阅读说明：本技术 一种大口径四氟管生产工艺 (Production process of large-diameter tetrafluoro pipe ) 是由 姚袁生 仇桂芹 韦存花 柏立楼 张福高 于 2019-09-06 设计创作，主要内容包括：本发明公开了一种大口径四氟管生产工艺,包括以下步骤：(1)加热设备；(2)清洗并检查设备；(3)启动挤出机；(4)冷却水箱冷却水的开启；(5)真空定径：真空度的大小直接影响到管材的外径尺寸,真空度控制在0.07-0.10MPa,一般情况下生产四氟管外径尺寸越大,要求的真空度就越高；(6)冷却定型：水温控制在15-25℃为宜,并对出真空槽后的四氟管进行冷却定型；(7)管材切割。本发明对生产装置各段加热,再经过设备检查、启动挤出机、采用牵引管直接与坯料对接、真空定径、提高真空度、冷却定型管材切割,能够实现生产大口径的四氟管,且成品质量好。(The invention discloses a production process of a large-caliber tetrafluoride pipe, which comprises the following steps: (1) a heating device; (2) cleaning and inspecting the equipment; (3) starting the extruder; (4) opening cooling water of a cooling water tank; (5) vacuum sizing: the vacuum degree directly influences the outer diameter of the pipe, the vacuum degree is controlled to be 0.07-0.10MPa, and generally, the larger the outer diameter of the produced tetrafluoro pipe is, the higher the required vacuum degree is; (6) cooling and shaping: controlling the water temperature to be between 15 and 25 ℃, and cooling and shaping the tetrafluoro pipe after the tetrafluoro pipe is discharged out of the vacuum tank; (7) and (5) cutting the pipe. The production device heats all sections of the production device, and the finished product quality is good by checking the equipment, starting the extruder, directly butting the traction pipe with the blank, sizing in vacuum, improving the vacuum degree, cooling and shaping the pipe and cutting the pipe.)

1. A production process of a large-diameter tetrafluoro pipe is characterized by comprising the following steps: the method comprises the following steps:

(1) Heating equipment: when each section is heated, the heating is carried out in stages, namely, each section is heated to 120 ℃ firstly, the temperature is kept constant for 30min, then the temperature is heated to 160 ℃, and the temperature is kept constant for 15 min;

(2) cleaning and inspecting the apparatus: after the temperature of each section reaches the process temperature, keeping the temperature for at least 30min, continuously extruding for 15min after the discharge of the material at the die, exhausting gas, and stopping extrusion; then, the equipment is checked again, and the organization condition of the personnel is checked, so that various preparation works are carried out;

(3) starting the extruder: the method comprises the steps that firstly, a color line co-extruder is started to extrude for 15-30min at the speed of 20 revolutions, then extrusion can be started at the basic speed of 5-10 revolutions, the rotating speed of the co-extruder is reduced to the process speed, a discharged material blank is observed, the heating condition is confirmed, the material blank has no bubbles, whether the material blank is smooth and flat or not is judged, the process temperature is reasonably adjusted according to the observation condition, a starting joint can be manufactured after the material blank meets the requirement, the starting joint of the large-caliber tetrafluoro tube is preferably directly butted with a material blank by adopting a traction tube, and the generation of a large number of special-shaped;

(4) Opening cooling water of a cooling water tank: the cooling water is started in time after the joints enter the sizing sleeve, and the joints are started again after the last traction joint exits from the cooling water tank, so that the cooling water is prevented from entering the tetrafluoro pipe, the quality of the tetrafluoro pipe is prevented from being influenced, and even the temperature of a die head is influenced, and the starting failure is prevented;

(5) vacuum sizing: the vacuum degree directly influences the outer diameter of the pipe, the vacuum degree is controlled to be 0.07-0.10MPa, the larger the outer diameter of the produced tetrafluoro pipe is, the higher the required vacuum degree is, the outer diameter of the tetrafluoro pipe behind a vacuum tank is measured in time, the vacuum degree is adjusted after reasonable judgment, and relevant data are recorded so as to adjust in time and avoid the generation of large-batch waste products;

