CN114228121B

CN114228121B - Stretching device for improving synchronism of thin film at stretching initial section

Info

Publication number: CN114228121B
Application number: CN202210170779.6A
Authority: CN
Inventors: 何汉昭; 梁达辉; 汤智勇
Original assignee: Mce Stretching Industry Co ltd
Current assignee: Foshan Mengsi Tensile Equipment Co.,Ltd.
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2022-05-13
Anticipated expiration: 2042-02-24
Also published as: CN114228121A; WO2023160340A1

Abstract

The invention relates to the technical field of film processing, in particular to a stretching device for improving the synchronism of a film at a stretching initial section, which comprises: support, two annular rail and two drive chain presss from both sides. When the longitudinal and transverse stretching ratio adjustment and high-temperature thermal expansion of the endless track are repeatedly performed, the moving sections on the upstream side and the downstream side of the anchoring section are appropriately adjusted to move along the running direction of the driving chain clamp, so as to meet and compensate the length change of the endless track. Because the anchoring section is relatively fixedly arranged on the bracket along the longitudinal direction and is positioned at the tail end part of the preheating section and/or the head end part of the stretching section, the phenomenon that the relative position of the inner side rail and the outer side rail at the tail end part of the preheating section and/or the head end part of the stretching section does not drift can be ensured under any condition, so that the operation stability of the transmission chain clamp is greatly improved, and meanwhile, the transmission chain clamp can be guided with high precision, the production quality of a film can be improved, and the equipment failure rate is reduced.

Description

Stretching device for improving synchronism of thin film at stretching initial section

Technical Field

The invention relates to the technical field of film processing, in particular to a stretching device for improving the synchronism of a film at a stretching initial section.

Background

The film is stretched in a stretching machine in a certain multiple along the longitudinal direction and the transverse direction in a proper temperature range (in a high elastic state) above the glass transition temperature and below the melting point under the action of external force, so that molecular chains or crystal planes are oriented and orderly arranged in the direction parallel to the plane of the film, then heat setting is carried out in a tensioning state, the oriented macromolecular structure is fixed, and finally the film can be prepared through cooling and subsequent treatment. The traditional film bidirectional synchronous stretching device comprises two annular rails and two transmission chain clamps, wherein the two transmission chain clamps are correspondingly arranged on the two annular rails. The circular orbit comprises a preheating section, a stretching section, a shaping section and a return section. The preheating section, the stretching section, the shaping section and the return section are sequentially connected end to end. The preheating section, the stretching section and the shaping section of one annular track correspond to the preheating section, the stretching section and the shaping section of the other annular track in position one to one. The distance between the stretching sections of the two annular tracks is gradually increased from front to back. The two transmission chain clamps respectively travel along the two circular tracks in a circulating manner, sequentially pass through the preheating section, the stretching section, the shaping section and the return section, and then return to the preheating section, and the process is repeated. When the film passes through the stretching section, the distance between the transmission chain clamps is gradually increased, so that the distance between the two side edges of the film driven by the transmission chain clamps is gradually increased, and the film is transversely stretched. In addition, each annular track comprises an inner side rail and an outer side rail arranged outside the inner side rail. In the stretching section area, the distance between the inner side rail and the outer side rail is gradually reduced from front to back, when the transmission chain clamp runs on the stretching section, the included angle between adjacent chain plates of the transmission chain clamp is correspondingly increased, so that the distance between the clamps connected with the adjacent chain plates is increased, namely the film is longitudinally stretched.

However, in the long-term production process, under the repeated longitudinal and transverse stretching ratio adjustment and temperature thermal expansion of the endless track, in the initial region of the film stretching section, the inner side rail and the outer side rail have relative position drift (i.e. there is dislocation along the running direction of the film), which greatly interferes with the running stability and consistency of the driving chain clamps at both sides of the film at the stretching section, especially in the high-speed synchronous stretching of high-strength film. In the actual production process, the actual separation point (stretching point) of the adjacent transmission chain clamps is often in a vibrating and drifting state, so that high-precision guiding of the transmission chain clamps cannot be realized, and the negative influence on the quality of the film, the improvement of the productivity and the failure rate of equipment is formed.

Disclosure of Invention

In view of the above, there is a need to overcome the drawbacks of the prior art and to provide a stretching apparatus which improves the synchronization of the film in the stretching start section, and which can improve the operation stability of the driving chain clamp and at the same time guide the driving chain clamp with high precision.

