An airtightness testing device for quality inspection of container thread ends

Abstract

The present invention discloses an airtightness detection device for quality inspection of threaded openings of containers, including a transparent sleeve, a motor, a screw, a cylinder, a screwing claw, a rubber ring gasket, a suction pipe, a cylinder, an arm, an inlet and outlet pipe, an electromagnet and a circular plate. The benefits of the present invention are: a single motor can be used to conveniently and efficiently complete the loading, unloading and replacement required for threaded opening matching cover inspection, and the number of drive actuators installed is small, which helps to improve the overall lightweight of the inspection equipment; the top surface of the limiting convex ring block and the rubber ring gasket are tightly squeezed and sealed with each other, and the convex tubular threaded opening part of the container to be inspected is fixed, which is conducive to forming a detection part connected to the threaded opening of a container in a sealed space, eliminating the interference of the external air environment on the airtightness detection; the method of immersing the threaded opening matching cover part in liquid and combining it with the method of pumping air to form an air pressure difference is conducive to the inspection personnel to more visually judge the airtightness result, and the effect is remarkable.

Description

Technical Field

[0001] The invention relates to the field of airtightness detection equipment, in particular to an airtightness detection equipment used for quality inspection of threaded openings of containers. Background Art

[0002] At present, containers are generally made of plastic, such as plastic bottles and other containers. In the manufacturing process of plastic containers, in order to better configure the corresponding sealing cover, a convex tubular threaded opening is usually reserved at the port of the container. Once there is a manufacturing defect in the thread structure of this threaded opening, it will cause the container to leak.

[0003] However, most of the existing airtightness detection equipment blocks the container port for airtightness detection, and only detects whether there are micropores and other leaks inside the container. It is not suitable for airtightness detection of the threaded openings on the container. There are the following technical difficulties in detecting the threaded openings on the outside of the container: 1. The sealing effect of the threaded opening is poor and is greatly affected by the external environment; 2. The number of times the threaded opening is loaded and unloaded and the cover is replaced is high, making detection difficult; 3. The clamping fixed position is not suitable for traditional clamps. Therefore, in response to the above problems, an airtightness detection device for quality inspection of container threaded openings is proposed. Summary of the invention

[0004] The purpose of the present invention is to provide an airtightness detection device for quality inspection of container threaded openings in order to solve the above-mentioned problem.

[0005] The present invention achieves the above-mentioned purpose through the following technical scheme: an airtight detection device for quality inspection of container threaded openings, comprising a transparent sleeve, a motor, a screw, a cylinder, a metal short cylinder, a first ring block, a screwing claw, a second ring block, a rubber ring gasket, a suction pipe, a cylinder, an arm, an inlet and outlet pipe, an electromagnet and a circular plate, wherein the middle part of the transparent sleeve is rotatably connected with the first ring block through a bearing, and the sealing ring located at the inner ring wall of the first ring block is in sliding sealing contact with the surface of the cylinder, the tooth surface section located at the lower side of the middle part of the cylinder is meshed and connected with the circular arc tooth surface located at the top of the screwing claw, each of the screwing claws is rotatably connected with the corresponding U-shaped part at the bottom of the first ring block, a screw is threadedly connected in the screw hole located in the middle of the top of the cylinder, one end of the guide block is slidably installed in each guide groove distributed on the upper side of the middle part of the cylinder, the metal short cylinder is located between two support plates, and an electromagnet is installed on one side of the bottom end of each support plate;

[0006] Each connecting groove located at the bottom end port of the transparent sleeve is rotatably connected to the middle part of the corresponding arm rod through a rotating shaft, a top pressure arc rod is welded at one end of the arm rod, and the other end of the arm rod is rotatably connected to a movable connecting seat located at the output end of the cylinder, and a plurality of distributed top pressure arc rods and a rubber ring gasket located at the bottom of the second ring block form a sealing clamping structure, the second ring block is sealingly installed in the bottom end port of the transparent sleeve, and the space between the second ring block and the first ring block is connected with a suction pipe part and an inlet and outlet pipe part.

[0007] Preferably, the guide block is L-shaped, and the other end of the guide block is vertically fixed at a corresponding position on the top of the first ring block.

[0008] Preferably, the inner side of the top end of the screw is rotatably mounted in the middle of the circular plate, and the top end face of the screw is connected to the motor located on the circular plate, the screw passes through the circular hole located at the top of the metal short cylinder, and the bottom end port of the metal short cylinder is fixedly connected to the corresponding part of the first ring block through distributed connecting columns.

