Flange welding tool

Abstract

The utility model relates to a flange welding tool which comprises a first bearing frame, the upper end portion of the first bearing frame is provided with a bearing disc, the upper end portion of the bearing disc is provided with a lower positioning piece used for a pipe and a flange and at least two annularly-arranged clamping jaws, jaw bodies of the clamping jaws are hinged to the bearing disc, and the clamping jaws are provided with jaw heads used for being connected with the flange in a pressing mode. The claw tail of the clamping claw is hinged to the first end of a connecting rod, the second end of the connecting rod is hinged to a movable disc, and the movable disc is installed at the movable end of a first linear driving device. The clamping device is simple and compact in structure, a workpiece to be welded can be reliably clamped, movable parts and positioning parts on the tool can be shielded in the welding process, welding seeds are prevented from adhering, the service life of the tool can be prolonged, the precision of the tool can be improved, and the consistency of products can be guaranteed.

Description

Technical Field

[0001] The utility model relates to a molding device, in particular to a flange welding tool. Background Art

[0002] The automobile exhaust system includes pipe fittings and flanges at the ends of the pipe fittings. The flanges are used to dock with flanges of other pipe fittings or to connect with the exhaust port of the engine. Conventional welding of flanges and pipe fittings is usually performed on welding tools. Existing welding tools usually perform welding operations after positioning the pipe fittings and flanges. In the current welding method, the workpiece is matched with a positioning block with an elbow clamp, and the elbow clamp is manipulated to bring the positioning block for the pipe fitting and the positioning block for the flange closer together, and an annular welding groove is formed at the joint. During the welding process, there is splashing of metal liquid, and the splashing droplets adhere to the elbow clamp and the positioning piece to form weld seeds, which affect the positioning accuracy of the positioning piece. At the same time, weld seeds are easily formed at the movable joints of the elbow clamp, etc., which affect the movement of the elbow clamp, and the mating surfaces at the movable joints are damaged, the guiding accuracy is reduced, and wear is formed. At the same time, when this method is used, the clamping force of the elbow clamp is small during the welding process. During the welding process, the deformation caused by thermal stress leads to deformation during the welding process, and the consistency of the welded workpiece is poor, and the qualified rate is low. Summary of the invention

[0003] The purpose of the utility model is to provide a flange welding tool in view of the deficiencies in the prior art. The tool has a simple and compact structure and can reliably clamp the workpiece to be welded. During the welding process, the movable parts and positioning parts on the tool can be shielded to prevent welding seeds from adhering, thereby improving the service life and precision of the tool and ensuring the consistency of the product.

[0004] The purpose of the utility model is achieved in this way: a flange welding tool, comprising:

[0005] A first support frame has a support plate at its upper end, and a lower positioning member for the pipe and the flange is arranged at the upper end of the support plate.

[0006] At least two annularly arranged clamping jaws, wherein the clamping jaws have a jaw body hinged on the supporting plate, the clamping jaws have a jaw head for crimping a flange, the jaw tail of the clamping jaws is hinged to the first end of the connecting rod, the second end of the connecting rod is hinged to the movable plate, and the movable plate is mounted on the movable end of the first linear drive device;

[0007] A second support frame is mounted on the base of the first support frame, the second support frame has a transverse support member extending transversely, a shaft sleeve extending vertically is arranged on the transverse support member, a retractable core rod is slidably fitted in the shaft sleeve, and an upper positioning member for positioning the pipe fitting is arranged on the lower hanging end of the core rod;

[0008] The protective cover is cylindrical and has a first barrel section covering the outer side of the upper positioning member and a second barrel section covering the outer side of the core rod. A gap for inserting the pipe is reserved between the inner hole wall of the first barrel section and the fourth positioning cylindrical surface outside the upper positioning member. The transition shoulder between the first barrel section and the second barrel section is connected to the upper positioning member. A gap for inserting the sleeve is reserved between the inner hole wall of the second barrel section and the outer side of the sleeve.

[0009] The base is provided with a pair of vertical plates and a lower supporting plate, and the two ends of the lower supporting plate are respectively connected to the vertical plates, and the driving end of the first linear driving device installed at the bottom of the lower supporting plate passes through the through hole on the lower supporting plate, and a pair of guide columns are symmetrically arranged on the upper side of the lower supporting plate about the axis of the core rod, and the guide columns are connected to the movable disk, and the guide columns are slidably matched with the guide sleeves correspondingly arranged on the lower supporting plate, and a downward-folded shielding plate is arranged on the corresponding guide column on the lower supporting plate, and the shielding plate is matched with the side clearance of the lower supporting plate.

