Preparation process of modified PET (Polyethylene Terephthalate) engineering plastic

Abstract

The invention discloses a preparation process of modified PET engineering plastic. The preparation process comprises the following steps: S1, weighing raw materials: weighing PET slices, nano silicon dioxide, magnesium borate whiskers, a coupling agent, an antioxidant and a lubricant and separating for later use; s2, mixing the raw materials: putting the raw materials in the S1 into a mixing machine for mixing and processing to obtain a mixture; the mixture obtained in the step S2 is fed into a double-screw extruder to be subjected to melt blending extrusion, strip drawing, water cooling, grain cutting and drying, a finished product is obtained, the mixing machine comprises a mixing tank, and the invention relates to the technical field of engineering plastic preparation. According to the preparation technology of the modified PET engineering plastic, through the mixing tank, the control rod, the feeding pipe, the branch cylinder, the funnel, the discharging pipe, the dispersing plate I, the dispersing plate II and the gear ring, raw materials are conveniently put into the mixing tank, the raw materials are dispersed through the dispersing plate I and the dispersing plate II, the raw materials are prevented from caking, the raw materials are mixed through the stirring rod, and the raw material mixing effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of engineering plastic preparation, in particular to a process for preparing modified PET engineering plastic. Background Art

[0002] Modified engineering plastics refer to plastics that, based on general-purpose and engineering plastics, have been processed through methods such as filling, blending, and reinforcement to enhance their flame retardancy, strength, impact resistance, and toughness. As one of the most important types of engineering plastics, PET possesses significant vitality, primarily due to its high performance achieved through modification. Furthermore, the automotive, electrical, telecommunications, electronics, and machinery industries are increasingly demanding higher-performance products. The rapid development of these industries has accelerated the advancement of high-performance engineering plastics, giving them an increasingly important role.

[0003] In the prior art, when preparing modified PET engineering plastics, the raw materials need to be stirred and mixed. In the existing mixer, the rotation of the stirring blade is controlled to stir the raw materials and mix the raw materials together. However, during the mixing, the fixed-form raw materials are mixed with the liquid, which easily causes some solid raw materials to clump and float on the top, resulting in prolonged stirring time and limited mixing uniformity, thereby affecting the quality of the modified PET engineering plastics. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a process for preparing modified PET engineering plastics, which solves the problems mentioned in the above background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A process for preparing modified PET engineering plastics comprises the following steps:

[0007] S1. Weighing raw materials: Weigh PET slices, nano-silica, magnesium borate whiskers, coupling agent, antioxidant, and lubricant separately for later use;

[0008] S2, raw material mixing: the raw materials in S1 are put into a mixer for mixing and processing to obtain a mixed material;

[0009] S3, melt extrusion: feeding the mixed material in step S2 into a twin-screw extruder for melt blending and extrusion, stranding, water cooling, pelletizing, and drying to obtain a finished product;

[0010] Wherein, the mixer includes a mixing tank, a plurality of support frames are fixedly connected to the outside of the mixing tank, a discharge pipe is fixedly connected to the lower side of the mixing tank, a valve is provided on the outside of the discharge pipe, a cover plate is fixedly connected to the upper side of the mixing tank, two feed pipes and a motor are fixedly connected to the upper side of the cover plate, an insulation shell is fixedly connected to the outside of the mixing tank, a heating wire is provided on the inner side of the insulation shell, and a mixing unit is provided on the lower side of the cover plate;

[0011] The mixing unit includes a control rod, which is rotatably connected to the lower side of the cover plate, and a plurality of stirring rods are fixedly connected to the outer side of the lower end of the control rod, and two branch cylinders are fixedly connected to the lower side of the cover plate, and a funnel is fixedly connected to the lower side of the two branch cylinders, and a discharge pipe is fixedly connected to the lower side of the left and right ends of the funnel, and the upper sides of the left and right bottom blocks are rotatably connected to a rotating rod, the upper end of the rotating rod passes through the funnel and is fixedly connected to a dispersion plate 1 and a gear part 1 on the outer side, and a fixing frame and a dispersion plate 2 are fixedly connected to the outer side of the control rod and located on the inner side of the funnel, and a gear ring is fixedly connected to the outer side of the fixing frame, and the dispersion plate 2 is located below the fixing frame.

