Stretching device for biaxially stretching electrostatic film
Through the cooperation of the loosenable membrane clamp and the screw slide mechanism, the bidirectional stretching of the membrane raw materials is achieved, which solves the problem of uneven stress in the edge of the membrane body, and ensures uniform deformation and mechanical strength of the membrane body.
Patent Information
- Application Number
- CN202422193653.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-09
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-09-09
AI Technical Summary
During the stretching process of existing bidirectional stretching machines, performance differences at the edges of the membrane body due to uneven internal stress, and may even tear, making uniform deformation impossible.
The loosenable membrane clamp and screw slide mechanism are used to combine the electric push rod to achieve bidirectional tensile of the membrane raw material through intermittent clamping and loosening, and deformation occurs under the action of internal stress to prevent the membrane from falling off.
Effectively remove internal stress, ensure that the film body deformation is more uniform, prevents tear, and improves the mechanical strength and transparency of the film body.
Smart Images
Figure CN223173557U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of stretching devices, in particular to a stretching device for a biaxially stretched electrostatic film. Background Technique
[0002] The biaxially stretched electrostatic film, abbreviated as the biaxially stretched antistatic film, is a film material with antistatic function produced by the biaxial stretching process. This film is stretched simultaneously in the longitudinal and transverse directions of the plastic film, so that the molecular chains are oriented and arranged in the direction parallel to the film plane, thereby improving the mechanical strength, transparency and other properties of the film, and endowing it with antistatic characteristics by adding antistatic agents or adopting conductive coating technology.
[0003] In the existing biaxial stretching machine for the production of antistatic films, its principle is usually to clamp the edge of the film body material by a clamp, and then perform simultaneous biaxial stretching on it to form a film under tension. During the entire stretching process, the clamp usually always clamps on the film body to keep the stretching going on. This results in that the film body at the clamped part is always unable to deform, while the film body raw materials in other parts undergo significant deformation. In the above situation, since the film body at the clamped part hardly deforms, while the film body under tension undergoes significant deformation, a large internal stress will be generated due to extremely uneven volume changes at the junction of the two parts, that is, at the edge position of the clamp of the film body. Moreover, the magnitude of this internal stress will increase with the deepening of the stretching degree, making the performance of this part of the film body different, and even prone to tearing at this part during stretching. Therefore, in view of the above problems, a stretching device for a biaxially stretched electrostatic film is proposed. Content of the Utility Model
[0004] The technical problem to be solved by the utility model is to provide a stretching device for a biaxially stretched electrostatic film. This stretching device can clamp and fix the edge of the film raw material through a loosenable film clamp. Specifically, when the electric push rod works to press down the movable clamping plate to approach the bottom of the C-shaped clamping plate, the film raw material placed between the two is clamped. Subsequently, the loosenable film clamp moves outward under the drive of the lead screw sliding table mechanism to realize the biaxial stretching of the film raw material. During this process, the lead screw sliding table mechanism stops moving for a short time every time it moves a certain distance. At this time, the electric push rod works to slightly lift the movable clamping plate, so that the currently clamped part can be released, and then it can deform to a certain extent under the action of internal stress, effectively removing the internal stress and making the deformation more uniform. And during this process, the anti-disengagement telescopic shaft can press on the film body in the form of point pressing, which can prevent the film body from falling off the loosenable film clamp while hardly hindering its deformation and releasing internal stress, solving the technical problem that in the prior art, when the film body is stretched, a large internal stress will be generated due to extremely uneven volume changes in the film body near the edge position of the clamp, resulting in different performances of this part of the film body, and even prone to tearing at this part during stretching.
