Light transmittance detection device for agricultural film production

Abstract

The invention relates to the technical field of light transmittance detection devices, in particular to a light transmittance detection device for agricultural film production. Comprising a detection host; the detection probe is fixedly connected to the upper side of the detection main machine through a stand column, guide rails are installed on the two sides of the detection main machine, the guide rails are connected with electric sliding blocks in a sliding mode, and the electric sliding blocks are rotationally connected with carrier rollers; the electric push rod is fixedly connected to a stand column of the detection host, the extrusion assembly is provided with a fixed sliding rail, sliding grooves are formed in the two sides of the fixed sliding rail, and the fixed sliding rail is located above the guide rail; and the number of the sliding pieces is two, the two sliding pieces are connected into the sliding grooves of the fixed sliding rails in a sliding mode correspondingly, and the sliding pieces are rotationally connected with extrusion rollers. The two groups of carrier rollers and extrusion rollers are used for mutually extruding to flatten a film towards the left side and the right side, so that the bending degree of the film is reduced, and the influence of folds of the film on the light transmittance of the film is weakened.

Description

Technical Field

[0001] The present invention relates to the technical field of transmittance detection devices, and in particular to a transmittance detection device for agricultural film production. Background Art

[0002] Agricultural film is also called agricultural film. The transmittance detection of agricultural film is an important step to ensure its effective use in agricultural production. The transmittance directly affects the photosynthesis and growth and development of plants, so it needs to be accurately measured and controlled.

[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 themselves 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 measurement of the overall transmittance and make the results unable to reflect the true performance of the agricultural film. In addition, different agricultural film samples need to be tested multiple times during testing. The testers keep stretching the samples, which will greatly reduce the efficiency of testing the agricultural film samples. Summary of the invention

[0004] In order to overcome the shortcoming that the existing transmittance detection device cannot flatten the agricultural film sample, the present invention provides a transmittance detection device for agricultural film production.

[0005] Technical solution: A light transmittance detection device for agricultural film production, comprising: Detection host; The detection probe is fixed to the upper side of the detection host through a column, and guide rails are installed on both sides of the detection host. The guide rails are slidably connected to electric sliders, and the electric sliders are rotatably connected to rollers; An electric push rod is fixedly connected to the column of the detection host, and a squeezing assembly is provided at the telescopic end of the electric push rod, and the squeezing assembly is used to pre-fix the agricultural film sample. The squeezing assembly is installed with a fixed slide rail, and slide grooves are provided on both sides of the fixed slide rail, and the fixed slide rail is located above the guide rail; Two sliding members are provided, the two sliding members are respectively slidably connected in the slide grooves of the fixed slide rails, the sliding members are rotatably connected with the squeezing rollers, a connecting shell is fixedly connected to the side of the sliding member away from the squeezing roller, a sliding rod is fixedly connected to the side of the connecting shell close to the electric slider, the sliding rod passes through the adjacent electric sliders and the two are slidably connected; The squeezing roller and the adjacent supporting rollers clamp the agricultural film and stretch it to both sides, so that the agricultural film is flattened on the upper side of the detection host.

[0006] Furthermore, the squeezing roller is located directly above the supporting roller and is used to apply a vertical squeezing force to the agricultural film sample.

[0007] Furthermore, the upper side of the roller is flush with the upper side of the detection host, so that the agricultural film sample is always in contact with the upper side of the detection host when being stretched.

[0008] Furthermore, the outer sides of the supporting roller and the squeezing roller are wrapped with anti-slip sleeves to increase the friction between the supporting roller and the squeezing roller and the agricultural film sample.

[0009] Furthermore, the extrusion assembly includes: A fixed shell is fixedly connected to the telescopic end of the electric push rod, the fixed shell is slidably connected to a sliding column, the sliding column passes through the fixed slide rail and the two are fixedly connected; A spring, sleeved on the outer side of the sliding column, with two ends of the spring respectively fixed to the fixed shell and the fixed slide rail; The extrusion block is fixedly connected to the lower end of the sliding column and is used for pre-fixing the agricultural film sample.

[0010] Furthermore, the lower side of the extrusion block is set to a smooth material to reduce the friction resistance between the extrusion block and the agricultural film sample.

[0011] Furthermore, the lower side of the extrusion block is flush with the lower side of the extrusion roller.

