Welding device for precision machining

Abstract

The invention relates to the technical field of welding, and discloses a precision machining welding device which comprises a base, two pairs of supporting rods are symmetrically and fixedly mounted at the top of the base, and a first rotating seat and a second rotating seat are rotationally mounted between the tops of the two pairs of supporting rods correspondingly; placing seats are fixedly mounted at the tops of the first rotating seat and the second rotating seat, V-shaped grooves used for placing round pipes are formed in the tops of the two placing seats, a first round pipe and a second round pipe are placed in the two V-shaped grooves correspondingly, and the opposite ends of the first round pipe and the second round pipe obliquely abut against each other; a first adjustable fastening structure used for clamping the first circular pipe is mounted at the top of the first rotating seat, and a second adjustable fastening structure used for clamping the second circular pipe is mounted at the top of the second rotating seat; the welding device for precision mechanical machining is provided with an accurate angle adjusting and butt joint fixing structure, the welding speed and efficiency are improved through the performance of the welding device, and the use requirement of precision mechanical welding machining can be met.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding, and specifically relates to a welding device for precision machining. Background Art

[0002] Machining refers to the process of changing the shape, size, surface quality and other properties of a workpiece through mechanical equipment and tools, using methods such as cutting, grinding, electric discharge machining, welding, etc., to manufacture it into a part or product that meets the requirements; it is the core process of the manufacturing industry and is widely used in various industrial fields.

[0003] During the process of some precision machining, it is often necessary to perform welding operations on round tube components; when traditionally performing welding operations on two round tubes at different angles, it is usually necessary to use welding fixing equipment to fix one of the round tubes, and then a worker holds the other round tube with one hand and aligns and docks it with the fixed tube, while the worker's other hand performs the welding operation. When the welded tube is relatively thick, it is impossible for the worker to stably hold and align and dock the tube, so it is impossible to stably perform docking and welding operations, and it is necessary to repeatedly perform docking adjustment. This kind of welding operation is slow and inefficient; therefore, in view of the above problems, improvements are needed now. Summary of the Invention

[0004] To achieve the above object, the present invention provides the following technical solution: A welding device for precision machining, including a base, on the top of the base, two pairs of support rods are symmetrically and fixedly installed. Between the tops of the two pairs of support rods, a first rotating seat and a second rotating seat are respectively rotatably installed. On the tops of the first rotating seat and the second rotating seat, placing seats are fixedly installed. On the tops of the two placing seats, V-shaped grooves for placing round tubes are respectively opened. Inside the two V-shaped grooves, a first round tube and a second round tube are respectively placed. The opposite ends of the first round tube and the second round tube are inclined and in contact with each other. On the top of the first rotating seat, a first adjustable fastening structure for clamping the first round tube is installed. On the top of the second rotating seat, a second adjustable fastening structure for clamping the second round tube is installed.

[0005] Preferably, on the top of the base, first grooves are symmetrically opened. In the middle of the base, a double-output shaft motor is installed. In the middle of the two first grooves, threaded shafts are symmetrically and rotatably connected. The opposite ends of the two threaded shafts are respectively fixedly connected to the two output ends of the double-output shaft motor. On the surfaces of the two threaded shafts, moving blocks are threadedly connected.

[0006] Preferably, on the tops of the two moving blocks, vertical rods are fixedly installed. At the tops of the vertical rods, adjusting rods are rotatably connected. At the bottoms of the first rotating seat and the second rotating seat, push rods are fixedly connected. Between the adjacent push rods and the adjusting rods, rotational connections are made.

[0007] Preferably, the first adjustable fastening structure includes an N-shaped plate fixedly installed in the middle of the top of the first rotating seat, a second groove is opened on the top of the inner side of the N-shaped plate, a sliding rod is fixedly installed inside the second groove, two second sliders and two second sliders are movably sleeved on the surface of the sliding rod, the two second sliders are located between the two first sliders, both ends of the bottom of the two second sliders are rotatably connected to the extrusion arms, and a telescopically adjustable first pressure plate is installed between the bottoms of the four extrusion arms.

