coil (14), the straight tube coil (14) is permanently fixed in the bucket top boss (3), and the barrel plug (29) is fitted with a sealing washer (31) and then screwed to the straight tube. The coil (14) forms a sealing device.  2. The embedded straight tube coil closure of claim 1 wherein: said straight tube coil (14) comprises a straight tube (16) and a tube thread (21).  3. The embedded straight tube coil closure according to claim 1, wherein: the upper part of the outer wall (15) of the straight tube coil and the inner wall (17) are formed by pressing the locking die The annular curved concave teeth form an inner meshing state with the annular curved concave teeth formed by the inner wall (10) of the bucket top boss (3) and the bottom surface (8) of the boss side (5).  4. The embedded straight tube coil closure according to claim 1, wherein: the outer portion of the outer wall of the straight tube coil (15) is formed by pressing the locking die to form an outer diameter of the concave table larger than the barrel. The lower inner diameter of the inner hole (13) of the top boss, the cylindrical recessed boss (19) of the straight pipe and the inner hole (13) of the top of the bucket form a riveted state.  5. The embedded straight tube coil closure according to claim 1, wherein: the bucket top boss (3) is a vertically projecting 13 mm high cylindrical boss on the boss The surface has a boss edge (5) bent into the barrel, and the joint between the bucket top boss (3) and the bucket top (1) adopts a circular arc transition.  6. The embedded straight tube coil closure according to claim 1, wherein: the embedded straight tube coil closure center line is installed at a distance of 60 to 55 mm from the top of the barrel.  7. A method for sealing a built-in straight tube coil closure, characterized in that: a barrel-shaped boss edge (5) that engages in a curved tooth shape is used as a sealing surface, through a sealing gasket (31) and a barrel stopper ( 29) The sealing surface contacts form a seal, and the gap between the contact surface of the boss top (5) of the bucket top boss (3) and the straight tube coil (14) can only form a closed channel in the barrel. .  8. The method for sealing a built-in straight tube coil closure according to claim 7, wherein: the barrel top boss (3) and the straight tube coil (14) of the embedded straight tube coil closure There is no sealing gasket in the contact surface.  9. A method for fixing a built-in straight tube coil closure, characterized in that: the barrel top plate is stamped to form a barrel containing a boss edge (5), a process hole (7), and a barrel top boss inner hole (13) The top boss (3); put the straight tube coil (14) into the inner hole (13) of the top bracket of the bucket, and insert the top of the straight tube coil (14) into the top of the bucket under the squeeze of the locking mold (3) After being clamped in the annular groove formed by the boss edge (5), the radial expansion is generated, and at the same time, the bucket top boss (3), straight The tube (16) and the boss edge (5) are finally formed into a curved concave-concave tooth meshing combined recessed table (22) under the action of the locking tooth locating sleeve, and the straight tube coil (14) is permanently fixed in the barrel. On the top plate.  10 . The method for fixing a built-in straight tube coil closure according to claim 9 , wherein: the outer wall of the straight tube coil ( 14 ) with the curved concave and convex teeth meshing shape formed after the radial expansion is generated. (15) The upper outer diameter is larger than the inner diameter of the inner hole (13) of the lower bucket top boss.