A quick fixing device for laser welding of pipe fittings

Abstract

The present invention relates to the technical field of welding devices, specifically a quick-fixing device for laser welding of pipe fittings. It comprises a base frame, a welding system is mounted on the base frame, a movable material rack is mounted on the base frame, a transmission wheel driven by a first motor is rotatably mounted on the material rack, three empty tooth portions and three toothed portions are alternately arranged on the transmission wheel, a reciprocating pressure frame is slidably mounted on the material rack, a toothed plate is mounted on the reciprocating pressure frame, the transmission stroke of the toothed plate by the three toothed portions increases in the counterclockwise direction, and a group of first elastic reset parts are mounted between the reciprocating pressure frame and the material rack. The beneficial effects of the present invention are as follows: the present invention solves the problems of non-adjustable fixation, precision affected by thermal deformation, poor adaptability, and low continuous operation efficiency of traditional devices through innovative designs of progressive pressure compensation, multi-station collaborative operation, adjustable clamp arm spacing, and multi-system linkage, thereby achieving rapid, precise fixation and efficient welding of pipe fittings of multiple specifications, and significantly improving welding quality and production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of welding devices, in particular to a quick fixing device for laser welding of pipe fittings. Background Art

[0002] In the field of mechanical manufacturing, oil pipes are crucial components in automobiles, engineering machinery and other equipment. Their performance directly affects the operation of the equipment's lubrication system. Oil pipes are usually welded together by components such as liner cores and joint rings. The quality of welding plays a decisive role in the sealing, strength and other properties of the oil pipes. Laser welding, as a high-precision and high-efficiency welding technology, has been widely used in the welding of oil pipe liner cores and joint rings due to its advantages such as small heat-affected zone, small welding deformation and fast welding speed.

[0003] During the laser welding process, the fixation of pipe fittings is a key step in ensuring welding quality. Only by accurately and stably fixing the oil pipe liner and the joint ring in the welding position can the laser beam be accurately irradiated to the welding area, thereby forming a high-quality weld. If the performance of the fixing device is poor, the pipe fitting may be displaced, vibrated or deformed during the welding process, thereby affecting the welding accuracy and quality, and even causing welding failure. In the prior art, various types of welding devices have appeared, but the existing welding devices have the following technical problems when used:

[0004] During the laser welding process, existing welding devices cause thermal deformation of pipe fittings due to local high temperatures. The existing devices lack an effective dynamic compensation mechanism, resulting in the relative position of the welded girth seam and the laser beam being offset, resulting in weld dislocation and uneven penetration. In addition, the loading, welding, and unloading processes of existing devices are scattered and rely on manual or intermittent operation at a single workstation. They lack an automated flow mechanism and cannot achieve continuous processing of multiple pipe fittings. The production cycle is long and the efficiency is low. After welding, the finished product needs to be removed manually, which not only increases labor intensity but may also damage the weld due to improper operation. It cannot be seamlessly connected with subsequent processes, affecting the continuity of the overall production process.

[0005] Based on this, the present invention provides a quick fixing device for laser welding of pipe fittings to solve the problems raised in the above background technology. Summary of the Invention

[0006] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a quick fixing device for laser welding of pipes.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is: a quick fixing device for laser welding of pipe fittings, comprising a chassis, a seat frame is fixedly mounted on the upper end of the chassis, a movable material rack is mounted on the seat frame, a transmission wheel driven by a first motor is rotatably mounted on the material rack, three empty tooth portions and three toothed portions are alternately arranged on the transmission wheel, a reciprocating pressure frame is slidably mounted on the material rack, a toothed plate is mounted on the reciprocating pressure frame, and the transmission stroke of the toothed plate by the three toothed portions increases progressively in the counterclockwise direction, a group of first elastic reset members is mounted between the reciprocating pressure frame and the material rack, the reciprocating pressure frame is connected to a compensation frame via a group of second elastic reset members, a supporting frame is mounted on the compensation frame and is provided with two clamping arms with adjustable spacing, two rollers are rotatably mounted on the supporting frame, the rollers are linked to the transmission wheel, and clamping rollers are rotatably mounted on the two clamping arms;

[0008] A pressure cylinder is installed on the seat frame, an indexing shell driven by a second motor is installed on the pressure cylinder, a plurality of clamping modules are provided on the indexing shell, and a missing bevel gear ring is provided on the pressure cylinder;

[0009] The clamping module includes a reciprocating screw rotatably connected to the indexing shell and a positioning tube fixedly installed on the indexing shell. The reciprocating screw is provided with a driven bevel gear that meshes with the missing bevel gear ring. A torsion spring is provided at the rotating connection between the reciprocating screw and the indexing shell. A blanking push plate that is slidably connected to the positioning tube is installed on the reciprocating screw. A clamping tube is rotatably installed on the positioning tube. A ring clamp bag is provided on the clamping tube. A pressure regulating component for controlling the pressure of the ring clamp bag is provided on the pressure cylinder.

[0010] As a preferred technical solution of the present invention, a linear transmission module is installed on the chassis, and the linear transmission module is connected to the material rack transmission. A central control panel is installed on the end face of the chassis, and a material receiving box with a top opening is connected to the chassis. A loading area is provided on the chassis at a position corresponding to the central control panel, a unloading area is provided at a position corresponding to the material receiving box, and a welding area is provided at a position corresponding to the support frame, and the conical gear ring is arranged on the unloading area.