[0009] Preferably, the circular plate is sealed and installed in the top end port of the transparent sleeve, and the bottom surface of the circular plate is fixedly connected to the top end of the corresponding support plate.

[0010] Preferably, the inner ring hole diameter of the second ring block is larger than the diameter of the convex tubular threaded opening on the container to be inspected, and the inner ring hole diameter of the second ring block is smaller than the diameter of the limiting convex ring block at the end of the bottle mouth of the container to be inspected.

[0011] Preferably, the limiting convex ring block is clamped and fixed between the rubber ring gasket and the top-pressing arc rod.

[0012] Preferably, a top cover suction cup is rotatably mounted on the middle portion of the bottom end surface of the cylinder, and the top cover suction cup contacts the top surface of the threaded port matching cover by moving.

[0013] Preferably, the communication port between the suction pipe and the transparent sleeve is located at the inner wall of the transparent sleeve below the bearing.

[0014] Preferably, a port at one end of the inlet and outlet pipe is in communication with the annular surface at the top of the second ring block, and an electric control valve is installed on the external pipe body of the inlet and outlet pipe.

[0015] Preferably, the cylinder body portion of the cylinder is fixedly mounted on the surface of the transparent sleeve.

[0016] The beneficial effects of the present invention are:

[0017] 1. A single motor can be used to conveniently and efficiently complete the installation and replacement of the threaded port matching cover, which reduces the number of installed and used drive actuators and helps to improve the overall lightweight of the testing equipment;

[0018] Second, the top surface of the limiting convex ring block and the rubber ring gasket are tightly squeezed and sealed with each other, which has the structural function of fixing the convex tubular threaded opening of the container to be inspected, changing the clamping position, reducing the degree of damage to the tooling, and combining the circular plate, bearing, first ring block, second ring block and cylindrical part, which is conducive to forming a container threaded opening connected to the detection part placed in a sealed space, eliminating the interference of the external air environment on the airtight detection;

[0019] 3. The method of immersing the threaded port and matching the cover with liquid and combining it with vacuuming to form an air pressure difference can help inspectors to judge the airtightness results more visible to the naked eye, with low testing costs and significant effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the distributed connection structure between the screw, the cylinder and the screwing claws of the present invention;

[0023] Figure 3 A cross-sectional view of the distributed connection structure between the screw, the cylinder and the screwing claws of the present invention;

[0024] Figure 4 It is a schematic diagram of the connection structure between the cylinder and the arm of the present invention;

[0025] Figure 5 It is a schematic diagram of the connection structure of the top-pressing arc rod of the present invention.

[0026] In the figure: 1. transparent sleeve; 110. connecting groove; 2. motor; 3. screw; 4. cylinder; 410. guide groove; 420. tooth surface section; 430. top cover suction cup; 440. screw hole; 5. guide block; 6. bearing; 7. metal short cylinder; 710. round hole; 720. connecting column; 8. first ring block; 810. sealing ring; 9. screw claw; 910. arc tooth surface; 10. U-shaped part; 11. second ring block; 12. rubber ring gasket; 13. suction pipe; 14. cylinder; 15. movable connecting seat; 16. arm; 1610. rotating shaft; 1620. top pressure arc rod; 17. water inlet and outlet pipe; 18. electric control valve; 19. electromagnet; 20. support plate; 21. round plate; 22. container to be inspected; 2210. limit convex ring block; 2220. threaded matching cover. DETAILED DESCRIPTION

[0027] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below 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.

[0028] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0029] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] See also Figure 1-5 As shown, an airtightness detection device for quality inspection of container threaded openings includes a transparent sleeve 1, a motor 2, a screw 3, a cylinder 4, a metal short cylinder 7, a first ring block 8, a screw claw 9, a second ring block 11, a rubber ring gasket 12, a suction pipe 13, a cylinder 14, an arm 16, an inlet and outlet pipe 17, an electromagnet 19 and a circular plate 21. The middle part of the transparent sleeve 1 is rotatably connected to the first ring block 8 through a bearing 6, and a sealing ring 810 located at the inner ring wall of the first ring block 8 is in sliding sealing contact with the surface of the cylinder 4, and a tooth surface segment 420 located at the lower side of the middle part of the cylinder 4 is in contact with a circular arc tooth segment 420 located at the top of the screw claw 9. The surface 910 is meshed and connected, each of the screwing claws 9 is rotatably connected to the U-shaped piece 10 corresponding to the bottom of the first ring block 8, the screw hole 440 located in the middle of the top of the cylinder 4 is threadedly connected with the screw rod 3, the middle of the bottom end surface of the cylinder 4 is rotatably installed with a top cover suction cup 430, and the top cover suction cup 430 is in contact with the top surface of the threaded port matching cover 2220 through movement, and one end of the guide block 5 is slidably installed in each guide groove 410 distributed on the upper side of the middle of the cylinder 4, and the guide block 5 is L-shaped, and the other end of the guide block 5 is vertically fixed at the corresponding position on the top of the first ring block 8;

