CN213796740U - Rotary disc cutting mechanism for cutting plastic profiles - Google Patents

Abstract

The utility model discloses a carousel cutting mechanism is used in plastic material cutting, including the lift jar chassis, the lifting disk, cutting assembly installation carousel, two lift jar chassis parallel arrangement, all install carousel lift jar on two lift jar chassis, the lifting disk is installed on two carousel lift jars, install the carousel bearing on the lifting disk up end, cutting assembly installation carousel passes through the carousel bearing and rotates and install on the lifting disk, install cutting assembly on the cutting assembly installation carousel, angle positioning assembly is installed to the lifting disk lower extreme, angle positioning assembly can fix a position the rotation angle of cutting assembly installation carousel, the utility model discloses a cutting disk angularly adjustable can cut off the section bar into different angle grooves, satisfies the oblique angle cutting demand of section bar.

Description

Rotary disc cutting mechanism for cutting plastic profiles

Technical Field

The utility model belongs to the technical field of section bar processing equipment technique and specifically relates to a carousel cutting mechanism is used in cutting of plastic material.

Background

The plastic is a high molecular compound which is polymerized by addition polymerization or polycondensation reaction and has moderate deformation resistance, is arranged between fiber and rubber, and consists of synthetic resin, filler, plasticizer, stabilizer, lubricant, pigment and other additives, the plastic is widely applied to the aspects of daily life of people, most of door and window frame materials used by people are made of plastic, when the door and window frame is made of the plastic, the plastic is firstly made into a section bar of the door and window frame and then assembled, the plastic section bar is generally formed by extrusion molding, the section bar is continuously extruded in the extrusion process, therefore, the length of the section bar is usually longer, the finished product can be formed only after the section bar is cut, the section bar is generally cut by semi-manual operation at present, the error of the length of the section bar is larger, the inconvenience is brought to subsequent assembly, and the production efficiency of the cutting mode is not high, is only suitable for small workshops and can not meet the requirement of mass production of factories.

The section bar needs the butt joint when making up into door and window, and the butt joint department in the corner position needs to have the contained angle, therefore some section bars that are used for the corner concatenation need have the bevel connection face, and how to realize the bevel connection of section bar is a difficult problem.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned prior art not enough, provide a carousel cutting mechanism is used in plastic material cutting.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a rotary disc cutting mechanism for cutting plastic profiles comprises lifting cylinder bottom frames, lifting discs, a cutting assembly mounting rotary disc and two lifting cylinder bottom frames which are arranged in parallel, wherein rotary disc lifting cylinders are mounted on the two lifting cylinder bottom frames, the rotary disc lifting cylinders are vertically upwards mounted, the lifting discs are mounted on the two rotary disc lifting cylinders, rotary disc bearings are mounted on the upper end surfaces of the lifting discs, the cutting assembly mounting rotary disc is rotatably mounted on the lifting discs through the rotary disc bearings, the cutting assembly is mounted on the cutting assembly mounting rotary disc and comprises a cutting disc mounting frame, a cutting disc rotating shaft and a second motor, the cutting disc mounting frame is fixedly mounted on the cutting assembly mounting rotary disc, the cutting disc rotating shaft is rotatably connected onto the cutting disc mounting frame, the cutting disc is fixedly mounted on the cutting disc rotating shaft, and the second motor is fixedly mounted on the cutting assembly mounting rotary disc, the cutting assembly mounting turntable is characterized in that the second motor output shaft is in transmission connection with a cutting disc rotating shaft, a cutting knife groove is formed in the cutting assembly mounting turntable, the lower end of the cutting disc falls into the cutting knife groove, a plurality of angle positioning holes are formed in the cutting assembly mounting turntable and are uniformly distributed on a circumference locus line which takes the center of the cutting assembly mounting turntable as the circle center, an angle pointer is connected to the side face of the cutting assembly mounting turntable, a circle of matched scale ring is carved on the lifting disc, an angle positioning assembly is mounted at the lower end of the lifting disc, and the angle positioning assembly can position the rotating angle of the cutting assembly mounting turntable.