[0011] As a preferred technical solution of the present invention, an outer bushing and a differential shaft are rotatably installed on the material rack, an inner shaft is fixedly installed on one of the rollers, a connecting groove with an opening at the tail end fixedly opened inside the outer bushing and slidingly connected to the inner shaft, the cross-sections of the connecting groove and the inner shaft are both regular hexagons, a synchronous toothed belt is connected for transmission between the outer bushing and the differential shaft, a differential bevel gear is installed on the differential shaft and the transmission wheel, and the two differential bevel gears are orthogonally meshed.

[0012] As a preferred technical solution of the present invention, an adjusting motor is fixedly installed on the compensation frame and a bidirectional screw is rotatably installed. The output shaft end of the adjusting motor is fixedly connected to the bidirectional screw. A positive thread segment and a negative thread segment are respectively provided on the bidirectional screw. The positive thread segment and the negative thread segment are respectively connected to the two clamping arms in a transmission manner. Both of the clamping arms are slidably connected to the compensation frame.

[0013] As a preferred technical solution of the present invention, the first elastic return member and the second elastic return member both include a T-shaped guide rod and a return spring sleeved on the T-shaped guide rod, the T-shaped guide rod in the first elastic return member is fixedly mounted on the material rack, and the first elastic return member is slidably connected to the reciprocating pressure frame, the return spring in the first elastic return member is arranged between the material rack and the reciprocating pressure frame, the T-shaped guide rod in the second elastic return member is fixedly mounted on the compensation frame, and is slidably connected to the reciprocating pressure frame, and the return spring in the second elastic return member is arranged between the reciprocating pressure frame and the compensation frame.

[0014] As a preferred technical solution of the present invention, a welding system is installed on the seat frame, and the welding system includes a hanger installed on the seat frame, a vertically arranged screw lifting module is installed on the hanger, and a laser welder is installed on the screw lifting module. A welding gun is provided at the bottom end of the laser welder, and the welding gun is set at 45°.

[0015] As a preferred technical solution of the present invention, the pressure regulating assembly includes an air pump installed on a hanger, a pressure relief open section is provided on the pressure cylinder at a position corresponding to the unloading area, and a pressure charging chamber is provided at a position corresponding to the welding area, the port of the air pump is connected to the pressure charging chamber through an air pipe, and an air pressure probe and a pressure relief valve are respectively installed on the air pipe, and the data ends of the air pressure probe and the pressure relief valve are connected to the data of the central control panel, the interior of the reciprocating screw is fixed with a flow channel with openings at both ends and connected to the indexing shell, and a pressure charging hole connected to the pressure charging chamber is provided on the pressure charging chamber at a position corresponding to the welding area, the front end of the flow channel is connected to the inner cavity of the ring clamp bag, and the tail end thereof is connected to the pressure charging hole in the welding area.

[0016] As a preferred technical solution of the present invention, two symmetrically arranged electric heating plates are installed on the positioning tube, and two symmetrically arranged guide grooves are provided on the positioning tube and are slidably connected to the unloading push plate, and a follower push frame is rotatably installed on the unloading push plate.

[0017] As a preferred technical solution of the present invention, an oil pipe lining core is fixedly installed on the outside of the ring clamp bag, a joint ring is provided on the oil pipe lining core, and a ring seam to be welded is provided between the joint ring and the oil pipe lining core. The inner diameter of the oil pipe lining core is adapted to the outer diameter of the positioning tube and is sleeved on the positioning tube after loading.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention realizes progressive pressure adjustment of the joint ring by meshing the three toothed portions alternately arranged on the transmission wheel with the tooth plate, and adopts a design in which the transmission stroke increases in the rotation direction, and cooperates with the elastic buffering of the first elastic return member and the second elastic return member. The traditional device has no adjustable pressure or the adjustment is cumbersome, and cannot adapt to joint rings of different wall thicknesses and materials. In addition, the thermal deformation of welding can easily cause the joint ring to move or loosen. The present invention can dynamically adjust the pressure according to the welding requirements, which can not only adapt to the fixing requirements of various types of joint rings, but also offset the thermal deformation of welding through pressure compensation, so that the oil pipe liner core and the joint ring always maintain a close fit, solving the problem of reduced welding accuracy due to loose fixation or thermal deformation.

[0020] 2. The present invention drives the indexing shell to rotate step by step through the second motor, driving multiple clamping modules to pass through the loading area, welding area, and unloading area in turn, forming a "loading, welding and unloading" cycle operation chain. The loading, welding and unloading areas of traditional devices are chaotic, the degree of automation is low, and the continuous operation efficiency of multiple pipes is low. The present invention realizes multi-station coordination through the circular motion of the indexing shell, and the ring clamp bag is quickly pressurized and fixed and released, and the unloading push plate is used for automatic unloading, so that the device can continuously complete the welding and fixation of multiple batches of pipes. The operating efficiency is improved compared with traditional devices, fully reflecting the core advantage of "quick fixation".

[0021] 3. In the present invention, the linear transmission module of the material rack, the rotary drive of the roller and the screw lifting module of the laser welder form a coordinated control: the precise movement of the material rack ensures the alignment of the support frame and the clamping module, the roller drives the joint ring and the oil pipe liner core to rotate synchronously at a constant speed, and the welding gun height and 45° angle are adjusted synchronously to ensure that the laser beam is always aligned with the circumferential seam to be welded. The traditional device is prone to uneven welds due to the lack of coordination between the rotation of the joint ring and the alignment of the welding gun. The present invention achieves all-round and uniform coverage of circumferential seam welding through multi-system linkage, and significantly improves the welding quality.

