Gluing disc and design method thereof

Abstract

The invention relates to a gluing disc and a design method thereof, and belongs to the technical field of lithium battery tab gluing, the gluing disc comprises a gluing part and a fastening part, the fastening part is of an annular structure and sleeves a roller shaft, the fastening part is provided with a fin assembly, the fin assembly comprises a plurality of arc-shaped fins arranged on the periphery of the roller shaft in the circumferential direction, and the arc-shaped fins are arranged on the periphery of the roller shaft in the circumferential direction. The fastening sleeve is arranged on the periphery of the fin assembly in a sleeving mode, the gluing disc is of a mechanical enclasping structure, and the gluing disc is matched with the fastening sleeve through the arc-shaped fins, so that the rapid enclasping and loosening functions of the gluing disc on the roller shaft are achieved. The design method comprises the steps of determining the inner diameter of the fin assembly, determining the circumferential enclasping stress of the fin assembly, determining the length-thickness ratio k of the arc-shaped fin, verifying and optimizing parameters and testing assembly, it is ensured that the performance of the gluing disc is optimal under different working conditions through parameter verification and optimization, the adaptability and reliability of equipment are improved, and the production cost is reduced. The design of the gluing disc can adapt to roller shafts of different specifications and gluing requirements, and the gluing disc has wide universality and interchangeability.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery tab gluing, and more particularly, to a gluing disc and a design method thereof. Background Art

[0002] In the field of lithium battery tab gluing, intermittent gluing treatment is a key technology. However, the existing intermittent gluing treatment technology usually realizes the adjustable effect of the gluing gap by setting a spacer sleeve on the gluing roller. When different specifications of gluing coating are required, the entire gluing roller needs to be removed first, then the spacer sleeve is disassembled and replaced from the gluing roller, and finally the distance between the gluing discs is readjusted. This operation is not only time-consuming but also cumbersome and complex, seriously affecting production efficiency.

[0003] To address this problem, Chinese Patent CN221847647U discloses a gluing roller with adjustable gap. Its core design includes a roller shaft, a gluing disc, and a blowing mechanism. The gluing disc is sleeved on the roller shaft, and the blowing mechanism blows air to the gluing disc through the air outlet to form a gap between the gluing disc and the roller shaft, thereby realizing the free movement and spacing adjustment of the gluing disc. The spacing adjustment of the gluing disc mainly depends on the blowing mechanism. Although this design solves the problem of portable adjustment of the gluing disc spacing to a certain extent, it has high requirements for the working environment. If the gas supply of the blowing mechanism is unstable or interrupted, the gluing disc cannot move or be fixed smoothly, resulting in adjustment failure; in addition, the ball and the housing of the one-way valve are prone to wear during long-term use, which may cause gas leakage or functional failure; secondly, the fixing force of the gluing disc depends on the elastic action of the elastic layer. However, the performance of the elastic layer gradually decreases with the increase of use time and frequency, resulting in the gluing disc not being firmly fixed on the roller shaft after long-term use, and the one-way valve and the elastic layer need to be frequently replaced, increasing the maintenance difficulty and frequency of the equipment.

[0004] Therefore, it is necessary to provide a gluing disc and a design method thereof that do not rely on external gas supply, have a simple structure, and are easy to maintain to solve the above technical problems. Summary of the Invention

[0005] The object of the present invention is to provide a gluing disc and a design method thereof to solve the above technical problems.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A glue - applying disc is sleeved on a roller shaft and includes a main body and a fastening sleeve. The main body includes an integrally - formed glue - applying part and a fastening part. The glue - applying part protrudes relative to the fastening part, and the outer diameter of the glue - applying part is larger than that of the fastening part. The fastening part is in a ring - shaped structure and is sleeved on the roller shaft. The fastening part is provided with a fin assembly along the axial direction of the roller shaft. The fin assembly includes a plurality of arc - shaped fins arranged circumferentially on the outer periphery of the roller shaft, and there is a gap between adjacent arc - shaped fins. The fastening sleeve is sleeved on the outer periphery of the fin assembly, and the inner wall shape of the fastening sleeve is adapted to the outer wall shape of the fin assembly.

