Quickly disassembled small-diameter deep-hole pipeline butt welding inner support tool and method

Abstract

The application is a kind of small diameter deep hole pipeline butt welding inner support tool and method which is characterized by including an inner support mechanism (40) and a dismounting handle (50); the dismounting handle (50) is connected to the upper part of the inner support mechanism (40); the inner support mechanism (40) further includes a lower base (1), an upper cover plate (2), an inner support block (3), a compression spring (4), a top column (5), a connecting screw (6), an inner hexagonal taper bolt (8) and a C-shaped quick plug male head (7); the application has simple structure and is convenient to use, and solves the defects of low welding precision and unguaranteed welding quality of the existing deep pipe welding. The application uses welding inner support to assist welding, guarantees the assembly precision during the welding of deep hole thin-walled pipe, and can quickly assemble and disassemble inside the deep hole pipe before and after welding.

Description

Technical Field

[0001] This invention relates to a welding internal support fixture, and more particularly to a quick-assembly and disassembly internal support fixture and method suitable for 16-way butt welding of small-diameter deep-hole pipes. Background Technology

[0002] A key component of nuclear reactor equipment consists of two small-diameter, deep-hole pipes welded together, with a 0.3 + 0.3 mm butt joint. Corrosive media flow through these pipes, making the weld quality crucial for the operation of the nuclear equipment. Laser autofusion welding is used for this weld. Laser welding demands high assembly precision from structural components; gaps and misalignments are not permissible at the welding location. Therefore, a welding internal support fixture is needed to ensure assembly precision during the welding of the deep-hole thin-walled pipes, and a process method that allows for rapid assembly and disassembly within the deep-hole pipes before and after welding. Summary of the Invention

[0003] The purpose of this invention is to provide a quick-assembly and disassembly method for welding internal supports for small-diameter deep-hole pipes, ensuring accurate assembly during deep-hole pipe welding and allowing for quick assembly and disassembly inside the deep-hole pipe before and after welding.

[0004] A quick-assembly and disassembly tooling for welding small-diameter deep-hole pipes, characterized in that it includes an inner support mechanism 40 and a disassembly / assembly handle 50; the disassembly / assembly handle 50 is connected to the upper part of the inner support mechanism 40.

[0005] The internal support mechanism 40 includes a lower base 1, an upper cover plate 2, an internal support block 3, a compression spring 4, a top column 5, a connecting screw 6, an internal hexagonal tapered bolt 8, and a C-type quick-connect male connector 7;

[0006] The lower base 1 is a metal cylinder with an outer diameter slightly smaller than the inner diameter of the deep hole tube 60 to be welded. A cylindrical groove 11 is machined in the center of the lower base 1. Multiple annular grooves 14 are evenly distributed along the outer edge of the upper surface of the lower base 1. Multiple straight grooves 12 are machined on the upper surface of the lower base 1 along the line connecting the central axis of the upper surface and the midpoint of the annular groove 14. A thin sidewall 15 is left between the straight groove 12 and the annular groove 14. A semi-circular hole 13 is machined on the thin sidewall 15. Threaded holes 16 are evenly distributed on the upper surface of the lower base 1 along the center line of the included angle between every two straight grooves 12. A bolt through hole 17 is machined at the center of the bottom of the cylindrical groove 11 of the lower base 1. An internal thread 171 is provided at the upper part of the bolt through hole.

[0007] The upper cover plate 2 is a metal disc with the same diameter as the lower base 1; corresponding annular grooves 22 and straight grooves 23 are machined on the lower surface of the upper cover plate 2 at positions symmetrical to the lower base 1; thin sidewalls 25 and semi-circular holes 27 are provided on the upper cover plate 2 and the lower base 1 at corresponding positions; a through hole 24 slightly smaller than the head diameter of the internal hexagonal tapered bolt 8 is machined at the center of the upper surface of the upper cover plate 2; countersunk through holes 21 are machined on the upper surface of the upper cover plate 2 at positions corresponding to the threaded holes 16 of the lower base 1;

[0008] The inner support block 3 is a metal block with the same shape as the annular groove 14 on the upper surface of the lower base 1. Its height is the sum of the depths of the annular groove 22 on the upper cover plate 2 and the annular groove 14 on the base of the lower base 1. An inner support block threaded hole 31 is machined at the center of the inner surface of the inner support block 3, and an inner support block groove 32 is machined horizontally at the center of the outer surface of the inner support block 3.

