Spring gear type rear compression roller and device
Through the design of the spring gear type rear pressure roller, the problem of air in the middle of the light truck tire forming is solved, the smooth drum-free and quality improvement of the fetal embryo is achieved, ensuring effective rolling and fit on the sidewall.
Patent Information
- Application Number
- CN202510650648.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-20
- Publication Date
- 2025-07-25
AI Technical Summary
During the forming process of light truck tires, the problem of air in the air caused by inadequate compression of the sidewall of different widths and thicknesses affects the quality of the tire.
A spring gear type rear press roller is used, with three layers of toothed strip protrusions on the roller body. The spring force is determined according to K = (Hs * P) / X, arranged in dislocation, and three groups are set to form a high and low difference structure to ensure effective rolling on the sidewall.
Effectively discharge interlayer air, ensure smooth sidewall without drums, improve tire quality, and avoid product deformation.
Smart Images
Figure CN120363522A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of press rollers of semi-steel radial light truck tire forming machines, and particularly to a lower press roller device during tire blank forming. Background Art
[0002] When manufacturing light truck tires, due to product characteristics, tire sides with different widths and thicknesses are used on the same forming machine. During rolling, the existing lower press roller is likely to be unable to roll properly when forming larger-sized light truck tires because of its small width. If the bottom cord layer is not properly adhered, especially when using irradiated cord, due to the difference in viscosity, a large amount of gas between the tire side and the cord cannot be rolled out, resulting in trapped air or delamination between layers, ultimately having an irreversible impact on tire quality. Summary of the Invention
[0003] The purpose of the present invention is to solve the problem of trapped air in the tire blank during the first-stage forming of light truck tires caused by improper pressing of tire sides with different widths and thicknesses, making the tire side smooth without air bubbles after roll pressing, and the tire blank meeting the process design requirements, and solving the related defects and quality problems caused by the trapped air problem.
[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions: A spring gear type rear press roller, which includes a mandrel, springs, and a roller body. The roller body is sleeved on the mandrel, and there is a space between the roller body and the mandrel. A number of springs are provided, and both ends of each spring are respectively connected to the outer diameter of the mandrel and the inner diameter of the roller body. The roller body is provided with 3 layers axially, and tooth-shaped strip protrusions are respectively provided on the radial outer circles of the 3 layers. The tooth-shaped strip protrusions on the two axially outer layers are arranged in the same way, and the tooth-shaped strip protrusions in the axial middle are arranged in a staggered manner with those in the axial outer layers; The elastic forces of a number of springs are not all unified, and the elastic force of each spring is determined according to the formula K = (Hs * P) / X; Wherein, K represents the spring stiffness coefficient, Hs represents the Shore hardness of the material, X represents the spring deformation amount and X ≤ 10 mm, and P represents the acting force coefficient and 0.85 ≤ P ≤ 0.95.
[0005] Preferably, the roller body is made of all-metal material.
[0006] Preferably, the roller body is in the shape of a thin sheet, and its thickness is 3 - 7 mm.
[0007] Preferably, the tooth-shaped strip protrusions are arranged in a staggered manner.
[0008] Preferably, the setting density of the tooth-shaped strip protrusions is relatively large.
[0009] Furthermore, the device is provided with a spring gear type rear pressure roller, and the pressure roller device includes at least three groups of spring gear type rear pressure rollers arranged coaxially.
[0010] Preferably, the three groups of rear pressure rollers are designed with a stepped height difference at intervals.
[0011] In summary, the advantages of the present invention are as follows: The advantage of the present invention is that the multi-piece stepped structure facilitates the discharge of air between layers, and the spring gear type structure can ensure that sidewalls of different sizes are effectively rolled without over-rolling and causing deformation of the product. Description of the Drawings
[0012] Figure 1 It is a diagram of a single-piece spring pressure roller; Figure 2 It is an effect diagram of a single-piece pressure roller; Figure 3 It is an assembly diagram of multi-piece pressure rollers; Figure 4 It is the pressing effect of the original carcass; Figure 5 It is the pressing effect diagram of this pressure roller device; Reference numerals: 1, mandrel; 2, spring; 3, roller body; 4, tooth-shaped strip protrusion. Detailed Description of the Invention
[0013] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.