[0012] Preferably, a fixed plate is fixedly connected to the outside of the control rod and to the bottom of the discharge pipe, a telescopic rod is fixedly connected to the upper side of the fixed plate, the upper end of the telescopic rod is fixedly connected to a movable ring, the left and right sides of the movable ring are fixedly connected to fixed plates, the outer sides of the left and right sides of the fixed plates are rotatably connected to a rotating shaft 1, the outer end of the rotating shaft 1 is fixedly connected to a fixed rod, a plurality of branch rods are fixedly connected to the outer side of the fixed rod, and the outer ends of the branch rods are fixedly connected to a flapping plate.

[0013] Preferably, a sliding groove is provided on the upper side of the fixed plate, and a sliding block is slidably connected to the inner side of the sliding groove. The upper side of the sliding block is fixedly connected to a vertical plate, and a rotating block 1 and a resisting block are fixedly connected to the side of the vertical plate close to the discharge pipe. The outer side of the rotating block 1 is rotatably connected to the rotating plate, and a guide groove is provided on the outer side of the discharge pipe, and a guide block is slidably connected to the inner side of the guide groove. The outer side of the guide block is fixedly connected to a swivel, and the outer side of the swivel is fixedly connected to a swivel block 2, and the swivel block 2 is rotatably connected to the rotating plate, and the resisting block is located above the swivel block 1, and a plurality of protrusions are fixedly connected to the outer side of the discharge pipe, and the resisting block resists the protrusions.

[0014] Preferably, a spring is fixedly connected between the outer side of the slider and the inner wall of the sliding groove.

[0015] Preferably, the guide groove is arranged in a circular ring structure.

[0016] Preferably, the movable ring is slidably connected to the control rod.

[0017] Preferably, the outer side of the rotating shaft 1 is fixedly connected with bevel gear 1, the outer side of the bevel gear 1 is meshedly connected with bevel gear 2, the front side of the vertical plate is fixedly connected with L-shaped block 1, the lower side of the L-shaped block 1 is fixedly connected with a toothed plate, the outer side of the bevel gear 2 is fixedly connected with rotating shaft 2, the front side of the fixed plate is fixedly connected with L-shaped block 2, the L-shaped block 2 is rotatably connected to the rotating shaft 2, and the front end of the rotating shaft 2 is fixedly connected with gear part 2.

[0018] Preferably, the second gear member is meshingly connected to the tooth plate.

[0019] Preferably, the gear ring is meshingly connected to the gear member.

[0020] Preferably, the lower end of the control rod passes through the outside of the funnel and the lower side of the discharge pipe.

[0021] Beneficial effects

[0022] The present invention provides a process for preparing modified PET engineering plastics. Compared with the prior art, it has the following advantages:

[0023] (1) The modified PET engineering plastic preparation process facilitates the feeding of raw materials into the mixing tank through the mixing tank, the control rod, the feed pipe, the branch cylinder, the funnel, the discharge pipe, the dispersion plate 1, the dispersion plate 2 and the gear ring, disperses the raw materials through the dispersion plate 1 and the dispersion plate 2 to avoid the raw materials from agglomerating, and mixes the raw materials through the stirring rod to improve the raw materials mixing effect.

[0024] (2) The modified PET engineering plastic preparation process uses a control rod, a discharge pipe, a guide groove, a guide block, a rotating ring, a rotating plate, a fixed plate, a stop block, a convex block, a movable ring, a fixed rod and a flapping plate to conveniently control the flapping plate on the fixed rod to move up and down repeatedly, thereby facilitating flapping of the floating raw materials and improving the mixing effect of the raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is the overall three-dimensional structural diagram of the present invention;

[0026] Figure 2 It is a sectional three-dimensional structural diagram of the present invention;

[0027] Figure 3 It is an internal three-dimensional structural diagram of the present invention;

[0028] Figure 4 It is a partially cutaway perspective structural diagram of the mixing unit of the present invention;

[0029] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0030] Figure 6It is a partial three-dimensional structural diagram of the mixing unit in the present invention;

[0031] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0032] Figure 8 It is a three-dimensional structural diagram of the flapping board in the present invention;

[0033] Figure 9 for Figure 8 Enlarged view of point C in the middle.