[0012] Furthermore, it also includes: Two sets of resistance adjustment mechanisms, the resistance adjustment mechanisms are arranged between the sliding member and the adjacent connecting shell, and the resistance adjustment mechanisms include: A first connecting block, the first connecting block is fixedly connected to one end of the squeezing roller close to the connecting shell, the first connecting block is located in the connecting shell, and a connecting rod is spline-connected to one side of the connecting shell away from the squeezing roller; A second connecting block, fixedly connected to one end of the connecting rod close to the first connecting block and located in the connecting shell, wherein the connecting rod is provided with threads; A fixing frame is fixedly connected to a side of the connecting shell away from the sliding member, the fixing frame is rotatably connected to a threaded sleeve, and the threaded sleeve is threadedly connected to the thread of the connecting rod; A fixed rod is fixedly connected to one side of the threaded sleeve, the sliding member is hinged with a hydraulic rod through a mounting seat, the telescopic end of the hydraulic rod is hinged to the fixed rod, two elastic oil bags are fixedly connected between the fixed shell and the sliding column, and the elastic oil bags are filled with hydraulic oil, and the hydraulic rod is connected to the elastic oil bag through an oil guide pipe.

[0013] Furthermore, the first connection block and the second connection block are both composed of magnets distributed at intervals, and a gap is left between the first connection block and the second connection block.

[0014] Furthermore, the cross-sectional area of ​​the elastic oil bag is larger than the cross-sectional area of ​​the hydraulic rod oil chamber.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The present invention utilizes two groups of rollers and squeezing rollers to squeeze each other and flatten the film to the left and right sides, thereby reducing the bending degree of the film and weakening the influence of the creases of the film on its transmittance, thereby improving the accuracy of the device in detecting the transmittance of the film and reducing the labor intensity of the inspectors.

[0016] 2. The present invention utilizes the second connecting block to generate resistance to the adjacent first connecting block, thereby providing resistance for the rotation of the extrusion roller. When the support roller and the extrusion roller move synchronously, both the support roller and the extrusion roller rotate, and the film is flattened by the friction force of the extrusion roller on the film. In addition, the magnetic field between the first connecting block and the second connecting block is utilized to ensure that the resistance encountered by the extrusion roller during rotation remains the same.

[0017] 3. The present invention utilizes threads to drive adjacent connecting rods to slide along the connecting shell, and the connecting rods drive the second connecting block to move closer to the first connecting block, thereby reducing the gap between the first connecting block and the second connecting block, and increasing the magnetic field strength between the first connecting block and the second connecting block, thereby increasing the thickness of the film, increasing the magnetic field strength between the first connecting block and the second connecting block, and increasing the resistance of the extrusion roller when rotating, to increase the pulling force on both sides of the film, so that the film is in a flattened state on the upper side of the detection host, reducing the influence of creases on the detection accuracy of the film transmittance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the fixed slide rail, extrusion block and other parts of the present invention; Figure 3 A schematic diagram of a three-dimensional structure from another viewing angle of the present invention; Figure 4 It is a three-dimensional structural schematic diagram of the supporting roller, squeezing roller and other parts of the present invention; Figure 5 It is a three-dimensional structural schematic diagram of the electric push rod and the fixing housing and other parts of the present invention; Figure 6 It is a schematic diagram of the cross-sectional three-dimensional structure of the fixed shell of the present invention; Figure 7 It is a schematic diagram of the cross-sectional three-dimensional structure of the connecting shell of the present invention; Figure 8 It is a rear view stereoscopic structural schematic diagram of the threaded sleeve, hydraulic rod and other parts of the present invention.

[0019] Figure numerals: 1. Detection host, 2. Detection probe, 3. Guide rail, 4. Electric slider, 5. Roller, 6. Electric push rod, 7. Fixed slide rail, 8. Sliding member, 9. Extrusion roller, 10. Connecting shell, 11. Slide rod, 12. Fixed shell, 13. Sliding column, 14. Spring, 15. Extrusion block, 16. First connecting block, 17. Connecting rod, 18. Second connecting block, 19. Fixed frame, 20. Threaded sleeve, 21. Fixed rod, 22. Hydraulic rod. DETAILED DESCRIPTION

[0020] Although the present invention may be described with respect to a particular application or industry, those skilled in the art will recognize the broader applicability of the present invention.Any numerical designations such as: first or second are merely exemplary and are not intended to limit the scope of the present invention in any way.

