A powder metallurgy work die steel preparation with a helium leak detection device

Abstract

The application discloses a powder metallurgy work die steel preparation uses a cover helium leak detection device, belongs to the related technical field of powder metallurgy, including fixed base and leak detector host computer, the fixed base is arranged on one side of leak detector host computer, the upper end of the fixed base is movably installed with a lifting frame, and the inside middle part position of the lifting frame is fixedly installed with a sampling gun used for docking a cover kit, the outer surface of the upper end of the fixed base is movably installed with two groups of movable clamping plates used for positioning the cover kit, the outer surface of one side of the movable clamping plate is movably installed with two groups of inclined clamping heads, the sampling gun is provided with a filter pad, and the lower end of the sampling gun is fixedly installed with a docking piece; the integrated detection structure can integrate the vacuumizing, helium injection and leak point detection links, shorten the efficiency during the cover helium leak detection operation, the quick docking structure is provided, powder suction into the leak detector host computer is avoided, and the stability is improved.

Description

Technical Field

[0001] This invention belongs to the field of powder metallurgy technology, specifically a helium leak detection device for preparing powder metallurgy tool steel. Background Technology

[0002] The core of the helium leak detection device for powder metallurgy cladding is an airtightness testing system with a helium mass spectrometer as the main equipment. It is primarily used after hot isostatic pressing (HIP) or powder filling and sealing to accurately check for micro-leakage in the weld seams and body of the metal cladding. First, helium is introduced into the cladding (positive pressure suction gun method) or the cladding is placed in a helium environment (vacuum chamber method). Then, utilizing the characteristics of helium's small molecular weight and extremely low background concentration, mass spectrometry is used to capture the leaked helium ion signal, thereby quantitatively detecting the leak rate. This step is crucial; if the cladding is not sealed tightly, external gas intrusion during subsequent high-temperature and high-pressure processing will cause the powder to fail to compact, leaving residual pores inside the part and rendering it unusable. The helium leak detection device in this application belongs to the positive pressure suction gun method.

[0003] Patent document CN111649878B describes a helium leak detection device for a barrel, including a frame, a leak detection cover, a vacuum pump, a helium leak detector, a worktable, and a lifting mechanism. The leak detection cover is located at the upper front end of the frame and is connected to the vacuum pump and the helium leak detector. The worktable is located directly below the leak detection cover and is used to place the barrel. The lifting mechanism is located at the front of the frame and is used to drive the worktable up and down. A conveyor frame for conveying the barrel to the worktable is provided on one side of the worktable, and a limiting mechanism for restricting the barrel on the worktable is provided on the other side of the worktable.

[0004] Existing helium leak detection devices have certain shortcomings in use. The aforementioned helium leak detection devices require sequential operations of evacuating the tank, injecting helium, and detecting leaks. Different operations require different equipment, making it impossible to integrate the entire inspection process and reducing the work efficiency of helium leak detection. Secondly, during leak detection, metal powder inside the casing is easily sucked into the helium leak detector, affecting the normal operation of the equipment. It also lacks a powder filtration structure and has limited functionality. Summary of the Invention

[0005] This invention provides a helium leak detection device for the preparation of powder metallurgy tool steel, which solves the problems of existing technologies that cannot integrate the entire inspection process, thus reducing the efficiency of helium leak detection; secondly, during leak detection, metal powder inside the sheath is easily sucked into the helium leak detector, affecting the normal operation of the equipment, and lacking a powder filtration structure, resulting in limited functionality. A helium leak detection device for preparing powder metallurgy tool steel includes a fixed base and a leak detector main unit. The fixed base is located on one side of the leak detector main unit. A lifting frame is movably installed on the upper end of the fixed base, and a sampling gun for docking with the package is fixedly installed at the middle of the inner side of the lifting frame. Two sets of movable clamping plates for positioning the package are movably installed on the outer surface of the upper end of the fixed base. Two sets of inclined clamping heads are movably installed on one side of the outer surface of the movable clamping plates. A filter pad is provided on the sampling gun, and a docking part is fixedly installed on the outer surface of the lower end of the sampling gun.

