Pipe core leak detection machine

Abstract

The utility model discloses a tube core leak detection machine, which is characterized in that a liftable mold closing mechanism is arranged above an upper clamp, a guide rod is inserted into the mold closing mechanism, a spring is sleeved on the outer side of the guide rod, the guide rod is connected with the mold closing mechanism in a sliding manner, and the top end and the bottom end of the guide rod are respectively and movably abutted against the mold closing mechanism. The upper clamp is connected with the mold closing mechanism through a guide rod; an exhaust pipe inserted into the pipe core, a sealing element capable of being extruded and deformed and a locking mechanism for driving the lower clamp to extrude the sealing element are arranged below the lower clamp, the sealing element is sleeved on the outer side of the pipe core, and the exhaust pipe movably abuts against the pipe core through the sealing element. According to the utility model, the guide rod and the mold closing mechanism slide relatively, the spring is gradually compressed, and the upper clamp gradually abuts against the lower clamp, so that flexible extrusion is realized, and the sealing performance between the upper clamp and the lower clamp is improved. Meanwhile, the lower clamp extrudes the sealing piece to enable the sealing piece to deform transversely, the sealing piece seals the gap between the exhaust pipe and the pipe core, and the sealing performance between the lower clamp and the pipe core is improved.

Description

Technical Field

[0001] This utility model relates to the field of magnetron equipment technology, and in particular to a leak detection machine for a magnetron core. 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. The device includes an upper clamp and a lower clamp, both cylindrical structures with openings on one side, and the openings are positioned opposite each other. The inner diameter of the upper clamp is larger than the outer diameter of the tube core. Driven by a cylinder, a telescopic shaft moves a first support plate downwards, causing the upper clamp to press against and cover the outside of the cathode and anode assemblies, with the opening of the upper clamp and the second support plate in contact. However, the aforementioned patent uses a rigid compression seal between the upper and lower clamps, and a sealing ring between the lower clamp and the tube core. The effectiveness of these two sealing measures is generally limited, making it difficult to ensure a sealed environment for tube core leak detection. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a leak detection machine for tube cores.

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

[0006] A leak detection machine for tube cores includes an upper clamp and a lower clamp that overlap each other, the tube core is placed inside the lower clamp, and the upper clamp and lower clamp are isolated after being overlapped, characterized in that:

[0007] The upper clamp is provided with a liftable mold closing mechanism. The mold closing mechanism is fitted with a guide rod, and a spring is sleeved on the outside of the guide rod. The guide rod is slidably connected to the mold closing mechanism, and its top and bottom ends are respectively in movable contact with the mold closing mechanism. The upper clamp is connected to the mold closing mechanism through the guide rod.

[0008] The lower clamp is provided with an air extraction pipe that is inserted into the tube core, a deformable seal, and a locking mechanism that drives the lower clamp to squeeze the seal. The seal is sleeved on the outside of the tube core, and the air extraction pipe moves against the tube core through the seal.

[0009] Preferably, the mold closing mechanism includes a pressure plate for inserting the guide rod, and a mold closing cylinder connected to the pressure plate for lifting and lowering. The bottom end of the guide rod is connected to the upper clamp, and the top end of the guide rod passes through the pressure plate.

[0010] Preferably, the guide rod has outwardly extending flanges at both the top and bottom ends, the top end of the spring abuts against the pressure plate, and the bottom end of the spring abuts against the upper clamp through the flange.

[0011] Preferably, the upper clamp has an air chamber with an opening facing downwards, the air chamber covers the upper part of the tube core, and has a first air hole communicating with the outside, the first air hole being connected to an air source.

[0012] Preferably, the guide rod has a hollow structure and a through second inflation hole inside. One end of the second inflation hole is connected to the inflation chamber, and the other end of the second inflation hole is connected to an air source.

[0013] Preferably, the lower clamp has an upward-opening suction chamber, which is connected to the lower part of the tube core and has a fixing hole at the bottom that communicates with the suction pipe. The tube core is inserted into the fixing hole and extends into the suction pipe.

[0014] Preferably, the sealing element has a multi-layer structure, including a rubber ring and a receiving ring arranged coaxially, one end of the receiving ring being in movable contact with the lower clamp, and the other end of the receiving ring being connected to the rubber ring.

[0015] Preferably, the top of the extraction pipe is provided with an installation groove for placing the sealing element. The installation groove and the sealing element are coaxially arranged, and the inner and outer sides of the sealing element are respectively in contact with the pipe core and the installation groove.

[0016] Preferably, the bottom of the lower clamp is provided with a pressing ring that matches the seal, the pressing ring extends into the mounting groove and movably abuts against the seal.

