AVC-OSC device and small-pipe-diameter automatic welding equipment

Abstract

The invention discloses an AVC-OSC device which comprises a shell and a sliding block with a first round hole channel, a first inner threaded hole channel and two second round hole channels, a tooth bar with the left end and the right end installed in the shell in a supported mode through first bearings is inserted into the first round hole channel in a penetrating mode, and the two second round hole channels are located on the same side of the first round hole channel. The hole wall of each second round hole channel penetrates through the hole wall of the first round hole channel to form a penetrating opening, so that the cylindrical racks penetrating through the second round hole channels are meshed with the tooth bar through the corresponding penetrating openings, and the upper ends of the two cylindrical racks penetrate out of the shell and then are fixed to the mounting base; a first screw rod of which the left end and the right end are respectively supported and mounted in the inner cavity of the shell through a second bearing is screwed in the first internal thread channel; the toothed bar is driven by a first driving device, and the first screw is driven by a second driving device. The device is small and flexible and reliable in operation. The invention also discloses an application of the AVC-OSC device.

Description

Technical Field

[0001] The invention relates to the technical field of argon arc welding automatic welding, and in particular to an AVC-OSC device and a small-diameter automatic welding device. Background Art

[0002] Since the accuracy of arc length control during welding directly affects the welding quality, automatic arc length tracking control (ARC VOLTAGE CONTROL, AVC) is a key factor in ensuring the quality of steel pipe welding and improving welding efficiency. The swing technology of automatic welding (OSCILLATION, OSC) is a key technology for achieving heat distribution and wide bead welding during welding.

[0003] At present, there are automatic welding equipment with AVC structure and OSC structure on the market. Although the AVC structure and the OSC structure are concentrated at or near the head C-shaped structure where the circumferential seam welder of the automatic welding equipment performs welding operations, both are independent and each occupies a certain space, which will result in a large volume at or near the head C-shaped structure where the circumferential seam welder performs welding operations, and thus a large rotation space will need to be reserved, and usually at least 48mm of rotation space needs to be reserved. Therefore, this type of automatic welding equipment with AVC structure and OSC structure can only be used in welding occasions where the spacing between pipe rows is 48mm or more, and is powerless for welding occasions where the spacing between pipe rows is less than 48mm, and can only use traditional manual welding methods or give up welding methods and choose other methods. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an AVC-OSC device with a compact structure, flexible and reliable operation. In addition, the present invention also provides a small-diameter automatic welding device using the AVC-OSC device. The device requires a small rotation space and can fully perform welding tasks in narrow welding working environments where the spacing between pipe rows is 25 mm.

[0005] For a tube row structure composed of a series of tubes arranged in a line, such as a water-cooled wall, when a part of a tube is damaged, the traditional approach is to directly replace the complete tube row structure, but this method has a high replacement cost, so the best solution is to directly cut off the damaged part of the tube, and then replace a good part of the replacement tube. When the local replacement tube is connected to the cut-off part of the tube row structure, a circumferential welding method is usually used. Since the traditional automatic welding equipment with AVC structure and OSC structure, although the AVC structure and OSC structure on it are set in the same area, they are not integrated, and each of them has to occupy a certain space independently, so the overall occupied space is relatively large, and inevitably occupies the rotation space, so it can only be used for welding occasions where the spacing between tube rows is 48mm or more. In order to improve the scope of application of automatic welding equipment with AVC structure and OSC structure, this scheme designs an AVC-OSC device, which integrates the AVC structure and OSC structure together, thereby reducing the volume of the rotation space occupied by the AVC structure and OSC structure.

[0006] The present solution provides an AVC-OSC device, comprising: a housing and a slider located in an inner cavity of the housing, wherein the slider is provided with a first circular hole channel penetrating left and right, a first internally threaded hole channel penetrating left and right, and two second circular hole channels penetrating up and down, wherein the first circular hole channel and the first internally threaded hole channel are parallel to each other, the two second circular hole channels are parallel to each other, and the first circular hole channel is perpendicular to any of the second circular hole channels; The gear rod is inserted into the first circular hole channel, and the left and right ends of the gear rod extending out of the left and right ends of the first circular hole channel are respectively supported and installed in the inner cavity of the shell through the first bearing support; A cylindrical rack is inserted in each second circular hole channel, the two second circular hole channels are located on the same side of the first circular hole channel, and the hole wall of each second circular hole channel penetrates the hole wall of the first circular hole channel to form a through-hole, so that the cylindrical rack inserted in the second circular hole channel is meshed with the gear rod through the corresponding through-hole, and the upper ends of the two cylindrical racks are respectively fixed to the mounting seat outside the shell after passing through the corresponding first through holes on the upper side plate of the shell; The first screw is screwed into the first internal thread channel, and the left and right ends of the first screw extending out of the left and right ends of the first internal thread channel are respectively supported and installed in the inner cavity of the shell through the second bearing. The gear rod is driven by the first driving device to rotate around the axis of the gear rod, so that the two cylindrical racks meshing with it move upward or downward synchronously along the axis direction of the cylindrical racks; the first screw is driven by the second driving device to rotate around the axis of the first screw, so that the slider moves left or right along the axis direction of the first screw.

