Automobile polyester film extensibility detection device

Abstract

The invention discloses an automobile polyester film extensibility detection device, which relates to the technical field of photoelectric detection and comprises a workbench and an experiment table connected to the workbench. The driving table is arranged in the experiment table, a driving surface gradually protruding outwards is arranged on one side of the driving table, and a plurality of strip-shaped arc openings penetrating through the driving table are concentrically formed in the driving surface; the concentric strip-shaped arc opening formed in the driving table is matched with the frustum-shaped transmission part of the transmission table, so that the rotating speed of the transmission table can be flexibly adjusted, automatic adjustment of the angle of an optical instrument in the polyester film stretching process is achieved, and light deflection caused by deformation of a film material is compensated. Besides, aiming at the change of the stretching speed and the design of different rotating speeds of the transmitting end and the receiving end, the dynamic deformation of the polyester film is better adapted, the response speed and sensitivity of detection are improved, the detection efficiency is improved, and the adaptability and reliability of detection are enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of photoelectric detection, in particular to an elongation detection device for automotive polyester films. Background Art

[0002] With the rapid development of the automobile industry and the continuous improvement of consumers' requirements for vehicle performance, the performance and quality inspection of automotive polyester films as protective materials for key parts such as windows and car bodies are particularly important. Among them, elongation is an important indicator to measure the flexibility and durability of automotive polyester films. The traditional elongation test of automotive polyester films mainly relies on mechanical tensile testing machines, which stretch the sample by applying external force and measure its elongation to calculate the elongation. Although this method can reflect the elongation performance of the material to a certain extent, it may be affected by factors such as friction and irregular shape of the sample during the mechanical stretching process, resulting in a decrease in measurement accuracy. For this reason, optical equipment has gradually attracted attention in the field of material testing due to its advantages of non-contact, high precision, and real-time observation. In the process of elongation detection of polyester films, it is often necessary to test the elongation changes of polyester films at different speeds. As the stretching speed increases, the deformation rate experienced by the polyester film accelerates, and the internal stress distribution also changes accordingly. This rapid change in stress will directly affect the molecular structure and electronic arrangement of the material, thereby changing its refractive index. In order to ensure the accuracy of the collected data, it is often necessary to adjust the detection angle of the optical instrument accordingly.

[0003] During the detection process, the existing optical detection devices are usually fixed or use manual angle adjustment to adjust the detection angle. The detection parameters (such as light source wavelength, detection angle, etc.) are fixed and cannot be dynamically adjusted according to the change of stretching speed. This results in that at different stretching speeds, the device may not be able to capture the real change of the refractive index of the polyester film, and cannot respond to the impact of the stretching speed change on the refractive index of the polyester film in time, and thus cannot make corresponding adjustments to the detection angle or light source parameters. Since the impact of the stretching speed on the refractive index is ignored, the existing device often has deviations in its measurement results when detecting the elongation of the polyester film. This deviation may lead to misjudgment of the material properties, thereby affecting the quality and safety of the product.

[0004] Therefore, we designed an automotive polyester film elongation detection device to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a device for detecting the elongation of automotive polyester films to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the present invention provides an automotive polyester film elongation detection device, comprising a workbench and a test bench connected to the workbench, including:

[0007] A driving platform is arranged in the experimental platform, one side of the driving platform is provided with a driving surface which gradually protrudes outward, a plurality of strip-shaped arc openings which penetrate the driving platform are concentrically arranged on the driving surface, and the driving surface outside the strip-shaped arc openings of the same radius forms a driving part;

[0008] Two transmission platforms are symmetrically arranged on the left and right sides of the driving platform. A frustum-shaped transmission part is arranged on one side of the two transmission platforms. The two transmission parts can contact the driving parts at the same radius or different radii respectively to change the rotation speed of the two transmission platforms.

[0009] The optical receiver and the optical transmitter are respectively connected to the corresponding transmission platform through a gear assembly for synchronously adjusting the deflection angles of the optical receiver and the optical transmitter.

[0010] Furthermore, the strip arc opening comprises:

[0011] The third arc opening, the second arc opening and the first arc opening of different radii are formed gradually from the edge of the driving surface to the center of the circle. The openings of the first arc opening and the third arc opening are opposite, and the radial distance from the second arc opening is consistent.

[0012] Furthermore, the gear assembly comprises:

[0013] A first mounting shaft is connected to a side of the transmission platform away from the driving platform;

[0014] A first worm is connected to the other end of the first mounting shaft, the first worm is meshedly connected to a first worm wheel, and the first worm wheel is connected to an optical instrument mounting frame that rotates with the rotation of the first worm wheel;

[0015] Two optical instrument mounting frames are respectively connected to the light transmitter and the light receiver, and are used for transmitting detection light to the polyester film and receiving light refracted by the polyester film;

[0016] The transmission rack moves vertically upward as the polyester film is stretched, and a transmission gear is meshedly connected to the transmission rack, and the transmission gear is used to drive the driving platform to rotate.

[0017] Furthermore, the experimental platform is also provided with a first transmission assembly:

[0018] The first transmission assembly includes a connecting column rotatably arranged in the experimental table, and as the connecting column rotates, the driving table generates a horizontal deflection;

[0019] The universal joint is hemispherical, has a spherical cavity formed therein, and is rotatably connected in the connecting column. The driving platform is connected to one side of the universal joint through a short-connecting rod.