[0008] Preferably, a first spring is sleeved on the middle part of the sliding rod, and the two ends of the first spring are fixedly connected to the two second sliders B respectively. A T-shaped rod is movably inserted into the lower part of the two first sliders, and the opposite ends of the two T-shaped rods are fixedly connected to the two second sliders respectively. The surfaces of the two T-shaped rods are sleeved with a second spring, and the two ends of the second spring are fixedly connected to the first slider and the second slider respectively.

[0009] Preferably, two third grooves are symmetrically opened in the middle of the top of the first rotating seat, and a bidirectional threaded shaft is rotatably installed between the inside of the two third grooves. The surfaces of the bidirectional threaded shaft located inside the two third grooves are threadedly connected with movable plates, and the tops of the two movable plates and the bottoms of the two first sliders are respectively rotatably connected with linkage plates.

[0010] Preferably, one end of the bidirectional threaded shaft extends to the outside of one side of the first rotating seat and is fixedly connected to a transmission gear, a vertical plate is fixedly installed on the top of the base, and a semicircular tooth plate is fixedly installed on one side of the upper part of the vertical plate, the semicircular tooth plate matches the moving trajectory of the transmission gear, and the transmission gear is meshed with the semicircular tooth plate.

[0011] Preferably, first ball-locking grooves are provided on both sides of the bottom of the first pressure plate at equal distances, first balls are installed inside the first ball-locking grooves, the first balls contact the surface of the first circular tube, and first inclined holes are provided inside the first ball-locking grooves, third springs are installed on the tops of the first inclined holes, and the ends of the third springs located inside the first ball-locking grooves are fixed with first arc-shaped contact blocks that match and contact the first balls.

[0012] Preferably, the second adjustable fastening structure includes a second pressure plate, second ball-locking grooves are equidistantly provided on both sides of the bottom of the first pressure plate, second balls are installed inside the second ball-locking grooves, the second balls are in contact with the surface of the second circular tube, and second inclined holes are provided inside the second ball-locking grooves, fourth springs are installed on the tops of the second inclined holes, and a second arc-shaped interference block that matches and contacts the second ball is fixedly installed at the end of the fourth spring located inside the second ball-locking groove, and a rotating plate is fixedly installed on one side of the second pressure plate.

[0013] Preferably, two fixing blocks are fixedly installed on the top of the second rotating seat. A rotating shaft is rotatably connected between the upper parts of the two fixing blocks. One side of the rotating plate is fixedly connected to the rotating shaft. One end of the rotating shaft extends outside one side of one of the fixing blocks and is fixedly installed with a worm gear. A worm meshing with the worm gear is rotatably installed on one side of one of the fixing blocks, and an adjusting wheel is fixedly installed on the top of the worm.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] (1) This welding device for precision machining has a precise angle adjustment and docking fixation structure. This precise angle adjustment and docking fixation structure can enable the butt joint connection of two circular pipes at different angles, and at the same time can effectively ensure the stability and firmness of the pipe butt joint connection, thereby effectively improving the accuracy of pipe welding. And the docking fixation structure can effectively move the pipe and adjust the docking position, thus improving the convenience of pipe welding; at the same time, the structure of this welding device is simply designed, and the use and adjustment operations are convenient and fast. The docking fixation is stable and reliable. Its performance improves the welding speed and efficiency and can meet the usage requirements of precision machining welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0017] In the drawings:

[0018] Figure 1 is a front view structural schematic diagram of the welding device for precision machining of the present invention;

[0019] Figure 2 is of the present invention Figure 1 partial rear view cross-sectional structural schematic diagram;

[0020] Figure 3 is a side cross-sectional structural schematic diagram of the first rotating seat and the first adjustable fastening structure of the present invention;

[0021] Figure 4 is of the present invention Figure 3 partial structural schematic diagram;

[0022] Figure 5 is of the present invention Figure 1 partial structural schematic diagram;

[0023] Figure 6 is of the present invention Figure 5 partial side view structural schematic diagram;