The technical scheme is as follows: a stretching apparatus for improving synchronism of a film in a stretching start section, comprising: the device comprises a support, two annular rails and two transmission chain clamps, wherein the two annular rails are arranged on the support, and the two transmission chain clamps are correspondingly arranged on the two annular rails one by one; the annular track comprises a preheating section, a stretching section and a return section which are connected in sequence; the preheating section and the stretching section of one of the annular rails are arranged opposite to the preheating section and the stretching section of the other annular rail; the track formed by combining the preheating section and the stretching section comprises an anchoring section and at least two moving sections connected with the anchoring section, the anchoring section is relatively and fixedly arranged on the bracket along the forward moving direction of the film, and the anchoring section is positioned at the tail end part of the preheating section and/or the head end part of the stretching section; the moving section is movably arranged on the bracket along the forward running direction of the film.

In the stretching apparatus for improving the synchronization of the film in the stretching start stage, when the endless track is repeatedly subjected to longitudinal and transverse stretching ratio adjustment and high-temperature thermal expansion, the moving sections on the upstream side and the downstream side of the anchoring section are appropriately moved and adjusted along the running direction of the driving chain clamp, so as to satisfy and compensate the length change of the endless track. Because the anchoring section is relatively fixedly arranged on the bracket along the longitudinal direction and is positioned at the tail end part of the preheating section and/or the head end part of the stretching section, the phenomenon that the relative position of the inner side rail and the outer side rail at the tail end part of the preheating section and/or the head end part of the stretching section does not drift can be ensured under any condition, so that the operation stability of the transmission chain clamp is greatly improved, and meanwhile, the transmission chain clamp can be guided with high precision, the production quality of a film can be improved, and the equipment failure rate is reduced.

Further, the anchoring section comprises two first rails arranged on the bracket at intervals, and a first seat plate connecting the two first rails, wherein the first seat plate is movably arranged on the bracket along the transverse direction; the anchor section further includes a first movement assembly for driving the first seat pan to move along the lateral direction.

Further, the first moving assembly comprises a first base fixedly arranged on the support, a first sliding seat movably arranged on the first base along the transverse direction, and a first driving assembly connected with the first sliding seat, and the first seat plate is fixedly arranged on the first sliding seat.

Furthermore, a reinforcing block is arranged on the first seat plate and is positioned between the two first rails and is respectively connected with the two first rails.

Further, when the anchoring section is located at a terminal portion of the preheating section and a head portion of the stretching section; the anchoring section comprises two first rails which are arranged on the support at intervals, and the first rails are arc-shaped or folded.

Further, the anchoring section comprises two first rails which are arranged on the bracket at intervals; the first rail is a hard piece.

Further, the moving section comprises two second rails which are arranged on the bracket at intervals; the second rail is an elastic piece; the two second rails are correspondingly connected with the two first rails.

Further, the anchoring section comprises two first rails which are arranged on the bracket at intervals; the two first rails are arranged in parallel with each other.

Further, the moving section includes: the two second seat plates are correspondingly connected with the two second rails one by one, and both the two second seat plates can be movably arranged on the bracket along the forward running direction of the film; and the second moving assemblies are respectively connected with the two second seat plates and are used for driving the two second seat plates to move along the transverse direction.

Furthermore, each annular track is provided with a telescopic section corresponding to the inlet part and the outlet part of the oven.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a stretching apparatus for improving the synchronization of a film in a stretching initiation section according to an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of an anchored road segment;

FIG. 3 is a schematic structural view of a stretching section;

FIG. 4 is a schematic diagram of a moving section;

fig. 5 is a schematic structural diagram of the telescopic link.

