Automatic welding device and method for annular workpiece

Abstract

The invention provides an automatic welding device and method for annular workpieces, and belongs to the technical field of welding. The device comprises a workpiece fixing part, a rotating table, a driving motor, a rotating assembly, a welding power source and a welding gun; the workpiece fixing part is used for fixing a to-be-machined workpiece; the rotating table and the fixed workpiece are coaxially arranged, and the common axis is a first axis; the welding gun is fixed on the rotating table; positive and negative electrodes of the welding power supply are respectively connected with the welding gun and the workpiece fixing part; the rotating table is connected with the driving motor or the rotating assembly; the driving motor is in transmission connection with the rotating assembly; the rotating table and the welding gun rotate around the first axis under the transmission action of the driving motor and the rotating assembly. The welding gun is arranged on the rotating table, the driving motor drives the rotating table to rotate through the rotating assembly, automatic welding of the welding gun around the fixed annular workpiece is achieved, the welding quality is uniform and stable, the standard reaching rate of the welded workpiece is high, and unstable welding quality caused by manual operation is avoided.

Description

Technical Field

[0001] The invention relates to an automatic welding device and method for an annular workpiece, belonging to the technical field of welding. Background Art

[0002] At present, the hydraulic system in engineering machinery needs to be connected with metal pipe joints or hoses, which are prone to leakage. Therefore, the reliability of pipe joint welding directly affects the service life and reliability of the entire hydraulic system. In view of the shortcomings of complex overall processing procedures, high processing costs and low material utilization of oil pipe joint parts, the method of automatic positioning and automatic welding of pipe fittings and joints is adopted, which has the advantages of low cost, high material utilization and low labor cost.

[0003] In the prior art represented by the patent with application number CN201721888365, automatic welding of annular workpieces is achieved by fixing the welding handle and rotating the workpiece. Although this improves production efficiency, the weld position of the annular workpiece is easily deformed by heat and misaligned during the actual processing, resulting in weld defects and weld bead offset in the product. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide an automatic welding device and method for an annular workpiece, which solves the problem that the weld position of the annular workpiece is easily deformed by heat and misaligned during the automatic welding process.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides an annular workpiece automatic welding device, comprising: a workpiece fixing part, a rotating table, a driving motor, a rotating assembly, a welding power source and a welding gun; the workpiece fixing part is used to fix a first workpiece and a second workpiece to be processed; the rotating table is coaxially arranged with the fixed first workpiece and the second workpiece, and the common axis of the three is a first axis; The welding gun is fixed on the rotating table; the positive and negative electrodes of the welding power supply are respectively connected to the welding gun and the workpiece fixing part, so as to realize that the welding gun and the first workpiece and / or the second workpiece are energized during the automatic welding process; the rotating table is connected to the driving motor or the rotating component; the driving motor is transmission-connected to the rotating component; the rotating table and the welding gun rotate around the first axis under the transmission action of the driving motor and the rotating component.

[0006] Furthermore, it also includes: an installation base; the installation base includes: an upper fixed plate, a lower fixed plate and a vertical beam; a mounting hole is opened at the center of the rotating table, and the vertical beam is inserted into the mounting hole through a thrust bearing; the axis of the vertical beam is a first axis; the workpiece fixing part is installed on the upper fixed plate.

[0007] Further, the rotating assembly includes: a first gear fixed on the vertical beam, and a second gear meshing with the first gear; the driving motor is fixed on the rotating table and drives the second gear through an output bearing.

[0008] Further, the rotating table is a circular platform; the rotating assembly includes: a first gear fixed at the circumference of the rotating table, and a second gear meshing with the first gear; the driving motor is installed on the lower fixing plate and drives the second gear through an output bearing.

[0009] Further, the welding gun is installed on the rotating table through a first bracket; the welding gun is rotatably connected to the first bracket for adjusting the angle of the welding gun according to the welding joint positions of the first workpiece and the second workpiece.

[0010] Further, the first bracket is installed on the rotating table through a slidable member for adjusting the distance between the first bracket and the first axis according to the diameters of the first workpiece and the second workpiece.

[0011] Further, the workpiece fixing part includes: a chuck for fixing the first workpiece and a clamping member for fixing the second workpiece; the chuck is installed on the surface of the upper fixing plate.

[0012] Further, the clamping member is fixed on the lower fixing plate through a second bracket, or the clamping member is fixed through an external fixing member.

