A conveyor belt surface structure, a mold and a method of manufacturing thereof

Abstract

The application discloses a conveyor belt surface structure and a mold and a preparation method thereof. The conveyor belt surface structure comprises high protrusion units, low protrusion units and gradient transition zones. The high protrusion units and the low protrusion units are distributed in intervals, and both of them comprise protrusion regions and root regions. The gradient transition zones are connected between the root regions of the high protrusion units and the root regions of the low protrusion units. The high protrusion units are composed of pure polydimethylsiloxane. The low protrusion units and the gradient transition zones are both composed of pure polydimethylsiloxane and silica particles. The application designs the conveyor belt surface structure based on the gradient elastic modulus, realizes the stability of the goods transportation and the optimization of the energy efficiency through the stepwise difference and the spatial distribution adjustment of the material performance, can improve the transportation efficiency by 40% and reduce the unit energy consumption by 35% under the same working condition, effectively solves the industrial contradiction between the high-efficiency sorting and the energy saving and consumption reduction, and provides key technical support for the intelligent logistics upgrading.

Description

Technical Field

[0001] This invention relates to the technical field of polymer composite materials and conveying equipment, and in particular to a conveyor belt surface structure based on the gradient elastic modulus of a PDMS matrix, its mold and preparation method. Background Technology

[0002] With the rapid development and popularization of internet technology, online shopping has become the mainstream consumption method in modern times, greatly driving the explosive growth of the express delivery industry. Especially during shopping peaks such as "Double Eleven" and "618", logistics transit stations often face the pressure of "warehouse overload" caused by the surge in parcels, posing a severe challenge to sorting and transportation efficiency.

[0003] In current express delivery sorting systems, inclined conveyor belts are commonly used to transport packages to the upper sorting area. However, traditional conveyor belts have significant drawbacks: for loosely packaged, misaligned, or irregularly shaped packages (accounting for approximately 15%-20% of daily processing volume), tumbling and slippage are common during the incline transport process, leading to sorting interruptions and increased error rates. Existing solutions often involve adding auxiliary transport equipment, which, while partially improving stability, significantly increases system complexity, power consumption by over 30%, and maintenance costs. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a conveyor belt surface structure based on the gradient elastic modulus of a PDMS matrix. Through the synergistic design of materials and structure, stable transportation of express mail and energy saving are achieved. Simultaneously, a mold and method for preparing the conveyor belt surface structure are designed.

[0005] To achieve the above objectives, the technical solution provided by this invention is as follows: A conveyor belt surface structure includes high-protrusion units, low-protrusion units, and a gradient transition region; The high-protrusion units and low-protrusion units are distributed at intervals, and both include a protrusion region and a root region. The gradient transition region connects the root region of the high-protrusion unit and the root region of the low-protrusion unit. The high-protrusion unit is composed of pure polydimethylsiloxane; Both the low-protrusion unit and the gradient transition region are composed of pure polydimethylsiloxane and silica particles.

[0006] Furthermore, the curves of both the high-protrusion unit surface and the low-protrusion unit surface are linear; in, The curve of the highly protruding unit surface satisfies: y = 5sin(2x + π) The curve of the low-protrusion unit surface satisfies: y = 2*sin(2*x).

[0007] Furthermore, the elastic modulus of the high-protrusion unit is 0.3-0.8 MPa; The mass fraction of silica particles in the low-protrusion unit is 30%-60%, and the elastic modulus is 5-15 MPa.

[0008] Furthermore, the silica particle content in the gradient transition region increases linearly from high-bump unit to low-bump unit, from 0% to 30%.

[0009] Furthermore, the particle size of the silica particles in the low-protrusion unit and the particle size of the silica particles in the gradient transition region are both 10-50 μm, and both have undergone surface treatment with γ-methacryloyloxypropyltrimethoxysilane.

[0010] Furthermore, to achieve the above objectives, the present invention also provides a mold for preparing the above-mentioned conveyor belt surface structure, which includes a first mold for forming the raised region of the high raised unit and the raised region of the low raised unit, and a second mold for cooperating with the first mold to form the root region of the high raised unit, the root region of the low raised unit, and the gradient transition region. The second mold is disposed inside the first mold and is detachably connected to the first mold. The second mold is provided with mold holes corresponding to the root region of the high protrusion unit, the root region of the low protrusion unit, and the gradient transition region, respectively.

