A quantitative cylinder convenient to disassemble

Abstract

The application relates to the technical field of fluid conveying and metering equipment, and discloses a quantitative cylinder convenient to disassemble and assemble, which comprises a cylinder body assembly, a cover plate and a piston rod; the cylinder body assembly comprises a cylinder body, a sealing assembly and a plug nut, the cylinder body is open at both ends, the first end of the cylinder body is provided with a thread, the plug nut is of a hollow structure, the plug nut is matched with the thread of the first end, and the sealing assembly is pressed against the first end; the cover plate is provided with an outlet and an inlet, the cover plate is connected with the second end, so that the outlet and the inlet are respectively communicated with the cylinder body, the inlet is connected with a first one-way valve, the conducting direction of the first one-way valve is from the outside of the cylinder body to the inside of the cylinder body, the outlet is provided with a second one-way valve, and the conducting direction of the second one-way valve is from the inside of the cylinder body to the outside of the cylinder body; the piston rod penetrates through the plug nut and the sealing assembly; due to the hollow structure of the plug nut, the plug nut can be inserted into the cylinder body for cleaning and maintenance without dismounting the sealing assembly, so that the maintenance difficulty and operation time are reduced.

Description

Technical Field

[0001] This application relates to the field of fluid transport and metering equipment technology, and in particular to a metering cylinder that is easy to disassemble and assemble. Background Technology

[0002] In the automotive industry, peristaltic pumps are typically used to deliver reinforcing agents for adhesives and sealants. The liquid volume is controlled by adjusting the motor speed. However, due to limitations in operating conditions and intensity, the peristaltic tubing is prone to fatigue, deformation, and damage, affecting the liquid volume and leading to abnormal coating quality. The peristaltic tubing usually needs to be replaced every few days.

[0003] Therefore, existing technologies use metering cylinders to supply reinforcing agents. The feeding accuracy of the metering cylinder is directly related to product safety. If scale residues form, precision parts are prone to wear during long-term operation. If maintenance is not carried out in time, it will lead to measurement errors, leakage, and the recurrence of quality defects. Moreover, the production line needs to operate continuously, so regular maintenance is essential.

[0004] However, existing metering cylinders require complete disassembly for maintenance, which is difficult and results in long maintenance times.

[0005] Therefore, how to reduce the maintenance time of the metering cylinder has become an urgent technical problem to be solved. Utility Model Content

[0006] The technical problem this application aims to solve is: how to reduce the maintenance time of the metering cylinder.

[0007] To address the aforementioned technical problems, this application provides a disassembly-friendly metering cylinder. The metering cylinder includes: a cylinder body assembly, comprising a cylinder body, a sealing assembly, and a plug nut. The cylinder body is open at both ends, with a threaded first end. The plug nut is hollow and engages with the threaded first end to press the sealing assembly against the first end; a cover plate, having an outlet and an inlet, connected to a second end, allowing the outlet and inlet to communicate with the cylinder body respectively. The inlet is connected to a first one-way valve, the first one-way valve's conduction direction being from the outside of the cylinder body to the inside of the cylinder body. The outlet is provided with a second one-way valve, the second one-way valve's conduction direction being from the inside of the cylinder body to the outside of the cylinder body; and a piston rod, passing through the plug nut and the sealing assembly, used to pump fluid from the inlet to the outlet when moving within the piston rod.

[0008] In one embodiment, the sealing assembly includes a V-ring and a copper sleeve along the direction pointing inwards from the cylinder body. The V-ring is used to isolate fluid inside the cylinder body under the compression of the plug nut, and the copper sleeve is used to limit the radial offset of the piston rod reciprocating motion.

[0009] In one embodiment, the sealing assembly includes a plurality of V-rings.

[0010] In one embodiment, the sealing assembly further includes a bearing ring and a pressure ring. Along the direction pointing inwards from the cylinder body, the plug nut sequentially presses against the bearing ring, the V-ring, the pressure ring, and the copper sleeve. The bearing ring and the pressure ring are used to maintain the structure of the V-ring.

[0011] In one embodiment, the sealing assembly further includes a sealing sleeve located near the plug nut, the sealing sleeve being used to prevent external impurities from entering the cylinder.

[0012] In one embodiment, a U-shaped ring is provided between the plug nut and the bearing ring.

[0013] In one embodiment, a gasket is provided between the U-ring and the bearing ring, the gasket being used to fill the gap between the sealing assembly and the first end.

