A capping device

Abstract

The present invention discloses a capping device, which includes a visual detection component, a rotating component, and a plurality of lid-gripping components; the rotating component includes a transmission sleeve, a first support plate, a second support plate, a support column, a bottom plate, and a driving device, and a first perspective opening is arranged along the circumference of the first support plate; the lid-gripping component includes a guide sleeve, a lifting tube, a lid-gripping head, and a servo motor, and a lifting mechanism is arranged at the upper end of the support column; the visual detection component includes a fixed column, a first mirror, a second mirror, a first camera, and a second camera, the first mirror is fixedly connected to the fixed column through a first bracket, the second mirror is fixedly connected to the fixed column through a second bracket, the first camera faces the first mirror and obtains an image directly above the first mirror through the first mirror, and the second camera faces the second mirror and obtains an image directly above the second mirror through the second mirror. The present invention is not easy to damage the cup lid and has a high installation success rate.

Description

Technical Field

[0001] The invention relates to the technical field of filling, and in particular to a capping device. Background Art

[0002] Some containers have angular appearance features. The container is divided into a cup body and a cup cover, and the cup cover is placed on the cup body. The edge of the cup mouth where the cup body and the cup cover meet is a polygonal outline, and the outline of the concave structure of the cup mouth inside the cup cover that accommodates the cup body is also a polygon. The cup cover is combined with the cup body on the premise that the outlines of the two are in a positive state, otherwise the cup mouth cannot be embedded in the cup cover.

[0003] In the prior art, in response to the technical requirements for installing a polygonal cup lid, a random pairing structure is adopted, that is, after the cup lid is pressed downward onto the cup mouth, the cup lid rotates relative to the cup body. When the outline of the cup lid and the shape of the cup mouth are aligned, the cup lid that has been pressed down will naturally combine with the cup body, that is, the cup mouth is embedded in the cup lid. Since in the existing installation technology, the rotation amount of the cup lid relative to the cup body is certain and is determined according to the maximum angle difference, there is a situation of excessive rotation. That is, when the cup lid and the cup body are facing and interlocked, there is still a tendency for the external force to drive the cup lid to rotate relative to the cup body. At this time, first, if there is sliding between the driving component and the cup lid, it will damage the cup lid. Second, if the driving component continues to drive the cup lid to rotate, there is a hidden danger that the cup lid and the cup body will separate from each other after successful assembly. Summary of the invention

[0004] In order to solve the shortcomings of the existing installation technology that the cup cover is easily damaged or the installation is easily failed, the present invention provides a cover adding device, which is not easy to damage the cup cover and has a high installation success rate.

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

[0006] A capping device, comprising a vision detection component, a rotating component, and a plurality of lid-gripping components; the rotating component includes a transmission sleeve, a first support plate, a second support plate, a support column passing through the transmission sleeve and rotatably connected to the transmission sleeve, a bottom plate fixedly connected to the lower end of the support column, and a driving device for driving the transmission sleeve to rotate around the axis of the support column. The support column passes through the transmission sleeve and is rotatably connected to the transmission sleeve. The first support plate and the second support plate are passed through by the transmission sleeve and fixedly connected to the transmission sleeve. The first support plate is arranged below the second support plate, and a first perspective opening is arranged along the circumference of the first support plate. The lid-gripping components are arranged along the circumference of the second support plate and are arranged directly above the first perspective opening; the lid-gripping component includes a guide sleeve fixedly connected to the second support plate, a lifting tube passing through the guide sleeve and slidably connected to the guide sleeve, a lid-gripping head arranged at the lower end of the lifting tube for gripping the lid, and a servo motor for rotating the lifting tube. An elevating mechanism for driving the lifting tube to move up and down is arranged at the upper end of the support column; the vision detection component includes a fixed column arranged on one side of the first support plate and fixedly connected to the bottom plate, a first mirror arranged on the lower side of the first support plate, a second mirror arranged between the lid-gripping head and the first support plate, a first camera fixedly connected to the fixed column, and a second camera fixedly connected to the fixed column. The first mirror is fixedly connected to the fixed column through a first bracket, and the second mirror is fixedly connected to the fixed column through a second bracket. The second mirror is arranged directly above the first mirror, and the first mirror is arranged directly below one of the first perspective openings. The first camera faces the first mirror and obtains an image directly above the first mirror through the first mirror. The second camera faces the second mirror and obtains an image directly above the second mirror through the second mirror.

