A polypropylene sheet forming device

Abstract

This utility model discloses a polypropylene sheet forming device, comprising: a hot melt box; a stirring device inside the hot melt box, an exhaust valve at the top, and a discharge port at the bottom; a conveying mechanism with its inlet and outlet connected; an extrusion mechanism; an extrusion mechanism with its inlet connected to the discharge port of the conveying mechanism; an extrusion mechanism with its discharge port having a discharge pipe equipped with a solenoid valve; a pressing mechanism; a pressing mechanism located at the end of the extrusion mechanism away from the conveying mechanism; a cooling mechanism; a cooling mechanism located at the end of the pressing mechanism away from the extrusion mechanism; a second conveying mechanism located at the lower end of the extrusion mechanism, the pressing mechanism, and the cooling mechanism; and multiple forming molds mounted on the second conveying mechanism. The stirring device removes air bubbles, and the exhaust valve discharges the gas. The extrusion mechanism, the pressing mechanism, and the forming molds extrude the treated molten liquid to produce a formed sheet. Since the size of the forming molds is adapted to the target sheet, there is no need to cut the sheet, thereby reducing waste.

Description

Technical Field

[0001] This utility model relates to the field of sheet metal forming technology, and in particular to a polypropylene sheet forming device. Background Technology

[0002] Polypropylene is a thermoplastic resin synthesized from propylene monomers through an addition polymerization reaction. It is a core member of the polyolefin family. Due to its cost advantage, excellent performance and wide applicability, it has become one of the world's highest-volume general-purpose plastics. In 2024, the global annual production capacity exceeded 80 million tons. It is widely used in packaging, building materials, automobiles and medical fields.

[0003] Existing polypropylene sheet forming devices, such as CN214926374U, disclose a polypropylene sheet forming device including a frame. A material box is fixedly connected to the top side of the frame, and a horizontal plate is fitted into the inner wall of the material box. A first hydraulic cylinder is fixedly connected to the top of the horizontal plate, and the top of the first hydraulic cylinder is fixedly connected to the frame. This polypropylene sheet forming device, through the cooperation of the cutter, cooling device, semiconductor cooling plate, and material box, achieves two-stage cooling of the billet and the finished product, ensuring that the temperature of the finished product is low after forming, making it less prone to deformation. This ensures a high yield, improves production efficiency, guarantees uniform edge dimensions of the finished product, reduces the stress on the equipment, and extends the service life of the equipment. It can produce sheets of different specifications, facilitates operation in actual production processes, and is convenient for workers to collect and transport materials. It also facilitates continuous operation of the equipment. In the prior art, air bubbles in the molten polypropylene are not removed before forming, resulting in more defective products. At the same time, the formed sheets need to be cut, generating excessive waste and making the production cost too high for enterprises.

[0004] Therefore, those skilled in the art urgently need a polypropylene sheet forming device that removes air bubbles from the molten liquid and reduces waste before forming the polypropylene sheet. Utility Model Content

[0005] The purpose of this invention is to provide a polypropylene sheet forming device to solve the problems existing in the prior art.

[0006] A polypropylene sheet forming apparatus includes: a hot melt box; a stirring device is installed inside the hot melt box, an exhaust valve is installed at the top, and a discharge port is opened at the bottom; a conveying mechanism for conveying molten liquid; the inlet of the conveying mechanism is connected to the discharge port; an extrusion mechanism; the inlet of the extrusion mechanism is connected to the discharge port of the conveying mechanism; a discharge pipe is fixed to the discharge port of the extrusion mechanism, and a solenoid valve is installed on the discharge pipe; a pressing mechanism; the pressing mechanism is located at the end of the extrusion mechanism away from the conveying mechanism; a cooling mechanism; the cooling mechanism is located at the end of the pressing mechanism away from the extrusion mechanism; a second conveying mechanism for conveying the formed sheet; the second conveying mechanism is located at the lower end of the extrusion mechanism, the pressing mechanism, and the cooling mechanism; and a plurality of forming molds are provided on the second conveying mechanism.

[0007] Preferably, the stirring device includes a motor, a stirring shaft, and stirring rods; the motor is detachably connected to the top surface of the hot melt box; the output end of the motor passes through the top surface of the hot melt box and is fixed to the stirring shaft; and multiple stirring rods are fixed to the stirring shaft.

[0008] Preferably, the conveying mechanism includes a second motor, a housing, and an auger; the second motor is detachably connected to the side of the housing away from the extrusion mechanism, and the output end of the second motor is fixed to the auger through the side of the housing; the top of the housing has a feed inlet, and the side facing the extrusion mechanism has a discharge outlet; the feed inlet and the discharge outlet are fixedly connected.