[0034] In the figure: 1, mixing tank; 2, support frame; 3, discharge pipe; 4, valve; 5, cover plate; 6, feed pipe; 7, motor; 8, mixing unit; 801, control rod; 802, stirring rod; 803, branch cylinder; 804, funnel; 805, bottom block; 806, discharge pipe; 807, rotating rod; 808, dispersion plate 1; 809, gear part 1; 810, dispersion plate 2; 811, fixed frame; 812, gear ring; 813, fixed plate; 814, telescopic rod; 815, moving ring; 816, fixed plate; 817, slide; 8 18. Slider; 819. Vertical plate; 820. Rotating block 1; 821. Rotating plate; 822. Guide groove; 823. Guide block; 824. Rotating ring; 825. Rotating block 2; 826. Stop block; 827. Protrusion; 828. Spring; 829. Rotating shaft 1; 830. Fixed rod; 831. Branch rod; 832. Flapping plate; 833. Bevel gear 1; 834. Bevel gear 2; 835. L-shaped block 1; 836. Tooth plate; 837. L-shaped block 2; 838. Rotating shaft 2; 839. Gear part 2; 9. Insulation shell; 10. Heating wire. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] Example 1:

[0037] See also Figure 1 - Figure 5 The present invention provides the following technical solution: a process for preparing modified PET engineering plastics, comprising the following steps:

[0038] S1. Weighing raw materials: Weigh PET slices, nano-silica, magnesium borate whiskers, coupling agent, antioxidant, and lubricant separately for later use;

[0039] S2, raw material mixing: the raw materials in S1 are put into a mixer for mixing and processing to obtain a mixed material;

[0040] S3, melt extrusion: the mixed material in step S2 is fed into a twin-screw extruder for melt blending and extrusion, stranding, water cooling, pelletizing, and drying to obtain a finished product.

[0041] Among them, the mixer includes a mixing tank 1, the outer side of the mixing tank 1 is fixedly connected to multiple support frames 2, the lower side of the mixing tank 1 is fixedly connected to a discharge pipe 3, the outer side of the discharge pipe 3 is provided with a valve 4, the upper side of the mixing tank 1 is fixedly connected to a cover plate 5, the upper side of the cover plate 5 is fixedly connected to two feed pipes 6 and a motor 7, the outer side of the mixing tank 1 is fixedly connected to an insulation shell 9, the inner side of the insulation shell 9 is provided with a heating wire 10, the lower side of the cover plate 5 is provided with a mixing unit 8, and the heating wire 10 in the insulation shell 9 heats the raw materials in the mixing tank 1.

[0042] The mixing unit 8 includes a control rod 801, which is rotatably connected to the lower side of the cover plate 5. A plurality of stirring rods 802 are fixedly connected to the outer side of the lower end of the control rod 801. Two branch cylinders 803 are fixedly connected to the lower side of the cover plate 5. A funnel 804 is fixedly connected to the lower side of the two branch cylinders 803. A discharge pipe 806 is fixedly connected to the lower side of the funnel 804. The lower sides of the left and right ends of the funnel 804 are fixedly connected to bottom blocks 805. The bottom blocks 805 on the left and right sides are fixedly connected to the bottom blocks 806 on the left and right sides. 5 are rotatably connected to the upper side of the rotating rod 807, the upper end of the rotating rod 807 passes through the funnel 804 and is fixedly connected to the outer side of the dispersion plate 1 808 and the gear member 1 809, the outer side of the control rod 801 and the inner side of the funnel 804 are fixedly connected to the fixing frame 811 and the dispersion plate 2 810, the outer side of the fixing frame 811 is fixedly connected to the gear ring 812, the dispersion plate 2 810 is located below the fixing frame 811, and the gear ring 812 is meshed with the gear member 1 809 When in use, the raw materials are put into the mixing tank 1 through the two feeding pipes 6, and the motor 7 is started. The motor 7 drives the control rod 801, and the control rod 801 drives the stirring rod 802 to rotate, so as to facilitate the stirring and mixing of the input raw materials. First, the raw materials enter the branch cylinder 803, and the control rod 801 drives the fixed frame 811 to rotate, and the fixed frame 811 drives the gear ring 812 to rotate, and the gear ring 812 drives the gear part 1 809 to rotate, and the gear part 1 809 drives the rotating rod 807 to rotate, and the rotating rod 807 drives the dispersion plate 1 808 to rotate, so that the dispersion plate 1 808 disperses the raw materials to avoid agglomeration of the raw materials. Then the raw materials are put into the funnel 804, so that the raw materials enter the funnel 804, and the control rod 801 drives the dispersion plate 2 810 to rotate, and the dispersion plate 2 810 preliminarily mixes the raw materials, and then the raw materials are discharged through the discharge pipe 806, and the raw materials are mixed again through the stirring rod 802 at the bottom to increase the mixing uniformity.

