A capping system

Abstract

The utility model embodiment discloses a capping system, comprising: a capping mechanism and a pneumatic control mechanism connected to the capping mechanism; the capping mechanism comprises a first cylinder, a second cylinder, a positioning sleeve, and a capping head; the pneumatic control mechanism comprises an air source, a first pneumatic control assembly, and a second pneumatic control assembly, when the first cylinder drives the positioning sleeve to move in a direction away from the barrel cover, the first pneumatic control assembly and the second pneumatic control assembly work simultaneously to provide the first cylinder with gas of a first preset pressure, when the first cylinder drives the positioning sleeve to move in a direction close to the barrel cover, the second pneumatic control assembly works to provide the first cylinder with gas of a second preset pressure, and the first preset pressure is greater than the second preset pressure. Through the utility model embodiment, the capping system provided by the present application can be applied to the capping of packaging barrels of different types and different barrel heights and has lower cost.

Description

Technical Field

[0001] The present application relates to the technical field of capping machines, and in particular to a capping system. Background Art

[0002] In the field of chemical production, commonly used packaging barrels are divided into two categories: iron barrels and plastic barrels. Due to the different processing standards of iron barrels and plastic barrels, the barrel heights vary greatly. In addition, even if the packaging barrels are of the same type, there will be a certain deviation in their barrel heights.

[0003] At present, there are two methods for screwing caps on packaging barrels of different barrel heights. The first method is to use a servo motor in conjunction with a module to locate the height position. This method has extremely high positioning accuracy and can also be applied to different types of packaging barrels. However, the cost of servo motors and modules is relatively high, especially in explosion-proof situations. The cost is even higher. Affected by the cost, its promotion is subject to certain restrictions. The second method is to use a cylinder lifting method to locate the height position. The cylinder lifting generally uses a unified air source pressure operation method for the entire line of pneumatic components, that is, the lifting air source pressure is generally around 5 bar. When screwing caps on iron barrels of different barrel heights, since the iron barrels use iron caps, the barrel caps are not easily damaged under the action of large external forces. However, when screwing caps on plastic barrels of different barrel heights, since the plastic barrels are made of plastic, this method is very likely to cause damage to the barrel caps, reducing the success rate of screwing caps.

[0004] Therefore, there is an urgent need to provide a capping system to solve the above problems. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a capping system which can be applied to the capping of packaging barrels of different types and different barrel heights and has lower cost.

[0006] The utility model provides a capping system, comprising: a capping mechanism and a pneumatic control mechanism connected to the capping mechanism;

[0007] The capping mechanism comprises a first cylinder, a second cylinder, a positioning sleeve, and a capping head, wherein the positioning sleeve is sleeved on the outside of the capping head, the positioning sleeve is connected to the first cylinder, and the capping head is connected to the second cylinder, the first cylinder is used to drive the positioning sleeve to move in a direction close to or away from the barrel cover, and the second cylinder is used to drive the capping head to move in a direction close to or away from the barrel cover to tighten or unscrew the barrel cover;

[0008] The pneumatic control mechanism includes an air source, a first pneumatic control component and a second pneumatic control component. One end of the first pneumatic control component and the second pneumatic control component are connected to the air source, and the other end of the first pneumatic control component and the second pneumatic control component are connected to the first cylinder. When the first cylinder drives the positioning sleeve to move in a direction away from the barrel cover, the first pneumatic control component and the second pneumatic control component work simultaneously to provide the first cylinder with gas of a first preset pressure. When the first cylinder drives the positioning sleeve to move in a direction close to the barrel cover, the second pneumatic control component works to provide the first cylinder with gas of a second preset pressure. The first preset pressure is greater than the second preset pressure.

[0009] Furthermore, the first preset pressure is 4-6 bar, and the second preset pressure is 0.5-1 bar.

