A kind of air gap adjusting device for forming roller and die head of plastic film unit

Abstract

The application discloses a forming roller and die gap adjusting device for a plastic film unit, which is used for adjusting the distance between a forming roller and a die of a film unit and comprises a base frame, a wall plate rotatably connected to one side of the base frame and a lifter assembly fixedly connected to the other side of the base frame; the forming roller is rotatably connected to the wall plate; the die is located above the forming roller; the lifter assembly is hingedly connected to the other end of the wall plate; and an anti-collision limiting device is arranged between the wall plate and the die. The two lifters can lift the wall plates at the two ends of the forming roller, rotate around the rotating shaft assembly, and then adjust the distance between the forming roller and the die, so that the length and position of the air gap can be optimized according to specific film materials, production processes and product requirements, manual adjustment is replaced, the efficiency is improved, and manpower is saved.

Description

Technical Field

[0001] This utility model belongs to the field of film machinery technology, and specifically relates to a forming roller and die head air gap adjustment device for plastic film production line. Background Technology

[0002] The distance between the die lip and the forming roller is called the air gap. The main functions of the die air gap include controlling the cooling rate, film thickness distribution, mechanical properties, optical properties, removal of volatile substances, and stabilizing the product shape. The size of the air gap needs to be determined based on the specific film material, production process, and product requirements to determine the flow tangent position and ensure a suitable air gap. Initially, we manually adjusted the distance between the die lip and the forming roller, which was quite cumbersome.

[0003] Among the existing patents, application number CN201110023570.9, entitled "A Cast Film Extruder," includes a forming roller assembly frame, on which a forming roller assembly is mounted. An extrusion base is connected to the left and right sides of the forming roller assembly frame, and an extrusion device that can move left and right on the extrusion base is mounted on the extrusion base. This application does not disclose how to adjust the distance between the forming roller and the extrusion device (equivalent to the die head), which is incomplete. Utility Model Content

[0004] The purpose of this invention is to provide a device for adjusting the air gap between the forming roller and the die head in a plastic film production line. This device can adjust the distance between the forming roller and the die head by machine, thereby adjusting the air gap between the die head and the forming roller to ensure the quality of the film. It replaces the original manual operation and saves manpower.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A device for adjusting the air gap between the forming roller and the die head in a plastic film forming machine is provided. The device includes a base frame, a wall plate rotatably connected to one side of the base frame, and a lifting assembly fixedly connected to the other side of the base frame. The forming roller is rotatably connected to the wall plate. The die head is located above the forming roller. The lifting assembly is hinged to the other end of the wall plate.

[0007] Furthermore, the lifting assembly includes a lifting device fixedly connected to the base frame, a hinge device connected to the lifting end of the lifting device and the wall panel respectively, and a driving device for driving the lifting device to lift.

[0008] Furthermore, the hinge device includes a connecting plate, one end of which is rotatably connected to the lifting end via a first hinge shaft; the other end of which is rotatably connected to the wall panel via a second hinge shaft.

[0009] Furthermore, the drive device includes a coupling that is driven by the lifting device, a reducer that is driven by the coupling, and a motor that is driven by the reducer.

[0010] Furthermore, there are two wall panels, which are respectively located on both sides of the base frame; the two ends of the forming roller are rotatably connected to the wall panels on both sides of the base frame; there are two lifting devices, which are respectively hinged to the two wall panels; a synchronization device is provided between the two lifting devices.

[0011] Furthermore, the synchronization device includes a second coupling that is drivenly connected to one of the lifting devices, a first drive shaft that is fixedly connected to the second coupling, and a second drive shaft that is drivenly connected to the first drive shaft via a third coupling; the second drive shaft is drivenly connected to the other lifting device via a fourth coupling.

[0012] Furthermore, the end of the wall panel equipped with the lifting device is provided with a limiting device to prevent the forming roller from colliding with the die head.