[0022] 4. In the present invention, the pressure regulating assembly uses the pressure charging chamber and the pressure relief open section to directionally pressurize the ring clamp bag in the welding area and directionally release the pressure in the blanking area. In conjunction with the real-time adjustment of the air pressure probe and the pressure relief valve, the clamping force can be accurately controlled according to the material and wall thickness of the oil pipe liner to avoid excessive clamping or loose fixation. At the same time, the electric heating plate on the positioning tube preheats the oil pipe liner to reduce welding temperature stress. The guide groove design of the blanking push plate ensures smooth blanking. The traditional device has rough pressure control of the ring clamp bag and lacks preheating treatment, which can easily lead to weld cracking or blanking deviation. The present invention uses the above design to improve welding strength and reduce blanking damage rate, fully meeting the requirements of precision processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of a material receiving box and an air pump of a quick fixing device for laser welding of pipe fittings;

[0024] Figure 2 A quick fixing device for laser welding of pipe fittings Figure 1 Schematic diagram of the local enlarged structure at A in the middle;

[0025] Figure 3 This is a structural diagram of a screw lifting module and a material rack of a quick fixing device for laser welding of pipe fittings;

[0026] Figure 4 A quick fixing device for laser welding of pipe fittings Figure 3 Schematic diagram of the local enlarged structure at B in the middle;

[0027] Figure 5 A quick fixing device for laser welding of pipe fittings Figure 3 Schematic diagram of the local enlarged structure at C in the middle;

[0028] Figure 6 This is a schematic diagram of the structure of an air pump and a chassis of a quick-fix device for laser welding of pipes;

[0029] Figure 7 This is a structural diagram of a material rack and compensation rack of a quick fixing device for laser welding of pipe fittings;

[0030] Figure 8 A quick fixing device for laser welding of pipe fittings Figure 7 Schematic diagram of the local enlarged structure at D in the middle;

[0031] Figure 9 This is a schematic diagram of the exploded structure of an oil pipe liner and a compensation frame of a quick-fix laser welding device for pipe fittings;

[0032] Figure 10 A schematic diagram of the structure of a driven bevel gear and a positioning tube of a quick fixing device for laser welding of pipe fittings;

[0033] Figure 11 This is a schematic diagram of the bidirectional screw structure of a quick fixing device for laser welding of pipe fittings.

[0034] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0035] 1. Base frame; 2. Material rack; 3. First motor; 4. Drive wheel; 5. Empty tooth portion; 6. Toothed portion; 7. Reciprocating press frame; 8. Tooth plate; 9. First elastic reset member; 10. Second elastic reset member; 11. Compensating frame; 12. Support frame; 13. Clamping arm; 14. Support roller; 15. Clamping roller; 16. Pressurizing cylinder; 17. Second motor; 18. Indexing housing; 19. Missing bevel gear ring; 20. Reciprocating screw; 21. Positioning tube; 22. Driven bevel gear; 23. Torsion spring; 24 , blanking push plate; 25, pipe clamp; 26, ring clamp bag; 27, chassis; 28, linear transmission module; 29, central control panel; 30, material receiving box; 31, differential shaft; 32, inner shaft; 33, bidirectional screw; 34, bracket; 35, screw lifting module; 36, laser welder; 37, air pump; 38, pressure relief open section; 39, charging chamber; 40, charging hole; 41, electric heating plate; 42, oil pipe liner core; 43, joint ring; 44, follow-up push frame; 45, outer sleeve. DETAILED DESCRIPTION

[0036] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0037] like Figure 1-11 As shown, a quick fixing device for laser welding of pipe fittings comprises a chassis 27, a seat frame 1 is fixedly mounted on the upper end of the chassis 27, a movable material rack 2 is mounted on the seat frame 1, a transmission wheel 4 driven by a first motor 3 is rotatably mounted on the material rack 2, three empty tooth portions 5 and three toothed portions 6 are alternately arranged on the transmission wheel 4, a reciprocating pressing frame 7 is slidably mounted on the material rack 2, a toothed plate 8 is mounted on the reciprocating pressing frame 7, and the transmission stroke of the three toothed portions 6 to the toothed plate 8 increases in the counterclockwise direction, a group of first elastic reset members 9 is mounted between the reciprocating pressing frame 7 and the material rack 2, a compensation frame 11 is connected to the reciprocating pressing frame 7 through a group of second elastic reset members 10, a supporting frame 12 is mounted on the compensation frame 11 and is provided with two clamping arms 13 with adjustable spacing, two rollers 14 are rotatably mounted on the supporting frame 12, the rollers 14 are linked to the transmission wheel 4, and clamping rollers 15 are rotatably mounted on both clamping arms 13;

[0038] A pressure cylinder 16 is mounted on the seat frame 1, and an indexing housing 18 driven by a second motor 17 is mounted on the pressure cylinder 16. The indexing housing 18 is provided with a plurality of clamping modules, and a missing bevel gear ring 19 is provided on the pressure cylinder 16.

[0039] The clamping module includes a reciprocating screw 20 rotatably connected to the indexing shell 18 and a positioning tube 21 fixedly installed on the indexing shell 18. The reciprocating screw 20 is provided with a driven bevel gear 22 that is adapted to mesh with the missing bevel gear ring 19. A torsion spring 23 is provided at the rotating connection between the reciprocating screw 20 and the indexing shell 18. A blanking push plate 24 that is slidably connected to the positioning tube 21 is transmission-installed on the reciprocating screw 20. A clamping tube 25 is rotatably installed on the positioning tube 21. A ring clamp bag 26 is provided on the clamping tube 25. A pressure regulating component for controlling the pressure of the ring clamp bag 26 is provided on the pressure cylinder 16.