[0009] The top post 5 is a metal rod with the same diameter as the semi-circular hole 13 of the base, one end is threaded, and the other end is a metal ball 501 with a diameter larger than that of the compression spring 4; the compression spring 4 is slightly larger than the diameter of the top post 5, and the compression spring 4 is sleeved on the top post 5; the threaded end of the top post 5 passes through the semi-circular hole 13 of the base and is installed on the straight groove 12, and the compression spring 4 abuts against the thin sidewall 15 on the side of the straight groove 12; the inner support block 3 is embedded in the annular groove 14 on the upper surface, and the inner support block 3 is connected to the top post 5 by threads;

[0010] The upper cover plate 2 is mounted on the lower base 1 by connecting screws 6;

[0011] The C-type quick-connect male connector 7 is a metal tube with an inner diameter slightly larger than the diameter of the through hole 24 of the cover plate. The C-type quick-connect male connector 7 is coaxially welded to the upper surface of the upper cover plate 2. Multiple hemispherical grooves 71 are evenly distributed in the circumferential direction in the middle of the outer side wall of the C-type quick-connect male connector 7.

[0012] The internal hexagonal tapered bolt 8 is passed through the C-type quick-connect male connector 7 and the cover plate through hole 24 of the upper cover plate 2 and connected to the internal thread 171 on the bolt through hole 17 of the lower base 1.

[0013] The disassembly and assembly handle 50 includes a straight handle 59, a C-type quick-connect female connector 10, a transmission sleeve 51, a hexagonal screw 53, and a spring ball plunger 52;

[0014] The straight handle 59 of the disassembly and assembly handle 50 is a straight metal tube with an outer diameter larger than the outer diameter of the C-type quick-connect female 10 and an inner diameter smaller than the inner diameter of the C-type quick-connect female 10. The outer diameter of the lower end of the straight handle 59 decreases, and the reduced outer diameter is matched with the C-type quick-connect female 10 to be machined with a threaded post 592. Multiple threaded holes 591 are machined circumferentially on the side wall of the straight handle 59 near the lower end at the same height position, with the number of holes preferably being 2 to 4.

[0015] The C-type quick-connect female connector 10 is connected to the lower end of the straight handle 59 by a thread; the collar 57 is fitted onto the lower part of the C-type quick-connect female connector 10 by a spring sleeve 102 to achieve vertical sliding at the lower part of the C-type quick-connect female connector 10.

[0016] The transmission sleeve 51 is a metal tube with a stepped hole at the bottom. Its inner diameter is slightly larger than the maximum outer diameter of the straight handle 59. The inner diameter of the stepped hole at the bottom is the same as the outer diameter of the collar 57 of the C-type quick-connect female 10. The bottom surface of the transmission sleeve 51 has a through hole with a diameter smaller than the outer diameter of the collar 57.

[0017] Insert the straight handle 59 into the transmission sleeve 51 until the bottom of the collar 57 of the C-type quick-connect female head 10 contacts the inner surface of the step of the transmission sleeve 51. At this time, the same number of elongated holes 511 are machined on the side wall of the transmission sleeve 51 at the position corresponding to the threaded hole 591 of the straight handle 59.

[0018] The spring ball plunger 52 passes through the elongated hole 511 of the transmission sleeve 51 and is screwed into the threaded hole 591 of the straight handle 59, fixing the transmission sleeve 51 and the straight handle 59 together; the spring ball plunger 52 is screwed into the threaded hole 591 of the straight handle 59 until the ball is completely protruding from the inner wall of the straight handle 59.

[0019] The hexagonal screw 53 is a stepped metal rod with a maximum diameter slightly smaller than the inner diameter of the straight shank handle 59. The middle part of it, which contacts the spring ball plunger 52, is machined with an inwardly recessed step 532. The lower end of the hexagonal screw 53 is a hexagonal screw head that is machined to match the internal hexagonal tapered bolt 8.

[0020] The spring ball plunger 52 extends into the recessed step 532 of the hexagonal screw 53, thereby fixing the hexagonal screw 53 and the straight handle 59.

[0021] The inner support mechanism 40 is connected to the disassembly handle 50. The lower end of the disassembly handle 50 is aligned with the upper end face of the inner support mechanism 40, so that the C-type quick-connect male head 7 of the inner support mechanism 40 is inserted into the C-type quick-connect female head 10 of the disassembly handle 50, and so that the multiple locking steel balls 101 on the lower inner side of the C-type quick-connect female head 10 are locked on the hemispherical groove 71 on the outer wall of the C-type quick-connect male head 7.

[0022] The number of hemispherical grooves 71 evenly distributed circumferentially in the middle of the outer side wall of the C-type quick-connect male connector 7 is 10 to 12.

[0023] The number of annular grooves 22 evenly distributed along the outer edge on the upper surface of the lower base 1 is 4 to 6.

[0024] The aforementioned internal hexagonal tapered bolt 8 is a tapered bolt with a taper of 5-10°.

[0025] The upper end of the hexagonal screw 53 is fitted with a metal handle 531 for easy screwing, the size of which is larger than the outer diameter of the straight handle 59.

