Closed-loop controlled film stretching device and spin coating system

Abstract

The utility model discloses a closed-loop control film stretching device and a spin coating system, and the device comprises a parameter setting panel which is used for setting target stretching parameters of a film; the clamping mechanism is used for clamping the film; the driving mechanism is connected with the clamping mechanism and used for driving the clamping mechanism to move in the plane so as to apply drawing force to the film; the feedback module is used for monitoring the output state of the driving mechanism in real time and generating a feedback signal; and the control module is connected with the parameter setting panel and the feedback module, and the control module is configured to dynamically adjust the output of the driving mechanism based on the deviation between the target stretching parameter and a feedback signal so as to realize the closed-loop control of the film stretching force. Target stretching parameters are input through the parameter setting panel, the feedback module is combined to monitor the output state of the driving mechanism in real time, the control module can dynamically adjust the driving mechanism based on the deviation between a set value and a feedback value, and it is ensured that the stretching parameters always meet the set requirement.

Description

Technical Field

[0001] This utility model relates to the field of materials preparation technology, specifically to a closed-loop controlled film stretching device and spin coating system. Background Technology

[0002] A film stretching device is a apparatus used to stretch thin films. Its main function is to uniformly stretch the film to better adapt it to various application requirements. Film stretching mechanisms have broad application prospects in packaging, printing, electronics, medical, and materials preparation, among other fields. Their structural designs vary depending on the specific needs of different industries. In the field of materials preparation, especially in the fabrication of ultrathin, uniform material coatings on flexible substrates, this is a crucial process. This process is highly dependent on the film stretching mechanism, requiring uniformity of the stretching force and precise control over the stretching.

[0003] Film stretching devices typically clamp and secure the film around its perimeter using side clamps, and then lift and press the film against a central platform to increase its prestress and bring it into a stretched state. While this method achieves film stretching, the contact between the platform applying the prestress and the film can cause damage, potentially affecting film quality.

[0004] To address this, Chinese invention patent CN108760496B discloses an involute-type multiaxial tensile testing machine for flexible materials. This machine uses an involute guide groove and a linear guide groove to drive the clamps in synchronous motion, achieving multiaxial tensile testing of the material. The involute trajectory design reduces motion friction, ensuring the synchronization and uniformity of the tensile force. While this device can achieve uniform stretching of the film to some extent, it lacks feedback control over the film stretching process. The stretching speed and tensile force cannot be effectively guaranteed, making it unsuitable for the tensile force requirements of different film materials and thicknesses. Different specifications of films require different tensile forces; if the tensile force and stretching speed cannot be adjusted in real time, the final stretched film quality will be poor. Utility Model Content

[0005] In view of this, the present invention provides a closed-loop controlled film stretching device and spin coating system to solve the problem that current tensile testing machines lack feedback control over the film stretching process.

[0006] In a first aspect, this utility model provides a closed-loop controlled membrane stretching device, comprising:

[0007] The parameter setting panel is used to set the target stretching parameters of the film;

[0008] A clamping mechanism used to clamp the film;

[0009] A driving mechanism connected with the clamping mechanism, used to drive the clamping mechanism to move in the plane to apply a stretching force to the film;

[0010] A feedback module used to monitor the output state of the driving mechanism in real time and generate a feedback signal;

[0011] A control module connected with the parameter setting panel and the feedback module, the control module being configured to dynamically adjust the output of the driving mechanism based on the deviation of the target stretching parameter and the feedback signal to achieve closed-loop control of the film stretching force.

[0012] The film stretching device with closed-loop control has the beneficial effects that the target stretching parameter is input through the parameter setting panel, the output state of the driving mechanism is monitored in real time by the feedback module, and the control module can dynamically adjust the driving mechanism based on the deviation of the set value and the feedback value. When the actual stretching force is lower than the target value, the driving force output is automatically increased, and vice versa, so that the stretching parameter always meets the set requirement. The automatic closed-loop control reduces manual intervention and avoids parameter fluctuations caused by insufficient experience or operation delay in traditional manual adjustment. The utility model realizes accurate setting, dynamic adjustment and real-time correction of the film stretching parameter through closed-loop control, and solves the problems of film damage, poor adaptability and low consistency caused by lack of feedback control in traditional film stretching devices.

[0013] The feedback module continuously collects data, and the control module quickly responds through the PID algorithm to stabilize the output parameter within the target range. The closed-loop control ensures that the stretching conditions of each batch of film are consistent, avoiding batch differences caused by equipment aging or environmental changes in traditional open-loop control.

[0014] In an alternative embodiment, the driving mechanism comprises:

[0015] A motor;

[0016] A transmission assembly connected with the output shaft of the motor;

[0017] The clamping mechanism comprises a plurality of clamping assemblies, each of which is uniformly and circumferentially spaced on the transmission assembly and synchronously moves away from the center position of the film under the driving of the transmission assembly to tighten the film.

