Multi-layer co-extrusion sheet production line

Abstract

The invention discloses a multi-layer co-extrusion sheet production line which comprises an extrusion system, a distributor, an extrusion die, a three-roller calender, a cooling bracket, a traction machine, a multi-station winding system and an electric control system which are sequentially arranged from front to back. The distributor is constructed to receive materials of the three extruders, divide the materials into five layers and then extrude the materials from an outlet in a co-extrusion mode, the three-roller calender is movably arranged on the rear side of the extrusion die in the front-back direction and communicates with a roller temperature controller, the cooling bracket is erected between the three-roller calender and the traction machine, and a slitting device is arranged on the cooling bracket; the multi-station winding system comprises at least two winding stations, and the at least two winding stations are configured to alternately wind products; the electric control system is in signal connection with a driving device and an electronic component of each device; the production line meets the requirements of the market for high-yield, high-efficiency and low-energy-consumption production lines.

Description

Technical Field

[0001] This application relates to the technical field of plastic product production equipment, and particularly to a multi-layer co-extrusion sheet production line. Background Art

[0002] Currently, there are few production lines for five-layer co-extrusion sheets, and five extruders are often used to provide five layers of materials, which consumes a lot of energy. Moreover, in order to ensure uniform and clear layering of the multi-layer co-extrusion sheet, the production line runs at a slow speed, resulting in low output per unit time and low production efficiency. Summary of the Invention

[0003] To solve the above technical problems, the purpose of this application is to provide a multi-layer co-extrusion sheet production line with low energy consumption, high output, and high efficiency.

[0004] To achieve the above purpose, this application adopts the following technical scheme: A multi-layer co-extrusion sheet production line includes an extrusion system, a distributor, an extrusion die, a three-roll calender, a cooling bracket, a tractor, a multi-station winding system, and an electric control system, which are arranged in sequence from front to back. The extrusion system includes three extruders. The distributor includes three inlets respectively connected to the three extruders one by one and an outlet connected to the extrusion die. The distributor is configured to receive the materials from the three extruders, divide the materials into five layers, and co-extrude them from the outlet. The extrusion die has an extrusion outlet for the five layers of materials to be co-extruded in a sheet shape. The three-roll calender is movably arranged in the rear of the extrusion die in the front-back direction and is connected to a roll temperature controller, and the roll controller is used to adjust the roll temperature of the rolls of the three-roll calender. The cooling bracket is arranged between the three-roll calender and the tractor, and a slitting device is arranged on the cooling bracket. The tractor is located between the cooling bracket and the multi-station winding system and is configured to be able to pull the products on the cooling bracket to the multi-station winding system. The multi-station winding system includes at least two winding stations, and the at least two winding stations are configured to wind the products alternately. The electric control system is connected to the driving devices and electronic components of each device in a signal connection.

[0005] In the above technical scheme, further preferably, the three extruders are arranged in a fan shape in the front of the distributor, and the three extruders are all single-screw extruders.

[0006] In the above technical scheme, further preferably, it further includes a vacuum system, and the vacuum system is connected to the extrusion system and is configured to receive the moisture and gas discharged from each of the extruders.

[0007] In the above technical solution, it is further preferred that a screen changer and a metering pump are installed between the extrusion system and the distributor, each of the extruders has a discharge port for material output, each of the discharge ports is equipped with a screen changer and a metering pump, the screen changer is used to filter the material, and the metering pump is used to adjust the flow rate of the material delivered from the corresponding discharge port to the distributor.

[0008] In the above technical solution, it is further preferred that the three-roll calender includes an upper roller, a middle roller and a lower roller arranged in sequence from top to bottom, the extrusion port is toward between the middle roller and the lower roller, and the front end of the cooling bracket is located on the rear side of the upper roller.

[0009] In the above technical solution, it is further preferred that the cooling bracket includes a plurality of cooling rollers, a first bracket and a second bracket located at the rear side of the first bracket, the plurality of cooling rollers can be rotatably arranged on the first bracket and the second bracket around their own axis lines, the rear end portion of the first bracket can be slidably arranged on the front end portion of the second bracket along the front-to-back direction, the front end portion of the first bracket is installed on the three-roll calender, and the rear end portion of the second bracket is installed on the traction machine.

