Speed reduction track of synchronous two-way stretcher

Abstract

The utility model provides a speed reduction track of a synchronous two-way stretcher, which relates to the technical field of film stretching devices, and comprises a first smooth track and a second smooth track which are arranged in parallel, are both positioned at the rear end of a retraction track, and are used for a plurality of chain clip components to enter after being folded by the retraction track; the retraction track is in a curve shape. The driving chain wheel is arranged at one end of the inner side of the retraction rail and is used for driving the chain clip assembly; the width of the retraction track is 6-10 cm, and the radian bending angle alpha of the retraction track is 150-160 degrees; the maximum included angle between every two adjacent chain clip assemblies is not larger than 165-168 degrees, so that the technical problems that the cost is increased and the clip impact is serious due to the fact that a clip closing device is arranged due to the fact that a chain link is turned outwards are solved, and the technical effects of uniform deceleration and impact reduction are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to film stretching device technical field especially is related to a synchronous bidirectional stretching machine deceleration track. BACKGROUND

[0002] Bidirectional synchronous stretching machine is the equipment in the nylon film production process, is mainly used to carry out bidirectional stretching to nylon film, improves its physical performance, improves tensile strength, barrier property. In the stretching process, the extruded sheet is clamped by a clamp at the entrance of the stretching machine, the clamps on both sides run synchronously, so that the sheet is fully preheated in the preheating zone, in the stretching section, by the widening of the clamp and the regular gradually increasing movement of the spacing between the clamps, the film is stretched and oriented longitudinally and transversely at the same time. Finally, after heat treatment and cooling, the whole film production process is completed; the deceleration section in the stretching system will affect the movement state of the nipper and the quality and stability of the nylon film in the stretching process.

[0003] The existing bidirectional synchronous stretching machine deceleration section mainly includes a track, a driving sprocket, a nipper and a nipper closing device. Among them, the nipper closing device is set due to the shape of the existing track, the folding direction of the chain link is random, there is a risk of folding in the opposite direction, the nipper closing device can assist the inward folding of the chain link, prevent the chain link from turning outward, and ensure the normal operation of the equipment.

[0004] However, the nipper closing device is prone to wear and tear due to frequent friction and collision with other components during the folding process. Since the nipper closing device wears out quickly, it needs to be replaced regularly, which not only increases the production cost, but also causes the equipment to stop working, affecting the production efficiency. In addition, the existence of the nipper closing device does not fundamentally solve the problem of impact. On the track, the impact between the nippers, the nippers and the track, and the nippers and the sprocket is still serious, causing noise and reducing the service life of mechanical parts. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a synchronous bidirectional stretching machine deceleration track to alleviate the technical problems of setting a nipper closing device due to chain link turning outward, increasing cost and serious nipper impact in the prior art.

[0006] The utility model provides a synchronous bidirectional stretching machine deceleration track, which comprises a first smooth track, a second smooth track, a retracting track, a driving sprocket and a chain nipper assembly.

[0007] The first smooth track and the second smooth track are arranged in parallel, and both are located at the rear end of the retracting track, for the entry of the plurality of chain nipper assemblies after folding through the retracting track, and the retracting track is in a curved shape; the driving sprocket is arranged at one end of the inner side of the retracting track, and is used to drive the chain nipper assembly;

[0008] The width of the retraction track is 6-10 cm, and the curved angle of the retraction track is 150-160°; the maximum included angle of the two adjacent chain tongs assemblies is not greater than 165-168°.

[0009] Further, the driving sprocket comprises a slow gear and a fast gear arranged in parallel, both of which are driving gears, and the slow gear and the fast gear are provided with adjusting waist grooves.

[0010] Further, the number of teeth of the slow gear is 36, and the number of teeth of the fast gear is 24; the linear speed of the slow gear is three times that of the fast gear.

[0011] Further, the retraction track comprises a center section and two connecting sections, and the two connecting sections are located on both sides of the center section; the center section is arranged at the front end of the driving sprocket.

[0012] The connecting sections connect the first smooth track and the second smooth track.

[0013] Further, each chain tongs assembly comprises a tongs head, a tongs body and a chain link assembly.

[0014] The tongs body is slidingly installed on the first smooth track and the second smooth track, the adjacent two tongs bodies are connected through the chain link assembly, the clamping end of the tongs body is provided with the tongs head, and the tongs head is used for clamping the film.

