Cap screwing device and cap screwing method

Abstract

This invention belongs to the field of capping technology, specifically relating to a capping device and method. The capping device includes a coaxially arranged drive shaft, coupling, and rotating shaft. A pre-positioning sleeve and a capping section are provided at the lower end of the rotating shaft, and a return spring is fitted around the outer periphery of the coupling. The coupling flexibly connects the rotating shaft and drive shaft, allowing the pre-positioning sleeve at the lower end of the rotating shaft to adaptively position itself relative to the filling port. The return spring can restore the bent coupling to a vertical state after the pre-positioning sleeve separates from the filling port. In other words, this capping device can adaptively compensate for any deviation between the capping section and the filling port through the pre-positioning sleeve and can automatically reset itself. Furthermore, based on a negative pressure port for cap suction at the lower end of the rotating shaft, a clamping mechanism can clamp the outer periphery of the filling port during capping and hold the cap during cap transfer, thereby improving the success rate of capping.

Description

Technical Field

[0001] This invention belongs to the field of capping technology, specifically relating to a capping device and a capping method. Background Technology

[0002] With the progress of industrialization, the volume of packaging containers used for filling liquid materials is also getting larger and larger. For example, 200L filling containers are commonly used for food packaging: for soy sauce, oil, vinegar, condiments, milk, lactic acid, etc.; beverage packaging: for wine, sake, fruit wine, mixed wine, juice, mineral water, etc.; and chemical packaging: for fine chemicals, liquid fertilizers, pesticides, treatment agents, cleaning agents, etc.

[0003] Large filling containers typically have internal threads at the filling port, which mate with a cross-shaped cap that has external threads. Existing capping devices have a low success rate when used with large filling containers. For example, if the container material is relatively soft, the bottle opening may tilt after being squeezed during the capping process, making it difficult to screw on the cap properly. Furthermore, existing capping devices require the container to be directly above the filling port for successful capping; any misalignment between the filling port and the capping head significantly reduces the success rate. Therefore, the requirement for a high filling port positioning accuracy is excessively high. Summary of the Invention

[0004] The purpose of this invention is to provide a capping device and a capping method.

[0005] This application provides a capping device. The capping device includes: a drive shaft, a coupling, and a rotating shaft arranged coaxially; wherein, a return spring is sleeved on the outer periphery of the coupling for restoring the bent coupling to a vertical state; a negative pressure port is provided at the lower end of the rotating shaft for absorbing the cap; a cap-tightening part is provided at the lower end of the rotating shaft for tightening the cap; a pre-positioning sleeve is provided on the outer periphery of the cap-tightening part for wrapping the filling port to guide the cap-tightening part to the filling port; and a clamping mechanism is provided on the outer periphery of the rotating shaft for clamping the outer periphery of the filling port when tightening the cap, or clamping the cap when transferring the cap.

[0006] In one embodiment of this application, the coupling includes several rod segments and joints connecting adjacent rod segments, and the upper and lower ends of the corrective spring are respectively fixed to the uppermost rod segment and the lowermost rod segment.

[0007] In one embodiment of this application, the upper end of the coupling is connected to the lower end of the drive shaft via a first pin, and the lower end of the coupling is connected to the upper end of the rotating shaft via a second pin; the upper and lower ends of the corrective spring abut against the first pin and the second pin, respectively.

[0008] In one embodiment of this application, a negative pressure sleeve is provided on the upper part of the rotating shaft, and an air passage communicating with the negative pressure port is provided inside. An air hole communicating with the air passage and the negative pressure chamber inside the negative pressure sleeve is provided on the side wall; an air intake hole communicating with the negative pressure chamber is provided on the side wall of the negative pressure sleeve.

[0009] In one embodiment of this application, the clamping mechanism includes: a mounting sleeve rotatably mounted on the outer periphery of a rotating shaft via a first bushing; a fixed disk fixedly connected to the outer periphery of the rotating shaft and located below the mounting sleeve; a mounting plate disposed above the fixed disk and rotatably mounted to the fixed disk; a return spring disposed between the bottom end of the mounting sleeve and the mounting plate; a plurality of gripper assemblies, all connected to the mounting sleeve and the mounting plate and arranged in an array along the outer periphery of the rotating shaft; and a pressing mechanism for driving the mounting sleeve to descend and press the return spring, thereby causing each gripper assembly to perform a clamping action.

