Air tightness detection capping device for split type plastic bottle cap

Abstract

The invention provides a split type plastic bottle cap air tightness detection capping device which comprises a box body, a bottom cap feeding disc, a discharging disc and a top cap feeding disc are fixedly installed in the box body, a detection disc and a capping disc which rotate intermittently are further installed in the box body, the bottom cap feeding disc, the top cap feeding disc and the capping disc are each provided with a material distribution disc which rotates intermittently, and the bottom cap feeding disc, the top cap feeding disc and the capping disc are each provided with a material distribution disc which rotates intermittently. Limiting openings are formed in the circumferential side walls of the material distribution disc, a first discharging opening allowing a bottom cover to fall onto the detection disc is formed in the bottom of the rear side of the bottom cover feeding disc, a plurality of lower detection bases are fixedly installed on the disc face of the detection disc in the circumferential direction, and lower detection grooves used for detecting the air tightness of the lower half portion of the bottom cover are formed in the lower detection bases. And the middle part of the detection disc is fixedly connected with a mounting column. The device can realize a continuous bottle cap airtightness detection process, can complete an automatic cap pressing process after detection, can independently carry out airtightness detection on a bottom cap opening and a pull ring part of a bottom cap, and is comprehensive in detection.

Description

Technical Field

[0001] The invention relates to the technical field of bottle cap detection, and in particular to an airtightness detection and capping device for a split type plastic bottle cap. Background Art

[0002] Plastic bottle caps are a common packaging form for bottles, cans, and barrels, and are particularly widely used in the beverage, chemical, and pharmaceutical fields. Among them, the bottle caps of soy sauce bottles, vinegar bottles, and liquor bottles are generally divided into two forms, one-piece and two-piece plastic bottle caps. The two-piece bottle caps generally include a bottom cover and a top cover. A sealing pull ring is provided inside the bottom cover. After the bottom cover and the top cover are formed, the sealing of the bottom cover needs to be tested. The current testing methods are mostly carried out in groups, that is, multiple bottle caps are manually placed in the testing tank, and gas is pumped into the tank for testing. After the test is completed, the next group of bottle caps needs to be replaced, and a continuous testing process cannot be achieved. In addition, the bottom cover is not fully tested, and it is easy to miss the test. Summary of the invention

[0003] In view of the above problems, the present invention provides an airtightness detection and capping device for a split plastic bottle cap, which can realize a continuous bottle cap airtightness detection process, and can also complete an automated capping process after the detection, and can perform airtightness detection on the bottom cover opening and the pull ring part of the bottom cap separately, so as to perform comprehensive detection.

[0004] To solve the above problems, the technical solution adopted by the present invention is:

[0005] A split-type plastic bottle cap airtightness detection and capping device comprises a box body, on which a bottom cover loading tray, a lower loading tray and a top cover loading tray are fixedly installed, and an intermittently rotating detection tray and a capping tray are also installed, and the bottom cover loading tray, the top cover loading tray and the capping tray are all installed with intermittently rotating distribution trays, and the circumferential side walls of the distribution trays are all provided with limiting openings, and the bottom of the rear side of the bottom cover loading tray is provided with a first discharge opening for the bottom cover to fall into the detection tray, and a plurality of lower detection seats are fixedly installed circumferentially on the disk surface of the detection tray, and the lower detection seats are provided with A lower inspection groove for detecting the air tightness of the lower half of the bottom cover, a mounting column is fixedly connected to the middle of the inspection disk, and upper inspection columns corresponding to the lower inspection seats are installed on the circumferential side walls of the mounting columns, and the bottom of the upper inspection columns is provided with an upper inspection groove for detecting the air tightness of the upper half of the bottom cover, and a lifting component that can drive the corresponding upper inspection column to move downward is also installed on the side walls of the mounting columns, and a plurality of liftable top cover suction heads are installed on the circumferential bottom of the pressure cover disk, and the top cover suction heads are used to absorb the top cover on the top cover upper material tray and press it onto the bottom cover on the lower material tray.

[0006] Preferably, a bottom cover feeding channel extending into the box is fixedly installed on the left side of the box body, and the extended end of the bottom cover feeding channel is connected to the bottom cover upper material tray. A top cover feeding channel extending into the box is fixedly installed on the right side of the box body, and the extended end of the top cover feeding channel is connected to the top cover upper material tray.