[0021] Example 1: A light transmittance detection device for agricultural film production, referring to Figure 1-Figure 5 , including: a detection host 1; a detection probe 2, which is fixed to the upper side of the detection host 1 through a column, the detection probe 2 is perpendicular to the detection host 1, and guide rails 3 are installed on both sides of the detection host 1, and the guide rails 3 are slidably connected to an electric slider 4, and the electric slider 4 is rotatably connected to a roller 5. The guide rails 3 and the electric slider 4 are existing devices, and their internal structures are not shown in the accompanying drawings; an electric push rod 6, which is fixed to the column of the detection host 1, and an extrusion component is provided at the telescopic end of the electric push rod 6, and the extrusion component is installed with a fixed slide rail 7, and slide grooves are provided on both sides of the fixed slide rail 7. The cross section of the slide groove of the fixed slide rail 7 is set to T shape, and the fixed slide rail 7 is located above the guide rail 3; there are two sliding members 8, and the two sliding members 8 are respectively slidably connected to the slide grooves of the fixed slide rail 7, and the sliding member 8 is rotatably connected to the extrusion roller 9, and the rear of the sliding member 8 A connecting shell 10 is fixedly connected to the side, and a sliding rod 11 is fixedly connected to the lower side of the connecting shell 10. The sliding rod 11 passes through the adjacent electric slider 4 and the two are slidably connected. The electric slider 4 uses the sliding rod 11 to drive the adjacent sliding parts 8 to move synchronously; the squeezing roller 9 and the adjacent rollers 5 clamp the agricultural film and stretch it to both sides, so that the agricultural film is flattened on the upper side of the detection host 1, reducing the influence of the bending of the agricultural film sample on the transmittance detection. The squeezing roller 9 is located directly above the roller 5, which is used to apply a vertical squeezing force to the agricultural film sample, reduce the deformation of the agricultural film sample when it is tightened, and flatten the agricultural film sample laterally. The upper side of the roller 5 is flush with the upper side surface of the detection host 1, keeping the agricultural film sample in contact with the upper side surface of the detection host 1 when being stretched. The outer sides of the rollers 5 and the squeezing rollers 9 are wrapped with anti-slip sleeves to increase the friction between the rollers 5 and the squeezing rollers 9 and the agricultural film sample.

[0022] Reference Figure 5 and Figure 6The extrusion assembly includes: a fixed shell 12, which is fixedly connected to the telescopic end of the electric push rod 6. The fixed shell 12 is slidably connected to a sliding column 13, and the sliding column 13 passes through the fixed slide rail 7 and the two are fixedly connected; a spring 14 is sleeved on the outer side of the sliding column 13, and the two ends of the spring 14 are respectively fixedly connected to the fixed shell 12 and the fixed slide rail 7; an extrusion block 15 is fixedly connected to the lower end of the sliding column 13 and is used to pre-fix the agricultural film sample. The lower side of the extrusion block 15 is set to a smooth material to reduce the friction resistance between the extrusion block 15 and the agricultural film sample. The lower side of the extrusion block 15 is flush with the lower side of the extrusion roller 9 to ensure that the extrusion roller 9 and the extrusion block 15 contact the agricultural film sample together.

[0023] In the above scheme, the purpose is to increase the flatness of the agricultural film sample, reduce the influence of the creases on the agricultural film sample on its transmittance, and improve the accuracy of the detection of the agricultural film sample by the device. In order to ensure the stability of the detection host 1, four adjustment legs can be installed on the lower side of the detection host 1. A light source for detection in cooperation with the detection probe 2 is arranged on the upper side of the detection host 1. The light generated by the light source on the detection host 1 passes through the agricultural film sample and is detected by the detection probe 2. In order to improve the detection efficiency of the agricultural film, the irradiation range of the light source on the upper side of the detection host 1 can be increased, and the detection probe 2 can be set to be movable, and the agricultural film sample can be detected at multiple points to measure the transmittance of the agricultural film sample. The left and right guide rails 3 are on the same straight line, and the two electric sliders 4 are of the same model, which ensures that the two electric sliders 4 move at the same speed. A control panel is installed on the front side of the detection host 1. The control panel is electrically connected to the two electric sliders 4 and is used to control the electric sliders 4 to move along the adjacent guide rails 3. The electric push rod 6 is also electrically connected to the control panel of the detection host 1.