[0008] As a preferred technical solution of the present invention, the arc - shaped fin includes a fin tip at the free end and a fin root at the fixed end. The fin root is fixedly arranged on the fastening part, the thickness from the fin root to the fin tip gradually decreases, and the cross - section of the arc - shaped fin is a right - angled triangle. The fin assembly is in a conical - cylinder structure, and the inner wall of the fastening sleeve is in a conical surface structure to adapt to the outer wall shape of the fin assembly.

[0009] As a preferred technical solution of the present invention, the inner diameter of the fastening sleeve is larger than the outer diameter of the fin assembly. A plurality of through - holes are circumferentially arranged on the fastening sleeve, and fastening rods are inserted into the through - holes. The fastening rods are used to drive the fastening sleeve to contract, thereby driving the fin assembly to tightly hold the roller shaft.

[0010] As a preferred technical solution of the present invention, the inner diameter of the fastening sleeve is smaller than the outer diameter of the fin assembly. The fastening sleeve is in interference fit with the fin assembly, thereby driving the fin assembly to contract and tightly hold the roller shaft.

[0011] As a preferred technical solution of the present invention, there are multiple glue - applying discs, and the multiple glue - applying discs are arranged at intervals.

[0012] As a preferred technical solution of the present invention, the fin assembly is made of spring steel material, and the surface roughness Ra≤1.6μm.

[0013] A design method of a glue - applying disc of the present invention includes the following steps:

[0014] S1. Determine the inner diameter of the fin assembly: The inner diameter D of the fin assembly is determined by the coefficient of thermal expansion and the assembly tolerance, and satisfies the following relationship:

[0015] D = D 1 +2Δ + δ

[0016] In the formula, D is the inner diameter of the fin assembly, in mm; D 1 is the outer diameter of the roller shaft, in mm; Δ is the assembly gap, in mm; δ is the assembly tolerance, in mm;

[0017] Among them, the assembly gap △ needs to meet the thermal expansion requirements and satisfy the following relationship:

[0018] Δ≥α(T max -T 0 )D 1

[0019] In the formula, α is the linear expansion coefficient of the material of the fin assembly, with the unit of 1 / °C; T max is the highest working temperature, with the unit of °C; T 0 is the assembly temperature, with the unit of °C;

[0020] S2. Determine the circumferential clamping stress of the fin assembly: The glue - applying disc is sleeved on the roller shaft. When the roller shaft rotates, the glue - applying part contacts the coating, and the gluing process is completed through friction. The friction between the glue - applying part and the coating generates a braking friction torque, which will drive the glue - applying disc to rotate around the roller shaft. To keep the glue - applying disc and the roller shaft in a relatively stationary state, the fastening sleeve is sleeved on the fin assembly and radial pressure is applied to the fin assembly for fastening, driving the fin assembly to radially contract and clamp the roller shaft, generating a clamping friction torque to resist the braking friction torque T 2 , and the clamping friction torque T 1 satisfies the following relationship:

[0021]

[0022] (It is assumed that the fin assembly is uniformly stressed)

[0023] In the formula, T 1 is the clamping friction torque, T 2 is the braking friction torque, F 1 is the total circumferential clamping pressure of the fastening sleeve on the fin assembly, with the unit of N; F 2 is the normal pressure of the coating on the glue - applying part, determined by the coating tension, with the unit of N; n is the safety factor, dimensionless; μ 1 is the static friction coefficient between the fin assembly and the roller shaft, dimensionless; μ 2 is the static friction coefficient between the coating and the glue - applying part, dimensionless; q is the circumferential clamping stress, with the unit of N / mm 2 ; L is the length of the fin assembly, with the unit of mm; D 2 is the outer diameter of the glue - applying part, with the unit of mm;

[0024] S3. Determine the length - thickness ratio k of the arc - shaped fin: The length - thickness ratio k is the ratio of the length L of the arc - shaped fin to the fin - root thickness t of the arc - shaped fin. The length - thickness ratio k is determined by the material yield strength of the fin assembly and satisfies the following relationship:

[0025]

[0026] In the formula, t is the fin - root thickness, with the unit of mm; q is the circumferential clamping stress, with the unit of N / mm 2 ; L is the length of the fin assembly, with the unit of mm; σ is the yield strength of the arc - shaped fin, with the unit of N / mm 2 ;

[0027] S4. Parameter verification and optimization: Based on the value range of the length - thickness ratio k of the arc - shaped fin determined in step S3, select a reasonable initial length L and thickness t, establish the geometric model of the glue - applying disk, set the boundary conditions and loading conditions, and through finite - element simulation analysis, calculate the stress distribution, buckling behavior, and thermal expansion effect of the arc - shaped fin under different numerical values of length L and thickness t. According to the simulation analysis results, gradually adjust the numerical values of the length L and thickness t of the arc - shaped fin until the optimal design goal is achieved;

[0028] S5. Assembly test: Conduct the assembly and actual test of the glue - applying disk to verify whether the clamping frictional torque meets the design requirements.

