Acrylic plate bending device

Abstract

The invention relates to an acrylic plate bending device, and belongs to the field of acrylic plate processing, the acrylic plate bending device comprises a bending assembly, a forming assembly and a natural air cooling assembly, the bending assembly is used for bending an acrylic plate, and the forming assembly is used for shaping the bent acrylic plate; and the natural air cooling assembly is used for cooling when the bent acrylic plate is shaped by the forming assembly. The invention has the advantages that: 1, the original characteristics and light transmission of the acrylic plate are effectively retained in the secondary processing process of the acrylic plate, so that the light transmission is more uniform, and the problems of concave-convex pits and the like on the bent surface are avoided; 2, the size of the formed acrylic is more accurate through the optimized forming process, the dimensional tolerance can be controlled to be smaller than or equal to 0.3 mm, and application in product design is more convenient.

Description

Technical Field

[0001] The invention relates to an acrylic plate bending device and belongs to the field of acrylic plate processing. Background Art

[0002] Acrylic, also known as organic glass, has a higher light transmittance than traditional glass, is easy to mold and form, and can still maintain a high surface transparency after forming, and is richer in color. Because of its high light transmittance, various colors can be screen-printed on the bottom of acrylic without color cast, showing the true effect of color. The characteristics of acrylic sheets make them widely used in the field of life, and they can effectively increase the beauty of products, but existing acrylic sheets are usually formed in one step. If acrylic sheets are processed for secondary processing, they are generally limited to cutting and engraving.

[0003] There are two major difficulties when bending acrylic sheets: 1. The transmittance of the R angle after bending is relatively uneven, and it is easy to have bending creases. 2. The dimensional tolerance after bending is difficult to control. Generally, the bending process control tolerance is >0.5mm. Summary of the invention

[0004] In order to overcome the defects of the prior art, the present invention provides an acrylic plate bending device, and the technical solution of the present invention is:

[0005] An acrylic plate bending device comprises a bending component, a molding component and a natural wind cooling component, wherein the bending component is used for bending the acrylic plate, the molding component is used for shaping the bent acrylic plate; and the natural wind cooling component is used for cooling the bent acrylic plate when the molding component shapes the bent acrylic plate.

[0006] The bending assembly includes a first workbench, a first heating tube and a first heating tube mounting bracket. Several first heating tube mounting brackets are installed at a position close to the first workbench, and the first heating tube is installed on each of the first heating tube mounting brackets. When the acrylic plate is placed on the first workbench, the first heating tube is close to the natural bending point of the acrylic plate.

[0007] The molding assembly includes a frame, a left molding upper mold frame, a right molding upper mold frame, a molding lower mold frame, a second heating tube and a second heating tube mounting frame. The molding lower mold frame, the left molding upper mold frame, the right molding upper mold frame and the second heating tube mounting frame are installed on the frame. The left molding upper mold frame is installed on the upper part of one side of the molding lower mold frame, and the right molding upper mold frame is installed on the upper part of the other side of the molding lower mold frame. The right molding upper mold frame and the left molding upper mold frame are symmetrically arranged along the molding lower mold frame; a bending molding space is formed between the right molding upper mold frame and the molding lower mold frame, and between the left molding upper mold frame and the molding lower mold frame bracket; the second heating tube is installed on the second heating tube mounting frame, and each of the second heating tubes is close to the bending molding part of the acrylic plate.

[0008] The left upper forming mold frame and the right upper forming mold frame have the same structure, both of which include a transverse pressing plate and a vertical pressing plate integrally formed with the transverse pressing plate, and the space between the transverse pressing plate and the vertical pressing plate forms the bending forming space.

[0009] The left upper molding die frame and the right upper molding die frame are both installed on the frame through a moving assembly, and the moving assembly includes an X-direction moving mechanism and a Y-direction moving mechanism. The Y-direction moving mechanism is installed on the X-direction moving mechanism and moves in the horizontal direction with the X-direction moving mechanism; the X-direction moving mechanism is used to drive the left upper molding die frame or the right upper molding die frame in the horizontal direction; the Y-direction moving mechanism is used to drive the left upper molding die frame or the right upper molding die frame in the vertical direction.