[0009] Preferably, the extrusion mechanism includes a push rod, a housing, a push plate, and a baffle plate; the push rod is detachably connected to the top surface of the housing, and the push end of the push rod passes through the top surface of the housing and is fixed to the push plate; a through hole is provided on the top surface of the housing near the housing; the baffle plate is fixed on the end of the push plate facing the housing; the top end of the baffle plate passes through the through hole and is located at the upper end of the housing, and the end face away from the push plate is in contact with the inner surface of the housing; a feed inlet is provided on the side of the housing facing the housing, and a discharge outlet is provided at the bottom; the feed inlet is near the top plate of the housing; the feed inlet is fixedly connected to the discharge outlet; and the discharge outlet is fixedly connected to the discharge pipe.

[0010] Preferably, the pressing mechanism includes a housing three, a push rod two, and a pressure plate; the bottom end of the housing three is open; the inner top surface of the housing three is fixedly connected to a plurality of push rod two, and the pushing end of the push rod two is detachably connected to the pressure plate with its pushing end facing downward.

[0011] Preferably, the cooling mechanism includes a housing four, an air inlet pipe, and a refrigeration unit; the housing four has a through hole five on its top surface and multiple through holes six on its bottom surface; one end of the air inlet pipe is fixedly connected to the through hole five, and the other end of the air inlet pipe is connected to the air outlet of the refrigeration unit.

[0012] Preferably, the second conveying mechanism includes a housing five, a transmission roller, a conveyor belt, and a motor three; the top surface of the housing five is open; multiple transmission rollers are fixed between the inner sides of the housing five, and any one of the transmission rollers is connected to the motor three; the conveyor belt is sleeved on the outside of the transmission roller; the conveyor belt is detachably connected to multiple forming molds.

[0013] Preferably, the bottom of the second housing is funnel-shaped.

[0014] Preferably, the bottom of the hot melt box is fixed with multiple support legs 1; the bottom surface of the shell 1 is fixed with support legs 2; the two sides of the shell 2 are respectively fixed with support legs 3; the two sides of the shell 3 are respectively fixed with support legs 4; and the two sides of the shell 4 are respectively fixed with multiple support legs 5.

[0015] Compared with the prior art, the present invention provides a polypropylene sheet forming device, which has the following beneficial effects: The molten liquid is stirred at low speed by a stirring device to remove air bubbles, and the generated gas is discharged by an exhaust valve. Then, the treated molten liquid is extruded by an extrusion mechanism, a pressing mechanism, and a forming mold to directly produce a shaped sheet. Since the size of the forming mold is adapted to the target sheet, there is no need to cut the sheet after forming, which greatly reduces waste and effectively reduces the company's production costs. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the conveying mechanism of this utility model; Figure 4 These are two bottom views of the casing of this utility model; Figure 5 This is a four-view bottom view of the housing of this utility model.

[0018] Wherein: 1 is the hot melt box; 2 is the stirring device; 201 is the motor one; 202 is the stirring shaft; 203 is the stirring rod; 3 is the exhaust valve; 4 is the conveying mechanism one; 401 is the motor two; 402 is the housing one; 403 is the auger; 5 is the extrusion mechanism; 501 is the push rod one; 502 is the housing two; 503 is the push plate; 504 is the baffle plate; 6 is the discharge pipe; 7 is the pressing mechanism; 701 is the housing three; 702 is the push rod two; 703 is the pressure plate; 8 is the cooling mechanism; 801 is the housing four; 8011 is the through hole six; 802 is the air inlet pipe; 9 is the conveying mechanism two; 901 is the housing five; 902 is the transmission roller; 903 is the conveyor belt; 10 is the forming mold; 11 is the support leg one; 12 is the support leg two; 13 is the support leg three; 14 is the support leg four; 15 is the support leg five; 16 is the control mechanism. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1-2 As shown, a polypropylene sheet forming device includes: a hot melt box 1; a stirring device 2 is installed inside the hot melt box 1, an exhaust valve 3 is installed at the top, and a discharge port is opened at the bottom; a conveying mechanism 4 for conveying molten liquid; the inlet of the conveying mechanism 4 is connected to the discharge port; an extrusion mechanism 5; the inlet of the extrusion mechanism 5 is connected to the discharge port of the conveying mechanism 4; a discharge pipe 6 is fixed to the discharge port of the extrusion mechanism 5, and a solenoid valve is installed on the discharge pipe 6; a pressing mechanism 7; the pressing mechanism 7 is located at the end of the extrusion mechanism 5 away from the conveying mechanism 4; a cooling mechanism 8; the cooling mechanism 8 is located at the end of the pressing mechanism 7 away from the extrusion mechanism 5; a second conveying mechanism 9 for conveying the formed sheet; the second conveying mechanism 9 is located at the lower end of the extrusion mechanism 5, the pressing mechanism 7, and the cooling mechanism 8; and a plurality of forming molds 10 are provided on the second conveying mechanism 9.

