CN103568308B - The chain pincers system of plastic foil stretching production line double-layer track chain - Google Patents

Abstract

The present invention is a chain clasp system with double-layer tracks and double-chains in a plastic film stretching production line. Each side has two upper and lower layers of the same track and two upper and lower identical chains. Seat, upper (lower) track is positioned between upper (lower) support plate and middle support plate, and upper (lower) support plate (lower) side fixes 2 chain links of upper (lower) layer chain. One upper (lower) middle inner bearing and one upper (lower) middle and outer bearing are fixed on the (lower) side of the middle support plate. Two upper (lower) outer bearings are fixed on the lower (upper) side of the upper (lower) support plate. Each bearing is tangent to the side surface of the upper (lower) track respectively. The distance between the plane where the sandwich opening is located and the horizontal mid-section plane of the middle support plate is less than 5mm. The top end bearing above the upper support plate is tangent to the top surface of the upper track. During operation, the upper and lower chains drive the chain clips, and the tension of the thick film is distributed on the upper and lower tracks through the bearings, which increases the stress on the force-bearing surface and makes the parts less prone to deformation and damage, ensuring reliable operation.

Description

Chain clip system with double-layer track and double-chain in plastic film stretching production line

technical field

The invention relates to a chain clip system for clamping a film in a plastic film stretching production line, in particular to a chain clip system with double-layer rails and double chains in a plastic film stretching production line.

Background technique

In the plastic film stretching production line, in order to apply force to the lateral sides of the plastic film during the stretching process to perform transverse stretching or reduce the transverse shrinkage of the film during longitudinal stretching, a chain clip system must be installed. The chain clip system includes 2 fixed circulating rails, 2 chains and multiple clips on both sides of the horizontal drawing machine in the production line. Multiple chain clips are installed equidistantly on each chain, and each side track is equipped with a chain. During the process, the chain, with the clips on the side of the clamping film, travels synchronously in the same direction as the plastic film on the process track. During the return journey, the chain clips are opened and separated from the film, and the chain takes the chain clips on the return track from the exit of the horizontal drawing machine to the entrance.

When the thickness of the plastic film produced is greater than 100 μm, it is considered a thick film. When the thick film production line is working, the tensile force of stretching the thick film is very large. Under the action of heavy load, the bearings of the chain clips fixedly installed on the chain links of the single-row chain are easy to detach from the track of the horizontal drawing machine. Due to the force of the chain clips The unevenness of the track and the chain clip parts are prone to deformation, or even breakage, which affects the safe operation of the production line.

Contents of the invention

The purpose of the present invention is to design a double-layer track and double-chain chain clip system for a plastic film stretching production line. On each side of the plastic film stretching production line, there are upper and lower layers of rails, equipped with two upper and lower chains, and the chain clips are fixedly connected to the upper and lower chains. chain link. It is suitable for thick film stretching to ensure that the chain clips are evenly stressed and run smoothly and reliably on the track.

The chain clamp system of the double-layer track and double chain of the plastic film stretching production line designed by the present invention includes a chain clamp, a track and a chain, and a plurality of chain links are sequentially connected by upper and lower chain pieces to form a chain, and a plurality of chain clamps are installed on the chain , the chain is connected with the driving device of the chain clamp system, the chain clamp includes the clamp body and the clamp handle, the long axis rotatably installs the clamp handle on the clamp body, and the spring sleeve connects the clamp handle and the clamp body; the chain clamp is stuck on the track, and the drive The device drives the chain to run, and the clips on the chain travel on the track.

The clip body of the chain clip system in this chain clip system is fixedly connected to the support seat. The longitudinal section of the support seat is "E"-shaped, including the longitudinal support plate and the horizontal upper, middle and lower support plates. The inner side of the longitudinal support plate is fixed to the clip body. Connection, the outer side of the longitudinal support plate is connected with the horizontal upper, middle and lower support plates. The plastic film stretching production line of this chain clip system has two identical chains on each side, and two upper and lower tracks on each side. The upper and lower tracks are the same. The projections of the lower track and the upper track on the same horizontal plane Located between the upper support plate and the middle support plate, the lower track is located between the middle support plate and the lower support plate. The horizontal split plane of the middle support plate is equal to the horizontal split plane of the upper track and the horizontal split plane of the lower track. Two chain links of the upper chain are fixed above the upper support plate, and two chain links of the lower chain are fixed below the lower support plate. An upper middle inner bearing and an upper middle outer bearing are fixed above the middle support plate, and the outer rings of the upper middle inner bearing and the upper middle outer bearing are respectively tangent to the inner and outer sides of the upper track bottom. One lower middle inner bearing and one lower middle outer bearing are fixed below the middle support plate, and the outer rings of the lower middle inner bearing and the lower middle outer bearing are respectively tangent to the inner and outer sides of the upper part of the lower track.