[0010] The natural wind cooling assembly is arranged on the outer sides of the left upper molding mold frame and the right upper molding mold frame, and the air outlet of the natural wind cooling assembly faces the bending molding space.

[0011] An arc-shaped chamfered area is formed on the lower forming mold frame near the bending forming portion of the acrylic plate.

[0012] When the acrylic plate on the lower molding mold frame is bent, the step of edge detection of the acrylic plate is also included, which is specifically:

[0013] 1.1 Noise elimination: Use an industrial camera to collect images of acrylic plates, and apply a Gaussian filter to the collected images to smooth the images to reduce the noise in the images;

[0014] 1.2 Calculate the gradient magnitude: Use the Sobel operator to calculate the gradient magnitude and direction of the image, where the gradient magnitude represents the strength of the edge and the gradient direction represents the direction of the edge;

[0015] 1.3 Non-maximum suppression: In the gradient direction, the gradient magnitude of each pixel is checked. If the gradient magnitude of the pixel is not the local maximum, it is set to zero. This step helps to refine the edge, making it finer and more precise.

[0016] 1.4 Dual threshold detection: Select two thresholds, a high threshold and a low threshold. The high threshold is used to detect strong edges, and the low threshold is used to detect weak edges. Pixels of strong edges are retained, and pixels of weak edges are retained based on whether they are connected to strong edges; 1.5 Edge tracking: Starting from strong edge pixels, track the edges until they meet another strong edge pixel or the image boundary; this step helps to connect edge fragments and form continuous edges.

[0017] 1.6 Edge refinement: The edge detected by dual threshold is refined into a one-pixel wide curve to improve the accuracy of edge detection.

[0018] The advantages of the present invention are:

[0019] 1. The original characteristics and light transmittance of the acrylic sheet are effectively retained during the secondary processing, making the light transmittance more uniform and without problems such as bumps and pits on the bending surface.

[0020] 2. The optimized forming process makes the size of acrylic more precise after forming, and the dimensional tolerance can be controlled within ≤0.3mm, which is more convenient to use in product design. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the main structure when the acrylic plate of the present invention is placed on a bending component.

[0022] Figure 2 It is a schematic structural diagram of the acrylic plate of the present invention when it is placed on a forming component.

[0023] Figure 3 It is a schematic diagram of the structure of the acrylic board of the present invention when it is bent and formed on a forming component. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with specific embodiments, and the advantages and features of the present invention will become clearer as the description proceeds. However, these embodiments are exemplary only and do not constitute any limitation to the scope of the present invention. It should be understood by those skilled in the art that the details and forms of the technical solution of the present invention may be modified or replaced without departing from the spirit and scope of the present invention, but these modifications and replacements all fall within the scope of protection of the present invention.

[0025] See also Figures 1 to 3The present invention relates to an acrylic plate bending device, comprising a bending component, a molding component and a natural wind cooling component, wherein the bending component is used for bending the acrylic plate, the molding component is used for shaping the bent acrylic plate; and the natural wind cooling component is used for cooling the bent acrylic plate when the molding component shapes the bent acrylic plate.

[0026] The above structure setting achieves:

[0027] Integrated design: The device integrates the three key steps of bending, forming and cooling into one system, which improves production efficiency and operation convenience.

[0028] Precise control: Through precise temperature control system and shaping components, it can ensure that the acrylic sheet reaches the expected shape and size during heating and bending, and the tolerance is controlled within ±0.3mm.

[0029] Energy-saving and high efficiency: The natural air cooling system uses ambient air for cooling, reducing dependence on traditional energy sources and reducing energy consumption.

[0030] The bending assembly includes a first workbench 6, a first heating tube 7 and a first heating tube mounting bracket. Several first heating tube mounting brackets are installed at a position close to the first workbench 6, and the first heating tube 7 is installed on each of the first heating tube mounting brackets. When the acrylic plate 4 is placed on the first workbench 6, the first heating tube 7 is close to the natural bending point of the acrylic plate.

[0031] For the bending assembly, the acrylic plate is placed above the first workbench 6, and the first heating tube 7 is placed 20 cm above the acrylic plate. In the present embodiment, there are two first heating tubes arranged in parallel. It can be understood that the number of heating tubes cannot be construed as a limitation to the present application, and those skilled in the art can adjust the number of heating tubes according to actual needs.

