Ultrasonic weldment detection equipment

Abstract

The utility model relates to ultrasonic weldment detection equipment which comprises a machine body, a probe and a detection groove, the probe is installed at the moving end of the machine body, the detection groove is installed on the machine body, the detection groove is filled with coupling liquid, a tool plate and a leveling assembly are arranged in the detection groove, and the leveling assembly comprises a fixing block, a first long rod bolt, an adjusting rotating block, a locking rotating block and a lifting block. The two opposite sides of the detection groove are each connected with one fixing block, the multiple first long-rod bolts vertically penetrate through the fixing blocks, the lifting blocks are in sliding fit with the first long-rod bolts, the adjusting rotating blocks are rotationally connected to the lifting blocks and are in threaded fit with the first long-rod bolts, and the locking rotating blocks are in threaded fit with the first long-rod bolts and abut against the fixing blocks. A fine adjustment assembly for finely adjusting the angle of the tool plate is arranged on the lifting block, and the tool plate is detachably connected to the fine adjustment assembly. The ultrasonic weldment detection equipment has the effect of improving the detection efficiency of the ultrasonic weldment detection equipment.

Description

Technical Field

[0001] This application relates to the field of weldment inspection technology, and in particular to an ultrasonic weldment inspection device. Background Technology

[0002] Ultrasonic welding inspection equipment mainly utilizes ultrasonic waves to detect internal defects in welded joints, such as cracks, lack of fusion, and incomplete penetration. This equipment uses the characteristic of ultrasonic waves propagating through metals to determine the location, size, and nature of defects through analysis of reflected waves.

[0003] Chinese patent CN118294531A discloses an ultrasonic testing device and method, which includes a water tank, an ultrasonic phased array instrument, a probe, and an XYZ scanning axis. A water-blocking block is installed inside the water tank, and the ultrasonic phased array instrument is fixedly connected to the water-blocking block. The probe is installed on the ultrasonic phased array instrument. The XYZ scanning axis is installed on the water tank, and the probe is fixedly installed on the drive end of the XYZ scanning axis. During testing, automated water immersion testing is used. The ultrasonic waves enter the interior of the brazed water-cooled plate. In unwelded areas, the ultrasonic energy is totally reflected. In well-welded areas, most of the ultrasonic energy can penetrate, and the reflected energy is weak or almost non-existent. In poorly welded areas, different echo heights are displayed according to the welding status. This allows for non-destructive and comprehensive testing of irregularly brazed water-cooled plates, improving testing efficiency. This patent can simultaneously detect over-welding when testing the welded surfaces of fins and bottom plates, as well as the welded surfaces of fins and middle plates, preventing blockage of the fin flow channels.

[0004] Regarding the aforementioned technologies, existing technologies utilize a support fixture placed in a water tank, using water as the ultrasonic transmission medium to inspect weldments mounted on the support fixture. However, since the support fixture is fixedly connected to the water tank, it is impossible to adjust the levelness of the surface to be tested on the weldment. When the probe moves on the surface to be tested, if the surface is not level, the distance between the probe and the surface increases as the probe moves, leading to signal attenuation due to probe bounce. This reduces the accuracy of the measured data, affects the weldment inspection, and lowers the inspection efficiency of the ultrasonic weldment inspection equipment. Utility Model Content

[0005] In order to improve the detection efficiency of ultrasonic welding inspection equipment, this application provides an ultrasonic welding inspection equipment.

[0006] The ultrasonic welding component testing equipment provided in this application adopts the following technical solution:

[0007] An ultrasonic welding component inspection device includes a body, a probe, and a testing tank. The probe is mounted on the movable end of the body, and the testing tank is mounted on the body. The testing tank is filled with a coupling fluid. A fixture plate and a leveling assembly are provided inside the testing tank. The leveling assembly includes a fixing block, a first long rod bolt, an adjusting screw block, a locking screw block, and a lifting block. The fixing block is connected to one on each opposite side of the testing tank. Several first long rod bolts are vertically inserted through the fixing block. The lifting block is slidably fitted onto the first long rod bolt. The adjusting screw block is rotatably connected to the lifting block and threadedly engaged with the first long rod bolt. The locking screw block is threadedly engaged with the first long rod bolt and abuts against the fixing block. A fine-tuning assembly for finely adjusting the corner height of the fixture plate is provided on the lifting block. The fixture plate is detachably connected to the fine-tuning assembly.