[0010] Further, the first pneumatic control assembly includes a first gas pipeline and a first pressure regulating valve, a first solenoid valve and a one-way valve arranged on the first gas pipeline, the first pressure regulating valve is arranged between the gas source and the first solenoid valve, the first solenoid valve is arranged between the first pressure regulating valve and the one-way valve, and the one-way valve is arranged between the first solenoid valve and the first cylinder;

[0011] and / or,

[0012] The second pneumatic control component includes a second gas pipeline and a second pressure regulating valve and a second solenoid valve arranged on the second gas pipeline, the second solenoid valve is arranged between the second pressure regulating valve and the first cylinder, and the second pressure regulating valve is arranged on a side of the second solenoid valve away from the first cylinder.

[0013] Furthermore, the pneumatic control mechanism also includes a third pneumatic control component, one end of the third pneumatic control component is connected to the gas source, the other end of the third pneumatic control component is connected to the second cylinder, and the third pneumatic control component provides gas of a third preset pressure to the second cylinder.

[0014] Furthermore, the third preset pressure is 1.5-2 bar.

[0015] Furthermore, the third pneumatic control component includes a third gas pipeline and a third pressure regulating valve and a third solenoid valve arranged on the third gas pipeline, the third solenoid valve is arranged between the third pressure regulating valve and the second cylinder, and the third pressure regulating valve is arranged on a side of the third solenoid valve away from the second cylinder.

[0016] Furthermore, the screw capping mechanism also includes a rotary drive assembly and a screw capping core assembly, one end of the screw capping core assembly is connected to the rotary drive assembly, and the other end of the screw capping core assembly is connected to the screw capping head, and the rotary drive assembly is used to drive the screw capping core assembly to rotate according to the angle direction of the slot of the barrel cover to drive the screw capping head to rotate to a preset angle.

[0017] Furthermore, the screw capping mechanism also includes a distance rod, a telescopic member and a floating connecting sleeve, wherein one end of the distance rod away from the screw capping head is connected to the rotary drive assembly, and one end of the distance rod close to the screw capping head is connected to the floating connecting sleeve, and the telescopic member is sleeved on the distance rod.

[0018] Furthermore, the screw cap mechanism also includes a connecting component, which is used to connect the first cylinder and the positioning sleeve. The connecting component includes a first connecting plate, a second connecting plate, a third connecting plate and a fourth connecting plate. The first connecting plate is connected to an end of the distance rod close to the rotation drive assembly, the second connecting plate is connected to an end of the floating connecting sleeve close to the positioning sleeve, both ends of the third connecting plate are respectively connected to the first connecting plate and the second connecting plate, a side of the third connecting plate away from the distance rod is connected to a side of the fourth connecting plate close to the distance rod, and a side of the fourth connecting plate away from the distance rod is connected to the first cylinder.

[0019] Furthermore, the capping mechanism also includes a reducer, and the reducer is arranged between the rotary drive assembly and the capping head.

[0020] One or more of the above embodiments of the present invention have at least one or more of the following beneficial effects:

[0021] The capping system provided by the utility model can be applied to the capping of packaging barrels of different types and different barrel heights. Specifically, the capping system includes a capping mechanism and a pneumatic control mechanism connected to the capping mechanism, the capping mechanism includes a first cylinder, a second cylinder, a positioning sleeve, and a capping head, and the pneumatic control mechanism includes an air source, a first pneumatic control component, and a second pneumatic control component. When the first cylinder drives the positioning sleeve to move in a direction away from the barrel cover, the first pneumatic control component and the second pneumatic control component work at the same time, providing a larger air source pressure for the first cylinder, thereby ensuring the capping efficiency of the capping system; when the first cylinder drives the positioning sleeve to move in a direction close to the barrel cover, the second pneumatic control component works, providing a smaller air source pressure for the first cylinder, so that the positioning sleeve can slowly reach the specified position, thereby avoiding damage to packaging barrels of different types and different barrel heights, and can also achieve precise positioning. In addition, the capping system has a simple structure and low use cost.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The disclosure of the present invention will become easier to understand with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present invention. In addition, similar numbers in the drawings are used to represent similar components, among which:

[0024] Figure 1 is a structural schematic diagram of a capping system provided in an embodiment of the present application;

[0025] Figure 2 is a schematic diagram of the overall structure of the capping mechanism provided in an embodiment of the present application;

[0026] Figure 3 is a schematic cross-sectional structure diagram of a capping mechanism provided in an embodiment of the present application;

[0027] Figure 4 It is a schematic diagram of the structure of the capping head provided in the embodiment of the present application.