[0010] A movable pin capable of radially floating is arranged on the shaft sleeve, and a recess is arranged on the outer wall of the lower end of the core rod, and the recess is used to accommodate the end of the movable pin.

[0011] The movable pin includes a seat body, which is threadedly connected to the radial hole of the sleeve. The front end of the seat body supports a steel ball through a spring so that the steel ball has a tendency to move radially inward. The steel ball is located in the radial hole of the sleeve, and the protective cover is provided with a strip groove for making way for the outer end of the seat body.

[0012] The support plate is provided with a first lower positioning member and two second lower positioning members, the first lower positioning member is columnar, the core rod and the first lower positioning member are coaxially arranged, the second lower positioning member is a positioning pin, each clamping claw is correspondingly provided with each positioning pin, and the positioning pin is located on the extension line of the flipping track of the claw head,

[0013] The support plate is provided with a recessed hole for installing the first lower positioning member. The outer circumference of the first lower positioning member is provided with a first guide cone surface, a first annular positioning shoulder, and a second annular positioning shoulder from top to bottom. The first guide cone surface and the first annular positioning shoulder are transitioned through a first positioning cylindrical surface.

[0014] The upper positioning member is columnar, and a second guide cone surface, a fourth positioning cylindrical surface and a third positioning annular end surface are sequentially arranged on the outer circumference of the upper positioning member from bottom to top, and a transition shoulder is connected to the upper end surface of the upper positioning member.

[0015] The claw head is connected to the claw body through bolts. An adjusting gasket is arranged at the connection between the claw head and the claw body. The adjusting gasket has a slot for making way for the bolt.

[0016] The protective cover is made of copper.

[0017] A second linear drive device is arranged at the upper end of the transverse support member, and a movable end of the second linear drive device passes downward through a through hole of the transverse support member and is connected to the core rod.

[0018] The first linear drive device is a pneumatic cylinder, a hydraulic cylinder or an electric cylinder, and the second linear drive device is a double-headed pneumatic cylinder. A bracket is arranged on the double-headed cylinder, and the bracket is hinged to the second hinge hole on the handle through a rotating pin. The upper end of the piston rod of the second linear drive device is connected to the first hinge hole on the handle, and the first hinge hole or the second hinge hole is a bar hole.

[0019] The above scheme has the following beneficial effects: the first support frame is used to fix the support plate and the positioning member. The flange is positioned by the lower positioning member to ensure the position accuracy during the welding process. The flange can be pressed after being positioned by at least two ring-arranged clamping jaws to facilitate welding operations. The far end of the movable plate can drive the connecting rod to move, and then drive the clamping jaw to swing, so as to achieve the clamping state and the opening state of the clamping jaw. The linear drive device can realize the movement of the movable plate and provide the power for the opening and closing of the clamping jaw. The second support frame is installed on the base of the first support frame, so that the relative position of the second support frame and the first support frame can be stabilized. The shaft sleeve on the transverse support member can limit the core shaft so that it can slide in the axial direction. The upper positioning member can be moved by the extension and contraction of the core rod, and then the pipe fitting can be pressed and loosened to meet the operation requirements. During welding operation, splashed metal droplets are easily adhered to the surface of the tooling, which has very strong adhesion. The protective cover can effectively protect the outer surface of the core rod, prevent splashed welding seeds from adhering to the core rod, and avoid failures such as the core rod being stuck. When the protective cover moves upward with the core rod, the sleeve is relatively inserted into the gap between the protective cover and the core rod. The exposed part of the core rod is always under the shielding of the protective cover. At the same time, it has an upper positioning piece, which requires higher positioning accuracy. The adhered welding seeds can affect the accuracy of the positioning surface. Through the shielding of the protective cover, it can effectively prevent the surface of the positioning surface from being damaged during the welding process. The utility model can be used to quickly and reliably pre-install the pipe fittings and flanges before welding. At the same time, during the welding process, it can effectively protect the sliding fit of the core rod and the surface of the positioning piece to prevent damage by the splashed liquid, so that it can always have a higher welding accuracy during the welding operation, so that the consistency of the product is higher, and the qualified rate of the product is improved.