[0043] Example 2:

[0044] Based on the first embodiment, Figure 6 - Figure 7 As shown, a fixed plate 813 is fixedly connected to the outside of the control rod 801 and to the bottom of the discharge pipe 806. A telescopic rod 814 is fixedly connected to the upper side of the fixed plate 813. The upper end of the telescopic rod 814 is fixedly connected to a moving ring 815. The left and right sides of the moving ring 815 are fixedly connected to fixed plates 816. The outer sides of the left and right fixed plates 816 are rotatably connected to a rotating shaft 829. The outer end of the rotating shaft 829 is fixedly connected to a fixed rod 830. The outer side of the fixed rod 830 is fixedly connected to a plurality of branch rods 831. The outer end of the branch rod 831 is fixedly connected to a slapping plate 832. The fixed plate A slide groove 817 is provided on the upper side of 816, and a slider 818 is slidably connected to the inner side of the slide groove 817. A vertical plate 819 is fixedly connected to the upper side of the slider 818. A rotating block 820 and a stop block 826 are fixedly connected to the side of the vertical plate 819 close to the discharge pipe 806. The outer side of the rotating block 820 is rotatably connected to the rotating plate 821. A guide groove 822 is provided on the outer side of the discharge pipe 806. A guide block 823 is slidably connected to the inner side of the guide groove 822. A swivel ring 824 is fixedly connected to the outer side of the guide block 823. A swivel block 825 is fixedly connected to the outer side of the swivel ring 824. The swivel block 825 and the rotating plate 821 are fixedly connected. 1 is rotatably connected, the stop block 826 is located above the rotating block 820, and a plurality of protrusions 827 are fixedly connected to the outer side of the discharge pipe 806. The stop block 826 and the protrusion 827 are abutted against each other. A spring 828 is fixedly connected between the outer side of the slider 818 and the inner wall of the slide groove 817. The guide groove 822 is a circular ring structure. The moving ring 815 is slidably connected to the control rod 801. The control rod 801 drives the moving ring 815 to rotate, and the moving ring 815 drives the fixed plate 816 to rotate. The fixed plate 816 drives the fixed rod 830 to rotate, and the fixed rod 830 drives the slapping plate 832 on the branch rod 831 to rotate. The flapping plate 832 drives the raw materials to stir, and at the same time the fixed plate 816 drives the vertical plate 819 to rotate, and the vertical plate 819 drives the resistance block 826 to rotate. Since the resistance block 826 is in contact with the protrusion 827, the resistance block 826 drives the vertical plate 819 to move horizontally, and the vertical plate 819 drives the slider 818 to move horizontally, and the vertical plate 819 drives the rotating plate 821 to rotate, and the vertical plate 819 drives the movable ring 815 on the fixed plate 816 to move up and down, and the fixed plate 816 drives the flapping plate 832 to move up and down repeatedly, so that the flapping plate 832 flaps and disperses the floating raw materials to prevent the raw materials from clumping and affecting the mixing effect.

