An explosion-proof vacuum box for front and rear helium inspection integrated machine

Abstract

The present invention discloses an explosion-proof vacuum box for a front and rear helium inspection machine, and relates to the technical field of vacuum boxes. The explosion-proof vacuum box for a front and rear helium inspection machine comprises a helium inspection box, a detection chamber is provided in the middle of the helium inspection box, a protective plate is fixedly installed on the outside of the helium inspection box, a guide frame is fixedly installed on the inner top wall and the inner bottom wall of the detection chamber, a box cover is movably installed on the inner wall of the guide frame, a telescopic base is fixedly installed on the inner bottom wall of the detection chamber, and a telescopic assembly is arranged in the middle of the telescopic base. An electromagnet is arranged to repel a magnetic block to drive a piston to move, thereby compressing the gas inside the compression chamber so that the sealing block seals the edge of the box cover, thereby ensuring the sealing of the helium inspection box, wherein the contraction hinged rod is driven to move by the pressure block, and the contraction hinged rod drives the hinged rod group to move so that the clamping block clamps the object to be inspected.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum boxes, in particular to an explosion-proof vacuum box used for a front and rear helium detection integrated machine. Background Art

[0002] With the development of China's manufacturing industry and industry, the localization rate of China's industrial accessories and parts is constantly increasing, and the production capacity is increasing day by day, so the requirements for product production quality and safety are also constantly increasing. The quality of accessories and parts directly affects the performance and stability of the product. Therefore, the airtightness test of parts is an important link to ensure safety and an important guarantee for improving product stability and safety. At present, the detection of parts is mostly done by helium detection method to detect its airtightness. According to the basic principle of helium leak detection, helium is used as a tracer gas, and helium is filled into the workpiece in a vacuum box. Then, the helium leak detector can quickly and accurately determine the helium recovery rate with high precision, so as to judge the quality of the parts.

[0003] The quality of the vacuum box directly affects the detection effect. The vacuum boxes on the market can meet the detection of most parts, but there are still some shortcomings that need to be improved. The safety performance of the existing vacuum box needs to be improved, so its explosion-proof performance is improved to ensure the stability of the vacuum box, and the sealing of the existing vacuum box needs to be improved. Since it is easy to damage the seal during multiple tests, thereby affecting the sealing of the vacuum box, the existing box does not have the function of automatic transportation and clamping of the test object. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides an explosion-proof vacuum box for a front and rear helium inspection integrated machine, which solves the problems that the traditional vacuum box does not have an explosion-proof function, has poor automation performance and poor sealing.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: an explosion-proof vacuum box for a front and rear helium inspection integrated machine, comprising a helium inspection box, a detection cavity is opened in the middle of the helium inspection box, a protective plate is fixedly installed on the outside of the helium inspection box, a guide frame is fixedly installed on the inner top wall and the inner bottom wall of the detection cavity, a box cover is movably installed on the inner wall of the guide frame, a telescopic base is fixedly installed on the inner bottom wall of the detection cavity, a telescopic assembly is arranged in the middle of the telescopic base, a sealing assembly is arranged in the middle of the guide frame, and a vacuum assembly is movably installed on the top of the telescopic base.

[0008] Furthermore, the telescopic assembly includes a telescopic frame, a motor, a threaded rod, and a threaded sleeve rod. A mounting groove is provided on the top of the telescopic base, the telescopic frame is fixedly installed on the inner wall of the mounting groove, a mounting groove is provided in the middle of the telescopic frame, the motor is fixedly installed on the inner wall of the mounting groove, the threaded rod is fixedly installed on the output end of the motor, and the threaded sleeve rod is movably installed on the outside of the threaded rod.

[0009] Furthermore, a threaded hole adapted to the threaded rod is opened in the middle of the threaded sleeve and the threaded teeth on the outside of the threaded rod are engaged with the threaded groove, wherein the bottom of the threaded sleeve is slidably connected to the inner wall of the telescopic frame, and the top of the threaded sleeve is fixedly connected to the vacuum assembly.