[0024] In the figure: 1, base; 2, support rod; 3, first rotating seat; 4, second rotating seat; 5, placing seat; 6, first circular tube; 7, second circular tube; 8, first adjustable fastening structure; 9, second adjustable fastening structure; 10, first groove; 11, double-output shaft motor; 12, threaded shaft; 13, moving block; 14, vertical rod; 15, adjusting rod; 16, pushing rod; 21, n-shaped plate; 22, second groove; 23, sliding rod; 24, second slider; 25, second slider; 26, squeezing arm; 27, first pressing plate; 28, first spring; 29, T-shaped rod; 30, second spring; 31, third groove; 32, bidirectional threaded shaft; 33, moving plate; 34, linkage plate; 35, transmission gear; 36, vertical plate; 37, semi-circular tooth plate; 39, first ball socket; 40, first roller; 41, first inclined hole; 42, third spring; 43, first arc-shaped abutting block; 44, second pressing plate; 45, second ball socket; 46, second ball; 47, second inclined hole; 48, fourth spring; 49, second arc-shaped abutting block; 50, rotating plate; 51, fixed block; 52, rotating shaft; 53, worm gear; 54, worm; 55, adjusting wheel. Detailed implementation manner

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Embodiment 1 is given by Figures 1 to 6 This invention includes a base 1. Two pairs of support rods 2 are symmetrically and fixedly installed at the top of the base 1. A first rotating seat 3 and a second rotating seat 4 are respectively rotatably installed between the tops of the two pairs of support rods 2. Placing seats 5 are fixedly installed at the tops of the first rotating seat 3 and the second rotating seat 4. V-shaped grooves for placing circular tubes are opened at the tops of the two placing seats 5. A first circular tube 6 and a second circular tube 7 are respectively placed inside the two V-shaped grooves. The relative ends of the first circular tube 6 and the second circular tube 7 are inclined and abutted against each other. The relative ends of the first circular tube 6 and the second circular tube 7 are cutting and welding ends. Through the welding angles provided by the first circular tube 6 and the second circular tube 7, the relative ends of the first circular tube 6 and the second circular tube 7 are both inclined and cut into half of the welding angle. After that, the angle formed after the relative ends of the first circular tube 6 and the second circular tube 7 are abutted against each other is the required welding angle. A first adjustable fastening structure 8 for clamping the first circular tube 6 is installed at the top of the first rotating seat 3, and a second adjustable fastening structure 9 for clamping the second circular tube 7 is installed at the top of the second rotating seat 4.

[0027] The top of the base 1 is symmetrically provided with first grooves 10. A double-output shaft motor 11 is installed in the middle of the base 1. The middle parts of the two first grooves 10 are symmetrically and rotatably connected with threaded shafts 12. The opposite ends of the two threaded shafts 12 are respectively fixedly connected with the two output ends of the double-output shaft motor 11. The surfaces of the two threaded shafts 12 are both threadedly connected with moving blocks 13; the tops of the two moving blocks 13 are both fixedly installed with vertical rods 14, and the tops of the vertical rods 14 are both rotatably connected with adjusting rods 15. The bottoms of the first rotating seat 3 and the second rotating seat 4 are both fixedly connected with push rods 16, and the adjacent push rods 16 and the adjusting rods 15 are rotatably connected; thus, the first rotating seat 3 and the second rotating seat 4 can be rotated and adjusted synchronously, so that the included angle between the first rotating seat 3 and the second rotating seat 4 can meet the requirements of the welding and butt-joint angles of the first circular tube 6 and the second circular tube 7.

[0028] According to the provided welding angles of the first circular tube 6 and the second circular tube 7, the relative ends of the first circular tube 6 and the second circular tube 7 are cut and processed by half of the welding angle at the same time; then the first circular tube 6 and the second circular tube 7 are respectively placed inside the V-shaped grooves of the two placing seats 5. At this time, the first circular tube 6 and the second circular tube 7 are in a horizontal state, so that the cutting and welding ends of the first circular tube 6 and the second circular tube 7 are opposite to each other, and then the second circular tube 7 is fixed respectively by the second adjustable fastening structure 9;