[0007] With the above settings, when installing the lid in this application, the cup lid is not easily damaged and the installation success rate is high. Specifically, the driving device drives the transmission sleeve to rotate around the axis of the support column. The transmission sleeve drives the first support plate and the second support plate to rotate, while the support column does not rotate. The cup body is arranged along the circumference of the first support plate and rotates with the first support plate. The lid-grabbing component is used to grab the lid and is evenly arranged along the circumference of the second support plate. Each lid-grabbing component grabs a lid through the lid-grabbing head. The lids and the cup bodies on the first support plate are in one-to-one correspondence, and the lids are located directly above the cup bodies. The lids rotate with the second support plate. A first positioning mark is provided on the lower side of the lid, and a second positioning mark is provided at the bottom of the cup body. When the cup body rotates to the visual detection component, the visual detection component identifies the position of the cup mouth of the cup body through the second positioning mark, and the visual detection component identifies the position of the lid through the first positioning mark. The angle that the lid needs to rotate is calculated based on the positions of the cup mouth and the lid. Then, according to the calculation result, the servo motor drives the lid to rotate around the axis of the lifting tube through the lifting tube and the lid-grabbing head. After the lid rotates, the position of the lid matches the position of the cup mouth of the cup body. Then, the lifting mechanism drives the lid to move downward through the lifting tube and the lid-grabbing head and buckle on the cup mouth to complete the installation. After the installation is completed, the lid-grabbing head and the lid are disengaged, and then the lifting mechanism drives the lifting tube and the lid-grabbing head to move upward to prepare to grab the next lid. Specifically, when the cup body moves to the upper side of the first mirror, the first camera captures the second positioning mark at the bottom of the cup body through the first mirror and the first perspective opening, so as to identify the position of the cup body according to the second positioning mark. The second camera captures the first positioning mark on the lower side of the lid through the second mirror, so as to identify the position of the lid according to the first positioning mark. The first camera and the second camera adopt existing high-speed industrial cameras. When the cup body rotates with the first support plate and passes above the first mirror, the first camera can quickly identify without stopping the rotation of the transmission sleeve. Similarly, when the lid rotates with the second support plate and passes above the second mirror, the second camera can quickly identify without stopping the rotation of the transmission sleeve. This application first identifies the positions of the lid and the cup, then calculates the actual angle that the lid needs to rotate. After the lid rotates, the lid and the cup mouth are adapted. Finally, the lifting mechanism drives the lid to move downward and buckle on the cup mouth, which will not damage the lid, and the installation success rate is high, and the lid and the cup mouth are not easily disengaged.

[0008] Furthermore, the visual detection component further includes a first light source arranged between the first mirror and the first perspective opening, and a second light source arranged between the lid-grabbing head and the second mirror. The first light source is annular and forms a second perspective opening, and the second light source is annular and forms a third perspective opening. The first light source is fixedly connected to the fixed column through a third bracket, and the second light source is fixedly connected to the fixed column through a fourth bracket.

[0009] Further, the lifting mechanism includes a top plate fixedly connected to the upper end of the support column, and a driving ring fixedly connected to the lower side of the top plate. The driving ring and the support column are coaxial. A guiding groove is provided along the outer periphery of the driving ring. The upper end of the lifting tube is sleeved with a connecting seat. One side of the connecting seat is rotatably connected with a guiding wheel. The connecting seat and the lifting tube are rotatably connected. The servo motor is arranged on the connecting seat and connected to the lifting tube. The guiding wheel is arranged in the guiding groove. The guiding groove includes a detection groove section and a gland groove section. The height where the detection groove section is located is higher than the height where the gland groove section is located. The guiding wheel of the lid grasping component at the visual detection component is located in the detection groove section.

[0010] Further, an air passage is formed in the lifting tube. The lid grasping head includes a limiting sleeve with an opening downward, and a suction cup arranged in the limiting sleeve. The suction cup is communicated with the lower end of the air passage.

[0011] Further, a connection port is arranged on one side of the connecting seat close to the support column. An annular groove communicated with the connection port is arranged inside the connecting seat. The annular groove surrounds the lifting tube. The upper end of the air passage is communicated with the annular groove.

