Magnetic levitation bottle assembly

Abstract

This invention discloses a magnetic levitation bottle-fixing assembly, comprising a control cavity, a piston rod, a bottle-fixing head, a levitation magnet, an upper magnet, a lower magnet, a side abutment wheel, a cam, and a motor. The upper and lower magnets are fixed in the control cavity, and the levitation magnet is movably disposed between them with opposite polarities. The levitation magnet is mounted on the piston rod, the lower end of which is connected to the bottle-fixing head. The side abutment wheel is connected to the side of the levitation magnet and contacts the cam. The motor drives the cam to rotate. The cam has a first protrusion and a second protrusion on its circumference, with the first protrusion being higher than the second protrusion. The side abutment wheel contacts the second protrusion at a higher position and the first protrusion at a lower position. This invention aims to solve the problems of large pressing impact, insufficient response speed and adaptability, and poor positioning accuracy and maintainability in existing cylinder-driven bottle-fixing structures, providing a magnetic levitation bottle-fixing assembly that balances rapid response, smooth pressing, accurate positioning, and low maintenance costs.

Description

Technical Field

[0001] This invention relates to the field of packaging equipment technology, and in particular to a magnetic levitation bottle-fixing assembly. Background Technology

[0002] In automated production lines in industries such as packaging, food, and pharmaceuticals, bottle positioning assemblies are core components that ensure precise bottle positioning and stable operation of subsequent processes such as filling, labeling, and sealing. With the increasing speed of production lines and the diversification of bottle materials (such as thin-walled plastic bottles, fragile glass bottles, and irregularly shaped bottles), higher requirements are placed on the positioning accuracy, bottle protection effect, motion response speed, and structural durability of bottle positioning assemblies.

[0003] Among existing bottle-fixing technologies, the most widely used is the cylinder-driven bottle-fixing structure. Its core design involves a cylinder directly driving a piston rod to move up and down, with the cylinder mounted on an elastic support platform. The cylinder's extension and retraction force presses and positions the bottle head against the bottle, while the elastic support platform cushions the impact of the pressing. This type of structure is widely used in low-to-medium speed production lines due to its simple principle and low cost. However, it still has key technical shortcomings in practical application:

[0004] Firstly, the impact of pressing is large, which can easily damage the bottle. The low precision of the cylinder's extension and retraction speed and thrust adjustment makes it difficult to achieve precise acceleration and deceleration when the bottle head is in place. The impact force at the moment of contact with the bottle is large, which can easily cause thin-walled or fragile bottles to be dented or broken, even with the help of an elastic support platform. Furthermore, the elastic support platform is prone to fatigue and deformation after long-term use, which further reduces the positioning stability.

[0005] Secondly, the response speed and adaptability are insufficient. The cylinder drive relies on compressed air for charging and discharging, and the inherent delay limits the response speed, making it difficult to adapt to the pace of high-speed production lines; moreover, the thrust and stroke adjustment operations are cumbersome and cannot be quickly adapted to different bottle sizes, resulting in poor versatility.

[0006] Third, the positioning accuracy and maintainability are poor. The cylinder extension and retraction stroke is easily affected by fluctuations in air source pressure and wear of components, resulting in inconsistent pressing depth and insufficient positioning accuracy. At the same time, the cylinder seals and piston rod are easily affected by environmental impurities and wear, resulting in high maintenance frequency and cost, and there is a risk of air leakage.

[0007] In summary, existing cylinder-driven bottle-fixing structures are insufficient to meet the demands of automated production of bottles in various sizes and at high speeds. Therefore, designing a bottle-fixing assembly that balances rapid response, smooth pressing, precise positioning, and low maintenance costs has become a pressing technical challenge in this field. Summary of the Invention

[0008] The purpose of this invention is to provide a magnetic levitation bottle-fixing assembly, which aims to solve the technical problems of existing cylinder-driven bottle-fixing structures, such as large pressing impact, insufficient response speed and adaptability, poor positioning accuracy and maintainability, and to provide a magnetic levitation bottle-fixing assembly that takes into account fast response, stable pressing, accurate positioning and low maintenance cost.