[0010] In one embodiment of this application, the screw cap is fixed to the lower side of the fixing plate; the prepositioning sleeve is fixed on the mounting plate; and a guide bevel is provided inwardly at the bottom opening edge of the prepositioning sleeve.

[0011] In one embodiment of this application, the gripper assembly includes: a connecting rod, the upper end of which is hinged to the outer wall of the mounting sleeve; a V-shaped clamping member, the top of which is hinged to the lower end of the connecting rod, a first branch being hinged to the mounting plate, and a second branch being used to clamp the outer periphery of the filling port or the cap through a notch on the side wall of the prepositioning sleeve.

[0012] In one embodiment of this application, a guide rod parallel to the rotating shaft is installed on the bottom surface of the negative pressure sleeve; the top surface of the mounting sleeve is slidably engaged with the guide rod; the pressing mechanism includes a pressing cylinder and a pressing plate installed on the driving end of the pressing cylinder; the pressing plate is located between the bottom surface of the negative pressure sleeve and the top surface of the mounting sleeve; the pressing cylinder is adapted to drive the pressing plate to press down, thereby causing the mounting sleeve to compress the return spring.

[0013] In one embodiment of this application, the capping device further includes: a drive shaft mounting block, on which the drive shaft is rotatably mounted; a lifting plate, fixedly connected to the drive shaft mounting block and the pressing cylinder, and mounted on a lifting slide rail; and a drive mounting plate, on which a motor for driving the drive shaft to rotate and a lifting cylinder for driving the lifting plate to rise and fall are provided.

[0014] Accordingly, this application provides a capping method. The capping method includes: driving a rotating shaft to descend, with a pre-positioning sleeve at the lower end of the rotating shaft gradually contacting the filling port; a negative pressure port at the lower end of the rotating shaft sucking in the cap, a clamping mechanism clamping the outer periphery of the filling port, and the rotating shaft rotating to screw the cap on via a screwing part; and when the cap is not in the filling port and the negative pressure port sucks in the cap, the clamping mechanism clamps the cap, and a return spring drives a bent coupling to return to a vertical state.

[0015] The beneficial effects of this invention are:

[0016] Unlike existing technologies, this application provides a capping device and a capping method. The capping device includes a coaxially arranged drive shaft, coupling, and rotating shaft. A pre-positioning sleeve and a capping section are provided at the lower end of the rotating shaft, and a return spring is fitted around the outer periphery of the coupling. The coupling flexibly connects the rotating shaft and drive shaft, allowing the pre-positioning sleeve at the lower end of the rotating shaft to adaptively position itself relative to the filling port. The return spring can restore the bent coupling to a vertical state after the pre-positioning sleeve separates from the filling port. In other words, this capping device can adaptively compensate for any deviation between the capping section and the filling port through the pre-positioning sleeve and can automatically reset itself. Furthermore, based on the negative pressure port for cap suction at the lower end of the rotating shaft, a clamping mechanism can clamp the outer periphery of the filling port during capping and hold the cap during cap transfer, thereby improving the success rate of capping.

[0017] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a side view of a preferred embodiment of the capping device of the present invention;

[0021] Figure 2 This is a partial cross-sectional view of a preferred embodiment of the capping device of the present invention;

[0022] Figure 3 This is a schematic diagram of a coupling according to a preferred embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of a clamping mechanism according to a preferred embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of a gripper assembly according to a preferred embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of a filling barrel and a lid according to a preferred embodiment of the present invention.

[0026] In the picture:

[0027] 100mm cap, 110mm cap groove, 200mm filling nozzle;

[0028] Drive shaft 1, coupling 2, rod 21, joint 22, first pin 23, second pin 24, rotating shaft 3, negative pressure port 31, cap 32, pre-positioning sleeve 33, guide bevel 331, notch 332, air passage 34, air hole 35, return spring 4, clamping mechanism 5, mounting sleeve 51, first bushing 511, fixed plate 52, mounting plate 53, return spring 54, gripper assembly 55, connecting rod 551, clamping component 552, top

