Plastic eyeglass frame hot forming device based on automatic transmission feeding

Abstract

The utility model discloses a kind of plastic spectacle frame thermoforming devices based on automatic transmission feeding, it is related to spectacle frame forming technical field, including hot press forming machine, hot press forming machine includes lower heating mould, and one side of hot press forming machine is provided with feeding mechanism, by the setting of feeding mechanism, manually place next group of plastic plate above placement table, by two sets of limit plate, plastic plate is positioned, when needing to be moved to lower heating mould above plastic plate, by the piston rod of control cylinder shortening, drive third shell and second shell to move downwards, drive positive and negative screw rod to rotate, make two sets of clamping plate close, plastic plate is clamped, then the output shaft rotation of control motor is driven, drive clamping plate to rotate 180 degrees, plastic plate is located above lower heating mould, the piston rod of control cylinder is elongated, plastic plate is clamped, plastic plate falls in above lower heating mould, and plastic plate can be quickly and accurately transported to specified position.

Description

Technical Field

[0001] This utility model relates to the field of eyeglass frame molding technology, specifically to a plastic eyeglass frame thermoforming device based on automatic conveying and feeding. Background Technology

[0002] As is widely known, a thermoforming device for plastic eyeglass frames is an automated processing equipment specifically designed for producing acetate eyeglass frames. Its core process involves heating pre-cut plastic sheets (such as rectangular blocks or rough blanks made of cellulose acetate or TR-90 material) to a softened state, then applying pressure through a mold to bend and shape them, and finally cooling them to form a semi-finished frame with a precise curvature. Compared to traditional injection molding, frames produced by thermoforming devices have higher surface gloss and dimensional stability, making them particularly suitable for manufacturing high-quality acetate eyeglass frames with diverse styles and smooth lines.

[0003] However, this technology still has certain shortcomings: most of the cut plastic sheets rely on manual placement into the mold groove of the lower heating mold; this operation has several limitations: firstly, manual loading is inefficient and cannot meet the needs of large-scale continuous production; secondly, each placement requires operators to align the mold groove contour based on experience, and the positioning accuracy is greatly affected by human factors, easily resulting in offset or angular deviation; thirdly, long-term repetitive work can easily lead to visual fatigue of the operator, further increasing the probability of positioning errors; the above problems may ultimately lead to quality defects such as contour misalignment and uneven curvature in the hot-pressed frames, resulting in a higher product scrap rate and restricting further improvement in production efficiency and yield. Utility Model Content

[0004] The purpose of this invention is to provide a thermoforming device for plastic eyeglass frames based on automatic conveying and feeding, so as to solve the above-mentioned shortcomings in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a hot press molding machine, the hot press molding machine including a lower heating mold, and a feeding mechanism for feeding materials is provided on one side of the hot press molding machine.

[0006] As a further description of the above technical solution: the feeding mechanism includes an L-shaped plate, which is fixedly connected to one side of the hot press forming machine. One end of the L-shaped plate is fixedly connected to a placement platform, and the top of the placement platform is fixedly connected to two sets of limiting plates.

[0007] As a further description of the above technical solution: a motor is fixedly connected to the bottom of the L-shaped plate, and the output shaft of the motor passes through the L-shaped plate and is fixedly connected to the first housing.

[0008] As a further description of the above technical solution: a cylinder is fixedly connected to the inner wall of the first housing, a third housing is fixedly connected to the piston rod of the cylinder, a rotating shaft is rotatably connected inside the third housing, a first gear is fixedly connected to one end of the rotating shaft, and a rack plate is fixedly connected to the inner wall of the first housing, the rack plate meshing with the gear.

[0009] As a further description of the above technical solution: one end of the third housing is fixedly connected to the second housing, the inner wall of the second housing is rotatably connected to a positive and negative screw, and the outer surface of the positive and negative screw is fixedly connected to a third bevel gear.

[0010] As a further description of the above technical solution: a second bevel gear is fixedly connected to the other end of the rotating shaft, and the second bevel gear meshes with a third bevel gear.

[0011] As a further description of the above technical solution: the outer surface of the positive and negative screws is threaded with two sets of threaded seats, the threaded seats are slidably connected inside the second housing, a clamping plate is fixedly connected to one side of the threaded seat, and a rubber pad is fixedly connected to one side of the clamping plate.

[0012] In the above technical solution, the plastic eyeglass frame thermoforming device based on automatic conveying and feeding provided by this utility model has the following beneficial effects:

[0013] By setting up a feeding mechanism, while the thermoforming machine is processing one set of plastic sheets, the next set of plastic sheets can be manually placed above the placement table. The plastic sheets are positioned by two sets of limiting plates. When it is necessary to move the plastic sheet above the lower heating mold, the piston rod of the control cylinder is shortened, which drives the third and second housings to move downward. The rack plate rotates the gear, which drives the positive and negative screws to rotate, bringing the two sets of clamping plates closer together to clamp the plastic sheet. Then, the output shaft of the control motor is rotated, which drives the clamping plates to rotate 180 degrees. The plastic sheet is now above the lower heating mold. The piston rod of the control cylinder is extended, and the two sets of clamping plates move away, releasing the clamping of the plastic sheet. The plastic sheet falls above the lower heating mold, which can quickly and accurately transport the plastic sheet to the designated position. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0015] Figure 1 A structural schematic diagram provided for an embodiment of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the L-shaped plate provided in an embodiment of the present utility model;

