A welding device for thin-walled cylindrical parts

Abstract

This invention relates to the field of welding equipment technology, and provides a welding device for thin-walled cylindrical parts, solving the technical problems of end-heat deformation and coaxiality during welding of a pair of thin-walled cylindrical parts. The welding device for thin-walled cylindrical parts is characterized by comprising: a welding support device, a welding roller rotating device, and a welding robotic arm; the welding support device is used to internally support the welding ends of two thin-walled cylindrical parts; two welding roller rotating devices are provided, each supporting one thin-walled cylindrical part, and the two welding roller rotating devices are driven synchronously; the welding robotic arm performs the welding operation through an end effector.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, and more specifically to a welding apparatus for thin-walled cylindrical parts. Background Technology

[0002] During the welding process of thin-walled cylindrical parts, especially when two thin-walled cylindrical sections are joined, the thin-walled cylindrical material is prone to deformation due to uneven heating during welding, leading to a decrease in weld quality. Additionally, slight dimensional differences between the two cylindrical sections can cause coaxiality issues, affecting the final product quality.

[0003] Therefore, we propose a welding device for thin-walled cylindrical parts. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a welding device for thin-walled cylindrical parts, which overcomes the shortcomings of the prior art, has a reasonable design and compact structure, and solves the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A welding apparatus for thin-walled cylindrical parts, characterized in that it comprises: Welding support device, welding roller rotating device, and welding robotic arm; The welding support device is used to support the welding ends of the two thin-walled cylindrical parts from the inside. The welding roller rotating device is provided in two, each welding roller rotating device supports a thin-walled cylindrical part, and the two welding roller rotating devices are driven synchronously. The welding robotic arm performs welding operations via an end effector.

[0006] Furthermore, the welding support device includes a circumferential expansion mechanism and a press-fit column assembly; The circumferential expansion mechanism includes several side plates that can be distributed in a circular pattern, and the side plates can expand outward synchronously. The side plate is provided with several sets of press-fit column assemblies on both sides of the joint of a pair of thin-walled cylinders, and each set of press-fit column assemblies is evenly distributed along the arc direction of the side plate. The press-fit column assembly includes a press-fit column, a first spring, and a first mounting base. The press-fit column is elastically connected to the first mounting base via the first spring. Under the action of the first spring, the press-fit column abuts against the inner wall of the thin-walled cylinder. The first mounting base is fixed to the side plate.

[0007] Furthermore, the press-fit column assembly also includes a limiting pin. The columnar portion of the press-fit column passes through the first mounting base and is connected to the limiting pin. The first spring is sleeved on the columnar portion of the press-fit column and its two ends abut against the head of the press-fit column and the end of the first mounting base, respectively.

[0008] Furthermore, an arc-shaped second mounting seat is fixed to the outer side wall of the side plate. The second mounting seat has a positioning groove for each press-fit column assembly. The bottom plate of the press-fit column assembly is fixed in the positioning groove by bolts. The first mounting seat and the bottom plate are connected by a snap-fit ​​structure.

[0009] Furthermore, the circumferential expansion mechanism includes a mandrel, a core tube, a connecting rod, a connecting beam, a connecting sleeve, an end plate, and rollers. The mandrel is fitted with a core tube, and the core tube is fitted with several connecting sleeves. A key block is fixed to the connecting sleeve. The key block passes through the first guide hole of the core tube and is fixed to the mandrel. The connecting beam is fixed to the inside of the side plate. The connecting beam and the connecting sleeves are movably connected by a connecting rod and a rotating shaft. The end plate is fixed to the outside of the core tube and has a second guide hole corresponding to each side plate. One end of the connecting beam passes through the second guide hole and is connected to the roller. The roller abuts against the end plate.

[0010] Furthermore, the two ends of the core tube and the mandrel respectively pass through two thin-walled cylindrical sections, and the two ends of the core tube are rotatably supported on the support by bearings.