[0032] First workbench: When the first heating tube is working, the heat of the first heating tube heats the acrylic plate at a height of 20 cm. After 300 seconds, the acrylic plate bends naturally under the action of gravity.

[0033] The acrylic plate lifted on the first workbench flows to the second process through the automatic assembly line.

[0034] The above bending component settings achieve:

[0035] Local heating capability: The first heating tube 7 heats a specific area (natural bend) of the acrylic plate 4, which can achieve precise local heating, avoid unnecessary overall heating, and thus save energy.

[0036] Efficient heat transfer: The first heating tube 7 is installed on the first heating tube mounting frame, which can quickly and evenly transfer heat to the acrylic plate 4 to ensure the temperature consistency of the plate during the bending process.

[0037] Easy operation: The first workbench 6 provides a stable working platform for the operator, which is convenient for placing and positioning the acrylic plate 4. At the same time, the proximity design of the first heating tube 7 makes the operation easier.

[0038] Improve production efficiency: By centrally heating the natural bending part of the acrylic plate 4, the heating time can be shortened, the production rhythm can be accelerated, and the overall production efficiency can be improved.

[0039] The molding assembly includes a frame, a left molding upper mold frame 1, a right molding upper mold frame 2, a molding lower mold frame 3, a second heating tube and a second heating tube mounting frame. The molding lower mold frame 3, the left molding upper mold frame 1, the right molding upper mold frame 2 and the second heating tube mounting frame are installed on the frame. The left molding upper mold frame 1 is installed on the upper part of one side of the molding lower mold frame 3, and the right molding upper mold frame 2 is installed on the upper part of the other side of the molding lower mold frame 3. The right molding upper mold frame 2 and the left molding upper mold frame 1 are symmetrically arranged along the molding lower mold frame 3; a bending molding space is formed between the right molding upper mold frame 2 and the molding lower mold frame 3, and between the left molding upper mold frame 1 and the molding lower mold frame bracket 3; the second heating tube is installed on the second heating tube mounting frame, and each of the second heating tubes is close to the bending molding part of the acrylic plate 4.

[0040] The left upper forming mold frame has the same structure as the right upper forming mold frame, both of which include a transverse pressing plate 11 and a vertical pressing plate 12 integrally formed with the transverse pressing plate 11 , and the space between the transverse pressing plate 11 and the vertical pressing plate 12 forms the bending forming space.

[0041] The left upper forming mold frame 1 and the right upper forming mold frame 2 are both installed on the frame through a moving assembly, and the moving assembly includes an X-direction moving mechanism and a Y-direction moving mechanism. The Y-direction moving mechanism is installed on the X-direction moving mechanism and moves in the horizontal direction with the X-direction moving mechanism; the X-direction moving mechanism is used to drive the left upper forming mold frame or the right upper forming mold frame in the horizontal direction; the Y-direction moving mechanism is used to drive the left upper forming mold frame or the right upper forming mold frame in the vertical direction.

[0042] In the molding component, the specific working principle is as follows:

[0043] Action 1: The left forming upper mold frame and the right forming upper mold frame are driven by the X-axis moving mechanism to close the mold and stop at a distance of 1mm from the acrylic plate;

[0044] Action 2: The left forming upper mold frame and the right forming upper mold frame are simultaneously driven by the Y-axis moving mechanism to press down and close the mold, and stop at a position 1mm away from the top surface of the acrylic plate;

[0045] Action 3: The left forming upper mold frame and the right forming upper mold frame are simultaneously closed in the horizontal direction to be in close contact with the acrylic plate;

[0046] Action 4: After cooling for 180 seconds by the natural wind cooling components on both sides of the second workbench, the left forming upper mold frame and the right forming upper mold frame are simultaneously away from the bent acrylic sheet, and the forming lower mold frame and the acrylic sheet automatically flow to the third workbench for quality inspection.

[0047] In this embodiment, the power of the second heating tube may be between 1200 W and 2000 W. This power is the rated power, and the power is usually adjustable.

