CN210103061U

CN210103061U - PTFE blank film tension balancing device extruded by flat die

Info

Publication number: CN210103061U
Application number: CN201920355764.0U
Authority: CN
Inventors: 李敖琪; 成卓宇
Original assignee: Ningbo Changqi Fluorine Plastic Products Co ltd
Current assignee: Ningbo Changqi Fluorine Plastic Products Co ltd
Priority date: 2019-03-20
Filing date: 2019-03-20
Publication date: 2020-02-21
Anticipated expiration: 2029-03-20

Abstract

PTFE base film tension weighing and fixing device is extruded to flat mouthful of mould, and the base film is extruded by the extruder, and the base film passes through draw gear and pulls the entrance that reachs the calender, draw gear include two carry over pinch rolls, the base film is from passing through between two carry over pinch rolls, utilize two carry over pinch roll surface friction to pull, the carry over pinch roll be connected with the buncher of control carry over pinch roll rotation speed, one side of draw gear still be provided with and be used for detecting the tensile tension detection mechanism of base film, tension detection mechanism pass through PLC control module and link to each other with buncher, the rotation speed of control carry over pinch roll. The utility model discloses following beneficial effect has: the automatic tension control device has the advantages of automatic adjustment, good consistency of tension control during rolling, good consistency of the extruded rolled film, and little difference of width, thickness, fiber strength and structure.

Description

PTFE blank film tension balancing device extruded by flat die

Technical Field

The utility model belongs to calendering membrane base film transmission device field, concretely relates to flat mouthful of mould is extruded PTFE base film tension weighing apparatus and is decided device.

Background

In products such as sealing materials, filter materials, composite materials and the like mainly composed of a rolled film of a PTFE material, the die for extruding the raw film is mainly composed of two types, namely a round die and a flat die. The advantages of the flat die are obvious compared with the round die.

The rolled film obtained after rolling the blank film extruded by the flat die has the following advantages: 1) the width of the rolled film is wider, and the uniformity of the width is better; 2) the precision of the thickness of the rolled film can be obviously improved; 3) the strength uniformity in the longitudinal direction and the transverse direction is obviously improved, but the adopted process technology has high requirements, and if no corresponding process, technology and equipment exists, a blank film extruded by a flat die cannot be rolled into an ideal rolled film.

Because of this, in the PTFE sealing material industry in China at present, hundreds of processing enterprises adopt the rod-shaped blank extruded by the round-mouth die to manufacture the rolled film, and because of this, the PTFE sealing material (commonly called raw material tape) manufactured by these enterprises mostly stays at the middle and low grade level of the market, and even the raw material tape cannot enter high grade fields such as the insulation field of semiconductor, military electricity, and electric appliance cable wrapping.

As can be seen in fig. 1, the blanks entering the extruder are not continuous and are manufactured individually, comprising a blank 11, a barrel 12, a blank press 13, the blank press 1 pressing the blank 11 downwards in the barrel 12, each blank weighing 0.5-20 kg.

In order to ensure the quality of the rolled film, the corresponding process technology is adopted to control the extruded blank film. So that the blank film can not generate transverse buckling and can not be deformed due to accumulation and extrusion in the transition stage before the extruded film enters a calender,

the tension of the blank film is maintained at 0.1-1.5kg/100mm²According to the soft state of the extruded blank film, the sectional area of the die is related to the linearity and the flatness of the extruded blank film, the tension is determined according to the sectional area of the blank film, the blank film is only required to be flat when being rolled, the rolled belt is normal, and the blank film basically has no transverse movement phenomenon when being rolled; the blank 11 is pressed into the blank by the press, the density of each section of blank is uneven, each uneven blank film is drawn by a drawing device and enters a calender, the rotating speed of the calender is constant, the blank film with high density needs to be pressedThe extension time is long, the length of the rolled finished product is also long, so that the blank film before a rolling machine and a traction mechanism is accumulated, the accumulated blank film enters the rolling machine to generate transverse wrinkles, and waste finished products appear at the back.

