Film stretcher with chain wheel tensioning mechanism

Abstract

The utility model provides a thin film stretcher with a chain wheel tensioning mechanism. The thin film stretcher solves the technical problem that a chain of an existing thin film stretcher is prone to expansion after being heated and cannot be straightened. The stretching machine comprises a stretching machine body, a chain driving assembly, a chain driven assembly and a chain, the chain driven assembly comprises a movable box body, a driven chain wheel, a tension driving motor and a tensioning driving mechanism, a movable top cover capable of sliding in the transmission direction is arranged at the top of the movable box body, the driven chain wheel and the tension driving motor are distributed on the upper side and the lower side of the movable top cover, and the driven chain wheel is connected with the tension driving motor through a chain wheel shaft; the tensioning driving mechanism is installed on the side wall of the movable box body, and a driving shaft is connected with the movable top cover. The utility model is widely applied to the technical field of film stretching machines.

Description

TECHNICAL FIELD

[0001] The application relates to a film stretching machine, in particular to a film stretching machine with a chain wheel tensioning mechanism. BACKGROUND

[0002] The processing of polyimide film requires stretching under high temperature conditions using a stretching machine. The stretching machine usually adopts a chain gear transmission form. For example, a polyimide film bidirectional stretching machine is disclosed in Chinese Utility Model Patent No. CN211441156U, which comprises a chain drive gear, a driving motor, a combined needle belt, a heating furnace, a track, a stretching rod, a stretching motor, and a heating pipe. The heating pipe and the track are arranged inside the heating furnace. The stretching machine chain is installed on the track. The driving motor is located outside the heating furnace. The combined needle belt is engaged with the chain drive gear. The driving motor is arranged outside the heating furnace, so that the combined needle belt runs to the outside of the heating furnace for cooling, thereby avoiding the problem that the bearing cannot operate in a high temperature environment for a long time.

[0003] However, the chain inevitably passes through the inside of the heating furnace. Due to the excessive length of the stretching machine, the chain expands when passing through the stretching heating. The stretching machine is heated to a maximum temperature of 400-600 DEG C. Taking a 25-meter stretching machine as an example, the chain is expected to expand by 80 mm. Due to the long distance between the driving end and the driven end of the chain, the chain may not be straightened. SUMMARY

[0004] To solve the problem that the chain of the existing film stretching machine expands and cannot be straightened when heated, the technical scheme adopted by the application is to provide a film stretching machine with a chain wheel tensioning mechanism, which comprises a stretching machine body, a chain drive assembly, a chain driven assembly, and a chain. The chain driven assembly comprises a movable box body, a driven chain wheel, a tension driving motor, and a tension driving mechanism. The movable box body is provided with a movable top cover capable of sliding along the transmission direction. The driven chain wheel and the tension driving motor are distributed on the upper and lower sides of the movable top cover, and the driven chain wheel is connected with the tension driving motor through a chain wheel shaft. The tension driving mechanism is installed on the side wall of the movable box body, and the driving shaft is connected with the movable top cover.

[0005] Preferably, the chain wheel shaft is sleeved with a bearing, the bearing is sleeved with a bearing sleeve, the bearing sleeve is externally provided with a positioning boss, and the positioning boss is connected with the movable top cover.

[0006] Preferably, the chain wheel shaft is connected with the output shaft of the tension driving motor through a shaft coupling; an upper pressing plate is connected above the bearing sleeve; a lower pressing plate is connected below the bearing sleeve; and a connecting sleeve is connected below the lower pressing plate.

[0007] Preferably, the bottom plate of the movable box body is provided with a movable opening allowing the driven chain wheel to move; the top of the side plate of the movable box body is slidingly connected with the movable top cover; and the movable top cover is provided with a connecting vertical plate at one end close to the tension driving mechanism.

[0008] Preferably, the two opposite side plate top of the movable box is connected with the movable top cover through linear guide rail.

[0009] Preferably, the tensioning driving mechanism is a cylinder, and the piston rod of the cylinder is connected with the connecting longitudinal plate through a movable joint.

[0010] Preferably, oil seal is arranged between the upper pressing plate, the lower pressing plate and the sprocket shaft.

