Blocky tread pattern with fractal structure

Abstract

The present invention provides a block-shaped tread pattern with a fractal structure, relating to the technical field of vehicle tire tread patterns. The tread comprises a plurality of pattern blocks spaced circumferentially along the tire, the pattern blocks being symmetrically arranged about the tread centerline; deep grooves disposed between the pattern blocks; a plurality of fractal grooves formed on the pattern blocks; fractal grooves disposed at the edges of the pattern blocks extending into the deep grooves; and a depth of 1 mm to 1.5 mm for each fractal groove. This solves the technical problem of prior art tread patterns, which suffer from poor water drainage and heat dissipation, leading to performance degradation during prolonged, high-load operation. The invention achieves the technical effect of improving the tire's hydroplaning and heat dissipation performance.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle tire tread patterns, in particular to a block tread pattern with a fractal structure. Background Art

[0002] During vehicle operation, tires, as the only part in contact with the ground, play a critical role in load-bearing, braking, and ensuring driving safety. When a vehicle is driving on a normal road, the actual contact area between the tire and the ground is similar to that between the sole of a shoe and the ground. With such a limited contact area, the tread pattern on the tire determines its performance.

[0003] Currently, most trucks use longitudinal patterns, that is, a number of pattern blocks are arranged in a horizontal circle on the tire tread, and the fractal pattern grooves run through horizontally; the longitudinal pattern performs well in terms of braking force and driving force, and can meet the load requirements of trucks to a certain extent.

[0004] However, in rainy or flooded roads, existing tread patterns are unable to quickly and effectively drain water between the tire and the ground. The resulting water film can cause hydroplaning, significantly reducing tire grip. Furthermore, compared to ordinary vehicles, truck tires experience greater pressure and friction when driving, generating significant heat. Without timely heat dissipation, tire temperatures continue to rise. This not only accelerates tire rubber aging and shortens service life, but can also damage the tire's internal structure, leading to serious accidents such as blowouts.

[0005] Therefore, the tread pattern of truck tires in the prior art has poor drainage and heat dissipation effects, and the performance of the tires decreases significantly when working under high load and high load for a long time, making it difficult to adapt to the frequent long-distance transportation and heavy-load requirements of trucks. Summary of the Invention

[0006] The purpose of the present invention is to provide a block tread pattern with a fractal structure to alleviate the technical problem in the prior art that the tread pattern degrades in performance when working under high load and high load for a long time due to water drainage and heat dissipation.

[0007] To achieve the above object, the technical solution of the present invention is as follows:

[0008] The present invention provides a block-shaped tread pattern with a fractal structure, comprising:

[0009] The tread has several pattern blocks spaced apart along the circumference of the tire. The pattern blocks are symmetrically arranged around the centerline of the tread. Deep grooves are provided between the pattern blocks.

[0010] A plurality of fractal grooves are provided on the tread blocks; the fractal grooves provided on the edges of the tread blocks extend into deep grooves;

[0011] The depth of the fractal grooves is 1mm to 1.5mm.

[0012] Furthermore, the area ratio of the pattern blocks to the tread surface is 70% to 80%, the pattern blocks are in the shape of round heads, stepped walls are provided on both sides of the pattern blocks, the ends of the stepped walls extend to the bottom of the deep groove, a groove is provided at the center position of the tail of the pattern block, and a first protrusion is provided between the round head ends of two adjacent pattern blocks.

[0013] Furthermore, the depth of the step wall is 4 mm to 16 mm, and the included angle α of the step wall is 15° to 18°, where the included angle α is the angle between the end face of the step wall and the center normal of the deep groove;

[0014] The depth of the groove is 5 mm to 6 mm; the height of the first protrusion is 5 mm to 6 mm;

[0015] The depth of the deep groove is 21 mm to 22 mm, and the angle β between the deep groove and the center normal is 8° to 10°.

[0016] Furthermore, the fractal pattern groove includes a first arrow groove and a second arrow groove that are arranged alternately, the first arrow groove has the same indication direction as the pattern block, and the second arrow groove has an indication direction away from the first arrow groove.

[0017] Furthermore, the longitudinal distance between two adjacent second arrow-shaped grooves is 2 mm to 3 mm, the tip angle γ of the first arrow-shaped groove and the second arrow-shaped groove is 90° to 95°, and the transverse lengths of the first arrow-shaped groove and the second arrow-shaped groove are both 15 mm to 16 mm.

[0018] Furthermore, the area ratio of the pattern blocks to the tread surface is 60% to 70%, and a second protrusion is provided between two adjacent longitudinal pattern blocks; and the groove wall of the deep groove is in a broken line shape.

