Film tensioning system and tensioning method

Abstract

The present invention relates to a film stretching system and a tensioning method, wherein the film stretching system includes a first tensioning mechanism, a prestressed stress detection mechanism and a second tensioning mechanism, the first tensioning mechanism includes a first fixing component and a first stretching component, the prestressed stress detection mechanism is signal-connected to the first stretching component, the second tensioning mechanism has a second stretching component with the same structure as the first stretching component, and the second stretching component is signal-connected to the prestressed stress detection mechanism; the film stretching system of the present application stretches the film material through the first tensioning mechanism, and detects the prestress of the stretched film material through the prestressed stress detection mechanism, the detected prestress can be compared with the set prestress, so as to obtain the stretching parameters of the first stretching component when the detected prestress is consistent with the set prestress, so that the second stretching component can subsequently stretch the film material according to the stretching parameters, thereby realizing precise regulation of the tensioning prestress of the film material.

Description

Technical Field

[0001] The present invention relates to the technical field of material processing, in particular to a film stretching system and a stretching method. Background Art

[0002] The membrane stretching equipment is used to apply prestress to the membrane material, so that the prestressed membrane material can cope with the load it needs to bear by producing a certain deformation.

[0003] Existing film-stretching equipment, applicable to film processing lines in the headphone industry, consists of multiple tensioning devices. These devices are positioned between the unloading and receiving devices of the processing line to tension the film. When film is present between the unloading and receiving devices, the tensioning devices apply a certain amount of prestress to the film, causing it to deform and thus completing the tensioning operation.

[0004] However, when tensioning the membrane, the tensioning device can only roughly determine the prestress of the membrane material by the stretching condition, and cannot directly feedback the exact value of the prestress of the membrane material after stretching. If the tensioning device is to initially apply the specified prestress to the membrane material and stretch it to the specified state, a large amount of raw data must be accumulated in advance. Moreover, since the initial state of the membrane material after each assembly is different, even if the raw data is accumulated, there is no guarantee that the tensioning device will accurately stretch the membrane material to the specified state every time it is operated. Summary of the Invention

[0005] Based on this, it is necessary to provide a film stretching system and a stretching method to address the above-mentioned problem of the inconvenience of accurately stretching the membrane material to a specified state.

[0006] A film drawing system, comprising:

[0007] a first tensioning mechanism, the first tensioning mechanism comprising a first fixing component and a first stretching component, the first fixing component being used to fix the film material, the first fixing component having a fixed space, the first stretching component being disposed in the fixed space and being used to stretch the film material in the fixed space;

[0008] a prestress detection mechanism, the prestress detection mechanism being connected to the first stretching assembly signal and configured to detect the prestress of the membrane material in the fixed space to obtain a stretching parameter of the first stretching assembly;

[0009] The second tensioning mechanism is arranged in a straight line on one side of the first tensioning mechanism so that the membrane material can pass through the second tensioning mechanism and the first tensioning mechanism in sequence. The second tensioning mechanism has a second tensioning component with the same structure as the first tensioning component. The second tensioning component is connected to the prestressed stress detection mechanism signal to receive the tensioning parameters of the first tensioning component.

[0010] The above-mentioned film stretching system stretches the first part of the film material through the first stretching mechanism, and detects the prestress of the film material after stretching through the prestress detection mechanism. The detected prestress can be compared with the set prestress, so as to obtain the stretching parameters of the first stretching component when the detected prestress is consistent with the set prestress, so that the second stretching component can subsequently stretch the remaining part of the film material according to the stretching parameters, thereby realizing precise control of the tensioning prestress of the film material, so as to accurately stretch the film material to a specified state.

[0011] In one embodiment, the first fixing assembly includes a first support member and a first fixing member, the first fixing member is spaced apart from the first support member by a first lifting assembly, the first lifting assembly is used to drive the first fixing member to move axially along the fixing space to approach or move away from the first support member, a first fixing channel is provided in the first support member, a first fixing opening is provided in the first fixing member, and the fixing space is formed by the inner circumference of the first fixing channel and the inner circumference of the first fixing opening.

[0012] In the above embodiment, the first lifting assembly can drive the first fixing member to move in a direction close to the first supporting member, so that the first fixing member and the first supporting member respectively abut against the front and back sides of the membrane material, thereby completing the clamping and fixing of the membrane material.

[0013] In one embodiment, the prestressed stress detection mechanism includes:

[0014] A detection component, the detection component is arranged on the first stretching component, and a pressure groove is provided on the detection component. When the film material abuts against the detection component, the film material cooperates with the inner circumference of the pressure groove to form a pressure chamber;

[0015] an air pressure control component, the air pressure control component being in communication with the pressure tank and being used to regulate the pressure in the pressure chamber;

[0016] a displacement measuring component, the displacement measuring component being spaced apart from the detection component and being used to measure the deformation of the film material on the detection component;

[0017] A data processor is connected to the air pressure control component and the displacement measurement component for calculating the prestress of the membrane material according to the pressure value in the pressure chamber and the deformation of the membrane material.

[0018] In the above embodiment, the pressure value in the pressure chamber can be regulated by the air pressure control component, so that the membrane material can be deformed under the pressure change. At the same time, the deformation of the membrane material is measured by the displacement measurement component, so that the data processor can bring the measured pressure value and deformation into the corresponding mechanical formula to calculate the accurate prestress of the membrane material.