10. An annular track; l is₁A preheating section; l is₂A stretching section; l is₂₁A pre-transverse pulling section; l is₂₂A synchronous stretching section; l is₃And a shaping section; l is₄And a cooling section; p, a return segment; 101. an inner side rail; 102. an outer side rail; 11. an anchoring section; 111. a first rail; 112. a first seat plate; 113. a first moving assembly; 1131. a first base; 1132. a first slider; 1133. a first screw; 1134. a first hand wheel; 114. a reinforcing block; 12. moving the road section; 121. a second rail; 122. a second seat plate; 1221. hinging a shaft; 123. a second base; 124. a second slide carriage; 1241. a waist-shaped hole; 1242. a fixing plate; 1243. a sliding plate; 125. a second screw; 126. a second hand wheel; 127. a third screw; 128. a third hand wheel; 13. a stretch section; 131. a third rail; 1311. a moving rail; 20. a drive chain clamp; 30. a film; 40. an oven; 50. a drive sprocket; 61. an entrance platform; 62. an exit platform.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Referring to fig. 1 to 3, fig. 1 is a schematic structural view illustrating a stretching apparatus for improving the synchronization of a film in a stretching start section according to an embodiment of the present invention, fig. 2 is a schematic structural view illustrating an anchoring section 11, and fig. 3 is a schematic structural view illustrating a stretching section L₂Schematic structural diagram of (1). An embodiment of the present invention provides a stretching apparatus for improving synchronization of a film at a stretching start section, including: a bracket (not shown), two endless tracks 10 and two drive chain clamps 20. The two circular tracks 10 are arranged on the support, and the two driving chain clamps 20 are arranged on the two circular tracks 10 in a one-to-one correspondence manner. The circular track 10 comprises successively connected preheating sections L₁Stretching section L₂And a backhaul segment P. Wherein a preheating section L of the endless track 10₁Stretching section L₂With a preheating section L of another endless track 10₁Stretching section L₂Are oppositely arranged. Preheating stage L₁And a stretching section L₂The track formed in combination comprises an anchoring section 11 and at least two moving sections 12 connected to the anchoring section 11. The anchoring sections 11 are arranged on the support in a relatively fixed manner along the longitudinal direction (e.g. the X-axis direction in fig. 1), the anchoring sections 11 being located in the preheating section L₁And/or the head end of the stretch section L2. The travel section 12 is movably arranged on the carriage in the longitudinal direction.

It can be understood that the driving chain clamps 20 can move circumferentially along the circular track 10 in a reciprocating manner under the driving action of the driving chain disc 50, wherein one side of the driving chain clamp 20 holding the film 30 moves the film 30 forward when the driving chain clamp runs in the clamping working section, and the other side of the driving chain clamp 20 holding the film 30 moves the film 30 forward when the driving chain clamp runs in the clamping working section.

It should be noted that the longitudinal direction refers to a running direction in which the driving chain clamp 20 drives the film 30 to run forward during the stretching operation, that is, a length direction of the film 30, as shown in the X-axis direction in fig. 1. Accordingly, longitudinal stretching refers to achieving a lengthwise growth of the film 30. The transverse direction refers to a direction which is in the same plane as the surface of the film 30 and perpendicular to the longitudinal direction, that is, the width direction of the film 30, as shown in the Y-axis direction in fig. 1. Accordingly, transverse stretching refers to achieving a widthwise growth of the film 30.

It should be noted that the anchor section 11 is arranged on the bracket in a relatively fixed manner in the longitudinal direction, which means that the anchor section 11 cannot move relative to the bracket in the longitudinal direction, i.e. both remain relatively stationary in the longitudinal direction.

Note that the preheating section L₁The end position of (A) means a preheating stage L₁Upper distance stretching section L₂The nearest end. Stretch zone L₂The head end portion of (A) is a stretching section L₂Upper distance preheating section L₁The nearest end.

In the stretching apparatus for improving the synchronization of the film in the stretching start stage, when the endless track 10 is repeatedly subjected to the longitudinal and transverse stretching ratio adjustment and the high-temperature thermal expansion, the moving sections 12 on the upstream and downstream sides of the anchor section 11 are appropriately moved and adjusted along the running direction of the driving chain clamp 20 to satisfy and compensate the length change of the endless track 10. The anchoring sections 11 are relatively fixedly arranged on the bracket along the longitudinal direction and are positioned at the preheating section L₁End part and/or stretch section L of₂So as to ensure that, in any case, the preheating section L₁End part and/or stretch section L of₂The inner side rail 101 and the outer side rail 102 at the head end part of the film 30 can not generate the relative position drift phenomenon, so that the operation stability of the transmission chain clamp 20 is greatly improved, and meanwhile, the transmission chain clamp 20 can be guided with high precision, the production quality of the film 30 can be improved, and the equipment failure rate is reduced.