[0007] Preferably, the three material distribution plates, detection plate and cover pressing plate are all driven by corresponding drive shafts, the material distribution plates on the bottom cover upper plate and the top cover upper plate and the cover pressing plate all rotate counterclockwise, and the material distribution plates on the detection plate and the lower material plate all rotate clockwise.

[0008] Preferably, a second discharge port is provided at the front bottom of the discharge tray, a discharge belt conveyor is installed in the box body, the feeding end of the discharge belt conveyor is located below the second discharge port, and the discharge end of the discharge belt conveyor extends out of the box body and is installed with a material removal air duct.

[0009] Preferably, the lifting assembly includes a first electric push rod fixedly mounted on the side wall of the mounting column, the telescopic end of the first electric push rod is fixedly connected to a connecting arm, the end of the connecting arm is fixedly connected to the top of the corresponding upper detection column, and multiple first electric push rods are externally connected to a controller.

[0010] Preferably, an air cavity is provided in the upper detection column, and a piston is provided in the air cavity. A second electric push rod is fixedly installed on the top of the upper detection column, and the telescopic end of the second electric push rod extends into the air cavity and is fixedly connected to the piston. The piston divides the air cavity into an upper air chamber and a lower air chamber. The upper air chamber is used to inject air into the downward detection groove, and the lower air chamber is used to inject air into the upward detection groove. The second electric push rod is connected to an external controller.

[0011] Preferably, the top of the upper air chamber is connected to an upper air intake pipe and an upper air outlet pipe, the end of the upper air outlet pipe extends into the lower detection seat and is connected to the bottom of the lower detection slot, the bottom of the lower air chamber is connected to a lower air intake pipe and a lower air outlet pipe, the end of the lower air outlet pipe is connected to the top of the upper detection slot, and one-way valves are installed in the upper air intake pipe, upper air outlet pipe, lower air intake pipe and lower air outlet pipe.

[0012] Preferably, air pressure sensors are embedded in the top of the upper air chamber and the bottom of the lower air chamber.

[0013] Preferably, a sealing gasket is installed on the inner bottom of the lower detection groove, and a sealing ring is installed on the inner wall of the groove opening of the upper detection groove.

[0014] Preferably, a plurality of third electric push rods are fixedly installed on the circumference of the pressure cover plate, the telescopic ends of the third electric push rods are fixedly connected to the corresponding top cover suction heads, the third electric push rods are externally connected to the controller, and an air suction main pipe passing through the corresponding drive shaft is fixedly installed at the center of the pressure cover plate, an air suction branch pipe is provided in the top cover suction head, the end of the air suction branch pipe is connected to the air suction main pipe, and an electromagnetic valve is installed in the air suction branch pipe, and the upper end of the air suction main pipe is connected to a negative pressure pipe through a rotating joint.

[0015] The beneficial effects of the present invention are:

[0016] 1. By installing the bottom cover loading tray, the detection tray, the top cover loading tray, the unloading tray and the capping tray, the bottom cover slides from the bottom cover feeding channel to the bottom cover loading tray, and the limit opening of the dividing tray cooperates with the tray edge of the bottom cover loading tray to realize the one-by-one transfer process of the bottom covers, and the bottom covers fall onto the detection tray one by one through the first unloading port, and are transferred to the unloading tray after completing the air tightness test. At the same time, the top cover slides onto the top cover loading tray through the top cover feeding channel, and is transferred by the dividing tray. The top cover is grabbed by the capping tray and pressed onto the corresponding bottom cover on the unloading tray to complete the capping process. After capping, it falls onto the discharging belt conveyor through the second unloading port and is sent out, and the rejecting air duct completes the removal of unqualified products, thereby realizing a continuous bottle cap air tightness test process, and can also complete the automatic capping process after the test, with high efficiency.

[0017] 2. By installing the lower detection seat, the upper detection column and the lifting assembly, the bottom covers fall into the lower detection groove of the lower detection seat one by one, and the corresponding first electric push rod is started. The upper detection column is driven downward by the connecting arm to press the bottom cover completely into the lower detection groove. The bottom cover is in conflict with the sealing gasket, and the top of the bottom cover is inserted into the upper detection groove. The cover wall is sealed by the sealing ring, and the second electric push rod is started to drive the piston upward first to pump the air in the upper air chamber of the air cavity into the lower detection groove through the upper air outlet pipe. The piston moves up to the preset position, and the air pressure value is measured by the top air pressure sensor. If there is a defect or air leakage in the bottom cover space of the bottom cover, the air pressure value decreases, and it is judged that there is a defect. If there is no defect, the piston moves downward, and the gas in the lower air chamber is squeezed into the upper detection groove through the lower air outlet pipe. If there is a defect or air leakage in the sealing pull ring of the bottom cover, the air pressure value measured by the bottom air pressure sensor decreases, and it is judged that there is a defect. The air tightness detection process is completed and the detection is comprehensive.

