A PET plastic sheet extruder

Abstract

The present invention relates to the technical field of PET plastic sheet extruders, specifically to a PET plastic sheet extruder, comprising a feed pipe, one end of the feed pipe is fixedly connected to a back seat, a bottom plate is fixedly installed on the side wall of the back seat away from the feed pipe, a first closing plate and a second closing plate are fixedly installed on the two side walls of the bottom plate respectively, a top plate is fixedly connected to the top wall of the first closing plate and the second closing plate, and a cleaning device for cleaning waste in the bottom plate is fixedly installed on the bottom plate. The present invention installs a cleaning device inside the head of the PET plastic extruder, when the machine is turned on for PET plastic production, within a period of time after the machine is turned on, the cleaning device in the cavity is powered on and started, and the internal space of the cavity is cleaned once, so as to realize automatic cleaning of the inside of the cavity, and the cleaning of the head can be realized without manually removing the extruder head, thereby improving the quality of the finished PET sheet processing.

Description

Technical Field

[0001] The invention relates to the technical field of plastic sheet processing, in particular to a PET plastic sheet extruder. Background Art

[0002] PET plastic sheet is a new plastic product developed in recent years. The transparency of PET plastic sheet can be changed in real time according to specific requirements. Due to its good ductility and plasticity, it can be placed at home or in the office as a decoration. Even if it is burned when its life reaches the limit of recycling, it will not produce any polluting gas. It has good performance and practical performance and can be applied to all aspects of life. For this reason, a PET plastic sheet extruder was born.

[0003] The existing plastic sheet extruder consists of a feed hopper, a heating mechanism, and an extrusion device. The raw materials to be processed are manually poured into the feed hopper, and the raw materials enter the heating mechanism from the feed hopper. The heating mechanism is provided with a screw, and the heated raw materials are pushed into the extrusion device by the rotation of the screw. The heated raw materials are extruded from the nozzle of the extrusion device, and the extruded raw materials are attached to the cooling coil drum on the side. The cooling drum cools the plastic to form a finished plastic sheet.

[0004] However, we found during the processing that due to the long downtime, there would be plastic particles left over from the previous processing at the nozzle of the extrusion device, and the solidified plastic particles would be mixed into the plastic slurry being processed. At this time, the temperature in the plastic slurry was not enough to melt the solidified plastic particles, resulting in a decrease in the quality of the processed PET plastic sheet.

[0005] Therefore, a PET plastic sheet extruder is proposed to solve the above-mentioned technical problems. Summary of the invention

[0006] The object of the present invention is to provide a PET plastic sheet extruder, by installing an automatic waste cleaning device in the extruder head, when the machine is turned on for processing, the automatic cleaning device is powered on and started, and performs a horizontal reciprocating motion in the head to clean the solidified plastic waste, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A PET plastic sheet extruder, comprising:

[0009] A feeding pipe, one end of the feeding pipe is fixedly connected to a rear seat, a bottom plate is fixedly installed on the side wall of the rear seat away from the feeding pipe, a first closing plate and a second closing plate are fixedly installed on the two side walls of the bottom plate respectively, a top plate is fixedly connected to the top wall of the first closing plate and the second closing plate, one end of the first closing plate and the second closing plate is fixedly connected to an inclined plate, one end of the inclined plate away from the rear seat is fixedly connected to a pressure nozzle, and a second cylinder is fixedly installed on the top wall of the inclined plate;

[0010] Also includes:

[0011] A cleaning device is fixedly installed on the bottom plate and is used to clean the waste materials in the bottom plate.

[0012] Preferably, the cleaning device comprises:

[0013] A support frame, wherein the support frame is fixedly mounted on the top wall of the bottom plate;

[0014] A motor, wherein the motor is fixedly mounted on the top wall of the first closing plate;

[0015] A screw rod, the output end of the motor is fixedly mounted with a screw rod, and one end of the screw rod away from the motor is rotatably mounted on the support frame;

[0016] A slider, wherein the screw rod is spirally driven with a slider, and one end of the slider is fixedly connected with a retractable rod;

[0017] A horizontal scraper is fixedly connected to one end of the sliding block, and the horizontal scraper is located in the feed trough.

