Mixing device for filling PTFE material

Abstract

The utility model relates to the technical field of high polymer material mixing, in particular to a material mixing device for filling PTFE (Polytetrafluoroethylene) materials. The device comprises a feeding assembly used for conveying PTFE materials and mixed materials, a mixing assembly connected to the discharging end of the feeding assembly and used for receiving the PTFE materials and the mixed materials conveyed by the feeding assembly and conducting high-temperature and high-pressure mixing refining, and a granulation assembly connected to the discharging end of the mixing assembly and used for conducting granulation on the PTFE materials and the mixed materials conveyed by the mixing assembly. And the granulating assembly is used for receiving and granulating the PTFE material and the mixture mixed by the mixing assembly. Through cooperation of the feeding assembly and the mixing assembly, a PTFE material and a mixture can be fully mixed under the conditions of high temperature and high pressure, homogenization of the material is ensured, the physical and chemical properties of the material can be effectively improved through the mixing mode, the high-standard industrial application requirement is met, the device adopts a continuous working process, and the production efficiency is improved. Automatic operation from feeding, mixing to granulation is achieved, manual intervention is reduced, and production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of high polymer material mixing especially relates to a filling PTFE material is with mixing device. BACKGROUND

[0002] PTFE (polytetrafluoroethylene) material because of its excellent chemical stability, high and low temperature resistance, low friction coefficient etc, in many fields get wide application, in practical application, in order to further improve the performance of PTFE material, often need to add various filling materials to it, such as glass fiber, carbon fiber, graphite etc., mixing device as the key equipment of realizing PTFE material and filling material uniform mixing, its performance is good or bad directly influences the quality of final product.

[0003] The existing filling PTFE material is with mixing device, adopts the mode of mechanical stirring to carry out mixing, and common mixing equipment includes double screw extruder, high-speed mixer etc., and the double screw extruder is rotated in the cylinder by two intermeshing screws, forwards to deliver and mixes simultaneously to material, and the high-speed mixer is to utilize the stirring paddle of high-speed rotation, and material is mixed mutually under the strong stirring action, these equipment can realize the mixing of material to a certain extent, but still exposes some problems in actual operation process.

[0004] In the mechanical stirring process, due to the flowability, density difference etc. of material, local mixing uneven phenomenon is easy to appear, for example, for some filling materials of greater density, in the mixing process, it can sink, leading to the concentration of filling material at the bottom to be too high, and the concentration of upper portion is lower, thereby making the performance of final product fluctuate, when mixing PTFE material and filling material, the ratio of the two needs to be strictly controlled to ensure that product performance meets the requirements, however, the existing mixing device is relatively cumbersome in ratio operation, and usually needs artificial to pre-weigh a certain amount of PTFE material and filling material, then is added to mixing equipment, and this artificial weighing mode is not only inefficient, but also is easy to appear error, leading to inaccurate ratio. INVENTION CONTENTS

[0005] In order to solve the sufficient mixing of PTFE material and filling material, improve the accuracy and efficiency of ratio, the utility model provides a filling PTFE material is with mixing device.

[0006] The utility model provides a filling PTFE material is with mixing device adopts following technical scheme:

[0007] A kind of filling PTFE material is with mixing device, comprising:

[0008] Feeding assembly is used to transport PTFE material and mixture;

[0009] A mixing assembly is connected at the discharge end of the feeding assembly for receiving the PTFE material and the mixture delivered by the feeding assembly and mixing them at high temperature and high pressure;

[0010] A granulating assembly is connected at the discharge end of the mixing assembly for receiving the PTFE material and the mixture after mixing by the mixing assembly and granulating them.

[0011] Through the cooperation of the feeding assembly and the mixing assembly, the PTFE material and the mixture can be fully mixed under high temperature and high pressure conditions, ensuring the homogenization of the material. This mixing method can effectively improve the physical and chemical properties of the material, meet the high-standard industrial application requirements, and realize automatic operation from feeding, mixing to granulation, reducing manual intervention, improving production efficiency, and reducing errors caused by human operation. The granulating assembly can quickly form the mixed material into uniform particles, and the particle size and shape are controllable, which is convenient for subsequent processing and use. This stable granulation quality helps to improve the consistency and reliability of the product.