[0018] 3. By installing the top cover suction head, start the third electric push rod at the corresponding position to drive the corresponding top cover suction head to move down and cover the corresponding top cover. At this time, open the solenoid valve at the corresponding position to connect the suction branch pipe with the suction main pipe. Suction through the negative pressure pipe to generate negative pressure, which can adsorb and grab the top cover. The capping plate rotates to move the top cover to the position of the bottom cover on the unloading plate. The third electric push rod is used to drive the top cover to move down again and press it on the bottom cover. Then the solenoid valve is closed, the negative pressure disappears, the top cover is released, and the capping assembly process is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 A schematic side cross-sectional view of the detection disk proposed by the present invention;

[0021] Figure 3 A schematic side cross-sectional view of the gland plate provided by the present invention;

[0022] Figure 4 It is a detection state diagram of the lower detection tank of the present invention;

[0023] Figure 5 This is a detection state diagram of the upper detection slot of the present invention.

[0024] In the figure: 1 box body, 2 loading tray, 3 detection tray, 4 bottom cover feeding channel, 5 unloading tray, 6 cover pressing tray, 7 top cover loading tray, 8 top cover feeding channel, 9 distribution tray, 10 limit port, 11 first unloading port, 12 second unloading port, 13 unloading belt conveyor, 14 lower detection seat, 15 mounting column, 16 first electric push rod, 17 second electric push rod, 18 connecting arm, 19 upper air outlet pipe, 20 upper detection column, 21 upper detection groove, 22 sealing ring, 23 lower suction pipe, 24 lower air outlet pipe, 25 upper suction pipe, 26 piston, 27 air cavity, 28 air pressure sensor, 29 sealing pad, 30 lower detection groove, 31 negative pressure pipe, 32 driving shaft, 33 third electric push rod, 34 suction branch pipe, 35 solenoid valve, 36 top cover suction head, 37 material removal air duct. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0027] Reference Figure 1-5A split-type airtightness detection and capping device for plastic bottle caps comprises a box body 1, in which a bottom cover loading tray 2, a lower loading tray 5 and a top cover loading tray 7 are fixedly installed, and an intermittently rotating detection tray 3 and a capping tray 6 are also installed. The bottom cover loading tray 2, the top cover loading tray 7 and the capping tray 6 are all equipped with an intermittently rotating distribution tray 9, and the circumferential side walls of the distribution tray 9 are all provided with limiting openings 10. The bottom of the rear side of the bottom cover loading tray 2 is provided with a first lowering opening 11 for the bottom cover to fall into the detection tray 3. The three distribution trays 9, the detection tray 3 and the capping tray 6 are all driven by corresponding drive shafts 32. The upper material tray 2, the dividing plate 9 on the top cover upper material tray 7 and the pressing plate 6 all rotate counterclockwise, and the dividing plate 9 on the detection plate 3 and the lower material tray 5 all rotate clockwise. The limit opening 10 of the dividing plate 9 cooperates with the edge of the bottom cover upper material tray 2 to realize the one-by-one transfer process of the bottom covers. The bottom covers fall onto the detection tray 3 one by one through the first discharge opening 11, and are transferred to the lower material tray 5 after completing the airtightness test. At the same time, the top cover slides onto the top cover upper material tray 7 through the top cover feeding channel 8, and is divided and transferred by the dividing plate 9. The top cover is grabbed by the pressing plate 6 and pressed into the corresponding bottom cover on the lower material tray 5.

[0028] Furthermore, a bottom cover feeding channel 4 extending into the box is fixedly installed on the left side of the box body 1, and the extended end of the bottom cover feeding channel 4 is connected with the bottom cover upper material tray 2. A top cover feeding channel 8 extending into the box is fixedly installed on the right side of the box body 1, and the extended end of the top cover feeding channel 8 is connected with the top cover upper material tray 7. The bottom cover slides from the bottom cover feeding channel 4 to the bottom cover upper material tray 2, and the top cover slides from the top cover feeding channel 8 to the top cover upper material tray 7.