[0029] 5521, First branch; 5522, Second branch; 5523, Pressing mechanism; 56, Negative pressure sleeve; 6, Negative pressure chamber; 61, Suction hole; 62, Guide rod; 71, Pressing cylinder; 72, Pressing plate; 73, Drive shaft mounting block; 8, Lifting plate; 9, Lifting slide rail; 91, Drive mounting plate; 10, Motor; 101, Lifting cylinder; 102. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This application provides a capping device and a capping method, which are described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0032] To address the existing technical problems, one embodiment of this application provides a capping device. This capping device includes a drive shaft, a coupling, and a rotating shaft coaxially arranged. A pre-positioning sleeve and a capping part are provided at the lower end of the rotating shaft, and a return spring is sleeved on the outer periphery of the coupling. The coupling flexibly connects the rotating shaft and the drive shaft, allowing the pre-positioning sleeve at the lower end of the rotating shaft to adaptively position itself relative to the filling port. The return spring can restore the bent coupling to a vertical state after the pre-positioning sleeve separates from the filling port. In other words, this capping device can adaptively compensate for any deviation between the capping part and the filling port through the pre-positioning sleeve and can automatically reset itself. Furthermore, based on the negative pressure port for cap suction at the lower end of the rotating shaft, a clamping mechanism can clamp the outer periphery of the filling port during capping and clamp the cap during cap transfer, thereby improving the success rate of capping. This will be described in detail below.

[0033] See Figure 1 and Figure 2 In one embodiment, the capping device includes: a drive shaft 1, a coupling 2, and a rotating shaft 3 arranged coaxially; wherein, a return spring 4 is sleeved on the outer periphery of the coupling 2 for restoring the bent coupling 2 to a vertical state; a negative pressure port 31 is provided at the lower end of the rotating shaft 3 for absorbing the cap 100; a cap-tightening part 32 is provided at the lower end of the rotating shaft 3 for tightening the cap 100; a pre-positioning sleeve 33 is provided on the outer periphery of the cap-tightening part 32 for wrapping the filling port 200 to guide the cap-tightening part 32 to the filling port 200; and a clamping mechanism 5 is provided on the outer periphery of the rotating shaft 3 for clamping the outer periphery of the filling port 200 when tightening the cap, or clamping the cap 100 when transferring the cap 100.

[0034] For details, see Figure 2 and Figure 4 As shown, the negative pressure port 31 is located at the end of the rotating shaft 3; the screw cap part 32 is fixed to the end of the rotating shaft 3 and can rotate with the rotating shaft 3. The screw cap part 32 can be inserted into the cover groove 110 on the upper surface of the cover 100; the prepositioning sleeve 33 is located on the outer periphery of the screw cap part 32 and is coaxial with the rotating shaft 3. The prepositioning sleeve 33 can rotate relative to the rotating shaft 3 and the screw cap part 32, that is, the prepositioning sleeve 33 does not rotate with the screw cap part 32; the bottom opening edge of the prepositioning sleeve 33 is provided with a guide bevel part 331.

[0035] In an application scenario where the cap 100 needs to be unscrewed from the filling port 200, the rotating shaft 3 is driven to descend by a lifting mechanism. Through the cooperation of the guide inclined part 331 with the filling port 200, the prepositioning sleeve 33 can be guided to be coaxial with the filling port 200. At this time, the capping part 32 can be smoothly inserted into the cap groove 110 on the upper surface of the cap 100, and the negative pressure port 31 can suck up the cap 100. The clamping mechanism 5 can clamp the outer periphery of the filling port 200 for further fixation. The drive shaft 1 drives the rotating shaft 3 to rotate, which drives the capping part 32 to unscrew the cap 100 from the filling port 200. The lifting mechanism drives the rotating shaft 3 to rise, and the clamping mechanism 5 continues to clamp inward to clamp the cap 100 after it is detached from the outer periphery of the filling port 200. At this time, the negative pressure port 31 can also continue to suck up the cap 100 for transfer.

[0036] Furthermore, during the process of guiding the prepositioning sleeve 33 to be coaxial with the filling port 200, the axis of the rotating shaft 3 will deviate from the axis of the drive shaft 1. Since the drive shaft 1 and the rotating shaft 3 are connected by the coupling 2, such deviation is not allowed. After the cap is screwed on and the prepositioning sleeve 33 is disengaged from the filling port 200, the return spring 4 can drive the bent coupling 2 to return to a vertical state.

