Tension detection structure of ethylene-vinyl acetate copolymer and cutting and laying machine

Abstract

The utility model provides an ethylene-vinyl acetate copolymer tension detection structure and a cutting and laying machine, and the tension detection structure comprises a guide roller which extends along a first direction; the linear guide rail extends in the second direction, and the linear guide rail and the guide roller are arranged in a spaced mode in the third direction; the gravity roller extends in the first direction and is movably arranged on the linear guide rail, the gravity roller and the guide roller can guide and convey the ethylene-vinyl acetate copolymer, and every two of the first direction, the second direction and the third direction are perpendicular to each other; and the sensor is used for detecting the position, the speed and the acceleration of the gravity roller in real time so as to allow the tension of the ethylene-vinyl acetate copolymer to be calculated. The tension of the ethylene-vinyl acetate copolymer can be detected in real time through the tension detection structure, data basis is provided for subsequent links, the situation after the ethylene-vinyl acetate copolymer changes is effectively dealt with, and the production stability, consistency, applicability and production efficiency are integrally improved.

Description

Technical Field

[0001] This disclosure relates to the field of ethylene-vinyl acetate copolymer technology, and more particularly to a tension detection structure for ethylene-vinyl acetate copolymer and a cutting and laying machine including the tension detection structure. Background Technology

[0002] Cutting and laying machines are important equipment in the photovoltaic industry. They cut and lay ethylene-vinyl acetate copolymer to a set size on photovoltaic glass, bonding the photovoltaic glass, solar cells and backsheet together. At the same time, they protect the solar cells and isolate them from the air. Therefore, the requirements for the tensile deformation and dimensions of the ethylene-vinyl acetate copolymer are very high.

[0003] Currently, most mainstream equipment uses constant torque motor control, which fails to form a closed-loop control. This results in the deformation and laying size of the ethylene-vinyl acetate copolymer exceeding the requirements, causing the conveyor to deviate from its designated path. The root cause is that the torque provided by the motor cannot be adjusted in real time according to changes in the diameter and thickness of the ethylene-vinyl acetate copolymer. Utility Model Content

[0004] One of the technical problems to be solved by this disclosure is: how to detect the tension of ethylene-vinyl acetate copolymer in real time.

[0005] To address the aforementioned technical problems, one embodiment of this disclosure provides a tension detection structure for ethylene-vinyl acetate copolymer, comprising: a guide roller extending along a first direction; a linear guide rail extending along a second direction, the linear guide rail and the guide roller being spaced apart in a third direction; a gravity roller extending along the first direction and movably disposed on the linear guide rail, the gravity roller and the guide roller being capable of guiding and conveying the ethylene-vinyl acetate copolymer, the first direction, the second direction, and the third direction being perpendicular to each other; and a sensor for real-time detection of the position, speed, and acceleration of the gravity roller to allow calculation of the tension of the ethylene-vinyl acetate copolymer.

[0006] In some embodiments, the tension detection structure further includes a bracket, with both ends of the guide roller disposed on the bracket, and the linear guide rails including a first linear guide rail and a second linear guide rail disposed on the bracket and spaced apart along a first direction, and both ends of the gravity roller disposed on the first linear guide rail and the second linear guide rail respectively.

[0007] In some embodiments, the bracket includes a first support plate, a second support plate, and a connector connecting the first support plate and the second support plate, wherein the first support plate and the second support plate are parallel to each other and both are perpendicular to the extension direction of the connector.

[0008] In some embodiments, the connectors are four crossbeams.

[0009] In some embodiments, the guide roller includes a first guide roller and a second guide roller, the distance between the first guide roller and the linear guide in a third direction is equal to the distance between the linear guide and the second guide roller in a third direction, and the distance between the first guide roller and the gravity roller in a second direction is equal to the distance between the gravity roller and the second guide roller in a second direction.

[0010] In some embodiments, an upper limit block and a lower limit block are respectively provided at both ends of the linear guide.

[0011] In some embodiments, a sensor bracket is fixedly mounted on the bracket, and the sensor bracket is located directly above and / or directly below the linear guide rail.