Referring to fig. 2, in one embodiment, the anchoring section 11 includes two first rails 111 disposed on the bracket at intervals, and a first seat plate 112 connecting the two first rails 111. The first seat plate 112 is movably provided on the bracket in the lateral direction. The anchor section 11 further includes a first moving assembly 113, and the first moving assembly 113 is used to drive the first seat plate 112 to move in the lateral direction. Thus, after the first moving assembly 113 drives the first seat plate 112 to move along the transverse direction, the distance between the two anchoring sections 11 can be adjusted, and thus the stretching amount of the film 30 along the transverse direction can be correspondingly adjusted when the driving chain clamp 20 runs on the anchoring sections 11, so as to adjust the transverse stretching ratio.

Referring to fig. 2, in one embodiment, the first moving assembly 113 includes a first base 1131 fixedly disposed on the support, a first slide 1132 movably disposed on the first base 1131 along a transverse direction, and a first driving assembly connected to the first slide 1132. The first seat plate 112 is fixedly disposed on the first slider 1132. Thus, the first driving assembly drives the first slider 1132 to move, the first slider 1132 moves on the first base 1131 along the transverse direction, and in the moving process of the first slider 1132, the first seat plate 112 can be correspondingly driven to move along the transverse direction, so that the distance between the two oppositely arranged anchor sections 11 can be adjusted.

Specifically, the first driving assembly includes a first screw 1133 and a first pushing block (not shown). The first pushing block is connected to the first sliding base 1132, and a first screw hole corresponding to the first screw 1133 is disposed on the first pushing block. The first screw 1133 is disposed in the first screw hole. The end of the first screw 1133 extends through the side wall of the oven 40 of the stretching apparatus and protrudes outside the oven 40. More specifically, the first drive assembly also includes a first hand wheel 1134. The first hand wheel 1134 is connected to an end of the first screw 1133. Thus, when the operator manually drives the first hand wheel 1134 to rotate, the first hand wheel 1134 drives the first screw 1133 to rotate, the first screw 1133 correspondingly pushes the first pushing block when rotating, and the first pushing block drives the first sliding seat 1132 to slide along the transverse direction relative to the first base 1131. In addition, the first driving assembly is not provided with the first hand wheel 1134, but is provided with a motor, the motor is connected with the first screw 1133, and the motor drives the first screw 1133 to rotate, so that the automation degree is high, and an operator does not need to manually adjust the distance between the two first rails 111.

It should be noted that the first driving assembly mainly provides power to push the first slide 1132 to slide relative to the first base 1131, and the first driving assembly is not limited to adopt the form of the above-mentioned screw rod, and may also adopt, for example, an air cylinder pushing mechanism, an oil cylinder pushing mechanism, a motor screw rod driving mechanism, a gear driving mechanism, etc., which are not limited herein and may be set according to actual situations.

Referring to fig. 2, in one embodiment, the first seat plate 112 is provided with a reinforcing block 114. The reinforcing blocks 114 are located between the two first rails 111 and are connected to the two first rails 111, respectively. Thus, the reinforcing block 114 can increase the stability of the two first rails 111 being mounted on the first seat plate 112, and the first rails 111 are not easily deformed by stress, so that the stability of the driving chain clamp 20 running on the anchoring section 11 can be ensured.

Referring to fig. 2 and 3, in one embodiment, when the anchoring section 11 is located in the preheating section L₁End part and stretch section L of₂The head end part of the steel pipe; the anchoring section 11 includes two first rails 111 disposed on the bracket at opposite intervals, and the first rails 111 are arc-shaped or zigzag-shaped. Thus, when the first rail 111 is curved, the preheating section L₁Smoothly transits to the tension section L through the anchor section 11₂The stability of the driving chain clamp 20 running on the anchoring road section 11 can be ensured, and the preheating section L is realized₁Enters the stretching section L₂。

Referring to fig. 2 and 3, in one embodiment, the anchoring section 11 includes two first rails 111 disposed on the bracket at intervals. The first rail 111 is a rigid member. Specifically, the first rail 111 includes, but is not limited to, metal members such as iron, copper, carbon steel, and the like, and may also be a hard non-metal member that is resistant to high temperature. The two first rails 111 respectively constitute a part of the inner side rail 101 and a part of the outer side rail 102. When the driving chain clamp 20 moves through the two first rails 111, the first rails 111 are hard enough and are not easy to deform under stress, so that the operation stability of the driving chain clamp 20 is greatly improved, and the driving chain clamp 20 can be guided with high precision.

