Detection jig for welding small balls

Abstract

The utility model discloses a welding ball detection jig, belongs to the technical field of automobile plate welding ball detection tools, and solves the problems that in the prior art, the detection effect is unstable, product quality judgment is affected, and a common tool is tedious in operation, high in labor intensity and poor in practicability. Comprising a jig outer sleeve, a rotating shaft core is inserted into a middle through cavity of the jig outer sleeve, a thrust ball bearing is arranged between the rotating shaft core and the jig outer sleeve, a constant-torque shaft core is arranged at the rear end of the rotating shaft core, and the driving end of the constant-torque shaft core is connected with a rotating driving device; the front end of the rotating shaft core is connected with the clamping detection assembly, the clamping detection assembly is arranged in the jig outer sleeve in a telescopic mode through the locking end cover, a small welding ball clamping cavity in the front end of the clamping detection assembly extends to the outer side of the front end of the jig outer sleeve, and a holding positioning handle is arranged on the outer wall of the jig outer sleeve. The device is reasonable in design, compact in structure, convenient to operate, capable of effectively improving the detection efficiency, stable in detection effect, high in quality judgment accuracy and high in practicability.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile panel welding ball detection tool, concretely relates to a welding ball detection fixture. BACKGROUND

[0002] The quality detection of automobile panel welding ball is currently directly carried out through fixed value torque wrench. However, since there is no suitable tooling for matching detection, the effect of welding ball detection is unstable, and the determination of product quality is affected. Moreover, the operation of the existing ordinary tooling is complicated, the labor intensity is large, and the practicality is poor. Therefore, it is necessary to improve the welding ball detection tool of the prior art. UTILITY MODEL CONTENTS

[0003] The utility model is directly aimed at the above problems, and provides a welding ball detection fixture which is convenient to operate, can effectively improve detection efficiency, stable in detection effect, high in accuracy of quality determination and strong in practicality.

[0004] The utility model adopts the technical scheme that the welding ball detection fixture includes fixture outer cover, and is characterized in that: a rotating shaft core is inserted and connected in the middle cavity of the fixture outer cover, a thrust ball bearing is arranged between the rotating shaft core and the inner wall of the fixture outer cover, a fixed torque shaft core is arranged at the rear end of the rotating shaft core outside the fixture outer cover, and the driving end of the fixed torque shaft core is connected with a rotary drive device; the front end of the rotating shaft core inside the cavity of the fixture outer cover is also connected with a clamping detection assembly, the clamping detection assembly is arranged in the inside of the fixture outer cover in a telescopic mode, the welding ball clamping cavity at the front end of the clamping detection assembly extends to the outside of the front end of the fixture outer cover through the through hole in the middle of the locking end cover, and a holding positioning handle is arranged on the outer wall of the fixture outer cover in a radial direction.

[0005] The fixture outer cover includes an outer cover main body, an axial shaft core insertion hole is arranged in the inside of the outer cover main body, one end of the shaft core insertion hole at the rear part of the outer cover main body is connected with a bearing mounting groove, and one end of the shaft core insertion hole at the front part of the outer cover main body is connected with a detection assembly insertion and telescopic groove, a spring positioning clamping groove is arranged on the inner wall of the bearing mounting groove, and an end cover connecting external thread is arranged on the outer wall of the front end of the outer cover main body and used for matched connection with the internal thread of the locking end cover. The rotating shaft core is inserted and arranged in the shaft core insertion hole of the outer cover main body, the thrust ball bearing is arranged in the bearing mounting groove and sleeved at the rear end of the rotating shaft core, and the inner snap spring of the baffle ring is arranged in the spring positioning clamping groove; meanwhile, the front end of the rotating shaft core is movably connected with the end part of the clamping detection assembly which is inserted and arranged in the detection assembly insertion and telescopic groove, and the locking end cover is screw-connected with the front end of the outer cover main body.