[0020] The second installation shaft is rotatably connected in the universal joint. A gantry connecting frame is rotatably connected to the second installation shaft. The other end of the gantry connecting frame is connected to the transmission gear. As the transmission gear rotates, the gantry connecting frame rotates and drives the driving platform to rotate.

[0021] Furthermore, it also includes a second transmission assembly:

[0022] The second transmission assembly includes a mounting gear, which is rotatably arranged in the experimental table and meshes with the transmission rack. A second worm is coaxially arranged on the mounting gear and rotates synchronously with the rotation of the mounting gear.

[0023] The second worm gear is connected to the connecting post to drive the connecting post to rotate, and the second worm and the second worm gear are meshed with each other.

[0024] Furthermore, the experimental platform is also provided with an anti-shake component, including:

[0025] A connecting disk connected to the experimental table, a ratchet is rotatably connected in the connecting disk, the first mounting shaft is connected to the ratchet, a pawl is rotatably connected in the connecting disk, and the pawl and the ratchet are meshed with each other;

[0026] The first electromagnetic adsorption block is connected in the connection disk, the pawl is connected with the first connection magnetic block, the position of the first connection magnetic block corresponds to the first electromagnetic adsorption block, and the first electromagnetic adsorption block is used to adsorb the first connection magnetic block so that the pawl rotates and no longer meshes with the ratchet wheel;

[0027] A compression spring has one end connected to the pawl and the other end connected to the inner wall of the connecting disk.

[0028] Furthermore, the experimental platform is also provided with a trigger component, including:

[0029] A fixed ring is connected to a bidirectional screw rod driving the polyester film to stretch, and at least two mounting frames are connected to the fixed ring, and a connecting spring is connected to the mounting frame, and the other end of the connecting spring is connected to a second connecting magnetic block, wherein as the stretching speed increases, the rotation speed of the bidirectional screw rod increases, and the centrifugal force of the fixed ring gradually increases. When the centrifugal force of the fixed ring is greater than the elastic force of the connecting spring, the second connecting magnetic block moves in a direction away from the center of the fixed ring;

[0030] The fixed disk is rotatably arranged in the experimental table. The inner wall of the fixed disk is connected with at least two second electromagnetic adsorption blocks along the circumferential direction. The second connecting magnetic block moves in the direction away from the center of the fixed ring, and finally adsorbs and fixes with the second electromagnetic adsorption block to drive the fixed disk to rotate.

[0031] Furthermore, the trigger assembly also includes a synchronous wheel rotatably connected to the experimental table, a synchronous belt is transmission-connected between the synchronous wheel and the fixed disk, a connecting gear is coaxially connected to the synchronous wheel, and rotates with the rotation of the synchronous wheel, and the connecting gear is meshed with one side of the driving platform to drive the transmission rack to move vertically upward.

[0032] Furthermore, the transmission rack includes: a second tooth groove, a third tooth groove and a first tooth groove which are opened in sequence from bottom to top, wherein the second tooth groove and the third tooth groove are on opposite sides of the transmission rack, the first tooth groove is located on the other side of the transmission rack, the second tooth groove is meshed with the connecting gear, the first tooth groove is meshed with the transmission gear, and the third tooth groove is meshed with the mounting gear.

[0033] Furthermore, a spacing groove is provided on the transmission rack, and the spacing groove and the third tooth groove are located on the same side of the transmission rack. The spacing groove is used to enable the transmission rack to rise vertically for a certain distance before the third tooth groove engages with the mounting gear to drive the driving platform to deflect horizontally.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The concentric strip arcs set on the driving platform cooperate with the frustum-shaped transmission part of the transmission platform, so that the rotation speed of the transmission platform can be flexibly adjusted, and the automatic adjustment of the angle of the optical instrument during the stretching process of the polyester film is realized to compensate for the light deflection caused by the deformation of the film material. In addition, in response to the change in stretching speed, the different rotation speeds of the transmitting end and the receiving end are designed to better adapt to the dynamic deformation of the polyester film and improve the response speed and sensitivity of the detection. This setting not only improves the detection efficiency, but also enhances the adaptability and reliability of the detection.

[0036] 2. Through the universal joint and gantry connection frame structure, the drive platform can rotate around the axis and deflect horizontally. The hemispherical spherical cavity design of the universal joint enables the drive platform to deflect flexibly in the horizontal direction, while the gantry connection frame effectively transmits the rotational power of the transmission gear to ensure that the drive platform can rotate stably around the axis. This design not only enhances the flexibility and adaptability of the detection device, but also improves the accuracy and stability of the detection process.

[0037] 3. The clever combination of ratchet, pawl and electromagnetic adsorption block effectively solves the problem of jitter caused by inertia during the angle adjustment of the optical detection instrument. The meshing mechanism of the ratchet and pawl limits the reverse rotation of the installation shaft and the connected parts, ensuring the stability and accuracy of the detection process. When the detection test is completed, the activation of the first electromagnetic adsorption block enables the pawl to quickly disengage from the ratchet, facilitating the smooth return of the optical instrument to its original position, thereby improving the detection efficiency and convenience of operation.

