Thermal forming equipment for plastic product processing and use method thereof

Abstract

The invention discloses thermal forming equipment for plastic product processing and a using method thereof, and relates to the technical field of injection molding processing.The thermal forming equipment comprises a lower mold plate and an upper mold plate, a pressing mechanism is arranged above the top end of the upper mold plate, and the pressing mechanism comprises a gland and an injection molding pouring gate; and the injection molding machine injects plastic melt into the lower mold plate and the upper mold plate through the injection molding runner to form a plastic product. The pressing mechanism is arranged on the upper mold plate, the distance between the fixed arm and the suspension plate is controlled by means of the butt joint separation and attachment state of the gland and the upper mold plate, during mold closing, the distance between the fixed arm and the suspension plate is reduced, the first rotating rod pulls the sliding column to move inwards, and therefore the positions of the peripheral butt joint pressing plates are closed; the outer side walls of the lower mold plate and the upper mold plate are subjected to secondary positioning through the opposite seam pressing plates with the peripheries attached inwards, the position deviation in the mold closing process is reduced, and therefore the problem that the outer side mold closing line of a plastic product is too obvious due to inaccurate mold closing positioning is solved, and the forming quality of the plastic product is improved.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, in particular to a thermoforming device for plastic product processing and a use method thereof. Background Art

[0002] Plastic injection mold is a thermoforming equipment for plastic product processing, a tool used in the injection molding process, which mainly consists of two parts: the movable mold and the fixed mold. The fixed mold is usually installed on the fixed template of the injection molding machine, while the movable mold is installed on the movable template. During the injection molding process, the movable mold and the fixed mold are closed by the mold clamping device to form a closed cavity, in which the plastic melt is cooled and solidified.

[0003] However, in the prior art, since the injection mold needs to be frequently opened and closed, the upper and lower molds are positioned by guide pins and guide sleeves. In order to increase the opening and closing speeds, the slot size of the upper and lower molds is larger than the outer diameter of the guide pins, resulting in reduced positioning accuracy of the upper and lower molds, forming an obvious closing line on the outside of the molded plastic product, affecting the molding quality of the plastic product. Summary of the invention

[0004] The object of the present invention is to provide a thermoforming device for processing plastic products and a method of using the same to solve the problems raised by the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a thermoforming device for processing plastic products, comprising a lower template and an upper template, a pressing mechanism is arranged above the top of the upper template, the pressing mechanism comprises a pressure cover and an injection molding runner, an injection molding machine injects plastic melt into the lower template and the upper template through the injection molding runner to form a plastic product, circular grooves are provided at the four corner positions of the pressure cover, a sliding shaft is slidably connected to the inner side wall of the circular groove, the sliding shaft is fixedly connected to the top surface of the upper template, the four sides of the sliding shaft are fixedly connected to the lifting assembly, and the four sides of the upper template are fixedly connected to the supporting assembly. The support assembly includes a suspension plate and a suspension arm, the suspension plate is fixedly connected to the upper template via the suspension arm, the side wall of the suspension plate is provided with a positioning seat, the inner side wall of the positioning seat is slidably connected to a sliding column, one end of the sliding column is fixedly connected to a seam pressure plate, the lifting assembly includes a fixed arm, the fixed arm is fixedly connected to a pressure cover, the outer side wall of the fixed arm is slidably connected to a sliding seat, one side surface of the sliding seat is rotatably connected to a rotating rod 1, so that one end of the rotating rod 1 is rotatably connected to the sliding column, the other side surface of the sliding seat is rotatably connected to a rotating rod 2, and the rotating rod 2 is rotatably connected to the side wall of the suspension plate.

[0006] Preferably, a lower mold cavity is formed on the upper surface of the lower mold plate, and an upper mold cavity is formed on the lower surface of the upper mold plate.

[0007] Preferably, positioning holes 1 are provided at the four corners of the lower template, and positioning holes 2 are provided at the four corners of the upper template.