The angle positioning assembly comprises a positioning box, a piston, a spring and a positioning bolt, wherein the positioning box is fixedly arranged on the lower end face of the lifting disc, the piston and the spring are arranged in the positioning box, the upper end of the spring is abutted to the lower end of the piston, the lower end of the spring is connected with the bottom of an inner hole of the positioning box, the positioning bolt is vertically connected to the piston, the upper end of the positioning bolt penetrates through the lifting disc to extend upwards, a pair of thrust rods are symmetrically connected to the side wall of the piston, two L-shaped motion grooves symmetrically arranged are formed in the outer wall of the positioning box, and the thrust rods move in the L-shaped motion grooves.

The utility model has the advantages that: the utility model discloses a cutting disc angularly adjustable can cut off the section bar into different angle grooves, satisfies the oblique angle cutting demand of section bar.

Drawings

Fig. 1 is a top view of a transmission cutting device for plastic profiles, to which the present invention is applied;

fig. 2 is a transmission structure diagram of a driving wheel set of a transmission cutting device for plastic profiles, which is applied in the present invention;

fig. 3 is a side view of the installation of the driving wheel set of the driving cutting device for plastic profiles, which is applied in the present invention;

fig. 4 is a schematic structural diagram of a feeding position correcting assembly of a plastic profile transmission cutting device applied in the present invention;

FIG. 5 is a sectional view taken along line A in FIG. 1;

fig. 6 is a top view structural diagram of a diagonal pressing component of a plastic profile transmission cutting device applied by the invention;

FIG. 7 is a sectional view taken along line B of FIG. 1;

FIG. 8 is a cross-sectional view taken along line C of FIG. 1;

FIG. 9 is a top view of the structure of the present invention;

FIG. 10 is a side cross-sectional block diagram of the present invention;

fig. 11 is a schematic structural diagram of the angle positioning assembly of the present invention.

In the figure: the device comprises a frame platform 1, a clamping frame moving rail 11, a blanking groove 12, a blanking channel 13, a friction fixing area 14, a transmission mechanism 2, a driving wheel group 21, a power wheel 211, a transmission wheel group 22, a first motor 23, a feeding position rectifying assembly 3, a position rectifying seat 31, a position rectifying screw mounting plate 32, a position rectifying screw 33, a position rectifying hand wheel 34, a position rectifying thrust plate 35, a position rectifying wheel mounting plate 36, a position rectifying wheel 37, a fixing clamping device 4, a fixing clamping frame 41, a connecting rod moving groove 411, a connecting rod mounting plate 412, a clamping mechanism 42, a profile platform 421, a clamping seat sliding rail 422, a clamping sliding seat 423, a flat pressing plate 4231, a clamping driving assembly 424, a first connecting rod 4241, a second connecting rod 4242, a clamping driving cylinder 4243, a centering guide rod 4244, a centering guide sleeve 4245, a third connecting rod 4246, a fourth connecting rod 4247, an inclined pressing assembly 425, an inclined pressing seat 4251, an inclined pressing rotating shaft 4252, an inclined pressing plate 4253, an inclined pressing plate 4254 and an inclined pressing driving connecting plate 4254, The device comprises a diagonal pressing cylinder mounting seat 4255, a diagonal pressing cylinder 4256, a turntable cutting mechanism 5, a lifting cylinder chassis 51, a turntable lifting cylinder 52, a lifting disc 53, a graduated ring 531, a turntable bearing 54, a cutting assembly mounting turntable 55, a cutting knife groove 551, an angle positioning hole 552, an angle pointer 553, a cutting assembly 56, a cutting disc mounting frame 561, a cutting disc rotating shaft 562, a cutting disc 563, a second motor 564, an angle positioning assembly 57, a positioning box 571, a piston 572, a spring 573, a positioning bolt 574, a thrust rod 575, an L-shaped moving groove 576, a moving clamping mechanism 6, a moving clamping frame 61, a sliding block 611, a sensing assembly 62, a sensing plate 621, a sensing area 622, a piston rod moving hole 623, a blanking assembly 63, a blanking cylinder 631, a material pushing head 632, a material discharging slope 64, a clamping frame fixing assembly 65, a fixing screw 651, a friction surface 652 and a positioning driving hand wheel 653.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments, wherein the descriptions of "left", "right", etc. in the present invention all refer to fig. 1 as the reference direction:

as shown in fig. 1 to 11, a plastic profile transmission cutting device comprises a rack platform 1 and a transmission mechanism 2, wherein the transmission mechanism 2 comprises a driving wheel set 21 and a plurality of transmission wheel sets 22, the driving wheel set 21 and the transmission wheel sets 22 are arranged on the rack platform 1 along a straight line, the transmission mechanism 2 is used for conveying profile raw materials, the profile raw materials are driven by the transmission mechanism 2 to advance and feed to form a profile raw material conveying route, the rack platform 1 is sequentially provided with a feeding position correcting component 3, a fixed clamping device 4, a rotary disc cutting mechanism 5 and a movable clamping mechanism 6 along the profile raw material conveying route, the feeding position correcting component 3 is used for conveying and correcting the profile raw materials so as to accurately fall in the subsequent direction, the fixed clamping device 4 and the movable clamping mechanism 6 are used for clamping and fixing the profile raw materials, the rotary disc cutting mechanism 5 is used for cutting to form a profile with equal length, parallel arrangement installs two supporting frame and removes rail 11 on frame platform 1, remove 6 slidable mounting of fixture on two supporting frame and remove rail 11, through the back-and-forth movement of removing fixture 6, adjust the unloading length of section bar, satisfy the cutting demand of different length section bars, charging chute 12 has been seted up on frame platform 1, charging chute 12 is located 4 back tracks of fixed clamping device, cover the displacement range who removes fixture 6, thus, the section bar under the cutting just can be collected through charging chute 12 whereabouts, 1 below fixed mounting of frame platform has unloading passageway 13, unloading passageway 13 is located under charging chute 12, the finished product section bar of whereabouts passes through unloading passageway 13 output and collects, carousel cutting mechanism 5 spanes on charging chute 12.

The driving wheel set 21 and the transmission wheel set 22 are formed by connecting a plurality of power wheels 211 in series, the transmission mechanism 2 further comprises a first motor 23, the first motor 23 is in transmission connection with the driving wheel set 21, the first motor 23 drives the driving wheel set 21 to rotate to drive the section material to advance, and the transmission wheel set 22 plays a role in transmission.

The two feeding position correcting components 3 are symmetrically arranged on two sides of a section bar raw material conveying path, each feeding position correcting component 3 comprises a position correcting seat 31, a position correcting screw rod mounting plate 32, a position correcting thrust plate 35 and a position correcting wheel mounting plate 36, the position correcting seats 31 are fixedly mounted on the frame platform 1, the position correcting screw rod mounting plates 32 are vertically connected to the position correcting seats 31, the position correcting screw rods 33 are arranged on the position correcting screw rod mounting plates 32 in a threaded penetrating mode, one ends of the position correcting screw rods 33 are fixedly connected with position correcting hand wheels 34, the other ends of the position correcting screw rods are rotatably connected to the position correcting thrust plates 35, the position correcting wheel mounting plates 36 are horizontally connected to the position correcting thrust plates 35, the position correcting wheels 37 are rotatably mounted on the position correcting wheel mounting plates 36, the position correcting wheels 37 of the two feeding position correcting components 3 are oppositely mounted, the position correcting hand wheels 34 can drive the position correcting screw rods 33 to move by screwing, so that the position correcting thrust plates 35 are driven to move, and the distance between the two position correcting wheels 37 is changed, the position correction requirement of the profile raw material with different widths is met.