[0029] As a preferred technical solution of the present invention, the ratio of the length L of the arc - shaped fin to the fin - root thickness t of the arc - shaped fin in step S3 is also determined by buckling stability and satisfies the following relationship:

[0030]

[0031] In the formula, E is the elastic modulus of the arc - shaped fin, with the unit of Pa; b is the arc width of a single arc - shaped fin, with the unit of mm; n' is the safety factor, dimensionless; F' is the critical buckling load of the arc - shaped fin, that is, the minimum axial pressure leading to instability, with the unit of N.

[0032] As a preferred technical solution of the present invention, the finite - element simulation analysis in step S4 includes the non - linear analysis of the tapered contact surface between the arc - shaped fin and the fastening sleeve, the fatigue strength check under cyclic loads, and focuses on the stress concentration factor at the connection between the fin root and the fastening part.

[0033] As a preferred technical solution of the present invention, the actual test of the glue - applying disk in step S5 is to apply 1.2 times the rated torque to the gluing part, test whether there is relative slip between the glue - applying disk and the roller shaft, record the residual deformation ε after unloading, and require that the residual deformation ε < 0.05 mm.

[0034] In summary, compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] The glue - applying disc of the present invention adopts a mechanical clamping structure. Through the precise cooperation of the arc - shaped fins with a taper and the fastening sleeve with a frustum - cone structure, the functions of quickly clamping and loosening the glue - applying disc on the roller shaft are realized. It completely eliminates the dependence on the complex and malfunction - prone external gas supply system, greatly reduces the requirements for the working environment, and significantly improves the environmental adaptability and operation stability of the equipment. In terms of adjustment efficiency, the present invention can complete the precise adjustment of the distance between the glue - applying discs through simple mechanical operations, without the cumbersome gas supply and pressure adjustment steps, greatly shortening the operation time and better meeting the needs of automated production; in terms of fixing reliability, the present invention abandons the elastic - layer structure that is prone to failure due to long - term use in the traditional technology and instead adopts a pure - mechanical clamping method. It not only provides a uniform and strong circumferential clamping force to ensure the position stability of the glue - applying disc during high - speed rotation and frequent adjustment, but also completely eliminates the problem of the attenuation of the fixing force caused by elastic fatigue. Even in a long - term, high - intensity continuous production environment, the glue - applying disc of the present invention can still maintain its initial stability, effectively ensuring the consistency of the glue - applying accuracy and product quality; in addition, due to the removal of the vulnerable one - way valve and elastic - layer components, the daily maintenance work of the equipment is greatly simplified, only requiring regular inspection of the wear of mechanical components, significantly reducing the maintenance cost and equipment downtime, bringing long - term economic benefits and operation convenience to users.

[0036] The present invention simplifies the arc - shaped fins into a cantilever - beam model. Through double - checking of strength and stability, it ensures that the stress at the root of the fin does not exceed the yield strength of the material, avoiding plastic deformation or fracture caused by local stress concentration, and effectively preventing the fins from buckling under compression, thus improving the structural robustness; under the constraints of yield strength and buckling stability, the optimal ratio of the fin length to the thickness is found, minimizing the material usage while ensuring the bearing capacity and achieving lightweight. Through multi - disciplinary coupling analysis, combining the theories and methods of thermodynamics, solid mechanics, and materials science, the design of the glue - applying disc is comprehensively optimized, effectively reducing the number and cost of actual tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the installation of the glue - applying disc and the roller shaft of the present invention;

[0038] Figure 2 It is a schematic diagram of the main body of the present invention;

[0039] Figure 3 It is a schematic diagram of the fastening sleeve of the present invention;

[0040] Figure 4 It is a schematic diagram of the glue - applying disc of the present invention;

[0041] Figure 5 Cross-sectional view of the glue application disk of the present invention;

[0042] Figure 6 Cross-sectional view of the main body of the present invention;

[0043] Figure 7 Flow chart of the design method of the glue application disk of the present invention;

[0044] Wherein, 1 - glue application disk, 11 - main body, 111 - glue application part, 112 - fastening part, 113 - fin assembly, 114 - arc fin, 1141 - fin tip, 1142 - fin root, 12 - fastening sleeve, 121 - through hole, 122 - fastening rod, 2 - roller shaft. Detailed implementation manners

[0045] The following will describe in detail the specific embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments given here are only for illustrating and explaining the present invention and cannot be used to limit the present invention.