[0014] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.
[0015] At the same time, it should be noted that: similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0016] Next, a detailed description of the specific implementation manners of the present invention will be given in conjunction with the drawings.
[0017] AsFigures 1 to 5 As shown in the figure, a spring gear type rear pressure roller includes a mandrel 1, a spring 2 and a roller body 3. The roller body 3 is sleeved on the mandrel 1, and there is a space between the roller body 3 and the mandrel 1. A plurality of springs 2 are provided and the two ends are respectively connected to the outer diameter of the mandrel 1 and the inner diameter of the roller body 3. The roller body 3 is provided with 3 layers axially, and tooth-shaped strip protrusions 4 are respectively provided on the radially outer circles of the 3 layers. The tooth-shaped strip protrusions 4 on the two axially outer layers are arranged in the same way, and the tooth-shaped strip protrusions 4 in the middle and the axially outer layers are arranged in a staggered manner.
[0018] The surface of the rear pressure roller adopts a spring 2 gear type structure to effectively fit the tire side, so that different positions of the tire side are rolled while ensuring that the thickness of the product remains in the designed ratio, avoiding the risk of lack of rubber in the finished tire caused by the thick part being pressed thin and the risk of secondary air entrapment caused by the edge being pressed and broken at the edge.
[0019] Due to the different hardness of the tire side rubber, the elastic forces of the springs 2 in the rear pressure roller cannot all be unified, and springs 2 with different stiffness coefficients (K) need to be selected according to different tire side rubbers. The elastic force of each spring 2 is determined according to the formula K = (Hs * P) / X; Among them, K represents the stiffness coefficient of the spring 2; Hs represents the Shore hardness of the material; X represents the deformation of the spring 2. During normal operation, the deformation of the pressure roller cannot be very large. According to the thickness change rule of the tire side of a section of tire embryo, it is generally controlled ≤10mm; P represents the force coefficient (0.85 ≤ P ≤ 0.95, and the pressure roller can press the product without deformation in the static state).
[0020] The roller body 3 of the above-mentioned rear pressure roller is in the shape of a thin sheet, with a thickness of 3-7mm, and the roller body 3 is made of all-metal material. This can better exhaust air from the tire side, and the setting of all-metal material can avoid the problem of rubber aging and will not adhere to the tire material.
[0021] As Figure 3 shown, the tooth-shaped strip protrusions 4 are arranged in a staggered manner and the setting density of the tooth-shaped strip protrusions 4 is relatively large, so that the rear pressure roller can better discharge the air bag.
[0022] Furthermore, the device is provided with a spring 2 gear type rear pressure roller. The pressure roller device includes at least three groups of coaxially arranged spring 2 gear type rear pressure rollers. By adopting a three-group interval high-low design, a gradient can be formed when the pressure roller presses, and the air bubbles between the material layers move along the rolling direction and are discharged cleanly, ensuring the tight fit between multiple layers of products.
[0023] The advantages of the present invention are that the multi-group height difference structure is convenient for the discharge of air between layers, and the spring 2 gear type structure can ensure that tire sides of different sizes are effectively rolled, and will not over-roll and cause the deformation of the product.
[0024] Test example I. Test Objectives Verify the differences in the gas discharge effect between the tire side layers and the bonding uniformity when the roller body adopts three structures: single-layer roller body (control group A), three-layer roller body with the three-layer tooth-shaped strips in the same phase (control group B), and three-layer roller body with the middle-layer tooth-shaped strip offset from the outer layer (invention group C) under the same process conditions, and prove the technical effect of the middle-layer offset structure.
[0025] II. Test Materials and Equipment Test materials: Light truck tire side rubber sheets and irradiated cord fabric of the same batch; Molding machine: Standard semi-steel radial light truck tire molding machine; Rear pressure roller specifications: Diameter Φ150 mm, width 100 mm; Group A: Single-layer thin sheet roller, without tooth-shaped strips on the outer diameter Group B: Three-layer roller, with the tooth-shaped strips of each layer in the same phase Group C: Three-layer roller, with the middle-layer tooth-shaped strip offset from the outer layer by ½ pitch.