[0007] At present, there are many types of drive devices on the market. Considering the simplicity and compactness, the following drive devices are adopted: The structure of the first driving device is as follows: a first turbine is fixedly mounted on the left or right end of the gear rod, a first driving motor is fixed to the front side plate of the housing, and a motor shaft of the first driving motor is fixedly connected to a first worm located in the inner cavity of the housing, and the first worm and the first turbine form a first set of worm gear transmission; The structure of the second driving device is as follows: a second turbine is fixedly mounted on the left end or the right end of the first screw, a second driving motor is fixed on the front side plate of the housing, and a motor shaft of the second driving motor is fixedly connected to a second worm located in the inner cavity of the housing, and the second worm and the second turbine form a second set of worm gear transmission; Wherein, the first set of worm gear transmission and the second set of worm gear transmission are located on the same side of the slider.

[0008] In order to prevent dust from accumulating on the surface of the first drive motor and the second drive motor after long-term use, the present solution is provided with an open port on the front side plate of the shell, the top shell is fixedly covered at the open port, an opening communicating with the inner cavity of the top shell is provided at the rear end of the top shell, the inner cavity of the top shell is communicated with the inner cavity of the shell through the opening and the open port, and the first drive motor and the second drive motor are both fixed in the top shell; An encoder is fixedly arranged on the upper side plate of the shell, and the shaft of the encoder is fixedly connected to a gear located in the inner cavity of the shell, and the gear is meshed with the first worm.

[0009] Furthermore, the aforementioned AVC-OSC device also includes: a U-shaped frame, the lower ends of the two cylindrical racks respectively pass through the corresponding second through holes on the lower side plate of the shell and extend into the two extension arms of the U-shaped frame, and are fixedly connected to the U-shaped frame by a plurality of fasteners. The setting of the U-shaped frame can ensure that the two cylindrical racks can move upward or downward synchronously smoothly and smoothly along the axial direction of the cylindrical racks during the driving process.

[0010] A conventional automatic welding device with an AVC structure and an OSC structure comprises: a frame, a clamping mechanism arranged on the frame, a girth welder, an OSC structure arranged on a rotating structure of the girth welder, and an AVC structure arranged on a rotating structure of the girth welder, wherein the welding torch in the girth welder controls the swing of the tungsten electrode tip in the welding torch through the OSC structure, and the welding torch in the girth welder controls the distance between the tungsten electrode tip in the welding torch and the girth through the AVC structure.

[0011] The small-diameter automatic welding equipment described in this scheme is improved on the traditional automatic welding equipment. The improvement method is to use the AVC-OSC device described in this scheme to replace the traditional OSC structure set on the rotating structure of the girth welder and the AVC structure set on the rotating structure of the girth welder. Among them, the shell of the AVC-OSC device is fixedly installed on the rotating structure of the girth welder, and the welding torch is fixedly installed on the mounting seat of the AVC-OSC device through the base. The welding torch, the base, and the AVC-OSC device form a semi-enclosed C-shaped structure; when the pipe to be welded is clamped in the clamping mechanism, the pipe to be welded is located in the hollow area of ​​the C-shaped structure, and the tungsten electrode tip in the welding torch faces the girth of the pipe to be welded. A baffle opposite to the tungsten electrode tip in the welding torch is fixedly arranged on the shell of the AVC-OSC device. At this time, the girth of the pipe to be welded is located in the space between the tungsten electrode tip and the baffle.

[0012] At this time, the mounting seat, two cylindrical racks, slider, gear rod, and first driving device constitute an OSC structure, in which the encoder plays a role in accurately controlling the swing amplitude of the welding torch tungsten electrode. The mounting seat, two cylindrical racks, slider, first screw, and second driving device constitute an AVC structure.

[0013] On the basis of the above improved structure, the present invention also improves the clamping mechanism on the traditional automatic welding equipment to make it occupy a smaller space, wherein the clamping mechanism is composed of two pipe clamping mechanisms; the two pipe clamping mechanisms are respectively located above and below the girth welder; The structure of each pipe clamping mechanism includes: a fixed clamping jaw and a movable clamping jaw; the fixed clamping jaw is composed of a fixed connecting arm and a fixed gripping portion located at the front end of the fixed connecting arm, and a first hinged arm is arranged at the front end of the fixed connecting arm; the movable clamping jaw is composed of a movable connecting arm and a movable gripping portion located at the front end of the movable connecting arm, and a second hinged arm is arranged at the front end of the movable connecting arm; the first hinged arm and the second hinged arm are hingedly connected, and a swinging structure is arranged between the fixed connecting arm and the movable connecting arm to drive the movable connecting arm to swing around the hinge point between the first hinged arm and the second hinged arm, so that the movable gripping portion approaches or moves away from the fixed gripping portion; In addition, in order to improve the stability of clamping, in this solution, the clamping opening of the fixed clamping part and / or the clamping opening of the movable clamping part are designed to be V-shaped.