[0019] Furthermore, the height of the second protrusion is 5 mm to 6 mm;

[0020] The depth of the deep groove is 11 mm to 12 mm, the angle θ1 between the top of the deep groove and the center normal is 22° to 23°, and the angle θ2 between the deep groove fold line and the center normal is 11° to 12.5°.

[0021] Furthermore, the fractal pattern grooves include wave transverse grooves and arcuate transverse grooves, the ends of two oppositely arranged wave transverse grooves are connected, and the arcuate transverse groove is arranged on one side of the wave transverse groove.

[0022] Furthermore, the end spacing of the wave transverse groove is 3mm to 4mm, and the bending angle of the arc-shaped transverse groove is 40° to 45°.

[0023] Beneficial effects:

[0024] The present invention provides a block-shaped tread pattern with a fractal structure, comprising a plurality of pattern blocks spaced circumferentially along the tire, the pattern blocks being symmetrically arranged about the tread centerline; deep grooves between the pattern blocks; and fractal grooves at the edges of the pattern blocks extending into the deep grooves, forming a drainage system. When a loaded vehicle travels on a flooded road, accumulated water in the tire-ground contact area can quickly flow through the fractal grooves into the deep grooves, preventing the formation of a water film between the tire and the ground. This effectively prevents hydroplaning, ensures sufficient friction between the tire and the ground, and guarantees driving safety.

[0025] Several fractal grooves are incorporated into the tread blocks; these grooves extend deep into the tread edges. This fractal structure creates a complex and refined pattern, increasing the tire's contact area with the outside air compared to traditional, simple grooves. Furthermore, the irregular shape and staggered layout of the fractal grooves disrupt the flow of air as the tire rotates. When a heavy vehicle is in motion, friction between the tire and the ground generates significant heat. The increased contact area and airflow efficiently transfer this heat to the air, accelerating the heat dissipation process and preventing tire performance degradation due to overheating.

[0026] The depth of the fractal grooves is 1mm to 1.5mm, ensuring they have enough space to hold water while not being too deep to affect the tire's structural strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 A schematic structural diagram of a block-shaped tread pattern with a fractal structure provided by an embodiment of the present invention;

[0029] Figure 2 A schematic structural diagram of a tread block in a block-shaped tread pattern with a fractal structure provided by an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of the structure of a step wall in a block tread pattern with a fractal structure provided by an embodiment of the present invention;

[0031] Figure 4 A schematic structural diagram of a first protrusion in a block-shaped tread pattern with a fractal structure provided by an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of the structure of a groove in a block tread pattern with a fractal structure provided by an embodiment of the present invention;

[0033] Figure 6 A schematic diagram of the structure of a deep groove in a block tread pattern with a fractal structure provided by an embodiment of the present invention;

[0034] Figure 7 A schematic structural diagram of another block-shaped tread pattern with a fractal structure provided by an embodiment of the present invention;

[0035] Figure 8 A schematic structural diagram of a pattern block in another block-shaped tread pattern with a fractal structure provided by an embodiment of the present invention;

[0036] Figure 9 A schematic structural diagram of another deep groove in a block-shaped tread pattern with a fractal structure provided by an embodiment of the present invention.

[0037] Icons: 1-pattern block; 2-deep groove; 3-fractal groove;

[0038] 101-step wall; 102-groove; 103-first protrusion; 301-first arrow groove; 302-second arrow groove;

[0039] 104-second protrusion; 303-wave transverse groove; 304-arc-shaped transverse groove. DETAILED DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0041] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0042] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0043] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0044] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0045] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0046] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0047] Example 1

[0048] The present invention provides a block-shaped tread pattern with a fractal structure, comprising:

[0049] The tread has a plurality of pattern blocks 1 spaced apart along the circumference of the tire. The pattern blocks 1 are symmetrically arranged with the tread centerline as the center. Deep grooves 2 are provided between the pattern blocks 1.

[0050] A plurality of fractal grooves 3 are provided on the pattern block 1; the fractal grooves 3 provided on the edge of the pattern block 1 extend to the deep groove 2;

[0051] The depth of the fractal grooves 3 is 1 mm to 1.5 mm.

[0052] Specifically, if Figure 1As shown, the tire tread of the present invention is equipped with a number of tread blocks 1 spaced circumferentially, i.e., arranged around the tire. The tread blocks 1 are symmetrically arranged around the tread centerline, with the left and right blocks 1 having the same shape and size. This symmetrical layout ensures balanced force distribution in all directions, thereby improving driving stability. During driving, the pressure and friction experienced by the tire are evenly distributed across the tread blocks 1, preventing excessive local wear.