[0011] Furthermore, to achieve the above objectives, the present invention also provides a method for preparing the above-mentioned conveyor belt surface structure, comprising: Prepare molds that are compatible with high-protrusion units, low-protrusion units, and gradient transition regions; Pure polydimethylsiloxane is injected into the mold cavity of the corresponding high-protrusion unit protrusion area; Pure polydimethylsiloxane and silica particles are simultaneously injected into the mold cavity of the corresponding low-protrusion unit protrusion area. Simultaneously perform injection molding operations on the root region of high-protrusion units, the root region of low-protrusion units, and the gradient transition zone. The product is cured in one piece at 60-80℃ for 1-2 hours, and then demolded to obtain the finished product.

[0012] Furthermore, injection molding operations are performed simultaneously on the root region of the high-protrusion unit, the root region of the low-protrusion unit, and the gradient transition region, including: Pure polydimethylsiloxane is injected into the mold cavity corresponding to the root region of the high-protrusion unit. Pure polydimethylsiloxane and silica particles are simultaneously injected into the mold cavity of the corresponding low-protrusion unit root area, and the silica particles are injected uniformly. Pure polydimethylsiloxane and silica particles are simultaneously injected into the mold cavity of the corresponding gradient transition zone of the mold, and the silica particles are injected in a linear increasing manner from the high protrusion unit to the low protrusion unit.

[0013] Furthermore, the prepared mold includes a first mold for forming the raised area of ​​the high-protrusion unit and the raised area of ​​the low-protrusion unit, and a second mold for cooperating with the first mold to form the root area of ​​the high-protrusion unit, the root area of ​​the low-protrusion unit, and the gradient transition area; the second mold is disposed inside the first mold and is detachably connected to the first mold, and the second mold is provided with mold holes corresponding to the root area of ​​the high-protrusion unit, the root area of ​​the low-protrusion unit, and the gradient transition area respectively; Before simultaneously performing injection molding operations on the root region of the high-protrusion unit, the root region of the low-protrusion unit, and the gradient transition zone, the second mold is first installed into the mold cavity of the first mold corresponding to the root region of the high-protrusion unit, the root region of the low-protrusion unit, and the gradient transition zone. After the injection molding operations of the root region of the high-protrusion unit, the root region of the low-protrusion unit, and the gradient transition zone are completed, the second mold is removed from the first mold, and the material of the gradient transition zone is naturally fused with the material of the root region of the adjacent high-protrusion unit and the material of the root region of the low-protrusion unit.

[0014] Furthermore, after preparing the mold, a high-temperature resistant fluorocarbon release agent is sprayed into the mold, and the mold is preheated to 80-100℃ to reduce material shrinkage and deformation during injection molding; Before injecting pure polydimethylsiloxane into the raised area of ​​the mold corresponding to the high-raised unit, the pure polydimethylsiloxane is thoroughly stirred and vacuum degassed; after the pure polydimethylsiloxane is injected into the raised area of ​​the mold corresponding to the high-raised unit, it is kept at 80-100℃ for 15 minutes for pre-curing, so that the pure polydimethylsiloxane in the raised area of ​​the high-raised unit is initially shaped. After simultaneously injecting pure polydimethylsiloxane and silica particles into the raised area of ​​the corresponding low-protrusion unit in the mold, the mixture of the low-protrusion unit raised area is hot-pressed. The process includes: Under a pressure of 0.3-0.5MPa, a dense filling structure is formed, and the temperature is simultaneously raised to 70℃ to initially solidify the mixture in the raised area of ​​the low-protrusion unit. The integrated curing process includes: The molded part is transferred to a low-temperature curing zone for stepped cooling: from 80℃ to 60℃, taking 1-2 hours, to eliminate internal stress in the material; then demolding is performed: after cooling to 40℃, the part is demolded to obtain a finished structure with high and low protrusions on the surface; finally, the function is enhanced: the surface of the high protrusion unit is subjected to plasma activation treatment and sprayed with a nano-scale hydrophobic coating with a contact angle >150°.

[0015] Compared with existing technologies, the principles and advantages of this technical solution are as follows: 1. In the conveyor belt surface structure, the low-elasticity, high-protrusion units wrap around the bottom of the goods through elastic deformation, effectively preventing loosely packaged goods from rolling and slipping; the high-elasticity, low-protrusion units will not collapse even when bearing heavy goods. This technical solution is based on the gradient elastic modulus for conveyor belt surface structure design. Through the step-like differences and spatial distribution adjustment of material properties, the stability and energy efficiency of goods transportation are optimized. Through actual testing, the conveyor belt surface structure described in this technical solution can improve transportation efficiency by 40% and reduce unit energy consumption by 35% under the same working conditions, effectively resolving the industry contradiction between "high-efficiency sorting" and "energy saving and consumption reduction," and providing key technical support for the upgrade of smart logistics.