[0014] In one embodiment, the metering cylinder further includes a servo motor, a ball screw pair, a screw housing, and a cylinder body adapter. The housing of the servo motor is sequentially connected to the screw housing, the cylinder body adapter, and the cylinder body. The servo motor is sequentially connected to the ball screw pair and the piston rod for transmission. When the servo motor rotates, it drives the piston rod to move linearly via the ball screw pair.

[0015] In one embodiment, a floating joint is provided between the ball screw assembly and the piston rod.

[0016] In one embodiment, a speed reducer is provided between the servo motor and the ball screw pair.

[0017] Compared with the prior art, the present application provides a disassembly and assembly-friendly quantitative cylinder. Its advantages are as follows: Compared with the scattered seals in the prior art, the solution of this application adopts the form of integrating the sealing component with the cylinder body into a cylinder body component. The sealing component is directly locked to the cylinder body using a plug nut. Since the plug nut is a hollow structure, the piston rod can be inserted into the cylinder body to achieve piston movement without removing the sealing component. The piston rod, sealing component and cover plate form a closed volume, which, together with the first one-way valve and the second one-way valve, achieves precise one-way pumping.

[0018] Because of the hollow structure of the plug nut, the sealing components can be cleaned and maintained by inserting the plug nut into the cylinder without removing them. If the sealing components need to be replaced, it can also be done quickly, avoiding the sealing components from being scattered all over the place and reducing the difficulty of maintenance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram illustrating the structure of a disassembly-friendly metering cylinder, as exemplarily shown in an embodiment of this application.

[0020] Figure 2 This is an exploded schematic diagram of a disassembly-friendly metering cylinder, as exemplarily shown in an embodiment of this application.

[0021] Figure 3This is an exploded view of the cylinder body assembly of a disassembled metering cylinder, as exemplarily shown in an embodiment of this application.

[0022] Figure 4 This is an example of an exploded view of a disassembled metering cylinder, as illustrated in an embodiment of this application.

[0023] Figure 5 This is an exemplary embodiment of the present application, showing an overall assembly diagram of a disassembly-friendly metering cylinder.

[0024] Figure 6 This is a cross-sectional view of an exploded schematic diagram of a sealing assembly of a metering cylinder that is easy to disassemble and assemble, as exemplarily shown in an embodiment of this application.

[0025] Figure label: 1. Measuring cylinder; 10. Cylinder body assembly; 101. Cylinder body; 102. Sealing assembly; 103. Plug nut; 1011. First end; 1012. Second end; 11. Cover plate; 111. First check valve; 112. Second check valve; 113. O-ring; 12. Piston rod; 1021. V-ring; 1022. Copper sleeve; 1023. Bearing ring; 1024. Pressure ring; 1025. Sealing sleeve; 1026. U-ring; 1027. Gasket; 13. Servo motor; 14. Ball screw pair; 15. Screw housing; 16. Cylinder body adapter; 17. Floating joint; 18. Reducer. Detailed Implementation

[0026] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0027] In the description of this application, it should be understood that the terms "first," "second," etc., in the specification, claims, and accompanying drawings are intended to distinguish similar objects and are not used to describe a specific structure. It should be understood that such terms are interchangeable where appropriate so that embodiments of this application can be implemented in structures other than those illustrated or described. Furthermore, "comprising," "having," and any variations thereof are intended to cover non-exclusive inclusion. For example, a product or device comprising a series of components or units is not necessarily limited to those explicitly listed, but may also include other components or units not explicitly listed but inherent to these products or devices.

[0028] In the assembly and production of the automotive industry, the precise supply of reinforcing agents such as adhesives and sealants is directly related to the structural strength and sealing reliability of the vehicle. At present, the industry generally uses peristaltic pumps as the core conveying equipment, and the liquid volume control is achieved by adjusting the speed of the drive motor, which can meet the flexible adjustment needs of basic material supply scenarios.

[0029] However, in actual production, the high intensity of continuous operation on the production line and the characteristics of the medium containing high viscosity and particles in the reinforcing agent will continuously squeeze and rub against the peristaltic tube of the peristaltic pump, causing the peristaltic tube to easily and rapidly experience fatigue deformation, wall wear, or even rupture. This loss directly causes fluctuations in the conveying flow rate and deviations in the material supply, which in turn leads to quality abnormalities such as uneven application of the reinforcing agent, insufficient bonding strength, or sealing failure. In severe cases, it may even affect the safety of vehicle assembly.