Two upper outer bearings are fixed below the upper support plate, and the outer rings of the upper outer bearings are tangent to the upper outer surface of the upper rail. Two lower outer bearings are fixed above the lower support plate, and the outer rings of the lower outer bearings are tangent to the outer surface of the lower part of the lower rail.

The plane where the clamp handle and clamp body are located is parallel to the horizontal mid-section plane of the middle support plate, and the distance between the two planes is less than 5mm.

The center lines of the upper middle inner bearing and the lower middle inner bearing are on the same vertical line; the center lines of the upper middle outer bearing and the lower middle outer bearing are on the same vertical line.

Each upper outer bearing is directly opposite to a lower outer bearing below it, and the centerlines of the two are on the same vertical line.

The mounting holes of the chain links of the upper chains are directly opposite to the mounting holes of the chain links of a lower chain below, and the centerlines of the two are on the same vertical line.

The middle surface of the thickness of the upper middle and outer bearings on the same support seat and the middle surface of the thickness of the upper middle and inner bearings are on the same horizontal plane; Above: the thickness mid-planes of the two upper outer bearings on the same support base are on the same horizontal plane, and the thickness mid-planes of the two lower outer bearings on the same support base are on the same horizontal plane.

The horizontal split plane of the middle support plate is parallel to the middle plane of the thickness of the upper middle and outer bearing, the middle plane of the thickness of the lower middle and outer bearing, the middle plane of the thickness of the upper middle and inner bearing, and the middle plane of the thickness of the lower middle and inner bearing.

The horizontal split plane of the middle support plate is parallel to the middle plane of the thickness of the upper outer bearing and the middle plane of the lower outer bearing, and the distance is equal.

The horizontal middle plane of the upper track is parallel to the middle plane of the thickness of the upper outer bearing and the middle plane of the thickness of the upper middle and outer bearing, and the distance is equal.

The horizontal split plane of the lower track is parallel to the middle plane of the thickness of the lower outer bearing and the middle plane of the lower middle and outer bearing, and the distance is equal.

On both sides of the vertical plane formed by the center line of the upper middle inner bearing and the center line of the upper middle outer bearing fixed by the same support seat, there are respectively an upper outer bearing and a lower outer bearing fixed on the support seat. There is also an upper chain link and a lower chain link fixed on the supporting seat on both sides of the surface, and the distance between the center line of the upper and lower outer bearings and the above-mentioned vertical plane is equal, and the upper and lower chain links are installed The distance between the center line of the hole and the above-mentioned vertical plane is also equal.

A top bearing is also fixed above the upper support plate, and the outer ring of the top bearing is tangent to the top surface of the upper track. The horizontal pin shaft is fixedly connected with the top end bearing and the upper support plate.

The centerline of the horizontal pin shaft is perpendicular to the plane formed by the centerlines of the two upper outer bearings, and the distance from the vertical foot to the centerlines of the two upper outer bearings on the plane is equal.

The upper outer bearing and the lower outer bearing are roller bearings or ball bearings of the same specification, the upper middle outer bearing and the lower middle outer bearing are roller bearings or ball bearings of the same specification, the upper middle inner bearing and the lower middle inner bearing are roller bearings of the same specification Cylindrical or ball bearings.

The clip body has a longitudinal groove with a "T" shape in cross section, the inner side of the longitudinal support plate is embedded in the longitudinal groove of the clip body, and screws are fixed to connect the clip body and the longitudinal support plate. Ensure a firm connection between the clip body and the support base.

The long pin shaft connects the upper and lower support plates and the chain links and chain pieces of the upper and lower chains. The middle part of the long pin shaft has a boss whose diameter is larger than the long pin shaft mounting holes of the upper and lower support plates, the chain link mounting holes, and the chain sheet mounting holes. There is a groove on the upper surface of the upper support plate that surrounds the long pin shaft installation hole and matches with the long pin shaft boss. The lower end of the long pin shaft passes through the long pin shaft installation hole of the upper support plate downwards. The platform is embedded in the groove of the upper support plate, and the upper surface of the boss is flat with the upper surface of the upper support plate, and the long pin shaft above the boss passes through a link installation hole of the upper chain and its upper and lower chain pieces Mounting holes. The upper and lower ends of the long pin are fixed by washers and nuts.