Referring to fig. 2 to 4, fig. 4 is a schematic structural diagram illustrating the moving section 12 in fig. 1, and in one embodiment, the moving section 12 includes two second rails 121 disposed on a bracket at an interval. The second rail 121 is an elastic member. The two second rails 121 are connected to the two first rails 111, respectively. In this way, one of the second rails 121 of the moving section 12 is connected in series with one of the first rails 111 of the anchoring section 11 to combine the inner rails 101 of the circular track 10, and the other second rail 121 of the moving section 12 is connected in series with the other first rail 111 of the anchoring section 11 to combine the outer rails 102 of the circular track 10. Wherein, because the second rail 121 is an elastic member, it can be elastically deformed to compensate for the change of the length thereof during the pushing process along the transverse direction. Specifically, the elastic member includes, but is not limited to, an elastic metal plate, and an elastic non-metal plate resistant to high temperature.

Referring to fig. 2 to 4, in one embodiment, the anchoring section 11 includes two first rails 111 disposed on the bracket at intervals. The two first rails 111 are arranged parallel to each other. Thus, the distance between the two first rails 111 is always constant from front to back, and when the driving chain clamp 20 runs on the anchoring section 11, the distance between two adjacent clamps of the driving chain clamp 20 is always constant, that is, the film 30 is not stretched in the longitudinal direction; in other words, the film 30 is run through the stretching section L₂During the process, the stretching in the longitudinal direction is relatively retarded. Further, as the drive chain clamp 20 travels through the anchor section 11, at the tension section L₂The starting point position (as shown in fig. 3 a) of the film stretching device has only a transverse stretching force, and can transversely stretch the film 30, but does not have a longitudinal stretching force, so that the film stretching device has a relieving effect, can run more stably and reliably, and can ensure the stretching quality of the film 30. When the driving chain clamp 20 runs to the synchronous stretching section L₂₂At the starting point position (B shown in fig. 3), not only the transverse stretching force but also the longitudinal stretching force is present, and the longitudinal and transverse biaxial stretching of the film 30 is realized.

Therefore, it is equivalent to pullExtension section L₂Divided into pre-transverse-pulling sections L connected in series along the longitudinal direction₂₁And synchronous stretching section L₂₂. The driving chain clamp 20 firstly clamps the film 30 and moves to the pre-transverse pulling section L₂₁The film 30 is pre-stretched transversely and then the film 30 is clamped to move to the synchronous stretching section L₂₂The film 30 is stretched in both directions. The film 30 heated to the process temperature is transversely stretched in a small range, so that the rail mechanism forms enough and stable transverse stretching force on the film 30 in the transverse direction, then longitudinal stretching is started (namely synchronous stretching is carried out formally), and the film 30 finally reaches the required stretching multiplying power in the transverse direction and the longitudinal direction, so that the existing defects of the synchronous stretching technology of the film 30 can be effectively overcome, the deformation caused by the difference of the physical characteristics of the side part and the middle part of the film 30 is relieved, the stretching quality of the film 30 can be greatly improved, and the bow-shaped defect of the film 30 is avoided.

Referring to fig. 2 to 4, in one embodiment, the moving section 12 includes: two second rails 121 arranged on the bracket at intervals oppositely, and two second seat plates 122 connected with the two second rails 121 in a one-to-one correspondence manner, wherein the two second seat plates 122 can be movably arranged on the bracket along the longitudinal direction; and a second moving assembly respectively connected to the two second seat plates 122 for driving the two second seat plates 122 to move in the transverse direction. Thus, after the second moving assembly drives the two second seat plates 122 to move along the transverse direction, the distance between the two moving sections 12 can be adjusted, and thus the stretching amount of the film 30 along the transverse direction can be correspondingly adjusted when the driving chain clamp 20 runs on the moving sections 12, so as to adjust the transverse stretching ratio.

