Film stretching production line, circular track and splicing structure thereof

Abstract

The present application relates to the technical field of film stretching processing, and discloses a film stretching production line, a ring track and a splicing structure thereof, wherein the splicing structure of the ring track comprises two guide rails and a connector arranged adjacently along the length direction S of the ring track. A first buffer gap is formed on the end faces of the two guide rails facing each other along the length direction S. The connector is detachably connected between the two guide rails, the connector is fixedly connected to one of the guide rails, and a second buffer gap is formed on the end faces of the connector and the other guide rail facing each other along the length direction S. The connector is slidably arranged on the other guide rail along the length direction S, and when the connector and the two guide rails expand when heated or contract when cooled, the connector and one of the guide rails move closer to or away from the other guide rail along the length direction S, so that the first buffer gap and the second buffer gap are reduced or increased. In this way, the service life can be extended, the maintenance cost can be reduced, and the work efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of film stretching processing, and in particular to a film stretching production line, a ring track and a splicing structure thereof. Background Art

[0002] The film stretching production line in the related art includes two circular tracks that are bilaterally symmetrical, continuous, and flexible, and chain clamp mechanisms distributed along the circular tracks. In actual applications, the two sides of the film are clamped and pulled by the chain clamp mechanisms connected in series along the two circular tracks, and are stretched horizontally or longitudinally + horizontally along the running track consistent with the stretching process in the high temperature environment inside the oven. Among them, the length of the circular track usually reaches tens of meters, or even hundreds of meters, including multiple rigid supporting beams that are hingedly connected in sequence and distributed according to the track of the film stretching process, and also includes multiple guide rails that are fixedly installed on the supporting beams through fixings and spliced ​​in sequence. The track of the guide rail can be adjusted by adjusting the positioning of each hinge point of the supporting beam. The chain clamp mechanism has several moving parts, such as rollers or sliders that run close to the surface of the guide rail to achieve the track following of the guide rail. The power of the chain clamp mechanism comes from the chain disk and the motor drive system. The working surface that guides the moving part must be highly seamlessly connected at the joint, otherwise it will form a rigid mechanical impact with the high-speed moving part, resulting in abnormal mechanical wear.

[0003] The working surface of the guide rail is usually the top surface and two side surfaces, which effectively guide the chain clamp mechanism, that is, the three moving parts of the chain clamp mechanism move along the top surface and two side surfaces of the guide rail respectively. In order to prevent abnormal impact when the moving parts move at high speed, the working surface of each guide rail is required to have extremely high dimensional accuracy in the end area. For example, the geometric tolerance and dimensional tolerance of the joint surface must first meet the preliminary requirement of <0.02mm; at the same time, the length accuracy of the guide rail and the geometric accuracy of the cross-section at both ends will directly affect the quality of the splicing of each section of the guide rail. Before the equipment is put into use, each guide rail needs to be spliced ​​to obtain a circular track, and professional technicians will perform a series of processes such as fixing, local grinding, drilling positioning holes, and driving shaft pins to prevent loosening on each working surface of each connection part on site.

[0004] When the guide rail is surface hardened, such as nitriding, to meet its use environment, the relevant process will cause local damage to the wear-resistant layer. Based on the differences in application scenarios, different steel materials and manufacturing processes will be used for the guide rail and the supporting beam. After the two materials with different properties are fixed closely together, the difference in thermal expansion coefficients in a high temperature environment (usually in the range of 150℃-300℃) often causes abnormal deformation of the flexible guide rail, affecting the positioning accuracy of the preset track, thereby affecting the tensile quality of the film. The guide rail is also a wear part. Once the guide rail is replaced, the consistency between the end section of the new guide rail and the end section of the paired guide rail that has been run-in is poor. If it is polished by manual material removal, not only the downtime and maintenance costs are too high, but also the accuracy is more difficult to guarantee, and the work efficiency is low. Summary of the invention

[0005] Based on this, it is necessary to overcome the defects of the prior art and provide a film stretching production line, a ring track and a splicing structure thereof, which can extend the service life, reduce maintenance costs and improve work efficiency.

[0006] A splicing structure of an annular track, the splicing structure of the annular track comprising: two guide rails and a connector arranged adjacent to each other along the length direction S of the annular track; a first buffer gap is formed on the end faces of the two guide rails facing each other along the length direction S; the connector is detachably connected between the two guide rails, the connector is fixedly connected to one of the guide rails, a second buffer gap is formed on the end faces of the connector and the other guide rail facing each other along the length direction S, the connector is slidably arranged on the other guide rail along the length direction S, when the connector and the two guide rails expand due to heat or contract due to cold, the connector and one of the guide rails move closer to or away from the other guide rail along the length direction S, so that the first buffer gap and the second buffer gap are reduced or increased.