[0040] A linear transmission module 28 is installed on the chassis 27, and the linear transmission module 28 is connected to the material rack 2 for transmission. A central control panel 29 is installed on the end face of the chassis 27, and a material receiving box 30 with a top opening is connected to the chassis 27. A loading area is provided on the chassis 27 at a position corresponding to the central control panel 29, a unloading area is provided at a position corresponding to the material receiving box 30, and a welding area is provided at a position corresponding to the support frame 12, and the bevel gear ring 19 is arranged on the unloading area.

[0041] An outer sleeve 45 and a differential shaft 31 are rotatably mounted on the material rack 2, and an inner shaft 32 is fixedly mounted on a roller 14. A coupling groove with an opening at the tail end and slidingly connected to the inner shaft 32 is fixedly opened inside the outer sleeve 45. The cross-sections of the coupling groove and the inner shaft 32 are both regular hexagons. A synchronous toothed belt is connected between the outer sleeve 45 and the differential shaft 31. A differential bevel gear is installed on the differential shaft 31 and the transmission wheel 4, and the two differential bevel gears are orthogonally meshed.

[0042] The principle of increasing the transmission stroke of the three toothed portions 6 to the toothed plate 8 in the counterclockwise direction is as follows:

[0043] The center angles corresponding to the effective meshing tooth segments on the three toothed parts 6 in the counterclockwise direction are 40°, 60°, and 80°, respectively. The number of teeth on the effective meshing tooth segments on the three toothed parts 6 increases, and the tooth pitches on the effective meshing tooth segments on the three toothed parts 6 are the same.

[0044] The larger the center angle, the longer the contact time between the toothed portion 6 and the toothed plate 8, thereby increasing the stroke of the reciprocating press frame 7;

[0045] The central angles corresponding to the three empty tooth portions 5 are the same;

[0046] The first elastic return member 9 and the second elastic return member 10 have different return spring elastic coefficients to form progressive pressure compensation to offset the displacement caused by welding thermal deformation.

[0047] During operation, the first motor 3 drives the transmission wheel 4 to rotate, and the three toothed portions 6 engage with the tooth plate 8 in sequence. Due to the different effective meshing tooth segments, the transmission stroke of the reciprocating pressure frame 7 is gradually increased, thereby adjusting the pressure on the compensation frame 11. When the transmission wheel 4 rotates to the empty tooth portion 5, the return spring of the first elastic return member 9 drives the reciprocating pressure frame 7 to reset;

[0048] On the one hand, this solution solves the problem that the pressure of the traditional fixing device is not adjustable or the adjustment is cumbersome, and it cannot adapt to the fixing requirements of the joint ring 43 with different wall thickness and different materials;

[0049] On the other hand, the pressure compensation structure can solve the problem of thermal deformation caused by welding the oil pipe liner core 42 and the joint ring 43;

[0050] The progressive pressure compensation structure ensures that the oil pipe liner core 42 and the joint ring 43 can always maintain close contact during the welding process, thereby ensuring welding accuracy;

[0051] The compensation frame 11 is provided with a support frame 12 and two clamping arms 13 with adjustable spacing. Two rollers 14 are rotatably mounted on the support frame 12. The rollers 14 are linked to the transmission wheel 4. Clamping rollers 15 are rotatably mounted on the two clamping arms 13.

[0052] An adjusting motor is fixedly mounted on the compensation frame 11 and a bidirectional screw rod 33 is rotatably mounted thereon. The output shaft end of the adjusting motor is fixedly connected to the bidirectional screw rod 33. The bidirectional screw rod 33 is provided with a positive thread segment and a negative thread segment, respectively. The positive thread segment and the negative thread segment are respectively connected to the two clamping arms 13 in a transmission manner. Both clamping arms 13 are slidably connected to the compensation frame 11.

[0053] During operation, the regulating motor drives the bidirectional screw 33 to rotate, and its positive thread segment and reverse thread segment respectively drive the two clamping arms 13 to slide relative to or away from each other. The bidirectional screw 33 converts the rotational motion into the linear motion of the clamping arms 13 through the reverse spiral design of the positive thread segment and the reverse thread segment.

[0054] The specific working process is as follows: after the regulating motor is started, its output shaft drives the bidirectional screw 33 to rotate clockwise or counterclockwise around its own axis;

[0055] The positive thread segment, such as a right-hand thread, cooperates with the threaded hole of one clamping arm 13, and the negative thread segment, such as a left-hand thread, cooperates with the threaded hole of the other clamping arm 13. When the screw rotates clockwise, the positive thread segment generates an axial thrust to the left on the corresponding clamping arm, and the negative thread segment generates an axial thrust to the right on the other clamping arm. Conversely, when the screw rotates counterclockwise, the thrust direction is reversed;

[0056] Since the clamping arm 13 is slidably connected to the compensation frame 11 through a slider or a slot, this constraint limits the freedom of the clamping arm to rotate with the screw, so that it can only slide linearly along the axial direction of the screw;

[0057] Therefore, when the screw rotates clockwise, the two clamping arms slide relative to each other under the action of reverse thrust, realizing the "clamping" action of reducing the distance; when the screw rotates counterclockwise, the clamping arms slide away from each other under the action of reverse thrust, realizing the "loosening" action of increasing the distance.