[0019] In one embodiment, the detection assembly includes a detection platform and a pressure piece, the pressure groove is arranged on the first side of the detection platform, and the pressure piece is spaced apart from the first side of the detection platform by a second lifting assembly. The second lifting assembly is used to drive the pressure piece to move axially along the fixed space to approach or move away from the detection platform, and the pressure piece is provided with an observation port coaxial with the pressure groove.

[0020] In the above embodiment, the second lifting assembly can drive the pressing piece to move in the direction close to the first side surface of the detection platform, so that the pressing piece and the first side surface of the detection platform are respectively in contact with the front and back sides of the membrane material, further ensuring the stability of the membrane material on the detection assembly, and then ensuring the sealing of the pressure chamber formed by the membrane material and the pressure groove.

[0021] In one embodiment, the first stretching assembly includes a first displacement platform and a top membrane component, and the first displacement platform is transmission-connected to the top membrane component to drive the top membrane component to move axially along the fixed space.

[0022] In the above embodiment, the top film member can be driven to move longitudinally by the first displacement platform, so that the top film member can complete the stretching of the film material located in the fixed space.

[0023] In one embodiment, a receiving groove is provided on the first side surface of the top membrane member, and the detection platform is arranged in the receiving groove through a second displacement platform.

[0024] In the above embodiment, the detection platform can be set in the top film part to improve the structural tightness between the detection platform and the first stretching component. At the same time, by making the first side surface of the detection platform and the first side surface of the top film part located on the same plane, it is ensured that the detection platform can abut against the stretched film material so that the film material and the pressure groove cooperate to form a pressure chamber.

[0025] In one embodiment, the film stretching system also includes two first fixing units and two second fixing units, the first tensioning mechanism is arranged between the two first fixing units, and the second fixing unit is spaced apart from the first fixing unit by a third lifting component, and the third lifting component is used to drive the second fixing unit to move axially along the fixed space to approach or move away from the first fixing unit.

[0026] In the above embodiment, the third lifting assembly can drive the second fixing unit to move in the direction close to the first side surface of the first fixing unit, so that the second fixing unit and the first fixing unit can respectively abut against the front and back sides of the film material, assisting the first fixing assembly to fix the film material, and further ensuring the stability of the film material during the stretching process.

[0027] A stretching method, applied to the above-mentioned film stretching system, comprises the following steps:

[0028] 1) driving the first fixing assembly to fix the first portion of the film material so that the first portion of the film material is located in the fixed space;

[0029] 2) driving the first stretching assembly to stretch the first portion of the film;

[0030] 3) Detect the prestress of the stretched membrane material through the prestress detection mechanism;

[0031] 4) Compare the prestress obtained by the test with the set prestress;

[0032] 5) When the detected prestress is consistent with the set prestress, the second stretching assembly is driven to stretch the second portion of the membrane material using the stretching parameters of the first stretching assembly.

[0033] The above-mentioned tensioning method stretches the first part of the membrane material fixed by the first fixing component through the first stretching component, and detects the prestress of the membrane material after stretching through the prestress detection mechanism. The detected prestress can be compared with the set prestress to obtain the stretching parameters of the first stretching component when the detected prestress is consistent with the set prestress, so that the second stretching component can subsequently stretch the second part of the membrane material according to the stretching parameters, thereby realizing precise control of the tensioning prestress of the membrane material.

[0034] In one embodiment, the step 2) specifically includes the following steps:

[0035] The first displacement platform is driven to drive the top film component to move along the axial direction of the fixed space, so that after the top film component abuts against the first part of the film material, the first part of the film material gradually moves away from the fixed space.

[0036] In the above embodiment, the stretching of the first portion of the film material can be completed through the cooperation between the first displacement platform and the top film member.

[0037] In one embodiment, the step 3) specifically includes the following steps:

[0038] Driving the first stretching assembly to drive the detection assembly to move axially along the fixed space, so that the first portion of the film material cooperates with the inner circumferential surface of the pressure groove to form a pressure chamber;

[0039] Driving the air pressure control component to adjust the pressure value of the pressure chamber;

[0040] driving the displacement measuring component to measure the deformation of the first part of the membrane material;

[0041] The data processor is driven to bring the pressure value in the pressure chamber and the deformation of the first part of the membrane material into the corresponding mechanical formula to calculate the prestress of the membrane material.

[0042] In the above embodiment, the pressure value of the pressure chamber is regulated by the air pressure control component, and the membrane material is deformed under the action of pressure. At the same time, the deformation of the membrane material is measured by the displacement measurement component, so that the data processor can bring the pressure value in the pressure chamber and the deformation of the membrane material into the corresponding mechanical formula, and then calculate the prestress of the membrane material. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 This is a schematic structural diagram of a film-drawing system according to some embodiments of the present application;

[0044] Figure 2 for Figure 1 A schematic diagram of the structure of the film stretching system after the first stretching mechanism and detection component cooperate with the film material;

[0045] Figure 3 for Figure 2 Schematic diagram of the structure after the first tensioning mechanism and detection component are combined with the membrane material;

[0046] Figure 4 for Figure 1 A schematic structural diagram of the first fixing component of the film-drawing system;

[0047] Figure 5 for Figure 1 A schematic structural diagram of the first stretching component of the film stretching system;

[0048] Figure 6 for Figure 1 Schematic diagram of the structure of the detection component of the film pulling system.

