CN116945566A - Film clamping mechanism with variable clamping rate and film stretching device - Google Patents
Film clamping mechanism with variable clamping rate and film stretching device Download PDFInfo
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- CN116945566A CN116945566A CN202310988595.5A CN202310988595A CN116945566A CN 116945566 A CN116945566 A CN 116945566A CN 202310988595 A CN202310988595 A CN 202310988595A CN 116945566 A CN116945566 A CN 116945566A
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- 230000007246 mechanism Effects 0.000 title claims abstract description 87
- 230000005540 biological transmission Effects 0.000 claims abstract description 7
- 238000009423 ventilation Methods 0.000 claims description 35
- 238000009998 heat setting Methods 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 18
- 238000012797 qualification Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 8
- 230000001360 synchronised effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003578 releasing effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/20—Edge clamps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The application relates to a film clamping mechanism with variable clamping rate and a film stretching device. The driving chain clamp is provided with a plurality of clamping unit groups which are sequentially arranged along the longitudinal direction. Each clamping unit group comprises a first clamping jaw and a second clamping jaw which are arranged along the longitudinal direction. The longitudinal clamping length of the first clamping jaw is set to be N 1 The longitudinal clamping length of the second clamping jaw is set to be N 2 ，N 1 >N 2 . When the transmission chain clamps the film and moves to the clamping opening position of the first clamping opening mechanism, the first clamping jaw which moves to the clamping opening position is driven by the first clamping opening mechanism to open, and the second clamping jaw is kept to be closed, so that the longitudinal clamping rate of the film can be instantaneously reduced, the uniformity of the whole width of the film can be improved, and the product qualification rate of the film is improved. In addition, as each clamping unit group still has the second clamping jaw to clamp and fix the film, namely the film is clamped at a plurality of positions along the longitudinal direction, the operation stability is good, and the forward operation of the film is easier to control.
Description
Technical Field
The application relates to the technical field of film stretching, in particular to a film clamping mechanism with variable clamping rate and a film stretching device.
Background
With the development of film stretching technology, the stretching mode of the film tends to be changed from a two-step stretching mode to a synchronous stretching mode. The clamping and releasing actions of the transmission chain clamp on the film are carried out on the rails outside the oven, and the film is sequentially subjected to preheating, stretching, shaping, cooling and other process treatments after entering the stretching oven, so that the rails keep clamping states on the edges of the two sides of the film along the clamping jaws to meet the requirements of the stretching process.
After the film is transversely stretched in the oven, the distance between adjacent chain clamps can be changed in the following functional section, so that the film realizes the longitudinal relaxation or the bidirectional synchronous stretching process. Such as: the longitudinal relaxation technology is that the tail section of the transverse stretching section is connected with the head section of the heat setting section, and the distance between adjacent chain clamps entering the heat setting section is reduced to realize the longitudinal relaxation function of the film; another example is: the mixed stretching technology is that the tail section of the transverse stretching section is connected with the head section of synchronous stretching, and the distance between adjacent chain clamps after entering synchronous stretching is increased, so that the synchronous stretching function of the film in the longitudinal and transverse directions is realized.
In the related art, the transverse stretching process of the film requires that the chain is clamped along the line to fasten and clamp most of the two side edges of the film, namely, the longitudinal clamping rate is generally over 80 percent, so that the defects of serious distortion, influence on the yield and film breakage of the edge of the film during the transverse stretching treatment can be prevented, but a large number of experiments show that the uniformity of the side area of the film is poorer along the longitudinal direction after the subsequent treatment procedures of loosening or stretching the whole width of the film is worse, and the uniformity of the side area of the film is poorer and more obvious.
Disclosure of Invention
Based on the above, it is necessary to overcome the defects of the prior art, and to provide a film clamping mechanism and a film stretching device with variable clamping rate, which can improve the uniformity of the whole wide width of the film and the product qualification rate of the film.
A variable grip rate film gripping mechanism, the variable grip rate film gripping mechanism comprising:
the chain clamp is provided with a plurality of clamping unit groups which are sequentially arranged along the longitudinal direction, each clamping unit group comprises a first clamping jaw and a second clamping jaw which are arranged along the longitudinal direction, and the first clamping jaw is provided with a plurality of clamping units which are sequentially arranged along the longitudinal directionThe longitudinal clamping length of a clamping jaw is set to N 1 The longitudinal clamping length of the second clamping jaw is set to be N 2 ，N 1 >N 2 The first clamping jaw and the second clamping jaw are respectively opened and closed independently; and
The first clamping opening mechanism is arranged adjacent to the transmission chain clamp and used for driving the first clamping jaw to open.
