CN111660526A

CN111660526A - Polyether-ether-ketone pipe production equipment and manufacturing method

Info

Publication number: CN111660526A
Application number: CN201910170685.7A
Authority: CN
Inventors: 郝斌; 江厚建; 黄锡成
Original assignee: Shenzhen Enxinlong Special Material Ltd By Share Ltd
Current assignee: Shenzhen Enxinlong Special Material Ltd By Share Ltd
Priority date: 2019-03-07
Filing date: 2019-03-07
Publication date: 2020-09-15

Abstract

The invention provides a production device of a polyether-ether-ketone pipe and a manufacturing method thereof, wherein the production device comprises a plasticizing extrusion system, a transmission system, a forming system and a control system; the molding system comprises a pipe mold and a cooling device; the pipe mould comprises a main mould, a core mould and a forming pipe mould, and the forming pipe mould is used for forming the outer wall of the polyether-ether-ketone pipe along the advancing direction of materials; the core die is used for molding the inner wall of the polyether-ether-ketone pipe; the cooling device comprises a first cooling element and a second cooling element, wherein the first cooling element is used for cooling the formed pipe die, and the second cooling element is used for cooling the core die so as to keep the temperature of the core die at 210-230 ℃.

Description

Polyether-ether-ketone pipe production equipment and manufacturing method

Technical Field

The invention relates to the field of engineering plastics, in particular to polyether-ether-ketone pipe production equipment and a manufacturing method.

Background

Polyetheretherketone (PEEK) is an aromatic crystalline thermoplastic polymer composed of repeating units of polyaryletherketone. The polyetheretherketone has a melting point of 334 ℃, a glass transition Temperature (TG) of 143 ℃, a maximum crystallinity which can be achieved of 48%, typically 20-30%, and a density in the amorphous state of 1.265g/cm³And a density at the maximum crystallinity of 1.32g/cm³. The polyether-ether-ketone resin is a special engineering plastic with excellent performance, has more remarkable advantages compared with other special engineering plastics, has high temperature resistance, excellent mechanical property, excellent chemical corrosion resistance, good self-lubricating property, excellent peeling resistance, excellent wear resistance and excellent flame retardance, simultaneously has the characteristic of radiation resistance, and can be used in the scientific and technological fields of high-end machinery, engineering, aviation and the like.

The existing polyetheretherketone pipe is manufactured by adopting an extrusion molding process, materials are added into an extruder, the materials are conveyed forwards and compacted under the extrusion pushing action of the rotation of a screw rod through the friction action of the inner wall of a machine barrel and the surface of the screw rod, the materials are melted and plasticized under the conditions of high temperature and high pressure through a heating device and friction preheating outside the machine barrel, then the melted materials are pushed into a machine head die by a continuously rotating screw rod, and the melted materials extruded from the machine head die are cooled and shaped to form the required polyetheretherketone product.

However, in the existing production technology, the polyether-ether-ketone pipe is easy to have the problems of defective finished product surface, uneven wall thickness, unsmooth performance, even cracking and the like.

Disclosure of Invention

In view of the above, it is necessary to provide a production apparatus and a manufacturing method for polyetheretherketone pipes, which are directed to the problems that the production of polyetheretherketone pipes is prone to occur.

The invention provides polyether-ether-ketone pipe production equipment which comprises a plasticizing extrusion system, a transmission system, a forming system and a control system, wherein the plasticizing extrusion system is connected with the transmission system through a pipeline;

the molding system comprises a pipe mold and a cooling device;

the pipe mold comprises a main mold, a core mold and a forming pipe mold, the main mold is arranged at the front ends of the core mold and the forming pipe mold along the advancing direction of materials, the forming pipe mold is sleeved outside the core mold, and the main mold is used for enabling the materials extruded from the plasticizing extrusion system to change from spiral flow into linear flow to enter between the core mold and the forming pipe mold; the forming pipe die is used for forming the outer wall of the polyether-ether-ketone pipe; the core mold is sleeved in the forming pipe mold and used for forming the inner wall of the polyether-ether-ketone pipe;

the cooling device comprises a first cooling element and a second cooling element, wherein the first cooling element is used for cooling the formed pipe die, and the second cooling element is used for cooling the core die so as to keep the temperature of the core die at 210-230 ℃.