[0049] Reference numerals:

[0050] 1. The first tensioning mechanism;

[0051] 11. First fixing assembly;

[0052] 111, first support member; 112, first fixing member; 113, second sealing ring;

[0053] 114. First fixed channel;

[0054] 115. First fixed port;

[0055] 12. First stretching assembly;

[0056] 121. First translation stage;

[0057] 122. Top membrane;

[0058] 124, receiving tank;

[0059] 125. Second translation stage;

[0060] 13. Fixed space;

[0061] 2. Prestressed steel testing mechanism;

[0062] 21. Detection components;

[0063] 211. Testing platform; 212. Pressing element; 213. First sealing ring;

[0064] 214. Pressure tank;

[0065] 215. Observation port;

[0066] 22. Air pressure control assembly;

[0067] 221. Detector; 222. Airflow stabilizer; 223. Flow controller; 224. Gas conveyor;

[0068] 225, tee pipe fittings;

[0069] 23. Displacement measurement component;

[0070] 24. Data processor;

[0071] 3. Second tensioning mechanism;

[0072] 31. Second fixing assembly; 32. Second stretching assembly;

[0073] 4. First fixing unit;

[0074] 5. Second fixing unit;

[0075] 6. Membrane material. DETAILED DESCRIPTION

[0076] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0077] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0078] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0079] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0080] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0081] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0082] See Figure 1 An embodiment of the present invention provides a film stretching system, including a first tensioning mechanism 1, a prestressed stress detection mechanism 2 and a second tensioning mechanism 3.

[0083] The first tensioning mechanism 1 is used to stretch the first portion of the film material 6. Figure 2 、 Figure 3 The first tensioning mechanism 1 includes a first fixing component 11 and a first stretching component 12 . The first fixing component 11 is used to fix the membrane material 6 , and the first stretching component 12 is used to stretch the membrane material 6 .

[0084] The prestress detection mechanism 2 is used to detect the prestress of the first part of the stretched membrane material 6 and compare the detected prestress with the set prestress (the set prestress is the prestress required to be applied when the membrane material 6 is stretched to a specified state).

[0085] See Figure 1 The second tensioning mechanism 3 has a second tensioning component 32 having the same structure as the first tensioning component 12 , and the second tensioning component 32 is signal-connected to the prestressed stress detection mechanism 2 .

[0086] When the detected prestress is compared to the set prestress, the test stops and the stretching parameters of the first stretching assembly 12 are obtained. The second stretching assembly 32 can then stretch the remaining portion of the membrane 6 according to these stretching parameters. When stretching the remaining portion of the membrane 6, the second stretching assembly 32 can directly follow the stretching parameters of the first stretching assembly 12 to ensure the stretching effect on the membrane. The second stretching assembly 32 no longer needs to test when the required prestress of the membrane is reached, thereby improving stretching efficiency.

[0087] See Figure 2 The first fixing assembly 11 has a fixing space 13, which is coaxial with the first fixing assembly 11. The first stretching assembly 12 is disposed within the fixing space 13 and is coaxial with the first fixing assembly 11. After the first fixing assembly 11 secures the membrane 6, a portion of the membrane 6 is located within the fixing space 13. The first stretching assembly 12 can impart a certain amount of prestress to the membrane 6 within the fixing space 13, causing the membrane 6 to deform and complete the tensioning operation.

[0088] The prestress detection mechanism 2 is mounted on the first tensioning mechanism 1 and is used to detect the prestress of the membrane material 6 within the fixed space 13 and compare the detected prestress with the set prestress. The prestress detection mechanism 2 is connected to the first tensioning assembly 12 via a signal connection. When the detected prestress matches the set prestress, it can be determined that the prestress applied by the first tensioning mechanism 1 is the prestress required to tension the membrane material 6 to the specified state.

[0089] See Figure 1 , the second tensioning mechanism 3 is arranged in a straight line on one side of the first tensioning mechanism 1, so that the membrane material 6 can pass through the second tensioning mechanism 3 and the first tensioning mechanism 1 in sequence. The prestress detection mechanism 2 can transmit the data information of the first tensioning mechanism 1 to the second tensioning mechanism 3, so that the second stretching component 32 can stretch the membrane material 6 according to the data information of the first tensioning mechanism 1, so that the second tensioning mechanism 3 can apply the prestress when the membrane material 6 is stretched to a specified state. It is worth mentioning that the prestress detection mechanism 2 is only provided in the first tensioning mechanism 1. The prestress detection mechanism 2 is not provided on the second tensioning mechanism 3, nor is it required for the prestress detection mechanism 2 to detect the membrane material 6 on the second tensioning mechanism 3. The second tensioning mechanism 3 only receives the information transmitted by the prestress detection mechanism 2.

[0090] Specifically, the second tensioning mechanism 3 has the same structure as the first tensioning mechanism 1, including a second fixing assembly 31 and a second stretching assembly 32. The second fixing assembly 31 is used to fix the membrane material 6, and the second stretching assembly 32 is used to stretch the membrane material 6. This consistent structure allows the second tensioning mechanism 3 to more accurately stretch the membrane material 6 to a specified state based on the data information of the first tensioning mechanism 1.