[0008] Preferably, the inner side walls of the positioning hole 1 and the positioning hole 2 are both provided with bearing seats.

[0009] Preferably, both sides of the bottom end of the lower template are fixedly connected to support seats, and the bottom end of the support seat is fixedly connected to a base.

[0010] Preferably, both ends of the top surface of the support seat are fixedly connected with positioning columns, and the positioning columns are slidably connected to the first positioning hole and the second positioning hole.

[0011] Preferably, cooling channels are provided on the inner sides of the lower mold plate and the upper mold plate, and the plastic product is cooled and shaped by passing water into the cooling channels.

[0012] Preferably, exhaust grooves are provided on both sides of the lower mold cavity, and the inner side walls of the sliding seat and the positioning seat are coated with lubricant.

[0013] Preferably, a circular baffle is fixedly connected to the top end of the sliding shaft, and a washer is fixedly connected to the bottom end of the positioning column.

[0014] The present invention also discloses a method for using a thermoforming device for processing plastic products, comprising the following steps: Step 1: Pull the pressing mechanism upwards to open the seam pressing plates around it outwards. The circular baffle at the top of the sliding shaft is embedded with a magnet to temporarily fix the pressing mechanism. In the initial state of the thermoforming equipment, the upper template and the pressing mechanism are in a completely separated state, and the pressing mechanism is attached to the bottom of the circular baffle. Due to the large gap between the fixed arm and the suspension plate, the sliding seat connected to the rotating rod 1 and the rotating rod 2 is moved outwards, and the seam pressing plate is in an unfolded state. Step 2: Use the positioning column to position the lower mold plate and the upper mold plate. Before closing the mold, the inner wall of the lower mold cavity and the upper mold cavity needs to be cleaned, and then some paint is applied to facilitate the subsequent demolding process. When closing the mold, the air inside the lower mold cavity and the upper mold cavity needs to be exhausted to avoid defects on the surface of the plastic product; Step 3: Align the injection molding machine with the injection runner, and the injection head applies downward pressure to the gland, and use the closed seam pressing plate to perform secondary alignment. The injection molding machine controls the position of the injection head through the cylinder to provide pressure for the pressing mechanism to ensure that the lower mold plate and the upper mold plate have sufficient pressure when they are molded to meet the molding conditions of the plastic product. After alignment, the gland moves closer to the upper mold plate, reducing the distance between the fixed arm and the suspension plate, and the sliding seat moves inward, causing the sliding column to slide and drive the seam pressing plate to close, aligning the outer side walls of the lower mold plate and the upper mold plate, so that the mold cavity formed by the lower mold cavity and the upper mold cavity is aligned for the second time; Step 4: The injection molding machine injects the molten plastic into the injection runner to form a plastic product in the mold cavity formed by the lower mold cavity and the upper mold cavity. In the initial state, the molten plastic is injected by the pressure of the injection head, and after passing through the pressure cap and the upper mold plate along the injection runner, the mold cavity is filled to form the shape of the plastic product; Step 5: After the plastic product is cooled and shaped, the lower mold and the upper mold are separated, and the plastic product is taken out from the lower mold cavity. After it is filled with molten plastic, the injection molding machine is withdrawn, and cooling water is introduced into the interior through the cooling channel to accelerate the shaping of the product. After a period of time, the lower mold and the upper mold are separated, and the finished plastic product is taken out from the lower mold cavity.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, a pressing mechanism is provided on the upper template, and the separation and bonding state of the pressure cover and the upper template are utilized to control the distance between the fixed arm and the suspension plate. When the mold is closed, the distance between the fixed arm and the suspension plate is reduced, and the rotating rod pulls the sliding column to move inward, thereby closing the positions of the seam pressing plates on all sides. The seam pressing plates that are bonded inward on all sides reposition the outer side walls of the lower template and the upper template, reducing the position deviation during mold closing, thereby eliminating the problem of too obvious outer side mold line of the plastic product caused by inaccurate mold closing positioning, and improving the molding quality of the plastic product.

