A solar panel surface flatness detection device

Abstract

This invention relates to the field of high-end equipment manufacturing technology and discloses a solar panel surface flatness detection device, including a conveying device, a laser displacement sensor, and a shielding mechanism set at any point above the conveying device for high-strength sealing and light blocking of materials in motion. The shielding mechanism includes a light-shielding cover that is tightly fitted to the surface of the conveyor belt of the conveying device and has an overall "U" shape. Through the cooperation of the inclined edge of the material frame, the blocking strip, the flipping plate, the rotating shaft, the fan-shaped partition, the light-shielding cover, and the corresponding groove, the partition and the blocking strip are fitted and rotated during the movement of the material frame, and the rotating shaft is tightly fitted to the light-blocking groove, forming the first level of light blocking isolation. Utilizing the squeezing linkage between the material frame and the lifting gate, when the material reaches below the laser displacement sensor, the two sets of lifting gates close to form the second level of light blocking isolation, effectively reducing the interference of external stray light on the laser displacement sensor, avoiding detection misjudgment, and improving measurement accuracy and product inspection quality.

Description

Technical Field

[0001] This invention relates to the field of high-end equipment manufacturing technology, and in particular to a device for detecting the flatness of a solar panel surface. Background Technology

[0002] Solar cells are a type of photoelectric conversion device developed based on the photovoltaic effect. Currently, the main types of solar cells on the international photovoltaic market are crystalline silicon thin-film solar cells and copper indium selenide thin-film solar cells. Their production and manufacturing are closely related to the technological upgrading of the high-end equipment manufacturing industry, especially the increasing reliance on precision equipment in core production processes.

[0003] In the manufacturing process of crystalline silicon solar cells, silicon wafers are the most important raw material. The quality inspection of silicon wafers has been gradually incorporated into the application of intelligent manufacturing equipment technology, using automated and precise inspection methods to ensure production efficiency and product quality. After manufacturing, the silicon wafers need to be inspected for surface flatness to guarantee product quality. This is typically done using a laser displacement sensor in a laser measuring instrument. The laser displacement sensor directly scans the object, and the surface flatness curve is obtained by simple calculation based on the displacement value from the sensor to the object.

[0004] When laser displacement sensors detect the flatness of silicon wafers, they are highly susceptible to interference from external stray light and light sources of similar wavelengths. Even with the addition of filters, the limited bandwidth of the filter's spectral transmittance makes it difficult to block all non-target wavelength stray light. Furthermore, multiple diffuse reflections in the complex environment of the workshop can also interfere with the detection by bypassing the filter, leading to misjudgments by the photodetector. The noise-laden light signal causes deviations in the displacement value calculation, resulting in data fluctuations and false peaks and valleys in the silicon wafer flatness curve. Crystalline silicon solar cells have stringent requirements for silicon wafer flatness; even a tiny error can lead to a decrease in the cell's photoelectric conversion efficiency. This not only causes a large number of qualified silicon wafers to be misjudged as defective, increasing production costs, but may also allow unqualified silicon wafers with micro-defects to enter subsequent processes, affecting the power generation performance and lifespan of the solar cells. In addition, dust in the workshop can easily adhere to the surface of the solar panels, forming irregular obstructions that interfere with the laser reflection path, causing distortion of the light signal received by the sensor. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the existing technology has the disadvantage that the laser displacement sensor is easily contaminated by external light sources when detecting the operation of the solar panel, which leads to misjudgment by the photodetector and thus affects the accuracy of the flatness detection of the solar panel, and ultimately affects the power generation efficiency of the solar panel. To this end, we propose a solar panel surface flatness detection device.

[0006] To achieve the above objectives, this application adopts the following technical solution: a solar panel surface flatness detection device, including a conveying device, a laser displacement sensor, and a shielding mechanism set at any point above the conveying device for high-intensity sealing and light shielding of materials in motion; the shielding mechanism includes a light shield that is tightly fitted to the surface of the conveyor belt of the conveying device and has an overall "U" shape. The light shield and the surface of the conveyor belt of the conveying device are tightly fitted to form a double-opening material channel. Two sets of lifting gates are symmetrically slidably inserted on the upper surface of the light shield to isolate a detection chamber with a high-intensity light shielding effect in the material channel. Two sets of flip plates are symmetrically rotated and connected on both sides of the inner wall of the light shield near the opening to further isolate the inlet and outlet preparatory chambers of the light shield; the top two sides of the inner wall of the detection chamber are provided with auxiliary components for auxiliary heat dissipation of the laser displacement sensor and to prevent dust and other small contaminants from entering the inspection chamber; sealing strips are fixed on both outer walls of the light shield, and multiple sets of sealing strips that interlock with the sealing strips are symmetrically fixed on the upper surface of the conveyor belt of the conveying device.