Similarly, the lower surface of the lower support plate has a groove that surrounds the long pin shaft installation hole and matches the long pin shaft boss. The upper end of the long pin shaft passes through the long pin shaft installation hole of the lower support plate upwards, and the long pin shaft The boss of the boss is embedded in the groove of the lower support plate, and the lower surface of the boss is flat with the lower surface of the lower support plate. The long pin shaft under the boss passes through the link installation hole of a lower chain and its upper and lower Chain mounting holes. The upper and lower ends of the long pin are fixed by washers and nuts

The middle pin shaft connects the upper and lower middle inner bearings and the middle support plate, the middle pin shaft passes through the center hole of the lower middle inner bearing, the middle pin shaft installation hole of the middle support plate, and then passes through the center hole of the upper middle inner bearing, the middle pin shaft Both ends are fixed by washers and nuts or one end of the middle pin shaft is a fixed cap and the other end is fixed by washers and nuts. In the same way, the pin shaft connects the lower and upper middle and outer bearings and the middle support plate.

The small pin shaft connects the upper and lower outer bearings and the upper and lower support plates. The pin shaft passes through the lower outer bearing center hole, and then passes through the small pin shaft mounting hole of the lower support plate. The two ends of the small pin shaft are fixed by washers and nuts or one end of the small pin shaft is a fixed cap, and the other end is fixed by a washer and a nut.

When the driving device drives the upper and lower chains to run, the force of the upper and lower chains acts on the chain clip, driving the upper middle inner bearing and the outer ring of the upper middle outer bearing on the chain clip support seat to roll on both sides of the lower part of the upper track, and the lower middle The outer rings of the inner bearings and the lower middle and outer bearings roll on both sides of the upper part of the lower rail, the outer rings of the upper outer bearings roll on the upper outer side of the upper rail, the outer rings of the lower outer bearings roll on the lower outer side of the lower rail, and the top bearings run on the upper side of the track Rolling on the end face, the rolling friction between each bearing and the track makes the friction of the chain clip running small. At the same time, because the clip handle of the chain clip and the clip film mouth of the clip body are located in the plane, close to or located in the horizontal mid-section plane of the middle support plate of the support seat, the inward lateral pulling force of the plastic film borne by the chain clip passes through the upper outer bearing, The upper middle and outer bearings, upper middle and inner bearings, lower middle and outer bearings, lower middle and inner bearings, and lower outer bearings are distributed on the upper track and the lower track, which not only increases the force-bearing surface of the chain clip and the track, but also makes the force of the clip body uniform, ensuring The chain clips run smoothly and reliably on the upper and lower tracks of the horizontal stretching machine.

Compared with the prior art, the present invention has the advantages of the clip system of double-layer rails and double chains of the plastic film stretching production line: 1. The clip parts with the largest force are fixed on the double chains, and the force is horizontal. The cross-section is significantly enlarged, and its tensile strength is significantly improved, ensuring that the parts of the chain clip are not easily deformed and broken; 2. To meet the needs of thick film production lines, under the action of heavy loads, the upper and lower rails are embedded in the chain clip support seat Between the upper and lower bearings, it is extremely difficult to get out of the track of the horizontal stretching machine to ensure the safe operation of the production line; it is suitable for transverse stretching of thick plastic films with a thickness of 80-300 μm; 3. The clamping mouth of the clip handle and clip body The plane is located in the middle of the supporting seat of the clip body, and the inward lateral pulling force of the plastic film borne by the clip is distributed between the upper track and the lower track, which not only increases the stress surface of the clip and the track, but also makes the clip evenly stressed , The chain clip and the track are not easy to break, damage and deform; 4. The chain clip body and the supporting seat adopt a split structure, which is easy to install and disassemble, and the chain clip is easy to replace and maintain.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of a chain clip system with double-layer tracks and double-chains in a plastic film stretching production line;

Fig. 2 is the A direction view of Fig. 1;

Fig. 3 is a physical schematic diagram of an embodiment of a clip system with double-layer tracks and double-chains in a plastic film stretching production line.