[0018] Preferably, cleaning brushes are fixedly mounted on the top wall and the bottom wall of the horizontal scraper.

[0019] Preferably, a first cylinder is fixedly mounted on the top wall of the first closing plate, a first slide groove is provided on the first closing plate, a vertical scraper is fixedly mounted on the output end of the first cylinder, and the vertical scraper is located in the first slide groove.

[0020] Preferably, a waste trough is provided in the first closing plate, and the vertical scraper is located directly above the waste trough.

[0021] Preferably, a contraction groove is provided on the inner wall of the first closing plate, a contraction box is fixedly installed in the contraction groove, a plastic baffle is fixedly connected to the side wall of the contraction box, and an air pump is fixedly installed on the side wall of the contraction box away from the bottom plate.

[0022] Preferably, a second sealing plate is fixedly connected to one end of the bottom plate close to the inclined plate, and a first sealing plate symmetrical to the second sealing plate is fixedly connected to one end of the inclined plate close to the bottom plate.

[0023] Preferably, a slide groove is provided in the second sealing plate, a limiting rod is fixedly connected to the side wall of the slide groove, a sliding plate is slidably sleeved on the side wall of the limiting rod, and a second spring is outer-mounted on the limiting rod.

[0024] Preferably, elastic mechanisms are fixedly mounted on the top wall of the first closing plate and on the inner wall of the waste trough.

[0025] Preferably, the elastic mechanism comprises:

[0026] A supporting block, wherein a fixed block is fixedly mounted on the bottom plate, a side wall of the fixed block is fixedly connected to a first electric block, and the first electric block is elastically connected to a second electric block via a second spring.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. Install a cleaning device inside the die head of the PET plastic extruder. When the machine is turned on for PET plastic production, the cleaning device in the cavity is powered on and started within a period of time after the machine is turned on to clean the internal space of the die head, thereby automatically cleaning the inside of the cavity. The die head can be cleaned without manually removing the extruder head, thereby improving the quality of PET sheet finished product processing.

[0029] 2. A first support plate is fixedly installed at one end of the machine head, and two sliding plates that can move relative to each other are installed on the top of the machine head. The two sliding plates that can move relative to each other are used to seal the interior of the machine head, which can ensure the smooth operation of the cleaning device and the sealing of the interior of the machine head.

[0030] 3. An elastic mechanism for automatically triggering the start of the cleaning device is fixedly installed on the top wall of the machine head. When the horizontal scraper contacts the second electric block of the first electric block on the elastic mechanism, the first cylinder is powered off and restored to its initial state, and the output end of the first cylinder is retracted into the cavity of the first cylinder, completing the function of automatically starting and automatically shutting down the cleaning device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the internal structure of the bottom plate of the present invention;

[0033] Figure 3 A cross-sectional view of a first sealing plate and a second sealing plate of the present invention;

[0034] Figure 4 It is a schematic diagram of the elastic mechanism of the present invention;

[0035] Figure 5This is a schematic diagram of the installation structure of the first sealing plate and the second sealing plate of the present invention;

[0036] Figure 6 It is a side view of the overall structure of the present invention.

[0037] In the figure: 1. bottom plate; 2. inclined plate; 3. back seat; 4. feed pipe; 5. first closing plate; 7. vacuum pump; 8. first cylinder; 9. vertical scraper; 10. motor; 11. screw; 12. contraction groove; 13. contraction box; 14. waste chute; 15. horizontal scraper; 16. support frame; 17. pressure nozzle; 18. second sealing plate; 19. first sealing plate; 20. limit rod; 21. slider; 22. first slide groove; 23. contraction rod; 24. first spring; 25. feed chute; 26. first electric block; 27. second electric block; 28. fixed block; 29. ​​plastic baffle; 30. sliding plate; 31. cleaning brush; 32. second spring; 33. second cylinder; 34. top plate; 35. second closing plate. DETAILED DESCRIPTION

[0038] 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 described embodiments 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.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] See also Figures 1 to 6 The present invention provides a PET plastic sheet extruder, and the technical solution is as follows:

[0042] A PET plastic sheet extruder, comprising:

[0043] A feed pipe 4, one end of which is fixedly connected to a rear seat 3, a bottom plate 1 is fixedly mounted on a side wall of the rear seat 3 away from the feed pipe 4, a first closing plate 5 and a second closing plate 35 are fixedly mounted on both side walls of the bottom plate 1, a top plate 34 is fixedly mounted on the top walls of the first closing plate 5 and the second closing plate 35, one end of the first closing plate 5 and the second closing plate 35 are fixedly mounted to an inclined plate 2, a pressure nozzle 17 is fixedly mounted on the end of the inclined plate 2 away from the rear seat 3, and a second cylinder 33 is fixedly mounted on the top wall of the inclined plate 2;

[0044] During processing, the power of the whole machine is manually started, the raw materials to be processed are poured into the feed hopper, the raw materials enter the heating device, and the pushing mechanism in the heating device pushes the melted plastic slurry forward. The plastic slurry is pushed to the feed pipe 4, and enters the cavity 25 formed by the bottom plate 1, the top plate 34, the first closing plate 5 and the second closing plate 35 through the feed pipe 4. Due to the continuous rotation of the pushing mechanism, the slurry is continuously pushed to the other end of the bottom plate 1, extruded from the pressure nozzle 17, attached to the coil drum, cooled and formed into a finished plastic sheet. When the thickness of the PET plastic sheet needs to be adjusted, the output end of the second cylinder 33 is adjusted, one end of the pressure nozzle 17 is deformed, and then the position of the pressure nozzle is adjusted, thereby achieving the purpose of adjusting the thickness of the PET sheet.

[0045] The heating device mentioned in the present invention is a twin-screw plastic heating extruder in the prior art, and can also be other devices capable of heating and extruding plastic. The winding drum mentioned in the present invention can be an existing plastic cooling drum machine, and can also be other equipment capable of cooling and curling plastic sheets.

[0046] Also includes:

[0047] A cleaning device is fixedly mounted on the bottom plate 1 and is used to clean the waste materials in the bottom plate 1 .

[0048] After one processing is completed, after a period of power outage, many waste small plastic particles will solidify in the cavity of the bottom plate 1, affecting the quality of the next PET plastic sheet processing. When the power of the device is manually started, the cleaning device is started, and the inside of the cavity of the bottom plate 1 is cleaned by the cleaning device, so that the head of the extruder is cleaned once before processing to ensure the quality of plastic sheet processing.

[0049] As an embodiment of the present invention, refer to Figure 1 , the cleaning device includes:

[0050] A support frame 16 is fixedly mounted on the top wall of the bottom plate 1;

[0051] A motor 10 is fixedly mounted on the first closing plate 5;

[0052] The screw 11 is fixedly mounted on the output end of the motor 10, and the end of the screw 11 away from the motor 10 is rotatably mounted on the support frame 16;

[0053] A slider 21 is provided on the screw rod 11 for spiral transmission;

[0054] Horizontal scraper 15 : One end of the sliding block 21 is fixedly connected with the horizontal scraper 15 , and the horizontal scraper 15 is located in the cavity 25 .

[0055] A support frame 16 is fixedly installed on the top wall of the bottom plate 1. A motor 10 is fixedly installed on the first end of the top wall of the bottom plate 1 away from the support frame 16. A screw 11 is fixedly installed on the output end of the motor 10. The end of the screw 11 away from the motor 10 is rotatably installed on the support frame 16. When the power supply system of the equipment is manually turned on, the power supply of the motor 10 is also turned on. The motor 10 is powered on and rotates, driving the screw 11 to rotate. After the screw 11 rotates, a horizontal thrust is generated on the slider 21, thereby moving in the horizontal direction. When the motor 10 rotates, the slider 21 moves in the direction where the motor 10 is located, thereby driving the horizontal scraper 15 fixedly connected to the slider 21 to the direction where the motor 10 is located. The horizontal scraper 15 moves in the direction of the motor 10, thereby forming a relative sliding in the cavity of the bottom plate 1, and the horizontal scraper 15 cleans the slide groove of the bottom plate 1. After the motor 10 rotates clockwise for a period of time, the motor 10 changes to counterclockwise rotation, and the slider 21 drives the horizontal scraper 15 to move in the direction of the support frame 16. After returning to the original position, the motor 10 stops rotating. In the above process, before the heated plastic slurry enters the bottom plate 1, the horizontal scraper 15 is used to scrape the inner wall of the bottom plate 1 twice, thereby completing the cleaning of the inner wall of the bottom plate 1, and realizing that the inside of the cavity 25 can be cleaned without manually disassembling the extruder head.

