Photovoltaic film tensile test device and control method thereof

Abstract

The present invention provides a photovoltaic film tensile test device and a control method thereof, comprising a fixing column, a first screw rod, a photovoltaic film fixing device, a motor, a controller and a tension detection device; the controller is used to control the motor to rotate if receiving a test instruction, and drive the photovoltaic film fixing device to move on the first screw rod; the ultrasonic device is used to detect the first tensile state of microfractures or bubbles in the photovoltaic film; the image acquisition device is used to detect the second tensile state of the upper photovoltaic film; the tension detection device is used to detect the first tension of the photovoltaic film from the time of the test instruction to the first tensile state; and detect the second tension from the time of the test instruction to the second tensile state; the controller is also used to determine the tensile strength and elongation of the photovoltaic film according to the first tension, the second tension, the first distance corresponding to the first tensile state and the second distance corresponding to the second tensile state. This technology can improve the test accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of stretching test, and in particular to a photovoltaic film anti-stretching test device and a control method thereof. Background Art

[0002] The tensile test of photovoltaic films is an important method to evaluate their mechanical properties. Through the tensile test, the stress-strain relationship, tensile strength, elongation at break and other mechanical performance indicators of photovoltaic films under tensile conditions are evaluated, providing a basis for the selection and application of materials.

[0003] When the existing photovoltaic film tensile test equipment detects the photovoltaic film, it can only provide data when the photovoltaic film is broken. When the photovoltaic film has microcracks and bubbles, the photovoltaic film loses its original function, causing errors in the data detected by the test equipment.

[0004] In general, the existing photovoltaic film tensile test technology suffers from low test accuracy. Summary of the invention

[0005] The purpose of the present invention is to provide a photovoltaic film tensile test device and a control method thereof, so as to alleviate the technical problem of low test accuracy in the existing photovoltaic film tensile test technology and improve the test accuracy.

[0006] In the first aspect, an embodiment of the present invention provides a photovoltaic film tensile test device, comprising: a plurality of fixed columns arranged on a base, a plurality of first screw rods, an even number of photovoltaic film fixing devices, a motor connected to the above-mentioned photovoltaic film fixing devices, a controller and a tension detection device; the above-mentioned plurality of first screw rods are arranged inside the above-mentioned fixed columns; the above-mentioned photovoltaic film fixing device is connected to the above-mentioned fixed columns and the above-mentioned first screw rods; the first photovoltaic film fixing device and the second photovoltaic film fixing device of each group of photovoltaic film fixing devices are respectively used to fix one end of the photovoltaic film to be tested and the other end of the above-mentioned photovoltaic film to be tested; an ultrasonic device and an image acquisition device are arranged at a preset position away from the above-mentioned photovoltaic film to be tested; the above-mentioned controller is respectively connected to the above-mentioned photovoltaic film fixing device, the motor, the ultrasonic device, the image acquisition device and the tension detection device; the above-mentioned controller is used to control the above-mentioned motor to rotate if a test instruction of the above-mentioned photovoltaic film to be tested is received, so as to drive the above-mentioned photovoltaic film fixing device to move on the above-mentioned first screw rod, to adjust the stretching distance of the photovoltaic film to be tested between the first photovoltaic film fixing device and the second photovoltaic film fixing device; the ultrasonic device is used to detect the first stretching state of micro-fractures or bubbles of preset parameters in the photovoltaic film to be tested; the image acquisition device is used to detect the second stretching state of fracture in the photovoltaic film to be tested; the tension detection device is used to detect the first maximum tension of the photovoltaic film to be tested within the second time from the first time of the test instruction to the first stretching state; and to detect the second maximum tension within the third time from the first time to the second stretching state; the controller is also used to determine the tensile strength and elongation of the photovoltaic film to be tested according to the first maximum tension, the second maximum tension, the first stretching distance corresponding to the first stretching state and the second stretching distance corresponding to the second stretching state.

[0007] In a preferred embodiment of the present invention, the controller is further used to calculate the tensile strength of the photovoltaic film to be tested according to the following formula: Wherein, K is the tensile strength, fc is the first maximum tensile force, fs is the second maximum tensile force, and A is the initial cross-sectional area of ​​the photovoltaic film to be tested.

