CN113752503A

CN113752503A - Polytetrafluoroethylene injection mold and injection molding process thereof

Info

Publication number: CN113752503A
Application number: CN202111126800.4A
Authority: CN
Inventors: 李同裕
Original assignee: Walford Yangzhou Semiconductor New Material Co ltd
Current assignee: Walford Yangzhou Semiconductor New Material Co ltd
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2021-12-07

Abstract

The invention discloses a polytetrafluoroethylene injection mold and an injection process thereof, and the injection mold comprises a bottom plate, wherein the upper end of the bottom plate is respectively and fixedly provided with four guide rods and four first supporting legs, the upper ends of the four guide rods are jointly provided with a mold assembly, the upper ends of the four first supporting legs are jointly and fixedly provided with a fixed template, the middle part of the upper end of the fixed template is provided with an injection groove, the left side and the right part of the upper end of the fixed template are respectively and fixedly provided with a group of second supporting legs, the upper end of each group of fixed template is fixedly provided with a partition plate, the right part of the upper end of the fixed template is penetrated with a cooling assembly, the middle part of the upper end of the bottom plate is fixedly provided with a jacking mechanism, and the upper end of the jacking mechanism penetrates through the lower end of the fixed template and extends into the injection groove. According to the polytetrafluoroethylene injection mold and the injection molding process thereof, the cooling effect is improved, the service life of the injection mold is ensured, the heat energy can be recycled, the demolding operation does not need manual control, and the demolding operation is convenient and fast.

Description

Polytetrafluoroethylene injection mold and injection molding process thereof

Technical Field

The invention relates to the technical field of injection molding, in particular to a polytetrafluoroethylene injection mold and an injection molding process thereof.

Background

The polytetrafluoroethylene is called as 'plastic king', and has the advantages of excellent comprehensive performance, high temperature resistance, corrosion resistance, non-sticking, self-lubricating, excellent dielectric property and very low friction coefficient. The product can be used as engineering plastic to be made into polytetrafluoroethylene tubes, rods, belts, plates, films and the like, and is generally applied to corrosion-resistant pipelines, containers, pumps, valves, radar, high-frequency communication equipment, radio equipment and the like with higher performance requirements. However, the existing polytetrafluoroethylene often has the following problems in the injection molding process: 1. the existing injection mold has poor cooling effect, and water drops are easily formed on the inner wall of the heat exchange in the heat exchange process in the cooling process, so that the heat exchange inner cavity is easily rusted, and the service life of the injection mold is influenced; 2. the heat energy generated in the existing injection molding process can not be effectively recycled, so that the energy consumption is improved, and the modern energy-saving and environment-friendly concept is not met; 3. the existing molding die piece finished by injection molding is inconvenient to carry out timely demolding operation, the demolding operation usually needs manual control, and the operation is complex.

Disclosure of Invention

The invention mainly aims to provide a polytetrafluoroethylene injection mold and an injection molding process thereof, which can effectively solve the problems in the background art.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides a polytetrafluoroethylene injection mold, includes the bottom plate, the bottom plate upper end is fixed mounting respectively has four guide arms and four supporting legss one, four the guide arm upper end is provided with the mould subassembly jointly, four the common fixed mounting in supporting legs upper end has the fixed die plate, open at fixed die plate upper end middle part has the recess of moulding plastics, the equal fixed mounting in fixed die plate upper end left side and upper end right part has a set of No. two supporting legss, every group No. two supporting legss quantity is four, every group the equal fixed mounting in fixed die plate upper end has the baffle, the fixed die plate upper end right part runs through there is cooling module, cooling module is located right side baffle below, the fixed die plate matches with the mould subassembly, bottom plate upper end middle part fixed mounting has jack-up mechanism, jack-up mechanism upper end runs through the fixed die plate lower extreme and extends to inside the recess of moulding plastics.