[0046] As Figures 1 to 6 shown, a glue application disk 1 of the present invention is sleeved on a roller shaft 2 and includes a main body 11 and a fastening sleeve 12. The main body 11 includes an integrally formed glue application part 111 and a fastening part 112. The glue application part 111 protrudes relative to the fastening part 112, and the outer diameter of the glue application part 111 is greater than that of the fastening part 112. The fastening part 112 is in a ring structure and is sleeved on the roller shaft 2. The fastening part 112 is provided with a fin assembly 113 along the axial direction of the roller shaft 2. The fin assembly 113 includes a plurality of arc fins 114 arranged circumferentially on the outer periphery of the roller shaft 2, and there is a gap between adjacent arc fins 114; the fastening sleeve 12 is sleeved on the outer periphery of the fin assembly 113, and the inner wall shape of the fastening sleeve 12 is adapted to the outer wall shape of the fin assembly 113.

[0047] Through the ingenious cooperation of the tapered arc fins 114 and the fixed sleeve with a frustum structure in the present invention, the functions of quickly clamping and loosening the glue application disk 1 on the roller shaft 2 are realized, completely eliminating the dependence on a complex and prone-to-failure external gas supply system, greatly reducing the requirements for the working environment, and significantly improving the environmental adaptability and operation stability of the equipment. At the same time, the mechanical clamping structure of the present invention can quickly adapt to different glue application requirements, increasing the flexibility and adaptability of the equipment. The fin assembly 113 is arranged circumferentially on the outer periphery of the roller shaft 2, and there is a gap between adjacent fins, allowing the arc fins 114 to have a certain deformation space when the fastening sleeve 12 applies a radial pressure to the fin assembly 113, so as to provide a better clamping effect during the fastening process and enhance the stability of the structure. Secondly, the gap allows the arc fins 114 to absorb and disperse vibrations to a certain extent during the glue application process, reducing the vibrations and noises of the equipment during operation.

[0048] As a preferred embodiment of the present invention, the arc-shaped fin 114 includes a fin tip 1141 at the free end and a fin root 1142 at the fixed end. The fin root 1142 is fixedly arranged on the fastening part 112. The thickness from the fin root 1142 to the fin tip 1141 gradually decreases, and the cross-section of the arc-shaped fin 114 is a right triangle. The fin assembly 113 has a conical tube structure, and the inner wall of the fastening sleeve 12 has a conical surface structure to adapt to the outer wall shape of the fin assembly 113.

[0049] In the first embodiment, the inner diameter of the fastening sleeve 12 is larger than the outer diameter of the fin assembly 113. A plurality of through holes 121 are circumferentially provided on the fastening sleeve 12, and fastening rods 122 are inserted into the through holes 121. The fastening rods 122 are used to drive the fastening sleeve 12 to contract, thereby driving the fin assembly 113 to tightly hold the roller shaft 2.

[0050] By rotating or pushing the fastening rods 122, the fastening sleeve 12 can generate a radial contraction force, thereby ensuring that the fin assembly 113 is tightly combined with the roller shaft 2, avoiding loosening during the working process. Adjusting with the fastening rods 122 makes the assembly and disassembly more convenient and fast.

[0051] In the second embodiment, the inner diameter of the fastening sleeve 12 is smaller than the outer diameter of the fin assembly 113. The fastening sleeve 12 is in interference fit with the fin assembly 113, thereby driving the fin assembly 113 to contract and tightly hold the roller shaft 2.

[0052] Since the inner diameter of the fastening sleeve 12 is smaller than the outer diameter of the fin assembly 113, by means of interference fit, a frictional force can be generated between the fastening sleeve 12 and the fin assembly 113 by applying a certain pressure, thereby ensuring that the fin assembly 113 is fastened on the roller shaft 2. Without the need for fastening rods 122 or other additional tools, the fastening action can be completed relying on the mechanical fit force. The stable contact force provided by the interference fit makes the glue application tray 1 not easy to loosen during long-term use.