[0012] In some embodiments, the sensor is a laser sensor.

[0013] In some embodiments, the linear guide includes a slider with reflective markings to enhance the detection capability of the laser sensor.

[0014] Another aspect of this disclosure provides a cutting and laying machine that includes a tension detection structure.

[0015] In some embodiments, the cutting and laying machine further includes a controller and a drive motor controlled by the controller, the drive motor being able to adjust its output torque in real time according to changes in the ethylene-vinyl acetate copolymer to form a closed-loop control.

[0016] Through the above technical solution, the tension detection structure provided in this disclosure can detect the tension of ethylene-vinyl acetate copolymer in real time and provide data basis for subsequent processes, effectively responding to various situations after changes in ethylene-vinyl acetate copolymer, thereby improving overall production stability, consistency, applicability and production efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of some embodiments disclosed in this disclosure;

[0019] Figure 2 This is a top view structural diagram of some embodiments disclosed in this disclosure;

[0020] Figure 3 This is a cross-sectional view of some embodiments disclosed in this disclosure.

[0021] Explanation of reference numerals in the attached figures:

[0022] 10. Linear guide rail; 101. Upper limit block; 102. Lower limit block; 11. First linear guide rail; 12. Second linear guide rail; 20. Gravity roller; 30. Guide roller; 31. First guide roller; 32. Second guide roller; 40. Sensor; 401. Sensor bracket; 51. First support plate; 52. Second support plate; 60. Connector. Detailed Implementation

[0023] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0024] These embodiments are provided to make the disclosure thorough and complete, and to fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0025] It should be noted that, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationship, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0026] Furthermore, the terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible margin of error. "Parallel" is not strictly parallel, but within the permissible margin of error. Terms such as "including" or "contains" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0027] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure depending on the specific circumstances. When a particular device is described as being located between a first device and a second device, an intermediary device may or may not be present between the particular device and the first or second device.

[0028] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0029] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0030] like Figure 1-3 As shown, this disclosure provides a tension detection structure for ethylene-vinyl acetate copolymer, comprising: a guide roller 30 extending along a first direction; a linear guide rail 10 extending along a second direction, the linear guide rail 10 and the guide roller 30 being spaced apart in a third direction; a gravity roller 20 extending along the first direction and movably disposed on the linear guide rail 10, the gravity roller 20 and the guide roller 30 being capable of guiding and conveying the ethylene-vinyl acetate copolymer, the first direction, the second direction and the third direction being perpendicular to each other; and a sensor 40 for real-time detection of the position, speed and acceleration of the gravity roller 20 to allow calculation of the tension of the ethylene-vinyl acetate copolymer.

[0031] Ethylene-vinyl acetate copolymer (EVA) is typically used in roll form in tension detection structures. Specifically, the EVA is in direct contact with both the gravity roller 20 and the guide roller 30. The bottom surface of the EVA (facing the ground) supports the roller surface of the guide roller 30, and the top surface of the EVA supports the roller surface of the gravity roller 20. The gravity roller 20 and the guide roller 30 rotate at the same speed and direction, thus jointly guiding and conveying the EVA. The sensor 40 has data acquisition and processing functions, and can calculate the real-time position, velocity, and acceleration of the gravity roller 20 based on its real-time position changes.

[0032] The working principle of the tension detection structure is as follows: During the guiding and conveying of ethylene-vinyl acetate copolymer, if the ethylene-vinyl acetate copolymer itself remains stable, that is, if its characteristics such as diameter and thickness do not change, the relative positions of the gravity roller 20 and the guide roller 30 will not change. However, when the various characteristic parameters of the ethylene-vinyl acetate copolymer change, its supporting capacity for the gravity roller 20 will also change accordingly (for example, the larger the diameter of the ethylene-vinyl acetate copolymer, the stronger its pressure resistance and the smaller its deformation, and vice versa). This causes the gravity roller 20 to move upward or downward on the linear guide rail 10 in a direction perpendicular to the horizontal plane, at which point the relative positions of the gravity roller 20 and the guide roller 30 change. When the relative positions of the gravity roller 20 and the guide roller 30 change, the tension of the ethylene-vinyl acetate copolymer can be calculated by combining existing formulas and the position, speed, and acceleration data of the gravity roller 20 detected in real time by the sensor 40.