[0018] In an alternative embodiment, the feedback module comprises a torque sensor, one end of the torque sensor being connected with the output shaft of the motor, and the other end of the torque sensor being connected with the input end of the transmission assembly through a connecting shaft;

[0019] The parameter setting panel is configured to set the target torque required for film stretching, and the control module is configured to dynamically adjust the output of the driving mechanism based on the deviation of the target torque and the torque signal feedback by the torque sensor.

[0020] When the detected torque is less than the target torque, it indicates that the transmission assembly rotates too fast at this time, and the stability of the transmission assembly is poor. If the film is directly stretched, the film is easy to be damaged. Therefore, the motor is controlled to reduce the speed by the control module. When the detected torque is greater than the target torque, it indicates that the transmission assembly rotates too slowly at this time, and if the film is directly stretched, the expected stretching effect cannot be achieved. Therefore, the motor is controlled to increase the speed by the control module.

[0021] In an optional embodiment, the feedback module further comprises a tension sensor, one end of the tension sensor is connected with the clamping assembly, and the other end of the tension sensor is connected with the edge of the film.

[0022] The control module is configured to dynamically adjust the output of the driving mechanism based on the deviation between the target stretching parameter and the tension signal fed back by the tension sensor.

[0023] When the detected tension is greater than the target stretching parameter, it indicates that the stretching force on the film is too large at this time, and if the film is directly stretched, the film is easy to be damaged. Therefore, the motor is controlled to reduce the speed by the control module. When the detected tension is less than the target stretching parameter, it indicates that the transmission assembly rotates too slowly at this time, and if the film is directly stretched, the expected stretching effect cannot be achieved. Therefore, the motor is controlled to increase the speed by the control module.

[0024] In an optional embodiment, the closed-loop control film stretching device further comprises a frame body, the frame body comprises a positioning disc and a supporting leg, the positioning disc is horizontally arranged, and the supporting leg is arranged below the positioning disc. The clamping mechanism and the driving mechanism are both connected to the positioning disc.

[0025] In an optional embodiment, the transmission assembly comprises:

[0026] A driving gear coaxially connected with the output shaft of the motor and rotationally arranged in the positioning disc;

[0027] A driven gear engaged with the driving gear and rotationally arranged in the positioning disc, a plurality of involute tooth profile tracks are circumferentially and spaced apart on the driven gear;

[0028] A plurality of straight tracks are circumferentially and spaced apart on the positioning disc, the straight tracks are arranged along the radial direction of the driven gear, and each clamping assembly is slidingly arranged in the straight track and the involute tooth profile track through the positioning shaft arranged at the bottom end of the clamping assembly.

[0029] The beneficial effects of the above technical solutions are that the combination of the involute tooth profile track and the linear track enables high-precision position control of the clamping assembly during movement. The involute tooth profile track provides accurate angle conversion, and the linear track ensures the accuracy of the radial position. The combination of the linear track and the involute tooth profile track enables the driven gear to drive the positioning shaft and the clamping assembly to move linearly when rotating, i.e., the rotational motion of the driven gear is converted into linear motion of the clamping assembly, thereby achieving effective force transmission. Moreover, since the linear track is arranged radially, a radial tension is generated on the film when the film is stretched, the radial tension passes through the center of the film, and the film is uniformly stretched in multiple directions, thereby preventing the film from being twisted during stretching.

[0030] In an alternative embodiment, the positioning disc is divided into an upper cover plate, a lower cover plate, and a side frame, and the upper cover plate and the lower cover plate are both provided with linear tracks; the positioning shaft sequentially passes through the linear track of the upper cover plate, the involute tooth profile track, and the linear track of the lower cover plate from top to bottom, and is limited by a limiting piece.

[0031] In an alternative embodiment, the outer diameter of the driving gear is smaller than the outer diameter of the driven gear. Through the design of the speed reduction ratio of the driving gear and the driven gear, the motor torque is amplified, and a larger stretching load can be borne; and since the rotational speed of the driven gear is smaller than that of the driving gear, the moving speed of the clamping assembly is relatively small, which can prevent the film from being damaged due to being pulled too fast, and the speed reduction and torque increase enable the driven gear to drive the clamping assembly to move more smoothly. Through gear set speed reduction and torque increase, the film stretching rate and the size of the pre-stress can be controlled.

[0032] In an alternative embodiment, the clamping assembly comprises:

[0033] The positioning frame comprises a top plate, a bottom plate, and side plates, the side plates are connected to the side walls of the top plate and the bottom plate, respectively, and the top plate, the bottom plate, and the side plates surround a frame structure with an open side;

[0034] The telescopic member has a fixed end at the top end and is positioned on the bottom wall of the top plate, and has a telescopic end at the bottom end and forms a film positioning gap with the top wall of the bottom plate.

[0035] In an alternative embodiment, the telescopic member is a gas pump cylinder, the telescopic end of the gas pump cylinder is provided with a pressure sensor for detecting the pressure on the film, and the gas inlet end of the gas pump cylinder is provided with a pressure regulating valve.