[0026] A method for rapid assembly and disassembly of small-diameter deep-hole pipe butt welding, utilizing a rapid assembly and disassembly internal support fixture for butt welding of small-diameter deep-hole pipe, characterized by comprising the following steps:

[0027] Step 1: Quickly connect the disassembly handle 50 of this tooling to the inner support mechanism 40 through the C-type quick-connect male connector 7 and the C-type quick-connect female connector 10; insert one end of the inner support mechanism 40 into a deep hole tube 60 to be welded, until the inner support block 3 of the inner support mechanism 40 is in the welding position of the deep hole tube 60 to be welded.

[0028] Step 2: Connect the end of the other deep hole tube 60 to be welded to the previous deep hole tube 60 to be welded, so that the lower end of the other deep hole tube 60 to be welded is fitted over the inner support block 3.

[0029] Step 3: Tighten the hexagonal screw 53 to drive the internal hexagonal tapered bolt 8 of the internal support mechanism 40 to move downward, drive the internal support block 3 to extend outward, and tighten the deep hole tube 60 to be welded. After the internal support mechanism 40 is tightened, pull the transmission sleeve 51 of the disassembly handle 50 to separate the C-type quick-connect female head 10 and the C-type quick-connect male head 7, and remove the disassembly handle 50.

[0030] Step 4: Weld the joint between the two deep-hole pipes 60.

[0031] Step 5: After welding, pull the transmission sleeve 51 of the disassembly handle 50 to lift the collar 57 outside the female head 10 of the C-type quick connector. At this time, the locking steel ball 101 inside the female head 10 of the C-type quick connector is in a free state. Insert the disassembly handle 50 into the deep hole tube 60 to assemble the female head 10 and the male head 7 of the C-type quick connector without resistance. Then release the transmission sleeve 51, and the spring sleeve 102 causes the collar 57 of the female head 10 of the C-type quick connector to fall down. At this time, the locking steel ball 101 in the female head 10 of the C-type quick connector falls into the hemispherical groove 71 of the male head 7 of the C-type quick connector and locks it. Then rotate the hexagonal screw 53 in the opposite direction to drive the internal hexagonal tapered bolt 8 to move upward. The compression spring 4 of the inner support mechanism 40 pushes the top column 5 to move inward. At this time, the inner support block 3 retracts. By pulling the disassembly handle 50, the inner support mechanism 40 can be easily removed from the deep hole tube 60 to be welded.

[0032] This invention features a simple structure and is easy to use, overcoming the shortcomings of existing deep-hole pipe welding methods, such as low precision and unreliable welding quality. This invention utilizes internal welding supports to assist welding, ensuring assembly precision during the welding of deep-hole thin-walled pipes, and providing a method for rapid assembly and disassembly within the deep-hole pipe before and after welding. Attached Figure Description

[0033] Figure 1 1 is a schematic diagram of the tooling structure of the present invention;

[0034] Figure 2 This is a top view of the internal support mechanism 40 of the present invention;

[0035] Figure 3 ,yes Figure 2 Sectional view of AA;

[0036] Figure 4 ,yes Figure 3 Enlarged view of point B;

[0037] Figure 5 This is a schematic diagram of the lower base 1 structure;

[0038] Figure 6 ,yes Figure 5 Top view;

[0039] Figure 7 1 is a schematic diagram of the upper cover plate 2 structure;

[0040] Figure 8 ,yes Figure 7 Top view;

[0041] Figure 9 The diagram below is a schematic diagram of the disassembly and assembly of the handle 50 of this invention.

[0042] Among them, 1 is the lower base, 2 is the upper cover plate, 3 is the inner support block, 4 is the compression spring, 5 is the top column, 6 is the connecting screw, 7 is the C-type quick-connect male connector, 8 is the hexagonal conical bolt, 10 is the C-type quick-connect female connector, 11 is the cylindrical groove, 12 is the straight groove of the base, 13 is the semi-circular hole of the base, 14 is the annular groove of the base, 15 is the thin sidewall of the base, 16 is the threaded hole of the base, 17 is the bolt through hole, 21 is the countersunk through hole of the cover plate, 22 is the annular groove of the cover plate, 23 is the straight groove of the cover plate, 24 is the through hole of the cover plate, and 25 is the cover plate. Thin sidewall, 27 is a semi-circular hole in the cover plate, 31 is a threaded hole in the inner support block, 32 is a groove in the inner support block, 40 is an inner support mechanism, 50 is a disassembly handle, 51 is a transmission sleeve, 52 is a spring ball plunger, 53 is a hexagonal screw, 57 is a collar, 59 is a straight handle, 60 is a deep hole tube to be welded, 71 is a hemispherical groove, 101 is a locking steel ball, 102 is a spring sleeve, 171 is an internal thread, 501 is a metal ball, 511 is an oblong hole, 531 is a metal handle, 532 is an internally recessed step, 591 is a threaded hole, and 592 is a threaded post. Detailed Implementation

[0043] A quick-assembly and disassembly internal support fixture for butt welding of small-diameter deep-hole pipes. This fixture consists of two parts: an internal support mechanism 40 and a disassembly / assembly handle 50.