In one embodiment, the first cooling element and the second cooling element are used to maintain the same temperature of the formed tube mold and the core mold.

In one embodiment, the core mold has a hollow inner cavity, and the second cooling element comprises a second cooling circulation line, and the hollow inner cavity is communicated with the second cooling circulation line and used for circulating a cooling medium through the hollow inner cavity to cool the core mold.

In one embodiment, a partition is disposed in the hollow interior cavity of the core mold, and the partition separates a closed cavity in the hollow interior cavity of the core mold away from the main mold for containing the cooling medium.

In one embodiment, the length of the closed cavity accounts for 2/3-4/5 of the length of the core die.

In one embodiment, the length of the core mold is l, the inner diameter of the forming pipe mold is R, and the outer diameter of the core mold is R, l (R-R)/2, which is 10: 1-3: 4.

In one embodiment, the length of the forming pipe die is L, the inner diameter of the forming pipe die is R, and the outer diameter of the core die is R, wherein the ratio of R to R/2 is 20: 1-3: 4.

In one embodiment, the main mold comprises an outer mold sleeve and a spreader cone sleeved inside the outer mold sleeve, a channel for the material to flow is formed between the outer mold sleeve and the spreader cone, so that the material enters a space between the core mold and the forming pipe mold from the plasticizing extrusion system, and the taper of the spreader cone is 50-55 degrees.

In one embodiment, the plasticizing extrusion system is sequentially divided into a feeding area, a melting area, a homogenizing area and a joint area along the advancing direction of materials, and the heating temperature of the feeding area is 390-400 ℃; the heating temperature of the melting zone is 395-400 ℃; the heating temperature of the homogenizing zone is 395-400 ℃; the heating temperature of the joint area is 395-400 ℃.

In one embodiment, the main die is sequentially divided into a first temperature area, a second temperature area and a third temperature area along the advancing direction of the material, wherein the temperature of the first temperature area is 380-390 ℃, and the temperature of the second temperature area is 380-390 ℃; the temperature of the third temperature zone is 360-370 ℃.

In one embodiment, the rotation speed of a screw in the plasticizing extrusion system is 18 r/min-30 r/min.

In one embodiment, the transmission system comprises a traction device, the traction device is arranged behind the forming die in the material advancing direction and is used for providing traction power and traction speed to pull the polyether-ether-ketone pipe out of the forming system, and the traction speed of the traction device is 5 r/min-12 r/min.

The invention also provides a manufacturing method of the polyether-ether-ketone pipe production equipment, which comprises the following steps:

plasticizing a material by heating of the plasticizing extrusion system and extruding the plasticized material into the molding system; and

and the plasticized material enters the core mold and the forming pipe mold through the main mold for forming, and the outer wall and the inner wall of the formed pipe are simultaneously cooled and shaped through the cooling device.

In one embodiment, the outer wall and the inner wall of the formed pipe are cooled and shaped at the same speed by controlling the temperature of the first cooling element and the second cooling element.

The invention provides polyether-ether-ketone pipe production equipment which comprises a molding system, wherein the molding system comprises a pipe mold and a cooling device. The pipe mold comprises a main mold, a core mold and a forming pipe mold. The core mold is used for molding the inner wall of the polyether-ether-ketone pipe, the molding pipe mold is used for molding the outer wall of the polyether-ether-ketone pipe, and the cooling device is used for cooling the molding pipe mold and the core mold and keeping the temperature of the core mold at 210-230 ℃. Under the mutual cooperation of the forming pipe die, the core die and the cooling device, when the polyether-ether-ketone material is formed into a pipe, the forming pipe die and the core die can both cool the material between the forming pipe die and the core die, so that the uniformity of the temperature inside and outside the pipe is improved, the problems of defects, uneven wall thickness, unsmooth surface and even cracking of the surface of the finished product polyether-ether-ketone pipe, especially the inner wall, and the like are effectively solved, the generation efficiency is improved, and the yield of the produced polyether-ether-ketone pipe is greatly improved.