[0024] Workflow: When using the device to test agricultural film samples (hereinafter referred to as "film"), the tester places the film on the upper side of the test host 1, and the film is bent downward on the upper side of the two rollers 5 (such as Figure 1), the inspector corrects the placement of the film and starts the device. The control panel of the inspection host 1 starts the electric push rod 6. The telescopic end of the electric push rod 6 drives the fixed shell 12 to move downward. Under the elastic force of the spring 14, the spring 14 drives the sliding column 13 to move downward synchronously through the fixed slide rail 7 until the extrusion block 15 fits and squeezes the upper side of the film. The telescopic end of the electric push rod 6 continues to drive the fixed shell 12 to move downward until it is fully extended. Then the electric push rod 6 is closed, and the fixed shell 12 slides downward along the sliding column 13. At the same time, the spring 14 is compressed. If the thickness of the film is As the degree increases, the distance that the fixed shell 12 moves along the sliding column 13 will increase, and the compression amount of the spring 14 will also increase. When the sliding column 13 moves downward, the sliding column 13 drives the fixed slide rail 7 to move downward synchronously, and the fixed slide rail 7 drives all the parts thereon to move downward synchronously through the sliding members 8 on both sides. When the extrusion block 15 is attached to and squeezed to the upper side of the film, the extrusion rollers 9 on the left and right sides are also squeezed on both sides of the film. The extrusion rollers 9 and the adjacent rollers 5 squeeze each other to complete the extrusion of the film. In the above process, the slide bar 11 slides downward along the electric slider 4.

[0025] After completing the above work, the control panel of the detection host 1 starts the two electric sliders 4, and the two electric sliders 4 move away from each other. At the same time, the electric sliders 4 drive the connecting shell 10 and the adjacent sliding member 8 to move synchronously through the slide rod 11, and the rollers 5 and the squeezing rollers 9 on the same side squeeze each other, thereby applying tension to both sides of the film to flatten the film on the upper side of the detection host 1. When the electric sliders 4 move to the top of the adjacent guide rails 3, the control panel of the detection host 1 closes the two electric sliders 4 and flattens the film to the left and right sides, thereby reducing the degree of bending of the film and weakening the influence of the creases of the film on its transmittance, thereby improving the accuracy of the device in detecting the transmittance of the film.

[0026] The detection host 1 cooperates with the detection probe 2 to detect the flattened film, and then the detection value is displayed on the control panel of the detection host 1. After the detection is completed, the control panel of the detection host 1 starts the electric push rod 6, so that the telescopic end of the electric push rod 6 drives the parts on it to move upward and reset, and the electric push rod 6 is closed after the telescopic end is reset. During the resetting process of the telescopic end of the electric push rod 6, the fixed slide rail 7 drives the two sliding parts 8 and the parts thereon to move upward and reset, and then the control panel of the detection host 1 starts the two electric slides 4, so that the two electric slides 4 move close to each other and reset. During the resetting process, the electric slides 4 move the two sliding parts 8 close to each other and reset, and the control panel closes the two electric slides 4. The detection personnel remove the film after the detection from the upper side of the detection host 1 to prepare for the next detection.

[0027] Example 2: Based on Example 1, Figure 4 , Figure 7 and Figure 8, further comprising: two sets of resistance adjustment mechanisms, the resistance adjustment mechanisms are arranged between the sliding member 8 and the adjacent connecting shell 10, the resistance adjustment mechanisms comprising: a first connecting block 16, the first connecting block 16 is fixedly connected to the rear end of the squeezing roller 9, the first connecting block 16 is located in the connecting shell 10, and the rear side of the connecting shell 10 is splined with a connecting rod 17; a second connecting block 18 is fixedly connected to the front end of the connecting rod 17 and is located in the connecting shell 10, and the connecting rod 17 is provided with threads; a fixing frame 19 is fixedly connected to the rear side of the connecting shell 10, and the fixing frame 19 is rotatably connected with a threaded sleeve 20, and the threaded sleeve 20 is threadedly connected to the thread of the connecting rod 17; a fixing rod 21 , fixed to one side of the threaded sleeve 20, the sliding member 8 is hinged with a hydraulic rod 22 through a mounting seat, the telescopic end of the hydraulic rod 22 is hinged to the fixed rod 21, two elastic oil bags are fixed between the fixed shell 12 and the sliding column 13, and the elastic oil bags are filled with hydraulic oil, the hydraulic rod 22 is connected to the elastic oil bag through an oil guide pipe, the first connecting block 16 and the second connecting block 18 are both composed of magnets distributed at intervals, and a gap is left between the first connecting block 16 and the second connecting block 18. The magnetic fields between the first connecting block 16 and the second connecting block 18 interact with each other to apply rotational resistance to the squeezing roller 9, and the cross-sectional area of ​​the elastic oil bag is larger than the cross-sectional area of ​​the oil cavity of the hydraulic rod 22.