[0033] like Figure 3 As shown, combine the following calculation formula:

[0034] A = arctan(L1 / L2)

[0035] a=(V2-V1) / t

[0036] F = M * (a + g) / cosA

[0037] in:

[0038] M is the total mass of gravity roller 20 and its accessories (accessories are objects that move with gravity roller 20, such as the slider of a linear guide);

[0039] V1 and V2 are the instantaneous velocities of gravity roller 20;

[0040] t is the time interval between the two instantaneous velocities V1 and V2 (t takes a very small value);

[0041] g is the acceleration due to gravity;

[0042] a is the acceleration of gravity roller 20 and its accessories;

[0043] A is the angle between the ethylene-vinyl acetate copolymer and the centerline of the linear guide 10;

[0044] L1 is the distance between guide roller 30 and gravity roller 20 in the third direction;

[0045] L2 is the distance between the guide roller 30 and the gravity roller 20 in the second direction;

[0046] F represents the tension of the ethylene-vinyl acetate copolymer (since factors such as friction are not considered, the tension calculated here is actually an approximation of the real tension, but it is sufficient to understand the tension changes of the material and take corresponding measures).

[0047] In some embodiments, the tension detection structure further includes a bracket, with both ends of the guide roller 30 disposed on the bracket, and the linear guide rail 10 including a first linear guide rail 11 and a second linear guide rail 12 disposed on the bracket and spaced apart along a first direction, with both ends of the gravity roller 20 disposed on the first linear guide rail 11 and the second linear guide rail 12 respectively.

[0048] Specifically, such as Figure 1 As shown, the bracket has corresponding through holes, and bearings are installed in the through holes. The two shaft ends of the guide roller 30 are supported by the bearings and can rotate freely within the bearings. Of course, in some embodiments, bearing seats with corresponding positions can also be fixedly installed on the inner wall of the bracket (the wall of the bracket facing the guide roller 30), and the two shaft ends of the guide roller 30 are supported by the bearings in the bearing seats. The first linear guide rail 11 and the second linear guide rail 12 are corresponding to each other in their setting positions.

[0049] In some embodiments, the bracket includes a first support plate 51, a second support plate 52, and a connector 60 connecting the first support plate 51 and the second support plate 52. The first support plate 51 and the second support plate 52 are parallel to each other and both are perpendicular to the extension direction of the connector 60.

[0050] Specifically, the connector 60 extends in the first direction, which helps to ensure the parallelism of the first support plate 51 and the second support plate 52, and enhances the overall strength and stability of the tension detection structure.

[0051] In some embodiments, the first support plate 51 and the second support plate 52 are parallel flat plates with identical dimensions and shapes. The first linear guide rail 11 is fixedly disposed at the center of one of the first support plate 51 and the second support plate 52, and the second linear guide rail 12 is fixedly disposed at the center of the other of the first support plate 51 and the second support plate 52. In this case, the first support plate 51 and the second support plate 52 are symmetrical about their mid-plane, which is also the plane of symmetry of the first linear guide rail 11 and the second linear guide rail 12.

[0052] In some embodiments, the connector 60 consists of four crossbeams.

[0053] like Figure 1 and Figure 3As shown, the connector 60 can be a crossbeam, extending along a first direction and having its two ends threadedly connected to the first support plate 51 and the second support plate 52, respectively. Alternatively, the two ends of the crossbeam can be welded to the first support plate 51 and the second support plate 52, or connected to them in other common ways, as long as the connection is a fixed connection. There are four crossbeams, evenly distributed at the four corners of the first support plate 51 and the second support plate 52.

[0054] In some embodiments, the connector 60 consists of two connecting plates spaced apart along a third direction. The two connecting plates are parallel and perpendicular to the first support plate 51 and the second support plate 52. The distances between the two connecting plates and the gravity roller 20 in the third direction are equal and greater than the distances between the guide roller 30 and the gravity roller 20 in the third direction.

