Device and method for detecting light transmission uniformity of agricultural plastic greenhouse film

Abstract

The invention relates to the technical field of detection devices, and discloses an agricultural plastic greenhouse film light transmission uniformity detection device and method.The agricultural plastic greenhouse film light transmission uniformity detection device comprises a detector body and a detection head, the detector body is used for bearing and installing all parts, and the detection head is fixedly installed on the upper surface of the detector body and used for emitting detection light. A rod body is manually poked to drive a rotating disc to rotate, a driving groove is driven by the rotating disc to rotate, the driving groove is matched with a driving column to drive a sliding block to slide along a groove opening, and when the sliding block moves away from the circle center of a circular ring, a plastic greenhouse film is attached to the upper surface of the sliding block; the sliding blocks drive the peripheral edge of the plastic greenhouse film to be unfolded in the direction away from the circle center of the circular ring, so that the plastic greenhouse film is straightened and unfolded, and data is more accurate when light transmittance detection is conducted on the plastic greenhouse film subsequently.

Description

Technical Field

[0001] The present invention relates to the technical field of detection devices, and particularly relates to a detection device and method for the light transmittance uniformity of agricultural plastic greenhouse films. Background Art

[0002] Agricultural films, also known as agricultural plastic films, the detection of the light transmittance of agricultural plastic films is an important step to ensure their effective use in agricultural production. The light transmittance directly affects the photosynthesis and growth and development of plants, so accurate measurement and control are required.

[0003] When detecting the light transmittance of agricultural films, a batch of agricultural film samples need to be prepared in advance. When detecting the agricultural film samples, the flatness and cleanliness of the samples need to be ensured. Since the agricultural film samples have elasticity, local bending or even creases may occur in the agricultural film samples during detection. The bending of the agricultural film samples will cause uneven thickness distribution on the surface of the agricultural film, resulting in differences in the light transmittance in different regions, which will affect the accuracy of measuring the light transmittance of the agricultural film. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies existing in the prior art, and to propose a detection device and method for the light transmittance uniformity of agricultural plastic greenhouse films.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions: A detection device for the light transmittance uniformity of agricultural plastic greenhouse films, comprising: A detector body for carrying and installing various components; A detection head fixedly installed on the upper surface of the detector body for emitting detection light; A receiving base disposed on the upper surface of the detector body and directly below the detection head for receiving the detection light emitted by the detection head; A circular ring disposed inside the receiving base, with an agricultural plastic greenhouse film disposed on the top of the circular ring; A pressing ring disposed on the upper surface of the agricultural plastic greenhouse film for pressing the agricultural plastic greenhouse film on the top of the circular ring to limit its position. The pressing ring is made of iron material and can be attracted by a magnet; An unfolding unit for flattening the agricultural plastic greenhouse film between the circular ring and the pressing ring. The unfolding unit is disposed inside the circular ring and is used in cooperation with the pressing ring.

[0006] As a further solution of the present invention, a circular groove is formed inside the receiving base, the ring is arranged inside the circular groove, and a rubber pad is arranged between the bottom end of the ring and the bottom of the circular groove. The rubber pad ensures that there is no gap between the bottom end of the ring and the bottom of the circular groove. A plurality of protrusions are arranged on the circumferential outer surface of the ring, and a plurality of grooves matching the protrusions are formed on the inner wall of the circular groove. The protrusions are arranged inside the grooves to limit the rotation of the ring in the circular groove.

[0007] As a further solution of the present invention, the unfolding unit includes: A plurality of sliders. A plurality of notches are equidistantly formed in the circumferential direction on the upper surface of the ring, and the plurality of sliders are respectively arranged inside the plurality of notches and are slidably installed on their inner walls; A plurality of magnet sheets. The plurality of magnet sheets are respectively arranged on the upper surfaces of the plurality of sliders, and the magnet sheets are embedded inside the sliders. By means of the adsorption of the plurality of magnet sheets on the iron pressing ring, the pressing ring presses the plastic shed film on the upper surfaces of the plurality of sliders; A turntable. A sunk groove is formed on the lower surface of the ring, the turntable is rotatably installed inside the sunk groove, a plurality of driving grooves are equidistantly formed on the upper surface of the turntable, the center lines of the driving grooves coincide with the radius of the turntable, and driving columns are fixedly installed on the lower surfaces of the plurality of sliders. The driving columns are arranged inside the driving grooves and are slidably installed on their inner walls. By driving the rotation of the driving grooves by the turntable, the driving grooves drive the sliders to slide along the notches through the cooperation with the driving columns.