Preferably, No. three pipes run through in fixed die plate upper end left part, No. three pipe surface upper portion fixed mounting have the heat exchange tube, fixed die plate upper end left part fixed mounting has heat exchange water tank, the heat exchange tube front end runs through the heat exchange water tank rear end and extends to inside the heat exchange water tank, heat exchange tube front end fixedly connected with blast pipe, the blast pipe front end runs through the heat exchange water tank front end and extends to the heat exchange water tank outside, heat exchange water tank left end fixedly connected with two conveyer pipes, two the equal fixed mounting in conveyer pipe middle part has the valve.

Preferably, it has two perforation to mould plastics recess lower extreme opening, fixed die plate inside respectively fixed mounting have a plurality of No. two guide plates and a plurality of guide plate, and is a plurality of about interval staggered distribution between No. two guide plates and a plurality of guide plate, a plurality of No. two guide plates, a plurality of guide plate and fixed die plate inner wall enclose into a snakelike wind channel jointly.

Preferably, the cooling assembly comprises a first guide pipe, a fan is fixedly connected to the upper portion of the outer surface of the first guide pipe, a dryer is fixedly connected to the front end of the fan, an air inlet pipe is fixedly connected to the front end of the dryer, a second guide pipe is fixedly connected to the lower end of the first guide pipe, and a plurality of exhaust hoods are fixedly connected to the lower end of the second guide pipe.

Preferably, the first guide pipe penetrates through the right part of the upper end of the fixed template, the exhaust hoods are located inside the fixed template, and the lower end of the fan and the lower end of the dryer are fixedly connected with the upper end of the fixed template.

Preferably, the jacking mechanism comprises a jacking plate, two guide pillars are fixedly mounted at the lower end of the jacking plate, telescopic rods are fixedly mounted at the lower ends of the guide pillars, springs are fixedly connected to the outer surfaces of the telescopic rods, the lower ends of the springs are fixedly connected with the upper end of the bottom plate, the upper ends of the guide pillars penetrate through the inner portion of the perforation, the jacking plate is located inside the injection molding groove, and the jacking plate is matched with the injection molding groove.

Preferably, the mold assembly comprises a top plate, a cylinder is fixedly mounted at the upper end of the top plate, a lifting rod is fixedly mounted at the output end of the cylinder, a movable template is fixedly mounted at the lower end of the lifting rod, a boss is fixedly mounted at the lower end of the movable template, and is matched with the injection molding groove, and four guide rods are fixedly connected with the lower end of the top plate and penetrate through four corners of the movable template.

An injection molding process of a polytetrafluoroethylene injection mold is characterized in that: the method comprises the following steps:

step one, preparing polytetrafluoroethylene molten liquid, placing polytetrafluoroethylene raw materials into a high-speed stirrer for stirring operation, then introducing the mixed polytetrafluoroethylene raw materials into a preheating piece, and then feeding the preheated polytetrafluoroethylene raw materials into a melting device for heating operation to obtain the polytetrafluoroethylene molten liquid;

step two, injection molding operation, namely introducing the polytetrafluoroethylene molten liquid obtained in the step one into an injection molding machine, and injecting the polytetrafluoroethylene molten liquid into an injection molding groove on a fixed template by using the injection molding machine;

step three, mold closing operation, namely driving an air cylinder to operate, enabling a movable mold plate at the lower end of a lifting rod to descend and enabling a protruding part to descend, enabling the descending protruding part to be in mold closing operation with an injection molding groove, enabling a jacking plate to descend under the pressure action of a mold assembly in the mold closing process, and enabling a spring at the lower end of a guide pillar to be compressed for energy storage;

step four, cooling operation, namely starting a fan, conveying external air into a dryer through an air inlet pipe for drying, conveying the dried air through a first guide pipe and a second guide pipe, spraying the dried air into the fixed die plate through an exhaust hood, moving the air along a snake-shaped air channel which is defined by a plurality of second guide plates, a plurality of first guide plates and the inner wall of the fixed die plate together, performing heat exchange operation on air flow and heat energy in the injection molding groove, and spraying the heat-exchanged air flow from a third guide pipe to realize the cooling operation of the die piece in the injection molding groove;

