A tightening head device for a biaxially stretched film winder

Abstract

The present invention discloses a tightening head device of a biaxially stretched film winder, comprising a fixed sleeve, a sliding sleeve, a sliding shaft transverse bearing assembly, and a cylinder, wherein the cylinder is axially penetrated by a rotating shaft; a transmission assembly for driving the rotating shaft to rotate is provided on the cylinder body of the cylinder, and the cylinder is used to drive the sliding sleeve and the sliding shaft to move laterally together, one end of the sliding shaft is transmission-connected with the rotating shaft, and the other end of the sliding shaft extends out of the sliding sleeve and is provided with a chuck. The tightening head device provided by the present invention sets the cylinder at the rear end of the fixed sleeve and is connected to the fixed sleeve by screws to form an integral body, eliminating the restriction of the side of the fixed sleeve on the cylinder diameter size of the cylinder. Such a setting, on the one hand, allows the cylinder to have sufficient installation space, so that the cylinder diameter can be set to a suitable size, ensuring that sufficient traction is provided to the chuck.

Description

Technical Field

[0001] The invention relates to the technical field of biaxially stretched film winding, in particular to a tightening head device of a biaxially stretched film winding machine. Background Art

[0002] At present, the tightening head device used to tighten the winding shaft in the winding machine generally adopts the tightening head device of the winding mechanism of the cast film machine disclosed in the existing Chinese patent (Announcement No. CN 201116244Y). The tightening head device uses the cylinder as the driving force. Due to the limited installation space, the cylinder diameter of the external cylinder is small, resulting in that when the diameter of the winding film is greater than 800mm, the weight of the film roll is large, and the output force of the cylinder is insufficient, resulting in the cylinder not being able to work normally, and the chuck cannot be smoothly separated from the winding shaft. In addition, since the external cylinder is connected to the sliding shaft through the connecting shaft and the sliding seat, if the coaxiality of the connecting shaft and the sliding shaft is inconsistent, the winding shaft is prone to shaking during operation, resulting in unstable rotation.

[0003] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a tightening head device for a biaxially stretched film winder, aiming to arrange the cylinder on the rear side of the sliding shaft and connect them to form an integral whole, with sufficient installation space for installing a cylinder with a large cylinder diameter, so that the cylinder has sufficient output force to pull the sliding shaft to move, thereby allowing the chuck to smoothly detach from the winding shaft.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A tightening head device for a biaxially stretched film winder comprises a fixed sleeve with a horizontal mounting cavity, a sliding sleeve arranged in the horizontal mounting cavity and capable of laterally moving relative to the fixed sleeve, a sliding shaft arranged in the sliding sleeve and capable of rotating relative to the sliding sleeve, a transverse bearing assembly arranged between the sliding shaft and the sliding sleeve, and a cylinder arranged at the rear end of the fixed sleeve, wherein the cylinder is axially penetrated by a rotating shaft; a transmission assembly for driving the rotating shaft to rotate is provided on the cylinder body of the cylinder, and the cylinder is used to drive the sliding sleeve and the sliding shaft to move laterally together, one end of the sliding shaft is transmission-connected to the rotating shaft, and the other end of the sliding shaft extends out of the sliding sleeve and is provided with a chuck.

[0007] The cylinder comprises an outer cylinder body, an inner cylinder body arranged in the outer cylinder body, a piston arranged between the outer cylinder body and the inner cylinder body, and a piston push shaft fixedly connected to the piston. The inner cylinder body is sleeved outside the rotating shaft, and the front end of the piston push shaft is fixedly connected to the sliding sleeve.

[0008] The cylinder also includes a front end cover arranged at the front end of the outer cylinder body and a rear end cover arranged at the rear end of the outer cylinder body; the cavity located between the inner cylinder body, the piston, the outer cylinder body, and the rear end cover forms an axial cavity, and the cavity located between the piston push shaft, the piston, the outer cylinder body, and the front end cover forms a non-axial cavity.

[0009] The transmission assembly includes a receiving sleeve fixedly arranged at the rear end of the cylinder body of the cylinder, and a synchronous wheel rotatably arranged on the outer periphery of the receiving sleeve; the rear end of the rotating shaft is rotatably connected to the receiving sleeve, and the synchronous wheel is transmission-connected to the rear end of the rotating shaft through a cover plate.