In one embodiment, N 2 Is 0.2N 1 To 0.9N 1 。
In one embodiment, the first clip opening mechanism includes a clip opening member attached to a bracket; each clamping unit group further comprises a clamping seat, the first clamping jaw and the second clamping jaw are rotatably connected to the clamping seat, and the first clamping jaw and the second clamping jaw are respectively provided with an opening position for respectively rotating to loosen the side part of the film and a clamping position for clamping the side part of the film; the first clamping jaw is provided with a driving part which is mutually in abutting fit with the clamping opening part, and the driving part can correspondingly drive the first clamping jaw to rotate to an opening position when running through the clamping opening part; the second clamping jaw is provided with an avoidance part which is mutually avoided with the opening clamping component.
In one embodiment, the clamping opening part is a rotating disc rotatably connected to the bracket; or, the clamping opening component is a wedge-shaped abutting part arranged on the bracket, and the wedge-shaped abutting part is provided with a guide inclined plane for mutually abutting and matching with the driving part.
In one embodiment, the clamping seat of each clamping unit group is one, and the first clamping jaw and the second clamping jaw are rotatably connected to the same clamping seat; or, two clamping seats of each clamping unit group are provided, and the first clamping jaw and the second clamping jaw are respectively and rotatably connected to the two clamping seats.
In one embodiment, the clamping surface of the first clamping jaw is provided with at least one first ventilation groove extending along the transverse direction; and/or at least one second ventilation groove extending along the transverse direction is formed on the supporting surface of the clamping seat.
In one embodiment, the first ventilation grooves are arranged in a plurality, and the first ventilation grooves are sequentially arranged at intervals along the longitudinal direction; the plurality of second ventilation grooves are arranged at intervals in sequence along the longitudinal direction; each first ventilation groove corresponds to the position of each second ventilation groove.
The film stretching device comprises two film clamping mechanisms, an oven, a bracket and two annular tracks; the support is connected with the oven, the two annular tracks are arranged on the support, the two transmission chain clamps are arranged on the two annular tracks in a one-to-one correspondence manner, and the two first clamping opening mechanisms are connected to the support and are positioned in the oven; the oven is provided with an inlet and an outlet which are oppositely arranged, and the annular track is transmitted into the oven from the inlet and passes out of the oven from the outlet; the annular track comprises a preheating section, a stretching section, a heat setting section and a cooling section which are sequentially arranged along the longitudinal direction; the clamping opening position of the first clamping opening mechanism is positioned at the stretching section and/or the heat setting section.
In one embodiment, two of the first opening mechanisms are symmetrically arranged about the longitudinal direction.
In one embodiment, the film stretching device further comprises two closing and clamping mechanisms and two second opening and clamping mechanisms; the two closing clamp mechanisms are respectively arranged corresponding to the two driving chain clamps and are positioned at the inlet, and the two second opening clamp mechanisms are respectively arranged corresponding to the two driving chain clamps and are positioned at the outlet.
According to the film clamping mechanism and the film stretching device with the variable clamping rate, when the transmission chain clamps the film and move to the clamping opening position of the first clamping opening mechanism, under the driving of the first clamping opening mechanism, the first clamping jaw which moves to the clamping opening position can be driven to be opened, the second clamping jaw is kept to be closed, the longitudinal clamping rate of the film can be instantly reduced, the uniformity of the whole width of the film can be improved, and the product qualification rate of the film is improved. In addition, as each clamping unit group still has the second clamping jaw to clamp and fix the film, namely the film is clamped at a plurality of positions along the longitudinal direction, the operation stability is good, and the forward operation of the film is easier to control.
Drawings
Fig. 1 is a simplified block diagram of a film stretching apparatus according to an embodiment of the present application.
Fig. 2 is an enlarged schematic view of the structure at a in fig. 1.
Fig. 3 is an enlarged schematic view of the structure of fig. 2 at B.
Fig. 4 is another view block diagram of the structure shown in fig. 2.
Fig. 5 is an enlarged schematic view of the structure of fig. 4 at C.
FIG. 6 is a schematic diagram of a variable clamping rate film clamping mechanism according to an embodiment of the application.
Fig. 7 is an enlarged schematic view of the structure of fig. 6 at D.
10. A film clamping mechanism; 11. a drive chain clip; 111. a clamping unit group; 1111. a first jaw; 1112. a second jaw; 1113. a clamping seat; 1114. a driving section; 1115. a first ventilation slot; 1116. a second ventilation slot; 12. a first clip opening mechanism; 20. an oven; 30. an endless track; 31. a preheating section; 32. a stretching section; 33. a heat setting section; 34. a cooling section; 40. a clamping mechanism; 50. a second clip opening mechanism; 60. a film.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.
As described in the background art, the worse the uniformity of the whole width of the film in the longitudinal direction after the subsequent processing procedure of relaxation or stretching is, the more obvious the problem is that the uniformity of the side region of the film is worse, and the inventor finds that the higher the longitudinal clamping rate is, the more the edge amount of the film is rigidly locked by the chain clamp along the line, the smaller the edge amount of the film is between the two closing clamping jaws, so that the worse the uniformity of the whole width of the film in the longitudinal direction after the subsequent processing procedure of relaxation or stretching is, especially the region near the side.