[0008] By adopting the above technical solution, during adjustment, the fixture plate is installed on the fine-tuning component. Rotating the adjusting block lowers the lifting block until the fixture plate is submerged in the coupling fluid, ensuring that the weldment to be tested is also located in the coupling fluid and that the two sides of the fixture plate are level. Then, the fine-tuning component is used to level the height of each corner of the fixture plate, allowing the weldment to be tested to be installed on the fixture plate, achieving horizontal installation. First, the leveling component is used to level the two sides of the fixture plate, and then the fine-tuning component is used to level the height of each corner, confining the weldment to be tested to a horizontal fixture plate. This ensures that the detection surface of the weldment is as horizontal as possible, preventing the distance between the probe and the weldment from gradually increasing during probe movement, which could lead to probe signal attenuation. This ensures the data accuracy of the testing equipment, facilitates weldment testing, and improves the testing efficiency of the ultrasonic weldment testing equipment.

[0009] Optionally, the fine-tuning assembly includes a second long bolt, a fine-tuning block, a support base, and a fine-tuning rotary block. The second long bolt is vertically inserted into the fixed block. The lifting block has a lifting groove. The fine-tuning block is slidably fitted in the lifting groove. The fine-tuning rotary block is rotatably connected to the fine-tuning block and threadedly engaged with the second long bolt. The support base is detachably connected to the fine-tuning block. The tooling plate is placed on several of the support bases. The support bases are provided with mounting components that restrict the tooling plate.

[0010] By adopting the above technical solution, when fine-tuning the corner height of the tooling plate, the fine-tuning block is rotated to raise and lower the fine-tuning block, which in turn raises and lowers the support base, so that the corner heights of each tooling plate are aligned. Finally, the tooling plate is fixed on the support base using the installation components, thus realizing the installation of the tooling plate.

[0011] Optionally, the mounting assembly includes a first stabilizing rod, a first connector, and a first pressure block. The support base has a mounting hole, the first stabilizing rod is threaded into the mounting hole, the first connector is connected to the first stabilizing rod and abuts against the support base, the first pressure block is slidably fitted onto the first stabilizing rod, and the first pressure block is provided with a pressure-applying part, which presses the tooling plate.

[0012] By adopting the above technical solution, when installing the tooling plate, the first stabilizing rod is threaded onto the support seat until the first connector abuts against the support seat. Then, the first pressure block is sleeved on the first stabilizing rod until the pressure part presses the tooling plate. At this time, the first pressure block deforms, and the friction between the first pressure block and the first stabilizing rod restricts the movement of the first pressure block, thus realizing the installation of the tooling plate.

[0013] Optionally, the support base is threaded with a support flange, and the tooling plate is located between the pressure application part and the support flange.

[0014] By adopting the above technical solution, the support flange is used to raise the height of the tooling plate, reducing the contact area between the tooling plate and the support base, making it easier to level the tooling plate.

[0015] Optionally, the fixture plate is provided with a plurality of limiting components for restricting the weldment to be tested on the fixture plate, and the fixture plate has a plurality of insertion holes.

[0016] By adopting the above technical solution, the weldment under test is restricted by the limiting component to ensure that the weldment under test will not move during the test.

[0017] Optionally, the limiting component includes a second pressure block, a second stabilizing rod, and a second connector. The second stabilizing rod is inserted into the insertion hole, the second connector is connected to the second stabilizing rod and abuts against the tooling plate, one end of the second pressure block is slidably fitted onto the second stabilizing rod, and the other end presses against the weldment to be tested.

[0018] By adopting the above technical solution, when restricting the weldment under test, the second stabilizing rod is inserted into the insertion hole until the second connector abuts against the tooling plate. Then, the second pressure block is fitted onto the second stabilizing rod. The friction between the second stabilizing rod and the second pressure block restricts the movement of the second pressure block, thus achieving the installation of the weldment under test. This restricting component is suitable for flat weldments under test.

[0019] Optionally, the limiting component includes a clamping seat, a third stabilizing rod, and a third connector. Several clamping seats are placed on the tooling plate. One end of each clamping seat is provided with a clamping block. The clamping block is provided with a supporting inclined surface. A through groove is opened on the clamping seat. The third stabilizing rod passes through the through groove and is threaded into the insertion hole. The third connector is connected to the third stabilizing rod and abuts against the clamping seat. When limiting the weldment to be tested, the weldment to be tested is placed between several of the supporting inclined surfaces.