[0038] 4. The trigger component realizes the linkage between the stretching speed of the polyester film and the adjustment of the detection angle of the optical instrument through the combination of centrifugal force and electromagnetic adsorption. In the initial stage of stretching, the centrifugal force at low speed is not enough to overcome the spring force and keep the detection angle stable; as the stretching speed increases, the centrifugal force increases to drive the second connecting magnetic block to move, and after adsorbing with the second electromagnetic adsorption block, it drives the fixed disk to rotate, and then drives the transmission rack to move vertically through the transmission of the synchronous wheel and the connecting gear, so as to realize the timely adjustment of the detection angle of the optical instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0040] Figure 2 It is a schematic diagram of the overall structure of the experimental platform in the present invention;

[0041] Figure 3 It is a schematic diagram of the first internal structure of the experimental platform in the present invention;

[0042] Figure 4 It is a schematic diagram of the second internal structure of the experimental platform in the present invention;

[0043] Figure 5 It is a third internal structure schematic diagram of the experimental platform in the present invention;

[0044] Figure 6 It is a schematic diagram of the overall structure of the transmission platform in the present invention;

[0045] Figure 7 It is a schematic diagram of the structure of the strip arc opening in the present invention;

[0046] Figure 8 It is a schematic diagram of the overall structure of the transmission rack in the present invention;

[0047] Fig. 9 is a cross-sectional view of the experimental platform in the present invention;

[0048] Fig.10 For the present invention Figure 4 A magnified view of the structure at center A;

[0049] Fig.11 For the present invention Figure 5 A magnified view of the structure at B in the middle;

[0050] Fig.12 For the present invention Fig. 9 A magnified view of the structure at C in the middle;

[0051] Fig.13 For the present invention Figure 3 A magnified view of the structure at D in the middle;

[0052] Fig.14 For the present invention Figure 3 Enlarged view of the structure at E in the middle.

[0053] In the figure: 1, workbench; 2, experimental table; 301, driving table; 302, transmission table; 303, first mounting shaft; 304, first worm; 305, first worm wheel; 306, optical instrument mounting frame; 307, transmission gear; 308, strip arc opening; 3081, first strip arc opening; 3082, second strip arc opening; 3083, third strip arc opening; 401, connecting column; 309, transmission rack; 3091, first tooth groove; 3092, second tooth groove; 3093, third tooth groove; 3094, spacing groove; 405, connecting column; 306, first tooth groove; 306, second tooth groove; 306, third ... 02, universal joint; 403, second mounting axis; 404, gantry connecting frame; 501, connecting plate; 502, ratchet; 503, pawl; 504, first electromagnetic adsorption block; 505, first connecting magnetic block; 506, compression spring; 601, mounting gear; 602, second worm; 603, second worm wheel; 701, fixing ring; 702, fixing plate; 703, second electromagnetic adsorption block; 704, mounting frame; 705, connecting spring; 706, second connecting magnetic block; 707, synchronous wheel; 708, connecting gear. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] See also Figure 1-14 The present invention provides a technical solution: a device for detecting the elongation of an automobile polyester film, comprising a workbench 1 and a test bench 2 connected to the workbench 1, comprising:

[0056] The driving platform 301 is rotatably disposed in the experimental platform 2. A driving surface gradually protruding outward is disposed on one side of the driving platform 301. A plurality of strip arc openings 308 penetrating the driving platform 301 are concentrically disposed on the driving surface. The driving surface outside the strip arc openings 308 of the same radius forms a driving portion.

[0057] Two transmission platforms 302 are symmetrically arranged on the left and right sides of the driving platform 301. A frustum-shaped transmission part is arranged on one side of the two transmission platforms 302. The two transmission parts can contact with the driving parts at the same radius or different radii respectively, so as to change the rotation speed of the two transmission platforms 302.

[0058] The optical receiver and the optical transmitter are respectively connected to the corresponding transmission platform 302 through a gear assembly for synchronously adjusting the deflection angles of the optical receiver and the optical transmitter.

[0059] It should be noted that during the testing process, the test bench 2 needs to ensure the temperature of the test environment to avoid the influence of temperature, humidity and air flow on the testing structure. The present invention uses the method of emitting light at the transmitting end and receiving light at the receiving end to monitor the deformation of the polyester film during the stretching process.

[0060] Secondly, two clamps that can slide back to back or relative to each other are provided on the experimental table 2 to clamp and fix the polyester film. Before testing, it is necessary to use a sampling device to intercept the corresponding sample and then rotate it inside the experimental table 2. A bidirectional screw is used to drive the two clamps to move, thereby facilitating the stretching of the polyester film. A drive motor is connected to one side of the experimental table 2 to drive the bidirectional screw to rotate.

[0061] During the specific implementation, two clamps are used to clamp and fix the two sides of the polyester film, and then the driving motor is started to drive the bidirectional screw to rotate, so as to stretch the polyester film. As the bidirectional rotation speed increases and the stretching speed increases, the refractive index of the polyester film changes. At this time, the driving platform 301 is affected by the bidirectional screw and rotates synchronously. Then the driving platform 301 can drive the transmission platform 302 to rotate. During the rotation, the transmission platform 302 can drive the optical instrument to adjust the angle. At the same time, since the driving platform 301 is affected by the bidirectional screw to rotate, in order to avoid excessive angle adjustment of the optical instrument due to continuous transmission of the transmission platform 302 and the driving platform 301, the range of angle adjustment is controlled by the provided strip arc opening 308.