[0006] As a further technical solution of the present invention, the fixed base and the lifting frame are driven by two sets of lifting push rods. The middle part of the lifting frame is provided with a fixing sleeve for fixing the sampling gun. The user places the package on the upper end of the fixed base and uses the fixed base to drive the lifting frame, so that the lifting frame moves the sampling gun down, thereby completing the sealing connection between the docking part at the lower end of the sampling gun and the docking nozzle of the package. During the airtightness test of the package, the sealing connection operation is completed quickly.

[0007] As a further technical solution of the present invention, the two sets of inclined clamps are arranged in a mirror symmetrical manner along the middle of the movable clamping plate. The two sets of inclined clamps are driven by a bidirectional screw. In use, according to the size of the package, the bidirectional screw is driven by a motor, so that the bidirectional screw uses its surface bidirectional thread structure to drive the two sets of inclined clamps to move towards each other at the same time, so that the four sets of inclined clamps can be locked on the outer surface of the package at the same time after moving, so that the package is placed at the upper middle position of the fixed base.

[0008] As a further technical solution of the present invention, the movable card plate and the fixed base are driven by a transverse push rod. Guide rods are provided on both sides of the transverse push rod between the movable card plate and the fixed base. During operation, the package is placed on the upper end of the fixed base, and the movable card plate is moved by the transverse push rod, so that the movable card plate drives the inclined card head to move horizontally. The positions of the movable card plate and the inclined card head are pre-adjusted according to the cross-sectional size of the package, so that after the two sets of movable card plates complete the movement adjustment, the package is moved to the middle position of the fixed base. This allows the lower end of the sampling gun to accurately align with the docking nozzle of the package when the lifting push rod drives the sampling gun to move down.

[0009] As a further technical solution of the present invention, one side of the outer surface of the inclined card head is an inclined structure, and the guide rod and the fixed base are movably connected. By utilizing the inclined structure on the side of the inclined card head, the inclined card head can be connected to the outer surface of the package kit. Furthermore, the setting of the guide rod can improve the stability of the moving card plate when it moves.

[0010] As a further technical solution of the present invention, a lower chuck is fixedly installed on the outer surface of the top of the sampling gun, and an upper chuck is provided on the upper part of the lower chuck. The upper chuck and the lower chuck are fixed together by threads. The arrangement of the lower chuck and the upper chuck plays an auxiliary role in fixing the filter pad during installation.

[0011] As a further technical solution of the present invention, the filter pad is disposed between the lower chuck and the upper chuck. The upper end of the upper chuck and the leak detector main unit are fixed together by a gas tube. The leak detector main unit includes an analyzer, a collecting electrode and a vacuum pumping system, which is used to perform mass spectrometry analysis on the inhaled gas and quantitatively display the leak rate. The filter pad prevents dust and impurities from entering the leak detector main unit. During operation, the inside of the package is first evacuated, the leak detector main unit is switched to the gas filling state, and then the leak detector main unit is used to inject helium gas from the helium cylinder into the inside of the package. After reaching the specified pressure, the valve is closed and left to stand for a period of time to allow the gas to be evenly distributed in the package. The leak detector main unit is then started to enter the leak detection state. After the background value stabilizes, the sampling gun is held close to the suspicious parts of the package, such as welds, seals, joints and other surfaces, and moved while keeping the sampling gun nozzle about one to three millimeters away from the surface. If a leak is encountered, the internal helium gas escapes and is sucked in by the sampling gun. The leak detector main unit displays the leak rate value and triggers an audible and visual alarm, thereby locating the leak point.

[0012] As a further technical solution of the present invention, the docking component includes a sealing sleeve and a sealing plug. The sealing plug is located at the lower middle part of the sealing sleeve. The inner side of the sealing sleeve is provided with an arc-shaped convex ring, and the outer surface of the sealing plug is provided with an annular arc-shaped groove. By using the sealing sleeve and the sealing plug, the sealing performance of the package can be improved when the package is used for helium fast charging.

[0013] As a further technical solution of the present invention, the upper middle part of the package kit is provided with a docking nozzle, and a docking sleeve is fixedly sleeved on the upper outer surface of the docking nozzle. The outer surface of the docking sleeve is suitable for having an annular arc groove for use with the sealing sleeve, and the inner surface of the docking sleeve is provided with an arc-shaped protrusion for use with the sealing plug. When the lifting push rod drives the sampling gun to move down, the docking parts and the lifting frame are docked, and the docking sleeve is stuck between the sealing sleeve and the sealing plug, so that the arc-shaped protrusion and the annular arc groove of the docking sleeve, the sealing sleeve and the sealing plug are docked with each other, thereby improving their sealing performance.