Labels in the figure: 1, clip handle, 2, long shaft, 3, spring sleeve, 4, clamping mouth, 5, clip body, 6, support seat, 7, screw, 8, long pin shaft, 9, chain link, 10, chain piece, 11, small pin shaft, 12, lower outer bearing, 13, lower track, 14, lower middle inner bearing, 15, lower middle outer bearing, 16, middle pin shaft, 17, upper middle outer bearing, 18, upper Middle inner bearing, 19, upper outer bearing, 20, upper track, 21, top bearing, 22, horizontal pin shaft.

B: Horizontal split plane of lower track, C: Mid plane of lower outer bearing thickness, D: Mid plane of lower middle outer bearing thickness, E: Horizontal split plane of middle support plate, F: Mid plane of upper middle outer bearing thickness, G: Upper outer side Mid-plane of bearing thickness, H: horizontal mid-plane of upper rail.

Detailed ways

The embodiment of the clip system of the double-layer track and double chain of the plastic film stretching production line is shown in Figure 1, 2 and Figure 3, including the clip, the track and the chain, and the multiple chain links 9 are sequentially connected by the upper and lower chain pieces 10 Constitute a chain, a plurality of chain clips are installed on the chain, the chain is connected with the driving device of the chain clip system, the chain clip includes a clip body 5 and a clip handle 1, and the long axis 2 rotatably installs the clip handle 1 on the clip body 5, and the spring The sleeve 3 connects the clip handle 1 and the clip body 5 .

The clip body 5 of the chain clip in this chain clip system is fixedly connected to the support seat 6, and the longitudinal section of the support seat 6 is "E" shaped, including the longitudinal support plate and the horizontal upper, middle and lower support plates, and the outer side of the longitudinal support plate is connected Horizontal upper, middle and lower support plates. The clip body 5 has a longitudinal groove with a "T" shape in cross section, the inner side of the longitudinal support plate is embedded in the longitudinal groove of the clip body 5, and the screw 7 is fixedly connected to the clip body 5 and the longitudinal support plate. The plastic film stretching production line of this chain clip system has two identical chains on each side, and two upper and lower tracks on each side. The upper track 20 and the lower track 13 are the same, and the lower track 13 and the upper track 20 are on the same level. The projection coincides, the upper track 20 is located between the upper support plate and the middle support plate, and the lower track 13 is located between the middle support plate and the lower support plate. The middle split plane E of the middle support plate is parallel to the horizontal split plane H of the upper rail 20 and the horizontal split plane B of the lower rail 13 with equal distances.

The thickness mid-plane F of the upper middle and outer bearing 17 on the same support base 6 and the thickness mid-plane of the upper middle inner bearing 18 are on the same horizontal plane; the thickness mid-plane D of the lower middle and outer bearing 15 and the thickness mid-plane of the lower middle and inner bearing 14 are On the same horizontal plane; the thickness middle planes G of the two upper outer bearings 19 on the same supporting seat 6 are on the same horizontal plane, and the thickness middle planes C of the two lower outer bearings 12 are on the same horizontal plane.

The horizontal split plane E of the middle support plate is parallel to the middle plane F of the thickness of the upper middle and outer bearing, the middle plane D of the thickness of the lower middle and outer bearing, the middle plane F of the thickness of the upper middle and inner bearing, and the middle plane D of the thickness of the lower middle and inner bearing is parallel and equal in distance.

The median plane E of the middle support plate is parallel to the middle plane G of the thickness of the upper outer bearing and the middle plane C of the thickness of the lower outer bearing, and the distance is equal.

The horizontal mid-plane H of the upper track is parallel to the mid-plane G of the thickness of the upper outer bearing and the mid-plane F of the upper middle and outer bearings with the same distance.

The horizontal mid-plane B of the lower track is parallel to the mid-plane C of the thickness of the lower outer bearing and the mid-plane D of the thickness of the lower middle and outer bearing, and the distance is equal.

The plane where the clip handle 1 of the chain clip and the clip film opening 4 of the clip body 5 are located coincides with the middle split plane E of the middle support plate.