[0017] This utility model has the following beneficial effects:

[0018] This invention, by incorporating a guide rod and a sealing element, allows for leak detection. The top of the guide rod abuts against the mold-closing mechanism, and the upper clamp is suspended from the mechanism via the guide rod. The tube core is placed inside the lower clamp and connected to the extraction pipe. The mold-closing mechanism then moves the upper clamp downwards. After the upper and lower clamps align, the guide rod slides relative to the mold-closing mechanism, gradually compressing the spring and causing the upper clamp to press against the lower clamp, achieving flexible compression. This continues until the bottom of the guide rod abuts against the mold-closing mechanism, which then compresses the upper clamp to provide closing force, closing the upper and lower clamps and improving their sealing performance. Simultaneously, the locking mechanism moves the lower clamp downwards, compressing the sealing element and causing it to deform laterally. The sealing element closes the gap between the extraction pipe and the tube core, further improving the sealing performance between the lower clamp and the tube core and ensuring the tube core remains in a sealed environment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the state of the leak detector described in this utility model. Figure 1

[0020] Figure 2 This is a schematic diagram of the state of the leak detector described in this utility model. Figure 2

[0021] Figure 3 This is an assembly diagram of the upper clamp described in this utility model.

[0022] Figure 4 This is an assembly diagram of the lower clamp described in this utility model.

[0023] Figure 5 This is a schematic diagram of the structure of the sealing element described in this utility model.

[0024] Figure descriptions: 1. Core tube; 2. Upper clamp; 3. Lower clamp; 4. Guide rod; 5. Air extraction pipe; 6. Sealing element; 7. Locking mechanism; 8. Pressure plate; 9. Mold closing cylinder; 10. Flange; 11. First air inlet; 12. Second air inlet; 13. Fixing hole; 14. Rubber ring; 15. Receiving ring; 16. Pressing ring. 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 5 One embodiment provided by this utility model:

[0027] A leak detection machine for a core tube 1 includes an upper clamp 2 and a lower clamp 3 that overlap each other. The core tube 1 is placed inside the lower clamp 3, and the upper clamp 2 and the lower clamp 3 are isolated after being covered. A lifting mold closing mechanism is provided above the upper clamp 2. A guide rod 4 is inserted into the mold closing mechanism. A spring is sleeved on the outside of the guide rod 4. The guide rod 4 is slidably connected to the mold closing mechanism, and its top and bottom ends are respectively in movable contact with the mold closing mechanism. The upper clamp 2 is connected to the mold closing mechanism through the guide rod 4. Below the lower clamp 3, there is an air extraction pipe 5 that is inserted into the core tube 1, a deformable seal 6, and a locking mechanism 7 that drives the lower clamp 3 to squeeze the seal 6. The seal 6 is sleeved on the outside of the core tube 1, and the air extraction pipe 5 is in movable contact with the core tube 1 through the seal 6.

[0028] The upper clamp 2 and lower clamp 3 are vertically aligned, each with an opening facing each other. The lower clamp 3 cavity is used to place the die 1, corresponding to the lower part of the die 1 and communicating with the inside of the die 1. The lower clamp 3 cavity is connected to a vacuum pump, which can evacuate the inside of the die 1. The upper clamp 2 cavity is used to cover the die 1, corresponding to the upper part of the die 1 and communicating with the outside of the die 1. The upper clamp 2 cavity is connected to a gas source, which can fill the outside of the die 1 with helium or nitrogen. After the die 1 is placed in the lower clamp 3, the covered upper clamp 2 and lower clamp 3 are isolated, separating the cavities of the upper clamp 2 and lower clamp 3 into independent spaces to facilitate helium leak detection.

[0029] The mold clamping mechanism is located above the upper clamp 2 and is vertically adjustable, using a cylinder actuation method. The guide rod 4 is vertically positioned, inserted into the mold clamping mechanism, and slidably connected to it. The top and bottom ends of the guide rod 4 extend relative to the upper and lower sides of the mold clamping mechanism and are respectively equipped with flanges 10 for limiting movement. The top and bottom ends of the guide rod 4 movably abut against the upper and lower sides of the mold clamping mechanism, and the upper clamp 2 is connected to the mold clamping mechanism via the guide rod 4. A spring is sleeved on the outside of the guide rod 4, located between the mold clamping mechanism and the upper clamp 2. When the spring is compressed, it provides spring force to the upper clamp 2.