[0030] To address the issue of poor delivery stability in peristaltic pumps, existing technologies have adopted a metering cylinder as a reinforcing agent supply device. By leveraging the volumetric metering principle of the metering cylinder, the feeding accuracy has been significantly improved, effectively avoiding the defects caused by peristaltic tube losses.

[0031] The inventors discovered in practice that even with a metering cylinder, high maintenance requirements remain. The particulate filler and high viscosity of the reinforcing agent make it prone to residue buildup in the cylinder cavity, seals, and valve gaps during long-term transport, forming scale and accelerating the wear and tear of precision components. Furthermore, the piston-cylinder clearance fit and sealing rings, among other core structures of the metering cylinder, inevitably face aging and wear during high-pressure reciprocating motion. Without timely maintenance, problems such as increased metering errors and media leakage will quickly arise, recurring the quality risks associated with peristaltic pump solutions.

[0032] Meanwhile, the continuous operation of automobile production lines requires equipment to work reliably and continuously. Failure to maintain the metering cylinder and subsequent shutdown will result in economic losses far exceeding those of routine maintenance. Therefore, regular maintenance is a necessary prerequisite for maintaining the precise feeding advantage of the metering cylinder.

[0033] However, the existing quantitative cylinder has obvious shortcomings in its structural design. Most of its components are integrally rigidly connected. During maintenance, the core components such as the cylinder body, piston, sealing components, and transmission mechanism need to be completely disassembled. This not only makes the disassembly and assembly process cumbersome and requires high skills from operators, but also makes each maintenance operation time-consuming, which seriously affects the continuous operation efficiency of the production line.

[0034] Based on this, the inventors specifically optimized the structural design of the metering cylinder 1, such as... Figure 1 and Figure 2 As shown in the preferred embodiment of this application, a metering cylinder 1 that is easy to assemble and disassemble is provided. The metering cylinder 1 includes a cylinder body assembly 10, a cover plate 11, and a piston rod 12.

[0035] The cylinder assembly 10 includes a cylinder 101, a sealing assembly 102, and a plug nut 103. The cylinder 101 is open at both ends. The first end 1011 of the cylinder 101 is threaded. The plug nut 103 is hollow and is threaded to the first end 1011 to press the sealing assembly 102 to the first end 1011.

[0036] The cover plate 11 is provided with an outlet and an inlet. The cover plate 11 is connected to the second end 1012, so that the outlet and the inlet are respectively connected to the cylinder body 101. The inlet is connected to a first one-way valve 111. The conduction direction of the first one-way valve 111 is from the outside of the cylinder body 101 to the inside of the cylinder body 101. The outlet is provided with a second one-way valve 112. The conduction direction of the second one-way valve 112 is from the inside of the cylinder body 101 to the outside of the cylinder body 101.

[0037] The piston rod 12 passes through the plug nut 103 and the sealing assembly 102. The piston rod 12 is used to pump fluid from the inlet to the outlet as it moves within the piston rod 12.

[0038] Compared with the scattered seals in the prior art, the solution of this application adopts the form of integrating the sealing component 102 with the cylinder body 101 into the cylinder body component 10. The sealing component 102 is directly locked to the cylinder body 101 using the plug nut 103. Since the plug nut 103 is a hollow structure, the piston rod 12 can be inserted into the cylinder body 101 to realize piston movement without removing the sealing component 102. The piston rod 12, the sealing component 102 and the cover plate 11 form a closed volume, which, together with the first one-way valve 111 and the second one-way valve 112, realizes precise one-way pumping.

[0039] Due to the hollow structure of the plug nut 103, the cylinder body 101 can be cleaned and maintained without removing the sealing component 102. If the sealing component 102 needs to be replaced, it can also be done quickly, avoiding the sealing component 102 from being scattered all over the ground and reducing the difficulty of maintenance.

[0040] It is understood that the metering cylinder 1 of this application reduces the difficulty of maintenance through the innovative structure of the cylinder body 101 and the installation structure of the sealing component 102. It is not directly related to the specific form of the internal fluid. Therefore, the metering cylinder 1 of this application is applicable to any application scenario in which the metering cylinder 1 can be used. This application does not limit it. When applied to different scenarios, it also falls within the protection scope of this application.

[0041] In one embodiment, such as Figure 3 As shown, along the direction pointing inwards from the cylinder body 101, the sealing assembly 102 includes a V-ring 1021 and a copper sleeve 1022. The V-ring 1021 is used to isolate the fluid inside the cylinder body 101 under the compression of the plug nut 103, and the copper sleeve 1022 is used to limit the radial displacement of the reciprocating motion of the piston rod 12.

