A polypropylene slitting device

Abstract

The utility model relates to the technical field of plastics processing discloses a polypropylene slitting device, include: bed, the bed top symmetry fixed has the vertical plate, the outside of vertical plate is provided with main control air cooling box, and the central controller of main control air cooling box top, the side of main control air cooling box is provided with the baffle, two between vertical plate set up the unwinding shaft, first transmission shaft, adjusting shaft, second transmission shaft, slitting main shaft, drive rod, the outside fixed mounting of adjusting shaft has the linkage piece. The utility model activates main control air cooling box work through the central controller, again through the effect that the pipe cooperates cold flow guide pipe, cooling air knife mouth, lastly forms low temperature gas curtain through cooling air knife mouth, and the low temperature high -speed gas curtain that cooling air knife mouth sprays blows to the cutting blade, and the cutting blade rotates and cuts when instantaneously drives friction heat, and the partial temperature of slitting cutting of processing production is lower than melting point, prevents polypropylene film slitting and melts and is drawn in silk.

Description

Technical Field

[0001] This utility model relates to the field of plastic processing technology, specifically to a polypropylene slitting device. Background Technology

[0002] Polypropylene film is widely used in many industries such as packaging, printing, textiles, and composite materials due to its excellent mechanical properties, chemical stability, and relatively low cost. In these applications, it is usually necessary to slit wide polypropylene master rolls into multiple narrow strips of specific widths according to downstream process requirements. This process is called slitting. The quality and efficiency of the slitting process directly affect the quality of the final product's edge trimming. However, although existing slitting equipment can complete the slitting process, it still has the following significant drawbacks: For example, unstable slitting quality can easily lead to molten filaments and rough edges. Because polypropylene has good toughness and a relatively low melting point, when the slitting blade is not sharp enough or the angle is incorrect, the friction between the blade and the material will generate local high temperatures, causing the polypropylene to melt and be drawn into filaments. These melts will not only contaminate the material surface and equipment, affecting the product appearance, but may also cause quality problems in downstream printing and laminating processes. Utility Model Content

[0003] This invention provides a polypropylene slitting device that uses blowing to cool the slitting blade, preventing filamentation or melting, and uses adsorption to remove debris, thereby improving processing quality.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: In a first aspect, a polypropylene slitting device includes: a base, vertical plates symmetrically fixed above the base, a main control air-cooling box and a central controller above the main control air-cooling box disposed on the outer side of the vertical plates, a baffle plate disposed on one side of the main control air-cooling box, an unwinding shaft, a first drive shaft, an adjusting shaft, a second drive shaft, a slitting main shaft, and a drive rod disposed between the two vertical plates, a linkage plate fixedly installed on the outer side of the adjusting shaft, an extrusion roller fixedly installed at one end of the linkage plate, and a plurality of cutting blades disposed on the outer side of the slitting main shaft, characterized in that it further includes: The cooling section is located inside the vertical plate to prevent wire drawing and melting; The cooling unit includes a slitting component, a cleaning component, and a heat dissipation component. The slitting component is located on the outside of the slitting spindle, the cleaning component is located on the outside of the cutting blade, and the slitting spindle is mounted on the shaft. All three are electrically connected to the central controller and work together to achieve cooling and chip removal functions.

[0005] Furthermore, the slitting component includes: A rotary chuck is located on one side of the slitting spindle; The cold flow conduit is located on the outside of the rotating chuck.

[0006] Furthermore, the slitting component also includes: The cooling air blades are located inside the cold flow duct; The connecting pipe has one end connected to the main control air-cooled box and the other end extending to the cold flow duct.

[0007] Furthermore, the cleaning component includes: The sensor base is fixed to the inside of the vertical plate by a bracket, and its internal signal receiving module is connected to the central controller. The negative pressure suction plate is located above the sensor base and outside the cutter blade. The fan power relay is controlled by the central controller.