Based on the reasons, the application provides the film clamping mechanism and the film stretching device with the variable clamping rate, which can improve the uniformity of the whole wide width of the film and improve the product qualification rate scheme of the film.
Referring to fig. 1 to 6, fig. 1 shows a simplified block diagram of a film stretching apparatus according to an embodiment of the present application. Fig. 2 shows an enlarged schematic view of the structure of fig. 1 at a. Fig. 3 shows an enlarged schematic view of the structure of fig. 2 at B. Fig. 4 shows another view block diagram of the structure shown in fig. 2. Fig. 5 shows an enlarged schematic view of the structure of fig. 4 at C. Fig. 6 shows a schematic structural diagram of a variable gripping rate film gripping mechanism 10 according to an embodiment of the present application. Fig. 7 shows an enlarged schematic view of the structure of fig. 6 at D. In one embodiment of the present application, a variable gripping rate film gripping mechanism 10 is provided, where the variable gripping rate film gripping mechanism 10 includes: the chain clip 11 and the first clip opening mechanism 12. The chain clip 11 is provided with a plurality of clamping unit groups 111 arranged in sequence in the longitudinal direction. Each clamping unit group 111 comprises a first clamping jaw 1111 and a second clamping jaw 1112 arranged in a longitudinal direction. As shown in fig. 7, the longitudinal holding length of the first clamping jaw 1111 is set to N 1 The longitudinal clamping length of the second clamping jaw 1112 is set to N 2 ，N 1 >N 2 . The first jaw 1111 and the second jaw 1112 open and close independently of each other. The first opening mechanism 12 is disposed adjacent to the chain clip 11, and the first opening mechanism 12 is configured to drive the first clamping jaw 1111 to open.
The longitudinal clamping rate in this embodiment refers to, for example, a length of N 3 In the film 60 of (2), the sum of the lengths of the portions sandwiched by the respective holding jaws in the longitudinal direction is N 4 ，N 4 /N 3 I.e. longitudinal clampingAnd (3) a rate K. Wherein after a part of the clamping jaws of the clamping film 60 are opened, N 4 The longitudinal clamping rate K decreases accordingly.
Furthermore, the longitudinal direction refers to the running direction of the film 60, in other words, the length direction of the film 60, i.e., the direction shown by the X-axis in fig. 1; the lateral direction refers to a direction perpendicular to the running direction of the film 60 and parallel to the surface of the film 60, in other words, the width direction of the film 60, that is, a direction shown as the Y-axis in fig. 1.
It should be further noted that the specific position of the first clamping mechanism 12 includes, but is not limited to, being set on the stretching section 32 and/or the heat setting section 33, and may be specifically and flexibly adjusted and set according to actual requirements.
Specifically, for applications of longitudinal relaxation transverse stretching techniques, the first clamping mechanism 12 may be disposed on the heat-setting section 33, specifically, for example, at the front end of the heat-setting section 33, to promote overall width uniformity of the film 60 during the relaxation heat treatment process; in addition, for the application of the hybrid stretching technique of pre-transverse stretching and bi-directional synchronous stretching, the first clamping opening mechanism 12 is arranged on the stretching section 32, specifically for example, at the critical position of the transverse stretching section 32 and the synchronous stretching section 32, so that the longitudinal uniformity of the film 60 in the synchronous stretching process is improved, and the risk of overstretching in the side area of the film 60 is reduced. Of course, the first clamping mechanism 12 may be located at other locations and used in a variety of other applications, and may be suitably located based on different materials of the film 60 and different process conditions.
In the film clamping mechanism 10 with variable clamping rate, when the driving chain clamp 11 clamps the film 60 and moves to the clamping opening position of the first clamping opening mechanism 12, the first clamping jaw 1111 driven to move to the clamping opening position can be opened by the driving of the first clamping opening mechanism 12, and the second clamping jaw 1112 is kept closed, so that the longitudinal clamping rate of the film 60 can be instantaneously reduced, the uniformity of the whole width of the film 60 can be improved, and the product percent of pass of the film 60 can be improved. In addition, since each clamping unit group 111 still has the second clamping jaw 1112 to clamp the fixed film 60, that is, the film 60 is clamped at a plurality of positions along the longitudinal direction, the operation stability is good, and the forward operation of the film 60 is easier to control.
Referring to FIGS. 6 and 7, in one embodiment, N 2 Is 0.2N 1 To 0.9N 1 . Alternatively, N 2 Is 0.2N 1 、0.4N 1 、0.5N 1 、0.6N 1 、0.7N 1 、0.8N 1 、0.9N 1 And the like, and particularly can be flexibly adjusted and set according to actual requirements.
The first clamping mechanism 12 may be provided in various forms, including, but not limited to, a pressing mechanism, a toggle mechanism, a magnetic mechanism, etc. for driving the clamping arm of the first clamping jaw 1111 to rotate, so long as the clamping operation of the first clamping jaw 1111 in the driving chain clamp 11 can be driven.