[0029] Furthermore, a second discharge port 12 is provided at the front bottom of the discharge tray 5, and a discharge belt conveyor 13 is installed in the box body 1. The feeding end of the discharge belt conveyor 13 is located below the second discharge port 12, and the discharge end of the discharge belt conveyor 13 extends out of the box body 1 and is installed with a rejection air duct 37. After the capping, the product falls onto the discharge belt conveyor 13 through the second discharge port 12 and is sent out by the rejection air duct 37. Unqualified products are rejected.

[0030] A plurality of lower detection seats 14 are fixedly installed circumferentially on the surface of the detection disk 3, and a lower detection groove 30 for detecting the air tightness of the lower half of the bottom cover is provided on the lower detection seat 14. A mounting column 15 is fixedly connected to the middle of the detection disk 3, and upper detection columns 20 corresponding to the lower detection seats 14 are installed on the circumferential side walls of the mounting column 15. An upper detection groove 21 for detecting the air tightness of the upper half of the bottom cover is provided at the bottom of the upper detection column 20, a sealing gasket 29 is installed on the inner bottom of the lower detection groove 30, and a sealing ring 22 is installed on the inner wall of the groove of the upper detection groove 21.

[0031] An air cavity 27 is provided in the upper detection column 20, and a piston 26 is provided in the air cavity 27. A second electric push rod 17 is fixedly installed on the top of the upper detection column 20. The telescopic end of the second electric push rod 17 extends into the air cavity 27 and is fixedly connected to the piston 26. The piston 26 divides the air cavity 27 into an upper air chamber and a lower air chamber. The upper air chamber is used to inject air into the lower detection groove 30, and the lower air chamber is used to inject air into the upper detection groove 21. The second electric push rod 17 is externally connected to a controller. The top of the upper air chamber is connected to an upper air intake pipe 25 and an upper air outlet pipe 19. The end of the air outlet pipe 19 extends into the lower detection seat 14 and is connected to the bottom of the lower detection groove 30. The bottom of the lower air chamber is connected with a lower air intake pipe 23 and a lower air outlet pipe 24. The end of the lower air outlet pipe 24 is connected to the top of the upper detection groove 21. The upper air intake pipe 25, the upper air outlet pipe 19, the lower air intake pipe 23 and the lower air outlet pipe 24 are all installed with a one-way valve. The top of the upper air chamber and the bottom of the lower air chamber are embedded with air pressure sensors 28, which can perform air tightness detection on the bottom cover and the pull ring part of the bottom cover separately, and the detection is comprehensive.

[0032] The side wall of the mounting column 15 is also provided with a lifting assembly that can drive the corresponding upper detection column 20 to move downward. The lifting assembly includes a first electric push rod 16 fixedly installed on the side wall of the mounting column 15. The telescopic end of the first electric push rod 16 is fixedly connected to a connecting arm 18. The end of the connecting arm 18 is fixedly connected to the top of the corresponding upper detection column 20. Multiple first electric push rods 16 are externally connected to a controller. When the corresponding first electric push rod 16 is started, the upper detection column 20 is driven to move downward through the connecting arm 18, and the bottom cover is completely pressed into the lower detection groove 30. The airtightness detection process can be carried out, and the bottle cap can also be placed on the discharge tray 5 after the detection.

[0033] A plurality of liftable top cover suction heads 36 are installed at the circumferential bottom of the cover pressing plate 6. The top cover suction heads 36 are used to absorb the top cover on the top cover upper material tray 7 and press it onto the bottom cover on the lower material tray 5. A plurality of third electric push rods 33 are fixedly installed on the circumference of the cover pressing plate 6. The telescopic ends of the third electric push rods 33 are fixedly connected to the corresponding top cover suction heads 36. The third electric push rods 33 are externally connected to a controller. An air suction main pipe penetrating the corresponding drive shaft 32 is fixedly installed at the center of the cover pressing plate 6. An air suction branch pipe 34 is arranged in the top cover suction head 36. The end of the air suction branch pipe 34 is connected to the air suction main pipe, and a The solenoid valve 35 and the upper end of the air suction main pipe are connected to the negative pressure pipe 31 through a rotating joint. The third electric push rod 33 at the corresponding position is started to drive the corresponding top cover suction head 36 to move downward to cover the corresponding top cover. At this time, the solenoid valve 35 at the corresponding position is opened to connect the air suction branch pipe 34 with the air suction main pipe. The negative pressure is generated by suction through the negative pressure pipe 31, so that the top cover can be adsorbed and grasped. The pressing plate 6 rotates to turn the top cover to the position of the bottom cover corresponding to the unloading plate 5, and the top cover is driven downward by the third electric push rod 33 again to press it on the bottom cover. Then the solenoid valve 35 is closed, the negative pressure disappears, and the top cover is released to complete the pressing assembly process.