[0008] As a further solution of the present invention, a plurality of rod bodies are fixedly installed on the circumferential outer surface of the turntable, a plurality of first grooves are formed on the circumferential outer surface of the ring, the plurality of rod bodies respectively penetrate through the plurality of first grooves and are slidably installed on their inner walls, and a plurality of fixing blocks are fixedly installed on the upper surface of the receiving base. Second grooves are formed on the outer surfaces of the plurality of fixing blocks, and the rod bodies are arranged inside the second grooves and are slidably installed on their inner walls.

[0009] As a further solution of the present invention, a first cavity is formed inside the receiving base, a circular hole is formed inside the ring, the circular hole is communicated with the first cavity to form a second cavity, the plurality of notches and the upper surface of the turntable form a plurality of third cavities, a plurality of air holes are equidistantly formed on the inner wall of the circular hole, the plurality of air holes are respectively communicated with the plurality of third cavities, an air passage is formed inside the slider, the air passage is arranged in an L shape, and one end port of the air passage is flush with the inner wall of the notch.

[0010] As a further solution of the present invention, a plurality of openings are equidistantly formed on the circumferential outer surface of the ring, and the plurality of openings are respectively communicated with the interiors of the plurality of third cavities.

[0011] As a further solution of the present invention, the upper surface of the magnet sheet is lower than the upper surface of the slider, ensuring that the plastic greenhouse film is in complete contact with the upper surface of the slider, and the roughness of the upper surface of the slider and the lower surface of the pressure ring is between Ra0.2μm-Ra0.4μm.

[0012] A method for using a device for detecting light transmittance uniformity of agricultural plastic greenhouse film comprises the following steps: S1: When testing the light transmittance of the plastic greenhouse film, the plastic greenhouse film is manually placed between the pressure ring and the slider by the user; S2: The user can put the ring directly into the circular groove of the receiving base. Since the receiving base is fixedly set directly below the detection head, the plastic film on the ring is located directly below the detection head. S3: The rod body is manually toggled to drive the turntable to rotate, and the turntable drives the driving slot to rotate. The driving slot drives the slider to slide along the slot by cooperating with the driving column. When the slider moves away from the center of the ring, because the plastic greenhouse film is attached to the upper surface of the slider, the slider drives the edges of the plastic greenhouse film to expand in the direction away from the center of the ring, thereby straightening and expanding the plastic greenhouse film. S4: The detection head emits a certain intensity of detection light, which passes through the plastic greenhouse film and is then received by the receiving base. By comparing the attenuation of the detection light before and after, the transmittance of the plastic greenhouse film can be measured.