[0013] Furthermore, the limiting device includes a limiting post fixedly installed on the wall panel, a bracket fixedly installed on the base frame, and an upper limit switch and a lower limit switch fixed on the bracket; the limiting post is located between the upper limit switch and the lower limit switch.

[0014] Furthermore, a track is fixedly connected to the ground, and the base frame is equipped with wheels; the wheels are rotatably connected to the track; a positioning device is provided between the base frame and the track to prevent the base frame from shaking.

[0015] Compared with the prior art, the significant beneficial effects achieved by this application are as follows:

[0016] By using two lifting devices, the wall plates at both ends of the forming roller can be lifted and swung around the rotating shaft assembly. This allows for adjustment of the distance between the forming roller and the die head, enabling the optimization of the air gap length and position based on specific film materials, production processes, and product requirements. This replaces the previous manual adjustment, improving efficiency and saving manpower.

[0017] With the synchronization device in place, a set of reducer and motor can be used to drive two lifting devices to lift and lower at the same time, avoiding the problem of uneven spacing between the forming roller and the die head caused by the two lifting devices being out of sync.

[0018] The hinge device prevents the lift from jamming with the wall panel during lifting.

[0019] By setting a limiting device, collisions between the wall panel and the mold head are prevented when the wall panel swings. Attached Figure Description

[0020] Figure 1This is a schematic front view of the structure of this application;

[0021] Figure 2 This is a schematic left view of the structure of this application;

[0022] Figure 3 for Figure 2 Enlarged view of point A;

[0023] Figure 4 for Figure 2 Enlarged view of point B;

[0024] Figure 5 This is a schematic diagram of the synchronization device.

[0025] Figure 6 This is a schematic diagram of the elevator installation.

[0026] Figure 7 This is a schematic diagram of the limiting device.

[0027] Figure 8 This is a schematic diagram of the installation of the limit device and the lifting assembly;

[0028] Figure 9 This is a schematic diagram of the shaft assembly.

[0029] In the attached diagram,

[0030] 1-Die head, 2-Forming roller, 3-Wall panel

[0031] 4-Shaft assembly, 41-Shaft, 42-Support, 43-Bearing, 44-End cap, 45-Oil cup;

[0032] 5-Limit device, 81-Bracket, 82-Lower limit switch, 83-Upper limit switch, 84-Limit post;

[0033] 6-Lifting device assembly, 61-Motor, 62-Reducer, 63-Coupling, 64-Lifting device, 641-Lifting end, 642-Connecting plate, 643-First hinge shaft, 644-Second hinge shaft, 645-First transmission shaft, 646-Bearing housing, 647-Third coupling, 648-Second coupling;

[0034] 7-Railway, 8-Base frame. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0036] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0037] Example 1

[0038] like Figures 1-8 As shown,

[0039] A device for adjusting the air gap between the forming roller 2 and the die head 1 of a plastic film forming machine is provided. The device includes a base frame 8, a wall plate 3 rotatably connected to one side of the base frame 8 via a rotating shaft assembly 4, and a lifting assembly 6 fixedly connected to the other side of the base frame 8. The forming roller 2 is rotatably connected to the wall plate 3. The die head 1 is located above the forming roller 2. The lifting assembly 6 is hinged to the other end of the wall plate 3.

[0040] The detailed structure is as follows: the lifting assembly 6 includes a lifting device 64 whose housing is fixedly connected to the base frame 8, a hinge device that is connected to the lifting end 641 of the lifting device 64 and the wall panel 3 respectively, and a driving device for driving the lifting device 64 to lift; the lifting end 641 of the lifting device 64 can only lift in a straight line and cannot rotate to avoid jamming with the wall panel 3.

[0041] like Figure 3 As shown, the hinge device includes a connecting plate 642. One end of the connecting plate 642 is rotatably connected to the lifting end 641 via a first hinge shaft 643; the other end of the connecting plate 642 is rotatably connected to the wall panel 3 via a second hinge shaft 644. The first hinge shaft 643 is fixed or rotatable to the lifting end 641, and the connecting plate 642 is rotatably connected to the first hinge shaft 643.