Disclosure of Invention

To the deficiency among the prior art, the utility model provides a PTFE base film tension weighing apparatus and control method are extruded to flat mouthful of mould solves current base film calendering in-process, and each base film density is inhomogeneous, if do not adjust drive mechanism's speed, presses the finished product belt width error after the delay and increases, and thickness is uneven, and calendering membrane fibre is pressed phenomena such as disconnected, the problem that the belt disability rate is high.

The utility model discloses a following technical scheme realizes.

PTFE base film tension weighing and fixing device is extruded to flat mouthful of mould, and the base film is extruded by the extruder, and the base film passes through draw gear and pulls the entrance that reachs the calender, draw gear include two carry over pinch rolls, the base film is from passing through between two carry over pinch rolls, utilize two carry over pinch roll surface friction to pull, the carry over pinch roll be connected with the buncher of control carry over pinch roll rotation speed, one side of draw gear still be provided with and be used for detecting the tensile tension detection mechanism of base film, tension detection mechanism pass through PLC control module and link to each other with buncher, the rotation speed of control carry over pinch roll. The tension detection mechanism detects the tension change of the blank film to complete the change of the speed regulating motor, and the linkage effect of the tension detection mechanism and the speed regulating motor is very ingenious.

Preferably, the rotating shaft of the speed regulating motor is connected with the traction roller through a belt pulley.

Preferably, the tension detection mechanism comprises a guide roller, the guide roller is positioned right below the blank film and automatically rotates along with the transmission of the blank film, a tension sensor is arranged below the guide roller, and the tension sensor is connected with the PLC control module.

Preferably, the tension sensor comprises a sensor A and a sensor B, the sensor A is arranged at one end of the guide roller, and the sensor B is arranged at the other end of the guide roller.

Preferably, bearing mounting seats are arranged at two ends of the guide roller, and the sensor A and the sensor B are positioned below the bearing mounting seats.

Preferably, the tension detection mechanism comprises a floating shaft, the floating shaft is positioned right above the blank film, one end of the floating shaft is provided with a rectangular plate which moves up and down along with the floating shaft, the other side of the floating shaft is provided with a fixed mounting plate, and two ends of the fixed mounting plate are provided with photoelectric sensors.

Preferably, the two ends of the floating shaft are provided with installation sliding blocks, one side of each sliding block is provided with a guide rail, and each sliding block is clamped in each guide rail and slides up and down in each guide rail.

Compared with the prior art: the automatic tension control device has the advantages of automatic adjustment, good consistency of tension control during rolling, good consistency of the extruded rolled film, and little difference of width, thickness, fiber strength and structure.

Drawings

Fig. 1 is a schematic structural diagram of the blank forming machine of the present invention.

Fig. 2 is a top view of the traction device and calender positions of the present invention. .

Fig. 3 is a schematic structural view of the traction device of the present invention.

Fig. 4 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 5 is a schematic structural view of the guide roller of the present invention.

Fig. 6 is a schematic structural view of embodiment 2 of the present invention.

Fig. 7 is a side view of the floating axle of the present invention.