In one embodiment, the first clip opening mechanism 12 includes a clip opening member attached to a bracket. Each clamping unit set 111 further includes a clamping seat 1113. The first clamping jaw 1111 and the second clamping jaw 1112 are rotatably connected to the clamping seat 1113, and the first clamping jaw 1111 and the second clamping jaw 1112 are respectively provided with an open position for respectively rotating to release the side of the film 60 and a clamping position for clamping the side of the film 60. The first clamping jaw 1111 is provided with a driving portion 1114 in abutting engagement with the clamping opening member, the driving portion 1114 being capable of correspondingly driving the first clamping jaw 1111 to rotate to the open position when moving past the clamping opening member. The second jaw 1112 is provided with a relief portion that is relieved from the clamping members. In this way, the first clamping jaw 1111 will perform the clamping opening operation when moving past the first clamping opening mechanism 12, and the second clamping jaw 1112 will be able to avoid the clamping opening member and remain in the clamping position when moving past the first clamping opening mechanism 12.
Specifically, the opening clamp member flexibly sets and adjusts its position according to the arrangement position of the first clamping jaw 1111, for example, is located right above the driving chain clamp, so that it can be conveniently abutted against the driving portion 1114 on the first clamping jaw 1111 to drive the first clamping jaw 1111 to perform the opening clamp action.
In some embodiments, driver 1114 includes, but is not limited to, various forms configured as bumps, posts, bumps, or the like. Further, the "driver 1114" may be "a portion of the first jaw 1111", i.e. "driver 1114" is integrally manufactured with "other portions of the first jaw 1111"; or may be a separate component from the other portions of the first jaw 1111, i.e., the driver 1114 may be manufactured separately and then integrated with the other portions of the first jaw 1111.
In one embodiment, the clip opening member is a rotatable disc rotatably coupled to the bracket (as shown in fig. 5 or 6). Alternatively, the clip opening member is a wedge-shaped abutting portion (not shown) provided on the bracket, and the wedge-shaped abutting portion is provided with a guide slope for abutting engagement with the driving portion 1114.
Referring to fig. 5 and 6, in one embodiment, the clamping seat 1113 of each clamping unit set 111 is configured as one, and the first clamping jaw 1111 and the second clamping jaw 1112 are rotatably connected to the same clamping seat 1113. Alternatively, two clamping holders 1113 are provided for each clamping unit set 111, and the first clamping jaw 1111 and the second clamping jaw 1112 are respectively rotatably connected to the two clamping holders 1113. For each clamping unit group 111, the number of clamping holders 1113 is one, and the longitudinal length of the clamping holders 1113 is increased compared with the number of clamping holders 1113, so that a set of accessories such as bearings and chain links is adopted, thereby improving stability and reducing cost.
As an alternative, each clamping unit set 111 is provided with not only the first clamping jaw 1111 and the second clamping jaw 1112, but also, for example, other clamping jaws, which can be specifically selected and adjusted according to actual requirements.
In the related art, when the film 60 is clamped for processing, the clamping surface of the clamping jaw and the supporting surface of the clamping seat 1113 are respectively contacted with the front side and the back side of the film 60, and heat is transferred to the side of the film 60 in a metal heat conduction mode, compared with the mode that other parts of the film 60 are directly conducted by hot air, the side part of the film 60 is slower in heating speed and easy to generate serious distortion.
Referring to fig. 6 and 7, in one embodiment, at least one first ventilation groove 1115 extending in a transverse direction is formed on a clamping surface of the first clamping jaw 1111; and/or, at least one second ventilation groove 1116 extending along the transverse direction is formed on the supporting surface of the clamping seat 1113. In this way, when the film clamping mechanism 10 clamps the side portion of the film 60, the first ventilation groove 1115 on the clamping surface of the first clamping jaw 1111 and/or the second ventilation groove 1116 on the supporting surface of the clamping seat 1113 do not contact the film 60, so that the hot air flowing in the first ventilation groove 1115 and/or the second ventilation groove 1116 can directly act on the side portion of the film 60, the heating effect of the side portion of the film 60 can be improved, the uniformity of the film 60 can be improved, and the processing quality of the film 60 can be improved.
Referring to fig. 6 and 7, in one embodiment, the first ventilation slots 1115 are provided in a plurality, and the plurality of first ventilation slots 1115 are sequentially spaced apart along the longitudinal direction. The second ventilation grooves 1116 are provided in plurality, and the plurality of second ventilation grooves 1116 are sequentially arranged at intervals in the longitudinal direction. Specifically, each first ventilation groove 1115 corresponds to the position of each second ventilation groove 1116.
Referring to fig. 6 and 7, in some embodiments, the cross sections of the first ventilation slots 1115 and the second ventilation slots 1116 along the transverse direction include, but are not limited to, regular shapes such as polygonal, semicircular, and semi-elliptical, and other irregular shapes, and may be specifically configured according to practical requirements. Wherein the polygon includes triangle, quadrangle, pentagon, etc.