[0010] In the above technical solution, it is further preferred that the slitting device is installed on the first bracket, and the slitting device includes at least one pair of cutter assemblies arranged at intervals along the left-right direction, and each of the cutter assemblies can be movably arranged on the first bracket along the left-right direction.

[0011] In the above technical solution, it is further preferred that an operating table is provided at the cooling bracket, and the operating table includes a platform located on the upper side of the first bracket and stairs for operators to move from the ground to the platform, and the platform is installed on the first bracket adjacent to the cutting device, and a plurality of rollers are provided at the bottom of the stairs.

[0012] In the above technical solution, it is further preferred that the multi-station winding system includes two winding machines, and the two winding machines are arranged in sequence along the front-to-back direction, each of the winding machines includes a pair of winding shafts facing each other front and back, each of the winding shafts forms a winding station, and the two winding shafts on each of the winding machines are wound alternately.

[0013] In the above technical solution, it is further preferred that each of the winding shafts is transmission-connected to a winding-unloading mechanism, the moving mechanism comprises a push plate capable of moving in left and right directions and a winding-unloading cylinder driving the push plate to move in left and right directions, and the push plate is provided with a through hole for the winding shaft to pass through.

[0014] The present application has the following beneficial effects compared with the prior art: The multi-layer co-extrusion sheet production line of the present application realizes fully automated production. Five-layer co-extrusion sheets are extruded by three extruders, saving energy consumption, effectively improving the output and production efficiency of the multi-layer co-extrusion sheets, and meeting the market demand for high-yield, high-efficiency and low-energy consumption production lines. Brief Description of the Drawings

[0015] Figure 1 It is the front view of a multi-layer co-extrusion sheet production line provided by an embodiment of the present application; Figure 2 It is Figure 1 the top view of the multi-layer co-extrusion sheet production line in Figure 3 It is Figure 2 the schematic diagram of the connection position between the extrusion system and the extrusion die and the distributor in Figure 4 It is Figure 1 the side view of the slitting device in Figure 5 It is Figure 1 the side view of the operation table installed on the cooling bracket in Figure 6 It is Figure 1 the top view of the rewinder in

[0016] Wherein: 100, multi-layer co-extrusion sheet production line; 1, extruder; 2, distributor; 3, extrusion die; 4, three-roll calender; 41, upper roll; 42, middle roll; 43, lower roll; 5, cooling bracket; 51, cooling roll; 52, first bracket; 53, second bracket; 6, tractor; 7, elbow; 8, vacuum system; 9, screen changer; 10, metering pump; 11, roll temperature controller; 12, slitting device; 121, cutter assembly; 13, operation table; 131, platform; 132, staircase; 133, roller; 134, guardrail; 14, rewinder; 141, rewinding shaft; 142, frame; 143, drive motor; 144, uncoiling mechanism; 1441, push plate; 1442, uncoiling cylinder; 15, electric control system. Detailed Embodiments

[0017] To describe the technical content, structural features, achieved objectives and effects of the application in detail, the technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. In the following description, for the purpose of explanation, many specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments can also be implemented without these specific details or in the case of one or more equivalent arrangements. In addition, various exemplary embodiments can be different, but they do not have to be exclusive. For example, without departing from the inventive concept, the specific shapes, structures and characteristics of the exemplary embodiments can be used or implemented in another exemplary embodiment.

[0018] The embodiment of the present application provides a multi-layer co-extrusion sheet production line, and this sheet production line is applicable to the production of five-layer co-extrusion sheets. As Figure 1 、 2 shown, the multi-layer co-extrusion sheet production line 100 includes an extrusion system, a distributor 2, an extrusion die 3, a three-roll calender 4, a cooling bracket 5, a tractor 6, and a multi-station winding system arranged in sequence from front to back.

[0019] As Figure 2 、 3 shown, the extrusion system includes three extruders 1. All three extruders 1 are single-screw extruders. The distributor 2 includes three inlets respectively communicating with the three extruders 1 one by one and an outlet communicating with the extrusion die 3. The three extruders 1 are arranged in a fan shape on the front side of the distributor 2. One extruder 1 is the main extrusion machine located directly in front of the distributor 2, and the other two extruders 1 are auxiliary extrusion machines symmetrically arranged left and right with the main extrusion machine as the center. The left and right auxiliary extrusion machines are respectively connected to the distributor 2 through elbows 7, so that the material can be smoothly conveyed to the distributor 2; the fan-shaped distribution of the extruders 1 reduces the distance between the discharge ports of the left and right auxiliary extrusion machines and the distributor 2, improving the conveying efficiency and the output per unit time. In the embodiment of the present application, the middle main extrusion machine is an extruder with a screw diameter of 130 mm and a length-diameter ratio of 38:1, and the two auxiliary extrusion machines are both extruders with a screw diameter of 75 mm and a length-diameter ratio of 38:1. The main extrusion machine and the auxiliary extrusion machines are configured with a feeding system to be able to automatically feed materials into the main extrusion machine and the auxiliary extrusion machines to improve the feeding efficiency.