[0031] Combination Figure 2 and Figure 3As shown, the operation of the motor 2 drives the screw 3 to rotate and enter the first execution stage: the screw 3 rotates in the screw hole 440 located at the top of the cylinder 4, and cooperates with the guide groove 410 located on the annular surface of the cylinder 4 to slide and connect with one end of the guide block 5 located on the first ring block 8, which plays the role of rotation restriction and up and down movement guidance. At the same time, the electromagnet 19 located on the support plate 20 magnetically fixes the metal short cylinder 7, so as to achieve the effect of driving the cylinder 4 to move down or up;

[0032] Under the meshing connection between the tooth surface segment 420 on the cylinder 4 and the circular arc tooth surface 910 located at the top of each screwing claw 9, when the cylinder 4 moves upward, the tooth surface segment 420 is driven to move upward, so that the bottom end of the screwing claw 9 connected by the circular arc tooth surface 910 moves inward until it contacts the annular surface of the threaded port matching cover 2220, thereby clamping and fixing the threaded port matching cover 2220;

[0033] When the cylinder 4 moves downward, the tooth surface segment 420 is driven to move downward, so that the bottom end of the screwing claw 9 connected via the arc tooth surface 910 is separated from the annular surface of the threaded port matching cover 2220, thereby releasing the clamping and fixing of the threaded port matching cover 2220.

[0034] Combination Figure 1 As shown, the metal short cylinder 7 is located between two support plates 20, and an electromagnet 19 is installed on one side of the bottom end of each support plate 20, the inner side of the top end of the screw rod 3 is rotatably installed in the middle of the circular plate 21, and the top end face of the screw rod 3 is connected to the motor 2 located on the circular plate 21, the screw rod 3 passes through the circular hole 710 located at the top of the metal short cylinder 7, and the bottom end of the metal short cylinder 7 is fixedly connected to the corresponding part of the first ring block 8 through the distributed connecting columns 720;

[0035] After the first execution stage is completed, the motor 2 drives the screw 3 to rotate and enter the second execution stage: when the cylinder 4 moves up to the critical point and does not move, the electromagnet 19 is powered off, releasing the magnetic attraction fixation of the metal short cylinder 7. At this time, the screw 3 rotates to drive the connected cylinder 4 and the threaded matching cover 2220 clamped and fixed by the screwing claw 9 to rotate, playing the role of screwing the threaded matching cover 2220 onto the threaded opening of the container 22 to be inspected;

[0036] According to the first execution stage action and the second execution stage action mentioned above, a single motor can conveniently and efficiently complete the loading, unloading and replacement required for the threaded port matching cover detection, reducing the number of installed and used overall drive actuators, which helps to improve the overall lightweight of the detection equipment.

[0037] Combination Figure 1 , Figure 4 and Figure 5As shown, each connection groove 110 located at the bottom end of the transparent sleeve 1 is rotatably connected to the middle of the corresponding arm 16 through a rotating shaft 1610, a top-pressing arc rod 1620 is welded at one end of the arm 16, and the other end of the arm 16 is rotatably connected to the movable connection seat 15 located at the output end of the cylinder 14, and the distributed multiple top-pressing arc rods 1620 and the rubber ring gasket 12 located at the bottom of the second ring block 11 form a sealing clamping structure;