[0008] Furthermore, the cleaning component also includes: The dust collection box is located above the sensor base and is connected to the air outlet of the negative pressure dust collection plate through a flexible pipe; The negative pressure dust suction plate has multiple slots on the side near the cutting blade to absorb external cutting debris; the negative pressure dust suction plate is connected to the output end of the centrifugal fan.

[0009] Furthermore, the heat sink includes: A dedicated liquid cooling tank, located on one side of the rotary chuck, is used to store coolant and is connected to the circulating pump; The semi-encircling cooling jacket is located inside the rotating chuck and has inlet and outlet ports.

[0010] Furthermore, the heat sink also includes: The liquid rotary joint is located inside the vertical plate and consists of a stationary outer shell and a rotating spindle. The stationary outer shell is provided with an inlet and an outlet. The rotating spindle rotates together with the cutting spindle and is provided with an interface for connecting to the semi-circular cooling jacket. The transmission pipeline is connected at one end to the outlet of the circulating pump in the liquid-cooled special box via a flange, and at the other end to the inlet of the stationary shell of the liquid-cooled rotary joint fixed on the bracket via a threaded joint.

[0011] Furthermore, the heat sink also includes: The safety interlock sensor is located on the connection surface between the rotary chuck and the cutting spindle, and is connected to the central controller; The radiator is installed throughout the interior of the liquid-cooled enclosure; The return pipe is connected at one end to the static water outlet of the liquid rotary joint via a stainless steel rigid pipe, and at the other end it passes through the side wall of the liquid-cooled tank.

[0012] The above-described solution of this utility model has at least the following beneficial effects: The main control air-cooled box is activated by the central controller. Then, through the connection pipes, the cold flow duct and the cooling air blades work together to form a low-temperature air curtain. The cooling air blades spray a uniform low-temperature high-speed air curtain onto the cutting blades. When the cutting blades rotate and cut, they instantly generate frictional heat, so that the local temperature of the slitting process is lower than the melting point, preventing the polypropylene film from melting and being pulled into fibers during slitting. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the overall three-dimensional structure provided for an embodiment of the present utility model; Figure 2 A three-dimensional structural diagram of the combination of the vertical plate, the drive rod, and the cutting spindle is provided for the embodiment of this utility model; Figure 3 An exploded three-dimensional view of the main control air-cooled box, the vertical plate, and the connecting pipe assembly is provided for the embodiments of this utility model; Figure 4 This is an exploded view of the structural combination of the slitting spindle and the rotary chuck provided in this embodiment of the utility model; Figure 5 This is provided by the embodiment of the present utility model. Figure 4 Enlarged schematic diagram of the local structure at point C; Figure 6 This is provided by the embodiment of the present utility model. Figure 4 Enlarged schematic diagram of the local structure at point D; Figure 7 This is a schematic diagram of the combination of a circulating pump and a rotary joint for liquid flow provided in an embodiment of the present invention.

[0015] In the diagram: 1. Base; 2. Vertical plate; 3. Main control air-cooled box; 4. Unwinding shaft; 5. Baffle plate; 6. First drive shaft; 7. Adjusting shaft; 8. Linkage plate; 9. Extrusion roller; 10. Second drive shaft; 11. Slitting main shaft; 12. Drive rod; 13. Central controller; 14. Through pipe; 15. Rotary chuck; 16. Cold flow pipe; 17. Liquid cooling box; 18. Cooling air blade; 19. Cutting blade; 20. Circulation pump; 21. Safety interlock sensor; 22. Induction base; 23. Dust collection box; 24. Negative pressure dust suction plate; 25. Transmission pipe; 26. Radiator; 27. Return pipe; 28. Liquid rotary joint. Detailed Implementation