[0007] Preferably, the shielding mechanism further includes light-shielding cavities symmetrically arranged on both sides of the top of the light-shielding cover. The lifting gate slides through the light-shielding cavity. A sealing septum is fixed to the outer wall of the lifting gate, and the sealing septum is slidably connected to the inner wall of the light-shielding cavity. The bottom end of the lifting gate is a single-sided pointed cone, and its inclined surface faces the side closer to the material to be tested.

[0008] Preferably, the conveyor belt surface of the conveying equipment is fixed with multiple sets of material frames at equal intervals. The height of the material frames is slightly higher than the new material to be detected, and the outer wall edges of the material frames are all chamfered with a slope that matches the bottom inclined surface of the lifting gate.

[0009] Preferably, the inner sides of the light shield are rotatably mounted with a rotating shaft near the opening, and both ends of the rotating shaft are fixed with a partition. Both sets of partitions are fan-shaped, and the rotation axis of the partitions coincides with the rotation axis of the rotating shaft. The flip plate, the lower surface of the rotating shaft, and the partitions on both sides are integral structures. The lower surface of the flip plate is fixed with a barrier strip, and a matching light-blocking groove is provided at the contact position between the top of the inner wall of the light shield and the rotating shaft.

[0010] Preferably, the inner wall of the light shield has matching rotating grooves at the contact points with the partition, and the rotating grooves extend upward to the upper surface of the light shield. The inner wall of the light shield has arc-shaped grooves at the contact points with the barrier strip, and the arc-shaped grooves coincide with the rotating grooves and the rotation axis of the rotating shaft. The partition has a double-layer stepped structure.

[0011] Preferably, the auxiliary component includes an air intake duct on one side above the examination chamber and an exhaust duct on the other side. The cross-sectional shape of the inner cavity of the air intake duct and the exhaust duct is C-shaped, and a filter plate is inserted obliquely above the air intake duct.

[0012] Preferably, two sets of filter screens with different mesh sizes are embedded in the surface of the filter plate, wherein the mesh size of the filter screen located above the filter plate is larger than that of the filter screen below, and a gripping hole is provided at the top of the filter plate.

[0013] Preferably, a set of connecting sleeves is installed at the top opening of the air intake channel, and an air intake device is connected to the outside of the set of connecting sleeves. The exhaust channel is connected to the inner cavity of a set of light-shielding chambers. Another set of connecting sleeves is installed at the top opening of the air intake channel, and an exhaust device is connected to the outside of the set of connecting sleeves.

[0014] Preferably, two sets of skylights for operator maintenance are symmetrically provided on the upper part of the light shield. The upper surface of the light shield and on both sides of the laser displacement sensor are hinged with flip covers. The lower end of the flip cover is an inverted four-sided frustum shape, and the lower end of the flip cover is embedded in the skylight and fits tightly.

[0015] Preferably, multiple sets of support rods are symmetrically fixed to the outer walls of both sides of the light shield, and multiple sets of L-braces are symmetrically fixed to the outer walls of both side guard plates of the conveying equipment. Each set of L-braces has an elastic element sleeved on its outer wall, and the support rod is slidably sleeved on the outer wall of the L-braces. The two ends of the elastic element are in contact with the lower surface of the support rod and the upper surface of the L-braces, respectively. A limiting element is installed on the top outer wall of the L-braces, and the upper surface of the support rod is in contact with the lower surface of the limiting element.