[0053] As a preferred embodiment of the present invention, there are multiple glue application trays 1, and the multiple glue application trays 1 are arranged at intervals.

[0054] By the multiple glue application trays 1 arranged at intervals, it is convenient to adjust the glue application spacing and the connection is reliable. The position of the glue application trays 1 can be flexibly adjusted according to different glue application requirements without a complex disassembly and reinstallation process, adapting to various production tasks, reducing the equipment downtime, and improving the overall production efficiency.

[0055] As a preferred embodiment of the present invention, the fin assembly 113 is made of spring steel, and the surface roughness Ra ≤ 1.6 μm.

[0056] As Figure 7 shown, a design method of a glue application tray 1 of the present invention includes the following steps:

[0057] S1. Determine the inner diameter of the fin assembly 113: The inner diameter D of the fin assembly 113 is determined by the coefficient of thermal expansion and the assembly tolerance, and satisfies the following relationship:

[0058] D = D 1 + 2Δ + δ

[0059] In the formula, D is the inner diameter of the fin assembly 113, with the unit of mm; D 1 is the outer diameter of the roller shaft 2, with the unit of mm; Δ is the assembly gap, with the unit of mm; δ is the assembly tolerance, with the unit of mm;

[0060] Among them, the assembly gap △ needs to meet the thermal expansion requirements and satisfies the following relationship:

[0061] Δ ≥ α(T max - T 0 )D 1

[0062] In the formula, α is the linear expansion coefficient of the material of the fin assembly 113, with the unit of 1 / °C; T max is the highest working temperature, with the unit of °C; T 0 is the assembly temperature, with the unit of °C;

[0063] Thermal expansion will cause the diameter D of the roller shaft 2 1 to increase. If no gap Δ is reserved, the fin assembly 113 and the roller shaft 2 may be stuck at high temperatures. Therefore, the inner diameter D of the fin assembly 113 needs to cover the maximum expansion amount to avoid getting stuck at high temperatures; the minimum assembly gap is calculated through the linear expansion formula, and the assembly tolerance compensation amount is superimposed to finally determine the inner diameter D of the fin assembly 113, fundamentally solving the thermo-mechanical coupling problem and ensuring the operation stability in a wide temperature range.

[0064] S2. Determine the circumferential clamping stress of the fin assembly 113: The glue application disk 1 is sleeved on the roller shaft 2. When the roller shaft 2 rotates, the glue application part 111 contacts the coating, and the glue application is completed through friction. The friction between the glue application part 111 and the coating generates a braking friction torque, and the braking friction torque will drive the glue application disk 1 to rotate around the roller shaft 2. To keep the glue application disk 1 and the roller shaft 2 relatively stationary stably, the fastening sleeve 12 is sleeved on the fin assembly 113 and a radial pressure is applied to the fin assembly 113 for fastening, driving the fin assembly 113 to radially contract and clamp the roller shaft 2, generating a clamping friction torque to resist the braking friction torque T 2 , and the clamping friction torque T 1 satisfies the following relationship:

[0065]

[0066] (It is assumed that the fin assembly is uniformly stressed)

[0067] In the formula, T1 is the holding friction torque, T 2 Braking friction torque, F 1 F is the total circumferential clamping pressure of the fastening sleeve 12 on the fin assembly 113, in N; 2 is the normal pressure of the coating on the coating part 111, which is determined by the coating tension force and the unit is N; n is the safety factor, dimensionless; μ 1 is the static friction coefficient between the fin assembly 113 and the roller 2, dimensionless; μ 2 is the static friction coefficient between the coating and the glue coating part 111, dimensionless; q is the hoop clamping stress, unit is N / mm 2 ; L is the length of the fin assembly 113, in mm; D 2 is the outer diameter of the glue coating portion 111, in mm;

[0068] By accurately calculating the clamping friction torque and the braking friction torque, a stable connection between the glue coating disc 1 and the roller 2 is ensured to prevent slippage due to insufficient friction. A safety factor is introduced to ensure that the design has sufficient safety margin to adapt to different working conditions and load changes.