[0020] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2This is a front view of the utility model in the welding state;

[0023] Figure 3 for Figure 2 Middle AA section view;

[0024] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0025] Figure 5 It is an axonometric schematic diagram of the utility model in the welding state.

[0026] In the accompanying drawings, 100 is a first support frame, 101 is a base, 110 is a support plate, 111 is a sleeve, 112 is a first lower positioning member, 113 is a second lower positioning member, 120 is a clamping claw, 121 is a claw head, 122 is a claw tail, 130 is a connecting rod, 140 is a movable disk, 150 is a first linear drive device, 160 is a second linear drive device, 170 is a movable pin, 171 is a spring, 172 is a steel ball, 173 is a seat body, 200 is a second support frame, 210 is a transverse support member, 211 is a recess, 220 is a core rod, 23 0 is an upper positioning member, 231 is a second guide cone surface, 232 is a fourth positioning cylindrical surface, 233 is a third positioning annular end surface, 300 is a protective cover, 301 is a strip groove, 310 is a first barrel section, 320 is a second barrel section, 330 is a transition shoulder, 362 is a handle, 1011 is a vertical plate, 1012 is a lower support plate, 1013 is a guide column, 1014 is a shielding plate, 1112 is a first annular positioning shoulder, 1111 is a second annular positioning shoulder, 1113 is a first guide cone surface, 1114 is a first positioning cylindrical surface, and 500 is a welding gun. DETAILED DESCRIPTION

[0027] With reference to the accompanying drawings, specific embodiments of the present invention will be described in detail.

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can be used to explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more. It should be noted that in practical applications, due to the limitations of equipment accuracy or installation errors, absolute parallel or perpendicular effects are difficult to achieve. The description of vertical, parallel or same direction in this application is not an absolute limiting condition, but means that a vertical or parallel structural setting can be achieved within a preset error range and the corresponding preset effect can be achieved. In this way, the technical effect of the limited features can be maximized, and the corresponding technical solution can be easy to implement and has high feasibility.

[0030] See also Figures 1 to 5 , an embodiment of a flange welding tool, a flange welding tool, comprising a first support frame 100, a second support frame 200 and a protective cover 300, the first support frame 100, a support plate 110 is arranged at its upper end, the upper end of the support plate 110 is provided with a lower positioning member for a pipe and a flange, at least two annularly arranged clamping jaws 120, in this embodiment, four annularly arranged clamping jaws 120 are provided, the claw body of the clamping jaw 120 is hinged on the support plate 110, the clamping jaw 120 has a claw head 121 for crimping a flange, and the claw tail 122 of the clamping jaw 120 is connected to the flange. The first end of the connecting rod 130 is hinged, and the second end of the connecting rod 130 is hinged to the movable disk 140, and the movable disk 140 is installed on the movable end of the first linear drive device 150; the second support frame 200 is installed on the base 101 of the first support frame 100, and the second support frame 200 has a transversely extending transverse support member 210, and a vertically extending shaft sleeve 111 is arranged on the transverse support member 210, and a retractable core rod 220 is slidably fitted in the shaft sleeve 111, and an upper positioning member 230 for positioning the pipe fitting is arranged on the lower hanging end of the core rod 220;

[0031] The protective cover 300 is cylindrical, and has a first barrel section 310 covering the outer side of the upper positioning member 230 and a second barrel section 320 covering the outer side of the core rod 220. A gap for inserting a pipe is reserved between the inner hole wall of the first barrel section 310 and the fourth positioning cylindrical surface 232 on the outer side of the upper positioning member 230. The transition shoulder 330 between the first barrel section 310 and the second barrel section 320 is connected to the upper positioning member. A gap for inserting the sleeve 111 is reserved between the inner hole wall of the second barrel section 320 and the outer side of the sleeve 111. Further, the protective cover 300 is made of copper, and the material is different from the welding material. At the same time, copper has good heat dissipation performance. When welding, the splashed welding seeds are not easy to adhere. Further, the upper positioning member 230 is columnar, and the outer circumference of the upper positioning member 230 is sequentially provided with a second guide cone surface 231, a fourth positioning cylindrical surface 232 and a third positioning annular end surface 233 from bottom to top, and the transition shoulder 330 is connected to the upper end surface of the upper positioning member 230.