[0012] Further, an ear plate is fixedly connected to one side of the connecting seat. A guiding rod passes through the ear plate. The guiding rod is parallel to the lifting tube. The guiding rod is slidably connected to the ear plate. The lower end of the guiding rod is fixedly connected to the second support plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of an embodiment.

[0014] Figure 2 It is Figure 1 an enlarged view of part A of

[0015] Figure 3 It is a schematic diagram of the visual detection component.

[0016] Figure 4 It is a sectional view of the embodiment.

[0017] Figure 5 It is Figure 4 an enlarged view of part B of

[0018] Figure 6 It is Figure 5 an enlarged view of part C of

[0019] Figure 7 It is Figure 5 an enlarged view of part D of DETAILED DESCRIPTION OF THE INVENTION

[0020] Next, through embodiments and in conjunction with the drawings, the technical solutions of the present invention will be further specifically described.

[0021] See Figures 1 to 7, A capping device, comprising a vision detection component 11, a rotating component 12, and a plurality of lid-grabbing components 13; the rotating component 12 includes a transmission sleeve 121, a first support plate 122, a second support plate 123, a support column 124 passing through the transmission sleeve 121 and rotatably connected to the transmission sleeve 121, a bottom plate 125 fixedly connected to the lower end of the support column 124, and a driving device for driving the transmission sleeve 121 to rotate around the axis of the support column 124. The support column 124 passes through the transmission sleeve 121 and is rotatably connected to the transmission sleeve 121. The first support plate 122 and the second support plate 123 are passed through by the transmission sleeve 121 and fixedly connected to the transmission sleeve 121. The first support plate 122 is arranged below the second support plate 123, and a first perspective opening 1221 is arranged along the circumference of the first support plate 122. The lid-grabbing components 13 are arranged along the circumference of the second support plate 123 and are arranged directly above the first perspective opening 1221; the lid-grabbing component 13 includes a guide sleeve 131 fixedly connected to the second support plate 123, a lifting tube 132 passing through the guide sleeve 131 and slidably connected to the guide sleeve 131, a lid-grabbing head 133 arranged at the lower end of the lifting tube 132 for grabbing the lid 21, and a servo motor 134 for rotating the lifting tube 132. An elevating mechanism 127 for driving the lifting tube 132 to move up and down is arranged at the upper end of the support column 124; the vision detection component 11 includes a fixed column 111 arranged on one side of the first support plate 122 and fixedly connected to the bottom plate 125, a first mirror 112 arranged on the lower side of the first support plate 122, a second mirror 113 arranged between the lid-grabbing head 133 and the first support plate 122, a first camera 114 fixedly connected to the fixed column 111, and a second camera 115 fixedly connected to the fixed column 111. The first mirror 112 is fixedly connected to the fixed column 111 through a first bracket 1121, the second mirror 113 is fixedly connected to the fixed column 111 through a second bracket 1131. The second mirror 113 is arranged directly above the first mirror 112, and the first mirror 112 is arranged directly below one of the first perspective openings 1221. The first camera 114 faces the first mirror 112 and obtains an image directly above the first mirror 112 through the first mirror 112, and the second camera 115 faces the second mirror 113 and obtains an image directly above the second mirror 113 through the second mirror 113.