[0058] The spacing can be quickly adjusted, and the clamping rollers 15 and the supporting rollers 14 cooperate to fix the joint ring 43 from both sides and the bottom. This solution solves the problem that the traditional clamping arms 13 are fixed in spacing and can only adapt to a single specification of joint ring 43, resulting in poor versatility.

[0059] The spacing between the clamping arms 13 is easily and accurately adjusted through the bidirectional screw 33, allowing for rapid clamping of joint rings 43 of varying diameters. During welding, the clamping rollers 15 drive the joint ring 43 and the oil pipe liner core 42 to rotate synchronously at a set speed, thereby achieving uniform, all-around welding of the weld.

[0060] When the joint ring 43 is placed in the support frame 12, the material rack 2 is sufficiently away from the indexing shell 18, and the spacing between the clamping rollers 15 is expanded to the maximum;

[0061] When the material rack 2 moves toward the indexing housing 18, the two clamping rollers 15 complete the positioning, clamping and limiting of the butt joint ring 43;

[0062] The first elastic return member 9 and the second elastic return member 10 both include a T-shaped guide rod and a return spring sleeved on the T-shaped guide rod. The T-shaped guide rod in the first elastic return member 9 is fixedly mounted on the material rack 2, and the first elastic return member 9 is slidingly connected to the reciprocating pressure frame 7. The return spring in the first elastic return member 9 is arranged between the material rack 2 and the reciprocating pressure frame 7. The T-shaped guide rod in the second elastic return member 10 is fixedly mounted on the compensation frame 11 and is slidingly connected to the reciprocating pressure frame 7. The return spring in the second elastic return member 10 is arranged between the reciprocating pressure frame 7 and the compensation frame 11.

[0063] During operation, the T-shaped guide rod provides precise guidance for the sliding of the reciprocating pressure frame 7 and the compensation frame 11 to avoid offset and jamming. When the reciprocating pressure frame 7 and the compensation frame 11 are forced to move, the elastic force of the reset spring drives the two to reset quickly. This solution solves the problems of poor guidance and slow reset of the traditional reset structure. The cooperation of the T-shaped guide rod and the reset spring makes the reciprocating motion smoother and the reset faster, reducing mechanical loss, ensuring the consistency of the fixed action during the laser welding of the joint ring 43, and improving the operating efficiency and service life of the device.

[0064] An outer sleeve 45 and a differential shaft 31 are rotatably mounted on the rack 2, and an inner shaft 32 is fixedly mounted on the roller 14 linked to the transmission wheel 4. A coupling groove with an opening at the tail end and slidingly connected to the inner shaft 32 is fixedly opened inside the outer sleeve 45. The cross-sections of the coupling groove and the inner shaft 32 are both regular hexagonal. A synchronous toothed belt is connected between the outer sleeve 45 and the differential shaft 31. A differential bevel gear is installed on both the differential shaft 31 and the transmission wheel 4, and the two differential bevel gears are orthogonally meshed.

[0065] The above structure realizes stable transmission of the roller 14 during axial movement, ensuring uniform rotation of the joint ring 43 during welding. During operation, the transmission wheel 4 drives the differential shaft 31 to rotate through the differential bevel gear, and drives the outer sleeve 45 through the synchronous toothed belt. The regular hexagonal coupling groove of the outer sleeve 45 slides with the inner shaft 32 of the roller 14. When the roller 14 moves axially with the compensation frame 11, the torque can still be transmitted through the meshing of the coupling groove and the inner shaft 32, thereby driving the roller 14 to rotate.

[0066] A pressure cylinder 16 is mounted on the seat frame 1, on which an indexing housing 18 driven by a second motor 17 is rotatably mounted. The indexing housing 18 is provided with a plurality of clamping modules arranged in a circumferential array. A bevel gear ring 19 is provided on the pressure cylinder 16.

[0067] A material receiving box 30 with an opening at the top is connected to the chassis 27. A loading area is provided on the chassis 27 at a position corresponding to the central control panel 29, a unloading area is provided at a position corresponding to the material receiving box 30, and a welding area is provided at a position corresponding to the support frame 12. The bevel gear ring 19 is provided on the unloading area.

[0068] The loading area completes the loading of the oil pipe liner core 42, the welding area performs laser welding, and the unloading area completes the unloading through the missing bevel gear ring 19. Finally, the finished product falls into the receiving box 30. This solution solves the problems of the traditional device's chaotic loading, welding, and unloading areas, low degree of automation, and poor operation continuity.

[0069] The clamping module includes a reciprocating screw 20 rotatably connected to the indexing housing 18 and a positioning tube 21 fixedly mounted on the indexing housing 18. The positioning tube 21 is coaxially arranged with the reciprocating screw 20 and is arranged on the outside of the reciprocating screw 20.

[0070] The reciprocating screw 20 is provided with a driven bevel gear 22 that meshes with the missing bevel gear ring 19. A torsion spring 23 is provided at the rotating connection between the reciprocating screw 20 and the indexing shell 18. A blanking push plate 24 is installed on the reciprocating screw 20 for transmission. The blanking push plate 24 is slidably connected to the positioning tube 21. A clamping tube 25 is rotatably installed on the positioning tube 21. The clamping tube 25 is provided with a ring clamp bag 26. The pressure cylinder 16 is provided with a pressure regulating component for controlling the pressure of the ring clamp bag 26.