[0091] Furthermore, multiple second tensioning mechanisms 3 can be provided, each of which is located on the film processing line. Multiple second tensioning mechanisms 3 can be used to perform stretching operations on different portions of the film on the processing line. When the above-described film stretching system is applied to a film processing line, the second tensioning mechanism 3 and the first tensioning mechanism 1 are both located between the unloading and receiving devices of the processing line, with the second tensioning mechanism 3 located closer to the unloading device and the first tensioning mechanism 1 located closer to the receiving device. After the film is secured between the unloading and receiving devices, the first tensioning mechanism 1 first stretches the first portion of the film 6. The prestress of the stretched film 6 is then measured by the prestress detection mechanism 2. The measured prestress is then compared with the set prestress to determine the data from the first tensioning assembly 12 when the measured prestress matches the set prestress. The second tensioning assembly 32 then stretches the remaining portions of the film 6 based on this data. After each stretching operation, the film 6 moves closer to the receiving device until all of the film 6 is stretched. Through the cooperation between the second tensioning mechanism 3, the prestress detection mechanism 2 and the first tensioning mechanism 1, the second tensioning mechanism 3 can realize the precise regulation of the tensioning prestress of the membrane material 6, and thus accurately tension the membrane material to a specified state.

[0092] It is worth mentioning that the first portion of the film material 6 and the remaining portion of the film material 6 refer to different areas of the film material 6 rather than designated portions on the film material 6 .

[0093] See Figure 1 In one embodiment, the prestressed pressure detection mechanism 2 includes a detection component 21 and an air pressure control component 22. The air pressure control component 22 is connected to the detection component 21 and is used to regulate the pressure in the pressure chamber.

[0094] See Figure 2 and Figure 3 The detection component 21 is arranged on the first stretching component 12. A pressure groove 214 is provided on the detection component 21. When the film material 6 abuts against the detection component 21, the film material 6 cooperates with the inner circumference of the pressure groove 214 to form a pressure chamber.

[0095] Specifically, the detection assembly 21 is disposed within the first stretching assembly 12. The pressure groove 214 opens on the top surface of the detection assembly 21 and extends a certain distance into the interior of the detection assembly 21. When the first stretching assembly 12 drives the detection assembly 21 toward the film 6 and the top surface of the detection assembly 21 abuts the bottom surface of the film 6, the bottom surface of the film 6 cooperates with the inner circumference of the pressure groove 214 to form a pressure chamber.

[0096] See Figure 1The air pressure control component 22 includes a detector 221, an airflow stabilizer 222, a flow controller 223 and a gas conveyor 224. The detector 221 is connected to the detection component 21 and is used to detect the pressure in the pressure chamber. The gas conveyor 224 is connected to the detection component 21 and is used to convey gas into the detection component 21 to increase the pressure in the pressure chamber. The flow controller 223 is connected and arranged between the gas conveyor 224 and the detection component 21, and is used to control the flow rate and flow of the gas conveyed by the gas conveyor 224 to the detection component 21, thereby flexibly adjusting the pressure value in the pressure chamber. The airflow stabilizer 222 is connected and arranged between the flow controller 223 and the detection component 21, and is used to stabilize the airflow entering the detection component 21.

[0097] It will be appreciated that, in the present application, the gas delivery device 224 may be a gas cylinder equipped with a pressure reducing valve. The detector 221 may be a multi-channel, switchable differential pressure gauge. The differential pressure gauge reading can be used to determine whether the pressure chamber has reached a dynamic equilibrium between intake and leakage. Specifically, when the flow controller 223 is set to a fixed flow rate, the leakage rate of the detection system is also constant at that flow rate. Therefore, when the differential pressure gauge reading remains constant, it can be considered that the intake and leakage of the detection system have reached a dynamic equilibrium, and the pressure differential is constant.

[0098] In addition, the differential pressure gauge, the airflow stabilizer 222 and the detection assembly 21 are connected through a three-way pipe fitting 225 to ensure the compactness of the overall structure.

[0099] In addition, the prestressed stress detection mechanism 2 further includes a displacement measurement component 23 , which is spaced apart from the detection component 21 and is used to measure the deformation of the film material 6 on the detection component 21 .

[0100] Specifically, the displacement measurement assembly 23 is disposed above the detection assembly 21. When the film 6 is secured to the first tensioning mechanism 1, the orthographic projection of the displacement measurement assembly 23 on the detection assembly 21 is located in the center of the film 6, enabling the displacement measurement assembly 23 to accurately measure the displacement of the center of the film 6. It will be appreciated that, in the present application, the displacement measurement assembly 23 may be a laser rangefinder or other measurement assembly capable of sensing changes in the displacement of the film.

[0101] The data processor 24 is connected to the air pressure control component 22 and the displacement measurement component 23 for signal communication, and is used to calculate the prestress of the membrane material 6 according to the pressure value in the pressure chamber and the deformation of the membrane material 6.

[0102] In the aforementioned prestress detection mechanism 2, after the membrane material 6 and pressure groove 214 cooperate to form a pressure chamber, the gas conveyor 224 injects gas into the pressure chamber, causing the membrane material 6 to deform under pressure changes. Simultaneously, the airflow stabilizer 222 stabilizes the airflow entering the pressure chamber, and the flow controller 223 regulates the flow rate and volume of the input gas to achieve a dynamic balance between air intake and air leakage. The pressure in the pressure chamber and the deformation of the membrane material 6 are then measured using a differential pressure gauge and a displacement measurement assembly 23, respectively. The data processor 24 calculates the prestress of the membrane material 6 based on the corresponding mechanical formulas.

[0103] See Figure 2 In one embodiment, the detection assembly 21 includes a detection platform 211 and a pressing piece 212, the pressure groove 214 is set on the top surface of the detection platform 211, the pressing piece 212 is spaced apart from the first side surface of the detection platform 211, and the pressing piece 212 can move axially along the fixed space 13 to approach or move away from the detection platform 211.