[0048] The natural wind cooling assembly 5 is arranged on the outer side of the left molding upper mold frame 1 and the right molding upper mold frame 2, and the air outlet of the natural wind cooling assembly 5 faces the bending molding space.

[0049] An arc-shaped chamfered area is formed on the lower forming mold frame near the bending forming portion of the acrylic plate.

[0050] When the acrylic plate on the lower molding mold frame 3 is bent, the step of edge detection of the acrylic plate is also included, which is specifically:

[0051] 1.1 Noise elimination: Use an industrial camera to collect images of acrylic plates, and apply a Gaussian filter to the collected images to smooth the images to reduce the noise in the images;

[0052] 1.2 Calculate the gradient magnitude: Use the Sobel operator to calculate the gradient magnitude and direction of the image, where the gradient magnitude represents the strength of the edge and the gradient direction represents the direction of the edge;

[0053] 1.3 Non-maximum suppression: In the gradient direction, the gradient magnitude of each pixel is checked. If the gradient magnitude of the pixel is not the local maximum, it is set to zero. This step helps to refine the edge, making it finer and more precise.

[0054] 1.4 Dual threshold detection: Select two thresholds, a high threshold and a low threshold. The high threshold is used to detect strong edges, and the low threshold is used to detect weak edges. Pixels of strong edges are retained, and pixels of weak edges are retained based on whether they are connected to strong edges; 1.5 Edge tracking: Starting from strong edge pixels, track the edges until they meet another strong edge pixel or the image boundary; this step helps to connect edge fragments and form continuous edges.

[0055] 1.6 Edge refinement: The edge detected by dual threshold is refined into a one-pixel wide curve to improve the accuracy of edge detection.

[0056] Adding edge detection to the acrylic sheet bending process has the following advantages:

[0057] Improve precision: Through edge detection, the edge position of the acrylic sheet can be accurately determined, providing an accurate reference point for bending and forming, thereby improving forming accuracy.

[0058] Ensure quality: Edge detection helps identify and eliminate bad edges, ensuring that only high-quality edges are retained during the molding process, improving the aesthetics and durability of the final product.

[0059] Automated control: The edge detection step can be automated to reduce manual intervention and improve production efficiency and consistency.

[0060] Reduce material waste: Accurate edge detection can ensure that the edge of the acrylic sheet is fully utilized, reducing material waste caused by inaccurate edge positioning.

[0061] The working principle of the present invention is:

[0062] Heating preparation stage:

[0063] The acrylic plate 4 is placed on the first working table 6 .

[0064] The first heating tube 7 is located 20 cm above the acrylic plate to locally heat the natural bending part of the acrylic plate.

[0065] Bending stage:

[0066] The heating brings the acrylic sheet 4 to the appropriate temperature so that it becomes soft and ready to be bent.

[0067] The acrylic plate 4 bends naturally under the action of gravity to form a preliminary curved shape.

[0068] Finalization stage:

[0069] The bent acrylic sheet 4 is moved to the molding assembly through an automatic assembly line.

[0070] The left molding upper mold frame 1 and the right molding upper mold frame 2 are molded together by an X-axis moving mechanism and are positioned and stopped at 1 mm above the acrylic plate.

[0071] Through the Y-axis moving mechanism, the left molding upper mold frame and the right molding upper mold frame are pressed down to close the mold and stop at a position 1mm close to the top surface of the acrylic plate.

[0072] The left molding upper mold frame and the right molding upper mold frame continue to close the mold in the horizontal direction (X direction), closely contacting the acrylic plate to complete the shaping.

[0073] Cooling phase:

[0074] The second heating tube heats the bent portion of the acrylic plate to further fix the shape.

[0075] The natural wind cooling component 5 cools the formed acrylic plate to ensure its shape stability and eliminate stress.

[0076] The present invention makes full use of the physical property of the acrylic plate that becomes soft when heated to heat the part that needs to be bent, and at the same time uses the gravity of the acrylic plate itself + the forming mold to form, and uses the natural air cooling system to cool down, so as to control the surface transparency and flatness of the acrylic plate, and eliminate the stress problem of the acrylic plate, so as to achieve a good appearance and a precision size that meets the product requirements, and the tolerance can reach ±0.3mm.