step five, heat energy recovery, wherein the discharged gas carries out heat exchange operation with the water body in the heat exchange water tank through the heat exchange tube, the gas after heat exchange is sprayed out from the exhaust tube, and the water body after heat exchange operation is discharged through the conveying tube and is used by the preheating part in the step one, so that heat energy recovery is realized;

and sixthly, demolding operation, namely after injection molding and cooling are finished, driving operation by using an air cylinder to separate the protruding part from the inside of the injection molding groove, so that mold opening is realized, and in the mold opening process, the jacking plate moves upwards under the action of spring compression elasticity to drive a mold part formed in the injection molding groove to jack up, so that demolding operation is realized.

Compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, the first guide plate, the second guide plate and the inner wall of the fixed template commonly form the serpentine air channel, so that the introduced gas moves along with the serpentine air channel, the gas flow can fully exchange heat with the heat energy in the injection molding groove, the heat exchange time of the gas in the fixed template is prolonged, and the cooling effect is improved; and the introduced gas is dry airflow dried by the dryer, so that the rusting of the heat exchange inner cavity can be effectively avoided, and the service life of the injection mold is ensured.

2. According to the invention, the discharged heat exchange airflow is subjected to heat exchange operation with the water body in the heat exchange water tank through the heat exchange pipe, and the water body subjected to heat exchange operation is discharged through the conveying pipe and is preheated by the preheating part, so that heat energy recycling is realized, energy consumption is reduced, and the modern energy-saving and environment-friendly concept is met.

3. According to the invention, through the arrangement of the jacking mechanism and the die assembly, the compression energy storage operation of the jacking mechanism is automatically completed by the die assembly in the die assembly process, and along with the die opening operation of the die assembly, the jacking plate on the jacking mechanism moves upwards under the action of the compression elasticity of the spring to drive the die piece formed in the injection groove to jack up, so that the automatic demolding operation is realized, manual control is not needed, and the demolding operation is convenient.

Drawings

FIG. 1 is an overall structure diagram of a polytetrafluoroethylene injection mold and an injection molding process thereof according to the invention;

FIG. 2 is a schematic view of an installation structure of a fixed mold plate of a polytetrafluoroethylene injection mold and an injection molding process thereof according to the invention;

FIG. 3 is a longitudinal sectional view of a fixed mold plate of a polytetrafluoroethylene injection mold and an injection molding process thereof according to the invention;

FIG. 4 is a schematic structural diagram of a cooling assembly of a PTFE injection mold and injection molding process thereof according to the present invention;

FIG. 5 is a schematic structural diagram of a jacking mechanism of a polytetrafluoroethylene injection mold and an injection molding process thereof according to the invention;

FIG. 6 is a schematic structural diagram of a polytetrafluoroethylene injection mold and a mold assembly of an injection molding process thereof according to the invention.

In the figure: 1. a base plate; 2. a first supporting leg; 3. a cooling assembly; 4. fixing a template; 5. a jack-up mechanism; 6. a mold assembly; 7. a guide bar; 8. injection molding a groove; 9. a second supporting leg; 10. a partition plate; 31. a first catheter; 32. a fan; 33. a dryer; 34. an air inlet pipe; 35. a second catheter; 36. an exhaust hood; 41. a third catheter; 42. a heat exchange pipe; 43. a heat exchange water tank; 44. a delivery pipe; 45. a valve; 46. an exhaust pipe; 47. perforating; 48. a first baffle; 49. a second air deflector; 51. jacking up the plate; 52. a guide post; 53. a telescopic rod; 54. a spring; 61. a cylinder; 62. a top plate; 63. a lifting rod; 64. moving the template; 65. a raised portion.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-6, the technical solution provided in this embodiment is as follows:

the utility model provides a polytetrafluoroethylene injection mold, comprising a