[0042] The V-ring 1021 forms a reliable seal under the compression of the plug nut 103, which can effectively isolate the high viscosity particulate reinforcing agent in the cylinder 101, prevent the medium from leaking from the gap between the piston rod 12 and the cylinder 101, and ensure the accuracy and stability of the quantitative feeding.

[0043] The copper sleeve 1022 ensures the coaxiality of the piston rod 12's movement by limiting the radial offset during the reciprocating motion of the piston rod 12, reducing the squeezing and wear of the seal due to eccentric motion, extending the service life of the sealing assembly 102, reducing the maintenance cost of frequent component replacement, and adapting to the high-intensity requirements of continuous operation in the automotive production line.

[0044] The combination of the two structures ensures both a good seal and enhances the overall reliability of the equipment through guiding protection.

[0045] In a further embodiment, such as Figure 3 As shown, the sealing assembly 102 includes a plurality of V-rings 1021. The arrangement of multiple sets of V-rings 1021 can form multiple sealing protections, making full use of the pressure self-tightening characteristics of the V-rings 1021. As the feeding pressure inside the cylinder 101 increases, the sealing lip of each set of V-rings 1021 will fit more tightly against the sealing surface, greatly improving the sealing reliability.

[0046] In this application, as Figure 3 As shown, the sealing assembly 102 may also include a bearing ring 1023 and a pressure ring 1024. Along the direction pointing towards the inside of the cylinder body 101, the plug nut 103 sequentially presses the bearing ring 1023, the V-ring 1021, the pressure ring 1024, and the copper sleeve 1022. The bearing ring 1023 and the pressure ring 1024 are used to maintain the structure of the V-ring 1021.

[0047] The addition of the bearing ring 1023 and the pressure ring 1024 provides stable structural support for the V-ring 1021. Under the sequential compression of the plug nut 103, the three work together with the copper sleeve 1022 to effectively limit the deformation and displacement of the V-ring 1021 under the reciprocating motion of the piston rod 12 and high pressure conditions, and prevent the sealing lip from failing due to structural instability.

[0048] The components are less likely to fall apart during disassembly and assembly, simplifying the maintenance process and further shortening maintenance time.

[0049] In one embodiment, such as Figure 3 As shown, the sealing assembly 102 also includes a sealing sleeve 1025, which is located near the plug nut 103 and is used to prevent external impurities from entering the cylinder body 101.

[0050] The sealing sleeve 1025 is positioned close to the plug nut 103, effectively preventing external impurities such as dust and oil from the automotive production site from entering the cylinder block 101 and avoiding impurities adhering to the surface of the piston rod 12 or intruding into the gap of the sealing assembly 102. This not only reduces wear but also maintains the stability of sealing performance and motion accuracy, extending the service life of the metering cylinder 1.

[0051] At the same time, the isolation of impurities also reduces the probability of downtime due to contamination, reduces the amount of cleaning work during maintenance, and further shortens the maintenance time.

[0052] In one embodiment, such as Figure 3 As shown, a U-ring 1026 is provided between the plug nut 103 and the bearing ring 1023. The U-ring 1026, positioned between the plug nut 103 and the bearing ring 1023, forms a supplementary end-face seal, creating a dual-protection system with the radial seal of the V-ring 1021. The elastic recovery property of the U-ring 1026 can also compensate for minor gaps during assembly, reduce loosening of the sealing surface caused by vibration, ensure the durability of the sealing effect, and reduce the risk of leakage.

[0053] In one embodiment, such as Figure 3 As shown, a gasket 1027 is provided between the U-ring 1026 and the bearing ring 1023. The gasket 1027 is used to fill the gap between the sealing assembly 102 and the first end 1011.

[0054] The gasket 1027 is positioned between the U-ring 1026 and the bearing ring 1023, precisely filling the minute gap between the sealing assembly 102 and the first end 1011 of the cylinder 101. This prevents gaps from forming at the component mating surfaces due to rigid contact, thereby further improving the tightness of the seal and preventing media leakage. Simultaneously, the cushioning effect of the gasket 1027 absorbs assembly errors and minor vibrations during equipment operation, reducing impact damage to the seals and extending the service life of the sealing assembly 102. Furthermore, the gasket 1027 has a simple structure and can be quickly disassembled and replaced for maintenance without complex operations. This ensures a good seal after repeated assembly, simplifies the maintenance process, reduces maintenance difficulty, and allows for gasket 1027 replacement without the need for professional personnel, improving the convenience of equipment maintenance.