Referring to fig. 6 and 7, in some embodiments, the notch shape of the first ventilation slot 1115 is identical to the notch shape of the second ventilation slot 1116, and is aligned with each other. In this way, the ventilation slot formed by combining the first ventilation slot 1115 and the second ventilation slot 1116 can facilitate the entry of hot air, and the hot air entering the ventilation slot can better contact with the side parts of the front and back surfaces of the film 60 synchronously for heat conduction.
Referring to fig. 1 to 5, in one embodiment, a film stretching apparatus includes two film clamping mechanisms 10 according to any of the above embodiments, and further includes an oven 20, a support, and two annular rails 30. The support is connected with the oven 20, and two ring rail 30 set up on the support, and two drive chain presss from both sides 11 one-to-one are located on two ring rail 30, and two first opening clamp mechanisms 12 are connected on the support and are located oven 20 inside. Oven 20 is provided with oppositely disposed inlet and outlet ports, with annular track 30 passing into oven 20 from the inlet port and out of oven 20 from the outlet port. The endless track 30 comprises a preheating section 31, a stretching section 32, a heat setting section 33 and a cooling section 34, which are arranged in this order in the longitudinal direction. The clamping position of the first clamping mechanism 12 is located in the stretching section 32 and/or the heat setting section 33.
In the film stretching device, when the driving chain clamp 11 clamps the film 60 and moves to the clamping opening position of the first clamping opening mechanism 12, under the driving of the first clamping opening mechanism 12, the first clamping jaw 1111 driven to move to the clamping opening position can be opened, and the second clamping jaw 1112 is kept closed, so that the longitudinal clamping rate of the film 60 can be instantaneously reduced, the uniformity of the whole width of the film 60 can be improved, and the product qualification rate of the film 60 can be improved. In addition, since each clamping unit group 111 still has the second clamping jaw 1112 to clamp the fixed film 60, that is, the film 60 is clamped at a plurality of positions along the longitudinal direction, the operation stability is good, and the forward operation of the film 60 is easier to control.
Referring to fig. 1, 5 and 6, in one embodiment, the two first clamping mechanisms 12 are symmetrically arranged about the longitudinal direction X. In this way, the two first clamping opening mechanisms 12 which are symmetrically arranged can synchronously open and clamp the first clamping jaws 1111 at the two symmetrical arrangement positions on the two opposite sides of the film 60, so that deformation in the film stretching process can be effectively prevented, and the processing quality and the qualification rate of the film 60 can be improved.
Of course, as some alternatives, the two first opening mechanisms 12 may be arranged asymmetrically. In addition, the number of the first clamping mechanisms 12 is not limited to two, but may be, for example, three, four, five, six or other numbers, and specifically may be flexibly adjusted and set according to actual requirements.
Referring to fig. 1, in one embodiment, the film stretching device further includes two closing mechanisms 40 and two second opening mechanisms 50. The two closing mechanisms 40 are respectively arranged corresponding to the two driving chain clamps 11 and are positioned at the inlet, and the two second opening mechanisms 50 are respectively arranged corresponding to the two driving chain clamps 11 and are positioned at the outlet. Thus, when the driving chain clamp 11 enters the oven 20 from the inlet, the two clamping closing mechanisms 40 synchronously perform clamping closing operation, so that all clamping jaws of the driving chain clamp 11 can be clamped on the side edges of the film 60, and then the film 60 is driven to enter the oven 20 under the action of the driving chain clamp 11, and various treatments are performed on the film 60; after the film 60 is processed, the two second clamping opening mechanisms 50 synchronously perform clamping opening operation, so that all clamping jaws of the driving chain clamp 11 are opened, and the film 60 is loosened.
Referring to FIG. 1, in one embodiment, the spacing of the two preheating sections 31 is defined as D 1 Distance D 1 Which remains unchanged along the direction of travel of the film 60. The distance between two adjacent clamping jaws of the drive chain clamp 11 during operation in the preheating section 31 remains constant in the direction of operation of the film 60. Specifically, the distance between the inner rail and the outer rail of the preheating section 31 is defined as S 1 (not shown), spacing S 1 Which remains unchanged along the direction of travel of the film 60. In this way, the film 60 can be heated to a predetermined temperature during the passing of the film 60 through the preheating section 31, but the chain clip 11 at the preheating section 31 does not perform the transverse stretching and the longitudinal stretching of the film 60.
Referring to fig. 1, in one embodiment, the annular track 30 is also provided with a return section. The preheating section 31, the stretching section 32, the heat setting section 33, the cooling section 34 and the return section are connected end to end in sequence. The spacing between the two stretching sections 32 is defined as D 2 Distance D 2 Which tends to increase in the direction of travel of the film 60. The spacing between the two heat-set sections 33 is defined as D 3 Distance D 3 In a decreasing trend or remaining unchanged along the direction of travel of the film 60. Adjacent two jaw spacings S of the drive chain clip 11 when running on the tension section 32 2 Which is constant in the direction of travel of the film 60 or which is a decreasing trend after it has been constant. The spacing between adjacent jaws of the chain clip 11 as it travels in the heat setting section 33 is reduced or maintained in the direction of travel of the film 60. Specifically, the distance between the inner rail and the outer rail of the heat-set section 33 is S 3 (not shown), spacing S 3 In an increasing direction or remaining constant along the running direction of the film 60.