[0006] The fixed torque shaft core is provided with a shaft core connecting screw at one end for connecting with the rotating shaft core, and a rotating drive hexagonal prism at the other end for connecting with the rotating drive device.

[0007] The rotating shaft core comprises a rotating shaft body, one end of the rotating shaft body is provided with a shaft core connecting screw hole for connecting with the fixed torque shaft core, the other end of the rotating shaft body is provided with a detection assembly connecting screw for connecting with the clamping detection assembly, and the middle part of the rotating shaft body is further provided with a bearing limiting flange. The rotating shaft body is connected with the end of the fixed torque shaft core by the shaft core connecting screw hole, and the end of the clamping detection assembly inserted into the main body of the sleeve is connected with the detection assembly connecting screw by the detection assembly connecting screw, and the bearing limiting flange in the middle part of the rotating shaft body is used to position the thrust ball bearing.

[0008] The clamping detection assembly comprises an inserted telescopic body, the rear end of the inserted telescopic body is provided with a detection assembly connecting screw hole for cooperating with the detection assembly connecting screw at the front end of the rotating shaft core, the lower side of the front end of the inserted telescopic body is provided with a fixed clamping seat, the upper side of the fixed clamping seat is provided with a movable clamping seat, and an opening and closing short shaft is arranged between the middle part of the movable clamping seat and the fixed clamping seat, a welding small ball clamping cavity is arranged between the front of the opening and closing short shaft and the two clamping seats, an opening and closing elastic ring is further sleeved on the rear of the opening and closing short shaft and the outer side of the two clamping seats, and the outer dimension of the movable clamping seat and the fixed clamping seat after being closed to each other is not greater than the outer diameter of the inserted telescopic body; an axial telescopic guide groove is further arranged on the outer side wall of the inserted telescopic body, and a guide clamping protrusion is fixedly arranged in the inside of the jig sleeve for cooperating with the telescopic guide groove. The inserted telescopic body is movably inserted into the detection assembly inserted telescopic groove of the jig sleeve, and the rear end of the inserted telescopic body is connected with the detection assembly connecting screw at the front end of the rotating shaft core by the detection assembly connecting screw hole; and during the rotation of the rotating shaft core with the rotating drive device, the straight reciprocating motion of the entire clamping detection assembly in the detection assembly inserted telescopic groove of the jig sleeve is realized by the cooperation of the guide clamping protrusion and the telescopic guide groove, so that the closing and opening of the movable clamping seat around the axis of the opening and closing short shaft is realized, and the detection and clamping of the welding small ball on the plate are facilitated.

[0009] The fixed clamping seat and the movable clamping seat are semi-cylindrical symmetrical structures. A short shaft mounting groove is provided in the middle of the upper side of the fixed clamping seat and the lower side of the movable clamping seat. An elastic ring mounting groove is provided on the rear side of the short shaft mounting groove, and a small ball receiving groove is provided on the front side of the short shaft mounting groove. A small ball clamping opening is provided at the front end of the small ball receiving groove. The opening and closing short shaft is arranged between the short shaft mounting grooves of the fixed clamping seat and the movable clamping seat, and the opening and closing elastic ring is fitted into the elastic ring mounting groove of the fixed clamping seat and the movable clamping seat. Simultaneously, the small ball clamping opening of the fixed clamping seat and the movable clamping seat is used to clamp the welded small ball to be tested for inspection. Furthermore, during the traction process of inspection, the welded small ball that is pulled off can be temporarily stored in the cavity formed by the small ball receiving groove of the fixed clamping seat and the movable clamping seat.

[0010] The rear end of the movable clamping seat is provided with an opening avoidance ramp for avoiding the structure behind it. When the movable clamping seat extends from the front end of the jig outer sleeve and opens by the elastic force of the opening and closing elastic ring, the opening avoidance ramp at its rear end avoids the structure behind the movable clamping seat and in front of the insertion telescopic body, thereby effectively avoiding interference during the opening and closing process.