[0007] In one of the embodiments, first recesses are formed at the top corners at opposite ends of the two guide rails and are recessed toward the bottom of the guide rails. The connecting members are respectively installed in the two first recesses. The top surfaces of the connecting members are respectively flush with the top surfaces of the guide rails, and the two opposite side surfaces of the connecting members are respectively flush with the two opposite side surfaces of the guide rails.

[0008] In one embodiment, the first recess is step-shaped and penetrates two opposite side surfaces of the guide rail along the thickness direction of the guide rail, and the wall surface of the first recess includes at least four first step surfaces connected in sequence and arranged at an angle; the end of the connecting member is arranged in a step-shaped manner and includes at least four second step surfaces connected in sequence and arranged at an angle, and each second step surface is arranged corresponding to each first step surface; the top angle of the guide rail also forms a second recess extending downward from the middle part of the top surface of the guide rail in the thickness direction and connected to the first recess, and the connecting member is provided with a first protrusion corresponding to the second recess, or, the connecting member also forms a third recess extending downward from the middle part of the top surface of the connecting member in the vertical direction at any end along the length direction S, and the guide rail is provided with a second protrusion corresponding to the third recess.

[0009] In one embodiment, the splicing structure of the annular track also includes a fastener and a limiter; the connecting member is fixedly connected to one of the guide rails via the fastener; the connecting member is provided with a first movable hole extending along the length direction S, the limiter is connected to the other guide rail, and the limiter is passed through the first movable hole and can move relatively in the first movable hole along the length direction S.

[0010] In one embodiment, a guiding slope is formed on the top and / or side of one end of the connecting member close to the upstream side of the guide rail.

[0011] A circular track comprises a splicing structure of the circular track.

[0012] In one embodiment, the circular track also includes a plurality of supporting beams hingedly connected in sequence along the length direction S; the guide rails and the connecting members are both provided in plurality, and each connecting member is correspondingly detachably connected between any two adjacent guide rails; and each guide rail is fastened to each supporting beam at a corresponding single anchor point.

[0013] In one of the embodiments, the annular track also includes a plurality of clamping assemblies arranged on the supporting beam at intervals in sequence along the length direction S; the guide rail is arranged on the supporting beam, and the inner side of the guide rail is provided with a convex edge extending along the length direction S, and the clamping assembly is clamped on the convex edge, and the clamping assembly is also detachably connected to the guide rail, and when the guide rail expands due to heat or contracts due to cold, the structural material on the guide rail located on any side of the single anchor point can drive each of the clamping assemblies to move along the length direction S relative to the supporting beam.

[0014] In one of the embodiments, the clamping assembly includes a clamping block, a first fastening adjustment member and a second fastening adjustment member; the clamping block is provided with a second movable hole extending along the length direction S, the first fastening adjustment member is connected to the supporting beam through the second movable hole and enables the clamping block to be clamped on the supporting beam and the flange; the clamping block is also connected to the guide rail through the second fastening adjustment member.

[0015] A film stretching production line comprises the annular track.

[0016] The above-mentioned film stretching production line, annular track and splicing structure thereof, since a first buffer gap is formed on the end faces of the two guide rails facing each other along the length direction S, a second buffer gap is formed on the end faces of the connector and the other guide rail facing each other along the length direction S, and the connector is slidably arranged on the other guide rail along the length direction S, when the connector and the two guide rails expand when heated or contract when cooled, the connector and one of the guide rails adaptively move closer to or away from the other guide rail along the length direction S, which can prevent the guide rails from being deformed and damaged due to the mutual squeezing of the ends when heated, thereby eliminating the need for frequent replacement of the guide rails as in the prior art, which leads to low efficiency, high cost and low precision. On the other hand, since the connecting piece is detachably connected between the two guide rails, any worn and deformed guide rail can be flexibly disassembled and replaced; in addition, the existence of the first buffer gap and the second buffer gap allows the new guide rail to be replaced smoothly even if there are accuracy deviations and installation deviations, thereby avoiding the mutual interference defects that exist in the process of replacing the guide rails in the related art; in addition, the connecting piece plays a connecting role, which can facilitate the smooth movement of the moving part of the chain clamp mechanism from one of the guide rails to the other. Compared with the method of directly splicing two guide rails in the related art, the splicing part of the two guide rails is subjected to less impact force from the moving part, thereby reducing the impact deformation damage defects at the splicing part. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a partial structural diagram of a circular track according to an embodiment of the present application.

[0018] Figure 2 for Figure 1 A diagram showing the connection structure of two adjacent guide rails of one set of guide rails at A.

[0019] Figure 3 for Figure 2 A cross-sectional view of the BB.

[0020] Figure 4 for Figure 1 Enlarged structural diagram at C.

[0021] Figure 5 for Figure 1 Enlarged structural diagram at D.