[0028] Description of Reference Numerals

[0029] The capping mechanism 100, the first cylinder 110, the second cylinder 120, the positioning sleeve 130, the capping head 140, the fixing part 141, the column 142, the rotation drive assembly 150, the capping core assembly 160, the distance rod 170, the telescopic part 180, the floating connection sleeve 190, the pneumatic control mechanism 200, the first pneumatic control assembly 210, the first gas pipeline 211, the first pressure regulating valve 212, the first solenoid valve 213, the one-way valve 214, the second pneumatic control assembly 220, the second gas pipeline 221, the second pressure regulating valve 222, the second solenoid valve 223, the third pneumatic control assembly 230, the third gas pipeline 231, the third pressure regulating valve 232, the third solenoid valve 233, the connecting assembly 400, the first connecting plate 410, the second connecting plate 420, the third connecting plate 430, the fourth connecting plate 440, and the reducer 500. DETAILED DESCRIPTION

[0030] Some embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0031] As shown in the background technology, there are two methods for screwing lids on packaging barrels of different barrel heights. The first method is to use a servo motor in conjunction with a module to locate the height position. However, the cost of the servo motor and the module is relatively high, and its promotion is subject to certain restrictions. The second method is to use a cylinder lifting method to locate the height position. The cylinder lifting generally uses an operation method that unifies the air source pressure of the entire line of pneumatic components, that is, the lifting air source pressure is generally around 5 bar. When screwing lids on plastic barrels of different barrel heights, since the plastic barrels are made of plastic, this method is very likely to cause damage to the barrel lid, reducing the success rate of screwing lids.

[0032] In this regard, the utility model creatively proposes a capping system, when the first cylinder drives the positioning sleeve to move in the direction away from the barrel cover, the first pneumatic control component and the second pneumatic control component work simultaneously to provide a larger air source pressure for the first cylinder, thereby ensuring the capping efficiency of the capping system; when the first cylinder drives the positioning sleeve to move in the direction close to the barrel cover, the second pneumatic control component works to provide a smaller air source pressure for the first cylinder, so that the positioning sleeve can slowly reach the specified position, thereby avoiding damage to packaging barrels of different types and different barrel heights.

[0033] The present invention will be described in detail below through specific embodiments.

[0034] Embodiment 1

[0035] In view of the above problems, the embodiment of the utility model creatively proposes a capping system, such as Figure 1 As shown, refer to Figure 2 and Figure 3 The capping mechanism includes a first cylinder 110 , a second cylinder 120 , a positioning sleeve 130 , and a capping head 140 . The pneumatic control mechanism 200 includes an air source, a first pneumatic control component 210 , and a second pneumatic control component 220 .

[0036] Specifically, the positioning sleeve 130 is looped around the outside of the capping head 140, the positioning sleeve 130 is connected to the first cylinder 110, the capping head 140 is connected to the second cylinder 120, the first cylinder 110 is used to drive the positioning sleeve 130 to move in a direction close to or away from the barrel cover, and the second cylinder 120 is used to drive the capping head 140 to move in a direction close to or away from the barrel cover to tighten or unscrew the barrel cover. The positioning sleeve 130 provided in the embodiment of the present application is a hollow columnar structure, and the positioning sleeve 130 plays the role of positioning and protecting the capping head 140.