Referring to fig. 2 to 4, in detail, the second moving assembly includes a second base 123 fixedly disposed on the bracket, a second sliding base 124 movably disposed on the second base 123 along the transverse direction, and a second driving assembly connected to the second sliding base 124. Hinge shafts 1221 (shown by dotted lines in fig. 4) are disposed at the middle portions of the two second seat plates 122, waist-shaped holes 1241 (shown by dotted lines in fig. 4) corresponding to the hinge shafts 1221 are disposed on the second slide carriage 124, the waist-shaped holes 1241 are disposed along the longitudinal direction, and the hinge shafts 1221 penetrate through the waist-shaped holes 1241 and can move along the waist-shaped holes 1241. Thus, on the one hand, the second driving assembly drives the second sliding seat 124 to move on the second base 123 along the transverse direction, and when the second sliding seat 124 moves, the two second seat plates 122 are correspondingly driven to move along the transverse direction through the hinge shaft 1221, so that the distance between the two oppositely arranged moving sections 12 can be adjusted; on the other hand, since the hinge shaft 1221 of the second seat plate 122 is disposed in the slotted hole 1241, i.e. can move along the slotted hole 1241, the second seat plate 122 can be movably disposed on the bracket along the longitudinal direction, so as to meet and compensate for the length variation of the circular track 10.

Referring to fig. 2 to 4, in particular, the second driving assembly includes a second screw 125 and a second pushing block (not shown). The second pushing block is connected to the second sliding base 124, and a second screw hole corresponding to the second screw 125 is formed in the second pushing block. The second screw 125 is disposed in the second screw hole. The end of the second screw 125 extends through the oven 40 side wall of the stretching assembly and out of the oven 40. More specifically, the second drive assembly further includes a second hand wheel 126. The second wheel 126 is connected to the end of the second screw 125. Thus, when the operator manually drives the second handwheel 126 to rotate, the second handwheel 126 drives the second screw 125 to rotate, and when the second screw 125 rotates, the second pushing block is correspondingly pushed, and the second pushing block drives the second sliding seat 124 to slide along the transverse direction relative to the second base 123. In addition, the second driving assembly is not provided with the second hand wheel 126, but is provided with a motor, the motor is connected with the second screw rod 125, and the motor drives the second screw rod 125 to rotate, so that the degree of automation is high, and the distance between the two second rails 121 does not need to be adjusted manually by an operator.

Referring to fig. 2 to 4, in one embodiment, the moving section 12 further includes a third driving component. The third driving assembly is connected to one of the second rails 121 and is used to drive the one of the second rails 121 to move closer to or away from the other second rail 121. In this way, under the driving action of the third driving assembly, the distance between the two second rails 121 can be changed, so that the stretching amount of the film 30 along the longitudinal direction can be correspondingly adjusted, and the longitudinal stretching ratio can be adjusted.

Referring to fig. 2 to 4, in detail, the second slide carriage 124 is provided with a fixed plate 1242 and a sliding plate 1243 slidably disposed on the second slide carriage 124 along the transverse direction, wherein a waist-shaped hole 1241 is opened on the sliding plate 1243. The third drive assembly includes a third screw 127. The sliding plate 1243 is provided with a third screw hole corresponding to the third screw 127, and the third screw 127 is installed in the third screw hole. The end of the third screw 127 extends through the oven 40 side wall of the stretching assembly and out of the oven 40. More specifically, the third drive assembly also includes a third hand wheel 128. The third hand wheel 128 is connected to the end of the third screw 127. Therefore, when the operator manually drives the third hand wheel 128 to rotate, the third hand wheel 128 drives the third screw 127 to rotate, and when the third screw 127 rotates, the third pushing block is correspondingly pushed to move, and the third pushing block drives the third sliding seat to slide along the transverse direction relative to the third base. In addition, the third driving assembly is not provided with the third hand wheel 128, but is provided with a motor, the motor is connected with the third screw 127, and the motor drives the third screw 127 to rotate, so that the automation degree is high, and an operator does not need to manually adjust the distance between the two second rails 121.

It should be noted that the stretching apparatus for improving the synchronization of the film in the stretching start section further includes an oven 40 disposed outside the two endless tracks 10. The oven 40 can provide a preset temperature environment required by processing for the film 30, and ensure that the film 30 completes preheating, stretching, shaping, cooling and other treatments under the preset temperature environment. The opposite ends of the oven 40 are respectively provided with an inlet and an outlet, the film 30 enters the oven 40 through the inlet, and is finally output through the outlet after processing.