[0011] The outer wall of the fixture outer casing is provided with a handle connection through hole. The grip positioning handle is connected to the handle connection through hole via a handle connecting part. Furthermore, the guide snap-fit ​​protrusion is provided at one end of the handle connecting part extending into the inner body of the outer casing. This integrates the guide snap-fit ​​protrusion onto the detachable grip positioning handle, thereby facilitating the installation and removal of the entire testing fixture.

[0012] The beneficial effects of this utility model are as follows: Because this utility model uses a fixture outer sleeve with a rotating shaft inserted into its central cavity, a thrust ball bearing is provided between the rotating shaft and the inner wall of the fixture outer sleeve, and a torsion shaft is provided at the rear end of the rotating shaft located outside the fixture outer sleeve, with the drive end of the torsion shaft connected to a rotary drive device; the front end of the rotating shaft located inside the cavity of the fixture outer sleeve is connected to a clamping detection component, which is telescopically installed inside the fixture outer sleeve via a locking end cap. The welding ball clamping cavity at the front end of the clamping detection component extends to the outer side of the front end of the fixture outer sleeve via a through hole in the middle of the locking end cap, and a gripping positioning handle is provided on the outer wall of the fixture outer sleeve. Therefore, its design is reasonable, its structure is compact, its operation is convenient, it can effectively improve detection efficiency, its detection effect is stable, its quality judgment accuracy is high, and its practicality is strong. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 yes Figure 1 A schematic diagram of an explosive structure.

[0015] Figure 3 is Figure 2 A structural schematic view of the fixed torsion shaft core and the rotating shaft core in the structure.

[0016] Figure 4 is Figure 2 A structural schematic view of the jig cover in the structure.

[0017] Figure 5 is Figure 4 An internal structure cross-sectional view of the structure.

[0018] Figure 6 is Figure 2 A structural schematic view of the clamping detection assembly in the structure.

[0019] Figure 7 is Figure 6 An internal structure cross-sectional view of the structure.

[0020] Figure 8 is Figure 6 A structural schematic view of the fixed clamping seat in the structure.

[0021] Figure 9 is Figure 6 A structural schematic view of the movable clamping seat in the structure.

[0022] Figure 10 is a use state schematic view of the front end of the clamping detection assembly of the utility model extending out of the jig cover, and the movable clamping seat being opened by the elastic force of the opening and closing elastic ring.

[0023] Figure 11 is Figure 10 A use state schematic view of the clamping detection assembly in the structure being retracted into the jig cover, and the movable clamping seat being closed by the extrusion of the inner wall of the detection assembly insertion and extension slot.

[0024] The serial number in the figure is explained: 1, jig cover, 2, rotating shaft core, 3, fixed torsion shaft core, 4, holding positioning handle, 5, locking end cover, 6, clamping detection assembly, 7, small ball clamping cavity, 8, thrust ball bearing, 9, inner snap spring of check ring, 10, rotary drive hexagonal prism, 11, shaft core connecting screw, 12, rotary shaft body, 13, shaft core connecting screw hole, 14, detection assembly connecting screw, 15, bearing limiting flange, 16, cover main body, 17, bearing installation slot, 18, handle connection through hole, 19, end cover connection external thread, 20, shaft core insertion hole, 21, detection assembly insertion and extension slot, 22, snap spring positioning slot, 23, insertion and extension body, 24, fixed clamping seat, 25, movable clamping seat, 26, opening and closing short shaft, 27, opening and closing elastic ring, 28, extension guide slot, 29, detection assembly connecting screw hole, 30, elastic ring installation ring groove, 31, short shaft installation slot, 32, small ball containing groove, 33, small ball clamping port, 34, opening avoidance inclined surface, 35, handle connection part, 36, guide clamping block. DETAILED DESCRIPTION