Drawings

FIG. 1 is a schematic structural diagram of a PEEK pipe production apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a pipe mold and a cooling device according to an embodiment of the present invention;

fig. 3 is a schematic view of a core mold structure according to an embodiment of the present invention.

10-a motor;

20-a reduction gearbox;

30-a hopper;

40-a dryer;

50-a control system;

60-screw rod;

70-flange joint;

80-material nozzle;

100-pipe mould;

120-a main mold;

122-outer die sleeve; 124-a splitter cone;

140-core mold;

142-a hollow lumen; 144-a separator; 146-a closed chamber;

160-forming a tube mold;

162-a cooling jacket;

200-a cooling device;

210-a first cooling circulation line; 230-second cooling circulation line.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by the following embodiments, which are taken in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, an embodiment of the present invention provides a peek tubing production apparatus, including a plasticizing extrusion system, a transmission system, a molding system, and a control system.

The plasticizing extrusion system comprises a material barrel and a screw 60 arranged in the material barrel, and is used for plasticizing materials and extruding the plasticized materials into a molding system through the screw 60.

The molding system includes a tube mold 100 and a cooling device 200.

The pipe mold 100 includes a main mold 120, a core mold 140, and a forming pipe mold 160. In the material advancing direction, the main mold 120 is disposed at the front ends of the core mold 140 and the forming pipe mold 160, and the forming pipe mold 160 is fitted over the core mold 140. The main die 120 serves to change the flow of the material extruded from the plasticizing extrusion system from a spiral flow to a straight flow into between the core die 140 and the molding tube die 160. The forming pipe die 160 is used for forming the outer wall of the polyetheretherketone pipe. The core mold 140 is sleeved inside the forming pipe mold 160 and used for forming the inner wall of the polyetheretherketone pipe. The screw 60 is rotated to move the material in a forward direction from one end of the barrel to the other.

The cooling device 200 includes a first cooling element for cooling down the molded pipe die 160 and a second cooling element for cooling down the core die 140 so as to maintain the temperature of the core die 140 at 210 c to 230 c.

The production equipment of the polyether-ether-ketone pipe provided by the embodiment of the invention comprises a forming system, wherein the forming system comprises a pipe mold and a cooling device, the pipe mold comprises a main mold, a core mold and a forming pipe mold, the core mold is used for forming the inner wall of the polyether-ether-ketone pipe, the forming pipe mold is used for forming the outer wall of the polyether-ether-ketone pipe, and the cooling device is used for cooling the forming pipe mold and the core mold and keeping the temperature of the core mold at 210-230 ℃. Under the mutual cooperation of the forming pipe die, the core die and the cooling device, when the polyether-ether-ketone material is formed into a pipe, the forming pipe die and the core die can both cool the material between the forming pipe die and the core die, so that the uniformity of the temperature inside and outside the pipe is improved, the problems of the surface of the finished product polyether-ether-ketone pipe, particularly the defects of the inner wall, uneven wall thickness, unsmooth surface, even cracking and the like are effectively solved, the generation efficiency is improved, and the yield of the produced polyether-ether-ketone pipe is greatly improved.

The peek tubing manufacturing apparatus further includes a heating device (not shown in the figures) for heating the plasticizing extrusion system and the main mold 120. The heating device can respectively perform segmented heating on different positions of the plasticizing extrusion system and the main die 120, so that the plasticizing extrusion system and the main die 120 form different temperature intervals, and the heating temperature of each temperature interval can be set independently according to needs. The heating mode can adopt various modes such as liquid heating, steam heating, electric heating, far infrared heating and the like. In an embodiment, the heating device includes a heating ring (not shown) for heating the outer walls of the main mold 120 and the barrel, and the heating ring is wound around the outside of the main mold 120 and the barrel or is disposed inside the main mold 120 and the barrel.

