Water immersion type welding seam leak hunting device for vacuum electron beam welding polycrystalline silicon reduction electrode

Abstract

The utility model relates to a water immersion type welding seam leak hunting device for a vacuum electron beam welding polycrystalline silicon reduction electrode. A liquid storage tank is arranged on a rack. The placing frame is arranged in the liquid storage tank, and a supporting groove extending in the transverse direction is formed in the placing frame. The abutting block is installed on the containing frame and arranged on the transverse side of the supporting groove. The air tap assembly is arranged on the other transverse side of the supporting groove and is opposite to the abutting block, the air tap assembly comprises an air tap, a sealing gasket and a mounting block, the air tap and the sealing gasket are both mounted on the side, facing the abutting block, of the mounting block, and the air tap is exposed out of the sealing gasket. The movable driving part is mounted on the placement frame, is in driving connection with the mounting block, and drives the air tap assembly to transversely move so as to enable the air tap assembly to be close to or away from the abutting block. And the lifting driving part is mounted on the rack, is in driving connection with the placing frame and drives the placing frame to ascend or descend. And whether bubbles are generated or not is observed by inflating the cooling channel in water so as to judge the sealing performance of the weld joint.

Description

Technical Field

[0001] The utility model relates to the field of polysilicon reduction electrode weld detection, in particular to a water-immersion weld leak detection device for vacuum electron beam welding polysilicon reduction electrodes. Background Art

[0002] The polysilicon reduction electrode includes an electrode body and a cone head, which need to be welded into an integrated structure in a vacuum electron beam welding machine. A cooling channel is also provided in the polysilicon reduction electrode, which runs through the electrode body and the cone head. One end of the cooling channel is open and the other end is closed.

[0003] The basic principle of electron beam welding is that the cathode in the electron gun emits electrons due to direct or indirect heating. The electrons are accelerated by a high-voltage electrostatic field and then focused by an electromagnetic field to form an electron beam with extremely high energy density. This electron beam is used to bombard the workpiece, and the huge kinetic energy is converted into heat energy, which melts the workpiece at the welding point to form a molten pool, thereby realizing the welding of the workpiece.

[0004] However, after the welding process, it was found that some products had gaps in the weld between the electrode body and the cone head, resulting in defects, so it was necessary to inspect the weld. Utility Model Content

[0005] The utility model aims to provide a water-immersion weld leak detection device for vacuum electron beam welding of polysilicon reduction electrodes, which can judge the sealing of the weld by inflating water into a cooling channel to observe whether bubbles are generated.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions.

[0007] The utility model provides a water-immersion weld leak detection device for a polysilicon reduction electrode in vacuum electron beam welding, which comprises: a frame provided with a liquid storage tank; a placement frame provided in the liquid storage tank, the placement frame provided with a support groove extending in the transverse direction; a support block installed on the placement frame and arranged on one side of the support groove in the transverse direction; a gas nozzle assembly provided on the other side of the support groove in the transverse direction and arranged opposite to the support block, the gas nozzle assembly comprising a gas nozzle, a sealing pad and a mounting block, the gas nozzle and the sealing pad are both installed on the side of the mounting block facing the support block, and the gas nozzle is exposed to the sealing pad; a moving drive member installed on the placement frame, the moving drive member is drivingly connected to the mounting block, the moving drive member drives the gas nozzle assembly to move in the transverse direction so that the gas nozzle assembly is close to or away from the support block; a lifting drive member installed on the frame, the lifting drive member is drivingly connected to the placement frame, and the lifting drive member drives the placement frame to rise or fall.

[0008] In some embodiments of the present application, the placement rack includes a main body and a support frame; the support frame is liftably installed above the main body, and the support groove is provided on the support frame.

[0009] In some embodiments of the present application, the placement rack also includes multiple groups of adjustment components; the adjustment component includes a rod extending vertically and a head connected to the upper end of the rod; the rod is screwed to the support frame, and the lower end of the rod is supported on the main body, and the head is arranged above the support frame.

[0010] In some embodiments of the present application, the main body is provided with a movable groove extending in the transverse direction; the adjustment assembly also includes a support block; the support block is connected to the lower end of the rod and is laterally movable in the movable groove.