base plate

1, 1 upper end of bottom plate is fixed mounting respectively four guide arms 7 and four supporting legss 2 No. one, 7 upper ends of four guide arms are provided with mould subassembly 6 jointly, 2 common fixed mounting in upper end of four supporting legss have fixed die plate 4, open at 4 upper end middle parts of fixed die plate has

injection molding recess

8, 4 upper end left sides of fixed die plate and the equal fixed mounting in upper end right part have a set of No. two supporting

legss

9, 9 quantity of every group's supporting legss are four, 4 upper end equal fixed mounting of every group fixed die plate has

baffle

10, 4 upper end right parts of fixed die plate run through there is cooling module 3, cooling module 3 is located 10 belows on the right side baffle, fixed die plate 4 matches with

mould subassembly

6, 1 upper end middle part fixed mounting of bottom plate has jack-up mechanism 5, jack-up mechanism 5 upper end runs through fixed die plate 4 lower extremes and extends to inside injection molding recess 8.

Specifically, referring to fig. 2-4, a third guide pipe 41 penetrates through the left part of the upper end of the fixed die plate 4, a heat exchange pipe 42 is fixedly installed on the upper part of the outer surface of the third guide pipe 41, a heat exchange water tank 43 is fixedly installed on the left part of the upper end of the fixed die plate 4, the front end of the heat exchange pipe 42 penetrates through the rear end of the heat exchange water tank 43 and extends into the heat exchange water tank 43, an exhaust pipe 46 is fixedly connected to the front end of the heat exchange pipe 42, the front end of the exhaust pipe 46 penetrates through the front end of the heat exchange water tank 43 and extends out of the heat exchange water tank 43, two conveying pipes 44 are fixedly connected to the left end of the heat exchange water tank 43, and valves 45 are fixedly installed in the middles of the two conveying pipes 44; the lower end of the injection molding groove 8 is provided with two through holes 47, a plurality of second guide plates 49 and a plurality of first guide plates 48 are respectively and fixedly arranged in the fixed template 4, the plurality of second guide plates 49 and the plurality of first guide plates 48 are vertically distributed in a staggered manner at intervals, and the plurality of second guide plates 49, the plurality of first guide plates 48 and the inner wall of the fixed template 4 jointly enclose a snake-shaped air duct; the cooling assembly 3 comprises a first guide pipe 31, a fan 32 is fixedly connected to the upper part of the outer surface of the first guide pipe 31, a dryer 33 is fixedly connected to the front end of the fan 32, an air inlet pipe 34 is fixedly connected to the front end of the dryer 33, a second guide pipe 35 is fixedly connected to the lower end of the first guide pipe 31, and a plurality of exhaust hoods 36 are fixedly connected to the lower end of the second guide pipe 35; no. one pipe 31 runs through the upper end right part of fixed die plate 4, and a plurality of exhaust hoods 36 all are located inside fixed die plate 4, and fan 32 lower extreme and desiccator 33 lower extreme all with fixed die plate 4 upper end fixed connection.

In the specific embodiment of the invention, the dry gas is conveyed through the first guide pipe 31 and the second guide pipe 35 and is sprayed into the fixed die plate 4 through the exhaust hood 36, the gas moves along with the serpentine air channel which is defined by the plurality of second guide plates 49, the plurality of first guide plates 48 and the inner wall of the fixed die plate 4 together, the gas flow and the heat energy in the injection molding groove 8 perform sufficient heat exchange, the time of the gas in the fixed die plate 4 is prolonged, and the cooling effect is improved.