[0016] The technical effects and advantages of this invention are as follows:

[0017] 1. In this invention, through the cooperation of the inclined edge of the material frame, the barrier strip, the flip plate, the rotating shaft, the fan-shaped partition, the light shield and the corresponding groove, the partition and the barrier strip are made to fit and rotate during the movement of the material frame, and the rotating shaft is tightly attached to the light-blocking groove to form the first level of light-blocking isolation; then, by utilizing the squeezing linkage between the material frame and the lifting gate, when the material reaches below the laser displacement sensor, the two sets of lifting gates close to form the second level of light-blocking isolation, which effectively reduces the interference of external stray light on the laser displacement sensor, avoids detection misjudgment, and improves measurement accuracy and product detection quality.

[0018] 2. In this invention, through the coordinated operation of the air inlet channel, exhaust channel, lifting gate, and sealing partition in the detection chamber, when the old material frame squeezes the lifting gate on the side of the exhaust channel, the detection chamber forms a single-pass structure. The blower fills the chamber with cooling airflow, which generates high air pressure inside the chamber. The airflow carries heat and dust and other contaminants from the detection chamber and discharges them through the material preparation chamber, achieving simultaneous heat dissipation and dust removal, reducing the risk of dust adhering to the surface of the material, and further improving the flatness detection accuracy of solar panels. Attached Figure Description

[0019] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0020] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0021] Figure 2 This is a cross-sectional view of the light shield and some components of the present invention;

[0022] Figure 3 This is a side view of the device structure of the present invention;

[0023] Figure 4 This is a cross-sectional view of the device detection chamber under sealed conditions according to the present invention;

[0024] Figure 5 This is a schematic diagram and a detailed enlarged view of the cross-sectional structure of the detection chamber of the device of the present invention in an unsealed state;

[0025] Figure 6 This is a schematic diagram of the shielding mechanism of the present invention;

[0026] Figure 7 This is a cross-sectional schematic diagram of the shielding mechanism of the present invention;

[0027] Figure 8 This is a cross-sectional schematic diagram of the shielding mechanism of the present invention;

[0028] Figure 9 For the present invention Figure 8 Enlarged schematic diagram of the structure at point A in the middle.

[0029] Legend: 1. Conveying equipment; 11. Sealing strip; 12. Material frame; 13. L-bracket; 2. Light shield; 21. Light shielding cavity; 22. Air inlet duct; 23. Exhaust duct; 24. Rotary trough; 241. Arc-shaped partition; 25. Light blocking groove;

[0030] 3. Lifting gate; 31. Sealing diaphragm; 32. Rotating shaft; 33. Partition plate; 34. Tilting plate; 35. Barrier strip;

[0031] 4. Support rod; 41. Elastic element; 42. Sealing strip; 43. Laser displacement sensor; 44. Flip cover; 45. Filter plate; 46. Connecting sleeve. Detailed Implementation

[0032] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0033] Reference Figure 1-9 As shown, the present invention provides a technical solution: a solar panel surface flatness detection device, including a conveying device 1, a laser displacement sensor 43, and a shielding mechanism disposed at any point above the conveying device 1 for high-intensity sealing and light shielding of materials in motion; the shielding mechanism includes a light shield 2 that is tightly fitted to the surface of the conveyor belt of the conveying device 1 and has an overall "U" shape. The light shield 2 and the surface of the conveyor belt of the conveying device 1 are tightly fitted to form a double-opening material channel. Two sets of materials for slidably sliding through the upper surface of the light shield 2 are used in the material channel. A lifting gate 3 isolates a detection chamber with a high-intensity light-shielding effect. Two sets of flip plates 34 are symmetrically rotated and connected on both sides of the inner wall of the light shield 2 near the opening, which further isolate the feeding and discharging preparation chambers. The top two sides of the inner wall of the detection chamber are provided with auxiliary components for heat dissipation of the laser displacement sensor 43 and to prevent dust and other small contaminants from entering the inspection chamber. Sealing strips 42 are fixed on both outer walls of the light shield 2. Multiple sets of sealing strips 11 that interlock with the sealing strips 42 are symmetrically fixed on the upper surface of the conveyor belt of the conveying device 1.

[0034] Reference Figure 4-9 As shown in this embodiment: the shielding mechanism also includes light-shielding cavities 21 symmetrically arranged on both sides of the top of the light-shielding cover 2. The lifting gate 3 slides through the light-shielding cavity 21. A sealing partition 31 is fixed on the outer wall of the lifting gate 3, and the sealing partition 31 is slidably connected to the inner wall of the light-shielding cavity 21. The tight fit between the light-shielding cavity 21 and the sealing partition 31 further reduces the possibility of external interference light sources entering. The bottom end of the lifting gate 3 is a single-sided pointed cone, and its inclined surface faces the side closer to the material to be tested.