[0104] in,

[0105] A second lifting assembly (not shown) may be provided on the pressing member 212. The second lifting assembly drives the pressing member 212 to move axially, allowing the pressing member 212 to cooperate with the testing platform 211 to secure the membrane 6. Specifically, when the second lifting assembly drives the pressing member 212 to move in a direction approaching the first side surface of the testing platform 211, the pressing member 212 and the first side surface of the testing platform 211 can respectively abut against the front and back surfaces of the membrane 6, further ensuring the stability of the membrane 6 on the testing assembly 21, and thereby ensuring the sealing of the pressure chamber formed by the membrane 6 and the testing assembly 21.

[0106] It can be understood that in the present application, the axial sides of the second lifting component can be connected to the mounting frame and the pressing piece 212 of the equipment respectively, and the second lifting component can use an electric push rod or other moving components that can drive objects to lift.

[0107] In addition, the pressing member 212 is provided with an observation port 215 coaxial with the pressure groove 214 , and the displacement measuring component 23 can detect the deformation of the membrane material 6 through the observation port 215 .

[0108] See Figure 2 and Figure 6 A first sealing ring 213 is provided on the top surface of the testing platform 211. A pressure member 212 is located above the testing platform 211, and the orthographic projection of the pressure member 212 on the testing platform 211 covers the first sealing ring 213. When the film 6 is fixed between the testing platform 211 and the pressure member 212, the top surface of the first sealing ring 213 abuts the bottom surface of the film 6, and the bottom surface of the pressure member 212 abuts the top surface of the film 6.

[0109] The pressure groove 214 opens onto the top surface of the testing platform 211 and extends a certain distance into the interior of the testing platform 211. The inner contours of the cross-sections of the pressure groove 214 and the observation port 215 are both circular, while the outer contours of the cross-sections of the testing platform 211 and the pressure member 212 are both circular. The diameter of the inner contour of the cross-section of the pressure groove 214 is consistent with the inner diameter of the first sealing ring 213, while the diameter of the outer contour of the cross-section of the testing platform 211 is consistent with the outer diameter of the first sealing ring 213. This ensures that the first sealing ring 213 occupies the largest area on the top surface of the testing platform 211, thereby maximizing the sealing effect on the membrane 6. The inner contour of the cross-section of the observation port 215 is consistent with the inner diameter of the first sealing ring 213, while the diameter of the outer contour of the cross-section of the pressure member 212 is consistent with the outer diameter of the first sealing ring 213. By making the pressure member 212 have an appearance consistent with the first sealing ring 213, the pressure member 212 and the first sealing ring 213 are effectively matched.

[0110] See Figure 3 and Figure 4 In one embodiment, the first fixing assembly 11 includes a first support member 111 and a first fixing member 112. The first fixing member 112 is spaced apart from the first support member 111. The first fixing member 112 can move axially along the fixing space 13 to approach or move away from the first support member 111.

[0111] The first fixing member 112 can be connected to a first lifting assembly (not shown in the figure), and the first lifting assembly drives the first fixing member 112 to move axially, so that the first fixing member 112 can cooperate with the first support member 111 to fix the film material 6. It can be understood that in this application, the axial sides of the first lifting assembly can be connected to the mounting frame of the equipment and the first fixing member 112 respectively, and an electric push rod or other moving assembly that can drive an object to be raised or lowered can be selected.

[0112] Specifically, when in use, the first lifting assembly can drive the first fixing member 112 to move in a direction close to the first supporting member 111, so that the first fixing member 112 and the first supporting member 111 respectively abut against the front and back sides of the film material 6, thereby completing the clamping and fixing of the film material 6.

[0113] A first fixing channel 114 is defined in the first support member 111 , a first fixing opening 115 is defined in the first fixing member 112 , and the fixing space 13 is formed by the inner circumference of the first fixing channel 114 and the inner circumference of the first fixing opening 115 .

[0114] A second sealing ring 113 is provided on the top surface of the first support member 111. The first fixing member 112 is located above the first support member 111, and the orthographic projection of the first fixing member 112 on the first support member 111 covers the second sealing ring 113. When the film 6 is fixed between the first support member 111 and the first fixing member 112, the top surface of the second sealing ring 113 abuts against the bottom surface of the film 6, and the bottom surface of the first fixing member 112 abuts against the top surface of the film 6.

[0115] A first fixing channel 114 is provided within the first support member 111, and a first fixing opening 115 is provided within the first fixing member 112, coaxial with the first fixing channel 114. The inner contours of the cross-sections of the first fixing channel 114 and the first fixing opening 115 are both circular, and the outer contours of the cross-sections of the first support member 111 and the first fixing member 112 are both circular. The diameter of the inner contour of the cross-section of the first fixing channel 114 is consistent with the inner diameter of the second sealing ring 113, and the diameter of the outer contour of the cross-section of the first support member 111 is consistent with the outer diameter of the second sealing ring 113, ensuring that the second sealing ring 113 can occupy the largest area on the top surface of the first support member 111 to maximize the sealing effect on the membrane 6. The inner contour of the cross-section of the first fixing opening 115 is consistent with the inner diameter of the second sealing ring 113, and the outer contour of the cross-section of the first fixing member 112 is consistent with the outer diameter of the second sealing ring 113. By making the first fixing member 112 have a cross-sectional shape consistent with the first sealing ring 213 , it is ensured that the first fixing member 112 can achieve a matching effect with the second sealing ring 113 with a minimum cross-sectional structure.