[0009] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0010] A magnetic levitation bottle-fixing assembly includes a control cavity, a piston rod, a bottle-fixing head, a levitation magnet, an upper magnet, a lower magnet, a side abutment wheel, a cam, and a motor. The upper magnet and the lower magnet are fixed in the control cavity. The levitation magnet is movably disposed between the upper magnet and the lower magnet and has opposite polarities. The levitation magnet is disposed on the piston rod, and the lower end of the piston rod is connected to the bottle-fixing head. The side abutment wheel is connected to the side of the levitation magnet. The cam contacts the side abutment wheel, and the motor drives the cam to rotate. The cam has a first protrusion and a second protrusion on its circumference. The first protrusion is higher than the second protrusion. When the side abutment wheel is in a high position, it contacts the second protrusion, and when it is in a low position, it contacts the first protrusion.

[0011] In a preferred embodiment, the piston rod passes through the control cavity from top to bottom, and a guide sleeve is provided at the part of the piston rod that passes through the control cavity.

[0012] In a preferred embodiment, the guide sleeve is made of bronze or polytetrafluoroethylene, and the inner hole of the guide sleeve is clearance-fitted with the piston rod, with a clearance of 0.01-0.03 mm.

[0013] In a preferred embodiment, both the first protrusion and the second protrusion are detachable structures.

[0014] In a preferred embodiment, the end faces of the first protrusion and the second protrusion are both arc-shaped structures, which are adapted to fit the wheel surface of the side abutment wheel to reduce contact wear.

[0015] In a preferred embodiment, the wheel surface of the side abutment wheel is made of modified polytetrafluoroethylene.

[0016] In a preferred embodiment, the first protrusion and the second protrusion cooperate to achieve the downward pressing and bottle-fixing action of the bottle-fixing head: in the initial state, the suspending magnet is in a high position, and the side abutment wheel is in contact with the second protrusion; when pressing down, the motor drives the cam to rotate at high speed for a predetermined time, and the second protrusion pushes the side abutment wheel to accelerate downward movement. After the contact is released, the side abutment wheel, the piston rod, and the bottle-fixing head move downward due to inertia and decelerate under the action of magnetic force. When the bottle-fixing head stops contacting the top of the bottle, the first protrusion contacts the side abutment wheel to achieve stable bottle fixing.

[0017] In a preferred embodiment, during the downward movement of the bottle-fixing head, when it initially contacts the top of the bottle, the cam and the side abutment wheel are in a non-contact state, and the magnetic deceleration achieves non-rigid pressing of the bottle.

[0018] In a preferred embodiment, a pressure sensor is provided between the bottle-fixing head and the piston rod. The pressure sensor is used to collect pressure data of the bottle-fixing head on the bottle body, and the pressure sensor is signal-connected to the control module of the motor.

[0019] In a preferred embodiment, the control module determines whether the pressure data collected by the pressure sensor exceeds a preset value range. If the pressure exceeds the preset value, the initial rotation speed of the motor is slowed down; if the pressure is below the preset value, the initial rotation speed of the motor is increased to adjust the pushing speed of the second protrusion on the side abutment wheel.