[0010] The front end of the rotating shaft is a spline shaft, the rear end of the sliding shaft is provided with an avoidance hole for the spline shaft to be inserted, and the rear end of the sliding shaft is fixed with a spline sleeve, and the spline sleeve is adaptably connected to the spline shaft.

[0011] The sliding sleeve and the sliding shaft are connected via bearings, and the bearings include a plane bearing located at the rear end of the sliding shaft and a self-aligning bearing located at the front end of the sliding shaft.

[0012] The transverse bearing assembly comprises a positioning sleeve sleeved outside the sliding shaft, and a thrust bearing arranged between the positioning sleeve and the sliding sleeve; the positioning sleeve is arranged between the plane bearing and the self-aligning bearing.

[0013] A positioning key is arranged on the outer wall of the clamp.

[0014] The front end portion of the chuck is a frustum with a gradually decreasing diameter.

[0015] A maintenance port is provided at the rear end of the fixed sleeve, a lubricating oil replenishing channel connected to the plane bearing is provided on the sliding sleeve, and an oil cup is provided at the entrance of the lubricating oil replenishing channel.

[0016] Beneficial effects:

[0017] Compared with the prior art, the tightening head device of the biaxially stretched film winder provided by the present invention sets the cylinder at the rear end of the fixed sleeve and connects the fixed sleeve with the fixed sleeve through screws to form an integral whole, eliminating the limitation of the side of the fixed sleeve on the cylinder diameter size. On the one hand, such a setting enables the cylinder to have sufficient installation space, so that the cylinder diameter can be set to an appropriate size, even if the diameter and weight of the wound film roll are large, it can ensure that sufficient traction is provided to the chuck to meet the winding requirements; on the other hand, the setting of the connecting shaft and the sliding seat is cancelled, which not only allows the space on the side of the fixed sleeve to be replaced by other components of the winder, making the overall structure of the winder more compact, but also eliminates the shaking effect of the connecting shaft structure on the winding shaft, effectively improving the winding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1This is a schematic structural diagram of the tightening head device provided by the present invention when the take-up shaft is not tightened.

[0019] Figure 2 This is a schematic structural diagram of the tightening head device provided by the present invention when tightening the take-up shaft.

[0020] Explanation of the main component symbols: 1-fixed sleeve, 2-sliding sleeve, 3-sliding shaft, 4-transverse bearing assembly, 5-cylinder, 6-rotating shaft, 7-chuck, 8-reeling shaft, 51-outer cylinder body, 52-inner cylinder body, 53-piston, 54-piston push shaft, 55-front cover, 56-rear cover, 57-with shaft cavity, 58-without shaft cavity, 9-transmission assembly, 91-receiving sleeve, 92-synchronizing wheel, 93-cover plate, 61-spline shaft, 31-spline sleeve, 32-plane bearing, 33-self-aligning bearing, 41-positioning sleeve, 42-thrust bearing, 71-positioning key, 81-installation recess, 11-maintenance port, 12-oil cup. DETAILED DESCRIPTION

[0021] The present invention provides a tightening head device for a biaxially stretched film winder. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the scope of protection of the present invention.

[0022] See also Figure 1 and Figure 2 The present invention provides a tightening head device for a biaxially stretched film winder. In this article, "front" refers to the direction of the sliding shaft 3 toward the winding shaft 8, and "rear" refers to the direction opposite to the "front".

[0023] The tightening head device of the biaxially stretched film winder comprises a fixed sleeve 1 with a horizontal installation cavity, a sliding sleeve 2 arranged in the horizontal installation cavity and capable of lateral movement relative to the fixed sleeve 1, a sliding shaft 3 arranged in the sliding sleeve 2 and capable of rotation relative to the sliding sleeve 2, a transverse bearing assembly 4 arranged between the sliding shaft 3 and the sliding sleeve 2, and a cylinder 5 arranged at the rear end of the fixed sleeve 1, wherein the cylinder 5 is axially penetrated by a rotating shaft 6; a transmission assembly 9 for driving the rotating shaft 6 to rotate is arranged on the cylinder body of the cylinder 5, and the cylinder 5 is used to drive the sliding sleeve 2 and the sliding shaft 3 to move laterally together, one end of the sliding shaft 3 is transmission-connected with the rotating shaft 6, and the other end of the sliding shaft 3 extends out of the sliding sleeve 2 and is provided with a chuck 7. It should be noted that in the winder, a tightening head device is respectively provided at both ends of the winding shaft 8, and a mounting recess 81 adapted to the chuck 7 is provided at both ends of the winding shaft 8; the chucks 7 on the two tightening head devices are inserted into the mounting recess 81 together to achieve tightening of the winding shaft 8.