[0012] Further, the feeding assembly is a box-type container, and a feeding port is formed at the top and a discharge port is formed at the bottom. The feeding port at the top of the feeding assembly is connected with a conveying pipe, the conveying pipe is connected with a raw material supply device, and the discharge port at the bottom of the feeding assembly is provided with a feeding valve.

[0013] The design of the box-type container provides a large storage space, which can accommodate more PTFE material and mixture, reduces the frequency of feeding, and improves the efficiency of feeding. The feeding valve at the discharge port can accurately control the discharge speed and flow, making the work of the downstream mixing assembly more stable, which is beneficial to the uniformity and quality control of the mixture.

[0014] Further, a weighing device is installed on the feeding valve.

[0015] The weighing device can monitor the weight of the material passing through the feeding valve in real time, realizing accurate measurement. This accurate control helps to ensure the accurate proportion of the raw materials received by the downstream mixing assembly, improving the uniformity and stability of the mixture. The weighing device is linked with an automatic control system, which can automatically adjust the opening and closing of the feeding valve and the discharge amount according to the preset formula and parameters, realizing efficient automatic production and reducing human intervention and operation errors.

[0016] Further, the feeding assembly and the mixing assembly are connected through a premixing assembly, which is used to receive the feeding from the feeding assembly and preliminarily stir and mix the PTFE material and the mixture.

[0017] The premixing assembly can receive the materials from the feeding assembly, and can preliminarily mix the PTFE material and the mixed materials, so that the raw materials have a certain uniformity before entering the mixing assembly, which helps to improve the quality and consistency of the final mixture. During the conveying process, the premixing assembly can prevent the separation of different materials due to the density difference, ensure the uniformity of the mixed materials, and avoid product quality problems.

[0018] Further, the premixing assembly is a barrel-shaped container, the premixing assembly is internally provided with stirring blades, the premixing assembly is externally wrapped with a heat preservation package, the top of the premixing assembly is connected with the feeding assembly, and the bottom of the premixing assembly is provided with a discharge port and a discharge valve.

[0019] The combination of the barrel-shaped structure and the internal stirring blades can effectively stir and mix the materials in the container, improve the mixing efficiency and uniformity, and ensure that the PTFE material and other mixed materials are fully mixed. The design of the external heat preservation package helps to maintain the required temperature environment during the mixing process and avoid heat loss. The bottom discharge port and the discharge valve allow precise discharge control of the mixed materials.

[0020] Further, the mixing assembly is a sealed tank structure, the mixing assembly is internally provided with a mixing auger, the mixing assembly is provided with a heating resistance wire on the side wall, the heating resistance wire is externally connected with a power supply, and the mixing assembly is externally connected with a high-pressure gas filling device through a pressurized air inlet pipe.

[0021] The sealed tank structure ensures that the mixing process is carried out in a closed environment, avoids the entry of external impurities, and maintains the purity of the mixed materials. The internal mixing auger can fully mix the materials and enhance the mixing effect, so as to ensure the uniformity of the PTFE material and other mixed materials. The heating resistance wire is powered by an external power supply, which can provide stable heat during the mixing process, so that the temperature in the tank body is maintained within the required range. The high-pressure gas filling device connected through the pressurized air inlet pipe can apply high-pressure gas to the mixing tank. The pressurized environment helps to improve the mixing efficiency, promote the interaction between the materials, and enhance the mixing effect. The high-pressure environment can also improve the rate and effect of certain specific reactions.

[0022] Further, the granulating assembly comprises an extrusion pipe, the extrusion pipe is in a cylindrical strip shape, and the cross section is set according to the granulating size and shape. The cross section includes a rectangle, a trapezoid, a triangle, and a special shape. The extrusion pipe is movably provided with a cutting knife at the end.

[0023] The cross-sectional shape of the extrusion pipe can be flexibly designed according to the requirements of products, the size and shape of each particle can be accurately controlled, different production requirements and specification requirements of final products can be met, the movable cutting knife at the end of the extrusion pipe can accurately cut the extruded particles according to the production requirements, and the size of each particle can be ensured to be uniform by adjusting the cutting speed and angle of the cutting knife, and the cutting process is stable and smooth.