[0008] In a preferred embodiment of the present invention, the controller is further used to calculate the elongation of the photovoltaic film to be tested according to the following formula:

[0009] Where S is the above elongation, I c is the first stretching length corresponding to the first stretching state, I s is the second stretching length corresponding to the second stretching state, and I0 is the initial length of the photovoltaic film to be tested.

[0010] In a preferred embodiment of the present invention, the number of the above-mentioned fixed columns is two; the number of the above-mentioned first screw rods is two; the above-mentioned first screw rods are connected to the above-mentioned fixed columns through rings; the number of the above-mentioned rings is four groups; two groups of rings out of the four groups are connected to the above-mentioned fixed columns; the other two groups of rings out of the four groups are connected to the threads of the above-mentioned first screw rods.

[0011] In a preferred embodiment of the present invention, a first fixing plate is provided on one side of the base; a supporting column is provided on the first fixing plate; a supporting frame is sleeved on the supporting column; and the ultrasonic device is provided on the supporting frame.

[0012] In a preferred embodiment of the present invention, the ultrasonic device is connected to an ultrasonic probe; the ultrasonic device detects the first stretching state of micro-fractures or bubbles of preset parameters appearing in the photovoltaic film to be tested through the ultrasonic probe.

[0013] In a preferred embodiment of the present invention, a second fixing plate is disposed on the other side of the base; a fixing frame is disposed on the second fixing plate; and the image acquisition device is disposed on the fixing frame.

[0014] In a preferred embodiment of the present invention, a slide groove is provided on the fixing frame; a second screw rod is provided in the slide groove; a sliding block is threadedly connected to the surface of the second screw rod; and the sliding block is connected to the image acquisition device.

[0015] In a preferred embodiment of the present invention, the controller is also used to determine whether the tensile strength and the elongation meet preset standards; if so, output a test pass signal.

[0016] In a second aspect, an embodiment of the present invention further provides a control method for a photovoltaic film tensile test device, which is applied to the photovoltaic film tensile test device; the method comprises: if a test instruction of the photovoltaic film to be tested is received, controlling the motor to rotate, driving the photovoltaic film fixing device to move on the first screw rod, so as to adjust the stretching distance of the photovoltaic film to be tested between the first photovoltaic film fixing device and the second photovoltaic film fixing device; detecting a first stretching state of microfractures or bubbles of preset parameters appearing in the photovoltaic film to be tested by the ultrasonic device; detecting a second stretching state of fractures appearing in the photovoltaic film to be tested by the image acquisition device; detecting a first maximum tension of the photovoltaic film to be tested within a second time from the first time of the test instruction to the first stretching state by the tension detection device; and detecting a second maximum tension within a third time from the first time to the second stretching state; determining the tensile strength and elongation of the photovoltaic film to be tested according to the first maximum tension, the second maximum tension, the first stretching distance corresponding to the first stretching state, and the second stretching distance corresponding to the second stretching state.

[0017] The embodiments of the present invention have the following beneficial technical effects:

[0018] The embodiment of the present invention provides a photovoltaic film tensile test device and a control method thereof, comprising: a plurality of fixing columns arranged on a base, a plurality of first screw rods, an even number of photovoltaic film fixing devices, a motor connected to the above-mentioned photovoltaic film fixing devices, a controller and a tension detection device; the above-mentioned plurality of first screw rods are arranged inside the above-mentioned fixing columns; the above-mentioned photovoltaic film fixing device is connected to the above-mentioned fixing columns and the above-mentioned first screw rods; the first photovoltaic film fixing device and the second photovoltaic film fixing device of each group of photovoltaic film fixing devices are respectively used to fix one end of the photovoltaic film to be tested and the other end of the above-mentioned photovoltaic film to be tested; an ultrasonic device and an image acquisition device are arranged at a preset position away from the above-mentioned photovoltaic film to be tested; the above-mentioned controller is respectively connected to the above-mentioned photovoltaic film fixing device, the motor, the ultrasonic device, the image acquisition device and the tension detection device; the above-mentioned controller is used to control the above-mentioned motor to rotate if a test instruction of the above-mentioned photovoltaic film to be tested is received, so as to drive The photovoltaic film fixing device moves on the first screw rod to adjust the stretching distance of the photovoltaic film to be tested between the first photovoltaic film fixing device and the second photovoltaic film fixing device; the ultrasonic device is used to detect the first stretching state of microfractures or bubbles of preset parameters in the photovoltaic film to be tested; the image acquisition device is used to detect the second stretching state of the photovoltaic film to be tested; the tension detection device is used to detect the first maximum tension of the photovoltaic film to be tested from the first time of the test instruction to the second time of the first stretching state; and detect the second maximum tension in the third time from the first time to the second stretching state; the controller is also used to determine the tensile strength and elongation of the photovoltaic film to be tested according to the first maximum tension, the second maximum tension, the first stretching distance corresponding to the first stretching state, and the second stretching distance corresponding to the second stretching state. This technology accurately controls the movement of the fixing device on the screw rod driven by the motor, combines the ultrasonic and image acquisition devices to monitor the microfractures, bubbles and fracture states in real time, and uses the tension detection device to record the maximum tension at different stretching stages, so as to ensure that the tensile strength and elongation of the photovoltaic film can be accurately measured and improve the test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic structural diagram of a photovoltaic film tensile test device provided by an embodiment of the present invention;