[0044] The internal support mechanism 40 consists of eight parts: a lower base 1, an upper cover plate 2, an internal support block 3, a compression spring 4, a top column 5, a connecting screw 6, an internal hexagonal tapered bolt 8, and a custom C-type quick-connect male connector 7.

[0045] The lower base 1 of the inner support mechanism 40 is a metal cylinder with a diameter slightly smaller than the inner diameter of the deep hole pipe 60 to be welded, and a countersunk threaded hole is machined in the center of the cylinder.

[0046] Multiple annular grooves 14 are evenly distributed along the outer edge on the upper surface of the lower base 1, preferably 4 to 6. Multiple straight grooves 12 are machined on the upper surface through the central axis and perpendicular to the annular grooves 14. A thin sidewall 15 is reserved between the straight grooves 12 and the annular grooves 14. A semi-circular hole 13 is machined on the thin sidewall 15.

[0047] On the upper surface of the lower base 1, threaded holes 16 are evenly distributed along the center line of the included angle between every two straight grooves.

[0048] The upper cover plate 2 is a metal disc with the same diameter as the lower base 1.

[0049] On the lower surface of the upper cover plate 2, at a position symmetrical to that of the lower base 1, the same cover plate annular groove 22 and cover plate straight groove 23 are machined, and the same cover plate thin sidewall 25 and cover plate semi-circular hole 27 are reserved.

[0050] A cover plate through hole 24, slightly smaller than the head of an internal hexagonal tapered bolt 8, is machined at the center of the upper surface of the upper cover plate 2. A cover plate countersunk through hole 21 is machined at the position corresponding to the threaded hole of the lower base 1 on the upper surface of the upper cover plate 2.

[0051] The inner support block 3 is a metal block with the same shape as the base annular groove 14 of the lower base 1. Its height is the sum of the depths of the cover plate annular groove 22 of the upper cover plate 2 and the base annular groove 14 of the lower base 1. An inner support block threaded hole 31 is machined at the center of the inner surface of the inner support block 3, and an inner support block groove 32 is machined at the horizontal center line of the outer surface of the inner support block 3.

[0052] The top post 5 is a metal rod with the same diameter as the semi-circular hole, with a thread on one end and a metal ball 501 with a diameter larger than that of the compression spring 4 at the other end.

[0053] The compression spring 4 is slightly larger than the diameter of the top post 5 and is fitted onto the top post 5.

[0054] The threaded end of the top post 5 passes through the semi-circular hole and is installed on the straight groove, while the compression spring 4 abuts against the thin sidewall of the groove.

[0055] The inner support block 3 is embedded in the annular groove 14 of the base, and the inner side of the inner support block 3 is connected to the top column 5 by threads.

[0056] The upper cover plate 2 is installed on the lower base 1 by connecting screws 6.

[0057] A C-type quick-connect male connector 7 is coaxially welded to the upper surface of the upper cover plate 2. Multiple hemispherical grooves 71 are evenly distributed around the outer side wall of the C-type quick-connect male connector 7, with the number preferably being 10 to 12.

[0058] The internal hexagonal tapered bolt 8 is passed through the C-type quick-connect male connector 7 and the center hole of the upper cover plate 2 and connected to the center threaded hole of the lower base 1 to form the internal support mechanism 40.

[0059] The disassembly and assembly handle 50 includes a straight handle 59, a C-type quick-connect female 10, a transmission sleeve 51, a hexagonal screw 53, and a spring ball plunger 52;

[0060] The straight handle 59 of the disassembly and assembly handle 50 is a straight metal tube with a diameter larger than that of the C-type quick-connect female head 10 and a wall thickness of about 5mm. The lower end is fitted with a threaded post to the C-type quick-connect female head 10. Multiple threaded holes 591 are machined circumferentially on the side wall of the straight handle 59 near the lower end at the same height. It is best to have 2 to 4 threaded holes.

[0061] A C-type quick-connect female connector 10 is installed at the lower end of the straight handle 59 via a threaded connection.

[0062] The transmission sleeve 51 is a metal tube with a stepped hole at the bottom. Its inner diameter is slightly larger than the outer diameter of the straight handle 59, and the diameter of the stepped hole at the bottom is equal to the collar of the C-type quick-connect female 10.

[0063] Insert the straight handle 59 into the transmission sleeve 51 until the bottom of the C-type quick-connect female head 10 contacts the inner surface of the step of the transmission sleeve 51. At this time, machine the same number of elongated holes on the side wall of the transmission sleeve 51 at the positions corresponding to the threaded holes of the straight handle 59.

[0064] The spring ball plunger 52 passes through the elongated hole of the transmission sleeve 51 and is screwed into the threaded hole of the straight handle 59 to fix it.