[0013] The present application manually drives the turntable to rotate by toggling the rod body, and the turntable drives the driving slot to rotate. The driving slot drives the slider to slide along the slot by cooperating with the driving column. When the slider moves away from the center of the ring, because the plastic greenhouse film is in contact with the upper surface of the slider, the slider will drive the edges of the plastic greenhouse film to expand in the direction away from the center of the ring, thereby straightening and unfolding the plastic greenhouse film, so that the data will be more accurate when the transmittance of the plastic greenhouse film is subsequently tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of a device for detecting light transmittance uniformity of agricultural plastic greenhouse film proposed by the present invention; Figure 2 A schematic diagram of a receiving base of a device for detecting light transmittance uniformity of agricultural plastic greenhouse film proposed by the present invention; Figure 3 A schematic diagram of a fixing block of a device for detecting light transmittance uniformity of agricultural plastic greenhouse film proposed by the present invention; Figure 4 This is a schematic diagram of the exploded structure of a device for detecting light transmittance uniformity of agricultural plastic greenhouse film proposed by the present invention; Figure 5 A cross-sectional schematic diagram of a receiving base of a device for detecting light transmittance uniformity of agricultural plastic greenhouse film proposed by the present invention; Figure 6 Schematic diagram of a circular ring of a device for detecting the light transmittance uniformity of an agricultural plastic greenhouse film proposed by the present invention; Figure 7 Schematic diagram of the structure of a device for detecting the light transmittance uniformity of an agricultural plastic greenhouse film proposed by the present invention; Figure 8 Schematic diagram of the position switching of the third cavity of a device for detecting the light transmittance uniformity of an agricultural plastic greenhouse film proposed by the present invention; Figure 9 Schematic diagram of the third cavity of a device for detecting the light transmittance uniformity of an agricultural plastic greenhouse film proposed by the present invention during air suction; Figure 10 Schematic diagram of a turntable of a device for detecting the light transmittance uniformity of an agricultural plastic greenhouse film proposed by the present invention; Figure 11 Schematic diagram of a slider of a device for detecting the light transmittance uniformity of an agricultural plastic greenhouse film proposed by the present invention.

[0015] In the figure: 1, detector body; 2, detection head; 3, receiving base; 301, groove; 4, plastic greenhouse film; 5, pressure ring; 6, circular ring; 601, protrusion; 602, opening; 603, notch; 604, air hole; 605, sink; 606, first groove; 7, turntable; 701, driving groove; 702, rod body; 8, fixing block; 801, second groove; 9, slider; 901, air duct; 10, magnet sheet; 11, driving column; 12, rubber pad. Detailed implementation manners

[0016] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0017] As Figure 1 , Figure 2 and Figure 3 shown, a device for detecting the light transmittance uniformity of an agricultural plastic greenhouse film includes: a detector body 1 for carrying and installing various components, a detection head 2 for emitting detection light, a receiving base 3 for receiving the detection light emitted by the detection head 2, a circular ring 6 for placing the plastic greenhouse film 4, a pressure ring 5 for pressing the top of the plastic greenhouse film 4 on the circular ring 6 and restricting its position, and a spreading unit for flattening the plastic greenhouse film 4 between the circular ring 6 and the pressure ring 5.

[0018] As Figure 1As shown in the figure, the detection head 2 is fixedly installed on the upper surface of the detector body 1, and the receiving base 3 is arranged on the upper surface of the detector body 1 and directly below the detection head 2. The detection head 2 emits detection light of a certain intensity. The detection light passes through the plastic greenhouse film 4 and then is received by the receiving base 3. By comparing the attenuation of the detection light before and after, the light transmittance of the plastic greenhouse film 4 can be measured.

[0019] As Figure 2 shown in the figure, a circular ring 6 is arranged inside the receiving base 3. The plastic greenhouse film 4 is arranged at the top of the circular ring 6. A pressing ring 5 is arranged on the upper surface of the plastic greenhouse film 4. The pressing ring 5 is made of iron material and can be attracted by a magnet. Both the circular ring 6 and the pressing ring 5 are arranged in a ring shape, which allows the detection light to pass through their middle positions. Since the plastic greenhouse film 4 is very thin and light and is easily blown away by the wind, the plastic greenhouse film 4 is pressed on the top of the circular ring 6 through the pressing ring 5, preventing the plastic greenhouse film 4 from slipping and facilitating the detection of its light transmittance.

[0020] Because in reality, when detecting the light transmittance of the plastic greenhouse film 4, in order to ensure the accuracy of the detection data, it is necessary to detect multiple samples in batches. And when detecting the light transmittance of the plastic greenhouse film 4, it is necessary to ensure that the plastic greenhouse film 4 is directly below the detection head 2 without any deviation in position. In order to quickly align the position of the plastic greenhouse film 4, as Figure 4 and Figure 5 shown in the figure, in this embodiment, a circular groove is opened inside the receiving base 3, and the circular ring 6 is arranged inside the circular groove. Through the cooperation of the circular groove and the circular ring 6, the user can directly place the circular ring 6 into the circular groove of the receiving base 3. Since the receiving base 3 is fixedly arranged directly below the detection head 2, the plastic greenhouse film 4 on the circular ring 6 is directly below the detection head 2. Through this device, the plastic greenhouse film 4 can be quickly positioned, and at the same time, its position deviation is avoided.