[0011] In some embodiments of the present application, the support frame includes a support bar and a connecting bar; the support bar extends in the transverse direction, and the support groove is provided on the support bar, and two support bars are provided in the longitudinal direction side by side and spaced apart; the connecting bar extends in the longitudinal direction and connects the two support bars, and two connecting bars are provided in the transverse direction side by side and spaced apart, and are respectively provided at both ends of the support bar; four adjustment components are provided, two of which are provided at both ends of one of the connecting bars, and the remaining two are provided at both ends of the other connecting bar; two of the supporting blocks, the air nozzle components and the movable driving components are each provided, and correspond to the two support grooves respectively.

[0012] In some embodiments of the present application, the supporting block is installed on the placement rack in a liftable manner.

[0013] In some embodiments of the present application, the supporting block includes a movable portion and a supporting portion connected to each other, and the width of the movable portion is greater than the width of the supporting portion; the supporting block includes a damping portion, and two damping portions are provided and are respectively connected to both sides of the width direction of the movable portion; the placement rack includes a vertical plate; the vertical plate is provided with a lifting groove extending vertically; the lifting groove includes a first slide groove and a second slide groove that are connected to each other, the groove width of the first slide groove is greater than the groove width of the second slide groove, and the first slide groove is located on the inner side of the second slide groove; the movable portion and the two damping portions are both provided in the first slide groove, and the damping portion elastically contacts the inner wall of the first slide groove, and the supporting portion extends out of the second slide groove.

[0014] In some embodiments of the present application, the placement rack also includes a clamping bar extending vertically; the cross-section of the clamping bar is L-shaped, the clamping bar is detachably mounted on the vertical plate, two clamping bars are provided and are symmetrically arranged, and the interval between the two clamping bars forms the lifting groove.

[0015] In some embodiments of the present application, a flexible pad is provided on the side of the supporting block facing the air nozzle assembly.

[0016] In some embodiments of the present application, two lifting drive members are provided and are symmetrically driven and connected to the two lateral ends of the placement rack.

[0017] It can be seen from the above technical solutions that the embodiments of the utility model have at least the following advantages and positive effects:

[0018] In the water-immersion weld leak detection device for vacuum electron beam welding of polysilicon reduction electrodes of the utility model embodiment, water or other liquids are injected into the liquid storage tank. The lifting drive drives the placement rack to rise above the liquid surface, and the mobile drive drives the air nozzle assembly away from the abutment block so that the electrode is not interfered when placed on the support groove. The electrode is placed on the support groove, and the opening of the cooling channel in the electrode is facing the air nozzle assembly, and the placement rack supports and positions the electrode. The mobile drive then drives the air nozzle assembly to approach the abutment block, so that the electrode is clamped between the abutment block and the air nozzle assembly, and the sealing gasket seals the opening of the cooling channel to prevent water or other liquids from entering the cooling channel, and the air nozzle is connected to the cooling channel. The lifting drive then drives the placement rack to descend below the liquid surface, and the electrode is immersed in water or other liquids. The air nozzle inflates the cooling channel to observe whether bubbles are generated at the weld of the electrode body and the cone head. If no bubbles are generated, it proves that the sealing at the weld is good and the product is qualified. If bubbles are generated, it proves that there is a gap at the weld, the sealing is poor, and the product is unqualified. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are only exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always represent the same or similar parts. Among them:

[0020] Figure 1 It is a schematic diagram of the structure of a polysilicon reduction electrode.

[0021] Figure 2 yes Figure 1 sectional view of .

[0022] Figure 3 It is a schematic diagram of the structure of the protective cover on the polysilicon reduction electrode cover.

[0023] Figure 4 It is a structural schematic diagram of a water-immersion weld leak detection device for vacuum electron beam welding of polysilicon reduction electrodes according to an embodiment of the utility model.

[0024] Figure 5 yes Figure 4 Schematic diagram of the structure without the polysilicon reduction electrode.

[0025] Figure 6 yes Figure 5Schematic diagram of the structure after removing the frame and lifting drive components.

[0026] Figure 7 yes Figure 6 Schematic diagram of the structure from another angle.

[0027] Figure 8 yes Figure 7 Schematic diagram of the structure of area A in the middle.

[0028] Fig. 9 yes Figure 7 Schematic diagram of the structure of the clamping block.