(6) cooling and shaping: controlling the water temperature to be between 15 and 25 ℃, and cooling and shaping the tetrafluoro pipe after the tetrafluoro pipe is discharged out of the vacuum tank;

(7) cutting the pipe: during cutting, a specially-assigned person is required to observe the cutting condition, the size data of the tetrafluoro tube after cutting and after complete cooling shrinkage are measured and recorded in time, and the data correspond to various data in the process, are sorted and summarized, and are completely stored.

2. The production process of the large-caliber tetrafluoride tube according to claim 1, wherein in the step (3), lubricating oil is coated on the mandrel during startup to prevent the blank from being bonded on the mandrel to cause quality defects of the inner wall; the main machine is started at the main machine speed of 5-10 revolutions, when the discharged blank meets the requirement of a joint, the main machine is stopped, the blank is compacted from the outside to the inside toward the core rod, the traction tube is poured to the tube opening to insert the blank in time at a slower speed, the main machine is started first after cooling for 2-3 minutes, then traction is started, and the machine is started according to the extrusion molding procedure.

3. the process for producing the large-diameter polytetrafluoroethylene tube according to claim 1, wherein the non-circularity of the tube is observed during production, the qualified tube is taken out of the vacuum tank and then clamped in time, the non-circularity of the tube is measured in time, and the non-circularity of the tube is adjusted in time to ensure the quality of the tube.

4. The process according to claim 1, wherein in the step (6), the flow rate of the cooling water is monitored and controlled by a flow meter.

5. The process for producing the large-diameter polytetrafluoroethylene tube according to claim 1, wherein in the step (7), when the tube is cut, a clamping cutter and a jacking cutter are required to be processed in time, so that the phenomenon that the tail is not adjusted and the production line is stopped is avoided.

Technical Field

The invention relates to the technical field of production of a tetrafluoro pipe, in particular to a production process of a tetrafluoro pipe with a large caliber.

Background

the polytetrafluoroethylene tube (F4 tube and tetrafluoride tube for short) is a high-quality plunger-type extruded tube, and adopts special processing technique to tightly combine the steel tube and the plastic tube, and can bear positive pressure of 1.6Mpa and negative pressure of 77 Kpa; can be normally used within-60 ℃ to +260 ℃, and has reliable and excellent corrosion resistance. The conveying pipe can convey strong corrosive gas and liquid at high temperature, which cannot be replaced by other pipelines. The method is widely applied to the fields of machinery, chemical engineering, aviation, electrical and electronic, national defense industry, advanced science and technology, medical treatment and health, electrical insulation and the like.

the average diameter of the existing tetrafluoro pipe is less than 450mm, and the tetrafluoro pipe with larger diameter is difficult to produce, so that a production process of the tetrafluoro pipe with large diameter of 450 plus 500mm is urgently needed.

Disclosure of Invention

Therefore, it is necessary to provide a process for producing a large-diameter tetrafluoro pipe, so as to solve the above problems.

A production process of a large-caliber tetrafluoride pipe comprises the following steps:

(1) Heating equipment: when each section is heated, the heating is carried out in stages, namely, each section is heated to 120 ℃ firstly, the temperature is kept constant for 30min, then the temperature is heated to 160 ℃, and the temperature is kept constant for 15 min;

(2) cleaning and inspecting the apparatus: after the temperature of each section reaches the process temperature, keeping the temperature for at least 30min, continuously extruding for 15min after the discharge of the material at the die, exhausting gas, and stopping extrusion; then, the equipment is checked again, and the organization condition of the personnel is checked, so that various preparation works are carried out;

