A device and method for detecting light transmittance uniformity of agricultural plastic greenhouse film

Abstract

The present invention relates to the technical field of detection devices, and discloses a device and method for detecting the uniformity of light transmittance of agricultural plastic greenhouse films, comprising a detector body for carrying and installing various components, and a detection head, wherein the detection head is fixedly mounted on the upper surface of the detector body and is used to emit detection light. The present invention manually toggles a rod body to drive a turntable to rotate, which in turn drives a driving slot to rotate. The driving slot cooperates with a driving column to drive a slider to slide along a slot. When the slider moves away from the center of a circular ring, because the plastic greenhouse film is in contact with the upper surface of the slider, the slider drives the edges of the plastic greenhouse film to expand in a direction away from the center of the circular ring, thereby straightening and expanding the plastic greenhouse film, so that the data is more accurate when the light transmittance of the plastic greenhouse film is subsequently tested.

Description

Technical Field

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

[0002] Agricultural film, also known as agricultural film, has a light transmittance test that is an important step in ensuring its effective use in agricultural production. Light transmittance directly affects plant photosynthesis and growth and development, so it requires precise measurement and control.

[0003] When conducting transmittance testing on agricultural film, a batch of agricultural film samples need to be prepared in advance. The flatness and cleanliness of the agricultural film samples need to be ensured during testing. Since the agricultural film samples are elastic, parts of the agricultural film samples will bend or even crease during testing. The bending of the agricultural film samples will cause uneven thickness distribution on the surface of the agricultural film, resulting in differences in transmittance in different areas, which will affect the accuracy of the agricultural film transmittance measurement. Summary of the Invention

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

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A device for detecting light transmittance uniformity of agricultural plastic greenhouse film, comprising:

[0007] The detector body is used to carry and install various components;

[0008] A detection head, which is fixedly mounted on the upper surface of the detector body and is used to emit detection light;

[0009] A receiving base is provided on the upper surface of the detector body and is located directly below the detection head, and is used to receive the detection light emitted by the detection head;

[0010] A circular ring is arranged inside the receiving base, and a plastic shed film is arranged on the top of the circular ring;

[0011] A pressure ring is provided on the upper surface of the plastic greenhouse film and is used to press the plastic greenhouse film on the top of the ring to limit its position. The pressure ring is made of iron material and can be attracted by a magnet;

[0012] The unfolding unit is used to flatten the plastic greenhouse film between the circular ring and the pressure ring. The unfolding unit is arranged inside the circular ring and is used in conjunction with the pressure ring.

[0013] As a further solution of the present invention, a circular groove is provided inside the receiving base, the circular ring is arranged inside the circular groove, and a rubber pad is provided between the bottom end of the circular ring and the bottom of the circular groove. The rubber pad ensures that there is no gap between the bottom end of the circular ring and the bottom of the circular groove. A plurality of protrusions are provided on the circumferential outer surface of the circular ring, and a plurality of grooves matching the protrusions are provided on the inner wall of the circular groove. The protrusions are provided inside the grooves to limit the ring from rotating in the circular groove.

[0014] As a further solution of the present invention, the unfolding unit includes:

[0015] A plurality of sliders, wherein a plurality of slots are equidistantly formed on the upper surface of the ring in the circumferential direction, and the plurality of sliders are respectively arranged inside the plurality of slots and slidably mounted on the inner wall thereof;

[0016] A plurality of magnet sheets, each of which is disposed on the upper surface of a plurality of sliders. The magnet sheets are embedded in the interior of the sliders, and the plurality of magnet sheets adsorb an iron pressure ring, so that the pressure ring presses the plastic greenhouse film onto the upper surface of the plurality of sliders;

[0017] A turntable, a groove is provided on the lower surface of the circular ring, the turntable is rotatably installed inside the groove, a plurality of drive grooves are equidistantly provided on the upper surface of the turntable, the center line of the drive groove coincides with the radius of the turntable, and a drive column is fixedly installed on the lower surface of the plurality of sliders, the drive column is provided inside the drive groove and slidably installed on its inner wall, the drive groove is driven to rotate by the turntable, and the drive groove drives the slider to slide along the groove by cooperating with the drive column.