[0034] The bottom cover slides from the bottom cover feeding channel 4 to the bottom cover upper material tray 2, and the limit opening 10 of the distribution tray 9 cooperates with the plate edge of the bottom cover upper material tray 2 to realize the one-by-one transfer process of the bottom covers. The bottom covers fall onto the detection tray 3 one by one through the first discharge opening 11. Since the detection tray 3 and the distribution tray 9 are adapted to the rotation speed, the bottom cover can fall into the corresponding lower detection groove 30 of the lower detection seat 14, and the corresponding first electric push rod 16 is started, and the upper detection column 20 is driven downward through the connecting arm 18 to completely press the bottom cover into the lower detection groove 30. The bottom cover mouth contacts the sealing gasket 29, and the top of the bottom cover is inserted into the upper detection groove 21. The cover wall is sealed by the sealing ring 22 , start the second electric push rod 17, first drive the piston 26 to move up, and pump the air in the upper air chamber of the air cavity 27 into the lower detection groove 30 through the upper air outlet pipe 19. The piston 26 moves up to a preset position, and the air pressure value is measured by the top air pressure sensor 28. If there is a defect and air leakage in the bottom cover space of the bottom cover, the air pressure value decreases, and it is judged that there is a defect. If there is no defect, the piston 26 moves down, and the gas in the lower air chamber is squeezed into the upper detection groove 21 through the lower air outlet pipe 24. If there is a defect and air leakage in the sealing pull ring of the bottom cover, the air pressure value measured by the bottom air pressure sensor 28 decreases, and it is judged that there is a defect, and the air tightness detection process is completed.

[0035] After the detection is completed, since the sealing ring 22 contacts the side wall of the bottom cover, the upper detection column 20 moves up and the bottom cover moves out of the lower detection seat 14, and the piston 26 moves down again to pump air into the upper detection groove 21, so that the bottom cover can be pushed out of the upper detection groove 21 and fall onto the lower material tray 5. At the same time, the top cover slides through the top cover feeding channel 8 to the top cover loading tray 7, and is transported by the material distribution tray 9. The third electric push rod 33 at the corresponding position is started to drive the corresponding top cover suction head 36 to move down and cover the corresponding top cover. At this time, the solenoid valve 35 at the corresponding position is opened to allow the suction branch pipe 36 to be opened. 34 is connected to the air suction main pipe, and negative pressure is generated by suction through the negative pressure pipe 31, so that the top cover can be adsorbed and grabbed, and the capping plate 6 rotates to turn the top cover to the position of the bottom cover corresponding to the unloading plate 5, and the top cover is driven down by the third electric push rod 33 again to press it on the bottom cover, and then the solenoid valve 35 is closed, the negative pressure disappears, and the top cover is released to complete the capping assembly process. After capping, it falls on the discharging belt conveyor 13 through the second unloading port 12 and is sent out. The rejecting air duct 37 completes the rejection of unqualified products, realizing a continuous bottle cap air tightness detection process, and can also complete the automatic capping process after the detection.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A split-type plastic bottle cap airtightness detection and capping device, comprising a box body (1), characterized in that: The box body (1) is fixedly installed with a bottom cover loading tray (2), a lower loading tray (5) and a top cover loading tray (7), and is also installed with an intermittently rotating detection tray (3) and a cover pressing tray (6). The bottom cover loading tray (2), the top cover loading tray (7) and the cover pressing tray (6) are all installed with an intermittently rotating distribution tray (9), and the circumferential side walls of the distribution tray (9) are all provided with limiting openings (10). The rear bottom of the bottom cover loading tray (2) is provided with a first discharge opening (11) for the bottom cover to fall onto the detection tray (3). A plurality of lower detection seats (14) are fixedly installed circumferentially on the disk surface of the detection tray (3), and the lower detection seats (14) are provided with a device for detecting the airtightness of the lower half of the bottom cover. The detection plate (3) is provided with a mounting column (15) fixedly connected to the middle of the detection plate (3); the circumferential side wall of the mounting column (15) is provided with an upper detection column (20) corresponding to the lower detection seat (14); the bottom of the upper detection column (20) is provided with an upper detection groove (21) for detecting the air tightness of the upper half of the bottom cover; the side wall of the mounting column (15) is also provided with a lifting component that can drive the corresponding upper detection column (20) to move downward; the circumferential bottom of the pressure plate (6) is provided with a plurality of liftable top cover suction heads (36); the top cover suction heads (36) are used to absorb the top cover on the top cover upper material plate (7) and press it onto the bottom cover on the lower material plate (5).