(3) starting the extruder: the method comprises the steps that firstly, a color line co-extruder is started to extrude for 15-30min at the speed of 20 revolutions, then extrusion can be started at the basic speed of 5-10 revolutions, the rotating speed of the co-extruder is reduced to the process speed, a discharged material blank is observed, the heating condition is confirmed, the material blank has no bubbles, whether the material blank is smooth and flat or not is judged, the process temperature is reasonably adjusted according to the observation condition, a starting joint can be manufactured after the material blank meets the requirement, the starting joint of the large-caliber tetrafluoro tube is preferably directly butted with a material blank by adopting a traction tube, and the generation of a large number of special-shaped;

(4) Opening cooling water of a cooling water tank: the cooling water is started in time after the joints enter the sizing sleeve, and the joints are started again after the last traction joint exits from the cooling water tank, so that the cooling water is prevented from entering the tetrafluoro pipe, the quality of the tetrafluoro pipe is prevented from being influenced, and even the temperature of a die head is influenced, and the starting failure is prevented;

(5) vacuum sizing: the vacuum degree directly influences the outer diameter of the pipe, the vacuum degree is controlled to be 0.07-0.10MPa, the larger the outer diameter of the produced tetrafluoro pipe is, the higher the required vacuum degree is, the outer diameter of the tetrafluoro pipe behind a vacuum tank is measured in time, the vacuum degree is adjusted after reasonable judgment, and relevant data are recorded so as to adjust in time and avoid the generation of large-batch waste products;

(6) Cooling and shaping: controlling the water temperature to be between 15 and 25 ℃, and cooling and shaping the tetrafluoro pipe after the tetrafluoro pipe is discharged out of the vacuum tank;

(7) Cutting the pipe: during cutting, a specially-assigned person is required to observe the cutting condition, the size data of the tetrafluoro tube after cutting and after complete cooling shrinkage are measured and recorded in time, and the data correspond to various data in the process, are sorted and summarized, and are completely stored.

preferably, in the step (3), when the machine is started, firstly, lubricating oil is coated on the mandrel, so that the quality defect of the inner wall caused by the fact that the blank is adhered to the mandrel is prevented; the main machine is started at the main machine speed of 5-10 revolutions, when the discharged blank meets the requirement of a joint, the main machine is stopped, the blank is compacted from the outside to the inside toward the core rod, the traction tube is poured to the tube opening to insert the blank in time at a slower speed, the main machine is started first after cooling for 2-3 minutes, then traction is started, and the machine is started according to the extrusion molding procedure.

Preferably, during production, the out-of-roundness of the pipe needs to be observed, the qualified pipe is clamped in time after being discharged from the vacuum tank, the out-of-roundness of the pipe is measured in time, and the pipe is adjusted in time to ensure the quality of the pipe.

preferably, in step (6), the flow rate of the cooling water is monitored and controlled by a flow meter.

preferably, in the step (7), when the pipe is cut, the clamping knife and the jacking knife need to be processed in time, so that the phenomenon that the tail is not adjusted and the line is stopped is avoided.

The invention has the beneficial effects that: heating each section of the production device, checking the equipment, starting the extruder, directly butting the traction pipe with the blank, carrying out vacuum sizing, improving the vacuum degree, cooling and shaping the pipe, and cutting the pipe, so that the production of the large-diameter tetrafluoro pipe can be realized, and the quality of the finished product is good.

Detailed Description

The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.

A production process of a large-caliber tetrafluoride pipe comprises the following steps:

(1) Heating equipment: when each section is heated, the heating is carried out in stages, namely, each section is heated to 120 ℃ firstly, the temperature is kept constant for 30min, then the temperature is heated to 160 ℃, and the temperature is kept constant for 15 min;

(2) Cleaning and inspecting the apparatus: after the temperature of each section reaches the process temperature, keeping the temperature for at least 30min, continuously extruding for 15min after the discharge of the material at the die, exhausting gas, and stopping extrusion; then, the equipment is subjected to secondary inspection, and the organization condition of personnel is inspected, so that various preparation works are carried out;