Referring to FIG. 1, in one embodiment, the spacing of the two cooling segments 34 is defined as D 4 Distance D 4 Which remains unchanged along the direction of travel of the film 60. The spacing between adjacent two clamping jaws of the drive chain clamp 11 during operation in the cooling section 34 remains constant along the direction of travel of the film 60. Specifically, the spacing of the inner and outer side rails of the cooling section 34 is defined as S 4 (not shown), spacing S 4 Which remains unchanged along the direction of travel of the film 60. Thus, as the film 60 travels through the cooling section 34, the film 60 is not longitudinally stretched nor transversely stretched, but rather the temperature of the film 60 is cooled to a predetermined temperature.
Referring to fig. 1, in one embodiment, the film stretching device further includes two driving mechanisms disposed on the support. One of the drive mechanisms is coupled to one of the chain clips 11 for driving one of the chain clips 11 along one of the endless tracks 30; the other drive mechanism is connected to the other chain clip 11 for driving the other chain clip 11 along the other endless track 30.
Specifically, each drive mechanism is, for example, two, three, four or other number of drive chain discs provided on the carriage, by which the drive chain clip 11 is driven to travel along the endless track 30. Of course, the drive mechanism may also be one, two or another number of magnetic mechanisms by which the chain clip 11 is driven along the endless track 30.
In this embodiment, the preheating section 31, the stretching section 32, the heat setting section 33 and the cooling section 34 of one of the endless tracks 30 are in one-to-one correspondence with the preheating section 31, the stretching section 32, the heat setting section 33 and the cooling section 34 of the other endless track 30.
In one embodiment, the spacing of the inner rail from the outer side rail at the return section is defined as S 5 (not shown). Specifically, the spacing S 2 Distance S 3 Distance S 4 Spacing S 5 Are all smaller than the spacing S 1 。
In one embodiment, the spacing S of the inner and outer side rails at the heat-set section 33 3 For example, the fluctuation range is slightly increased, kept unchanged and not exceeded from front to backThe fluctuation range exceeding the preset value is slightly gradually reduced, and the state is kept unchanged. That is, the speed fluctuation width is small when the chain clip 11 passes over the heat setting section 33, and the chain clip 11 is substantially in an extended state.
Referring to FIG. 1, as an example, the preheating sections 31 of the two circular tracks 30 are parallel to each other, and the distance D between the two preheating sections 31 1 Remain unchanged. Likewise, the cooling sections 34 of the two annular rails 30 are also parallel to each other, the spacing D of the two cooling sections 34 4 Remain unchanged. Therefore, the film 60 is not stretched in the transverse direction in the preheating section 31 and the cooling section 34. Furthermore, the distance D between the heat-set sections 33 of the two annular rails 30 3 Gradually decreasing from front to back.
Referring to FIG. 1, as an example, the spacing S between the inner and outer side rails is at each location of the preheating section 31 of the endless track 30 1 And keep the same. In this way, the inner rail of the preheating section 31 is parallel to the outer rail, and the distance between two adjacent clamping jaws running on the preheating section 31 remains constant at all times, so that no longitudinal stretching of the film 60 takes place in the preheating section 31. And, the distance between the inner side rail and the outer side rail on the preheating section 31 is equal to the distance between the inner side rail and the outer side rail at the front end of the stretching section 32, so that the joint of the tail end of the preheating section 31 and the front end of the stretching section 32 is in smooth transition.
Referring to fig. 1, as an example, the distance between the inner side rail and the outer side rail on the head end of the heat-setting section 33 is equal to the distance between the inner side rail and the outer side rail on the tail end of the stretching section 32, so that the junction between the tail end of the stretching section 32 and the head end of the heat-setting section 33 is smoothly transited.
Referring to FIG. 1, as an example, the distance S between the inner rail and the outer rail at the front end of the cooling section 34 of the circular rail 30 4 Distance S from the inner and outer side rails at the end of the heat-set section 33 3 The same, and the spacing S of the inner and outer side rails at the cooling section 34 of the annular rail 30 described above 4 Remain unchanged at various locations.
Referring to FIG. 1, as an example, the distance S between the inner rail and the outer rail at the front end of the return section of the endless track 30 5 And cooling section34 spacing S of the inner side rail from the outer side rail at the end 4 The same, and the distance S between the inner rail and the outer rail at the return section of the circular rail 30 5 Remain unchanged at various locations. In this way, the inner rail at the return section is parallel to the outer rail, and the distance between two adjacent jaws running on the return section remains constant at all times.