[0062] Secondly, when the polyester film is stretched, its length increases, while the width in the direction perpendicular to the stretching direction may decrease. This deformation causes the light originally parallel to the polyester film to deflect during the stretching process, and in this process, the transmitter is responsible for emitting light, and the receiver is responsible for receiving these light rays. When the stretching speed is too fast, the deformation of the polyester film will also be faster. Since the stretching mainly occurs in the length direction of the polyester film, the deflection of the light when passing through the polyester film is mainly caused by the deformation in this direction. In order to compensate for this deflection, the transmitter needs to adjust its angle faster to ensure that the light can continue to propagate along the predetermined path to the receiver. In contrast, although the receiver also needs to adjust its angle to receive the light, its adjustment speed usually does not need to be as fast as the transmitter. This is because the main task of the receiver is to capture the light from the transmitter, rather than actively guide the propagation direction of the light. As long as the transmitter can maintain the stable propagation of the light, the receiver can receive these light rays by adjusting the angle appropriately. When the stretching speed is too fast, the transmitter needs to adjust its angle faster to compensate for the light deflection caused by the deformation of the polyester film, while the angle adjustment speed of the receiver is relatively slow.

[0063] Therefore, as the driving platform 301 gradually rotates, the driving platform 301 will deflect in the horizontal direction. At this time, the friction forces on the two transmission platforms 302 are different in magnitude and direction, resulting in different rotation speeds at the transmitting end and the receiving end, thereby better adapting to the stretching detection of the polyester film.

[0064] In order to facilitate the transmission platform 302 to drive the optical detection instrument to adjust the angle too much, a special structure is designed on the strip arc 308. For details, please refer to Figure 6 , the strip arc opening 308 includes:

[0065] The third arc opening 3083, the second arc opening 3082 and the first arc opening 3081 of different radii are formed gradually from the edge of the driving surface to the center of the circle. The openings of the first arc opening 3081 and the third arc opening 3083 are opposite, and the radial distance from the second arc opening 3082 is consistent.

[0066] It should be noted that a speed reducer is disposed on one side of the driving platform 301 to reduce the driving force transmitted to the driving platform 301 by the bidirectional lead screw.

[0067] In specific implementation, when the polyester film is gradually stretched, the driving platform 301 is hemispherical and in a low-speed rotation state. At this time, the two transmission platforms 302 are respectively located on the left and right sides of the driving platform 301, and their rotation positions correspond to the second strip arc opening 3082. The two transmission platforms 302 do not directly generate strong friction transmission with the transmission platform 302, so that the transmission platform 302 will not make excessive angle adjustments to the optical instrument.

[0068] As the stretching speed of the polyester film increases, the driving platform 301 gradually shifts in the horizontal direction. As the driving platform 301 shifts, the rotation positions of the two transmission platforms 302 also change accordingly, thereby changing the angle adjustment speed while adjusting the angles of the transmitting end and the receiving end. When the driving platform 301 shifts to a certain extent, the rotation position of one transmission platform 302 corresponds to the third strip arc 3083. At this time, the transmission platform 302 is affected by the third strip arc 3083 to avoid excessive adjustment of the angle of the transmission platform 302. Similarly, the rotation position of the other transmission platform 302 corresponds to the first strip arc 3081. After the other transmission platform 302 rotates to a certain position, it contacts the first strip arc 3081, that is, it no longer sends rotation, to avoid excessive adjustment of the angle.

[0069] In order to facilitate the rotation of the driving platform 301 and the angle adjustment of the detection instrument, the structure of the gear assembly needs to be further disclosed. Please refer to Figure 4 , the gear assembly includes:

[0070] A first mounting shaft 303 is connected to a side of the transmission platform 302 away from the driving platform 301;

[0071] A first worm 304 is connected to the other end of the first mounting shaft 303, the first worm 304 is meshedly connected to a first worm wheel 305, and the first worm wheel 305 is connected to an optical instrument mounting frame 306 that rotates with the rotation of the first worm wheel 305;

[0072] Two optical instrument mounting frames 306 are respectively connected to the light transmitter and the light receiver, and are used to transmit the detection light to the polyester film and receive the light refracted by the polyester film;

[0073] The transmission rack 309 moves vertically upward as the polyester film is stretched, and the transmission gear 307 is meshedly connected to the transmission rack 309 , and the transmission gear 307 is used to drive the driving platform 301 to rotate.

[0074] In specific implementation, when the polyester film begins to be stretched a certain distance, it will drive the transmission rack 309 to move vertically upward, and the upward movement of the transmission rack 309 will drive the transmission gear 307 meshing with it to rotate. The rotation of the transmission gear 307 is transmitted to the driving platform 301, so that the driving platform 301 starts to rotate. As the driving platform 301 rotates, the transmission platform 302 thereon will also rotate, and then the first installation shaft 303 drives the first worm 304 to rotate. During the rotation of the first worm 304, the optical instrument mounting frame 306 rotates with the rotation of the first worm gear 305, ensuring that the light transmitter and the light receiver can accurately align with the detection point on the polyester film.

[0075] In order to enable the drive platform 301 to rotate around its axis and to shift horizontally, please refer to Figures 4 to 5 , Figures 9 and 10 , the experimental table 2 is also provided with a first transmission assembly. The first transmission assembly includes:

[0076] Rotate the connecting column 401 disposed in the experimental table 2, and as the connecting column 401 rotates, the driving table 301 generates a horizontal deflection;

[0077] The universal connector 402 is hemispherical and has a spherical cavity therein, which is rotatably connected to the connecting column 401. The driving platform 301 is connected to one side of the universal connector 402 via a short-circuit rod.

[0078] The second mounting shaft 403 is rotatably connected in the universal joint 402, and a gantry connecting frame 404 is rotatably connected to the second mounting shaft 403. The other end of the gantry connecting frame 404 is connected to the transmission gear 307. As the transmission gear 307 rotates, the gantry connecting frame 404 rotates and drives the driving platform 301 to rotate.