[0010] Furthermore, the sealing assembly includes an electromagnet 1, a compression chamber and a sealing block, wherein the electromagnet 1 is fixedly mounted in the middle of the guide frame, the compression chamber is opened in the middle of the guide frame, and the sealing block is movably mounted on the inner wall of the compression chamber.

[0011] Furthermore, the sealing assembly also includes a magnetic block 1, a piston, and a positioning spring. The piston is movably mounted on the inner wall of the compression chamber, the positioning spring is fixedly mounted on one end of the piston, a mounting groove is opened in the middle of the magnetic block 1, and the magnetic block 1 is fixedly mounted on the inner wall of the mounting groove.

[0012] Furthermore, the magnetic block 1 and the electromagnet 1 are parallel to each other, and the magnetic poles on one side of the electromagnet 1 are opposite to the magnetic poles on one side of the magnetic block 1 and have the same polarity relative to each other, and the other end of the positioning spring is fixedly connected to the inner wall of the compression chamber.

[0013] Furthermore, the vacuum assembly includes a vacuum box, a reinforcing rib, a base, a slider, and an explosion-proof plate. A slide groove is provided on the top of the telescopic base, the slider is movably installed on the inner wall of the slide groove, the base is fixedly installed on the top of the slider, the vacuum box is fixedly installed on the top of the base, the reinforcing rib is fixedly installed on the top of the base, and the explosion-proof plate is fixedly installed on the top of the vacuum box.

[0014] Furthermore, the vacuum assembly also includes a clamping assembly, which includes a clamping seat, a mounting groove, an electromagnet 2, and a spring column. The clamping seat is fixedly installed on the inner bottom wall of the vacuum box, the mounting groove is opened in the middle of the clamping seat, the electromagnet 2 is fixedly installed on the inner bottom wall of the mounting groove, and the spring column is fixedly installed on the inner bottom wall of the mounting groove.

[0015] Furthermore, the clamping assembly also includes a pressure block, a second magnetic block, an articulated rod group one, a retractable articulated rod, and a clamping block, wherein the pressure block is movably mounted on the outside of the spring column, the second magnetic block is fixedly mounted in the middle of the pressure block, the retractable articulated rod is movably mounted on the top of the pressure block, and the articulated rod group one is movably mounted on the front side of the clamping seat, wherein the articulated rod group one and the retractable articulated rod are movably connected by a pin, and the clamping block is fixedly mounted at one end of the articulated rod group one.

[0016] Furthermore, a movable hole adapted to the spring column is provided on the top of the pressing block, wherein the magnetic pole at the bottom of the second magnetic block is opposite to the magnetic pole at the top of the second electromagnet and the two opposite magnetic poles are parallel to each other.

[0017] (III) Beneficial effects

[0018] The present invention has the following beneficial effects:

[0019] 1. The explosion-proof vacuum box used for the front and rear helium inspection integrated machine realizes the effect of automatic retraction and extension of the vacuum box by setting a motor to drive the threaded rod to rotate, and the threaded rod drives the threaded sleeve rod to move, and then the stability of the vacuum box is increased by the coordinated use of reinforcing ribs and explosion-proof plates, thereby further preventing the vacuum box from bursting, thereby improving the safety of helium inspection.

[0020] 2. The explosion-proof vacuum box used for the front and rear helium inspection integrated machine is provided with an electromagnet to repel the magnetic block so that it drives the piston to move, thereby compressing the gas inside the compression chamber so that the sealing block seals the edge of the box cover, thereby ensuring the sealing of the helium inspection box, wherein the compression block drives the contraction hinged rod to move, and the contraction hinged rod drives the hinged rod group to move so that the clamping block clamps the object to be inspected.

[0021] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of an explosion-proof vacuum box for a front and rear helium detection integrated machine of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the vacuum box of the present invention;

[0024] Figure 3 This is a schematic diagram of the box cover structure of the present invention;

[0025] Figure 4 For the present invention Figure 3 A schematic diagram of the enlarged structure of the middle part A;

[0026] Figure 5 This is a schematic diagram of the telescopic base structure of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of the clamping seat of the present invention;

[0028] Figure 7 It is a schematic diagram of the telescopic frame structure of the present invention.