[0022] In this invention, the stirring device 2 is positioned higher than the extrusion mechanism 5, facilitating the delivery of molten liquid into the extrusion mechanism 5. The conveying mechanism 2 9 moves the forming mold 10, so that each forming mold 10 first moves to below the extrusion mechanism 5 and then stops. The extrusion mechanism 5 squeezes the molten liquid onto the forming mold 10. Then, the conveying mechanism 2 9 is activated again to move the forming mold 10 to below the pressing mechanism 7 and then stops, squeezing the molten liquid on the forming mold 10 into shape. Finally, the conveying mechanism 2 9 is activated again to move the forming mold 10 to below the cooling mechanism 8 and then stops, shaping the formed board and producing the finished board.

[0023] In this invention, the molten liquid is stirred at low speed by the stirring device 2 to remove air bubbles, and the generated gas is discharged by the exhaust valve 3. Subsequently, the processed molten liquid is extruded by the extrusion mechanism 5, the pressing mechanism 7 and the molding die 10 to directly produce the molded sheet. Since the size of the molding die 10 is adapted to the target sheet, no additional cutting is required after molding, thereby greatly reducing waste and effectively reducing the production cost of the enterprise. The speed of the low-speed stirring is controlled at 20-50 r / min.

[0024] In one exemplary embodiment, such as Figure 2 As shown, the stirring device 2 includes a motor 201, a stirring shaft 202, and stirring rods 203; the motor 201 is detachably connected to the top surface of the hot melt box 1; the output end of the motor 201 passes through the top surface of the hot melt box 1 and is fixed with the stirring shaft 202; multiple stirring rods 203 are fixed on the stirring shaft 202.

[0025] In one exemplary embodiment, such as Figure 2-3 As shown, the conveying mechanism 4 includes a motor 401, a housing 402, and an auger 403; the motor 401 is detachably connected to the side of the housing 402 away from the extrusion mechanism 5, and the output end of the motor 401 passes through the side of the housing 402 and is fixed with the auger 403; the top of the housing 402 is provided with a feed inlet 1, and the side facing the extrusion mechanism 5 is provided with a discharge outlet 2; the feed inlet 1 and the discharge outlet 1 are fixedly connected.

[0026] In this invention, the outer edge of the auger 403 is in contact with the inner surface of the housing 402, and when the auger 403 stops rotating, it prevents the molten liquid from flowing out of the discharge port 2.

[0027] In one exemplary embodiment, such as Figure 2-4As shown, the extrusion mechanism 5 includes a push rod 501, a housing 502, a push plate 503, and a baffle plate 504. The push rod 501 is detachably connected to the top surface of the housing 502. The push end of the push rod 501 passes through the top surface of the housing 502 and is fixed to the push plate 503. A through hole 1 is opened on the top surface of the housing 502 near the end of the housing 402. A baffle plate 504 is fixed on the end of the push plate 503 facing the end of the housing 402. The top end of the baffle plate 504 passes through the through hole 1 and is located at the upper end of the housing 502. The end face away from the push plate 503 is in contact with the inner surface of the housing 502. A feed inlet 2 is opened on the side of the housing 502 facing the end of the housing 402, and a discharge outlet 3 is opened at the bottom. The feed inlet 2 is close to the top plate of the housing 502. The feed inlet 2 is fixedly connected to the discharge outlet 2. The discharge outlet 3 is fixedly connected to the discharge pipe 6.

[0028] In this invention, the baffle plate 504 is used to prevent the molten liquid inside the housing 402 from flowing into the upper end of the push plate 503; for example Figure 2 and Figure 4 As shown, the second housing 502 consists of two parts. The upper part is rectangular with an opening at the bottom, and the lower part is sealed by four triangular plates. The four triangular plates are inclined towards the center point, and a circular hole is opened at the center point to fix the discharge pipe 6. After the push rod 501 drives the push plate 503 to move upward and return to its original position, the bottom of the push plate 503 and the baffle plate 504 are higher than the feed inlet 2. That is to say, after the push rod 501 returns to its original position, the molten liquid in the first housing 402 flows smoothly into the second housing 502. Except for the end connected to the baffle plate 504, the other three ends of the push plate 503 are respectively attached to the inner surface of the second housing 502.