[0029] The accompanying drawings are marked as follows: D1, first direction; D2, second direction; D3, third direction; 1, frame; 11, liquid storage tank; 2, placement rack; 21, main body; 211, movable slot; 22, support frame; 221, support bar; 2211, support slot; 222, connecting bar; 23, adjustment assembly; 231, rod; 232, head; 233, support block; 24, vertical plate; 241, lifting slot; 25, clamping bar; 3, supporting block; 31, moving part; 32, supporting part; 33, damping part; 34, flexible pad; 4, air nozzle assembly; 41, air nozzle; 42, sealing pad; 43, mounting block; 5, movable drive member; 6, lifting drive member; 7, protective cover; 9, electrode; 91, electrode body; 92, cone head; 93, cooling channel. DETAILED DESCRIPTION

[0030] Although the present invention can be easily embodied as embodiments of different forms, only some of the specific embodiments are shown in the drawings and described in detail in this specification. It should be understood that this description should be regarded as an exemplary description of the principles of the present invention and is not intended to limit the present invention to that described herein.

[0031] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the utility model, rather than implying that each embodiment of the utility model must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0032] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of various elements of the utility model are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0033] See also Figures 1 to 3 The polysilicon reduction electrode 9 includes an electrode body 91 and a cone head 92. The electrode body 91 and the cone head 92 need to be welded into an integrated structure in a vacuum electron beam welding machine. Figure 1 The dotted line in the figure shows the position of the welding line between the electrode body 91 and the cone head 92. A cooling channel 93 is also provided in the polysilicon reduction electrode. The cooling channel 93 runs through the electrode body 91 and the cone head 92. One end of the cooling channel 93 is open and the other end is closed.

[0034] See also Figure 4 For ease of description, Figure 4 The first direction D1 shown is a transverse direction, the second direction D2 is a lifting direction, and the third direction D3 is a longitudinal direction. The transverse direction, the lifting direction, and the longitudinal direction are perpendicular to each other.

[0035] See also Figures 4 to 7 The utility model provides a water immersion weld leak detection device for vacuum electron beam welding of polysilicon reduction electrode 9, which includes a frame 1, a placement frame 2, a support block 3, a gas nozzle assembly 4, a moving drive member 5 and a lifting drive member 6.

[0036] The frame 1 is provided with a liquid storage tank 11. The placing rack 2 is arranged in the liquid storage tank 11, and the placing rack 2 is provided with a supporting groove 2211 extending in the transverse direction. The abutting block 3 is installed on the placing rack 2 and is arranged on one side of the supporting groove 2211 in the transverse direction. The air nozzle assembly 4 is arranged on the other side of the supporting groove 2211 in the transverse direction, and is arranged opposite to the abutting block 3. The air nozzle assembly 4 includes an air nozzle 41, a sealing pad 42 and a mounting block 43. The air nozzle 41 and the sealing pad 42 are both installed on the side of the mounting block 43 facing the abutting block 3, and the air nozzle 41 is exposed to the sealing pad 42. The moving driving member 5 is installed on the placing rack 2, and the moving driving member 5 is driven and connected to the mounting block 43. The moving driving member 5 drives the air nozzle assembly 4 to move in the transverse direction so that the air nozzle assembly 4 is close to or away from the abutting block 3. The lifting driving member 6 is installed on the frame 1, and the lifting driving member 6 is driven and connected to the placing rack 2. The lifting driving member 6 drives the placing rack 2 to rise or fall.

[0037] When in use, water or other liquids are injected into the liquid storage tank 11. The lifting drive 6 drives the placement rack 2 to rise above the liquid surface, and the mobile drive 5 drives the air nozzle assembly 4 away from the abutment block 3 so that the electrode 9 is not interfered with when placed on the support groove 2211. The electrode 9 is placed on the support groove 2211, and the opening of the cooling channel 93 in the electrode 9 is facing the air nozzle assembly 4, and the placement rack 2 supports and positions the electrode 9. The mobile drive 5 then drives the air nozzle assembly 4 to approach the abutment block 3, so that the electrode 9 is clamped between the abutment block 3 and the air nozzle assembly 4, and the sealing gasket 42 seals the opening of the cooling channel 93 to prevent water or other liquids from entering the cooling channel 93, and the air nozzle 41 is connected to the cooling channel 93. The lifting and lowering drive the placement rack 2 to descend below the liquid surface, and the electrode 9 is immersed in water or other liquids. The air nozzle 41 inflates air into the cooling channel 93 to observe whether bubbles are generated at the weld between the electrode 9 body and the cone head 92. If no bubbles are generated, it proves that the sealing of the weld is good and the product is qualified. If bubbles are generated, it proves that there is a gap at the weld, the sealing is poor, and the product is unqualified.