[0029] In the figure, 1, helium inspection box; 2, protective plate; 3, box cover; 4, vacuum box; 5, detection chamber; 6, reinforcing ribs; 7, explosion-proof plate; 8, base; 9, slider; 10, guide frame; 11, electromagnet 1; 12, compression chamber; 13, magnetic block 1; 14, piston; 15, positioning spring; 16, telescopic base; 17, telescopic frame; 18, clamping seat; 19, movable groove; 20, electromagnet 2; 21, spring column; 22, magnetic block 2; 23, pressure block; 24, hinged rod group 1; 25, retractable hinged rod; 26, clamping block; 27, motor; 28, threaded rod; 29, threaded sleeve rod. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0032] See also Figure 1-7 The embodiment of the present invention provides a technical solution: an explosion-proof vacuum box for a front and rear helium inspection integrated machine, comprising a helium inspection box 1, a detection chamber 5 is opened in the middle of the helium inspection box 1, a protective plate 2 is fixedly installed on the outer side of the helium inspection box 1, a guide frame 10 is fixedly installed on the inner top wall and the inner bottom wall of the detection chamber 5, a box cover 3 is movably installed on the inner wall of the guide frame 10, a telescopic base 16 is fixedly installed on the inner bottom wall of the detection chamber 5, a telescopic component is arranged in the middle of the telescopic base 16, a sealing component is arranged in the middle of the guide frame 10, and a vacuum component is movably installed on the top of the telescopic base 16.

[0033] Specifically, the telescopic assembly includes a telescopic frame 17, a motor 27, a threaded rod 28, and a threaded sleeve rod 29. A mounting groove is provided on the top of the telescopic base 16, and the telescopic frame 17 is fixedly installed on the inner wall of the mounting groove. A mounting groove is provided in the middle of the telescopic frame 17, and the motor 27 is fixedly installed on the inner wall of the mounting groove. The threaded rod 28 is fixedly installed on the output end of the motor 27, and the threaded sleeve rod 29 is movably installed on the outside of the threaded rod 28.

[0034] In this embodiment, a telescopic component is provided mainly for conveying the vacuum component, thereby conveying the component to be inspected to the interior of the inspection chamber 5, wherein the motor 27 rotates to drive the threaded sleeve 29 to move back and forth, thereby driving the vacuum box 4 to move.

[0035] Specifically, a threaded hole adapted to the threaded rod 28 is opened in the middle of the threaded sleeve 29, and the threaded teeth on the outside of the threaded rod 28 are engaged with the threaded groove, wherein the bottom of the threaded sleeve 29 is slidably connected to the inner wall of the telescopic frame 17, and the top of the threaded sleeve 29 is fixedly connected to the vacuum assembly.

[0036] In this embodiment, the threaded sleeve 29 is mainly used to drive the base 8 to move so as to realize automatic conveying of the inspection piece, wherein the bottom of the threaded sleeve 29 is fixedly connected to the inner bottom wall of the telescopic frame 17, thereby increasing the stability of the vacuum box 4.

[0037] Specifically, the sealing assembly includes an electromagnet 11, a compression chamber 12 and a sealing block, wherein the electromagnet 11 is fixedly mounted in the middle of the guide frame 10, the compression chamber 12 is opened in the middle of the guide frame 10, and the sealing block is movably mounted on the inner wall of the compression chamber 12.

[0038] In this embodiment, the compression chamber 12 is provided mainly to compress the gas inside it, thereby driving the sealing block to fit tightly with the box cover 3, thereby ensuring the sealing of the helium inspection box 1.

[0039] Specifically, the sealing assembly also includes a magnetic block 13, a piston 14, and a positioning spring 15. The piston 14 is movably mounted on the inner wall of the compression chamber 12, the positioning spring 15 is fixedly mounted on one end of the piston 14, and a mounting groove is opened in the middle of the magnetic block 13, and the magnetic block 13 is fixedly mounted on the inner wall of the mounting groove.