[0053] A gap, or deep groove 2, exists between adjacent tread blocks 1 in both the longitudinal and transverse directions. When driving on a flooded road, deep groove 2 quickly drains water between the tire and the ground, preventing the formation of a water film that can cause hydroplaning. This ensures good adhesion between the tire and the ground, guaranteeing driving safety. From a heat dissipation perspective, deep groove 2 increases the tire's contact area with the air, quickly dissipating frictional heat during operation, reducing tire temperature and improving tire durability and reliability.

[0054] Several fractal grooves 3 are formed on the tread block 1. These fractal grooves 3 are complex, formed by a fractal structure. Compared to traditional tire lateral grooves, their shape and layout provide more airflow channels. These grooves further increase the tire's surface area, enhancing drainage capabilities by allowing accumulated water to converge more quickly into the deep grooves 2 through these fine fractal patterns 3. This also significantly improves heat dissipation. The increased surface area allows for more efficient heat exchange between the tire and the air, dissipating heat more effectively. Furthermore, the fractal grooves 3 at the edge of the tread block 1 extend into the deep grooves 2, forming a drainage network. Accumulated water can flow smoothly from the fractal grooves 3 into the deep grooves 2 and then out of the tire's contact area with the ground.

[0055] The depth of the fractal grooves 3 is 1mm to 1.5mm. This ensures that the fractal grooves 3 have enough space to accommodate water accumulation to cope with varying degrees of flooding on roads, while not being too deep to affect the structural strength of the tread blocks 1, ensuring that the tire maintains its performance while bearing the weight of the vehicle and various forces acting during driving.

[0056] Example 2

[0057] In Example 2 of the present invention, the area ratio of the pattern block 1 to the tread is 70% to 80%, the pattern block 1 is in a round-headed indicator shape, and stepped walls 101 are provided on both sides of the pattern block 1. The ends of the stepped walls 101 extend to the bottom of the deep groove 2. A groove 102 is provided at the center position of the tail of the pattern block 1, and a first protrusion 103 is provided between the round-headed ends of two adjacent pattern blocks 1.

[0058] The depth of the step wall 101 is 14 mm to 16 mm, and the included angle α of the step wall 101 is 15° to 18°, where the included angle α is the angle between the end face of the step wall 101 and the center normal of the deep groove 2;

[0059] The depth of the groove 102 is 5 mm to 6 mm; the height of the first bump 103 is 5 mm to 6 mm;

[0060] The depth of the deep groove 2 is 21 mm to 22 mm, and the angle β between the deep groove 2 and the center normal is 8° to 10°.

[0061] Specifically, if Figure 1 、 Figure 2 As shown, pattern block 1 occupies 70% to 80% of the tread area. The higher proportion allows the tire to have a larger effective support area when in contact with the ground, thereby enhancing the tire's load-bearing capacity for the vehicle, meeting the use requirements of heavy-duty vehicles that have higher load-bearing performance requirements for tires.

[0062] like Figure 3 As shown, stepped walls 101 are provided on the left and right sides of the tread block 1, and the ends of the stepped walls 101 extend to the deep groove 2. The stepped wall 101 is divided into two steps, each of which has a depth of 7mm to 8mm, and a total depth of 14mm to 16mm. When the tire is running on a flooded road, the accumulated water can flow into the deep groove 2 along the surface of the stepped wall 101, accelerating the drainage process. The angle α is between 15° and 18°, which is the angle between the end face of the stepped wall 101 and the center normal of the deep groove 2, so that the accumulated water can flow to the deep groove 2 more efficiently. At the same time, the force distribution on the side of the tire is reasonably adjusted, thereby enhancing the durability of the tire under complex road conditions.

[0063] like Figure 5 As shown, a groove 102 extending to the sidewall is provided at the center of the rear portion of the tread block 1. The groove 102 has a depth of 5 to 6 mm. This not only further enhances the tire's drainage capacity, allowing accumulated water to be quickly drained from the center of the tread block 1, but also alleviates stress concentration caused by the rear end of the tire during rolling, thereby improving the overall strength and service life of the tread block 1.

[0064] like Figure 4 As shown, a first bump 103 is provided between the rounded ends of two adjacent tread blocks 1. The height of the first bump 103 is 5 mm to 6 mm. The first bump 103 enhances the connection stability between the tread blocks 1 during tire operation, reducing damage or deformation of the tread blocks 1 caused by uneven force.