[0005] The technical solution adopted by the embodiments of the present application to solve its technical problems is as follows:
[0006] A stretching device for a biaxially stretched electrostatic film, comprising a substrate, on which a number of screw rod sliding table mechanisms are installed, a loosenable film clamp for clamping a film body and driven by the screw rod sliding table mechanism. Among them, the loosenable film clamp includes a C-shaped clamping plate. An electric push rod is installed on the upper part of the C-shaped clamping plate through an L-shaped mounting plate. The output shaft of the electric push rod is fixedly connected to a communicating cylinder. The bottom end of the communicating cylinder is fixedly connected with a movable clamping plate. And a tension spring is sleeved on the front end of the electric push rod. An anti-detachment telescopic shaft that can pass through the movable clamping plate is slidably arranged in the communicating cylinder.
[0007] Through the above structural form, the electric push rod works to press down the movable clamping plate to make it approach the bottom of the C-shaped clamping plate, and then clamp the film raw material placed between the two. Subsequently, the loosenable film clamp moves outward under the drive of the screw rod sliding table mechanism to realize the biaxial stretching of the film raw material. During this process, the screw rod sliding table mechanism stops moving for a short period of time every time it moves a certain distance. At this time, the electric push rod is powered off and drives the movable clamping plate to lift slightly under the pulling action of the tension spring, so that the currently clamped part can be released, and then it can deform to a certain extent under the action of internal stress, which effectively removes the internal stress and makes the deformation more uniform. And during this process, the anti-detachment telescopic shaft can press the film body in the form of point pressure, which can prevent the film body from falling off the loosenable film clamp while minimizing the hindrance to its deformation and the release of internal stress.
[0008] In a possible implementation manner, limiting chute grooves are opened on both sides of the communicating cylinder. Sliding guide blocks are fixedly arranged on both sides of the end of the anti-detachment telescopic shaft, and the sliding guide blocks are slidably arranged in the limiting chute grooves.
[0009] Through the above structural form, it provides a necessary structural basis for the sliding connection between the anti-detachment telescopic shaft and the communicating cylinder, and can also play a role in limiting the stroke of the anti-detachment telescopic shaft.
[0010] In a possible implementation manner, a groove is opened at the inner top of the communicating cylinder, and a reset spring is fixedly connected in the groove. The bottom end of the reset spring is fixedly connected to the anti-detachment telescopic shaft.
[0011] Through the above structural form, when the electric push rod works to lift the movable clamping plate slightly, due to the thrust of the reset spring, the anti-detachment telescopic shaft will be pushed outwards, so that its end can always press the film body, thereby avoiding the film body from falling off the loosenable film clamp under the action of gravity.
[0012] In a possible implementation manner, the depth of the groove is numerically greater than the length when the reset spring is completely compressed. At the same time, a thickened circular plate is fixedly arranged at the top end of the communicating cylinder, and the output shaft of the electric push rod is fixedly connected to the thickened circular plate.
[0013] With the above structural form, it can be ensured that when the anti - detachment telescopic shaft retracts to the maximum stroke, the return spring can be completely located in the groove, avoiding the influence of the existence of the return spring on the maximum retraction stroke of the anti - detachment telescopic shaft. At the same time, the thickened disc can strengthen the top of the communication cylinder, offsetting the structural weakening caused by the opening of the groove.
[0014] In a possible implementation manner, the screw - rod sliding - table mechanism includes a guide rail. A sliding table fixedly connected to the bottom of the C - shaped clamping plate is slidably arranged in the guide rail. A driving motor is fixedly installed at the end of the guide rail, and an output shaft of the driving motor is fixedly connected to a transmission screw rod threadedly connected to the sliding table.
[0015] With the above structural form, the driving motor drives the transmission screw rod to rotate. Under the action of screw - thread transmission, the sliding table is driven to move, and finally the loosenable membrane clip is driven to move outward by the sliding table, playing a stretching role on the membrane body.
[0016] In a possible implementation manner, horizontal guide grooves are formed on both sides of the sliding table, and guide strips are arranged on the inner walls of both sides of the guide rail. Among them, the guide grooves are clamped on the guide strips and are in sliding contact with the guide strips.
[0017] With the above structural form, the combination of the guide grooves and the guide strips can work to guide the sliding of the sliding table, so that the sliding table can only slide along the guide strips under the driving action of the transmission screw rod, avoiding deviation and affecting the stretching effect on the membrane body.