2. The airtightness detection and capping device for a split type plastic bottle cap according to claim 1, characterized in that: A bottom cover material feeding channel (4) extending into the box is fixedly mounted on the left side of the box body (1), and an extended end of the bottom cover material feeding channel (4) is communicated with a bottom cover material loading tray (2). A top cover material feeding channel (8) extending into the box is fixedly mounted on the right side of the box body (1), and an extended end of the top cover material feeding channel (8) is communicated with a top cover material loading tray (7).

3. The airtightness detection and capping device for a split type plastic bottle cap according to claim 1, characterized in that: The three material distribution plates (9), the detection plate (3) and the cover plate (6) are all driven by corresponding drive shafts (32); the material distribution plates (9) and the cover plate (6) on the bottom cover upper plate (2) and the top cover upper plate (7) all rotate counterclockwise, and the material distribution plates (9) on the detection plate (3) and the lower plate (5) all rotate clockwise.

4. The airtightness detection and capping device for a split type plastic bottle cap according to claim 1, characterized in that: A second discharge port (12) is provided at the front bottom of the discharge tray (5), and a discharge belt conveyor (13) is installed in the box body (1). The feeding end of the discharge belt conveyor (13) is located below the second discharge port (12), and the discharge end of the discharge belt conveyor (13) extends out of the box body (1) and is installed with a material removal air duct (37).

5. The airtightness detection and capping device for a split type plastic bottle cap according to claim 1, characterized in that: The lifting assembly comprises a first electric push rod (16) fixedly mounted on the side wall of the mounting column (15); the telescopic end of the first electric push rod (16) is fixedly connected to a connecting arm (18); the end of the connecting arm (18) is fixedly connected to the top of the corresponding upper detection column (20); and a plurality of the first electric push rods (16) are externally connected to a controller.

6. The airtightness detection and capping device for a split type plastic bottle cap according to claim 1, characterized in that: An air cavity (27) is provided in the upper detection column (20), and a piston (26) is provided in the air cavity (27). A second electric push rod (17) is fixedly installed on the top of the upper detection column (20). The telescopic end of the second electric push rod (17) extends into the air cavity (27) and is fixedly connected to the piston (26). The piston (26) divides the air cavity (27) into an upper air chamber and a lower air chamber. The upper air chamber is used to inject air into the lower detection groove (30), and the lower air chamber is used to inject air into the upper detection groove (21). The second electric push rod (17) is externally connected to a controller.

7. The airtightness detection and capping device for a split type plastic bottle cap according to claim 6, characterized in that: The top of the upper air chamber is connected to an upper air intake pipe (25) and an upper air outlet pipe (19), the end of the upper air outlet pipe (19) extends into the lower detection seat (14) and is communicated with the bottom of the lower detection tank (30), the bottom of the lower air chamber is connected to a lower air intake pipe (23) and a lower air outlet pipe (24), the end of the lower air outlet pipe (24) is communicated with the top of the upper detection tank (21), and one-way valves are installed in the upper air intake pipe (25), the upper air outlet pipe (19), the lower air intake pipe (23) and the lower air outlet pipe (24).

8. The airtightness detection and capping device for a split type plastic bottle cap according to claim 7, characterized in that: The top of the upper air chamber and the bottom of the lower air chamber are both embedded with air pressure sensors (28).

9. The air tightness detection and capping device for a split type plastic bottle cap according to claim 1, characterized in that: A sealing pad (29) is installed on the inner bottom of the lower detection groove (30), and a sealing ring (22) is installed on the inner wall of the groove opening of the upper detection groove (21).

10. The air tightness detection and capping device for a split type plastic bottle cap according to claim 1, characterized in that: A plurality of third electric push rods (33) are fixedly installed on the circumference of the cover plate (6), the telescopic ends of the third electric push rods (33) are fixedly connected to the corresponding top cover suction heads (36), the third electric push rods (33) are externally connected to a controller, an air suction main pipe penetrating the corresponding drive shaft (32) is fixedly installed at the center of the cover plate (6), an air suction branch pipe (34) is arranged in the top cover suction head (36), the end of the air suction branch pipe (34) is connected to the air suction main pipe, and an electromagnetic valve (35) is installed in the air suction branch pipe (34), and the upper end of the air suction main pipe is connected to a negative pressure pipe (31) via a rotary joint.

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