[0032] In some embodiments, a second linear drive device 160 is disposed at the upper end of the transverse support member 210, and a movable end of the second linear drive device 160 passes downward through a through hole of the transverse support member 210 and is connected to the core rod 220, and the axial reciprocating motion of the core rod 220 can be manipulated by the second linear drive device 160. Further, the first linear drive device 150 is a cylinder, a hydraulic cylinder, or an electric cylinder. The second linear drive device 160 is a double-headed cylinder, on which a bracket is arranged, and the bracket is hinged to the second hinge hole on the handle 362 through a rotating pin, and the upper end of the piston rod of the second linear drive device 160 is connected to the first hinge hole on the handle 362, and the first hinge hole or the second hinge hole is a strip hole, one end of the double-headed cylinder is connected to the core rod 220, and the other end of the double-headed cylinder is connected to the handle, and the handle can be used to achieve manual tightening during pre-installation, and then the core rod 220 is driven downward by the cylinder to tighten the workpiece. After the operation is completed, the positioning piece can be quickly withdrawn through the cylinder to facilitate the removal of the workpiece.

[0033] The pipe and the flange are positioned by the lower positioning member to ensure the position accuracy of the welding. In some embodiments, the support plate 110 may be provided with a first lower positioning member 112 and two second lower positioning members 113. The first lower positioning member 112 is columnar and is used for centering and positioning the pipe fitting. The core rod 220 is coaxially arranged with the first lower positioning member 112. The second lower positioning member 113 is a positioning pin, which is used to be inserted into the flange connection hole to achieve positioning. Each clamping jaw 120 is provided corresponding to each positioning pin. Located on the extension line of the flipping trajectory of the claw head, the clamp 120 can shield the locating pin and the flange connection hole to prevent metal droplets from splashing onto the locating pin and the flange connection during the welding process. A first annular locating shoulder 1112 and a second annular locating shoulder 1111 are arranged on the outer periphery of the first lower locating member 112. The first annular locating shoulder 1112 is used for axial positioning of the pipe fitting. The first annular locating shoulder 1112 and the second annular locating shoulder 1111 are transitioned through a cylindrical surface, and the second annular locating shoulder 1111 is used for axial positioning of the flange.

[0034] Furthermore, the support plate 110 is provided with a concave hole for installing the first lower positioning member 112, and the outer periphery of the first lower positioning member is provided with a first guide cone surface 1113, a first annular positioning shoulder 1112, and a second annular positioning shoulder 1111 from top to bottom, and the first guide cone surface 1113 and the first annular positioning shoulder 1112 are transitioned through a first positioning cylindrical surface 1114. The first guide cone surface 1113 is used for guidance, so as to facilitate quick assembly.

[0035] The base 101 is provided with a pair of vertical plates 1011 and a lower supporting plate 1012. The two ends of the lower supporting plate 1012 are respectively connected to the vertical plates 1011. The driving end of the first linear driving device 150 installed at the bottom of the lower supporting plate 1012 passes through the through hole on the lower supporting plate. The first linear driving device 150 can be a cylinder, a hydraulic cylinder or an electric cylinder. In this embodiment, the second linear driving device 160 is a cylinder. A pair of guide pillars 1013 are symmetrically arranged on the upper side of the lower supporting plate 1012 about the axis of the core rod 220. By setting the guide pillars 1013, the guiding accuracy can be improved. The guide pillars 1013 are connected to the movable disk 140. The guide pillars 1013 are slidably matched with the guide sleeves correspondingly arranged on the lower supporting plate 1012. A downward-folded shielding plate 1014 is arranged on the lower supporting plate 1012 corresponding to the guide pillars 1013. The shielding plate 1014 is matched with the side clearance of the lower supporting plate 1012. The guide pillars 1013 can be shielded by the shielding plate 1014 to prevent splashing welding seeds from adhering to the guide pillars 1013 and rendering the guide pillars 1013 ineffective.