[0022] With the above settings, when installing the lid 21 in this application, the cup lid is not easily damaged and the installation success rate is high. Specifically, refer to Figure 1 and Figure 2, the driving device drives the transmission sleeve 121 to rotate around the axis of the support column 124. The transmission sleeve 121 drives the first support plate 122 and the second support plate 123 to rotate, while the support column 124 does not rotate. The cup body 22 is arranged along the circumference of the first support plate 122 and rotates with the first support plate 122. The lid grasping member 13 is used to grasp the lid 21 and is evenly arranged along the circumference of the second support plate 123. Each lid grasping member 13 grasps a lid 21 through the lid grasping head 133. The lids 21 and the cup bodies 22 on the first support plate 122 are in one-to-one correspondence, and the lids 21 are located directly above the cup bodies 22. For the simplicity of the drawings in the specification, only one lid grasping member 13 is retained in the drawings of the specification. The lid 21 rotates with the second support plate 123. For the cup body 22 and the lid 21, reference can be made to the design patent CN307178339S. A first positioning mark 211 is provided on the lower side of the lid 21, and a second positioning mark 221 is provided at the bottom of the cup body 22. When the cup body 22 rotates to the visual inspection component 11, refer to Figures 3 to 7, the visual detection component 11 identifies the position of the cup mouth of the cup body 22 through the second positioning mark 221, and the visual detection component 11 identifies the position of the lid 21 through the first positioning mark 211. The angle that the lid 21 needs to rotate is calculated based on the position of the cup mouth and the position of the lid 21. Then, the servo motor 134 drives the lid 21 to rotate around the axis of the lifting tube 132 through the lifting tube 132 and the lid gripper 133 according to the calculation result. After the lid 21 rotates, the position of the lid 21 matches the position of the cup mouth of the cup body 22. Then, the lifting mechanism 127 drives the lid 21 to move downward through the lifting tube 132 and the lid gripper 133 and buckle it on the cup mouth to complete the installation. After the installation is completed, the lid gripper 133 and the lid 21 are disengaged, and then the lifting mechanism 127 drives the lifting tube 132 and the lid gripper 133 to move upward to prepare to grab the next lid 21. Specifically, when the cup body 22 moves to the upper side of the first mirror 112, the first camera 114 captures the second positioning mark 221 at the bottom of the cup body 22 through the first mirror 112 and the first perspective port 1221, so as to identify the position of the cup body 22 according to the second positioning mark 221. The second camera 115 captures the first positioning mark 211 at the lower side of the lid 21 through the second mirror 113, so as to identify the position of the lid 21 according to the first positioning mark 211. The first camera 114 and the second camera 115 adopt existing high-speed industrial cameras. When the cup body 22 rotates with the first support plate 122 and passes above the first mirror 112, the first camera 114 can quickly identify it without stopping the rotation of the transmission sleeve 121. Similarly, when the lid 21 rotates with the second support plate 123 and passes above the second mirror 113, the second camera 115 can quickly identify it without stopping the rotation of the transmission sleeve 121. In this application, the positions of the lid 21 and the cup are first identified, then the actual rotation angle that the lid 21 needs to rotate is calculated. After the lid 21 rotates, the lid 21 and the cup mouth are adapted. Finally, the lifting mechanism drives the lid 21 to move downward and buckle it on the cup mouth, which will not damage the lid 21, and the installation success rate is high, and the lid 21 and the cup mouth are not easily disengaged.

[0023] As an implementation method, the visual detection component 11 further includes a first light source 116 arranged between the first mirror 112 and the first perspective port 1221, and a second light source 117 arranged between the lid gripper 133 and the second mirror 113. The first light source 116 is annular and forms a second perspective port 1161, and the second light source 117 is annular and forms a third perspective port 1171. The first light source 116 is fixedly connected to the fixed column 111 through the third bracket 1162, and the second light source 117 is fixedly connected to the fixed column 111 through the fourth bracket 1172.

[0024] With the above settings, the first light source 116 increases the brightness at the bottom of the cup body 22, thus facilitating the shooting by the first camera 114. The first light source 116 is annular, so that the periphery of the bottom of the cup body 22 can be illuminated, and the brightness is more uniform. On the other hand, the first light source 116 forms a second perspective opening 1161, which facilitates the first camera 114 to shoot the second positioning mark 221 at the bottom of the cup body 22 through the first perspective opening 1221 and the second perspective opening 1161. In addition, the second light source 117 increases the brightness on the lower side of the lid 21, thus facilitating the shooting by the second camera 115. The second light source 117 is annular, so that the lower side of the lid 21 can be evenly illuminated. On the other hand, the second light source 117 forms a third perspective opening 1171, which facilitates the second camera 115 to shoot the first positioning mark 211 on the lower side of the lid 21 through the third perspective opening 1171.

[0025] As an implementation, the lifting mechanism 127 includes a top plate 1271 fixedly connected to the upper end of the support column 124 and a driving ring 1272 fixedly connected to the lower side of the top plate 1271. The driving ring 1272 and the support column 124 are coaxial. A guide groove 1273 is provided along the outer periphery of the driving ring 1272. The upper end of the lifting pipe 132 is sleeved with a connecting seat 1321. A guide wheel 1322 is rotatably connected to one side of the connecting seat 1321. The connecting seat 1321 and the lifting pipe 132 are rotatably connected. The servo motor 134 is arranged on the connecting seat 1321 and connected to the lifting pipe 132. The guide wheel 1322 is arranged in the guide groove 1273. The guide groove 1273 includes a detection groove section 12731 and a gland groove section 12732. The height of the detection groove section 12731 is higher than the height of the gland groove section 12732. The guide wheel 1322 of the lid-grabbing component 13 at the visual detection component 11 is located in the detection groove section 12731.