[0021] Since the plastic greenhouse film 4 has elasticity, during the detection process, its local part may bend or produce creases, resulting in uneven surface thickness distribution, and further affecting the regional difference in light transmittance. In order to ensure that the surface of the plastic greenhouse film 4 is fully unfolded and straightened during detection, as Figure 2 and Figure 3 shown in the figure, in this embodiment, an unfolding unit is arranged inside the circular ring 6. By using the unfolding unit in cooperation with the pressing ring 5, the plastic greenhouse film 4 between the top of the circular ring 6 and the pressing ring 5 is fully straightened and unfolded. The unfolding unit includes: as Figure 3 shown, several sliders 9 for carrying the plastic greenhouse film 4, several magnet sheets 10 for attracting the iron - made pressing ring 5, and as Figure 6 shown, a turntable 7 for driving several sliders 9 to move.

[0022] As Figure 3As shown, a number of notches 603 are equidistantly arranged in the circumferential direction on the upper surface of the circular ring 6. A number of sliders 9 are respectively arranged inside the a number of notches 603 and are slidably installed on their inner walls. The upper surfaces of the a number of sliders 9 are flush with the upper surface of the circular ring 6, which can ensure that the plastic greenhouse film 4 can be laid flat completely. As Figure 6 shown, a sunk groove 605 is arranged on the lower surface of the circular ring 6. The turntable 7 is rotatably installed inside the sunk groove 605. A number of driving grooves 701 are equidistantly arranged on the upper surface of the turntable 7. As Figure 11 shown, driving columns 11 are fixedly installed on the lower surfaces of the a number of sliders 9. The driving columns 11 are arranged inside the driving grooves 701 and are slidably installed on their inner walls. By driving the rotation of the driving grooves 701 through the turntable 7, the driving grooves 701 drive the sliders 9 to slide along the notches 603 through cooperation with the driving columns 11. There are two directions for the sliders 9 to slide. One is to move towards the center of the circular ring 6, and the other is to move away from the center of the circular ring 6. The a number of sliders 9 are evenly distributed on the upper surface of the circular ring 6, ensuring that when the plastic greenhouse film 4 is subsequently straightened and unfolded, the pulling force of the sliders 9 on it is multi-directional and uniform. And there is an overlapping distance at the head and tail between two adjacent sliders 9, so that when the sliders 9 straighten and unfold the plastic greenhouse film 4, the surface of the plastic greenhouse film 4 is uniformly stressed, avoiding the phenomenon of wrinkles or unevenness in the area where the plastic greenhouse film 4 is not stressed.

[0023] As Figure 10 shown, the center line of the driving groove 701 coincides with the radius of the turntable 7. As Figure 7 shown, the center line of the notch 603 has a certain included angle with the radius of the circular ring 6. Through this setting, it is ensured that the driving groove 701 can correctly drive the slider 9 to move through the driving column 11.

[0024] As Figure 2 and Figure 3 shown, a number of magnet sheets 10 are respectively arranged on the upper surfaces of the a number of sliders 9. Because the pressing ring 5 is made of iron material, it will be adsorbed by the a number of magnet sheets 10, so as to press the plastic greenhouse film 4 between the pressing ring 5 and the slider 9, so that the plastic greenhouse film 4 is at the top of the circular ring 6. The magnet sheets 10 are embedded inside the sliders 9. The upper surface of the magnet sheets 10 is lower than the upper surface of the sliders 9, ensuring that the plastic greenhouse film 4 is in full contact with the upper surface of the sliders 9. When the slider 9 slides away from the center of the circular ring 6, because the plastic greenhouse film 4 is in contact with the upper surface of the slider 9, the slider 9 will drive the four edges of the plastic greenhouse film 4 to unfold in the direction away from the center of the circular ring 6, so as to straighten and unfold the plastic greenhouse film 4.