[0029] In one exemplary embodiment, such as Figure 2 As shown, the pressing mechanism 7 includes a housing 701, a push rod 702, and a pressure plate 703; the bottom end of the housing 701 is open; the inner top surface of the housing 701 is fixedly connected to multiple push rods 702, and the pushing end of the push rod 702 is detachably connected to the pressure plate 703 with its pushing end facing downward.

[0030] In this utility model, when multiple sizes of plates are required, only the pressure plate 703 and the forming mold 10 need to be replaced. The side of the pressure plate 703 is inverted convex shape. The pressure plate 703 is composed of two plates and is integrally formed. That is to say, the length and width of the upper plate are longer than the length and width of the lower plate. The side wall of the lower plate is in contact with the inner side wall of the forming mold 10. When the push rod 702 pushes the pressure plate 703 to the lowest point, the bottom surface of the upper plate of the pressure plate 703 is in contact with the top of the forming mold 10. The four sides of the upper plate of the pressure plate 703 are in contact with the inner side of the housing 701.

[0031] In one exemplary embodiment, such as Figure 2 and 5 As shown, the cooling mechanism 8 includes a housing 801, an air inlet pipe 802, and a refrigeration unit; the top surface of the housing 801 has a through hole 5, and the bottom surface has multiple through holes 8011; one end of the air inlet pipe 802 is fixedly connected to the through hole 5, and the other end of the air inlet pipe 802 is connected to the air outlet of the refrigeration unit.

[0032] In this utility model, the through hole 8011 is an air outlet, and the cooling mechanism 8 is used to cool the forming plates on multiple forming molds 10.

[0033] In one exemplary embodiment, such as Figure 1-2 As shown, the conveying mechanism 2 9 includes a housing 5 901, a transmission roller 902, a conveyor belt 903, and a motor 3; the top surface of the housing 5 901 is open; multiple transmission rollers 902 are fixed between the inner sides of the housing 5 901, and any transmission roller 902 is connected to the motor 3; the conveyor belt 903 is sleeved on the outside of the transmission roller 902; the conveyor belt 903 is detachably connected to multiple forming molds 10.

[0034] In one exemplary embodiment, such as Figure 2 As shown, the bottom of the casing 2502 is funnel-shaped.

[0035] In one exemplary embodiment, such as Figure 1-2 As shown, the bottom of the hot melt box 1 is fixed with multiple support legs 11; the bottom surface of the shell 402 is fixed with support legs 2 12; the two sides of the shell 502 are fixed with support legs 3 13 respectively; the two sides of the shell 701 are fixed with support legs 4 14 respectively; and the two sides of the shell 801 are fixed with multiple support legs 5 15 respectively.

[0036] In this utility model, a support leg 11 is fixed at each of the four corners of the bottom of the hot melt box 1; the control mechanism 15 is located at the lower end of the hot melt box 1.

[0037] In this invention, push rod 501 and push rod 702 are electric push rods; the control mechanism 15 is electrically connected to motor 201, motor 401, push rod 501, push rod 702, refrigeration unit, solenoid valve, and motor 3 to achieve the following operations: First, start motor 201 to stir the molten liquid. After stirring for a preset time, stop motor 201. Next, start motor 401 to transport the molten liquid in the hot melt box 1 to the shell 502. After a certain time, stop motor 401. Then, start motor 3 to move the empty molding die 10 on the conveyor belt 903 to the lower end of the discharge pipe 6. Stop motor 3. Finally, simultaneously start push rod 501. 1. The solenoid valve and push rod 501 push push plate 503 and baffle plate 504 to transport the molten liquid to the molding die 10. Then, the solenoid valve is closed first, and after push rod 501 returns to its original position, push rod 501 is closed again. Then, motor 3 is started again to move the molding die 10 with molten liquid on conveyor belt 903 to the lower end of pressure plate 703. Then, motor 3 is stopped. Then, push rod 702 is started to push pressure plate 703 downward to extrude and shape the molten liquid. After push rod 702 is reset, motor 3 is started again to move the shaped molten liquid to the lower end of through hole 8011. At the same time, the refrigeration machine is started to cool and shape the molten liquid on the molding die 10, and the finished product is produced.