[0021] Figure 2 A schematic structural diagram of another photovoltaic film tensile strength testing device provided by an embodiment of the present invention;

[0022] Figure 3 A schematic structural diagram of a third photovoltaic film tensile strength testing device provided by an embodiment of the present invention;

[0023] Figure 4 A schematic flow chart of a control method for a photovoltaic film tensile strength testing device provided in an embodiment of the present invention.

[0024] Icons: 1-base; 2-fixing column; 3-photovoltaic film fixing device; 4-first screw rod; 5-first fixing plate; 6-support column; 7-ultrasonic equipment; 8-ultrasonic probe; 9-support frame; 10-second fixing plate; 11-fixing frame; 12-second screw rod; 13-slider. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] When testing photovoltaic films, existing photovoltaic film tensile test equipment can only provide data when the photovoltaic film is broken. When the photovoltaic film has microcracks and bubbles, the photovoltaic film loses its original function, causing errors in the data detected by the test equipment. Overall, the existing photovoltaic film tensile test technology has the current status of low test accuracy.

[0027] Based on this, the embodiment of the present invention provides a photovoltaic film tensile test device and a control method thereof. This technology precisely controls the movement of the fixing device on the screw by the motor, combines ultrasonic and image acquisition equipment to monitor microfractures, bubbles and fracture states in real time, and uses a tension detection device to record the maximum tension at different stretching stages, thereby ensuring that the tensile strength and elongation of the photovoltaic film can be accurately measured and the test accuracy can be improved. To facilitate understanding of the embodiment of the present invention, a photovoltaic film tensile test device disclosed in the embodiment of the present invention is first introduced in detail.

[0028] Example 1

[0029] In an embodiment of the present invention, Figure 1 A schematic structural diagram of a photovoltaic film tensile strength testing device provided in an embodiment of the present invention.

[0030] Depend on Figure 1As can be seen, the photovoltaic film tensile test device includes: a plurality of fixed columns 2, a plurality of first screw rods 4, an even number of photovoltaic film fixing devices 3, a motor connected to the above-mentioned photovoltaic film fixing devices 3, a controller and a tension detection device arranged on a base 1; the above-mentioned plurality of first screw rods 4 are arranged on the inner side of the above-mentioned fixed columns 2; the above-mentioned photovoltaic film fixing device 3 is connected to the above-mentioned fixed columns 2 and the above-mentioned first screw rods 4; the first photovoltaic film fixing device and the second photovoltaic film fixing device of each group of photovoltaic film fixing devices 3 are respectively used to fix one end of the photovoltaic film to be tested and the other end of the above-mentioned photovoltaic film to be tested; an ultrasonic device 7 and an image acquisition device are arranged at a preset position away from the above-mentioned photovoltaic film to be tested; the above-mentioned controller is respectively connected to the above-mentioned photovoltaic film fixing device, the motor, the ultrasonic device 7, the image acquisition device and the tension detection device; the above-mentioned controller is used to control the above-mentioned motor to rotate if a test instruction of the above-mentioned photovoltaic film to be tested is received, so as to drive the above-mentioned photovoltaic film to be tested. The photovoltaic film fixing device 3 moves on the first screw rod 4 to adjust the stretching distance of the photovoltaic film to be tested between the first photovoltaic film fixing device and the second photovoltaic film fixing device; the ultrasonic device is used to detect the first stretching state of micro-fractures or bubbles of preset parameters in the photovoltaic film to be tested; the image acquisition device is used to detect the second stretching state of fracture in the photovoltaic film to be tested; the tension detection device is used to detect the first maximum tension of the photovoltaic film to be tested within the second time from the first time of the test instruction to the first stretching state; and detect the second maximum tension within the third time from the first time to the second stretching state; the controller is also used to determine the tensile strength and elongation of the photovoltaic film to be tested according to the first maximum tension, the second maximum tension, the first stretching distance corresponding to the first stretching state and the second stretching distance corresponding to the second stretching state.