[0036] The parameter setting panel is configured to be able to set the target pressure parameter of the film.

[0037] The control module is configured to dynamically adjust the output of the pressure regulating valve based on a deviation of the target tension parameter from the detected pressure signal to achieve closed-loop control of the film pressure.

[0038] In an alternative embodiment, a friction felt piece is vertically arranged on the bottom wall of the top plate of the positioning frame, and a bottom end of the friction felt piece is a free end.

[0039] In an alternative embodiment, the top end of the bottom plate is provided with an anti-skid pad, and the telescopic end of the telescopic member is provided with a flexible pad arranged in correspondence with the anti-skid pad.

[0040] In a second aspect, the utility model provides a spin coating system, it includes:

[0041] The closed-loop control film stretching device;

[0042] A spin coating device is used to coat a coating layer on the film after the film stretching device stretches the film.

[0043] The spin coating system has the same beneficial effects as the closed-loop control film stretching device, which will not be repeated here.

[0044] In summary, the technical scheme of the utility model has the following advantages:

[0045] Semi-automation: the semi-automatic film stretching mechanism designed by the utility model clamps and fixes the edges of the film through multiple air pumps, and sets the film stretching rate and pre-tightening force through a control panel, thereby realizing automatic control of the film stretching process, saving manpower, reducing labor intensity, and improving production efficiency.

[0046] Precise control of pre-tightening force: the film stretching mechanism stretching speed and stretching force controlled by the stepping motor speed and torque sensor feedback data can accurately control the pre-tightening force, avoiding the problem of film damage caused by the contact between the top of the pre-tightening force applying platform and the film in the prior art, thereby improving the quality of the film. At the same time, it has a large speed and torque adjustment range.

[0047] Rich application scenarios: the involute profile track driven clamp of the utility model can run continuously and stably, which can effectively control the stretching force to adapt to films of various materials, expand its application range in the preparation of different materials, and improve its applicability.

[0048] Uniformity control: the step motor rotating drive gear of the utility model rotates, drives multiple air pump clamps to move along the designed involute track, stretches the film from different directions, can control the uniformity of the force of the film in each direction, avoids the problem that the uniformity of the force of the film in each direction cannot be controlled in the prior art, thereby improves the uniformity of the film stretching, and further improves the final coating quality.

[0049] Overall, compared with the prior art, the utility model has the advantages of semi-automation, accurate control of prestress, rich application scenarios and uniformity control, and is an ideal semi-automatic film stretching mechanism special for material preparation. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below, 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 creative labor.

[0051] Figure 1 It is a first view structural schematic drawing of a closed-loop control film stretching device provided by the utility model;

[0052] Figure 2 It is a second view structural schematic drawing of a closed-loop control film stretching device provided by the utility model;

[0053] Figure 3 It is an explosion drawing of a closed-loop control film stretching device provided by the utility model;

[0054] Figure 4 It is a sectional view of a closed-loop control film stretching device provided by the utility model;

[0055] Figure 5 It is a local structural schematic drawing of a closed-loop control film stretching device provided by the utility model;

[0056] Figure 6 It is a connection schematic drawing of a positioning frame and a positioning shaft of a closed-loop control film stretching device provided by the utility model;

[0057] Figure 7 It is a feedback flow chart of a closed-loop control film stretching device provided by the utility model.

[0058] BRIEF DESCRIPTION OF DRAWINGS

[0059] 1, motor, 2, motor cover plate, 3, lower cover plate, 4, torque sensor, 5, connecting shaft, 6, drive gear, 7, driven gear, 71, involute tooth profile track, 8, upper cover plate, 10, positioning frame, 101, non-slip pad, 11, air pump cylinder, 111, flexible pad, 12, air pump guide pipe, 13, friction felt piece, 14, frame, 141, positioning disc, 142, leg, 143, linear track, 15, guide sleeve, 16, gasket, 17, first bolt, 18, first positioning pin, 19, second positioning pin, 20, second bolt, 21, third bolt, 22, elastic check ring, 23, positioning shaft, 231, limiting piece. DETAILED DESCRIPTION

[0060] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0061] The existing film stretching mechanism mainly clamps the film around through side clamps, and then lifts the middle carrier to press the film, so as to increase the prestress of the film and make the film enter the stretched state. Although this method can realize the stretching of the film, it has some limitations. First, the contact between the prestress applying carrier and the film causes damage to the film, which may affect the quality of the film. Second, the force applied by the mechanical movement cannot be controlled, and the uniformity of the force in each direction of the film cannot be controlled, which may cause uneven stretching of the film and affect the final coating quality. Third, the stretching force cannot be effectively controlled to adapt to films made of different materials, which limits its application in the preparation of different materials. Finally, manual operation is required throughout the process, which not only increases the labor intensity, but also affects the production efficiency. Therefore, it is of great significance to design a material preparation special-purpose semi-automatic film stretching mechanism that can accurately control the prestress and is suitable for a wide range of applications.