[0026] With the above settings, the support column 124 is fixedly connected through the top plate 1271 and the driving ring 1272. When the grasping cover member 13 rotates around the support column 124 with the second support plate 123, the guide wheel 1322 moves along the guide groove 1273. Specifically, during the movement of the guide wheel 1322 along the guide groove 1273, the guide wheel 1322 undulates up and down according to the shape of the guide groove 1273. When the guide wheel 1322 moves upward, the guide wheel 1322 drives the grasping cover head 133 to move upward through the connecting seat 1321 and the lifting pipe 132. When the guide wheel 1322 moves downward, the guide wheel 1322 drives the cover 21 to move downward through the connecting seat 1321, the lifting pipe 132, and the grasping cover head 133, and buckles the cover 21 on the cup mouth. Specifically, when the guide wheel 1322 moves to the detection groove section 12731, the cover 21 is located directly above the cup body 22 and is recognized by the second camera 115. After recognition, the cover 21 rotates and is ready for installation. When the guide wheel 1322 moves from the detection groove section 12731 to the capping groove section 12732, the guide wheel 1322 moves downward and makes the cover 21 buckle on the cup mouth to complete the installation. As the transmission sleeve 121 continues to rotate, the guide wheel 1322 moves back to the detection groove section 12731 again. The guide wheel 1322 moves upward and drives the grasping cover head 133 to move upward, so that the grasping cover head 133 leaves the cover 21, and then grabs a new cover 21 and prepares for the next round of installation.

[0027] As an implementation method, an air passage 1323 is formed in the lifting pipe 132. The grasping cover head 133 includes a limiting sleeve 1331 with an opening downward and a suction cup 1332 arranged in the limiting sleeve 1331. The suction cup 1332 is communicated with the lower end of the air passage 1323.

[0028] With the above settings, the upper end of the air passage 1323 is connected to a negative pressure device. The negative pressure device extracts the gas in the suction cup 1332 through the air passage, thereby adsorbing the cover 21 on the lower side of the suction cup 1332. After the installation of the cover 21 is completed, the negative pressure device restores the pressure in the suction cup 1332, and the pressure difference inside and outside the suction cup 1332 disappears, so that the adsorption force on the cover 21 is lost. When the grasping cover head 133 moves upward, the suction cup 1332 and the cover 21 are disengaged.

[0029] As an implementation method, a connection port 1324 is arranged on one side of the connecting seat 1321 close to the support column 124. An annular groove 1325 communicated with the connection port 1324 is arranged inside the connecting seat 1321. The annular groove 1325 is arranged around the lifting pipe 132, and the upper end of the air passage 1323 is communicated with the annular groove 1325.

[0030] With the above settings, the connection port 1324 is connected to the negative pressure device. When the servo motor 134 drives the grasping cover head 133 to rotate through the lifting pipe 132, the air passage 1323 is always in communication with the annular groove 1325, so that the connection port 1324 is always in communication with the air passage 1323. That is, during the rotation of the lifting pipe 132, the negative pressure device is always in communication with the suction cup 1332.

[0031] As an implementation manner, one side of the connection seat 1321 is fixedly connected with an ear plate 1326. A guide rod 1327 passes through the ear plate 1326. The guide rod 1327 is parallel to the lifting pipe 132. The guide rod 1327 is slidably connected with the ear plate 1326. The lower end of the guide rod 1327 is fixedly connected with the second support plate 123.

[0032] With the above settings, when the connection seat 1321 moves up and down following the guide wheel 1322, the ear plate 1326 moves along the guide rod 1327, and the guide rod 1327 prevents the lifting pipe 132 from driving the rotation of the connection seat 1321 during the rotation process.

[0033] It should be understood that for those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present invention.