In order to improve the yield of the polyether-ether-ketone pipe, along the advancing direction of the material, the plasticizing extrusion system can be sequentially divided into four heating sections with different temperatures, namely a charging area, a melting area, a homogenizing area and a joint area according to the heating temperatures of the heating device to different positions of the plasticizing extrusion system. In one embodiment, the feeding zone is from 1/4 to 1/3 sections of the screw 60, the melting zone is from 1/4 to 1/3 sections of the screw 60, the homogenizing zone is from 1/4 to 1/3 sections of the screw 60, the two adjacent sections are separated by the same or different distances, and the joint zone is the connecting part of the screw 60 and the main mold 120. Different heating rings which can be independently controlled are arranged outside or inside the charging barrel of different sections, the heating temperature of the heating ring of the charging area can be 390-400 ℃, the heating temperature of the heating ring of the melting area can be 395-400 ℃, the heating temperature of the heating ring of the homogenizing area can be 395-400 ℃, and the heating temperature of the heating ring of the joint area can be 395-400 ℃.

In an embodiment, the polyetheretherketone pipe production equipment further comprises a feeding device, the feeding device is arranged corresponding to a feeding area of the plasticizing extrusion system and comprises a hopper 30 and a dryer 40, the feeding device feeds materials into the production equipment through the hopper 30, the fed polyetheretherketone raw materials are dried by the dryer 40 and then enter a material cylinder of the feeding area of the plasticizing extrusion system, and plasticizing extrusion is performed under the cooperation of a screw 60.

The screw 60 may be an isometric graded plasticating extrusion screw. In one embodiment, the screw 60 has a rod length and a rod diameter ratio of 28:1 to 30:1, and a compression ratio of 3:2 to 3: 1. The cooperation of the screw 60 and the barrel plasticizes the peek material into a uniform and continuous melt.

The main mold 120 includes an outer mold sleeve 122 and a diverging cone 124 sleeved inside the outer mold sleeve 122, and a passage for material to flow is formed between the outer mold sleeve 122 and the diverging cone 124, so that the material enters between the core mold 140 and the forming pipe mold 160 from a plasticizing extrusion system. The material is discharged through the reposition of redundant personnel of reposition of redundant personnel awl 124, can avoid molding system deposit too much, the tubular product wall thickness that the ejection of compact inequality leads to differs, the tolerance is too big, finished product surface defect scheduling problem, reduce lou material, the probability of output defective products and newspaper waste product, weaken the backpressure of mould die cavity simultaneously, improved because of the backpressure that produces among the extrusion process leads to the mar on finished product surface, strain, black spot scheduling problem, greatly reduced manufacturing cost. Preferably, the taper of the diverging cone 124 is 50 degrees to 55 degrees.

The inner cavity of the main mold 120 is preferably smooth and streamlined, and along the advancing direction of the material, the main mold 120 can be sequentially divided into three different temperature heating sections, namely a first temperature zone, a second temperature zone and a third temperature zone, according to the heating temperature of the heating device to different positions of the main mold. In one embodiment, along the material advancing direction, the first temperature zone is from 1/4 to 1/3 sections at the front of the main mold 120, the second temperature zone is from 1/4 to 1/3 sections at the middle of the main mold 120, the third temperature zone is from 1/4 to 1/3 sections at the back of the main mold 120, the two adjacent sections have the same or different distance intervals, different independently controllable heating rings are arranged outside or inside the main mold 120 of different sections, the heating temperature of the heating ring of the first temperature zone is from 380 to 390 ℃, and the heating temperature of the heating ring of the second temperature zone is from 380 to 390 ℃; the heating temperature of the heating ring in the third temperature zone is 360-370 ℃.

To facilitate the removal and replacement of the master mold 120, in one embodiment, the plasticizing extrusion system further includes a material nozzle 80, the material nozzle 80 being connected between the master mold 120 and the barrel. The nozzle 80 is connected to the barrel through the flange joint 70 and is correspondingly connected to the inner hole of the barrel, and is connected to the main mold 120 through a square plate and is correspondingly connected to the inner hole of the main mold 120. The material nozzle 80 is positioned in a joint area of the plasticizing extrusion system, and a heating device is also arranged outside the material nozzle 80, wherein the heating temperature is preferably 395-400 ℃. Compared with the traditional connection mode of the die and the charging barrel, the connection method is simple, the probability of material leakage caused by the damage of equipment in the replacement process is reduced, and the phenomenon of short circuit and electric leakage caused by the fact that the material leakage is adhered to the inside of the heating device is avoided.