[0062] To solve the problem of film damage, the utility model uses an air pump clamp to clamp the edges of the film, avoiding direct contact with the film and reducing the possibility of film damage.

[0063] To solve the problem of force uniformity control, the utility model sets the film stretching rate and prestress through the control panel, and controls the stretching speed and stretching force of the film stretching mechanism through the stepping motor speed and torque sensor feedback data, thereby realizing accurate control of the force in each direction of the film.

[0064] For the adaptability problem, the utility model discloses a continuous stable operation through the design of involute tooth profile track drive clamp, can adapt to various different material's film, thereby expand its in material preparation field's application range.

[0065] For the automation degree problem, the utility model discloses a semi -automatic operation, saves manpower, improves production efficiency.

[0066] The utility model discloses a material preparation special -purpose semi -automatic film -stretching mechanism of accurate control prestress, applicable scene is rich. Below in combination with the closed -loop control's film -stretching device of the utility model first aspect and the spin -coating system of the utility model second aspect elaborate the specific embodiment of the utility model.

[0067] According to the embodiment of the utility model, first, a kind of closed -loop control's film -stretching device is provided, in combination Figures 1 to 7 As shown in the figure, including parameter setting panel, clamping mechanism, drive mechanism, feedback module and control module.Parameter setting panel is used to set the target tensile parameter of film.Clamping mechanism is used to clamp film, drive mechanism is connected with clamping mechanism, is used to drive clamping mechanism to move in plane, to exert multi -direction tensile force to film.Feedback module is used to monitor the output state of drive mechanism in real time and generates feedback signal.Control module connects parameter setting panel and feedback module, control module is configured as based on the deviation of target tensile parameter and feedback signal, dynamically adjusts the output of drive mechanism, to realize the closed -loop control of film tensile force.Control module is hardware module, can be controller, also can be control panel.

[0068] The above-mentioned closed -loop control's film -stretching device, input target tensile parameter through parameter setting panel, in combination feedback module real -time monitoring the output state of drive mechanism, control module can dynamically adjust drive mechanism based on the deviation of set value and feedback value.When actual tensile force is lower than target value, automatically increase drive force output, otherwise reduce, to ensure that tensile parameter always maintains set requirement.Automation closed -loop control reduces manual intervention, avoids the parameter fluctuation caused by insufficient experience or operation delay in traditional manual adjustment.The utility model realizes the accurate setting, dynamic adjustment and real -time correction of film tensile parameter through closed -loop control, solves the film damage, poor adaptability, low consistency and other problems caused by lack of feedback control in traditional film -stretching device.

[0069] Feedback module continuously collects data, and control module responds quickly through PID algorithm, so that output parameter is stable in target range.Closed -loop control guarantees the tensile condition of each batch of film to be consistent, avoids the batch difference caused by equipment aging or environmental change in traditional open -loop control.

[0070] In some embodiments, the driving mechanism comprises a motor 1 and a transmission assembly. The motor 1 is a stepper motor. The motor is connected to a motor cover plate 2 through a first bolt 17, a gasket 16 and a guide sleeve 15. The motor cover plate 2 is also connected to a lower cover plate 3 through a bolt, a gasket and a guide sleeve. The first bolt 17 is an M3 bolt. The transmission assembly is connected to the output shaft of the motor 1. The transmission assembly is configured to convert the rotary motion of the motor into linear or curved motion of the clamping assembly.

[0071] The clamping mechanism comprises a plurality of clamping assemblies for clamping the film. The clamping assemblies are evenly spaced circumferentially on the transmission assembly and are synchronously moved away from the center of the film under the driving of the transmission assembly to tighten the film.

[0072] In this embodiment, the driving mechanism applies force in multiple directions synchronously, and the real-time monitoring of the feedback module ensures uniform distribution of the stretching force, avoiding excessive local stress or film tearing caused by traditional single-point jacking.

[0073] In some embodiments, the feedback module comprises a torque sensor 4. One end of the torque sensor 4 is connected to the output shaft of the motor 1 through a first positioning pin 18. The other end of the torque sensor 4 is connected to a connecting shaft 5 through a flange interface. The connecting shaft 5 is connected to the input end of the transmission assembly. More specifically, the connecting shaft is fixedly connected to the drive gear 6 through a second positioning pin 19, driving the drive gear 6 to rotate. The torque sensor 4 is used to monitor the motor driving torque in real time.

[0074] More specifically, one end of the torque sensor 4 is provided with a first recess, and the output shaft of the motor 1 is embedded and fixed in the first recess. The other end of the torque sensor 4 is provided with a second recess, and the connecting shaft 5 is embedded and fixed in the second recess.