[0022] 10. Guide rail; 11. First recess; 111. First step surface; 12. Second recess; 13. Fastener; 14. Limiting member; 15. Protruding edge; 20. Connecting member; 21. First protrusion; 211. First movable hole; 22. Guide slope; 31. First buffer gap; 32. Second buffer gap; 40. Hinge mechanism; 41. Moving part; 50. Support beam; 60. Clamping assembly; 61. Clamping block; 62. First fastening adjustment member; 63. Second fastening adjustment member. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0024] It should be noted that, in this embodiment, the length direction of the annular guide rail is as follows: Figure 1 As shown by the arrow S in , it is the same as the movement direction of the chain clip mechanism and the same as the longitudinal direction of the film. In addition, the side surface of a component refers to the surface of the component perpendicular to the movement direction S of the chain clip mechanism, that is, any side along the transverse direction of the film; the end surface of a component refers to the surface of the component along the movement direction S of the chain clip mechanism, that is, any end along the longitudinal direction of the film; the bottom surface and top surface of a component both refer to the bottom surface and top surface of a component in a normal placement state.

[0025] See also Figure 1 , Figure 2 and Figure 4 , Figure 1 A partial structural diagram of a circular track according to an embodiment of the present application is shown. Figure 2 Shows Figure 1 A diagram showing the connection structure of two adjacent guide rails 10 of one set of guide rails at position A. Figure 4 Shows Figure 1Enlarged structural diagram at C. An embodiment of the present application provides a splicing structure of a circular track, and the splicing structure of the circular track includes: two guide rails 10 and a connector 20. The two guide rails 10 are arranged adjacent to each other along the length direction S of the circular track, and a first buffer gap 31 is formed on the end faces of the two guide rails 10 that are opposite to each other along the length direction S. The connector 20 is detachably connected between the two guide rails 10, and the connector 20 is fixedly connected to one of the guide rails 10, and a second buffer gap 32 is formed on the end faces of the connector 20 and the other guide rail 10 that are opposite to each other along the length direction S. The connector 20 is slidably arranged on the other guide rail 10 along the length direction S. When the connector 20 and the two guide rails 10 expand when heated or contract when cooled, the connector 20 and one of the guide rails 10 move closer to or away from the other guide rail 10 along the length direction S, so that the first buffer gap 31 and the second buffer gap 32 are reduced or increased.

[0026] In the above-mentioned splicing structure of the annular track, a first buffer gap 31 is formed on the end faces of the two guide rails 10 that are opposite to each other along the length direction S, a second buffer gap 32 is formed on the end faces of the connector 20 and the other guide rail 10 that are opposite to each other along the length direction S, and the connector 20 is slidably arranged on the other guide rail 10 along the length direction S. When the connector 20 and the two guide rails 10 expand when heated or contract when cooled, the connector 20 and one of the guide rails 10 adaptively move closer to or farther from the other guide rail 10 along the length direction S. This can prevent the guide rails 10 from being deformed and damaged due to the mutual squeezing of the ends when heated, thereby eliminating the need for frequent replacement of the guide rails 10 as in the prior art, which leads to the defects of low efficiency, high cost and low precision; on the other hand, Since the connecting piece 20 is detachably connected between the two guide rails 10, any worn and deformed guide rail 10 can be flexibly disassembled and replaced; in addition, the existence of the first buffer gap 31 and the second buffer gap 32 allows the new guide rail 10 to be smoothly replaced even if there are precision deviations and installation deviations, thereby avoiding the mutual interference defects that exist in the process of replacing the guide rails 10 in the related art; in addition, the connecting piece 20 plays a connecting role, which can facilitate the smooth movement of the moving part 41 of the chain clamp mechanism from one of the guide rails 10 to the other guide rail 10. Compared with the method of directly splicing two guide rails 10 in the related art, the splicing portion of the two guide rails 10 is subjected to less impact force from the moving part 41, thereby reducing the impact deformation damage defects at the splicing portion.

[0027] It should be noted that the specific size of the first buffer gap 31 and the specific size of the second buffer gap 32 can be the same or different, and can be flexibly adjusted and set according to actual needs, as long as it is larger than the thermal expansion value of the two guide rails 10 and the connector 20 along the length direction S at a preset high temperature, thereby avoiding mutual squeezing and deformation between the end faces of the two guide rails 10 and between the connector 20 and the end face of another guide rail 10 after thermal expansion.

[0028] In one embodiment, first recesses 11 are formed at the top corners of the two opposite ends of the two guide rails 10, which are recessed toward the bottom of the guide rails 10. The connectors 20 are respectively installed in the two first recesses 11, and the top surfaces of the connectors 20 are respectively flush with the top surfaces of the guide rails 10, and the two opposite side surfaces of the connectors 20 are respectively flush with the two opposite side surfaces of the guide rails 10. In this way, during use, the top moving part 41 of the chain clamp mechanism can be smoothly moved from the top surface of one of the guide rails 10 to the top surface of the other guide rail 10 through the top surface of the connector 20, and the side moving part 41 of the chain clamp mechanism can be smoothly moved from the side surface of one of the guide rails 10 to the side surface of the other guide rail 10 through the side surface of the connector 20. The connector 20 and the opposite ends of the two guide rails 10 are less impacted by the moving part 41, and are not prone to deformation and damage defects, which can extend the service life of the splicing structure.

