Servo motor vector closed-loop precision control device of EPE extrusion equipment
By using vector closed-loop precision control technology of servo motors and servo controllers in pearl cotton extrusion equipment, the product quality instability caused by fluctuations in screw speed and barrel pressure is solved, and higher bubble formation rate and product quality are achieved, and production costs and energy consumption are reduced.
Patent Information
- Application Number
- CN202421710036.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-07-19
AI Technical Summary
During the production process, the existing pearl cotton extrusion equipment fluctuates greatly in the screw speed and barrel pressure, resulting in poor foaming quality stability, requiring manual real-time monitoring and operation, which is prone to decline in production quality due to human errors.
The vector closed-loop precision control is carried out by using servo motors and servo controllers, and the precise control of the extrusion screw speed and barrel pressure is achieved through the encoder and pressure sensor to form a closed-loop control system.
The bubble formation rate and product quality are improved, the average distribution of weight per unit square is reduced, production costs are saved, and the servo motor achieves higher control accuracy and energy-saving effects than AC motors.
Smart Images
Figure CN223030333U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of EPE foaming production, in particular to a servo motor vector closed-loop precision control device for an EPE (Expanded Polyethylene) extrusion equipment. Background Art
[0002] EPE (Expanded Polyethylene) is a plastic product formed by physical foaming of low-density polyethylene (LDPE) through a special EPE extrusion equipment with the addition of butane foaming agent and monoglyceride anti-shrinkage agent, and is widely used in various industries such as industry, agriculture, and logistics. At present, the extrusion equipment of EPE adopts an AC motor for driving, and the extrusion speed is controlled by an inverter. During extrusion, butane foaming agent and foaming aid monoglyceride are added. During the forming process, strict requirements are imposed on the screw extrusion amount (speed) and barrel pressure. The fluctuations of the screw speed and barrel pressure directly affect the foaming ratio and product quality, and a closed-loop control is not formed. The screw speed and barrel pressure fluctuate greatly during the production process, and the stability of the foaming forming quality is poor. It is necessary for operators to monitor the screw speed and pressure in real time and manually operate the AC motor according to the situation to ensure the normal operation of the EPE extrusion equipment. Manual monitoring and operation are prone to production quality decline due to human errors, which is time-consuming, laborious, and costly. Content of the Utility Model
[0003] The technical solution adopted by the utility model to solve the above technical problems is as follows:
[0004] A servo motor vector closed-loop precision control device for an EPE extrusion equipment includes an extruder, a reducer, and a pulley arranged in sequence. The extruder has an extrusion screw, and the extrusion screw is driven by the reducer and the pulley. A monoglyceride feed port, a butane feed port, and a pressure gauge are arranged on the extruder. One-way valves are arranged at both the monoglyceride feed port and the butane feed port. The device further includes a servo motor and a servo controller. The pulley is controlled by the servo motor to move. The servo motor and the servo controller are connected by an encoder control line. A pressure sensor is arranged at the pressure gauge, and the pressure sensor is connected to the servo controller through a pressure feedback line.
[0005] Further, the utility model further includes a screen changer, a forming die, and a cooling air ring arranged in sequence at the discharge end of the extruder.
[0006] Further, the servo controller is connected with a control panel.
[0007] During production, raw materials such as polyethylene (LDPE), glycerol monostearate, and butane are injected into the extruder. The servo controller controls the rotation of the servo motor, which drives the extrusion screw to rotate through a pulley and a reducer. The pressure and rotation speed during the extrusion production process are precisely controlled in a vector closed-loop manner through the servo controller and the servo motor. After extrusion, the EPE is filtered through a screen changer and then extruded and formed through a forming die, passes through a cooling air ring, and then undergoes traction and stretching to complete the production of the product.
[0008] The beneficial effects of the present utility model are as follows: The drive of the EPE extrusion forming screw is changed from an AC motor to a vector closed-loop control by a servo motor and a servo controller. The control precision of the screw rotation speed and the pressure of the extruder is high, and the operation is stable, improving the foaming rate. Due to the stable and precise control of the rotation speed and pressure, the quality of its products can be significantly improved, the gram weight per unit square is evenly distributed and reduced, saving production costs. The servo motor can achieve energy saving compared with the AC motor, and the structure of the present utility model is simple, with high control precision and low maintenance costs. Brief Description of the Drawings
[0009] Figure 1 It is a schematic structural diagram of the present utility model.