[0065] The spring ball plunger 52 is screwed into the threaded through hole of the straight handle 59 until the ball is fully protruding from the inner wall of the straight handle 59.

[0066] The hexagonal screw 53 is a stepped metal rod with a maximum diameter slightly smaller than the inner diameter of the straight shank handle 59. The middle part of it, which contacts the spring ball plunger 52, is machined with an inwardly recessed step, and its lower end is a hexagonal screw head that is machined to match the internal hexagonal tapered bolt 8.

[0067] The upper end of the hexagonal screw 53 can be fitted with a metal handle for easy screwing, the size of which is larger than the inner diameter of the straight handle 59.

[0068] The hexagonal screw 53 is fixed to the straight handle 59 by the spring ball plunger 52, forming the disassembly and assembly handle 50.

[0069] In use, after the two deep hole tubes 16 are assembled together, the disassembly handle 50 of this tool is quickly connected to the inner support mechanism 40 through the C-type quick connector. The inner support mechanism 40 is inserted from one side of the deep hole tube 16 into the inner support block 3 of the inner support mechanism 40 in the position to be welded. The hexagonal screw 53 is turned to drive the internal hexagonal tapered bolt 8 of the inner support mechanism 40 to move downward, driving the inner support block 3 to extend outward and tighten the deep hole tube 60 to be welded. After the inner support mechanism 40 is tightened, the sleeve of the disassembly handle 50 is pulled to separate the C-type quick connector female head 10 and the C-type quick connector male head 7, and the disassembly handle 50 is removed.

[0070] After welding, pull the transmission sleeve 51 of the disassembly handle 50 to lift the collar of the C-type quick-connect female head 10. At this time, the locking steel ball 102 inside the C-type quick-connect female head 10 is in a free state. Insert the disassembly handle 50 into the welded deep hole tube 60 to allow the C-type quick-connect female head 10 and the C-type quick-connect male head 7 to be assembled without resistance. Then release the sleeve to let the collar of the female head fall down. At this time, the locking steel ball in the female head falls into the hemispherical groove of the male head to lock it. Then turn the hexagonal screw 53 in the opposite direction to drive the internal hexagonal tapered bolt 8 to move upward. The compression spring 4 of the inner support mechanism 40 pushes the top column 5 to move inward. At this time, the inner support block 3 retracts. By pulling the disassembly handle 50, the inner support mechanism 40 can be easily removed from the welded deep hole tube 60.

[0071] Example:

[0072] The following examples will further illustrate this device:

[0073] This device proposes a quick-assembly and disassembly internal support fixture for 16-way butt welding of small-diameter deep-hole pipes. This fixture consists of two parts: an internal support mechanism 40 and an assembly / disassembly handle 50.

[0074] The internal support mechanism 40 includes a lower base 1, an upper cover plate 2, an internal support block 3, a compression spring 4, a top column 5, a connecting screw 6, an internal hexagonal tapered bolt 8, and a custom C-type quick-connect male connector 7.

[0075] The disassembly and assembly handle 50 consists of a straight handle 59, a C-type quick-connect female connector 10, a transmission sleeve 51, a hexagonal screw 53, and a spring ball plunger 52.

[0076] If two deep-hole tubes 16 are to be welded, the inner diameter of the deep-hole tube 16 is 36mm.

[0077] The lower base 1 of the inner support mechanism 40 is a metal cylinder with a diameter of 34mm and a height of 30mm. There is a stepped hole in the center of the cylinder, a countersunk hole with a diameter of 8mm on the upper side, and an M3 threaded hole on the lower side.

[0078] The upper surface of the lower base 1 is evenly machined with four 60° angled annular grooves along the outer edge, with a radial depth of 4mm and a depth of 2.5mm. Two straight grooves with a 90° angle are machined vertically to the annular grooves on the upper surface, with dimensions of 22×3×1.5mm. Four semi-circular grooves with a diameter of 2mm are machined on the side wall.

[0079] Four M2 threaded holes are evenly distributed on the upper surface of the lower base 1 at a 45° angle between every two straight grooves.

[0080] The upper cover plate 2 is a metal cylinder with a diameter of 34×10mm.

[0081] A groove of the same shape is machined at the position corresponding to the annular groove of the lower base 1 on the outer edge of the upper cover plate 2, and a groove is machined at the center position of the upper surface. The through hole is machined at the position corresponding to the threaded hole of the lower base 1 on the upper surface. Countersunk through hole.

[0082] The inner support block 3 is a metal block with the same shape as the annular groove of the lower base 1, and a height of 5mm. An M2 threaded hole is machined at the center of the inner surface of the inner support block 3, and a 2×2mm groove is machined at the center line of the outer surface of the inner support block 3.

[0083] The top post 5 is a metal rod with a thread at one end and a diameter of 2mm, and a metal ball with a diameter of 3mm at the other end.