[0036] In some embodiments, a radially floating movable pin 170 is provided on the sleeve 111, and a recess 211 is provided on the outer wall of the lower end of the core rod 220. The recess 211 may be in the shape of a hole or a groove. In this embodiment, the recess 211 is in the shape of an annular groove. The recess 211 is used to accommodate the end of the movable pin 170. When the movable pin 170 is clamped in the recess 211, the axial movement of the core rod 220 is blocked. When the pipe is pre-installed, the core rod 220 can stay in a higher position, with a larger pre-installation space, which is convenient for operation. When the core rod 220 is subjected to a downward thrust, the core rod 220 can move downward. Furthermore, the movable pin 170 includes a seat body 173, which is threadedly connected to the radial hole of the sleeve 111. The front end of the seat body 173 supports a steel ball 172 through a spring 171, so that the steel ball 172 has a tendency to move radially inward. The steel ball 172 is located in the radial hole of the sleeve 111, and the protective cover 300 is provided with a strip groove 301 for making way for the outer end of the seat body 173. With this structure, the steel ball 172 has a smaller friction force, and can always be close to the outer wall of the core rod 220 through the spring 171, and can slide relative to the core rod 220. After sliding into the recess 211, it can be retained in the recess 211, and the core rod 220 can continue to maintain a stable position. When the core rod 220 is subjected to force, the recess 211 compresses the steel ball 172 to overcome the elastic force and retract, thereby releasing the lock on the core rod 220. In particular, when the core rod 220 is used in conjunction with a pneumatic cylinder, a hydraulic cylinder or an electric telescopic cylinder, the core rod 220 can maintain a stable position without consuming energy.

[0037] In some embodiments, the claw head 121 is connected to the claw body by bolts, and an adjusting gasket is arranged at the connection between the claw head 121 and the claw body. The adjusting gasket has a slot for making room for the bolt. With this structure, the claw head 121 can be raised higher after being worn; by adjusting the gasket, it can also be adjusted in the case of slight wear to compensate for the positioning position of the claw head 121. The slot can be arranged so that the gasket can be replaced when the bolt is removed.

[0038] When the flange is welded by adopting the above scheme, the flange is fixed by the lower positioning member, and the movable disk 140 moves upward to press the opened clamping jaws 120 against the back of the flange. When the two ends of the connecting member are located on the same radial extension line, the connecting rod 130 is located at the dead point position to form a locking structure, which applies a large force to the claw head, so that the flange can be effectively clamped during the welding process. The pipe fitting is inserted into the flange hole, and the positioning of the lower end is achieved through the transition of the first annular positioning shoulder 1111 and the first positioning cylindrical surface 1114. The upper positioning member 230 is pressed against the upper end of the pipe fitting through the handle, and the double-headed cylinder is supplied with air to press the upper positioning member against the pipe fitting. The welding groove formed between the flange and the pipe fitting is welded using the welding gun 500. After welding is completed, the upper positioning member 230 and the claw head are respectively released from the workpiece by moving the core rod 220 upward and the movable disk 140 back, so that the workpiece is easily removed and the welding operation is completed.

[0039] By adopting the above scheme, during the welding operation, the protective cover 300 can effectively protect the outer surface of the core rod 220, prevent the splashing welding seeds from adhering to the core rod 220, and avoid failures such as the core rod 220 being stuck. When the protective cover 300 moves upward with the core rod 220, the sleeve 111 is relatively inserted into the gap between the protective cover 300 and the core rod 220, and the exposed part of the core rod 220 is always under the shielding of the protective cover 300. Through the shielding of the protective cover 300, it can also effectively prevent the metal droplets from damaging the positioning surface of the positioning part during the welding process. By adopting the utility model, the pipe fittings and flanges can be quickly and reliably pre-assembled before welding. At the same time, during the welding process, the sliding-fitting core rod 220 and the surface of the positioning part can be effectively protected to prevent damage by the splashing liquid, so that it can always have a high welding accuracy during the welding operation, so that the consistency of the product is high, and the qualified rate of the product is improved.

[0040] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and their equivalents, the utility model is also intended to include these modifications and variations.

Claims

1. A flange welding tool, characterized in that: include: A first support frame (100), the upper end of which is provided with a support plate (110), and the upper end of the support plate (110) is provided with a lower positioning piece for the pipe and the flange; At least two clamping jaws (120) are arranged in an annular manner, the jaw bodies of the clamping jaws (120) are hinged on the supporting plate (110), the clamping jaws (120) have a jaw head (121) for crimping a flange, the jaw tail (122) of the clamping jaw (120) is hinged to the first end of a connecting rod (130), the second end of the connecting rod (130) is hinged to a movable plate (140), and the movable plate (140) is mounted on the movable end of a first linear drive device (150); A second support frame (200) is mounted on the base (101) of the first support frame (100), the second support frame (200) having a transversely extending transverse support member (210), a vertically extending shaft sleeve (111) being arranged on the transverse support member (210), a retractable core rod (220) being slidably fitted in the shaft sleeve (111), and an upper positioning member (230) for positioning the pipe fitting being arranged on the lower hanging end of the core rod (220); The protective cover (300) is cylindrical and comprises a first barrel section (310) covering the outer side of an upper positioning member (230) and a second barrel section (320) covering the outer side of a core rod (220); a gap for inserting a pipe is reserved between an inner hole wall of the first barrel section (310) and a fourth positioning cylindrical surface (232) on the outer side of the upper positioning member (230); a transition shoulder (330) between the first barrel section (310) and the second barrel section (320) is connected to the upper positioning member; and a gap is reserved between an inner hole wall of the second barrel section (320) and the outer side of the shaft sleeve (111) for inserting the shaft sleeve (111).