Referring to fig. 2, in one embodiment, the core mold 140 has a hollow inner cavity 142, and the second cooling element includes a second cooling circulation line 230, and the hollow inner cavity 142 is communicated with the second cooling circulation line 230 for circulating a cooling medium through the hollow inner cavity 142 to cool the core mold 140.

In one embodiment, the outer wall of the forming tube mold 160 is provided with a cooling jacket 162, and the first cooling element comprises a first cooling circulation line 210, and the cooling jacket 162 is communicated with the first cooling circulation line 210 for circulating a cooling medium through the hollow inner cavity 142 to cool the forming tube mold 160.

The temperatures of the cooling mediums introduced into the first cooling circulation line 210 and the second cooling circulation line 230 may be the same or different. The first cooling circulation line 210 and the second cooling circulation line 230 are supplied with cooling mediums having different temperatures, so that the two cooling circulation systems are independent of each other, thereby facilitating independent control and conditions of the temperatures of the molded pipe mold 160 and the core mold 140. The first cooling circulation pipeline 210 and the second cooling circulation pipeline 230 are filled with cooling media with the same temperature, so that the two cooling circulation systems are connected in series, the cost is reduced, and the complexity of the equipment is simplified.

In one embodiment, the first cooling element and the second cooling element are used to maintain the same temperature of the molded tube mold 160 and the core mold 140.

In one embodiment, the cooling medium introduced into the first cooling circulation pipeline 210 and the second cooling circulation pipeline 230 is heat transfer oil with a temperature of 210 ℃ to 230 ℃, the heat transfer oil and the melt material have a temperature difference, and the temperature of the melt material is reduced to 210 ℃ to 230 ℃ through continuous circulation of the heat transfer oil.

The first cooling circulation pipeline 210 and the second cooling circulation pipeline 230 are made of stainless steel high-temperature hoses.

Referring to fig. 3, a partition 144 is disposed in the hollow inner cavity 142 of the core mold 140, and the partition 144 separates a closed cavity 146 away from the main mold 120 in the hollow inner cavity 142 of the core mold 140, so that a cooling medium is confined in the closed cavity 146 and the material molded by the core mold 140 is prevented from being cooled too early. Preferably, the length of the closed cavity 146 is 2/3-4/5 of the length of the mandrel 140. The material of the partition 144 may be stainless steel, and more preferably, 304 stainless steel.

A certain proportional relation exists between the wall thickness of the polyether-ether-ketone pipe and the length of the cooling section. Preferably, the length of the core mold 140 can be determined according to the inner diameter and wall thickness of the product. The thicker the wall thickness of the product, the longer the length of the mandrel 140. In one embodiment, the length of the core mold 140 is l, the inner diameter of the pipe mold 160 is R, and the outer diameter of the core mold 140 is R, l (R-R)/2 is 10:1 to 3: 4.

Further, the too long length of the forming pipe die 160 can also cause the polyether-ether-ketone pipe to generate back pressure in the extrusion process, resulting in the occurrence of the problems of scratches, strain, black spots and the like on the surface of a finished product. Preferably, the length of the forming pipe die 160 is L, the inner diameter of the forming pipe die 160 is R, the outer diameter of the core die 140 is R, and L (R-R)/2 is 20: 1-3: 4.

In addition, the smoothness of the outer wall of the core mold 140 and the inner wall of the molded tube mold 160 also has an effect on the finished product. The outer wall of the core mold and the inner wall of the forming pipe mold have higher smoothness, the back pressure of a mold cavity can be reduced, the product defects caused by pulling the mold can be avoided, the yield is improved, and the surface and the inside of a finished product are smoother. In one embodiment, the inner wall of the forming tube 160 and the outer wall of the core mold 140 have smooth, non-stick protective layers. Preferably, the non-stick material protective layer is a high-temperature paint layer or an electroplated layer, and the smoothness of the outer wall of the core mold and the inner wall of the formed pipe mold can be improved.