[0018] In a possible implementation manner, an inclined reinforcing support plate is fixedly connected to the sliding table, and the top end of the reinforcing support plate is fixedly connected to the outer wall of the C - shaped clamping plate.
[0019] With the above structural form, the reinforcing support plate can enhance the firmness of the connection between the sliding table and the C - shaped clamping plate, avoiding the inability to firmly connect between the two due to the rear - setting of the sliding table.
[0020] In a possible implementation manner, guide rods are fixedly arranged at the dead - angle positions of the upper end surface of the movable clamping plate, and the guide rods are slidably arranged in the C - shaped clamping plate.
[0021] With the above structural form, the guide rods can play a role in restricting the movement of the movable clamping plate, so that it can only move up and down along the sliding direction of the guide rods under the drive of the electric push rod, thereby ensuring that it can always be flush with the bottom plate of the C - shaped clamping plate and ensuring the firmness of clamping.
[0022] In summary, the present utility model has the following beneficial technical effects:
[0023] The electric push rod works to press down the movable clamping plate to make it approach the bottom of the C-shaped clamping plate, thereby clamping the film raw material placed between the two. Subsequently, the film clamp can be loosened and moved outward under the drive of the screw rod sliding table mechanism to realize the biaxial stretching of the film raw material. During the above process, the screw rod sliding table mechanism stops moving for a short period of time every time it moves a certain distance. At this time, the electric push rod is powered off and drives the movable clamping plate to lift slightly under the pulling action of the tension spring, so that the currently clamped part can be released, and then it can deform to a certain extent under the action of internal stress, which effectively removes the internal stress and makes the deformation more uniform. And during this process, the anti-detachment telescopic shaft can press on the film body in the form of point pressing, which can prevent the film body from falling off the loosenable film clamp while minimizing the hindrance to its deformation and the release of internal stress. Description of the Drawings
[0024] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the drawings:
[0025] Figure 1 is a schematic diagram of the overall structure of the present invention;
[0026] Figure 2 is a schematic diagram of the stretching structure of the present invention;
[0027] Figure 3 is a schematic diagram of the loosenable film clamp structure of the present invention;
[0028] Figure 4 is a schematic diagram of the partial structure of the loosenable film clamp of the present invention;
[0029] Figure 5 is a schematic diagram of the screw rod sliding table mechanism structure of the present invention.
[0030] In the figure: 1, substrate; 2, screw rod sliding table mechanism; 21, guide rail; 211, guide strip; 22, drive motor; 23, sliding table; 231, guide groove; 24, transmission screw rod; 25, strengthening support plate; 3, loosenable film clamp; 31, C-shaped clamping plate; 32, L-shaped mounting plate; 33, electric push rod; 331, tension spring; 34, connecting cylinder; 341, limiting sliding groove; 35, movable clamping plate; 36, anti-detachment telescopic shaft; 361, sliding guide block; 362, return spring; 37, guide rod. Detailed Embodiment
[0031] The technical solutions in the embodiments of the present application are to solve the problems in the above-mentioned background technology, and the general idea is as follows:
[0032] As Figure 1 - Figure 3As shown in the figure, a stretching device for a biaxially stretched electrostatic film provided in this embodiment includes a substrate 1, on which a number of screw slide mechanisms 2 are installed, and a loosenable film clamp 3 for clamping the film body and driven by the screw slide mechanism 2. Among them, the loosenable film clamp 3 includes a C-shaped clamping plate 31. An electric push rod 33 is installed on the upper part of the C-shaped clamping plate 31 through an L-shaped mounting plate 32. The output shaft of the electric push rod 33 is fixedly connected to a communication cylinder 34. The bottom end of the communication cylinder 34 is fixedly connected to a movable clamping plate 35. And a tension spring 331 is sleeved on the front end of the electric push rod 33. An anti-drop telescopic shaft 36 that can pass through the movable clamping plate 35 is slidably arranged in the communication cylinder 34. Through the above structural form, when the electric push rod 33 works and presses down the movable clamping plate 35 to approach the bottom of the C-shaped clamping plate 31, the film raw material placed between the two is clamped. Subsequently, the loosenable film clamp 3 moves outward under the drive of the screw slide mechanism 2 to realize the biaxial stretching of the film raw material. During this process, the screw slide mechanism 2 stops moving for a short period of time every time it moves a certain distance. At this time, the electric push rod 33 is powered off and drives the movable clamping plate 35 to lift slightly under the pulling action of the tension spring 331, so that the currently clamped part can be released, and then it can deform to a certain extent under the action of internal stress, playing an effective role in removing internal stress and making the deformation more uniform. And during this process, the anti-drop telescopic shaft 36 can press on the film body in the form of point pressing, which can prevent the film body from falling off the loosenable film clamp 3 while not hindering its deformation and releasing internal stress as much as possible.