[0010] As shown in the figure: 1. Extruder; 2. Screen changer; 3. Cooling air ring; 4. Forming die; 5. Pressure gauge; 6. Pressure sensor; 7. Reducer; 8. Pulley; 9. Pressure feedback line; 10. Servo motor; 11. Check valve; 12. Encoder control line; 13. Control panel; 14. Glycerol monostearate feed port; 15. Butane feed port; 16. Servo controller. Detailed Embodiment
[0011] The present utility model will be further described below in conjunction with the drawings and embodiments.
[0012] As Figure 1 shown, the servo motor vector closed-loop precision control device of the EPE extrusion equipment includes an extruder 1, a reducer 7, and a pulley 8 arranged in sequence. The extruder 1 has an extrusion screw, and the extrusion screw is driven by the pulley 8 and the reducer 7 to rotate. A glycerol monostearate feed port 14, a butane feed port 15, and a pressure gauge 5 are provided on the extruder 1. Check valves 11 are provided at both the glycerol monostearate feed port 14 and the butane feed port 15 for adding foaming agents and anti-shrinkage agents such as glycerol monostearate and butane during the production process. The check valve 11 prevents the added production materials from flowing back and affecting the foaming rate of the EPE. The pressure gauge 5 real-time displays the pressure at the discharge port of the extruder 1.
[0013] The utility model further includes a servo controller 16 and a servo motor 10. The pulley 8 is controlled to move by the servo motor 10. The servo motor 10 and the servo controller 16 are connected through an encoder control line 12. The servo controller 16 issues commands to control the operation of the servo motor 10 according to the rotational speed of the servo motor fed back by the encoder control line 12, thereby realizing the closed-loop vector control of the rotational speed of the extrusion screw.
[0014] A pressure sensor 6 is further provided at the pressure gauge 5. The pressure sensor 6 is connected to the servo controller 16 through a pressure feedback line 9 to feed back pressure data to the servo controller 16 in real time. The servo controller 16 performs closed-loop precision control on the servo motor 10 in real time according to the fed-back pressure data, always keeping the extrusion production in a stable working state.
[0015] To more conveniently operate and control the servo motor 10 and the servo controller 16, the servo controller 16 is connected with a control panel 13, which facilitates the operator to perform production operations through the control panel 13.
[0016] The utility model further includes a screen changer 2, a forming die 4 and a cooling air ring 3 which are sequentially arranged at the discharging end of the extruder 1. Raw materials such as polyethylene (LDPE), monoglyceride and butane are injected into the extruder 1. The servo controller 16 controls the rotation of the servo motor 10. The servo motor 10 drives the extrusion screw to rotate through the pulley 8 and a speed reducer 7. The pressure and rotational speed in the extrusion production process are both realized by vector closed-loop precision control through the servo controller 16 and the servo motor 10. The EPE is filtered by the screen changer 2 after extrusion, then extruded and formed through the forming die 4, passes through the cooling air ring 3, and then through traction and stretching to complete the production of the product.
[0017] The utility model is not limited to the above best implementation mode. Any other product identical or similar to the utility model obtained by anyone under the inspiration of the utility model falls within the protection scope of the utility model.
Claims
1. A servo motor vector closed-loop precision control device for pearl cotton (EPE) extrusion equipment, comprising an extruder (1), a reducer (7) and a pulley (8) arranged in sequence, the extruder (1) having an extrusion screw driven by the reducer (7) and the pulley (8), the extruder (1) being provided with a monoglyceride feed port (14), a butane feed port (15) and a pressure gauge (5), the monoglyceride feed port (14) and the butane feed port (15) being both provided with a one-way valve (11), characterized in that: The invention also comprises a servo motor (10) and a servo controller (16). The pulley (8) is controlled to move by the servo motor (10). The servo motor (10) and the servo controller (16) are connected via an encoder control line (12). A pressure sensor (6) is provided at the pressure gauge (5). The pressure sensor (6) is connected to the servo controller (16) via a pressure feedback line (9).
2. The servo motor vector closed-loop precision control device for pearl cotton (EPE) extrusion equipment according to claim 1 is characterized in that: It also includes a screen changer (2), a forming die (4) and a cooling air ring (3) which are sequentially arranged at the discharge end of the extruder (1).
3. The servo motor vector closed-loop precision control device for pearl cotton (EPE) extrusion equipment according to claim 1 is characterized in that: The servo controller (16) is connected to the control panel (13).