[0014] As a further technical solution of the present invention, a helium cylinder is provided on one side of the leak detector main unit. The leak detector main unit and the helium cylinder are connected by a pipe. The leak detector main unit integrates two functions: inflation and detection. During inflation, the valve of the helium cylinder is opened, and the pump in the leak detector main unit fills the helium cylinder into the package kit. At the same time, the valve of the package kit is closed, so that the helium is placed inside the package kit. The sampling gun and the fixing sleeve are spliced ​​and fixed by a slot structure, so that the sampling gun can be removed from the fixing sleeve. During helium detection, the sampling gun is removed and the package kit is tested.

[0015] The beneficial effects of the present invention are as follows: By setting a fixed base and a docking part, the present invention enables the helium leak detection device for powder metallurgy tool steel preparation to have an integrated detection structure when it is used. This integrates the evacuation, helium injection and leak detection steps, thereby shortening the efficiency of the helium leak detection operation. In daily operation, the package is placed on the upper end of the fixed base. The horizontal push rod drives the moving plate, causing it to move and slide the inclined clamps. A motor drives a bidirectional lead screw, whose bidirectional thread structure simultaneously drives two sets of inclined clamps to move towards each other. This allows all four sets of inclined clamps to simultaneously engage with the outer surface of the package. The positions of the moving plate and inclined clamps are pre-adjusted according to the cross-sectional size of the package. After the two moving plates have completed their adjustment, the package is moved to the center of the fixed base. This ensures that when the lifting push rod drives the sampling gun downwards, the docking part at the lower end of the sampling gun precisely aligns with the docking nozzle of the package. The inside of the package is first evacuated. The leak detector main unit... A vacuum pump is used in conjunction with a sampling gun to evacuate the inside of the package. The sampling gun has both evacuation and injection functions. The leak detector is switched to the inflation mode, and then the leak detector is used in conjunction with the pump to inject helium from the helium cylinder into the inside of the package. After reaching the specified pressure, the valve of the package is closed and left to stand for a period of time to allow the gas to be evenly distributed inside the package. The valve of the helium cylinder is closed, and the leak detector is started to enter the leak detection mode. After the background value stabilizes, the sampling gun and the fixed sleeve are separated. The sampling gun is held close to the suspected parts of the package, such as welds, seals, and joints, and moved along the surface, keeping the sampling gun nozzle about one to three millimeters away from the surface. If a leak is encountered, the internal helium escapes and is sucked into the sampling gun. The leak detector displays the leak rate value and triggers an audible and visual alarm, thus locating the leak point. By setting up docking parts and filter pads, the helium leak detection device for powder metallurgy tool steel preparation is made to have a quick docking structure when in use, while avoiding powder being sucked into the leak detector main unit, thus optimizing the stability of its integrated leak detection structure. During routine operation, the mating parts utilize a sealing sleeve and a sealing plug to improve the sealing performance during helium fast charging of the package. When the lifting push rod drives the sampling gun downward, the mating parts and the lifting frame align, causing the mating sleeve to lock between the sealing sleeve and the sealing plug. This allows the arc-shaped convex ring and annular arc groove of the mating sleeve, sealing sleeve, and sealing plug to align with each other, improving the sealing performance. Secondly, the sampling gun has a dust filter structure at one end, which separates metal powder mixed in with helium through the filter pad, preventing powder from entering the interior of the leak detector main unit. Attached Figure Description To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an overall structural diagram of the fixed base in this invention; Figure 3 This is an overall structural diagram of the sampling gun in this invention; Figure 4 This is a planar structural diagram of the docking component in this invention.