[0024] Further, the cooling heat exchange pipe is provided on the pipe wall of the extrusion pipe, and the cooling heat exchange pipe is connected with a heat exchange refrigeration device.

[0025] The cooling heat exchange pipe can help rapid solidification and molding during the extrusion process by timely reducing the material temperature, prevent the particles from deforming or sticking together at high temperature, so as to ensure that the shape and surface quality of the particles meet the expected requirements, and the rapid cooling of the extruded material can effectively reduce the deformation and defects of the particles caused by high flowability during the molding process, such as warping, sinking and the like, and improve the qualified rate of finished products.

[0026] Further, the feeding assembly, the mixing assembly and the granulating assembly are electrically connected with a control assembly, the control assembly comprises a monitoring sensor and a control computer, and the monitoring sensor is connected with the control computer through communication.

[0027] The monitoring sensor can detect various key parameters in the feeding, mixing and granulating processes in real time, such as temperature, pressure, flow, material state and the like, and transmit data to the control computer through communication connection, the control computer can analyze these data in real time, provide instant feedback, help the operator to timely adjust the process parameters, and ensure that the whole production process is stable and accurate.

[0028] Further, the control assembly further comprises a power supply switching switch, and the power supply switching switch is connected with a main power supply and a backup power supply device respectively.

[0029] The power supply switching switch can automatically or manually switch to the backup power supply device when the main power supply fails or power is interrupted, so as to ensure continuous power supply of the production line, thereby avoiding production interruption and equipment damage caused by sudden power failure.

[0030] In summary, the utility model has the following beneficial technical effects:

[0031] 1. The design can adapt to the properties and supply modes of different materials, and only needs to replace or adjust the parameters of the conveying pipe and the valve, so that different production requirements can be met, and the design has high adaptability and flexibility.

[0032] 2. The design of installing a weighing device on the feeding valve has significant advantages in improving feeding accuracy, realizing automatic control, optimizing production process, and enhancing product quality, providing reliable guarantee for large-scale industrial production.

[0033] 3. The premixing assembly has significant advantages in improving mixing uniformity, increasing mixing efficiency, optimizing production process, and reducing equipment wear, providing effective technical support for producing high-quality mixtures.

[0034] 4. This design has significant advantages in improving mixing efficiency, ensuring temperature stability, optimizing material conveying and discharging, and simplifying operation and maintenance, providing reliable technical support for efficient and stable production.

[0035] 5. The combination of the sealed tank structure, internal mixing auger, heating resistance wire, and high-pressure gas filling equipment of the mixing assembly has significant advantages in improving mixing efficiency, ensuring temperature and pressure stability, reducing pollution, improving safety and production efficiency, etc.

[0036] 6. The combination of the diversified cross-sectional design of the extrusion pipe and the movable cutting knife has significant advantages in improving particle accuracy, production efficiency, material utilization rate, and process flexibility.

[0037] 7. The cooling heat exchange pipe installed on the extrusion pipe and the external heat exchange refrigeration equipment have significant advantages in improving particle quality, reducing equipment wear, improving production efficiency and safety, etc. through efficient temperature control and management, providing important technical support for efficient, stable, and energy-saving particle production.

[0038] 8. Through the integration of monitoring sensors and control computers, the entire production process not only realizes high automation, but also improves production accuracy, efficiency, and safety. Real-time data monitoring and intelligent adjustment make the production process more stable and controllable, while reducing failure rate and resource waste, greatly improving overall production efficiency and product quality.

[0039] 9. Through the design of the power switching switch, the control assembly can not only improve the power supply reliability and safety of the production line, but also ensure continuous production in the case of power interruption, protect equipment and product quality, and improve the flexibility and adaptability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 is a schematic diagram of the external structure of the utility model;

[0041] Figure 2 is a schematic diagram of the internal structure of the utility model at the center plane;

[0042] Figure 3The utility model discloses control assembly connection schematic drawing.

