CN206154692U - Rotary traction device for film blowing machine - Google Patents

Abstract

The utility model provides a rotary traction device for film blowing machine, includes the extrusion die, and the extrusion die is equipped with ring shape and extrudes the mouth, and the top or the below of extrusion die are equipped with haulage clip roller, a horizontal anomalous movement deflector roll, the 2nd horizontal anomalous movement deflector roll, the 3rd horizontal anomalous movement deflector roll, fourth horizontal anomalous movement deflector roll, the fixed deflector roll of level, and the 2nd horizontal anomalous movement deflector roll can be installed on the second support horizontal slip, still is equipped with the screw mechanism of the 2nd horizontal anomalous movement deflector roll of drive for second support horizontal slip, fourth horizontal anomalous movement deflector roll can be installed on the fourth support horizontal slip, still is equipped with two screw mechanism of drive fourth horizontal anomalous movement deflector roll for fourth support horizontal slip. The utility model discloses can revise thin film position along the axle anagenesis of the fixed deflector roll of the level undulant skew of making a round trip, makes the film remain stable along the axial position of the fixed deflector roll of level.

Description

The rotary tractor of inflation film manufacturing machine

Technical field

The utility model is related to a kind of film blowing device for producing plastic sheeting, and in particular to a kind of rotation traction traction of inflation film manufacturing machine Device.

Background technology

When traditional inflation film manufacturing machine is produced, plastic raw materials are extruded after melting by the annular extrusion of die head, and become cylindric Film bubble, then drawing nip rolls and flattening film becomes bilayer film, and bilayer film bypasses horizontal stationary guide roller, finally set by winding It is standby to be wound, the central axis of the installation direction of horizontal stationary guide roller parallel to Scroll.

But, due to reasons such as Machine Design, frame for movement, machinings, squeeze from the annular extrusion of film blowing device The cylindric film bubble each point thickness for going out has difference in fact, and for example the bubble thickness in the mouth correspondence orientation that shoots material can be substantially inclined Thickness, and this thickness deviation belongs to Systematic Errors, if the point in the i.e. a certain orientation of film bubble is partially thick, follow-up film bubble out Continue thickness partially in the orientation, whereas if the point in a certain orientation of film bubble is partially thin, then follow-up film bubble out continues partially in the orientation Thin, after institute's conventional manner described above winding film, if untreated, thick point（Or title salient point）Can be in the same position of coiled material Gradually add up superposition, make the film roll thickness after winding seriously uneven, produce quick-fried muscle phenomenon, wind of poor quality.

In order to overcome disadvantages mentioned above, people to devise rotary tractor, such as CN203331410U China utility model Structure shown by patent, it can be such that traction nip rolls rotates around head central axis, that is, draw nip rolls relative to inflation film manufacturing machine mould Head（Film bubble）Rotation, distributing position of such film thickness point on coiled material just presents distributed wave state, along the axle of coiled material To spreading out, thickness Systematic Errors are thus preferably solved the problems, such as and the winding accumulation that brings, make the thickness point of film It is uniformly distributed in the axial direction of coiled material, will not accumulates in same position, reaches the smooth purpose of winding.