[0029] Then start the double-output shaft motor 11 to make the two threaded shafts 12 rotate. The rotation of the two threaded shafts 12 will make the two moving blocks 13 move synchronously away from each other. The two relatively moving moving blocks 13 will make the first rotating seat 3 and the second rotating seat 4 rotate relatively synchronously through the vertical rods 14, the adjusting rods 15 and the push rods 16, and finally make the included angle between the first rotating seat 3 and the second rotating seat 4 meet the requirements of the welding angle; at the same time, the rotation of the first rotating seat 3 drives the first adjustable fastening structure 8 to fix the first circular tube 6. When the first rotating seat 3 starts to rotate, the first circular tube 6 that rotates with the first rotating seat 3 is fixed manually to prevent the first circular tube 6 from sliding and moving. Finally, until the first adjustable fastening structure 8 effectively fixes the first circular tube 6, the first circular tube 6 can be released.

[0030] This welding device for precision machining has a precise angle adjustment and butt-joint fixing structure. This precise angle adjustment and butt-joint fixing structure can make two circular tubes be butt-joint connected at different angles, and at the same time can effectively ensure the stability and firmness of the pipe butt-joint connection, thus effectively improving the precision of pipe welding. And the butt-joint fixing structure can effectively move the pipe and adjust the butt-joint position, thus improving the convenience of pipe welding; at the same time, the structure design of this welding device is simple, the use and adjustment operations are convenient and fast, the butt-joint fixing is stable and reliable, and its performance improves the welding speed and efficiency and can meet the use requirements of precision machining welding.

[0031] Embodiment 2. On the basis of Embodiment 1, the first adjustable fastening structure 8 includes an n-shaped plate 21 fixedly installed in the middle of the top of the first rotating seat 3. A second groove 22 is opened at the top inside the n-shaped plate 21. A slide bar 23 is fixedly installed inside the second groove 22. The surface of the slide bar 23 is movably sleeved with two second sliders 24 and two second sliders 25. The two second sliders 25 are located between the two first sliders 24. The two ends of the bottoms of the two second sliders 25 are respectively rotatably connected with extrusion arms 26. A first pressing plate 27 with telescopic adjustment is installed between the bottoms of the four extrusion arms 26. An arc-shaped pressing groove matching the first round tube 6 is opened at the bottom of the first pressing plate 27.

[0032] A first spring 28 is sleeved in the middle of the slide bar 23. The two ends of the first spring 28 are respectively fixedly connected with the two second sliders B25. The lower parts of the two first sliders 24 are movably inserted with T-shaped rods 29. The opposite ends of the two T-shaped rods 29 are respectively fixedly connected with the two second sliders 25. The surfaces of the two T-shaped rods 29 are sleeved with second springs 30. The two ends of the second springs 30 are respectively fixedly connected with the first sliders 24 and the second sliders 25. Two third grooves 31 are symmetrically opened in the middle of the top of the first rotating seat 3. A bidirectional threaded shaft 32 is rotatably installed between the interiors of the two third grooves 31. Moving plates 33 are respectively threadedly connected to the surfaces of the bidirectional threaded shaft 32 located inside the two third grooves 31. Linking plates 34 are respectively rotatably connected between the tops of the two moving plates 33 and the bottoms of the two first sliders 24.

[0033] One end of the bidirectional threaded shaft 32 extends to the outside of one side of the first rotating seat 3 and is fixedly connected with a transmission gear 35. A vertical plate 36 is fixedly installed on the top of the base 1. A semi-circular toothed plate 37 is fixedly installed on one side of the upper part of the vertical plate 36. The moving track of the semi-circular toothed plate 37 matches that of the transmission gear 35, and the transmission gear 35 is meshed and connected with the semi-circular toothed plate 37. Thus, the telescopic movement adjustment of the pressing plate 27 can be effectively carried out.

[0034] When the first rotating seat 3 rotates, it will drive the transmission gear 35 to roll and rotate on the semicircular tooth plate 37. The rolling and rotating movement of the transmission gear 35 will drive the bidirectional threaded shaft 32 to rotate. The rotation of the bidirectional threaded shaft 32 will cause the two movable plates 33 to move relative to each other. The two relatively moving movable plates 33 will push the two first sliders 24 to move relative to each other through the two linking plates 34. The two relatively moving first sliders 24 will push the two second sliders 25 to move relative to each other through the T-shaped rod 29 and the second spring 30 to compress the first spring 28. At the same time, the two relatively moving first sliders 24 will compress the two second springs 30; and the two relatively moving second sliders 25 will push the first pressing plate 27 toward the first circular tube 6 through the four squeezing arms 26 to clamp it so that the first circular tube 6 will not slip down when it rotates and tilts.