[0033] In order to ensure that there is no self-locking situation after the electric push rod 33 is powered off, so that the tension spring 331 can pull its rod end back, the electric push rod 33 needs to have no self-locking function. An electric push rod 33 that purely uses a ball screw for lifting or only adds a gear set (generally a bevel gear) at the input end can be used to ensure that it can slide after being powered off and has no self-locking function.
[0034] Among them, the screw slide mechanism 2 includes a guide rail 21. A sliding table 23 fixedly connected to the bottom of the C-shaped clamping plate 31 is slidably arranged in the guide rail 21. A driving motor 22 is fixedly installed at the end of the guide rail 21. The output shaft of the driving motor 22 is fixedly connected to a transmission screw rod 24 threadedly connected to the sliding table 23. Through the above structural form, the driving motor 22 drives the transmission screw rod 24 to rotate, and under the action of screw transmission, the sliding table 23 is driven to move, and finally the loosenable film clamp 3 is driven by the sliding table 23 to move outward to stretch the film body.
[0035] In order to enable the lead screw sliding table mechanism 2 to stop moving for a short period of time every time it moves a certain distance, and at this time the movable clamping plate 35 can be lifted, this stretching device needs to cooperate with a circuit. This circuit includes contact pieces, electromagnetic relays, time relays and an external power supply. Among them, multiple contact pieces are provided at the bottom of the groove of the guide rail 21, and one contact piece is provided at the bottom of the sliding table 23. And when the sliding table 23 slides, the contact piece at its bottom can respectively contact the contact pieces at the bottom of the groove of the guide rail 21 one by one. At the same time, the time relay is an air damping type time relay with adjustable delay time.
[0036] Among them, the electromagnetic relay is usually connected in a working circuit in a closed state, while the time relay is usually connected in another working circuit in an open state. The above two working circuits are both for power supply to the electric push rod 33 and the driving motor 22. At the same time, the two relays are connected in parallel in the same control circuit, and the contact pieces described above are connected in series in this control circuit.
[0037] Based on the above circuit, when the stretching device works, the electric push rod 33 works to clamp the film body and at the same time the driving motor 22 stretches the film body. At this time, the working circuit where the electromagnetic relay is located supplies power to the electric push rod 33 and the driving motor 22. As the sliding table 23 slides, when the contact piece on it contacts the contact piece at the bottom of the groove of the guide rail 21, the control circuit is turned on. At this time, both the electromagnetic relay and the time relay change their working states. Among them, the electromagnetic relay switches to the open state, so that the working circuit where it is located no longer supplies power to the electric push rod 33 and the driving motor 22. At this time, the electric push rod 33 and the driving motor 22 are in a power-off and stop working state, so as to realize that the lead screw sliding table mechanism 2 can stop moving for a short period of time every time it moves a certain distance. And at this time, the end of the electric push rod 33 moves upward under the action of the tension spring 331, lifting the movable clamping plate 35 slightly. Then, after reaching the delay time set by the time relay, the working circuit where it is located supplies power to the electric push rod 33 and the driving motor 22, so that the stretching work continues. When the contact pieces are separated, the time relay switches to the open state, and the electromagnetic relay switches to the connected state, so that the entire circuit returns to the initial state, and further enables the circuit to change cyclically.