[0069] S3. Determine the length-to-thickness ratio k of the arcuate fin 114: The length-to-thickness ratio k is the ratio of the length L of the arcuate fin 114 to the thickness t of the wing root 1142 of the arcuate fin 114. The length-to-thickness ratio k is determined by the yield strength of the material of the fin assembly 113 and satisfies the following relationship:

[0070]

[0071] Where, t is the wing root 1142 thickness, unit is mm; q is the hoop clamping stress, unit is N / mm 2 ; L is the length of the fin assembly 113, in mm; σ is the yield strength of the arc fin 114, in N / mm 2 ;

[0072] The principle of the length-to-thickness ratio k formula determined based on the material yield strength is that the bending stress at the 1142 part of the wing root does not exceed the material yield strength. The derivation process is as follows:

[0073] The fin assembly 113 is a cantilever beam structure, and the bending moment M = bqL borne by the fin root 1142 2 / 2, b is the arc width of a single arc fin 114, in mm; the cross section of the wing root 1142 is an arc, and since the arc is small, it is simplified to a rectangle, that is, the cross-sectional inertia moment of a single arc fin 114 is I=bt 3 / 12, so the bending stress σ' generated in the section 1142 of the wing root satisfies the following relationship:

[0074]

[0075] σ' ≤ σ

[0076]

[0077] The root of the fin bears a circumferential bending moment under the action of the circumferential clamping pressure, and it is necessary to ensure that the bending stress σ' at the fin root 1142 does not exceed the material yield strength σ. The selection of the length-thickness ratio k should be determined according to the yield strength of the material, the working load, and the geometric dimensions of the fin. A reasonable length-thickness ratio can avoid the fin being too weak or too bulky, thus achieving the best load-bearing capacity.

[0078] S4. Parameter verification and optimization: Based on the range of the length-thickness ratio k of the arc-shaped fin 114 determined in step S3, select a reasonable initial length L and thickness t, establish a geometric model of the glue application disk 1, set boundary conditions and loading conditions, and through finite element simulation analysis, calculate the stress distribution, buckling behavior, and thermal expansion effect of the arc-shaped fin 114 at different numerical values of the length L and thickness t. According to the simulation analysis results, gradually adjust the numerical values of the length L and thickness t of the arc-shaped fin 114 until the best design goal is achieved;

[0079] Finite element analysis is an important tool for optimizing the design, which can simulate the actual working conditions of the arc-shaped fin 114, help further optimize the size and shape of the arc-shaped fin 114, ensure the performance and stability of the glue application disk 1, and by optimizing the thickness and length of the fin, the fin can bear the maximum load under working conditions without buckling or yielding.

[0080] S5. Assembly test: Conduct the assembly and actual test of the glue application disk 1 to verify whether the clamping friction torque meets the design requirements.

[0081] The assembly test is an important step to verify the correctness of the design. The actual test can ensure the consistency between the theoretical calculation of the design and the actual application, avoid unstable situations during the production process, and further adjust the design through the feedback of the test results to ensure its reliability and stability in the actual working environment.

[0082] As a preferred embodiment of the present invention, the ratio of the length L of the arc-shaped fin 114 to the thickness t of the fin root 1142 of the arc-shaped fin 114 in step S3 is also determined by buckling stability and satisfies the following relationship:

[0083]

[0084] In the formula, E is the elastic modulus of the arc-shaped fin 114, with the unit of Pa; b is the arc width of a single arc-shaped fin 114, with the unit of mm; n' is the safety factor, dimensionless; F' is the critical buckling load of the arc-shaped fin 114, that is, the minimum axial pressure causing instability, with the unit of N;

[0085] The principle of the ratio formula of the length L determined based on buckling stability to the thickness t of the fin root 1142 is that the arc-shaped fin 114 will not undergo buckling instability when compressed. The derivation process is as follows:

[0086] The Euler buckling theory describes the critical buckling load of a slender rod under axial compression. The formula is as follows

[0087]

[0088] In the formula, E is the elastic modulus of the arc-shaped fin 114, with the unit of Pa; b is the arc width of a single arc-shaped fin 114, with the unit of mm; n' is the safety factor, dimensionless. The safety factor n' is used to cover uncertainties such as manufacturing errors and dynamic loads, and usually takes a value of 2.0 - 2.5; F' is the critical buckling load of the arc-shaped fin 114, that is, the minimum axial pressure that causes instability, with the unit of N; I is the moment of inertia of the fin root 1142, and I = bt 3 / 12; K is the effective length factor, which is related to the boundary conditions and is dimensionless;