[0042] like Figure 2 , Figure 6As shown, the drive device includes a coupling 63 that is driven by the lifting device 64, a reducer 62 that is driven by the coupling 63, and a motor 61 that is driven by the reducer 62. The reducer 62 is fixedly connected to the base frame 8 via a bracket; the housing of the motor 61 is fixed to the housing of the reducer 62; the output end of the motor 61 is drivenly connected to the input end of the reducer 62.

[0043] like Figure 2 As shown, there are two wall panels 3, respectively located on both sides of the base frame 8; the two ends of the forming roller 2 are rotatably connected to the wall panels 3 on both sides of the base frame 8; there are two lifting devices 64, each hinged to one of the two wall panels 3; a synchronization device is provided between the two lifting devices 64. The synchronization device is used to raise and lower the two lifting devices 64 simultaneously to avoid tilting of the forming roller 2 due to asynchrony;

[0044] like Figure 2 As shown, the synchronization device includes a second coupling 648 that is drivenly connected to one of the lifting devices 64, a first drive shaft 645 that is fixedly connected to the second coupling 648, and a second drive shaft that is drivenly connected to the first drive shaft 645 through a third coupling 647; the second drive shaft is drivenly connected to the other lifting device 64 through a fourth coupling.

[0045] If the length of forming roller 2 is more than 1.5 meters, using a single drive shaft would be too long and would deform over time. Therefore, a method of using two drive shafts with intermediate support is adopted to overcome the deformation problem. Figure 4 As shown, this application uses a method of installing bearing seats 646 on the base frame 8 to support the transmission shaft. Each transmission shaft is provided with two supporting bearing seats 646 to avoid the transmission shaft from deflecting and deforming.

[0046] During operation, when it is necessary to adjust the gap (air gap) between the forming roller 2 and the die head 1, such as reducing the gap, the motor 61 is started. The motor 61 drives the reducer 62 to rotate. The reducer 62 drives the lifting end 641 of the lifting device 64 to extend through the coupling 63. The lifting end 641 pushes one end of the wall plate 3 upward through the connecting plate 642. The wall plate 3 drives the forming roller 2 closer to the die head 1. When the gap is appropriate, the motor 61 stops rotating. Due to the deceleration of the reducer 62, the lifting of the lifting device 64 is relatively slow and can be judged by visual inspection, or an electronic ruler can be installed and the position can be displayed on the touch screen. If it is necessary to increase the gap between the forming roller 2 and the die head 1, the motor 61 can be reversed.

[0047] Example 2

[0048] The structure of this embodiment is largely the same as that of Embodiment 1.

[0049] The difference is that,

[0050] likeFigure 9 As shown, a pivot assembly 4 is provided between the wall panel 3 and the base frame 8 to achieve a rotatable connection between the two.

[0051] The rotating shaft assembly 4 includes a support 42 that is fixedly connected to the base frame 8 by bolts and nuts. A bearing 43 is installed inside the support 42, and the inner ring of the bearing 43 is tightly fitted with the rotating shaft 41. The rotating shaft 41 is fixedly connected to the wall panel 3, so that the wall panel 3 can swing around the rotating shaft 41. In order to prevent dust from entering the bearing 43, an end cover 44 is provided, and an oil cup 45 is provided on the end cover 44 for lubricating the bearing 43.

[0052] During operation, the lifting end 641 of the lifting device 64 extends out, pushing the connecting plate 642 to move to the upper right. The connecting plate 642 drives one end of the wall plate 3 upward, so that the forming roller 2 gets close to the die head 1, and the air gap between the two becomes smaller. When the lifting end 641 descends, the air gap becomes larger.

[0053] Example 3

[0054] The structure of this embodiment is largely the same as that of embodiment 2.

[0055] The difference is that,

[0056] like Figures 7-8 As shown, the wall panel 3 is provided with a lifting device 64 at one end, which is provided with a limiting device 5 to prevent the forming roller 2 from colliding with the die head 1.