[0037] When the barrel cover is installed on the corresponding packaging barrel, the first cylinder 110 drives the positioning sleeve 130 to move in the direction close to the barrel cover until the positioning sleeve 130 abuts against the packaging barrel, and then the second cylinder 120 drives the capping head 140 to move in the direction close to the barrel cover until the barrel cover is tightened. When the barrel cover is removed, the second cylinder 120 drives the capping head 140 to move in the direction away from the barrel cover until the barrel cover is screwed out, and then the first cylinder 110 drives the positioning sleeve 130 to move in the direction away from the barrel cover.

[0038] In a specific embodiment, the first cylinder 110 is a rodless cylinder. Since the rodless cylinder does not have a traditional rigid piston rod, its structure is more compact and can effectively save installation space. In addition, due to its compact design and installation convenience, the rodless cylinder can reduce overall costs.

[0039] In the prior art, in order to reduce costs, the height position is usually positioned by a cylinder lifting method. The cylinder lifting generally adopts the operation method of unifying the air source pressure of the entire line of pneumatic components, that is, the lifting air source pressure is generally around 5 bar. When screwing the caps on iron barrels of different barrel heights, since the iron barrels use iron covers, the barrel covers are not easily damaged under the action of large external forces. However, when screwing the caps on plastic barrels of different barrel heights, due to the action of the cylinder, the positioning sleeve 130 will severely press the barrel surface. Since the plastic barrel is made of plastic, this method is very likely to cause damage to the barrel cover, reducing the success rate of screwing the caps.

[0040] In order to solve this problem, when the first cylinder 110 drives the positioning sleeve 130 to move away from the barrel cover, the first pneumatic control component 210 and the second pneumatic control component 220 work at the same time to provide a larger air source pressure for the first cylinder 110, thereby ensuring the capping efficiency of the capping system; when the first cylinder 110 drives the positioning sleeve 130 to move towards the barrel cover, the second pneumatic control component 220 works to provide a smaller air source pressure for the first cylinder 110, so that the positioning sleeve 130 can slowly reach the specified position, thereby avoiding damage to packaging barrels of different types and different barrel heights, and can also achieve precise positioning. In addition, the capping system has a simple structure and low use cost.

[0041] Specifically, one end of the first pneumatic control component 210 and the second pneumatic control component 220 are connected to the air source, and the other end of the first pneumatic control component 210 and the second pneumatic control component 220 are connected to the first cylinder 110. When the first cylinder 110 drives the positioning sleeve 130 to move in a direction away from the barrel cover, the first pneumatic control component 210 and the second pneumatic control component 220 work simultaneously to provide the first cylinder 110 with gas of a first preset pressure. When the first cylinder 110 drives the positioning sleeve 130 to move in a direction close to the barrel cover, the second pneumatic control component 220 works to provide the first cylinder 110 with gas of a second preset pressure, and the first preset pressure is greater than the second preset pressure.

[0042] Embodiment 2

[0043] Based on the first embodiment, the pneumatic control mechanism 200 is further described in detail in this embodiment.

[0044] The first pneumatic control assembly 210 includes a first gas pipeline 211 and a first pressure regulating valve 212, a first solenoid valve 213 and a one-way valve 214 arranged on the first gas pipeline 211. The first pressure regulating valve 212 is arranged between the gas source and the first solenoid valve 213, the first solenoid valve 213 is arranged between the first pressure regulating valve 212 and the one-way valve 214, and the one-way valve 214 is arranged between the first solenoid valve 213 and the first cylinder 110. Specifically, the gas outlet of the gas source is connected to the gas inlet of the first pressure regulating valve 212, the gas outlet of the first pressure regulating valve 212 is connected to the gas inlet of the first solenoid valve 213, the first pressure regulating valve 212 is used to adjust the pressure of the gas provided by the gas source, and the one-way valve 214 is used to ensure the stability of the pressure of the first cylinder 110 so that the gas does not flow back.

[0045] The second pneumatic control component 220 includes a second gas pipeline 221 and a second pressure regulating valve 222 and a second solenoid valve 223 arranged on the second gas pipeline 221. The second solenoid valve 223 is arranged between the second pressure regulating valve 222 and the first cylinder 110. The second pressure regulating valve 222 is arranged on a side of the second solenoid valve 223 away from the first cylinder 110.