[0055] Exemplary cross-sectional structures of U-ring 1026, V-ring 1021, sealing sleeve 1025, and gasket 1027 are as follows: Figure 6 As shown.

[0056] In one embodiment, such as Figure 4 and Figure 5 As shown, the quantitative cylinder 1 also includes a servo motor 13, a ball screw pair 14, a screw housing 15, and a cylinder body adapter 16. The housing of the servo motor 13 is connected in sequence to the screw housing 15, the cylinder body adapter 16, and the cylinder body 101. The servo motor 13 is connected in sequence to the ball screw pair 14 and the piston rod 12. When the servo motor 13 rotates, it pushes the piston rod 12 to move linearly via the ball screw pair 14.

[0057] The servo motor 13, ball screw assembly 14, and cylinder body 101 are modularly connected via the screw housing 15 and cylinder body adapter 16. This results in a compact and well-organized overall structure, ensuring stable power transmission while simplifying the assembly process. The transmission cooperation between the servo motor 13 and ball screw assembly 14 enables high-precision motion control, driving the piston rod 12 in smooth linear motion. This ensures the volumetric metering accuracy of the metering cylinder 1, meeting the precise feeding requirements of automotive reinforcing agents. The modular connection method facilitates the disassembly and assembly of components. During maintenance, only the parts requiring maintenance can be disassembled, eliminating the need to disassemble the entire equipment and significantly shortening maintenance time. In a further embodiment, such as Figure 4 and Figure 5 As shown, a floating joint 17 is provided between the ball screw assembly 14 and the piston rod 12.

[0058] The floating joint 17 effectively solves the problem of coaxiality deviation in the assembly of the servo motor 13, the ball screw assembly 14, and the piston rod 12. It can absorb minute angular offsets and radial displacements during motion, ensuring smooth power transmission and preventing transmission jamming or uneven force distribution. Simultaneously, it can buffer the impact force during the reciprocating motion of the piston rod 12, reducing wear on the ball screw assembly 14 and piston rod 12 due to off-center loads, extending the service life of core transmission components, and reducing long-term maintenance costs. Furthermore, the floating joint 17 simplifies coaxiality calibration requirements during assembly, reduces operational difficulty, and allows for quick separation of the ball screw assembly 14 and piston rod 12 during maintenance, facilitating individual maintenance of each component and further improving the ease of equipment maintenance, thus meeting the needs of efficient maintenance on the production line.

[0059] In one embodiment, a reducer 18 is provided between the servo motor 13 and the ball screw pair 14. The reducer 18 is located between the servo motor 13 and the ball screw pair 14, which can effectively amplify the output torque of the servo motor 13, provide sufficient power for the linear movement of the piston rod 12, and is especially suitable for the high pressure load requirements when conveying high viscosity reinforcing agents, ensuring that the metering cylinder 1 can smoothly complete the suction and discharge actions under various working conditions.

[0060] Meanwhile, the reduction effect of the reducer 18 can improve the precision of motion control, making the displacement adjustment of the piston rod 12 more accurate, further ensuring the accuracy of quantitative feeding and meeting the strict requirements of automotive assembly for the amount of reinforcing agent applied. In addition, the reducer 18 can also reduce the operating load of the servo motor 13, reduce motor losses, extend motor life, reduce long-term maintenance costs of the equipment, adapt to the continuous and stable operation requirements of the automotive production line, and reduce downtime caused by motor failure.

[0061] In one embodiment of this application, as Figure 2As shown, an O-ring 113 can also be provided between the cover plate 11 and the cylinder body 101 for sealing between the cover plate 11 and the cylinder body 101.

[0062] The embodiments of this application focus on the structural optimization of the metering cylinder 1, reducing maintenance time by optimizing the assembly logic. Regarding the sealing system, different combinations of V-rings, copper sleeves 1022, bearing rings 1023, pressure rings 1024, sealing sleeves 1025, U-rings, and gaskets 1027 are used to form a layered sealing and support structure along the internal direction of the cylinder body 101, achieving media isolation, radial guidance, and impurity protection.

