Tubular hardware workpiece welding device

Abstract

The utility model relates to the technical field of large tubular hardware machining, in particular to a tubular hardware workpiece welding device. A tubular hardware workpiece welding device comprises a base, eight supports used for supporting pipe fittings are placed on the base and can drive the pipe fittings to rotate, four supports form a group and are used for supporting one pipe fitting, a welding mechanical arm capable of moving horizontally is arranged on one side of the base, and a welding machine is fixed to the welding mechanical arm. The tubular hardware workpiece welding device comprises a base, eight sets of symmetrically-distributed supports installed on the base and a welding mechanical arm arranged on one side of the base. According to the device, alternate continuous welding of the two pipe fittings is achieved through double-station synchronous rotation of the pipe fittings and cross-station collaborative operation of the mechanical arm, and the machining efficiency and the positioning precision are remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of large tubular hardware part processing, in particular to a welding device for tubular hardware workpieces. Background Technique

[0002] In the field of hardware pipe fitting welding, traditional devices generally use fixed V-shaped blocks or manually bolt-adjusted fixtures to clamp workpieces. Such structures require replacing fixtures for different pipe diameters or manually calibrating bolts one by one, resulting in low clamping efficiency and coaxiality deviation easily caused by human errors. Especially when welding long pipe fittings, the misalignment of concentricity at both ends of the support will exacerbate the rotation and晃动 of the workpiece, causing weld misalignment or uneven penetration. Existing rotary drive solutions mostly rely on a single motor to synchronously drive the rollers at both ends through chain or belt transmission. However, there is elastic deformation in the transmission system, and long-distance power transmission easily leads to asynchronous rotation speeds at both ends, causing the pipe fitting to be torsionally deformed and even interrupting welding in severe cases. In addition, in the single-station welding mode, the robotic arm needs to complete the circumferential seam welding on a single workpiece and then move to the next station, and multi-workpiece continuous processing cannot be achieved, seriously restricting the production capacity.

[0003] In view of the above defects, the designer actively conducts research and innovation to create a welding device for tubular hardware workpieces, making it more valuable in industry. Summary of the Invention

[0004] To solve the above technical problems, the purpose of the utility model is to provide a welding device for tubular hardware workpieces.

[0005] A welding device for tubular hardware workpieces of the utility model includes a base. There are eight supports for supporting pipe fittings placed on the base. The supports can drive the pipe fittings to rotate. Four supports form a group and are used to support one pipe fitting. There is a translatable welding robotic arm on one side of the base, and a welding machine is fixed on the welding robotic arm.

[0006] This welding device for tubular hardware workpieces includes a base, eight groups of symmetrically distributed supports installed on the base, and a welding robotic arm arranged on one side of the base. Among them, the eight supports are divided into two columns with four in each group. Each group supports both ends of a pipe fitting and drives it to rotate synchronously around the axis. The rotation axes of each group of supports are parallel and perpendicular to the length direction of the base. The welding robotic arm is connected to the base through a linear slide rail or a screw mechanism and can translate along the axial direction of the pipe fitting. A welding machine is fixed at its end to perform circumferential seam welding. The device realizes the alternating continuous welding of two pipe fittings through the double-station synchronous rotation of the pipe fittings and the cross-station collaborative operation of the robotic arm, significantly improving the processing efficiency and positioning accuracy.

[0007] Furthermore, the support includes a "U"-shaped mounting frame. Two positioning cylinders are fixed on both sides of the mounting frame. The positioning heads at the ends of the positioning cylinders pass through the through holes on the mounting frame and are inserted into the corresponding slots on the base.

[0008] The "Ji"-shaped mounting bracket is connected to the base through two positioning cylinders symmetrically fixed on both sides. After the piston rods of the positioning cylinders pass through the through holes on both sides of the mounting bracket, they are precisely inserted into the longitudinally preset positioning grooves on the surface of the base. During operation, by synchronously driving the four positioning cylinders to expand and contract, the vertical distance between the mounting bracket and the base can be quickly adjusted to adapt to the clamping height of workpieces with different pipe diameters. At the same time, the "Ji"-shaped structure offsets the lateral torque during the rotation of the pipe fittings through rigid support, and combined with the cylinder limit locking in the base groove, it effectively prevents the horizontal displacement or overturning of the mounting bracket, ensuring the dynamic stability of the pipe fittings during the welding process.

[0009] Furthermore, the supports are divided into driving supports and driven supports. Both the driving supports and the driven supports include roller frames fixed to the supports. Rollers are movably installed on the roller frames through shafts. On one side of the roller frame of the driving support, a driving motor is installed. The driving motor is fixedly connected to the shaft of the installed roller through a reducer. The driving supports and the driven supports are installed on the base in an inclined arrangement.