Referring to fig. 1, in one embodiment, the film stretching device further includes two inlet platforms and two outlet platforms disposed on the support. One of the inlet and one of the outlet platforms is for mounting one of the annular rails 30 and the other of the inlet and other of the outlet platforms is for mounting the other of the annular rails 30. The inlet platform is provided with a first driving chain disk and a third driving chain disk, and the outlet platform is provided with a second driving chain disk and a fourth driving chain disk.
In addition, the specific rotational speeds of the second drive sprocket and the first drive sprocket are set according to the longitudinal stretching ratio of the film 60, for example, the longitudinal stretching ratio is set to 10, and the rotational speed of the first drive sprocket is set to 1m/s, and then the rotational speed of the second drive sprocket is correspondingly controlled to 10m/s. Meanwhile, in order to ensure that the driving chain clamp 11 is always in an unfolding state on the return section, the inlet platform is provided with not only the first driving chain plate, but also a third driving chain plate and a fourth driving chain plate, and the third driving chain plate and the fourth driving chain plate can realize that the driving chain clamp 11 on the return section keeps a preset speed to run, that is, the speed of the driving chain clamp 11 on the return section keeps constant, and the driving chain clamp 11 on the return section is in an unfolding state.
It will be appreciated that the two chain clips 11 apply force to the two sides of the film 60, respectively, to effect transverse stretching and longitudinal stretching of the film 60. In order to achieve the stretching uniformity of the film 60 in the transverse and longitudinal directions, the two inlet platforms, the two outlet platforms, the two endless tracks 30 and the two chain clips 11 are all symmetrical with respect to the running direction of the film 60. In addition, the first driving chain disk on the two inlet platforms is a symmetrical design structure in the running direction of the film 60, the third driving chain disk on the two inlet platforms is a symmetrical design structure in the running direction of the film 60, the second driving chain disk on the two outlet platforms is a symmetrical design structure in the running direction of the film 60, and the fourth driving chain disk on the two outlet platforms is a symmetrical design structure in the running direction of the film 60.
In one embodiment, the driving chain clip 11 may adopt a driving structure in the prior art, so long as the driving structure can realize the operation on the endless track 30, the clamping jaw of the adjacent clamping jaw is correspondingly adjusted according to the distance between the inner side rail and the outer side rail of the endless track 30, and for example, the driving chain clip comprises a first moving assembly, a second moving assembly and a connecting rod assembly. The first moving assembly and the second moving assembly are multiple. The first moving assemblies are used for being sequentially and movably arranged on the inner side rail, and the second moving assemblies are used for being sequentially and movably arranged on the outer side rail. The first moving components and the second moving components are alternately arranged. The first moving assembly comprises a first main body, and the second moving assembly comprises a second main body and clamping jaws arranged on the second main body. The connecting rod assembly is a plurality of, and connecting rod assembly corresponds to be set up between adjacent first removal subassembly and second removal subassembly, and connecting rod assembly's one end and first main part rotatable link to each other, and connecting rod assembly's the other end and second main part rotatable link to each other.
In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.
Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.
In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If 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, if any, are for descriptive purposes only and do not represent a unique embodiment.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (10)
1. A variable grip film gripping mechanism, the variable grip film gripping mechanism comprising:
the chain clamp comprises a chain clamp, wherein the chain clamp is provided with a plurality of clamping unit groups which are sequentially arranged along the longitudinal direction, each clamping unit group comprises a first clamping jaw and a second clamping jaw which are arranged along the longitudinal direction, and the longitudinal clamping length of the first clamping jaw is N 1 The longitudinal clamping length of the second clamping jaw is set to be N 2 ，N 1 >N 2 The first clamping jaw and the second clamping jaw are respectively opened and closed independently; and
The first clamping opening mechanism is arranged adjacent to the transmission chain clamp and used for driving the first clamping jaw to open.
2. The variable gripping rate film gripping mechanism of claim 1, wherein N 2 Is 0.2N 1 To 0.9N 1 。
3. The variable grip rate film gripping mechanism of claim 1, wherein the first open grip mechanism includes an open grip member attached to a support; each clamping unit group further comprises a clamping seat, the first clamping jaw and the second clamping jaw are rotatably connected to the clamping seat, and the first clamping jaw and the second clamping jaw are respectively provided with an opening position for respectively rotating to loosen the side part of the film and a clamping position for clamping the side part of the film; the first clamping jaw is provided with a driving part which is mutually in abutting fit with the clamping opening part, and the driving part can correspondingly drive the first clamping jaw to rotate to an opening position when running through the clamping opening part; the second clamping jaw is provided with an avoidance part which is mutually avoided with the opening clamping component.
4. A variable grip rate film gripping mechanism as claimed in claim 3, wherein said grip opening member is a rotatable disc rotatably connected to said support; or, the clamping opening component is a wedge-shaped abutting part arranged on the bracket, and the wedge-shaped abutting part is provided with a guide inclined plane for mutually abutting and matching with the driving part.
