Lower clamp assembly of tube core leak detection machine

Abstract

The utility model discloses a lower clamp assembly of a pipe core leak detection machine, which is characterized in that a sealing mechanism capable of deforming transversely and a lifting mechanism capable of lifting vertically are arranged between a lower clamp and an exhaust pipe, the sealing mechanism is sleeved between the outer side of a pipe core and the inner side of the exhaust pipe, and the sealing mechanism movably abuts against the side wall of the pipe core and the inner wall of the exhaust pipe respectively. The lifting mechanism is telescopically connected with the lower clamp and drives the lower clamp to extrude the sealing mechanism. According to the utility model, through the arrangement of the sealing mechanism, when leakage detection needs to be carried out, the tube core is inserted into the lower clamp, the lifting mechanism moves downwards to drive the lower clamp to move downwards, so that the lower clamp extrudes the sealing mechanism, the sealing mechanism generates transverse deformation in an extrusion state, and the inner side of the sealing mechanism is attached to the side wall of the tube core; the outer side of the sealing mechanism is attached to the inner wall of the exhaust pipe to seal the pipe core and the exhaust pipe. As the contact surface between the sealing mechanism and the tube core is small and the transition is smooth, the fitting degree and the sealing performance can be improved.

Description

Technical Field

[0001] This utility model relates to the field of magnetron equipment technology, and in particular to a lower clamp assembly for a core leak detector. Background Technology

[0002] Microwave ovens undergo numerous tests during manufacturing and before leaving the factory, particularly leak testing of the core assembly. The core, comprising the cathode, anode, and exhaust pipe assemblies, is assembled by welding. Afterward, the core is vacuum-sealed, necessitating inspection for cracks, leaks, and ensuring the tightness of the welds between components. Since manual inspection is inefficient and prone to errors, a core leak detector is used for leak detection.

[0003] Patent No. ZL 202022643647.X discloses a leak detection device for a tube core. This device performs leak detection on the tube core and includes a sealing ring on the upper surface of a lower clamp. The sealing ring is made of an upwardly convex elastic material and is positioned at the connection between the upper surface of the lower clamp and the inner wall of the cylinder. When the exhaust pipe assembly is inserted into the lower clamp, the sealing ring is compressed, forcing it to expand laterally and cooperate with the exhaust pipe assembly, ensuring a tight seal between the lower clamp and the exhaust pipe assembly. However, the aforementioned patent's solution places the sealing ring at the top of the lower clamp, corresponding to the top of the exhaust pipe assembly. This results in a large contact area between the sealing ring and the exhaust pipe assembly. When the sealing ring expands laterally under pressure, gaps can easily exist between it and the exhaust pipe assembly, affecting the sealing performance. Furthermore, because the sealing ring is constantly exposed, it is easily damaged when the exhaust pipe assembly is inserted into the lower clamp. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a lower clamp assembly for a core leak detector.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A lower clamp assembly for a tube leak detector includes a lower clamp for holding a tube and an air extraction tube disposed at the bottom of the lower clamp, wherein the tube is inserted into the lower clamp and extends into the air extraction tube, characterized in that:

[0007] The lower clamp and the suction pipe are provided with a sealing mechanism that can deform laterally and a lifting mechanism that can be raised and lowered vertically. The sealing mechanism is sleeved between the outer side of the tube core and the inner side of the suction pipe, and is in movable contact with the side wall of the tube core and the inner wall of the suction pipe respectively. The lifting mechanism is telescopically connected to the lower clamp and drives the lower clamp to squeeze the sealing mechanism.

[0008] Preferably, the lower clamp is an upward-opening cylindrical structure with a fixed hole in the center that communicates with the air extraction pipe. The inner wall of the lower clamp is inclined downward toward the fixed hole, and the tube core is inserted into the fixed hole.

[0009] Preferably, the core includes an exhaust pipe located at the bottom, the top of the exhaust pipe overlapping the inner wall of the lower clamp, the bottom of the exhaust pipe passing through a fixing hole and communicating with the suction pipe, and a sealing mechanism sleeved on the outside of the exhaust pipe.

[0010] Preferably, the top of the suction pipe is provided with a downward-opening stepped groove, the sealing mechanism is embedded in the stepped groove, the top of the sealing mechanism abuts against the bottom of the lower clamp, and the bottom of the sealing mechanism abuts against the bottom of the stepped groove.