[0014] Furthermore, the aforementioned small-diameter automatic welding equipment, wherein the swing structure includes: a second screw and a movable block; a circle of annular groove is provided on the head of the second screw, a handle is fixedly installed on the tail of the second screw, a threaded hole is provided in the movable block, and the movable block is screwed on the second screw through the threaded hole; one end of the connecting rod is hinged to the rear end of the movable connecting arm, and the other end of the connecting rod is hinged to the movable block; a mounting hole and two limiting threaded holes are provided on the fixed connecting arm, and after the head of the second screw is extended into the mounting hole, two limiting screws are respectively screwed into the corresponding limiting threaded holes, and the two limiting screws screwed into the corresponding limiting threaded holes are stuck in the annular groove.

[0015] Furthermore, in the aforementioned small-diameter automatic welding equipment, the fixed connecting arm, the fixed clamping portion, and the first hinged arm are an integral structure formed by integral molding, and the movable connecting arm, the movable clamping portion, and the second hinged arm are an integral structure formed by integral molding; The movable connecting arm is formed by a first straight rod and a first U-shaped connecting frame located at the rear end of the first straight rod; the connecting rod is formed by a second straight rod and a second U-shaped connecting frame located at the rear end of the second straight rod; the second straight rod extends into the two first extension arms of the first U-shaped connecting frame and is hingedly connected to the two first extension arms of the first U-shaped connecting frame; the movable block extends into the two second extension arms of the second U-shaped connecting frame and is hingedly connected to the two second extension arms of the second U-shaped connecting frame.

[0016] Furthermore, in the aforementioned small-diameter automatic welding equipment, the frame is formed by an upper mounting arm, a lower mounting arm, and a middle connecting arm connecting the upper mounting arm and the lower mounting arm to form a U-shaped frame structure; the fixed connecting arm of the pipe clamping mechanism located above the girth welder is the upper mounting arm of the frame, and the fixed connecting arm of the pipe clamping mechanism located below the girth welder is the lower mounting arm of the frame. The girth welder is fixed on the lower mounting arm of the frame.

[0017] Furthermore, in the aforementioned small-diameter automatic welding equipment, the fixed clamping part is composed of a first connecting seat and a plurality of first clamping blocks of different heights, and any first clamping block can be fixed to the first connecting seat by a plurality of first fastening screws; the movable clamping part is composed of a second connecting seat and a plurality of second clamping blocks of different heights, and any second clamping block can be fixed to the second connecting seat by a plurality of second fastening screws; in addition, in order to improve the stability of clamping, the present scheme designs the clamping opening of each first clamping block or / and the clamping opening of each second clamping block as a V-shaped clamping opening.

[0018] The beneficial effects of the present invention are: ① The AVC-OSC device integrates the front-to-back direction adjustment and the up-and-down direction adjustment into the same shell, shares the inner cavity space of the shell, shares some of the parts therein, and has a compact and small overall structure, and is flexible and reliable in operation; ② The small-diameter automatic welding equipment using the AVC-OSC device described in this scheme requires a small overall rotation space, and can be used in welding operations where the spacing between pipe rows is 25 mm or more, and has a wider range of applications; ③ The clamping mechanism in the equipment can realize automatic centering of two sections of pipes after clamping, omitting the manual centering process, and has higher centering accuracy. The annular welding process can be performed immediately after clamping, simplifying the process, saving time, and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the AVC-OSC device described in the present invention.

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the AVC-OSC device of the present invention with the shell removed.

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the AVC-OSC device of the present invention when the housing is removed and the device is in another viewing direction.

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the small-diameter automatic welding equipment described in the present invention.

[0023] Figure 5 yes Figure 4 Schematic diagram of the local structure.

[0024] Figure 6 It is a three-dimensional structural schematic diagram of the small-diameter automatic welding equipment of the present invention when it is viewed from another direction.

[0025] Figure 7 yes Figure 6 Schematic diagram of the local structure.

[0026] Figure 8 It is a schematic diagram of the planar structure of the small-diameter automatic welding equipment of the present invention.

[0027] Fig. 9 yes Figure 8 Schematic diagram of the local structure in the AA section direction.