[0013] In a second aspect, based on the device described in the first aspect, the present invention provides an automatic welding method for annular workpieces, including: S0: Fix the first workpiece and the second workpiece to be processed by using the workpiece fixing part; S1: Turn on the driving motor to drive the rotating table and the welding gun to rotate at a constant speed; S2: Connect the welding power supply, and the welding gun welds the welding joints of the first workpiece and the second workpiece in a rotating posture; S3: When the welding time reaches a preset value, first disconnect the welding power supply, and then turn off the driving motor.

[0014] Further, it further includes: cleaning the weld between the first workpiece and the second workpiece; in response to the weld not meeting the preset welding requirements, repeating S1 to S3.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention: The automatic welding device for annular workpieces provided by the present invention sets the welding gun on the rotating table, and the driving motor is connected to the rotating table through the rotating assembly. Then, the rotating table automatically rotates at a constant speed under the drive of the driving motor, realizing the automatic and uniform rotation of the welding gun around the fixed first workpiece and the second workpiece, thereby realizing the automatic welding of the fixed annular workpiece. The welding quality of the annular workpiece automatically welded by the device of the present invention is uniform and stable, and the passing rate of the welded workpieces is high, especially for the ultra-thin annular workpieces with a thickness of 1 to 3 mm, avoiding the unstable welding quality caused by manual operation. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the automatic welding device for annular workpieces in Embodiment 2 of the present invention; In the figure: 1 - First workpiece; 2 - Second workpiece; 3 - Welding gun; 4 - First bracket; 5 - Chuck; 6 - Installation base; 7 - Rotating table; 8 - Thrust bearing; 9 - Positioning seat; 10 - Clamping spring; 11 - First gear 11; 12 - Welding power supply; 13 - Second gear; 14 - Driving motor; 15 - Output bearing. Detailed Embodiments

[0017] The terms "first", "second", "third", "fourth", etc. (if any) in the description, claims and drawings of the present application are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices. The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Embodiment 1

[0018] This embodiment provides an automatic welding device for annular workpieces, including: a workpiece fixing part, a rotating table 7, a driving motor 14, a rotating assembly, a welding power supply 12 and a welding gun 3.

[0019] Specifically, the workpiece fixing part is used to fix the first workpiece 1 and the second workpiece 2 to be processed, and the rotating table 7 is coaxially arranged with the fixed first workpiece 1 and the second workpiece 2, and the common axis of the three is the first axis.

[0020] It should be noted that during the automatic welding process, the first workpiece 1 and the second workpiece 2 need to be fixed by the workpiece fixing part and remain stationary. Moreover, the first workpiece 1 and the second workpiece 2 need to be annular workpieces with the same cross-section. Additionally, to ensure that the first workpiece 1 and the second workpiece 2 are in a tightly fitting state during welding, the distance between the fixed first workpiece 1 and the second workpiece 2 needs to meet the preset fixing requirements.

[0021] In some specific embodiments, the distance between the fixed first workpiece 1 and the second workpiece 2 is not greater than 3 millimeters.

[0022] The welding gun 3 is fixed on the rotating table 7; the positive and negative electrodes of the welding power supply 12 are respectively connected to the welding gun 3 and the workpiece fixing part. The workpiece fixing part can conduct electricity with the first workpiece 1 and / or the second workpiece 2, and is used to realize that during the automatic welding process, the welding gun 3 is connected to the positive electrode of the welding power supply 12, and the first workpiece 1 and / or the second workpiece 2 is connected to the negative electrode of the welding power supply 12.

[0023] The driving motor 14 is in transmission connection with the rotating assembly; the rotating table 7 is connected to the driving motor 14 or the rotating assembly; the rotating table 7 and the welding gun 3 rotate around the first axis under the transmission of the driving motor 14 and the rotating assembly.

[0024] In the present invention, the first workpiece 1 and the second workpiece 2 to be processed are fixed. The rotating table 7 is connected to the driving motor 14 through the rotating assembly, so that the rotating table 7 automatically rotates at a constant speed under the drive of the driving motor 14. The welding gun 3 is installed on the rotating table 7. When the driving motor 14 is working, while the welding gun 3 automatically rotates around the first workpiece 1 and the second workpiece 2, the welding gun 3 uniformly welds the welding joint between the first workpiece 1 and the second workpiece 2. Embodiment 2

[0025] Based on Embodiment 1, this embodiment provides a specific structure of an automatic welding device for annular workpieces.

[0026] Refer to Figure 1 , in this embodiment, the automatic welding device for annular workpieces uses a mounting base 6 as the base; the mounting base 6 is composed of a vertical beam and upper and lower mounting plates. The vertical beam is a cylinder, and the shapes of the upper mounting plate and the lower mounting plate are not limited.