[0037] In this embodiment, only the drive shaft 1 and the rotating shaft 3 are connected by the coupling 2. The range compensation can be achieved by setting a corrective spring 4 on the outer periphery of the coupling 2, which is simple and efficient.

[0038] For details, see Figure 1 and Figure 3 In this embodiment, the coupling 2 includes several rod sections 21 and joints 22 connecting adjacent rod sections 21. The upper and lower ends of the corrective spring 4 are fixed to the uppermost rod section 21 and the lowermost rod section 21, respectively.

[0039] Furthermore, the upper end of the coupling 2 is connected to the lower end of the drive shaft 1 via the first pin 23, and the lower end of the coupling 2 is connected to the upper end of the rotating shaft 3 via the second pin 24; the upper and lower ends of the corrective spring 4 abut against the first pin 23 and the second pin 24, respectively.

[0040] In this embodiment, the two ends of the corrective spring 4 are fixed to the outermost rod 21, and its length can cover all joints 22, which can effectively correct the coupling 2.

[0041] See Figure 2 Optionally, the upper part of the rotating shaft 3 is provided with a negative pressure sleeve 6, the inside of which is provided with an air passage 34 communicating with the negative pressure port 31, and the side wall is provided with an air hole 35 communicating with the air passage 34 and the negative pressure chamber 61 inside the negative pressure sleeve 6; the side wall of the negative pressure sleeve 6 is provided with an air intake hole 62 communicating with the negative pressure chamber 61.

[0042] Specifically, the suction port 62 of the negative pressure sleeve 6 can be connected to a negative pressure source, and negative pressure can be formed at the negative pressure port 31; the negative pressure sleeve 6 can be rotatably connected to the rotating shaft 3 through several bearings; the upper and lower side walls of the negative pressure chamber 61 can cooperate with the rotating shaft 3.

[0043] See Figure 1 , Figure 2 and Figure 4 As shown, the clamping mechanism 5 includes: a mounting sleeve 51, rotatably mounted on the outer periphery of the rotating shaft 3 via a first bushing 511; a fixed disk 52, fixedly connected to the outer periphery of the rotating shaft 3 and located below the mounting sleeve 51; a mounting disk 53, disposed above the fixed disk 52 and rotatably mounted to the fixed disk 52; a return spring 54, disposed between the bottom end of the mounting sleeve 51 and the mounting disk 53; a plurality of gripper assemblies 55, all connected to the mounting sleeve 51 and the mounting disk 53, and arranged in an array along the outer periphery of the rotating shaft 3; and a pressing mechanism 56, used to drive the mounting sleeve 51 to descend and press the return spring 54, thereby driving each gripper assembly 55 to perform a clamping action.

[0044] Furthermore, the screw cap portion 32 is fixed to the lower side of the fixing plate 52; the prepositioning sleeve 33 is fixed on the mounting plate 53; and the bottom opening edge of the prepositioning sleeve 33 is provided with a guide bevel portion 331.

[0045] Specifically, the mounting sleeve 51 is rotatably mounted on the outer periphery of the rotating shaft 3 via the first bushing 511, and can move up and down relative to the rotating shaft 3 without rotating with the rotating shaft 3; when the pressing mechanism 56 drives the mounting sleeve 51 to move toward the mounting plate 53, each gripper assembly 55 will move synchronously to clamp; the mounting plate 53 can be rotatably engaged with the fixed plate 52 through the thrust bearing, so that the mounting plate 53 will not rotate with the rotating shaft 3; the return spring 54 can drive the mounting sleeve 51 to return to its original position when the pressing mechanism 56 stops applying downward pressure, so that the gripper assembly 55 will release synchronously.

[0046] See Figure 5 Optionally, the gripper assembly 55 includes: a connecting rod 551, the upper end of which is hinged to the outer wall of the mounting sleeve 51; a V-shaped clamping member 552, the top 5521 of which is hinged to the lower end of the connecting rod 551, a first branch 5522 which is hinged to the mounting plate 53, and a second branch 5523 which is used to clamp the outer periphery of the filling port 200 or the cap 100 through the notch 332 on the side wall of the prepositioning sleeve 33.