[0055] In some embodiments, the guide roller 30 includes a first guide roller 31 and a second guide roller 32. The distance between the first guide roller 31 and the linear guide rail 10 in the third direction is equal to the distance between the linear guide rail 10 and the second guide roller 32 in the third direction. The distance between the first guide roller 31 and the gravity roller 20 in the second direction is equal to the distance between the gravity roller 20 and the second guide roller 32 in the second direction.

[0056] Specifically, such as Figure 2 and Figure 3 As shown, the first guide roller 31 and the second guide roller 32 are symmetrical to the plane jointly defined by the centerline of the linear guide rail 10 and the first direction. This ensures that the ethylene-vinyl acetate copolymer is subjected to uniform force, especially ensuring that the pressure applied to the ethylene-vinyl acetate copolymer by the gravity roller 20 is evenly distributed on the contact surface between the two rollers, thereby enhancing the structural stability and safety of the ethylene-vinyl acetate copolymer. If the force is uneven on one surface of the ethylene-vinyl acetate copolymer, local deformation may occur, affecting its shape and dimensional accuracy; or it may lead to fatigue cracks or fractures due to stress concentration, etc., which will not be listed here.

[0057] In some embodiments, the linear guide 10 is provided with an upper limit block 101 and a lower limit block 102 at both ends.

[0058] Setting up upper limit block 101 and lower limit block 102 helps ensure the safe, precise operation and structural stability of the linear guide 10. Specifically, upper limit block 101 and lower limit block 102 prevent the slider of the linear guide 10 from detaching from both ends of the guide rail; upper limit block 101 and lower limit block 102 work together to limit the stroke, ensuring that the slider moves within a preset stroke range. In particular, the setting of lower limit block 102 can effectively control the maximum deformation of the ethylene-vinyl acetate copolymer acted upon by gravity roller 20, avoiding adverse consequences such as permanent deformation, cracking, or even breakage of the ethylene-vinyl acetate copolymer due to exceeding the maximum deformation limit.

[0059] In some embodiments, a sensor bracket 401 is fixedly mounted on the bracket, and the sensor bracket 401 is located directly above and / or directly below the linear guide rail 10.

[0060] Specifically, sensor 40 is supported by sensor bracket 401. Positioning sensor 40 directly above and / or below the linear guide rail 10 provides more accurate feedback signals and avoids potential mechanical interference or obstructions from the sides of the linear guide rail 10. When both sensor bracket 401 and sensor 40 are positioned directly above and below the linear guide rail 10, the sensors 40 cooperate with each other. Of course, the sensor bracket 401 not being directly above and / or below the linear guide rail 10 is not mandatory; its actual position needs to be determined based on specific application requirements and system layout.

[0061] In some embodiments, sensor 40 is a laser sensor.

[0062] Specifically, the laser sensor can more accurately measure the displacement of the gravity roller 20 relative to the sensor 40, and by continuously measuring the displacement of the gravity roller 20, it can also indirectly measure the speed and acceleration of the gravity roller 20. Of course, the laser sensor can be further used in conjunction with speed sensors and acceleration sensors to meet the requirements of high-precision speed and acceleration measurement.

[0063] In some embodiments, the linear guide 10 includes a slider with reflective markings to enhance the detection capability of the laser sensor.

[0064] Specifically, one or more reflective markers can be set, and the reflective markers can be dots or lines of different colors or reflective properties in order to distinguish them from the rest of the slider.

[0065] In some embodiments, if necessary, an inertial measurement unit integrating multiple sensors may be used instead of sensor 40 to accurately measure and report the orientation, position, velocity, and acceleration of gravity roller 20.

[0066] This disclosure also provides a cutting and laying machine, including a tension detection structure.

[0067] Cutting and laying machines generally also include an unwinding mechanism for placing and releasing ethylene-vinyl acetate copolymer rolls, a cutting mechanism for cutting ethylene-vinyl acetate copolymer materials to set dimensions, a laying mechanism for automatically laying the cut ethylene-vinyl acetate copolymer materials onto the substrate of photovoltaic modules, and a control system.