[0045] Example 3:

[0046] On the basis of Example 1, Figure 8 - Figure 9As shown, the outer side of the rotating shaft 829 is fixedly connected with the bevel gear 1 833, and the outer side of the bevel gear 1 833 is meshed with the bevel gear 2 834. The front side of the vertical plate 819 is fixedly connected with the L-shaped block 1 835, and the lower side of the L-shaped block 1 835 is fixedly connected with the tooth plate 836. The outer side of the bevel gear 2 834 is fixedly connected with the rotating shaft 2 838. The front side of the fixed plate 816 is fixedly connected with the L-shaped block 2 837. The L-shaped block 2 837 is rotatably connected to the rotating shaft 2 838. The front end of the rotating shaft 2 838 is fixedly connected with the gear part 2 839, and the gear part 2 839 is meshed with the tooth plate 836. The lower end of the control rod 801 passes through the outer side of the funnel 804 and is connected to the On the lower side of the discharge pipe 806, when the raw materials are stirred, the vertical plate 819 moves repeatedly left and right, and the vertical plate 819 drives the L-shaped block 1 835 to drive the tooth plate 836 to move left and right, and the tooth plate 836 drives the gear part 2 839 to rotate, and the gear part 2 839 drives the rotating shaft 2 838 to rotate, and the rotating shaft 2 838 drives the bevel gear 2 834 to rotate, and the bevel gear 2 834 drives the bevel gear 1 833 to rotate, and the bevel gear 1 833 drives the rotating shaft 1 829 to rotate, and the rotating shaft 1 829 drives the fixed rod 830 to rotate, and the fixed rod 830 drives the slapping plate 832 on the branch rod 831 to rotate, so that the slapping plate 832 stirs the raw materials, thereby increasing the raw material mixing effect.

[0047] Working principle: When in use, the staff first prepares the raw materials, puts the raw materials into the mixing tank 1 through the feed pipe 6, and the raw materials enter the branch cylinder 803, starts the motor 7, and the motor 7 drives the control rod 801 to rotate. Under the action of the gear ring 812 and the gear part 1 809, the dispersion plate 1 808 and the dispersion plate 2 810 are controlled to rotate, so that the dispersion plate 1 808 disperses the single raw material, and the raw material enters the funnel 804, so that the dispersion plate 2 810 performs preliminary mixing on the raw material, and then the raw material enters the bottom of the mixing tank 1 through the discharge pipe 806. The control rod 801 drives the stirring rod 802 to rotate. The stirring rod 802 is used to mix the raw materials again, and at the same time, the control rod 801 drives the slapping plate 832 on the fixed rod 830 to rotate to stir the raw materials. Under the action of the vertical plate 819, the stop block 826, the rotating plate 821 and the protrusion 827, it is convenient to control the slapping plate 832 to move up and down repeatedly, so that the slapping plate 832 can break up the raw materials floating on the top to avoid agglomeration of the raw materials. At the same time, under the action of the rotating shaft 1 829, the bevel gear 1 833, the bevel gear 2 834, the rotating shaft 2 838, the gear part 2 839 and the tooth plate 836, it is convenient to control the slapping plate 832 to rotate and increase the mixing uniformity.

[0048] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A process for preparing modified PET engineering plastics, characterized in that: The following steps are involved: S1. Weighing raw materials: Weigh PET slices, nano-silica, magnesium borate whiskers, coupling agent, antioxidant, and lubricant separately for later use; S2, raw material mixing: the raw materials in S1 are put into a mixer for mixing and processing to obtain a mixed material; S3, melt extrusion: feeding the mixed material in step S2 into a twin-screw extruder for melt blending and extrusion, stranding, water cooling, pelletizing, and drying to obtain a finished product; The mixer comprises a mixing tank (1), a plurality of support frames (2) are fixedly connected to the outside of the mixing tank (1), a discharge pipe (3) is fixedly connected to the bottom of the mixing tank (1), a valve (4) is provided on the outside of the discharge pipe (3), a cover plate (5) is fixedly connected to the top of the mixing tank (1), two feed pipes (6) and a motor (7) are fixedly connected to the top of the cover plate (5), a heat-insulating outer shell (9) is fixedly connected to the outside of the mixing tank (1), a heating wire (10) is provided on the inside of the heat-insulating outer shell (9), and a mixing unit (8) is provided on the bottom of the cover plate (5); The mixing unit (8) includes a control rod (801), the control rod (801) is rotatably connected to the lower side of the cover plate (5), a plurality of stirring rods (802) are fixedly connected to the outer side of the lower end of the control rod (801), two branch cylinders (803) are fixedly connected to the lower side of the cover plate (5), a funnel (804) is fixedly connected to the lower side of the two branch cylinders (803), a discharge pipe (806) is fixedly connected to the lower side of the funnel (804), and the lower sides of the left and right ends of the funnel (804) are fixedly connected to the bottom block (80 5), the upper sides of the bottom blocks (805) on the left and right sides are rotatably connected to rotating rods (807), the upper ends of the rotating rods (807) pass through the funnel (804) and are fixedly connected to a dispersion plate (808) and a gear member (809) on the outside, the outside of the control rod (801) and located on the inside of the funnel (804) are fixedly connected to a fixing frame (811) and a dispersion plate (810), the outside of the fixing frame (811) is fixedly connected to a gear ring (812), and the dispersion plate (810) is located below the fixing frame (811).