[0065] like Figure 6As shown, the deep groove 2 in this embodiment has a depth of 21mm to 22mm. This ensures that even in the event of significant water accumulation, the deep groove 2 can prevent water from accumulating between the tire and the ground, effectively preventing hydroplaning. The angle β between the deep groove 2 and the center normal is 8° to 10°. This angle improves the flow direction of water within the deep groove 2, allowing it to drain more quickly from the tire side, further enhancing the tire's drainage performance and ensuring vehicle safety on slippery roads.

[0066] In an embodiment of the present invention, the fractal groove 3 includes a first arrow groove 301 and a second arrow groove 302 arranged alternately. The first arrow groove 301 has the same indication direction as the pattern block 1 , and the second arrow groove 302 has an indication direction away from the first arrow groove 301 .

[0067] The longitudinal distance between two adjacent second arrow-shaped grooves 302 is 2 mm to 3 mm, the tip angle γ of the first arrow-shaped groove 301 and the second arrow-shaped groove 302 is 90° to 95°, and the transverse lengths of the first arrow-shaped groove 301 and the second arrow-shaped groove 302 are both 15 mm to 16 mm.

[0068] Specifically, if Figure 2 As shown, the fractal pattern groove 3 includes a staggered arrangement of first arrow grooves 301 and second arrow grooves 302, that is, a row of first arrow grooves 301 and a row of second arrow grooves 302; the complexity of the fractal structure of multiple arrow patterns is utilized to provide more air flow channels, helping the tire to better dissipate heat under high-speed driving or load conditions, and reduce performance degradation caused by overheating.

[0069] When a vehicle travels on a flooded road, the first arrow-shaped groove 301, aligned with the direction indicated by the tread block 1, quickly guides the water along its path. The second arrow-shaped groove 302, pointing in the opposite direction, collects the water, allowing it to interweave between the two arrow-shaped grooves, accelerating its flow and ultimately draining quickly from the tire. The longitudinal spacing between adjacent second arrow-shaped grooves 302 is controlled at 2mm to 3mm, allowing water to flow quickly through the narrow gap, further improving drainage efficiency and ensuring vehicle safety on slippery roads.

[0070] The tip angle γ of the first and second arrow-shaped grooves 301, 302 is between 90° and 95°. Each groove has a horizontal length of 15mm to 16mm, increasing the tire's contact area with the air. During high-speed tire rotation, a large amount of air can more fully contact the inner surfaces of the grooves, accelerating heat transfer and rapidly dissipating the heat generated by friction between the tire and the ground into the air.

[0071] The repeated fractal structures of the first arrow groove 301 and the second arrow groove 302 in the fractal pattern groove 3 have similar complexity, which improves drainage, grip and heat dissipation performance, and enhances the comprehensive performance of the truck tire under various road conditions.

[0072] Example 3

[0073] In Example 3 of the present invention, the area ratio of the pattern blocks 1 to the tread surface is 60% to 70%, and a second protrusion 104 is provided between two adjacent longitudinal pattern blocks 1; the groove wall of the deep groove 2 is in a broken line shape.

[0074] The height of the second bump 104 is 5 mm to 6 mm;

[0075] The depth of the deep groove 2 is 11 mm to 12 mm, the angle θ1 between the top of the deep groove 2 and the center normal is 22° to 23°, and the angle θ2 between the fold line of the deep groove 2 and the center normal is 11° to 12.5°.

[0076] Specifically, if Figure 7 、 Figure 8 and Figure 9 As shown, the tread blocks 1 account for 60% to 70% of the tread area. This ensures sufficient grip while leaving ample space for the deep grooves 2 for drainage and heat dissipation. A second bump 104, 5mm to 6mm in height, is located between adjacent longitudinal tread blocks 1. This second bump 104 not only enhances the connection stability between the tread blocks 1 but also helps them better disperse road forces during driving, effectively reducing damage to the blocks 1 due to localized excessive forces and extending the overall tire life.