[0017] In the diagram: 1. Fixed base; 2. Moving pallet; 3. Package assembly; 4. Lifting push rod; 5. Sampling gun; 6. Gas tube; 7. Leak detector main unit; 8. Helium cylinder; 9. Lifting frame; 10. Guide rod; 11. Lateral push rod; 12. Angled chuck; 13. Connecting part; 14. Filter pad; 15. Lower chuck; 16. Upper chuck; 17. Sealing sleeve; 18. Sealing plug; 19. Connecting nozzle; 20. Connecting sleeve; 21. Fixing sleeve; 22. Bidirectional lead screw. Detailed Implementation

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figures 1-4As shown, a helium leak detection device for preparing powder metallurgy tool steel includes a fixed base 1 and a leak detector main unit 7. The fixed base 1 is located on one side of the leak detector main unit 7. A lifting frame 9 is movably installed on the upper end of the fixed base 1, and a sampling gun 5 for docking with the package 3 is fixedly installed at the middle of the inner side of the lifting frame 9. Two sets of movable clamping plates 2 for positioning the package 3 are movably installed on the outer surface of the upper end of the fixed base 1. Two sets of inclined clamping heads 12 are movably installed on one side of the outer surface of the movable clamping plate 2. A filter pad 14 is provided on the upper part of the sampling gun 5, and a docking part 13 is fixedly installed on the outer surface of the lower end of the sampling gun 5.

[0020] The fixed base 1 and the lifting frame 9 are driven by two sets of lifting push rods 4. The middle part of the lifting frame 9 is provided with a fixing sleeve 21 for fixing the sampling gun 5. The user places the package 3 on the upper end of the fixed base 1 and uses the fixed base 1 to drive the lifting frame 9, so that the lifting frame 9 moves the sampling gun 5 down, thereby completing the sealing docking between the docking part 13 at the lower end of the sampling gun 5 and the docking nozzle 19 of the package 3. During the airtightness test of the package 3, the sealing docking operation is completed quickly.

[0021] Two sets of inclined clamps 12 are arranged in a mirror symmetrical manner along the middle of the movable clamping plate 2. The two sets of inclined clamps 12 are driven by a bidirectional screw 22. In use, according to the size of the package 3, the bidirectional screw 22 is driven by a motor, so that the bidirectional screw 22 uses its surface bidirectional thread structure to drive the two sets of inclined clamps 12 to move towards each other at the same time, so that the four sets of inclined clamps 12 can be locked on the outer surface of the package 3 at the same time after moving, so that the package 3 is placed at the upper middle position of the fixed base 1.

[0022] The movable pallet 2 and the fixed base 1 are driven by a transverse push rod 11. Guide rods 10 are provided on both sides of the transverse push rod 11 between the movable pallet 2 and the fixed base 1. During operation, the package 3 is placed on the upper end of the fixed base 1, and the movable pallet 2 is moved by the transverse push rod 11, so that the movable pallet 2 drives the inclined plate head 12 to move horizontally. The positions of the movable pallet 2 and the inclined plate head 12 are pre-adjusted according to the cross-sectional size of the package 3, so that after the two sets of movable pallets 2 have completed the movement adjustment, the package 3 is moved to the middle position of the fixed base 1. This allows the lifting push rod 4 to drive the sampling gun 5 to move down, so that the docking part 13 at the lower end of the sampling gun 5 can be accurately docked with the docking nozzle 19 of the package 3.

[0023] The outer surface of one side of the inclined card head 12 is an inclined structure. The guide rod 10 and the fixed base 1 are movably connected. By utilizing the inclined structure on the side of the inclined card head 12, the inclined card head 12 can be connected to the outer surface of the package 3. In addition, the setting of the guide rod 10 can improve the stability of the moving card plate 2 when it moves.

[0024] A lower chuck 15 is fixedly installed on the top outer surface of the sampling gun 5. An upper chuck 16 is provided on the upper part of the lower chuck 15. The upper chuck 16 and the lower chuck 15 are fixed together by threads. The arrangement of the lower chuck 15 and the upper chuck 16 plays an auxiliary role in fixing the filter pad 14.