[0043] Mark explanation:

[0044] 1, feeding assembly, 11, conveying pipe, 12, weigher, 13, feeding valve, 2, premixing assembly, 21, stirring blade, 22, heat preservation package, 23, discharge valve, 3, mixing assembly, 31, heating resistance wire, 32, pressurized air inlet pipe, 33, mixing auger, 4, granulating assembly, 41, cooling heat exchange pipe, 42, extruding pipe, 43, cutting knife, 5, control assembly, 51, monitoring sensor, 52, power supply change-over switch, 53, control computer. Specific implementation

[0045] The following will be combined with the attached Figures 1-3 The technical scheme in the embodiments of the utility model is clearly and completely described, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments, all other embodiments obtained by the person skilled in the art without making creative labor based on the embodiments in the utility model belong to the scope of the utility model protection.

[0046] In the description of the utility model, it is understood that the orientation or position relation indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relation shown in the drawing, and is only for the convenience of describing the utility model, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it can not be understood as the limitation of the utility model.

[0047] Embodiment 1:

[0048] The utility model embodiment discloses a kind of mixing device for filling PTFE material, refer to Figure 1 And Figure 2 , comprising:

[0049] Feeding assembly 1 is used to transport PTFE material and mixed material;

[0050] Mixing assembly 3, the mixing assembly 3 is connected in the discharging end of feeding assembly 1, for receiving the PTFE material and mixed material transported by feeding assembly 1 and carrying out high-temperature high-pressure mixing;

[0051] Granulating assembly 4, the granulating assembly 4 is connected in the discharging end of mixing assembly 3, for receiving the PTFE material and mixed material after mixing of mixing assembly 3 and carrying out granulation.

[0052] First, confirm the ratio of PTFE material and mixture, ensure that it meets the process requirements, prepare these raw materials and put them into the storage bin of the feeding assembly, start the feeding assembly 1, make it start conveying materials at the set rate, the feeding system may include a screw conveyor, a vibrating feeder or a pneumatic conveying system, depending on the design requirements, monitor the feeding amount in real time through the sensor, ensure stable material conveying, if there is material blockage or poor conveying, it needs to be adjusted in time.

[0053] Check the temperature, pressure and heating equipment status of the mixing assembly 3, ensure that the equipment can provide the required high temperature and high pressure environment, usually the temperature is controlled between 200-300°C, the pressure is determined according to different production processes, the material is conveyed to the inlet end of the mixing assembly 3 through the feeding assembly 1, starts to enter the mixing cavity, starts the mixing assembly 3, the mixing device will mix the material through the rotating action, during the mixing process, the additives and plastic components in the material will undergo chemical reaction and physical crosslinking under high temperature and high pressure, forming a uniform mixture, real-time monitoring of temperature, pressure and stirring rate during mixing process through sensors, the control computer will adjust the mixing time, heating temperature and stirring speed according to these data to ensure that the mixing effect reaches the predetermined standard, after mixing is completed, the mixing effect is confirmed by observing the liquidity, viscosity and other indicators of the mixture, if it meets the requirements, the mixed material will enter the granulation assembly.

[0054] Check the working status of the granulation assembly 4, including temperature, cooling system operation and whether the nozzle and mold of the granulator are clean and intact, start the granulation system, during this process, the mixed material is heated by high temperature and extruded by the extrusion equipment, then cut by the mold to form particles, according to the size and shape of the required particles, the control computer will automatically adjust the temperature, pressure and granulation rate of the granulator, if necessary, the length of the cut particles or the cooling rate of the particles can be adjusted to ensure the uniformity and quality of the particles, after the material is extruded through the mold, it will enter the cooling system for rapid cooling to ensure that the particles are formed and have appropriate hardness and stability, through the monitoring sensor, monitor the material flow, particle size and uniformity data during the granulation process to ensure that the particles meet the quality standards, finally collect and store the particles.

[0055] Example 2:

[0056] Based on Example 1:

[0057] Reference Figure 1 and Figure 2The feeding assembly 1 is a box-shaped container, and a feeding port is formed at the top and a discharging port is formed at the bottom. The feeding port at the top of the feeding assembly 1 is connected with a conveying pipe 11, and the conveying pipe 11 is connected with a raw material supply device. The discharging port at the bottom of the feeding assembly 1 is provided with a feeding valve 13.

[0058] With reference to Figure 1 and Figure 2 , the feeding valve 13 is provided with a weighing device 12.

[0059] The closed design can effectively prevent dust from overflowing, reduce pollution to the operating environment, protect the health of workers, and reduce material waste.