[0011] Preferably, the sealing mechanism includes a limiting ring sleeved on the outside of the tube core and a rubber ring connected to the limiting ring. The top of the limiting ring abuts against the lower clamp, and the bottom of the rubber ring abuts against the suction pipe.

[0012] Preferably, the limiting ring and the rubber ring are multiple sets stacked one on top of the other, with adjacent limiting rings and rubber rings abutting against each other, and a buffer pad is provided between the limiting ring and the lower clamp.

[0013] Preferably, the lifting mechanism includes a lifting plate connected to the lower clamp, and cylinders symmetrically arranged on both sides of the lifting plate, the cylinders being telescopically connected to the lifting plate.

[0014] Preferably, a horizontally arranged synchronous plate is provided above the lifting plate. The synchronous plate has a limiting hole that is axially aligned with the lower clamp. The limiting hole is sleeved on the outside of the lower clamp, and a limiting groove is provided between the synchronous plate and the lower clamp.

[0015] Preferably, the lower clamps are arranged in multiple groups side by side, and the cylinders corresponding to each group of lower clamps are arranged in series, with a synchronizing plate covering the lifting plate corresponding to each group of lower clamps.

[0016] This utility model has the following beneficial effects:

[0017] This invention utilizes a sealing mechanism. When leak detection is required, the core tube is inserted into the lower clamp. The lifting mechanism moves downward, causing the lower clamp to move downward as well. This causes the lower clamp to compress the sealing mechanism, resulting in lateral deformation. The inner side of the sealing mechanism adheres to the side wall of the core tube, while the outer side adheres to the inner wall of the extraction pipe, thus sealing the core tube and the extraction pipe. Because the contact area between the sealing mechanism and the core tube is small and the transition is smooth, it improves the fit and sealing performance. Furthermore, the sealing mechanism is concealed during core tube insertion, minimizing the risk of damage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the core leak detector of this utility model.

[0019] Figure 2 This is a schematic diagram of the assembly of the lower clamp and the upper clamp of this utility model.

[0020] Figure 3 This is an assembly diagram of the lower clamp assembly described in this utility model.

[0021] Figure 4 This is a schematic diagram of the structure of the lower clamp assembly described in this utility model.

[0022] Figure 5 This is a schematic diagram of the sealing mechanism described in this utility model.

[0023] Figure 6 This is a schematic diagram of the structure of the core described in this utility model.

[0024] Figure descriptions: 1. Core tube; 2. Lower clamp; 3. Suction pipe; 4. Sealing mechanism; 5. Fixing hole; 6. Cathode assembly; 7. Anode assembly; 8. Exhaust pipe; 9. Step groove; 10. Limiting ring; 11. Rubber ring; 12. Buffer pad; 13. Lifting plate; 14. Cylinder; 15. Synchronization plate; 16. Limiting hole; 17. Limiting groove; 18. Upper clamp. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Reference Figures 1 to 6 One embodiment provided by this utility model:

[0027] A lower clamp assembly for a core leak detector includes a lower clamp 2 for placing a core 1 and an air extraction pipe 3 located at the bottom of the lower clamp 2. The core 1 is inserted into the lower clamp 2 and extends into the air extraction pipe 3. A sealing mechanism 4 that can deform laterally is provided between the lower clamp 2 and the air extraction pipe 3, and a lifting mechanism that can be raised and lowered vertically is provided. The sealing mechanism 4 is sleeved between the outer side of the core 1 and the inner side of the air extraction pipe 3, and movably abuts against the side wall of the core 1 and the inner wall of the air extraction pipe 3, respectively. The lifting mechanism is telescopically connected to the lower clamp 2 and drives the lower clamp 2 to squeeze the sealing mechanism 4.

[0028] The lower clamp 2 is a cylindrical structure, matched with the core tube 1. It has an internal cavity for holding the core tube 1, and the bottom of the cavity has a through hole for inserting the core tube 1, corresponding to the position of the vacuum tube 3. The vacuum tube 3 is located at the bottom of the lower clamp 2, communicating with the bottom of the cavity, and is fitted onto the outside of the bottom of the core tube 1. The core tube 1 is inserted into the lower clamp 2, with its bottom passing through the bottom of the cavity and extending into the vacuum tube 3. The interior of the core tube 1 and the interior of the vacuum tube 3 are interconnected. The vacuum tube 3 is connected to a vacuum pump, which can evacuate the interior of the core tube 1.