[0011] Furthermore, the mandrel is coupled to the core tube at both ends via linear bearings, and one end of the mandrel is connected to an electric push rod.

[0012] Preferably, the core tube is fitted with a movable sleeve, and the movable sleeve has a slot corresponding to the connecting beam on the inner side of each side plate. The movable sleeve can be inserted into the side plate. A guide rod is connected to the first mounting seat of the thin-walled cylindrical part on the side where the movable sleeve is inserted. The guide rod passes through the third mounting seat and the side plate, and then a second spring is fitted on it and connected to a ball head. The third mounting seat is fixed to the side of the side plate, and the guide rod is parallel to the second guide hole on the same side.

[0013] Furthermore, a welding roller rotating device is provided between the side plate and the supports on both sides. The welding roller rotating device includes a pair of rollers, which are supported on the base, and one of the rollers is driven to rotate by a motor.

[0014] Furthermore, the roller is supported on a roller seat, which is floatingly supported on the base by a third spring and a guide post.

[0015] This invention provides a welding device for thin-walled cylindrical parts, which has the following advantages: Through the coordinated action of multiple press-fit column assemblies, the press-fit columns can float elastically under the action of springs, pressing against the inner wall of the thin-walled cylinder, effectively preventing the thin-walled cylinder from deforming due to uneven heating during the welding process, thus improving the welding quality.

[0016] The press-fit column assembly is evenly distributed along the arc direction of the side plate, which can provide all-round support for the thin-walled cylinder during the welding process, ensuring the coaxiality of the two thin-walled cylinders when they are joined, thus improving the welding accuracy and product reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a first-view structural schematic diagram of the welding support device in this invention; Figure 3 This is a second-view structural schematic diagram of the welding support device in this invention; Figure 4 For the present invention Figure 2 A magnified structural diagram of point A in the middle; Figure 5 This is a first-view structural schematic diagram of the press-fit column assembly in this invention; Figure 6 This is a first-view structural schematic diagram of the press-fit column assembly in this invention; Figure 7 This is a schematic diagram of the structure of the movable sleeve and press-fit column assembly in other embodiments; Figure 8 for Figure 7 A magnified structural diagram of section B.

[0018] In the picture: 100. Welding support mechanism; 111. Mandrel; 111a, First guide hole; 112. Core tube; 113. Connecting sleeve; 114. Key block; 115. Connecting beam; 116. Connecting rod; 117. Side panels; 118. End plate; 118a, Second guide hole; 119. Roller; 131. Second mounting bracket; 132. Press-fit column; 133. The first spring; 121. First mounting base; 122. Third mounting bracket; 123. Guide rod; 124. The second spring; 125. Ball head; 132a, Pin hole; 134. Limit pin; 135. Base plate; 141. Activity Set; 141a. Grooving; Support; Bearing housing; Electric linear actuator; Connectors; 200. Welding robotic arm; 300. Welding roller rotating device. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] See attached document Figure 1-6 A welding apparatus for thin-walled cylindrical parts, comprising: Welding support device 100, welding roller rotating device 300, and welding robotic arm 200; The welding support device 100 is used to support the welding ends of the two thin-walled cylindrical parts from the inside. The welding roller rotating device 300 is provided in two, each welding roller rotating device supports a thin-walled cylindrical part, and the two welding roller rotating devices are driven synchronously. The welding robotic arm 200 performs welding operations through an end effector. The welding robotic arm is a commercially available product, and the end effector is a welding gun or other welding tool.

[0021] In this embodiment, the welding support device includes a circumferential expansion mechanism and a press-fit column assembly; The circumferential expansion mechanism includes a plurality of side plates 117 that can be distributed in a circular pattern, and the plurality of side plates 117 can expand outward synchronously. The side plate 117 is provided with several sets of press-fit column assemblies on both sides of the joint of a pair of thin-walled cylinders, and each set of press-fit column assemblies is evenly distributed along the arc direction of the side plate 117. The press-fit column assembly includes a press-fit column 132, a first spring 133, and a first mounting base 121. The press-fit column 132 is elastically connected to the first mounting base 121 through the first spring 133. The press-fit column 132 abuts against the inner sidewall of the thin-walled cylinder under the action of the first spring 133. The first mounting base 121 is fixed on the side plate 117.