[0025] The roughness of the upper surface of the slider 9 and the lower surface of the pressure ring 5 is between Ra0.2μm and Ra0.4μm. By setting the roughness, the plastic greenhouse film 4 can be relatively displaced between the upper surface of the slider 9 and the lower surface of the pressure ring 5. When the plastic greenhouse film 4 has been straightened, if the slider 9 is still moving, it will not excessively pull the plastic greenhouse film 4 to prevent it from being broken or deformed and thinned. Because the sliders 9 are evenly distributed on the upper surface of the ring 6, the magnet pieces 10 are also evenly distributed on the lower surface of the pressure ring 5, so that the magnetic adsorption force on the pressure ring 5 is also evenly distributed around the pressure ring 5. At this time, when the magnet pieces 10 move with the slider 9, the friction force on the pressure ring 5 comes from the relative movement between the pressure ring 5 and the plastic greenhouse film 4, and the friction force is constant and uniform. Therefore, the position of the pressure ring 5 remains stable and will not shift, thereby ensuring the clamping effect on the plastic greenhouse film 4.

[0026] In order to facilitate the user to rotate the turntable 7, in this embodiment, Figure 4 and Figure 5 As shown, a plurality of rod bodies 702 are fixedly installed on the circumferential outer surface of the turntable 7, a plurality of first grooves 606 are provided on the circumferential outer surface of the ring 6, and a plurality of rod bodies 702 respectively penetrate the plurality of first grooves 606 and are slidably installed on the inner wall thereof. When the user needs to unfold the plastic shed film 4, the rod body 702 is manually moved to drive the turntable 7 to rotate, and the movement range of the rod body 702 is limited by the first groove 606. A plurality of protrusions 601 are provided on the circumferential outer surface of the ring 6, and a plurality of grooves 301 matching the protrusions 601 are provided on the inner wall of the circular groove of the receiving base 3. The protrusions 601 are arranged inside the grooves 301 to limit the ring 6 from rotating in the circular groove, so that when the rod body 702 is moved again, the ring 6 cannot rotate relative to the receiving base 3, thereby ensuring that the turntable 7 can rotate correctly.

[0027] In order to limit the up and down movement of the ring 6, in this embodiment, Figure 3 and Figure 4As shown, a plurality of fixing blocks 8 are fixedly installed on the upper surface of the receiving base 3, and a second groove 801 is opened on the outer surface of the plurality of fixing blocks 8. The second groove 801 is L-shaped, and the rod body 702 is arranged inside the second groove 801 and slidably installed with the inner wall thereof. When the rod body 702 is manually moved to drive the turntable 7 to rotate in order to unfold the plastic shed film 4, the user moves the rod body 702 to the end of the second groove 801. At this time, the rod body 702 is restricted in the axial direction of the ring 6, so that the ring 6 is restricted from moving in its axial direction to avoid affecting the It affects the subsequent transmittance detection of the plastic greenhouse film 4, and a rubber pad 12 is arranged between the bottom end of the ring 6 and the bottom of the circular groove of the receiving base 3. Due to the elastic force of the rubber pad 12, the rod body 702 can be against the top wall of the second groove 801 when it is inside the second groove 801, and then the rod body 702 is subjected to the friction force of the inner wall of the second groove 801 through the reaction force. This arrangement further limits the movement of the rod body 702. When the rod body 702 is moved, because its outer surface is arranged in a circular arc, it can slide along the inner wall of the second groove 801 by applying force.