[0031] In an embodiment of the present invention, the controller is further used to calculate the tensile strength of the photovoltaic film to be tested according to the following formula:

[0032]

[0033] Where K is the tensile strength, f c is the first maximum tension mentioned above, f s is the second maximum tensile force mentioned above, and A is the initial cross-sectional area of ​​the photovoltaic film to be tested.

[0034] In this embodiment, the initial cross-sectional area of ​​the photovoltaic film to be tested is the cross-sectional area of ​​the photovoltaic film to be tested before the first time, that is, the photovoltaic film to be tested is not stretched at this time.

[0035] Furthermore, the controller is also used to calculate the elongation of the photovoltaic film to be tested according to the following formula:

[0036]

[0037] Where S is the above elongation, I c is the first stretching length corresponding to the first stretching state, I s is the second stretching length corresponding to the second stretching state, and I0 is the initial length of the photovoltaic film to be tested.

[0038] In this embodiment, the initial length of the photovoltaic film to be tested is the length of the photovoltaic film to be tested before the first time, that is, the photovoltaic film to be tested is not stretched at this time.

[0039] In actual operation, there are two fixed columns 2; there are two first screw rods 4; the first screw rod 4 is connected to the fixed column 2 through a ring; there are four groups of rings; two of the four groups of rings are connected to the fixed column 2; the other two of the four groups of rings are connected to the threads of the first screw rod 4.

[0040] For ease of understanding, Figure 2 A schematic structural diagram of another photovoltaic film tensile strength testing device provided in an embodiment of the present invention.

[0041] Depend on Figure 2 As can be seen, a first fixing plate 5 is provided on one side of the base 1 ; a supporting column 6 is provided on the first fixing plate 5 ; a supporting frame 9 is sleeved on the supporting column 6 ; and the ultrasonic device 7 is provided on the supporting frame 9 .

[0042] Specifically, the ultrasonic device 7 is connected to an ultrasonic probe 8; the ultrasonic device 7 detects the first stretching state of micro-fractures or bubbles of preset parameters appearing in the photovoltaic film to be tested through the ultrasonic probe 8.

[0043] Furthermore, Figure 3 A schematic structural diagram of a third photovoltaic film tensile strength testing device provided in an embodiment of the present invention.

[0044] Depend on Figure 3 As can be seen, a second fixing plate 10 is disposed on the other side of the base 1 ; a fixing frame 11 is disposed on the second fixing plate 10 ; and the image acquisition device is disposed on the fixing frame 11 .

[0045] Furthermore, a slide groove is provided on the fixing frame 11; a second screw rod 12 is provided in the slide groove; a sliding block 13 is threadedly connected to the surface of the second screw rod 12; and the sliding block 13 is connected to the image acquisition device.

[0046] Furthermore, the controller is also used to determine whether the tensile strength and the elongation meet preset standards; if so, output a test pass signal.