[0018] 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 opened on the circumferential outer surface of the ring, and the plurality of rod bodies respectively pass through the plurality of first grooves and are slidably installed on the inner wall thereof; a plurality of fixed blocks are fixedly installed on the upper surface of the receiving base, and a second groove is opened on the outer surface of the plurality of fixed blocks, and the rod bodies are arranged inside the second grooves and are slidably installed on the inner wall thereof.

[0019] As a further solution of the present invention, a first cavity is provided inside the receiving base, a circular hole is provided inside the circular ring, the circular hole is connected with the first cavity to form a second cavity, the plurality of slots form a plurality of third cavities through the upper surface of the turntable, a plurality of air holes are provided at equal intervals on the inner wall of the circular hole, the plurality of air holes are respectively connected with a plurality of third cavities, an air duct is provided inside the slider, the air duct is L-shaped, and the port at one end of the air duct is flush with the inner wall of the slot.

[0020] As a further solution of the present invention, a plurality of openings are equidistantly formed on the outer circumferential surface of the ring, and the plurality of openings are respectively connected to the interiors of a plurality of third cavities.

[0021] 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.

[0022] A method for using a device for detecting light transmittance uniformity of agricultural plastic greenhouse film comprises the following steps:

[0023] S1: When testing the light transmittance of the plastic greenhouse film, the user manually places the plastic greenhouse film between the pressure ring and the slider;

[0024] S2: The user can place 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 directly below the detection head.

[0025] S3: Manually toggle the rod to rotate the turntable, which in turn rotates the drive slot. The drive slot cooperates with the drive column to drive the slider to slide along the slot. When the slider moves away from the center of the ring, because the plastic film is in contact with the upper surface of the slider, the slider will drive the edges of the plastic film to expand in a direction away from the center of the ring, thereby straightening and expanding the plastic film.

[0026] 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.

[0027] This application manually drives the turntable to rotate by toggling the rod, and the drive slot is driven to rotate by the turntable. The drive slot drives the slider to slide along the slot by cooperating with the drive 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 expanding 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

[0028] Figure 1 This is a schematic diagram of the overall structure of a device for detecting light transmittance uniformity of agricultural plastic greenhouse films proposed by the present invention;

[0029] Figure 2 This is a schematic diagram of a receiving base of a device for detecting light transmittance uniformity of agricultural plastic greenhouse films proposed by the present invention;

[0030] Figure 3This is a schematic diagram of a fixing block of a device for detecting light transmittance uniformity of agricultural plastic greenhouse films proposed by the present invention;

[0031] Figure 4 This is a schematic diagram of the exploded structure of a device for detecting light transmittance uniformity of agricultural plastic greenhouse films proposed by the present invention;

[0032] Figure 5 This is a cross-sectional schematic diagram of a receiving base of a device for detecting light transmittance uniformity of agricultural plastic greenhouse films proposed by the present invention;

[0033] Figure 6 This is a circular schematic diagram of a device for detecting light transmittance uniformity of agricultural plastic greenhouse films proposed by the present invention;

[0034] Figure 7 This is a schematic structural diagram of a device for detecting light transmittance uniformity of agricultural plastic greenhouse films proposed by the present invention;

[0035] Figure 8 This is a schematic diagram of the position switching of the third cavity of the agricultural plastic greenhouse film light transmittance uniformity detection device proposed by the present invention;

[0036] Figure 9 This is a schematic diagram of the air intake of the third cavity of the device for detecting the uniformity of light transmittance of agricultural plastic greenhouse films proposed by the present invention;

[0037] Figure 10 This is a schematic diagram of a turntable of a device for detecting light transmittance uniformity of agricultural plastic greenhouse films proposed by the present invention;

[0038] Figure 11 This is a schematic diagram of a slider of a device for detecting light transmittance uniformity of agricultural plastic greenhouse film proposed by the present invention.