[0020] A vacuum system 8 is also configured at the extrusion system 1. The vacuum system 8 is in fluid communication with the exhaust ports of the respective extruders 1, and is used to receive the moisture and gas discharged from the respective extruders 1, avoiding the co-extrusion sheet being made with the material carrying air and moisture, effectively eliminating the bubbles and impurities in the co-extrusion sheet, and improving the quality of the product.

[0021] The distributor 2 is configured to divide the materials input from three inlets into five strands, co-extrude the five strands of materials into five layers in a channel, and then convey the five-layer materials to the extrusion die 3. The extrusion die 3 extrudes the five-layer materials in a sheet shape. The distributor 2 ensures clear and uniform layering of the five-layer materials. Through the distributor 2, the materials output from the three extruders 1 are divided into five layers and then co-extruded, saving energy and realizing the production of multi-layer co-extruded sheets, reducing the use of extruders, and effectively saving energy consumption.

[0022] A screen changer 9 and a metering pump 10 are installed between the extrusion system and the distributor 2. A screen changer 9 is arranged at the discharge port of each extruder 1. The screen changer 9 is used to filter the materials output from the corresponding extruder 1 to prevent impurities from entering the distributor 2 along with the completely plasticized materials. The impurities in the materials will affect the quality of the extruded co-extruded sheet. The metering pump 10 is used to adjust the flow rate of the materials conveyed from each extruder 1 to the distributor 2, so that the materials are evenly conveyed into the distributor 2, which is beneficial to the uniform and clear layering of the materials in the distributor 2.

[0023] As Figure 1 shown, the three-roll calender 4 is movably arranged in the front-rear direction at the rear side of the extrusion die 3 to calender and preliminarily cool the co-extruded sheet extruded by the extrusion die 3. The three-roll calender 4 includes an upper roll 41, a middle roll 42, and a lower roll 43 arranged in sequence from top to bottom. The upper roll 41, the middle roll 42, and the lower roll 43 are all rotatably arranged around their own axis lines. The extrusion port of the extrusion die 3 faces between the middle roll 42 and the lower roll 43 to extrude the co-extruded sheet onto the three-roll calender 4. The co-extruded sheet snakes around the middle roll 42 and the upper roll 41 from bottom to top, and finally is drawn out from the upper side of the upper roll 41 tangentially to the upper roll 41.

[0024] The three-roll calender 4 is connected to a roll temperature controller 11. The roll temperature controller 11 is connected to the upper roll 41, the middle roll 42, and the lower roll 43 to control the roll temperature of each roll, so that the three-roll calender 4 can calender the co-extruded sheet faster and better.

[0025] As Figure 1 、 2 shown, the cooling bracket 5 is erected between the three-roll calender 4 and the tractor 6. Since the co-extruded sheet drawn out from the three-roll calender 4 has not been cooled and formed yet, if the cooling bracket 5 is far away from the upper roll 41, the co-extruded sheet will sag due to suspension, resulting in uneven thickness of the co-extruded sheet. Therefore, in order to quickly receive the co-extruded sheet drawn out from the three-roll calender 4, the front end of the cooling bracket 5 is arranged at the rear side of the upper roll 41 to shorten the distance between the upper roll 41 and the cooling bracket 5.