[0022] In this embodiment, the press-fit column assembly further includes a limiting pin 134. The columnar portion of the press-fit column 132 passes through the first mounting base 121. A pin hole 132a is provided at the root of the columnar portion of the press-fit column 132, and the limiting pin 134 is inserted into the pin hole 132a. The first spring 133 is sleeved on the columnar portion of the press-fit column 132, with its two ends abutting against the head of the press-fit column 132 and the end of the first mounting base 121, respectively. The limiting pin 134 is used to limit the floating range of the press-fit column 132 and prevent excessive extension and retraction. The lower part of the first mounting base 121 can be provided in a limiting groove that mates with the limiting pin 134 to guide the limiting pin 134 and allow the press-fit column 132 to rotate. In some other embodiments, the limiting pin 134 can be replaced by a limiting nut. The fiber nut is threadedly connected to the root of the columnar portion, which can adjust the preload of the first spring 133.

[0023] In this embodiment, an arc-shaped second mounting base 131 is fixed to the outer side wall of the side plate 117 by bolts. The second mounting base 131 has a positioning groove corresponding to each press-fit column assembly. The base plate 135 of the press-fit column assembly is fixed in the positioning groove by bolts. The first mounting base 121 and the base plate 135 are connected by a snap-fit ​​structure. This facilitates uniform and rapid adjustment and replacement of each group of press-fit column assemblies.

[0024] In this embodiment, the circumferential expansion mechanism includes a mandrel 111, a core tube 112, a connecting rod 116, a connecting beam 115, a connecting sleeve 113, an end plate 118, and a roller 119. The core tube 112 is sleeved on the mandrel 111. Both ends of the mandrel 111 are connected to the core tube 112 via linear bearings. One end of the mandrel 111 is connected to an electric push rod 153 via a connector 154. The output shaft of the electric push rod 153 is parallel to the mandrel 111, and the upper end of the connector 154 is fixed to the output shaft. The lower end of the core tube 112 is connected to the mandrel 111 via a bearing. Both ends of the core tube 112 and the mandrel 111 pass through two thin-walled cylindrical sections. The two ends of the core tube 112 are rotatably supported on the support 151 via bearings. The bearing seat 152 (where the bearing is installed) of one side of the support can be quickly disassembled from the support 151 body. For example, a corresponding mounting groove is provided on the support, the bearing seat is installed in the bearing seat, and the four corners are quickly disassembled from the support via thumb-type locking devices. Additionally, on this side or both sides... The support is slidably mounted on the track and is equipped with a corresponding positioning structure (such as a positioning pin) for easy and quick disengagement, repositioning, and positioning. The core tube 112 is fitted with several connecting sleeves 113, each with a key block 114 fixedly connected to it. The key block 114 passes through the elongated first guide hole 111a of the core tube 112 and is fixedly connected to the spindle 111. The connecting beam 115 is fixed to the middle of the inner side of the side plate 117. The connecting beam 115 and the connecting sleeves 113 are connected by a connecting rod. 116. A rotating shaft is movably connected. A sleeve is welded to the center hole of the end plate 118. The sleeve is fitted over the core tube 112 and fixed to the core tube 112 with bolts. The core plate has several radially extending second guide holes 118a that correspond one-to-one with each side plate 117. One end of the connecting beam 115 passes through the second guide hole 118a and is connected to a roller 119. In some embodiments, the connecting beam can be connected to rollers 119 on both sides of the end plate. The rollers 119 abut against the end plate 118. The electric push rod 153 drives the spindle 111 to move axially along the core tube 112. Under the connection of the key block 114, each connecting sleeve 113 moves synchronously with the spindle 111. Since the connecting sleeve 113 and the connecting beam 115 are movably connected through the connecting rod 116 and the rotating shaft, the connecting beam 115 is constrained by the roller 119 and the end plate 118, causing the connecting rod 116 to rotate, while the side plate 117 moves outward along the extension direction of the second guide hole 118a.