The fixed clamping device 4 comprises a fixed clamping frame 41 and a clamping mechanism 42, the fixed clamping frame 41 is fixedly arranged on the rack platform 1, the clamping mechanism 42 comprises a section bar platform 421 and clamping sliding seats 423, the section bar platform 421 is fixedly arranged at the central position of the upper end of the fixed clamping frame 41, the end surface of the section bar platform 421 needs to be smooth, the forward conveying of the section bar raw material is convenient, in order to ensure that the section bar raw material cannot be blocked due to different heights in the conveying process, the height of the end surface of the section bar platform 421 is consistent with the height of the highest point of the power wheel 211, two clamping seat sliding rails 422 which are arranged in parallel are arranged at two sides of the section bar platform 421, the two clamping sliding seats 423 are respectively and symmetrically arranged at two sides of the section bar platform 421, the two clamping sliding seats 423 are arranged on the clamping seat sliding rails 422 in a sliding manner, flat pressing plates 4231 are arranged on the two clamping sliding seats 423, and the two clamping sliding seats 423 are driven to move by a clamping driving assembly 424, inclined pressing assemblies 425 are installed on the two clamping sliding seats 423, the flat pressing plate 4231 plays a role in clamping the lower half portion of the side face of the section material, the inclined pressing assemblies 425 play a role in clamping the upper half portion of the side face of the section material, inclined chamfer angles exist in some section materials, the inclined pressing assemblies 425 can be effectively clamped on the inclined faces, and stable clamping of the section material is guaranteed.

The clamping driving assembly 424 comprises two first connecting rods 4241, two second connecting rods 4242, a centering guide rod 4244, two third connecting rods 4246 and two fourth connecting rods 4247, one end of each of the two first connecting rods 4241 is hinged with the two clamping sliding seats 423 respectively, the other end of each of the two first connecting rods 4241 is rotatably connected with the upper end parts of the two second connecting rods 4242 respectively, a connecting rod moving groove 411 is formed in the fixed clamping frame 41, the first connecting rod 4241 moves in the connecting rod moving groove 411, a connecting rod mounting plate 412 is connected below the upper end surface of the rack platform 1, the middle parts of the second connecting rods 4242 are rotatably connected to the connecting rod mounting plate 412, a clamping driving cylinder 4243 is connected between the lower end parts of the two second connecting rods 4242, the centering guide rod 4244 is vertically connected below the fixed clamping frame 41, the centering guide rod 4244 is positioned right below the profile platform 421, a centering sleeve 4245 is slidably sleeved on the centering guide rod 4244, one end of each of two third connecting rods 4246 is fixedly connected with the side surface of each of two second connecting rods 4242, the other end of each of the two third connecting rods 4246 is rotatably connected with the lower end of each of two fourth connecting rods 4247, the upper end of each of the fourth connecting rods 4247 is hinged to the side wall of the centering guide sleeve 4245, the second connecting rods 4242 can be driven to rotate by stretching and retracting the clamping driving air cylinder 4243, so that the clamping slide 423 is driven to move through the first connecting rod 4241 to clamp the profile material, and the centering guide rod 4244, the centering guide sleeve 4245, the third connecting rod 4246 and the fourth connecting rod 4247 play a role in displacement centering of the two clamping slides 423 to ensure that the displacement amounts of the two clamping slides 423 are consistent, and because the lengths of the two third connecting rods 4246 are consistent, the rotation angles of the two second connecting rods 4242 are consistent by driving the centering guide sleeve 4245 to move up and down on the centering guide rod 4244, so that the centering function is realized.