[0039] In the figure: 1. Detector body; 2. Detection head; 3. Receiving base; 301. Groove; 4. Plastic film; 5. Pressure ring; 6. Ring; 601. Protrusion; 602. Opening; 603. Notch; 604. Air hole; 605. Sink; 606. First slot; 7. Turntable; 701. Drive slot; 702. Rod; 8. Fixed block; 801. Second slot; 9. Slider; 901. Air duct; 10. Magnet; 11. Drive column; 12. Rubber pad. DETAILED DESCRIPTION

[0040] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0041] like Figure 1 、 Figure 2 and Figure 3As shown, a device for detecting the uniformity of light transmittance of 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 plastic greenhouse film 4 on the top of the circular ring 6 and limiting its position, and an unfolding unit for flattening the plastic greenhouse film 4 between the circular ring 6 and the pressure ring 5.

[0042] like Figure 1 As shown, the detection head 2 is fixedly mounted 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 is located directly below the detection head 2. The detection head 2 emits a detection light of a certain intensity, 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.

[0043] like Figure 2 As shown, the circular ring 6 is arranged inside the receiving base 3, and a plastic greenhouse film 4 is arranged on the top of the circular ring 6. The pressure ring 5 is arranged on the upper surface of the plastic greenhouse film 4. The pressure ring 5 is made of iron material and can be attracted by a magnet. The circular ring 6 and the pressure ring 5 are both arranged in a ring shape, which allows the detection light to pass through the middle position. Because the plastic greenhouse film 4 is very thin and light and can be blown away by the wind, the plastic greenhouse film 4 is pressed on the top of the circular ring 6 by the pressure ring 5 to prevent the plastic greenhouse film 4 from slipping, making it convenient to detect its light transmittance.

[0044] Because in reality, when testing the transmittance of the plastic film 4, in order to ensure the accuracy of the test data, it is necessary to test multiple samples in batches, and when testing the transmittance of the plastic film 4, it is necessary to ensure that the plastic film 4 is located directly below the detection head 2 and the position cannot be offset. In order to quickly align the position of the plastic film 4, such as Figure 4 and Figure 5 As shown, in this embodiment, a circular groove is opened inside the receiving base 3, and a circular ring 6 is arranged inside the circular groove. Through the cooperation of the circular groove and the circular ring 6, the user can put the circular ring 6 directly into the circular groove of the receiving base 3. Because the receiving base 3 is fixedly set directly below the detection head 2, the plastic greenhouse film 4 on the circular ring 6 is located directly below the detection head 2. The plastic greenhouse film 4 can be quickly positioned by this device, and at the same time, its position displacement can be avoided.

[0045] Since the plastic film 4 is elastic, it may bend or crease locally during the test, resulting in uneven surface thickness distribution, which in turn affects the regional differences in light transmittance. In order to ensure that the surface of the plastic film 4 is fully unfolded and straightened during the test, Figure 2 and Figure 3As shown, in this embodiment, an expansion unit is provided inside the ring 6, and the expansion unit is used in conjunction with the pressure ring 5 to completely straighten and expand the plastic film 4 between the top of the ring 6 and the pressure ring 5, wherein the expansion unit includes: Figure 3 As shown, several sliders 9 for carrying the plastic film 4 are used to attract several magnet pieces 10 of the iron pressure ring 5. Figure 6 The turntable 7 shown is used to drive several sliders 9 to move.