[0020] Compared with existing technologies, this invention combines magnetic levitation characteristics with a dual-protrusion cam drive structure. By setting the upper and lower magnets with opposite polarities to the levitation magnet, the levitation magnet is made to float within the control cavity, providing a basis for rapid response and smooth movement of the component. At the same time, the cam axle is provided with a first protrusion and a second protrusion of different heights. The differentiated structure of the two protrusions enables staged driving. Combined with the precise driving of the cam by the motor, an orderly motion transmission logic is formed. Furthermore, the side abutment wheel contacts the lower second protrusion when it is in a high position and contacts the higher first protrusion when it is in a low position, ensuring precise control of the motion stroke and positioning accuracy. The complete working process is as follows: In the initial state, the levitation magnet is in a high position under the action of magnetic forces with opposite polarities, and the side abutment wheel remains in contact with the second protrusion; when it is necessary to press down and fix the bottle, the motor drives the cam to rotate at high speed for a predetermined time, and the second protrusion then moves the side abutment wheel, causing the levitation magnet, piston rod, and bottle fixing head to start quickly and accelerate downward; when the second protrusion rotates and disengages from the contact state with the side abutment wheel, the side abutment wheel, piston rod, and bottle fixing head continue to move downward under the action of inertia, while the upper magnet and the lower magnet... The iron gradually decelerates under the magnetic force of the levitation magnet; when the bottle-fixing head contacts the top of the bottle, the movement speed drops to the minimum and stops. At this time, the first protrusion rotates to the position of contacting the side abutment wheel, realizing stable support for the levitation magnet and completing precise bottle fixing; after the bottle fixing is completed, the motor continues to drive the cam to rotate, the first protrusion disengages from contact, the levitation magnet resets upward under the action of magnetic force, driving the piston rod, bottle-fixing head and side abutment wheel back to the high position, and the side abutment wheel contacts the second protrusion again, waiting for the next bottle fixing action. In terms of technical effects, firstly, the magnetic levitation structure, combined with the rapid movement of the second protrusion, significantly improves the motion response speed of the bottle-fixing head, effectively adapting to the pace of high-speed production lines and successfully solving the response delay problem caused by the reliance on compressed air for inflation and deflation in existing cylinder drives. Secondly, the magnetic deceleration design after the second protrusion disengages minimizes the impact force when the bottle-fixing head contacts the bottle. Combined with the non-rigid pressing method, it completely avoids dents and damage to thin-walled and fragile bottles. At the same time, the wear-free characteristics of magnetic levitation and the precise coordination of the two protrusions reduce component wear, lower maintenance frequency and costs, and improve the shortcomings of existing cylinder structures such as easy wear of seals and high maintenance costs. Thirdly, the height difference design between the first and second protrusions ensures consistent positioning depth for each bottle fixation, unaffected by external factors such as air source pressure fluctuations, significantly improving positioning accuracy. Moreover, it eliminates the need for complex stroke adjustment structures, enabling rapid adaptation to different bottle sizes, enhancing the versatility of the components, and solving the problems of poor adaptability and insufficient positioning accuracy in existing cylinder drives. Attached Figure Description

[0021] Figure 1 This invention relates to a structural schematic diagram of a magnetic levitation bottle-fixing assembly.

[0022] Figure 2 This is a schematic diagram of the structure of a cam in a magnetic levitation bottle-fixing assembly, which relates to the present invention.

[0023] Control chamber 1; piston rod 2; bottle head 3; suspending magnet 4; upper magnet 5; lower magnet 6; side abutting wheel 7; cam 8; first protrusion 9; second protrusion 10; motor 11; pressure sensor 12. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0026] like Figure 1 and Figure 2 As shown, a magnetic levitation bottle-fixing assembly includes a control chamber 1, a piston rod 2, a bottle-fixing head 3, a levitation magnet 4, an upper magnet 5, a lower magnet 6, a side abutment wheel 7, a cam 8, and a motor 11. The upper magnet 5 and the lower magnet 6 are fixed in the control chamber 1. The levitation magnet 4 is movably disposed between the upper magnet 5 and the lower magnet 6 with opposite polarities. The levitation magnet 4 is disposed on the piston rod 2. The lower end of the piston rod 2 is connected to the bottle-fixing head 3. The side abutment wheel 7 is connected to the side of the levitation magnet 4. The cam 8 contacts the side abutment wheel 7. The motor 11 drives the cam 8 to rotate. The circumference of the cam 8 is provided with a first protrusion 9 and a second protrusion 10. The height of the first protrusion 9 is higher than that of the second protrusion 10. When the side abutment wheel 7 is in a high position, it contacts the second protrusion 10, and when it is in a low position, it contacts the first protrusion 9.