[0038] After the threaded mouth matching cover 2220 is clamped and fixed by the screwing claw 9, the convex tubular threaded mouth part of the container 22 to be inspected passes through the second ring block 11, and at the same time, the limiting convex ring block 2210 located at the bottom of the threaded bottle mouth part contacts with the rubber ring pad 12 located at the bottom of the second ring block 11. At this time, the cylinder 14 is in an extended state, so that the arm 16 connected by the movable connecting seat 15 is in a side rotation state, and the top pressing arc rod 1620 located at one end of the arm 16 is further moved up to the limiting convex ring block The bottom surface of 2210 is in contact with the top pressure, and the top surface of the limiting convex ring block 2210 and the rubber ring gasket 12 are tightly squeezed and sealed with each other, which has the structural function of fixing the convex tubular threaded mouth part of the container 22 to be inspected, changing the clamping position, reducing the degree of damage to the tooling, and combining the circular plate 21, the bearing 6, the first ring block 8, the second ring block 11 and the cylindrical part 4, which is conducive to forming a container The detection part connected to the threaded mouth is placed in a sealed space, eliminating the interference of the external air environment on the airtight detection.

[0039] The second ring block 11 is sealed and installed in the bottom end port of the transparent sleeve 1, and the space between the second ring block 11 and the first ring block 8 is connected with the suction pipe 13 and the water inlet and outlet pipe 17. The limiting convex ring block 2210 is clamped and fixed between the rubber ring gasket 12 and the top pressure arc rod 1620.

[0040] When the cap is screwed on and the airtightness test is started, the outer ends of the water inlet and outlet pipes 17 are connected to the external water supply pump and the water pump, and the outer ends of the suction pipes 13 are connected to the external vacuum pump. The specific airtightness test steps are as follows:

[0041] In the first step, the water inlet and outlet pipe 17 injects water into the formed sealed space under the action of the external water supply pump, and the electric control valve 18 is opened first and then closed after the water injection is completed, and the water submerges the threaded port matching cover 2220, leaving a quarter of the sealed space;

[0042] The second step is to operate the external vacuum pump to exhaust the air above the liquid surface in the sealed space through the suction pipe 13, and combine with the transparent sleeve 1 made of transparent material. If a series of bubbles appear, the larger the bubbles, the worse the sealing, indicating that the airtightness is unqualified; if no bubbles appear, it means that the airtightness is qualified;

[0043] Step 3: The electric control valve 18 is opened, and the external water pump connected to the water inlet and outlet pipe 17 is combined to drain the water in the sealed space;

[0044] Step 4: Complete the airtightness test, release the clamping fixation of the connected part of the container 22 to be inspected, and take out the packaged bottle;

[0045] In summary, the method of immersing the threaded port and matching the cover with liquid and combining it with vacuuming to form an air pressure difference can help inspectors to judge the airtightness results more visible to the naked eye, and the inspection cost is low and the effect is significant.

[0046] like Figure 1 As shown, the circular plate 21 is sealed and installed in the top port of the transparent sleeve 1, and the bottom surface of the circular plate 21 is fixedly connected to the top of the corresponding support plate 20. The circular plate 21 is used to seal the top space in the transparent sleeve 1, and at the same time support and install the motor 2. The support plate 20 connected to the circular plate 21 plays the role of hoisting and fixing the electromagnet 19.

[0047] like Figure 1 As shown, the inner ring hole diameter of the second ring block 11 is larger than the diameter of the convex tubular threaded opening on the container to be inspected 22, and the inner ring hole diameter of the second ring block 11 is smaller than the diameter of the limiting convex ring block 2210 located at the end of the bottle mouth of the container to be inspected 22, ensuring unobstructed loading and unloading operations of the threaded opening matching cover 2220.

[0048] The communication port between the suction pipe 13 and the transparent sleeve 1 is located at the inner wall of the transparent sleeve 1 below the bearing 6, so that a vacuum pump externally connected to the suction pipe 13 can exhaust the space above the liquid level in the sealed space.

[0049] One end of the water inlet and outlet pipe 17 is connected to the annular surface at the top of the second ring block 11 , and an electric control valve 18 is installed on the outer pipe body of the water inlet and outlet pipe 17 to achieve the effect of controlling the opening and closing of the water inlet and outlet pipe 17 .

[0050] like Figure 1 As shown, the cylinder body of the cylinder 14 is fixedly mounted on the surface of the transparent sleeve 1 to achieve the function of fixing the cylinder 14 .