[0077] In the present invention, the broken line of deep groove 2 can significantly improve the stone-prevention rate. When a vehicle is traveling on complex road conditions, especially when the road surface is covered with stones, ordinary straight-walled deep grooves can easily embed stones. The broken-line groove wall of deep groove 2 can change the movement trajectory of stones when they enter the deep groove. When the stones contact the broken line, it is difficult to stay stably in the deep groove due to the change in angle, and most of them will be thrown out of the deep groove during the rolling of the tire. The depth of deep groove 2 is 11mm~12mm, the angle θ1 between the top and the center normal is 22°~23°, and the angle θ2 between the broken line and the center normal is 11°~12.5°. The angle combined with the broken line shape makes it difficult for stones to find a position where they can be embedded and stably stay after entering the deep groove. Compared with traditional straight-walled deep grooves, broken-line deep grooves greatly reduce the probability of stone embedding and effectively improve the stone-prevention rate. This not only reduces the wear on the tires caused by embedded stones, but also avoids potential safety hazards caused by stones rolling and rubbing in deep grooves, ensuring that the tires can continue to perform stably under various road conditions.

[0078] The fractal pattern grooves 3 include a wave transverse groove 303 and an arcuate transverse groove 304 . The ends of the two oppositely arranged wave transverse grooves 303 are connected, and the arcuate transverse groove 304 is arranged on one side of the wave transverse groove 303 .

[0079] The end spacing of the wave transverse groove 303 is 3 mm to 4 mm, and the bending angle of the arc-shaped transverse groove 304 is 40° to 45°.

[0080] Specifically, if Figure 7 As shown, the fractal pattern groove 3 adopts a repeated, similar fractal structure consisting of wave transverse grooves 303 and arc transverse grooves 304.

[0081] Two opposing, end-connected wave grooves 303 form a water flow path. When the tire travels on a flooded road, the accumulated water flows into the wave grooves 303. The connected end design allows the accumulated water to flow between the wave grooves 303 in different areas, accelerating the diffusion and discharge of the accumulated water. The end-to-end spacing, that is, the longitudinal difference between the ends of each wave groove 303, is maintained at 3mm to 4mm. This spacing effectively prevents clogging by debris and ensures that accumulated water flows quickly within a limited space, preventing water from accumulating between the tire and the ground. This reduces the risk of hydroplaning and improves vehicle safety on slippery roads.

[0082] The arc-shaped transverse groove 304 matching the wave transverse groove 303 is arranged on one side of the wave transverse groove 303. Its bending angle of 40° to 45° enables the edge of the tread groove to fit the microscopic undulations of the road surface when the tire contacts the ground.

[0083] The wave-like fractal combination of wave-shaped transverse grooves 303 and arc-shaped transverse grooves 304 ensures strength while increasing the tire's contact area with the air. When the tire rotates at high speeds, air is more fully in contact with the surface of the fractal grooves 3, accelerating heat transfer. Heat generated by friction between the tire and the ground is quickly dissipated into the air, effectively preventing tire performance degradation due to overheating, extending the tire's service life, and ensuring that the tire maintains optimal performance over extended use.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A block-shaped tread pattern with a fractal structure, characterized in that: include: A plurality of pattern blocks (1) are distributed at intervals along the circumference of the tire on the tread, wherein the pattern blocks (1) are symmetrically arranged with the tread centerline as the center; deep grooves (2) are provided between the pattern blocks (1); A plurality of fractal grooves (3) are provided on the pattern block (1); the fractal grooves (3) provided at the edge of the pattern block (1) extend to the deep groove (2); The depth of the fractal grooves (3) is 1 mm to 1.5 mm; The fractal groove (3) comprises a first arrow groove (301) and a second arrow groove (302) arranged alternately, wherein the first arrow groove (301) has the same indication direction as the pattern block (1), and the second arrow groove (302) has an indication direction away from the first arrow groove (301); The longitudinal spacing between two adjacent second arrow grooves (302) is 2 mm to 3 mm, the tip angle γ of the first arrow groove (301) and the second arrow groove (302) is 90° to 95°, and the transverse lengths of the first arrow groove (301) and the second arrow groove (302) are both 15 mm to 16 mm; The area ratio of the pattern block (1) to the tread surface is 70% to 80%, the pattern block (1) is in a round-headed indicator shape, stepped walls (101) are provided on both sides of the pattern block (1), the ends of the stepped walls (101) extend to the bottom of the deep groove (2), a groove (102) is provided at the center of the tail of the pattern block (1), and a first protrusion (103) is provided between the round-headed ends of two adjacent pattern blocks (1); The depth of the stepped wall (101) is 14 mm to 16 mm, and the included angle α of the stepped wall (101) is 15° to 18°, where the included angle α is the angle between the end face of the stepped wall (101) and the center normal of the deep groove (2); The depth of the groove (102) is 5 mm to 6 mm; the height of the first protrusion (103) is 5 mm to 6 mm; The depth of the deep groove (2) is 21 mm to 22 mm, and the angle β between the deep groove (2) and the center normal is 8° to 10°.

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