[0035] Reference Figure 1-5 As shown in this embodiment: multiple sets of material frames 12 are fixed at equal intervals on the surface of the conveyor belt of the conveying equipment 1. The height of the material frame 12 is slightly higher than the new material to be tested. The outer wall edge of the material frame 12 is chamfered with a slope that matches the bottom inclined surface of the lifting gate 3.

[0036] Reference Figure 6-9As shown in this embodiment: a rotating shaft 32 is rotatably installed on both sides of the interior of the light shield 2 near the opening. A partition 33 is fixed at both ends of the rotating shaft 32. Both sets of partitions 33 are fan-shaped, and the rotation axis of the partition 33 coincides with the rotation axis of the rotating shaft 32. The flip plate 34 is an integral structure with the lower surface of the rotating shaft 32 and the partitions 33 on both sides. A barrier strip 35 is fixed on the lower surface of the flip plate 34, and a matching light-blocking groove 25 is opened at the contact position between the top of the inner wall of the light shield 2 and the rotating shaft 32.

[0037] Reference Figure 6-9 As shown in this embodiment: matching rotating grooves 24 are provided on both sides of the inner wall of the light shield 2 at the contact position with the partition 33, and the rotating grooves 24 extend upward to the upper surface of the light shield 2. Arc-shaped partitions 241 are provided at the contact position between the inner wall of the light shield 2 and the barrier strip 35, and the arc-shaped partitions 241 coincide with the rotating grooves 24 and the rotation axis of the rotating shaft 32. The partition 33 has a double-layer stepped structure.

[0038] Reference Figure 4-9 As shown, in this embodiment, the auxiliary components include an air intake duct 22 located on one side above the inspection chamber and an exhaust duct 23 on the other side. The cross-sectional shape of the inner cavity of the air intake duct 22 and the exhaust duct 23 is similar to the letter "C", and a filter plate 45 is inserted obliquely above the air intake duct 22.

[0039] Reference Figure 4-9 As shown in this embodiment, two sets of filter screens with different mesh sizes are embedded in the surface of the filter plate 45, wherein the mesh size of the filter screen located above the filter plate 45 is larger than that of the filter screen below, and a gripping hole is provided at the top of the filter plate 45.

[0040] Reference Figure 4-9 As shown in this embodiment: a set of connecting sleeves 46 is installed at the top opening of the air intake duct 22, and an air intake device is connected to the outside of the set of connecting sleeves 46; the exhaust duct 23 is connected to the inner cavity of a set of light-shielding chambers 21; another set of connecting sleeves 46 is installed at the top opening of the air intake duct 22, and an exhaust device is connected to the outside of the set of connecting sleeves 46.

[0041] Reference Figure 1-9 As shown in this embodiment: two sets of skylights for operator maintenance are symmetrically opened above the light shield 2. A flip cover 44 is hinged on the upper surface of the light shield 2 and on both sides of the laser displacement sensor 43. The lower end of the flip cover 44 is an inverted four-sided frustum shape, and the lower end of the flip cover 44 is embedded in the skylight and fits tightly.

[0042] Reference Figure 1-9As shown in this embodiment: multiple sets of support rods 4 are symmetrically fixed on both outer walls of the light shield 2, and multiple sets of L brackets 13 are symmetrically fixed on both outer walls of the protective plates on both sides of the conveying device 1. Each set of L brackets 13 has an elastic element 41 sleeved on its outer wall, and the support rod 4 is slidably sleeved on the outer wall of the L bracket 13. The two ends of the elastic element 41 are in contact with the lower surface of the support rod 4 and the upper surface of the L bracket 13, respectively. A limiting element is installed on the top outer wall of the L bracket 13, and the upper surface of the support rod 4 is in contact with the lower surface of the limiting element.