[0028] in: 1. Shell; 11. Top shell; 12. Encoder; 13. Gear; 14. Baffle; 15. Upper side plate; 2. Slider; 21. First circular hole channel; 22. First internal threaded hole channel; 23. Second circular hole channel; 3. Gear rod; 31. First bearing; 32. First turbine; 33. First worm; 34. First drive motor; 4. Cylindrical rack; 41. Mounting seat; 42. U-shaped frame; 421. Extension arm; 422. Fastener; 5. First screw; 51. Second bearing; 52. Second turbine; 53. Second worm; 54. Second drive motor; 6. Frame; 61. Upper mounting arm; 62. Lower mounting arm; 63. Middle connecting arm; 7. Circumferential seam welder; 71. Welding torch; 72. Base; 73. Tungsten electrode tip; 8. Fixed clamping jaw; 81. Fixed connecting arm; 811. Mounting hole; 812. Limit threaded hole; 813. Limit screw; 82. Fixed clamping part; 821. First connecting seat; 822. First clamping block; 83. First articulated arm; 9. Moveable clamping jaw; 91. Moveable connecting arm; 911. First straight rod; 912. First U-shaped connecting frame; 92. Moveable clamping part; 921. Second connecting seat; 922. Second clamping block; 93. Second articulated arm; 10. Second screw rod; 1001. Annular groove; 20. Moveable block; 30. Connecting rod; 3001. Second straight rod; 3002. Second U-shaped connecting frame; 101. Welding pipe material one; 102. Pipe material two to be welded; 103. Annular seam. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0030] To facilitate the description of the positional relationship between the components, Figure 1 The coordinate system is established in Figure 1 The coordinate system shown defines the relative positions of the components by indicating the directions of "left", "right", "front", "back", "up" and "down". It should be noted that the directions defined here are only for the convenience of describing the relative positions of the components, and are not intended to limit the installation direction of the device and equipment. The installation direction of the device and equipment is determined according to the actual required installation position and angle. Embodiment 1

[0031] An AVC-OSC device described in this embodiment, such as Figure 1 , Figure 2 and Figure 3As shown, it includes: a shell 1 and a slider 2 arranged in the shell 1, on which a first circular hole channel 21 penetrating left and right, a first internally threaded hole channel 22 penetrating left and right, and two second circular hole channels 23 penetrating up and down are arranged, the first circular hole channel 21 and the first internally threaded hole channel 22 are parallel to each other, the two second circular hole channels 23 are parallel to each other, and the first circular hole channel 21 is perpendicular to any second circular hole channel 23.

[0032] like Figure 2 and Figure 3 As shown, the gear rod 3 is inserted into the first circular hole channel 21, and the left and right ends of the gear rod 3 extending out of the first circular hole channel 21 are respectively supported and installed in the inner cavity of the shell 1 through the first bearing 31, wherein the support for fixing the first bearing 31 can be set on the inner cavity wall of the shell 1.

[0033] like Figure 2 and Figure 3 As shown, a cylindrical rack 4 is inserted in each second circular hole channel 23, and the two second circular hole channels 23 are located on the same side of the first circular hole channel 21, and the hole wall of each second circular hole channel 23 penetrates the hole wall of the first circular hole channel 21 to form a through-hole, so that the cylindrical rack 4 inserted in the second circular hole channel 23 is engaged with the gear rod 3 through the corresponding through-hole, and the upper ends of the two cylindrical racks 4 pass through the corresponding first through holes on the upper side plate 15 of the shell 1 and are fixed on the mounting seat 41 outside the shell 1.

[0034] In order to ensure that the two cylindrical racks 4 can move upward or downward synchronously smoothly and smoothly along the axial direction of the cylindrical racks 4 during the driving process, the present embodiment is further provided with a U-shaped frame 42, and the lower ends of the two cylindrical racks 4 respectively pass through the corresponding second through holes on the lower side plate of the shell 1 and extend into the two extension arms 421 of the U-shaped frame 42, and are fixedly connected to the U-shaped frame 42 by a plurality of fasteners 422.

[0035] like Figure 2 and Figure 3 As shown, the first screw 5 is rotated in the first internal threaded channel 22, and the left and right ends of the first screw 5 extending out of the first internal threaded channel 22 are respectively supported and installed in the inner cavity of the shell 1 through second bearings 51; wherein, the support for fixing the second bearing 51 can be set on the inner cavity wall of the shell 1.

[0036] The gear bar 3 is driven by the first driving device to rotate around its own axis, so that the two cylindrical racks 4 meshing therewith move upward or downward synchronously along the axis direction of the cylindrical racks 4, and finally achieve the purpose of the up and down movement of the mounting seat 41. Among them, the structure of the first driving device is: a first turbine 32 is fixedly installed on the left end or right end of the gear bar 3, the first driving motor 34 is fixed on the front side plate of the shell 1, and the motor shaft of the first driving motor 34 is fixedly connected to the first worm 33 located in the inner cavity of the shell 1, and the first worm 33 and the first turbine 32 constitute a first set of worm gear transmission. When the first driving motor 34 rotates forward or reversely, the gear bar 3 can be driven to rotate forward or reversely through the first set of worm gear transmission.