[0030] When the top of the guide rod 4 abuts against the upper side of the mold clamping mechanism, the upper clamp 2 is suspended from the mold clamping mechanism via the guide rod 4. When the mold clamping mechanism moves downward, it drives the upper clamp 2 downward until it aligns with the lower clamp 3. When the guide rod 4 slides relative to the mold clamping mechanism, the spring provides a downward spring force to the upper clamp 2, and the upper clamp 2 closes onto the lower clamp 3. During this process, the spring is gradually compressed, the spring force gradually increases, and the upper clamp 2 gradually presses against the lower clamp 3, thereby achieving flexible extrusion and improving the sealing between the upper clamp 2 and the lower clamp 3. At the same time, it facilitates the expulsion of air from inside the upper clamp 2, preventing air entrapment. When the bottom of the guide rod 4 abuts against the lower side of the mold clamping mechanism, the mold clamping mechanism presses against the upper clamp 2 via the guide rod 4. When the mold clamping mechanism moves downward, it applies a mold clamping force to the upper clamp 2, and the upper clamp 2 and the lower clamp 3 are sealed and pressed together.

[0031] The locking mechanism 7 is located below the lower clamp 3 and is vertically adjustable. It is activated by a cylinder and is connected to the lower clamp 3 for lifting. The bottom of the lower clamp 3 has a vertically penetrating fixing hole 13, which connects to the vacuum pipe 5. When the core tube 1 is placed in the lower clamp 3, it is inserted into the fixing hole 13, and the bottom of the core tube 1 is connected to the vacuum pipe 5, which is connected to the inside of the core tube 1. The vacuum pipe 5 is connected to a vacuum pump and a detection device, which can evacuate the inside of the core tube 1 and detect helium leakage. The sealing element 6 is located between the lower clamp 3 and the vacuum pipe 5 and is fitted onto the outside of the core tube 1. The sealing element 6 is made of rubber and can deform laterally when subjected to longitudinal compression. When the locking mechanism 7 moves downward, it moves the lower clamp 3 downward and compresses the sealing element 6, causing the sealing element 6 to deform laterally. The inner side of the sealing element 6 abuts against the outer side of the core tube 1, and the vacuum pipe 5 seals with the core tube 1 through the sealing element 6, improving the sealing between the lower clamp 3 and the core tube 1.

[0032] This invention, by setting a guide rod 4 and a sealing element 6, allows for leak detection. When the top of the guide rod 4 abuts against the mold-closing mechanism, the upper clamp 2 is suspended from the mold-closing mechanism via the guide rod 4, and the core tube 1 is placed inside the lower clamp 3, with the core tube 1 connected to the extraction pipe 5. Then, the mold-closing mechanism moves the upper clamp 2 downwards. After the upper clamp 2 aligns with the lower clamp 3, the guide rod 4 slides relative to the mold-closing mechanism, the spring is gradually compressed, and the upper clamp 2 gradually presses against the lower clamp 3, achieving flexible compression until the bottom of the guide rod 4 abuts against the mold-closing mechanism. The mold-closing mechanism then compresses the upper clamp 2, providing a mold-closing force, and the upper clamp 2 and lower clamp 3 close together, improving the sealing performance between them. Simultaneously, the locking mechanism 7 moves the lower clamp 3 downwards, causing the lower clamp 3 to compress the sealing element 6, causing it to deform laterally. The sealing element 6 seals the gap between the extraction pipe 5 and the core tube 1, further improving the sealing performance between the lower clamp 3 and the core tube 1, ensuring the core tube 1 is in a sealed environment.

[0033] In this embodiment, preferably, the mold closing mechanism includes a pressure plate 8 for inserting the guide rod 4, and a mold closing cylinder 9 that is vertically connected to the pressure plate 8. The bottom end of the guide rod 4 is connected to the upper clamp 2, and the top end of the guide rod 4 passes through the pressure plate 8.

[0034] The pressure plate 8 is horizontally positioned, while the mold-closing cylinder 9 is vertically positioned. The telescopic end of the mold-closing cylinder 9 is connected to the pressure plate 8 for lifting and lowering. The pressure plate 8 has a through hole, into which the pressure plate 8 is inserted and slidably connected perpendicularly. The guide rod 4 extends through the through hole at both ends, and its bottom end is connected to the upper clamp 2. When the top end of the guide rod 4 abuts against the upper side of the pressure plate 8, the upper clamp 2 is suspended from the pressure plate 8 by the guide rod 4. When the pressure plate 8 moves downward, it drives the upper clamp 2 to move downward until it aligns with the lower clamp 3. When the bottom end of the guide rod 4 abuts against the lower side of the pressure plate 8, the pressure plate 8 is pressed against the upper clamp 2 by the guide rod 4. When the pressure plate 8 moves downward, it applies a mold-closing force to the upper clamp 2, sealing and pressing the upper clamp 2 and the lower clamp 3 together.