[0015] Further, the tongs body comprises a first connecting shaft, a second connecting shaft and a rolling bearing.

[0016] The bottom end of the first connecting shaft is provided with a rolling bearing, the first connecting shaft slides on the first smooth track through the rolling bearing, and the first connecting shaft connects the tongs head.

[0017] The bottom end of the second connecting shaft is provided with a rolling bearing, and the second connecting shaft slides on the second smooth track through the rolling bearing.

[0018] The first connecting shaft and the second connecting shaft are connected through the chain link assembly to realize opening or folding.

[0019] Further, the chain link assembly comprises an H shaft, a main shaft, a joint, a first chain link and a second chain link.

[0020] The two ends of the H shaft are connected with the first connecting shaft and the second connecting shaft respectively, the main shaft connects the first connecting shaft and the second connecting shaft of the previous tongs body, the middle part of the main shaft is rotationally connected with the joint, and the joint directly and independently connects the other tongs head.

[0021] The first chain link is arranged on one side of the second connecting shaft, and the second chain link is arranged on the other side; the first chain link connects the previous second connecting shaft, and the second chain link connects the next second connecting shaft.

[0022] Further, the first smooth track, the second smooth track and the retracting track are fixedly installed on the frame of the synchronous stretching machine.

[0023] Advantages:

[0024] The utility model provides a kind of synchronous bidirectional stretching machine deceleration track, including the parallel arrangement of first smooth track and second smooth track, first smooth track and second smooth track are located the rear end of retracting track, for guiding multiple chain tongs components enter after folding through retracting track, retracting track is curve-like;Drive sprocket is arranged at one end of retracting track inner side, and drive sprocket is used to drive chain tongs component;The width of retracting track is 6cm~10cm, the radian bending angle α of retracting track is 150°~160°;The maximum included angle of adjacent two chain tongs components is not more than 165°~168°;

[0025] By setting the radian bending angle α of retracting track to 150°~160°, and control chain tongs component maximum included angle is less than 168°, make link component always keep stable tendency in folding process, eliminate the risk of link eversion, without setting closed tongs and its auxiliary structure, reach the effect of cost saving. By setting 6cm~10cm width track, smooth transition retracting track makes chain tongs component deceleration reduce impact force;And by drive sprocket profile optimization, chain tongs meshing impact noise drops 30dB.

[0026] Above all, after canceling closed tongs, not only less collision, but also avoid the maintenance demand of copper or other material closed tongs replacement every month, and the maintenance cost is reduced, and the continuous operation time of equipment is improved. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0028] Figure 1 The structure schematic view of the synchronous bidirectional stretching machine deceleration track provided by the utility model embodiment is shown in the figure.

[0029] Figure 2 The structure schematic view of the retracting track center section in the synchronous bidirectional stretching machine deceleration track provided by the utility model embodiment is shown in the figure.

[0030] Figure 3 The structure schematic view of the chain tongs component in the synchronous bidirectional stretching machine deceleration track provided by the utility model embodiment is shown in the figure.

[0031] Figure 4 A top view of the synchronous bidirectional stretching machine deceleration track middle chain tong assembly provided by the embodiment of the present application is provided.

[0032] Figure 5 A deceleration curve smoothing example diagram of the synchronous bidirectional stretching machine deceleration track provided by the embodiment of the present application is provided.

[0033] Figure 6 A progress trend diagram of the chain tong of the synchronous bidirectional stretching machine deceleration track provided by the embodiment of the present application is provided.

[0034] Icon: 1 - first smooth track; 2 - second smooth track; 3 - retraction track; 301 - center section; 302 - connecting section; 4 - drive sprocket; 401 - slow gear; 402 - fast gear; 403 - adjusting waist groove; 5 - chain tong assembly; 501 - tong head; 502 - tong body; 503 - chain link assembly; 504 - first connecting shaft; 505 - second connecting shaft; 506 - rolling bearing; 507 - H shaft; 508 - main shaft; 509 - joint; 510 - first chain link; 511 - second chain link. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0037] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0038] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, or it is the orientation or position relation that the utility model product uses usually places, only is for the convenience of describing the utility model and simplifying the description, and cannot indicate or imply that the indicated device or element must have a particular orientation, construct and operate, therefore cannot be understood as the limitation to the utility model. In addition, the term "first", "second", "third" and so on are only used for distinguishing description, and cannot be understood as indicating or implying relative importance.