[0089] Since the fin root 1142 is fixed on the fastening part 112, the fin root 1142 is a fixed end, while the fin tip 1141 at the free end has no constraint. Therefore, the arc-shaped fin 114 belongs to the boundary conditions of a cantilever beam. The effective length of the cantilever beam is twice the actual length. Therefore, the effective length factor K = 2. Substituting into the formula, the ratio relationship between the length L of the arc-shaped fin 114 and the thickness t of the fin root 1142 of the arc-shaped fin 114 can be obtained as follows:

[0090]

[0091] The selection of the thickness t and the length L should not only meet the mechanical requirements but also be adjusted in combination with the buckling stability of the fin to avoid buckling instability during actual operation.

[0092] The present invention simplifies the arc-shaped fin 114 into a cantilever beam model. Through double-checking of strength and stability, it ensures that the stress of the fin root 1142 does not exceed the material yield strength, avoids plastic deformation or fracture caused by local stress concentration, and effectively prevents the fin from losing stability when compressed, improving the structural robustness.

[0093] As a preferred implementation manner of the present invention, the finite element simulation analysis in step S4 includes the nonlinear analysis of the conical contact surface between the arc-shaped fin 114 and the fastening sleeve 12, the fatigue strength check under cyclic loads, and focuses on the stress concentration factor at the connection between the fin root 1142 and the fastening part 112.

[0094] As a preferred embodiment of the present invention, the actual test of the glue coating disc 1 in step S5 is to add 1.2 times the rated torque to the glue coating part 111, test whether there is relative slip between the glue coating disc 1 and the roller 2, and record the residual deformation ε after unloading, requiring the residual deformation ε to be less than 0.05mm.

[0095] By applying excess torque, i.e. 120% of the rated value, the redundant capacity of the clamping friction torque is verified to ensure no slippage under extreme working conditions. At the same time, the stringent requirement of residual deformation ε<0.05mm ensures the dimensional stability of the structure after long-term use and avoids performance degradation caused by plastic deformation.

[0096] It should be understood that the above-mentioned embodiments are one or more embodiments of the present invention. There are many other embodiments and variations thereof based on the present invention. The variations and modifications made by ordinary technicians in this industry through the present invention without making pioneering innovations all fall within the scope of protection of the present invention.

Claims

1. A glue coating disc, sleeved on a roller, characterized in that: It includes a main body and a fastening sleeve, the main body includes an integrally formed rubber coating part and a fastening part, the rubber coating part is protruding relative to the fastening part, the outer diameter of the rubber coating part is larger than the fastening part, the fastening part is annular and is sleeved on the roller shaft, the fastening part is provided with a fin assembly along the axial direction of the roller shaft, the fin assembly includes a plurality of arc-shaped fins circumferentially arranged on the outer periphery of the roller shaft, and gaps are provided between adjacent arc-shaped fins; the fastening sleeve is sleeved on the outer periphery of the fin assembly, and the inner wall shape of the fastening sleeve is adapted to the outer wall shape of the fin assembly.

2. A glue coating disc according to claim 1, characterized in that: The arc-shaped fin comprises a wing tip at a free end and a wing root at a fixed end, the wing root is fixedly arranged on the fastening portion, the thickness from the wing root to the wing tip gradually decreases, and the cross-section of the arc-shaped fin is a right-angled triangle, the fin assembly is a conical cylinder structure, and the inner wall of the fastening sleeve is a conical surface structure to adapt to the outer wall shape of the fin assembly.

3. The glue coating disc according to claim 1, characterized in that: The inner diameter of the fastening sleeve is larger than the outer diameter of the fin assembly. The fastening sleeve is circumferentially provided with a plurality of through holes, and fastening rods are passed through the through holes. The fastening rods are used to drive the fastening sleeve to contract, thereby driving the fin assembly to hold the roller shaft tightly.

4. The glue coating disc according to claim 1, characterized in that: The inner diameter of the fastening sleeve is smaller than the outer diameter of the fin assembly, and the fastening sleeve and the fin assembly are interference-fitted, thereby driving the fin assembly to contract and hold the roller shaft.

5. The glue coating disc according to claim 1, characterized in that: There are multiple glue coating discs, and the multiple glue coating discs are arranged at intervals.

6. The glue coating disc according to claim 1, characterized in that: The fin assembly is made of spring steel with a surface roughness Ra≤1.6μm.