[0035] In this embodiment, preferably, the top and bottom ends of the guide rod 4 are respectively provided with outwardly extending flanges 10, the top end of the spring abuts against the pressure plate 8, and the bottom end of the spring abuts against the upper clamp 2 through the flanges 10.

[0036] Flanges 10 are respectively located at the top and bottom ends of the guide rod 4, extending outwards, and can be in a ring shape. A spring is located between the pressure plate 8 and the upper clamp 2, with the top end of the spring abutting against the lower side of the pressure plate 8, and the bottom end abutting against the upper clamp 2 via flanges 10. When the guide rod 4 slides relative to the pressure plate 8, the pressure plate 8 presses the spring downwards, compressing the spring and subsequently pressing it downwards against the upper clamp 2. During this process, the spring is gradually compressed, the spring force gradually increases, and the upper clamp 2 gradually presses against the lower clamp 3, thus achieving flexible compression.

[0037] In this embodiment, preferably, the upper clamp 2 is provided with an air chamber that opens downwards, the air chamber covers the upper part of the tube core 1, and is provided with a first air hole 11 that communicates with the outside, and the first air hole 11 is connected to an air source.

[0038] The upper clamp 2 is a cylindrical structure with an internal, downward-opening inflation chamber that covers the upper part of the core 1 and communicates with the outside of the core 1. The first inflation port 11 is located inside the inflation chamber, positioned relative to the top of the upper clamp 2, and connected to an external gas source. The gas source can provide helium as the detection gas or nitrogen as the exhaust gas. The inflation chamber and the outside of the core 1 form a sealed space. Helium is filled into the outside of the core 1, while a vacuum is drawn inside the core 1. The detection device uses the vacuum level and helium concentration to detect whether the core 1 has any damage or gaps.

[0039] In this embodiment, preferably, the guide rod 4 has a hollow structure and a through second inflation hole 12 inside. One end of the second inflation hole 12 is connected to the inflation chamber, and the other end of the second inflation hole 12 is connected to the air source.

[0040] The guide rod 4 has a hollow structure, and the second inflation port 12 is located inside the guide rod 4, opening vertically downwards from the top of the guide rod 4 in a through-type structure. The bottom end of the second inflation port 12 is connected to the inflation chamber, and the top end of the second inflation port 12 is connected to the gas source. The first inflation port 11 and the second inflation port 12 provide two inflation channels, which can be filled with helium and nitrogen respectively, realizing the functions of helium leak detection and air removal.

[0041] In this embodiment, preferably, the lower clamp 3 is provided with an upward-opening suction chamber, which is connected to the lower part of the core tube 1, and the bottom is provided with a fixing hole 13 that communicates with the suction pipe 5. The core tube 1 is inserted into the fixing hole 13 and extends into the suction pipe 5.

[0042] The lower clamp 3 is a cylindrical structure with an upward-opening suction chamber inside. The suction chamber is attached to the lower part of the core 1 and communicates with the interior of the core 1. The fixing hole 13 is located at the bottom of the suction chamber and is a vertical through hole structure, communicating with the suction pipe 5. When the core 1 is placed in the lower clamp 3, the bottom of the core 1 is inserted into the fixing hole 13 and extends into the suction pipe 5. The suction pipe 5 and the interior of the core 1 form a sealed space. Helium is filled into the outside of the core 1, and a vacuum is drawn inside the core 1. The detection device detects whether there is any damage or gaps in the core 1 by measuring the vacuum degree and helium concentration.

[0043] In this embodiment, preferably, the sealing element 6 has a multi-layer structure, including a rubber ring 14 and a receiving ring 15 arranged coaxially. One end of the receiving ring 15 is in movable contact with the lower clamp 3, and the other end of the receiving ring 15 is connected to the rubber ring 14.

[0044] The sealing element 6 has a multi-layer structure, with the rubber ring 14 and the receiving ring 15 coaxially arranged and matching in shape. The receiving ring 15 is located in the upper layer and the receiving ring 15 is located in the lower layer. The top end of the receiving ring 15 is in movable contact with the lower clamp 3, and the bottom end of the receiving ring 15 is connected to the rubber ring 14. When the locking mechanism 7 moves the lower clamp 3 downward, the lower clamp 3 squeezes the receiving ring 15, and the receiving ring 15 squeezes the rubber ring 14. The receiving ring 15 ensures that when the lower clamp 3 presses down, the squeezing force acts vertically on the rubber ring 14, and the rubber ring 14 undergoes lateral deformation due to the longitudinal squeezing force.