[0028] In the above scheme, the purpose is to avoid excessive stretching of the film, which may cause changes in the transmittance of the film, ensure that the film is in a uniformly flattened state, and improve the accuracy of the device in detecting the transmittance of the film. The connecting shell 10 is fixed to the adjacent sliding member 8 through a mounting seat, and a sealing ring is installed between the connecting shell 10 and the connecting rod 17. The connecting shell 10 is mainly used to protect the first connecting block 16 and the adjacent second connecting block 18. The working process is as follows: After the extrusion block 15 squeezes the upper side of the film, the fixed shell 12 continues to move downward, and the hydraulic oil in the two elastic oil bags between the fixed shell 12 and the sliding column 13 flows into the two hydraulic rods 22 through the oil guide pipe. At this time, the second connecting block 18 is used to generate resistance to the adjacent first connecting block 16 to provide resistance for the rotation of the extrusion roller 9. When the roller 5 and the extrusion roller 9 move synchronously, the roller 5 and the extrusion roller 9 both rotate, and the film is flattened by the friction force of the extrusion roller 9 on the film.

[0029] As the thickness of the film increases, and the magnetic field between the first connecting block 16 and the second connecting block 18 is used to ensure that the resistance to the rotation of the squeezing roller 9 remains the same, the discharge amount of the hydraulic oil between the fixed shell 12 and the sliding column 13 increases, and the extension length of the telescopic ends of the two hydraulic rods 22 increases. The telescopic ends of the hydraulic rods 22 drive the adjacent threaded sleeves 20 to rotate through the fixed rods 21, and the threaded sleeves 20 rotate along the fixed frame 19. The rotation angle of the threaded sleeves 20 increases with the extension length of the telescopic ends of the hydraulic rods 22. The threaded sleeves 20 drive the adjacent connecting rods by means of threads. 17 slides along the connecting shell 10, and the connecting rod 17 drives the second connecting block 18 to move closer to the first connecting block 16, thereby reducing the gap between the first connecting block 16 and the second connecting block 18 and increasing the magnetic field strength between the first connecting block 16 and the second connecting block 18, thereby increasing the thickness of the film, increasing the magnetic field strength between the first connecting block 16 and the second connecting block 18, and increasing the resistance of the squeezing roller 9 when rotating, thereby increasing the pulling force on the film to both sides, so that the film is in a flattened state on the upper side of the detection host 1, reducing the influence of creases on the detection accuracy of the film transmittance.

[0030] After the light transmittance of the film is detected, the telescopic end of the electric push rod 6 moves upward to reset. At this time, under the action of the elastic force of the spring 14, the sliding column 13 slides and resets along the fixed shell 12, the elastic oil bag in the fixed shell 12 and the sliding column 13 resets, the telescopic ends of the two hydraulic rods 22 reset, and under the drive of the threaded sleeve 20, the connecting rod 17 drives the second connecting block 18 to reset, and then repeats the above operation to reset all parts on the device. The above is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A light transmittance detection device for agricultural film production, characterized in that: Included are: Detect host (1); The detection probe (2) is fixedly connected to the upper side of the detection host (1) via a column, and guide rails (3) are installed on both sides of the detection host (1), and the guide rails (3) are slidably connected to electric sliders (4), and the electric sliders (4) are rotatably connected to rollers (5); An electric push rod (6) is fixedly connected to a column of the detection host (1); a squeeze assembly is provided at the telescopic end of the electric push rod (6); the squeeze assembly is used to pre-fix the agricultural film sample; a fixed slide rail (7) is installed on the squeeze assembly; slide grooves are provided on both sides of the fixed slide rail (7); the fixed slide rail (7) is located above the guide rail (3); Two sliding members (8) are provided, the two sliding members (8) are respectively slidably connected in the slide grooves of the fixed slide rail (7), the sliding member (8) is rotatably connected to the squeezing roller (9), the side of the sliding member (8) away from the squeezing roller (9) is fixedly connected to a connecting shell (10), the side of the connecting shell (10) close to the electric slider (4) is fixedly connected to a sliding rod (11), the sliding rod (11) passes through the adjacent electric slider (4) and the two are slidably connected; The squeezing roller (9) and the adjacent supporting roller (5) clamp the agricultural film and stretch it toward both sides, so that the agricultural film is flattened on the upper side of the detection host (1).