[0024] The working principle is briefly described as follows: when changing the roll, the piston push shaft 54 ​​of the air source driving the air cylinder 5 extends forward, driving the sliding sleeve 2 and the sliding shaft 3 to move forward synchronously, so that the chuck 7 is stuck in the installation recess of the new winding shaft 8 (there is no film wrapped on the winding shaft 8) and presses the end of the new winding shaft 8, so that the winding shaft 8 and the chuck 7 are tightly connected; then the winding drive device drives the rotating shaft 6 to rotate through the transmission assembly 9, thereby driving the sliding shaft 3 and the chuck 7 to rotate, and then drives the winding shaft 8 to realize film winding, so that the winding diameter of the film roll gradually increases. When the film roll reaches the preset winding diameter, the winding shaft 8 stops winding, and the piston push shaft 54 ​​of the air source driving the air cylinder 5 retracts backward, thereby driving the sliding sleeve 2 and the sliding shaft 3 to move backward synchronously, and the chuck 7 is separated from the winding shaft 8.

[0025] Compared with the existing tightening head device, the cylinder 5 is arranged at the rear end of the fixed sleeve 1 and is connected to the fixed sleeve 1 by screws to form an integral body, eliminating the limitation of the side of the fixed sleeve 1 on the cylinder diameter size of the cylinder 5 (it can be understood that in the existing tightening head device, if the cylinder body of the cylinder 5 is enlarged, the cylinder body will interfere with the fixed sleeve or other components of the winder). On the one hand, this arrangement allows the cylinder 5 to have sufficient installation space, so that the cylinder diameter of the cylinder 5 can be set to an appropriate size, even if the diameter and weight of the wound film are large, it can ensure that sufficient traction is provided to the chuck 7; on the other hand, the arrangement of the connecting shaft and the sliding seat is cancelled, which not only allows the space on the side of the fixed sleeve 1 to be replaced by other components of the winder, making the overall structure of the winder more compact, but also eliminates the shaking effect of the connecting shaft structure on the winding shaft 8, effectively improving the winding quality.

[0026] Specifically, the cylinder 5 includes an outer cylinder body 51, an inner cylinder body 52 disposed in the outer cylinder body 51, a piston 53 disposed between the outer cylinder body 51 and the inner cylinder body 52, and a piston push shaft 54 ​​fixedly connected to the piston 53. The inner cylinder body 52 is sleeved outside the rotating shaft 6, and the front end of the piston push shaft 54 ​​is fixedly connected to the sliding sleeve 2. Here, the piston push shaft 54 ​​is a hollow stepped shaft, one end of the piston push shaft 54 ​​is screwed to the sliding sleeve 2, and the other end is also screwed to the piston 53, so that even if the piston 53 push rod is damaged or needs to be replaced with a piston 53 push rod of other lengths, it is easy to replace.

[0027] Furthermore, the cylinder 5 further comprises a front end cover 55 disposed at the front end of the outer cylinder body 51 and a rear end cover 56 disposed at the rear end of the outer cylinder body 51; the cavity between the inner cylinder body 52, the piston 53, the outer cylinder body 51 and the rear end cover 56 forms an axial cavity 57 (see Figure 1 The cavity between the piston push shaft 54, the piston 53, the outer cylinder body 51 and the front end cover 55 forms a shaftless cavity 58 (see Figure 2As shown). The corresponding rear end cover 56 is provided with an air inlet connector, and the front end cover 55 is provided with an air outlet connector; both the air inlet connector and the air outlet connector are connected to the air source. When compressed air is input into the shaft cavity 57 and the shaft cavity 58 is not exhausted, the pressure difference between the two cavities acts on the piston 53 to form a force that pushes the piston 53 to move, so that the piston push shaft 54 ​​extends; when the shaft cavity 57 is inlet and the shaft cavity 58 is not exhausted, the piston push shaft 54 ​​is retracted. Due to the sufficient installation space, the cylinder body adopts a large cylinder diameter design to ensure that the piston push shaft 54 ​​has sufficient thrust and pulling force to drive the chuck 7 to move back and forth horizontally.