[0045] In this embodiment, preferably, the top of the extraction pipe 5 is provided with an installation groove for placing the sealing element 6. The installation groove and the sealing element 6 are coaxially arranged, and the inner and outer sides of the sealing element 6 are respectively in contact with the pipe core 1 and the installation groove.

[0046] The mounting groove is located at the top of the extraction pipe 5 and is coaxially positioned relative to the inner side of the extraction pipe 5. It can be a stepped structure for placing the sealing element 6. The mounting groove and the sealing element 6 are coaxially positioned. After the sealing element 6 is placed in the mounting groove, the inner side of the sealing element 6 is opposite to the outer side of the tube core 1, and the outer side of the sealing element 6 is opposite to the inner side of the mounting groove. When the sealing element 6 is subjected to lateral deformation under compression, the inner and outer sides of the sealing element 6 abut against the tube core 1 and the mounting groove respectively, thereby sealing the gap between the tube core 1 and the extraction pipe 5 and achieving a sealing effect.

[0047] In this embodiment, preferably, the bottom of the lower clamp 3 is provided with a pressing ring 16 that matches the seal 6. The pressing ring 16 extends into the mounting groove and movably abuts against the seal 6.

[0048] The compression ring 16 is located at the bottom of the lower clamp 3, extending downwards from the bottom of the lower clamp 3 and matching the seal 6. The compression ring 16 extends into the mounting groove and slides perpendicularly with the mounting groove, with the bottom of the compression ring 16 movably abutting against the top of the seal 6. When the lower clamp 3 moves downwards, the compression ring 16 presses down on the seal 6. The compression ring 16 controls the surface of the pressing force, ensuring that the pressing force of the lower clamp 3 can act perpendicularly on the seal 6, causing the seal 6 to deform laterally.

[0049] 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 tube core leak detection machine, comprising a top clamp and a bottom clamp which are mutually closed, a tube core is placed in the bottom clamp, and the closed top clamp and bottom clamp are isolated, characterized in that: a closing mechanism which can be lifted is arranged above the top clamp, a guide rod is inserted into the closing mechanism, a spring is sleeved outside the guide rod, the guide rod is slidably connected with the closing mechanism, and the top and bottom ends of the guide rod are respectively movably abutted with the closing mechanism, and the top clamp is connected with the closing mechanism through the guide rod; an air extraction pipe which is inserted with the tube core, a seal which can be extruded and deformed, and a locking mechanism which drives the bottom clamp to extrude the seal are arranged below the bottom clamp, the seal is sleeved outside the tube core, and the air extraction pipe is movably abutted with the tube core through the seal. The closing mechanism comprises a pressing plate for inserting the guide rod, and a closing cylinder which is connected with the pressing plate in a lifting manner, the bottom end of the guide rod is connected with the top clamp, and the top end of the guide rod passes through the pressing plate. The top and bottom ends of the guide rod are respectively provided with flanges which extend outward, the top end of the spring is abutted with the pressing plate, and the bottom end of the spring is abutted with the top clamp through the flanges.

2. The die leak detection machine of claim 1, wherein: The top clamp is provided with an inflation cavity which is open downward, the inflation cavity covers the upper part of the tube core, and is provided with a first inflation hole which is communicated with the outside, and the first inflation hole is connected with a gas source.

3. The die leak detection machine of claim 2, wherein: The guide rod is a hollow structure, and is provided with a second inflation hole which penetrates through the inside, one end of the second inflation hole is communicated with the inflation cavity, and the other end of the second inflation hole is connected with the gas source.

4. The die leak testing machine of claim 1, wherein: The bottom clamp is provided with an air extraction cavity which is open upward, the air extraction cavity is received in the lower part of the tube core, and is provided with a fixed hole which is communicated with the air extraction pipe at the bottom, the tube core is inserted into the fixed hole and extends into the inside of the air extraction pipe.

5. The tube die leak detection machine of claim 4, wherein: The seal is a multi-layer structure, comprising a rubber ring and a receiving ring which are coaxially arranged, one end of the receiving ring is movably abutted with the bottom clamp, and the other end of the receiving ring is connected with the rubber ring.

6. The die leak testing machine of claim 1, wherein: The top part of the air extraction pipe is provided with a mounting groove for placing the seal, the mounting groove is coaxially arranged with the seal, and the inner and outer sides of the seal are respectively movably abutted with the tube core and the mounting groove.

7. The die leak detection machine of claim 6, wherein: The bottom part of the bottom clamp is provided with a pressing ring which is matched with the seal, the pressing ring extends into the mounting groove and is movably abutted with the seal.

8. The die leak testing machine of claim 1, wherein: ​ 9. The die leak detection machine of claim 8, wherein: ​

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