The inclined pressing assembly 425 comprises an inclined pressing seat 4251, an inclined pressing rotating shaft 4252, an inclined pressing plate 4253, an inclined pressing cylinder mounting seat 4255 and an inclined pressing cylinder 4256, the inclined pressing seat 4251 is fixedly mounted on the upper end face of the clamping sliding seat 423, the inclined pressing rotating shaft 4252 is rotatably mounted on the inclined pressing seat 4251, the inclined pressing plate 4253 is fixedly connected to the inclined pressing rotating shaft 4252, the inclined pressing rotating shaft 4252 extends towards the outer side of the inclined pressing seat 4251 and is fixedly connected with an inclined pressing driving connecting plate 4254, the inclined pressing cylinder mounting seat 4255 is fixedly connected to the side wall of the clamping sliding seat 423, the mounting end of the inclined pressing cylinder 4256 is hinged to the inclined pressing cylinder mounting seat 4255, the piston rod end of the inclined pressing cylinder 4256 is connected with the inclined pressing driving connecting plate 4254, the inclined pressing driving connecting plate 4254 to rotate through the extension and retraction of the inclined pressing cylinder 4256, so that the inclined pressing plate 4253 presses the inclined pressing plate on the inclined face of the section bar raw material to meet the inclined face positioning requirement.

The rotary table cutting mechanism 5 comprises lifting cylinder bottom frames 51, lifting discs 53 and a cutting assembly mounting rotary table 55, wherein the two lifting cylinder bottom frames 51 are fixedly mounted on the frame platform 1 in parallel, rotary table lifting cylinders 52 are mounted on the two lifting cylinder bottom frames 51, the rotary table lifting cylinders 52 are vertically mounted upwards, the lifting discs 53 are mounted on the two rotary table lifting cylinders 52, when the rotary table lifting cylinders 52 extend out, cutting parts are separated from contact with section material raw materials, when the rotary table lifting cylinders 52 retract, the cutting parts descend to cut off the section material raw materials, rotary table bearings 54 are mounted on the upper end surfaces of the lifting discs 53, the cutting assembly mounting rotary table 55 is rotatably mounted on the lifting discs 53 through the rotary table bearings 54, cutting assemblies 56 are mounted on the cutting assembly mounting rotary table 55, the cutting assemblies 56 can be placed in an angle adjusting mode through rotation of the cutting assembly mounting rotary table 55, and cutting of slopes with different angles on the section materials is met, the cutting assembly 56 comprises a cutting disk mounting rack 561, a cutting disk rotating shaft 562 and a second motor 564, the cutting disk mounting rack 561 is fixedly installed on a cutting assembly mounting turntable 55, the cutting disk rotating shaft 562 is rotatably connected on the cutting disk mounting rack 561, a cutting disk 563 is fixedly installed on the cutting disk rotating shaft 562, the second motor 564 is fixedly installed on the cutting assembly mounting turntable 55, an output shaft of the second motor 564 is in transmission connection with the cutting disk rotating shaft 562, the second motor 564 drives the cutting disk 563 to rotate to cut the profile material, a cutting groove 551 is arranged on the cutting assembly mounting turntable 55, the lower end of the cutting disk 563 falls into the cutting groove 551, a plurality of angle positioning holes 552 are formed in the cutting assembly mounting turntable 55, the angle positioning holes 552 are uniformly distributed on a circumferential trace taking the center of the cutting assembly mounting turntable 55 as the circle center, an angle pointer 553 is connected to the side surface of the cutting assembly mounting turntable 55, be carved with the supporting scale ring 531 of round on the lifting disk 53, the graduation quantity is unanimous on the quantity of angle locating hole 552 and the scale ring 531, angle pointer 553 indicates which scale just represents which angle is put to cutting disk 563, angle locating component 57 is installed to lifting disk 53 lower extreme, angle locating component 57 can fix a position the rotation angle of cutting component installation carousel 55, before cutting, earlier manual rotation cutting component installation carousel 55 as required, with the angle of putting of adjustment cutting disk 563, angular adjustment targets in place the back, reuse angle locating component 57 locking angle, carry out the cutting operation again.