Specifically, referring to fig. 5 and 6, the jacking mechanism 5 includes a jacking plate 51, two guide posts 52 are fixedly mounted at the lower end of the jacking plate 51, telescopic rods 53 are fixedly mounted at the lower ends of the two guide posts 52, springs 54 are fixedly connected to the outer surfaces of the telescopic rods 53, the lower ends of the springs 54 are fixedly connected to the upper end of the base plate 1, the upper ends of the guide posts 52 penetrate through the inside of the through holes 47, the jacking plate 51 is located inside the injection molding groove 8, and the jacking plate 51 is matched with the injection molding groove 8; mould subassembly 6 includes roof 62, and roof 62 upper end fixed mounting has cylinder 61, and cylinder 61 output fixed mounting has lifter 63, and lifter 63 lower extreme fixed mounting has movable mould board 64, and movable mould board 64 lower extreme fixed mounting has bellying 65, and bellying 65 matches with the recess 8 of moulding plastics, and four guide arms 7 upper ends all run through movable mould board 64 four corners and with roof 62 lower extreme fixed connection.

In the embodiment of the present invention, the cylinder 61 is driven to separate the protrusion 65 from the inside of the injection groove 8, so as to open the mold, and the jacking plate 51 moves upward under the compression and elasticity of the spring 54 during the mold opening process, so as to drive the mold member formed in the injection groove 8 to jack up.

An injection molding process of a polytetrafluoroethylene injection mold comprises the following steps:

step two, injection molding operation, namely introducing the polytetrafluoroethylene molten liquid obtained in the step one into an injection molding machine, and injecting the polytetrafluoroethylene molten liquid into an injection molding groove 8 on the fixed template 4 by using the injection molding machine;

step three, mold closing operation, namely, driving the cylinder 61 to operate, lowering the movable mold plate 64 and the lug boss 65 at the lower end of the lifting rod 63, performing mold closing operation on the lowered lug boss 65 and the injection molding groove 8, lowering the jacking plate 51 under the pressure action of the mold assembly 6 in the mold closing process, and compressing and storing energy by the spring 54 at the lower end of the guide pillar 52;

step four, cooling operation, namely starting a fan 32, conveying external air into a dryer 33 through an air inlet pipe 34 for drying, conveying the dried air through a first guide pipe 31 and a second guide pipe 35 and spraying the dried air into the fixed die plate 4 through an exhaust hood 36, wherein the air moves along with a snake-shaped air channel which is defined by a plurality of second guide plates 49, a plurality of first guide plates 48 and the inner wall of the fixed die plate 4 together, the air flow and heat energy in the injection molding groove 8 perform heat exchange operation, and the heat exchange air flow is sprayed out from a third guide pipe 41 to realize the cooling operation of the die piece in the injection molding groove 8;

step five, heat energy recovery, wherein discharged gas flows through the heat exchange pipe 42 to perform heat exchange operation with the water body in the heat exchange water tank 43, the gas after heat exchange is sprayed out from the exhaust pipe 46, and the water body after heat exchange operation is discharged through the conveying pipe 44 and is used by the preheating part in the step one, so that heat energy recovery is realized;

and sixthly, demolding operation, namely after injection molding and cooling are finished, driving operation is carried out by the air cylinder 61, so that the boss 65 is separated from the inside of the injection molding groove 8, mold opening is realized, the jacking plate 51 moves upwards under the action of the compression elasticity of the spring 54 in the mold opening process, and a mold piece formed in the injection molding groove 8 is driven to jack up, so that demolding operation is realized.