[0047] See Figure 1The bottom surface of the negative pressure sleeve 6 is equipped with a guide rod 71 parallel to the rotating shaft 3; the top surface of the mounting sleeve 51 is slidably engaged with the guide rod 71; the pressing mechanism 56 includes a pressing cylinder 72 and a pressing plate 73 installed at the driving end of the pressing cylinder 72; the pressing plate 73 is located between the bottom surface of the negative pressure sleeve 6 and the top surface of the mounting sleeve 51; the pressing cylinder 72 is adapted to drive the pressing plate 73 to press down, so as to drive the mounting sleeve 51 to compress the return spring 54.

[0048] In one application scenario, the pressing cylinder 72 presses down the mounting sleeve 51 via the pressing plate 73. The mounting sleeve 51 descends along the guide rod 71 to compress the reset spring 54, and the gripper assembly 55 retracts to perform a clamping action.

[0049] See Figure 1 Optionally, the capping device further includes: a drive shaft mounting block 8, on which the drive shaft 1 is rotatably mounted; a lifting plate 9, which is fixedly connected to the drive shaft mounting block 8 and the pressing cylinder 72, and the lifting plate 9 is mounted on a lifting slide rail 91; and a drive mounting plate 10, on which a motor 101 for driving the drive shaft 1 to rotate and a lifting cylinder 102 for driving the lifting plate 9 to rise and fall are provided.

[0050] Specifically, the motor 101 can drive the drive shaft 1 to rotate via a transmission belt or chain; the drive shaft 1 can be square or rhomboid to cooperate with a bushing and can be raised, lowered and rotated relative to the drive mounting plate 10; the drive end of the pressing cylinder 72 can be connected to the lifting plate 9 or the drive shaft mounting block 8, so as to simultaneously drive the drive shaft 1 and the lifting plate 9 to rise and fall.

[0051] In this embodiment, the capping device can be used in scenarios where the cap 100 is unscrewed from the filling port 200, or in scenarios where the cap 100 is screwed into the filling port 200.

[0052] Accordingly, in one embodiment of this application, the capping method includes: driving the rotating shaft 3 to descend, the prepositioning sleeve 33 at the lower end of the rotating shaft 3 gradually contacting the filling port 200; the negative pressure port 31 at the lower end of the rotating shaft 3 sucks up the cap 100, the clamping mechanism 5 clamps the outer periphery of the filling port 200, and the rotating shaft 3 rotates to screw the cap on through the capping part 32; and when the cap 100 is not inside the filling port 200 and the negative pressure port 31 sucks up the cap 100, the clamping mechanism 5 clamps the cap 100 and the return spring 4 drives the bent coupling 2 to return to a vertical state.

[0053] It should be noted that the capping method can be achieved using the capping device described above. For specific implementation steps, please refer to the above description, which will not be repeated here.

[0054] In summary, the capping device and capping method of this application can achieve position compensation. The compensation and reset structure is achieved by connecting only the drive shaft and the rotating shaft through a coupling. A return spring is set on the outer periphery of the coupling. The structure is simple and efficient, with a large compensation range and fast reset. The clamping action is actively achieved by a cylinder, which can be used to clamp both the filling port and the cap, ensuring the success rate of the capping process.

[0055] It should be noted that all the devices (parts whose specific structures are not specified) selected in this application are general standard parts or parts known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0056] In the description of the embodiments of the present invention, unless otherwise expressly specified and limited, the terms "installation", "connection" and "linking" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections.