[0079] It should be noted that connecting ports are respectively provided on both sides of the connecting column 401. The connecting port corresponding to the short-circuit rod has a smaller diameter, which facilitates the horizontal rotation of the driving platform 301 during the rotation of the connecting column 401. The connecting port on the side corresponding to the gantry connecting frame 404 has a larger diameter to avoid affecting the rotation of the gantry connecting frame 404. At the same time, the reducer mentioned above is connected between the gantry connecting frame 404 and the transmission gear 307.

[0080] In specific implementation, the universal connector 402 is hemispherical, and the spherical cavity opened inside it allows it to realize multi-directional rotation connection with the connecting column 401. The universal connector 402 can deflect in the horizontal direction while the connecting column 401 rotates, and the driving platform 301 is connected to one side of the universal connector 402 through a short-circuit rod. Therefore, when the universal connector 402 moves or rotates in the spherical cavity, it will drive the driving platform 301 to produce a corresponding deflection in the horizontal direction. The second installation shaft 403 is rotationally connected in the universal connector 402. The rotation of the second installation shaft 403 will not directly affect the deflection of the universal connector 402 in the horizontal direction, but will transmit rotational power. When the transmission gear 307 is driven by the transmission rack 309 to rotate, it will drive the universal connector 402 and the driving platform 301 connected thereto to rotate around its axis through the gantry connecting frame 404 and the second installation shaft 403. Due to the spherical connection characteristics of the universal joint 402 , this rotation will not be affected by the horizontal deflection of the driving platform 301 .

[0081] To facilitate the rotation of the drive connecting column 401, please refer to Figure 4 and Figure 5, further comprising a second transmission assembly, the second transmission assembly comprising:

[0082] The mounting gear 601 is rotatably disposed in the experimental table 2 and meshes with the transmission rack 309. A second worm 602 is coaxially disposed on the mounting gear 601 and rotates synchronously with the rotation of the mounting gear 601.

[0083] The second worm gear 603 is connected to the connecting post 401 to drive the connecting post 401 to rotate, and the second worm 602 and the second worm gear 603 are meshed with each other.

[0084] In specific implementation, when the transmission rack 309 moves upward, the mounting gear 601 is driven to rotate. When the mounting gear 601 is driven to rotate by the transmission rack 309, the second worm 602 will also rotate synchronously. When the second worm 602 rotates, the second worm wheel 603 is driven to rotate. Since the second worm wheel 603 is connected to the connecting column 401, the rotation of the second worm wheel 603 will drive the connecting column 401 to rotate together. The rotation of the connecting column 401 will be further transmitted to the driving platform 301 through the universal joint 402 and the short-circuit rod, so that the driving platform 301 is deflected in the horizontal direction.

[0085] During the detection process, the optical detection instrument can be intermittently adjusted in angle due to the provision of the strip arc opening 308. When the transmission platform 302 contacts the strip arc opening 308, in order to prevent the optical detection instrument from shaking due to inertial deflection, an anti-shake component is designed. Please refer to Figure 8 and Fig.11 , the experimental bench 2 is also equipped with anti-shake components, including:

[0086] A connecting disk 501 connected to the experimental table 2, a ratchet 502 is rotatably connected in the connecting disk 501, a first installation shaft 303 is connected to the ratchet 502, a pawl 503 is rotatably connected in the connecting disk 501, and the pawl 503 and the ratchet 502 are meshed with each other;

[0087] The first electromagnetic adsorption block 504 is connected to the connection disk 501, and the first connection magnetic block 505 is connected to the pawl 503. The position of the first connection magnetic block 505 corresponds to the first electromagnetic adsorption block 504. The first electromagnetic adsorption block 504 is used to adsorb the first connection magnetic block 505 so that the pawl 503 rotates and no longer meshes with the ratchet 502.

[0088] The compression spring 506 has one end connected to the pawl 503 and the other end connected to the inner wall of the connecting disk 501 .

[0089] In specific implementation, the pawl 503 maintains an engagement state with the ratchet 502, restricting the reverse rotation of the ratchet 502, and preventing the optical instrument from shaking due to inertia, thereby ensuring the stable operation of the first mounting shaft 303 and the connected components. At this time, the first electromagnetic adsorption block 504 does not work, and there is no interaction between the first connection magnetic block 505 and the first electromagnetic adsorption block 504. After the polyester film elongation test is completed, the first electromagnetic adsorption block 504 is activated to generate magnetic force to adsorb the first connection magnetic block 505. Since the first connection magnetic block 505 is connected to the pawl 503, the pawl 503 will be subjected to an outward force, overcoming the elastic force of the compression spring 506, generating rotation, thereby disengaging from the ratchet 502, and facilitating the optical instrument to return to its original position.

[0090] Among them, during the stretching process of the polyester film, in the initial state of stretching, the refractive index of the polyester film changes little, and there is no need to adjust the detection angle of the optical instrument. When the stretching speed reaches a certain speed, the stretching speed of the polyester film becomes faster, and the refractive index changes. Therefore, it is necessary to adjust the detection angle of the optical instrument. For this reason, it is necessary to design a trigger component to drive the optical instrument to adjust the angle after the rotation speed of the bidirectional screw reaches a certain range. Please refer to Fig.13 , the experimental bench 2 is also equipped with a trigger component, including:

[0091] The fixed ring 701 is connected to the bidirectional screw that drives the polyester film to stretch. At least two mounting frames 704 are connected to the fixed ring 701. The mounting frames 704 are connected to connecting springs 705. The other end of the connecting spring 705 is connected to a second connecting magnetic block 706. As the stretching speed increases, the rotation speed of the bidirectional screw increases, and the centrifugal force of the fixed ring 701 gradually increases. When the centrifugal force of the fixed ring 701 is greater than the elastic force of the connecting spring 705, the second connecting magnetic block 706 moves away from the center of the fixed ring 701.