Referring to fig. 1 and 5, fig. 5 is a schematic structural diagram of the stretch link section 13 in fig. 1. In one embodiment, each circular track 10 is provided with a telescopic section 13 corresponding to the entrance of the oven 40 and the exit of the oven 40. Thus, under the condition that the annular track 10 is repeatedly subjected to longitudinal and transverse stretching ratio adjustment and high-temperature thermal expansion, the telescopic section 13 can adaptively change the length, and the requirement of the annular track 10 for stretching ratio adjustment or compensation due to high-temperature thermal expansion can be met only by stepless adjustment, so that the transmission chain clamp 20 can still be stably guided when the length of the annular track is changed.

In one embodiment, the telescopic section 13 includes two third rails 131 disposed at an opposite interval, and the length of the third rails 131 in the longitudinal direction is adjustable. The third rail 131 includes, but is not limited to, two moving rails 1311 slidably coupled to each other in a longitudinal direction.

Referring to FIG. 1, in one embodiment, the circular track 10 is further provided with a shaped section L₃And a cooling section L₄. Preheating stage L₁Stretching section L₂And a shaping section L₃Cooling section L₄And is connected with the return segment P in sequence. In this embodiment, the preheating section L of one of the endless tracks 10₁Stretching section L₂And a shaping section L₃And a cooling section L₄With a preheating section L of another endless track 10₁Stretching section L₂And a shaping section L₃And a cooling section L₄The positions correspond one to one.

Furthermore, two preheating stages L₁Is defined as D₁At a distance D₁In the direction of travel along the film 30. The drive chain gripper 20 operates in the preheating section L₁The distance between two adjacent clamps in the process is kept constant along the running direction of the film 30. Thus, as the film 30 travels through the preheating section L₁At this time, the film 30 is not transversely stretched, but the temperature of the film 30 is heated to a predetermined temperature.

Two stretching sections L₂The spacing therebetween is defined as D₂At a distance D₂With an increasing trend in the direction of travel along the film 30. I.e. the drive chain clamp 20 runs in the stretch section L₂Transverse stretching (e.g., y-axis in fig. 1) of film 30 can be achieved.

Two shaping sections L₃The spacing therebetween is defined as D₃At a distance D₃In a decreasing trend or constant along the running direction of the film 30. The driving chain clamp 20 runs in the shaping section L₃The distance between two adjacent clamps in the process tends to decrease or remain constant along the running direction of the film 30.

Two cooling sections L₄Is defined as D₄At a distance D₄In the direction of travel along the film 30. The drive chain clamp 20 operates in the cooling section L₄The distance between two adjacent clamps in the process is kept constant along the running direction of the film 30. Thus, as the film 30 travels through the cooling section L₄At this time, the film 30 is not transversely stretched, but the temperature of the film 30 is cooled to a predetermined temperature.

Referring to fig. 1, in one embodiment, the stretching apparatus for improving the synchronization of the film in the stretching start section further includes two driving mechanisms disposed on the frame. One of the driving mechanisms is connected to one of the driving chain clamps 20 for driving one of the driving chain clamps 20 to travel along one of the endless tracks 10; another drive mechanism is connected to the other drive chain gripper 20 for driving the other drive chain gripper 20 along the other endless track 10.

Specifically, each of the driving mechanisms is, for example, two, three, four or another number of driving chain disks 50 disposed on the bracket, and the driving chain clamp 20 is driven to run along the endless track 10 by the driving chain disks 50. Of course, the driving mechanism may be one, two or another number of magnetic mechanisms by which the driving chain clamp 20 is driven to travel along the endless track 10.

Referring to fig. 1, in one embodiment, the stretching apparatus for improving the synchronization of the film in the stretching start section further includes two inlet platforms 61 and two outlet platforms 62 disposed on the support. One of the entrance platforms 61 and one of the exit platforms 62 is for mounting one of the endless tracks 10, and the other entrance platform 61 and the other exit platform 62 is for mounting the other endless track 10. The inlet platform 61 is provided with a first driving chain disc and a third driving chain disc, and the outlet platform 62 is provided with a second driving chain disc and a fourth driving chain disc.

In addition, the specific rotation speeds of the second driving chain disc and the first driving chain disc are set according to the longitudinal stretching ratio of the film 30, for example, the longitudinal stretching ratio is set to 10, the rotation speed of the first driving chain disc is 1m/s, and then the rotation speed of the second driving chain disc is correspondingly controlled to 10 m/s. In this way, in order to ensure that the transmission chain clip 20 is always in the extended state in the return segment P, the inlet platform 61 is provided with not only the first driving chain disc, but also the third driving chain disc and the fourth driving chain disc, which can enable the transmission chain clip 20 in the return segment P to keep the preset speed, i.e. the speed of the transmission chain clip 20 in the return segment P is kept constant, and the transmission chain clip 20 in the return segment P is in the extended state.