[0035] The rotating axis of the first rotating seat 3 is located at the center of the semicircular tooth plate 37, and a ninety-degree angle measuring ruler is fixedly installed at the center of one side of the semicircular tooth plate 37. The rotating axis of the first rotating seat 3 extends to the outside of one side of the semicircular tooth plate 37 and is fixedly installed with an angle indicating rod. The ninety-degree angle measuring ruler and the angle indicating rod can accurately adjust the angles of the first rotating seat 3 and the first circular tube 6 as well as the second rotating seat 4 and the second circular tube 7.

[0036] When the first rotating seat 3 rotates, the angle indicator rod is driven to rotate through the rotating shaft, so that the angle indicator rod can accurately adjust the angle of the first rotating seat 3 through the scale of the ninety-degree angle measuring ruler, and at the same time, the second rotating seat 4 can accurately adjust the angle along with the first rotating seat 3.

[0037] First ball-catching grooves 39 are provided on both sides of the bottom of the first pressure plate 27 at equal distances. The first ball-catching grooves 39 are located inside the arc-shaped pressure groove. First balls 40 are installed inside the first ball-catching grooves 39. The first balls 40 are in contact with the surface of the first circular tube 6. First inclined holes 41 are provided inside the first ball-catching grooves 39. Third springs 42 are installed on the tops of the first inclined holes 41. The ends of the third springs 42 located inside the first ball-catching grooves 39 are fixed with first arc-shaped contact blocks 43 that match and contact the first balls 40. This ensures that the first circular tube 6 does not slip when tilted while being able to move and rotate the first circular tube 6.

[0038] When the pressing plate 27 moves towards the first circular tube 6, the first ball 40 will contact the surface of the first circular tube 6. As the pressing plate 27 continues to move, the first ball 40 will compress the third spring 42 through the first arc-shaped contact block 43. At the same time, through the elastic restoring force of the third spring 42, the first arc-shaped contact block 43 and the first ball 40 will effectively contact and rub, so that the inclined first circular tube 6 cannot drive the first ball 40 to rotate under its own weight, effectively avoiding the downward movement of the first circular tube 6.

[0039] When it is necessary to move or rotate and adjust the first circular tube 6, by manually pushing or rotating the first circular tube 6 with force, the moving force or rotational force of the first circular tube 6 is made greater than the frictional force between the first arc-shaped contact block 43 and the first ball 40. At this time, the first circular tube 6 can be moved or rotated and adjusted, so that the relative ends of the first circular tube 6 and the second circular tube 7 can be effectively aligned and docked.

[0040] Embodiment 3, on the basis of Embodiment 1, the second adjustable fastening structure 9 includes a second pressing plate 44. An arc-shaped pressing groove matching the second circular tube 7 is opened at the bottom of the second pressing plate 44. Second ball grooves 45 are equidistantly opened on both sides of the bottom of the first pressing plate 27. The second ball grooves 45 are located inside the arc-shaped pressing groove. Second balls 46 are installed inside the second ball grooves 45. The second balls 46 contact the surface of the second circular tube 7. Second inclined holes 47 are opened inside the second ball grooves 45. Fourth springs 48 are installed at the tops of the second inclined holes 47. Second arc-shaped contact blocks 49 matching and contacting the second balls 46 are fixedly installed at the ends of the fourth springs 48 located inside the second ball grooves 45. A rotating plate 50 is fixedly installed on one side of the second pressing plate 44.