[0020] By adopting the above technical solution, when restricting the weldment under test, the third stabilizing rod passes through the clamping seat and engages with the threaded connector until the third connector presses against the clamping seat to restrict its movement. Several supporting inclined surfaces further restrict the movement of the weldment under test, thus achieving the installation of the weldment under test. This limiting component is suitable for columnar weldments under test.

[0021] Optionally, the limiting assembly includes a limiting seat, an adjusting rod, and a rotating rod. Several limiting seats are provided on the tooling plate. Each limiting seat has a mounting groove, and a fourth stabilizing rod passes through the mounting groove. A fourth connector is connected to the fourth stabilizing rod, which is threaded into the insertion hole. The fourth connector abuts against the limiting seat. One end of the rotating rod is provided with a locking bolt, which is threaded into the limiting seat. The adjusting rod is threaded into the rotating rod and abuts against the limiting seat. During installation, the workpiece to be tested is placed on several of the rotating rods.

[0022] By adopting the above technical solution, when restricting the weldment under test, the fourth stabilizing rod passes through the restricting seat and engages with the threaded connector until the fourth connector presses against the restricting seat. The weldment under test is then placed on several rotating rods, and the adjusting rod is rotated to adjust the height of various parts of the weldment under test, thus achieving the installation of the weldment under test. This restricting assembly is suitable for weldments with a flat bottom surface and an irregular top surface.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. During adjustment, install the fixture plate on the fine-tuning component. Rotate the adjusting knob to lower the lifting block until the fixture plate is submerged in the coupling fluid. This ensures that the weldment to be tested is also located in the coupling fluid, and that the two sides of the fixture plate are level. Then, use the fine-tuning component to level the height of each corner of the fixture plate, allowing the weldment to be tested to be installed on the fixture plate, achieving horizontal installation of the weldment. First, use the leveling component to level the two sides of the fixture plate, and then use the fine-tuning component to level the height of each corner of the fixture plate. This confines the weldment to be tested to a horizontal fixture plate, ensuring that the detection surface of the weldment is as horizontal as possible. This avoids the phenomenon of probe signal attenuation caused by the gradually increasing distance between the probe and the weldment during probe movement, ensuring the data accuracy of the testing equipment, facilitating the testing of weldments, and improving the testing efficiency of ultrasonic weldment testing equipment. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the ultrasonic welding inspection equipment in Embodiment 1 of this application.

[0026] Figure 2 This is a schematic diagram of the detection groove and leveling assembly in Embodiment 1 of this application.

[0027] Figure 3 This is a schematic diagram of the leveling component, fine-tuning component, and mounting component in Embodiment 1 of this application.

[0028] Figure 4 This is a schematic diagram of the structure of the limiting component in Embodiment 1 of this application.

[0029] Figure 5 This is a schematic diagram of the structure of the limiting component in Embodiment 2 of this application.

[0030] Figure 6 This is an installation state diagram of the weldment to be tested in Embodiment 3 of this application.

[0031] Figure 7 This is a schematic diagram of the structure of the limiting component in Embodiment 3 of this application.

[0032] Explanation of reference numerals in the attached drawings: 1. Machine body; 11. Probe; 2. Detection slot; 3. Tooling plate; 31. Insertion hole; 4. Leveling assembly; 41. Fixing block; 42. First long rod bolt; 43. Adjusting screw block; 44. Locking screw block; 45. Lifting block; 5. Fine-tuning assembly; 51. Second long rod bolt; 52. Fine-tuning block; 53. Support base; 531. Support flange; 54. Fine-tuning screw block; 6. Mounting assembly; 61. First stabilizing rod; 6 2. First connector; 63. First pressure block; 631. Pressure application part; 7. Restriction component; 71. Second pressure block; 72. Second stabilizing rod; 73. Second connector; 74. Clamping seat; 741. Clamping block; 742. Supporting inclined surface; 75. Third stabilizing rod; 76. Third connector; 77. Restriction seat; 771. Fourth stabilizing rod; 772. Fourth connector; 78. Adjusting rod; 79. Rotating rod; 791. Locking bolt. Detailed Implementation

[0033] The following is in conjunction with the appendix Figures 1-7 This application will be described in further detail.