[0028] When detecting the transmittance of the plastic greenhouse film 4, the plastic greenhouse film 4 is manually placed between the pressure ring 5 and the slider 9 by the user. Since the plastic greenhouse film 4 is thin and soft, if the user does not place it flat, the local area of the plastic greenhouse film 4 between the pressure ring 5 and the outer surface of the slider 9 may be folded, causing the part to become thicker. At this time, the distance between the pressure ring 5 and the magnet sheet 10 increases, and the magnetic attraction is weakened, thereby reducing the pressure of the pressure ring 5 on the part. In the subsequent straightening and unfolding process, the part is easily pulled, causing the plastic greenhouse film 4 to shift at the top of the ring 6, thereby generating uneven tension and forming more wrinkles, affecting the detection of the transmittance of the plastic greenhouse film 4. In this embodiment, Figure 5 and Figure 6 As shown, a first cavity is opened inside the receiving base 3, and a circular hole is opened inside the circular ring 6. The circular hole is connected with the first cavity to form a second cavity. The rubber pad 12 is used to prevent a gap between the bottom end of the circular ring 6 and the bottom of the circular groove of the receiving base 3, so that the second cavity formed between the circular ring 6 and the receiving base 3 will not leak. Figure 7 As shown, a plurality of notches 603 form a plurality of third cavities with the upper surface of the turntable 7. The third cavity is specifically formed by the upper surface of the turntable 7 being flush with the top wall of the sink 605, and the upper surface of the turntable 7 being flush with the lower surface of the slider 9, so that the bottom of the notch 603 is sealed to form a third cavity, as shown in FIG. Figure 7 As shown, the slider 9 and the inner wall of the slot 603 are flat, the slider 9 slides inside the third cavity, and the position of the third cavity is in the switching position through the sliding of the slider 9, as shown in FIG. Figure 6As shown, a number of air holes 604 are equidistantly arranged on the inner wall of the inner circular hole of the circular ring 6. The number of air holes 604 are respectively communicated with a number of third cavities. An air passage 901 is arranged inside the slider 9. The air passage 901 is arranged in an L shape. One end port of the air passage 901 is flush with the inner wall of the notch 603 to seal the air passage 901.

[0029] When the plastic greenhouse film 4 covers the top of the circular ring 6, since the upper surface of the slider 9 is flush with the outer surface of the top of the circular ring 6, the plastic greenhouse film 4 is pressed on the upper surfaces of the slider 9 and the circular ring 6 under the cooperation of the pressing ring 5 and the magnet sheet 10. At this time, the second cavity and the third cavity are completely covered by the plastic greenhouse film 4. When the turntable 7 is rotated to straighten and unfold the plastic greenhouse film 4, the slider 9 moves away from the center of the circular ring 6 inside the third cavity. At this time, the third cavity is gradually formed at one end of the notch 603 close to the center of the circular ring 6. Because of the formation of the third cavity, the second cavity forms a negative pressure space through the air holes 604. This negative pressure increases with the increase of the third cavity. At this time, the plastic greenhouse film 4 located in the second cavity is sucked because of the negative pressure and is gradually sucked more firmly as the negative pressure increases. Because the middle position of the plastic greenhouse film 4 is sucked, when the slider 9 straightens and unfolds the plastic greenhouse film 4, it will first slowly tear apart the folded plastic greenhouse film 4 between the pressing ring 5 and the outer surface of the slider 9 to avoid the position of the plastic greenhouse film 4 shifting or being pulled to form more wrinkles when the plastic greenhouse film 4 is continuously unfolded later. Since the negative pressure in the second cavity gradually increases, the force sucking the plastic greenhouse film 4 also gradually increases. Therefore, when pulling the plastic greenhouse film 4 at the beginning, the position of the plastic greenhouse film 4 can be straightened first, and then the position of the plastic greenhouse film 4 can be fixed by the increasing suction force so that the surrounding film can be straightened and unfolded.

[0030] Because of the negative pressure in the second cavity, the middle position of the plastic greenhouse film 4 sinks downward, so the plastic greenhouse film 4 at the middle position becomes thinner due to elastic deformation, which affects the accuracy of the transparency detection. In this embodiment, as Figure 8 and Figure 9 shown, a number of openings 602 are equidistantly arranged on the outer circumferential surface of the circular ring 6. The number of openings 602 are respectively communicated with the inside of a number of third cavities. When one end port of the air passage 901 inside the slider 9 moves to the position of the opening 602, the third cavity is communicated with the outside through the air passage 901 and the opening 602. At this time, the outside air enters the inside of the second cavity to make the air pressure inside it return to balance. At this time, the film of the plastic greenhouse film 4 deformed by the negative pressure in the middle position of the second cavity will return to its original state. To ensure that the restored plastic greenhouse film 4 can be flattened, at this time, the turntable 7 is continuously rotated so that the slider 9 slides outward for a certain distance to completely flatten the plastic greenhouse film 4. Through this device, the plastic greenhouse film 4 can be completely flattened, making the data more accurate when detecting the light transmittance of the plastic greenhouse film 4 later.