[0029] It should be noted that the top surface of the connector 20 is flush with the top surface of the guide rail 10, which means that the top surface of the connector 20 and the top surface of the guide rail 10 are in the same plane. Of course, a deviation of ±5mm between the two surfaces due to processing errors and / or assembly errors is allowed. When the two are in the same plane, it can ensure that the moving part 41 of the chain clamp mechanism transitions smoothly and at high speed at the junction of two adjacent guide rails 10. Similarly, the side surface of the connector 20 is flush with the side surface of the guide rail 10, which means that the side surface of the connector 20 and the side surface of the guide rail 10 are in the same plane. Of course, a deviation of ±5mm between the two surfaces due to processing errors and / or assembly errors is allowed. When the two are in the same plane, it can ensure that the moving part 41 of the chain clamp mechanism transitions smoothly and at high speed at the junction of two adjacent guide rails 10.

[0030] The applicant has discovered through research that the gap between the side of the guide rail 10 and the side of the connector 20 is a discontinuous surface and is more susceptible to deformation and damage defects under the pressure and impact of the moving part 41 of the chain clamp mechanism. Once deformation and damage defects occur, the operating stability of the chain clamp mechanism is reduced, and defects such as abnormal noise occur, resulting in a low service life and requiring timely replacement and maintenance.

[0031] In some embodiments, the top surface of the connector 20 and the top surface of any one of the guide rails 10 are matched in their relative contours and are arranged in a curved shape, that is, they are concave-convex matching forms. The specific shapes include, but are not limited to, regular shapes such as sawtooth shapes, S shapes, W shapes, and other irregular shapes, which can be flexibly adjusted and arranged according to actual needs and are not limited here. In this way, when the moving part 41 of the chain clamp mechanism moves between the top surface of the guide rail 10 and the top surface of the connector 20, the moving part 41, such as a roller, moves to the gap between the top surface of the guide rail 10 and the top surface of the connector 20, and at least simultaneously presses against the top surface of the guide rail 10 or the top surface of the connector 20. Compared with setting the relative contours of the top surface of the connector 20 and the top surface of any one of the guide rails 10 to be straight lines, the impact on the gap between the top surface of the connector 20 and the top surface of any one of the guide rails 10 can be greatly reduced, and deformation and damage defects are not likely to occur, which can extend the service life of the splicing structure.

[0032] In some embodiments, similar to the setting form of the top surface, the contour shape of the side of the connector 20 and the side of any one of the guide rails 10 that are opposite to each other are matched and set to be curved, that is, they present a concave-convex matching form. The specific shape includes but is not limited to regular shapes such as sawtooth shape, S shape, W shape and other irregular shapes, which can be flexibly adjusted and set according to actual needs and are not limited here. In this way, when the moving part 41 of the chain clamp mechanism moves between the side of the guide rail 10 and the side of the connector 20, while moving to the gap between the side of the guide rail 10 and the side of the connector 20 that it contacts, it also at least simultaneously presses against the side of the guide rail 10 or the side of the connector 20. Compared with setting the contour shape of the side of the connector 20 and the side of any one of the guide rails 10 that are opposite to each other to be straight, the impact on the gap between the side of the connector 20 and the side of any one of the guide rails 10 can be greatly reduced, and deformation and damage defects are not likely to occur, which can extend the service life of the splicing structure.

[0033] In a specific embodiment, the moving part 41 of the chain clamp mechanism is a roller, and a certain transition overlap is formed in the direction of the roller running track. The roller at this position can contact the connecting piece 20 and one of the guide rails 10. In the process of moving from the upstream guide rail 10 to the downstream guide rail 10, it is guided by the working surfaces of the guide rail 10 and the connecting piece 20 in the following order: upstream guide rail 10-upstream guide rail 10+connecting piece 20-connecting piece 20-downstream guide rail 10+connecting piece 20-downstream guide rail 10. It can be seen that the displacement of the roller from the upstream guide rail 10 to the downstream guide rail 10 is respectively assisted by the handover transition of the working surface of the connecting piece 20, thereby not only solving the various problems caused by the thermal expansion of the length of the guide rail 10, but also avoiding the overall frontal impact at the joint of the guide rail 10 when the roller moves at high speed.

[0034] It should be noted that the upstream and downstream in this embodiment are based on the movement direction S of the chain clamp mechanism, and the chain clamp mechanism moves along the movement direction S from upstream to downstream.