[0039] In addition, the terms "horizontal", "vertical", "overhang" and so on do not mean that the component must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0040] In the description of the utility model, it also needs to explain that, unless there is definite stipulation and limitation, the term "arrangement", "installation", "connection", "connection" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected, can be mechanically connected, or electrically connected, can be directly connected, or indirectly connected through an intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0041] Some embodiments of the utility model will be described in detail below in combination with the drawings. In the case of no conflict, the following examples and the features in the examples can be combined with each other.

[0042] As shown in Figure 1 , Figure 2 The utility model embodiment provides a synchronous bidirectional stretching machine deceleration track, including: first smooth track 1, second smooth track 2, retraction track 3, drive sprocket 4 and chain tongs assembly 5.

[0043] First smooth track 1 and second smooth track 2 are parallelly arranged, and first smooth track 1 and second smooth track 2 are all located at the rear end of retraction track 3, for receiving a plurality of chain tongs assemblies entering after being folded through retraction track 3, and retraction track 3 is in curve shape; drive sprocket 4 is arranged at one end of the inner side of retraction track 3, and drive sprocket 4 is used to drive chain tongs assembly 5.

[0044] The width of retraction track 3 is 6cm~10cm, the curvature bending angle α of retraction track 3 is 150°~160°, and the maximum included angle of adjacent two chain tongs assemblies 5 is not more than 165°~168°.

[0045] Specifically, the first smooth track 1 and the second smooth track are parallel to each other, and the surface roughness Ra of the two tracks is 0.8 μm, so as to reduce the friction force when the chain gripper assembly 5 runs on the tracks. The two tracks are connected with the retraction track 3 through a smooth transition curve with a radius of 50 cm at the rear end of the retraction track 3, and the transition curve ensures that the chain gripper assembly 5 can smoothly transition when entering the first smooth track 1 and the second smooth track 2 from the retraction track 3, and impact is not generated. The retraction track 3 is curved, and the width is between 6 cm and 10 cm, and preferably is 8 cm. The material of the track is the same as that of the first smooth track and the second smooth track, and the curvature bending angle α (as shown in Figure 2

[0046] The driving sprocket 4 is arranged at one end of the inner side of the retraction track 3, the driving sprocket 4 is driven by a motor with stepless speed regulation, and is fixed on the rack of the stretching machine through a solid shaft, and a rolling bearing is arranged between the shaft and the rack to reduce the friction resistance when rotating. The driving sprocket 4 is engaged with the chain gripper assembly 5, and then a plurality of chain gripper assemblies 5 are driven to advance. The chain gripper assembly 5 is used for clamping the film and stretching the film.

[0047] The parallel arrangement of the first smooth track 1 and the second smooth track 2 and the smooth transition curve enable the chain gripper assembly 5 to stably run at a smooth speed when entering the first smooth track 1 and the second smooth track 2 from the retraction track 3, and sudden acceleration or deceleration is not generated, so as to reduce the impact between the chain gripper assembly 5 and the track. The curvature angle and the width of the retraction track 3 limit the movement track of the chain gripper assembly 5, and the impact between the chain gripper assembly 5 and the side wall of the track is avoided. By reducing the impact or collision, the noise of the equipment during operation is naturally reduced, the wear of the mechanical parts such as the track, the chain gripper assembly 5 and the driving sprocket 4 is reduced, and the service life of the equipment is prolonged.

[0048] The curvature bending angle α of the retraction track 3 is designed to be 155°, and the maximum included angle of the adjacent two chain gripper assemblies 5 is controlled to be between 165° and 168°, so that the chain gripper assembly 5 can stably fold according to the predetermined direction in the folding process, and the included angle will not exceed the safe range at all times, and the situation of chain link eversion is avoided. Therefore, it is not necessary to use a closed gripper to assist the inward folding of the chain link, the structure of the equipment is simplified, and the cost and working hours for periodically replacing the closed gripper are saved.

[0049] In the embodiment of the utility model, the driving sprocket 4 includes parallelly arranged slow gear 401 and fast gear 402, the slow gear 401 and the fast gear 402 are all driving gears, and the slow gear 401 and the fast gear 402 are provided with adjusting waist groove 403. ​

[0050] The number of teeth of the slow gear 401 is 24 teeth, and the number of teeth of the fast gear 402 is 36 teeth; the linear speed of the slow gear is three times that of the fast gear.