[0056] As an embodiment of the present invention, refer to Figure 2 A cleaning brush 31 is fixedly mounted on the top wall and the bottom wall of the horizontal scraper 15.

[0057] Cleaning brushes 31 are fixedly installed on the top and bottom walls of the horizontal scraper 15. When the horizontal scraper 15 moves toward the direction of the motor 10, the cleaning brush 31 on the horizontal scraper 15 contacts the inner wall of the bottom plate 1. The cleaning brush 31 can better contact the inner wall of the bottom plate 1, and comprehensively clean the solid particles attached to the inner wall of the bottom plate 1, thereby improving the completeness of the horizontal scraper 15 cleaning the inner wall of the bottom plate 1.

[0058] As an embodiment of the present invention, refer to Figure 2 A first closing plate 5 is fixedly mounted on the side wall of the bottom plate 1, a first cylinder 8 is fixedly mounted on the top wall of the first closing plate 5, a first slide groove 22 is opened on the first closing plate 5, a vertical scraper 9 is fixedly mounted on the output end of the first cylinder 8, and the vertical scraper 9 is located in the first slide groove 22.

[0059] A first closing plate 5 is fixedly mounted on the side wall of the bottom plate 1, and the side wall of the bottom plate 1 is blocked by the first closing plate 5 to ensure that the melted plastic slurry does not flow out from the side of the bottom plate 1 after entering the chute of the bottom plate 1. A first vertical chute 22 is opened on the top wall of the first closing plate 5, and a first cylinder 8 is fixedly mounted on the top wall of the first closing plate 5. The plane of the first cylinder 8 and the first chute 22 are both placed vertically. A vertical scraper 9 is fixedly connected to the output end of the first cylinder 8. When the horizontal scraper 15 moves to the position aligned with the first chute 22, the first cylinder 8 is moved vertically to the output end of the first cylinder 8. When the vertical scrapers 9 are in contact with each other, the first cylinder 8 is powered on and started, pushing the vertical scraper 9 downward. The vertical scraper 9 moves downward along the first slide groove 22. As the vertical scraper 9 moves downward, the vertical scraper 9 scrapes the plastic particles on the side wall of the horizontal scraper 15 downward, thereby completing the cleaning of the solidified plastic particles on the side wall of the horizontal scraper 15, ensuring that when the plastic slurry is extruded, there are fewer solid plastic particles on the horizontal scraper 15, and the impact on the extruded plastic slurry is smaller, thereby improving the quality of plastic extrusion sheet processing.

[0060] As an embodiment of the present invention, refer to Figure 2 A waste trough 14 is provided in the first closing plate 5 , and the vertical scraper 9 is located directly above the waste trough 14 .

[0061] A waste trough 14 is opened in the first closing plate 5. When the horizontal scraper 15 moves to a position close to the motor 10, the side wall of the horizontal scraper 15 is aligned with the waste trough 14, and the solid plastic particles scraped off by the horizontal scraper 15 enter the waste trough 14. At this time, the vertical scraper 9 moves downward to clean the side wall of the horizontal scraper 15, and pushes the plastic particles attached to the side wall of the horizontal scraper 15 into the waste trough 14, thereby improving the cleaning effect of the cleaning device on the inside of the bottom plate 1.

[0062] As an embodiment of the present invention, refer to Figure 2 A contraction groove 12 is provided on the inner wall of the first closing plate 5, a contraction box 13 is fixedly installed in the contraction groove 12, a plastic baffle 29 is fixedly connected to the side wall of the contraction box 13, and an air pump 7 is fixedly installed on the side wall of the contraction box 13 away from the bottom plate 1.