[0010] Both the driving support and the driven support include roller frames rigidly fixed to the supports. Freely rotatable rollers are movably installed on the roller frames through bearings. Among them, on one side of the roller frame of the driving support, a driving motor is additionally installed. The driving motor is fixedly connected to the driving shaft of the roller through a reducer, thereby transmitting power to the roller to drive the rotation of the pipe fitting. The roller frames of the driving support and the driven support are symmetrically installed on the base in an inclined arrangement, so that the contact surfaces of the rollers and the pipe fitting form a V-shaped support structure. Combined with the constant speed control of the driving motor, it ensures that the axis of the pipe fitting has no offset during the rotation process, meeting the high concentricity requirements of circumferential welding.

[0011] Furthermore, four groups of mounting sleeves are provided at the four corners of the bottom of the mounting bracket. A rotating shaft is movably installed in the mounting sleeve through a bearing. The lower end of the rotating shaft is provided with a supporting wheel through a mounting seat, and the lower edge of the supporting wheel extends beyond the lower edge of the mounting bracket.

[0012] Each group of mounting sleeves internally movably installs a freely rotatable rotating shaft through a bearing. The lower end of the rotating shaft is connected to the supporting wheel through a rigid mounting seat, and the lower edge of the supporting wheel always extends beyond the lower edge of the mounting bracket. When the mounting bracket moves, the supporting wheel contacts the ground or the guide rail and rotates along with the rotating shaft. The inclination angle of the supporting wheel is adaptively adjusted through the axial freedom of the bearing to offset the lateral stress caused by uneven load or path deviation of the mounting bracket. At the same time, the supporting wheels symmetrically arranged at the four corners form a redundant load-bearing structure, ensuring the stable support and smooth displacement of the mounting bracket under dynamic working conditions.

[0013] Furthermore, two cylinder frames are mirror-symmetrically arranged on both sides of the midline at the bottom of the mounting bracket. A reciprocating cylinder is installed in the cylinder frame. A rack is fixed on the moving block of the reciprocating cylinder. A toothed ring is provided on the outer circle of the rotating shaft, and the toothed ring meshes with the rack.

[0014] A reciprocating cylinder is vertically mounted inside the cylinder frame. A linear rack is fixed on the movable block at the end of the piston rod. At the same time, a gear ring is coaxially fitted on the outer ring of the rotating shaft. The gear ring and the rack form a precise mesh. When the reciprocating cylinder drives the movable block to reciprocate, the rack drives the gear ring to rotate in both directions. This, in turn, drives the support wheel to rotate horizontally through the rotating shaft. This facilitates the movement of the support on the base and allows for adjustment of the distance between multiple supports, meeting the welding operation requirements of tubular workpieces of different diameters.

[0015] Furthermore, a lead screw assembly is installed on the side wall of the base, and the welding robotic arm is mounted on the slider of the lead screw assembly.

[0016] The welding robot arm is rigidly connected to the slider of the lead screw assembly via a flange structure. When the lead screw assembly is driven by a servo motor, the slider moves linearly back and forth along the guide rail on the side wall of the base, which facilitates the welding machine on the welding robot arm to perform welding operations on the workpiece.

[0017] By means of the above solution, the present invention has at least the following advantages: The solution uses a cylinder frame, rack and gear ring with mirror symmetry at the bottom of the mounting frame to adjust the angle of the support wheel, which facilitates the movement of the support to the positioning area. The high-precision positioning system of the welding robot arm driven by the lead screw pair on the side wall of the base can quickly perform welding operations on the surface of the workpiece. At the same time as welding, the pipe is driven to rotate by driving the support, so as to achieve the purpose of welding and rotating at the same time, which improves the welding efficiency.

[0018] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show a certain embodiment of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the drive support of this utility model;

[0022] Figure 3 This is the utility model Figure 2 A magnified view of a portion of the image;

[0023] In the figure, 1 is the base, 2 is the support, 3 is the welding robotic arm, 4 is the mounting bracket, 5 is the positioning cylinder, 6 is the roller stand, 7 is the roller, 8 is the drive motor, 9 is the mounting sleeve, 10 is the rotating shaft, 11 is the support wheel, 12 is the cylinder bracket, 13 is the reciprocating cylinder, 14 is the rack, 15 is the gear ring, and 16 is the screw pair. Specific embodiments

[0024] The following combines the accompanying drawings and embodiments to further describe in detail the specific embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0025] See Figure 1 , for this kind of tubular hardware workpiece welding device, the four supports 2 on the left and right sides form two groups of supports 2. The two groups of supports 2 respectively clamp the two ends of the pipe fittings to be welded and drive them to rotate synchronously. At the same time, the welding robotic arm 3 can be translated axially along the linear slide rail on the side of the base 1, so that the welding machine can perform a full-circle continuous welding on the butt joint position of the rotating pipe fittings; the V-shaped support formed between the supports 2, and the design of the double-group supports 2 supports the synchronous processing of the double pipe fittings.