[0025] According to Figures 1-11 The specific structure of the utility model is explained in detail. The welding ball detection jig comprises a jig outer sleeve 1, the jig outer sleeve 1 is formed by a hollow outer sleeve main body 16, the inside of the outer sleeve main body 16 is provided with an axial core insertion hole 20, a rotating shaft core 2 is inserted and connected in the axial core insertion hole 20 of the jig outer sleeve 1; the one end of the axial core insertion hole 20 at the rear part of the outer sleeve main body 16 is communicated with a bearing mounting groove 17, the bearing mounting groove 17 is provided with a thrust ball bearing 8 sleeved at the rear end of the rotating shaft core 2; and the inner wall of the bearing mounting groove 17 is further provided with a snap spring positioning clamping groove 22. Then, the rotating shaft core 2 is inserted and connected in the axial core insertion hole 20 of the outer sleeve main body 16, the thrust ball bearing 8 is arranged in the bearing mounting groove 17 and sleeved at the rear end of the rotating shaft core 2, and the snap spring 9 for limiting the position of the bearing limiting flange 15 is arranged in the snap spring positioning clamping groove 22.

[0026] The rear end of the rotating shaft core 2 located outside the jig outer sleeve 1 is provided with a fixed torque shaft core 3, and the driving end of the fixed torque shaft core 3 is connected with a rotary driving device. The front end of the rotating shaft core 2 located inside the through cavity of the jig outer sleeve 1 is further connected with a clamping detection assembly 6, the clamping detection assembly 6 is inserted and arranged in a detection assembly insertion and extension groove 21 communicated with the front part of the axial core insertion hole 20 of the jig outer sleeve 1, and the clamping detection assembly 6 is arranged in the inside of the jig outer sleeve 1 through a locking end cover 5, and the inner thread of the locking end cover 5 is connected with the end cover connecting outer thread 19 arranged on the outer wall of the front end of the outer sleeve main body 16. The welding ball clamping cavity 7 at the front end of the clamping detection assembly 6 extends to the outside of the front end of the jig outer sleeve 1 through the through hole in the middle of the locking end cover 5.

[0027] The rotating shaft core 2 is composed of a rotating shaft body 12, one end of the rotating shaft body 12 is provided with a shaft core connecting screw hole 13 for connecting with the shaft core connecting screw rod 11 of the fixed torque shaft core 3, the other end of the rotating shaft body 12 is provided with a detection assembly connecting screw rod 14 for connecting with the detection assembly connecting screw hole 29 of the clamping detection assembly 6, the middle part of the rotating shaft body 12 is further provided with a bearing limiting flange 15. Moreover, one end of the fixed torque shaft core 3 is provided with a shaft core connecting screw rod 11 for connecting with the shaft core connecting screw hole 13 of the rotating shaft core 2, the other end of the fixed torque shaft core 3 is provided with a rotating drive hexagonal prism 10 for connecting with the output end of the rotating drive device. Thus, the rotating shaft body 12 is connected with the shaft core connecting screw rod 11 at the end of the fixed torque shaft core 3 through the shaft core connecting screw hole 13, and the rotating shaft body 12 is threadedly connected with the detection assembly connecting screw hole 29 at the end of the clamping detection assembly 6 inserted and arranged inside the sleeve body 16 through the detection assembly connecting screw rod 14, at the same time, the bearing limiting flange 15 in the middle part of the rotating shaft body 12 is used to position the thrust ball bearing 8; and the rotating drive device (for example, a fixed torque wrench) connected with the rotating drive hexagonal prism 10 of the fixed torque shaft core 3 is used to drive the rotating shaft core 2 to continuously rotate inside the jig sleeve 1, thereby realizing the action of the clamping detection assembly 6.