[0046] like Figure 3 As shown, a plurality of notches 603 are equidistantly provided on the upper surface of the ring 6 in the circumferential direction. A plurality of sliders 9 are respectively arranged inside the plurality of notches 603 and slidably installed on the inner wall thereof. The upper surfaces of the plurality of sliders 9 are flush with the upper surface of the ring 6, which can ensure that the plastic film 4 can be completely flat. Figure 6 As shown, the lower surface of the ring 6 is provided with a sinking groove 605, and the turntable 7 is rotatably installed inside the sinking groove 605. The upper surface of the turntable 7 is provided with a plurality of driving grooves 701 at equal intervals. Figure 11 As shown, a driving column 11 is fixedly installed on the lower surface of several sliders 9. The driving column 11 is arranged inside the driving groove 701 and slidably installed on its inner wall. The driving groove 701 is driven to rotate by the turntable 7, and the driving groove 701 drives the slider 9 to slide along the slot 603 by cooperating with the driving column 11. There are two sliding directions of the slider 9, one is moving close to the center of the ring 6, and the other is moving away from the center of the ring 6. Several sliders 9 are evenly distributed on the upper surface of the ring 6 to ensure that when the plastic greenhouse film 4 is straightened and unfolded subsequently, the pulling force of the slider 9 on it is multi-directional and uniform, and the two adjacent sliders 9 have an overlapping distance at the head and tail, so that when the slider 9 straightens and unfolds the plastic greenhouse film 4, the surface of the plastic greenhouse film 4 is exerted with force, avoiding wrinkles or unevenness of the plastic greenhouse film 4 in areas where no force is applied.

[0047] like Figure 10 As shown, the center line of the driving groove 701 is arranged to coincide with the radius of the turntable 7, as shown in FIG. Figure 7 As shown, there is a certain angle between the center line of the notch 603 and the radius of the ring 6 . This setting ensures that the driving groove 701 can correctly drive the slider 9 to move through the driving column 11 .

[0048] like Figure 2 and Figure 3As shown, several magnet pieces 10 are respectively arranged on the upper surfaces of several sliders 9. Since the pressure ring 5 is made of iron material, it will be adsorbed by several magnet pieces 10, thereby pressing the plastic greenhouse film 4 between the pressure ring 5 and the slider 9, so that the plastic greenhouse film 4 is at the top of the circular ring 6. The magnet piece 10 is embedded in the interior of the slider 9. The upper surface of the magnet piece 10 is lower than the upper surface of the slider 9, ensuring that the plastic greenhouse film 4 is in full contact with the upper surface of the slider 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 edges of the plastic greenhouse film 4 to expand in the direction away from the center of the circular ring 6, thereby straightening and expanding the plastic greenhouse film 4.

[0049] 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. Through the setting of this 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 it 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.

[0050] 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, and a plurality of first grooves 606 are provided on the circumferential outer surface of the ring 6. The 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 user manually moves the rod body 702 to drive the turntable 7 to rotate. The motion 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.

[0051] 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. The rod body 702 is arranged inside the second groove 801 and is 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 set in a circular arc, it can slide along the inner wall of the second groove 801 by applying force.

[0052] When testing 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, if 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 ring 6. The circular hole is connected to the first cavity to form a second cavity. The rubber pad 12 is used to prevent a gap between the bottom end of the ring 6 and the bottom of the circular groove of the receiving base 3, thereby preventing air leakage in the second cavity formed between the ring 6 and the receiving base 3. Figure 7 As shown, several notches 603 form several 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. 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 switched to the switching position by the sliding of the slider 9, as shown in FIG. Figure 6As shown, a number of air holes 604 are equidistantly provided on the inner wall of the circular hole inside the ring 6, and the air holes 604 are respectively connected to a number of third cavities. An air channel 901 is provided inside the slider 9, and the air channel 901 is L-shaped. The port at one end of the air channel 901 is flush with the inner wall of the slot 603 in order to seal the air channel 901.