2. A process for preparing modified PET engineering plastics according to claim 1, characterized in that: A fixed plate (813) is fixedly connected to the outside of the control rod (801) and below the discharge pipe (806); a telescopic rod (814) is fixedly connected to the upper side of the fixed plate (813); a moving ring (815) is fixedly connected to the upper end of the telescopic rod (814); a fixed plate (816) is fixedly connected to the left and right sides of the moving ring (815); a rotating shaft (829) is rotatably connected to the outer sides of the fixed plates (816) on the left and right sides; a fixed rod (830) is fixedly connected to the outer end of the rotating shaft (829); a plurality of branch rods (831) are fixedly connected to the outer side of the fixed rod (830); and a flapping plate (832) is fixedly connected to the outer end of the branch rod (831).

3. A process for preparing modified PET engineering plastics according to claim 2, characterized in that: A sliding groove (817) is provided on the upper side of the fixed plate (816), a slider (818) is slidably connected to the inner side of the sliding groove (817), a vertical plate (819) is fixedly connected to the upper side of the slider (818), a rotating block (820) and a stop block (826) are fixedly connected to the side of the vertical plate (819) close to the discharge pipe (806), a rotating plate (821) is rotatably connected to the outer side of the rotating block (820), and a guide groove (822) is provided on the outer side of the discharge pipe (806). The inner side of the guide groove (822) is slidably connected to a guide block (823), the outer side of the guide block (823) is fixedly connected to a rotating ring (824), the outer side of the rotating ring (824) is fixedly connected to a second rotating block (825), the second rotating block (825) is rotatably connected to the rotating plate (821), the abutting block (826) is located above the first rotating block (820), the outer side of the discharge pipe (806) is fixedly connected to a plurality of protrusions (827), and the abutting block (826) abuts against the protrusions (827).

4. A process for preparing modified PET engineering plastics according to claim 3, characterized in that: A spring (828) is fixedly connected between the outer side of the slider (818) and the inner wall of the sliding groove (817).

5. A process for preparing modified PET engineering plastics according to claim 3, characterized in that: The guide groove (822) is arranged in a circular ring structure.

6. A process for preparing modified PET engineering plastics according to claim 2, characterized in that: The movable ring (815) is slidably connected to the control rod (801).

7. The process for preparing modified PET engineering plastics according to claim 3, wherein: The outer side of the rotating shaft 1 (829) is fixedly connected to a bevel gear 1 (833), and the outer side of the bevel gear 1 (833) is meshedly connected to a bevel gear 2 (834). The front side of the vertical plate (819) is fixedly connected to an L-shaped block 1 (835), and the lower side of the L-shaped block 1 (835) is fixedly connected to a toothed plate (836). The outer side of the bevel gear 2 (834) is fixedly connected to the rotating shaft 2 (838). The front side of the fixed plate (816) is fixedly connected to the L-shaped block 2 (837), and the L-shaped block 2 (837) is rotatably connected to the rotating shaft 2 (838). The front end of the rotating shaft 2 (838) is fixedly connected to the gear part 2 (839).

8. The process for preparing modified PET engineering plastics according to claim 7, wherein: The second gear member (839) is meshedly connected with the tooth plate (836).

9. The process for preparing modified PET engineering plastics according to claim 1, wherein: The gear ring (812) is meshedly connected with the gear member 1 (809).

10. The process for preparing modified PET engineering plastics according to claim 1, wherein: The lower end of the control rod (801) passes through the outside of the funnel (804) and the lower side of the discharge pipe (806).

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