The invention is a polytetrafluoroethylene injection mold and its injection process, firstly put polytetrafluoroethylene raw materials into high speed stirrer to stir, then put the mixed polytetrafluoroethylene raw materials into preheating piece, then send the preheated polytetrafluoroethylene raw materials into melting device to heat, get polytetrafluoroethylene melt, then put the obtained polytetrafluoroethylene melt into injection machine, use injection machine to inject polytetrafluoroethylene melt into injection groove 8 on fixed template 4, drive cylinder 61 to work, the movable template 64 and the protruding part 65 at the lower end of lifting rod 63 descend, the protruding part 65 and the injection groove 8 go on film combination work, the jacking plate 51 goes down under the pressure of mold assembly 6 in the film combination process, the spring 54 at the lower end of guide post 52 goes on compression energy storage, then the fan 32 is started, the outside air is conveyed into the dryer 33 through the air inlet pipe 34 for drying, the dried air is conveyed through the first guide pipe 31 and the second guide pipe 35 and sprayed into the inside of the fixed die plate 4 through the exhaust hood 36, the air moves along with the serpentine air channel enclosed by the second guide plates 49, the first guide plates 48 and the inner wall of the fixed die plate 4 together, the air flow and the heat energy inside the injection molding groove 8 perform heat exchange operation, the heat exchange air flow is sprayed out from the third guide pipe 41 to realize the cooling operation of the die part inside the injection molding groove 8, the discharged air flow performs heat exchange operation with the water inside the heat exchange water tank 43 through the heat exchange pipe 42, the heat exchange completed air is sprayed out from the exhaust pipe 46, the water after heat exchange operation is discharged through the conveying pipe 44 and used by the preheating part in the first step, the heat energy recovery is realized, after the injection molding and cooling is completed, the air cylinder 61 drives the operation to separate the bulge 65 from the inside of the injection molding groove 8, and (3) realizing die opening, wherein the jacking plate 51 moves upwards under the action of the compression elasticity of the spring 54 in the die opening process to drive the die piece formed in the injection molding groove 8 to jack up, so that the demolding operation is realized.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A polytetrafluoroethylene injection mold comprises a bottom plate (1), and is characterized in that: the upper end of the bottom plate (1) is respectively fixedly provided with four guide rods (7) and four first supporting legs (2), the upper ends of the four guide rods (7) are jointly provided with a mold assembly (6), the upper ends of the four first supporting legs (2) are jointly and fixedly provided with a fixed template (4), the middle part of the upper end of the fixed template (4) is provided with an injection molding groove (8), the left side and the right part of the upper end of the fixed template (4) are respectively and fixedly provided with a group of second supporting legs (9), each group of the second supporting legs (9) is four, the upper end of the fixed template (4) of each group is respectively and fixedly provided with a partition plate (10), the right part of the upper end of the fixed template (4) penetrates through a cooling assembly (3), the cooling assembly (3) is positioned below the partition plate (10) on the right side, the fixed template (4) is matched with the mold assembly (6), and the middle part of the upper end of the bottom plate (1) is fixedly provided with a jacking mechanism (5), the upper end of the jacking mechanism (5) penetrates through the lower end of the fixed die plate (4) and extends into the injection molding groove (8).

2. A polytetrafluoroethylene injection mold according to claim 1, wherein: fixed die plate (4) upper end left part runs through there are No. three pipe (41), No. three pipe (41) surface upper portion fixed mounting has heat exchange tube (42), fixed die plate (4) upper end left part fixed mounting has heat exchange water tank (43), inside heat exchange tube (42) front end runs through heat exchange water tank (43) rear end and extends to heat exchange water tank (43), heat exchange tube (42) front end fixedly connected with blast pipe (46), blast pipe (46) front end runs through heat exchange water tank (43) front end and extends to heat exchange water tank (43) outside, two conveyer pipe (44) of heat exchange water tank (43) left end fixedly connected with, two equal fixed mounting has valve (45) in conveyer pipe (44) middle part.

3. A polytetrafluoroethylene injection mold according to claim 1, wherein: it has two perforation (47) to mould plastics recess (8) lower extreme to open, fixed die plate (4) inside respectively fixed mounting have a plurality of No. two guide plates (49) and a plurality of guide plate (48), a plurality of interval staggered distribution about No. two between guide plate (49) and a plurality of guide plate (48) is a plurality of No. two guide plate (49), a plurality of guide plate (48) and fixed die plate (4) inner wall enclose synthetic snakelike wind channel jointly.

4. A polytetrafluoroethylene injection mold according to claim 1, wherein: cooling unit (3) are including a pipe (31), No. one pipe (31) surface upper portion fixedly connected with fan (32), fan (32) front end fixedly connected with desiccator (33), desiccator (33) front end fixedly connected with air-supply line (34), No. one pipe (31) lower extreme fixedly connected with No. two pipes (35), No. two a plurality of exhaust hoods (36) of pipe (35) lower extreme fixedly connected with.