2 chain links 9 of the upper chain are fixed above the upper support plate, and 2 chain links 9 of the lower chain are fixed below the lower support plate. The long pin shaft 8 connects the chain link 9 and the chain sheet 10 of the upper and lower support plates and the upper and lower chains. Long pin shaft 8 middle part has the boss that diameter is greater than upper and lower support plate long pin shaft 8 installation holes and chain link 9 installation holes, chain sheet 10 installation holes. The upper surface of the upper support plate has a groove that surrounds the installation hole of the long pin shaft 8 and is matched with the boss of the long pin shaft 8. hole, the boss of the long pin shaft 8 is embedded in the groove of the upper support plate, and the upper surface of the boss is flat with the upper surface of the upper support plate, and the long pin shaft 8 above the boss passes through the chain of an upper chain Section 9 mounting holes and its upper and lower chain pieces 10 mounting holes. The upper and lower ends of the long pin shaft 8 are fixed by washers and nuts.

Similarly, the lower surface of the lower support plate has a groove that surrounds the installation hole of the long pin shaft 8 and is matched with the boss of the long pin shaft 8. The upper end of the long pin shaft 8 passes through the long pin of the lower support plate of the support seat 6 upwards Shaft 8 mounting hole, the boss of the long pin shaft 8 is embedded in the groove of the lower support plate, and the lower surface of the boss is flat with the lower surface of the lower support plate, and the long pin shaft 8 under the boss passes through a lower layer The chain link 9 mounting holes of the chain and its upper and lower chain pieces 10 mounting holes. The upper and lower ends of the long pin shaft 8 are fixed by washers and nuts.

The mounting hole of each upper chain link 9 is directly opposite to the mounting hole of a lower chain link 9 below it, and the centerlines of the two are on the same vertical line.

One upper middle inner bearing 18, one upper middle outer bearing 17, one lower middle inner bearing 14, one lower middle outer bearing 15, upper middle inner bearing 18 and upper middle outer bearing 17 are respectively fixed on the upper and lower sides of the middle support plate. The outer rings are respectively tangent to the inner and outer sides of the upper track 20 bottom, and the outer rings of the lower middle inner bearing 14 and the lower middle outer bearing 15 are respectively tangent to the inner and outer sides of the lower track 13 top. The middle pin shaft 16 connects the upper middle inner bearing 18, the lower middle inner bearing 14 and the middle support plate, and the middle pin shaft 16 passes through the center hole of the lower middle inner bearing 14, the middle pin shaft 16 mounting hole of the middle support plate, and then passes through the upper Inner bearing 18 central holes, bearing pin 16 one ends are fixed caps among this example, and the other end is fixed by washer and nut. Bearing pin 16 connects upper middle and outer bearing 17, lower middle and outer bearing 15 and middle support plate in the same way.

Two upper outer bearings 19 are fixed below the upper support plate, and the outer ring of the upper outer bearing 19 is tangent to the outer surface of the upper rail 20 top. Two lower outer bearings 12 are fixed above the lower support plate, and the outer ring of the lower outer bearing 12 is tangent to the outer surface of the lower rail 13 bottom. The small pin shaft 11 connects the upper outer bearing 19, the lower outer bearing 12 and the upper and lower support plates. On the upper support plate, the small pin shaft 11 passes through the center hole of the upper outer bearing 19, and then passes through the small pin shaft 11 of the upper support plate Mounting hole; on the lower support plate, the small pin shaft 11 passes through the lower outer bearing 12 center holes, and then passes through the small pin shaft 11 mounting holes of the lower support plate. Nut fixed. The upper outer bearing 19 is directly opposite to the lower outer bearing 12 below it, and the center lines of the two are on the same vertical line.

An upper outer bearing 19 and a lower outer bearing 12 fixed on the bearing seat 6 are respectively arranged on both sides of the vertical plane formed by the center line of the upper middle inner bearing 18 and the upper middle outer bearing 17 of the said bearing seat 6 fixing. Both sides of the vertical plane also respectively have an upper chain link 9, a chain piece 10 and a lower chain link 9, a chain piece 10 fixed on the support seat 6, and the center of the upper outer bearing 19, the lower outer bearing 12 The distance between the line and the above-mentioned vertical plane is equal, and the distance between the center line of the upper and lower chain link 9 mounting holes and the above-mentioned vertical plane is also equal.

Top bearing 21 is also fixed above the upper support plate, and the outer ring of top bearing 21 is tangent to the top surface of upper track 20 . The horizontal pin shaft 22 is fixedly connected to the top end bearing 21 and the upper support plate.