[0071] A welding system is installed at the upper end of the seat frame 1. The welding system includes a hanger 34 installed on the seat frame 1. A vertical screw lifting module 35 is installed on the hanger 34. A laser welder 36 is installed on the screw lifting module 35. A welding gun is provided at the bottom end of the laser welder 36. The welding gun is set at 45 degrees.

[0072] When the welding system is working, the screw lifting module 35 can drive the laser welder 36 to move flexibly in the vertical direction, and quickly adjust the height of the welding gun to meet the welding requirements of different specifications of the joint ring 43 and the oil pipe liner 42. The welding gun set at 45° can accurately align the circumferential seam to be welded between the joint ring 43 and the oil pipe liner 42, ensuring that the laser beam maintains the optimal welding angle with the circumferential seam.

[0073] The pressure regulating assembly includes an air pump 37 mounted on a bracket 34. A pressure relief opening 38 is provided on the pressure cylinder 16 at a position corresponding to the blanking area, and a pressure chamber 39 is provided at a position corresponding to the welding area. The port of the air pump 37 is connected to the pressure chamber 39 through an air pipe. An air pressure probe and a pressure relief valve are respectively installed on the air pipe. The signal output ends of the air pressure probe and the pressure relief valve are both communicatively connected to the data interface of the central control panel 29.

[0074] The air pressure probe is a digital pressure sensor, and its data terminal is connected to the central control panel 29 to monitor the air pressure in the charging chamber 39 in real time;

[0075] A flow channel with openings at both ends and connected to the indexing shell 18 is fixedly provided inside the reciprocating screw rod 20. A charging hole 40 connected to the charging chamber 39 is provided on the charging chamber 39 at a position corresponding to the welding area. The front end of the flow channel is connected to the inner cavity of the ring clamp bag 26, and its tail end is connected to the charging hole 40 in the welding area.

[0076] During operation, in the welding area, the air pump 37 supplies air to the pressure chamber 39 through the air pipe, the air pressure probe monitors the pressure, the central control panel 29 controls the pressure relief valve to adjust the pressure, and the pressure hole 40 is connected to the flow channel of the reciprocating screw 20, and the ring clamp bag 26 is pressurized to expand and fix the oil pipe liner 42, thereby ensuring the stability and welding accuracy of the oil pipe liner 42 during welding;

[0077] In the unloading area, the flow channel is connected to the pressure relief opening section 38, the ring clamp bag 26 contracts to release the oil pipe liner core 42, the missing bevel gear ring 19 engages with the driven bevel gear 22, and the reciprocating screw 20 rotates to drive the unloading push plate 24 to push the oil pipe liner core 42 and the joint ring 43 to the receiving box 30. After leaving the unloading area, under the reset action of the torsion spring 23, the reciprocating screw 20 and the unloading push plate 24 automatically reset;

[0078] This solution solves the problem of inaccurate pressure control of the traditional ring clamp bag 26, which leads to loose fixation or excessive clamping damage to the oil pipe liner core 42 and the joint ring 43. Through precise control of the pressure regulating component, the clamping force can be adjusted according to the material and wall thickness of the oil pipe liner core 42, ensuring stable fixation during welding while preventing damage to the oil pipe liner core 42, thereby improving the reliability of fixation and adaptability to different oil pipe liner cores 42.

[0079] During operation, the second motor 17 drives the indexing shell 18 to rotate stepwise at a set interval period, driving multiple clamping modules to pass through the loading area, welding area, and unloading area in sequence. This solution solves the problems of low automation level in clamping and unloading of traditional devices and low efficiency of continuous operation of multiple oil pipe liner cores 42. The circular motion of the indexing shell 18 realizes multi-station coordination, and the ring clamp capsule 26 quickly pressurizes and fixes and releases the pressure, and cooperates with the unloading push plate 24 to automatically unload, which greatly improves the automation level and operation efficiency during laser welding of the oil pipe liner core 42 and the joint ring 43, highlighting the core advantage of "quick fixation";

[0080] The loading area, welding area, and unloading area are sequentially arranged along the circumferential direction of the indexing shell 18;

[0081] In the loading area, the device is equipped with a six-axis robot arm, which sleeves the oil pipe liner core 42 onto the positioning tube 21. In the welding area, the oil pipe liner core 42 is positioned and the joint ring 43 is sleeved onto the oil pipe liner core 42.

[0082] Subsequently, the laser welder 36 performs the laser welding operation. After the welding is completed, the clamping roller 15 loses the clamping of the joint ring 43, and as the indexing shell 18 rotates, the unloading operation can be completed in the unloading area.

[0083] Two symmetrically arranged electric heating plates 41 are installed on the positioning tube 21. Two symmetrically arranged guide grooves are provided on the positioning tube 21 and are slidably connected to the blanking push plate 24. A follower push frame 44 is rotatably installed on the blanking push plate 24.

[0084] During operation, the electric heating plate 41 on the positioning tube 21 preheats the sleeved oil pipe liner 42, reducing the temperature stress during welding and preventing weld cracking. The guide groove guides the blanking push plate 24 to slide smoothly along the positioning tube 21, ensuring accurate blanking position. This solution solves the problems of insufficient welding strength between the oil pipe liner 42 and the joint ring 43 due to temperature stress in traditional welding, and damage to the joint ring 43 and the oil pipe liner 42 caused by sliding and offsetting of the blanking push plate 24.