In rotation traction traction structure disclosed in above-mentioned CN203331410U, in order that thin on rotating traction nip rolls Film can be stably delivered on fixed horizontal stationary guide roller, generally set between traction nip rolls and horizontal stationary guide roller First level moveable idler, the second horizontal anomalous movement deflector roll, the 3rd horizontal anomalous movement deflector roll, the 4th horizontal anomalous movement deflector roll are put, from vertical Position sees, the 4th horizontal anomalous movement deflector roll, the 3rd horizontal anomalous movement deflector roll, the second horizontal anomalous movement deflector roll, first level moveable idler Vertical position is reduced successively；Traction nip rolls, first level moveable idler, the second horizontal anomalous movement is driven to lead by gear drive Roller, the 3rd horizontal anomalous movement deflector roll, the 4th horizontal anomalous movement deflector roll rotate around the central axis of annular extrusion（Annular extrusion Central axis is Chong Die with the central axis of film bubble in theory）, wherein traction nip rolls and first level moveable idler synchronous axial system, And first level moveable idler, the second horizontal anomalous movement deflector roll, the 3rd horizontal anomalous movement deflector roll, the angle of rotation of the 4th horizontal anomalous movement deflector roll Degree size is 4:3:2:1, during work, after plastic sheeting is through drawing nip rolls, first level moveable idler, the second water are bypassed successively Flat moveable idler, the 3rd horizontal anomalous movement deflector roll, the 4th horizontal anomalous movement deflector roll, reach horizontal stationary guide roller, so, no matter haulage clip Roller turns to any angle, and when plastic sheeting reaches horizontal stationary guide roller in theory, its direction of transfer is all solid perpendicular to level Determine deflector roll, smoothly realize winding.

However, applicant has found in production practices, existing above-mentioned rotary tractor still suffers from following deficiency：Through leading Draw nip rolls, first level moveable idler, the second horizontal anomalous movement deflector roll, the 3rd horizontal anomalous movement deflector roll, the 4th horizontal anomalous movement deflector roll After rotation traction traction, although " no matter what angle traction nip rolls turns to, plastic sheeting reaches in theory horizontal stationary guide roller When, its direction of transfer is all perpendicular to horizontal stationary guide roller ", but, when plastic sheeting reaches horizontal stationary guide roller, its position is but Can skew of fluctuating back and forth occur in the axial direction of horizontal stationary guide roller, its concrete reason as shown in figure 1, in FIG, plastic sheeting After through drawing nip rolls, first level moveable idler 31 is first bypassed, the fragment as shown in ABCD in Fig. 1, further around the second level of crossing Moveable idler 32, becomes the fragment shown in CDEF in Fig. 1, further around the 3rd horizontal anomalous movement deflector roll 33 is crossed, becomes EFGH institutes in Fig. 1 The fragment shown, further around the 4th horizontal anomalous movement deflector roll 34 is crossed, becomes the fragment shown in GHMN in Fig. 1.It can be seen from figure 1 that plastic sheeting GHMN fragments shift relative to ABCD fragments（Axial direction along horizontal stationary guide roller shifts）, membrane excursion amount It is directly proportional to horizontal anomalous movement deflector roll radius, angle theta is rotated into function tan θ * sin θ relations with the 4th horizontal anomalous movement deflector roll.Due to The rotation angle theta change of horizontal anomalous movement deflector roll, so the film roll edges after winding change back and forth, common solution is most Positive twist by force during rear winding, but by force positive twist effect is often barely satisfactory, in addition due also to both sides pulling force is asymmetric and produces Fold, swing the bad quality problems such as side.

Utility model content

The purpose of this utility model is to overcome disadvantages mentioned above and provide a kind of rotary tractor of inflation film manufacturing machine, and it can There is skew of fluctuating back and forth in amendment film position, make film along the axial direction of horizontal stationary guide roller in the axial direction of horizontal stationary guide roller Position keeps stable.

Its purpose can be realized by below scheme：The rotary tractor of the inflation film manufacturing machine includes extrusion die, extrusion die Annular extrusion is provided with, traction nip rolls, first level moveable idler, the second level is provided with above or below extrusion die and is lived Dynamic deflector roll, the 3rd horizontal anomalous movement deflector roll, the 4th horizontal anomalous movement deflector roll, horizontal stationary guide roller, traction nip rolls, first level activity are led Roller, the second horizontal anomalous movement deflector roll, the 3rd horizontal anomalous movement deflector roll, the vertical distance between the 4th horizontal anomalous movement deflector roll and extrusion die Increase successively；The two ends of first level moveable idler are arranged in first support, and the two ends of the second horizontal anomalous movement deflector roll are arranged on In second support, the two ends of the 3rd horizontal anomalous movement deflector roll are arranged on the 3rd support, and the two ends of the 4th horizontal anomalous movement deflector roll are installed On the 4th support；Wherein, the central shaft of first level moveable idler, the 3rd horizontal anomalous movement deflector roll away from annular extrusion Line, and the second horizontal anomalous movement deflector roll, the 4th horizontal anomalous movement deflector roll are then near the central axis of annular extrusion,