[0027] This embodiment of a magnetic levitation bottle-fixing assembly combines magnetic levitation characteristics with a double-protrusion cam drive structure. By setting the upper magnet 5 and lower magnet 6 with opposite polarities to the levitation magnet 4, the levitation magnet 4 is made to float in the control cavity 1, providing a basis for the rapid response and smooth movement of the component. At the same time, the axle of the cam 8 is provided with a first protrusion 9 and a second protrusion 10 of different heights. The differentiated structure of the two protrusions realizes staged driving. With the precise driving of the cam 8 by the motor 11, an orderly motion transmission logic is formed. When the side abutment wheel 7 is in a high position, it contacts the lower second protrusion 10, and when it is in a low position, it contacts the higher first protrusion 9, ensuring precise control of the motion stroke and positioning accuracy. The complete working process is as follows: In the initial state, the levitation magnet 4 is in a high position under the action of magnetic forces with opposite polarities, and the side abutment wheel 7 is in contact with the second protrusion 10; when it is necessary to press down and fix the bottle, the motor 11 drives the cam 8 to rotate at high speed for a predetermined time, and the second protrusion 10 then moves the side abutment wheel 7, causing the levitation magnet 4, piston rod 2 and bottle fixing head 3 to start quickly and accelerate downward; after the second protrusion 10 rotates and disengages from the contact state with the side abutment wheel 7, the side abutment wheel 7, piston rod 2 and bottle fixing head 3 continue to move downward under the action of inertia, while the upper magnet 5 and lower magnet 6... Iron 6 gradually decelerates under the magnetic force of the levitation magnet 4; when the bottle-fixing head 3 contacts the top of the bottle, the movement speed drops to the minimum and stops. At this time, the first protrusion 9 rotates to the position of contacting the side abutment wheel 7, realizing stable support for the levitation magnet 4 and completing the precise bottle fixing; after the bottle fixing is completed, the motor 11 continues to drive the cam 8 to rotate, the first protrusion 9 disengages, the levitation magnet 4 resets upward under the action of magnetic force, driving the piston rod 2, the bottle-fixing head 3 and the side abutment wheel 7 back to the high position, and the side abutment wheel 7 contacts the second protrusion 10 again, waiting for the next bottle fixing action. In terms of technical effects, firstly, the magnetic levitation structure, combined with the rapid movement of the second protrusion 10, significantly improves the motion response speed of the bottle-fixing head 3, effectively adapting to the cycle time of high-speed production lines and successfully solving the response delay problem caused by the reliance on compressed air charging and discharging in existing cylinder drives. Secondly, the magnetic deceleration design after the second protrusion 10 disengages minimizes the impact force when the bottle-fixing head 3 contacts the bottle. Combined with the non-rigid pressing method, it completely avoids dents and damage to thin-walled and fragile bottles. At the same time, the wear-free characteristics of magnetic levitation and the precise coordination of the two protrusions reduce component wear, lower maintenance frequency and costs, and improve the shortcomings of existing cylinder structures such as easy wear of seals and high maintenance costs. Thirdly, the height difference design between the first protrusion 9 and the second protrusion 10 ensures consistent positioning depth for each bottle fixation, unaffected by external factors such as air source pressure fluctuations, significantly improving positioning accuracy. Moreover, it eliminates the need for complex stroke adjustment structures, enabling rapid adaptation to different bottle sizes, enhancing the versatility of the components, and solving the problems of poor adaptability and insufficient positioning accuracy of existing cylinder drives.