[0016] 2. In the present invention, by arranging the exhaust groove on the outer side of the lower mold cavity, the air can be exhausted as much as possible before injection molding, thereby reducing the product defects of the molded product and further improving the molding quality of the plastic product.

[0017] 3. In the present invention, cooling channels are arranged around the upper mold cavity and the lower mold cavity. After the molten plastic is filled, cooling water is introduced into the interior through the cooling channels to accelerate the shaping of the product. After a period of time, the lower mold and the upper mold are separated, thereby improving the molding rate of the plastic product.

[0018] 4. In the present invention, the calibers of positioning hole 1 and positioning hole 2 are designed to be larger than the outer diameter of the positioning column, so that the positioning column can quickly and smoothly pass through positioning hole 1 and positioning hole 2 for initial positioning, reducing the difficulty of docking the lower mold and the upper mold when they are closed, and further improving the production rate of plastic products. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of a thermoforming device for processing plastic products according to the present invention; Figure 2 This is a schematic diagram of the structure of a thermoforming device for processing plastic products according to the present invention in a mold closing state; Figure 3 A schematic diagram of the partial structural breakdown of a thermoforming device for processing plastic products according to the present invention Figure 1 ; Figure 4 A schematic diagram of the partial structural breakdown of a thermoforming device for processing plastic products according to the present invention Figure 2 ; Figure 5 This is a schematic diagram of the mold splitting structure of a thermoforming device for processing plastic products according to the present invention; Figure 6 It is a structural schematic diagram of a support component and a lifting component in a thermoforming device for processing plastic products of the present invention; Figure 7 The present invention is a schematic diagram of the partial structure and movement of a thermoforming device for processing plastic products.

[0020] In the figure: 1. base; 2. support seat; 3. lower template; 30. positioning hole one; 31. lower mold cavity; 4. upper template; 40. positioning hole two; 41. upper mold cavity; 42. support assembly; 421. suspension plate; 422. suspension arm; 423. positioning seat; 424. sliding column; 425. seam pressure plate; 5. pressing mechanism; 51. pressure cover; 52. circular groove; 53. injection runner; 54. sliding shaft; 55. lifting assembly; 551. fixed arm; 552. sliding seat; 553. rotating rod one; 554. rotating rod two; 6. positioning column. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1: Reference Figure 1-7As shown: a thermoforming device for processing plastic products, including a lower template 3 and an upper template 4, a pressing mechanism 5 is arranged above the top of the upper template 4, the pressing mechanism 5 includes a pressure cap 51 and an injection runner 53, the injection molding machine injects the plastic melt into the lower template 3 and the upper template 4 through the injection runner 53 to form a plastic product, the pressure cap 51 is provided with a circular groove 52 at the four corner positions, the inner side wall of the circular groove 52 is slidably connected with a sliding shaft 54, the sliding shaft 54 ​​is fixedly connected to the top surface of the upper template 4, the four sides of the sliding shaft 54 ​​are fixedly connected with a lifting assembly 55, the four sides of the upper template 4 are fixedly connected with a support assembly 42, the support assembly 42 includes a suspension plate 421 and a suspension arm 422, the suspension plate 4 21 is fixedly connected to the upper template 4 through the suspension arm 422, the side wall of the suspension plate 421 is provided with a positioning seat 423, the inner side wall of the positioning seat 423 is slidably connected with a sliding column 424, one end of the sliding column 424 is fixedly connected with a seam pressing plate 425, the lifting component 55 includes a fixed arm 551, the fixed arm 551 is fixedly connected to the pressure cover 51, the outer side wall of the fixed arm 551 is slidably connected with a sliding seat 552, one side of the sliding seat 552 is rotatably connected with a rotating rod 1 553, so that one end of the rotating rod 1 553 is rotatably connected to the sliding column 424, the other side of the sliding seat 552 is rotatably connected with a rotating rod 2 554, and the rotating rod 2 554 is rotatably connected to the side wall of the suspension plate 421.