[0092] The fixed disk 702 is rotatably arranged in the experimental table 2. The inner wall of the fixed disk 702 is connected with at least two second electromagnetic adsorption blocks 703 along the circumferential direction. The second connecting magnetic block 706 moves in the direction away from the center of the fixed ring 701, and finally adsorbs and fixes with the second electromagnetic adsorption block 703 to drive the fixed disk 702 to rotate.

[0093] In specific implementation, in the initial stage of stretching the polyester film, the stretching speed is slow and the rotation speed of the bidirectional screw is relatively low. At this time, the fixing ring 701 is connected to the bidirectional screw and rotates with it, but the centrifugal force generated is small. The mounting frame 704 is connected to the second connecting magnetic block 706 through the connecting spring 705. The elastic force of the connecting spring 705 keeps the second connecting magnetic block 706 in the initial position and does not contact the second electromagnetic adsorption block 703 on the fixed disk 702. As the stretching speed of the polyester film increases, the rotation speed of the bidirectional screw also increases accordingly. The centrifugal force generated by the fixed ring 701 as it rotates with the bidirectional lead screw gradually increases. When the centrifugal force of the fixed ring 701 increases to a level sufficient to overcome the elastic force of the connecting spring 705, the mounting frame 704 and the second connecting magnetic block 706 begin to move in a direction away from the center of the fixed ring 701. The second connecting magnetic block 706 continues to move outward until it contacts the second electromagnetic adsorption block 703 on the inner wall of the fixed disk 702. Due to the adsorption effect of the second connecting magnetic block 706 and the second electromagnetic adsorption block 703, this rotational force will be transmitted to the fixed disk 702, driving the fixed disk 702 to start rotating. When the polyester film stretching process is completed, the magnetic force of the second electromagnetic adsorption block 703 is turned off, so that the second connecting magnetic block 706 is separated from the second electromagnetic adsorption block 703. The elastic force of the connecting spring 705 will pull the second connecting magnetic block 706 back to the initial position, and the fixed disk 702 stops rotating.

[0094] Further, in order to facilitate the movement of the transmission rack 309, please refer to Fig.12 The trigger assembly also includes a synchronous wheel 707 rotatably connected to the experimental table 2, a synchronous belt is connected to the synchronous wheel 707 and the fixed plate 702, a connecting gear 708 is coaxially connected to the synchronous wheel 707, and rotates with the rotation of the synchronous wheel 707. The connecting gear 708 is meshed with one side of the driving platform 301 to drive the transmission rack 309 to move vertically upward.

[0095] During specific implementation, when the fixed plate 702 rotates, the synchronous wheel 707 will be driven to rotate synchronously, thereby driving the connecting gear 708 to rotate, so that the connecting gear 708 drives the transmission rack 309 to move vertically upward.

[0096] For the convenience of transmission rack 309 can drive multiple parts transmission, please refer to Figure 7 The transmission rack 309 includes a second tooth groove 3092, a third tooth groove 3093 and a first tooth groove 3091 which are sequentially opened from bottom to top, wherein the second tooth groove 3092 and the third tooth groove 3093 are on opposite sides of the transmission rack 309, and the first tooth groove 3091 is located on the other side of the transmission rack 309, the second tooth groove 3092 is meshed with the connecting gear 708, the first tooth groove 3091 is meshed with the transmission gear 307, and the third tooth groove 3093 is meshed with the mounting gear 601.

[0097] In a specific implementation, the second tooth groove 3092 is meshed with the connecting gear 708. When the transmission rack 309 moves in the vertical direction, the second tooth groove 3092 drives the connecting gear 708 to rotate. Such rotation may be used to drive the connecting gear 708. The first tooth groove 3091 is meshed with the transmission gear 307. The first tooth groove 3091 is located at a higher position, so when the transmission rack 309 moves upward, it will first contact the transmission gear 307 and drive it to rotate. The third tooth groove 3093 is meshed with the mounting gear 601. The third tooth groove 3093 is located above the second tooth groove 3092 and on the other side of the transmission rack 309, so when the transmission rack 309 continues to move upward, it will contact the mounting gear 601 and drive it to rotate.

[0098] Please continue to refer to Fig.12 The transmission rack 309 is also provided with a spacing groove 3094, which is located on the same side of the transmission rack 309 as the third tooth groove 3093. The spacing groove 3094 is used to enable the transmission rack 309 to rise vertically for a certain distance before the third tooth groove 3093 engages with the mounting gear 601 to drive the driving platform 301 to deflect horizontally.

[0099] In specific implementation, when the transmission rack 309 starts to move in the vertical direction, it will first mesh with the connecting gear 708 and the transmission gear 307 and drive them to rotate. Due to the existence of the spacing groove 3094, the transmission rack 309 needs to continue to rise vertically until the spacing groove 3094 completely passes the position of the mounting gear 601, and the third tooth groove 3093 will contact and mesh with the mounting gear 601. This design leads to a "delay" effect, that is, the vertical movement of the transmission rack 309 will not immediately cause the horizontal deflection of the drive platform 301, but needs to wait for the spacing groove 3094 to pass. This setting makes it possible to drive the drive platform 301 to deflect horizontally only after the polyester film is stretched to a certain position.