[0031] A method for using a device for detecting light transmittance uniformity of agricultural plastic greenhouse film comprises the following steps: S1: When testing the light transmittance of the plastic greenhouse film 4, the plastic greenhouse film 4 is manually placed between the pressure ring 5 and the slider 9 by the user; S2: The user can directly put the ring 6 into the circular groove of the receiving base 3. Since the receiving base 3 is fixedly arranged directly below the detection head 2, the plastic film 4 on the ring 6 is located directly below the detection head 2. S3: Manually toggle the rod body 702 to drive the turntable 7 to rotate, and the turntable 7 drives the driving slot 701 to rotate. The driving slot 701 cooperates with the driving column 11 to drive the slider 9 to slide along the notch 603. When the slider 9 moves away from the center of the circle 6, because the plastic greenhouse film 4 is in contact with the upper surface of the slider 9, the slider 9 will drive the edges of the plastic greenhouse film 4 to expand in the direction away from the center of the circle 6, thereby straightening and expanding the plastic greenhouse film 4. S4: A detection light of a certain intensity is emitted through the detection head 2, which passes through the plastic greenhouse film 4 and is then received by the receiving base 3. By comparing the attenuation of the detection light before and after, the transmittance of the plastic greenhouse film 4 can be measured.

[0032] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. An agricultural plastic greenhouse film light transmittance uniformity detection device, characterized in that, Comprising: A detector body (1) for carrying and installing various components; A detection head (2) fixedly installed on the upper surface of the detector body (1) for emitting detection light; A receiving base (3) disposed on the upper surface of the detector body (1) and directly below the detection head (2) for receiving the detection light emitted by the detection head (2); A ring (6) disposed inside the receiving base (3), with a plastic shed film (4) provided at the top of the ring (6); A pressing ring (5) disposed on the upper surface of the plastic shed film (4) for pressing the plastic shed film (4) at the top of the ring (6) to limit its position. The pressing ring (5) is made of iron material and can be attracted by a magnet; An unfolding unit for flattening the plastic shed film (4) between the ring (6) and the pressing ring (5). The unfolding unit is disposed inside the ring (6) and is used in cooperation with the pressing ring (5).

2. The light transmittance uniformity detection device for agricultural plastic greenhouse film according to claim 1, characterized in that, A circular groove is formed inside the receiving base (3), and the ring (6) is disposed inside the circular groove. A rubber pad (12) is provided between the bottom end of the ring (6) and the bottom of the circular groove, so that there is no gap between the bottom end of the ring (6) and the bottom of the circular groove. A plurality of protrusions (601) are provided on the outer circumferential surface of the ring (6), and a plurality of grooves (301) matching the protrusions (601) are formed on the inner wall of the circular groove. The protrusions (601) are disposed inside the grooves (301) to limit the rotation of the ring (6) inside the circular groove.

3. The light transmittance uniformity detection device for agricultural plastic greenhouse film according to claim 1, characterized in that, The unfolding unit includes: A plurality of sliders (9). A plurality of notches (603) are equidistantly formed in the circumferential direction on the upper surface of the ring (6), and the plurality of sliders (9) are respectively disposed inside the plurality of notches (603) and are slidably installed on their inner walls; A plurality of magnet sheets (10) respectively disposed on the upper surfaces of the plurality of sliders (9). The magnet sheets (10) are embedded inside the sliders (9). By means of the adsorption of the plurality of magnet sheets (10) on the iron pressing ring (5), the pressing ring (5) presses the plastic shed film (4) on the upper surfaces of the plurality of sliders (9); A turntable (7) is disposed on the lower surface of the ring (6) with a sunk groove (605). The turntable (7) is rotatably installed inside the sunk groove (605). A plurality of driving grooves (701) are equidistantly formed on the upper surface of the turntable (7), and the center lines of the driving grooves (701) coincide with the radius of the turntable (7). Driving columns (11) are fixedly installed on the lower surfaces of the plurality of sliders (9), and the driving columns (11) are disposed inside the driving grooves (701) and are slidably installed on their inner walls. By driving the rotation of the driving grooves (701) by the turntable (7), the driving grooves (701) drive the sliders (9) to slide along the notches (603) through cooperation with the driving columns (11).