The angle positioning assembly 57 comprises a positioning box 571, a piston 572, a spring 573 and a positioning bolt 574, the positioning box 571 is fixedly mounted on the lower end face of the lifting disc 53, the piston 572 and the spring 573 are mounted in the positioning box 571, the upper end of the spring 573 abuts against the lower end of the piston 572, the lower end of the spring 573 is connected with the bottom of an inner hole of the positioning box 571, the positioning bolt 574 is vertically connected to the piston 572, the upper end of the positioning bolt 574 penetrates through the lifting disc 53 to extend upwards, a pair of thrust rods 575 are symmetrically connected to the side wall of the piston 572, two L-shaped motion slots 576 symmetrically arranged are formed in the outer wall of the positioning box 571, the thrust rods 575 move in the L-shaped motion slots 576, when the cutting assembly mounting dial 55 needs to rotate, the thrust rods 575 are pulled downwards first to drive the piston 572 to compress the spring 573, the thrust rods 575 are pulled downwards and rotate to fall into the lower transverse slots of the L-shaped motion slots 576, so that the descending state of the piston 572 can be maintained, at this time, the positioning pin 574 is disengaged from the angle positioning hole 552, the cutting component mounting turntable 55 can smoothly rotate, after the rotation adjustment is in place, the rotary thrust rod 575 is disengaged from the lower transverse groove of the L-shaped moving groove 576, at this time, the spring 573 returns to push the piston 572 to go upwards, the positioning pin 574 also moves upwards and falls into the angle positioning hole 552, so that the rotation of the cutting component mounting turntable 55 can be interfered, and the angle position of the cutting component mounting turntable 55 can be positioned.

The movable clamping mechanism 6 comprises a movable clamping frame 61, a blanking assembly 63 and a clamping frame fixing assembly 65, sliding blocks 611 are symmetrically arranged below the movable clamping frame 61, the sliding blocks 611 are matched with the clamping frame moving rail 11, the movable clamping frame 61 slides back and forth on the clamping frame moving rail 11 through the matching of the sliding blocks 611 and the clamping frame moving rail 11, a clamping mechanism 42 and a sensing assembly 62 are installed on the movable clamping frame 61, the profile material is clamped at two ends and cut in the middle mode during cutting operation, the clamping mechanism 42 on the movable clamping frame 61 plays a role in clamping and fixing the other end of the profile material, the sensing assembly 62 is installed behind the clamping mechanism 42, the profile material is conveyed through a transmission mechanism 2, when the profile material touches the sensing assembly 62, an in-place signal is given, the clamping mechanisms 42 on the fixed clamping device 4 and the movable clamping mechanism 6 simultaneously clamp the profile material, the induction component 62 comprises an induction plate 621, the induction plate 621 is vertically installed on the movable clamping frame 61, the induction plate 621 is provided with an induction area 622, the induction area 622 is used for outputting in-place signals, the blanking component 63 is installed on the induction plate 621, the blanking component 63 comprises a blanking cylinder 631, the blanking cylinder 631 is fixedly installed on the rear side of the induction plate 621, a piston rod of the blanking cylinder 631 is connected with a material pushing top 632, the induction plate 621 is provided with a piston rod moving hole 623, the material pushing top 632 is normally hidden in the piston rod moving hole 623, the material pushing top 632 is installed facing the advancing direction of the profile, after the profile is cut, one end is free, the other end is still on the profile platform 421, the material pushing top 632 is taken out through the extension of the blanking cylinder 631, the profile is pushed to fall, the profile platform 421 of the movable clamping mechanism 6 is connected with a material discharging slope 64, the material discharging slope 64 is matched with the blanking component 63, make the smooth whereabouts of section bar and collect, when the cutting length of adjustment section bar, need remove removal holding frame 61, after length adjustment, need fixed removal holding frame 61, the section bar of guaranteeing each unloading is all isometric, removes holding frame 61 and passes through the fixed subassembly 65 location of holding frame and fix.