Referring to fig. 1, the transmission system includes a rotating device including a motor 10 and a reduction box 20, and a traction device 300. The motor 10 drives the screw 60 to provide the torque and rotation speed required by the screw 60 during the extrusion process, so that the screw 60 maintains a certain shear rate, and the reduction gearbox 20 can change the speed of the screw 60. In the material advancing direction, the traction device 300 is arranged behind the forming die 160, and the traction device 300 is used for providing traction power and traction speed to pull the primarily formed polyether-ether-ketone pipe out of the forming system. In one embodiment, the traction speed of the traction device is 5 r/min-12 r/min, the rotating speed of the screw 60 in the plasticizing extrusion system is 18 r/min-30 r/min, and the difference between the advancing speed of the material and the traction speed of the traction device and the material is caused by the rotating speed of the screw 60, so that the material is subjected to a certain pressure during cooling and shaping, and the structure of a pipe product is tighter.

Draw gear 300 includes transmission, roller closing device and brake gear, adjusts the elasticity degree that roller closing device pressed from both sides tight tubular product through brake gear, increases frictional force, for not stereotyping the fuse-element provides pressure, makes tubular product structure inseparabler, adjusts the wall thickness and the eccentricity of tubular product simultaneously and reduces the external diameter tolerance of tubular product.

The polyether-ether-ketone pipe production equipment further comprises a cutting device 400, wherein the cutting device 400 is installed behind the outlet of the traction device 300 and used for cutting the polyether-ether-ketone pipe into sections. The cutting device is preferably a band sawing machine, wheels and rails are welded at the bottom of the band sawing machine, the cutting device can extrude and cut while not clamping bent saw blades in the production process, and two ends of the surface of a cut pipe finished product are smoother.

The control system 50 includes electrical instruments and actuators for automatically controlling the rotational speed of the screw 60 and the temperature, pressure, flow rate and product quality of the entire production facility during the production process.

The embodiment of the invention also provides a manufacturing method of the polyether-ether-ketone pipe by using the production equipment of the polyether-ether-ketone pipe, which comprises the following steps:

s20, plasticizing materials through heating of the plasticizing extrusion system, and extruding the plasticized materials into the molding system; and

and S30, enabling the plasticized material to enter the core mold and the forming pipe mold through the main mold for forming, and simultaneously enabling the outer wall and the inner wall of the forming pipe to be cooled and shaped at the same speed through a cooling device.

In an embodiment, in step S20, in the step of plasticizing the material by heating of the plasticizing extrusion system, the plasticizing extrusion system may be divided into four zones for heating. Specifically, along the advancing direction of the material, the plasticizing extrusion system is sequentially divided into a feeding area, a melting area, a homogenizing area and a joint area, and the heating temperature of the feeding area is 390-400 ℃; the heating temperature of the melting zone is 395-400 ℃; the heating temperature of the homogenizing zone is 395-400 ℃; the heating temperature of the joint area is 395-400 ℃.

In an embodiment, in step S20, the step of extruding the plasticized material into the molding system includes starting the motor 10 to drive the screw 60 to rotate, and extruding the plasticized material by using the rotation of the screw 60, wherein the rotation speed of the screw 60 is 18r/min to 30 r/min.

In one embodiment, step S30, the step of forming the plasticized material into the core mold and the forming tube mold by the main mold further includes heating the main mold at a constant temperature in three zones to keep the material in a certain viscosity for forming. Specifically, along the advancing direction of the material, the main die is sequentially divided into a first temperature area, a second temperature area and a third temperature area, wherein the temperature of the first temperature area is 380-390 ℃, and the temperature of the second temperature area is 380-390 ℃; the temperature of the third temperature zone is 360-370 ℃.

In the step S30, in the step of simultaneously cooling and shaping the outer wall and the inner wall of the formed pipe by the cooling device, the temperature of the cooling medium in the cooling device is 210 ℃ to 230 ℃.

Preferably, the outer wall and the inner wall of the formed pipe are cooled and shaped at the same speed by controlling the temperature of the first cooling element and the second cooling element.

The manufacturing method also comprises a step S10 of drying the polyetheretherketone material to ensure that the moisture content of the material is lower than 0.2%;

in the step S10, the drying step may be performed by using circulating hot air to dry the polyetheretherketone raw material, where the temperature of the circulating hot air is preferably 130 ℃ to 180 ℃, and more preferably 160 ℃; the drying time is 4 to 6 hours.