[0075] The feedback module also comprises a tension sensor. One end of the tension sensor is connected to the clamping assembly, and the other end of the tension sensor is connected to the edge of the film. One tension sensor can be provided. The clamping assembly can be detected in real time when pulling the film through the tension sensor. The control module is configured to dynamically adjust the output of the driving mechanism based on the deviation between the target stretching parameter and the tension signal feedback by the tension sensor. When the detected tension is greater than the target stretching parameter, it indicates that the stretching force on the film is too large at this time, and if the film is directly stretched, it is easy to cause damage to the film. Therefore, the motor 1 is controlled to reduce the speed by the control module. When the detected tension is less than the target stretching parameter, it indicates that the transmission assembly speed is too slow at this time, and if the film is directly stretched, the expected stretching effect cannot be achieved. Therefore, the motor 1 is controlled to increase the speed by the control module.

[0076] The parameter setting panel is configured to set the target torque required for the film stretching. The control module is configured to dynamically adjust the output of the driving mechanism based on the deviation between the target torque and the torque signal fed back by the torque sensor 4, so as to control the rotation speed of the driven gear and the stability of the transmission assembly, thereby ensuring the uniform stretching of the film. When the detected torque is less than the target torque, it indicates that the rotation speed of the transmission assembly is too fast, and the stability of the transmission assembly is poor. If the film is directly stretched, the film is easy to be damaged. Therefore, the control module controls the motor 1 to reduce the rotation speed. When the detected torque is greater than the target torque, it indicates that the rotation speed of the transmission assembly is too slow, and if the film is directly stretched, the expected stretching effect cannot be achieved. Therefore, the control module controls the motor 1 to increase the rotation speed.

[0077] In some embodiments, the closed-loop control film stretching device further comprises a frame 14, the frame 14 comprises a positioning disc 141 and a supporting leg 142, the positioning disc 141 is horizontally arranged, and the supporting leg 142 is arranged below the positioning disc 141. The clamping mechanism and the driving mechanism are both connected to the positioning disc 141.

[0078] In some embodiments, the transmission assembly comprises a driving gear 6 and a driven gear 7. The driving gear 6 is coaxially connected to the output shaft of the motor, ensuring the efficiency and stability of power transmission and reducing energy loss. The driving gear 6 is rotatably arranged in the positioning disc 141. The driven gear 7 is engaged with the driving gear 6 and is rotatably arranged in the positioning disc 141. More specifically, the driven gear 7 is fixed to the lower cover plate 3 through the positioning shaft of the lower cover plate and rotates around the positioning shaft. The driving gear 6 drives the driven gear 7 to rotate through gear engagement.

[0079] A plurality of involute tooth profile tracks 71 are circumferentially arranged on the driven gear 7. A plurality of straight tracks 143 are circumferentially arranged on the positioning disc 141, and the straight tracks 143 are arranged along the radial direction of the driven gear 7. Each clamping assembly is slidably arranged in the straight track 143 and the involute tooth profile track 71 through the positioning shaft 23 arranged at the bottom end of the clamping assembly.

[0080] In this embodiment, the combination of the involute tooth profile track 71 and the straight track 143 enables high-precision position control of the clamping assembly during movement. The involute tooth profile track provides precise angular conversion, while the straight track ensures the accuracy of the radial position. The combination of the straight track 143 and the involute tooth profile track 71 enables the driven gear 7 to drive the positioning shaft and the clamping assembly to move linearly when rotating, i.e., converting the rotational motion of the driven gear 7 into linear motion of the clamping assembly, achieving efficient force transmission. Moreover, since the straight track 143 is arranged in the radial direction, a radial tension is generated on the film during stretching, which passes through the center of the film, thereby uniformly stretching the film in multiple directions without causing the film to twist during stretching.

[0081] In some embodiments, the positioning disc 141 is divided into an upper cover plate 8, a lower cover plate 3 and a side frame, the upper cover plate 8 is fixed on the lower cover plate 3 by bolts, and the upper cover plate and the lower cover plate are both provided with straight line tracks 143. The supporting leg 142 is fixed on the lower cover plate 3 by the third bolt 21 and serves as a support. The positioning shaft 23 passes through the straight line track of the upper cover plate, the involute profile track 71 and the straight line track of the lower cover plate in sequence from top to bottom and is limited by the limiting sheet 231. The minimum outer diameter of the limiting sheet 231 is greater than the width of the straight line track 143. In this embodiment, the upper part and the lower part of the positioning shaft 23 are both limited by the straight line tracks, so that the problem that the upper part and the lower part of the positioning shaft 23 move out of synchronization does not occur.

[0082] Further, the upper cover plate 8 and the lower cover plate 3 are symmetrically arranged with respect to the driven gear 7, further ensuring the synchronization of the movement of the upper part and the lower part of the positioning shaft 23.

[0083] The positioning frame 10 is stably combined with the straight line tracks of the lower cover plate 3, the driven gear 7 and the upper cover plate 8 through the positioning shaft 23 and the elastic shaft washer 22 and performs reciprocating motion around the straight line tracks.