[0084] The compression spring 4 has a wire diameter of 0.2mm, a diameter of 2.5mm, and a height of 5mm. It is fitted onto the top post 5.

[0085] The threaded end of the top column 5 passes through the semi-circular groove and is installed on the straight groove. The inner support block 3 is embedded in the lower annular groove and is connected to the top column 5 by threads.

[0086] Connecting screw 6 is an M2 countersunk screw.

[0087] The upper cover plate 2 is mounted on the lower base 1 by connecting screws 6.

[0088] A C-type quick-connect male connector 7 is coaxially welded to the upper surface of the upper cover plate 2. The outer side wall of the C-type quick-connect male connector 7 has 12 hemispherical grooves with a diameter of 3mm evenly distributed around it.

[0089] The M3 internal hexagonal tapered bolt 8 is passed through the custom C-type quick-connect male connector 7 and the center hole of the upper cover plate 2 and connected to the center threaded hole of the lower base 1 to form the internal support mechanism 40.

[0090] The straight handle 59 of the disassembly and assembly handle 50 is a metal straight tube with a diameter of 26×5mm. The lower end is fitted with a C-type quick-connect female head 10 with a machined threaded post, and the side wall near the lower end is machined with two M2 threaded through holes.

[0091] An SF40 type C quick-connect female connector 10 is installed at the lower end of the straight handle 59 via a threaded connection.

[0092] The transmission sleeve 51 is a metal tube with a stepped hole at the bottom, with an inner diameter of 28 mm and a stepped hole diameter of 26 mm.

[0093] Insert the straight handle 59 into the transmission sleeve 51 until the bottom of the C-type quick-connect female head 10 contacts the inner surface of the step of the transmission sleeve 51. At this time, two oblong holes of R2×6mm are machined on the side wall of the transmission sleeve 51 at the positions corresponding to the threaded holes of the straight handle 59.

[0094] First, use a spring ball plunger 52 with a specification of M3×8 to pass through the elongated hole of the transmission sleeve 51 and screw it into the threaded hole of the straight handle 59 to fix it.

[0095] The spring ball plunger 52 is screwed into the threaded through hole of the straight handle 59 until the ball is fully protruding from the inner wall of the straight handle 59.

[0096] The hexagonal screw 53 is a stepped metal rod with a maximum diameter of 16mm. The middle part of it, which contacts the spring ball plunger 52, is machined with an inwardly recessed step, and its lower end is a hexagonal screw head that is machined to match the M3 internal hexagonal tapered bolt 8.

[0097] A hexagonal screw 53 is machined at the upper end. The metal handle has a hobbing pattern on its surface to increase friction.

[0098] The hexagonal screw 53 is fixed to the straight handle 59 by the spring ball plunger 52, forming the disassembly and assembly handle 50.

[0099] In use, after the two deep hole tubes 16 are assembled together, the disassembly handle 50 of this tool is quickly connected to the inner support mechanism 40 through the C-type quick connector. The inner support mechanism 40 is inserted from one side of the deep hole tube 60 until it is in the position to be welded. The hexagonal screw 53 is turned to drive the internal hexagonal tapered bolt 8 of the inner support mechanism 40 to move downward, driving the inner support block 3 to extend outward and tighten the deep hole tube 60 to be welded. After the inner support mechanism 40 is tightened, the sleeve of the disassembly handle 50 is pulled to separate the C-type quick connector female head 10 and the C-type quick connector male head 7, and the disassembly handle 50 is removed.

[0100] After welding, pull the transmission sleeve 51 of the disassembly handle 50 to lift the collar of the female C-type quick connector. At this time, the locking steel ball inside the female C-type quick connector is in a free state. Insert the disassembly handle 50 into the welded deep hole tube 60 to allow the female and male connectors to be assembled without resistance. Then, release the sleeve to allow the collar of the female connector to fall down. At this time, the locking steel ball in the female connector falls into the hemispherical groove of the male connector and locks it. Then, rotate the hexagonal screw 53 in the opposite direction to drive the internal hexagonal tapered bolt 8 to move upward. The compression spring 4 of the inner support mechanism 40 pushes the top column 5 to move inward. At this time, the inner support block 3 retracts. By pulling the disassembly handle 50, the inner support mechanism 40 can be easily removed from the welded deep hole tube 60.