[0046] In a specific embodiment, the first preset pressure is 4-6 bar, preferably, the first preset pressure is 5 bar, and the second preset pressure is 0.5-1 bar. When the first cylinder 110 drives the positioning sleeve 130 to move in a direction away from the barrel cover, since it is necessary to overcome the gravity of the cap screwing mechanism 100, a relatively high pressure of the air source pressure is required. At this time, the first pneumatic control component 210 and the second pneumatic control component 220 work simultaneously to provide the first cylinder 110 with a pressure of 4-6 bar of gas. When the first cylinder 110 drives the positioning sleeve 130 to move in a direction close to the barrel cover, the second pneumatic control component 220 works to provide the first cylinder 110 with a pressure of 0.5-1 bar of gas. The pressure can be adjusted by the second pressure regulating valve 222. Under the air source pressure, the downward pressure of the first cylinder 110 is about 70N. Under this pressure, when the positioning sleeve 130 acts on the barrel surface, it will not damage the barrel surface. The barrel surface itself can be used as a limiting structure for the first cylinder 110. In this way, the problem that the barrel height is different and the existing screw-on method will cause damage to the barrel cover can be solved. If the first pneumatic control component 210 and the second pneumatic control component 220 provided by the present application are not used, the first cylinder 110 directly uses gas with a pressure of 4-6 bar, and the downward pressure of the first cylinder 110 can reach 700N. The cylinder diameter of the first cylinder 110 is 40mm. Under this pressure, the barrel surface will be severely squeezed and deformed.

[0047] Furthermore, the pneumatic control mechanism 200 also includes a third pneumatic control component 230, one end of which is connected to the gas source, and the other end of which is connected to the second cylinder 120, and the third pneumatic control component 230 provides gas of a third preset pressure to the second cylinder 120. The third preset pressure is 1.5-2 bar, at which the capping head 140 can perform lifting and lowering movements. In addition, during the process of opening the cap, the lifting force of the screw thread can overcome the downward force of the second cylinder 120. If the pressure is not adjusted and a gas pressure of 4-6 bar is directly used, the gas pressure of 4-6 bar is pressed on the barrel cover, and the thread is not easy to unscrew, especially for plastic barrel covers. Under the gas pressure of 4-6 bar, the plastic barrel cover will be damaged, thereby affecting the product quality.

[0048] Specifically, the third pneumatic control assembly 230 includes a third gas pipeline 231 and a third pressure regulating valve 232 and a third solenoid valve 233 disposed on the third gas pipeline 231. The third solenoid valve 233 is disposed between the third pressure regulating valve 232 and the second cylinder 120. The third pressure regulating valve 232 is disposed on a side of the third solenoid valve 233 away from the second cylinder 120. The third pressure regulating valve is used to adjust the pressure of the gas entering the second cylinder 120.

[0049] For the undescribed parts in the second embodiment, please refer to the description of the aforementioned embodiment, which will not be repeated here.

[0050] Embodiment 3

[0051] Based on the first and second embodiments, this embodiment further describes the structure of the cap screwing mechanism 100 in detail.

[0052] The capping mechanism 100 provided in the present application further includes a rotation drive assembly 150 and a capping core assembly 160, one end of the capping core assembly 160 is connected to the rotation drive assembly 150, and the other end of the capping core assembly 160 is connected to the capping head 140, and the rotation drive assembly 150 is used to drive the capping core assembly 160 to rotate according to the angle direction of the slot of the barrel cover to drive the capping head 140 to rotate to a preset angle. The preset angle here refers to the angle at which the capping head 140 can be just stuck in the slot of the barrel cover. The rotation drive assembly 150 includes a pneumatic motor, an electric motor or a servo motor.