[0028] The clamping detection assembly 6 includes an inserted and telescopic body 23, the rear end of the inserted and telescopic body 23 is provided with a detection assembly connecting screw hole 29 for cooperating with the detection assembly connecting screw rod 14 at the front end of the rotating shaft core 2, the lower side of the front end of the inserted and telescopic body 23 is provided with a fixed clamping seat 24, the upper side of the fixed clamping seat 24 is provided with a movable clamping seat 25; the fixed clamping seat 24 and the movable clamping seat 25 are symmetrical structures of half cylinders, the middle part of the upper side of the fixed clamping seat 24 and the lower side of the movable clamping seat 25 are respectively provided with a short shaft mounting clamping groove 31, the rear side of the short shaft mounting clamping groove 31 is provided with an elastic ring mounting ring groove 30, the front side of the short shaft mounting clamping groove 31 is further provided with a small ball containing groove 32, and the front end of the small ball containing groove 32 is provided with a small ball clamping opening 33. Moreover, the middle part between the movable clamping seat 25 and the fixed clamping seat 24 is provided with an opening and closing short shaft 26, the front side of the opening and closing short shaft 26 between the two clamping seats is provided with a welded small ball clamping cavity 7, and the rear side of the opening and closing short shaft 26 outside the two clamping seats is further provided with an opening and closing elastic ring 27. Thus, the opening and closing short shaft 26 is arranged between the short shaft mounting clamping grooves 31 of the fixed clamping seat 24 and the movable clamping seat 25, and the opening and closing elastic ring 27 is sleeved in the elastic ring mounting ring groove 30 of the fixed clamping seat 24 and the movable clamping seat 25; and the small ball clamping opening 33 of the fixed clamping seat 24 and the movable clamping seat 25 is used to clamp the welded small ball to be detected for detection; and in the detection process, the welded small ball pulled out can be temporarily stored in the cavity formed by the small ball containing groove 32 of the fixed clamping seat 24 and the movable clamping seat 25.

[0029] In addition, the rear end of the movable clamping seat 25 is provided with an opening avoidance inclined surface 34 for avoiding the structure behind it, so that when the movable clamping seat 25 is extended from the front end of the jig sleeve 1 and opened by the elastic force of the opening and closing elastic ring 27, the opening avoidance inclined surface 34 at the rear end of the movable clamping seat 25 avoids the structure in front of the telescopic body 23 behind the movable clamping seat 25, thereby effectively avoiding interference during opening and closing. In addition, the outer dimension of the movable clamping seat 25 after being closed with the fixed clamping seat 24 is not greater than the outer diameter of the telescopic body 23, so that the closed clamping detection assembly 6 can be smoothly retracted into the detection assembly telescopic slot 21 of the jig sleeve 1.

[0030] At the same time, the outer side wall of the telescopic body 23 of the clamping detection assembly 6 is also provided with an axial telescopic guide groove 28, and the outer wall of the jig sleeve 1 is provided with a radial holding positioning handle 4, which is connected to the handle connecting through hole 18 on the outer side wall of the jig sleeve 1 through a handle connecting part 35. In addition, the end of the handle connecting part 35 is also provided with a guide clamping protrusion 36, one end of which extends into the inside of the sleeve main body 16, and the guide clamping protrusion 36 at the end of the holding positioning handle 4 cooperates with the telescopic guide groove 28 on the clamping detection assembly 6. In addition, the telescopic body 23 is movably inserted into the detection assembly telescopic slot 21 of the jig sleeve 1, and the rear end of the telescopic body 23 is threadedly connected to the detection assembly connecting screw 14 at the front end of the rotating shaft core 2 through the detection assembly connecting screw hole 29. In addition, during the rotation of the rotating shaft core 2 with the rotating drive device, the guide clamping protrusion 36 and the telescopic guide groove 28 cooperate with each other to make the entire clamping detection assembly 6 perform linear reciprocating motion in the detection assembly telescopic slot 21 of the jig sleeve 1, so as to realize the closing and opening of the movable clamping seat 25 around the opening and closing short shaft 26, and facilitate the detection and clamping of the welding ball on the plate. At the same time, the structure of the guide clamping protrusion 36 being integrally arranged on the detachable holding positioning handle 4 can facilitate the installation and disassembly of the entire detection jig.