[0047] The embodiment of the present invention provides a photovoltaic film tensile test device, comprising: a plurality of fixing columns arranged on a base, a plurality of first screw rods, an even number of photovoltaic film fixing devices, a motor connected to the above-mentioned photovoltaic film fixing devices, a controller and a tension detection device; the above-mentioned plurality of first screw rods are arranged inside the above-mentioned fixing columns; the above-mentioned photovoltaic film fixing device is connected to the above-mentioned fixing columns and the above-mentioned first screw rods; the first photovoltaic film fixing device and the second photovoltaic film fixing device of each group of photovoltaic film fixing devices are respectively used to fix one end of the photovoltaic film to be tested and the other end of the above-mentioned photovoltaic film to be tested; an ultrasonic device and an image acquisition device are arranged at a preset position away from the above-mentioned photovoltaic film to be tested; the above-mentioned controller is respectively connected to the above-mentioned photovoltaic film fixing device, the motor, the ultrasonic device, the image acquisition device and the tension detection device; the above-mentioned controller is used to control the above-mentioned motor to rotate if a test instruction of the above-mentioned photovoltaic film to be tested is received, so as to drive the above-mentioned light The photovoltaic film fixing device moves on the first screw rod to adjust the stretching distance of the photovoltaic film to be tested between the first photovoltaic film fixing device and the second photovoltaic film fixing device; the ultrasonic device is used to detect the first stretching state of microfractures or bubbles of preset parameters in the photovoltaic film to be tested; the image acquisition device is used to detect the second stretching state of the photovoltaic film to be tested; the tension detection device is used to detect the first maximum tension of the photovoltaic film to be tested from the first time of the test instruction to the second time of the first stretching state; and detect the second maximum tension in the third time from the first time to the second stretching state; the controller is also used to determine the tensile strength and elongation of the photovoltaic film to be tested according to the first maximum tension, the second maximum tension, the first stretching distance corresponding to the first stretching state, and the second stretching distance corresponding to the second stretching state. This technology precisely controls the movement of the fixing device on the screw rod driven by the motor, combines the ultrasonic and image acquisition devices to monitor the microfractures, bubbles and fracture states in real time, and uses the tension detection device to record the maximum tension at different stretching stages, so as to ensure that the tensile strength and elongation of the photovoltaic film can be accurately measured and improve the test accuracy.

[0048] Example 2

[0049] Based on the above embodiments, Figure 4 A schematic flow chart of a control method for a photovoltaic film tensile strength testing device provided in an embodiment of the present invention.

[0050] Among them, the control method of the photovoltaic film tensile test device is applied to the photovoltaic film tensile test device of the above embodiment.

[0051] Depend on Figure 4 As can be seen, the method includes:

[0052] Step S101: If a test instruction of the photovoltaic film to be tested is received, the motor is controlled to rotate to drive the photovoltaic film fixing device to move on the first screw rod to adjust the stretching distance of the photovoltaic film to be tested between the first photovoltaic film fixing device and the second photovoltaic film fixing device.

[0053] Step S102: using the ultrasonic device to detect the first stretching state of micro fractures or bubbles of preset parameters in the photovoltaic film to be tested.

[0054] Step S103: Detecting the second tensile state in which the photovoltaic film to be tested is broken by the image acquisition device.

[0055] Step S104: Detecting the first maximum tension of the photovoltaic film to be tested within a second period from the first time of the test instruction to the first tensile state through the tension detection device; and detecting the second maximum tension within a third period from the first time to the second tensile state.

[0056] Step S105: determining the tensile strength and elongation of the photovoltaic film to be tested according to the first maximum tensile force, the second maximum tensile force, the first stretching distance corresponding to the first stretching state, and the second stretching distance corresponding to the second stretching state.

[0057] An embodiment of the present invention provides a control method for a photovoltaic film tensile test device, and its implementation principle and technical effects are the same as those of the aforementioned photovoltaic film tensile test device embodiment. For the sake of brief description, for parts not mentioned in the embodiment of the control method of the aforementioned photovoltaic film tensile test device, reference may be made to the corresponding contents in the aforementioned photovoltaic film tensile test device embodiment.

[0058] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0059] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0061] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the aforementioned embodiments, those of ordinary skill in the art should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed by the present invention, or can easily conceive of changes, or make equivalent replacements for some of the technical features therein. Such modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the protection scope of the present invention.