[0038] It can be understood that before placing the electrode 9, the lifting drive 6 drives the placement rack 2 to rise above the liquid surface, which can prevent the liquid from entering the cooling channel 93 before inflation.

[0039] It is worth mentioning that, since the air nozzle assembly 4 can move laterally, the device can be suitable for electrodes 9 of different lengths, and the moving distance of the air nozzle assembly 4 can be adjusted to adapt to the clamping of electrodes 9 of different lengths.

[0040] In this embodiment, the air nozzle 41 protrudes from the surface of the sealing gasket 42. In other embodiments, the air nozzle 41 may also be flush with the surface of the sealing gasket 42, or located on the inner side of the surface of the sealing gasket 42, and the sealing gasket 42 is provided with an outlet for the air nozzle 41 to discharge air. The sealing gasket 42 may be made of rubber material. The diameter of the sealing gasket 42 is larger than the aperture of the cooling channel 93 to ensure the sealing effect. The air nozzle 41 may be supplied with air by an air pump.

[0041] There are two lifting drive members 6, which are symmetrically driven and connected to the two ends of the placement rack 2. The two symmetrically arranged lifting drive members 6 not only improve the driving force, but also make the driving force acting on the placement rack 2 more balanced, so that the lifting of the placement rack 2 is more stable. In this embodiment, the moving drive member 5 and the lifting drive member 6 are both cylinders.

[0042] See also Figure 6 and Figure 7The placement rack 2 includes a main body 21 and a support rack 22. The support rack 22 is installed above the main body 21 in a liftable manner, and a support groove 2211 is provided on the support rack 22. By lifting and adjusting the support rack 22, the device can be applied to electrodes 9 with different diameters, and by adjusting the height of the air nozzle assembly 4, the air nozzle 41 can be aligned with the cooling channel 93. In this embodiment, the lifting drive 6 is driven and connected to the placement rack 2.

[0043] See also Figure 8 The placement rack 2 also includes multiple groups of adjustment components 23. The adjustment component 23 includes a rod 231 extending vertically and a head 232 connected to the upper end of the rod 231. The rod 231 is screwed to the support frame 22, and the lower end of the rod 231 is supported on the main body 21, and the head 232 is arranged above the support frame 22. The head 232 is convenient for clamping and fixing with tools such as wrenches. By rotating the head 232 to drive the rod 231 to rotate, the height difference between the support frame 22 and the main body 21 is adjusted, thereby realizing the lifting and lowering of the support frame 22. The rod 231 and the head 232 can adopt hexagonal bolts.

[0044] The main body 21 is provided with a movable groove 211 extending in the transverse direction. The adjustment assembly 23 also includes a support block 233. The support block 233 is connected to the lower end of the rod 231 and is disposed in the movable groove 211 so as to be laterally movable. The support area is increased by the support block 233, so that the support frame 22 can be placed more stably on the main body 21. The support block 233 is disposed in the movable groove 211. On the one hand, the movable groove 211 can limit the longitudinal movement of the support frame 22, so as to prevent the two ends of the electrode 9 placed on the support groove 2211 from being unable to align with the support block 3 and the gas nozzle 41. On the other hand, when placing electrodes 9 of different lengths, the length of the support groove 2211 extending below the gas nozzle assembly 4 can be adjusted by moving the support frame 22, and the length located outside the gas nozzle assembly 4 is used to support and position electrodes 9 of different lengths, so that the device has universality.

[0045] See also Figure 7 The support frame 22 includes a support bar 221 and a connecting bar 222. The support bar 221 extends in the horizontal direction, and a support groove 2211 is provided on the support bar 221. Two support bars 221 are provided in parallel and spaced in the longitudinal direction. The connecting bar 222 extends in the longitudinal direction and connects the two support bars 221. Two connecting bars 222 are provided in parallel and spaced in the horizontal direction, and are respectively provided at both ends of the support bar 221. That is, the support frame 22 adopts a frame-type structure with two horizontal and two vertical parts, which reduces the weight of the support frame 22, thereby reducing the load of the lifting drive member 6, and facilitating the lifting drive member 6 to drive the placement frame 2 to lift. In this embodiment, the main body 21 also adopts a frame-type structure with two horizontal and two vertical parts.