It is additionally provided with and drives traction nip rolls, first support, second support, the 3rd support, the 4th support, first level activity to lead The central axis of roller, the second horizontal anomalous movement deflector roll, the 3rd horizontal anomalous movement deflector roll, the 4th horizontal anomalous movement deflector roll around annular extrusion The rotary drive mechanism for horizontally rotating, wherein, traction nip rolls, first support and first level moveable idler are fixed together and same Step is rotated, and second support and the second horizontal anomalous movement deflector roll are fixed together and synchronous axial system, the 3rd support and the 3rd horizontal anomalous movement Deflector roll is fixed together and synchronous axial system, and the 4th support and the 4th horizontal anomalous movement deflector roll are fixed together and synchronous axial system, and the One horizontal anomalous movement deflector roll, the second horizontal anomalous movement deflector roll, the 3rd horizontal anomalous movement deflector roll, the 4th horizontal anomalous movement deflector roll rotational angle it is big Small scale remains 4:3:2:1；Characterized in that, the second horizontal anomalous movement deflector roll can be installed horizontally slidingly on the secondary support bracket, The direction that second horizontal anomalous movement deflector roll slides relative to second support level also sets perpendicular to the axial direction of the second horizontal anomalous movement deflector roll There is the first screw body for driving the second horizontal anomalous movement deflector roll to slide relative to second support level；4th horizontal anomalous movement deflector roll energy Horizontally slidingly be arranged on the 4th support, the direction that the 4th horizontal anomalous movement deflector roll slides relative to the 4th support level perpendicular to The axial direction of the 4th horizontal anomalous movement deflector roll, is additionally provided with drive the 4th horizontal anomalous movement deflector roll to slide relative to the 4th support level second Screw body.

Second horizontal anomalous movement deflector roll is fixedly connected with the first lead column, and second support is provided with the first pilot hole, and first is oriented to Post is arranged in the first pilot hole in which can be slidably matched, and the axial direction of the first lead column is for horizontal direction and perpendicular to the second level The axial direction of moveable idler；First lead column central authorities are formed with the first screw, and twist-on has the first screw mandrel in the first screw；It is additionally provided with drive The first lead screw motor that dynamic first screw mandrel is rotated, the first lead screw motor is fixedly mounted on above second support；First screw mandrel, first Screw, the first lead screw motor form first screw body.

4th horizontal anomalous movement deflector roll is fixedly connected with the second lead column, and the 4th support is provided with the second pilot hole, and second is oriented to Post is arranged in the second pilot hole in which can be slidably matched, and the axial direction of the second lead column is for horizontal direction and perpendicular to the 4th level The axial direction of moveable idler, the second lead column central authorities are formed with the second screw, and twist-on has the second screw mandrel in the second screw；It is additionally provided with drive The second lead screw motor that dynamic second screw mandrel is rotated, the second lead screw motor is fixedly mounted on above the 4th support；Second screw mandrel, second Screw, the second lead screw motor form second screw body.

Central controller, the second horizontal anomalous movement deflector roll of detection or the 4th horizontal anomalous movement deflector roll are additionally provided with around annular extrusion Central axis horizontally rotate the encoder of angular dimension, encoder connection central controller, central controller connects first Linkage, the second screw body.

The second horizontal anomalous movement deflector roll, the 4th horizontal anomalous movement deflector roll are preferably air cushion roller.