[0063] A contraction groove 12 is provided on the first closing plate 5, and a contraction box 13 is fixedly installed on the side wall of the contraction groove 12. The contraction box 13 is a retractable contraction air box, and a slide groove is built in the contraction box 13. An air pump 7 is fixedly installed on the side wall of the contraction box 13, and the air pump 7 is connected to the cavity of the contraction box 13. The contraction box 13 is made of soft rubber material and has the ductility of stretching and shrinking. When the motor 10 is started, the air pump 7 is also powered on and started at the same time to pump gas to the outer wall of the contraction box 13, and the gas pressure in the contraction box 13 is reduced. The contraction box 13 is pushed by the atmospheric pressure and contracts, and the contraction box 13 leaves the top of the waste trough 14. At this time, the waste trough 14 is in an open state. When the horizontal scraper 15 moves to the position of the waste trough 14 in the direction of the motor 10, the horizontal scraper 15 The cleaned solid waste particles fall into the waste trough 14. When the contraction box 13 contracts, it makes room for the vertical scraper 9 to move. The vertical scraper 9 moves downward as the first cylinder 8 pushes the solid plastic particles attached to the horizontal scraper 15 into the waste trough 14, thereby completing the cleaning process of the plastic waste. When the vertical scraper 9 completes the cleaning of the horizontal scraper 15, the motor 10 rotates counterclockwise, and the horizontal scraper 15 moves toward the support frame 16. The vacuum pump 7 is powered on and started to pump gas into the slide groove of the contraction box 13, and increase the gas pressure in the contraction box 13, so that the contraction box 13 returns to the open state, and the contraction box 13 is tightly attached to the rear seat 3 again, forming a seal with the bottom plate 1. While ensuring the sealing of the bottom plate 1, it can also ensure the convenience of waste cleaning.

[0064] As an embodiment of the present invention, refer to Figure 3 An inclined plate 2 is fixedly mounted on the top wall of the bottom plate 1 , a second sealing plate 18 is fixedly connected to one end close to the inclined plate 2 , and a first sealing plate 19 symmetrical to the second sealing plate 18 is fixedly connected to one end of the inclined plate 2 close to the bottom plate 1 .

[0065] A second sealing plate 18 is fixedly connected to one end of the top plate close to the inclined plate 2, and a first sealing plate 19 is fixedly installed at one end of the inclined plate 2 close to and away from the pressure nozzle 17. Since a horizontal scraper 15 that can be horizontally moved is slidably installed on the bottom plate 1, it is necessary to reserve a movable space for the horizontal scraper 15 on the bottom plate 1, and a second sealing plate 18 is fixedly installed on the top plate, and a first sealing plate 19 symmetrical to the second sealing plate 18 is fixedly installed on the inclined plate 2. The second sealing plate 18 and the first sealing plate 19 are used to seal the slide groove on the bottom plate 1 to ensure that the plastic slurry in the bottom plate 1 will not flow out from the notch at the upper end of the bottom plate 1, thereby ensuring the sealing of the entire extruder head and ensuring the smooth progress of the processing.

[0066] As an embodiment of the present invention, refer to Figure 4A slide groove is provided on the first sealing plate 19 and the second sealing plate 18. A limit rod 20 is fixedly connected to the bottom wall of the slide groove. A sliding plate 30 is slidably sleeved on the side wall of the limit rod 20. The sliding plate 30 is located in the slide groove. A first spring 24 is sleeved on the outer wall of the limit rod 20.

[0067] When the horizontal scraper 15 moves toward the direction where the motor 10 is located, the top of the horizontal scraper 15 contacts the sliding plate 30. During the movement of the horizontal scraper 15, the thickness of the horizontal scraper 15 will generate thrust on the sliding plates 30 on both sides. The sliding plates 30 generate a compressive thrust on the first spring 24, and the sliding plates 30 move toward the bottom wall of the slide groove, reserving movable space for the moving direction of the horizontal scraper 15. When the horizontal scraper 15 returns to its original position, the thrust applied to the sliding plate 30 is canceled. At this time, the pressure on the first spring 24 is canceled, and the first spring 24 moves the sliding plate 30 to the opening of the slide groove by elastic force. The sliding plates 30 on the second support plate and the third support plate are connected to each other to form a seal, thereby improving the sealing of the overall extruder head.

[0068] As an embodiment of the present invention, refer to Figure 2 Elastic mechanisms are fixedly installed on the top wall of the first closing plate 5 and in the waste groove 14.