[0025] The filter pad 14 is positioned between the lower chuck 15 and the upper chuck 16. The upper end of the upper chuck 16 is connected and fixed to the leak detector main unit 7 via a gas tube 6. The leak detector main unit 7 includes an analyzer, a collecting electrode, and a vacuum pumping system, used for mass spectrometry analysis of the inhaled gas and quantitative display of the leak rate. The filter pad 14 prevents dust and impurities from entering the leak detector main unit 7. During operation, the inside of the package 3 is first evacuated, the leak detector main unit 7 is switched to the gas filling state, and then the leak detector main unit 7 is used to fill the helium cylinder 8. Helium gas is injected into the interior of package 3. After reaching the specified pressure, the valve is closed and the mixture is left to stand for a period of time to allow the gas to be evenly distributed inside package 3. The leak detector host 7 is then started to enter the leak detection state. After the background value stabilizes, the sampling gun 5 is held close to the suspected parts of package 3, such as welds, seals, and joints. The sampling gun 5 is moved while keeping the nozzle about one to three millimeters away from the surface. If a leak is encountered, the internal helium gas escapes and is sucked into the sampling gun 5. The leak detector host 7 displays the leak rate value and triggers an audible and visual alarm, thus locating the leak point.

[0026] The docking component 13 includes a sealing sleeve 17 and a sealing plug 18. The sealing plug 18 is located at the lower middle part of the sealing sleeve 17. The inner side of the sealing sleeve 17 is provided with an arc-shaped protrusion ring, and the outer surface of the sealing plug 18 is provided with an annular arc-shaped groove. By using the sealing sleeve 17 and the sealing plug 18, the sealing performance of the package 3 can be improved during the helium fast charging operation.

[0027] The upper middle part of the package 3 is provided with a docking nozzle 19. The upper outer surface of the docking nozzle 19 is fixedly fitted with a docking sleeve 20. The outer surface of the docking sleeve 20 is suitable for having an annular arc groove for use with the sealing sleeve 17, and the inner surface of the docking sleeve 20 is provided with an arc-shaped protrusion for use with the sealing plug 18. When the lifting push rod 4 drives the sampling gun 5 to move down, the docking part 13 and the lifting frame 9 are docked, and the docking sleeve 20 is stuck between the sealing sleeve 17 and the sealing plug 18, so that the arc-shaped protrusion and the annular arc groove of the docking sleeve 20, the sealing sleeve 17 and the sealing plug 18 are docked with each other, improving their sealing performance.

[0028] A helium cylinder 8 is installed on one side of the leak detector main unit 7. The leak detector main unit 7 and the helium cylinder 8 are connected by a pipe. The leak detector main unit 7 integrates two functions: gas filling and detection. During the gas filling operation, the valve of the helium cylinder 8 is opened, and the pump in the leak detector main unit 7 fills the helium in the helium cylinder 8 into the package 3. At the same time, the valve of the package 3 is closed, so that the helium is placed inside the package 3. The sampling gun 5 and the fixing sleeve 21 are spliced ​​and fixed by a slot structure, so that the sampling gun 5 can be removed from the fixing sleeve 21. During the helium detection operation, the sampling gun 5 is removed to test the package 3.

[0029] A helium leak detection device for preparing powder metallurgy tool steel is disclosed. In use, the package 3 is placed on the upper end of the fixed base 1. A transverse push rod 11 drives a moving clamping plate 2, causing the moving clamping plate 2 to move the inclined clamping heads 12. A motor drives a bidirectional lead screw 22, which, through its bidirectional threaded structure, simultaneously drives two sets of inclined clamping heads 12 to move towards each other. This allows all four sets of inclined clamping heads 12 to simultaneously engage with the outer surface of the package 3. The positions of the moving clamping plate 2 and the inclined clamping heads 12 are pre-adjusted according to the cross-sectional size of the package 3. After the two sets of moving clamping plates 2 have completed their adjustment, the package 3 is moved to the middle position of the fixed base 1. This allows the lifting push rod 4 to precisely align the docking part 13 at the lower end of the sampling gun 5 with the docking nozzle 19 of the package 3 when the sampling gun 5 is moved downwards. The inside of the package 3 is evacuated. The leak detector host 7 uses a vacuum pump in conjunction with the sampling gun 5 to evacuate the inside of the package 3. The sampling gun 5 has both evacuation and injection functions. The leak detector host 7 is switched to the inflation state. Then, the leak detector host 7, in conjunction with the pump, injects helium from the helium cylinder 8 into the inside of the package 3. After reaching the specified pressure, the valve of the package 3 is closed and left to stand for a period of time to allow the gas to be evenly distributed inside the package 3. The valve of the helium cylinder 8 is closed, and the leak detector host 7 is started to enter the leak detection state. After the background value stabilizes, the sampling gun 5 is separated from the fixing sleeve 21. The sampling gun 5 is held close to the suspected parts of the package 3, such as welds, seals, and joints, and moved while keeping the nozzle of the sampling gun 5 about one to three millimeters away from the surface. If a leak is encountered, the internal helium escapes and is sucked into the sampling gun 5. The leak detector host 7 displays the leak rate value and triggers an audible and visual alarm, thereby locating the leak point.