[0040] In this embodiment, the piston 14 is provided to compress the gas inside the compression chamber 12, thereby increasing the pressure inside the compression chamber 12, thereby achieving a sealing effect.

[0041] Specifically, the magnetic block 13 and the electromagnet 11 are parallel to each other, and the magnetic pole on one side of the electromagnet 11 is opposite to the magnetic pole on one side of the magnetic block 13 and the polarity of the relative magnetic poles is the same, and the other end of the positioning spring 15 is fixedly connected to the inner wall of the compression chamber 12.

[0042] In this embodiment, an electromagnet 11 is provided to drive a magnetic block 13, thereby driving the piston 14 to move, wherein the electromagnet 11 is electrically connected to an external circuit and generates a magnetic field, so that the magnetic block 13 is subjected to a repulsive force due to the same polarity of the relative magnetic poles.

[0043] Specifically, the vacuum assembly includes a vacuum box 4, a reinforcing rib 6, a base 8, a slider 9, and an explosion-proof plate 7. A slide groove is provided on the top of the telescopic base 16, the slider 9 is movably installed on the inner wall of the slide groove, the base 8 is fixedly installed on the top of the slider 9, the vacuum box 4 is fixedly installed on the top of the base 8, the reinforcing rib 6 is fixedly installed on the top of the base 8, and the explosion-proof plate 7 is fixedly installed on the top of the vacuum box 4.

[0044] In this embodiment, the reinforcing ribs 6 and the explosion-proof plate 7 are provided mainly to increase the stability of the vacuum box 4, thereby ensuring that the vacuum box 4 will not explode.

[0045] Specifically, the vacuum assembly also includes a clamping assembly, which includes a clamping seat 18, a movable groove 19, an electromagnet 20, and a spring column 21. The clamping seat 18 is fixedly installed on the inner bottom wall of the vacuum box 4, the movable groove 19 is opened in the middle of the clamping seat 18, the electromagnet 20 is fixedly installed on the inner bottom wall of the movable groove 19, and the spring column 21 is fixedly installed on the inner bottom wall of the movable groove 19.

[0046] In this embodiment, the spring column 21 is provided to guide the pressing block 23, thereby driving the pressing block 23 to move downward, thereby sealing the detection object.

[0047] Specifically, the clamping assembly also includes a pressure block 23, a second magnetic block 22, an articulated rod group 1 24, a retractable articulated rod 25, and a clamping block 26. The pressure block 23 is movably installed on the outside of the spring column 21, the second magnetic block 22 is fixedly installed in the middle of the pressure block 23, the retractable articulated rod 25 is movably installed on the top of the pressure block 23, and the articulated rod group 1 24 is movably installed on the front side of the clamping seat 18, wherein the articulated rod group 1 24 is movably connected to the retractable articulated rod 25 by a pin, and the clamping block 26 is fixedly installed at one end of the articulated rod group 1 24.

[0048] In this embodiment, a retractable hinged rod 25 is provided to drive the hinged rod group 24 to retract, thereby clamping the clamping block 26, thereby further clamping the object, wherein the hinged rod group 24 is connected by a plurality of connecting rods.

[0049] Specifically, a movable hole adapted to the spring column 21 is opened on the top of the pressing block 23, wherein the magnetic pole at the bottom of the second magnetic block 22 is opposite to the magnetic pole at the top of the second electromagnet 20, and the two opposite magnetic poles are parallel to each other.

[0050] In this embodiment, electromagnet 20 is provided to drive magnetic block 22 to move, thereby further driving pressure block 23 to move. Since the magnetic pole at the bottom of magnetic block 22 is opposite to the magnetic pole at the top of electromagnet 20 and the two relative magnetic poles are parallel to each other, magnetic block 22 is attracted, thereby further driving pressure block 23 to move downward.