[0116] See Figure 2 and Figure 5 In one embodiment, the first stretching assembly 12 includes a first displacement platform 121 and a top film member 122. The first displacement platform 121 is transmission-connected to the top film member 122. The first displacement platform 121 is used to drive the top film member 122 to move axially along the fixed space 13 so that the top film member 122 completes the stretching of the film material 6 located in the fixed space 13.

[0117] Specifically, the first translation stage 121 is disposed within the first fixed channel 114 and is coaxial with the first fixed channel 114. The top surface of the first translation stage 121 is connected to the bottom surface of the top membrane 122. The top membrane 122 is located within the first fixed channel 114 and is coaxial with the first fixed channel 114.

[0118] In addition, it can be understood that in the present application, the first translation platform 121 can be an electric push rod or other moving components that can drive objects to move up and down.

[0119] See Figure 2In one embodiment, a receiving groove 124 is provided on the first side surface of the top film member 122, and the testing platform 211 is positioned within the receiving groove 124 via a second translation platform 125. By positioning the testing platform 211 within the top film member 122, the structural tightness between the testing platform 211 and the first stretching assembly 12 is improved. The second translation platform 125 can drive the testing platform 211 to move, allowing the testing platform 211 to abut against the film material 6 after being stretched by the top film member 122, so that the film material 6 cooperates with the pressure groove 214 to form a pressure chamber.

[0120] Specifically, the receiving groove 124 opens on the top surface of the top film member 122 and extends a certain distance toward the inside of the top film member 122. The detection platform 211 is arranged in the receiving groove 124 and is coaxial with the first fixed channel 114. A second displacement platform 125 is provided between the top film member 122 and the detection component 21. It can be understood that in the present application, the second displacement platform 125 can be selected from electric push rods or other moving components that can drive objects to be lifted and lowered. The axial ends of the second displacement platform 125 are respectively connected to the bottom surfaces of the receiving groove 124 and the detection component 21, and are used to drive the detection component 21 to be longitudinally lifted and lowered relative to the receiving groove 124.

[0121] See Figure 1 In one embodiment, the film stretching system further includes two first fixing units 4 and two second fixing units 5. The first tensioning mechanism 1 is disposed between the two first fixing units 4. The second fixing units 5 are spaced apart from the first fixing units 4 by a third lifting assembly. The third lifting assembly is used to drive the second fixing units 5 to move axially along the fixing space 13 to move closer to or away from the first fixing units 4. The third lifting assembly can drive the second fixing units 5 to move in a direction approaching the first side surface of the first fixing unit 4, so that the second fixing units 5 and the first fixing units 4 can respectively abut against the front and back surfaces of the film material 6, assisting the first fixing assembly 11 in fixing the film material 6 and further ensuring the stability of the film material 6 during the stretching process.

[0122] Specifically, the cross-sectional profiles of the first fixing unit 4 and the second fixing unit 5 are both rectangular, and the length of the rectangular profile is greater than the width of the film material 6, so that there is a larger abutment area between the first fixing unit 4 and the second fixing unit 5 and the film material 6, thereby ensuring the fixing effect of the first fixing unit 4 and the second fixing unit 5 on the film material 6.

[0123] In addition, it can be understood that in the present application, the third lifting component can be an electric push rod or other moving components that can drive objects to be lifted or lowered.

[0124] The embodiment of the present application further provides a stretching method, which is applied to the above-mentioned film stretching system and includes the following steps:

[0125] 1) Drive the first fixing assembly 11 to fix the film material 6 so that part of the film material 6 is located in the fixing space 13 .

[0126] Specifically, the first lifting assembly is controlled to drive the first fixing member 112 to move longitudinally in the direction close to the first support member 111 until the bottom surface of the first fixing member 112 and the top surface of the second sealing ring 113 respectively abut against the top surface and bottom surface of the membrane material 6, thereby completing the clamping and fixation of the membrane material 6.

[0127] In addition, before driving the first fixing component 11 to fix the film material 6, first control the third lifting component to drive the second fixing unit 5 to move longitudinally in the direction close to the first fixing unit 4 until the bottom surface of the second fixing unit 5 and the top surface of the first fixing unit 4 respectively abut against the top surface and bottom surface of the film material 6, completing the preliminary fixation of the film material 6.

[0128] 2) Driving the first stretching assembly 12 to stretch the film material 6 in the fixed space 13 .

[0129] Specifically, the first translation stage 121 is controlled to drive the top film member 122 to move longitudinally in a direction away from the first support member 111, so that the top surface of the top film member 122 can abut against the bottom surface of the film material 6. The first translation stage 121 then continues to drive the top film member 122 to move longitudinally in a direction away from the first support member 111, thereby deforming the film material 6 in the fixed space 13 and completing the stretching of the film material 6.

[0130] 3) The prestress of the stretched membrane material 6 is detected by the prestress detection mechanism 2 .

[0131] Specifically, the air pressure control assembly 22 is driven to regulate the pressure in the pressure chamber, causing the membrane 6 to deform under the action of the air pressure. During this deformation process, the displacement measurement assembly 23 is driven to measure the deformation of the membrane 6, obtaining the central deflection value of the membrane 6. The data processor 24 is driven to substitute the pressure in the pressure chamber and the central deflection value of the membrane 6 into the corresponding mechanical formula to calculate the prestress of the membrane 6.