[0084] In some embodiments, the diameter of the driving gear 6 is smaller than the diameter of the driven gear 7. Through the design of the speed reduction ratio of the driving gear 6 and the driven gear 7, the motor torque is amplified, and a larger tensile load can be borne; and because the rotation speed of the driven gear 7 is smaller than that of the driving gear 6, the movement speed of the clamping assembly is relatively small, which can avoid the damage of the film caused by the film being pulled too fast, and through the speed reduction and torque increase, the movement of the clamping assembly driven by the driven gear 7 is more stable. Through the gear set speed reduction and torque increase, the film stretching rate and the size of the pre-stress can be controlled.

[0085] In some embodiments, the clamping assembly includes a positioning frame 10 and a telescopic piece. The positioning frame 10 includes a top plate, a bottom plate and a side plate, the side plate is connected with the side walls of the top plate and the bottom plate respectively, and the top plate, the bottom plate and the side plate surround a frame structure with an open side. The top end of the telescopic piece is a fixed end and is positioned on the bottom wall of the top plate, and the bottom end of the telescopic piece is a telescopic end and forms a film positioning gap with the top wall of the bottom plate.

[0086] As a specific example, the clamping assembly is a pneumatic clamp, and the telescopic member is a pneumatic cylinder 11. The pneumatic cylinder 11 is fixed to the upper part of the positioning frame 10 by a second bolt 20, which is an M1.5 bolt. The telescopic end of the pneumatic cylinder 11 is provided with a pressure sensor for detecting the pressure on the film. A pressure regulating valve is provided on the pneumatic conduit 12 of the pneumatic cylinder 11, which is fixed to the pneumatic cylinder 11 by a nut. The parameter setting panel is configured to set the target pressure parameter of the film. The control module is configured to dynamically adjust the output of the pressure regulating valve based on the deviation of the target tension parameter and the detected pressure signal, to achieve closed-loop control of the film pressure.

[0087] In this embodiment, the pressure sensor detects the pressure on the film in real time and transmits the signal to the control module. The control module dynamically adjusts the output of the pressure regulating valve based on the deviation between the set target pressure parameter and the actual detected pressure, to ensure that the film is always within the set pressure range. When the detected actual pressure exceeds the set safety threshold, the system can take prompt measures (such as closing the air inlet valve) to prevent the film from being damaged or other safety hazards due to excessive stretching. The closed-loop control system can effectively eliminate the influence of external interference factors (such as temperature changes, mechanical vibrations, etc.) on the stability of the pressure, improving the reliability and accuracy of the system.

[0088] And for different materials of the film, set different target pressure parameters, and then meet the stretching operation of different specifications of the film.

[0089] In some embodiments, a friction felt piece 13 is vertically downwardly arranged on the bottom wall of the top plate of the positioning frame 10. The friction felt piece 13 is adhered to the bottom wall of the top plate of the positioning frame 10, and the bottom end of the friction felt piece 13 is a free end. When the telescopic end of the telescopic member clamps the film, the bottom end of the friction felt piece 13 abuts against the film to provide uniform friction. Due to the softness and compliance of the felt material, it can maintain consistent friction distribution on films of different shapes and thicknesses. Uniform friction helps to prevent the film from slipping or shifting during clamping, ensuring that the film maintains a stable position during stretching or other operations. And the high friction coefficient between the friction felt piece and the film can significantly enhance the clamping force, making the clamping more firm and reliable.

[0090] In some embodiments, the top end of the base plate is provided with a non-slip pad 101, and the telescopic end of the telescopic piece is provided with a flexible pad 111 arranged in correspondence with the non-slip pad 101. The non-slip pad 101 is located at the top end of the base plate and in contact with the film, providing the first layer of non-slip protection; the flexible pad 111 is located at the telescopic end of the telescopic piece and presses the film from above, providing the second layer of non-slip protection. The synergistic effect of the two can effectively prevent the film from slipping or shifting during clamping. The softness of the flexible pad 111 enables it to closely adhere to the surface of the film, ensuring uniform pressure distribution and avoiding local excessive pressure that may cause deformation or damage to the film.

[0091] According to the embodiments of the utility model, the second aspect provides a film stretching method, and the specific implementation steps are as follows:

[0092] Step one: prepare the film and place the film on the platform of the film stretching mechanism. The material of the film can be selected as needed, such as polyimide film, polyester film, etc.

[0093] Step two: use 12 air pump clamps to clamp and fix the edges of the film. The design of the air pump clamp ensures that the film will not be damaged during the stretching process. The pressure of the air pump clamp can be adjusted according to the material and thickness of the film to ensure that the film will not be damaged in the clamp.

[0094] Step three: set the film stretching rate and pre-stress through the control panel. The stretching rate can be set between 0.1 mm / s and 10 mm / s, and the pre-stress can be set between 0.1 N and 100 N.