[0051] Working principle: Combination Figure 2 and Figure 3 As shown, the operation of the motor 2 drives the screw 3 to rotate and enter the first execution stage: the screw 3 rotates in the screw hole 440 located at the top of the cylinder 4, and cooperates with the guide groove 410 located on the annular surface of the cylinder 4 to slide and connect with one end of the guide block 5 located on the first ring block 8, which plays the role of rotation restriction and up and down movement guidance. At the same time, the electromagnet 19 located on the support plate 20 magnetically fixes the metal short cylinder 7, so as to achieve the effect of driving the cylinder 4 to move down or up;

[0052] Under the meshing connection between the tooth surface segment 420 on the cylinder 4 and the circular arc tooth surface 910 located at the top of each screwing claw 9, when the cylinder 4 moves upward, the tooth surface segment 420 is driven to move upward, so that the bottom end of the screwing claw 9 connected by the circular arc tooth surface 910 moves inward until it contacts the annular surface of the threaded port matching cover 2220, thereby clamping and fixing the threaded port matching cover 2220;

[0053] When the cylinder 4 moves downward, the tooth surface segment 420 is driven to move downward, so that the bottom end of the screwing claw 9 connected via the arc tooth surface 910 is separated from the annular surface of the threaded port matching cover 2220, thereby releasing the clamping and fixing of the threaded port matching cover 2220.

[0054] After the first execution stage is completed, the motor 2 drives the screw 3 to rotate and enter the second execution stage: when the cylinder 4 moves up to the critical point and does not move, the electromagnet 19 is powered off, releasing the magnetic attraction fixation of the metal short cylinder 7. At this time, the screw 3 rotates to drive the connected cylinder 4 and the threaded matching cover 2220 clamped and fixed by the screwing claw 9 to rotate, playing the role of screwing the threaded matching cover 2220 onto the threaded opening of the container 22 to be inspected;

[0055] According to the first execution stage action and the second execution stage action, a single motor can conveniently and efficiently complete the installation and replacement of the threaded port matching cover detection, reducing the number of installed and used overall drive actuators, which helps to improve the overall lightweight of the detection equipment;

[0056] After the threaded mouth matching cover 2220 is clamped and fixed by the screwing claw 9, the convex tubular threaded mouth part of the container 22 to be inspected passes through the second ring block 11, and at the same time, the limiting convex ring block 2210 located at the bottom of the threaded bottle mouth part contacts with the rubber ring pad 12 located at the bottom of the second ring block 11. At this time, the cylinder 14 is in an extended state, so that the arm 16 connected by the movable connecting seat 15 is in a side rotation state, and the top pressing arc rod 1620 located at one end of the arm 16 is further moved up to the limiting convex ring block The bottom surface of 2210 is contacted and pressed, and the top surface of the limiting convex ring block 2210 and the rubber ring gasket 12 are tightly squeezed and sealed with each other, which has the structural function of fixing the convex tubular threaded opening part of the container 22 to be inspected, changing the clamping position, reducing the degree of damage to the tooling, and combining the circular plate 21, the bearing 6, the first ring block 8, the second ring block 11 and the cylindrical part 4, which is conducive to forming a container threaded opening connected to the detection part placed in a sealed space, eliminating the interference of the external air environment on the airtight detection;

[0057] When the cap is screwed on and the airtightness test is started, the outer ends of the water inlet and outlet pipes 17 are connected to the external water supply pump and the water pump, and the outer ends of the suction pipes 13 are connected to the external vacuum pump. The specific airtightness test steps are as follows:

[0058] In the first step, the water inlet and outlet pipe 17 injects water into the formed sealed space under the action of the external water supply pump, and the electric control valve 18 is opened first and then closed after the water injection is completed, and the water submerges the threaded port matching cover 2220, leaving a quarter of the sealed space;

[0059] The second step is to operate the external vacuum pump to exhaust the air above the liquid surface in the sealed space through the suction pipe 13, and combine with the transparent sleeve 1 made of transparent material. If a series of bubbles appear, the larger the bubbles, the worse the sealing, indicating that the airtightness is unqualified; if no bubbles appear, it means that the airtightness is qualified;

[0060] Step 3: The electric control valve 18 is opened, and the external water pump connected to the water inlet and outlet pipe 17 is combined to drain the water in the sealed space;

[0061] Step 4: Complete the airtightness test, release the clamping fixation of the connected part of the container 22 to be inspected, and take out the packaged bottle;

[0062] In summary, the method of immersing the threaded port and matching the cover with liquid and combining it with vacuuming to form an air pressure difference can help inspectors to judge the airtightness results more visible to the naked eye, and the inspection cost is low and the effect is significant.