[0057] The limiting device 5 includes a limiting post 84 fixedly installed on the wall panel 3, a bracket 81 fixedly installed on the base frame 8, an upper limit switch 83 and a lower limit switch 82 fixed on the bracket 81; the limiting post 84 is located between the upper limit switch 83 and the lower limit switch 82.

[0058] It also includes a controller, which is connected to the upper limit switch 83, the lower limit switch 82 and the motor 61 respectively. When the limit post 84 approaches one of the two limit switches, the controller receives a signal and sends a stop command to the motor 61 to prevent the forming roller 2 from colliding with the die head 1.

[0059] Currently, the technical solution of this application has undergone pilot testing, which is a small-scale experiment before the product is mass-produced. After the pilot testing was completed, a user survey was conducted on a small scale, and the survey results showed that user satisfaction was high. Now, preparations have begun for the formal production and industrialization of the product (including intellectual property risk warning surveys).

Claims

1. A device for adjusting the air gap between the forming roller and the die head in a plastic film forming machine, used for adjusting the distance between the forming roller (2) and the die head (1) in the film forming machine, characterized in that: It includes a base frame (8), a wall panel (3) rotatably connected to one side of the base frame (8), and a lifting assembly (6) fixedly connected to the other side of the base frame (8); a forming roller (2) rotatably connected to the wall panel (3); a die head (1) located above the forming roller (2); and the lifting assembly (6) hinged to the other end of the wall panel (3).

2. The air gap adjustment device for forming roller and die head of a plastic film forming unit according to claim 1, characterized in that: The lifting assembly (6) includes a lifting device (64) fixedly connected to the base frame (8), a hinge device connected to the lifting end (641) of the lifting device (64) and the wall panel (3) respectively, and a drive device for driving the lifting device (64) to lift.

3. The air gap adjustment device for forming roller and die head of a plastic film forming unit according to claim 2, characterized in that: The hinge device includes a connecting plate (642), one end of which is rotatably connected to the lifting end (641) via a first hinge shaft (643); the other end of which is rotatably connected to the wall panel (3) via a second hinge shaft (644).

4. The air gap adjustment device for forming roller and die head of a plastic film forming unit according to claim 3, characterized in that: The drive device includes a coupling (63) that is driven by the lifting device (64), a reducer (62) that is driven by the coupling (63), and a motor (61) that is driven by the reducer (62). The reducer (62) is fixedly connected to the base frame (8).

5. The air gap adjustment device for forming roller and die head of a plastic film forming unit according to claim 4, characterized in that: There are two wall panels (3), which are respectively located on both sides of the base frame (8); the two ends of the forming roller (2) are rotatably connected to the wall panels (3) on both sides of the base frame (8); there are two lifting devices (64), which are respectively hinged to the two wall panels (3) through two connecting plates (642); a synchronization device is provided between the two lifting devices (64).

6. The air gap adjustment device for forming roller and die head of a plastic film forming unit according to claim 5, characterized in that: The synchronization device includes a second coupling (648) that is driven to one of the lifting devices (64), a first drive shaft (645) that is fixedly connected to the second coupling (648), and a second drive shaft that is driven to the first drive shaft (645) through a third coupling (647); the second drive shaft is driven to the other lifting device (64) through a fourth coupling.

7. The air gap adjustment device for forming roller and die head of a plastic film forming unit according to claim 2, characterized in that: The wall panel (3) is provided with a lifting device (64) at one end, which is provided with a limiting device (5) to prevent the forming roller (2) from colliding with the die head (1).

8. The air gap adjustment device for forming roller and die head of a plastic film forming unit according to claim 7, characterized in that: The limiting device (5) includes a limiting post (84) fixedly installed on the wall panel (3), a bracket (81) fixedly installed on the base frame (8), an upper limit switch (83) and a lower limit switch (82) fixedly installed on the bracket (81); the limiting post (84) is located between the upper limit switch (83) and the lower limit switch (82).

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