[0017] Figure 3 A schematic diagram of the structure of the first housing provided in an embodiment of this utility model;

[0018] Figure 4 A schematic diagram of the structure of the second housing provided in an embodiment of this utility model.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1. Hot press molding machine; 2. Lower heating mold; 3. Feeding mechanism; 301. L-shaped plate; 302. Placement platform; 303. First housing; 304. Second housing; 305. Motor; 306. Cylinder; 307. Third housing; 308. Rotating shaft; 309. First gear; 3010. Rack plate; 3011. Second bevel gear; 3012. Positive and negative screws; 3013. Third bevel gear; 3014. Threaded seat; 3015. Clamping plate; 3016. Rubber pad; 3017. Limiting plate. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0022] Please see Figures 1-4 This utility model provides a technical solution: including a hot press molding machine 1, which includes a lower heating mold 2. A feeding mechanism 3 for feeding material is provided on one side of the hot press molding machine 1. The working principle of the hot press molding machine 1 is as follows: a pre-cut plastic sheet is placed in the heating mold, and the sheet is softened to a plastic state by the heating system. Then, the upper mold is driven by the hydraulic or pneumatic system to press down, so that the sheet is pressed in the mold cavity and conforms to the mold outline. Finally, the cooling system holds the pressure and cools down to fix the shape, so that the internal stress of the material is eliminated, and a semi-finished mirror frame with precise curvature and size is formed. The hot press molding machine 1 is prior art and will not be described in detail here.

[0023] In another embodiment of this utility model, preferably, the feeding mechanism 3 includes an L-shaped plate 301, which is fixedly connected to one side of the hot press forming machine 1. One end of the L-shaped plate 301 is fixedly connected to a placement platform 302, and the top of the placement platform 302 is fixedly connected to two sets of limiting plates 3017. The plastic sheet to be processed is placed on the placement platform 302 in advance. After the previous plastic sheet is processed, the plastic sheet on the placement platform 302 is transported to the top of the lower heating plate. The height of the top of the placement platform 302 is the same as the height of the top of the lower heating mold 2. The plastic sheet can be positioned by the setting of the two sets of limiting plates 3017. Both sides of the plastic sheet are in contact with the limiting plates 3017, so that the plastic sheet is placed in the same position on the placement platform 302.

[0024] In another embodiment of the present invention, a motor 305 is fixedly connected to the bottom of the L-shaped plate 301. The output shaft of the motor 305 passes through the L-shaped plate 301 and is fixedly connected to the first housing 303. By setting the motor 305, the first housing 303 can be rotated 180 degrees by controlling the output shaft of the motor 305 to rotate.

[0025] In another embodiment of this utility model, a cylinder 306 is fixedly connected to the inner wall of the first housing 303, and a third housing 307 is fixedly connected to the piston rod of the cylinder 306. A rotating shaft 308 is rotatably connected inside the third housing 307, and a first gear 309 is fixedly connected to one end of the rotating shaft 308. A rack plate 3010 is fixedly connected to the inner wall of the first housing 303, and the rack plate 3010 meshes with the gear. By controlling the piston rod of the cylinder 306 to shorten, the third housing 307 can be driven to move downward, causing the first gear 309 to move downward. By controlling the rack plate 3010, the first gear 309 can rotate while moving downward.

[0026] It should be noted that cylinder 306 is used in conjunction with an air compressor, an air tank, a filter pressure reducing valve, a directional control valve, and a flow control valve. During use, the air compressor compresses ambient air to a set pressure and stores it in the air tank. The filter pressure reducing valve further purifies the air and stabilizes the pressure, then delivers it to the control valve through an air pipe. The directional control valve switches the airflow channel according to an electrical signal to determine the extension and retraction direction of cylinder 306. The flow control valve adjusts the airflow speed to control the movement speed of cylinder 306. Compressed air enters the rod chamber or rodless chamber of cylinder 306, pushing the piston to move. The piston drives the piston rod to output linear reciprocating motion.

[0027] In another embodiment of this utility model, one end of the third housing 307 is fixedly connected to the second housing 304. The inner wall of the second housing 304 is rotatably connected to a positive and negative screw 3012. The outer surface of the positive and negative screw 3012 is fixedly connected to a third bevel gear 3013. The other end of the rotating shaft 308 is fixedly connected to a second bevel gear 3011. The second bevel gear 3011 and the third bevel gear 3013 are meshed together. By setting the rotating shaft 308, when the first gear 309 rotates, it can drive the rotating shaft 308 to rotate, drive the second bevel gear 3011 to rotate, and cause the meshing third bevel gear 3013 to rotate, thereby driving the positive and negative screw 3012 to rotate inside the second housing 304.