[0029] The sealing mechanism 4 is located between the lower clamp 2 and the suction pipe 3. It is made of elastic materials such as rubber or silicone, and can expand under compression, thus achieving lateral deformation. The sealing mechanism 4 is a ring-shaped structure, fitted between the outer side of the core 1 and the inner side of the suction pipe 3, and in movable contact with both the core 1 and the suction pipe 3. The inner diameter of the suction pipe 3 can be larger than the outer diameter of the sealing mechanism 4, and the inner diameter of the sealing mechanism 4 can be larger than the outer diameter of the bottom of the core 1. The lifting mechanism is vertically installed and telescopically connected to the lower clamp 2. It can be driven by a cylinder 14. Under the action of the lifting mechanism, the lower clamp 2 moves downward, compressing the sealing mechanism 4, causing it to deform laterally, thus converting the vertical movement of the lower clamp 2 into the lateral movement of the sealing mechanism 4. In the laterally deformed state, the inner wall of the suction pipe 3 fits against the side wall of the sealing mechanism 4, and the inner wall of the sealing mechanism 4 fits against the side wall of the core 1, thus sealing the gap between the suction pipe 3 and the core 1, achieving a sealing effect.

[0030] This invention, by setting a sealing mechanism 4, allows for leak detection. When the core tube 1 is inserted into the lower clamp 2, the lifting mechanism moves downwards, causing the lower clamp 2 to move downwards as well. This compresses the sealing mechanism 4, causing it to deform laterally. The inner side of the sealing mechanism 4 fits against the side wall of the core tube 1, and the outer side fits against the inner wall of the extraction pipe 3, sealing both the core tube 1 and the extraction pipe 3. Because the contact area between the sealing mechanism 4 and the core tube 1 is small and the transition is smooth, it improves the fit and sealing performance. Furthermore, the concealed installation of the sealing mechanism 4 minimizes the risk of damage to the core tube 1 during insertion.

[0031] In this embodiment, preferably, the lower clamp 2 is a cylindrical structure with an upward opening, and a fixing hole 5 in the center is provided to communicate with the air extraction pipe 3. The inner wall of the lower clamp 2 is inclined downward toward the fixing hole 5, and the tube core 1 is inserted into the fixing hole 5.

[0032] The lower clamp 2 is an upward-opening cylindrical structure. The fixing hole 5 is located at the center of the lower clamp 2, is vertically through, and is connected to the suction pipe 3. The inner wall of the lower clamp 2 slopes downward toward the fixing hole 5 to guide the insertion of the tube core 1. The bottom of the tube core 1 is inserted into the fixing hole 5, and the outer side of the tube core 1 overlaps with the inner wall of the lower clamp 2. A bearing surface can be provided between the inner wall of the lower clamp 2 and the fixing hole 5 to support the tube core 1 and improve installation stability.

[0033] In this embodiment, preferably, the core 1 includes an exhaust pipe 8 located at the bottom, the top of the exhaust pipe 8 overlaps the inner wall of the lower clamp 2, the bottom of the exhaust pipe 8 passes through the fixing hole 5 and communicates with the suction pipe 3, and the sealing mechanism 4 is sleeved on the outside of the exhaust pipe 8.

[0034] The core 1 includes a cathode assembly 6, an anode assembly 7, and an exhaust pipe 8 connected sequentially from top to bottom, and the three are internally connected. The exhaust pipe 8 is located at the bottom of the core 1 and has an umbrella-shaped structure. The top of the exhaust pipe 8 overlaps with the inner wall of the lower clamp 2, and the bottom of the exhaust pipe 8 passes through the fixing hole 5 and is inserted into the suction pipe 3. The sealing mechanism 4 is sleeved on the outside of the exhaust pipe 8, and the exhaust pipe 8 is internally connected to the suction pipe 3.

[0035] In this embodiment, preferably, the top of the suction pipe 3 is provided with a downward-opening stepped groove 9, the sealing mechanism 4 is embedded in the stepped groove 9, the top of the sealing mechanism 4 abuts against the bottom of the lower clamp 2, and the bottom of the sealing mechanism 4 abuts against the bottom of the stepped groove 9.