2. A light transmittance detection device for agricultural film production according to claim 1, characterized in that: The squeezing roller (9) is located directly above the supporting roller (5) and is used to apply a vertical squeezing force to the agricultural film sample.

3. A light transmittance detection device for agricultural film production according to claim 2, characterized in that: The upper side of the roller (5) is flush with the upper side of the detection host (1), so that the agricultural film sample is always in contact with the upper side of the detection host (1) when being stretched.

4. A light transmittance detection device for agricultural film production according to claim 3, characterized in that: The outer sides of the supporting roller (5) and the squeezing roller (9) are both wrapped with anti-slip sleeves, which are used to increase the friction between the supporting roller (5) and the squeezing roller (9) and the agricultural film sample.

5. A light transmittance detection device for agricultural film production according to claim 1, characterized in that: The extrusion assembly comprises: A fixed shell (12) is fixedly connected to the telescopic end of the electric push rod (6); the fixed shell (12) is slidably connected to a sliding column (13); the sliding column (13) passes through the fixed slide rail (7) and the two are fixedly connected; A spring (14) is sleeved on the outside of the sliding column (13), and two ends of the spring (14) are respectively fixedly connected to the fixed shell (12) and the fixed slide rail (7); The squeezing block (15) is fixedly connected to the lower end of the sliding column (13) and is used to pre-fix the agricultural film sample.

6. A light transmittance detection device for agricultural film production according to claim 5, characterized in that: The lower side of the extrusion block (15) is configured to be made of a smooth material, so as to reduce the frictional resistance between the extrusion block (15) and the agricultural film sample.

7. A light transmittance detection device for agricultural film production according to claim 6, characterized in that: The lower side of the squeezing block (15) is flush with the lower side of the squeezing roller (9).

8. A light transmittance detection device for agricultural film production according to claim 7, characterized in that: Also included are: Two sets of resistance adjustment mechanisms, the resistance adjustment mechanisms being arranged between the sliding member (8) and the adjacent connecting shell (10), the resistance adjustment mechanisms comprising: a first connecting block (16), the first connecting block (16) being fixedly connected to one end of the squeezing roller (9) close to the connecting shell (10), the first connecting block (16) being located inside the connecting shell (10), and a connecting rod (17) being spline-connected to a side of the connecting shell (10) away from the squeezing roller (9); a second connecting block (18), fixedly connected to one end of the connecting rod (17) close to the first connecting block (16) and located inside the connecting shell (10), the connecting rod (17) being provided with a thread; A fixing frame (19) is fixedly connected to a side of the connecting shell (10) away from the sliding member (8), the fixing frame (19) being rotatably connected to a threaded sleeve (20), the threaded sleeve (20) being threadedly connected to a thread of the connecting rod (17); A fixed rod (21) is fixedly connected to one side of the threaded sleeve (20); the sliding member (8) is hingedly connected to a hydraulic rod (22) via a mounting seat; a telescopic end of the hydraulic rod (22) is hingedly connected to the fixed rod (21); two elastic oil bags are fixedly connected between the fixed shell (12) and the sliding column (13); the elastic oil bags are filled with hydraulic oil; and the hydraulic rod (22) is connected to the elastic oil bag via an oil guide pipe.

9. A light transmittance detection device for agricultural film production according to claim 8, characterized in that: The first connection block (16) and the second connection block (18) are both composed of magnets distributed at intervals, and a gap is left between the first connection block (16) and the second connection block (18).

10. A light transmittance detection device for agricultural film production according to claim 9, characterized in that: The cross-sectional area of ​​the elastic oil bag is greater than the cross-sectional area of ​​the oil chamber of the hydraulic rod (22).

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