[0016] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0017] like Figures 1 to 7 As shown, a polypropylene slitting device includes: a base 1, with vertical plates 2 symmetrically fixed above the base 1; a main control air-cooled box 3 and a central controller 13 above the main control air-cooled box 3 are arranged on the outer side of the vertical plates 2; a baffle 5 is arranged on one side of the main control air-cooled box 3; a winding shaft 4, a first drive shaft 6, an adjusting shaft 7, a second drive shaft 10, a slitting main shaft 11, and a drive rod 12 are arranged between the two vertical plates 2; a linkage plate 8 is fixedly installed on the outer side of the adjusting shaft 7; an extrusion roller 9 is fixedly installed at one end of the linkage plate 8; and multiple cutting blades 19 are arranged on the outer side of the slitting main shaft 11. The device also includes: The cooling section is located inside the vertical plate 2 to prevent melting and wire drawing; The cooling section includes a slitting component, a cleaning component, and a heat dissipation component. The slitting component is located on the outside of the slitting spindle 11, and the cleaning component is located on the outside of the cutting blade 19 and on the shaft of the slitting spindle 11. All three are electrically connected to the central controller 13 and work together to achieve the functions of cooling and chip removal.

[0018] Specifically, a servo motor is installed at one end of the first drive shaft 6 and connected to the output end of the servo motor; the baffle 5 is used to limit the unwinding shaft 4 to prevent excessive winding and unwinding, which would cause chaos; the main control air-cooled box 3 is equipped with a solenoid valve, which is controlled by the central controller 13 to control the flow rate of compressed gas entering the through pipe 14 to ensure the stability of the air curtain strength of the cooling air knife 18; the heat dissipation component includes a circulation pump, and the cleaning component includes a centrifugal fan; In practical application, the polypropylene film is first pulled out from the outside of the unwinding shaft 4, then wrapped around the first drive shaft 6, adjusting shaft 7, and second drive shaft 10, and finally wrapped around the outside of the drive rod 12 and secured with tape. The height of shaft 7 is then adjusted, and the extrusion roller 9 is placed on the outside of the second drive shaft 10 via the linkage plate 8 to stabilize the polypropylene film to be cut by the slitting spindle 11 and prevent deviation. Finally, the start button is pressed on the operation panel of the central controller 13. The central controller 13 will first check the status of the safety interlock sensor 21. After confirming the normal feedback spindle ready signal, the servo motor of the first drive shaft 6 is driven to work. The first drive shaft 6 is connected to the second drive shaft 10 and the slitting spindle 11 via belts. The slitting spindle 11 is then connected to the drive rod 12 via belts. The central controller 13 receives the ready signal from the safety interlock sensor 21, the speed signal from the motor encoder, and the instructions from the panel buttons. Based on this, it controls the solenoid valve of the main control air-cooled box 3, the circulation pump of the heat sink, and the centrifugal fan of the cleaning component, so that the cutting blade 19 rotates. The cutting of the polypropylene film is completed under the cutting of the cutting blade 19.

[0019] like Figures 1 to 4 As shown, the slitting component includes: A rotary chuck 15 is located on one side of the slitting spindle 11; The cold flow conduit 16 is located on the outside of the rotary chuck 15.

[0020] The cooling air blade 18 is located inside the cold flow duct 16.

[0021] Pipe 14 is connected at one end to the main control air-cooled box 3 and at the other end to the cold flow duct 16; Specifically, the central controller 13 is electrically connected to the slitting piece, receives pressure sensor signals, and controls the solenoid valve to operate; the inner hole of the rotary chuck 15 is provided with an involute spline groove, and the end of the spindle is equipped with matching spline teeth, which achieve circumferential synchronous rotation through the spline; a detachable end cover is installed on the outside of the rotary chuck 15, and the end cover is fixed to the rotary chuck 15 by bolts, forming an axial limit on the end of the spindle to prevent axial movement of the spindle; a pressure sensor is installed inside the cold flow duct 16 to monitor the gas pressure inside the cold flow duct 16; the air curtain direction of the cooling air blade 18 is set to blow downwards at a 30-degree angle with the plane of the cutting blade 19; the suction hole groove of the negative pressure dust suction plate 24 is located at the corresponding position below the cutting blade 19, so that the air curtain is naturally guided to the suction hole groove after the cutting blade 19, forming an interference-free relay airflow channel.

