Hot pressing die for forming starch meal box
By using the buffer limit coordination between the buffer spring and the baffle in the hot pressing mold and real-time data detection and adjustment of the control components, the problems of unstable and unqualified lunch box molding in the prior art are solved, and an efficient and stable lunch box molding process is achieved.
Patent Information
- Application Number
- CN202510114024.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-24
- Publication Date
- 2025-04-11
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
When forming starch lunch boxes, it is difficult to achieve stable disengagement and efficient molding of existing hot press molds, resulting in inconsistent product shape, inaccurate dimensional accuracy, and poor mechanical properties.
A hot press mold for forming starch lunch boxes is designed, using a buffer spring and a buffer limit fit between the baffle to ensure that the upper mold is stable to tighten the hot press material, and the pressure and temperature data are detected and adjusted in real time through the control components to automatically adjust the hot press time.
It realizes stable and rapid separation of lunch box-formed products, improves product production stability and quality consistency, and ensures accurate product shape, high dimensional accuracy and excellent mechanical performance.
Smart Images
Figure CN119795462A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of lunch box forming moulds, in particular to a hot pressing mould for forming starch lunch boxes. Background Art
[0002] Lunch boxes are one of the most widely used daily necessities in human life. Lunch boxes can be divided into two types according to the number of times they are used: disposable and reusable. The former are generally divided into plastic lunch boxes and paper lunch boxes. Among them, starch lunch boxes are easy to degrade and are beneficial to environmental protection.
[0003] The existing hot pressing molded products are mostly connected to the hot pressing materials. However, due to the changes in the raised cavities on the lunch boxes, it is difficult for ordinary hydraulic trimming machines to squeeze and cut the materials smoothly, and a specific supporting mold is required for support, which makes the separation of the lunch box molded products a hassle. In addition, the separated lunch box molded products are easy to fall over and scatter during mobile transportation, which is not convenient for stacking. Therefore, a post-processing process is required, which seriously affects the work efficiency. In the prior art, the pressure and temperature change during the hot pressing process. The changes in pressure and temperature will cause the actual required hot pressing time to be longer than the preset hot pressing time. If the preset hot pressing time is used to perform the operation, the hot pressing material will not be able to fully flow and fill the mold cavity, and the product will be partially short of material, resulting in the shape of the product not being consistent with the design and the dimensional accuracy failing to meet the requirements. In addition, due to insufficient hot pressing time, the molecules inside the hot pressing material do not have enough time to rearrange in the mold, resulting in large differences in density in different parts of the product. In areas with low density, the mechanical properties of the product, such as strength and stiffness, will be significantly reduced, affecting the quality and performance of the product. Therefore, the present application designs a hot pressing mold for molding starch lunch boxes to solve the above problems. Summary of the invention
[0004] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a hot pressing mold for molding a starch lunch box.
[0005] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: a hot pressing mold for forming a starch lunch box, comprising an upper mold and a lower mold, a buffer push seat is arranged above the upper mold, four guide rods are symmetrically arranged at the upper end of the upper mold, guide holes for penetrating the four guide rods are opened on the buffer push seat, four guide posts are symmetrically arranged on the lower mold, and four guide ear blocks for cooperating with the guide posts are convexly arranged on the side ends of the buffer push seat; A control component is also arranged inside the control box of the hot pressing mold, and the control component includes a collection module, an analysis module and an adjustment module; The acquisition module detects the pressure data and temperature data at various positions inside the mold cavity during the hot pressing process, and transmits the detected pressure data and temperature data to the analysis module; The analysis module processes and analyzes the pressure data and temperature data transmitted by the acquisition module, determines the influence of the changes of the pressure data and the temperature data on the speed of hot pressing during the hot pressing process, generates an adjustment signal according to the time difference of the hot pressing speed, and transmits the adjustment signal to the regulation module; The regulating module receives the adjusting signal transmitted by the analyzing module and adjusts the hot pressing time according to the time difference value in the adjusting signal.
[0006] Preferably, buffer springs are sleeved in the four guide rods, and the buffer springs are located between the upper mold and the buffer push seat. Inverted L-shaped baffles are symmetrically provided on both sides of the upper mold, and the buffer push seat is located between the protruding end of the baffle and the upper mold.
[0007] Preferably, a plurality of convex hot pressing templates are equidistantly arranged on the bottom surface of the upper mold, a plurality of concave hot pressing templates cooperating with the convex hot pressing templates are equidistantly arranged on the top surface of the lower mold, and two lifting demoulding boxes are symmetrically arranged on both sides of the lower mold.