[0028] Furthermore, the piston rod 2 passes through the control cavity 1 from top to bottom, and a guide sleeve is provided at the part of the piston rod 2 that passes through the control cavity 1. The guide sleeve and the piston rod 2 are precisely matched to provide guidance and constraint for its up and down movement, limit radial swing, avoid direct friction between the piston rod 2 and the through hole of the control cavity 1, and block external impurities. This improves the coaxiality and positioning accuracy of the bottle head 3, reduces component wear, extends service life, prevents impurities from affecting the magnetic stability of the levitation magnet 4, ensures high-speed and stable operation of the component, and improves the shortcomings of insufficient positioning accuracy and frequent maintenance of existing cylinder drives.

[0029] Furthermore, the guide sleeve is made of bronze or PTFE, and its inner hole is fitted with the piston rod 2 with a clearance of 0.01-0.03mm. The use of low-friction bronze or PTFE materials, combined with a precise clearance of 0.01-0.03mm, provides stable guidance for the piston rod 2 while reducing motion friction and radial offset, balancing guidance accuracy and motion flexibility. This significantly reduces wear on the piston rod 2, extends component life, and prevents impurities from getting stuck. The precise clearance ensures the coaxiality of the bottle head 3, improves positioning accuracy, adapts to high-speed motion requirements, and solves the defects of inaccurate positioning and frequent maintenance in existing cylinder-driven systems, ensuring long-term stable operation of the component.

[0030] Furthermore, both the first protrusion 9 and the second protrusion 10 are detachable structures. The detachable design of the first protrusion 9 and the second protrusion 10 allows for assembly and fixation to the cam 8 body via bolts, clips, or other compatible connection methods. This facilitates quick replacement of protrusions of different heights and shapes according to bottle specifications, eliminating the need to replace the entire cam 8. This significantly improves component versatility, adapting to the positioning needs of multiple bottle sizes and resolving the cumbersome adjustment issues of existing cylinder-driven systems. Damaged protrusions can be replaced individually, reducing maintenance costs and spare parts inventory, while extending the service life of the cam 8 body and ensuring continuous and stable operation of the production line.

[0031] Furthermore, the end faces of the first protrusion 9 and the second protrusion 10 are both arc-shaped, fitting snugly against the wheel surface of the side abutment wheel 7, reducing contact wear. By making the end faces of the first protrusion 9 and the second protrusion 10 arc-shaped, a fitting contact form is created with the wheel surface of the side abutment wheel 7, replacing rigid planar contact. This increases the contact area and optimizes the force distribution, reducing local pressure. It significantly reduces contact wear between the protrusions and the abutment wheel, extends the service life of the components, and avoids transmission backlash due to wear. Simultaneously, it reduces movement jamming and noise, ensures smooth transmission, improves positioning accuracy, and solves the defects of existing cylinder drives and traditional mechanical contact structures, which suffer from severe wear and frequent maintenance.

[0032] Furthermore, the wheel surface of the side abutment wheel 7 is made of modified polytetrafluoroethylene (PTFE). Modified PTFE combines a low coefficient of friction with high wear resistance. Applying it to the wheel surface of the side abutment wheel 7 utilizes these material properties to reduce frictional resistance when in contact with the protrusion of the cam 8, while simultaneously improving the wheel surface's wear resistance, making it suitable for high-frequency contact transmission scenarios. This significantly reduces frictional loss between the abutment wheel and the protrusion of the cam 8, extending component lifespan and reducing maintenance frequency and costs. The low friction characteristics ensure smooth transmission, preventing jamming that could affect the bottle-setting response speed, thus meeting the requirements of high-speed production lines.