[0051] The retraction track 3 includes a center section 301 and two connecting sections 302, and the two connecting sections 302 are located on the left and right sides of the center section 301; the center section 301 is arranged at the front end of the driving sprocket 4; and the connecting sections 302 connect the first smooth track 1 and the second smooth track 2.

[0052] Specifically, the driving sprocket 4 includes a slow gear 401 and a fast gear 402 arranged in parallel, both of which are driving gears and do not transmit power to each other, and both of which independently provide power driving. On the slow gear 401 and the fast gear 402, an adjusting waist groove 403 is arranged, which is used to adjust the installation position of the gear or the connection state with other components, and provides flexibility for the debugging and operation of the equipment.

[0053] The number of teeth of the slow gear 401 is 36 teeth, and the number of teeth of the fast gear 402 is 24 teeth. The difference in the number of teeth and the diameter of the reference circle are matched, so that the linear speed of the slow gear 401 is three times that of the fast gear 402. During the operation of the equipment, different linear speeds will cause the chain tongs assembly 5 to fold, so as to drive the chain tongs assembly 5 to move at a reduced speed. During the movement of the chain tongs assembly 5 from the slow gear 401 to the fast gear 402, the speed will be slowed down by 3 times, and the distance between the adjacent tongs will also be reduced by 3 times, thereby realizing the folding of the tongs and preparing for the next film clamping.

[0054] The retraction track 3 includes a center section 301 and two connecting sections 302. The two connecting sections 302 are respectively located on the left and right sides of the center section 301, and the center section 301 is arranged at the front end of the driving sprocket 4, which guides the movement direction of the chain tongs assembly 5 under the action of the driving sprocket 4. The connecting sections 302 have a connecting effect, which respectively connect the first smooth track 1 and the second smooth track 2, so that the entire track forms a continuous passage, ensuring that the chain tongs assembly 5 can smoothly transition. The cooperation between the center section 301 in the retraction track 3 and the driving sprocket 4, and the connecting effect of the connecting sections 302 on different tracks, ensure the stable operation of the moving parts on the track, avoid problems such as jamming and impact, and improve the operation efficiency and stability of the entire track system.

[0055] The cooperation between the components during the operation of the device is more reasonable, and the occurrence of the collision between the chain claws, the collision between the chain claws and the track, and the collision between the chain claws and the chain wheel is reduced. The reduction of the collision not only reduces the noise, but also prolongs the service life of the mechanical components, reduces the track wear and damage of the chain claw assembly 5. At the same time, since the chain link angle during the folding of the chain claw assembly 5 is controlled according to the retraction track 3, the chain claw assembly 5 is not essentially turned over, and a closing device is not needed, thereby saving the cost and time of regularly replacing the copper or other material closing device, and reducing the maintenance cost of the device.

[0056] In the embodiment of the utility model, each chain claw assembly 5 includes a claw head 501, a claw body 502 and a chain link assembly 503;

[0057] The claw body 502 is slidingly installed on the first smooth track 1 and the second smooth track 2, and the adjacent two claw bodies 502 are connected through the chain link assembly 503. The clamping end of the claw body 502 is provided with the claw head 501, and the claw head 501 is used for clamping the film.

[0058] The claw body 502 includes a first connecting shaft 504, a second connecting shaft 505 and a rolling bearing 506. The bottom end of the first connecting shaft 504 is provided with the rolling bearing 506, the first connecting shaft 504 slides on the first smooth track 1 through the rolling bearing 506, and the first connecting shaft 504 is connected with the claw head 501.

[0059] The bottom end of the second connecting shaft 505 is provided with the rolling bearing 506, and the second connecting shaft 505 slides on the second smooth track 2 through the rolling bearing 506.

[0060] The first connecting shaft 504 and the second connecting shaft 505 are connected through the chain link assembly 503 to realize opening or folding.

[0061] The chain link assembly 503 includes an H shaft 507, a main shaft 508, a joint 509, a first chain link 510 and a second chain link 511.

[0062] The two ends of the H shaft 507 are respectively connected with the first connecting shaft 504 and the second connecting shaft 505. The main shaft 508 is connected with the first connecting shaft 504 and the second connecting shaft 505 of the previous claw body 502. The middle part of the main shaft 508 is rotationally connected with the joint 509, and the joint 509 is directly and independently connected with another claw head 501.