[0022] In practical application, the central controller 13 activates the main control air-cooled box 3 to spray out compressed gas, releasing the controlled compressed gas into the inside of the through pipe 14. After being transmitted through the through pipe 14, it enters the cold flow duct 16 and the inside of the cooling air blade 18. A low-temperature air curtain is formed through the cooling air blade 18. The cooling air blade 18 sprays a uniform low-temperature high-speed air curtain towards the cutting blade 19. When the cutting blade 19 rotates and cuts, it instantly generates frictional heat, so that the local temperature of the slitting and cutting process is lower than the melting point, preventing the polypropylene film from melting and being pulled into fibers during slitting.

[0023] like Figures 5 to 7 As shown, the cleaning component includes: The sensor base 22 is fixed to the inside of the vertical plate 2 by a bracket, and its internal signal receiving module is connected to the central controller 13. The negative pressure suction plate 24 is positioned above the induction base 22 and outside the cutter blade 19. The fan power relay is controlled by the central controller 13. A guide plate is provided at the inlet of the negative pressure suction plate 24 so that the cooling airflow naturally merges into the suction airflow after cooling, which avoids mutual interference and enhances the debris entrainment effect.

[0024] The dust collection box 23 is located above the sensor base 22 and is connected to the air outlet of the negative pressure dust collection plate 24 through a flexible pipe; The negative pressure dust suction plate 24 has multiple slots on the side near the cutting blade 19 to absorb external cutting debris; the negative pressure dust suction plate 24 is connected to the output end of the centrifugal fan; In practical application, the central controller 13 activates the centrifugal fan, and the negative pressure dust suction plate 24 is driven to begin extracting dust from the outside of the cutting blade 19. The dust enters the negative pressure dust suction plate 24 and then enters the dust collection box 23, completing the dust suction process. It should be noted that the motor encoder is existing technology and will not be described in detail. like Figure 5 , Figure 7 As shown, the heat sink includes: A liquid-cooled tank 17 is located on one side of the rotary chuck 15, used to store coolant, and connected to the circulating pump; A semi-circular cooling jacket 20 is located inside the rotary chuck 15 and has inlet and outlet ports. The liquid rotary joint 28 is located inside the vertical plate 2 and consists of a stationary outer shell and a rotating spindle. The stationary outer shell is provided with an inlet and an outlet. The rotating spindle rotates together with the slitting spindle 11 and is provided with an interface for connecting to the semi-circular cooling jacket 20. The stationary outer shell of the liquid rotary joint 28 is fixed to the vertical plate 2 by a special bracket to ensure that it does not rotate with the spindle. The rotating spindle of the liquid rotary joint 28 is rigidly connected to the interface of the semi-circular cooling jacket 20 by a coupling or thread and rotates synchronously with the slitting spindle 11. One end of the transmission pipe 25 is connected to the outlet of the circulating pump in the liquid-cooled special box 17 via a flange, and the other end is rigidly connected to the inlet of the stationary shell of the liquid rotary joint 28 fixed on the bracket via a threaded joint; the return pipe 27 is connected to the outlet of the stationary shell. Safety interlock sensor 21 is located on the inner side of the rotary chuck 15 and the connection surface with the cutting spindle 11, and is electrically connected to the central controller 13. It should be noted that the spindle ready signal sent by safety interlock sensor 21 and the initial state signal fed back by the motor encoder together constitute the core judgment basis for the central controller 13 to detect before startup. The controller must receive the spindle ready signal at the same time and confirm that the encoder status is normal before it can enter the equipment startup program and complete the closed loop of the pre-start detection. The radiator 26 is installed inside the liquid cooling box 17 to cool the high-temperature coolant after circulation through air cooling or water cooling, ensuring the efficiency of the semi-enclosed liquid cooling system. The return pipe 27 is connected at one end to the static water outlet of the liquid rotary joint 28 via a stainless steel rigid pipe, and at the other end it passes through the side wall of the liquid-cooled special box 17 and is connected to the inlet flange of the radiator 26. In practical application, after the slitting spindle 11 is installed, its left end is inserted into the rotary chuck 15 via a spline. The annular positioning groove at the end corresponds to the position of the elastic pin of the safety interlock sensor 21. Under the action of the spring force, the pin is inserted into the annular positioning groove, forcibly triggering the limit switch. This facilitates the safety interlock sensor 21 to send the spindle ready signal to the central controller 13 in a timely manner. During high-speed rotation, the pin will not detach from the positioning groove due to centrifugal force, thus preventing accidental triggering of the safety signal. The circulating pump of the liquid-cooled special box 17 pumps coolant through the transmission pipe 25 into the semi-enclosed cooling jacket 20 to absorb the heat of the slitting spindle 11. Finally, the coolant flows back to the radiator 26 to cool down, achieving active cooling of the entire blade body. The equipment can perform normal slitting operations. When the stop button is pressed or the motor speed drops below 10 r / min or a specific threshold, the central controller 13 triggers the shutdown program. The centrifugal fan, main control air-cooled box 3, and liquid-cooled special box 17 automatically shut down after a delay of about 30 seconds. This prevents melting and wire pulling due to cutting temperature, ensuring normal operation and preventing overheating.