[0069] When the horizontal scraper 15 moves in the direction of the motor 10, the top of the horizontal scraper 15 contacts the elastic mechanism on the first closing plate 5, exerting pressure on the first elastic mechanism, the elastic mechanism disconnects the power supply of the motor 10, the motor 10 stops rotating, and the horizontal scraper 15 stops moving in the direction of the motor 10. After the elastic mechanism on the first closing plate 5 is subjected to pressure, the first cylinder 8 is powered on and started, pushing the vertical scraper 9 downward, and the vertical scraper 9 cleans the side wall of the horizontal scraper 15. When the vertical scraper 9 moves into the waste trough 14, the bottom wall of the vertical scraper 9 contacts the elastic mechanism in the waste trough 14, the power supply of the motor 10 is reversed, the motor 10 rotates counterclockwise, and the horizontal scraper 15 is rotated and moved to the initial position. At this time, the first cylinder 8 is powered off and restored to the initial state, and the output end of the first cylinder 8 is retracted into the cavity of the first cylinder 8, completing the function of automatically starting and automatically shutting down the cleaning device.

[0070] As an embodiment of the present invention, refer to Figure 3 , the elastic mechanism includes:

[0071] The fixing block 28 is fixedly mounted on the bottom plate 1 , the side wall of the fixing block 28 is fixedly connected to the second electric block 27 , and the inner bottom wall of the fixing block 28 is elastically connected to the first electric block 26 via a second spring 32 .

[0072] A fixing block 28 is fixedly installed on the top wall of the bottom plate 1, and a first electric block 26 is fixedly connected to the side wall of the fixing block 28. When the horizontal scraper 15 moves to the position where the motor 10 is located, the horizontal scraper 15 contacts and applies a thrust to the second electric block 27. The second electric block 27 compresses the second spring 32 and moves in the direction of the first electric block 26. The second electric block 27 contacts the first electric block 26, thereby disconnecting the power supply of the motor 10, and the motor 10 stops rotating. When the second electric block 27 contacts the first electric block 26, the first cylinder 8 is energized. At start-up, the output end of the first cylinder 8 pushes the vertical scraper 9 downward, thereby cleaning the plastic particles on the horizontal scraper 15. When the bottom wall of the vertical scraper 9 contacts the second electric block 27 on the elastic mechanism in the waste trough 14, pressure is applied to the second electric block 27 to push the second electric block 27 downward. When the second electric block 27 contacts the first electric block 26, the power supply of the motor 10 is reversed, and the motor 10 rotates counterclockwise to move the horizontal scraper 15 to its original position, thereby completing the overall cleaning process.

[0073] Working principle: Manually start the power supply of the head system, the power supply of the motor 10 on the bottom plate 1 is turned on, the motor 10 drives the screw 11 to rotate, and the horizontal scraper 15 moves in the direction of the motor 10 to clean the inner wall of the bottom plate 1. Since one end of the retracting rod 23 is an oblique mouth, in the process of moving in the direction of the motor 10, a horizontal thrust is applied to the sliding plate 30 on the second sealing plate 18 and the first sealing plate 19, so as to continue to move forward. When the horizontal scraper 15 moves to a certain distance from the motor 10, the horizontal scraper 15 contacts the elastic mechanism located on the first closing plate 5 and compresses the elastic mechanism, the power supply of the motor 10 is disconnected, the power supply of the first cylinder 8 is turned on, the output end of the first cylinder 8 moves downward, and the vertical scraper 9 moves downward to the horizontal The side wall of the scraper 15 is cleaned, the solid particles on the horizontal scraper 15 are pushed into the waste trough 14, and the plastic solid particles are collected into the waste trough 14, completing a cleaning process. When the vertical scraper 9 moves downward to the position of contacting the elastic mechanism, the vertical scraper 9 squeezes the elastic mechanism located in the waste trough, the power of the first cylinder 8 is disconnected, and the power of the motor 10 is reversely connected. The motor 10 rotates counterclockwise, and the horizontal scraper 15 moves away from the motor 10, canceling the thrust on the sliding plate 30. The two sliding plates 30 are restored to a sealed state by the elastic force of the first spring 24, thereby forming a complete cleaning process. During the cleaning process, the sealing of the machine head can also be ensured, thereby improving the quality of the extrusion of the finished PET plastic sheet.