(3) Starting the extruder: the method comprises the steps that firstly, a color line co-extruder is started to extrude for 15-30min at the speed of 20 revolutions, then extrusion can be started at the basic speed of 5-10 revolutions, the rotating speed of the co-extruder is reduced to the process speed, a discharged material blank is observed, the heating condition is confirmed, the material blank has no bubbles, whether the material blank is smooth and flat or not is judged, the process temperature is reasonably adjusted according to the observation condition, a starting joint can be manufactured after the material blank meets the requirement, the starting joint of the large-caliber tetrafluoro tube is preferably directly butted with a material blank by adopting a traction tube, and the generation of a large number of special-shaped; when the machine is started, firstly, lubricating oil is coated on the core rod, so that the quality defect of the inner wall caused by the fact that the blank is adhered to the core rod is prevented; the main machine is started at the main machine speed of 5-10 revolutions, when the discharged blank meets the requirement of a joint, the main machine is stopped, the blank is compacted from the outside to the inside toward the core rod, the traction tube is poured to the tube opening to insert the blank in time at a slower speed, the main machine is started first after cooling for 2-3 minutes, then traction is started, and the machine is started according to the extrusion molding procedure.

(4) Opening cooling water of a cooling water tank: and the cooling water is started in time after the joint enters the sizing sleeve, and the cooling water must be started after the last traction joint is discharged from the cooling water tank, so that the condition that the cooling water enters the pipe, the quality of the pipe is influenced, and even the temperature of the die head is influenced, and the starting failure is caused is avoided.

(5) Vacuum sizing: the size of the vacuum degree directly influences the outer diameter size of the pipe, the vacuum degree is generally controlled to be 0.07-0.10MPa, and the vacuum degree is as low as possible on the premise of meeting the appearance quality of the pipe, so that the internal stress of the pipe is small, and the deformation of a product in the storage process is small;

Under general conditions, the larger the outer diameter of a produced pipe is, the higher the required vacuum degree is, the outer diameter of the pipe behind a vacuum groove is measured in time, the vacuum degree is adjusted after reasonable judgment, and relevant data are recorded so as to facilitate timely adjustment and avoid generation of large-batch waste products.

during production, the out-of-roundness of the pipe needs to be observed, the qualified pipe is clamped in time after being discharged from a vacuum tank, the out-of-roundness of the pipe is measured in time, the pipe is adjusted in time, the quality of the pipe is ensured, although the out-of-roundness is not forcibly required in the national standard delivery inspection project, in the using process, more and more attention is paid, more and more quality complaints are caused, and therefore the out-of-roundness index needs to be paid attention.

(6) Cooling and shaping: the water temperature is controlled to be between 15 and 25 ℃, the cooling water temperature is too high, the cooling time can be prolonged, the cooling speed is reduced, the time that the molten raw material is at a high temperature is prolonged, particularly the inner wall of the pipe, the decomposition of additives such as antioxidant in the raw material can be accelerated, the anti-aging performance of the pipe is reduced, the shaping of the pipe is also adversely affected, and on the contrary, if the cooling water temperature is too low, the cooling crystallization speed of the outer surface of the molten polytetrafluoroethylene pipe is too high, the temperature difference between the inner surface and the outer surface of the pipe is too large, so that the large internal stress is generated after the pipe is shaped, and the mechanical and physical properties of the pipe. The cooling water flow is too large, so that the surface of the pipe is rough, and spots and pits are generated; too small a size will cause the surface quality of the pipe to be poor, so as to cause shift points, and the uneven distribution of cooling water will cause the pipe to be out of round

(7) cutting the pipe: when the pipe is cut, a specially-assigned person is required to observe the cutting condition, the size data of the pipe after cutting and after complete cooling shrinkage is measured and recorded in time, and the size data corresponds to various data in the process, and the data are sorted, summarized and completely stored.

it is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.