Claims

1. A capping device, characterized in that, It includes a visual detection component, a rotating component, and several lid-grabbing components; The rotating component includes a transmission sleeve, a first support plate, a second support plate, a support column passing through the transmission sleeve and rotatably connected to the transmission sleeve, a bottom plate fixedly connected to the lower end of the support column, and a driving device for driving the transmission sleeve to rotate around the axis of the support column. The support column passes through the transmission sleeve and is rotatably connected to the transmission sleeve. The first support plate and the second support plate are passed through by the transmission sleeve and fixedly connected to the transmission sleeve. The first support plate is arranged below the second support plate, and a first perspective opening is arranged along the circumference of the first support plate. The lid-grabbing components are arranged along the circumference of the second support plate and are arranged directly above the first perspective opening; The lid-grabbing component includes a guide sleeve fixedly connected to the second support plate, a lifting tube passing through the guide sleeve and slidably connected to the guide sleeve, a lid-grabbing head arranged at the lower end of the lifting tube for grabbing the lid, and a servo motor for rotating the lifting tube. The upper end of the support column is provided with a lifting mechanism for driving the lifting tube to move up and down; The visual detection component includes a fixed column arranged on one side of the first support plate and fixedly connected to the bottom plate, a first mirror arranged on the lower side of the first support plate, a second mirror arranged between the lid-grabbing head and the first support plate, a first camera fixedly connected to the fixed column, and a second camera fixedly connected to the fixed column. The first mirror is fixedly connected to the fixed column through a first bracket, and the second mirror is fixedly connected to the fixed column through a second bracket. The second mirror is arranged directly above the first mirror, and the first mirror is arranged directly below one of the first perspective openings. The first camera faces the first mirror and obtains an image directly above the first mirror through the first mirror. The second camera faces the second mirror and obtains an image directly above the second mirror through the second mirror; A first positioning mark is arranged on the lower side of the lid, and a second positioning mark is arranged at the bottom of the cup body. When the cup body rotates to the visual detection component, the visual detection component identifies the position of the cup mouth of the cup body through the second positioning mark, and the visual detection component identifies the position of the lid through the first positioning mark. The angle that the lid needs to rotate is calculated based on the position of the cup mouth and the position of the lid. Then, the servo motor drives the lid to rotate around the axis of the lifting tube through the lifting tube and the lid-grabbing head according to the calculation result. After the lid rotates, the position of the lid matches the position of the cup mouth of the cup body. Then, the lifting mechanism drives the lid to move downward through the lifting tube and the lid-grabbing head and buckle on the cup mouth to complete the installation.

2. The capping device according to claim 1, characterized in that, The visual detection component further includes a first light source arranged between the first mirror and the first perspective opening, and a second light source arranged between the lid-grabbing head and the second mirror. The first light source is annular and forms a second perspective opening. The second light source is annular and forms a third perspective opening. The first light source is fixedly connected to the fixed column through a third bracket, and the second light source is fixedly connected to the fixed column through a fourth bracket.

3. The capping device according to claim 1, characterized in that, The lifting mechanism includes a top plate fixedly connected to the upper end of the support column, and a driving ring fixedly connected to the lower side of the top plate. The driving ring and the support column are coaxial. A guiding groove is provided along the outer periphery of the driving ring. The upper end of the lifting tube is sleeved with a connecting seat. One side of the connecting seat is rotatably connected with a guiding wheel. The connecting seat and the lifting tube are rotatably connected. The servo motor is arranged on the connecting seat and connected to the lifting tube. The guiding wheel is arranged in the guiding groove. The guiding groove includes a detection groove section and a gland groove section. The height of the detection groove section is higher than that of the gland groove section. The guiding wheel of the gripper cover component at the visual detection component is located in the detection groove section.

4. A capping device according to claim 3, wherein An air passage is formed in the lifting tube. The gripper head includes a limiting sleeve with an opening downward and a suction cup arranged in the limiting sleeve. The suction cup is communicated with the lower end of the air passage.

5. The capping device according to claim 4, characterized in that, A connection port is arranged on one side of the connecting seat close to the support column. An annular groove communicated with the connection port is arranged inside the connecting seat. The annular groove surrounds the lifting tube. The upper end of the air passage is communicated with the annular groove.

6. The capping device according to claim 4, characterized in that, An ear plate is fixedly connected to one side of the connecting seat. A guiding rod passes through the ear plate. The guiding rod is parallel to the lifting tube. The guiding rod is slidably connected with the ear plate. The lower end of the guiding rod is fixedly connected to the second support plate.

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