[0057] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0058] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A spin-on cap device, characterized by, include: The drive shaft (1), coupling (2) and rotating shaft (3) are coaxially arranged; wherein, the outer periphery of the coupling (2) is fitted with a return spring (4) for restoring the bent coupling (2) to a vertical state; the lower end of the rotating shaft (3) is provided with a negative pressure port (31) for sucking up the cover (100). The screw cap part (32) is located at the lower end of the rotating shaft (3) and is used to screw the cap (100). A pre-positioning sleeve (33) is disposed on the outer periphery of the capping part (32) to cover the filling port (200) and guide the capping part (32) to the filling port (200); and The clamping mechanism (5) is located on the outer periphery of the rotating shaft (3) and is used to clamp the outer periphery of the filling port (200) when screwing on the cap, or to clamp the cap (100) when transferring the cap (100). The clamping mechanism (5) includes: The mounting sleeve (51) is rotatably mounted on the outer periphery of the rotating shaft (3) via the first bushing (511); The fixed plate (52) is fixedly connected to the outer periphery of the rotating shaft (3) and located on the lower side of the mounting sleeve (51); The mounting plate (53) is positioned above the fixed plate (52) and is rotatably mounted to the fixed plate (52); A return spring (54) is provided between the bottom end of the mounting sleeve (51) and the mounting plate (53); Several gripper assemblies (55) are connected to the mounting sleeve (51) and the mounting plate (53) and are arranged in an array along the outer periphery of the rotating shaft (3); and The pressing mechanism (56) is used to drive the mounting sleeve (51) to descend and squeeze the reset spring (54), so as to drive each gripper assembly (55) to perform a clamping action; The gripper assembly (55) includes: The upper end of the connecting rod (551) is hinged to the outer wall of the mounting sleeve (51); The V-shaped clamp (552) has its top (5521) hinged to the lower end of the connecting rod (551), the first branch (5522) hinged to the mounting plate (53), and the second branch (5523) used to clamp the outer periphery of the filling port (200) or the cap (100) through the notch (332) on the side wall of the prepositioning sleeve (33).

2. The capping device according to claim 1, characterized in that, The coupling (2) includes several rod sections (21) and joints (22) connecting adjacent rod sections (21). The upper and lower ends of the corrective spring (4) are fixed to the uppermost rod section (21) and the lowermost rod section (21), respectively.

3. The capping device according to claim 1, characterized in that, The upper end of the coupling (2) is connected to the lower end of the drive shaft (1) through the first pin (23), and the lower end of the coupling (2) is connected to the upper end of the rotating shaft (3) through the second pin (24). The upper and lower ends of the corrective spring (4) abut against the first pin (23) and the second pin (24), respectively.

4. The capping device according to claim 1, characterized in that, The upper part of the rotating shaft (3) is provided with a negative pressure sleeve (6), and the inside is provided with an air passage (34) that connects to the negative pressure port (31). The side wall is provided with an air hole (35) that connects the air passage (34) and the negative pressure chamber (61) inside the negative pressure sleeve (6). The side wall of the negative pressure sleeve (6) is provided with an air intake hole (62) that communicates with the negative pressure chamber (61).

5. The capping device according to claim 4, characterized in that, The screw cap (32) is fixed to the lower side of the fixed plate (52). The prepositioning sleeve (33) is fixed on the mounting plate (53). The bottom opening edge of the prepositioning sleeve (33) is provided with a guide slope (331) facing inward.

6. The capping device according to claim 4, characterized in that, The bottom surface of the negative pressure sleeve (6) is equipped with a guide rod (71) parallel to the rotating shaft (3). The top surface of the mounting sleeve (51) is in sliding fit with the guide rod (71); The pressing mechanism (56) includes a pressing cylinder (72) and a pressing plate (73) installed on the drive end of the pressing cylinder (72). The lower pressure plate (73) is located between the bottom surface of the negative pressure sleeve (6) and the top surface of the mounting sleeve (51); The pressing cylinder (72) is adapted to drive the pressing plate (73) to press down, so as to drive the mounting sleeve (51) to compress the return spring (54).

7. The capping device according to claim 6, characterized in that, The capping device further includes: Drive shaft mounting block (8), on which the drive shaft (1) is rotatably mounted; The lifting plate (9) is fixedly connected to the drive shaft mounting block (8) and the pressing cylinder (72), and the lifting plate (9) is mounted on a lifting slide rail (91); The drive mounting plate (10) is provided with a motor (101) for driving the drive shaft (1) to rotate, and a lifting cylinder (102) for driving the lifting plate (9) to lift.

8. A method of screwing a cap using the cap screwing device according to claim 1, characterized by, include: The drive shaft (3) descends, and the prepositioning sleeve (33) at the lower end of the shaft (3) gradually contacts the filling port (200). The negative pressure port (31) at the lower end of the rotating shaft (3) sucks the cap (100), the clamping mechanism (5) clamps the outer periphery of the filling port (200), and the rotating shaft (3) rotates to screw the cap through the cap screwing part (32); as well as When the cap (100) is not inside the filling port (200) and the negative pressure port (31) sucks the cap (100), the clamping mechanism (5) clamps the cap (100), and the return spring (4) drives the bent coupling (2) to return to a vertical state.

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