[0063] In terms of the power transmission system, a servo motor 13 and a ball screw pair 14 are used as the core drive units. The modular connection is achieved through the screw housing 15 and the cylinder adapter 16. The floating joint 17 is used to compensate for assembly deviations. A reducer 18 is added to improve torque and control accuracy. A complete transmission chain from motor power output to the linear motion of piston rod 12 is constructed, and the sealing, guiding, power transmission and protection performance of the quantitative cylinder 1 are optimized.

[0064] In summary, the embodiments of this application provide a disassembly and assembly-friendly quantitative cylinder 1. The various embodiments achieve synergistic advantages through structural optimization, which not only enhances sealing reliability, with multiple sealing and protection designs effectively preventing media leakage and impurity intrusion, ensuring feeding accuracy, but also improves motion stability, with precise transmission and guiding structures reducing component wear and extending equipment life.

[0065] Meanwhile, the modular layout and adaptable design simplify the assembly and maintenance process, shorten maintenance time, reduce the difficulty of operation, adapt to the needs of conveying high-viscosity media containing particles and continuous operation of production lines, and achieve the unity of precise material supply, stable operation and efficient maintenance.

[0066] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

Claims

1. A dispensing cylinder that is easy to assemble and disassemble, characterized in that, The metering cylinder (1) includes: The cylinder assembly (10) includes a cylinder body (101), a sealing assembly (102), and a plug nut (103). The cylinder body (101) is open at both ends. The first end (1011) of the cylinder body (101) is threaded. The plug nut (103) is hollow and is threaded to the first end (1011) to press the sealing assembly (102) against the first end (1011). A cover plate (11) is provided with an outlet and an inlet. The cover plate (11) is connected to a second end (1012) so that the outlet and the inlet are respectively connected to the cylinder body (101). The inlet is connected to a first one-way valve (111). The conduction direction of the first one-way valve (111) is from the outside of the cylinder body (101) to the inside of the cylinder body (101). The outlet is provided with a second one-way valve (112). The conduction direction of the second one-way valve (112) is from the inside of the cylinder body (101) to the outside of the cylinder body (101). A piston rod (12) passes through the plug nut (103) and the sealing assembly (102), the piston rod (12) being used to pump fluid from the inlet to the outlet as it moves within the piston rod (12).

2. The metering cylinder (1) according to claim 1, characterized in that, Along the direction pointing inward of the cylinder (101), the sealing assembly (102) includes a V-ring (1021) and a copper sleeve (1022), the V-ring (1021) being used to isolate fluid within the cylinder (101) under the compression of the plug nut (103), and the copper sleeve (1022) being used to limit the radial offset of the reciprocating motion of the piston rod (12).

3. The metering cylinder according to claim 2, characterized in that, The sealing assembly (102) includes a plurality of the V-rings (1021).

4. The metering cylinder according to claim 2, characterized in that, The sealing assembly (102) also includes a bearing ring (1023) and a pressure ring (1024). Along the direction pointing inward to the inside of the cylinder (101), the plug nut (103) sequentially presses the bearing ring (1023), the V-ring (1021), the pressure ring (1024), and the copper sleeve (1022). The bearing ring (1023) and the pressure ring (1024) are used to maintain the structure of the V-ring (1021).

5. The metering cylinder according to claim 4, characterized in that, The sealing assembly (102) also includes a sealing sleeve (1025) located near the plug nut (103) and used to prevent external impurities from entering the cylinder (101).

6. The metering cylinder according to claim 4, characterized in that, A U-shaped ring (1026) is provided between the plug nut (103) and the bearing ring (1023).

7. The metering cylinder according to claim 6, characterized in that, A gasket (1027) is provided between the U-ring (1026) and the bearing ring (1023), and the gasket (1027) is used to fill the gap between the sealing assembly (102) and the first end (1011).

8. The metering cylinder according to claim 1, characterized in that, The quantitative cylinder (1) also includes a servo motor (13), a ball screw pair (14), a screw housing (15), and a cylinder body adapter (16). The housing of the servo motor (13) is connected in sequence to the screw housing (15), the cylinder body adapter (16), and the cylinder body (101). The servo motor (13) is connected in sequence to the ball screw pair (14) and the piston rod (12). When the servo motor (13) rotates, it pushes the piston rod (12) to move linearly via the ball screw pair (14).

9. The metering cylinder according to claim 8, characterized in that, A floating joint (17) is provided between the ball screw pair (14) and the piston rod (12).

10. The metering cylinder according to claim 8, characterized in that, A speed reducer (18) is provided between the servo motor (13) and the ball screw pair (14).

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