[0037] The first screw 5 is driven by the second driving device to rotate around its own axis, so that the slider 2 moves left or right along the axis direction of the first screw 5, and finally achieves the left and right movement of the mounting seat 41. The structure of the second driving device is as follows: a second turbine 52 is fixedly installed at the left end or right end of the first screw 5, a second driving motor 54 is fixed to the front side plate of the housing 1, and the motor shaft of the second driving motor 54 is fixedly connected to the second worm 53 located in the inner cavity of the housing 1, and the second worm 53 and the second turbine 52 constitute a second set of worm gear transmission. When the second driving motor 54 rotates forward or reversely, the first screw 5 can be driven to rotate forward or reversely through the second set of worm gear transmission.

[0038] In order to make the overall structure compact and small, the first set of worm gear transmission and the second set of worm gear transmission are arranged on the same side of the slider 2.

[0039] In addition, in order to prevent dust from accumulating on the surface of the first drive motor 34 and the second drive motor 54 after long-term use, the present embodiment provides an open opening on the front side panel of the shell 1, and the top shell 11 is fixedly covered at the open opening. An opening communicating with the inner cavity of the top shell 11 is provided at the rear end of the top shell 11, and the inner cavity of the top shell 11 is communicated with the inner cavity of the shell 1 through the opening and the open opening, and the first drive motor 34 and the second drive motor 54 are both fixed in the top shell 11.

[0040] In order to accurately control the up and down movement amplitude of the mounting base 41 , an encoder 12 is fixedly provided on the upper side plate 15 of the shell 1 in this embodiment, and the shaft of the encoder 12 is fixedly connected to a gear 13 located in the inner cavity of the shell 1 , and the gear 13 is meshed with the first worm 31 .

[0041] The above-mentioned AVC-OSC device integrates the front-to-back direction adjustment and the up-and-down direction adjustment into the same housing 1, shares the inner cavity space of the housing 1, and shares some of the components therein. The overall structure is compact and small, and the operation is flexible and reliable.

[0042] The AVC-OSC device can be used as a rotating structure for connecting a welding torch and an annular welder in an automatic welding device. At this time, the mounting seat 41, two cylindrical racks 4, the slider 2, the gear rod 3, and the first drive device constitute an OSC structure for controlling the swing and swing amplitude of the tungsten tip in the welding torch in the annular welder. The mounting seat 41, two cylindrical racks 4, the slider 2, the first screw 5, and the second drive device constitute an AVC structure for controlling the distance between the tungsten tip in the welding torch in the annular welder and the annular seam on the pipe to be welded. The AVC-OSC device can also be used as a wire feeding adjustment device for adjusting the wire feeding direction in the wire feeding device in the automatic welding device, and can also be used for other purposes. Embodiment 2

[0043] The small-diameter automatic welding equipment described in this embodiment includes: a frame 6, a clamping mechanism arranged on the frame 6, and a girth welder 7. The girth welder 7 adopts a girth welder 7 with a head C-shaped structure commonly seen on the market, and a welding torch 71 on the girth welder 7 is arranged on the rotating structure of the girth welder 7 through an AVC-OSC device. The welding torch 71 is driven by the rotating structure of the girth welder 7 to rotate around the girth 103 between the first pipe 101 to be welded and the second pipe 102 to be welded clamped in the clamping mechanism.

[0044] like Figure 4 , Figure 6 and Figure 8 As shown, the AVC-OSC device described in this embodiment adopts the AVC-OSC device described in Example 1, wherein the housing 1 of the AVC-OSC device is fixedly mounted on the rotating structure of the girth welder 7, and the welding torch 71 is fixedly mounted on the mounting seat 41 of the AVC-OSC device through the base 72. The welding torch 71, the base 72, and the AVC-OSC device form a semi-enclosed C-shaped structure, which just matches the C-shaped structure of the head of the girth welder 7.

[0045] When the pipe 101 to be welded and / or the pipe 2 102 to be welded are clamped in the clamping mechanism, the pipe 101 to be welded and / or the pipe 2 102 to be welded are located in the hollow area of ​​the C-shaped structure, the tungsten electrode tip 73 in the welding torch 71 faces the annular seam 103, and a baffle 14 is fixedly arranged on the housing 1 of the AVC-OSC device, which is opposite to the tungsten electrode tip 73 in the welding torch 71.