[0046] There are four adjustment components 23, two of which are arranged at the two ends of one of the connecting strips 222, and the remaining two are arranged at the two ends of the other connecting strip 222. The four adjustment components 23 form a stable support at the four corners of the support frame 22. There are two abutment blocks 3, two air nozzle components 4 and two movable drive members 5, and they correspond to the two support grooves 2211 respectively. The device can perform weld leak detection of two polysilicon reduction electrodes 9 at a time. In other embodiments, there can be three or more support grooves 2211, abutment blocks 3, air nozzle components 4 and movable drive members 5.

[0047] See also Figure 7 and Fig. 9 The abutment block 3 can be installed on the placement rack 2 in a liftable manner. The abutment block 3 can be adjusted by lifting to ensure that the abutment block 3 is aligned with the sealing gasket 42, so that when the sealing gasket 42 abuts one end of the electrode 9, the abutment block 3 can abut the other end of the electrode 9.

[0048] The abutting block 3 includes a movable portion 31 and an abutting portion 32 connected to each other, and the width of the movable portion 31 is greater than the width of the abutting portion 32. The abutting block 3 includes a damping portion 33, and two damping portions 33 are provided and are respectively connected to both sides of the width direction of the movable portion 31. The placement rack 2 includes a vertical plate 24. The vertical plate 24 is provided with a lifting groove 241 extending vertically. The lifting groove 241 includes a first sliding groove and a second sliding groove connected to each other, the groove width of the first sliding groove is greater than the groove width of the second sliding groove, and the first sliding groove is located on the inner side of the second sliding groove. The movable portion 31 and the two damping portions 33 are both arranged in the first sliding groove, and the damping portion 33 elastically contacts the inner wall of the first sliding groove, and the abutting portion 32 extends out of the second sliding groove. The abutting portion 32 is used to abut the other end of the electrode 9, and the damping portion 33 can be made of rubber material. The friction between the damping portion 33 and the inner wall of the first slide groove can make the abutting block 3 hover on the vertical plate 24, and the damping portion 33 is elastic. Overcoming the friction between the damping portion 33 and the inner wall of the first slide groove can realize the lifting and lowering of the abutting block 3 in the lifting groove 241. In this embodiment, the placement rack 2 is installed on the main body 21.

[0049] The placement rack 2 also includes a clamping strip 25 extending vertically. The cross section of the clamping strip 25 is L-shaped, and the clamping strip 25 is detachably mounted on the vertical plate 24. Two clamping strips 25 are provided and are symmetrically arranged, and the interval between the two clamping strips 25 forms a lifting groove 241. During installation, one clamping strip 25 can be installed first, and then one side of the moving part 31 of the supporting block 3 and a damping part 33 are extended into the groove in the clamping strip 25 for positioning, and then another clamping strip 25 is installed to clamp the supporting block 3 between the two clamping strips 25, which facilitates the installation of the supporting block 3.

[0050] A flexible pad 34 is provided on the side of the abutting block 3 facing the air nozzle assembly 4. The flexible pad 34 and the sealing pad 42 respectively abut the two ends of the electrode 9, which can avoid scratching the electrode 9 and can buffer the driving force of the moving driving member 5. The flexible pad 34 can be made of rubber material.

[0051] See also Figure 3 and Figure 4 The water-immersion weld leak detection device for vacuum electron beam welding of polysilicon reduction electrode 9 also includes a protective cover 7, which is used to protect the cone head 92 of the motor to prevent the silver-plated layer on the surface of the cone head 92 from being scratched during transportation. When clamping the electrode 9, the protective cover 7 abuts against the clamping strip 25, and the abutting portion 32 extends into the protective cover 7 and abuts against the end of the electrode 9.