[0035] See also Figure 3 In some embodiments, the connector 20 is fixedly connected to one of the guide rails 10, including but not limited to being detachably fixedly connected together by various fasteners 13 such as pins, rivets, screws, bolts, and clips. In this way, the connector 20 and one of the guide rails 10 expand together when heated and move toward the direction close to the other guide rail 10, and contract together and move away from the other guide rail 10 when cooled. Furthermore, the two end faces of the connector 20 and one of the guide rails 10 facing each other along the length direction S can be reserved with a buffer gap, in which case the gap size of the two end faces facing each other is greater than 0; or they can be tightly abutted together, which can make the connection between the connector 20 and one of the guide rails 10 more stable, in which case the gap size of the two end faces facing each other is 0.

[0036] Of course, as some optional schemes, the top surface of the connector 20 and the top surface of any one of the guide rails 10 can also be arranged in a straight line. In addition, the side surface of the connector 20 and the side surface of any one of the guide rails 10 can also be arranged in a straight line.

[0037] See also Figure 1 , Figure 2 and Figure 4In one embodiment, the first recess 11 is stepped and penetrates two opposite sides of the guide rail 10 along the thickness direction of the guide rail 10. The wall surface of the first recess 11 includes at least four first step surfaces 111 connected in sequence and arranged at an angle. The end of the connector 20 is stepped and includes at least four second step surfaces connected in sequence and arranged at an angle. Each second step surface is arranged corresponding to each first step surface 111. In addition, the top corner of each guide rail 10 also forms a second recess 12 extending downward from the middle part of the top surface of the guide rail 10 in the thickness direction and connected to the first recess 11. The connector 20 is provided with a first protrusion 21 correspondingly extending into the second recess 12. Alternatively, the connector 20 is also provided with a third recess extending downward from the middle part of the top surface of the connector 20 in the vertical direction at any end of the length direction S. The guide rail is provided with a second protrusion correspondingly extending into the third recess.

[0038] Specifically, the guide rail 10 fixedly connected to the connecting member 20 is set as the first guide rail. Figures 2 to 4 the other guide rail 10, that is, the guide rail 10 that slides with the engaging member 20, is set as the second guide rail, that is, as shown Figures 2 to 4 The left side rail 10 is shown in FIG. Figure 4 , the end faces of the first guide rail and the connector 20 facing each other are, for example, tightly abutted and connected and fixed together by fasteners 13, so that when they expand due to heat or contract due to cold, they will move relative to the second guide rail together with the connector 20. In addition, a second buffer gap 32 is left between the end faces of the second guide rail and the connector 20 facing each other, so that the connector 20 and the first guide rail can slide relative to each other on the second guide rail along the length direction S. Optionally, the first projection 21 of the connector 20 used to be inserted into the second recess 12 of the second guide rail is formed with a first movable hole 211 extending along the length direction S, and the first movable hole 211 is specifically, for example, a waist-shaped hole, and a limiter 14 is installed on the end of the second guide rail, and the limiter 14 includes but is not limited to a limiter pin or a movable rod, etc., which is inserted into the first movable hole 211, and the connector 20 can move relative to the limiter 14 along the length direction S through the first movable hole 211. In this way, on the one hand, when the connector 20 expands due to heat or contracts due to cold, the limit member 14 plays a guiding role, so that the connector 20 moves within a certain range along the length direction S relative to the limit member 14, and at the same time, the first protrusion 21 of the connector 20 is limited by the second recess 12 along the lateral direction, which can improve the movement stability of the guide rail 10 when it expands due to heat or contracts due to cold; on the other hand, the limit member 14 plays a connecting role, connecting the connector 20 and the second guide rail together to prevent the connector 20 from detaching from the second guide rail.

[0039] In some embodiments, the first guide rail is specifically set as the upstream guide rail 10, and the second guide rail is correspondingly set as the downstream guide rail 10. Conversely, the first guide rail can also be set as the downstream guide rail 10, and the second guide rail is correspondingly set as the upstream guide rail 10.

[0040] In a specific embodiment, the splicing structure of the annular track further includes a fastener 13 and a stopper 14. The connecting member 20 is fixedly connected to one of the guide rails 10 through the fastener 13. The connecting member 20 is provided with a first movable hole 211 extending along the length direction S, and the stopper 14 is connected to the other guide rail 10. The stopper 14 is inserted into the first movable hole 211 and can move relatively in the first movable hole 211 along the length direction S.

[0041] It should be noted that the length of the first movable hole 211 along the length direction S can be flexibly adjusted and set according to actual needs. Specifically, it can be set to accommodate the maximum displacement of the limit member 14 when the guide rail 10 and the connecting member 20 expand due to heat or contract due to cold, so as to ensure a high-speed and smooth transition of the moving part 41 of the chain clamp mechanism at the junction of two adjacent guide rails 10.

[0042] In some embodiments, the fastener 13 and the limit member 14 are preferably spring pins. The spring pins have a self-locking function to prevent axial loosening. When the guide rail 10 or the connector 20 needs to be disassembled for maintenance, the spring pins can also be quickly removed, which is simple and quick.