[0132] More specifically, the corresponding mechanical formula is:

[0133] Wherein, E is Young's elastic modulus, v is Poisson's ratio, r is the radius of the membrane material 6, t is the thickness of the membrane material 6, σ0 is the prestress, q is the pressure value of the pressure chamber, and ω is the central deflection value of the membrane material 6.

[0134] 4) Compare the prestress obtained by testing with the set prestress.

[0135] Specifically, the set prestress is the prestress σ1 that needs to be applied when the membrane material 6 is stretched to a specified state, and the detected prestress is σ2. The data processor 24 compares σ2 with σ1.

[0136] 5) When the detected prestress is consistent with the set prestress, the second stretching assembly 32 is driven to stretch the film material 6 with reference to the stretching parameters of the first stretching assembly 12 .

[0137] Specifically, if σ2 is equal to σ1, the data processor 24 transmits the movement distance information of the top film member 122 of the first stretching assembly 12 to the second stretching assembly 32, so that the second stretching assembly 32 controls its second first translation stage to move the same distance, so that the second stretching assembly 32 can stretch the film material 6 to a specified state.

[0138] In addition, if the detected prestress is inconsistent with the set prestress, the prestress detection mechanism 2 stops detecting the membrane material 6, and then steps 2) to 4) are repeated.

[0139] Specifically, if σ2 is less than σ1, the prestress detection mechanism 2 is first stopped from detecting the membrane material 6, and then the first displacement platform 121 is controlled to continue to drive the top membrane member 122 to move longitudinally in a direction away from the first support member 111, so that the deformation of the membrane material 6 increases, and then the prestress detection mechanism 2 is driven again to detect the prestress of the membrane material 6.

[0140] If σ2 is greater than σ1, the prestress detection mechanism 2 is stopped from detecting the membrane material 6, and then the first displacement platform 121 is controlled to continue to drive the top membrane member 122 to move longitudinally in the direction close to the first support member 111, so that the deformation of the membrane material 6 is reduced, and then the prestress detection mechanism 2 is driven again to detect the prestress of the membrane material 6.

[0141] In the above-mentioned tensioning method, the membrane material 6 fixed by the first fixing component 11 is stretched by the first stretching component 12, and the prestress of the membrane material 6 after stretching is detected by the prestress detection mechanism 2. The detected prestress can be compared with the set prestress so as to obtain the stretching parameters of the first stretching component 12 when the detected prestress is consistent with the set prestress, so that the second stretching component 32 can subsequently stretch the membrane material 6 according to the stretching parameters, thereby realizing precise control of the tensioning prestress of the membrane material 6.

[0142] In one embodiment, step 3) specifically includes the following steps:

[0143] The first stretching assembly 12 is driven to drive the detection assembly 21 to move axially along the fixed space 13 , so that the film material 6 cooperates with the inner circumference of the detection assembly 21 to form a pressure chamber.

[0144] Specifically, the second displacement platform 125 is controlled to drive the detection platform 211 to move longitudinally in the direction close to the film material 6, and the top surface of the detection platform 211 is in contact with the bottom surface of the film material 6. At this time, the bottom surface of the film material 6 can cooperate with the inner circumference of the pressure groove 214 to form a pressure chamber.

[0145] The driving air pressure control component 22 adjusts the pressure value of the pressure chamber.

[0146] Specifically, the gas conveyor 224 is driven to convey gas into the detection component 21, and the flow controller 223 is driven to control the flow rate and flow rate of the gas conveyed by the gas conveyor 224 into the detection component 21, so as to flexibly adjust the pressure in the pressure chamber, and at the same time, the pressure value in the pressure chamber is measured by the differential pressure gauge.

[0147] Drive the displacement measuring component 23 to measure the deformation of the film material 6;

[0148] Specifically, the displacement measuring component 23 is driven to accurately measure the displacement of the central area of ​​the film material 6 to obtain the central deflection value of the film material 6 .

[0149] The driving data processor 24 brings the pressure value in the pressure chamber and the deformation of the membrane material 6 into the corresponding mechanical formula to calculate the prestress of the membrane material 6.

[0150] Specifically, the driving data processor 24 brings Young's elastic modulus E, Poisson's ratio v, the radius r of the membrane 6, the thickness t of the membrane 6, the pressure value q in the pressure chamber, and the central deflection value ω of the membrane 6 into the mechanical formula The prestress σ0 of membrane material 6 is calculated.

[0151] In summary, after the membrane material 6 and the pressure groove 214 cooperate to form a pressure chamber, gas is injected into the pressure chamber via the gas conveyor 224, causing the membrane material 6 to deform under pressure changes. Simultaneously, the airflow into the pressure chamber is stabilized by the airflow stabilizer 222, and the flow rate and volume of the input gas are regulated by the flow controller 223, so that the pressure chamber achieves a dynamic balance between air intake and air leakage. The pressure value within the pressure chamber and the deformation of the membrane material 6 are then measured by the differential pressure gauge and the displacement measurement assembly 23, respectively. The prestressed stress of the membrane material 6 is then calculated by the data processor 24.