The manufacturing method further includes step S40 and step S50:

s40, pulling the pipe out of the forming die through the pulling force of the pulling device, adjusting the brake block to clamp the pipe, and adjusting the tolerance of the outer diameter of the pipe; and

and S50, measuring the length by using a tape measure, and starting the cutting device to cut the pipe.

In the step S40, the traction force is 594N-810N, and the traction speed is 5 r/min-12 r/min; the step of enabling the structure of the extruded finished product to be compact and adjusting the outer diameter tolerance of the pipe simultaneously comprises the steps of clamping the pipe by adjusting the tightness of a brake strip of a brake seat, and reducing the outer diameter tolerance of the pipe by adjusting the wall thickness and the eccentricity of the pipe by adjusting the tightness of a brake.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The production equipment of the polyether-ether-ketone pipe is characterized by comprising a plasticizing extrusion system, a transmission system, a forming system and a control system;

the molding system comprises a pipe mold and a cooling device;

2. The PEEK tubing production apparatus of claim 1, wherein the first cooling element and the second cooling element are configured to maintain the same temperature of the molded tube mold and the core mold.

3. The PEEK pipe production apparatus of claim 1, wherein the core mold has a hollow inner cavity, and the second cooling element includes a second cooling circulation line, and the hollow inner cavity is communicated with the second cooling circulation line, so that a cooling medium is circulated through the hollow inner cavity to cool the core mold.

4. The PEEK pipe production apparatus of claim 3, wherein a partition is disposed in the hollow inner cavity of the core mold, and the partition separates a closed cavity away from the main mold in the hollow inner cavity of the core mold for containing the cooling medium.

5. The PEEK pipe production equipment of claim 4, wherein the length of the closed cavity accounts for 2/3-4/5 of the length of the core mold.

6. The polyether-ether-ketone pipe production equipment according to claim 1, wherein the length of the core mold is l, the inner diameter of the forming pipe mold is R, and the outer diameter of the core mold is R, l (R-R)/2, which is 10: 1-3: 4.

7. The polyether-ether-ketone pipe production equipment according to claim 1, wherein the length of the forming pipe die is L, the inner diameter of the forming pipe die is R, and the outer diameter of the core die is R, wherein R-R/2 is 20: 1-3: 4.

8. The PEEK pipe production equipment according to claim 1, wherein the main mold comprises an outer mold sleeve and a spreader cone sleeved inside the outer mold sleeve, a channel for the material to flow is formed between the outer mold sleeve and the spreader cone, so that the material enters the space between the core mold and the forming pipe mold from the plasticizing extrusion system, and the taper of the spreader cone is 50-55 degrees.

9. The polyether-ether-ketone pipe production equipment according to claim 1, wherein the plasticizing extrusion system is sequentially divided into a feeding area, a melting area, a homogenizing area and a joint area along the material advancing direction, and the heating temperature of the feeding area is 390-400 ℃; the heating temperature of the melting zone is 395-400 ℃; the heating temperature of the homogenizing zone is 395-400 ℃; the heating temperature of the joint area is 395-400 ℃.

10. The PEEK pipe production equipment according to claim 1, wherein the main mold is sequentially divided into a first temperature area, a second temperature area and a third temperature area along the material advancing direction, the temperature of the first temperature area is 380-390 ℃, and the temperature of the second temperature area is 380-390 ℃; the temperature of the third temperature zone is 360-370 ℃.

11. The PEEK pipe production equipment of claim 1, wherein a rotation speed of a screw in the plasticizing extrusion system is 18r/min to 30 r/min.

12. The PEEK pipe production apparatus of claim 1, wherein the transmission system comprises a traction device, the traction device is disposed behind the forming mold in a material advancing direction, the traction device is used for providing traction power and traction speed to pull the PEEK pipe out of the forming system, and the traction speed of the traction device is 5 r/min-12 r/min.

13. A method for manufacturing a polyetheretherketone pipe using the polyetheretherketone pipe manufacturing apparatus according to any one of claims 1 to 12, comprising the steps of:

14. The PEEK pipe production equipment according to claim 1, wherein the outer wall and the inner wall of the formed pipe are cooled and shaped at the same speed by controlling the temperature of the first cooling element and the second cooling element.