[0016] 2. By using the first mold and the second mold together, the conveyor belt surface structure described in this technical solution can be precisely prepared. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the services required in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a perspective view of a conveyor belt surface structure according to an embodiment of the present invention; Figure 2 This is a front view of a conveyor belt surface structure according to an embodiment of the present invention; Figure 3 This is a perspective view of the mold used to prepare the surface structure of the conveyor belt in an embodiment of the present invention; Figure 4 This is an exploded view of the mold used to prepare the surface structure of the conveyor belt in an embodiment of the present invention; Figure 5 This is a flowchart illustrating the principle of the method for preparing the surface structure of the conveyor belt according to an embodiment of the present invention.

[0019] Figure label: 1-High-protrusion unit; 2-Low-protrusion unit; 3-Gradient transition zone; 4-Protrusion area; 5-Root area; 6-First mold; 7-Second mold. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments: like Figure 1 and Figure 2 As shown, the conveyor belt surface structure described in this embodiment includes multiple high-protrusion units 1, low-protrusion units 2, and a gradient transition zone 3; the width of the high-protrusion unit 1 is 3mm and the height is 5mm; the width of the low-protrusion unit 2 is 4mm and the height is 2mm; the width of the gradient transition zone 3 is 0.8mm.

[0021] Among them, the high-protrusion unit 1 and the low-protrusion unit 2 are distributed at intervals, and both include a protrusion region 4 and a root region 5. The gradient transition region 3 connects the root region 5 of the high-protrusion unit 1 and the root region 5 of the low-protrusion unit 2; the high-protrusion unit 1 is composed of pure polydimethylsiloxane (PDMS) with an elastic modulus of 0.5 MPa; both the low-protrusion unit 2 and the gradient transition region 3 are composed of pure polydimethylsiloxane and silicon dioxide (SiO2) particles; the elastic modulus of the low-protrusion unit 2 is 10 MPa, and the mass fraction of silicon dioxide particles in the low-protrusion unit 2 is 50%.

[0022] Specifically, in this embodiment, the curves on the surface of the high-protrusion unit 1 and the low-protrusion unit 2 are both linear. in, The curve of the surface of the high-protrusion element 1 satisfies: y = 5sin(2x + π) The curve of the surface of low-protrusion unit 2 satisfies: y = 2*sin(2*x).

[0023] Specifically, in this embodiment, the silica particle content in the gradient transition region 3 increases linearly from the high-protrusion unit 1 to the low-protrusion unit 2, from 0% to 30%, in order to eliminate stress concentration caused by abrupt changes in modulus.

[0024] The particle size of the silica particles in the low bump unit 2 and the particle size of the silica particles in the gradient transition region 3 are both 10-50 μm, and both have been surface treated with γ-methacryloyloxypropyltrimethoxysilane (KH570).

[0025] like Figure 3 and Figure 4As shown, this embodiment also includes a mold for preparing the surface structure of the conveyor belt. The mold includes a first mold 6 for forming the raised area 4 of the high raised unit 1 and the raised area 4 of the low raised unit 2, and a second mold 7 for cooperating with the first mold 6 to form the root area 5 of the high raised unit 1, the root area 5 of the low raised unit 2 and the gradient transition area 3. The second mold 7 is located inside the first mold 6 and is detachably connected to the first mold 6. The second mold 7 is provided with mold holes corresponding to the root region 5 of the high protrusion unit 1, the root region 5 of the low protrusion unit 2, and the gradient transition region 3, respectively.