[0030] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A helium leak detection device for preparing powder metallurgy tool steel, characterized in that, The device includes a fixed base (1) and a leak detector main unit (7). The fixed base (1) is located on one side of the leak detector main unit (7). A lifting frame (9) is movably installed on the upper end of the fixed base (1), and a sampling gun (5) for docking the package kit (3) is fixedly installed in the middle of the inner side of the lifting frame (9). Two sets of movable clamps (2) for positioning the package kit (3) are movably installed on the outer surface of the upper end of the fixed base (1). Two sets of inclined clamps (12) are movably installed on the outer surface of one side of the movable clamps (2). A filter pad (14) is provided on the upper part of the sampling gun (5), and a docking part (13) is fixedly installed on the outer surface of the lower end of the sampling gun (5).

2. The helium leak detection device for preparing powder metallurgy tool steel according to claim 1, characterized in that, The fixed base (1) and the lifting frame (9) are driven by two sets of lifting push rods (4). The middle part of the lifting frame (9) is provided with a fixing sleeve (21) for fixing the sampling gun (5).

3. The helium leak detection device for preparing powder metallurgy tool steel according to claim 2, characterized in that, Two sets of inclined clamps (12) are arranged in a mirror symmetrical manner along the middle of the movable clamp plate (2), and the two sets of inclined clamps (12) are driven by a two-way screw (22).

4. The helium leak detection device for preparing powder metallurgy tool steel according to claim 3, characterized in that, The movable plate (2) and the fixed base (1) are driven by a transverse push rod (11), and guide rods (10) are provided on both sides of the transverse push rod (11) between the movable plate (2) and the fixed base (1).

5. The helium leak detection device for preparing powder metallurgy tool steel according to claim 4, characterized in that, The outer surface of one side of the inclined clamp (12) is an inclined structure, and the guide rod (10) and the fixed base (1) are movably connected.

6. The helium leak detection device for preparing powder metallurgy tool steel according to claim 1, characterized in that, The sampling gun (5) has a lower chuck (15) fixedly installed on its top outer surface, and an upper chuck (16) is provided on the upper part of the lower chuck (15). The upper chuck (16) and the lower chuck (15) are fixed together by threads.

7. The helium leak detection device for preparing powder metallurgy tool steel according to claim 6, characterized in that, The filter pad (14) is located between the lower chuck (15) and the upper chuck (16), and the upper end of the upper chuck (16) is connected and fixed to the leak detector host (7) through the air pipe (6).

8. The helium leak detection device for preparing powder metallurgy tool steel according to claim 7, characterized in that, The docking component (13) includes a sealing sleeve (17) and a sealing plug (18). The sealing plug (18) is located at the lower middle part of the sealing sleeve (17). The inner side of the sealing sleeve (17) is provided with an arc-shaped protrusion ring, and the outer surface of the sealing plug (18) is provided with an annular arc-shaped groove.

9. A helium leak detection device for preparing powder metallurgy tool steel according to claim 8, characterized in that, The upper middle part of the package (3) is provided with a docking nozzle (19), and a docking sleeve (20) is fixedly sleeved on the upper outer surface of the docking nozzle (19). The outer surface of the docking sleeve (20) is suitable for having an annular arc groove for use with the sealing sleeve (17), and the inner surface of the docking sleeve (20) is provided with an arc-shaped protrusion for use with the sealing plug (18).

10. The helium leak detection device for preparing powder metallurgy tool steel according to claim 1, characterized in that, A helium cylinder (8) is provided on one side of the leak detector host (7), and the leak detector host (7) and the helium cylinder (8) are connected by a pipe.

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