[0063] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0064] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An airtightness detection device for quality inspection of container thread ends, characterized in that: The invention comprises a transparent sleeve (1), a motor (2), a screw (3), a cylinder (4), a metal short cylinder (7), a first ring block (8), a screw claw (9), a second ring block (11), a rubber ring gasket (12), a suction pipe (13), a cylinder (14), an arm (16), an inlet and outlet pipe (17), an electromagnet (19) and a circular plate (21), wherein the middle part of the transparent sleeve (1) is rotatably connected to the first ring block (8) via a bearing (6), and a sealing ring (810) located on the inner ring wall of the first ring block (8) is in sliding sealing contact with the surface of the cylinder (4), and is located in the middle part of the cylinder (4). The tooth surface segment (420) on the lower side is meshedly connected with the arc tooth surface (910) located at the top of the screwing claw (9), each of the screwing claws (9) is rotatably connected to the corresponding U-shaped member (10) located at the bottom of the first ring block (8), a screw rod (3) is threadedly connected to the screw hole (440) located in the middle of the top of the cylinder (4), one end of the guide block (5) is slidably installed in each guide groove (410) distributed on the upper side of the middle of the cylinder (4), the metal short cylinder (7) is located between the two support plates (20), and an electromagnet (19) is installed on one side of the bottom end of each support plate (20); Each connection groove (110) located at the bottom end of the transparent sleeve (1) is rotatably connected to the middle of the corresponding arm (16) via a rotating shaft (1610); a top-pressure arc rod (1620) is welded to one end of the arm (16); and the other end of the arm (16) is rotatably connected to a movable connection seat (15) located at the output end of the cylinder (14); a plurality of distributed top-pressure arc rods (1620) and a rubber ring gasket (12) located at the bottom of the second ring block (11) form a sealed clamping structure; the second ring block (11) is sealedly installed in the bottom end of the transparent sleeve (1), and the space between the second ring block (11) and the first ring block (8) is connected to a suction pipe (13) portion and an inlet and outlet pipe (17) portion; The inner side of the top end of the screw rod (3) is rotatably mounted in the middle of the circular plate (21), and the top end face of the screw rod (3) is connected to the motor (2) located on the circular plate (21); the screw rod (3) passes through the circular hole (710) located at the top of the metal short cylinder (7), and the bottom end port of the metal short cylinder (7) is fixedly connected to the corresponding part of the first ring block (8) through the distributed connecting columns (720); The diameter of the inner ring hole of the second ring block (11) is larger than the diameter of the convex tubular threaded opening on the container to be inspected (22), and the diameter of the inner ring hole of the second ring block (11) is smaller than the diameter of the limiting convex ring block (2210) located at the end of the bottle mouth of the container to be inspected (22). The limiting convex ring block (2210) is clamped and fixed between the rubber ring gasket (12) and the top-pressing arc rod (1620). The threaded opening matching cover (2220) is screwed onto the threaded opening of the container to be inspected (22). The circular plate (21), the bearing (6), the first ring block (8), the second ring block (11) and the cylindrical portion (4) are combined to form a detection portion connected to the container threaded opening and placed in a sealed space.

2. The airtightness detection device for container thread quality inspection according to claim 1, characterized in that: The guide block (5) is L-shaped, and the other end of the guide block (5) is vertically fixed at a corresponding position on the top of the first ring block (8).

3. The airtightness detection device for container thread quality inspection according to claim 1, characterized in that: The circular plate (21) is sealingly mounted in the top end port of the transparent sleeve (1), and the bottom surface of the circular plate (21) is fixedly connected to the top end of the corresponding support plate (20).

4. The airtightness detection device for container thread quality inspection according to claim 1, characterized in that: A top cover suction cup (430) is rotatably mounted in the middle of the bottom end surface of the cylinder (4), and the top cover suction cup (430) contacts the top surface of the threaded port matching cover (2220) by moving.

5. The airtightness detection device for container thread quality inspection according to claim 1, characterized in that: The communication port between the suction pipe (13) and the transparent sleeve (1) is located on the inner wall of the transparent sleeve (1) below the bearing (6).

6. The airtightness detection device for container thread quality inspection according to claim 1, characterized in that: One end port of the water inlet and outlet pipe (17) is in communication with the annular surface at the top of the second ring block (11), and an electric control valve (18) is installed on the outer pipe body of the water inlet and outlet pipe (17).

7. The airtightness detection device for quality inspection of container thread ends according to claim 1, characterized in that: The cylinder body portion of the cylinder (14) is fixedly mounted on the surface of the transparent sleeve (1).

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