[0100] Working principle:

[0101] When in use, in the initial stage of stretching the polyester film, the stretching speed is slow and the rotation speed of the bidirectional screw is relatively low. At this time, the fixed ring 701 is connected to the bidirectional screw and rotates with it, but the centrifugal force generated is small. As the stretching speed of the polyester film increases, the rotation speed of the bidirectional screw also increases accordingly. The centrifugal force generated by the fixed ring 701 when rotating with the bidirectional screw gradually increases. When the centrifugal force of the fixed ring 701 increases to a level sufficient to overcome the elastic force of the connecting spring 705, the second connecting magnetic block 706 moves outward until it contacts the second electromagnetic adsorption block 703 on the inner wall of the fixed disk 702. Due to the adsorption effect of the second connecting magnetic block 706 and the second electromagnetic adsorption block 703, this rotational force will be transmitted to the fixed disk 702, driving the fixed disk 702 to start rotating.

[0102] When the fixed plate 702 rotates, the synchronous wheel 707 will be driven to rotate synchronously, thereby driving the connecting gear 708 to rotate, so that the connecting gear 708 drives the transmission rack 309 to move vertically upward through the first tooth groove 3091 to drive the transmission gear 307 to rotate, and then drives the universal connector 402 and the driving platform 301 connected thereto to rotate around its axis through the gantry connecting frame 404 and the second installation shaft 403. At this time, the driving platform 301 is in a low-speed rotation state. At this stage, the rotation positions of the two driving platforms 302 correspond to the second strip arc opening 3082, and the contact between them and the driving platform 302 is not sufficient to generate strong friction transmission. When the driving platform 301 rotates to the second strip arc opening 3082 and contacts with the driving platform 302, the driving platform 302 no longer rotates, thereby avoiding over-adjustment.

[0103] As the rotation speed of the bidirectional screw increases, the third tooth groove 3093 on the transmission rack 309 can drive the installation gear 601 to rotate. When the installation gear 601 is driven to rotate by the transmission rack 309, the second worm 602 will also rotate synchronously. When the second worm 602 rotates, it drives the second worm wheel 603 to rotate. Since the second worm wheel 603 is connected to the connecting column 401, the rotation of the second worm wheel 603 will drive the connecting column 401 to rotate together. The rotation of the connecting column 401 will be further transmitted to the driving platform 301 through the universal joint 402 and the short-circuit rod, so that the driving platform 301 will deflect in the horizontal direction.

[0104] As the driving platform 301 gradually rotates, the driving platform 301 will deflect in the horizontal direction. At this time, the friction forces on the two transmission platforms 302 are different in magnitude and direction, resulting in different rotation speeds at the transmitting end and the receiving end, thereby better adapting to the stretching test of the polyester film.

[0105] When the transmission platform 302 contacts the strip arc opening 308, in order to prevent the optical detection instrument from shaking due to inertia deflection, the pawl 503 and the ratchet 502 remain in meshing state when the transmission platform 302 rotates, limiting the reverse rotation of the ratchet 502, and preventing the optical instrument from shaking due to inertia, thereby ensuring the stable operation of the first mounting shaft 303 and the connected components. At this time, the first electromagnetic adsorption block 504 does not work, and there is no interaction between the first connection magnetic block 505 and the first electromagnetic adsorption block 504. When the polyester film elongation test is completed, the first electromagnetic adsorption block 504 is activated to generate magnetic force to adsorb the first connection magnetic block 505. Since the first connection magnetic block 505 is connected to the pawl 503, the pawl 503 will be subjected to an outward force, overcome the elastic force of the compression spring 506, and rotate, thereby disengaging from the ratchet 502, so that the optical instrument can return to its original position.

Claims

1. An automotive polyester film elongation detection device, comprising a workbench (1) and a test bench (2) connected to the workbench (1), characterized in that: A driving platform (301) is rotatably arranged in the experimental platform (2), a driving surface gradually protruding outward is arranged on one side of the driving platform (301), a plurality of strip-shaped arc openings (308) penetrating the driving platform (301) are concentrically arranged on the driving surface, and the driving surface outside the strip-shaped arc openings (308) of the same radius forms a driving portion; Two transmission platforms (302) are symmetrically arranged on the left and right sides of the driving platform (301), and one side of the two transmission platforms (302) is provided with a transmission part in the shape of a cone. The two transmission parts can respectively contact with the driving parts under the same radius or different radii, so as to change the rotation speed of the two transmission platforms (302); The optical receiver and the optical transmitter are respectively connected to the corresponding transmission platform (302) through a gear assembly for synchronously adjusting the deflection angles of the optical receiver and the optical transmitter.

2. The automotive polyester film elongation detection device according to claim 1, characterized in that: The strip arc opening (308) is opened gradually from the edge of the driving surface toward the center of the circle to form a third strip arc opening (3083), a second strip arc opening (3082) and a first strip arc opening (3081) of different radii. The openings of the first strip arc opening (3081) and the third strip arc opening (3083) are opposite, and the radial distances from the second strip arc opening (3082) are consistent.