[0027] In some embodiments, the workpiece fixing part includes: a chuck 5 for fixing the first workpiece 1 and a clamping member for fixing the second workpiece 2.

[0028] Specifically, the chuck 5 is a three-jaw chuck, and the three-jaw chuck is installed on the upper mounting plate; the clamping member includes: a positioning seat 9 and a clamping spring 10; the clamping spring 10 is installed on the positioning seat 9, and the positioning seat 9 can be fixed on the lower fixing plate through the second bracket or can be fixed by an external fixing member.

[0029] The rotating table 7 is sleeved on the vertical beam of the installation base 6. The specific installation method is as follows: an installation hole with a diameter slightly larger than the bottom diameter of the vertical beam is opened at the center of the rotating table 7, and the vertical beam is passed through the installation hole through a thrust bearing 8; the axis of the vertical beam is the first axis.

[0030] The rotating assembly includes: a first gear 11 fixed on the vertical beam, and a second gear 13 meshing with the first gear 11.

[0031] Specifically, as Figure 1 shown, the first gear 11 is fixed between the rotating table 7 and the upper mounting plate, the driving motor 14 is fixed on the lower surface of the rotating table 7, a small hole is opened on the rotating table 7, and the output bearing 15 of the driving motor 14 is passed through the small hole and then drives and connects the second gear 13.

[0032] The welding gun 3 is installed on the rotating table 7 through a first bracket 4, and the first bracket 4 remains in a vertical state; the welding gun 3 is rotatably connected to the first bracket 4 to enable the angle between the welding gun 3 and the first bracket 4 to be adjustable. During actual welding, first fix the first workpiece 1 and the second workpiece 2, and then adjust the angle between the welding gun 3 and the first bracket 4 according to the welding joint positions of the first workpiece 1 and the second workpiece 2, so that the welding gun 3 is aligned with the welding joints of the first workpiece 1 and the second workpiece 2 for automatic welding.

[0033] In some more comprehensive embodiments, the first bracket 4 is installed on the rotating table 7 through a slidable member to enable the distance between the first bracket 4 and the first axis to be adjustable; since the diameters of the welded workpieces in different batches may be inconsistent, therefore, it is also necessary to adjust the distance between the first bracket 4 and the first axis according to the diameters of the first workpiece 1 and the second workpiece 2.

[0034] In this embodiment, when the driving motor 14 is working, the second gear 13 is driven to rotate through the output bearing 15, while the first gear 11 is fixed and does not rotate. Therefore, the second gear 13 rotates around the outer circumference of the first gear 11 in a meshing state with the first gear 11, and further drives the driving motor 14, the rotating table 7 and the welding gun 3 to rotate. Embodiment 3

[0035] Based on Embodiment 2, this embodiment provides a different arrangement method and transmission method of the rotating assembly.

[0036] When the rotating table 7 is a circular platform, the rotating assembly includes: a first gear 11 fixed at the circumference of the rotating table 7, and a second gear 13 meshing with the first gear 11.

[0037] Specifically, the drive motor 14 is fixedly installed on the lower mounting plate and drives the second gear 13 through the output bearing 15. In this arrangement, the drive motor 14 remains stationary. In its working state, the second gear 13 is driven to rotate through the output bearing 15. The second gear 13 only rotates in place, while the first gear 11 meshing with it drives the rotating table 7 to rotate. Embodiment 4

[0038] This embodiment provides an automatic welding method for annular workpieces, including: Step 0: Fix the first workpiece 1 and the second workpiece 2 to be processed by using the workpiece fixing part.

[0039] Specifically, the first workpiece 1 and the second workpiece 2 are annular workpieces with the same diameter. After being fixed, the first workpiece 1, the second workpiece 2, and the rotating table 7 need to be coaxial, and the first workpiece 1 and the second workpiece 2 need to be in a tightly attached state.

[0040] In some embodiments, after the first workpiece 1 and the second workpiece 2 are fixed, it is also necessary to adjust the position and angle of the welding gun 3 according to the position of the weld interface between the current first workpiece 1 and the second workpiece 2 to ensure that the welding gun 3 is aligned with the weld interface for automatic welding.

[0041] Step 1: Turn on the drive motor 14 to drive the rotating table 7 and the welding gun 3 to rotate at a constant speed.

[0042] First, turn on the switch of the drive motor 14 without connecting the welding power supply 12. The reason is that the drive motor 14 has a startup buffer process. In a short period of time just after startup, the rotation speed is not yet stable and is not suitable for automatic welding.

[0043] In some specific embodiments, a fixed time difference is set between turning on the switch of the drive motor 14 and connecting the welding power supply 12.