[0063] The first chain link 510 is arranged on one side of the second connecting shaft 505, and the second chain link 511 is arranged on the other side. The first chain link 510 is connected with the previous second connecting shaft 505, and the second chain link 511 is connected with the next second connecting shaft 505.

[0064] The first smooth track 1, the second smooth track 2 and the retraction track 3 are fixedly installed on the rack of the stretching machine.

[0065] Specifically, asFigure 3 、 Figure 4 As shown in FIGS. 1-3, each chain gripper assembly 5 comprises a gripper head 501, a gripper body 502 and a chain link assembly 503. The gripper body 502 serves as a support and a connection, and is slidingly mounted at the bottom to the first smooth rail 1 and the second smooth rail 2, so that the chain gripper assembly 5 can move smoothly on the rails. The clamping end of the gripper body 502 is provided with the gripper head 501, which is used to clamp the film and ensure that the film can be stably and synchronously stretched during production. The gripper head 501 can clamp the film, and during the movement of the chain gripper assembly 5 along the first smooth rail 1, it ensures that the film is always in a stable state and does not come off the gripper, thereby ensuring the stretching ratio precision of the film during stretching and helping to improve the quality and stability of production of the film.

[0066] The gripper body 502 comprises a first connecting shaft 504, a second connecting shaft 505 and a rolling bearing 506. The bottom end of the first connecting shaft 504 is provided with the rolling bearing 506, and through the rolling bearing 506, the first connecting shaft 504 can smoothly slide on the first smooth rail 1 and clamp the film. Similarly, the bottom end of the second connecting shaft 505 is also provided with the rolling bearing 506, which slides on the second smooth rail 2 by means of the rolling bearing 506 and is used to contact the gear of the driving sprocket 4 and then be driven. The first connecting shaft 504 and the second connecting shaft 505 are connected through the chain link assembly 503, so that the chain gripper assembly 5 can realize opening or folding actions. When the film enters the oven and is clamped, etc., the chain gripper assembly 5 changes the distance and angle between adjacent gripper bodies 502 by opening or folding.

[0067] The chain link assembly 503 comprises an H shaft 507, a main shaft 508, a joint 509, a first chain link 510 and a second chain link 511. The two ends of the H shaft 507 are respectively inserted into the first connecting shaft 504 and the second connecting shaft 505 for connection. The main shaft 508 connects the first connecting shaft 504 and the second connecting shaft 505 of the previous gripper body 502, and connects the adjacent gripper bodies 502 in series. The middle part of the main shaft 508 is rotationally connected to the joint 509, and the joint 509 is separately connected to another gripper head 501. On the second connecting shaft 505, the first chain link 510 is arranged on one side, and the second chain link 511 is arranged on the other side. The first chain link 510 is connected to the previous second connecting shaft 505, and the second chain link 511 is connected to the next second connecting shaft 505. The connection mode in the chain link assembly 503 ensures the continuity and stability of adjacent chain gripper assemblies 5, reduces the collision and friction between components, and improves the operation efficiency of the equipment.

[0068] Based on the above embodiment, the working process of the synchronous bidirectional stretching machine deceleration rail provided by the present application is as follows:

[0069] The fast gear 402 of the driving sprocket 4 drives the chain link assembly 5 to slide into the first smooth track 1 and the second smooth track 2 after being folded by the retraction track 3 at a linear speed 3 times of that of the slow gear 401. When the chain link assembly 5 enters the connecting section 302 of the retraction track 3, it is guided to turn to the front end of the driving sprocket 4 by the smooth curve. Due to the difference in linear speed, the included angle of the first chain link 510 and the second chain link 511 is reduced to ≤168°, and the distance between the adjacent claw bodies 502 is gradually shortened by 3 times, so that the folding is completed. The folded chain link assembly 5 slides to the first smooth track 1 and the second smooth track 2 again, and the claw head 501 is opened, ready to clamp the film.