7. A method for designing a glue coating disc, characterized in that: For a glue coating disc according to claim 1, the design method comprises the following steps: S1. Determine the inner diameter of the fin assembly: The inner diameter D of the fin assembly is determined by the thermal expansion coefficient and the assembly tolerance, and satisfies the following relationship: D=D1+2Δ+δ Wherein, D is the inner diameter of the fin assembly, in mm; D1 is the outer diameter of the roller, in mm; Δ is the assembly clearance, in mm; δ is the assembly tolerance, in mm; The assembly gap △ needs to meet the thermal expansion requirements and satisfy the following relationship: Δ≥α(T max -T0)D1 Wherein, α is the material linear expansion coefficient of the fin assembly, unit is 1 / ℃; T max is the maximum operating temperature, in °C; T0 is the assembly temperature, in °C; S2. Determine the annular clamping stress of the fin assembly: the glue coating disc is sleeved on the roller shaft. When the roller shaft rotates, the glue coating part contacts the coating, and the glue coating process is completed by friction. The friction between the glue coating part and the coating generates a braking friction torque, and the braking friction torque drives the glue coating disc to rotate around the roller shaft. In order to stabilize the glue coating disc and the roller shaft to maintain a relatively static state, the fastening sleeve is sleeved on the fin assembly and radial pressure is applied to the fin assembly for fastening, driving the fin assembly to radially contract and clamp the roller shaft, generating a clamping friction torque to resist the braking friction torque T2. The clamping friction torque T1 satisfies the following relationship: (The fin assembly is set to be evenly stressed) Wherein, T1 is the clamping friction torque, T2 is the braking friction torque, F1 is the total circumferential clamping pressure of the fastening sleeve on the fin assembly, in N; F2 is the normal pressure of the coating on the glue coating part, which is determined by the coating tension force, in N; n is the safety factor, dimensionless; μ1 is the static friction coefficient between the fin assembly and the roller, dimensionless; μ2 is the static friction coefficient between the coating and the glue coating part, dimensionless; q is the circumferential clamping stress, in N / mm 2 ; L is the length of the fin assembly, in mm; D2 is the outer diameter of the glue coating portion, in mm; S3. Determine the length-to-thickness ratio k of the arcuate fin: the length-to-thickness ratio k is the ratio of the length L of the arcuate fin to the fin root thickness t of the arcuate fin. The length-to-thickness ratio k is determined by the yield strength of the material of the fin assembly and satisfies the following relationship: Wherein, t is the wing root thickness, in mm; q is the hoop clamping stress, in N / mm 2 ; L is the length of the fin assembly, in mm; σ is the yield strength of the arc fin, in N / mm 2 ; S4, parameter verification and optimization: based on the range of the length-to-thickness ratio k of the arc-shaped fin determined in step S3, a reasonable initial length L and thickness t are selected, a geometric model of the coating disc is established, boundary conditions and loading conditions are set, and the stress distribution, buckling behavior and thermal expansion effect of the arc-shaped fin at different length L and thickness t values ​​are calculated through finite element simulation analysis. According to the simulation analysis results, the length L and thickness t of the arc-shaped fin are gradually adjusted until the optimal design goal is achieved; S5. Assembly test: Assemble and actually test the rubber coating disc to verify whether the clamping friction torque meets the design requirements.

8. The method for designing a glue coating disc according to claim 1, characterized in that: The ratio of the length L of the arc-shaped fin to the wing root thickness t of the arc-shaped fin in step S3 is also determined by the buckling stability and satisfies the following relationship: Wherein, E is the elastic modulus of the arc fin, in Pa; b is the arc width of a single arc fin, in mm; n' is the safety factor, dimensionless; F' is the critical buckling load of the arc fin, that is, the minimum axial pressure that causes instability, in N.

9. The method for designing a glue coating disc according to claim 1, characterized in that: The finite element simulation analysis in step S4 includes nonlinear analysis of the conical contact surface between the arc-shaped fin and the fastening sleeve, fatigue strength verification under cyclic load, and focuses on the stress concentration factor at the connection between the wing root and the fastening portion.

10. The method for designing a glue coating disc according to claim 1, characterized in that: The actual test of the glue coating disc in step S5 is to apply 1.2 times the rated torque to the glue coating part, test whether there is relative slip between the glue coating disc and the roller shaft, and record the residual deformation ε after unloading, which is required to be less than 0.05mm.

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