The utility model has advantages below and effect：

First, during utility model works, traction nip rolls, first level moveable idler, the second horizontal anomalous movement deflector roll, the 3rd Horizontal anomalous movement deflector roll, the 4th horizontal anomalous movement deflector roll around the central axis of annular extrusion horizontally rotate while, the first screw mandrel Mechanism can also drive the second horizontal anomalous movement deflector roll occurred level to move, and the second screw body can also drive the 4th horizontal anomalous movement Deflector roll occurred level is moved, and the direction for moving horizontally thus can be corrected thin perpendicular to the axial direction of correspondence horizontal anomalous movement deflector roll Film swings back and forth the membrane excursion amount of skew in the axial direction of horizontal stationary guide roller, and the amount of movement for moving horizontally according to Second（Four）The anglec of rotation of horizontal anomalous movement deflector roll is controlled, and makes revised membrane excursion amount always remain as zero, makes thin Film keeps stable along the axial location of horizontal stationary guide roller, it is to avoid the fold that needs positive twist film during winding and produce, swings side and asks Topic.

Description of the drawings

Fig. 1 is the principle schematic that membrane excursion problem occurs in the rotary tractor of traditional inflation film manufacturing machine.

Fig. 2 is a kind of structural representation of embodiment of the utility model.

Fig. 3 is second in Fig. 2（Four）Horizontal anomalous movement deflector roll mounting structure schematic diagram.

Fig. 4 is the decomposing schematic representation of structure shown in Fig. 3.

Fig. 5 is K-K cross-sectional views in Fig. 3.

Fig. 6 be structure shown in Fig. 2 first level moveable idler around the central axis of annular extrusion the anglec of rotation In 0 ° when use state schematic diagram.

Fig. 7 is the overlooking the structure diagram of state shown in Fig. 6.

Fig. 8 be structure shown in Fig. 2 first level moveable idler around the central axis of annular extrusion the anglec of rotation In 180 ° when use state schematic diagram.

Fig. 9 is the overlooking the structure diagram of state shown in Fig. 8.

Specific embodiment

Shown in Fig. 2, the rotary tractor of the inflation film manufacturing machine includes extrusion die 1, and extrusion die 1 is provided with annular extrusion Mouthful, traction nip rolls 30, first level moveable idler 31, the second horizontal anomalous movement deflector roll 31, the 3rd water are provided with above extrusion die Flat moveable idler 33, the 4th horizontal anomalous movement deflector roll 34, horizontal stationary guide roller 35,

Traction nip rolls 30, first level moveable idler 31, the second horizontal anomalous movement deflector roll 32, the 3rd horizontal anomalous movement deflector roll 33, Vertical distance between 4th horizontal anomalous movement deflector roll 34 and extrusion die 1 increases successively；The two ends of first level moveable idler 31 In first support, the two ends of the second horizontal anomalous movement deflector roll 32 are arranged in second support 42, the 3rd horizontal anomalous movement deflector roll 33 two ends are arranged on the 3rd support, and the two ends of the 4th horizontal anomalous movement deflector roll 34 are arranged on the 4th support 44, wherein, first , away from the central axis S of annular extrusion, and the second horizontal anomalous movement is led for horizontal anomalous movement deflector roll 31, the 3rd horizontal anomalous movement deflector roll 33 Roller 32, the 4th horizontal anomalous movement deflector roll 34 are then near the central axis S of annular extrusion；Second horizontal anomalous movement deflector roll the 32, the 4th Horizontal anomalous movement deflector roll 34 is air cushion roller.