[0053] When the plastic film 4 is covered on the top of the ring 6, since the upper surface of the slider 9 is flush with the outer surface of the top of the ring 6, the plastic film 4 is pressed on the upper surface of the slider 9 and the ring 6 under the cooperation of the pressure ring 5 and the magnet sheet 10. At this time, the second cavity and the third cavity are completely covered by the plastic film 4. When the turntable 7 is rotated to straighten and unfold the plastic film 4, the slider 9 moves away from the center of the ring 6 inside the third cavity. At this time, the third cavity is gradually formed at the end of the notch 603 close to the center of the ring 6. Because of the formation of the third cavity, the second cavity forms a negative pressure space through the air hole 604. This negative pressure increases with the increase of the third cavity. At this time, the plastic film 4 located in the second cavity Because the negative pressure is sucked and gradually sucked more firmly as the negative pressure increases, and because the middle position of the plastic greenhouse film 4 is sucked, the slider 9 will slowly tear open the folded plastic greenhouse film 4 between the pressure ring 5 and the outer surface of the slider 9 when straightening and unfolding the plastic greenhouse film 4, so as to avoid the position of the plastic greenhouse film 4 being offset or pulled to form more wrinkles when continuing to unfold it. As the negative pressure of the second cavity gradually increases, the force that sucks 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 increasing the suction force so that the film around it can be straightened and unfolded.

[0054] Because the negative pressure of the second cavity causes the middle of the plastic film 4 to sag downward, the plastic film 4 in the middle becomes thinner due to elastic deformation, thereby affecting the accuracy of transparency detection. In this embodiment, Figure 8 and Figure 9 As shown, a number of openings 602 are equidistantly provided on the outer surface of the circumference of the ring 6, and the several openings 602 are respectively connected to the interior of a number of third cavities. When the port at one end of the air duct 901 inside the slider 9 moves to the position of the opening 602, the third cavity will be connected to the outside through the air duct 901 and the opening 602. At this time, the external air enters the interior of the second cavity, so that the air pressure inside it is restored to balance. At this time, the film in the middle position of the plastic greenhouse film 4 that has been deformed by the negative pressure of the second cavity will return to its original shape. In order to ensure that the restored plastic greenhouse film 4 can be flattened, at this time, continue to rotate the turntable 7 so that the slider 9 slides outward for a distance to completely flatten the plastic greenhouse film 4. The plastic greenhouse film 4 can be completely flattened by this device, so that the data will be more accurate when the transmittance of the plastic greenhouse film 4 is subsequently tested.

[0055] A method for using a device for detecting light transmittance uniformity of agricultural plastic greenhouse film comprises the following steps:

[0056] S1: When testing the light transmittance of the plastic greenhouse film 4, the user manually places the plastic greenhouse film 4 between the pressure ring 5 and the slider 9;

[0057] 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.

[0058] S3: Manually toggle the rod 702 to rotate the turntable 7, which in turn rotates the driving slot 701. 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 ring 6, because the plastic film 4 is in contact with the upper surface of the slider 9, the slider 9 drives the edges of the plastic film 4 to expand in a direction away from the center of the ring 6, thereby straightening and expanding the plastic film 4.

[0059] S4: The detection head 2 emits a detection light of a certain intensity, 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.