[0008] Preferably, a plurality of perforation grooves are evenly spaced on the upper mold around the convex hot pressing template, and a plurality of perforation protrusions for penetrating into the perforation grooves are evenly spaced on the lower mold around the concave hot pressing template.
[0009] Preferably, a top block is slidably provided in the jacking and demoulding box, and four jacking springs are equidistantly provided at the lower end of the top block, and the four jacking springs are placed in the jacking and demoulding box.
[0010] Preferably, a round chamfer is provided on the top edge of the top block, and a plurality of movable balls are rotatably provided on the top surface of the top block.
[0011] Preferably, the analysis module performs the following steps to determine the effect of pressure on the speed of hot pressing: Step 1: When the mold applies pressure to the hot-pressed material, the hot-pressed material will undergo elastic deformation. The deformation amount of the hot-pressed material under the pressure is , is the elastic modulus of the hot pressed material, is the contact area between the mold and the hot pressing material, is Poisson's ratio, is the hot pressing pressure data, is the initial thickness data of the hot pressed material; Step 2: Shear stress of power-law fluid With shear rate The relationship between , is the consistency coefficient, is the flow behavior index; in pressure-driven flow, the preset pressure gradient is , then in the thickness direction The velocity distribution on , is the length in the flow direction, the instantaneous thickness of the hot pressed material under pressure ; Step 3: The volume of the mold cavity is , obtain the velocity data of the hot pressing material at various locations in the thickness direction, calculate the mean of the obtained velocity data, and obtain the average flow velocity , then the filling time ; Step 4: Sort the pressure data detected at the same time according to the size of the pressure data, and number the X pressure data. The sorting number is and The pressure data at the positions are recorded as and , , set the fluctuation range of the detection pressure data to , mark the pressure data that is not within the set fluctuation range as an outlier, and after removing the outliers, calculate the mean of the remaining pressure data, and record the calculated pressure mean as the pressure data at the corresponding detection time; Step 5: Eliminate abnormal values from all pressure data during the entire detection period, then calculate the average pressure value and substitute the calculated average pressure value into the filling time. The required hot pressing time under the actual pressure is calculated from the relationship , and the required hot pressing time under the actual pressure The required hot pressing time under the standard pressure data For comparison, if , it is determined that the hot pressing time is insufficient, an adjustment signal 1 is generated, and the adjustment signal 1 is transmitted to the regulating module.
[0012] Preferably, the analysis module performs the following steps to determine the effect of temperature on the speed of hot pressing: Step 1: Viscosity of hot pressed material With temperature The relationship is , is the pre-factor related to the hot pressing material, is the flow activation energy of the hot pressed material, is the ideal gas constant, is the absolute temperature; during the hot pressing process, the flow rate of the material Viscosity The relationship is , the time required for material to fill the mold ; Step 2: Eliminate abnormal values from all temperature data during the entire detection period, then calculate the average temperature value and substitute the calculated average temperature value into the filling time. The required hot pressing time under the actual temperature is calculated from the relationship , and the required hot pressing time under the actual temperature The required hot pressing time under the standard temperature data For comparison, if , it is determined that the hot pressing time is insufficient, an adjustment signal 2 is generated, and the adjustment signal 2 is transmitted to the regulating module.
[0013] Preferably, the steps of operating the adjustment module are as follows: Step 1: If the received signal is adjustment signal 1, when the hot pressing time is reached After that, the hot pressing time is extended time, ; Step 2: If the received signal is adjustment signal 2, when the hot pressing time is reached After that, the hot pressing time is extended time, .
[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The buffer spring and the baffle cooperate with each other to facilitate the upper mold to stably press the hot pressing material for hot pressing, thereby improving the production stability of the product, and thus realizing the function of buffering and stabilizing hot pressing. The perforation groove and the perforation protrusion cooperate with each other to facilitate puncturing separation holes around the lunch box formed product, thereby improving the stability of disassembly of the lunch box formed product, and thus realizing the function of stable and rapid separation of the lunch box formed product, and finally solving the problem of difficulty in separating the hot pressing lunch box mold product. 2. The pressure and temperature data at various positions inside the mold cavity during the hot pressing process are detected through the control component, and the influence of pressure and temperature changes on the speed of hot pressing molding is determined. Then, the hot pressing molding time is adjusted according to the time difference of the hot pressing molding speed. The hot pressing time is automatically adjusted according to the actual situation to ensure the stability of the hot pressing process and the consistency of product quality, effectively solving the problem of product quality being affected by changes in the actual required hot pressing time due to changes in pressure and temperature. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a schematic diagram of the overall three-dimensional structure proposed by the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the upper mold proposed by the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the lower mold proposed by the present invention; Figure 4 This is a schematic diagram of the structure of the lifting demoulding box proposed by the present invention; Figure 5 It is a system flow chart of the present invention.