[0060] In some production processes that require strict formulations, the use of a weighing device can ensure that the addition amount of each raw material is accurate, thereby improving the quality and consistency of the final product and meeting high-standard production requirements.

[0061] The use of a weighing device can record and save the raw material addition data of each batch of production, facilitate quality traceability and management, and improve the overall production management level.

[0062] Embodiment 3:

[0063] Based on embodiment 1:

[0064] With reference to Figure 1 and Figure 2 , the feeding assembly 1 and the mixing assembly 3 are connected through a premixing assembly 2. The premixing assembly 2 is used to receive the feed from the feeding assembly 1 and to preliminarily stir and mix the PTFE material and the mixed material.

[0065] With reference to Figure 1 and Figure 2 , the premixing assembly 2 is a barrel-shaped container. The premixing assembly 2 is internally provided with stirring blade paddles 21. The premixing assembly 2 is externally wrapped with a heat preservation wrapping 22. The premixing assembly 2 is connected with the feeding assembly 1 at the top. The premixing assembly 2 is provided with a discharge valve 23 at the discharging port.

[0066] Dividing the mixing process into two stages of premixing and main mixing can allow more accurate control and adjustment at each stage, thereby improving the flexibility and control accuracy of the entire mixing process.

[0067] Since the raw materials have been preliminarily mixed before entering the mixing assembly, the severe stirring in the mixing assembly is reduced, which can reduce the wear of the equipment, prolong the service life of the equipment, and reduce the maintenance cost.

[0068] Embodiment 4:

[0069] Based on embodiment 1:

[0070] Referring to Figure 1 and Figure 2 , the mixing assembly 3 is a sealed tank structure, a mixing auger 33 is rotatably installed inside the mixing assembly 3, heating resistance wires 31 are arranged on the side wall of the mixing assembly 3, the heating resistance wires 31 are connected to a power supply, and the mixing assembly 3 is connected to a high-pressure gas filling device through a pressurized gas inlet pipe 32.

[0071] The design of the barrel-shaped container generally facilitates cleaning and maintenance, reduces the time and cost of equipment maintenance, and ensures the continuity of the production process and the long-term stable operation of the equipment.

[0072] Through the speed and direction control of the stirring blade paddle, the operating parameters during the mixing process can be flexibly adjusted to meet the needs of different production processes, improving the flexibility of the production process.

[0073] Example 5:

[0074] Based on Example 1:

[0075] Referring to Figure 1 and Figure 2 , the granulating assembly 4 includes an extrusion pipe 42, which is a cylindrical structure and has a cross-section according to the granulating size and shape, including rectangular, trapezoidal, triangular, and irregular shapes, and a cutting knife 43 is movably installed at the end of the extrusion pipe 42.

[0076] Referring to Figure 1 and Figure 2 , cooling heat exchange pipes 41 are arranged on the pipe wall of the extrusion pipe 42, and the cooling heat exchange pipes 41 are connected to a heat exchange refrigeration device.

[0077] The combination of the sealed tank structure and the high-pressure gas filling device can fill inert gas into the tank to prevent the material from contacting with oxygen in the air during the mixing process, reduce oxidation and other pollution, and ensure the quality and stability of the mixed material.

[0078] This design can optimize the process flow of granule production, so that various parameters during the granulating process, such as particle shape, size, and cutting frequency, can be flexibly adjusted to meet different product specification requirements, improving the adaptability of the production process.

[0079] Different materials have different requirements for temperature during extrusion granulation, and the flexible adjustment function of the cooling heat exchange pipe and the heat exchange refrigeration device can set the temperature according to the characteristics of different materials, ensuring that each material can be extruded and formed within the optimal temperature range, improving the adaptability of the equipment and the diversity of production.

[0080] Example 6:

[0081] Based on the embodiment 1:

[0082] With reference to Figure 3 The feeding assembly 1, the mixing assembly 3 and the granulating assembly 4 are electrically connected with a control assembly 5, the control assembly 5 comprises a monitoring sensor 51 and a control computer 53, and the monitoring sensor 51 is communicatively connected with the control computer 53.

[0083] With reference to Figure 3 The control assembly 5 further comprises a power supply switch 52, and the power supply switch 52 is respectively connected with a main power supply and a backup power supply device.