[0038] As Figure 4 shown, limited position sliding grooves 341 are provided on both sides of the connecting cylinder 34. Sliding guide blocks 361 are fixedly provided on both sides of the end of the anti-disengagement telescopic shaft 36, and the sliding guide blocks 361 are slidably arranged in the limited position sliding grooves 341. Through the above structural form, it provides a necessary structural basis for the sliding connection between the anti-disengagement telescopic shaft 36 and the connecting cylinder 34, and at the same time can also play a role in limiting the stroke of the anti-disengagement telescopic shaft 36.
[0039] Among them, a groove is formed at the inner top of the connecting cylinder 34, and a return spring 362 is fixedly connected in the groove. The bottom end of the return spring 362 is fixedly connected to the anti - detachment telescopic shaft 36. Through the above - mentioned structural form, when the electric push rod 33 works to slightly lift the movable clamping plate 35, due to the thrust of the return spring 362, the anti - detachment telescopic shaft 36 will be pushed outwards, so that its end can always press the film body, thereby preventing the film body from falling off the loosenable film clip 3 under the action of gravity.
[0040] In addition, the depth of the groove is numerically greater than the length of the return spring 362 when it is completely compressed. At the same time, a thickened circular plate is fixedly arranged at the top end of the connecting cylinder 34, and the output shaft of the electric push rod 33 is fixedly connected to the thickened circular plate. Through the above - mentioned structural form, it can be ensured that when the anti - detachment telescopic shaft 36 retracts to the maximum stroke, the return spring 362 can be completely located in the groove, avoiding the influence of the existence of the return spring 362 on the maximum retraction stroke of the anti - detachment telescopic shaft 36. At the same time, the thickened circular plate can strengthen the top of the connecting cylinder 34 and offset the structural weakening caused by the opening of the groove.
[0041] As Figure 2 、 Figure 5 shown, horizontal guide grooves 231 are formed on both sides of the sliding table 23, and guide strips 211 are arranged on the inner walls of both sides of the guide rail 21. Among them, the guide grooves 231 are clamped on the guide strips 211, and the guide grooves 231 are in sliding contact with the guide strips 211. Through the above - mentioned structural form, the combination of the guide grooves 231 and the guide strips 211 can work to guide the sliding of the sliding table 23, so that the sliding table 23 can only slide along the guide strips 211 under the driving action of the transmission lead screw 2,4, avoiding deviation and affecting the stretching effect of the film body.
[0042] As Figure 5 shown, an inclined reinforcing support plate 25 is fixedly connected to the sliding table 23, and the top end of the reinforcing support plate 25 is fixedly connected to the outer wall of the C - shaped clamping plate 31. Through the above - mentioned structural form, the reinforcing support plate 25 can enhance the firmness of the connection between the sliding table 23 and the C - shaped clamping plate 31, avoiding the inability to firmly connect between the two due to the rear position of the sliding table 23.
[0043] As Figure 3 shown, guide rods 37 are fixedly arranged at the dead - angle positions on the upper end surface of the movable clamping plate 35, and the guide rods 37 are slidably arranged in the C - shaped clamping plate 31. Through the above - mentioned structural form, the guide rods 37 can restrict the movement of the movable clamping plate 35, so that it can only move up and down along the sliding direction of the guide rods 37 under the driving of the electric push rod 33, thereby ensuring that it can always be flush with the bottom plate of the C - shaped clamping plate 31 and ensuring the firmness of clamping.
[0044] The working principle and process of the present utility model:
[0045] The edge of the film raw material is clamped and fixed by the loosenable film clamp 3. Specifically, the electric push rod 33 works to press down the movable clamping plate 35 to make it approach the bottom of the C-shaped clamping plate 31, thereby clamping the film raw material placed between the two. Subsequently, the loosenable film clamp 3 moves outward under the drive of the lead screw slide mechanism 2 to realize the biaxial stretching of the film raw material.