[0016] Serial numbers in the figure: 1. upper mold; 2. lower mold; 3. buffer push seat; 4. convex hot pressing template; 5. perforated groove; 6. buffer spring; 7. baffle; 8. guide column; 9. lifting demoulding box; 10. concave hot pressing template; 11. perforated convex block; 12. lift block; 13. lifting spring; 14. movable ball. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.
[0018] Example: See Figure 1-5The hot pressing mold for forming starch lunch boxes in the present invention comprises an upper mold 1 and a lower mold 2. A buffer push seat 3 is provided above the upper mold 1. Four guide rods are symmetrically provided at the upper end of the upper mold 1. The buffer push seat 3 is provided with guide holes for penetrating the four guide rods. Four guide posts 8 are symmetrically provided on the lower mold 2. Four guide ear blocks for matching the guide posts 8 are convexly provided at the side ends of the buffer push seat 3. Through the arrangement of the guide posts 8 and the guide ear blocks, the upper mold 1 and the lower mold 2 can be better slid, thereby ensuring the stability of the hot pressing mold. The four guide rods are all sleeved with There is a buffer spring 6, which is located between the upper mold 1 and the buffer push seat 3. Inverted L-shaped baffles 7 are symmetrically arranged on both sides of the upper mold 1. The buffer push seat 3 is located between the protruding end of the baffle 7 and the upper mold 1. Through the arrangement of the buffer spring 6 and the baffle 7, the upper mold 1 can be better driven to slide up and down, and the material is first pressed and then hot-pressed during hot pressing, so that the hot-pressed material is more stable and the yield rate of the hot-pressed product is improved; a plurality of convex hot-pressing templates 4 are equidistantly arranged on the bottom surface of the upper mold 1, and a plurality of concave hot-pressing templates 10 that match the convex hot-pressing templates 4 are equidistantly arranged on the top surface of the lower mold 2. Two lifting demoulding boxes 9 are symmetrically arranged on both sides of the lower mold 2. Through the arrangement of the convex hot pressing template 4 and the concave hot pressing template 10, it is possible to better conduct heat to the hot pressing part by electric heating, thereby reducing heat loss; a number of perforation grooves 5 are evenly spaced on the upper mold 1 around the convex hot pressing template 4, and a number of perforation protrusions 11 for penetrating the perforation grooves 5 are evenly spaced on the lower mold 2 around the concave hot pressing template 10. The arrangement of the perforation grooves 5 and the perforation protrusions 11 can provide a guide for the positioning of the mold, and evenly spaced through holes are opened around the product. , which is convenient for the separation of the product from the hot-pressed material; a top block 12 is slidably provided in the jacking demoulding box 9, and four jacking springs 13 are equidistantly provided at the lower end of the top block 12. The four jacking springs 13 are placed in the jacking demoulding box 9. Through the setting of the jacking springs 13, the product can be ejected from the mold through the protrusion of the top block 12 after the hot pressing is completed; a round chamfer is provided on the top edge of the top block 12, and a plurality of movable balls 14 are rotatably provided on the top surface of the top block 12. Through the setting of the top block 12 and the movable balls 14, the hot-pressed material can pass through the mold more smoothly, thereby reducing the friction between the hot-pressed material and the mold.