[0011] Preferably, the movable box further comprises a fixed top cover, which is arranged close to the side of the tensioning driving mechanism.

[0012] The beneficial effects of the utility model are that the tensioning driving mechanism and the tension driving motor are additionally arranged, the tensioning driving mechanism drives the driven sprocket to slide back and forth along the transmission direction through the movable top cover, the expansion / contraction caused by the high-temperature heating or the cooling of the chain in the body of the stretching machine is absorbed, and the situation that the chain cannot be stretched straight due to the expansion of the chain and is folded is avoided. The tension driving motor can provide power for the driven sprocket, cooperates with the driving motor of the chain driving assembly, forms a combination of pushing and pulling, that is, the chain driving assembly pushes the chain, and the chain driven assembly pulls the chain, so that the stress on the overlong chain is optimized, and the chain runs more stably at the end of the driven sprocket. Moreover, the output power of the driving motor of the chain driving assembly can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0014] Figure 1 The structure schematic diagram of the film stretching machine provided by an embodiment of the present application is shown in the figure.

[0015] Figure 2 The enlarged schematic diagram of A in the figure is shown in the figure. Figure 1

[0016] Figure 3 The connection schematic diagram of the driven sprocket, the movable box and the tensioning driving mechanism is shown in the figure.

[0017] Figure 4 The connection schematic diagram of the driven sprocket, the movable box and the tensioning driving mechanism is shown in the figure.

[0018] Explanation of symbols in the figure:

[0019] ​1. Stretching machine body; 2. Chain drive assembly; 3. Chain driven assembly; 4. Chain; 5. Film; 6. Driven sprocket; 7. Tension drive motor; 8. Tension drive mechanism; 9. Movable top cover; 10. Sprocket shaft; 11. Bearing; 12. Bearing sleeve; 13. Positioning boss; 14. Coupling; 15. Upper pressing plate; 16. Lower pressing plate; 17. Connecting sleeve; 18. Connecting longitudinal plate; 19. Linear guide rail; 20. Fixed top cover; 21. Air cylinder; 22. Piston rod; 23. Movable joint; 24. Movable box. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only intended to explain the present application and not to limit the present application.

[0021] The film stretching machine with sprocket tensioning mechanism provided by the present application will now be described.

[0022] Please refer to Figure 1 , the film stretching machine with sprocket tensioning mechanism includes a stretching machine body 1, a chain drive assembly 2, a chain driven assembly 3 and a chain 4. Specifically, the chain 4 is provided with a needle plate, and a film 5 is fixed thereon, enters from one end of the chain driven assembly 3, is heated by the stretching machine body 1, and is finally output from one end of the chain drive assembly 2.

[0023] Please refer to Figures 1 to 4 , the chain driven assembly 3 includes a movable box 24, a driven sprocket 6, a tension drive motor 7 and a tension drive mechanism 8. The movable box 24 is provided with a movable top cover 9 at the top, which can slide along the transmission direction. The driven sprocket 6 and the tension drive motor 7 are distributed on the upper and lower sides of the movable top cover 9, and the driven sprocket 6 is connected with the tension drive motor 7 through a sprocket shaft 10, which is rotatably connected with the movable top cover 9. The tension drive mechanism 8 is installed on the side wall of the movable box 24, and the driving shaft is connected with the movable top cover 9.

[0024] The tension drive mechanism 8 drives the driven sprocket 6 to slide back and forth along the transmission direction through the movable top cover 9, absorbs the expansion / contraction of the chain 4 caused by high temperature heating or shutdown cooling inside the stretching machine body 1, and avoids the situation that the chain 4 cannot be stretched straight due to expansion, causing the chain 4 to fold. The tension drive motor 7 can provide power to the driven sprocket 6, cooperate with the drive motor of the chain drive assembly 2, form a combination of pushing and pulling, i.e. the chain drive assembly 2 pushes the chain 4, and the chain driven assembly 3 pulls the chain 4, thereby optimizing the stress on the overlong chain 4, making the chain 4 run more stably at the end of the driven sprocket 6. Moreover, the output power of the drive motor of the chain drive assembly 2 can be reduced.