[0031] The welding ball detection jig uses the rotating shaft core 2 to be inserted and arranged in the shaft core insertion hole 20 of the jig outer sleeve 1, and the thrust ball bearing 8 is arranged in the bearing installation slot 17, and the retainer spring 9 is arranged in the spring positioning slot 22. Then, the rotating shaft core 2 is connected with the shaft core connecting screw 11 at the end of the fixed torque shaft core 3 by using the shaft core connecting screw hole 13, and the rotating shaft core 2 is movably connected with the detection assembly connecting screw hole 29 at the end of the clamping detection assembly 6 arranged in the detection assembly insertion and extension slot 21 of the jig outer sleeve 1 through the detection assembly connecting screw 14 at the end. Moreover, the opening and closing short shaft 26 is arranged between the short shaft installation slot 31 of the fixed clamping seat 24 and the movable clamping seat 25 of the clamping detection assembly 6, and the opening and closing elastic ring 27 is sleeved in the elastic ring installation ring groove 30 of the fixed clamping seat 24 and the movable clamping seat 25; then, the locking end cover 5 is connected with the end cover connecting outer thread 19 at the front end of the jig outer sleeve 1, and the welding ball clamping cavity 7 at the front end of the clamping detection assembly 6 composed of the fixed clamping seat 24 and the movable clamping seat 25 extends to the outside of the front end of the jig outer sleeve 1 through the through hole in the middle of the locking end cover 5.

[0032] Then, the welding ball clamping opening 33 of the fixed clamping seat 24 and the movable clamping seat 25 is used to wrap the welding ball to be detected on the automobile plate; then, the fixed value torque wrench and other rotating driving devices connected with the rotating driving hexagonal column 10 of the fixed torque shaft core 3 are used to drive the rotating shaft core 2 to continuously rotate in the jig outer sleeve 1, and then in the process of rotating the rotating shaft core 2 with the rotating driving device, the clamping detection assembly 6 is linearly retracted into the detection assembly insertion and extension slot 21 of the jig outer sleeve 1 through the thread connection between the rotating shaft core 2 and the insertion and extension body 23 of the clamping detection assembly 6 and the cooperation of the guide clamping protrusion 36 and the extension guide slot 28, and the movable clamping seat 25 is closed around the axis of the opening and closing short shaft 26 by relying on the extrusion of the inner wall of the detection assembly insertion and extension slot 21, and the welding ball on the plate is clamped and pulled for detection by using the force set in advance by the fixed value torque wrench. In addition, in the pulling process of the clamping detection assembly 6 with the rotation of the rotating driving device, the pulled welding ball can be temporarily stored in the cavity formed by the ball containing groove 32 of the fixed clamping seat 24 and the movable clamping seat 25. After the detection is completed, the rotating driving device is driven to rotate reversely, so that the welding ball clamping cavity 7 at the front end of the clamping detection assembly 6 is extended to the outside of the front end of the jig outer sleeve 1 again, and is prepared for the next detection.

Claims

1. A welding pellet detection jig, comprising a jig cover (1), characterized in that: The middle cavity of the tool cover (1) is inserted with a rotating shaft core (2), the rotating shaft core (2) and the inner wall of the tool cover (1) are provided with a thrust ball bearing (8), and the rear end of the rotating shaft core (2) located outside the tool cover (1) is provided with a fixed torque shaft core (3), the driving end of the fixed torque shaft core (3) is connected with a rotary drive device; the front end of the rotating shaft core (2) located inside the cavity of the tool cover (1) is also connected with a clamping detection assembly (6), the clamping detection assembly (6) is arranged inside the tool cover (1) through a locking end cover (5) and a telescopic manner, and the welding ball clamping cavity (7) at the front end of the clamping detection assembly (6) extends to the outside of the front end of the tool cover (1) through the through hole in the middle of the locking end cover (5); the outer wall of the tool cover (1) is provided with a radial holding positioning handle (4).