[0019] A control component is also arranged inside the control box of the hot pressing mold, and the control component includes a collection module, an analysis module and an adjustment module; When the upper mold 1 and the lower mold 2 are close to each other to perform hot pressing molding on the hot pressing material, when pressure is applied to the hot pressing material, the hot pressing material will undergo elastic deformation. , is the elastic modulus of the hot pressed material, is the contact area between the mold and the hot pressing material, is Poisson's ratio, is the hot pressing pressure data, is the initial thickness data of the hot pressed material; The speed of hot pressing is related to the flow rate of the hot pressing material. The flow of hot pressing material under pressure can be described by the power law fluid model. The shear stress of the power law fluid With shear rate The relationship between , is the consistency coefficient, is the flow behavior index; in pressure-driven flow, the preset pressure gradient is , then in the thickness direction The velocity distribution on , is the length in the flow direction, the instantaneous thickness of the hot pressed material under pressure ; The speed of hot pressing can be determined by the time it takes for the sheet material to fill the mold cavity. The volume of the mold cavity is measured by , obtain the velocity data of the hot pressing material at various locations in the thickness direction, calculate the mean of the obtained velocity data, and obtain the average flow velocity , then the filling time ; During the hot pressing operation, the pressure data at various positions inside the mold cavity are detected, the pressure data detected at the same time are sorted according to the size of the pressure data, and the X pressure data are numbered, and the sorting number is taken as and The pressure data at the positions are recorded as and , , set the fluctuation range of the detection pressure data to , mark the pressure data that is not within the set fluctuation range as an outlier, and after removing the outliers, calculate the mean of the remaining pressure data, and record the calculated pressure mean as the pressure data at the corresponding detection time; then remove the outliers for all the pressure data in the entire detection period, and then calculate the average pressure value, and substitute the calculated average pressure value into the filling time The required hot pressing time under the actual pressure is calculated from the relationship , and the required hot pressing time under the actual pressure The required hot pressing time under the standard pressure data For comparison, if , it is determined that the hot pressing time is insufficient. After, extend time, .
[0020] Temperature has a significant effect on the thermoplasticity of hot-pressed materials, and the viscosity of hot-pressed materials With temperature The relationship is , is the pre-factor related to the hot pressing material, is the flow activation energy of the hot pressed material, is the ideal gas constant, is the absolute temperature; during the hot pressing process, the flow rate of the material Viscosity The relationship is , the time required for material to fill the mold ; All temperature data in the entire detection period are subjected to outlier elimination operation, and then the average temperature value is calculated, and the calculated average temperature value is substituted into the filling time. The required hot pressing time under the actual temperature is calculated from the relationship , and the required hot pressing time under the actual temperature The required hot pressing time under the standard temperature data For comparison, if , it is determined that the hot pressing time is insufficient. After, extend time, .
[0021] Working principle: when the present invention is used, the mold is first installed on the hot pressing device, and the hot pressing template is powered on, then the hot pressing material is passed through the mold and a transmission device is installed for the hot pressing material, and then the hot pressing device is started, so that the upper mold 1 and the lower mold 2 are close to each other, and the upper mold 1 first fits the hot pressing material, and then slowly approaches the lower mold 2 and presses the hot pressing material under the action of the buffer spring 6, and at the same time, the top block 12 of the lifting demolding box 9 is pushed back into the device, and then the upper mold 1 is completely pressed down, and the upper mold 1 starts to rise after staying for a period of time. When the upper mold 1 and the lower mold 2 are hot pressed, the hot pressing template is electrically heated to increase the temperature of the hot pressing template. The setting of the lifting spring 13 can eject the product out of the mold through the protrusion of the top block 12 after the hot pressing is completed. The setting of the top block 12 and the movable ball 14 enables the hot pressing material to pass through the mold more smoothly, reducing the friction between the hot pressing material and the mold. Finally, the upper mold 1 is separated from the lower mold 2, and the use of the hot pressing mold is terminated.
[0022] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A hot pressing mold for forming a starch lunch box, comprising an upper mold (1) and a lower mold (2), characterized in that: A buffer push seat (3) is provided above the upper mold (1), four guide rods are symmetrically provided at the upper end of the upper mold (1), and guide holes for passing the four guide rods are opened on the buffer push seat (3), and four guide posts (8) are symmetrically provided on the lower mold (2), and four guide ear blocks for matching the guide posts (8) are protruding from the side ends of the buffer push seat (3); A control component is also arranged inside the control box of the hot pressing mold, and the control component includes a collection module, an analysis module and an adjustment module; The acquisition module detects the pressure data and temperature data at various positions inside the mold cavity during the hot pressing process, and transmits the detected pressure data and temperature data to the analysis module; The analysis module processes and analyzes the pressure data and temperature data transmitted by the acquisition module, determines the influence of the changes of the pressure data and the temperature data on the speed of hot pressing during the hot pressing process, generates an adjustment signal according to the time difference of the hot pressing speed, and transmits the adjustment signal to the regulation module; The regulating module receives the adjusting signal transmitted by the analyzing module and adjusts the hot pressing time according to the time difference value in the adjusting signal.
2. The hot pressing mold for forming starch lunch boxes according to claim 1, characterized in that: The four guide rods are all sleeved with a buffer spring (6), and the buffer spring (6) is located between the upper mold (1) and the buffer push seat (3). Inverted L-shaped baffles (7) are symmetrically provided on both sides of the upper mold (1), and the buffer push seat (3) is located between the protruding end of the baffle (7) and the upper mold (1).