[0043] In one embodiment, a guide slope 22 is formed on the top and / or side of one end of the connector 20 close to the upstream guide rail 10. Specifically, the guide slope 22 is inclined in a vertical direction along the displacement direction of the moving part 41 of the chain clamp mechanism. In this way, the guide slope 22 is located at the junction of the connector 20 and the upstream guide rail 10. In the process of the moving part 41 of the chain clamp mechanism moving from the upstream guide rail 10 to the connector 20, it plays a good guiding role for the moving part 41 of the chain clamp mechanism, thereby achieving a high-speed and smooth transition of the roller at the junction of the guide rail 10. In addition, it can be known from a large amount of test data that even if there is a difference in the accuracy of the plane dimensions at the junction of the guide rail 10 and the connector 20, the guide slope 22 will also play a role in preventing the roller from being subjected to rigid impact. The cross section of the guide rail 10 junction does not need to be manufactured with the highest precision as the manufacturing target, and a high-speed and smooth transition of the roller at the guide rail 10 junction can be achieved without a large number of professionals performing on-site corrections during on-site assembly and future replacement.

[0044] See also Figure 1 , Figure 2 and Figure 4 In one embodiment, a circular track includes a splicing structure of the circular track of any of the above embodiments.

[0045] In the above-mentioned annular track, a first buffer gap 31 is formed on the end faces of the two guide rails 10 that are opposite to each other along the length direction S, a second buffer gap 32 is formed on the end faces of the connector 20 and the other guide rail 10 that are opposite to each other along the length direction S, and the connector 20 is slidably arranged on the other guide rail 10 along the length direction S. When the connector 20 and the two guide rails 10 expand when heated or contract when cooled, the connector 20 and one of the guide rails 10 adaptively move closer to or farther away from the other guide rail 10 along the length direction S. This can prevent the guide rails 10 from being deformed and damaged due to the mutual squeezing of the ends when heated, thereby eliminating the need to frequently replace the guide rails 10 as in the prior art, which leads to the defects of low efficiency, high cost and low precision; on the other hand, due to The connecting piece 20 is detachably connected between the two guide rails 10, so that any worn and deformed guide rail 10 can be flexibly disassembled and replaced; in addition, the existence of the first buffer gap 31 and the second buffer gap 32 allows the new guide rail 10 to be smoothly replaced even if there are accuracy deviations and installation deviations, and can avoid the mutual interference defects that exist in the process of replacing the guide rails 10 in the related art; in addition, the connecting piece 20 plays a connecting role, which can facilitate the smooth movement of the moving part 41 of the chain clamp mechanism from one of the guide rails 10 to the other guide rail 10. Compared with the method of directly splicing two guide rails 10 in the related art, the splicing portion of the two guide rails 10 is subjected to less impact force from the moving part 41, which can reduce the impact deformation damage defects at the splicing portion.

[0046] See also Figure 1 , Figure 4 and Figure 5 In some embodiments, the annular track further includes a plurality of supporting beams 50 hingedly connected in sequence along the length direction S. The annular track includes two groups of guide rails 10, one group of which is set as an inner ring, and the other group is set as an outer ring, and the outer ring is arranged circumferentially around the inner ring. Specifically, the inner ring or the outer ring is taken as an example for introduction, and each group of guide rails 10 includes a plurality of guide rails 10. In addition, a plurality of connectors 20 are provided, and each connector 20 is correspondingly detachably connected between any two adjacent guide rails 10. In addition, the middle part of each guide rail 10 is fastened to each supporting beam 50 corresponding to a single anchor point. In actual applications, most of the guide rails 10 are close to the supporting beam 50 to meet the trajectory distribution of the film stretching process. Due to the single-point anchoring of the guide rail 10 and the supporting beam 50, the relative positions of the two remain unchanged under track adjustment and high-temperature thermal expansion conditions. When the two need to achieve different expansion and contraction changes in the length direction S due to thermal expansion, etc., the displacement of the two in the length direction S can avoid abnormal deformation, and the middle anchor point can reasonably balance the maximum displacement of the two ends of the guide rail 10, ultimately ensuring the positioning trajectory accuracy of the guide rail 10.