[0085] The preheat treatment enhances weld strength, and the guide groove ensures stable material removal, improving product quality and material removal efficiency. This meets the precision machining requirements of laser welding of the joint ring 43 and the oil pipe liner core 42.

[0086] An oil pipe lining core 42 is fixedly installed on the outside of the ring clamp bag 26. A joint ring 43 is provided on the oil pipe lining core 42. A ring seam to be welded is provided between the joint ring 43 and the oil pipe lining core 42. The inner diameter of the oil pipe lining core 42 is adapted to the outer diameter of the positioning tube 21 and is sleeved on the positioning tube 21 after loading.

[0087] During operation, the inner diameter of the oil pipe liner 42 is adapted to the positioning tube 21, and can be stably fixed after being put on. The joint ring 43 is put on the oil pipe liner 42 to form a ring seam to be welded. The fixed structure of the device can accurately clamp the two to ensure that the ring seam is aligned with the welding gun. This solution solves the problem of inaccurate positioning when welding the oil pipe liner 42 and the joint ring 43, resulting in ring seam offset and poor welding quality. Through size adaptation design, fast and accurate positioning of the parts to be welded is achieved, the accuracy of laser welding is improved, and the device is more suitable for batch welding operations of the oil pipe liner 42, thereby enhancing the practicality of the device.

[0088] Working principle:

[0089] The present invention is controlled by the central control panel 29 as a whole. The loading area sleeves the oil pipe liner core 42 on the positioning tube 21 through the six-axis robot arm. The second motor 17 drives the indexing shell 18 to rotate in steps, driving the clamping modules to enter the welding area in sequence; at this time, the linear transmission module 28 drives the material rack 2 to move to the welding area, and the adjustment motor drives the bidirectional screw 33 to adjust the spacing of the clamping arms 13, so that the clamping roller 15 cooperates with the roller 14 on the support frame 12 to clamp the joint ring 43, and the first motor 3 drives the transmission wheel 4 to rotate. Its three toothed parts 6 are engaged with the gear plate 8, and the compensation frame 11 is driven by the reciprocating pressure frame 7 and the second elastic reset member 10 to realize progressive pressure compensation of the joint ring 43. At the same time, the transmission wheel 4 rotates through the differential bevel gear, the differential shaft 31, and the synchronous toothed belt to link the roller 14, so that the joint ring 43 and the oil pipe liner core 42 rotate synchronously and at a uniform speed;

[0090] In the welding system, the screw lifting module 35 adjusts the height of the laser welder 36, the 45-degree welding gun is aimed at the circumferential seam to be welded, and the joint ring 43 is rotated to complete the circumferential seam welding. During this process, the pressure regulating component of the pressure cylinder 16 pressurizes the ring clamp bag 26 through the pressure chamber 39 through the flow channel to fix the oil pipe liner core 42;

[0091] After welding is completed, the indexing shell 18 drives the clamping module into the unloading area, the ring clamp bag 26 is depressurized through the pressure relief opening section 38, the missing bevel gear ring 19 is engaged with the driven bevel gear 22, the reciprocating screw 20 rotates to drive the unloading push plate 24 to push the finished product into the receiving box 30, and then the torsion spring 23 resets the reciprocating screw 20;

[0092] The necessity of linkage between various systems is reflected in the coordination between the rack 2 transmission and the welding system;

[0093] The precise movement of the rack 2 ensures that the support frame 12 is aligned with the clamping module. The rotation of the roller 14 drives the joint ring 43 to rotate. At the same time, the height and angle of the welding gun are precisely adjusted. The three synchronized to ensure that the laser beam is always aligned with the weld seam, solving the problem of uneven welds caused by the mismatch between the rotation of the joint ring 43 and the alignment of the welding gun in traditional devices.

[0094] Ultimately, this invention solves the technical difficulties of the existing technology that cannot take into account the rapid adaptation and fixation of joint rings 43 of different specifications, compensation for welding thermal deformation, coordination of multi-station continuous operations, and precise alignment of circumferential seam welding through the automated linkage of various systems, thereby achieving efficient and high-precision laser welding and fixation of pipe fittings.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A quick fixing device for laser welding of pipe fittings, comprising a chassis (27), characterized in that: A seat frame (1) is fixedly mounted on the upper end of the chassis (27), a movable material rack (2) is mounted on the seat frame (1), a transmission wheel (4) driven by a first motor (3) is rotatably mounted on the material rack (2), three empty tooth portions (5) and three toothed portions (6) are alternately arranged on the transmission wheel (4), a reciprocating pressing frame (7) is slidably mounted on the material rack (2), a toothed plate (8) is mounted on the reciprocating pressing frame (7), and the transmission stroke of the three toothed portions (6) to the toothed plate (8) is transmitted in the counterclockwise direction. In addition, a group of first elastic reset members (9) are installed between the reciprocating pressing frame (7) and the material frame (2), a compensation frame (11) is connected to the reciprocating pressing frame (7) through a group of second elastic reset members (10), a support frame (12) is installed on the compensation frame (11) and is provided with two clamping arms (13) with adjustable spacing, two rollers (14) are rotatably installed on the support frame (12), the rollers (14) are linked to the transmission wheel (4), and clamping rollers (15) are rotatably installed on the two clamping arms (13); A pressure cylinder (16) is mounted on the seat frame (1), a shifting shell (18) driven by a second motor (17) is mounted on the pressure cylinder (16), a plurality of clamping modules are mounted on the shifting shell (18), and a missing bevel gear ring (19) is mounted on the pressure cylinder (16); The clamping module includes a reciprocating screw (20) rotatably connected to the indexing shell (18) and a positioning tube (21) fixedly installed on the indexing shell (18); the reciprocating screw (20) is provided with a driven bevel gear (22) adapted to mesh with the missing bevel gear ring (19); a torsion spring (23) is provided at the rotation connection between the reciprocating screw (20) and the indexing shell (18); a blanking push plate (24) slidably connected to the positioning tube (21) is transmission-mounted on the reciprocating screw (20); a clamping tube (25) is rotatably mounted on the positioning tube (21); a ring clamping bag (26) is provided on the clamping tube (25); and a pressure regulating assembly for controlling the pressure of the ring clamping bag (26) is provided on the pressure charging cylinder (16).