4. The light transmittance uniformity detection device for agricultural plastic greenhouse film according to claim 3, characterized in that, A plurality of rod bodies (702) are fixedly mounted on the circumferential outer surface of the rotating disk (7); a plurality of first grooves (606) are provided on the circumferential outer surface of the circular ring (6); the plurality of rod bodies (702) respectively penetrate through the plurality of first grooves (606) and are slidably mounted on the inner wall thereof; a plurality of fixed blocks (8) are fixedly mounted on the upper surface of the receiving base (3); a second groove (801) is provided on the outer surface of the plurality of fixed blocks (8); the rod bodies (702) are arranged inside the second grooves (801) and are slidably mounted on the inner wall thereof.

5. An agricultural plastic greenhouse film light transmittance uniformity detection device according to claim 4, characterized in that A first cavity is provided inside the receiving base (3), a circular hole is provided inside the circular ring (6), the circular hole is connected with the first cavity to form a second cavity, the plurality of notches (603) are connected with the upper surface of the turntable (7) to form a plurality of third cavities, a plurality of air holes (604) are provided at equal intervals on the inner wall of the circular hole, the plurality of air holes (604) are respectively connected with the plurality of third cavities, an air channel (901) is provided inside the slider (9), the air channel (901) is L-shaped, and a port at one end of the air channel (901) is flush with the inner wall of the notch (603).

6. The light transmittance uniformity detection device for agricultural plastic greenhouse film according to claim 5, characterized in that, The outer circumferential surface of the circular ring (6) is provided with a plurality of openings (602) at equal intervals, and the plurality of openings (602) are respectively connected to the interior of a plurality of third cavities.

7. An agricultural plastic greenhouse film light transmittance uniformity detection device according to claim 3, characterized in that The upper surface of the magnet sheet (10) is lower than the upper surface of the slider (9), ensuring that the plastic greenhouse film (4) is in complete contact with the upper surface of the slider (9); the upper surface of the slider (9) and the lower surface of the pressure ring (5) have a roughness between Ra0.2μm and Ra0.4μm.

8. A method for using a detection device for the light transmittance uniformity of an agricultural plastic shed film, characterized in that, The device for detecting light transmittance uniformity of agricultural plastic greenhouse film according to any one of claims 1 to 7 comprises the following steps: S1: When testing the light transmittance of the plastic greenhouse film (4), the plastic greenhouse film (4) is manually placed between the pressure ring (5) and the slider (9) by a user; S2: The user can directly put the circular ring (6) into the circular groove of the receiving base (3). Since the receiving base (3) is fixedly arranged directly below the detection head (2), the plastic shed film (4) on the circular ring (6) is located directly below the detection head (2); S3: manually toggling the rod body (702) to drive the turntable (7) to rotate, and the turntable (7) drives the driving groove (701) to rotate, and the driving groove (701) drives the slider (9) to slide along the notch (603) by cooperating with the driving column (11). When the slider (9) moves away from the center of the circle (6), because the plastic greenhouse film (4) is in contact with the upper surface of the slider (9), the slider (9) drives the edges of the plastic greenhouse film (4) to expand in a direction away from the center of the circle (6), thereby straightening and expanding the plastic greenhouse film (4); S4: A detection light of a certain intensity is emitted through the detection head (2), and the detection light passes through the plastic greenhouse film (4) and is then received by the receiving base (3). By comparing the attenuation of the detection light before and after, the light transmittance of the plastic greenhouse film (4) can be measured.

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