[0023] In this embodiment, the lower template 3 and the upper template 4 are positioned by the positioning column 6 during mold closing. Since the lower template 3 and the upper template 4 often need to be separated and closed, there is a positive tolerance between the positioning hole 1 30 and the positioning hole 2 40 to facilitate rapid docking and positioning, thereby improving the mold closing rate. Since the positioning column 6 is not in a tight fit state with the positioning hole 1 30 and the positioning hole 2 40, the precision angle of mold closing can easily form an obvious mold closing line on the molded plastic product, affecting the appearance and feel of the finished plastic product. A pressing mechanism 5 is provided on the upper template 4. There is no need for the pressing mechanism 5 and the upper template 4 to be separated and matched. Therefore, the sliding shaft 54 ​​and the circular groove 52 are set to a tight fit state to ensure that the upper template 4 and the pressing mechanism 5 are accurately positioned when they are closed, and a fixed arm 551 is provided on the outer side of the pressing mechanism 5. When the lower template 3 and the upper template 4 are in the mold separation state, the upper template 4 and the pressing mechanism 5 are also in the distance state, and a certain gap is left between the pressing mechanism 5 and the upper template 4, and the distance between the fixed arm 551 and the suspension plate 421 increases. Since the sliding seat 552 is in an active state, and one end of the sliding seat 552 is connected to the suspension plate 421 through the rotation rod 2 554, the rotation rod 1 553 will pull the sliding column 424 to move outward, thereby expanding the position of the surrounding seam pressing plates 425, and the redundant space facilitates the alignment of the outer side walls of the lower template 3 and the upper template 4 for mold closing; When the lower template 3 and the upper template 4 are in the mold closing state, the injection molding machine squeezes the pressing mechanism 5 downward, the upper template 4 and the pressing mechanism 5 are in the fitted state, the distance between the fixed arm 551 and the suspension plate 421 is reduced, and the rotating rod 553 will pull the sliding column 424 inward, thereby closing the position of the seam pressure plate 425 on all sides. The seam pressure plate 425 that is fitted inward on all sides will re-position the outer side walls of the lower template 3 and the upper template 4, reduce the position deviation during mold closing, reduce the size of the mold line formed by the plastic product, make the mold line less obvious, and thus improve the molding quality of the plastic product.

[0024] Embodiment 2: Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the upper surface of the lower template 3 is provided with a lower mold cavity 31, and the lower surface of the upper template 4 is provided with an upper mold cavity 41. The four corner positions of the lower template 3 are provided with positioning holes 1 30, and the four corner positions of the upper template 4 are provided with positioning holes 2 40. The inner side walls of the positioning holes 1 30 and the positioning holes 2 40 are provided with bearing seats. The two sides of the bottom end of the lower template 3 are fixedly connected with the support seat 2, and the bottom end of the support seat 2 is fixedly connected with the base 1. The top ends of the support seat 2 are fixedly connected with positioning columns 6, and the positioning columns 6 are slidably connected with the positioning holes 1 30 and the positioning holes 2 40. The inner sides of the lower template 3 and the upper template 4 are provided with cooling channels, and the plastic products are cooled and shaped by passing water into the cooling channels. Exhaust grooves are provided on both sides of the lower mold cavity 31, and the inner side walls of the sliding seat 552 and the positioning seat 423 are coated with lubricants. The top end of the sliding shaft 54 ​​is fixedly connected with a round baffle, and the bottom end of the positioning column 6 is fixedly connected with a gasket.