[0095] Step four: control the stretching speed and stretching force of the film stretching mechanism through the feedback data of the stepping motor speed and torque sensor. The speed of the stepping motor can be set between 10 rpm and 100 rpm, and the feedback data of the torque sensor can adjust the speed of the stepping motor in real time to ensure the uniformity of the stretching force. The specific feedback adjustment process is shown as follows:

[0096] a, set the target value: input the film stretching rate (0.1 mm / s to 10 mm / s) and pre-stress (0.1 N to 100 N) through the control panel. The control system calculates the target speed and torque of the stepping motor according to the input target value.

[0097] b, real-time monitoring: the stepping motor starts to work, and the torque sensor monitors the output torque of the motor in real time.

[0098] The torque sensor transmits the monitored data to the control system.

[0099] c. Data comparison: The control system compares the actual measured torque data with the preset target value. If the actual torque is consistent with the target value, the system continues to operate normally. If there is a deviation, the system enters the feedback adjustment link.

[0100] d. Feedback adjustment: The control system automatically adjusts the speed and output torque of the stepper motor according to the size of the deviation; if the actual torque is less than the target value, the system will reduce the speed or output torque of the stepper motor; if the actual torque is greater than the target value, the system will increase the speed or output torque of the stepper motor.

[0101] e. Closed-loop control: The entire adjustment process forms a closed-loop control system to ensure that the force and speed during the film stretching process remain stable. The system will continue to monitor and adjust until the film stretching is complete.

[0102] Control system algorithm: The control system uses a PID (Proportional-Integral-Derivative) control algorithm that can quickly respond to torque changes to ensure system stability and accuracy.

[0103] User interface: The control panel provides an intuitive user interface, allowing users to easily set stretching parameters and monitor force and speed changes in real time during the stretching process.

[0104] Step five: The stepper motor rotates to drive the gear to rotate, amplifying the motor driving force, and driving the 12 air pump clamps to move along the designed involute trajectory, stretching the film to the preset tension from different directions. The design of the involute profile trajectory makes the movement of the clamp more stable, thereby improving the stability and efficiency of the stretching.

[0105] Step six: After the stretching is completed, the air pump clamps are loosened, and the film is evenly stretched on the positioning disc 141, and the preparation of the coating material can be carried out next. Through the above semi-automatic film stretching mechanism, accurate control of the force in each direction of the film can be achieved, and various films of different materials can also be adapted, improving production efficiency and coating quality.

[0106] According to the embodiments of the present application, in a third aspect, a spin coating system is provided, which comprises a closed-loop controlled film stretching device and a spin coating device. The spin coating device can be arranged above the closed-loop controlled film stretching device, and is used for coating a coating on the film after the film stretching device tightens the film.

[0107] The application scenario of the present application is mainly laboratory film material preparation process and vertical graphene material preparation. The process steps when preparing vertical graphene material are: stretching a flexible substrate, placing the prepared graphene film with nanometer to micrometer thickness on the substrate with pre-tightening force. Water is transferred to the graphene film, and the water is dried to release the clamping force, and the graphene film has a vertical structure.

[0108] Due to the advancement of the utility model, therefore in the material preparation technical field, coating technical field and automation mechanical equipment field and so on application field can have extensive application.

[0109] In the material preparation technical field, the semi-automatic film stretching mechanism can accurately control the stretching rate and pre-stress of the film, ensure uniform stretching of the film, and improve the quality and efficiency of material preparation. At the same time, the continuous and stable operation of the fixture driven by the involute tooth profile track can adapt to various films of different materials, thereby expanding the application range of the semi-automatic film stretching mechanism in the material preparation field.

[0110] In the coating technical field, the semi-automatic film stretching mechanism can accurately control the stretching rate and pre-stress of the film, ensure uniform stretching of the film, and prepare an ultra-thin and uniform material coating. This is of great significance for preparing high-quality coatings, especially in preparing ultra-thin and uniform material coatings on flexible substrates. The utility model has a broad application prospect.

[0111] In the automation mechanical equipment field, the semi-automatic film stretching mechanism of the utility model controls the stretching speed and stretching force of the film stretching mechanism through the feedback data of the stepping motor speed and torque sensor, realizes automatic operation, improves production efficiency, and reduces labor intensity. At the same time, the film edges are clamped and fixed by 12 air pump clamps, which can realize rapid fixation of the film and improve work efficiency.

[0112] Overall, the semi-automatic film stretching mechanism of the utility model has a broad application prospect in the material preparation technical field, coating technical field and automation mechanical equipment field and other application fields, and meets the market demand for efficient, high-quality and automated material preparation.