[0052] Although the utility model has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the utility model can be implemented in a variety of forms without departing from the spirit or essence of the utility model, it should be understood that the above-mentioned embodiments are not limited to any of the aforementioned details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. A water-immersion weld leak detection device for vacuum electron beam welding of polysilicon reduction electrodes, characterized in that: include: A frame having a liquid storage tank; A placement rack is arranged in the liquid storage tank, and the placement rack is provided with a support groove extending in the transverse direction; A supporting block is installed on the placement rack and is arranged on one side of the support groove; An air nozzle assembly is arranged on the other side of the support groove in the horizontal direction and is arranged opposite to the abutting block. The air nozzle assembly includes an air nozzle, a sealing gasket and a mounting block. The air nozzle and the sealing gasket are both mounted on the side of the mounting block facing the abutting block, and the air nozzle is exposed on the sealing gasket; A mobile driving member is installed on the placement frame, the mobile driving member is drivingly connected to the mounting block, and the mobile driving member drives the air nozzle assembly to move laterally so that the air nozzle assembly is close to or away from the abutting block; A lifting drive component is installed on the frame, and the lifting drive component is drivingly connected to the placement rack, and the lifting drive component drives the placement rack to rise or fall.

2. The water immersion weld leak detection device for vacuum electron beam welding of polysilicon reduction electrodes according to claim 1, characterized in that: The placement rack comprises a main body and a support frame; The support frame is liftably installed above the main body, and the support groove is provided on the support frame.

3. The water immersion weld leak detection device for vacuum electron beam welding of polysilicon reduction electrodes according to claim 2, characterized in that: The placement rack also includes multiple groups of adjustment components; The adjustment assembly includes a rod portion extending vertically and a head portion connected to the upper end of the rod portion; The rod part is screwed to the support frame, and the lower end of the rod part is supported on the main body, and the head part is arranged above the support frame.

4. The water immersion weld leak detection device for vacuum electron beam welding of polysilicon reduction electrodes according to claim 3, characterized in that: The main body is provided with a movable groove extending in the transverse direction; The adjustment assembly also includes a support block; The support block is connected to the lower end of the rod portion and is disposed in the movable groove in a transversely movable manner.

5. The water-immersion weld leak detection device for vacuum electron beam welding of polysilicon reduction electrodes according to claim 4, characterized in that: The support frame includes support bars and connecting bars; The support bar extends in the transverse direction, and the support bar is provided with the support groove, and two support bars are provided in parallel and spaced apart in the longitudinal direction; The connecting strip extends in the longitudinal direction and connects the two supporting strips. Two connecting strips are arranged side by side and spaced apart in the transverse direction and are respectively arranged at two ends of the supporting strips. There are four adjusting components, two of which are arranged at two ends of one of the connecting strips, and the remaining two are arranged at two ends of another connecting strip; The supporting block, the air nozzle assembly and the moving driving member are each provided with two and correspond to the two supporting grooves respectively.

6. The water-immersion weld leak detection device for vacuum electron beam welding of polysilicon reduction electrodes according to claim 1, characterized in that: The supporting block is installed on the placing frame in a liftable manner.

7. The water-immersion weld leak detection device for vacuum electron beam welding of polysilicon reduction electrodes according to claim 6, characterized in that: The abutting block comprises a moving portion and an abutting portion connected to each other, and the width of the moving portion is greater than the width of the abutting portion; The abutting block includes a damping part, and two damping parts are provided and respectively connected to two sides of the moving part in the width direction; The placement rack includes a vertical plate; The vertical plate is provided with a lifting slot extending vertically; The lifting slot includes a first sliding slot and a second sliding slot that are connected to each other, the slot width of the first sliding slot is greater than the slot width of the second sliding slot, and the first sliding slot is located on the inner side of the second sliding slot; The moving part and the two damping parts are both arranged in the first sliding groove, and the damping part elastically contacts the inner wall of the first sliding groove, and the supporting part extends out of the second sliding groove.

8. The water-immersion weld leak detection device for vacuum electron beam welding of polysilicon reduction electrodes according to claim 7, characterized in that: The placement rack also includes a clamping strip extending vertically; The cross section of the clamping strip is L-shaped. The clamping strip is detachably mounted on the vertical plate. Two clamping strips are provided and are symmetrically arranged. The interval between the two clamping strips forms the lifting slot.

9. The water-immersion weld leak detection device for vacuum electron beam welding of polysilicon reduction electrodes according to claim 1, characterized in that: A flexible pad is provided on one side of the abutting block facing the air nozzle assembly.

10. The water immersion weld leak detection device for vacuum electron beam welding of polysilicon reduction electrodes according to claim 1, characterized in that: The lifting drive members are provided with two and are symmetrically driven and connected to the two ends of the placement rack in the horizontal direction.

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