Two clamping frame fixing components 65 are symmetrically arranged on a movable clamping frame 61, two friction fixing areas 14 which are arranged in parallel are arranged on a rack platform 1, each clamping frame fixing component 65 is arranged corresponding to one friction fixing area 14, each clamping frame fixing component 65 comprises a fixing screw 651, the fixing screw 651 is vertically and threadedly arranged on the movable clamping frame 61, the lower end of the fixing screw 651 is provided with a friction surface 652, the upper end of the fixing screw 651 is connected with a positioning driving hand wheel 653, the fixing screw 651 is arranged at a position right above the friction fixing area 14, when the movable clamping frame 61 needs to be moved, the positioning driving hand wheel 653 is screwed to drive the fixing screw 651 to ascend, so that the friction surface 652 is separated from the friction fixing area 14, when the position of the movable clamping frame 61 needs to be fixed, the positioning driving hand wheel 653 is screwed to drive the fixing screw 651 to descend, the friction surface is tightly attached to the friction fixing area 14, the position of the movable clamping frame 61 is locked through friction force, the operation is simple and clear, and the fixation is reliable.

Through the utility model discloses, can realize quick, isometric batch cutting of section bar, production efficiency is high, the steady quality.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims (2)

1. The utility model provides a carousel cutting mechanism is used in cutting of plastic material, includes lift cylinder chassis (51), lifting disk (53), cutting unit mount carousel (55), its characterized in that: the two lifting cylinder bottom frames (51) are arranged in parallel, two lifting cylinder bottom frames (51) are provided with turntable lifting cylinders (52), the turntable lifting cylinders (52) are vertically upwards installed, the lifting disc (53) is installed on the two turntable lifting cylinders (52), turntable bearings (54) are installed on the upper end face of the lifting disc (53), a cutting assembly installation turntable (55) is rotatably installed on the lifting disc (53) through the turntable bearings (54), a cutting assembly (56) is installed on the cutting assembly installation turntable (55), the cutting assembly (56) comprises a cutting disc installation rack (561), a cutting disc rotating shaft (562) and a second motor (564), the cutting disc installation rack (561) is fixedly installed on the cutting assembly installation turntable (55), and the cutting disc rotating shaft (562) is rotatably connected onto the cutting disc installation rack (561), a cutting disc (563) is fixedly mounted on the cutting disc rotating shaft (562), the second motor (564) is fixedly mounted on the cutting component mounting rotating disc (55), an output shaft of the second motor (564) is in transmission connection with the cutting disc rotating shaft (562), a cutting groove (551) is formed in the cutting component mounting rotating disc (55), the lower end of the cutting disc (563) falls into the cutting groove (551), a plurality of angle positioning holes (552) are formed in the cutting component mounting rotating disc (55), the angle positioning holes (552) are uniformly distributed on a circumferential track line which takes the center of the cutting component mounting rotating disc (55) as the circle center, an angle pointer (553) is connected to the side surface of the cutting component mounting rotating disc (55), a circle of matched scale ring (531) is carved on the lifting disc (53), and an angle positioning component (57) is mounted at the lower end of the lifting disc (53), the angle positioning component (57) can position the rotating angle of the cutting component mounting turntable (55).

2. The rotary disc cutting mechanism for cutting plastic profiles as claimed in claim 1, characterized in that: the angle positioning assembly (57) comprises a positioning box (571), a piston (572), a spring (573) and a positioning bolt (574), the positioning box (571) is fixedly installed on the lower end face of the lifting disc (53), the piston (572) and the spring (573) are installed in the positioning box (571), the upper end of the spring (573) abuts against the lower end of the piston (572), the lower end of the spring (573) is connected with the bottom of an inner hole of the positioning box (571), the positioning bolt (574) is vertically connected to the piston (572), the upper end of the positioning bolt (574) penetrates through the lifting disc (53) to extend upwards, a pair of thrust rods (575) are symmetrically connected to the side wall of the piston (572), two L-shaped motion grooves (576) which are symmetrically arranged are formed in the outer wall of the positioning box (571), and the thrust rods (575) move in the L-shaped motion grooves (576).

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