[0046] At this time, the mounting seat 41, the two cylindrical racks 4, the slider 2, the gear rod 3, and the first driving device constitute an OSC structure, which is used to control the swing and swing amplitude of the tungsten tip 73 in the welding torch 71 in the ring welder 7. The mounting seat 41, the two cylindrical racks 4, the slider 2, the first screw 5, and the second driving device constitute an AVC structure, which is used to control the distance between the tungsten tip 73 in the welding torch 71 in the ring welder 7 and the annular seam 103.

[0047] The above-mentioned small-diameter automatic welding equipment requires a small rotation space as a whole, and can be used in narrow welding operations where the spacing between pipe rows is 25 mm or more, and has a wider range of applications. Embodiment 3

[0048] This embodiment is based on the second embodiment, and improves the clamping mechanism on the traditional automatic welding equipment, so that it occupies less space, has a more compact structure, and is more stable. The improved clamping mechanism is composed of two pipe clamping mechanisms; the two pipe clamping mechanisms are respectively located above and below the girth welder 7.

[0049] like Figure 5 , Figure 7 and Figure 8 As shown, the structure of each pipe clamping mechanism includes: a fixed clamping jaw 8 and a movable clamping jaw 9. The fixed clamping jaw 8 is composed of a fixed connecting arm 81 and a fixed clamping portion 82 located at the front end of the fixed connecting arm 81, and a first hinged arm 83 is provided at the front section of the fixed connecting arm 81, wherein the fixed connecting arm 81, the fixed clamping portion 82, and the first hinged arm 83 are preferably an integral structure formed by integral molding. The movable clamping jaw 9 is composed of an active connecting arm 91 and an active clamping portion 92 located at the front end of the active connecting arm 91, and a second hinged arm 93 is provided at the front section of the active connecting arm 91, wherein the active connecting arm 91, the active clamping portion 92, and the second hinged arm 93 are preferably an integral structure formed by integral molding.

[0050] The first hinged arm 83 and the second hinged arm 93 are hinged, and a swinging structure is provided between the fixed connecting arm 81 and the movable connecting arm 91 to drive the movable connecting arm 91 to swing around the hinge point between the first hinged arm 83 and the second hinged arm 93, so that the movable clamping part 92 moves closer to or away from the fixed clamping part 82.

[0051] like Figure 5 , Figure 7 , Figure 8 and Fig. 9As shown, the swing structure described in this embodiment includes: a second screw rod 10 and a movable block 20; a circle of annular groove 1001 is provided on the head of the second screw rod 10, and a handle 1002 is fixedly installed at the tail of the second screw rod 10, and a threaded hole is provided in the movable block 20, and the movable block 20 is screwed on the second screw rod 10 through the threaded hole; one end of the connecting rod 30 is hinged to the rear end of the movable connecting arm 91, and the other end of the connecting rod 30 is hinged to the movable block 20; a mounting hole 811 and two limiting threaded holes 812 are provided on the fixed connecting arm 81, and after the head of the second screw rod 10 extends into the mounting hole 811, two limiting screws 813 are respectively screwed into the corresponding limiting threaded holes 812, and the two limiting screws 813 screwed into the corresponding limiting threaded holes 812 are stuck in the annular groove 1001. At this time, the axial position of the second screw rod 10 is limited by the two limit screws 813 and the annular groove 1001, so the second screw rod 10 can only rotate under the action of external force but cannot move axially.

[0052] In addition, in order to improve the stability of the clamping, in this solution, the clamping opening of the fixed clamping part 82 and / or the clamping opening of the movable clamping part 92 is designed to be a V-shaped clamping opening.

[0053] In order to reduce the space occupied by the clamping mechanism, the present embodiment designs the movable connecting arm 91 to be integrally formed by a first straight rod 911 and a first U-shaped connecting frame 912 located at the rear end of the first straight rod 911; the connecting rod 30 is integrally formed by a second straight rod 3001 and a second U-shaped connecting frame 3002 located at the rear end of the second straight rod 30; the second straight rod 3001 extends into the two first extension arms of the first U-shaped connecting frame 912 and is hingedly connected to the two first extension arms of the first U-shaped connecting frame 912; the movable block 20 extends into the two second extension arms of the second U-shaped connecting frame 3002 and is hingedly connected to the two second extension arms of the second U-shaped connecting frame 3002.

[0054] In this embodiment, the frame 6 is formed integrally by an upper mounting arm 61 , a lower mounting arm 62 , and a middle connecting arm 63 connecting the upper mounting arm 61 and the lower mounting arm 62 to form a U-shaped frame structure.

[0055] In order to reduce the space occupied by the overall equipment, the fixed connecting arm of the pipe clamping mechanism located above the girth welder 7 is the upper mounting arm 61 of the frame 1, that is, the upper mounting arm 61 of the frame 1 is both a part of the structure of the frame 1 and the fixed connecting arm of the pipe clamping mechanism located above the girth welder 7. The fixed connecting arm of the pipe clamping mechanism located below the girth welder 7 is the lower mounting arm 62 of the frame 1, that is, the lower mounting arm 62 of the frame 1 is both a part of the structure of the frame 1 and the fixed connecting arm of the pipe clamping mechanism located below the girth welder 7. In addition, the girth welder 7 is fixed to the lower mounting arm 62 of the frame 1.