[0036] The stepped groove 9 extends downwards from the top of the extraction pipe 3, forming a circular groove structure and coaxially arranged with the extraction pipe 3. The sealing mechanism 4 is embedded within the stepped groove 9 and axially aligned with it. The inner diameter of the stepped groove 9 is larger than the outer diameter of the sealing mechanism 4. The top of the sealing mechanism 4 abuts against the bottom of the lower clamp 2, and the bottom of the sealing mechanism 4 abuts against the bottom of the stepped groove 9. When the lower clamp 2 moves downwards, it compresses the sealing mechanism 4 within the stepped groove 9, clamping it between the bottom of the lower clamp 2 and the bottom of the stepped groove 9. The sealing mechanism 4 deforms laterally, fitting against the inner wall of the stepped groove 9 and the side wall of the extraction pipe 3, achieving a sealing effect.

[0037] In this embodiment, preferably, the sealing mechanism 4 includes a limiting ring 10 sleeved on the outside of the core 1, and a rubber ring 11 connected to the limiting ring 10. The top of the limiting ring 10 abuts against the lower clamp 2, and the bottom of the rubber ring 11 abuts against the suction pipe 3.

[0038] A limiting ring 10 and a rubber ring 11 are fitted onto the outside of the tube core 1, arranged in an upper and lower stacked configuration. The bottom of the limiting ring 10 is connected to the top of the rubber ring 11, and the two are coaxially arranged. The top of the limiting ring 10 abuts against the lower clamp 2, and the bottom of the rubber ring 11 abuts against the suction pipe 3. When the lower clamp 2 moves downward, the lower clamp 2 squeezes the limiting ring 10, and the limiting ring 10 drives the rubber ring 11 to squeeze the suction pipe 3, causing the rubber ring 11 to deform laterally. By using the limiting ring 10 as an intermediate component, the contact area between the lower clamp 2 and the rubber ring 11 can be reduced, thereby increasing the pressure and making it easier to control the deformation direction of the rubber ring 11.

[0039] In this embodiment, preferably, the limiting ring 10 and the rubber ring 11 are multiple sets stacked one on top of the other, and adjacent limiting rings 10 and rubber rings 11 abut against each other. A buffer pad 12 is provided between the limiting ring 10 and the lower clamp 2.

[0040] The sealing mechanism 4 includes multiple sets of limiting rings 10 and rubber rings 11. Each set of limiting rings 10 and rubber rings 11 is stacked vertically, with adjacent limiting rings 10 and rubber rings 11 abutting against each other. By increasing the number of sets, the length of the sealing mechanism 4 and the number of rubber rings 11 can be extended, providing a multi-layer sealing effect for the tube core 1. A buffer gasket 12 is provided between the limiting rings 10 and the lower clamp 2 to alleviate the rigid contact between the two, thereby extending service life and mitigating vibration.

[0041] In this embodiment, preferably, the lifting mechanism includes a lifting plate 13 connected to the lower clamp 2, and cylinders 14 symmetrically arranged on both sides of the lifting plate 13, with the cylinders 14 being telescopically connected to the lifting plate 13.

[0042] The lifting plate 13 is horizontally positioned and symmetrically distributed on both sides of the lower clamp 2, and is connected to the lower clamp 2. The cylinder 14 is vertically installed and symmetrically positioned on both sides of the lifting plate 13. The cylinder 14 is telescopically connected to the lifting plate 13 to improve the lifting balance. Under the action of the cylinder 14, the lifting plate 13 moves downward, driving the lower clamp 2 to move downward, thereby squeezing the sealing mechanism 4.

[0043] In this embodiment, preferably, a horizontally arranged synchronous plate 15 is provided above the lifting plate 13. The synchronous plate 15 is provided with a limiting hole 16 that is axially aligned with the lower clamp 2. The limiting hole 16 is sleeved on the outside of the lower clamp 2, and a limiting groove 17 is provided between the limiting hole 16 and the lower clamp 2.

[0044] The synchronization plate 15 is horizontally positioned, covering the lifting plate 13. A limiting hole 16 extends downwards from the surface of the synchronization plate 15, forming a vertical through-hole. The limiting hole 16 is fitted onto the outside of the lower clamp 2, axially aligned with it. The inner diameter of the limiting hole 16 is larger than the outer diameter of the lower clamp 2, forming a limiting groove 17 between them. During the leak detection of the core 1, the core leak detector includes an upper clamp 18 that matches the lower clamp 2. The upper clamp 18 is a downward-opening cylindrical structure. When the upper clamp 18 is closed with the lower clamp 2, the opening of the upper clamp 18 inserts into the limiting groove 17, improving positioning accuracy.