It can be understood that the two driving chain clamps 20 respectively apply force to the two side edges of the film 30, so as to realize the transverse stretching and the longitudinal stretching of the film 30. In order to achieve the stretching uniformity of the transverse stretching and the longitudinal stretching of the film 30, the two inlet platforms 61, the two outlet platforms 62, the two endless tracks 10, and the two driving chain clamps 20 are all designed to be symmetrical with respect to the running direction of the film 30. In addition, the first drive chain disks on the two inlet platforms 61 are designed to be symmetrical with respect to the running direction of the film 30, the third drive chain disks on the two inlet platforms 61 are designed to be symmetrical with respect to the running direction of the film 30, the second drive chain disks on the two outlet platforms 62 are designed to be symmetrical with respect to the running direction of the film 30, and the fourth drive chain disks on the two outlet platforms 62 are designed to be symmetrical with respect to the running direction of the film 30.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims

1. A stretching apparatus for improving synchronism of a film in a stretching start section, comprising:

the device comprises a support, two annular rails and two transmission chain clamps, wherein the two annular rails are arranged on the support, and the two transmission chain clamps are correspondingly arranged on the two annular rails one by one; the annular track comprises a preheating section, a stretching section and a return section which are connected in sequence; the preheating section and the stretching section of one of the annular rails are arranged opposite to the preheating section and the stretching section of the other annular rail; the track formed by combining the preheating section and the stretching section comprises an anchoring section and at least two moving sections connected with the anchoring section, the anchoring section is relatively and fixedly arranged on the bracket along the forward moving direction of the film, and the anchoring section is positioned at the tail end part of the preheating section and/or the head end part of the stretching section; the moving section is movably arranged on the bracket along the forward running direction of the film.

2. The stretching apparatus for improving the synchronism of a film in the stretching start section as claimed in claim 1, wherein the anchoring section comprises two first rails disposed on the frame at a relative interval, and a first seat plate connecting the two first rails, the first seat plate being movably disposed on the frame in the transverse direction; the anchor section further includes a first movement assembly for driving the first seat pan to move along the lateral direction.

3. The stretching apparatus as claimed in claim 2, wherein said first moving assembly comprises a first base fixedly disposed on said frame, a first slide movably disposed on said first base along said transverse direction, a first driving assembly connected to said first slide, and said first seat plate fixedly disposed on said first slide.

4. The stretching apparatus for improving the synchronization of the film in the stretching start section as claimed in claim 2, wherein said first base plate is provided with a reinforcing block, said reinforcing block being located between and connected to said two first rails, respectively.

5. The stretching apparatus for improving the synchronism of a film in the stretching start section as claimed in claim 1, wherein when said anchor section is located at a terminal portion of said preheating section and a head portion of said stretching section; the anchoring section comprises two first rails which are arranged on the support at intervals, and the first rails are arc-shaped or folded.

6. The stretching apparatus for improving the synchronism of a film in the stretching start section as claimed in claim 1, wherein the anchoring section comprises two first rails disposed on the support at a relative interval; the first rail is a hard piece.

7. The stretching apparatus for improving the synchronism of a film in the stretching start section as claimed in claim 6, wherein the moving section comprises two second rails disposed on the frame at a relative interval; the second rail is an elastic piece; the two second rails are correspondingly connected with the two first rails.

8. The stretching apparatus for improving the synchronism of a film in the stretching start section as claimed in claim 1, wherein the anchoring section comprises two first rails disposed on the support at a relative interval; the two first rails are arranged in parallel with each other.

9. The stretching apparatus for improving the synchronism of a film in a stretching start section as claimed in claim 1, wherein said moving section comprises:

the two second seat plates are correspondingly connected with the two second rails one by one, and both the two second seat plates can be movably arranged on the bracket along the forward running direction of the film;

and the second moving assemblies are respectively connected with the two second seat plates and are used for driving the two second seat plates to move along the transverse direction.

10. The stretching apparatus for improving the synchronism of a film in the stretching initial stage according to any one of claims 1 to 9, wherein each of the endless tracks is provided with a stretch section corresponding to each of the oven entrance portion and the oven exit portion.