[0025] Working principle: The device is based on a base 1, with symmetrically fixed vertical plates 2 on top. A main control air-cooled box 3 and a central controller 13 are located on the outer side. Key components such as the unwinding shaft 4, first drive shaft 6, adjusting shaft 7, second drive shaft 10, slitting main shaft 11, and drive rod 12 are mounted on the inner side. The adjusting shaft 7 is connected to the extrusion roller 9 via a linkage plate 8. The slitting main shaft 11 is equipped with cutting blades 19. A cooling section consisting of slitting components, cleaning components, and heat dissipation components is also included. All components are electrically connected to the central controller 13.

[0026] The polypropylene film is pulled out from the unwinding shaft 4, limited by the baffle 5 to prevent it from scattering, and sequentially passes around the first drive shaft 6, the adjusting shaft 7, and the second drive shaft 10, finally winding and fixing it onto the drive rod 12. The height of the adjusting shaft 7 is adjusted so that the extrusion roller 9 rests on the second drive shaft 10 via the linkage plate 8, stabilizing the film and preventing it from deviating.

[0027] After pressing the start button on the central controller 13, it first checks the status of the safety interlock sensor 21 on the connection surface between the rotary chuck 15 and the slitting spindle 11: the slitting spindle 11 is inserted into the rotary chuck 15 through a spline, and the end annular positioning groove cooperates with the elastic pin of the sensor 21 to trigger the ready signal. The central controller 13 needs to receive this signal and the motor encoder speed signal simultaneously, and start the equipment only after confirming that everything is normal.

[0028] The first drive shaft 6 is driven by a servo motor and is connected to the second drive shaft 10 and the slitting main shaft 11 via belts. The slitting main shaft 11 then drives the drive rod 12 to rotate synchronously via belts, causing the cutting blade 19 to rotate and achieve film slitting. The central controller 13 controls the solenoid valve in the main air-cooled box 3 to regulate the compressed gas to enter the cold flow duct 16 through the pipe 14. The pressure sensor in the cold flow duct 16 monitors the pressure. The gas finally forms a 30° downward low-temperature air curtain through the cooling air knife 18 and blows it toward the cutting blade 19 to reduce frictional heat and prevent the film from melting and drawing. The internal circulation pump of the liquid-cooled special box 17 sends the coolant through the transmission pipe 25 and the liquid rotary joint 28 into the semi-enclosed cooling jacket 20. After absorbing the heat of the split spindle 11, the coolant flows back to the radiator 26 through the return pipe 27 to cool down, thus achieving circulating cooling. The central controller 13 activates the centrifugal fan, and the negative pressure dust suction plate 24 below the cutting blade 19 adsorbs debris through the slots and sends it into the dust collection box 23 through the flexible pipe; its inlet guide plate guides the cooling airflow to converge, enhancing the dust removal effect. When the stop button is pressed or the motor speed is below 10 r / min, the central controller 13 triggers the shutdown procedure, and the centrifugal fan, main control air-cooled box 3, and liquid-cooled special box 17 are shut down after a 30-second delay, continuously cooling and cleaning the equipment until it is cooled down.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A polypropylene slitting device, comprising: A base (1) is provided, with vertical plates (2) symmetrically fixed above the base (1). A main control air-cooled box (3) and a central controller (13) above the main control air-cooled box (3) are provided on the outside of the vertical plates (2). A baffle (5) is provided on one side of the main control air-cooled box (3). A winding shaft (4), a first transmission shaft (6), an adjusting shaft (7), a second transmission shaft (10), a slitting main shaft (11), and a drive rod (12) are provided between the two vertical plates (2). A linkage plate (8) is fixedly installed on the outside of the adjusting shaft (7). A squeeze roller (9) is fixedly installed at one end of the linkage plate (8). Multiple cutting blades (19) are provided on the outside of the slitting main shaft (11). The machine is characterized by further comprising: The cooling section is located inside the vertical plate (2) to prevent wire drawing and melting; The cooling section includes a slitting component, a cleaning component, and a heat dissipation component. The slitting component is located outside the slitting spindle (11), and the cleaning component is located outside the cutting blade (19) and on the shaft of the slitting spindle (11). All three are electrically connected to the central controller (13) to work together to achieve cooling and chip removal functions.