[0028] It should be noted that during use, the positive and negative screws 3012 need to be cleaned regularly by the staff and lubricated with oil for maintenance to prevent them from being exposed to the outside for a long time, which could cause dust to enter and cause them to jam.

[0029] In another embodiment of this utility model, two sets of threaded seats 3014 are threadedly connected to the outer surface of the positive and negative screws 3012. The threaded seats 3014 are slidably connected inside the second housing 304. A clamping plate 3015 is fixedly connected to one side of the threaded seat 3014, and a rubber pad 3016 is fixedly connected to one side of the clamping plate 3015. With the threaded seats 3014, when the positive and negative screws 3012 rotate, the two sets of threaded seats 3014 can be moved, which in turn moves the clamping plate 3015 to clamp the plastic plate. With the rubber pad 3016, the clamping stability can be improved, and the plastic plate is less likely to be damaged.

[0030] Working Principle: When the hot press molding machine 1 processes a set of plastic sheets, the next set of plastic sheets is manually placed above the placement table 302. Two sets of limiting plates 3017 position the plastic sheets, ensuring both sides of the sheets are in contact with the limiting plates 3017, placing them in the same position on the placement table 302. To move the plastic sheets above the lower heating mold 2, the piston rod of the control cylinder 306 is shortened, causing the third housing 307 and the second housing 304 to move downwards. This causes the first gear 309 to move downwards. The rack plate 3010 allows the first gear 309 to rotate while moving downwards, driving the rotating shaft 308 to rotate, which in turn drives the second bevel gear 3011 to rotate, thus engaging the third... The bevel gear 3013 rotates, driving the positive and negative screws 3012 to rotate inside the second housing 304, bringing the two sets of clamping plates 3015 closer together to clamp the plastic sheet. Then, the output shaft of the motor 305 is controlled to rotate, causing the clamping plates 3015 to rotate 180 degrees, so that the plastic sheet moves just above the lower heating mold 2. The piston rod of the cylinder 306 is controlled to extend, driving the positive and negative screws 3012 to rotate in the opposite direction, causing the two sets of clamping plates 3015 to move away from each other, releasing the clamping plates 3015 from the plastic sheet. The plastic sheet falls above the lower heating mold 2, which can quickly and accurately transport the plastic sheet to the designated position. Then, the output shaft of the motor 305 is controlled to rotate 180 degrees in the opposite direction, and the two sets of clamping plates 3015 move above the placement table 302, waiting for the next feeding.

[0031] It should be noted that: all the above-mentioned electrical equipment is electrically connected to the control terminal via wires, and the control terminal can be set as a PLC logic controller. This is existing technology. The specific structure, working principle, and possible control methods and spatial arrangement of these technical features can be selected using conventional methods in this field. This technical solution will not be further elaborated in detail.

[0032] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A thermoforming device for plastic eyeglass frames based on automatic conveying and feeding, characterized in that, The hot press forming machine (1) includes a lower heating mold (2) and a feeding mechanism (3) for feeding is provided on one side of the hot press forming machine (1). The feeding mechanism (3) includes an L-shaped plate (301), which is fixedly connected to one side of the hot press forming machine (1). One end of the L-shaped plate (301) is fixedly connected to a placement platform (302), and the top of the placement platform (302) is fixedly connected to two sets of limiting plates (3017).

2. The thermoforming device for plastic eyeglass frames based on automatic conveying and feeding as described in claim 1, characterized in that, A motor (305) is fixedly connected to the bottom of the L-shaped plate (301), and the output shaft of the motor (305) passes through the L-shaped plate (301) and is fixedly connected to the first housing (303).

3. The thermoforming device for plastic eyeglass frames based on automatic conveying and feeding according to claim 2, characterized in that, A cylinder (306) is fixedly connected to the inner wall of the first housing (303). The piston rod of the cylinder (306) is fixedly connected to a third housing (307). A rotating shaft (308) is rotatably connected inside the third housing (307). A first gear (309) is fixedly connected to one end of the rotating shaft (308). A rack plate (3010) is fixedly connected to the inner wall of the first housing (303). The rack plate (3010) meshes with the gear.

4. The thermoforming device for plastic eyeglass frames based on automatic conveying and feeding according to claim 3, characterized in that, One end of the third housing (307) is fixedly connected to the second housing (304), and the inner wall of the second housing (304) is rotatably connected to the positive and negative screws (3012). The outer surface of the positive and negative screws (3012) is fixedly connected to the third bevel gear (3013).

5. A plastic eyeglass frame thermoforming device based on automatic conveying and feeding according to claim 4, characterized in that, The other end of the rotating shaft (308) is fixedly connected to a second bevel gear (3011), which meshes with a third bevel gear (3013).

6. The thermoforming device for plastic eyeglass frames based on automatic conveying and feeding according to claim 5, characterized in that, The outer surface of the positive and negative screws (3012) is threaded with two sets of thread seats (3014). The thread seats (3014) are slidably connected inside the second housing (304). A clamping plate (3015) is fixedly connected to one side of the thread seats (3014), and a rubber pad (3016) is fixedly connected to one side of the clamping plate (3015).

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