Detailed Description

The flat mouth die extrudes a PTFE blank film tension balancing device, a blank film is extruded by an extruder, the blank film is pulled to an inlet of a calender 94 by a pulling device, the pulling device comprises two pulling rollers 50, the blank film passes between the two pulling rollers 50 and is pulled by using the surface friction force of two pulling rollers 8, the pulling rollers 50 are connected with a speed regulating motor 40 for controlling the rotating speed of the pulling rollers 50, one side of the pulling device is also provided with a tension detection mechanism for detecting the tension of the blank film, the tension detection mechanism is connected with the speed regulating motor 40 by a PLC (programmable logic controller) control module 30 for controlling the rotating speed of the pulling rollers 50, the rotating shaft of the speed regulating motor 40 is connected with the pulling rollers 50 by a belt pulley, the tension detection mechanism comprises a guide roller 10, the guide roller 10 is positioned under the blank film and automatically rotates along with the transmission of the blank film, a tension sensor 20 is arranged below the guide roller 10, the tension sensor 20 is connected with a PLC (programmable logic controller) control module 30, the tension sensor 20 comprises a sensor A201 and a sensor B202, the sensor A201 is arranged at one end of the guide roller 10, the sensor B202 is arranged at the other end of the guide roller 10, bearing mounting seats are arranged at two ends of the guide roller 10, the sensor A201 and the sensor B202 are arranged below the bearing mounting seats, the tension detection mechanism comprises a floating shaft 70, the floating shaft 70 is arranged right above a blank film, a rectangular plate 60 which moves up and down along with the floating shaft 70 is arranged at one end of the floating shaft 70, a fixed mounting plate is arranged at the other side of the floating shaft 70, photoelectric sensors 80 are arranged at two ends of the fixed mounting plate, and mounting sliders are arranged at two ends of the floating shaft 70, one side of the said slide block has guide rails, the slide block is blocked in the guide rail, and it slides up and down in the guide rail, the sensor A201 is placed at one end of the guide roller 10, the sensor B202 is placed at the other end of the guide roller 10, it sets a total bearing force, the total bearing force is the sum of the initial bearing forces of the two sensors, when the pulling device pulls the blank film, the change of the blank film tension will generate different pressure to the guide roller 10, when the pressure induced by the two sensors is the same as the total bearing force, the PLC control module 30 controls the speed of the adjustable speed motor 40 to keep at the original level, the total bearing force is less than the set value, the PLC control module 30 controls the speed adjustable motor 40 to decelerate, the total bearing force is greater than the set value, the PLC control module 30 controls the speed adjustable speed motor 40 to accelerate, the floating roller 70 is placed on the blank film, the weight of the floating roller 70 is set as the standard tension value, at, when the tension of the blank film is in the changing process, an upward force is generated on the floating roller 70, when the floating roller 70 is driven by the blank film to move upwards, the floating roller is detected by the photoelectric sensor 80 at the upper end of the fixed mounting plate, at the moment, the photoelectric sensor 80 detects and transmits a signal to the PLC control module 30, and the PLC control module 30 immediately instructs the motor to instruct the speed regulating motor 40 to increase the speed according to the frequency and the amplitude programmed by the software; when the floating roll 70 is driven by the blank film to move downwards, the lower end of the rectangular plate 60 is detected by the photoelectric sensor 80 at the lower end of the fixed mounting plate, the PLC control module 30 immediately instructs the speed regulating motor 40 to decelerate, and when the two photoelectric sensors 80 do not sense, the speed of the speed regulating motor 40 is unchanged.

In the using process, the density of the blank film generated by each blank is inconsistent, the blank film is drawn by the blank film clamped by two drawing rollers 50 in the drawing device, the drawing rollers 50 can adopt metal materials or non-metal materials, but no matter what materials are adopted, the surface of the blank film has certain roughness and high precision, the drawing is carried out by surface friction force, and the diameter of the drawing rollers 50 is determined by the surface friction coefficient of the materials used by the drawing rollers.

In embodiment 1, the initial position of the guide roll 10 is slightly higher than the traction roll 50, in order to match with a calender, the traction speed needs to be adjusted, the rotation speed of the calender is constant, the blank film with high density needs long calendering time, and the length of the finished product part calendered out is also long, so that the blank film before the calender and the traction mechanism is accumulated, at this time, the tension of the blank film is very small, the force induced by the tension sensor 20 below the guide roll 10 is small, the total bearing force is smaller than a set value, the PLC control module 30 controls the speed regulating motor 40 to decelerate, so that the accumulated blank film is eliminated by the calender; if the blank film is low in density, the required rolling time is short, the blank film is insufficient, the tension is large, the force induced by the tension sensor 20 below the guide roll 10 is large, the total bearing force is larger than a set value, the PLC control module 30 controls the speed regulating motor 40 to accelerate, and the blank film is supplied as soon as possible; the total bearing force is equal to the set value, and the speed of the speed regulating motor 40 does not need to be changed.