2. The polypropylene slitting device according to claim 1, characterized in that: The slitting component includes: A rotary chuck (15) is located on one side of the slitting spindle (11); The cold flow conduit (16) is located on the outside of the rotary chuck (15).

3. A polypropylene slitting device according to claim 2, characterized in that: The slitting component also includes: Cooling air blades (18) are located inside the cold flow duct (16); The connecting pipe (14) is connected at one end to the main control air-cooled box (3) and at the other end to the cold flow duct (16).

4. A polypropylene slitting device according to claim 3, characterized in that: The cleaning component includes: The sensor base (22) is fixed to the inside of the vertical plate (2) by a bracket, and its internal signal receiving module is connected to the central controller (13); The negative pressure suction plate (24) is set above the induction base (22) and outside the cutter blade (19). The fan power relay is controlled by the central controller (13).

5. A polypropylene slitting device according to claim 4, characterized in that: The cleaning component also includes: The dust collection box (23) is set above the sensor base (22) and is connected to the air outlet of the negative pressure dust collection plate (24) through a flexible pipe; The negative pressure dust suction plate (24) has multiple holes and slots on the side near the cutting blade (19) to absorb external cutting debris; the negative pressure dust suction plate (24) is connected to the output end of the centrifugal fan.

6. A polypropylene slitting device according to claim 5, characterized in that: The heat sink includes: A liquid-cooled tank (17) is located on one side of the rotary chuck (15) for storing coolant and is connected to the circulating pump; A semi-circular cooling jacket (20) is located inside the rotating chuck (15) and has inlet and outlet ports.

7. A polypropylene slitting device according to claim 6, characterized in that: The heat sink also includes: The liquid rotary joint (28) is set inside the vertical plate (2) and consists of a stationary shell and a rotating spindle. The stationary shell is provided with an inlet and an outlet. The rotating spindle rotates together with the cutting spindle (11) and is provided with an interface for connecting to the semi-circular cooling jacket (20). The transmission pipe (25) is connected at one end to the outlet of the circulating pump in the liquid-cooled special box (17) via a flange, and at the other end to the inlet of the stationary shell of the liquid rotary joint (28) fixed on the bracket via a threaded joint.

8. A polypropylene slitting device according to claim 7, characterized in that: The heat sink also includes: The safety interlock sensor (21) is located on the inner side of the rotary chuck (15) and the connection surface with the cutting spindle (11), and is electrically connected to the central controller (13); The radiator (26) is installed inside the liquid-cooled dedicated box (17); The return pipe (27) is connected at one end to the static water outlet of the liquid rotary joint (28) via a stainless steel rigid pipe, and at the other end it passes through the side wall of the liquid-cooled special box (17).

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