3. The hot pressing mold for forming starch lunch boxes according to claim 2, characterized in that: The bottom surface of the upper mold (1) is provided with a plurality of convex hot pressing mold plates (4) at equal intervals, the top surface of the lower mold (2) is provided with a plurality of concave hot pressing mold plates (10) that match the convex hot pressing mold plates (4) at equal intervals, and two lifting demoulding boxes (9) are symmetrically provided on both sides of the lower mold (2).
4. The hot pressing mold for forming starch lunch boxes according to claim 3, characterized in that: The upper mold (1) around the convex hot pressing template (4) is provided with a plurality of perforation grooves (5) at equal intervals, and the lower mold (2) around the concave hot pressing template (10) is provided with a plurality of perforation protrusions (11) at equal intervals for penetrating into the perforation grooves (5).
5. The hot pressing mold for forming starch lunch boxes according to claim 4, characterized in that: A top block (12) is slidably provided in the jacking and demoulding box (9), and four jacking springs (13) are equidistantly provided at the lower end of the top block (12), and the four jacking springs (13) are placed in the jacking and demoulding box (9).
6. The hot pressing mold for forming starch lunch boxes according to claim 5, characterized in that: The top edge of the top block (12) is provided with a rounded chamfer, and a plurality of movable balls (14) are rotatably provided on the top surface of the top block (12).
7. The hot pressing mold for forming starch lunch boxes according to claim 6, characterized in that: The analysis module determines the effect of pressure on the speed of hot pressing as follows: Step 1: When the mold applies pressure to the hot-pressed material, the hot-pressed material will undergo elastic deformation. The deformation amount of the hot-pressed material under the pressure is , is the elastic modulus of the hot pressed material, is the contact area between the mold and the hot pressing material, is Poisson's ratio, is the hot pressing pressure data, is the initial thickness data of the hot pressed material; Step 2: Shear stress of power-law fluid With shear rate The relationship between , is the consistency coefficient, is the flow behavior index; in pressure-driven flow, the preset pressure gradient is , then in the thickness direction The velocity distribution on , is the length in the flow direction, the instantaneous thickness of the hot pressed material under pressure ; Step 3: The volume of the mold cavity is , obtain the velocity data of the hot pressing material at various locations in the thickness direction, calculate the mean of the obtained velocity data, and obtain the average flow velocity , then the filling time ; Step 4: Sort the pressure data detected at the same time according to the size of the pressure data, and number the X pressure data. The sorting number is and The pressure data at the positions are recorded as and , , set the fluctuation range of the detection pressure data to , mark the pressure data that is not within the set fluctuation range as an outlier, and after removing the outliers, calculate the mean of the remaining pressure data, and record the calculated pressure mean as the pressure data at the corresponding detection time; Step 5: Eliminate abnormal values from all pressure data during the entire detection period, then calculate the average pressure value and substitute the calculated average pressure value into the filling time. The required hot pressing time under the actual pressure is calculated from the relationship , and the required hot pressing time under the actual pressure The required hot pressing time under the standard pressure data For comparison, if , it is determined that the hot pressing time is insufficient, an adjustment signal 1 is generated, and the adjustment signal 1 is transmitted to the regulating module.
8. The hot pressing mold for forming starch lunch boxes according to claim 7, characterized in that: The analysis module determines the effect of temperature on the speed of hot pressing as follows: Step 1: Viscosity of hot pressed material With temperature The relationship is , is the pre-factor related to the hot pressing material, is the flow activation energy of the hot pressed material, is the ideal gas constant, is the absolute temperature; during the hot pressing process, the flow rate of the material Viscosity The relationship is , the time required for material to fill the mold ; Step 2: Eliminate abnormal values from all temperature data during the entire detection period, then calculate the average temperature value and substitute the calculated average temperature value into the filling time. The required hot pressing time under the actual temperature is calculated from the relationship , and the required hot pressing time under the actual temperature The required hot pressing time under the standard temperature data For comparison, if , it is determined that the hot pressing time is insufficient, an adjustment signal 2 is generated, and the adjustment signal 2 is transmitted to the regulating module.
9. The hot pressing mold for forming starch lunch boxes according to claim 8, characterized in that: The steps for the adjustment module to perform operations are as follows: Step 1: If the received signal is adjustment signal 1, when the hot pressing time is reached After that, the hot pressing time is extended time, ; Step 2: If the received signal is adjustment signal 2, when the hot pressing time is reached After that, the hot pressing time is extended time, .