2. The welded pellet inspection tool of claim 1, wherein: The tool cover (1) comprises a cover body (16), the inside of the cover body (16) is provided with an axial shaft core insertion hole (20), one end of the shaft core insertion hole (20) located at the rear of the cover body (16) is connected with a bearing mounting groove (17), and the other end of the shaft core insertion hole (20) located at the front of the cover body (16) is connected with a detection assembly insertion telescopic groove (21); and the inner wall of the bearing mounting groove (17) is provided with a snap spring positioning clamping groove (22), and the outer wall of the front end of the cover body (16) is also provided with an end cover connecting external thread (19) used for cooperating with the internal thread of the locking end cover (5).

3. The welded pellet inspection tool of claim 1, wherein: One end of the fixed torque shaft core (3) is provided with a shaft core connecting screw rod (11) used for being connected with the rotating shaft core (2), and the other end of the fixed torque shaft core (3) is provided with a rotary drive hexagonal prism (10) used for being connected with a rotary drive device.

4. The welded pellet inspection tool of claim 1, wherein: The rotating shaft core (2) comprises a rotary shaft body (12), one end of the rotary shaft body (12) is provided with a shaft core connecting screw hole (13) used for being connected with the fixed torque shaft core (3), the other end of the rotary shaft body (12) is provided with a detection assembly connecting screw rod (14) used for being connected with the clamping detection assembly (6), and the middle part of the rotary shaft body (12) is also provided with a bearing limiting flange (15).

5. The welded pellet inspection tool of claim 4, wherein: The clamping detection assembly (6) comprises a plug-in telescopic body (23), the rear end of the plug-in telescopic body (23) is provided with a detection assembly connecting screw hole (29) for matched connection with the detection assembly connecting screw (14) of the front end of the rotating shaft core (2), the lower side of the front end of the plug-in telescopic body (23) is provided with a fixed clamping seat (24), the upper side of the fixed clamping seat (24) is provided with a movable clamping seat (25), and the movable clamping seat (25) and the middle part of the fixed clamping seat (24) are provided with an opening and closing short shaft (26), the front of the opening and closing short shaft (26) and between the two clamping seats are provided with a welded small ball clamping cavity (7), the rear of the opening and closing short shaft (26) and the outer side of the two clamping seats are further provided with an opening and closing elastic ring (27), and the outer dimension of the movable clamping seat (25) and the fixed clamping seat (24) after mutual closing is not greater than the outer diameter of the plug-in telescopic body (23); the outer side wall of the plug-in telescopic body (23) is further provided with a telescopic guide groove (28) arranged in the axial direction, and correspondingly, the inside of the jig outer sleeve (1) is fixedly provided with a guide clamping protrusion (36) for matched connection with the telescopic guide groove (28).

6. The welded pellet inspection tool of claim 5, wherein: The fixed clamping seat (24) and the movable clamping seat (25) are symmetrical structures in half-cylinder shape, the middle part of the upper side of the fixed clamping seat (24) and the lower side of the movable clamping seat (25) are respectively provided with a short shaft mounting clamping groove (31), the rear side of the short shaft mounting clamping groove (31) is provided with an elastic ring mounting ring groove (30), and the front side of the short shaft mounting clamping groove (31) is further provided with a small ball containing groove (32), and the front end of the small ball containing groove (32) is provided with a small ball clamping opening (33).

7. The welded pellet inspection tool of claim 5, wherein: The rear end of the movable clamping seat (25) is provided with an opening avoiding inclined surface (34) for avoiding the rear structure.

8. The welded pellet inspection tool of claim 5, wherein: The outer side wall of the jig outer sleeve (1) is provided with a handle connecting through hole (18), the holding positioning handle (4) is connected with the handle connecting through hole (18) through a handle connecting part (35), and the guide clamping protrusion (36) is arranged at one end of the handle connecting part (35) extending into the inside of the outer sleeve main body (16).

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