[0041] Two fixing blocks 51 are fixedly installed at the top of the second rotating seat 4. A rotating shaft 52 is rotatably connected between the upper parts of the two fixing blocks 51. One side of the rotating plate 50 is fixedly connected to the rotating shaft 52. One end of the rotating shaft 52 extends outside one side of one of the fixing blocks 51 and is fixedly installed with a worm gear 53. A worm 54 meshing with the worm gear 53 is rotatably installed on one side of one of the fixing blocks 51. An adjusting wheel 55 is fixedly installed at the top of the worm 54, so that the second adjustable fastening structure 9 can be effectively adjusted, and the second adjustable fastening structure 9 presses and fixes the second circular tube 7 to ensure the stability of the angle adjustment.

[0042] When the second round tube 7 is placed inside the V-shaped groove on the placement seat 5, the worm 54 is rotated by rotating the adjusting wheel 55 to drive the worm gear 53 to rotate. The rotation of the worm gear 53 drives the rotating shaft 52 and the rotating plate 50 to rotate. The rotation of the rotating plate 50 drives the second pressing plate 44 to rotate, so that the second pressing plate 44 makes the second ball 46 contact the surface of the second round tube 7 through the arc-shaped pressing groove, the fourth spring 48 and the second arc-shaped contact block 49. At the same time, the elastic restoring force of the fourth spring 48 causes the second ball 46 to effectively contact and rub with the surface of the second round tube 7; then, the rotation of the second rotating seat 4 drives the fixed second round tube 7 to rotate and tilt without sliding;

[0043] When the second round tube 7 needs to be moved or rotated, the second round tube 7 is manually pushed or rotated so that the moving force or rotational force of the second round tube 7 is greater than the friction between the second ball 46 and the second round tube 7. At this time, the second round tube 7 can be moved or rotated so that the opposite ends of the first round tube 6 and the second round tube 7 can be effectively aligned and docked. Then, the first round tube 6 and the second round tube 7 are welded by external welding equipment.

[0044] After welding is completed, by rotating the adjusting wheel 55 in the reverse direction, the second pressure plate 44 is finally rotated and away from the second round tube 7; at the same time, by starting the double-output shaft motor 11 in the reverse direction, the first rotating seat 3 and the second rotating seat 4 are finally rotated and adjusted to a horizontal state. The rotation of the first rotating seat 3 will drive the welded first round tube 6 and the second round tube 7 to rotate, and the adjustment of the first rotating seat 3 to a horizontal state will separate the first pressure plate 27 from the first round tube 6, thereby facilitating the disassembly of the welded first round tube 6 and the second round tube 7.

[0045] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0046] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A welding device for precision machining, comprising a base (1), characterized in that: On the top of the base (1), two pairs of support rods (2) are symmetrically and fixedly installed. Between the tops of the two pairs of support rods (2), a first rotating seat (3) and a second rotating seat (4) are respectively rotatably installed. On the tops of the first rotating seat (3) and the second rotating seat (4), placing seats (5) are fixedly installed. On the tops of the two placing seats (5), V-shaped grooves for placing round tubes are provided. Inside the two V-shaped grooves, a first round tube (6) and a second round tube (7) are respectively placed. The opposite ends of the first round tube (6) and the second round tube (7) are inclined and in contact with each other. On the top of the first rotating seat (3), a first adjustable fastening structure (8) for clamping the first round tube (6) is installed. On the top of the second rotating seat (4), a second adjustable fastening structure (9) for clamping the second round tube (7) is installed.

2. The welding device for precision machining according to claim 1, characterized in that: On the top of the base (1), first grooves (10) are symmetrically provided. In the middle of the base (1), a double-output shaft motor (11) is installed. In the middle of the two first grooves (10), threaded shafts (12) are symmetrically and rotatably connected. The opposite ends of the two threaded shafts (12) are respectively fixedly connected to the two output ends of the double-output shaft motor (11). On the surfaces of the two threaded shafts (12), moving blocks (13) are threadedly connected.

3. A welding device for precision machining according to claim 2, characterized in that: On the tops of the two moving blocks (13), vertical rods (14) are fixedly installed. At the tops of the vertical rods (14), adjusting rods (15) are rotatably connected. At the bottoms of the first rotating seat (3) and the second rotating seat (4), push rods (16) are fixedly connected. Between the adjacent push rods (16) and the adjusting rods (15), rotational connections are provided.