[0070] It is measured that, by using the embodiment of the utility model, as shown in the figure, the deceleration curve is smoothed, the deceleration is reduced, and various impacts are reduced; as shown in the figure, the included angle of the chain link during folding is not more than 168°, and the essence is not turned over, so that the closed claw device is not needed; the cost and working hours for periodically replacing the closed claw device made of copper or other materials are saved. Figure 5 Figure 6 As shown in the figure, the deceleration curve is smoothed, the deceleration is reduced, and various impacts are reduced; as shown in the figure, the included angle of the chain link during folding is not more than 168°, and the essence is not turned over, so that the closed claw device is not needed; the cost and working hours for periodically replacing the closed claw device made of copper or other materials are saved.

[0071] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.​

Claims

1. A deceleration track for a synchronous bidirectional stretching machine, characterized in that, include: The system comprises a first smooth track (1), a second smooth track (2), a retraction track (3), a drive sprocket (4), and a chain clamp assembly (5); The first smooth track (1) and the second smooth track (2) are arranged in parallel. Both the first smooth track (1) and the second smooth track (2) are located at the rear end of the retractable track (3) for multiple chain clamp assemblies (5) to enter after being folded by the retractable track (3). The retractable track (3) is curved. The drive sprocket (4) is located at one end of the inner side of the retractable track (3). The drive sprocket (4) is used to drive the chain clamp assembly (5). The width of the retraction track (3) is 6cm to 10cm, and the arc bending angle α of the retraction track (3) is 150° to 160°; the maximum included angle between two adjacent chain clip assemblies (5) is no greater than 165° to 168°.

2. The deceleration track of the synchronous bidirectional stretching machine according to claim 1, characterized in that, The drive sprocket (4) includes a slow gear (401) and a fast gear (402) arranged in parallel. Both the slow gear (401) and the fast gear (402) are driving gears. Adjustment grooves (403) are provided on the slow gear (401) and the fast gear (402).

3. The synchronous bidirectional tensioning machine deceleration track according to claim 2, characterized in that, The slow gear (401) has 36 teeth, and the fast gear (402) has 24 teeth; the linear velocity of the slow gear (401) is three times that of the fast gear (402).

4. The synchronous bidirectional tensioning machine deceleration track according to claim 3, characterized in that, The retraction track (3) includes a central section (301) and connecting sections (302), with two connecting sections (302) located on both sides of the central section (301); the central section (301) is arranged at the front end of the drive sprocket (4); The connecting segment (302) connects the first smooth track (1) and the second smooth track (2).

5. The deceleration track of the synchronous bidirectional stretching machine according to claim 1, characterized in that, Each of the chain clamping assemblies (5) includes a clamping head (501), a clamping body (502), and a chain link assembly (503); The clamp body (502) is slidably mounted on the first smooth track (1) and the second smooth track (2). Two adjacent clamp bodies (502) are connected by the chain link assembly (503). The clamping end of the clamp body (502) is provided with the clamp head (501), which is used to clamp the film.

6. The deceleration track of the synchronous bidirectional stretching machine according to claim 5, characterized in that, The clamp body (502) includes a first connecting shaft (504), a second connecting shaft (505), and a rolling bearing (506); The bottom end of the first connecting shaft (504) is provided with the rolling bearing (506), the first connecting shaft (504) slides on the first smooth track (1) through the rolling bearing (506), and the first connecting shaft (504) is connected to the clamp head (501); The bottom end of the second connecting shaft (505) is provided with the rolling bearing (506), and the second connecting shaft (505) slides on the second smooth track (2) through the rolling bearing (506); The first connecting shaft (504) and the second connecting shaft (505) are connected by the link assembly (503) to enable opening or folding.

7. The synchronous bidirectional tensioning machine deceleration track according to claim 6, characterized in that, The link assembly (503) includes an H-axis (507), a main shaft (508), a joint (509), a first link (510), and a second link (511); The two ends of the H-axis (507) are respectively connected to the first connecting shaft (504) and the second connecting shaft (505). The main shaft (508) connects the first connecting shaft (504) and the second connecting shaft (505) of the previous clamp body (502). The middle part of the main shaft (508) is rotatably connected to the joint (509). The joint (509) is directly and independently connected to another clamp head (501). The first link (510) is provided on one side of the second connecting shaft (505), and the second link (511) is provided on the other side. The first link (510) is connected to the previous second connecting shaft (505), and the second link (511) is connected to the next second connecting shaft (505).

8. The deceleration track of the synchronous bidirectional stretching machine according to claim 1, characterized in that, The first smooth track (1), the second smooth track (2) and the retraction track (3) are all fixedly installed on the frame of the synchronous stretching machine.

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