[0045] In this embodiment, preferably, the lower clamps 2 are arranged in multiple groups side by side, and the cylinders 14 corresponding to each group of lower clamps 2 are arranged in series, with the synchronization plate 15 covering the lifting plate 13 corresponding to each group of lower clamps 2.

[0046] To improve the leak detection efficiency of the core 1, multiple sets of lower clamps 2 are arranged side by side, each set of lower clamps 2 has a corresponding lifting plate 13 and cylinder 14. The cylinders 14 corresponding to each set of lower clamps 2 are arranged in series to ensure the synchronicity of the extension and retraction of multiple cylinders 14. A synchronization plate 15 covers the lifting plate 13 corresponding to each set of lower clamps 2 to ensure the synchronicity of the mutual closing of multiple sets of upper clamps 18 and lower clamps 2.

[0047] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lower clamp assembly for a tube leak detector, comprising a lower clamp for holding a tube core, and an air extraction pipe disposed at the bottom of the lower clamp, wherein the tube core is inserted into the lower clamp and extends into the air extraction pipe, characterized in that: The lower clamp and the suction pipe are provided with a sealing mechanism that can deform laterally and a lifting mechanism that can be raised and lowered vertically. The sealing mechanism is sleeved between the outer side of the tube core and the inner side of the suction pipe, and is in movable contact with the side wall of the tube core and the inner wall of the suction pipe respectively. The lifting mechanism is telescopically connected to the lower clamp and drives the lower clamp to squeeze the sealing mechanism.

2. The lower clamp assembly of a core leak detector according to claim 1, characterized in that: The lower clamp is a cylindrical structure with an upward opening, and a fixing hole in the center that communicates with the air extraction pipe. The inner wall of the lower clamp is inclined downward toward the fixing hole, and the tube core is inserted into the fixing hole.

3. The lower clamp assembly of a core leak detector according to claim 2, characterized in that: The core includes an exhaust pipe located at the bottom, with the top of the exhaust pipe overlapping the inner wall of the lower clamp, and the bottom of the exhaust pipe passing through a fixing hole and communicating with the suction pipe. A sealing mechanism is sleeved on the outside of the exhaust pipe.

4. The lower clamp assembly of a core leak detector according to claim 3, characterized in that: The top of the extraction pipe is provided with a downward-opening stepped groove, and the sealing mechanism is embedded in the stepped groove. The top of the sealing mechanism abuts against the bottom of the lower clamp, and the bottom of the sealing mechanism abuts against the bottom of the stepped groove.

5. The lower clamp assembly of a core leak detector according to claim 1, characterized in that: The sealing mechanism includes a limiting ring sleeved on the outside of the tube core and a rubber ring connected to the limiting ring. The top of the limiting ring abuts against the lower clamp, and the bottom of the rubber ring abuts against the suction pipe.

6. The lower clamp assembly of a core leak detector according to claim 5, characterized in that: The limiting ring and the rubber ring are arranged in multiple sets, with adjacent limiting rings and rubber rings abutting against each other, and a buffer pad is provided between the limiting ring and the lower clamp.

7. The lower clamp assembly of a core leak detector according to claim 1, characterized in that: The lifting mechanism includes a lifting plate connected to the lower clamp, and cylinders symmetrically arranged on both sides of the lifting plate, with the cylinders being telescopically connected to the lifting plate.

8. The lower clamp assembly of a core leak detector according to claim 7, characterized in that: A horizontally arranged synchronous plate is provided above the lifting plate. The synchronous plate has a limiting hole that is axially aligned with the lower clamp. The limiting hole is sleeved on the outside of the lower clamp, and a limiting groove is provided between the synchronous plate and the lower clamp.

9. The lower clamp assembly of a core leak detector according to claim 8, characterized in that: The lower clamps are arranged in multiple sets side by side, and the cylinders corresponding to each set of lower clamps are arranged in series. The synchronizing plate is placed on top of the lifting plate corresponding to each set of lower clamps.

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