[0051] When in use, the box cover 3 is opened, and then the motor 27 is energized. At this time, the threaded rod 28 will drive the threaded sleeve 29 to move back and forth along the inner wall of the telescopic frame 17. Since the threaded sleeve 29 is fixedly connected to the bottom of the base 8, the base 8 will drive the vacuum box 4 to move outward. When the vacuum box 4 moves to the outermost side along the inner wall of the telescopic base 16, the object to be detected is placed between the two clamping blocks 26, and then the electromagnet 20 is energized. At this time, the electromagnet 20 generates a magnetic field. Since the polarity of the relative magnetic poles of the magnetic block 22 and the electromagnet 20 is opposite, the magnetic block 22 is attracted and drives the pressing block 23 to move from top to bottom along the outer side of the spring column 21. At this time, the spring column The spring on the outside of 21 is compressed. When the pressure block 23 moves downward, it will drive the contraction hinge rod 25 to contract inward. Since the contraction hinge rod 25 is connected to the hinge rod group 1 24 through a pin, and the hinge rod group 1 24 is also connected to the clamping seat 18 through a pin, the hinge rod group 1 24 rotates around the pin, thereby further driving the clamping block 26 to move closer to each other, so as to clamp the object to be detected. When the object is clamped, the motor 27 is energized again to rotate in the opposite direction, thereby further driving the threaded sleeve rod 29 to move along the inside of the telescopic frame 17 toward the inner wall of the detection chamber 5, so that the vacuum box 4 completely enters the inside of the detection chamber 5. When the vacuum box 4 completely enters After that, the helium inspection box 1 is sealed by pushing the box cover 3. When the box cover 3 is completely closed, the electromagnet 11 is energized to generate a magnetic field. Since the magnetic block 13 in the middle of the piston 14 is parallel to the electromagnet 11 and the polarity of the relative magnetic poles is the same, the magnetic block 13 is subjected to a repulsive force, thereby further driving the piston 14 to compress the gas inside the compression chamber 12. The piston 14 stretches the positioning spring 15 during the movement. At this time, the positioning spring 15 stores a certain amount of elastic potential energy. At this time, the pressure inside the compression chamber 12 increases, thereby further driving the sealing block to seal the box cover 3, thereby ensuring the sealing inside the detection chamber 5. When the object is inspected, the helium inside is released. The electromagnetic body 11 is powered off, and the repulsive force on the magnetic block 13 disappears. The piston 14 is reset under the elastic potential energy of the positioning spring 15. The pressure inside the compression chamber 12 decreases. The sealing block is separated from the box cover 3. The box cover 3 is pulled open, and then the motor 27 is powered on. At this time, the threaded rod 28 drives the threaded sleeve 29 to move back and forth along the inner wall of the telescopic frame 17. Since the threaded sleeve 29 is fixedly connected to the bottom of the base 8, the base 8 drives the vacuum box 4 to move outward. Then, the electromagnetic body 20 is powered off, and the magnetic field generated by the electromagnetic body 20 disappears. The pressure block 23 moves from bottom to top along the outer side of the spring column 21 under the elastic force of the spring on the outer side of the spring column 21.This further drives the contraction hinge rod 25 and the hinge rod group 1 24 to expand, thereby releasing the clamping block 26 from clamping the object, and then taking out the inspected object.