[0033] Furthermore, the first protrusion 9 and the second protrusion 10 work together to achieve the downward pressing and bottle-fixing action of the bottle-fixing head 3: In the initial state, the suspending magnet 4 is in a high position, and the side abutment wheel 7 is in contact with the second protrusion 10; when pressing down, the motor 11 drives the cam 8 to rotate at high speed for a predetermined time, and the second protrusion 10 pushes the side abutment wheel 7 to accelerate downward. After the contact is released, the side abutment wheel 7, piston rod 2 and bottle-fixing head 3 move downward due to inertia and decelerate under the action of magnetic force. When the bottle-fixing head 3 stops after contacting the top of the bottle, the first protrusion 9 contacts the side abutment wheel 7 to achieve stable bottle fixing. By utilizing the differentiated structure of the double protrusions and the synergy of magnetic levitation characteristics, the second protrusion 10 quickly pushes the abutment wheel to achieve acceleration, and after disengagement, the magnetic force naturally decelerates, and then the first protrusion 9 supports and positions the bottle at a low position, forming a phased driving logic of "acceleration-deceleration-stable stop". The second protrusion 10 drives and improves response speed, adapting to high-speed production lines; magnetic deceleration ensures that the fixed bottle head 3 makes low-impact contact with the bottle body, avoiding damage to fragile bottles; the first protrusion 9 provides precise support to ensure consistent positioning, unaffected by gas source fluctuations.

[0034] Furthermore, during the downward movement of the bottle-fixing head 3, upon initial contact with the top of the bottle, the cam 8 and the side abutment wheel 7 are in a non-contact state, achieving non-rigid pressing of the bottle body in conjunction with magnetic deceleration. As the bottle-fixing head 3 moves downward, the second protrusion 10 disengages from the side abutment wheel 7 after being driven, and the component naturally decelerates using magnetic force, maintaining a non-contact state for the initial moment of contact with the bottle body, achieving flexible pressing. This avoids rigid impacts, prevents damage to thin-walled and fragile bottles, and solves the core defect of large impacts in existing cylinder-driven systems; the pressing stability is significantly improved, ensuring the structural integrity of the bottle during positioning, while not affecting the movement response speed.

[0035] Furthermore, a pressure sensor 12 is installed between the bottle-fixing head 3 and the piston rod 2. The pressure sensor 12 is used to collect the pressure data of the bottle-fixing head 3 on the bottle body, and the pressure sensor 12 is connected to the control module of the motor 11. By setting the pressure sensor 12 between the bottle-fixing head 3 and the piston rod 2, the pressure data of the bottle-fixing head 3 pressing the bottle body is collected in real time and transmitted to the control module of the motor 11, thus constructing a closed-loop control link of "pressure detection-signal feedback". This provides accurate data support for the speed adjustment of the motor 11, realizes real-time monitoring of the pressing pressure, avoids damage to the bottle body due to excessive pressure or insecure positioning due to insufficient pressure, and solves the defect of uncontrollable pressure in existing cylinder-driven systems. In conjunction with the control module, the speed of the motor 11 is dynamically adjusted, further improving the bottle-fixing accuracy and adaptability, ensuring stable operation of the components in high-speed production, and reducing manual debugging costs.

[0036] Furthermore, the control module determines whether the pressure data collected by the pressure sensor 12 exceeds the preset value range. If it exceeds the preset value, the initial rotation speed of the motor 11 is slowed down; if it is below the preset value, the initial rotation speed of the motor 11 is increased to adjust the actuation speed of the second protrusion 10 against the side abutment wheel 7. The control module receives real-time pressure data transmitted by the pressure sensor 12 and compares it with the preset pressure range. Through closed-loop control logic, it dynamically adjusts the initial rotation speed of the motor 11—slowing down the speed when the pressure exceeds the preset value and increasing the speed when it is below the preset value—thereby changing the actuation speed of the second protrusion 10 against the side abutment wheel 7 to achieve precise matching of the pressing pressure. This achieves automatic compensation for pressure deviation, avoiding damage to the bottle due to excessive pressure or insecure positioning due to insufficient pressure, solving the defects of uncontrollable and poorly adaptable pressure in existing cylinder-driven systems. It can adapt to bottles of different strengths and weights without manual adjustment, improving component versatility and automation level, while ensuring positioning stability in high-speed production and reducing production losses caused by improper pressure.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Unless otherwise specified, an element defined by the phrase "comprising..." or "including..." does not exclude the presence of additional elements in the process, method, article, or terminal device that includes said element. Additionally, in this document, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number.