[0077] 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. An acrylic plate bending device, characterized in that: It comprises a bending component, a molding component and a natural wind cooling component. The bending component is used for bending the acrylic plate, the molding component is used for shaping the bent acrylic plate; the natural wind cooling component is used for cooling the bent acrylic plate when the molding component shapes the bent acrylic plate.

2. The acrylic plate bending device according to claim 1, characterized in that: The bending assembly includes a first workbench, a first heating tube and a first heating tube mounting bracket. Several first heating tube mounting brackets are installed at a position close to the first workbench, and the first heating tube is installed on each of the first heating tube mounting brackets. When the acrylic plate is placed on the first workbench, the first heating tube is close to the natural bending point of the acrylic plate.

3. The acrylic plate bending device according to claim 1 or 2, characterized in that: The molding assembly includes a frame, a left molding upper mold frame, a right molding upper mold frame, a molding lower mold frame, a second heating tube and a second heating tube mounting frame. The molding lower mold frame, the left molding upper mold frame, the right molding upper mold frame and the second heating tube mounting frame are installed on the frame. The left molding upper mold frame is installed on the upper part of one side of the molding lower mold frame, and the right molding upper mold frame is installed on the upper part of the other side of the molding lower mold frame. The right molding upper mold frame and the left molding upper mold frame are symmetrically arranged along the molding lower mold frame; a bending molding space is formed between the right molding upper mold frame and the molding lower mold frame, and between the left molding upper mold frame and the molding lower mold frame bracket; the second heating tube is installed on the second heating tube mounting frame, and each of the second heating tubes is close to the bending molding part of the acrylic plate.

4. The acrylic plate bending device according to claim 3, characterized in that: The left upper forming mold frame has the same structure as the right upper forming mold frame, both of which include a transverse pressing plate and a vertical pressing plate integrally formed with the transverse pressing plate, and the space between the transverse pressing plate and the vertical pressing plate forms the bending forming space.

5. The acrylic plate bending device according to claim 4, characterized in that: The left upper molding die frame and the right upper molding die frame are both installed on the frame through a moving assembly, and the moving assembly includes an X-direction moving mechanism and a Y-direction moving mechanism. The Y-direction moving mechanism is installed on the X-direction moving mechanism and moves in the horizontal direction with the X-direction moving mechanism; the X-direction moving mechanism is used to drive the left upper molding die frame or the right upper molding die frame in the horizontal direction; the Y-direction moving mechanism is used to drive the left upper molding die frame or the right upper molding die frame in the vertical direction.

6. The acrylic plate bending device according to claim 5, characterized in that: The natural wind cooling assembly is arranged on the outer sides of the left upper molding mold frame and the right upper molding mold frame, and the air outlet of the natural wind cooling assembly faces the bending molding space.

7. The acrylic plate bending device according to claim 6, characterized in that: An arc-shaped chamfered area is formed on the lower forming mold frame near the bending forming portion of the acrylic plate.

8. The acrylic plate bending device according to claim 7, characterized in that: When the acrylic plate on the lower molding mold frame is bent, the step of edge detection of the acrylic plate is also included, which is specifically: 1.1 Noise elimination: Use an industrial camera to collect images of acrylic plates, and apply a Gaussian filter to the collected images to smooth the images to reduce the noise in the images; 1.2 Calculate the gradient magnitude: Use the Sobel operator to calculate the gradient magnitude and direction of the image, where the gradient magnitude represents the strength of the edge and the gradient direction represents the direction of the edge; 1.3 Non-maximum suppression: In the gradient direction, the gradient magnitude of each pixel is checked. If the gradient magnitude of the pixel is not the local maximum, it is set to zero; 1.4 Dual threshold detection: Select two thresholds, a high threshold and a low threshold. The high threshold is used to detect strong edges, and the low threshold is used to detect weak edges. Pixels on strong edges are retained, and pixels on weak edges are retained based on whether they are connected to strong edges. 1.5 Edge tracking: Starting from a strong edge pixel, trace the edges until they meet another strong edge pixel or the image boundary; 1.6 Edge refinement: The edge detected by dual threshold is refined into a one-pixel wide curve to improve the accuracy of edge detection.

Images