[0052] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0053] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An explosion-proof vacuum box for a front and rear helium inspection integrated machine, comprising a helium inspection box (1), characterized in that: A detection chamber (5) is provided in the middle of the helium detection box (1), a protective plate (2) is fixedly installed on the outer side of the helium detection box (1), a guide frame (10) is fixedly installed on the inner top wall and the inner bottom wall of the detection chamber (5), a box cover (3) is movably installed on the inner wall of the guide frame (10), a telescopic base (16) is fixedly installed on the inner bottom wall of the detection chamber (5), a telescopic component is arranged in the middle of the telescopic base (16), a sealing component is arranged in the middle of the guide frame (10), and a vacuum component is movably installed on the top of the telescopic base (16); The telescopic assembly comprises a telescopic frame (17), a motor (27), a threaded rod (28), and a threaded sleeve rod (29); a mounting groove is provided on the top of the telescopic base (16); the telescopic frame (17) is fixedly mounted on the inner wall of the mounting groove; a mounting groove is provided in the middle of the telescopic frame (17); the motor (27) is fixedly mounted on the inner wall of the mounting groove; the threaded rod (28) is fixedly mounted on the output end of the motor (27); and the threaded sleeve rod (29) is movably mounted on the outer side of the threaded rod (28); The sealing assembly comprises an electromagnet (11), a compression chamber (12) and a sealing block, wherein the electromagnet (11) is fixedly mounted in the middle of the guide frame (10), the compression chamber (12) is opened in the middle of the guide frame (10), and the sealing block is movably mounted on the inner wall of the compression chamber (12); The sealing assembly further comprises a magnetic block (13), a piston (14), and a positioning spring (15); the piston (14) is movably mounted on the inner wall of the compression chamber (12); the positioning spring (15) is fixedly mounted on one end of the piston (14); a mounting groove is provided in the middle of the magnetic block (13); and the magnetic block (13) is fixedly mounted on the inner wall of the mounting groove; The vacuum assembly comprises a vacuum box (4), a reinforcing rib (6), a base (8), a slider (9), and an explosion-proof plate (7); a slide groove is provided on the top of the telescopic base (16); the slider (9) is movably mounted on the inner wall of the slide groove; the base (8) is fixedly mounted on the top of the slider (9); the vacuum box (4) is fixedly mounted on the top of the base (8); the reinforcing rib (6) is fixedly mounted on the top of the base (8); and the explosion-proof plate (7) is fixedly mounted on the top of the vacuum box (4); The vacuum assembly also includes a clamping assembly, which includes a clamping seat (18), a movable groove (19), a second electromagnet (20), and a spring column (21). The clamping seat (18) is fixedly mounted on the inner bottom wall of the vacuum box (4), the movable groove (19) is opened in the middle of the clamping seat (18), the second electromagnet (20) is fixedly mounted on the inner bottom wall of the movable groove (19), and the spring column (21) is fixedly mounted on the inner bottom wall of the movable groove (19).

2. The explosion-proof vacuum box for the front and rear helium detector according to claim 1, characterized in that: A threaded hole adapted to the threaded rod (28) is provided in the middle of the threaded sleeve (29), and the threaded teeth on the outer side of the threaded rod (28) are meshed with the threaded grooves, wherein the bottom of the threaded sleeve (29) is slidably connected to the inner wall of the telescopic frame (17), and the top of the threaded sleeve (29) is fixedly connected to the vacuum assembly.

3. The explosion-proof vacuum box for the front and rear helium detector according to claim 1, characterized in that: The magnetic block (13) and the electromagnet (11) are parallel to each other, and the magnetic poles on one side of the electromagnet (11) and the magnetic poles on one side of the magnetic block (13) are opposite and have the same polarity relative to each other. The other end of the positioning spring (15) is fixedly connected to the inner wall of the compression chamber (12).

4. The explosion-proof vacuum box for the front and rear helium detector according to claim 1, characterized in that: The clamping assembly further comprises a pressure block (23), a second magnetic block (22), an articulated rod group (24), a retractable articulated rod (25), and a clamping block (26); the pressure block (23) is movably mounted on the outer side of the spring column (21); the second magnetic block (22) is fixedly mounted on the middle of the pressure block (23); the retractable articulated rod (25) is movably mounted on the top of the pressure block (23); the articulated rod group (24) is movably mounted on the front side of the clamping seat (18); the articulated rod group (24) and the retractable articulated rod (25) are movably connected via a pin; and the clamping block (26) is fixedly mounted on one end of the articulated rod group (24).

5. The explosion-proof vacuum box for the front and rear helium detector according to claim 4, characterized in that: The top of the pressing block (23) is provided with an active hole adapted to the spring column (21), wherein the magnetic pole at the bottom of the second magnetic block (22) is opposite to the magnetic pole at the top of the second electromagnet (20), and the two opposite magnetic poles are parallel to each other.

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