[0047] In one embodiment, the annular track further includes a plurality of clamping assemblies 60 arranged on the supporting beam 50 in sequence and at intervals along the length direction S. The guide rail 10 is arranged on the supporting beam 50, and the inner side of the guide rail 10 is provided with a flange 15 extending along the length direction S. The clamping assemblies 60 are clamped on the flange 15, and the clamping assemblies 60 are also detachably connected to the guide rail 10. When the guide rail 10 expands when heated or contracts when cooled, the structural materials on either side of the single anchor point on the guide rail 10 can drive each clamping assemblies 60 to move relative to the supporting beam 50 along the length direction S. In this way, under the vertical clamping force of each clamping component 60, the guide rail 10 can be tightly pressed against the bottom surface of the supporting beam 50. At the same time, since each clamping part is connected to the guide rail 10, a lateral force is applied to the guide rail 10, so that the guide rail 10 and the side reference surface of the supporting beam 50 can be tightly pressed against each other, and the stability is better. At the same time, the material of the guide rail 10 is different from that of the supporting beam 50. The supporting beam 50 is made of rigid material, and the guide rail 10 is made of flexible material. The degree of thermal expansion and deformation of the supporting beam 50 is smaller than that of the guide rail 10. By adjusting the clamping force of the clamping component 60, the relative displacement between the two reference surfaces of the guide rail 10 and the supporting beam 50 caused by the difference in thermal expansion is allowed.

[0048] Specifically, the clamping assembly 60 includes a clamping block 61, a first tightening adjustment member 62, and a second tightening adjustment member 63. The clamping block 61 is provided with a second movable hole extending along the length direction S, such as a waist-shaped hole or a strip-shaped hole. The first tightening adjustment member 62 passes through the second movable hole and is connected to the supporting beam 50 so that the clamping block 61 is pressed against the supporting beam 50 and the flange 15. Since the tightness of the first tightening adjustment member 62 is adjustable, the clamping force of the clamping block 61 on the supporting beam 50 and the flange 15 can be adjusted. Meanwhile, the clamping block 61 is also connected to the guide rail 10 through the second tightening adjustment member 63, so that the guide rail 10 and the side reference surface of the supporting beam 50 can be closely abutted. Since the tightness of the second tightening adjustment member 63 is adjustable, the clamping force between the guide rail 10 and the side reference surface of the supporting beam 50 can be adjusted.

[0049] In some embodiments, the first fastening adjustment member 62 and the second fastening adjustment member 63 are independently configured, including but not limited to bolts, screws, etc.

[0050] Specifically, the first tightening adjustment member 62 includes but is not limited to a vertically acting bolt, and the second tightening adjustment member 63 includes but is not limited to a transversely acting bolt. The guide rail 10 is limited on the contact surface of the supporting beam 50 in the up-down and left-right directions by means of the vertically acting bolt and the transversely acting bolt. Except for the anchor point position, the contact surface of the guide rail 10 and the supporting beam 50 is allowed to be relatively displaced in the length direction S, that is, the guide rail 10 is acted on the supporting beam 50 in two directions by the clamping assembly 60, but it is only limited and not tightly pressed. In order to achieve that in the alternating environment of thermal expansion / normal temperature, a single relatively flexible guide rail 10 is allowed to be positioned on a rigid supporting beam 50 made of materials with different thermal expansion coefficients by anchor points, and local deformation can be avoided by relative displacement of the contact surface with the supporting beam 50 in the length direction.

[0051] It should be noted that, except for the clamping block 61 at the anchor point, the other clamping blocks 61 are all provided with a second movable hole to allow relative displacement between them and the vertically acting bolts in the length direction S.

[0052] When the guide rail 10 moves relative to the supporting beam in the length direction, it will synchronously drive the transverse action bolt and the clamping block 61 to move. The vertical action bolt passes through the second movable hole and is screwed and fixed on the screw hole of the supporting beam 50 to limit the clamping block 61 in the vertical direction.

[0053] In one embodiment, a film stretching production line includes the annular track of any one of the above embodiments.

[0054] In the above-mentioned film stretching production line, a first buffer gap 31 is formed on the end faces of the two guide rails 10 that are opposite to each other along the length direction S, a second buffer gap 32 is formed on the end faces of the connector 20 and the other guide rail 10 that are opposite to each other along the length direction S, and the connector 20 is slidably arranged on the other guide rail 10 along the length direction S. When the connector 20 and the two guide rails 10 expand when heated or contract when cooled, the connector 20 and one of the guide rails 10 adaptively move closer to or farther from the other guide rail 10 along the length direction S. This can prevent the guide rails 10 from being deformed and damaged due to the mutual squeezing of the ends when heated, thereby eliminating the need to frequently replace the guide rails 10 as in the prior art, which leads to the defects of low efficiency, high cost and low precision. On the other hand, The connecting piece 20 is detachably connected between the two guide rails 10, so that any worn and deformed guide rail 10 can be flexibly disassembled and replaced; in addition, the existence of the first buffer gap 31 and the second buffer gap 32 allows the new guide rail 10 to be smoothly replaced even if there are accuracy deviations and installation deviations, and can avoid the mutual interference defects that exist in the process of replacing the guide rails 10 in the related art; in addition, the connecting piece 20 plays a connecting role, which can facilitate the smooth movement of the moving part 41 of the chain clamp mechanism from one of the guide rails 10 to the other guide rail 10. Compared with the method of directly splicing two guide rails 10 in the related art, the splicing portion of the two guide rails 10 is subjected to less impact force from the moving part 41, which can reduce the impact deformation damage defects at the splicing portion.