2. A quick fixing device for laser welding of pipes according to claim 1, characterized in that: A linear transmission module (28) is installed on the chassis (27), and the linear transmission module (28) is connected to the material rack (2). A central control panel (29) is installed on the end face of the chassis (27). A material receiving box (30) with an open top is connected to the chassis (27). A loading area is provided on the chassis (27) at a position corresponding to the central control panel (29), a unloading area is provided at a position corresponding to the material receiving box (30), and a welding area is provided at a position corresponding to the support frame (12). The conical gear ring (19) is provided on the unloading area.

3. A quick fixing device for laser welding of pipes according to claim 1, characterized in that: An outer shaft sleeve (45) and a differential shaft (31) are rotatably mounted on the material rack (2), an inner shaft (32) is fixedly mounted on one of the rollers (14), a coupling groove with a tail end opening fixedly opened inside the outer shaft sleeve (45) and slidably connected to the inner shaft (32), the cross sections of the coupling groove and the inner shaft (32) both being regular hexagons, a synchronous toothed belt being transmission-connected between the outer shaft sleeve (45) and the differential shaft (31), a differential bevel gear being mounted on each of the differential shaft (31) and the transmission wheel (4), and the two differential bevel gears being orthogonally meshed.

4. A quick fixing device for laser welding of pipes according to claim 1, characterized in that: An adjusting motor is fixedly mounted on the compensation frame (11) and a bidirectional screw rod (33) is rotatably mounted thereon. The output shaft end of the adjusting motor is fixedly connected to the bidirectional screw rod (33). A positive thread segment and a negative thread segment are respectively provided on the bidirectional screw rod (33). The positive thread segment and the negative thread segment are respectively transmission-connected to two clamping arms (13). Both of the two clamping arms (13) are slidably connected to the compensation frame (11).

5. The quick fixing device for laser welding of pipes according to claim 1, characterized in that: The first elastic return member (9) and the second elastic return member (10) both include a T-shaped guide rod and a return spring sleeved on the T-shaped guide rod. The T-shaped guide rod in the first elastic return member (9) is fixedly mounted on the material rack (2), and the first elastic return member (9) is slidably connected to the reciprocating pressure frame (7). The return spring in the first elastic return member (9) is arranged between the material rack (2) and the reciprocating pressure frame (7). The T-shaped guide rod in the second elastic return member (10) is fixedly mounted on the compensation frame (11) and slidably connected to the reciprocating pressure frame (7). The return spring in the second elastic return member (10) is arranged between the reciprocating pressure frame (7) and the compensation frame (11).

6. A quick fixing device for laser welding of pipes according to claim 1, characterized in that: A welding system is installed on the seat frame (1), and the welding system includes a hanging frame (34) installed on the seat frame (1), a vertically arranged screw lifting module (35) is installed on the hanging frame (34), a laser welder (36) is installed on the screw lifting module (35), and a welding gun is provided at the bottom end of the laser welder (36), and the welding gun is set at 45 degrees.

7. The quick fixing device for laser welding of pipes according to claim 1, characterized in that: The pressure regulating assembly includes an air pump (37) mounted on a hanger (34); a pressure relief opening section (38) is provided on the pressure cylinder (16) at a position corresponding to the unloading area; and a pressure chamber (39) is provided at a position corresponding to the welding area; a port of the air pump (37) is connected to the pressure chamber (39) through an air pipe; an air pressure probe and a pressure relief valve are respectively installed on the air pipe; the data ends of the air pressure probe and the pressure relief valve are both connected to the data of the central control panel (29); a flow channel with two ends opened and connected to the indexing shell (18) is fixedly provided inside the reciprocating screw (20); a pressure hole (40) connected to the pressure chamber (39) is provided on the pressure chamber (39) at a position corresponding to the welding area; the front end of the flow channel is connected to the inner cavity of the ring clamp bag (26), and the tail end thereof is connected to the pressure hole (40) in the welding area.

8. The quick fixing device for laser welding of pipes according to claim 1, characterized in that: Two symmetrically arranged electric heating plates (41) are installed on the positioning tube (21), and two symmetrically arranged guide grooves are provided on the positioning tube (21) and are slidably connected to the blanking push plate (24). A follower push frame (44) is rotatably installed on the blanking push plate (24).

9. The quick fixing device for laser welding of pipes according to claim 1, characterized in that: An oil pipe liner core (42) is fixedly mounted on the outside of the ring clamp bag (26), a joint ring (43) is sleeved on the oil pipe liner core (42), and a ring seam to be welded is provided between the joint ring (43) and the oil pipe liner core (42). The inner diameter of the oil pipe liner core (42) is adapted to the outer diameter of the positioning tube (21) and is sleeved on the positioning tube (21) after loading.

Images