[0028] Preferably, the transmission assembly 9 includes a receiving sleeve 91 fixedly arranged at the rear end of the cylinder body of the cylinder 5, and a synchronous wheel 92 rotatably arranged on the outer periphery of the receiving sleeve 91; the rear end of the rotating shaft 6 is rotatably connected to the receiving sleeve 91, and the synchronous wheel 92 is transmission-connected to the rear end of the rotating shaft 6 through a cover plate 93, and the cover plate 93 is connected to the rotating shaft 6 and the synchronous wheel 92 by screw connection. The synchronous wheel 92 is connected to the output end of the winding drive device in the winding machine through a synchronous belt, and the winding drive device drives the synchronous wheel to rotate, thereby driving the rotating shaft 6 and the sliding shaft 3 to rotate, and then providing winding power for the winding shaft 8.

[0029] Preferably, the front end of the rotating shaft 6 is a spline shaft 61, the rear end of the sliding shaft 3 is provided with an avoidance hole 35 for the spline shaft 61 to be inserted, and the rear end of the sliding shaft 3 is fixed with a spline sleeve 31, and the spline sleeve 31 is adaptively connected to the spline shaft 61. The spline sleeve 31 can guide the lateral movement of the spline shaft 61 on the one hand, and on the other hand, it has more key teeth and a larger contact surface, so it can transmit a larger torque and better drive the winding shaft 8 to wind up a film roll with a large winding diameter.

[0030] Preferably, the sliding sleeve 2 and the sliding shaft 3 are connected via bearings, and the bearings include a plane bearing 32 located at the rear end of the sliding shaft 3 and a self-aligning bearing 33 located at the front end of the sliding shaft 3. The plane bearing 32 and the self-aligning bearing 33 together bear the radial load of the sliding shaft 3, and the radial load is mainly the gravity of the film roll. Since the self-aligning bearing 33 has self-aligning performance and can withstand a large radial load, it can compensate for the coaxiality error between the sliding shaft 3 and the winding shaft 8, so it can achieve automatic self-alignment, reducing the difficulty of assembling the chuck 7 and the winding shaft 8.

[0031] Preferably, the transverse bearing assembly 4 includes a positioning sleeve 41 sleeved outside the sliding shaft 3, and a thrust bearing 42 arranged between the positioning sleeve 41 and the sliding sleeve 2; the positioning sleeve 41 is arranged between the plane bearing 32 and the self-aligning bearing 33, and the positioning sleeve 41 is clearance-matched with the sliding shaft 3. The thrust bearing 42 is used to bear the axial traction force of the sliding sleeve 2 on the sliding shaft 3. During actual installation, the front end of the sliding sleeve 2 is provided with a stepped installation cavity, and the thrust bearing 42 and the self-aligning bearing 33 are arranged in the stepped installation cavity. The front end of the fixed sleeve 1 is provided with a sealing cover, and the sealing cover presses the self-aligning bearing 33, the positioning sleeve 41, and the thrust bearing 42 against the stepped shaft shoulder of the sliding sleeve 2.

[0032] As a preferred solution, a positioning key 71 is provided on the outer wall of the chuck 7, and a key slot 72 matching the positioning key 71 is provided on the corresponding winding shaft 8. During assembly, the positioning key 71 cooperates with the key slot 72 to achieve key connection, thereby achieving radial positioning of the winding shaft 8. During actual assembly, the sliding shaft 3 is inserted into the mounting recess 81 and connected to the chuck 7 by key connection to achieve radial positioning; the front end surface of the chuck 7 is connected to the sliding shaft 3 by screws to achieve axial positioning.