[0055] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0056] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0057] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0058] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0059] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0060] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A splicing structure of a ring track, applied to a film stretching production line, the film stretching production line includes a chain clamp mechanism, characterized in that: The splicing structure of the annular track includes: Two guide rails are arranged adjacent to each other along the length direction S of the annular track, and a first buffer gap is formed on the end surfaces of the two guide rails facing each other along the length direction S; and A connecting piece, the connecting piece is detachably connected between the two guide rails, the connecting piece is fixedly connected to one of the guide rails, a second buffer gap is formed on the end faces of the connecting piece and the other guide rail that are opposite to each other along the length direction S, the connecting piece is slidably arranged on the other guide rail along the length direction S, when the connecting piece and the two guide rails expand when heated or contract when cooled, the connecting piece and one of the guide rails move closer to or away from the other guide rail along the length direction S, so that the first buffer gap and the second buffer gap are reduced or increased; Among them, first recesses are formed at the top corners at the two opposite ends of the two guide rails, and the connecting parts are respectively installed in the two first recesses. The top surfaces of the connecting parts are flush with the top surfaces of the guide rails, and the two opposite side surfaces of the connecting parts are respectively flush with the two opposite side surfaces of the guide rails. During use, the top moving part of the chain clamp mechanism can move from the top surface of one of the guide rails to the top surface of the other guide rail through the top surface of the connecting part, and the side moving part of the chain clamp mechanism can move from the side surface of one of the guide rails to the side surface of the other guide rail through the side surface of the connecting part.

2. The splicing structure of the circular track according to claim 1, characterized in that: The top surface of the connector matches the top surface of any one of the guide rails in a relative position and is arranged in a curved shape; or, the side surface of the connector matches the side surface of any one of the guide rails in a relative position and is arranged in a curved shape.

3. The splicing structure of the circular track according to claim 1, characterized in that: The first recess is step-shaped and passes through two opposite side surfaces of the guide rail along the thickness direction of the guide rail, and the wall surface of the first recess includes at least four first step surfaces connected in sequence and arranged at an angle; the end of the connector is arranged in a step-shaped manner and includes at least four second step surfaces connected in sequence and arranged at an angle, and each second step surface is arranged corresponding to each first step surface; the top angle of the guide rail also forms a second recess extending downward from the middle part of the top surface of the guide rail in the thickness direction and connected to the first recess, and the connector is provided with a first protrusion corresponding to the second recess, or, the connector is further formed at any end along the length direction S with a third recess extending downward from the middle part of the top surface of the connector in the vertical direction, and the guide rail is provided with a second protrusion corresponding to the third recess.

4. The splicing structure of the circular track according to claim 1 or 2, characterized in that: The splicing structure of the annular track also includes a fastener and a limiter; the connecting member is fixedly connected to one of the guide rails through the fastener; the connecting member is provided with a first movable hole extending along the length direction S, the limiter is connected to the other guide rail, and the limiter is passed through the first movable hole and can move relatively in the first movable hole along the length direction S.

5. The splicing structure of the circular track according to any one of claims 1 to 3, characterized in that: A guiding slope is formed on the top and / or side of one end of the connecting piece close to the guide rail at the upstream.

6. A circular track, characterized in that: The circular track comprises a splicing structure of the circular track according to any one of claims 1 to 5.

7. The circular track according to claim 6, characterized in that: The annular track also includes a plurality of supporting beams hingedly connected in sequence along the length direction S; the guide rails and the connecting members are both provided in plurality, and each connecting member is correspondingly detachably connected between any two adjacent guide rails; and each guide rail is fastened to each supporting beam at a corresponding single anchor point.

8. The circular track according to claim 7, characterized in that: The annular track also includes a plurality of clamping assemblies arranged on the supporting beam at intervals in sequence along the length direction S; the guide rail is arranged on the supporting beam, and the inner side of the guide rail is provided with a convex edge extending along the length direction S, and the clamping assembly is clamped on the convex edge. The clamping assembly is also detachably connected to the guide rail, and when the guide rail expands due to heat or contracts due to cold, the structural material on the guide rail located on any side of the single anchor point can drive each of the clamping assemblies to move along the length direction S relative to the supporting beam.

9. The circular track according to claim 8, characterized in that: The clamping assembly includes a clamping block, a first tightening adjustment member and a second tightening adjustment member; the clamping block is provided with a second movable hole extending along the length direction S, the first tightening adjustment member is connected to the supporting beam through the second movable hole and enables the clamping block to be tightened on the supporting beam and the flange; the clamping block is also connected to the guide rail through the second tightening adjustment member.

10. A film stretching production line, characterized in that: The film stretching production line comprises the circular track according to any one of claims 7 to 9.

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