[0044] Step 2: Connect the welding power supply 12, and the welding gun 3 welds the weld interface of the first workpiece 1 and the second workpiece 2 in a rotating posture; After the rotating table 7 rotates stably, connect the welding power supply 12 for automatic welding. During the welding process, the drive motor 14 always rotates at a constant speed to ensure the welding quality.

[0045] Step 3: When the welding duration reaches the preset value, first disconnect the welding power supply 12, and then turn off the drive motor 14.

[0046] The preset value of the welding duration is set according to the time required for the rotating table 7 to exactly rotate one week. That is to say, after one circle of automatic welding is completed, the welding will stop. The steps to stop welding are to first disconnect the welding power supply 12, and then turn off the drive motor 14 to stop the rotating table 7 from rotating.

[0047] In some embodiments, after completing one round of automatic welding, it is necessary to observe the condition of the weld seam and perform cleaning, cleaning the welding slag and welding tumors in the weld seam to ensure the surface cleanliness of the weld seam.

[0048] If the weld seam does not meet the welding requirements, repeat steps 1 to 3 to perform another round of automatic welding.

[0049] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An automatic welding device for annular workpieces, comprising: Workpiece fixing part, rotating table, driving motor, rotating assembly, welding power source and welding gun; The workpiece fixing portion is used to fix the first workpiece and the second workpiece to be processed; The rotating table is coaxially arranged with the fixed first workpiece and the second workpiece, and the common axis of the three is the first axis; The welding gun is fixed on the rotating table; The positive and negative electrodes of the welding power source are connected to the welding gun and the workpiece fixing part respectively, so as to realize that the welding gun and the first workpiece and / or the second workpiece are powered on during the automatic welding process; The rotating platform is connected to a driving motor or a rotating assembly; The driving motor is transmission-connected to the rotating assembly; The rotating platform and the welding gun rotate around the first axis under the transmission action of the driving motor and the rotating assembly.

2. The automatic welding device for annular workpieces according to claim 1, wherein, Also includes: Installation base; the installation base includes: an upper fixing plate, a lower fixing plate and a vertical beam; A mounting hole is provided at the center of the rotating platform, and the vertical beam is inserted into the mounting hole through a thrust bearing; the axis of the vertical beam is a first axis; The workpiece fixing portion is mounted on the upper fixing plate.

3. The automatic welding device for annular workpieces according to claim 2, wherein The rotating assembly comprises: a first gear fixed on the vertical beam, and a second gear meshing with the first gear; The driving motor is fixed on the rotating platform and drives the second gear through an output bearing.

4. The automatic welding device for annular workpieces according to claim 2, characterized in that, The rotating platform is a circular platform; The rotating assembly includes: a first gear fixed at the circumference of the rotating table, and a second gear meshing with the first gear; the driving motor is installed on the lower fixing plate and drives the second gear through an output bearing.

5. The automatic welding device for annular workpieces according to claim 1, characterized in that, The welding gun is mounted on the rotating table via a first bracket; the welding gun is rotatably connected to the first bracket and is used to adjust the angle of the welding gun according to the position of the welding port of the first workpiece and the second workpiece.

6. The automatic welding device for annular workpieces according to claim 5, characterized in that, The first bracket is mounted on the rotating table through a slidable member, and is used to adjust the distance between the first bracket and the first axis according to the diameters of the first workpiece and the second workpiece.

7. The automatic welding device for annular workpieces according to claim 2, wherein, The workpiece fixing part includes: a chuck for fixing the first workpiece and a clamping member for fixing the second workpiece; The chuck is mounted on the surface of the upper fixing plate.

8. The automatic welding device for annular workpieces according to claim 7, characterized in that, The clamping member is fixed to the lower fixing plate via a second bracket, or the clamping member is fixed via an external fixing member.

9. An automatic welding method for annular workpieces based on the device according to any one of claims 1-8, characterized in that, include: S0: Fixing the first workpiece to be processed and the second workpiece by using the workpiece fixing part; S1: Turn on the drive motor to drive the rotating table and welding gun to rotate at a constant speed; S2: Turn on the welding power supply, and the welding gun welds the welding joint of the first workpiece and the second workpiece in a rotating posture; S3: When the welding time reaches the preset value, the welding power supply is disconnected first, and then the drive motor is turned off.

10. The automatic welding method for an annular workpiece according to claim 9, wherein, Also includes: cleaning a weld between a first workpiece and a second workpiece; In response to the weld not satisfying the preset welding requirements, steps S1 to S3 are repeated.

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