[0026] See Figure 2 , in this device, through the four groups of positioning cylinders 5 symmetrically distributed on both sides of the "U"-shaped mounting bracket 4, when the piston rod of the cylinder extends, it penetrates into the preset positioning groove of the base 1, realizing the rigid locking of the mounting bracket 4 and the base 1, so that the whole support 2 and the base 1 form a stable anti-overturning support.

[0027] The servo drive motor 8 that drives the support transmits the torque to the drive shaft of the roller 7 through the planetary reducer, driving the pipe fitting to rotate. At the same time, the roller 7 of the driven support follows synchronously under the friction of the pipe fitting; the roller stands 6 of the driving support and the driven support are symmetrically arranged at a 45° angle, forming a V-shaped self-centering clamping area. Through the adaptive adjustment of the contact angle between the polyurethane coating on the surface of the roller 7 and the pipe fitting, while eliminating the ovality deviation of the pipe fitting, axial positioning is achieved.

[0028] The support wheels 11 arranged at the four corners of the bottom of the mounting bracket 4 realize the flexible movement and precise positioning of the support 2. The support wheels 11 adopt a nylon-coated steel core structure and can rotate freely 360° through the deep groove ball bearings of the rotating shaft 10. When the support 2 is manually pushed, the four groups of support wheels 11 form rolling friction with the surface of the base 1, facilitating the movement of the support 2 to the appropriate positioning area, and配合 the positioning cylinder and the groove on the base 1 to complete the installation and positioning of the support 2.

[0029] See Figure 3Two sets of reciprocating cylinders 13 symmetrically arranged at the bottom of the mounting frame 4 drive the rack 14 to move linearly, which in turn drives the outer ring gear 15 of the rotating shaft 10 to rotate, thereby achieving ±90° tilt angle adjustment of the support wheel 11. When the cylinder 13 pushes the rack 14, the rotating shaft 10 rotates in the deep groove ball bearing, causing the support wheel 11 to switch from a vertical load-bearing state to an inclined guiding state. The wheel body forms a deflection angle with the contact surface of the base 1, realizing the linkage switching of the four support wheels 11 configuration. This can form a directional rolling trajectory during workstation adjustment and prevent displacement by self-locking the wheel body tilt angle during the locking stage. It is particularly suitable for the multi-directional position fine adjustment requirements during continuous welding of heavy pipe fittings.

[0030] See Figure 1 This device drives the welding robotic arm 3 to achieve precise axial displacement through the ball screw pair 16 installed on the side wall of the base 1, which facilitates welding operations.

[0031] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0032] Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.

[0033] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A welding device for tubular hardware workpieces, which comprises a base (1), and is characterized in that: eight supports (2) for supporting pipe fittings are placed on the base (1), the supports (2) can drive the pipe fittings to rotate, four supports (2) are in a group and used to support one pipe fitting, and there is a translatable welding robotic arm (3) on one side of the base (1), and a welding machine is fixed on the welding robotic arm (3). The support (2) comprises a "C"-shaped mounting frame (4), and two positioning cylinders (5) are fixed on both sides of the mounting frame (4). The positioning heads at the ends of the positioning cylinders (5) pass through the through holes on the mounting frame (4) and then insert into the corresponding slots on the base (1). The supports (2) are divided into driving supports and driven supports. Both the driving supports and the driven supports comprise roller frames (6) fixed to the supports (2). Rollers (7) are movably mounted on the roller frames (6) through shafts. A driving motor (8) is installed on one side of the roller frame (6) of the driving support. The driving motor (8) is fixedly connected to the shaft mounting the roller (7) through a reducer. The driving supports and the driven supports are installed on the base (1) in an inclined arrangement. Four groups of mounting sleeves (9) are arranged at the four corners at the bottom of the mounting frame (4). A rotating shaft (10) is movably mounted in the mounting sleeve (9) through a bearing. A supporting wheel (11) is installed at the lower end of the rotating shaft (IO) through a mounting seat, and the lower edge of the supporting wheel (11) extends beyond the lower edge of the mounting frame (4). Two cylinder frames (12) are arranged symmetrically on both sides of the middle line at the bottom of the mounting frame (4). A reciprocating cylinder (13) is installed in the cylinder frame (12). A rack (14) is fixed on the movable block of the reciprocating cylinder (13). A gear ring (15) is arranged on the outer circle of the rotating shaft (10), and the gear ring (15) meshes with the rack (14). A screw pair (16) is installed on the side wall of the base (1), and the welding robotic arm (3) is installed on the slider of the screw pair (16).

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