[0034] Embodiment 1 of this application discloses an ultrasonic welding inspection device. (Refer to...) Figure 1 and Figure 2 The ultrasonic welding component inspection equipment includes a body 1, a probe 11, and an inspection tank 2. The probe 11 is installed on the movable end of the body 1. The inspection tank 2 is installed on the body 1 and is filled with a coupling fluid; in this embodiment, the coupling fluid is water.

[0035] Reference Figure 2 and Figure 3 The detection groove 2 is equipped with a tooling plate 3 and a leveling assembly 4. The leveling assembly 4 includes a fixing block 41, a first long rod bolt 42, an adjusting screw block 43, a locking screw block 44, and a lifting block 45. A fixing block 41 is fixedly connected to each of the opposite side walls of the detection groove 2. Several first long rod bolts 42 pass through the fixing blocks 41; in this embodiment, two bolts are used as an example. The lifting block 45 passes through two first long rod bolts 42. The adjusting screw block 43 is rotatably connected to the lifting block 45 and threadedly engaged with the first long rod bolts 42. The locking screw block 44 is threadedly engaged with the first long rod bolts 42 and abuts against the fixing block 41.

[0036] Reference Figure 3Both ends of the lifting block 45 are equipped with fine-tuning components 5, which include a second long bolt 51, a fine-tuning block 52, a support base 53, and a fine-tuning rotary block 54. The second long bolt 51 is vertically inserted into the fixed block 41. The lifting block 45 has a lifting groove, which is a T-shaped groove. The fine-tuning block 52 is slidably fitted in the lifting groove, and the second long bolt 51 passes through the fine-tuning block 52. The fine-tuning rotary block 54 is rotatably connected to the fine-tuning block 52 and is threadedly engaged with the second long bolt 51. The support base 53 is bolted to the fine-tuning block 52, and a support flange 531 is threadedly fitted on the support base 53. The support flange 531 is used to support the tooling plate 3.

[0037] Reference Figure 2 and Figure 3 The support base 53 is equipped with a mounting assembly 6, which includes a first stabilizing rod 61, a first connector 62, and a first pressure block 63. The support base 53 has mounting holes, and the first stabilizing rod 61 is threaded into these holes. The first connector 62 is fixedly connected to the first stabilizing rod 61 and abuts against the support base 53. The first pressure block 63 has a pressure-applying part 631, and a tooling plate 3 is located between the pressure-applying part 631 and the support flange 531.

[0038] During leveling, the tooling plate 3 is placed on the support flange 531. Then, the adjusting knob 43 is rotated to lower the lifting block 45 until the tooling plate 3 is placed in the coupling fluid and the lifting blocks 45 on both sides are at the same height. Then, the fine-tuning knob 54 is rotated to move the fine-tuning block 52, which in turn moves the support seat 53 until the tooling plate 3 reaches a horizontal state. Then, the first connector 62 is rotated to move the first stabilizing rod 61 until the first connector 62 presses against the support seat 53. Then, the first pressure block 63 is fitted onto the first stabilizing rod 61 and pressed down so that the pressure part 631 presses the tooling plate 3. The friction between the first pressure block 63 and the first stabilizing rod 61 restricts the movement of the first pressure block 63, thus achieving the effect of adjusting the height of the tooling plate 3 and leveling the tooling plate 3.

[0039] Reference Figure 2 and Figure 4 The fixture plate 3 has several insertion holes 31 and several limiting components 7, including a second pressure block 71, a second stabilizing rod 72, and a second connector 73. The second stabilizing rod 72 is inserted into the insertion hole 31, and the second connector 73 is fixedly connected to the second stabilizing rod 72 and abuts against the fixture plate 3. One end of the second pressure block 71 slides on the second stabilizing rod 72, and the other end applies pressure to the workpiece to be tested.

[0040] When installing the weldment to be tested, the weldment is placed on the fixture plate 3, and the second stabilizing rod 72 is inserted into the insertion hole 31, so that the second connector 73 abuts against the fixture plate 3. Then, one end of the second pressure block 71 is sleeved on the second stabilizing rod 72, and the other end applies pressure to the weldment to be tested. Through the deformation of the second pressure block 71, friction is generated between it and the second stabilizing rod 72, thereby restricting the movement of the second pressure block 71 and achieving the effect of installing the weldment to be tested. In this embodiment, the limiting component 7 is suitable for weldments with regular and flat shapes.