3. The automotive polyester film elongation detection device according to claim 1, characterized in that: The gear assembly comprises: A first mounting shaft (303) is connected to a side of the transmission platform (302) away from the driving platform (301); A first worm (304) is connected to the other end of the first mounting shaft (303); the first worm (304) is meshedly connected to a first worm wheel (305); the first worm wheel (305) is connected to an optical instrument mounting frame (306) that rotates with the rotation of the first worm wheel (305); Two optical instrument mounting frames (306) are respectively connected to the light transmitter and the light receiver, and are used to transmit detection light to the polyester film and receive light refracted by the polyester film; The transmission rack (309) moves vertically upward as the polyester film is stretched, and the transmission rack (309) is meshedly connected with a transmission gear (307), and the transmission gear (307) is used to drive the driving platform (301) to rotate.

4. The automotive polyester film elongation detection device according to claim 1, characterized in that: The experimental table (2) is also provided with a first transmission assembly, including: Rotating a connecting column (401) disposed in the experimental platform (2), so that as the connecting column (401) rotates, the driving platform (301) generates a horizontal deflection; The universal connector (402) is hemispherical and has a spherical cavity therein, and is rotatably connected to the connecting column (401). The driving platform (301) is connected to one side of the universal connector (402) via a short-circuit rod; The second installation shaft (403) is rotatably connected in the universal joint (402). A gantry connecting frame (404) is rotatably connected to the second installation shaft (403). The other end of the gantry connecting frame (404) is connected to the transmission gear (307). As the transmission gear (307) rotates, the gantry connecting frame (404) rotates, thereby driving the driving platform (301) to rotate.

5. The automotive polyester film elongation detection device according to claim 4, characterized in that: The second transmission assembly comprises: A mounting gear (601) is rotatably arranged in the experimental table (2) and meshes with the transmission rack (309); a second worm (602) is coaxially arranged on the mounting gear (601) and rotates synchronously with the rotation of the mounting gear (601); The second worm gear (603) is connected to the connecting post (401) to drive the connecting post (401) to rotate, and the second worm (602) and the second worm gear (603) are meshed with each other.

6. The automotive polyester film elongation detection device according to claim 3, characterized in that: The experimental platform (2) is also provided with an anti-shake component, including: A connecting disk (501) connected to the experimental table (2), a ratchet (502) rotatably connected to the connecting disk (501), the first mounting shaft (303) connected to the ratchet (502), a ratchet pawl (503) rotatably connected to the connecting disk (501), and the ratchet pawl (503) and the ratchet (502) meshing with each other; The first electromagnetic adsorption block (504) is connected to the connection disk (501), the pawl (503) is connected to the first connection magnetic block (505), the position of the first connection magnetic block (505) corresponds to the first electromagnetic adsorption block (504), and the first electromagnetic adsorption block (504) is used to adsorb the first connection magnetic block (505) so that the pawl (503) rotates and no longer meshes with the ratchet (502); The compression spring (506) has one end connected to the pawl (503) and the other end connected to the inner wall of the connecting plate (501).

7. The automotive polyester film elongation detection device according to claim 1, characterized in that: The experimental table (2) is also provided with a trigger component, including: A fixing ring (701) is connected to a bidirectional screw rod for driving the polyester film to stretch, and at least two mounting frames (704) are connected to the fixing ring (701). The mounting frames (704) are connected to connecting springs (705), and the other end of the connecting springs (705) is connected to a second connecting magnetic block (706), wherein: As the stretching speed increases, the rotation speed of the bidirectional screw increases, and the centrifugal force of the fixing ring (701) gradually increases. When the centrifugal force of the fixing ring (701) is greater than the elastic force of the connecting spring (705), the second connecting magnetic block (706) moves in a direction away from the center of the fixing ring (701); The fixed disk (702) is rotatably arranged in the experimental table (2); the inner wall of the fixed disk (702) is connected to at least two second electromagnetic adsorption blocks (703) along the circumferential direction; the second connection magnetic block (706) moves in a direction away from the center of the fixed ring (701) and finally adsorbs and fixes with the second electromagnetic adsorption block (703), thereby driving the fixed disk (702) to rotate.

8. The automotive polyester film elongation detection device according to claim 7, characterized in that: The trigger assembly also includes a synchronous wheel (707) rotatably connected to the experimental table (2), a synchronous belt is connected to the fixed plate (702) in a transmission manner, and a connecting gear (708) is coaxially connected to the synchronous wheel (707). The connecting gear (708) rotates with the rotation of the synchronous wheel (707), and the connecting gear (708) is meshed with one side of the driving table (301), driving the transmission rack (309) to move vertically upward.

9. The automotive polyester film elongation detection device according to claim 8, characterized in that: The transmission rack (309) comprises: a second tooth groove (3092), a third tooth groove (3093) and a first tooth groove (3091) which are sequentially opened from bottom to top. The second tooth groove (3092) and the third tooth groove (3093) are on opposite sides of the transmission rack (309), the first tooth groove (3091) is located on the other side of the transmission rack (309), the second tooth groove (3092) is meshed with the connecting gear (708), the first tooth groove (3091) is meshed with the transmission gear (307), and the third tooth groove (3093) is meshed with the mounting gear (601).

10. The automotive polyester film elongation detection device according to claim 9, characterized in that: The transmission rack (309) is also provided with a spacing groove (3094), the spacing groove (3094) and the third tooth groove (3093) being located on the same side of the transmission rack (309), and the spacing groove (3094) is used to enable the transmission rack (309) to vertically rise a certain distance before the third tooth groove (3093) engages with the mounting gear (601) to drive the driving platform (301) to deflect horizontally.

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