[0053] Further, such as Figure 4 As shown, the capping head 140 includes a fixing member 141 and a column 142 distributed on the fixing member 141. The shape and size of the column 142 are adapted to the slot of the barrel cover to facilitate the column 142 in the capping head 140 to be stuck in the slot of the barrel cover. Since the slots of most barrel covers on the market are cross-shaped, in order to facilitate the capping head 140 to be stuck in the slot of the barrel cover, the number of the columns 142 in the embodiment of the present application is set to 4, and the 4 columns 142 are just stuck in the slot of the barrel cover, which is convenient for the next step of removing the cover. It should be noted here that when the slot of the barrel cover is of other shapes, the number of the columns 142 can be adjusted accordingly according to the shape of the slot.

[0054] Furthermore, the capping mechanism 100 further includes a distance rod 170, a telescopic member 180 and a floating connection sleeve 190. The end of the distance rod 170 away from the capping head 140 is connected to the rotation drive assembly 150, and the end of the distance rod 170 close to the capping head 140 is connected to the floating connection sleeve 190. The telescopic member 180 is sleeved on the distance rod 170. Among them, the distance rod 170 is a column structure, and the number of the distance rods 170 is preferably three. In the present application, the distance rod 170 can improve the strength support. The telescopic member 180 can be a telescopic spring, which can effectively improve the shock absorption effect when the capping head 140 is pressed down, avoid the capping head 140 directly pressing down on the barrel cover, and improve the stability during the capping process. In addition, for injection molded barrels such as plastic packaging barrels, the barrel mouth is not perpendicular to the barrel surface. The positioning sleeve 130, the screw cap core assembly 160 and the rotating drive assembly 150 are connected by a floating connecting sleeve 190, so that the relative verticality between the screw cap head 140 and the barrel surface can always be guaranteed, thereby ensuring the success rate of opening the lid.

[0055] In order to achieve more precise motion control and protect the rotary drive assembly 150 to extend its service life, the capping mechanism 100 further includes a reducer 500, which is disposed between the rotary drive assembly 150 and the capping head 140. By connecting the reducer 500 to the rotary drive assembly 150, the output speed of the rotary drive assembly 150 can be reduced, thereby increasing its output torque, and thus meeting higher load requirements. In addition, by connecting the reducer 500 to the rotary drive assembly 150 to reduce the output speed of the rotary drive assembly 150, the motion control accuracy can also be improved, thereby meeting higher accuracy requirements.

[0056] In order to connect the first cylinder 110 and the positioning sleeve 130 together, the capping mechanism 100 further includes a connecting assembly 400, which includes a first connecting plate 410, a second connecting plate 420, a third connecting plate 430 and a fourth connecting plate 440. The first connecting plate 410 is connected to an end of the distance rod 170 close to the rotation drive assembly 150, the second connecting plate 420 is connected to an end of the floating connecting sleeve 190 close to the positioning sleeve 130, the two ends of the third connecting plate 430 are respectively connected to the first connecting plate 410 and the second connecting plate 420, the side of the third connecting plate 430 away from the distance rod 170 is connected to the side of the fourth connecting plate 440 close to the distance rod 170, and the side of the fourth connecting plate 440 away from the distance rod 170 is connected to the first cylinder 110. The connection between the third connecting plate 430 and the fourth connecting plate 440 and the connection between the fourth connecting plate 440 and the first cylinder 110 can be made by bolts, rivets, bonding, welding, etc., and users can choose according to actual needs, and no specific limitation is made here. Using the first connecting plate 410, the second connecting plate 420, the third connecting plate 430, and the fourth connecting plate 440 to connect the first cylinder 110 and the positioning sleeve 130 together can make the structure of the entire system more compact and effectively save the space occupied by the system.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0059] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A capping system, characterized in that: include: A capping mechanism and a pneumatic control mechanism connected to the capping mechanism; The capping mechanism comprises a first cylinder, a second cylinder, a positioning sleeve, and a capping head, wherein the positioning sleeve is sleeved on the outside of the capping head, the positioning sleeve is connected to the first cylinder, and the capping head is connected to the second cylinder, the first cylinder is used to drive the positioning sleeve to move in a direction close to or away from the barrel cover, and the second cylinder is used to drive the capping head to move in a direction close to or away from the barrel cover to tighten or unscrew the barrel cover; The pneumatic control mechanism includes an air source, a first pneumatic control component and a second pneumatic control component. One end of the first pneumatic control component and the second pneumatic control component are connected to the air source, and the other end of the first pneumatic control component and the second pneumatic control component are connected to the first cylinder. When the first cylinder drives the positioning sleeve to move in a direction away from the barrel cover, the first pneumatic control component and the second pneumatic control component work simultaneously to provide the first cylinder with gas of a first preset pressure. When the first cylinder drives the positioning sleeve to move in a direction close to the barrel cover, the second pneumatic control component works to provide the first cylinder with gas of a second preset pressure. The first preset pressure is greater than the second preset pressure.