2. The flange welding tool according to claim 1, characterized in that: The base (101) is provided with a pair of vertical plates (1011) and a lower supporting plate (1012), the two ends of the lower supporting plate (1012) are respectively connected to the vertical plates (1011), the driving end of the first linear driving device (150) installed at the bottom of the lower supporting plate (1012) passes through the through hole on the lower supporting plate, and a pair of guide pillars (1013) are symmetrically arranged on the upper side of the lower supporting plate (1012) about the axis of the core rod (220), the guide pillars (1013) are connected to the movable disk (140), the guide pillars (1013) are slidably matched with the guide sleeves correspondingly arranged on the lower supporting plate (1012), and the lower supporting plate (1012) is provided with a downwardly folded shielding plate (1014) corresponding to the upper guide pillar (1013), and the shielding plate (1014) is matched with the side clearance of the lower supporting plate (1012).

3. The flange welding tool according to claim 1, characterized in that: A radially floating movable pin (170) is arranged on the shaft sleeve (111), and a recess (211) is arranged on the outer wall of the lower end of the core rod (220), and the recess (211) is used to accommodate the end of the movable pin (170).

4. The flange welding tool according to claim 3, characterized in that: The movable pin (170) comprises a seat body (173), the seat body (173) is threadedly connected in the radial hole of the shaft sleeve (111), the front end of the seat body (173) supports a steel ball (172) through a spring (171), so that the steel ball (172) has a tendency to move radially inward, and the steel ball (172) is located in the radial hole of the shaft sleeve (111), and the protective cover (300) is provided with a strip groove (301) for making way for the outer end of the seat body (173).

5. The flange welding tool according to claim 1, characterized in that: A first lower positioning member (112) and two second lower positioning members (113) are arranged on the support plate (110); the first lower positioning member (112) is columnar; the core rod (220) and the first lower positioning member (112) are coaxially arranged; the second lower positioning member (113) is a positioning pin; each clamping claw (120) is arranged corresponding to each positioning pin; and the positioning pin is located on an extension line of the flipping trajectory of the claw head.

6. The flange welding tool according to claim 5, characterized in that: The support plate (110) is provided with a recessed hole for mounting the first lower positioning member (112); the outer periphery of the first lower positioning member is provided with a first guide conical surface (1113), a first annular positioning shoulder (1112), and a second annular positioning shoulder (1111) from top to bottom; the first guide conical surface (1113) and the first annular positioning shoulder (1112) are transitioned via a first positioning cylindrical surface (1114).

7. The flange welding tool according to claim 5, characterized in that: The upper positioning member (230) is columnar, and a second guide cone surface (231), a fourth positioning cylindrical surface (232) and a third positioning annular end surface (233) are sequentially arranged on the outer circumference of the upper positioning member (230) from bottom to top, and a transition shoulder (330) is connected to the upper end surface of the upper positioning member (230).

8. The flange welding tool according to claim 1, characterized in that: The claw head (121) is connected to the claw body by means of bolts, and an adjusting gasket is arranged at the connection between the claw head (121) and the claw body, wherein the adjusting gasket has a slot for making way for the bolt.

9. The flange welding tool according to claim 1, characterized in that: The protective cover (300) is made of copper.

10. The flange welding tool according to claim 1, characterized in that: A second linear drive device (160) is arranged at the upper end of the transverse support member (210), and the movable end of the second linear drive device (160) passes downward through the through hole of the transverse support member (210) and is connected to the core rod (220). The second linear drive device (160) is a double-headed cylinder, and a bracket is arranged on the double-headed cylinder. The bracket is hinged to the second hinge hole on the handle (362) through a rotating pin. The upper end of the piston rod of the second linear drive device (160) is connected to the first hinge hole on the handle (362), and the first hinge hole or the second hinge hole is a strip hole; the first linear drive device (150) is a cylinder, a hydraulic cylinder or an electric cylinder.

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