[0025] In this embodiment, a welding roller rotating device is provided between the side plate and the supports on both sides. The welding roller rotating device includes a pair of rollers, which are supported on the base. One of the rollers is driven to rotate by a motor. Preferably, the rollers are supported on roller seats, which are floatingly supported on the base by a third spring and a guide post. In other embodiments, the rollers are supported on roller seats, which are floatingly supported on a sliding plate by a third spring and a guide post. The sliding plate is slidably mounted on the base. The sliding plates corresponding to the pair of roller seats are simultaneously threaded with a double-acting screw. By rotating the screw, the roller seats are moved towards or away from each other to adjust the interval between the pair of roller seats. In addition, the supporting body of the pair of roller seats is V-shaped.

[0026] In some other embodiments, reference is made to the appendix. Figure 7 , 8 A movable sleeve 141 can also be installed on the outer sleeve of the core tube. The movable sleeve 141 has a slot 141a corresponding to the connecting beam on the inner side of each side plate. The movable sleeve 141 can be inserted into the side plate, specifically through the gap between the connecting rod and the side plate. A guide rod 123 is connected under the first mounting seat 121 of the thin-walled cylindrical part on the side where the movable sleeve is inserted. The guide rod 123 passes through the third mounting seat 122 and the side plate (not in the middle). Figure 7 , Figure 8 (As shown in the diagram) A second spring 124 is fitted and connected to a ball head 125. A third mounting base is fixed to the side of the side plate. The guide rod 123 is parallel to the second guide hole 118a on the same side. The distribution of the first mounting base can be referred to... Figure 2 , 3 Each side plate has six first mounting seats on its outer side (the two middle first mounting seats are adjacent and fit together), and every three first mounting seats simultaneously support the end of a thin-walled cylinder. In some other embodiments, please refer to the attached diagram. Figure 1After the electric push rod moves the mandrel to the left for the first time, the pressing columns on the three first mounting seats on the left side can abut against the inner wall of the left thin-walled cylinder, while the pressing columns on the three first mounting seats on the right side do not abut against the inner wall of the right thin-walled cylinder, or only slightly abut against the inner wall of the right thin-walled cylinder. At this time, the right thin-walled cylinder can still be adjusted to ensure that the end faces of the left and right thin-walled cylinders are effectively aligned and parallel. Then, after the electric push rod moves the mandrel to the left for the second time, the left side... The press-fitting column assemblies on the three first mounting seats have press-fitting columns that are floating under the action of the first spring, maintaining their position against the inner wall of the left thin-walled cylinder and further increasing the pressing force. The press-fitting column assemblies on the three first mounting seats on the right side, due to the guide rods overcoming the action of the second spring under the action of the movable sleeve, further push the first mounting seats and the press-fitting column assemblies mounted on them outwards, so that the press-fitting columns on the right side, while maintaining their position against the inner wall of the right thin-walled cylinder, can achieve a pressing force comparable to that of the press-fitting columns on the left. Further, refer to the attached... Figure 7 The lengths of the guide rods corresponding to each first mounting seat can be inconsistent, that is, the one closer to the left is slightly longer and the one closer to the right is slightly shorter. The ends of the movable sleeve are also stepped, which can realize distributed pressing and tightening.

[0027] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A welding device for thin-walled cylindrical parts, characterized in that, include: Welding support device, welding roller rotating device, and welding robotic arm; The welding support device is used to support the welding ends of the two thin-walled cylindrical parts from the inside. The welding roller rotating device is provided in two, each welding roller rotating device supports a thin-walled cylindrical part, and the two welding roller rotating devices are driven synchronously. The welding robotic arm performs welding operations via an end effector.