Claims

1. A photovoltaic film tensile test device, characterized in that: include: A plurality of fixing columns, a plurality of first screw rods, an even number of photovoltaic film fixing devices, a motor connected to the photovoltaic film fixing devices, a controller and a tension detection device are arranged on the base; the plurality of first screw rods are arranged inside the fixing columns; the photovoltaic film fixing devices are connected to the fixing columns and the first screw rods; the first photovoltaic film fixing device and the second photovoltaic film fixing device of each group of photovoltaic film fixing devices are respectively used to fix one end of the photovoltaic film to be tested and the other end of the photovoltaic film to be tested; an ultrasonic device and an image acquisition device are arranged at a preset position away from the photovoltaic film to be tested; the controller is respectively connected to the photovoltaic film fixing device, the motor, the ultrasonic device, the image acquisition device and the tension detection device; The controller is used to control the motor to rotate if receiving a test instruction of the photovoltaic film to be tested, so as to drive the photovoltaic film fixing device to move on the first screw rod, so as to adjust the stretching distance of the photovoltaic film to be tested between the first photovoltaic film fixing device and the second photovoltaic film fixing device; The ultrasonic device is used to detect the first stretching state of micro fractures or bubbles of preset parameters appearing in the photovoltaic film to be tested; The image acquisition device is used to detect the second stretching state in which the photovoltaic film to be tested is broken; The tension detection device is used to detect the first maximum tension of the photovoltaic film to be tested within the second time from the first time of the test instruction to the first stretching state; and to detect the second maximum tension within the third time from the first time to the second stretching state; The controller is further used to determine the tensile strength and elongation of the photovoltaic film to be tested according to the first maximum tensile force, the second maximum tensile force, a first stretching distance corresponding to the first stretching state, and a second stretching distance corresponding to the second stretching state.

2. The photovoltaic film tensile test device according to claim 1, characterized in that: The controller is also used to calculate the tensile strength of the photovoltaic film to be tested according to the following formula: Wherein, K is the tensile strength, f c is the first maximum tension, f s is the second maximum tensile force, and A is the initial cross-sectional area of ​​the photovoltaic film to be tested.

3. The photovoltaic film tensile test device according to claim 2, characterized in that: The controller is also used to calculate the elongation of the photovoltaic film to be tested according to the following formula: Wherein, S is the elongation, I c is the first stretching length corresponding to the first stretching state, I s is the second stretched length corresponding to the second stretched state, and I0 is the initial length of the photovoltaic film to be tested.

4. The photovoltaic film tensile test device according to claim 1, characterized in that: The number of the fixed columns is two; the number of the first screw rods is two; the first screw rod is connected to the fixed column via a ring; the number of the rings is four groups; two groups of the four groups of rings are sleeved on the fixed column; the other two groups of the four groups of rings are sleeved on the threads of the first screw rod.

5. The photovoltaic film tensile test device according to claim 1, characterized in that: A first fixing plate is arranged on one side of the base; a supporting column is arranged on the first fixing plate; a supporting frame is sleeved on the supporting column; and the ultrasonic device is arranged on the supporting frame.

6. The photovoltaic film tensile test device according to claim 5, characterized in that: The ultrasonic device is connected to an ultrasonic probe; the ultrasonic device detects the first stretching state of micro fractures or bubbles of preset parameters appearing in the photovoltaic film to be tested through the ultrasonic probe.

7. The photovoltaic film tensile test device according to claim 1, characterized in that: A second fixing plate is arranged on the other side of the base; a fixing frame is arranged on the second fixing plate; and the image acquisition device is arranged on the fixing frame.

8. The photovoltaic film tensile test device according to claim 7, characterized in that: The fixing frame is provided with a slide groove; a second screw rod is provided in the slide groove; a sliding block is threadedly connected to the surface of the second screw rod; and the sliding block is connected to the image acquisition device.

9. The photovoltaic film tensile test device according to claim 1, characterized in that: The controller is also used to determine whether the tensile strength and the elongation meet preset standards; If it meets the requirements, a test pass signal is output.

10. A control method for a photovoltaic film tensile test device, characterized in that: The photovoltaic film tensile test device according to any one of claims 1 to 9 is applied; the method comprises: If a test instruction of the photovoltaic film to be tested is received, the motor is controlled to rotate to drive the photovoltaic film fixing device to move on the first screw rod to adjust the stretching distance of the photovoltaic film to be tested between the first photovoltaic film fixing device and the second photovoltaic film fixing device; Detecting the first stretching state of micro fractures or bubbles of preset parameters appearing in the photovoltaic film to be tested by the ultrasonic device; Detecting, by means of the image acquisition device, a second tensile state in which the photovoltaic film to be tested is broken; The tension detection device detects the first maximum tension of the photovoltaic film to be tested within the second time from the first time of the test instruction to the first stretching state; and detects the second maximum tension within the third time from the first time to the second stretching state; The tensile strength and elongation of the photovoltaic adhesive film to be tested are determined according to the first maximum tensile force, the second maximum tensile force, a first stretching distance corresponding to the first stretching state, and a second stretching distance corresponding to the second stretching state.

Images