[0026] Sensing / detection equipment: Ultrasonic C-scan: Quantitatively detect the volume fraction of air bubbles between layers; Pressure distribution sensor film (resolution 1 mm): Measure the uniformity of the pressure distribution on the tire side surface after roller pressing; Peel strength tester: Determine the bonding strength between the cord and the rubber layer.
[0027] III. Test Methods and Procedures Step Content Parameter / Description 1 Pretreatment and Installation Same formula film and cord fabric; the green tire is preformed to the state of the first stage without rolling 2 Rolling Forming Rotational speed: 30 r / min; total pressing force: 500 N; temperature: 23°C; each group repeats 10 times 3 Ultrasonic C-scan Frequency: 5 MHz; the scanning area covers the entire rolling width; extract the volume fraction of interlayer bubbles (%) 4 Measurement of Surface Pressure Distribution Place the pressure film between the tire side and the roller body, take the pattern after rolling, and calculate the standard deviation σ_P of the pressure distribution; the smaller σ_P is, the more uniform it is 5 Peel Strength Test Peeling speed: 50 mm / min; record the average bonding strength F_peel (N / cm) 6 Data Processing Perform ANOVA analysis on the bubble volume fraction, σ_P, and F_peel of groups A, B, and C, with a significance level α = 0.05 IV. Evaluation Indicators 1. Volume fraction of air bubbles between layers: The lower the volume fraction, the better the air discharge effect.
[0028] 2. Pressure distribution uniformity σ_P: The smaller the standard deviation, the more uniform the bonding pressure.
[0029] 3. Peel strength F_peel: The higher the value, the more reliable the bonding between layers.
[0030] V. Expected Results Group Bubble Volume Fraction (%) Pressure Distribution σ_P (%) Peel Strength F_peel (N / cm) A (single layer) 3–5 12–15 8–10 B (three layers in phase) 1.5–2.5 6–8 10–12 C (three layers offset) <1.0 <4 12–14 It can be seen that the invention group C is expected to have the lowest volume fraction of air bubbles, the most uniform pressure, and the highest bonding strength, significantly superior to the control groups A and B.
[0031] The foregoing is a description of embodiments of the present invention. Through the above description of the disclosed embodiments, those skilled in the art can implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1. A spring gear type rear pressure roller, characterized in that, The rear pressure roller includes a mandrel (1), a spring (2) and a roller body (3). The roller body (3) is sleeved on the mandrel (1), and there is a space between the roller body (3) and the mandrel (1). A number of springs (2) are provided, and the two ends of each spring (2) are respectively connected to the outer diameter of the mandrel (1) and the inner diameter of the roller body (3). The roller body (3) is provided with three layers axially. Tooth-shaped strip protrusions (4) are respectively arranged on the radially outer circles of the three layers. The tooth-shaped strip protrusions (4) on the two axially outer layers are arranged in the same way, and the tooth-shaped strip protrusions (4) in the axial middle are arranged in a staggered manner with those in the axial outer layer; Among them, the elastic forces of a number of springs (2) are not all unified, and the elastic force of each spring (2) is determined according to the formula K = (Hs * P) / X; Among them, K represents the stiffness coefficient of the spring (2), Hs represents the Shore hardness of the material, X represents the deformation amount of the spring (2) and X ≤ 10 mm, and P represents the acting force coefficient and 0.85 ≤ P ≤ 0.
95.
2. The spring gear type rear pressure roller according to claim 1, wherein The roller body (3) is made of all-metal material.
3. The spring gear type rear pressure roller according to claim 2, characterized in that, The roller body (3) is in the shape of a thin sheet, and its thickness is 3 - 7 mm.
4. A spring gear type rear pressure roller device, characterized in that, This device is arranged by using a spring gear type rear pressure roller described in any one of claims 1 - 3 of the claims. The said pressure roller device includes at least three groups of spring gear type rear pressure rollers arranged coaxially.
5. The spring gear type rear pressure roller device according to claim 4, characterized in that, The three groups of rear pressure rollers adopt an intermittent high-low design.