[0113] Although the embodiments of the utility model are described in combination with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A closed loop controlled taping device, characterized by, The application relates to a closed-loop control film stretching device. The device comprises: a parameter setting panel for setting a target stretching parameter of a film; a clamping mechanism for clamping the film; a driving mechanism connected with the clamping mechanism, for driving the clamping mechanism to move in a plane to apply a stretching force to the film; a feedback module for monitoring the output state of the driving mechanism in real time and generating a feedback signal; 2. The closed loop controlled taping device of claim 1, wherein, a control module connected with the parameter setting panel and the feedback module, the control module being configured to dynamically adjust the output of the driving mechanism based on the deviation between the target stretching parameter and the feedback signal, so as to realize closed-loop control of the film stretching force. The driving mechanism comprises: a motor (1); a transmission assembly connected with the output shaft of the motor (1); 3. A closed loop controlled taping device according to claim 2, wherein, The clamping mechanism comprises a plurality of clamping assemblies, each of which is uniformly and circumferentially spaced on the transmission assembly and synchronously moves away from the center position of the film under the driving of the transmission assembly to tighten the film. The feedback module further comprises a tension sensor, one end of the tension sensor being connected with the clamping assembly, and the other end of the tension sensor being connected with the edge of the film; 4. The closed loop controlled taping device of claim 2, wherein, The control module is configured to dynamically adjust the output of the driving mechanism based on the deviation between the target stretching parameter and the tension signal fed back by the tension sensor. The feedback module comprises a torque sensor (4), one end of the torque sensor (4) being connected with the output shaft of the motor (1), and the other end of the torque sensor (4) being connected with the input end of the transmission assembly through a connecting shaft (5); 5. The closed loop controlled taping device of claim 2, wherein, The parameter setting panel is configured to set a target torque required for film stretching, and the control module is configured to dynamically adjust the output of the driving mechanism based on the deviation between the target torque and the torque signal fed back by the torque sensor (4).

6. A closed loop controlled taping device according to claim 5, wherein, The closed-loop control film stretching device further comprises a frame body (14), the frame body (14) comprising a positioning disc (141) and a supporting leg (142), the positioning disc (141) being horizontally arranged, and the supporting leg (142) being arranged below the positioning disc (141), the clamping mechanism and the driving mechanism both being connected with the positioning disc (141). The transmission assembly comprises: a driving gear (6) coaxially connected with the output shaft of the motor (1) and rotationally arranged in the positioning disc (141); a driven gear (7) engaged with the driving gear (6) and rotationally arranged in the positioning disc (141), a plurality of involute tooth profile tracks (71) being circumferentially and spaced on the driven gear (7); 7. A closed loop controlled taping device according to claim 6, wherein, a plurality of straight tracks (143) being circumferentially and spaced on the positioning disc (141), the straight tracks (143) being arranged along the radial direction of the driven gear (7), and each clamping assembly being slidingly arranged in the straight track (143) and the involute tooth profile track (71) through a positioning shaft (23) arranged at the bottom end of the clamping assembly. The positioning disc (141) is divided into an upper cover plate (8), a lower cover plate (3) and a side frame, the straight tracks (143) being arranged through the upper cover plate and the lower cover plate; the positioning shaft (23) passes through the straight track of the upper cover plate, the involute tooth profile track (71) and the straight track of the lower cover plate in sequence from top to bottom and is limited by a limiting piece (231).

8. The closed loop controlled taping device of claim 6, wherein, The outer diameter of the driving gear (6) is smaller than the outer diameter of the driven gear (7).

9. A closed loop controlled taping device according to any of claims 2-7, characterized in that, The clamping assembly comprises: A positioning frame (10) comprising a top plate, a bottom plate and side plates connected to the side walls of the top plate and the bottom plate, respectively, the top plate, the bottom plate and the side plates being arranged in a frame structure with an open side; A telescopic member, the top end of the telescopic member being a fixed end and positioned on the bottom wall of the top plate, and the bottom end of the telescopic member being a telescopic end and forming a film positioning gap with the top wall of the bottom plate.

10. A closed loop controlled taping device according to claim 9, wherein, The telescopic member is a gas pump cylinder (11), the telescopic end of the gas pump cylinder (11) is provided with a pressure sensor for detecting the pressure of the film, and the gas inlet end of the gas pump cylinder (11) is provided with a pressure regulating valve. The parameter setting panel is configured to set the target pressure parameter of the film. The control module is configured to dynamically adjust the output of the pressure regulating valve based on the deviation between the target tension parameter and the detected pressure signal, so as to realize closed-loop control of the film pressure.

11. The closed loop controlled taping device of claim 9, wherein, The top plate of the positioning frame (10) is vertically provided with a friction felt piece (13) at the bottom wall, the bottom end of the friction felt piece (13) being a free end, when the telescopic end of the telescopic member clamps the film, the bottom end of the friction felt piece (13) abuts against the film to provide uniform friction. And / or, the top end of the bottom plate is provided with a non-slip pad (101), and the telescopic end of the telescopic member is provided with a flexible pad (111), the flexible pad (111) is arranged in correspondence with the non-slip pad (101) up and down.

12. A spin coating system characterized by, Comprise: The closed-loop controlled film stretching device according to any one of claims 1-11; A spin coating device for coating a coating on the film after the film stretching device stretches the film.

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