In embodiment 2, the initial position of the floating roll 70 is slightly lower than the pulling roll 50, the floating roll 70 is placed on the blank film, the weight of the floating roll 70 is set to be a standard tension value, the blank film with high density is long, the required rolling time is long, and the length of the rolled finished product is also long, so that the blank film before the rolling mill and the pulling mechanism is accumulated, the tension of the blank film is small, when the tension is small, the lower end of the rectangular plate 60 is detected by the photoelectric sensor 80 fixed at the lower end of the mounting plate when the floating roll 70 is driven by the blank film to move downwards, and the PLC control module 30 immediately instructs the speed regulating motor 40 to decelerate; if the blank film is low in density, the required rolling time is short, the blank film is insufficient at the moment, the tension is large, an upward force is generated on the floating roller 70, when the floating roller 70 is driven by the blank film to move upwards, the floating roller is detected by the photoelectric sensor 80 at the upper end of the fixed mounting plate, the probe of the photoelectric sensor 80 transmits a signal to the PLC control module 30, the PLC control module 30 immediately instructs the motor to instruct the speed-up of the speed-regulating motor 40 according to the frequency and amplitude programmed by software, and the blank film is quickly supplemented; when the force applied to the floating roller 70 is a standard tension value, the speed regulating motor 40 does not need to regulate the speed.

The protection scope of the present invention includes but is not limited to the above embodiments, the protection scope of the present invention is subject to the claims, and any replacement, deformation, and improvement that can be easily conceived by those skilled in the art made by the present technology all fall into the protection scope of the present invention.

Claims

1. Flat mouthful of mould extrusion PTFE base film tension balance decides device, and the base film is extruded by the extruder, its characterized in that, the base film passes through draw gear and pulls the entrance that reachs calender (94), draw gear include two carry over pinch rolls (50), the base film passes through between two carry over pinch rolls (50), utilizes two carry over pinch roll surface friction to pull, carry over pinch roll (50) be connected with buncher (40) of control carry over pinch roll (50) rotation speed, one side of draw gear still be provided with and be used for detecting the tensile tension detection mechanism of base film, tension detection mechanism pass through PLC control module (30) and link to each other with buncher (40), the rotation speed of control carry over pinch roll (50).

2. The tension balancer for PTFE blank film extruded from flat die as claimed in claim 1, wherein the shaft of the speed-adjustable motor (40) is connected to the pulling roller (50) via a pulley.

3. The tension balance device for the flat-die extruded PTFE blank film according to claim 1, wherein the tension detection mechanism comprises a guide roller (10), the guide roller (10) is positioned right below the blank film and automatically rotates along with the transmission of the blank film, a tension sensor (20) is arranged below the guide roller (10), and the tension sensor (20) is connected with a PLC (programmable logic controller) module (30).

4. The flat die extruded PTFE blank film tension balancing apparatus of claim 3, wherein said tension sensor (20) comprises a sensor A (201) and a sensor B (202), said sensor A (201) is disposed at one end of the guide roll (10), and said sensor B (202) is disposed at the other end of the guide roll (10).

5. The tension balancer for extruded PTFE blank film with flat die as claimed in claim 4, wherein the guide roll (10) has bearing mounts at both ends, and the sensor A (201) and the sensor B (202) are located below the bearing mounts.

6. The tension balance device for the flat-die extruded PTFE blank film according to claim 1, wherein the tension detection mechanism comprises a floating shaft (70), the floating shaft (70) is positioned right above the blank film, one end of the floating shaft (70) is provided with a rectangular plate (60) which moves up and down along with the floating shaft (70), the other side of the floating shaft (70) is provided with a fixed mounting plate, and two ends of the fixed mounting plate are provided with photoelectric sensors (80).

7. The tension balance device for the flat-die extruded PTFE blank film according to claim 6, wherein the two ends of the floating shaft (70) are provided with mounting sliding blocks, one side of each sliding block is provided with a guide rail, and each sliding block is clamped in the guide rail and slides up and down in the guide rail.