It is additionally provided with driving traction nip rolls 30, first support, second support 42, the 3rd support, the 4th support 44, first level Moveable idler 31, the second horizontal anomalous movement deflector roll 32, the 3rd horizontal anomalous movement deflector roll 33, the 4th horizontal anomalous movement deflector roll 34 are squeezed around annular The rotary drive mechanism that the central axis S of outlet horizontally rotates, wherein, draw nip rolls 30, first support and first level activity Deflector roll 31 is fixed together and synchronous axial system, and second support 42 is fixed together and synchronous turn with the second horizontal anomalous movement deflector roll 32 Dynamic, the 3rd support and the 3rd horizontal anomalous movement deflector roll 33 are fixed together and synchronous axial system, the 4th support 44 and the 4th horizontal anomalous movement Deflector roll 34 is fixed together and synchronous axial system, and first level moveable idler 31, the second horizontal anomalous movement deflector roll 32, the 3rd level are lived Dynamic deflector roll 33, the rotational angle size of the 4th horizontal anomalous movement deflector roll 34 remain 4:3:2:1.

Shown in Fig. 3, Fig. 4, Fig. 5, the second horizontal anomalous movement deflector roll 32 can be horizontally slidingly arranged in second support 42, and second The direction that horizontal anomalous movement deflector roll 32 slides relative to the level of second support 42 perpendicular to the axial direction of the second horizontal anomalous movement deflector roll 32, also It is provided with the first screw body for driving the second horizontal anomalous movement deflector roll 32 to slide relative to the level of second support 42；Specifically, Two horizontal anomalous movement deflector rolls 32 are fixedly connected with the first lead column 51, and second support 42 is provided with the first pilot hole 61, the first lead column 51 are arranged in the first pilot hole 61 in which can be slidably matched, and the axial direction of the first lead column 51 is for horizontal direction and perpendicular to second The axial direction of horizontal anomalous movement deflector roll 32；The central authorities of first lead column 51 are formed with the first screw 71, and twist-on has first in the first screw 71 Screw mandrel 81；The first lead screw motor 91 for driving the first screw mandrel 81 to rotate is additionally provided with, the first lead screw motor 91 is fixedly mounted on second Above support 42；First screw mandrel 81, the first screw 71, the first lead screw motor 91 form first screw body.

Shown in Fig. 3, Fig. 4, Fig. 5, the 4th horizontal anomalous movement deflector roll 34 can be horizontally slidingly arranged on the 4th support 44, and the 4th The direction that horizontal anomalous movement deflector roll 34 slides relative to the level of the 4th support 44 perpendicular to the axial direction of the 4th horizontal anomalous movement deflector roll 34, also It is provided with the second screw body for driving the 4th horizontal anomalous movement deflector roll 34 to slide relative to the level of the 4th support 44；Specifically, Four horizontal anomalous movement deflector rolls 34 are fixedly connected with the second lead column 52, and the 4th support 44 is provided with the second pilot hole 62, the second lead column 52 are arranged in the second pilot hole 62 in which can be slidably matched, and the axial direction of the second lead column 52 is for horizontal direction and perpendicular to the 4th The axial direction of horizontal anomalous movement deflector roll 34；The central authorities of second lead column 52 are formed with the second screw 72, and twist-on has second in the second screw 72 Screw mandrel 82；The second lead screw motor 92 for driving the second screw mandrel 82 to rotate is additionally provided with, the second lead screw motor 92 is fixedly mounted on the 4th Above support 44；Second screw mandrel 82, the second screw 72, the second lead screw motor 92 form second screw body.

It is additionally provided with the central axis S levels of central controller, the second horizontal anomalous movement deflector roll 32 of detection around annular extrusion The encoder of rotational angle, encoder connection central controller, central controller connects the first screw mandrel electricity of the first screw body Second lead screw motor 92 of machine 91, the second screw body.

Above-described embodiment course of work and principle are as follows：

During work, fused materials are provided with after annular extrusion extrusion by extrusion die 1, become film bubble 20, and film bubble 20 is transported Passed through after traction nip rolls 30, became double-plastic 2, double-plastic 2 bypass successively first level moveable idler 31, Second horizontal anomalous movement deflector roll 32, the 3rd horizontal anomalous movement deflector roll 33, the 4th horizontal anomalous movement deflector roll 34, reach horizontal stationary guide roller 35, The last Scroll by parallel to horizontal stationary guide roller 35 winds.