[0026] like Figure 5 As shown, this embodiment also includes a method for preparing a conveyor belt surface structure, comprising the following steps: S1. Prepared using CNC engraving technology, such as Figure 2 and Figure 3 The mold shown is adapted to the high-protrusion unit 1, the low-protrusion unit 2, and the gradient transition zone 3; then, a high-temperature resistant fluorocarbon release agent is sprayed into the mold, and the mold is preheated to 80-100℃ to reduce material shrinkage and deformation during injection molding. S2. After thoroughly stirring and vacuum degassing the pure polydimethylsiloxane, inject it into the mold cavity corresponding to the raised area 4 of the high raised unit 1. Then, keep it at 80-100℃ for 15 minutes to pre-cur it, so that the pure polydimethylsiloxane in the raised area 4 of the high raised unit 1 is initially shaped. S3. Pure polydimethylsiloxane and silica particles are simultaneously injected into the mold cavity corresponding to the raised region 4 of the low-protrusion unit 2. Then, the mixture of the low-protrusion unit 2 and raised region 4 is hot-pressed. The process includes: Under a pressure of 0.3-0.5MPa, a dense filling structure is formed, and the temperature is simultaneously raised to 70℃ to initially solidify the mixture of low-protrusion unit 2 and protrusion region 4. S4. Simultaneously perform injection molding operations on the root region 5 of the high-protrusion unit 1, the root region 5 of the low-protrusion unit 2, and the gradient transition zone 3. This step specifically includes: S4-1. First, insert the second mold 7 into the mold cavity of the first mold 6 corresponding to the root region 5 of the high protrusion unit 1, the root region 5 of the low protrusion unit 2, and the gradient transition region 3. S4-2. Inject pure polydimethylsiloxane into the mold cavity corresponding to the root region 5 of the high protrusion unit 1 (i.e., into the mold hole of the second mold 7 corresponding to the root region 5 of the high protrusion unit 1). S4-3. Pure polydimethylsiloxane and silica particles are simultaneously injected into the mold cavity of the root region 5 of the low protrusion unit 2 (i.e., the mold hole of the second mold 7 corresponding to the root region 5 of the low protrusion unit 2), and the silica particles are injected uniformly. S4-4. Pure polydimethylsiloxane and silica particles are simultaneously injected into the mold cavity corresponding to the gradient transition zone 3 of the mold (i.e., the mold hole corresponding to the gradient transition zone 3 of the second mold 7), and the silica particles are injected in a linearly increasing manner from the high protrusion unit 1 to the low protrusion unit 2.

[0027] After the injection molding operations of S4-5, the root region 5 of the high protrusion unit 1, the root region 5 of the low protrusion unit 2, and the gradient transition region 3 are completed, the second mold 7 is removed from the first mold 6, and the material of the gradient transition region 3 is naturally integrated with the material of the root region 5 of the adjacent high protrusion unit 1 and the material of the root region 5 of the low protrusion unit 2.

[0028] S5. Curing in one piece at 60-80℃ for 1-2 hours, then demolding to obtain the finished product.

[0029] The specific process for this step is as follows: The molded part is transferred to a low-temperature curing zone for stepped cooling: from 80℃ to 60℃, taking 1-2 hours, to eliminate internal stress in the material; then demolding is performed: after cooling to 40℃, the part is demolded to obtain a finished structure with high and low protrusions on the surface; finally, the function is enhanced: the surface of the high protrusion unit 1 is subjected to plasma activation treatment and sprayed with a nano-scale hydrophobic coating with a contact angle >150°.

[0030] The above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, any changes made in accordance with the shape and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A conveyor belt surface structure, characterized in that, It includes high-protrusion units, low-protrusion units, and gradient transition regions; The high-protrusion units and low-protrusion units are distributed at intervals, and both include a protrusion region and a root region. The gradient transition region connects the root region of the high-protrusion unit and the root region of the low-protrusion unit. The high-protrusion unit is composed of pure polydimethylsiloxane; The low-protrusion unit and the gradient transition region are both composed of pure polydimethylsiloxane and silica particles. The silica particle content in the gradient transition region increases linearly from the high-protrusion unit to the low-protrusion unit.

2. The conveyor belt surface structure according to claim 1, characterized in that, The curves on the surfaces of the high-protrusion unit and the low-protrusion unit are both linear. in, The curve of the highly protruding unit surface satisfies: y = 5sin(2x + π); The curve of the low-protrusion unit surface satisfies: y = 2*sin(2*x).

3. The conveyor belt surface structure according to claim 1, characterized in that, The elastic modulus of the high-protrusion unit is 0.3-0.8 MPa; The mass fraction of silica particles in the low-protrusion unit is 30%-60%, and the elastic modulus is 5-15 MPa.

4. The conveyor belt surface structure according to claim 1, characterized in that, The silica particle content in the gradient transition region increases linearly from high-protrusion units to low-protrusion units, from 0% to 30%.

5. The conveyor belt surface structure according to claim 1, characterized in that, The particle size of the silica particles in the low-protrusion unit and the silica particles in the gradient transition zone are both 10-50 μm, and both have undergone surface treatment with γ-methacryloyloxypropyltrimethoxysilane.