[0025] Further, in order to ensure the smooth operation of the tension drive motor 7 and the driven sprocket 6. The sprocket shaft 10 is provided with a bearing 11, the bearing 11 is provided with a bearing sleeve 12, the bearing sleeve 12 is provided with a positioning boss 13, the positioning boss 13 is connected with the movable top cover 9. Specifically, the sprocket shaft 10 is connected with the output shaft of the tension drive motor 7 through a shaft coupling 14, the bearing sleeve 12 is connected with an upper pressing plate 15 above, the bearing sleeve 12 is connected with a lower pressing plate 16 below, and the lower pressing plate 16 is connected with a connecting sleeve 17 below.

[0026] In one embodiment, the bottom plate of the movable box 24 is provided with a movable opening allowing the movement of the driven sprocket 6, the top of the side plate of the movable box 24 is connected with the movable top cover 9 in a sliding manner, and the movable top cover 9 is provided with a connecting vertical plate 18 near one end of the tension drive mechanism 8. Further, the top of the two opposite side plates of the movable box 24 is connected with the movable top cover 9 through a linear guide rail 19. The movable box 24 further comprises a fixed top cover 20 provided near the side of the tension drive mechanism 8 for dust prevention.

[0027] In one embodiment, the tension drive mechanism 8 is a pneumatic cylinder 21, the piston rod 22 of the pneumatic cylinder 21 is connected with the connecting vertical plate 18 through a movable joint 23. The pneumatic cylinder 21 drives the connecting vertical plate 18 through the movable joint 23, and then drives the driven sprocket 6.

[0028] In one embodiment, the upper pressing plate 15, the lower pressing plate 16 and the sprocket shaft 10 are all provided with oil seals to prevent oil leakage.

[0029] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application 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 of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A film stretching machine with a sprocket tensioning mechanism, comprising: The stretching machine body, the chain driving assembly, the chain driven assembly and the chain are characterized in that the chain driven assembly comprises a movable box body, a driven sprocket, a tension driving motor and a tension driving mechanism, the movable box body is provided with a movable top cover capable of sliding along a transmission direction on the top thereof, the driven sprocket and the tension driving motor are distributed on the upper and lower sides of the movable top cover, and the driven sprocket is connected with the tension driving motor through a sprocket shaft; the tension driving mechanism is installed on the side wall of the movable box body, and a driving shaft is connected with the movable top cover.

2. The film stretching machine with a sprocket tensioning mechanism according to claim 1, characterized in that: The sprocket shaft is provided with a bearing, the bearing is provided with a bearing sleeve, the bearing sleeve is provided with a positioning boss, and the positioning boss is connected with the movable top cover.

3. The film stretching machine with a sprocket tensioning mechanism according to claim 2, characterized in that: The sprocket shaft is connected with the output shaft of the tension driving motor through a coupling; an upper pressing plate is connected above the bearing sleeve, a lower pressing plate is connected below the bearing sleeve, and a connecting sleeve is connected below the lower pressing plate.

4. A film stretching machine with a sprocket tensioning mechanism according to any one of claims 1-3, characterized in that: The bottom plate of the movable box body is provided with a movable opening allowing the driven sprocket to move; the top of the side plate of the movable box body is slidingly connected with the movable top cover, and the movable top cover is provided with a connecting vertical plate at one end close to the tension driving mechanism.

5. The film stretching machine with a sprocket tensioning mechanism according to claim 4, characterized in that: The top of the two opposite side plates of the movable box body is connected with the movable top cover through a linear guide rail.

6. The film stretching machine with a sprocket tensioning mechanism according to claim 4, characterized in that: The tension driving mechanism is a pneumatic cylinder, and the piston rod of the pneumatic cylinder is connected with the connecting vertical plate through a movable joint.

7. The film stretching machine with a sprocket tensioning mechanism according to claim 3, characterized in that: An oil seal is arranged between the upper pressing plate, the lower pressing plate and the sprocket shaft.

8. The film stretching machine with a sprocket tensioning mechanism according to claim 1, characterized in that: The movable box body further comprises a fixed top cover, and the fixed top cover is arranged on the side close to the tension driving mechanism.

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