[0038] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A polypropylene sheet forming device, characterized in that, include: A hot melt box (1); the hot melt box (1) is equipped with a stirring device (2), an exhaust valve (3) at the top, and a discharge port at the bottom; A conveying mechanism (4) for conveying molten liquid; the inlet of the conveying mechanism (4) is connected to the outlet; Extrusion mechanism (5); the feed inlet of the extrusion mechanism (5) is connected to the discharge outlet of the conveying mechanism (4); the discharge outlet of the extrusion mechanism (5) is fixed with a discharge pipe (6), and a solenoid valve is provided on the discharge pipe (6); Pressing mechanism (7); the pressing mechanism (7) is located at the end of the extrusion mechanism (5) away from the conveying mechanism (4); Cooling mechanism (8); the cooling mechanism (8) is located at the end of the pressing mechanism (7) away from the extrusion mechanism (5); A second conveying mechanism (9) for conveying the forming plate; the second conveying mechanism (9) is located at the lower end of the extrusion mechanism (5), the pressing mechanism (7) and the cooling mechanism (8); the second conveying mechanism (9) is provided with a plurality of forming molds (10).

2. The polypropylene sheet forming apparatus according to claim 1, characterized in that: The stirring device (2) includes a motor (201), a stirring shaft (202), and a stirring rod (203); The motor (201) is detachably connected to the top surface of the hot melt box (1); the output end of the motor (201) passes through the top surface of the hot melt box (1) and is fixed with the stirring shaft (202). The stirring shaft (202) is fixed with a plurality of stirring rods (203).

3. The polypropylene sheet forming apparatus according to claim 2, characterized in that: The conveying mechanism 1 (4) includes motor 2 (401), housing 1 (402) and auger (403); The second motor (401) is detachably connected to the side of the first housing (402) away from the extrusion mechanism (5), and the output end of the second motor (401) is fixed to the auger (403) through the side of the first housing (402). The top of the housing (402) is provided with a feed inlet and the side facing the extrusion mechanism (5) is provided with a discharge outlet. The feed inlet is fixedly connected to the discharge outlet.

4. The polypropylene sheet forming apparatus according to claim 3, characterized in that: The extrusion mechanism (5) includes a push rod (501), a housing (502), a push plate (503), and a baffle plate (504). The push rod one (501) is detachably connected to the top surface of the housing two (502), and the push end of the push rod one (501) passes through the top surface of the housing two (502) and is fixed with the push plate (503). A through hole is provided on the top surface of the second housing (502) near the end of the first housing (402); The push plate (503) is fixed with the baffle plate (504) at the end facing the housing one (402); the top end of the baffle plate (504) passes through the through hole one and is located at the upper end of the housing two (502), and the end face away from the push plate (503) is in contact with the inner surface of the housing two (502); The second housing (502) has a feed inlet 2 on its side facing the first housing (402) and a discharge outlet 3 on its bottom; the feed inlet 2 is close to the top plate of the second housing (502); The second inlet is fixedly connected to the second outlet; the third outlet is fixedly connected to the outlet pipe (6).

5. The polypropylene sheet forming apparatus according to claim 4, characterized in that: The pressing mechanism (7) includes a housing three (701), a push rod two (702), and a pressure plate (703); The bottom end of the third housing (701) is open; The inner top surface of the housing three (701) is fixedly connected to the plurality of push rods two (702), and the push end of the push rods two (702) is detachably connected to the pressure plate (703) with the push end facing downward.

6. The polypropylene sheet forming apparatus according to claim 5, characterized in that: The cooling mechanism (8) includes a housing (801), an air inlet pipe (802), and a refrigeration unit; The top surface of the housing four (801) is provided with a through hole five, and the bottom surface is provided with multiple through holes six (8011). One end of the air inlet pipe (802) is fixedly connected to the through hole five, and the other end of the air inlet pipe (802) is connected to the air outlet of the refrigeration unit.

7. A polypropylene sheet forming apparatus according to claim 6, characterized in that: The second conveying mechanism (9) includes a housing (901), a transmission roller (902), a conveyor belt (903), and a motor (903); The top surface of the housing five (901) is open; multiple transmission rollers (902) are fixed between the inner surfaces of the housing five (901), and any one of the transmission rollers (902) is connected to a motor three; The conveyor belt (903) is sleeved on the outside of the drive roller (902); The conveyor belt (903) is detachably connected to the plurality of the molding dies (10).

8. The polypropylene sheet forming apparatus according to claim 4, characterized in that: The bottom of the second shell (502) is funnel-shaped.

9. A polypropylene sheet forming apparatus according to claim 6, characterized in that: The bottom of the hot melt box (1) is fixed with multiple support legs (11); The bottom surface of the housing 1 (402) is fixed with a support leg 2 (12); Support legs (13) are fixed on both sides of the housing 2 (502); Support legs four (14) are fixed on both sides of the shell three (701); Multiple support legs (15) are fixed on both sides of the shell four (801).

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