[0033] Preferably, the front end of the chuck 7 is a truncated cone with a gradually decreasing diameter. The guiding inclined surface on the truncated cone guides and corrects the winding shaft 8, making it easier for the chuck 7 to fit the mounting recess 81 and reducing the difficulty of assembly.

[0034] Preferably, a maintenance port 11 is provided at the rear end of the fixed sleeve 1, a lubricating oil replenishing channel connected to the plane bearing 32 is provided on the sliding sleeve 2, and an oil cup 12 is provided at the entrance of the lubricating oil replenishing channel. The lubricating oil can be regularly replenished to the bearing and the sliding sleeve 2 through the oil cup 12, which is convenient and quick, and can better reduce friction, resist wear, and resist corrosion and rust of the sleeve.

[0035] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A tightening head device for a biaxially stretched film winder, characterized in that: The invention comprises a fixed sleeve with a horizontal mounting cavity, a sliding sleeve arranged in the horizontal mounting cavity and capable of lateral movement relative to the fixed sleeve, a sliding shaft arranged in the sliding sleeve and capable of rotation relative to the sliding sleeve, a lateral movement receiving assembly arranged between the sliding shaft and the sliding sleeve, and a cylinder arranged at the rear end of the fixed sleeve, wherein the cylinder is axially penetrated by a rotating shaft; a transmission assembly for driving the rotating shaft to rotate is arranged on the cylinder body of the cylinder, and the cylinder is used to drive the sliding sleeve and the sliding shaft to move lateral together, one end of the sliding shaft is transmission-connected to the rotating shaft, and the other end of the sliding shaft extends out of the sliding sleeve and is provided with a chuck; the cylinder comprises an outer cylinder body, an inner cylinder body arranged in the outer cylinder body, a piston arranged between the outer cylinder body and the inner cylinder body, and a piston connected to the outer cylinder body. A piston push shaft fixedly connected to the piston; the inner cylinder body is sleeved outside the rotating shaft, and the front end of the piston push shaft is fixedly connected to the sliding sleeve; the transmission assembly includes a socket sleeve fixedly arranged at the rear end of the cylinder body of the cylinder, and a synchronous wheel rotatably arranged on the outer periphery of the socket sleeve; the rear end of the rotating shaft is rotationally connected to the socket sleeve, and the synchronous wheel is transmission-connected to the rear end of the rotating shaft through a cover plate; the sliding sleeve and the sliding shaft are connected through bearings, and the bearings include a plane bearing located at the rear end of the sliding shaft, and a self-aligning bearing located at the front end of the sliding shaft; the transverse displacement receiving assembly includes a positioning sleeve sleeved outside the sliding shaft, and a thrust bearing arranged between the positioning sleeve and the sliding sleeve; the positioning sleeve is arranged between the plane bearing and the self-aligning bearing.

2. The tightening head device of the biaxially stretched film winder according to claim 1, characterized in that: The cylinder also includes a front end cover arranged at the front end of the outer cylinder body and a rear end cover arranged at the rear end of the outer cylinder body; the cavity located between the inner cylinder body, the piston, the outer cylinder body, and the rear end cover forms an axial cavity, and the cavity located between the piston push shaft, the piston, the outer cylinder body, and the front end cover forms a non-axial cavity.

3. The tightening head device of the biaxially stretched film winder according to claim 1, characterized in that: The front end of the rotating shaft is a spline shaft, the rear end of the sliding shaft is provided with an avoidance hole for the spline shaft to be inserted, and the rear end of the sliding shaft is fixed with a spline sleeve, and the spline sleeve is adaptably connected to the spline shaft.

4. The tightening head device of the biaxially stretched film winder according to claim 1, characterized in that: A positioning key is arranged on the outer wall of the clamp.

5. The tightening head device of the biaxially stretched film winder according to claim 1, characterized in that: The front end portion of the chuck is a frustum with a gradually decreasing diameter.

6. The tightening head device of the biaxially oriented film winder according to claim 1, characterized in that: A maintenance port is provided at the rear end of the fixed sleeve, a lubricating oil replenishing channel connected to the plane bearing is provided on the sliding sleeve, and an oil cup is provided at the entrance of the lubricating oil replenishing channel.

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