[0074] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A PET plastic sheet extruder, comprising: A feeding pipe (4), one end of the feeding pipe (4) is fixedly connected to a rear seat (3), a bottom plate (1) is fixedly installed on the side wall of the rear seat (3) away from the feeding pipe (4), a first closing plate (5) and a second closing plate (35) are fixedly installed on the two side walls of the bottom plate (1), a top plate (34) is fixedly connected to the top wall of the first closing plate (5) and the second closing plate (35), one end of the first closing plate (5) and the second closing plate (35) are fixedly connected to an inclined plate (2), one end of the inclined plate (2) away from the rear seat (3) is fixedly connected to a pressure nozzle (17), and a second cylinder (33) is fixedly installed on the top wall of the inclined plate (2); characterized in that it also includes: A cleaning device, the bottom plate (1) is fixedly mounted with a cleaning device for cleaning waste materials in the bottom plate (1); the cleaning device comprises: a support frame (16), the support frame (16) is fixedly mounted on the top wall of the bottom plate (1); a motor (10), the motor (10) is fixedly mounted on the top wall of the first closing plate (5); a screw (11), the output end of the motor (10) is fixedly mounted with a screw (11), and the end of the screw (11) away from the motor (10) is rotatably mounted on the support frame (16); a slider (21), the screw (11) is spirally driven with a slider (21), and one end of the slider (21) is fixedly connected to a retractable rod (23); a horizontal scraper (15), one end of the slider (21) is fixedly connected to the horizontal scraper (15), and the horizontal scraper (15) is located in the feed trough (25); Cleaning brushes (31) are fixedly mounted on the top wall and the bottom wall of the horizontal scraper (15); A first cylinder (8) is fixedly mounted on the top wall of the first closing plate (5), a first slide groove (22) is provided on the first closing plate (5), a vertical scraper (9) is fixedly mounted on the output end of the first cylinder (8), and the vertical scraper (9) is located in the first slide groove (22); A waste trough (14) is provided in the first closing plate (5), and the vertical scraper (9) is located directly above the waste trough (14); A contraction groove (12) is provided on the inner wall of the first closing plate (5), a contraction box (13) is fixedly installed in the contraction groove (12), a plastic baffle (29) is fixedly connected to the side wall of the contraction box (13), and an air pump (7) is fixedly installed on the side wall of the contraction box (13) at one end away from the bottom plate (1). When the air pump (7) is started, the contraction box (13) contracts, and the contraction box (13) leaves the top of the waste trough (14). The waste trough (14) is in an open state, and the solid waste particles swept by the horizontal scraper (15) fall into the waste trough (14). When the contraction box (13) contracts, a moving space is vacated for the vertical scraper (9). The vertical scraper (9) moves downward with the push of the first cylinder (8), and pushes the solid plastic particles attached to the horizontal scraper (15) into the waste trough (14); A second sealing plate (18) is fixedly connected to one end of the bottom plate (1) close to the inclined plate (2), and a first sealing plate (19) symmetrical to the second sealing plate (18) is fixedly connected to one end of the inclined plate (2) close to the bottom plate (1).

2. A PET plastic sheet extruder according to claim 1, characterized in that: The second sealing plate (18) A slide groove is provided on the first sealing plate (19), and a limit rod (20) is fixedly connected to the side wall of the slide groove. A sliding plate (30) is slidably sleeved on the side wall of the rod (20), and a first spring (24) is outer-mounted on the limiting rod (20).

3. A PET plastic sheet extruder according to claim 1, characterized in that: Elastic mechanisms are fixedly mounted on the top wall of the first closing plate (5) and on the inner wall of the waste trough (14).

4. A PET plastic sheet extruder according to claim 3, characterized in that: The elastic mechanism comprises: A fixed block (28), the base plate (1) having the fixed block (28) fixedly mounted thereon, the side wall of the fixed block (28) being fixedly connected to the second electric block (27), and the inner bottom wall of the fixed block (28) being elastically connected to the first electric block (26) via a second spring (32).

Images