2. The capping system according to claim 1, characterized in that: The first preset pressure is 4-6 bar, and the second preset pressure is 0.5-1 bar.

3. The capping system according to claim 1, characterized in that: The first pneumatic control assembly includes a first gas pipeline and a first pressure regulating valve, a first solenoid valve and a one-way valve arranged on the first gas pipeline, wherein the first pressure regulating valve is arranged between the gas source and the first solenoid valve, the first solenoid valve is arranged between the first pressure regulating valve and the one-way valve, and the one-way valve is arranged between the first solenoid valve and the first cylinder; and / or, The second pneumatic control component includes a second gas pipeline and a second pressure regulating valve and a second solenoid valve arranged on the second gas pipeline, the second solenoid valve is arranged between the second pressure regulating valve and the first cylinder, and the second pressure regulating valve is arranged on a side of the second solenoid valve away from the first cylinder.

4. The capping system according to claim 1, characterized in that: The pneumatic control mechanism also includes a third pneumatic control component, one end of which is connected to the gas source, and the other end of which is connected to the second cylinder, and the third pneumatic control component provides gas of a third preset pressure to the second cylinder.

5. The capping system according to claim 4, characterized in that: The third preset pressure is 1.5-2 bar.

6. The capping system according to claim 4, characterized in that: The third pneumatic control component includes a third gas pipeline and a third pressure regulating valve and a third solenoid valve arranged on the third gas pipeline. The third solenoid valve is arranged between the third pressure regulating valve and the second cylinder. The third pressure regulating valve is arranged on a side of the third solenoid valve away from the second cylinder.

7. The capping system according to any one of claims 1 to 6, characterized in that: The capping mechanism also includes a rotary drive assembly and a capping core assembly, one end of the capping core assembly is connected to the rotary drive assembly, and the other end of the capping core assembly is connected to the capping head, and the rotary drive assembly is used to drive the capping core assembly to rotate according to the angle direction of the slot of the barrel cover to drive the capping head to rotate to a preset angle.

8. The capping system according to claim 7, characterized in that: The capping mechanism also includes a distance rod, a telescopic member and a floating connection sleeve. The end of the distance rod away from the capping head is connected to the rotation drive assembly, the end of the distance rod close to the capping head is connected to the floating connection sleeve, and the telescopic member is sleeved on the distance rod.

9. The capping system according to claim 8, characterized in that: The screw cap mechanism also includes a connecting component, which is used to connect the first cylinder and the positioning sleeve. The connecting component includes a first connecting plate, a second connecting plate, a third connecting plate and a fourth connecting plate. The first connecting plate is connected to an end of the distance rod close to the rotation drive assembly, the second connecting plate is connected to an end of the floating connecting sleeve close to the positioning sleeve, both ends of the third connecting plate are respectively connected to the first connecting plate and the second connecting plate, a side of the third connecting plate away from the distance rod is connected to a side of the fourth connecting plate close to the distance rod, and a side of the fourth connecting plate away from the distance rod is connected to the first cylinder.

10. The capping system according to claim 7, characterized in that: The capping mechanism further comprises a reducer, and the reducer is arranged between the rotary drive assembly and the capping head.

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