[0025] In this embodiment, in order to reduce the difficulty of docking the lower mold 3 and the upper mold 4 when the mold is closed, the caliber of the positioning hole 30 and the positioning hole 2 40 is designed to be larger than the outer diameter of the positioning column 6, so that the positioning column 6 can quickly and smoothly pass through the positioning hole 30 and the positioning hole 2 40 for initial positioning. In order to prevent the pressure cover 51 from detaching from the upper mold 4, a circular baffle is installed at the top of the sliding shaft 54, so that the sliding of the pressure cover 51 can be limited. At the same time, a gasket is provided at the bottom end of the positioning column 6, which can effectively relieve the pressure during mold closing. By providing an exhaust groove on the outer side of the lower mold cavity 31, the air can be exhausted as much as possible before injection molding, thereby reducing the product defects of the molded product. A cooling channel is provided at the periphery of the lower mold cavity 31 and the upper mold cavity 41 to exchange heat and improve the molding rate of plastic products.

[0026] Embodiment 3: According to Figure 1-7 As shown, a method for using a thermoforming device for processing plastic products comprises the following steps: 1) Pull the pressing mechanism 5 upward to open the seam pressing plates 425 on all sides outward; 2) Using the positioning column 6 to position the lower mold plate 3 and the upper mold plate 4; 3) Align the injection molding machine with the injection runner 53, and the injection head applies downward pressure to the gland 51, and perform secondary alignment using the closed seam pressing plate 425; 4) The injection molding machine injects the molten plastic into the injection runner 53 to form a plastic product in the mold cavity formed by the lower mold cavity 31 and the upper mold cavity 41; 5) After the plastic product is cooled and shaped, the lower mold plate 3 and the upper mold plate 4 are separated, and the plastic product is taken out from the lower mold cavity 31.

[0027] In this embodiment, the circular baffle at the top of the sliding shaft 54 ​​has a magnet embedded in it, which can temporarily fix the pressing mechanism 5. In the initial state of the thermoforming equipment, the upper mold plate 4 and the pressing mechanism 5 are in a completely separated state, and the pressing mechanism 5 is attached to the bottom of the circular baffle. Since the gap between the fixed arm 551 and the suspension plate 421 is too large, the sliding seat 552 connected to the rotating rod 1 553 and the rotating rod 2 554 is moved outward, and the seam pressing plate 425 is in an expanded state. Before closing the mold, the inner walls of the lower mold cavity 31 and the upper mold cavity 41 need to be cleaned, and then some paint is applied to facilitate the subsequent demolding process. When closing the mold, the air inside the lower mold cavity 31 and the upper mold cavity 41 needs to be exhausted to avoid defects on the surface of the plastic product. The injection molding machine controls the position of the injection head through the cylinder to provide pressure for the pressing mechanism 5 to ensure that there is sufficient pressure when the lower mold plate 3 and the upper mold plate 4 are closed to meet the molding conditions of the plastic product. After alignment, the pressure cap 51 moves closer to the upper mold plate 4, so that the distance between the fixed arm 551 and the suspension plate 421 is reduced, and the sliding seat 552 moves inward, causing the sliding column 424 to slide and drive the seam pressing plate 425 to close, so that the outer wall of the lower mold plate 3 and the upper mold plate 4 are aligned, and the mold cavity formed by the lower mold cavity 31 and the upper mold cavity 41 is aligned for the second time. The molten plastic is injected by the pressure of the injection head, and after passing through the pressure cap 51 and the upper mold plate 4 along the injection runner 53, the mold cavity is filled to form the shape of the plastic product. After being filled with molten plastic, the injection molding machine is withdrawn, and cooling water is introduced into the interior through the cooling channel to accelerate the shaping of the product. After a period of time, the lower mold plate 3 and the upper mold plate 4 are separated, and the finished plastic product is taken out from the lower mold cavity 31.