[0068] The control system controls the unwinding process based on the detection results fed back from the tension detection structure. Specifically, the control system controls the drive motor in the unwinding mechanism through a controller, adjusting the output torque of the drive motor in real time according to the changes in the ethylene-vinyl acetate copolymer, thus forming a closed control path, i.e., a control closed loop.

[0069] The specific process of the closed-loop control is as follows: When the inherent properties of the ethylene-vinyl acetate copolymer change, the sensor 40 in the tension detection structure collects and / or processes data related to the tension of the ethylene-vinyl acetate copolymer and converts the physical quantity into an electrical signal, which is then transmitted to the controller. After performing necessary signal processing, the controller outputs a control command to the drive motor. The drive motor adjusts its output torque according to the control command. The sensor 40 then detects the new process variable after the drive motor adjusts its output torque and provides a feedback signal to the controller, thus forming a closed loop.

[0070] Thus far, various embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0071] While specific embodiments of this disclosure have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of this disclosure. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner.

Claims

1. A tension detection structure for ethylene-vinyl acetate copolymer, characterized in that, include: Guide roller (30) extending along a first direction; A linear guide (10) extends along a second direction, and the linear guide (10) and the guide roller (30) are spaced apart in a third direction; Gravity roller (20) extends along a first direction and is movably disposed on the linear guide rail (10). The gravity roller (20) and the guide roller (30) are capable of guiding and conveying ethylene-vinyl acetate copolymer. The first direction, the second direction and the third direction are perpendicular to each other. and Sensor (40) is used to detect the position, speed and acceleration of the gravity roller (20) in real time to allow calculation of the tension of the ethylene-vinyl acetate copolymer.

2. The tension detection structure for ethylene-vinyl acetate copolymer according to claim 1, characterized in that, It also includes a bracket, with both ends of the guide roller (30) disposed on the bracket, and the linear guide rail (10) including a first linear guide rail (11) and a second linear guide rail (12) disposed on the bracket and spaced apart along the first direction, and both ends of the gravity roller (20) respectively disposed on the first linear guide rail (11) and the second linear guide rail (12).

3. The tension detection structure for ethylene-vinyl acetate copolymer according to claim 2, characterized in that, The bracket includes a first support plate (51), a second support plate (52), and a connector (60) connecting the first support plate (51) and the second support plate (52). The first support plate (51) and the second support plate (52) are parallel to each other and both are perpendicular to the extension direction of the connector (60).

4. The tension detection structure for ethylene-vinyl acetate copolymer according to claim 3, characterized in that, The connector (60) consists of four crossbeams.

5. The tension detection structure for ethylene-vinyl acetate copolymer according to claim 2, characterized in that, The guide roller (30) includes a first guide roller (31) and a second guide roller (32). The distance between the first guide roller (31) and the linear guide rail (10) in the third direction is equal to the distance between the linear guide rail (10) and the second guide roller (32) in the third direction. The distance between the first guide roller (31) and the gravity roller (20) in the second direction is equal to the distance between the gravity roller (20) and the second guide roller (32) in the second direction.

6. The tension detection structure for the ethylene-vinyl acetate copolymer according to any one of claims 2-5, characterized in that, The linear guide (10) is provided with an upper limit block (101) and a lower limit block (102) at both ends.

7. The tension detection structure for ethylene-vinyl acetate copolymer according to claim 6, characterized in that, A sensor bracket (401) is fixedly mounted on the bracket, and the sensor bracket (401) is located directly above and / or directly below the linear guide rail (10).

8. The tension detection structure for ethylene-vinyl acetate copolymer according to claim 1, characterized in that, The sensor (40) is a laser sensor.

9. The tension detection structure for ethylene-vinyl acetate copolymer according to claim 8, characterized in that, The linear guide (10) includes a slider with reflective markings, which are used to enhance the detection capability of the laser sensor.

10. A cutting and laying machine, characterized in that, Includes the tension detection structure according to any one of claims 1-9.

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