[0043] Working principle: First, the moving material frame 12 continuously carries the new material to be tested closer to the feeding preparation chamber (the new material is the solar panel, and the new material is placed inside the material frame 12. The height of the inner wall of the material frame 12 is higher than the thickness of the new material, and the volume of the inner wall of the material frame 12 is greater than the volume of the new material). The inclined surface of the edge of the moving material frame 12 squeezes the blocking strip 35 and the flipping plate 34. At this time, the rotating shaft 32, the flipping plate 34, and the fan-shaped partition 33 are all rotated under pressure. When the material frame 12 and the blocking strip 35 are completely separated, the gravity of the fan-shaped partition 33 drives the flipping plate 34 to automatically rotate and reset.

[0044] Part of the surface of the partition 33 rotates to the upper surface of the light shield 2, while the double-layer stepped partition 33 and the barrier strip 35 are fitted and rotated in the rotating groove 24 and the arc-shaped partition groove 241 (the inner wall shape of the rotating groove 24 matches the outer wall shape of the partition 33). At the same time, the rotating shaft 32 is in close contact with the light-blocking groove 25 opened at the top of the inner wall of the light shield 2. Finally, the first-level light-blocking isolation of the material to be tested is formed by the cooperation of the flip plate 34, the rotating shaft 32 and the light-blocking groove 25, the barrier strip 35 and the arc-shaped partition groove 241, and the partition 33 and the rotating groove 24.

[0045] The new material continues to move forward, and then the material frame 12 in the moving state contacts the bottom of the lifting gate 3. The inclined surface at the edge of the material frame 12 presses against the inclined surface at the bottom of the lifting gate 3, causing the lifting gate 3 to move upward and open the detection chamber. (Note that when the new material has completely moved into the detection chamber, part of the old material and material frame 12 that have already completed the straightness detection by the laser displacement sensor 43 are still inside the detection chamber; that is, the lifting gate 3 located below the air inlet duct is in the closed state, while the lifting gate 3 on the other side is in the open state.) When one side of the new material moves... When the laser displacement sensor 43 is in the lower position, both sets of lifting gates 3 are in the closed state. The two sets of lifting gates 3 form a second level of light blocking isolation for the material to be tested. These two levels of light blocking isolation greatly reduce the possibility of external light sources entering the detection cavity, reduce the interference of external stray light on the detection of the laser displacement sensor 43, reduce the possibility of misjudgment at the sensor receiver and the deviation of displacement value calculation, effectively ensure the accuracy of silicon wafer surface flatness measurement data, avoid misjudgment of qualified solar panels and missed detection of unqualified products due to measurement errors, and improve detection efficiency and product quality to a certain extent.

[0046] The lateral span value within the detection chamber is slightly greater than three times the spacing between the two sets of material frames;

[0047] When the old material frame 12, after passing the straightness test, moves upwards against the lifting gate 3 near the exhaust duct 23 (the lifting gate 3 near the air inlet duct needs to be completely closed, but the new material is still moving upwards to the laser displacement sensor 43 for straightness testing), the detection chamber forms a single-pass structure (the air inlet duct continuously injects cooling airflow into the detection chamber through the external blower sleeve 46, while the lifting gate 3 near the exhaust duct 23 moves upwards against the old material frame 12, and the sealing partition 31 fixed on its outer wall blocks the connection port of the exhaust duct 23). (At this point, the exhaust equipment stops.) Finally, the blower continuously delivers airflow into the detection chamber through the connecting sleeve 46 and the air inlet duct. The inside of the detection chamber will be in a high-pressure state for a short time (compared to the double-pass state). The high pressure will automatically move along the material discharge preparation chamber at this time. When the airflow flows, it will carry the heat emitted by the laser displacement sensor 43 in the detection chamber and spray out small contaminants such as dust brought in by the new material. On the one hand, it reduces the temperature in the detection chamber, and on the other hand, it removes small contaminants such as dust, which reduces the possibility of dust adhering to the surface of the new material to a certain extent, and indirectly improves the flatness detection accuracy of the solar panel.