[0152] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0153] The above embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A film drawing system, characterized in that: include: A first tensioning mechanism (1), the first tensioning mechanism (1) comprising a first fixing component (11) and a first stretching component (12), the first fixing component (11) being used to fix the film material (6), the first fixing component (11) having a fixed space (13), the first stretching component (12) being arranged in the fixed space (13) and being used to stretch the film material (6) in the fixed space (13); A prestress detection mechanism (2), the prestress detection mechanism (2) being connected to the first stretching assembly (12) by signal, for detecting the prestress of the membrane material (6) in the fixed space (13), comparing the detected prestress with the set prestress, and obtaining the stretching parameter of the first stretching assembly (12) when the detected prestress is consistent with the set prestress; The second tensioning mechanism (3) is arranged in a straight line on one side of the first tensioning mechanism (1) so that the membrane material (6) can pass through the second tensioning mechanism (3) and the first tensioning mechanism (1) in sequence. The second tensioning mechanism (3) has a second tensioning component (32) having the same structure as the first tensioning component (12). The second tensioning component (32) is connected to the prestressed stress detection mechanism (2) by signal so as to receive the tensioning parameters of the first tensioning component (12). The second tensioning component (32) performs a tensioning operation according to the tensioning parameters.

2. The film stretching system according to claim 1, characterized in that: The prestress detection mechanism (2) comprises: A detection component (21), the detection component (21) is arranged on the first stretching component (12), and a pressure groove (214) is provided on the detection component (21). When the film material (6) abuts against the detection component (21), the film material (6) cooperates with the inner circumference of the pressure groove (214) to form a pressure chamber; an air pressure control assembly (22), the air pressure control assembly (22) being in communication with the pressure tank (214) and being used to regulate the pressure in the pressure chamber; a displacement measuring component (23), the displacement measuring component (23) being spaced apart from the detection component (21) and being used to measure the deformation of the film material (6) on the detection component (21); A data processor (24) is connected to the air pressure control component (22) and the displacement measurement component (23) for signal communication, and is used to calculate the prestress of the membrane material (6) based on the pressure value in the pressure chamber and the deformation of the membrane material (6).

3. The film stretching system according to claim 2, characterized in that: The detection assembly (21) includes a detection platform (211) and a pressure piece (212), the pressure groove (214) is arranged on the first side of the detection platform (211), the pressure piece (212) is spaced apart from the first side of the detection platform (211), the pressure piece (212) can move along the axial direction of the fixed space (13) to approach or move away from the detection platform (211), and the pressure piece (212) is provided with an observation port (215) coaxial with the pressure groove (214).

4. The film stretching system according to claim 3, characterized in that: The first stretching assembly (12) comprises a first displacement platform (121) and a top membrane component (122). The first displacement platform (121) is transmission-connected to the top membrane component (122). The first displacement platform (121) is used to drive the top membrane component (122) to move axially along the fixed space (13).

5. The film drawing system according to claim 4, characterized in that: A receiving groove (124) is provided on the first side surface of the top membrane member (122); the detection platform (211) is arranged in the receiving groove (124) via a second displacement platform (125); and the second displacement platform (125) is used to drive the detection platform (211) to move axially along the fixed space (13).

6. The film stretching system according to claim 1, characterized in that: The first fixing assembly (11) includes a first support member (111) and a first fixing member (112). The first fixing member (112) is spaced apart from the first support member (111), and the first fixing member (112) can move axially along the fixing space (13) to approach or move away from the first support member (111). A first fixing channel (114) is provided in the first support member (111), and a first fixing opening (115) is provided in the first fixing member (112). The fixing space (13) is formed by the inner circumference of the first fixing channel (114) and the inner circumference of the first fixing opening (115).

7. The film stretching system according to claim 1, characterized in that: The film stretching system further comprises two first fixing units (4) and two second fixing units (5), wherein the first tensioning mechanism (1) is arranged between the two first fixing units (4), the second fixing unit (5) is spaced apart from the first fixing unit (4), and the second fixing unit (5) can be moved axially along the fixing space (13) to approach or move away from the first fixing unit (4).

8. A stretching method, applied to the film stretching system according to any one of claims 1 to 7, characterized in that: The following steps are involved: 1) driving the first fixing component (11) to fix the first portion of the membrane material (6) so that the first portion of the membrane material (6) is located in the fixing space (13); 2) driving the first stretching assembly (12) to stretch the first portion of the film material (6); 3) detecting the prestress of the first part of the stretched membrane material (6) by means of a prestress detection mechanism (2); 4) Compare the prestress obtained by the test with the set prestress; 5) When the detected prestress is consistent with the set prestress, the second stretching component (32) is driven to stretch the second part of the membrane material (6) using the stretching parameters of the first stretching component (12).

9. The tensioning method according to claim 8, characterized in that: The step 2) specifically includes the following steps: The first displacement platform (121) is driven to drive the top film member (122) to move axially along the fixed space (13), so that after the top film member (122) abuts against the first part of the film material (6), the first part of the film material (6) gradually moves away from the fixed space (13).

10. The tensioning method according to claim 8, characterized in that: The step 3) specifically includes the following steps: Driving the first stretching assembly (12) to drive the detection assembly (21) to move along the axial direction of the fixed space (13) until the detection assembly (21) abuts against the first portion of the film material (6), so that the first portion of the film material (6) cooperates with the inner circumferential surface of the pressure groove (214) to form a pressure chamber; A driving air pressure control component (22) adjusts the pressure value of the pressure chamber; driving the displacement measuring component (23) to measure the deformation of the first part of the membrane material (6); The driving data processor (24) brings the pressure value in the pressure chamber and the deformation of the first part of the membrane material (6) into the corresponding mechanical formula to calculate the prestress of the membrane material (6).

Images