[0026] Since the three-roll calender 4 moves backward away from the extrusion die 3 during the maintenance of the extrusion die 3 or when replacing its own rollers, the cooling bracket 5 connected to the three-roll calender 4 also moves backward. To prevent the equipment behind the rear side of the cooling bracket 5 from being frequently moved back and forth due to this, the cooling bracket 5 is a two-section cooling bracket. The cooling bracket 5 includes a plurality of cooling rollers 51, a first bracket 52, and a second bracket 53. The plurality of cooling rollers 51 are rotatably arranged on the first bracket 52 and the second bracket 53, used to support and convey the co-extruded sheet, and exchange heat with the co-extruded sheet to dissipate heat from the co-extruded sheet and achieve the purpose of cooling and forming. The second bracket 53 is arranged at the rear side of the first bracket 52. The front end of the first bracket 52 is installed on the three-roll calender 4, and the rear end of the first bracket 52 is slidably mounted on the front end of the second bracket 53 in the front-rear direction. The rear end of the second bracket 53 is installed on the tractor 6. When the three-roll calender 4 moves in the front-rear direction, the first bracket 52 moves relative to the second bracket 53 in the front-rear direction. A baffle is provided on the front end of the second bracket 53 to prevent the first bracket 52 from falling off the second bracket 53 and improve the safety of equipment operation.

[0027] As Figure 1 , 4 shown, a slitting device 12 is provided on the upper side of the first bracket 52 of the cooling bracket 5. The slitting device 12 includes at least a pair of cutter assemblies 121. The at least a pair of cutter assemblies 121 are spaced apart in the left-right direction, and each cutter assembly 121 is movably arranged on the first bracket 52 in the left-right direction. The slitting device 12 adjusts the positions of the respective cutter assemblies 121 according to production requirements to trim and slit the co-extruded sheet, making the sides of the final product flat and enabling the production of products with different widths in sequence.

[0028] As Figure 1 , 2 , 5 shown, an operating platform 13 is also provided at the first bracket 52. The operating platform 13 is for the operator to move from the ground to the upper side of the first bracket 52 to adjust each cutter assembly 121. The operating platform 13 includes a platform 131 located on the upper side of the first bracket 52 and a staircase 132 for the operator to move from the ground to the platform 131. The platform 131 is arranged adjacent to the slitting device 12 and fixed to the first bracket 52, enabling the operator to adjust the slitting device 12 on the platform 131. A plurality of rollers 133 are further provided at the bottom of the operating platform 13, enabling the operating platform 13 to move with the first bracket 52. A guardrail 134 is provided around the circumference of the platform 131 to improve the safety of the operator during operation.

[0029] The tractor 6 is used to draw the co-extruded sheet, draw the co-extruded sheet out from the three-roll calender 4, convey it on the cooling bracket 5, and then convey the co-extruded sheet to the multi-station winding system, providing traction force for the co-extruded sheet between the three-roll calender 4 and the multi-station winding system.

[0030] As Figure 1 , 2 , as shown in 6, the multi-station winding system includes at least two winding stations, each winding station is used to wind the product, and the two winding stations wind the product alternately, which can realize online roll change, save roll change time, and improve production efficiency. In the embodiment of the present application, the multi-station winding system includes two winding machines 14, and the two winding machines 14 are arranged in sequence along the front-rear direction. Each winding machine 14 includes a pair of winding shafts 141 that are opposite to each other in the front and rear. Each winding shaft 141 forms a winding station. The two winding shafts 141 on each winding machine 14 wind alternately. When the product on one winding shaft 141 is full, the product is quickly cut off, and the starting end of the product is wound on the other winding shaft 141 to start a new round of winding.

[0031] Each winding machine 14 includes a frame 142, a driving motor 143 and an unwinding mechanism 144. Each winding shaft 141 extends along the left-right direction and is rotatably supported on the frame 142, and is in transmission connection with the driving motor 143. The driving motor 143 drives each winding shaft 141 to rotate around its own axis to wind the product; each frame 142 is in transmission connection with an unwinding mechanism 144. The unwinding mechanism 144 includes a push plate 1441 that can move along the left-right direction and an unwinding cylinder 1442 that drives the push plate 1441 to move along the left-right direction. A through hole for the winding shaft 141 to pass through is provided on the push plate 1441. When the product on the winding shaft 141 is full, the unwinding cylinder 1442 drives the push plate 1441 to push the coil on the winding shaft 141 away from the winding shaft 141 to realize unwinding.

[0032] The multi-layer co-extrusion sheet production line 100 further includes an electric control system 15. The electric control system 15 is connected to the driving devices and electronic components of each device by signal. The electric control system 15 centrally controls each device to realize fully automatic production, effectively improving the output and production efficiency of the production line.