[0048] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A device for detecting the flatness of a solar panel surface, characterized in that, It includes conveying equipment, laser displacement sensor, and a shielding mechanism set at any point above the conveying equipment to provide high-strength sealing and light shielding for the material in motion. The shielding mechanism includes a light shield that is tightly fitted to the surface of the conveyor belt of the conveying equipment and has an overall "U" shape. The light shield and the surface of the conveyor belt of the conveying equipment are tightly fitted to form a double-opening material channel. Two sets of lifting gates are symmetrically slidably inserted on the upper surface of the light shield to isolate a detection chamber with a high light shielding effect in the material channel. Two sets of flip plates are symmetrically rotated and connected on both sides of the inner wall of the light shield near the opening to further isolate the feeding and discharging preparation chambers. The top two sides of the inner wall of the detection chamber are equipped with auxiliary components for heat dissipation of the laser displacement sensor and to prevent dust and other small contaminants from entering the inspection chamber. Both outer walls of the light shield are fixed with sealing strips, and multiple sets of sealing strips that interlock with the sealing strips are symmetrically fixed on the upper surface of the conveyor belt of the conveying equipment. The shielding mechanism also includes light-shielding cavities symmetrically arranged on both sides of the top of the light-shielding cover. The lifting gate slides through the light-shielding cavity. A sealing septum is fixed on the outer wall of the lifting gate, and the sealing septum is slidably connected to the inner wall of the light-shielding cavity. The bottom end of the lifting gate is a single-sided pointed cone, and its inclined surface faces the side closer to the material to be tested. The light shield has rotating shafts mounted on both sides of the interior near the opening. Each end of the rotating shaft is fixed with a partition. Both partitions are fan-shaped, and the rotation axis of the partitions coincides with the rotation axis of the rotating shaft. The flip plate, the lower surface of the rotating shaft, and the partitions on both sides are integral structures. The lower surface of the flip plate is fixed with a barrier strip, and a matching light-blocking groove is provided at the contact position between the top of the inner wall of the light shield and the rotating shaft. The inner wall of the light shield has matching rotating grooves on both sides where it contacts the partition, and the rotating grooves extend upward to the upper surface of the light shield. The inner wall of the light shield has arc-shaped grooves at the contact points with the barrier strip, and the arc-shaped grooves coincide with the rotating grooves and the rotation axis of the rotating shaft. The partition has a double-layer stepped structure. The auxiliary components include an air intake duct on one side above the examination chamber and an exhaust duct on the other side. The cross-sectional shape of the inner cavity of the air intake duct and the exhaust duct is similar to the letter "C", and a filter plate is inserted obliquely above the air intake duct. The filter plate has two sets of filter screens with different mesh sizes embedded in its surface. The mesh size of the filter screen located on the upper part of the filter plate is larger than that of the filter screen located on the lower part. A gripping hole is provided at the top of the filter plate.

2. The solar panel surface flatness detection device according to claim 1, characterized in that: Multiple sets of material frames are fixed at equal intervals on the surface of the conveyor belt of the conveying equipment. The height of the material frames is slightly higher than the new material to be detected. The outer edge of the material frames is chamfered with a slope that matches the bottom inclined surface of the lifting gate.

3. The solar panel surface flatness detection device according to claim 1, characterized in that: The top opening of the air intake duct is connected to a set of connecting sleeves, and the air intake device is connected to the outside of the connecting sleeves. The exhaust duct is connected to the inner cavity of a set of light-shielding chambers. The top opening of the air intake duct is connected to another set of connecting sleeves, and the exhaust device is connected to the outside of the connecting sleeves.

4. The solar panel surface flatness detection device according to claim 1, characterized in that: Two sets of skylights for operator maintenance are symmetrically opened on the top of the sunshade. The upper surface of the sunshade and on both sides of the laser displacement sensor are hinged with flip covers. The lower end of the flip cover is an inverted four-sided frustum shape, and the lower end of the flip cover is embedded in the skylight and fits tightly.

5. The solar panel surface flatness detection device according to claim 1, characterized in that: Multiple sets of support rods are symmetrically fixed to the outer walls of both sides of the light shield, and multiple sets of L-shaped brackets are symmetrically fixed to the outer walls of both side guard plates of the conveying equipment. Each set of L-shaped brackets has an elastic element fitted on its outer wall, and the support rod is slidably fitted on the outer wall of the L-shaped bracket. The two ends of the elastic element are in contact with the lower surface of the support rod and the upper surface of the L-shaped bracket, respectively. A limiting element is installed on the top outer wall of the L-shaped bracket, and the upper surface of the support rod is in contact with the lower surface of the limiting element.

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