In the process, nip rolls 30, first level moveable idler 31, the second horizontal anomalous movement deflector roll 32, the 3rd level are drawn Moveable idler 33, the 4th horizontal anomalous movement deflector roll 34 rotate around annular extrusion central axis S（Annular extrusion central axis S is Chong Die with the central axis of film bubble 20 in theory）, wherein first level moveable idler, the second horizontal anomalous movement deflector roll, the 3rd water Flat moveable idler, the rotational angle size of the 4th horizontal anomalous movement deflector roll remain 4:3:2:1；

Shown in Fig. 6, Fig. 7, when the rotational angle of first level moveable idler 31 is 0 °, the second horizontal anomalous movement deflector roll 32, the Three horizontal anomalous movement deflector rolls 33, the rotational angle of the 4th horizontal anomalous movement deflector roll 34 are also 0 °, first level moveable idler 31, the second water Flat moveable idler 32, the 3rd horizontal anomalous movement deflector roll 33, the 4th horizontal anomalous movement deflector roll 34, horizontal stationary guide roller 35 are parallel to each other, double The traffic direction of layer plastic sheeting 2 perpendicular to horizontal stationary guide roller 35, as shown in Figure 6, Figure 7.

Shown in Fig. 8, Fig. 9, when first level moveable idler turn an angle for θ when（θ≠0°）No matter, draw nip rolls 30 turn to any angle, and when plastic sheeting 2 reaches horizontal stationary guide roller 35 in theory, its traffic direction is all perpendicular to level Stationary guide roller 35, and in above process, the first screw body, the second screw body can make the second horizontal anomalous movement deflector roll 32nd, the minor levels sidesway of the 4th horizontal anomalous movement deflector roll 34, the axis for making plastic foil abcd fragments in fig .9 is protected always automatically Hold the axis of alignment plastic foil ghmn fragments（As shown in the f of Fig. 9 axis）, it is possible thereby to realize double-plastic 2 in water Will not fluctuate on the axial location of flat stationary guide roller 35, such as shown in Fig. 8, Fig. 9, under state shown in Fig. 8, Fig. 9, first The anglec of rotation of horizontal anomalous movement deflector roll 31 is 180 degree.

In above-described embodiment, the top that nip rolls 30 is located at extrusion die 1, therefore referred to as upward type, in fact, haulage clip are drawn Roller 30 also can be changed to be located at the lower section of extrusion die, i.e. bottom blowing type.

In above-described embodiment, as long as encoder detects the second horizontal anomalous movement deflector roll 32,34 liang of the 4th horizontal anomalous movement deflector roll One of person's horizontally rotates angle, it is possible to which know another one horizontally rotates angle.

Claims (5)