Claims

1. A quick-assembly and disassembly internal support fixture for butt welding of small-diameter deep-hole pipes, characterized in that, It includes an internal support mechanism (40) and a disassembly handle (50); the disassembly handle (50) is connected to the upper part of the internal support mechanism (40); The internal support mechanism (40) includes a lower base (1), an upper cover plate (2), an internal support block (3), a compression spring (4), a top column (5), a connecting screw (6), an internal hexagonal tapered bolt (8), and a C-type quick-connect male connector (7). The lower base (1) is a metal cylinder with an outer diameter slightly smaller than the inner diameter of the deep hole tube (60) to be welded. A cylindrical groove (11) is machined in the center of the lower base (1). Multiple annular grooves (14) are evenly distributed along the outer edge of the upper surface of the lower base (1). Multiple straight grooves (12) are machined in the direction of the line connecting the central axis of the upper surface of the lower base (1) and the midpoint of the annular groove (14). A thin sidewall (15) is left between the straight groove (12) and the annular groove (14). A semi-circular hole (13) is machined on the thin sidewall (15). Threaded holes (16) are evenly distributed on the upper surface of the lower base (1) along the center line of the included angle between every two straight grooves (12). A bolt through hole (17) is machined at the center of the bottom of the cylindrical groove (11) of the lower base (1). An internal thread (171) is provided at the top of the bolt through hole. The upper cover plate (2) is a metal disc with the same diameter as the lower base (1); corresponding cover plate annular grooves (22) and cover plate straight grooves (23) are machined on the lower surface of the upper cover plate (2) at positions symmetrical to the lower base (1); the upper cover plate (2) and the lower base (1) have corresponding positions with thin sidewalls (25) and semi-circular holes (27); a cover plate through hole (24) slightly smaller than the head diameter of the internal hexagonal tapered bolt (8) is machined at the center position of the upper surface of the upper cover plate (2); a cover plate countersunk through hole (21) is machined on the upper surface of the upper cover plate (2) at the corresponding position of the base thread hole (16) of the lower base (1). The inner support block (3) is a metal block with the same shape as the annular groove (14) on the upper surface of the lower base (1). Its height is the sum of the depths of the annular groove (22) on the upper cover plate (2) and the annular groove (14) on the lower base (1). An inner support block threaded hole (31) is machined at the center of the inner surface of the inner support block (3), and an inner support block groove (32) is machined horizontally at the center of the outer surface of the inner support block (3). The top post (5) is a metal rod with the same diameter as the semi-circular hole (13) of the base, one end is threaded, and the other end is a metal ball (501) with a diameter greater than that of the compression spring (4); the compression spring (4) is slightly larger than the diameter of the top post (5), and the compression spring (4) is sleeved on the top post (5); the threaded end of the top post (5) passes through the semi-circular hole (13) of the base and is installed on the straight groove (12) of the base, and the compression spring (4) abuts against the thin sidewall (15) of the base on the side of the straight groove (12); the inner support block (3) is embedded in the annular groove (14) of the base on the upper surface, and the inner support block (3) is connected to the top post (5) by threads; The upper cover plate (2) is mounted on the lower base (1) by connecting screws (6); The C-type quick-connect male connector (7) is a metal tube with an inner diameter slightly larger than the diameter of the cover plate through hole (24). The C-type quick-connect male connector (7) is coaxially welded to the upper surface of the upper cover plate (2). Multiple hemispherical grooves (71) are evenly distributed in the middle of the outer side wall of the C-type quick-connect male connector (7). The internal hexagonal tapered bolt (8) is passed through the C-type quick-connect male connector (7) and the cover plate through hole (24) of the upper cover plate (2) and connected to the internal thread (171) on the bolt through hole (17) of the lower base (1); The disassembly handle (50) includes a straight handle (59), a C-type quick-connect female (10), a transmission sleeve (51), a hexagonal screw (53), and a spring ball plunger (52). The straight handle (59) of the disassembly handle (50) is a straight metal tube with an outer diameter larger than the outer diameter of the C-type quick-connect female (10) and an inner diameter smaller than the inner diameter of the C-type quick-connect female (10). The outer diameter of the lower end of the straight handle (59) becomes smaller, and the smaller outer diameter is matched with the C-type quick-connect female (10) to be machined with a threaded post (592). Two to four threaded holes (591) are machined circumferentially on the side wall of the straight handle (59) near the lower end at the same height. The C-type quick-connect female connector (10) is connected to the lower end of the straight handle (59) by a thread; the collar (57) is fitted onto the lower part of the C-type quick-connect female connector (10) by a spring sleeve (102) to achieve vertical sliding at the lower part of the C-type quick-connect female connector (10); The transmission sleeve (51) is a metal tube with a stepped hole at the bottom. Its inner diameter is slightly larger than the maximum outer diameter of the straight handle (59). The inner diameter of the stepped hole at the bottom is the same as the outer diameter of the collar (57) of the C-type quick-connect female (10). The bottom surface of the transmission sleeve (51) has a through hole with a diameter smaller than the outer diameter of the collar (57). Insert the straight handle (59) into the transmission sleeve (51) until the bottom of the collar (57) of the C-type quick-connect female (10) contacts the inner surface of the step of the transmission sleeve (51). At this time, the same number of elongated holes (511) are machined on the side wall of the transmission sleeve (51) at the position corresponding to the threaded hole (591) of the straight handle (59). The spring ball plunger (52) passes through the elongated hole (511) of the transmission sleeve (51) and is screwed into the threaded hole (591) of the straight handle (59), fixing the transmission sleeve (51) and the straight handle (59) together; the spring ball plunger (52) is screwed into the threaded hole (591) of the straight handle (59) until the ball is completely protruding from the inner wall of the straight handle (59); The hexagonal screw (53) is a stepped metal rod with a maximum diameter slightly smaller than the inner diameter of the straight handle (59). The middle part of the rod that contacts the spring ball plunger (52) has an inwardly recessed step (532). The lower end of the hexagonal screw (53) is a hexagonal screw head that is machined to match the internal hexagonal tapered bolt (8). By inserting the spring ball plunger (52) into the recessed step (532) of the hexagonal screw (53), the hexagonal screw (53) and the straight handle (59) are fixed together; The inner support mechanism (40) is connected to the disassembly handle (50). The lower end of the disassembly handle (50) is aligned with the upper end face of the inner support mechanism (40), and the C-type quick-connect male connector (7) of the inner support mechanism (40) is inserted into the C-type quick-connect female connector (10) of the disassembly handle (50). Multiple locking steel balls (101) on the lower inner side of the C-type quick-connect female connector (10) are locked on the hemispherical groove (71) on the outer wall of the C-type quick-connect male connector (7).