5. A polytetrafluoroethylene injection mold according to claim 4, wherein: a pipe (31) runs through fixed die plate (4) upper end right part, and is a plurality of exhaust hood (36) all are located inside fixed die plate (4), fan (32) lower extreme and desiccator (33) lower extreme all with fixed die plate (4) upper end fixed connection.

6. A polytetrafluoroethylene injection mold according to claim 1, wherein: the jacking mechanism (5) comprises a jacking plate (51), two guide pillars (52) are fixedly mounted at the lower end of the jacking plate (51), two telescopic rods (53) are fixedly mounted at the lower ends of the guide pillars (52), springs (54) are fixedly connected to the outer surfaces of the telescopic rods (53), the lower ends of the springs (54) are fixedly connected with the upper end of the bottom plate (1), the upper ends of the guide pillars (52) penetrate through the inner part of the through holes (47), the jacking plate (51) is located inside the injection molding groove (8), and the jacking plate (51) is matched with the injection molding groove (8).

7. A polytetrafluoroethylene injection mold according to claim 1, wherein: mould subassembly (6) include roof (62), roof (62) upper end fixed mounting has cylinder (61), cylinder (61) output end fixed mounting has lifter (63), lifter (63) lower extreme fixed mounting has movable mould board (64), movable mould board (64) lower extreme fixed mounting has bellying (65), bellying (65) and injection moulding recess (8) match, four guide arm (7) upper end all runs through movable mould board (64) four corners and with roof (62) lower extreme fixed connection.

8. An injection molding process of a polytetrafluoroethylene injection mold, the injection mold of the polytetrafluoroethylene injection mold according to any one of claims 1-7, characterized in that: the method comprises the following steps:

step two, injection molding operation, namely introducing the polytetrafluoroethylene molten liquid obtained in the step one into an injection molding machine, and injecting the polytetrafluoroethylene molten liquid into an injection molding groove (8) on a fixed template (4) by using the injection molding machine;

step three, performing die assembly operation, namely driving an air cylinder (61) to operate, descending a movable die plate (64) and a boss (65) at the lower end of a lifting rod (63), performing die assembly operation on the descending boss (65) and an injection molding groove (8), descending a jacking plate (51) under the pressure action of a die assembly (6) in the die assembly process, and compressing and storing energy by a spring (54) at the lower end of a guide post (52);

step four, cooling operation is carried out, a fan (32) is started, external air is conveyed into a dryer (33) through an air inlet pipe (34) to be dried, the dried air is conveyed through a first guide pipe (31) and a second guide pipe (35) and is sprayed into the inside of a fixed die plate (4) through an exhaust hood (36), the air moves along with a snake-shaped air duct which is defined by a plurality of second guide plates (49), a plurality of first guide plates (48) and the inner wall of the fixed die plate (4), heat exchange operation is carried out on air flow and heat energy in an injection molding groove (8), the air flow subjected to heat exchange is sprayed out from a third guide pipe (41), and cooling operation of a die piece in the injection molding groove (8) is realized;

step five, heat energy recovery is carried out, the discharged gas flows through the heat exchange pipe (42) to carry out heat exchange operation with the water body in the heat exchange water tank (43), the gas after heat exchange is sprayed out from the exhaust pipe (46), the water body after heat exchange operation is discharged through the conveying pipe (44) and is used by the preheating part in the step one, and heat energy recovery is realized;

and sixthly, demolding operation is carried out, after injection molding and cooling are finished, the air cylinder (61) drives operation, so that the protruding part (65) is separated from the inside of the injection molding groove (8), mold opening is realized, the jacking plate (51) moves upwards under the action of compression elasticity of the spring (54) in the mold opening process, a mold part formed in the injection molding groove (8) is driven to jack up, and demolding operation is realized.