1. a kind of rotary tractor of inflation film manufacturing machine, including extrusion die, extrusion die is provided with annular extrusion, extrusion die Above or below be provided with traction nip rolls, first level moveable idler, the second horizontal anomalous movement deflector roll, the 3rd horizontal anomalous movement deflector roll, 4th horizontal anomalous movement deflector roll, horizontal stationary guide roller, traction nip rolls, first level moveable idler, the second horizontal anomalous movement deflector roll, the 3rd Vertical distance between horizontal anomalous movement deflector roll, the 4th horizontal anomalous movement deflector roll and extrusion die increases successively；First level activity is led The two ends of roller are arranged in first support, and the two ends of the second horizontal anomalous movement deflector roll are installed on the secondary support bracket, the 3rd horizontal anomalous movement The two ends of deflector roll are arranged on the 3rd support, and the two ends of the 4th horizontal anomalous movement deflector roll are arranged on the 4th support；Wherein, the first water Flat moveable idler, the 3rd horizontal anomalous movement deflector roll away from annular extrusion central axis, and the second horizontal anomalous movement deflector roll, the 4th Horizontal anomalous movement deflector roll is then near the central axis of annular extrusion；Be additionally provided with driving traction nip rolls, first support, second Frame, the 3rd support, the 4th support, first level moveable idler, the second horizontal anomalous movement deflector roll, the 3rd horizontal anomalous movement deflector roll, the 4th The rotary drive mechanism that horizontal anomalous movement deflector roll horizontally rotates around the central axis of annular extrusion, wherein, traction nip rolls, first Support is fixed together and synchronous axial system with first level moveable idler, and second support is fixed on one with the second horizontal anomalous movement deflector roll Rise and synchronous axial system, the 3rd support and the 3rd horizontal anomalous movement deflector roll are fixed together and synchronous axial system, the 4th support and the 4th water Flat moveable idler is fixed together and synchronous axial system, and first level moveable idler, the second horizontal anomalous movement deflector roll, the 3rd level are lived Dynamic deflector roll, the rotational angle size of the 4th horizontal anomalous movement deflector roll remain 4:3:2:1；It is characterized in that：Second level is lived Dynamic deflector roll can be installed horizontally slidingly on the secondary support bracket, the side that the second horizontal anomalous movement deflector roll slides relative to second support level The second horizontal anomalous movement deflector roll is driven to slide relative to second support level to perpendicular to the axial direction of the second horizontal anomalous movement deflector roll, being additionally provided with The first dynamic screw body；4th horizontal anomalous movement deflector roll horizontally slidingly can be arranged on the 4th support, and the 4th horizontal anomalous movement is led The direction that roller slides relative to the 4th support level is additionally provided with the 4th level of driving perpendicular to the axial direction of the 4th horizontal anomalous movement deflector roll The second screw body that moveable idler slides relative to the 4th support level.

2. the rotary tractor of inflation film manufacturing machine according to claim 1, it is characterised in that：Second horizontal anomalous movement deflector roll is fixed The first lead column is connected with, second support is provided with the first pilot hole, and the first lead column is oriented in which can be slidably matched installed in first Kong Zhong, the axial direction of the first lead column is for horizontal direction and perpendicular to the axial direction of the second horizontal anomalous movement deflector roll；In first lead column Centre is formed with the first screw, and twist-on has the first screw mandrel in the first screw；It is additionally provided with the first screw mandrel electricity for driving the first screw mandrel to rotate Machine, the first lead screw motor is fixedly mounted on above second support；First screw mandrel, the first screw, the first lead screw motor form described First screw body.

3. the rotary tractor of inflation film manufacturing machine according to claim 1, it is characterised in that：4th horizontal anomalous movement deflector roll is fixed The second lead column is connected with, the 4th support is provided with the second pilot hole, and the second lead column is oriented in which can be slidably matched installed in second Kong Zhong, the axial direction of the second lead column is for horizontal direction and in the axial direction of the 4th horizontal anomalous movement deflector roll, the second lead column Centre is formed with the second screw, and twist-on has the second screw mandrel in the second screw；It is additionally provided with the second screw mandrel electricity for driving the second screw mandrel to rotate Machine, the second lead screw motor is fixedly mounted on above the 4th support；Second screw mandrel, the second screw, the second lead screw motor form described Second screw body.

4. the rotary tractor of the inflation film manufacturing machine according to claim 1,2 or 3, it is characterised in that：It is additionally provided with central control Device, the second horizontal anomalous movement deflector roll of detection or the 4th horizontal anomalous movement deflector roll horizontally rotate angle around the central axis of annular extrusion The encoder of size, encoder connection central controller, central controller connects the first screw body, the second screw body.

5. the rotary tractor of the inflation film manufacturing machine according to claim 1,2 or 3, it is characterised in that：Second level is lived Dynamic deflector roll, the 4th horizontal anomalous movement deflector roll are air cushion roller.