5. A variable grip rate film gripping mechanism as claimed in claim 3, wherein the grip blocks of each of said groups of gripping elements are provided as one, said first gripping jaw and said second gripping jaw being rotatably connected to the same grip block; or, two clamping seats of each clamping unit group are provided, and the first clamping jaw and the second clamping jaw are respectively and rotatably connected to the two clamping seats.
6. A variable grip rate film gripping mechanism as claimed in claim 3, wherein said first gripping jaw has a gripping surface formed with at least one first vent slot extending in a transverse direction; and/or at least one second ventilation groove extending along the transverse direction is formed on the supporting surface of the clamping seat.
7. The variable gripping rate film gripping mechanism of claim 6, wherein a plurality of the first ventilation grooves are provided, the plurality of the first ventilation grooves being sequentially spaced apart in the longitudinal direction; the plurality of second ventilation grooves are arranged at intervals in sequence along the longitudinal direction; each first ventilation groove corresponds to the position of each second ventilation groove.
8. A film stretching apparatus, comprising two film clamping mechanisms according to any one of claims 1 to 7, an oven, a bracket and two circular rails; the support is connected with the oven, the two annular tracks are arranged on the support, the two transmission chain clamps are arranged on the two annular tracks in a one-to-one correspondence manner, and the two first clamping opening mechanisms are connected to the support and are positioned in the oven; the oven is provided with an inlet and an outlet which are oppositely arranged, and the annular track is transmitted into the oven from the inlet and passes out of the oven from the outlet; the annular track comprises a preheating section, a stretching section, a heat setting section and a cooling section which are sequentially arranged along the longitudinal direction; the clamping opening position of the first clamping opening mechanism is positioned at the stretching section and/or the heat setting section.
9. The film stretching apparatus as recited in claim 8, wherein two of said first pinch-off mechanisms are symmetrically arranged about said longitudinal direction.
10. The film stretching device as recited in claim 8, further comprising two closing and two second opening and clamping mechanisms; the two closing clamp mechanisms are respectively arranged corresponding to the two driving chain clamps and are positioned at the inlet, and the two second opening clamp mechanisms are respectively arranged corresponding to the two driving chain clamps and are positioned at the outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310988595.5A CN116945566B (en) | 2023-08-07 | 2023-08-07 | Film clamping mechanism with variable clamping rate and film stretching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310988595.5A CN116945566B (en) | 2023-08-07 | 2023-08-07 | Film clamping mechanism with variable clamping rate and film stretching device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116945566A true CN116945566A (en) | 2023-10-27 |
| CN116945566B CN116945566B (en) | 2024-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310988595.5A Active CN116945566B (en) | 2023-08-07 | 2023-08-07 | Film clamping mechanism with variable clamping rate and film stretching device |
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| Country | Link |
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| CN (1) | CN116945566B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0122787A1 (en) * | 1983-04-16 | 1984-10-24 | Proctor and Schwartz Limited | Method and apparatus for simultaneous bi-axial stretching of film |
| FR2849801A1 (en) * | 2003-01-15 | 2004-07-16 | Darlet Marchante Tech Sa | Machine stretching plastic film longitudinally and transversely includes endless chains carrying grips which are guided by rollers on system of rails with variable separation |
| CN109318469A (en) * | 2017-08-01 | 2019-02-12 | 布鲁克纳机械有限责任两合公司 | Stretcher |
| CN111331827A (en) * | 2020-05-19 | 2020-06-26 | 佛山市盟思拉伸机械有限公司 | Film low-multiple stretching chain clamp assembly and film stretching processing device |
| CN114228122A (en) * | 2022-02-24 | 2022-03-25 | 佛山市盟思拉伸机械有限公司 | Film bidirectional mixed stretching device and method |
-
2023
- 2023-08-07 CN CN202310988595.5A patent/CN116945566B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0122787A1 (en) * | 1983-04-16 | 1984-10-24 | Proctor and Schwartz Limited | Method and apparatus for simultaneous bi-axial stretching of film |
| FR2849801A1 (en) * | 2003-01-15 | 2004-07-16 | Darlet Marchante Tech Sa | Machine stretching plastic film longitudinally and transversely includes endless chains carrying grips which are guided by rollers on system of rails with variable separation |
| CN109318469A (en) * | 2017-08-01 | 2019-02-12 | 布鲁克纳机械有限责任两合公司 | Stretcher |
| CN111331827A (en) * | 2020-05-19 | 2020-06-26 | 佛山市盟思拉伸机械有限公司 | Film low-multiple stretching chain clamp assembly and film stretching processing device |
| CN114228122A (en) * | 2022-02-24 | 2022-03-25 | 佛山市盟思拉伸机械有限公司 | Film bidirectional mixed stretching device and method |
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| Publication number | Publication date |
|---|---|
| CN116945566B (en) | 2024-11-05 |
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