[0046] In the above process, the lead screw slide mechanism 2 stops moving for a short period of time every time it moves a certain distance. At this time, the electric push rod 33 works to slightly lift the movable clamping plate 35 to release the currently clamped part, so that it can deform to a certain extent under the action of internal stress, effectively removing the internal stress and making the deformation more uniform. And during this process, the anti-detachment telescopic shaft 36 can press on the film body in the form of point pressing, which can prevent the film body from falling off the loosenable film clamp 3 while minimizing the hindrance to its deformation and stress release.
[0047] Finally, it should be noted that: Obviously, the above embodiments are only examples for clearly explaining the present invention, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.
Claims
1. A stretching device for a biaxially stretched electrostatic film, characterized in that, Including: A substrate (1) on which a number of lead screw slide mechanisms (2) are mounted; A releasable film clamp (3) for clamping a film body and driven by the lead screw slide mechanism (2); Wherein, the releasable film clamp (3) includes a C-shaped clamping plate (31), an electric push rod (33) is mounted on the upper part of the C-shaped clamping plate (31) through an L-shaped mounting plate (32), the output shaft of the electric push rod (33) is fixedly connected to a communicating cylinder (34), the bottom end of the communicating cylinder (34) is fixedly connected to a movable clamping plate (35), and a tension spring (331) is sleeved on the front end of the electric push rod (33); A anti-disengagement telescopic shaft (36) capable of passing through the movable clamping plate (35) is slidably arranged in the communicating cylinder (34).
2. The stretching device for a biaxially stretched electrostatic film according to claim 1, characterized in that: Limiting sliding grooves (341) are formed on both sides of the communicating cylinder (34), sliding guide blocks (361) are fixedly arranged on both sides of the end of the anti-disengagement telescopic shaft (36), and the sliding guide blocks (361) are slidably arranged in the limiting sliding grooves (341).
3. The stretching device for a biaxially stretched electrostatic film according to claim 1, wherein: A groove is formed on the inner top of the communicating cylinder (34), a return spring (362) is fixedly connected in the groove, and the bottom end of the return spring (362) is fixedly connected to the anti-disengagement telescopic shaft (36).
4. A stretching device for a biaxially stretched electrostatic film according to claim 3, characterized in that: The depth of the groove is numerically greater than the length when the return spring (362) is completely compressed. At the same time, a thickened circular plate is fixedly arranged at the top end of the communicating cylinder (34), and the output shaft of the electric push rod (33) is fixedly connected to the thickened circular plate.
5. The stretching device for a biaxially stretched electrostatic film according to claim 1, wherein: The lead screw slide mechanism (2) includes a guide rail (21), a sliding table (23) fixedly connected to the bottom of the C-shaped clamping plate (31) is slidably arranged in the guide rail (21), a driving motor (22) is fixedly installed at the end of the guide rail (21), and the output shaft of the driving motor (22) is fixedly connected to a transmission lead screw (24) threadedly connected to the sliding table (23).
6. The stretching device for a biaxially stretched electrostatic film according to claim 5, wherein: Horizontal guide grooves (231) are formed on both sides of the sliding table (23), guide strips (211) are arranged on the inner walls of both sides of the guide rail (21), wherein, the guide grooves (231) are clamped on the guide strips (211), and the guide grooves (231) are in sliding contact with the guide strips (211).
7. The stretching device for a biaxially stretched electrostatic film according to claim 5, characterized in that: An inclined reinforcing support plate (25) is fixedly connected to the sliding table (23), and the top end of the reinforcing support plate (25) is fixedly connected to the outer wall of the C-shaped clamping plate (31).
8. The stretching device for a biaxially stretched electrostatic film according to claim 1, characterized in that: Guide rods (37) are fixedly arranged at the dead corners of the upper end surface of the movable clamping plate (35), and the guide rods (37) are slidably arranged in the C-shaped clamping plate (31).