[0060] The basic principles, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A device for detecting light transmittance uniformity of agricultural plastic greenhouse film, characterized in that: include: The detector body (1) is used to carry and install various components; A detection head (2), the detection head (2) is fixedly mounted on the upper surface of the detector body (1) and is used to emit detection light; A receiving base (3), the receiving base (3) being arranged on the upper surface of the detector body (1) and located directly below the detection head (2), and being used for receiving detection light emitted by the detection head (2); A circular ring (6), the circular ring (6) being arranged inside the receiving base (3), and a plastic shed film (4) being arranged on the top of the circular ring (6); A pressure ring (5), the pressure ring (5) is arranged on the upper surface of the plastic greenhouse film (4), and is used to press the plastic greenhouse film (4) on the top of the ring (6) to limit its position. The pressure ring (5) is made of iron material and can be attracted by a magnet; An unfolding unit is used to flatten the plastic greenhouse film (4) between the circular ring (6) and the pressure ring (5). The unfolding unit is arranged inside the circular ring (6) and used in conjunction with the pressure ring (5). The unfolding unit includes a plurality of sliders (9) and a turntable (7). A plurality of notches (603) are equidistantly provided on the upper surface of the circular ring (6) in the circumferential direction. The plurality of sliders (9) are respectively arranged inside the plurality of notches (603) and slidably installed on the inner wall thereof. A sink groove (605) is provided on the lower surface of the circular ring (6). The turntable (7) is rotatably installed inside the sink groove (605). A first cavity is provided inside the receiving base (3). A plurality of notches (603) are provided inside the circular ring (6). A circular hole is connected to the first cavity to form a second cavity, the plurality of notches (603) form a plurality of third cavities through the upper surface of the turntable (7), the inner wall of the circular hole is provided with a plurality of air holes (604) at equal intervals, the plurality of air holes (604) are respectively connected to the plurality of third cavities, the interior of the slider (9) is provided with an air channel (901), the air channel (901) is L-shaped, the port at one end of the air channel (901) is flush with the inner wall of the notch (603), the outer surface of the circumference of the ring (6) is provided with a plurality of openings (602) at equal intervals, the plurality of openings (602) are respectively connected to the interior of the plurality of third cavities.

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

3. The device for detecting light transmittance uniformity of agricultural plastic greenhouse film according to claim 1, characterized in that: The unfolding unit further comprises a plurality of magnet sheets (10), the plurality of magnet sheets (10) being respectively arranged on the upper surfaces of the plurality of sliders (9), the magnet sheets (10) being embedded in the interior of the sliders (9), and the plurality of magnet sheets (10) adsorbing the iron pressure ring (5) so that the pressure ring (5) presses the plastic greenhouse film (4) on the upper surfaces of the plurality of sliders (9), the upper surface of the turntable (7) being equidistantly provided with a plurality of driving grooves (701), the center line of the driving groove (701) being arranged to coincide with the radius of the turntable (7), the lower surfaces of the plurality of sliders (9) being fixedly mounted with driving columns (11), the driving columns (11) being arranged inside the driving groove (701) and being slidably mounted on the inner wall thereof, the driving groove (701) being driven to rotate by the turntable (7), and the driving groove (701) driving the slider (9) to slide along the notch (603) by cooperating with the driving columns (11).

4. The device for detecting light transmittance uniformity of 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 turntable (7), a plurality of first grooves (606) are opened on the circumferential outer surface of the ring (6), and the plurality of rod bodies (702) respectively penetrate 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), and a plurality of second grooves (801) are opened on the outer surfaces of the plurality of fixed blocks (8), and the rod bodies (702) are arranged inside the second grooves (801) and are slidably mounted on the inner wall thereof.

5. The device for detecting light transmittance uniformity of agricultural plastic greenhouse film according to claim 4, 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 shed film (4) is in complete contact with the upper surface of the slider (9), and 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.

6. A method for using a device for detecting light transmittance uniformity of agricultural plastic greenhouse film, characterized in that: The device for detecting light transmittance uniformity of agricultural plastic greenhouse film according to claim 5 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 place 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 toggling the rod (702) to drive the turntable (7) to rotate, and the turntable (7) drives the driving slot (701) to rotate, and the driving slot (701) drives the slider (9) to slide along the slot (603) by cooperating with the driving column (11). When the slider (9) moves away from the center of the circle of the ring (6), because the plastic shed film (4) and the upper surface of the slider (9) are in contact, the slider (9) drives the edges of the plastic shed film (4) to expand in a direction away from the center of the circle of the ring (6), thereby straightening and expanding the plastic shed film (4); S4: A detection light of a certain intensity is emitted through the detection head (2). The detection light passes through the plastic 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 film (4) can be measured.

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