[0038] The above description of the embodiments is provided to facilitate understanding and use of the present invention by those skilled in the art. It is obvious to those skilled in the art that various modifications can be easily made to the embodiments, and the general principles described herein can be applied to other embodiments without creative effort. Therefore, the present invention is not limited to the above embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A magnetic levitation bottle-fixing assembly, characterized in that, The device includes a control chamber, a piston rod, a bottle-fixing head, a levitation magnet, an upper magnet, a lower magnet, a side abutment wheel, a cam, and a motor. The upper and lower magnets are fixed in the control chamber. The levitation magnet is movably disposed between the upper and lower magnets, and the upper and lower magnets are arranged with opposite polarities to the levitation magnet. The levitation magnet is mounted on the piston rod, and the lower end of the piston rod is connected to the bottle-fixing head. The side abutment wheel is connected to the side of the levitation magnet. The cam contacts the side abutment wheel, and the motor drives the cam to rotate. The cam has a first protrusion and a second protrusion on its circumference. The first protrusion is higher than the second protrusion. When the side abutment wheel is in a high position, it contacts the second protrusion; when it is in a low position, it contacts the second protrusion. The first protrusion is touched; the first protrusion and the second protrusion cooperate to realize the downward pressing and bottle-fixing action of the bottle-fixing head: in the initial state, the suspending magnet is in a high position, and the side abutment wheel is in contact with the second protrusion; when pressing down, the motor drives the cam to rotate at high speed for a predetermined time, and the second protrusion pushes the side abutment wheel to accelerate downward. After the contact is released, the side abutment wheel, the piston rod and the bottle-fixing head move downward by inertia and decelerate under the action of magnetic force. When the bottle-fixing head stops contacting the top of the bottle, the first protrusion contacts the side abutment wheel to realize stable bottle fixing; during the downward movement of the bottle-fixing head, when it initially contacts the top of the bottle, the cam and the side abutment wheel are in a non-contact state, and the magnetic deceleration realizes non-rigid pressing of the bottle.

2. The magnetic levitation bottle-fixing assembly according to claim 1, characterized in that, The piston rod passes through the control cavity from top to bottom, and a guide sleeve is provided at the part of the piston rod that passes through the control cavity.

3. The magnetic levitation bottle-fixing assembly according to claim 2, characterized in that, The guide sleeve is made of bronze or polytetrafluoroethylene, and the inner hole of the guide sleeve is clearance-fitted with the piston rod, with a clearance of 0.01-0.03 mm.

4. The magnetic levitation bottle-fixing assembly according to claim 1, characterized in that, Both the first protrusion and the second protrusion are detachable structures.

5. The magnetic levitation bottle-fixing assembly according to claim 1, characterized in that, The end faces of the first protrusion and the second protrusion are both arc-shaped, which fits and conforms to the wheel surface of the side abutment wheel, reducing contact wear.

6. The magnetic levitation bottle-fixing assembly according to claim 1, characterized in that, The wheel surface of the side abutment wheel is made of modified polytetrafluoroethylene.

7. The magnetic levitation bottle-fixing assembly according to claim 1, characterized in that, A pressure sensor is provided between the bottle-fixing head and the piston rod. The pressure sensor is used to collect the pressure data of the bottle-fixing head on the bottle body, and the pressure sensor is connected to the control module of the motor.

8. The magnetic levitation bottle-fixing assembly according to claim 7, characterized in that, The control module determines whether the pressure data collected by the pressure sensor exceeds the preset value range. If it exceeds the preset value, the initial rotation speed of the motor is slowed down. If it is lower than the preset value, the initial rotation speed of the motor is increased to adjust the pushing speed of the second protrusion on the side abutment wheel.

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