6. A mold for preparing the surface structure of the conveyor belt according to any one of claims 1-5, characterized in that, It includes a first mold for molding the raised area of ​​the high-raised unit and the raised area of ​​the low-raised unit, and a second mold for cooperating with the first mold to mold the root area of ​​the high-raised unit, the root area of ​​the low-raised unit, and the gradient transition area. The second mold is disposed inside the first mold and is detachably connected to the first mold. The second mold is provided with mold holes corresponding to the root region of the high protrusion unit, the root region of the low protrusion unit, and the gradient transition region, respectively.

7. A method for preparing the surface structure of a conveyor belt according to any one of claims 1-5, characterized in that, include: Prepare molds that are compatible with high-protrusion units, low-protrusion units, and gradient transition regions; Pure polydimethylsiloxane is injected into the mold cavity of the corresponding high-protrusion unit protrusion area; Pure polydimethylsiloxane and silica particles are simultaneously injected into the mold cavity of the corresponding low-protrusion unit protrusion area. Simultaneously perform injection molding operations on the root region of high-protrusion units, the root region of low-protrusion units, and the gradient transition zone. The product is cured in one piece at 60-80℃ for 1-2 hours, and then demolded to obtain the finished product.

8. The method for preparing a conveyor belt surface structure according to claim 7, characterized in that, Simultaneously perform injection molding operations on the root region of high-protrusion elements, the root region of low-protrusion elements, and the gradient transition zone, including: Pure polydimethylsiloxane is injected into the mold cavity corresponding to the root region of the high-protrusion unit. Pure polydimethylsiloxane and silica particles are simultaneously injected into the mold cavity of the corresponding low-protrusion unit root area, and the silica particles are injected uniformly. Pure polydimethylsiloxane and silica particles are simultaneously injected into the mold cavity of the corresponding gradient transition zone of the mold, and the silica particles are injected in a linearly increasing manner from the high-protrusion unit to the low-protrusion unit.

9. The method for preparing a conveyor belt surface structure according to claim 7, characterized in that, The prepared mold includes a first mold for forming the raised area of ​​the high protrusion unit and the raised area of ​​the low protrusion unit, and a second mold for cooperating with the first mold to form the root area of ​​the high protrusion unit, the root area of ​​the low protrusion unit, and the gradient transition area; the second mold is disposed inside the first mold and is detachably connected to the first mold, and the second mold is provided with mold holes corresponding to the root area of ​​the high protrusion unit, the root area of ​​the low protrusion unit, and the gradient transition area respectively; Before simultaneously performing injection molding operations on the root region of the high-protrusion unit, the root region of the low-protrusion unit, and the gradient transition zone, the second mold is first installed into the mold cavity of the first mold corresponding to the root region of the high-protrusion unit, the root region of the low-protrusion unit, and the gradient transition zone. After the injection molding operations of the root region of the high-protrusion unit, the root region of the low-protrusion unit, and the gradient transition zone are completed, the second mold is removed from the first mold, and the material of the gradient transition zone is naturally fused with the material of the root region of the adjacent high-protrusion unit and the material of the root region of the low-protrusion unit.

10. The method for preparing a conveyor belt surface structure according to claim 7, characterized in that, After preparing the mold, spray a high-temperature resistant fluorocarbon release agent into the mold and preheat the mold to 80-100℃ to reduce material shrinkage and deformation during injection molding. Before injecting pure polydimethylsiloxane into the raised area of ​​the mold corresponding to the high-raised unit, the pure polydimethylsiloxane is thoroughly stirred and vacuum degassed; after the pure polydimethylsiloxane is injected into the raised area of ​​the mold corresponding to the high-raised unit, it is kept at 80-100℃ for 15 minutes for pre-curing, so that the pure polydimethylsiloxane in the raised area of ​​the high-raised unit is initially shaped. After simultaneously injecting pure polydimethylsiloxane and silica particles into the raised area of ​​the corresponding low-protrusion unit in the mold, the mixture of the low-protrusion unit raised area is hot-pressed. The process includes: Under a pressure of 0.3-0.5MPa, a dense filling structure is formed, and the temperature is simultaneously raised to 70℃ to initially solidify the mixture in the raised area of ​​the low-protrusion unit. The integrated curing process includes: The molded part is transferred to a low-temperature curing zone for stepped cooling: from 80℃ to 60℃, taking 1-2 hours, to eliminate internal stress in the material; then demolding is performed: after cooling to 40℃, the part is demolded to obtain a finished structure with high and low protrusions on the surface; finally, the function is enhanced: the surface of the high protrusion unit is subjected to plasma activation treatment and sprayed with a nano-scale hydrophobic coating with a contact angle >150°.

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