4. A welding device for precision machining according to claim 1, characterized in that: The first adjustable fastening structure (8) includes an n-shaped plate (21) fixedly installed in the middle of the top of the first rotating seat (3). At the top inside the n-shaped plate (21), a second groove (22) is provided. Inside the second groove (22), a slide rod (23) is fixedly installed. On the surface of the slide rod (23), two second sliders (24) and two second sliders (25) are movably sleeved. The two second sliders (25) are located between the two first sliders (24). At both ends of the bottoms of the two second sliders (25), extrusion arms (26) are rotatably connected. Between the bottoms of the four extrusion arms (26), a first pressing plate (27) with telescopic adjustment is installed.

5. A welding device for precision machining according to claim 4, characterized in that: In the middle of the slide rod (23), a first spring (28) is sleeved. The two ends of the first spring (28) are respectively fixedly connected to the two second sliders B (25). At the lower parts of the two first sliders (24), T-shaped rods (29) are movably inserted. The opposite ends of the two T-shaped rods (29) are respectively fixedly connected to the two second sliders (25). On the surfaces of the two T-shaped rods (29), second springs (30) are sleeved. The two ends of the second springs (30) are respectively fixedly connected to the first sliders (24) and the second sliders (25).

6. The welding device for precision machining according to claim 5, characterized in that: Two third grooves (31) are symmetrically formed in the middle of the top of the first rotating seat (3). A bidirectional threaded shaft (32) is rotatably installed between the interiors of the two third grooves (31). Moving plates (33) are respectively threadedly connected to the surfaces of the bidirectional threaded shaft (32) located inside the two third grooves (31). Linking plates (34) are respectively rotatably connected between the tops of the two moving plates (33) and the bottoms of the two first sliders (24).

7. The welding device for precision machining according to claim 6, wherein: One end of the bidirectional threaded shaft (32) extends outside one side of the first rotating seat (3) and is fixedly connected to a transmission gear (35). A vertical plate (36) is fixedly installed on the top of the base (1). A semi-circular toothed plate (37) is fixedly installed on one side of the upper part of the vertical plate (36). The moving track of the semi-circular toothed plate (37) matches that of the transmission gear (35), and the transmission gear (35) is meshed and connected with the semi-circular toothed plate (37).

8. A welding device for precision machining according to claim 7, characterized in that: First ball grooves (39) are equidistantly formed on both sides of the bottom of the first pressing plate (27). First balls (40) are installed inside the first ball grooves (39). The first balls (40) are in contact with the surface of the first circular tube (6). First inclined holes (41) are respectively formed inside the first ball grooves (39). Third springs (42) are installed at the tops of the first inclined holes (41). First arc-shaped abutting blocks (43) that match and contact the first balls (40) are fixedly installed at the ends of the third springs (42) located inside the first ball grooves (39).

9. A welding device for precision machining according to claim 1, characterized in that: The second adjustable fastening structure (9) includes a second pressing plate (44). Second ball grooves (45) are equidistantly formed on both sides of the bottom of the first pressing plate (27). Second balls (46) are installed inside the second ball grooves (45). The second balls (46) are in contact with the surface of the second circular tube (7). Second inclined holes (47) are respectively formed inside the second ball grooves (45). Fourth springs (48) are installed at the tops of the second inclined holes (47). Second arc-shaped abutting blocks (49) that match and contact the second balls (46) are fixedly installed at the ends of the fourth springs (48) located inside the second ball grooves (45). A rotating plate (50) is fixedly installed on one side of the second pressing plate (44).

10. A welding device for precision machining according to claim 9, characterized in that: Two fixing blocks (51) are fixedly installed on the top of the second rotating seat (4). A rotating shaft (52) is rotatably connected between the upper parts of the two fixing blocks (51). One side of the rotating plate (50) is fixedly connected to the rotating shaft (52). One end of the rotating shaft (52) extends outside one side of one of the fixing blocks (51) and is fixedly installed with a worm gear (53). A worm (54) meshed with the worm gear (53) is rotatably installed on one side of one of the fixing blocks (51). An adjusting wheel (55) is fixedly installed on the top of the worm (54).

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