[0041] The implementation principle of the ultrasonic welding inspection device in Embodiment 1 of this application is as follows: Before inspection, the fixture plate 3 is placed on the support flange 531, and the adjusting screw 43 is rotated to lower the lifting block 45 until the two lifting blocks 45 on both sides are level, ensuring that the fixture plate 3 is in the coupling fluid. Then, the fine-tuning screw 54 is rotated to move the support seat 53 until the four corners of the fixture plate 3 are level. Then, the first stabilizing rod 61 is threaded onto the support seat 53, and the first connector 62 abuts against the support seat 53. 3. The first pressure block 63 is fitted onto the first stabilizing rod 61, and the pressure applying part 631 applies pressure to the fixture plate 3 to install the fixture plate 3. The weldment to be tested is placed on the fixture plate 3, and the second stabilizing rod 72 is inserted into the insertion hole 31. The second connector 73 abuts against the fixture plate 3. Finally, the second pressure block 71 is fitted onto the second stabilizing rod 72, and the other end of the second pressure block 71 is pressed against the weldment to be tested to stabilize the weldment to be tested. Finally, the probe 11 is moved by the machine body 1 to detect the weldment to be tested.

[0042] First, the leveling component 4 is used to level both sides of the fixture plate 3. Then, the fine-tuning component 5 is used to level the height of each corner of the fixture plate 3, so that the workpiece to be tested is restricted to the horizontal fixture plate 3. This ensures that the detection surface of the workpiece to be tested is as horizontal as possible, and avoids the phenomenon of signal attenuation caused by the gradual increase in distance between the probe 11 and the workpiece to be tested when the probe 11 moves. This ensures the data accuracy of the testing equipment, facilitates the testing of the workpiece, and improves the testing efficiency of the ultrasonic welding workpiece testing equipment.

[0043] Example 2: The difference between this example and Example 1 is that the structure of the limiting component 7 is different.

[0044] Reference Figure 5 The limiting component 7 includes a retaining seat 74, a third stabilizing rod 75, and a third connector 76. Several retaining seats 74 are placed on the tooling plate 3; in this embodiment, four are used as an example. Each retaining seat 74 has a through-hole. One end of each retaining seat 74 has an integrally formed retaining block 741, on which a supporting inclined surface 742 is provided. The third stabilizing rod 75 passes through the through-hole and is threadedly engaged with the plug block. The third connector 76 presses against the retaining seat 74.

[0045] During installation, the third stabilizing rod 75 is threaded into the insertion hole 31, causing the third connector 76 to press against the retaining seat 74 to stabilize the retaining seat 74. Finally, the weldment to be tested is placed between the four supporting inclined surfaces 742. In this embodiment, the limiting component 7 is suitable for the installation of columnar weldments.

[0046] Example 3: The difference between this example and Example 1 is that the structure of the limiting component 7 is different.

[0047] Reference Figure 6 and Figure 7 The limiting component 7 includes a limiting seat 77, an adjusting rod 78, and a rotating rod 79. Several limiting seats 77 are placed on the tooling plate 3; in this embodiment, four are used as an example. Each limiting seat 77 has a mounting groove. A fourth stabilizing rod 771 passes through the mounting groove and is threadedly engaged with the plug-in block. A fourth connecting head 772 is fixedly connected to the fourth stabilizing rod 771, pressing against the limiting seat 77. One end of the rotating rod 79 is fitted with a locking bolt 791, which is hinged to the limiting seat 77. The locking bolt 791 is threadedly engaged with the limiting seat 77. The adjusting rod 78 passes through the rotating rod 79 and is threadedly engaged with it, abutting against the pressing seat 74.

[0048] The weldment to be tested is placed on the four rotating rods 79. By rotating the adjusting rod 78, the rotating rods 79 are rotated to adjust the local height of the weldment until it reaches a horizontal state, thus achieving the installation of the weldment. In this embodiment, the limiting component 7 is suitable for leveling irregularly shaped weldments with relatively complex structures.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An ultrasonic weldment inspection apparatus, characterized by: The utility model provides a kind of welding quality testing device, including body (1), probe (11) and detection groove (2), the probe (11) is installed in the mobile end of the body (1), the detection groove (2) is installed on the body (1), the detection groove (2) is filled with coupling liquid, tooling plate (3) and leveling assembly (4) are provided in the detection groove (2), the leveling assembly (4) includes fixed block (41), first long rod bolt (42), adjusting screw block (43), locking screw block (44) and lifting block (45), the fixed block (41) is connected in two on the opposite side of the detection groove (2), the first long rod bolt (42) is vertically set in the fixed block (41), the lifting block (45) is slidably connected on the first long rod bolt (42), the adjusting screw block (43) is rotatably connected on the lifting block (45), and is threadedly connected with the first long rod bolt (42), the locking screw block (44) is threadedly connected on the first long rod bolt (42), and abuts against the fixed block (41), the lifting block (45) is provided with fine adjustment assembly (5) for fine adjustment of the corner height of the tooling plate (3), and the tooling plate (3) is detachably connected to the fine adjustment assembly (5).