[0033] The above shows and describes the basic principle, main features and advantages of the present application. Those skilled in the art of this industry should understand that the present application is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present application. Without departing from the spirit and scope of the present application, the present application will have various changes and improvements. The scope of protection required by the present application is defined by the appended claims, the specification and their equivalents.

Claims

1. A multi-layer co-extrusion sheet production line, characterized in that: The invention comprises an extrusion system, a distributor, an extrusion die, a three-roll calender, a cooling bracket, a traction machine, a multi-station winding system and an electric control system which are arranged in sequence from front to back. The extrusion system comprises three extruders. The distributor comprises three inlets which are respectively connected to the three extruders and an outlet which is connected to the extrusion die. The distributor is configured to receive materials from the three extruders and divide the materials into five layers and then co-extrude them from the outlets. The extrusion die has an extrusion port for co-extruding the five layers of materials in sheet form. The three-roll calender can be movably arranged at the rear side of the extrusion die in the front-rear direction and is connected to a The roller temperature controller is connected, and the roller controller is used to adjust the roller temperature of the roller of the three-roll calender; the cooling bracket is erected between the three-roll calender and the traction machine, and the cooling bracket is provided with a slitting device; the traction machine is located between the cooling bracket and the multi-station winding system, and is configured to be able to pull the product on the cooling bracket to the multi-station winding system; the multi-station winding system includes at least two winding stations, and the at least two winding stations are configured to alternately wind the products; the electric control system is signal-connected with the drive devices and electronic components of each device.

2. The multi-layer co-extrusion sheet production line according to claim 1, characterized in that: The three extruders are arranged in a fan shape on the front side of the distributor, and all of the three extruders are single-screw extruders.

3. The multi-layer co-extrusion sheet production line according to claim 1, characterized in that: It also includes a vacuum system, which is connected to the extrusion system and is configured to receive moisture and gas discharged from each of the extruders.

4. The multi-layer co-extrusion sheet production line according to claim 1, characterized in that: A screen changer and a metering pump are installed between the extrusion system and the distributor. Each of the extruders has a discharge port for material output. Each of the discharge ports is equipped with a screen changer and a metering pump. The screen changer is used to filter the material, and the metering pump is used to adjust the flow rate of the material delivered from the corresponding discharge port to the distributor.

5. The multi-layer co-extrusion sheet production line according to claim 1, characterized in that: The three-roll calender comprises an upper roller, a middle roller and a lower roller arranged in sequence from top to bottom, the extrusion port faces between the middle roller and the lower roller, and the front end of the cooling bracket is located at the rear side of the upper roller.

6. The multi-layer co-extrusion sheet production line according to claim 1, characterized in that: The cooling bracket includes a plurality of cooling rollers, a first bracket and a second bracket located at the rear side of the first bracket. The plurality of cooling rollers can be rotatably arranged on the first bracket and the second bracket around their own axis lines. The rear end portion of the first bracket can be slidably arranged on the front end portion of the second bracket along the front-to-back direction. The front end portion of the first bracket is installed on the three-roll calender, and the rear end portion of the second bracket is installed on the traction machine.

7. The multi-layer co-extrusion sheet production line according to claim 6, characterized in that: The slitting device is installed on the first bracket, and comprises at least one pair of cutter assemblies arranged at intervals along the left-right direction, and each of the cutter assemblies is movably arranged on the first bracket along the left-right direction.

8. The multi-layer co-extrusion sheet production line according to claim 7, characterized in that: An operating table is arranged at the cooling bracket, and the operating table includes a platform located on the upper side of the first bracket and stairs for operators to move from the ground to the platform. The platform is installed on the first bracket adjacent to the slitting device, and a plurality of rollers are arranged at the bottom of the stairs.

9. The multi-layer co-extrusion sheet production line according to claim 1, characterized in that: The multi-station winding system includes two winding machines, which are arranged in sequence along the front-to-back direction. Each winding machine includes a pair of winding shafts facing each other front and back. Each winding shaft forms a winding station, and the two winding shafts on each winding machine are wound alternately.

10. The multi-layer co-extrusion sheet production line according to claim 9, characterized in that: Each of the winding shafts is connected to a roll unloading mechanism. The moving mechanism includes a push plate that can move in the left and right directions and a roll unloading cylinder that drives the push plate to move in the left and right directions. The push plate is provided with a through hole for the winding shaft to pass through.

Images