The centerline of the horizontal pin shaft 22 is perpendicular to the plane formed by the centerlines of the two upper outer bearings 19, and the vertical foot of the vertical line is equal to the distance from the centerlines of the two upper outer bearings 19 on the plane.

Upper outer bearing 19 and lower outer bearing 12, upper middle outer bearing 17 and lower middle outer bearing 15, upper middle inner bearing 18 and lower middle inner bearing 14 are ball bearings of the same specification.

The above-mentioned embodiments are only specific examples for further specifying the purpose, technical solutions and beneficial effects of the present invention, and the present invention is not limited thereto. Any modifications, equivalent replacements, improvements, etc. made within the disclosed scope of the present invention are included in the protection scope of the present invention.

Claims (10)

1. the chain pincers system of plastic foil stretching production line double-layer track chain, comprise chain pincers, track and chain, the upper and lower connection in order by chain sheet (10) of multiple chain link (9) forms chain, multiple chain pincers is arranged on chain, chain is connected with chain pincers system driving device, chain pincers comprises pincers body (5) and pincers handle (1), pincers handle (1) is installed in rotation on pincers body (5) by major axis (2), and spring housing (3) connects pincers handle (1) and pincers body (5); Chain pincers card in orbit, advance in orbit by the chain pincers in the operation of drive unit chain drive-belt, chain; It is characterized in that:

The pincers body (5) of described chain pincers is fixedly connected with supporting base (6), the longitudinal cross-section of supporting base (6) is " E " shape, comprise longitudinal supporting plate and horizontal upper, middle and lower support plate, the inner side of its longitudinal supporting plate is fixedly connected with pincers body (5), and the outside of longitudinal support plate connects horizontal upper, middle and lower support plate; Chain pincers system has upper and lower 2 identical chains in the every side of plastic foil stretching production line, there are 2 layers of upper and lower track every side, get on the right track (20) identical with lower railway (13), lower railway (13) overlaps with (20) projection in same level of getting on the right track, get on the right track (20) between upper bearing plate and middle support plate, lower railway (13) is between middle support plate and lower support plate; In middle support plate, point plane (E) is parallel with point plane (B) in the level of point plane (H), lower railway (13) in the level of get on the right track (20) and apart from equal; 2 chain links (9) of upper strata chain are fixed in the top of upper bearing plate, and 2 chain links (9) of lower floor's chain are fixed in the below of lower support plate; 1 upper inner bearing (18) and 1 upper outer bearing (17) are fixed in the top of middle support plate, and the outer ring of upper inner bearing (18) and upper outer bearing (17) is tangent with the interior lateral surface of (20) bottom of getting on the right track respectively; Middle outer bearing (15) under inner bearing (14) and 1 under the below of middle support plate fixes 1, the outer ring of lower middle inner bearing (14) and lower middle outer bearing (15) is tangent with the interior lateral surface on lower railway (13) top respectively;

2 upper outboard bearings (19) are fixed in the below of described upper bearing plate, and the outer ring of upper outboard bearing (19) is tangent with the lateral surface on (20) top of getting on the right track; 2 lower outboard bearings (12) are fixed in the top of lower support plate, the outer ring of lower outboard bearing (12) and the lateral surface of lower railway (13) bottom tangent.

2. the chain pincers system of plastic foil stretching production line double-layer track chain according to claim 1, is characterized in that:

The centerline of described upper inner bearing (18) and lower middle inner bearing (14) is on same plumb line; The centerline of upper outer bearing (17) and lower middle outer bearing (15) is on same plumb line;

Described each upper outboard bearing (19) is just relative with the lower outboard bearing (12) of below it, and the centerline of the two is on same plumb line;

The installing hole of each chain link (9) of described upper strata chain is just relative with the installing hole of a chain link (9) of the lower floor's chain below it, and the centerline of the two is on same plumb line.

3. the chain pincers system of plastic foil stretching production line double-layer track chain according to claim 2, is characterized in that:

In upper outer bearing (17) thickness on same described supporting base (6) in face (F) and upper inner bearing (18) thickness face in same level;

In lower middle outer bearing (15) thickness on same described supporting base (6) in face (D) and lower middle inner bearing (14) thickness face in same level;

In 2 on same described supporting base (6) upper outboard bearing (19) thickness, face (G) is in same level;

In 2 lower outboard bearing (12) thickness on same described supporting base (6), face (C) is in same level.