2. The welding device for thin-walled cylindrical parts according to claim 1, characterized in that, The welding support device includes a circumferential expansion mechanism and a press-fit column assembly; The circumferential expansion mechanism includes several side plates that can be distributed in a circular pattern, and the side plates can expand outward synchronously. The side plate is provided with several sets of press-fit column assemblies on both sides of the joint of a pair of thin-walled cylinders, and each set of press-fit column assemblies is evenly distributed along the arc direction of the side plate. The press-fit column assembly includes a press-fit column, a first spring, and a first mounting base. The press-fit column is elastically connected to the first mounting base via the first spring. Under the action of the first spring, the press-fit column abuts against the inner wall of the thin-walled cylinder. The first mounting base is fixed to the side plate.

3. The welding device for thin-walled cylindrical parts according to claim 2, characterized in that, The press-fit column assembly also includes a limiting pin. The columnar portion of the press-fit column passes through the first mounting base and is connected to the limiting pin. The first spring is sleeved on the columnar portion of the press-fit column and its two ends abut against the head of the press-fit column and the end of the first mounting base, respectively.

4. The welding device for a thin-walled cylindrical part according to claim 3, characterized in that, An arc-shaped second mounting seat is fixed to the outer side wall of the side plate. The second mounting seat has a positioning groove for each press-fit column assembly. The bottom plate of the press-fit column assembly is fixed in the positioning groove by bolts. The first mounting seat and the bottom plate are connected by a snap-fit ​​structure.

5. The welding apparatus for a thin-walled cylindrical part according to claim 2, characterized in that, The circumferential expansion mechanism includes a mandrel, a core tube, a connecting rod, a connecting beam, a connecting sleeve, an end plate, and rollers. The mandrel is fitted with a core tube, and the core tube is fitted with several connecting sleeves. A key block is fixed to the connecting sleeve. The key block passes through the first guide hole of the core tube and is fixed to the mandrel. The connecting beam is fixed to the inside of the side plate. The connecting beam and the connecting sleeves are movably connected by a connecting rod and a rotating shaft. The end plate is fixed to the outside of the core tube and has a second guide hole corresponding to each side plate. One end of the connecting beam passes through the second guide hole and is connected to the roller. The roller abuts against the end plate.

6. The welding apparatus for a thin-walled cylindrical part according to claim 5, characterized in that, The core tube and mandrel pass through two thin-walled cylindrical sections at both ends, and the two ends of the core tube are rotatably supported on the support by bearings.

7. The welding apparatus for a thin-walled cylindrical part according to claim 6, characterized in that, The mandrel is connected to the core tube at both ends by linear bearings, and one end of the mandrel is connected to an electric push rod.

8. The welding apparatus for a thin-walled cylindrical part according to claim 7, characterized in that, The core tube is fitted with a movable sleeve. The movable sleeve has a slot corresponding to the connecting beam on the inner side of each side plate. The movable sleeve can be inserted into the side plate. A guide rod is connected to the first mounting seat of the thin-walled cylindrical part on the side where the movable sleeve is inserted. The guide rod passes through the third mounting seat and the side plate, and then a second spring is fitted on it and connected to a ball head. The third mounting seat is fixed to the side of the side plate. The guide rod is parallel to the second guide hole on the same side.

9. The welding apparatus for a thin-walled cylindrical part according to claim 1, characterized in that, A welding roller rotating device is provided between the side plate and the supports on both sides. The welding roller rotating device includes a pair of rollers, which are supported on the base. One of the rollers is driven to rotate by a motor.

10. The welding apparatus for a thin-walled cylindrical part according to claim 9, characterized in that, The roller is supported on a roller seat, which is floated on the base by a third spring and a guide post.

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