2. The ultrasonic weldment inspection apparatus of claim 1, wherein: The fine adjustment assembly (5) includes second long rod bolt (51), fine adjustment block (52), support seat (53) and fine adjustment screw block (54), the second long rod bolt (51) is vertically set in the fixed block (41), the lifting block (45) is provided with lifting groove, the fine adjustment block (52) is slidably connected in the lifting groove, the fine adjustment screw block (54) is rotatably connected to the fine adjustment block (52), and is threadedly connected with the second long rod bolt (51), the support seat (53) is detachably connected to the fine adjustment block (52), the tooling plate (3) is placed on the support seat (53), and the support seat (53) is provided with mounting assembly (6) for limiting the tooling plate (3).

3. The ultrasonic weldment inspection apparatus of claim 2, wherein: The mounting assembly (6) includes first stable rod (61), first connecting head (62) and first pressing block (63), the support seat (53) is provided with mounting hole, the first stable rod (61) is threadedly connected in the mounting hole, the first connecting head (62) is connected to the first stable rod (61), and abuts against the support seat (53), the first pressing block (63) is slidably connected to the first stable rod (61), and the first pressing block (63) is provided with pressing part (631), and the pressing part (631) is pressed to the tooling plate (3).

4. The ultrasonic weldment inspection apparatus of claim 3, wherein: The support seat (53) is threadedly connected with support flange (531), and the tooling plate (3) is located between the pressing part (631) and the support flange (531).

5. The ultrasonic weld joint inspection apparatus of claim 1, wherein: The tooling plate (3) is provided with a plurality of limiting assemblies (7) for limiting the welding piece to be tested on the tooling plate (3), and the tooling plate (3) is provided with a plurality of insertion holes (31).

6. The ultrasonic weldment inspection apparatus of claim 5, wherein: The limiting assembly (7) comprises a second pressing block (71), a second stable rod (72) and a second connecting head (73), the second stable rod (72) is inserted into the insertion hole (31), the second connecting head (73) is connected to the second stable rod (72) and abuts against the tool plate (3), one end of the second pressing block (71) is slidingly connected to the second stable rod (72) and the other end is pressed against the welding piece to be measured.

7. The ultrasonic weldment inspection apparatus of claim 5, wherein: The limiting assembly (7) comprises an abutting seat (74), a third stable rod (75) and a third connecting head (76), the abutting seat (74) is provided with several abutting blocks (741) on the tool plate (3), the abutting block (741) is provided with a supporting inclined surface (742), the abutting seat (74) is provided with a through groove, the third stable rod (75) passes through the through groove and is screwed into the insertion hole (31), the third connecting head (76) is connected to the third stable rod (75) and abuts against the abutting seat (74), when the welding piece to be measured is limited, the welding piece to be measured is placed between the supporting inclined surfaces (742).

8. The ultrasonic weldment inspection apparatus of claim 5, wherein: The limiting assembly (7) comprises a limiting seat (77), an adjusting rod (78) and a rotating rod (79), the limiting seat (77) is provided with several limiting seats (77) on the tool plate (3), the limiting seat (77) is provided with an installation groove, the fourth stable rod (771) is inserted into the installation groove, the fourth stable rod (771) is connected to the fourth connecting head (772), the fourth stable rod (771) is screwed into the insertion hole (31), the fourth connecting head (772) abuts against the limiting seat (77), one end of the rotating rod (79) is provided with a locking bolt (791), the locking bolt (791) is screwed into the limiting seat (77), the adjusting rod (78) is screwed into the rotating rod (79) and abuts against the limiting seat (77), when the welding piece to be measured is installed, the welding piece to be measured is placed on the rotating rods (79).

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