[0056] In actual use, the pipes in the pipe row are matched with different pipe diameters according to the actual use scene, and the pipe clamping mechanism is limited by the stroke of the spiral transmission composed of the second screw 10 and the movable block 20, so the pipe diameter range of the pipe row applicable is small. In order to expand the scope of application, the fixed clamping part 82 is designed in this embodiment to be composed of a first connecting seat 821 and a plurality of first clamping blocks 822 of different heights. Any first clamping block 822 can be fixed on the first connecting seat 821 by a plurality of first fastening screws. In actual use, the first clamping block 822 of appropriate height can be adapted according to different pipes. Similarly, the movable clamping part 92 is designed to be composed of a second connecting seat 921 and a plurality of second clamping blocks 922 of different heights. Any second clamping block 922 can be fixed on the second connecting seat 921 by a plurality of second fastening screws. In actual use, the second clamping block 922 of appropriate height can be adapted according to different pipes. At this time, the device can be clamped for pipes with a diameter of 5 to 30 mm in the pipe row.

[0057] In addition, in order to improve the stability of clamping, the clamping opening of each first clamping block 922 and / or the clamping opening of each second clamping block 922 is designed to be a V-shaped clamping opening.

[0058] The equipment adopts the above-mentioned clamping mechanism, which can realize automatic centering of two sections of pipes after clamping, omitting the manual centering process and achieving higher centering accuracy. The circular welding process can be carried out immediately after clamping, thus simplifying the process, saving time and improving work efficiency.

[0059] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

[0060] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An AVC-OSC device, comprising: The housing is characterized in that it also includes a slider, on which a first circular hole channel passing through left and right, a first internally threaded hole channel passing through left and right, and two second circular hole channels passing through up and down are provided, the first circular hole channel and the first internally threaded hole channel are parallel to each other, the two second circular hole channels are parallel to each other, and the first circular hole channel is perpendicular to any second circular hole channel; The gear rod is inserted into the first circular hole channel, and the left and right ends of the gear rod extending out of the first circular hole channel are respectively supported and installed in the inner cavity of the shell through the first bearing support; A cylindrical rack is inserted in each second circular hole channel, the two second circular hole channels are located on the same side of the first circular hole channel, and the hole wall of each second circular hole channel penetrates the hole wall of the first circular hole channel to form a through-hole, so that the cylindrical rack inserted in the second circular hole channel is meshed with the gear rod through the corresponding through-hole, and the upper ends of the two cylindrical racks are respectively fixed to the mounting seat outside the shell after passing through the corresponding first through holes on the upper side plate of the shell; The first screw is screwed into the first internal thread channel, and the left and right ends of the first screw extending out of the first internal thread channel are respectively supported and installed in the inner cavity of the shell through second bearings; The gear rod is driven by the first driving device to rotate around its own axis, so that the two cylindrical racks meshing with it move upward or downward synchronously along the axis direction of the cylindrical racks; the first screw is driven by the second driving device to rotate around its own axis, so that the slider moves left or right along the axis direction of the first screw.

2. An AVC-OSC device according to claim 1, characterized in that: The structure of the first driving device is as follows: a first turbine is fixedly mounted on the left or right end of the gear rod, a first driving motor is fixed to the front side plate of the housing, and a motor shaft of the first driving motor is fixedly connected to a first worm located in the inner cavity of the housing, and the first worm and the first turbine form a first set of worm gear transmission; The structure of the second driving device is as follows: a second turbine is fixedly mounted on the left end or the right end of the first screw, a second driving motor is fixed on the front side plate of the housing, and a motor shaft of the second driving motor is fixedly connected to a second worm located in the inner cavity of the housing, and the second worm and the second turbine form a second set of worm gear transmission; The first set of worm gear transmission and the second set of worm gear transmission are located on the same side of the slider.

3. An AVC-OSC device according to claim 2, characterized in that: The front side plate of the shell is provided with an open opening, the top shell is fixedly covered at the open opening, an opening communicating with the inner cavity of the top shell is provided at the rear end of the top shell, the inner cavity of the top shell is communicated with the inner cavity of the shell through the opening and the open opening, and the first drive motor and the second drive motor are both fixed in the top shell; An encoder is fixedly arranged on the upper side plate of the shell, and the shaft of the encoder is fixedly connected to a gear located in the inner cavity of the shell, and the gear is meshed with the first worm.