[0028] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A thermoforming device for processing plastic products, comprising a lower mold plate (3) and an upper mold plate (4), characterized in that: A pressing mechanism (5) is arranged above the top of the upper mold plate (4), the pressing mechanism (5) comprising a pressing cover (51) and an injection molding runner (53), the injection molding machine injects molten plastic into the lower mold plate (3) and the upper mold plate (4) through the injection molding runner (53) to form a plastic product, the pressing cover (51) is provided with circular grooves (52) at four corners, the inner side wall of the circular groove (52) is slidably connected to a sliding shaft (54), the sliding shaft (54) is fixedly connected to the top surface of the upper mold plate (4), the four sides of the sliding shaft (54) are fixedly connected to a lifting assembly (55), the four sides of the upper mold plate (4) are fixedly connected to a supporting assembly (42), the supporting assembly (42) comprises a suspension plate (421) and a suspension arm (422), the suspension plate (421) is connected to the upper mold via the suspension arm (422) The plate (4) is fixedly connected, the side wall of the suspension plate (421) is provided with a positioning seat (423), the inner side wall of the positioning seat (423) is slidably connected with a sliding column (424), one end of the sliding column (424) is fixedly connected with a seam pressing plate (425), the lifting component (55) comprises a fixed arm (551), the fixed arm (551) is fixedly connected to the pressure cover (51), the outer side wall of the fixed arm (551) is slidably connected with a sliding seat (552), one side of the sliding seat (552) is rotatably connected with a rotating rod 1 (553), so that one end of the rotating rod 1 (553) is rotatably connected to the sliding column (424), the other side of the sliding seat (552) is rotatably connected with a rotating rod 2 (554), and the rotating rod 2 (554) is rotatably connected to the side wall of the suspension plate (421).

2. A thermoforming equipment for plastic product processing according to claim 1, characterized in that: The upper surface of the lower mold plate (3) is provided with a lower mold cavity (31), and the lower surface of the upper mold plate (4) is provided with an upper mold cavity (41).

3. A thermoforming equipment for plastic product processing according to claim 2, characterized in that: Positioning holes 1 (30) are provided at the four corners of the lower template (3), and positioning holes 2 (40) are provided at the four corners of the upper template (4).

4. A thermoforming device for processing plastic products according to claim 3, characterized in that: The inner side walls of the first positioning hole (30) and the second positioning hole (40) are both provided with bearing seats.

5. The thermoforming equipment for plastic product processing according to claim 4, characterized in that: Both sides of the bottom end of the lower template (3) are fixedly connected to a support seat (2), and the bottom end of the support seat (2) is fixedly connected to a base (1).

6. A thermoforming device for processing plastic products according to claim 5, characterized in that: Both ends of the top surface of the support seat (2) are fixedly connected with positioning columns (6), and the positioning columns (6) are slidably connected to the first positioning hole (30) and the second positioning hole (40).

7. The thermoforming equipment for plastic product processing according to claim 6, characterized in that: Cooling channels are provided on the inner sides of the lower mold plate (3) and the upper mold plate (4), and water is introduced into the cooling channels to cool and shape the plastic product.

8. The thermoforming equipment for plastic product processing according to claim 7, characterized in that: Air vents are provided on both sides of the lower mold cavity (31), and the inner side walls of the sliding seat (552) and the positioning seat (423) are coated with lubricant.

9. The thermoforming equipment for plastic product processing according to claim 8, characterized in that: The top end of the sliding shaft (54) is fixedly connected to a circular baffle, and the bottom end of the positioning column (6) is fixedly connected to a washer.

10. A method for using a thermoforming device for processing plastic products, characterized in that: A thermoforming device for processing plastic products according to any one of claims 1 to 9 is used, comprising the following steps: S1, pulling the pressing mechanism (5) upwards to open the seam pressing plates (425) on all sides outwards; S2, using the positioning column (6) to position the lower mold plate (3) and the upper mold plate (4) together; S3, aligning the injection molding machine with the injection runner (53), the injection molding head presses downward on the gland (51), and performing secondary alignment using the closed seam pressing plate (425); S4, the injection molding machine injects the molten plastic into the injection runner (53), and forms a plastic product in the mold cavity formed by the lower mold cavity (31) and the upper mold cavity (41); S5. After the plastic product is cooled and shaped, the lower mold plate (3) and the upper mold plate (4) are separated, and the plastic product is taken out from the lower mold cavity (31).

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