[0084] The monitoring sensor can monitor key safety parameters in the production environment at any time, such as temperature and pressure, and when an abnormality occurs, the control computer can timely issue an alarm to remind the operator to take necessary safety precautions, thereby reducing the safety risks caused by equipment failure or abnormal operation.

[0085] The control computer can save all data in the production process, including various parameters monitored by the sensor and the corresponding control adjustment history, and these data can not only help to optimize the production process, but also can perform traceability analysis when a quality problem occurs, quickly find out the root cause of the problem, and ensure product quality and safety.

[0086] The above is only an example and description of the structure of the utility model, and those skilled in the art can make various modifications or supplements or use similar ways to replace the described specific embodiments, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the present claims, which shall belong to the protection scope of the utility model.

Claims

1. A mixing device for filling a PTFE material, characterized by comprising: The utility model relates to a PTFE material mixing and granulating device, which comprises the following components: a feeding assembly (1) for conveying PTFE material and mixed materials; a mixing assembly (3) connected at the discharging end of the feeding assembly (1) for receiving the PTFE material and mixed materials conveyed by the feeding assembly (1) and mixing them at high temperature and high pressure; a granulating assembly (4) connected at the discharging end of the mixing assembly (3) for receiving the PTFE material and mixed materials mixed by the mixing assembly (3) and granulating them.

2. The mixing device for filling PTFE material according to claim 1, wherein: The feeding assembly (1) is a box-shaped container, and a feeding port is formed at the top of the feeding assembly (1), and a discharging port is formed at the bottom of the feeding assembly (1). A conveying pipe (11) is connected to the feeding port at the top of the feeding assembly (1), and the conveying pipe (11) is connected to a raw material supply device. A feeding valve (13) is arranged at the discharging port at the bottom of the feeding assembly (1).

3. The mixing device for filling PTFE material according to claim 2, wherein: A weighing device (12) is mounted on the feeding valve (13).

4. The mixing device for filling PTFE material according to claim 1, wherein: The feeding assembly (1) and the mixing assembly (3) are connected to each other through a premixing assembly (2), and the premixing assembly (2) is used for receiving the materials fed from the feeding assembly (1) and preliminarily stirring and mixing the PTFE material and mixed materials.

5. The mixing device for filling PTFE material according to claim 4, wherein: The premixing assembly (2) is a barrel-shaped container, and stirring blades (21) are mounted in the premixing assembly (2). The premixing assembly (2) is wrapped with a heat preservation wrapping (22). The premixing assembly (2) is connected to the feeding assembly (1) at the top of the premixing assembly (2). A discharging port is formed at the bottom of the premixing assembly (2), and a discharge valve (23) is arranged at the discharging port.

6. The mixing device for filling PTFE material according to claim 1, wherein: The mixing assembly (3) is a sealed tank structure, and a mixing auger (33) is rotatably mounted in the mixing assembly (3). Heating resistance wires (31) are arranged on the side wall of the mixing assembly (3), and the heating resistance wires (31) are connected to a power supply. The mixing assembly (3) is connected to a high-pressure gas filling device through a pressurized air inlet pipe (32).

7. The mixing device for filling PTFE material according to claim 1, wherein: The granulating assembly (4) comprises an extrusion pipe (42), which is in a cylindrical strip structure and has a cross section in the shape of a rectangle, a trapezoid, a triangle or a special shape according to the size and shape of the granules. A cutting knife (43) is movably mounted at the end of the extrusion pipe (42).

8. The mixing device for filling PTFE material according to claim 7, wherein: Cooling heat exchange pipes (41) are arranged on the pipe wall of the extrusion pipe (42), and the cooling heat exchange pipes (41) are connected to a heat exchange refrigeration device.

9. The mixing device for filling PTFE material according to claim 1, wherein: The feeding assembly (1), the mixing assembly (3) and the granulating assembly (4) are electrically connected to a control assembly (5), which comprises monitoring sensors (51) and a control computer (53). The monitoring sensors (51) are connected to the control computer (53) through communication.

10. The compounding device for filling PTFE material according to claim 9, characterized in that: The control assembly (5) further comprises a power supply switching switch (52) for controlling the main power supply and a standby power supply device.

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