2. The quick-assembly and disassembly internal support fixture for butt welding of small-diameter deep-hole pipes according to claim 1, characterized in that, The C-type quick-connect male connector (7) has 10 to 12 hemispherical grooves (71) evenly distributed in the middle of the outer side wall.

3. The quick-assembly and disassembly internal support fixture for butt welding of small-diameter deep-hole pipes according to claim 1, characterized in that, The number of annular grooves (22) evenly distributed along the outer edge on the upper surface of the lower base (1) is 4 to 6.

4. The quick-assembly and disassembly internal support fixture for butt welding of small-diameter deep-hole pipes according to claim 1, characterized in that, The internal hexagonal tapered bolt (8) is a tapered bolt with a taper of 5-10°.

5. The quick-assembly and disassembly internal support fixture for butt welding of small-diameter deep-hole pipes according to claim 1, characterized in that, The upper end of the hexagonal screw (53) is fitted with a metal handle (531) for easy screwing, the size of which is larger than the outer diameter of the straight handle (59).

6. A method for rapid assembly and disassembly of small-diameter deep-hole pipe butt welding, utilizing the internal support fixture for rapid assembly and disassembly of small-diameter deep-hole pipe butt welding as described in any one of claims 1 to 5, characterized in that... Includes the following steps: Step 1: Quickly connect the disassembly handle (50) of this tooling to the inner support mechanism (40) through the C-type quick-connect male connector (7) and the C-type quick-connect female connector (10); insert one end of the inner support mechanism (40) into a deep hole tube (60) to be welded, until the inner support block (3) of the inner support mechanism (40) is in the welding position of the deep hole tube (60); Step 2: Connect the welding end of another deep hole tube (60) to the previous deep hole tube (60) and assemble it so that the lower end of the other deep hole tube (60) is fitted outside the inner support block (3); Step 3: Tighten the hexagonal screw (53) to drive the internal hexagonal conical bolt (8) of the internal support mechanism (40) to move downward, drive the internal support block (3) to extend outward, and tighten the deep hole tube (60) to be welded. After the internal support mechanism (40) is tightened, pull the transmission sleeve (51) of the disassembly handle (50) to separate the C-type quick-connect female head (10) and the C-type quick-connect male head (7), and take out the disassembly handle (50). Step 4: Weld the joint between the two deep hole pipes (60) to be welded; Step 5: After welding, pull the transmission sleeve (51) of the disassembly handle (50) to lift the collar (57) outside the C-type quick-connect female (10). At this time, the locking steel ball (101) inside the C-type quick-connect female (10) is in a free state. Insert the disassembly handle (50) into the deep hole tube (60) to be welded, so that the C-type quick-connect female (10) and the C-type quick-connect male (7) are assembled without resistance. Then release the transmission sleeve (51), and the spring sleeve (102) will allow the C-type quick-connect female (10) to be welded. When the collar (57) of the C-type quick-connect female (10) falls down, the locking steel ball (101) in the C-type quick-connect male (7) falls into the hemispherical groove (71) of the C-type quick-connect male (7) and locks it; then the hexagonal screw (53) is rotated in the opposite direction to drive the internal hexagonal tapered bolt (8) to move upward, and the compression spring (4) of the inner support mechanism (40) pushes the top column (5) to move inward. At this time, the inner support block (3) retracts, and the inner support mechanism (40) can be easily removed from the deep hole tube (60) to be welded by pulling the disassembly handle (50).

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