4. The AVC-OSC device according to claim 1, characterized in that: Also includes: The lower ends of the two cylindrical racks of the U-shaped frame respectively pass through the corresponding second through holes on the lower side plate of the shell and then extend into the two extension arms of the U-shaped frame, and are fixedly connected with the U-shaped frame through a plurality of fasteners.

5. A small diameter automatic welding device, comprising: A frame, a clamping mechanism arranged on the frame, and a girth welder, characterized in that: the welding torch in the girth welder is arranged on the rotating structure of the girth welder through an AVC-OSC device, and the AVC-OSC device is an AVC-OSC device according to any one of claims 1 to 4; the shell of the AVC-OSC device is fixedly installed on the rotating structure of the girth welder, the welding torch is fixedly installed on the mounting seat of the AVC-OSC device through a base, and the welding torch, the base, and the AVC-OSC device form a semi-enclosed C-shaped structure; when a pipe to be welded is clamped in the clamping mechanism, the pipe to be welded is located in the hollow area of ​​the C-shaped structure, the tungsten electrode tip in the welding torch faces the girth of the pipe to be welded, and a baffle opposite to the tungsten electrode tip in the welding torch is fixedly arranged on the shell of the AVC-OSC device.

6. The small-diameter automatic welding equipment according to claim 5 is characterized in that: The clamping mechanism is composed of two pipe clamping mechanisms; the two pipe clamping mechanisms are respectively located above and below the girth welder; The structure of each pipe clamping mechanism includes: a fixed clamping jaw and a movable clamping jaw; the fixed clamping jaw is composed of a fixed connecting arm and a fixed gripping portion located at the front end of the fixed connecting arm, and a first hinged arm is arranged at the front end of the fixed connecting arm; the movable clamping jaw is composed of a movable connecting arm and a movable gripping portion located at the front end of the movable connecting arm, and a second hinged arm is arranged at the front end of the movable connecting arm; the first hinged arm and the second hinged arm are hingedly connected, and a swinging structure is arranged between the fixed connecting arm and the movable connecting arm to drive the movable connecting arm to swing around the hinge point between the first hinged arm and the second hinged arm, so that the movable gripping portion approaches or moves away from the fixed gripping portion; The clamping opening of the fixed clamping part and / or the clamping opening of the movable clamping part is a V-shaped clamping opening.

7. The small diameter automatic welding equipment according to claim 6 is characterized in that: The swing structure includes: a second screw and a movable block; a circle of annular groove is provided on the head of the second screw, a handle is fixedly installed at the tail of the second screw, a threaded hole is provided in the movable block, and the movable block is screwed on the second screw through the threaded hole; one end of the connecting rod is hinged to the rear end of the movable connecting arm, and the other end of the connecting rod is hinged to the movable block; a mounting hole and two limiting threaded holes are provided on the fixed connecting arm, and after the head of the second screw is extended into the mounting hole, two limiting screws are respectively screwed into the corresponding limiting threaded holes, and the two limiting screws screwed into the corresponding limiting threaded holes are stuck in the annular groove.

8. The small diameter pipe automatic welding equipment according to claim 7 is characterized in that: The fixed connecting arm, the fixed clamping part and the first hinged arm are an integral structure formed by integral molding, and the movable connecting arm, the movable clamping part and the second hinged arm are an integral structure formed by integral molding; The movable connecting arm is formed by a first straight rod and a first U-shaped connecting frame located at the rear end of the first straight rod; the connecting rod is formed by a second straight rod and a second U-shaped connecting frame located at the rear end of the second straight rod; the second straight rod extends into the two first extension arms of the first U-shaped connecting frame and is hingedly connected to the two first extension arms of the first U-shaped connecting frame; the movable block extends into the two second extension arms of the second U-shaped connecting frame and is hingedly connected to the two second extension arms of the second U-shaped connecting frame.

9. The small diameter automatic welding equipment according to claim 6, 7 or 8, characterized in that: The frame is integrally formed by an upper mounting arm, a lower mounting arm, and a middle connecting arm connecting the upper mounting arm and the lower mounting arm to form a U-shaped frame structure; the fixed connecting arm of the pipe clamping mechanism located above the girth welder is the upper mounting arm of the frame, and the fixed connecting arm of the pipe clamping mechanism located below the girth welder is the lower mounting arm of the frame; the girth welder is fixed on the lower mounting arm of the frame.

10. The small diameter automatic welding equipment according to claim 6, 7 or 8, characterized in that: The fixed clamping part is composed of a first connection seat and a plurality of first clamping blocks of different heights, and any first clamping block can be fixed to the first connection seat by a plurality of first fastening screws; the movable clamping part is composed of a second connection seat and a plurality of second clamping blocks of different heights, and any second clamping block can be fixed to the second connection seat by a plurality of second fastening screws; The gripping opening of each first gripping block and / or the gripping opening of each second gripping block is a V-shaped gripping opening.

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