4. the chain pincers system of plastic foil stretching production line double-layer track chain according to claim 3, is characterized in that:

Plane (E) is divided with face (D) in face (F), lower middle inner bearing (14) thickness in face (D), upper inner bearing (18) thickness in face (F), lower middle outer bearing (15) thickness in upper outer bearing (17) thickness apart from equal in the level of described middle support plate;

Plane (E) is divided with face (C) in face (G), lower outboard bearing (12) thickness in upper outboard bearing (19) thickness apart from equal in middle support plate;

Get on the right track (20) level in point plane (H) with face (F) in face (G), upper outer bearing (17) thickness in upper outboard bearing (19) thickness apart from equal;

Plane (B) is divided with face (D) in face (C), lower middle outer bearing (15) thickness in lower outboard bearing (12) thickness apart from equal in the level of lower railway (13).

5. the chain pincers system of plastic foil stretching production line double-layer track chain according to claim 1, is characterized in that:

The pincers handle (1) of described chain pincers is parallel with in middle support plate point of plane (E) with the residing plane of the folder film mouth (4) of pincers body (5), and two interplanar distances are less than 5mm.

6. the chain pincers system of plastic foil stretching production line double-layer track chain according to claim 4, is characterized in that:

The vertical guide both sides that the center line of the upper inner bearing (18) that described same supporting base (6) is fixing and upper outer bearing (17) is formed respectively have a fixing upper outboard bearing (19) of this supporting base (6) and a lower outboard bearing (12), the both sides of this vertical guide also respectively have a fixing upper chain link plate (9) of this supporting base (6) and a lower chain chain link (9), and upper outboard bearing (19), the center line of lower outboard bearing (12) is equal with the distance of above-mentioned vertical guide, on, the center line of lower chain chain link (9) installing hole and above-mentioned vertical guide distance also equal.

7. the chain pincers system of plastic foil stretching production line double-layer track chain according to claim 4, is characterized in that:

The top of described upper bearing plate is also fixed with top bearing (21), and the outer ring of top bearing (21) is tangent with the end face of get on the right track (20); Cotter axle (22) is fixedly connected with top bearing (21) and upper bearing plate.

8. the chain pincers system of plastic foil stretching production line double-layer track chain according to claim 7, is characterized in that:

The plane orthogonal that the center line of described cotter axle (22) and 2 center lines going up outboard bearings (19) are formed, and the distance of the intersection point of vertical line center line of a upper outboard bearing (19) to 2 is on this plane equal.

9. the chain pincers system of plastic foil stretching production line double-layer track chain according to claim 1, is characterized in that:

Described pincers body (5) has cross section to be "T"-shaped cannelure, and the inner side inlay card of longitudinal supporting plate in the cannelure of pincers body (5), and has screw (7) to be fixedly connected with pincers body (5) and longitudinal supporting plate.

10. the chain pincers system of plastic foil stretching production line double-layer track chain according to claim 1, is characterized in that:

Long pin shaft (8) connects chain link (9), the chain sheet (10) of upper and lower support plate and upper and lower chain, and long pin shaft (8) middle part has diameter to be greater than the boss of upper and lower support plate long pin shaft (8) installing hole and chain link (9) installing hole, chain sheet (10) installing hole, upper bearing plate upper surface has round long pin shaft (8) installing hole, and the groove matched with long pin shaft (8) boss, long pin shaft (8) lower end is passed down through upper bearing plate long pin shaft (8) installing hole of supporting base (6), the boss of long pin shaft (8) is embedded in the groove of upper bearing plate, and the upper surface of boss is equal with upper bearing plate upper surface, long pin shaft (8) above boss is through chain link (9) installing hole of 1 upper strata chain and its upper and lower chain sheet (10) installing hole, long pin shaft (8) upper, lower end is fixed by packing ring and nut,

Lower support plate lower surface has round long pin shaft (8) installing hole, and the groove matched with long pin shaft (8) boss, long pin shaft (8) upper end is upward through lower support plate long pin shaft (8) installing hole of supporting base (6), the boss of long pin shaft (8) is embedded in the groove of lower support plate, and the lower surface of boss is equal with lower support plate lower surface, long pin shaft (8) below boss is through chain link (9) installing hole of 1 lower floor's chain and its upper and lower chain sheet (10) installing hole, long pin shaft (8) upper, lower end is fixed by packing ring and nut.